Optical Sheet Surface Geometry for Scintillation Suppression
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Solution Overview
Problem
Ultrahigh-definition display elements with a pixel density of 300 ppi or more experience scintillation issues due to surface unevenness, which existing techniques fail to adequately address, leading to degraded display quality.
Innovation Solution
An optical sheet with a specific uneven surface shape, characterized by certain ranges of inclination angle distribution parameters, including gap, inflection point, and kurtosis, is used to prevent scintillation by controlling the degree of surface unevenness and enhancing anti-glare properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If internal haze is increased to suppress scintillation, then scintillation prevention is improved, but resolution deteriorates
Solution Approach 1:
The invention changes the parameters of surface unevenness by controlling specific geometric characteristics (Rmax, Rmin, and their ratios) to achieve optimal light diffusion. By precisely controlling the magnitude and distribution of surface irregularities, the patent achieves scintillation suppression without excessive internal haze that would harm resolution
Solution Approach 2:
The invention combines surface unevenness structure with specific material properties (transmittance and haze values) to create a composite optical system. The optical sheet integrates both structural features (surface profile) and material characteristics to simultaneously achieve scintillation prevention and resolution maintenance
2Object-affected harmful factors
If surface unevenness is increased to improve anti-glare properties, then anti-glare performance is improved, but scintillation occurs
Solution Approach 1:
The invention optimizes the parameters of surface unevenness by controlling the maximum height (Rmax), minimum height (Rmin), and their ratio to achieve optimal light scattering. This precise parameter control allows the surface to diffuse external light effectively for anti-glare while maintaining uniformity to prevent scintillation effects
Solution Approach 2:
The invention applies different surface characteristics to different regions or aspects of the optical sheet. The surface unevenness is designed with specific local geometric properties (convex and concave portions with controlled dimensions) that provide anti-glare functionality while the overall distribution maintains uniformity to prevent scintillation
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 suppresses scintillation and maintains high anti-glare properties in ultrahigh-definition display elements, even in bright outdoor environments, while preventing a decrease in resolution and contrast.
Implementation Method 1
an optical sheet having an uneven shape on a surface... the uneven shape causes a phenomenon (scintillation) in which subtle luminance unevenness appears on image light
Data Source
AI summary
An optical sheet used as a component for a touch panel or a display element of a display device is capable of imparting a variety of characteristics such as anti-glare properties and preventing the scintillation of image light in ultrahigh-definition display elements having a pixel density of 300 ppi or more. The optical sheet has an uneven shape on a surface, and the uneven shape satisfies at least one of three disclosed conditions relating to the inclination angles of the uneven portions of the sheet and the distribution curves of the inclination angles.