Light-Adjusting Glass Polymer Network Mura Defect Control
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Solution Overview
Problem
Current light-adjusting glass technologies, such as PDLC and electrochromic smart glass, fail to provide adequate privacy protection while transmitting light and do not meet the requirements for whole-surface color adjustment in applications like vehicle windows and building glass, as they only adjust between black, bright, and gray states, leading to non-uniform transmittance and Mura defects.
Innovation Solution
A light-adjusting glass with a dye liquid crystal layer and a polymer network that maintains uniform twisting degrees of liquid crystal and dye molecules under electric field changes, using chiral additives and polymerizable monomers to achieve uniform transmittance and prevent Mura defects, allowing for gray scale adjustment and random switching among different gray scales.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If existing light-adjusting glass (PDLC or electrochromic) is used to switch between transparency and haze or black and bright states, then light transmission control is achieved, but uniform transmittance cannot be maintained and Mura defects occur
Solution Approach 1:
The patent changes the molecular configuration parameter of liquid crystal molecules from random or twisted states to a uniform overturned state through electric field control. By applying voltage to overturn the liquid crystal molecules uniformly, the patent achieves consistent light blocking across the entire glass surface, eliminating Mura defects while maintaining transmittance control capability.
Solution Approach 2:
The patent uses a composite liquid crystal composition containing dichroic dye molecules and liquid crystal molecules. This composite material allows the liquid crystal to control both the orientation (for transmittance switching) and the color (through dye absorption), achieving uniform transmittance control without Mura defects by coordinating the behavior of both molecular components under electric field.
2Illumination intensity
If dye liquid crystal layer is used to achieve black state adjustment, then black state purity and response time are improved, but gray scale adjustment and whole-surface color control are not achieved
Solution Approach 1:
The patent implements dynamic control of liquid crystal molecule orientation through variable electric field strength. By adjusting the voltage applied to the liquid crystal layer, the molecules can be overturned to different extents, enabling continuous adjustment from fully transparent through gray scales to fully black states, thus achieving both high black state purity and versatile gray scale control.
Solution Approach 2:
The patent utilizes changes in the orientation parameter of liquid crystal molecules controlled by electric field strength to achieve multiple states. The same liquid crystal layer can be adjusted to different molecular alignment states (parallel, angled, or perpendicular to substrate), providing continuous gray scale adjustment while maintaining the advantages of dye liquid crystal for black state purity.
3Illumination intensity
If liquid crystal molecules are overturned under electric field to control light transmittance, then transmittance adjustment is achieved, but non-uniform twisting degrees cause Mura defects
Solution Approach 1:
The patent achieves homogeneous twisting degree across the entire liquid crystal layer by using uniform electric field application and consistent liquid crystal material properties. The liquid crystal composition and cell structure are designed to ensure that all molecules experience the same overturning conditions, resulting in uniform molecular orientation and consistent light blocking across the full surface, eliminating Mura defects.
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 uniform transmittance and prevents Mura defects, allowing for effective gray scale adjustment and random switching, meeting the requirements for privacy protection and color adjustment in various applications.
Implementation Method 1
The PDLC (polymer dispersed liquid crystal) smart glass may only realize a switching between transparency and haze, and does not block light or insulate heat; the electrochromic smart glass has the problems of a complex film forming process, a long response time (8 to 20 s), bluish light in a dark state and the like. The dye liquid crystal light-adjusting glass realizes a switching between a bright state and a dark state by utilizing a selective absorption of dichroic dye molecules in liquid crystals to light
Implementation Method 2
wherein the dye liquid crystal layer is overturned under a control of an electric field between the first substrate and the second substrate, so as to control a transmittance of light; wherein the dye liquid crystal layer includes a polymer network, which is configured such that when the electric field between the first substrate and the second substrate changes, twisting degrees of liquid crystal molecules in the dye liquid crystal layer are the same, and twisting degrees of dye molecules are the same
Data Source
AI summary
The present disclosure provides a light-adjusting glass and a manufacturing method thereof, and a glass assembly, and belongs to the field of display glass technology. The light-adjusting glass of the present disclosure includes at least one light-adjusting module; the light-adjusting module includes a first substrate and a second substrate opposite to each other, and a dye liquid crystal layer between the first substrate and the second substrate; wherein liquid crystal molecules in the dye liquid crystal layer deflect under a control of an electric field between the first substrate and the second substrate, to control a transmittance of light; wherein the dye liquid crystal layer includes a polymer network, which is configured such that when the electric field between the first substrate and the second substrate changes, twisting degrees of the liquid crystal molecules are identical, and twisting degrees of dye molecules are identical.