Patterned Bank Electrodes for Display Side Luminance
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Solution Overview
Problem
Current display devices face challenges in achieving improved light emission efficiency, particularly in scattering light emitted from light emitting elements to enhance side luminance and visibility.
Innovation Solution
The display device incorporates a substrate with first banks having concave and convex pattern portions on their side surfaces, electrodes with corresponding pattern shapes, and insulating layers with specific refractive indices, which scatter light emitted from light emitting elements by reflecting and refracting it in various directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light emitting elements are arranged in a display device, then light emission is achieved, but light scattering and side luminance are insufficient
Solution Approach 1:
The bank structure is segmented into multiple pattern portions with different shapes (concave, convex, inclined surfaces) arranged in specific patterns. These segmented patterns scatter light in different directions, enhancing side luminance without requiring complete restructuring of the display device
Solution Approach 2:
The patent introduces vertical dimension variations through inclined surfaces and multi-level pattern portions on the banks. By creating three-dimensional light scattering structures rather than flat surfaces, the device achieves improved side luminance through additional spatial dimensions for light redirection
2Illumination intensity
If pattern portions are added to banks to scatter light, then side luminance improves, but manufacturing complexity increases
Solution Approach 1:
Pattern portions are selectively applied only to specific regions of the banks where light scattering is most beneficial for enhancing side luminance. Not the entire bank structure is patterned, but specific local areas with concave, convex, and inclined surfaces are created to optimize light scattering while minimizing overall structural complexity
Solution Approach 2:
The patent employs curved surfaces including concave portions, convex portions, and inclined surfaces with specific curvature radii. These curved geometries naturally scatter light in multiple directions and are formed using standard photolithography and etching processes, achieving complex optical functionality without proportionally increasing manufacturing difficulty
3Illumination intensity
If multiple insulating layers with different refractive indices are used, then light scattering efficiency improves, but manufacturing steps increase
Solution Approach 1:
The patent utilizes changes in refractive index parameters by selecting insulating materials with specific refractive index values (first insulating layer: 1.3-1.6, second insulating layer: 1.6-1.8). This material parameter optimization enhances light scattering efficiency at interfaces without requiring additional structural layers or complex manufacturing processes
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 significantly improves light emission efficiency and side luminance by maximizing the scattering effect of light, ensuring that light is emitted even in areas without light emitting elements, thereby enhancing overall display performance.
Implementation Method 1
a first pattern portion including a plurality of concave portions and convex portions... scatter light emitted from light emitting elements by reflecting and refracting it in various directions
Implementation Method 2
scatter light emitted from light emitting elements by reflecting and refracting it in various directions
Implementation Method 3
scatter light emitted from light emitting elements by reflecting and refracting it in various directions
Implementation Method 4
The first insulating layer may have a smaller refractive index than each of a refractive index of the first contact electrode and a refractive index of the second contact electrode
Data Source
AI summary
A display device includes first banks on a substrate and spaced apart from each other, a first electrode and a second electrode on the first banks and spaced apart from each other, a first insulating layer on the first electrode and the second electrode, and light emitting elements on the first insulating layer and each having ends on the first electrode and the second electrode. Each of the first banks includes a first pattern portion including concave portions and convex portions. The first pattern portions of the first banks are disposed on side surfaces of the first banks. The side surfaces are spaced apart and face each other. Each of the first electrode and the second electrode includes a second pattern portion on the first pattern portion and having a pattern shape corresponding to the first pattern portion on a surface thereof.