Display Device Sidewall Insulation for High Luminance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices struggle to achieve high luminance, high resolution, and high reliability, particularly in large-sized and high-definition applications such as virtual reality and augmented reality.
Innovation Solution
A display device comprising multiple light-emitting devices with specific structural layers, including conductive layers, insulating layers, and a common electrode, which are designed to enhance luminance, resolution, and reliability through precise patterning and layer alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional light-emitting device structures are used, then device simplicity is maintained, but luminance and resolution are insufficient
Solution Approach 1:
The light-emitting device is divided into multiple functional layers including first and second conductive layers, first and second insulating layers, and multiple sidewall insulating layers. Each layer serves a specific function in controlling current flow and preventing short circuits, enabling high luminance through improved electrical isolation and current distribution.
Solution Approach 2:
Multiple sidewall insulating layers are formed at different heights and positions around the conductive layers. The first sidewall insulating layer contacts the first conductive layer, while the second and third sidewall insulating layers are formed at different elevations to provide comprehensive lateral isolation. This multi-dimensional arrangement prevents current leakage and enables higher luminance output.
2Manufacturing precision
If conventional fabrication processes are used, then manufacturing simplicity is maintained, but manufacturing precision is insufficient for high-resolution displays
Solution Approach 1:
The first sidewall insulating layer is formed preliminarily before the second and third sidewall insulating layers. This sequential formation allows each layer to be precisely positioned and aligned with the underlying conductive layers before subsequent layers are added, ensuring high manufacturing precision for high-resolution displays.
Solution Approach 2:
The second sidewall insulating layer is formed over the first sidewall insulating layer, and the third sidewall insulating layer is formed over the second sidewall insulating layer. This nested structure allows multiple insulating layers to be precisely aligned with each other and with the conductive layers, achieving the required manufacturing precision for high-resolution displays while maintaining a compact fabrication process.
3Reliability
If conventional insulating layer arrangements are used, then device simplicity is maintained, but reliability is insufficient due to potential short circuits
Solution Approach 1:
Multiple sidewall insulating layers are formed beforehand to prevent potential short circuits between conductive layers. The first sidewall insulating layer provides initial isolation, while the second and third sidewall insulating layers provide additional protective barriers at different heights, preventing short circuits that might occur during device operation or under stress conditions.
Solution Approach 2:
The insulating structure extends into the vertical dimension with sidewall insulating layers formed at different heights. The second sidewall insulating layer is formed higher than the first, and the third sidewall insulating layer provides additional vertical isolation. This multi-level arrangement comprehensively prevents short circuits between conductive layers, significantly improving device reliability.
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 proposed solution enables display devices to operate at high luminance, achieve high resolution, and ensure high reliability, thereby addressing the limitations of existing technologies in these areas.
Implementation Method 1
The first sidewall insulating layer is in contact with a side surface of the first conductive layer and a side surface of the first light-emitting layer. The second sidewall insulating layer is in contact with a side surface of the second conductive layer and a side surface of the second light-emitting layer.
Implementation Method 2
The insulating layer overlaps with a side surface and part of a top surface of each of the first conductive layer, the first light-emitting layer, the second conductive layer, and the second light-emitting layer.
Implementation Method 3
The common electrode is provided over the first layer, the second layer, and the insulating layer.
Data Source
AI summary
A method for fabricating a highly reliable display device is provided. A first conductive film is formed; a first film containing a first light-emitting substance is formed over the first conductive film; a first mask film is formed over the first film; the first conductive film, the first film, and the first mask film are processed such that their side surfaces are substantially aligned with each other to form a first conductive layer, a first layer, and a first mask layer; a second conductive film is formed over the first mask layer and a first sidewall insulating layer; a second film containing a second light-emitting substance is formed over the second conductive film; a second mask film is formed over the second film; and the second conductive film, the second film, and the second mask film are processed such that their side surfaces are substantially aligned with each other to form a second conductive layer, a second layer, and a second mask layer and to expose the top surface of the first mask layer.