Aspheric Lens Display Filter for Bright Room Contrast
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Plasma display panels (PDPs) face issues with reduced contrast ratio and brightness in bright rooms due to external light interference, which also affects the viewing angle and can emit harmful electromagnetic and near-infrared radiation.
Innovation Solution
An external light shielding film with a lens pattern of aspheric lenses and an external light shielding pattern on a base substrate is integrated into a display filter, designed to selectively absorb external light and improve the viewing angle while shielding electromagnetic and near-infrared radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a separate light absorption pattern is used to absorb external light and increase contrast ratio, then the contrast ratio is improved, but the brightness is deteriorated and the viewing angle is reduced
Solution Approach 1:
The patent employs aspheric lenses with curved surfaces to refract and redirect external light away from the display panel. The spherical curvature enables the lenses to focus and redirect light rays effectively, achieving high contrast ratio without the need for light-absorbing patterns that would reduce brightness and viewing angle.
2Measurement precision
If a separate light absorption pattern is used to absorb external light and increase contrast ratio, then the contrast ratio is improved, but the viewing angle is reduced
Solution Approach 1:
The aspheric lenses utilize their curved geometry to redirect external light in a manner that preserves wide viewing angles. The spherical shape allows light to be refracted uniformly across different viewing directions, maintaining both high contrast ratio and broad viewing angle simultaneously.
3Object-affected harmful factors
If the PDP filter is equipped in a front unit to perform EM radiation-shielding and NI radiation-shielding functions, then the shielding function is improved, but the transparency is reduced
Solution Approach 1:
The patent utilizes a microporous film structure that allows electromagnetic and near-infrared radiation to pass through while maintaining visible light transparency. The porous structure provides pathways for harmful radiation to be blocked or absorbed while permitting visible light to transmit, thereby achieving both shielding and transparency requirements.
Solution Approach 2:
The PDP filter employs composite material construction combining multiple layers with different optical and shielding properties. This composite structure enables simultaneous achievement of EM radiation shielding, NI radiation shielding, and high transparency by leveraging the complementary characteristics of each material layer.
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 increases the contrast ratio and brightness of PDPs in bright environments, enhances the viewing angle, and reduces the emission of harmful radiation.
Implementation Method 1
a lens pattern formed on a surface of a base substrate and including a plurality of aspheric lenses
Implementation Method 2
an external light shielding pattern formed on another surface of the base substrate
Data Source
AI summary
An external light shielding film including a lens pattern formed on a surface of a base substrate and including a plurality of aspheric lenses, and an external light shielding pattern formed on another surface of the base substrate, and a display filter having the same, are provided. The external light shielding film and the display filter having the same may increase a contrast ratio in a bright room, enhance brightness, and increase a viewing angle.