Subpixel Lens and Concave Layer Layout for Light Extraction
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Solution Overview
Problem
Existing display devices face challenges in improving light extraction efficiency and achieving high luminance while operating at low power consumption.
Innovation Solution
The display device incorporates a semiconductor structure with a substrate, insulating layer, bank layer, and lens parts, featuring concave portions and openings that enhance light extraction efficiency and luminance characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional flat insulating layer structure is used, then manufacturing is simple, but light extraction efficiency is low
Solution Approach 1:
The insulating layer is formed with concave portions having curved surfaces instead of flat surfaces. These concave portions with spherical or hemispherical curvature modify the optical path of emitted light, reducing total internal reflection and improving light extraction efficiency from the OLED structure.
Solution Approach 2:
The insulating layer transitions from a two-dimensional flat structure to a three-dimensional structure with concave portions extending through its thickness. This dimensional change creates varying refraction angles and improves light extraction by utilizing the third dimension (depth) to manipulate optical paths.
2Ease of manufacture
If conventional uniform opening structure is used, then manufacturing is simple, but luminance characteristics are insufficient
Solution Approach 1:
The bank layer openings are designed with different sizes corresponding to different concave portions. Specifically, openings associated with larger concave portions have greater areas, while openings associated with smaller concave portions have smaller areas. This local variation optimizes light extraction and luminance characteristics for each subpixel region.
Solution Approach 2:
The opening structure breaks symmetry by having non-uniform opening sizes across different regions. The asymmetric opening design allows each opening to be optimally sized for its corresponding concave portion, improving overall luminance characteristics while maintaining manufacturing feasibility.
3Device complexity
If conventional light emitting element structure is used, then device complexity is low, but light efficiency is insufficient
Solution Approach 1:
Lens parts with curved surfaces are positioned over the light emitting elements and concave portions. These lens parts focus and direct emitted light, improving light efficiency by reducing losses from total internal reflection while adding minimal structural complexity to the overall device.
Solution Approach 2:
The lens parts are positioned to overlap and nest over the existing light emitting elements and concave portions structure. This nested arrangement integrates the light efficiency improvement function within the existing device architecture without requiring complete structural redesign.
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 improves light extraction efficiency and allows for low-power driving through high luminance characteristics, effectively addressing the limitations of existing display devices.
Implementation Method 1
an insulating layer on the substrate and including a plurality of concave portions that extend through a thickness of the insulating layer... a plurality of lens parts over the insulating layer and the bank layer
Data Source
AI summary
A display device is disclosed that includes an insulating layer located on a substrate. The insulating layer includes a plurality of concave portions which are located in a plurality of subpixels. An area of a first concave portion disposed in a first subpixel among the plurality of subpixels is larger than an area of a second concave portion disposed in a second subpixel among the plurality of subpixels. A plurality of lens parts are located on the insulating layer, and include a first lens part corresponding to the first concave portion and a second lens part corresponding to the second concave portion. It is possible to provide a display device capable of improving light extraction efficiency.