MIP Pixel Circuit Voltage Compensation for Static Display
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Solution Overview
Problem
Current Memory-in-Pixel (MIP) display technology is limited by complex circuit structures that only support black and white static image display, restricting its application range and suffering from display effect degradation due to storage circuit leakage in static display stages.
Innovation Solution
A pixel circuit design incorporating a data write unit, voltage compensation unit, and switch units to manage liquid crystal and storage capacitors, allowing for dynamic and static display stages with improved voltage management to prevent data voltage deviation, enabling color picture display and enhanced display effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the existing MIP circuit structure is used, then the power consumption is low and the structure is simple, but the circuit structure becomes complicated and only black and white static image display is implemented
Solution Approach 1:
The pixel circuit is divided into distinct functional modules: a data writing unit with control signal terminal EN, a voltage compensation unit with control signal terminal VC, and a polarity reversal unit with control signal terminal POL. Each unit operates independently during different time periods, allowing the circuit to perform multiple functions (dynamic display, static display, voltage compensation, polarity reversal) without requiring a completely new circuit design. This modular segmentation enables color picture display and grayscale adjustment while maintaining reasonable circuit complexity.
2Reliability
If the existing MIP circuit structure is used, then the structure is simple, but display effect degradation occurs due to storage circuit leakage in static display stages
Solution Approach 1:
The voltage compensation unit performs preliminary compensation for voltage drop caused by storage capacitor leakage before the display degradation becomes apparent. During the static display stage, the voltage compensation unit is activated to compensate for voltage loss in the liquid crystal capacitor, ensuring the display effect remains stable over time. This preliminary compensation action prevents display effect degradation without requiring a completely new circuit architecture.
Solution Approach 2:
The voltage compensation unit operates based on feedback from the actual voltage state of the liquid crystal capacitor. The control signal terminal VC receives feedback information about voltage drop, and the compensation unit adjusts its output accordingly to maintain stable display performance. This feedback mechanism ensures reliable display effect while keeping the circuit structure manageable through targeted compensation rather than complete redesign.
3Productivity
If the data write unit transmits data voltage signal during dynamic display stage, then the display updates correctly, but voltage deviation occurs during static display stage
Solution Approach 1:
The circuit operates in periodic cycles alternating between dynamic display stage and static display stage. During the dynamic display stage, the data write unit transmits data voltage signals to update the display. During the static display stage, the voltage compensation unit is activated to correct voltage deviation. This periodic switching between different operational modes ensures both display update capability and voltage accuracy are maintained at appropriate times in the cycle.
Solution Approach 2:
The circuit discards the data writing function during the static display stage and recovers voltage accuracy through the voltage compensation unit. When static display is required, the data write unit is deactivated and the voltage compensation unit takes over to correct voltage deviation. This functional switching ensures that voltage accuracy is recovered and maintained during periods when display updates are not required, resolving the contradiction between productivity and measurement precision.
Data Source
AI summary
The pixel circuit and its drive method, the display panel, and the display device are provided in the present disclosure. The pixel circuit includes a data write unit, a voltage compensation unit, a first switch unit, a second switch unit, a third switch unit, a liquid crystal capacitor, and a storage capacitor. In a dynamic display stage, the first switch unit and the second switch unit are turned on for conduction; and the data write unit transmits a data voltage signal to the liquid crystal capacitor and the storage capacitor. In a static display stage, the third switch unit is turned on for conduction; the voltage compensation unit is controlled to be in conduction through first and second reference voltage signals and a potential signal of the storage capacitor; and a first voltage signal terminal transmits a first voltage signal to the liquid crystal capacitor.