Diffusing Lens Engaging Portion for Reflecting Sheet Stability

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Solution Overview

Problem

Existing illumination devices with reflecting sheets in liquid crystal display devices suffer from brightness unevenness and light loss due to the rising of the reflecting sheet, and the fixing of diffusing lenses is unstable, making the production process cumbersome and difficult to repair.

Innovation Solution

An illumination device with a diffusing lens that includes a lens portion and a fixing portion with an engaging portion to sandwich the reflecting sheet, reducing the gap between the sheet and the lens, stabilizing the lens fixation, and allowing for easy assembly and disassembly without adhesive layers.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If the reflecting sheet is fixed to the mounting board using a rivet far from the LED, then the LED illumination is not blocked, but the reflecting sheet rises around the mounting board causing light loss and brightness unevenness

Engineering Contradiction:

Improvebrightness uniformityVSAvoidlight loss

Core Design Contradiction:

Illumination intensityVSLoss of energy

Solution Approach 1:

The reflecting sheet is divided into multiple regions with different fixing strategies: a first fixing region with through-holes for rivets far from the LED, and a second fixing region with engagement protrusions near the LED to prevent rising. This segmentation allows different parts of the reflecting sheet to be fixed differently, preventing light loss near the LED while maintaining unblocked illumination path.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Engagement protrusions are introduced as intermediary structures between the reflecting sheet and the mounting board. These protrusions engage with corresponding engagement grooves in the diffusing lens to prevent the reflecting sheet from rising around the LED, thereby eliminating light loss and brightness unevenness without blocking the illumination path.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If the diffusing lens is fixed using adhesive layers, then the lens is securely attached, but the production process becomes cumbersome and repair becomes difficult

Engineering Contradiction:

Improvelens fixation stabilityVSAvoidproduction process complexity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The diffusing lens is segmented with multiple types of fixing structures: engagement protrusions for securing the reflecting sheet, through-holes for rivet fixation, and engagement grooves for interfacing with the reflecting sheet. This segmentation enables mechanical fixation without adhesive layers, simplifying production and repair processes while maintaining reliable lens attachment.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Adhesive bonding is replaced with mechanical engagement structures including engagement protrusions, engagement grooves, and rivet fixation. This mechanical substitution eliminates the need for adhesive layers, making the production process simpler and repairs easier while maintaining secure lens fixation.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Ease of operation

If the reflecting sheet is raised around the mounting board, then the LED illumination path is clear, but light emitted from the LED goes under the reflecting sheet causing brightness unevenness

Engineering Contradiction:

Improveillumination path clearanceVSAvoidbrightness uniformity

Core Design Contradiction:

Ease of operationVSIllumination intensity

Solution Approach 1:

Engagement protrusions and engagement grooves are introduced as intermediary mechanical interfaces between the reflecting sheet and the diffusing lens. These structures prevent the reflecting sheet from rising around the LED while maintaining clear illumination path, thereby eliminating brightness unevenness caused by light leakage underneath the reflecting sheet.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 effectively alleviates the rising of the reflecting sheet, reduces light loss, stabilizes the lens fixation, and simplifies the production and repair processes by shortening the distance between the lens and the sheet, thus improving brightness uniformity and operational efficiency.

Implementation Method 1

a diffusing lens that is disposed to cover a light emitting side of the light emitting element and diffuse light emitted from the light emitting element

Methodology Applied

Scientific EffectLight diffusion: Scattering

Implementation Method 2

a reflecting sheet that reflects light emitted from the LEDs to the liquid crystal display panel side

Methodology Applied

Scientific EffectLight reflection: Reflection

Data Source

PatentUS9388964B2Illumination device and display device equipped with same

Publication Date: 2016.07.12 ENPLAS CORP

AI summary

Provided is an illumination device capable of preventing a reflection sheet in the periphery of a light-emitting element from being raised while minimizing the instability in the fixture of a diffusion lens. The illumination device comprises a light-emitting element, a mounting substrate, a diffusion lens, and a reflection sheet having a through-hole. The diffusing lens includes a lens portion for diffusing light, and a fixed portion to be fixed to the mounting substrate. An engaging portion that sandwiches the reflection sheet between the engaging portion and the mounting substrate is formed in the fixed portion.