Display Light Source Rate Control for Power and Image Quality
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Solution Overview
Problem
Display devices face challenges in maintaining image quality when power-saving modes reduce light source illumination, leading to decreased luminance and contrast due to the fixed range of luminance levels, which affects the dynamic range and overall image quality.
Innovation Solution
The system adjusts light-valve-modulated pixel luminance levels and applies image tone scale corrections to compensate for reduced light source illumination, using ambient light sensing and image characteristics to enhance image quality while optimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If display illumination is reduced to conserve power, then power consumption is reduced, but image quality and contrast deteriorate
Solution Approach 1:
The patent applies parameter changes by adjusting the luminance modulation level of light-valve-modulated pixels in response to changes in light source illumination intensity. When power-saving mode reduces backlight intensity, the system modifies pixel luminance parameters to compensate, thereby maintaining image quality while consuming less power.
Solution Approach 2:
The system implements feedback control by continuously monitoring light source illumination intensity and adjusting pixel luminance modulation levels accordingly. This closed-loop approach ensures that image quality is maintained despite variations in power consumption and illumination conditions.
2Use of energy by stationary object
If maximum luminance level is reduced, then power consumption is reduced, but dynamic range and image contrast are reduced
Solution Approach 1:
The patent changes the luminance modulation parameter of pixels to compensate for reduced maximum luminance levels. By adjusting pixel-level modulation in response to reduced backlight intensity, the system preserves dynamic range and contrast while operating at lower power consumption levels.
3Use of energy by stationary object
If display operates in power-save mode, then power consumption is reduced, but luminance and contrast are reduced
Solution Approach 1:
The system modifies pixel luminance modulation parameters dynamically based on power-saving mode activation. When power consumption is reduced, the patent adjusts individual pixel modulation levels to compensate for lower backlight intensity, thereby maintaining image quality despite operating in power-save mode.
Solution Approach 2:
The patent employs feedback mechanisms where the system monitors power mode status and illumination levels, then adjusts pixel luminance parameters accordingly. This ensures that image quality is maintained across different power consumption states through continuous adaptation.
Data Source
AI summary
Elements of the present invention relate to systems and methods for modifying or adjusting a display source light illumination level based on power consumption goals. In some embodiments, a rate control parameter may be used to limit the rate at which the illumination level is varied. In some embodiments, image content analysis may be used to determine the value of the rate control parameter.