Viewing Angle Control With Asymmetric Anchoring for Display Privacy
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Solution Overview
Problem
Existing privacy devices in display devices often compromise brightness in normal display mode or fail to provide adequate privacy in privacy mode, necessitating an improvement in their performance.
Innovation Solution
A viewing angle controlling device comprising a first and second substrate, a viewing angle controlling medium with a liquid crystal layer, and alignment layers with differing anchoring strengths, allowing for switching between sharing and privacy modes by adjusting the voltage difference across electrodes to control liquid crystal molecule alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional privacy devices are applied to display devices, then privacy function is provided, but display brightness in normal mode becomes insufficient
Solution Approach 1:
The patent applies local quality by creating different anchoring strengths at different locations within the liquid crystal layer. The first alignment layer has a first anchoring strength while the second alignment layer has a second anchoring strength that is different from the first. This spatial variation in anchoring strength allows the liquid crystal molecules to exhibit different alignment behaviors in different regions, enabling the device to maintain high brightness in normal viewing mode while providing effective privacy protection when viewed from angled positions.
2Object-affected harmful factors
If privacy devices are applied to display devices, then privacy function is provided, but privacy performance is not good enough
Solution Approach 1:
The patent employs parameter changes by varying the anchoring strength parameter across different regions of the liquid crystal layer. By controlling the anchoring strength of alignment layers differently, the liquid crystal molecules can be made to reorient at specific threshold voltages. This parameter variation enables more reliable and controllable privacy performance, as the device can switch between transparent and privacy modes more effectively based on the viewing angle and applied voltage.
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 device maintains normal display brightness in sharing mode while significantly reducing luminance at large viewing angles in privacy mode, effectively providing anti-peeping functionality.
Implementation Method 1
a first alignment layer disposed between the first substrate and the viewing angle controlling medium and having a first anchoring strength, a second alignment layer disposed between the second substrate and the viewing angle controlling medium and having a second anchoring strength
Implementation Method 2
allowing for switching between sharing and privacy modes by adjusting the voltage difference across electrodes to control liquid crystal molecule alignment
Data Source
AI summary
A viewing angle controlling device includes a first substrate, a second substrate disposed opposite to the first substrate, a viewing angle controlling medium disposed between the first substrate and the second substrate, a first alignment layer disposed between the first substrate and the viewing angle controlling medium and having a first anchoring strength, a second alignment layer disposed between the second substrate and the viewing angle controlling medium and having a second anchoring strength, a first polarizer, and a compensation layer disposed between the first polarizer and the viewing angle controlling medium. The first substrate is disposed between the first polarizer and the first alignment layer. The first anchoring strength is less than the second anchoring strength.