Multi-view Display Gamma Calibration via Voltage Adjustment
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Solution Overview
Problem
Multi-view displays using MVA LCD panels face color shift issues when displaying images at different view angles, which existing solutions attempt to address by dividing pixel areas into sub-pixel areas with different luminance levels, resulting in reduced light transmittance and increased costs.
Innovation Solution
The use of look-up tables and gamma voltage generators to calibrate gamma curves for each pixel group, allowing for the display of multiple images with correct gray levels at different view angles without significant color shift, while maintaining acceptable light transmittance and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If circuitry is used to divide pixel area into sub-pixel areas with different luminance levels to address color shift, then color shift is reduced, but light transmittance is reduced and light utilization efficiency decreases
Solution Approach 1:
The patent changes the electrical parameters (voltage levels) applied to different pixel groups to compensate for color shift. By adjusting the voltage applied to pixels in different view angle groups, the gamma curves are calibrated to produce consistent color output across multiple views without modifying the physical pixel structure or adding optical barriers.
2Manufacturing precision
If circuitry is used to divide pixel area into sub-pixel areas with different luminance levels to address color shift, then color shift is reduced, but costs increase
Solution Approach 1:
The patent uses a single data driver circuit to perform multiple functions: driving pixels for different view angles and calibrating gamma curves for each pixel group. This multi-functional approach eliminates the need for separate circuitry for each pixel group, reducing overall device complexity while maintaining color accuracy across multiple views.
3Adaptability or versatility
If MVA LCD panel is used to provide wide view angles for multi-view display, then view angle is improved, but color shift occurs due to different gamma curves for different pixel groups
Solution Approach 1:
The patent implements a feedback mechanism where the data driver measures or determines the actual gamma curve characteristics of each pixel group and adjusts the voltage levels accordingly. This closed-loop calibration ensures that despite the inherent differences in gamma curves caused by the MVA panel structure, the displayed color remains consistent across all view angles.
Data Source
AI summary
According to various embodiments of the invention, gamma curves for multiple pixel groups can be calibrated using look-up tables or by using reference voltage groups provided by gamma voltage generators so that the pixels can display multiple images with correct gray levels at different view angles. Therefore, color shift can be avoided or lessened without necessarily using extra circuitry on the display panel. Also, any related light transmittance or light utilization efficiency reduction may be decreased or eliminated.