LCD Gamma Correction for Color Frame Accuracy
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Solution Overview
Problem
Conventional displays, such as LCDs, exhibit poor image quality when displaying pure color frames due to significant offsets between gamma curves of pure color frames and the standard gamma curve 2.2, leading to issues like poor color and contour effects.
Innovation Solution
A gamma correction method for LCD panels that involves setting gamma voltages based on reference gamma curves for primary-color frames, with the option to linearly combine obtained gamma curves for each color frame to improve image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If gamma voltages are adjusted based on the standard gamma curve 2.2 using white frames, then the displays show the expected gray levels, but the displayed gray levels for pure color frames are much poorer
Solution Approach 1:
The patent applies different gamma correction parameters specifically for color frames rather than using a universal gamma curve. By identifying that color frames have different luminance characteristics compared to white frames, the invention creates dedicated gamma correction tables for color content, thereby improving color frame display quality without affecting white frame performance
Solution Approach 2:
The patent changes the gamma correction parameters based on the type of content being displayed. It detects whether the current frame is a color frame and applies corresponding gamma correction parameters from different lookup tables, thereby adapting the display characteristics to match the content requirements
2Manufacturing precision
If the displays are adjusted to satisfy the standard gamma curve 2.2, then gray levels are correct for white frames, but there are significant offsets for pure color frames leading to poor color and contour effects
Solution Approach 1:
The patent segments the gamma correction process into different pathways for white frames and color frames. It creates separate gamma correction lookup tables optimized for each frame type, allowing independent optimization of gamma characteristics for different content categories, thereby eliminating the harmful offsets that affect color frames
Solution Approach 2:
The patent implements a feedback mechanism that detects the frame type (white or color) and dynamically selects the appropriate gamma correction parameters. This closed-loop approach ensures that the correct gamma curve is applied based on the actual content being displayed, preventing color distortion and contour effects
Data Source
AI summary
A gamma correction method adapted for a liquid crystal display panel is provided. The gamma correction method includes the following steps. A reference gamma curve is provided. The LCD panel is lighted up with at least one of primary-color frames. Gamma voltages of the primary-color frame are set for the LCD panel based on the reference gamma curve to obtain at least one primary-color gamma curve. The gamma correction is performed on the LCD panel based on the at least one primary-color gamma curve or a linear combination curve of the at least one primary-color gamma curve. By using the gamma correction method, the LCD panel could be allowed to provide good image quality.