Optical Path Control Member with Scattering and Absorbing Particles
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Solution Overview
Problem
Existing light-shielding films experience reduced front luminance due to aggregated particles acting as light blockers, and increasing backlight module light can lead to heat issues.
Innovation Solution
A light route control member incorporating metal oxide particles for light scattering and light absorbing particles with controlled specific gravity and polarity to enhance light transmittance and dispersion stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If light absorbing particles are aggregated in one region to control viewing angle, then viewing angle control is achieved, but front luminance is lowered
Solution Approach 1:
The patent combines light absorbing particles and light scattering particles into a single composite particle structure. The light absorbing particle core provides viewing angle control by absorbing light in specific directions, while the light scattering particle shell maintains front luminance by scattering light toward the viewer. This merging of two different particle types into one composite structure resolves the contradiction between viewing angle control and front luminance maintenance.
Solution Approach 2:
The patent uses composite material structure where a light absorbing particle is coated with a light scattering particle shell. This composite particle structure allows simultaneous achievement of light absorption for viewing angle control and light scattering for maintaining front luminance, directly resolving the technical contradiction between these two functions.
2Illumination intensity
If backlight module light is increased to improve front luminance, then front luminance is improved, but heat is increased
Solution Approach 1:
The patent replaces the mechanical approach of increasing backlight light output with an optical approach using light scattering particles. Instead of increasing the backlight module's light emission (which generates heat), the patent uses light scattering particles to redirect existing light toward the viewer, improving front luminance without additional heat generation.
Solution Approach 2:
The light scattering particles act as an intermediary between the backlight module and the viewer. They scatter light from the backlight toward the viewer, improving perceived front luminance without requiring the backlight to emit more light, thus avoiding additional heat generation from the backlight module.
3Illumination intensity
If metal oxide particles are added for light scattering, then front transmittance is improved, but particle dispersion stability may be affected
Solution Approach 1:
The patent changes the surface properties of metal oxide particles by coating them with a resin layer or applying surface treatment. This parameter change in surface chemistry improves dispersion stability by reducing particle aggregation, while maintaining the light scattering properties needed for front transmittance improvement.
Solution Approach 2:
The patent applies a thin resin coating layer on metal oxide particles. This flexible shell provides steric stabilization that prevents particle aggregation and maintains dispersion stability, while being thin enough to allow light scattering functionality to remain effective for improving front transmittance.
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
Improves front transmittance and luminance uniformity by scattering light through metal oxide particles, maintaining consistent visibility and preventing particle settling.
Implementation Method 1
adding metal oxide particles for inducing light scattering together with light absorbing particles to a light conversion unit
Implementation Method 2
light absorbing particles with controlled specific gravity and polarity
Implementation Method 3
the surface of the first particle and the surface of the second particle are charged with the same polarity
Data Source
AI summary
An optical path control member, according to an embodiment, comprises: a first substrate; a first electrode disposed on an upper surface of the first substrate; a second substrate disposed on the first substrate; a second electrode disposed on a lower surface of the second substrate; and an optical conversion unit disposed between the first electrode and the second electrode, wherein the optical conversion unit includes partition wall parts and accommodation parts which are alternately disposed, the accommodation parts have a light transmission rate that varies according to the application of voltage, and comprise dispersion liquids and optical conversion particles dispersed in the dispersion liquids, the optical conversion particles include first particles and second particles, each of the second particles has a hollow formed therein, and each surface of the first particles and each surface of the second particles are charged with the same polarity.