OLED Display Dam Structure for Uniform Thin Film Encapsulation
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Solution Overview
Problem
The quality of thin film encapsulation layers in display apparatuses, particularly in organic light emitting diode (OLED) displays, affects the display quality and touch screen panel performance, as existing technologies struggle to maintain uniformity and prevent moisture and contaminant penetration.
Innovation Solution
A display apparatus design featuring a base substrate with a dam structure and recessed insulating layers to control the flow of organic materials, ensuring uniform formation of the thin film encapsulation layer and enhancing the quality of both the display and touch screen panel layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a thin film encapsulation layer is formed directly on the light emitting layer, then the display quality and touch screen panel quality are improved, but the organic material may overflow and the uniformity of the encapsulation layer deteriorates
Solution Approach 1:
The patent applies preliminary action by forming a dam structure before depositing the thin film encapsulation layer. The dam is created on the pixel defining layer to define a deposition region, preventing organic material overflow during the encapsulation process. This preliminary structural preparation ensures that subsequent material deposition remains contained and uniform.
Solution Approach 2:
The patent implements local quality by creating a dam structure with specific local properties (height, width, and position) that differ from the surrounding pixel defining layer. The dam has a first height on the pixel defining layer and a second height greater than the first height between power supply wires, providing localized protection against organic material overflow in critical areas while maintaining the overall encapsulation quality.
2Reliability
If power supply wires are placed in the non-display area, then electrical connection is achieved, but the dam structure complexity increases to prevent organic material interference
Solution Approach 1:
The patent applies local quality by creating different dam height profiles in different regions. The dam has a first height on the pixel defining layer and a second height greater than the first height specifically between power supply wires. This localized height increase provides enhanced protection in areas where organic material overflow could interfere with electrical connections, while maintaining simpler structures elsewhere.
Solution Approach 2:
The patent uses the dam structure as an intermediary element between the organic light emitting layer and the power supply wires. The dam, formed with the second height greater than the first height between power supply wires, acts as a protective barrier that prevents organic material from reaching and interfering with the electrical connections, thereby ensuring reliability without direct contact between organic materials and power wires.
Data Source
AI summary
A display apparatus includes: a base substrate including a display area and a non-display area adjacent to the display area; a first power supply wire in the non-display area, a first power supply voltage being applied to the first power supply wire; a second power supply wire in the non-display area and spaced apart from the first power supply wire, a second power supply voltage being applied to the second power supply wire; and a dam overlapping the first power supply wire and the second power supply wire, having a first height on the first power supply wire, and having a second height greater than the first height between the first power supply wire and the second power supply wire.