CN104978939A - Liquid crystal display device and common voltage compensation method thereof - Google Patents
Liquid crystal display device and common voltage compensation method thereof Download PDFInfo
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Abstract
The embodiment of the invention discloses a liquid crystal display device and a common voltage compensation method thereof, and belongs to the technical field of display. The common voltage compensation method comprises the steps that m transverse lines and n vertical lines are simulated in the display area of a liquid crystal display panel; common voltage of the m transverse lines is simulated, and gate and source electrode parasitic capacitance of the corresponding m transverse lines is obtained according to the simulated common voltage of the corresponding m transverse lines; the compensation capacitance value of the corresponding m transverse lines is obtained according to the calculated gate and source electrode parasitic capacitance of the corresponding m transverse lines; the common voltage of the corresponding m transverse lines is calculated again; and whether the difference value between the common voltage of the adjacent transverse lines is less than a standard value is judged, and the gate and source electrode parasitic capacitance of the liquid crystal display device is compensated according to the compensation capacitance value of the corresponding m transverse lines if the judgment result is yes so that the common voltage along the direction of the m transverse lines is enabled to be uniform in distribution. The common voltage along the direction of the m transverse lines is enabled to be uniform in distribution so that frame display quality is enhanced.
Description
Technical field
The present invention relates to display technique field, particularly a kind of liquid crystal indicator and common electric voltage compensation method thereof.
Background technology
Liquid crystal indicator (Liquid Crystal Display, LCD) have that image quality is good, volume is little, lightweight, low driving voltage, low-power consumption, the advantage that radiationless and manufacturing cost is relatively low, occupy an leading position in flat display field at present, liquid crystal indicator is applicable to being applied in desk-top computer, palmtop computer, personal digital assistant (Personal Digital Assignment, PDA), portable phone, TV and multiple office automation and audio-visual equipment very much.
Display panels is the important component part of liquid crystal indicator, Figure 1A is the partial structurtes schematic diagram of existing display panels, as shown in Figure 1A, in display panels 5, the picture display of viewing area needs the driving of gated sweep signal and data-signal, and gated sweep signal is from the gate drivers 10 outside viewing area, data-signal is from the source electrode driver 11 outside viewing area.Gate drivers 10 is connected by grid connecting line 15 with the gate line 13 of viewing area, is connected between source electrode driver 11 and the data line 17 of viewing area by data connecting line 19.The layout of grid connecting line 15 or data connecting line 19 generally takes splayed to arrange, and the length of these connecting lines be there are differences.Wherein, be positioned at middle connecting line the shortest, the length being positioned at the connecting line of both sides is the longest.Thus the resistance sizes of these connecting lines also there are differences.Each bar gate line 13 and data line 17 also can also exist a large amount of electric capacity with the interlayer of display panels simultaneously.The difference of conductor resistance and the existence of layer capacitance of the difference of the conductor resistance of each bar gate line and grid connecting line, pieces of data line and data connecting line can produce RC delays effect (RC delay Effect).Especially, differing greatly of the RC delays effect that each bar gate line and grid connecting line produce, and then cause current potential (common electric voltage) skewness of the public electrode along gate line and data line direction, the common electric voltage along each bar gate line and data line direction is made to raise or reduce, such as, as shown in Figure 1B, display panels is along the common electric voltage skewness of gate line direction of routing, a-l curve represents the common electric voltage distribution curve along gate line direction respectively, in Figure 1B, namely be along gate line direction from left to right, as can be seen from Figure 1B, common electric voltage presents ascendant trend from left to right.As shown in Figure 1 C, a-l curve represents the common electric voltage distribution curve along data line direction respectively, due to the RC delays effects of the grid connecting line of display panels, cause display panels along data line direction of routing i.e. common electric voltage skewness longitudinally.And the above-mentioned RC delays effect due to gate line or grid connecting line cause the skewness phenomenon of the common electric voltage at diverse location place will cause display panels show uneven, there is image retention, phenomenon such as display GTG exception and cross-talk etc., affect the quality of picture display, thus reduce the display effect of display panels.
Summary of the invention
The invention provides a kind of liquid crystal indicator and common electric voltage compensation method thereof, solving above-mentioned liquid crystal indicator affects the problems such as picture display quality because of the common electric voltage skewness phenomenon at diverse location place.
Described technical scheme is as follows:
Embodiments provide a kind of common electric voltage compensation method, be applicable to a display panels, display panels comprise many gate lines and with many cross one another a plurality of data lines of gate line, method, comprise: the m bar x wire parallel with gate line is simulated to the viewing area of display panels and intersects with m bar x wire and the n bar vertical line parallel with data line, and viewing area is divided into n*m region, wherein, m, n be greater than 0 integer; The common electric voltage of simulation m bar x wire, obtains the grid source electrode stray capacitance of corresponding m bar x wire according to the corresponding m bar x wire common electric voltage of simulation; According to the grid source electrode stray capacitance of the corresponding m bar x wire calculated, obtain the building-out capacitor value of corresponding m bar x wire; The common electric voltage of corresponding m bar x wire is recalculated according to the building-out capacitor value of corresponding m bar x wire; And whether difference is less than standard value between the common electric voltage judging adjacent transverse line, if, then according to the building-out capacitor value of corresponding m bar x wire, the grid source electrode stray capacitance in liquid crystal indicator is compensated, be evenly distributed to make the common electric voltage along m bar x wire direction.
In one embodiment of the invention, between the common electric voltage judging adjacent transverse line, whether difference is less than standard value, comprise: if not, then recalculate the new stray capacitance obtaining corresponding m bar x wire, and according to the new stray capacitance of corresponding m bar x wire calculated, carry out, according to the grid source electrode stray capacitance of the corresponding m bar x wire calculated, obtaining the step of the building-out capacitor value of corresponding m bar x wire.
In one embodiment of the invention, according to the grid source electrode stray capacitance Cgs of the corresponding m bar x wire calculated, obtain the building-out capacitor value of corresponding m bar x wire, comprise: the grid source electrode stray capacitance according to the corresponding m bar x wire calculated obtains stray capacitance maximal value, and the difference obtained between corresponding m bar x wire and grid source electrode stray capacitance maximal value, i.e. the building-out capacitor value of corresponding m bar x wire.
In one embodiment of the invention, conversion formula between the corresponding m bar x wire common electric voltage of simulation and the grid source electrode stray capacitance of corresponding m bar x wire is as follows: Vp=Cgs/ (Cgs+Cst+Clc) * (Vgh-Vgl), Vcom=(Vdh+Vdl)/2-Vp, wherein, Vcom is common electric voltage, Cgs is grid source electrode stray capacitance, Cst is memory capacitance, Clc is liquid crystal capacitance, Vgh, Vgl are the high value and low level value that provide to gate line respectively, and Vdh, Vdl are the high value and low level value that provide to data line respectively.
In one embodiment of the invention, also comprise: the common electric voltage of the vertical line of simulation n bar, obtains the grid source electrode stray capacitance of the vertical line of corresponding n bar according to the corresponding n bar vertical line common electric voltage of simulation; According to the grid source electrode stray capacitance of the vertical line of corresponding n bar calculated, obtain the building-out capacitor value of the vertical line of corresponding n bar; The common electric voltage of the vertical line of corresponding n bar is recalculated according to the building-out capacitor value of the vertical line of corresponding n bar; Between the common electric voltage judging adjacent vertical line, whether difference is less than standard value, if, then according to the building-out capacitor value of corresponding n bar vertical line, the grid source electrode stray capacitance in liquid crystal indicator is compensated, be evenly distributed to make the common electric voltage along the vertical line direction of n bar.
In one embodiment of the invention, between the common electric voltage judging adjacent vertical line, whether difference is less than standard value, comprise: if not, then recalculate the new stray capacitance obtaining the vertical line of corresponding n bar, and according to the new stray capacitance of the vertical line of corresponding n bar calculated, carry out, according to the grid source electrode stray capacitance of the vertical line of corresponding n bar calculated, obtaining the step of the building-out capacitor value of the vertical line of corresponding n bar.
In one embodiment of the invention, also comprise: obtain according to the building-out capacitor value of the vertical line of corresponding n bar the capacity area that the vertical line of corresponding n bar should compensate; The width of the respective gates line at the vertical line position place of corresponding n bar that should compensate is obtained according to the capacity area that should compensate and capacitance calculation formula.
In the present invention, described standard value is for being less than or equal to 200mV.N*m area size is equal.
In one embodiment of the invention, also comprise: obtain according to the building-out capacitor value of corresponding m bar x wire the capacity area that corresponding m bar x wire should compensate; The width of the respective gates line at the corresponding m bar transverse axis place that should compensate is obtained according to the capacity area that should compensate and capacitance calculation formula.
Embodiments provide a kind of liquid crystal indicator, liquid crystal indicator, comprise: display panel, panel comprises the two-dimensional array be made up of multiple pixel, and many gate lines of first direction be connected with each pel array and a plurality of data lines of second direction; Data drive circuit, for providing picture signal to data line; Gate driver circuit, for providing gated sweep drive singal to gate line; Wherein, liquid crystal indicator also adopts the grid source electrode stray capacitance of building-out capacitor value to m bar transverse axis place corresponding in liquid crystal indicator or the vertical line position place of corresponding n bar of answering of the corresponding m bar x wire of above-mentioned acquisition or the vertical line of corresponding n bar to compensate.
The beneficial effect that the technical scheme that the embodiment of the present invention provides is brought is:
By simulating m bar x wire and the vertical line of n bar to the viewing area of display panels, and simulate the common electric voltage of m bar x wire, the grid source electrode stray capacitance of corresponding m bar x wire is obtained according to the corresponding m bar x wire common electric voltage of simulation, again according to the grid source electrode stray capacitance of the corresponding m bar x wire calculated, obtain the building-out capacitor value of corresponding m bar x wire, the common electric voltage of corresponding m bar x wire is recalculated according to the building-out capacitor value of corresponding m bar x wire, between the common electric voltage judging adjacent transverse line again, whether difference is less than standard value, if, then compensate according to the grid source electrode stray capacitance of building-out capacitor value to m bar transverse axis place corresponding in liquid crystal indicator of corresponding m bar x wire, be evenly distributed to make the common electric voltage along m bar x wire direction.Because the building-out capacitor value grid source electrode stray capacitance in liquid crystal indicator corresponding m bar transverse axis place of the embodiment of the present invention by the corresponding m bar x wire obtained compensates, therefore the parasitic capacitance value after corresponding m bar x wire compensation is identical, and it is also identical with the common electric voltage value of the corresponding m bar x wire of the proportional relation of stray capacitance, therefore the common electric voltage along m bar x wire direction can be made to be evenly distributed, namely the difference of the common electric voltage of adjacent transverse line is identical, thus improves the picture display quality of display panels.
Above-mentioned explanation is only the general introduction of technical solution of the present invention, in order to technological means of the present invention can be better understood, and can be implemented according to the content of instructions, and can become apparent to allow above and other object of the present invention, feature and advantage, below especially exemplified by preferred embodiment, and coordinate accompanying drawing, be described in detail as follows.
Accompanying drawing explanation
Figure 1A is the partial structurtes schematic diagram of existing a kind of liquid crystal indicator;
Figure 1B is the common electric voltage change schematic diagram of liquid crystal indicator along gate line direction of Fig. 1;
Fig. 1 C is the common electric voltage change schematic diagram of liquid crystal indicator along data line direction of Fig. 1;
Fig. 2 A is the process flow diagram of the common electric voltage compensation method that first embodiment of the invention provides;
Fig. 2 B is schematic diagram display panels being carried out to Region dividing;
Fig. 2 C is before the compensation method without Fig. 2 A of the display panels of Fig. 2 B, transversely the common electric voltage change schematic diagram in line direction;
Fig. 2 D be the display panels of Fig. 2 B after the compensation method of Fig. 2 A, transversely line direction common electric voltage change schematic diagram;
Fig. 3 A is the process flow diagram of the common electric voltage compensation method that second embodiment of the invention provides;
Fig. 3 B is before the compensation method without Fig. 3 A of the display panels of Fig. 2 B, vertically the common electric voltage change schematic diagram in line direction;
Fig. 3 C be the display panels of Fig. 2 B after the compensation method of Fig. 3 A, vertically line direction common electric voltage change schematic diagram;
Fig. 4 A is the process flow diagram of the common electric voltage compensation method that third embodiment of the invention provides;
Fig. 4 B is before the compensation method without Fig. 4 A of the display panels of Fig. 2 B, transversely the common electric voltage change schematic diagram in line and vertical line direction;
Fig. 4 C be the display panels of Fig. 2 B after the compensation method of Fig. 4 A, transversely line and vertical line direction common electric voltage change schematic diagram.
Embodiment
For further setting forth the present invention for the technological means reaching predetermined goal of the invention and take and effect, below in conjunction with accompanying drawing and preferred embodiment, to the liquid crystal indicator proposed according to the present invention and its embodiment of common electric voltage compensation method, structure, feature and effect, be described in detail as follows.
Aforementioned and other technology contents, Characteristic for the present invention, can clearly present in following cooperation describes in detail with reference to graphic preferred embodiment.By the explanation of embodiment, when can to the present invention for the technological means reaching predetermined object and take and effect be able to more deeply and concrete understanding, however institute's accompanying drawings be only to provide with reference to and the use of explanation, be not used for being limited the present invention.
First embodiment
Fig. 2 A is the process flow diagram of the common electric voltage compensation method that first embodiment of the invention provides.Described common electric voltage compensation method is applicable to a display panels, described display panels comprise many gate lines and with many cross one another a plurality of data lines of gate line, please refer to Fig. 2 A, the common electric voltage compensation method of the present embodiment, comprises the following steps 200-209.
Step 200, the x wire parallel with gate line to the viewing area of display panels simulation m bar and intersecting with m bar x wire and the n bar vertical line parallel with data line, and viewing area is divided into n*m region, wherein, m, n be greater than 0 integer.
As shown in Figure 2 B, suppose to carry out Region dividing to the viewing area 220 of display panels, simulate the m bar x wire 221 parallel with gate line and intersect with m bar x wire 221 and the vertical line 222 of the n bar parallel with data line, and viewing area being divided into n*m equal-sized region, m bar x wire and the vertical line of n bar intersect n*m intersection point.Wherein m, n be greater than 0 integer, the concrete value of m, n is determined by concrete condition, concrete display panels.M=12 is got in the present embodiment, n=12 is that example is described, then the viewing area of display panels has 144 intersection points, shown in Fig. 2 B, set up rectangular coordinate system, namely with the lower left corner of viewing area for true origin (X1, Ym), transversely coordinate system is set up in line 221 and vertical line 222 direction, then the coordinate of each intersection point is (Xn, Ym), and in Fig. 2 B for the purpose of illustrative clarity, three x wires and three vertical lines being only shown, it is also not used to limit the present invention.
Below longitudinal direction (the RC delays effects that grid connecting line causes) common electric voltage is compensated and be described.
Step 201, the common electric voltage of simulation m bar x wire, obtains the grid source electrode stray capacitance Cgs of corresponding m bar x wire according to the corresponding m bar x wire common electric voltage of simulation.
Wherein, the analogue value of the common electric voltage of m bar x wire can the common electric voltage value needed for available liquid crystal display device set.Conversion formula between the corresponding m bar x wire common electric voltage of simulation and the grid source electrode stray capacitance of corresponding m bar x wire is as follows: Vp=Cgs/ (Cgs+Cst+Clc) * (Vgh-Vgl), Vcom=(Vdh+Vdl)/2-Vp, wherein, Vcom is common electric voltage, Cgs is grid source electrode stray capacitance, Cst is memory capacitance, Clc is liquid crystal capacitance, Vgh, Vgl are the high value and low level value that provide to gate line respectively, and Vdh, Vdl are the high value and low level value that provide to data line respectively.
Step 203, according to the grid source electrode stray capacitance Cgs of the corresponding m bar x wire calculated, obtains the building-out capacitor value of corresponding m bar x wire.
In this step, the method obtaining the building-out capacitor value of corresponding m bar x wire is as follows: the grid source electrode stray capacitance Cgs according to the corresponding m bar x wire calculated obtains stray capacitance Cgs maximal value, and the difference obtained between corresponding m bar x wire and grid source electrode stray capacitance Cgs maximal value, i.e. the building-out capacitor value of corresponding m bar x wire.
Step 205, recalculates the common electric voltage of corresponding m bar x wire according to the building-out capacitor value of corresponding m bar x wire.
Wherein, the computing formula calculating the common electric voltage of corresponding m bar x wire can calculate according to the common electric voltage in step 202 and the conversion formula between grid source electrode stray capacitance Cgs.
Step 206, between the common electric voltage judging adjacent transverse line, whether difference is less than standard value, if so, then carry out step 208, if not, then carry out step 209.
The standard-required that standard value can reach needed for display panels carries out respective settings, and this standard needs determine according to the product specification of panel and size.Small size panel such as 5 ", this standard value can set very little, such as, can be 15mV, large size panel such as 80 ", then this standard can be 200mV.In addition, the analog value of the panel of high display specification then this standard value setting is then less, and the analog value not being then this standard value setting of very high panel to display specification requirement then can be comparatively large, and usually, this standard value is the arbitrary value being less than or equal to 200mv.In the present embodiment, standard value is set as 15mV.Because of the adjacent transverse line of display panels common electric voltage between difference reflect display panels and whether be evenly distributed along the common electric voltage in m bar x wire direction (namely longitudinally), between the common electric voltage of the even adjacent transverse line of display panels, difference is less than standard value, then represent that display panels is evenly distributed along the common electric voltage in m bar x wire direction (namely longitudinally), otherwise, then the common electric voltage skewness of display panels along m bar x wire direction (namely longitudinally) is represented.
Step 208, the grid source electrode stray capacitance of building-out capacitor value to m bar transverse axis place corresponding in liquid crystal indicator according to corresponding m bar x wire compensates, and is evenly distributed to make the common electric voltage along m bar x wire direction.
Because the computing formula of capacity plate antenna is as follows: C=ε * S/d, wherein, ε is the specific inductive capacity of medium between pole plate, and S is polar plate area, d be polar plate spacing from.Therefore just can calculate other parameter of electric capacity that should compensate according to the capacitive surface product value of required compensation and capacitance calculation formula, such as, can compensate the width of corresponding m bar transverse axis place respective gates line.Can draw thus, in this step, also can comprise: obtain according to the building-out capacitor value of corresponding m bar x wire the capacity area that corresponding m bar x wire should compensate; The width of the respective gates line at the corresponding m bar transverse axis place that should compensate is obtained according to the capacity area that should compensate and capacitance calculation formula.In addition, during actual compensation, the minimum area unit that should compensate can be calculated according to capacitance, then just can calculate the minimum area number of unit compensated needed for corresponding m bar x wire according to building-out capacitor value and minimum area unit.
Step 209, recalculates the new stray capacitance Cgs obtaining corresponding m bar x wire, and according to the new stray capacitance Cgs of corresponding m bar x wire calculated, carry out step 203, to obtain the new building-out capacitor value of corresponding m bar x wire.
By the building-out capacitor value of the corresponding m bar x wire of the acquisition through above step to liquid crystal indicator in the grid source electrode stray capacitance at corresponding m bar transverse axis place compensate, because the parasitic capacitance value after corresponding m bar x wire compensation is identical, can find out according to the formula in step 201, also identical with the common electric voltage value Vcom of the corresponding m bar x wire of the proportional relation of stray capacitance Cgs, therefore the common electric voltage along m bar x wire direction can be made to be evenly distributed, namely the difference of the common electric voltage of adjacent transverse line is identical, as shown in (a) figure in Fig. 2 C, the common electric voltage distribution curve a-l curve of a vertical line as can be seen from 12 in (a) figure, the common electric voltage distribution Delta Vcom compensating m bar (12) x wire direction, forward position is 78 ~ 91mV, and after the compensation method of the present embodiment, as shown in (b) figure in Fig. 2 C, the common electric voltage distribution curve a-l curve of a vertical line as can be seen from 12 in (b) figure, common electric voltage distribution Delta Vcom along m bar (12) x wire direction is less than 12mV, illustrate that the compensation method of the present embodiment can eliminate the common electric voltage phenomenon pockety along m bar x wire direction because stray capacitance causes.
In sum, the common electric voltage compensation method that the embodiment of the present invention provides, by simulating m bar x wire and the vertical line of n bar to the viewing area of display panels, and simulate the common electric voltage of m bar x wire, the grid source electrode stray capacitance of corresponding m bar x wire is obtained according to the corresponding m bar x wire common electric voltage of simulation, again according to the grid source electrode stray capacitance of the corresponding m bar x wire calculated, obtain the building-out capacitor value of corresponding m bar x wire, the common electric voltage of corresponding m bar x wire is recalculated according to the building-out capacitor value of corresponding m bar x wire, between the common electric voltage judging adjacent transverse line again, whether difference is less than standard value, if, then compensate according to the grid source electrode stray capacitance of building-out capacitor value to m bar transverse axis place corresponding in liquid crystal indicator of corresponding m bar x wire, be evenly distributed to make the common electric voltage along m bar x wire direction.Because the building-out capacitor value grid source electrode stray capacitance in liquid crystal indicator corresponding m bar transverse axis place of the embodiment of the present invention by the corresponding m bar x wire obtained compensates, therefore the parasitic capacitance value after corresponding m bar x wire compensation is identical, and can find out according to the formula in step 201, also identical with the common electric voltage value of the corresponding m bar x wire of the proportional relation of stray capacitance, therefore the common electric voltage along m bar x wire direction can be made to be evenly distributed, namely the difference of the common electric voltage of adjacent transverse line is identical, thus improves the picture display quality of display panels.
Second embodiment
Fig. 3 A is the process flow diagram of the common electric voltage compensation method that second embodiment of the invention provides.The difference of the present embodiment and Fig. 2 A is: the present embodiment compensates transverse direction (the RC delays effects that gate line causes) common electric voltage.Described common electric voltage compensation method comprises the following steps 300-309.
Step 300, the x wire parallel with gate line to the viewing area of display panels simulation m bar and intersecting with m bar x wire and the n bar vertical line parallel with data line, and viewing area is divided into n*m region, wherein, m, n be greater than 0 integer.
This step is identical with the step 200 of Fig. 2 A, does not repeat them here.
Below transverse direction (the RC delays effects that gate line causes) common electric voltage is compensated and be described.
Step 301, the common electric voltage of the vertical line of simulation n bar, obtains the grid source electrode stray capacitance Cgs of the vertical line of corresponding n bar according to the corresponding n bar vertical line common electric voltage of simulation.
Wherein, the analogue value of the common electric voltage of the vertical line of n bar can the common electric voltage value needed for available liquid crystal display device set.Conversion formula between the corresponding n bar vertical line common electric voltage of simulation and the grid source electrode stray capacitance Cgs of the vertical line of corresponding n bar is as follows: Vp=Cgs/ (Cgs+Cst+Clc) * (Vgh-Vgl), Vcom=(Vdh+Vdl)/2-Vp, wherein, Vcom is common electric voltage, Cgs is grid source electrode stray capacitance, Cst is memory capacitance, Clc is liquid crystal capacitance, Vgh, Vgl are the high value and low level value that provide to gate line respectively, and Vdh, Vdl are the high value and low level value that provide to data line respectively.
Step 303, according to the grid source electrode stray capacitance Cgs of the vertical line of corresponding n bar calculated, obtains the building-out capacitor value of the vertical line of corresponding n bar.
In this step, the method obtaining the building-out capacitor value of the vertical line of corresponding n bar is as follows: the grid source electrode stray capacitance Cgs according to the vertical line of corresponding n bar calculated obtains stray capacitance Cgs maximal value, and the difference obtained between the vertical line of corresponding n bar and grid source electrode stray capacitance Cgs maximal value, i.e. the building-out capacitor value of the vertical line of corresponding n bar.
Step 305, recalculates the common electric voltage of the vertical line of corresponding n bar according to the building-out capacitor value of the vertical line of corresponding n bar.
Wherein, the computing formula calculating the common electric voltage of the vertical line of corresponding n bar can calculate according to the common electric voltage in step 302 and the conversion formula between grid source electrode stray capacitance Cgs.
Step 306, between the common electric voltage judging adjacent vertical line, whether difference is less than standard value, if so, then carry out step 308, if not, then carry out step 309.
The established standards reference example 1 of standard value, in the present embodiment, standard value is set as 15mV.Because of the adjacent vertical line of display panels common electric voltage between difference reflect display panels and whether be evenly distributed along the common electric voltage in the vertical line direction of n bar (namely longitudinally), between the common electric voltage of the even adjacent vertical line of display panels, difference is less than standard value, then represent that display panels is evenly distributed along the common electric voltage in the vertical line direction of n bar (namely longitudinally), otherwise, then the common electric voltage skewness of display panels along the vertical line direction of n bar (namely longitudinally) is represented.
Step 308, the grid source electrode stray capacitance of building-out capacitor value to the vertical line position place of n bar corresponding in liquid crystal indicator according to the vertical line of corresponding n bar compensates, and is evenly distributed to make the common electric voltage along the vertical line direction of n bar.
Because the computing formula of capacity plate antenna is as follows: C=ε * S/d, wherein, ε is the specific inductive capacity of medium between pole plate, and S is polar plate area, d be polar plate spacing from.Therefore just can calculate other parameter of electric capacity that should compensate according to the capacitive surface product value of required compensation and capacitance calculation formula, such as, can compensate the width of corresponding n bar vertical line position place respective gates line.Can draw thus, in this step, also can comprise: obtain according to the building-out capacitor value of the vertical line of corresponding n bar the capacity area that the vertical line of corresponding n bar should compensate; The width of the respective gates line at the vertical line position place of corresponding n bar that should compensate is obtained according to the capacity area that should compensate and capacitance calculation formula.In addition, during actual compensation, the minimum area unit that should compensate can be calculated according to capacitance, then just can calculate the minimum area number of unit compensated needed for the vertical line of corresponding n bar according to building-out capacitor value and minimum area unit.
Step 309, recalculates the new stray capacitance Cgs obtaining the vertical line of corresponding n bar, and according to the new stray capacitance Cgs of the vertical line of corresponding n bar calculated, carry out step 303, to obtain the new building-out capacitor value of the vertical line of corresponding n bar.
By the building-out capacitor value of the vertical line of corresponding n bar of the acquisition through above step to liquid crystal indicator in the grid source electrode stray capacitance at the vertical line position place of corresponding n bar compensate, because the parasitic capacitance value after the compensation of corresponding n bar vertical line is identical, can find out according to the formula in step 201, also identical with the common electric voltage value Vcom of the vertical line of corresponding n bar of the proportional relation of stray capacitance Cgs, therefore the common electric voltage along the vertical line direction of n bar can be made to be evenly distributed, namely the difference of the common electric voltage of adjacent vertical line is identical, as shown in (a) figure in Fig. 3 B, the common electric voltage distribution curve a-l curve of a vertical line as can be seen from 12 in (a) figure, the common electric voltage distribution Delta Vcom compensating vertical line direction, forward position n bar (12) is 50 ~ 59mV, and after the compensation method of the present embodiment, as shown in (b) figure in Fig. 3 B, the common electric voltage distribution curve a-l curve of a vertical line as can be seen from 12 in (b) figure, common electric voltage distribution Delta Vcom along the vertical line direction of m bar (12) is less than 10mV, illustrate that the compensation method of the present embodiment can eliminate the common electric voltage phenomenon pockety along n bar vertical line direction because stray capacitance causes.
In sum, the common electric voltage compensation method that the embodiment of the present invention provides, also compensate according to the grid source electrode stray capacitance of building-out capacitor value to the vertical line position place of n bar corresponding in liquid crystal indicator of the vertical line of corresponding n bar, be evenly distributed to make the common electric voltage along the vertical line direction of n bar.Because the building-out capacitor value grid source electrode stray capacitance in liquid crystal indicator corresponding n bar vertical line position place of the embodiment of the present invention by the vertical line of corresponding n bar obtained compensates, therefore the parasitic capacitance value after the compensation of corresponding n bar vertical line is identical, and can find out according to the formula in step 201, also identical with the common electric voltage value of the vertical line of corresponding n bar of the proportional relation of stray capacitance, therefore the common electric voltage along the vertical line direction of n bar can be made to be evenly distributed, namely the difference of the common electric voltage of adjacent vertical line is identical, thus improves the picture display quality of display panels.
3rd embodiment
Fig. 4 A is the process flow diagram of the common electric voltage compensation method that third embodiment of the invention provides.The difference of the present embodiment and Fig. 2 A is: the present embodiment all compensates transverse direction (the RC delays effects that gate line causes) common electric voltage and longitudinal common electric voltage.Described common electric voltage compensation method comprises the following steps 400-409.
Step 400, the x wire parallel with gate line to the viewing area of display panels simulation m bar and intersecting with m bar x wire and the n bar vertical line parallel with data line, and viewing area is divided into n*m region, wherein, m, n be greater than 0 integer.
This step is identical with the step 200 of Fig. 2 A, does not repeat them here.
Below the compensation of transverse direction (the RC delays effects that gate line causes) common electric voltage and longitudinal common electric voltage are compensated and be described.And repeatedly verify through overtesting, carry out according to the order laterally compensated after first longitudinal compensation, compensation effect is obviously better, therefore, carry out according to the order laterally compensated after first longitudinal compensation as follows, namely step 400-409 is corresponding with the step 200-209 in Fig. 2 A, and step 431-439 is corresponding with the step 301-309 in Fig. 3 A.
Step 401, the common electric voltage of simulation m bar x wire, obtains the grid source electrode stray capacitance Cgs of corresponding m bar x wire according to the corresponding m bar x wire common electric voltage of simulation.
Step 403, according to the grid source electrode stray capacitance Cgs of the corresponding m bar x wire calculated, obtains the building-out capacitor value of corresponding m bar x wire.
Step 405, recalculates the common electric voltage of corresponding m bar x wire according to the building-out capacitor value of corresponding m bar x wire.
Step 406, between the common electric voltage judging adjacent transverse line, whether difference is less than standard value, if so, then carry out step 408, if not, then carry out step 409.
Step 408, the grid source electrode stray capacitance of building-out capacitor value to m bar transverse axis place corresponding in liquid crystal indicator according to corresponding m bar x wire compensates, and is evenly distributed to make the common electric voltage along m bar x wire direction.
Step 409, recalculates the new stray capacitance Cgs obtaining corresponding m bar x wire, and according to the new stray capacitance Cgs of corresponding m bar x wire calculated, carry out step 403, to obtain the new building-out capacitor value of corresponding m bar x wire.
Step 431, the common electric voltage of the vertical line of simulation n bar, obtains the grid source electrode stray capacitance Cgs of the vertical line of corresponding n bar according to the corresponding n bar vertical line common electric voltage of simulation.
Step 433, according to the grid source electrode stray capacitance Cgs of the vertical line of corresponding n bar calculated, obtains the building-out capacitor value of the vertical line of corresponding n bar.
Step 435, recalculates the common electric voltage of the vertical line of corresponding n bar according to the building-out capacitor value of the vertical line of corresponding n bar.
Step 436, between the common electric voltage judging adjacent vertical line, whether difference is less than standard value, if so, then carry out step 438, if not, then carry out step 439.
Step 438, the grid source electrode stray capacitance of building-out capacitor value to the vertical line position place of n bar corresponding in liquid crystal indicator according to the vertical line of corresponding n bar compensates, and is evenly distributed to make the common electric voltage along the vertical line direction of n bar.
Step 439, recalculates the new stray capacitance Cgs obtaining the vertical line of corresponding n bar, and according to the new stray capacitance Cgs of the vertical line of corresponding n bar calculated, carry out step 433, to obtain the new building-out capacitor value of the vertical line of corresponding n bar.
By the building-out capacitor value of the corresponding m bar x wire of the acquisition through above step and the vertical line of corresponding n bar respectively to liquid crystal indicator in the grid source electrode stray capacitance at corresponding m bar x wire and the vertical line position place of corresponding n bar compensate, because of corresponding m bar x wire and the vertical line of corresponding n bar compensate after parasitic capacitance value identical, can find out according to the formula in step 201, also identical with the common electric voltage value Vcom of the vertical line of corresponding n bar with the corresponding m bar x wire of the proportional relation of stray capacitance Cgs, therefore the common electric voltage along m bar x wire and the vertical line direction of n bar can be made to be evenly distributed, namely the difference of the common electric voltage of adjacent transverse line is identical, the difference of the common electric voltage of adjacent vertical line is identical, as shown in (a) figure in Fig. 4 B, as can be seen from the common electric voltage distribution curve a-l curve of optional 12 lines in (a) figure, the common electric voltage distribution Delta Vcom compensating forward position m bar x wire and the vertical line direction of n bar is 135mV, and after the compensation method of the present embodiment, as shown in (b) figure in Fig. 4 B, as can be seen from the common electric voltage distribution curve a-l curve of optional 12 lines in (b) figure, common electric voltage distribution Delta Vcom along m bar x wire and the vertical line direction of n bar is 12mV, illustrate that the compensation method of the present embodiment can eliminate the common electric voltage phenomenon pockety along m bar x wire and n bar vertical line direction because stray capacitance causes.
In sum, the common electric voltage compensation method that the embodiment of the present invention provides, the grid source electrode stray capacitance of building-out capacitor value to m bar transverse axis place corresponding in liquid crystal indicator of the corresponding m bar x wire obtained first compensates by the embodiment of the present invention, therefore the parasitic capacitance value after corresponding m bar x wire compensation is identical, and can find out according to the formula in step 201, also identical with the common electric voltage value of the corresponding m bar x wire of the proportional relation of stray capacitance, therefore the common electric voltage along m bar x wire direction can be made to be evenly distributed, namely the difference of the common electric voltage of adjacent transverse line is identical.Then the grid source electrode stray capacitance of building-out capacitor value to the vertical line position place of n bar corresponding in liquid crystal indicator of the vertical line of corresponding n bar obtained compensates by the embodiment of the present invention, therefore the parasitic capacitance value after the compensation of corresponding n bar vertical line is identical, and can find out according to the formula in step 201, also identical with the common electric voltage value of the vertical line of corresponding n bar of the proportional relation of stray capacitance, therefore the common electric voltage along the vertical line direction of n bar can be made to be evenly distributed, namely the difference of the common electric voltage of adjacent vertical line is also identical, thus improve the picture display quality of display panels.
4th embodiment
According to above embodiment, the embodiment of the invention also discloses a kind of liquid crystal indicator, comprise: panel, panel comprises the two-dimensional array be made up of multiple pixel, and a plurality of data lines of first direction be connected with each pel array and many gate lines of second direction; Data drive circuit, provides picture signal for giving described data line; Gate driver circuit, provides gated sweep drive singal for giving described gate line; The grid source electrode stray capacitance of building-out capacitor value to m article of transverse axis place corresponding in liquid crystal indicator or corresponding n article of vertical line position place of answering of corresponding m article of x wire and the corresponding n bar of vertical line obtained in the first to the 3rd embodiment is also adopted to compensate.Pel array is formed on a transparent substrate, and comprises many gate lines, data line and multiple switching transistor.Switching transistor is coupled respectively to each gate line and each data line.Data drive circuit and data line coupling, and provide data-signal to data line.Gate driver circuit and gate line coupling, and driving switch transistor.
In sum, the liquid crystal indicator that the embodiment of the present invention provides, by carrying out horizontal and vertical compensation to common electric voltage, make to be evenly distributed along m bar x wire and/or along the common electric voltage in the vertical line direction of n bar, namely the difference of the common electric voltage of adjacent transverse line is identical, and/or the difference of the common electric voltage of adjacent vertical line is identical, thus improve the picture display quality of display panels.
The above, it is only preferred embodiment of the present invention, not any type of restriction is done to the present invention, although the present invention discloses as above with preferred embodiment, but and be not used to limit the present invention, any those skilled in the art, do not departing within the scope of technical solution of the present invention, make a little change when the technology contents of above-mentioned announcement can be utilized or be modified to the Equivalent embodiments of equivalent variations, in every case be do not depart from technical solution of the present invention content, according to any simple modification that technical spirit of the present invention is done above embodiment, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.
Claims (10)
1. a common electric voltage compensation method, is applicable to a display panels, described display panels comprise many gate lines and with many cross one another a plurality of data lines of gate line, it is characterized in that, the method comprises:
The m bar x wire parallel with described gate line is simulated to the viewing area of described display panels and intersects with m bar x wire and the n bar vertical line parallel with described data line, and described viewing area is divided into n*m region, wherein, m, n be greater than 0 integer;
The common electric voltage of simulation m bar x wire, obtains the grid source electrode stray capacitance of corresponding m bar x wire according to the corresponding m bar x wire common electric voltage of simulation;
According to the grid source electrode stray capacitance of the corresponding m bar x wire calculated, obtain the building-out capacitor value of corresponding m bar x wire;
The common electric voltage of corresponding m bar x wire is recalculated according to the building-out capacitor value of corresponding m bar x wire; And
Between the common electric voltage judging adjacent transverse line, whether difference is less than standard value, if, then compensate according to the grid source electrode stray capacitance of building-out capacitor value to m bar transverse axis place corresponding in liquid crystal indicator of corresponding m bar x wire, be evenly distributed to make the common electric voltage along m bar x wire direction.
2. common electric voltage compensation method according to claim 1, it is characterized in that, between the common electric voltage judging adjacent transverse line, whether difference is less than standard value, comprise: if not, then recalculate the new stray capacitance obtaining corresponding m bar x wire, and according to the new stray capacitance of corresponding m bar x wire calculated, carry out, according to the grid source electrode stray capacitance of the corresponding m bar x wire calculated, obtaining the step of the building-out capacitor value of corresponding m bar x wire.
3. common electric voltage compensation method according to claim 1, it is characterized in that, according to the grid source electrode stray capacitance Cgs of the corresponding m bar x wire calculated, obtain the building-out capacitor value of corresponding m bar x wire, comprise: the grid source electrode stray capacitance according to the corresponding m bar x wire calculated obtains stray capacitance maximal value, and the difference obtained between corresponding m bar x wire and grid source electrode stray capacitance maximal value, i.e. the building-out capacitor value of corresponding m bar x wire.
4. common electric voltage compensation method according to claim 1, it is characterized in that, conversion formula between the corresponding m bar x wire common electric voltage of simulation and the grid source electrode stray capacitance of corresponding m bar x wire is as follows: Vp=Cgs/ (Cgs+Cst+Clc) * (Vgh-Vgl), Vcom=(Vdh+Vdl)/2-Vp, wherein, Vcom is common electric voltage, Cgs is grid source electrode stray capacitance, Cst is memory capacitance, Clc is liquid crystal capacitance, Vgh, Vgl is the high value and low level value that provide to gate line respectively, Vdh, Vdl is the high value and low level value that provide to data line respectively.
5. common electric voltage compensation method according to claim 1, is characterized in that, also comprise:
The common electric voltage of the vertical line of simulation n bar, obtains the grid source electrode stray capacitance of the vertical line of corresponding n bar according to the corresponding n bar vertical line common electric voltage of simulation;
According to the grid source electrode stray capacitance of the vertical line of corresponding n bar calculated, obtain the building-out capacitor value of the vertical line of corresponding n bar;
The common electric voltage of the vertical line of corresponding n bar is recalculated according to the building-out capacitor value of the vertical line of corresponding n bar;
Between the common electric voltage judging adjacent vertical line, whether difference is less than standard value, if, then compensate according to the grid source electrode stray capacitance of building-out capacitor value to the vertical line position place of n bar corresponding in liquid crystal indicator of the vertical line of corresponding n bar, be evenly distributed to make the common electric voltage along the vertical line direction of n bar.
6. common electric voltage compensation method according to claim 5, is characterized in that, between the common electric voltage judging adjacent vertical line, whether difference is less than standard value, comprising:
If not, then recalculate the new stray capacitance obtaining the vertical line of corresponding n bar, and according to the new stray capacitance of the vertical line of corresponding n bar calculated, carry out, according to the grid source electrode stray capacitance of the vertical line of corresponding n bar calculated, obtaining the step of the building-out capacitor value of the vertical line of corresponding n bar.
7. common electric voltage compensation method according to claim 5, is characterized in that, also comprise:
The capacity area that the vertical line of corresponding n bar should compensate is obtained according to the building-out capacitor value of the vertical line of corresponding n bar;
The width of the respective gates line at the vertical line position place of corresponding n bar that should compensate is obtained according to the capacity area that should compensate and capacitance calculation formula.
8. common electric voltage compensation method according to claim 1, is characterized in that, described standard value is for being less than or equal to 200mV, and a described n*m area size is equal.
9. common electric voltage compensation method according to claim 1, is characterized in that, also comprise:
The capacity area that corresponding m bar x wire should compensate is obtained according to the building-out capacitor value of corresponding m bar x wire;
The width of the respective gates line at the corresponding m bar transverse axis place that should compensate is obtained according to the capacity area that should compensate and capacitance calculation formula.
10. a liquid crystal indicator, is characterized in that, it comprises:
Display panel, described panel comprises the two-dimensional array be made up of multiple pixel, and many gate lines of first direction be connected with each pel array and a plurality of data lines of second direction;
Data drive circuit, provides picture signal for giving described data line;
Gate driver circuit, provides gated sweep drive singal for giving described gate line;
Wherein, described liquid crystal indicator also adopts the grid source electrode stray capacitance of building-out capacitor value to m bar transverse axis place corresponding in liquid crystal indicator or the vertical line position place of corresponding n bar of answering of corresponding m bar x wire or the vertical line of corresponding n bar obtained according to any one of claim 1,5 to compensate.
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| CN111243548A (en) * | 2020-03-23 | 2020-06-05 | 武汉华星光电技术有限公司 | Array substrate, liquid crystal display panel and public voltage adjusting method thereof |
| CN113095034A (en) * | 2020-01-09 | 2021-07-09 | 瑞昱半导体股份有限公司 | Method and circuit system for compensating voltage drop by using extra power grid |
| TWI739266B (en) * | 2020-01-06 | 2021-09-11 | 瑞昱半導體股份有限公司 | Compensation method for voltage drop using additional power mesh and circuit system thereof |
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| CN104978939B (en) | 2017-05-10 |
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Address after: 215301, 1, Longteng Road, Kunshan, Jiangsu, Suzhou Patentee after: Kunshan Longteng Au Optronics Co Address before: 215301, 1, Longteng Road, Kunshan, Jiangsu, Suzhou Patentee before: Kunshan Longteng Optronics Co., Ltd. |