Liquid Crystal Display Refractive Index Management
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Solution Overview
Problem
Current liquid crystal displays, particularly in the PSVA mode, face challenges with color shift and low transmittance at wide viewing angles due to the reversal of transmittance in the short-wavelength region, leading to a yellowish color issue, which affects user experience.
Innovation Solution
Increasing the average refractive index of the liquid crystal by introducing a chiral agent in the blue region and forming protruding structures within the liquid crystal cell to differentiate the refractive index product for blue, red, and green pixels, preventing transmittance reversal and enabling high transmittance while maintaining blue light brightness, and allowing the display to be flexible.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the average refractive index (Δn) of the liquid crystal is increased to improve transmittance, then the transmittance of the display device is improved, but the transmittance of the short-wavelength region reverses causing a yellowish color problem
Solution Approach 1:
The patent applies local quality by introducing a chiral agent specifically in the blue region (short-wavelength region) of the liquid crystal display. This creates a localized modification where only the blue pixel region contains the chiral agent, which selectively increases the average refractive index in that specific region without affecting other wavelength regions. This resolves the contradiction by allowing increased transmittance locally in the blue region without causing the yellowish color shift that would result from a global increase in refractive index across all regions.
Solution Approach 2:
The patent changes the physical-chemical parameter of the liquid crystal by introducing a chiral agent, which modifies the molecular structure and optical properties of the liquid crystal in the blue region. This parameter change increases the average refractive index specifically in the short-wavelength region, enabling improved transmittance while preventing the transmittance reversal that causes yellowish coloration. The chiral agent alters the refractive index parameter locally, solving the contradiction between improving transmittance and preventing color shift.
2Illumination intensity
If the cell thickness is increased to improve transmittance, then the transmittance is improved, but the amount of liquid crystal increases and cost increases
Solution Approach 1:
Instead of changing the geometric parameter (cell thickness), the patent changes the optical parameter (average refractive index) by introducing a chiral agent. This allows transmittance to be improved through optical property modification rather than increasing the physical thickness of the liquid crystal layer, thereby avoiding the increased consumption of liquid crystal material and associated cost increases.
3Illumination intensity
If the average refractive index (Δn) is increased to improve transmittance, then the transmittance is improved, but the viewing angles deteriorate due to yellowing of the color point
Solution Approach 1:
The patent applies local quality by restricting the chiral agent introduction to specifically the blue pixel region. This localized modification improves transmittance in the short-wavelength region without causing the yellowish color shift that would affect the overall color balance and viewing angle quality. By confining the refractive index enhancement to a specific wavelength region rather than applying it globally, the patent maintains color accuracy and viewing angle performance while achieving improved transmittance.
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 enhances transmittance and prevents color shift, achieving high-visibility large-angle displays without yellowing or greening, and allows the display to be used as a flexible device by restricting liquid crystal flow with protruding structures.
Implementation Method 1
Increasing the average refractive index (Δn) of the liquid crystal by introducing a chiral agent in the blue region
Implementation Method 2
a plurality of protruding structures are formed inside a liquid crystal cell to seal the liquid crystal, restricting the flow of the liquid crystal
Data Source
AI summary
The present invention provides a display and a method of manufacturing the same. The display includes a transistor substrate, a color filter substrate, and a liquid crystal cell. The liquid crystal cell includes a plurality of protrusion structures dividing the liquid crystal cell into a first liquid crystal region and a second liquid crystal region, and the first liquid crystal region and the second liquid crystal region respectively include a first liquid crystal and a second liquid crystal, wherein a product of an average refractive index and a thickness of the first liquid crystal is different from that of the second liquid crystal.