Invention Grant
- Patent Title: Aging based white point control in backlights
- Patent Title (中): 背光老化的白点控制
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Application No.: US12410204Application Date: 2009-03-24
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Publication No.: US08390562B2Publication Date: 2013-03-05
- Inventor: Cheng Chen , Jun Qi , John Z. Zhong , Victor H. Yin , Wei Chen
- Applicant: Cheng Chen , Jun Qi , John Z. Zhong , Victor H. Yin , Wei Chen
- Applicant Address: US CA Cupertino
- Assignee: Apple Inc.
- Current Assignee: Apple Inc.
- Current Assignee Address: US CA Cupertino
- Agency: Fletcher Yoder PC
- Main IPC: G09G3/36
- IPC: G09G3/36

Abstract:
Systems, methods, and devices are provided for maintaining a target white point on a light emitting diode based backlight. In one embodiment, the backlight may include two or more strings of light emitting diodes, each driven at a respective driving strength. Each string may include light emitting diodes from a different color bin, and the respective driving strengths may be adjusted, for example, through pulse width modulation or amplitude modulation, to maintain the target white point. In certain embodiments, the driving strengths may be adjusted to compensate for shifts in the white point that may occur due to temperature or aging. A controller may adjust the driving strengths based on feedback from a temperature sensor, from an optical sensor, from a user input, or from calibration data included within the backlight or system.
Public/Granted literature
- US20100245228A1 AGING BASED WHITE POINT CONTROL IN BACKLIGHTS Public/Granted day:2010-09-30
Information query
IPC分类: