Backlight Lens With Reflective Surface for Thin Modules

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional lenses in backlight modules do not control light distribution, leading to increased thickness of the module to average light, which is inefficient.

Innovation Solution

A lens design with a reflective surface opposite to a reflective board, allowing light to be reflected and directed onto the board, and then onto a display panel, while maintaining the distance between adjacent lenses without increasing module thickness.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If conventional lenses are used in backlight modules, then light can be transmitted through the lens, but the light distribution is not controlled and the module thickness must be increased to average the light

Engineering Contradiction:

Improvelight distributionVSAvoidmodule thickness

Core Design Contradiction:

Illumination intensityVSLength of stationary object

Solution Approach 1:

Instead of using a conventional lens that transmits light horizontally, this patent inverts the approach by using a reflective surface that redirects light vertically onto the reflective board. The lens structure is inverted to have the reflective surface at the bottom rather than the top, fundamentally changing how light is directed through the lens assembly.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The reflective board acts as an intermediary element that receives light from the lens and redirects it onto the display panel. This intermediary mechanism allows for controlled light distribution without requiring increased module thickness, as the reflective board manages the light path efficiency.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Illumination intensity

If conventional lenses are used, then light transmission occurs, but adjacent lenses require increased distance separation

Engineering Contradiction:

Improvelight transmissionVSAvoidlens separation distance

Core Design Contradiction:

Illumination intensityVSArea of stationary object

Solution Approach 1:

The lens structure is inverted to position the reflective surface at the bottom, which changes the light transmission pattern. This inversion allows adjacent lenses to be positioned closer together while maintaining effective light transmission, as the vertical reflection pattern reduces the need for horizontal separation.

Inventive Principle:

Principle #13The other way round (Inversion)

3Illumination intensity

If the module thickness is increased to average light, then light distribution improves, but the device becomes more complex and larger

Engineering Contradiction:

Improvelight averagingVSAvoidmodule structure

Core Design Contradiction:

Illumination intensityVSDevice complexity

Solution Approach 1:

By inverting the lens structure to have the reflective surface at the bottom, the patent achieves light averaging without increasing module thickness. This inversion creates a more compact design that maintains light distribution effectiveness while reducing overall device complexity.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The reflective board serves as an intermediary that enables light averaging through its reflective properties, eliminating the need to increase module thickness. This intermediary approach achieves the desired light distribution with a simpler, more compact module structure.

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

The lens design effectively directs light to the panel, maintaining lens separation distance without thickening the backlight module, thus optimizing light distribution and module thickness.

Implementation Method 1

The extending portion comprises a reflective surface. The reflective surface is located opposite to the reflective board. The light strikes the reflective surface and is reflected onto the reflective board.

Methodology Applied

Scientific EffectReflection: Reflection

Implementation Method 2

The lens further comprises a refracting portion, wherein the light passes through the refracting portion to strike the reflective surface.

Methodology Applied

Scientific EffectRefraction: Refraction

Data Source

PatentUS8042965B2Lens and backlight module of display utilizing the same

Publication Date: 2011.10.25 AU OPTRONICS CORP

AI summary

A display includes a panel and a backlight module. The backlight module includes a reflective board, a shell, at least two lenses and a light source. The lenses are installed on the reflective board. The reflective board is installed on the shell. The light source is installed in the shell and the light from the light source passes through the lenses. Each lens includes a bottom portion on the reflective board and an extending portion protruding slantwise from the bottom portion. The extending portion includes a reflective surface opposite to the reflective board approximately. A light from the light source is reflected onto the reflective board via the reflective surface, and then reflected onto the panel via the reflective board.