OLED Display Contact Hole Protrusions Reduce Heat
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Solution Overview
Problem
The existing organic light emitting diode (OLED) displays experience heat generation due to increased resistance caused by the lifting phenomenon at the border of contact holes in barrier ribs, which affects the adherence of the common electrode with the bottom metal film and leads to heat generation.
Innovation Solution
The OLED display incorporates a substrate with protrusions made of semiconductor material, forming a common voltage contact hole and a common voltage opening in the barrier rib, increasing the contact area between the common electrode and the data common voltage line, thereby reducing contact resistance and heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the barrier rib thickness is increased to provide structural support, then the mechanical strength is improved, but the developer vaporization becomes insufficient causing lifting phenomenon at contact hole borders
Solution Approach 1:
The contact hole structure is segmented into multiple portions: the first contact hole portion extends through the barrier rib, while the second contact hole portion is formed in the common electrode. This segmentation allows the developer to effectively reach and vaporize at the contact hole border despite the thick barrier rib, preventing lifting phenomenon while maintaining structural integrity.
2Reliability
If the common electrode is passed through the contact hole to improve electrical connection, then the electrical conductivity is improved, but the adherence with bottom metal film deteriorates and heat generation increases
Solution Approach 1:
The contact hole structure transitions from a single vertical hole to a multi-dimensional structure with a first portion through the barrier rib and a second portion in the common electrode. This dimensional extension allows the common electrode to contact the bottom metal film through the extended second contact hole portion, improving electrical connection while distributing heat generation across a larger area and reducing localized thermal damage.
Data Source
AI summary
Disclosed is an organic light emitting diode display including: a pixel unit including an organic light emitting diode for displaying an image; and a periphery surrounding the pixel unit. The periphery includes a gate common voltage line formed on the substrate and receiving a common voltage from an external circuit, an interlayer insulating layer covering the gate common voltage line and including a common voltage contact hole for exposing a part of the gate common voltage line, a data common voltage line formed on the interlayer insulating layer and contacting the gate common voltage line through the common voltage contact hole, and a plurality of protrusions provided in the common voltage contact hole and formed on the substrate.