Pixel Circuit Common Diffusion Layer Leakage Reduction
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Solution Overview
Problem
In miniaturized pixel circuits of electro-optical devices, precise control of current to light-emitting elements is challenging due to significant changes in current with slight voltage variations and reduced capacitance, leading to instability in luminance emission.
Innovation Solution
A pixel circuit configuration on a semiconductor substrate, including a driving transistor, a writing transistor, a threshold compensation transistor, and a light-emitting element, where the source and drain of the writing and threshold compensation transistors are formed by a common diffusion layer, reducing leakage current and maintaining accurate voltage between the gate and source, and additional transistors for initialization and light-emitting control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the pixel circuit is miniaturized to reduce display size and increase high definition, then the display size is reduced and resolution is improved, but the capacitance for holding voltage is reduced causing inability to maintain gate-source voltage
Solution Approach 1:
The source and drain of the writing transistor and threshold compensation transistor are merged into a common diffusion layer, reducing the total area of the pixel circuit while maintaining the voltage holding capability through shared structural elements
2Area of moving object
If the pixel circuit is miniaturized, then the display size is reduced, but the current supplied to the light-emitting element changes greatly with slight voltage changes
Solution Approach 1:
A storage capacitor is introduced to hold the gate-source voltage of the driving transistor, providing feedback stabilization that prevents current fluctuations due to slight voltage changes, thereby maintaining precise current control in miniaturized circuits
3Area of moving object
If the pixel circuit is miniaturized, then the display size is reduced, but leakage current increases causing display quality deterioration
Solution Approach 1:
The writing transistor and threshold compensation transistor share a common diffusion layer for source and drain, which reduces the total perimeter and area where leakage can occur, thereby reducing leakage current in the miniaturized pixel circuit
Data Source
AI summary
An electro-optical device formed on a semiconductor substrate, includes: a first transistor controlling a current level according to a voltage between a gate and a source; a second transistor electrically connected between a data line and the gate of the first transistor; a third transistor electrically connected between the gate and a drain of the first transistor; and a light-emitting element emitting light at a luminance according to the current level, in which one of a source and a drain of the second transistor and one of a source and a drain of the third transistor are formed by a common diffusion layer.