Display Luminance Correction via Gamma-Adjusted Imaging Map
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Solution Overview
Problem
Existing display technologies face challenges in correcting luminance unevenness in ordinary user environments without the need for high-precision cameras, making it costly and impractical to achieve uniform display performance.
Innovation Solution
A display device with a gradation correction map generation device that creates a corresponding relationship between screen positions and correction values for gradation, using a luminance unevenness map and a second gamma characteristic to correct luminance unevenness without requiring high-precision camera measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-precision camera is used to measure luminance unevenness, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces expensive high-precision cameras with ordinary imaging devices that can be easily obtained. The system uses standard gamma correction techniques that are already built into ordinary displays and cameras, eliminating the need for specialized measurement equipment while achieving sufficient correction accuracy for ordinary user environments.
Solution Approach 2:
The patent creates a virtual model of the luminance unevenness by imaging a white screen and processing the captured image through gamma correction. This virtual luminance map serves as a copy of the actual luminance distribution, allowing correction without direct high-precision measurement. The system captures the luminance characteristics through software processing rather than specialized hardware.
2Ease of operation
If simple correction method is used, then ease of operation is improved, but manufacturing precision deteriorates
Solution Approach 1:
The patent applies gamma correction to transform the luminance values captured by the ordinary imaging device. By changing the parameter space from linear luminance to gamma-corrected luminance, the system achieves better correction results using simple operations. The gamma transformation compensates for the non-linear response of ordinary cameras and displays, improving correction precision without complicating the operation.
Solution Approach 2:
The system creates a feedback loop by capturing the displayed white screen, processing the image through gamma correction to generate a luminance map, and then using this map to correct future displays. This closed-loop approach allows ordinary imaging devices to achieve precision comparable to specialized equipment through iterative correction based on actual display characteristics.
Data Source
AI summary
A display device includes a video input unit that receives a video signal; a display control unit that corrects the video signal; and a display unit that has a screen on which a video according to the corrected video signal is displayed. The display device further includes a gradation correction map generation device that generates a gradation correction map which indicates a corresponding relationship between a plurality of positions on the screen and a correction value for gradation of the video signal at each of the positions; the gradation correction map generation device generates the gradation correction map according to a luminance unevenness map which indicates a corresponding relationship between the plurality of the positions and uncorrected luminance, which is luminance when correction is not performed, at each of the positions, and a second gamma characteristic which indicates a corresponding relationship between luminance at a specific position on the screen.