CN102621728A - Touch device with shielding layer - Google Patents

Abstract

The invention discloses a touch device with a shielding layer. The touch device comprises a touch module and a display module. The display module comprises a thin film transistor substrate, a color filter substrate, a liquid crystal layer, a first polaroid, a second polaroid and a shielding layer. The shielding layer can be arranged between the color filter substrate and the second polarizer or arranged on the second polarizer. The touch module comprises an upper cover substrate, a plurality of sensing pads and a protective layer. The plurality of sensing pads are formed on the lower side of the upper cover substrate. The grounding voltage of the sensing pads is electrically connected to the shielding layer to block the noise generated by the display module to the touch module.

Description

Touch device with shield

technical field

The invention relates to a touch device, in particular to a touch device with a shielding layer to improve the noise generated by the display module to the touch module.

Background technique

The touch control principles in the touch panel are mainly divided into: resistive, capacitive, sonic and infrared, among which the resistive and capacitive are more widely used in the industry. The resistive touch panel is composed of two conductive sheets, and a number of spacers are distributed in the middle of the two conductive sheets, so that the two conductive sheets are in a non-conductive state when they are not touched. When the conductive sheet is pushed out by the contact pressure and the spacer below the pressure point is formed to form a conduction between the upper and lower conductive sheets, the coordinates of the pressure point can be obtained by measuring the relationship between the resistance in the conduction loop and the applied bias voltage . Compared with the resistive touch panel that needs bias voltage, the action principle of the capacitive touch panel comes from the capacitance change extended when the finger or conductor touches the touch panel. When the conductor or finger touches the surface of the insulating layer, the lower part Based on this, the distributed capacitance sensing pad can measure the difference in capacitance generated when the finger/conductor is in contact, so as to calculate the coordinates of the contact point.

Please refer to FIG. 1 , which is a schematic diagram of a capacitive touch device in the background art. The touch device 100 includes a touch module 110 and a display module 120 . The display module 120 includes a first polarizer 121 , a TFT substrate 122 , a liquid crystal layer 123 , a color filter substrate 124 and a second polarizer 125 . The liquid crystal layer 123 is disposed between the TFT substrate 122 and the color filter substrate 124 , the first polarizer 121 is attached to the TFT substrate 122 , and the second polarizer 125 is attached to the color filter substrate 124 . The touch module 110 is attached to the display module 120 through the adhesive layer 131 . The touch module 110 includes a cover substrate 111 , a plurality of sensor patterns 112 , a protection layer 113 , a sensor glass 114 and a shielding layer 115 . The sensing substrate 114 is made of glass, and can utilize indium tin oxide (Indium Tin Oxide, ITO) sputtering (sputtering) to form the shielding layer 115 below the sensing substrate 114. Since the thickness of the sensing substrate 114 is about 1mm, Excessive coupling capacitance will not be generated between the shielding layer 115 and the sensing pad 112 to affect touch sensing. The plurality of sensing pads 112 are used to sense the position of the touch. When the sensing capacitance is generated between the sensing pads 112 due to the touch, the position of the touch can be determined through the change of the capacitance value. A plurality of sensing pads 112 are formed on the sensing substrate 114, the plurality of sensing pads 112 have a protective layer 113, the upper cover substrate 111 is disposed above the protective layer 113, and the user touches on the upper side of the upper cover substrate 111 operation, so the upper cover substrate 111 is made of wear-resistant and scratch-resistant material. The shielding layer 115 is disposed on the lower side of the sensing substrate 114 . The ground voltage of the plurality of sensing pads 112 is electrically connected to the shielding layer 115 . The shielding layer 115 can block the noise generated by the display module 120 to the touch module 110 .

The above-mentioned touch module 110 has a double-layer substrate structure, that is, the touch module 110 includes a cover substrate 111 and a sensing substrate 114 , and a plurality of sensing pads 112 are formed on the sensing substrate 114 . However, in order to reduce the thickness of the touch device, many touch devices use a touch module with a single-layer substrate structure, that is, a plurality of sensing pads are directly formed on the lower side of the upper cover substrate, and the sensing pads are covered with a protective layer. Since the thickness of the protective layer is about several micrometers (10 ⁻⁶ m), if the shielding layer is disposed on the protective layer, excessive coupling capacitance will be generated between the shielding layer and the sensing pad, which will affect touch sensing. However, if no shielding layer is provided, the noise generated by the display module will seriously affect the sensing of the touch module.

Contents of the invention

Therefore, an object of the present invention is to provide a touch device with a shielding layer to solve the above problems.

The invention provides a touch device, which includes a display module and a touch module. The display module includes a thin film transistor substrate, a color filter substrate, a liquid crystal layer, a first polarizer, a shielding layer and a second polarizer. The liquid crystal layer is disposed between the thin film transistor substrate and the color filter substrate. The first polarizer is attached to the TFT substrate. The shielding layer is disposed on the color filter substrate. The second polarizer is attached on the shielding layer. The touch module includes an upper cover substrate, a plurality of sensing pads and a protection layer. The plurality of sensing pads are formed on the lower side of the upper cover substrate, and the plurality of sensing pads are electrically connected to the shielding layer. The protection layer is formed on the plurality of sensing pads, and the thickness of the protection layer is about several micrometers (10 ⁻⁶ m), and the lower side of the protection layer is attached to the display module through a glue layer.

The present invention further provides a touch device, which includes a display module and a touch module. The display module includes a thin film transistor substrate, a color filter substrate, a liquid crystal layer, a first polarizer, a second polarizer and a shielding layer. The liquid crystal layer is disposed between the thin film transistor substrate and the color filter substrate. The first polarizer is attached to the TFT substrate. The second polarizer is attached to the color filter substrate. The shielding layer is disposed on the second polarizer. The touch module includes an upper cover substrate, a plurality of sensing pads and a protection layer. The plurality of sensing pads are formed on the lower side of the upper cover substrate, and the plurality of sensing pads are electrically connected to the shielding layer. The protection layer is formed on the plurality of sensing pads, and the thickness of the protection layer is about several micrometers (10 ⁻⁶ m), and the lower side of the protection layer is attached to the display module through a glue layer.

Description of drawings

1 is a schematic diagram of a capacitive touch device of the background art;

2 is a schematic diagram of a first embodiment of the touch device of the present invention;

3 is a schematic diagram of the ground voltage of the touch device of the present invention;

4 is a schematic diagram of the touch area and the display area of the touch device of the present invention;

FIG. 5 is a schematic diagram of a second embodiment of the touch device of the present invention.

Description of main component symbols

100, 200, 500 touch devices

110, 210, 510 Touch Module

111, 211, 511 Upper cover substrate

112, 212, 512 Multiple sensing pads

113, 213, 513 protective layer

114 Sensing substrate

120, 220, 520 Display Module

121, 221, 521 first polarizer

122, 222, 522 Thin film transistor substrate

123, 223, 523 Liquid crystal layer

124, 224, 524 Color filter substrate

125, 225, 525 Second polarizer

115, 226, 526 Shielding layer

131, 231, 531 glued layer

217 Touch Area

227 Display area

310 Flexible printed circuit board

311 Ground voltage zone

321, 322, 323 Ground voltage

Detailed ways

Please refer to FIG. 2 , which is a schematic diagram of a first embodiment of the touch device of the present invention. The touch device 200 includes a touch module 210 and a display module 220 . The display module 220 includes a first polarizer 221 , a TFT substrate 222 , a liquid crystal layer 223 , a color filter substrate 224 , a second polarizer 225 and a shielding layer 226 . The liquid crystal layer 223 is arranged between the thin film transistor substrate 222 and the color filter substrate 224, the first polarizer 221 is attached on the thin film transistor substrate 222, the shielding layer 226 is arranged on the color filter substrate 224, and the second polarizer 225 is attached to the shielding layer 226. The touch module 210 includes a cover substrate 211 , a plurality of sensing pads 212 and a protection layer 213 . The lower side of the upper cover substrate 211 is attached to the display module 220 through the adhesive layer 231 , a plurality of sensing pads 212 are formed on the lower side of the upper cover substrate 211 , and a protective layer 213 is formed on the plurality of sensing pads 212 . The touch module 210 has a single-layer substrate structure, that is, a plurality of sensing pads 212 are directly formed on the lower side of the upper cover substrate 211 . Since the thickness of the protection layer 213 is about several micrometers (10 ⁻⁶ m), no shielding layer can be disposed on the protection layer 213 . Therefore, in the touch device 200 of the present invention, the shielding layer 226 is disposed in the display module 220, and the ground voltage of the touch module 210 is electrically connected to the shielding layer 226, so as to block the noise generated by the display module 220 to the touch module 210. . In this embodiment, the shielding layer 226 includes two implementations. The first way is to use a conductive layer of polyethylene terephthalate (Polyethyleneterephthalate, PET) film to form the shielding layer 226 and attach it to the color filter. On the color filter substrate 224 , the second method is to form a shielding layer 226 and deposit it on the color filter substrate 224 by using an indium tin oxide (Indium Tin Oxide, ITO) manufacturing process.

Please refer to FIG. 3 . FIG. 3 is a schematic diagram of the ground voltage of the touch device of the present invention. The touch device 200 further includes a flexible circuit board 310 having a ground voltage region 311 on the flexible circuit board 310 . The touch module 210 and the display module 220 have ground voltages 321 and 322 respectively. The ground voltage 321 of the plurality of sensing pads 212 of the touch module 210 is electrically connected to the ground voltage area 311 of the flexible printed circuit board 310, and the ground voltage of the shielding layer 226 is The voltage 323 is electrically connected to the ground voltage region 311 of the flexible circuit board 310 , so the ground voltage 321 of the plurality of sensing pads 212 is electrically connected to the shielding layer 226 through the flexible circuit board 310 . For the touch device 200, the touch module 210 and the display module 220 have the same ground voltage, so the ground voltage 322 of the display module 220 is electrically connected to the ground voltage region 311 of the flexible circuit board 310, that is, the thin film transistor substrate 222 The flexible printed circuit board 310 is grounded to the ground voltage region 311 , so that the shielding layer 226 and the TFT substrate 222 have the same ground potential. In this way, the ground voltages 321 and 322 of the touch module 210 and the display module 220 can be electrically connected together through the ground voltage area 311 of the flexible circuit board 310 . Since the touch device 200 of the present invention uses a touch module 210 with a single-layer structure, a shielding layer cannot be provided on the touch module 210. However, a shielding layer 226 is provided on the display module 220, and multiple sensing layers are connected through the flexible circuit board 310. The ground voltage 321 of the pad 212 is electrically connected to the shielding layer 226 , so the touch device 200 can block the noise generated by the display module 220 to the touch module 210 through the shielding layer 226 .

Please refer to FIG. 4 , which is a schematic diagram of the touch area and the display area of the touch device of the present invention. The touch device 200 of the present invention includes a single-layer touch module 210 and a display module 220, the touch module 210 is attached to the display module 220 through the glue layer 231, and the display module 220 has a shielding layer 226 to block the display module. 220 generates noise to the touch module 210 . The touch area 217 of the touch module 210 is an area where the user can perform touch operations, and the display area 227 of the display module 220 is a visible area for the user. Compared with the touch device whose sensing pad is integrated into the display module, the touch area 217 of the touch device 200 of the present invention is larger than the display area 227, which can provide the user with a more sensitive touch operation, especially when the user is on the display When performing a touch operation on the edge of the area. Since the sensing pads on the edge of the touch area 217 are incomplete, the sensing is less sensitive, but if the touch area 217 is larger than the display area 227, the touch operations performed by the user on the touch area 217 are performed by the complete pad. The sensing pad is used for sensing, so there will be no problem of insensitivity.

Please refer to FIG. 5 , which is a schematic diagram of a second embodiment of the touch device of the present invention. The touch device 500 includes a touch module 510 and a display module 520 . The display module 520 includes a first polarizer 521 , a TFT substrate 522 , a liquid crystal layer 523 , a color filter substrate 524 , a second polarizer 525 and a shielding layer 526 . The touch module 510 includes a cover substrate 511 , a plurality of sensing pads 512 and a protection layer 513 . The lower side of the upper cover substrate 511 is attached to the display module 520 through the adhesive layer 531 , a plurality of sensing pads 512 are formed on the lower side of the upper cover substrate 511 , and a protective layer 513 is formed on the plurality of sensing pads 512 . The touch module 510 has a single-layer substrate structure, that is, a plurality of sensing pads 512 are directly formed on the lower side of the upper cover substrate 511 . Since the thickness of the protection layer 513 is about several micrometers (10 ⁻⁶ m), no shielding layer can be disposed on the protection layer 513 . Therefore, in the touch device 500 of the present invention, the shielding layer 526 is disposed in the display module 520, and the ground voltage of the touch module 510 is electrically connected to the shielding layer 526, so as to block the noise generated by the display module 520 to the touch module 510. . In this embodiment, the second polarizer 525 is attached on the color filter substrate 524 , and the shielding layer 526 is disposed on the second polarizer 525 . Since the second polarizer cannot withstand the manufacturing process of indium tin oxide (ITO), the shielding layer 526 is formed by using a polyethylene terephthalate (PET) film coated with a conductive layer, and then attached to the second polarizer. Polarizer 525 on.

To sum up, the touch device of the present invention includes a single-layer touch module and a display module, and the touch module is attached to the display module through an adhesive layer. The display module includes a thin film transistor substrate, a color filter substrate, a liquid crystal layer, a first polarizer, a second polarizer and a shielding layer. The touch module includes an upper cover substrate, a plurality of sensing pads and a protective layer. The shielding layer can be disposed between the color filter substrate and the second polarizer or on the second polarizer. A plurality of sensing pads are formed on the lower side of the upper cover substrate, and the ground voltage of the plurality of sensing pads is electrically connected to the shielding layer through the flexible circuit board, so the shielding layer can block the noise generated by the display module to the touch module.

The above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the claims of the present invention shall fall within the scope of the present invention.

Claims (14)

1. A touch device, comprising: Display module, including: Thin film transistor substrate; Color filter substrate; a liquid crystal layer disposed between the thin film transistor substrate and the color filter substrate; a first polarizer attached to the thin film transistor substrate; a shielding layer disposed on the color filter substrate; and a second polarizer attached to the shielding layer; and Touch module, including: upper cover substrate; a plurality of sensing pads formed on the underside of the upper cover substrate, the plurality of sensing pads are electrically connected to the shielding layer; and The protection layer is formed on the plurality of sensing pads, the thickness of the protection layer is about several micrometers (10 ⁻⁶ m), and the lower side of the protection layer is attached to the display module through a glue layer. 2. The touch device as claimed in claim 1, wherein the shielding layer is a polyethylene terephthalate (PET) film coated with a conductive layer. 3. The touch device as claimed in claim 1, wherein the shielding layer is formed of Indium Tin Oxide (ITO). 4. The touch device as claimed in claim 3, wherein the shielding layer formed of indium tin oxide (ITO) is sputtered on the color filter substrate. 5. The touch device according to claim 1, wherein the display module comprises a display area, the touch module comprises a touch area, and the touch area is larger than the display area. 6. The touch device according to claim 1, wherein the touch module comprises a flexible circuit board, and the plurality of sensing pads are electrically connected to the shielding layer through the flexible circuit board. 7 . The touch device according to claim 6 , wherein the flexible circuit board comprises a ground voltage region, and the ground voltage of the plurality of sensing pads and the shielding layer are electrically connected to the ground voltage region. 8 . The touch device according to claim 7 , wherein the thin film transistor substrate is grounded to the ground voltage region through the flexible circuit board, so that the shielding layer is at the same ground potential as the thin film transistor substrate. 9. A touch device, comprising: Display module, including: Thin film transistor substrate; Color filter substrate; a liquid crystal layer disposed between the thin film transistor substrate and the color filter substrate; a first polarizer attached to the thin film transistor substrate; a second polarizer attached to the color filter substrate; and a shielding layer disposed on the second polarizer; and Touch module, including: upper cover substrate; a plurality of sensing pads formed on the underside of the upper cover substrate, the plurality of sensing pads are electrically connected to the shielding layer; and The protection layer is formed on the plurality of sensing pads, the thickness of the protection layer is about several micrometers (10 ⁻⁶ m), and the lower side of the protection layer is attached to the display module through a glue layer. 10. The touch device as claimed in claim 9, wherein the shielding layer is a polyethylene terephthalate (PET) film coated with a conductive layer. 11. The touch device according to claim 9, wherein the display module comprises a display area, the touch module comprises a touch area, and the touch area is larger than the display area. 12. The touch device according to claim 9, wherein the touch module comprises a flexible circuit board, and the plurality of sensing pads are electrically connected to the shielding layer through the flexible circuit board. 13 . The touch device according to claim 12 , wherein the flexible printed circuit comprises a ground voltage region, and the ground voltage of the plurality of sensing pads and the shielding layer are electrically connected to the ground voltage region. 14 . 14 . The touch device according to claim 13 , wherein the TFT substrate is grounded to the ground voltage region through the flexible circuit board, so that the shielding layer is at the same ground potential as the TFT substrate.

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