CN102541334A - Touch display device and method of manufacturing the same - Google Patents
Touch display device and method of manufacturing the same Download PDFInfo
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Abstract
A touch display device and a method of manufacturing the same, the touch display device comprising: the touch screen comprises a touch structure layer, a touch screen substrate and a pixel array substrate, wherein the touch screen substrate comprises an output lead (comprising a driving electrode lead and an induction electrode lead) of the touch structure layer, and the pixel array substrate is provided with a pixel array and a peripheral lead of the pixel array; the output lead of the touch control structure layer is overlapped with the peripheral lead of the pixel array in the light transmission direction; the touch display device further comprises a first shielding layer disposed between the drive electrode leads and peripheral leads of the pixel array; and the second shielding layer is arranged between the sensing electrode lead and the peripheral lead of the pixel array. The shielding layer reduces the parasitic capacitance between the peripheral lead of the pixel array substrate and the output lead of the touch screen substrate, avoids the coupling between the driving electrode and the sensing electrode of the touch screen through the parasitic capacitance, and further improves the signal-to-noise ratio.
Description
Technical field
The present invention relates to touch the demonstration field, relate in particular to a kind of embedded touch display unit and manufacturing approach thereof.
Background technology
Touch display unit is the simplest, convenient, natural at present a kind of man-machine interaction mode as a kind of input media.Therefore, touch display unit is applied in the various electronic products more and more, for example mobile phone, notebook computer, MP3/MP4 etc.
Be equipped with touch-screen in the touch display unit, with the function that realize to touch shows, and based on the medium of different working principle and transmission information, touch-screen can be divided into four types of resistance-types, condenser type, infrared-type, surface acoustic wave.And capacitive touch screen is because to have a life-span long, and the transmittance height can support advantage such as multiple point touching to become the touch screen technology of present main flow.In order to make touch display unit more frivolous, prior art has developed embedded touch and has shown (In-cell touch panel) technology, and promptly touch-screen is integrated in the LCD.Show the schematic top plan view of the embedded touch display unit of prior art one embodiment with reference to figure 1.Said touch display unit comprises: touch screen base plate, the image element array substrates (not shown) that is oppositely arranged with touch screen base plate.
As can beappreciated from fig. 1, the display plane of the embedded touch display unit of prior art comprises and is used for that image shows and the touch viewing area 121 of touch sensible, is placed with the peripheral leads district 111 of a plurality of leads.Be provided with the peripheral leads (not shown) of the public electrode lead-in wire, sweep trace lead-in wire etc. of pel array and pel array in the said image element array substrates, correspond respectively to and touch viewing area 121 and peripheral leads district 111.Be provided with the output lead (comprising drive electrode lead-in wire and induction electrode lead-in wire) (not shown) of the touch-control structure layer that comprises drive electrode and induction electrode and touch-control structure layer in the said touch screen base plate, correspond respectively to and touch viewing area 121 and peripheral leads district 111.That is to say that said pel array and said touch-control structure layer are oppositely arranged in said touch viewing area 121; The output lead of the peripheral leads of said pel array and said touch-control structure layer is oppositely arranged in said peripheral leads district 111, and the peripheral leads of the output lead of touch-control structure layer and said pel array overlaps on the printing opacity direction.
The peripheral leads of said pel array and pel array is arranged at first transparency carrier (not drawing among the figure); The touch-control structure layer of said drive electrode and induction electrode, the output lead of touch-control structure layer are arranged on second transparency carrier and (do not draw among the figure).
The four edges AB of said touch display unit, BC, CD, DA be four part 111a, 111b, 111c, the 111d in corresponding peripheral leads district 111 respectively; All kinds of lead-in wires of image element array substrates are connected to display driver chip (not shown) from the BC limit of 111b, and other parts 111a in peripheral leads district 111,111c, 111d are distributed with the public electrode lead-in wire, and 111a, 111c also are distributed with the sweep trace lead-in wire.The drive electrode lead-in wire and the induction electrode lead-in wire of the touch-control structure layer of general touch screen base plate can not be exported from same direction with all kinds of lead-in wires of image element array substrates; So the output lead of touch screen base plate can not be corresponding to the 111b of peripheral lead district 111 part, can only corresponding other parts 111a, 111c, 111d in peripheral lead district 111.That is to say that the drive electrode lead-in wire of touch screen base plate and induction electrode lead-in wire overlap at other parts 111a, 111c, the 111d place of peripheral lead district 111 with the peripheral leads of image element array substrates.
Fig. 1 of present embodiment only shows the situation that the peripheral leads of output lead and the image element array substrates of touch screen base plate overlaps at the 111c place of peripheral lead district 111.
With touch display unit is that LCD (Liquid Crystal Display) touch display is that example is further set forth.Show the diagrammatic cross-section of touch viewing area 121 of an embodiment of LCD (the Liquid Crystal Display) touch display of prior art with reference to figure 2.Touching viewing area 121, the LCD of this embodiment (Liquid Crystal Display) touch display comprises: image element array substrates 003, and the touch screen base plate 001 that is oppositely arranged of image element array substrates 003, be arranged at the liquid crystal layer 002 between image element array substrates 003 and the touch screen base plate 001; Wherein touch screen base plate 001 relative liquid crystal layer 002 approach from a distance comprises successively: first transparency carrier 101, touch-control structure layer 102, insulation course 103, common electrode layer (ITO) 104; Liquid crystal layer 002 comprises a plurality of liquid crystal molecules 105; Image element array substrates 003 relative liquid crystal layer 002 is from comprising closely and far successively: pel array 106, second transparency carrier 107.In the time will realizing colored the demonstration, (Color Filter CF) serves as insulation course 103, also can between first transparency carrier 101 and touch-control structure layer 102, increase by a colored filter can to use colored filter.Said LCD touch display unit also comprises polaroid, backing structure etc., for concise and to the point, clear, does not illustrate in the drawings.In the present embodiment, said touch-control structure layer 102 is embedded in the touch screen base plate 001, makes touch display unit more frivolous.With reference to figure 3, show the synoptic diagram of touch-control structure layer 102 1 embodiment shown in Figure 2, in the present embodiment, said touch-control structure layer 102 is an example with the single-layer electrodes touch-control structure.Particularly, said touch-control structure layer 102 comprises Drive Layer and inductive layer, and Drive Layer comprises a plurality of drive electrodes 71, and is regularly arranged into multirow drive electrode 71a, 71b, 71c, 71d; Inductive layer comprises a plurality of induction electrodes 72, and the drive electrode 71 of induction electrode 72 and every row is spaced each drive electrode 71 and adjacent induction electrode 72 formation mutual capacitance.Wherein, Drive Layer and inductive layer are positioned at same one deck, and drive electrode 71 links to each other with drive circuit unit (figure does not show) through drive wire 81, and induction electrode 72 links to each other with testing circuit unit (figure does not show) through the line of induction 82.When finger touches touch-screen; Electric current flows into finger; Equivalence is the change of the mutual capacitance between drive electrode 71 and the induction electrode 72, measures said mutual capacitance from the testing circuit unit and changes the weak current variation that causes, and then obtain the position that finger touches touch-screen.
With reference to figure 4; Show the synoptic diagram of pel array 106 1 embodiment shown in Figure 2; Said pel array 106 comprises the data line 92 that multi-strip scanning line 91 that horizontal direction arranges, many are arranged perpendicular to sweep trace 91, and said multi-strip scanning line 91 surrounds a plurality of pixel cells with many data lines 92, comprises thin film transistor (TFT) TFT 94 in the pixel cell; Said sweep trace 91 is connected in the grid of TFT 94; Be used for to pixel cell drive signal being provided, said data line 92 is connected in the source/drain of TFT 94, is used for being provided for to pixel cell the pixel voltage of display image.Need to prove and only illustrated sweep trace 91 and data line 92 among Fig. 4; In other embodiment of pel array; The pixel cell of said pel array has the pixel public electrode of the MM CAP of being used to form; Common electrode layer 104 in said pixel public electrode and the touch screen base plate links to each other through the public electrode lead-in wire in peripheral leads district 111, and holds with being connected in.
With reference to figure 5, show the synoptic diagram of peripheral leads shown in Figure 1 district one embodiment.Need to prove; For the drive wire in the touch-screen 81 and the line of induction 82 are connected to circuit unit; In peripheral lead district 111c, be placed with drive electrode lead-in wire 1021 and induction electrode lead-in wire 1022, said drive electrode lead-in wire 1021 is used to connect the testing circuit unit (not shown) that drive wire 81 is used to be connected the line of induction 82 with the drive circuit unit that is positioned at touch display unit CD limit (not shown), induction electrode lead-in wire 1022 and is positioned at touch display unit CD limit; For pel array 106 is connected to circuit unit, be placed with sweep trace lead-in wire 1061 and public electrode lead-in wire 1062 among the peripheral leads district 111c, be used for sweep trace 91 and public electrode (not shown) are connected to display driver chip (not shown) from the BC limit.At peripheral lead district 111c; Drive electrode lead-in wire 1021 is arranged for row with induction electrode lead-in wire 1022; And sweep trace lead-in wire 1061 is arranged for row with public electrode lead-in wire 1062, therefore all overlaps with sweep trace lead-in wire 1061 and public electrode lead-in wire 1062 at the lead-in wire of drive electrode described in the peripheral lead district 111 1021, induction electrode lead-in wire 1022.The drive electrode lead-in wire 1021 that present embodiment only shows touch screen base plate partly overlaps with public electrode lead-in wire 1062 111c in peripheral lead district 111 with the sweep trace lead-in wire 1061 of induction electrode lead-in wire 1022 with image element array substrates.In fact, the drive electrode of touch screen base plate lead-in wire 1021 can also partly overlap at the 111a of peripheral lead district 111 with public electrode lead-in wire 1062 with the sweep trace lead-in wire 1061 of induction electrode lead-in wire 1022 with image element array substrates; Perhaps the drive electrode of touch screen base plate lead-in wire 1021 partly overlaps with public electrode lead-in wire 1062 111d in peripheral lead district 111 of induction electrode lead-in wire 1022 with image element array substrates.Therefore, the drive electrode of touch screen base plate lead-in wire 1021 can overlap with a sweep trace lead-in wire or public electrode lead-in wire with induction electrode lead-in wire 1022 simultaneously.The go between diagrammatic cross-section at 1061 overlapping places of drive electrode lead-in wire 1021 and sweep trace among the peripheral leads district 111c shown in Figure 5.Need to prove that peripheral leads district 111 is not provided with liquid crystal layer, transparency conducting layer and colored filter.In said peripheral leads district; Touch display unit comprises first transparency carrier 101 and second transparency carrier 107 that is oppositely arranged, the sweep trace lead-in wire 1061 of the said drive electrode lead-in wire 1021 that sets gradually to second transparency carrier 107 from first transparency carrier 101, insulation course 108, said pel array.Wherein insulation course 108 can be the passivation layer (for example being silicon nitride) that is arranged on the image element array substrates 003, and/or is arranged at the envelope frame glue between image element array substrates 003 and the touch screen base plate 001.Because the thickness less (particularly when insulation course 108 is passivation layer) of insulation course 108, therefore, sweep trace lead-in wire 1061 forms bigger stray capacitance with the overlapping place of drive electrode lead-in wire 1021.Same, the overlapping place of overlapping place, sweep trace lead-in wire 1061 and the induction electrode lead-in wire 1022 of public electrode lead-in wire 1062 and drive electrode lead-in wire 1021 and the overlapping place of public electrode lead-in wire 1062 and induction electrode lead-in wire 1022 all can form bigger stray capacitance.Hence one can see that; In said peripheral leads district; Said touch display unit comprises first transparency carrier 101 and second transparency carrier 107 that is oppositely arranged, the peripheral leads (comprising sweep trace lead-in wire 1061 and public electrode lead-in wire 1062) of the output lead (comprising drive electrode lead-in wire 1021 and induction electrode lead-in wire 1022) of the touch screen base plate that sets gradually to second transparency carrier 107 from first transparency carrier 101, insulation course 108, said pel array.
Said stray capacitance reduces the signal to noise ratio (S/N ratio) that touches detection signal than conference.In order to be illustrated more clearly in stray capacitance to touching the influence of detection signal, further specify below in conjunction with the schematic equivalent circuit of touch-screen.
Show the touch-control schematic equivalent circuit of the touch display unit of prior art with reference to figure 6.Said equivalent electrical circuit comprises: the mutual capacitance 12 between signal source 3, drive electrode resistance 1, drive electrode and the induction electrode, induction electrode resistance 2; Testing circuit 6; Comprise in addition; The drive electrode lead-in wire of touch screen base plate and the formed stray capacitance 13a of overlapping that sweep trace goes between or public electrode goes between of image element array substrates; Touch screen base plate induction electrode lead-in wire links to each other through sweep trace lead-in wire or public electrode lead-in wire with 13b with the sweep trace lead-in wire of image element array substrates or the formed stray capacitance 13b of overlapping of public electrode lead-in wire, stray capacitance 13a; The inductance 17 of the resistance 16 of sweep trace lead-in wire or public electrode lead-in wire, sweep trace lead-in wire or public electrode lead-in wire.Wherein, signal source 3 is used on drive electrode, applying drive signal; Testing circuit 6 then is used for detecting touch detection signal 14.
When stray capacitance 13a and 13b are big; For the AC signal that signal source 1 is sent, its capacitive reactance is less, therefore; Be coupled through this stray capacitance 13a and 13b between the drive electrode of touch-screen and the induction electrode; AC signal forms current path 18 successively through capacitive reactance less driving stray capacitance 13a and 13b, and AC signal is through forming bigger basal signal at testing circuit 6 places behind the said current path 18.Because it is less usually that mutual capacitance changes corresponding signal, is submerged in easily in the bigger basal signal, make testing circuit 6 be difficult to detect mutual capacitance and change corresponding signal, cause and detect failure.
The touch display unit of prior art comprises image element array substrates (for example LCD image element array substrates, OLED image element array substrates) and the touch screen base plate that is oppositely arranged from the above; Wherein the output lead of touch screen base plate (comprising drive electrode lead-in wire and induction electrode lead-in wire) produces bigger stray capacitance with the peripheral leads (comprising sweep trace lead-in wire and public electrode lead-in wire) of image element array substrates at peripheral lead district overlapping place; Produce undesired signal through this stray capacitance 13a and 13b coupling between the drive electrode of touch-screen and the induction electrode; Make testing circuit be difficult to detect mutual capacitance and change corresponding signal, even cause and detect failure.
Summary of the invention
The problem that the present invention solves be the peripheral leads of drive electrode lead-in wire and induction electrode lead-in wire and image element array substrates of touch screen base plate in the touch display unit of prior art at peripheral lead district overlapping place the bigger stray capacitance of generation; Produce undesired signal through this stray capacitance coupling between the drive electrode of touch-screen and the induction electrode; Make testing circuit be difficult to detect mutual capacitance and change corresponding signal, even cause and detect failure; Higher touch display unit of a kind of signal to noise ratio (S/N ratio) and manufacturing approach thereof are provided.
For addressing the above problem, the present invention provides a kind of touch display unit, comprising: touch screen base plate, the image element array substrates that is oppositely arranged with touch screen base plate; Be provided with the peripheral leads of pel array and pel array in the said image element array substrates, be provided with the output lead of touch-control structure layer and touch-control structure layer in the said touch screen base plate; Said touch-control structure layer comprises drive electrode and induction electrode, and the output lead of said touch-control structure layer comprises drive electrode lead-in wire and induction electrode lead-in wire; The output lead of touch-control structure layer and the peripheral leads of said pel array overlap on the printing opacity direction; Said touch display unit also comprises first screen layer between the peripheral leads that is arranged at said drive electrode lead-in wire and said pel array; Be arranged at the secondary shielding layer between the peripheral leads of said induction electrode lead-in wire and said pel array.
Said first screen layer, said secondary shielding layer are held respectively with being electrically connected on.Said peripheral leads comprises public electrode lead-in wire and sweep trace lead-in wire.The display plane of said touch display unit comprises the touch viewing area that is used for image demonstration and touch sensible, the peripheral leads district that is placed with a plurality of leads; Said pel array and said touch-control structure layer are oppositely arranged in said touch viewing area; The output lead of the peripheral leads of said pel array and said touch-control structure layer is oppositely arranged in said peripheral leads district.Said touch screen base plate also comprises first transparency carrier, and the output lead of said touch-control structure layer and touch-control structure layer is arranged on said first transparency carrier; Said image element array substrates also comprises second transparency carrier, and the peripheral leads of said pel array and pel array is arranged on said second transparency carrier.In said peripheral leads district; Said touch display unit comprises first transparency carrier and second transparency carrier that is oppositely arranged, the peripheral leads of the output lead of the said touch-control structure layer that sets gradually to second transparency carrier from first transparency carrier, screen layer, insulation course, said pel array.Said insulation course can comprise passivation layer and/or envelope frame glue.
Optional, in said touch viewing area, said touch display unit also comprises the liquid crystal layer that is arranged between said image element array substrates and the said touch screen base plate; The said relatively liquid crystal layer of said touch screen base plate approach from a distance comprises successively: first transparency carrier, touch-control structure layer, insulation course, common electrode layer; The said relatively liquid crystal layer of said image element array substrates is from comprising closely and far successively: pel array, second transparency carrier.Said insulation course can be colored filter.Said first screen layer and secondary shielding layer can be arranged in the said touch screen base plate, are positioned at same one deck with said common electrode layer.The material of said first screen layer and secondary shielding and said common electrode layer all can be tin indium oxide or metal material.
Optional, said touch-control structure layer is the single-layer electrodes touch-control structure, said drive electrode and induction electrode are a plurality of and are spaced.Said common electrode layer comprises a plurality of spaced first public electrodes and second public electrode; First public electrode and drive electrode are over against setting on the printing opacity direction, and second public electrode and induction electrode are over against setting; All first public electrodes are also held with receiving, and all second public electrodes are also held with receiving.Said first screen layer is electrically connected with said first common electrode layer, and said secondary shielding layer is electrically connected with said second common electrode layer.Said first screen layer and said first common electrode layer are an integral body, realize the electrical connection of the two; Said secondary shielding layer and said second common electrode layer are an integral body, realize the electrical connection of the two.
Optional, said touch-screen is two-layer electrode touch-control structure.
Optional, said common electrode layer is an integral body, one of them of said first screen layer, secondary shielding layer is connected in common electrode layer.
In the above technical scheme, said first screen layer and secondary shielding can also be arranged in the image element array substrates.Said touch display unit can be liquid crystal indicator or organic electroluminescent LED display device.
Correspondingly, the present invention also provides a kind of manufacturing approach of touch display unit, comprising: first transparency carrier is provided; On said first transparency carrier, form the output lead of touch-control structure layer and touch-control structure layer; Said touch-control structure layer is the single-layer electrodes touch-control structure; Comprise spaced drive electrode and induction electrode, the output lead of touch-control structure layer comprises drive electrode lead-in wire and induction electrode lead-in wire; On said touch-screen, attach colored filter; Deposition forms common electrode layer on said colored filter; Form spaced first public electrode and second public electrode in the touch display unit viewing area; Said first public electrode and said drive electrode are over against setting, and said second public electrode and said induction electrode are over against setting; In the process that forms first public electrode and second public electrode, form first screen layer that covers said drive electrode lead-in wire and link to each other and the secondary shielding layer that covers said induction electrode lead-in wire and link to each other with said second public electrode with said first public electrode; Second transparency carrier is provided and forms pel array above that;
Between first transparency carrier and second transparency carrier, form liquid crystal layer.
Compared with prior art, the present invention has the following advantages:
1. the stray capacitance between the peripheral leads (comprising public electrode lead-in wire and sweep trace lead-in wire) that said screen layer has reduced image element array substrates and the output lead (drive electrode goes between and induction electrode goes between) of touch screen base plate; Avoided between drive electrode and the induction electrode of touch-screen through this stray capacitance coupling, and then improved signal to noise ratio (S/N ratio);
2. screen layer and transparency conducting layer can form simultaneously, avoid increasing technology, process simple.
Description of drawings
Fig. 1 is the schematic top plan view of prior art mutual capacitance type touch-screen one embodiment;
Fig. 2 is the diagrammatic cross-section of touch viewing area of an embodiment of the LCD touch display of prior art;
Fig. 3 is the synoptic diagram of touch-control structure layer one embodiment shown in Figure 2;
Fig. 4 is the synoptic diagram of pel array one embodiment shown in Figure 2;
Fig. 5 is the synoptic diagram of peripheral leads shown in Figure 1 district one embodiment;
Fig. 6 is the touch-control schematic equivalent circuit of the touch display unit of prior art;
Fig. 7 is the touch-control schematic equivalent circuit of this present invention touch display unit;
Fig. 8 is the synoptic diagram of touch display unit one embodiment of the present invention;
Fig. 9 is the schematic top plan view of touch screen base plate one embodiment shown in Figure 8;
Figure 10 is the schematic top plan view of another embodiment of touch screen base plate of the present invention.
Embodiment
For make above-mentioned purpose of the present invention, feature and advantage can be more obviously understandable, does detailed explanation below in conjunction with the accompanying drawing specific embodiments of the invention.
Set forth a lot of details in the following description so that make much of the present invention, implement but the present invention can also adopt other to be different from alternate manner described here, so the present invention has not received the restriction of following disclosed specific embodiment.
In order to solve the described problem of background technology, the inventor provides a kind of touch display unit, and said touch display unit comprises image element array substrates that is oppositely arranged and the touch screen base plate that comprises the touch-control structure layer; Its display plane comprises that being used to carry out image shows with the touch viewing area of touch sensible, is placed with a plurality of leads peripheral leads district of (comprising that sweep trace lead-in wire and public electrode go between); In said peripheral leads district; Said touch display unit comprises: first transparency carrier of the touch screen base plate that is oppositely arranged and second transparency carrier of image element array substrates, the peripheral leads of output lead, screen layer, insulation course and the pel array of the touch-control structure that sets gradually from first transparency carrier to second transparency carrier; Wherein, The output lead of touch-control structure comprises drive electrode lead-in wire and induction electrode lead-in wire; Said screen layer comprises first screen layer and secondary shielding layer; Said first screen layer is arranged between the peripheral leads of drive electrode lead-in wire and pel array, and said secondary shielding layer is arranged between the peripheral leads of induction electrode lead-in wire and pel array, and said first screen layer and secondary shielding layer are held respectively with being electrically connected on.
Below in conjunction with the touch-control schematic equivalent circuit of touch display unit of the present invention shown in Figure 7, the principle that touch display unit of the present invention can improve signal to noise ratio (S/N ratio) is described.
As shown in Figure 7; Said equivalent electrical circuit comprises: signal source 3, drive electrode resistance 1, induction electrode resistance 2, testing circuit 6; Mutual capacitance 12 between drive electrode and the induction electrode; Said equivalent electrical circuit also comprises first stray capacitance 51, the first screen layer resistance 52 and the first screen layer inductance 53 that produces between the drive electrode lead-in wire and first screen layer, second stray capacitance 54, secondary shielding layer resistance 55 and the secondary shielding layer inductance 56 that produce between induction electrode lead-in wire and the secondary shielding layer; Because said first screen layer and secondary shielding layer are held respectively with being electrically connected on; Therefore in equivalent electrical circuit; End 57 after said first stray capacitance 51, the first screen layer resistance 52 and 53 series connection of the first screen layer inductance holds 57 after said second stray capacitance 54, secondary shielding layer resistance 55 and 56 series connection of secondary shielding layer inductance with being connected in with being connected in.
After the AC signal process drive electrode resistance 1 that signal source 3 is sent; The part AC signal arrives testing circuit 6 through mutual capacitance 12, induction electrode resistance 2; The part AC signal is led ground end 57 through first stray capacitance 51, the first screen layer resistance 52 and the first screen layer inductance 53 successively; Perhaps lead ground end 57 through second stray capacitance 54, secondary shielding layer resistance 55 and secondary shielding layer inductance 56 successively; AC signal is difficult to successively to detect through first stray capacitance 51, the first screen layer resistance 52, the first screen layer inductance 53, second stray capacitance 54, secondary shielding layer resistance 55 and secondary shielding layer inductance 56 detected circuit 6; Thereby can not produce big basal signal at the testing circuit place; What testing circuit 6 was detected mainly is the detection signal through mutual capacitance 12, changes caused change in detection signal thereby can comparatively accurately survey mutual capacitance 12, thereby has avoided the detection failure problem that causes more greatly because of stray capacitance.
Further describe technical scheme of the present invention below in conjunction with specific embodiment.
With reference to figure 8; Show the synoptic diagram of touch display unit one embodiment of the present invention; Said touch display unit is the LCD touch display; Its display plane comprises the peripheral leads district 212 that touches viewing area 211 and this touch viewing area 211 of encirclement; In the touch viewing area 211 of touch display unit, said touch display unit is comprising image element array substrates 006, and the touch screen base plate 004 that is oppositely arranged of image element array substrates 006, is being arranged at the liquid crystal layer 005 between image element array substrates 006 and the touch screen base plate 004 on the printing opacity direction.Wherein touch screen base plate 004 relative liquid crystal layer 005 approach from a distance comprises successively: first transparency carrier 201, touch-control structure layer 202, insulation course 203, common electrode layer (ITO) 204; Liquid crystal layer 005 comprises a plurality of liquid crystal molecules 205; Image element array substrates 006 relative liquid crystal layer 005 is from comprising closely and far successively: pel array 206, second transparency carrier 207.In the time will realizing colored the demonstration, (Color Filter CF) serves as insulation course 203, also can between first transparency carrier 201 and touch-control structure layer 202, increase by a colored filter can to use colored filter.Said LCD touch display unit also comprises polaroid, backing structure etc., for concise and to the point, clear, does not illustrate in the drawings.
In peripheral lead district 212, the peripheral leads of image element array substrates 006 (comprising public electrode lead-in wire and sweep trace lead-in wire) is 212a with the overlapping region of the output lead (comprising drive electrode lead-in wire and induction electrode lead-in wire) of the touch-control structure layer 202 of touch screen base plate 004.At this overlapping region 212a place; Said touch display unit comprises first transparency carrier 201 and second transparency carrier 207 that is oppositely arranged, the peripheral leads 220 of the output lead 210 of the said touch-control structure layer 202 that sets gradually to second transparency carrier 207 from first transparency carrier 201, screen layer 209, insulation course 208, said pel array 206.
In conjunction with reference to figure 9; Show the schematic top plan view of touch screen base plate first embodiment shown in Figure 8; Clearer for the structure, the position that make screen layer, only illustrated screen layer 209, touch-control structure layer 202, the output lead 210 of touch-control structure layer 202, common electrode layer 204 among Fig. 9.
Present embodiment is an example with the touch-control structure layer of single-layer electrodes; Drive electrode and induction electrode are positioned at same one deck in the touch-control structure layer of single-layer electrodes; Particularly, at 211 places, said touch viewing area, said touch-control structure layer 202 comprises: a plurality of drive electrodes 2021 of arranging by row, the induction electrode 2022 of a plurality of bar shapeds; Each row drive electrode 2021 is spaced with induction electrode 2022, and drive electrode 2021 forms mutual capacitance with adjacent induction electrode 2022; Overlapping region 212a place at the output lead 210 of the touch-control structure layer 202 of the peripheral leads of image element array substrates and touch screen base plate; The output lead 210 of said touch-control structure layer 202 comprises drive electrode lead-in wire 2023 and induction electrode lead-in wire 2024; Said drive electrode 2021 links to each other with driving circuit (figure does not show) through drive electrode lead-in wire 2023, and induction electrode 2022 links to each other with testing circuit (figure does not show) through induction electrode lead-in wire 2024.
In overlapping region district 212a, said screen layer 209 is identical with common electrode layer 204 same one decks and material in touching viewing area 211, and screen layer 209 and common electrode layer 204 just can prepare simultaneously like this, need not extra preparation process.Particularly; The tin indium oxide that the material of said screen layer 209 is (ITO), the thickness of said screen layer 209 1000～1500
scope in.
In the present embodiment, said screen layer 209 comprises first screen layer 2091 and secondary shielding layer 2092, and said first screen layer 2091 and secondary shielding layer 2092 are for to be arranged at one deck, separate rectangular conductive film.Wherein, said first screen layer 2091 is arranged between the peripheral leads (comprising public electrode lead-in wire and sweep trace lead-in wire) of drive electrode lead-in wire 2023 and image element array substrates, and is electrically connected and the ground end at peripheral lead district 212a; Said secondary shielding layer 2092 is arranged between the peripheral leads (comprising public electrode lead-in wire and sweep trace lead-in wire) of induction electrode lead-in wire 2024 and image element array substrates, and is electrically connected and the ground end at peripheral lead district 212a.
As shown in Figure 9, common electrode layer 204 comprises a plurality of spaced first public electrodes 2041 and second public electrode 2042; First public electrode 2041 and drive electrode 2021 are over against setting on the printing opacity direction, and second public electrode 2042 and induction electrode 2022 are over against setting; All first public electrodes 2041 also hold 303 with receiving, and all second public electrodes 2042 also hold 304 with receiving.Can avoid drive electrode and induction electrode to produce coupling like this, further improve detection signal-to-noise ratio through stray capacitance with public electrode formation.
In the present embodiment, said first screen layer 2091 is electrically connected on first common electrode layer 2041 through connecting line (figure does not show), and then holds 303 with being electrically connected on; Said secondary shielding layer 2092 is electrically connected on second transparency conducting layer 2042 through connecting line (figure does not show), and then holds 304 with being electrically connected on.Need to prove; In first embodiment of the invention, said first screen layer 2091 can also be made of one with first public electrode 2041, that is to say that the ITO as first public electrode 2041 extends to the peripheral leads district; Cover said drive electrode lead-in wire 2023; Said secondary shielding layer 2092 can also be made of one with second public electrode 2042, that is to say that the ITO as second public electrode 2042 extends to the peripheral leads district, covers said induction electrode lead-in wire 2024.
Also need to prove; In first embodiment of the invention; Said public electrode comprises first public electrode 2041 and second public electrode 2042; Said first public electrode 2041 and second public electrode 2042 be ground connection respectively, but the present invention is not restricted to this, and said public electrode can be holistic public electrode; One of them of said first screen layer 2091 and secondary shielding layer 2092 held through public electrode with being connected in, can be through other assembly ground connection through the screen layer of public electrode ground connection.In addition, said first screen layer 2091 can not be connected in ground through public electrode with secondary shielding layer 2092 yet, as long as both distinguish ground connection, those skilled in the art can carry out corresponding modification, replacement and distortion according to the foregoing description.
The present invention also provides second embodiment of touch display unit; The difference of the present embodiment and first embodiment is; The touch-control structure layer is two-layer electrode touch-control structure, and promptly drive electrode and induction electrode lay respectively at different layers, and is provided with insulation course between said drive electrode and the induction electrode.With reference to Figure 10; Show the vertical view of touch screen base plate second embodiment in the touch display unit shown in Figure 8; Does touch-screen in the said touch display unit comprises draw together drive electrode 401 and induction electrode 402, said drive electrode? Generally include a plurality of drive electrodes by rows in 401, for example 6a, 6b, 6c, 6d, 6e, 6f, 6g, 6h; Generally include a plurality of induction electrodes of arranging, for example 5a, 5b, 5c, 5d, 5e, 5f, 5g, 5h in the said induction electrode 402 by row.Said drive electrode and said induction electrode overlap each other, form mutual capacitance.
Wherein, Peripheral leads district at touch display unit has output lead; Comprise drive electrode lead-in wire 405 and induction electrode lead-in wire 406; Said drive electrode lead-in wire 405 is used for drive electrode 401 is connected to driving circuit (figure does not show), and said induction electrode lead-in wire 406 is used for induction electrode 402 is connected to testing circuit (figure does not show).Because the peripheral leads of drive electrode lead-in wire 405 (induction electrode lead-in wire 406) and pel array (for example sweep trace lead-in wire or public electrode lead-in wire) has overlapping; Can produce big mutual capacitance; Said touch display unit also is provided with first screen layer 403 and secondary shielding layer 404 that is positioned at the peripheral leads district; Said first screen layer 403 is arranged between the peripheral leads of drive electrode lead-in wire 405 and pel array; And said secondary shielding layer 404 is held between the peripheral leads that is arranged at induction electrode lead-in wire 406 and pel array with being connected in, and said first screen layer 403 connects electricity respectively with secondary shielding layer 404 and holds with being connected to.
Correspondingly, the present invention also provides a kind of manufacturing approach that comprises above-mentioned touch display unit, said method comprising the steps of:
First transparency carrier is provided;
On said first transparency carrier, form the output lead of touch-control structure layer and touch-control structure layer, said touch-control structure layer is the single-layer electrodes touch-control structure, comprises spaced drive electrode and induction electrode; The output lead of touch-control structure layer comprises drive electrode lead-in wire and induction electrode lead-in wire;
On said touch-screen, attach colored filter;
Deposition forms common electrode layer on said colored filter; Form spaced first public electrode and second public electrode in the touch display unit viewing area; Said first public electrode and said drive electrode are over against setting, and said second public electrode and said induction electrode are over against setting;
In the process that forms first public electrode and second public electrode, form first screen layer that covers said drive electrode lead-in wire and link to each other and the secondary shielding layer that covers said induction electrode lead-in wire and link to each other with said second public electrode with said first public electrode;
Second transparency carrier is provided and forms pel array above that;
Between first transparency carrier and second transparency carrier, form liquid crystal layer, and subsides and said first transparency carrier, second transparency carrier.
Need to prove in the manufacturing approach of above-mentioned touch display unit; Said screen layer and common electrode layer are all transparent conductive material (ITO), therefore, and can be when the viewing area forms common electrode layer; Form screen layer in peripheral lead district; Therefore the manufacturing of touch display unit of the present invention can not increase processing step, but the present invention is not restricted to this, and said screen layer can also be other conductive materials; Because said screen layer is positioned at the peripheral leads district, therefore said screen layer can be selected conductive materials such as lighttight metal.
Need to prove that also in the foregoing description, said screen layer is arranged in the touch screen base plate; But the present invention is not restricted to this, and said screen layer can also be arranged in the image element array substrates, also need to prove; In the foregoing description, be example with the liquid crystal indicator, but the present invention does not limit therewith; Can also be organic electroluminescent LED (OLED) display device, those skilled in the art can correspondingly be out of shape, revise and replace according to the foregoing description.
Though the present invention with preferred embodiment openly as above; But it is not to be used for limiting the present invention; Any those skilled in the art are not breaking away from the spirit and scope of the present invention; Can utilize the method and the technology contents of above-mentioned announcement that technical scheme of the present invention is made possible change and modification, therefore, every content that does not break away from technical scheme of the present invention; To any simple modification, equivalent variations and modification that above embodiment did, all belong to the protection domain of technical scheme of the present invention according to technical spirit of the present invention.
Claims (21)
1. touch display unit comprises: touch screen base plate, the image element array substrates that is oppositely arranged with touch screen base plate; Be provided with the peripheral leads of pel array and pel array in the said image element array substrates, be provided with the output lead of touch-control structure layer and touch-control structure layer in the said touch screen base plate; Said touch-control structure layer comprises drive electrode and induction electrode, and the output lead of said touch-control structure layer comprises drive electrode lead-in wire and induction electrode lead-in wire; The output lead of touch-control structure layer and the peripheral leads of said pel array overlap on the printing opacity direction; It is characterized in that said touch display unit also comprises first screen layer between the peripheral leads that is arranged at said drive electrode lead-in wire and said pel array; Be arranged at the secondary shielding layer between the peripheral leads of said induction electrode lead-in wire and said pel array.
2. touch display unit as claimed in claim 1 is characterized in that, said first screen layer, said secondary shielding layer are held respectively with being electrically connected on.
3. touch display unit as claimed in claim 1 is characterized in that, said peripheral leads comprises public electrode lead-in wire and sweep trace lead-in wire.
4. touch display unit as claimed in claim 1 is characterized in that, the display plane of said touch display unit comprises the touch viewing area that is used for image demonstration and touch sensible, the peripheral leads district that is placed with a plurality of leads; Said pel array and said touch-control structure layer are oppositely arranged in said touch viewing area; The output lead of the peripheral leads of said pel array and said touch-control structure layer is oppositely arranged in said peripheral leads district.
5. touch display unit as claimed in claim 4 is characterized in that said touch screen base plate also comprises first transparency carrier, and the output lead of said touch-control structure layer and touch-control structure layer is arranged on said first transparency carrier; Said image element array substrates also comprises second transparency carrier, and the peripheral leads of said pel array and pel array is arranged on said second transparency carrier.
6. touch display unit as claimed in claim 5; It is characterized in that; In said peripheral leads district; Said touch display unit comprises first transparency carrier and second transparency carrier that is oppositely arranged, the peripheral leads of the output lead of the said touch-control structure layer that sets gradually to second transparency carrier from first transparency carrier, screen layer, insulation course, said pel array.
7. touch display unit as claimed in claim 6 is characterized in that, said insulation course comprises passivation layer and/or envelope frame glue.
8. touch display unit as claimed in claim 5 is characterized in that, in said touch viewing area, said touch display unit also comprises the liquid crystal layer that is arranged between said image element array substrates and the said touch screen base plate; The said relatively liquid crystal layer of said touch screen base plate approach from a distance comprises successively: first transparency carrier, touch-control structure layer, insulation course, common electrode layer; The said relatively liquid crystal layer of said image element array substrates is from comprising closely and far successively: pel array, second transparency carrier.
9. touch display unit as claimed in claim 8 is characterized in that, said insulation course is a colored filter.
10. touch display unit as claimed in claim 8 is characterized in that, said first screen layer and secondary shielding layer are arranged in the said touch screen base plate, is positioned at same one deck with said common electrode layer.
11. touch display unit as claimed in claim 10 is characterized in that, the material of said first screen layer and secondary shielding and said common electrode layer is tin indium oxide.
12. touch display unit as claimed in claim 10 is characterized in that, the material of said first screen layer and secondary shielding is a metal material.
13. in the touch display unit as claimed in claim 5, it is characterized in that said touch-control structure layer is the single-layer electrodes touch-control structure, said drive electrode and induction electrode are a plurality of and are spaced.
14. touch display unit as claimed in claim 13 is characterized in that, said common electrode layer comprises a plurality of spaced first public electrodes and second public electrode; First public electrode and drive electrode are over against setting on the printing opacity direction, and second public electrode and induction electrode are over against setting; All first public electrodes are also held with receiving, and all second public electrodes are also held with receiving.
15. touch display unit as claimed in claim 14 is characterized in that, said first screen layer is electrically connected with said first common electrode layer, and said secondary shielding layer is electrically connected with said second common electrode layer.
16. touch display unit as claimed in claim 15 is characterized in that, said first screen layer and said first common electrode layer are an integral body, and said secondary shielding layer and said second common electrode layer are an integral body.
17. touch display unit as claimed in claim 5 is characterized in that, said touch-screen is two-layer electrode touch-control structure.
18. touch display unit as claimed in claim 5 is characterized in that, said common electrode layer is an integral body, and one of them of said first screen layer, secondary shielding layer is connected in common electrode layer.
19., it is characterized in that said first screen layer and secondary shielding are arranged in the image element array substrates like each described touch display unit among the claim 1-18.
20. like each described touch display unit among the claim 1-18, said touch display unit is liquid crystal indicator or organic electroluminescent LED display device.
21. the manufacturing approach of a touch display unit is characterized in that, comprising:
First transparency carrier is provided;
On said first transparency carrier, form the output lead of touch-control structure layer and touch-control structure layer; Said touch-control structure layer is the single-layer electrodes touch-control structure; Comprise spaced drive electrode and induction electrode, the output lead of touch-control structure layer comprises drive electrode lead-in wire and induction electrode lead-in wire;
On said touch-screen, attach colored filter;
Deposition forms common electrode layer on said colored filter; Form spaced first public electrode and second public electrode in the touch display unit viewing area; Said first public electrode and said drive electrode are over against setting, and said second public electrode and said induction electrode are over against setting;
In the process that forms first public electrode and second public electrode, form first screen layer that covers said drive electrode lead-in wire and link to each other and the secondary shielding layer that covers said induction electrode lead-in wire and link to each other with said second public electrode with said first public electrode;
Second transparency carrier is provided and forms pel array above that;
Between first transparency carrier and second transparency carrier, form liquid crystal layer.
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