Optical Film Micro-Hemisphere Diffusion Layer

Solution Overview

Problem

Conventional LCD backlight modules face issues with non-uniform light distribution and excessive heat generation due to increased lamp numbers, leading to reduced panel lifetime and high power consumption, which are not effectively addressed by existing optical films like Brightness Enhancement Films (BEFs) that require additional components and energy for improved brightness.

Innovation Solution

An optical film with a micro-hemisphere layer on the top surface and an unsmooth diffusion layer on the bottom surface, which uniformly diffuses and condenses light, providing both light diffusion and condensation capabilities without the need for additional components or increased energy consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If the number of lamps is increased to enhance LCD brightness, then the luminance is improved, but heat accumulation increases and power consumption rises

Engineering Contradiction:

ImprovebrightnessVSAvoidheat accumulation

Core Design Contradiction:

Illumination intensityVSTemperature

Solution Approach 1:

The patent combines both diffusion and condensation functions into a single optical film by integrating a diffusion layer and a micro-prism layer. This merging eliminates the need for separate diffusion films and lamp arrays, achieving brightness enhancement without proportional increases in heat generation and power consumption.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent employs micro-prism structures with specific curvature radii (R1 and R2) on the condensation layer to refract and focus light efficiently. The spherical/cylindrical geometry of these micro-prisms enables effective light condensation at reduced power consumption compared to increasing lamp quantity.

Inventive Principle:

Principle #14Spheroidality (Curvature)

2Illumination intensity

If the number of lamps is increased to enhance LCD brightness, then the luminance is improved, but power consumption increases

Engineering Contradiction:

ImprovebrightnessVSAvoidpower consumption

Core Design Contradiction:

Illumination intensityVSUse of energy by moving object

Solution Approach 1:

The patent combines both diffusion and condensation functions into a single optical film by integrating a diffusion layer and a micro-prism layer. This merging eliminates the need for separate diffusion films and lamp arrays, achieving brightness enhancement without proportional increases in heat generation and power consumption.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent replaces the mechanical approach of adding more light sources (lamps) with an optical structure-based solution (micro-prism lens array). This substitution achieves light concentration and brightness enhancement through optical geometry rather than increased energy input.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Stability of the object's composition

If a diffusion film is added under the brightness enhancement film to improve light uniformity, then the light distribution is improved, but the backlight module complexity and cost increase

Engineering Contradiction:

Improvelight uniformityVSAvoidbacklight module structure

Core Design Contradiction:

Stability of the object's compositionVSDevice complexity

Solution Approach 1:

The patent combines both diffusion and condensation functions into a single optical film by integrating a diffusion layer and a micro-prism layer. This merging eliminates the need for separate diffusion films and lamp arrays, achieving brightness enhancement without proportional increases in heat generation and power consumption.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The single optical film performs multiple functions: the diffusion layer provides light uniformity while the micro-prism layer provides light condensation and direction control. This multi-functional design replaces what would traditionally require separate components, simplifying the backlight module structure.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 optical film achieves better light uniformity and condensation, enhancing LCD brightness while being thin, lightweight, compact, and cost-effective, suitable for battery-powered portable applications.

Implementation Method 1

The light is diffused and uniformed by the unsmooth diffusion layer

Methodology Applied

Scientific EffectLight diffusion: Scattering

Implementation Method 2

The main function of BEF is to collect dispersive light emitted towards all directions from a light guide by refraction and total internal reflection

Methodology Applied

Scientific EffectRefraction: Refraction

Implementation Method 3

The main function of BEF is to collect dispersive light emitted towards all directions from a light guide by refraction and total internal reflection

Methodology Applied

Scientific EffectTotal internal reflection: Total Internal Reflection

Data Source

PatentUS7929211B2Optical film

Publication Date: 2011.04.19 ETERNAL MATERIALS CO LTD

AI summary

An optical film comprises a transparent substrate including a top surface and a bottom surface; a micro-hemisphere layer disposed on the top surface of the transparent substrate and having a plurality of hemispheric projections, and an unsmooth diffusion layer disposed on the bottom layer of the transparent substrate. The micro-hemisphere layer condenses a light. The unsmooth diffusion surface diffuses a light.