Display Gamma and Mura Correction Integration
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Solution Overview
Problem
Current display apparatuses face challenges in effectively compensating Mura defects and gamma differences, leading to distorted color artifacts due to cumbersome processes of separate gamma and Mura corrections.
Innovation Solution
A display apparatus and method that utilize gamma look-up tables (LUTs) and Mura correction LUTs to calculate and apply correction values simultaneously, integrating gamma and Mura corrections to input data, thereby reducing or eliminating color distortion artifacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate gamma correction and Mura correction processes are used, then each correction can be applied independently, but the process becomes cumbersome and causes color distortion artifacts
Solution Approach 1:
The patent combines separate gamma correction and Mura correction processes into a single integrated correction process. The correction value calculation unit simultaneously calculates both gamma correction values and Mura correction values based on the same input grayscale value, merging two independent correction streams into one unified operation that eliminates color distortion artifacts while reducing process complexity.
Solution Approach 2:
The correction value calculation unit serves multiple functions: it calculates gamma correction values, calculates Mura correction values, and generates combined correction data all within a single processing unit. This multi-functional approach eliminates the need for separate correction circuits and processes, reducing overall system complexity while maintaining comprehensive correction capabilities.
2Reliability
If multiple correction steps are performed sequentially, then comprehensive correction is achieved, but processing time increases
Solution Approach 1:
The patent merges sequential gamma correction and Mura correction operations into a single parallel processing step. Both correction values are calculated simultaneously from the same input grayscale value, and the correction data is generated in one operation rather than through multiple sequential steps, thereby reducing processing time while maintaining comprehensive defect compensation.
Solution Approach 2:
The correction value calculation unit performs preliminary calculations for both gamma and Mura corrections in advance, storing correction values in lookup tables (LUTs) that can be quickly retrieved during operation. This preliminary preparation of correction data enables fast real-time correction without requiring complex sequential processing during actual display operation.
Data Source
AI summary
A method of driving a display apparatus including generating first gamma correction data of input data using a first gamma look-up table (“LUT”), determining a Mura correction value of the first gamma correction data, adding the Mura correction value to the input data to generate added input data, generating second gamma correction data of the added input data using the first gamma LUT, and driving a pixel in the display panel using the second gamma correction data of the added input data. The Mura correction value is determined after the gamma correction data is generated, and the generating of the added input data is performed prior to any gamma correction being performed on the input data.