Reflective Light Guide Structure for High-Resolution Display Subpixels
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices, particularly head-mounted displays, face challenges in accurately forming and patterning light emitting layers of different colors due to compact pixel intervals, leading to limitations in resolution and light efficiency.
Innovation Solution
A display device design featuring a substrate with subpixels having separate light emitting areas and electrodes, along with a light guide structure that directs light from a first light emitting layer to a second light emitting area, allowing for independent emission of light and minimizing the need for a fine metal mask, thus enabling high-resolution display with compact pixel intervals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a fine metal mask is used to pattern light emitting layers in compact pixel intervals, then light emitting layers of different colors can be formed, but manufacturing precision and reliability deteriorate due to alignment difficulties and process complexity
Solution Approach 1:
The pixel is divided into multiple subpixels, each subpixel containing multiple light emitting areas. This segmentation allows light emitting layers to be formed in a sequential manner without requiring complex fine metal mask alignment, as each light emitting area can be addressed independently through the light guide structure.
Solution Approach 2:
A light guide structure is introduced as an intermediary component between the first light emitting layer and the second light emitting area. This light guide structure enables light from the first light emitting layer to be redirected to the second light emitting area, eliminating the need for complex fine metal mask patterning while achieving the desired light emission control.
2Measurement precision
If pixel intervals are reduced to increase display resolution, then more subpixels can be packed, but light efficiency deteriorates due to increased light interference and reduced light extraction
Solution Approach 1:
Each subpixel is designed with distinct local characteristics, including multiple light emitting areas with different light guide structures. This local quality differentiation ensures that light from each light emitting area is independently controlled and directed, preventing light interference even at compact pixel intervals, thereby maintaining both high resolution and light efficiency.
3Adaptability or versatility
If multiple light emitting layers are stacked to emit different colors, then color display capability is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The light guide structure serves multiple functions: it guides light from the first light emitting layer to the second light emitting area, acts as a structural support, and enables independent control of different light emitting areas. This multi-functionality reduces the need for additional separate components, thereby managing device complexity while achieving versatile color emission capability.
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
The solution enhances light efficiency and reduces power consumption by allowing independent light emission from each subpixel, while minimizing the interval between subpixels, thereby improving display resolution and maintaining light extraction efficiency comparable to devices with larger pixel intervals.
Implementation Method 1
a light guide structure provided between the substrate and the first electrode, guiding light emitted from the first light emitting layer to be emitted to the second light emitting area
Data Source
AI summary
A display device is disclosed. The display device includes a substrate provided with a plurality of subpixels including a first light emitting area and a second light emitting area, a first electrode in the first light emitting area of each of the plurality of subpixels on the substrate, a first light emitting layer provided on the first electrode, a second electrode provided on the first light emitting layer, a second light emitting layer provided on the second electrode, a third electrode provided on the second light emitting layer, and a light guide structure provided between the substrate and the first electrode, guiding light emitted from the first light emitting layer to be emitted to the second light emitting area.