OLED Display Edge Dimming for Pentile Color Stripe Reduction
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Solution Overview
Problem
The Pentile matrix color pixel arrangement in OLED displays results in reduced sub-pixel count and high aperture ratio, leading to issues like green and red colors appearing as lines at the edges, degrading image quality and resolution.
Innovation Solution
A dimming process is applied to adjust the grayscale values of sub-pixels at the edges of the panel, using a data processor to generate second data based on the first data pattern, reducing the visibility of specific colors at the edges by altering the luminance of red, blue, and green sub-pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the Pentile matrix color pixel arrangement is used to reduce sub-pixel count and increase aperture ratio, then the aperture ratio is improved and manufacturing complexity is reduced, but color balance errors occur at edges where green and red colors appear as lines
Solution Approach 1:
The patent applies different processing methods to different regions of the display panel. Specifically, edge sub-pixels are identified and processed differently from central sub-pixels through the data processor, which adjusts grayscale values for sub-pixels located at edges of the panel to minimize color balance errors while maintaining the Pentile arrangement's aperture ratio benefits
Solution Approach 2:
The data processor modifies the grayscale values of sub-pixels at the edges of the panel by receiving first data and generating second data with adjusted grayscale values. This parameter change reduces the visibility of color stripes at edges, effectively correcting the color balance error while preserving the Pentile matrix arrangement
2Device complexity
If sub-pixels are linearly arranged to maintain simple structure, then device complexity is low, but aperture ratio is reduced and image resolution is degraded
Solution Approach 1:
The patent transitions from a linear one-dimensional sub-pixel arrangement to a two-dimensional Pentile matrix arrangement. This dimensional change allows for better space utilization and higher aperture ratio while the data processor compensates for the increased complexity through edge correction processing
3Device complexity
If the Pentile arrangement is used to increase aperture ratio and reduce sub-pixel count, then manufacturing complexity is reduced, but image resolution and image quality are degraded due to color lines at edges
Solution Approach 1:
The data processor implements a feedback mechanism by receiving first data, processing it to generate second data with adjusted grayscale values for edge sub-pixels, and outputting the corrected data. This feedback loop continuously monitors and corrects color balance issues at edges, maintaining image quality while preserving the simplified Pentile arrangement structure
Data Source
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Figure 2C~3B
Figure 3C~3D
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.