The default number of bumps is 100 (10 X 10). You need to change these 0q^>ZF-@
parameters to match your design. Note that LightTools allows many other LmRy1T,act
placement options, but you will use the Bezier placement option for this 2"C OP>
example. O6@j &*jS
5.On both the X Placement tab and Y Placement tab, change the Number of .[YuRLGz
Bumps parameter to 300, as shown in the following figure. Click Apply after )"qa k T
each change. n #mA/H;wV
6.Click OK to close the dialog box. Y h7rU?Gj
Note that the number of bumps is 300 X 300, which results in about 90,000 .Q<>-3\K
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a 9U7nKJ+iby
manner defined by the Bezier parameterization option. Please see Chapter 5 of 3v(* 5
the LightTools Core Module User’s Guide for more information. With the G3C~x.(f
current parameter values, the Bezier option varies the bump spacing along the GL&y@6
length of the light guide. The spacing in the orthogonal direction is constant. Z~GL5]S
The X and Y refer to the local coordinate system of the surface. 3N 8t`N
LightTools Introductory Tutorial * 91 +u.1 ;qF
fAF1"4f
HAPTER 5 Introduction to Backlight Design Ii6<b6-
C o5d%w-'
Examining Surface Properties _ "E$ v&_
Using the methods described in previous chapters, you may want to check your P)"noG_'i
model before you run a simulation. /J ta^Bj
Click on various parts of the model in the 3D Design View. Or use the System uMUBh 80,L
Navigator to select different surfaces and view their Properties. lVd^
^T*fh
1.In the System Navigator, click to open BottomSurface of the LightGuide, then vjLJi nJ/
click Zones, and then click Texture. eJ,/:=QQ{
2.Select SphericalElement, and then right-click and select Properties from the 02Y]`CXj
shortcut menu. The Shape tab shows you a graphical representation of the =pr ` '
spherical bump shape that is the bottom of the light guide. rW<KKGsRWQ
You might be curious as to why you cannot see the 3D texture property zones you w?3p';C
defined. They are invisible by default, because drawing thousands of texture v/@^Q1 G/:
elements can make displaying and exploring the model somewhat slow. If you ^9m\=5d
choose to make them visible, 3D textures are displayed in wireframe, even if the >1s*
at/h
display mode is set to translucent. Wireframe rendering displays a bit faster and K'5 5O&2
shows more of the technical details. t9nqu!);
92 * LightTools Introductory Tutorial 7Sf
bx~48
!1rlN8w(qr
HAPTER 5 Introduction to Backlight Design 9 *xR6
C ``V"
D
1.Rotate and zoom the model to that you can see something like the illustration !]4 2^?GH
below: SII;n2[Ze
. v>:Ur}u!D
2.To reveal the Property Zones: d^@ dzNv
a.Right-click in the Design View and select View Preferences to display this yUeCc"Vf
dialog box. -^K"ZP1
b.On the Visibility tab, click the Property Zone check box to turn it on. %}[i'rT>
c.Click OK. ]99|KQ<s
You will see the wire frame rendering of the spherical bumps on the 0\H\lKcK
bottom surface, and a solid color above it. The solid color is the 3D texture yZ
@"\Z!
of the BEFs (brightness-enhancing films) built automatically by the utility.
