Light Guide Plate Anisotropic Refraction for HMD Backlight Uniformity
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Solution Overview
Problem
The existing eyeball projection type video display devices have a complex structure with multiple components, such as a light guide plate, diffusion hole sheet, MLA, and eyepiece MLA, leading to increased production costs and reduced productivity due to the need for multiple parts and complex manufacturing processes.
Innovation Solution
A display device configuration that includes a light source, an optical member with a light exit surface, and a light refracting portion that applies an anisotropic refracting action to light rays exiting the edge portion of the light exit surface, directing them towards the middle section of the display panel, thereby reducing the need for additional components and improving light use efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a plate-like lighting means with light guide plate and diffusion hole sheet is used, then light distribution is improved, but device complexity and number of parts increase
Solution Approach 1:
The patent combines the light guide plate and diffusion hole sheet into a single integrated optical member. The optical member includes a light guide plate with embedded diffusion structures, eliminating the need for separate components. This merging reduces the number of parts while maintaining the light distribution functionality.
Solution Approach 2:
The integrated optical member performs multiple functions simultaneously: light guidance, diffusion, and light distribution. By embedding diffusion structures within the light guide plate, the single component achieves both light guiding and uniform distribution functions that previously required separate components.
2Illumination intensity
If multiple separate components (light guide plate, diffusion hole sheet, MLA arrays) are used, then optical performance is improved, but productivity deteriorates
Solution Approach 1:
The patent merges multiple optical components into a single integrated optical member that can be manufactured as one piece. This integration significantly reduces assembly steps and manufacturing complexity, thereby improving productivity while maintaining optical performance through the embedded diffusion structures.
3Illumination intensity
If multiple separate components are used, then optical functionality is improved, but manufacturing cost increases
Solution Approach 1:
By integrating multiple functions into a single optical member, the patent reduces the total number of components that need to be manufactured, purchased, and assembled. This consolidation lowers manufacturing costs through reduced part count and simplified production processes while maintaining optical functionality.
4Device complexity
If light rays exiting edge portion are not refracted, then simple structure is maintained, but light use efficiency decreases
Solution Approach 1:
The patent applies different refracting characteristics to different regions of the optical member. The light refracting portion is specifically positioned to handle edge portion light rays, while other regions maintain their original optical properties. This localized approach improves light use efficiency without requiring the entire optical member to be complex.
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 enhances display quality, reduces production costs, and improves productivity by effectively utilizing light rays and minimizing the number of parts required, resulting in a more efficient and cost-effective display device.
Implementation Method 1
a light refracting portion included in the optical member and applying an anisotropic refracting action to at least light rays exiting an edge portion of the light exit surface to be directed to a middle section of the display panel
Data Source
AI summary
A liquid crystal display device 10 includes a liquid crystal panel 11, a backlight device 12 supplying light to the liquid crystal panel 11, LEDs 13 included in the backlight device 12, a light guide plate 15 that is an optical member and included in the backlight device 12 and disposed opposite the liquid crystal panel 11 and has a light guide plate light exit surface 15a through which light from the LEDs 13 exits toward the liquid crystal panel 11, and a light guide plate side light collecting portion 20 included in the light guide plate 15, which is the optical member, and applying an anisotropic refracting action to at least light rays exiting an edge portion of the light guide plate light exit surface 15a to be directed to a middle section of the liquid crystal panel 11.