Antiglare Layer Haze Control for IPS LCD Contrast
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Solution Overview
Problem
Liquid crystal display devices, particularly in IPS-mode, face issues with light leakage and reduced dark room contrast due to insufficient antireflection performance, especially when antiglare films with inadequate light-blocking properties are used.
Innovation Solution
A liquid crystal display device configuration that includes a protective film, polarizing films, an optical compensation region, and an antiglare layer with specific haze values for internal and surface scattering, along with a low refractive index layer, to minimize light leakage and maintain high contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an antiglare film is applied to prevent reflection of outside light, then antireflection performance is improved, but dark room contrast is reduced
Solution Approach 1:
The patent applies an antiglare layer with specifically controlled haze values (internal scattering: 5-35%, surface scattering: 1-10%) to balance antireflection performance and dark room contrast. By precisely adjusting the scattering parameters of the antiglare layer, the patent achieves effective reflection prevention while minimizing impact on contrast ratio.
Solution Approach 2:
The patent uses a composite structure combining a transparent support, antiglare layer, and low refractive index layer. This composite material design allows the system to achieve both antireflection and high contrast performance by leveraging the different properties of each layer: the transparent support provides structural integrity, the antiglare layer provides controlled scattering, and the low refractive index layer minimizes reflection.
2Adaptability or versatility
If optical compensation material is disposed between liquid crystal layer and polarizing plate, then color tone and viewing angle are improved, but device complexity increases
Solution Approach 1:
The patent integrates the optical compensation function into the existing protective film structure, making the protective film serve dual purposes: protection and optical compensation. This multi-functionality approach improves viewing angle characteristics without adding separate compensation components, thereby avoiding increased device complexity.
3Illumination intensity
If IPS-mode liquid crystal display is used to enhance brightness, then display quality is improved, but light leakage in oblique direction occurs
Solution Approach 1:
The patent converts the harmful light leakage issue into a beneficial feature by using the same IPS-mode liquid crystal alignment that causes light leakage to achieve excellent viewing angle characteristics and color reproduction. The low refractive index layer is specifically designed to work with the IPS-mode alignment to suppress oblique light leakage while maintaining the brightness advantages.
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 configuration significantly improves display quality and viewing angles while maintaining minimal reduction in dark room contrast, ensuring effective antireflection performance.
Implementation Method 1
the antiglare layer has a haze value attributable to internal scattering of from 5 to 35%
Implementation Method 2
a haze value attributable to surface scattering of from 1 to 10%
Implementation Method 3
a low refractive index layer having a refractive index lower than that of the antiglare layer
Implementation Method 4
at a black display, liquid crystal molecules in the liquid crystal layer are aligned in parallel with surfaces of said pair of substrates
Implementation Method 5
a first polarizing film; a second polarizing film
Data Source
AI summary
A liquid crystal display device comprising: a first protective film; a first polarizing film; an optical compensation region; a liquid crystal cell comprising a liquid crystal layer and a pair of substrates sandwiching the liquid crystal layer; a second polarizing film; and a second protective layer, in this order, wherein at a black display, liquid crystal molecules in the liquid crystal layer are aligned in parallel with surfaces of said pair of substrates, an antiglare layer is provided to at least one of the first protective film and the second protective layer, and the antiglare layer has a haze value attributable to internal scattering of from 5 to 35%, and a haze value attributable to surface scattering of from 1 to 10%.