Burn-in Correction for Light-emitting Display Panels
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Solution Overview
Problem
Existing burn-in correction methods for light-emitting display panels, such as organic EL displays, face inaccuracies in estimating deterioration differences between pixels, leading to potential errors in correction operations due to changing display content.
Innovation Solution
A burn-in correction technology that includes a deterioration amount difference calculation section, correction amount calculation section, deterioration amount difference correction section, gamma conversion section, and estimation error detection section to accurately correct gradation values and eliminate errors by updating the gamma conversion input-output relation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If burn-in correction is performed in parallel with displaying pictures using estimated deterioration amounts, then correction operation can be performed without stopping display, but accuracy of correction deteriorates due to errors between estimated and actual deterioration amounts
Solution Approach 1:
The patent implements feedback by detecting the actual deterioration amount of the reference pixel during picture display and using this detected value to correct the estimated deterioration amounts. The system continuously monitors actual deterioration and adjusts correction operations based on the difference between estimated and actual values, thereby maintaining high correction accuracy while performing correction in parallel with picture display.
Solution Approach 2:
The patent performs preliminary estimation of deterioration amounts for all pixels based on display content analysis before actual deterioration occurs. This preliminary correction is then refined by comparing with actual deterioration measurements, allowing the system to proactively correct burn-in while maintaining display continuity.
2Manufacturing precision
If deterioration amount difference correction is performed for each pixel based on reference pixel deterioration, then uniformity of luminance across display area is improved, but complexity of correction system increases due to multiple calculation sections required
Solution Approach 1:
The patent merges the correction operations by using a single reference pixel's deterioration amount as the basis for correcting all other pixels in the display area. Instead of independently monitoring each pixel, the system combines measurements from one reference pixel with display content analysis to estimate and correct deterioration across the entire display, thereby reducing system complexity while maintaining luminance uniformity.
Solution Approach 2:
The reference pixel serves multiple functions: it acts as both a measurement point for actual deterioration and a basis for estimating deterioration of all other pixels. The deterioration amount difference calculation section uses the reference pixel data universally to correct the entire display area, making the correction system more efficient and less complex.
3Measurement precision
If gamma conversion is performed to correct estimation errors, then accuracy of correction operation is improved, but additional processing time is required for error detection and gamma conversion
Solution Approach 1:
The patent performs gamma conversion and error correction at periodic intervals rather than continuously. The system detects estimation errors by comparing actual and estimated deterioration amounts at specific time points, then applies gamma conversion corrections periodically. This periodic approach maintains high correction accuracy while minimizing the time loss associated with error detection and correction processing.
Data Source
AI summary
A light-emitting display device is disclosed. The display includes: a display panel having a plurality of light-emitting elements disposed on a substrate in a matrix; a deterioration amount difference calculation section; a correction amount calculation section; a deterioration amount difference correction section; a gamma conversion section; an actual deterioration amount calculation section; and an estimation error detection section.