Double-Gate Pixel Circuit for Threshold Compensation and Low Crosstalk
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Solution Overview
Problem
Display devices face issues with improper threshold voltage levels in driving transistors leading to luminance errors and increased power consumption, along with horizontal crosstalk reducing image quality.
Innovation Solution
A pixel design incorporating a first transistor with a double gate structure, first and second capacitors, and additional transistors for threshold voltage compensation, where the second capacitor stores the threshold voltage in a diode connection manner, reducing power consumption by performing compensation only in specific frame periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a compensation operation is performed to compensate the threshold voltage of the driving transistor, then the luminance error is reduced, but the power consumption increases excessively
Solution Approach 1:
The patent performs threshold voltage compensation in advance during a compensation period before the actual display period. The compensation capacitor stores the compensated threshold voltage, allowing the driving transistor to operate correctly without requiring continuous compensation operations, thereby reducing power consumption while maintaining luminance accuracy
Solution Approach 2:
The patent implements compensation operations periodically during specific compensation periods rather than continuously. The compensation transistor and capacitor are activated only during these periodic intervals to store threshold voltage information, reducing overall power consumption while maintaining display quality
2Measurement precision
If the pixel configuration is designed to improve image quality, then horizontal crosstalk is reduced, but the device complexity increases
Solution Approach 1:
The patent divides the pixel circuit into functionally distinct segments: a compensation circuit portion containing the compensation transistor and capacitor for threshold voltage storage, and a display circuit portion containing the driving transistor and light emitting element. This segmentation isolates the compensation function, reducing horizontal crosstalk while managing complexity through functional separation
Solution Approach 2:
The patent extracts the threshold voltage compensation function into a separate compensation circuit portion with dedicated transistors and capacitors, removing it from the main display circuit path. This extraction prevents compensation signals from causing horizontal crosstalk in adjacent pixels while maintaining the necessary compensation functionality
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 design enhances image quality and reduces power consumption by efficiently storing and maintaining threshold voltage, minimizing horizontal crosstalk and scan signal toggling, thereby optimizing power usage.
Implementation Method 1
The first capacitor includes a first electrode connected to the first node, and a second electrode connected to the third node
Implementation Method 2
The second capacitor includes a first electrode connected to the fourth node, and a second electrode connected to the third node
Implementation Method 3
a light emitting element that emits light based on the current generated by the driving transistor
Data Source
AI summary
A pixel includes a first transistor including a first and second gates, a first capacitor connected between a first node and a third node, a second capacitor connected between a fourth node and the third node, a second transistor receiving a first scan signal and connected between a data line and the first node, a third transistor receiving a second scan signal and connected between a reference voltage line and the first node, a fourth transistor receiving a third scan signal and connected between an initialization line and the third node, a fifth transistor receiving an emission signal and connected between a first power line and the second node, a sixth transistor receiving the second scan signal and connected between the fourth node and the second node, and a light emitting element connected between the third node and a second power line.