OLED Edge Sub-Pixel Dimming for Pentile Color Line Artifacts
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The Pentile matrix color pixel arrangement in OLED displays results in green and red colors being perceived as lines at the edges, degrading image quality and resolution due to reduced aperture ratio and sub-pixel density.
Innovation Solution
A method of driving OLED displays by adjusting grayscale values of sub-pixels at the edges using a dimming process, specifically through a data processor that generates second data by altering the grayscale values of first data based on the sub-pixel color arrangement, particularly for edges of the panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If sub-pixels are linearly arranged to maximize aperture ratio, then aperture ratio is improved, but image resolution is degraded due to black non-emitting structures between sub-pixels
Solution Approach 1:
The patent segments the pixel arrangement into different types: pentile matrix arrangement for most regions to maximize aperture ratio, and linear arrangement for edge regions to maintain image quality. This segmentation allows each region to be optimized for its specific function.
Solution Approach 2:
The patent applies different sub-pixel arrangement strategies to different regions of the display panel. Edge regions use linear arrangement with adjusted grayscale values to maintain sharp transitions, while inner regions use pentile matrix arrangement for higher aperture ratio. This local optimization resolves the contradiction between aperture ratio and resolution.
2Area of stationary object
If Pentile matrix color pixel arrangement is used to increase aperture ratio, then aperture ratio is improved, but color line artifacts appear at edges degrading image quality
Solution Approach 1:
The patent identifies edge regions as special zones where Pentile arrangement causes visible artifacts. By applying linear arrangement specifically to edge regions while maintaining Pentile arrangement in inner regions, the patent preserves high aperture ratio without color line artifacts at edges.
Solution Approach 2:
The data processor preemptively adjusts grayscale values of sub-pixels at edge regions before they are displayed. This preliminary modification prevents color line artifacts from becoming visible, while the Pentile arrangement maintains its high aperture ratio benefit in inner regions.
3Device complexity
If Pentile matrix arrangement is used to reduce number of sub-pixels, then manufacturing complexity is reduced, but image resolution is degraded
Solution Approach 1:
The patent segments the display into edge regions and inner regions, applying different sub-pixel arrangements to each. Edge regions use linear arrangement for sharp transitions, while inner regions use Pentile arrangement for manufacturing simplicity and high aperture ratio.
Solution Approach 2:
The patent changes the arrangement parameter (linear vs. Pentile matrix) based on spatial position, and also adjusts grayscale values as a parameter modification for edge sub-pixels. This allows the system to achieve both manufacturing simplicity and high image quality.
Data Source
AI summary
An organic light emitting display device and a driving method thereof are disclosed. The display device has sub-pixels of multiple colors. In one aspect, the organic light emitting display device detects sub-pixels which are positioned at the edges of the panel. Data for the sub-pixels on the edges are reduced so that colors on the edges are less observable.