CN102338945A - Touch liquid crystal display and color filter substrate - Google Patents
Touch liquid crystal display and color filter substrate Download PDFInfo
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- CN102338945A CN102338945A CN2010102347530A CN201010234753A CN102338945A CN 102338945 A CN102338945 A CN 102338945A CN 2010102347530 A CN2010102347530 A CN 2010102347530A CN 201010234753 A CN201010234753 A CN 201010234753A CN 102338945 A CN102338945 A CN 102338945A
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Abstract
The invention relates to a touch liquid crystal display and a color filter substrate for the same. The color filter substrate comprises a common electrode layer and a touch electrode. The touch electrode comprises a driving electrode and an induction electrode. The common electrode layer comprises a driving common electrode and an induction common electrode which are separated from each other. The driving common electrode corresponds to the driving electrode to form a driving parasitic capacitance. The induction common electrode corresponds to the induction electrode to form an induction parasitic capacitance. The driving common electrode and the induction common electrode are connected to a common voltage output end. The touch liquid crystal display and the color filter substrate which are disclosed by the invention cannot generate a current path which passes through the parasitic capacitances in a driving detection circuit, so that a large substrate signal cannot be formed at the position of the detection circuit, and thus, the problem of detection failure caused by the high parasitic capacitances can be avoided.
Description
Technical field
The present invention relates to the touch display field, particularly a kind of touch LCD display and a kind of colored filter substrate that is applied in the said touch LCD display.
Background technology
Touch-screen is the simplest, convenient, natural at present a kind of man-machine interaction mode as a kind of input media.Therefore, touch-screen is applied in the various electronic products more and more, for example mobile phone, notebook computer, MP3/MP4 etc.For reducing the cost of various electronic equipments, make various electronic equipments more frivolous, touch-screen is integrated in the display panels usually.
Different according to the medium of principle of work and senses touch information, touch-screen can be divided into four types of resistance-types, condenser type, infrared-type, surface acoustic wave.The capacitive touch screen technology becomes the touch screen technology of present main flow owing to having technology is simple, the life-span is long, transmittance is high reason.
With reference to figure 1, show the cross-sectional view of the mutual capacitance type touch-screen of prior art.Said mutual capacitance type touch-screen comprises: glass substrate 10, be formed at the Drive Layer 11 on the glass substrate 10, and be formed at the insulation dielectric layer 12 on the Drive Layer 11, be formed at the inductive layer 13 on the insulation dielectric layer 12, and be formed at the protective seam 14 on the inductive layer 13.
In conjunction with reference to figure 2; Show the synoptic diagram of Drive Layer 12 shown in Figure 1, said Drive Layer 12 comprises a plurality of drive electrodes 111, and each drive electrode is a brilliant; Said a plurality of drive electrode 111 is regularly arranged, is electrically connected through many parallel drive wire 11a, 11b, 11c, 11d...... respectively.
Combine again with reference to figure 3; Show the synoptic diagram of inductive layer 13 shown in Figure 1; Said inductive layer 13 comprises a plurality of induction electrodes 131; Each induction electrode 131 is a brilliant, and said a plurality of induction electrode 131 is regularly arranged, is electrically connected through many parallel line of induction 13a, 13b, 13c, 13d...... respectively.
Wherein, drive wire 11a, 11b, 11c, 11d...... and line of induction 13a, 13b, 13c, 13d...... are orthogonal, and every line of induction 13a, 13b, 13c, 13d...... are electrically connected with testing circuit 30 through gating switch module 20.
Form mutual capacitance between induction electrode 131 and the drive electrode 111, testing circuit changes through measuring the caused mutual capacitance of finger touches touch-screen, obtains the position that finger touches touch-screen.
In conjunction with referring to figs. 2 and 3, the driving testing principle of touch-screen is: is that example describes with drive wire 11a earlier, applies driving voltage 40 on the drive wire 11a; Other drive wire 11b, 11c, 11d...... ground connection, line of induction 13a is connected with testing circuit 30 through gating switch module 20, and that at this moment detect is drive wire 11a and line of induction 13a; Finger touch has touching signals, then at the intersection point place of these two lines; Through gating switch module 20 more successively with line of induction 13b, 13c, 13d...... links to each other with testing circuit 30; Detect drive wire 11a and line of induction 13b, 13c, the signal at 13d...... intersection point place this moment; Afterwards; Apply driving voltage successively for drive wire 11b, 11c, 11d......; Turntable driving line 11b, 11c, 11d...... accomplish scanning process successively, accomplish like this all drive wire 11a, 11b, 11c, 11d...... and all line of induction 13a, 13b; 13c, the scanning of 13d...... intersection point.
With reference to figure 4; Show the schematic equivalent circuit of touch-screen shown in Figure 1; Said equivalent electrical circuit comprises: the mutual capacitance 53 between signal source 51, drive electrode resistance 52, drive electrode and the induction electrode, the driving stray capacitance 54 of drive electrode self, the induction stray capacitance 60 of induction electrode self, induction electrode resistance 55, testing circuit 56.Wherein, signal source 51 is used on drive electrode, applying drive signal; Testing circuit 56 then is used to carry out input.When finger touched touch-screen, some electric current flowed into finger, and equivalence is the change of the mutual capacitance 53 between drive electrode and the induction electrode, measured said mutual capacitance from testing circuit 56 and changed the weak current variation that causes.
The above is the touch screen structure of existing a kind of multi-layered electrode, and promptly Drive Layer and inductive layer are positioned at different layers, with reference to figure 5, shows the structural representation of the touch-screen of a kind of single-layer electrodes of prior art.In said single-layer touch screen, Drive Layer and inductive layer are positioned at same one deck, and Drive Layer comprises a plurality of drive electrodes 71, and is regularly arranged into multirow drive electrode 71a, 71b, 71c, 71d and 71e, and the drive electrode of each row couples together through the drive wire of periphery; Inductive layer comprises a plurality of induction electrodes 72; And induction electrode 72 is spaced with the drive electrode 71 of every row; Each drive electrode 71 forms mutual capacitance with adjacent induction electrode 72, and the equivalent electrical circuit of the touch-screen of single-layer electrodes is identical with equivalent electrical circuit shown in Figure 4.
In order to make the LCD that has touch function more frivolous; Field of liquid crystal display has developed embedded touch-screen (In-cell touch panel) technology; With reference to figure 6, show the synoptic diagram of the liquid crystal indicator that comprises embedded touch function, said LCD is from the bottom to top; Comprise successively: thin film transistor (TFT) (TFT; Thin Film Transistor) substrate, liquid crystal layer 63 and colored filter (CF, Color Filter) substrate, wherein; The TFT substrate comprises: lower glass substrate 61, be positioned at the tft layer 62 on the lower glass substrate 61, the CF substrate comprises from the bottom to top successively: common electrode layer 64, insulating medium layer 65 (or adopting colored filter as dielectric layer), touch electrode 66, top glass substrate 67.
Wherein, Touch electrode 66 can be multilayer touch electrode or single-layer touch electrode; Spacing is several microns between said touch electrode 66 and the common electrode layer 64; Because spacing is less, can form bigger electric capacity between touch electrode 66 and the common electrode layer 64, said electric capacity is the stray capacitance of touch electrode 66.
Yet bigger stray capacitance can influence the detection of mutual capacitance, with reference to figure 7, shows the schematic equivalent circuit of touch-screen shown in Figure 6.As shown in Figure 7, when driving stray capacitance 54 and induction stray capacitance 60 are big, for the AC signal that signal source 51 is sent; Its capacitive reactance is less; Public electrode resistance 57 then hinders AC signal inflow place end with public electrode inductance 58, and therefore, AC signal is successively through the less driving stray capacitance 54 of capacitive reactance, induction stray capacitance 60; Form current path 18, AC signal is through forming bigger basal signal at testing circuit 56 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 56 be difficult to detect mutual capacitance and change corresponding signal, cause and detect failure.
The inventor finds; When the electric capacity that drives stray capacitance 54 and induction stray capacitance 60 is 500pF; As long as the public electrode inductance 58 of 2 ohm public electrode resistance 57 and 50 nanohenrys will make mutual capacitance detect failure; Yet in side circuit, so small public electrode resistance and public electrode inductance is unavoidable.
Summary of the invention
The present invention will solve is the problem that detection that the stray capacitance between touch electrode and public electrode causes was lost efficacy, and a kind of touch LCD display that can the stable detection touch signal is provided.
For addressing the above problem; The present invention provides a kind of touch LCD display; It comprises common electrode layer and touch electrode, and said touch electrode comprises drive electrode and induction electrode, and said common electrode layer comprises driving public electrode disconnected from each other and induction public electrode; Said driving public electrode is corresponding with drive electrode, forms to drive stray capacitance; Said induction public electrode is corresponding with induction electrode, forms the induction stray capacitance; Said driving public electrode is connected in the common electric voltage output terminal with the induction public electrode.
Said touch LCD display also comprises a substrate, and said touch electrode and said common electrode layer are set in turn in said substrate, and said driving public electrode and said drive electrode are over against setting, and said induction public electrode and said induction electrode are over against setting.
Said induction electrode and drive electrode are positioned at same one deck; Said induction electrode comprises a plurality of strip shaped electric poles; Said drive electrode is arranged between the induction electrode; Said induction public electrode comprises a plurality of strip shaped electric poles, and said driving public electrode comprises a plurality of strip shaped electric poles that are arranged between the said induction public electrode.
Said driving public electrode and said induction public electrode are positioned at same one deck.
Said touch LCD display also comprises driving connecting line and induction connecting line, and said driving public electrode is connected in the common electric voltage output terminal through driving connecting line, and said induction public electrode is connected in the common electric voltage output terminal through the induction connecting line.
Said touch LCD display also comprises a flexible printed circuit board; Said flexible printed circuit board comprises common electric voltage generating module, first connecting line and second connecting line; Wherein, said common electric voltage generating module is used to produce common electric voltage, and said common electric voltage output terminal is arranged at the common electric voltage generating module; Said first connecting line is used to connect the common electric voltage output terminal and drives connecting line, and said second connecting line is used to connect common electric voltage output terminal and induction connecting line.
Said flexible printed circuit board also comprises a touch electrode module, and said touch electrode module is used for to touch electrode output drive signal and detection signal.
Said common electric voltage generating module and said touch electrode module are integrated in the same chip; Said chip comprises the first common electric voltage output terminal and the second common electric voltage output terminal; The said first common electric voltage output terminal and the second common electric voltage output terminal are connected the common electric voltage output terminal of said common electric voltage generating module respectively; Wherein the first common electric voltage output terminal is connected in first connecting line, and the second common electric voltage output terminal is connected in second connecting line.
Said common electric voltage output terminal is a direct current common electric voltage output terminal.
Said dc voltage output end is an earth terminal.
Said touch LCD display also comprises a flexible printed circuit board, and said flexible printed circuit board comprises deposited copper, and said earth terminal is the deposited copper of said flexible printed circuit board.
Said common electric voltage output terminal is an interchange common electric voltage output terminal.
Said touch LCD display is a mutual capacitance type touch LCD display.
Correspondingly; The present invention also provides a kind of colored filter substrate that is used for the touch LCD display; Said colored filter substrate comprises common electrode layer and touch electrode; Said touch electrode comprises drive electrode and induction electrode, and said colored filter substrate comprises common electrode layer, and said common electrode layer comprises driving public electrode disconnected from each other and induction public electrode; Said driving public electrode is corresponding with drive electrode, and said induction public electrode is corresponding with induction electrode.
Said colored filter substrate also comprises a glass substrate; Said touch electrode and said common electrode layer are set in turn in said glass substrate; Said driving public electrode and said drive electrode are over against setting, and said induction public electrode and said induction electrode are over against setting.
Said induction electrode and drive electrode are positioned at same one deck; Said induction electrode comprises a plurality of strip shaped electric poles; Said drive electrode is arranged between the induction electrode; Said induction public electrode comprises a plurality of strip shaped electric poles, and said driving public electrode comprises a plurality of strip shaped electric poles that are arranged between the said induction public electrode.
Said driving public electrode and said induction public electrode are positioned at same one deck.
Said colored filter substrate also comprises driving connecting line and induction connecting line, and said driving public electrode is connected in the common electric voltage output terminal through said driving connecting line, and said induction public electrode is connected in the common electric voltage output terminal through said induction connecting line.
Said colored filter substrate also comprises the insulating medium layer between touch electrode and common electrode layer.
Said insulating medium layer comprises colored filter.
Compared with prior art; The present technique scheme has the following advantages: said touch LCD display; Comprise and independently drive public electrode and induction public electrode mutually; Said driving public electrode links to each other with the common electric voltage output terminal respectively with the induction public electrode; And respectively with drive driving stray capacitance that public electrode forms, form the induction stray capacitance with induction electrode; Greatly reduce and drive shared public electrode resistance and public electrode inductance between public electrode to common electric voltage output terminal loop and induction public electrode to the common electric voltage output terminal loop, thereby can not form bigger basal signal, and then can avoid detecting the problem of failure at the testing circuit place.
Description of drawings
Fig. 1 is the cross-sectional view of the mutual capacitance type touch-screen of prior art;
Fig. 2 is the synoptic diagram of Drive Layer shown in Figure 1;
Fig. 3 is the synoptic diagram of inductive layer shown in Figure 1;
Fig. 4 is the schematic equivalent circuit of touch-screen shown in Figure 1;
Fig. 5 is the structural representation of the touch-screen of a kind of single-layer electrodes of prior art;
Fig. 6 is the synoptic diagram of the LCD of the embedded touch function of prior art;
Fig. 7 is the schematic equivalent circuit of touch-screen shown in Figure 6;
Fig. 8 is a touch LCD display schematic equivalent circuit of the present invention;
Fig. 9 is the synoptic diagram of touch LCD display one embodiment of the present invention;
Figure 10 is the drive unit synoptic diagram of prior art touch LCD display;
Figure 11 is the synoptic diagram of drive unit one embodiment of touch LCD display of the present invention;
Figure 12 is the synoptic diagram of touch LCD display flexible printed circuit board (PCB) one embodiment of the present invention;
Figure 13 is the synoptic diagram of touch electrode chip one embodiment shown in Figure 12;
Figure 14 is the synoptic diagram of another embodiment of touch LCD display flexible printed circuit board (PCB) of the present invention;
Figure 15 is the synoptic diagram of colored filter substrate one embodiment 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.
In the prior art; Has bigger stray capacitance between the drive electrode of touch LCD display and induction electrode and public electrode; In testing circuit, form current path easily through said stray capacitance; Thereby make the bigger basal signal of testing circuit output, cause testing circuit can't detect the mutual capacitance variation that finger touch causes, cause detecting failure.
To the problems referred to above, the present invention provides a kind of touch LCD display, comprises common electrode layer and touch electrode, and said touch electrode comprises drive electrode and induction electrode, and said common electrode layer comprises driving public electrode disconnected from each other and induction public electrode; Said driving public electrode is corresponding with drive electrode, forms to drive stray capacitance; Said induction public electrode is corresponding with induction electrode, forms the induction stray capacitance; Said driving public electrode is connected in the common electric voltage output terminal with the induction public electrode.When touch electrode is driven detection; Because driving public electrode is separated from each other with the induction public electrode; And be connected in the common electric voltage output terminal; Greatly reduce and drive shared public electrode resistance and public electrode inductance between public electrode to common electric voltage output terminal loop and induction public electrode to the common electric voltage output terminal loop; Thereby can not form bigger basal signal, what testing circuit detected mainly is the signal that changes corresponding to mutual capacitance, and then can avoid detecting the problem of failure.
Below in conjunction with touch LCD display schematic equivalent circuit of the present invention shown in Figure 8, further describe the design concept of touch LCD display of the present invention.
In said schematic equivalent circuit, the common electric voltage output terminal holds 100 with being.Because driving public electrode hold 100 with the induction public electrode with being connected to, drives public electrode and form with drive electrode and drive stray capacitance 101, respond to public electrode and stray capacitance 201 is responded in induction electrode formation; So driving stray capacitance 101 connects with driving public electrode resistance 102, driving public electrode inductance 103 successively; Link to each other with ground end 100 then; Similarly; Induction stray capacitance 201 is also connected with induction public electrode resistance 202, induction public electrode inductance 203 successively, links to each other with ground end 100 then.
When mutual capacitance 53 is driven detection; The AC signal that signal source 51 is sent is through after the drive electrode resistance 52; Most of AC signal arrives testing circuit 56 through mutual capacitance 53, induction electrode resistance 55; Few part AC signal is led ground end 100 through driving stray capacitance 101, driving public electrode resistance 102, driving public electrode inductance 103 successively; Perhaps lead ground end 100 through induction stray capacitance 201, induction public electrode resistance 202, induction public electrode inductance 203 successively; Greatly reduce and drive shared public electrode resistance and public electrode inductance between public electrode to common electric voltage output terminal loop and induction public electrode to the common electric voltage output terminal loop, also can not produce big basal signal at the testing circuit place, what testing circuit 56 was detected mainly is the detection signal through mutual capacitance 53; Change caused change in detection signal thereby can comparatively accurately survey mutual capacitance 53, thereby avoided the detection failure problem that causes more greatly because of stray capacitance.
Specify specific embodiment of the present invention below in conjunction with accompanying drawing, further describe technical scheme of the present invention.
With reference to figure 9, show the synoptic diagram of touch LCD display one embodiment of the present invention.Wherein, said touch LCD display comprises from the bottom to top successively: lower glass substrate 317, TFT layer 316, liquid crystal layer 315, common electrode layer 314, insulating medium layer 313, touch electrode 312, top glass substrate 311.
In the present embodiment; Touch electrode 312 is the single-layer touch electrode; Its structure is identical with touch electrode shown in Figure 5, and touch electrode 312 comprises the Drive Layer 304 and inductive layer 305 that is positioned at one deck, and said Drive Layer 304 comprises a plurality of drive electrode 304a, 304b, 304c and 304d that are regularly arranged into multiple row; Said induction 305 comprises induction electrode 305a, 305b, 305c and the 305d that many rules are arranged; Wherein, said multiple row drive electrode 304a, 304b, 304c and 304d and said many induction electrode 305a, 305b, 305c and 305d are spaced, and form mutual capacitance 308 between adjacent drive electrode and induction electrode.
Insulating medium layer 313 is used to make insulation between touch electrode 312 and the common electrode layer 314, and said insulating medium layer 313 can be a colored filter.
That common electrode layer 314 comprises is disconnected from each other, independently drive public electrode 306 and induction public electrode 307 separately, wherein,
Drive public electrode 306 and comprise a plurality of driving public electrode 306a, 306b, 306c and 306d; Induction public electrode 307 comprises a plurality of induction public electrode 307a, 307b, 307c and 307d; In the present embodiment; The drive electrode of said driving public electrode 306 and touch electrode is over against being provided with and forming stray capacitance, and the induction electrode of said induction public electrode 307 and touch electrode is over against being provided with and the formation stray capacitance.
With touch electrode 312 accordingly, said induction public electrode 306 is a strip shaped electric poles, said driving public electrode 306 be arranged at the induction public electrode 307 between, with the induction public electrode 307 be spaced, said driving public electrode 306 also is a strip shaped electric poles.
Said driving public electrode 306a, 306b, 306c and 306d and said induction public electrode 307a, 307b, 307c and 307d are by forming through etch separates with one deck electrode.
Said touch LCD display also comprises driving connecting line 309 and induction connecting line 310; Wherein, Drive connecting line 309 and be used for said a plurality of driving public electrode 306a, 306b, 306c and 306d are connected in common electric voltage output terminal (figure does not show), induction connecting line 310 is used for said a plurality of induction public electrode 307a, 307b, 307c and 307d are connected in common electric voltage output terminal (figure does not show).
In the present embodiment, said common electrode layer 314 comprises that drive electrode 304a, 304b, 304c, 304d with touch electrode 313 drive public electrode 306a, 306b, 306c, 306d accordingly; Comprise that also induction electrode 305a, 305b, 305c, 305d with touch electrode 313 respond to public electrode 307a, 307b, 307c, 307d accordingly, said driving public electrode 306a, 306b, 306c, 306d and induction public electrode 307a, 307b, 307c, 307d are separated from each other.When touch electrode is driven detection; Said driving public electrode 306a, 306b, 306c, 306d and drive electrode 304a, 304b, 304c, 304d form and drive stray capacitance and be connected in the common electric voltage output terminal through driving connecting line 309, and said induction public electrode 307a, 307b, 307c, 307d and induction electrode 305a, 305b, 305c, 305d form the induction stray capacitance and be connected in the common electric voltage output terminal through induction connecting line 310.The situation of holding for the common electric voltage output terminal with being; Through the ground end that the AC signal that drives stray capacitance imports and the driving public electrode links to each other; Signal through the induction stray capacitance imports the ground end that links to each other with the induction public electrode; Reduced drive public electrode 306a, 306b, 306c, 306d to common electric voltage output terminal loop and induction public electrode 307a, 307b, 307c, 307d to public electrode resistance and common electrode inductance shared between the common electric voltage output terminal loop; Thereby can not form bigger basal signal, and then can avoid because of the big problem that causes detecting failure of stray capacitance at the testing circuit place.
The touch LCD display also comprises drive unit; Said drive unit is used to provide the touch LCD display to be used for source electrode to TFT to be provided image display signal, switching signal is provided, provides to touch electrode and drive detection signal, to public electrode public voltage signal be provided to the grid of TFT; Particularly; Said drive unit is flexible printed circuit board (FPC, Flexibl Print Circuit).
With reference to Figure 10, show the drive unit synoptic diagram of prior art touch LCD display.In the prior art, the touch LCD display comprises the circuit of display driving 43 that is positioned on the TFT substrate, and said circuit of display driving 43 comprises the chip for driving 45 that is used to provide public voltage signal, and said chip for driving 45 comprises the common electric voltage output terminal.In order to make chip for driving 45 realize being electrically connected with common electrode layer 64; Common electrode layer 64 needs and chip for driving 45 couples together through lead 44 (electrical connection of 45 of lead 44 expressions common electrode layer 64 and chip for driving is not represented actual wire) here.
In touch LCD display of the present invention, common electrode layer is divided into a plurality of driving public electrodes that are intervally arranged and induction public electrode, and this needs many connecting lines to realize driving being electrically connected of public electrodes and induction public electrode and peripheral circuit.Simultaneously,, link to each other with the connecting line that is positioned at the CF substrate, when adopting type of drive shown in Figure 10, need a plurality of conducting spheres that the common electric voltage output terminal of many connecting lines and chip for driving is linked together in order to make chip for driving because chip for driving is positioned at the TFT substrate.
The inventor finds that this mode has more shortcoming: at first, because lead-in wire needs more conducting sphere more at most, more conducting sphere can take the space of LCD; Secondly, be the situation of common ground for the common electric voltage output terminal, need many common ground that are intervally arranged of design on the lower glass substrate, complex design, wasting space; Once more, many common ground can increase public electrode resistance on conducting sphere and the lower glass substrate, influence display effect.
Therefore the inventor considers to design a kind of drive unit of new touch LCD display, to overcome above-mentioned defective.
With reference to Figure 11, show the synoptic diagram of another embodiment of touch LCD display of the present invention.Said touch LCD display comprises drive unit, and said drive unit comprises: circuit of display driving 701 and touch electrode driving circuit 702, wherein,
Circuit of display driving 701 links to each other with lower glass substrate 317, and circuit of display driving 701 comprises chip for driving 703, and being used for source electrode to TFT provides image display signal, to the grid of TFT switching signal is provided;
Touch electrode driving circuit 702 is positioned on the substrate of touch electrode 312 1 sides, and being used for provides driving and detection signal to touch electrode 312, also is used for to common electrode layer 314 common electric voltage being provided;
Particularly; Said touch electrode driving circuit 702 is a flexible printed circuit board, and said flexible printed circuit board comprises common electric voltage generating module, first connecting line and second connecting line, wherein; Said common electric voltage generating module is used to produce common electric voltage; Said common electric voltage generating module comprises the common electric voltage output terminal, and said first connecting line is used to connect the common electric voltage output terminal and drives connecting line, and said second connecting line is used to connect common electric voltage output terminal and induction connecting line.
In addition, said flexible printed circuit board also comprises a touch electrode module, and said touch electrode module is used for to touch electrode output drive signal and detection signal.
In said drive unit; Touch electrode driving circuit touch electrode driving circuit is positioned on the substrate of touch electrode 312 1 sides; The touch electrode driving circuit; Only need a small amount of lead-in wire or golden finger just can realize the electrical connection of common electrode layer and common electric voltage output terminal, need not to use conducting sphere, thereby saving space, simplicity of design, avoid significantly increasing public electrode resistance.
The inventor has also designed the flexible printed circuit board as the touch electrode driving circuit; The common electric voltage output terminal of the touch electrode chip on the touch electrode driving circuit is connected with induction common electrical limit with the driving public electrode with the induction connecting line through driving connecting line respectively; Drive shared public electrode resistance and common electrode inductance between public electrode to common electric voltage output terminal loop and induction public electrode to the common electric voltage output terminal loop thereby further reduce, raising touches the sensitivity that detects.
With reference to Figure 12, show the synoptic diagram of touch electrode driving circuit one embodiment shown in Figure 11.The touch electrode driving circuit comprises flexible printed circuit board 505, and said flexible printed circuit board 505 comprises: first web member 501, first connecting line 502, second connecting line 503 and the first touch electrode chip 504, wherein,
The first touch electrode chip 504 comprises the common electric voltage generating module, is used to produce common electric voltage.See also Figure 13, show the synoptic diagram of touch electrode chip 504 1 embodiment shown in Figure 12, the said first touch electrode chip 504 comprises the first common electric voltage output terminal 511 and the second common electric voltage output terminal 512;
First connecting line, 502, one ends link to each other with driving connecting line 309 through first web member 501, and the other end is connected in the first common electric voltage output terminal 511;
Second connecting line, 503, one ends link to each other with induction connecting line 310 through first web member 501, and the other end is connected in the second common electric voltage output terminal 512.
The said first touch electrode chip 504 can also comprise the touch electrode module, and being used for provides detection and drive signal to touch-screen.Said touch electrode module and common electric voltage generation module are integrated in the said first touch electrode chip 504.
Said touch electrode driving circuit is positioned on the substrate of touch electrode 312 1 sides; Only need a small amount of lead-in wire or golden finger just can realize the electrical connection of common electrode layer and common electric voltage output terminal; Need not to use conducting sphere, thereby save space, simplicity of design, avoid significantly increasing public electrode resistance.The touch electrode driving circuit.
For the first touch electrode chip 504, please refer again to Figure 13, the touch electrode chip comprises common electric voltage generating module 5041, driving lead 5043, sensor wire 5043, wherein,
Common electric voltage generating module 5041 is used to produce common electric voltage, and said common electric voltage generating module 5041 comprises common electric voltage output terminal 513, the common electric voltage that said common electric voltage generating module 5041 is produced through 513 outputs of common electric voltage output terminal;
Driving lead 5043, one ends are connected in the first common electric voltage output terminal 511, and the other end is connected in common electric voltage output terminal 513;
Particularly, said driving lead 5043 and sensor wire 5042 are connected together at the Local Force Company near common electric voltage generating module 5041, are connected in common electric voltage output terminal 513 then.
In the present embodiment, said common electric voltage output terminal 513 can be a direct current common electric voltage output terminal, also can be to exchange the common electric voltage output terminal.Said dc voltage output end is the system earth end.
In the embodiment of the first touch electrode chip shown in Figure 12; Said driving lead 5043 and sensor wire 5042; Be connected together at the Local Force Company of ten minutes near common electric voltage generating module 5041; Be connected in common electric voltage output terminal 513 then; Can reduce the distance of common electrode layer, therefore reduce to drive shared public electrode resistance and common electrode inductance between public electrode to common electric voltage output terminal loop and induction public electrode to the common electric voltage output terminal loop greatly, improve the sensitivity that touch detects to common electric voltage generating module 5041;
With reference to Figure 14, show the synoptic diagram of another embodiment of touch electrode driving circuit shown in Figure 11.The touch electrode driving circuit comprises flexible printed circuit board 601, and said flexible printed circuit board 601 comprises: second web member 602, first connecting line 603, second connecting line 604, systematically hold the 605 and second touch electrode chip 606, wherein,
Second web member 602 is used for connecting the driving connecting line 309 and first connecting line 603, also is used for simultaneously connecting the induction connecting line 310 and second connecting line 604, and particularly, said second web member 602 is a golden finger;
The second touch electrode chip 606 comprises the touch electrode module, and being used for provides detection and drive signal to touch-screen.
Saidly systematically hold 605, be used to provide the common electric voltage output terminal, in the present embodiment, said common electric voltage output terminal is earth terminal, and is concrete, and said earth terminal is for applying copper;
First connecting line, 603, one ends link to each other with driving connecting line 309 through second web member 602, and the other end is connected in systematically holds 605;
Second connecting line, 604, one ends link to each other with induction connecting line 310 through second web member 602, and the other end is connected in systematically holds 605.
In touch LCD display flexible printed circuit board (PCB) shown in Figure 14, drive public electrode and induction public electrode and all link to each other with systematically holding.
Correspondingly; The present invention also provides a kind of colored filter substrate that is used for the touch LCD display; With reference to Figure 15, show the synoptic diagram of colored filter substrate one embodiment of the present invention, wherein; Colored filter substrate comprises from the bottom to top successively: common electrode layer 414, insulating medium layer 413, touch electrode 412, top glass substrate 411.
In the present embodiment; Touch electrode 412 is the single-layer touch electrode; Touch electrode 412 comprises the Drive Layer 404 and inductive layer 405 that is positioned at one deck; Said Drive Layer 404 comprises a plurality of drive electrode 404a, 404b, 404c, 404d that are regularly arranged into multiple row, and said inductive layer 405 comprises induction electrode 405a, 405b, 405c, the 405d that many rules are arranged, wherein; Said multiple row drive electrode 404a, 404b, 404c, 404d and said many induction electrode 405a, 405b, 405c, 405d are spaced, and form mutual capacitance 408 between adjacent drive electrode and induction electrode.
Insulating medium layer 413 is used to make insulation between touch electrode 412 and the common electrode layer 414, and said insulating medium layer 413 can be a colored filter.
That common electrode layer 414 comprises is disconnected from each other, independently drive public electrode 406 and induction public electrode 407 separately, wherein,
Drive public electrode 406 and comprise a plurality of driving public electrode 406a, 406b, 406c, 406d; Induction public electrode 407 comprises a plurality of induction public electrode 407a, 407b, 407c, 407d; In the present embodiment; The drive electrode of said driving public electrode 406 and touch electrode 412 is over against being provided with and forming stray capacitance, and the induction electrode of said induction public electrode 407 and touch electrode 412 is over against being provided with and the formation stray capacitance.
With touch electrode 412 accordingly, said induction public electrode 407 is a strip shaped electric poles, said driving public electrode 406 be arranged at the induction public electrode 407 between, with the induction public electrode 407 be spaced, said driving public electrode 406 is a strip shaped electric poles.
Said driving public electrode 406a, 406b, 406c, 406d and said induction public electrode 407a, 407b, 407c, 407d are positioned at same one deck.
Said colored filter substrate also comprises driving connecting line 409 and induction connecting line 410; Wherein, Drive connecting line 409 and be used for said a plurality of driving public electrode 406a, 406b, 406c, 406d are connected in common electric voltage output terminal (figure does not show), induction connecting line 410 is used for said a plurality of induction public electrode 407a, 407b, 407c, 407d are connected in common electric voltage output terminal (figure does not show).
Need to prove; In the above-described embodiments, be example with the single-layer touch electrode, but the present invention is not restricted to this; The embodiment of the invention can also be the multilayer touch electrode, and those skilled in the art can make distortion, substitute and revise the present invention according to the foregoing description.
Also need to prove; In the above-described embodiments, be example with the strip shaped electric poles, but the present invention is not restricted to this; The embodiment of the invention can also be " V " shape electrode, and those skilled in the art can make distortion, substitute and revise the present invention according to the foregoing description.
To sum up; The present invention provides a kind of touch LCD display and a kind of colored filter substrate that is applied in the said touch LCD display; Wherein, Touch LCD display and colored filter substrate comprise independently drive mutually public electrode with the induction public electrode; Said driving public electrode links to each other with the common electric voltage output terminal with the induction public electrode, and respectively with drive driving stray capacitance that public electrode forms, form the induction stray capacitance with induction electrode, greatly reduce and drive public electrode to common electric voltage output terminal loop and respond to shared public electrode resistance and public electrode inductance between public electrode to the common electric voltage output terminal loop; Thereby can not form bigger basal signal, and then can avoid detecting the problem of failure at the testing circuit place.
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 (20)
1. touch LCD display, it comprises common electrode layer and touch electrode, and said touch electrode comprises drive electrode and induction electrode, it is characterized in that, and said common electrode layer comprises driving public electrode disconnected from each other and induction public electrode; Said driving public electrode is corresponding with drive electrode, forms to drive stray capacitance; Said induction public electrode is corresponding with induction electrode, forms the induction stray capacitance; Said driving public electrode is connected in the common electric voltage output terminal with the induction public electrode.
2. touch LCD display as claimed in claim 1; It is characterized in that; Said touch LCD display also comprises a substrate; Said touch electrode and said common electrode layer are set in turn in said substrate, and said driving public electrode and said drive electrode are over against setting, and said induction public electrode and said induction electrode are over against setting.
3. touch LCD display as claimed in claim 2; It is characterized in that; Said induction electrode and drive electrode are positioned at same one deck, and said induction electrode comprises a plurality of strip shaped electric poles, and said drive electrode is arranged between the induction electrode; Said induction public electrode comprises a plurality of strip shaped electric poles, and said driving public electrode comprises a plurality of strip shaped electric poles that are arranged between the said induction public electrode.
4. touch LCD display as claimed in claim 3 is characterized in that, said driving public electrode and said induction public electrode are positioned at same one deck.
5. like each described touch LCD display in the claim 1 to 4; It is characterized in that; Said touch LCD display also comprises driving connecting line and induction connecting line; Said driving public electrode is connected in the common electric voltage output terminal through driving connecting line, and said induction public electrode is connected in the common electric voltage output terminal through the induction connecting line.
6. touch LCD display as claimed in claim 5; It is characterized in that; Said touch LCD display also comprises a flexible printed circuit board, and said flexible printed circuit board comprises common electric voltage generating module, first connecting line and second connecting line, wherein; Said common electric voltage generating module is used to produce common electric voltage; Said common electric voltage output terminal is arranged at the common electric voltage generating module, and said first connecting line is used to connect the common electric voltage output terminal and drives connecting line, and said second connecting line is used to connect common electric voltage output terminal and induction connecting line.
7. touch LCD display as claimed in claim 6 is characterized in that, said flexible printed circuit board also comprises a touch electrode module, and said touch electrode module is used for to touch electrode output drive signal and detection signal.
8. touch LCD display as claimed in claim 7; It is characterized in that; Said common electric voltage generating module and said touch electrode module are integrated in the same chip; Said chip comprises the first common electric voltage output terminal and the second common electric voltage output terminal; The said first common electric voltage output terminal and the second common electric voltage output terminal are connected the common electric voltage output terminal of said common electric voltage generating module respectively, and wherein the first common electric voltage output terminal is connected in first connecting line, and the second common electric voltage output terminal is connected in second connecting line.
9. touch LCD display as claimed in claim 1 is characterized in that, said common electric voltage output terminal is a direct current common electric voltage output terminal.
10. touch LCD display as claimed in claim 9 is characterized in that, said dc voltage output end is an earth terminal.
11. touch LCD display as claimed in claim 10 is characterized in that, said touch LCD display also comprises a flexible printed circuit board, and said flexible printed circuit board comprises deposited copper, and said earth terminal is the deposited copper of said flexible printed circuit board.
12. touch LCD display as claimed in claim 1 is characterized in that, said common electric voltage output terminal is an interchange common electric voltage output terminal.
13. touch LCD display as claimed in claim 1 is characterized in that, said touch LCD display is a mutual capacitance type touch LCD display.
14. colored filter substrate that is used for the touch LCD display; Said colored filter substrate comprises common electrode layer and touch electrode; Said touch electrode comprises drive electrode and induction electrode; It is characterized in that said colored filter substrate comprises common electrode layer, said common electrode layer comprises driving public electrode disconnected from each other and induction public electrode; Said driving public electrode is corresponding with drive electrode, and said induction public electrode is corresponding with induction electrode.
15. like the said colored filter substrate that is used for the touch LCD display of claim 14; It is characterized in that; Said colored filter substrate also comprises a glass substrate; Said touch electrode and said common electrode layer are set in turn in said glass substrate, and said driving public electrode and said drive electrode are over against setting, and said induction public electrode and said induction electrode are over against setting.
16. like the said colored filter substrate that is used for the touch LCD display of claim 15; It is characterized in that said induction electrode and drive electrode are positioned at same one deck; Said induction electrode comprises a plurality of strip shaped electric poles; Said drive electrode is arranged between the induction electrode, and said induction public electrode comprises a plurality of strip shaped electric poles, and said driving public electrode comprises a plurality of strip shaped electric poles that are arranged between the said induction public electrode.
17., it is characterized in that said driving public electrode and said induction public electrode are positioned at same one deck like the said colored filter substrate that is used for the touch LCD display of claim 16.
18. like each described colored filter substrate that is used for the touch LCD display in the claim 14 to 17; It is characterized in that; Said colored filter substrate also comprises driving connecting line and induction connecting line; Said driving public electrode is connected in the common electric voltage output terminal through said driving connecting line, and said induction public electrode is connected in the common electric voltage output terminal through said induction connecting line.
19., it is characterized in that said colored filter substrate also comprises the insulating medium layer between touch electrode and common electrode layer like the said colored filter substrate that is used for the touch LCD display of claim 14.
20., it is characterized in that said insulating medium layer comprises colored filter like the said colored filter substrate that is used for the touch LCD display of claim 19.
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| CN201010234753.0A CN102338945B (en) | 2010-07-19 | 2010-07-19 | Touch liquid crystal display and color filter substrate |
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| CN201010234753.0A CN102338945B (en) | 2010-07-19 | 2010-07-19 | Touch liquid crystal display and color filter substrate |
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