Color Filter Substrate Nanostructure Light Guide Structure
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Solution Overview
Problem
Conventional color filter substrates for TFT-LCD panels face challenges in achieving high color gamut without sacrificing light transmittance, and are prone to display afterimages due to ionic impurities causing direct current bias electric fields.
Innovation Solution
A color filter substrate with a nanostructure layer and a light guide structure layer, where the nanostructure layer features non-periodic nanostructures with grooves and slits that couple and interfere with light to produce specific colors, eliminating the need for ion-containing materials and enhancing color gamut without reducing transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the thickness of the color filter material is increased to achieve higher color gamut, then the color purity is improved, but the light transmittance is reduced
Solution Approach 1:
The patent changes the physical structure from conventional thick color filter material to nanoscale structures (nanoholes, nanowires, or nanopillars) with specific size parameters (50-500 nm diameter, 100-1000 nm depth). This parameter change enables color filtering through optical interference and diffraction effects rather than material absorption, achieving high color gamut with minimal thickness and maximum light transmittance.
Solution Approach 2:
The patent replaces the conventional material-based color filtering mechanism (relying on material thickness and absorption) with a structure-based optical interference mechanism. The nanoscale structures create specific optical paths and interference patterns that generate pure colors without requiring thick material layers, thus substituting a mechanical/material approach with an optical/structural approach.
2Illumination intensity
If conventional color filter material is used to achieve color filtering, then the color gamut is improved, but ionic impurities cause display afterimages
Solution Approach 1:
The patent extracts and removes the problematic organic resin and pigment materials that contain ionic impurities. Instead, it uses inorganic nanoscale structures (metal oxides like TiO2, SiO2, ZnO, or metals like Ag, Al) that do not contain ionic impurities. This extraction of harmful materials while retaining the color filtering function through structural optics eliminates the source of display afterimages.
Solution Approach 2:
The patent employs composite material structures combining inorganic nanomaterials (metal oxides or metals) with transparent substrates. These composite structures achieve color filtering through optical interference and diffraction from the nanoscale geometry rather than through organic pigments, providing both high color gamut and elimination of ionic impurity-related afterimages.
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 effectively improves color gamut and reduces display afterimages by using nanostructures to filter light, maintaining high transmittance and eliminating ion-induced electric field issues.
Implementation Method 1
each non-periodic nanostructure is configured to enable coupling and interference of light incident thereon such that light exiting from the sub-pixel region in which the non-periodic nanostructure is located has a predetermined color
Implementation Method 2
each of the plurality of light guide sub-portions in a same pixel region is configured such that light incident respectively on the plurality of light guide sub-portions in the same pixel region exits at different angles and enters into the at least one non-periodic nanostructure
Data Source
AI summary
A color filter (CF) substrate includes a CF structure disposed on a base, and multiple pixel regions each including multiple sub-pixel regions. The CF structure includes a nanostructure layer including multiple nanostructures and a light guide structure layer including multiple light guide structures, sequentially provided on the base. Each light guide structure is in a corresponding pixel region, and includes multiple light guide sub-portions. Each light guide sub-portion is in a corresponding sub-pixel region. Each sub-pixel region corresponds to a nanostructure, and each nanostructure is in a corresponding sub-pixel region. Each of the light guide sub-portions in one pixel region is configured such that light incident on the light guide sub-portions exits at different angles and enters into the nanostructure in the sub-pixel region corresponding thereto. Each nanostructure is configured such that light exiting from the sub-pixel region corresponding thereto has a predetermined color.