Liquid Crystal Capsule Display Merging Contrast and Thickness
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Solution Overview
Problem
Conventional liquid crystal display devices face limitations in contrast ratio, thickness, weight, and manufacturing complexity due to the use of multiple substrates, which hinders the development of thin, lightweight, and flexible displays with improved contrast and image sharpness.
Innovation Solution
A liquid crystal display device incorporating a reduced number of substrates by utilizing liquid crystal capsules with dichroic dyes, where the capsules are aligned to control light transmission and absorption, eliminating the need for upper and lower polarizers and simplifying the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a liquid crystal shutter panel is added below the liquid crystal display panel to improve contrast ratio, then the contrast ratio is improved, but the total thickness and weight of the display device increase
Solution Approach 1:
The patent combines the display panel and shutter panel into a single integrated structure where the liquid crystal layer serves dual functions: displaying images and controlling light transmission for contrast enhancement. This eliminates the need for separate shutter panel substrates, thereby improving contrast ratio while maintaining thin profile.
Solution Approach 2:
The liquid crystal layer is designed to perform multiple functions simultaneously: it acts as both the display medium for image formation and the shutter mechanism for contrast control. This multi-functionality allows the system to achieve high contrast ratio without adding extra substrate layers, thus avoiding increased thickness.
2Illumination intensity
If a liquid crystal shutter panel is added below the liquid crystal display panel to improve contrast ratio, then the contrast ratio is improved, but the total weight of the display device increases
Solution Approach 1:
The patent merges the shutter panel functionality into the existing display panel structure, eliminating the need for separate substrates, color filters, and alignment layers that would otherwise be required. This integration significantly reduces the additional weight that would result from adding a complete shutter panel assembly.
3Illumination intensity
If four substrates are used for the liquid crystal display panel and shutter panel, then the contrast ratio is improved, but the manufacturing process becomes complicated
Solution Approach 1:
The patent consolidates the four-substrate structure into a two-substrate configuration by integrating the shutter function into the display panel. This reduction in substrate count directly simplifies the manufacturing process by decreasing the number of bonding operations, alignment procedures, and quality control steps required.
Solution Approach 2:
The patent divides the liquid crystal layer into distinct functional regions: one region contains liquid crystal molecules for display purposes, while another region contains dichroic dyes for shutter functionality. This segmentation allows each region to be optimized independently while simplifying the overall manufacturing process compared to handling four separate substrates.
4Illumination intensity
If four substrates are used for the liquid crystal display panel and shutter panel, then the contrast ratio is improved, but the device is difficult to apply to flexible display devices
Solution Approach 1:
By integrating the shutter function into the display panel using a reduced substrate count, the patent creates a more flexible structure that can be bent or curved without the mechanical constraints imposed by four rigid substrate layers. This integration enhances adaptability for flexible and wearable display applications.
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 approach enhances the contrast ratio and image sharpness while reducing the device thickness and weight, making it suitable for flexible displays and simplifying the manufacturing process by eliminating the need for additional polarizers.
Implementation Method 1
an electric field is generated between the pixel electrode 34 and the common electrode 46. The plurality of liquid crystal molecules 52 of the liquid crystal layer 50 are realigned according to the electric field
Implementation Method 2
utilizing liquid crystal capsules with dichroic dyes, where the capsules are aligned to control light transmission and absorption
Data Source
AI summary
A liquid crystal display device includes a first substrate and a second substrate facing and spaced apart from each other, each of the first and second substrates including a pixel region; a first liquid crystal layer disposed on an inner surface of the first substrate and including a plurality of first liquid crystal capsules; a second liquid crystal layer disposed on an inner surface of the second substrate and including a plurality of second liquid crystal capsules; and a polarizer disposed between the first liquid crystal layer and the second liquid crystal layer, wherein each of the plurality of first liquid crystal capsules and the plurality of second liquid crystal capsules includes liquid crystal molecules and dichroic dyes.