The default number of bumps is 100 (10 X 10). You need to change these "T^%HPif
parameters to match your design. Note that LightTools allows many other X`WS&!C<
placement options, but you will use the Bezier placement option for this |? fAe {*
example. Wex2Fd?DO
5.On both the X Placement tab and Y Placement tab, change the Number of $t}W,?
Bumps parameter to 300, as shown in the following figure. Click Apply after $|J+
each change. AA=rjB9
6.Click OK to close the dialog box. '<<@@.(f
Note that the number of bumps is 300 X 300, which results in about 90,000 %$ Py @g
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a S hy. :XI
manner defined by the Bezier parameterization option. Please see Chapter 5 of [f lK
the LightTools Core Module User’s Guide for more information. With the G/},lUzLg
current parameter values, the Bezier option varies the bump spacing along the F
{L#
length of the light guide. The spacing in the orthogonal direction is constant. Q (yg bT
The X and Y refer to the local coordinate system of the surface. F*Hov xez
LightTools Introductory Tutorial * 91 I ZLCwaW
pKj: )6t"
HAPTER 5 Introduction to Backlight Design Te?PYV-
C X o9vE3
Examining Surface Properties N}7 b^0k
Using the methods described in previous chapters, you may want to check your C(B"@
model before you run a simulation. U;
<{P
Click on various parts of the model in the 3D Design View. Or use the System sn^ 3xAF
Navigator to select different surfaces and view their Properties. DBcR1c&<H
1.In the System Navigator, click to open BottomSurface of the LightGuide, then c U(z5th
click Zones, and then click Texture. c7@/<*E+
2.Select SphericalElement, and then right-click and select Properties from the M!!vr8}
shortcut menu. The Shape tab shows you a graphical representation of the uaKb qX
spherical bump shape that is the bottom of the light guide. 1D8S }=5&
You might be curious as to why you cannot see the 3D texture property zones you |IzL4>m:;
defined. They are invisible by default, because drawing thousands of texture ~p
n$'1Q
elements can make displaying and exploring the model somewhat slow. If you 0]'
2i
choose to make them visible, 3D textures are displayed in wireframe, even if the -UzWLVB^
display mode is set to translucent. Wireframe rendering displays a bit faster and Nb_ Glf
shows more of the technical details. MMET^SO
92 * LightTools Introductory Tutorial DO*6gzW
sg}<()
HAPTER 5 Introduction to Backlight Design W1 xPK*
C Lk#)VGk:
1.Rotate and zoom the model to that you can see something like the illustration b`S9#`
below: hslT49m>
. v< 2,OcH
2.To reveal the Property Zones: H\<0{#F
a.Right-click in the Design View and select View Preferences to display this Z"w}`&TC$^
dialog box. |P| 2E~[r
b.On the Visibility tab, click the Property Zone check box to turn it on. t!J>853
c.Click OK. Sw-2vnSdM
You will see the wire frame rendering of the spherical bumps on the dJ])`S
bottom surface, and a solid color above it. The solid color is the 3D texture aCQ[Uc<B:
of the BEFs (brightness-enhancing films) built automatically by the utility.
