Gamma Adjustment for Display Panels with Non-Zero Minimum Brightness
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Solution Overview
Problem
Existing gamma adjustment methods for display panels compress brightness differences at low gray levels, leading to poor image display quality when the minimum brightness is not zero.
Innovation Solution
A gamma adjustment method that measures minimum and maximum brightness values and calculates intermediate parameters to adjust brightness values at each gray level, ensuring accurate representation of image information at low gray levels by using the formulae Lz=(x+z×yn)m×Lmax or Lz=(x+z×yx)m×Lmin, where z ranges from 1 to (n−1), and adjusting the display panel based on these calculated values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If gamma adjustment is performed using an ideal gamma curve, then the display panel can accurately display image information at high gray levels, but brightness differences among low gray levels are compressed when the minimum brightness is not zero
Solution Approach 1:
The patent applies local quality by using different gamma adjustment strategies for different gray level ranges. For low gray levels (0 to threshold), a linear adjustment formula is used to preserve brightness differences, while for high gray levels (threshold to maximum), the ideal gamma curve is applied to maintain accuracy. This localized approach allows each gray level range to be optimized independently according to its specific requirements.
Solution Approach 2:
The patent changes the adjustment parameter from a fixed ideal gamma curve to a dynamic formula that adapts based on the minimum brightness value Lmin. When Lmin is not zero, the linear interpolation formula Lz = Lmin + (z/n) × (Lmax - Lmin) is used, which dynamically adjusts the brightness values to maintain appropriate differences at low gray levels while still achieving accurate display at high gray levels.
2Adaptability or versatility
If the minimum brightness value Lmin is not zero, then the display panel has better adaptability to different display environments, but direct gamma adjustment using ideal gamma curve results in compression of brightness difference among low gray levels
Solution Approach 1:
The patent introduces dynamics by making the gamma adjustment process adaptive to the actual minimum brightness value Lmin of the display panel. Rather than using a static ideal gamma curve, the system dynamically determines the adjustment formula based on Lmin, allowing the display panel to maintain both environmental adaptability and proper brightness differentiation at low gray levels.
Data Source
AI summary
The present invention relates to a gamma adjustment method, which includes: measuring a minimum brightness value Lmin and a maximum brightness value Lmax of a display panel; wherein the minimum brightness value Lmin is a brightness value at gray level 0, and the maximum brightness value Lmax is a brightness value at gray level n; calculating value of a first intermediate parameter x according to formulaLminLmax=(xn)m,where m is a gamma value of the display panel; calculating value of a second intermediate parameter y according to formulay=n-xn;calculating a brightness value Lz at gray level z according to formulaLz=(x+z×yn)m×LmaxorLz=(x+z×yx)m×Lmin,where z is an integer ranging from 1 to (n−1); and adjusting the brightnesses of the display panel based on the minimum brightness value Lmin, the maximum brightness value Lmax, and the brightness values at gray level 1 to gray level (n−1).