CN101609220B - Liquid crystal display device with induction mechanism and induction locating method thereof - Google Patents
Liquid crystal display device with induction mechanism and induction locating method thereof Download PDFInfo
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- CN101609220B CN101609220B CN2009101610244A CN200910161024A CN101609220B CN 101609220 B CN101609220 B CN 101609220B CN 2009101610244 A CN2009101610244 A CN 2009101610244A CN 200910161024 A CN200910161024 A CN 200910161024A CN 101609220 B CN101609220 B CN 101609220B
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Abstract
The invention provides a liquid crystal display device with an induction mechanism and an induction locating method thereof. The liquid crystal display device comprises a data wire, an induction unit, a pixel unit, a first gate line, a second gate line, a source driver, a readout signal processing unit and a switch unit. The data wire is used for transmitting a data signal or reading a signal. The induction unit is used for generating a readout signal. The pixel unit is used for controlling the pixel brightness according to the data signal. The first gate line is used for transmitting a first gate signal to control the induction unit. The second gate line is used for transmitting a second gate signal to control the pixel unit. The source driver is used for providing the data signal. The readout signal processing unit is used for receiving the readout signal to execute induction position analysis. The switch unit is used for electrically connecting with the source driver and the data wire, or with the readout signal processing unit and the data wire. The invention can avoid the aperture ratio of shrinkage pixel and the interference to the analog voltage of the data signal by the transmission of the readout signal.
Description
Technical field
The present invention refers to a kind of liquid crystal indicator and its induction locating method of tool induction mechanism especially relevant for a kind of liquid crystal indicator.
Background technology
Liquid crystal indicator (Liquid Crystal Display; LCD) have that external form is frivolous, power saving and advantage such as radiationless, therefore be widely used on the electronic products such as multimedia player, mobile phone, PDA(Personal Digital Assistant), computer monitor or flat-surface television.In addition, the function of utilizing liquid crystal indicator to carry out photoinduction formula or touching induction type input running also gradually becomes popular, that is more and more electronic products make the liquid crystal indicator of apparatus induction mechanism as its input interface.
Fig. 1 is the structural representation of the liquid crystal indicator of existing tool induction mechanism.As shown in Figure 1, liquid crystal indicator 100 comprises source electrode driver 110, gamma voltage generator 105, gate drivers 120, sensing circuit 195 and image viewing area 190.Image viewing area 190 comprises a plurality of data lines 130, a plurality of sense wire 140, a plurality of gate line 150, a plurality of pixel cell 160 and a plurality of sensing unit 170.Source electrode driver 110 comprises a plurality of digital/analog converters 115, a plurality of gamma voltages of being provided according to gamma voltage generator 105 are provided, digital image data is converted to a plurality of data-signals, write to a plurality of pixel cells 160 via a plurality of data lines 130, and each pixel cell 160 promptly according to the data-signal that is received with control pixel intensity.Gate drivers 120 provides a plurality of signals, is fed into a plurality of pixel cells 160 and a plurality of sensing units 170 via a plurality of gate lines 150.A plurality of sensing units 170 are carried out the induction running to produce a plurality of read output signals, transfer to sensing circuit 195 via a plurality of sense wires 140.Yet in the structure of liquid crystal indicator 100, because the setting of a plurality of sense wires 140, so pixel aperture ratio (ApertureRatio) meeting thereby dwindle.In addition, the read output signal of a plurality of sense wires 140 transmission, data-signal that then can interfering data line 130 makes the aanalogvoltage drift of data-signal and reduces image display quality.
Summary of the invention
According to embodiments of the invention, it discloses a kind of liquid crystal indicator of tool induction mechanism.This kind liquid crystal indicator comprises data line, sensing unit, pixel cell, first grid polar curve, second grid line, source electrode driver, readout signal processing unit and switch element.Data line is in order to transmission of data signals or read output signal.Sensing unit is electrically connected on data line with the output read output signal.Pixel cell is electrically connected on data line to receive data-signal.First grid polar curve is electrically connected on sensing unit, is used for transmitting the first grid signal with the control sensing unit.The second grid line is electrically connected on pixel cell, is used for transmitting the second grid signal with the control pixel cell.Source electrode driver is in order to provide data-signal.Readout signal processing unit is in order to carry out the signal Processing of read output signal.Switch element comprises first end, second end and the 3rd end, wherein first end is electrically connected on source electrode driver, second end is electrically connected on readout signal processing unit, the 3rd end is electrically connected on data line, switch element is used for enabling the electric connection of first end and the 3rd end, or enables the electric connection of second end and the 3rd end.
According to embodiments of the invention, it discloses a kind of induction locating method in addition, and this method comprises: a liquid crystal indicator is provided, and this liquid crystal indicator comprises data line; First grid polar curve; The second grid line; Sensing unit is electrically connected on this data line and this first grid polar curve; Pixel cell is electrically connected on this data line and this second grid line; Source electrode driver; Readout signal processing unit; And switch element, it comprises first end, second end and the 3rd end, and wherein first end is electrically connected on source electrode driver, and second end is electrically connected on readout signal processing unit, and the 3rd end is electrically connected on data line; In first period, switch element is electrically connected second end and the 3rd end, in order to be electrically connected readout signal processing unit and data line; In first period, first grid polar curve transmission first grid signal is to enable sensing unit output read output signal to readout signal processing unit; In second period, switch element is electrically connected first end and the 3rd end, in order to be electrically connected source electrode driver and data line; In second period, second grid line transmission second grid signal receives the data-signal of being exported by source electrode driver to enable pixel cell; And in the 3rd period, readout signal processing unit is carried out the sensed position analysis of read output signal; Wherein first period and second period do not overlap each other.
Description of drawings
Fig. 1 is the structural representation of the liquid crystal indicator of existing tool induction mechanism;
Fig. 2 is the structural representation of the liquid crystal indicator of first embodiment of the invention;
Fig. 3 is the work coherent signal oscillogram of the liquid crystal indicator of Fig. 2, and wherein transverse axis is a time shaft;
Fig. 4 is the structural representation of the liquid crystal indicator of second embodiment of the invention;
Fig. 5 is the structural representation of the liquid crystal indicator of third embodiment of the invention;
Fig. 6 is used for the induction locating method process flow diagram of liquid crystal indicator shown in Figure 2 for the present invention.
Drawing reference numeral:
100,200,400,500 liquid crystal indicators
105,205 gamma voltage generators
110,210 source electrode drivers
115,215 digital/analog converters
120,220 gate drivers
130,230 data lines
140 sense wires
150 gate lines
160,260,460 pixel cells
170,270,470,570 sensing units
190,290 image viewing areas
195 sensing circuits
251 first grid polar curves
252 second grid lines
280 switch elements
295 readout signal processing unit
461 data switches
463 liquid crystal capacitances
465 second storage capacitors
471,571 read transistor
473,573 first storage capacitors
477,577 induction transistors
575 the 3rd storage capacitors
DLm, DLm+1 data line
SDm, SDm+1 data-signal
SG1_n-1～SG1_n+1 first grid signal
SG2_n-1～SG2_n+1 second grid signal
SUm_n-1～SUm+1_n+1 sensing unit
Pm_n-1～Pm+1_n+1 pixel cell
SWm, SWm+1 switch element
T11, T12, first period of T13
T21, T22, second period of T23
The Vcom common voltage
Vg first bias voltage
The pressure drop of Vgs grid source electrode
Vs second bias voltage
Embodiment
Hereinafter according to liquid crystal indicator and its induction locating method of tool induction mechanism of the present invention, cooperate appended graphic elaborating especially exemplified by embodiment, but the technical scope that the embodiment that is provided is not contained in order to restriction the present invention, carry out precedence and the method flow number of steps is more non-in order to limit it, any execution flow process that reconfigures by method step, the method with impartial effect that produces is all the technical scope that the present invention is contained.
Fig. 2 is the structural representation of the liquid crystal indicator of first embodiment of the invention.As shown in Figure 2, liquid crystal indicator 200 comprises source electrode driver 210, gamma voltage generator 205, gate drivers 220, readout signal processing unit 295, a plurality of switch element 280 and image viewing area 290.Image viewing area 290 comprises a plurality of data lines 230, a plurality of first grid polar curve 251, a plurality of second grid line 252, a plurality of pixel cell 260 and a plurality of sensing unit 270.Gate drivers 220 is electrically connected on a plurality of first grid polar curves 251 and a plurality of second grid lines 252, be used to provide a plurality of first grid signals and be fed into a plurality of sensing units 270, and be used to provide a plurality of second grid signals and be fed into a plurality of pixel cells 260 via a plurality of second grid lines 252 via a plurality of first grid polar curves 251.Source electrode driver 210 comprises a plurality of digital/analog converters 215, a plurality of gamma voltages of being provided according to gamma voltage generator 205 are provided, digital image data is converted to a plurality of data-signals, write to a plurality of pixel cells 260 via a plurality of data lines 230, and each pixel cell 260 promptly according to the data-signal that is received with control pixel intensity.A plurality of sensing units 270 are carried out the induction running to produce a plurality of read output signals, transfer to readout signal processing unit 295 via a plurality of data lines 230.In one embodiment, readout signal processing unit 295 can be supplied to the charging current of each sensing unit 270 to capture corresponding read output signal by detection.
A plurality of read output signals that 295 pairs of readout signal processing unit are received are carried out the sensed position analysis, in order to the location sensed position.Each switch element 280 is used for respective data lines 230 is electrically connected to readout signal processing unit 295, or respective data lines 230 is electrically connected to source electrode driver 210.For example, when switch element SWm is electrically connected data line DLm and readout signal processing unit 295, and when first grid signal SG1_n is enable signal, the read output signal that sensing unit SUm_n produced can be via data line DLm and switch element SWm and is transferred to readout signal processing unit 295, and then the sensed position analysis by readout signal processing unit 295, judge whether the positions of panels corresponding to sensing unit SUm_n sense events takes place.Perhaps, when switch element SWm+1 is electrically connected data line DLm+1 and source electrode driver 210, and when second grid signal SG2_n is enable signal, the data-signal that the corresponding digital/analog converter 215 of source electrode driver 210 is exported can be via switch element SWm+1 and data line DLm+1 and write to pixel cell Pm+1_n.In the embodiment shown in Figure 2, switch element 280 comprises first end, second end and the 3rd end, wherein first end is electrically connected on source electrode driver 210, second end is electrically connected on readout signal processing unit 295, the 3rd end is electrically connected on data line 230, so switch element 280 is used for enabling the electric connection of first end and the 3rd end, or the electric connection of second end and the 3rd end.
In another embodiment, sensing unit 270 is a plurality of data lines 230 and being provided with at interval, or a plurality of second grid lines 252 and being provided with at interval, that is are not that each pixel cell 260 is all adjacent with sensing unit 270.In like manner, first grid polar curve 251 can be accordingly a plurality of second grid lines 252 and being provided with at interval.From the above, in the circuit structure of liquid crystal indicator 200, the read output signal of each sensing unit 270 transfers to readout signal processing unit 295 via respective data lines 230, do not need to be provided with in addition sense wire, so can avoid aperture ratio of shrinkage pixel, in addition, because of read output signal and data-signal can not transmit simultaneously, so can avoid the aanalogvoltage of data-signal disturbed by the read output signal transmission.
Fig. 3 is the work coherent signal oscillogram of the liquid crystal indicator of Fig. 2, and wherein transverse axis is a time shaft.In Fig. 3, basipetal signal is respectively first grid signal SG1_n-1, second grid signal SG2_n-1, first grid signal SG1_n, second grid signal SG2_n, first grid signal SG1_n+1 and second grid signal SG2_n+1.As shown in Figure 3, in the first period T11, first grid signal SG1_n-1 is the enable signal of high levle, is used for enabling sensing unit SUm_n-1 and SUm+1_n-1 output read output signal.At this moment, switch element SWm is electrically connected data line DLm and readout signal processing unit 295, and switch element SWm+1 is electrically connected data line DLm+1 and readout signal processing unit 295.So, the read output signal that sensing unit SUm_n-1 produced can be via data line DLm and switch element SWm and is transferred to readout signal processing unit 295, and the read output signal that sensing unit SUm+1_n-1 produced can be via data line DLm+1 and switch element SWm+1 and is transferred to readout signal processing unit 295, and then readout signal processing unit 295 can be carried out the sensed position analysis according to this.
In the second period T21, second grid signal SG2_n-1 is the enable signal of high levle, is used for enabling pixel cell Pm_n-1 and Pm+1_n-1 and receives data-signal.At this moment, switch element SWm is electrically connected data line DLm and source electrode driver 210, and switch element SWm+1 is electrically connected data line DLm+1 and source electrode driver 210.So, the data-signal SDm that source electrode driver 210 is exported can be via switch element SWm and data line DLm and is write pixel cell Pm_n-1, and the data-signal SDm+1 that source electrode driver 210 is exported can be via switch element SWm+1 and data line DLm+1 and is write pixel cell Pm+1_n-1, and pixel cell Pm_n-1 and Pm+1_n-1 can control respective pixel brightness according to this.In the transition period between the first period T11 and the second period T21, all signals are the decapacitation signal, can be in order to each data line 230 of precharge to corresponding pixel voltage.
In the first period T12, first grid signal SG1_n is the enable signal of high levle, is used for enabling sensing unit SUm_n and SUm+1_n output read output signal.At this moment, switch element SWm is electrically connected data line DLm and readout signal processing unit 295, and switch element SWm+1 is electrically connected data line DLm+1 and readout signal processing unit 295.So, the read output signal that sensing unit SUm_n produced can be via data line DLm and switch element SWm and is transferred to readout signal processing unit 295, and the read output signal that sensing unit SUm+1_n produced can be via data line DLm+1 and switch element SWm+1 and is transferred to readout signal processing unit 295, and then makes readout signal processing unit 295 can carry out the sensed position analysis according to this.In the transition period between the second period T21 and the first period T12, all signals are the decapacitation signal, can be in order to each data line 230 of precharge to the required reset voltage of sensing unit 270.
In the second period T22, second grid signal SG2_n is the enable signal of high levle, is used for enabling pixel cell Pm_n and Pm+1_n and receives data-signal.At this moment, switch element SWm is electrically connected data line DLm and source electrode driver 210, and switch element SWm+1 is electrically connected data line DLm+1 and source electrode driver 210.So, the data-signal SDm that source electrode driver 210 is exported can be via switch element SWm and data line DLm and is write pixel cell Pm_n, and the data-signal SDm+1 that source electrode driver 210 is exported can be via switch element SWm+1 and data line DLm+1 and is write pixel cell Pm+1_n, and pixel cell Pm_n and Pm+1_n can control respective pixel brightness according to this.In like manner, in the transition period between the first period T12 and the second period T22, all signals are the decapacitation signal, can be in order to each data line 230 of precharge to corresponding pixel voltage.In the running of the circuit of the first period T13, the second period T23 and all the other transition periods, can be according to above-mentioned and in like manner analogize, so repeat no more.Note that when readout signal processing unit 295 captures read output signal in each first period after, can carry out the sensed position analysis of read output signal, and in order to the period of carrying out the sensed position analysis can overlap first period, second period or transition period.
Fig. 4 is the structural representation of the liquid crystal indicator of second embodiment of the invention.As shown in Figure 4, liquid crystal indicator 400 is similar to liquid crystal indicator shown in Figure 2 200, and main difference is pixel cell 260 and sensing unit 270 are replaced into pixel cell 460 and sensing unit 470.In the embodiment shown in fig. 4, sensing unit 470 comprises reads transistor 471, first storage capacitors 473 and induction transistor 477, wherein reads transistor 471 and can be thin film transistor (TFT) (Thin Film Transistor) or metal-oxide semiconductor (MOS) (Metal Oxide Semiconductor; MOS) transistor, induction transistor 477 can be the photoinduction thin film transistor (TFT).Pixel cell 460 comprises data switch 461, liquid crystal capacitance 463 and second storage capacitors 465, and wherein data switch 461 can be thin film transistor (TFT) or metal oxide semiconductor transistor.
Read transistor 471 and comprise first end, second end and gate terminal, wherein first end is electrically connected on data line 230, and gate terminal is electrically connected on first grid polar curve 251.First storage capacitors 473 comprises first end and second end, and wherein first end is electrically connected on second end of reading transistor 471, and second end is in order to receive common voltage Vcom.Induction transistor 477 comprises first end, second end and gate terminal, and wherein first end is electrically connected on second end of reading transistor 471, and second end and gate terminal are all in order to receive common voltage Vcom.Data switch 461 comprises first end, second end and gate terminal, and wherein first end is electrically connected on data line 230, and gate terminal is electrically connected on second grid line 252.Liquid crystal capacitance 463 comprises first end and second end, and wherein first end is electrically connected on second end of data switch 461, and second end is in order to receive common voltage Vcom.Second storage capacitors 465 comprises first end and second end, and wherein first end is electrically connected on second end of data switch 461, and second end is in order to receive common voltage Vcom.
Fig. 5 is the structural representation of the liquid crystal indicator of third embodiment of the invention.As shown in Figure 5, liquid crystal indicator 500 is similar to liquid crystal indicator shown in Figure 4 400, and main difference is sensing unit 470 is replaced into sensing unit 570.In the embodiment shown in fig. 5, sensing unit 570 comprises reads transistor 571, first storage capacitors 573, the 3rd storage capacitors 575 and induction transistor 577, wherein read transistor 571 and can be thin film transistor (TFT) or metal oxide semiconductor transistor, induction transistor 577 can be the photoinduction thin film transistor (TFT).
Read transistor 571 and comprise first end, second end and gate terminal, wherein first end is electrically connected on data line 230, and gate terminal is electrically connected on first grid polar curve 251.First storage capacitors 573 comprises first end and second end, and wherein first end is electrically connected on second end of reading transistor 571, and second end is in order to receive the first bias voltage Vg.Induction transistor 577 comprises first end, second end and gate terminal, and wherein first end is electrically connected on second end of reading transistor 571, and gate terminal is in order to receive the first bias voltage Vg, and second end is in order to receive the second bias voltage Vs.The 3rd storage capacitors 575 is electrically connected between first end and second end of induction transistor 577.The first bias voltage Vg and the second bias voltage Vs can be in order to set the grid source electrode pressure drop Vgs of induction transistor 577, so the leakage current of the induction transistor 577 of flowing through is adjustable to control the velocity of discharge of first storage capacitors 573 and the 3rd storage capacitors 575.In one embodiment, the first bias voltage Vg can be common voltage Vcom, and grid source electrode pressure drop Vgs is set by the second bias voltage Vs.In another embodiment, the second bias voltage Vs can be common voltage Vcom, and grid source electrode pressure drop Vgs is set by the first bias voltage Vg.
Fig. 6 is used for the induction locating method process flow diagram of liquid crystal indicator shown in Figure 2 200 for the present invention.As shown in Figure 6, the flow process 900 of induction locating method comprises the following step:
Step S905: in first period, switch element 280 is electrically connected readout signal processing unit 295 and data line 230;
Step S910: in first period, first grid polar curve 251 transmission first grid signals are to enable sensing unit 270 output read output signals to readout signal processing unit 295;
Step S915: in second period, switch element 280 is electrically connected source electrode driver 210 and data line 230;
Step S920: in second period, second grid line 252 transmission second grid signals receive the data-signal of being exported by source electrode driver 210 to enable pixel cell 260;
Step S925: in the 3rd period, readout signal processing unit 295 is carried out the sensed position analysis of read output signal; And
Step S930: in the 4th period, pre-charging data line 230 is to predetermined voltage.
In the flow process 900 of induction locating method, first period, second period and the 4th period do not overlap each other, and first period can be before or after second period.The 4th period is after second period or first period, predetermined voltage can be and is used for the required reset voltage of storage capacitors of sensing unit 270 that charges, or the required pixel voltage of pixel capacitance (such as liquid crystal capacitance and storage capacitors) of the pixel cell 260 that is used for charging.The 3rd period can overlap first period, second period or the 4th period.The time span of first period can be identical or be different from the time span of second period.The time span of first period can be set according to allow duration of charging or allowable voltage scope corresponding to the storage capacitors of sensing unit 270.The time span of second period can be set according to allow duration of charging or allowable voltage scope corresponding to the pixel capacitance of pixel cell 260.
In sum, in the circuit structure of the liquid crystal indicator of tool induction mechanism of the present invention, the read output signal of each sensing unit transmits via respective data lines, does not need to be provided with in addition sense wire, so can avoid aperture ratio of shrinkage pixel.In addition, in corresponding induction locating method, the transmission period of read output signal and the transmission period of data-signal do not overlap each other, and therefore can avoid the aanalogvoltage of data-signal disturbed by the read output signal transmission.
Though the present invention discloses as above with embodiment; right its is not in order to qualification the present invention, any those skilled in the art of the present technique, without departing from the spirit and scope of the present invention; when can doing various changes and retouching, so protection scope of the present invention is when with being as the criterion that claim was defined.
Claims (7)
1. an induction locating method is characterized in that, described induction locating method comprises:
One liquid crystal indicator is provided, and described liquid crystal indicator comprises:
One data line;
First grid polar curve;
The second grid line;
One sensing unit is electrically connected on described data line and described first grid polar curve;
One pixel cell is electrically connected on described data line and described second grid line;
The one source pole driver;
One readout signal processing unit; And
One switch element comprises first end, second end and the 3rd end, and wherein said first end is electrically connected on described source electrode driver, and described second end is electrically connected on described readout signal processing unit, and described the 3rd end is electrically connected on described data line;
In one first period, described switch element is electrically connected described second end and described the 3rd end, in order to be electrically connected described readout signal processing unit and described data line;
In described first period, described first grid polar curve transmission first grid signal is so that can export a read output signal to described readout signal processing unit by described sensing unit;
In one second period, described switch element is electrically connected described first end and described the 3rd end, in order to be electrically connected described source electrode driver and described data line;
In described second period, described second grid line transmission second grid signal is so that can receive a data-signal of being exported by described source electrode driver by described pixel cell; And
In the 3rd period, described readout signal processing unit is carried out the sensed position analysis of described read output signal;
Wherein said first period and described second period do not overlap each other.
2. induction locating method as claimed in claim 1 is characterized in that, described first period is before or after described second period.
3. induction locating method as claimed in claim 1 is characterized in that, described the 3rd period overlaps described first period or described two periods.
4. induction locating method as claimed in claim 1 is characterized in that, the time span of described first period is identical or be different from the time span of described second period.
5. induction locating method as claimed in claim 1 is characterized in that, described induction locating method comprises:
According to corresponding to the storage capacitors of described sensing unit allow duration of charging or allowable voltage scope, to set the time span of described first period.
6. induction locating method as claimed in claim 1 is characterized in that, described induction locating method comprises:
According to corresponding to the pixel capacitance of described pixel cell allow duration of charging or allowable voltage scope, to set the time span of described second period.
7. induction locating method as claimed in claim 1 is characterized in that, described induction locating method also comprises:
In one the 4th period, described data line to a predetermined voltage of precharge;
Wherein said the 4th period, described first period and described second period do not overlap each other.
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| CN2009101610244A CN101609220B (en) | 2009-07-30 | 2009-07-30 | Liquid crystal display device with induction mechanism and induction locating method thereof |
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| TWI522996B (en) * | 2011-03-17 | 2016-02-21 | 友達光電股份有限公司 | Liquid crystal display having photo-sensing input mechanism and photo-sensing input device |
| TWI678694B (en) | 2018-09-14 | 2019-12-01 | 友達光電股份有限公司 | Display device driving method and display device |
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