LIQUID CRYSTAL DISPLAY

• US 20080150855A1
• Filed: 07/16/2007
• Published: 06/26/2008
• Est. Priority Date: 12/26/2006
• Status: Abandoned Application

• Current Assignee: Hong Fu Jin Precision Industry (Shenzhen) Co., Ltd. (Hon Hai Precision Industry Co., Ltd.), Hon Hai Precision Industry Co., Ltd.
• Original Assignee: Hong Fu Jin Precision Industry (Shenzhen) Co., Ltd. (Hon Hai Precision Industry Co., Ltd.), Hon Hai Precision Industry Co., Ltd.
• Inventors: CHEN, XIAO-ZHU, CHEN, MING-KE
• Application Number:
  US11/778,086
• Publication Number:
  US 20080150855A1
• Time in Patent Office: Days
• US Class Current: 345/87
• CPC Class Codes: G06F 1/3218 of display devices
• CPC Class Codes: G06F 1/3265 Power saving in display device
• CPC Class Codes: G09G 2330/022 in absence of operation, e.g. no data being entered during a predetermined time
• CPC Class Codes: G09G 3/3406 Control of illumination source illumination devices structurally associated with liquid crystal cells G02F1/1336
• CPC Class Codes: Y02D 10/00 Energy efficient computing, e.g. low power processors, power management or thermal management

Abstract

A liquid crystal display includes a sensing device configured for sensing the presence or absence of a user and generating an indicating signal indicative of the presence or absence of the user, a controller configured to receive the indicating signal from the sensing device and produce a control signal in response to the indicating signal, and a switch being connected between a back-light power source and a back-light module, the switch being switched on or off in response to the control signal.

Claims

1. A liquid crystal display, comprising:

a sensing device configured for sensing the presence or absence of a user, and generating an indicating signal indicative of the presence or absence of the user;

a controller configured to receive the indicating signal from the sensing device and produce a control signal in response to the indicating signal; and

a switch being connected between a back-light power source and a back-light module, the switch being switched on or off in response to the control signal.

2. The liquid crystal display as described in claim 1, wherein the switch comprises a control terminal, an input terminal, and an output terminal, the control terminal of the switch is connected to a signal output terminal of the controller for receiving the control signal, the input terminal of the switch is connected to the back-light power source, and the output terminal of the switch is connected to the back-light module.

3. The liquid crystal display as described in claim 2, wherein the switch is a switching transistor.

4. The liquid crystal display as described in claim 1, wherein the sensing device is an infrared detector.

5. The liquid crystal display as described in claim 1, wherein the sensing device is an

ultrasonic detector.

6. The liquid crystal display as described in claim 1, wherein the sensing device is mounted to a lower portion of the liquid crystal display and is powered by a system power source configured to provide power to the liquid crystal display, when the liquid crystal display is powered on, the controller switches on the switch.

7. A method for saving power for a liquid crystal display, the method comprising:

a sensing device sensing the absence of a user within a sensing range;

the sensing device generating an indicating signal indicative of the absence of the user; and

a controller interrupting a back-light power to a back-light module of the liquid crystal display in response to the indicating signal.

8. The method as described in claim 7, wherein the sensing is done with an infrared signal.

9. The method as described in claim 7, wherein the sensing is done with an ultrasonic signal.