OLED Light Emitting Panel Touch Sensing Layer Encapsulation
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Solution Overview
Problem
Conventional techniques for touch control in OLEDs cause damage to the cathode or luminescent layer, reducing luminous efficiency due to the complexity of manufacturing and improper placement of touch sensing layers.
Innovation Solution
A light emitting panel design featuring a substrate with pixel definition layers and light emitting units, covered by inorganic and organic encapsulation layers, touch sensing layers, and an insulating layer, where the second inorganic encapsulation layer is composed of silicon nitrogen or silicon oxynitride compounds, and the touch sensing layers are positioned closer to the luminescent layer to avoid damage and improve efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the touch sensing layer is directly disposed on the organic encapsulation layer to simplify manufacturing, then the manufacturing complexity is reduced, but the cathode or luminescent layer of OLED is damaged and luminous efficiency decreases
Solution Approach 1:
An inorganic encapsulation layer is introduced as an intermediary between the organic encapsulation layer and the touch sensing layer. This inorganic layer serves as a protective barrier that prevents direct contact between the touch sensing layer and the OLED's cathode or luminescent layer, thereby avoiding damage while maintaining the simplified manufacturing approach.
Solution Approach 2:
The encapsulation structure is segmented into multiple layers: an organic encapsulation layer and an inorganic encapsulation layer. This segmentation allows the inorganic layer to specifically protect the OLED components from the touch sensing layer, resolving the contradiction between simplified manufacturing and device reliability.
2Ease of manufacture
If the touch sensing layer is disposed far from the luminescent layer, then the manufacturing process is simplified, but the line width of conductive electrodes is reduced and luminous efficiency decreases
Solution Approach 1:
The inorganic encapsulation layer acts as an intermediary that enables the touch sensing layer to be positioned closer to the luminescent layer without causing damage. This intermediary structure allows for improved luminous efficiency through better electrode contact while maintaining manufacturing simplicity.
Data Source
AI summary
The present invention provides a light emitting panel and a display device. The light emitting panel includes: pixel definition layers and light emitting units arranged on a substrate and spaced apart from each other; a first inorganic encapsulation layer covering the pixel definition layers and the light emitting units; an organic encapsulation layer arranged on the first inorganic encapsulation layer and provided with concave structures arranged corresponding to the pixel definition layers; a second inorganic encapsulation layer covering the organic encapsulation layer; first touch sensing layers positioned on the second inorganic encapsulation layer and arranged corresponding to the pixel definition layers; an insulating layer covering the second inorganic encapsulation layer and the first touch sensing layers; and second touch sensing layers positioned on the insulating layer and arranged corresponding to the pixel definition layers.