OLED Pixel Reset Circuit for High-Brightness Lifetime Extension
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Solution Overview
Problem
Existing OLED display technologies face challenges in achieving both high brightness and a long service life, particularly in applications requiring 8-10 years of operation, such as vehicle-mounted displays, where the average service life of 3-4 years is insufficient.
Innovation Solution
A display substrate design incorporating pixel circuits with drive, data write, compensation, storage, and reset sub-circuits, including a first and second reset sub-circuit, and a reverse biasing mechanism to prolong the lifetime of light-emitting elements by alternately applying forward and reverse biases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If OLED display devices operate at high brightness, then illumination intensity is improved, but service life deteriorates
Solution Approach 1:
The patent implements periodic reverse biasing of the light-emitting element through a reset circuit that applies reverse voltage during non-display periods. This periodic action alternates between forward bias (during light emission) and reverse bias (during reset), preventing continuous degradation and extending service life while maintaining high brightness capability
Solution Approach 2:
The reset circuit applies reverse bias voltage to the light-emitting element before the next forward bias cycle begins. This preliminary anti-action counteracts the accumulation of degradation effects during high brightness operation, neutralizing harmful effects before they can significantly reduce service life
2Duration of action of stationary object
If a reset circuit with multiple terminals is added to the pixel circuit, then service life is improved, but device complexity increases
Solution Approach 1:
The patent merges the reset circuit with the existing pixel circuit structure by sharing common terminals and integrating the reset functionality into the pixel's existing architecture. The reset circuit shares terminals with the light-emitting element and other pixel components, reducing the need for completely separate additional components
Solution Approach 2:
The reset circuit is designed to perform multiple functions: it provides reverse bias for lifetime extension, maintains voltage levels during non-display periods, and integrates with the existing pixel circuit operations. This multi-functionality reduces the need for separate dedicated circuits for each function
Data Source
AI summary
A display substrate and a display device are provided. The display substrate includes a base substrate and a plurality of sub-pixels on the base substrate, each sub-pixel includes a pixel circuit, and the pixel circuit includes a first reset sub-pixel. The first reset sub-pixel is configured to apply a first reset voltage to a light-emitting element in response to a first reset control voltage to reversely bias the light-emitting element.