Third-Electrode Pixel Contact Structure for Stable LED Display Connection
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Solution Overview
Problem
Contact failure between a light emitting element and an anode and/or cathode occurs in the pixel contact hole region of display devices, leading to potential electrical connectivity issues.
Innovation Solution
A display device design that includes a flat upper surface of the third electrode, which directly contacts the first electrode and is electrically connected to the light emitting element, ensuring stable electrical connection and preventing contact failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the first electrode is directly exposed to form contact with the light emitting element, then electrical connection is established, but the electrode surface may be uneven leading to contact failure
Solution Approach 1:
Instead of relying solely on the upper surface of the first electrode for contact, the patent extends the third electrode along the side surface dimension. This creates an additional contact zone that can accommodate surface irregularities, allowing the light emitting element to establish reliable electrical connection through the side surface contact path even when the upper surface is uneven.
Solution Approach 2:
The third electrode acts as an intermediary structure that bridges the gap between the first electrode and the light emitting element. By extending from the side surface to the upper surface, it provides a gradual transition zone that facilitates reliable contact formation, compensating for the unevenness of the first electrode's upper surface.
Data Source
AI summary
A display device includes a base layer; a pixel circuit layer disposed on the base layer, the pixel circuit layer including a first transistor; and an insulating layer overlapping the first transistor; a first electrode disposed on the pixel circuit layer, the first electrode electrically connected to the first transistor via a contact hole of the insulating layer; a cover layer disposed on the first electrode, the cover layer overlapping at least a portion of the first electrode; a light emitting element including a first end and a second end electrically connected to the first electrode; a second electrode disposed on the light emitting element, the second electrode electrically connected to the second end of the light emitting element; and a third electrode disposed on the cover layer, the third electrode electrically contacting at least a portion of the first electrode.