Electroluminescent Display Rounded Corner Curvature
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Solution Overview
Problem
Existing electroluminescent display devices face issues with non-uniform light emission due to the emission layer not spreading evenly to the corners of the emission areas, leading to deteriorated picture quality.
Innovation Solution
The electroluminescent display device features emission areas with rounded corners and varying radius curvatures, allowing the emission layers to spread uniformly across the areas, ensuring consistent light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the emission layer is formed in a quadrangle emission area by solution process, then the manufacturing process is simple, but the emission layer does not spread to corner portions leading to non-uniform light emission
Solution Approach 1:
The patent applies curvature by rounding the corner portions of the emission area. Instead of using sharp corners in the quadrangle structure, the corner portions are formed with curved surfaces having specific radius of curvature (R1, R2, R3). This curvature modification enables the emission layer to spread uniformly to all areas including corner portions during the solution process, while maintaining the overall quadrangle emission area structure for manufacturing simplicity.
2Ease of manufacture
If the emission layer is formed by solution process, then the manufacturing cost is reduced, but the emission layer does not spread evenly to corner portions deteriorating picture quality
Solution Approach 1:
The curvature of corner portions with specific radius values (R1, R2, R3) enables the emission layer to spread uniformly during the solution process, eliminating the picture quality deterioration caused by non-uniform emission at corner portions while maintaining the cost-effective solution process manufacturing method.
Solution Approach 2:
The patent modifies the geometric parameters of the emission area by introducing curved corner portions with controlled radius of curvature. This parameter change in the emission area structure enables uniform emission layer formation through the solution process, improving picture quality without increasing manufacturing complexity or cost.
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 design ensures uniform light emission across all areas, including corners and centers, thereby enhancing the picture quality of the electroluminescent display device.
Implementation Method 1
The emission layer can be formed of an organic material which emits light when exciton is produced by a bond of electron and hole, and the exciton falls to a ground state from an excited state
Data Source
AI summary
An electroluminescent display device includes a first electrode provided on a substrate, a bank disposed on the first electrode and defining a plurality of emission areas above the first electrode, an emission layer provided in the plurality of emission areas and configured to emit light wherein the emission layer in each of the plurality of emission areas has a curved top surface, and a second electrode provided on the bank and the emission layer, wherein among the plurality of emission areas, each of a first emission area and a second emission area is provided with a rounded corner, and wherein a first radius curvature (R1) in the rounded corner of the first emission area is different from a second radius curvature (R2) in the corner of the second emission area.