The default number of bumps is 100 (10 X 10). You need to change these \P tC
parameters to match your design. Note that LightTools allows many other &oK/ ]lub
placement options, but you will use the Bezier placement option for this oRJP5Y5na
example. LTls]@N
5.On both the X Placement tab and Y Placement tab, change the Number of Sp r:K,
Bumps parameter to 300, as shown in the following figure. Click Apply after zf!\wY"`
each change. ?` ZGM
6.Click OK to close the dialog box. Y$`hudJ&
Note that the number of bumps is 300 X 300, which results in about 90,000 |2t7m at
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a E uimZW\V
manner defined by the Bezier parameterization option. Please see Chapter 5 of ^2?O+ =,F
the LightTools Core Module User’s Guide for more information. With the <K.C?M(9
current parameter values, the Bezier option varies the bump spacing along the p6eDd"Y
length of the light guide. The spacing in the orthogonal direction is constant. XtH_+W+O
The X and Y refer to the local coordinate system of the surface. ?\p%Mx?
LightTools Introductory Tutorial * 91 0.+Z;j
$nd-[x V
HAPTER 5 Introduction to Backlight Design wGQ hr="
C `))J8j"
Examining Surface Properties |EEz>ci
Using the methods described in previous chapters, you may want to check your BQfAe n]
model before you run a simulation. u4 *]jt;H
Click on various parts of the model in the 3D Design View. Or use the System o!_; H}pq
Navigator to select different surfaces and view their Properties. XGup,7e9
1.In the System Navigator, click to open BottomSurface of the LightGuide, then 3b[[2x_UU
click Zones, and then click Texture. p$!+2=)gY
2.Select SphericalElement, and then right-click and select Properties from the DSG +TA"
shortcut menu. The Shape tab shows you a graphical representation of the fM[fS?W
spherical bump shape that is the bottom of the light guide. q!h*3mNm
You might be curious as to why you cannot see the 3D texture property zones you (LvOsr~
defined. They are invisible by default, because drawing thousands of texture 'hHX"\|RA
elements can make displaying and exploring the model somewhat slow. If you 9oau _ Q#
choose to make them visible, 3D textures are displayed in wireframe, even if the [@?.}!
display mode is set to translucent. Wireframe rendering displays a bit faster and ][K8\
shows more of the technical details. G`JwAy r'
92 * LightTools Introductory Tutorial L!Zxc~
uB&I56
HAPTER 5 Introduction to Backlight Design ZzaW@6LJF
C {4jSj0W
1.Rotate and zoom the model to that you can see something like the illustration @f01xh=8
below: ;NVTn<Uj
. 9 C'+~<l
2.To reveal the Property Zones: A5H8+gATK
a.Right-click in the Design View and select View Preferences to display this Wes "t}[25
dialog box. #Uk6Fmu ]
b.On the Visibility tab, click the Property Zone check box to turn it on. -bb 7Y
c.Click OK. S$_Ts1Ge6
You will see the wire frame rendering of the spherical bumps on the Sw9mrhzJfe
bottom surface, and a solid color above it. The solid color is the 3D texture ]( 6vG $\
of the BEFs (brightness-enhancing films) built automatically by the utility.
