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Methods and apparatus of dynamic backlight control

A dynamic backlight control, backlight technology, applied in static indicators, cathode ray tube indicators, image data processing, etc., can solve the problems of shortened battery life, short operation time, low energy efficiency, etc.

Active Publication Date: 2011-11-09
SOLOMON SYSTECH CHINA LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The energy inefficiency caused by the LCD backlight can cause a series of power problems, including running for a shorter time than the battery capacity can provide, frequent charging and discharging of the battery and shortening the battery life, which may affect the display in the portable device, Cell phones, for example, are especially a problem

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  • Methods and apparatus of dynamic backlight control
  • Methods and apparatus of dynamic backlight control
  • Methods and apparatus of dynamic backlight control

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Embodiment Construction

[0036] The present invention discloses improved methods and apparatus for dynamic backlighting. In the following description, numerous specific details are set forth, including circuit elements, parameters, pixel intensities, and the like. However, modifications, including additions and / or reductions, that do not violate the scope and spirit of the present invention will be apparent to those skilled in the art based on the description. In other instances, specific details are omitted in order not to obscure the invention. However, this description enables one of ordinary skill in the art to practice embodiments of the invention without experimentation.

[0037] figure 1 is a simple tone mapping model according to one embodiment of the present invention. figure 1 shows, input pixel value 101, PV IN How to use piecewise linear curve 103 to map to output pixel value 102, PV OUT of. The illustration also shows the clipping point 104,Xc, at which point the corresponding outpu...

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PUM

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Abstract

A method of adjusting image intensity to compensate backlight dimming in dynamic backlight control, the method including estimating distortion of an image that corresponds to different mapping index values 204 selected from the intensity levels 202 of an image. The estimated distortion of image represents factors including the quantity of pixels 205 that have intensity exceeding a mapping index value 204; and the amount 206 that the intensity of each pixel exceeds the corresponding mapping index value. The method further includes selecting from a plurality of schemes 301 for adjusting image intensity to minimize the estimated distortion obtained from the estimating.

Description

technical field [0001] The present invention generally relates to methods and devices for saving power consumption in display systems; in particular, to methods and devices for dynamically controlling the backlight of a display system according to displayed images to save power consumption. Background technique [0002] Liquid crystal display (LCD) screens are usually backlit for easy viewing. Existing backlit liquid crystal displays (LCDs) typically include a core of LCD material sandwiched between sheets of glass. The backlight element used to emit light to illuminate the LCD material is placed behind the glass. LCD backlighting is very inefficient from a power consumption standpoint. For example, when the backlight element is set to illuminate the LCD material at a brightness, depending on the value of the image to be displayed by the pixel, the LCD material may be in a twisted configuration such that a substantial portion of the light passing through the LCD material i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/20G09G3/36
CPCG09G2320/0646G09G3/3406G09G2360/16G09G2330/021G09G5/10G09G3/36G06T5/00
Inventor 蔡伟柏陈永志黎惠恩
Owner SOLOMON SYSTECH CHINA LTD