CN104679316B - touch display device - Google Patents

Abstract

A touch display device comprises: a display device; and a touch panel arranged on one side of the display device, wherein the touch panel comprises: a substrate; a light shielding layer arranged between the substrate and the display device; and a circuit layer arranged between the light shielding layer and the display device, the circuit layer comprising: a first signal electrode, the first signal electrode having a first overlapping area and a first non-overlapping area; and a second signal electrode, the second signal electrode having a second overlapping area and a second non-overlapping area; wherein the first overlapping area and the second overlapping area overlap with the light shielding layer, and the spacing between the first overlapping area and the second overlapping area is greater than the spacing between the first non-overlapping area and the second non-overlapping area.

Description

touch display device

technical field

The present invention relates to a touch display device, in particular to a touch display device capable of preventing internal static electricity from damaging a black matrix.

Background technique

In recent years, with the development trend of humanization and simplification of operation, touch display devices with touch panels are more and more widely used in production and life. Since the user can input signals by directly touching the touch display device with hands or other objects, thereby reducing or even eliminating the user's dependence on other input devices (such as keyboard, mouse, remote control, etc.), which greatly facilitates the user's operation.

Touch panel technology can be divided into different types based on three aspects: signal generation principle, sensing technology, and screen assembly method. Depending on the principle of signal generation, it can be divided into digital and analog: digital touch signals use transparent ITO (Indium Tin Oxide; Indium Tin Oxide) conductive film, and distribute wires on the transparent conductive glass along the X and Y axes , a switch is formed at the intersection of the lines, and the touch signal is sensed when pressed; the difference between the analog touch principle and the digital touch is that there is a dot spacer between the upper and lower layers, and the upper and lower electrodes are connected after touching. The signal of potential difference is generated, and then the signal is sent to the controller through the circuit to process and calculate the coordinate position of the touch point. Furthermore, touch panel technology can be divided into electrical signals (including resistive, capacitive, electromagnetic, etc.), optical signals (including infrared, etc.), and acoustic signals ( Including surface acoustic wave, acoustic waveguide, dispersion signal, acoustic pulse, etc.).

However, during the manufacturing process of the touch panel, the temperature of the post-production process will cause carbonization of the black matrix (BM) material, resulting in a decrease in the resistance of the black matrix and slight conductivity. In this case, in the electrode region, the portion with a smaller surface curvature radius or sharp corners, that is, a narrower portion, has a higher charge density and electric field strength. Therefore, when the charge continues to accumulate and a large voltage difference is formed, it will cause electrostatic discharge (ESD) and damage the black matrix, eventually causing in-plane light leakage or short circuit problems.

Therefore, there is an urgent need to develop a touch display device that avoids a design with a small surface curvature radius or sharp corners in the electrode area, so as to prevent the black matrix from being damaged by static electricity during the manufacturing process.

Contents of the invention

The purpose of the present invention is to provide a touch display device, which can prevent the black matrix from being damaged by static electricity due to charge accumulation on the surface with a small curvature radius or sharp corners during the manufacturing process of the touch panel.

To achieve the above object, the touch display device provided by the present invention includes: a display device; and a touch panel disposed on one side of the display device, wherein the touch panel includes: a substrate; a light-shielding layer , arranged between the substrate and the display device; and a circuit layer, arranged between the light-shielding layer and the display device, the circuit layer includes: a first signal electrode, the first signal electrode has a first layer overlapping area and a first non-overlapping area; and a second signal electrode, the second signal electrode has a second overlapping area and a second non-overlapping area; wherein the first overlapping area and the second The overlapping area overlaps with the light shielding layer, and the distance between the first overlapping area and the second overlapping area is greater than the distance between the first non-overlapping area and the second non-overlapping area.

Accordingly, in the touch display device of the present invention, compared with the conventional touch panel, because the spacing between the overlapping regions in the touch panel of the present invention is designed to be larger, the charges on the electrode regions will be evenly dispersed, making it difficult for charges to gather In a specific area, the phenomenon of electrostatic damage during the manufacturing process of the touch panel is prevented, and the yield rate of the manufacturing process is improved.

Description of drawings

FIG. 1 is a schematic diagram of a touch panel according to an embodiment of the present invention.

FIG. 2 is an enlarged view of the corner area of FIG. 1 .

FIG. 3 is a partially enlarged view of FIG. 2 .

4A and 4B are partial enlarged views of FIG. 3 .

FIG. 4C is a schematic diagram of another implementation of FIG. 4A .

Fig. 5 is a cross-sectional view of line a-b in Fig. 4A.

FIG. 6 is a schematic diagram of a touch display device according to an embodiment of the present invention.

FIG. 7 is a partial enlarged view of the touch display device of the control group.

Explanation of main component symbols in the attached drawings:

100 touch panel, 111 first signal electrode, 111A first non-overlapping area, 111A1 edge of first non-overlapping area, 200 display device, 300 touch display device;

1 Sensing area, 11 Circuit layer, 111B first overlapping area, 111B1 edge of first overlapping area, 111C first connecting area, 112 second signal electrode, 112A second non-overlapping area, 112A1 second non-overlapping area Area edge, 112B second overlapping area, 112B1 second overlapping area edge, 112C second connection area, 113 dummy electrode, 114 opening area, 114A one end of the opening area, 114B the other end of the opening area;

2 edge area, 3 frame, 4 wiring area;

10 substrate, 101 touch surface, 20 optical film layer, 21 light-shielding layer, 30 protective layer;

d1, d2, d6 spacing, d3, d5 width, d4 extension distance, d7 length, x gap width direction, y gap length direction.

detailed description

The implementation of the present invention is illustrated by specific examples below, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. In addition, the present invention can also be implemented or applied by other different specific embodiments, and various modifications and changes can be made without departing from the spirit of the present invention.

Example

FIG. 1 is a schematic diagram of a touch panel according to an embodiment of the present invention. As shown in FIG. 1 , the touch panel 100 is divided into a sensing area 1 , an edge area 2 , a frame 3 and a wiring area 4 . The enlarged view of the corner area of the panel (circled by a dotted circle) is shown in FIG. 2 . Referring to FIG. 2, the circuit layer 11 of the touch panel 100 includes a first signal electrode 111, a second signal electrode 112, and a dummy electrode 113, and the circuit layer 11 is disposed above the light-shielding layer 21, wherein the corner area (circled by a dotted circle) 3 ; the enlarged view of the partial area of the first signal electrode 111 and the second signal electrode 112 in FIG. 3 (circled by the dotted circle) is shown in FIG. 4A .

4A, the first signal electrode 111 includes a first non-overlapping region 111A and a first overlapping region 111B, the second signal electrode 112 includes a second non-overlapping region 112A and a second overlapping region 112B, and the first overlapping The overlapping area 111B and the second overlapping area 112B correspond to the light shielding layer 21, and the distance d2 between the first overlapping area 111B and the second overlapping area 112B is greater than that between the first non-overlapping area 111A and the second non-overlapping area 112A. distance d1. For example, the distance d1 between the first non-overlapping region 111A and the second non-overlapping region 112A is generally about 30 microns, and the distance d2 between the first overlapping region 111B and the second overlapping region 112B can be the first non-overlapping region 112B. 1.5 to 10 times the distance d1 between the overlapping region 111A and the second non-overlapping region 112A, preferably 2 to 5 times; or, when the distance between the first non-overlapping region 111A and the second non-overlapping region 112A When the distance d1 varies according to the size of the touch panel or specific requirements, the distance d2 between the first overlapping region 111B and the second overlapping region 112B can be 40 to 300 microns, preferably 60 to 100 microns. Here, in FIG. 4A and FIG. 4B, the x and y directions are based on the gap between the first non-overlapping region 111A and the second non-overlapping region 112A, the gap width direction is x, and the gap length direction is y; and The x and y directions are perpendicular to each other.

Moreover, FIG. 4A also shows that between the first non-overlapping area 111A and the second non-overlapping area 112A, and between the first overlapping area 111B and the second overlapping area 112B may further include: an opening area 114, an opening area A part of 114 corresponds to the light-shielding layer 21 , and the parts corresponding to and not corresponding to the light-shielding layer 21 are not particularly limited, and the area ratio of the two can be appropriately adjusted by those skilled in the art. Wherein, the width d3 of the gap between the opening region 114 in the first non-overlapping region 111A and the second non-overlapping region 112A in the direction y (that is, the first and second non-overlapping regions 111A, 112A and the first and second non-overlapping regions 111A, 112A and the first and second The distance between the two overlapping regions 111B, 112B in the opening region 114) can be 0.2 to 2 times the distance d1 (generally about 30 microns) between the first non-overlapping region 111A and the second non-overlapping region 112A, or The width d3 may be 0.6 to 60 micrometers; but the present invention is not limited thereto. In addition, the opening area 114 extends from one side of the first and second overlapping areas 111B, 112B toward a direction, which is the gap width direction x of the first and second non-overlapping areas 111A, 112A, and extends for a distance d4 It can be 3 to 10 times the distance d1 (generally about 30 micrometers) between the first and second non-overlapping regions 111A, 112A, or the distance d4 can be 100 to 1000 micrometers; but the invention is not limited thereto. Detailed description: the distance d4 of the opening area 114 extending from one side of the first overlapping area 111B toward the direction x is the distance from the side of the first overlapping area 111B to one side 114A of the opening area 114, the opening area 114 The side 114A is located between the first non-overlapping area 111A and the first overlapping area 111B; similarly, the distance d4 extending from the side of the second overlapping area 112B toward the direction x, that is, The distance from this side of the second overlapping area 112B to the other side 114B of the opening area 114, the other side 114B of the opening area 114 is corresponding to the side 114A and located in the second non-overlapping area 112A and the second overlapping area Between 112B. In the case of setting the opening area 114, the length d7 of the opening area 114 can be measured, which should be about twice the distance of d4 (that is, one side of the first overlapping area 111B and one side of the second overlapping area 112B respectively The sum of the distance d4 extending in the direction x and the distance d2 between the first and second overlapping regions 111B, 112B.

FIG. 4B is the same partial enlarged view of FIG. 3 as FIG. 4A . As shown in FIG. 4B, the first non-overlapping region 111A has a first non-overlapping region edge 111A1, the second non-overlapping region 112A has a second non-overlapping region edge 112A1, and the first overlapping region 111B has a first overlapping The overlapping region edge 111B1, and the second overlapping region 112B has a second overlapping region edge 112B1. In FIG. 4B, the edge 111A1 of the first non-overlapping region, the edge 112A1 of the second non-overlapping region, the edge 111B1 of the first overlapping region, and the edge 112B1 of the second overlapping region are all represented by thick black lines. separated by dotted lines. Wherein, the shortest distance between the edge 111B1 of the first overlapping area and the edge 112B1 of the second overlapping area is greater than the shortest distance between the edge 111A1 of the first non-overlapping area and the edge 112A1 of the second non-overlapping area, but the present invention is not limited by limited to this.

Alternatively, please refer to FIG. 4C , which is a schematic diagram of another implementation of FIG. 4A . 4C, the first signal electrode 111 includes a first non-overlapping region 111A and a first overlapping region 111B, and may further include a first connection region 111C disposed therebetween, and the second signal electrode 112 includes a second non-overlapping region 111B. The overlapping region 112A and the second overlapping region 112B may further include a second connecting region 112C disposed therebetween. The width d5 of the first and second connecting regions 111C, 112C in the gap length direction y of the first and second non-overlapping regions 111A, 112A (that is, the first and second non-overlapping regions 111A, 112A and the first and the second overlapping regions 111B, 112B) are not limited, preferably 0.1 to 1 times the distance d1 (generally about 30 microns) between the first and second non-overlapping regions 111A, 112A, Alternatively the width d5 may be 0.3 to 30 microns. In addition, the distance d6 between the first and second connecting regions 111C, 112C is not limited, for example, the distance d6 can preferably be defined the same as the distance d2 between the first and second overlapping regions 111B, 112B. In the embodiment shown in FIG. 4C , the definitions of the distances d1 and d2 are the same as those described in FIG. 4A .

According to the two implementations of Figure 4A and Figure 4C, the distance d2 between the first and second overlapping regions 111B, 112B is greater than the distance d1 between the first and second non-overlapping regions 111A, 112A, in the electrode region Avoiding the design with a small edge curvature radius can make the charges evenly dispersed and not easy to gather in a specific area, and because the electrostatic force will be inversely proportional to the square of the distance, the electrostatic force will be reduced and the electrostatic discharge phenomenon will be reduced. Therefore, the distance d2 is greater than the distance d1 It can effectively prevent the black matrix from being damaged by static electricity during the manufacturing process, and improve the process yield.

Fig. 5 is a cross-sectional view of line a-b in Fig. 4A. Please refer to FIG. 5 , the touch panel according to the embodiment of the present invention includes in order from the touch surface 101 : a substrate 10 , a light-shielding layer 21 , an optical film layer 20 , a circuit layer 11 , and a protection layer 30 . Due to the height difference formed by the light-shielding layer 21, the film layer coated on the light-shielding layer 21 will have uneven thickness at the height difference, and it is easy to make the first signal electrode 111 and the second signal electrode 112 conduct and short circuit occurs. ; Therefore, in the state where the circuit layer 11 includes the opening region 114, the distance between the first signal electrode 111 and the second signal electrode 112 is far away, thereby avoiding the occurrence of the above-mentioned short circuit. Therefore, the purpose of disposing the optical thin film layer 20 is generally to make the pattern of the touch electrode (ie, the circuit layer 11 ) difficult for the user to perceive, and it can be disposed according to actual needs, and can be omitted if not needed. Generally speaking, the substrate 10 can be a glass substrate, the material of the light-shielding layer 21 can be carbon black, the material of the optical film layer 20 can be silicon oxynitride (SiOxNy), the material of the circuit layer 11 can be indium tin oxide (ITO), and the protection The layer 30 can be an acrylic material; however, the invention is not limited thereto.

The touch display device of the present invention is shown in FIG. 6 , which is a schematic diagram of the above touch panel 100 applied to a display device 200 . For ease of illustration, the actual structure of the touch panel 100 (ie, the substrate 10 , the light-shielding layer 21 , the optical film 20 , the wiring layer 11 , and the protection layer 30 in FIG. 5 ) is omitted in FIG. 6 . The touch display device 300 includes: a display device 200 ; and a touch panel 100 disposed on one side of the display device 200 ; the user views the touch display device 300 from the touch surface 101 . In short, the touch panel 100 can be applied to any device that requires a touch panel, without any particular limitation, and the display device 200 can be various flat displays, such as liquid crystal displays, organic light emitting diode displays, or electronic paper displays, etc. ; Practical applications such as: car displays, electromagnetic isolation glass, mobile phones, solar cells, portable LCD video games, home appliances LCD panels, instrument displays, organic light-emitting diode displays, liquid crystal displays, notebook computers, liquid crystal electric, plasma displays , electrodes for color filters or a combination of the above, etc.

test case

A 13.3-inch touch display device was used for testing, wherein the touch display device of the experimental group was as described in the embodiment of Figure 4A, wherein the distance d1 between the first and second non-overlapping regions 111A, 112A was about 30 microns, The distance d2 between the first and second overlapping regions 111B, 112B is about 60 microns, about half of the area of the opening region 114 is corresponding to the lower light shielding layer 21, and the opening region 114 is in the first and second non-overlapping regions 111A, 112A The distance d3 in the length direction of the gap is about 60 microns, and the distance d4 extending from one side of the first and second overlapping regions 111B, 112B toward the x direction is about 100 microns. In addition, referring to FIG. 7 , the touch display device of the control group is the same as that of the experimental group except that the distance d2 between the first and second overlapping regions 111B and 112B is about 30 microns.

Please refer to Figure 1 and Figure 2 together, use an electrostatic gun (specification: 1.5KΩ/100pF) to directly contact the circuit layer 11 of the sensing area 1, and conduct an electrostatic discharge tolerance test. The voltage intensity of the test gradually increases from ±0.5V to ±1V, and it needs to be discharged after each contact to prevent the accumulation of charges; . The ESD tolerance test results are summarized in Table 1 below.

Table 1

touch display device Fail Voltage test group +11KV control group +4KV

Accordingly, in the touch display device of the control group (please refer to FIG. 6), when the electrostatic discharge is greater than +4KV, the distance d2 between the overlapping regions 111B and 112B may cause electrostatic damage to the light-shielding layer 21. The small-area light-shielding layer 21 is broken, causing light leakage at the corners of the sensing region of the device. In contrast, the touch display device of the experimental group (please refer to FIG. 4A ) has an ESD tolerance increased to +11KV, that is, when the ESD is greater than +11KV, it is possible to cause electrostatic damage to the light-shielding layer 21 . In view of this, the distance d2 between the overlapping regions 111B and 112B is enlarged, which can evenly disperse the charges, achieve the purpose of effectively preventing electrostatic damage, and improve the yield of the manufacturing process.

The above-mentioned embodiments are only examples for convenience of description, and the scope of rights claimed by the present invention should be based on the scope of the patent application, rather than limited to the above-mentioned embodiments.

Claims (9)

1. A touch display device, comprising: a display device; and a touch panel, arranged on one side of the display device, Among them, the touch panel includes: a substrate; a light-shielding layer disposed between the substrate and the display device; and A circuit layer, arranged between the light-shielding layer and the display device, the circuit layer includes: a first signal electrode having a first overlapping area and a first non-overlapping area; and a second signal electrode, the second signal electrode has a second overlapping area and a second non-overlapping area; Wherein the first overlapping area and the second overlapping area overlap with the light shielding layer, and the distance between the first overlapping area and the second overlapping area is greater than that of the first non-overlapping area and the second non-overlapping area spacing of overlapping intervals; Wherein, an opening area is included between the first overlapping area and the second overlapping area, and between the first non-overlapping area and the second non-overlapping area, and a part of the opening area corresponds to the light shielding layer. 2. The touch display device as claimed in claim 1, wherein the distance between the first overlapping region and the second overlapping region is equal to the distance between the first non-overlapping region and the second non-overlapping region 1.5 to 10 times. 3 . The touch display device as claimed in claim 1 , wherein a distance between the first overlapping region and the second overlapping region is 40 to 300 microns. 4. The touch display device according to claim 1, wherein the first overlapping region has a first overlapping region edge, the first non-overlapping region has a first non-overlapping region edge, and the first non-overlapping region has a first edge The two overlapping regions have a second overlapping region edge, and the second non-overlapping region has a second non-overlapping region edge; wherein, the edge between the first overlapping region edge and the second overlapping region edge The shortest distance is greater than the shortest distance between edges of the first non-overlapping area and edges of the second non-overlapping area. 5. The touch display device as claimed in claim 1, wherein the width of the opening area is 0.2 to 2 times the distance between the first non-overlapping area and the second non-overlapping area. 6. The touch display device as claimed in claim 1, wherein the width of the opening area is 0.6 to 60 micrometers. 7. The touch display device as claimed in claim 1, wherein the width of the opening area is the same as the distance between the first overlapping area and the second overlapping area. 8. The touch display device according to claim 1, wherein the opening area extends from one side of the first overlapping area and one side of the second overlapping area respectively toward a direction, and the direction is the A width direction of a gap between the first non-overlapping region and the second non-overlapping region extends a distance of 3 to 10 times the distance between the first non-overlapping region and the second non-overlapping region. 9. The touch display device according to claim 1, wherein the opening area extends from one side of the first overlapping area and one side of the second overlapping area respectively toward a direction, and the direction is the A gap width direction extending between the first non-overlapping area and the second non-overlapping area is 100 to 1000 microns.