CN1389844A - Liquid crystal display device with regulatable gradation coefficient curve - Google Patents
Liquid crystal display device with regulatable gradation coefficient curve Download PDFInfo
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- CN1389844A CN1389844A CN01137120A CN01137120A CN1389844A CN 1389844 A CN1389844 A CN 1389844A CN 01137120 A CN01137120 A CN 01137120A CN 01137120 A CN01137120 A CN 01137120A CN 1389844 A CN1389844 A CN 1389844A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
- G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/066—Adjustment of display parameters for control of contrast
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3607—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
Abstract
A liquid crystal display is provided with a liquid crystal module. An external picture signal source outputs RGB gray scale signals for displaying picture images. The liquid crystal display module is adapted to the RGB gray scale signals to control a gamma curve. The liquid crystal display module outputs one or more rigid positive/negative gray scale voltages, and one or more variable positive/negative gray scale voltages on the basis of the controlled gamma curve, thereby displaying the desired picture images.
Description
Technical field
The present invention relates to Liquid Crystal Display And Method For Driving, more particularly, relate to the control gamma curves adapting to the LCD of input gray level level data, thereby show the screen picture of high-contrast and do not lose any gray-scale data.
Background technology
Generally, under the situation of LCD, needed grayscale voltage quantity is directly proportional with the quantity of data bit (bit).For example, 3 Bit datas are corresponding to 8 grayscale voltages.Recently proposed 6 bits or 8 Bit datas are used for display application, therefore, the quantity of needed gray-scale data will increase a lot.
And, make that in independent mode all this quantitative increases of grayscale voltage are very difficult.Therefore, the drive integrated circult that is used for LCD only receives 8 or 9 grayscale voltages from the external world, and the electric resistance partial pressure method generates middle grayscale voltage.
For example, from 10 grayscale voltage V0 to V9 of external world's input, and intermediate voltage value generates in drive integrated circult inside according to predetermined rule.Make the grayscale voltage value sequence tend to form a curve.Because liquid crystal carries out light transmission with nonlinear way, so should proofread and correct to obtain consistent light-transfer characteristic.This is called " gamma correction ", and will be used for the curve that gamma proofreaies and correct and be called " gamma curves ".
Figure 1A to 1C is the figure of this gamma curves of explanation, and wherein brightness range is expressed as the function of gray-scale data scope.Shown in Figure 1A, TFT LCD module commonly used has the gamma curves of γ=2.2.
But this have some shortcomings about the fixing gamma curves of input gray level level data.
Under the situation of brighter relatively screen picture, such as longshore landscape, most input gray level level data are high brightness, and therefore at whole screen area, contrast descends.That is to say that shown in Figure 1B, brightness range diminishes, the result causes contrast to descend.
Shown in Fig. 1 C, under the situation of darker relatively screen picture, such as the forest landscape, most input gray level level data are low-light level, therefore also descend in whole screen area contrast.
For this reason, in most LCD monitors or graphics card, be set to user oneself and can directly select and use suitable gamma curves.
Mainly use the user under the situation of bright screen curtain, the gamma constant is set to greater than 2.2.On the contrary, mainly use the user under the situation of dark screen, the gamma constant is set to less than 2.2.Like this, brightness range broadens, thus enhancing contrast ratio.
But there are the following problems for the technology of aforesaid control gamma curves.
Because gamma curves is to fixedly install or manually operated, so the control of gamma curves should one by one be carried out respectively under different display screen states.Under the situation of γ＞2.2, show slinkingly and show that screen will become darker, and contrast descends.On the contrary, under the situation of γ＜2.2, it is brighter that the bright screen curtain will become, and contrast descends.
In addition, under the situation of γ＞2.2, gray-scale data will be extracted predetermined total amount, thereby in the color zones data degradation near black.On the contrary, under the situation of γ＜2.2, gray-scale data will be increased predetermined total amount, thereby in the color zones data degradation near white.The gray-scale data that this makes impossible all expectations of expression.
For example, when showing zero (0), may change gray-scale data by removing or increase by four (4) individual gray-scale data to 63 (63) individual gray-scale data.In this case, lose and approach 0 to the 3rd complete black gray-scale data or approach complete the 66th to the 63rd white gray-scale data.
Along with gamma curves control is carried out with big more grade, the data total amount increase irrelevant with the gray shade scale expression of expectation is big more.
Summary of the invention
An object of the present invention is to provide and a kind ofly can control gamma curves and do not lose the LCD of any gray-scale data.
Another object of the present invention provides a kind of method that drives this LCD.
These and other objects of the present invention can realize by the LCD with following characteristics.
This LCD receives RGB gray shade scale signal from the external world, and according to the RGB gray shade scale signal display frame image that receives.LCD disposes LCD MODULE.LCD MODULE adapts to RGB gray shade scale signal with the control gamma curves, and exports one or more variable grayscale voltages according to the gamma curves of being controlled.
According to an aspect of the present invention, LCD MODULE comprises: D/A converter is used for the numeric type RGB gray-scale data from the picture signal source is converted to analogue type gray shade scale signal.The grayscale voltage generation unit is to have the gamma curves of predetermined gamma constant and export one or more fixing or variable grayscale voltages according to this gamma curves with the signal transformation of analogue type gray shade scale.
According to another aspect of the present invention, this LCD MODULE comprises the grayscale voltage generation unit.This grayscale voltage generation unit will be the gamma curves with predetermined gamma constant from the gray shade scale signal transformation of the analogue type in picture signal source, and according to the one or more fixing or variable grayscale voltages of this gamma curves output.
According to another aspect more of the present invention, this LCD MODULE comprises screen intensity determining unit and grayscale voltage generation unit.The screen intensity determining unit detects from the RGB gray-scale data in picture signal source so that detect the level of screen intensity, and according to the luminance level output control voltage that detects.It is the gamma curves with predetermined gamma constant that the grayscale voltage generation unit will be controlled voltage transformation, and according to the one or more fixing or variable grayscale voltages of this gamma curves output.
The conversion that controls voltage to gamma curves is linear or nonlinear, decides according to predetermined gamma constant.The gamma curves of conversion is placed high, medium and low level, and in the level of interaction distance (inter-level distance) of the center of the gamma curves level of interaction distance more than or equal to fringe region.When the luminance level of display screen was higher than the luminance level of middle gray hierarchy level, the gamma constant was greater than the gamma constant relevant with the middle gray hierarchy level; And when the luminance level of display screen was lower than the luminance level of middle gray hierarchy level, the gamma constant was less than the gamma constant relevant with the middle gray hierarchy level.
The screen intensity determining unit comprises square wave output unit and analog-converted unit.The square wave output unit calculates the mean value that is used for the gray-scale data of 1H from external world's input, and exports predetermined dutycycle (duty) signal according to the mean value of this gray-scale data.The analog-converted unit will be control voltage from the duty cycle signals analog-converted of square wave output unit, and export this and control voltage to the grayscale voltage generation unit.
The square wave output unit comprises adder unit, be used for each RGB gray-scale data is added up, and the output gray level level data and.1 the row (line) adder unit will be used for 1H gray-scale data and add up, and output be used for 1H gray-scale data and.Divider will be used for 1H gray-scale data and divided by 3, and in the gray-scale data removed of output corresponding to the data division of being scheduled to MSB.Counting unit is successively decreased in proper order to the MSB data counts, and exports the number of this countdown.The duty cycle signals generation unit is exported the square wave with predetermined duty cycle according to the number of this countdown.
The square wave output unit also comprises the pixel data converting unit, is used to any one RGB gray-scale data weights assigned.
This LCD comprise a plurality of lines (gate line), a plurality of intersects with the door line and with the data line of door line insulation, and form with matrix shape in door line and the data line area surrounded, the use on-off circuit is connected to the pixel of a line and data line.The method that drives LCD comprises step: (a) order sends sweep signal to the door line; (b) receive RGB gray shade scale signal from outside picture signal source adapting to this gray shade scale signal controlling gamma curves, and export one or more variable grayscale voltages according to the gamma curves of being controlled; And (c) according to should variable grayscale voltage transmission data voltage to data line.
In step (b),, export one or more fixing grayscale voltages according to the gamma curves of being controlled.
Step (b) comprises following substep: (b-1) calculate the mean value that is used for the gray-scale data of 1H from the input of picture signal source, and according to the predetermined duty cycle signals of mean value output that calculates; (b-2) the duty cycle signals analog-converted is control voltage, and exports this control voltage; And (b-3) will to control voltage transformation be the gamma curves with predetermined gamma constant, and export one or more variable grayscale voltages according to the gamma curves of this conversion.
(b-1) step comprises following substep: (b-11) with the addition of RGB gray-scale data; (b-12) will be used for 1H gray-scale data and addition; (b-13) will be used for 1H gray-scale data and divided by 3; (b-14) extract corresponding to the data division of being scheduled to MSB from the gray-scale data of removing, and export the gray-scale data of being extracted; (b-15) order countdown these MSB data, and export the number of this countdown; And the square waves that (b-16) have predetermined duty cycle according to the number output of this countdown.
At step (b-3),, export one or more fixing grayscale voltages according to the gamma curves of being controlled.
Description of drawings
By the detailed description of reference below in conjunction with accompanying drawing, owing to become clear understandable, the present invention and many attendant advantages thereof will be clearer, and wherein identical label is represented identical parts, and among each figure:
Figure 1A to 1C is the figure of explanation as the brightness range variation of the function of gray-scale data;
Fig. 2 is the block scheme according to the LCD of first preferred embodiment of the invention;
Fig. 3 is the block scheme that is used for the screen determining unit of LCD shown in Figure 2;
Fig. 4 is the block scheme that is used for the square wave output unit of screen determining unit shown in Figure 3;
Fig. 5 is the block scheme that is used for the analog-converted unit of screen determining unit shown in Figure 3;
Fig. 6 is the figure of the simulation result of each some dutycycle of time period of explanation;
Fig. 7 is the figure that simulation result shown in Figure 6 is described theoretically;
Fig. 8 is the circuit diagram that is used for the grayscale voltage generation unit of screen determining unit shown in Figure 3;
Fig. 9 is when changing in the scope of voltage at 0-3V that is input to grayscale voltage generation unit shown in Figure 8, based on the simulation result of PSPICE;
Figure 10 is the figure of explanation as the luminance level of the function of gray-scale data;
Figure 11 is the block scheme according to the LCD of second preferred embodiment of the invention;
Figure 12 is the block scheme according to the LCD of third preferred embodiment of the invention; And
Figure 13 represents operation of LCD structure shown in Figure 12.
Embodiment
Below in conjunction with description of drawings the preferred embodiments of the present invention.
Fig. 2 is the block scheme according to the LCD of first preferred embodiment of the invention.
As shown in Figure 2, this LCD comprises picture signal source 100 and LCD module 200.
Specifically, screen intensity determining unit 210 is 100 reception RGB gray shade scale signals from the picture signal source, and detect the degree of the luminance level of each gray shade scale signal with definite screen intensity.Screen intensity determining unit 210 is controlled voltage VIN to grayscale voltage generation unit 220 according to the brightness level output of determining.Output control voltage VIN is proportional to or is inversely proportional to definite brightness level.
Grayscale voltage generation unit 220 receives control voltage VIN, and according to the control voltage VIN control gamma curves that receives.Grayscale voltage generation unit 220 is exported a plurality of grayscale voltages to data-driven unit 240 according to the gamma curves of being controlled.Receive under the control voltage condition that is proportional to brightness level at grayscale voltage generation unit 220, increase positive grayscale voltage with control voltage with being directly proportional, and reduce negative grayscale voltage inversely with control voltage.
Grayscale voltage is set under the situation of γ=2.2 in the display screen of middle gray grade, on than the bright display screen of middle gray grade display screen, export higher control voltage, and gray shade scale generation unit 220 uses the gamma constant control gamma curves greater than 2.2.The lower control voltage of output on the display screen darker than middle gray grade display screen, and gray shade scale generation unit 220 uses the gamma constant control gamma curves less than 2.2.
Data-driven unit 240 receives RGB picture data and data controlling signal from timing control unit 230, and according to the magnitude of voltage that is adapted to reduce by the distance of 1 row from the grayscale voltage of grayscale voltage generation unit 220 each pixel that sends to LCD panel 260.Door driver element 250 is opened the path that is used for sending to each pixel the correction voltage value.
As mentioned above, analyzed from the gray-scale data in picture signal source, thus the brightness level of definite whole screen area, and according to determining that brightness level output is used for the grayscale voltage of LCD module.Like this, can control gamma curves under the display screen state separately, and can not lose any gray-scale data.
Fig. 3 specifically illustrates screen intensity determining unit shown in Figure 2.
As shown in Figure 3, screen intensity determining unit 210 is made of square wave output unit 2110 and analog-converted unit 2120.Screen intensity determining unit 210 receives gray-scale data and determines the brightness level of whole screen area from the external world.The luminance level voltage that 210 outputs of screen intensity determining unit are determined is to grayscale voltage generation unit 220.
Specifically, square wave output unit 2110 is to analog-converted unit 2120 output duty cycle signal Dout, and the dutycycle of this duty cycle signals is proportional with the mean value of the gray-scale data that equals the 1H time that is input to this square wave output unit.
For example, suppose in input white gray level data to surpass under the situation of 1H, export 100% duty cycle signals.Then surpass under the situation of 1H the duty cycle signals of output 50% in input middle gray level data.On the contrary, when input black gray level data surpasses 1H, the duty cycle signals of output 0%.Square wave output unit 2110 can be assemblied in the timing control unit 230, also can constitute separately.
Analog-converted unit 2120 receives duty cycle signals Dout from square wave output unit 2110, and this duty cycle signals of analog-converted, thereby output control voltage VIN is to grayscale voltage generation unit 220.That is to say that analog-converted unit 2120 has the square wave that receives predetermined duty cycle and is converted into the function of the digital-analog convertor of analogue type control voltage.
Fig. 4 specifically illustrates square wave output unit shown in Figure 3.As shown in Figure 4, square wave output unit 2110 comprises pixel data converting unit 111, adder unit 112,1 row adder unit 113, divider 114, counting unit 115 and duty cycle signals generation unit 116.Square wave output unit 2110 is exported predetermined duty cycle signal Dout according to the mean value of the gray-scale data of importing from the external world that is used for the 1H time.
Square wave output unit 2110 can be configured in the timing control unit 230, and output load signal LOAD, sum signal ADDING, row sum signal LINE ADDING, be divided by signal DIV and count signal COUNTING perhaps constitute in independent mode.
For the ease of explaining, suppose input corresponding to 6 Bit datas ' 000000 ' relevant with B pixel grey scale level data with R, and input 6 Bit datas ' 111111 ' relevant with G pixel grey scale level data.
Pixel data converting unit 111 receives the first pixel grey scale level data of R, G and B from the external world, and is that G pixel grey scale level data is distributed predetermined weighting according to the load signal LOAD from timing control unit 230.Pixel data converting unit 111 is duplicated G pixel grey scale level data, is used for R and B pixel grey scale level data, thereby exports the second pixel grey scale level data R ', G ' and B ' to adder unit 112.Output to the second pixel grey scale level data R ', the G ' of adder unit 112 and B ' and be 6 bits ' 111111 ' with G pixel grey scale level data par.
1 row adder unit 113 according to row sum signal LINE ADDING be used for 1 door relevant gray-scale data with the SUM addition, and the output gray level level data with TSUM to divider 114.Under the situation of the resolution of the capable XGA level that is applied to 1024 rgb pixels with door, gray-scale data with TSUM be 18 bits ' 101111010000000000 '.
Counting unit 115 is made of duty cycle register and down counter.Counting unit 115 is fed to duty cycle signals generation unit 116 according to 6 bit MSB with predetermined count value.Specifically, duty cycle register is stored from divider 114 reception 6 bit MSB and to it when receiving load signal LOAD.Down counter sequentially with 6 bit MSB countdown by bit, and is fed to duty cycle signals generation unit 116 with the value of countdown according to count signal COUNTING.
Duty cycle signals generation unit 116 receives countdown value, and output duty cycle signal Dout is to analog-converted unit 120.Surpass under the situation of 1H the duty cycle signals Dout of output 100% in the white data input.Surpass under the situation of 1H the duty cycle signals Dout of output 50% in the input of middle gray level data.On the contrary, when the black data input surpasses 1H, the duty cycle signals Dout of output 0%.
In addition, also can be weighted distribution, perhaps omit by 111 couples of R of pixel data converting unit or G pixel data.
Fig. 5 specifically illustrates analog-converted unit shown in Figure 3.
Shown in Fig. 3 and 5, when first resistance R 11 of the base stage by being connected to the first triode Q11 is received duty cycle signals Dout from 2110 outputs of square wave output unit, output control voltage VIN.
For example, when duty cycle signals Dout was low level, the first triode Q11 turn-offed, and makes voltage charging arrive capacitor C 1.At this moment, charging voltage is AVDD (R
13/ (R
12+ R
13+ R
14)).
And when the duty cycle signals Dout from 2110 outputs of square wave output unit was high level, the first triode Q11 conducting made that the voltage that is charged to capacitor C 1 is discharged.Control voltage VIN as output voltage is determined by the time constant of resistance R 15 and capacitor C 1.That is to say that dutycycle and the umber of pulse wherein of control voltage VIN and duty cycle signals Dout are proportional.
Fig. 6 illustrates the simulation result as each dutycycle of the function of the time cycle relevant with analog-converted unit shown in Figure 5.Each component value of analog-converted unit 2120 is set at R11=20k Ω, R12=1k Ω, R13=1k Ω, R14=1k Ω, R15=20k Ω, and C1=0.1 μ F.Under the situation of AVDD=9V, duty cycle signals Dout is changes between 10%, 30%, 50%, 70% and 90% from initial dutycycle 0% (that is black gray grade).Under these conditions, simulation result obtains by PSPICE.
As shown in Figure 6, after the time cycle of frame 16.6ms, the output VIN of control voltage is converted to and the proportional voltage level of dutycycle.Certainly, this time cycle can change by the time constant of controlling R15 shown in Figure 5 and C1.
Simulation result can be summed up as shown in Figure 7.
As shown in Figure 7, duty cycle signals Dout and the linear ratio of control voltage VIN.That is to say that duty cycle signals Dout has the effect of D/A converter, wherein the D/A converter average gray level data that will be used for display screen is converted to aanalogvoltage.
Fig. 8 is the circuit diagram that specifies grayscale voltage generation unit shown in Figure 3, wherein by liquid crystal application voltage AVDD is carried out dividing potential drop in resistor chain, generates a plurality of grayscale voltages.
As shown in Figure 8, grayscale voltage generation unit 220 comprises first voltage source 2210, second voltage source 2220, first amplifying unit 2230, second amplifying unit 2240, positive grayscale voltage generation unit 2250 and negative grayscale voltage generation unit 2260.
The second voltage VIN that first amplifying unit 2230 amplifies based on the first voltage AVDD is to be fed to first coercive voltage 2231 negative grayscale voltage generation unit 2260.Specifically, first amplifying unit 2230 will be enlarged into VIN (1+R from the control voltage forward of screen intensity determining unit 210 outputs
B/ R
A).At this moment, R
B/ R
ARatio be set at ' 2 ', thereby be maximum 9V with the control voltage amplification of 3V.
Positive grayscale voltage generation unit 2250 comprises resistor chain R21, R22, R23 and R25, is parallel to the resistance R 26 and the R27 of resistor chain, and first diode row D11 and D12.Positive grayscale voltage generation unit 2250 is according to the first voltage AVDD and second coercive voltage 2241, with fixing positive grayscale voltage V
REF1And V
REF5, and a plurality of variable positive grayscale voltage V
REF2, V
REF3And V
REF4Output to the data driver 240 of LCD module 200.In addition, positive grayscale voltage generation unit 2250 output reference center voltage REF-CENTER are to second amplifying unit 2240 and negative grayscale voltage generation unit 2260.The liquid crystal threshold voltage is generated by the voltage drop of first diode row D11 and D12.
Negative grayscale voltage generation unit 2260 comprises second diode row D21 and D22, and linearity is connected to the resistor chain R31 to R35 of second diode row D21 and D22, and the resistance R 36 and the R37 that are parallel-connected to second diode row D21 and D22.Negative grayscale voltage generation unit 2260 is according to the reference center voltage REF-CENTER and first coercive voltage 2231, with fixing negative grayscale voltage V
REF6And V
REF10, and a plurality of variable negative grayscale voltage V
REF7, V
REF8And V
REF9Output to the data-driven unit 240 of LCD module.The liquid crystal threshold voltage is generated by the voltage drop of second diode row D21 and D22.
In common white mode LCD, V
REF1And V
REF10Become all black voltage, and V
REF5And V
REF6Become the whole white grayscale voltage.
As mentioned above, export two fixing positive grayscale voltages and two fixing negative grayscale voltages, and export 3 variable positive grayscale voltages and 3 variable negative grayscale voltages.Selectively, can between the resistor chain of variable positive grayscale voltage of output or variable negative grayscale voltage, a plurality of resistor chains be set further, thus the outer grayscale voltage of amount of exports.For example, at V
REFnAnd V
REFn+1Between the zone by under 16 situations about removing, the gray shade scale that can obtain 64 grades is altogether expressed.
As shown in Figure 9, at positive grayscale voltage V
REF1To V
REF5With negative grayscale voltage V
REF6To V
REF10Gamma curves change according to the electromotive force (potentiality) of input control voltage VIN.
Fig. 9 illustrate when the voltage that is input to grayscale voltage generation unit as shown in Figure 8 when 0V changes between 3V, by the simulation result of PSPICE.
Suppose VIN=1.5V, and γ=2.2.Shown in Fig. 8 and 9, under the situation of VIN＞1.5, the gamma change in voltage is that voltage of white is so that γ＜2.2.Under the situation of VIN＜1.5, the gamma change in voltage is that black voltage is so that γ＞2.2.
As a result, obtain the gamma curves of the level that depends on control voltage VIN as shown in Figure 9.
Figure 10 illustrates the luminance level as the gray-scale data function.The variation of gamma curves degree of tilt is also not serious in the place near low gray-scale data or high gray-scale data, and becomes serious in the place near the middle gray level data.
That is to say, can generate different gamma voltage, determine according to relevant screen state for identical gray-scale data.Therefore, can automatically control gamma curves according to screen state separately, and can not lose any gray-scale data.
As mentioned above, the gamma curves of TFT LCD can automatically be controlled according to the screen intensity degree.Suppose that gamma curves is set at γ=2.2.When screen deflection white level, corresponding gamma becomes γ＞2.2.When screen deflection black-level, corresponding gamma becomes γ＜2.2.
Like this, can make display device, and need not user's manually control one after another with optimization contrast.In addition, no longer may produce any of gray-scale data who is caused by gamma curves control loses.
The gray-scale data of importing from the external world is detected, and controls the degree of tilt of gamma curves automatically according to the gray-scale data that is detected.
Selectively, control data can be imported from the external world with the control gamma curves, and controls the degree of tilt of gamma curves automatically according to the control data of input.
Figure 11 illustrate according to second preferred embodiment of the invention wherein use the analog interface technology LCD.
As shown in figure 11, LCD comprises picture signal source 100 and LCD module 200.Gamma curves according to the control Control of Voltage liquid crystal display of depending on the gamma curves control data.
As mentioned above, relevant with the LCD that adopts the analog interface technology, even the user directly imports the control data that is used to control gamma curves, also can control gamma curves and make it have predetermined gamma constant, and not lose any gray-scale data.
Figure 12 illustrates the LCD that wherein adopts the digital interface technology according to third preferred embodiment of the invention.
As shown in figure 12, this LCD comprises picture signal source 100 and LCD module 200.In the LCD module, control the liquid crystal greyscale coefficient curve according to the gamma curves control data.
N bit gradation coefficient curve control data can be predetermined voltage with different D/A changing of transformations.
Figure 13 illustrates operation of LCD structure shown in Figure 12.
As shown in figure 13, when the gray-scale data of 100 inputs from the picture signal source is 3 bits, they are decoded as 8 grades of gray-scale data by 3-8 demoder 240.Analog switch unit 250 is selected any one according to 8 grades of gray-scale data of being decoded from first to the 8th fixed voltage V1 to V8 of external world's input, and it is outputed to grayscale voltage generation unit 220 as control voltage VIN.
As mentioned above, in the LCD that adopts the digital interface technology,, also can control gamma curves and make it have predetermined gamma constant, and not lose any gray-scale data even the user directly imports the control data that is used to control gamma curves.
In addition, even the user does not have directly input to be used to control the control data of gamma curves, the luminance level of picture gray-scale data is also detected automatically, and will be input to 3-8 demoder 240 as shown in figure 13 based on the duty cycle signals of the luminance level that detects.Then, from first to the 8th fixed voltage V1 to V8 of external world's input, select any one, and it is outputed to grayscale voltage generation unit 220 as control voltage VIN.
As mentioned above, use predetermined gamma constant to control gamma curves automatically, and be adapted to from the gray-scale data of external world's input.Like this, the liquid crystal display that is caused has the display screen of high-contrast, and can not lose any gray-scale data.
In addition, liquid crystal display of the present invention has semi-automatic gamma curves control function, and wherein automatic function is done with manual function and is in the same place.
Although described the present invention in conjunction with the preferred embodiments in detail, it should be appreciated by those skilled in the art, under the situation that does not break away from desired design of the present invention and scope in the claims, can carry out various modifications and replacement to it.
Claims (21)
1. LCD receive RGB gray shade scale signal from the external world, and according to the RGB gray shade scale signal display frame image that receives, described LCD comprises:
LCD MODULE is used to adapt to RGB gray shade scale signal with the control gamma curves, and exports one or more variable grayscale voltages according to the gamma curves of being controlled.
2. LCD as claimed in claim 1, wherein LCD MODULE comprises:
D/A converter is used for the RGB gray-scale data from the numeric type in picture signal source is converted to the gray shade scale signal of analogue type; And
The grayscale voltage generation unit is the gamma curves with predetermined gamma constant with the gray shade scale signal transformation of analogue type, and exports one or more variable grayscale voltages according to this gamma curves.
3. LCD as claimed in claim 1, wherein LCD MODULE comprises:
The grayscale voltage generation unit, being used for the gray shade scale signal transformation from the analogue type in picture signal source is the gamma curves with predetermined gamma constant, and exports one or more variable grayscale voltages according to this gamma curves.
4. LCD as claimed in claim 1, wherein LCD MODULE comprises:
The screen intensity determining unit is used to detect RGB gray-scale data from the picture signal source so that detect the level of screen intensity, and according to the luminance level output control voltage that detects; And
The grayscale voltage generation unit, being used for the control voltage transformation is the gamma curves with predetermined gamma constant, and exports one or more variable grayscale voltages according to this gamma curves.
5. LCD as claimed in claim 4 depends on wherein that according to predetermined gamma constant the conversion that controls voltage to gamma curves is linear or nonlinear.
6. LCD as claimed in claim 5, wherein the conversion with gamma curves places high, medium and low level, and in the level of interaction distance of the center of the gamma curves level of interaction distance more than or equal to fringe region.
7. LCD as claimed in claim 6, wherein, when the luminance level of display screen was higher than the luminance level of middle gray hierarchy level, the gamma constant was greater than the gamma constant relevant with the middle gray hierarchy level; And when the luminance level of display screen was lower than the luminance level of middle gray hierarchy level, the gamma constant was less than the gamma constant relevant with the middle gray hierarchy level.
8. LCD as claimed in claim 4, wherein the screen intensity determining unit comprises:
The square wave output unit is used to calculate the mean value that is used for the gray-scale data of 1H from external world's input, and exports predetermined duty cycle signals according to the mean value of this gray-scale data; And
The analog-converted unit is used for and will be control voltage from the duty cycle signals analog-converted of square wave output unit, and exports this and control voltage to the grayscale voltage generation unit.
9. LCD as claimed in claim 8, wherein the analog-converted unit comprises:
Carry out the triode of switch according to duty cycle signals; And
The charge/discharge unit is used for the switching manipulation charge or discharge liquid crystal application voltage according to triode, and the control voltage of output analog-converted.
10. LCD as claimed in claim 9 is wherein controlled voltage and determined by the RC time constant of charge/discharge unit, and is proportional with the dutycycle and the umber of pulse of duty cycle signals.
11. LCD as claimed in claim 8, wherein the square wave output unit comprises:
Adder unit is used for each RGB gray-scale data is added up, and the output gray level level data and;
1 the row adder unit, be used for be used for 1H gray-scale data and add up, and output be used for 1H gray-scale data and;
Divider, be used for be used for 1H gray-scale data and divided by 3, and in the gray-scale data removed of output corresponding to predetermined MSB data;
Counting unit is used for order and degressively the MSB data is counted, and exports the number of this countdown; And
The duty cycle signals generation unit is used for exporting the square wave with predetermined duty cycle according to the number of this countdown.
12. LCD as claimed in claim 8, wherein the square wave output unit also comprises the pixel data converting unit, is used to any one RGB gray-scale data weights assigned.
13. LCD as claimed in claim 2, wherein the grayscale voltage generation unit comprises:
First amplifying unit is used for amplifying control voltage according to liquid crystal application voltage, with the voltage of exporting this amplification as first coercive voltage;
Second amplifying unit is used for amplifying reference center voltage according to liquid crystal application voltage, with the voltage of exporting this amplification as second coercive voltage;
Positive grayscale voltage generation unit, have a resistor chain and the one or more resistance that are parallel-connected to this resistor chain, described positive grayscale voltage generation unit is exported one or more variable positive grayscale voltages according to the liquid crystal application voltage and second coercive voltage; And
Negative grayscale voltage generation unit, have a resistor chain and the one or more resistance that are parallel-connected to this resistor chain, described negative grayscale voltage generation unit is exported one or more variable negative grayscale voltages according to the reference center voltage and first coercive voltage.
14. LCD as claimed in claim 13, wherein positive grayscale voltage generation unit also comprises the diode row of clamping reference center voltage.
15. LCD as claimed in claim 13, wherein negative grayscale voltage generation unit also comprises the diode row of clamping reference center voltage.
16. LCD as claimed in claim 1, wherein LCD MODULE is adapted to the gray shade scale signal with the control gamma curves, and exports one or more fixing grayscale voltages according to the gamma curves of being controlled.
17. method that drives LCD, this LCD comprises a plurality of lines, a plurality of data line that intersects with the door line and insulate with the door line, and in door line and data line area surrounded, form with matrix shape, each uses on-off circuit to be connected to the pixel of a line and data line, described method comprises the following steps:
(a) order sends sweep signal to the door line;
(b) receive RGB gray shade scale signal from outside picture signal source adapting to this gray shade scale signal controlling gamma curves, and export one or more variable grayscale voltages according to the gamma curves of being controlled; And
(c) send data voltage to data line according to this variable grayscale voltage.
18. method as claimed in claim 17 wherein in step (b), according to the gamma curves of being controlled, is exported one or more fixing grayscale voltages.
19. method as claimed in claim 17, wherein step (b) comprises substep:
(b-1) calculate the mean value that is used for the gray-scale data of 1H from the input of picture signal source, and according to the predetermined duty cycle signals of mean value output that calculates;
(b-2) the duty cycle signals analog-converted is control voltage, and exports this control voltage; And
(b-3) will control voltage transformation is the gamma curves with predetermined gamma constant, and exports one or more variable grayscale voltages according to the gamma curves of this conversion.
20. method as claimed in claim 19, wherein (b-1) step comprises substep:
(b-11) with the addition of RGB gray-scale data;
(b-12) will be used for 1H gray-scale data and addition;
(b-13) will be used for 1H gray-scale data and divided by 3;
(b-14) extract corresponding to the data division of being scheduled to MSB from the gray-scale data of removing, and export the gray-scale data of being extracted;
(b-15) order countdown these MSB data, and export the number of this countdown; And
(b-16) export square wave according to the number of this countdown with predetermined duty cycle.
21. method as claimed in claim 19, wherein step (b-3) comprises substep:
According to the gamma curves of being controlled, export one or more fixing grayscale voltages.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020010030945A KR100796792B1 (en) | 2001-06-02 | 2001-06-02 | Liquid crystal display and driving method thereof |
| KR30945/01 | 2001-06-02 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1389844A true CN1389844A (en) | 2003-01-08 |
| CN100349201C CN100349201C (en) | 2007-11-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB01137120XA Expired - Fee Related CN100349201C (en) | 2001-06-02 | 2001-10-23 | Liquid crystal display device with regulatable gradation coefficient curve |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP5078207B2 (en) |
| KR (1) | KR100796792B1 (en) |
| CN (1) | CN100349201C (en) |
| TW (1) | TW519614B (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| KR100796792B1 (en) | 2008-01-22 |
| JP2002366122A (en) | 2002-12-20 |
| KR20020092075A (en) | 2002-12-11 |
| JP5078207B2 (en) | 2012-11-21 |
| CN100349201C (en) | 2007-11-14 |
| TW519614B (en) | 2003-02-01 |
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