OLED Pixel Light Emission Region Area Perimeter Ratio Design
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Solution Overview
Problem
Conventional OLED displays experience deviations in area ratios and critical dimensions of light emission regions due to process deviations, leading to inconsistent performance across pixels, particularly between those in the center and outer edge portions of the display.
Innovation Solution
The OLED display is designed such that the area and perimeter ratios of different light emission regions within each pixel satisfy specific equations (e.g., A1*P2=A2*P1), ensuring equivalent area ratios across pixels despite variations in critical dimensions, with regions formed by openings in a pixel defined layer and featuring distinct border shapes and non-light emission regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional OLED displays are manufactured with standard light emission regions, then manufacturing is simpler, but area ratios and critical dimensions deviate due to process variations, leading to inconsistent pixel performance
Solution Approach 1:
The patent applies local quality by making different light emission regions (red, green, blue) have different area ratios and critical dimensions tailored to their specific characteristics. Each color region is optimized independently with specific geometric parameters to compensate for process deviations, rather than using uniform dimensions across all regions.
Solution Approach 2:
The patent changes geometric parameters (area ratios, critical dimensions, perimeter lengths) of light emission regions to achieve consistent performance. By adjusting these parameters according to the equation A1×P2=A2×P1, the patent compensates for process variations and maintains uniform pixel characteristics across the display.
2Reliability
If light emission regions have different area ratios to compensate for process deviations, then pixel performance consistency improves, but the design and manufacturing complexity increases
Solution Approach 1:
The patent incorporates feedback by establishing a mathematical relationship (A1×P2=A2×P1) that connects the geometric parameters of different light emission regions. This feedback mechanism ensures that adjustments in one region automatically determine the required dimensions of other regions, maintaining consistency across the display.
Solution Approach 2:
The patent creates a universal design rule that applies to all pixels across the display. The equation A1×P2=A2×P1 serves as a universal relationship that ensures consistent pixel performance regardless of position, making the compensation method applicable throughout the entire display area.
3Ease of manufacture
If all light emission regions have the same area and perimeter, then manufacturing is easier, but process deviations cause inconsistent life spans and performance across different color regions
Solution Approach 1:
The patent applies local quality by assigning different area and perimeter characteristics to different color regions based on their specific requirements. Red, green, and blue regions have differently sized and shaped light emission areas optimized for their respective lifetimes and performance characteristics.
Solution Approach 2:
The patent introduces dynamic adjustment of geometric parameters to compensate for the different degradation rates of various color materials. By making the light emission region dimensions variable rather than fixed, the patent optimizes the lifetime balance across different colors.
Data Source
AI summary
An OLED display includes pixels, each including a first light emission region having a first area and a first perimeter and a second light emission region disposed neighboring the first light emission region and having a second area and a second perimeter. The first area, the first perimeter, the second area, and the second perimeter respectively satisfy an equation of A1*P2=A2*P1, where A1 is the first area, P1 is the first perimeter, A2 is the second area, and P2 is the second perimeter.