Pixel Circuit Layout With Well Supply Shielding Against Coupling
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Solution Overview
Problem
In display devices driven by an active matrix system, parasitic capacitance between adjacent pixel circuits can cause coupling, leading to reduced display quality and desired emission luminance, especially in compact organic EL display devices where pixel circuit spacing is minimized.
Innovation Solution
The introduction of an electricity supply region acting as an active area between adjacent pixel circuits in the diffusion layer, which serves as a shield to suppress interference and coupling between pixel circuits, thereby allowing each pixel circuit to operate independently and maintain desired luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the distance between adjacent pixel circuits is reduced to make the display device smaller, then the size of the display device is reduced, but the coupling between adjacent pixel circuits increases due to parasitic capacitance
Solution Approach 1:
An electricity supply region is introduced as an intermediary structure between adjacent pixel circuits. This region is configured to supply electricity to wells in both adjacent pixel circuits, acting as a mediator that prevents direct capacitive coupling between the pixel circuits while maintaining their electrical functionality.
Solution Approach 2:
The diffusion layer is segmented into distinct functional regions: pixel circuit regions and electricity supply regions. By separating the electricity supply function from the pixel circuit operation regions, the patent reduces parasitic capacitance coupling while maintaining compact spacing between pixel circuits.
2Volume of moving object
If the distance between adjacent pixel circuits is reduced, then the display device becomes more compact, but display quality deteriorates due to increased parasitic capacitance coupling
Solution Approach 1:
The electricity supply region serves as an intermediary that electrically isolates adjacent pixel circuits while maintaining compact spacing. This mediator structure prevents parasitic capacitance from degrading display quality, enabling high-resolution compact displays.
Solution Approach 2:
The patent applies different functional qualities to different regions: pixel circuits are optimized for light emission control, while electricity supply regions are optimized for electrical isolation and power distribution. This local differentiation maintains display quality in compact configurations.
3Reliability
If an electricity supply region is added between pixel circuits to suppress coupling, then parasitic capacitance influence is reduced, but the device complexity increases
Solution Approach 1:
The electricity supply region performs multiple functions simultaneously: it supplies electricity to wells in adjacent pixel circuits, acts as an electrical isolator to reduce parasitic capacitance, and maintains the compact spacing between pixel circuits. This multi-functionality reduces overall device complexity.
Solution Approach 2:
The patent merges the electricity supply function with the isolation function into a single integrated region. Rather than adding separate isolation structures and power supply structures, the electricity supply region combines both functions, simplifying the overall device architecture.
Data Source
AI summary
Provided is a display device including: a pixel unit in which a plurality of pixel circuits (PIX_A, PIX_B, PIX_C) each of which includes a light emitting element and a driving circuit configured to drive the light emitting element are arranged in a matrix form. In a diffusion layer in which transistors included in the driving circuits of the pixel circuits (PIX_A, PIX_B, PIX_C) are formed, an electricity supply region (223) that is an active area for supplying an electric potential to a well is provided between mutually adjacent ones of the pixel circuits (PIX_A, PIX_B, PIX_C).