CN202711211U - Touch displaying panel and displaying device - Google Patents
Touch displaying panel and displaying device Download PDFInfo
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- CN202711211U CN202711211U CN 201220389304 CN201220389304U CN202711211U CN 202711211 U CN202711211 U CN 202711211U CN 201220389304 CN201220389304 CN 201220389304 CN 201220389304 U CN201220389304 U CN 201220389304U CN 202711211 U CN202711211 U CN 202711211U
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Abstract
The utility model provides a touch displaying panel and a displaying device and belongs to the field of touch screen displayers. The touch displaying panel comprises an array substrate, wherein multi-strips of grid lines and multi-strips of public electrode wires are arranged on the array substrate. The touch displaying panel further comprises a plurality of optical sensing units, an optical sensing controlling line, an optical sensing signal line and a voltage supplying unit, wherein the optical sensing units, the optical sensing controlling line and the optical sensing signal line are arranged on the array substrate, each of the optical sensing units comprises an optical sensing thin film transistor (TFT), a grid electrode and a drain electrode of each optical sensing TFT are in connection with the optical sensing controlling line, the optical sensing signal line and the optical sensing controlling line are arranged in crossed mode, one end of the optical sensing signal line is in connection with the optical sensing units so that optical sensing signals can be output, and the voltage supplying unit is used for supplying stable voltage for each optical sensing TFT through the optical sensing controlling line. According to the technical scheme of the touch displaying panel and the displaying device, touching accuracy and veracity can be improved.
Description
Technical field
The utility model relates to the touch-screen display field, refers to especially a kind of touch display panel and display device.
Background technology
Divide according to principle, touch-screen comprises following several substantially: resistive touch screen, capacitive touch screen, infrared-type touch-screen, surface acoustic wave touch screen, electromagnetical type touch screen, ripple induction type touch-screen, frustrated total internal reflection optical induction type etc. shake.According to forming structure, touch-screen is divided into: external hanging type touch-screen (bilayer), touch sensing coverage rate (individual layer), touch sensing on panel, touch sensing is inner at panel.Along with the market trend of whole module attenuate, the structure of touch-screen is developed to embedded touch-screen by the external hanging type touch-screen, so both can realize that the reduced thickness of touch panel reduces the cost of touch-screen simultaneously.Present embedded touch-screen mainly adopts three kinds of technology: resistance-type, condenser type, optical profile type.Wherein the optical profile type touch sensing has become follow-on main touch sensing technology with its unrestricted on panel size is used, advantage such as the life-span is relatively stable that has.
In the prior art, the optical profile type touch sensing generally adopts optical sensing thin film transistor (TFT) (optical sensing TFT) to respond to light intensity, the grid of optical sensing TFT and source electrode all are to be connected with public electrode wire on the array base palte, because the voltage of public electrode is subject to array base palte and limits, and cannot arbitrarily transfer; And public electrode can be subject to the interference of data signal line in the time of real work, produce certain noise, therefore the voltage of public electrode is not to maintain on the constant DC voltage in practical work process, can bring certain impact to touching precision and Accuracy of Judgement like this.Because optical sensing TFT links to each other with public electrode wire, can affect the stability of voltage on the public electrode wire, thereby cause the spread of voltage on the public electrode, thereby affect the demonstration of pixel simultaneously.
The utility model content
The technical problems to be solved in the utility model provides a kind of touch display panel and display device that public electrode voltages is not exerted an influence.
For solving the problems of the technologies described above, the technical scheme that embodiment of the present utility model provides is as follows:
On the one hand, provide a kind of touch display panel, comprise array base palte, be provided with many grid lines and many public electrode wires on the described array base palte, described touch display panel also comprises:
Be arranged on a plurality of optical sensings unit on the described array base palte, described optical sensing unit comprises optical sensing TFT;
Be arranged on the optical sensing control line on the described array base palte, the grid of described optical sensing TFT is connected with described optical sensing control line with drain electrode;
Be arranged on the optical sensor signal line on the described array base palte, arranged in a crossed manner with described optical sensing control line, described optical sensor signal line one end is connected with described optical sensing unit, is used for the output optical sensor signal;
The voltage feed unit of burning voltage is provided for described optical sensing TFT by described optical sensing control line.
Further, described voltage feed unit for the magnitude of voltage that described optical sensing TFT provides is-8V ~ 20V.
Further, the magnitude of voltage that provides for described optical sensing TFT under optical sensing TFT opening of described voltage feed unit is 1V ~ 10V.
Further, described optical sensing control line and described grid line arrange with layer.
Further, also be provided with many data lines on the described array base palte, described grid line and described data line enclose the formation sub-pixel, interval 3 ~ 8 row sub-pixels between described adjacent two optical sensing control lines.
Further, described touch display panel also comprises the touch location decision circuitry, is connected with described optical sensor signal line also to judge touch location according to the signal that receives.
Further, described optical sensing unit also comprises:
Gauge tap is for the output of the electric signal of controlling described optical sensing TFT.
Further, interval 4 ~ 10 row sub-pixels between described two adjacent optical sensor signal lines.
Further, described gauge tap is thin film transistor (TFT);
The grid of described gauge tap is connected with described grid line, and the source electrode of described gauge tap is connected with described optical sensor signal line, and the drain electrode of described gauge tap is connected with the source electrode of described optical sensing TFT.
The utility model embodiment also provides a kind of display device, comprises aforesaid touch display panel.
Embodiment of the present utility model has following beneficial effect:
In the such scheme, the voltage of optical sensing TFT is provided by the optical sensing control line of independent setting, and the optical sensing control line provides stable voltage for optical sensing TFT, therefore can improve to touch precision and accuracy.Simultaneously, because the voltage of optical sensing TFT no longer is connected with public electrode wire, therefore can not affect the stability of public electrode voltages.Simultaneously, can regulate optimization to the electric signal that the optical sensing unit outputs to the optical sensor signal line by the voltage of regulating on the optical sensing control line.
Description of drawings
Fig. 1 is the circuit diagram of the voltage feed unit of the utility model embodiment;
Fig. 2 is the schematic diagram that concerns between the voltage of optical sensing control line and the TFT electric current;
Fig. 3 be a-si TFT grid when linking to each other with source electrode the light leakage current under the different light intensity change schematic diagram;
Fig. 4 is the circuit diagram of the touch display panel of the utility model embodiment.
Embodiment
For technical matters, technical scheme and advantage that embodiment of the present utility model will be solved is clearer, be described in detail below in conjunction with the accompanying drawings and the specific embodiments.
Embodiment of the present utility model is to be connected with the public electrode wire of array base palte for the grid of optical sensing TFT with source electrode, can exert an influence to the stability of voltage on the public electrode wire this moment, thereby cause the spread of voltage on the public electrode, affect the display effect of pixel.The utility model provides a kind of touch display panel and display device that can not exert an influence to public electrode voltages.
The touch display panel of the utility model embodiment comprises array base palte, is provided with many grid lines and many public electrode wires on this array base palte, and this touch display panel also comprises:
Be arranged on a plurality of optical sensings unit on the array base palte, the optical sensing unit comprises optical sensing TFT;
Be arranged on the optical sensing control line on the array base palte, the grid of optical sensing TFT is connected with the optical sensing control line with drain electrode; Optical sensing TFT is used for reception environment light or other add the light of light source, and produces electric signal; Above-mentioned optical sensing TFT specifically can receive external light source by in the position corresponding with the optical sensitive zone of optical sensing TFT opening being set.In the touch display panel of reality, the top of gauge tap and optical sensor signal line is provided with light shield layer, such as black matrix B M; Optical sensing TFT top then need not to arrange light shield layer, with the variation that guarantees that optical sensing TFT can sense extraneous light intensity in real time;
Be arranged on the optical sensor signal line on the array base palte, arranged in a crossed manner with the optical sensing control line, optical sensor signal line one end is connected with the optical sensing unit, is used for the output optical sensor signal;
Provide the voltage feed unit of burning voltage for optical sensing TFT by the optical sensing control line, the size of unlatching, shutoff or the generation electric signal of voltage feed unit control optical sensing TFT.
Further, touch display panel also comprises the touch location decision circuitry, is connected with the optical sensor signal line also to judge touch location according to the signal that receives.
Traditional sub-pixel structure is controlled the pixel charging together by a grid line, a source signal line (being data line) and a TFT switch (pixel gauge tap).When the capable grid line of N is high level, the TFT switch opens, source signal line (data line) signal is input to the signal of needs output above the pixel electrode by TFT switch (pixel gauge tap), thereby reaches display effect.Finish the charging process of the capable pixel of whole N this moment.The voltage of other moment N grid lines is low level, and the TFT switch is in closed condition.On the pixel electrode electric charge by and public electrode form memory capacitance, keep certain electric charge until during next frame grid line be that high level charges again.In the sub-pixel structure of traditional array substrate, the data line parallel longitudinal is arranged, and each row sub-pixel is equipped with a data line, and the equal arrangement in a row of grid line and public electrode wire is also parallel to each other, and every delegation sub-pixel is equipped with a grid line and public electrode wire.
In the design of traditional optical touch, the grid of the optical sensing TFT of optical sensing unit and drain electrode all link to each other with public electrode wire on the array base palte, by the Control of Voltage of public electrode wire.Its public electrode wire provides voltage (scope is between 2V-5V) for public electrode after a display panels is made.Because the voltage on the public electrode wire is subject to the impact such as pixel electrode voltage etc., therefore noise can appear, can not keep a stable magnitude of voltage, thereby cause the decline that touches precision and accuracy, simultaneously, because the grid of optical sensing TFT all is connected with public electrode wire with drain electrode, can cause dividing potential drop to the voltage on the public electrode wire, affect the stability of voltage on the public electrode wire, thereby affect the display effect of voltage and the display panel of public electrode.This programme utilizes this optical sensing control line to come for optical sensing TFT provides voltage by increasing an independent optical sensing control line, thereby when improving the touch precision, can the stability of the voltage on the public electrode not impacted.
Because the optical sensor device of optical sensing unit is comprised of thin film transistor (TFT) (TFT), the sensitivity of optical sensor device and the power of transducing signal are mainly determined by the TFT characteristic.According to the self character of TFT, the power that affects the TFT signal transmission mainly is that the size of TFT and the grid of TFT are executed alive size.Apply in the certain situation of voltage in the size of TFT and the grid of TFT, different light intensity shows different TFT characteristic (current value that TFT opens increases along with the light intensity increase), the difference that namely shows signal transmission changes, and just can determine according to the variation of TFT signal transmission under different sensitization conditions the touch point of liquid crystal panel.Because traditional optical touches in the design, the grid of optical sensing TFT links to each other with public electrode wire, so the grid voltage of optical sensing TFT is unfavorable for the condition optimizing of optical sensor signal.In a single day liquid crystal panel is opened simultaneously, just be applied with the voltage identical with public electrode on the public electrode wire of liquid crystal panel the inside, optical sensing TFT is also in running order when not touching like this, and therefore traditional optical touch design can increase the power consumption of liquid crystal panel greatly.The utility model is than traditional optical touch design, line of special increase is as the optical sensing control line on array base palte, for the optical sensing TFT in the optical sensing unit provides voltage, by the voltage swing of control optical sensing control line, thereby the touch sensible of transducing signal is optimized.
The voltage feed unit can be according to actual needs arranges the voltage of optical sensing control line, and such as when not needing the optical sensing cell operation, the voltage of optical sensing control line is set to-8V.Be illustrated in figure 1 as the circuit diagram of voltage feed unit, the voltage V=AVDD*R2/ (R1+R2) that the voltage feed unit provides, wherein the value of AVDD is fixed, and can control voltage V by regulating resistance R2.The voltage feed unit can pass through the PCB(printed circuit board (PCB)) realize, can be arranged on the array base palte, also can be independent of outside the array base palte.
Preferably, the voltage feed unit is that the voltage that optical sensing TFT applies is-8V ~ 20V in this voltage range, can control unlatching, shutoff and the work of optical sensing TFT.Be illustrated in figure 2 as the schematic diagram that concerns between the voltage V of optical sensing control line and the TFT electric current, can find out the electric current that to adjust optical sensing TFT by the voltage of voltage feed unit change optical sensing control line, for optical sensing TFT, when not needing to touch, can be transferred to the voltage of optical sensing control line-8V about, this moment, optical sensing TFT was in off position substantially.When needs optical sensing TFT works, can be according to the requirement to sensitivity, regulate the intensity that the voltage V of optical sensing control line regulates optical sensing by the voltage feed unit.
More preferably, the voltage feed unit is that the operating voltage that optical sensing TFT applies is 1V ~ 10V, in this scope, can guarantee that the detector in the touch location decision circuitry can detect the variation of signal, to obtain to touch preferably precision.
Concrete, the optical sensing unit also comprises: gauge tap, be used for the output of the electric signal of control optical sensing TFT, and an end is connected with the optical sensor signal line; The optical sensor signal line is arranged on the array base palte and arranged in a crossed manner with the optical sensing control line, and an end is connected with the touch location decision circuitry, is used for electric signal transmission to the touch location decision circuitry.
Particularly, optical sensing TFT and gauge tap all can adopt thin film transistor (TFT) to realize.Optical sensing TFT can be formed by a larger thin film transistor (TFT) of size, and the active layer in this thin film transistor (TFT) can adopt to the more sensitive semiconductor material of beam intensity ratio, such as amorphous silicon a-Si.Light leakage current when the grid that is illustrated in figure 3 as a-SiTFT links to each other with source electrode under the different light intensity can be found out, along with the variation of light intensity, the light leakage current of a-Si TFT also changes thereupon.The opening that above-mentioned optical sensing TFT top does not arrange light shield layer can be the channel region that corresponds to above-mentioned optical sensing TFT; When ambient light shone active layer by the TFT channel region, the charge carrier in the active layer of above-mentioned optical sensing TFT was subject to exciting the generation light leakage current.
Optical sensing TFT is the main devices of optical sensing unit, and Fig. 4 is the circuit diagram of the touch display panel of the utility model embodiment, and wherein, 1 is data line, and 2 is public electrode wire.As shown in Figure 4, optical sensing TFT(Photo TFT) grid is connected with optical sensing control line 5 with drain electrode, and the source electrode of optical sensing TFT is connected with the drain electrode of gauge tap (Readout TFT); Gauge tap can be formed by a smaller thin film transistor (TFT) of size, the grid of gauge tap is connected with grid line 3, the drain electrode of gauge tap is connected with the source electrode of optical sensing TFT, the source electrode of gauge tap is connected with optical sensor signal line 4, the lateral coordinates of touch point can be oriented by the opening time of this gauge tap, the along slope coordinate of touch point can be oriented by optical sensor signal line 4.
The most basic principle of optical touch sensing is when finger touch shines a certain zone of display panel to display panel or with laser pen, and the different light intensity of optical sensing unit induction of display panel shows different qualities, thereby exports different electric signal.
Particularly, under normal surround lighting, can produce stable light leakage current among the optical sensing TFT in the above-mentioned touch display panel, optical sensing TFT also is stable to the electric signal of gauge tap transmission.When finger touch arrived display panel, the light that the optical sensing TFT in the touch point institute overlay area receives died down, and the light leakage current that produces among the optical sensing TFT diminishes, and correspondingly the electric signal of optical sensing TFT output also dies down; When laser pen etc. added the light source irradiation display panel, the light grow that the optical sensing TFT in the irradiation area receives, the light leakage current that produces among the optical sensing TFT became large, correspondingly also grow of the electric signal of optical sensing TFT output.
When gauge tap was opened, the electric signal of above-mentioned output was delivered to the touch location decision circuitry by optical sensor signal line 4; The touch location decision circuitry receives the electric signal of optical sensing unit output, by the Strength Changes situation of the electric signal that receives and situation that grid line 3 is opened being processed to judge the position of touch point, afterwards the position feedback of the touch point signal processing enter to touch display panel is triggered.
As shown in Figure 4, when finger or laser pen when touching display panel, the light intensity that places the surround lighting that receives of the opening part on the optical sensing unit or add light source is changed owing to stopping, cause optical sensing TFT(Photo TFT) light leakage current change, thereby because the variation of light leakage current causes the change in voltage of Cst2.When grid line 3 passed into the grid start signal in the overlay area, touch point, gauge tap was also opened thereupon, and the signal of variation arrives optical sensor signal line 4 by gauge tap (Readout TFT); Optical sensor signal line 4 is processed electrical signal transfer to the touch location decision circuitry, processed by the intensity to this electric signal by the touch location decision circuitry, judges the position of touch point according to the RST of grid line 3 again.
In the utility model, the optical sensing unit can be on array base palte arrangement in a row, also can become row to arrange at array base palte, perhaps become matrix to arrange at array base palte.Particularly, be provided with many data lines on the array base palte, grid line 3 and data line 1 enclose the formation sub-pixel, can interval 3 ~ 8 row sub-pixels between adjacent two optical sensing control lines 5.Further, can also interval 4 ~ 10 row sub-pixels between two adjacent optical sensor signal lines 4.Specifically can suitably change according to actual conditions (such as the requirement to power consumption or touch precision) arrangement mode and the quantity of optical sensing unit and optical sensor signal line 4.
The optical sensing unit of touch display panel of the present utility model comprises optical sensing TFT, the voltage of optical sensing TFT is provided by the optical sensing control line 5 of independent setting, by the voltage that applies on the optical sensing control line 5 can be optimized the signal that the optical sensing unit outputs to optical sensor signal line 4, reduce the power consumption of touch display panel, and can guarantee precision and the accuracy of optical touch.
The utility model embodiment also provides a kind of display device, comprises aforesaid touch display panel.This display device can for: liquid crystal panel, Electronic Paper, oled panel, LCD TV, liquid crystal display, digital album (digital photo frame), mobile phone, panel computer etc. have product or the parts of any Presentation Function.
The utility model embodiment also provides a kind of preparation method who makes above-mentioned touch display panel, may further comprise the steps:
Wherein, the grid of gauge tap (Readout TFT) links to each other with grid line, perhaps also can directly be served as by grid line.
Utilize same mask(mask plate) make the scheme that metal layer pattern is leaked in active layer and source, belonged to for a person skilled in the art routine techniques, repeat no more herein.
In the step 2, the source electrode of optical sensing TFT is connected with the drain electrode of gauge tap, and perhaps the drain electrode of the source electrode of optical sensing TFT and gauge tap is into a single integrated structure; Simultaneously, the source electrode of gauge tap is connected with the optical sensor signal line.
The preparation method of making touch display panel of the present utility model does not need to increase composition technique, adopts can the complete array base palte of touch display panel of four composition technique.
In the above-described embodiments, all be take TN type array base palte as example, introduce the touch display panel in the utility model; For for the in-cell touch display panel of VA type, IPS type, ADS type array base palte; can be suitable for the scheme that provides among the utility model embodiment equally, therefore the touch display panel based on type of drive array base paltes such as VA type, IPS type, ADS types all should belong to protection domain of the present utility model.
The above is preferred implementation of the present utility model; should be understood that; for those skilled in the art; under the prerequisite that does not break away from principle described in the utility model; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (10)
1. a touch display panel comprises array base palte, is provided with many grid lines and many public electrode wires on the described array base palte, it is characterized in that, described touch display panel also comprises:
Be arranged on a plurality of optical sensings unit on the described array base palte, described optical sensing unit comprises optical sensing TFT;
Be arranged on the optical sensing control line on the described array base palte, the grid of described optical sensing TFT is connected with described optical sensing control line with drain electrode;
Be arranged on the optical sensor signal line on the described array base palte, arranged in a crossed manner with described optical sensing control line, described optical sensor signal line one end is connected with described optical sensing unit, is used for the output optical sensor signal;
The voltage feed unit of burning voltage is provided for described optical sensing TFT by described optical sensing control line.
2. touch display panel according to claim 1 is characterized in that, described voltage feed unit for the magnitude of voltage that described optical sensing TFT provides is-8V ~ 20V.
3. touch display panel according to claim 2 is characterized in that, the magnitude of voltage that described voltage feed unit provides for described optical sensing TFT under optical sensing TFT opening is 1V ~ 10V.
4. touch display panel according to claim 1 is characterized in that, described optical sensing control line and described grid line arrange with layer.
5. touch display panel according to claim 1, it is characterized in that, also be provided with many data lines on the described array base palte, described grid line and described data line enclose the formation sub-pixel, interval 3 ~ 8 row sub-pixels between described adjacent two optical sensing control lines.
6. touch display panel according to claim 1 is characterized in that, described touch display panel also comprises the touch location decision circuitry, is connected with described optical sensor signal line also to judge touch location according to the signal that receives.
7. described touch display panel according to claim 6 is characterized in that, described optical sensing unit also comprises:
Gauge tap is for the output of the electric signal of controlling described optical sensing TFT.
8. touch display panel according to claim 7 is characterized in that, interval 4 ~ 10 row sub-pixels between described two adjacent optical sensor signal lines.
9. touch display panel according to claim 7 is characterized in that, described gauge tap is thin film transistor (TFT);
The grid of described gauge tap is connected with described grid line, and the source electrode of described gauge tap is connected with described optical sensor signal line, and the drain electrode of described gauge tap is connected with the source electrode of described optical sensing TFT.
10. a display device is characterized in that, comprises such as each described touch display panel among the claim 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220389304 CN202711211U (en) | 2012-08-07 | 2012-08-07 | Touch displaying panel and displaying device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220389304 CN202711211U (en) | 2012-08-07 | 2012-08-07 | Touch displaying panel and displaying device |
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| CN202711211U true CN202711211U (en) | 2013-01-30 |
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| CN 201220389304 Expired - Fee Related CN202711211U (en) | 2012-08-07 | 2012-08-07 | Touch displaying panel and displaying device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102830857A (en) * | 2012-08-07 | 2012-12-19 | 京东方科技集团股份有限公司 | Touch display panel and preparation method thereof as well as display device |
| CN103699264A (en) * | 2013-12-24 | 2014-04-02 | 京东方科技集团股份有限公司 | Touch circuit, touch substrate and touch display device |
| CN104393024A (en) * | 2014-12-03 | 2015-03-04 | 京东方科技集团股份有限公司 | OLED pixel structure as well as preparation method, ultraviolet light detection method and ultraviolet light detection device thereof |
| CN104731426A (en) * | 2013-12-20 | 2015-06-24 | 乐金显示有限公司 | Display device integrated with touch screen panel and method of driving the same |
-
2012
- 2012-08-07 CN CN 201220389304 patent/CN202711211U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102830857A (en) * | 2012-08-07 | 2012-12-19 | 京东方科技集团股份有限公司 | Touch display panel and preparation method thereof as well as display device |
| CN102830857B (en) * | 2012-08-07 | 2016-01-20 | 京东方科技集团股份有限公司 | Touch display panel and preparation method thereof, display device |
| CN104731426A (en) * | 2013-12-20 | 2015-06-24 | 乐金显示有限公司 | Display device integrated with touch screen panel and method of driving the same |
| CN104731426B (en) * | 2013-12-20 | 2017-12-19 | 乐金显示有限公司 | It is integrated with the display device and its driving method of touch panel |
| CN103699264A (en) * | 2013-12-24 | 2014-04-02 | 京东方科技集团股份有限公司 | Touch circuit, touch substrate and touch display device |
| CN104393024A (en) * | 2014-12-03 | 2015-03-04 | 京东方科技集团股份有限公司 | OLED pixel structure as well as preparation method, ultraviolet light detection method and ultraviolet light detection device thereof |
| CN104393024B (en) * | 2014-12-03 | 2017-04-12 | 京东方科技集团股份有限公司 | OLED pixel structure as well as preparation method, ultraviolet light detection method and ultraviolet light detection device thereof |
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