OLED Pixel Circuit Luminance Compensation via Feedback
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Solution Overview
Problem
The operating temperature and aging of transistors in OLED pixel circuits can deviate the light emitting luminance from a predetermined value, degrading display image quality and user experience.
Innovation Solution
A pixel circuit comprising a light emitting element, a driving circuit, a luminance detection circuit, a voltage comparison circuit, and a compensation control circuit that adjusts the current to the light emitting element based on detected luminance to maintain target luminance, using a compensation voltage calculated by comparing photosensitive voltage with a reference voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If transistor operating temperature and aging are not compensated, then device complexity remains low, but light emitting luminance deviates from predetermined value degrading display quality
Solution Approach 1:
The patent implements a feedback mechanism where the luminance detection circuit continuously monitors the actual luminance output of the light emitting element and feeds this information back to the compensation control circuit. The compensation control circuit then adjusts the driving current accordingly to maintain the predetermined luminance value, resolving the contradiction by automatically compensating for temperature and aging effects without requiring complex manual calibration
Solution Approach 2:
The pixel circuit performs self-compensation for luminance deviation through integrated detection and control circuits. The system uses its own output luminance as the basis for generating compensation signals, enabling the circuit to automatically correct its own performance degradation due to temperature and aging without external intervention, thus maintaining precision while managing complexity
2Reliability
If real-time luminance compensation is implemented, then display quality improves, but device complexity increases due to additional circuits
Solution Approach 1:
The patent merges the luminance detection function and compensation control function directly into the pixel circuit structure. By integrating these functions at the pixel level rather than adding separate external circuits, the system achieves real-time luminance compensation and improved display quality while minimizing the increase in overall device complexity through functional consolidation
Solution Approach 2:
The compensation control circuit is designed to handle multiple functions including temperature compensation, aging compensation, and luminance regulation through a single integrated structure. This multi-functional approach allows the circuit to maintain reliable display quality across varying conditions without requiring separate dedicated circuits for each compensation type, thereby controlling complexity
3Manufacturing precision
If luminance detection and compensation circuits are added, then manufacturing precision improves, but ease of manufacture decreases
Solution Approach 1:
The patent implements luminance compensation at the local pixel level rather than requiring global system-wide compensation circuits. Each pixel circuit independently performs detection and compensation for its own light emitting element, allowing for precise local control of luminance while using standardized fabrication processes for the integrated circuits, thus balancing manufacturing precision with ease of manufacture
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution ensures the light emitting luminance is adjusted in real-time to match the target value, preventing deviations and improving display quality by providing a compensation voltage to the driving circuit.
Implementation Method 1
the luminance detection circuit is configured to detect luminance of the light emitting element and obtain a photosensitive voltage corresponding to the luminance of the light emitting element according to the luminance of the light emitting element
Data Source
AI summary
A pixel circuit and a driving method thereof, a display panel and a display device. The pixel circuit includes a light emitting element, a driving circuit and a compensation voltage acquisition circuit. The driving circuit is configured to drive the light emitting element to emit light; and the compensation voltage acquisition circuit is configured to obtain a compensation voltage based on luminance of the light emitting element, and the compensation voltage can be provided to the driving circuit.