Backlight module and light modulation method thereof

A technology of a backlight module and a light-emitting unit, which is applied to optics, light sources, electric light sources, etc., can solve the problems of small dimming range, reduced circuit efficiency, and difficult design of electromagnetic interference filters, and achieve the effect of increasing the dimming range.

Inactive Publication Date: 2012-07-18
INNOLUX CORP
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the amplitude dimming method is accompanied by limitations such as the difficulty in designing the electromagnetic interference filter at the power supply end of the backlight module 1, the reduction of circuit efficiency due to the lack of zero-voltage switching of the switching unit, and the limitation of the dimming range due to the input voltage of 24 volts. , it can be seen that the biggest influence is that the dimming range is not large

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
  • Backlight module and light modulation method thereof
  • Backlight module and light modulation method thereof
  • Backlight module and light modulation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0018] A backlight module and a dimming method thereof according to preferred embodiments of the present invention will be described below with reference to related drawings.

[0019] Such as Figure 2A As shown, a backlight module 2 according to the first preferred embodiment of the present invention includes a switching unit 21 , a resonant conversion unit 22 , a transformer 23 and a light emitting unit 24 . In addition, the backlight module 2 of this embodiment further includes a control unit 25 .

[0020] In this embodiment, the switching unit 21 includes a bridge switching circuit, which generates a switching signal S12 according to the first control signals S11, S11'. The bridge switching circuit of this embodiment can be a full bridge switching circuit (such as Figure 2A shown) or a half-bridge switching circuit (such as Figure 2B As shown), here a full-bridge switching circuit is taken as an example, and thus the first control signals S11, S11' are converted into ...

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

A backlight module includes a switching unit, a resonance converting unit, a transformer and a lightening unit. The switching unit generates a switching signal according to a first control signal; the resonance converting unit is electrically connected with the switching unit for receiving the switching signal, and is provided with a first energy storing component and a switch component for controlling the switch component according to a second control signal and enabling the resonance converting unit to generate a resonance converting signal; the transformer is provided with a primary side winding and a secondary side winding, wherein the primary side winding is electrically connected with the resonance converting unit and the switching unit, and the transformer generates a driving signal according to the resonance converting signal and the switching signal; and the lightening unit is electrically connected with the secondary side winding and driven according to the driving signal.

Description

technical field [0001] The invention relates to a backlight module and a dimming method thereof, in particular to a backlight module and a dimming method thereof combining amplitude and burst mode dimming functions. Background technique [0002] With the advent of the digital age, the technology of liquid crystal display devices has grown rapidly and has become an indispensable electronic product. Therefore, the requirements for the technology and functions of liquid crystal display devices are also getting higher and higher. [0003] Generally speaking, a liquid crystal display device mainly includes a liquid crystal display panel and a backlight module. Among them, the liquid crystal display panel mainly has two substrates and a liquid crystal layer sandwiched between the two substrates; and the backlight module emits uniform light to distribute on the surface of the liquid crystal display panel. Traditionally, a cold cathode fluorescent lamp (CCFL) is used as the backligh...

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 & AuthorityPatents(China)
IPC IPC(8): G02F1/13357G09G3/34G09G3/36H05B41/36H05B41/38
Inventor赖建丞王文哲陈世明
OwnerINNOLUX CORP