CN103106883A - Voltage regulating method of liquid crystal display - Google Patents
Voltage regulating method of liquid crystal display Download PDFInfo
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- CN103106883A CN103106883A CN2013100324913A CN201310032491A CN103106883A CN 103106883 A CN103106883 A CN 103106883A CN 2013100324913 A CN2013100324913 A CN 2013100324913A CN 201310032491 A CN201310032491 A CN 201310032491A CN 103106883 A CN103106883 A CN 103106883A
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Abstract
The invention provides a voltage regulating method of a liquid crystal display. The voltage regulating method for an effectless pixel unit includes the following steps. The effectless pixel unit is connected with a gray scale voltage generator through line walking. The effectless pixel unit generates kickback voltage delta Vp through a kickback voltage generating circuit. A kickback voltage compensation circuit performs voltage compensation for the kickback voltage delta Vp generated by the kickback voltage generating circuit and compensated kickback voltage delta Vp is obtained after compensation. A liquid crystal voltage generating circuit generates liquid crystal voltage. The compensated kickback voltage delta Vp and the liquid voltage undergo a conversion circuit device and then calculation of reference voltage and an addition/subtraction circuit to get proper tone voltage. A feedback collocation outer circuit of the effectless pixel unit in a liquid crystal panel component is used for working out feedback voltage, and then the kickback voltage compensation is used for keeping the compensated kickback voltage to be identical with the voltage of a normal pixel zone so that voltage is accurate and image quality is improved.
Description
Technical field
The present invention relates to a kind of voltage adjusting method of liquid crystal display.
Background technology
Figure 1 shows that the drives schematic diagram of available liquid crystal display, liquid crystal display comprises: liquid crystal panel assembly (PANEL) 10, data driver (the Data Drive IC) 20 that is connected to liquid crystal panel assembly 10 and gate drivers (Scan Drive IC) 30, be connected to data driver 20 grayscale voltage maker (Gamma Voltage Generator) 40, provide the DC-DC power supply (DC/DC) 60 of power supply for the time schedule controller (TCON) 50 of control gate driver 30 and data driver 20 and for liquid crystal display.Liquid crystal panel assembly 10 comprise lower display panel and the upper display panel of mutual correspondence and be folded in display panel and lower display panel between liquid crystal.
Suppose that the liquid crystal display horizontal direction has m bar sweep trace, vertical direction has n bar data line, is combined into the liquid crystal display of a n*m pixel, and sweep trace intersects and limits a plurality of film crystal pipe unit PX with data line.A plurality of film crystal pipe unit PX are matrix form and arrange, film crystal pipe unit PX is connected with display signal line, display signal line is disposed on lower display panel, and comprises that the multi-strip scanning line G0 that transmits signal is to many data line S1 of Gm and transmission of data signals to Sn.Sweep trace G0 extends in the horizontal direction and is parallel to each other to Gm, and data line S1 extends in vertical direction and is parallel to each other to Sn.
Each pixel PX comprises switchgear, liquid crystal capacitance and memory capacitance, switchgear comprises the grid (Gate) formed together with sweep trace, the source electrode (Source) be connected with data line and the drain electrode (Drain) be connected with pixel electrode, and memory capacitance is connected to switchgear abreast.
Grid control signal CONT1 comprises when scanning initialize signal STV exports gate-on voltage Von with initialization scan and at least one clock signal to control.Grid control signal CONT1 can also comprise the duration (duration) of output enable signal OE to define gate turn-on signal Von.
Data controlling signal CONT2 comprise horizontal-drive signal STH with notification data driver 20 for the beginning of the data transmission of one group of pixel, be written into signal LOAD, with designation data driver 20, data voltage be applied to S1 to Sn and data clock signal HCLK.Data controlling signal CONT2 can also comprise that reverse signal RSV is with the polarity with respect to common electric voltage Vcom reversal data voltage.
According to the described liquid crystal display of Fig. 1, by received image signal (R, G, B) and input timing control signal, with the demonstration of control inputs picture signal.
As shown in Figure 2, under the structure of available liquid crystal display, always there is inactive pixels (Dummy pixel) 11 in liquid crystal panel assembly (PANEL) 10, grayscale voltage maker 40 is to produce voltage V1 ~ Vn by electric resistance partial pressure and operational amplifier OP, inactive pixels unit on liquid crystal panel assembly (PANEL) 10 (Dummy pixel) 11 is not used to do computing, and how making the electric capacity of the pixel of inactive pixels unit and normal region not there are differences is to need the problem solved.
Summary of the invention
The object of the present invention is to provide a kind of voltage adjusting method that makes the liquid crystal display that inactive pixels on the liquid crystal panel assembly is consistent with the voltage of the pixel of normal region, make the voltage on the liquid crystal panel assembly more accurate, promote the picture quality of liquid crystal display.
The invention provides a kind of voltage adjusting method of liquid crystal display, liquid crystal display comprises: liquid crystal panel assembly, the data driver that is connected to the liquid crystal panel assembly and gate drivers, be connected to data driver the grayscale voltage maker, provide the DC-DC power supply of power supply for the time schedule controller of control gate driver and data driver and for liquid crystal display, the liquid crystal panel assembly has normal pixel unit and inactive pixels unit, as follows to the voltage adjusting method of inactive pixels unit:
The inactive pixels unit is connected to the grayscale voltage maker by cabling;
The inactive pixels unit recalcitrates voltage Δ Vp through recalcitrating the voltage generation circuit generation;
The voltage Δ Vp that recalcitrates that recalcitrates that voltage compensating circuit will recalcitrate that voltage generation circuit produces carries out voltage compensation and recalcitrates voltage Δ Vp after being compensated
mend;
Liquid crystal voltage produces circuit and produces liquid crystal voltage;
Recalcitrate voltage Δ Vp after compensation
mendand liquid crystal voltage calculates suitable contrast voltage by reference to voltage and addition/subtraction circuit again after conversion circuit device.
The present invention is by the back coupling collocation external circuit of the inactive pixels unit in the liquid crystal panel assembly, feedback voltage is calculated, again through recalcitrating (Feedthrough) voltage compensating circuit make after compensation to recalcitrate voltage consistent with the voltage in the normal pixel zone, make voltage more accurate, promote image quality.
The accompanying drawing explanation
The drives schematic diagram that Fig. 1 is the available liquid crystal display;
There is the schematic diagram of inactive pixels on the liquid crystal panel assembly that Fig. 2 is the available liquid crystal display;
The compensating circuit schematic diagram that Fig. 3 is liquid crystal display of the present invention;
The square circuit diagram that Fig. 4 is the described compensating circuit of Fig. 3;
Fig. 5 is the schematic diagram that recalcitrates the sample circuit of (Feedthrough) voltage generation circuit;
The schematic diagram that Fig. 6 is one of subtraction circuit figure;
Two the schematic diagram that Fig. 7 is subtraction circuit figure;
The sequential control figure that Fig. 8 is the sample circuit shown in Fig. 5;
The schematic diagram of the characteristic that Fig. 9 is the liquid crystal panel assembly;
The schematic diagram of the compensating circuit that Figure 10 and Figure 11 are the liquid crystal panel assembly;
The schematic diagram of the characteristic that Figure 12 is the liquid crystal panel assembly;
The schematic diagram of the compensating circuit that Figure 13 to Figure 15 is the liquid crystal panel assembly;
The V-T curve map of the circuit diagram that Figure 16 is the liquid crystal voltage generation.
Embodiment
Below in conjunction with the drawings and specific embodiments, further illustrate the present invention, should understand these embodiment only is not used in and limits the scope of the invention for the present invention is described, after having read the present invention, those skilled in the art all fall within the application's claims limited range to the modification of the various equivalent form of values of the present invention.
The present invention discloses a kind of voltage adjusting method and compensating circuit of liquid crystal display, as shown in Figure 3, liquid crystal display comprises: the data driver of liquid crystal panel assembly (PANEL) 10, liquid crystal panel assembly 10 (Data Drive IC) 20 and gate drivers (Scan Drive IC) 30, be connected to data driver 20 grayscale voltage maker (Gamma Voltage Generator) 40, provide the DC-DC power supply (DC/DC) 60 of power supply for the time schedule controller (TCON) 50 of control gate driver 30 and data driver 20 and for liquid crystal display.Liquid crystal panel assembly 10 comprise lower display panel and the upper display panel of mutual correspondence and be folded in display panel and lower display panel between liquid crystal.
Always there is inactive pixels unit (Dummy pixel) 11 in liquid crystal panel assembly (PANEL) 10, the present invention recalcitrates voltage by recalcitrating 41 generations of (Feedthough) voltage generation circuit, recalcitrate (Feedthrough) voltage compensating circuit 48 and will together the voltage that recalcitrates that recalcitrates 41 generations of (Feedthough) voltage generation circuit be carried out to voltage compensation, by cabling, inactive pixels unit 11 is connected to grayscale voltage maker 40, make the inactive pixels unit consistent with the pixel of normal region, by the back coupling by inactive pixels unit 11, be connected on grayscale voltage maker 40, produce contrast voltage (V1 ~ Vn) after suitable computing, in the process of feedbacking in inactive pixels 11, time schedule controller (TCON) 50 and grayscale voltage maker 40 need to be made corresponding modification.
Owing to must by cabling, voltage being drawn inactive pixels, so the equivalent capacity of the pixel of inactive pixels and normal region has a little difference, therefore obtained recalcitrating (Feedthrough) the voltage Δ Vp by inactive pixels, need to recalcitrate voltage Δ Vp after recalcitrating the compensation that (Feedthrough) voltage compensating circuit 48 obtains
mendjust there is no error with recalcitrating on normal region (Feedthrough) voltage, recalcitrating after over-compensation (Feedthrough) voltage will be more accurate.
Described recalcitrating (Feedthrough) voltage compensating circuit 48 is arranged in data driver (Data Drive IC) 20, and according to the needs of panel designs, this recalcitrates (Feedthrough) voltage compensating circuit 48 and also can arrange separately certainly.
The present invention back kick (Feedthough) voltage generation circuit 41 and the back kick (Feedthrough) voltage compensation circuit 48 together with the back kick (Feedthrough) voltage compensation method is as follows: From the LCD panel (Panel) on invalid pixel 10 (Dummy? Pixel) unit 11 generates a feedback signal is sent back kick (Feedthough) voltage generation circuit 41, back kick (Feedthough) voltage generation circuit 41 generates a voltage kick back ΔVp, back kick (Feedthrough) voltage compensation circuit 48 back kick (Feedthough) voltage generation circuit 41 generates voltage ΔVp be kicked back to get compensated voltage compensation voltage ΔVp <sub TranNum="90"> kick back up </ sub>, after a back kick voltage compensated ΔVp <sub TranNum = "91" > fill </ sub> by the first analog / digital conversion circuit 43 is converted to a digital format stored in the digital storage circuit 44, and the liquid crystal voltage generation circuit 42 generates the liquid crystal voltage Vlc Vlc also after the first analog / digital conversion circuit 43 is converted to a digital format is stored in the digital storage circuit 44.When producing contrast voltage, then numerical data is converted to voltage by the second numeral/analogy change-over circuit 45, collocation VCOM reference voltage 47, then produce required contrast voltage (V1 ~ Vn) by addition/subtraction circuit 46.
Recalcitrate voltage Δ Vp after compensation
mendreach liquid crystal voltage Vlc and deposit in after first kind ratio/digital conversion circuit 43 in digital storage circuit 44, to guarantee the stability of voltage; Recalcitrate voltage Δ Vp after compensating during computing again
mendand liquid crystal voltage Vlc calculates most suitable contrast voltage (V1～Vn) through the second numeral/analogy change-over circuit 45 and addition/subtraction circuit 46.
Wherein, first kind ratio/digital conversion circuit 43 is all identical with function with the second numeral/analogy change-over circuit 45 effects, be all that voltage transitions is digital format, and recalcitrate voltage generation circuit 41, liquid crystal voltage and produce circuit 42, first kind ratio/digital conversion circuit 43, digital storage circuit 44, the second numeral/analogy change-over circuit 45, addition/subtraction circuit 46 and VCOM reference voltage 47 and all be positioned at grayscale voltage maker 40.
If, without recalcitrating (Feedthrough) voltage compensating circuit 48, can't accurately obtain the magnitude of voltage that recalcitrates of each contrast; And because contrast voltage is fixed value, once determine just can't to change easily, therefore need to compensate before the contrast magnitude of voltage obtaining; In panel process conditions when change,, contrast voltage just must be readjusted, therefore need to recalcitrate voltage and compensate by recalcitrating 48 pairs of (Feedthrough) voltage compensating circuits; The contrast adjustment process is loaded down with trivial details, requires great effort consuming time, if compensate in advance by recalcitrating (Feedthrough) voltage compensating circuit 48, simplifies procedures.
The process of voltage that recalcitrates for recalcitrating 41 generations of (Feedthrough) voltage generation circuit shown in following Fig. 5 to Fig. 8.
Figure 5 shows that the schematic diagram of the sample circuit that recalcitrates (Feedthrough) voltage generation circuit 41, suppose that sample circuit comprises sweep trace G0 and G1, data line S1 and S2, by sweep trace G0, G1 and data line S1, S2, intersects four pixel cells and four operational amplifiers (first to fourth operational amplifier OP1, OP2, OP3, OP4) that limit.Suppose that again described four pixel cells are respectively: the first inactive pixels unit 111, the second inactive pixels unit 112, the first normal pixel unit 101, the second normal pixel unit 102, wherein, the first inactive pixels 111 and the first normal pixel unit 101 are the positive polarity pixel cell, and the second inactive pixels 112 and the second normal pixel unit 102 are the negative polarity pixel cell.Positive polarity pixel cell and second, the first operational amplifier OP2 are connected with OP1, and the first operational amplifier OP1 and the second operational amplifier OP2 are and are set up in parallel, and such the first operational amplifier OP1 is identical with the voltage of the second operational amplifier OP2 output; And connect the first switch SW 1 and capacitor C 1 in the first operational amplifier OP1, this first switch SW 1 is controlled the break-make of the first operational amplifier OP1; Negative polarity pixel cell and the 4th, the 3rd operational amplifier OP4 are connected with OP3, and the 3rd operational amplifier OP3 and four-operational amplifier OP4 are and are set up in parallel, and such the 3rd operational amplifier OP3 is identical with the voltage of four-operational amplifier OP4 output; And the 3rd operational amplifier OP3 connects second switch SW2 and capacitor C 2, this second switch SW2 controls the break-make of the 3rd operational amplifier OP3.
Include a TFT and three electric capacity (Cgd, Clc, Cs) in each pixel cell, the source electrode of TFT (Source) 71 is connected with S2 with data line S1, and the grid of TFT (Gate) 72 is connected with G1 with sweep trace G0.The drain electrode of TFT (Drain) 73 is connected with pixel electrode, and capacitor C ls and Cs all are located between drain electrode (Drain) 73 and VCOM of TFT, and capacitor C gd is located between the drain electrode (Drain) 73 of sweep trace G0 and G1 and TFT.
The high-potential voltage of supposing sweep trace G0 and G1 is Vgh, and the low-potential voltage of sweep trace G0 and G1 is Vgl, and it is as follows that the sample circuit that originally recalcitrates (Feedthrough) voltage generation circuit 41 produces the step recalcitrate voltage:
The first step: when the voltage of sweep trace G0 rises to noble potential Vgh by electronegative potential Vgl, TFT opens, first, second switch SW 1, SW2 closure, now to the liquid crystal charging in the first inactive pixels unit 111 and the second inactive pixels unit 112, the drain electrode of TFT (Drain) 73 end output voltage V d1, Vd2 export corresponding capacitor C 1 and C2 to via the first, the 3rd operational amplifier OP1, OP3 respectively respectively for data line S1 and S2.
Second step: then first, second switch SW 1, SW2 opened before the voltage of sweep trace G0 drops to electronegative potential Vgl by noble potential Vgh, and the drain electrode of TFT (Drain) 73 end output voltage V d1 and Vd2 are held in respectively in capacitor C 1 and C2.
The 3rd step: when the voltage of sweep trace G0 drops to electronegative potential Vgl by noble potential Vgh, TFT merges, based on the electric charge principle of not going out, drain electrode (Drain) 73 terminal voltages of the first inactive pixels unit 111 and the second inactive pixels unit 112 can be experienced respectively voltage drop Δ Vp1 and the Δ Vp2 of a negative sense, now by the second operational amplifier OP2, obtain voltage (Vd1-Δ Vp1), by four-operational amplifier OP4, obtain voltage (Vd2-Δ Vp2).
The 4th step: the output voltage V d1 that will obtain from the first inactive pixels unit 111 and the second operational amplifier OP2 obtain voltage (Vd1-Δ Vp1) and subtract each other and can obtain recalcitrating voltage Δ Vp1, and the subtraction circuit by as shown in Figure 6 obtains recalcitrating voltage; In like manner, the output voltage V d2 that will obtain from the second inactive pixels unit 112 and four-operational amplifier OP4 obtain voltage (Vd2-Δ Vp2) and subtract each other and can obtain recalcitrating voltage Δ Vp2, and the subtraction circuit by as shown in Figure 7 obtains recalcitrating voltage.
Because the first inactive pixels unit 111 and the second inactive pixels unit 112 are opposite polarity, so recalcitrating voltage Δ Vp1 and recalcitrating of obtaining recalcitrates voltage Δ Vp value under the liquid crystal voltage that voltage Δ Vp2 represents respectively positive and negative polarity, if Δ Vp1=Δ Vp2, the representative positive negative balance of liquid crystal voltage now, voltage now is the Δ Vp value of actual panel.
Figure 8 shows that the sequential schematic diagram of first, second switch SW 1, SW2, at T1 in the time, the SW1andSW2 closure, at T2, in the time, SW1 and SW2 open.
For recalcitrating (Feedthrough) voltage compensating circuit 48 compensation, producing and recalcitrate voltage Δ Vp after compensation shown in following Fig. 9 to Figure 15
mendprocess.
The function that recalcitrates (Feedthrough) voltage compensating circuit 48 does not just compensate merely, also can, according to the characteristic difference of zones of different from left to right on liquid crystal panel assembly 10, different compensation way (as Fig. 9) be arranged.If it is linear that the characteristic of liquid crystal panel assembly 10 (left-to-right) is, use linear compensation way, if the characteristic of liquid crystal panel assembly 10 (left-to-right) is non-linear, use the compensation of nonlinearity mode, what can solve like this that difference because of equivalent capacity causes recalcitrates (Feedthrough) voltage error, can compensate for each region characteristic of panel is different again simultaneously, make sampled recalcitrating (Feedthrough) voltage more accurate, promote and show image quality.
If it is linear that the characteristic of liquid crystal panel assembly 10 (left-to-right) is, linear compensation way is divided into following three kinds, a kind of is the left-to-right fixed value compensation (y=a that adopts, as shown in a of Fig. 9), a kind ofly for the left-to-right asymptotic expression of adopting, increase progressively compensation (y=ax+b, as shown in the b of Fig. 9), a kind ofly for left-to-right, adopt the asymptotic expression compensation (y=ax+b, as shown in the c of Fig. 9) of successively decreasing.
If the characteristic of liquid crystal panel assembly 10 (left-to-right) is non-linear, be Non-Linear Compensating type and distinguish following three kinds, a kind of is the left-to-right Throwing of adopting thing line compensation (y=ax
c+ b, as shown in the e of Fig. 9), a kind of is left-to-right exploiting field piece incremental manner compensation (as shown in the f of Fig. 9), a kind of is the compensation (as shown in the g of Fig. 9) of successively decreasing of left-to-right exploiting field piece.
Although six kinds of compensation ways have been described above, beyond these six kinds of modes, as long as principle, concept identical also belong to protection category of the present invention.
For instance, suppose the left side of liquid crystal panel assembly 10, right both sides exist respectively one to recalcitrate voltage sample circuit, so just, can obtain respectively a left side, right both sides pixel recalcitrate voltage, suppose that liquid crystal panel assembly 10 left sides recalcitrate voltage and are called a Δ Vp_ left side, liquid crystal panel assembly 10 right sides recalcitrate voltage and are called the Δ Vp_ right side, the characteristic of supposing liquid crystal panel assembly 10 (left-to-right) is linear (as shown in the a-c of Fig. 9), and liquid crystal panel assembly 10 left and right compensate respectively definite value and are assumed to be definite value Va, the voltage that recalcitrates after the 10 left side compensation of the liquid crystal panel assembly after the compensation is a Δ Vp_ left side+Va, and the voltage that recalcitrates after the liquid crystal panel assembly 10 right side compensation after compensation is the Δ Vp_ right side+Va, the 10 left side compensation methodes of liquid crystal panel assembly and circuit adding circuit as shown in figure 10, the 10 right side compensation methodes of liquid crystal panel assembly and circuit adding circuit as shown in figure 11, after left and right sides compensation the voltage that recalcitrates be called respectively Δ Vp
mend_ left and Δ Vp
mend_ the right side, i.e. Δ Vp
mend_ left side=Δ Vp_ left side+Va, Δ Vp
mend_ the right side=Δ Vp_ the right side+Va.
According to the actual characteristic of liquid crystal panel assembly 10, Va can be arbitrary value.
Suppose that gate drivers (Scan Drive IC) 30 is positioned at liquid crystal panel assembly 10 left sides, liquid crystal panel assembly 10 is distributed by parabolic shape as shown in figure 14 by the left-to-right voltage Δ Vp that recalcitrates, be greatly and distribute to little trend by left-to-right Δ Vp, for the shape shown in Figure 12, can not adopt the left and right definite value of said method to compensate.Also can be for panel by the left-to-right compensation of carrying out multiple spot and different voltages, the sampling spot quantity of compensation depends on the needs.
For instance, if liquid crystal panel assembly 10 need to carry out a left side, in, right 3 compensation, be liquid crystal panel assembly 10 left sides, in, right three sides exist respectively one to recalcitrate voltage sample circuit, can obtain respectively a left side, in, right pixel recalcitrate voltage, suppose that liquid crystal panel assembly 10 left sides recalcitrate voltage and are called a Δ Vp_ left side, the voltage that recalcitrates in the middle of liquid crystal panel assembly 10 is called in Δ Vp_, liquid crystal panel assembly 10 right sides recalcitrate voltage and are called the Δ Vp_ right side, and liquid crystal panel assembly 10 recalcitrates voltage Δ Vp as shown in figure 14 by left-to-right, a Δ Vp_ left side>in Δ Vp_>the Δ Vp_ right side, by the left-to-right voltage compensating method that recalcitrates, can use non-definite value, non-linear method completes, the bucking voltage of supposing left side is Va, middle bucking voltage is Vb, the bucking voltage on right side is Vc, and Va<Vb<Vc, after left side compensation, recalcitrate voltage Δ Vp
mend_ left side=Δ Vp_ left side+Va, recalcitrate voltage Δ Vp after middle compensation
mend_ in=Δ Vp_ in+Vb, recalcitrate voltage Δ Vp after right side compensation
mend_ the right side=Δ Vp_ the right side+Vc, the 10 left side compensation methodes of liquid crystal panel assembly and circuit adding circuit as shown in figure 13, compensation method and circuit adding circuit as shown in figure 14 in the middle of liquid crystal panel assembly 10, the 10 right side compensation methodes of liquid crystal panel assembly and circuit adding circuit as shown in figure 15, can make Δ Vp after the compensation by this way
mend_ left==Δ Vp
mend_ in=Δ Vp
mend_ the right side, and liquid crystal panel assembly 10 will be more even.
Figure 16 shows that the V-T curve map of the circuit diagram that liquid crystal voltage shown in Fig. 4 produces, step is as follows:
The first step: (for example: Gamma curve=2.2), the tone curve target not only is defined in 2.2, can, according to deviser's requirement, be made as any curve to set desirable tone curve target.
Second step: desirable tone curve transverse axis is contrast (0 ~ 255), and the longitudinal axis is transmitance (T), and curve can obtain the corresponding transmitance of each contrast thus.
Liquid crystal voltage-transmitance (Vlc-T) curve, transverse axis is liquid crystal voltage (Vlc), the longitudinal axis is transmitance (T), curve can be for contrast (0 rank, 4 rank, 64 rank, 128 rank, 192 rank, 252 rank, 255 rank) thus, obtain liquid crystal voltage (Vlc) via transmitance (T) correspondence, if the 14 groups of contrast voltages of take are example, liquid crystal voltage will be defined as Vlc1 ~ Vlc7.
By above-mentioned steps, for contrast (0 rank, 4 rank, 64 rank, 128 rank, 192 rank, 252 rank, 255 rank), can obtain 7 groups corresponding to after the compensation of contrast, recalcitrating voltage Δ Vp
mendvalue (is defined as Δ Vp
mend0, Δ Vp
mend4, Δ Vp
mend64, Δ Vp
mend128, Δ Vp
mend192, Δ Vp
mend252, Δ Vp
mend255).Only for giving an example, described contrast can be (0 ~ 255) arbitrary order herein.
For contrast (0 rank, 4 rank, 64 rank, 128 rank, 192 rank, 252 rank, 255 rank), can obtain respectively and recalcitrate voltage Δ Vp after corresponding compensation
mend(Δ Vp
mend0, Δ Vp
mend4, Δ Vp
mend64, Δ Vp
mend128, Δ Vp
mend192, Δ Vp
mend252, Δ Vp
mend255) and liquid crystal voltage (Vlc1 ~ Vlc7),, via first kind ratio/digital conversion circuit 43, analog voltage can be converted to digital format and deposit in digital storage circuit 44 (routine EEPROM storage circuit) arbitrarily.Follow-up while wanting computing from then on storage circuit by the second numeral/analogy change-over circuit 45 by voltage transitions out, then produce necessary contrast voltages (V1～Vn, n=14 herein) via VCOM reference voltage 47, addition and subtraction circuit 46.After addition/subtraction circuit 46, can the following contrast voltage of contented generation, reach the purpose that automatic contrast is adjusted, the computing formula of contrast voltage is as follows:
Contrast voltage (just)=VCOM+Vlc+ △ Vp
mend
Contrast voltage (bearing)=VCOM-Vlc+ △ Vp
mend
The result of calculation of contrast voltage is as table one:
Table one: the result of calculation of contrast voltage
That obtains specific contrast (for example: 0 rank, 4 rank, 64 rank, 128 rank, 192 rank, 252 rank, 255 rank) recalcitrates voltage Δ Vp value, time schedule controller shown in Fig. 3 (TCON) 50 is essential to be revised, and the sample circuit of Fig. 5 to Fig. 7 and subtraction circuit must have seven groups (as shown in Figure 9), by time schedule controller (TCON) 50, the data of specific contrast (0 rank, 4 rank, 64 rank, 128 rank, 192 rank, 252 rank, 255 rank) are sent to the specific pixel on the inactive pixels unit, this specific pixel is the pixel that possesses sample circuit.
The present invention is by recalcitrating the compensation method of (Feedthrough) voltage, can solve inactive pixels and normal region pixel recalcitrate (Feedthrough) voltage error, booster tension accuracy.
Claims (10)
1. the voltage adjusting method of a liquid crystal display, liquid crystal display comprises: liquid crystal panel assembly, the data driver that is connected to the liquid crystal panel assembly and gate drivers, be connected to data driver the grayscale voltage maker, provide the DC-DC power supply of power supply for the time schedule controller of control gate driver and data driver and for liquid crystal display, the liquid crystal panel assembly has normal pixel unit and inactive pixels unit, it is characterized in that: the voltage adjusting method to the inactive pixels unit is as follows:
The inactive pixels unit is connected to the grayscale voltage maker by cabling;
The inactive pixels unit recalcitrates voltage Δ Vp through recalcitrating the voltage generation circuit generation;
The voltage Δ Vp that recalcitrates that recalcitrates that voltage compensating circuit will recalcitrate that voltage generation circuit produces carries out voltage compensation and recalcitrates voltage Δ Vp after being compensated
mend;
Liquid crystal voltage produces circuit and produces liquid crystal voltage;
Recalcitrate voltage Δ Vp after compensation
mendand liquid crystal voltage calculates suitable contrast voltage by reference to voltage and addition/subtraction circuit again after conversion circuit device.
2. the voltage adjusting method of liquid crystal display according to claim 1, it is characterized in that: when liquid crystal panel assembly recalcitrating voltage Δ Vp and be linearity from left to right, liquid crystal panel assembly left side recalcitrates voltage and is called a Δ Vp_ left side, liquid crystal panel assembly right side recalcitrates voltage and is called the Δ Vp_ right side, it is definite value Va that liquid crystal panel assembly left and right compensates respectively definite value, the voltage that recalcitrates after the compensation of liquid crystal panel assembly left side is a Δ Vp_ left side+Va, the voltage that recalcitrates after the compensation of liquid crystal panel assembly right side is the Δ Vp_ right side+Va, and a Δ Vp_ left side+Va=Δ Vp_ right side+Va.
3. the voltage adjusting method of liquid crystal display according to claim 1, it is characterized in that: when the liquid crystal panel assembly is the parabolic shape distribution by the left-to-right voltage Δ Vp that recalcitrates, liquid crystal panel assembly left side recalcitrates voltage and is called a Δ Vp_ left side, the voltage that recalcitrates in the middle of the liquid crystal panel assembly is called in Δ Vp_, liquid crystal panel assembly right side recalcitrates voltage and is called the Δ Vp_ right side, and a Δ Vp_ left side>in Δ Vp__>the Δ Vp__ right side; The bucking voltage in left side is Va, and middle bucking voltage is Vb, and the bucking voltage on right side is Vc, and Va<Vb<Vc, after the compensation of left side, recalcitrates voltage Δ Vp
mend_ left side=Δ Vp_ left side+Va, recalcitrate voltage Δ Vp after middle compensation
mend_ in=Δ Vp_ in+Vb, recalcitrate voltage Δ Vp after right side compensation
mend_ the right side=Δ Vp_ the right side+Vc, and Δ Vp
mend_ left==Δ Vp
mend_ in=Δ Vp
mend_ the right side.
4. according to the voltage adjusting method of the described arbitrary liquid crystal display of claims 1 to 3, it is characterized in that:
Recalcitrating voltage compensating circuit is arranged in data driver.
5. the voltage adjusting method of liquid crystal display according to claim 1, it is characterized in that: described recalcitrating in voltage generation circuit is provided with sample circuit, sample circuit comprises the sweep trace of some intersections and data line, by sweep trace and data line, intersects some pixel cells and the some operational amplifiers limited, at least be provided with a pair of opposite polarity inactive pixels unit and normal pixel unit in pixel cell, each inactive pixels unit all connects and is operational amplifier one and the operational amplifier two be set up in parallel, and wherein operational amplifier one is connected with switch and electric capacity; Include a TFT in each pixel cell, the drain electrode of TFT is connected with operational amplifier two with the operational amplifier be set up in parallel, and it is as follows that the sample circuit that originally recalcitrates voltage generation circuit produces the step recalcitrate voltage:
The first step: when the voltage of sweep trace rises to noble potential by electronegative potential, TFT opens, the switch closure of operational amplifier one, now data line is to the charging of the liquid crystal in the inactive pixels unit, and the drain electrode end output voltage of TFT exports the electric capacity of corresponding operational amplifier one to through corresponding operational amplifier one;
Second step: then the switch of operational amplifier one was opened before the voltage of sweep trace drops to electronegative potential by noble potential, and drain electrode end output voltage V d is held in the electric capacity of operational amplifier one;
The 3rd step: when the voltage of sweep trace drops to electronegative potential by noble potential, TFT merges, and the drain terminal voltage of inactive pixels unit can be experienced the voltage drop Δ Vp of a negative sense, by operational amplifier two, obtains voltage (Vd-Δ Vp);
The 4th step: the drain electrode end output voltage V d that will obtain from the inactive pixels unit and operational amplifier two are obtained voltage (Vd-Δ Vp) can obtain recalcitrating voltage Δ Vp by subtraction circuit.
6. the voltage adjusting method of liquid crystal display according to claim 5, it is characterized in that: also comprise three capacitor C gd, Clc, Cs in each pixel cell, capacitor C ls and Cs all are located between the drain electrode and VCOM of TFT, and capacitor C gd is located between the drain electrode of sweep trace and TFT.
7. the voltage adjusting method of liquid crystal display according to claim 1 is characterized in that: the step of the circuit diagram that liquid crystal voltage produces is as follows:
Set desirable tone curve target, desirable tone curve transverse axis is contrast (0 ~ 255), and the longitudinal axis is transmitance (T);
By liquid crystal voltage-transmitance (Vlc-T) curve, transverse axis is liquid crystal voltage (Vlc), and the longitudinal axis is transmitance (T), and desirable tone curve is for the n contrast, obtain liquid crystal voltage (Vlc) via transmitance (T) correspondence, liquid crystal voltage will be defined as Vlc1 ~ Vlcn.
Obtain the n group for the n contrast and recalcitrate voltage Δ Vp after corresponding to the compensation of contrast
mendvalue and liquid crystal voltage Vlc1～Vlcn calculate suitable contrast voltage by reference to voltage VCOM and addition/subtraction circuit again after conversion circuit device, and the computing formula of contrast voltage is as follows:
Contrast voltage (just)=VCOM+Vlc+ △ Vp
mend
Contrast voltage (bearing)=VCOM-Vlc+ △ Vp
mend.
8. the voltage adjusting method of liquid crystal display according to claim 7, it is characterized in that: described contrast n is at least 7, be respectively: 0 rank, 4 rank, 64 rank, 128 rank, 192 rank, 252 rank, 255 rank, these 7 groups are respectively corresponding to the voltage that recalcitrates after the compensation of contrast: Δ Vp
mend0, Δ Vp
mend4, Δ Vp
mend64, Δ Vp
mend128, Δ Vp
mend192, Δ Vp
mend252, Δ Vp
mend255.
9. according to the voltage adjusting method of claim 1 or 7 described liquid crystal display, it is characterized in that: conversion circuit device comprises first kind ratio/digital conversion circuit, the digital storage circuit, and the second numeral/analogy change-over circuit, panel inactive pixels feedback signal mode is: recalcitrate after voltage is converted to digital format by first kind ratio/digital conversion circuit and deposit in the digital storage circuit, also deposit in the digital storage circuit after after the circuit of liquid crystal voltage generation simultaneously generation liquid crystal voltage, liquid crystal voltage also being converted to digital format by first kind ratio/digital conversion circuit simultaneously, when producing contrast voltage, again numerical data is converted to voltage by the second numeral/analogy change-over circuit, collocation VCOM reference voltage, produce required contrast voltage by the addition/subtraction circuit again.
10. the voltage adjusting method of liquid crystal display according to claim 9, is characterized in that: recalcitrate voltage generation circuit, liquid crystal voltage generation circuit, first kind ratio/digital conversion circuit, digital storage circuit, the second numeral/analogy change-over circuit, addition/subtraction circuit and VCOM reference voltage and all be positioned at the grayscale voltage maker.
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| US11054849B2 (en) | 2019-07-12 | 2021-07-06 | Himax Technologies Limited | Source driver and output buffer thereof |
| TWI741326B (en) * | 2019-07-26 | 2021-10-01 | 奇景光電股份有限公司 | Source driver and output buffer thereof |
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