Stereo Display Overdrive LUTs for Luminance Accuracy
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Solution Overview
Problem
Current 3D display technologies face performance issues due to slow response times of liquid crystal displays (LCDs) and polarization switches, leading to inadequate luminance levels and optical leakage, which affect the stereo effect in time-sequential stereoscopic displays.
Innovation Solution
The implementation of left and right overdrive look-up tables (OD LUTs) and gamma look-up tables (LUTs) optimized for each eye, allowing for independent optimization of overdrive and gamma correction for left and right images, ensuring accurate and efficient luminance levels in stereo displays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single overdrive look-up table is used for both left and right images, then device complexity is reduced, but luminance accuracy deteriorates due to inability to optimize per-eye independently
Solution Approach 1:
The patent divides the single overdrive correction system into separate left-eye and right-eye overdrive look-up tables. This segmentation allows independent optimization of overdrive parameters for each eye, improving luminance accuracy without requiring a complete redesign of the display system.
Solution Approach 2:
The patent applies different overdrive characteristics to different regions (left eye vs. right eye) based on their specific performance requirements. Each eye receives customized overdrive correction tailored to its optical path and performance characteristics, rather than applying a uniform correction across the entire display.
2Illumination intensity
If response time of LCD and polarization switch is increased to improve stereo effect, then luminance level is improved, but frame rate deteriorates
Solution Approach 1:
The patent applies overdrive correction in advance to pre-compensate for the slow response characteristics of the LCD and polarization switch. By adjusting the voltage waveform before the actual display update, the system anticipates and compensates for the delayed response, achieving adequate luminance levels without sacrificing frame rate.
3Productivity
If polarization switch response time is reduced to improve frame rate, then productivity is improved, but optical leakage increases deteriorating stereo effect
Solution Approach 1:
The overdrive correction pre-adjusts the voltage applied to the polarization switch, ensuring that it reaches the desired state faster and more accurately. This preliminary voltage adjustment compensates for the switch's inherent slow response, reducing optical leakage during transitions while maintaining high frame rates.
4Measurement precision
If gamma correction is optimized for both eyes using separate tables, then luminance accuracy is improved, but processing complexity increases
Solution Approach 1:
The patent segments the gamma correction process into separate left-eye and right-eye gamma look-up tables. This allows independent optimization of gamma characteristics for each eye's optical path, improving luminance accuracy while keeping the processing architecture manageable through modular organization.
Data Source
AI summary
System and method for video processing. First video levels for pixels for a left image of a stereo image pair are received from a GPU. Gamma corrected video levels (g-levels) are generated via a gamma look-up table (LUT) based on the first video levels. Outputs of the gamma LUT are constrained by minimum and/or maximum values, thereby excluding values for which corresponding post-OD display luminance values differ from static display luminance values by more than a specified error. Overdriven video levels are generated via a left OD LUT based on the g-levels. The overdriven video levels correspond to display luminance values that differ from corresponding static display luminance values by less than the error threshold, and are provided to a display device for display of the left image. This process is repeated for second video levels for a right image of the stereo image pair, using a right OD LUT.