Pixel Circuit With Body Electrode for Stable High-Resolution Luminance
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Solution Overview
Problem
Existing display technologies face challenges in achieving high-resolution panels due to variations in threshold voltage of driving transistors, leading to inconsistent luminance.
Innovation Solution
A pixel design incorporating a MOSFET with a body electrode and capacitive coupling to stabilize threshold voltage, allowing for stable data signal transfer and wide voltage range, utilizing a complex transistor network to control light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional pixel design is used, then the device complexity is low, but the luminance consistency deteriorates due to threshold voltage variations
Solution Approach 1:
The pixel circuit is divided into multiple functional blocks: a driving transistor for current control, a first transistor for data signal input, a second transistor for initialization, and a third transistor for emission control. This segmentation allows each transistor to be optimized for its specific function, improving overall luminance consistency while managing complexity through modular design.
Solution Approach 2:
A initialization circuit including a second transistor is implemented to pre-set the voltage level at the gate of the driving transistor before data signal input. This preliminary action compensates for threshold voltage variations by establishing a known reference state, ensuring consistent luminance output across different pixels and operating conditions.
Solution Approach 3:
The pixel circuit incorporates feedback mechanisms where the driving transistor's gate voltage is controlled based on the luminance output requirement. The emission control transistor monitors the operational state and adjusts the driving current accordingly, creating a feedback loop that maintains luminance consistency despite variations in transistor threshold voltages.
2Measurement precision
If the resolution is increased for high-resolution panels, then the measurement precision is improved, but the area of each pixel is reduced
Solution Approach 1:
Multiple functional elements are merged into a compact integrated pixel circuit design. The driving transistor, data input transistor, initialization transistor, and emission control transistor are combined in a shared pixel structure with共用 power lines and signal lines, reducing the total area required per pixel while maintaining high-resolution performance.
Solution Approach 2:
The pixel circuit design uses universal transistor structures and shared power supply lines that can be applied across different resolution configurations. The same basic circuit topology serves multiple functions: data input, threshold voltage compensation, current driving, and emission control, making the design scalable for high-resolution panels without requiring proportionally larger pixel areas.
Data Source
AI summary
According to embodiments of the disclosure, a pixel includes a driving transistor including a gate electrode, a first electrode electrically connected to a first power line and a second electrode electrically connected to a light emitting element, a body of a semiconductive layer constituting the driving transistor being electrically connected to the first power line.