The default number of bumps is 100 (10 X 10). You need to change these z`,dEGfh^
parameters to match your design. Note that LightTools allows many other ^-F#"i|Cn
placement options, but you will use the Bezier placement option for this 55=YM'5]
example. QQD7NN>
5.On both the X Placement tab and Y Placement tab, change the Number of 9<o*aFgCa
Bumps parameter to 300, as shown in the following figure. Click Apply after -?-yeJP2
each change. iu2O/l# r
6.Click OK to close the dialog box. .vd*~U"
Note that the number of bumps is 300 X 300, which results in about 90,000 ]l`V#Rd
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a +^%)QH>9
manner defined by the Bezier parameterization option. Please see Chapter 5 of )|W6Z
the LightTools Core Module User’s Guide for more information. With the U|aEyMU
current parameter values, the Bezier option varies the bump spacing along the 'Z)#Sz Y
length of the light guide. The spacing in the orthogonal direction is constant. H|/"'t
OZ
The X and Y refer to the local coordinate system of the surface. /v.<h*hxWy
LightTools Introductory Tutorial * 91 V6B[eV$D
n*caP9B
HAPTER 5 Introduction to Backlight Design WkV0,_(P
C P G
zwS
Examining Surface Properties EAE#AB-A
Using the methods described in previous chapters, you may want to check your ;@O8y\@
model before you run a simulation.
[WXcp1p
Click on various parts of the model in the 3D Design View. Or use the System I1JL`\;4
Navigator to select different surfaces and view their Properties. k#Qjm 9V
1.In the System Navigator, click to open BottomSurface of the LightGuide, then U&SSc@of
click Zones, and then click Texture. %v UUx +
2.Select SphericalElement, and then right-click and select Properties from the tg<bVA)E'J
shortcut menu. The Shape tab shows you a graphical representation of the ~*`wRiUhis
spherical bump shape that is the bottom of the light guide. #TcX5
You might be curious as to why you cannot see the 3D texture property zones you Ad bTI#eY
defined. They are invisible by default, because drawing thousands of texture 3ouo4tf$H.
elements can make displaying and exploring the model somewhat slow. If you Swgvj(y;!A
choose to make them visible, 3D textures are displayed in wireframe, even if the @c}Gw;e
display mode is set to translucent. Wireframe rendering displays a bit faster and 'a$/ !~X
shows more of the technical details.
ONUa7
92 * LightTools Introductory Tutorial ,^jQBD4={
#%{
HAPTER 5 Introduction to Backlight Design NOf{Xx<#k
C %VE FruM
1.Rotate and zoom the model to that you can see something like the illustration lB7/oa1]>
below: 3@* ~>H
. b,47
EJ}
2.To reveal the Property Zones: Sg13Dp @x
a.Right-click in the Design View and select View Preferences to display this
&a6-+r
dialog box. s !I I}'Je
b.On the Visibility tab, click the Property Zone check box to turn it on. M&e=LV
c.Click OK. SQN{/")T
You will see the wire frame rendering of the spherical bumps on the C;ME" 4,(
bottom surface, and a solid color above it. The solid color is the 3D texture ?P}) Qa
of the BEFs (brightness-enhancing films) built automatically by the utility.
