Display Gamma Adjustment for Red Color Brightness at Large Viewing Angles
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Solution Overview
Problem
Liquid-crystal display (LCD) panels face challenges in maintaining color accuracy and brightness across large viewing angles due to color casts from red, green, and blue hues, which affect the overall color performance.
Innovation Solution
The method involves calculating average signals of sub-pixel units in zones to adjust green and blue gamma values based on predefined grayscale ranges, thereby adjusting the luminance of corresponding light sources to compensate for color casts and maintain the original color hue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If green and blue light source luminances are increased to compensate for color casts at large viewing angles, then color brightness is improved, but color accuracy deteriorates
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting gamma values for green and blue color channels based on viewing angle and grayscale ranges. Instead of fixed luminance compensation, the system modifies the gamma parameter (exponent in luminance calculation) to achieve both brightness enhancement and color accuracy preservation. The gamma adjustment is performed separately for different grayscale ranges (0-63, 64-127, 128-191, 192-255) to optimize color performance across the entire display range.
Solution Approach 2:
The patent implements local quality by applying different gamma adjustment strategies to different grayscale ranges and color channels. Each color channel (red, green, blue) receives customized gamma correction, and within each channel, different grayscale ranges receive different adjustment magnitudes. This localized approach ensures that color compensation is applied precisely where needed without affecting other regions, thereby maintaining overall color accuracy while improving brightness at large viewing angles.
2Manufacturing precision
If gamma adjustment is applied to compensate for color casts, then color performance is improved, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-defining gamma adjustment tables for different grayscale ranges and color channels. Instead of calculating complex compensation values in real-time, the system uses pre-computed lookup tables that map grayscale values to adjusted gamma parameters. This approach simplifies the control logic while maintaining color performance, as the driver IC can directly reference these pre-calculated values without performing complex computations during operation.
Solution Approach 2:
The patent implements dynamics by making gamma values adjustable and adaptive rather than fixed. The system dynamically selects appropriate gamma adjustment parameters based on the current grayscale range and color channel being driven. This dynamic adaptation allows the display to optimize color performance for different content types and viewing conditions without requiring complex real-time analysis, thereby balancing performance improvement with control simplicity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach improves color brightness and accuracy of the red hue at large viewing angles while maintaining the original color performance by adjusting green and blue gamma signals, reducing color casts and ensuring consistent color representation.
Implementation Method 1
two polarization filters, with polarization directions perpendicular to each other, disposed on two outer sides. If there is no liquid crystal between the electrodes, when light passes through one of the polarization filters, a polarization direction of the light is completely perpendicular to the second polarization filter, and therefore the light is completely blocked. However, if the polarization direction of the light passing through one of the polarization filters is rotated by liquid crystals, the light can pass through the other polarization filter.
Implementation Method 2
Rotation of the polarization direction of the light by the liquid crystals may be controlled by means of an electrostatic field, so as to implement control on the light.
Data Source
AI summary
This application relates to a method and an apparatus for driving a display apparatus and a display apparatus. The method for driving a display apparatus includes: calculating average signals of sub pixel units in a zone to obtain a zone red average signal, a zone green average signal, and a zone blue average signal; separately performing a green adjustment and a blue gamma adjustment according to grayscale corresponding predefined ranges of the red, green, and blue average signals; and adjusting luminances of corresponding green light source and blue light sources. Color brightness of red in a large viewing angle can be improved while performance of an original color signal can be maintained.