CN1892793A - Apparatus and method of driving liquid crystal display device - Google Patents

Abstract

A driving apparatus and method of an LCD device improves the brightness and the contrast ratio of an image. The driving apparatus includes an LCD panel for displaying an image corresponding to a data signal. A data driver supplies the data signal to the LCD panel. A gate driver supplies a scan signal to the LCD panel. A picture quality improving unit generates a histogram by dividing brightness components of input data into levels, generates data with an extended contrast ratio, and then generates a brightness control signal according to the average value of the histogram. A timing controller supplies reordered data, and controls the data driver and the gate driver. A backlight provides light to the LCD panel. An inverter drives the backlight based on the brightness control signal.

Description

The drive unit of liquid crystal display device and method

The application requires to enjoy the korean patent application No.P2005-58622 that submits on June 30th, 2005 and the right of priority of the P2005-129632 that submits on Dec 26th, 2005, introduces its full content here as a reference.

Technical field

The present invention relates to a kind of liquid crystal display (LCD) device, relate in particular to a kind of drive unit and method that can improve visual brightness and contrast's LCD device.

Background technology

The LCD device comes displayed image by the transmittance according to vision signal control liquid crystal cells.The LCD device can form active array type, and it is included in the switching device in the liquid crystal cells.The LCD device can be used for the display device of computing machine, office instrument, cell phone and other electron device.The switching device that is used for active array type LCD device can be formed by thin film transistor (TFT) (hereinafter referred to as " TFT ").

Fig. 1 is the block diagram of the drive unit of LCD device of the prior art.With reference to Fig. 1, the drive unit of LCD device of the prior art can comprise LCD panel 2, data driver 4, gate driver 6, gamma voltage feeder 8, time schedule controller 10, DC/DC converter 14 and inverter 16.

In LCD panel 2, ' the individual liquid crystal cells of m * n ' (wherein m and n are natural numbers) (Clc) is arranged with matrix type, and a plurality of TFT can form near the infall of grid line and data line.In addition, data driver 4 offers data line (DL1 is to DLm) with data-signal, and gate driver 6 offers grid line (GL1 is to GLn) with sweep signal.In addition, gamma voltage feeder 8 offers data driver 4 with gamma voltage.The synchronizing signal that time schedule controller 10 usefulness systems 20 are provided is come control data driver 4 and gate driver 6.In addition, the voltage that provided of DC/DC converter 14 usefulness power supplys 12 produces the voltage that is used for LCD panel 2.Inverter 16 drives backlight 18.

System 20 offers time schedule controller 10 with level and vertical synchronizing signal (Hsync and Vsync), clock signal (DCLK), data enable signal (DE) and data (R, G, B component of signal).LCD panel 2 can comprise a plurality of liquid crystal cells (Clc) with the infall formation of matrix type layout and contiguous grid line (GL1 is to GLn) and data line (DL1 is to DLm).Be formed at the sweep signal that a plurality of TFT response grid lines (GL) in each liquid crystal cells (Clc) are provided, and the data-signal that data line (DL) is provided offers liquid crystal cells (Clc).In addition, in each liquid crystal cells (Clc), can form holding capacitor (Cst).Holding capacitor (Cst) can form between the pixel electrode of prime grid line and liquid crystal cells (Clc), perhaps can between the pixel electrode of public electrode wire and liquid crystal cells (Clc), form, to remain on the invariable of the interior voltage of liquid crystal cells (Clc).

Gamma voltage feeder 8 offers data driver 4 with a plurality of gamma voltages.The control signal (CS) that data driver 4 response time schedule controllers 10 are provided, convert data (R, G, B component of signal) to simulation gamma voltage (data-signal), and should simulate gamma voltage and offer data line (DL1 is to DLm) corresponding to gray-scale value.In addition, the control signal (CS) that gate driver 6 response time schedule controllers 10 are provided offers grid line (GL1 is to GLn) successively with sweep signal, and select to provide to it horizontal line of data-signal in LCD panel 2.

Time schedule controller 10 utilizes level and vertical synchronizing signal (Hsync and Vsync) and clock signal (DCLK) to produce the control signal (CS) that is used for control gate driver 6 and data driver 4.Here, the control signal (CS) that is used for control gate driver 6 can comprise grid initial pulse (GSP), grid shift clock (GSC) and grid output enable (GOE).In addition, the control signal (CS) that is used for control data driver 4 can comprise source initial pulse (SSP), source shift clock (SSC), source output enable (SOE) and polar signal (POL).The data that time schedule controller 10 is provided system 20 (R, G, B) rearrange, and the data (R, G, B) after then this being rearranged offer data driver 4.

DC/DC converter 14 is by increasing or reducing to produce in order to offer the voltage of LCD panel 2 from the 3.3V that power supply 12 provides.DC/DC converter 14 produces gamma reference voltage, grid high voltage (VGH), grid low-voltage (VGL) and common electric voltage (Vcom).In addition, inverter 16 will be used to drive backlight 18 lamp driving voltage and offer LCD panel 2.Backlight 18 the light of the lamp driving voltage that is provided corresponding to inverter 16 is provided, and the light that is produced is offered LCD panel 2.

In order to obtain image true to nature, be necessary to improve the contrast between dark image and the bright image by the image quality that improves the image that shows in the LCD panel 2 in the above.LCD device for prior art does not have method to improve contrast according to data.In addition, backlight 18 of prior art LCD device does not consider that data send the light of constant intensity, and it is difficult therefore will obtaining image true to nature.For example, when showing the scene of blast, require the brightness of outstanding explosive component.Yet the LCD device of prior art may comprise the backlight 18 of emission constant intensity light, so the LCD device of prior art shows unlifelike image.Therefore, in the LCD device, there is the demand that improves the contrast demonstration.

Summary of the invention

The present invention relates to a kind of drive unit and method of LCD device.

The invention discloses a kind of drive unit and method that can improve visual brightness and contrast's LCD device.

The additional advantage and the feature of this content will partly be set forth in the instructions of back, and concerning those skilled in the art, after reading following content, can partly become clear, perhaps can know after to the practice of this content.

A kind of drive unit of LCD device comprises the LCD panel that is used to show the image corresponding with data-signal.Data driver offers the LCD panel with data-signal.Gate driver offers the LCD panel with sweep signal.Image quality improves the luminance component of unit by first data that will import and is divided into a plurality of ranks and produces histogram, produces the data with enhancing contrast ratio, and based on histogrammic mean value generation brightness control signal.Data after time schedule controller provides and rearranges, and control data driver and gate driver.Backlight light is offered the LCD panel, and inverter this is backlight based on this brightness control signal.

The invention discloses a kind of driving method of the LCD of being used for device, this LCD device has the LCD panel that is used to show the image corresponding with data-signal, be used for the data driver of this data-signal being provided and being used for providing to the LCD panel gate driver of sweep signal to the LCD panel.This method can comprise: produce histogram by the luminance component of dividing first data of input by rank.This method can use histogrammic mean value, based on produce second data by the histogrammic brightness of level other this with enhancing contrast ratio.This method can rearrange second data, and second data after this is rearranged offer this data driver.

The description that is appreciated that aforementioned general description of the present invention and following mask body all is exemplary, and plans to provide as claimed in claim the further explanation to this LCD Apparatus and method for.

Description of drawings

These accompanying drawings provide the further understanding to disclosure, and constitute the part of disclosed content, and they show the example system of disclosure, and are used for explaining this LCD Apparatus and method for together with the description.In the drawings:

Fig. 1 is the block diagram of the drive unit of LCD device of the prior art;

Fig. 2 is the block diagram of the drive unit of LCD device;

Fig. 3 is the block diagram that image quality improves the unit;

Fig. 4 is the block diagram of histogram analysis parts;

Fig. 5 is the histogram step by step that results from the histogram generator;

Fig. 6 is the histogram after modulating step by step;

Fig. 7 is the figure of the luminance component after the modulation;

Fig. 8 illustrates the image photo relatively of image that results from the histogram analysis parts and the method that results from prior art;

Fig. 9 is the block diagram of histogram analysis parts;

Figure 10 is the histogram step by step that results from the histogram generator;

Figure 11 is the histogram by other modulation of level;

Figure 12 is the figure of the luminance component after the modulation;

Figure 13 illustrates image that is produced by the histogram analysis parts and the image that adopts art methods to produce photo relatively;

Figure 14 is the block diagram that is used to illustrate the histogram analysis parts;

Figure 15 is the figure that is used for being illustrated in the dynamic backlight yield value that gain controller backlight produces;

Figure 16 A illustrates the data-modulated of the bright image that passes through the data-modulated unit that comprises the histogram analysis parts to 16E;

Figure 17 A illustrates the data-modulated of the dark image that passes through the data-modulated unit that comprises the histogram analysis parts to 17E;

Figure 18 is the block diagram of the drive unit of LCD device; And

Figure 19 is the block diagram that image quality improves the unit.

Embodiment

Now disclosure is carried out detailed discussion, its example is shown in the drawings.Identical as far as possible reference number is represented identical or similar parts in whole figure.

Fig. 2 is the block diagram of the drive unit of LCD device.As shown in Figure 2, the drive unit of this LCD device comprises that LCD panel 22, data driver 24, gate driver 26, image quality improve unit 42, time schedule controller 30, backlight 38 and inverter 36.

LCD panel 22 can comprise a plurality of thin film transistor (TFT) TFT (wherein m and n are natural numbers) of contiguous n bar grid line (GL1 is to GLn) and m bar data line (DL1 is to DLm) infall.Data driver 24 offers data line (DL1 is to DLm) with data-signal, and gate driver 26 offers grid line (GL1 is to GLn) with sweep signal.Image quality raising unit 42 can be divided into a plurality of ranks by the luminance component that will import first data (Ri, Gi and Bi component of signal) and produce histogram.Image quality improves unit 42 by using for example histogrammic mean value of this histogrammic calculated value, intermediate value, mode, skewness, kurtosis or other numerical value or statistical property, and other brightness produces second data (Ro, Go and Bo component of signal) with enhancing contrast ratio based on each grade in this histogram.Image quality improves unit 42 and produces brightness control signal (Dim) based on histogrammic calculated value.Time schedule controller 30 rearranges second data (Ro, Go and Bo) for making it to be suitable for driving LCD panel 22, and second data after this arrangement are offered data driver 24 and control data driver 24 and gate driver 26.Backlight 38 is luminous to LCD panel 22, and inverter 36 drives backlight 38 according to brightness control signal (Dim).

The drive unit of LCD device can comprise for example such system 40, gamma voltage feeder 28, power supply 32 and the DC/DC converter 34 of external source.System 40 can produce first data (Ri, Gi and Bi), first level and vertical synchronizing signal (Hsync1 and Vsync1), first clock signal (DCLK1), first data enable signal (DE1) and driving electric (Vin).Gamma voltage feeder 28 can produce a plurality of benchmark gamma voltages with different value, and the benchmark gamma voltage that produces is offered data driver 24.Power supply 32 can produce the driving voltage that is used for time schedule controller 30, gamma voltage feeder 28, data driver 24 and gate driver 26 by using driving electric (Vin).DC/DC converter 34 can produce the voltage that is supplied to LCD panel 22 by the voltage that uses power supply 32 to be provided.

System 40 offers image quality raising unit 42 with first level and vertical synchronizing signal (Hsync1 and Vsync1), first clock signal (DCLK1), first data enable signal (DE1) and first data (Ri, Gi and Bi).System 40 provides from the driving electric (Vin) of outside input to power supply 32.DC/DC converter 34 produces the voltage that offers LCD panel 22 by increasing or reducing from the 3.3V of power supply 32 inputs.DC/DC converter 34 produces gamma reference voltage, grid high voltage (VGH), grid low-voltage (VGL) and common electric voltage (Vcom).

LCD panel 22 can comprise a plurality of liquid crystal cells (Clc) with the infall formation of matrix type layout and contiguous grid line (GL1 is to GLn) and data line (DL1 is to DLm) (wherein m and n are natural numbers).The a plurality of TFT that are formed in each liquid crystal cells (Clc) can respond the sweep signal that grid line (GL) is provided, and the data-signal that data line (DL) is provided offers liquid crystal cells (Clc).Holding capacitor (Cst) can form in each liquid crystal cells (Clc).Holding capacitor (Cst) can be formed between the pixel electrode of prime grid line and liquid crystal cells (Clc), perhaps can be formed between the pixel electrode of public electrode wire and liquid crystal cells (Clc), to keep the interior voltage constant of liquid crystal cells (Clc) constant.

The driving voltage that gamma voltage feeder 28 uses power supply 32 to be provided produces the benchmark gamma voltage with different value, and the benchmark gamma voltage that is produced is offered data driver 24.

Image quality improves unit 42 and is divided into a plurality of ranks according to first level and vertical synchronizing signal (Hsync1 and Vsync1), first clock signal (DCLK1) and first data enable signal (DE1) luminance component by first data (Ri, Gi and Bi) that will import and produces histogram.In addition, image quality improves unit 42 by using for example mean value of this histogrammic calculated value, other brightness produces second data (Ro, Go and Bo component of signal) with enhancing contrast ratio based on this each grade of histogram, and second data that will produce (Ro, Go and Bo) offer time schedule controller 30.Image quality improves unit 42 and produces brightness control signal (Dim) based on histogrammic calculated value, and the brightness control signal (Dim) that produces is offered inverter 36.Image quality improves unit 42 and produces second level and vertical synchronizing signal (Hsync2 and Vsync2), second clock signal (DCLK2) and second data enable signal (DE2) synchronous with second data (Ro, Go and Bo), and second level and vertical synchronizing signal (Hsync2 and Vsync2), second clock signal (DCLK2) and second data enable signal (DE2) are offered time schedule controller 30.

Time schedule controller 30 can improve second level of unit 42 inputs and vertical synchronizing signal (Hsync2 and Vsync2) and second clock signal (DCLK2) from image quality and produces the control signal (CS) that is used for control gate driver 26 and data driver 24 by using.Time schedule controller 30 is arranged second data (Ro, Go and Bo) and is made it to be suitable for driving LCD panel 22, and second data that will arrange offer data driver 24.The control signal (CS) that is used for control gate driver 26 comprises grid initial pulse (GSP), grid shift clock (GSC) and grid output enable (GOE).In addition, the control signal (CS) that is used for control data driver 24 comprises source initial pulse (SSP), source shift clock (SSC), source output enable (SOE) and polar signal (POL).

The control signal (CS) that data driver 24 response time schedule controllers 30 are supplied with, the gray-scale value of second data (Ro, Go and Bo) that provided according to time schedule controller 30 selects one of them as data-signal from these a plurality of gamma voltages, and the selected data signal is offered data line (DL1 is to DLm).The control signal (CS) that gate driver 26 response time schedule controllers 30 are supplied with, and select to be applied with on it a horizontal line in LCD panel 22 of data line signal by sweep signal being offered grid line (GL1 is to GLn).Gate driver 26 can offer grid line successively with sweep signal.

Inverter 36 improves brightness control signal (Dim) the control lamp driving electric (perhaps AC waveform) that unit 42 is provided according to image quality, and the lamp driving electric is offered backlight 38.Backlight 38 can produce light based on the lamp driving electric that inverter 36 is provided, and the illumination that produces are mapped to the rear surface of LCD panel 22.Backlight 38 can form peripheral type or full run-down type.For the peripheral type back light unit, be light source to be located at be used for the side of photoconduction to the light guide plate of LCD panel 22, light shines LCD panel 22 by light guide plate.For the Staight downward type backlight unit, be the rear surface that a plurality of light sources is located at LCD panel 22, LCD panel 22 is by the light direct irradiation of these a plurality of light sources generations like this.

Fig. 3 is the block diagram that image quality shown in Figure 2 improves unit 42.As shown in Figure 3, image quality raising unit 42 can comprise data-modulated module 70, backlight controller 72 and control module 68.Data-modulated module 70 is divided into a plurality of ranks generation histograms by the luminance component of first data (Ri, Gi and Bi) that will import according to first level that provides from system 40 and vertical synchronizing signal (Hsync1 and Vsync1), first clock signal (DCLK1) and first data enable signal (DE1).Data-modulated module 70 can by use this histogrammic calculated value for example mean value produce based on other brightness of this each grade of histogram and have second data (Ro, Go and Bo component of signal) of enhancing contrast ratio, and second data can be offered time schedule controller 30.Backlight controller 72 produces brightness control signal (Dim) based on histogrammic calculated value.Control module 68 produces second level and vertical synchronizing signal (Hsync2 and Vsync2), second clock signal (DCLK2) and second data enable signal (DE2) synchronous with second data (Ro, Go and Bo).

Data-modulated module 70 can comprise luminance/chrominance separation parts 50, delay unit 52, brightness/chroma hydrid component 54, histogram analysis parts 56 and histogram modulating part 58.Luminance/chrominance separation parts 50 are divided into luminance component (Y) and colourity-color difference components (U and V) with first data (Ri, Gi and Bi).Luminance component (Y) and colourity-color difference components (U and V) can be represented to 3 with following equation 1.

Y=0.229 * Ri+0.587 * Gi+0.114 * Bi [equation 1]

U=0.493 * (Bi-Y) [equation 2]

V=0.887 * (Ri-Y) [equation 3]

Luminance/chrominance separation parts 50 will offer histogram analysis parts 56 from the luminance component (Y) that first data (Ri, Gi and Bi) draws, and will offer delay unit 52 from colourity-color difference components (U and V) that first data (Ri, Gi and Bi) tells.

Histogram analysis parts 56 can be divided at least 16 ranks by the luminance component (Y) of unit frame that luminance/chrominance separation parts 50 are provided and come compute histograms, produce for example mean value of calculated value, and press the grade setting slope with reference to the mean value that produces.Histogram analysis parts 56 also can be provided with each slope by rank.

Fig. 4 is the block diagram of histogram analysis parts 56.As shown in Figure 4, histogram analysis parts 56 can comprise that histogram generator 150, mean value generator 152, frequency generator 154, rank weight are provided with device 156 and the rank slope is provided with device 158.

Histogram generator 150 is set at least 16 ranks with the luminance component (Y) that luminance/chrominance separation parts 50 are provided, and produces histogram (the Hist_i, ' i ' from 1 to 16 of unit frame shown in Figure 5).Histogram generator 150 is by rank integrated brightness component (Y), to produce by level other histogram (Hist_i).Histogram generator 150 reads the monochrome information of first data (Ri, Gi and Bi).In the histogram of Fig. 5, for example, event histogram (Hist_i) concentrates on right side (high-level), and it can represent bright image so.Event histogram (Hist_i) concentrates on the left side, and it can represent dark image so.

Histogram generator 150 can be divided into 8 ranks by the luminance component (Y) that luminance/chrominance separation parts 50 are provided or 32 ranks produce histogram (Hist_i).Event histogram generator 150 be by being divided into 16 ranks corresponding to the luminance component (Y) of first data (Ri, Gi and Bi) of 8 (bit), so histogram generator 150 be by 16 gray shade scale units also promptly in 256/16 integrated brightness component (Y) produce 16 other histograms of level (Hist_i).

Mean value generator 152 multiply by histogram (Hist-i) with each histogram rank, with the multiplied result addition, then with the total value of addition divided by total histogram number, produce mean value (M) thus, also, $\frac{\underset{p=1}{\overset{i}{\mathrm{\Σ}}}(P\×\mathrm{Hist}\_p)}{\underset{p=1}{\overset{i}{\mathrm{\Σ}}}\mathrm{Hist}\_p}.$ According to pressing level other histogram (Hist_i) and reference average (M), frequency generator 154 produces the histogram number (LH) of the accumulation of the first area littler than mean value (M), the histogram number (HH) of the accumulation of the second area that generation is bigger than mean value (M), and produce at these ranks for example at the histogram number (Histc_i) of other accumulation of each grade.

The rank weight is provided with the histogram number (HH) of the accumulation of histogram number (LH) that device 156 utilizes the accumulation of mean value (M), first area, second area, at these other histogram numbers (Histc_i) of level, adjacent histogram rank (Hsize) and weight backlight (BLW), the weight (Scoe1_j and Scoe2_k) of first area and second area can be set according to rank, and the luminance weights (Hcoe_k) of second area can be set according to rank, and they are represented with following equation 4 and 5.Weight backlight (BLW) can be made as for example constant between 1 and 2, so that the ratio between minimum brightness and the high-high brightness is compensated.

Scoe1_j=(M-1) * (Histc_i/LH) [equation 4]

Scoe2_k＝(Hsize-M)×(Histc_i/HH)

Hcoe_k=(Hsize-BLW * M)/(Hsize-M) [equation 5]

In the superincumbent equation 4 and 5, ' j ' corresponding to first to M rank, ' k ' corresponding to M to ' i ' rank, wherein the M rank is corresponding to histogrammic mean value (M).

The rank slope is provided with device 158 and can utilizes the minimum slope value (Smin), weight backlight (BLW), the second area that are provided with from external source by other weight of level (Scoe1_j and Scoe2_k) histogrammic rank to be provided with slope (Slope_i) by level other luminance weights (Hcoe_k) and first and second zones.Minimum slope value (Smin) can be made as for example constant between 0 to 1, to prevent to strengthen because of the extreme of histogram rank contrast the distortion of the raw image that causes.

The rank slope is provided with device 158 and can utilizes minimum slope value (Smin), weight backlight (BLW) and first area by other weight of level (Scoe1_j) histogram slope (Slope_1 is to Slope_M) to be set, shown in following equation 6.

Slope_j=BLW * (Scoe1_j * (1-Smin)+Smin) [equation 6]

The rank slope is provided with device 158 according to weight backlight (BLW) setting other slope of histogram level (Slope_M) based on mean value (M), shown in following equation 7.

Slope_M=BLW [equation 7]

The rank slope be provided with device 158 utilize minimum slope value (Smin), second area by level other weight (Scoe2_k) and second area by level other luminance weights (Hcoe_k), at rank histogram slope (Slope_M+1 is to Slope_i) is set greater than the second area of mean value (M).

Slope_k=Hcoe_k * (Scoe2_k * (1-Smin)+Smin) [equation 8]

The rank slope be provided with device 158 be provided with from 1 to ' other histogrammic slope of i ' level, for example from 1 to 16 rank offers histogram modulating part 58 with this slope then.

The mean value (M) that histogram analysis parts 56 can be produced mean value generator 152 offers backlight control module 72.Histogram analysis parts 56 produce mean value (M) by extract 16 other histograms of level (Hist_i) from the luminance component (Y) of a frame.Then, histogram analysis parts 56 are provided with slope (Slope_1 is to Slope_16) based on this mean value (M) for histogrammic each rank, and this slope is offered histogram modulating part 58.

Histogram modulating part 58 produces at the luminance component (YM_i) after other modulation of these grades, as shown in Figure 6 with enhancing contrast ratio by the luminance component (Y) of modulated luminance/Fig. 5 that chrominance separation parts 50 are provided.Histogram modulating part 58 uses at these level other slopes (Slope_1 is to Slope_16) of histogram, current histogram rank (X_i), previous histogram (Xoffset) and previous other histogram number (Yoffset) of level, shown in following equation 9.

YM_i=Slope_i (X_i-Xoffset)+Yoffset [equation 9]

Histogram modulating part 58 can comprise register, and its each other histogram number (Histc_i) of level that is used for the frequency generator 154 by these histogram analysis parts 56 of interim storage and is provided provides current histogram rank (X_i), previous histogram rank (Xoffset) and previous other histogram number (Yoffset) of level.Histogram modulating part 58 deducts previous histogram rank (Xoffset) from the current histogram rank (X_i) that this register provided, this result be multiply by slope (Slope_i) corresponding to current histogram rank (X_i), then this result is added on previous other histogram number (Yoffset) of level, carry out so successively, just produced other luminance component of modulating (YM_i) of each grade.As shown in Figure 7, the gray shade scale of the luminance component of this modulation (YM) can be distributed in all zones, therefore just may improve the contrast between dark image and the bright image.

When in histogram analysis parts 56 and histogram modulating part 58 to luminance component (Y) when analyzing, delay unit 52 postpones colourity-color difference components (U and V), to produce the colourity-color difference components (UD and VD) that postpones.Delay unit 52 is synchronous in the luminance component (YM) of modulation, and delay unit 52 offers brightness/chroma hydrid component 54 with the colourity-color difference components (UD and VD) that postpones.Brightness/chroma hydrid component 54 uses the luminance component (Ym) of modulation and the colourity-color difference components (UD and VD) of delay to produce second data (Ro, Go and Bo).Second data (Ro, Go and Bo) obtain to 12 by following equation 10.

Ro=YM+0.000 * UD+1.140 * VD [equation 10]

Go=YM-0.396 * UD-0.581 * VD [equation 11]

Bo=YM+2.209 * UD+0.000 * VD [equation 12]

The operation of data-modulated module 70 as described.

Luminance/chrominance separation parts 50 use equation 1 to 3 that first data (Ri, Gi and Bi) are divided into luminance component (Y) and colourity-color difference components (U and V).Luminance component (Y) can be passed in the histogram analysis parts 56, and colourity-color difference components (U and V) can be passed in the delay unit 52.

The luminance component (Y) of histogram analysis parts 56 by unit frame that luminance/chrominance separation parts 50 are provided is divided at least 16 ranks and extracts histogram (Hist_i).Histogram analysis parts 56 produce mean value (M) and with reference to the mean value (M) that produces these ranks are provided with slope (Slope_1 is to Slope_16).Histogram analysis parts 56 offer histogram modulating part 58 with each other slope of level (Slope_1 is to Slope_16), and the mean value (M) that produces is offered backlight control module 72.

Histogram modulating part 58 component (Y) that highlights is distributed to whole gray level region according to each other slope of level (Slope_1 is to Slope_16) of from 1 to 16 with luminance component (Y) to adopt equation 9.Thus, the luminance component (YM) after the 58 generation modulation of histogram modulating part.Luminance component (YM) after histogram modulating part 58 will be modulated offers brightness/chroma hydrid component 54.

By using equation 10 to 12, luminance component (YM) generation second data (Ro, Go and Bo) of brightness/chroma hydrid component 54 and after modulating based on the colourity-color difference components (UD and VD) that postpones.Because second data (Ro, Go and Bo) are to be produced by the luminance component (YM) after the modulation, therefore second data (Ro, Go and Bo) can have clearer contrast.Luminance component (YM) is distributed in basically on the whole gray level region, has second data (Ro, Go and Bo) of clearer brightness and darkness, so just can on LCD panel 22, show picture image true to nature with generation.It is brighter that bright color can become, and dark color can become darker, thereby can improve contrast.

Meanwhile, the relevant brightness control signal (Dim) of mean value (M) that is provided with histogram analysis parts 56 is provided backlight control module 72, and the brightness control signal (Dim) that produces is offered inverter 36.Backlight control module 72 comprises backlight control parts 60 and digital-to-analog converting member 62.

Backlight control parts 60 produce brightness control signal (Dim), and this signal is relevant with the mean value (M) that histogram analysis parts 56 are provided.If mean value (M) has the value of the brightness that expression is the brightest, backlight control parts 60 produce the brightness control signal (Dim) in order to the light that produces brightness so.Yet if mean value (M) has the value of an expression minimum brightness, backlight control parts 60 produce the brightness control signal (Dim) in order to the light of generation minimum brightness so.Digital-to-analog converting member 62 can be converted to analog control signal with brightness control signal (Dim), and this analog control signal is offered inverter 36.

Inverter 36 will offer backlight 38 based on the lamp driving electric of brightness control signal (Dim).The light of the brightness that 38 generations backlight are corresponding with the lamp driving electric that inverter 36 is provided, and the light that will produce offers LCD panel 22.Backlight control parts 60 are based on the light of controlling from the mean value (M) of histogram analysis parts 56 from backlight 38.On LCD panel 22, bright color can show brightlyer, and dark color can show secretlyer.This can allow picture image to be presented on the LCD panel 22 with higher contrast.

Control module 68 receives first vertical and horizontal-drive signal (Vsync1 and Hsync1), first clock signal (DCLK1) and first data enable signal (DE1) from system 40.In addition, control module 68 produces second vertical and horizontal-drive signal (Vsync2 and Hsync2), second clock signal (DCLK2) and second data enable signal (DE2) synchronous with second data (Ro, Go and Bo), and with second vertically and horizontal-drive signal (Vsync2 and Hsync2), second clock signal (DCLK2) and second data enable signal (DE2) offer time schedule controller 30.

In the drive unit and method of superincumbent LCD device, second data (Ro, Go and Bo) can utilize the mean value (M) of reference histogram and be provided with and be used for that other slope of this grade produces, this histogrammic mean value is that the luminance component (Y) from first data (Ri, Gi and Bi) extracts.The LCD device can show picture image dynamic and true to nature.Can make bright part brighter like this based on the brilliance control of a frame picture from 38 light that sent backlight, and make the dark part can be darker.

Fig. 8 illustrates the application of this method, and wherein sky can show brightlyer, and the mountain range can show secretlyer.Contrast can improve with mean flow rate.Reduce from the brightness of 38 the backlight light that send and offer LCD panel 22 mean value (M) because of bright and dark position.Adjust backlight 38 tube current (tube current), to reduce backlight 38 power consumption.

Fig. 9 is the block diagram of histogram analysis parts 56.As shown in Figure 9, histogram analysis parts 56 can comprise that histogram generator 150, mean value generator 152, frequency generator 154, rank weight are provided with device 156, device 157 is set minimum slope and the rank slope is provided with device 158.

Except that minimum slope is provided with device 157 and the rank slope is provided with the device 158, histogram analysis parts 56 shown in Figure 9 structurally can be with shown in Figure 4 the same.Thereby, except minimum slope is provided with device 157 and the rank slope is provided with the device 158, can replace concrete explanation at the description of Fig. 4 above at other structure.

The intermediate value (Histm) of histogram analysis parts 56 number of levels (Histt) by using number of levels (Histt) from the minimum slope value (Smin) of external source input and histogram (Hist_i), histogram (Hist_i) and the mean value (M) of histogram (Hist_i), histogrammic mean value (M) wherein is provided with minimum slope value (Slmin) than the low low area of these level other intermediate values (Histm), the high zone that wherein mean value (M) is higher than intermediate value (Histm) is provided with minimum slope value (Shmin).Then, histogram analysis parts 56 are provided with device 158 to the rank slope minimum slope value (Slmin) at this low area are provided, and at the minimum slope value (Shmin) in this height zone.The minimum slope value (Smin) of outside input is defined as a for example constant between 0 and 1, to prevent strengthening the pattern distortion that causes because of the extreme of the contrast in the histogram rank.

The intermediate value (Histm) of the number of levels (Histt) of event histogram (Hist_i) is identical or littler than it with the mean value (M) of histogram (Hist_i), minimum slope is provided with device 157 equation 13 below utilizing so, according to number of levels (Histt), intermediate value (Histm), mean value (M) and minimum slope value (Smin) minimum slope value (Slmin) at this low area is set.The mean value (M) of event histogram (Hist_i) be positioned at first to ' between the individual histogram rank of n/2 ' (Hist_i is to Hist_i/2), minimum slope is provided with the minimum slope value (Slmin) of device 157 settings at this low area so.

Slmin=1-(Histt-Histm)/(Histm-1) * (1-Smin) [equation 13]

The intermediate value (Histm) of the number of levels (Histt) of event histogram (Hist_i) is greater than the mean value (M) of histogram (Hist_i), minimum slope is provided with device 157 and utilizes following equation 14 so, is provided with at high regional minimum slope value (Shmin) according to number of levels (Histt), intermediate value (Histm) and minimum slope value (Smin).Also promptly, the mean value (M) of event histogram (Hist_i) is positioned at ' n/2+1 ' and ' between the individual histogram rank of n ' (Hist_i/2+1 is to Hist_i), and minimum slope is provided with the minimum slope value (Shmin) that device 157 is provided with at this height zone so.Minimum slope is provided with device 157 and according to the intermediate value (Histm) of the number of levels (Histt) of histogrammic mean value (M) and reference histogram (Hist_i) minimum slope value (Slmin and Shmin) at low area and high zone is set, to keep the brightness of image.

Shmin=1-(1-Smin) * (Histm-1)/(Histt-Histm) [equation 14]

The rank slope is provided with device 158 utilizations and from low area and high regional minimum slope value (Slmin and Shmin), weight backlight (BLW), each grade other luminance weights (Hcoe_k) of second area, each other first and second weight of level (Scoe1_j and Scoe2_k) that minimum slope is provided with device 157 inputs histogrammic each level other slope (slope_i) is set.The rank slope be provided with device 158 utilize the minimum slope value (Slmin) of low area, weight backlight (BLW) and first area each the level other weight (Scoe1_j) be provided with the first area lower than mean value (M) each the level other slope (Slope_1 is to Slope_M), shown in following equation 15.

Slope_j=BLW * (Scoe1_j * (1-Slmin)+Slmin) [equation 15]

In addition, the rank slope is provided with device 158 and according to weight backlight (BLW) slope (Slope_M) of mean value (M) is set, shown in following equation 16.

Slope_M=BLW [equation 16]

Other luminance weights of level (Hcoe_k) that the rank slope is provided with level other weight (Scoe2_k) of minimum slope value (Shmin) that device 158 utilizes high zone, second area and second area is provided with level other slope (Slope_M+1 is to Slope_i) of the second area higher than mean value (M), shown in following equation 17.

Slope_k=Hcoe_k * (Scoe2_k * (1-Shmin)+Shmin) [equation 17]

The rank slope be provided with 158 pairs of devices from histogrammic 1 to ' i ' for example 1 to 16 rank slope (Slope_1 is to Slope_16) is set, then histogrammic these other slopes of level are offered histogram modulating part 58.

Histogrammic these level other slopes (Slope_1 is to Slope_16), current histogram rank (X_i), last histogram rank (Xoffset) and other histogram number (Yoffset) of previous stage that histogram modulating part 58 uses histogram analysis parts 56 to be provided, the luminance component (Y) that luminance/chrominance separation parts 50 are provided, represented and shown in Figure 10 as top equation 9, be modulated to other luminance component step by step (YM_i) after the modulation.Here, the luminance component after this modulation (YM) is distributed in whole zone, as shown in figure 12, has so just improved the contrast with this mean flow rate.

In the drive unit and method of these histogram analysis parts 56 of sampling, histogrammic mean value (M) is to obtain by extract a plurality of other histograms of level from the luminance component (Y) of first data (Ri, Gi and Bi), and these other slopes of level are by being provided with according to the minimum slope value (Slmin and Shmin) of histogrammic mean value (M) based on these other intermediate value of histogram level (rank) control low areas and high zone.Thereby this drive unit of this LCD device and method can show image dynamic and true to nature with luminance contrast clearly.From backlight 38 light that send, bright thus part becomes brighter according to the brilliance control of the picture of a frame, and dark part becomes darker.

Figure 13 illustrates the drive unit among Fig. 9 and the application of method.Sky can show brightlyer, and the mountain range can show secretlyer, and contrast can improve with mean flow rate like this.Can reduce because of the mean value (M) at bright and dark position from 38 the backlight brightness of sending and offer the light of LCD panel 22.Adjust backlight 38 tube current (tube current), reduced backlight 38 power consumption thus.

Figure 14 is the block diagram of histogram analysis parts 56.As shown in figure 14, histogram analysis parts 56 can comprise that histogram generator 150, mean value generator 152, frequency generator 154, gain controller backlight 155, rank weight are provided with device 156, device 157 is set minimum slope and the rank slope is provided with device 158.Histogram generator 150 shown in Figure 14 and mean value generator 152 structurally can be identical with shown in Figure 4 those, saved the explanation for histogram generator 150 and mean value generator 152 shown in Figure 14 thus.

Gain controller 155 backlight uses the total number of levels (Histt) by user's setting and the weight backlight (BLW) that provides, histogrammic mean value (M) and histogram (Hist_i) to produce yield value backlight (nBLW).Here, weight backlight (BLW) is made as a for example constant of 1 to 2, this constant is from the external source input, to compensate according to the ratio of first data (Ri, Gi and Bi) to minimum brightness and high-high brightness.Represented as following equation 18, gain controller 155 backlight deducts ' 1 ' from weight backlight (BLW), then with this result divided by histogrammic total number of levels (Histt), to multiply by histogrammic mean value (M) with its result's negative value then, then weight backlight (BLW) is added on this result, produces yield value backlight (nBLW) like this.

$\mathrm{nBLW}=-\left(\frac{\mathrm{BLW}-1}{\mathrm{Histt}}\right)\×M+\mathrm{BLW}$ [equation 18]

Thereby, as shown in figure 15, gain controller 155 backlight produces the yield value backlight (nBLW) of that corresponding with this histogrammic total number of levels (Histt) from having the gain diagram backlight (A) that is arranged in the slope between weight backlight (BLW) and this histogrammic mean value (M).Gain controller 155 backlight produces dynamic backlight yield value (nBLW), passes through the gain of backlight control image thus.It can prevent the saturated of image by the gain backlight of controlling bright image and the brightness that keeps dark image.

Frequency generator 154 according to for a plurality of other histograms of level (Hist_i) based on histogrammic mean value (M), produces the accumulation histogram number (LH) of the first area lower, accumulation histogram number (HH) and other histogram number (Histc_i) of each grade of the second area higher than histogrammic mean value (M) than histogrammic mean value (M).

The rank weight is provided with each level other weight (Scoel_j) that device 156 uses accumulation histogram number (LH) the generation first area of histogrammic mean value (M), these other histogram numbers (Histc_i) of level and first area, and is represented as top equation 4.In addition, the rank weight is provided with these level other weights (Scoe2_k) of each accumulation histogram number (LH and HH), adjacent histogram rank (Hsize) and yield value backlight (nBLW) the generation second area of device 156 use histogrammic mean values (M), each other histogram number (Histc_i) of level and first area and second area, shown in following equation 19.

Scoe2_k＝(Hsize-M)×(Histc_i/HH)

Hcoe_k=(Hsize-nBLW * M)/(Hsize-M) [equation 19]

In the superincumbent equation 19, ' k ' is corresponding to M to 32 rank.

Minimum slope be provided with device 157 be provided with wherein histogrammic mean values (M) be lower than these other intermediate values of level (Histm) low area minimum slope value (Slmin) and the minimum slope value (Shmin) that wherein histogrammic mean value (M) is higher than the high zone of these other intermediate values of level (Histm) is set.Then, minimum slope is provided with device 157 and minimum slope value (Slmin and Shmin) is offered the rank slope device 158 is set.Because minimum slope is provided with device 157 structurally with shown in Figure 9 identical, therefore saves the concrete explanation that minimum slope is provided with device 157.

The rank slope is provided with device 158 uses and from low area and high regional minimum slope value (Slmin and Shmin), yield value backlight (nBLW), these grades other luminance weights (Hcoe_k) of second area and these other weights of level (Scoe1_j and Scoe2_k) in first and second zones that minimum slope is provided with device 157 inputs histogrammic these level other slopes (Slope_i) is set.Particularly, the rank slope is provided with these level other slopes (Slope_1 is to Slope_M) that these other weights of level (Scoe1_j) that device 158 uses minimum slope value (Slmin), yield value backlight (nBLW) and the first area of low areas are provided with the first area littler than mean value (M).

Slope_j=nBLW * (Scoe1_j * (1-Slmin)+Slmin) [equation 20]

The rank slope is provided with device 158 and according to yield value backlight (nBLW) slope (Slope_M) of mean value (M) is set, and is represented as following equation 21.

Slope_M=nBLW [equation 21]

These other luminance weights of level (Hcoe_k) that the rank slope is provided with each level other weight (Scoe2_k) of minimum slope value (Slmin) that device 158 uses high zone, second area and second area are provided with these level other slopes (Slope_M+1 is to Slope_i) of the second area higher than mean value (M), and are represented as top equation 17.In addition, the rank slope is provided with device 158 from 1 to 32 other histogrammic slope (Slope_1 is to Slope_16) of level is set, and then these other histogrammic slopes of level is offered histogram modulating part 58.

The rank slope is provided with device 158 can use low area and the high regional minimum slope value (Slmin and Shmin) that replaces being provided with from minimum slope device 157 inputs from the minimum slope value (Smin) of external source input.For this reason, the rank slope is provided with device 158 and uses these level other luminance weights (Hcoe_k) of minimum slope values (Smin), yield value backlight (nBLW), second area and these other weights of level (Sceo1_j and Scoe2_k) in first and second zones that histogrammic each level other slope (Slope_i) is set.Minimum slope value (Smin) can be made as the constant between 0 to 1, to prevent to strengthen the distortion of the raw image that causes because of the extreme of contrast in the histogram rank.

The rank slope is provided with these other histogram slopes (Slope_1 is to Slope_M) of level that these other weights of level (Sceo1_j) that device 158 uses minimum slope value (Smin), yield value backlight (nBLW) and first areas are provided with the first area littler than mean value (M), and is represented as following equation 22.

Slope_j=nBLW * (Scoe1_j * (1-Smin)+Smin) [equation 22]

The rank slope is provided with device 158 and according to yield value backlight (nBLW) other slope of histogram level (Slope_M) with mean value (M) is set, shown in top equation 21.The rank slope is provided with these level other slopes (Slope_M+1 is to Slope_i) that these other luminance weights of level (Hcoe_k) that device 158 uses each level other weight (Sceo2_k) of minimum slope values (Shmin), second area and second area are provided with the second area higher than mean value (M), shown in top equation 8.The rank slope is provided with device 158 from 1 to 32 other slope of level of histogram (Slope_1 is to Slope_32) is set, and this slope is offered histogram modulating part 58.Data-modulated module 70 can comprise histogram analysis parts 56, keeping the brightness of dark image, and controls the gain in bright image backlight, prevents the saturated of image thus.

The following describes the modulation treatment of the bright image in the data-modulated module 70.

Shown in Figure 16 A, according to equation 1 to 3, the data of bright image are divided into luminance component (Y) and colourity-color difference components (U and V).Then, shown in Figure 16 B, luminance component (Y) is divided into 32 ranks, produces thus by level other histogram (Hist_i).Then, obtain to have the mean value (M) of 32 other histograms of level (Hist_i).

Use weight backlight (BLW), histogrammic total number of levels and histogrammic mean value (M) to obtain yield value backlight (nBLW), the image that causes because of gain backlight with control saturated.There is such demand: according to accumulation histogram number (HH) and each other histogram number (Histc_i) of level of an accumulation histogram number (LH) that produces the first area littler by other histogram of level (Hist_i), the second area bigger than histogrammic mean value (M) than histogrammic mean value (M).Then, utilize equation 4 and 19 that each level other weight (Scoel_j and Scoe2_k) in first and second zones and each level other luminance weights (Hcoe_k) of second area are set.

According to equation 13,14,17,20 and 21, by minimum slope value (Slmin and Shmin) histogrammic these level other slopes (Slope_i) are set according to histogrammic mean value (M) control low area and high zone based on histogrammic 32 other intermediate values of level.According to equation 8,21 and 22, histogrammic these other slopes of level (Slope_i) can be provided with by the minimum slope value of controlling based on other intermediate value of 32 levels of histogrammic mean value (M) and reference histogram (Smin).

By using histogrammic these level other slopes (Slope_i), shown in Figure 16 C, luminance component (YM_i) with other modulation of these grades of enhancing contrast ratio utilizes histogrammic these level other slopes (Slope_i) and producing according to yield value backlight (nBLW).Shown in Figure 16 D, data-modulated module 70 can prevent that the hi-lite in the bright image is saturated.Shown in Figure 16 E, it can improve the contrast in the full luminance, obtains image dynamic and true to nature thus.In Figure 16 D, X-axis is corresponding to the gray shade scale of input, and Y-axis is corresponding to the gray shade scale of output.

Dark image shown in the corresponding diagram 17A, data-modulated module 70 is at the luminance component (Y) of Figure 17 B image of modulation input in the modulation treatment of 17D, to improve the contrast of full luminance, shown in Figure 17 E.

The drive unit and the method for LCD device shown in Figure 4, it comprises histogram analysis parts 56 shown in Figure 14, the histogram that uses weight backlight (BLW) and extract from the luminance component (Y) of first data (Ri, Gi and Bi) produces dynamic backlight yield value (nBLW), and produces second data (Ro, Go and Bo) by these histogrammic these other slopes of level are set with this dynamic backlight yield value (nBLW).It can obtain image dynamic and true to nature thus by control because of the saturated contrast that improves display brightness of data that the increase of gain backlight in bright image causes.

Figure 18 is the block diagram of the drive unit of LCD device.Figure 19 is the block diagram that the image quality among Figure 18 improves the unit.

Shown in Figure 18 and 19, the drive unit of this LCD device is furnished with LCD panel 22, data driver 24, gate driver 26, image quality and improves unit 80, time schedule controller 30, backlight 84 and inverter 82.The drive unit of this LCD device also comprises system 40, gamma voltage feeder 28, power supply 32 and DC/DC converter 34.

Correspondingly, will replace specific explanations to the description of LCD device shown in Figure 4 above except image quality improves unit 80, inverter 82 and backlight 84 to these structures.

The image quality of this drive unit improves unit 80 can comprise data-modulated module 70, backlight control module 92 and control module 68.Except backlight control module 92 differences, this image quality improves unit, and structurally to improve unit 42 with image quality shown in Figure 3 be identical.Thereby, except backlight control module 92, will replace specific explanations to the description of LCD device shown in Figure 3 above to other structure.

Backlight control module 92 can produce a plurality of brightness control signals (Dim1 to Dimx) relevant with histogrammic mean value (M), and these a plurality of brightness control signals (Dim1 is to Dimx) are offered inverter 82.Backlight control module 92 comprises backlight control parts 94 and digital-to-analog converting member 96.

Backlight control parts 94 produce a plurality of brightness control signals (Dim1 is to Dimx).Here, if mean value (M) has high level brightness, backlight control parts 94 produce these a plurality of brightness control signals (Dim1 is to Dimx) so, to produce the more light of high brightness.Yet if mean value (M) has lower brightness, these backlight control parts 94 produce a plurality of brightness control signals (Dim1 is to Dimx) so, to produce the light of more low-light level.Digital-to-analog converting member 96 converts a plurality of brightness control signals (Dim1 is to Dimx) to analog control signal, and this analog control signal is offered inverter 82.

Inverter 82 offers backlight 84 with a plurality of lamp driving voltages corresponding with analog control signal (Dim1 is to Dimx).Backlight 84 form the full run-down type that comprises a plurality of lamps (91 to 9x, wherein x is a natural number).Here, these a plurality of lamps (91 to 9x) are located at the rear surface of LCD panel 22.These a plurality of lamps (91 to 9x) send the light relevant with these a plurality of lamp driving voltages, and the light that will produce offers LCD panel 22.

These a plurality of lamps (91 to 9x) can be located at corresponding to LCD panel 22 ' place in x ' zone.LCD panel 22 can be divided into ' x ' zone, this zone is by the rayed of sending from these a plurality of lamps (91 to 9x).

Backlight control parts 94 produce and are provided to LCD panel 22 ' x ' regional these corresponding a plurality of brightness control signals (Dim1 is to Dimx) of data.Corresponding to this lamp driving voltage that provides according to mean value (M) from inverter 82, backlight 84 drive each lamp (91 to 9x) individually.By driving these a plurality of lamps (91 to 9x) individually, just light can be offered each of LCD panel 22 ' x ' zone.

In the drive unit and method of this LCD device, in this LCD panel, bright color can show brightlyer, and dark color can show secretlyer.Brightness backlight can be by a frame the brightness of image control, thereby obtain image dynamic and true to nature and the brightness of the image optionally strengthening showing.

In the drive unit and method of this LCD device, histogram is that the luminance component of data by will input is divided into some ranks and obtains, and these histogrammic these other slopes of level can use histogrammic mean value to be provided with, and improve contrast thus and the mean flow rate of the image that keeps showing.In addition, brightness backlight can be controlled based on histogrammic mean value, obtains image dynamic and true to nature thus.

The intermediate value of the number of levels that the minimum slope value in low area and high zone is can reference histogram total is provided with, and just can prevent the distortion of the brightness that the expansion because of contrast causes thus.

After the luminance component of data by will input is divided into some ranks and extracts histogram, can use the yield value setting backlight should histogrammic other slope of each grade according to histogram and weight backlight.Thereby can prevent the brightness that the hi-lite in the bright image is in state of saturation and improves contrast and keep raw image.By according to histogrammic mean value control brightness backlight, just on the LCD panel, demonstrate image dynamic and true to nature.

Concerning those skilled in the art, obviously, under the prerequisite of spirit that does not deviate from present disclosure or scope, in this LCD Apparatus and method for, can carry out various modifications and variations.Thereby, the invention is intended to cover all and fall into claims and these interior modifications and variations of equivalent scope thereof.

Claims (66)

1. the drive unit of a liquid crystal display device, wherein liquid crystal display device has display panels, data driver, gate driver and provides the backlight of light to display panels, comprising:

Image quality improves the unit, is used for:

Luminance component by first data that will import is divided into a plurality of ranks and produces histogram;

Utilize this histogrammic calculated value, Chan Sheng not have second data of the enhancing contrast ratio relevant step by step with this histogrammic brightness; And

Produce at least one brightness control signal relevant with this histogrammic described calculated value;

Time schedule controller is used to provide second data after this arrangement and controls this data driver and this gate driver; And

Inverter is used for driving according to this brightness control signal that this is backlight.

2. drive unit according to claim 1 is characterized in that, this image quality improves the unit and comprises:

Data modulator is used to utilize first data to produce second data;

Backlight controller is used for producing at least one brightness control signal under the control of this data-modulated device; And

Control module is used for receiving first synchronizing signal from external source, first synchronizing signal of the modulation and second data sync, and first synchronizing signal after will modulating offers this time schedule controller.

3. drive unit according to claim 2 is characterized in that, this data modulator comprises:

The luminance/chrominance separation device is used for first data are divided into luminance component and colourity-color difference components;

The histogram analysis device is used for producing histogram by the luminance component of first data is divided and analyze the histogram number according to rank, and produces slopes at different levels in the histogram based on this histogrammic calculated value;

The histogram modulator is used for by utilizing the luminance component after other this histogram number of this histogrammic each grade and slope produce the modulation of enhancing contrast ratio;

Delay cell is used for producing the colourity-color difference components of the synchronous delay of luminance component after the modulation that produces with this histogram modulator by postponing this colourity-color difference components; With

The brightness/chroma mixer is used for producing second data by mixing the luminance component after this modulation and the colourity-color difference components of this delay.

4. drive unit according to claim 3 is characterized in that, this histogram analysis device comprises:

The histogram generator is used for being divided into a plurality of ranks by the luminance component with first data and produces this histogram;

Counter is used for producing this calculated value by accumulating this histogram;

Frequency generator is used for by using this histogram and this calculated value to produce the accumulation histogram number of the first area little than this calculated value, accumulation histogram number and this histogrammic other histogram number of each grade of the second area bigger than this calculated value;

The rank weight is provided with device, is used for by using the weight backlight that external source provided, this accumulation histogram number of first area, this accumulation histogram number, this calculated value and this histogram number of second area that other weight of each grade in first and second zones and each other luminance weights of level of second area are set; And

The rank slope is provided with device, is used for by minimum slope value, this weight backlight, other this weight of each grade in first and second zones and each other this luminance weights of level of second area of using this external source to provide this histogrammic each other slope of level being set.

5. drive unit according to claim 4, it is characterized in that this rank weight is provided with device and is configured to be expressed as by obtaining: the function of (calculated value-1) * (the accumulation histogram number of other histogram number/first area of each grade) is provided with each other weight of level of first area; Be expressed as by obtaining: each other weight of level of the function setup second area of (adjacent histogram rank-calculated value) * (the accumulation histogram number of other histogram number/second area of each grade); And each other luminance weights of level of second area is set by (adjacent histogram rank-weight * calculated value backlight)/(adjacent histogram rank-calculated value).

6. drive unit according to claim 4, it is characterized in that this rank slope is provided with device and is configured to be expressed as by obtaining: the function of weight backlight * (each level other weight * (1-minimum slope value)+minimum slope value of first area) is provided with each other slope of level of first area; This other slope of histogram level that has this calculated value by weight setting backlight; And be expressed as by obtaining: the function of each other luminance weights of level of second area * (each level other weight * (1-minimum slope value)+minimum slope value of second area) is provided with each other slope of level of second area.

7. drive unit according to claim 3 is characterized in that, this histogram analysis device comprises:

The histogram generator is used for being divided into a plurality of gray scales by the luminance component with first data and produces this histogram;

Counter is used for producing this calculated value by accumulating this histogram;

Frequency generator is used for by using this histogram and this calculated value to produce the accumulation histogram number of the first area little than this calculated value, accumulation histogram number and this histogrammic other histogram number of each grade of the second area bigger than this calculated value;

The rank weight is provided with device, is used for by using the weight backlight that external source provided, this accumulation histogram number of first area, this accumulation histogram number, this calculated value and this histogram number of second area that other weight of each grade in first and second zones and each other luminance weights of level of second area are set; And

Minimum slope is provided with device, be used for by using minimum slope value, this calculated value, this histogrammic total number of levels and this histogrammic these other these intermediate values of level from this external source input, if this histogrammic this calculated value is lower than other intermediate value minimum slope of these grades the minimum slope value that device is provided with low area is set, if perhaps this calculated value is higher than this intermediate value minimum slope the minimum slope value that device is provided with high zone is set; And

The rank slope is provided with device, is used to use other weight of level in minimum slope value, this weight backlight, first and second zones in this low area and this height zone and other luminance weights of level of second area that this histogrammic other slope of this level is set.

8. drive unit according to claim 7, it is characterized in that this rank weight is provided with device and is configured to be expressed as by obtaining: the function of (calculated value-1) * (the accumulation histogram number of other histogram number/first area of each grade) is provided with first area other weight of this level; Be expressed as by obtaining: the function of (adjacent histogram rank-calculated value) * (the accumulation histogram number of other histogram number/second area of each grade) is provided with other weight of this level of second area; And by determining that the function that is expressed as (adjacent histogram rank-weight * calculated value backlight)/(adjacent histogram rank-calculated value) is provided with other luminance weights of this level of second area.

9. drive unit according to claim 8, it is characterized in that, if this calculated value is equal to or less than these other this intermediate values of level, this minimum slope is provided with device and is configured to be expressed as by obtaining: the minimum slope value of the function setup low area of 1-(histogrammic total number of levels-other intermediate value of level)/(level other intermediate value-1) * (1-minimum slope value), and wherein, if this count value is greater than these other this intermediate values of level, this minimum slope is provided with device and is configured to be expressed as by obtaining: the function of 1-(1-minimum slope value) * (level other intermediate value-1)/(histogrammic total number of levels-other intermediate value of level) is provided with this minimum slope value in this height zone.

10. drive unit according to claim 9, it is characterized in that this rank slope is provided with device and is configured to be expressed as by obtaining: the function of weight backlight * (the minimum slope value of each level other weight * (the minimum slope value of 1-low area)+low area of first area) is provided with each other slope of level of first area; Other slope of histogram level that comprises this calculated value by this weight setting backlight; And be expressed as by obtaining: the function of each other luminance weights of level of second area * (the minimum slope value in each other weight of level of second area * (the minimum slope value in the high zone of 1-)+high zone) is provided with each other slope of level of second area.

11. drive unit according to claim 3, it is characterized in that this histogram modulator can be configured to obtain the luminance component after the function that is expressed as each level other slope * (current histogram rank-last histogram rank)+other histogram number of previous stage of histogram produces this modulation.

12. drive unit according to claim 2 is characterized in that, this backlight controller comprises:

The backlight control parts are used for producing at least one brightness control signal according to this histogrammic this calculated value; With

The digital-to-analog converting member is used for converting this brightness control signal that these backlight control parts are provided to simulating signal.

13. drive unit according to claim 2 is characterized in that, this is backlight to comprise at least one lamp, and this at least one lamp offers light by dividing at least one zone that this display panels becomes a plurality of zones to form.

14. drive unit according to claim 13, it is characterized in that, this backlight controller configuration produces at least one brightness control signal, and this signal produces the proportional light of a regional luminance with this display panels, and the brightness control signal that is produced is offered this inverter.

15. drive unit according to claim 1 is characterized in that, this histogrammic this calculated value comprises this histogrammic mean value.

16. drive unit according to claim 1 is characterized in that, this histogrammic this calculated value comprises this histogrammic intermediate value.

17. the drive unit of a liquid crystal display device, wherein this liquid crystal display device has display panels, data driver, gate driver and light is offered the backlight of this display panels, comprising:

Image quality improves the unit, is used for:

Generation is used for representing by rank the histogram of the luminance component of first data imported;

Utilization from the weight backlight of external source input with produce second data that have with by the relevant enhancing contrast ratio of the histogrammic brightness of level other this by other histogrammic this brightness of level; And

Produce at least one brightness control signal according to this histogrammic calculated value;

Time schedule controller, it provides second data, and controls this data driver and this gate driver; And

Inverter, it drives based on this brightness control signal, and this is backlight.

18. drive unit according to claim 17 is characterized in that, this image quality improves the unit and comprises:

Data modulator is used to utilize first data to produce second data;

Backlight controller is used for producing at least one brightness control signal under the control of this data-modulated device; And

Control module is used for receiving first synchronizing signal from external source, first synchronizing signal is modulated into and second data sync, and first synchronizing signal after will modulating offers this time schedule controller.

19. drive unit according to claim 18 is characterized in that, this data modulator comprises:

The luminance/chrominance separation device is used for first data are divided into luminance component and colourity-color difference components;

The histogram analysis device is used for producing histogram by this luminance component of first data is divided and analyze the histogram number according to rank, and produces each other slope of level of this histogram based on this histogrammic calculated value;

The histogram modulator is used for by utilizing the luminance component after other this histogram number of this histogrammic each grade and slope produce the modulation of enhancing contrast ratio;

Delay cell is used for the colourity-color difference components by the synchronous delay of the luminance component after the modulation that postpones this colourity-color difference components generation and the generation of this histogram modulator; And

The brightness/chroma mixer is used for the luminance component by mixing this modulation and the colourity-color difference components of this delay and produces second data.

20. drive unit according to claim 19 is characterized in that, this histogram analysis device comprises:

The histogram generator is used for being divided into a plurality of ranks by the luminance component with first data and produces this histogram;

Counter is used for producing this calculated value by accumulating this histogram;

Gain controller backlight is used to utilize this calculated value, weight backlight and this histogrammic total number of levels to produce yield value backlight;

Frequency generator is used for by using this histogram and this calculated value to produce the accumulation histogram number of the first area little than this calculated value, accumulation histogram number and this histogrammic other histogram number of each grade of the second area bigger than this calculated value;

The rank weight is provided with device, is used for by this accumulation histogram number that uses yield value backlight, first area, other this histogram number of this accumulation histogram number, this calculated value and this level of second area other luminance weights of second area one-level being set; And

The rank slope is provided with device, and each other this luminance weights of level that minimum slope value, this yield value backlight, other this weight of first and second each grades of zone and second area by using this external source to provide are provided is provided with this histogrammic other slope of this level.

21. drive unit according to claim 20 is characterized in that, this gain controller backlight can be expressed as by obtaining: the function of (((weight backlight-1)/histogrammic total number of levels) * calculated value+weight backlight) produces this yield value backlight.

22. drive unit according to claim 20, it is characterized in that this rank weight is provided with device and is configured to be expressed as by obtaining: the function of ((calculated value-1) * (the accumulation histogram number of other histogram number/first area of each grade)) is provided with other weight of one-level of first area; Be expressed as by obtaining: the function of ((adjacent histogram rank-calculated value) * (the accumulation histogram number of other histogram number/second area of each grade)) is provided with other weight of one-level of second area; And be expressed as by obtaining: (function of (adjacent histogram rank-weight * calculated value backlight)/(adjacent histogram rank-calculated value) is provided with other this luminance weights of this level of second area.

23. drive unit according to claim 20, it is characterized in that this rank slope is provided with device and can be expressed as by obtaining: the function of (yield value backlight * (each regional weight of first area * (1-minimum slope value)+minimum slope value)) is provided with other slope of one-level of first area; This other slope of histogram level that comprises this calculated value by this yield value setting backlight; And be expressed as by obtaining: the function of (each other luminance weights of level of second area * (each level other weight * (1-minimum slope value)+minimum slope value of second area)) is provided with other slope of this level of second area.

24. the drive unit according to claim 19 is characterized in that, this histogram analysis device comprises:

The histogram generator is used for being divided into a plurality of gray scales by the luminance component with first data and produces this histogram;

Counter is used for producing this calculated value by accumulating this histogram;

Gain controller backlight is used to utilize this calculated value, weight backlight and this histogrammic total number of levels to produce yield value backlight;

Frequency generator is used for by using this histogram and this calculated value to produce the accumulation histogram number of the first area little than this calculated value, accumulation histogram number and this histogrammic other histogram number of each grade of the second area bigger than this calculated value;

The rank weight is provided with device, is used for by this accumulation histogram number that uses this yield value backlight, first area, other this histogram number of this accumulation histogram number, this calculated value and each grade of second area each other luminance weights of level of second area being set; And

Minimum slope is provided with device, be used for by using this intermediate value of the histogrammic total number of levels of minimum slope value from this external source input, this calculated value, this histogrammic this number of levels and this, other this intermediate value minimum slope is provided with the minimum slope value that device is provided with low area if this histogrammic this calculated value is lower than these grades, if perhaps this calculated value is higher than this intermediate value then minimum slope is provided with the minimum slope value that device is provided with high zone; And

The rank slope is provided with device, is used to use this minimum slope value, this yield value backlight, other weight of each grade in first and second zones and each other luminance weights of level of second area in this low area and this height zone that this histogrammic each other slope of level is set.

25. drive unit according to claim 24, it is characterized in that the function that this gain controller backlight is configured to be expressed as by obtaining (((weight backlight-1)/histogrammic total number of levels) * calculated value+weight backlight) produces this yield value backlight.

26. drive unit according to claim 24, it is characterized in that this rank weight is provided with device and is configured to be expressed as by obtaining: the function of ((calculated value-1) * (the accumulation histogram number of other histogram number/first area of each grade)) is provided with other weight of one-level of first area; Be expressed as by obtaining: the function of ((adjacent histogram rank-calculated value) * (the accumulation histogram number of other histogram number/second area of each grade)) is provided with each other weight of level of second area; And be expressed as by obtaining: (function of (adjacent histogram rank-yield value * calculated value backlight)/(adjacent histogram rank-calculated value) is provided with each other this luminance weights of level of second area.

27. drive unit according to claim 24, it is characterized in that, if this calculated value is equal to or less than these other this intermediate values of level, this minimum slope is provided with device and is configured to be expressed as by obtaining: this minimum slope value of this low area of function setup of (1-(histogrammic total number of levels-these other intermediate values of level)/(these level other intermediate values-1) * (1-minimum slope value)), if and this count value is greater than these other this intermediate values of level, this minimum slope is provided with apparatus and is configured to be expressed as by obtaining: the function of (1-(1-minimum slope value) * (these level other intermediate value-1)/(histogrammic total number of levels-these other intermediate values of level)) is provided with this minimum slope value in this height zone.

28. drive unit according to claim 27, it is characterized in that this rank slope is provided with device and is configured to be expressed as by obtaining: the function of (yield value backlight * (the minimum slope value of each level other weight * (the minimum slope value of 1-low area)+low area of first area)) is provided with each other slope of level of first area; This other slope of histogram level that comprises this calculated value by this yield value setting backlight; And be expressed as by obtaining: the function of (each other weight of level of second area * (the minimum slope value in each other weight of level of second area * (the minimum slope value in the high zone of 1-)+high zone)) is provided with each other slope of level of second area.

29. drive unit according to claim 19, it is characterized in that this histogram modulator configuration is for to be expressed as by obtaining: the function of (each level other slope * (current histogram rank-last histogram rank)+other histogram number of previous stage of histogram) produces the luminance component after this modulation.

30. drive unit according to claim 18 is characterized in that, this backlight controller comprises:

The backlight control parts are used for producing at least one brightness control signal according to this histogrammic this calculated value; And

The digital-to-analog converting member, this brightness control signal that is used for this backlight control unit is provided converts simulating signal to.

31. drive unit according to claim 18 is characterized in that, this is backlight to comprise at least one lamp, and described at least one lamp offers light by dividing at least one zone that this display panels becomes a plurality of zones to form.

32. drive unit according to claim 31, it is characterized in that, this backlight controller is used to produce at least one brightness control signal, and this signal produces the proportional light of a regional luminance with this display panels, and the brightness control signal that is produced is offered this inverter.

33. drive unit according to claim 17 is characterized in that, this histogrammic this calculated value comprises this histogrammic mean value.

34. drive unit according to claim 17 is characterized in that, this histogrammic this calculated value comprises this histogrammic intermediate value.

35. the driving method of a liquid crystal display device, wherein this liquid crystal display device have the display panels that is used to show the image corresponding with data-signal, be used for this data-signal offer this display panels data driver, be used for sweep signal is offered the gate driver of this display panels, comprising:

Luminance component by first data that will import is divided into a plurality of ranks and produces histogram, and utilizes this histogrammic calculated value to produce to have and should be according to second data of the relevant enhancing contrast ratio of other histogrammic brightness of level;

Arrange second data; And

Second number after arranging is offered this data driver.

36. driving method according to claim 35 is characterized in that, also comprises:

Produce at least one brightness control signal based on this histogrammic this calculated value; And

Provide light based on this brightness control signal to this display panels.

37. driving method according to claim 35 is characterized in that, the step of described generation second data comprises:

First data are divided into luminance component and colourity-color difference components;

Analyze the histogram number and this other slope of histogram one-level is set with this histogrammic this calculated value;

By the luminance component after the modulation of using other this histogram number of this histogrammic this level and slope generation enhancing contrast ratio;

Produce the colourity-color difference components of delay by postponing the luminance component of this colourity-color difference components after producing this modulation; And

The luminance component by mixing this modulation and the colourity-color difference components of this delay produce second data.

38., it is characterized in that the described step that this other histogram number of histogrammic this level and slope are set comprises according to the described driving method of claim 37:

Be divided into a plurality of ranks by this luminance component and produce this histogram first data;

Produce this calculated value by accumulating this histogram;

By using this histogram and this calculated value to produce the histogram number of the first area littler and the histogram number of the second area bigger than this calculated value than this calculated value;

By the weight backlight of using this external source to provide, this accumulation histogram number of first area, this accumulation histogram number, this calculated value and this histogram number of second area other weight of one-level of first area and second area and other luminance weights of this level of second area are set; And

Other this weight of this grade of minimum slope value, this weight backlight, first area and second area by using this external source to provide and other this luminance weights of this level of second area are provided with this histogrammic other slope of this level.

39., it is characterized in that the step of other luminance weights of each grade of described other weight of each grade that first area and second area be set and second area comprises according to the described driving method of claim 38:

Be expressed as by obtaining: the function of (calculated value-1) * (the accumulation histogram number of other histogram number/first area of each grade) is provided with each other weight of level of first area;

Be expressed as by obtaining: the function of (adjacent histogram rank-calculated value) * (the accumulation histogram number of other histogram number/second area of each grade) is provided with other this weight of this level of second area;

Be expressed as by obtaining: (adjacent histogram rank-weight * calculated value backlight)/(adjacent histogram rank-calculated value) is provided with other this luminance weights of this level of second area.

40., it is characterized in that the described step that this histogrammic other slope of each grade is set comprises according to the described driving method of claim 38:

Be expressed as by obtaining: the function of weight backlight * (each level other weight * (1-minimum slope value)+minimum slope value of first area) is provided with other this slope of this level of first area;

Other this slope of this histogram level that comprises this mean value by this weight setting backlight;

Be expressed as by obtaining: the function of each other luminance weights of level of second area * (each level other weight * (1-minimum slope value)+minimum slope value of second area) is provided with other this slope of this level of second area.

41., it is characterized in that the described step that other histogram number of each grade and slope are set comprises according to the described driving method of claim 37:

Be divided into a plurality of ranks by this luminance component and produce this histogram first data;

Produce this calculated value by accumulating this histogram;

By using this histogram and this calculated value to produce the accumulation histogram number of the first area littler, accumulation histogram number and this other histogram number of histogrammic this level of the second area bigger than this calculated value than this calculated value;

By the weight backlight of using this external source to provide, this accumulation histogram number of first area, this accumulation histogram number, this calculated value and this histogram number of second area other weight of this grade in first and second zones and other luminance weights of this level of second area are set;

By using minimum slope value, this calculated value, this histogrammic total number of levels and this histogrammic these other these intermediate values of level from this external source input, the minimum slope value that high zone is set if this calculated value of event histogram is lower than that other intermediate value of these grades is provided with then that the minimum slope value of low area and this calculated value are higher than this intermediate value; With

Use this minimum slope value, this weight backlight, other weight of each grade in first and second zones and other luminance weights of this level of second area in this low area and this height zone that this histogrammic other slope of this level is set.

42., it is characterized in that the step of other luminance weights of this grade of described other weight of this grade that first and second zones are set and second area comprises according to the described driving method of claim 41:

Be expressed as by obtaining: the function of (calculated value-1) * (the accumulation histogram number of other histogram number/first area of each grade) is provided with first area other weight of this level;

Be expressed as by obtaining: the function of (adjacent histogram rank-calculated value) * (the accumulation histogram number of other histogram number/second area of each grade) is provided with other weight of this level of second area;

Be expressed as by obtaining: the function of (adjacent histogram rank-weight * calculated value backlight)/(adjacent histogram rank-calculated value) is provided with other luminance weights of this level of second area.

43., it is characterized in that the described step that the minimum slope value in this low area and this height zone is set comprises according to the described driving method of claim 41:

If this calculated value is equal to or less than these other this intermediate values of level, be expressed as by obtaining: the function of 1-(histogrammic total number of levels-these other intermediate values of level)/(these level other intermediate values-1) * (1-minimum slope value) is provided with this minimum slope value of this low area; And

If this count value is expressed as by obtaining greater than these other this intermediate values of level: the function of (1-(1-minimum slope value) * (these level other intermediate values-1)/(histogrammic total number of levels-these other intermediate values of level)) is provided with this minimum slope value in this height zone.

44., it is characterized in that the described step that this histogrammic other slope of level is set comprises according to the described driving method of claim 43:

The function that is expressed as (weight backlight * (each level other weight * (1-minimum slope value)+minimum slope value of first area)) by obtaining is provided with other this slope of this level of first area;

Other this slope of this histogram level that has this calculated value by this weight setting backlight; And

Be expressed as by obtaining: the function of (each other luminance weights of level of second area * (each level other weight * (1-minimum slope value)+minimum slope value of second area)) is provided with other this slope of this level of second area.

45. according to the described driving method of claim 37, it is characterized in that the step of the luminance component after this modulation of described generation comprises by obtaining the luminance component after the function that is expressed as (each level other slope * (current histogram rank-last histogram rank)+other histogram number of previous stage of histogram) produces this modulation.

46. driving method according to claim 36 is characterized in that, describedly provides the step of light to comprise to this liquid crystal display:

Produce lamp driving voltage according to this brightness control signal; And

Drive at least one lamp with this lamp driving voltage, make it light is transmitted into this display panels that is divided at least one zone.

47., it is characterized in that at least one brightness control signal of described generation comprises according to the described driving method of claim 46: produce at least one brightness control signal, with the proportional light of this regional luminance of generation with this display panels.

48. driving method according to claim 35 is characterized in that, this histogrammic this calculated value comprises this histogrammic mean value.

49. driving method according to claim 35 is characterized in that, this histogrammic this calculated value comprises this histogrammic intermediate value.

50. the driving method of a liquid crystal display device, wherein this liquid crystal display device comprises the display panels that is used to show the image corresponding with data-signal, is used for the data driver of this data-signal being provided and being used for providing to this display panels the gate driver of sweep signal to this display panels, comprising:

Luminance component by first data that will import is divided into a plurality of ranks and produces histogram, and use from the weight backlight of this external source input produce comprise with by relevant enhancing contrast ratio second data of the histogrammic brightness of level other this;

Arrange second data; And

Second data after this arrangement are offered this data driver.

51. according to the described driving method of claim 50, it is characterized in that, also comprise:

Produce at least one brightness control signal based on this histogrammic calculated value; And

Provide light based on this brightness control signal to this display panels.

52., it is characterized in that the step of described generation second data comprises according to the described driving method of claim 50:

First data are divided into luminance component and colourity-color difference components;

Analyze the histogram number and other slope of this level of this histogram is set with this histogrammic this calculated value;

By the luminance component after the modulation of using other this histogram number of this histogrammic this level and slope generation enhancing contrast ratio;

By postponing to produce the colourity-color difference components that postpones till the luminance component of this colourity-color difference components after producing this modulation finishes; And

The luminance component by mixing this modulation and the colourity-color difference components of this delay produce second data.

53., it is characterized in that the described step that other this histogram number of this grade and slope are set comprises according to the described driving method of claim 52:

Be divided into a plurality of ranks by this luminance component and produce this histogram first data;

Produce this calculated value by accumulating this histogram;

Use this calculated value, this weight backlight and this histogrammic total number of levels to produce yield value backlight;

By using this histogram and this calculated value to produce the histogram number of the first area littler and the histogram number of the second area bigger than this calculated value than this calculated value;

By this accumulation histogram number that uses this yield value backlight, first area, other this histogram number of this accumulation histogram number, this calculated value and this level of second area other luminance weights of this level of second area is set; And

Other this weight of this grade of minimum slope value, this yield value backlight, first area and second area by using this external source to provide and other this luminance weights of this level of second area are provided with this histogrammic other slope of this level.

54., it is characterized in that the step of described this yield value backlight of generation comprises obtains the function that is expressed as (((weight backlight-1)/histogrammic total number of levels) * calculated value+weight backlight) according to the described driving method of claim 53.

55., it is characterized in that the step of other this luminance weights of this grade of described other weight of this grade that first area and second area be set and second area comprises according to the described driving method of claim 53:

The function that is expressed as ((calculated value-1) * (the accumulation histogram number of other histogram number/first area of each grade)) by obtaining is provided with other this weight of this level of first area;

The function that is expressed as ((adjacent histogram rank-calculated value) * (the accumulation histogram number of other histogram number/second area of each grade)) by obtaining is provided with other this weight of this level of second area;

Be expressed as ((adjacent histogram rank-yield value * calculated value backlight)/(adjacent histogram rank-calculated value)) by obtaining other this luminance weights of this level of second area is set.

56., it is characterized in that the described step that this histogrammic other slope of each grade is set comprises according to the described driving method of claim 53:

The function that is expressed as (yield value backlight * (each level other weight * (1-minimum slope value)+minimum slope value of first area)) by obtaining is provided with other this slope of this level of first area;

Other this slope of this histogram level that comprises this calculated value by this yield value setting backlight; And

The function that is expressed as (each other luminance weights of level of second area * (each level other weight * (1-minimum slope value)+minimum slope value of second area)) by obtaining is provided with other this slope of this level of second area.

57., it is characterized in that the described step that other this histogram number of this grade and slope are set comprises according to the described driving method of claim 52:

Be divided into a plurality of ranks by this luminance component and produce this histogram first data;

Produce this calculated value by accumulating this histogram;

Use this calculated value, weight backlight and this histogrammic total number of levels to produce yield value backlight;

By using this histogram and this calculated value to produce the accumulation histogram number of the first area littler, accumulation histogram number and this other histogram number of histogrammic this level of the second area bigger than this calculated value than this calculated value;

By this accumulation histogram number that uses this yield value backlight, first area, other this histogram number of this accumulation histogram number, this calculated value and this level of second area other luminance weights of this level of second area is set;

By using from this intermediate value of minimum slope value, this calculated value, this histogrammic whole number of levels and this histogrammic whole number of levels of this external source input, this calculated value of event histogram is lower than the minimum slope value that other intermediate value of these grades is provided with low area, and if this calculated value be higher than this intermediate value then the minimum slope value in high zone; And

Use this minimum slope value, this yield value backlight, other weight of this grade in first and second zones and other luminance weights of this level of second area in this low area and this height zone that this histogrammic other slope of this level is set.

58., it is characterized in that the step of described generation yield value backlight comprises obtains the function that is expressed as (((weight backlight-1)/histogrammic total number of levels) * calculated value+weight backlight) according to the described driving method of claim 57.

59., it is characterized in that the step of other this luminance weights of this grade of described other this weight of this grade that first and second zones are set and second area comprises according to the described driving method of claim 57:

The function that is expressed as ((calculated value-1) * (the accumulation histogram number of other histogram number/first area of each grade)) by obtaining is provided with first area other weight of this level;

The function that is expressed as ((adjacent histogram rank-calculated value) * (the accumulation histogram number of other histogram number/second area of each grade)) by obtaining is provided with other weight of this level of second area;

The function that is expressed as ((adjacent histogram rank-yield value * calculated value backlight)/(adjacent histogram rank-calculated value)) by obtaining is provided with other luminance weights of this level of second area.

60., it is characterized in that the described step that this minimum slope value in this low area and this height zone is set comprises according to the described driving method of claim 57:

If this calculated value is equal to or less than these other this intermediate values of level, the function that then is expressed as (1-(histogrammic total number of levels-these other intermediate values of level)/(these level other intermediate values-1) * (1-minimum slope value)) by obtaining is provided with this minimum slope value of this low area; And

(function of (1-(1-minimum slope value) * (these level other intermediate values-1)/(histogrammic total number of levels-these other intermediate values of level)) is provided with this minimum slope value in this height zone if this calculated value greater than these other this intermediate values of level, then is expressed as by obtaining.

61., it is characterized in that the described step that this histogrammic this other slope of level is set comprises according to the described driving method of claim 60:

The function that is expressed as (yield value backlight * (the minimum slope value of each level other weight * (the minimum slope value of 1-low area)+low area of first area)) by obtaining is provided with other this slope of this level of first area;

Other this slope of this histogram level that comprises this calculated value by this yield value setting backlight; And

Be expressed as by obtaining that (function of (each other luminance weights of level of second area * (the minimum slope value in each level other weight * (1-high zone minimum slope value)+high zone of second area)) is provided with other this slope of this level of second area.

62. according to the described driving method of claim 62, it is characterized in that the step of the luminance component after this modulation of described generation comprises by obtaining the luminance component after the function that is expressed as (histogrammic each level other slope * (current histogram rank-last histogram rank)+other histogram number of previous stage) produces this modulation.

63. according to the described driving method of claim 51, it is characterized in that, describedly provide the step of light to comprise to this liquid crystal display:

Produce lamp driving voltage according to this brightness control signal; And

Drive at least one lamp with this lamp driving voltage, make it light is transmitted into this display panels that is divided at least one zone.

64., it is characterized in that the step of at least one brightness control signal of described generation comprises according to the described driving method of claim 63: produce at least one brightness control signal with the proportional light of brightness of generation with a zone of this display panels.

65., it is characterized in that this histogrammic this calculated value comprises this histogrammic mean value according to the described driving method of claim 50.

66., it is characterized in that this histogrammic this calculated value comprises this histogrammic intermediate value according to the described driving method of claim 50.

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