Visual Optical System With Hidden Eye Tracking Optics
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Solution Overview
Problem
VR hardware is limited by insufficient storage space and computing power, leading to the need for higher-resolution displays which increase these demands, and Eye Tracking Cameras are visibly placed, affecting the aesthetic appeal of VR devices.
Innovation Solution
A visual optical system comprising a first optical system with a reflective polarizing element and quarter wave plate, and a second optical system for eye tracking, designed to minimize visibility and optimize space, ensuring eye tracking functionality while maintaining aesthetics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If Eye Tracking Cameras are placed on the bracket near the eye-end of VR devices, then eye tracking functionality is achieved, but the cameras become visible to users and affect the aesthetic appeal of VR devices
Solution Approach 1:
The eye tracking camera is extracted from the visible bracket area and integrated into the optical path within the optical system. The camera is positioned to capture images through the optical elements (lens, reflective polarizing element, quarter wave plate) rather than being mounted externally, making it invisible to users while maintaining eye tracking functionality
Solution Approach 2:
The eye tracking camera is merged with the optical system components. The camera is positioned at the image plane of the optical system, sharing the same space and optical path as the display optics. This integration allows the camera to function invisibly within the VR device structure
2Measurement precision
If higher-resolution LCD screens or Micro-OLED screens are used to address the screen-door effect, then display resolution is improved, but storage space and computing power requirements increase
Solution Approach 1:
The patent replaces the conventional LCD/Micro-OLED display system with a light field-based optical system. Instead of using high-resolution screens that require significant storage space, the system uses optical elements (lens, reflective polarizing element, quarter wave plate) to manipulate light fields and create immersive visual experiences, thereby reducing storage space requirements while maintaining or improving display quality
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 system achieves miniaturization of the eye tracking system, ensuring its functionality without compromising the appearance of VR devices, thus enhancing user experience and immersion.
Implementation Method 1
a first lens element, a reflective polarizing element and a quarter wave plate
Implementation Method 2
a reflective polarizing element and a quarter wave plate
Implementation Method 3
a reflective polarizing element and a quarter wave plate; the quarter wave plate may change a polarization state of polarized light
Implementation Method 4
a first lens element, a reflective polarizing element and a quarter wave plate; the first optical system sequentially includes: a first element group, a second element group and a third element group
Data Source
AI summary
A visual optical system is provided, including a first optical system and a second optical system, the first optical system sequentially includes: a first element group, a second element group and a third element group, the first element group including a first lens element, a reflective polarizing element and a quarter wave plate; and the second optical system sequentially includes: a first lens, a second lens er, a third lens and a fourth; where, a distance TDm from a first side surface of the first element group to a second side surface of the third element group on the first optical axis and a distance TDe from a first surface of the first lens to a second surface of the fourth lens on the second optical axis satisfy: 5.0<TDm/TDe<15.0.