Display Substrate Auxiliary Electrode Lines for Uniform OLEDs
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Solution Overview
Problem
High-resolution OLED displays face challenges with increased pixel density and signal line resistance-capacitance loads, leading to issues like color shift and non-uniform display due to voltage drops and rises.
Innovation Solution
The display substrate design includes auxiliary electrode lines connected in parallel with power lines and spaced from data lines to reduce resistance, and incorporates a specific pixel circuit arrangement to manage electrical characteristics, using transistors and capacitors to maintain consistent power distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pixel density is increased for high-resolution display, then display resolution is improved, but signal line resistance-capacitance load increases causing voltage drops and color shift
Solution Approach 1:
The power supply network is segmented into multiple auxiliary electrode lines distributed across the display substrate. Each auxiliary electrode line serves a specific region, reducing the distance current must travel and minimizing voltage drops in high-density pixel configurations
Solution Approach 2:
Auxiliary electrode lines act as intermediary power distribution channels between the main power lines and individual pixels. These intermediaries reduce the RC load on signal lines by providing localized power replenishment, thereby maintaining display uniformity without compromising resolution
2Reliability
If power line resistance is reduced to alleviate voltage drops, then display uniformity is improved, but device complexity increases due to additional auxiliary electrode lines
Solution Approach 1:
The auxiliary electrode lines perform multiple functions: they serve as power distribution channels, act as reference electrodes for voltage stabilization, and provide structural support for the transparent electrode layer. This multi-functionality reduces the need for separate dedicated components, offsetting the added complexity
Solution Approach 2:
The conductivity and dimensions of the auxiliary electrode lines are optimized to achieve the desired voltage distribution. By adjusting parameters such as line width, material composition, and spacing, the system achieves improved display uniformity without requiring excessive additional structures
Data Source
AI summary
A display substrate and a display device are provided. The display substrate includes a base substrate and sub-pixels on the base substrate. The sub-pixels are arranged in a sub-pixel array in a first direction and a second direction, the first direction intersecting with the second direction. The display substrate further includes data lines extended in the first direction, and the data lines are connected in one-to-one correspondence with the sub-pixels in columns in each row of sub-pixels, so as to provide data signals respectively; the display substrate further includes auxiliary electrode lines extended in the first direction which are configured to be electrically connected with a second electrode of the light emitting element to provide a second power voltage; each of the auxiliary electrode lines is spaced from any one of the plurality of data lines by at least one column of sub-pixels.