Angle Selection Transmission Element for HMD Ghosting Reduction
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Solution Overview
Problem
Existing technologies for finders, such as camera viewfinders and head-mounted displays, suffer from ghosting due to external light, which cannot be effectively reduced without causing vignetting, especially when users move their heads.
Innovation Solution
An angle selection type transmission element is introduced, featuring a limiter with radially arranged opening portions that control the passage direction of light flux, preventing ghosting while maintaining clear peripheral vision by optimizing the angle of convergence for right and left eyes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a louver film is provided on the eye side of the display unit to cut out light in the light-shielding direction, then ghosting is reduced, but vignetting of the peripheral unit occurs when the user brings their eyes close to the finder
Solution Approach 1:
The louver film is divided into a first louver film and a second louver film with different light-shielding directions. The first louver film shields light from one direction while the second louver film shields light from another direction, allowing comprehensive ghosting reduction without requiring a single film to block all external light directions, thereby avoiding peripheral vignetting
Solution Approach 2:
Different regions of the louver film structure are designed with different light-shielding characteristics. The first and second louver films are positioned and oriented to provide localized light shielding in specific directions, allowing light to pass through other directions including peripheral areas, thus reducing ghosting while maintaining wide visual field
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 solution allows for effective reduction of ghosting without vignetting, enabling clear eyepiece observation even when users move their heads, ensuring a wide visual field and preventing unnecessary light from entering the eyepiece lens system.
Implementation Method 1
a limiter (6d) that limits a passage direction of a light flux; passage portions in which the light flux passes in the limiter are formed radially centering on pre-decided points 3-dimensionally
Data Source
AI summary
A head-mounted display (HMD) includes an electronic viewfinder. An angle selection type transmission element is provided on an optical path of the electronic viewfinder. The angle selection type transmission element is provided at a location facing an eyepoint and includes a plurality of opening portions as a limiter that limits a passage direction of light to a predetermined range. In the angle selection type transmission element, limitation angle range in the passage direction of the light is different in at least two regions and light in a direction other than the eyepoint can be limited or blocked.