Display Partition Layer Height Variation for Light Extraction
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Solution Overview
Problem
Display devices face challenges in achieving high light emission efficiency due to absorption of light emitted from light-emitting elements, particularly in devices with color conversion layers where blue light is converted to red and green light, leading to reduced luminous efficiency.
Innovation Solution
The use of a display device structure with a partition layer having different height regions and an inclined surface, where the partition layer includes inorganic materials like silicon-based compounds, reduces light absorption and enhances reflectance by aligning the refractive indices of the partition and light-emitting element layer, and incorporates a reflection member with inclined surfaces to further increase light emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a color conversion layer is used to convert blue light to red and green light, then display color quality is improved, but light emission efficiency deteriorates due to absorption losses
Solution Approach 1:
The partition layer is divided into multiple height regions (first region with lower height, second region with intermediate height, third region with higher height) to create different optical paths. This segmentation allows light to be reflected at different locations, reducing absorption by the color conversion layer while maintaining color quality.
Solution Approach 2:
The partition layer introduces a vertical dimension variation through its multi-level height structure. By creating height differences in the vertical direction, the patent enables light reflection paths that avoid direct absorption by the color conversion layer, thereby improving light emission efficiency without sacrificing color quality.
2Illumination intensity
If the partition layer uses inorganic materials with specific refractive indices, then light reflectance is improved, but manufacturing complexity increases
Solution Approach 1:
The patent specifies refractive index parameters for the partition layer materials (inorganic materials with refractive indices of 1.4-2.5) to optimize light reflection. By controlling this physical parameter, the patent achieves high light reflectance while using standard inorganic materials that can be manufactured with existing techniques.
Solution Approach 2:
The partition layer can be formed using inorganic materials such as silicon oxide, silicon nitride, or silicon oxynitride, which are common in semiconductor manufacturing. These materials provide the necessary refractive index properties while being compatible with existing manufacturing processes, thus reducing overall manufacturing complexity.
3Illumination intensity
If the insulating layer has regions with different heights, then light emission efficiency is improved, but device structure complexity increases
Solution Approach 1:
The insulating layer with varying heights serves multiple functions: it provides electrical insulation, defines the partition structure, and creates the height differences necessary for light reflection. By making the insulating layer multi-functional, the patent reduces the need for additional separate structures, thereby managing device complexity while improving light emission efficiency.
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 by minimizing absorption and maximizing reflectance, particularly effective for blue light emission in color conversion displays, resulting in enhanced luminous output.
Implementation Method 1
increasing reflectance and reducing absorption of light emitted from the light-emitting element
Implementation Method 2
aligning the refractive indices of the partition and light-emitting element layer, reduces light absorption
Data Source
AI summary
A display device a includes: a transistor disposed on a first substrate; an insulating layer disposed on the transistor; a first electrode disposed on the insulating layer; a partition disposed on the first electrode and the insulating layer, an opening is defined through the partition; a light-emitting element layer disposed in the opening; and a second electrode disposed on the light-emitting element layer and the partition. The insulating layer includes a first region and a third region having different heights from each other and a second region having an inclined surface connecting the first region and the third region, the first region has a lower height than the third region, and the first electrode overlaps the first region in a direction perpendicular to the first substrate.