OLED Gamma Correction for Luminance Deterioration
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Solution Overview
Problem
Display devices, particularly OLEDs, experience luminance deterioration over time, leading to adverse effects such as reduced brightness and color shifts, which existing gamma correction methods fail to adequately address.
Innovation Solution
A method and device for periodically measuring single color luminance on a display panel, calculating luminance differences, and adjusting gamma settings based on these measurements to maintain optimal luminance and color coordinates, using an offset value from a lookup table to compensate for pixel deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gamma correction is performed using conventional methods, then the displayed luminance can be adjusted, but it fails to adequately address luminance deterioration and color shifts over time
Solution Approach 1:
The patent applies preliminary action by measuring the luminance characteristics of each color component (red, green, blue) in advance and storing these measurements. Based on these pre-measured characteristics, the system proactively adjusts the gamma settings for each color component before significant deterioration occurs, rather than reacting after the problem manifests. This allows the display device to maintain accurate color reproduction over time by compensating for aging effects.
Solution Approach 2:
The patent changes the gamma parameters separately for each color component (Rgamma, Ggamma, Bgamma) based on their individual luminance characteristics. Instead of using a single global gamma value, the system adjusts each color channel's gamma independently according to its deterioration rate and luminance properties. This differential parameter adjustment resolves the contradiction by maintaining reliability through customized compensation for each color component's temporal degradation.
2Manufacturing precision
If the gamma setting is adjusted to compensate for deteriorated color components, then color accuracy improves, but the voltage level distribution across color components becomes uneven
Solution Approach 1:
The patent applies local quality by adjusting the gamma setting specifically for deteriorated color components while leaving non-deteriorated components unchanged. The system identifies which color components (red, green, or blue) have deteriorated and applies compensation only to those specific components. This localized adjustment improves color accuracy without unnecessarily increasing voltage stress on already healthy pixels, thereby resolving the contradiction between color precision and voltage stress distribution.
3Measurement precision
If single color luminance measurements are performed periodically, then pixel deterioration can be detected and corrected, but the system complexity increases
Solution Approach 1:
The patent applies self-service by having the display device measure its own luminance characteristics using integrated sensors or measurement capabilities within the device itself. The system performs self-diagnosis of color component deterioration and automatically adjusts its own gamma settings without requiring external measurement equipment or complex external control systems. This self-service approach achieves precise luminance measurement while minimizing system complexity by utilizing the device's own resources.
Data Source
AI summary
Methods of correcting gamma and a display device employing the same are disclosed. In one aspect, the method includes periodically measuring, at a plurality of predetermined times, a single color measurement luminance related to a single color component that is displayed on the display panel. The method further includes calculating a luminance difference between the single color measurement luminance and a single color target luminance. The single color target luminance is a target luminance of the single color component at each of the predetermined times. The method also includes changing a gamma setting for a plurality of data signals provided to the display panel based on the luminance difference.