CN115083240B - Static driven braille point display device and method - Google Patents

Abstract

The invention discloses an electrostatically driven braille point display device and method, comprising a casing, a touch panel is arranged on the top of the casing, a braille contact is movable on the touch panel, an electrostatic driving component is arranged at the bottom of the casing, The electrostatic drive assembly includes a right fixed plate and a left fixed plate fixedly connected to the housing, a movable plate is provided between the right fixed plate and the left fixed plate, and the movable plate is fixedly connected with the Braille contacts , the right fixed plate and the left fixed plate drive the moving plate to move up and down through a periodic electrostatic field, and the present invention generates a periodically changing electrostatic field through the voltage change between the left and right fixed plates, and absorbs the moving up and down achieved by the moving plate. The movement of the braille contact is linked to finally realize the display of the braille contact. The limit distance of the braille contact can be adjusted by controlling the number of cycles to adapt to the touch habits of the visually impaired.

Description

An electrostatically driven braille display device and method

technical field

The invention relates to the technical field of educational equipment for the visually impaired, in particular to an electrostatically driven Braille display device and method.

Background technique

The disadvantages of traditional braille books, such as large size, high production cost, and not easy to carry, restrict the information acquisition of the visually impaired. Braille displays can convert traditional text into dynamic dots, replacing traditional bulky Braille books. It is an important way to solve the problem of information acquisition for the visually impaired, and it is playing an increasingly important role in the lives of the visually impaired. . The Braille contact driving mechanism is an important component of the Braille reading device. Researchers at home and abroad have developed different driving forms of the Braille contact driving mechanism based on different principles, mainly including piezoelectric ceramics, electric stimulation, memory alloy, pneumatic, temperature control, Electromagnetic and other new materials and other driving methods, among which the piezoelectric ceramic braille display is based on vibration stimulation, the electric stimulation braille display is based on current stimulation, the temperature control braille display is based on temperature stimulation, memory alloy Type, pneumatic type and electromagnetic type are based on pressure stimulation.

The disadvantages of the current dot display mainly include:

1. Piezoelectric ceramic type, which controls the transformation of Braille dots by amplifying the volume of the piezoelectric ceramic to change its volume, such as CN202010384742.4, CN201921948044.1. This type of point display cannot provide about 0.4mm due to the piezoelectric ceramic itself. (GB/T15720-1995 standard is 0.2-0.5mm) of the ejector rod stroke requires the use of an auxiliary lever mechanism. As a result, the plane space occupied is too large, the volume is huge, and the connecting parts are many and complicated.

2. Electromagnetic type, which mainly utilizes the characteristics that the electromagnetic coil has the characteristics of generating a magnetic field when it is energized and disappearing when it is turned off, to drive the protrusion and decline of the Braille contact, such as CN201710034430.9, CN201810076657.4, this type of display uses electromagnets (or miniature The motor) mechanism can limit each point to a plane less than 2.8mm square, but the whole device has a large current demand, high power consumption, needs to install a cooling device, and has a large volume. Considering various factors such as its cost and power consumption, the electromagnetic type Braille displays are difficult to commercialize;

3. Memory alloy type, the use of special materials can realize the plano-convex changes of Braille contacts without complicated mechanical structures, such as CN03256935.1, which uses single-pass memory alloy wires to control the changes of Braille contacts. CN200810047306 improves the use of materials Two-way memory alloy flakes control the change of Braille contacts. However, the alloy material has the disadvantages of slow shape state change and weak mechanical strength, which seriously affects the frequency conversion and durability of Braille displays. In addition, due to the high price of the alloy material, the manufacturing cost of the braille display screen is high and it is not easy to popularize.

4. Mechanical control types such as motor type, pneumatic or hydraulic type, such as CN201810076735.0, CN201811196493.5, this type of point display has complex structure, cumbersome process, difficult production, and relatively large quality and volume, so it is difficult to be popularized.

Due to the shortcomings of the above types of dot displays, most of the above are still in the early stage of principle testing, and only a small part of them are commercialized. However, the braille display devices that have been commercialized are either expensive and difficult to popularize, or the devices are bulky and difficult to carry. These shortcomings have seriously hindered the popularization of Braille display devices and limited the use of visually impaired groups. Therefore, it is urgent to find a new driving method to realize braille display, and it is urgent to design a braille display device with low energy consumption, light structure, low cost, light weight and portability.

Contents of the invention

The object of the present invention is to provide an electrostatically driven braille display device and method to overcome the deficiencies in the prior art.

To achieve the above object, the present invention provides the following technical solutions:

The invention discloses an electrostatically driven Braille point display device, which comprises a casing, a touch panel is arranged on the top of the casing, a Braille contact is movable on the touch panel, an electrostatic driving component is arranged at the bottom of the casing, and the The electrostatic drive assembly includes a right fixed plate and a left fixed plate fixedly connected to the housing, a moving plate is movable between the right fixed plate and the left fixed plate, and the moving plate is fixedly connected with the Braille contacts, so The right fixed plate and the left fixed plate drive the moving plate to move up and down through a periodic electrostatic field.

As a preference, several driving electrodes are arranged on the right fixed plate and the left fixed plate, the driving electrodes on the right fixed plate and the left fixed plate are arranged alternately up and down, and the moving plate is provided with several moving electrodes. The plate electrode, the driving electrode periodically attracts the moving plate electrode to control the moving plate to move between the right fixed plate and the left fixed plate.

Preferably, a mounting plate is provided at the bottom of the housing, a fixing slot is provided on the mounting board, the right fixed plate and the left fixed plate are fixedly installed in the slots, and a protective plate is provided on the side of the housing, so Both the mounting plate and the protective plate are made of insulating materials.

Preferably, the moving plate and the Braille contacts are fixedly connected by a connecting rod, and the connecting rod is made of spring steel.

As a preference, the Braille contacts on the touch panel are made of insulating lightweight materials and are hemispherical. The size of the Braille contacts and the gap between the Braille contacts meet the requirements of the national standard GB/T15720 on Braille contacts. requirements.

Preferably, there is a gap between the Braille contact and the installation hole on the touch panel, there is a gap between the moving plate and the right fixed plate and the left fixed plate, and the size of the gap is the same.

Preferably, the right fixed plate and the left fixed plate include an insulating base and driving electrodes, the driving electrodes are elongated and arranged horizontally, the driving electrodes are divided into several groups, and each group of driving electrodes includes at least four electrodes The electrode strips are sequentially numbered 1, 2, ... n, and the electrode strips with the same number in each group of driving electrodes are connected in parallel, and the energizing voltage is the same.

Preferably, the moving plate includes an insulating base and moving plate electrodes, the moving plate electrodes are elongated and arranged horizontally, the moving plate electrodes are divided into several groups, and each group of moving plate electrodes is provided with at least two electrodes The electrode strips are numbered 1, 2, ... m in turn, and the electrode strips with the same number in each group of moving plate electrodes are connected in parallel, and the energizing voltage is the same.

Preferably, the insulating substrate is made of polyimide material, the dielectric constant is greater than 4.0, and the dielectric loss is between 0.004 and 0.007, the driving electrode and the moving plate electrode are made of copper foil, and chemical Corrosion method or by flexible processing technology.

Preferably, the distance between the driving electrodes on the right fixed plate and the left fixed plate is the same, the distance is represented as t, the vertical stagger distance of the driving electrodes on the right fixed plate and the left fixed plate is 0.5t, and the moving plate The distance between the electrodes of the moving plate is consistent and is 2t.

The invention discloses an electrostatically driven braille display method, which comprises the following steps:

S1: Place the moving plate connected with the Braille contact between the left and right fixed plates, and several electrodes are set on the moving plate and the left and right fixed plates;

S2: Provide positive and negative normal voltages to the adjacent electrode strips on the moving plate;

S3: Control the voltage of the electrode strips on the left and right fixed plates to change periodically, control the left and right fixed plates to adsorb the moving plate alternately in turn, control the moving plate to move up and down through electrostatic adsorption, and drive the Braille contacts to move up and down.

Preferably, the moving plate can slide up and down between the left and right fixed plates, and several electrode bars on the left and right fixed plates are arranged alternately up and down, and the distance between the electrode bars on the right fixed plate and the left fixed plate is the same , the spacing is denoted as t, the vertical stagger distance of the electrode strips on the right fixed plate and the left fixed plate is , and the spacing of the electrode strips on the moving plate is the same and is 2t.

As preferably, said step S3 includes the following sub-steps:

S31: Provide voltage to the electrode strips on the left and right fixed plates, and control the moving plate to be adsorbed on one of the fixed plates;

S32: Change the voltage of the electrode strips on the fixed plate that is adsorbed to the moving plate, so that the fixed plate gives the moving plate an upward or downward force, so that the moving plate is adsorbed on another fixed plate, and completes upward or downward down displacement;

S33: According to step S32, the voltage of the electrode strips on the fixed plate is periodically changed, so that the movable plate moves a longer distance between the left and right fixed plates, and the Braille contacts connected with the movable plate move up or down to a designated position.

Preferably, the limit position of the upward movement of the Braille contact in step S33 is adjusted by setting the number of cycles for changing the voltage of the electrode strips on the fixed plate.

The present invention has the following beneficial effects:

(1) Through the voltage change between the left and right fixed plates, the present invention generates a periodically changing electrostatic field, absorbs the moving plate to move up and down and links the movement of the Braille contacts, and finally realizes the display of Braille electric shocks, in which the Braille contacts move up The limit distance can be adjusted by controlling the number of cycles to adapt to the touch habits of the visually impaired;

(2) The structure of the present invention is light and handy, meeting the size and spacing requirements of Braille contacts;

(3) The present invention adopts the principle of electrostatic adsorption, and has strong adsorption force, which can effectively prevent visually impaired people from mispressing and causing inaccurate display results when touching;

(4) The present invention has good compatibility with integrated circuits, and the materials are easy to obtain and low in cost, which is conducive to the promotion of Braille displays;

(5) Compared with the electromagnetic driving mode of the present invention, the present invention does not use electromagnetic materials, and there is no problem of electromagnetic interference.

Description of drawings

Fig. 1 is a schematic diagram of the internal structure of the present invention;

Fig. 2 is a schematic diagram of the external structure of the present invention;

Figure 3 is a comparison before and after the raised Braille dots;

Figure 4 is a schematic diagram of the drive assembly;

Fig. 5 is a schematic diagram of a braille point display character;

Fig. 6 is a structural schematic diagram of the left and right fixed plates and fixed plates of the present invention;

Fig. 7 is the voltage change diagram of electrostatic drive;

Fig. 8 is a schematic diagram of timing work of electrostatic drive;

In the figure: 1-housing, 2-touch panel, 3-installation plate, 4-protection plate, 5-moving plate, 51-moving plate electrode, 6-right fixed plate, 61-driving electrode, 7-left fixed plate, 8-connecting rod, 9-braille contact.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described here are only used to explain the present invention, and are not intended to limit the scope of the present invention. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concept of the present invention.

As shown in Figures 1 to 6, an embodiment of the present invention provides an electrostatically driven Braille display device, which includes a housing 1, a touch panel 2 is provided on the top of the housing 1, and a Braille touch panel is movable on the touch panel 2. Point 9, the bottom of the housing 1 is provided with an electrostatic drive assembly. In this embodiment, the number of the Braille contacts 9 is 6, and the number of the electrostatic drive assemblies is 6, corresponding to each Braille contact above. , the electrostatic drive assembly includes a right fixed plate 6 and a left fixed plate 7 fixedly connected to the housing 1, a movable plate 5 is provided between the right fixed plate 6 and the left fixed plate 7, and the movable plate 5 Fixedly connected with the Braille contact 9, the right fixed plate 6 and the left fixed plate 7 drive the moving plate 5 to move up and down through a periodic electrostatic field.

The right fixed plate 6 and the left fixed plate 7 are provided with several drive electrodes 61, the drive electrodes 61 on the right fixed plate 6 and the left fixed plate 7 are arranged alternately up and down, and the moving plate 5 is provided with A plurality of moving plate electrodes 51 , the driving electrodes 61 periodically attract the moving plate electrodes 51 to control the moving plate 5 to move between the right fixed plate 6 and the left fixed plate 7 .

The bottom of the shell 1 is provided with a mounting plate 3, the mounting plate 3 is provided with a fixed slot, the right fixed plate 6 and the left fixed plate 7 are fixedly installed in the slot, and the side of the shell 1 is provided with a protective plate 4. Both the installation board 3 and the protection board 4 are made of insulating materials.

The Braille contacts 9 on the touch panel 2 are made of insulating light materials and are hemispherical. The size of the Braille contacts 9 and the gap between the Braille contacts 9 meet the requirements of the national standard GB/T15720 on Braille contacts. requirements.

There is a gap between the Braille contact 9 and the installation hole for installing the Braille contact 9 on the touch panel 2, there is a gap between the moving plate 5 and the right fixed plate 6 and the left fixed plate 7, both The gap size is consistent. The moving plate 5 is fixedly connected to the Braille contact 9 through a connecting rod 8, and the connecting rod 8 is made of spring steel. Since the moving plate will move between the left and right fixed plates, the above two gaps are to prevent the moving plate from being restricted when moving. In addition, the connecting rod is made of spring steel to prevent the moving plate from being restricted when the moving plate is tightly attached to the left and right moving plates.

The right fixed plate 6 and the left fixed plate 7 include an insulating base and driving electrodes 61, the driving electrodes 61 are elongated and arranged horizontally, the driving electrodes are divided into several groups, and each group of driving electrodes includes at least four electrodes The electrode strips are sequentially numbered 1, 2, ... n, and the electrode strips with the same number in each group of driving electrodes are connected in parallel, and the energizing voltage is the same. In this embodiment, four sets of driving electrodes are provided on the left and right fixed plates, and each set of driving electrodes includes four electrode strips numbered 1, 2, 3, and 4, that is, n=4. The moving plate 5 includes an insulating base and a moving plate electrode 51. The moving plate electrode 51 is elongated and arranged horizontally. The moving plate electrode is divided into several groups, and each group of moving plate electrodes is provided with at least two electrode strips. , the electrode strips are numbered 1, 2, ... m in sequence, and the electrode strips with the same number in each group of moving plate electrodes are connected in parallel, and the energizing voltage is the same. In this embodiment, three sets of moving plate electrodes are provided on the moving plate, and each set of moving plate electrodes includes two electrode strips numbered 1 and 2, that is, m=2. The thickness of the electrode is at the level of microns, and the thickness of the substrate is at the level of millimeters.

The insulating substrate is made of polyimide material, the dielectric constant is greater than 4.0, and the dielectric loss is between 0.004 and 0.007. The driving electrode 61 and the moving plate electrode 51 are made of copper foil and chemically etched. way or by flexible processing technology.

The drive electrodes 61 on the right fixed plate 6 and the left fixed plate 7 have the same spacing, and the distance is represented as t. The vertical stagger distance of the drive electrodes 61 on the right fixed plate 6 and the left fixed plate 7 is 0.5t. The distance between the moving plate electrodes 51 on the moving plate 5 is consistent and is 2t.

An embodiment of the present invention provides an electrostatically driven Braille pointing method, comprising the following steps:

S1: Place the moving plate connected with the Braille contact between the left and right fixed plates, and several electrodes are set on the moving plate and the left and right fixed plates;

S2: The positive and negative opposites of two adjacent electrodes on the control brake plate remain unchanged;

S2: Provide positive and negative normal voltages to the adjacent electrode strips on the moving plate;

S3: Control the voltage of the electrode strips on the left and right fixed plates to change periodically, control the left and right fixed plates to adsorb the moving plate alternately in turn, control the moving plate to move up and down through electrostatic adsorption, and drive the Braille contacts to move up and down.

The moving plate can slide up and down between the left and right fixed plates, and several electrode strips on the left and right fixed plates are arranged alternately up and down, the distance between the electrode strips on the right fixed plate and the left fixed plate is the same, and the distance Denoted as t, the vertical stagger distance of the electrode bars on the right fixed plate and the left fixed plate is , and the distance between the electrode bars on the moving plate is the same and is 2t.

The step S3 includes the following sub-steps:

S31: Provide voltage to the electrode strips on the left and right fixed plates, and control the moving plate to be adsorbed on one of the fixed plates;

S32: Change the voltage of the electrode strips on the fixed plate that is adsorbed to the moving plate, so that the fixed plate gives the moving plate an upward or downward force, so that the moving plate is adsorbed on another fixed plate, and completes upward or downward down displacement;

S33: According to step S32, the voltage of the electrode strips on the fixed plate is periodically changed, so that the movable plate moves a longer distance between the left and right fixed plates, and the Braille contacts connected with the movable plate move up or down to a designated position.

The limit position of the upward movement of the Braille contact in step S33 is adjusted by setting the number of cycles for changing the voltage of the electrode strips on the fixed plate.

In this embodiment, the connection mode between the electrode strips on the left fixed plate and the right fixed plate is shown in FIG. 6 . The electrode strips of each group of driving electrodes on the left fixed plate and the right fixed plate are numbered as electrodes 1, 2, 3, and 4 in order from top to bottom, and all electrodes numbered 1 on the left and right fixed plates are connected. Expressed as U _a1 , U _a ; all electrodes numbered 2 are connected, expressed as U _b1 , U _b ; all electrodes numbered 3 are connected, expressed as U _c1 , U _c , all electrodes numbered 4 are connected to each other Connected, denoted as U _d1 , U _d . The connection mode of the electrode strips on the movable plate is as follows: No. 1 electrode is connected, denoted as U ₁ , and No. 2 electrode is connected, denoted as U ₂ . The left fixed plate and the right fixed plate are placed vertically and parallel to each other; in addition, the electrodes of the left and right fixed plates are staggered, and the moving plate is located between the left and right fixed plates, which is also vertical. The Coulomb force generated by the different voltages between the movable plates attracts the movable plates to generate left and right motion. Since the electrode strips on the left fixed plate and the electrode strips on the right fixed plate are staggered, the moving plate moves up and down while moving left and right, and finally realizes two states of raised and lowered Braille dots.

Figure 7 is the voltage change diagram of electrostatic drive. In this embodiment, the voltages applied to the electrode strips on the left fixed plate and the electrode strips on the right fixed plate are U _a1 , U _b1 , U _c1 , U _d1 and U _a , U _b , U _c , U _d respectively. The position of the plate changes periodically. The energizing voltages U ₁ and U ₂ of the movable plate electrodes are positive and negative normal voltages, which remain unchanged.

Referring to Figure 7 and Figure 8, the following describes the working state of the drive assembly in one cycle:

Time T0 (the moment when sequence 1 starts): the movable plate is at the initial position of a motion cycle, U _a , U _b , U _c , and U _d are respectively zero voltage, positive voltage, zero voltage, and negative voltage; at the same time, U _a1 , U _b1 , U _c1 , and U _d1 are respectively positive voltage, zero voltage, negative voltage, and zero voltage. Due to electrostatic attraction, the moving plate is attracted to the right fixed plate.

Time T1 (the end of sequence 1 and the start of sequence 2): the voltage on the electrode strips on the left and right fixed plates is reversed as shown in Figure 7, and the electrode strips U _a , U _b , U _c , U _d on the right fixed plate are respectively Change to zero voltage, negative voltage, zero voltage, positive voltage, and the electrode strips U _a1 , U _b1 , U _c1 , U _d1 on the left fixed plate change to zero voltage, positive voltage, zero voltage, and negative voltage; at this time, the moving plate and The right fixed plate repels each other, and the right fixed plate gives the moving plate an upward electrostatic force, making the moving plate and the left fixed plate attract each other. Due to the staggered 1/2 electrode spacing, the moving plate moves upward by 1 while moving to the left. /2t.

Time T2 (the end of sequence 2 and the start of sequence 3): the voltage on the electrode strips on the left and right fixed plates is reversed as shown in Figure 7, and the electrode strips U _a , U _b , U _c , U _d on the right fixed plate change are positive voltage, zero voltage, negative voltage, and zero voltage, and the electrode strips U _a1 , U _b1 , U _c1 , and U _d1 on the left fixed plate change to zero voltage, negative voltage, zero voltage, and positive voltage respectively; at this time, the moving plate and The left fixed plate repels each other, and the left fixed plate gives the moving plate an upward electrostatic force, making the moving plate and the right fixed plate attract each other. Due to the staggered 1/2 electrode spacing, the moving plate moves upward by 1 while moving to the right. /2t.

Moment T3 (the end of sequence 3 and the start of sequence 4): the voltages on the electrode strips on the left and right fixed plates are commutated as shown in Figure 7, and the electrode strips U _a , U _b , U _c , U _d on the right fixed plate are respectively Change to negative voltage, zero voltage, positive voltage, zero voltage, and the electrode strips U _a1 , U _b1 , U _c1 , U _d1 on the left fixed plate change to positive voltage, zero voltage, negative voltage, and zero voltage; at this time, the moving plate and The right fixed plate repels each other, and the right fixed plate gives the moving plate an upward electrostatic force, making the moving plate and the left fixed plate attract each other. Due to the staggered 1/2 electrode spacing, the moving plate moves upward by 1 while moving to the left. /2t.

Time T4 (the end of sequence 4 and the start of sequence 5): the voltages on the electrode strips on the left and right fixed plates are commutated as shown in Figure 7, and the electrode strips U _a , U _b , U _c , U _d on the right fixed plate are respectively Change to zero voltage, negative voltage, zero voltage, positive voltage, and the electrode strips U _a1 , U _b1 , U _c1 , U _d1 on the left fixed plate change to negative voltage, zero voltage, positive voltage, and zero voltage; at this time, the moving plate and The left fixed plate repels each other, and the left fixed plate gives the moving plate an upward electrostatic force, making the moving plate and the right fixed plate attract each other. Due to the staggered 1/2 electrode spacing, the moving plate moves upward by 1 while moving to the right. /2t.

Time T5 (the end of sequence 5 and the start of sequence 6): the voltages on the electrode strips on the left and right fixed plates are commutated as shown in Figure 7, and the electrode strips U _a , U _b , U _c , U _d on the right fixed plate are respectively Change to zero voltage, negative voltage, zero voltage, positive voltage, and the electrode strips U _a1 , U _b1 , U _c1 , U _d1 on the left fixed plate change to negative voltage, zero voltage, positive voltage, and zero voltage; at this time, the moving plate and The right fixed plate repels each other, and the right fixed plate gives the moving plate an upward electrostatic force, making the moving plate and the left fixed plate attract each other. Due to the staggered 1/2 electrode spacing, the moving plate moves upward by 1 while moving to the left. /2t.

Time T6 (the end of sequence 6 and the start of sequence 7): the voltages on the electrode strips on the left and right fixed plates are commutated as shown in Figure 7, and the electrode strips U _a , U _b , U _c , U _d on the right fixed plate are respectively Change to zero voltage, positive voltage, zero voltage, negative voltage, and the electrode strips U _a1 , U _b1 , U _c1 , U _d1 on the left fixed plate change to zero voltage, negative voltage, zero voltage, and positive voltage; at this time, the moving plate and The left fixed plate repels each other, and the left fixed plate gives the moving plate an upward electrostatic force, making the moving plate and the right fixed plate attract each other. Due to the staggered 1/2 electrode spacing, the moving plate moves upward by 1 while moving to the right. /2t.

Moment T7 (the end of sequence 7 and the start of sequence 8): the voltages on the electrode strips on the left and right fixed plates are commutated as shown in Figure 7, and the electrode strips U _a , U _b , U _c , U _d on the right fixed plate are respectively Change to negative voltage, zero voltage, positive voltage, zero voltage, and the electrode strips U _a1 , U _b1 , U _c1 , U _d1 on the left fixed plate change to zero voltage, positive voltage, zero voltage, and negative voltage; at this time, the moving plate and The right fixed plate repels each other, and the right fixed plate gives the moving plate an upward electrostatic force, making the moving plate and the left fixed plate attract each other. Due to the staggered 1/2 electrode spacing, the moving plate moves upward by 1 while moving to the left. /2t.

Moment T8 (the moment when sequence 8 ends): the voltages on the electrode strips on the left and right fixed plates are reversed as shown in Figure 7. The electrode strips U _a , U _b , U _c , and U _d on the right fixed plate change to zero voltage, Positive voltage, zero voltage, negative voltage, the electrode strips U _a1 , U _b1 , U _c1 , U _d1 on the left fixed plate change to positive voltage, zero voltage, negative voltage, and zero voltage; at this time, the moving plate and the left fixed plate repel each other , the left fixed plate gives the moving plate an electrostatic force inclined upward, making the moving plate and the right fixed plate attract each other. Due to the staggered 1/2 electrode spacing, the moving plate moves upward by 1/2t while moving to the right. At this time, a voltage conversion cycle is completed, and the voltages U _a1 , U _b1 , U _c1 , U _d1 and U _a , U _b , U _c , U _d applied to the electrode strips on the left fixed plate and the right fixed plate return to the cycle The initial state is the same as T0 time.

The above is a voltage conversion cycle, and the moving plate moves upwards by a distance of 3t within a voltage conversion cycle. The voltage is continuously changed periodically, and finally the moving plate is continuously moved in one direction until it reaches the designated position. That is, the raised position of the contact shown in Figure 3 . At this time, all voltages are not changing, and the moving plate will be adsorbed on the left fixed plate or the right fixed plate. Due to the attraction of electrostatic force, the moving plate will be locked at the raised position of the contact and provide strong support.

In the same way, when the contact needs to be switched from the raised position to the lowered position (see Figure 3), the voltage applied to the electrode strips on the left fixed plate and the electrode strips on the right fixed plate is controlled to continuously change, so as to attract the moving plate to fall to Specify the location, and finally realize the drop of the braille contact through the connecting rod.

In addition, the height standard of Braille bumps is 0.2~0.5mm. Different people have different touch habits. People who are more skilled in reading are accustomed to a higher height of Braille contacts. According to the touch habits of different blind people, you can set the left and right fixed boards. The cycle number of the voltage conversion cycle of the electrode strip controls the limit position of the Braille contact moving up.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention. Any modification, equivalent replacement or improvement made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.

Claims (14)

1. An electrostatically driven braille point display device, characterized in that: it comprises a housing, a touch panel is provided on the top of the housing, a braille contact is movable on the touch panel, and an electrostatic drive assembly is provided at the bottom of the housing, The electrostatic drive assembly includes a right fixed plate and a left fixed plate fixedly connected to the housing, a movable plate is provided between the right fixed plate and the left fixed plate, and the movable plate is fixedly connected with the Braille contacts , the right fixed plate and the left fixed plate drive the moving plate to move up and down through a periodic electrostatic field. 2. A kind of electrostatically driven Braille display device as claimed in claim 1, characterized in that: said right fixed plate and left fixed plate are provided with several drive electrodes, said right fixed plate and said left fixed plate The driving electrodes on the plate are arranged alternately up and down, and the moving plate is provided with several moving plate electrodes, and the driving electrodes periodically attract the moving plate electrodes to control the moving plate to move between the right fixed plate and the left fixed plate. 3. An electrostatically driven Braille display device as claimed in claim 1, characterized in that: the bottom of the housing is provided with a mounting plate, the mounting plate is provided with a fixing slot, the right fixed plate and the left The fixed plate is fixedly installed in the card slot, and the side of the housing is provided with a protective plate, and both the mounting plate and the protective plate are made of insulating materials. 4 . The electrostatically driven Braille display device according to claim 1 , wherein the moving plate and the Braille contacts are fixedly connected by a connecting rod, and the connecting rod is made of spring steel. 5 . 5 . The electrostatically driven Braille display device according to claim 1 , wherein the Braille contacts on the touch panel are made of insulating light materials and are hemispherical. 6 . 6. The electrostatically driven braille point display device according to claim 1, wherein there is a gap between the braille contact and the mounting hole for installing the braille contact on the touch panel, and the There is a gap between the moving plate and the right fixed plate and the left fixed plate, and the size of the gap is the same. 7. An electrostatically driven Braille display device according to claim 2, characterized in that: the right fixed plate and the left fixed plate comprise an insulating base and driving electrodes, and the driving electrodes are elongated and arranged horizontally , the driving electrodes are divided into several groups, and each group of driving electrodes includes at least four electrode strips, and the electrode strips are sequentially numbered 1, 2, ... n, and the electrode strips with the same number in each group of driving electrodes are connected in parallel, and The power supply voltage is the same. 8. An electrostatically driven Braille display device as claimed in claim 7, characterized in that: said moving plate comprises an insulating base and moving plate electrodes, said moving plate electrodes are elongated and arranged horizontally, said The moving plate electrodes are divided into several groups, and each group of moving plate electrodes is provided with at least two electrode strips, and the electrode strips are numbered 1, 2, ... m in turn, and the electrode strips with the same number in each group of moving plate electrodes are connected in parallel, And the power supply voltage is the same. 9. An electrostatically driven Braille display device as claimed in claim 8, characterized in that: the insulating substrate is made of polyimide material, the dielectric constant is greater than 4.0, and the dielectric loss is between 0.004 and 0.007 Between, the driving electrode and the moving plate electrode are made of copper foil, and are prepared by chemical etching or flexible processing. 10. A kind of electrostatically driven Braille display device as claimed in claim 2, characterized in that: the distance between the driving electrodes on the right fixed plate and the left fixed plate is the same, the distance is expressed as t, and the right fixed plate The up and down stagger distance of the drive electrodes on the plate and the left fixed plate is 0.5t, and the distance between the electrodes on the moving plate on the moving plate is consistent and 2t. 11. An electrostatically driven braille display method, characterized in that: comprising the steps of: S1: Place the moving plate connected with the Braille contact between the left and right fixed plates, and several electrode strips are arranged on the moving plate and the left and right fixed plates; S2: Provide positive and negative normal voltages to the adjacent electrode strips on the moving plate; S3: Control the voltage of the electrode strips on the left and right fixed plates to change periodically, control the left and right fixed plates to adsorb the moving plate alternately in turn, control the moving plate to move up and down through electrostatic adsorption, and drive the Braille contacts to move up and down. 12. An electrostatically driven Braille point display method as claimed in claim 11, characterized in that: the moving plate can slide up and down between the left and right fixed plates, and the plurality of electrode strips on the left and right fixed plates Arranged staggered up and down, the distance between the electrode strips on the right fixed plate and the left fixed plate is the same, the distance is expressed as t, the vertical stagger distance of the electrode strips on the right fixed plate and the left fixed plate is, the electrode strips on the moving plate The spacing between electrode strips is consistent and 2t. 13. A kind of electrostatically driven Braille pointing method as claimed in claim 11, characterized in that: said step S3 comprises the following sub-steps: S31: Provide voltage to the electrode strips on the left and right fixed plates, and control the moving plate to be adsorbed on one of the fixed plates; S32: Change the voltage of the electrode strips on the fixed plate that is adsorbed to the moving plate, so that the fixed plate gives the moving plate an upward or downward force, so that the moving plate is adsorbed on another fixed plate, and completes upward or downward down displacement; S33: According to step S32, the voltage of the electrode strips on the fixed plate is periodically changed, so that the movable plate moves a longer distance between the left and right fixed plates, and the Braille contacts connected with the movable plate move up or down to a designated position. 14. An electrostatically driven Braille pointing method as claimed in claim 13, characterized in that: the limit position of the upward movement of the Braille contact in the step S33 is adjusted by setting the cycle number of the voltage of the electrode strip on the fixed plate .

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