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Brightness regulating method and equipment for LCD

A liquid crystal display, brightness adjustment technology, applied in static indicators, cathode ray tube indicators, instruments, etc., can solve the problems of high cost, easy to produce abnormal sound, and easy to interfere with the picture.

Inactive Publication Date: 2004-01-14
CHUNTEX ELECTRONICS
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Problems solved by technology

[0004] (2) Pulse mode (Burst Mode): This is to adjust the current of the lamp tube in the way of pulse width modulation (PWM) to achieve brightness control, and its advantage is that the brightness ratio of the display is greatly increased to 10:1~15: 1. However, because the working current is in the PWM mode and the frequency falls in the audio range (about 150Hz~300Hz), the screen is easily disturbed and the audio frequency noise is easy to occur; although the brightness ratio is increased to more than 10:1, it is generally used The most commonly used brightness ratio is about 5:1, which is enough. Since this method is a high-cost control method, the competitiveness of its products is relatively greatly weakened.
Assuming that the Gain of the LCD panel is 100%, 60% of it must be reserved for Brightness adjustment, and its Contrast part is only 40% for adjustment, thus sacrificing the contrast effect on the LCD screen

Method used

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  • Brightness regulating method and equipment for LCD
  • Brightness regulating method and equipment for LCD
  • Brightness regulating method and equipment for LCD

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Embodiment Construction

[0022] see figure 1 As shown, the brightness adjustment device of the liquid crystal display of the present invention controls a PWM control unit 20 with a microprocessor 10, and utilizes the output pulse waves of different widths of the PWM control unit 20 to adjust the output current of the lamp converter (inverter) 30, and then the brightness presented by the liquid crystal panel 50 can be changed. In addition, the microprocessor 10 can also control a voltage level regulator 40 at the same time, and directly control the shading degree of the liquid crystal panel 50 by using different DC levels output .

[0023] see figure 2 As shown, when the adjustment technology of the present invention is used to implement, the characteristic curve of the brightness (Luminance) of the display to the brightness adjustment value (Adjust value), wherein the brightness adjustment value of the horizontal axis can be regarded as the operation screen on the display ( The brightness adjustabl...

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Abstract

The invention relates to the method and apparatus for adjusting liquid crystal display brightness, characterized by that the brightness of the display is divided into a plurality of stages, during the high brightness stage the linear mode is used to control the intensity of the tube so a good color tracking effect is obtained, while during the low brightness stage the digital control mode is used to regulate the shading degree of the liquid crystal panel for improving the brightness ratio of the overall display, wherein during the medium brightness stage the tube and the liquid crystal panel are adjusted simultaneously, thus the brightness control characteristic curve can link the high and low intensity control smoothly.

Description

(1) Technical field [0001] The invention relates to a method and device for adjusting brightness of a liquid crystal display. (2) Background technology [0002] The brightness adjustment methods currently used in liquid crystal displays are usually adjusted for either the light source lamp or the LCD panel, and the control of the light source lamp includes the following methods: [0003] (1) Linear Mode: In a liquid crystal display, its light source comes from a lamp tube arranged behind the liquid crystal panel, and this method directly adjusts the overall brightness of the display by changing the luminous intensity of the lamp tube , where the luminous intensity of the lamp is proportional to the current intensity. The advantage of this method is that the control current intensity is a linear adjustment, and it is only adjusted for the light source lamp without involving the control of the LCD panel, so the display has better color tracking (color tracking) effect, but th...

Claims

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Application Information

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IPC IPC(8): G09G5/10
Inventor 凌育平冷中明
Owner CHUNTEX ELECTRONICS
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