Liquid crystal display, backlight module and drive method thereof

A backlight module and light source technology, applied in static indicators, light sources, instruments, etc., can solve problems such as arcs and affect the safety of liquid crystal displays 2, and achieve the effect of avoiding malfunctions

Active Publication Date: 2009-12-09
QISDA SUZHOU +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, if the light tube of the light source 250 has an open-circuit failure, the backlight module 200 cannot be turned off, and the transf...

Method used

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  • Liquid crystal display, backlight module and drive method thereof
  • Liquid crystal display, backlight module and drive method thereof
  • Liquid crystal display, backlight module and drive method thereof

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Embodiment Construction

[0014] In order to have a further understanding of the purpose, structure, features, and functions of the present invention, the following detailed descriptions are provided in conjunction with the embodiments.

[0015] Please refer to image 3 , image 3 It is a functional block diagram of a liquid crystal display 3 of the present invention. The liquid crystal display 3 includes a backlight module 300 and a signal generator 360 for dynamic open-circuit protection. The backlight module 300 includes a light source 350 , a transformer 310 for driving the light source 350 , a power control circuit 320 , an open circuit protection circuit 330 and a dynamic compensation circuit 340 . The light source 350 may include parallel-connected lamp tubes LAMP 1 ~LAMP N , the potential of the input terminal of the light source 350 is determined by the feedback voltage V FB to represent, and the brightness of each lamp is respectively related to the lamp current I L1 ~I LN value. The ...

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Abstract

The invention relates to a liquid crystal display, a backlight module and a drive method thereof. In order to provide open-circuit protection for the backlight module, a quasi open-circuit voltage is firstly generated according to the current flowing through a light source; if the backlight module receives a model signal corresponding to a high contrast mode, a compensating voltage is added into the quasi open-circuit voltage to generate a reference voltage; and if the reference voltage is higher than a feedback voltage at an input end of a feedback self light source, a drive voltage is output to the light source. By the invention, the false operation for an open-circuit protection circuit can be avoided.

Description

technical field [0001] The invention relates to a liquid crystal display, a backlight module and a driving method thereof, in particular to a liquid crystal display providing dynamic open circuit protection, a backlight module and a driving method thereof. Background technique [0002] A liquid crystal display (LCD) has the characteristics of light and thin appearance, low power consumption, and no radiation pollution, and has been widely used in information products. In order to adjust the brightness and contrast of the liquid crystal display, the prior art is to control the driving voltage or current of the light source in the backlight module of the liquid crystal display. The high-end display uses dynamic contrast ratio (DCR) technology to greatly increase the contrast ratio of the liquid crystal display, for example, from 500:1 to 50000:1. The dynamic contrast technology detects the image brightness of the input signal by the image processing system, and then dynamical...

Claims

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Application Information

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IPC IPC(8): H05B41/14H05B41/36H02H3/12G09G3/36
Inventor 林永峻王博文阙锦盛曾俊伟
Owner QISDA SUZHOU
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