KR20100019186A - Driving apparatus for liquid crystal display device and method for driving the same - Google Patents

Abstract

PURPOSE: A driving device of LCD display device and a driving method thereof are provided to reduce a color separation phenomenon by decreasing an average chrominance between time-divided subframes. CONSTITUTION: An LCD panel(22) comprises a plurality of unit pixels composed of a first or a third sub pixel. A data driver(24) drives a plurality of datalines. A data conversion unit(30) generates a red, a green, a blue, a cyan color data by using an external red, green, and blue data. A back light(34) comprises at least one light source among light sources consisting of a single fluorescent substance and light sources formed by mixing a plurality of fluorescent substances. A backlight driver(32) successively drives the light sources of the back light. A timing controller(28) controls a gate driver, a data driver and the backlight driver.

Description

DRIVING APPARATUS FOR LIQUID CRYSTAL DISPLAY DEVICE AND METHOD FOR DRIVING THE SAME

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly, to a driving device and a driving method of the liquid crystal display device for improving the image quality of a display image by improving color temperature deviation and color separation.

In general, the liquid crystal display displays an image by adjusting the light transmittance of the liquid crystal cells according to the image signal. In particular, an active matrix type liquid crystal display device is advantageous in that a switching element is formed for each liquid crystal cell to display a moving image. Thin film transistors (TFTs) are mainly used as switching elements.

The liquid crystal display typically implements colors using red (R), green (G), and blue (B). However, in order to widen the color reproduction range and make the color of the display image closer to natural colors, a liquid crystal display device having a quad unit unit pixel having a four primary color filter has been proposed. The unit pixel of the quad structure includes a first sub pixel having a red (R) color filter, a second sub pixel having a cyan (C) color filter, a third sub pixel having a green (G) color filter, and a blue (B). And a fourth sub pixel having a color filter. This quad type liquid crystal display implements a wider color reproduction range than the R, G, and B driving methods by spatially expressing four primary colors by irradiating light from the backlight to each unit pixel. However, in the quad type liquid crystal display, color mixing between sub-pixels is seriously generated, and transmittances of the color filters of green (G) and cyan (C) are particularly low, thereby making it difficult to secure luminance.

To solve this problem, each unit pixel is divided into a first sub pixel having a green (G) color filter and a second sub pixel having a magenta (M) color filter, and red (R), A so-called four primary color implementation method using space-time combination has been proposed to time-divisionally supply four primary color data of cyan (C), green (G), and blue (B).

However, the conventional four primary color liquid crystal display device has a higher light transmittance and luminance than a quad pixel liquid crystal display device. However, similar to the quad type liquid crystal display device, mixed color occurs and color decomposition occurs. There are disadvantages. In addition, the backlight provided in the conventional liquid crystal display devices includes a light emitting diode (LED) such as red (R), cyan (C), green (G), blue (B), or white (W). These individually provided LEDs have different driving characteristics, and thus have large environmental and temporal driving variations due to environmental influences such as ambient temperature. As such, when the driving deviation between the LEDs increases, the color temperature of the display image is distorted, thereby degrading the image quality.

The present invention has been made to solve the above problems, and to provide a driving device and a method of driving the liquid crystal display device to improve the image quality of the display image by improving the color temperature deviation and color separation phenomenon, etc. have.

According to an aspect of the present invention, there is provided a driving apparatus of a liquid crystal display device including: a liquid crystal panel including a plurality of unit pixels including first to third sub pixels; A data driver for driving a plurality of data lines; A data converter configured to generate red, green, blue, and cyan data to be divided and displayed in the first to third sub-pixels by using red, green, and blue data input from the outside; A backlight for irradiating light onto the liquid crystal panel with at least one light source including a light source including a single phosphor and a light source including a plurality of phosphors; A backlight driver for sequentially driving light sources provided in the backlight; And dividing the red, green, blue, and cyan data into first and second subframe units and supplying the data driver to the data driver and time-dividing the liquid crystal panel into the first and second subframe units to display an image. And a timing controller controlling the gate and data drivers and the backlight driver.

The data driver supplies the red data to a first data line corresponding to the first sub pixel and the cyan data to a second data line corresponding to the second sub pixel during the first sub frame period; Supplying the blue data to a third data line corresponding to the third sub pixel; The red data is supplied to the first data line corresponding to the first sub pixel and the green data is supplied to the second data line corresponding to the second sub pixel during the second sub frame period. The blue data is supplied to a third data line corresponding to a pixel.

The backlight includes the plurality of RGB light emitting diodes including a mixture of red, green and blue phosphors, and a plurality of RCB light emitting diodes including a mixture of red, cyan and blue phosphors as the light sources. The plurality of RCB light emitting diodes are turned on in the first sub frame period, and the plurality of RGB light emitting diodes are turned on in the second sub frame period.

The plurality of RGB light emitting diodes and the plurality of RCB light emitting diode blue light emitting chips are used.

The backlight includes a plurality of RB light emitting diodes each having a mixture of red and blue phosphors, a plurality of G light emitting diodes having green phosphors, and a plurality of C light emitting diodes having cyan phosphors as light sources. The plurality of RB light emitting diodes and the plurality of C light emitting diodes are turned on in one sub frame period, and the RB light emitting diodes and the plurality of G light emitting diodes are turned on in a second sub frame period.

In addition, the liquid crystal display market driving method according to an embodiment of the present invention for achieving the above object is a liquid crystal panel having a plurality of unit pixels consisting of first to third sub-pixels and data lines of the liquid crystal panel A driving method of a liquid crystal display device having a data driver for driving, the red, green, blue, and cyan data to be divided and displayed in the first to third sub-pixels using red, green, and blue data input from the outside. Generating a; Irradiating light onto the liquid crystal panel by sequentially driving at least one light source among light sources formed of a single phosphor and light sources formed by mixing a plurality of phosphors; Dividing the red, green, blue, and cyan data into first and second subframe units and supplying the data driver to the data driver; And supplying the red, green, blue, and cyan data to the liquid crystal panel such that the liquid crystal panel time-divisions the first and second sub-frame units to display an image.

The supplying the red, green, blue, and cyan data to the liquid crystal panel may include supplying the red data to a first data line corresponding to the first sub pixel during the first sub frame period and supplying the second sub pixel. Supplying the cyan data to a second data line corresponding to and supplying the blue data to a third data line corresponding to the third sub-pixel; The red data is supplied to the first data line corresponding to the first sub pixel and the green data is supplied to the second data line corresponding to the second sub pixel during the second sub frame period. The blue data is supplied to a third data line corresponding to a pixel.

The driving of the light sources turns on a plurality of RGB light emitting diodes formed by mixing red, green, and blue phosphors in the first sub frame period, and mixes red, cyan, and blue phosphors in the second sub frame period. It is characterized in that the plurality of RCB light emitting diode made.

The driving of the light sources may turn on a plurality of RB light emitting diodes formed by mixing red and blue phosphors in the first sub frame period and a plurality of C light emitting diodes consisting of cyan phosphors, and in the second sub frame period. A plurality of light emitting diodes comprising the RB light emitting diodes and the green phosphors are turned on.

The driving device and the driving method of the liquid crystal display device according to the present invention having the above characteristics can greatly reduce color separation by reducing the average color difference between sub-frames displayed by being time-divided. The color temperature deviation of the image displayed in units of subframes may be improved by the plurality of light sources configured to remain the same.

Hereinafter, a driving apparatus and a driving method thereof of a liquid crystal display according to an exemplary embodiment of the present invention having the above characteristics will be described in detail with reference to the accompanying drawings.

1 is a configuration diagram illustrating a driving device of a liquid crystal display according to an exemplary embodiment of the present invention.

A driving device of the liquid crystal display shown in FIG. 1 includes a liquid crystal panel 22 having a plurality of unit pixels including first to third sub pixels SP1 to SP3; A data driver 24 for driving the plurality of data lines DL1 to DLm; A gate driver 26 for driving the plurality of gate lines GL1 to GLn; Red (R), green (G), blue (B), and cyan to be divided and displayed in the first to third sub-pixels SP1 to SP3 using red (R), green (G), and blue (B) data. A data converter 30 generating color (C) data; A backlight (34) for irradiating light to the liquid crystal panel (22) with at least one light source including a light source consisting of a single phosphor and a light source formed by mixing a plurality of phosphors; The backlight driver 32 sequentially driving the light sources included in the backlight 34 and the red (R), green (G), blue (B), and cyan (C) data are first and second. The gate and data drivers 24 and 26 and the liquid crystal panel 22 to provide an image to the data driver 24 and to time-division the first and second sub-frame units to display an image. A timing controller 28 for controlling the backlight driver 32 is provided.

The liquid crystal panel 22 has a plurality of gate lines GL1 through GLn and a plurality of data lines DL1 through DLm intersecting with each other, and the first through third sub-pixels displaying different colors in the crossing regions. SP1 to SP3) are formed. Here, the first to third sub-pixels SP1 to SP3 adjacent to each other form one unit pixel PX. In other words, each unit pixel PX includes a first subpixel SP1, a second subpixel SP2, and a third subpixel SP3 that display different colors. TFTs formed at the intersections of the respective gate lines GL1 to GLn and the data lines DL1 to DLm are separated from each data line DL1 to DLm in response to scan pulses from the respective gate lines GL1 to GLn. The red (R), green (G), blue (B), and cyan (C) image signals of the first to third sub-pixels SP1 to SP3 are respectively supplied. In other words, the four colors R, G, B, and C generated from the backlight 34 and the four colors R, G, and B supplied to each of the first to third sub-pixels SP1 to SP3. (C) The data is time-divided into first and second sub-frames SF1 and SF2 periods, and a detailed description thereof will be described later with reference to the accompanying drawings.

Each of the sub-pixels SP1 to SP3 includes a pixel electrode and a common electrode formed with a liquid crystal layer interposed therebetween, and the light transmittance is changed by changing a liquid crystal array with an electric field formed between the pixel electrode and the common electrode. Here, each of the first to third sub-pixels SP1 to SP3 includes a color filter for transmitting visible light of different wavelength bands so as to display different colors. Specifically, the red (R) color filter included in the first sub-pixel SP1 transmits the red (R) light among the four colors (R, C, G, and B) light supplied from the backlight 34. The other light is blocked or absorbed, and the blue (B) color filter included in the third sub-pixel SP3 has a blue color among the four colors (R, C, G, B) supplied from the backlight 34. B) transmits light and blocks or absorbs other light. The green (G) color filter included in the second sub-pixel SP2 transmits cyan (C) and green (G) light and blocks or absorbs other lights.

Referring to FIG. 2, the red color filter R_C / F of the first sub-pixel SP1 transmits visible light including the wavelength band of the red (R) light during the first and second sub-frame periods SF1 and SF2. And other light blocks or absorbs. The blue color filter B_C / F of the third sub-pixel SP3 transmits visible light including the wavelength band of the blue (B) light during the first and second sub-frame periods SF1 and SF2 and other light. They block or absorb. In addition, the green (G) color filter included in the second sub-pixel SP2 transmits visible light including the wavelength bands of the green (G) and cyan (C) light, and blocks other light. Will be absorbed.

The data conversion unit 30 stores three primary color data of red (R), green (G), and blue (B) supplied from an external system, for example, an external graphics card (R), green (G), and blue ( Converted into four primary color data of B) and cyan (C). The data conversion method may be any known method that can calculate data in which the color coordinates are enlarged compared to the color coordinates of the input data. For example, in "OPTICAL REVIEW Vol. 8, No. 3 (2001) 191-197" The method proposed by the published author "Takeyuki AJITO et al." And the method disclosed in "Color Conversion Method for Multiprimary Display Using Matrix Switching" may be used.

The timing controller 28 generates control signals such as gate and data control signals GCS and DCS to control driving timings of the gate driver 26 and the data driver 24, and a plurality of dimming controls (not shown). The backlight driver 32 is controlled by generating a dimming control signal or the like. In addition, the timing controller 28 stores four primary color data of red (R), green (G), blue (B), and cyan (C) supplied from the data converter 30 in the first and second subframes ( The data is time-divided in units of SF1 and SF2 and supplied to the data driver 24.

Specifically, the timing controller 28 time-divides one frame period into two sub frame SF1 and SF2 periods as shown in FIGS. 2 and 3, and each subframe SF1 and SF2 period. Is time-divided again into the scan period SCAN, the liquid crystal response period LCres, and the backlight lighting period BLon. The timing controller 28 supplies red (R), cyan (C), and blue (B) data to the data driver 24 during the scan period SCAN of the first sub frame SF1 period, and the second sub The red (R), green (G), and blue (B) data are supplied to the data driver 24 during the scan period SCAN of the frame SF2 period. Such red (R), cyan (C), and blue (B) data and red (R), green (G), and blue (B) data may be supplied to the data driver 24 through separate data buses. have. Here, the frame period is also referred to as a field period, and a screen period in which one screen of data is applied to each unit pixel PX of the liquid crystal panel 22 to display one completed image. This frame period is standardized to 1/60 second (60 Hz) for NTSC and 1/50 second (50 Hz) for PAL.

In the present invention, one frame of data includes four colors of data of red (R), green (G), cyan (C), and blue (B), and red (R) in the first subframe (SF1) period. , A first sub image represented by cyan (C) and blue (B) data, and a second sub image represented by red (R), green (G), and blue (B) data in a second sub frame period SF2. One frame of video is completed.

The gate driver 26 sequentially scans the scan pulse SP for selecting the horizontal line to which data is supplied to the gate lines GL1 to GLn during the scan period SCAN of each sub frame period SF1 and SF2 in FIG. 3. To supply. This scan pulse SP swings between a gate on voltage that is greater than or equal to the threshold voltage of each TFT and a gate off voltage that is less than the threshold voltage. During the scan period in which the scan pulse SP maintains the gate-on voltage, TFTs of one horizontal line are turned on so that data from each data line DL1 to DLm is subpixels of one horizontal line. It is supplied to (SP1 to SP3). In the NTSC system, the period in which the scan pulse SP is supplied to one of the gate lines GL1 to GLn is about 1/120 second, which is the same as the sub frame period, and the scan pulse SP is in each sub frame period SF1 and SF2. The scan period is about (1/120) / n seconds.

The data driver 24 supplies red (R), green (G), cyan (C) and blue (B) supplied from the timing controller 28 during the scan period SCAN of each sub frame period SF1, SF2. The data is converted into an analog image signal and supplied to the data lines DL1 through DLm. Here, red (R), green (G), cyan (C), and blue (B) data to be supplied separately to the first sub-pixel SP1, the second sub-pixel SP2, and the third sub-pixel SP3. Is time-divided into units of the first and second subframes SF1 and SF2 and supplied to the data lines DL1 to DLm by one horizontal line at a timing synchronized with the scan period of the scan pulse SP.

Referring to FIG. 3, the data driver 24 supplies red (R) data by one horizontal line to the 3k-2nd data line (where 1 ≦ k ≦ m / 3) during the first sub frame period SF1. Then, cyan (C) data is supplied one horizontal line to the 3k-1th data line, and blue (B) data is supplied one horizontal line to the 3kth data line. During the second subframe SF2, red (R) data is supplied to the 3k-2th data line (where 1≤k≤m / 3) by one horizontal line, and green (G) data is supplied 3k-1. One horizontal line is supplied to the first data line, and blue (B) data is supplied to the third data line by one horizontal line. In other words, the red (R), cyan (C), and blue (B) data are the respective data lines DL (3k-2) for supplying data to the first to third sub-pixels SP1 to SP3. To DL (3k) for the first sub frame period SF1, and the red (R), green (G), and blue (B) data are used to supply the data to the first to third sub pixels SP1 to SP3. The respective data lines DL (3k-2) to DL (3k) for supplying are supplied during the second sub frame period SF2.

4 is a diagram illustrating the backlight of FIG. 1 in more detail.

Referring to FIG. 4A, the backlight 34 of the present invention includes a plurality of RGB light emitting diodes in which phosphors R_H, G_H, and B_H of red (R), green (G), and blue (B) are mixed. A plurality of RCB light emitting diodes (RCB_LED) formed by mixing (RGB_LED) and phosphors R_H, C_H, B_H of red (R), cyan (C) and blue (B) are provided as a light source.

Specifically, as shown in FIG. 4B, each of the RGB light emitting diodes RGB_LED has red (R), green (G), and blue (B) colors inside a hemispherical lens formed to cover all of the light emitting chips LC. The phosphors R_H, G_H, and B_H are mixed and provided. As a result, each of the RGB light emitting diodes RGB_LED emits three color lights of red (R), green (G), and blue (B). In addition, each of the RCB light emitting diodes RCB_LED is mixed with phosphors R_H, C_H, and B_H of red (R), cyan (C), and blue (B) inside a hemispherical lens formed to cover all the light emitting chips LC. It is provided. Therefore, each of the RCB light emitting diodes RCB_LED emits three colors of red (R), cyan (C), and blue (B) light.

The light emitting chips LC used in the RGB light emitting diode RGB_LED and the RCB light emitting diode RCB_LED have the same driving characteristics, for example, threshold voltages of the same magnitude. Here, the light emitting chip LC, which is equally used for the RGB and RCB light emitting diodes RCB_LED and RGB_LED, may be any one of red (R), green (G), and blue (B) light emitting chips. It is preferable that the blue light emitting chip having the smallest wavelength band is used. This is because the blue light emitting chip having the smallest wavelength band can easily implement red (R), green (G), and cyan (C) lights. As described above, since the plurality of RGB and RCB light emitting diodes (RCB_LED and RGB_LED) included in the backlight 34 of the present invention use the same light emitting chip, the same driving characteristics are responded to all changes in the surrounding environment such as external temperature. Can be maintained.

The RGB and RCB light emitting diodes RCB_LED and RGB_LED of the backlight 34 configured as described above alternately light each other in units of first and second sub-frames SF1 and SF2 under the control of the backlight driver 32. Will occur. In other words, each of the RGB and RCB light emitting diodes RCB_LED and RGB_LED is mutually exposed after the scan period SCAN and the liquid crystal response period LCres of the first and second sub-frame periods SF1 and SF2 as shown in FIG. 3. Alternately generates light.

The backlight driver 32 alternately flashes the RGB and RCB light emitting diodes RCB_LED and RGB_LED of the backlight 34 under the control of the timing controller 28. As described above, the on / off timing of each of the RGB and RCB LEDs RCB_LED and RGB_LED is set differently according to the periods of the first and second subframes SF1 and SF2. In other words, as illustrated in FIG. 3, in the backlight driving period BL0n of the first surf frame period SF1, the RCB light emitting diode RCB_LED is turned on to irradiate light to the liquid crystal panel 22. In the backlight driving period BL0n of the surf frame period SF2, the RGB light emitting diode RGB_LED is turned on to irradiate light to the liquid crystal panel 22.

As illustrated in FIG. 5, light (RB) generated from the RCB light emitting diode (RCB_LED) and transmitted through the liquid crystal panel 2 and light generated from the RCB light emitting diode (RCB_LED) and transmitted to the liquid crystal panel 2 (RGB). ) Are formed within a range of wavelength bands similar to each other and have similar intensities. In addition, since the color difference between cyan (C) and green (G) is substantially very small, subframes of average colors of cyan (C) or green (G) and red (R) and blue (B) are mixed. The color difference between SF1 and SF2) becomes smaller. In other words, as shown in FIG. 6, the separation distance between the average color coordinate m1 of the first subframe SF1 and the average color coordinate m2 of the second subframe SF1 on the standard color coordinates is significantly reduced compared to the conventional method. The color difference between the frames SF1 and SF2 is greatly reduced. Therefore, the liquid crystal display according to the present invention can greatly reduce the color separation phenomenon in the white implementation by reducing the color difference between the subframes SF1 and SF2.

In other words, the driving device and the driving method thereof of the liquid crystal display according to the present invention include red (R), green (G), cyan (C), and blue data (B). SP3) is divided into two sub-frames (SF1, SF2) in units of time division, and the RGB and RCB light emitting diodes (RCB_LED, RGB_LED) of the backlight 34 are alternately linked with the supply timing of the four-color data. By blinking, four primary colors are expressed. Accordingly, the present invention can reduce the color separation phenomenon by reducing the average color difference between the sub-frames (SF1, SF2), RGB and RCB light emitting diodes (RCB_LED, RGB_LED) formed to maintain the same driving characteristics such as threshold voltage The color temperature deviation of the image displayed in every subframe unit SF1 and SF2 can be improved.

FIG. 7 is another configuration diagram illustrating the backlight illustrated in FIG. 1.

Referring to FIG. 7A, a backlight 34 according to another embodiment of the present invention includes a plurality of RB light emitting diodes RB_LED in which phosphors R_H and B_H of red (R) and blue (B) are mixed. And a plurality of G light emitting diodes (G_LED) made of green (G) phosphors (G_H) and a plurality of C light emitting diodes (C_LED) made of phosphors (C_H) of cyan (C) as light sources.

Specifically, as shown in FIG. 7B, each of the RB LEDs RB_LED has red (R) and blue (B) phosphors R_H and B_H inside the hemispherical lens formed to cover all the light emitting chips LC. ) Is provided by mixing. As a result, each of the RB light emitting diodes RB_LED generates red (R) and blue (B) lights. In addition, each of the G light emitting diodes G_LED is provided with a green G phosphor H_H inside a hemispherical lens formed to cover all of the light emitting chips LC. Therefore, each of the G light emitting diodes G_LED emits green light. In addition, each C light emitting diode C_LED includes a cyan phosphor C_H inside a hemispherical lens formed to cover all of the light emitting chips LC. As a result, each of the C light emitting diodes C_LED generates green light.

The light emitting chips LC used in the RB light emitting diode RB_LED, the C light emitting diode C_LED, and the G light emitting diode G_LED have similar driving characteristics, for example, threshold voltages having similar magnitudes. Here, the light emitting chip LC used in the same manner as the RB diodes RB_LED may be any one of red (R), green (G), and blue (B) light emitting chips, but the blue light having the smallest wavelength band of light It is preferable that a light emitting chip is used. This is because the blue light emitting chip having the smallest wavelength band can easily implement red light. As described above, the plurality of RB LEDs RB_LED included in the backlight 34 of the present invention use the blue light emitting chips having the lowest wavelength band instead of the red light emitting chip having the largest wavelength band. In addition, since the wavelength bands of the light emitting chips used for the C light emitting diodes (C_LED) and the G light emitting diodes (G_LED) have a range similar to that of the blue light emitting chip, unlike the red color, the light emitting chips respond to all changes in the surrounding environment such as external temperature. Very similar driving characteristics can be maintained.

The RB light emitting diodes RB_LEDs, C light emitting diodes C_LEDs, and G light emitting diodes G_LEDs of the backlight 34 configured as described above are controlled under the control of the backlight driver 32. SF1, SF2) are divided into units to generate light sequentially. More specifically, referring to FIG. 8, an RB light emitting diode RB_LED is provided during a first subframe SF1 in which red (R), cyan (C), and blue (B) data are supplied to the liquid crystal panel 22. And the C light emitting diodes (C_LEDs) are turned on and the RB light emitting diodes (RB_LEDs) are provided during the second subframe SF2 during which red (R), green (G), and blue (B) data are supplied to the liquid crystal panel 22. ) And the G light emitting diodes (G_LED) are turned on. Therefore, the RB light emitting diodes RB_LEDs are always turned on during the lamp driving period BLon of the first and second subframes SF1 and SF2, and the C light emitting diodes C_LED and the G light emitting diodes G_LEDs are each of the sub LEDs. Lights up alternately according to the frames SF1 and SF2. That is, the C light emitting diodes C_LEDs are turned on during the first subframe SF1 and the G light emitting diodes G_LEDs are turned on during the second subframe SF2.

As described above, the driving apparatus and driving method thereof of the liquid crystal display according to the present invention include red (R), green (G), cyan (C), and blue data (B) in three sub-pixels SP1. To SP3) by dividing into two sub-frames (SF1, SF2) in units of time, and supplying the RB light emitting diodes (RB_LED), C light emitting diodes (C_LED), and G light emitting diodes (G_LEDs) of the backlight 34. Four primary colors are represented by alternately blinking in conjunction with the supply timing of color data. Accordingly, the present invention can significantly reduce color separation by reducing the average color difference between the subframes SF1 and SF2, and maintain RB light emitting diodes (RB_LED) and C light emission in which driving characteristics such as threshold voltages are maintained to be the same. The color temperature deviation of the image displayed in every subframe unit SF1 and SF2 may be improved by the diode C_LED and the G light emitting diode G_LED.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

1 is a configuration diagram showing a driving device of a liquid crystal display according to an exemplary embodiment of the present invention.

2 is a graph showing a color filter of each unit pixel and a transmittance of light passing through each unit pixel in subframe units.

3 is a driving timing diagram for explaining a liquid crystal display driving method according to the present invention.

4 is a block diagram showing a backlight of the present invention shown in FIG.

FIG. 5 is a graph showing unit pixel transmittance of light generated from the light sources shown in FIG. 4; FIG.

6 is a diagram illustrating color differences between subframes according to the present invention;

FIG. 7 is another configuration diagram illustrating the backlight shown in FIG. 1. FIG.

FIG. 8 is a driving timing diagram for explaining a method of driving the backlight shown in FIG. 7.

<Simple explanation of the code | symbol about the main part of drawing>

22: liquid crystal panel 24: data driver

26: gate driver 28: timing controller

30: data converter 32: backlight driver

34: backlight LC: light emitting chip

Claims (10)

A liquid crystal panel including a plurality of unit pixels including first to third sub pixels; A data driver for driving a plurality of data lines; A data converter configured to generate red, green, blue, and cyan data to be divided and displayed in the first to third sub-pixels by using red, green, and blue data input from the outside; A backlight for irradiating light onto the liquid crystal panel with at least one light source including a light source including a single phosphor and a light source including a plurality of phosphors; A backlight driver for sequentially driving light sources provided in the backlight; And The gate divides the red, green, blue, and cyan data into first and second subframe units and supplies the data driver to the data driver, and the liquid crystal panel time-divisions the first and second subframe units to display an image. And a timing controller for controlling the data driver and the backlight driver. The method of claim 1, The data driver The red data is supplied to a first data line corresponding to the first sub pixel and the cyan data is supplied to a second data line corresponding to the second sub pixel during the first sub frame period. Supplying the blue data to a third data line corresponding to the sub pixel; The red data is supplied to the first data line corresponding to the first sub pixel and the green data is supplied to the second data line corresponding to the second sub pixel during the second sub frame period. And the blue data is supplied to a third data line corresponding to a pixel. The method of claim 1, The back light The light sources include a plurality of RGB light emitting diodes formed by mixing red, green, and blue phosphors, and a plurality of RCB light emitting diodes formed by mixing red, cyan, and blue phosphors. And a backlight driver turns on the plurality of RCB light emitting diodes in the first sub frame period, and turns on the plurality of RGB light emitting diodes in the second sub frame period. The method of claim 3, wherein And the plurality of RGB light emitting diodes and the plurality of RCB light emitting diode blue light emitting chips. The method of claim 1, The back light The light source includes a plurality of RB light emitting diodes each having a mixture of red and blue phosphors, a plurality of G light emitting diodes having a green phosphor, and a plurality of C light emitting diodes having a cyan phosphor.  The plurality of RB light emitting diodes and the plurality of C light emitting diodes are turned on in the first sub frame period, and the RB light emitting diodes and the plurality of G light emitting diodes are turned on in the second sub frame period. Drive of display device. A driving method of a liquid crystal display device having a liquid crystal panel including a plurality of unit pixels including first to third sub pixels and a data driver for driving data lines of the liquid crystal panel, Generating red, green, blue, and cyan data to be divided and displayed in the first to third sub-pixels by using red, green, and blue data input from the outside; Irradiating light onto the liquid crystal panel by sequentially driving at least one light source among light sources formed of a single phosphor and light sources formed by mixing a plurality of phosphors; Dividing the red, green, blue, and cyan data into first and second subframe units and supplying the data driver to the data driver; And And supplying the red, green, blue, and cyan data to the liquid crystal panel such that the liquid crystal panel time-divisions the first and second sub-frame units to display an image. . The method of claim 6, Supplying the red, green, blue, and cyan data to the liquid crystal panel The red data is supplied to a first data line corresponding to the first sub pixel and the cyan data is supplied to a second data line corresponding to the second sub pixel during the first sub frame period. Supplying the blue data to a third data line corresponding to the sub pixel; The red data is supplied to the first data line corresponding to the first sub pixel and the green data is supplied to the second data line corresponding to the second sub pixel during the second sub frame period. The blue data is supplied to a third data line corresponding to a pixel. The method of claim 6, The driving step of the light sources Lighting a plurality of RGB light emitting diodes formed by mixing red, green, and blue phosphors in the first sub frame period, And a plurality of RCB light emitting diodes which are formed by mixing red, cyan and blue phosphors in the second sub frame period. The method of claim 8, And the plurality of RGB light emitting diodes and the plurality of RCB light emitting diode blue light emitting chips. The method of claim 6, The driving step of the light sources Lighting a plurality of RB light emitting diodes formed by mixing red and blue phosphors in the first sub frame period and a plurality of C light emitting diodes consisting of cyan phosphors; And a plurality of G light emitting diodes each consisting of the RB light emitting diode and a green phosphor in the second sub frame period.

Images