The default number of bumps is 100 (10 X 10). You need to change these +8T^q,
parameters to match your design. Note that LightTools allows many other uMS+,dXy
placement options, but you will use the Bezier placement option for this \ /o$io,kV
example. (Y@T5-!D
5.On both the X Placement tab and Y Placement tab, change the Number of Xa?O)Bq .
Bumps parameter to 300, as shown in the following figure. Click Apply after 6 AGZ)gX
each change. "8{A4N1B5
6.Click OK to close the dialog box. *_o(~5w-K
Note that the number of bumps is 300 X 300, which results in about 90,000 voRry6Q;
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a 4^F% bXJ)
manner defined by the Bezier parameterization option. Please see Chapter 5 of %gh#gH
the LightTools Core Module User’s Guide for more information. With the I /MY4?(T
current parameter values, the Bezier option varies the bump spacing along the ]myRYb5Z
length of the light guide. The spacing in the orthogonal direction is constant. L2ydyXIsd
The X and Y refer to the local coordinate system of the surface. #e|o"R;/`
LightTools Introductory Tutorial * 91 ]A'{DKR
yXJ25Axb
HAPTER 5 Introduction to Backlight Design h<`aL;.g
C kz7F QE
Examining Surface Properties R[ a-"
Using the methods described in previous chapters, you may want to check your '\tI|
model before you run a simulation. ~\jP+ [>M'
Click on various parts of the model in the 3D Design View. Or use the System VP~2F
E
Navigator to select different surfaces and view their Properties. *;Mi/^pzK
1.In the System Navigator, click to open BottomSurface of the LightGuide, then Qs6Vu)U=
click Zones, and then click Texture. Q L WnP-
2.Select SphericalElement, and then right-click and select Properties from the a (~Y:v
shortcut menu. The Shape tab shows you a graphical representation of the f
+{=##'0
spherical bump shape that is the bottom of the light guide.
D}98ZKi
You might be curious as to why you cannot see the 3D texture property zones you ^{4BcM 7eH
defined. They are invisible by default, because drawing thousands of texture yx :^*/
elements can make displaying and exploring the model somewhat slow. If you K8;SE !
choose to make them visible, 3D textures are displayed in wireframe, even if the 25$_tZP AI
display mode is set to translucent. Wireframe rendering displays a bit faster and Zj2 si
shows more of the technical details. * 9^8NY]
92 * LightTools Introductory Tutorial si]VM_w6
z'EQdQ)
HAPTER 5 Introduction to Backlight Design P 1Hab2%+
C c$Kc,`2m7
1.Rotate and zoom the model to that you can see something like the illustration 4]h/t&ppq
below: j Q5 F}
. u
]e-IYH
2.To reveal the Property Zones: Y sVmU
a.Right-click in the Design View and select View Preferences to display this c>_ti +
dialog box. p"ZvA^d\
b.On the Visibility tab, click the Property Zone check box to turn it on. d:(Ex^^
c.Click OK. ES~b f
You will see the wire frame rendering of the spherical bumps on the hG?y)g\A
bottom surface, and a solid color above it. The solid color is the 3D texture d m8t ~38
of the BEFs (brightness-enhancing films) built automatically by the utility.
