CN100347653C

Movatterモバイル変換

Info

Publication number: CN100347653C
Application number: CNB2004100745858A
Authority: CN
Inventors: 翁健森; 伊藤政隆
Original assignee: AU Optronics Corp
Current assignee: AUO Corp
Priority date: 2004-09-07
Filing date: 2004-09-07
Publication date: 2007-11-07
Anticipated expiration: 2024-09-07
Also published as: CN1588432A

Abstract

本发明是一种具有指纹辨识功能的透光触控板。所述透光触控板设于显示面板的表面，具有至少一指纹辨识区域，并且包括一薄膜晶体管阵列、多条信号线、一透光导电图案层、一分隔图案层与一导电弹性膜层。其中，薄膜晶体管阵列是形成于指纹显示区域处的显示面板表面。多条信号线是位于薄膜晶体管阵列中，并连接各个薄膜晶体管。透光导电图案层是形成于信号线的上方，并与薄膜晶体管相连接。分隔图案层是位于显示面板表面，并且环绕指纹辨识区域。导电弹性膜层是位于分隔图案层的上方，并与透光导电图案层相互分离。

The present invention is a light-transmitting touch panel with a fingerprint recognition function. The light-transmitting touch panel is arranged on the surface of a display panel, has at least one fingerprint recognition area, and includes a thin film transistor array, a plurality of signal lines, a light-transmitting conductive pattern layer, a separation pattern layer and a conductive elastic film layer. Among them, the thin film transistor array is formed on the surface of the display panel at the fingerprint display area. A plurality of signal lines are located in the thin film transistor array and connect each thin film transistor. The light-transmitting conductive pattern layer is formed above the signal line and is connected to the thin film transistor. The separation pattern layer is located on the surface of the display panel and surrounds the fingerprint recognition area. The conductive elastic film layer is located above the separation pattern layer and is separated from the light-transmitting conductive pattern layer.

Description

Transmitting touch control plate with finger print identification function

Technical field

The invention relates to a kind of transmitting touch control plate of being located at panel surface, especially a kind of transmitting touch control plate with finger print identification function.

Background technology

Along with science and technology progresses greatly day by day, the diversification that becomes of healing of the input media of electronic product.And in numerous input medias, Trackpad is that the function with input media and display integrates, except can save input media the space that must occupy, the characteristic that Trackpad allows the user directly to import on display panel also provides more humane selection.Therefore, in many electronic products, use Trackpad to replace keyboard gradually as main input media.

Please refer to shown in Figure 1ly, is the synoptic diagram of a typical resistances formula transmitting touch control plate (transparent touchpane1) 10.This transmitting touch control plate 10 is the surfaces that are made in display panel (not icon), and comprises a light transmission conductive layer (ITO Layer) 12, one transparency conducting film (ITO Film) 16 and a plurality of separations (spacer) 14.Wherein, light transmission conductive layer 12 is directly to be made in panel surface, and transparency conducting film 16 is the tops that are positioned at light transmission conductive layer 12, and, separation 14 is clampings in 16 of light transmission conductive layer 12 and transparency conducting films, and light transmission conductive layer 12 and transparency conducting film 16 are separated from each other.

The relative dual-side 12a and the 12b of light transmission conductive layer 12 are connected with different voltage level, and make the voltage gradient that produces on the light transmission conductive layer 12 perpendicular to Y direction among the figure.Simultaneously, the relative dual-side 16a and the 16b of this transparency conducting film 16 also are connected with different voltage level, and make the voltage gradient that produces on the transparency conducting film perpendicular to X-direction among the figure.When finger transparency conducting film 16 is exerted pressure, transparency conducting film 16 is contacted with light transmission conductive layer 12.To cause the voltage level distribution on light transmission conductive layer 12 and the transparency conducting film 16 to change.And see through the voltage level value of detecting 16 4 corner location of transparency conducting film, can infer that the pressure of finger is touched the position.It should be noted that this resistance-type transmitting touch control plate 10 only can detect the pressure of single fixed point and touch signal, touch signal and can't detect to press as fingerprint pattern multiple spots such as (finger print pattern).

Please refer to shown in Fig. 2 A and Fig. 2 B, is the vertical view and the sectional view of the transmittingtouch control plate 20 of a typical tool finger print identification function.And Fig. 2 B is corresponding to the a-a profile line among Fig. 2 A.This transmittingtouch control plate 20 is to be made on thedisplay panel 30, and, comprise a plurality of thin film transistor (TFT) 22, a plurality of data line 24, a plurality of sweep trace 26, a printing opacityconductive pattern layer 27, electrically conductiveelastic retes 28 and separation patternedlayer 29 that are array distribution.Wherein, a plurality of data lines 24 are vertically to be arranged on thedisplay panel 30, and a plurality of sweep trace 26 is transversely arranged ondisplay panel 30, to mark off a plurality of grids.Each thin film transistor (TFT) 22 is to lay respectively in these grids, and its drain D is to be connected to adjacent data line 24, and grid G is to be connected to adjacent scanning lines 26.

Printing opacityconductive pattern layer 27 includes a plurality ofblock 27a, riddles respectively in these grids.And eachblock 27a is the source S that connects the thin film transistor (TFT) 22 in the grid so far.Electrically conductiveelastic rete 28 is the tops that are positioned at printing opacity conductive pattern layer 27.Separating patternedlayer 29 is to be positioned on thedisplay panel 30, and be surrounded on transmittingtouch control plate 20 around, make with printing opacityconductive pattern layer 27 and be separated from each other to support electrically conductiveelastic rete 28.

When finger this transmittingtouch control plate 20 being exerted pressure, be subjected to pressing the partially conductive layers of elastomeric film of touching 28, iscorresponding block 27a in the contact printing opacity conductive pattern layer 27.And make the electric signal that feeds electrically conductiveelastic rete 28, and seen through theseblocks 27a, be passed to the source S of corresponding thin film transistor (TFT) 22.At the same time, sweep signal is to see through sweep trace 26, and the electric signal that feeds each thin film transistor (TFT) 22 by the row sampling, and by the position of the pairing thin film transistor (TFT) 22 of this electric signal of data line 24 interpretations, is touched the position to differentiate to press.

Under the situation of using traditional transmittingtouch control plate 20, the light that backlight produced must penetratedisplay panel 30, printing opacityconductive pattern layer 27 and electrically conductiveelastic rete 28 in regular turn, the picture of display panel could be sent to the external world.Even and the indium tin oxide (ITO) or the indium-zinc oxide (IZO) of employing high transmission rate are made printing opacityconductive pattern layer 27, light is in penetrating into extraneous process, also have part light by these printing opacityconductive pattern layer 27 absorptions, and influence the luminescence efficiency of display.In addition, if printing opacityconductive pattern layer 27 only covers the part surface ofdisplay panel 30, so that the function of fingerprint input to be provided, then be coated with printing opacityconductive pattern layer 27 places, the picture brightness ofdisplay panel 30 will be starkly lower than other part that is covered, and cause the uneven display effect that influences of picture brightness.

So, how to improve the transmittance of printing opacity conductive pattern layer, will very significant effects be arranged for the picture quality of display panel.

Summary of the invention

Fundamental purpose of the present invention is to improve the transmittance of the transmitting touch control plate of tool finger print identification function.

The present invention provides a kind of transmitting touch control plate with finger print identification function, is located at a panel surface.This transmitting touch control plate has at least one identification of fingerprint zone, comprises a thin film transistor (TFT) array, many signal line, a printing opacity conductive pattern layer, a separation patterned layer and an electrically conductive elastic rete.Wherein, thin film transistor (TFT) array is the panel surface that is formed at place, fingerprint viewing area.Many signal line are to be arranged in thin film transistor (TFT) array, and, be connected to each thin film transistor (TFT).The printing opacity conductive pattern layer is the top that is formed at signal wire, and is connected with thin film transistor (TFT).Separating patterned layer is to be positioned at panel surface, and around the identification of fingerprint zone.The electrically conductive elastic rete is to be positioned at the top of separating patterned layer, and is subjected to separating the patterned layer support, makes with the printing opacity conductive pattern layer to be separated from each other.When electrically conductive elastic rete pressurized contacts with the printing opacity conductive pattern layer, an electrical signals is to import thin film transistor (TFT) into, and sees through signal wire and outwards transmit, and presses the position for induction.

The present invention provides a kind of flat-panel screens in addition, at least have a display panel and a transmitting touch control plate, this transmitting touch control plate is the surface that is attached at this display panel, and, this transmitting touch control plate has at least one identification of fingerprint zone, it is characterized in that described transmitting touch control plate comprises: a thin film transistor (TFT) array is the panel surface that is formed at this place, fingerprint viewing area; Many signal line crisscross in this thin film transistor (TFT) array with checkerboard, and the grid of each thin film transistor (TFT) is connected with this signal wire respectively with drain electrode; One printing opacity conductive pattern layer is the top that is formed at this signal wire, and is connected with the source electrode of this thin film transistor (TFT); One separates patterned layer, is positioned at this panel surface, and around this identification of fingerprint zone; One electrically conductive elastic rete is positioned at the top of this separation patterned layer, and is subjected to this separation patterned layer and supports to make with this printing opacity conductive pattern layer and be separated from each other; When this electrically conductive elastic rete pressurized contacts with this printing opacity conductive pattern layer, an electrical signals is the electrode that imports this thin film transistor (TFT) into, and sees through this signal wire and outwards transmit, and presses the position for induction.

The present invention also provides a kind of fingerprint identification system, is arranged at the surface of a display panel, it is characterized in that described fingerprint identification system comprises: a thin film transistor (TFT) array is to be formed at this panel surface; Many signal line crisscross in this thin film transistor (TFT) array with checkerboard, and the grid of each thin film transistor (TFT) is connected with this signal wire respectively with drain electrode; One printing opacity conductive pattern layer is the top that is formed at this signal wire, and is connected with the source electrode of this thin film transistor (TFT); One separates patterned layer, is positioned at this panel surface; One electrically conductive elastic rete is positioned at the top of this separation patterned layer, and is subjected to this separation patterned layer and supports to make with this printing opacity conductive pattern layer and be separated from each other; One detecting unit electrically connects this electrically conductive elastic rete and this signal wire respectively, with the detecting fingerprint pattern; When this electrically conductive elastic rete pressurized contacts with this printing opacity conductive pattern layer, an electrical signals is the electrode that imports this thin film transistor (TFT) into, and sees through this signal wire and be passed to this detecting unit, presses the position for induction.

Description of drawings

Fig. 1 is the synoptic diagram of a typical resistances formula transmitting touch control plate;

Fig. 2 A and Fig. 2 B are the sectional view and the vertical views of the transmitting touch control plate of a typical tool finger print identification function;

Fig. 3 is the synoptic diagram of the present invention's one flat-panel screens preferred embodiment;

Fig. 4 A and Fig. 4 B are the sectional view and the vertical views of identification of fingerprint zone one preferred embodiment of Fig. 3;

Fig. 5 is the block of printing opacity conductive pattern layer, the amplification plan view of another embodiment;

Fig. 6 is the block of printing opacity conductive pattern layer, the amplification plan view of another embodiment.

Symbol description:

Transmitting touch control plate～10,20,40 light transmission conductive layer～12

Transparency conducting film 16 separations～14

Thin film transistor (TFT)～22,42 data lines～24,44

Sweep trace～26,46 printing opacity conductive pattern layer～27,47,57,67

Block～27a, 47a, 57a, 67a electrically conductive elastic rete～28,48

Separate patterned layer～29,49 display panels～30,50

Elastic insulated substrate～482 conductive coatings～484

First extension～472 second extension～474

The 3rd extension～572 the 4th extension～574

The 5th extension～576

Embodiment

Can be about the advantages and spirit of the present invention by following detailed Description Of The Invention and appended graphic being further understood.

Please refer to shown in Figure 3ly, is the synoptic diagram of the present invention's one flat-panel screens preferred embodiment.As shown in FIG., this flat-panel screens has adisplay panel 50 and a transmitting touch control plate (transparent touch panel) 40.Wherein, transmittingtouch control plate 40 is the surfaces that are attached atdisplay panel 50, and, have identification of fingerprint zone F in the lower left corner of transmittingtouch control plate 40.

Please refer to Fig. 4 A with shown in the figure B, is the vertical view and the sectional view of identification of fingerprint zone F one preferred embodiment of Fig. 3.And Fig. 4 B is corresponding to the b-b profile line among Fig. 4 A.This transmittingtouch control plate 40 comprises a plurality of thin film transistor (TFT)s 42, a plurality of

signal wire

44 and 46, a printing opacityconductive pattern layer 47, a separation patternedlayer 49 and an electrically conductiveelastic rete 48 at F place, identification of fingerprint zone.Wherein, a plurality of thin film transistor (TFT)s 42 are with the upper surface of array distribution in the display panel at F place, identification of fingerprint zone, to form a thin film transistor (TFT) array.Above-mentioned signal wire is to comprise a plurality ofdata lines 44 of upper surface that are parallel to each other and vertically are arranged in thedisplay panel 50 at F place, identification of fingerprint zone, is parallel to each other and thesweep trace 46 of the upper surface of transversely arrangeddisplay panel 50 in the regional F of identification of fingerprint place with a plurality of.Thesedata lines 44 are to present checkerboard to crisscross in the above-mentioned thin film transistor (TFT) array with sweep trace 46.And the drain D of each thin film transistor (TFT) 42 is to be connected toadjacent data line 44, and grid G is to be connected toadjacent scanning lines 46.

Printing opacityconductive pattern layer 47 generally is made of indium tin oxide (ITO), isdisplay panel 50 tops that are covered in F place, fingerprint viewing area.And this printing opacityconductive pattern layer 47 is to divide into a plurality of blocks that are separated from each other (islet) 47a, corresponds to each thin film transistor (TFT) 42 respectively, and is connected to the source S of pairing thin film transistor (TFT) 42.Shown in Fig. 4 A, eachblock 47a of printing opacityconductive pattern layer 47 has onefirst extension 472 and onesecond extension 474 respectively, and presents the outward appearance of L type.Andfirst extension 472 andsecond extension 474 are by the crossover location ofdata line 44 withsweep trace 46, respectively along the move towards extension ofdata line 44 with sweep trace 46.In addition, be subjected to covering of eachblock 47a for fear of the light that passesdisplay panel 50, the width of aforementionedfirst extension 472 andsecond extension 474 is to be subjected to limiting in the width ofdata line 44 with sweep trace 46.With regard to a preferred embodiment, the live width offirst extension 472 is 1 to 1.5 times ofdata line 44 live widths, and the live width ofsecond extension 474 is 1 to 1.5 times ofsweep trace 46 live widths.

Electrically conductiveelastic rete 48 is to be positioned on the printing opacityconductive pattern layer 47, and comprises an elastic insulatedsubstrate 482 and a conductive coating 484.Wherein,conductive coating 484 is the lower surfaces that are positioned at elastic insulated substrate 482.Basically, thisconductive coating 484 can be an indium oxide layer of tin or a metal level.Separating patternedlayer 49 is to be positioned on thedisplay panel 50, and be surrounded on transmittingtouch control plate 40 around, to support electrically conductiveelastic rete 48, make with printing opacityconductive pattern layer 47 to be separated from each other.

In order to detect fingerprint signal, a detecting unit (not icon) is to be electrically connected electrically conductiveelastic rete 48 and each data line 44.When finger electrically conductiveelastic rete 48 being exerted pressure, be subjected to pressing the partially conductive layers of elastomeric film of touching 48, iscorresponding block 47a in the contact printing opacity conductive pattern layer 47.Whereby, feed the electric signal of electrically conductiveelastic rete 48, be passed to the source S of the thin film transistor (TFT) 42 of corresponding aforementioned block 47a.Simultaneously, sweep signal bysweep trace 46 inputs is to open thin film transistor (TFT) 42 by row, make this electric signal be seen throughdata line 44 and outwards be passed to detecting unit,, and then differentiate to press and touch the position for the position of the pairing thin film transistor (TFT) 42 of detecting unit interpretation electric signal.

Though it should be noted that the thin film transistor (TFT) described in Fig. 4 A and Fig. 4 B, be the thin film transistor (TFT) that belongs to bottom-gate (bottom gate), yet, be not limited to this.Thin film transistor (TFT) used in the present invention is the usefulness as switch, to present the function of identification of fingerprint.Thereby being not limited to use bottom gate thin film transistor, top grid (top gate) thin film transistor (TFT) also can be applicable among the present invention.

Please refer to Fig. 5, is the amplification plan view of another embodiment ofblock 57a of printing opacity conductive pattern layer.As shown in FIG., thisblock 57a has one the3rd extension 572, one the4th extension 574 and one the5th extension 576, and presents the outward appearance of T type.Wherein, the3rd extension 572 and the4th extension 574 are by the crossover location ofdata line 44 withsweep trace 46, along the trend ofdata line 44, extend toward the both sides ofsweep trace 46 respectively.And the5th extension 576 is by the crossover location ofdata line 44 withsweep trace 46, along the extension of moving towards of sweep trace 46.The3rd extension 572 and the4th extension 574 that it should be noted that adjacent twoblock 57a must keep a preset distance, touch the identification capability of signal for pressure to guarantee printing opacity conductive pattern layer 57.

Please refer to Fig. 6, is the amplification plan view of the another embodiment ofblock 67a of printing opacity conductive pattern layer.As shown in FIG., thisblock 67a is bydata line 44 crossover location withsweep trace 46, alongsweep trace 46 move towards extend, and present the outward appearance of I type.Width that it should be noted that this Itype block 67a is greater thansecond extension 474 among the 4th figure, so that enough contacts area to be provided, prevents that detection signal is too faint.And with regard to a preferred embodiment, the live width of this I shapeblock 67a can increase to the octuple of the live width ofsweep trace 46, and is unlikely to the transmittance in identification of fingerprint zone is caused too much influence.

Basically, the width of fingerprint is between 400 microns and 500 microns, therefore, in order to provide enough resolution with the detecting fingerprint, with regard to a preferred embodiment, in the transmitting touch control plate of the present invention, the distance of adjacent twodata lines 44 must be less than 100 microns, and the distance of adjacent twosweep traces 46 also must be less than 100 microns.

Basically, the light that backlight produced covers data line, sweep trace, the thin film transistor (TFT) array that is subjected to displaypanel 50 in the process that passes display panel 50.And the light that passesdisplay panel 50 is when passing transmittingtouch control plate 40 of the present invention, anddata line 44, thesweep trace 46 that will be subjected to again in the transmittingtouch control plate 40 cover with thin film transistor (TFT) 42.Therefore, with regard to a preferred embodiment,data line 44 in the transmittingtouch control plate 40, sweeptrace 46 and thin film transistor (TFT) 42, be data line, sweep trace and the thin film transistor (TFT) array of being located atdisplay panel 50 respectively directly over, with the luminescence efficiency of raising backlight.

Though it should be noted that in Fig. 3 to have only the lower right-hand corner of transmittingtouch control plate 40 to provide finger print identification function.But if the electrically conductive elastic rete in the transmittingtouch control plate 40 48 extends the whole display surfaces thatcover display panel 50, and printing opacityconductive pattern layer 47 is also extended the whole display surfaces that cover display panel 48.The other parts of transmittingtouch control plate 40 then, the function of the single-point input that also provides general Trackpad and had.

Compared to the transmitting touch control plate of traditional tool finger print identification function, the present invention has following advantage:

One, shown in Fig. 4 A and 4B, in the printing opacityconductive pattern layer 47 of the present invention, eachblock 47a comprises onefirst extension 472 and onesecond extension 474, lays respectively at directly overdata line 44 and the sweep trace 46.And because the light that backlight produced when passing transmittingtouch control plate 40, will inevitably be covered bydata line 44 andsweep trace 46, therefore, printing opacityconductive pattern layer 47 of the present invention obviously can improve the aperture opening ratio of transmittingtouch control plate 40, to promote luminosity.

Two, because the present invention sees through having or not ofdata line 44 detecting electric signal, touch the position to differentiate to press.And, can produce electric signal as long as electrically conductiveelastic rete 48 contacts withblock 47a, as for the size of contact area, non-its asked.Therefore, transmittingtouch control plate 40 of the present invention can't impact the generation of touching signals.Otherwise, owing to the size that appropriateness of the present invention has been dwindledblock 47a, can improve the distance ofadjacent block 47a, to improve the identification capability of fingerprint.