Display Light-Path Control Layer for Viewing-Angle Limitation
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Solution Overview
Problem
Existing display devices face challenges in effectively limiting viewing angles and improving front light-emitting efficiency, particularly in environments requiring information protection or safety regulations.
Innovation Solution
A display device with a light-path control layer comprising horizontal and vertical walls, transmission parts, and light-collecting parts with specific refractive indices, designed to control light paths and enhance viewing angle limitations while improving front light-emitting efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional display panel is used without additional light control structures, then the device structure remains simple, but the viewing angle limitation characteristics are insufficient and front light-emitting efficiency is reduced
Solution Approach 1:
The light-path control layer is segmented into multiple functional components: horizontal walls for viewing angle control, vertical walls for light direction, transmission parts for light passage, and light-collecting parts for efficiency enhancement. This segmentation allows each component to perform its specific function optimally while collectively achieving both viewing angle limitation and improved front light-emitting efficiency without excessive overall complexity
Solution Approach 2:
The invention introduces a new dimensional element by adding a light-path control layer with three-dimensional structures (walls with height, width, and depth) on top of the conventional two-dimensional display panel. This dimensional addition enables sophisticated light path control for viewing angle limitation while the transparent nature and strategic positioning of these structures maintain acceptable overall device complexity
2Illumination intensity
If the thickness of the first transmission part is increased to improve light transmission, then light-emitting efficiency may improve, but the viewing angle limitation capability is reduced
Solution Approach 1:
The first transmission part has locally optimized quality with a specifically controlled thickness range (50-200 micrometers) that balances light transmission and viewing angle limitation. The local quality is further enhanced by positioning the light-collecting part adjacent to the light-emitting element, which concentrates light extraction efficiency in the critical front viewing direction while maintaining viewing angle control through the surrounding wall structures
3Illumination intensity
If uniform refractive index materials are used throughout the light-path control layer, then manufacturing is simplified, but light path control precision and light-emitting efficiency are reduced
Solution Approach 1:
The invention utilizes parameter changes in refractive index across different materials to achieve precise light path control. The first transmission part (refractive index 1.4-1.6) and light-collecting part (refractive index 1.6-1.8) have different refractive indices, enabling optimized light extraction and direction control. This parameter differentiation improves front light-emitting efficiency and viewing angle control, while the materials selected fall within commonly available ranges that balance manufacturing feasibility with performance requirements
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 achieves improved viewing angle limitation characteristics and enhanced front light-emitting efficiency by controlling light paths through the use of refractive index variations and light-collecting structures, ensuring safety and efficiency in display devices.
Implementation Method 1
a light-collecting part disposed between the plurality of horizontal walls on the first transmission part, and an upper surface of the light-collecting part may be concave toward the first transmission part. In an embodiment, each of the first transmission part and the light-collecting part may have a refractive index of about 1.4 to about 1.5
Implementation Method 2
the display device may further include a second transmission part disposed on the light-collecting part. In an embodiment, the second transmission part may have a refractive index greater than a refractive index of the first transmission part and a refractive index of the light-collecting part. In an embodiment, the second transmission part may have a refractive index of about 1.55 to about 1.8
Data Source
AI summary
Provided is a display device including a display panel and a light-path control layer disposed on the display panel to control a path of light provided from the display panel, the light-path control layer includes a plurality of horizontal walls arranged in a first direction and extending in a second direction perpendicular to the first direction, a first transmission part disposed between the plurality of horizontal walls and having a thickness smaller than a height of each of the plurality of horizontal walls, and a light-collecting part disposed between the plurality of horizontal walls and disposed on the first transmission part, and an upper surface of the light-collecting part is concave toward the first transmission part.