Display Substrate Anode Segmentation for Uniform OLED Brightness
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Solution Overview
Problem
Rigid LCD screens fail to meet modern display needs, and existing OLED displays face issues with brightness uniformity due to large capacitive loads in non-driving areas, leading to reduced brightness and increased borders, affecting display quality.
Innovation Solution
A display substrate design with differentiated anode areas in driving and non-driving regions, connected via conductive traces, reduces capacitive loads by minimizing anode areas in non-driving regions, ensuring uniform brightness across the display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the anode area is increased to improve light emission, then the brightness increases, but the capacitive load increases causing brightness non-uniformity and larger borders in non-driving areas
Solution Approach 1:
The patent applies local quality by differentiating the anode structure into two types: first anodes in the first display area with standard dimensions, and second anodes in the second display area with reduced dimensions. This local differentiation ensures that pixels in non-driving areas have smaller capacitive loads, thereby achieving uniform brightness across the entire display while maintaining adequate light emission in both regions.
2Reliability
If the anode area is decreased to reduce capacitive load, then the brightness uniformity improves, but the light emission intensity decreases
Solution Approach 1:
The patent segments the display area into a first display area with standard pixels and a second display area with modified pixels. By dividing the display into these functional segments, the invention allows different anode configurations in different regions, optimizing both brightness uniformity (through smaller anodes in non-driving areas) and light emission (through standard anodes in driving areas).
3Ease of manufacture
If the anode area is made uniform across all pixels, then the manufacturing process is simplified, but the display quality deteriorates due to brightness non-uniformity and visible borders
Solution Approach 1:
The patent implements local quality by configuring different anode structures in different display areas. The first anodes in the first display area maintain standard dimensions for optimal light emission, while the second anodes in the second display area have reduced dimensions to minimize capacitive loads. This localized differentiation resolves the contradiction by prioritizing display quality in non-driving areas without complicating the overall manufacturing process.
Data Source
AI summary
A display substrate and a display device are provided. The display substrate includes: a substrate and sub-pixels including a sub-pixel driving circuit and a light-emitting element, the display substrate including a first display area and a second display area located around the first display area, the first display area is provided with the sub-pixel driving circuit and the light-emitting element, the second display area is provided with the light-emitting element, the second display area is not provided with the sub-pixel driving circuit, the anode of the light-emitting element in the second display area is connected to the sub-pixel driving circuit arranged in the first display area through a first conductive trace; the area of at least part of the anode of the second display area is smaller than the area of the anode of the sub-pixel of the same color in the first display area.