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lighttools背光板教程

光学设计

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介绍了lighttools背光板设计的理论基础，并结合软件的一个实例引导你进行了一次均匀的背光板设计流程

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Backlight Design and Analysis Using LightTools, Page 1

3280 East Foothill Boulevard

Pasadena, California 91107 USA

(626) 795-9101 Fax (626) 795-0184

e-mail: service@opticalres.com

World Wide Web: http://www.opticalres.com

Backlight Design and

Analysis Using LightTools

kli

Overview

• Backlights and their applications (a brief

introduction)

• Bump patterns for the light guides using 3D

Texture

• Surface properties and materials for backlight

components

• Secondary components in backlights

–BEFs

–Diffusers

–Polarizers

• Using the graphical output in LightTools

•Workshops

Backlight Design and Analysis Using LightTools, Page 2

kli

Introduction to Backlights

• Applications of backlights include devices from

PDAs, cellular phones, laptop computers to

large-screen TVs

• Liquid crystal displays (LCDs) are the common

choice for displaying images/text

• Liquid crystals are not light-emitting materials

– Light sources must be added

• Backlights are used for flat panel LCDs that

require illumination from behind

• Goals for Backlight design

– Uniform luminance, high contrast, small

thickness, controlled viewing angle, low

power consumption, etc.

kli

A Typical Backlight System

BEFs

Lamp and

reflector

Reflective

layer

Texture

Diffuser

Light

guide

Backlight Design and Analysis Using LightTools, Page 3

kli

Common Sources for Backlights

• CCFLs (Cold Cathode Fluorescent Lamp) and hi flux LEDs

for large screen displays

• LEDs for small screen displays (such as cellular phones)

kli

Light Extraction

• Edge-lit

– Light is injected into the light guide, and

extracted in a perpendicular direction

– Printed (paint dots) or molded (3D bumps)

scattering medium is built into the light guide

www.3m.com

Backlight Design and Analysis Using LightTools, Page 4

kli

Light Extraction

• Direct-lit

– Sources are placed directly underneath the

display

LED-based LCD

TV by

LumiLEDS

37” FL-based

LCD TV by

Sharp

kli

3D Texture

• Paint dot patterns or bump patterns are used as the light

scattering medium on the light guide

• Backlight systems with 3D Bumps are more popular

– Can be molded with the light guide

– Reduced production cost

• This presentation will concentrate on backlight design using

the 3D Texture (also known as molded light extraction)

A light

guide with

spherical

bumps

Backlight Design and Analysis Using LightTools, Page 5

kli

Current Texture Shapes in LightTools

• Sphere

•Prism

•Pyramid

• Cone/Cylinder

• Horizontal

Cylinder

kli

Texture Placement Options

• Eight options for

element placement

– Rectangular

– Shifted Rectangular

– Hexagonal

–Bezier

– Polynomial

–Radial

– Radial polynomial

– List (elements are

placed using user

defined coordinates

on the zone)

Bezier

Polynomial

Radial

Polynomial

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