Pixel Circuit Layout With Overlapping Scan Lines for Stable OLED Display
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Solution Overview
Problem
Existing electro-optical devices face challenges in achieving higher density wiring and smaller display sizes with higher definition, as conventional control line configurations restrict space and lead to potential fluctuations that affect display quality.
Innovation Solution
The electro-optical device incorporates a scanning line and data line with pixel circuits where the scanning line overlaps the gate of the drive transistor, allowing for a narrower pitch and higher density wiring, and includes a scanning line drive circuit that manages potential changes to prevent fluctuations, ensuring consistent light emission and display integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If control lines are wired to intersect the gate of the drive transistor, then wiring density is improved and pitch is reduced, but potential fluctuations from control lines affect the gate and deteriorate display integrity
Solution Approach 1:
A potential control circuit is introduced as an intermediary between the control line and the gate of the drive transistor. This mediator monitors the potential of the control line and adjusts the gate potential to compensate for fluctuations, thereby maintaining display integrity while allowing the control line to overlap with the gate for higher wiring density
2Area of stationary object
If scanning lines are wired to overlap the gate of the drive transistor, then space restrictions are relaxed and wiring density is improved, but potential fluctuations affect the gate and may deteriorate display quality
Solution Approach 1:
The potential control circuit serves as a mediator that detects potential fluctuations from the scanning line and compensates by adjusting the gate potential, enabling the scanning line to overlap the gate for relaxed space restrictions while maintaining display quality
Solution Approach 2:
The potential control circuit implements feedback control by continuously monitoring the gate potential and adjusting it in response to fluctuations caused by scanning line switching, thereby maintaining stable display performance despite the overlapping wiring configuration
Data Source
AI summary
An electro-optical device includes one or more control lines that include a scanning line, a data line and a pixel circuit. The pixel circuit has a drive transistor, a write-in transistor with a gate which is electrically connected to the scanning line, a light-emitting element that emits light at a brightness that depends on the size of a current that is supplied through the drive transistor, and a control line which overlaps the gate of the drive transistor when viewed from a direction that is perpendicular to a surface of a substrate on which the pixel circuit is formed is included in the one or more control lines.