TWI650594B - Touch display panel structure - Google Patents

Abstract

The invention provides a touch display panel structure. A thin film transistor substrate is divided into a display work area and a non-display work area, and there are a plurality of gate scan lines and a plurality of source data lines on the display work area. A plurality of touch sensing electrodes are formed on the thin film transistor substrate. The thin film transistor substrate and a color filter substrate are arranged in parallel to sandwich a liquid crystal layer. A first polarizing layer is located on the surface of the thin film transistor substrate opposite to the liquid crystal layer. A backlight module is located on a surface of the first polarizing layer opposite to a surface of the liquid crystal layer. A conductive layer is located on the surface of the backlight module opposite to the liquid crystal layer.

Description

Touch display panel structure

The present invention relates to the technical field of display panels, and more particularly to a touch display panel structure.

With the development of the electronics industry, portable electronic products have gradually been flooded into life, such as mobile phones, personal digital assistants (PDAs), MP3 players, and so on. These portable electronic products usually have a small display screen, and the panel may be a liquid crystal display (LCD), an organic light-emitting flat display (OLED), a lateral electric field effect display panel (In panel switching, IPS), or other common Flat display. IPS display panel has the advantages of large viewing angle and accurate color reproduction. At the same time, the surface of IPS display panel is hard and does not change the color difference due to pressure, so it has become the first choice for advanced touch screens. For example, Apple's iPhone and iPad use IPS display panels, so most smart phones also use IPS display panels.

The LCD of the IPS display panel is a flat-rotation type. The IPS display panel uses a plurality of thin film transistors on a thin film transistor substrate (TFT substrate) as a switch, so that the liquid crystal of the IPS display panel is rotated horizontally, and the bottom of the thin film transistor substrate (TFT substrate) is rotated. The light of the backlight module passes through the liquid crystal of the IPS display panel. In the conventional technology, a support layer is provided below the backlight module, so that the backlight module, a thin film transistor substrate (TFT substrate), a liquid crystal layer, and a color filter substrate (CF substrate) and so on. The IPS display panel can also be combined with a plurality of touch sensing electrodes to form a touch display panel. However, the noise generated by the display panel will affect the sensitivity of touch sensing. Therefore, the conventional touch display panel structure still has room for improvement.

The purpose of the present invention is mainly to provide a touch display panel structure, which can reduce a metal supporting layer, thereby reducing the system cost. At the same time, the ground of the flexible printed circuit board can be electrically connected to the fixed support layer of the system, thereby reducing noise on the flexible printed circuit board.

According to a feature of the present invention, the present invention provides a touch display panel structure including a thin film transistor substrate, a plurality of touch sensing electrodes, a color filter substrate, a first polarizing layer, a backlight module, and a conductive material. Floor. The thin film transistor substrate is divided into a display work area and a non-display work area, and the display work area has a plurality of gate scan lines and a plurality of source data lines. The plurality of touch sensing electrodes are formed on the thin film transistor substrate. The color filter substrate is disposed in parallel with the thin film transistor substrate to sandwich a liquid crystal layer between the two substrates. The first polarizing layer is located on a surface of the thin film transistor substrate opposite to the liquid crystal layer. The backlight module is located on a surface of the first polarizing layer opposite to a surface of the liquid crystal layer. The conductive layer is located on a surface of the backlight module opposite to the liquid crystal layer.

100‧‧‧Touch display panel structure

110‧‧‧ thin film transistor substrate

120‧‧‧color filter substrate

130‧‧‧LCD layer

140‧‧‧first polarizing layer

150‧‧‧ backlight module

160‧‧‧ conductive layer

170‧‧‧System fixed support layer

180‧‧‧ masking layer

190‧‧‧Second polarizing layer

200‧‧‧ flexible printed circuit board

210‧‧‧Conductive silver glue

111‧‧‧touch sensing electrode

121‧‧‧Red color filter

123‧‧‧blue color filter

125‧‧‧ green color filter

127‧‧‧ Black Matrix

161‧‧‧ conductive adhesive layer

117‧‧‧ ground connection pad

119‧‧‧ Ground

203‧‧‧controller

113‧‧‧Gate scan line

115‧‧‧Source data line

250‧‧‧Display work area

260‧‧‧ Non-display work area

211‧‧‧route

FIG. 1 is a stacked schematic diagram of a touch display panel structure according to the present invention.

FIG. 2 is a schematic plan view of a thin film transistor substrate and a flexible printed circuit board of the present invention.

FIG. 3 is a stacked schematic diagram of another embodiment of a touch display panel structure according to the present invention.

FIG. 1 is a stacking diagram of a touch display panel structure 100 according to the present invention. The touch display panel structure 100 includes a thin film transistor substrate (TFT substrate) 110, a color filter substrate (CF substrate) 120, a liquid crystal layer 130, a first polarizing layer 140, a backlight module 150, and a conductive material. The layer 160, a shielding layer 180, a second polarizing layer 190, a flexible printed circuit board (FPC) 200, and a conductive silver paste 210.

Referring also to the schematic plan view of the thin film transistor substrate 110 and the flexible printed circuit board 200 of the present invention shown in FIG. 2, the thin film transistor substrate 110 is divided into a display working area 250 and a non-display working area 260. The display working area 250 includes a plurality of thin film transistors (not shown), a plurality of gate scanning lines 113, and a plurality of source data lines 115. A thin film transistor is located at the junction of the gate scanning line 113 and the source data line 115. Wherein, the arrangement of the plurality of gate scanning lines 113 and the plurality of source data lines 115 is known to a general flat panel display, so their functions are not described here. . As shown in FIG. 2, the portion other than the display work area 250 on the thin film transistor substrate 110 is the non-display work area 260. In one embodiment, a plurality of touch sensing electrodes 111 are disposed on the thin film transistor substrate 110. As shown in FIG. 2, the plurality of touch sensing electrodes 111 may be disposed in the display work area 250 or the non-display work area 260.

Please refer to FIG. 1 again. The color filter substrate 120 and the thin film transistor substrate 110 are arranged in parallel in a pair to sandwich a liquid crystal layer 130 between the two substrates 120 and 110. A plurality of red color filters 121, blue color filters 123, green color filters 125, and black matrix 127 are disposed on a side of the color filter substrate 120 facing the liquid crystal layer 130.

The first polarizing layer 140 is located on a surface of the thin film transistor substrate 110 opposite to the liquid crystal layer 130. The backlight module 150 is located on a surface of the first polarizing layer 140 opposite to the liquid crystal layer 130. It can be understood that the backlight module 150 may be composed of components such as a light guide plate, a diffusion sheet, and a light source. In the illustration, to avoid excessively complex tables, only a single layer is used.

The conductive layer 160 is located on a surface of the backlight module 150 opposite to the liquid crystal layer 130. In one embodiment, the conductive layer 160 may be a conductive copper foil or a conductive cloth, or may be other suitable conductive materials. In one embodiment, the thickness of the conductive copper foil may be less than 0.1 millimeter (mm), and the thickness of the conductive cloth may be less than 0.15 millimeter (mm).

The shielding layer 180 is located on a surface of the color filter substrate 120 opposite to the liquid crystal layer 130. The second polarizing layer 190 is located on a surface of the shielding layer 180 opposite to the liquid crystal layer 130. The shielding layer is a transparent conductive material. The transparent conductive material is selected from one of the following groups: indium tin oxide (ITO), indium zinc oxide, zinc tin oxide, a conductive polymer, and a carbon nanotube.

The shielding layer is electrically connected to a ground connection pad 117 of the thin film transistor substrate 110 by a conductive silver glue 210 via 180.

Please refer to FIG. 2 again, the flexible printed circuit board 200 further includes a plurality of grounds 119 and a control circuit 203. The ground connection pad 117 is electrically connected to two of the grounds 119 through a wiring 211, and is further connected to a ground (not shown) of the controller 203 on the flexible printed circuit board 200. The controller 203 can be used as a display controller to provide display-related data and control signals to the thin-film transistor substrate 110 to perform a display operation. The controller 203 has a ground signal and is connected to the ground on the flexible printed circuit board 200. The ground connection pad 117 directly extends to the edge of the thin-film transistor substrate 110 and contacts the conductive layer 160, so that the ground connection pad 117 and the conductive layer 160 are connected to the ground 119, and then electrically connected to the ground signal of the controller 203.

In other embodiments, the controller 203 of the flexible printed circuit board 200 may be replaced by a touch sensor to provide and receive touch control signals and related data to the thin-film transistor substrate 110 to perform Touch detection. In yet another embodiment, the controller 203 may be a display and touch sensor. The display and touch sensor can provide display related data and control signals to the thin film transistor substrate 110 for display operation, and can also provide and receive touch control signals and related data to the thin film transistor substrate. 110 for touch detection.

FIG. 3 is a stacked schematic diagram of another embodiment of a touch display panel structure 100 according to the present invention. The main difference from FIG. 1 is that the conductive layer 160 is further connected to a ground 119 of the flexible printed circuit board 200, so that the ground of the flexible printed circuit board 200 can be electrically connected to the system fixed support layer 170. At the same time, the touch display panel structure 100 further has a system fixed support layer 170. The system fixed support layer 170 is located on a surface of the conductive layer 160 opposite to the liquid crystal layer 130. A conductive adhesive layer 161 is provided between the conductive layer 160 and the system fixed support layer 170 to adhere and electrically connect the conductive layer 160 and the system fixed support layer 170.

As can be seen from the foregoing description, compared with the conventional technology, the present invention can reduce the support layer of a metal to reduce the system cost. That is, the present invention is to form the conductive layer 160 instead of the original support layer, which can not only achieve the shielding effect, but also make the panel and the handheld device thinner and lighter. At the same time, the ground of the flexible printed circuit board 200 can be electrically connected to the system fixed support layer 170, thereby reducing noise on the flexible printed circuit board 200.

The above embodiments are merely examples for the convenience of description. The scope of the claimed rights of the present invention should be based on the scope of the patent application, rather than being limited to the above embodiments.

Claims (9)

A touch display panel structure includes a thin film transistor substrate divided into a display work area and a non-display work area, and the display work area has a plurality of gate scanning lines and a plurality of source data. Lines; a plurality of touch sensing electrodes formed on the thin film transistor substrate; a color filter substrate disposed parallel to the thin film transistor substrate to sandwich a liquid crystal layer between the two substrates; a first A polarizing layer is located on the surface of the thin-film transistor substrate facing the other side of the liquid crystal layer; a backlight module is located on the surface of the first polarizing layer facing the other side of the liquid crystal layer; a conductive layer is located on The surface of the backlight module is opposite to the surface of the liquid crystal layer; and a system fixed support layer is located between the surface of the conductive layer and the other surface of the liquid crystal layer between the conductive layer and the system fixed support layer A conductive adhesive layer is used to adhere and electrically connect the conductive layer to the system's fixed support layer. The conductive layer is electrically connected to a ground signal of a controller. The touch display panel structure according to item 1 of the patent application scope, wherein the conductive layer includes a conductive copper foil or a conductive cloth. According to the touch display panel structure described in item 2 of the patent application scope, wherein the thickness of the conductive copper foil is less than 0.1 millimeter (mm). The touch display panel structure according to item 2 of the scope of the patent application, wherein the thickness of the conductive cloth is less than 0.15 millimeters (mm). The touch display panel structure according to item 2 of the scope of patent application, further comprising: a shielding layer on a surface of the color filter substrate opposite to the liquid crystal layer; and a second polarizing layer on The surface of the shielding layer is opposite to the surface of the other side of the liquid crystal layer. The touch display panel structure according to item 5 of the application, wherein the shielding layer is a transparent conductive material and is electrically connected to a ground connection pad of the thin film transistor substrate through a conductive silver glue. The touch display panel structure according to item 6 of the patent application scope, wherein the transparent conductive material is selected from the group consisting of indium tin oxide, indium zinc oxide, zinc tin oxide, a conductive polymer, and a carbon nanotube. One of the materials. The touch display panel structure according to item 7 of the patent application scope, further comprising: a flexible printed circuit board connected to the thin film transistor substrate, and at least one ground signal of the flexible printed circuit board and the thin film transistor This ground connection pad of the substrate is electrically connected. The touch display panel structure according to item 8 of the patent application scope, wherein the conductive layer is extended to be electrically connected to at least one ground signal of the flexible printed circuit board.