UV-Blocking Filter for Self-Emissive LCD Light Efficiency
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Solution Overview
Problem
Liquid crystal displays (LCDs) face issues with low light efficiency and narrow viewing angles due to color filters, and ultraviolet light can cause degradation, necessitating a solution that enhances efficiency and reduces cross-talk while preventing UV-induced degradation.
Innovation Solution
A self-emission liquid crystal display design incorporating a light-blocking member, ultraviolet-light blocking filter, emission layers with red, green, and blue phosphors, and quantum dots, along with a backlight assembly using ultraviolet or blue LEDs, and polarizers to improve light efficiency and reduce cross-talk while blocking harmful UV light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If color filters are used in LCD, then color display is achieved, but light efficiency is reduced
Solution Approach 1:
The patent removes the traditional color filter layer from the LCD structure and replaces it with phosphor materials that can be deposited directly on the substrate. This extraction of the color filter function allows light to pass through more efficiently while achieving color display through phosphor emission characteristics.
Solution Approach 2:
The invention changes the material parameter from conventional color filters to phosphor materials with specific emission characteristics. By selecting phosphors with appropriate peak wavelengths and bandwidths, the system achieves both high light efficiency and accurate color reproduction without the light absorption losses inherent in color filter structures.
2Illumination intensity
If ultraviolet backlight is used to provide high light efficiency, then light efficiency is improved, but liquid crystal display cell degradation occurs
Solution Approach 1:
The patent introduces a protective intermediary layer between the ultraviolet backlight and the liquid crystal display cell. This intermediary structure filters out harmful UV wavelengths while transmitting visible light, thereby maintaining high light efficiency from the UV backlight source while preventing degradation of the display cell components.
Solution Approach 2:
The invention converts the potentially harmful ultraviolet radiation into a beneficial light source by using UV-reflective or UV-converting materials. The UV light is either reflected back to the phosphor layer for efficient conversion to visible light or converted to specific visible wavelengths, thereby eliminating the degradation effect while maintaining or improving light efficiency.
3Adaptability or versatility
If self-emission liquid crystal display is implemented, then viewing angle is widened, but cross talk increases
Solution Approach 1:
The patent applies local quality enhancement by using pixel-level phosphor deposition and selective light-blocking structures at the pixel level. This localized approach allows each pixel to emit light independently with precise spatial control, maintaining wide viewing angles while preventing light leakage and cross-talk between adjacent pixels through localized optical confinement.
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 significantly enhances light efficiency, reduces cross-talk, and prevents UV-induced degradation, resulting in a liquid crystal display with improved performance and durability.
Implementation Method 1
an ultraviolet-light blocking filter disposed on the emission layer
Implementation Method 2
an emission layer disposed on the first substrate; the emission layer may include a red emission layer, a green emission layer, and a blue emission layer
Implementation Method 3
a lower polarizer disposed on the ultraviolet-light blocking filter
Data Source
AI summary
A liquid crystal display including a first substrate; a light-blocking member disposed on the first substrate; an emission layer disposed on the first substrate; an ultraviolet-light blocking filter disposed on the emission layer; a lower polarizer disposed on the ultraviolet-light blocking filter; a gate line and a data line disposed on the lower polarizer and substantially perpendicular to each other; a thin film transistor electrically connected to the gate line and the data line; a pixel electrode electrically connected to the thin film transistor; a second substrate disposed facing the first substrate; a common electrode disposed on the second substrate; and a liquid crystal layer interposed between the first substrate and the second substrate.