CN102830857B - Touch display panel and preparation method thereof, display device - Google Patents

Touch display panel and preparation method thereof, display device Download PDF

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Publication number
CN102830857B
CN102830857B CN201210279707.1A CN201210279707A CN102830857B CN 102830857 B CN102830857 B CN 102830857B CN 201210279707 A CN201210279707 A CN 201210279707A CN 102830857 B CN102830857 B CN 102830857B
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China
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optical sensing
described
tft
display panel
touch display
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CN201210279707.1A
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Chinese (zh)
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CN102830857A (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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Abstract

The invention provides a kind of touch display panel and preparation method thereof, display device, belong to touch-screen display field.Wherein, this touch display panel, comprises array base palte, array base palte is provided with many grid lines and many public electrode wires, this touch display panel also comprises: be arranged on the multiple optical sensing unit on array base palte, optical sensing unit comprises optical sensing TFT; Be arranged on the optical sensing control line on array base palte, the grid of optical sensing TFT is connected with optical sensing control line with drain electrode; Be arranged on the optical sensor signal line on array base palte, arranged in a crossed manner with optical sensing control line, optical sensor signal line one end is connected with optical sensing unit, for exporting optical sensor signal; By optical sensing control line for optical sensing TFT provides the voltage feed unit of burning voltage.Technical scheme of the present invention can improve touch precision and accuracy.

Description

Touch display panel and preparation method thereof, display device

Technical field

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

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, shake ripple induction type touch-screen, frustrated total internal reflection optical induction type etc.According to composition structure, touch-screen is divided into: external hanging type touch-screen (bilayer), touch sensing at coverage rate (individual layer), touch sensing on panel, touch sensing is at panel itself.Along with the market trend that overall module is thinning, the structure of touch-screen is developed to In-cell touch panel by external hanging type touch-screen, so both can realize the thinning cost simultaneously reducing touch-screen of thickness of touch panel.Current In-cell touch panel mainly adopts three kinds of technology: resistance-type, condenser type, optical profile type.Wherein unrestricted on panel size uses, the advantage such as the life-span is relatively stable that have with it of optical profile type touch sensing, has become follow-on dominant touch sensing technology.

In prior art, optical profile type touch sensing generally adopts optical sensing thin film transistor (TFT) (optical sensing TFT) to respond to light intensity, grid and the source electrode of optical sensing TFT are all be connected with the public electrode wire on array base palte, voltage due to 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 when real work, produce certain noise, therefore in practical work process, the voltage of public electrode is not maintain in a constant DC voltage, can bring certain impact like this on the accuracy touching precision and judgement.Simultaneously because optical sensing TFT is connected with public electrode wire, the stability of voltage on public electrode wire can be affected, thus cause the spread of voltage on public electrode, thus affect the display of pixel.

Summary of the invention

The technical problem to be solved in the present invention is to provide a kind of to touch display panel that public electrode voltages does not have an impact 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 as follows:

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

Be arranged on the multiple optical sensing unit on described array base palte, described optical sensing unit comprises optical sensing TFT;

Be arranged on the optical sensing control line on 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 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, for exporting optical sensor signal;

By described optical sensing control line for described optical sensing TFT provides the voltage feed unit of burning voltage.

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

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

Further, described optical sensing control line and described grid line are arranged with layer.

Further, described array base palte is also provided with a plurality of data lines, described grid line and described data line enclose formation sub-pixel, interval 3 ~ 8 row sub-pixel between described adjacent two optical sensing control lines.

Further, described touch display panel also comprises touch location decision circuitry, is connected and judges touch location according to the signal received with described optical sensor signal line.

Further, described optical sensing unit also comprises:

Gauge tap, for controlling the output of the electric signal of described optical sensing TFT.

Further, interval 4 ~ 10 row sub-pixel 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 embodiment of the present invention additionally provides a kind of preparation method of touch display panel, comprising:

On array base palte, grid line and optical sensing control line is formed by a patterning processes.

The embodiment of the present invention additionally provides a kind of display device, comprises touch display panel as above.

Embodiments of the invention have following beneficial effect:

In such scheme, the voltage of optical sensing TFT is provided by the optical sensing control line arranged separately, and optical sensing control line provides stable voltage for optical sensing TFT, touches precision and accuracy therefore, it is possible to improve.Meanwhile, because the voltage of optical sensing TFT is no longer connected with public electrode wire, the stability of public electrode voltages can not therefore be affected.Meanwhile, by regulating the voltage on optical sensing control line can carry out adjustments optimization to the electric signal that optical sensing unit outputs to optical sensor signal line.

Accompanying drawing explanation

Fig. 1 is the circuit diagram of the voltage feed unit of the embodiment of the present invention;

Fig. 2 is the relation schematic diagram between the voltage of optical sensing control line and TFT electric current;

Fig. 3 is the light leakage current change schematic diagram of a-siTFT grid when being connected with source electrode under different light intensity;

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

Embodiment

For embodiments of the invention will be solved technical matters, technical scheme and advantage clearly, be described in detail below in conjunction with the accompanying drawings and the specific embodiments.

Embodiments of the invention are all be connected with the public electrode wire of array base palte for the grid of optical sensing TFT with source electrode, now can have an impact to the stability of voltage on public electrode wire, thus cause the spread of voltage on public electrode, affect the display effect of pixel.The invention provides a kind of can not to touch display panel that public electrode voltages has an impact and preparation method thereof, display device.

The touch display panel of the embodiment of the present invention, comprises array base palte, and this array base palte is provided with many grid lines and many public electrode wires, this touch display panel also comprises:

Be arranged on the multiple optical sensing unit on array base palte, optical sensing unit comprises optical sensing TFT;

Be arranged on the optical sensing control line on array base palte, the grid of optical sensing TFT is connected with optical sensing control line with drain electrode; Optical sensing TFT, for the light of reception environment light or other additional light sources, and produces electric signal; Above-mentioned optical sensing TFT specifically can be arranged opening and receive external light source by the position corresponding in the optical sensitive region with optical sensing TFT.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; Then without the need to arranging light shield layer above optical sensing TFT, to ensure that optical sensing TFT can sense the change of extraneous light intensity in real time;

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

By optical sensing control line for optical sensing TFT provides the voltage feed unit of burning voltage, the unlatching of voltage feed unit control both optical sensing TFT, shutoff or produce the size of electric signal.

Further, touch display panel also comprises touch location decision circuitry, is connected and judges touch location according to the signal received with optical sensor signal line.

Traditional sub-pixel structure controls pixel together by a grid line, a source signal line (i.e. data line) and a TFT switch (pixel gauge tap) and charges.When N-th row grid line is high level, TFT switch opens, source signal line (data line) signal is input to above pixel electrode needing the signal exported by TFT switch (pixel gauge tap), thus reaches display effect.Now complete the charging process of whole N-th row pixel.The voltage of other moment N grid lines is low level, and TFT switch is in closed condition.On pixel electrode electric charge by and public electrode formed memory capacitance, keep certain electric charge until next frame time grid line be that high level charges again.In the sub-pixel structure of traditional array substrate, the parallel longitudinal arrangement of data line, each row sub-pixel is equipped with a data line, and grid line and the equal arrangement in a row of public electrode wire are also parallel to each other, and every a line sub-pixel is equipped with a grid line and public electrode wire.

In traditional optical touch design, the grid of the optical sensing TFT of optical sensing unit is all connected with the public electrode wire on array base palte, by the Control of Voltage of public electrode wire with drain electrode.After one piece of display panels is made, its public electrode wire provides voltage (scope is between 2V-5V) for public electrode.Because the voltage on public electrode wire is subject to the impact as pixel electrode voltage etc., therefore there will be noise, a stable magnitude of voltage can not be maintained, thus cause the decline touching precision and accuracy, meanwhile, because the grid of optical sensing TFT is all connected with public electrode wire with drain electrode, dividing potential drop can be caused to the voltage on public electrode wire, affect the stability of voltage on public electrode wire, thus affect the voltage of public electrode and the display effect of display panel.This programme, by the independent optical sensing control line of increase by, utilizes this optical sensing control line to provide voltage for optical sensing TFT, thus while raising touches precision, can not impact the stability of the voltage on public electrode.

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 determine primarily of TFT characteristic.According to the self character of TFT, mainly the size of TFT and the grid of TFT execute alive size to affect the power of TFT signal transmission.When the grid of the size of TFT and TFT apply voltage certain, different light intensity shows different TFT characteristics (current value that TFT opens increases along with light intensity increase), namely show the difference change of signal transmission, just can determine the touch point of liquid crystal panel according to the change of TFT signal transmission under different photosensitive conditions.Because traditional optical touches in design, the grid of optical sensing TFT is connected with public electrode wire, and therefore the grid voltage of optical sensing TFT is unfavorable for the condition optimizing of optical sensor signal.Liquid crystal panel is once open simultaneously, public electrode wire inside liquid crystal panel is just applied with the voltage identical with public electrode, such optical sensing TFT is also in running order when not occurring to touch, and therefore traditional optical touch design can increase the power consumption of liquid crystal panel greatly.The present invention designs compared to traditional optical touch, on array base palte, a special increase line is as optical sensing control line, for the optical sensing TFT in optical sensing unit provides voltage, by the voltage swing of control both optical sensing control line, thus the touch sensible of transducing signal is optimized.

Voltage feed unit can be arranged the voltage of optical sensing control line according to actual needs, such as when not needing optical sensing unit to work, the voltage of optical sensing control line is set to-8V.Be illustrated in figure 1 the circuit diagram of voltage feed unit, the voltage V=AVDD*R2/ (R1+R2) that voltage feed unit provides, wherein the value of AVDD is fixing, can control voltage V by regulating resistance R2.Voltage feed unit can pass through PCB(printed circuit board (PCB)) realize, can be arranged on array base palte, also can independent of outside array base palte.

Preferably, voltage feed unit is the voltage that optical sensing TFT applies is-8V ~ 20V, in this voltage range, can the unlatching of control both optical sensing TFT, shutoff and work.Be illustrated in figure 2 the relation schematic diagram between the voltage V of optical sensing control line and TFT electric current, can find out that the voltage by voltage feed unit change optical sensing control line can adjust the electric current of optical sensing TFT, for optical sensing TFT, when not needing the voltage of optical sensing control line can be transferred to about-8V when touching, now optical sensing TFT is in off position substantially.When needs optical sensing TFT works, can, according to the requirement to sensitivity, the voltage V of optical sensing control line be regulated to regulate the intensity of optical sensing by voltage feed unit.

More preferably, voltage feed unit is the operating voltage that optical sensing TFT applies is 1V ~ 10V, within the scope of this, can ensure that the detector in touch location decision circuitry can detect the change of signal, touch precision preferably to obtain.

Concrete, optical sensing unit also comprises: gauge tap, and for the output of the electric signal of control both optical sensing TFT, one end is connected with optical sensor signal line; Optical sensor signal line, to be arranged on array base palte and arranged in a crossed manner with optical sensing control line, and one end is connected with touch location decision circuitry, for by electric signal transmission to 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 the thin film transistor (TFT) that size is larger, and the active layer in this thin film transistor (TFT) can adopt the more sensitive semiconductor material of beam intensity ratio, such as amorphous silicon a-Si.The light leakage current when grid being illustrated in figure 3 a-SiTFT is connected with source electrode under different light intensity, can find out, along with the change of light intensity, the light leakage current of a-SiTFT also changes thereupon.The opening not arranging light shield layer above above-mentioned optical sensing TFT can be the channel region corresponding to above-mentioned optical sensing TFT; When ambient light is irradiated to active layer by TFT channel region, the charge carrier in the active layer of above-mentioned optical sensing TFT is subject to exciting 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 present invention, and wherein, 1 is data line, and 2 is public electrode wire.As shown in Figure 4, optical sensing TFT(PhotoTFT) grid be connected with optical sensing control line 5 with drain electrode, the source electrode of optical sensing TFT is connected with the drain electrode of gauge tap (ReadoutTFT); Gauge tap can be formed by the thin film transistor (TFT) that size is smaller, 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 longitudinal coordinate of touch point can be oriented by optical sensor signal line 4.

The most basic principle of optical touch sensitive be when finger touch to display panel or be irradiated to a certain region of display panel with laser pen time, the optical sensing unit of display panel responds to different light intensity, shows different qualities, thus exports different electric signal.

Particularly, under normal surround lighting, can produce stable light leakage current in the optical sensing TFT in above-mentioned touch display panel, optical sensing TFT is also stable to the electric signal of gauge tap transmission.When finger touch is to display panel, the light that the optical sensing TFT in touch point institute overlay area receives dies down, and the light leakage current produced in optical sensing TFT diminishes, and the electric signal that correspondingly optical sensing TFT exports also dies down; When additional light source irradiation display panels such as laser pens, the light grow that the optical sensing TFT in irradiation area receives, the light leakage current produced in optical sensing TFT becomes large, the electric signal also grow of correspondingly optical sensing TFT output.

When gauge tap is opened, the electric signal of above-mentioned output is delivered to touch location decision circuitry by optical sensor signal line 4; Touch location decision circuitry receives the electric signal that optical sensing unit exports, process by situation about opening Strength Changes situation and the grid line 3 of the electric signal received the position judging touch point, the signal transacting the center afterwards position of touch point being fed back to touch display panel is triggered.

As shown in Figure 4, when pointing or laser pen touches display panel, the light intensity of the surround lighting received or additional light source that are placed in the opening part on optical sensing unit is changed owing to stopping, cause optical sensing TFT(PhotoTFT) light leakage current change, because the change of light leakage current thus cause the change in voltage of Cst2.When in overlay area, touch point, grid line 3 passes into grid start signal, gauge tap is also opened thereupon, and the signal of change arrives optical sensor signal line 4 by gauge tap (ReadoutTFT); Electrical signal transfer processes to touch location decision circuitry by optical sensor signal line 4, by touch location decision circuitry by processing the intensity of this electric signal, then judges the position of touch point according to the RST of grid line 3.

In the present invention, optical sensing unit can on array base palte arrangement in a row, also can on array base palte arrayed in columns, or on array base palte, become matrix to arrange.Particularly, array base palte is provided with a plurality of data lines, grid line 3 and data line 1 enclose formation sub-pixel, can interval 3 ~ 8 row sub-pixel between adjacent two optical sensing control lines 5.Further, can also interval 4 ~ 10 row sub-pixel between two adjacent optical sensor signal lines 4.Arrangement mode and the quantity of optical sensing unit and optical sensor signal line 4 specifically suitably can be changed according to actual conditions (such as to power consumption or the requirement touching 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 arranged separately, by can being optimized the signal that optical sensing unit outputs to optical sensor signal line 4 voltage of the applying on optical sensing control line 5, reduce the power consumption of touch display panel, and precision and the accuracy of optical touch can be ensured.

The embodiment of the present invention additionally provides a kind of display device, comprises touch display panel as above.This display device can be: 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 embodiment of the present invention additionally provides a kind of preparation method making above-mentioned touch display panel, comprises the following steps:

Step 1, on array base palte, form pixel TFT, optical sensing TFT(PhotoTFT by first time patterning processes) and the grid of gauge tap (ReadoutTFT), public electrode wire, grid line and optical sensing control line;

Wherein, the grid of gauge tap (ReadoutTFT) is connected with grid line, or also can directly be served as by grid line.

Step 2, on the array base palte through step 1, form gate insulation layer, active layer by second time patterning processes and be positioned at pixel TFT, the optical sensing TFT(PhotoTFT above gate insulation layer and active layer) and the source electrode of gauge tap (ReadoutTFT) and drain electrode, data line and optical sensor signal line;

Utilize same mask(mask plate) be manufactured with the scheme of active layer and source and drain metal layer pattern, belong to routine techniques for a person skilled in the art, repeat no more herein.

In step 2, the source electrode of optical sensing TFT is connected with the drain electrode of gauge tap, or the source electrode of optical sensing TFT and the drain electrode of gauge tap into a single integrated structure; Meanwhile, the source electrode of gauge tap is connected with optical sensor signal line.

Step 3, by third time patterning processes on the array base palte through step 2, form the figure including the insulation course of pixel electrode via hole, the position of this pixel electrode via hole is positioned at above the drain electrode of pixel TFT, need at optical sensing TFT(PhotoTFT simultaneously) grid (or grid lead wire) and drain electrode corresponding region via hole (viahole) is set, so that connect grid and the drain electrode of optical sensing TFT by subsequent technique;

Step 4, obtain the pixel electrode that formed by ITO and connecting electrode on the insulating layer by the 4th patterning processes, pixel electrode is connected with the drain electrode of pixel TFT by pixel electrode via hole, the connecting electrode formed by ITO material is produced with the drain and gate of optical sensing TFT respectively by the via hole above the drain and gate of optical sensing TFT and is electrically connected, and then is connected with optical sensing control line with drain electrode by the grid of optical sensing TFT.Described connecting electrode and pixel electrode arrange with layer but do not produce any electrical connection.

The preparation method of making touch display panel of the present invention, does not need to increase patterning processes, adopts four patterning processes can to complete the array base palte of touch display panel.

In the above-described embodiments, be all for TN type array base palte, introduce touch display panel in the present invention and preparation method thereof; For the in-cell touch display panel based on VA type, IPS type, ADS type array base palte; can be suitable for the scheme provided in the embodiment of the present invention equally, the touch display panel therefore 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 the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from principle of the present invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (11)

1. a touch display panel, comprises array base palte, and described array base palte is provided with many grid lines and many public electrode wires, it is characterized in that, described touch display panel also comprises:
Be arranged on the multiple optical sensing unit on described array base palte, described optical sensing unit comprises optical sensing TFT, controls the gauge tap of the output of the electric signal of described optical sensing TFT;
Be arranged on the pixel gauge tap for showing on described array base palte;
Be arranged on the optical sensing control line on 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 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, for exporting optical sensor signal;
By described optical sensing control line for described optical sensing TFT provides the voltage feed unit of burning voltage.
2. touch display panel according to claim 1, is characterized in that, the magnitude of voltage that described voltage feed unit provides for described optical sensing TFT 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 are arranged with layer.
5. touch display panel according to claim 1, is characterized in that, described array base palte is also provided with a plurality of data lines, and described grid line and described data line enclose formation sub-pixel, interval 3 ~ 8 row sub-pixel between adjacent two optical sensing control lines.
6. touch display panel according to claim 1, is characterized in that, described touch display panel also comprises touch location decision circuitry, is connected and judges touch location according to the signal received with described optical sensor signal line.
7. touch display panel according to claim 6, it is characterized in that, described optical sensing unit also comprises:
Gauge tap, for controlling the output of the electric signal of described optical sensing TFT.
8. touch display panel according to claim 7, is characterized in that, interval 4 ~ 10 row sub-pixel between two adjacent described 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. make a preparation method for touch display panel according to any one of claim 1-9, it is characterized in that, comprising:
On array base palte, the grid of pixel TFT, optical sensing TFT and gauge tap, public electrode wire, grid line and optical sensing control line is formed by first time patterning processes.
11. 1 kinds of display device, is characterized in that, comprise touch display panel as claimed in any one of claims 1-9 wherein.
CN201210279707.1A 2012-08-07 2012-08-07 Touch display panel and preparation method thereof, display device CN102830857B (en)

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