Light-Emitting Layer Groove Structure for Display Color Mixing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In high-resolution display apparatuses, the close proximity of sub-pixels leads to color mixing issues due to light-emitting layers of different colors easily stacking on top of each other.
Innovation Solution
A display apparatus with a light-emitting layer featuring a groove structure or protrusion structure is manufactured using fine metal masks to prevent overlapping of light-emitting layers, ensuring accurate alignment and reducing color mixing by adjusting the thickness of isolation layers instead of the hole transport layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the distance between sub-pixels is reduced to achieve high resolution, then the display resolution is improved, but color mixing occurs due to light-emitting layers stacking on each other
Solution Approach 1:
The light-emitting layer is segmented into multiple sub-layers (first light-emitting material layer and second light-emitting material layer) with different colors. By separating the light-emitting functions into distinct layers, the patent prevents color mixing while maintaining high resolution display capabilities.
Solution Approach 2:
Different regions of the light-emitting layer are assigned different properties through the use of groove structures or protrusion structures. These local structural variations ensure that light-emitting materials of different colors are spatially separated at specific locations, preventing color mixing while allowing close sub-pixel spacing for high resolution.
2Ease of manufacture
If conventional manufacturing methods are used without groove or protrusion structures, then the manufacturing process is simple, but color mixing occurs due to light-emitting layer stacking
Solution Approach 1:
The light-emitting layer is divided into multiple depositable sub-layers, each corresponding to different color regions. This segmentation allows precise control over material placement while maintaining a relatively simple manufacturing process using conventional vacuum deposition techniques and masks.
Solution Approach 2:
Groove structures or protrusion structures are pre-formed in the light-emitting layer before final material deposition. This preliminary action creates predetermined separation zones that guide subsequent material placement, preventing color mixing while streamlining the overall manufacturing process.
3Manufacturing precision
If the thickness of the hole transport layer is adjusted to prevent color mixing, then color accuracy is improved, but the device complexity increases
Solution Approach 1:
Instead of adjusting the thickness of the hole transport layer, the patent segments the light-emitting layer into multiple color-specific sub-layers. This approach achieves color accuracy through spatial separation of light-emitting materials rather than through complex thickness adjustments of transport layers, thereby reducing device complexity.
Solution Approach 2:
The patent transitions from controlling color accuracy through vertical thickness adjustments of the hole transport layer to achieving color accuracy through horizontal spatial separation using groove or protrusion structures in the light-emitting layer, effectively moving the solution to another dimensional approach.
Data Source
AI summary
A display apparatus and a manufacturing method of the display apparatus are provided. The display apparatus includes a substrate and a first sub-pixel located on the substrate. The first sub-pixel includes a first bottom electrode, a first light-emitting layer, and a first top electrode. The first light-emitting layer is located on the first bottom electrode. The first light-emitting layer includes a first groove structure or a first protrusion structure. The first top electrode is located on the first light-emitting layer.