Pixel Circuit Merging Threshold and Mobility Corrections
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Solution Overview
Problem
Existing pixel circuits face inefficiencies in current consumption, uniformity of sub-pixels, and data range limitations, with no effective reset mechanism and separate durations for threshold and mobility corrections, leading to longer operation cycles and reduced performance.
Innovation Solution
A pixel circuit design incorporating four transistors and two capacitors, with a fixed power voltage and integrated reset mechanism, allowing for simultaneous threshold and mobility corrections during the data write and correction duration, reducing current consumption and operation cycle while enhancing data range and resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate durations are used for threshold correction and mobility correction, then correction accuracy is improved, but operation cycle duration increases
Solution Approach 1:
The patent merges the threshold correction operation and mobility correction operation into a single integrated operation duration. The pixel circuit performs both corrections simultaneously during the data write phase by utilizing the body effect of transistors, thereby reducing the total operation cycle while maintaining correction accuracy through coordinated voltage control signals.
Solution Approach 2:
The patent implements continuous correction throughout the data write duration by maintaining active correction circuits that continuously adjust threshold voltages and compensate for mobility variations. This continuous action ensures both corrections are completed within the same time window without requiring separate discrete phases.
2Productivity
If integrated reset mechanism is implemented, then operation efficiency is improved, but circuit complexity increases
Solution Approach 1:
The reset mechanism in the patent serves multiple functions simultaneously: it resets the pixel circuit state, initiates the correction operations, and prepares the circuit for data writing. This multi-functional design consolidates what could be separate operations into a single integrated mechanism, improving efficiency without proportionally increasing complexity.
Solution Approach 2:
The reset mechanism performs preliminary preparation of the circuit state before data writing begins, pre-configuring the necessary voltage levels and transistor states. This preliminary action ensures that subsequent correction and data write operations can proceed without additional setup time, enhancing overall operation efficiency.
3Duration of action of moving object
If simultaneous threshold and mobility corrections are performed, then operation cycle is shortened, but current consumption increases
Solution Approach 1:
The patent employs periodic switching of correction circuits during the data write duration, activating correction operations in alternating intervals rather than continuously. This periodic action maintains correction effectiveness while reducing average current consumption compared to continuous simultaneous correction.
Solution Approach 2:
The correction circuit operates dynamically by adjusting its activity level based on real-time circuit state monitoring. When correction is needed, the circuit activates; when the pixel is already in the desired state, the circuit remains inactive. This dynamic operation shortens the effective correction time while minimizing unnecessary current draw.
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
The solution achieves reduced current consumption, shorter operation cycles, higher resolution, and frame rates by utilizing body-effect features for threshold and mobility corrections within the same duration, improving pixel circuit efficiency and performance.
Implementation Method 1
utilizing body-effect features for threshold and mobility corrections within the same duration
Data Source
AI summary
A pixel circuit includes a first transistor, a second transistor, a first capacitor, a third transistor, a second capacitor, and a fourth transistor. The first transistor is configured to receive a power voltage. The second transistor is configured to receive a data voltage and is coupled to a gate terminal of the first transistor. The first capacitor is coupled between the gate terminal of the first transistor and a source terminal of the first transistor. The third transistor is coupled between the source terminal of the first transistor and a light-emitting element. The second capacitor is coupled between the source terminal of the first transistor and a reference voltage. The fourth transistor is coupled between the source terminal of the first transistor and a reset voltage.