The default number of bumps is 100 (10 X 10). You need to change these & l?AC%a5
parameters to match your design. Note that LightTools allows many other
IA680^
placement options, but you will use the Bezier placement option for this ;bRyk#
example. :s>x~t8g#n
5.On both the X Placement tab and Y Placement tab, change the Number of oMHTB!A=2
Bumps parameter to 300, as shown in the following figure. Click Apply after ~Aw.= Yi=
each change. HMmB90P`
6.Click OK to close the dialog box. a6!|#rt
Note that the number of bumps is 300 X 300, which results in about 90,000 RZ P7h>y6@
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a e-* -91D
manner defined by the Bezier parameterization option. Please see Chapter 5 of frT<9$QUL
the LightTools Core Module User’s Guide for more information. With the -mw`f)?Ev
current parameter values, the Bezier option varies the bump spacing along the R'Uf#.
length of the light guide. The spacing in the orthogonal direction is constant. aKz:hG
The X and Y refer to the local coordinate system of the surface. I`;SA~5
LightTools Introductory Tutorial * 91 y~^-I5!_ u
Bu"5NB
HAPTER 5 Introduction to Backlight Design 58P[EM hL
C n }/ 4em?
Examining Surface Properties K/ M2L&C
Using the methods described in previous chapters, you may want to check your nYE%@Up
model before you run a simulation. |dhKe g_
Click on various parts of the model in the 3D Design View. Or use the System v n4z C
Navigator to select different surfaces and view their Properties. DB3qf>@ ?
1.In the System Navigator, click to open BottomSurface of the LightGuide, then %"^8$A?>,k
click Zones, and then click Texture. "{[\VsX|c
2.Select SphericalElement, and then right-click and select Properties from the ym_p 49
shortcut menu. The Shape tab shows you a graphical representation of the H{hzw&dZ<P
spherical bump shape that is the bottom of the light guide. }CL7h;5N 3
You might be curious as to why you cannot see the 3D texture property zones you mM.YZUX
defined. They are invisible by default, because drawing thousands of texture %rJ 'DPs
elements can make displaying and exploring the model somewhat slow. If you n
j2=}6
choose to make them visible, 3D textures are displayed in wireframe, even if the GglGFXOL-
display mode is set to translucent. Wireframe rendering displays a bit faster and G`RQl@W>)(
shows more of the technical details. 2P ^x'I
92 * LightTools Introductory Tutorial \P7<q,OGS
3,- [lG@o
HAPTER 5 Introduction to Backlight Design es<8"CcP
C MUSsanCA
1.Rotate and zoom the model to that you can see something like the illustration f+1@mGt
below: i h-J{1
. sLUOs]cj
2.To reveal the Property Zones: - 5JN`
a.Right-click in the Design View and select View Preferences to display this Kc, i$FH
dialog box. j 4I ~
b.On the Visibility tab, click the Property Zone check box to turn it on. d,toU I
c.Click OK. .y<u+)
You will see the wire frame rendering of the spherical bumps on the 54=*vokX_
bottom surface, and a solid color above it. The solid color is the 3D texture aa" 3
Io
of the BEFs (brightness-enhancing films) built automatically by the utility.
