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Backlight unit and LCD device using same

A backlight unit and light source technology, applied in optics, nonlinear optics, static indicators, etc., can solve problems such as out-of-synchronization and out-of-synchronization of control waves

Inactive Publication Date: 2009-07-01
LG DISPLAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The control waves may be out of sync, and results such as figure 1 As shown, the light-emitting driving signals Rds, Gds and Bds of red light, green light and blue light are not synchronized

Method used

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  • Backlight unit and LCD device using same
  • Backlight unit and LCD device using same
  • Backlight unit and LCD device using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0015] Reference will now be made in detail to the embodiments, examples of which are illustrated in the accompanying drawings.

[0016] figure 2 is a diagram of a backlight unit 100 according to one embodiment. This backlight unit 100 includes: a light source section 140 having a red light source 142R, a green light source 142G, and a blue light source 142B; Vdim_B drives the red light source 142R, the green light source 142G and the blue light source 142B. Such as image 3 As shown, the common control wave TS may be triangular.

[0017] The red light source 142R is a red light emitting diode that emits red light R. The red light source 142R emits red light according to the red light emission driving signal Rds from the PWM controller 150 . The green light source 142G is a green light emitting diode that emits green light G. The green light source 142G emits green light according to the green light emission driving signal Gds from the PWM controller 150 . The blue lig...

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PUM

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Abstract

A backlight unit and a liquid crystal display device using the backlight unit. The backlight unit includes a light source section having a red light source, a green light source, and a blue light source, and a light source control unit that generates a common control wave and drives each of the red light source, green light source, and blue light source using an external dimming signal and the common control wave. device. The light source controller may include a pulse width modulation controller. The common control wave can be triangular. The common triangular waves generated by the triangular wave generator drive the respective red, green and blue light sources. The size of the PWM controller can be reduced and flicker can be substantially eliminated.

Description

technical field [0001] The present invention relates to a backlight unit, and more particularly, to a backlight unit with reduced flicker. Background technique [0002] Liquid crystal display (hereinafter referred to as "LCD") devices are frequently used due to their lightness, thinness, and low driving power consumption. LCD devices are used in various fields such as office automation equipment, audio / video equipment, and the like. The LCD device controls the transmission amount of light beams according to video signals applied to a plurality of control switches arranged in a rectangle. As a result, a desired picture is displayed on the screen. [0003] An LCD device is not a self-luminous display device, which requires a light source such as a backlight. A backlight unit for an LCD device includes red, green, and blue light sources that emit red, green, and blue light, respectively. This red, green and blue light mixes to produce white light. [0004] The red light so...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/1335
CPCG09G2320/0247G09G2320/064G09G3/3413G02F1/133
Inventor 金秉哲柳连泽
Owner LG DISPLAY CO LTD
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