Pentile OLED Pixel Layout for Uniform Data Line Resistance
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Solution Overview
Problem
Organic light emitting display (OLED) devices with a stripe pixel arrangement face issues with aperture reduction and degraded high-resolution display performance due to the black matrix between pixels, leading to suboptimal color purity and luminance.
Innovation Solution
The implementation of a pentile matrix structure in OLED devices, where first and second pixel columns with different colors are arranged alternately, with data lines connected through contact holes of varying sizes and numbers to ensure matched signal resistance and reduce vertical line defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a stripe pixel arrangement is used in OLED devices, then the structure is simple and easy to manufacture, but the aperture is decreased by the black matrix and high-resolution display performance is degraded
Solution Approach 1:
The patent applies asymmetry by implementing a pentile matrix structure where green pixels are positioned at different locations compared to red and blue pixels. This asymmetric arrangement eliminates the need for a black matrix between pixels, thereby increasing aperture while maintaining manufacturability. The unequal positioning of green pixels creates a staggered pattern that allows adjacent pixels to share color information, achieving high-resolution display without the constraints of traditional symmetric stripe arrangements.
2Device complexity
If data lines are connected through contact holes with equal size and number for first and second pixel columns, then the structure is symmetric and simple, but signal resistance deviation occurs causing vertical line defects
Solution Approach 1:
The patent applies local quality by making the contact holes for the second pixel column different from those of the first pixel column. Specifically, the second pixel column contact holes have larger areas or greater numbers to compensate for higher signal resistance in that column. This localized adjustment ensures uniform signal transmission across both pixel columns, preventing vertical line defects while maintaining overall structural simplicity.
Data Source
AI summary
A display device includes a substrate including a display area and a non-display area, a pixel unit provided in the display area, and including a first pixel column including a plurality of pixels and a second pixel column including a plurality of pixels displaying a different color from a color of the first pixel column, and data lines which are respectively connected to the first pixel column and the second pixel column, and respectively apply data signals to the first pixel column and the second pixel column, wherein the data line connected to the first pixel column includes sub lines and the data line connected to the second pixel column includes sub lines.