Wavelength-Selective Transflective Member for LCD Light Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Non-self-emissive display devices, such as LCDs, suffer from low light efficiency due to the absorption of unwanted wavelengths by color filters, which reduces their display quality.
Innovation Solution
Incorporating a wavelength-selective transflective member on the display panel that reflects specific wavelengths and transmits others, along with color filters, to optimize light usage from the backlight unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If color filters are used to transmit light of specific wavelengths, then display quality is improved, but light efficiency is decreased due to absorption of other wavelengths
Solution Approach 1:
The patent converts the harmful absorbed light into a beneficial resource by using a transflective member to reflect the light absorbed by color filters back through the liquid crystal layer to the color filters again. This allows the previously wasted light energy to be utilized for display purposes, thereby improving light efficiency while maintaining display quality.
Solution Approach 2:
The transflective member is positioned to reflect light back before it is completely absorbed by the color filters, allowing the light to undergo a second pass through the liquid crystal layer and color filters. This preliminary reflection action enables reuse of light that would otherwise be lost.
2Loss of energy
If a wavelength-selective transflective member is added to reflect specific wavelengths, then light efficiency is improved, but device complexity increases
Solution Approach 1:
The transflective member serves multiple functions: it acts as a reflector for wavelengths absorbed by color filters, a wavelength selector to maintain color accuracy, and an integrator that works with existing display components (backlight, liquid crystal layer, color filters). This multi-functionality achieves improved light efficiency without proportionally increasing device complexity.
3Loss of energy
If light is reflected back through the liquid crystal layer, then light efficiency increases, but display uniformity may be affected
Solution Approach 1:
The patent applies the transflective member with specific wavelength selectivity tailored to match the absorption characteristics of the particular color filters used in each region of the display. This local optimization ensures that reflected light complements the specific color filter properties, maintaining display uniformity while improving light 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 increases the amount of light incident on color filters, enhancing light efficiency and display quality by effectively utilizing both reflected and transmitted wavelengths.
Implementation Method 1
a wavelength-selective transflective member configured to transmit light of different wavelengths
Implementation Method 2
a wavelength-selective transflective member including a plurality of sub-wavelength selective transflective members, the wavelength-selective transflective member being disposed on the array substrate or the opposite substrate and being configured to transmit light of different wavelengths
Data Source
AI summary
A display device includes a display panel and a backlight unit. The display panel is configured to display an image. The backlight unit is configured to provide light to the display panel. The display panel includes an array substrate including a plurality of pixel areas, an opposite substrate facing the array substrate, a liquid crystal layer disposed between the array substrate and the opposite substrate, and a wavelength-selective transflective member disposed on the array substrate or the opposite substrate.