The default number of bumps is 100 (10 X 10). You need to change these pH1 !6X
parameters to match your design. Note that LightTools allows many other gxv^=;2C
placement options, but you will use the Bezier placement option for this 4 Z"}W!A
example. ~dYCY_a
5.On both the X Placement tab and Y Placement tab, change the Number of /Nf{;G !kg
Bumps parameter to 300, as shown in the following figure. Click Apply after |kYlh5/c d
each change. cm< #zu3~S
6.Click OK to close the dialog box. 7 *!7EBb
Note that the number of bumps is 300 X 300, which results in about 90,000 N~v6K}`}
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a Eu K}L[Kl
manner defined by the Bezier parameterization option. Please see Chapter 5 of ~KBa-i%o
the LightTools Core Module User’s Guide for more information. With the Hr|f(9xA
current parameter values, the Bezier option varies the bump spacing along the i9 ;
length of the light guide. The spacing in the orthogonal direction is constant. z5E%*]
The X and Y refer to the local coordinate system of the surface. /( Wq
LightTools Introductory Tutorial * 91 T8XrmR&?PX
V(MYReaPC]
HAPTER 5 Introduction to Backlight Design ,i 2-
C [jMN *p?
Examining Surface Properties xE/?ncTK^
Using the methods described in previous chapters, you may want to check your e97G]XLR
model before you run a simulation. |N.2iN:
Click on various parts of the model in the 3D Design View. Or use the System 7o E 0;'
Navigator to select different surfaces and view their Properties. |R`"Zu`
1.In the System Navigator, click to open BottomSurface of the LightGuide, then f9.?+.^_
click Zones, and then click Texture. -'! J?~
2.Select SphericalElement, and then right-click and select Properties from the T+kV~ w{
shortcut menu. The Shape tab shows you a graphical representation of the ^q:-ZgM>
spherical bump shape that is the bottom of the light guide. hbw(o
You might be curious as to why you cannot see the 3D texture property zones you =+zDE0Qs
defined. They are invisible by default, because drawing thousands of texture 4&iQo'
elements can make displaying and exploring the model somewhat slow. If you 5'AP:3Gf"
choose to make them visible, 3D textures are displayed in wireframe, even if the &N~Eu-@b
display mode is set to translucent. Wireframe rendering displays a bit faster and 5S~ H[>A"
shows more of the technical details. >>U>'}@Q
92 * LightTools Introductory Tutorial c4Ebre-Oa
7EJ2 On
HAPTER 5 Introduction to Backlight Design %~u]|q<{
C hFrMOc&
1.Rotate and zoom the model to that you can see something like the illustration LP 2~UVq
below: # @R0$x
. F B]Y~;(
2.To reveal the Property Zones: $%bSRvA
a.Right-click in the Design View and select View Preferences to display this M 5dYcCDE
dialog box. %B s. XW,
b.On the Visibility tab, click the Property Zone check box to turn it on. pgU [di
c.Click OK. /0s1;?
You will see the wire frame rendering of the spherical bumps on the sp Edq}
bottom surface, and a solid color above it. The solid color is the 3D texture ci0A!wWD
of the BEFs (brightness-enhancing films) built automatically by the utility.
