Electroluminescent Display Bezel Wiring Layout for Light Reflection Control
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Solution Overview
Problem
Electroluminescent display devices face issues with light reflection in non-display areas, particularly noticeable at specific viewing angles, due to the step generated by wiring lines on multiple layers, which affects reliability and visibility.
Innovation Solution
The implementation of a double-layered organic material configuration in the non-display area to offset the step or curvature of metal layers, combined with a lattice structure for the upper metal layer, enhances light suppression and adhesiveness, reducing light reflection and improving durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wiring lines are disposed on multiple layers to accommodate high resolution, then the number of data lines increases, but steps are generated above the wiring lines causing light reflection
Solution Approach 1:
The patent introduces an additional spatial dimension by stacking metal layers vertically above the wiring lines. Multiple signal lines are disposed on different layers (first signal line on first layer, second signal line on second layer), transforming the planar wiring problem into a three-dimensional structure. This allows accommodation of more data lines while managing the step problem through vertical arrangement.
Solution Approach 2:
The patent introduces an intermediate layer between the first metal layer and the second metal layer. This intermediate layer acts as a mediator that fills the step formed by the vertically stacked signal lines, creating a planar surface that prevents light reflection from the non-display area while maintaining the multi-layer signal line structure.
2Reliability
If metal layers are stacked to offset steps, then light reflection is suppressed, but layer complexity increases
Solution Approach 1:
The intermediate layer serves as a mediating structure between the first and second metal layers. It fills the step formed by the vertically stacked signal lines and provides a planar surface, thereby suppressing light reflection. The intermediate layer is configured to be in contact with both metal layers, creating a stable three-layer structure that manages complexity while achieving the light reflection suppression goal.
3Productivity
If signal lines are disposed on different layers, then more signal lines can be accommodated, but manufacturing precision requirements increase
Solution Approach 1:
The patent transitions from two-dimensional planar wiring to three-dimensional stacked wiring by disposing signal lines on different vertical layers. The first signal line is disposed on a first layer and the second signal line on a second layer, enabling higher signal line capacity. The intermediate layer provides a reference plane that facilitates precise alignment during manufacturing.
Solution Approach 2:
The intermediate layer acts as a manufacturing reference and alignment aid between the first and second metal layers. By providing a stable intermediate plane that contacts both metal layers, it establishes precise spatial relationships that guide the manufacturing process, thereby managing the precision requirements of multi-layer fabrication.
Data Source
AI summary
An electroluminescent display device includes a substrate having an emission region and a bezel region, a bank layer that extends from the emission region to the bezel region, a plurality of signal lines which are disposed on different layers on the substrate, a first metal layer that overlaps the plurality of signal lines and has a step, a second metal layer that is disposed on the first metal layer, and an intermediate layer between the first and second metal layer. A step or curvature above the first electrode may be offset by the first intermediate layer so that incident from the outside is inwardly reflected. Therefore, a failure that a user at the outside recognizes the reflected light may be solved.