CN102455812A - Touch display device - Google Patents

Touch display device Download PDF

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Publication number
CN102455812A
CN102455812A CN2010105269641A CN201010526964A CN102455812A CN 102455812 A CN102455812 A CN 102455812A CN 2010105269641 A CN2010105269641 A CN 2010105269641A CN 201010526964 A CN201010526964 A CN 201010526964A CN 102455812 A CN102455812 A CN 102455812A
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signal
display device
circuit
touching display
frequency
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CN2010105269641A
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CN102455812B (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 that shows with the multi-point touch function of integrating.
Background technology
Figure 1A is the cross-sectional view of 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 shows signal layer, controller, source electrode drive circuit and gate driver circuit.Fig. 1 C is one of the pel array of a Figure 1B partial circuit diagram.TFT LCD system among Figure 1A～Fig. 1 C adopts active-matrix (Active Matrix) type of drive to come array of display pixels.
With reference to Figure 1A, polaroid (polarizer) 173 is located at relative substrate (substrate) 170 tops, examines the sheet that shakes in order to detect the polarization direction after this incident polarized light rotates through through liquid crystal, to be called again.Polaroid 183 is located at array base palte 180 belows, in order to change the polarization of incident light direction, is called the starting of oscillation sheet again.Relatively the element on the substrate 170 comprise three kinds of colors colored filter (color filter, CF) 171, represent the RGB three primary colors of each pixel respectively; In addition, whole piece ITO transparent conductor film is set more on the colored filter 171, as the public electrode (common electrode) 172 of liquid crystal capacitance 116.(backlight) backlight module 160 is to be used for producing the intensity of light with the compensate for ambient light source.
Array base palte 180 tops are provided with 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 (being that example is explained with three data lines and three sweep traces only among Figure 1B) deposits the show image value in the pel array each pixel cell.Wherein, (being each pixel cell) all is provided with a thin film transistor (TFT) 115, a liquid crystal capacitance (capacitor) 116 and a storage capacitors 117 near the point of crossing of each data line and sweep trace.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 by pixel electrode 116a, public electrode (common electrode, Vcom) 172 and 150 compositions of liquid crystal layer.Thin film transistor (TFT) 115 is equivalent to the function of switch, can display voltage (display voltage) be stored among the 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.Liquid crystal capacitance 116 stored display voltage values can be rotated the orientation of liquid crystal, and then change the polarization of incident light direction, and collocation is two polaroids 173,183 up and down, can determine the brightness value that this point is shown.The function of storage capacitors 117 is that auxiliary liquid crystal capacitance 116 comes store charge.
Traditional touching display device is to add the touching device in 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 formula touching display device; Utilize the active matrix drive structure of turned upside down; Cooperate the 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 formula touching display device of the present invention 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, wherein each confluce of those data lines and those sweep traces disposes a pixel cell respectively, and each pixel cell is provided with one and switches an element and a pixel electrode; One relative substrate, parallel with respect to this array base palte and be positioned at side away from one of user; One public electrode with respect to those pixel electrodes, is located on the surface near the user of this relative substrate; One display material is sandwiched between this array base palte and this relative substrate; One gate driver circuit, the activation pixel cell that respectively this sweep trace connected wherein, forms a plurality of first tie points between the output terminal of this gate driver circuit and those data lines in regular turn; The one source pole driving circuit provides a plurality of data-signals, and exports corresponding pixel cell to via those data lines, wherein, forms a plurality of second tie points between the output terminal of this source electrode drive circuit and those data lines; At least one sensing circuit; One of which at least in order to those data lines and those sweep traces carries out touch sensing; Each sensing circuit comprises: a detection circuit according at least one frequency, produces a detectable signal to export the one of which at least of those first tie points and those second tie points to; And a sensor circuit receives at least one output signal of corresponding tie point, carries out signal acquisition and handles, to produce a measuring value; And a controller is 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 provides a kind of passive matrix type touching display device, comprises: one first substrate, on its surface, be provided with one first signals layer away from the user, and comprise many first signal wires; One second substrate; Parallel with respect to this first substrate and be located at side away from one of user, on the surface near the user of this second substrate, be provided with a secondary signal layer; Comprise many secondary signal lines, wherein interlaced arrangement between those first signal wires and those secondary signals; One display material is sandwiched between this first substrate and this second substrate; One first driving circuit in order to supply at least one first voltage signal to those first signal wires, wherein, forms a plurality of first tie points between the output terminal of this first driving circuit and those first signal wires; 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 second tie points; At least one sensing circuit; One of which at least in order to those first signal wires and those secondary signal lines carries out touch sensing; Each sensing circuit comprises: a detection circuit; According at least one frequency, produce a detectable signal to export the one of which at least of those first tie points and those second tie points to; And a sensor circuit receives at least one output signal of corresponding tie point, carries out signal acquisition and handles, to produce a measuring value; And a controller is 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 further be understood from the technical characterictic that the present invention disclosed.State with other purposes for letting on the present invention, feature and advantage can be more obviously understandable, hereinafter is special to be lifted embodiment and cooperates appended graphicly, elaborates as follows.
Description of drawings
Figure 1A is a cross-sectional view of conventional thin film transistor liquid crystal panel;
Figure 1B is the partial structurtes enlarged perspective of Figure 1A, the circuit diagram of shows signal layer, controller, source electrode drive circuit and gate driver circuit;
Fig. 1 C is a partial circuit diagram of the pel array of Figure 1B;
Fig. 2 A is the cross-sectional view of an embodiment of active-matrix formula touching display device of the present invention;
Fig. 2 B is the partial structurtes enlarged perspective of Fig. 2 A, the circuit diagram of shows signal layer, controller, source drive and sensing circuit and gate driving and sensing circuit;
Fig. 2 C shows the cross-sectional view of another embodiment of active-matrix formula touching display device, and wherein, colored filter system is arranged between public electrode and the relative substrate;
Fig. 2 D shows the cross-sectional view of another embodiment of active-matrix formula touching display device, and wherein, colored filter system is located on the signals layer;
Fig. 3 A is the cross-sectional view of another embodiment of active-matrix formula touching display device of the present invention;
Fig. 3 B is the partial structurtes enlarged perspective of Fig. 3 A, the circuit diagram of shows signal layer, controller, source drive and sensing circuit and gate driving and sensing circuit;
Fig. 3 C shows the cross-sectional view of another embodiment of active-matrix formula touching display device, and wherein, colored filter system is located on the signals layer of array base palte;
Fig. 4 A is the cross-sectional view of an embodiment of passive matrix type touching display device of the present invention;
Fig. 4 B is the partial structurtes enlarged perspective of Fig. 4 A, the circuit diagram of shows signal layer, controller, first driving and sensing circuit and 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 first signals layer;
Fig. 5 A is the cross-sectional view of an embodiment of passive matrix type touching display device of the present invention;
Fig. 5 B is the partial structurtes enlarged perspective of Fig. 5 A, the circuit diagram of shows signal layer, controller, first driving and sensing circuit and 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 first signals layer of array base palte;
Fig. 6 A shows the circuit framework figure of an embodiment of gate driving of the present invention and 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 an induction channels, and the rough schematic of circuit;
Fig. 7 A shows the circuit framework figure of first embodiment of sensing circuit of the present invention;
Fig. 7 B shows the circuit framework figure of 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 shows signal acquisition device carries out the signal acquisition processing, the synoptic 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, does not touch under the situation that the present invention touches display device the rough schematic of circuit at finger;
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 having only a sweep trace to sense finger touches, and the rough schematic of circuit;
Figure 10 A to Figure 10 C is sensing circuit of the present invention is pointed sensing to sweep trace three kinds of different modes.
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 formula touching display device
210 source drive and sensing circuit
220 gate driving and sensing circuit
215,215 ', 710,720,730 sensing circuits
740,750,760,770,780 sensing circuits
250 display materials
300,300 ' active-matrix formula 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 signals 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 BPF.s
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 wire
S2a～S2c secondary signal line
C fCoupling capacitance
C b, R bThe human body equivalent electrical circuit
The first substrate 280a
The second substrate 270a
Embodiment
Following explanation will be enumerated several preferable example embodiment of the present invention, for example: various electronic circuits, element and associated method.Being familiar with this area person 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 characteristic among the embodiment.In addition, many details of being known no longer repeat to show or give unnecessary details, to avoid fuzzy the present invention's emphasis.
Fig. 2 A is the cross-sectional view of 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 shows signal layer, controller, source drive and sensing circuit and gate driving and sensing circuit.With reference to figure 2A and Fig. 2 B, the structure of active-matrix formula of the present invention touching display device 200 mainly is divided into: array base palte 280, display material 250 and relative substrate 270 from user's direction from top to bottom.Substrate 270 tops are provided with a public electrode 172 relatively; And array base palte 280 belows (on the surface away from the user) is provided with a signals layer 181; Comprise crisscross data line D1～D3 and sweep trace G1～G3 (is that example is explained with three data lines and three sweep traces only at this), form a pel array.Wherein, each confluce disposes a pixel cell respectively near the point of crossing of each data line and sweep trace, and each pixel cell is provided with a thin film transistor (TFT) 115 and a pixel electrode 116a (shown in Fig. 1 C).In this manual, the element of same numeral has identical function, structure or material, at this not in giving unnecessary details.According to the present invention, the material of array base palte 280 and relative substrate 270 can be the one of which 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 the user finger because at a distance from one deck conductor, promptly public electrode 172, make data line and sweep trace can't sense the touching of finger.The present invention is by after exchanging the position of relative substrate and array base palte up and down; Shown in Fig. 2 A; The array base palte 280 that comprises data line and sweep trace is positioned at top (near one of user side); The relative substrate 270 at public electrode 172 places then is positioned at below (away from one of user side), not only makes signals layer 181 more near 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 human body leakage current has been come the touching of correct finger sensing.It is noted that; The present invention need not change original processing procedure of relative substrate 270 and array base palte 280; Only need when encapsulation the turned upside down of relative substrate 270 with array base palte 280; And pour into or sandwich one deck display material 250 betwixt and get final product, simultaneously, the relative substrate 270 and the array base palte 280 of turned upside down can't influence display quality.
With reference to figure 2B, controller 130 is in order to control source drive and sensing circuit 210 and gate driving and sensing circuit 220, and source drive and sensing circuit 210 are connected to data line D1～D3, and gate driving and sensing circuit 220 are connected to sweep trace G1～G3.Gate driving and sensing circuit 220 comprise a gate driver circuit 120 and a sensing circuit 215, and source drive and sensing circuit 210 comprise an 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 same chip 210, and gate driver circuit 120 and sensing circuit 215 are integrated into another chip 220.And controller 130, chip 210,220 can be located at array base palte 280 or relatively on the substrate 270, perhaps be located at outside the array base palte 280, for example, and on the framework of display.Source electrode drive circuit 110 and gate driver circuit 120 are used to drive the image demonstration of this pel array; And sensing circuit 215 ' is connected to output terminal and the tie point (shown in Fig. 6 B) of each data line of the output buffer 651 of source electrode drive circuit 110, to carry out the touch sensing of data line.Sensing circuit 215 is connected to output terminal and the tie point (shown in Fig. 6 A) of each sweep trace of the output buffer 651 of gate driver circuit 120, to carry out the touch sensing of sweep trace.In this instructions, sensing circuit 215,215 ' circuit are identical, only represent the diverse location at place by different labels.To introduce at Fig. 6 A to Fig. 6 C and Fig. 7 A to Fig. 7 H as for sensing circuit 215,215 ' detailed operation mode.
Display material 250 comprises microcapsules (microcapsules) and photoelectricity exciting light (electro luminescence) element etc.; But the present invention's application is as limit, and existing or other display materials of developing out in the future are also applicable to the present invention's notion.Among one embodiment, this display material 250 is to utilize microcapsules to implement, and active-matrix formula touching display device 200 realizes that one combines touching and microcapsules electric ink to show (electrophoretic display, EPD) the touching display device of function.Among another embodiment; This display material 250 is to utilize EL part to implement; But electro-exciting light-emitting display active illuminating; Reaching the function that strengthens luminance brightness and power saving, and active-matrix formula touching display device 200 realizes a touching display device that combines touching and electroluminescence Presentation Function, and prerequisite is that this EL part can send the trichromatic light of RGB or 200 of active-matrix formula touching display device need the monochrome demonstration.This is because microcapsules itself have color or EL part can send the trichromatic light of RGB voluntarily or 200 of touching display device need monochromatic the demonstration, so in the structure of active-matrix formula 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, and existing or other EL parts of developing out in the future are also applicable to the present invention's notion.
On the other hand; When EL part can't send trichromatic light of RGB and the colored demonstration of touching display device needs; In the structure of touching display device a colored filter 171 need be set in addition; For example: the colored filter 171 of active-matrix formula touching display device 200 ' is to be arranged on (shown in Fig. 2 C) between public electrode 172 and the relative substrate 270, and active-matrix formula touching display device 200 " colored filter 171 be to be arranged on the signals layer 181 (shown in Fig. 2 D).
Fig. 3 A is the cross-sectional view of another embodiment of active-matrix formula touching display device of the present invention.Fig. 3 B is one of Fig. 3 A partial structurtes enlarged perspectives, the circuit diagram of shows signal layer, controller, source drive and sensing circuit and gate driving and sensing circuit.With reference to figure 3A, the structure of active-matrix formula of the present invention touching display device 300 mainly is divided into from user's direction from top to bottom: 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 which of plastic cement, glass and thin metal.
The below of array base palte 280 (on the surface away from the user) is provided with a signals layer 181, and the top of array base palte 280 (on the surface near the user) is provided with a polaroid 183.Form a reflection on the polaroid 183 and prevent (AR) film, and more form a cloudy surface anti-dazzle (AG) film (figure does not show) on the antireflection film.Antireflection film is in order to prevent light reflection, and the cloudy surface antiglare film then in order to prevent dazzle, certainly, is considered based on cost, can plated film or only plate antireflection film and the one of which of cloudy surface antiglare film.Substrate 270 tops (on the surface near the user) are provided with 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) are provided with a polaroid 173 relatively.Backlight module 160 is the bottom that is positioned at active-matrix formula touching display device 300.Because circuit framework and Fig. 2 B of data line D1～D3, sweep trace G1～G3, controller 130, source drive and sensing circuit 210 and gate driving and sensing circuit 220 are identical among Fig. 3 B, at this not in giving unnecessary details.
In another embodiment, colored filter 171 is to be located on the signals layer 181 of array base palte 280, shown in Fig. 3 C.Certainly, when needing monochromatic the demonstration, just need not to be provided with colored filter 171 as if 300 of active-matrix formula touching display device.
Above-mentioned all embodiment all belong to active matrix configuration, and active matrix configuration system utilizes TFT that display voltage is stored among the liquid crystal capacitance 116, and this electric capacity 116 can be used for continuing to keep the magnitude of voltage of ' liquid crystal is rotated '.Relatively, passive-matrix (passive matrix) structure is not provided with TFT and public electrode, is pressed on x direction electrode and the y direction electrode but directly power up; The color of each point of crossing (being each pixel) is changed; With as showing,, generally be applied to twist orientation (twisted nematic so making is simple, with low cost; TN) (supertwisted nematic is STN) among the LCD for LCD, supertwist orientation.Because the passive-matrix structure just is not provided with public electrode originally, the present invention can directly utilize the passive-matrix structure of data line and sweep trace, and sees through the touching that the mode of detecting the human body leakage current is come correct finger sensing.
Fig. 4 A is the cross-sectional view of 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 shows signal layer, controller, first driving and sensing circuit and second driving and sensing circuit.
With reference to figure 4A, the structure of passive matrix type of the present invention touching display device 400 mainly is divided into: the first substrate 280a, display material 250 and the second substrate 270a from user's direction from top to bottom.First substrate 280a below (on the surface away from the user) is provided with one first signals layer 480, comprises many first almost parallel signal wires.Second substrate 270a top (on the surface near the user) is provided with a secondary signal layer 470, comprises many almost parallel secondary signal lines, and, those first signal wires and the spatially interlaced arrangement of those secondary signal lines.As stated; The passive-matrix structure is not provided with public electrode; Therefore no matter can't be isolated by any conductor between first signals layer 480 or secondary signal layer 470 and the user finger; Even secondary signal layer 470 and user's distance is far away slightly, still can utilize the interlaced matrix driving structure of first signal wire and secondary signal line and see through the mode of detecting the human 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, and existing or other display materials of developing out in the future are also applicable to the present invention's notion.Among 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 that combines touching and microcapsules electric ink Presentation Function.Among another embodiment; This display material 250 is to utilize EL part to implement; But electro-exciting light-emitting display active illuminating; Reaching the function that strengthens luminance brightness and power saving, and passive matrix type touching display device 400 realizes a touching display device that combines touching and electroluminescence Presentation Function, and prerequisite is that this EL part can send the trichromatic light of RGB or 400 of touching display device need the monochrome demonstration.This is because microcapsules itself have color or EL part can send the trichromatic light of RGB voluntarily or 400 of touching display device need monochromatic the demonstration, so 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 when needing colored the demonstration; In the structure of touching display device a colored filter 171 need be set in addition; For example: the colored filter 171 of passive matrix type touching display device 400 ' is to be arranged on (shown in Fig. 4 C) on the secondary signal layer 470, and passive matrix type touching display device 400 " colored filter 171 be to be arranged on first signals layer 480 (shown in Fig. 4 D).
With reference to figure 4B; Controller 130 drives and the sensing circuit 410 and second driving and the sensing circuit 420 in order to control first, makes first driving circuit 415 and second driving circuit 425 drive each pixel show image through first signal wire S1a～S1c and secondary signal line S2a～S2c (being that example is explained with three first signal wires and three secondary signal lines only among Fig. 4 B).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 wire and secondary signal line all is a pixel.In addition; If the one of which group of first signal wire and secondary signal line is a sweep trace; Another group is exactly a data line; Difference is that the scanning linear system receives the one scan signal that corresponding driving circuit sends in regular turn, and data line can the while in then during sweep signal activation (enable) or received a plurality of data-signals that corresponding driving circuit sends in proper order.
During practical application; Usually first driving circuit 415 and a sensing circuit 215 ' are integrated into same chip 410; And second driving circuit 425 and a sensing circuit 215 are integrated into another chip 420; And controller 130, chip 410,420 can be located on the first substrate 280a or the second substrate 270a, perhaps is located at the outside of substrate 280a.The output terminal that sensing circuit 215 ' is connected to the output buffer 651 of first driving circuit 415 reaches the respectively tie point of first signal wire; With the touch sensing that carries out first signal wire (shown in Fig. 6 B; But must replace the source electrode drive circuit 110 among original figure with first driving circuit 415); And sensing circuit 215 is connected to output terminal and the tie point of each secondary signal line of the output buffer 651 of second driving circuit 425; With the touch sensing (shown in Fig. 6 A, but must replace the gate driver circuit 120 among original figure) that carries out the secondary signal line with second driving circuit 425.Sensing circuit 215,215 ' circuit are identical, will introduce at Fig. 6 A to Fig. 6 C and Fig. 7 A to Fig. 7 H as for sensing circuit 215,215 ' detailed operation mode.
Fig. 5 A is the cross-sectional view of 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 shows signal layer, controller, first driving and sensing circuit and second driving and sensing circuit.With reference to figure 5A and Fig. 5 B, the structure of passive matrix type touching display device 500 of the present invention from user's direction is respectively from top to bottom: the first substrate 280a, liquid crystal layer 150, the second substrate 270a and backlight module 160.
The top (on the surface near the user) that the below of the first substrate 280a (on the surface away from the user) is provided with one first signals layer, 480, the first substrate 280a is provided with a polaroid 183.More form an antireflection film and a cloudy surface antiglare film (figure does not show) on the polaroid 183.Antireflection film is in order to prevent light reflection, and the cloudy surface antiglare film then in order to prevent dazzle, certainly, is considered based on cost, can plated film or only plate antireflection film and the one of which of cloudy surface antiglare film.Second substrate 270a top (on the surface near the user) is provided with 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) is provided with a polaroid 173.Backlight module 160 is the bottom that is positioned at passive matrix type touching display device 500.Because first signal wire S1a～S1c, secondary signal line S2a～S2c, controller 130, first drive and sensing circuit 410 and second drives and circuit framework and Fig. 4 B of sensing circuit 420 are identical among Fig. 5 B, at this not in giving unnecessary details.
In another embodiment, colored filter 171 is to be located on first signals layer 480 of the first substrate 280a, shown in Fig. 5 C.Certainly, when needing monochromatic the demonstration, just need not to be provided with colored filter 171 as if 500 of passive matrix type touching display device.It is noted that because the reaction velocity of liquid crystal is slower, passive-matrix structure 500,500 ' needs first driving circuit 415 and second driving circuit 425 to see the higher voltage value off, and liquid crystal is rotated.
Fig. 6 A shows the circuit framework figure of one of gate 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 terminals of a little output buffers 651, detectable signal is fed into a corresponding sweep trace.For example; When the array base palte 280 above the finger touches sweep trace G1; Though sweep trace G1 and the finger between have one deck array base palte 280 to be separated by, sweep trace G1 still can respond to touching in one's hands, this be because the present invention utilize a CF detectable signal such as: frequency is that 100KHz, amplitude are the square wave detectable signal of 5V; Make between finger and the sweep trace G1 and produce capacitance coupling effect (capacitance coupling, its equiva lent impedance Z cBe equivalent to " 1/jwC f", C wherein fBe the capacitive coupling value; W is a 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 when detecting voltage is higher or lower than the ambient voltage value, produce leakage current (leakage current) and flow to environment via human body.The touching that the present invention comes sensing finger through the mode of detecting human body leakage current, and the equivalent electrical circuit of human body is made up of capacitor C b and resistance R b.As for, among Fig. 4 B the present invention second drive and the circuit framework of sensing circuit 420 identical with gate driving and sensing circuit 220, only need replace to second driving circuit 425 with gate driver circuit 120, at this not in giving unnecessary details.
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 terminals of a little output buffers 651, detectable signal is fed into a corresponding data line.As for, among Fig. 4 B the present invention first drive and the circuit framework of sensing circuit 410 identical with source drive and sensing circuit 210, only need replace to first driving circuit 415 with source electrode drive circuit 110, at this not in giving unnecessary details.
On the other hand; Among Fig. 6 A and Fig. 6 B embodiment; Though gate driving and sensing circuit 220 and source drive and sensing circuit 210 (or first driving and sensing circuit 410 and second driving and sensing circuit 420) only comprise a sensing circuit respectively, the present invention does not limit the sensing circuit number of (215 or 215 '), and in general the number of sensing circuit is many more; It is high more to measure efficient, but hardware cost is also high more.Certainly, source electrode drive circuit 110 and gate driver circuit 120 (or first driving circuit 415 and second driving circuit 425) also can shared same sensing circuits, and hardware cost is minimum, but the time that has measured once to be spent can be at most.Circuit designers can average out between hardware cost and measurement efficient according to application demand.
Among 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, whether finger touch arranged with decision.Below being convenient explanation, is that to measure sweep trace with sensing circuit be example, cooperates Fig. 6 C, Fig. 7 A to Fig. 7 H to specify all embodiment of sensing circuit of the present invention.Function mode as for come the detecting data line with sensing circuit is also identical, repeats no more.
Fig. 7 A shows the circuit framework figure of 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 be simultaneously with reference to figure 6A, in the present embodiment, waveform generator 711 is according to a fixed frequency f1, at each section measurement time (measure time) t mIn, (=1/f1) digital signal m, voltage driver 712 produces a fixed cycle T according to digital signal m, and (=1/f1) a class ratio detection signal a sees through resistance R to produce a fixed cycle T ZAnd multiplexer 630, be transferred to all sweep trace G1～Gn in regular turn, to carry out the measurement of fixed cycle signal.Input impedance (impedance) is high because impact damper 713 has, the low characteristic of output impedance; Impact damper 713 is in order 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 influence 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, so the relation that (gain) equals 1 because impact damper 713 itself gains is 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 signal acquisition and handle, to produce a measuring value D.
When supposing that finger is not touched the present invention and touched display device, V QEqual V Mod, when finger touches the present invention touched display device (for example touching the upper surface of array base palte 280), the whole piece loop was owing to the process human body produces 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 ModBe the amplitude size of detectable signal a, w=2 π f1 is the frequency of detectable signal a, C fBe the coupling capacitance between human finger and sweep trace, the equivalent electrical circuit of human body is by capacitor C bAnd resistance R bForm.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 InOutput voltage V when amplitude is not touched less than finger InAmplitude.Signal acquisition device 714 utilizes detectable signal a to induced voltage V InWhen 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 mApparently, when finger was not touched, measuring value D can be bigger; And when finger touches the present invention touched display device, measuring value D can be less.Aspect circuit control; Controller 130 can be known usually and will detect a particular scan (like G1) and send control signal CS1; So that multiplexer 630 is connected to sweep trace G1 with end points Q, can judge according to measuring value D size whether sweep trace G1 has finger touches again.Mode according to this after controller 130 has been collected the corresponding measuring value D of all sweep traces in regular turn, is touched display device if finger has touched the present invention in fact, just can with the correct position of finger touches locate out.
When Fig. 8 shows signal acquisition device carries out the signal acquisition processing, the synoptic 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, if induced voltage V with the frequency f of detectable signal a 1 InThe signal that is comprised or the frequency of noise are greater than or less than this frequency f 1, and 714 of signal acquisition devices carry out the signal acquisition processing will make its positive negative term disappear mutually, and to not contribution of last measuring value D.For example, the dc noise of the top is (1,1,1 among Fig. 8; 1,1,1), the sequence of detectable signal a is (1;-1,1 ,-1; 1 ,-1), 714 of signal acquisition devices carry out signal acquisition handle system each corresponding voltage of dc noise and detectable signal a is multiplied each other after addition again; And the sign of each corresponding voltage of dc noise and detectable signal a after multiplying each other is shown in the sign under the 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 is (1 ,-1,1;-1,1 ,-1); Because identical with the sequence of detectable signal a, based on the orthogonality characteristic of signal, signal acquisition device 714 carries out after signal acquisition handles (addition again after this each corresponding voltage with signal and detectable signal a of frequency f 1 is multiplied each other); Can not produce the effect that positive negative term disappears mutually, so can obtain measuring value D=1*1+ (1) * (1)+1*1+ (1) * (1)+1*1+ (1) * (1)=6 of non-zero.Orthogonality characteristic based on signal; 714 of signal acquisition devices can take out signal and the noise identical with the frequency f of detectable signal a 1; Be equivalent to restituted signal and filter the noise (like low-frequency noise, 60Hz noise, 1/f noise etc.) of most of wave band; So present embodiment can be avoided interference of noise (noise interference), the touching of correct response finger.
Fig. 7 B shows the circuit framework figure of second embodiment of sensing circuit of the present invention.Only be with the difference of first embodiment; So the signal acquisition device of first embodiment 714 is the analogous circuit impact damper 713 of arranging in pairs or groups, so and the signal acquisition device 714 of 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 received the digital signal bin of analogy digital quantizer 715 generations, when utilizing digital signal m that digital signal bin is carried out the signal acquisition processing, the action of itself was 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.Likewise, when finger was not touched, measuring value D can be bigger; And when finger touches the present invention touched 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.Present embodiment can be avoided 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.Be that with the difference of first embodiment sensor circuit 620C comprises a BPF. (band-pass filter) 731, one r.m.s. (root mean square) circuit 732 and an element 733.When BPF. 731 and r.m.s. circuit 732 were digital circuit, element 733 was an analogy digital quantizer; When BPF. 731 and r.m.s. circuit 732 were analogous circuit, element 733 was an impact damper.The frequency (fixed frequency f1) of the frequency central point of BPF. 731 and detectable signal a is identical; BPF. 731 receiving inputted signal in are with the noise beyond the filtering centre frequency f1; Get its root-mean-square valve behind the output signal of r.m.s. circuit 732 reception bandpass filters 731, with generation measured value D.Identical with first embodiment and second embodiment, when finger was not touched, measuring value D can big (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, measuring value D can be less after dividing potential drop.Because present embodiment is provided with BPF. 731, so present embodiment can be avoided 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.Be that with the difference of the 3rd embodiment sensor circuit 620D does not comprise BPF. 731.Advantage is that design cost is lower, and the shortcoming irresistible The noise that is circuit.
Fig. 7 E shows the circuit framework figure of the 5th embodiment of sensing circuit of the present invention.Be that with the difference of first embodiment voltage driver 712 ' of detection circuit 610 ' measures time t in each section mIn, be according to digital signal m produce a fixed cycle T (=1/f1) two altogether (common ground) positive anti-phase square-wave signal a,
Figure BDA0000030071410000142
See through resistance R again 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 is connected to two adjacent scanning lines Gn-1, Gn according to the control signal CS1 of controller 130 generations with end points Q+, Q-, and differential amplifier 742 receives induced voltage V Q+And induced voltage V Q-To produce induced voltage V InThe present invention system utilizes differential amplifier 742 to have the characteristic that common-mode noise suppresses ability (commonmode noise rejection); If there is a low-frequency noise respectively two positive-negative input ends of differential amplifier 742 to be caused noise, can be because positive negative disappears and can not be reflected at output terminal.Above-mentioned detection circuit 610 ' produces two positive inversion signal a, altogether 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.Present embodiment can be avoided interference of noise, the touching of correct response finger.
Fig. 9 A is the embodiment according to Fig. 7 E, does not touch under the situation that the present invention touches display device the rough schematic of circuit at finger.With reference to figure 9A; When finger is not touched; The output waveform of differential amplifier 742 is consistent with the cycle of detectable signal a,
Figure BDA0000030071410000152
, and the expression 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 was sensed finger touches simultaneously, two sweep traces produced 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 InSignal amplitude (shown in Fig. 9 A) when amplitude is not touched less than finger.Comparison diagram 9A and Fig. 9 B can observe; The output waveform of differential amplifier 742 is consistent with the cycle of detectable signal a,
Figure BDA0000030071410000153
, but voltage amplitude diminishes.
Fig. 9 C is the embodiment according to Fig. 7 E, when having only 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 was sensed finger touches, this sweep trace produced 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 InSignal amplitude (shown in Fig. 9 A) when amplitude is not touched less than finger.At this moment; The output waveform of differential amplifier 742 is consistent with the cycle of detectable signal a,
Figure BDA0000030071410000154
, but voltage amplitude diminishes.Comparison diagram 9A to Fig. 9 C can observe, the output voltage V when having only a sweep trace to sense finger touches In3Output voltage V when amplitude is not touched less than finger In1Signal amplitude, but the output voltage V when sensing finger touches simultaneously greater than two sweep traces In2Amplitude.During practical application, no matter have only a sweep trace or two sweep traces to sense finger touches simultaneously, the output voltage V of differential amplifier 742 InAmplitude can dwindle equally, and the measuring value D that the signal acquisition device 741 of level is exported after causing also can dwindle (when 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.Be that with the difference of second embodiment present embodiment is a differential architecture.Present embodiment can be avoided 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 a plurality of frequencies of combination at random, at each section measurement time (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.Likewise, in the 5th and the 6th embodiment of sensing circuit, when measuring each time, waveform generator 711 can also be according to a plurality of frequencies of combination at random, at each section measurement time (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) positive anti-phase square-wave signal a,
Figure BDA0000030071410000161
Because the frequency that makes up at random when measuring each time is all different, so circuit can not receive the interference of a certain CF.Be noted that; Fig. 8 is presented at the signal acquisition device and carries out signal acquisition when handling, and the noise of different frequency can produce the effect that positive negative term disappears mutually, is not only applicable to the measurement method of fixed cycle signal; Also be applicable to the measurement method of on-fixed cycle (a plurality of frequency of combination at random) signal; The two 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.Be that with the difference of the 3rd embodiment present embodiment is a differential architecture.Sensor circuit 620G comprises a differential amplifier 742, an analogy digital quantizer 715, a BPF. 731 and r.m.s. circuit 732.Wherein, when BPF. 731 and r.m.s. circuit 732 are digital circuit, just analogy digital quantizer 715 need be set; When BPF. 731 and r.m.s. circuit 732 are analogous circuit, must cast out analogy digital quantizer 715.Because therefore analogy digital quantizer 715 and inessential element are represented by dotted lines in the drawings.Because present embodiment is provided with BPF. 731, so present embodiment can be avoided 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.Be that with the difference of the 4th embodiment present embodiment is a 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.Because therefore analogy digital quantizer 715 and inessential element are represented by dotted lines in the drawings.
It is noted that; Detectable signal a among above-mentioned Fig. 7 A to Fig. 7 H or can also implement by a sine wave during practical application though all explain with square wave.
Fig. 6 C is the embodiment according to Fig. 6 A, when three sweep traces are formed an induction channels, and the rough schematic of circuit.The coupling capacitance C of finger fBe about 1pF, for the intensity of the induced signal strengthening pointing, can many adjacent scanning lines be formed induction channels (sensing channel), this measure is equivalent to strengthen the contact area between lead and the finger, 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 first induction channels ch1, then 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, the bar adjacent data line also can be formed an induction channels more than among Fig. 6 B.
Because it is to utilize sweep trace and data line to come show image and detecting finger touch that the present invention touches display device, the detecting action that important prerequisite is a finger touch can not influence picture and show.To be sensing circuit of the present invention point three kinds of different modes of sensing to sweep trace to Figure 10 A to Figure 10 C, and the square wave among the figure representes that corresponding sweep trace is in during the show image, and the string wave table shows that corresponding scanning linear system is in during the finger sensing.
(vertical blanking) carried out the finger touches sensing during Figure 10 A represented mainly to utilize vertical blank; And for fear of producing cross-talk (crosstalk) between adjacent scanning lines; Carry out the delegation of being separated by at least between the sweep trace of touch sensing; Certainly, the sweep trace G1, G3, the G5...Gn that carry out touch sensing simultaneously must be connected to different sensing circuits, otherwise system can't be with finger locating.This pattern of note that also is applicable to that sensing circuit of the present invention points sensing to data line.
Figure 10 B representes that another sweep trace can be pointed sensing when a certain sweep trace is in show state, but must use antimierophonic sensing circuit (i.e. first to the 3rd embodiment and the 5th to the 7th embodiment), to avoid receiving the interference of shows signal.Certainly, it is good more far more that the sweep trace that carries out the image scan lines displayed and carry out touch sensing is separated by, to avoid the phase mutual interference.The similar Figure 10 B of Figure 10 C; Expression is when a certain sweep trace is in show state, and other multi-strip scanning lines can carry out touch sensing simultaneously, the delegation but the sweep trace that carries out touch sensing simultaneously must be separated by at least; To avoid producing cross-talk (crosstalk) between adjacent scanning lines; And the sweep trace that carries out touch sensing simultaneously must be connected to different sensing circuits, otherwise system can't be with finger locating.
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 touch sensing.In addition, influence picture for fear of the touch sensing action and show, in the active matrix drive mode, must note avoiding detectable signal a thin film transistor (TFT) conducting (V Gs＞0), and then influence 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 be lower than the magnitude of voltage of the detectable signal a of sensing circuit feed-in data line, and make V Gs＜0, mislead to avoid thin film transistor (TFT) 115.
In sum; The present invention is by the position turned upside down with relative substrate and array base palte; Make the array base palte 280 that comprises data line and sweep trace be positioned at top (near one of user side), and 270 of the relative substrates at public electrode 172 place 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 human body leakage current is come the touching of correct finger sensing.Need not add the touching device; The present invention utilizes the active matrix drive structure or the original passive-matrix Drive Structure of turned upside down; Cooperate the characteristic and the design of antimierophonic sensing circuit of human body conductor; Touching and the circuit design that shows are integrated, and the function of processes and displays and multi-point touch reduces hardware cost and saves the energy simultaneously.
Though more than with embodiment the present invention is described, therefore do not 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 formula is touched display device, it is characterized in that described device comprises:
Array basal plate; On its surface, be provided with a signals layer, comprise many data lines and multi-strip scanning line away from the user; Each confluce of wherein said data line and described sweep trace disposes a pixel cell respectively, and each pixel cell is provided with one and switches an element and a pixel electrode;
One relative substrate, parallel with respect to described array base palte and be positioned at a side away from the user;
One public electrode with respect to described pixel electrode, is located on the surface near the user of described relative substrate;
One display material is sandwiched between described array base palte and the described relative substrate;
One gate driver circuit, the pixel cell that connected of each described sweep trace of activation wherein, forms a plurality of first tie points between the output terminal of described gate driver circuit and described sweep trace in regular turn;
The one source pole driving circuit provides a plurality of data-signals, and exports corresponding pixel cell to via described data line, wherein, forms a plurality of second tie points between the output terminal of described source electrode drive circuit and described data line;
At least one sensing circuit carries out touch sensing in order to the one of which at least to described data line and described sweep trace, and each sensing circuit comprises:
One detection circuit according at least one frequency, produces a detectable signal to export the one of which at least of described first tie point and described second tie point to; And
One sensor circuit receives at least one output signal of corresponding tie point, carries out signal acquisition and handles, to produce a measuring value; And
One controller is in order to control described source electrode drive circuit, described gate driver circuit and described at least one sensing circuit.
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, one fixedly in the measurement time, produces a digital signal; And
One voltage driver according to described digital signal, produces described detectable signal.
3. touching display device as claimed in claim 1; It is characterized in that; Wherein, During a picture shows and the one of which of described sweep trace be when being in show state, described sensing circuit carries out touch sensing to the one of which at least of non-conterminous described sweep trace in the described sweep trace that is in show state.
4. touching display device as claimed in claim 3; It is characterized in that; Wherein when the described sweep trace that carries out touch sensing simultaneously is connected to different sensing circuit; It is non-conterminous carrying out between each described sweep trace of touch sensing, and 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 BPF., in order to according to a frequency filtering, the one of which at least of described output signal carried out Filtering Processing after, produce a filtering signal; And
One r.m.s. circuit receives 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 receives the one of which at least of described output signal, according to described detectable signal, carries out signal acquisition and handles, to produce described measuring value;
Wherein, described at least one frequency is a fixed frequency or a plurality of frequency of combination at random.
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 receives the two of described output signal, in order to the filters low noise, to produce an induced signal;
One BPF., in order to according to a frequency filtering, described induced signal carried out Filtering Processing after, produce a filtering signal; And
One r.m.s. circuit receives 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 receives the two of described output signal, in order to the filters low noise, to produce an induced signal; And
One signal acquisition device receives described induced signal, according to described detectable signal, carries out signal acquisition and handles, to produce described measuring value;
Wherein, described at least one frequency is a fixed frequency or a plurality of frequency of combination at random.
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 to the one of which at least 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 carries out touch sensing simultaneously is connected to different sensing circuit; It is non-conterminous carrying out between each described sweep trace of touch sensing, and 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 carrying out touch sensing simultaneously is connected to different sensing circuit; It is non-conterminous carrying out between each described data line of touch sensing, and 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 receives 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 comprised two altogether positive phase signals and reverse signals, described sensor circuit more comprised a differential amplifier; It is the front stage circuits of described r.m.s. circuit; Receive both of described output signal,, produce an induced signal to be sent to described r.m.s. circuit in order to the filters low noise.
15. touching display device as claimed in claim 1 is characterized in that, described display material is one of a plurality of microcapsules, a plurality of EL part and liquid crystal person.
16. touching display device as claimed in claim 15, wherein when described display material was liquid crystal, described touching display device more comprised:
One first polaroid is located on the surface near the user of described array base palte;
One second polaroid is located on the surface away from the user of described relative substrate;
One colored filter, be located at described relative substrate near the user the surface and described public electrode between or on the described signals layer; And
One backlight module is 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 when being a color monitor; Described touching display device more comprises a colored filter, be located at described relative substrate near the user the surface and described public electrode between or on the described signals layer.
18. touching display device as claimed in claim 15; It is characterized in that; Wherein when described display material was described EL part, described EL part was the one of which of 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 system that wherein is fed into the detectable signal of described first tie point is lower than the magnitude of voltage of the detectable signal that is fed into described second tie point.
20. touching display device as claimed in claim 1 is characterized in that, wherein; When carrying out touch sensing each time; Each described sensing circuit is respectively an induction channels to be carried out 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 which 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, is provided with one first signals layer, comprises many first signal wires;
One second substrate; Parallel with respect to described first substrate and be located at a side away from the user; On the surface near the user of described second substrate; Be provided with a secondary signal layer, comprise many secondary signal lines, interlaced arrangement between wherein said first signal wire and described secondary signal;
One display material is sandwiched between described first substrate and described second substrate;
One first driving circuit in order to supply at least one first voltage signal to described first signal wire, wherein, forms a plurality of first tie points between the output terminal of described first driving circuit and described first signal wire;
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 second driving circuit and described secondary signal line form a plurality of second tie points;
At least one sensing circuit carries out touch sensing in order to the one of which at least to described first signal wire and described secondary signal line, and each sensing circuit comprises:
One detection circuit according at least one frequency, produces a detectable signal to export the one of which at least of described first tie point and described second tie point to; And
One sensor circuit receives at least one output signal of corresponding tie point, carries out signal acquisition and handles, to produce a measuring value; And
One controller is in order to control described first driving circuit, described second driving circuit and described at least one sensing circuit.
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, one fixedly in the measurement time, produces a digital signal; And
One voltage driver according to described digital signal, produces 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 an 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, and 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, During a picture shows and the one of which of described sweep trace when being in show state, described sensing circuit is that the one of which at least to non-conterminous described sweep trace in the described sweep trace that is in show state carries out touch sensing.
27. touching display device as claimed in claim 26; It is characterized in that; Wherein when the described scanning linear system of carrying out touch sensing simultaneously is connected to different sensing circuit; It is non-conterminous carrying out between each described sweep trace of touch sensing, and when the described scanning linear system of carrying out touch sensing was connected to same sensing circuit, it was 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 BPF., in order to according to a frequency filtering, the one of which at least of described output signal carried out Filtering Processing after, produce a filtering signal; And
One r.m.s. circuit receives 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 receives the one of which at least of described output signal, according to described detectable signal, carries out signal acquisition and handles, to produce described measuring value;
Wherein, described at least one frequency is a fixed frequency or a plurality of frequency of combination at random.
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 receives the two in the described output signal, in order to the filters low noise, to produce an induced signal;
One BPF., in order to according to a frequency filtering, described induced signal carried out Filtering Processing after, produce a filtering signal; And
One r.m.s. circuit receives 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 receives the two in the described output signal, in order to the filters low noise, to produce an induced signal; And
One signal acquisition device receives described induced signal, according to described detectable signal, carries out signal acquisition and handles, to produce described measuring value;
Wherein, described at least one frequency is a fixed frequency or a plurality of frequency of combination at random.
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 to the one of which at least of described first signal wire 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 carrying out touch sensing simultaneously is connected to different sensing circuit; It is non-conterminous carrying out between each described first signal wire of touch sensing, and 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 wire 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 carrying out touch sensing simultaneously is connected to different sensing circuit; It is non-conterminous carrying out between each described secondary signal line of touch sensing, and 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 receives the one of which at least 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 comprised two altogether positive phase signals and reverse signals, described sensor circuit more comprised a differential amplifier; It is the front stage circuits of described r.m.s. circuit; Receive the two in the described output signal,, produce an induced signal to be sent to described r.m.s. circuit in order to the filters low noise.
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 the liquid crystal.
39. touching display device as claimed in claim 23 is characterized in that, wherein when described display material was liquid crystal, described touching display device more comprised:
One first polaroid is located on the surface near user's eyes of described first substrate;
One second polaroid is located on the surface away from user's eyes of described second substrate;
One colored filter is located on described first signals layer or on the described secondary signal layer; And
One backlight module is 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 when being a color monitor; Described touching display device more comprises a colored filter, is located on described first signals layer or on the 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 the polymer LED.
42. touching display device as claimed in claim 23; It is characterized in that; Wherein, when carrying out touch sensing each time, each described sensing circuit is respectively an induction channels to be carried out 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 the material of described first substrate and described second substrate is a kind of in plastic cement, glass and the thin metal.
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