The default number of bumps is 100 (10 X 10). You need to change these ^\=<geEj
parameters to match your design. Note that LightTools allows many other 5%,5Xe4p
placement options, but you will use the Bezier placement option for this 4FURm@C6
example. 9IJBK
5.On both the X Placement tab and Y Placement tab, change the Number of <[mT *
Bumps parameter to 300, as shown in the following figure. Click Apply after AjBwj5K
each change. =@ (&xfTC
6.Click OK to close the dialog box. -|;{/ s5
Note that the number of bumps is 300 X 300, which results in about 90,000 "D#+:ix8G|
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a {FRUB(68b
manner defined by the Bezier parameterization option. Please see Chapter 5 of Kn- cwz5
the LightTools Core Module User’s Guide for more information. With the -7E)u
current parameter values, the Bezier option varies the bump spacing along the gDbj!(tm
length of the light guide. The spacing in the orthogonal direction is constant. d-/{@
The X and Y refer to the local coordinate system of the surface. 6;s.%W
LightTools Introductory Tutorial * 91 K8[vJ7(!|
w#|uR ^~
HAPTER 5 Introduction to Backlight Design !9A6DWA E$
C _9 y b5_
Examining Surface Properties j}9][Fm1*
Using the methods described in previous chapters, you may want to check your $yxwB/ O(
model before you run a simulation. }e$^v* 16
Click on various parts of the model in the 3D Design View. Or use the System tt5t(+5j
Navigator to select different surfaces and view their Properties. /}+VH_N1
1.In the System Navigator, click to open BottomSurface of the LightGuide, then |f5WN&c
click Zones, and then click Texture. 6S]K@C=r
2.Select SphericalElement, and then right-click and select Properties from the SOE 5`
shortcut menu. The Shape tab shows you a graphical representation of the ) CgKZ"
spherical bump shape that is the bottom of the light guide. W^j;"qj
You might be curious as to why you cannot see the 3D texture property zones you j9Qd
45
defined. They are invisible by default, because drawing thousands of texture >YG1sMV-J
elements can make displaying and exploring the model somewhat slow. If you KnL- qc
choose to make them visible, 3D textures are displayed in wireframe, even if the #r5IwyL
display mode is set to translucent. Wireframe rendering displays a bit faster and NGQBOV
shows more of the technical details. qe. Qjq
92 * LightTools Introductory Tutorial ^h wF=
Zo$ ,{rl
HAPTER 5 Introduction to Backlight Design l0Rjq*5hJ
C fny|^F]w
1.Rotate and zoom the model to that you can see something like the illustration Y9V%eFY5E
below: K"Vo'9R[_
. D{'>G @nLQ
2.To reveal the Property Zones: WX.6 |
a.Right-click in the Design View and select View Preferences to display this Dp1FX" a)
dialog box. i vTx6-]
b.On the Visibility tab, click the Property Zone check box to turn it on. {Hc [H-
c.Click OK. 25EuVj`zL
You will see the wire frame rendering of the spherical bumps on the pXn(#n<
bottom surface, and a solid color above it. The solid color is the 3D texture iczJXA+
of the BEFs (brightness-enhancing films) built automatically by the utility.
