3D Image Display Luminance Control for Eye-Strain Reduction
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Solution Overview
Problem
Existing three-dimensional display devices have a narrow range for displaying stereoscopic images due to the placement of stereoscopic images between two virtual surfaces, leading to conflicts in physiological factors such as binocular disparity, convergence, and accommodation, resulting in eye strain.
Innovation Solution
A three-dimensional-image display device that includes a display unit, a variable focus lens unit, and a control unit to dynamically adjust the luminance distribution of parallax images based on the position of the stereoscopic image relative to multiple display surfaces, using a variable focus lens to form virtual images on different depth positions and controlling luminance distribution to maintain comfortable viewing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the stereoscopic image is displayed between two virtual surfaces, then the conflicts among physiological factors (binocular disparity, convergence, and accommodation) are suppressed, but the range in which the stereoscopic image can be displayed is narrow
Solution Approach 1:
The display space is segmented into multiple virtual surfaces (first virtual surface, second virtual surface, and third virtual surface) positioned at different depths. By distributing parallax images across these segmented surfaces, the system can display stereoscopic images at various positions without forcing them all between just two surfaces, thereby expanding the display range while maintaining physiological comfort.
Solution Approach 2:
The invention extends the display from a two-surface constraint to a three-surface arrangement in depth space. This dimensional expansion allows stereoscopic images to be positioned not only between the first and second virtual surfaces but also between the second and third virtual surfaces, significantly broadening the accessible display range while preserving the suppression of physiological conflicts.
2Ease of operation
If the luminance distribution is dynamically adjusted based on stereoscopic image position, then the viewing comfort is maintained across various positions, but the device complexity increases
Solution Approach 1:
The control unit pre-establishes the luminance distribution rules for different stereoscopic image positions. By determining in advance how luminance should be distributed across the first, second, and third virtual surfaces based on the stereoscopic image position, the system maintains viewing comfort without requiring complex real-time calculations, thus managing device complexity effectively.
Solution Approach 2:
The control unit continuously monitors the position of the stereoscopic image and dynamically adjusts the luminance distribution of parallax images across the multiple virtual surfaces accordingly. This feedback mechanism ensures that viewing comfort is maintained across various positions while the adjustment logic remains manageable through systematic luminance allocation strategies.
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 device enhances the range of stereoscopic image display while reducing eye strain by aligning the perceived depth with the focal point, matching parallax and convergence, and maintaining comfortable viewing conditions across various positions.
Implementation Method 1
a variable focus lens unit in which a focal distance for display light of each of the parallax images switches, and that forms a virtual image of each of the parallax images on each of a plurality of display surfaces positioned in a depth direction
Data Source
AI summary
A three-dimensional-image display device includes a display unit that sequentially displays parallax images; a variable focus lens unit that respectively forms virtual images of each of the parallax images on display surfaces; and a control unit that distributes, in accordance with a position of a stereoscopic image, a luminance of the stereoscopic image to a luminance of the parallax images. In a case in which the position of the stereoscopic image is a first position positioned between a closest display surface and a farthest display surface, the control unit changes, in accordance with the distance between an observer and the stereoscopic image, a distribution ratio for distributing the luminance of the stereoscopic image to the luminance of the parallax images.