Unlock instant, AI-driven research and patent intelligence for your innovation.

Circuit structure for LCD backlight

A circuit structure and circuit technology, applied in the direction of lamp circuit layout, light source, electric light source, etc., can solve the problems that cannot overcome the shortcomings of circuit protection

Inactive Publication Date: 2009-06-24
O2 MICRO INT LTD
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Although the circuits in Figures 2A and 2B can provide a solution to lamp current balancing, they cannot overcome the disadvantages associated with circuit protection

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Circuit structure for LCD backlight
  • Circuit structure for LCD backlight
  • Circuit structure for LCD backlight

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0024] Reference will now be made in detail to embodiments of the present invention. While the invention is described in conjunction with embodiments, it should be understood that the invention is not limited to these embodiments. On the contrary, the invention is intended to cover alternatives, modifications and equivalents, which may be included within the spirit and scope of the invention as defined by the appended claims.

[0025] image 3 A schematic diagram of a circuit 300 according to an embodiment of the invention is shown. Circuit 300 is used to drive CCFLs 342 , 344 , 346 and 348 . In addition to the DC power supply 110, the inverter circuit 120, the transformer 130A and the controller 160, the circuit 300 further includes a current balancing circuit composed of a balancing choke 350, wherein the balancing choke is usually a common mode choke. High voltage sides HV1 and HV2 of CCFLs 342 and 344 are connected to high voltage side HVA of transformer 130A through bal...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a circuit structure for LCD backlight. The circuit structure includes an inverter topology, a current balancing circuit and multiple loads. The current balancing circuit is connected to a plurality of loads and can balance currents of N loads by using N / 2-1 balancing choke coils. The current structure further includes a protection circuit connected to the low voltage side of the plurality of loads. The protection circuit can sense the lamp voltage and provide a feedback signal to the controller. In addition, the protection circuit consists of a reduced number and cost competitive electronic components.

Description

technical field [0001] The present invention relates to a backlight circuit, and more particularly to a liquid crystal display (LCD) backlight circuit having a plurality of lamps. Background technique [0002] LCD panels are used in a variety of applications ranging from portable electronic devices to fixed positioning units such as video cameras, automatic positioning systems, laptop PCs, and industrial machines. The LCD panel itself cannot emit light but is illuminated from the back by a light source. The most commonly used backlights are cold cathode fluorescent lamps (CCFL). Typically, a high alternating current (AC) electrical signal is required to light and operate a CCFL. To generate such a high AC signal from a direct current (DC) source such as a rechargeable battery, a DC / AC inverter is designed. [0003] However, in recent years there has been interest in large size LCD displays, as required in LCD televisions and computer monitors, which require multiple CCFLs...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/133G09G3/34H05B37/02H05B37/00
Inventor 王小军李胜泰李友玲柳达郭茹
Owner O2 MICRO INT LTD