Reflection Polarizer Metallic Line Lattice for LCD Brightness and Mirror Effect
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Solution Overview
Problem
LCD devices face challenges in achieving a good mirror effect when power is intercepted and providing clear display quality with sufficient brightness at bright places due to low luminance efficiency, as conventional reflector films reduce light transmission and absorption, leading to reduced contrast ratios.
Innovation Solution
The implementation of an LCD device with a regularly arranged metallic line lattice on a support acting as an upper reflection polarizer, which enhances light transmission and reflection when power is applied, and functions as a mirror when power is intercepted, using a combination of upper and lower reflection polarizers to optimize light usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional reflector film with a thin metal layer is attached to form a mirror surface, then a good mirror effect is achieved when power is intercepted, but light transmittance is seriously lowered, resulting in insufficient brightness when power is supplied
Solution Approach 1:
The reflector film is segmented into multiple discrete metallic lines arranged in a lattice pattern rather than a continuous metal layer. This segmentation allows light to pass through the gaps between metallic lines while still providing sufficient reflection from the metallic lines themselves, thereby resolving the contradiction between achieving mirror effect and maintaining light transmittance.
Solution Approach 2:
The metallic lines are strategically positioned and dimensioned to provide localized reflection properties. By controlling the width, spacing, and arrangement of individual metallic lines, the structure achieves adequate mirror effect in specific regions while maintaining overall light transmission through the remaining areas, thus balancing brightness and transmittance.
2Illumination intensity
If power supplied to the backlight unit is raised to increase luminance efficiency, then brightness is improved, but battery may be rapidly discharged in mobile displays
Solution Approach 1:
The metallic line lattice structure continuously reflects and redirects light throughout the display, maximizing the utilization of light from the backlight unit. This continuous optical action improves luminance efficiency without requiring increased power input, as the structure optimizes the existing light path rather than adding energy consumption.
Solution Approach 2:
The invention changes the optical parameters of the system by introducing a specific metallic line lattice configuration with controlled line width, spacing, and arrangement. These parameter changes optimize light reflection and transmission characteristics, improving luminance efficiency through structural optimization rather than increased power supply.
3Ease of operation
If a conventional absorption polarizer is used, then polarization function is achieved, but 50% of light is absorbed, lowering luminance efficiency
Solution Approach 1:
The invention replaces the conventional absorption-based polarizer mechanism with a reflection-based metallic line lattice structure. Instead of absorbing light to achieve polarization, the metallic lines reflect light selectively based on their orientation and arrangement, thereby maintaining polarization function while dramatically reducing light loss and improving luminance efficiency.
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 significantly enhances brightness and contrast ratio, allowing for clear display quality even in bright environments while minimizing power consumption by efficiently utilizing light emitted from the backlight unit.
Implementation Method 1
the DBEF reflects the light not passing through the polarizer into a lower direction such that the reflected light is reflected on the reflection plate 30 (FIG. 1) again and then reaches the DBEF with a changed polarization direction
Implementation Method 2
a liquid crystal layer 90 for changing a polarization state of light by changing arrangement of the light passing through the lower polarization plate 70 according to supply of power
Data Source
AI summary
An LCD (Liquid Crystal Display) device includes a backlight unit, a lower polarizer positioned on the backlight unit, a liquid crystal layer positioned on the lower polarizer, and an upper reflection polarizer positioned on the liquid crystal layer. The upper reflection polarizer is configured such that a regularly arranged metallic line lattice is formed on a support. this LCD device may give a good mirror effect when power is intercepted, and also give a clear display with high brightness even at a bright place when power is supplied to operate the LCD device.