Parallax Barrier 3D Display Eye Tracking Crosstalk
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Solution Overview
Problem
Conventional parallax-barrier-type 3D display devices suffer from crosstalk and Moire phenomena due to incomplete separation of light rays for left-eye and right-eye images, leading to ghost images and deterioration of the display effect.
Innovation Solution
A 3D display device with a parallax barrier layer that forms a light-shielding stripe pattern, which is adjusted based on the positions of a viewer's eyes using a tracing unit, determining unit, and controlling unit to ensure precise separation of imaging regions, reducing crosstalk and Moire by translating the light-shielding stripe pattern.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a parallax barrier is used to separate light rays for left-eye and right-eye images, then spatial separation of imaging regions is achieved, but crosstalk occurs due to light scattering through openings
Solution Approach 1:
The patent applies the dynamics principle by making the parallax barrier movable rather than fixed. The barrier can dynamically adjust its position and orientation based on the viewer's eye positions, which are detected by a tracing unit. This dynamic adjustment allows the barrier to adapt to different viewing conditions, maintaining optimal light separation while reducing crosstalk that occurs with fixed barriers.
Solution Approach 2:
The patent implements parameter changes by varying the position, orientation, and shape parameters of the parallax barrier according to detected eye positions. The controlling unit adjusts these parameters in real-time based on feedback from the tracing unit, optimizing the barrier's configuration to prevent light scattering and reduce crosstalk for different viewing scenarios.
2Device complexity
If a parallax barrier with fixed stripe pattern is used, then device structure is simple, but Moire phenomenon occurs due to proximity in spatial frequency between barrier and pixel arrangement
Solution Approach 1:
The patent eliminates the Moire phenomenon by making the barrier pattern dynamic rather than fixed. The tracing unit detects eye positions and the controlling unit adjusts the barrier's stripe pattern parameters accordingly, preventing the spatial frequency interference that causes Moire effects while maintaining structural simplicity through software-controlled adjustment.
Solution Approach 2:
The patent addresses Moire phenomenon by changing the spatial frequency parameters of the barrier stripe pattern based on detected eye positions. The controlling unit modifies the pattern parameters in real-time to avoid fixed-frequency interference, thereby eliminating Moire effects while keeping the physical barrier structure relatively simple.
3Manufacturing precision
If light rays are directed towards different directions through fixed parallax barrier, then left-eye and right-eye images are formed, but ghost images appear due to incomplete light ray separation
Solution Approach 1:
The patent reduces ghost images by implementing a dynamic parallax barrier that adjusts its position and orientation based on real-time eye position detection. This dynamic adjustment ensures that light rays are more precisely directed towards the correct eye, improving separation precision and reducing the formation of ghost images compared to fixed barriers.
Solution Approach 2:
The patent employs feedback by using a tracing unit to detect eye positions and feeding this information back to the controlling unit, which then adjusts the parallax barrier configuration. This closed-loop feedback system continuously optimizes light ray separation, reducing ghost images by adapting to actual viewing conditions rather than relying on fixed pre-calculated positions.
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
Effectively suppresses Moire and crosstalk, improving the display effect by adaptively adjusting the light-through openings and light-shielding stripes according to the viewer's eye positions, enhancing the separation of left-eye and right-eye images.
Implementation Method 1
The parallax barrier layer includes a liquid crystal layer, such that the light-shielding stripe pattern is formed by controlling orientation of the liquid crystal layer
Data Source
AI summary
A three-dimensional display device may include a display panel and a parallax barrier layer arranged thereon. The display panel includes left-eye pixels and right-eye pixels arranged alternately in a first direction. The 3D display device may further include: a tracing unit configured to trace positions of both eyes of a viewer; a determining unit coupled to the tracing unit and configured to determine an offset of the light-shield stripe pattern with respect to a predetermined baseline position in a second direction under a predetermined condition, based on the positions of both eyes of the viewer obtained by the tracing unit; and a controlling unit coupled to the determining unit and configured to transmit a control signal to the parallax barrier layer based on the offset obtained, such that the light-shielding stripe pattern formed by the parallax barrier layer is translatable in the second direction based on the offset.