Prism Array Light Conversion Structure for VR Backlight Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Virtual reality (VR) display systems face challenges in light efficiency due to the optical path characteristics of small screen sizes, leading to lower light energy utilization ratios and increased power consumption, as reflected light with a long optical path length is not effectively utilized.
Innovation Solution
A light conversion structure comprising a transparent substrate with first and second prism structures arranged in an array, where incident light enters and exits at predetermined angles, allowing for the adjustment of exiting angles to match the VR optical path, thereby improving light energy utilization and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If reflected light is used in VR display systems, then light energy can be reused, but the long optical path length reduces light efficiency and increases power consumption
Solution Approach 1:
The patent transforms the optical path from a long reflected path to a short direct transmission path by introducing a light conversion structure with prism arrays. This converts the two-dimensional reflected light path into a three-dimensional direct transmission path through the transparent substrate, significantly reducing the optical path length and improving light energy utilization efficiency.
Solution Approach 2:
The patent changes the optical parameters by using prism structures with specific refractive indices and geometric configurations. By adjusting the prism angles and refractive indices, the light transmission direction and path length are optimized, converting reflected light into directly transmitted light with improved energy efficiency and reduced power consumption.
2Ease of operation
If the light conversion structure uses multiple prism structures with different configurations, then light direction control is improved, but device complexity increases
Solution Approach 1:
The patent divides the light conversion structure into multiple independent prism structures arranged in arrays on the transparent substrate. Each prism structure can be independently designed and positioned, allowing precise control of light directions for different viewing zones while maintaining modular simplicity in manufacturing and assembly.
Solution Approach 2:
The patent applies different prism configurations to different regions of the transparent substrate according to local optical requirements. Each area has prisms optimized for its specific function, enabling precise light direction control in different zones while keeping each local prism structure relatively simple and manufacturable.
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 light conversion structure enhances light energy utilization by directing reflected light effectively, improving the light energy utilization ratio and reducing power consumption in VR display devices with small screen sizes.
Implementation Method 1
each of the first prism structures includes a first light-entering surface and a second light-entering surface that are arranged adjacent or opposite to each other, the first light-entering surface is used to receive a first incident light entering in a first direction, and the second light-entering surface is used to receive a second incident light entering in a second direction
Implementation Method 2
the first incident light enters the first prism structure from the first light-entering surface, passes through the transparent substrate and the second prism structure corresponding to the first prism structure
Data Source
AI summary
A light conversion structure, backlight device and virtual reality display device are provided. The light conversion structure includes: a transparent substrate including first and second surfaces arranged oppositely; multiple first prism structures arranged in an array on the first surface, each first prism structure includes first and second light-entering surfaces arranged adjacently or oppositely, the first and second light-entering surfaces are for receiving the first and second incident light respectively; multiple second prism structures arranged in an array on the second surface, each second prism structure includes the first and second light-exiting surfaces arranged adjacently or oppositely; the first and second incident light enter the first prism structure from the first and second light-entering surfaces respectively, and exit from the first and second light-exiting surfaces respectively at the first and second predetermined angles respectively; a difference between the first and second predetermined angles is less than a predetermined value.