The default number of bumps is 100 (10 X 10). You need to change these ">v76%>Z7
parameters to match your design. Note that LightTools allows many other |XtN\9V.
placement options, but you will use the Bezier placement option for this =n
cu# T]
example. HIk5Q'e k
5.On both the X Placement tab and Y Placement tab, change the Number of CDK0 $W n
Bumps parameter to 300, as shown in the following figure. Click Apply after d2Z5HFtY
each change. .Quu_S_ vH
6.Click OK to close the dialog box. ]- " )r
Note that the number of bumps is 300 X 300, which results in about 90,000 )c^Rc9e /
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a ]EnB`g(4;
manner defined by the Bezier parameterization option. Please see Chapter 5 of AT<K>&)
the LightTools Core Module User’s Guide for more information. With the (]w_}E]N
current parameter values, the Bezier option varies the bump spacing along the iyB02\d
length of the light guide. The spacing in the orthogonal direction is constant. K9njD#/
The X and Y refer to the local coordinate system of the surface. kl?U 2A.=
LightTools Introductory Tutorial * 91 I+ rHb<
P%
g"EvMv&
HAPTER 5 Introduction to Backlight Design A0m
C ?w#V<3=
Examining Surface Properties ['~3"lK^O
Using the methods described in previous chapters, you may want to check your a:r8Jzr
model before you run a simulation. -+Axa[,5=
Click on various parts of the model in the 3D Design View. Or use the System EeIV6ug
Navigator to select different surfaces and view their Properties. yH|[K=?S[
1.In the System Navigator, click to open BottomSurface of the LightGuide, then 8`v+yHjG
click Zones, and then click Texture. MRR 5j;4GK
2.Select SphericalElement, and then right-click and select Properties from the % YkJ A:
shortcut menu. The Shape tab shows you a graphical representation of the f*,jh J_I
spherical bump shape that is the bottom of the light guide. oM G8?p
You might be curious as to why you cannot see the 3D texture property zones you ]i(tou-[i
defined. They are invisible by default, because drawing thousands of texture x{6KsYEY
elements can make displaying and exploring the model somewhat slow. If you Dt%G v0
choose to make them visible, 3D textures are displayed in wireframe, even if the V7U& 8UPb
display mode is set to translucent. Wireframe rendering displays a bit faster and _PL Y<i2vr
shows more of the technical details. 5^<X:1J$
92 * LightTools Introductory Tutorial A'vQ tlvKA
J3fk3d`2
HAPTER 5 Introduction to Backlight Design t~H'Ugv^
C 'r~,~ A I
1.Rotate and zoom the model to that you can see something like the illustration sD H^l )4h
below: w#vSZbh
. &_Z e@Ir-
2.To reveal the Property Zones: mk(O..)2
a.Right-click in the Design View and select View Preferences to display this |5oK 04<
dialog box.
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b.On the Visibility tab, click the Property Zone check box to turn it on. $M{MOehZ
c.Click OK. ?oana%
You will see the wire frame rendering of the spherical bumps on the x)N$.7'9OJ
bottom surface, and a solid color above it. The solid color is the 3D texture H=Scrvfx
of the BEFs (brightness-enhancing films) built automatically by the utility.
