Identical Selective-Wavelength-Reflection Layers for Display Devices
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Solution Overview
Problem
Existing display devices require complex configurations with multiple selective-wavelength-reflection layers of different compositions, leading to light scatter and contrast degradation.
Innovation Solution
A display device with a simpler configuration using identical, polarization-independent selective-wavelength-reflection layers adjacent to the optical-input surfaces of transmissive filters, which reflect light of specific wavelength bands, allowing for effective light utilization without the need for multiple distinct layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If different types of selective-wavelength-reflection layers are used for different transmissive filters, then light usage efficiency is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by using the same selective-wavelength-reflection layer structure (first and second reflective layers with specific refractive indices and thicknesses) for all transmissive filters (red, green, and blue). This single universal structure replaces what would traditionally require multiple different selective-wavelength-reflection layers, thereby improving light usage efficiency while reducing device complexity and manufacturing steps
Solution Approach 2:
The patent changes the optical parameters (refractive indices and thicknesses) of the reflective layers to create a universal selective-wavelength-reflection structure that can effectively reflect unwanted wavelengths across all color channels. By optimizing these parameters, the same layer structure achieves wavelength selectivity for multiple transmissive filters simultaneously, resolving the contradiction between efficiency and complexity
2Manufacturing precision
If multiple different selective-wavelength-reflection layers are used, then wavelength selectivity is improved, but manufacturing process complexity increases
Solution Approach 1:
The patent merges the functions of multiple different selective-wavelength-reflection layers into a single unified structure consisting of first and second reflective layers. This combined structure provides the necessary wavelength selectivity for all transmissive filters while simplifying the manufacturing process by reducing the number of distinct layers that need to be fabricated and assembled
Solution Approach 2:
The universal reflective layer structure serves multiple functions simultaneously: it provides wavelength selectivity for red, green, and blue transmissive filters, maintains manufacturing simplicity, and achieves the desired optical performance without requiring multiple specialized layers
3Reliability
If traditional selective-wavelength-reflection layers are used, then contrast ratio is maintained, but light scatter occurs
Solution Approach 1:
The patent changes the optical parameters of the reflective layers, specifically setting the refractive index of the first reflective layer between 1.3-1.7 and the second reflective layer between 1.6-2.1, with optimized thickness ratios. These parameter changes reduce light scatter while maintaining the contrast ratio, as the specific refractive index combination minimizes unwanted reflections and improves optical clarity
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 enhances light usage efficiency, minimizes process steps, and avoids contrast degradation by eliminating light scatter, resulting in improved display performance.
Implementation Method 1
The first selective-wavelength-reflection layer reflects light of a wavelength band that passes through the blue transmissive filter. The second selective-wavelength-reflection layer reflects light of a wavelength band that passes through the blue transmissive filter.
Implementation Method 2
The first, second and third transmissive filters transmit respective light beams having peak wavelengths different from each other.
Data Source
AI summary
A display device includes: a color filter including a first transmissive filter, a second transmissive filter, and a third transmissive filter, the first, second and third transmissive filters being configured to transmit respective light beams having peak wavelengths different from each other; a first selective-wavelength-reflection layer adjacent to an optical-input surface of the first transmissive filter, the first selective-wavelength-reflection layer being configured to reflect light of a wavelength band that passes through the third transmissive filter; a second selective-wavelength-reflection layer adjacent to an optical-input surface of the second transmissive filter, the second selective-wavelength-reflection layer being configured to reflect light of a wavelength band that passes through the third transmissive filter, the second selective-wavelength-reflection layer being identical in composition to the first selective-wavelength-reflection layer; and a light emitter configured to emit light that travels toward the color filter.