Electroluminescent Display Pad Electrode Exposure Protection
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Solution Overview
Problem
Existing electroluminescent display devices face challenges in manufacturing cost reduction and preventing damage to the periphery of pad electrodes when exposing their upper surfaces for external connections.
Innovation Solution
The electroluminescent display device incorporates a substrate with a display area and a non-display area, featuring an encapsulation layer that extends from the display area to the non-display area, and a protection layer between pad electrodes to prevent damage during exposure, allowing for the exposure of pad electrodes without damaging their periphery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the upper surface of the pad electrode is externally exposed for connection, then the ease of operation is improved, but the reliability deteriorates due to damage on the periphery of the pad electrode
Solution Approach 1:
The device is divided into a display area and a non-display area, with the pad electrode located in the non-display area. This segmentation allows the pad electrode to be exposed for external connections while the display area remains protected and intact, resolving the contradiction between ease of connection and structural integrity.
Solution Approach 2:
An insulating layer is introduced as an intermediary between the pad electrode and the surrounding environment. This insulating layer protects the periphery of the pad electrode from damage while still allowing the upper surface to be exposed for external connections, thus maintaining both ease of operation and reliability.
2Ease of operation
If the pad electrode is exposed for external connections, then the ease of operation is improved, but the manufacturing precision deteriorates due to potential damage during exposure
Solution Approach 1:
The insulating layer is formed in advance before the pad electrode exposure process. This preliminary action provides pre-protection to the pad electrode periphery, ensuring that subsequent exposure and connection processes do not compromise the manufacturing precision or structural integrity of the pad electrode.
Solution Approach 2:
The insulating layer acts as a cushioning protective layer that is applied beforehand to the pad electrode structure. This prior cushioning prevents mechanical damage during the exposure and connection processes, thereby maintaining manufacturing precision while enabling ease of operation.
3Ease of operation
If the encapsulation layer is removed to expose the pad electrode, then the ease of operation is improved, but the strength of the structure deteriorates
Solution Approach 1:
The encapsulation layer is selectively removed (extracted) only from the non-display area where the pad electrode is located, while the encapsulation layer remains intact in the display area. This selective extraction allows external connections to the pad electrode while preserving the structural strength and protection of the display area.
Solution Approach 2:
The encapsulation layer is differentiated by location: it is removed in the non-display area to enable connections, but retained in the display area to maintain structural strength. This local quality approach ensures that ease of operation is improved where needed without compromising the overall structural integrity of the device.
Data Source
AI summary
Disclosed is an electroluminescent display device comprising an a substrate including a display area and a non-display area, an emission device in the display area on the substrate, an encapsulation layer extending from the display area to the non-display area, wherein the encapsulation layer is provided on the emission device, a plurality of pad electrodes in the non-display area on the substrate, and a protection layer provided in the area between each of the plurality of pad electrodes, and configured to protect an insulating layer disposed there below, wherein the encapsulation layer is provided with an opening area configured to expose at least a portion in each of the plurality of pad electrodes and at least a portion of the protection layer.