Cascaded Post Spacer Design for Light Modulation Panel Cell Gap
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current light modulation panels with liquid crystal dyes face limitations in achieving a large cell gap due to the maximum height constraints of post spacers, leading to restricted transmissivity regulation and increased costs, as well as stability issues from crystallization of dyes at varying temperatures.
Innovation Solution
A light modulation panel design featuring cascaded post spacers on opposing substrates, with identical heights and rectangular surfaces, to maintain a cell gap greater than or equal to 10 μm, ensuring uniform distribution and stability, and a bonding layer with an annular adhesive tape to address surface unevenness and pressure issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If single post spacers are used to maintain cell gap, then the structure is simple, but the maximum cell gap is limited to less than 10 μm
Solution Approach 1:
The spacer structure is divided into two segments: a first post spacer formed on the first substrate and a second post spacer formed on the second substrate. These two segments work together to achieve a total cell gap of 10 μm or more, overcoming the limitation of single post spacers that could only maintain gaps of less than 10 μm.
Solution Approach 2:
The first post spacer and second post spacer are arranged in a nested configuration where they face each other across the liquid crystal layer. The first post spacer has a first surface facing the second substrate, and the second post spacer has a second surface facing the first substrate, creating a coordinated dual-layer spacer system.
2Length of stationary object
If post spacer height is increased to achieve larger cell gap, then the cell gap increases, but the post spacer becomes unstable and may fall off
Solution Approach 1:
By dividing the spacer function into two separate post spacers of moderate height (each less than 10 μm), the system achieves a total cell gap of 10 μm or more while maintaining the stability of individual spacers. Neither spacer needs to be excessively tall, preventing fall-off issues.
Solution Approach 2:
The first post spacer and second post spacer are formed on opposite substrates with specific height characteristics optimized for their respective positions. This local optimization allows each spacer to maintain stability while contributing to the overall large cell gap requirement.
3Adaptability or versatility
If liquid crystal dye concentration is increased to improve transmissivity regulation, then the transmissivity control improves, but the dye crystallizes at varying temperatures
Solution Approach 1:
The system achieves improved transmissivity regulation by adjusting the cell gap parameter (to 10 μm or more) rather than increasing dye concentration. This parameter change allows for better optical control while maintaining dye stability across varying temperatures and preventing crystallization.
4Manufacturing precision
If annular adhesive tape is used to bond substrates, then surface unevenness is compensated, but the bonding structure becomes more complex
Solution Approach 1:
The annular adhesive tape is applied locally at the peripheral region of the substrates rather than across the entire surface. This localized bonding approach compensates for surface unevenness and prevents black spot defects in the display area while minimizing the increase in overall structural complexity.
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 formation of a light modulation panel with a large and stable cell gap, improving transmissivity control and reducing costs by maintaining spacer stability and preventing defects like black spots and crystallization, while enhancing the durability and sound/heat insulation of the device.
Implementation Method 1
The light modulation panel with liquid crystal dyes switches between a bright state and a dim state using a selective light absorption feature of dichroic dye molecules in a liquid crystal.
Data Source
AI summary
A manufacturing method of a light modulation panel, a light modulation panel and a light modulation device. The light modulation panel comprises: a first substrate and a second substrate arranged in align with each other, a liquid crystal filled between the first substrate and the second substrate, and spacer structures located between the first substrate and the second substrate and configured to maintain a cell gap of the liquid crystal; wherein the spacer structures comprise a first post spacer and a second post spacer arranged in a cascaded manner, the first post spacer is arranged on a side of the first substrate close to the second substrate, the second post spacer is arranged on a side of the second substrate close to the first substrate.