JP2002202767A - Liquid crystal display device, its drive unit and its method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control brightness of backlight, in which the addition of circuits and power consumption are suppressed. SOLUTION: A timing control part divides the RGB grayscale levels of an image into at least three or more levels (S100). The numbers, contained in the divided levels of respective data extracted from a video of R, G, and B applied from the outside, are counted and compared with each other, on the basis of one video frame (S200, S300, S400). A voltage applied to a backlight drive part is adjusted, in response to the comparison, and the timing control part adjusts the brightness level by units of one video frame. The timing control part increases the brightness of backlight in the case of a screen, in which a high grayscale concentrates locally (or a screen, for which high contrast is demanded), or a screen which has a high grayscaly as a whole (or screen which demands high brightness). Otherwise, the timing control part always maintains brightness to the normal level (S210, S320, S410, S510).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, a driving device thereof, and a method thereof, and more particularly, to a backlight luminance and signal transmission system according to an input image state to be displayed by the liquid crystal display device. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device having an adaptive luminance increasing function for changing a gamma characteristic, a driving device thereof, and a method thereof. In addition, in order to reduce misunderstanding of terms in the description, an analog signal applied to the display device is described as an image signal, and an original signal to be displayed (input signal) is described as a video signal in principle. The original signal is generally in a digital format, and becomes an image signal by DA conversion (a main part of grayscale voltage generation).

[0002]

2. Description of the Related Art Generally, in a CCFL (cold cathode fluorescent lamp) used as a light source for an LCD, luminance and life are inversely proportional in terms of characteristics. In other words, although the life is shortened when driving with a high current to increase the luminance, there is a problem that it is difficult to achieve a high luminance because the driving must be performed with a low current to extend the life.
However, in practice, high brightness and long life are required at the same time in most cases from the viewpoint of product application.

In order to respond to such a demand, in a general LCD screen state, when a screen requiring a special high brightness is displayed while driving at a certain brightness, the LCD is temporarily stopped. A technique is used in which a high current is applied to a backlight lamp to expand the active area in accordance with the luminance to be displayed.

[0004] In addition, the amount of current used by the display element of the LCD itself changes according to the image displayed on the screen. For example, in the case of a normally white mode in which liquid crystal molecules are rearranged in the direction of an electric field when a voltage is applied to block incident light,
In general, the power consumed by the panel decreases as the number of bright pixels on the screen increases, but the power consumed by the panel tends to increase as the number of dark pixels increases. Using such a tendency, a method of controlling the lamp current value in conjunction with the power consumed by the panel is mainly used.

However, in applying such a technique, it is necessary to detect the current consumed by the panel and transform the current to match the variable range of the brightness control signal of the power converter for driving the backlight. Therefore, there is a problem that an additional circuit must be formed.

Further, since the brightness is controlled for all the screens, there is a problem that the power consumption has to be increased as compared with the case where the brightness is controlled only for the screen that needs to be controlled.

[0007]

SUMMARY OF THE INVENTION Accordingly, the present invention is to solve such a conventional problem, and an object of the present invention is to provide a video data to be displayed in units of one video frame. It is an object of the present invention to provide a liquid crystal display device having an adaptive brightness adjustment function for controlling the brightness of a backlight according to the gradation level.

Another object of the present invention is to provide a driving apparatus for a liquid crystal display device having an adaptive brightness adjustment function for controlling the brightness of a backlight according to the gradation level of video data to be displayed. It is in.

Another object of the present invention is to provide a driving method of a driving device for a liquid crystal display device having the adaptive brightness adjusting function.

[0010]

A liquid crystal display device for realizing the object of the present invention comprises a plurality of gate lines, a plurality of data lines, a switching element connected to the gate lines and the data lines, An LCD panel having a pixel electrode connected to an element and responsive to the operation of the switching element; a gate driver for sequentially outputting a scanning signal to the gate line; a data driver for outputting an image signal to the data line;
A power converter that outputs a predetermined backlight drive voltage,
A backlight unit that is disposed on a rear surface of the LCD panel and that outputs predetermined light in response to application of the backlight drive voltage; The image signal is converted into a signal for outputting the scanning signal and output to the data driver and the gate driver, and the characteristics of the image signal are determined. A backlight control signal of a high or low potential voltage is provided to the power converter according to whether to request a brightness or low brightness level drive, and the brightness level of the LCD panel is increased or decreased to determine a stop image. And a timing control unit that outputs a backlight control signal for controlling the output of a certain luminance level to the power converter.

Here, the timing control unit checks the characteristics of the video signal constituting one frame, and
Increase or decrease the brightness level of the D panel. At this time, when a high-potential backlight control signal is applied from the timing control unit, the power converter outputs a high-potential voltage to the backlight unit to increase the brightness level of the LCD panel. And when a normal potential backlight control signal is applied from the timing control unit, a normal potential voltage is output to the backlight unit and the
It is preferable to maintain the brightness level of the panel. Normally, the three colors R, G, and B are adjusted collectively, but when individual adjustment is possible, for example, an LED that emits each of the RGB colors
If the group is a light source, each color can be adjusted independently,
It is also possible to individually adjust each LED group depending on the location of light and dark.

Further, the timing control unit divides each floor adjustment range into at least three or more gradation level groups for each of the RGB of the video signal, and externally controls one video frame as a reference. R, G, applied from
B counts the number of each image extraction data (partial image signal corresponding to the selected pixel or pixel complex) included in each of the divided gray level groups, and compares the count value of each count value ( Preferably, the backlight control signal is output to the power converter according to the comparison result). According to claim 5, when the counter value in one image frame unit is large in a high gradation range, a high power converter driving voltage is applied, and when the counter value is large in a low gradation range, a normal power converter driving voltage is applied. preferable.

Further, when a luminance control signal of a low luminance level is input from the timing control section, the apparatus further includes a gradation voltage generation section for controlling the data driver so as to change data to a low gradation. Is preferred.

Further, the timing control unit determines and counts in which range of at least three or more divided gradation levels each of the RGB image extraction data forming one image frame is included, High gradation level R
A data coefficient section for outputting the number of video extracted data of each of RGB and the number of video extracted data of each of RGB of a low gray level, and a first total value obtained by adding the number of video extracted data of each of RGB included in the high gray level; A first summation unit that outputs the first summation value, and a second summation unit that sums the number of video extraction data of each of the RGB included in the low gradation level and outputs a second summation value.
Check the ratio of each of the sum and the second sum in one image frame, and output the driving voltage of the general mode to the power converter or the driving voltage of the mode brighter than the general mode according to the ratio. It is preferable to include a comparing unit for outputting.

On the other hand, the gist of the present invention is that the data coefficient section receives one of R, G, and B video data provided from the outside and changes the gradation level of the video extraction data. A data discriminator for checking and outputting high gradation level data and low gradation level data, a first counter for counting the high gradation level image extraction data and outputting the count number, 2nd which counts the video extraction data of the level and outputs the count number
A counter, a first adder for adding the count number provided from the first counter to the number of video extraction data of a high gray level in one frame unit in response to one vertical synchronization signal, and outputting the sum; A second adder for summing up the count number provided from the second counter in response to one vertical synchronizing signal and outputting the number of pieces of video data at a low gray level in units of one frame, and outputting the sum. In relation to item 9, the timing control unit checks the characteristics of video signals constituting one or more unit cells arbitrarily designated in one frame, and increases or decreases the brightness level of the LCD panel.

At this time, the timing controller checks the characteristics of the input video data and outputs a video discrimination signal according to the type of the discriminated video. It is preferable that the apparatus further includes an inquiry unit and a brightness control unit that outputs a backlight control signal corresponding to a backlight brightness signal based on the video determination signal, and the brightness control unit further outputs a gamma voltage control signal.

According to another aspect of the present invention, the backlight control signal performs a brightness increasing function based on the backlight brightness signal when the video determination signal is determined to be a moving image. Preferably, when the video discrimination signal is determined to be a still video, the video discrimination signal is a signal that controls to output a constant luminance level.

The gamma voltage control signal may be based on a backlight luminance signal when the video discrimination signal indicates a moving image, or a backlight luminance signal when the video discrimination signal indicates a stationary image. Preferably, the liquid crystal display device controls so as to output a corrected gamma voltage or a fixed value gamma voltage irrespective of the gamma voltage or the gamma voltage corrected in response to the provision of the gamma voltage control signal. And a gamma processing unit for outputting a gamma voltage having a predetermined value to the data driver.

Further, in accordance with the present invention, the video inquiry unit includes a storage unit for storing the video data, and a first unit corresponding to a plurality of unit cells from the video data of the k-th frame input from the outside. A data set is extracted and stored in the storage unit, and a second data set corresponding to the unit cell is extracted from video data of a (k + N) (where N is a positive integer) frame. The frame coefficient unit that stores the data in the storage unit and outputs the first data set and the second data set is compared with the first data set and the second data set. First
A data comparing unit that outputs a signal and outputs a second signal when the signals are different, and outputs a first video discrimination signal for determining a still image when the first signal is input from the data comparing unit. It is preferable that the image processing apparatus further includes a video discrimination unit that outputs a second video discrimination signal for determining a video when the second signal is input from the data comparison unit.

At this time, according to claim 16, when the second signal is inputted from the data comparing section, the output value of the comparison data corresponding to the first direction is all the second signal. And if all are the second signals, output a second video discrimination signal for judging that the video is a moving image, and output at least one of the output values of the comparison data corresponding to the first direction. If not, check whether the second signal number of the comparison data is equal to or more than a predetermined number, and output a second video discrimination signal for determining a moving image if the second signal number is equal to or more than the predetermined number, If the number is less than the predetermined number, it is preferable to output a first video discrimination signal for determining a still video. Further, according to claim 17, the unit cell is a predetermined pixel block corresponding to the left side of the upper end of the LCD panel, a predetermined pixel block corresponding to the right side of the upper end of the LCD panel, and a left side of the lower end of the LCD panel. Corresponding predetermined pixel block, said LCD
It is preferable to further include at least one of predetermined pixel blocks corresponding to the right side of the lower end of the panel.

According to claim 18, a driving device of a liquid crystal display device for realizing another object of the present invention is as follows.
A plurality of gate lines transmitting a scan signal; a plurality of data lines intersecting the gate line to transmit an image signal; and a plurality of gate lines and data lines formed in a region surrounded by the gate lines and the data lines. A switching element connected to the switching element, an LCD panel arranged in a matrix with pixel electrodes connected to the switching element and responsive to the operation of the switching element, and a backlight unit located on the rear surface of the LCD panel. A driving device for a liquid crystal display device, comprising: a gate driver that sequentially outputs a scanning signal to the gate line; a data driver that outputs an image signal to the data line; and a power converter that outputs a predetermined backlight driving voltage. Is disposed on a rear surface of the LCD panel, and is provided with the backlight. A backlight unit that outputs predetermined light in response to the application of a driving voltage, and a video signal and a timing signal that are input from outside are provided, and the backlight unit converts the image signal and the scanning signal into signals for outputting the scanning signal. Output to the data driver and the gate driver respectively.
If the video signal is determined to be a moving image by determining the characteristics of the video signal, a backlight control signal of a high-potential or low-potential voltage is converted to a power conversion signal depending on whether the video signal requires high-luminance or low-luminance level driving. A timing control unit for increasing or decreasing the brightness level of the LCD panel by providing the backlight converter with a backlight control signal for controlling the output of a certain brightness level when it is determined to be a still image. It is comprised including.

Here, regarding the nineteenth aspect, the timing control unit checks the characteristics of the video signal constituting one frame to increase or decrease the brightness level of the LCD panel. According to the twentieth and twenty-first aspects, the timing control unit determines which of the three or more divided gradation levels the video extraction data of each of RGB forming one video frame is included in. And counting, and from among the counted levels, the number of image extraction data of each of the high gradation level RGB and the low gradation level RGB.
B: a data coefficient section for outputting the number of video extraction data for each of
A first summing unit for summing the number of image extraction data of each of the high gradation level RGB and outputting a first summation value, and a second summation summing the number of image extraction data of each of the low gradation level RGB.
A second summing unit that outputs a summed value, and the first summed value and a second summed value.
A comparing unit that checks a ratio of each of the sum values in one image frame, and outputs a driving voltage of a general mode to the power converter or a driving voltage of a mode brighter than the general mode according to the ratio. The data coefficient unit receives any one of R, G, and B image data provided from the outside, checks the gray level of the image extraction data, and outputs the high gray level image extraction data. A data discriminator that outputs video extraction data of a low gradation level, a first counter that counts the video extraction data of the high gradation level and outputs the count number,
A second counter that counts the image extraction data of the low gray level and outputs the count, and counts the count provided by the first counter in units of one frame in response to one vertical synchronization signal. A first adder for summing and outputting the number of video extraction data at a gray level;
It is preferable to include a second adder for adding the count number provided from the counter in response to one vertical synchronizing signal and adding up the number of pieces of low-gradation-level image extraction data for each frame.

According to the present invention, the timing controller checks the characteristics of video signals constituting one or more unit cells arbitrarily designated from one frame to increase or decrease the brightness level of the LCD panel. Let it.

According to another aspect of the present invention, there is provided a method of driving a liquid crystal display device for realizing another object of the present invention, comprising: a liquid crystal display module including an LCD panel and a backlight unit; And a data driver for outputting an image signal to the LCD panel, wherein: (a) at least three or more image gradation data with respect to one video frame; It is divided into gradation level groups, and R, G, B
Counting each video extraction data,
(B) checking whether the number of data of the brightest gradation level group among the divided gradation level groups is equal to or greater than a certain ratio of the entire video extraction data; and (c) the step (c). In b), when the number of data of the brightest gradation level group is equal to or more than a certain ratio of the entire video extraction data, the data number of the darkest gradation level group among the divided gradation level groups Checking whether or not is equal to or more than a certain ratio of the whole image extraction data; and (d) in the step (c), when the number of data of the darkest gradation group is more than a certain ratio of the whole image extraction data. In some cases, the method includes the steps of maintaining the brightness of the backlight normally and performing gradation conversion of low gradation data.

According to another aspect of the present invention, there is provided a method of driving a liquid crystal display device for realizing another object of the present invention, comprising: a liquid crystal display module including an LCD panel and a backlight unit; And a data driver for outputting an image signal to the LCD panel, comprising: (a) converting the grayscale data of an image to a high-brightness level grayscale during one frame; A, dividing the gradation of the middle luminance level into B, and dividing the gradation of the low luminance level into the group of C, and counting the number of the gradation; and (b) A based on the count in the step (a). / (A + B + C) is 0.08 or more and C
Checking whether / A satisfies a first condition of 5 or more, and if the first condition is satisfied, controlling the backlight unit so that full-white luminance becomes the first luminance level; , (C) the first step in the step (b).
When the condition is not satisfied, A / (A + B + C) is 0.05.
It is checked whether the C / A satisfies the second condition of 10 or more. If the second condition is satisfied, the full white luminance becomes the second luminance level darker than the first luminance level. And (d) if the second condition is not satisfied in the step (c), A / (A + B + C) is 0.03 or more and C / It is checked whether or not A satisfies a third condition of 20 or more. If the third condition is satisfied, the backlight is set so that full-white luminance becomes a third luminance level darker than the second luminance level. (E) when the third condition is not satisfied in the step (d), the backlight is controlled so that the full white luminance becomes a fourth luminance level darker than the third luminance level. Controlling the part

According to claim 27, a driving method of a liquid crystal display device for realizing another object of the present invention is as follows.
A method for driving a liquid crystal display device, comprising: a liquid crystal display module including an LCD panel and a backlight unit; a gate driver for outputting a scanning signal to the LCD panel; and a data driver for outputting an image signal to the LCD panel. And (b) setting a plurality of unit cells;
Storing a first data set corresponding to each of the unit cells in a k-th frame input from the outside;
(C) When N frames have elapsed, a second data set corresponding to each of the unit cells is stored in a (k + N) th frame, and the first data set and the second data set are compared and the same. If so, a first value is set; if different, a second value is set to calculate a plurality of first comparison values; and (d) all of the plurality of first comparison values are equal to a second value. If the value is a value, determining the input video as a moving video;
If one of the plurality of first comparison values is not the second value, checking whether the number of the plurality of first comparison values being the second value is equal to or greater than a predetermined number; (F)
In step (e), if the number of the first comparison values, which is the second value, is greater than or equal to the predetermined number, the input image is determined to be a moving image, and the number of the first comparison values, which is the second value, If is less than a predetermined number, determining the input video as a stop video,
(G) If the input image is determined to be a moving image in the step (d) or the step (f), the brightness of the backlight is controlled according to the gray level of the image data to be displayed in one image frame unit. Activating the adaptive brightness increasing function to output video data; and (h) deactivating the adaptive brightness increasing function if the input video is determined to be a stop video in the step (f); Outputting video data according to a predetermined reference luminance level.

According to such a liquid crystal display device, its driving device, and its method, a current value based on video data is detected to adjust the luminance of a backlight, compared to the conventional technology.
By controlling the luminance of the backlight in accordance with the gradation voltage level of the video data, higher contrast can be realized.

Further, the luminance level of the backlight can be controlled by selecting a plurality of specific portions from the display screen and tracking and observing changes in the video data.

[0029]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments will be described below so that those having ordinary knowledge can easily implement the present invention.

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

Referring to FIG. 1, a liquid crystal display device according to an embodiment of the present invention includes a liquid crystal display module 100 including an LCD panel 110 and a backlight unit 120, a timing control unit 200, a gate driver 300, a data driver 400, A driving device for a liquid crystal display module including the backlight power converter 500 and the grayscale voltage generator 600 is included.

The LCD panel 110 is composed of a plurality of m × n matrix type pixel electrodes, and each pixel electrode is provided with a switching element.
A gate voltage (or a scanning signal, G1, G2, or G1) provided from the gate driver 300 through the gate line.
, Gn) are applied to the switching elements of the corresponding pixels, the data voltages (or pixel signals D1, D2,...) Provided from the data driver 400 through the data lines.
, Dm), the corresponding pixel electrode is driven, and an image is displayed using the backlight unit 120 on the back of the LCD panel as a light source.

The timing control section 200 includes a data coefficient section 210, a first summation section 220, a second summation section 230, a comparison section 240, a memory control section 250, and an SRAM section 260. In particular, one embodiment of the present invention will be described. In relation to, the RGB grayscale data is divided into three grayscale level groups and counted in one frame unit.

The timing controller 20 will be described roughly.
0 indicates that when a large number of bright gradation image data is included in one counted frame, a backlight including an inverter or the like is applied to the backlight power converter 500 so as to apply a drive voltage higher than a normal drive voltage. The power converter such as the light power converter 500 is controlled to increase the luminance.

When a large number of dark gradation image data are included in one counted frame, a normal drive voltage is applied to the backlight power converter 500 to maintain the brightness and brightness. , Liquid crystal display module 100
Is adjusted so as to obtain a darker luminance level.

More specifically, the data coefficient section 210
Includes an R data coefficient unit 212, a G data coefficient unit 214, and a B data coefficient unit 216, each of which includes one data discrimination unit, two counters, and two summers, and includes an external graphic controller ( The number of RGB tone data of an image applied from a video signal (not shown) is counted, and high-level RGB tone data (R3, G3, B) is counted.
3) is counted and output to the first summation unit 220, or the low-level gradation data (R1, G1, B1) is counted and output to the second summation unit 230.

Then, the data discriminating unit 212-1 constituting the R data coefficient unit 212 and the first counter 212-
3, the second counter 212-5, the first summer 212-
7. The present invention will be described in more detail by taking the second adder 212-9 as an example.

The data discriminating section 212-1 checks the gradation level of the input R video data, and if it is judged that the R data has a high gradation level, adds it to the first counter 212-3. If it is checked that the data is R data of a low gradation level, it is added to the second counter 212-5.

The first counter 212-3 receives and counts the high gradation level R data provided from the data discrimination unit 212-1 and provides the counted number to the first summer 212-7. The second counter 212-5 receives and counts the R data at the low gray level, and counts the R data.
Provide the counted number in 12-9.

The first adder 212-7 counts the count provided from the first counter 212-3 with the R data of a high gradation level every one frame period according to one vertical synchronization signal (Vsync). The first summation unit 2
The second adder 212-9 outputs the count value provided from the second counter 212-5 to the low grayscale level every one frame period according to one vertical synchronization signal (Vsync). The number of R data is summed and output to the second summing unit 230.

The first summation unit 220 includes a data coefficient unit 210
, The number of video data of each of the RGB of the high gray level is received in one frame unit, added and provided to the comparing unit 240. The second summing unit 230 receives the RGB data of the low gray level from the data coefficient unit 210. Are received in one frame unit, added together, and provided to the comparison unit 240.

The comparing section 240 outputs the high gradation level RG input from the first summing section 220 every frame period.
B by comparing the number of video data of each of the B and the number of video data of each of the RGB of the low gradation level input from the second summing unit 230, and comparing the number of the video data of each of the RGB of the high gradation level with the low level. When it is determined that the number is relatively larger than the number of video data of each of the RGB levels,
A luminance control signal 241 for controlling the backlight power converter 500 to apply a high drive voltage is output to increase the luminance. If the opposite is the case, a luminance control signal 241 for applying a normal drive voltage to the backlight power converter 500 is output.

At this time, when the brightness control signal 241 for applying the normal drive voltage is output, the low gradation data is further reduced to compensate for the backlight becoming bright. A luminance control signal 241 for controlling the conversion is output to the memory control unit 250.

The memory control unit 250 provides the digital video data of RGB provided from a graphic controller (not shown) to the SRAM unit 260. If a specific range of video data is displayed, low-gradation RGB video data (R ′, R ′, G ', B
') Is extracted and output to the SRAM section 260. ROM used here as a look-up table (LUT)
It has been described as an example that the H.255 is installed outside the timing control unit 200.
The gist of the present invention will not be deviated even if it is located inside.

The SRAM section 260 includes a memory control section 250
SRAM 26 for storing R data provided from
2, a second SRAM 264 for storing G data and a third SRAM 266 for storing B data,
50, and receives RGB video data (R ′, G ′, B ′) from the corresponding RGB video data (RA, GA, B).
A) is provided to the data driver 400.

At this time, when the luminance control signal 241 of the low gradation level is input from the comparison unit 240, the low gradation data is further reduced to compensate for the backlight becoming brighter. Signal 2 to control to convert
51 is output to the gradation voltage generator 600.

The grayscale voltage generator 600 forms a grayscale in association with the number of bits of R, G, and B data applied from an external graphic controller and applies the grayscale to the data driver 400. It serves to guide data transmitted from the data driver 400 to the pixel so that the data can be transmitted to the pixel. Of course, if the signal 251 for controlling to convert to a lower gray level is input from the memory controller 250 of the timing controller 200, a gray level lower than the normal gray level is generated and output to the date driver 400. I do.

The data driver 400, which is also referred to as a source driver, receives the adapted RGB image data (RA, GA, BA) applied from the timing controller 200 and stores it in a shift register (not shown). Then, when a signal (LOAD) instructing to send data to the LCD panel 110 is issued, a voltage corresponding to each data is selected by D / A conversion and the LCD panel 110 is selected.
To transmit that voltage.

As described above, when the backlight of the liquid crystal display device is driven, a screen that locally concentrates on a high gradation (or a screen that requires a high contrast) or a screen that generally has many high gradations. In the case of (or a screen requiring high brightness), the brightness of the backlight is increased, and otherwise, the brightness is maintained normally, so that the contrast at the time of displaying an image can be further increased.

Hereinafter, the operation of the liquid crystal display device having the adaptive brightness adjusting function according to the present invention will be described in more detail.

FIG. 2 is a diagram for explaining the general number of data for each gradation.

As shown in FIG. 2, the gradation distribution of the video is
It is easy to count the number of data at or above a specific gray scale (for example, 45/64 gray scale) and the number of data at or below another specific gray scale (for example, 32/64 gray scale) and compare them. You can judge. Here, the 45/64 gray scale or 32/64 gray scale is a gray scale in which each luminance becomes 1/2 or 1/4 of the maximum luminance when the gamma value of the display is 2. Those skilled in the art will be able to change such numerical values.

An example of a method of judging an image for which luminance should be increased will be described. First, the number of data of 45/64 gradation or more is 5% or 3% or more, and the number of data of 45/64 gradation or more is 32/64 gradation or more. When the number of data is 10 times or more, the luminance of the backlight and the data of low gradation are subjected to gradation conversion.

Hereinafter, the brightness of the backlight according to the present invention is changed according to the image to be driven.
Driving in stages will be described as an example.

FIG. 3 is a flowchart for explaining a liquid crystal display method having an adaptive brightness adjustment function according to an embodiment of the present invention.

Referring to FIG. 3, first, the gradation data of the image is converted into A, 45/64 to 32/6, for 45/64 gradation or more.
The four gradations are divided into groups of B and 32/64 gradations or less into groups of C, and the number of gradations is counted (step S10).
0).

Next, it is checked whether A / (A + B + C) is 0.08 or more and C / A satisfies the condition of 5 or more (step S200). Has a luminance of 600 nits (or cd / m
The lamp current value of the backlight or the ratio of the on / off duty of the lamp current is controlled so as to satisfy 2) (step S210), and gradation conversion of low gradation data is performed (step S220).

In step S200, A / (A + B + C) is set to 0.
08 or more and C / A does not satisfy the condition of 5 or more, A / (A + B + C) is 0.05 or more and C / A
It is checked whether or not A satisfies a condition of 10 or more (step S300). If the condition is satisfied, the lamp current value or the lamp current of the backlight is turned on / off so that the full white luminance becomes 450 nits. The duty ratio is controlled (step S310), and gradation conversion of low gradation data is performed (step S320).

If the second condition is not satisfied in step S300, A / (A + B + C) is 0.03 or more and C / C
It is checked whether / A satisfies the condition of 20 or more (step S400). If the third condition is satisfied, the lamp current value or lamp current of the backlight is adjusted so that the full white luminance becomes 300 nits. The on / off duty ratio is controlled (step S410), and gradation conversion of low gradation data is performed (step S420).

If the third condition is not satisfied in step S400, the lamp current value of the backlight or the ratio of the on / off duty of the lamp current is controlled so that the full white luminance becomes 200 nits (step S51).
0), performing gradation conversion of low gradation data (step S5)
20).

As described above, the gradation data of an image is represented by A (45/65 gradation or more), B (45/64 gradation to 32/64 gradation), and C (32/64 gradation or less). The numbers of gradations are counted, and the numbers of A, B, and C are compared to control the luminance in four stages, thereby controlling the brightness of the luminance. The division of the luminance into the 45/64 gradation and the 32/64 gradation is a gradation in which the luminance is と and １ ／, respectively, based on the case where the gradation is a gamma value of 2. There is, but it is not limited to such figures.

In the case of an LCD panel, as the brightness of the backlight increases, the brightness of the low-gradation pixels also increases. Therefore, the backlight cannot maintain the same brightness as when the brightness is not increased unless the gradation is further reduced. It can be said that the range has increased.

Then, an example of the gradation change is described in two of the four steps (the luminance is 450 nits and 200 nits).
Will be described with reference to FIGS. 4 and 5.

FIG. 4 is a diagram for explaining the luminance for each gradation before tuning and the luminance for each gradation after tuning according to the present invention.

As shown in FIG. 4, when there is no gradation correction of the LCD panel, the luminance of the backlight becomes the panel luminance 2
The luminance for each gradation when 00 nits and 450 nits are matched and the luminance for each gradation when gradation tuning is performed are shown.

When the gradation is tuned without performing the gradation correction of the LCD panel, the same luminance as before the luminance becomes bright is maintained at a low gradation even though the luminance of the backlight becomes bright. Can be confirmed.

FIG. 5 is a diagram showing gradation tuning in consideration of a change in luminance of a backlight according to the present invention.

As shown in FIG. 5, by making the dark part darker and maintaining the brightness of the bright part the same, the contrast in displaying an image can be further increased.

That is, the contrast at the time of 200 nits is 350 to 400: 1, but the effective contrast at the time of actual moving image display is about 1000: 1 at the maximum.

As described above, in a moving image, a certain number of video data is generally concentrated at a high gray scale, but more video data is generally concentrated around a low gray scale. According to an embodiment of the present invention, the backlight is controlled to have a high luminance so that the predetermined number of high-gradation images can be clearly viewed. At the same time, in one embodiment of the present invention, for low-gradation video data, the data is changed to a gradation lower than the original gradation, thereby compensating for the increased backlight luminance. .

In the case of video data having a continuous gradation distribution other than such video, there is no need to intentionally increase the brightness of the backlight regardless of power consumption.

Also, according to one embodiment of the present invention, when a luminance control signal is sent to a power converter of a backlight through a simple operation of digital data, it is not necessary to form a separate circuit. There is no extra cost to do so.

As described above, the TV and the DVD are used in the liquid crystal display device.
When reproducing a moving image such as a moving image, the embodiment of the present invention is very effective. However, in the case of a generally expensive LCD TV (for both TV and monitor), P
In addition to the role of TV for C, it also has utility as a personal monitor. That is, when an LCD TV to which the digital adaptive brightness adjustment function according to the embodiment of the present invention is applied is used as a monitor, there is a high possibility that a problem will occur.

For example, if a document work or web surfing is performed on an LCD TV to which a digital adaptive brightness adjustment function is applied, excessively high brightness may be generated and eyestrain may be caused. There is a problem that the luminance level of the LCD screen during use changes greatly.

In order to eliminate eyestrain and excessive change in luminance level, it is necessary to arbitrarily turn on / off the digital adaptive luminance adjustment function through an external operation.

Therefore, in another embodiment of the present invention, the characteristics of the video signal input from the outside are analyzed to determine whether the input video is a moving video signal for TV, video player, DVD, etc. Alternatively, a video identification method and a digital identification method for automatically turning on / off a digital adaptive brightness adjustment function according to an embodiment of the present invention by identifying whether the video signal is a stop video signal used in a monitor or the like. And a driving device for the liquid crystal display device, which can realize the above.

Generally, a video signal for a TV or a video player is a medium for storing an actual video in a camera, converting the video into an analog or digital signal, and transmitting or recording the video. Therefore, even if a fixed limited portion of each video frame is converted into a digital or analog signal, a small difference between frames occurs.

Also, a signal based on a still image is generated based on a digital device, and if this signal is expressed on a digital signal processing medium such as an LCD monitor, a frame is formed unless an artificial change is made on the screen. Even if they are different, the same value is obtained up to a fine gradation portion.

FIG. 6 is a diagram for explaining a liquid crystal display device having an adaptive brightness adjusting function according to another embodiment of the present invention, and FIG. 7 is a diagram for explaining a unit cell set according to the present invention. FIG.

Referring to FIGS. 1 and 6, a liquid crystal display device having an adaptive brightness adjustment function according to another embodiment of the present invention comprises a liquid crystal display module 100, a timing control unit 20.
0, gate driver (or scan driver) 3
1, a data driver 400, a backlight power converter 500, and a grayscale voltage generator 600.
The components performing the same operations as those described above are not shown and will not be described.

A timing control unit 200 disclosed in another embodiment of the present invention includes a data coefficient unit 210, a first summation unit 220, a second summation unit 230, a comparison unit 240, a video inquiry unit 270, and a brightness control unit. The same elements as those shown in FIG. 1 including the 280 and the same operations as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

The video inquiry section 270 is provided with the frame coefficient section 27
2. Check whether the characteristics of the input video data is a moving image or a stop image by including a storage unit 274, a data comparison unit 276, and a video discrimination unit 278, and determine according to the checked video. And outputs the determined video discrimination signal 271.

More specifically, the frame coefficient section 272 extracts first data sets corresponding to a plurality of unit cells from the video data of the k-th frame input from the outside, and first stores them in the storage section 274. When the video data of the (k + N) th frame is input, the second data sets corresponding to the plurality of unit cells are respectively extracted and stored in the storage unit 2
After storing the data in the data set 74, the first data set and the second data set are provided to the data comparison unit 276.

Here, as shown in FIG. 7, the plurality of unit cells are 3 * 3 pixel blocks including one pixel, and correspond to the center of the screen of the video data to be displayed on the LCD panel. A first point (E), a second point (B) corresponding to the center of the upper end of the screen, a third point (H) corresponding to the center of the lower end of the screen, and a left side of the middle end of the screen. It is preferable to include a fourth point (D) and a fifth point (F) corresponding to the right side of the center of the screen.

The sixth screen corresponding to the left side of the upper end of the screen
Point (A), seventh point (C) corresponding to the right side of the upper end of the screen, eighth point (G) corresponding to the left side of the lower end of the screen, and ninth point (G) corresponding to the right side of the lower end of the screen ( I)
May be further included.

In FIG. 7, the position of each pixel block is defined as 1 based on the upper and lower edges of the screen and the left and right edges.
Although the arrangement in / 6, 1/2, or the like has been described as an example, the gist of the present invention is not limited to such numerical values.

The storage unit 274 includes a memory or a register, and stores each image data corresponding to a unit cell from the frame coefficient unit 272 when it is input.

The data comparing section 276 is provided with the frame coefficient section 2
From 72, the first data set and the second data set are compared, and the first signal or the second signal as a data comparison signal is provided to the video discrimination unit 278. For example, comparing the video data corresponding to the specific cell, if the first data set and the second data set are the same, set and output “0” as the first signal, Is set to '1' as the second signal and output. Here, the first signal and the second signal to be set have been described as examples of “0” and “1”, but they may be set to “1” and “0”, and may be set to other values. Can also.

The video discriminating section 278 includes a data comparing section 276
When “0” is input as the first signal from the control unit 28, it is determined that the image is a still image, and the first image determination signal is output to the luminance control unit 28.
The signal is output to 0, and when “1” is input as the second signal, it is determined that the image is a moving image, and the second image determination signal is output to the luminance control unit 280.

The luminance control section 280 includes a backlight luminance processing section 282, a memory / gamma control section 284, and a ROM 28.
And outputting a backlight control signal and a gamma voltage control signal corresponding to a backlight luminance signal based on the first video discrimination signal or the second video discrimination signal.

More specifically, the backlight luminance processing unit 2
82, when the first video discrimination signal is input from the video query unit 270, outputs a first control signal irrelevant to a backlight luminance signal to the power converter 500; When the second video discrimination signal is input, a second control signal corresponding to the backlight luminance signal is output to the power converter 500.

The memory / gamma control unit 284 controls the first
When a control signal is input, a gamma voltage that is corrected irrespective of a backlight luminance signal or a gamma voltage is extracted from a ROM 286 that stores a gamma voltage of a fixed value, and is output. When the control signal is input, the gamma voltage corrected based on the backlight luminance signal is output to the gamma processing unit 290.

The gamma processing unit 290 includes a gamma voltage corrected based on the backlight luminance signal provided from the memory / gamma control unit 284, a gamma voltage corrected regardless of the backlight luminance signal, or a fixed gamma voltage. The value gamma voltage is received and provided to the data driver 400.
Here, the gamma processing unit 290 is the timing control unit 200
Although the configuration is described separately from the above, it may be included in the timing control unit 200.

As described in the other embodiments of the present invention, the characteristics of video data input from the outside are examined, and if it is determined that the video is a still video, the liquid crystal display device is used for monitoring. You can see. In other words, the luminance increasing function according to the embodiment of the present invention is stopped, and a constant luminance signal based on an external reference signal or a constant luminance signal set to itself is always provided to output a stable screen. Power consumption,
The screen contrast can be maintained.

When the characteristics of the input video data are determined to be moving images, the liquid crystal display device can be used for TV, video player, DVD, etc. By activating the luminance increasing function according to the example, high luminance can be output by the luminance increasing signal, and the contrast of the screen can be maintained.

At this time, one method of checking whether the video data is a still video or a moving video is to divide one frame into a plurality of unit cells and compare the data signals for each frame at fixed intervals. Then, it is to check whether the display screen is a still image or a moving image.

Hereinafter, a method of checking whether an input image is a moving image or a still image will be described in detail with reference to the accompanying drawings.

FIGS. 8A and 8B are flowcharts illustrating a method of driving a liquid crystal display device having an adaptive brightness adjustment function according to another embodiment of the present invention.

Referring to FIGS. 8A and 8B, first, as shown in FIG. 7, a plurality of unit cells to be displayed in one frame are set (step S610).

Next, the first data set obtained by extracting the video data corresponding to the unit cell from the currently input frame is stored (step S615). The first saved at this time
The data set may be data corresponding to 9 points, or may be data corresponding to 5 points corresponding to each point of the cross pattern.

Next, it is checked whether or not N frames have elapsed (step S620). If N frames have elapsed, the second data set obtained by extracting video data corresponding to the unit cell from the input frame is checked. And comparing the already stored first and second data sets,
The first comparison data is stored (S625).

Next, it is checked whether the first data set and the second data set are the same (step S63).
0), if it is checked that they are the same, set to “0” as the first comparison data (step S632), and if they are different, it is set to “1” as the first comparison data.
(Step S634).

Next, it is checked whether or not the output value of the horizontal direction comparison data, for example, all three points are “1” (step S640). If not, it is checked whether four or more of the comparison data are '1' (step S645).
Here, checking the output value of the horizontal direction comparison data has been described as an example, but it is also possible to check the output value of the vertical direction comparison data.

If four or more of the comparison data are "1" in step S645, it is determined that the moving image is a moving image (step S65).
0) If four or more are not “1”, it is determined to be a still image (step S652), and if all output values of the horizontal or vertical direction comparison data are “1” in step S640, it is determined to be a moving image. (Step S654).

Steps S650, S652, S654 and subsequent steps
(Here, M is a positive integer greater than N) It is checked whether or not a frame has elapsed (step S660).
If a frame has elapsed, a third data set obtained by extracting video data corresponding to a unit cell from an input frame is stored, and a second comparison is made between the second data set and the third data set. Save the comparison data (Step S6)
65).

Next, it is checked whether or not the second comparison data is “1” and the setting screen satisfies the first condition that is a moving image (step S670). It is determined whether step S670 has been performed twice (step S675). In step S675, step S670 is performed.
If it is checked that the step has been performed twice, step S615
If it is determined that the performance has not been performed twice, the process returns to step S660. Here, performing step S670 twice when the first condition is satisfied has been described as an example. However, performing step S670 three or more times may be used as an example.

If it is determined in step S670 that the second comparison data is not “1” and the setting screen is not a moving image, the comparison data at the intermediate point of the second comparison data is “0” and the setting screen is a still image. It is checked whether a certain second condition is satisfied (step S680). If the second condition is satisfied, it is checked whether the step S680 has been performed twice (step S685). If it is determined in step S685 that step S680 has been performed twice, the process returns to step S615. If it is determined that step S680 has not been performed twice, the process returns to step S660.

Although the preferred embodiments of the present invention have been described with reference to the preferred embodiments, those skilled in the art will appreciate that the present invention does not depart from the spirit and scope of the present invention as set forth in the appended claims. It will be understood that the invention is capable of various modifications and variations.

[0109]

As described above, according to an embodiment of the present invention, one frame of RGB is formed in a liquid crystal display device.
Check the gradation voltage level of the video data. When it is determined that the luminance level is high based on the number of levels of the checked gradation voltages, the luminance of the backlight is controlled to be higher than the general level. Maintain the backlight brightness.
In addition, higher contrast can be realized by simultaneously performing gradation conversion of low gradation data.

In other words, in the case of a screen that locally concentrates on high gradations (or a screen that requires high contrast) or a screen that has many high gradations overall (or a screen that requires high brightness) By increasing the brightness of the backlight, otherwise maintaining the brightness normal,
The contrast or the dynamic range of the liquid crystal display device can be increased.

Further, according to another embodiment of the present invention, a plurality of specific portions of the display screen are selected, and the characteristics of the displayed image are defined by tracking and observing the change of the image data. Accordingly, the digital AI according to the embodiment of the present invention, that is, whether the function of controlling the backlight by determining whether the video data is a moving image or a still image is determined, and the brightness of the backlight is determined. The level can be controlled.

Further, according to another embodiment of the present invention, it is possible to determine whether or not the digital system can be applied to the AI, thereby controlling the output of the corrected gamma voltage level. By controlling the brightness level of the backlight and the output control of the corrected gamma voltage level, the contrast of the display screen can be adjusted, and the power consumption when the corresponding liquid crystal display device displays a stopped image or the like. Can be saved.

[Brief description of the drawings]

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

FIG. 2 is a diagram for explaining a general number of data for each gradation.

FIG. 3 is a flowchart illustrating a liquid crystal display method according to an embodiment of the present invention.

FIG. 4 is a diagram for explaining luminance by gradation before tuning and luminance by gradation after tuning according to the present invention;

FIG. 5 is a diagram showing gradation tuning in consideration of a luminance change of a backlight according to the present invention.

FIG. 6 is a view illustrating a liquid crystal display according to another embodiment of the present invention.

FIG. 7 is a diagram for explaining a unit cell set according to the present invention.

FIG. 8A is a flowchart illustrating a method of driving a liquid crystal display according to another embodiment of the present invention.

FIG. 8B is a flowchart illustrating a method of driving a liquid crystal display according to another embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 liquid crystal display module 110 LCD panel 120 backlight unit 200 timing control unit 210 data coefficient unit 212 R data coefficient unit 212-1 data discrimination unit 212-3 first counter 212-5 second counter 212-7 first summer 212 -9 2nd summer 214 G data coefficient section 216 B data coefficient section 220 1st summation section 230 2nd summation section 240 Comparison section 241 Brightness control signal 250 Memory control section 251 Gradation conversion control signal 255,286 ROM 260 SRAM section 262 First SRAM 264 Second SRAM 266 Third SRAM 270 Video inquiry section 271 Video discrimination signal 272 Frame coefficient section 274 Storage section 276 Data comparison section 278 Video discrimination section 280 Brightness control section 282 Backlight brightness processing section 284 Memory / ga Ma controller 290 gamma processing unit 300 gate driver 400 data driver 500 for backlight inverters (power converter) 600 gray-scale voltage generating unit

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G09G 3/20 670 G09G 3/20 670J 3/34 3/34 J F-term (Reference) 2H093 NA51 NC34 NC42 ND06 ND07 ND38 5C006 AA01 AA22 AF19 AF44 AF45 AF46 AF51 AF53 AF69 BB16 BB29 BF14 BF22 BF28 EA01 FA18 FA33 FA47 FA54 5C080 AA10 BB05 CC03 DD04 DD26 DD29 EE28 FF11 JJ02 JJ05 JJ07

Claims (30)

[Claims] An LCD comprising: a plurality of gate lines; a plurality of data lines; a switching element connected to the gate line and the data line; and a pixel electrode connected to the switching element and responsive to an operation of the switching element. A panel, a gate driver that sequentially outputs a scanning signal to the gate line, a data driver that outputs an image signal to the data line, a power converter that outputs a predetermined backlight driving voltage, and a rear surface of the LCD panel A backlight unit that outputs predetermined light in response to the application of the backlight drive voltage; receives a video signal and a timing signal input from the outside, and outputs the image signal and the scanning signal. To the data driver and the gate driver respectively. Then, the characteristic of the video signal is determined, and when it is determined that the video signal is a moving image, a high-potential or low-potential voltage back-up is performed depending on whether the video signal requires high-luminance or low-luminance level driving. A light control signal is provided to the power converter to increase or decrease the brightness level of the LCD panel, and a backlight control signal for controlling the output of a certain brightness level to the power converter when it is determined to be a still image. A liquid crystal display device, comprising: a timing control unit for outputting. 2. The liquid crystal display device according to claim 1, wherein the timing controller checks the characteristics of a video signal forming one frame to increase or decrease the brightness level of the LCD panel. 3. The power converter outputs a high-potential voltage to the backlight unit when a high-potential backlight control signal is applied from the timing control unit, and outputs a luminance level of the LCD panel. And when a backlight control signal of a normal potential is applied from the timing control unit, a voltage of a normal potential is output to the backlight unit to maintain the brightness level of the LCD panel. Item 2. The liquid crystal display device according to item 1. 4. The timing control section divides each gradation range into at least three or more gradation level groups for each of the RGB of the video signals, and externally sets one video frame as a reference. R, G, and B image extraction data applied from are counted in the number included in each of the divided gradation level groups,
The liquid crystal display device according to claim 2, wherein the backlight control signal is output to the power converter in accordance with a result of comparing each count value. 5. The timing control unit applies a high drive voltage to the power converter in one video frame unit to increase brightness when the count value in a high gradation range is large. 5. When the count value of the low gradation range is large in the one video frame unit, a normal drive voltage is applied to the power converter in order to maintain brightness. 5.
3. The liquid crystal display device according to 1. 6. A gray-scale voltage generator for controlling the data driver to change data to a lower gray-scale when a low-luminance level luminance control signal is input from the timing controller. Item 2. The liquid crystal display device according to item 1. 7. The timing control unit determines and counts in which range of at least three or more divided gradation levels the RGB image extraction data forming one video frame is included, A data coefficient section for outputting the number of video extraction data of each of the high gradation level RGB and each of the video extraction data of each of the low gradation level RGB; A first summing unit that outputs a summed value; a second summing unit that sums the number of video extracted data of each of the low gradation level RGB to output a second summed value; and the first summed value and the second summed value. Check the ratio of each of the sum values in one image frame, and output the driving voltage of the general mode to the power converter or the driving voltage of the mode brighter than the general mode according to the ratio. The liquid crystal display device according to claim 2, further comprising: a comparison unit configured to output the comparison result. 8. The data coefficient unit receives one of R, G, and B video data provided from the outside and checks the gray level of the video extraction data, A data discriminator that outputs video extraction data and video extraction data of a low gradation level; a first counter that counts the video extraction data of the high gradation level and outputs the count number; A second counter that counts the extracted data and outputs the count number, and counts the count number provided from the first counter in response to one vertical synchronization signal in units of one frame to extract high-level video extraction data. A first adder for summing and outputting the counts, and a count value provided from the second counter, the low grayscale level in units of one frame in response to one vertical synchronization signal. The liquid crystal display device according to claim 7 including a second summing amplifier for outputting the sum of the number of video extracting data. 9. The apparatus according to claim 1, wherein the timing controller checks a characteristic of an image extraction signal constituting one or more unit cells arbitrarily designated in one frame, and increases or decreases a luminance level of the LCD panel. The liquid crystal display device according to claim 1. 10. A timing control unit for checking characteristics of input video data, outputting a video determination signal in accordance with the type of the determined video, and a video inquiry unit based on the video determination signal. The liquid crystal display device according to claim 9, further comprising: a brightness control unit that outputs a backlight control signal corresponding to the backlight brightness signal. 11. The liquid crystal display device according to claim 10, wherein said brightness control section further outputs a signal for controlling gamma voltage. 12. The backlight control signal, when the video discrimination signal is discriminated as the moving picture,
A signal for controlling to perform a brightness increasing function based on the backlight brightness signal, and a signal for controlling to output a certain brightness level when the video determination signal is determined to be the stop video. The liquid crystal display device according to claim 10, wherein: 13. The gamma voltage control signal, wherein the video discrimination signal is discriminated as the moving picture.
Controlling to output a gamma voltage corrected based on the backlight luminance signal, and when the video determination signal is determined to be the stop video, correction is performed irrespective of the backlight luminance signal. The liquid crystal display device according to claim 11, wherein the liquid crystal display device is controlled to output the gamma voltage or a constant value of the gamma voltage. 14. The liquid crystal display device according to claim 1, further comprising a gamma processing unit configured to output the gamma voltage corrected by receiving the gamma voltage control signal or a gamma voltage having a predetermined value to the data driver. 11
3. The liquid crystal display device according to 1. apparatus. 15. The video query unit, wherein: a storage unit for storing the video data; and a first data set corresponding to a plurality of unit cells, each of which is extracted from video data of a k-th frame input from the outside, and Storing the second data set corresponding to the unit cell from the video data of the (k + N) th frame (where N is a positive integer) and storing the second data set in the storage unit; Comparing the first data set and the second data set with a frame coefficient unit that outputs the first data set and the second data set, and outputting a first signal if they are the same, A data comparison unit that outputs a second signal when the first signal is input from the data comparison unit, and outputs a first image determination signal for determining the still image when the first signal is input from the data comparison unit. From comparison section Serial liquid crystal display device according to claim 10 including, a video determination unit for outputting a second image determining signal for determining the moving image in the case where the second signal is input. 16. When the second signal is input from the data comparison unit, the video discrimination unit checks whether all output values of comparison data corresponding to a first direction are the second signal. If all of the signals are the second signals, the second image discrimination signal for judging the moving image is output, and one of the output values of the comparison data corresponding to the first direction is the second signal. If the signal is not a signal, it is checked whether the second signal number of the comparison data is equal to or more than a predetermined number. If the signal is equal to or more than the predetermined number, the second image discrimination signal for judging the moving image is transmitted. The liquid crystal display device according to claim 15, wherein the liquid crystal display device outputs the first video discrimination signal for outputting the still video when the number is less than the predetermined number. 17. The unit cell includes a predetermined pixel block corresponding to a left side of an upper end of the LCD panel, a predetermined pixel block corresponding to a right side of an upper end of the LCD panel, and a left side of a lower end of the LCD panel. The liquid crystal display of claim 9, further comprising at least one of a predetermined pixel block and a predetermined pixel block corresponding to a right side of a lower end of the LCD panel. 18. A plurality of gate lines for transmitting a scanning signal, a plurality of data lines for intersecting the gate line and transmitting an image signal, and formed in a region surrounded by the gate line and the data line. A switching element connected to the gate line and the data line, an LCD panel connected to the switching element and arranged in a matrix with pixel electrodes responsive to the operation of the switching element, and a rear surface of the LCD panel A driving unit for a liquid crystal display device, comprising: a gate driver for sequentially outputting the scanning signal to the gate line; a data driver for outputting the image signal to the data line; and a predetermined backlight. A power converter that outputs a driving voltage; A backlight unit disposed on a rear surface for outputting predetermined light in response to the application of the backlight drive voltage; receiving a video signal and a timing signal input from the outside; receiving the image signal and the scanning signal; And outputs the signals to the data driver and the gate driver, respectively. If the video signal is determined to be a moving image by determining the characteristics of the video signal, the video signal has high brightness or low brightness. By providing a backlight control signal of a high potential or a low potential to the power converter depending on whether level driving is required, the brightness level of the LCD panel is increased or decreased, and a fixed brightness is determined when it is determined that the image is a still image. And a timing control unit that outputs a backlight control signal for controlling a level output to the power converter. 19. The driving device of claim 18, wherein the timing controller checks the characteristics of a video signal forming one frame to increase or decrease the brightness level of the LCD panel. 20. The timing control unit determines and counts which of the at least three divided gray levels the video extracted data of each of RGB constituting one video frame contains, A data coefficient section for outputting the number of image extraction data of each of the high gradation level RGB and the number of image extraction data of each of the low gradation level RGB from the counted levels; A first summation unit that sums the number of data to output a first sum, a second summation unit that sums the number of video extraction data of each of the low gradation level RGB and outputs a second sum, Checking a ratio of each of the first sum and the second sum in one image frame, and outputting a driving voltage of a general mode to the power converter according to the ratio, or 20. The driving device of a liquid crystal display device according to claim 19, further comprising: a comparing unit that outputs a driving voltage in a mode brighter than the general mode. 21. The data coefficient section receives any one of R, G, and B image data provided from the outside, checks a gradation level of image extraction data, and outputs a high gradation level image. A data discriminator that outputs the extracted data and the low gradation level image extraction data; a first counter that counts the high gradation level image extraction data and outputs the count number; A second counter that counts data and outputs the count number, and counts the count number provided from the first counter by the number of image extraction data of a high gray level in one frame unit in response to one vertical synchronization signal. A first adder for summing and outputting the count value provided from the second counter, and a low gradation level in units of one frame in response to one vertical synchronization signal. Driving device for a liquid crystal display device according to claim 20 including a second summing amplifier for outputting the sum of the number of video extracting data. 22. The timing control unit checks the characteristics of video signals constituting one or more unit cells arbitrarily designated from one frame, and
The driving device for a liquid crystal display device according to claim 18, wherein the brightness level of the D panel is increased or decreased. 23. A video query unit for checking characteristics of input video data and outputting a video determination signal according to the type of video determined, based on the video determination signal. 23. The driving device of a liquid crystal display device according to claim 22, further comprising: a brightness control unit that outputs a backlight control signal corresponding to the backlight brightness signal. 24. The video inquiry unit, comprising: a storage unit that stores the video data; and a first data set corresponding to a plurality of unit cells, each of which is extracted from video data of a k-th frame input from the outside, and Storing the second data set corresponding to the unit cell from the video data of the (k + N) th frame (where N is a positive integer) and storing the second data set in the storage unit; Comparing the first data set and the second data set with a frame coefficient unit that outputs a first data set and the second data set, and outputting a first signal if they are the same, A data comparison unit that outputs a second signal when the first signal is input from the data comparison unit, and outputs a first image determination signal for determining the still image when the first signal is input from the data comparison unit. From comparison section Driving device for a liquid crystal display device according to claim 23 including, a video determination unit for outputting a second image determining signal for determining the moving picture in the case of serial second signal. 25. Driving of a liquid crystal display device including a liquid crystal display module including an LCD panel and a backlight unit, a gate driver for outputting a scanning signal to the LCD panel, and a data driver for outputting an image signal to the LCD panel. The method comprises the steps of: (a) dividing image gradation data into at least three or more gradation level groups based on one image frame, and extracting R, G, and B images for each of the divided gradation level groups; Counting data; and (b) checking whether the number of data of the brightest gray level group among the divided gray level groups is greater than or equal to a certain ratio of the entire video extraction data. (C) In the step (b), the number of data of the brightest gradation level group is one of the total number of the video extraction data. If the ratio is greater than or equal to the ratio, it is checked whether the number of data of the darkest gradation level group among the divided gradation level groups is greater than or equal to a certain ratio of the entire video extraction data. (D) in the step (c), when the number of data of the darkest gradation group is equal to or more than a certain ratio of the whole image extraction data, the backlight brightness is maintained normally and the low gradation is maintained. Performing a gradation conversion of data; and a driving method of a liquid crystal display device, comprising: 26. A liquid crystal display device including a liquid crystal display module including an LCD panel and a backlight unit, a gate driver for outputting a scanning signal to the LCD panel, and a data driver for outputting an image signal to the LCD panel. (A) During one frame, the gradation data of the image is divided into groups of high luminance level gradation A, medium luminance level gradation B, and low luminance level gradation C. Counting the key numbers; and (b) A / (A +
B + C) is 0.08 or more and C / A satisfies the first condition of 5 or more. If the first condition is satisfied, the full white luminance is set to the first luminance level. And (c) when the first condition is not satisfied in the step (b), A / (A + B + C) is 0.05 or more and C /
It is checked whether or not A satisfies a second condition of 10 or more. If the second condition is satisfied, the backlight is set so that full white luminance is at a second luminance level darker than the first luminance level. (D) if the second condition is not satisfied in step (c), A / (A + B + C) is equal to or greater than 0.03 and C /
It is checked whether or not A satisfies a third condition of 20 or more. If the third condition is satisfied, the backlight is set so that full white luminance becomes a third luminance level darker than the second luminance level. And (e) when the third condition is not satisfied in the step (d), so that the full-white luminance becomes a fourth luminance level darker than the third luminance level. Controlling the unit; and a driving method of the liquid crystal display device, comprising: 27. Driving of a liquid crystal display device including a liquid crystal display module including an LCD panel and a backlight unit, a gate driver for outputting a scanning signal to the LCD panel, and a data driver for outputting an image signal to the LCD panel. The method comprises: (a) setting a plurality of unit cells; (b) storing a first data set corresponding to each of the unit cells in a k-th frame input from the outside; After the elapse of a frame, a second data set corresponding to each of the unit cells is stored in a (k + N) -th frame, and the first data set and the second data set are compared, and if they are identical, a second data set is stored. Setting a value of 1 and, if different, setting a second value to calculate a plurality of first comparison values; and (d) all of the plurality of first comparison values are the second values. That case, the step of determining input image and moving image, (e) if one certain of the plurality of first comparison value is not the second value, the first of the plurality is the second value
Checking whether the number of comparison values is greater than or equal to a predetermined number; and (f) in step (e) the plurality of first values that are the second values.
If the number of comparison values is equal to or greater than a predetermined number, the input video is determined to be the moving image, and if the number of the plurality of first comparison values that is the second value is less than a predetermined number, the Determining the input image as a still image; and (g) determining whether the input image is the moving image in step (d) or step (f), of the image data to be displayed in one image frame unit. Activating an adaptive luminance increasing function for controlling the luminance of the backlight according to the gradation level and outputting image data; and (h) determining that the input image is the stationary image in the step (f). And (c) deactivating the adaptive enhancement function and outputting image data corresponding to a predetermined reference luminance level. 28. The adaptive luminance increasing function of step (g) includes the steps of: (g-1) dividing image gradation data into at least three or more gradation level groups based on one image frame; Counting the RGB image data for each of the divided gray level groups; and (g-2) the number of data of the brightest gray level group among the divided gray level groups is a fixed number of the entire video data. Checking whether the ratio is equal to or more than a ratio. (G-3) If the number of data of the brightest gradation level group is equal to or more than a certain ratio of the entire video data in step (g-2), Checking whether the number of data of the darkest gradation level group among the divided gradation level groups is equal to or more than a predetermined ratio of the entire video data; and (g-4) step (g-4). In g-3), when the number of data of the darkest gradation group is equal to or more than a certain ratio of the entire video data, the luminance of the backlight is maintained normally and gradation conversion of low gradation data is performed. The driving method of a liquid crystal display device according to claim 27, comprising: 29. The system according to claim 27, wherein the predetermined number is four or more.
3. The method for driving a liquid crystal display device according to item 1. 30. The method of driving a liquid crystal display device according to the following: (i) When (M + N +)
Receiving unit cell data in the first direction in the M) th frame;
If the same as compared to the second data set, the first
Is set, and if different, the second value is set and the second value is set.
Calculating a comparison value; and (j) performing step (i) if all of the second comparison values in step (i) are the second values and the setting screen satisfies the first condition of the moving image. (B) at least once, and feeding back to the step (b) if the first condition is satisfied. (K) If the first condition is not satisfied, the comparison value for the intermediate point among the comparison values Is the first value, and if the setting screen satisfies the second condition of the still image, the step (i) is further performed at least once, and if the second condition is satisfied, the step (b) is performed. 28. The method of claim 27, further comprising: feeding back; and (l) feeding back to the step (i) if the second condition is not satisfied in the step (k). .