3D Display Switching Unit Angled Conductive Layers
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Solution Overview
Problem
Current passive 3D display technologies face issues with halved resolution, decreased brightness, and insufficient vertical viewing angles due to the need for additional retardation and compensation films, which increase manufacturing costs.
Innovation Solution
A 3D image display apparatus with a switching unit comprising substrates and a liquid crystal layer, where the substrates' conductive layers are oriented at an angle, allowing for voltage-controlled alignment of liquid crystal slow axes to achieve optical retardation without additional films, thereby improving viewing angles and reducing manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional liquid crystal switching unit uses retardation film and compensation film, then optical retardation and viewing angle are improved, but manufacturing cost increases
Solution Approach 1:
The patent extracts and eliminates the need for separate retardation film and compensation film by integrating their optical compensation function directly into the liquid crystal switching unit through the angled conductive layer configuration, thereby reducing manufacturing cost while maintaining optical performance
Solution Approach 2:
The patent merges the functions of the liquid crystal switching unit, retardation film, and compensation film into a single integrated structure where the angled conductive layers provide both switching control and optical compensation, eliminating the need for separate films
2Reliability
If space partitioning is used for 3D display, then right-eyed and left-eyed images are separated, but resolution is halved and brightness decreases
Solution Approach 1:
The patent employs time-division multiplexing where the liquid crystal switching unit alternates between different optical states at different time periods, allowing sequential display of right-eyed and left-eyed images without spatial separation, thereby maintaining full resolution and brightness
Solution Approach 2:
The patent uses dynamic control of liquid crystal orientation through time-varying voltages applied to the angled conductive layers, enabling the switching unit to change its optical properties over time rather than relying on static spatial partitioning
3Reliability
If space partitioning is used for 3D display, then stereoscopic vision is achieved, but vertical viewing angle becomes insufficient
Solution Approach 1:
The patent uses time-division switching with periodic voltage application to control liquid crystal orientation, enabling dynamic adjustment of optical properties that maintains wide vertical viewing angles while achieving stereoscopic vision through temporal rather than spatial separation
Solution Approach 2:
The patent changes the optical parameters of the liquid crystal switching unit dynamically by applying different voltages at different time periods, allowing the optical axis and retardation to be adjusted in time to maintain wide viewing angles while providing 3D functionality
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 the generation of specified optical retardation for 3D images without the need for additional retardation or compensation films, enhancing viewing angles and reducing manufacturing costs while maintaining image quality.
Implementation Method 1
the liquid crystal layer is disposed between the first and second substrates and includes a plurality of liquid crystals each having a slow axis. In an initial period, the slow axes of the liquid crystals are aligned in an initial direction by applying no voltage to the first and second conductive layers. In a first period, the slow axes of the liquid crystals are aligned in a first-period-slow-axis direction and thereby having a first angle relative to the polarization axis of the first polarizer by applying the first voltage to the first conductive layer.
Implementation Method 2
To generate an electric field perpendicular to the liquid crystals and thereby changing the tile angles of the liquid crystals, the conventional liquid crystal switching unit needs a retardation film adhered on a side thereof for the compensation of the optical retardation.
Data Source
AI summary
A 3D image display apparatus includes a display unit, a first polarizer with a polarization axis, a second polarizer and a switching unit. The switching unit includes a first substrate, a second substrate and a liquid crystal layer. The first substrate is disposed with a first conductive layer on an inner surface thereof along a first direction and is electrically coupled to a first voltage source. The second substrate is parallel to the first substrate and disposed with a second conductive layer on an inner surface thereof along a second direction and is electrically coupled to a second voltage source. The first and second directions have an angle therebetween. The liquid crystal layer is disposed between the first and second substrates and includes a plurality of liquid crystals each having a slow axis.