Textured Glass Substrate for Display Light Scattering
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Solution Overview
Problem
Conventional transparent display systems suffer from low light transmission, leading to non-uniform image quality, color issues, and the need for high ambient light, which is not always feasible or desirable, due to their limited contrast ratio and reliance on reflective media.
Innovation Solution
A light emitter with a textured substrate that scatters light to enhance transparency and brightness, eliminating the need for complex scattering films and reflective media, while maintaining low haze and high transmittance, using a wet chemical etching process to create nanometer-sized features on glass substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional transparent display systems use reflective media and diffusive films to produce light, then light scattering is achieved, but light transmission is reduced and image quality becomes non-uniform
Solution Approach 1:
The patent removes diffusive films and reflective media from the display system, extracting the light scattering function into the glass substrate itself through chemically etched pyramidal structures. This eliminates the sources of non-uniformity while maintaining light scattering capability.
Solution Approach 2:
The patent merges the light scattering function with the glass substrate by etching pyramidal structures directly into it. This combines the substrate and scattering elements into a single integrated component, eliminating interfaces that cause non-uniformity and improving image quality.
2Illumination intensity
If conventional transparent displays use diffusive films for light scattering, then brightness is enhanced, but device complexity increases
Solution Approach 1:
The patent combines the glass substrate and light scattering elements into a single integrated component by etching pyramidal structures directly into the substrate. This eliminates separate diffusive films and reduces device complexity while maintaining brightness enhancement.
Solution Approach 2:
The glass substrate serves multiple functions simultaneously: it provides structural support, optical clarity, and light scattering through its etched pyramidal structures. This multi-functionality eliminates the need for separate diffusive films and reduces overall device complexity.
3Reliability
If conventional transparent displays rely on high ambient light for visibility, then contrast ratio is improved, but adaptability to different environments is reduced
Solution Approach 1:
The patent changes the optical parameters of the glass substrate by etching pyramidal structures with specific geometric characteristics (side lengths of 5-20 micrometers). This modifies light scattering behavior to improve contrast ratio while maintaining adaptability across different ambient light conditions.
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 provides improved light output, uniform illumination, and enhanced image rendering quality by increasing brightness and viewing angle, while reducing the need for ambient light and eliminating image distortion from glare and reflection.
Implementation Method 1
at least one of the opposing major surfaces includes a surface texture configured to scatter at least a portion of the light propagating within the light guide
Implementation Method 2
using a wet chemical etching process to create nanometer-sized features on glass substrates
Data Source
AI summary
A substrate with a textured surface is disclosed. The substrate may be, for example, a light emitter comprising a light guide, for example a backlight element for use in a display device, wherein a surface of the light guide, for example a glass substrate, is configured to have a textured surface with a predetermined RMS roughness and a predetermined correlation length of the texture. A plurality of light scatter suppressing features can be provided on the textured surface. Textured surfaces disclosed herein may be effective to reduce electrostatic charging of the substrate surface. Methods of producing the textured surface are also disclosed.