Automatic light intensity control equipment and method in liquid crystal display equipment

A technology of automatic brightness control and brightness control, applied in static indicators, components of color TVs, components of TV systems, etc., can solve the problems of increased power consumption, increased brightness, and the inability of the picture to be very bright.

Inactive Publication Date: 2002-07-31
SAMSUNG DISPLAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, the conventional brightness control scheme may cause a problem of increased power consumption due to uniform maintenance of brightness regardless of bright and dark changes between frames or rapid changes of pictures or frames in moving images, for example.
In addition,

Method used

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  • Automatic light intensity control equipment and method in liquid crystal display equipment
  • Automatic light intensity control equipment and method in liquid crystal display equipment
  • Automatic light intensity control equipment and method in liquid crystal display equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The LCD device according to the present invention automatically controls the brightness of the backlight according to the duty ratio signal generated in proportion to the average gray level of pixels to be displayed in the LCD device.

[0041] image 3 It is a block diagram showing the brightness control scheme of the LCD module backlight according to the first preferred embodiment of the present invention, which is applied to a portable computer or a desktop computer. refer to image 3 , the LCD module includes a timing controller 400, including a duty controller 420, which is used to calculate the average value of the gray level in a horizontal line period, that is, 1H, for a picture or frame to be displayed on the LCD module, and generating a duty ratio signal DUTY corresponding to the calculated gray scale average; and an R-C circuit 500 for summing the duty ratio signal DUTY generated from the timing controller 400 in units of 1H during one frame, and The variabl...

Embodiment 2

[0057] According to another aspect of the present invention, the LCD module controls the backlight by generating a variable brightness control voltage having a duty cycle corresponding to the color state of the pixel data from the duty controller, and responding to the variable brightness control voltage, i.e. The current intensity of the fluorescent lamp automatically controls the brightness of the backlight. Alternatively, the LCD module may be arranged to generate a variable brightness control with a duty cycle corresponding to the average gray level of the pixel data from the duty controller, and the color state of the pixel data as described with reference to the first embodiment. Voltage.

[0058] refer to Figure 7 , add the brightness values ​​of green (G), red (R) and blue (B) together to get the brightness value of white. For example, if the luminance values ​​of the three colors are 73.62, 29.45, and 21.24, respectively, then the total luminance value of white is ...

Embodiment 3

[0084] The LCD module of the present invention can perform user-requested brightness control and automatic brightness control for each picture. To this end, the LCD module of the present invention includes a merged circuit that accommodates these two control functions without conflict. The structure of the LCD module including the merging circuit will now be described.

[0085] Figure 11 is a block diagram showing the backlight brightness control scheme of the LCD module according to the third embodiment of the present invention when it is used as a display device in a portable computer or a desktop computer. Referring to the drawings, in addition to responding to the brightness control voltage CTL_V generated by the CPU of the computer or the main body 200 and the duty ratio signal DUTY generated by the duty controller 420 in the timing controller 400, a variable brightness control output from the R-C circuit 500 is generated. voltage Vduty outside of the combining circuit...

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PUM

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Abstract

An LCD device having a backlight generates a backlight brightness control signal in response to a duty rate signal corresponding to an average gray level or/and a color state of image data to be displayed on the LCD device and a brightness control voltage generated from the main body of the computer by user, and controls a brightness of the backlight automatically according to the backlight brightness control signal.

Description

technical field [0001] The present invention relates to liquid crystal display (LCD) devices, and more particularly to automatic brightness control devices and methods for use in LCDs. Background technique [0002] LCD or Thin Film Transistor Liquid Crystal Display (TFT-LCD) modules are commonly used as display devices in systems such as portable computers, televisions and monitors. figure 1 The structure of a general LCD module 100 is shown. now refer to figure 1 , the LCD module 100 includes an LCD panel 10 containing liquid crystal material between two glass substrates for displaying all types of information; a drive unit containing drive circuits 20, 30 for driving the LCD panel 10 and for generating control The signal controls the timing controller 40 of the driving circuit 20, 30; the backlight 60 is used to guide the light to the LCD panel 10; and the base (not shown) is used to fix and protect the various parts of the LCD panel 10 and the b...

Claims

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Application Information

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IPC IPC(8): G02F1/133G09G3/20G09G3/34G09G3/36H04N5/66H05B41/40H05B41/42
CPCG09G2320/0613G09G2360/16G09G3/3413G09G2330/021G09G2320/0653G09G3/2011G09G2320/0238G09G2320/064G09G2320/0606G09G3/3406G09G2320/0276
Inventor 文胜焕金相洙朴东园崔炯培
Owner SAMSUNG DISPLAY CO LTD
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