CN103376578A - Touch liquid crystal display - Google Patents
Touch liquid crystal display Download PDFInfo
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- CN103376578A CN103376578A CN2012101182385A CN201210118238A CN103376578A CN 103376578 A CN103376578 A CN 103376578A CN 2012101182385 A CN2012101182385 A CN 2012101182385A CN 201210118238 A CN201210118238 A CN 201210118238A CN 103376578 A CN103376578 A CN 103376578A
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Abstract
A touch liquid crystal display comprises a display panel, a scanning line driver, a data line driver, a processing unit and a timing controller. The timing controller is used for receiving an image signal provided by the processing unit and controlling the scanning line driver and the data line driver to provide a plurality of equal constant currents during a horizontal blank period or vertical blank period; the equal constant currents flow into a plurality of corresponding pixel capacitors; voltage changes of the pixel capacitors are detected during a fixed time; accordingly, capacitances of the pixel capacitors are calculated according to magnitude of the currents, length of the fixed time and the voltage changes, and whether the positions of the display panel, corresponding to the pixel capacitors, are touched or not is judged.
Description
Technical field
The invention relates to a kind of touch-control liquid crystal display, and particularly cause touched thing capacitance variations to detect the touch-control liquid crystal display of touch position relevant for a kind of touching thing that utilizes.
Background technology
Present touch-control liquid crystal display can be divided into two kinds of external labeling type and in-building types.The touch-control liquid crystal display of adopting the external labeling type structure mainly by the display panel that Presentation Function is provided with provide the contact panel of touch controllable function to be consisted of, because it need to add contact panel so that integral thickness is thicker and weight is heavier, not only cost higher and can't satisfying the market on for the demand of display slimming, the setting of contact panel also can cause the whole penetrance of touch-control liquid crystal display to descend in addition.The touch-control liquid crystal display of adopting the in-building type structure is built-in sensing circuit in the pixel cell of display panel mainly, because the sensing circuit of the built-in can occupy the arrangement space of pixel cell so that the aperture opening ratio of viewing area descends, and then cause the whole penetrance of touch-control liquid crystal display to descend.
Summary of the invention
In view of this, purpose of the present invention can directly utilize the pixel capacitance in the display panel to change to detect touch position proposing a kind of touch-control liquid crystal display.
For achieving the above object or other purpose, the present invention proposes a kind of touch-control liquid crystal display, and it comprises a display panel, one scan line drive, a datawire driver, a processing unit and time schedule controller.Wherein, this display panel has multi-strip scanning line and many data lines, and the confluce of every sweep trace and every data line all disposes a pixel cell, and this pixel cell has a pixel capacitance.This scan line driver is coupled to those sweep traces, has a horizontal interregnum between during the enabling of per two adjacent sweep traces.This datawire driver is coupled to those data lines.This processing unit is used for providing a signal of video signal, and this signal of video signal comprises a plurality of picture datas, has during the vertical blank between per two adjacent picture datas.This time schedule controller is coupled to this processing unit, this scan line driver and this datawire driver, this time schedule controller is used for receiving this signal of video signal, and by control this scan line driver during this horizontal interregnum or this vertical blank, provide the identical electric current of deciding of a plurality of sizes to flow into a plurality of corresponding pixel capacitances with this datawire driver, and within a set time, detect the voltage variety of those corresponding pixel capacitances, be somebody's turn to do the size that decide electric current with basis, the length of this set time and those voltage varieties calculate the capacitance of those corresponding pixel capacitances, judge by this whether the position of this display panel that those corresponding pixel capacitances correspond to is touched.
In an embodiment of the present invention, this time schedule controller also be used for driving by this scan line driver of control and this datawire driver this display panel during non-this vertical blank of this signal of video signal, show those picture datas one of them.
In an embodiment of the present invention, this datawire driver comprises a plurality of constant current sources and a plurality of voltage-level detector, those constant current sources are used for providing those to decide electric current, those voltage-level detectors are used for detecting the voltage variety of those corresponding pixel capacitances within this set time, every or every at least one data line all be coupled to those constant current sources one of them and those voltage-level detectors one of them.
In an embodiment of the present invention, this datawire driver also comprises a touch-control judging unit, this touch-control judging unit is coupled to those voltage-level detectors, whether this touch-control judging unit is used for calculating according to size, the length of this set time and those voltage varieties that should decide electric current the capacitance of those corresponding pixel capacitances, touched with the position of judging this display panel that those corresponding pixel capacitances are corresponded to.
In an embodiment of the present invention, this processing unit also is used for receiving an input signal, and provides this signal of video signal according to this input signal.In addition, this processing unit comprises a proportional zoom device, and this proportional zoom device is used for adjusting the resolution of those picture datas.
In an embodiment of the present invention, this touch-control liquid crystal display is active matrix liquid crystal display (Active-Matrix Liquid Crystal Display, AM-LCD).In addition, this active matrix liquid crystal display can be Thin Film Transistor-LCD (Thin Film Transistors Liquid Crystal Display, TFT LCD).
The present invention is because being used in the voltage variety that identical the deciding of a plurality of sizes is provided during horizontal interregnum or the vertical blank electric current flows into a plurality of corresponding pixel capacitances and detect those corresponding pixel capacitances within the set time, the capacitance that calculates accordingly those corresponding pixel capacitances judges whether the position of the display panel that corresponds to is touched, because directly utilizing the pixel capacitance in the display panel to change to detect touch position, do not need to add contact panel need to be in pixel cell yet built-in sensing circuit, and do not have the problem that the touch-control liquid crystal display integral thickness is thicker and weight is heavier and whole penetrance descends.
For above and other objects of the present invention, feature and advantage can be become apparent, preferred embodiment cited below particularly, and cooperation accompanying drawing are described in detail below.
Description of drawings
Fig. 1 is the circuit diagram of touch-control liquid crystal display according to an embodiment of the invention.
Fig. 2 is the circuit diagram of datawire driver according to an embodiment of the invention.
Label declaration
1: touch-control liquid crystal display
11: display panel
12: scan line driver
13: datawire driver
131: constant current source
132: voltage-level detector
133: the touch-control judging unit
14: processing unit
15: time schedule controller
Clc: liquid crystal capacitance
Cs: storage capacitors
DL1～DLn: data line
GL1～GLm: sweep trace
P1n: pixel cell
SW: switch
IN: input signal
PI: signal of video signal.
Embodiment
Fig. 1 is the circuit diagram of touch-control liquid crystal display according to an embodiment of the invention.See also Fig. 1, touch-control liquid crystal display 1 comprises display panel 11, scan line driver 12, datawire driver 13, processing unit 14 and time schedule controller 15.In one embodiment, touch-control liquid crystal display 1 can be AM-LCD, and AM-LCD can be TFT LCD.
Display panel 11 has multi-strip scanning line GL1～GLm and many data line DL1～DLn, and wherein, m, n are the positive integer greater than 1.The confluce of every sweep trace and every data line all disposes a pixel cell, and each pixel cell all has a switch and a pixel capacitance, and pixel capacitance comprises liquid crystal capacitance and storage capacitors.For example, sweep trace GL1 and data line DLn confluce namely dispose pixel cell P1n, and pixel cell P1n has thin film transistor (TFT) as interrupteur SW, and have the pixel capacitance that comprises liquid crystal capacitance Clc and storage capacitors Cs.
Fig. 2 is the circuit diagram of datawire driver according to an embodiment of the invention.See also Fig. 2, take datawire driver 13 shown in Figure 1 as example, datawire driver 13 comprises a plurality of constant current sources 131, a plurality of voltage-level detector 132 and touch-control judging unit 133.Constant current source 131 is used for providing deciding electric current.Voltage-level detector 132 is used for detecting the voltage variety of corresponding pixel capacitance within the set time.In the present embodiment, every data line all is coupled to a constant current source and a voltage-level detector among data line DL1～DLn.But be not limited only to this, for example, can just be coupled to a constant current source and a voltage-level detector every a data line among data line DL1～DLn, though so can reduce the precision that touching detects, can reduce constant current source and voltage-level detector quantity and reduce cost.
Touch-control judging unit 133 is coupled to voltage-level detector 132.Whether touch-control judging unit 133 is used for according to the length of the known size of deciding electric current, known set time and the capacitance that voltage-level detector 132 detected voltage varieties calculate corresponding pixel capacitance, touched with the position of judging display panel that corresponding pixel capacitance is corresponded to 11.
In sum, the present invention provides the identical electric current of deciding of a plurality of sizes to flow into a plurality of corresponding pixel capacitances during horizontal interregnum or vertical blank, and within the set time, detect the voltage variety of those corresponding pixel capacitances, the capacitance that calculates accordingly those corresponding pixel capacitances judges whether the position of the display panel that corresponds to is touched, because directly utilizing the pixel capacitance in the display panel to change to detect touch position, do not need to add contact panel need to be in pixel cell yet built-in sensing circuit, and do not have the problem that the touch-control liquid crystal display integral thickness is thicker and weight is heavier and whole penetrance descends.
Although the present invention discloses as above with preferred embodiment; right its is not for restriction the present invention, any those of ordinary skills, without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention is when with being as the criterion that claims were defined.
Claims (8)
1. touch-control liquid crystal display comprises:
One display panel has multi-strip scanning line and many data lines, and the confluce of every sweep trace and every data line all disposes a pixel cell, and this pixel cell has a pixel capacitance;
The one scan line drive, it is coupled to those sweep traces, has a horizontal interregnum between during the enabling of per two adjacent sweep traces;
One datawire driver, it is coupled to those data lines;
One processing unit is used for providing a signal of video signal, and this signal of video signal comprises a plurality of picture datas, has during the vertical blank between per two adjacent picture datas; And
Time schedule controller, it is coupled to this processing unit, this scan line driver and this datawire driver, this time schedule controller is used for receiving this signal of video signal, and by control this scan line driver during this horizontal interregnum or this vertical blank, provide the identical electric current of deciding of a plurality of sizes to flow into a plurality of corresponding pixel capacitances with this datawire driver, and within a set time, detect the voltage variety of those corresponding pixel capacitances, be somebody's turn to do the size that decide electric current with basis, the length of this set time and those voltage varieties calculate the capacitance of those corresponding pixel capacitances, judge by this whether the position of this display panel that those corresponding pixel capacitances correspond to is touched.
2. touch-control liquid crystal display as claimed in claim 1, wherein, this time schedule controller also be used for driving by this scan line driver of control and this datawire driver this display panel during non-this vertical blank of this signal of video signal, show those picture datas one of them.
3. touch-control liquid crystal display as claimed in claim 1, wherein, this datawire driver comprises a plurality of constant current sources and a plurality of voltage-level detector, those constant current sources are used for providing those to decide electric current, those voltage-level detectors are used for detecting the voltage variety of those corresponding pixel capacitances within this set time, every or every at least one data line all be coupled to those constant current sources one of them and those voltage-level detectors one of them.
4. touch-control liquid crystal display as claimed in claim 3, wherein, this datawire driver also comprises a touch-control judging unit, this touch-control judging unit is coupled to those voltage-level detectors, whether this touch-control judging unit is used for calculating according to size, the length of this set time and those voltage varieties that should decide electric current the capacitance of those corresponding pixel capacitances, touched with the position of judging this display panel that those corresponding pixel capacitances are corresponded to.
5. touch-control liquid crystal display as claimed in claim 1, wherein, this processing unit also is used for receiving an input signal, and provides this signal of video signal according to this input signal.
6. touch-control liquid crystal display as claimed in claim 1, wherein, this processing unit comprises a proportional zoom device, this proportional zoom device is used for adjusting the resolution of those picture datas.
7. touch-control liquid crystal display as claimed in claim 1, wherein, this touch-control liquid crystal display is active matrix liquid crystal display.
8. touch-control liquid crystal display as claimed in claim 7, wherein, this active matrix liquid crystal display is Thin Film Transistor-LCD.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101182385A CN103376578A (en) | 2012-04-20 | 2012-04-20 | Touch liquid crystal display |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101182385A CN103376578A (en) | 2012-04-20 | 2012-04-20 | Touch liquid crystal display |
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| CN103376578A true CN103376578A (en) | 2013-10-30 |
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| CN2012101182385A Pending CN103376578A (en) | 2012-04-20 | 2012-04-20 | Touch liquid crystal display |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2015131467A1 (en) * | 2014-03-07 | 2015-09-11 | 敦泰科技有限公司 | Touch display apparatus, driving circuit thereof and driving method therefor, and electronic apparatus |
| CN106598320A (en) * | 2015-10-20 | 2017-04-26 | 乐金显示有限公司 | Display device having touch sensor and driving method thereof |
| CN106775131A (en) * | 2017-02-20 | 2017-05-31 | 京东方科技集团股份有限公司 | A kind of touch display substrate and touch control display method |
| CN107402668A (en) * | 2016-05-19 | 2017-11-28 | 禾瑞亚科技股份有限公司 | Touch method, touch processing device and electronic system for avoiding pixel update interference |
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| US20070030221A1 (en) * | 2005-08-04 | 2007-02-08 | Sang-Jin Pak | Liquid crystal display including sensing unit |
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| CN101149659B (en) * | 2006-09-20 | 2010-09-15 | 凌阳科技股份有限公司 | Touch control input device, touch positioning device and its method |
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| CN1471072A (en) * | 2002-07-23 | 2004-01-28 | 李友端 | Liquid crystal display device and its contact control method |
| JP2006184273A (en) * | 2004-11-09 | 2006-07-13 | Sharp Corp | System for measuring capacitance |
| US20070030221A1 (en) * | 2005-08-04 | 2007-02-08 | Sang-Jin Pak | Liquid crystal display including sensing unit |
| CN101149659B (en) * | 2006-09-20 | 2010-09-15 | 凌阳科技股份有限公司 | Touch control input device, touch positioning device and its method |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015131467A1 (en) * | 2014-03-07 | 2015-09-11 | 敦泰科技有限公司 | Touch display apparatus, driving circuit thereof and driving method therefor, and electronic apparatus |
| US10133415B2 (en) | 2014-03-07 | 2018-11-20 | Focaltech Electronics, Ltd. | Touch display apparatus, driving circuit thereof and driving method therefor, and electronic apparatus |
| CN106598320A (en) * | 2015-10-20 | 2017-04-26 | 乐金显示有限公司 | Display device having touch sensor and driving method thereof |
| CN106598320B (en) * | 2015-10-20 | 2020-02-18 | 乐金显示有限公司 | Display device having touch sensor and driving method thereof |
| CN107402668A (en) * | 2016-05-19 | 2017-11-28 | 禾瑞亚科技股份有限公司 | Touch method, touch processing device and electronic system for avoiding pixel update interference |
| CN107402668B (en) * | 2016-05-19 | 2020-08-28 | 禾瑞亚科技股份有限公司 | Touch method, touch processing device and electronic system for avoiding pixel update interference |
| CN106775131A (en) * | 2017-02-20 | 2017-05-31 | 京东方科技集团股份有限公司 | A kind of touch display substrate and touch control display method |
| CN106775131B (en) * | 2017-02-20 | 2020-01-21 | 京东方科技集团股份有限公司 | Touch display substrate and touch display method |
| US11221714B2 (en) | 2017-02-20 | 2022-01-11 | Boe Technology Group Co., Ltd. | Touch control display substrate and touch control display method |
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Application publication date: 20131030 |