AMOLED Pixel Structure Short-Circuit-Ring Electrostatic Protection
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Solution Overview
Problem
Conventional active matrix organic light emitting display (AMOLED) pixel structures are prone to electrostatic breakdown due to charge concentration on signal lines, leading to short circuits.
Innovation Solution
Incorporation of a short-circuit-ring structure between the common electrode line and the signal line, which communicates large currents from the signal line to the common electrode line via sequentially turned-on thin film transistors, preventing electrostatic breakdown and protecting the signal line and thin film transistors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional pixel structure is used without additional protective structures, then the device complexity is low, but electrostatic breakdown occurs due to charge concentration on signal lines
Solution Approach 1:
A short-circuit-ring structure is introduced as an intermediary protective element between the signal line and common electrode line. This ring structure includes a thin film transistor that acts as a mediator to detect and respond to electrostatic breakdown conditions, diverting excessive charges away from vulnerable components before damage occurs.
Solution Approach 2:
The short-circuit-ring structure is pre-configured in the pixel structure before operation. The thin film transistor within the ring is positioned and biased to be ready to activate immediately when electrostatic breakdown conditions arise, preventing damage before it occurs rather than responding after failure.
2Reliability
If the short-circuit-ring structure is added to prevent electrostatic breakdown, then the reliability improves, but the manufacturing process becomes more complex
Solution Approach 1:
The short-circuit-ring structure is merged with the existing pixel structure by integrating its thin film transistor with the pixel's drive transistor. The ring shares common electrodes and conductive layers with the pixel structure, allowing both protective and display functions to be achieved through combined structures rather than completely separate components.
Data Source
AI summary
An embodiment of the invention provides a pixel structure of an active matrix organic light emitting display comprising a gate line, a common electrode line, a signal line, a power line, a first thin film transistor which is used as an addressing element, and a second thin film transistor which controls the organic light emitting display. A short-circuit-ring structure is connected between the common electrode line and the signal line and the short-circuit-ring structure communicates the signal line and the common electrode line in the case where a large current flows.