Liquid Crystal Display Light Conversion Member Luminance
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Solution Overview
Problem
Current liquid crystal display devices face challenges in achieving high front surface luminance while reducing manufacturing costs, particularly due to complex structures and high costs associated with multilayer constitutions for improving light utilization efficiency and color reproducibility.
Innovation Solution
A liquid crystal display device configuration that includes a backlight unit with a light source emitting unpolarized light in the ultraviolet to blue spectrum, a selective reflection member that reflects a majority of this light, and a light conversion member with aligned fluorescent materials emitting linearly polarized blue, green, and red light, optimizing light utilization and reducing the number of components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a multilayer optical sheet member is provided between the backlight and the backlight-side polarizing plate to improve light utilization efficiency, then front surface luminance is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines multiple optical functions into a single integrated optical sheet member. This member simultaneously performs light recycling, polarization control, and wavelength selection functions that would traditionally require separate multilayer components. By merging these functions, the patent reduces device complexity while maintaining improved front surface luminance through enhanced light utilization efficiency.
Solution Approach 2:
The optical sheet member is designed with multi-functional capabilities: it acts as a polarizing plate, a wavelength selective filter, and a light recycling element all in one component. This universal design allows the single member to perform multiple optical functions, reducing the need for separate components and simplifying the overall device structure while improving luminance performance.
2Ease of manufacture
If multiple optical members are integrated to reduce cost, then manufacturing cost decreases, but light utilization efficiency and color reproducibility may be compromised
Solution Approach 1:
By merging multiple optical functions into one integrated sheet member, the patent reduces the total number of components that need to be manufactured and assembled. This integration lowers manufacturing costs while the preserved optical functions ensure that light utilization efficiency remains high, as the integrated member maintains the necessary light recycling and polarization control capabilities.
3Illumination intensity
If a specific optical sheet member with complex multilayer constitution is used to improve light utilization, then front surface luminance is enhanced, but the number of members increases
Solution Approach 1:
The patent consolidates multiple optical members into a single integrated optical sheet member that performs the functions of light recycling, polarization control, and wavelength selection. This reduction in the number of members simplifies the optical path while maintaining improved front surface luminance through the integrated member's enhanced light utilization capabilities.
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 enhances front surface luminance by increasing light utilization ratio and reduces manufacturing costs through simplified member integration, improving both power efficiency and color reproducibility.
Implementation Method 1
a selective reflection member that reflects a majority of this light, and a light conversion member with aligned fluorescent materials emitting linearly polarized blue, green, and red light
Implementation Method 2
a light conversion member with aligned fluorescent materials emitting linearly polarized blue, green, and red light
Implementation Method 3
a light conversion member with aligned fluorescent materials emitting linearly polarized blue, green, and red light
Data Source
AI summary
A liquid crystal display device, in which a backlight unit, a light conversion member, a selective reflection member, a liquid crystal cell, and a display-side polarizer are disposed in this order, the backlight unit includes a light source that emits unpolarized light having a light emission central wavelength in a wavelength range of 300 nm to lower than 430 nm, the selective reflection member reflects 60% to 100% of the unpolarized light entering the selective reflection member and transmits at least some of light in a wavelength of higher than 430 nm to 650 nm, and the light conversion member includes an aligned fluorescent material that emits blue, green and red light which are linearly polarized in a vibration direction parallel to an absorption axis of the display-side polarizer, is improved in terms of the front surface luminance.