Display Timing Controller Power Optimization via Grayscale Analysis
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Solution Overview
Problem
Display devices face challenges in reducing power consumption while maintaining image quality, as existing methods often result in reduced grayscale availability, unification, or skipping, leading to image distortion.
Innovation Solution
A display device with a timing controller that calculates an automatic-current-limit rate based on the grayscale usage ratio, adjusting the luminance and on-pixel ratios to minimize power consumption without distorting the image, using a combination of impulsive dimming and image converting methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If input data is converted or reduced based on on-pixel ratio to reduce power consumption, then power consumption is reduced, but grayscale availability is reduced and image distortion occurs
Solution Approach 1:
The patent changes the parameter of luminance while maintaining grayscale structure. By calculating automatic-current-limit rate based on grayscale usage ratio and adjusting output luminance accordingly, the system reduces power consumption without distorting the image, as luminance adjustment does not affect grayscale distribution
Solution Approach 2:
The patent dynamically adjusts the automatic-current-limit rate based on real-time grayscale usage ratio calculations. The system monitors the distribution of grayscale levels in input data and adapts the current limit rate accordingly, allowing optimal power saving while preserving image quality for different content types
2Use of energy by moving object
If grayscale levels are unified or skipped to reduce power consumption, then power consumption is reduced, but image distortion occurs
Solution Approach 1:
The patent changes only the luminance parameter while preserving all grayscale levels. By adjusting output luminance based on automatic-current-limit rate without skipping or unifying grayscale levels, the system achieves power reduction while maintaining complete grayscale information and avoiding image distortion
3Use of energy by moving object
If on-pixel ratio is reduced to save power, then power consumption is reduced, but luminance and image quality are affected
Solution Approach 1:
The patent explicitly changes the luminance parameter through automatic-current-limit rate adjustment. By reducing output luminance based on grayscale usage ratio while preserving grayscale distribution, the system achieves power consumption reduction without affecting perceived image quality, as the human visual system is less sensitive to luminance changes than grayscale changes
Data Source
AI summary
A display device includes a display panel including pixels; and a timing controller to calculate a grayscale usage ratio of input data and to determine an automatic-current-limit rate based on the grayscale usage ratio, the automatic-current-limit rate representing a power saving rate.