TWI601043B - Touch panel with non-sensing metal lines - Google Patents

Description

Touch panel with sensorless metal lines

A touch panel having a metal line without sensing function, 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 only required to be fabricated using a film mask, so that it is not necessary Use glass reticle to save production costs

The capacitive touch panel detects the touch position of a finger or a conductive object by a change in the capacitance value caused by the user touching the capacitive touch panel through a finger or a conductive object. Further, the capacitive touch panel generally has a double-layered sensing electrode electrically insulated from each other. When the user has not touched the touch panel, there is an initial value of capacitance between the double-layered sensing electrodes. When the user touches the touch panel, the capacitance value changes between the double-layered sensing electrodes due to the charge taken by the human body, thereby changing the original initial value of the capacitance. At this time, it is possible to determine the position touched by the user by calculating the amount of change in capacitance of each of the sensing electrodes.

In the conventional capacitive touch panel technology, the sensing electrode is generally formed by a transparent conductive material such as indium tin oxide (ITO). Since the resistivity of the transparent conductive material is generally higher than that of the metal conductive material, transparent use is used. When the conductive material forms the sensing electrode, the overall resistance is too high and the reaction speed is affected. Therefore, there is currently a metal mesh interwoven with metal lines instead of a transparent conductive material to form a sensing electrode to improve the reaction speed.

However, when the metal grid of the touch panel is applied to the display panel, a 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.

However, in order to have a metal wire having a line width of between 1 micrometer and 3 micrometers, a high-resolution glass mask has to be used to fabricate a metal mesh, but the cost of the glass mask is expensive, resulting in an initial development and manufacturing cost increase. high.

Another method of making metal mesh is to use a film mask (refer to Figure A), but the film mask 1a has a lower resolution than the glass mask, so it is online with respect to the glass mask. The intersection with the line may be enlarged, and the metal mesh 1b (as shown in the first B) produced through the exposure and development etching process through the film mask 1a has a line width of only 5 to 8 μm, and At the intersection of the line and the line, a large number of nodes N are formed, which affects the transmittance and causes a diffraction phenomenon when the light passes through the node, which seriously affects the display effect.

Although the cost of the thin film mask is low, the metal grid formed by the thin film mask has a wide line width and a large node area, which easily causes a decrease in transmittance and makes the interference fringe relatively obvious, although a high-resolution glass mask can be fabricated. The metal mesh with thin line width and high mesh density effectively avoids the generation of interference fringes, but the cost of the high-resolution glass mask is too expensive, and the variation of the capacitance value is too small, so that the touch sensitivity of the touch panel cannot be broken.

In summary, when it can effectively prevent the generation of interference fringes, it brings touch The sensitivity cannot be broken and the manufacturing cost is high. When the touch sensitivity is improved and the manufacturing cost is lowered, the problem of interference fringes appears. Therefore, it is necessary to provide a touch that can prevent the generation of interference fringes while improving the touch sensitivity. panel.

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.

To achieve the above objective, the touch panel with the non-inductive metal line of the present invention comprises a transparent substrate, comprising a visible touch area and a peripheral line area, the peripheral line area being at the edge of the transparent substrate and the visible Between the touch areas, a first sensing electrode is disposed on a first surface of the transparent substrate, the first sensing electrode extends in a first direction, and the first sensing electrode includes a plurality of first sensing An electrode and a plurality of first metal leads, wherein the first sensing electrodes are located in the visible touch region and extend along the first direction, and the first metal leads are located in the peripheral circuit region, the first The sensing electrodes are electrically connected to the first metal leads, wherein the adjacent two first sensing electrodes are not connected to each other, and the first sensing electrodes comprise a plurality of first metal grids, wherein the first metal grid a first metal line having a plurality of non-inductive functions is disposed, and the first metal lines of the non-inductive function are not connected to the first metal mesh, and the first metal lines without the sensing function are spaced apart from each other. One second The first electrode and the second surface need to correspond to each other, and the second sensing electrode extends in a second direction, and the second sensing electrode includes a plurality of electrodes. a second sensing electrode and a plurality of second metal leads, wherein the second sensing electrodes are located in the visible touch area and extend along the second direction, and the second metal leads are located in the peripheral circuit area The second sensing electrodes are electrically charged Connected to the second metal leads, wherein the adjacent two second sensing electrodes are not connected to each other, and the second sensing electrode comprises a plurality of second metal grids, wherein a plurality of second metal grids are arranged in a plurality of The second metal line of the sensing function is not connected to the second metal mesh at the two ends of the non-inductive function, and the second metal lines without the sensing function are spaced apart from each other.

The first sensing electrode and the second sensing electrode are in an opposite arrangement relationship, and the first metal mesh and the second metal mesh form an interlaced relative arrangement relationship, and the non-inductive functions are The first metal line and the second metal lines having no inductive function are also interdigitated relative arrangement relationship.

The first main feature of the present invention is 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 because the mesh pitch is increased. And to achieve the purpose of improving the recognition of touch signals.

The second main feature of the present invention is that a first metal line interlaced and non-sensing function and a second metal line without sensing function are separately arranged in the first metal grid and the second metal grid, and the The mesh width of the first metal mesh or the second metal mesh is increased to improve the touch signal recognition, but only increasing the mesh width causes the metal mesh density to be insufficient to make the mesh visible to the naked eye. And the first metal line and the second metal line having the non-inductive function are disposed in the first metal mesh and the second metal mesh, such that the first sensing electrode and the second sensing The grid density of the electrodes is kept to a level that is not perceived by the naked eye.

The third main feature of the case is that since the metal lines without induction function are not connected to the metal mesh, the number of nodes is reduced, and the first metal mesh and the first metal wire without sensing function are mentioned in the upper section. a second metal grid and a second metal line without induction There is no node at the intersection of the corresponding settings, so there is no need to use a high-resolution glass reticle. A thin film mask (such as a negative film) can be used to make a metal mesh with few nodes. Grid, greatly improve the transparency, and effectively improve the display effect, but also because the cost of the film mask is much lower than the glass reticle, it can also effectively reduce the production cost.

1‧‧‧Touch panel with sensorless metal lines

10‧‧‧Transparent substrate

11‧‧‧First sensing electrode

12‧‧‧Second sensing electrode

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

P‧‧‧ staggered pattern

N‧‧‧ node

1a‧‧‧film mask

The first A is a schematic view of a conventional film mask.

The first B is a schematic view of a metal grid made by a conventional film through a film mask exposure and development etching process.

The second figure is a schematic view of a touch panel having a metal line without sensing function according to the present invention.

The third figure is an enlarged schematic view of the first sensing electrode and its partial area A.

The fourth figure is an enlarged schematic view of the second sensing electrode and its partial area B.

The fifth figure is an enlarged schematic view of the partial area C of the second figure.

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 the second figure, the second figure is a schematic diagram of a touch panel having a metal line without sensing function. As shown in the second figure, the touch panel 1 having the non-inductive metal line includes at least one transparent substrate 10, a first sensing electrode 11 and a second sensing electrode 12, wherein the transparent substrate 10 includes a visible 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 non-edge region, the peripheral line region L is an edge region 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 visible 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 electrode 11 and the second sensing electrode 12 are respectively 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, such as each other. Corresponding to the upper surface and the lower surface, the upper surface or the lower surface of the transparent substrate 10 may be disposed on the upper surface or the lower surface of the transparent substrate 10, and then the optical adhesives (not shown) are attached to each other according to their relative positions, so the first sensing electrode 11 and the second sensing electrode 12 can achieve the present invention by providing the first sensing electrode 11 and the second sensing electrode 12 on a single or a plurality of substrates as long as part or all of them are in parallel relative positions. purpose.

Please note that the material of the first sensing electrode 11 or the second sensing electrode 12 is at least one of copper gold, aluminum, copper, silver, chromium, titanium, molybdenum, niobium, nickel and an alloy of the above metals.

The first sensing electrode 11 or the second sensing electrode 12 is a film mask or glass The glare is exposed.

Referring to the third figure, the third figure is an enlarged schematic view of the first sensing electrode and its partial area A, and is shown in the second figure. The second figure shows that the first sensing electrode 11 extends in a first direction Y-axis. Extendingly, the first sensing electrode 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 along the first direction. Y is axially extended, and the first metal leads 113 are located in the peripheral line region L. 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 the second figure indicates that there is a gap between the adjacent two first sensing electrodes 111, because the second figure is a metal line with no sensing function. For the actual structure of the first sensing electrode 111, please refer to the enlarged view of the partial area A of the third figure. As shown in the partial area A, the first sensing electrode 111 includes a first metal mesh 111A, wherein a first metal mesh 111A is provided with a plurality of first metal wires 111B having no sensing function, and the non-inductive first metal wires 111B are not connected at both ends The first metal mesh 111A, and the non-inductive first metal lines 111B are spaced apart from each other.

Referring to the fourth figure, the fourth figure is an enlarged schematic view of the second sensing electrode and its partial area B, and is shown in the second figure, wherein the second figure shows that the second sensing electrode 12 extends in a second direction X-axis. The second sensing electrode 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 are extended. The second sensing electrode 121 is electrically connected to the second metal wires 123.

The adjacent two second sensing electrodes 121 are not connected to each other, and the horizontal direction in the second figure The dotted line indicates that there is a gap between the adjacent two second sensing electrodes 121, because the second figure is a giant view of the touch panel having the metal line without induction function, and the actual structure of the second sensing electrode 121 is Referring to the enlarged view of the partial area B of the fourth figure, as shown in the partial area B, the second sensing electrode 121 includes a plurality of second metal meshes 121A, wherein a second metal grid 121A is disposed. a second metal line 121B having a plurality of non-inductive functions, the two non-inductive second metal lines 121B are not connected to the second metal grid 121A, and the non-inductive second metal lines 121B are apart from each other. An interval.

The grid width of the first metal mesh 111A or the second metal mesh 121A is between 1.0 and 3.0 mm.

Referring to the fifth figure, the fifth figure is an enlarged schematic view of the partial area C of the second figure. The first sensing electrode 11 and the second sensing electrode 12 are disposed in an opposing relationship of up, down, left, and right, and the first metal grid 111A and the second metal are as shown in FIG. 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 The first metal line 111B of the function and the second metal line 121B of the non-inductive function are also in an interlaced relative arrangement relationship, the first metal line 111B without the sensing function and the second metal line without the sensing function. 121B will jointly form a staggered pattern P (from a top view), but from a side view, it is a superimposed relationship (via the transparent substrate 10); the staggered pattern P contains at least a cross or a cross shape, such as As shown in the embodiment of the fifth figure, the staggered pattern P of the non-inductive first metal line 111B and the non-inductive second metal line 121B is composed of a plurality of wells or a plurality of crosses. Constitute and make each other When a higher density is formed, and also equal to the grid spacing, and therefore the whole of the first sensing electrode 11 and second sensing electrode 12 to The interleaved relative configuration relationships form a dense and symmetrical grid shape.

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 metal mesh has a quadrangular shape or a diamond shape.

The first main feature of the present invention is that the mesh width of the first metal mesh 111A or the second metal mesh 121A is greater than 1.8 mm, which can increase the variation of the capacitance value, thereby achieving improved touch signal recognition. the goal of.

The second main feature of the present invention is that the first metal line 111B and the second metal line 121B having no sensing function are separately arranged in the first metal grid 111A and the second metal grid 121A. In the above paragraph, the mesh width of the first metal mesh 111A or the second metal mesh 121A 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 111B and the second metal wire 121B having the non-inductive function are disposed in the first metal mesh 111A and the second metal mesh 121A, such that the The mesh density of the first sensing electrode 111 and the second sensing electrode 121 is maintained to a degree that is not perceived by the naked eye.

The third main feature of the case is that since the metal line without induction function is not connected to the metal mesh, the number of nodes is reduced, and the first metal mesh 111A mentioned in the upper paragraph is And the non-inductive first metal line 111B and the second metal grid 121A and the non-inductive second metal line 121B do not have nodes at the intersections of the corresponding arrangement, so there is no need Using a high-resolution glass reticle, a thin film reticle (such as a negative film) can be used to make a metal mesh with few nodes, which greatly improves the transparency and effectively enhances the display effect, also due to the thin film reticle. The cost is much lower than that of the glass mask, which 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.

111‧‧‧First sensing electrode

111A‧‧‧First Metal Grid

111B‧‧‧First metal wire without induction

121‧‧‧Second sensing electrode

121A‧‧‧Second metal grid

121B‧‧‧Second metal lines without induction

P‧‧‧ staggered pattern

Claims (7)

A touch panel having a non-inductive metal line includes: a transparent substrate comprising a visible touch area and a peripheral line area, the peripheral line area being between the edge of the transparent substrate and the visible touch area a first sensing electrode is disposed on a first surface of the transparent substrate, the first sensing electrode extends in a first direction, and the first sensing electrode includes a plurality of first sensing electrodes and a plurality of first a metal lead, the first sensing electrodes are located in the visible touch area and extend along the first direction, and the first metal leads are located in the peripheral circuit area, and the first sensing electrodes are electrically connected Connected to the first metal leads, wherein the adjacent two first sensing electrodes are not connected to each other, the first sensing electrode comprises a plurality of first metal grids, wherein a plurality of first metal grids are arranged in a plurality of a first metal line of the sensing function, the first metal lines of the non-inductive function are not connected to the first metal mesh, and the first metal lines without the sensing function are spaced apart from each other; a second sensing Electrode, setting On the second surface of the transparent substrate, the first surface and the second surface need to correspond to each other, the second sensing electrode extends in a second direction, and the second sensing electrode includes a plurality of second sensing electrodes And a plurality of second metal leads, the second sensing electrodes are located in the visible touch area and extending along the second direction, and the second metal leads are located in the peripheral circuit area, the second The sensing electrodes are electrically connected to the second metal leads, wherein the adjacent two second sensing electrodes are not connected to each other, and the second sensing electrodes comprise a plurality of second metal grids, wherein the second metal grid a second metal line having a plurality of non-inductive functions is disposed, the two ends of the non-inductive second metal lines are not connected to the second metal grid, and the second metal lines without the sensing function are spaced apart from each other ; The first sensing electrode and the second sensing electrode are in an opposite arrangement relationship, and the first metal mesh and the second metal mesh are opposite to each other to form an interlaced relative arrangement relationship, and the non-inductive The first metal line of the function and the second metal line of the non-inductive function are also in an interlaced relative arrangement relationship, wherein the first sensing electrode or the second sensing electrode is exposed by a film mask, the first metal The grid width of the grid or the second metal grid is between 1.0 and 3.0 mm. The touch panel having the non-inductive metal line according to claim 1, 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. A touch panel having a non-inductive metal line according to claim 1, wherein the transparent substrate is a rigid substrate or a flexible substrate. The touch panel having the non-inductive metal line according to claim 1, wherein the non-inductive first metal line forms a staggered pattern with the non-inductive second metal lines. A touch panel having a non-inductive metal line according to claim 4, wherein the staggered pattern includes at least a cross or a cross shape. According to the touch panel of claim 1, wherein the first metal lines of the non-inductive first metal lines are adjacent to each other. Between 0.2 mm and 0.6 mm, and the non-inductive first metal line in the first metal line of the non-inductive function is spaced from the first metal grid by 0.2 Between mm~0.6mm. A touch surface having a non-inductive metal line according to claim 1 of the patent application scope a plate, wherein the spacing between any two adjacent second metal lines of the non-inductive second metal lines is between 0.2 mm and 0.6 mm, and the second metal lines having no inductive function are close to The non-inductive second metal line of the second metal mesh and the second metal mesh have a spacing of between 0.2 mm and 0.6 mm.