Circuit for controlling light sources, method and display system

A light source and circuit technology, applied in the field of display devices, can solve problems such as high cost and complex circuit structure, and achieve the effects of reducing cost, improving circuit efficiency, and reducing complexity

Inactive Publication Date: 2010-07-07
AOTU ELECTRONICS WUHAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, multiple switching controllers and switching regulator

Method used

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  • Circuit for controlling light sources, method and display system
  • Circuit for controlling light sources, method and display system
  • Circuit for controlling light sources, method and display system

Examples

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Embodiment Construction

[0022] A detailed description will be given below of embodiments of the present invention. While the invention will be described in conjunction with examples, it will be understood that it is not intended to limit the invention to these examples. On the contrary, the invention is intended to cover various alternatives, modifications and equivalents as defined within the spirit and scope of the invention as defined by the appended claims.

[0023] Certain portions of the following detailed description are presented in terms of processes, logic blocks, processing procedures, and other symbolic representations of operations on data bits within a computer memory. These descriptions and representations are the means used by those skilled in the data processing arts to most effectively convey the substance of their work to others skilled in the art. In this application, a process, logical block, process, or the like, is conceived as a coherent sequence of steps or instructions to a...

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Abstract

The invention discloses a circuit for controlling light sources, method and display system. The circuit for controlling light sources comprises a converter, a feedback circuit and a current distribution controller. The converter is operable for converting an input voltage to an output current and for providing the output current to the light sources. The feedback circuit is coupled to the light sources for generating feedback signals indicative of currents flowing through the light sources respectively. The current distribution controller is coupled to the feedback circuit for generating control signals based on the feedback signals respectively so as to regulate the currents of the light sources respectively, and for controlling the converter to regulate the output current based on the feedback signals. The circuit for controlling light sources without a plurality of linear regulators or switch controllers and switch regulators reduces the circuit cost, increases the circuit efficiency and reduces the circuit complexity.

Description

technical field [0001] The invention relates to a display device, in particular to a circuit and method for controlling multiple light sources in a liquid crystal display. Background technique [0002] Light-emitting diodes can be used in light-emitting systems, which have the advantages of high efficacy, long life, small volume, and so on. Multiple LEDs can be connected in series, in parallel or series-parallel to provide sufficient brightness. [0003] FIG. 1 shows a conventional LED circuit 100 . LED circuit 100 includes LED strings 102 , 104 and 106 , DC power supply 160 , DC / DC converter 110 , selection circuit 120 and linear regulators 122 , 124 and 126 . Each LED string 102, 104 and 106 includes a plurality of LEDs connected in series. [0004] The DC / DC converter 110 converts the DC voltage VDC from the DC power supply 160 into an output voltage VOUT to drive the LEDs. Due to variances in LED manufacturing, the current flowing through LED strings 102, 104, and 10...

Claims

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Application Information

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IPC IPC(8): H05B37/02G09G3/36G02F1/13357G02F1/1333
CPCH05B33/086H05B45/347
Inventor 柳达
Owner AOTU ELECTRONICS WUHAN
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