Display Eye-Imaging Optics With Nonparallel Optical Axes
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Solution Overview
Problem
Existing camera designs with a line-of-sight input function face challenges in capturing the user's eye without increasing the apparatus size or cost when the optical axes of the eyeball-imaging and finder systems are made independent, leading to difficulties in maintaining the user's eye within the imaging range as the pupil center position changes.
Innovation Solution
The optical axis of the eyeball-imaging system is nonparallel to the display optical system, with a projected line parallel to the long side of the imaging plane, eliminating the need for a light-splitting prism and maintaining optical performance without size or cost increases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the light-splitting prism is removed and the optical axes are made independent, then the apparatus size and cost are reduced, but it becomes more difficult to capture the user's eye within the imaging range
Solution Approach 1:
The patent changes the spatial relationship between the two optical systems by making their optical axes nonparallel rather than coincident. The eyeball-imaging optical system's optical axis is arranged at an angle to the finder optical system's optical axis, and the projected line of the finder optical axis on the imaging plane is made substantially parallel to the long side of the imaging plane. This dimensional reconfiguration allows independent optical paths while maintaining eye capture capability.
2Ease of manufacture
If the light-splitting prism is removed, then the cost is significantly reduced, but the line-of-sight input function becomes harder to maintain
Solution Approach 1:
The patent eliminates the need for a light-splitting prism by reconfiguring the optical paths in space. The independent optical axes are arranged such that the eyeball image sensor can still capture the user's eye through the nonparallel optical configuration, maintaining the line-of-sight input function without requiring expensive optical splitting components.
3Volume of moving object
If the optical axis of the eyeball-imaging system is made nonparallel to the display optical system, then the apparatus size is reduced, but the imaging range may be affected
Solution Approach 1:
The patent optimizes the specific orientation of the optical axes to achieve local quality improvements. By making the projected line of the finder optical axis substantially parallel to the long side of the imaging plane, the configuration maximizes the effective imaging range in the direction most critical for capturing the user's eye, while allowing apparatus size reduction in other dimensions.
Data Source
AI summary
A display apparatus according to the present invention, includes: a display panel; a display optical system for looking at the display panel; an image sensor for capturing an eye of an user looking at the display panel, the image sensor having a rectangular imaging plane; and an imaging optical system for forming an optical image of the eye on the imaging plane, wherein the imaging optical system has an optical axis that is nonparallel to an optical axis of the display optical system, and a projected line of the optical axis of the display optical system on the imaging plane is substantially parallel to a long side of the imaging plane.