Light Emitting Display Touch Screen Hole Pattern Encapsulation
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Solution Overview
Problem
In light emitting display devices with integrated touch screens, the organic encapsulation layer often overlaps the link line-routing line connection unit, leading to signal transmission defects between the touch driving element and the touch screen.
Innovation Solution
A light emitting display device design featuring a substrate with a display area and a non-display area, where the encapsulation film includes a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer stacked in order, with a hole pattern in the second planarization layer to prevent the organic encapsulation layer from reaching the link line-routing line connection unit, ensuring reliable signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the organic encapsulation layer is applied uniformly across the substrate, then manufacturing is simplified, but connection defects occur between routing line and link line
Solution Approach 1:
The uniform encapsulation process is segmented by introducing a hole pattern that creates a localized exclusion zone. This allows the majority of the substrate to receive uniform encapsulation coverage while the connection area remains free of organic encapsulation material, preventing connection defects.
Solution Approach 2:
The hole pattern is formed in the planarization layer before the organic encapsulation layer is deposited. This preliminary action defines the exclusion zone in advance, ensuring that when the organic encapsulation material is applied uniformly, it naturally excludes the connection area and prevents overlap with sensitive conductive structures.
Data Source
AI summary
A light emitting display device includes: a substrate including a display area in which a plurality of display pixels are disposed and a non-display area surrounding the display area; an encapsulation film covering the display area and the non-display area and having a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer stacked in an order; a first touch electrode disposed on the encapsulation film and extending in a first direction and a second touch electrode extending in a second direction; at least one inorganic insulating layer disposed on the substrate; a first planarization layer disposed on the inorganic insulating layer; a second planarization layer disposed on the first planarization layer; and a hole pattern formed in the second planarization layer. The hole pattern has the organic encapsulation layer therein.