Filter Sheet with Wavelength-Selective Medium Films
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Solution Overview
Problem
Conventional color filter substrates in flat panel displays have low transmittance and high heat conversion due to absorbing-type mechanisms, limiting the availability and efficiency of incident light.
Innovation Solution
A filter sheet comprising three medium films with specific wavelength ranges, where portions are removed to reflect and transmit light accordingly, improving light reuse and reducing heat conversion, and can be integrated into a display device or manufactured using Bragg reflection and medium layers with varying thicknesses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If absorbing-type color filter mechanism is used, then color display function is achieved, but light transmittance is low and heat conversion is high
Solution Approach 1:
The patent inverts the conventional absorbing-type color filter mechanism by using a transmissive-type approach with medium films that selectively transmit specific wavelength ranges. Instead of absorbing unwanted wavelengths, the filter sheet allows desired wavelengths to pass through while reflecting others, thereby improving light transmittance and reducing heat conversion.
Solution Approach 2:
The patent changes the fundamental parameter of light interaction from absorption to transmission by introducing medium films with specific optical properties. Each medium film is designed to transmit light in a specific wavelength range, transforming the color filter mechanism from energy-absorbing to energy-transmitting, thus resolving the contradiction between light transmittance and heat conversion.
2Use of energy by moving object
If absorbing-type color filter is used, then color selection is achieved, but availability of incident light is reduced
Solution Approach 1:
The patent segments the visible light spectrum into different wavelength ranges and assigns specific medium films to transmit each range. By dividing the spectral transmission function into separate segments (red, green, blue wavelength ranges), the system maintains color display performance while improving overall light availability through selective transmission rather than absorption.
Solution Approach 2:
The patent introduces medium films as intermediary elements between the backlight and the display pixels. These medium films act as selective transmitters that allow specific wavelengths to pass through while blocking others, thereby improving light availability without compromising color display reliability.
3Productivity
If conventional color filter substrate is used, then manufacturing process is simple, but light efficiency is low
Solution Approach 1:
The patent employs composite material structures in the form of stacked medium films, each with specific optical properties. This composite approach enables selective wavelength transmission while maintaining manufacturing simplicity, as the medium films can be deposited using conventional semiconductor fabrication processes.
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
Enhances light availability and reduces heat conversion by reflecting non-essential wavelengths back into the system, improving the overall efficiency of light usage in display devices.
Implementation Method 1
the first medium film reflects light in a first wavelength range and transmits light outside the first wavelength range
Implementation Method 2
the first medium film reflects light in a first wavelength range and transmits light outside the first wavelength range
Implementation Method 3
the second medium film reflects light in a second wavelength range and transmits light outside the second wavelength range
Implementation Method 4
the second medium film reflects light in a second wavelength range and transmits light outside the second wavelength range
Implementation Method 5
the third medium film reflects light in a third wavelength range and transmits light outside the third wavelength range
Implementation Method 6
the third medium film reflects light in a third wavelength range and transmits light outside the third wavelength range
Data Source
AI summary
A filter sheet, a manufacturing method thereof and a display device are disclosed. The filter sheet includes: a first medium film, a second medium film and a third medium film attached to each other, wherein the filter sheet comprises a first pixel region, a second pixel region and a third pixel region; a portion of the first medium film in the first pixel region of the filter sheet is removed, a portion of the second medium film in the second pixel region of the filter sheet is removed, and a portion of the third medium film in the third pixel region of the filter sheet is removed; the first medium film reflects light in a first wavelength range and transmits light outside the first wavelength range; the second medium film reflects light in a second wavelength range and transmits light outside the second wavelength range; and the third medium film reflects light in a third wavelength range and transmits light outside the third wavelength range.