CN103839527B - Driving method of liquid crystal display device - Google Patents

Abstract

A driving method of a liquid crystal display device includes: receiving original gray scale data; determining the colors of the first, second and third sub-frames according to the original gray scale data; simultaneously converting the gray scale values of the first, second and third sub-frames into corresponding penetration degrees; calculating a first opening time and a second opening time according to the penetration degree; converting the original gray scale data into display gray scale data according to the first and second opening time; turning on a first light source in a display period of a first subframe, and turning on a second light source in a display period of a second subframe; in the display period of the third subframe, a third light source is started, and simultaneously, a first light source and a second light source are respectively started according to the first starting time and the second starting time; and providing display gray scale data to the liquid crystal display panel in the display periods of the first sub-frame, the second sub-frame and the third sub-frame.

Description

Driving method of liquid crystal display device

technical field

The present invention relates to a flat display technology, and in particular to a driving method for a field color sequential liquid crystal display device.

Background technique

In the technical field of color sequential color display, a color sequential liquid crystal display can display a color within one frame by using three-color light sources of red (R), green (G) and blue (B). Sequentially emit light, so that the human eye produces a phenomenon of persistence of vision and mixes the three colors of light to achieve the effect of color display. Since RGB light-emitting diodes are used as the backlight of the backlight module, the color sequential LCD does not need to use color filters of different colors to achieve color display like the traditional LCD with white backlight. Effect. Therefore, the color sequential liquid crystal display can have a higher aperture ratio and transmittance than the traditional liquid crystal display.

However, due to the relative speed between the human eye and the image, when the color sequential liquid crystal display mixes colors and displays the image in the way of RGB rotation, the three sub-frames corresponding to RGB cannot completely overlap on the observer's retina, Or because the object flashes quickly in front of the monitor or when the observer blinks, only some colors are revealed and the colors cannot be overlapped. This phenomenon is generally called Color Breakup (CBU), and this phenomenon will be serious. The quality of the image is greatly affected, and even the observer is uncomfortable.

Contents of the invention

The invention provides a driving method of a liquid crystal display device, which can effectively reduce the color separation phenomenon of the color sequential liquid crystal display.

The present invention proposes a driving method for a liquid crystal display device, comprising: receiving original grayscale data of input image data; determining the colors of the first subframe, the second subframe and the third subframe according to the original grayscale data, wherein the first The subframe, the second subframe, and the third subframe respectively include a plurality of grayscale values; simultaneously convert the grayscale values of the first subframe, the second subframe, and the third subframe to corresponding multiple penetrations; according to Calculate the first opening time and the second opening time according to the plurality of penetrations; convert the original grayscale data into display grayscale data according to the first opening time and the second opening time; during the display period of the first subframe, Turn on the first light source, and turn on the second light source during the display period of the second subframe; turn on the third light source during the display period of the third subframe, and simultaneously Turn on the first light source and the second light source; and provide display gray scale data to the liquid crystal display panel during the display period of the first subframe, the second subframe and the third subframe.

In an embodiment of the present invention, the step of determining the colors of the first subframe, the second subframe, and the third subframe according to the original grayscale data includes: judging the red subframe, the green subframe, and the blue subframe in the original grayscale data. The maximum grayscale value and the minimum grayscale value of the color subframe.

In an embodiment of the present invention, the step of determining the colors of the first subframe, the second subframe, and the third subframe according to the original grayscale data further includes: setting the first color weight coefficient, the second color weight coefficient, and the second color weight coefficient Three color weighting coefficients.

In an embodiment of the present invention, the step of determining the colors of the first subframe, the second subframe, and the third subframe according to the original grayscale data further includes: calculating the first equation (βR _max /G _min +γR _max /B _min ), where the first equation corresponds to the red subframe; calculate the second equation (αG _max /R _min +γG _max /B _min ), where the second equation corresponds to the green subframe; and calculate the third equation (αB _max / R _min +βB _max /G _min ), where the third program corresponds to the blue subframe. Among them, R _max , G _max and B _max are the maximum gray scale values of the red subframe, green subframe and blue subframe respectively in the original grayscale data, and R _min , G _min and B _min are the original grayscale data respectively The minimum grayscale values of the red subframe, green subframe and blue subframe in , α, β and γ are respectively the first color weight coefficient, the second color weight coefficient and the third color weight coefficient.

In an embodiment of the present invention, the step of determining the colors of the first subframe, the second subframe, and the third subframe according to the original grayscale data further includes: according to the calculation results of the first equation, the second equation, and the third-party program , to judge the first value, the second value and the minimum value of the first equation, the second equation and the third equation.

In an embodiment of the present invention, the step of determining the colors of the first subframe, the second subframe, and the third subframe according to the original grayscale data further includes: determining the colors of the first subframe and the third subframe according to the first value and the second value respectively. the color of the second subframe; and determining the color of the third subframe according to the minimum value.

In an embodiment of the present invention, the step of calculating the first opening time and the second opening time according to the plurality of penetrations includes: dividing the minimum penetration of the first subframe by the maximum penetration of the third subframe degrees to calculate the first on-time ratio; and divide the minimum penetration of the second subframe by the maximum penetration of the third subframe to calculate the second on-time ratio.

In an embodiment of the present invention, the step of calculating the first turn-on time and the second turn-on time according to the plurality of penetrations further includes: multiplying the display period of the first subframe by the first turn-on time ratio to calculate the second turn-on time a turn-on time; and multiplying the display period of the second sub-frame by the second turn-on time ratio to calculate the second turn-on time.

In an embodiment of the present invention, the step of converting the original grayscale data into displayed grayscale data includes: multiplying the transparency of the third subframe by the first opening time ratio and the second opening time ratio to calculate the first Brightness contributions of the light source and the second light source in the display period of the third subframe.

In an embodiment of the present invention, the step of converting the original grayscale data into displayed grayscale data further includes: subtracting the first light source and the second light source from the first subframe and the second subframe respectively. The luminance contribution occupied in the display period of the third subframe is used to calculate the compensated transmittance of the first subframe and the second subframe.

In an embodiment of the present invention, the step of converting the original grayscale data into display grayscale data further includes: converting the compensated transparency of the first subframe and the second subframe into a compensated grayscale value, To obtain display grayscale data.

In an embodiment of the present invention, the step of converting the original grayscale data into displayed grayscale data further includes: converting the first subframe and the second subframe through the The maximum penetration among the compensated penetrations is respectively adjusted to the maximum critical penetration; Adjust the transparency ratio.

In an embodiment of the present invention, the step of converting the original grayscale data into display grayscale data further includes: converting the adjusted transparency of the first subframe and the second subframe into a compensated grayscale value, To obtain display grayscale data.

In an embodiment of the present invention, after the step of converting the original gray-scale data into display gray-scale data, the driving method further includes: shortening the first sub-frame and the second sub-frame according to the penetration ratio between the first sub-frame and the second sub-frame The display period of the second subframe.

In an embodiment of the present invention, the step of shortening the display period of the first subframe and the second subframe according to the penetration ratio of the first subframe and the second subframe includes: The display period of the frame is respectively divided by the penetration ratio of the first subframe and the second subframe, so as to shorten the display period of the first subframe and the second subframe.

In an embodiment of the present invention, during the display period of the third subframe, the step of turning on the third light source and simultaneously turning on the first light source and the second light source according to the first turn-on time and the second turn-on time includes: The first turn-on time and the second turn-on time are both equally distributed in the display period of the third sub-frame.

Based on the above, the driving method of the liquid crystal display device according to the embodiment of the present invention can adjust the grayscale value of the displayed image and the turn-on time of each light source in the light-mixing sub-frame according to the grayscale value of the input image in each frame, so as to improve the color separation phenomenon. In particular, the driving method of the liquid crystal display device according to the embodiment of the present invention can achieve the effect of improving the color separation phenomenon without adding additional hardware and without sacrificing the color saturation of the image, thereby ensuring the product cost and display performance of the liquid crystal display device at the same time. quality.

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail together with the accompanying drawings.

Description of drawings

FIG. 1 is a schematic diagram of a liquid crystal display device according to an embodiment of the present invention.

FIG. 2 is a flow chart of steps of a driving method of a liquid crystal display device according to an embodiment of the present invention.

FIG. 3 is a flowchart of steps of a driving method of a liquid crystal display device according to another embodiment of the present invention.

FIG. 4 is a schematic diagram of original grayscale data and original turn-on time data according to an embodiment of the present invention.

FIG. 5 is a schematic diagram of judging the maximum gray scale value and the minimum gray scale value according to an embodiment of the present invention.

FIG. 6 is a schematic diagram of converting the gray scale values of the first subframe, the second subframe and the third subframe into transparency according to an embodiment of the present invention.

FIG. 7 is a schematic diagram of calculating brightness contributions of other colors in a third subframe according to an embodiment of the present invention.

FIG. 8 is a schematic diagram of calculating the compensated penetration according to an embodiment of the present invention.

FIG. 9 is a schematic diagram of converting the compensated transmittance into grayscale values according to an embodiment of the present invention.

FIG. 10 is a schematic diagram of driving a light source in one frame by a liquid crystal display device according to an embodiment of the present invention.

FIG. 11 is a flowchart of steps of a driving method of a liquid crystal display device according to yet another embodiment of the present invention.

FIG. 12 is a flow chart of steps for adjusting the penetration of the first subframe and the second subframe according to the penetration ratio according to an embodiment of the present invention.

FIG. 13 is a schematic diagram of converting the adjusted transmittance into grayscale values according to an embodiment of the present invention.

FIG. 14 is a schematic diagram of driving a light source in one frame by a liquid crystal display device according to another embodiment of the present invention.

FIG. 15 is a schematic diagram of driving a light source in one frame by a liquid crystal display device according to another embodiment of the present invention.

[Description of main component labels]

100: liquid crystal display device 110: liquid crystal display panel

120: Backlight module 122: First light source

124: Second light source 126: Third light source

130: drive device 132: timing controller

134: Gate driver 136: Source driver

138: Light source driver

S200～S214, S302～S322, S1122～S1128: steps

F1: first subframe F2: second subframe

F3: Third subframe R: Red subframe

G: Green subframe B: Blue subframe

R _max , G _max , B _max : maximum gray scale value R _min , G _min , B _min : minimum gray scale value

Tr, Tg, Tb: Display period Tbr: First turn-on time

Tbg: second opening time

detailed description

Embodiments of the present invention propose a liquid crystal display device and a driving method thereof, which can reduce the human eye's perception of different colors when they exist alone by incorporating part of the display time of sub-frames of different colors into the display time of the main sub-frame. The sensitivity of pure color, thereby reducing the color separation phenomenon of color sequential LCD. In order to make the content of the present invention more comprehensible, the following specific examples are given as examples in which the present invention can indeed be implemented. In addition, wherever possible, elements/components/steps using the same reference numerals in the drawings and embodiments represent the same or similar parts.

FIG. 1 is a schematic diagram of a liquid crystal display device according to an embodiment of the present invention. Please refer to FIG. 1, the liquid crystal display device 100 applied to the driving method of this embodiment can use the color sequential method to form a color image without using a color filter (Color Filter, CF), so as to reduce the cost of the color filter. cost, and can increase the light transmittance of the liquid crystal display device 100 . The liquid crystal display device 100 includes a liquid crystal display panel 110 , a backlight module 120 and a driving device 130 .

In this embodiment, the backlight module 120 is provided with a plurality of different color light sources (not shown) to provide different color light, which can emit different color light according to a preset color sequence, such as red - Green-Blue (R-G-B), Red-Green-Blue-White (R-G-B-W) or Red-Green-Blue-White-Yellow (R-G-B-W-Y), where yellow can be composed of red and green. The backlight module 120 can be an edge lighting backlight module or a bottom lighting backlight module, and the light source of the backlight module 120 can be, for example, a light emitting diode (Light Emitting Diode, LED) or an organic light emitting diode. (Organic Light Emitting Diode, OLED). In this embodiment, the backlight module 120 may include a first light source 122 , a second light source 124 and a third light source 126 of different colors. For example, the first light source 122 is a red light source, the second light source 124 is a green light source, and the third light source 126 is a blue light source, and the first light source 122 , the second light source 124 and the third light source 126 can be LEDs.

As shown in FIG. 1 , the driving device 130 of this embodiment can be disposed on a circuit board (not shown), and electrically connected to the liquid crystal display panel 110 and the backlight module 120 . Furthermore, the driving device 130 may include, for example, a timing controller 132 (Timing Controller, T-CON), a gate driver 134 (Gate Driver), a source driver 136 (SourceDriver), and a light source driver 138 . The timing controller 132 can be used to process the input image data, and provide image display signals (such as data control signals, processed image data signals and gate control signals) to the gate driver 134 and the source according to the processed input image data. The driver 136 and at the same time provide control signals to the light source driver 138 so that the backlight module 120 can sequentially emit backlights of different colors, so as to cooperate with the driving of the liquid crystal molecules by the liquid crystal display panel 110 to display images.

FIG. 2 is a flow chart of steps of a driving method of a liquid crystal display device according to an embodiment of the present invention. Please refer to FIG. 2, the driving method of the liquid crystal display device 100 of the present embodiment may include the following steps: receiving the original grayscale data of the input image data (step S200); determining the first subframe in a frame according to the original grayscale data, The color of the second subframe and the third subframe (step S202); simultaneously convert the grayscale values of the first subframe, the second subframe and the third subframe into corresponding penetrations (step S204); according to each The penetration of the subframe is used to calculate the first turn-on time and the second turn-on time (step S206), wherein the first turn-on time is the turn-on time of the first light source 122 during the display period of the third sub-frame, and the second turn-on time is The opening time of the second light source 124 in the display period of the third subframe; during the display period of the first subframe, the first light source 122 is turned on, and the second light source 124 is turned on during the display period of the second subframe (step S208 ); during the display period of the third subframe, turn on the third light source 126, and simultaneously turn on the first light source 122 and the second light source 124 according to the calculated first turn-on time and second turn-on time (step S210); After calculating the first turn-on time, according to the calculated first turn-on time and second turn-on time, convert the original grayscale data into display grayscale data (step S212); and in the first subframe, the second subframe and the third subframe During the display period of the sub-frame, the converted display grayscale data is provided to the LCD panel 110 (step S214 ), so that the LCD panel 110 can display images in accordance with the lighting actions of different color light sources of the backlight module 120 .

FIG. 3 is a flowchart of steps of a driving method of a liquid crystal display device according to another embodiment of the present invention. Please refer to FIG. 2 and FIG. 3 at the same time. This embodiment is a further detailed method flow according to the embodiment in FIG. 2 . Wherein, steps S302 to S310 in this embodiment correspond to step S202 in FIG. 2 , steps S314 to S316 correspond to step S206 , and steps S318 to S322 correspond to step S212 . In step S200 , the driving device 130 of the liquid crystal display device 100 may receive the original grayscale data and the original turn-on time data in the input image data transmitted by the external system.

FIG. 4 is a schematic diagram of original grayscale data and original turn-on time data according to an embodiment of the present invention. Please refer to FIG. 3 and FIG. 4 at the same time. In step S200, the original grayscale data is provided by the input image data. At this time, the operation unit (not shown) of the driving device 130 can be used to calculate the turn-on time of each light source in the third sub-frame and the compensated display grayscale value according to the original grayscale data in the input image data.

FIG. 5 is a schematic diagram of judging the maximum gray scale value and the minimum gray scale value according to an embodiment of the present invention. Please refer to FIG. 3 and FIG. 5. In step S302, after receiving the original grayscale data, the maximum grayscale value R of each sub-frame (sub-frame) is judged among the original image grayscale values of one frame. _max , G _max and B _max and the minimum gray scale values R _min , G _min and B _min are used to determine the display period of the sub-frame used for color mixing (the display period Tb of the third sub-frame). As shown in Figure 5, taking the 3×3 pixel combination as an example, the maximum gray scale value R _max and the minimum gray scale value R _min of the red subframe R are 180 and 100 respectively, and the maximum gray scale value of the green subframe G is The value G _max and the minimum gray scale value G _min are 210 and 90 respectively, and the maximum gray scale value B _max and the minimum gray scale value B _min of the blue sub-frame B are 150 and 80 respectively. Wherein, if the grayscale value in the subframe is 0, or the maximum grayscale value and the minimum grayscale value (equal) of each subframe cannot be determined, then it is ignored and not considered.

As shown in FIG. 3 , in step S304 , the values of the color weight coefficients α, β and γ are set. The color weight coefficients α, β, and γ are weight coefficients corresponding to red, green, and blue respectively. Each color weight coefficient α, β, and γ is greater than or equal to 0 and less than or equal to 1, and can be adjusted according to the sensitivity of the human eye to each color. Make weight adjustments. For example, the human eye is most sensitive to green, so the color weight coefficient β of green can be the smallest. In this embodiment, for the convenience of description, the color weight coefficients α, β, and γ are set to be 1, but the present invention is not limited thereto.

As shown in Figure 3, in step S306, the first equation (βR _max /G _min +γR _max /B _min ), the second equation (αG _max /R _min +γG _max /B _min ) and the third equation are calculated respectively The values of (αB _max /R _min +βB _max /G _min ) correspond to the red subframe R, the green subframe G and the blue subframe B, respectively. For example, according to the maximum gray scale values R _max , G _max and B _max and the minimum gray scale values R _min , G _min and B _min of each subframe shown in FIG. 5 , and the color weight coefficient α respectively set to 1 , β and γ, it can be calculated that the calculated value of the first equation is 4.25, the calculated value of the second equation is 4.73, and the calculated value of the third equation is 3.17.

As shown in FIG. 4 , in step S308 , the minimum calculated values of the first equation, the second equation and the third equation are determined. In this embodiment, since the calculation value of the third-party program is the smallest, it means that the minimum gray scale values R _min and G _min of the red subframe R and the green subframe G are closest to the maximum gray scale value B _max , which also means that The red light source and the green light source can be turned on for a longer time during the turn-on period of the blue light source, so that the best color mixing effect can be achieved.

As shown in FIG. 4 , in step S310 , the colors of the first subframe, the second subframe and the third subframe are determined. First of all, since the calculated values of the first equation and the second equation are two larger values (the first value and the second value), the colors of the first subframe and the second subframe can be arbitrarily determined, for example: determine the color of the first subframe The color of one subframe is red, and the color of the second subframe is green, that is, the red subframe R is set as the first subframe, and the green subframe G is set as the second subframe. Wherein, the so-called random decision means that the order of the two larger values has nothing to do with the order of determining the colors of the first subframe and the second subframe. Secondly, since the calculated value of the third-party program is the smallest, the color of the third subframe can be determined to be blue, that is, the blue subframe B can be set as the third subframe for color mixing.

In other embodiments, if there is a larger value and two minimum values, the larger value is used as the first value to determine the color of the first subframe, and any one of the two minimum values is used as the second Binary value to determine the color of the second subframe, and the color of the third subframe is determined according to the other of the two minimum values.

In yet another embodiment, if there are three identical values, the color of the first subframe, the color of the second subframe and the color of the third subframe can be determined arbitrarily.

However, the present invention is not limited thereto. The third subframe used for color mixing is determined according to the grayscale value of each subframe in the image grayscale value of one frame. In other embodiments, according to different grayscale values of each subframe, the third subframe used for color mixing can also be a red subframe or a green subframe.

FIG. 6 is a schematic diagram of converting the gray scale values of the first subframe, the second subframe and the third subframe into transparency according to an embodiment of the present invention. Please refer to FIG. 3 and FIG. 6 at the same time. In step S312, the first subframe F1 (corresponding to red subframe R), the second subframe F2 (corresponding to green subframe G) and the third subframe F3 (corresponding to blue The grayscale value of the color sub-frame B) is converted into the transmittance of light penetrating the liquid crystal display panel 110 . Wherein, the penetration can be calculated or looked up in a table to obtain the penetration corresponding to the gray scale value. In this embodiment, the penetration corresponding to each gray scale value is obtained according to the Gamma 2.2 curve. For example, a grayscale value of 100 is converted to a corresponding penetration of 12.75% through a Gamma 2.2 curve, a grayscale value of 180 is converted to a corresponding penetration of 46.47% through a Gamma 2.2 curve, and so on. The penetration is shown in Figure 6.

More specifically, in step S312, the "simultaneously" refers to the conversion between the gray scale value and the transparency of each subframe during the period after step S310 and before the subsequent steps S314 and S318, and It is not a limitation that the conversion of each gray scale value and transmittance needs to be performed in parallel at the same time point. In other words, as long as during the period from the completion of step S310 to the start of execution of steps S314 and S318, regardless of whether the gray scale values of each subframe are converted sequentially one by one or synchronously in a multiplexed manner, the overall In terms of the step process, it can be regarded as simultaneously converting the grayscale values of the first subframe F1, the second subframe F2 and the third subframe F3 into corresponding transparency levels during this period. As for "simultaneously" in other steps, it is not limited here.

As shown in FIG. 3 , in step S314 , the on-time ratio of each light source in the third sub-frame F3 is calculated, that is, the first on-time ratio and the second on-time ratio are calculated. In this embodiment, the minimum penetration in the first subframe F1 (that is, the penetration (12.75%) corresponding to the gray scale value R _min ) is divided by the maximum penetration in the third subframe F3 ( That is, the penetration (31.12%) corresponding to the gray scale value B _max ), and the first opening time ratio (0.41) can be obtained; and the minimum penetration in the second subframe F2 (ie, the gray scale value G _min The corresponding penetration degree (10.11%) is divided by the maximum penetration degree (31.12%) in the third subframe F3, and the second opening time ratio (0.32) can be obtained. Among them, the first opening time ratio and the second The turn-on time ratios respectively indicate the turn-on time ratios of the first light source 122 (for example, a red light source here) and the second light source 124 (for example, a green light source here) in the display period Tb of the third sub-frame F3 .

As shown in FIG. 3 , in step S316 , the turn-on time of each light source in the third sub-frame F3 is calculated, that is, the first turn-on time and the second turn-on time are calculated. By multiplying the display period Tr of the first subframe F1 by the first turn-on time ratio, and multiplying the display period Tg of the second subframe F2 by the second turn-on time ratio, the first turn-on time Tbr and the second turn-on time ratio can be calculated. Time Tbg. In this embodiment, the preset display period of each subframe in a frame is the same as an example, that is, the preset display period Tr of the red subframe R is equal to the preset display period Tg of the green subframe G. The display period Tb of the blue sub-frame B, therefore, the first turn-on time Tbr of the first light source 122 is 0.41 times the display period Tb of the third sub-frame F3, and the second turn-on time Tbg of the second light source 124 is the third sub-frame F3. 0.32 times the display period Tb of the frame F3.

FIG. 7 is a schematic diagram of calculating brightness contributions of other colors in a third subframe according to an embodiment of the present invention. Please refer to FIG. 3 and FIG. 7 at the same time. In step S318, the luminance contribution of the first light source 122 and the second light source 124 in the display period Tb of the third sub-frame F3 is calculated according to the turn-on time ratio calculated in step S314. In this embodiment, the brightness contribution of the first light source 122 and the second light source 124 in the subframe used for color mixing is calculated by multiplying the transmittance corresponding to the third subframe F3 by the first The turn-on time ratio and the second turn-on time ratio can respectively obtain the luminance contributions of the first light source 122 and the second light source 124 in the display period Tb of the third sub-frame F3. For example, by multiplying the corresponding transmittance (31.12%) of a pixel in the blue subframe B by the first turn-on time ratio (0.41), it can be obtained that for the first light source 122 in the display period Tb of the third subframe, The brightness contribution (12.75%) provided by this pixel. Similarly, by multiplying the corresponding transmittance (31.12%) of the same pixel in the blue subframe B by the second turn-on time ratio (0.32), the display period Tb of the second light source 124 in the third subframe F3 can be obtained. The luminance contribution (9.96%) provided by this pixel in .

FIG. 8 is a schematic diagram of calculating the compensated penetration according to an embodiment of the present invention. Please refer to FIG. 3 and FIG. 8 at the same time. In step S320, the compensated penetration is calculated. At this time, the brightness provided by the first light source 122 and the second light source 124 in the display period Tb of the third subframe F3 is subtracted from the transmittance corresponding to each pixel of the first subframe F1 and the second subframe F2 Contribution to keep the sum of each light's brightness constant for this frame. For example, the corresponding transmittance (12.75%) of a pixel in the red subframe R is subtracted from the luminance contribution (12.75%) provided by the first light source 122 to this pixel in the display period Tb of the third subframe F3, and It can be obtained that the penetration should be displayed as 0%. Similarly, the corresponding transmittance (65.23%) of a pixel in the green subframe G is deducted from the luminance contribution (9.96%) provided by the second light source 124 to this pixel in the display period Tb of the third subframe F3, And the penetration that should be displayed is 55.27%.

FIG. 9 is a schematic diagram of converting the compensated transmittance into grayscale values according to an embodiment of the present invention. Please refer to FIG. 3 and FIG. 9 at the same time. In step S322, the compensated transparency in the first subframe F1 and the second subframe F2 is converted into a compensated gray scale value by calculation or table look-up. For example, in this embodiment, the deducted transmittance is converted back to the grayscale value through the Gamma 2.2 curve, and the display grayscale value of each subframe can be obtained, that is, the display grayscale data can be obtained, wherein the first grayscale value used for color mixing The grayscale values of the three sub-frames F3 (such as the blue sub-frame B) remain unchanged. For example, the corresponding displayed transmittance (0%) of a pixel in the red subframe R is converted back to a grayscale value (0), which is the display grayscale value that this pixel should display in the red subframe R. Similarly, the display transparency (55.27%) corresponding to the pixel of the green subframe G is converted back to the grayscale value (194), which is the display grayscale value that this pixel should display in the green subframe.

FIG. 10 is a schematic diagram of driving a light source in one frame by a liquid crystal display device according to an embodiment of the present invention. Please refer to FIG. 3 and FIG. 10 at the same time. After steps S316 and S322, that is, after obtaining the turn-on time of each light source in the third subframe F3 and the compensated display gray scale value, the driving device 130 can The liquid crystal display panel 110 and the backlight module 120 are driven according to the display gray scale value and the turn-on time of each light source. For example, the timing controller 132 of the driving device 130 can provide the original turn-on time data and the turn-on time data of each light source in the third sub-frame F3 to the light source driver 138, and the timing controller 132 can provide the compensated display gray scale value to Gate driver 134 and source driver 136 . Therefore, in steps S208, S210, and S214, the liquid crystal display panel 110 can display the compensated gray scale value, and the backlight module 120 can sequentially turn on different color light sources in different sub-frames, and Multiple light sources of different colors are simultaneously turned on in the third subframe F3. At the same time, the liquid crystal display panel 110 can cooperate with the lighting action of the backlight module 120 on the first light source 122 , the second light source 124 and the third light source 126 according to the display gray scale value, and display color images correspondingly.

Therefore, the driving method of the liquid crystal display device 100 of this embodiment can determine the sub-frame used for light mixing and the turn-on of each light source in the sub-frame used for light mixing in each frame according to the gray scale value of the input image. time, and at the same time correspondingly adjust the grayscale value of the original input image corresponding to the turn-on time of the light source, so that the liquid crystal display panel 110 can adjust the grayscale value of the image in conjunction with the lighting action of the backlight module 120, so as to maintain the grayscale value of the liquid crystal display device 100 Displayed images are displayed with consistent brightness and improved color break-up (CBU) at the same time. Furthermore, the driving method of the liquid crystal display device 100 of this embodiment can achieve the effect of improving the color separation phenomenon without adding additional hardware and without sacrificing the color saturation of the image, so that the product cost and display performance of the liquid crystal display device can be ensured at the same time. quality.

FIG. 11 is a flowchart of steps of a driving method of a liquid crystal display device according to yet another embodiment of the present invention. In this embodiment, the steps described are roughly the same as the embodiment in Figure 3, the difference between the two is that this embodiment further adjusts the compensated penetration, and then adjusts the adjusted penetration Convert to grayscale values (steps S1122 to S1128). In the following, only the differences between this embodiment and the embodiment in FIG. 3 will be described, and the similarities will not be repeated here.

FIG. 12 is a flow chart of steps for adjusting the penetration of the first subframe and the second subframe according to the penetration ratio according to an embodiment of the present invention. Please refer to FIG. 11 and FIG. 12 at the same time. Compared with the embodiment in FIG. 3 , the driving method of the liquid crystal display device in this embodiment can further adjust the grayscale value of the displayed image in each frame to reduce the number of first light sources 122 and the second light source 122. The turn-on time of the two light sources 124 in their corresponding subframes (such as the first subframe F1 and the second subframe F2 ) reduces the light source power consumption of the backlight module 120 . In detail, after the step 320 of calculating the compensated penetration is performed, in step S1122, the maximum penetration of the compensated penetration of the first subframe F1 and the second subframe F2 is adjusted is the maximum critical penetration (100%), and according to obtain the corresponding penetration ratio. Next, in step S1124 , the compensated remaining penetrations in the first subframe F1 and the second subframe F2 are adjusted in equal proportions according to the obtained penetration ratios. For example, the compensated maximum penetration (43.27%) in the first subframe F1 (red subframe) is adjusted to the maximum critical penetration (100%), and the penetration ratio (2.31) can be obtained according to this adjustment , that is, the maximum penetration (43.27%) of the first subframe F1 is multiplied by the penetration ratio (2.31) to obtain the maximum critical penetration (100%). Next, the other transparency levels in the first sub-frame F1 are adjusted proportionally according to the penetration level ratio (2.31). Similarly, the second subframe F2 (green subframe) is also processed in the same way, for example: the penetration ratio (1.81).

FIG. 13 is a schematic diagram of converting the adjusted transmittance into grayscale values according to an embodiment of the present invention. Please refer to FIG. 11 and FIG. 13 at the same time. In the subsequent step S1126, the adjusted penetration in the first subframe F1 and the second subframe F2 is converted back to The gray scale value is such that the maximum gray scale value in the first sub-frame F1 and the second sub-frame F2 can be adjusted to a critical gray scale value (for example, 255).

FIG. 14 is a schematic diagram of driving a light source in one frame by a liquid crystal display device according to another embodiment of the present invention. Please refer to FIG. 12 and FIG. 14 at the same time. In the subsequent step S1128, the turn-on time of the first light source 122 and the second light source 124 in their corresponding subframes is shortened according to the transmittance ratio obtained in step S1122, that is, the first A display period between a sub-frame F1 and a second sub-frame F2. For example, the adjusted transmittance in the first sub-frame F1 (red sub-frame) is converted back to a grayscale value to be provided to the liquid crystal display panel 110 for display. Next, divide the turn-on time of the first light source 122 in the first subframe F1 (that is, the preset display period Tr of the first subframe F1) by the corresponding transmittance ratio (2.31) to obtain the first light source The display on time of 122 in the first sub-frame F1 (that is, the display period Tr/2.31 of the new first sub-frame F1 ), thus shortening the on time of the first light source 122 . For another example, the adjusted transparency in the second sub-frame F2 (green sub-frame) is converted back to a grayscale value, which is provided to the liquid crystal display panel 110 for display. Next, divide the turn-on time of the second light source 124 in the second subframe F2 (that is, the preset display period Tg of the second subframe) by the corresponding transmittance ratio (1.81) to obtain the second light source 122 The display on time in the second sub-frame F2 (that is, the display period Tg/1.81 of the new second sub-frame F2 ) thus shortens the on-time of the second light source 122 .

FIG. 15 is a schematic diagram of driving a light source in one frame by a liquid crystal display device according to another embodiment of the present invention. In this embodiment, the driving method of the liquid crystal display device can generally refer to the embodiment shown in FIG. 3 and FIG. 11, so only the differences between this embodiment and the embodiment shown in FIG. 3 and FIG. It will not be repeated here. Please refer to FIG. 15 , compared with the driving method in FIG. 3 , the driving method of the liquid crystal display device of this embodiment can further uniformize the first turn-on time Tbr and the second turn-on time Tbg of the first light source 122 and the second light source 124 respectively. within the display period Tb of the third subframe F3 (in the display period Tb of the third subframe F3, the time for turning on the first light source 122 and the second light source 124 is evenly distributed with a preset frequency), so as to slow down Color separation phenomenon (CBU), that is, in the display period Tb of the third subframe F3, the first turn-on time Tbr and the second turn-on time Tbg are divided into a plurality of short turn-on times, and the short turn-on time have the same or different intervals between them. For example, in the display period Tb of the third subframe F3, the light source driving waveform signals of the first light source 122 and the second light source 124 are converted into a plurality of pulse (pulse) signals, or the display in the third subframe F3 During the period Tb, the light source driving waveform signals of the first light source 122 and the second light source 124 are converted into a plurality of short-wavelength signals, which are dispersed in the display period Tb of the third sub-frame F3 to further improve color separation.

Those skilled in the art can understand that all or part of the processes in the methods of the above embodiments can be realized through computer programs and hardware related to executing instructions, and the programs for executing the methods of the embodiments of the present invention can be stored in computer storage media , when the program is executed, it may include the procedures of the embodiments of the above-mentioned methods. Wherein, the above-mentioned storage medium may be a magnetic disk, an optical disk, a read-only memory (Read-Only Memory, ROM) or a random access memory (Random Access Memory, RAM), etc., and the present invention is not limited thereto.

To sum up, the driving method of the liquid crystal display device according to the embodiment of the present invention can adjust the gray scale value of the displayed image and the turn-on time of each light source in the mixed light sub-frame in each frame according to the gray scale value of the input image, so as to Improve color separation. Moreover, the driving method of the liquid crystal display device according to the embodiment of the present invention can achieve the effect of improving the color separation phenomenon without adding additional hardware and without sacrificing the color saturation of the image, thereby ensuring the product cost and display performance of the liquid crystal display device at the same time. quality.

Although the present invention has been disclosed as above with the embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the technical field can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims (16)

1. a driving method for liquid crystal indicator, including:

Receive original gray-scale data of an input image data；

Determine one first subframe, one second subframe and the color of one the 3rd subframe according to these original gray-scale data, wherein this One subframe, this second subframe and the 3rd subframe include multiple grey decision-making respectively；

Change those of those grey decision-making of this first subframe, those grey decision-making of this second subframe and the 3rd subframe simultaneously Grey decision-making is corresponding multiple penetrations；

One first opening time and one second opening time is calculated according to those penetrations；

According to this first opening time and this second opening time, change these original gray-scale data into a display luma data；

During the display of this first subframe, open one first light source, and during the display of this second subframe in, unlatching one Secondary light source；

During the display of the 3rd subframe, open one the 3rd light source, and simultaneously according to this first opening time with this second Opening time is separately turned on this first light source and this secondary light source；And

During the display of this first subframe, this second subframe and the 3rd subframe, it is provided that this display luma data is to one Display panels.

The driving method of liquid crystal indicator the most according to claim 1, wherein determining according to these original gray-scale data should The step of the color of the first subframe, this second subframe and the 3rd subframe includes:

Judge the maximum gray value of the red sub-frame in these original gray-scale data, a green sub-frame and a blue subframes with Little grey decision-making.

The driving method of liquid crystal indicator the most according to claim 2, wherein determining according to these original gray-scale data should The step of the color of the first subframe, this second subframe and the 3rd subframe also includes:

Set one first color weight coefficient, one second color weight coefficient and a third color weight coefficient.

The driving method of liquid crystal indicator the most according to claim 3, wherein determining according to these original gray-scale data should The step of the color of the first subframe, this second subframe and the 3rd subframe also includes:

Calculate a first party formula (β R_max/G_min+γR_max/B_min), wherein this first party formula corresponds to this red sub-frame；

Calculate a second party formula (α G_max/R_min+γG_max/B_min), wherein this second party formula corresponds to this green sub-frame；With And

Calculate third party's formula (α B_max/R_min+βB_max/G_min), wherein this third party's formula corresponds to this blue subframes,

Wherein, R_max、G_maxAnd B_maxIt is respectively this red sub-frame, this green sub-frame and this blueness in these original gray-scale data The maximum gray value of subframe, R_min、G_minAnd B_minBe respectively this red sub-frame in these original gray-scale data, this green sub-frame with And the minimum gray value of this blue subframes, α, β and γ be respectively this first color weight coefficient, this second color weight coefficient and This third color weight coefficient.

The driving method of liquid crystal indicator the most according to claim 4, wherein determining according to these original gray-scale data should The step of the color of the first subframe, this second subframe and the 3rd subframe also includes:

According to this first party formula, this second party formula and the result of calculation of this third party's formula, it is judged that this first party formula, This second party formula and one first value of this third party's formula, one second value and a minima.

The driving method of liquid crystal indicator the most according to claim 5, wherein determining according to these original gray-scale data should The step of the color of the first subframe, this second subframe and the 3rd subframe also includes:

The color of this first subframe and this second subframe is determined respectively according to this first value and this second value；And

The color of the 3rd subframe is determined according to this minima.

The driving method of liquid crystal indicator the most according to claim 6, wherein according to those penetrations calculate this first Opening time includes with this second open-interval step:

By the minimal penetration degree of this first subframe divided by the maximum penetration degree of the 3rd subframe, to calculate one first opening time ratio Example；And

By the minimal penetration degree of this second subframe divided by the maximum penetration degree of the 3rd subframe, to calculate one second opening time ratio Example.

The driving method of liquid crystal indicator the most according to claim 7, wherein according to those penetrations calculate this first Opening time also includes with this second open-interval step:

This first opening time ratio will be multiplied by, to calculate this first opening time during the display of this first subframe；And

This second opening time ratio will be multiplied by, to calculate this second opening time during the display of this second subframe.

The driving method of liquid crystal indicator the most according to claim 8, wherein changing these original gray-scale data is that this shows Show that the step of luma data includes:

Those penetrations of 3rd subframe are multiplied by this first opening time ratio to calculate this first light source at the 3rd son Brightness contribution shared in during the display of frame, and those penetrations of the 3rd subframe are multiplied by this second opening time ratio Example with calculate this secondary light source during the display of the 3rd subframe in shared brightness contribution.

The driving method of liquid crystal indicator the most according to claim 9, wherein changing these original gray-scale data is that this shows Show that the step of luma data also includes:

Those penetrations of this first subframe and those penetrations of this second subframe are deducted respectively this first light source with this Two light sources during the display of the 3rd subframe in shared brightness contribution, to calculate this first subframe with this second subframe through mending Those penetrations after repaying.

The driving method of 11. liquid crystal indicators according to claim 10, wherein changes these original gray-scale data for being somebody's turn to do The step of display luma data also includes:

This first subframe is converted into those grey decision-making after compensating with this second subframe those penetrations after compensated, with Obtain this display luma data.

The driving method of 12. liquid crystal indicators according to claim 10, wherein changes these original gray-scale data for being somebody's turn to do The step of display luma data also includes:

According to a penetration ratio of this first subframe Yu this second subframe, after compensated to this first subframe and this second subframe Those penetrations in maximum penetration degree be adjusted to maximum critical penetration degree respectively；And

By remaining those penetration of this first subframe and this second subframe respectively in accordance with this first subframe and this second subframe This penetration ratio is adjusted.

The driving method of 13. liquid crystal indicators according to claim 12, wherein changes these original gray-scale data for being somebody's turn to do The step of display luma data also includes:

This first subframe is converted into those grey decision-making after compensating with this second subframe those penetrations after adjusted, with Obtain this display luma data.

The driving method of 14. liquid crystal indicators according to claim 13, in these original gray-scale data of conversion be wherein After the step of this display luma data, this driving method also includes:

According to this penetration ratio of this first subframe Yu this second subframe, shorten the display of this first subframe and this second subframe Period.

The driving method of 15. liquid crystal indicators according to claim 14, wherein according to this first subframe with this second This penetration ratio of subframe, the step during shortening this first subframe and the display of this second subframe includes:

This being respectively divided by this first subframe and this second subframe during this first subframe and the display of this second subframe is penetrated Degree ratio, with shorten this first subframe and this second subframe display during.

The driving method of 16. liquid crystal indicators according to claim 14, wherein during the display of the 3rd subframe In, open the 3rd light source, and be separately turned on this first light according to this first opening time and this second opening time simultaneously Source includes with the step of this secondary light source:

In this first opening time and this second opening time being homogeneously dispersed in respectively during the display of the 3rd subframe.