CN102455812B - Touch display device - Google Patents

Touch display device Download PDF

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Publication number
CN102455812B
CN102455812B CN201010526964.1A CN201010526964A CN102455812B CN 102455812 B CN102455812 B CN 102455812B CN 201010526964 A CN201010526964 A CN 201010526964A CN 102455812 B CN102455812 B CN 102455812B
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signal
display device
circuit
touching display
frequency
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CN102455812A (en
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吴鸿伟
李明宪
陈灿辉
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Silicon Integrated Systems Corp
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Silicon Integrated Systems Corp
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Abstract

The invention discloses a touch display device which comprises an array substrate, an opposite substrate, a common electrode, a display material, a gate drive circuit, a source drive circuit, at least one sensing circuit and a controller used for controlling the source drive circuit, the gate drive circuit and the at least one sensing circuit. By use of an active matrix drive structure or an original passive matrix drive structure which is upside down, based on the characteristics of a human body conductor and the design of the anti-noise sensing circuit, the effect of performing displaying and multi-point touch sensing at the same time is realized, thereby reducing hardware cost and saving energy.

Description

The touching display device
Technical field
The present invention is relevant for the touching display device, especially about a kind of touching display device shown with the multi-point touch function of integrating.
Background technology
The cross-sectional view that Figure 1A is conventional thin film transistor liquid crystal panel (thin film transistor LCD).Figure 1B is one of Figure 1A partial structurtes enlarged perspectives, the circuit diagram of display layer, controller, source electrode drive circuit and gate driver circuit.One of the pel array that Fig. 1 C is Figure 1B partial circuit diagram.TFT LCD system in Figure 1A～Fig. 1 C adopts active-matrix (Active Matrix) type of drive to carry out array of display pixels.
With reference to Figure 1A, polaroid (polarizer) 173 is located at relative substrate (substrate) 170 tops, in order to detect the polarization direction of this incident polarized light after liquid crystal rotates through, is called again and examines the sheet that shakes.Polaroid 183 is located at array base palte 180 belows, in order to change the polarization direction of incident light, is called again the starting of oscillation sheet.The colored filter (color filter, CF) 171 that relatively element on substrate 170 comprises three kinds of colors, mean respectively the RGB three primary colors of each pixel; In addition, whole piece ITO transparent conductor film more is set on colored filter 171, as the public electrode (common electrode) 172 of liquid crystal capacitance 116.(backlight) backlight module 160 is for producing the intensity of light with the compensate for ambient light source.
Array base palte 180 tops arrange a signals layer 181, comprise crisscross data line D1～D3 and sweep trace G1～G3, form a pel array.Controller 130 is in order to control source electrode drive circuit 110 (source driver) and gate driver circuit 120 (gate driver), makes it see through data line D1～D3 and sweep trace G1～G3 (only take in Figure 1B three data lines and three sweep traces explain for example) and deposits the show image value in each pixel cell in a pel array.Wherein, near the point of crossing of each data line and sweep trace, (being each pixel cell) all arranges a thin film transistor (TFT) 115, a liquid crystal capacitance (capacitor) 116 and a storage capacitors 117.The grid of thin film transistor (TFT) 115 is connected to sweep trace G1, and source electrode is connected to data line D1, and drain is connected to the pixel electrode 116a of liquid crystal capacitance 116.Liquid crystal capacitance 116 is comprised of pixel electrode 116a, public electrode (common electrode, Vcom) 172 and liquid crystal layer 150.Thin film transistor (TFT) 115 is equivalent to the function of switch, demonstration voltage (display voltage) can be stored among liquid crystal capacitance 116, and liquid crystal capacitance 116 opposite sides is received the reference potential of public electrode 172 as stored magnitude of voltage.The stored demonstration magnitude of voltage of liquid crystal capacitance 116 can rotate the orientation of liquid crystal, and then changes the polarization direction of incident light, and upper and lower two polaroids 173,183 of arranging in pairs or groups can determine that this puts shown brightness value.The function of storage capacitors 117 is that auxiliary liquid crystal capacitance 116 stores electric charge.
Traditional touching display device is at the additional touching device of display device, but the shortcoming that can cause display brightness to descend also can increase hardware cost simultaneously.
Summary of the invention
One of purpose of the present invention is to propose a kind of active matrix touching display device, utilize the active matrix drive structure of turned upside down, coordinate characteristic and the design of antimierophonic sensing circuit of human body conductor, reach the effect of while processes and displays and multi-point touch sensing.
For reaching above-mentioned purpose, active matrix touching display device of the present invention, comprise: array basal plate, on its surface away from the user, be provided with a signals layer, comprise many data lines and multi-strip scanning line, wherein each confluce of those data lines and those sweep traces configures respectively a pixel cell, and each pixel cell is provided with a switching element and a pixel electrode; One relative substrate, parallel with respect to this array base palte and be positioned at the side away from one of user; One public electrode, with respect to those pixel electrodes, be located on close user's the surface of this relative substrate; One display material, be sandwiched between this array base palte and this relative substrate; One gate driver circuit, sequentially the activation pixel cell that respectively this sweep trace connected, wherein, form a plurality of the first tie points between the output terminal of this gate driver circuit and those data lines; The one source pole driving circuit, provide a plurality of data-signals, and export corresponding pixel cell to via those data lines, wherein, forms a plurality of the second tie points between the output terminal of this source electrode drive circuit and those data lines; At least one sensing circuit, carry out touch sensing in order at least one to those data lines and those sweep traces, each sensing circuit comprises: a detection circuit, according at least one frequency, produces a detectable signal to export at least one of those first tie points and those the second tie points to; And a sensor circuit, receive at least one output signal of corresponding tie point, carries out the signal acquisition processing, to produce a measuring value; And a controller, in order to control this source electrode drive circuit, this gate driver circuit and this at least one sensing circuit.
Another purpose of the present invention is to provide a kind of passive matrix type touching display device, comprises: a first substrate, and its surface away from the user is upper, is provided with a first signal layer, comprises many first signal lines; One second substrate, parallel with respect to this first substrate and be located at the side away from one of user, go up on the surface near the user of this second substrate, is provided with a secondary signal layer, comprise many secondary signal lines, wherein interlaced arrangement between those first signal lines and those secondary signals; One display material, be sandwiched between this first substrate and this second substrate; One first driving circuit, in order to supply at least one the first voltage signal to those first signal lines, wherein, form a plurality of the first tie points between the output terminal of this first driving circuit and those first signal lines; One second driving circuit, in order to supply at least one second voltage signal to those secondary signal lines, wherein, the output terminal of this second driving circuit and those secondary signal lines form a plurality of the second tie points; At least one sensing circuit, carry out touch sensing in order at least one to those first signal lines and those secondary signal lines, each sensing circuit comprises: a detection circuit, according at least one frequency, produce a detectable signal to export at least one of those first tie points and those the second tie points to; And a sensor circuit, receive at least one output signal of corresponding tie point, carries out the signal acquisition processing, to produce a measuring value; And a controller, in order to control this first driving circuit, this second driving circuit and this at least one sensing circuit.
Other purposes of the present invention and advantage can be further understood from the disclosed technical characterictic of the present invention.For the present invention's above and other purpose, feature and advantage can be become apparent, special embodiment below also coordinates appended graphicly, is described in detail below.
The accompanying drawing explanation
The cross-sectional view that Figure 1A is the conventional thin film transistor liquid crystal panel;
The partial structurtes enlarged perspective that Figure 1B is Figure 1A, the circuit diagram of display layer, controller, source electrode drive circuit and gate driver circuit;
One partial circuit diagram of the pel array that Fig. 1 C is Figure 1B;
The cross-sectional view of the embodiment that Fig. 2 A is active matrix touching display device of the present invention;
The partial structurtes enlarged perspective that Fig. 2 B is Fig. 2 A, the circuit diagram of display layer, controller, source drive and sensing circuit and grid driving and sensing circuit;
Fig. 2 C shows the cross-sectional view of another embodiment of active matrix touching display device, and wherein, colored filter system is arranged between public electrode and relative substrate;
Fig. 2 D shows the cross-sectional view of another embodiment of active matrix touching display device, and wherein, colored filter system is located on signals layer;
The cross-sectional view of another embodiment that Fig. 3 A is active matrix touching display device of the present invention;
The partial structurtes enlarged perspective that Fig. 3 B is Fig. 3 A, the circuit diagram of display layer, controller, source drive and sensing circuit and grid driving and sensing circuit;
Fig. 3 C shows the cross-sectional view of another embodiment of active matrix touching display device, and wherein, colored filter system is located on the signals layer of array base palte;
The cross-sectional view of the embodiment that Fig. 4 A is passive matrix type touching display device of the present invention;
The partial structurtes enlarged perspective that Fig. 4 B is Fig. 4 A, the circuit diagram of display layer, controller, the first driving and sensing circuit and the second driving and sensing circuit;
Fig. 4 C shows the cross-sectional view of another embodiment of passive matrix type touching display device, and wherein, colored filter system is arranged on the secondary signal layer;
Fig. 4 D shows the cross-sectional view of another embodiment of passive matrix type touching display device, and wherein, colored filter system is arranged on the first signal layer;
The cross-sectional view of the embodiment that Fig. 5 A is passive matrix type touching display device of the present invention;
The partial structurtes enlarged perspective that Fig. 5 B is Fig. 5 A, the circuit diagram of display layer, controller, the first driving and sensing circuit and the second driving and sensing circuit;
Fig. 5 C shows the cross-sectional view of another embodiment of passive matrix type touching display device, and wherein, colored filter system is located on the first signal layer of array base palte;
Fig. 6 A shows that grid of the present invention drives and the circuit framework figure of an embodiment of sensing circuit;
Fig. 6 B shows the framework circuit diagram of an embodiment of source drive of the present invention and sensing circuit;
Fig. 6 C is the embodiment according to Fig. 6 A, when three sweep traces are formed to an induction channels, and the rough schematic of circuit;
Fig. 7 A shows the circuit framework figure of the first embodiment of sensing circuit of the present invention;
Fig. 7 B shows the circuit framework figure of the second embodiment of sensing circuit of the present invention;
Fig. 7 C shows the circuit framework figure of the 3rd embodiment of sensing circuit of the present invention;
Fig. 7 D shows the circuit framework figure of the 4th embodiment of sensing circuit of the present invention;
Fig. 7 E shows the circuit framework figure of the 5th embodiment of sensing circuit of the present invention;
Fig. 7 F shows the circuit framework figure of the 6th embodiment of sensing circuit of the present invention;
Fig. 7 G shows the circuit framework figure of the 7th embodiment of sensing circuit of the present invention;
Fig. 7 H shows the circuit framework figure of the 8th embodiment of sensing circuit of the present invention;
When Fig. 8 display acquisition device carries out the signal acquisition processing, the schematic diagram that the positive negative term of noise meeting of different frequency disappears mutually;
Fig. 9 A is the embodiment according to Fig. 7 E, in the situation that finger is touched the present invention, does not touch display device, the rough schematic of circuit;
Fig. 9 B is the embodiment according to Fig. 7 E, when two sweep traces of two input ends that connect differential amplifier are sensed finger touches simultaneously, and the rough schematic of circuit;
Fig. 9 C is the embodiment according to Fig. 7 E, when only having a sweep trace to sense finger touches, and the rough schematic of circuit;
Figure 10 A to Figure 10 C is that sensing circuit of the present invention is pointed three kinds of different modes of sensing to sweep trace.
The main element symbol description:
110 source electrode drive circuits
115 thin film transistor (TFT)s
116 liquid crystal capacitances
The 116a pixel electrode
117 storage capacitors
120 gate driver circuits
130 controllers
150 liquid crystal layers
160 backlight modules
170,270 relative substrates
171 colored filters
172 public electrodes
173,183 polaroids
180,280 array base paltes
181 signals layers
200,200 ', 200 " active matrix touching display device
210 source drive and sensing circuit
220 grids drive and sensing circuit
215,215 ', 710,720,730 sensing circuits
740,750,760,770,780 sensing circuits
250 display materials
300,300 ' active matrix touching display device
400,400 ', 400 " passive matrix type touching display device
410 first drive and sensing circuit
420 second drive and sensing circuit
415 first driving circuits
425 second driving circuits
470 secondary signal layers
480 first signal layers
500,500 ' passive matrix type touching display device
610,610 ' detection circuit
620,620A, 620B, 620C, 620D sensor circuit
620E, 620F, 620G, 620H sensor circuit
630 multiplexers
651 output buffers
711 waveform generators
712,712 ' voltage driver
713 impact dampers
714 signal acquisition devices
715 digital analogue converters
731 bandpass filter
732 r.m.s. circuit
733 digital analogue converters/impact damper
742 differential amplifiers
D1～Di data line
G1～Gn sweep trace
S1a～S1c first signal line
S2a～S2c secondary signal line
C fcoupling capacitance
C b, R bthe human body equivalent electrical circuit
First substrate 280a
Second substrate 270a
Embodiment
The following description will be enumerated several preferably example embodiment of the present invention, for example: various electronic circuits, element and associated method.Those skilled in the art should understand, and the present invention can adopt various possible modes to implement, and is not limited to the embodiment of following demonstration or the feature in embodiment.In addition, many details of being known no longer repeat show or repeat, to avoid fuzzy the present invention's emphasis.
The cross-sectional view that Fig. 2 A is one of active-matrix of the present invention (Active Matrix) touching display device embodiment.Fig. 2 B is one of Fig. 2 A partial structurtes enlarged perspectives, the circuit diagram of display layer, controller, source drive and sensing circuit and grid driving and sensing circuit.With reference to figure 2A and Fig. 2 B, the structure of active matrix of the present invention touching display device 200 from user's direction from top to bottom, mainly is divided into: array base palte 280, display material 250 and relative substrate 270.Substrate 270 tops arrange a public electrode 172 relatively, and array base palte 280 belows (on the surface away from the user) arranges a signals layer 181, comprise crisscross data line D1～D3 and sweep trace G1～G3 (only take three data lines and three sweep traces at this explains as example), form a pel array.Wherein, near the point of crossing of each data line and sweep trace, each confluce configures respectively a pixel cell, and each pixel cell is provided with a thin film transistor (TFT) 115 and a pixel electrode 116a (as shown in Figure 1 C).In this manual, the element of same numeral has identical function, structure or material, at this not in repeating.According to the present invention, the material of array base palte 280 and relative substrate 270 can be the one of plastic cement, glass and thin metal.
In the traditional structure of Figure 1A, between the signals layer 181 of array base palte 180 and user finger, due to every one deck conductor, public electrode 172, make data line and sweep trace can't sense the touching of finger.After the present invention exchanges up and down by the position by relative substrate and array base palte, as shown in Figure 2 A, the array base palte 280 that comprises data line and sweep trace is positioned at top (approaching one of user side), the relative substrate 270 at public electrode 172 places is positioned at below (away from one of user side), not only make signals layer 181 more approach user's finger, and public electrode 172 is no longer between signals layer 181 and user's finger.Therefore, the present invention just can utilize data line D1～D3 and the interlaced matrix driving structure of sweep trace G1～G3, and the mode that sees through detecting people body leakage current has been carried out the touching of correct finger sensing.It is noted that, the present invention does not need to change original processing procedure of relative substrate 270 and array base palte 280, only need be by the turned upside down of relative substrate 270 and array base palte 280 when encapsulation, and pour into betwixt or sandwich one deck display material 250 and get final product, simultaneously, the relative substrate 270 of turned upside down can't affect display quality with array base palte 280.
With reference to figure 2B, controller 130 drives and sensing circuit 220 in order to control source drive and sensing circuit 210 and grid, and source drive and sensing circuit 210 are connected to data line D1～D3, and grid drives and sensing circuit 220 is connected to sweep trace G1～G3.Grid drives and sensing circuit 220 comprises a gate driver circuit 120 and a sensing circuit 215, and source drive and sensing circuit 210 comprise one source pole driving circuit 110 and a sensing circuit 215 '.During practical application, usually source electrode drive circuit 110 and sensing circuit 215 ' are integrated into to same chip 210, and gate driver circuit 120 and sensing circuit 215 are integrated into to another chip 220.And controller 130, chip 210,220 can be located at array base palte 280 or relatively on substrate 270, or be located at outside array base palte 280, for example, on the framework of display.Source electrode drive circuit 110 and gate driver circuit 120 are for driving the image display of this pel array, and sensing circuit 215 ' is connected to the output terminal of output buffer 651 of source electrode drive circuit 110 and the tie point (as shown in Figure 6B) of each data line, to carry out the touch sensing of data line.Sensing circuit 215 is connected to the output terminal of output buffer 651 of gate driver circuit 120 and the tie point (as shown in Figure 6A) of each sweep trace, to carry out the touch sensing of sweep trace.In this instructions, sensing circuit 215,215 ' circuit are identical, only by different labels, mean the diverse location at place.As for sensing circuit 215,215 ' detailed function mode, will be described at Fig. 6 A to Fig. 6 C and Fig. 7 A to Fig. 7 H.
Display material 250 comprises microcapsules (microcapsules) and photoelectricity exciting light (electro luminescence) element etc., but the present invention's application is as limit, existing or other display materials of developing out in the future are also applicable to the present invention's concept.In one embodiment, this display material 250 is to utilize microcapsules to implement, and active matrix touching display device 200 realizes a touching display device that shows (electrophoretic display, EPD) function in conjunction with touching and microcapsules electric ink.In another embodiment, this display material 250 is to utilize EL part to implement, but electro-exciting light-emitting display active illuminating, to reach the function that strengthens luminance brightness and power saving, and active matrix touching display device 200 realizes that a touching display device in conjunction with touching and electroluminescence Presentation Function, prerequisite are that this EL part can send the trichromatic light of RGB or 200 of active matrix touching display device need monochromatic the demonstration.This is because microcapsules itself can send voluntarily the trichromatic light of RGB or touch 200 of display device and need monochromaticly show with color or EL part, therefore in the structure of active matrix touching display device 200, colored filter need not be set.EL part comprises light emitting diode (LED), Organic Light Emitting Diode (OLED) and polymer LED (PLED) etc., but the present invention's application is as limit, existing or other EL parts of developing out in the future are also applicable to the present invention's concept.
On the other hand, when EL part can't send the trichromatic light of RGB and the colored demonstration of touching display device needs, need separately to arrange a colored filter 171 in the structure of touching display device, for example: the colored filter 171 of active matrix touching display device 200 ' is to be arranged between public electrode 172 and relative substrate 270 (as shown in Figure 2 C), and active matrix touching display device 200 " colored filter 171 be to be arranged on signals layer 181 (as shown in Figure 2 D).
The cross-sectional view of another embodiment that Fig. 3 A is active matrix touching display device of the present invention.Fig. 3 B is one of Fig. 3 A partial structurtes enlarged perspectives, the circuit diagram of display layer, controller, source drive and sensing circuit and grid driving and sensing circuit.With reference to figure 3A, the structure of active matrix of the present invention touching display device 300 from user's direction from top to bottom, mainly is divided into: array base palte 280, liquid crystal layer 150, substrate 270 and backlight module 160 relatively.According to the present invention, the material of array base palte 280 and relative substrate 270 can be the one of plastic cement, glass and thin metal.
The below of array base palte 280 (on the surface away from the user) arranges a signals layer 181, and the top of array base palte 280 (near on user's surface) arranges a polaroid 183.Form a reflection on polaroid 183 and prevent (AR) film, and more form a cloudy surface anti-dazzle (AG) film (not shown) on antireflection film.Antireflection film is in order to prevent light reflection, and the cloudy surface antiglare film, in order to prevent dazzle, certainly, is considered based on cost, can plated film or only plate antireflection film and the one of cloudy surface antiglare film.Substrate 270 tops (near on user's surface) arrange a colored filter 171 relatively, and a public electrode 172 more is set on colored filter 171.In addition, substrate 270 belows (on the surface away from the user) arrange a polaroid 173 relatively.Backlight module 160 is the bottom that is positioned at active matrix touching display device 300.Due to data line D1～D3, sweep trace G1～G3, controller 130, source drive and sensing circuit 210 in Fig. 3 B and grid drive and circuit framework and Fig. 2 B of sensing circuit 220 identical, at this not in repeating.
In another embodiment, colored filter 171 is to be located on the signals layer 181 of array base palte 280, as shown in Figure 3 C.Certainly, if when 300 of active matrix touching display device need monochromatic the demonstration, just without colored filter 171 is set.
Above-mentioned all embodiment all belong to active matrix configuration, and active matrix configuration system utilizes TFT that demonstrations voltage is stored among liquid crystal capacitance 116, and this electric capacity 116 can be used for continuing to maintain the magnitude of voltage of ' making the liquid crystal rotation '.Relatively, passive-matrix (passive matrix) structure does not arrange TFT and public electrode, but directly power up, be pressed on x direction electrode and y direction electrode, the color of each point of crossing (being each pixel) is changed, using as showing, therefore make simply, with low cost, generally be applied to distortion orientation (twisted nematic, TN) among LCD, supertwist orientation (supertwisted nematic, STN) LCD.Because the passive-matrix structure does not just arrange public electrode originally, the present invention can directly utilize the passive-matrix structure of data line and sweep trace, and sees through the touching of the next correct finger sensing of mode of detecting people body leakage current.
The cross-sectional view that Fig. 4 A is one of passive matrix type of the present invention (Passive Matrix) touching display device embodiment.Fig. 4 B is one of Fig. 4 A partial structurtes enlarged perspectives, the circuit diagram of display layer, controller, the first driving and sensing circuit and the second driving and sensing circuit.
With reference to figure 4A, the structure of passive matrix type of the present invention touching display device 400 from user's direction from top to bottom, mainly is divided into: first substrate 280a, display material 250 and second substrate 270a.First substrate 280a below (on the surface away from the user) arranges a first signal layer 480, comprises many almost parallel first signal lines.Second substrate 270a top (approaching on user's surface) arranges a secondary signal layer 470, comprises many almost parallel secondary signal lines, and, those first signal lines and the spatially interlaced arrangement of those secondary signal lines.As mentioned above, the passive-matrix structure does not arrange public electrode, therefore no matter between first signal layer 480 or secondary signal layer 470 and user's finger, can't be isolated by any conductor, even secondary signal layer 470 and user's distance is slightly far away, still can utilize the interlaced matrix driving structure of first signal line and secondary signal line and see through the mode of detecting people's body leakage current, the touching of correct finger sensing.
Display material 250 comprises microcapsules (microcapsules) and photoelectricity exciting light (electro luminescence) element etc., but the present invention's application is as limit, existing or other display materials of developing out in the future are also applicable to the present invention's concept.In one embodiment, this display material 250 is to utilize microcapsules to implement, and passive matrix type touching display device 400 realizes a touching display device in conjunction with touching and microcapsules electric ink Presentation Function.In another embodiment, this display material 250 is to utilize EL part to implement, but electro-exciting light-emitting display active illuminating, to reach the function that strengthens luminance brightness and power saving, and passive matrix type touching display device 400 realizes that a touching display device in conjunction with touching and electroluminescence Presentation Function, prerequisite are that this EL part can send the trichromatic light of RGB or 400 of touching display device need monochromatic the demonstration.This is because microcapsules itself can send voluntarily the trichromatic light of RGB or touch 400 of display device and need monochromaticly show with color or EL part, therefore in the structure of passive matrix type touching display device 400, colored filter need not be set.
On the other hand, when EL part can can't send the trichromatic light of RGB and touching display device while needing colored the demonstration, need separately to arrange a colored filter 171 in the structure of touching display device, for example: the colored filter 171 of passive matrix type touching display device 400 ' is to be arranged on (as shown in Figure 4 C) on secondary signal layer 470, and passive matrix type touching display device 400 " colored filter 171 be to be arranged on first signal layer 480 (as shown in Figure 4 D).
With reference to figure 4B, controller 130 drives and sensing circuit 420 in order to control the first driving and sensing circuit 410 and second, makes the first driving circuit 415 and the second driving circuit 425 see through first signal line S1a～S1c and secondary signal line S2a～S2c (only take in Fig. 4 B three first signal lines and three secondary signal lines explain for example) and drives each pixel show image.The first driving and sensing circuit 410 comprise one first driving circuit 415 and a sensing circuit 215 ', the second drives and sensing circuit 420 comprises one second driving circuit 425 and a sensing circuit 215.Wherein, in the passive-matrix structure, each point of crossing of first signal line and secondary signal line is all a pixel.In addition, if the one group of first signal line and secondary signal line is sweep trace, another group is exactly data line, difference is that the scanning linear system sequentially receives the one scan signal that corresponding driving circuit sends, and data line can the while in during sweep signal activation (enable) or be received in proper order a plurality of data-signals that corresponding driving circuit sends.
During practical application, usually the first driving circuit 415 and a sensing circuit 215 ' are integrated into to same chip 410, and the second driving circuit 425 and a sensing circuit 215 are integrated into to another chip 420, and controller 130, chip 410,420 can be located at first substrate 280a or second substrate 270a is upper, or be located at the outside of substrate 280a.Sensing circuit 215 ' is connected to the output terminal of output buffer 651 of the first driving circuit 415 and the tie point of each first signal line, with the touch sensing that carries out the first signal line (as shown in Figure 6B, but the source electrode drive circuit 110 that must replace in original figure with the first driving circuit 415), and sensing circuit 215 is connected to the output terminal of output buffer 651 of the second driving circuit 425 and the tie point of each secondary signal line, with the touch sensing that carries out the secondary signal line (as shown in Figure 6A, but the gate driver circuit 120 that must replace in original figure with the second driving circuit 425).Sensing circuit 215,215 ' circuit are identical, as for sensing circuit 215,215 ' detailed function mode, will be described at Fig. 6 A to Fig. 6 C and Fig. 7 A to Fig. 7 H.
The cross-sectional view that Fig. 5 A is one of passive matrix type touching display device of the present invention embodiment.Fig. 5 B is one of Fig. 5 A partial structurtes enlarged perspectives, the circuit diagram of display layer, controller, the first driving and sensing circuit and the second driving and sensing circuit.With reference to figure 5A and Fig. 5 B, the structure of passive matrix type of the present invention touching display device 500 from user's direction from top to bottom respectively: first substrate 280a, liquid crystal layer 150, second substrate 270a and backlight module 160.
The below of first substrate 280a (on the surface away from the user) arranges a first signal layer 480, and the top of first substrate 280a (near on user's surface) arranges a polaroid 183.More form an antireflection film and a cloudy surface antiglare film (not shown) on polaroid 183.Antireflection film is in order to prevent light reflection, and the cloudy surface antiglare film, in order to prevent dazzle, certainly, is considered based on cost, can plated film or only plate antireflection film and the one of cloudy surface antiglare film.Second substrate 270a top (near on user's surface) arranges a secondary signal layer 470, and a colored filter 171 more is set on secondary signal layer 470.In addition, second substrate 270a below (on the surface away from the user) arranges a polaroid 173.Backlight module 160 is the bottom that is positioned at passive matrix type touching display device 500.Because first signal line S1a～S1c, secondary signal line S2a～S2c in Fig. 5 B, controller 130, first drive and sensing circuit 410 and second drives and circuit framework and Fig. 4 B of sensing circuit 420 are identical, at this not in repeating.
In another embodiment, colored filter 171 is to be located on the first signal layer 480 of first substrate 280a, as shown in Figure 5 C.Certainly, if when 500 of passive matrix type touching display device need monochromatic the demonstration, just without colored filter 171 is set.It is noted that, because the reaction velocity of liquid crystal is slower, passive-matrix structure 500,500 ' needs the first driving circuit 415 and the second driving circuit 425 to send higher magnitude of voltage, and liquid crystal is rotated.
Fig. 6 A shows the circuit framework figure of one of grid driving of the present invention and sensing circuit embodiment.With reference to figure 6A, sensing circuit 215 comprises a detection circuit 610 and a sensor circuit 620.The output terminal of each output buffer 651 (outputbuffer) of gate driver circuit 120 is connected with each sweep trace G1～Gn respectively, multiplexer 630 is according to the control signal CS1 of controller 130 generations, the output terminal Q of sensing circuit 215 is connected to one of them output terminal of a little output buffers 651, detectable signal is fed into to a corresponding sweep trace.For example, when the array base palte 280 above finger touches sweep trace G1, although have one deck array base palte 280 to be separated by between sweep trace G1 and finger, sweep trace G1 still can respond to touching in one's hands, this be because the present invention utilize a characteristic frequency detectable signal such as: frequency is the square wave detectable signal that 100KHz, amplitude are 5V, make to produce capacitance coupling effect (capacitance coupling, its equiva lent impedance Z between finger and sweep trace G1 cbe equivalent to " 1/jwC f", C wherein ffor the capacitive coupling value, w is frequency) because human body and surrounding enviroment form equipotential, and then see through the loop that human body forms a ground connection, make electric current, produce leakage current (leakage current) and flow to environment via human body during higher or lower than the ambient voltage value at detecting voltage.The present invention sees through the touching that the mode of detecting people's body leakage current is carried out sensing finger, and the equivalent electrical circuit of human body is comprised of capacitor C b and resistance R b.As for, in Fig. 4 B, the present invention second drives and the circuit framework of sensing circuit 420 and grid drives and sensing circuit 220 is identical, only gate driver circuit 120 need be replaced to the second driving circuit 425, at this not in repeating.
Fig. 6 B shows the circuit framework figure of one of source drive of the present invention and sensing circuit embodiment.With reference to figure 6B, sensing circuit 215 ' comprises a detection circuit 610 and a sensor circuit 620.The output terminal of each output buffer 651 (output buffer) of source electrode drive circuit 110 is connected with each data line D1～Di respectively, multiplexer 630 ' is according to control signal CS2, the output terminal Q of sensing circuit 215 is connected to one of them output terminal of a little output buffers 651, detectable signal is fed into to a corresponding data line.As for, in Fig. 4 B the present invention first drive and the circuit framework of sensing circuit 410 and source drive and sensing circuit 210 identical, only source electrode drive circuit 110 need be replaced to the first driving circuit 415, at this not in repeating.
On the other hand, in Fig. 6 A and Fig. 6 B embodiment, although grid driving and sensing circuit 220 and source drive and sensing circuit 210 (or the first driving and sensing circuit 410 and second driving and sensing circuit 420) only comprise respectively a sensing circuit, but the present invention does not limit the sensing circuit number of (215 or 215 '), in general the number of sensing circuit is more, measure efficiency higher, but hardware cost is also higher.Certainly, source electrode drive circuit 110 and gate driver circuit 120 (or the first driving circuit 415 and second driving circuit 425) also can share same sensing circuit, and hardware cost is minimum, can be at most but measured the time that once spent.Circuit designers can average out according to application demand between hardware cost and measurement efficiency.
In Fig. 6 A and Fig. 6 B embodiment, be to measure sweep trace and data line with sensing circuit 215 and sensing circuit 215 ' respectively, to determine whether to have finger touch.Below for convenience of description, be to take sensing circuit to measure sweep trace as example, coordinate Fig. 6 C, Fig. 7 A to Fig. 7 H to describe all embodiment of sensing circuit of the present invention in detail.Also identical as for the function mode of carrying out the detecting data line with sensing circuit, repeat no more.
Fig. 7 A shows the circuit framework figure of the first embodiment of sensing circuit of the present invention.With reference to figure 7A, sensing circuit 710 comprises a detection circuit 610 and a sensor circuit 620A.Detection circuit 610 comprises a waveform generator 711 and a voltage driver (voltage driver) 712, and sensor circuit 620A comprises an impact damper (buffer) 713 and a signal acquisition device (signalextracting unit) 714.
Please also refer to Fig. 6 A, in the present embodiment, waveform generator 711 is according to a fixed frequency f1, at each measurement period (measure time) t min, producing the digital signal m of a fixed cycle T (=1/f1), the class ratio detection signal a that voltage driver 712 produces a fixed cycle T (=1/f1) according to digital signal m sees through resistance R zand multiplexer 630, sequentially be transferred to all sweep trace G1～Gn, to be fixed the measurement of periodic signal.Because impact damper 713 has, input impedance (impedance) is high, the low characteristic of output impedance, impact damper 713 is to separate sweep trace G1～Gn and signal acquisition device 714 in this circuit, except the input impedance of itself enough high and do not affect each sweep trace dividing potential drop of prime, also because the output impedance of itself enough low and as same voltage source (voltage source) to drive late-class circuit.Impact damper 713 receives induced voltage V qto produce induced voltage V in, the relation that (gain) equals 1 because impact damper 713 itself gains, therefore two inductive voltage value V q, V incan equate.The induced voltage V that signal acquisition device 714 reception buffers 713 produce inafter, according to detectable signal a, carry out the signal acquisition processing, to produce a measuring value D.
While supposing that finger is not touched the present invention and touched display device, V qequal V mod, for example, when finger touches the present invention touches display device (touching the upper surface of array base palte 280), the whole piece loop is owing to through human body, producing the drain current path of ground connection, and then the formation dividing potential drop, after dividing potential drop, and voltage V qmagnitude of voltage from V modbe kept to
V mod* (1/jwC f+ R b+ 1/jwC b) ÷ (R z+ 1/jwC f+ R b+ 1/jwC b) wherein, V modfor the amplitude size of detectable signal a, the frequency that w=2 π f1 is detectable signal a, C ffor the coupling capacitance between human finger and sweep trace, the equivalent electrical circuit of human body is by capacitor C band resistance R binstitute forms.Therefore, when finger touches the present invention touches display device, the input voltage V of impact damper 713 qamplitude weakens, and then causes the output voltage V of impact damper 713 inthe output voltage V that amplitude is less than finger while not touching inamplitude.Signal acquisition device 714 utilizes detectable signal a to induced voltage V inwhile carrying out the signal acquisition processing, the action of itself is equivalent to an adder and multiplier, with analogous circuit, is equivalent to carry out following mathematical operation during signal acquisition device 714 calculated amount measured value D:
Figure BDA0000030071410000131
wherein, integration period (T2-T1) equals to measure time t m.Apparently, when finger is not touched, measuring value D can be larger; And, when finger touches the present invention touches display device, measuring value D can be less.Aspect circuit control; controller 130 usually can be known and will detect a particular scan (as G1) and send control signal CS1; so that multiplexer 630 is connected to sweep trace G1 by end points Q, then can judge according to measuring value D size whether sweep trace G1 has finger touches.Mode according to this, after controller 130 has sequentially been collected the corresponding measuring value D of all sweep traces, touch display device if finger has touched the present invention in fact, just can by the correct position of finger touches locate out.
When Fig. 8 display acquisition device carries out the signal acquisition processing, the schematic diagram that the positive negative term of noise meeting of different frequency disappears mutually.With reference to figure 8, suppose induced voltage V inat least comprise the noise of a DC noise, one frequency f<f1, the noise of one frequency f>f1 and the signal that a frequency equals f1, and detectable signal a is positioned at the below of Fig. 8, is the sequence of a fixed frequency f1 and cycle T.The present invention is based on the orthogonality characteristic of signal, only can take out the signal identical with the frequency f 1 of detectable signal a, if induced voltage V inthe signal comprised or the frequency of noise are greater than or less than this frequency f 1, and signal acquisition that signal acquisition device 714 carries out is processed and will be made its positive negative term disappear mutually, and to not contribution of last measuring value D.For example, in Fig. 8, the DC noise of the top is (1,1,1,1,1,1), the sequence of detectable signal a is (1 ,-1,1,-1,1 ,-1), it is addition again after each corresponding voltage of DC noise and detectable signal a is multiplied each other that signal acquisition that signal acquisition device 714 carries out is processed, and the sign of each corresponding voltage of DC noise and detectable signal a after multiplying each other is as shown in the sign under signal, because just positive negative term disappears mutually, so measuring value D=1*1+1* (1)+1*1+1* (1)+1*1+1* (1)=0.As for the signal with frequency f 1, be (1,-1,1,-1,1,-1), because identical with the sequence of detectable signal a, orthogonality characteristic based on signal, after signal acquisition device 714 carries out signal acquisition processing (each corresponding voltage that this is had to the signal of frequency f 1 and detectable signal a multiply each other after addition again), can not produce the effect that positive negative term disappears mutually, therefore can obtain measuring value D=1*1+ (1) * (1) of non-zero+1*1+ (1) * (1)+1*1+ (1) * (1)=6.Orthogonality characteristic based on signal, 714 of signal acquisition devices can take out signal and the noise identical with the frequency f 1 of detectable signal a, be equivalent to restituted signal and filter the noise (as low-frequency noise, 60Hz noise, 1/f noise etc.) of most of wave band, therefore the present embodiment can be avoided the interference (noise interference) of noise, the touching of correct response finger.
Fig. 7 B shows the circuit framework figure of the second embodiment of sensing circuit of the present invention.With the difference of the first embodiment, only be, so the signal acquisition device 714 of the first embodiment is the analogous circuit impact damper 713 of arranging in pairs or groups, so and the signal acquisition device 714 of the present embodiment is the digital circuit analogy digital quantizer (analog to digital converter) 715 of arranging in pairs or groups.After signal acquisition device 714 receives the digital signal bin of analogy digital quantizer 715 generations, while utilizing digital signal m to carry out the signal acquisition processing to digital signal bin, the action of itself is equivalent to an adder and multiplier, with digital circuit, is equivalent to the calculated amount measured value
Figure BDA0000030071410000141
wherein the number of total points N is equivalent to measure time t min, the number of times that digital signal m and digital signal bin multiply each other.Similarly, when finger is not touched, measuring value D can be larger; And, when finger touches the present invention touches display device, measuring value D can be less.Controller 130 equally can judge whether sweep trace has finger touches according to measuring value D size.The present embodiment can be avoided the interference of noise equally, the touching of correct response finger.
Fig. 7 C shows the circuit framework figure of the 3rd embodiment of sensing circuit of the present invention.With the difference of the first embodiment, be, sensor circuit 620C comprises a bandpass filter (band-pass filter) 731, one r.m.s. (root mean square) circuit 732 and an element 733.When bandpass filter 731 and r.m.s. circuit 732 are digital circuit, element 733 is an analogy digital quantizer; When bandpass filter 731 and r.m.s. circuit 732 are analogous circuit, element 733 is an impact damper.The frequency (fixed frequency f1) of the frequency central point of bandpass filter 731 and detectable signal a is identical, bandpass filter 731 receives input signal in the noise beyond filtering centre frequency f1, get its root-mean-square valve after the output signal of r.m.s. circuit 732 reception bandpass filters 731, with generation measured value D.Identical with the first embodiment and the second embodiment, when finger is not touched, measuring value D can large (V mod); And, when finger touches the present invention touches display device, can produce the grounding path of a leakage current, and then form dividing potential drop, after dividing potential drop, measuring value D can be less.Because the present embodiment is provided with bandpass filter 731, therefore the present embodiment can be avoided the interference of noise, the touching of correct response finger.
Fig. 7 D shows the circuit framework figure of the 4th embodiment of sensing circuit of the present invention.With the difference of the 3rd embodiment, be, sensor circuit 620D does not comprise bandpass filter 731.Advantage is that design cost is lower, and shortcoming is the impact of the irresistible noise of circuit.
Fig. 7 E shows the circuit framework figure of the 5th embodiment of sensing circuit of the present invention.With the difference of the first embodiment, be, the voltage driver 712 ' of detection circuit 610 ' measures time t in each section min, be according to digital signal m produce two of a fixed cycle T (=1/f1) altogether (common ground) just anti-phase square-wave signal a,
Figure BDA0000030071410000142
see through again resistance R zand multiplexer 630 is transferred to wantonly two adjacent scanning lines Gn-1, Gn.Sensor circuit 620E comprises a differential amplifier (differentialamplifier) 742 and a signal acquisition device 714.Multiplexer 630, according to the control signal CS1 of controller 130 generations, is connected to two adjacent scanning lines Gn-1, Gn by end points Q+, Q-, and differential amplifier 742 receives induced voltage V q+and induced voltage V q-to produce induced voltage V in.The present invention system utilizes differential amplifier 742 to have the characteristic of common mode noise rejection ability (commonmode noise rejection), if there is a low-frequency noise respectively two positive-negative input ends of differential amplifier 742 to be caused to noise, can be because positive negative disappears and can not react at output terminal.Above-mentioned detection circuit 610 ' produce two positive inversion signal a altogether,
Figure BDA0000030071410000151
to export two adjacent sweep trace Gn-1, Gn to, and receive the framework of the induced voltage of these two adjacent sweep trace Gn-1, Gn with differential amplifier 742, be designated hereinafter simply as differential architecture.The present embodiment can be avoided the interference of noise, the touching of correct response finger.
Fig. 9 A is the embodiment according to Fig. 7 E, in the situation that finger is touched the present invention, does not touch display device, the rough schematic of circuit.With reference to figure 9A, when finger is not touched, the output waveform of differential amplifier 742 and detectable signal a,
Figure BDA0000030071410000152
cycle consistent, mean that sequence is identical.
Fig. 9 B is the embodiment according to Fig. 7 E, when two sweep traces of two input ends that connect differential amplifier are sensed finger touches simultaneously, and the rough schematic of circuit.With reference to figure 9B, when the sweep trace of two input ends that connect differential amplifier 742 is sensed finger touches simultaneously, two sweep traces produce the drain current path of ground connection through human body, after dividing potential drop, and two input voltage V of differential amplifier 742 q+and V q-amplitude weaken simultaneously, and then cause the output voltage V of differential amplifier 742 inthe signal amplitude (as shown in Figure 9 A) that amplitude is less than finger while not touching.Comparison diagram 9A and Fig. 9 B can observe, the output waveform of differential amplifier 742 and detectable signal a,
Figure BDA0000030071410000153
cycle consistent, but voltage amplitude diminishes.
Fig. 9 C is the embodiment according to Fig. 7 E, when only having a sweep trace to sense finger touches, and the rough schematic of circuit.With reference to figure 9C, when the sweep trace of the negative input end that connects differential amplifier 742 is sensed finger touches, this sweep trace produces the drain current path of ground connection through human body, after dividing potential drop, and the voltage V of the negative input end of differential amplifier 742 q-amplitude weakens, and then causes the output voltage V of differential amplifier 742 inthe signal amplitude (as shown in Figure 9 A) that amplitude is less than finger while not touching.Now, the output waveform of differential amplifier 742 and detectable signal a,
Figure BDA0000030071410000154
cycle consistent, but voltage amplitude diminishes.Comparison diagram 9A to Fig. 9 C can observe, the output voltage V while only having a sweep trace to sense finger touches in3the output voltage V that amplitude is less than finger while not touching in1signal amplitude, but the output voltage V when being greater than two sweep traces and sensing finger touches simultaneously in2amplitude.During practical application, no matter only have a sweep trace or two sweep traces to sense finger touches, the output voltage V of differential amplifier 742 simultaneously inamplitude can dwindle equally, causes the measuring value D that the signal acquisition device 741 of rear class is exported also can dwindle (while not touching with respect to finger).
Fig. 7 F shows the circuit framework figure of the 6th embodiment of sensing circuit of the present invention.With the difference of the second embodiment, be, the present embodiment is differential architecture.The present embodiment can be avoided the interference of noise, the touching of correct response finger.
Note that in first and second embodiment of sensing circuit, when measuring each time, waveform generator 711 can also be according to the frequency of a plurality of random combines, at each measurement period (measure time) t min, producing the digital signal m in on-fixed cycle, voltage driver 712 produces on-fixed cycle and so on ratio detection signal a according to digital signal m again.Similarly, in the 5th and the 6th embodiment of sensing circuit, when measuring each time, waveform generator 711 can also be according to the frequency of a plurality of random combines, at each measurement period (measure time) t min, produce the digital signal m in on-fixed cycle, voltage driver 712 ' again according to digital signal m produce two of the on-fixed cycle altogether (common ground) just anti-phase square-wave signal a,
Figure BDA0000030071410000161
the frequency of random combine is all different owing to measuring each time, so circuit can not be subject to the interference of a certain characteristic frequency.Should be noted, Fig. 8 is presented at the signal acquisition device and carries out signal acquisition while processing, the noise of different frequency can produce the effect that positive negative term disappears mutually, be not only applicable to the measurement method of fixed cycle signal, also be applicable to the measurement method of on-fixed cycle (frequencies of a plurality of random combines) signal, difference is, in the measurement method of on-fixed periodic signal, the positive negative term of the noise of different frequency disappears fully mutually and must elongate time shaft and just can find out.
Fig. 7 G shows the circuit framework figure of the 7th embodiment of sensing circuit of the present invention.With the difference of the 3rd embodiment, be, the present embodiment is differential architecture.Sensor circuit 620G comprises a differential amplifier 742, an analogy digital quantizer 715, a bandpass filter 731 and r.m.s. circuit 732.Wherein, when bandpass filter 731 and r.m.s. circuit 732 are digital circuit, just analogy digital quantizer 715 need be set; When bandpass filter 731 and r.m.s. circuit 732 are analogous circuit, must cast out analogy digital quantizer 715.Due to analogy digital quantizer 715 inessential element, therefore be represented by dotted lines in the drawings.Because the present embodiment is provided with bandpass filter 731, therefore the present embodiment can be avoided the interference of noise, the touching of correct response finger.
Fig. 7 H shows the circuit framework figure of the 8th embodiment of sensing circuit of the present invention.With the difference of the 4th embodiment, be, the present embodiment is differential architecture.Sensor circuit 620H comprises a differential amplifier 742, an analogy digital quantizer 715 and r.m.s. circuit 732.Wherein, when r.m.s. circuit 732 is digital circuit, just analogy digital quantizer 715 need be set; When r.m.s. circuit 732 is analogous circuit, must cast out analogy digital quantizer 715.Due to analogy digital quantizer 715 inessential element, therefore be represented by dotted lines in the drawings.
It is noted that, the detectable signal a in above-mentioned Fig. 7 A to Fig. 7 H or
Figure BDA0000030071410000162
although all with square wave, illustrate, can also implement by a sine wave during practical application.
Fig. 6 C is the embodiment according to Fig. 6 A, when three sweep traces are formed to an induction channels, and the rough schematic of circuit.The coupling capacitance C of finger fbe about 1pF, in order to strengthen the intensity of induced signal of finger, can many adjacent scanning lines form induction channels (sensing channel), the contact area between this measure is equivalent to strengthen wire and point, and then increasing coupling capacitance C fcapacitance.With regard to the example of Fig. 6 C, be that three adjacent scanning lines G1～G3 are formed to first induction channels ch1, sweep trace G3～G5 can form second induction channels ch2, sweep trace G5～G7 and can form the 3rd induction channels ch3, by that analogy.Certainly, more than in Fig. 6 B, the bar adjacent data line also can form an induction channels.
Because the present invention touches display device, be to utilize sweep trace and data line to come show image and detecting finger touch, the detecting action that important prerequisite is finger touch can not affect picture disply.Figure 10 A to Figure 10 C is that sensing circuit of the present invention is pointed three kinds of different modes of sensing to sweep trace, and the square wave in figure means that corresponding sweep trace is during show image, and the string wave table shows that corresponding scanning linear system is in the finger during sensing.
During Figure 10 A means mainly to utilize vertical blank, (vertical blanking) carries out the finger touches sensing, and for fear of producing cross-talk (crosstalk) between adjacent scanning lines, carry out between the sweep trace of touch sensing at least being separated by a line, certainly, sweep trace G1, the G3, the G5...Gn that carry out touch sensing must be connected to different sensing circuits simultaneously, otherwise system can't be by the finger location.Note that this pattern also is applicable to sensing circuit of the present invention data line is pointed to sensing.
Figure 10 B means that when a certain sweep trace another sweep trace can be pointed sensing during in show state, but must use antimierophonic sensing circuit (i.e. the first to the 3rd embodiment and the 5th to the 7th embodiment), to avoid being subject to the interference of display.Certainly, it is more far better that the sweep trace that carries out the sweep trace of image display and carry out touch sensing is separated by, to avoid the phase mutual interference.The similar Figure 10 B of Figure 10 C, mean when a certain sweep trace during in show state, other multi-strip scanning lines can carry out touch sensing simultaneously, a line but the sweep trace that carries out touch sensing must at least be separated by simultaneously, to avoid between adjacent scanning lines producing cross-talk (crosstalk), and the sweep trace that carries out touch sensing must be connected to different sensing circuits simultaneously, otherwise system can't be by the finger location.
The pattern that note that Figure 10 B and Figure 10 C is not suitable for sensing circuit of the present invention data line is carried out to touch sensing.In addition, for fear of the touch sensing action, affect picture disply, in the active matrix drive mode, must note avoiding detectable signal a by thin film transistor (TFT) conducting (V gs>0), and then affect the magnitude of voltage of liquid crystal capacitance 116.Solution of the present invention is: the magnitude of voltage of the detectable signal a of sensing circuit feed-in sweep trace must, lower than the magnitude of voltage of the detectable signal a of sensing circuit feed-in data line, make V gs<0, to avoid thin film transistor (TFT) 115, mislead.
In sum, the present invention is by the position turned upside down by relative substrate and array base palte, make the array base palte 280 that comprises data line and sweep trace be positioned at top (approaching one of user side), and 270 of the relative substrates at public electrode 172 places are positioned at below (away from one of user side), therefore, the present invention just can utilize the interlaced active matrix drive structure of data line and sweep trace, and the mode that sees through detecting people body leakage current is carried out the touching of correct finger sensing.Need not additional touching device, the present invention utilizes active matrix drive structure or the original passive-matrix drives structure of turned upside down, coordinate characteristic and the design of antimierophonic sensing circuit of human body conductor, touching and the circuit design shown are integrated, the function of processes and displays and multi-point touch, reduce hardware cost and save the energy simultaneously.
Though with embodiment, the present invention is described above, does not therefore limit the present invention's scope, only otherwise the main idea that breaks away from the present invention, the sector person can carry out various distortion or change.

Claims (43)

1. an active matrix touching display device, is characterized in that, described device comprises:
Array basal plate, on its surface away from the user, be provided with a signals layer, comprise many data lines and multi-strip scanning line, each confluce of wherein said data line and described sweep trace configures respectively a pixel cell, and each pixel cell is provided with a switching element and a pixel electrode;
One relative substrate, parallel with respect to described array base palte and be positioned at the side away from the user;
One public electrode, with respect to described pixel electrode, be located on close user's the surface of described relative substrate;
One display material, be sandwiched between described array base palte and described relative substrate;
One gate driver circuit, the pixel cell that each described sweep trace of sequentially activation connects, wherein, form a plurality of the first tie points between the output terminal of described gate driver circuit and described sweep trace;
The one source pole driving circuit, provide a plurality of data-signals, and export corresponding pixel cell to via described data line, wherein, forms a plurality of the second tie points between the output terminal of described source electrode drive circuit and described data line;
At least one sensing circuit, carry out touch sensing in order at least one to described data line and described sweep trace, and each sensing circuit comprises:
One detection circuit, according at least one frequency, produce a detectable signal to export at least one of described the first tie point and described the second tie point to; And
One sensor circuit, receive at least one output signal of corresponding tie point, carries out the signal acquisition processing, to produce a measuring value; And
One controller, in order to control described source electrode drive circuit, described gate driver circuit and described at least one sensing circuit;
Wherein, described detectable signal and output signal are voltage signal.
2. touching display device as claimed in claim 1, is characterized in that, described detection circuit comprises:
One waveform generator, according to described at least one frequency, fixedly in the measurement time, produce a digital signal one; And
One voltage driver, according to described digital signal, produce described detectable signal.
3. touching display device as claimed in claim 1, it is characterized in that, wherein, in during a picture disply and the one of described sweep trace system when show state, described sensing circuit carries out touch sensing at least one of the non-conterminous described sweep trace in the described sweep trace in show state.
4. touching display device as claimed in claim 3, it is characterized in that, wherein when the described sweep trace that simultaneously carries out touch sensing is connected to different sensing circuit, it is non-conterminous carrying out between each described sweep trace of touch sensing, wherein when the described sweep trace that carries out touch sensing is connected to same sensing circuit, it is adjacent carrying out between each described sweep trace of touch sensing.
5. touching display device as claimed in claim 1, is characterized in that, described sensor circuit comprises:
One bandpass filter, in order to according to a frequency filtering, after at least one of described output signal is carried out to the filtering processing, produce a filtering signal; And
One r.m.s. circuit, receive described filtering signal, carries out the r.m.s. computing, and to produce described measuring value, wherein, described at least one frequency is that a fixed frequency and described frequency filtering equal described fixed frequency.
6. touching display device as claimed in claim 1, is characterized in that, described sensor circuit comprises:
One signal acquisition device, receive at least one of described output signal, according to described detectable signal, carries out the signal acquisition processing, to produce described measuring value;
Wherein, the frequency that described at least one frequency is a fixed frequency or a plurality of random combines.
7. touching display device as claimed in claim 1, is characterized in that, described detectable signal comprises two positive phase signals and reverse signals altogether.
8. touching display device as claimed in claim 7, is characterized in that, described sensor circuit comprises:
One differential amplifier, receive the two of described output signal, in order to the filtering low-frequency noise, to produce an induced signal;
One bandpass filter, in order to according to a frequency filtering, after described induced signal is carried out to the filtering processing, produce a filtering signal; And
One r.m.s. circuit, receive described filtering signal, carries out the r.m.s. computing, and to produce described measuring value, wherein, described at least one frequency is that a fixed frequency and described frequency filtering equal described fixed frequency.
9. touching display device as claimed in claim 7, is characterized in that, described sensor circuit comprises:
One differential amplifier, receive the two of described output signal, in order to the filtering low-frequency noise, to produce an induced signal; And
One signal acquisition device, receive described induced signal, according to described detectable signal, carries out the signal acquisition processing, to produce described measuring value;
Wherein, the frequency that described at least one frequency is a fixed frequency or a plurality of random combines.
10. touching display device as claimed in claim 1, is characterized in that, wherein, in the same time during a vertical blank, described at least one sensing circuit carries out touch sensing at least one of described data line and described sweep trace.
11. touching display device as claimed in claim 10, it is characterized in that, wherein when the described sweep trace that simultaneously carries out touch sensing is connected to different sensing circuit, it is non-conterminous carrying out between each described sweep trace of touch sensing, wherein when the described scanning linear system of carrying out touch sensing is connected to same sensing circuit, it is adjacent carrying out between each described sweep trace of touch sensing.
12. touching display device as claimed in claim 10, it is characterized in that, wherein when the described data linear system of simultaneously carrying out touch sensing is connected to different sensing circuit, it is non-conterminous carrying out between each described data line of touch sensing, wherein when the described data linear system of carrying out touch sensing is connected to same sensing circuit, it is adjacent carrying out between each described data line of touch sensing.
13. touching display device as claimed in claim 10, is characterized in that, described sensor circuit comprises:
One r.m.s. circuit, receive at least one of described output signal, carries out the r.m.s. computing, and to produce described measuring value, wherein, described at least one frequency is a fixed frequency.
14. touching display device as claimed in claim 13, it is characterized in that, wherein when described detectable signal comprises two positive phase signals altogether and reverse signal, described sensor circuit more comprises a differential amplifier, it is the front stage circuits of described r.m.s. circuit, receive both of described output signal, in order to the filtering low-frequency noise, produce an induced signal to be sent to described r.m.s. circuit.
15. touching display device as claimed in claim 1, is characterized in that, the one that described display material is a plurality of microcapsules, a plurality of EL part and liquid crystal.
16. touching display device as claimed in claim 15, wherein, when described display material is liquid crystal, described touching display device more comprises:
One first polaroid, be located on close user's the surface of described array base palte;
One second polaroid, be located on the surface away from the user of described relative substrate;
One colored filter, be located at described relative substrate close user the surface and described public electrode between or on described signals layer; And
One backlight module, be located on described second polaroid of described relative substrate, is used for producing light to compensate the intensity of an environment light source.
17. touching display device as claimed in claim 15, it is characterized in that, wherein when described display material be that a plurality of EL parts that send white light and described touching display device are while being a color monitor, described touching display device more comprises a colored filter, be located at described relative substrate close user the surface and described public electrode between or on described signals layer.
18. touching display device as claimed in claim 15, it is characterized in that, wherein when described display material is described EL part, the one that described EL part is light emitting diode, Organic Light Emitting Diode and polymer LED.
19. touching display device as claimed in claim 1, is characterized in that, the magnitude of voltage that wherein is fed into the detectable signal of described the first tie point is the magnitude of voltage lower than the detectable signal that is fed into described the second tie point.
20. touching display device as claimed in claim 1, is characterized in that, wherein, while carrying out touch sensing each time, each described sensing circuit is respectively an induction channels to be carried out to touch sensing, and wherein, described induction channels comprises many adjacent scanning lines or many adjacent data lines.
21. touching display device as claimed in claim 1, is characterized in that, wherein, the material of described array base palte and the material of described relative substrate are the one of plastic cement, glass and thin metal.
22. touching display device as claimed in claim 1, is characterized in that, wherein, described switching device is a thin film transistor (TFT).
23. a passive matrix type touching display device, is characterized in that, described device comprises:
One first substrate, on its surface away from the user, be provided with a first signal layer, comprises many first signal lines;
One second substrate, parallel with respect to described first substrate and be located at the side away from the user, on the close user's of described second substrate surface, be provided with a secondary signal layer, comprise many secondary signal lines, interlaced arrangement between wherein said first signal line and described secondary signal;
One display material, be sandwiched between described first substrate and described second substrate;
One first driving circuit, in order to supply at least one the first voltage signal to described first signal line, wherein, form a plurality of the first tie points between the output terminal of described the first driving circuit and described first signal line;
One second driving circuit, in order to supply at least one second voltage signal to described secondary signal line, wherein, the output terminal of described the second driving circuit and described secondary signal line form a plurality of the second tie points;
At least one sensing circuit, carry out touch sensing in order at least one to described first signal line and described secondary signal line, and each sensing circuit comprises:
One detection circuit, according at least one frequency, produce a detectable signal to export at least one of described the first tie point and described the second tie point to; And
One sensor circuit, receive at least one output signal of corresponding tie point, carries out the signal acquisition processing, to produce a measuring value; And
One controller, in order to control described the first driving circuit, described the second driving circuit and described at least one sensing circuit;
Wherein, described detectable signal and output signal are voltage signal.
24. touching display device as claimed in claim 23, is characterized in that, described detection circuit comprises:
One waveform generator, according to described at least one frequency, fixedly in the measurement time, produce a digital signal one; And
One voltage driver, according to described digital signal, produce described detectable signal.
25. touching display device as claimed in claim 23, it is characterized in that, described first signal line layer and described secondary signal line layer are respectively one scan line layer or a data line layer, but described first signal line layer and described secondary signal line layer differ from one another, wherein, described sweep trace layer comprises the multi-strip scanning line and described data line layer comprises many data lines.
26. touching display device as claimed in claim 25, it is characterized in that, wherein, in during a picture disply and the one of described sweep trace when show state, described sensing circuit system carries out touch sensing at least one of the non-conterminous described sweep trace in the described sweep trace in show state.
27. touching display device as claimed in claim 26, it is characterized in that, wherein when the described scanning linear system of simultaneously carrying out touch sensing is connected to different sensing circuit, it is non-conterminous carrying out between each described sweep trace of touch sensing, when the described scanning linear system of carrying out touch sensing is connected to same sensing circuit, it is adjacent carrying out between each described sweep trace of touch sensing.
28. touching display device as claimed in claim 23, is characterized in that, described sensor circuit comprises:
One bandpass filter, in order to according to a frequency filtering, after at least one of described output signal is carried out to the filtering processing, produce a filtering signal; And
One r.m.s. circuit, receive described filtering signal, carries out the r.m.s. computing, and to produce described measuring value, wherein, described at least one frequency is that a fixed frequency and described frequency filtering equal described fixed frequency.
29. touching display device as claimed in claim 23, is characterized in that, described sensor circuit comprises:
One signal acquisition device, receive at least one of described output signal, according to described detectable signal, carries out the signal acquisition processing, to produce described measuring value;
Wherein, the frequency that described at least one frequency is a fixed frequency or a plurality of random combines.
30. touching display device as claimed in claim 23, is characterized in that, described detectable signal comprises two positive phase signals and reverse signals altogether.
31. touching display device as claimed in claim 30, is characterized in that, described sensor circuit comprises:
One differential amplifier, receive the two in described output signal, in order to the filtering low-frequency noise, to produce an induced signal;
One bandpass filter, in order to according to a frequency filtering, after described induced signal is carried out to the filtering processing, produce a filtering signal; And
One r.m.s. circuit, receive described filtering signal, carries out the r.m.s. computing, and to produce described measuring value, wherein, described at least one frequency is that a fixed frequency and described frequency filtering equal described fixed frequency.
32. touching display device as claimed in claim 30, is characterized in that, described sensor circuit comprises:
One differential amplifier, receive the two in described output signal, in order to the filtering low-frequency noise, to produce an induced signal; And
One signal acquisition device, receive described induced signal, according to described detectable signal, carries out the signal acquisition processing, to produce described measuring value;
Wherein, the frequency that described at least one frequency is a fixed frequency or a plurality of random combines.
33. touching display device as claimed in claim 23, is characterized in that, wherein, in the same time during a vertical blank, each described sensing circuit system carries out touch sensing at least one of described first signal line and described secondary signal line.
34. touching display device as claimed in claim 33, it is characterized in that, wherein when the described first signal linear system of simultaneously carrying out touch sensing is connected to different sensing circuit, it is non-conterminous carrying out between each described first signal line of touch sensing, wherein when the described first signal linear system of carrying out touch sensing is connected to same sensing circuit, it is adjacent carrying out between each described first signal line of touch sensing.
35. touching display device as claimed in claim 33, it is characterized in that, wherein when the described secondary signal linear system of simultaneously carrying out touch sensing is connected to different sensing circuit, it is non-conterminous carrying out between each described secondary signal line of touch sensing, wherein when the described secondary signal linear system of carrying out touch sensing is connected to same sensing circuit, it is adjacent carrying out between each described secondary signal line of touch sensing.
36. touching display device as claimed in claim 33, is characterized in that, described sensor circuit comprises:
One r.m.s. circuit, receive at least one of described output signal, carries out the r.m.s. computing, and to produce described measuring value, wherein, described at least one frequency is a fixed frequency.
37. touching display device as claimed in claim 36, it is characterized in that, wherein when described detectable signal comprises two positive phase signals altogether and reverse signal, described sensor circuit more comprises a differential amplifier, it is the front stage circuits of described r.m.s. circuit, receive the two in described output signal, in order to the filtering low-frequency noise, produce an induced signal to be sent to described r.m.s. circuit.
38. touching display device as claimed in claim 23, is characterized in that, described display material is a kind of in a plurality of microcapsules, a plurality of EL part and liquid crystal.
39. touching display device as claimed in claim 23, is characterized in that, wherein, when described display material is liquid crystal, described touching display device more comprises:
One first polaroid, be located on close user's the surface of eyes of described first substrate;
One second polaroid, be located on the surface of the eyes away from the user of described second substrate;
One colored filter, be located on described first signal layer or on described secondary signal layer; And
One backlight module, be located on described second polaroid of described second substrate, is used for producing light to compensate the intensity of an environment light source.
40. touching display device as claimed in claim 38, it is characterized in that, wherein when described display material be that a plurality of EL parts that send white light and described touching display device are while being a color monitor, described touching display device more comprises a colored filter, is located on described first signal layer or on described secondary signal layer.
41. touching display device as claimed in claim 38, it is characterized in that, wherein when described display material is described EL part, described EL part is a kind of in light emitting diode, Organic Light Emitting Diode and polymer LED.
42. touching display device as claimed in claim 23, it is characterized in that, wherein, while carrying out touch sensing each time, each described sensing circuit is respectively an induction channels to be carried out to touch sensing, wherein, described induction channels comprises many adjacent first signal wires or many adjacent second signal lines.
43. touching display device as claimed in claim 23, is characterized in that, wherein, the material of described first substrate and the material of described second substrate are a kind of in plastic cement, glass and thin metal.
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