Orthogonal Cylindrical Optics for Cooler Long-Path Display Modules
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Solution Overview
Problem
Existing display devices suffer from increased temperature in focal areas due to light being focused at a single point, which can lead to overheating and potential downsizing challenges.
Innovation Solution
The display device incorporates a convex cylindrical first surface and a concave cylindrical reflective surface with orthogonal axial directions, along with a half mirror to increase optical path length and prevent light from focusing at a single point, using a convex cylindrical second surface and a concave cylindrical reflective surface to manage light entry and exit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional mirrors are used to reflect light in display devices, then the device structure is simple, but light focuses at a single point causing temperature increase and potential overheating
Solution Approach 1:
The patent applies cylindrical curvature to both the reflective surface and the optical element surfaces. The reflective surface has a cylindrical shape with a curvature radius R1, while the optical element has convex cylindrical first and second surfaces with curvature radii R2 and R3 respectively. This cylindrical curvature distribution prevents light from converging at a single focal point, thereby reducing temperature increase in focal areas while maintaining a manageable device structure.
2Length of moving object
If the optical path length is increased to display long-shaped images, then the image display capability is improved, but the device thickness increases
Solution Approach 1:
The patent utilizes the cylindrical curvature geometry to extend the optical path length in a direction perpendicular to the thickness direction. By configuring the reflective surface and optical element with cylindrical shapes, the light path can be lengthened along the curved surface while maintaining a compact thickness profile, effectively decoupling optical path length from device thickness.
3Volume of moving object
If conventional flat mirrors and lenses are used, then manufacturing is simple, but light focusing causes overheating and limits device downsizing
Solution Approach 1:
The patent employs cylindrical curvature for the reflective surface and optical element surfaces, which can be manufactured using conventional cylindrical grinding and polishing techniques. This approach enables device downsizing by preventing light focal point concentration that causes overheating, while remaining compatible with existing manufacturing processes for curved optical components.
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 reduces temperature increases in focal areas, allows for longer optical path lengths, enables the display of long-shaped images without increasing thickness, and facilitates downsizing of the device.
Implementation Method 1
The first surface is a convex cylindrical surface whose axial direction is a first direction, allows light emitted from the display to enter, and allows the light reflected by the reflective member to exit
Implementation Method 2
The reflective member includes a reflective surface that reflects the light that has entered from the first surface toward the first surface. The reflective surface is a concave cylindrical surface whose axial direction is the second direction
Implementation Method 3
The second surface is a convex cylindrical surface whose axial direction is a second direction orthogonal to the first direction
Data Source
AI summary
A display device includes: a display; an optical element including a first surface and a second surface; and a reflective member provided on the second surface. The first surface is a convex cylindrical surface whose axial direction is a first direction (parallel to the X axis), allows light emitted from the display to enter, and allows the light reflected by the reflective member to exit. The second surface is a convex cylindrical surface whose axial direction is a second direction (parallel to the Y axis) orthogonal to the first direction. The reflective member includes a reflective surface that reflects the light that has entered from the first surface toward the first surface. The reflective surface is a concave cylindrical surface whose axial direction is the second direction.