Alternating Pixel Detection for OLED Threshold Compensation
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Solution Overview
Problem
Current display devices face challenges in effectively compensating for threshold voltage drift in pixel driving transistors, particularly at high refresh rates and large dimensions, leading to poor panel evenness due to limited detection time during blank periods.
Innovation Solution
A display device with a control module that alternates between driving subpixels to emit light and detect threshold voltages in odd and even display frames, allowing for sufficient detection time and energy-saving mode operation, enabling immediate detection and improved compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If threshold voltage detection is performed during blank time between display frames, then detection can be completed, but detection time is insufficient leading to poor compensation effect
Solution Approach 1:
The display device divides the display area into first pixel units and second pixel units that alternate along a first direction. Different pixel units are driven by different pixel driving circuits, allowing sequential operation modes where some circuits drive subpixels while others perform threshold voltage detection, effectively segmenting the detection and display tasks across spatial and temporal domains
Solution Approach 2:
The system performs threshold voltage detection in advance during display frames rather than waiting for blank time. By detecting threshold voltages of pixel driving circuits that will be used in subsequent display frames, the system prepares compensation data beforehand, enabling immediate compensation action and improving response speed
2Illumination intensity
If all pixel driving circuits drive subpixels to emit light continuously, then display quality is maintained, but energy consumption increases
Solution Approach 1:
The pixel driving circuits operate in periodic alternation between two modes: driving mode where circuits drive subpixels to emit light for display, and detection mode where circuits perform threshold voltage detection. This periodic switching allows the system to maintain display quality during active periods while performing necessary detection and compensation during dedicated periods, optimizing energy efficiency
Solution Approach 2:
The system dynamically switches the function of pixel driving circuits based on operational requirements. Control signals dynamically adjust whether circuits are driving subpixels or performing detection, allowing flexible resource allocation that optimizes both display quality and energy consumption according to real-time needs
3Stability of the object's composition
If detection is delayed until blank time, then current display frame is not affected, but follow-up compensation effect is poor
Solution Approach 1:
The system performs threshold voltage detection in advance during display frames before the next display frame begins. By detecting threshold voltages of pixel driving circuits that will be used in subsequent display frames, the system prepares compensation data beforehand, enabling immediate compensation action and improving response speed
Solution Approach 2:
The detection operation continues throughout the display frame period rather than being confined to blank time. By seamlessly integrating detection into the display frame timeline using alternating pixel units, the system maintains continuous useful action without disrupting display output, ensuring compensation is always ready for the next frame
Data Source
AI summary
A display device and a terminal are provided. The display device includes first pixel units and second pixel units arranged alternately along a first direction. In an energy saving mode, a control module is used for controlling one of the first pixel units and the second pixel units to emit light in a current display frame, for controlling another one to detect a threshold voltage of driving units of pixel driving circuits, and for controlling pixel units emitting light and pixel units for detecting to swap with each other. Energy consumption can be lowered, and detection time is sufficient.