Organic Light Emitting Display Recovery Driving Mechanism
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Solution Overview
Problem
Existing organic light emitting display devices face challenges in maintaining the threshold voltage of driving transistors within a compensable range as the operation time increases, leading to luminance inconsistencies and reduced durability due to limitations in threshold voltage compensation.
Innovation Solution
The implementation of a recovery driving mechanism that senses and adjusts the threshold voltage of driving transistors, applying specific voltages to maintain the threshold voltage within the compensable range, even when it deviates beyond the initial compensation limits, thereby extending the operational time and durability of the transistors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If threshold voltage compensation technology is used, then image quality is improved within a predetermined range, but compensation fails when threshold voltage exceeds specific limits
Solution Approach 1:
The patent implements a dynamic recovery driving mechanism that continuously monitors threshold voltage and adjusts driving conditions in real-time. When threshold voltage deviates from the compensable range, the system dynamically switches to recovery mode with different voltage levels and timing, enabling adaptation beyond fixed compensation limits.
Solution Approach 2:
The patent changes multiple parameters including driving voltage levels, pulse width modulation duty cycles, and recovery timing sequences. By varying these parameters based on threshold voltage status, the system extends compensation capability from a fixed range to a broader operational envelope.
2Duration of action of stationary object
If driving time increases, then display durability is tested, but threshold voltage shifts cause luminance degradation
Solution Approach 1:
The patent incorporates continuous feedback mechanisms that monitor threshold voltage drift during operation. The sensed threshold voltage information feeds back to the control logic, which adjusts recovery driving parameters to maintain luminance consistency throughout the display's operational life.
Solution Approach 2:
The patent performs preliminary recovery driving operations during idle periods or between display content changes. This preliminary action prevents threshold voltage shifts from accumulating to problematic levels, maintaining luminance consistency before degradation occurs.
3Reliability
If recovery driving is implemented, then threshold voltage is maintained within compensable range, but additional control complexity is introduced
Solution Approach 1:
The patent merges the recovery driving control functions with existing threshold voltage compensation circuits and pixel structures. By integrating multiple functions into shared circuitry, the system achieves threshold voltage stabilization without proportionally increasing overall device complexity.
Solution Approach 2:
The patent implements self-service mechanisms where the display system automatically detects and corrects its own threshold voltage issues without external intervention. The recovery driving circuitry monitors and adjusts parameters autonomously, reducing the need for additional complex external control systems.
Data Source
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AI summary
Disclosed are an organic light emitting display device and a display panel thereof, which are capable of performing a recovery driving for recovering a threshold voltage of a driving transistor (DT) to be within a range of compensation for the threshold voltage if the threshold voltage of the driving transistor (DT) deviates from the range of the compensation for the threshold voltage as a driving time of the driving transistor (DT) of a pixel increases.