Liquid Crystal Display Back Polarizing Plate Contrast Optimization
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Solution Overview
Problem
Existing liquid crystal display devices face a trade-off between achieving high front contrast ratio and maintaining front white brightness, as methods to enhance contrast ratio often result in decreased white brightness.
Innovation Solution
A liquid crystal display device configuration with a front polarizing plate, a liquid crystal cell, and a back polarizing plate, where the back polarizing plate has a lower contrast than the front polarizing plate, and there is substantially no air layer between the back polarizing plate and an optical element with polarization characteristics, enhancing white brightness while maintaining contrast ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the transmittance of the polarizing plate is decreased to enhance the front contrast ratio, then the front contrast ratio is improved, but the front white brightness decreases
Solution Approach 1:
The patent applies local quality by differentiating the contrast characteristics between the front and back polarizing plates. The front polarizing plate is designed with high contrast to enhance the front contrast ratio, while the back polarizing plate is designed with lower contrast to maintain front white brightness. This localized differentiation of optical properties resolves the contradiction by allowing each polarizing plate to have optimized characteristics for its specific function in the light path.
2Stability of the object's composition
If an optical element with polarization characteristics is added to enhance contrast ratio, then the front contrast ratio is improved, but the device complexity increases
Solution Approach 1:
The patent applies universality by designing the back polarizing plate to serve multiple functions: it acts as both a polarizing element and an optical element with polarization characteristics. This multi-functional design enhances the front contrast ratio while avoiding the need for separate additional components, thereby limiting the increase in device complexity.
Solution Approach 2:
The patent merges the function of the back polarizing plate with that of an optical element having polarization characteristics. By combining these two functions into a single component, the patent achieves the desired contrast enhancement without requiring separate elements, thus minimizing the increase in device complexity.
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
This configuration allows for sufficient front contrast ratio and enhanced front white brightness simultaneously, using commercially available polarizing plates and optical elements, and can be implemented in various embodiments to achieve improved display performance.
Implementation Method 1
Liquid crystal display devices are elements that display characters and images using electro-optical characteristics of liquid crystal molecules
Implementation Method 2
a liquid crystal panel having polarizing plates (a front polarizing plate and a back polarizing plate)
Data Source
AI summary
The present invention provides a liquid crystal display device that can achieve sufficient front contrast ratio and front white brightness at the same time. The present invention is a liquid crystal display device including a front polarizing plate, a liquid crystal cell, a back polarizing plate, and an optical element having polarization characteristics, which are arranged in the stated order, wherein the back polarizing plate has a lower contrast than the front polarizing plate, and there is substantially no air layer between the back polarizing plate and the optical element having polarization characteristics.