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Light source driver module and circuit

A light source drive circuit and drive module technology, which is applied to light sources, point light sources, optics, etc., can solve the problems of uneven brightness and uneven color of the backlight source of the liquid crystal display panel

Inactive Publication Date: 2012-08-08
CHUNGHWA PICTURE TUBES LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

Therefore, when the light emitting diode series is used as the light source of the backlight module of the liquid crystal display panel, it often leads to the defective phenomenon of non-uniform coloring (Mura) of the liquid crystal display panel due to uneven brightness of the backlight.

Method used

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  • Light source driver module and circuit
  • Light source driver module and circuit
  • Light source driver module and circuit

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Embodiment Construction

[0037] Certain terms are used in the specification and subsequent claims to refer to particular elements. It should be understood by those skilled in the art that manufacturers may refer to the same element by different terms. This description and subsequent patent applications do not use the difference in name as the way to distinguish components, but the difference in function of the components as the basis for distinction. "Includes" mentioned throughout the specification and subsequent claims is an open-ended term, so it should be interpreted as "including but not limited to". In addition, the term "electrical connection" here includes any direct and indirect electrical connection means. Therefore, if it is described that a first device is electrically connected to a second device, it means that the first device may be directly connected to the second device, or indirectly connected to the second device through other devices or connection means.

[0038] Please refer to ...

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Abstract

The invention relates to a light source driver circuit, which comprises a voltage signal source and a current source for improving temperature effect, and is used for adjusting the brightness of a light-emitting diode serial. The first end of the light-emitting diode serial is electrically connected to a ground terminal. The current source for improving the temperature effect comprises an adjustable bias voltage source used for outputting an adjustable voltage, a current source controlled by the voltage and used for outputting current according to the voltage signal source, and a feedback circuit which is electrically connected between the second end of the light-emitting diode serial and the adjustable bias voltage source, and is used for controlling the voltage output by the adjustable bias voltage source according to the voltage of the second end of the light-emitting diode serial.

Description

technical field [0001] The invention relates to a light source driving circuit and module, in particular to a light source driving circuit and module which provide constant current and improve temperature effect. Background technique [0002] The application of a light emitting diode (Light Emitting Diode, LED) as a light source is becoming more and more common. For example, most of the backlight modules of traditional liquid crystal display panels use cold cathode fluorescent lamps (coldcathode fluorescent lamp, CCFL) as light sources. Nowadays, as the luminous efficiency of light-emitting diodes continues to increase and the cost decreases, light-emitting diodes gradually replace cold cathode fluorescent tubes as light sources for backlight modules. [0003] In the prior art, a plurality of light emitting diodes are often connected in series to reduce the number of required driving circuits and reduce the total driving current of the light emitting diodes. However, due t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/13357F21Y101/02F21Y115/10
Inventor 陈建仰林琦修林信彰谢博坤
Owner CHUNGHWA PICTURE TUBES LTD
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