CN202142046U

CN202142046U - Built-in capacitor-type liquid crystal touch screen

Info

Publication number: CN202142046U
Application number: CN201120248740U
Authority: CN
Inventors: 吕明; 吕延; 司云聪; 陈忠国; 吉群
Original assignee: Nanjing Huadong Electronics Information and Technology Co Ltd
Current assignee: TPV Technology Co Ltd
Priority date: 2011-07-15
Filing date: 2011-07-15
Publication date: 2012-02-08
Anticipated expiration: 2021-07-15

Abstract

The utility model relates to a built-in capacitor-type liquid crystal touch screen, which comprises transparent glass substrate layers, indium tin oxide (ITO) layers, a color filter layer, a liquid crystal layer, a thin film transistor (TFT) active matrix layer, a backlight module, a polarizer layer, a planarity layer and a passivation layer. The built-in capacitor-type liquid crystal touch screen is characterized in that a capacitor-type touch control induction module is completely embedded in a liquid crystal display module, and a second ITO layer is arranged to be in the same layer with Vcom of the display module. Two introduced pixel electrodes and a corresponding induction liquid crystal capacitance coil and a corresponding storage capacitance coil respectively form an induction liquid crystal capacitor and a storage capacitor. Compared with a circuit design of a thin layer transistor in a touch control induction unit, the built-in capacitor-type liquid crystal touch screen has the advantages that circuit interference and noise caused by the fact that the touch control module is embedded in the liquid crystal display module, and the second ITO layer is arranged to be in the same layer with the Vcom of the display module are removed, one layer of ITO is reduced, the structure is simplified, light transmittance is improved, and color filters and a liquid crystal display module circuit are not needed to be modified.

Description

A kind of embedded capacitive liquid crystal touch screen

Technical field:

The utility model relates to a kind of embedded capacitive liquid crystal touch screen, belong to the LCD Technology field.

Background technology:

Touch technology has brought the human-computer interaction mode of operation of hommization more to people, becomes a kind of technology of controlling of main flow gradually.Touch screen technology is since the invention seventies in last century; Advanced 40 years of development; Touch screen technology can be broadly divided into four types by type of sensor: condenser type, resistance-type, infrared type and sound wave type; Wherein capacitive touch screen since support multi-point touch, location accurately, advantage such as long service life, occupied the present most touch-control market share.What the capacitive touch screen overwhelming majority adopted at present all is the structure of external hanging type, and the contact panel of external hanging type structure and display panel are two relatively independent devices, through direct two devices of superimposed assembling up and down.Thisly directly contact panel is fitted in the mode on the display panel; Inevitably increase the thickness and the weight of a contact panel to display; Do not meet present city field display to lightening Development Trend; The number of plies of contact panel is more simultaneously, can cause the decline of transmittance, has a strong impact on the display effect of display.

Summary of the invention

What the utility model proposed is a kind of embedded capacitive liquid crystal touch screen, and its purpose is intended to overcome the above-mentioned defective of existing in prior technology, and the capacitance touching control induction module is embedded in the LCD MODULE fully.

The technical solution of the utility model: it is characterized in that comprising the first transparent glass substrate layer, the second transparent glass substrate layer, the first indium tin oxide ITO layer, the second indium tin oxide ITO layer, color filter layers, liquid crystal layer, tft active matrix layer, module backlight, polarizer layer, complanation layer, passivation layer; Wherein, Color filter layers fits in the bottom of the first transparent glass substrate layer; The first indium tin oxide ITO layer fits in the bottom of colored filter; The pixel electrode layer and the second indium tin oxide ITO layer are on same plane, and liquid crystal layer is between the color filter layers and first pixel electrode layer, and the first pixel electrode layer bottom is followed successively by complanation layer, passivation layer, the second glass-based flaggy, tft active matrix layer, polarizer layer, module backlight; The structure that is embedded in the touch sensible device in the display module comprises some touch control sensing units, and this touch control sensing unit is positioned at by two first indium tin oxide ITO layers and two second pixel electrode matrixs that indium tin oxide ITO layer homeotropic alignment forms.

The utility model advantage: with respect to existing known technology, remove the capacitance touching control induction module is embedded in inside and outside the LCD MODULE fully, also have following technical characterstic: the two ends up and down that the first and second indium tin oxide ITO layers are arranged on liquid crystal layer; Introduce two pixel electrodes, be arranged on same one deck with the second indium tin oxide ITO layer; One passivation layer is set on second glass substrate, inductive liquid crystal capacitor line and capacitor storage beam are set in the passivation layer, form inductive liquid crystal capacitor and storage capacitors with pixel electrode respectively; And through the line design in the sensing unit, with the output voltage of touch-control module through the Vcom of pixel electrode as display module, thereby the Vcom of display module also is arranged on the second indium tin oxide ITO layer.The present invention is through being arranged on the second indium tin oxide ITO layer, pixel electrode and display module Vcom in one deck; Reduce the number of plies; Simplified structure; Improve transmittance, signal interference and the noise problem that embedded structure exists eliminated in this design simultaneously, and need not colored filter and LCD MODULE circuit etc. to be transformed again.

Description of drawings

Accompanying drawing 1 is the side structure synoptic diagram of embedded capacitive liquid crystal touch screen first embodiment.

Accompanying drawing 2 is the vertical views that touch control induction liquid crystal cells.

Accompanying drawing 3 is line construction synoptic diagram of embedded capacitive liquid crystal touch screen.

Among the figure 1 is the first transparent glass substrate layer; The 2nd, chromatic filter layer; 3 is first indium tin oxide ITO layers; The 4th, liquid crystal layer; 5 is second indium tin oxide ITO layers; 6 is first pixel electrode layers; The 7th, complanation layer; 8 is first drain electrodes; The 9th, semiconductor layer; The 10th, passivation layer; 11 is second transparent glass substrate layers; The 12nd, the source electrode of TFT3; The 13rd, semiconductor layer; 14 is second drain electrodes; The 15th, the storage capacitors electrode wires; The 16th, the data read outlet; The 17th, the source electrode of TFT2; The 18th, the tft active matrix layer; The 19th, the polarizer layer; The 20th, module backlight; The 21st, inductive liquid crystal capacitor; The 22nd, storage capacitors; 23 is second pixel electrode layers; The 24th, the inductive liquid crystal capacitor electrode wires.P is the point of contact that flows to inductive liquid crystal capacitor and storage capacitors.

Embodiment

Contrast accompanying drawing 1; The embedded capacitive liquid crystal touch screen comprises the first transparent glass substrate layer 1, the second transparent glass substrate layer 11, the first indium tin oxide ITO layer 3, the second indium tin oxide ITO layer 5, color filter layers 2, liquid crystal layer 4, tft active matrix layer 18, module backlight 20, polarizer layer 19, complanation layer 7, passivation layer 10; Wherein, Color filter layers 2 fits in the bottom of the first transparent glass substrate layer 1; The first indium tin oxide ITO layer 3 fits in the bottom of colored filter; The pixel electrode layer 6 and the second indium tin oxide ITO layer 5 be on same plane, and liquid crystal layer 4 is between the color filter layers 2 and first pixel electrode layer 6, and first pixel electrode layer, 6 bottoms are followed successively by complanation layer 7, passivation layer 10, the second glass-based flaggy 11, tft active matrix layer 18, polarizer layer 19, module backlight 20; The touch sensible device that is embedded in the display comprises some touch control sensing units, and this touch control sensing unit is positioned at the pixel electrode matrix that is formed by the first indium tin oxide ITO layer 3 and the second indium tin oxide ITO layer, 5 homeotropic alignment.

Contrast accompanying drawing 2; Touch the pixel electrode matrix that control induction liquid crystal cells is positioned at adjacent two first indium tin oxide ITO layers 3 and the 5 mutual vertical formation of two second indium tin oxide ITO layers, touch is controlled sensing unit and is comprised first thin-layer transistor, second thin-layer transistor, the 3rd thin-layer transistor, first pixel electrode, second pixel electrode, storage capacitors electrode wires, inductive liquid crystal capacitor electrode wires, data read line, column connecting line; Wherein, First thin-layer transistor, second thin-layer transistor, the 3rd thin-layer transistor are arranged in the complanation layer; Storage capacitors electrode wires and inductive liquid crystal capacitor line are positioned at passivation layer, and first pixel electrode, second pixel electrode and storage capacitors electrode wires, inductive liquid crystal capacitor electrode wires form storage capacitors and inductive liquid crystal capacitor respectively; The grid of first thin-layer transistor is connected to the first indium tin oxide ITO layer; The source electrode of first thin-layer transistor is connected to the second indium tin oxide ITO layer; The drain electrode of first thin-layer transistor is connected first electrode layer of inductive liquid crystal capacitor and storage capacitors respectively through the point of contact (P) that flows to inductive liquid crystal capacitor and storage capacitors; The storage capacitors the second electrode lay connects the data sense wire, and the inductive liquid crystal capacitor the second electrode lay connects a supply voltage; The grid of second thin-layer transistor connects the first indium tin oxide ITO layer; The source electrode of second thin-layer transistor is connected to same supply voltage; The drain electrode utmost point of second thin-layer transistor is connected to the source electrode of the 3rd thin-layer transistor, and the grid of the 3rd thin-layer transistor is connected to the data read outlet, and the drain electrode of the 3rd thin-layer transistor is connected to the second indium tin oxide ITO layer; The line of induction of different layers is connected through the column connecting line with pixel electrode, and the resistance value of column connecting line is lower than 10 ohm.

Has a touch sensing unit in each pixel electrode matrix at least.

Contrast accompanying drawing 3; The grid of the first thin-layer transistor TFT1 is connected to the first indium tin oxide ITO layer 3; The source electrode of the first thin-layer transistor TFT1 is connected to the second indium tin oxide ITO layer 5; The drain electrode of first thin-layer transistor is connected respectively to first capacitance electrode of inductive liquid crystal capacitor 21 and storage capacitors 22 through the point of contact (P) that flows to inductive liquid crystal capacitor and storage capacitors; Second capacitance electrode of inductive liquid crystal capacitor connects a supply voltage, and second capacitance electrode line of storage capacitors electrode 22 is connected to data read line 16.The inductive liquid crystal capacitor the second electrode lay connects a supply voltage; The grid of second thin-layer transistor connects the first indium tin oxide ITO layer 3; The source electrode of second thin-layer transistor is connected to a supply voltage; The drain electrode utmost point of second thin-layer transistor is connected to the source electrode of the 3rd thin-layer transistor, and the drain electrode that the grid of the 3rd thin-layer transistor is connected to data read outlet 16, the three thin-layer transistors is connected to the second indium tin oxide ITO layer 5; The line of induction of different layers is connected through the column connecting line with pixel electrode, and the resistance value of column connecting line is lower than 10 ohm.

The source electrode of the second thin-layer transistor TFT2 is connected to another output voltage; The drain electrode of the second thin-layer transistor TFT2 is connected to the source electrode of the 3rd thin-layer transistor TFT3; The grid that the drain electrode of the 3rd thin-layer transistor TFT3 is connected to the second indium tin oxide ITO layer, 5, the three thin-layer transistor TFT3 is connected to data read outlet 16.

The first indium tin oxide ITO layer, 3 control, the first thin-layer transistor TFT1 charges to inductive liquid crystal capacitor; And at a node P release reference voltage (Vp); Voltage on first electrode of inductive liquid crystal capacitor equals the voltage of node P, and second electrode of inductive liquid crystal capacitor is connected to an output voltage; The second thin-layer transistor TFT2 and the 3rd thin-layer transistor TFT3 control the conduction situation of the first thin-layer transistor TFT1 according to the variation of reference voltage Vp (change in voltage of first electrode of inductive liquid crystal capacitor just).A touch action on contact panel can change the electric capacity and the reference voltage Vp of inductive liquid crystal capacitor, and this can make the second thin-layer transistor TFT2 produce an output current and flow to the 3rd thin-layer transistor TFT3.Like this, the first indium tin oxide ITO layer, 3 control the 3rd thin-layer transistor TFT3 transfers to data read outlet 16 with output current, and then transfers to the IC unit, confirms touch coordinate by the IC unit.The Vcom that forms display module by the voltage of the voltage of inductive liquid crystal capacitor second battery lead plate output and the output of the second thin-layer transistor TFT2 source electrode through first pixel electrode 6 and second pixel electrode layer 23; Reach Vcom and the second indium tin oxide ITO layer, 5 shared one deck, and can generation signals do not disturb and the purpose of noise.

Claims

1. an embedded capacitive liquid crystal touch screen is characterized in that comprising the first transparent glass substrate layer, the second transparent glass substrate layer, the first indium tin oxide ITO layer, the second indium tin oxide ITO layer, color filter layers, liquid crystal layer, tft active matrix layer, module backlight, polarizer layer, complanation layer, passivation layer; Wherein, Color filter layers fits in the bottom of the first transparent glass substrate layer; The first indium tin oxide ITO layer fits in the bottom of colored filter; The pixel electrode layer and the second indium tin oxide ITO layer are on same plane, and liquid crystal layer is between the color filter layers and first pixel electrode layer, and the first pixel electrode layer bottom is followed successively by complanation layer, passivation layer, the second glass-based flaggy, tft active matrix layer, polarizer layer, module backlight; The structure that is embedded in the touch sensible device in the display module comprises some touch control sensing units, and this touch control sensing unit is positioned at by two first indium tin oxide ITO layers and two second pixel electrode matrixs that indium tin oxide ITO layer homeotropic alignment forms.

2. a kind of embedded capacitive liquid crystal touch screen according to claim 1 is characterized in that the touch-control sensing unit comprises first thin-layer transistor, second thin-layer transistor, the 3rd thin-layer transistor, first pixel electrode, second pixel electrode, storage capacitors electrode wires, inductive liquid crystal capacitor electrode wires, data read line, column connecting line; Wherein, First thin-layer transistor, second thin-layer transistor, the 3rd thin-layer transistor are arranged in the complanation layer; Storage capacitors electrode wires and inductive liquid crystal capacitor line are positioned at passivation layer, and first pixel electrode, second pixel electrode and storage capacitors electrode wires, inductive liquid crystal capacitor electrode wires form storage capacitors and inductive liquid crystal capacitor respectively; The grid of first thin-layer transistor is connected to the first indium tin oxide ITO layer; The source electrode of first thin-layer transistor is connected to the second indium tin oxide ITO layer; The drain electrode of first thin-layer transistor is connected first electrode layer of inductive liquid crystal capacitor and storage capacitors respectively through the point of contact (P) that flows to inductive liquid crystal capacitor and storage capacitors; The storage capacitors the second electrode lay connects the data sense wire, and the inductive liquid crystal capacitor the second electrode lay connects a supply voltage; The grid of second thin-layer transistor connects the first indium tin oxide ITO layer; The source electrode of second thin-layer transistor is connected to same supply voltage; The drain electrode utmost point of second thin-layer transistor is connected to the source electrode of the 3rd thin-layer transistor, and the grid of the 3rd thin-layer transistor is connected to the data read outlet, and the drain electrode of the 3rd thin-layer transistor is connected to the second indium tin oxide ITO layer; The line of induction of different layers and pixel electrode join through the column connecting line, and the resistance value of column connecting line is lower than 10 ohm.

3. a kind of embedded capacitive liquid crystal touch screen according to claim 1 is characterized in that having a touch sensing unit in each pixel electrode matrix at least.