Polarizing Plate for Reflective LCD Color Correction
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Solution Overview
Problem
Highly reflective liquid crystal panels with elevated reflectance cause color sense distortion and visibility degradation due to increased light leakage in the black state, particularly affecting the red and yellow spectrum, as they lack a black matrix (BM) on the upper substrate.
Innovation Solution
A polarizing plate with specific optical characteristics, including a reflectance ratio and transmittance range, is applied to the highly reflective liquid crystal panel to block or absorb long-wavelength light, thereby improving visual sense and correcting color sense distortion. The polarizing plate satisfies the equation 1−0.187×exp(0.22×bs)≤R(450)/R(650)≤1−0.083×exp(0.38×bs) and exhibits a certain range of coordinates in the CIE Lab color space to enhance visibility and luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the reflectance of the liquid crystal panel is increased to improve luminance characteristics, then the luminance and visual quality are improved, but the color sense distortion and visibility degradation in the black state worsen due to increased light leakage
Solution Approach 1:
The patent applies a polarizing plate with specifically controlled optical characteristics including reflectance ratios at different wavelengths (R(450)/R(650) within specified ranges) and CIE Lab color coordinates (a* and b* values within specific ranges). This selectively blocks or attenuates long-wavelength light (red to yellow spectrum) while maintaining short-wavelength light transmission, thereby correcting the color sense distortion caused by high reflectance without significantly compromising luminance.
2Illumination intensity
If the reflectance is increased to enhance display brightness, then the overall visual quality improves, but the light leakage in the black state increases causing visual sense distortion
Solution Approach 1:
The patent implements a polarizing plate with non-uniform optical properties across different wavelength ranges. The plate exhibits wavelength-selective polarization characteristics, with higher attenuation for long wavelengths (650nm) compared to short wavelengths (450nm), as quantified by the controlled R(450)/R(650) ratio. This local differentiation in optical quality allows selective suppression of light leakage in the red-yellow spectrum while preserving display brightness from other wavelength components.
3Productivity
If the black matrix is removed from the upper substrate to improve aperture ratio and luminance, then the luminance characteristics are improved, but the reflectance of external light increases causing visual sense distortion
Solution Approach 1:
The patent introduces a polarizing plate as an intermediary optical element between the liquid crystal panel and the external environment. This mediator selectively interacts with reflected light, applying wavelength-dependent attenuation to the reflected external light. The polarizing plate's specific optical characteristics (reflectance ratios and color coordinates) enable it to suppress the harmful visual effects of external light reflection while allowing the high aperture ratio design to maintain its luminance 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 polarizing plate effectively corrects color sense distortion and improves visibility in highly reflective liquid crystal panels by blocking or absorbing red to yellow light, maintaining optimal luminance and visual performance, even in high reflectance conditions.
Implementation Method 1
The polarizing plate with specific optical characteristics, including a reflectance ratio and transmittance range, is applied to the highly reflective liquid crystal panel to block or absorb long-wavelength light
Implementation Method 2
a reflectance measured at the upper substrate side is generally about 10% at a wavelength of 550 nm
Data Source
AI summary
The present application relates to a polarizing plate and a display device. In the present application, a polarizing plate can be provided, which can be applied to a display device comprising a highly reflective panel to solve disadvantages while maintaining advantages of the device. In the present application, a display device comprising the polarizing plate and the highly reflective panel can also be provided.