OLED Aperture Ratio Compensation for Luminance Uniformity
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Solution Overview
Problem
Organic light emitting display (OLED) devices face luminance uniformity issues due to voltage drops in high power voltage transmission, leading to reduced emission current and non-uniform luminance across the display panel, especially as the panel width increases.
Innovation Solution
The method involves determining pixel groups based on their distances from the power unit, calculating and applying different aperture ratios to these groups, and forming specific patterns on over-coating layers to adjust light distribution, thereby compensating for voltage drops and maintaining luminance uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the display panel width is increased, then the display area is expanded, but voltage drops in high power voltage transmission increase leading to non-uniform luminance
Solution Approach 1:
The patent applies local quality by dividing the display panel into multiple pixel groups with different aperture ratios based on their distance from the power unit. Pixel groups farther from the power unit have larger aperture ratios to compensate for voltage drops, while those closer have smaller aperture ratios. This localized differentiation ensures uniform luminance across the entire expanded display area.
Solution Approach 2:
The patent changes the aperture ratio parameter of pixels based on their spatial position relative to the power unit. By calculating and applying different aperture ratios to different pixel groups, the system compensates for the voltage drops that occur in wider display panels, thereby maintaining luminance uniformity across the expanded area.
2Ease of manufacture
If uniform aperture ratios are applied to all pixels, then manufacturing is simplified, but luminance uniformity deteriorates due to voltage drops
Solution Approach 1:
Instead of applying a uniform aperture ratio, the patent implements local quality by assigning different aperture ratios to different pixel groups based on their distance from the power unit. This approach prioritizes luminance uniformity over manufacturing simplicity, accepting the need for differentiated aperture ratios to compensate for voltage drops in the power transmission network.
Solution Approach 2:
The patent segments the display panel into multiple pixel groups, each with its own calculated aperture ratio. This segmentation allows the system to address the luminance uniformity issue by treating different regions differently, rather than applying a single uniform aperture ratio to all pixels.
3Reliability
If aperture ratios are increased for pixels farther from the power unit, then luminance uniformity is improved, but the quantity of patterns on over-coating layers increases
Solution Approach 1:
The patent changes the aperture ratio parameter for pixel groups based on their distance from the power unit. This parameter change directly addresses luminance uniformity by compensating for voltage drops, while the resulting increase in pattern quantity on over-coating layers is an acceptable trade-off for achieving uniform luminance across the display panel.
Data Source
AI summary
A method of manufacturing a display panel of an organic light emitting display device includes determining a plurality of pixel groups, the pixel groups corresponding to groups of pixels of the display panel, calculating aperture ratios for the pixels, respective aperture ratios being calculated by pixel group based on respective distances between a power unit and the pixel groups, and forming the pixels of the display panel to have the respective aperture ratios according to the corresponding pixel groups.