The default number of bumps is 100 (10 X 10). You need to change these {[ #)Q.2
parameters to match your design. Note that LightTools allows many other 8!|vp7/
placement options, but you will use the Bezier placement option for this 9vP;i= fr
example. mDz44XO
5.On both the X Placement tab and Y Placement tab, change the Number of F oC
$X
Bumps parameter to 300, as shown in the following figure. Click Apply after ,z.l#hj,{
each change. ewd
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6.Click OK to close the dialog box. kr+p&| .
Note that the number of bumps is 300 X 300, which results in about 90,000
M J ch
Z
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a Awa| (]
manner defined by the Bezier parameterization option. Please see Chapter 5 of lS9S7`
the LightTools Core Module User’s Guide for more information. With the .iy>N/u
current parameter values, the Bezier option varies the bump spacing along the _|US`,kfc
length of the light guide. The spacing in the orthogonal direction is constant. tkZUjQIX
The X and Y refer to the local coordinate system of the surface. D& F{0
LightTools Introductory Tutorial * 91 R/x3+_.f
Q k}R cP
HAPTER 5 Introduction to Backlight Design D& pn@6bB
C ;Tr,BfV|Bf
Examining Surface Properties m6 [ }KkW
Using the methods described in previous chapters, you may want to check your ymxA<bICS8
model before you run a simulation. />mK .FT
Click on various parts of the model in the 3D Design View. Or use the System f~wON>$K
Navigator to select different surfaces and view their Properties. X PyDZk/m
1.In the System Navigator, click to open BottomSurface of the LightGuide, then "x9yb0
click Zones, and then click Texture. j~>{P=_}
2.Select SphericalElement, and then right-click and select Properties from the J @:Q(
shortcut menu. The Shape tab shows you a graphical representation of the Oe1WnS 7(]
spherical bump shape that is the bottom of the light guide. wp&G ]/4m
You might be curious as to why you cannot see the 3D texture property zones you A 0 Nx?
defined. They are invisible by default, because drawing thousands of texture m|W17LhW{
elements can make displaying and exploring the model somewhat slow. If you u ,3B[
choose to make them visible, 3D textures are displayed in wireframe, even if the aGC3&c[Wx
display mode is set to translucent. Wireframe rendering displays a bit faster and hUi@T}aA|
shows more of the technical details. "6\ 5eFN;
92 * LightTools Introductory Tutorial 9no<;1+j,
pM@8T2 5=
HAPTER 5 Introduction to Backlight Design N-QS/*C.~
C Z pg;hj5_
1.Rotate and zoom the model to that you can see something like the illustration Ht;Rz*}
below: cZ_)'0
. vQLYWRXiA
2.To reveal the Property Zones: 2pdeJ
a.Right-click in the Design View and select View Preferences to display this ,5v'hG
dialog box. g0j)k6<6(Y
b.On the Visibility tab, click the Property Zone check box to turn it on. c +3`hVV
c.Click OK. P6.PjK!Ar
You will see the wire frame rendering of the spherical bumps on the J-tqEK*
bottom surface, and a solid color above it. The solid color is the 3D texture $ h
p UI
of the BEFs (brightness-enhancing films) built automatically by the utility.
