Holographic Optical Element for Eye-Tracking-Free Video Projection
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Solution Overview
Problem
Head-mounted displays that project video images directly onto a retina can be affected by the position of the pupil, causing video display light to miss the retina when the eyeball rotates, leading to incomplete image recognition.
Innovation Solution
A video projection system with a fixed positional relationship between an optical element and the eyeball, where the optical element collects video display light near the pupil and directs it to the retina, using a holographic optical element and a two-dimensional array display element to ensure consistent light delivery regardless of eyeball movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If video display light is projected directly onto the retina using a head-mounted display, then the image can be superimposed on the outside world scene, but the video display light may not reach the retina when the eyeball rotates or the pupil position changes
Solution Approach 1:
The optical element is pre-configured with a fixed positional relationship to the eyeball before use. This preliminary positioning ensures that the optical element consistently directs video display light toward the pupil and retina regardless of subsequent eyeball rotation or pupil position changes, eliminating the need for dynamic adjustment mechanisms
Solution Approach 2:
An optical element is introduced as an intermediary component between the video projection device and the eyeball. This optical element collects video display light near the pupil and redirects it to the retina, serving as a mediator that compensates for pupil position variations and ensures consistent light delivery
2Area of stationary object
If the optical element is positioned close to the eyeball surface, then the field of view can be widened and image stability improved, but the device complexity increases
Solution Approach 1:
The optical element is designed to perform multiple functions simultaneously: it collects video display light, redirects it toward the retina, compensates for pupil position changes, and enables wide field of view. By consolidating these functions into a single optical component, the system achieves enhanced performance without proportionally increasing overall device complexity
Solution Approach 2:
The optical element incorporates a curved surface with a curvature center that is substantially concentric with the curvature center of the eyeball surface. This spherical geometry allows the optical element to work effectively with the natural curvature of the eyeball, enabling wide field of view and maintaining image quality across different viewing angles without requiring complex adaptive optics
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
Enables consistent and wide-field video image recognition without the need for eye tracking, allowing for a larger field of view and improved image stability across various eye positions.
Implementation Method 1
the optical element may have a holographic optical element layer, and the holographic optical element layer may diffract the video display light incident on the optical element to be collected near the pupil
Data Source
AI summary
The present technology provides a video projection system (100) including: a video projection device (101) equipped with a projection optical system (110) configured to project video display light onto an eyeball (130); and an optical element (120) configured to cause the video display light to be collected near a pupil and then to reach a retina. The video projection system (100) is used in a state where a positional relationship between the optical element (120) and the eyeball (130) is fixed. Furthermore, the present technology also provides a video projection method including: a projection step of projecting video display light from a video projection device toward an eyeball; and a light collecting step of causing video display light projected in the projection step to be collected near a pupil with an optical element (120) and then to reach a retina. The projection step and the light collecting step are performed in a state where a positional relationship between the optical element (120) and the eyeball (130) is fixed.