Display Device Peak Driving Gamma Curve Smoothing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices face challenges in reducing power consumption and maintaining accurate gamma tuning, as peak driving methods can increase luminance of dark areas, halving power savings and potentially failing to express certain grays when gamma is tuned for high peak luminance or general peak luminance.
Innovation Solution
A display device and method that locally perform peak driving by determining peak driving based on screen load, using a peak driving determination part to analyze input image signals, generating peak and normal driving lookup tables, and applying these tables to specific areas of the display to optimize luminance and gamma curves, thereby preventing excessive luminance increase in dark areas and ensuring gray expression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If peak driving is applied to the entire screen, then power consumption is reduced, but luminance of dark areas increases excessively
Solution Approach 1:
The patent applies different driving modes to different regions of the display screen. Specifically, peak driving is applied only to bright areas while normal driving is applied to dark areas, rather than uniformly across the entire screen. This regional differentiation allows power consumption to be reduced in bright areas without causing excessive luminance increase in dark areas.
Solution Approach 2:
The display screen is segmented into multiple regions based on luminance characteristics - bright areas and dark areas. The patent divides the display area and applies different lookup tables (peak driving lookup table for bright areas, normal driving lookup table for dark areas) to different segments, enabling selective power management without affecting overall display quality.
2Reliability
If gamma is tuned based on high peak luminance, then peak driving performance is improved, but gamma is lowered in normal driving
Solution Approach 1:
The patent dynamically selects between different lookup tables based on the driving mode. The signal controller determines whether to apply peak driving or normal driving to each region and selects the appropriate lookup table accordingly. This dynamic switching allows the system to optimize gamma for the current operating condition - using high peak luminance gamma curve when peak driving is applied, and normal gamma curve when normal driving is applied.
Solution Approach 2:
The patent changes the gamma parameter based on the driving mode. Different lookup tables with different gamma characteristics are used: one optimized for high peak luminance (for peak driving) and another for normal gamma performance (for normal driving). By changing the gamma parameter according to the applied driving mode, the system achieves reliable peak driving performance while maintaining accurate gamma in normal driving conditions.
3Manufacturing precision
If gamma is tuned based on general peak luminance, then normal driving is optimized, but some grays cannot be expressed in peak driving
Solution Approach 1:
The patent creates a multi-functional lookup table system where different lookup tables serve different purposes. The peak driving lookup table is specifically designed to enable gray expression in peak driving mode, while the normal driving lookup table optimizes gamma for normal driving. By having multiple specialized lookup tables, the system achieves both optimized normal driving and capable peak driving performance.
Solution Approach 2:
The patent prepares multiple lookup tables in advance, each optimized for specific driving conditions. The peak driving lookup table is pre-configured to handle gray expression requirements when peak driving is applied. This preliminary preparation ensures that when peak driving mode is activated, the appropriate lookup table is already ready to provide the necessary gray expression capability without compromising normal driving optimization.
4Manufacturing precision
If normal driving is applied to the entire screen, then power consumption increases, but gamma tuning accuracy is maintained
Solution Approach 1:
The patent applies different driving strategies to different regions of the screen based on their luminance characteristics. Dark areas continue to use normal driving with normal lookup tables to maintain gamma accuracy, while bright areas use peak driving with peak lookup tables to reduce power consumption. This local differentiation allows the system to reduce overall power consumption while maintaining gamma tuning accuracy in regions where it matters most.
Solution Approach 2:
Instead of applying peak driving to the entire screen (excessive action that would compromise gamma accuracy), the patent applies peak driving only partially to bright areas where it provides power savings without affecting gamma perception. This partial application of peak driving achieves power consumption reduction while avoiding the negative effects of applying it universally.
Data Source
AI summary
A display device comprises a display area including a plurality of pixels, a peak driving determination part determining peak driving based on an input image signal, a normal driving compensation part including a first luminance lookup table having a first luminance as a peak luminance, a peak driving compensation part including a second luminance lookup table having a second luminance higher than the first luminance as a peak luminance, a compensation adjusting part that generates a peak driving gamma curve by smoothing a first and second luminance gamma curves corresponding to the first and second luminance lookup tables and generates a peak driving lookup table according to the peak driving gamma curve, and a signal controller generating an image data signal by applying one normal driving lookup table to a portion of the display area and applying the peak driving lookup table to an other portion of the display area.