CN110554544B - Micro Switch Electronic Writing Pad - Google Patents

Abstract

The invention discloses a micro-switch electronic writing board, which comprises a micro-switch array module and a cholesterol liquid crystal module. The micro-switch array module is provided with a plurality of micro-switch units, and the transparent conducting layer of each micro-switch unit is arranged on the surface of the first light-transmitting substrate, which is back to the light incident surface. The first transparent electrode layer is disposed on the first surface of the second transparent substrate and extends to the second surface of the second transparent substrate through the conductive hole. A second transparent electrode layer is arranged on one surface of the first substrate of the first cholesterol liquid crystal module. The micro-switch array module is mutually overlapped with the first cholesterol liquid crystal module through the second transparent substrate, so that the first cholesterol liquid crystal layer is arranged between the first substrate and the second transparent substrate. The microswitch electronic writing board has the advantages of simple and convenient manufacturing process and low manufacturing cost, and simultaneously has the function of detecting the writing position or the wiping position.

Description

Micro switch electronic writing board

technical field

The invention relates to a micro-switch electronic writing board, in particular to a micro-switch electronic writing board capable of detecting writing or wiping positions.

Background technique

Cholesteric liquid crystal (Cholesteric liquid crystal) is to add a chiral dopant to the nematic liquid crystal to make it have a helical arrangement structure, and use two different liquid crystal molecules of reflection and penetration under different voltage differences. Arrangement states to achieve different light transmittance, to achieve the display effect. Among them, in the planar state, the incident light will be reflected and colored; in the focal conic state, most of the incident light will be transmitted, and a small part will be scattered; and in the vertical state, the incident light will be completely penetrated.

Since the cholesteric liquid crystal is in a stable state when it is in the planar state and the focal conic state, when the voltage is turned off and disappears, it will still maintain the original state and display screen. Applied voltage, this low power consumption and memory characteristics also make cholesteric liquid crystal the first choice for e-books. At the same time, this display mechanism is less affected by the distance between the upper and lower plates, and has the potential and application to develop into a bistable flexible display. Compared with other types, such as TN-type liquid crystal display, cholesteric liquid crystal display has the advantages of power saving, color display, dimmable light and can be applied to bistable flexible display, etc., and is widely used.

At present, most of the cholesteric liquid crystal writing boards are transformed by pressing with physical force. However, when this kind of cholesteric liquid crystal writing board needs to detect the writing position or perform partial wiping, it needs to additionally configure corresponding position sensing elements on the array substrate of its liquid crystal module. However, since the position sensing elements are to be disposed on the array substrate, many semiconductor photomask manufacturing processes are required. That is to say, in the current cholesteric liquid crystal tablet with position detection function, the structure of the element responsible for position sensing is relatively complex, so the manufacturing cost is relatively increased. Moreover, the yield rate is low due to the additional steps of the semiconductor manufacturing process.

Based on the above, how to provide a cholesteric liquid crystal writing board that eliminates the semiconductor manufacturing process to reduce the manufacturing cost and has the function of detecting the writing position or the wiping position is an important issue.

Contents of the invention

The object of the present invention is to provide a micro-switch electronic writing board, which not only has the effect of simple structure and low cost, but also has the function of detecting writing position or wiping position.

The invention provides a micro-switch electronic writing board, which includes a micro-switch array module and a cholesteric liquid crystal module. The micro-switch array module has a plurality of micro-switch units arranged in an array, and each micro-switch unit includes a first light-transmitting substrate, a transparent conductive layer, a second light-transmitting substrate, a first transparent electrode layer and at least one spacer . The first transparent substrate has a light incident surface. The transparent conductive layer is disposed on the surface of the first transparent substrate facing away from the light incident surface. The second transparent substrate has a first surface facing the transparent conductive layer and a second surface opposite to the first surface, and the second transparent substrate has a conductive hole penetrating through the first surface and the second surface. The first transparent electrode layer is disposed on the first surface of the second transparent substrate, and extends to the second surface of the second transparent substrate through the conductive hole. The spacer is disposed between the first transparent substrate and the second transparent substrate. The first cholesteric liquid crystal module includes a first substrate and a first cholesteric liquid crystal layer. One surface of the first substrate is provided with a second transparent electrode layer. The first cholesteric liquid crystal layer is disposed on the second transparent electrode layer. Wherein, the micro switch array module is stacked with the first cholesteric liquid crystal module through the second transparent substrate, so that the first cholesteric liquid crystal layer is interposed between the first substrate and the second transparent substrate.

In one embodiment, the other surface of the first substrate of the first cholesteric liquid crystal module is provided with a third transparent electrode layer arranged at intervals.

In one embodiment, the third transparent electrode layer is electrically connected to the first transparent electrode layer.

In one embodiment, the micro-switch electronic writing board further includes a second cholesteric liquid crystal module, and the second cholesteric liquid crystal module includes a second substrate and a second cholesteric liquid crystal layer. One surface of the second substrate is provided with a fourth transparent electrode layer. The second cholesteric liquid crystal layer is disposed on the fourth transparent electrode layer; wherein, the second cholesteric liquid crystal module is overlapped with the first cholesteric liquid crystal module through the first substrate, so that the second cholesteric liquid crystal layer is interposed between the first substrate and the second substrate.

In one embodiment, the micro-switch electronic writing board further includes a second cholesteric liquid crystal module, and the second cholesteric liquid crystal module includes a second substrate, a second cholesteric liquid crystal layer and a third light-transmitting substrate. One surface of the second substrate is provided with a fourth transparent electrode layer. The second cholesteric liquid crystal layer is disposed on the fourth transparent electrode layer. The third light-transmitting substrate is arranged on the second cholesteric liquid crystal layer, and a surface facing the second cholesteric liquid crystal layer is provided with a fifth transparent electrode layer arranged at intervals, wherein the second cholesteric liquid crystal module passes through the first substrate and the second cholesteric liquid crystal module. The three light-transmitting substrates are stacked with the first cholesteric liquid crystal module.

In one embodiment, the fifth transparent electrode layer is electrically connected to the first transparent electrode layer.

In one embodiment, the material of the first transparent substrate, the second transparent substrate, or the first substrate is plastic or glass.

In one embodiment, the material of the second substrate is plastic or glass.

In one embodiment, the material of the second substrate or the third transparent substrate is plastic or glass.

In one embodiment, the first transparent substrate is a glass substrate, and the thickness of the glass substrate is between 0.1 mm and 0.35 mm.

In one embodiment, the material of the transparent conductive layer, the first transparent electrode layer, or the second transparent electrode layer is a transparent conductive material or graphene.

In one embodiment, the material of the third transparent electrode layer or the fourth transparent electrode layer is a transparent conductive material or graphene.

In one embodiment, the material of the third transparent electrode layer, or the fourth transparent electrode layer, or the fifth transparent electrode layer is a transparent conductive material or graphene.

In one embodiment, the micro-switch electronic writing board further includes a voltage control circuit, which is electrically connected to the transparent conductive layer and the second transparent electrode layer respectively.

In one embodiment, the micro-switch electronic writing board further includes a voltage control circuit, which is electrically connected to the transparent conductive layer, the second transparent electrode layer and the fourth transparent electrode layer respectively.

As mentioned above, the micro-switch electronic writing board of the present invention includes a micro-switch array module and a cholesteric liquid crystal module. The micro-switch array module has a plurality of micro-switch units configured in an array. The transparent conductive layer of each micro-switch unit is arranged on the surface of the first light-transmitting substrate facing away from the light incident surface, and the first transparent electrode layer is arranged on the second light-transmitting substrate. and extended to the second surface of the second light-transmitting substrate through conductive holes; wherein, the micro-switch array module is stacked with the cholesteric liquid crystal module through the second light-transmitting substrate, so that the cholesteric liquid crystal The layer is between the first substrate and the second transparent substrate. In this way, since the structure of the micro-switch array module and the cholesteric liquid crystal module is quite simple, the manufacturing cost is not high; and after the micro-switch array module and the cholesteric liquid crystal module are superimposed on each other, it can be made into a device capable of detecting the writing position or wiping. The micro-switch electronic writing board with position function, the process is also quite simple. Therefore, the micro-switch electronic writing board of the present invention has the advantages of simple manufacturing process and low manufacturing cost, and simultaneously has the function of detecting writing position or wiping position.

Description of drawings

FIG. 1 is a schematic diagram of the application of a micro-switch electronic writing board according to an embodiment of the present invention.

FIG. 2 is a partially exploded perspective view of an embodiment of the micro-switch electronic writing board of the present invention.

FIG. 3A is an exploded cross-sectional view of an embodiment of the micro-switch electronic writing board shown in FIG. 2 along the line A-A.

FIG. 3B is a schematic structural view of the micro-switch electronic writing board shown in FIG. 3A after being assembled and pressed.

FIG. 3C is a schematic structural view of the micro-switch electronic writing board shown in FIG. 3A or FIG. 3B provided with a backplane.

4A and 4B are structural schematic diagrams of another embodiment of the micro-switch electronic writing board provided by the present invention.

5A and 5B are structural schematic diagrams of yet another embodiment of the micro-switch electronic writing board provided by the present invention.

Detailed ways

The micro-switch electronic writing board according to various embodiments of the present invention will be described below with reference to related drawings, wherein the same elements will be described with the same reference symbols.

It should be noted that all directional indications (such as up, down, left, right, front, back...) in the various embodiments of the present invention are only used to explain the direction in a certain posture (as shown in the accompanying drawings). ) under the relative positional relationship, movement conditions, etc. between the various components, if the specific posture changes, the directional indication will also change accordingly.

The micro-switch electronic writing board in the following embodiments is an example of a large-size electronic blackboard (or whiteboard) used in interactive writing systems such as conferences or teaching, but the present invention is not limited thereto. The micro-switch electronic writing board provided by each embodiment of the present invention utilizes the characteristics of cholesteric liquid crystals, so it is a bistable display device. When the micro-switch electronic writing board displays images or pictures, no input is required. With extra power, the image or picture will always be kept, and only when changing to another state or displaying a picture does it need to input extra power, so the micro-switch electronic tablet is a very power-saving electronic device.

The micro-switch electronic writing board provided by the following embodiments of the present invention utilizes the characteristics of cholesteric liquid crystals, so it is a bistable display device. When the micro-switch electronic writing board displays images or pictures, no additional input is required. The image or picture will always be kept, and only when changing to another state or displaying a picture does it need to input additional power. Therefore, the micro-switch electronic writing board is a low-cost and power-saving electronic device.

FIG. 1 is a schematic diagram of the application of a micro-switch electronic writing board according to an embodiment of the present invention. Fig. 2 is a partial three-dimensional exploded schematic diagram of an embodiment of the micro-switch electronic writing board of the present invention, Fig. 3A is a cross-sectional exploded schematic diagram of an embodiment of the micro-switch electronic writing board shown in Fig. 2 along the line A-A, and Fig. 3B is a diagram Schematic diagram of the structure of the micro-switch electronic writing board shown in 3A when it is assembled and pressed. The micro-switch electronic writing board of the present invention is, for example but not limited to, a mobile phone, a tablet, or an electronic whiteboard, or other display devices capable of displaying images. As shown in FIG. 1 , the micro-switch electronic writing board E of this embodiment is an example of a large-size electronic blackboard (or whiteboard) used in conference or teaching systems, but the present invention is not limited thereto. It is particularly worth mentioning that, for the convenience of description, the micro-switch electronic writing board E of the following embodiments has different compositions according to different embodiments. The micro-switch electronic writing board E shown in FIG. 1 displays a writing track T on its light incident surface 111 .

As shown in FIG. 2 , the micro-switch electronic writing board E of this embodiment includes a micro-switch array module 1 and a first cholesteric liquid crystal module 2 . The micro-switch array module 1 has a plurality of micro-switch units 10 configured in a two-dimensional array, but the present invention is not limited to the two-dimensional array.

As shown in FIG. 3A , each microswitch unit 10 includes a first transparent substrate 11 , a transparent conductive layer 12 , a second transparent substrate 13 , a first transparent electrode layer 14 and at least one spacer 15 .

The first transparent substrate 11 has a light incident surface 111 . The light incident surface 111 of this embodiment is the upper surface of the first light-transmitting substrate 11, and is also the surface of the micro-switch electronic writing board E facing the user. It can also be called the writing surface or the display surface, and the user can write on it. To generate the writing track T. It should be noted that the user can directly write (press) on the light incident surface (writing surface) 111 to generate the writing track T; or, other film layers can also be provided on the light incident surface 111, and the user can write on this film Writing (pressing) on the layer produces a writing track T. In some embodiments, a protective film layer or a protective substrate can be further provided on the light incident surface 111 to protect the electronic writing board E with micro switches.

In each micro switch unit 10 , the transparent conductive layer 12 is disposed on the surface 112 of the first transparent substrate 11 facing away from the light incident surface 111 . Herein, the surface 112 is another surface of the first transparent substrate 11 . The second transparent substrate 13 has a first surface 131 facing the transparent conductive layer 12 and a second surface 132 opposite to the first surface 131, and the second transparent substrate 13 has a structure extending through the first surface 131 and the second surface 132. A conductive hole 133 . As the name implies, the purpose of the conductive hole 133 is for electrical conduction. In this embodiment, if the second light-transmitting substrate 13 is made of glass, a laser can be used to open holes on the second light-transmitting substrate 13; if the second light-transmitting substrate 13 is made of plastic, an etching process can be used. Holes are opened to obtain conductive holes 133 passing through the first surface 131 and the second surface 132 . The first transparent electrode layer 14 is disposed on the first surface 131 of the second light-transmitting substrate 13 , and extends to the second surface 132 of the second light-transmitting substrate 13 through the conductive hole 133 , so as to be formed on the second surface 132 as well. The first transparent electrode layers 14 arranged at intervals are formed. Here, in each micro switch unit 10 , the transparent conductive layer 12 , the conductive hole 133 and the first transparent electrode layer 14 are in a one-to-one correspondence. In addition, at least one spacer 15 is disposed between the first transparent substrate 11 and the second transparent substrate 13, so that there is a gap between the first transparent substrate 11 and the second transparent substrate 13, so that the transparent conductive layer 12 There is a gap between the first transparent electrode layer 14 and the first transparent electrode layer 14 on the first surface 131 of the second transparent substrate 13 . Specifically, the spacer 15 of this embodiment is disposed on the outside of the micro-switch unit 10 , so that there is a gap between the transparent conductive layer 12 and the first transparent electrode layer 14 , thereby forming the micro-switch unit 10 . In different embodiments, the spacer 15 can also be disposed inside the transparent conductive layer 12 and the first transparent electrode layer 14 .

Also as shown in FIG. 3A , the first cholesteric liquid crystal module 2 includes a first substrate 21 , a second transparent electrode layer 22 and a first cholesteric liquid crystal layer 23 . The second transparent electrode layer 22 is disposed on the surface of the first substrate 21 facing the first cholesteric liquid crystal layer 23 . Here, the second transparent electrode layer 22 can be fully disposed on the surface 211 of the first substrate 21 facing the first cholesteric liquid crystal layer 23, and the first cholesteric liquid crystal layer 23 is disposed on the second transparent electrode layer 22 and located Between the second transparent electrode layer 22 and the first transparent electrode layer 14 . The aforementioned “comprehensiveness” means that the second transparent electrode layer 22 includes a common electrode on the entire surface, and the common electrode covers most of the surface of the first substrate 21 facing the first cholesteric liquid crystal layer 23 . In different embodiments, the second transparent electrode layer 22 may be disposed at intervals on the surface of the first substrate 21 facing the first cholesteric liquid crystal layer 23 , which is not limited by the present invention.

As shown in FIG. 3B , the microswitch array module 1 of this embodiment is stacked with the first cholesteric liquid crystal module 2 through the second light-transmitting substrate 13 , so that the first cholesteric liquid crystal layer 23 is interposed between the first substrate 21 and the second transparent substrate 13 . In some embodiments, the micro-switch array module 1 and the first cholesteric liquid crystal module 2 can be adhered with adhesive material to enhance the stability of the structure. When the transparent conductive layer 12 is pressed down to the first transparent electrode layer 14 and contacts the first transparent electrode layer 14, the micro-switch unit 10 is turned on, and the electrical signal can pass through the transparent conductive layer 12 of the micro-switch unit 10. transmitted to the first transparent electrode layer 14 , and then transmitted to the first transparent electrode layer 14 on the second surface 132 of the second transparent substrate 13 through the conductive hole 133 .

In FIG. 3B , the second transparent substrate 13 is disposed opposite to the first substrate 21 . The first cholesteric liquid crystal layer 23 has a plurality of cholesteric liquid crystal molecules (not shown), which can be filled and disposed between the second transparent substrate 13 and the first substrate 21 . In addition, the micro-switch electronic writing board E can further include a sealing layer (not shown), the sealing layer can be a sealant, and is arranged between the second light-transmitting substrate 13 and the first substrate 21 to seal the second light-transmitting substrate 13 and the first substrate 21. The outer periphery of the substrate 13 and the first substrate 21 makes a gap between the second transparent substrate 13 and the first substrate 21 . An accommodating space can be formed by the second transparent substrate 13 , the first substrate 21 and the sealing layer, so that the cholesteric liquid crystal molecules can be filled in the accommodating space to form the first cholesteric liquid crystal layer 23 . The first cholesteric liquid crystal layer 23 in this embodiment includes a plurality of liquid crystal control regions 231 , and each liquid crystal control region 231 is set corresponding to each micro switch unit 10 . In other words, the range of each liquid crystal control area 231 is defined by each micro switch unit 10 , and the cholesteric liquid crystal molecules in the corresponding liquid crystal control area 231 can be controlled by the micro switch unit 10 . When the voltage signal is transmitted between the corresponding first transparent electrode layer 14 and the second transparent electrode layer 22 of the micro-switch unit 10 and a voltage difference is formed to generate an electric field, the cholesteric liquid crystal molecules in the corresponding liquid crystal control area 231 can be controlled to rotate. The material of the transparent conductive layer 12 , the first transparent electrode layer 14 or the second transparent electrode layer 22 in this embodiment may be a transparent conductive material (such as ITO or IZO) or graphene, and is not limited.

In this embodiment, the first light-transmitting substrate 11 is a flexible light-transmitting substrate, and the first light-transmitting substrate 11 and the second light-transmitting substrate 13 are respectively light-transmitting substrates, but the first substrate 21 is a light-reflecting substrate Or light-absorbing substrates that either reflect or absorb incoming light. In addition, the materials of the first transparent substrate 11 , the second transparent substrate 13 , or the first substrate 21 can be plastic or glass respectively. When the first transparent substrate 11 is a glass substrate, its thickness may be between 0.1 mm and 0.35 mm (0.1 mm≦d≦0.35 mm), so that the first transparent substrate 11 has a bendable property. Specifically, generally thicker glass substrates (for example, 0.5 mm to 1.5 mm) have higher hardness and are difficult to be bent or deformed by pressing, but if the thickness of the first transparent substrate 11 is only between 0.1 mm and 0.35 mm If the glass is made of high-quality glass, it can exhibit flexible characteristics and have functions of pressing and writing. In some embodiments, the first light-transmitting substrate 11 can be ground and thinned to a thickness between 0.1 mm and 0.35 mm, for example but not limited to, by using a chemical mechanical planarization (CMP) manufacturing process. In some embodiments, if the second transparent substrate 13 and the first substrate 21 are also flexible, the micro-switch electronic writing board E can be made into a curved writing board or a display.

The first cholesteric liquid crystal module 2 can display a corresponding color. Specifically, the micro-switch electronic writing board E can be prepared by adding different contents of optical active agents in the first cholesteric liquid crystal layer 23 of the first cholesteric liquid crystal module 2 to prepare, for example, red (R), green (G) or blue (B) and other colors. Here, the corresponding display color of the first cholesteric liquid crystal module 2 can be selected from, for example but not limited to, one of red, green and blue, or other colors of visible light. Since the cholesteric liquid crystal achieves a special alignment structure by adding an optical active agent to the nematic liquid crystal, and the cholesteric liquid crystal molecules can exhibit at least a focal conic state (Focal conic state) under different voltage differences, physical pressures and/or temperatures. , Planar state and vertical state (homeotropic state) and several different steady or transient states to achieve the display or clearing effect. Therefore, by changing the axis of the helical structure of the cholesteric liquid crystal, part of the light is reflected and/or part of the light passes through the cholesteric liquid crystal. That is, the display, writing, and even wiping functions of the micro-switch electronic writing board E can be achieved through the different light reflectance or transmittance of the cholesteric liquid crystal molecules in different states.

The micro-switch electronic writing board E of this embodiment may further include a voltage control circuit 4 electrically connected to the micro-switch array module 1 and the first cholesteric liquid crystal module 2 respectively. Here, the voltage control circuit 4 is electrically connected to the transparent conductive layer 12 of each micro switch unit 10 and the second transparent electrode layer 22 of the first cholesteric liquid crystal module 2 . When the micro switch unit 10 is pressed ( FIG. 3B ) so that the transparent conductive layer 12 is in contact with the first transparent electrode layer 14, thereby making the micro switch unit 10 conductive, the voltage control circuit 4 can pass through the transparent conductive layer of the micro switch unit 10 12 transmits the first voltage V1 to the first transparent electrode layer 14, so that the cholesteric liquid crystal molecules of the corresponding first cholesteric liquid crystal layer 23 transition, thereby displaying the writing track T or erasing the writing track T.

If the user wants to write characters or draw patterns on the micro-switch electronic writing board E, he can select the writing mode, and write on the micro-switch electronic writing board E with fingers, writing pen P (Fig. 3B) or other hard objects. At this time, the micro-switch unit 10 corresponding to the writing place (pressing place) will be turned on due to pressing its transparent conductive layer 12 in contact with the first transparent electrode layer 14, and the voltage control circuit 4 can be turned on through the micro-switch unit 10 of the conducting micro-switch unit 10. The transparent conductive layer 12 transmits the first voltage V1 to the first transparent electrode layer 14, and then transmits it to the first transparent electrode layer 14 on the lower surface of the second transparent substrate 13 through the conductive hole 133, and the voltage control circuit 4 also transmits the second voltage V1 to the first transparent electrode layer 14. V2 (such as a common voltage, such as but not limited to 0 volts) is transmitted to the second transparent electrode layer 22, then the electric field generated by the voltage difference (V1-V2) between the first transparent electrode layer 14 and the second transparent electrode layer 22 The cholesteric liquid crystal molecules in the corresponding first cholesteric liquid crystal layer 23 will be forced to transition from the focal conic state to the planar state, whereby the writing track T can be displayed. Here, the first voltage V1 minus the second voltage V2 is equal to the writing voltage.

For example, in the micro-switch electronic writing board E of this embodiment, when the micro-switch unit 10 is not pressed and there is no voltage difference between the first transparent electrode layer 14 and the second transparent electrode layer 22, the first cholesteric liquid crystal layer 23 cholesteric liquid crystal molecules are arranged in a focal conic state. At this time, most of the incident light can pass through the first light-transmitting substrate 11 and the second light-transmitting substrate 13 and penetrate the first cholesteric liquid crystal layer 23, and a small part of the incident light will be scattered, so the user will see the micro-switch electronics The background color of the writing board E, such as black. When the user uses a finger, writing pen P or other hard objects to write on the micro-switch electronic writing board E to turn on the corresponding micro-switch unit 10, the first voltage V1 will be transmitted to the second micro-switch unit 10 through the turned-on micro-switch unit 10. A transparent electrode layer 14, so that the electric field generated by the voltage difference (V1-V2) between the first transparent electrode layer 14 and the second transparent electrode layer 22 can make the corresponding cholesteric liquid crystal molecules transition from the original focal conic state to arranged in a flat state. At this time, part of the incident light is Bragg-reflected at the pressing place (that is, the recess of the first transparent substrate 11 ), and the reflected light (with a specific wavelength) is emitted from the light incident surface 111 . At the same time, the micro-switch electronic writing board E will display the color of the reflected light at the pressed place, thereby showing the writing track T (Fig. 1), and the writing track T will present the color corresponding to the first cholesteric liquid crystal module 2 ( e.g. red). Therefore, if the user writes characters or draws patterns on the micro-switch electronic writing board E to generate the writing track T, the writing track T will show the color corresponding to the reflected light, that is, the color corresponding to the micro-switch electronic writing board E.

On the other hand, if the user wants to wipe the writing track T on the micro-switch electronic writing board E, he can choose a wiping mode (can be partially or completely wiped). Here, the first voltage V1 supplied by the voltage control circuit 4 minus the second voltage V2 is equal to the wiping voltage. When the user utilizes a writing pen P or other wiping tools to press (back and forth) on the writing track T to be wiped, the microswitch unit 10 corresponding to the wiping place will make the transparent conductive layer 12 of the microswitch unit 10 It is in contact with the first transparent electrode layer 14 to conduct conduction. At this time, the first voltage V1 transmitted by the voltage control circuit 4 to the transparent conductive layer 12 will be transmitted to the first transparent electrode layer 14 through the turned-on micro switch unit 10, and then transmitted to the second transparent substrate 13 through the conductive hole 133. The first transparent electrode layer 14 on the lower surface. At this time, the electric field generated by the voltage difference (V1-V2) between the first transparent electrode layer 14 and the second transparent electrode layer 22 will force the corresponding cholesteric liquid crystal molecules to transition from a planar state to a focal conic state, thereby enabling Clear (wipe) the corresponding writing track T. Here, the difference between the first voltage V1 and the second voltage V2 is the wiping voltage.

In other words, in the micro-switch electronic writing board E of the present embodiment, when the user sees the colored writing track T on the light incident surface 111, if the user selects the wiping mode and uses the writing pen P (or wiping pen ) on the writing track T to turn on the corresponding micro-switch unit 10. At this time, the first voltage V1 transmitted by the voltage control circuit 4 will be transmitted to the first transparent electrode layer 14 through the micro-switch unit 10, so that the first transparent electrode layer The electric field generated by the voltage difference (V1-V2) between the layer 14 and the second transparent electrode layer 22 can make the corresponding cholesteric liquid crystal molecules change from the original planar state to the focal conic state alignment. At this time, at the wiping place (i.e., the depression of the first light-transmitting substrate 11), most of the incident light can pass through the first light-transmitting substrate 11, the second light-transmitting substrate 13 and penetrate the first cholesteric liquid crystal layer 23, so The user will see the background color of the micro-switch electronic writing board E at the wiping place, thereby removing the writing track T at the wiping place.

In addition, in some embodiments, the voltage control circuit 4 may also be directly electrically connected to all the first transparent electrode layers 14 . In this way, when the user switches the micro-switch electronic tablet E to a full-clear mode by pressing an all-clear key (virtual or physical button, not shown) on the micro-switch electronic tablet E, the voltage control The circuit 4 can directly transmit a clearing voltage to all the first transparent electrode layers 14 (without passing through the micro-opening unit W), thereby driving all the cholesteric liquid crystals in the liquid crystal control area 231 to transition to the focal conic state, thereby Clear all writing traces T on the entire screen. Of course, the voltage control circuit 4 can also directly send another type of clearing voltage to the second transparent electrode layer 22, so as to clear all the writing tracks T on the entire screen.

As mentioned above, in the micro-switch electronic writing board E of this embodiment, since the structures of the micro-switch array module 1 and the first cholesteric liquid crystal module 2 are relatively simple, the production cost is relatively low. Moreover, the micro-switch array module 1 and the first cholesteric liquid crystal module 2 of this embodiment only need to be superimposed on each other without precise positioning, and the micro-switch array module 1 can control the display of the first cholesteric liquid crystal module 2. The process is also quite simple. In other words, when the micro-switch unit 10 is pressed so that the transparent conductive layer 12 contacts the first transparent electrode layer 14, and then the micro-switch unit 10 is turned on, the voltage control circuit 4 can pass through the transparent conductive layer of the micro-switch unit 10. 12 transmits a control voltage (the first voltage V1) to the first transparent electrode layer 14, so that the cholesteric liquid crystal molecules of the corresponding first cholesteric liquid crystal layer 23 transition, thereby displaying the writing track T or erasing the writing track T. Therefore, the micro-switch electronic writing board E with the function of detecting the writing position or the wiping position of this embodiment has a relatively simple structure, relatively low manufacturing cost, and a relatively simple manufacturing process.

Please refer to FIG. 3C , the components and connections of the micro-switch electronic writing board E of this embodiment are substantially the same as those of the micro-switch electronic writing board of the previous embodiment. The difference is that the first substrate 21 of this embodiment is a light-transmitting substrate, and the micro-switch electronic writing board E can further include a back plate 5, and the back plate 5 is arranged on the first substrate 21 facing away from the first cholesteric liquid crystal layer 23 s surface. Here, the backplane 5 is disposed on the surface 212 of the first substrate 21 . The backplane 5 can be a black light-absorbing plate or include a light-absorbing layer, or the backplane 5 can also be a white light-reflecting plate or include a light-reflecting layer. When the back plate 5 is a black light-absorbing plate or contains a light-absorbing layer, it will absorb light passing through the surface 212, making the micro-switch electronic writing board E a blackboard. In some embodiments, the material of the black light absorbing plate (or light absorbing film) may be the same as that of the black matrix (black matrix) of the liquid crystal display device. In addition, when the back plate 5 is a white light reflection plate or includes a light reflection layer, it reflects light passing through the surface 212, making the micro-switch electronic writing board E a whiteboard. In some embodiments, the material of the white light reflective plate (or white light reflective film) may include metal, metal oxide, high reflective paint (white paint), or a combination thereof, which is not limited in the present invention. Or, in different embodiments, the color of the back plate 5 is not limited to black or white, it can be other colors or a combination of multiple colors, which is not limited.

Please refer to FIG. 4A and FIG. 4B , which are schematic structural diagrams of another embodiment of the micro-switch electronic writing board provided by the present invention. The micro-switch electronic writing board E of this embodiment is substantially the same as the micro-switch electronic writing board E of the foregoing embodiments in terms of component composition and connection relationship. The difference is that, in addition to the first cholesteric liquid crystal module 2 of the previous embodiment, the micro-switch electronic writing board E of this embodiment is further placed on the other surface 212 of the first substrate 21 of the first cholesteric liquid crystal module 2 A third transparent electrode layer 24 is provided at intervals, and the third transparent electrode layer 24 is electrically connected to the first transparent electrode layer 14 ( FIG. 4B ).

In addition, the micro-switch electronic writing board E of this embodiment further includes a second cholesteric liquid crystal module 3 , and the second cholesteric liquid crystal module 3 is overlapped with the first cholesteric liquid crystal module 2 . Wherein, the second cholesteric liquid crystal module 3 is arranged on the side of the first cholesteric liquid crystal module 2 away from the micro-switch array module 1, and the corresponding colors displayed by the first cholesteric liquid crystal module 2 and the second cholesteric liquid crystal module 3 are different. . Here, it is assumed that the color corresponding to the first cholesteric liquid crystal module 2 is red, and the color corresponding to the second cholesteric liquid crystal module 3 is green as an example. As shown in FIG. 4A and FIG. 4B , the second cholesteric liquid crystal module 3 includes a second substrate 31 , a fourth transparent electrode layer 32 and a second cholesteric liquid crystal layer 33 . Here, the fourth transparent electrode layer 32 is a common electrode, and is fully disposed on the surface 311 of the second substrate 31 facing the second cholesteric liquid crystal layer 33, and the second cholesteric liquid crystal layer 33 is disposed on the fourth transparent electrode layer 32 on. In addition, since the third transparent electrode layer 24 arranged at intervals is arranged on the surface 212 of the first substrate 21 facing the second cholesteric liquid crystal layer 33, the second cholesteric liquid crystal layer 33 is interposed between the third transparent electrode layer 24 and the fourth transparent electrode layer 24. between the electrode layers 32 . Here, the second cholesteric liquid crystal module 3 is stacked with the first cholesteric liquid crystal module 2 through the first substrate 21 , so that the second cholesteric liquid crystal layer 33 is interposed between the first substrate 21 and the second substrate 31 . In addition, the second cholesteric liquid crystal layer 33 may include a plurality of liquid crystal control areas 331, and each liquid crystal control area 331 is connected to each micro switch unit 10, each transparent conductive layer 12, each first transparent electrode layer 14, and each spaced apart second layer. Three transparent electrode layers 24 are arranged correspondingly.

In this embodiment, the first substrate 21 is a light-transmitting substrate, but the second substrate 31 is a light-absorbing substrate or a light-reflecting substrate. Of course, in different embodiments, similar to FIG. 3C , when the second substrate 31 is a light-transmitting substrate, a backplane may also be provided on the surface 312 of the second substrate 31 away from the second cholesteric liquid crystal layer 33 . In addition, each first transparent electrode layer 14 of this embodiment is electrically connected to each corresponding third transparent electrode layer 24 ( FIG. 4B ), therefore, the voltage transmitted to the first transparent electrode layer 14 can be simultaneously transmitted to the corresponding third transparent electrode layer 24. Three transparent electrode layers 24 . In addition, the voltage control circuit 4 of this embodiment is electrically connected to the transparent conductive layer 12 , the second transparent electrode layer 22 and the fourth transparent electrode layer 32 respectively. Here, the first voltage V1 transmitted by the voltage control circuit 4 to the transparent conductive layer 12 can be a writing voltage or an erasing voltage, and the second voltage transmitted by the voltage control circuit 4 to the second transparent electrode layer 22 and the fourth transparent electrode layer 32 V2 and the third voltage V3 can be a common voltage (for example, 0 volts), a writing voltage or an erasing voltage, depending on writing or erasing. In addition, the material of the first transparent substrate 11, the second transparent substrate 13, the first substrate 21, or the second substrate 31 of this embodiment can be plastic or glass, and the transparent conductive layer 12, the first transparent electrode layer 14 , the material of the second transparent electrode layer 22 , the third transparent electrode layer 24 , or the fourth transparent electrode layer 32 may be a transparent conductive material or graphene, which are not limited.

As shown in FIG. 4B , in the micro-switch electronic writing board E of this embodiment, when the micro-switch unit 10 is pressed and the micro-switch unit 10 is turned on, the voltage control circuit 4 can apply the first voltage through the micro-switch unit 10 V1 to the first cholesteric liquid crystal module 2 and/or the second cholesteric liquid crystal module 3 to display the writing track T or erase the writing track T accordingly. Specifically, assuming that the user writes on the micro-switch electronic writing board E, and wants to make the writing track T present the red color corresponding to the first cholesteric liquid crystal module 2, and when the writing pen P is pressed on the light incident surface 111, Writing, so that when the micro-switch unit 10 corresponding to the pressed position is turned on, the first voltage V1 can be transmitted to the first transparent electrode layer 14 of the second surface 132 of the second transparent substrate 13 through the transparent conductive layer 12 of the micro-switch unit 10 , thereby controlling the transition of the cholesteric liquid crystal molecules corresponding to the first cholesteric liquid crystal module 2 to a planar state, so that the writing traces display a corresponding red color. Here, the difference between the first voltage V1 and the second voltage V2 is the writing voltage. At this time, the first voltage V1 will also be transmitted to the third transparent electrode layer 24 through the first transparent electrode layer 14. In order not to display the green color corresponding to the second cholesteric liquid crystal module 3, the voltage control circuit 4 will not transmit the common voltage, but transmit the same third voltage V3 as the first voltage V1 to the fourth transparent electrode layer 32 (that is, the third voltage V3 is equal to the first voltage V1), so that the third transparent electrode layer 24 at the corresponding pressing position and the fourth transparent electrode layer 32 The voltage difference of the transparent electrode layer 32 is 0, thereby making the conduction of the microswitch unit 10 not affect the liquid crystal control area 331 of the second cholesteric liquid crystal layer 33 of the corresponding second cholesteric liquid crystal module 3, therefore, the writing track T is just The green corresponding to the second cholesteric liquid crystal module 3 will not be displayed.

Conversely, if the user selects green, although the first voltage V1 can be transmitted to the first transparent electrode layer 14 through the micro-switch unit 10, because the voltage control circuit 4 does not transmit a common voltage, it will transmit the same voltage as the first voltage. V1 is the same as the second voltage V2 to the second transparent electrode layer 22, so that the voltage difference between the first transparent electrode layer 14 and the second transparent electrode layer 22 is 0, then the writing track T will not appear in the first cholesteric liquid crystal module 2 Corresponding red; however, the first voltage V1 will be transmitted to the third transparent electrode layer 24 through the first transparent electrode layer 14, so that there is a voltage between the third transparent electrode layer 24 and the fourth transparent electrode layer 32 (common voltage) The pressure difference causes the cholesteric liquid crystal molecules corresponding to the second cholesteric liquid crystal layer 33 to transition to a planar state, thereby making the writing track T display the green color corresponding to the second cholesteric liquid crystal module 3 . In addition, if the cholesteric liquid crystal molecules in the first cholesteric liquid crystal module 2 and the second cholesteric liquid crystal module 3 are in a planar state at the same time, the writing track T will display a mixed color (blue) of red and green, thereby making micro The electronic writing board E can display colorful writing traces T by switching on and off. Similarly, in the wiping mode, the user can also choose to erase the writing traces of a certain color according to the above control principle, or choose to erase the writing traces of the mixed color of the two colors. The specific control method can refer to the above description .

In addition, in some embodiments, a third cholesteric liquid crystal module (not shown) can also be stacked on the side of the second cholesteric liquid crystal module 3 away from the first cholesteric liquid crystal module 2, and the third cholesteric liquid crystal module The corresponding colors of the liquid crystal module, the first cholesteric liquid crystal module 2 and the second cholesteric liquid crystal module 3 are all different, so that the colors of the writing tracks T are more diversified.

5A and 5B are structural schematic diagrams of yet another embodiment of the micro-switch electronic writing board provided by the present invention. As shown in FIG. 5A and FIG. 5B , the components and connections of the micro-switch electronic tablet E of this embodiment are substantially the same as those of the micro-switch electronic tablet E of the previous embodiment. The difference is that the micro-switch electronic writing board E of this embodiment further includes a second cholesteric liquid crystal module 3 , and the second cholesteric liquid crystal module 3 is overlapped with the first cholesteric liquid crystal module 2 .

Here, it is still taken as an example that the color corresponding to the first cholesteric liquid crystal module 2 is red, and the color corresponding to the second cholesteric liquid crystal module 3 is green. As shown in Figure 5A and Figure 5B, the second cholesteric liquid crystal module 3 includes a second substrate 31, a fourth transparent electrode layer 32, a second cholesteric liquid crystal layer 33, a third transparent substrate 34 and a fifth transparent electrode layer 35 . Here, the fourth transparent electrode layer 32 can be a common electrode, and is disposed on the surface 311 of the second substrate 31 facing the second cholesteric liquid crystal layer 33, and the second cholesteric liquid crystal layer 33 is disposed on the fourth transparent electrode. on layer 32. In addition, the third light-transmitting substrate 34 is disposed on the second cholesteric liquid crystal layer 33, and a surface 341 of the third light-transmitting substrate 34 facing the second cholesteric liquid crystal layer 33 is provided with fifth transparent electrode layers 35 arranged at intervals, Therefore, the second cholesteric liquid crystal layer 33 is sandwiched between the fifth transparent electrode layer 35 and the fourth transparent electrode layer 32 . Wherein, the second cholesteric liquid crystal module 3 is stacked with the first cholesteric liquid crystal module 2 through the first substrate 21 and the third transparent substrate 34 . In addition, the second cholesteric liquid crystal layer 33 may include a plurality of liquid crystal control areas 331, and each liquid crystal control area 331 is respectively connected to each micro switch unit 10, each transparent conductive layer 12, each first transparent electrode layer 14, and each spaced apart second layer. Five transparent electrode layers 35 are arranged correspondingly.

In this embodiment, the first substrate 21 is a light-transmitting substrate, but the second substrate 31 is a light-absorbing substrate or a light-reflecting substrate. Of course, in different embodiments, similar to FIG. 3C , when the second substrate 31 is a light-transmitting substrate, a backplane may also be provided on the surface 312 of the second substrate 31 away from the second cholesteric liquid crystal layer 33 . In addition, the fifth transparent electrode layer 35 of this embodiment is electrically connected to the corresponding first transparent electrode layer 14 , therefore, the voltage transmitted to the first transparent electrode layer 14 can be simultaneously transmitted to the corresponding fifth transparent electrode layer 35 . In addition, the voltage control circuit 4 of this embodiment is electrically connected to the transparent conductive layer 12 , the second transparent electrode layer 22 and the fourth transparent electrode layer 32 respectively. Here, the first voltage V1 transmitted by the voltage control circuit 4 to the transparent conductive layer 12 can be a writing voltage or an erasing voltage, and the second voltage transmitted by the voltage control circuit 4 to the second transparent electrode layer 22 and the fourth transparent electrode layer 32 V2 and the third voltage V3 can be a common voltage (for example, 0 volts), a writing voltage or an erasing voltage, depending on writing or erasing. In addition, the material of the first transparent substrate 11, the second transparent substrate 13, the third transparent substrate 34, the first substrate 21, or the second substrate 31 of this embodiment can be plastic or glass, and the material can be plastic or glass. glass, and the material of the transparent conductive layer 12, the first transparent electrode layer 14, the second transparent electrode layer 22, the third transparent electrode layer 24, the fourth transparent electrode layer 32, or the fifth transparent electrode layer 35 can be a transparent conductive material Or graphene, neither is limited.

As shown in FIG. 5B , in the micro-switch electronic writing board E of this embodiment, when the micro-switch unit 10 is pressed and the micro-switch unit 10 is turned on, the voltage control circuit 4 can apply the first voltage through the micro-switch unit 10 V1 to the first cholesteric liquid crystal module 2 and/or the second cholesteric liquid crystal module 3 to display the writing track T or erase the writing track T accordingly. Specifically, assuming that the user writes on the micro-switch electronic writing board E, and wants to make the writing track T present the red color corresponding to the first cholesteric liquid crystal module 2, and when the writing pen P is pressed on the light incident surface 111, Writing, so that when the micro-switch unit 10 corresponding to the pressed position is turned on, the first voltage V1 can be transmitted to the first transparent electrode layer 14 of the second surface 132 of the second transparent substrate 13 through the transparent conductive layer 12 of the micro-switch unit 10 , thereby controlling the transition of the cholesteric liquid crystal molecules corresponding to the first cholesteric liquid crystal module 2 to a planar state, so that the writing traces display a corresponding red color. At this time, the first voltage V1 will also be transmitted to the fifth transparent electrode layer 35 through the first transparent electrode layer 14. In order not to display the green color corresponding to the second cholesteric liquid crystal module 3, the voltage control circuit 4 will not transmit the common voltage V1. Instead, the third voltage V3, which is the same as the first voltage V1, is transmitted to the fourth transparent electrode layer 32, so that the pressure difference between the fifth transparent electrode layer 35 and the fourth transparent electrode layer 32 at the corresponding pressing position is 0, thereby The conduction of the micro-switch unit 10 does not affect the liquid crystal control area 331 of the second cholesteric liquid crystal layer 33 of the corresponding second cholesteric liquid crystal module 3, therefore, the writing track T will not display the corresponding second cholesteric liquid crystal module 3 green.

Conversely, if the user selects green, although the first voltage V1 can be transmitted to the first transparent electrode layer 14 through the micro-switch unit 10, because the voltage control circuit 4 does not transmit a common voltage, it will transmit the same voltage as the first voltage. V1 is the same as the second voltage V2 to the second transparent electrode layer 22, so that the voltage difference between the first transparent electrode layer 14 and the second transparent electrode layer 22 is 0, then the writing track T will not appear in the first cholesteric liquid crystal module 2 Corresponding red; however, the first voltage V1 will be transmitted to the fifth transparent electrode layer 35 through the first transparent electrode layer 14, so that the fifth transparent electrode layer 35 and the fourth transparent electrode layer 32 (the third voltage V3 are common) voltage) to make the cholesteric liquid crystal molecules corresponding to the second cholesteric liquid crystal layer 33 transition to a planar state, thereby making the writing track T display the green color corresponding to the second cholesteric liquid crystal module 3 . In addition, if the cholesteric liquid crystal molecules of the first cholesteric liquid crystal module 2 and the second cholesteric liquid crystal module 3 are in a planar state at the same time, the writing track T will display a mixed color (blue) of red and green, thereby making the micro switch The electronic writing board E can display colorful writing tracks T. Similarly, in the wiping mode, the user can also choose to erase the writing traces of a certain color according to the above control principle, or choose to erase the writing traces of the mixed color of the two colors. The specific control method can refer to the above description .

In addition, in some embodiments, a third cholesteric liquid crystal module (not shown) can also be stacked on the side of the second cholesteric liquid crystal module 3 in this embodiment away from the first cholesteric liquid crystal module 2 , and The corresponding colors of the third cholesteric liquid crystal module, the first cholesteric liquid crystal module 2 and the second cholesteric liquid crystal module 3 are all different, so that the colors of the writing track T are more diversified.

In summary, the micro-switch electronic writing board of the present invention includes a micro-switch array module and a cholesteric liquid crystal module. The micro-switch array module has a plurality of micro-switch units configured in an array. The transparent conductive layer of each micro-switch unit is arranged on the surface of the first light-transmitting substrate facing away from the light incident surface, and the first transparent electrode layer is arranged on the second light-transmitting substrate. and extended to the second surface of the second light-transmitting substrate through conductive holes; wherein, the micro-switch array module is stacked with the cholesteric liquid crystal module through the second light-transmitting substrate, so that the cholesteric liquid crystal The layer is between the first substrate and the second transparent substrate. In this way, since the structure of the micro-switch array module and the cholesteric liquid crystal module is quite simple, the manufacturing cost is not high; and after the micro-switch array module and the cholesteric liquid crystal module are superimposed on each other, it can be made into a device capable of detecting the writing position or wiping. The micro-switch electronic writing board with position function, the process is also quite simple. Therefore, the micro-switch electronic writing board of the present invention has the effect of simple and convenient manufacturing process and low manufacturing cost, and because the voltage of the electrode layers such as the first transparent electrode layer and the second transparent electrode layer is controlled by the voltage control circuit, the present invention therefore The micro-switch electronic writing board can also have the function of detecting the writing position or wiping position at the same time.

The above descriptions are illustrative only, not restrictive. Any equivalent modification or change made without departing from the spirit and scope of the present invention shall be included in the patent scope of this application.

Claims (14)

1. A micro-switch electronic tablet, comprising:

a micro switch array module having a plurality of micro switch units arranged in an array, each micro switch unit comprising:

a first transparent substrate having a light incident surface;

a transparent conductive layer arranged on the surface of the first light-transmitting substrate back to the light incident surface;

a second transparent substrate having a first surface facing the transparent conductive layer and a second surface opposite to the first surface, the second transparent substrate having a conductive hole penetrating through the first surface and the second surface;

a first transparent electrode layer disposed on the first surface of the second transparent substrate and extending to the second surface of the second transparent substrate through the conductive hole; and

at least one spacer disposed between the first transparent substrate and the second transparent substrate; and

a first cholesteric liquid crystal module, comprising:

a first substrate, a second transparent electrode layer is arranged on one surface of the first substrate; and

a first cholesterol liquid crystal layer arranged on the second transparent electrode layer;

the micro-switch array module is mutually overlapped with the first cholesterol liquid crystal module through the second transparent substrate, so that the first cholesterol liquid crystal layer is arranged between the first substrate and the second transparent substrate.

2. The micro-switch electronic tablet of claim 1, further comprising a second cholesteric liquid crystal module, the second cholesteric liquid crystal module comprising:

a second substrate, one surface of which is provided with a fourth transparent electrode layer; and

a second cholesterol liquid crystal layer arranged on the fourth transparent electrode layer;

the second cholesterol liquid crystal module is mutually overlapped with the first cholesterol liquid crystal module through the first substrate, so that the second cholesterol liquid crystal layer is arranged between the first substrate and the second substrate;

wherein, the other surface of the first substrate of the first cholesteric liquid crystal module is provided with a third transparent electrode layer which is arranged at intervals.

3. The microswitch electronic writing board of claim 2 wherein said third transparent electrode layer is electrically connected to said first transparent electrode layer.

4. The microswitch electronic tablet of claim 1, wherein the material of the first transparent substrate, the second transparent substrate, or the first substrate is plastic or glass.

5. The microswitch electronic writing board of claim 1 wherein the first transparent substrate is a glass substrate and the thickness of the glass substrate is between 0.1mm and 0.35 mm.

6. The micro-switch electronic writing board of claim 1, wherein the material of the transparent conductive layer, the first transparent electrode layer, or the second transparent electrode layer is a transparent conductive material or graphene.

7. The micro-switch electronic tablet of claim 1, further comprising:

and the voltage control circuit is electrically connected with the transparent conducting layer and the second transparent electrode layer respectively.

8. The microswitch electronic writing board of claim 2 wherein the material of the second substrate is plastic or glass.

9. The micro-switch electronic writing board of claim 2, wherein the material of the fourth transparent electrode layer is a transparent conductive material or graphene.

10. The micro-switch electronic tablet of claim 1, further comprising a second cholesteric liquid crystal module, the second cholesteric liquid crystal module comprising:

a second substrate, one surface of which is provided with a fourth transparent electrode layer;

a second cholesterol liquid crystal layer arranged on the fourth transparent electrode layer; and

a third transparent substrate disposed on the second cholesteric liquid crystal layer, wherein a fifth transparent electrode layer disposed at an interval is disposed on a surface of the third transparent substrate facing the second cholesteric liquid crystal layer,

the second cholesteric liquid crystal module is mutually overlapped with the first cholesteric liquid crystal module through the first substrate and the third light-transmitting substrate.

11. The microswitch electronic writing board of claim 10 wherein said fifth transparent electrode layer is electrically connected to said first transparent electrode layer.

12. The micro-switch electronic writing board of claim 10, wherein the material of the second substrate or the third transparent substrate is plastic or glass.

13. The micro-switch electronic writing board of claim 10, wherein the material of the fourth transparent electrode layer or the fifth transparent electrode layer is a transparent conductive material or graphene.

14. The micro-switch electronic tablet of claim 2 or 10, further comprising:

and the voltage control circuit is electrically connected with the transparent conducting layer, the second transparent electrode layer and the fourth transparent electrode layer respectively.

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