The default number of bumps is 100 (10 X 10). You need to change these 4u.Fy<+@4M
parameters to match your design. Note that LightTools allows many other }Jr!a M'
placement options, but you will use the Bezier placement option for this aR0'$*3E
example. c ?H@HoF
5.On both the X Placement tab and Y Placement tab, change the Number of @cC@(M~Ru
Bumps parameter to 300, as shown in the following figure. Click Apply after '1r<g\ l
each change. ys~oJb~
6.Click OK to close the dialog box. } S,KUH.
Note that the number of bumps is 300 X 300, which results in about 90,000 lK 0pr
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a lI*uF~ 'D
manner defined by the Bezier parameterization option. Please see Chapter 5 of c ?(X (FQ
the LightTools Core Module User’s Guide for more information. With the bnYd1 9>
current parameter values, the Bezier option varies the bump spacing along the |h6 u%t2AY
length of the light guide. The spacing in the orthogonal direction is constant. BdQ/k XZu+
The X and Y refer to the local coordinate system of the surface. J'H}e F`
LightTools Introductory Tutorial * 91 )U5Ba^"fI
XQhbH^
HAPTER 5 Introduction to Backlight Design _ \LP P_
C u>y/<9]q8
Examining Surface Properties W~ i599!v
Using the methods described in previous chapters, you may want to check your I #8T Y/XP
model before you run a simulation. 4!k 0
Click on various parts of the model in the 3D Design View. Or use the System - D&d1 `N4
Navigator to select different surfaces and view their Properties. Rx fhk,I
1.In the System Navigator, click to open BottomSurface of the LightGuide, then j+6`nN7L
click Zones, and then click Texture. D%%@+3a
2.Select SphericalElement, and then right-click and select Properties from the .2v)x
shortcut menu. The Shape tab shows you a graphical representation of the Sz'H{?"
spherical bump shape that is the bottom of the light guide. Gj ka %
You might be curious as to why you cannot see the 3D texture property zones you :% m56
defined. They are invisible by default, because drawing thousands of texture o_@6R"|
elements can make displaying and exploring the model somewhat slow. If you Hph$Z 1{
choose to make them visible, 3D textures are displayed in wireframe, even if the 'irHpN6n
display mode is set to translucent. Wireframe rendering displays a bit faster and >)6d~
shows more of the technical details. |J:kL3g
92 * LightTools Introductory Tutorial *ud/'HR8]
$z[r (a^a
HAPTER 5 Introduction to Backlight Design n{8v^x
C X*QQVj
1.Rotate and zoom the model to that you can see something like the illustration t[=teB v<
below: ^EF VjGM
. Y U6D;
2.To reveal the Property Zones: CjT]!D)s
a.Right-click in the Design View and select View Preferences to display this O ;C C (
dialog box. 9>7w1G#
b.On the Visibility tab, click the Property Zone check box to turn it on. r
t\eze_5A
c.Click OK. |: b !e
You will see the wire frame rendering of the spherical bumps on the <<~swN
bottom surface, and a solid color above it. The solid color is the 3D texture ^P~NE#p5
of the BEFs (brightness-enhancing films) built automatically by the utility.
