RGBW Display Color Correction via Dynamic Backlight Control
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Solution Overview
Problem
RGBW displays face challenges in color correction, particularly with dynamic backlight control and subpixel rendering, leading to image degradation and high power consumption, due to invalid corrections and non-optimal scaling parameters.
Innovation Solution
The implementation of a color correction technique that adjusts white chrominance and RGB luminance using ACC tables and interpolation methods, incorporating dynamic backlight control and subpixel rendering, to maintain image quality and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional color correction is applied to RGBW displays with dynamic backlight control, then color accuracy may be maintained, but image degradation occurs and power consumption increases
Solution Approach 1:
The patent implements dynamic color correction by adjusting the ACC tables based on the current backlight intensity level. The system determines the operating point of the display based on actual backlight conditions and selects or interpolates appropriate correction parameters, making the color correction adaptive rather than static. This resolves the contradiction by maintaining color accuracy across varying backlight conditions without causing image degradation.
Solution Approach 2:
The patent changes the correction parameters in the ACC tables based on the measured or estimated backlight intensity. By adjusting the gamma values and chrominance correction factors according to the operating point, the system maintains accurate color representation while avoiding the image degradation that would result from using fixed, non-optimal correction parameters.
2Measurement precision
If conventional color correction is applied to RGBW displays with dynamic backlight control, then color accuracy may be maintained, but power consumption increases
Solution Approach 1:
The patent optimizes power consumption by adjusting the correction parameters in the ACC tables based on the actual backlight intensity level. By using operating-point-dependent correction values, the system achieves accurate color representation while minimizing the energy required for color transformation calculations, thereby resolving the contradiction between color accuracy and power consumption.
3Device complexity
If fixed ACC tables are used for color correction, then device complexity is reduced, but color accuracy degrades under dynamic backlight conditions
Solution Approach 1:
The patent implements a dynamic correction system where the ACC tables are adjusted based on the current backlight operating point. The system determines the appropriate correction parameters based on measured or estimated backlight intensity and applies the corresponding correction values. This dynamic approach maintains high color accuracy across varying conditions while keeping the implementation complexity manageable through the use of pre-calculated correction tables.
Solution Approach 2:
The patent performs preliminary calculation and storage of correction parameters for different operating points in the ACC tables. By pre-computing and storing the correction values for various backlight intensity levels, the system avoids complex real-time calculations while maintaining the ability to adapt to dynamic conditions, thus resolving the contradiction between complexity and accuracy.
4Ease of operation
If simple correction methods are used, then ease of operation is improved, but image quality degradation increases
Solution Approach 1:
The patent implements a practical dynamic correction system that balances simplicity and image quality. The system uses pre-calculated ACC tables that are selected or interpolated based on the current operating point, providing adaptive correction without requiring complex real-time computation. This approach maintains ease of operation while significantly improving image quality compared to fixed correction methods.
Data Source
AI summary
Displays are provided with circuitry performing color correction to compensate for the displays' luminance and chrominance transfer characteristics. Some techniques are suitable for RGBW displays and for subpixel-rendered displays. Some displays include an external light source (e.g. a backlight unit in LCDs), and the color correction is coordinated with dynamic control of the light source.