Partitioned Backlight Autostereoscopic Display for Crosstalk Control
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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 control the projection of left and right eye parallax images, forming a wider eye box array with the use of an imaging semi-reflective mirror and a control operation module to adjust backlight sources based on eye positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
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 properly, 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 location that would otherwise require excessive linear distance, thereby solving the space occupation problem while maintaining proper real image formation
Solution Approach 2:
The off-axis dual mirror module acts as an intermediary between the backlight source and the imaging concave mirror. These mirrors redirect and condition the light path, enabling the system to achieve the necessary optical path length for real image formation without requiring the same linear distance in the physical layout, thus resolving the contradiction between image formation requirements and space constraints
2Reliability
If the display panel response time is increased to reduce afterimages and crosstalk, then image quality improves, but the switching speed between left and right eye images decreases
Solution Approach 1:
The patent divides the backlight source into multiple independent controllable units (first backlight source and second backlight source) that can be switched independently. This segmentation allows different regions of the backlight to be activated for different eyes, enabling faster effective switching between left and right eye images while maintaining image quality through selective illumination rather than requiring the entire display panel to switch slowly
3Device complexity
If a conventional single backlight source is used, then the device structure is simpler, but the eye box array is insufficient and image quality is compromised
Solution Approach 1:
The backlight source is segmented into multiple independent controllable units (first and second backlight sources) that can be selectively activated. Each backlight source corresponds to different eye box regions, creating a sufficient eye box array that improves image quality and viewing experience while maintaining reasonable device complexity through modular design
Solution Approach 2:
The system implements dynamic control of multiple backlight sources based on detected eye positions. The control module dynamically switches between different backlight sources and display regions according to real-time eye tracking data, optimizing the eye box array configuration adaptively to maintain high image quality without requiring a permanently complex static structure
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 images without afterimages and crosstalk, enabling high-quality autostereoscopic vision by providing a wide field of view, and effective autostereoscopic display.
Implementation Method 1
The first mirror and the second curved mirror sequentially reflect the backlight beam to form a directional backlight beam
Implementation Method 2
the image of the display panel 03 forms a corresponding virtual image behind the imaging concave mirror 5, and the backlight source 01 forms a real image of the backlight source on the optical path in front of the imaging concave mirror 5
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 partitioning backlight is adapted to the use of an imaging semi-reflective mirror. In the autostereoscopic display device with partitioning backlight, a display includes a main display module and a light shield module. The light shield module is stacked with the light incident side or the light exit side of the main display module. The display defines a plurality of regions, and the plurality of regions display time-divisionally and are collocated with a plurality of backlight sources to perform the corresponding switching, thereby achieving the effect of displaying partitioned image. The problem that the afterimages and the crosstalk arise from the insufficient response speed of the main display module when a left eye parallax image and a right eye parallax image are quickly switched is solved, and the brightness of the image during displaying may be adjusted by changing the display time of the display regions.