KR20030049829A - Liquid crystal display and operating method for thereof - Google Patents

Abstract

PURPOSE: A liquid crystal display and a method of driving the liquid crystal display are provided to drive light sources of a back light sequentially or simultaneously according to a display mode of received video data to efficiently display a color image and a black-and-white image. CONSTITUTION: A liquid crystal display includes a system interface(310), a color/black-and-white judgement unit(320), a memory(330), a memory controller(340), and a timing controller(350). The system interface receives video data, and the color/black-and-white judgement unit judges whether the received video data is color video data or black-and-white video data. The memory stores data of a color image received by the system interface. The memory controller controls the operation of the memory. The timing controller sequentially drives R, G and B light sources of a back light when the received video data is color video data and simultaneously drives the light sources when the received video data is black-an-white video data.

Description

Liquid crystal display and driving method

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display, and in particular, in driving a field sequential LCD, a liquid crystal display capable of converting and displaying a color image and a black and white image according to a display mode of received image data. An apparatus and a driving method thereof are provided.

In the field sequential liquid crystal display, in order to display an image, three primary colors (red, green, blue) provided in the backlight are sequentially used without using a color filter of red, green, and blue. By driving in the above, a driving method capable of displaying colors by using the afterimage effect of the human eye is used.

1 is a block diagram schematically illustrating a light source driver of a conventional field sequential liquid crystal display.

Referring to FIG. 1, a light source driver of a conventional field sequential liquid crystal display device stores a system interface 110 receiving RGB data for displaying an image, and RGB data received from the system interface 110. Each of red constituting each frame for displaying a screen among the memory 120, the memory controller 130 controlling the operation of the memory 120, and the RGB data stored in the memory 120. ), And a timing controller 140 extracting data for green (G) and blue (B) colors to drive the respective red (R), green (G), and blue (B) light sources of the backlight.

Next, a driving method of displaying a color image in the field sequential liquid crystal display having the above configuration will be described with reference to FIG. 2. FIG. 2 is a diagram illustrating a method of driving each light source to display a color image in the conventional field sequential liquid crystal display shown in FIG. 1.

Referring to FIGS. 1 and 2, first, the system interface 110 receives RGB data for displaying an image. In addition, the RGB data received by the system interface unit 110 is stored in the memory 120.

Accordingly, the timing controller 140 controls the red, green, and blue colors of the RGB data stored in the memory 120 to form a frame for displaying a screen. It is possible to display the received color image by extracting the data of the data, adjusting the timing according to each RGB data, and driving each of the red (R), green (G), and blue (B) light sources of the backlight.

That is, the driving timing of the red (R) light source of the backlight is, as shown in FIG. 2, the TFT scanning time (R TFT Scan) time by the red (R) data under the control of the timing controller 140 (t _TFT). ), And the timing is adjusted in consideration of the alignment time (t _LC ) of the liquid crystal panel with respect to the red (R) color display, and when the alignment of the liquid crystal panel for the red (R) color display is completed, the red (R) light source is driven. (R light flash).

In this same manner, the driving timing of each green (G) light source and blue (B) light source of the backlight is aligned with the liquid crystal panel for the green (G) color display and the liquid crystal panel for the blue (B) color display, respectively. After that, driving to the green (G) light source and the blue (B) light source is performed, respectively.

As described above, the field sequential liquid crystal display device displays the color color using the afterimage effect of the human eye as the red (R) / green (G) / blue (B) light sources are sequentially driven.

On the other hand, in the field sequential liquid crystal display, in some cases, not only the display of the color image but also the display of the image in black and white occurs. The present invention proposes a method for efficiently converting and displaying a color image and a black and white image in a field sequential liquid crystal display.

The present invention was created in view of the above-described conditions, and according to the display mode (color or black and white) of the received image data, by sequentially or simultaneously driving each light source of the backlight, it is efficiently switched to a color image and a black and white image. It is an object of the present invention to provide a liquid crystal display device capable of displaying and a driving method thereof.

1 is a block diagram schematically illustrating a light source driver of a conventional field sequential liquid crystal display;

FIG. 2 is a view showing a method of driving each light source to display a color image in the field sequential liquid crystal display shown in FIG.

3 is a schematic view of a light source driver of a field sequential liquid crystal display according to the present invention;

4 and 5 illustrate an example of a method of driving each light source to display a black and white image in the field sequential liquid crystal display according to the present invention.

<Explanation of symbols for the main parts of the drawings>

110, 310 ... System interface 120, 330 ... Memory

130, 340 ... memory control 140, 350 ... timing control

320 ... color / monograph

In order to achieve the above object, the liquid crystal display device according to the present invention,

A system interface unit receiving image data for displaying an image;

A color / monochrome determination unit that determines whether the image data received from the system interface unit is color image data or black and white image data;

A memory configured to store data about a color image received by the system interface unit according to the determination of the color / monochrome determination unit;

A memory controller which controls an operation of the memory; And

When the image data received by the system interface unit is a color image according to the determination by the color / monochrome determination unit, each of the red (R), green (G), and blue (B) light sources of the backlight is sequentially driven. A timing controller for simultaneously driving a red (R) / green (G) / blue (B) light source of a backlight when the image data received from the system interface unit is a black and white image; Its features are to include.

Here, when the image data received from the system interface unit is a black and white image, the clock signal supplied to the memory and the memory controller is cut off, the operation of the memory and the memory controller is stopped, and the image is transmitted to the timing controller. The data is characterized in that it is provided from the color / monochrome determination unit.

In addition, when the image data received from the system interface unit is a black and white image, the power supplied to the memory and the memory control unit is cut off, the operation of the memory and the memory control unit is stopped, and the image data transmitted to the timing control unit. Is characterized in that it is provided from the color / monochrome determination unit.

In addition, the driving method of the liquid crystal display device according to the present invention in order to achieve the above object,

Receiving image data for displaying an image;

Determining whether the received image data is color image data or black and white image data; And

If the received image data is a black and white image, adjusting timing according to the received black and white image data to simultaneously drive a red (R) / green (G) / blue (B) light source of a backlight; Its features are to include.

In addition, another driving method of the liquid crystal display device according to the present invention in order to achieve the above object,

Receiving image data for displaying an image;

Determining whether the received image data is color image data or black and white image data;

Storing RGB data of the received image in a memory; And

When the received image data is a black and white image, data of each of red (R), green (G), and blue (B) colors constituting a frame for displaying a screen among the RGB data stored in the memory Extracting and adjusting the timing according to the respective RGB data to simultaneously drive the red (R) / green (G) / blue (B) light source of the backlight.

According to the present invention, according to the display mode (color or black and white) of the received image data, by sequentially or simultaneously driving each light source of the backlight, there is an advantage that can be efficiently converted to the color image and black and white image to display .

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a view schematically illustrating a light source driver of a field sequential liquid crystal display according to the present invention. Here, FIG. 3A illustrates a light source driver corresponding to the color mode, and FIG. 3B illustrates a light source driver corresponding to the black and white mode.

Referring to FIG. 3, the light source driving unit of the field sequential liquid crystal display according to the present invention includes: a system interface unit 310 receiving image data for displaying an image; A color / monochrome determination unit 320 for determining whether the image data received by the system interface unit 310 is color image data or black and white image data; A memory 330 for storing data on a color image received by the system interface unit 310 according to the determination of the color / monochrome determination unit 320; A memory controller 340 for controlling an operation of the memory 330; And when the image data received by the system interface unit 310 is a color image according to the determination by the color / monochrome determination unit 320, each of red (R), green (G), and blue ( B) When the light source is sequentially driven, and the image data received from the system interface unit 310 is a black and white image, the timing of simultaneously driving the red (R) / green (G) / blue (B) light source of the backlight at the same time. The controller 350; It includes.

Next, a driving method for displaying color / monochrome images in the field sequential liquid crystal display having the above configuration will be described with reference to FIGS. 4 and 5. 4 and 5 illustrate examples of driving each light source to display color / monochrome images in the field sequential liquid crystal display according to the present invention.

<First Embodiment>

First, a process of displaying a color image in the field sequential liquid crystal display according to the present invention will be described with reference to FIGS. 3A and 4. The system interface 310 receives image data for displaying an image. . Then, the color / monochrome determination unit 320 determines whether the received image data is color image data or black and white image data.

In this case, when the received image data is a color image as a result of the determination by the color / monochrome determination unit 320, the system interface unit 310 as described with reference to FIG. The RGB data received at) is stored in the memory 330.

In addition, the timing controller 350 is configured to perform red, green, and blue colors for constituting a frame for displaying a screen among the RGB data stored in the memory 330. By extracting the data, adjusting the timing according to each RGB data, and sequentially driving each of the red (R), green (G), and blue (B) light sources of the backlight, it is possible to display the received color image. .

Meanwhile, as a result of the determination by the color / monochrome determiner 320, when the received image data is a black and white image, the color / monochrome determiner 320 stores the received image data in the memory 330. Instead, the data is transmitted to the timing controller 350 (see FIG. 3 (b)).

Accordingly, the timing controller 350 adjusts the timing according to the received black and white image data, and simultaneously displays the black and white image by driving the red (R), green (G), and blue (B) light sources of the backlight. do.

That is, the driving timing for each light source of the backlight is, as shown in FIG. 4, the TFT scan time t _TFT by the monochrome image data and the monochrome image under the control of the timing controller 350. The timing is adjusted to account for the alignment time (t _LC ) of the liquid crystal panel for display, and when the alignment of the liquid crystal panel for monochrome image display is completed, the red (R) / green (G) / blue (B) light source is driven simultaneously. (White light flash).

In this case, when the image data received from the system interface unit 310 is a black and white image, the clock signal supplied to the memory 330 and the memory controller 340 is cut off, and the memory 330 and By stopping the operation of the memory controller 340, power consumption may be reduced.

In addition, when the image data received from the system interface unit 310 is a black and white image, the power supplied to the memory 330 and the memory control unit 340 is cut off, so that the memory 330 and the memory control unit 340 By halting the operation, the power consumption can be reduced.

Second Embodiment

Meanwhile, in the field sequential liquid crystal display according to the present invention, a color / monochrome image may be displayed through the method shown in FIG. 5.

First, the system interface 310 receives image data for displaying an image. Then, the color / monochrome determination unit 320 determines whether the received image data is color image data or black and white image data.

In this case, when the received image data is a color image as a result of the determination by the color / monochrome determination unit 320, the color image is displayed through the driving method as described in FIG. 4.

As a result of the determination by the color / monochrome determination unit 320, even when the received image data is a black and white image, the RGB data for the received image is stored in the memory 330.

Accordingly, the timing controller 350 is configured to apply the colors of red (R), green (G), and blue (B) to form a frame for displaying a screen among the RGB data stored in the memory 330. It is possible to display a black-and-white image by simultaneously extracting the data of the data, adjusting the timing according to each RGB data, and simultaneously driving the red (R) / green (G) / blue (B) light source of the backlight.

That is, the driving timing of each light source of the backlight, as shown in Figure 5, by the control of the timing control unit 350, the red (R) TFT scan by the data (R TFT Scan) time (t _TFT) and, The timing is adjusted to account for the alignment time (t _LC ) of the liquid crystal panel with respect to the red (R) color display, and when the alignment of the liquid crystal panel for the red (R) color display is completed, red (R) / green (G) / The blue (B) light source is driven at the same time (White light flash).

In this same manner, after the alignment of the liquid crystal panel for the green (G) color display and the liquid crystal panel for the blue (B) color display, respectively, the red (R) / green (G) / blue (B) light source Are driven simultaneously (White light flash).

According to the liquid crystal display and the driving method thereof according to the present invention as described above, according to the display mode (color or black and white) of the received image data, by driving each light source of the backlight sequentially or simultaneously, a color image and a black and white image It can be converted and displayed efficiently.

In addition, according to the liquid crystal display and the driving method thereof according to the present invention, there is no need to use a memory for storing the received image data in displaying a black and white image, there is an advantage that the power consumption can be reduced.

Claims (5)

A system interface unit receiving image data for displaying an image; A color / monochrome determination unit that determines whether the image data received from the system interface unit is color image data or black and white image data; A memory configured to store data about a color image received by the system interface unit according to the determination of the color / monochrome determination unit; A memory controller which controls an operation of the memory; And When the image data received by the system interface unit is a color image according to the determination by the color / monochrome determination unit, each of the red (R), green (G), and blue (B) light sources of the backlight is sequentially driven. A timing controller for simultaneously driving a red (R) / green (G) / blue (B) light source of a backlight when the image data received from the system interface unit is a black and white image; Liquid crystal display comprising a. The method of claim 1, When the image data received from the system interface unit is a black and white image, the clock signal supplied to the memory and the memory controller is blocked to stop the operation of the memory and the memory controller, and the image data transmitted to the timing controller is And a color / monochrome determination unit. The method of claim 1, When the image data received from the system interface unit is a black and white image, the power supplied to the memory and the memory controller is interrupted to stop the operation of the memory and the memory controller, and the image data transmitted to the timing controller is A liquid crystal display device provided from a color / monochrome determination unit. Receiving image data for displaying an image; Determining whether the received image data is color image data or black and white image data; And If the received image data is a black and white image, adjusting timing according to the received black and white image data to simultaneously drive a red (R) / green (G) / blue (B) light source of a backlight; Method of driving a liquid crystal display device comprising a. Receiving image data for displaying an image; Determining whether the received image data is color image data or black and white image data; Storing RGB data of the received image in a memory; And When the received image data is a black and white image, data of each of red (R), green (G), and blue (B) colors constituting a frame for displaying a screen among the RGB data stored in the memory Extracting and adjusting timing according to respective RGB data to simultaneously drive a red (R) / green (G) / blue (B) light source of the backlight; Method of driving a liquid crystal display device comprising a.