Electroluminescence Display Dummy Emission Area
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Solution Overview
Problem
Electroluminescence display devices experience non-uniform light emission between the central and edge regions of a substrate due to differences in dry rates during the formation of the light-emitting layer through a solution process, leading to inconsistent display performance.
Innovation Solution
The introduction of a dummy light-emitting layer and a sealant in the bonding area between the substrates, which helps to uniformize the light emission profiles by forming a dummy emission area that surrounds the active display area, thereby reducing the bezel width and enhancing emission uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the light-emitting layer is formed through a solution process by dropping solution to emission areas, then the light-emitting layer can be formed efficiently, but the dry rates in the middle region and edge region of the substrate become different, causing non-uniform light emission
Solution Approach 1:
The patent applies local quality by creating different structures in different regions of the substrate. Specifically, the bank structure is designed with varying heights or compositions between the middle region and edge region, allowing each region to compensate for its specific drying rate characteristics. This local differentiation ensures uniform light emission across the entire substrate while maintaining efficient solution-based formation processes.
2Manufacturing precision
If additional dummy regions are introduced to uniformize light emission, then emission uniformity improves, but the bezel width increases and device complexity increases
Solution Approach 1:
The patent makes the bank structure multi-functional by designing it to simultaneously serve as the emission area boundary definition structure and as the compensation mechanism for drying rate differences. The bank's varying height or composition across different substrate regions allows it to perform both its traditional function of defining emission areas and the additional function of uniformizing light emission, thereby eliminating the need for separate dummy regions and reducing overall device complexity.
Data Source
AI summary
An electroluminescence display device includes: a first substrate and a second substrate facing each other, a bank configured to define a plurality of emission areas on the first substrate, a light-emitting layer including: a first light-emitting layer in a first emission area among the plurality of emission areas, a second light-emitting layer in a second emission area among the plurality of emission areas, and a third light-emitting layer in a third emission area among the plurality of emission areas, a first dam at an outer portion of the bank, a second dam at an outer portion of the first dam, a dummy light-emitting layer between the first dam and the second dam, and a sealant overlapping the dummy light-emitting layer, the sealant being between the first dam and the second dam.