The default number of bumps is 100 (10 X 10). You need to change these .RpJZ[E
parameters to match your design. Note that LightTools allows many other xJ3C^b%H
placement options, but you will use the Bezier placement option for this jC&fnt,O
example. lg ews"
5.On both the X Placement tab and Y Placement tab, change the Number of yv-R<c!'
Bumps parameter to 300, as shown in the following figure. Click Apply after uq3pk3
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each change. k>ErD v8
6.Click OK to close the dialog box. O1v)*&NAI
Note that the number of bumps is 300 X 300, which results in about 90,000 .,u>WIUxj
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a 3l =q@72
manner defined by the Bezier parameterization option. Please see Chapter 5 of cb_C2+%8NA
the LightTools Core Module User’s Guide for more information. With the QVjHGY*R
current parameter values, the Bezier option varies the bump spacing along the O=A R`r# u
length of the light guide. The spacing in the orthogonal direction is constant. <%^ /uS
The X and Y refer to the local coordinate system of the surface. U =J5lo
LightTools Introductory Tutorial * 91 Mqr]e#"o
qy|bOl
HAPTER 5 Introduction to Backlight Design F>\,`wP
C CmB_g ?K
Examining Surface Properties Q# hRnM
Using the methods described in previous chapters, you may want to check your _&l 8^MD
model before you run a simulation. 0~U 0s3
Click on various parts of the model in the 3D Design View. Or use the System d >f;N+O%
Navigator to select different surfaces and view their Properties. oB 1Qw'J
w
1.In the System Navigator, click to open BottomSurface of the LightGuide, then O: :FB.k
click Zones, and then click Texture. LtB5;ByeQ0
2.Select SphericalElement, and then right-click and select Properties from the ZFLmD|q#{
shortcut menu. The Shape tab shows you a graphical representation of the p8,=K<
spherical bump shape that is the bottom of the light guide. nWsRa uY
You might be curious as to why you cannot see the 3D texture property zones you <PSz`)SN
defined. They are invisible by default, because drawing thousands of texture Owf!dMA;nF
elements can make displaying and exploring the model somewhat slow. If you THwM ',6
choose to make them visible, 3D textures are displayed in wireframe, even if the TFkG"e v
display mode is set to translucent. Wireframe rendering displays a bit faster and JA4 Zg*7I
shows more of the technical details. p&Qb&nWk<
92 * LightTools Introductory Tutorial Tu(:?
k5< n:dS
HAPTER 5 Introduction to Backlight Design +c _AAMe
C o'lG9ePM|
1.Rotate and zoom the model to that you can see something like the illustration Z0&^(Fb
below: ()6% 1zCO
. <lB2Nv -,
2.To reveal the Property Zones: "\*)KH` C
a.Right-click in the Design View and select View Preferences to display this IX+Jf? &^
dialog box. D#<y
pJR
b.On the Visibility tab, click the Property Zone check box to turn it on. -`4]u!A
c.Click OK. {APfSD_4
You will see the wire frame rendering of the spherical bumps on the St?mq* ,
bottom surface, and a solid color above it. The solid color is the 3D texture '5aA+XP|
of the BEFs (brightness-enhancing films) built automatically by the utility.
