OLED Degradation Sensing by Region-Specific Images
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Solution Overview
Problem
Conventional compensation methods for organic light-emitting display devices assume uniform degradation across panels or regions, leading to compensation errors and image sticking due to process variations, which result in inconsistent brightness across pixels.
Innovation Solution
A light-emitting display device and method that includes a degradation sensing unit to estimate the degradation level of organic light-emitting diodes by sensing electrical physical quantities for each panel or region, generating and displaying sensing images to accurately compensate for threshold voltage and electron mobility variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional external compensation method is used assuming uniform degradation, then compensation process is simple, but compensation error occurs and image sticking appears due to process variation
Solution Approach 1:
The patent segments the display panel into multiple regions and performs separate degradation sensing for each region. The panel is divided into first and second regions, with sensing images specifically designed to target each region. This allows independent degradation measurement for each region, accounting for process variations across different areas of the panel.
Solution Approach 2:
The patent applies local quality by using region-specific sensing images and separate degradation sensing for each panel region. Different sensing images are generated and displayed to sense degradation in different regions independently, allowing compensation parameters to be optimized for each local region rather than applying a uniform compensation across the entire panel.
2Measurement precision
If degradation sensing is performed for each panel or region, then compensation precision is improved, but device complexity increases due to multiple sensing images and regions
Solution Approach 1:
The patent performs preliminary degradation sensing before normal display operation. Multiple sensing images are generated and displayed in advance to measure degradation characteristics of each region. Based on these preliminary measurements, compensation parameters are determined and stored, which are then applied during normal display operation to correct for degradation without requiring continuous complex sensing.
Solution Approach 2:
The patent uses sensing images as simplified copies or representations of the actual display content. These sensing images contain specific patterns or characteristics that allow degradation measurement without requiring full-color, high-resolution display content. The sensing images serve as surrogate stimuli that preserve the essential degradation information while reducing system complexity.
Data Source
AI summary
A light-emitting display device includes a display panel including a high-potential power voltage line and a low-potential power voltage line and provided with a plurality of pixels each including a driving transistor and an organic light-emitting diode, a timing controller configured to generate N (N being a natural number) sensing images depending on a size of accumulated image data by accumulating image data for each pixel, and to display the display panel of data of at least one sensing image of the N sensing images on the display panel and to obtain an amount of degradation of organic light-emitting diodes in a sensing mode, and a degradation sensing unit configured to estimate the amount of degradation of the organic light-emitting diodes by sensing an electrical physical quantity for each panel or for each region in a panel in a state in which the at least one sensing image is displayed on the display panel, and to provide the amount of degradation of the organic light-emitting diodes to the timing controller.