Autostereoscopic Backlight Real-Imaging With Folded Optical Path
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Solution Overview
Problem
Conventional autostereoscopic displays face challenges due to the required distance between the backlight source and imaging concave mirror, limited display panel response time, leading to afterimages and crosstalk.
Innovation Solution
An autostereoscopic display device incorporating an off-axis dual mirror module, a display module with time-divisional switching, and an eye tracking module to form a virtual image of the backlight source array, allowing for a real image to be projected within the focal length of the imaging concave mirror, and using a light shield module to prevent afterimages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the distance between the backlight source and the imaging concave mirror is increased to form a real image, then the real image can be formed in front of the mirror, but the device occupies more space and becomes more difficult to fit in limited dashboard space
Solution Approach 1:
The patent introduces an off-axis dual mirror module that redirects the optical path in a different spatial dimension. By using two mirrors positioned at angles to the optical axis, the system effectively folds the light path, allowing the real image to be formed at a position that would otherwise require excessive linear distance, thereby solving the space occupation problem while maintaining proper image formation geometry
2Reliability
If the display panel response time is increased to reduce afterimages, then image quality improves, but the switching speed between left and right eye images decreases, affecting 3D effect
Solution Approach 1:
The patent employs a light shield module that actively blocks light during the display panel's response transition period. By introducing this preliminary protective action before the image switching is complete, the system prevents afterimages from forming while maintaining fast switching speeds, as the light shield compensates for the panel's finite response time rather than requiring slower switching
3Reliability
If a directional backlight source array is used to improve 3D image quality, then left and right eye parallax images can be formed, but the system complexity increases with multiple mirrors and modules
Solution Approach 1:
The patent combines multiple functional modules into an integrated system where the off-axis dual mirror module, light shield module, and display module work together as a unified optical assembly. The mirrors serve dual purposes of redirecting light and forming images, while the light shield is integrated with the display module structure, reducing the overall system complexity despite maintaining high 3D image quality through coordinated operation of all components
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 enables bright and clear 3D imaging without afterimages or crosstalk by optimizing the distance and response time, allowing for wider viewing angles and dynamic eye tracking.
Implementation Method 1
The off-axis dual mirror module includes a first mirror and a second curved mirror. The first mirror and the second curved mirror sequentially reflect the backlight beam to form a directional backlight beam.
Implementation Method 2
the image beam is reflected by an imaging concave mirror 5. The imaging concave mirror 5 is a reflective mirror with a concave surface.
Implementation Method 3
An imaging semi-reflective mirror is configured to partially reflect the image beam from the imaging concave mirror to the eyes of a viewer and to facilitate the light of the scenery in front of the viewer to partially transmit to the eyes of the viewer.
Implementation Method 4
the directional backlight source array projects a directional backlight beam B on the display panel 03. The display panel 03 quickly switches between left eye parallax image and right eye parallax image, and after the directional backlight beam B passes through the display panel 03, a directional image beam D with image information is formed.
Data Source
AI summary
An autostereoscopic display device with backlight real-imaging is adapted to an imaging semi-reflective mirror. In the autostereoscopic display device with backlight real-imaging, a backlight module collocates with an off-axis dual mirror module to generate a directional backlight beam in smaller space. The equivalent distance between the backlight module and an imaging concave mirror is greater than the focal length of the imaging concave mirror, and the eye box array of the real image of the backlight module is generated by the imaging concave mirror. According to the position of an eye movement, backlight sources are switched to facilitate an image beam to cross at the corresponding small eye box of the eye box array. The plurality of small eye boxes are used to correspond to one eye to improve the tracking buffer when the eye moves quickly and to avoid image interruption.