Mirror-Based Optical Layout for Compact Gaze Sensing Displays
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Solution Overview
Problem
Existing electronic devices with gaze sensing functions for VR or AR require an optical system that is appropriately adjusted for the positional relationship between the user's eyes and the display and imaging systems, leading to challenges in downsizing and integrating these components effectively.
Innovation Solution
An optical device with a display apparatus and optical system incorporating mirrors and lenses to control light paths, allowing for a compact design that includes a sensor region overlapping with the display region, and utilizing infrared light for gaze sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate optical systems are provided for display and imaging functions, then functional reliability is improved, but device size increases
Solution Approach 1:
The patent merges the display optical system and imaging optical system into a single integrated optical system. The same optical components (lenses, mirrors, beam splitters) are used for both displaying images to the user and capturing images of the user's eyes for gaze sensing, eliminating the need for separate optical paths and reducing overall device size while maintaining both functions.
Solution Approach 2:
The optical system is designed to perform multiple functions: it displays visual content to the user, captures reflected light from the user's eyes for gaze tracking, and enables both functions simultaneously through a single optical path. This multi-functionality reduces the number of components needed and shrinks the device form factor.
2Measurement precision
If optical system is adjusted for positional relationship between eyes and display, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent uses a beam splitter to separate light paths in different spatial dimensions. The display light travels through one path while the imaging light is reflected through another path, allowing both optical paths to coexist in a compact configuration without requiring complex mechanical adjustments for positioning.
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 solution enables a downsized optical device with a gaze sensing function, providing a novel and efficient integration of display and sensing components, thereby reducing the overall size and enhancing the functionality of VR or AR devices.
Implementation Method 1
The first mirror is provided on an optical path of the first light and has a function of transmitting the first light incident on the first surface to the second surface and a function of reflecting second light incident on the second surface
Implementation Method 2
The second mirror is provided on an optical path of the second light and has a function of reflecting the second light
Implementation Method 3
The sensor region has a function of detecting the second light via the first mirror and the second mirror
Implementation Method 4
The display region has a function of emitting first light
Implementation Method 5
the light source has a function of emitting third light, and the second light is light reflected by an object irradiated with the third light
Data Source
AI summary
An optical device of the present invention includes a display apparatus and an optical system. The display apparatus includes a display region and a sensor region. The optical system includes a first mirror and a second mirror. The first mirror includes a first surface and a second surface. The display region has a function of emitting first light. The first mirror is provided on an optical path of the first light and has a function of transmitting the first light incident on the first surface to the second surface and a function of reflecting second light incident on the second surface. The second mirror is provided on an optical path of the second light and has a function of reflecting the second light. The sensor region has a function of detecting the second light via the first mirror and the second mirror.