Light Source Unit With Second Scattering Body For Thin Profile

Solution Overview

Problem

Existing light source units, such as LED backlights for display devices, face challenges in achieving even brightness while maintaining a thin profile, as the reflection patterns required for uniform light distribution increase the thickness of the unit.

Innovation Solution

Incorporating a second light scattering body between the micro light source and the first light scattering body, which scatters light to create a flatter intensity distribution, allowing for a thinner reflection pattern and maintaining even brightness.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If a reflection pattern is formed on the first surface of the base to achieve even brightness distribution, then brightness evenness is improved, but the thickness of the light source unit increases

Engineering Contradiction:

Improvebrightness evennessVSAvoidthickness of light source unit

Core Design Contradiction:

Illumination intensityVSLength of stationary object

Solution Approach 1:

The light scattering function is segmented into two separate bodies: the first light scattering body (base) and the second light scattering body. This division allows each component to have optimized thickness - the base can be thin while the second scattering body compensates for light distribution, resolving the contradiction between achieving even brightness and maintaining thin profile.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The second light scattering body acts as an intermediary element between the light source and the first light scattering body. It modifies the light intensity distribution before it reaches the base, enabling the system to achieve even brightness without requiring a thick reflection pattern on the base itself.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Illumination intensity

If the thickness of the reflection pattern is increased to achieve even brightness, then brightness evenness is improved, but the overall thickness of the light source unit increases

Engineering Contradiction:

Improvebrightness evennessVSAvoidthickness of reflection pattern

Core Design Contradiction:

Illumination intensityVSLength of stationary object

Solution Approach 1:

The light scattering function is segmented into two separate bodies: the first light scattering body (base) and the second light scattering body. This division allows each component to have optimized thickness - the base can be thin while the second scattering body compensates for light distribution, resolving the contradiction between achieving even brightness and maintaining thin profile.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention changes the optical parameters by introducing a second light scattering body with specific scattering properties. This allows the system to achieve the required light distribution effect with a thinner reflection pattern on the base, as the second scattering body contributes to the overall light diffusion and evenness.

Inventive Principle:

Principle #35Parameter changes

3Illumination intensity

If a thick reflection pattern is used to achieve even brightness distribution, then brightness evenness is improved, but manufacturing precision requirements increase

Engineering Contradiction:

Improvebrightness evennessVSAvoidmanufacturing robustness

Core Design Contradiction:

Illumination intensityVSManufacturing precision

Solution Approach 1:

The light scattering function is segmented into two separate bodies: the first light scattering body (base) and the second light scattering body. This division allows each component to have optimized thickness - the base can be thin while the second scattering body compensates for light distribution, resolving the contradiction between achieving even brightness and maintaining thin profile.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention changes the optical parameters by introducing a second light scattering body with specific scattering properties. This allows the system to achieve the required light distribution effect with a thinner reflection pattern on the base, as the second scattering body contributes to the overall light diffusion and evenness.

Inventive Principle:

Principle #35Parameter changes

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 configuration enables a thinner light source unit while ensuring even brightness on the emission surface, improving manufacturing robustness and reducing the thickness of the reflection pattern.

Implementation Method 1

a second light scattering body that is arranged between the first light scattering body and the at least one micro light source

Methodology Applied

Scientific EffectLight scattering: Scattering

Data Source

PatentUS11914245B2Light source unit, display device, and light source unit manufacturing apparatus

Publication Date: 2024.02.27 FUJIFILM CORP

AI summary

A light source unit and a display device that are further thinned while evenness in brightness on an emission surface is secured are provided.A light source unit and a display device of the present invention include a light source installation surface on which at least one micro light source is installed, a first light scattering body that includes a base which is arranged with the light source installation surface and has a light-transmitting property, and a reflection pattern which is formed on a first surface of the base positioned on a light source installation surface side based on light distribution characteristics of the at least one micro light source, and a second light scattering body that is arranged between the first light scattering body and the at least one micro light source.