The default number of bumps is 100 (10 X 10). You need to change these ?hv PPE Jf
parameters to match your design. Note that LightTools allows many other A D =@
placement options, but you will use the Bezier placement option for this aOfL;I
example. oC>e'_6_b
5.On both the X Placement tab and Y Placement tab, change the Number of Z5;1ySn{
Bumps parameter to 300, as shown in the following figure. Click Apply after )I{41/_YA
each change. |\2z w _o
6.Click OK to close the dialog box. >-
]tOH,0
Note that the number of bumps is 300 X 300, which results in about 90,000
:Ts"f*
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a O^|dc=
manner defined by the Bezier parameterization option. Please see Chapter 5 of 2hAu~#X
the LightTools Core Module User’s Guide for more information. With the `GS!$9j
current parameter values, the Bezier option varies the bump spacing along the : L&Bbw (
length of the light guide. The spacing in the orthogonal direction is constant. E"bYl3
The X and Y refer to the local coordinate system of the surface. d b^S@}
LightTools Introductory Tutorial * 91 vb)Z&V6(
zx'G0Z9]
HAPTER 5 Introduction to Backlight Design ?1i>b- >
C }rsD$
Examining Surface Properties [Rw0']i`4
Using the methods described in previous chapters, you may want to check your r]B wp i%
model before you run a simulation. x;S v&
Click on various parts of the model in the 3D Design View. Or use the System +4f>njARIb
Navigator to select different surfaces and view their Properties. z:bxnM2\
1.In the System Navigator, click to open BottomSurface of the LightGuide, then (%"M% Qko
click Zones, and then click Texture. u _s
2.Select SphericalElement, and then right-click and select Properties from the w-};\]I
shortcut menu. The Shape tab shows you a graphical representation of the y$7Fq'
spherical bump shape that is the bottom of the light guide. ;$l!mv 7
You might be curious as to why you cannot see the 3D texture property zones you k'}}eu/ q
defined. They are invisible by default, because drawing thousands of texture r^-3( 77n
elements can make displaying and exploring the model somewhat slow. If you aiGT!2
choose to make them visible, 3D textures are displayed in wireframe, even if the dG}fpQ3&
display mode is set to translucent. Wireframe rendering displays a bit faster and 16)@<7b]J
shows more of the technical details. 6c>t|=Ss(
92 * LightTools Introductory Tutorial vC[)/w
xi8RE@gm
HAPTER 5 Introduction to Backlight Design d_ gm'
C o0&jel1a
1.Rotate and zoom the model to that you can see something like the illustration L B1 ui
below: Lg pj<H[
. y 562g`"U
2.To reveal the Property Zones: F h9`8
a.Right-click in the Design View and select View Preferences to display this 6tB-
dialog box. dQ@ e+u5
b.On the Visibility tab, click the Property Zone check box to turn it on. &e@2zfl7
c.Click OK. bVSa}&*k M
You will see the wire frame rendering of the spherical bumps on the 1u7 5
bottom surface, and a solid color above it. The solid color is the 3D texture A;m)/@
of the BEFs (brightness-enhancing films) built automatically by the utility.
