Reflective Polarizing Plate with Positive C Phase for LCD Brightness
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Solution Overview
Problem
Conventional liquid crystal display devices face challenges in achieving a complete black state without light leakage due to wavelength dispersion and image quality deterioration, especially in wide viewing angles and large-sized displays, and require re-design of retardation films for phase characteristics when using reflective polarizing plates.
Innovation Solution
A liquid crystal display device incorporating a reflective polarizing plate with positive C phase difference characteristics and a retardation layer with positive A phase difference characteristics, along with an upper polarizing plate, to enhance brightness and viewing angle by compensating for phase differences and controlling wavelength dispersion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a reflective polarizing plate is used to enhance brightness, then brightness is improved, but phase characteristics change requiring re-design of retardation film
Solution Approach 1:
The patent changes the phase difference characteristics parameter of the reflective polarizing plate from conventional negative C phase to positive C phase, which fundamentally alters the optical path and eliminates the need for complex retardation film re-design while maintaining improved brightness
Solution Approach 2:
The patent employs a composite structure combining a reflective polarizing plate with positive C phase characteristics and a retardation layer with positive A phase characteristics, where the interaction between these two optical elements achieves the desired phase compensation without requiring complex individual component designs
2Device complexity
If conventional optical elements are used without considering wavelength dispersion, then device complexity is reduced, but complete black state cannot be achieved due to light leakage
Solution Approach 1:
The patent selects optical elements with specific phase difference characteristics (positive C phase for reflective polarizing plate, positive A phase for retardation layer) that inherently compensate for wavelength dispersion effects, enabling complete black state without requiring complex wavelength-specific designs
Solution Approach 2:
The patent converts the typically harmful wavelength dispersion effect into a beneficial outcome by carefully selecting phase difference characteristics that cause different wavelengths to converge to the same polarization state, thereby achieving wavelength-independent black state performance
3Adaptability or versatility
If liquid crystal display mode is designed for wide viewing angle, then viewing angle is improved, but image quality deteriorates with spots appearing in large-sized displays
Solution Approach 1:
The patent uses a composite optical system comprising a reflective polarizing plate and a retardation layer with specific phase characteristics that work together to maintain uniform image quality across wide viewing angles and large display sizes, preventing spot artifacts while preserving wide viewing angle capability
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 enables improved brightness and a wider viewing angle with reduced light leakage, achieving a stable black state and enhanced image quality across various viewing positions.
Implementation Method 1
the lower polarizing plate is a reflective polarizing plate exhibiting positive C phase difference characteristics
Implementation Method 2
lower polarizing plate that received light
Implementation Method 3
the retardation layer exhibits positive A phase difference characteristics
Implementation Method 4
traverse electric field drive mode liquid crystal display device
Data Source
AI summary
A liquid crystal display comprises a surface light source, a lower polarizing plate disposed on the surface light source, a liquid crystal layer disposed on the lower polarizing plate, a retardation layer disposed on the liquid crystal layer and an upper polarizing plate disposed on the retardation layer, wherein the lower polarizing plate is a reflective polarizing plate exhibiting positive C phase difference characteristics, and the retardation layer exhibits positive A phase difference characteristics.