TWI451313B - Capacitor type touch panel - Google Patents

Description

Capacitive touch panel

The present invention relates to a light transmissive touch panel, and more particularly to a touch panel having a capacitor circuit.

Touch panels have been widely used in household appliances, communication devices, and electronic information devices. Typically, touch panel applications are used as input interfaces for personal digital assistants (PDAs), electronics, and gaming consoles. At present, the integration trend of the touch panel and the display screen allows the user to select a representative icon displayed on the panel with a finger or a touch pen, so that the personal digital assistant, the electronic product, and the game machine can perform the favorite function. Such a touch panel is also applied to a public information inquiry system, which can provide an efficient operating system for the public.

The conventional touch panel includes a transparent substrate having a surface formed by a plurality of sensing pads for sensing a signal caused by a user touching with a finger or a touch pen. Make input or control. The sensing pad is composed of a transparent conductive film, such as indium tin oxide (ITO), and the user can operate the device by touching a corresponding transparent conductive film displayed at a specific position on the display screen.

In order to effectively detect the correct position of the user touching the panel with a finger or a touch pen, a variety of touch panel technologies have been developed. As shown in FIG. 1A , a light transmissive touch panel 10 includes a transparent substrate 11 , a plurality of bridge wires 12 , an insulating layer 13 , and a transparent conductive layer 14 . The transparent conductive layer 14 covers the upper surface of the transparent substrate 11 and includes a plurality of first units 141, a plurality of second units 142, and a plurality of connecting lines 143. The plurality of first units 141 and the plurality of second units 142 are staggered, and each of the first units 141 is surrounded by four second units 142. Each of the plurality of connecting lines 143 is connected to the adjacent second unit 142. The insulating layer 13 further includes a plurality of insulating regions 131, and the plurality of insulating regions 131 respectively cover the plurality of connecting lines 143. The plurality of bridge wires 12 are respectively disposed on the plurality of insulating regions 131, and are respectively connected to the adjacent first cells 141. A plurality of metal wires 15 are disposed on the peripheral side of the transparent conductive layer 14. The plurality of metal wires 15 enable the horizontal and vertical connections of the first unit 141 and the second unit 142 to transmit the sensed signals to external.

However, since the plurality of bridge wires 12 and the plurality of metal wires 15 are metal materials that can reflect light, when the light is penetrated through the touch panel 10 to select or control the lower display screen, the bridge wires 12 and the metal wires are used. 15 will reflect the light to form a bright band or bright line, which causes the user to watch the display screen or visually uncomfortable.

In addition, a conventional technique adds a lens to the light-transmitting touch panel 10, and a black matrix is placed between the lens and the light-transmitting touch panel 10, and the black matrix just covers the periphery. The area where the metal wire is located can block a plurality of concentrated metal wires to form a bright band of reflected light. However, the lens and the transparent substrate 11 through which the light penetrates the touch panel 10 are all made of the same glass material, so that not only materials and manufacturing steps are consumed, but also more light on the display screen is absorbed to cause image darkening.

Therefore, there is a need in the market for a touch panel that overcomes the shortcomings of the conventional touch panel described above and still maintains a low manufacturing cost.

The invention provides a light-transmitting touch panel, and the bridge wire of the touch panel overlaps with the light shielding layer, so that no bright spots or bright lines are generated in the sensing area.

In summary, the present invention discloses a capacitive touch panel comprising a transparent substrate, a light shielding layer and a capacitive sensing circuit component. The capacitive sensing circuit component is disposed on a surface of one of the transparent substrates and includes a sensing region and a plurality of metal wires. The sensing region includes a plurality of metal bridge wires. The plurality of metal wires are located around the sensing region and are electrically connected to the sensing region. The area of the light shielding layer and the plurality of metal bridge lines vertically overlap.

In one embodiment of the present invention, the light shielding layer is directly disposed on a surface of the transparent substrate, and the capacitive sensing circuit component is directly stacked on the light shielding layer.

In one embodiment of the present invention, the light shielding layer is disposed on a surface of the transparent substrate, and the capacitance sensing circuit component is disposed on the other surface of the transparent substrate.

In one example of the present invention, the light shielding layer is directly disposed on a surface of the plurality of metal bridge wires in the sensing region.

2A is a schematic cross-sectional view of a touch panel according to an embodiment of the invention. As shown in FIG. 2A , a capacitive touch panel 20 includes a transparent substrate 21 , an insulating layer 23 , a light shielding layer 25 , and a capacitive sensing circuit component 26 . The capacitive sensing circuit component 26 is disposed on the first surface 211 of the transparent substrate 21 and includes a sensing region 262 and a plurality of metal wires 263. The sensing region 262 includes a plurality of metal bridge wires 264 and a transparent conductive layer 265. A plurality of metal wires 263 are located around the sensing region 262 and are electrically connected to the sensing region 262. The light shielding layer 25 is directly disposed on the first surface 211 of the transparent substrate, that is, between the capacitive sensing circuit component 26 and the transparent substrate 21, and the area of the light shielding layer 25 and the A plurality of metal bridge wires 264 are vertically overlapped. Therefore, when the user views and uses the capacitive touch panel 20 from the second surface 212 of the transparent substrate 21, the light shielding layer 25 blocks the metal bridge wire 264, thereby eliminating or reducing the reflection of the metal bridge wire 264. The problem of light, that is, there are no bright spots or bright lines in the sensing area 262.

The material of the transparent substrate 21 is glass or a transparent polymer sheet, such as polycarbonate (PC) and polyvinyl chloride (PVC). The material of the transparent conductive layer 265 and the bridge wire 264 is indium tin oxide (ITO), aluminum zinc oxide (AZO) or indium zinc oxide (IZO). The metal bridge wire 264 and the metal wire 263 are made of a composite metal layer of chromium (Cr) or molybdenum/aluminum/molybdenum (Mo/Al/Mo). The material of the light shielding layer 25 is chrome oxide (CrO) or a polymer opaque or translucent material. The material of the insulating layer 23 is a transparent polymer material, such as a photoresist material.

2B is a schematic cross-sectional view of a touch panel according to another embodiment of the present invention. As shown in FIG. 2B, a capacitive touch panel 20' includes a transparent substrate 21, an insulating layer 23, a light shielding layer 25', and a capacitive sensing circuit component 26. The capacitive sensing circuit component 26 is disposed on the first surface 211 of the transparent substrate 21 and includes a sensing region 262 and a plurality of metal wires 263. The sensing region 262 includes a plurality of metal bridge wires 264 and a transparent conductive layer 265. A plurality of metal wires 263 are located around the sensing region 262 and are electrically connected to the sensing region 262. The light shielding layer 25 ′ is directly disposed on the first surface 211 of the transparent substrate, that is, between the capacitive sensing circuit component 26 and the transparent substrate 21 , and the area of the light shielding layer 25 ′ is The plurality of metal bridge wires 264 and the plurality of metal wires 263 are vertically overlapped. Therefore, when the user views and uses the capacitive touch panel 20 from the second surface 212 of the transparent substrate 21, the light shielding layer 25 blocks the metal bridge wire 264 and the plurality of metal wires 263, thus eliminating the The metal bridge wire 264 and the plurality of metal wires 27 reflect the problem of light, that is, there are no bright spots, bright lines, or bright bands. Compared with FIG. 2A, the light shielding layer 25' in FIG. 2B increases the shielding area of the plurality of metal wires 263 around the capacitive touch panel 20'.

3 is a cross-sectional view of a touch panel in accordance with an embodiment of the present invention. The light shielding layer 25 of the capacitive touch panel 30 of FIG. 3 is disposed in the capacitive sensing circuit component 26, that is, the plurality of metal bridge wires 264 and the transparent conductive layer 265. Between, but also to avoid the effect of the plurality of metal bridge wiring 264 reflecting light.

4 is a cross-sectional view of a touch panel in accordance with an embodiment of the present invention. The light shielding layer 25 of the capacitive touch panel 40 is disposed above the plurality of metal bridge wires 264, that is, between the insulating layer 23 and the plurality of metal bridge wires 264. The user is more suitable to view and operate the capacitive touch panel 40 from one end of the insulating layer 23 .

FIG. 5A is a schematic cross-sectional view of a touch panel according to an embodiment of the invention. The light shielding layer 25 of the capacitive touch panel 50 is disposed on the second surface 212 of the transparent substrate 21 , that is, the capacitive sensing circuit component 26 is disposed on the transparent substrate 21 . Relative surface. The effect of avoiding the reflection of light by the plurality of metal bridge wires 214 can also be achieved.

Compared with FIG. 5A, the light shielding layer 25' of the capacitive touch panel 50' of FIG. 5B increases the shielding area of the plurality of metal wires 263 around the capacitive touch panel 50', thereby eliminating the metal bridge wiring. 264 and the plurality of metal wires 263 reflect the problem of light, that is, no bright spots, bright lines or bright bands are generated.

The technical and technical features of the present invention have been disclosed as above, and those skilled in the art can still make various substitutions and modifications without departing from the spirit and scope of the invention. Therefore, the scope of the present invention should be construed as being limited by the scope of the appended claims

10. . . Touch panel

11. . . Transparent substrate

12. . . Bridge wiring

13. . . Insulation

14. . . Transparent conductive layer

15. . . Metal wire

131. . . Insulated area

141. . . The first unit

142. . . Second unit

143. . . Cable

20, 20', 30, 40, 50, 50'. . . Capacitive touch panel

twenty one. . . Transparent substrate

twenty three. . . Insulation

25, 25'. . . Light shielding layer

26. . . Capacitive sensing circuit component

211. . . First surface

212. . . Second surface

262. . . Sensing area

263. . . Metal wire

264. . . Bridge wiring

265. . . Transparent conductive layer

1A is a schematic view of a conventional touch panel;

Figure 1B is a cross-sectional view taken along line 1-1 of Figure 1A;

2A is a schematic cross-sectional view of a touch panel according to an embodiment of the invention;

2B is a schematic cross-sectional view of a touch panel according to another embodiment of the present invention;

3 is a schematic cross-sectional view of a touch panel according to an embodiment of the invention;

4 is a schematic cross-sectional view of a touch panel according to an embodiment of the invention;

5A is a schematic cross-sectional view of a touch panel according to an embodiment of the present invention;

FIG. 5B is a schematic cross-sectional view of a touch panel according to another embodiment of the present invention.

20. . . Capacitive touch panel

twenty one. . . Transparent substrate

twenty three. . . Insulation

25. . . Light shielding layer

26. . . Capacitive sensing circuit component

211. . . First surface

212. . . Second surface

262. . . Sensing area

263. . . Metal wire

264. . . Bridge wiring

265. . . Transparent conductive layer

Claims (12)

A capacitive touch panel comprising: a transparent substrate; a capacitive sensing circuit component disposed on the first surface of the transparent substrate, comprising a sensing region and a plurality of metal wires located around the sensing region, The sensing region includes a plurality of metal bridge wires; and a light shielding layer vertically overlapping the plurality of metal bridge wires, wherein the light shielding layer has a plurality of holes, and the holes are vertically There is no overlap with the metal bridge wires. The capacitive touch panel of claim 1, wherein the light shielding layer is directly disposed on the first surface of the transparent substrate, and the capacitive sensing circuit component is directly stacked on the light shielding layer. The capacitive touch panel of claim 1, wherein the light shielding layer is disposed above the second surface of the transparent substrate, and the second surface and the first surface are opposite surfaces. The capacitive touch panel of claim 1, wherein the capacitive sensing circuit component further comprises a transparent conductive layer, and the plurality of metal bridge wires and the plurality of metal wires are disposed above the transparent conductive layer. The capacitive touch panel of claim 1, wherein the light shielding layer is directly disposed on a surface of the plurality of metal bridge wires. The capacitive touch panel of claim 4, wherein the light shielding layer is sandwiched between the transparent conductive layer and the plurality of metal bridge wires. The capacitive touch panel of claim 4, further comprising an insulating layer covering the transparent conductive layer, the plurality of metal bridge wires, and the plurality of metal wires. The capacitive touch panel of claim 7, wherein the light shielding layer is sandwiched between the plurality of metal bridge wires and the insulating layer. The capacitive touch panel of claim 1, wherein the light shielding layer further comprises an area vertically overlapping the plurality of metal wires. The capacitive touch panel of claim 1, wherein the metal bridge wire and the metal wire are made of a composite metal layer of chromium (Cr) or molybdenum/aluminum/molybdenum (Mo/Al/Mo). The capacitive touch panel of claim 4, wherein the material of the transparent conductive layer is a conductive oxide. The capacitive touch panel of claim 1, wherein the material of the transparent substrate is glass or a transparent polymer material.