AMOLED Display Substrate Electrode Layout for Brightness Uniformity
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Solution Overview
Problem
Existing display substrates for active-matrix organic light-emitting diode (AMOLED) displays face challenges in achieving uniform pixel brightness due to differences in parasitic capacitance between sub-pixels, leading to issues with display uniformity and effectiveness.
Innovation Solution
The display substrate incorporates a design where each sub-pixel has a light-emitting element with a first and second light-emitting voltage application electrode, and a pixel circuit with a drive circuit. The sub-pixels are arranged such that the orthographic projection of the light-emitting voltage application electrodes overlaps with the control terminals of the drive circuit, reducing parasitic capacitance differences and enhancing brightness uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the orthographic projection of the light-emitting voltage application electrode overlaps with the control terminal of the drive circuit, then parasitic capacitance is reduced and brightness uniformity is improved, but the device complexity increases due to specific layout requirements
Solution Approach 1:
The patent merges the light-emitting voltage application electrode with the control terminal of the drive circuit by making their orthographic projections overlap on the base substrate. This integration reduces parasitic capacitance between these components while maintaining compact pixel structure, directly addressing the brightness uniformity issue without significantly increasing overall device complexity.
2Reliability
If the shape of the light-emitting voltage application electrode is varied between sub-pixels, then parasitic capacitance differences are reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies local quality by varying the shape of the light-emitting voltage application electrode according to the specific sub-pixel type (first sub-pixel versus second sub-pixel). Each sub-pixel receives a customized electrode shape that optimizes its parasitic capacitance characteristics, achieving uniformity across different sub-pixel types while maintaining manufacturability through defined geometric variations.
Data Source
AI summary
A display substrate, a preparation method thereof, a display panel, and a display device are provided. The display substrate includes a base substrate and a repeating unit, the repeating unit includes a plurality of sub-pixels including a first sub-pixel and a second sub-pixel, a color of light emitted by a light-emitting element of the first sub-pixel is identical to a color of light emitted by a light-emitting element of the second sub-pixel, a shape of a first light-emitting voltage application electrode of the light-emitting element of the first sub-pixel is different from a shape of a first light-emitting voltage application electrode of the light-emitting element of the second sub-pixel.