Electroluminescent Display Bezel Structure for Reflection Suppression
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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 to improve adhesiveness and reduce light reflection, and the use of intermediate layers to maintain uniform top surface heights and enhance 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 light reflection becomes visible at specific viewing angles
Solution Approach 1:
A black matrix layer is introduced as an intermediary between the multi-layer wiring lines and the viewer. This black matrix extends from the emission region into the bezel region to cover the wiring lines on multiple layers, preventing light reflection while allowing the wiring lines to maintain their multi-layer configuration for high resolution data transmission.
2Productivity
If wiring lines are disposed on multiple layers, then more data lines can be accommodated, but steps are generated above the wiring lines
Solution Approach 1:
The black matrix structure is extracted and extended into the bezel region specifically to address the surface flatness issue. By protruding into the bezel region, the black matrix creates a uniform top surface that masks the steps generated by multi-layer wiring lines, while the wiring lines themselves remain in their multi-layer configuration to maintain data line capacity.
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.