Display Filter With Recessed Dual-Refractive Parts for Ghost Reduction
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Solution Overview
Problem
Display filters struggle to effectively block electromagnetic waves and near-infrared rays while maintaining image quality, leading to issues like ghost effects and reduced luminance due to the limitations in refractive index differences and structural design.
Innovation Solution
A display filter with a base portion and two distinct parts within a recess, each having different refractive indices, is designed to absorb and reflect light efficiently, enhancing light shielding and reducing ghost effects by optimizing the refractive index differences and structural geometry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional display filter structure is used, then electromagnetic waves and near-infrared rays can be blocked, but ghost effects occur and image quality deteriorates due to insufficient refractive index differences
Solution Approach 1:
The patent applies local quality by creating a dark color portion with a specific refractive index (1.7-2.2) that is higher than the base portion (1.4-1.6), concentrating the light-blocking function in a localized region. This localized refractive index enhancement allows effective electromagnetic wave blocking while maintaining image quality in other regions, resolving the contradiction between blocking performance and image quality.
Solution Approach 2:
The patent uses composite materials by combining the base portion (first material) with the dark color portion (second material having different refractive index). This composite structure enables simultaneous achievement of electromagnetic wave blocking and high image quality, as the two materials work together with their complementary optical properties to prevent ghost effects while maintaining display clarity.
2Object-affected harmful factors
If the refractive index of the filter material is increased to block more light, then electromagnetic wave blocking improves, but luminance decreases and ghost effects increase
Solution Approach 1:
The patent applies local quality by creating a dark color portion with a specific refractive index (1.7-2.2) that is higher than the base portion (1.4-1.6), concentrating the light-blocking function in a localized region. This localized refractive index enhancement allows effective electromagnetic wave blocking while maintaining image quality in other regions, resolving the contradiction between blocking performance and image quality.
Solution Approach 2:
The patent uses color changes by introducing a dark color portion with different optical properties that selectively absorbs and reflects light. This dark coloration in the recess region enhances light shielding without uniformly reducing luminance across the entire filter, as the base portion maintains its original transparency. The color difference creates the refractive index contrast needed to prevent ghost effects while preserving overall brightness.
3Ease of manufacture
If a simple single-layer filter structure is used, then manufacturing is easier, but ghost effects occur due to insufficient light reflection and absorption
Solution Approach 1:
The patent applies segmentation by dividing the filter into two distinct portions: a base portion and a dark color portion formed in a recess. This segmentation creates the necessary refractive index difference to prevent ghost effects while maintaining manufacturing simplicity. The dark color portion is formed as a separate layer in the recess region, allowing independent optimization of its refractive index and thickness to eliminate ghost effects without complicating the overall manufacturing process.
4Reliability
If the filter structure is modified to reduce ghost effects, then image quality improves, but aperture ratio decreases and luminance is reduced
Solution Approach 1:
The patent applies local quality by creating a dark color portion with a specific refractive index (1.7-2.2) that is higher than the base portion (1.4-1.6), concentrating the light-blocking function in a localized region. This localized refractive index enhancement allows effective electromagnetic wave blocking while maintaining image quality in other regions, resolving the contradiction between blocking performance and image quality.
Solution Approach 2:
The patent uses partial action by applying the dark color portion only in the recess region rather than across the entire filter surface. This partial application is sufficient to prevent ghost effects and improve image quality without excessively reducing the aperture ratio. The dark color portion's refractive index difference creates the necessary light reflection and absorption to eliminate ghosts, while the limited spatial extent preserves overall luminance and aperture ratio.
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 blocks external light and discharges internal light, improving image contrast and aperture ratio, while preventing ghost effects and ensuring high luminance and manufacturing yield.
Implementation Method 1
a first part disposed in the recess and having a first refractive index different from a refractive index of the base portion, and a second part disposed in the recess and having a second refractive index different from at least one of the first refractive index of the first part and the refractive index of the base portion
Data Source
AI summary
A display filter including a base portion having a recess, a first part disposed in the recess and having a first refractive index different from a refractive index of the base portion, and a second part disposed in the recess and having a second refractive index different from at least one of the first refractive index of the first part and the refractive index of the base portion.