Passive Signage Illumination via Turning Film and Diffuser

Solution Overview

Problem

Existing static graphic signage struggles to attract attention in crowded environments without the energy and heat costs associated with active backlighting.

Innovation Solution

The use of a turning film with a structured surface and a diffuser for controlled light redirection, combined with a reflector and graphic on a diffuser, to passively illuminate the signage using ambient or remotely located lighting.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If active backlighting is used to illuminate static graphic signage, then visibility and attention-grabbing capability are improved, but energy consumption and heat generation increase

Engineering Contradiction:

Improvesignage visibilityVSAvoidenergy consumption

Core Design Contradiction:

Illumination intensityVSUse of energy by moving object

Solution Approach 1:

The signage system uses ambient light from the environment to illuminate the graphic through passive optical elements (turning film and diffuser), eliminating the need for active light sources. The system serves itself by harvesting available environmental light and redirecting it toward viewers, thereby achieving illumination without external energy input.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent replaces the mechanical/electrical active backlighting system with a passive optical system consisting of turning film and diffuser layers. This substitution eliminates moving parts and electrical components, using instead optical redirection and diffusion to achieve the same illumination effect without energy consumption.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Illumination intensity

If active backlighting is used to illuminate static graphic signage, then visibility and attention-grabbing capability are improved, but heat generation increases

Engineering Contradiction:

Improvesignage visibilityVSAvoidheat generation

Core Design Contradiction:

Illumination intensityVSTemperature

Solution Approach 1:

The signage system uses ambient light from the environment to illuminate the graphic through passive optical elements (turning film and diffuser), eliminating the need for active light sources. The system serves itself by harvesting available environmental light and redirecting it toward viewers, thereby achieving illumination without external energy input.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent replaces the mechanical/electrical active backlighting system with a passive optical system consisting of turning film and diffuser layers. This substitution eliminates moving parts and electrical components, using instead optical redirection and diffusion to achieve the same illumination effect without energy consumption.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Use of energy by moving object

If passive illumination using turning film and diffuser is used, then energy consumption is reduced, but illumination intensity and viewer attention may be compromised

Engineering Contradiction:

Improveenergy consumptionVSAvoidsignage visibility

Core Design Contradiction:

Use of energy by moving objectVSIllumination intensity

Solution Approach 1:

The turning film is designed with specific localized optical properties to redirect light precisely toward viewer positions, while the diffuser provides controlled scattering. This local optimization of optical characteristics ensures that ambient light is efficiently directed where needed (toward viewers) rather than uniformly distributed, maximizing visibility from the passive system.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The signage assembly combines multiple optical layers (turning film with structured surface, diffuser material, and graphic layer) into a composite structure. Each layer contributes specific optical functions—redirection, diffusion, and visualization—together creating a synergistic effect that enhances overall illumination intensity from passive ambient light.

Inventive Principle:

Principle #40Composite materials

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

This solution effectively draws attention to the signage without the need for active backlighting, utilizing ambient light to create the perception of a powered backlight, reducing energy consumption and heat generation while maintaining visibility.

Implementation Method 1

a turning film having a structured surface for redirecting light

Methodology Applied

Scientific EffectLight redirection: Reflection

Implementation Method 2

a turning film having a structured surface for redirecting light

Methodology Applied

Scientific EffectRefraction: Refraction

Implementation Method 3

a diffuser providing for diffusion in at least one direction

Methodology Applied

Scientific EffectLight diffusion: Diffusion

Data Source

PatentUS9171489B2Self illuminated signage for printed graphics

Publication Date: 2015.10.27 3M INNOVATIVE PROPERTIES CO

AI summary

Self illuminated back and front lit signage for a printed graphic. The signage includes a turning film having a structured surface for redirecting light, a diffuser providing for diffusion, and a printed graphic. The turning film receives light from an ambient light source and directs the light via the structured surface toward a viewer of the graphic in order to passively illuminate the signage.