Autostereoscopic Display Resolution via Electro-Optic Birefringent Layers
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Solution Overview
Problem
Conventional autostereoscopic displays using lenticular methods suffer from reduced resolution when switching between 2D and 3D modes, and existing directional backlights are complex and large in size, making them difficult to manufacture and integrate effectively.
Innovation Solution
An autostereoscopic display employing a controller, display panel, polarizer, polarization switching controller, and electro-optical birefringent layers with lenticular lenses arranged in a specific pitch and displacement configuration, allowing for full-resolution 3D imaging and seamless 2D-3D mode conversion without compromising resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a lenticular lens array is used to separate viewing zones for stereoscopic imaging, then 3D effect is achieved, but the resolution of each eye image becomes half of the panel resolution
Solution Approach 1:
The patent employs frame-sequential operation where left and right eye images are displayed alternately at high frame rates. The liquid crystal layer switches between different optical states in synchronization with the displayed frames, directing left eye images to the left viewing zone and right eye images to the right viewing zone during respective time periods, thereby achieving full resolution 3D imaging through periodic temporal multiplexing
Solution Approach 2:
The patent uses a dynamic liquid crystal layer with controllable optical properties that can change its refractive index and optical axis orientation in response to applied voltages. This dynamic control allows the system to alternately direct different eye images to appropriate viewing zones during frame-sequential operation, enabling full-resolution stereoscopic display without the resolution loss inherent in static lenticular methods
2Measurement precision
If frame-sequential operation is used to display full-resolution stereoscopic images, then resolution is maintained, but a switching unit and synchronization mechanism are required
Solution Approach 1:
The patent integrates the frame-sequential switching function directly into the liquid crystal layer of the display panel itself. The liquid crystal layer's inherent ability to change optical properties under voltage control serves dual purposes: maintaining image quality and performing the switching function needed for frame-sequential operation, thereby eliminating the need for separate mechanical switching units and reducing overall system complexity
Solution Approach 2:
The liquid crystal layer performs self-switching based on voltage signals applied to different pixel regions. By controlling the optical state of liquid crystal molecules in response to display content, the display panel automatically directs appropriate images to appropriate viewing zones without requiring external mechanical switches or complex synchronization mechanisms, achieving resolution maintenance through self-contained optical control
3Measurement precision
If a directional backlight is used to enable full-resolution 3D display, then viewing zone positioning is improved, but the backlight becomes thick and complicated to manufacture
Solution Approach 1:
The patent replaces the mechanical directional backlight system with an optical control mechanism using a liquid crystal layer. Instead of using physically thick directional backlight units with complex light guiding structures, the invention uses electrically controllable liquid crystal molecules to dynamically direct light to appropriate viewing zones, substituting a manufacturable electro-optical system for a complex mechanical optical system
Solution Approach 2:
The patent changes the optical parameters of the liquid crystal layer by applying voltages that alter the refractive index and optical axis orientation of liquid crystal molecules. This parameter control allows the same thin liquid crystal layer to dynamically direct light to different viewing zones for different eye images, achieving precise viewing zone positioning without the thickness and manufacturing complexity of directional backlights
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 a thin, efficient autostereoscopic display that maintains full resolution in both 2D and 3D modes, simplifies manufacturing, and allows for easy conversion between modes, addressing the limitations of existing technologies.
Implementation Method 1
a first electro-optical birefringent layer which optical birefringence is particularly characterized with a direction of optical axis
Implementation Method 2
including a plurality of first lenticular lenses separated by a predetermined pitch
Implementation Method 3
a polarizer for polarizing light emitted from the display panel to a first polarization
Implementation Method 4
a polarization switch for selectively converting the light with the first polarization into light with a second polarization in response to the electrical control
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
A high-resolution autostereoscopic display is provided. The autostereoscopic display includes a controller (131); a display panel (121) receiving an image signal from the controller (131), forming an image, and including pixels and an inactive area between the pixels; a polarizer (124) polarizing light emitted from the display panel (121) to have a first polarization; a polarization switching controller (130); a polarization switch (125) selectively converting the light with the first polarization into light with a second polarization in response to the electrical control of the polarization switching controller (130); a selection controller (129); a first electro-optical birefringent layer (126) having an optical axis that direction is changed by an electrical control of the selection controller (129) and including a plurality of first lenticular lenses (126a) separated by a predetermined pitch; and a second electro-optical birefringent layer (127) having an optical axis that direction is changed by the electrical control of the selection controller (129), includes a plurality of second lenticular lenses that are arranged with the same pitch as the first lenticular lenses (126a) are and shifted by half the pitch from the first lenticular lenses (126a).