OLED Display Subpixel Layout for Balanced Gate Node Loads
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Solution Overview
Problem
Current organic light emitting diode (OLED) display technologies face challenges in achieving uniform brightness across sub-pixels due to differences in gate node loads, leading to variations in display characteristics.
Innovation Solution
A display substrate design featuring a base substrate with sub-pixels arranged in specific configurations, including first and second pixel blocks within a color sub-pixel pair, where the second electrode of the light emitting element and the gate electrode of the driving transistor have overlapping areas that balance the electrical environment, and a planarization layer with via holes for electrical connections, ensuring balanced gate node coverage and reduced brightness differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If sub-pixels are arranged with different minimum distances, then color uniformity is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies asymmetry by setting different minimum distances for different color sub-pixels. Specifically, the minimum distance between sub-pixels of a first color is set to be different from the minimum distance between sub-pixels of a second color. This asymmetric arrangement compensates for the different luminous characteristics of different colors, improving overall color uniformity across the display panel.
2Reliability
If overlapping areas between second electrode and gate electrode are increased, then electrical balance is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies equipotentiality by designing the overlapping areas between the second electrode and gate electrode of driving transistors to be substantially equal. This equal overlapping area design balances the electrical environment for different color sub-pixels, ensuring consistent threshold voltages and reducing brightness differences across the display.
3Reliability
If via holes are positioned to overlap with effective light emitting regions, then electrical connection is improved, but light emission efficiency decreases
Solution Approach 1:
The patent applies local quality by positioning via holes in different locations for different color sub-pixels. Specifically, via holes for first color sub-pixels are positioned to overlap with effective light emitting regions, while via holes for second color sub-pixels are positioned to avoid overlapping with effective light emitting regions. This localized differentiation optimizes both electrical connection and light emission efficiency for each color type.
Data Source
AI summary
A display substrate and a display device are provided. A sub-pixel in the display substrate includes a light emitting element and a pixel circuit; the light emitting element includes a first electrode, a light emitting layer and a second electrode; the pixel circuit includes a driving transistor and a storage capacitor. The sub-pixel includes a first color sub-pixel pair which includes a first pixel block and a second pixel block. In a same first color sub-pixel pair, an overlapping situation, of orthographic projections of the second electrode of one first pixel block and a gate electrode of the driving transistor of the one first pixel block on the base substrate, is the same as an overlapping situation, of orthographic projections of the second electrode of one second pixel block and a gate electrode of the driving transistor of the one second pixel block on the base substrate.