TWI289695B - Liquid crystal display device with a function of adaptive brightness intensifier and method for driving same - Google Patents

Abstract

A liquid crystal display device is provided with a timing control unit to control the brightness of a backlight. The timing control unit divides the data for the respective RGB colors into three or more gray scale groups, counts the number of the data for the respective RGB colors in each gray scale group per one picture frame, comparing the counted numbers with each other, and outputs the brightness control signals to the backlight driving unit depending upon the compared values. The timing control unit applies high driving voltages to the backlight driving unit to increase the brightness of the backlight when the compared values per one picture frame are in the high gray scale level, and applies normal driving voltages to the backlight driving unit to keep the brightness of the backlight to be in a normal state when the compared values per one picture frame are in the low gray scale level. That is, in the case of the display screens locally intensified at the high gray scale (or requiring high contrast ratio), or the display screens bearing wholly the high gray scale (or requiring high brightness), the brightness of the backlight is increased. In the reverse case, the brightness of the backlight is kept to be in a normal state. In this way, the desired high contrast ratio is obtained.

Description

1289695 V. INSTRUCTION DESCRIPTION (1) BACKGROUND OF THE INVENTION (a) Field of the Invention The present invention relates to a liquid crystal display device and a method of driving the same, and more particularly to a liquid crystal display device having an adaptive brightness enhancer function for display The image adapts to the brightness of the backlight. (b) Description of the Related Art In the cold cathode fluorescent lamp (CCFL) which is used as an illumination source for liquid crystal display devices, the brightness system is inversely proportional to the service life. In other words, when the high current is driven to increase the brightness, the life of the CCFL is shortened. Conversely, as low power, the brightness is reduced when the drive is extended for a longer life. However, the high brightness and the use of both features are important factors in the practical application of liquid crystal display devices. - In order to cope with such a demand, a technique of widening the luminance characteristics of a display device and using an effective range has been proposed. The normal display screen is driven by the normal brightness 'but the high current is temporarily applied to the backlight when the display surface particularly requires high brightness. At the same time, in the liquid crystal display device, the amount of current driven by the device is changed depending on the image to be displayed. For example, in the normal white mode, where the liquid crystal molecules are redirected in the direction of the electric field under the condition that the voltage is applied and the light is incident thereon, the more the number of bright pixels is, the power consumption of the device is reduced; but the number of dark pixels The more the device, the higher the power consumption of the device. Considering this feature, it has been proposed that the current value of the backlight should be determined according to the power consumption of the device. However, this technique involves a problem in that additional circuitry is required to detect the power consumption of the device and to change the detection value so that it is suitable for backlighting the inverter.

V. Description of the invention (2) The variable range of the control signal. In addition, since the brightness control is required for all the display screens, the comparison of the loading is only required to increase the brightness of the kneading control. MAN JQ is an object of the present invention to provide a liquid crystal brightness enhancer function for controlling backlight brightness according to each _ 1, 5 £, with adjustment. The gray scale method of the image data to be displayed is controlled by the gray scale of the image data displayed by the crystal display device; the light moon ^ can be displayed according to each frame and other purposes. The liquid crystal display device having the foregoing features is characterized in that, according to a characteristic aspect of the present invention, the liquid crystal unit is composed of an individual RGB color data detecting device, and includes a meter control screen, and the output brightness control is high. Light is generated at a predetermined backlight driving voltage. The backlight 2c is applied to the high level brightness control of the timing control unit _ = ^ received from the backlight to the backlight, or the output low potential drive "two ί: the south potential drive electric liquid crystal display device further includes a month - data driver its output Image signal 2 and a scan signal,

The Si is provided with a plurality of gate lines carrying a scanning signal 'crystallized in the pixel region, and is connected to the closed line = number' switch element to be connected to the switching element and the response switch. The element is 3 2 f 1 1 . LCD panel system 1289695 V. Description of the invention (3) Displaying image signals according to driving of the backlight The timing control unit controls the brightness level of each frame. Timing Control Sheet - divides individual RGB color data into three or more grayscale groups, 'times each frame's individual RGB color data in each grayscale group, compares the counts with each other, and based on the comparison value, Output brightness control signal to backlight drive early 疋 ° timing control unit applies high drive voltage to the backlight drive unit to report the comparison value of each frame is high gray level, improve backlight brightness, to ^: two positive: drive voltage To the backlight drive unit, each frame: the comparison value is maintained at a low gray level to maintain the backlight brightness in a normal state. Another characteristic aspect of the 曰Γ康Γ明,, 16 crystal display; the device includes - sheet liquid = line and form a pixel line in a matrix form and the pixel electrode is connected to the switch element = line: and the data line, which is set in the liquid Off...actuation; and the liquid crystal display device is applied to the boat to apply force, and the image data is detected by the second book, which is located on the outside and controls the level of the liquid crystal display panel to give the liquid crystal display surface. And the S-mover outputs a scanning signal display panel. , light drive single out 'image signal to LCD display from the timing control list: ^ 'voltage to the backlight 接收 to receive the brightness of the panel ^ ^ degree control signal level when the liquid crystal display port 10 w control unit control an ancient _Color data 2222 delete ^ \ 灰 gray scale group, counted at 1296965 V. Invention description (4) The number of individual RGB color data of each grayscale group of each frame, compare the individual number, and According to the comparison value, the brightness control signal is output to the north end 1^^, and the mouth and month drive the early element. The timing control unit applies a high driving voltage to the backlight driving unit to increase the brightness of the backlight when the comparison value and the high gray level of each frame are increased, and the normal driving voltage is applied at a low gray level when the comparison value of each frame is lower. The backlight driving unit 俾 maintains the backlight brightness in a normal state. According to still another feature of the present invention, a liquid crystal display device includes a liquid crystal display module with a liquid crystal display panel and a backlight, a gate driver that outputs a scan signal to the liquid crystal display panel, and a data driver that outputs image data. Give the LCD panel. A method of driving a liquid crystal display device, first, gray scale data of individual RGB colors is equally divided into three or more gray scale groups, and the number of gray scale data counted for each group of individual RGB colors. Second, check whether the number of grayscale data in the highest grayscale and the group exceeds the predetermined ratio of the total grayscale data. If the combination of the first step is yes, then the third is to check whether the number of grayscales in the darkest grayscale group exceeds the predetermined total grayscale data ratio. If the third step is 'fourth', the backlight brightness is increased while the gray level of the low gray level data is further lowered. According to still another feature of the present invention, a liquid crystal display device includes a liquid helium display module with a liquid crystal display panel and a backlight, a gate driver that outputs a scan signal to the liquid crystal display panel, and a data driver output image thereof. Signal to the LCD panel. A method for driving a liquid crystal display device, first, the gray scale data of the individual r G B colors is equally divided into a high brightness level group A and a medium brightness level group B.

Page 9 1289695 V. Invention Description (5) " Low 7C degree group C, counting the number of grayscale data for each group of individual RGB colors. First, check if A/(A + B + C) exceeds 〇〇8 and C/A exceeds f, and if yes, then control the backlight to make the all white brightness turn to the first bright ς = right to the second step If not, then third, check that a/(a + b + c) is = over 0.05 and C/A exceeds 10, and if yes, then control back === into: second brightness level, stomach The second brightness level is high =: two = two steps are no, then check Α / (_. 疋 no more than 0.03 and C / A is more than 2 〇, to = all in the third brightness level, the first The system is full: bright two becomes;; Κ: for: the first i, the backlight is controlled to the first - brightness level. Soap the fourth brightness level is low. In the structure, the backlight brightness is controlled according to the image data. Therefore, a higher contrast ratio is obtained. 丨 丨 冤Μ 冤Μ 准 , , , , ^ ^ ^ ^ 完整 完整 完整 完整 完整 完整 完整 完整 完整 完整 完整 完整 完整 完整 完整 完整 完整 完整 完整 完整 完整 完整 完整 完整 完整 完整A similar reference to delivery denotes the same or similar components, and in the drawings: a block diagram of a liquid crystal display device with a stolen function according to a preferred embodiment of the present invention; Is a diagram for explaining the image information on the number of people as a means of the shown in FIG. I function from the liquid crystal display; :: the step of, means for controlling backlight luminance L f Wang FIG β brother out of the liquid crystal display 1 shown in FIG.

Page 10 1289695 V. Description of the Invention (6) Figure 4 is a line diagram illustrating the change of brightness to the liquid I white shown in Figure 1 after the crystal display device is replaced; Grayscale adjustment. ^, the night crystal display device considers the brightness of the backlight to change the charm. With the help of the singer, the details of the rabbit will be described with reference to the accompanying drawings. FIG. 1 illustrates a liquid crystal display device according to the invention of the second body (10) ^ enhancer function. The brightness of the embodiment is as shown in FIG. 1 . The night crystal-liquid crystal display surface includes the liquid crystal display module 10. 'With a liquid crystal display module and an assembly for driving 3 . . - data = two T timing control unit 200, - gate driver and - gray level mine factory is 40, a backlight driving unit 50 0 is an inverter to ^ 电压 voltage generator 600. Extreme '. ^^板11 〇 includes mx η pixels arranged in a matrix form to “ίΓ: voltage of the drive 30° or scan tank ^ cry 400 times: pheno, β pixel pixel system responds to data driven The predetermined image "^ ', , is generated by the light from the backlight 1 20 and displayed on the screen. The time unit f〇〇 includes data. The counting unit 210, the first adding unit @1 adding unit 230, the comparator 205, the memory controller 250, and the jAM unit 260. The gray scale data of the individual RGB colors of each frame is divided into two sets of gray scale groups and When the counted frame contains image data having a bright gray scale, the timing control unit 200 applies a higher driving voltage than the normal driving voltage to the backlight.

1289695

The driving unit 500 increases the brightness. When the counting frame contains image data with a dark gray level, the timing control unit 2000 applies a normal driving voltage to the backlight driving unit 5 to maintain the backlight brightness in a normal state, and controls the application to the liquid crystal display mode. Group 1 灰 gray scale voltage, so the brightness level must be reduced.

- In particular, the material counting unit 210 includes an R data counting unit 212, a G = material counting unit 214, and a B data counting unit 216. The rGB data counter units 212, 214, and 216 each include a data discriminator, first and second counts, and first and second adders. The data counting unit 2 counts the number of grayscale data for the individual RGB colors of the related images received from the external graphics controller (not shown). The data counting unit 21 counts the number of high grayscale data for the individual rgb colors R3, G3, and B3 of the image, and outputs the counted number to the first adding unit 220. The data counting unit 21 counts the number of low grayscale data for each of the R G B colors R1, G1, and B1 of the image, and outputs the counted number to the second adding unit 2300. For example, the R data counting unit 2 1 2 includes a data discriminator 2 1 2 - 1, a first counter 21 2-3, a second counter 21 2-5, a first adder 21 2-7, and a second adder 2 1 2 - 9.

The data discriminator 21 2-1 checks the gray scale of the received R data. When the check level is high, the data discriminator 2 1 2 -1 sends the high gray scale R data to the first counter 21 2-3, and when the check gray scale is low, the data discriminator 212 - ι will be low The gray scale R data is sent to the second counter 21 2-5. The first counter 21 2-3 counts the received high gray scale r data, and sends the counted number to the first adder 212-7. Second counter 212-5 count

Page 12 1289695 DESCRIPTION OF THE INVENTION (8) The received low gray scale R data, and the counted number is sent to the second adder 2 1 2 - 9. The first adder 21 2-7 sums up the number of high gray scale R data received by each frame in response to the vertical synchronizing signal Vsync, and outputs the sum number to the first adding unit 2 2 0. The second adder 2 1 2 - 9 responds to the vertical sync signal Vsync by summing the number of low gray scale r data received by each frame, and outputting the sum to the second adding unit 2 3 0 . The first adding unit 22 0 receives the number of high grayscale data of the individual RGB colors, adds the number of data received by the parent frame, and sends the sum to the comparator.

240. The second adding unit 203 receives the number of low grayscale data of the individual rGB colors, adds the received data number of each frame, and sends the sum to the comparator 240. Comparator 240 compares the number of data received by individual high grayscale RGB colors with the number of individual data per frame of low grayscale RGB colors. When the number of data of the high grayscale RGB color is relatively larger than the number of data of the individual low grayscale RGB colors, the comparator 240 outputs the brightness control signal 241 to the backlight driving unit 500, so the backlight driving unit 5 〇〇 Apply a high driving voltage to the backlight 1 20 俾 to increase the brightness. In contrast, the comparator 24 outputs the brightness control signal 241 to the backlight driving unit 50, so that the backlight driving unit 5 applies a normal driving voltage to the backlight 1 2 to maintain the brightness in a normal state. . When a normal driving voltage is applied, the comparator 24 输出 also outputs the brightness control signal 2 4 1 to the memory control unit 2 5 〇, so the gray scale of the low gray scale data is further reduced to compensate for the increase in backlight brightness. €Recall control unit 2 5 0 receives from the graphics controller (not shown)

Page 13 1289695 V. Individual RGB data of the invention (9), and send it to the SRAM unit 260. For example, in the case of displaying image data of a predetermined range, the memory control unit 25 extracts lower grayscale RGB data R', G', and B from the ROM 2 5 5 and outputs the same to the SRAM unit 260 to compensate for the brightness of the backlight 120. The rise. The ROM 255 used as a look-up table lut can be installed on the outside or inside of the a-day control of the early 20th. The SRAM cell 260 includes a first SRAM 261 to store R data from the memory control unit 250, a second SRAM 264 to store G data, and a third SRAM 266 to store B data. SRAM unit 260 receives the lower grayscale RGB data R, G, and B from memory control unit 250, and sends the adapted RGB data RA, GA, and BA to data driver 4. When the brightness control signal 241 from the comparator 240 is tied to the low gray level, the memory control unit 250 outputs the brightness control signal 251 to the gray level voltage generator 600, so the gray of the low gray level data The gradation further reduces the increase in brightness of the compensated backlight. The ash white voltage generator 600 is synchronized with the R from the external graphics controller (the number of elements of the JB data is synchronized to generate the gray scale voltage, and the voltage is applied to the data drive benefit 400. The gate driver 30 0 opens the path for guidance The data from the data driver = 0 to the pixel. Of course: when the brightness control signal 251 causes the low gray level batch it gradation to further decrease and the brightness control signal 251 is from the memory element 25. When inputting, the gray scale voltage generator 6. 〇 produces a grayscale voltage lower than the normal grayscale voltage, and outputs to the data drive write 4〇〇. The source driver 4〇0 receives the adaptation from the timing control unit 200=“咖,” and stores The data is in the shift register (not shown in the figure). When the received signal L0AD indicates the supply of data to the liquid crystal display surface

Page 14 1289695 V. INSTRUCTIONS (10) When the board is 11 0, the data driver 4 〇 〇 selects the relevant voltage of the individual data and transmits the data to the liquid crystal display panel 1 1 〇. As described above, when the backlight of the liquid crystal display device is driven, when the screen has a high gray scale enhancement (or a high contrast ratio is required), or when it is required to display a screen with all high gray scales (or high brightness), the backlight brightness Increase. In the opposite case, the backlight brightness is maintained in a normal state. In this way, the contrast ratio can be increased. Figure 2 is a line graph showing the number of data in grayscale. As shown in Figure 2, the grayscale distribution of the image is easy to calculate, calculated by counting the number of data with a predetermined grayscale (for example, 4 5 / 6 4 ) or more and counting with another gray scale (for example, 32 /64) or the following number of materials and compare them. The 45/64 gray scale and the 32/64 gray scale indicate that when the gamma value is 2, the brightness is compared with the highest luminance of 1/2 and 1/4. 3 is a flow chart showing the brightness control step of the liquid crystal display device shown in FIG. 1 as an example, when the number of data with gray scale 45/64 or more is 5% or more, or 3% or more, and the ratio is When the number of grayscale 32/64 or more is more than ten times or more, the brightness of the backlight is increased and the gray level of the low gray level is further decreased. As shown in FIG. 3, the gray scale data of the related image is divided into an array, and each count is counted. The number of grayscale data for the group (S1 00). Group A covers data with grayscale 45/64 or negative, Group B covers data with grayscale in the range of 4 5 / 6 4 to 3 2 / 6 4, and Group C covers data with grayscale 3 2 / 6 4 or below. . It is then checked whether A/(A + B + C) exceeds 0.08 and C/A exceeds 5 (S20 0 ). If yes, the backlight lamp current or switch operation ratio is fully controlled.

Page 15 1289695 V. Description of invention (11) White brightness is 300 nits or turbidity/square meter (S2 1 〇), and the gray scale of low gray scale data becomes further reduced (S 2 2 0 ) . In the case where S2 0 0 does not satisfy the above conditions, it is checked whether a/(a + B + C) exceeds 0.05 and C/A exceeds i 〇 (s30 0 ). If so, the backlight current or switching operation ratio is controlled to a full white luminance of 450 nits (S 3 1 0 ), and the gray scale of the low gray scale data is further lowered (S320).

In the case where the condition of the above S30 0 is not satisfied, it is checked whether a/(A + B + C) exceeds 0.03 and whether C/A exceeds 20 (S4 00 ). If so, the backlight current or switching operation ratio is controlled to a full white luminance of 60 nits (S41 0), and the gray scale of the low gray scale data is further lowered (S420). In the case that the condition of the foregoing S40 0 is not satisfied, the backlight current or the switching operation ratio is controlled to have a full white luminance of 200 nits (S510), and the gray scale of the low gray scale data is further lowered (S 5 2 0 ). As mentioned above, the grayscale data of the relevant image is divided into Group A with grayscale 45/64 or above, Group B with grayscale in the range of 45/64 to 3 2 /64 and with grayscale 32/64 Or Group C below and count the number of gray levels for each group. The number of grayscale data of the three groups is compared with each other, and the backlight brightness is controlled according to the comparison result.

In the actual liquid crystal display panel, when the brightness of the backlight is increased, the brightness of the pixel with a low gray level is also improved. Therefore, the gray scale of the low gray scale must be further lowered to maintain the same brightness as in the case where the backlight brightness is not increased. Only with this kind of compensation can the actual dynamic range of the backlight be fully expanded. Figure 4 is a line graph illustrating the function of grayscale changes in brightness before or after adjustment. The figure shows that the backlight brightness is adjusted to 200 nits and 450 nit panel brightness, respectively.

1289695 V. Invention Description (12) ^ --------- As shown in Figure 4, although the backlight brightness is thumb. 9-direction, but maintain normal in low gray level. Figure 5 is a line graph showing the brightness as the back is as shown in Figure 5. The bright part becomes more A hr tt X Θ正七^ is the moon 売 ' while maintaining the dark part of the same The shell degree can significantly increase the contrast ratio of the image display. In other words, the contrast ratio of 20 nits is 35 〇 _ 4 〇〇 : 丨, but the effective contrast ratio of 奋 显示 昼 is about J 〇 〇 i : i. If you don't have a simple stomach. The I5 injury image data is enhanced by high gray level, and most of the image data is enhanced by low f-order. The brightness of the backlight is required to increase the image of the southerly gray image in a significant way. At the same time, the low-gray image resource: the degree of step-down is reduced to compensate for the increase in backlight brightness. Conversely, in the case where the gray scale of the image data is evenly distributed, the Rayleigh is consumed from the brightness. There is no need to increase the brightness control signal to the backlight drive unit by simply operating the digital data. No separate circuit is required and no additional manufacturing cost is involved. 0 As explained above, first check the RGB of each frame. The gray level voltage level of the data and the brightness based on the gray level voltage level. In the case of high brightness levels, the backlight brightness is controlled to a higher brightness level than the normal brightness of t匕. Conversely, in the case of low-brightness levels, the backlight brightness is maintained at the normal brightness while the gray level of the low-gradation data is further lowered, thus increasing the contrast ratio. In other words, the high-gray scale enhancement (or high contrast ratio) is displayed locally, or the display screen has a high gray level (or high brightness), and the backlight is increased. In the opposite case, the backlight brightness is maintained in a normal state.

1289695 V. Description of invention (13) State. In this way, the contrast ratio is increased. While the invention has been described with reference to the preferred embodiments thereof, it is understood that the invention may be modified and substituted without departing from the spirit and scope of the invention as set forth in the appended claims.

Page 18 1289695

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Claims (1)

1289, 5 case number, 〇21〇1々々/月曰曰6, application patent scope 1 · A requirement for a crystal display device, a timing surface, a high backlight, a backlight, a brightness control, a low potential drive, a brake drive A data 'one LCD strip data line signal, switch line, and image, LCD surface 2. If the application of the mobile unit is connected, the output of low brightness level. 3. If the application unit sends a message to each number of units. The liquid is installed to show the strong energy of the crystal liquid. The brightness is bright and suitable: the package contains the display and the detection material color β degree drive RG bright light does not leave the back and loses, and pre-adds it, Appropriate to the unit system, its control, light •, under the signal pressure rnj. Control the high or lose the yuan, single light system back to the pressure gauge electricity self-visit to drive in place to receive electricity and high output In the Yuan Dynasty, the number of letters is driven by the letter number, and the light is sent back to the pressure. The electric appliance is moving like a picture. The picture number has if//1 - νβ Γ when the picture is scanned and the area is loaded with The line image gate is formed into a creed image. The multi-pattern diagram contains the shape of the packet and loses its moment. The board and the surface line of the sluice gate are used to display the sluice and the parts are closed by the element line. When the 俾 件 同 同 同 同 同 同 同 同 同 同 同 同 同 同 同 同 同 同 同 同 同 同 同 同 连 同 连 连 连 连 连 连 连 连 连 连 连 连 连 连 连 连 连 连 连 连 连 连 连In the light back, the letter board surface control degree is bright and the liquid level is Low drop of the yuan, single light back control to press the pressure ^6- 言 θ " automatic drive in place to receive power Fan ί G ^ R special color control per hour of the ancient mouth gauge, its group, order Putting the gray on the display to show the crystal three liquid or the three components of the material color tt is better than this one to drive the light back! #信制控度Show the value of GI compared to RI, according to the group and order gray, 1289695 _ Case No. 90102101_年月日日__ VI. Patent application scope 4. The liquid crystal display device of claim 1 further includes a gray scale voltage generating unit that controls the data driver, so the data driver receives the data. The low-order brightness control signal from the timing control unit further reduces the gray scale of the relevant data. 5. The liquid crystal display device of claim 3, wherein the timing control unit applies a high driving voltage to the backlight driving unit to increase the backlight brightness when each of the frames is compared to a high gray level, and When the comparison value of the frame is at a low gray level, a normal driving voltage is applied to the backlight driving unit to maintain the backlight brightness in a normal state. 6. The liquid crystal display device of claim 1, wherein the timing control unit comprises: a data control unit that grays out individual RGB color inspection data for each frame in three or more different gray levels The gradation, the number of data of each grayscale, and the number of data outputted in high grayscale and the number of data in low grayscale; a first adder, which is based on the sum of individual RGB colors in high gray The first sum is outputted by the number of data of the gradation; a second adder outputs the second sum by summing the number of data of the individual RGB colors in the low gray level; and a ratio (control, check in one) The ratio of the first and the second sum of the frame, and according to the check ratio, output the normal driving voltage mode to the backlight driving unit, or output the driving voltage higher than the normal driving voltage mode. 7 · The liquid crystal of claim 6 a display device, wherein the data counting unit comprises: O:\69\69056-960718.ptc Page 211289695 Case No. 90102101 曰 Amendment VI. Patent application scope 1 data discriminator, one of which is color data, check and output high-order gray scale data to receive RGB fed by the outside a gray level level of the color data received in the color data, and a low level gray scale data; a first counter, which counts the number of high level gray scale data, and outputs a count value of a second counter, which counts low level gray The number of order data and the output count value are determined by the first sum; a first adder, which is received back by the second 8. a liquid crystal display cross which is equal to the pixel electrode connected light setting screen brightness bit counter and the second up counter The liquid crystal does not have the panel gate line and the opening of the area is required to open the liquid crystal timing control; the gate drive tribute drive receives the display with the formation of the Guan Yuan Guan Yuan display system highlighting, and the returned device has multiple matrix pieces. a panel element, a positioner, and a actuator thereof, which should sum up the high level gray scale data of each frame in a vertical synchronization signal Mesh, and outputting the vertical synchronizing signal corresponding to a summation of each information block number of the low grayscale data output sum. The device comprises a liquid crystal display panel, the gate line carries a scanning signal, and the plurality of data lines intersecting the pixel area simultaneously carry an image signal, which is connected to the gate line and the data line when formed, and the pixel responds to the operation of the switching element, And a back side, the liquid crystal display device comprises: the image data detection target area applied by the outside, and the output scan signal of the liquid crystal display panel is controlled to the liquid crystal display panel; and the image data is output to the liquid crystal display panel; as well as O:\69\69056-960718.ptc Page 22 1269695 Case No. 90102101 曰 Amendment 6. Patent application range: A backlight driving unit that outputs a south potential voltage when receiving a high level brightness control signal from the timing control unit The backlight is illuminating the brightness level of the LCD panel. 9. The liquid crystal display device of claim 8, wherein the backlight driving unit outputs a low potential driving voltage to the backlight when receiving the low level brightness control signal from the timing control unit, thereby reducing the brightness level of the liquid crystal display panel. . 10. The liquid crystal display device of claim 9, wherein the timing control device divides the individual RGB colors into three or more sets of gray scale groups, and counts the number of individual RGB color data of each frame in each gray scale group, The counted numbers are compared with each other, and the brightness control signal is output to the backlight driving unit according to the comparison value. 1 1. The liquid crystal display device of claim 8, further comprising a gray scale voltage generating unit that controls the data driver, so that the data driver allows the related data when receiving the low level brightness control signal from the timing control unit The gray scale is further reduced. 1 2. The liquid crystal display device of claim 10, wherein the timing control unit applies a high driving voltage to the backlight driving unit to increase the backlight brightness when the comparison value of each frame is at a high gray level, and When the comparison value of each frame is at a low gray level, a normal driving voltage is applied to the backlight driving unit to maintain the backlight brightness in a normal state. 1. The liquid crystal display device of claim 8, wherein the timing control unit comprises: a data control unit for each of three or more different gray scales O:\69\69056-960718.ptc Page 231289695 Case No. 90102101 曰Revision 6. Gray scale of individual RGΒ color inspection data in the scope of application for patent coverage, count the number of data of each gray scale, and output high The number of data of the gray scale and the number of data of the low gray scale; a first adder that outputs the first sum by summing the number of data of the individual RGB colors in the high gray scale; a second adder , which outputs a second sum by summing the number of data of the individual RGB colors in the low gray level; and a comparator, checking the ratio of the first to the second sum of the frame, and outputting according to the check ratio The normal drive voltage mode is applied to the backlight drive unit, or the drive voltage is higher than the normal drive voltage mode. 1 . The liquid crystal display device of claim 13 , wherein the data counting unit comprises: a data discriminator that receives one of the RGB color data fed by the outside to check the received color data. Gray level level, and output high level gray scale data and low level gray scale data; a first counter, which counts the number of high level gray scale data, and outputs a count value; a second counter, which counts low level gray scale a number of data and an output count value; a first adder responsive to a vertical sync signal summing the number of high level gray scale data received by the first counter for each frame, and outputting the sum; and a second addition In response to a vertical sync signal, the total number of low grayscale data received by the second counter for each frame is summed and the sum is output. O:\69\69056-960718.ptc Page 24 1269695 Case No. 90102101 曰 Amendment VI, Patent Application No. 1 5 - A method of driving a liquid crystal display device 'The liquid crystal display device includes a liquid crystal display a panel and a backlit liquid crystal display module, a gate driver outputting a scan signal to the liquid crystal display panel, and a data driver outputting an image signal to the liquid crystal display panel, the method comprising the following steps: (a) individual RG color The gray scale data is divided into three or more sets of gray scales, and the number of gray scale data of individual RGB colors of each group is counted; (b) whether the number of gray scale data of the brightest gray scale group exceeds the total gray scale a predetermined ratio of data; (c) if the step (b) is YES, check whether the number of grayscale data in the darkest grayscale group exceeds a predetermined ratio of total grayscale data; and (d) if in (c) The step is to increase the brightness of the backlight while further reducing the gray scale of the low gray level data. A method for driving a liquid crystal display device, the liquid crystal display device comprising a liquid crystal display module having a liquid crystal display panel and a backlight, a gate driver outputting a scan signal to the liquid crystal display panel, and a data driver Outputting an image signal to the liquid crystal display panel, the method comprises the following steps: (a) dividing the gray scale data of the individual RG B colors into a set of high brightness level groups A, a group of medium brightness level groups B, and a set of low brightness Level group C, and calculate the number of grayscale data for each group of individual RGB colors; (b) check if A/(A + B + C) exceeds 0·08 and C/A exceeds 5, and if so, control The backlight turns the brightness of all white into the first brightness level; O:\69\69056-96O718.ptc Page 251289695 Case No. 90102101 曰Revision 6. Application scope (c) If the step (b) is no, check whether A/(A + B + C) exceeds 0 0 5 and whether C / A exceeds 10, and if so, controls the backlight to turn the brightness of all white into a second brightness level higher than the first brightness level; (d) if in (c) If the step is no, check if A/(A + B + C) exceeds 0. 0 3 and C / A exceeds 2 0, and if yes, control the backlight to make the brightness of all white become higher than the second brightness The third brightness level of the level; and (e) if the step (d) is no, the backlight is controlled to change the brightness of the full white to a fourth brightness level lower than the first brightness level. 1 7. A method of driving a liquid crystal display device according to claim 16 of the patent application, wherein the high brightness level covers a gray scale of 4 5 / 6 4 or above, and the medium brightness level covers a gray scale of 4 5 / 64 to 3 The range of 2/6 4 and the low brightness level cover the gray scale 3 2 / 6 4 or below. 1 8. A method of driving a liquid crystal display device according to claim 16 of the patent application, wherein the first brightness level is 300 nits (or candle/square meter) and the second brightness level is 450 nits (or candle) / square meter), the third brightness level is 600 nits (or candle / square meter), and the fourth brightness level is 200 nits (or candle / square meter). 1 9. A method of driving a liquid crystal display device according to claim 16 of the patent application, wherein in steps (b) to (e) of controlling the brightness, the low gray scale data becomes gray scale and is further lowered. A method of driving a liquid crystal display device as claimed in claim 16 wherein the control backlight is performed by controlling an on/off operation ratio of the backlight current. O:\69\69056-960718.ptc Page 26