The default number of bumps is 100 (10 X 10). You need to change these Iz8 ^? >X
parameters to match your design. Note that LightTools allows many other 7EO &:b ]
placement options, but you will use the Bezier placement option for this C r%r<*s
example. U:|v(U $"?
5.On both the X Placement tab and Y Placement tab, change the Number of bLzuaNa'
Bumps parameter to 300, as shown in the following figure. Click Apply after #G=QL(f>/
each change. 6V?RES;X
6.Click OK to close the dialog box. 7jbm w<d)9
Note that the number of bumps is 300 X 300, which results in about 90,000 1c"m$)a4
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a h3IkOh4|h
manner defined by the Bezier parameterization option. Please see Chapter 5 of eM"mP&TTL
the LightTools Core Module User’s Guide for more information. With the pi}H.iF
current parameter values, the Bezier option varies the bump spacing along the 1Qu,]i`
length of the light guide. The spacing in the orthogonal direction is constant. Uh Tr<(@
The X and Y refer to the local coordinate system of the surface. `6$b1qv,
LightTools Introductory Tutorial * 91 7qz-RF#s8
P0(~~z&%[
HAPTER 5 Introduction to Backlight Design xi\RUAW
C }gi' %e
Examining Surface Properties hNo>)$v!s
Using the methods described in previous chapters, you may want to check your EI.Pk>ZIm
model before you run a simulation. ^ks^9*'|j
Click on various parts of the model in the 3D Design View. Or use the System an`(?6d
Navigator to select different surfaces and view their Properties. 1n( }Q1fa
1.In the System Navigator, click to open BottomSurface of the LightGuide, then #jx?uS
click Zones, and then click Texture. DOIWhd5:
2.Select SphericalElement, and then right-click and select Properties from the Lp)8SmN
shortcut menu. The Shape tab shows you a graphical representation of the y;Ln ao7i
spherical bump shape that is the bottom of the light guide. XL=R]IC<.
You might be curious as to why you cannot see the 3D texture property zones you
cgeS)C7
defined. They are invisible by default, because drawing thousands of texture walRqlo@
elements can make displaying and exploring the model somewhat slow. If you R<- C>D
choose to make them visible, 3D textures are displayed in wireframe, even if the :+Ax3
display mode is set to translucent. Wireframe rendering displays a bit faster and _ 5w?v~6 5
shows more of the technical details. `>EvT7u
92 * LightTools Introductory Tutorial *9ub.:EUwV
7B!Qq/E?g
HAPTER 5 Introduction to Backlight Design c\{}FGC
C ydqmuZ%2h#
1.Rotate and zoom the model to that you can see something like the illustration y]_8.
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below: MxEAs}MDv
. >m1 V9 A
2.To reveal the Property Zones: s7i.p]
a.Right-click in the Design View and select View Preferences to display this aZ>\*1
dialog box. dd7nO
:]
b.On the Visibility tab, click the Property Zone check box to turn it on. dG?a"/ MA
c.Click OK. u=}bq{
You will see the wire frame rendering of the spherical bumps on the &E
riskI
bottom surface, and a solid color above it. The solid color is the 3D texture %O=V4%"m\
of the BEFs (brightness-enhancing films) built automatically by the utility.
