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

Backside light control device

A backlight control and backlight device technology, which is applied in lighting devices, display devices, energy-saving control technology, etc., can solve the problems that the brightness of the backlight cannot be adjusted, the background brightness cannot be correctly sensed, and the photosensitive characteristics of the cadmium sulfide photoresistor are unstable.

Inactive Publication Date: 2003-12-03
MITAC INT CORP
View PDF0 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cadmium sulfide photoresistor has unstable photosensitive characteristics at high brightness, and cannot correctly sense the background brightness, so the backlight cannot be adjusted to an appropriate brightness.

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
  • Backside light control device
  • Backside light control device
  • Backside light control device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0015] The backlight control device of the present invention mainly uses a phototransistor as a brightness sensing component to sense the background brightness of the liquid crystal display, and then generates a pulse wave modulation signal to control the brightness of the backlight according to the brightness sensing result. Therefore, this device can continuously adjust the backlight brightness of the liquid crystal display according to the background brightness state, so that there is coordination between the two, that is, when the background brightness increases, the backlight brightness can be reduced dynamically; when the background brightness decreases, The brightness of the backlight can also be increased dynamically to reduce its power consumption. The details of a preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

[0016] figure 1 It is a functional block diagram showing the automatic brightness contro...

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 back light controller for the LCD with back light unit is composed of a photosensitive transistor for sensing the brightness of back light, a control circuit including a control voltage generator for generating a control signal to regulate the brightness of back light, a pulse wave regulator for regulating the clock pulse signals according to said control signal, and a back light driver for driving the back light unit according to regulated clock pulses for regulating the brightness of back light.

Description

(1) Technical field [0001] The invention relates to a backlight control device, in particular to a backlight control device which uses a photosensitive transistor to sense background brightness. (2) Background technology [0002] Generally, display devices that require a backlight, such as LCDs, are mostly used in portable electronic devices, such as notebook computers (notebooks), electronic dictionaries (electronic dictionary) and personal digital assistants (personal digital agent, PDA). When operating a display device that requires a backlight, the external light source often directly affects the user's visual comfort. Therefore, the portable electronic device must provide an appropriate dimming mechanism so that the intensity of the backlight can be adjusted at any time. [0003] There are mainly two known backlight dimming mechanisms, one is manual, and the other is a cadmium sulfide photoresistor used as a component of the backlight control device. [0004] Manual u...

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 Applications(China)
IPC IPC(8): G09F13/00H05B37/02
CPCY02B20/42Y02B20/40
Inventor 许世法
Owner MITAC INT CORP