Head-Mounted Display Focal Adjustment Without Mechanical Movement
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Solution Overview
Problem
Existing head-mounted display devices require mechanical movement of display panels to change the focal distance, leading to increased size, weight, and cost due to the need for a configuration that adjusts display panels for each eye.
Innovation Solution
A head-mounted display device that uses image processing units to control display drive units, adjusting the emission areas of image light to change the focal distance without mechanical movement of constituent members, allowing for simultaneous recognition of virtual images and external scenes by controlling the convergence angle of the user's eyes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If display panels are mechanically moved to change focal distance, then focal distance adjustment is achieved, but device size and weight increase
Solution Approach 1:
The patent replaces the mechanical movement system with an optical control system. Instead of physically moving display panels using motors or mechanical actuators, the invention uses an image processing unit to control display drive units that adjust the emission areas of image light. This substitutes mechanical action with optical/electronic control, eliminating the need for heavy mechanical components while achieving the same focal distance adjustment effect.
Solution Approach 2:
The patent introduces an image processing unit as an intermediary between the control system and the display panels. This intermediary processes images and controls the emission areas of light from display drive units, serving as a mediator that achieves focal distance adjustment without direct mechanical movement of the display panels themselves. The intermediary converts mechanical adjustment requirements into optical control signals.
2Manufacturing precision
If display panels are mechanically moved to change focal distance, then focal distance adjustment is achieved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical movement mechanisms with a simpler electronic control system. The image processing unit and display drive units provide focal distance adjustment through electronic signal processing rather than mechanical actuation, reducing the number of moving parts, fasteners, and mechanical components required in the device.
3Manufacturing precision
If display panels are mechanically moved to change focal distance, then focal distance adjustment is achieved, but manufacturing cost increases
Solution Approach 1:
The patent replaces expensive mechanical adjustment mechanisms with more cost-effective electronic control components. The image processing unit and display drive units can be manufactured using standard semiconductor fabrication processes, which are generally more scalable and cost-effective than precision mechanical assemblies requiring specialized machining, assembly, and calibration facilities.
Data Source
AI summary
A head-mounted display device includes an image processing unit that controls a display drive units. The image processing unit controls the pair of display drive units so as to move the emission areas in any one of a first direction in which an image formed by the image light emitted from one of the display drive units and an image formed by the image light emitted from the other of the display drive units move close to each other in cooperation and a second direction in which an image formed by the image light emitted from one of the display drive units and an image formed by the image light emitted from the other of the display drive units move apart from each other in cooperation to change a focal distance of an image in a virtual image which is visually recognized by the user.