Head-Mounted Display Divider Plates Block Crosstalk
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Solution Overview
Problem
Head-mounted displays suffer from crosstalk issues where display light from one eye's display element enters the opposite eye, degrading image quality and causing noise components like double images, particularly when the optical system is enlarged to increase viewing angle.
Innovation Solution
Incorporating a reflective member to reflect display light towards the user, a beam splitter between the reflective member and the user's eyes, and divider plates to block crosstalk light, with the divider plates being designed to diffuse reflectance to blend with the user's skin tone, preventing the divider plates from being visible and reducing crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the optical system is enlarged to increase the viewing angle, then the viewing angle is improved, but crosstalk increases
Solution Approach 1:
The optical system is divided into separate left and right optical paths using individual beam splitters (122L, 122R) and combiners (121L, 121R) for each eye, rather than using a single shared optical path. This segmentation prevents light from the right display element from entering the left eye and vice versa, eliminating crosstalk while maintaining independent optimization of each eye's optical path for wide viewing angle
Solution Approach 2:
Divider plates (141, 142) are introduced as intermediary components between the display elements and the beam splitters. These divider plates act as mediators that block light from the right display element from reaching the left beam splitter and vice versa, preventing crosstalk while allowing the optical systems to be enlarged for increased viewing angle
2Object-generated harmful factors
If divider plates are added to block crosstalk light, then crosstalk is reduced, but device complexity increases
Solution Approach 1:
The divider plates (141, 142) are combined with the beam splitter assembly structure, integrating the crosstalk blocking function into the existing optical path definition. The divider plates are positioned to define the boundaries between left and right optical spaces, merging the separation function with the structural framework rather than adding completely independent components
Solution Approach 2:
The divider plates serve multiple functions: they block crosstalk light, define the optical space boundaries, and can be integrated with the beam splitter mounting structure. This multi-functionality reduces the need for separate dedicated components, thereby limiting the increase in device complexity while achieving effective crosstalk reduction
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 effectively reduces crosstalk, enhancing display quality by preventing light from entering the wrong eye and ensuring high accuracy in alignment, even when made with resin to reduce weight and cost.
Implementation Method 1
a beam splitter arranged between the reflective member and the user across a space in front of a left eye of the user and a space in front of a right eye, and configured to reflect the display light to the reflective member and transmit the display light that has been reflected by the reflective member
Implementation Method 2
divider plates to block crosstalk light, with the divider plates being designed to diffuse reflectance to blend with the user's skin tone
Data Source
AI summary
A head-mounted display according to an embodiment includes a reflective member configured to reflect display light for forming a display image toward a user, a beam splitter arranged between the reflective member and the user across a space in front of a left eye and a space in front of a right eye, a first divider plate arranged in front of the beam splitter between the space in front of the left eye of the user and the space in front of the right eye, and a second divider plate arranged behind the beam splitter between the space in front of the left eye of the user and the space in front of the right eye, and an end of the first divider plate proximate to the beam splitter is hidden from the user.