Display Panel Gamma Lookup Table Viewing Angle Correction
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Solution Overview
Problem
Liquid crystal display (LCD) panels face limitations in viewing angle, particularly as grayscale values decrease, leading to discoloration and increased manufacturing costs due to the need for separate circuits and backlight units in existing methods.
Innovation Solution
A display apparatus that enhances viewing angle by storing lookup tables corresponding to various gamma values and applying them based on the location of RGB sub-pixels, without dividing pixels or changing the display panel structure, using a processor to generate and control these tables for accurate color representation across different grayscale levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a related-art method that divides a sub pixel into low grayscale and high grayscale representation areas is used, then viewing angle is improved, but manufacturing cost increases due to separate circuits, backlight units, and doubled ICs
Solution Approach 1:
The patent changes the gamma parameter dynamically based on grayscale values and pixel location. By storing multiple lookup tables with different gamma values and selecting appropriate tables based on grayscale thresholds and sub-pixel position (R, G, or B), the system achieves viewing angle enhancement without structural modifications. This parameter-based approach replaces the need for physical division of pixels and additional circuitry.
Solution Approach 2:
The patent introduces a new dimension of control by applying different gamma corrections to different spatial locations and grayscale ranges within the same pixel structure. Instead of dividing pixels physically (spatial segmentation), the solution creates virtual segmentation through software-based lookup tables that apply location-specific gamma values, effectively adding a computational dimension to the display control.
2Adaptability or versatility
If grayscale values are decreased to improve viewing angle, then discoloration occurs, but maintaining high grayscale values preserves color accuracy
Solution Approach 1:
The patent applies different gamma correction characteristics to different grayscale ranges and pixel locations. By using location-specific lookup tables that map grayscale values to appropriate gamma-corrected output values, the system maintains color accuracy in high grayscale regions while applying aggressive correction in low grayscale regions to improve viewing angle. This local quality approach ensures each region receives optimized treatment.
Solution Approach 2:
The patent dynamically selects between multiple lookup tables based on the current grayscale value and pixel location. Rather than using a fixed gamma correction, the system transitions between different gamma characteristics (stored in separate lookup tables) depending on the operating conditions, allowing adaptive optimization of both color accuracy and viewing angle across the entire grayscale range.
3Adaptability or versatility
If separate circuits and backlight units are added to divide pixels, then viewing angle is enhanced, but manufacturing cost and device size increase
Solution Approach 1:
The patent creates virtual copies of the display functionality through software-based lookup tables that simulate different gamma characteristics. Instead of physically duplicating circuitry or backlight units for different grayscale ranges, the system uses computational models (lookup tables) to replicate the effect of multiple display modes, achieving the same viewing angle enhancement at fraction of the cost.
Solution Approach 2:
The patent replaces the mechanical/physical system of divided pixels with separate circuits and backlight units with a software-based control system. By using lookup tables and gamma correction algorithms, the patent substitutes computational processing for physical hardware division, achieving viewing angle enhancement without additional manufacturing complexity or cost.
Data Source
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AI summary
A display apparatus and a control method thereof are provided. The display apparatus includes: a display panel including a plurality of pixels; a storage configured to store a plurality of lookup tables respectively corresponding to a plurality of gamma values; and a processor configured to determine a lookup table, from among the plurality of lookup tables, to be applied to each of the plurality of pixels based on a location of each of the plurality of pixels on the display panel, and determine a brightness value of each of the plurality of pixels using the determined lookup table.