CN102830857A - Touch display panel and preparation method thereof as well as display device - Google Patents

Touch display panel and preparation method thereof as well as display device Download PDF

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Publication number
CN102830857A
CN102830857A CN2012102797071A CN201210279707A CN102830857A CN 102830857 A CN102830857 A CN 102830857A CN 2012102797071 A CN2012102797071 A CN 2012102797071A CN 201210279707 A CN201210279707 A CN 201210279707A CN 102830857 A CN102830857 A CN 102830857A
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CN
China
Prior art keywords
optical sensing
display panel
tft
touch display
optical
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CN2012102797071A
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Chinese (zh)
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CN102830857B (en
Inventor
徐宇博
胡明
林炳仟
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京东方科技集团股份有限公司
合肥京东方光电科技有限公司
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Priority to CN201210279707.1A priority Critical patent/CN102830857B/en
Publication of CN102830857A publication Critical patent/CN102830857A/en
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Publication of CN102830857B publication Critical patent/CN102830857B/en

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Abstract

The invention provides a touch display panel and a preparation method thereof as well as a display device, belonging to the field of a touch screen display. The touch display panel comprises an array substrate and the array substrate is provided with a plurality of grid wires and a plurality of public electrode wires; the touch display panel further comprises a plurality of optical sensing units arranged on the array substrate, an optical sensing control wire arranged on the array substrate, an optical sensing signal wire arranged on the array substrate and a voltage supply unit, wherein each optical sensing unit comprises an optical sensing TFT (Thin Film Transistor); a grid electrode and a drain electrode of the optical sensing TFT are connected with the optical sensing control wire; the optical sensing signal wire is crossly arranged with the optical sensing control wire; one end of the optical sensing signal wire is connected with the optical sensing units and is used for outputting an optical sensing signal; and the voltage supply unit is used for providing stable voltage to the optical sensing TFT through the optical sensing control wire. The technical scheme disclosed by the invention can improve touch precision and accuracy.

Description

Touch display panel and preparation method thereof, display device

Technical field

The present invention relates to the touch-screen display field, be meant a kind of touch display panel and preparation method thereof, display device especially.

Background technology

Divide according to principle, touch-screen comprises following several kinds substantially: resistive touch screen, capacitive touch screen, infrared-type touch-screen, surface acoustic wave type 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 be with array base palte on public electrode wire be connected; Because the voltage of public electrode receives array base palte and limits, and cannot arbitrarily transfer; And public electrode can receive 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 a constant DC to press in practical work process, can bring certain influence to the accuracy that touches precision and judgement like this.Because optical sensing TFT links to each other with public electrode wire, can influence the stability of voltage on the public electrode wire, thereby cause the spread of voltage on the public electrode, thereby influence the demonstration of pixel simultaneously.

Summary of the invention

The technical matters that the present invention will solve provides a kind of touch display panel that public electrode voltages is not exerted an influence and preparation method thereof, display device.

For solving the problems of the technologies described above, the technical scheme that embodiments of the invention provide is following:

On the one hand, a kind of touch display panel is provided, comprises array base palte, said array base palte is provided with many grid lines and many public electrode wires, and said touch display panel also comprises:

Be arranged on a plurality of optical sensings unit on the said array base palte, said optical sensing unit comprises optical sensing TFT;

Be arranged on the optical sensing control line on the said array base palte, the grid of said optical sensing TFT is connected with said optical sensing control line with drain electrode;

Be arranged on the optical sensor signal line on the said array base palte, arranged in a crossed manner with said optical sensing control line, said optical sensor signal line one end is connected with said optical sensing unit, is used to export optical sensor signal;

Through said optical sensing control line is the voltage feed unit that said optical sensing TFT provides burning voltage.

Further, said voltage feed unit is that the magnitude of voltage that said optical sensing TFT provides is-8V ~ 20V.

Further, the magnitude of voltage that under optical sensing TFT opening, provides for said optical sensing TFT of said voltage feed unit is 1V ~ 10V.

Further, said optical sensing control line and said grid line are provided with layer.

Further, also be provided with many data lines on the said array base palte, said grid line and said data line enclose the formation sub-pixel, interval 3 ~ 8 row sub-pixels between said adjacent two optical sensing control lines.

Further, said touch display panel also comprises the touch location decision circuitry, is connected with said optical sensor signal line also to judge touch location according to the signal that receives.

Further, said optical sensing unit also comprises:

CS is used to control the output of the electric signal of said optical sensing TFT.

Further, interval 4 ~ 10 row sub-pixels between said two adjacent optical sensor signal lines.

Further, said CS is a thin film transistor (TFT);

The grid of said CS is connected with said grid line, and the source electrode of said CS is connected with said optical sensor signal line, and the drain electrode of said CS is connected with the source electrode of said optical sensing TFT.

The embodiment of the invention also provides a kind of preparation method of touch display panel, comprising:

On array base palte, form grid line and optical sensing control line through a composition technology.

The embodiment of the invention also provides a kind of display device, comprises aforesaid touch display panel.

Embodiments of the invention have 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 influence 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 through 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 embodiment of the invention;

Fig. 2 is the synoptic diagram that concerns between voltage and the TFT electric current of optical sensing control line;

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 synoptic diagram;

Fig. 4 is the circuit diagram of the touch display panel of the embodiment of the invention.

Embodiment

For technical matters, technical scheme and advantage that embodiments of the invention will be solved is clearer, will combine accompanying drawing and specific embodiment to be described in detail below.

Embodiments of the invention all are to be connected with the public electrode wire of array base palte to the grid of optical sensing TFT with source electrode; This moment, the stability to voltage on the public electrode wire can exert an influence; Thereby cause the spread of voltage on the public electrode, influence the display effect of pixel.The present invention provides a kind of touch display panel that can not exert an influence to public electrode voltages and preparation method thereof, display device.

The touch display panel of the embodiment of the invention comprises array base palte, and this array base palte is provided with many grid lines and many public electrode wires, 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 be through receiving external light source with corresponding position, the optical sensitive of optical sensing TFT zone opening being set.In the touch display panel of reality, the top of CS 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 be provided with light shield layer, can sense extraneous intensity variations in real time to guarantee optical sensing TFT;

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 to export optical sensor signal;

For optical sensing TFT the voltage feed unit of burning voltage is provided through the optical sensing control line, unlatching, the shutoff of voltage feed unit control optical sensing TFT or produce the size of electric signal.

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 CS).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 through TFT switch (pixel CS), thereby reaches display effect.Accomplish 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.Electric charge is through forming MM CAP with public electrode on the pixel electrode, and keeping certain electric charge grid line when next frame is 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 grid line and public electrode wire are all embarked on journey and arranged and parallel to each other, and each capable sub-pixel is equipped with a grid line and public electrode wire.

Traditional optical touches in the design, the grid of the optical sensing TFT of optical sensing unit and drain electrode all with array base palte on public electrode wire link to each other, by the Control of Voltage of public electrode wire.Its public electrode wire is that public electrode provides voltage (scope is between 2V-5V) after a display panels is processed.Because the voltage on the public electrode wire receives the influence like pixel electrode voltage etc., therefore noise can occur, 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; Influence the stability of voltage on the public electrode wire, thereby influence the display effect of the voltage and the display panel of public electrode.This programme utilizes this optical sensing control line to come for optical sensing TFT provides voltage through 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 made up 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 influences the TFT transmission signals mainly is the size that the grid of size and the TFT of TFT applies voltage.Apply under 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 promptly shows transmission signals changes, and just can confirm the touch point of liquid crystal panel according to the variation of TFT transmission signals under different sensitization conditions.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 on the public electrode wire of liquid crystal panel the inside with public electrode; Optical sensing TFT is also in running order when not touching like this, so traditional optical touches the power consumption that design can increase liquid crystal panel greatly.The present invention touches design than traditional optical; 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; Through 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 be provided with 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 through regulating resistance R 2.The voltage feed unit can pass through PCB (printed circuit board (PCB)) to be realized, can be arranged on the array base palte, also can be independent of outside the array base palte.

Preferably, the voltage feed unit is-8V ~ 20V in this voltage range, can control unlatching, shutoff and the work of optical sensing TFT for the voltage that optical sensing TFT applies.Be illustrated in figure 2 as the synoptic diagram that concerns between voltage V and the TFT electric current of optical sensing control line; Can find out the electric current that to adjust optical sensing TFT through the voltage of voltage feed unit change optical sensing control line; For optical sensing TFT; In the time need not touching, can be transferred to the voltage of optical sensing control line-8V about, this moment, optical sensing TFT was in off position basically.When needs optical sensing TFT works, can be according to requirement to sensitivity, regulate the intensity that the voltage V of optical sensing control line regulates optical sensing through the voltage feed unit.

More preferably, the WV that the voltage feed unit applies for optical sensing TFT 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: CS, be used to control the output of the electric signal of 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 is transferred to the touch location decision circuitry.

Particularly, optical sensing TFT and CS all can adopt thin film transistor (TFT) to realize.Optical sensing TFT can be formed by a bigger 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 intensity variations, the light leakage current of a-Si TFT also changes thereupon.The opening that above-mentioned optical sensing TFT top is not provided with light shield layer can be the channel region that corresponds to above-mentioned optical sensing TFT; When ambient light shone active layer through the TFT channel region, the charge carrier in the active layer of above-mentioned optical sensing TFT received and excites 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 embodiment of the invention, and wherein, 1 is data line, and 2 is public electrode wire.As shown in Figure 4, the grid of optical sensing TFT (Photo TFT) 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 CS (Readout TFT); CS can be formed by a smaller thin film transistor (TFT) of size; The grid of CS is connected with grid line 3; The drain electrode of CS is connected with the source electrode of optical sensing TFT; The source electrode of CS is connected with optical sensor signal line 4, can orient the lateral coordinates of touch point through the time of opening of this CS, can orient the along slope coordinate of touch point through 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 CS electrical signal delivered.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 big, correspondingly also grow of the electric signal of optical sensing TFT output.

When CS was opened, the electric signal of above-mentioned output was delivered to the touch location decision circuitry through optical sensor signal line 4; The touch location decision circuitry receives the electric signal of optical sensing unit output; Judge touch point position through the Strength Changes situation of the electric signal that receives and situation that grid line 3 is opened are handled, trigger at the signal Processing center that afterwards touch point position is fed back to touch display panel.

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 the light leakage current of optical sensing TFT (Photo TFT) to change, thereby because the variation of light leakage current cause the change in voltage of Cst2.When grid line 3 fed the grid start signal in the overlay area, touch point, CS was also opened thereupon, and the signal of variation arrives optical sensor signal line 4 through CS (Readout TFT); Optical sensor signal line 4 is handled electrical signal transfer to the touch location decision circuitry, handled through the intensity to this electric signal by the touch location decision circuitry, judges touch point position according to the RST of grid line 3 again.

Among the present invention, the arrangement of can on array base palte, embarking on journey of optical sensing unit also can become row to arrange on array base palte, perhaps on array base palte, becomes arranged.Particularly, array base palte is provided with many data lines, and grid line 3 encloses the formation sub-pixel with data line 1, can interval 3 ~ 8 row sub-pixels between adjacent two optical sensing control lines 5.Further, 4 ~ 10 row sub-pixels at interval between two adjacent optical sensor signal lines 4.Specifically can suitably change the arrangement mode and the quantity of optical sensing unit and optical sensor signal line 4 according to actual conditions (such as the requirement that power consumption is perhaps touched precision).

The optical sensing unit of touch display panel of the present invention comprises optical sensing TFT; The voltage of optical sensing TFT is provided by the optical sensing control line 5 of independent setting; Through 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 the precision and the accuracy of optical touch.

The embodiment of the invention 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, LCD, DPF, mobile phone, panel computer etc. have the product or the parts of any Presentation Function.

The embodiment of the invention also provides a kind of preparation method who makes above-mentioned touch display panel, may further comprise the steps:

Step 1, through the first time composition technology on array base palte, form grid, public electrode wire, grid line and the optical sensing control line of pixel TFT, optical sensing TFT (Photo TFT) and CS (Readout TFT);

Wherein, the grid of CS (Readout TFT) links to each other with grid line, perhaps also can directly be served as by grid line.

Step 2, through the second time composition technology through form gate insulation layer, active layer on the array base palte of step 1 and be positioned at gate insulation layer and active layer above source electrode and drain electrode, data line and the optical sensor signal line of pixel TFT, optical sensing TFT (Photo TFT) and CS (Readout TFT);

Utilize same mask (mask plate) to make the scheme of active layer and source leakage metal layer pattern, belonged to routine techniques for a person skilled in the art, repeat no more here.

In the step 2, the source electrode of optical sensing TFT is connected with the drain electrode of CS, and perhaps the drain electrode of the source electrode of optical sensing TFT and CS is into a single integrated structure; Simultaneously, the source electrode of CS is connected with the optical sensor signal line.

Step 3, through composition technology for the third time through forming the figure of the insulation course that includes the pixel electrode via hole on the array base palte of step 2; The position of this pixel electrode via hole is positioned at the drain electrode top of pixel TFT; Need via hole (via hole) be set in grid (or grid lead wire) and the drain electrode corresponding region of optical sensing TFT (Photo TFT) simultaneously, so that pass through grid and drain electrode that subsequent technique connects optical sensing TFT;

Step 4, on insulation course, obtain the pixel electrode and the connection electrode that form by ITO through the 4th composition technology; Pixel electrode is connected with the drain electrode of pixel TFT through the pixel electrode via hole; The connection electrode that is formed by the ITO material is electrically connected with the drain and gate generation of optical sensing TFT respectively through the via hole above the drain and gate of optical sensing TFT, and then the grid of optical sensing TFT is connected with the optical sensing control line with drain electrode.Said connection electrode is provided with layer with pixel electrode but does not produce any electrical connection.

The preparation method of making touch display panel of the present invention need not increase composition technology, adopts can the complete array base palte of touch display panel of four composition technology.

In the above-described embodiments, all be to be example with TN type array base palte, introduce touch display panel among the present invention and preparation method thereof; For for the in-cell touch display panel of VA type, IPS type, ADS type array base palte; The scheme that can be suitable in the embodiment of the invention equally to be provided, 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 scope of the present invention.

The above is a preferred implementation of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from principle according to the invention; Can also make some improvement and retouching, these improvement and retouching also should be regarded as protection scope of the present invention.

Claims (11)

1. a touch display panel comprises array base palte, and said array base palte is provided with many grid lines and many public electrode wires, it is characterized in that, said touch display panel also comprises:
Be arranged on a plurality of optical sensings unit on the said array base palte, said optical sensing unit comprises optical sensing TFT;
Be arranged on the optical sensing control line on the said array base palte, the grid of said optical sensing TFT is connected with said optical sensing control line with drain electrode;
Be arranged on the optical sensor signal line on the said array base palte, arranged in a crossed manner with said optical sensing control line, said optical sensor signal line one end is connected with said optical sensing unit, is used to export optical sensor signal;
Through said optical sensing control line is the voltage feed unit that said optical sensing TFT provides burning voltage.
2. touch display panel according to claim 1 is characterized in that, said voltage feed unit is that the magnitude of voltage that said optical sensing TFT provides is-8V ~ 20V.
3. touch display panel according to claim 2 is characterized in that, the magnitude of voltage that said voltage feed unit provides for said optical sensing TFT under optical sensing TFT opening is 1V ~ 10V.
4. touch display panel according to claim 1 is characterized in that, said optical sensing control line and said grid line are provided with layer.
5. touch display panel according to claim 1; It is characterized in that; Also be provided with many data lines on the said array base palte, said grid line and said data line enclose the formation sub-pixel, interval 3 ~ 8 row sub-pixels between said adjacent two optical sensing control lines.
6. touch display panel according to claim 1 is characterized in that said touch display panel also comprises the touch location decision circuitry, is connected with said optical sensor signal line also to judge touch location according to the signal that receives.
7. according to the said touch display panel of claim 6, it is characterized in that said optical sensing unit also comprises:
CS is used to control the output of the electric signal of said optical sensing TFT.
8. touch display panel according to claim 7 is characterized in that, interval 4 ~ 10 row sub-pixels between said two adjacent optical sensor signal lines.
9. touch display panel according to claim 7 is characterized in that, said CS is a thin film transistor (TFT);
The grid of said CS is connected with said grid line, and the source electrode of said CS is connected with said optical sensor signal line, and the drain electrode of said CS is connected with the source electrode of said optical sensing TFT.
10. the preparation method of a touch display panel is characterized in that, comprising:
On array base palte, form grid line and optical sensing control line through a composition technology.
11. a display device is characterized in that, comprises like each described touch display panel among the claim 1-9.
CN201210279707.1A 2012-08-07 2012-08-07 Touch display panel and preparation method thereof, display device CN102830857B (en)

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