CN103513836A - Alignment identification method of low-color-difference touch panel - Google Patents

Abstract

An alignment identification method for a low color difference touch panel, the low color difference touch panel comprising: the alignment identification method comprises the following steps of: irradiating the touch sensor and the object to be bonded which are not overlapped by using a luminous source capable of emitting infrared light; (b) utilizing an alignment identifier with an infrared detection function to respectively detect infrared light penetrating through a touch sensor and an object to be attached, and respectively identifying the positions of the first alignment pattern and the second alignment pattern to send out a positioning signal; and (c) relatively moving the touch sensor or the object to be attached according to the positioning signal to overlap the first alignment pattern and the second alignment pattern. By utilizing the difference of the infrared light penetration rate, the first alignment graph and the second alignment graph are easy to identify, the accuracy of alignment and bonding is improved, and the production yield can be improved.

Description

Alignment identification method for low color difference touch panel

technical field

The invention relates to an alignment identification method, in particular to an alignment identification method for detecting a low color difference touch panel.

Background technique

A general capacitive touch panel includes: a substrate and a transparent conductive film formed on the substrate.

When manufacturing the touch panel, a transparent conductive material is coated on the surface of the substrate to form the transparent conductive film, and then undergoes a lithography process, and the transparent conductive film is etched to produce a sense that a plurality of conductive materials are retained. alignment pattern, and at least one alignment pattern in which the conductive material is etched away. The alignment pattern is set to be laminated with the object to be bonded in the subsequent process. For example, to align and bond the touch panel with a photomask, it is necessary to use an alignment detector to detect the position of the transparent conductive film. Align the pattern to confirm the position, and then move the mask to align it with the touch panel.

In recent years, various technologies for reducing the visual chromatic aberration of the touch panel have emerged. Although the etching marks of the transparent conductive film can be made inconspicuous and the fineness of the touch panel can be improved, such technologies make the transparent conductive film The light transmittance of the etched area and the reserved area of the conductive film are very close in the visible light band. In other words, the existing alignment identifier cannot effectively identify the etched area and the retained area of the transparent conductive film. The reserved area, that is, the alignment pattern becomes difficult to be observed, so it is difficult to grasp the correct position of the touch panel, which becomes a difficult problem to be overcome in the manufacturing process.

Contents of the invention

The purpose of the present invention is to provide an alignment recognition method for a low color difference touch panel that is easy to align.

The alignment identification method of the low color difference touch panel of the present invention, the low color difference touch panel includes: a touch sensor, and an object to be bonded. The touch sensor includes a substrate and a transparent conductive film formed on the substrate. The transparent conductive film has a first alignment pattern, and the object to be pasted has a second alignment pattern, and the infrared light transmittances of the first alignment pattern and the second alignment pattern are respectively different from those of the transparent Infrared light transmittance between other areas of the conductive film and other areas of the object to be bonded.

The alignment identification method includes the following steps:

(a) Utilizing a light emitting source capable of emitting infrared light to irradiate the unstacked touch sensor and the object to be bonded;

(b) Using an alignment recognizer with an infrared light detection function to respectively detect the infrared light penetrating the touch sensor and the object to be bonded, and respectively identify the first alignment pattern of the transparent conductive film and the position of the second alignment pattern of the object to be attached to send a positioning signal; and

(c) relatively moving the touch sensor or the object to be attached according to the positioning signal, so that the first alignment pattern and the second alignment pattern overlap.

The alignment identification method of the low color difference touch panel of the present invention also includes the following steps:

(d) The alignment recognizer sends a confirmation signal after the first alignment pattern and the second alignment pattern overlap each other, and according to the confirmation signal, the object to be bonded and the touch sensor are laminated on the Together.

According to the alignment identification method of the low-chromatic-difference touch panel of the present invention, the infrared light wavelength range that the alignment identifier can detect in the step (b) is 700 nanometers to 3000 nanometers.

The alignment identification method of the low color difference touch panel of the present invention, the step (a) and the step

The step (b) further includes the following step (e): attaching a near-infrared light filter to the alignment identifier, so that the wavelength of the transmitted light is limited to 750 nm to 1000 nm or 900 nm to 1700 nm.

The beneficial effect of the present invention is that: utilizing the difference in infrared light transmittance, the first alignment pattern and the second alignment pattern are easily identified, which helps to increase the accuracy of alignment and bonding, thereby improving Production yield.

Description of drawings

Fig. 1 is a three-dimensional exploded view showing a touch sensor of a low-chromatic aberration touch panel and an object to be attached, the object to be attached is another touch sensor;

FIG. 2 is a partial cutaway side view illustrating the low color difference touch panel and an alignment identifier;

FIG. 3 is an experimental graph illustrating the transmittance of different wavelength bands of light penetrating the touch sensor;

FIG. 4 is a partial schematic diagram illustrating a picture of the alignment recognizer observing a first alignment pattern of the touch sensor;

FIG. 5 is a flow chart illustrating an implementation process of the alignment identification method of the low-chromatic-difference touch panel of the present invention;

FIG. 6 is a flow chart illustrating another implementation process of the alignment identification method of the low-chromatic-difference touch panel of the present invention;

Fig. 7 is a three-dimensional exploded view showing the touch sensor and the object to be attached, the object to be attached is a photomask;

FIG. 8 is a partial cutaway side view illustrating the low color difference touch panel and the alignment identifier;

FIG. 9 is a partial schematic diagram illustrating a plurality of first sensing patterns, a plurality of second sensing patterns, and a plurality of bridge lines of the touch sensor.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

Referring to Fig. 1 and Fig. 2, a preferred embodiment of the alignment identification method of the low color difference touch panel of the present invention is to use an alignment identifier 3 with an infrared light detection function and an infrared light source to apply to a low The inspection and alignment process during the manufacture of the color difference touch panel, the low color difference touch panel includes: a touch sensor 1 and a material 2 to be bonded.

The touch sensor 1 includes: a substrate 11, a piece of anti-reflection film 12 formed on the surface of the substrate 11, a piece of transparent conductive film 13 formed on the side of the anti-reflection film 12 away from the substrate 11, and a piece deposited on The transparent conductive film 13 and the anti-reflection film 12 are respectively away from the insulating film 14 on one side of the substrate 11 . In this preferred embodiment, the substrate 11 is made of high-hardness and transparent glass, but the substrate 11 can also be made of other materials according to product requirements, such as a flexible plastic film. The antireflection film 12 is formed by laminating a silicon oxide (SiO ₂ ) film and a niobium oxide (Nb ₂ O ₅ ) film, but it is not limited to this material during implementation, and the antireflection film 12 should not be regarded as The necessary structure of the applicable object, that is to say, the touch sensor 1 does not necessarily have the anti-reflection film 12 , and the related reasons will be described later. The transparent conductive film 13 is made of transparent conductive oxide (TCO, Transparent Conductive Oxide), generally made of indium tin oxide (ITO), but it can also be aluminum-doped zinc oxide (AZO), gallium-doped zinc oxide ( GZO), or other transparent and conductive materials, the transparent conductive film 13 has previously undergone a lithographic etching process, thus forming a first alignment pattern 131 in which the transparent conductive oxide is etched away, and the transparent conductive oxide A plurality of first sensing patterns 132 are retained. The insulating film 14 is located between the transparent conductive film 13 and the object 2 to be bonded, and is used to isolate the charge flow between the transparent conductive film 13 and the object 2 to be bonded.

In this preferred embodiment, the object 2 to be bonded is another touch sensor corresponding to the aforementioned touch sensor 1, so it also includes: a substrate 21, an anti-reflection film 22, and a transparent conductive film 23, but does not include the aforementioned insulating film 14. The transparent conductive film 23 of the object to be bonded 2 faces the insulating film 14 of the touch sensor 1, and also forms a second alignment pattern 231 in which the transparent conductive oxide is etched away, and a plurality of transparent conductive films. The second sensing pattern 232 in which the oxide is retained. The first sensing pattern 132 and the second sensing pattern 232 cooperate with each other to generate induced charges during touch operation, but since the sensing principle and pattern distribution are not the focus of the present invention, they will not be described in detail here.

Referring to Figure 2, Figure 3, and Figure 4, it should be noted that since the low-chromatic-difference touch panel is provided with the anti-reflection films 12, 22 respectively, the areas where the transparent conductive films 13, 23 are etched and are retained The light transmittance of the region is very close in the visible light band. In other words, the first alignment pattern 131 and the second alignment pattern 231 are very difficult to observe through visible light, and it is not easy to use the first The alignment pattern 131 and the second alignment pattern 231 serve as a positioning reference. In addition, even if the anti-reflection film 12, 22 is not provided, it is possible to achieve the effect of reducing the color difference by changing the material or structure of the transparent conductive film 13, 23, for example, using a plurality of imitation textures to reduce the structural improvement of the color difference , it will also make the first alignment pattern 131 and the second alignment pattern 231 difficult to be observed, which will affect their recognition when used for alignment.

However, the light transmittance of the etched area and the reserved area of the transparent conductive film 13, 23 is significantly different in the infrared light band, that is to say, the first alignment pattern 131 and the second alignment pattern 131 The infrared light transmittance of the quasi-pattern 231 is different from the infrared light transmittance of other regions of the transparent conductive film 13 and other regions of the transparent conductive film 23 respectively, so the present invention utilizes this characteristic to make the first pair The alignment pattern 131 and the second alignment pattern 231 can be identified. In this embodiment, the lens of the alignment identifier 3 has a detection range 31, and an alignment reticle 311 is formed in the detection range 31, and the alignment identifier 3 is used to observe the alignment pattern formed on the transparent conductive film 13. The first alignment pattern 131, it can be clearly seen that the first alignment pattern 131 is in the shape of a cross, and the lens of the alignment identifier 3 is moved until the alignment cross line 311 overlaps with the first alignment pattern 131 , the position coordinates of the first alignment pattern 131 can be confirmed.

In this preferred embodiment, the number of the first alignment pattern 131 and the number of the second alignment pattern 231 is one, but in practice, the number can also be two or more, for larger area or Higher precision alignment.

Referring to Fig. 2 and Fig. 5, the alignment identification method of the present invention includes the following steps.

Firstly, as shown in step 41 , a light emitting source capable of emitting infrared light is used to irradiate the unstacked touch sensor 1 and the object 2 to be bonded. For example, an incandescent light bulb or a fluorescent tube is used to irradiate the unstacked touch sensor 1 and the object 2 in the light direction shown by the arrow in FIG. 2 .

Then, as shown in step 42, an alignment recognizer 3 with infrared light detection function is used to respectively detect the infrared light penetrating the touch sensor 1 and the object 2 to be bonded, and respectively identify the transparent The position of the first alignment pattern 131 of the conductive film 13 and the second alignment pattern 231 of the object 2 to be bonded sends out a positioning signal. For example, using the alignment identifier 3 to detect the light transmittance in the wavelength range of 700 nanometers to 3000 nanometers, respectively judge the coordinates of the first alignment pattern 131 and the second alignment pattern 231, and calculate the The positioning signal is sent after the difference in coordinates.

Next, as shown in step 43 , the touch sensor 1 or the object to be bonded 2 is moved according to the positioning signal, so that the first alignment pattern 131 overlaps the second alignment pattern 231 . For example, the positioning signal shows that the first alignment pattern 131 is located 0.5 mm to the right of the second alignment pattern 231, so the substrate 11 is relatively moved to the left by 0.5 mm, or the object to be bonded 2 is relatively moved Move to the right by 0.5 mm, or move the substrate 11 and the object 2 to the left and right by 0.25 mm.

Finally, as shown in step 44, the alignment recognizer 3 sends a confirmation signal after the first alignment pattern 131 and the second alignment pattern 231 overlap each other, and according to the confirmation signal, the object 2 to be pasted and the The touch sensors 1 are stacked together. For example, the alignment recognizer 3 detects that the coordinates of the first alignment pattern 131 and the second alignment pattern 231 are the same, that is, the first alignment pattern 131 and the second alignment pattern 231 have been aligned. overlap each other, so the confirmation signal is sent out, and then according to the confirmation signal, the touch sensor 1 and the object 2 to be bonded are stacked together, and the alignment and bonding actions are completed at this time.

Referring to FIG. 2 and FIG. 6 , step 42 can also be modified into step 51 and step 52 in the alignment identification method of the present invention. As shown in step 51, attach a near-infrared light filter that can limit the transmission wavelength to 750 nm to 1000 nm or 900 nm to 1700 nm to an alignment identifier 3, and then as shown in step 52, use The alignment recognizer 3 respectively detects the infrared light penetrating the touch sensor 1 and the object to be bonded 2, and recognizes the first alignment pattern 131 of the transparent conductive film 13 and the object to be bonded 2 respectively. The position of the second alignment pattern 231 can send out a positioning signal. For example, adding a near-infrared light filter with a transmission wavelength limited to 750 nanometers to 1000 nanometers to the lens of the alignment identifier 3 can further limit the infrared light wave band that the alignment identifier 3 can detect, and Improve the accuracy of alignment recognition.

Referring to FIG. 7 , FIG. 8 , and FIG. 9 , when the alignment recognition method of the present invention is implemented, it is not only applicable to the case where the object 2 to be bonded is another touch sensor. For example, it is also applicable to the alignment and positioning of a low color difference touch panel and a photomask, that is to say, the transparent conductive film 13 of the touch sensor 1 has the first sensing pattern 132 and the second sensing pattern 132. measuring pattern 232, and the object 2 to be bonded is a photomask with the second alignment pattern 231 and a plurality of bridging holes 234. Based on the principle of capacitive touch sensing, the first sensing pattern 132 cannot be matched with the first sensing pattern 132. The second sensing pattern 232 touches, and a plurality of insulating films 14 distributed between the adjacent first sensing pattern 132 and the second sensing pattern 232 are used as isolation, but the second sensing pattern located in the same row 232 need to be electrically connected to each other by a plurality of bridge wires 233 . Therefore, in the manufacturing process of a low-chromatic-difference touch panel with a single substrate, it is necessary to irradiate infrared light along the direction indicated by the arrow in FIG. After aligning and stacking the object 2 in the form of a photomask, the bridging lines 233 can be respectively plated between the second sensing patterns 232 according to the positions of the bridging holes 234 .

Alternatively, the alignment recognition method of the present invention can also be applied to the alignment and positioning of the touch sensor 1 and a surface glass (not shown) having the second alignment pattern 231, that is to say, the to-be-bonded The object 2 is a surface glass for attaching on the surface of the touch sensor 1 .

To sum up, the alignment identification method of the low-chromatic-difference touch panel of the present invention can accurately identify the first alignment pattern 131 and the second alignment pattern 231 with infrared light, so that the touch sensor can 1 can be correctly aligned with the object to be bonded 2 and laminated together, and no matter whether the object to be bonded 2 is another touch sensor, a photomask, or a surface glass, its manufacturing process is applicable demand, and can greatly improve production yield and product quality, so the effect of the present invention can indeed be achieved.

Claims (4)

1. A method for alignment identification of a low-chromatic-difference touch panel, the low-chromatic-difference touch panel comprising: a touch sensor, and an object to be bonded, the touch sensor comprising a substrate, and a forming The transparent conductive film on the substrate, the transparent conductive film has a first alignment pattern, the object to be pasted has a second alignment pattern, and the infrared light passing through the first alignment pattern and the second alignment pattern The transmittance is different from the infrared light transmittance of other regions of the transparent conductive film and other regions of the object to be bonded respectively, and is characterized in that: The alignment identification method includes the following steps: (a) using a light emitting source capable of emitting infrared light to irradiate the unstacked touch sensor and the object to be bonded; (b) using an infrared light detection function The alignment recognizer detects the infrared light penetrating the touch sensor and the object to be attached respectively, and recognizes the first alignment pattern of the transparent conductive film and the second alignment of the object to be attached and (c) relatively moving the touch sensor or the object to be attached according to the positioning signal, so that the first alignment pattern and the second alignment pattern overlap. 2. The alignment identification method of a low-chromatic-difference touch panel according to claim 1, characterized in that: the alignment identification method further comprises the following steps: (d) the alignment identifier uses the first alignment pattern and A confirmation signal is sent out after the second alignment patterns overlap each other, and the object to be pasted and the touch sensor are stacked together according to the confirmation signal. 3 . The method for identifying alignment of a low-chromatic-difference touch panel according to claim 1 , wherein the wavelength range of infrared light detectable by the alignment identifier in the step (b) is 700 nm to 3000 nm. 4 . 4. The alignment identification method of a low-chromatic-difference touch panel according to claim 1, characterized in that: the step (a) and the step (b) also include the following steps: (e) adding a near-infrared filter The light sheet is placed on the alignment identifier to limit the wavelength of the transmitted light to 750 nm to 1000 nm or 900 nm to 1700 nm.

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