CN105718097A - Touch panel and sensing electrode thereof - Google Patents

Abstract

The invention relates to a touch panel and a sensing electrode thereof. The touch panel comprises a light-transmitting substrate, a sensing electrode and a plurality of metal leads. The transparent substrate comprises a visible touch area and a peripheral circuit area, wherein the visible touch area defines a first axis and a second axis. The sensing electrode is arranged on the light-transmitting substrate and configured in the visible touch area, the sensing electrode comprises first and second metal micro-wires which are arranged in a separated mode, each first and second metal micro-wire is non-linear and inclined to the first and second axes, the first and second metal micro-wires are mutually isolated and arranged in a staggered mode to form grid units, and the outlines of the grid units are different. The plurality of metal leads are arranged on the light-transmitting substrate and are configured in the peripheral circuit area, wherein the plurality of metal leads are electrically connected to the sensing electrodes.

Description

Touch panel and its sensing electrodes

technical field

The present invention relates to a touch panel and its sensing electrode structure, in particular to a touch panel and its sensing electrode structure capable of reducing or avoiding the occurrence of interference fringe (Moire).

Background technique

At present, touch technology has been widely used in display devices of various electronic products, so that users can control the actions of the electronic products by touch. In order to make the electrodes in the touch area of the touch panel difficult to be seen, indium tin oxide (ITO) is usually used to form transparent electrodes. However, as the application of touch panels gradually develops in the direction of large size, the technology using transparent electrodes of indium tin oxide has technical problems such as large resistance, slow touch response speed, multi-process steps and high production cost. Therefore, the metal mesh (MetalMesh) sensing electrode is developed to replace the application of the ITO transparent electrode.

However, when the metal grid of the touch panel is attached to the display panel, so-called interference fringe (Moire) is likely to occur, which affects the display quality of the image. The generation of interference fringes is mainly caused by the shape of the metal grid pattern. When adjacent fringe patterns are regularly arranged with each other, optical interference fringes will be generated. In addition, when the line width of the metal grid is thicker, or adjacent stripes overlap or intersect to increase the thickness of the stripe patterns, interference fringes will easily occur. Another reason is that when the touch panel is attached to the display panel, the metal grid of the touch panel and the thin-film transistor array (Thin-Film Transistorarray, TFTarray) of the display panel (such as black matrix (black matrix) or RGB pixel arrangement) are the same. Arranged in a regular grid, so when two patterns arranged in a regular grid overlap, optical interference fringes will also be generated.

In order to avoid or reduce the occurrence of interference fringes, the pattern and line shape of the metal grid of the current touch panel are usually arranged according to the thin film transistor array of the display panel, and are designed to be staggered and regularly arranged by a plurality of linear metal micro-wires. A grid pattern is formed in a way to increase visibility. For example, the metal grid includes a plurality of linear first metal microwires extending in a first direction and arranged in parallel, and a plurality of linear second metal microwires extending in a second direction and arranged in parallel, wherein a plurality of The linear first metal micro-wires and the plurality of linear second metal micro-wires are isolated from each other and interlaced to form a touch array. However, the metal grid of the touch panel in the prior art must cooperate well with the thin film transistor array of the display panel to reduce the occurrence of interference fringes. The angle needs to be carefully designed, which makes the design difficult, and the visibility is easily reduced due to the design error of the metal grid pattern.

Therefore, how to develop a touch panel and its sensing electrode structure to solve the problems faced by the prior art is an issue to be solved.

Contents of the invention

The purpose of the present invention is to provide a touch panel and its sensing electrodes, which can reduce the occurrence of interference fringes and improve visibility through the pattern design of the metal grid.

Another object of the present invention is to provide a touch panel and its sensing electrodes, which can avoid the occurrence of interference fringes after the touch panel and the display panel are bonded without being arranged according to the thin film transistor array of the display panel. .

To achieve the above purpose, the present invention provides a touch panel, which includes a light-transmitting substrate, sensing electrodes, and a plurality of metal leads. The transparent substrate includes a visible touch area and a peripheral circuit area, wherein the visible touch area defines a first axis and a second axis. The sensing electrodes are arranged on the light-transmitting substrate and arranged in the visible touch area, wherein the sensing electrodes include: a plurality of first metal micro-wires, the plurality of first metal micro-wires are arranged separately from each other, wherein each The first metal microwires are non-linear and inclined to the first axis and the second axis; and a plurality of second metal microwires, the plurality of second metal microwires are arranged separately from each other, and each of the The second metal microwires are non-linear and inclined to the first axis and the second axis; wherein, the plurality of first metal microwires and the plurality of second metal microwires are separated from each other and interlaced to form multiple grid units, the contours of the multiple grid units are all different. A plurality of metal leads are arranged on the light-transmitting substrate and arranged in the peripheral circuit area, wherein the plurality of metal leads are electrically connected to the sensing electrodes.

According to an embodiment of the present invention, wherein the first metal microwire and the second metal microwire are arc curves respectively, and both the first metal microwire and the second metal microwire are composed of a plurality of arc segments constituted.

According to another embodiment of the present invention, wherein the length of any arc segment of each of the first metal microwires is between 0.1mm and 10mm; and the length of any arc segment of each of the second metal microwires The length is between 0.1mm and 10mm.

According to another embodiment of the present invention, any one of the first metal microwires is divided into a plurality of curved segments corresponding to the plurality of grid units, wherein the plurality of curved segments have different arc lengths and radii of curvature; and Any one of the second metal microwires is divided into a plurality of curve segments corresponding to the plurality of grid units, wherein the plurality of curve segments have different arc lengths and curvature radii.

According to another embodiment of the present invention, wherein in the same grid unit, the two curved segments of the two adjacent first metal microwires have different arc lengths and curvature radii; and in the same grid unit In the grid unit, the two curved segments of the two adjacent second metal microwires have different arc lengths and curvature radii.

According to another embodiment of the present invention, wherein in the same grid unit, the shortest distance between two curve segments of two adjacent first metal microwires is between 50 μm and 200 μm; and in the same grid unit In the grid unit, the shortest distance between two curve segments of two adjacent second metal microwires is between 50 μm and 200 μm.

According to another embodiment of the present invention, wherein the radius of curvature of any curve segment of each of the first metal microwires is between 0.05mm and 5mm; and any curve of each of the second metal microwires This radius of curvature of the segment is between 0.05mm and 5mm.

According to another embodiment of the present invention, the first metal microwire and the second metal microwire are respectively a bending line.

According to another embodiment of the present invention, each of the bending lines of the first metal microwire and the second metal microwire is composed of a plurality of straight line segments connected.

According to another embodiment of the present invention, wherein any one of the first metal microwires is divided into a plurality of cutting segments corresponding to the plurality of grid units, wherein the plurality of cutting segments have different lengths; and any one of the second The metal microwires are divided into a plurality of cutting segments corresponding to the plurality of grid units, wherein the plurality of cutting segments have different lengths.

According to another embodiment of the present invention, wherein in the same grid unit, the two cutting segments of the two adjacent first metal microwires have different lengths; and in the same grid unit, the two cutting segments The two adjacent cutting sections of the second metal microwire have different lengths.

To achieve the above purpose, the present invention provides a sensing electrode disposed on a visible touch area of a touch panel, wherein the visible touch area defines a first axis and a second axis. The sensing electrode includes: a plurality of first metal micro-wires, the plurality of first metal micro-wires are arranged separately from each other, wherein each of the first metal micro-wires is a non-linear line, and is inclined to the first axis and the first metal micro-wire Two axes; and a plurality of second metal microwires, the plurality of second metal microwires are arranged separately from each other, wherein each of the second metal microwires is a non-linear line, and is inclined to the first axis and the second axis ; Wherein, the plurality of first metal microwires and the plurality of second metal microwires are mutually isolated and interlaced to form a plurality of grid units, and the profiles of the plurality of grid units are all different.

Description of drawings

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

FIG. 2A is a schematic diagram of the sensing electrode structure of the touch panel shown in FIG. 1 .

FIG. 2B is an enlarged view of the first area of the sensing electrode shown in FIG. 2A .

FIG. 2C is an enlarged view of the second area of the sensing electrode shown in FIG. 2A .

FIG. 3A is a schematic structural diagram of another embodiment of the sensing electrodes of the touch panel shown in FIG. 1 .

Fig. 3B is a partially enlarged view of the sensing electrode shown in Fig. 3A.

【Symbol Description】

1: Touch panel

10: Transparent substrate

11, 21: Sensing electrodes

12: Metal lead

A: Visual touch area

B: Peripheral line area

111, 111a, 111b, 211, 211a, 211b: first metal microwires

112, 112a, 112b, 212, 212a, 212b: second metal microwires

D ₁ : first direction

D ₂ : Second direction

14, 24: grid unit

r ₁ , r ₂ : radius of curvature

C ₁ , C ₂ : arc segment

θ: included angle

L: horizontal line

X: first axis

Y: Second axis

P: first area

Q: Second area

detailed description

Some typical embodiments embodying the features and advantages of the present invention will be described in detail in the description in the following paragraphs. It should be understood that the present invention is capable of various changes in different ways without departing from the scope of the present invention, and that the description and drawings therein are illustrative in nature rather than limiting the present invention.

Please refer to FIG. 1 and FIG. 2A , wherein FIG. 1 is a schematic structural diagram of a touch panel according to a preferred embodiment of the present invention, and FIG. 2A is a schematic structural diagram of sensing electrodes of the touch panel shown in FIG. 1 . The touch panel 1 of the present invention includes a light-transmitting substrate 10, a sensing electrode 11, and a plurality of metal leads 12, wherein the light-transmitting substrate 10 can be divided into a visible touch area A and a peripheral circuit area B, wherein the visible touch area Area A defines a first axis X and a second axis Y. The sensing electrodes 11 are arranged on the light-transmitting substrate 10 and arranged in the visible touch area A, and a plurality of metal leads 12 are arranged on the light-transmitting substrate 10 and arranged in the peripheral circuit region B, wherein the plurality of metal leads 12 are electrically connected to the sensing electrodes 11 respectively.

In this embodiment, the sensing electrode 11 of the touch panel 1 is a metal mesh (Metalmesh), and the sensing electrode 11 includes a plurality of first metal microwires 111 and a plurality of second metal microwires 112, wherein the plurality of first metal microwires 112 The metal micro-wires 111 are spaced apart from each other and extend substantially along the _first direction D1 respectively, and any two adjacent first metal micro-wires 111a, 111b are not alternately arranged. Each of the first metal microwires 111 is a non-linear line inclined to the first axis X and the second axis Y, wherein the non-linear line is preferably an arc. The plurality of second metal micro-wires 112 are spaced apart from each other and extend substantially along the _second direction D2 respectively, and any two adjacent second metal micro-wires 112a, 112b are not alternately arranged. Each of the second metal microwires 112 is a non-linear line inclined to the first axis X and the second axis Y, wherein the non-linear line is preferably an arc. Two adjacent first metal microwires 111a, 111b and two adjacent second metal microwires 112a, 112b can form an irregular grid unit 14, in other words, multiple first metal microwires of the sensing electrode 11 The micro-wires 111 and the plurality of second metal micro-wires 112 are isolated from each other and interlaced to form a plurality of irregular grid units 14 , wherein the profiles of the plurality of grid units 14 are all different. In this embodiment, the first direction D ₁ and the second direction D ₂ are inclined to the first axis X and the second axis Y respectively, and the light transmittance is better when the inclination angle is 30 degrees to 60 degrees, but not based on this limit. The included angle between the first direction D ₁ and the second direction D ₂ may range from 60 degrees to 120 degrees, and is not limited thereto.

Please refer to FIG. 2A and FIG. 2B at the same time, wherein FIG. 2B is an enlarged view of the first area of the sensing electrode shown in FIG. 2A . In some embodiments, such as the first region P shown in FIG. 2A , any one of the first metal microwires 111 can be divided into a plurality of curved segments corresponding to the plurality of grid units 14, wherein one of the plurality of curved segments All have different arc lengths and curvature radii r ₁ . In addition, any one of the second metal microwires 112 can be divided into a plurality of curved segments corresponding to the plurality of grid units 14 , wherein the plurality of curved segments have different arc lengths and curvature radii r ₂ . In some embodiments, the corresponding curve segments of any two adjacent first metal microwires 111a, 111b have different arc lengths and curvature radii r ₁ , in other words, in the same grid unit 14, two adjacent first metal microwires The two curve segments of a metal microwire 111a, 111b have different arc lengths and curvature radii r ₁ . Corresponding curve segments of any two adjacent second metal microwires 112a, 112b have different arc lengths and curvature radii r ₂ , in other words, in the same grid unit 14, two adjacent second metal microwires 112a, 112b The two curved segments of 112b have different arc lengths and radii of curvature r ₂ . In some embodiments, the curvature radius r ₁ of any curve segment of each first metal microwire 111 is between 0.05 mm and 5 mm, but not limited thereto. The curvature radius r ₂ of any curve segment of each second metal microwire 112 is also between 0.05 mm and 5 mm, but not limited thereto. Please refer to FIG. 2A and FIG. 2C at the same time, wherein FIG. 2C is an enlarged view of the second area of the sensing electrode shown in FIG. 2A . In some embodiments, such as the second area Q shown in FIG. 2A , each non-linear first metal microwire 111 is composed of a plurality of arc segments C ₁ , and the length of any arc segment C ₁ is between 0.1 mm. between 0.25mm and 1.5mm, but not limited thereto. Each non-linear _second metal microwire 112 is composed of multiple arc segments C2, and the length of any arc segment _C2 is also between 0.1mm and 10mm, preferably 0.25mm to 1.5mm, but not This is the limit.

In some embodiments, in any grid unit 14, and in the two curve segments of two adjacent first metal microwires 111a, 111b, the radius of curvature of the curve segment with the longer arc length r ₁ is larger than the radius of curvature r ₁ of a curved segment having a shorter arc length. In any grid unit 14, and in the two curve segments of two adjacent second metal microwires 112a, 112b, the curve segment with a longer arc length has a shorter curvature radius _r2 than that with The curved segment of the arc length has a large radius of curvature r ₂ . In some embodiments, in any grid unit 14, the corresponding curve segments of any two adjacent first metal microwires 111a, 111b do not intersect, and the shortest distance between them is between 50 μm and 200 μm, but Not limited to this. In any grid unit 14, the corresponding curve segments of any two adjacent second metal microwires 112a, 112b do not intersect, and the shortest distance between them is between 50 μm and 200 μm, but not limited thereto.

In some embodiments, the material of the light-transmitting substrate 10 can be selected from polyethylene terephthalate (Polyethyleneterephthalate, PET), polyetherimide (Polyetherimide, PEI), polyphenylenesulfone (Polyphenylensulfone, PPSU), polyamide Imine (Polyimide, PI), polyethylene naphthalate (Polyethylenenaphthalate, PEN), cycloolefin copolymer (Cyclicoolefin copolymer, COC), liquid crystal polymer (Liquid Crystal Polymer, LCP) or a combination thereof, and not This is the limit. In some embodiments, the metal microwires of the metal grid can be made of copper, gold, silver, aluminum, tungsten, iron, nickel, chromium, titanium, molybdenum, indium, tin or at least any two thereof of composite materials. In some embodiments, the line width of the metal micro-wires may be between 1 μm and 20 μm, wherein the line width of the metal micro-wires is preferably between 1 μm and 5 μm, and is more preferably less than 3 μm. In addition, the thickness of the metal microwires is preferably between 0.1 μm and 20 μm, and more preferably between 0.1 μm and 2 μm.

Please refer to FIG. 3A , wherein FIG. 3A is a schematic structural diagram of another embodiment of the sensing electrodes of the touch panel shown in FIG. 1 . In this embodiment, the sensing electrode 21 is a metal mesh, and the sensing electrode 21 includes a plurality of first metal microwires 211 and a plurality of second metal microwires 212, wherein the plurality of first metal microwires 211 They are spaced apart from each other and extend substantially along the _first direction D1 respectively, and any two adjacent first metal micro-wires 211a, 211b are arranged in a non-staggered manner. Each of the first metal microwires 211 is a non-linear line inclined to the first axis X and the second axis Y, wherein the non-linear line is preferably a bent line, and the bent line is composed of a plurality of straight line segments. The plurality of second metal micro-wires 212 are spaced apart from each other and extend substantially along the _second direction D2 respectively, and any two adjacent second metal micro-wires 212a, 212b are not alternately arranged. Each of the second metal microwires 212 is a non-linear line inclined to the first axis X and the second axis Y, wherein the non-linear line is preferably a bent line, and the bent line is composed of a plurality of straight line segments. Two adjacent first metal microwires 211a, 211b and two adjacent second metal microwires 212a, 212b can form an irregular grid unit 24, in other words, multiple first metal microwires of the sensing electrode 21 The micro-wires 211 and the plurality of second metal micro-wires 212 are isolated from each other and interlaced to form a plurality of irregular grid units 24 , wherein the profiles of the plurality of grid units 24 are different. In this embodiment, the _first direction D1 and the _second direction D2 are inclined to the first axis X and the second axis Y, respectively. The included angle between the first direction D ₁ and the second direction D ₂ may range from 60 degrees to 120 degrees, and is not limited thereto.

Please refer to FIG. 3A and FIG. 3B at the same time, wherein FIG. 3B is a partially enlarged view of the sensing electrode shown in FIG. 3A . In some embodiments, any one of the first metal microwires 211 can be divided into a plurality of cutting segments corresponding to the plurality of grid units 24 , wherein the plurality of cutting segments have different lengths. In addition, any one of the second metal microwires 212 can be divided into a plurality of cutting segments corresponding to the plurality of grid units 24 , wherein the plurality of cutting segments have different lengths. In some embodiments, the corresponding cutting segments of any two adjacent first metal microwires 211a, 211b have different lengths. In other words, in the same grid unit 24, two adjacent first metal microwires 211a, 211b The two cut segments have different lengths. The corresponding cutting sections of any two adjacent second metal microwires 212a, 212b have different lengths. In other words, in the same grid unit 24, the two cutting sections of two adjacent second metal microwires 212a, 212b have different lengths. different lengths. In some embodiments, the length of any cut section of each first metal microwire 211 is between 0.1 mm to 10 mm, preferably 0.25 mm to 1.5 mm, but not limited thereto. The length of any cut segment of each second metal microwire 212 is also between 0.1 mm to 10 mm, preferably 0.25 mm to 1.5 mm, but not limited thereto. In this embodiment, the angle θ between the bending line and the horizontal line L generated when any point of any bending line intersects with the horizontal line L is between 20 degrees and 60 degrees.

In some embodiments, in any grid unit 24, the corresponding cutting segments of any two adjacent first metal microwires 211a, 211b are not staggered, and the shortest distance between them is between 50 μm and 200 μm, but Not limited to this. In any grid unit 24 , the corresponding cutting segments of any two adjacent second metal microwires 212 a , 212 b are not staggered, and the shortest distance between them is between 50 μm and 200 μm, but not limited thereto. In some embodiments, any cut section of the first metal microwire 211 may be a straight line segment or a line segment with a bent portion. Any cut section of the second metal microwire 212 may be a straight section or a line section with a bent portion.

To sum up, the present invention provides a touch panel and its sensing electrodes, which can reduce the occurrence of interference fringes and improve visibility through the pattern design of the metal grid. The touch panel and its sensing electrodes of the present invention do not need to be arranged according to the thin film transistor array of the display panel, and can avoid the occurrence of interference fringes after the touch panel and the display panel are bonded.

The present invention can be modified in various ways by those skilled in the art, without departing from the patent scope protected by the claims.

Claims (12)

1. a contact panel, comprises:

One transparent substrates, including visual Touch Zone and a perimeter circuit district, wherein this visual Touch Zone defines a first axle and one second axis；

One sensing electrode, is arranged on this transparent substrates and is configured in this visual Touch Zone, and wherein this sensing electrode includes:

The a plurality of first micro-line of metal, this plurality of first metal separate arrangement of micro-line, this micro-line of the first metal of each of which is a non-rectilinear, and favours this first axle and this second axis；And

The a plurality of second micro-line of metal, this plurality of second metal separate arrangement of micro-line, this micro-line of the second metal of each of which is a non-rectilinear, and favours this first axle and this second axis；

Wherein, this plurality of first micro-line of metal is mutually isolated with this plurality of second micro-line of metal and is crisscross arranged to be formed multiple grid cell, and the profile of the plurality of grid cell all differs；And

Multiple metal lead wires, are arranged on this transparent substrates and are configured in this perimeter circuit district, and wherein the plurality of metal lead wire is electrically connected to this sensing electrode.

2. contact panel as claimed in claim 1, wherein this micro-line of the first metal and this second metal micro-line respectively arc curve, and this micro-line of the first metal and this micro-line of the second metal are all made up of multiple segmental arcs.

3. contact panel as claimed in claim 2, the length of any one segmental arc of this micro-line of the first metal of each of which is between 0.1mm to 10mm；And the length of any one segmental arc of each this micro-line of the second metal is between 0.1mm to 10mm.

4. contact panel as claimed in claim 1, the corresponding the plurality of grid cell of this micro-line of the first metal of any of which bar divides into multiple curved section, and wherein the plurality of curved section has different arc length and radius of curvature；And this micro-line of the second metal of any bar corresponds to the plurality of grid cell and divides into multiple curved section, wherein the plurality of curved section has different arc length and radius of curvature.

5. contact panel as claimed in claim 4, wherein in this grid cell same, two curved sections of two adjacent these micro-lines of the first metal have different arc length and radius of curvature；And in same grid cell, two curved sections of two adjacent these micro-lines of the second metal have different arc length and radius of curvature.

6. contact panel as claimed in claim 4, wherein in this grid cell same, the beeline of two curved sections of two adjacent these micro-lines of the first metal is between 50 μm to 200 μm；And in same grid cell, the beeline of two curved sections of two adjacent these micro-lines of the second metal is between 50 μm to 200 μm.

7. contact panel as claimed in claim 3, this radius of curvature of any one curved section of this micro-line of the first metal of each of which is between 0.05mm to 5mm；And this radius of curvature of any one curved section of each this micro-line of the second metal is between 0.05mm to 5mm.

8. contact panel as claimed in claim 1, wherein this micro-line of the first metal and this second metal micro-line respectively folding line.

9. contact panel as claimed in claim 8, wherein respectively this folding line of this micro-line of the first metal and this micro-line of the second metal is connected to form by a plurality of straightway.

10. contact panel as claimed in claim 9, the corresponding the plurality of grid cell of this micro-line of the first metal of any of which bar divides into multiple cut length, and wherein the plurality of cut length has different length；And this micro-line of the second metal of any bar corresponds to the plurality of grid cell and divides into multiple cut length, wherein the plurality of cut length has different length.

11. contact panel as claimed in claim 10, wherein in this grid cell same, two cut length of two adjacent these micro-lines of the first metal have different length；And in same grid cell, two cut length of two adjacent these micro-lines of the second metal have different length.

12. a sensing electrode, being arranged at a visual Touch Zone of a contact panel, wherein this visual Touch Zone defines a first axle and one second axis, and this sensing electrode includes:

The a plurality of first micro-line of metal, this plurality of first metal separate arrangement of micro-line, this micro-line of the first metal of each of which is a non-rectilinear, and favours this first axle and this second axis；And

The a plurality of second micro-line of metal, this plurality of second metal separate arrangement of micro-line, this micro-line of the second metal of each of which is a non-rectilinear, and favours this first axle and this second axis；

Wherein, this plurality of first micro-line of metal is mutually isolated with this plurality of second micro-line of metal and is crisscross arranged to be formed multiple grid cell, and the profile of the plurality of grid cell all differs.