Wire Grid Substrate for Thin Liquid Crystal Panels
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Solution Overview
Problem
Conventional liquid crystal display panels face challenges in achieving high color gamut while maintaining a thin profile, as the thickness of the color filter and polarizer combination increases, making it difficult to match the band-pass peak with quantum dot backlight technology, leading to reduced color reproduction and increased panel thickness.
Innovation Solution
A substrate with a wire grid layer comprising a dielectric and metal layer, arranged in a periodic structure with intersecting metal bars, functions as a color filter, polarizer, and metal electrode, allowing for precise matching of the band-pass width with the quantum dot backlight peak, thereby enhancing color reproduction and reducing panel thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional color filter and polarizer combination is used, then color saturation and reproduction are improved, but panel thickness increases
Solution Approach 1:
The patent combines the functions of color filter, polarizer, and metal electrode into a single integrated substrate structure. The wire grid layer with periodic metal bars serves simultaneously as polarizer and color filter, eliminating the need for separate color filter layer and reducing overall panel thickness while maintaining color saturation and reproduction capabilities
Solution Approach 2:
The substrate is designed to perform multiple functions simultaneously: the wire grid layer acts as both polarizer and color filter, the periodic metal bar structure provides both polarization and wavelength selection, and the substrate serves as both structural support and optical functional element, thereby reducing the number of separate components needed
2Illumination intensity
If color filter thickness is increased to match band-pass peak with quantum dot backlight, then color reproduction is improved, but panel thickness increases
Solution Approach 1:
The patent changes the structural parameters of the wire grid layer, specifically the period, width, and spacing of the metal bars, to control the optical properties. By adjusting these geometric parameters, the band-pass characteristics are optimized to match the quantum dot backlight peak without increasing material thickness, achieving high color reproduction in a thin profile
3Illumination intensity
If conventional color filter structure is used, then transmission rate within band-pass width is maintained, but manufacturing complexity increases
Solution Approach 1:
The patent extracts the color filtering function from the traditional separate color filter layer and integrates it into the wire grid polarizer structure. This eliminates the need for complex multi-layer color filter fabrication processes while maintaining high transmission rate within the band-pass width, simplifying the overall manufacturing process
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 proposed solution significantly enhances color reproduction by matching the band-pass width with the quantum dot backlight peak, while reducing the overall thickness of the liquid crystal panel, outperforming conventional configurations by maintaining high transmission rates and extinction ratios.
Implementation Method 1
a wire grid layer arranged on the glass substrate... the metal layer includes a plurality of first metal bars and a plurality of second metal bars... the first metal bars are parallel to and are spaced apart from each other
Implementation Method 2
the wire grid layer... functions as a color filter, polarizer, and metal electrode, allowing for precise matching of the band-pass width with the quantum dot backlight peak
Implementation Method 3
the wire grid layer... functions as a color filter, polarizer, and metal electrode... maintaining high transmission rates and extinction ratios
Implementation Method 4
a dielectric layer arranged on one side of the glass substrate; a metal layer arranged on the dielectric layer... a reflective rate of the second dielectric layer is greater than the reflective rate of the first dielectric layer and the third dielectric layer
Data Source
AI summary
A substrate of liquid crystal panels includes a glass substrate, and a wire grid layer including a dielectric layer arranged on one side of the glass substrate, and a metal layer on the dielectric layer. The metal layer includes a number of first metal bars and a number of second metal bars. The second metal bars are configured to divide the metal layer into a first area, a second area, and a third area cyclically arranged. The first metal bars are arranged within the first area, the second area, and the third area in sequence, and the first metal bars are parallel to and are spaced apart from each other. The first metal bars within the different areas respectively include a first period, a second period, and a third period different from each other. In addition, the present disclosure also relates to a liquid crystal panel.