AMOLED Display Substrate Aperture Area Ratio Optimization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current display substrates for active-matrix organic light emitting diode (AMOLED) devices face challenges in optimizing pixel structures to enhance display quality, particularly due to warpage caused by power supply lines, leading to color shifts and uneven light intensities across sub-pixels of different colors.
Innovation Solution
A display substrate design featuring a base substrate with sub-pixels that include a first metal layer with power supply lines, a planarization layer, an electrode layer, and a pixel defining layer with apertures corresponding to sub-pixels of different colors, where the orthographic projections of apertures are divided by power supply lines into specific portions, and the area ratios of these portions are optimized to range from 0.8 to 1.2 to minimize color shifts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power supply lines are placed under apertures of sub-pixels, then electrical connectivity is ensured, but warpage occurs causing color shifts and uneven light intensities
Solution Approach 1:
The patent applies local quality by making the power supply lines have different widths at different locations. Specifically, the portion of the power supply line under a first color sub-pixel has a different width than the portion under a second color sub-pixel, allowing differential compensation of warpage effects. This localized variation in line width compensates for the uneven light mixing ratios caused by warpage, thereby reducing color shifts while maintaining electrical connectivity.
2Ease of manufacture
If uniform power supply line width is used, then manufacturing is simplified, but color shifts occur due to warpage affecting different colored sub-pixels differently
Solution Approach 1:
The patent implements local quality by varying the width of power supply lines at different locations corresponding to different colored sub-pixels. This localized width variation compensates for warpage-induced differences in light mixing ratios, achieving color uniformity across different colors while maintaining relatively simple manufacturing processes.
3Reliability
If power supply lines are positioned to ensure electrical connectivity, then device functionality is maintained, but light mixing ratios become uneven across sub-pixel colors
Solution Approach 1:
The patent applies local quality by adjusting the width of power supply lines at specific locations under different colored sub-pixels. This localized width variation compensates for warpage effects that cause uneven light mixing ratios, thereby stabilizing the light mixing composition across different colors while maintaining device functionality.
Data Source
AI summary
A display substrate is provided. The display substrate includes a pixel defining layer having a plurality of apertures corresponding to the sub pixels of at least two different colors. Orthographic projections of the plurality of apertures on the base substrate each are divided by the orthographic projections of the plurality of first power supply lines on the base substrate into a first portion and a second portion. For the sub pixels of the at least two different colors, a first area ratio is a ratio between areas of the first portions of the orthographic projections of the apertures on the base substrate, a second area ratio is a ratio between areas of the second portions of the orthographic projections of the apertures on the base substrate, and a ratio between the first area ratio and the second area ratio is in a range from 0.8 to 1.2.