Dichroic Dye Liquid Crystal Display Panel Eliminating Polarizer
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Solution Overview
Problem
Conventional liquid crystal display panels have low optical efficiency due to the use of a color filter substrate that allows only a portion of light to pass through, requiring a polarizer and increasing manufacturing costs and backlighting brightness.
Innovation Solution
A color liquid crystal display panel incorporating a dichroic dye in a liquid crystal material that absorbs specific wavelengths of light, eliminating the need for a conventional polarizer and color filter substrate, and utilizing multiple layers of liquid crystal cells with different absorption spectra to achieve full color display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a color filter substrate and polarizer are used to achieve full color display, then color displaying capability is improved, but light transmittance and optical efficiency deteriorate
Solution Approach 1:
The patent extracts and eliminates the polarizer and color filter substrate from the conventional LCD structure. Instead of using these separate components, the invention incorporates dichroic dyes directly into the liquid crystal composition, allowing the liquid crystal layer itself to perform both the polarization and color filtering functions that were previously required from separate components.
Solution Approach 2:
The patent merges the functions of the polarizer, color filter substrate, and liquid crystal layer into a single integrated system. The dichroic dye-containing liquid crystal layer simultaneously performs light polarization and wavelength-selective absorption, combining multiple functions that were previously distributed across separate components.
2Ease of manufacture
If a color filter substrate and polarizer are used to achieve full color display, then color displaying capability is improved, but manufacturing cost deteriorates
Solution Approach 1:
The patent removes the color filter substrate and polarizer from the manufacturing process. By eliminating these separate components and their associated coating, exposure, and development processes, the invention simplifies the manufacturing workflow and reduces production costs while maintaining full color display capability.
Solution Approach 2:
The liquid crystal composition is designed to perform multiple functions simultaneously: it acts as the liquid crystal medium for switching, contains dichroic dyes for color generation, and eliminates the need for separate polarizer and color filter components. This multi-functionality reduces the number of manufacturing steps and lowers overall production cost.
3Ease of manufacture
If a polarizer and color filter substrate are used, then color displaying is achieved, but the number of manufacturing processes increases
Solution Approach 1:
The patent combines the liquid crystal material, dichroic dyes, and alignment functions into a single integrated composition that is injected into the cell in one step. This eliminates the separate coating, exposure, and development processes that were previously required for the color filter substrate, as well as the separate polarizer assembly step.
Solution Approach 2:
The invention extracts and eliminates the complex multi-step manufacturing process for the color filter substrate (coating, exposure, development) and the polarizer assembly process. By incorporating all necessary functions into the liquid crystal composition itself, the manufacturing process is simplified to primarily involve liquid crystal injection and sealing.
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
Enhances light transmittance and optical efficiency by selectively absorbing light from the backlight, reducing the need for high backlight brightness and lowering manufacturing costs while achieving full color display without a polarizer.
Implementation Method 1
The dichroic dye of each of the liquid crystal cells absorbs a light of a predetermined range of wavelength
Implementation Method 2
application of electricity is selectively carried out to control the liquid crystal molecules to change direction in order to refract out light emitting from the backlight module
Implementation Method 3
control the liquid crystal molecules to change direction in order to refract out light emitting from the backlight module for generating images
Data Source
AI summary
The present invention provides a color liquid crystal display panel, which includes: a plurality of mutually parallel layers of liquid crystal cells (2) and bonding members (8) bonding the plurality of layers of liquid crystal cells (2). Each of the liquid crystal cells (2) includes a thin-film transistor substrate (20), a package substrate (30), and a dye-liquid crystal layer (40) sealed between the thin-film transistor substrate (20) and the package substrate (30). The dye-liquid crystal layer (40) includes a liquid crystal material and a dichroic dye. The dichroic dye of each of the liquid crystal cells (2) absorbs light of a predetermined range of wavelength. The plurality of layers of liquid crystal cells (2) respectively absorbs lights of different ranges of wavelength. The present invention includes a dichroic dye combined in a liquid crystal material in order to use the dichroic dye to absorb light of some colors thereby achieving color displaying without using a conventionally used polarizer and manufacture of a color filter substrate, so that the manufacture cost of and the requirement for backlighting brightness by the liquid crystal display panel can both be reduced.