OLED Detection Circuit for Transistor Aging Compensation
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Solution Overview
Problem
Existing OLED display technologies face challenges in maintaining optimal light emission due to aging of light emitting elements and transistors, leading to poor display effects, as current compensation methods are inefficient in accurately accounting for changing pixel characteristic values.
Innovation Solution
A detection circuit with a switching sub-circuit and analog-to-digital conversion sub-circuit is introduced, connected to sense lines, reference, and reset power terminals, allowing for controlled data signal compensation by converting sense signals into digital signals for external compensation, thereby addressing the aging issues of transistors and improving display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external compensation is performed using sense lines to acquire transistor characteristic parameters, then the light emitting effect is improved by compensating for aging, but the device complexity increases due to additional detection circuits and analog-to-digital conversion components
Solution Approach 1:
The patent combines the detection circuit, analog-to-digital conversion sub-circuit, and switching sub-circuit into an integrated detection module that is part of the driving circuit. This merging approach consolidates multiple functions (sensing, switching, and ADC conversion) into a unified structure, reducing overall system complexity while maintaining the compensation capability for transistor aging effects.
Solution Approach 2:
The detection circuit is designed to perform multiple functions: acquiring transistor characteristic parameters through sense lines, converting analog signals to digital signals, and providing compensation data to the external compensation circuit. This multi-functional design eliminates the need for separate dedicated circuits for each function, thereby reducing device complexity while achieving reliable compensation.
2Measurement precision
If analog-to-digital conversion is performed for sense signals to enable external compensation, then the measurement precision of transistor parameters is improved, but the loss of time increases due to additional conversion steps
Solution Approach 1:
The switching sub-circuit is designed to control the connection between the sense line and the analog-to-digital conversion sub-circuit in advance, preparing the signal path before conversion is needed. This preliminary setup of switching states ensures that the ADC conversion can proceed immediately when required, minimizing delays while maintaining precise measurement capabilities.
Solution Approach 2:
The detection circuit operates in periodic phases where the switching sub-circuit alternates between connecting the sense line to different circuits (e.g., reference circuit, ADC sub-circuit). This periodic switching allows systematic acquisition and conversion of transistor parameters at scheduled intervals, balancing measurement precision with time efficiency by avoiding continuous operation.
Data Source
AI summary
The present disclosure provides a detection circuit (10) and a driving method, a driving circuit (20), a driving apparatus (100) and a display apparatus. The detection circuit (10) comprises a switching sub-circuit (101) and an analog-to-digital conversion sub-circuit (102). The switching sub-circuit (101) may control on-off states between a sense line (SL) and a reference power terminal (VF), a reset power terminal (RST) and the analog-to-digital conversion sub-circuit (102) according to control signals provided by the external compensation circuit (01). Wherein, a sense signal may include pixel characteristic values or may be a reference power signal.