LCD Light Intensity Correction via Unified Interpolation
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Solution Overview
Problem
Liquid crystal displays (LCDs) face issues with uneven light intensity distribution due to uneven liquid crystal alignment and irregular film thickness, which existing correction methods, such as gamma, weight shading, and modulation shading corrections, are insufficient to fully address.
Innovation Solution
An LCD system that includes a division point memory for positional information of pixel division points, a gradation correction value memory for pre-determined values, a gradation level determination unit, a horizontal interpolation unit, and a vertical interpolation unit to generate corrected image signals by considering alignment unevenness and film thickness irregularities, effectively correcting nonlinear light intensity distributions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If gamma correction, weight shading correction, and modulation shading correction are used to correct uneven light intensity distribution, then some correction is achieved, but the correction is insufficient due to the complexity and limitations of these separate correction units
Solution Approach 1:
The patent combines gamma correction, weight shading correction, and modulation shading correction into a single integrated correction unit. This unit stores correction data for multiple pixel division points and performs all three correction types through unified interpolation calculations, eliminating the need for separate correction units while achieving comprehensive light intensity uniformity correction.
Solution Approach 2:
The correction unit is designed to perform multiple correction functions simultaneously. It stores correction data for different pixel division points and can apply gamma correction, weight shading correction, and modulation shading correction through a single set of interpolation operations, making the device multi-functional and reducing overall system complexity.
2Measurement precision
If more correction units are added to improve light intensity uniformity, then correction accuracy improves, but device complexity and processing time increase
Solution Approach 1:
The correction data for multiple pixel division points is stored in advance in the correction unit. During operation, the unit retrieves pre-calculated correction data and performs interpolation calculations, avoiding the need for real-time complex measurements and calculations, thus achieving high correction accuracy without excessive processing time.
3Manufacturing precision
If separate correction units are used for gamma, weight shading, and modulation shading corrections, then each correction can be optimized independently, but the overall system becomes complex and difficult to control
Solution Approach 1:
The patent merges three separate correction functions into one integrated correction unit that handles gamma correction, weight shading correction, and modulation shading correction simultaneously. This unified approach simplifies system control while maintaining the effectiveness of all three correction types through coordinated interpolation operations.
Data Source
AI summary
In a liquid crystal display (LCD), a division point memory stores positional information about pixel division points that regularly divide X pixels and Y pixels on a display screen into sections. A gradation correction value memory stores gradation correction values that are prepared for the pixel division points and gradation division points, respectively, the gradation division points regularly dividing a maximum gradation level characteristic to the LCD into sections. A gradation level determination unit generates gradation level interpolation signals for pixel division points related to an input image signal according to the gradation correction values stored in the gradation correction value memory. A horizontal interpolation unit finds x-axis distances between a pixel position of the input image signal and positions of the pixel division points, and according to the found x-axis distances and the gradation level interpolation signals, generates horizontal interpolation signals. A vertical interpolation unit finds y-axis distances between the pixel position of the input image signal and the positions of the pixel division points, and according to the found y-axis distances and the horizontal interpolation signals, generates an image signal to be displayed on the LCD.