Narrow Bezel Electroluminescent Lighting Device Routing
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Solution Overview
Problem
Organic light emitting elements in lighting devices face challenges with moisture and oxygen penetration, leading to reduced luminescence efficiency and non-uniform brightness due to conventional routing line structures.
Innovation Solution
The electroluminescent lighting device employs a narrow bezel structure with the back surface of the cover film acting as the routing line, minimizing resistance and maximizing emission area, and features a flexible circuit board with terminals on both the substrate and cover film for uniform voltage distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional routing line structure is used, then the structure is simple to manufacture, but the brightness uniformity is poor and emission area is reduced
Solution Approach 1:
The routing line is moved from the planar surface to the back surface of the cover film, utilizing the third dimension (depth/thickness) to resolve the conflict between brightness uniformity and structural simplicity. This allows the routing line to be positioned where it does not interfere with the emission area while maintaining manufacturing feasibility.
Solution Approach 2:
Instead of placing the routing line on the front surface as conventionally done, the patent inverts the approach by placing it on the back surface of the cover film. This inversion eliminates the blocking effect on light emission and improves brightness uniformity across the display area.
2Area of stationary object
If routing line is placed on the front surface, then the structure is simple, but the emission area is reduced due to bezel width
Solution Approach 1:
The routing line is relocated to the back surface of the cover film, utilizing the z-dimension (thickness direction) to separate the routing function from the light emission plane. This enables the emission area to extend to the edges of the substrate while the routing line remains accessible on the back surface.
Solution Approach 2:
The cover film serves dual functions: as a protective enclosure and as a carrier for the routing line on its back surface. This thin film structure allows the routing line to be integrated without adding significant thickness or complexity to the overall device.
3Area of stationary object
If narrow bezel structure is implemented, then the emission area is maximized, but the routing line width must be minimized
Solution Approach 1:
By moving the routing line to the back surface, the patent eliminates the need to reduce routing line width to achieve narrow bezel. The routing line can maintain sufficient width for electrical performance while the emission area is maximized on the front surface.
Solution Approach 2:
The routing line function is extracted from the front surface assembly and placed on the back surface of the cover film. This separation allows the emission area to be maximized without being constrained by the width requirements of the routing line.
4Ease of manufacture
If organic light emitting element is used, then the device can be manufactured with advantages of organic LEDs, but the element is vulnerable to moisture and oxygen penetration
Solution Approach 1:
The patent employs a composite encapsulation structure consisting of the cover film, encapsulation layer, and adhesive layer. This multi-material composite provides enhanced barrier properties against moisture and oxygen while maintaining the manufacturing advantages of organic LED technology.
Solution Approach 2:
The cover film acts as a flexible protective shell that encapsulates the organic light emitting element. This thin film structure provides environmental protection while allowing the device to maintain the thin-profile and manufacturing benefits of organic LED technology.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances brightness uniformity and increases the emission area while maintaining flexibility, effectively protecting the organic light emitting elements from environmental factors.
Implementation Method 1
an organic light emitting element... an electroluminescent lighting device
Data Source
AI summary
An electroluminescent lighting device comprises a substrate including an emission area and a non-emission area surrounding the emission area; an auxiliary line disposed at the emission area and defining a pixel area; a lower pad extended from the auxiliary line and disposed at one side of the non-emission area; an anode layer covering the auxiliary line and the lower pad; an emission layer disposed on the anode layer in the emission area; a cathode layer disposed on the emission layer; a second pad extended from the cathode layer and disposed at another side of the non-emission area; an encapsulation layer covering the emission area on the cathode layer; a cover film attached on the encapsulation layer and having a first pad corresponding to the lower pad; and a conductive adhesive electrically connecting the first pad and the lower pad.