TWI669641B - Touch panel capable of reducing the Murray effect - Google Patents

Abstract

A touch panel capable of reducing the Murray effect mainly comprises a transparent substrate and two sensing electrodes, wherein the two sensing electrodes are opposite to each other across the transparent substrate, and the metal grids of the two sensing electrodes respectively comprise metal lines without sensing function, wherein The angle between the metal lines of the sensing function is determined in a random manner under certain conditions, thereby reducing the area of the node, thereby effectively reducing or eliminating the diffraction effect at the node, and in addition to the metal grid of the two sensing electrodes The metal lines of the sensing function can be interlaced into a staggered pattern of irregular shapes, thereby achieving the purpose of not generating interference fringes when used with display panels of various mainstream sizes.

Description

Touch panel capable of reducing the Murray effect

A touch panel capable of reducing the Murray effect, in particular, a touch panel capable of improving the recognition of the touch signal while effectively reducing the generation of interference fringes, and the sensing electrode is not required to be used as long as the film mask is used. Glass reticle, which effectively saves production costs, and does not produce interference fringes especially when used with display panels of various mainstream sizes.

When the metal grid of the touch panel is applied to the display panel, the so-called interference pattern (Moire) is easily generated, which affects the display quality of the screen. The interference pattern is generated because several factors affect the light transmittance of the shape and arrangement of the metal grid pattern and the line width of the metal grid. When adjacent stripe patterns are regularly arranged with each other, optical interference fringes are generated, in order to effectively prevent optical phenomena such as interference fringes, such as the so-called Moire effect. It is a very effective method to make the line width of the metal grid between 1 micrometer and 3 micrometers, and to adjust the shape angle or arrangement of the metal grid.

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 (TFT array) of the display panel (such as black matrix or RGB) The pixel arrangement is also arranged in a regular grid pattern, so that optical interference lines are also generated when the patterns of the two regular grids are overlapped.

In order to avoid or reduce the occurrence of interference fringes, the wire width of the wire can be between 1 micrometer and 3 micrometers, so that the fine line width must be made by a high-resolution glass mask, but the cost of the glass mask is Expensive, leading to increased initial development and manufacturing costs.

Therefore, it can be produced through a film mask (see FIG. 1A), but the film mask 1a has a lower resolution than the glass mask, so that the intersection of the line and the line is enlarged relative to the glass mask, and Through the thin film mask 1a through the exposure and development etching process, the metal grid 1b (as shown in FIG. 1B) is formed, the line width is only 5 to 8 micrometers, and a plurality of nodes N are formed at the intersection of the line and the line. As described above, the line width of the film mask 1a is large, so the area of the node is large, and each node is a uniform shape of a positive cross. Therefore, when the light reaches the node, the diffraction phenomenon is likely to occur, and the influence is transparent. Luminosity and severely affect the display.

Refer to Taiwan Invention Patent Publication No. I601043, "Touch Panel with Inductive Metal Strips", which mainly includes a transparent substrate and two sensing electrodes. The two sensing electrodes are opposed to each other across the transparent substrate, and the metal grids of the two sensing electrodes are respectively It consists of inductive metal lines and non-inductive metal lines, and the metal grids are formed with interlaced lines. The purpose of the case is to avoid the diffraction effect. The technical method used in this case is to use metal mesh. The grid area of the grid becomes larger (that is, the grid density becomes larger), and the number of nodes can be reduced. However, the number of nodes decreases, indicating that the position of the diffraction effect is reduced, but the area of the node itself is not reduced. It is still possible to produce a diffraction effect.

In addition, when the case interleaves "inductive metal lines" and "inductive-free metal lines", although the whole can form a mesh pattern that is invisible to the naked eye, both of them are regular networks. Grid pattern, so interlaced is still a regular grid pattern, that is, the spacing between metal lines is fixed, so when combined with different specifications of the display panel, it will be with some specifications of the black matrix (Black Matrix) and color filter layer have interference pattern, so it must Metal grids with different arrangement intervals must be designed separately; however, the problem of high manufacturing cost and the diffraction effect at the nodes are to be overcome.

The main object of the present invention is to provide a touch panel design method that can reduce the generation of interference fringes while improving touch sensitivity, and can also use a low-cost film mask to make a metal grid, especially in a single specification. Various resolution display panels are used.

The invention mainly provides a technical means for reducing the diffraction effect occurring at the node, that is, the angles between the two lines constituting the node are not equal, wherein the angles are within an appropriate angle range, but the angle of the angle can be Determined in a random number within a suitable range of angles, such as selecting different angles of the angle, so that the shape of each node is slightly different and the area at the node is reduced, so that the chance of the diffraction effect occurring at the node can be effectively reduced. Therefore, the nodes and the metal mesh are not aligned with the black matrix and the color filter layer of the display, that is, the shapes of the nodes of the metal mesh having the sensing function of the present invention are not single positive. The shape of the cross can effectively reduce the diffraction effect occurring at the node. In addition, the lines constituting the metal mesh will also have a line of approximate straight lines such as curvature and slope, so that they will not be arranged in an orderly manner. The Black Matrix and the color filter correspond to each other, and thus can be applied by utilizing the technique of the present invention for reducing the diffraction effect at the node. Various mainstream displays do not create interference ripple effects.

The invention further configures the metal lines without induction function in the metal grid with the sensing function, and allows the non-inductive metal lines of the different sensing electrodes to be interlaced with each other through the transparent substrate, so that the first sensing electrode and the first sensing electrode The second sensing electrodes are integrally formed with mutually staggered patterns. Since the shapes of the nodes of the present invention are inconsistent, the metal lines without inductive functions are not all straight lines but metal lines with curvature or slope, so the staggered pattern is mainly Consists of irregular quadrilaterals, with the display surface When the regular grid-like arrangement of the RGB pixel arrangement is applied, it is naturally not easy to overlap without generating interference fringes.

In order to achieve the above object, the touch panel capable of reducing the Murray effect of the present invention comprises a transparent substrate; a first sensing electrode is disposed on a first surface of the transparent substrate and extends along a first direction; The first sensing electrode includes a plurality of first metal meshes, and the first metal meshes comprise a plurality of nodes, and the angles formed between the two lines constituting the nodes in the first metal meshes The first metal grid is provided with a plurality of first metal lines without a sensing function, and the first metal lines of the non-inductive function are not connected at both ends. But adjacent to the first metal grid, and the first metal lines having no inductive function are spaced apart from each other; a second sensing electrode is disposed on a second surface of the transparent substrate and along a first Extending in two directions, the first surface and the second surface need to correspond to each other, the second sensing electrode comprises a plurality of second metal meshes, the second metal meshes comprise a plurality of nodes, and the second metal meshes Forming these nodes The angle formed by any two lines is within an appropriate range of angles and is determined by random numbers in the above range; a second metal grid is provided with a plurality of second metal lines having no sensing function, such The two ends of the second metal line of the sensing function are not connected to but close to the second metal grid, and the second metal lines without the sensing function are spaced apart from each other.

Wherein the first metal mesh and the first metal lines of the non-inductive function in the first metal mesh, and the second metal mesh and the second metal mesh The second metal line having no inductive function is formed by interlacing the upper and lower sides of the transparent substrate to form a staggered pattern, and the staggered pattern includes a plurality of irregular quadrangles.

The present invention further includes that the mesh spacing of the first metal mesh and the second metal mesh is increased to 1.8 mm or more, and the variation of the capacitance value can be increased by increasing the mesh pitch. The purpose of touch signal recognition.

In addition, the upper part mentions that the mesh width of the first metal mesh or the second metal mesh is increased to improve the touch signal recognition degree, but only increasing the mesh width may cause the metal mesh density to be insufficient. The naked eye senses the presence of the mesh, and the first metal wire and the second metal wire having the non-inductive function are disposed in the first metal mesh and the second metal mesh, such that the first sensing electrode The mesh density with the second sensing electrode is maintained to a level that is not perceived by the naked eye.

1‧‧‧Touch panel capable of reducing the Murray effect

10‧‧‧Transparent substrate

11‧‧‧First sensing unit

12‧‧‧Second sensing unit

111‧‧‧First sensing electrode

111A‧‧‧First Metal Grid

111B‧‧‧First metal wire without induction

113‧‧‧First metal lead

121‧‧‧Second sensing electrode

121A‧‧‧Second metal grid

121B‧‧‧Second metal lines without induction

123‧‧‧Second metal lead

A, B, C‧‧‧ local areas

V‧‧‧Visual touch area

L‧‧‧ surrounding area

X‧‧‧ first direction

Y‧‧‧second direction

1a‧‧‧film mask

1b‧‧‧Metal grid

1A is a schematic view of a conventional film mask.

1B is a schematic view of a metal mesh fabricated by a conventional film mask exposure development etching process.

2 is a schematic view of a touch panel capable of reducing the Murray effect of the present invention.

FIG. 3 is an enlarged schematic view of the first sensing electrode and its partial area A.

4 is a schematic enlarged view of the second sensing electrode and its partial region B.

Figure 5 is an enlarged schematic view of a partial area C of Figure 2.

Fig. 6A is a schematic view showing an embodiment of an angle formed between a node and two lines constituting a node.

Fig. 6B is a schematic view showing another embodiment of the angle formed between the node and the two lines constituting the node.

The embodiments of the present invention will be described in more detail below with reference to the drawings and the reference numerals, which can be implemented by those skilled in the art after having studied this specification.

Referring to FIG. 2, FIG. 2 is a schematic diagram of a touch panel capable of reducing the Murray effect according to the present invention. As shown in FIG. 2, the touch panel 1 capable of reducing the Murray effect of the present invention includes at least a transparent substrate 10, a first sensing unit 11, and a second sensing unit 12, wherein the transparent substrate 10 includes a visible a touch area V and a peripheral line area L, wherein the peripheral line area L is between the edge of the transparent substrate 10 and the visible touch area V, and the visible touch area V is the transparent substrate 10 The edge area L is the edge area of the transparent substrate 10, that is, the visible touch area V is farther from the edge of the transparent substrate 10 than the peripheral line area L, or the peripheral line area L surrounds the edge area Visual touch area V.

The transparent substrate 10 may be a rigid substrate or a flexible substrate; the material of the rigid substrate may be glass, tempered glass, sapphire, ceramic or other suitable materials; and the material of the flexible substrate may be a polymer material. The polymer material is, for example, polyethylene (PE), polypropylene (PP), polystyrene (PS), polymethyl methacrylate (PMMA), polyvinyl chloride (PVC), nylon (Nylon), polycarbonate. Ester (PC), polyurethane (PU), polytetrafluoroethylene (PTFE), polyethylene terephthalate (PET), polyimide (PI), acrylic resin or polymethyl A material such as a mixture of methyl acrylate and polycarbonate. The touch panel formed by using the flexible substrate may have flexibility, and thus is suitable for being coated on a flexible surface or any flexible object that requires a touch function, for example, a display panel and other suitable materials are formed. Flexible substrate.

The first sensing unit 11 and the second sensing unit 12 are disposed on a first surface and a second surface of the transparent substrate 10, and the first surface and the second surface need to correspond to each other, for example, corresponding to each other. The surface and the lower surface may be disposed on the upper surface or the lower surface of the different transparent substrate 10, and then bonded together according to their relative positions by optical glue (not shown), so the first sensing unit 11 and the surface The second sensing unit 12 can achieve the purpose of the present invention by arranging the first sensing unit 11 and the second sensing unit 12 on a single or multiple substrates as long as part or all of them are in parallel positions corresponding to each other. of.

Referring to FIG. 3, FIG. 3 is an enlarged schematic view of the first sensing electrode and its partial area A, and is shown in FIG. 2 , wherein FIG. 2 is a schematic diagram showing the first sensing unit 11 extending in a first direction Y and extending axially. The first sensing unit 11 includes a plurality of first sensing electrodes 111 and a plurality of first metal leads 113. The first sensing electrodes 111 are located in the visible touch region V and extend axially along the first direction Y. The first metal leads 113 are located in the peripheral line region L, and the first sensing electrodes 111 are electrically connected to the first metal leads 113.

The adjacent two first sensing electrodes 111 are not connected to each other, and the vertical dotted line in FIG. 2 indicates that there is a gap between the adjacent two first sensing electrodes 111, because FIG. 2 is a touch panel capable of reducing the Murray effect. For the actual structure of the first sensing electrode 111, please refer to the enlarged view of the partial area A of FIG. 3. As shown in the partial area A, the first sensing electrode 111 includes a plurality of first metal grids (metal Mesh) 111A, wherein a first metal mesh 111A has four nodes, and the nodes are formed by intersecting metal lines, and the two lines forming the nodes in the first metal mesh 111A are substantially non-linear (also A plurality of straight lines can be disposed therefrom, wherein the first metal mesh 111A is configured with a plurality of first metal wires 111B having no sensing function, and the first metal wires 111B having no sensing function are not connected at both ends but are close to the first metal The edge of the grid 111A, and the non-inductive first metal lines 111B are spaced apart from each other.

Referring to FIG. 4, FIG. 4 is an enlarged schematic view of the second sensing electrode and its partial region B, and is shown in FIG. 2, wherein FIG. 2 is a schematic diagram showing the second sensing unit 12 extending in a second direction X and extending axially. The second sensing unit 12 includes a plurality of second sensing electrodes 121 and a plurality of second metal leads 123. The second sensing electrodes 121 are located in the visible touch area V, and the second metal leads 123 are located at the periphery. The second sensing electrodes 121 are electrically connected to the second metal leads 123 in the line region L.

The adjacent two second sensing electrodes 121 are not connected to each other. The horizontal dotted line in FIG. 2 indicates that there is a gap between the adjacent two second sensing electrodes 121, because FIG. 2 is a touch panel capable of reducing the Murray effect. For the actual structure of the second sensing electrode 121, please refer to the enlarged view of the local area B of FIG. 4. As shown in the partial area B, the second sensing electrode 121 includes a plurality of second metal meshes (metal mesh). 121A, wherein a second metal grid 121A also has four nodes, the nodes are formed by intersecting metal lines, and any two of the second metal grids 121A constituting the nodes are non-linear The second metal grid 121A is provided with a plurality of second metal lines 121B having no sensing function, and the second metal lines 121B having no sensing function are not connected at both ends but are close to the edge of the second metal grid 121A. And the non-inductive second metal lines 121B are spaced apart from each other.

Please also note that the first metal mesh or the second metal mesh 121A is made of at least one of copper gold, aluminum, copper, silver, chromium, titanium, molybdenum, niobium, nickel and alloys of the above metals. The first metal mesh 111A or the second metal mesh 121A is exposed by a film mask or a glass mask; wherein the first metal mesh 111A or the second metal mesh 121A is meshed The width is between 0.2 and 3.0 mm.

Referring to FIG. 5, FIG. 5 is an enlarged schematic view of a partial area C of FIG. The first sensing unit 11 and the second sensing unit 12 are disposed opposite to each other, and the first metal grid 111A and the second metal mesh are formed as shown in FIG. 5 . The grids 121A are oppositely arranged in a mutually opposite arrangement relationship, so that the first metal grids 111A are interlaced with the second metal grids 121A to form a grid having a lower density and an equal spacing; and the non-inductive functions are The first metal line 111B and the non-inductive second metal line 121B are also in an interlaced relative arrangement relationship; and as shown in the embodiment of FIG. 5, the non-inductive first metal line 111B and the When the second metal lines 121B having no sensing function are interlaced with each other, a grid having a higher density and a substantially equal pitch is formed, that is, the same feeling The first metal line 111B and the second metal line 121B that are functional are used to increase the mesh density of the first metal mesh 111A and the second metal mesh 121A, and thus the first sensing electrode and the second sensing The electrodes are interdigitated to form a staggered pattern having a high density and being invisible to the naked eye, the staggered pattern mainly comprising a plurality of irregular quadrilaterals or more irregular trigonal shapes.

In an embodiment of the present invention, the angle between any two lines constituting the nodes in the first metal mesh is within an appropriate angle range and different selections and combinations are made within the appropriate angle range; The angle between any two lines constituting the nodes in the second metal grid is also within a suitable angle range and is selected and matched in the appropriate angle range. The appropriate angle range is 75~125. Degree, the preferred angle range is 77~123 degrees, and the optimal angle range is 80~120 degrees; for example, in Figure 6A, the number of angles formed when any two lines intersect is 4, and the angle of the four angles Can be different, for example, θ ₁ ~ θ ₄ can be 70 degrees, 110 degrees, 80 degrees, 100 degrees, respectively, just 360 degrees after matching; or as shown in Figure 6B, θ ₁ ~ θ ₄ are selected 95 degrees, 85 Degree, 65 degrees, 115 degrees, the line connecting the two nodes is not a straight line but an approximately straight line with curvature or slope, so that the staggered pattern contains irregular shapes.

Preferably, the angle formed by the non-inductive first metal lines 111B and the non-inductive second metal lines 121B are also arranged to be within an appropriate angle range and within the appropriate angle range. For different choices and combinations, the above suitable angle range is 75~125 degrees, the preferred angle range is 77~123 degrees, and the best angle range is 80~120 degrees; this can make the staggered pattern from more irregular quadrilateral The pattern is formed, but the entirety of the staggered pattern still has a certain rule, because the included angle is distributed in a random range in a specific range, and the entirety of the staggered pattern is a mesh pattern composed of irregular quadrilaterals.

Preferably, the non-inductive first metal lines 111B and the non-inductive functions The second metal line 121B is not a pure straight line but an approximately straight line with a curvature or a slope. In the above manner, the shape of each node of the inductive metal mesh of the present invention is mostly a non-positive cross shape. Of course, it is also possible to intersperse and arrange some nodes with positive crosses, thereby reducing the area of the nodes, and effectively reducing the chance that the diffraction effect occurs at the nodes, and forming a staggered pattern of irregular quadrilaterals according to the angle selection of the angles and the non-linear lines. Thus, the nodes and the irregular metal mesh are not aligned with the regularly arranged black matrix and color filter layers on the display, and can be applied to various mainstream displays without interference ripple effects.

The interval between any two adjacent non-inductive first metal lines of the non-inductive function is between 0.2 mm and 0.6 mm, and the first metal lines without the sensing function are The first metal line of the non-inductive function close to the first metal grid and the first metal grid are spaced between 0.2 mm and 0.6 mm; any of the second metal lines without the sensing function The spacing between the two adjacent non-inductive second metal lines is between 0.2 mm and 0.6 mm, and the non-inductive second metal lines are adjacent to the non-inductive function of the second metal grid. The distance between the two metal lines and the second metal mesh is between 0.2 mm and 0.6 mm.

The non-inductive first metal lines 111B are interspersed with larger spaces between each other for the lines of the second metal mesh to be disposed therebetween; likewise, the non-inductive second metal lines 121B are interposed therebetween Large spaces are also interspersed for the metal lines of the first metal grid to be placed therebetween.

In an embodiment of the present invention, the first metal mesh 111A or the second metal mesh 121A has a mesh width of 1.8 mm or more, thereby increasing the amount of change in the capacitance value, thereby achieving improved touch signal recognition. purpose.

In addition, the first metal wire 111A and the second metal mesh 121A are respectively provided with a first metal line 111B which is interlaced and has no sensing function, and has no sensing function. The second metal line 121B is raised in the upper part to increase the grid width of the first metal grid 111A or the second metal grid 121A, thereby improving the touch signal recognition, but only increasing the grid width causes The metal mesh density is insufficient to make the naked eye feel the presence of the mesh, and the non-inductive first metal lines 111B and the second metal lines 121B are disposed on the first metal mesh 111A and the second metal mesh. Among the 121A, the mesh density of the first sensing electrode 111 and the second sensing electrode 121 is kept to such an extent that it is not perceived by the naked eye.

In addition, since the non-inductive first metal line 111B and the non-inductive second metal line 121B are not connected to the sensed metal grid, the number of nodes is reduced, and the first metal mentioned in the upper section is The grid 111A and the second metal grid 121A seem to form a plurality of mutually staggered nodes in plan view, but the transparent substrate is interposed between the first metal grid 111A and the second metal grid 121A. It is not a node. Since it is not a solid node, there will be no node expansion. Therefore, it is not necessary to use a high-resolution glass mask. A thin film mask (such as a negative film) can be used to make a metal grid with few nodes. , greatly improve the transparency, and effectively improve the display effect, and also because the cost of the film mask is much lower than the glass mask, can also effectively reduce the production cost.

In summary, the present invention has indeed achieved a touch panel design method that can reduce the generation of interference fringes while improving touch sensitivity, and is fabricated by a thin film mask, which can also reduce the manufacturing cost.

Since the technology of the present invention is not found in published publications, periodicals, magazines, media, exhibition venues, and thus is novel, and can be implemented by breaking through the current technical bottlenecks, it is indeed progressive. In addition, the present invention can solve the problems of the conventional technology, improve the overall use efficiency, and can achieve the value of industrial utilization.

The above is only a preferred embodiment for explaining the present invention, and is not intended to limit the present invention in any way, and any modifications or alterations to the present invention made in the spirit of the same invention. All should still be included in the scope of the intention of the present invention.

Claims (9)

A touch panel capable of reducing the Murray effect, comprising: a transparent substrate; a first sensing electrode disposed on a first surface of the transparent substrate and extending along a first direction, the first sensing electrode A plurality of first metal meshes are included, the first metal meshes comprising a plurality of nodes, and angles formed between any two lines constituting the nodes in the first metal mesh are at an appropriate angle Between the range and the appropriate angle range, the first metal grid is provided with a plurality of first metal lines without sensing function, and the first metal lines without the sensing function are not connected to but close to each other. In the first metal grid, and the first metal lines having no inductive function are spaced apart from each other, the appropriate angle ranges from 75 to 125 degrees; and a second sensing electrode is disposed on the transparent substrate. a second surface and extending along a second direction, the first surface and the second surface need to correspond to each other, the second sensing electrode comprises a plurality of second metal grids, and the second metal grid comprises Plural node, these The angle formed by the two lines constituting the nodes in the two metal grids is within an appropriate range of angles and is arranged in a random manner in the appropriate angular range, and a second metal grid is disposed a plurality of second metal lines having no sensing function, the two ends of the non-inductive second metal lines are not connected to but close to the second metal grid, and the non-inductive second metal lines are spaced apart from each other The appropriate angle range is between 75 and 125 degrees; wherein the first metal grid and the first metal lines of the non-inductive function in the first metal grid, and the second metal Grid and in the second metal grid The non-inductive second metal lines are formed by interlacing the upper and lower sides of the transparent substrate to form a staggered pattern, and the staggered pattern includes a plurality of irregular quadrangles. The touch panel capable of reducing the Murray effect according to the first aspect of the patent application, wherein the first sensing electrode or the second sensing electrode is made of gold, aluminum, copper, silver, chromium, titanium, molybdenum, At least one of niobium, nickel, and an alloy of the above metals. The touch panel capable of reducing the Murray effect according to the first aspect of the patent application, wherein the first sensing electrode or the second sensing electrode is exposed by a film mask or a glass mask. The touch panel capable of reducing the Murray effect according to the first aspect of the patent application, wherein the transparent substrate is a rigid substrate or a flexible substrate. The touch panel capable of reducing the Murray effect according to the first aspect of the patent application, wherein the first metal mesh or the second metal mesh has a mesh width of between 0.2 and 3.0 mm. The touch panel capable of reducing the Murray effect according to the first aspect of the patent application, wherein the lines forming the nodes in the first metal mesh or the second metal mesh are mainly composed of curvature or A line of slopes. The touch panel capable of reducing the Murray effect according to the first aspect of the patent application, wherein the angle between the first metal line without the sensing function and the second metal line having the non-inductive function is interlaced The system is within a suitable range of angles and is configured in a random manner over the appropriate range of angles. According to the seventh aspect of the patent application, the touch panel capable of reducing the Murray effect, wherein the appropriate angle ranges from 75 to 125 degrees. The touch panel capable of reducing the Murray effect according to claim 7 or 8, wherein the non-inductive first metal line and the non-inductive second metal line are not pure straight lines but An approximately straight line with curvature or slope.