CN102109690B - Embedded touch-screen LCD (liquid crystal display) device and control method - Google Patents
Embedded touch-screen LCD (liquid crystal display) device and control method Download PDFInfo
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Abstract
The invention provides an embedded touch-screen LCD device and a control method. The embedded touch-screen LCD device comprises an upper baseplate, a common electrode layer arranged on the upper baseplate, a lower baseplate, a pixel electrode layer on the lower baseplate, and liquid crystal layers between the common electrode layer and the pixel electrode layer, wherein the common electrode layer comprises a drive electrode and an induction electrode arranged opposite to the drive electrode; the pixel electrode layer comprises pixel electrodes and a touch-control electrode arranged between the pixel electrodes; and the touch-control electrode has mutually directly-facing part with both the drive electrode and the induction electrode. The embedded touch-screen LCD device has strong touch-control signal when being about to be touched and controlled, so that the signal-to-noise ratio is improved, and the performance of the touch screen is improved.
Description
Technical field
The present invention relates to technical field of liquid crystal display, particularly embedded touch-screen liquid crystal indicator and control method.
Background technology
In touch screen technology, with respect to resistive touch screen, capacitive touch screen have the life-span long, transmittance is high, can support advantages such as multiple point touching.And, capacitive touch screen to noise and over the ground stray capacitance the good restraining effect is also arranged.Therefore, capacitive touch screen has become one of focus of touch-screen manufacturing nowadays.
With reference to shown in Figure 1, a kind of capacitive touch screen of prior art comprises: the drive electrode layer 1 on glass substrate 9, the glass substrate 9, the dielectric layer 10 on the drive electrode layer 1, the induction electrode layer 2 on the dielectric layer 10 and the protective seam 11 on the induction electrode layer 2.
With reference to shown in Figure 2, in the above-mentioned capacitive touch screen, drive electrode layer 1 comprises many driven in parallel line 5a; 5b...5h; Induction electrode layer 2 comprises many parallel line of induction 6a, 6b...6h, and the said drive wire and the line of induction are generally the electrode wires that is made up of the brilliant electrode pattern.And the said drive wire and the line of induction are orthogonal.
Continue with reference to shown in Figure 2, during work, to said many drive wire 5a, 5b...5h applies successively and drives alternating voltage 3, and all the other drive wires link to each other with ground wire 4 simultaneously.And said many line of induction 6a of gating switch 7 controls, the connection status of 6b...6h and testing circuit 8.Said testing circuit 8 detects touching signals through the connected line of induction.
Below the process simple example that detects touching signals (scanning) is explained that for example at first drive wire 5a is applied driving voltage 3, other drive wire 5b, 5c...5h then link to each other with ground wire 4.At this moment, gating switch 7 control line of induction 6a link to each other with testing circuit 8, and that then testing circuit 8 detects is drive wire 5a and line of induction 6a.Have only the intersection point place of finger touch, just have touching signals at these two lines.Then, gating switch 7 is controlled 6b more successively, and 6c...6h links to each other with testing circuit 8, and then testing circuit 8 detects drive wire 5a successively with line of induction 6b, the touching signals at 6c...6h intersection point place.This process applies driving voltage 3 to drive wire 5b after finishing, and other drive wires 5a, 5c...5h then link to each other with ground wire 4.At this moment, gating switch 7 is controlled 6a more successively, and 6b...6h links to each other with testing circuit 8, and 8 of testing circuits detect drive wire 5b successively with line of induction 6a, the touching signals at 6b...6h intersection point place.By that analogy, successively all the other drive wire 5c...5h are accomplished the process of above-mentioned detection touching signals (scanning), so just accomplished scanning the intersection point place of all drive wires and all lines of induction.
In the above-mentioned scanning process, the equivalent electrical circuit that the intersection point place of each the bar drive wire and the line of induction faces when touching is as shown in Figure 3.With reference to shown in Figure 3, drive wire 5a, 5c...5h and line of induction 6a, the mutual capacitance C1 that all has been coupled of each intersection point place of 6b... 6h.Drive wire 5a, 5c...5h and line of induction 6a, 6b...6h have stray capacitance C2, C3 over the ground separately respectively, and drive wire 5a, and 5c...5h and line of induction 6a, 6b...6h also have line resistance R1, R2 separately.And testing circuit 8 is current amplifiers, and it transforms into voltage signal Vout output with the electric current I sense on the line of induction that is connected, to realize the detection of touching signals.
To point equivalence is a resistance, capacitance network 16, and said resistance, capacitance network comprise resistance R 3, R4, R5 and capacitor C 4, C5, C6.Wherein, resistance R 5 is serially connected with ground via capacitor C 6, and resistance R 3, capacitor C 4 and resistance R 4, capacitor C 5 are connected in series respectively, and the end of capacitor C 4, C5 is as the contact-making switch of finger with touch-screen.When the said touch-screen of finger touch; Said contact-making switch connects the drive wire and the line of induction respectively, and then capacitor C 1 and capacitor C 4, C5 are parallelly connected, and this moment, variation took place the mutual capacitance value at said intersection point place; So just cause induction current Isense to change, thereby output voltage V out is changed.The variation of said output voltage V out can be used as and touches other corresponding functional unit identification of instruction and execution.
The part-structure of the another kind of single-layer touch screen of prior art is as shown in Figure 4.In conjunction with Fig. 1 and shown in Figure 4, with respect to touch-screen shown in Figure 1, every drive wire 17a of said single-layer touch screen, 17b, 17c, 17d, 17e separates in touching the perform region, and keeps connecting in outer peripheral areas.Said drive wire 17a, 17b, 17c, 17d, 17e still with line of induction 18a, 18b, 18c, 18d has formed matrix structure.The intersection point place of every the drive wire and the line of induction has mutual capacitance C8.The principle of work of said single-layer touch screen is identical with touch-screen shown in Figure 1, can combine Fig. 3 to carry out reference.
Slightly different with above-mentioned two kinds of touch-screens, prior art has a kind of pressure type touch screen structure in addition.With reference to shown in Figure 5, said pressure type touch-screen comprises the liquid crystal layer 22 between upper substrate 20, infrabasal plate 21 and upper and lower base plate.The columnar protrusions 23 that has conduction on the said upper substrate 20,21 formation of this columnar protrusions 23 and infrabasal plate are pushed preceding capacitor C 9.After finger 26 was pushed upper substrate 20, upper substrate 20 distortion made columnar protrusions 23 more near infrabasal plate 21.At this moment, back capacitor C 10 is pushed in 21 formation of columnar protrusions 23 and infrabasal plate.Because it is more approaching with infrabasal plate 21 to push back columnar protrusions 23, therefore pushing back capacitor C 10 can be greater than capacitor C 9 before pushing.Then, also can produce corresponding touching signals based on the capacitance variation before and after pushing.
Yet; No matter be Fig. 1, capacitive sensing structure shown in Figure 4 or pressure type structure shown in Figure 5, when being applied to embedded touch-screen, all have the strong inadequately problem of touching signals; When noise ratio was serious, the performance of said touch-screen will receive and seriously influencing.
Summary of the invention
The present invention solves the strong inadequately problem of touching signals of prior art touch screen structure.
For addressing the above problem; The present invention provides a kind of embedded touch-screen liquid crystal indicator; Comprise: the pixel electrode layer on the common electrode layer on upper substrate, the upper substrate, infrabasal plate, the infrabasal plate; And the liquid crystal layer of common electrode layer and pixel electrode interlayer; Said common electrode layer comprises the induction electrode that drive electrode and relative drive electrode are provided with, and said pixel electrode layer comprises the touch-control electrode between pixel electrode and pixel electrode, and said touch-control electrode and said drive electrode, induction electrode have each other over against part.
The present invention also provides a kind of control method of embedded touch-screen liquid crystal indicator; Said embedded touch-screen liquid crystal indicator further comprises the thin film transistor (TFT) of controlling pixel electrode; Said control method comprises: under control mode touch mode; Close all thin film transistor (TFT)s in the tft layer, under display mode, open the thin film transistor (TFT) in the tft layer line by line.
Compared with prior art, above-mentioned embedded touch-screen liquid crystal indicator has the following advantages: constitute the electric capacity relational structure through drive electrode, induction electrode, touch-control electrode.When said embedded touch-screen liquid crystal indicator is touched; Coupling capacitance between finger and drive electrode, induction electrode has increased the mutual capacitance between drive electrode and induction electrode; And the electric capacity between touch-control electrode and said drive electrode, induction electrode is also followed and is touched and increase, thereby has further increased the mutual capacitance between drive electrode and induction electrode.Therefore, the touching signals of said embedded touch-screen liquid crystal indicator when facing touch-control is stronger, thereby has improved signal to noise ratio (S/N ratio), has improved the performance of touch-screen.
Description of drawings
Fig. 1 is the structural representation of a kind of capacitive touch screen of prior art;
Fig. 2 is the drive electrode layer of capacitive touch screen shown in Figure 1 and the annexation and the work synoptic diagram of induction electrode layer;
Fig. 3 is Fig. 1, touch-screen shown in 2 faces the schematic equivalent circuit when touching;
Fig. 4 is the part-structure synoptic diagram of the another kind of individual layer capacitive touch screen of prior art;
Fig. 5 is the structural representation of a kind of pressure type touch-screen of prior art;
Fig. 6 is first kind of example structure synoptic diagram of the embedded touch-screen liquid crystal indicator of the present invention;
Fig. 7 is second kind of example structure synoptic diagram of the embedded touch-screen liquid crystal indicator of the present invention;
Fig. 8 is that embedded touch-screen liquid crystal indicator shown in Figure 7 faces the electric capacity relational structure situation of change synoptic diagram when touching;
Fig. 9 is the principle of work synoptic diagram of Fig. 6 or embedded touch-screen liquid crystal indicator shown in Figure 7;
Figure 10 is display mode, the signal schematic representation when control mode touch mode is worked of Fig. 6 or embedded touch-screen liquid crystal indicator shown in Figure 7.
Embodiment
Based on the strong inadequately defective of the touching signals of prior art touch screen structure, the embedded touch-screen liquid crystal indicator of the present invention increases the capacitance variations when being touched, the touching signals that produces when facing touch-control with enhancing through the electric capacity relational structure is set.
Various embodiment to the embedded touch-screen liquid crystal indicator of the present invention are elaborated below in conjunction with accompanying drawing.
With reference to shown in Figure 6, first kind of embodiment of the embedded touch-screen liquid crystal indicator of the present invention comprises:
And, the liquid crystal layer 30 of common electrode layer and pixel electrode interlayer.
Wherein, said common electrode layer comprises the induction electrode 36 that drive electrode 35 and relative drive electrode 35 are provided with.Said pixel electrode layer comprises the touch-control electrode 44 between pixel electrode 43 and pixel electrode; Said touch-control electrode 44 and said drive electrode 35, induction electrode 36 have each other over against part, and said pixel electrode 43 also has each other over against part with said drive electrode 35, induction electrode 36.
The embedded touch-screen liquid crystal indicator of present embodiment is through being oppositely arranged drive electrode 35 and induction electrode 36; Form mutual capacitance betwixt; And have each other over against part through touch-control electrode 44 and said drive electrode 35, induction electrode 36 are set, make also each self-forming electric capacity of 36 of touch-control electrode 44 and said drive electrode 35, induction electrodes.Thereby, not only comprised mutual capacitance between the two with drive electrode 35 and induction electrode 36 relevant capacitance structures, also comprise the electric capacity of 44 at both and touch-control electrode.Then, when facing touch, this three partition capacitance all can change, thereby increases the capacitance variations when being touched.
In the embedded touch-screen liquid crystal indicator of present embodiment, the material of upper substrate 27, infrabasal plate 33 can be glass.The material of drive electrode 35, induction electrode 36, pixel electrode 43 and touch-control electrode 44 can be transparent conductive oxide, for example tin indium oxide (ITO) or indium zinc oxide (IZO).The shape of drive electrode 35 can be with the drive wire 17a among Fig. 4,17b, and 17c, 17d, 17e is identical, and the shape of induction electrode 36 can be with the line of induction 18a among Fig. 4,18b, 18c, 18d is identical.
With reference to shown in Figure 7, second kind of embodiment of the embedded touch-screen liquid crystal indicator of the present invention comprises:
And, the liquid crystal layer 30 of common electrode layer and pixel electrode interlayer.
Wherein, said common electrode layer comprises the induction electrode 36 that drive electrode 35 and relative drive electrode 35 are provided with, and is connected with first conductive prominence 40 on the said drive electrode 35, is connected with second conductive prominence 45 on the said induction electrode 36.Said pixel electrode layer comprises the touch-control electrode 44 between pixel electrode 43 and pixel electrode.Said first conductive prominence 40, second conductive prominence 45 are provided with over against said touch-control electrode 44.Said pixel electrode 43 and said drive electrode 35, induction electrode 36 also have each other over against part.
Similar with the embedded touch-screen liquid crystal indicator of first kind of embodiment; The embedded touch-screen liquid crystal indicator of present embodiment is through being oppositely arranged drive electrode 35 and induction electrode 36; Form mutual capacitance betwixt; And have each other over against part through touch-control electrode 44 and said first conductive prominence 40, second conductive prominence 45 are set, make also each self-forming electric capacity of 45 of touch-control electrode 44 and said first conductive prominence 40, second conductive prominences.Because first conductive prominence 40, second conductive prominence 45 are connected with drive electrode 35, induction electrode 36 separately; Thereby not only comprised mutual capacitance between the two with drive electrode 35 and induction electrode 36 relevant capacitance structures, also comprised the electric capacity of 44 at first conductive prominence 40, second conductive prominence 45 and touch-control electrode.Then, when facing touch, this three partition capacitance all can change, thereby increases the capacitance variations when being touched.And; Consider that embedded touch-screen liquid crystal indicator faces the deformation situation of the upper substrate 27 when touching; Embedded touch-screen liquid crystal indicator with respect to first kind of embodiment; The embedded touch-screen liquid crystal indicator of present embodiment is facing when touching, and the capacitance variations that first conductive prominence 40, second conductive prominence 45 and touch-control electrode are 44 should be more remarkable than the capacitance variations of 44 at said drive electrode 35, induction electrode 36 and touch-control electrode, thereby more help strengthening touching signals.
In the embedded touch-screen liquid crystal indicator of present embodiment, the material of upper substrate 27, infrabasal plate 33 can be glass.The material of drive electrode 35, induction electrode 36, pixel electrode 43, touch-control electrode 44 can be transparent conductive oxide, for example tin indium oxide (ITO) or indium zinc oxide (IZO).Said first conductive prominence 40, second conductive prominence 45 are coated with the transparent convexity of transparent conductive oxide for outside surface.The shape of drive electrode 35 can be with the drive wire 17a among Fig. 4,17b, and 17c, 17d, 17e is identical, and the shape of induction electrode 36 can be with the line of induction 18a among Fig. 4,18b, 18c, 18d is identical.
Below be example with the embedded touch-screen liquid crystal indicator of second kind of embodiment, its electric capacity relational structure situation of change that faces when touching is further specified.
With reference to shown in Figure 8, drive electrode 35,36 of induction electrodes have mutual capacitance C11.First conductive prominence 40 and touch-control electrode 44 ask to have capacitor C 14, the second conductive prominences 45 and 44 at touch-control electrode has capacitor C 15.Said three partition capacitances constitute the electric capacity relational structure relevant with drive electrode 35, induction electrode 36.When finger 34 touched upper substrates 27,36 of finger 34 and drive electrode 35, induction electrodes were with each self-forming coupling capacitance C12, C13.In conjunction with reference to figure 3, can be resistance, capacitance network 16 among Fig. 3 still with finger 34 equivalences.At this moment, finger 34 is connected in parallel coupling capacitance C12, C13 and mutual capacitance C11 as a bridge, thus the increase of the capacitance of whole capacitor relational structure.And when finger touch upper substrate 27, deformation (Fig. 8 is not shown) also can take place in upper substrate 27, and the conductive prominence 40 of winning, second conductive prominence 45 are reduced with the spacing of touch-control electrode 44, and correspondingly, the capacitance of capacitor C 14, C15 increases.Thereby the capacitance of whole capacitor relational structure further increases.Can push away, if induction electrode 36 is connected with the testing circuit 8 of Fig. 3, then also can to compare several kinds of touch screen structures of prior art stronger for testing circuit 8 measured touching signals.Therefore, along with the enhancing of touching signals, the also corresponding raising of signal to noise ratio (S/N ratio) helps improving the performance of embedded touch-screen liquid crystal indicator, also is more suitable for being applied to embedded touch-screen.
Explanation according to above-mentioned two kinds of embedded touch-screen liquid crystal indicators of embodiment can learn that the embedded touch-screen liquid crystal indicator of these two kinds of embodiment all can be realized the integrated of touch controllable function and Presentation Function.Said drive electrode 35 and induction electrode 36 are in control mode touch mode following time at embedded touch-screen liquid crystal indicator, bear the function of transmitting touching signals, and are in display mode following time at embedded touch-screen liquid crystal indicator, bear the function of public electrode.
Below the corresponding control procedure of said control mode touch mode and display mode is further specified.
Fig. 9 is the principle of work synoptic diagram of above-mentioned two kinds of embedded touch-screen liquid crystal indicators of embodiment, and the local LCD array that the course of work of said embedded touch-screen liquid crystal indicator can be shown in Figure 9 describes.With reference to shown in Figure 9, said LCD array comprises: the multi-strip scanning line 48 of intersection and data line 53, said sweep trace 48 are by scan line drive circuit 47 controls, and said data line 53 is by data line drive circuit 46 controls.Said sweep trace 48 defines a plurality of pixel cells with data line 53.Each pixel cell comprises thin film transistor (TFT) 49, liquid crystal display pixel (can equivalently be liquid crystal capacitance Clc) and MM CAP Cs; Wherein, The grid of thin film transistor (TFT) 49 links to each other with sweep trace 48, source electrode links to each other with data line 53; Drain electrode links to each other with liquid crystal capacitance Clc, MM CAP Cs, and said liquid crystal capacitance Clc, MM CAP Cs's is public electrode 51 to ground electrode.
In conjunction with Fig. 6 and Fig. 9 or Fig. 7 and shown in Figure 9; Sweep trace 48, data line 53, thin film transistor (TFT) 49 and MM CAP Cs have constituted tft layer 32 jointly; Drive electrode 35, induction electrode 36 are in display mode following time at embedded touch-screen liquid crystal indicator and bear the function of public electrode 51, and drive electrode 35, induction electrode 36 then constitute liquid crystal capacitance Clc (two-plate of liquid crystal capacitance Clc is respectively drive electrode 35/ induction electrode 36 and a pixel electrode 43) with pixel electrode 43.At work, sweep trace 48 is lined by line scan successively, by the electric potential difference of the signal on signal that transfers to pixel electrode 43 through data line 53 and drive electrode 35/ induction electrode 36, determines the display gray scale of liquid crystal display pixel in each pixel cell.
And, just need separate touch controllable function and Presentation Function through the signal on the gated sweep line 48 for touch controllable function and the Presentation Function that guarantees embedded touch-screen liquid crystal indicator is independent of each other.
Specifically: when embedded touch-screen liquid crystal indicator is operated in display mode following time, on drive electrode 35 and induction electrode 36 (public electrode 51), apply common electric voltage Vcom, on sweep trace 48, apply scanning voltage V line by line by scan line drive circuit 47
1... V
N-1, V
n, on data line 53, apply data line voltage by data line drive circuit 46.At this moment, thin film transistor (TFT) 49 follows scanning voltage to open line by line, and control data line driven liquid crystal display pixel normally shows.
And when embedded touch-screen liquid crystal indicator subsequent working during at control mode touch mode, by scan line drive circuit 47 all sweep traces 48 of control all thin film transistor (TFT)s 49 cut out.For example,, can on all sweep traces 48, apply negative voltage for the situation of thin film transistor (TFT) 49 for the NMOS pipe, for example-10V, at this moment, the grid voltage of NMOS pipe is a negative voltage, is in closed condition.Because all thin film transistor (TFT)s 49 all are in closed condition, therefore at this moment the voltage at liquid crystal pixel two ends just can not change with the variation of drive electrode 35 and induction electrode 36 (public electrode 51) voltage.That is to say that the voltage that changes drive electrode 35 and induction electrode 36 (public electrode 51) just can not have influence on normal display quality.Therefore, at this moment drive electrode 35 and induction electrode 36 just can be realized touch controllable function.
When embedded touch-screen liquid crystal indicator is operated in display mode following time once more, scan line drive circuit 47 begins on sweep trace 48, to apply line by line the scanning voltage of opening thin film transistor (TFT) 49 again, for example the scanning voltage V of the corresponding first row thin film transistor (TFT) 49 among Figure 10
1
Therefore; Just can carry out time-sharing multiplex through above-mentioned control to drive electrode 35 and induction electrode 36 to sweep trace; Make drive electrode 35 and induction electrode 36 can be simultaneously as the public electrode 51 of liquid crystal display, and drive electrode, induction electrode during touch-control.
Though the present invention discloses as above with preferred embodiment, the present invention is defined in this.Any those skilled in the art are not breaking away from the spirit and scope of the present invention, all can do various changes and modification, so protection scope of the present invention should be as the criterion with claim institute restricted portion.
Claims (11)
1. embedded touch-screen liquid crystal indicator; Comprise: the pixel electrode layer on the common electrode layer on upper substrate, the upper substrate, infrabasal plate, the infrabasal plate, the tft layer between infrabasal plate and pixel electrode layer; And the liquid crystal layer of common electrode layer and pixel electrode interlayer; It is characterized in that; Said common electrode layer comprises the induction electrode that drive electrode and relative drive electrode are provided with; Said pixel electrode layer comprises the touch-control electrode between pixel electrode and pixel electrode, and said touch-control electrode and said drive electrode, induction electrode have each other over against part, and said tft layer is made up of sweep trace, data line, thin film transistor (TFT) and MM CAP;
Under display mode; On said drive electrode and said induction electrode, apply common electric voltage; Said drive electrode and said induction electrode are born the function of public electrode, on sweep trace, apply scanning voltage line by line by scan line drive circuit, on data line, apply data line voltage by data line drive circuit; Make thin film transistor (TFT) follow scanning voltage to open line by line, control data line driven liquid crystal display pixel normally shows;
Under control mode touch mode; Control said sweep trace by scan line drive circuit all thin film transistor (TFT)s cut out, each self-forming electric capacity between said drive electrode and the induction electrode, between said drive electrode and the said touch-control electrode, between said induction electrode and the said touch-control electrode.
2. embedded touch-screen liquid crystal indicator as claimed in claim 1 is characterized in that, is connected with conductive prominence on said drive electrode and the induction electrode, and said conductive prominence is provided with over against the touch-control electrode.
3. embedded touch-screen liquid crystal indicator as claimed in claim 1 is characterized in that the material of said drive electrode and induction electrode is a transparent conductive oxide.
4. embedded touch-screen liquid crystal indicator as claimed in claim 2 is characterized in that, said conductive prominence is the transparent convexity that outside surface is coated with transparent conductive oxide.
5. embedded touch-screen liquid crystal indicator as claimed in claim 1 is characterized in that the material of said pixel electrode and touch-control electrode is a transparent conductive oxide.
6. embedded touch-screen liquid crystal indicator as claimed in claim 1 is characterized in that said pixel electrode and said drive electrode and/or induction electrode also have each other over against part.
7. like each described embedded touch-screen liquid crystal indicator of claim 3 to 5, it is characterized in that said transparent conductive oxide is tin indium oxide or indium zinc oxide.
8. embedded touch-screen liquid crystal indicator as claimed in claim 1 is characterized in that said upper substrate and public electrode interlayer also comprise colored filter.
9. embedded touch-screen liquid crystal indicator as claimed in claim 1 is characterized in that the material of said upper substrate, infrabasal plate is a glass.
10. control method like claim 1 to 6,8 to 9 each described embedded touch-screen liquid crystal indicators; Said embedded touch-screen liquid crystal indicator further comprises the thin film transistor (TFT) of controlling pixel electrode; Said control method comprises: under control mode touch mode; Close all thin film transistor (TFT)s in the tft layer, under display mode, open the thin film transistor (TFT) in the tft layer line by line.
11. the control method of embedded touch-screen liquid crystal indicator as claimed in claim 10 wherein, when thin film transistor (TFT) is the NMOS pipe, is closed thin film transistor (TFT) and is comprised that the grid to the NMOS pipe applies negative voltage.
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