OLED Luminance Compensation via Pixel Data Redistribution
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Solution Overview
Problem
Organic light emitting display devices face issues with rapid deterioration and non-uniform luminance due to the digital and hybrid driving methods, which affect image quality and gray scale expression.
Innovation Solution
A method and device for adjusting luminance by deriving initial compensation data from optical images, generating a look-up table, measuring pixel deterioration, updating the table with a filter, and redistributing compensation data among pixels to maintain average luminance and improve low gray scale expression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If digital driving method or hybrid driving method is used, then size and resolution of display panel can be increased, but organic light emitting diode deteriorates rapidly and luminance becomes non-uniform
Solution Approach 1:
The patent applies preliminary action by measuring the initial luminance of each pixel before driving and storing compensation values in advance. This pre-measurement and pre-compensation approach allows the system to counteract deterioration effects before they significantly impact display quality, thereby extending OLED durability while maintaining large panel size
Solution Approach 2:
The patent implements feedback by continuously monitoring pixel luminance characteristics, comparing measured values against reference standards, and adjusting driving signals accordingly. This closed-loop feedback mechanism compensates for OLED deterioration in real-time, maintaining reliability in large displays using digital or hybrid driving methods
2Area of stationary object
If digital driving method or hybrid driving method is used, then display panel size and resolution can be increased, but luminance uniformity deteriorates
Solution Approach 1:
The patent applies local quality by measuring and compensating luminance characteristics for each individual pixel or small group of pixels rather than treating the entire display uniformly. This localized compensation approach addresses spatial variations in luminance across large panels, ensuring uniformity despite the increased display area
Solution Approach 2:
The patent changes driving parameters (voltage, current, pulse width) based on measured luminance characteristics of different regions. By dynamically adjusting these parameters according to local luminance needs, the system maintains uniform appearance across large display panels using digital or hybrid driving methods
3Reliability
If compensation data is concentrated in specific pixels, then those pixels can be compensated, but adjacent pixels show non-uniform luminance
Solution Approach 1:
The patent merges compensation data from multiple pixels and distributes the compensated values to adjacent pixels. This combining approach ensures that when one pixel is compensated, its neighbors also receive appropriate compensation, eliminating non-uniform luminance boundaries and maintaining overall display uniformity
Data Source
AI summary
A method of adjusting luminance of an organic light emitting display device is provided. By the method, initial compensation data are derived from optical images of a plurality of pixels, a look-up table (LUT) is generated using the initial compensation data, compensation data are derived by measuring deterioration degrees of the pixels, the LUT is updated by applying a filter for redistributing the compensation data among the pixels, an operation for adjusting the luminance are performed with image data of the pixels and the compensation data stored in the LUT, and driving data that are calculated by the operation for adjusting the luminance are outputted.