OLED Spacer Design for Via Hole Coverage and Light Reflection Control
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Solution Overview
Problem
Current OLED displays face challenges in maintaining display characteristics due to external impacts and external light reflection, which can degrade their performance and manufacturing efficiency.
Innovation Solution
The use of spacers formed on non-pixel areas between the display substrate and encapsulation substrate to cover via holes, maintaining a gap and reducing external light reflection, while also improving the aperture ratio and deposition reliability through specific pixel arrangements and shapes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If via holes are formed in the non-pixel area for electrical connection, then electrical connectivity is improved, but external light reflection increases and display characteristics degrade
Solution Approach 1:
A spacer structure is introduced as an intermediary element that covers the via holes in the non-pixel area. The spacer acts as a mediator that maintains electrical connectivity through the via holes while simultaneously blocking external light from reflecting off the via hole surfaces, thus resolving the contradiction between electrical connectivity and light reflection prevention
2Length of moving object
If the gap between display substrate and encapsulation substrate is reduced for thinner display, then device thickness is improved, but robustness against external impacts deteriorates
Solution Approach 1:
The spacer is designed with a segmented structure featuring a first portion and a second portion at different heights. This segmentation allows the spacer to provide mechanical support and impact resistance at multiple levels while maintaining an overall reduced gap thickness, thus achieving both thinness and robustness
3Reliability
If spacers are added to cover via holes and maintain gap, then robustness and anti-reflection are improved, but device complexity increases
Solution Approach 1:
The spacer is designed as a multi-functional element that simultaneously performs multiple roles: covering via holes to prevent light reflection, maintaining the gap between substrates for impact protection, providing mechanical support, and ensuring proper spacing for deposition processes. This multi-functionality reduces the need for separate components, thereby managing device complexity while achieving multiple benefits
Data Source
AI summary
An organic light-emitting diode (OLED) display is disclosed. In one aspect, the OLED display comprises a display substrate, an encapsulation substrate, and at least one spacer. The display substrate includes a non-pixel area, wherein a plurality of via holes is formed in the non-pixel area. The encapsulation substrate is formed over the display substrate. The spacer is formed between the display substrate and the encapsulation substrate so as to maintain a gap therebetween, wherein the spacer at least partially covers at least one of a plurality of via holes.