CN101975998A - Liquid crystal display (LCD) display screen with touch detection function and implement method thereof - Google Patents
Liquid crystal display (LCD) display screen with touch detection function and implement method thereof Download PDFInfo
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- CN101975998A CN101975998A CN2010102952985A CN201010295298A CN101975998A CN 101975998 A CN101975998 A CN 101975998A CN 2010102952985 A CN2010102952985 A CN 2010102952985A CN 201010295298 A CN201010295298 A CN 201010295298A CN 101975998 A CN101975998 A CN 101975998A
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Abstract
The invention provides a liquid crystal display (LCD) display screen with touch detection function and an implement method thereof. A thin film transistor (TFT) substrate of the display screen is integrated with a touch detection control circuit; a scanning electrode and a signal electrode of the TFT substrate are taken as an electrode of a touch pad; and a specific position of conductor contact or electric field generation is determined by detecting the scanning electrode and the signal electrode because of current change caused by an external conductor or an electric field, or the touch position is judged by comparing a write signal on the scanning electrode with a touch signal acquired by a column electrode touch detection circuit or judged according to the distortion condition of the two. The LCD display screen with the touch detection function has a simple structure, low cost and high performance.
Description
Technical field
The invention belongs to flat pannel display and touch technology field, relate to LCD display and its implementation of a kind of built-in touch measuring ability.
Background technology
Electron device such as mobile phone, panel computer is provided with touch panel at present, the method of equipment being controlled by touch sensible normally realizes by contact panel and display panel are bonded together, the Trackpad that is adopted is generally resistance-type or condenser type, determine the position that the operator touches by the variation that detects resistance or capacitance, thereby realize touching control.
The implementation of the display screen of existing band touch controllable function is that touch pad and display screen are bonded to together, display screen is realized the function of demonstration, touch pad is realized the detection of touch location, pass through external circuit again, touch location and displaying contents is interrelated, under the processing of operating system, realize displaying contents is touched control.This display screen and touch pad bonding is realized showing shortcoming with the mode of touch controllable function, the one, increased the amount of parts of technological process and device, the 2nd, on display panel, increased Trackpad, reduced the transmitance of visible light.
Summary of the invention
Technical matters to be solved by this invention provides LCD display and its implementation of a kind of simple in structure, with low cost and built-in touch measuring ability that device performance is good.
For achieving the above object, the invention provides a kind of LCD display of built-in touch measuring ability, comprise first glass substrate (1), place the incident polaroid (9) of first glass substrate (1) one side, place the TFT substrate (11) of first glass substrate (1) opposite side, the common electrode (13) that is oppositely arranged with TFT substrate (11), be clamped in the liquid crystal layer (12) between TFT substrate (11) and the common electrode (13), place the colour filter film (14) of common electrode (13) opposite side successively, place second glass substrate (15) of colour filter film (14) opposite side, and the incident polaroid that places second glass substrate (15) opposite side.
As the preferred embodiments of the present invention, described TFT substrate (11) be integrated with some signal electrodes (c1～cn) and with the signal electrode (scan electrode of right-angled intersection of c1～cn) (r1～rn), and with some signal electrodes (the signal electrode driving circuit (2) of c1～cn) be connected is with the scan electrode (scan electrode driving circuit (4) of r1～rn) be connected; ((end of r1～rn) is connected with to touch and detects control circuit for the end of c1～cn) and scan electrode at signal electrode, this touch detects control circuit and comprises that first and second touch detection control circuit (7,8), wherein, first touches detection control circuit (7) and scan electrode (r1～rn) link to each other, second touch detection control circuit (8) and the signal electrode (c1～cn) link to each other.
For achieving the above object, the invention provides a kind of implementation method of LCD display of built-in touch measuring ability, ((c1～cn) is as the electrode of touch pad for r1～rn) and signal electrode to utilize scan electrode on the TFT substrate (11), carrying out signal in LCD display writes fashionable, each sweep trace carry out signal write finish after, be set certain touch detection time, in the touch detection time that is provided with, (r1～rn) and signal electrode (apply certain potential difference (PD) on the c1～cn) to described scan electrode, this voltage difference is greater than zero, but go up the open valve threshold voltage of transistor (6) switch less than TFT substrate (11), in the touch detection time that is provided with, when taking place if any touch, then because capacity coupled influence, the capacity of the capacitor (Cs) of transistor (6) can change, thereby the quantity of electric charge that causes signal electrode and scanning infall changes, thereby on electrode, form small electric current, utilize this electric current, detect control circuit by touching, thereby scan electrode and signal electrode are carried out changing and detecting because of being subjected to electric current that extraneous conductor or electric field cause, and then the scan electrode sequence number that changes of definite electric current and the sequence number of signal electrode, according to the sequence number of scan electrode and signal electrode, can determine the particular location that conductor contacts or electric field influence takes place that causes that electric current changes at last.
For achieving the above object, the invention provides a kind of implementation method of LCD display of built-in touch measuring ability, with the scan electrode on the TFT substrate and signal electrode electrode as touch pad, write fashionable, in identical time for writing signal, touch signal to write signal on a certain scan electrode and row electrode touch detection circuit detection gained compares, distortion situation according to both is judged the position that touches generation, take place if having to touch, detection signal produces distortion with write signal at the corresponding row electricity place of touch nidus.
The present invention the invention provides and a kind ofly has the following advantages at least for achieving the above object:
1. the circuit that will touch detection signal is integrated on the TFT substrate, reduced the use amount of outside independent component, simplified the connecting portion between circuit, device reliability is improved, the demonstration of LCD and the function of touch pad are integrated on the TFT substrate simultaneously, have reduced the cost of assembly;
2. the present invention will show with touch controllable function and be integrated on the TFT substrate, do not need outside Trackpad can realize touch controllable function, having simplified existing display screen and touch pad are bonded together realizes showing and the device architecture of touch controllable function, do not rely on independently touch pad owing to touch the realization of measuring ability, do not exist Trackpad under the existing mode to the stopping of LCD display light, improved the brightness of display screen;
3. LCD display of the present invention, its Presentation Function realizes that based on identical electrode display resolution and position are corresponding one by one with the detection resolution and the position of touch sensor with the touch perceptional function.Existing LCD display and touch pad need carry out contraposition when bonding, otherwise the deviation of touch location detection will occur;
The present invention since on display screen the integrated function of touch pad, mode with respect to the bonding touch pad of existing display screen, can reduce the thickness and the weight of assembly, be used for mobile phone, portable media player etc. and pursue electronic equipment light, thinning, can reduce weight of equipment and thickness.
Description of drawings
Fig. 1 is the structural representation of the LCD display of the built-in touch measuring ability of the present invention;
Fig. 2 is the circuit diagram of the LCD display TFT substrate of the built-in touch measuring ability of the present invention.
The corresponding relation of number in the figure and element is as follows:
| 1 | First glass substrate | 2 | The signal electrode driving circuit |
| 4 | Scan electrode driving circuit | 6 | Transistor |
| 7 | First touches the measuring ability circuit | 8 | Second touches the |
| 9 | The |
11 | The |
| 12 | |
13 | |
| 14 | The |
15 | |
| 16 | The incident polaroid | r1～rn | Scan electrode |
| c1～cn | Signal electrode |
Embodiment
Be described in detail below in conjunction with accompanying drawing LCD display and its implementation the built-in touch measuring ability of the present invention:
1. the structure of display screen of the present invention
See also shown in Figure 1, LCD display of the present invention comprises first glass substrate 1, place the incident polaroid 9 of first glass substrate, 1 one sides, place first glass substrate, 1 opposite side TFT substrate 11, and the common electrode 13 that is oppositely arranged of TFT substrate, be clamped in liquid crystal 12 between TFT substrate and the common electrode 13, successively place common electrode 13 opposite sides colour filter film 14, place second glass substrate 15 of colour filter film 14 opposite sides and the incident polaroid 16 that places second glass substrate, 15 opposite sides.
Light penetrates from TFT substrate 11 side B from the outside A incident of second glass substrate 15 of colour filter film 14 sides.When finger or conductor were touched the outside of TFT substrate 11, the touch detection circuit on the TFT substrate 11 carried out detection and location to the position that touching takes place.
See also shown in Figure 2, be integrated with on the described TFT substrate 11 some signal electrode c1～cn and with the scan electrode r1～rn of signal electrode c1～cn right-angled intersection, and the signal electrode driving circuit 2 that is connected with some signal electrode c1～cn, the scan electrode driving circuit 4 that is connected with scan electrode r1～rn, in addition, be connected with touch detection control circuit at the end of signal electrode c1～cn and the end of scan electrode r1～rn, this touch detects control circuit and comprises that first and second touch detection control circuit 7,8, wherein, first touches detection control circuit 7 links to each other with scan electrode r1～rn, and second touches detection control circuit 8 links to each other with signal electrode c1～cn.
Infall at signal electrode c1～cn and scan electrode r1～rn is connected with transistor 6, and described transistor 6 includes capacitor C s; Described first and second touch detection control circuit 7,8 comprises amplifying circuit and testing circuit respectively.
2. the principle of display screen implementation method of the present invention
When having voltage difference on scan electrode r1～rn and the signal electrode c1～cn, because the charge-storage effect of capacitor C s, the infall of scan electrode r1～rn and signal electrode c1～cn produces electric charge, when this capacitor C s is subjected to extraneous interference, when having conductor or electric field to come close to or in contact with as first glass substrate, 1 outer surface, because capacity coupled influence, small change can take place in the capacity of capacitor Cs, thereby the quantity of electric charge that causes the electrode crossing place changes, thereby, infall at scan electrode r1～rn and signal electrode c1～cn forms small electric current, utilize this electric current, by amplifying circuit and testing circuit at an end of scan electrode and signal electrode, thereby scan electrode and signal electrode are carried out changing and detecting because of being subjected to electric current that extraneous conductor or electric field cause, and then the scan electrode sequence number that changes of definite electric current and the sequence number of signal electrode, according to the sequence number of scan electrode and signal electrode, can determine the particular location that conductor contacts or electric field influence takes place that causes that electric current changes at last.
3. the specific implementation method of display screen of the present invention
Implementation method of the present invention is under incident polaroid 16 and 9 assistance of outgoing polaroid, by electric field the molecular arrangement direction of the liquid crystal layer in the display screen is controlled, thereby realize light intensity is controlled, each pixel can determine the light intensity of certain area, a considerable number of pel array, can realize that a width of cloth has color, the image of light and shade contrast is arranged.
The effect of TFT substrate 11 is to realize writing of video data, determines that promptly each pixel sees through the size of light intensity, and it is kept the regular hour.As shown in Figure 1, transistor 6 is applied voltage, after signal electrode driving circuit 2 receives this signal, give low level of signal electrode r2, simultaneously, after scan electrode driving circuit 4 receives this signal, give high level of scan electrode r1, between two electrodes of the transistor 6 of the infall of signal electrode and scan electrode, just formed the electric field of certain field intensity like this, after the intensity of this electric field surpasses the open valve threshold voltage of transistor 6 switches, transistor 6 is opened, and capacitor C s begins charging.At this moment, electric field between capacitor C s and the public electrode 13 arranges the liquid crystal molecule in the liquid crystal layer to change, thereby a certain amount of light is seen through from liquid crystal layer, the light quantity that sees through depends on that what of charge capacity Cs go up, and what of the last charge volume of Cs are then depended on the voltage difference between signal electrode c2 and the scan electrode r1.By distributing certain sweep time for each scan electrode, thereby in given sweep time, charge to Cs, after charging is finished, then the high level on the scan electrode is removed, transistor is closed, electric weight on the capacitor C s is kept, change because liquid crystal relies on electric field action to produce molecular arrangement, the electric current that passes through is very little almost nil, therefore, the show state of pixel is maintained, and writes until write data next time.Beyond given sweep time, generally give scan electrode the level identical, so that transistor 6 is in closed condition with signal electrode.
In the present embodiment,, apply certain high level, make the voltage difference that keeps certain between two electrodes of transistor 6 (threshold values that this voltage difference must be opened less than transistor) to scan electrode as beyond given sweep time.At this moment, if TFT substrate 11 glass outer sides are subjected to the touch (as Fig. 1) of conductor such as people's finger, the electric capacity that forms between scan electrode and the signal electrode (as c2 and r1) then, small change can take place in its capacitance, causes the quantity of electric charge on the electrode to change.At this moment, by first touch detection circuit 7 of scan electrode one end setting and the second touch testing circuit 8 of signal electrode one end setting, can detect the charge variation on pairing signal electrode of touch location and the scan electrode, last according to detecting the scan electrode sequence number of charge variation and the sequence number of signal electrode, can determine to touch the position of generation.
Above-mentioned described be a kind of embodiment of the present invention, introduce another kind of implementation of the present invention below:
In the present embodiment, make to write simultaneously by the shows signal to the detection of touch location and LCD display and carry out, promptly when each scan electrode scanning write shows signal, detecting had no touch to take place.
Because the function of LCD display of the present invention and touch pad realizes by the TFT substrate 11 of LCD display, writing of video data is fashionable carrying out, for each scan electrode, data on the corresponding signal electrode write simultaneously carries out, promptly for a certain scan electrode rn, data on signal electrode c1～cn write simultaneously, and (1≤x≤n), the signal that is caused by touch is submerged in the write signal of c1～cn for the scan electrode cx that touches the nidus correspondence.For detecting this signal, need the row electrode touched and detect control circuit (as among Fig. 2 8) and detect the signal that obtains and compare with the signal that writes.If touch signal is arranged, then touch signal and write signal stack, when comparing with write signal, the detection signal on the row electrode of touch nidus correspondence will show as the distortion of certain amplitude.The row electrode sequence number of nidus correspondence can be determined to touch in the position of distortion thus.The scan electrode sequence number of correspondence when detecting again, row electrode sequence number and scan electrode sequence number thus can determine to touch the position of generation.
The above only is one embodiment of the present invention, it or not whole or unique embodiment, the conversion of any equivalence that those of ordinary skills take technical solution of the present invention by reading instructions of the present invention is claim of the present invention and contains.
Claims (4)
1. the LCD display of a built-in touch measuring ability, it is characterized in that: comprise first glass substrate (1), place the incident polaroid (9) of first glass substrate (1) one side, place first glass substrate (1) opposite side and be integrated with and touch the TFT substrate (11) that detects control circuit, the common electrode (13) that is oppositely arranged with TFT substrate (11), be clamped in the liquid crystal layer (12) between TFT substrate (11) and the common electrode (13), place the colour filter film (14) of common electrode (13) opposite side successively, place second glass substrate (15) of colour filter film (14) opposite side, and the incident polaroid (16) that places second glass substrate (15) opposite side.
2. the LCD display of built-in touch measuring ability as claimed in claim 1, it is characterized in that: described TFT substrate (11) be integrated with some signal electrodes (c1～cn) and with the signal electrode (scan electrode of right-angled intersection of c1～cn) (r1～rn), and with some signal electrodes (the signal electrode driving circuit (2) of c1～cn) be connected is with the scan electrode (scan electrode driving circuit (4) of r1～rn) be connected; Described touch detects control circuit and is connected the signal electrode (end of c1～cn) and the scan electrode (end of r1～rn), this touch detects control circuit and comprises that first and second touch detection control circuit (7,8), wherein, first touches detection control circuit (7) and scan electrode (r1～rn) link to each other, second touch detection control circuit (8) and the signal electrode (c1～cn) link to each other.
3. the implementation method of the LCD display of the described built-in touch measuring ability of claim 1, it is characterized in that: ((c1～cn) is as the electrode of touch pad for r1～rn) and signal electrode to utilize scan electrode on the TFT substrate (11), carrying out signal in LCD display writes fashionable, each sweep trace carry out signal write finish after, be set certain touch detection time, in the touch detection time that is provided with, (r1～rn) and signal electrode (apply certain potential difference (PD) on the c1～cn) to described scan electrode, this voltage difference is greater than zero, but go up the open valve threshold voltage of transistor (6) switch less than TFT substrate (11), in the touch detection time that is provided with, when taking place if any touch, then because capacity coupled influence, the capacity of the capacitor (Cs) of transistor (6) can change, thereby the quantity of electric charge that causes signal electrode and scanning infall changes, thereby on electrode, form small electric current, utilize this electric current, detect control circuit by touching, thereby scan electrode and signal electrode are carried out changing and detecting because of being subjected to electric current that extraneous conductor or electric field cause, and then the scan electrode sequence number that changes of definite electric current and the sequence number of signal electrode, according to the sequence number of scan electrode and signal electrode, can determine the particular location that conductor contacts or electric field influence takes place that causes that electric current changes at last.
4. the implementation method of the LCD display of the described built-in touch measuring ability of claim 1, it is characterized in that: with the scan electrode on the TFT substrate and signal electrode electrode as touch pad, write fashionable, in identical time for writing signal, touch signal to write signal on a certain scan electrode and row electrode touch detection circuit detection gained compares, distortion situation according to both is judged the position that touches generation, take place if having to touch, detection signal produces distortion with write signal at the corresponding row electricity place of touch nidus.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010102952985A CN101975998A (en) | 2010-09-28 | 2010-09-28 | Liquid crystal display (LCD) display screen with touch detection function and implement method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010102952985A CN101975998A (en) | 2010-09-28 | 2010-09-28 | Liquid crystal display (LCD) display screen with touch detection function and implement method thereof |
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| CN101975998A true CN101975998A (en) | 2011-02-16 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103294286A (en) * | 2012-02-27 | 2013-09-11 | 晨星软件研发(深圳)有限公司 | Method for touching screen with display panel and relevant device |
| CN103309486A (en) * | 2012-03-13 | 2013-09-18 | 上海天马微电子有限公司 | Touch display device and touch position detection method and system thereof |
| CN104007869A (en) * | 2013-02-22 | 2014-08-27 | 乐金显示有限公司 | Display device with integrated touch screen |
| CN104035249A (en) * | 2013-03-05 | 2014-09-10 | 钟钢 | Liquid crystal display device integrating touch function and touch position detecting method thereof |
| WO2014169520A1 (en) * | 2013-04-16 | 2014-10-23 | 北京京东方光电科技有限公司 | Capacitor touch array substrate, touch display screen and driving method therefor |
| WO2015032107A1 (en) * | 2013-09-06 | 2015-03-12 | 深圳市华星光电技术有限公司 | In cell touch screen and liquid crystal display |
| CN108958090A (en) * | 2017-05-22 | 2018-12-07 | 比亚迪股份有限公司 | Circuit and control method, the household electrical appliance and consumer electronics device of multiplexing port |
| CN109164667A (en) * | 2018-09-03 | 2019-01-08 | 深圳小淼科技有限公司 | A kind of projector |
-
2010
- 2010-09-28 CN CN2010102952985A patent/CN101975998A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103294286A (en) * | 2012-02-27 | 2013-09-11 | 晨星软件研发(深圳)有限公司 | Method for touching screen with display panel and relevant device |
| CN103309486A (en) * | 2012-03-13 | 2013-09-18 | 上海天马微电子有限公司 | Touch display device and touch position detection method and system thereof |
| CN103309486B (en) * | 2012-03-13 | 2016-08-10 | 上海天马微电子有限公司 | Touch display unit and touch position detecting method thereof and system |
| CN104007869A (en) * | 2013-02-22 | 2014-08-27 | 乐金显示有限公司 | Display device with integrated touch screen |
| CN104007869B (en) * | 2013-02-22 | 2017-08-22 | 乐金显示有限公司 | Display device with integrated form touch-screen |
| CN104035249A (en) * | 2013-03-05 | 2014-09-10 | 钟钢 | Liquid crystal display device integrating touch function and touch position detecting method thereof |
| CN104035249B (en) * | 2013-03-05 | 2017-01-25 | 钟钢 | Liquid crystal display device integrating touch function and touch position detecting method thereof |
| WO2014169520A1 (en) * | 2013-04-16 | 2014-10-23 | 北京京东方光电科技有限公司 | Capacitor touch array substrate, touch display screen and driving method therefor |
| WO2015032107A1 (en) * | 2013-09-06 | 2015-03-12 | 深圳市华星光电技术有限公司 | In cell touch screen and liquid crystal display |
| CN108958090A (en) * | 2017-05-22 | 2018-12-07 | 比亚迪股份有限公司 | Circuit and control method, the household electrical appliance and consumer electronics device of multiplexing port |
| CN109164667A (en) * | 2018-09-03 | 2019-01-08 | 深圳小淼科技有限公司 | A kind of projector |
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Application publication date: 20110216 |