Birefringent Optical Member for Glasses-Free 3D Display
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Solution Overview
Problem
Glasses-free stereoscopic 3D display devices face issues with adjacent parallax images overlapping due to deteriorated driving characteristics of birefringent materials, leading to image distortion and crosstalk at contact areas between optical lenses and side edges.
Innovation Solution
Optimizing the arrangement of driving electrodes in birefringent materials and using a display device configuration with a polarization controller and optical lenses to control light paths, applying different voltages to maintain or change the polarization direction during 2D and 3D image display periods, thereby enhancing the driving characteristics and preventing crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If adjacent parallax images are displayed using birefringent materials in a glasses-free stereoscopic display device, then 3D stereoscopic images can be displayed without glasses, but the driving characteristics of birefringent materials deteriorate causing adjacent parallax images to overlap and image distortion occurs
Solution Approach 1:
A polarization controller layer is introduced as an intermediary between the display panel and the optical lenses. This polarization controller maintains the polarization state of light during 2D display and enables proper polarization switching during 3D display, preventing image overlap and distortion without compromising the stereoscopic effect
Solution Approach 2:
The patent applies different voltage levels to the birefringent materials at different time periods: a first voltage during 2D image display period and a second voltage during 3D stereoscopic image display period. This parameter change controls the polarization state of the birefringent materials, preventing image distortion and overlap while maintaining display quality
2Adaptability or versatility
If optical lenses are used to refract light paths for 3D stereoscopic image display, then parallax images can be separated for left and right eyes, but image distortion occurs at contact areas between optical lenses and side edges
Solution Approach 1:
A black matrix is introduced as an intermediary element positioned at the side edges of the optical lenses. This black matrix blocks distorted images that occur at the contact areas between optical lenses and prevents crosstalk, while not interfering with the main light paths needed for stereoscopic separation
Solution Approach 2:
The patent converts the harmful distorted images at lens edges into a useful blocking function. By placing black matrices at these locations, the distorted light that would cause crosstalk is intentionally blocked, and this blocking action benefits the overall image quality by preventing adjacent parallax images from overlapping
3Adaptability or versatility
If driving voltages are applied to control polarization direction in birefringent materials, then light paths can be changed for 3D display, but adjacent parallax images overlap when driving characteristics deteriorate
Solution Approach 1:
The patent employs periodic voltage application with distinct time periods: a first voltage applied during 2D image display period and a second voltage applied during 3D stereoscopic image display period. This periodic action ensures proper polarization switching, maintaining image separation reliability while enabling versatile display modes
Solution Approach 2:
The polarization controller serves as an intermediary that mediates between the voltage control system and the birefringent materials. It ensures that voltage changes are properly translated into polarization state changes, maintaining reliable parallax image separation even when driving characteristics vary
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
This solution increases the sharpness and display quality of stereoscopic images by refracting light paths effectively and suppresses image distortion, improving user satisfaction and reliability by blocking distorted images at contact areas.
Implementation Method 1
a polarization control layer disposed on a front surface of the first transparent electrode
Implementation Method 2
applying different voltages to maintain or change the polarization direction during 2D and 3D image display periods, thereby enhancing the driving characteristics
Implementation Method 3
to display 3D stereoscopic images by refracting the display light paths of the 2D images during a 3D stereoscopic image display period
Data Source
AI summary
A display device includes a display panel configured to display 2D images, an optical member configured to display the 2D images displayed on the display panel by maintaining display light paths of the 2D images during a 2D image display period, and to display 3D stereoscopic images by refracting the display light paths of the 2D images during a 3D stereoscopic image display period, and a display driver configured to drive the display panel so that the display panel displays multi-view images in the 2D image display period and the 3D stereoscopic image display period, and to apply driving voltages to the optical member to control operations of the optical member for displaying the 2D images or 3D stereoscopic images.