OLED Aging Compensation via Dynamic Drive Adjustment
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Solution Overview
Problem
OLED displays experience a gradual decrease in display brightness and residual images due to aging of organic materials, which existing aging compensation methods are unable to effectively address.
Innovation Solution
An aging compensation system and method that utilize a network of pixel circuits, data lines, sense lines, and power supplies to sense and generate compensation voltages based on the voltage and mobility of OLED devices, ensuring uniform luminous current across pixels and improving display brightness and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If existing aging compensation methods are applied to OLED displays, then display mura can be compensated, but display brightness gradually decreases and residual images remain
Solution Approach 1:
The patent implements a feedback mechanism where the OLED device senses its own voltage and mobility parameters, and the driving transistor adjusts its operation based on this feedback to compensate for aging effects. The sense line measures the actual OLED voltage, and the driving transistor uses this information to dynamically adjust drive signals, creating a closed-loop system that maintains display quality over time.
Solution Approach 2:
The patent changes the operational parameters of the driving transistor dynamically to compensate for OLED aging. By adjusting the threshold voltage and mobility parameters of the driving transistor based on sensed OLED characteristics, the system maintains consistent luminous current despite OLED degradation, thereby preventing brightness decrease and residual images.
2Stability of the object's composition
If the same amount of current is passed through the OLED display over time, then the display structure remains stable, but display quality deteriorates due to aging
Solution Approach 1:
The patent introduces dynamic adjustment capability to the otherwise static display structure. The driving transistor and OLED device work together in a dynamic feedback loop, continuously adapting to aging effects by adjusting drive parameters in real-time. This dynamic operation maintains display quality while the physical structure remains stable.
3Manufacturing precision
If aging compensation is applied only to display mura, then uniformity improves, but brightness decrease and residual images are not addressed
Solution Approach 1:
The patent makes the aging compensation system universal by enabling it to address multiple aging-related issues simultaneously. The same feedback mechanism and parameter adjustment approach compensate for display mura, brightness decrease, and residual images, making the system versatile enough to handle various aging effects without requiring separate compensation mechanisms for each problem.
Data Source
AI summary
An aging compensation system and an aging compensation method for an organic light emitting diode (OLED) device are disclosed, the aging compensation system for the OLED device comprises a plurality of pixel circuits, a plurality of data lines, a plurality of sense lines, a first power supply, a second power supply, and a source driving chip, the pixel circuit comprises an OLED device and a driving transistor. The number of sense lines and the number of the data lines are equal, each of the sense lines is cooperating with each of the data lines in connection with the pixel circuits, the sense line is connected to an anode of the OLED device via a first transistor; the first power supply is connected to the driving transistor, the second power supply is connected to a cathode of the OLED device; the source driving chip is connected to the data line.