The default number of bumps is 100 (10 X 10). You need to change these b Ot6q/f
parameters to match your design. Note that LightTools allows many other CLb~ 6LD
placement options, but you will use the Bezier placement option for this C6=P(%y
example. y |BRAk&n
5.On both the X Placement tab and Y Placement tab, change the Number of Rn (vG-xQ
Bumps parameter to 300, as shown in the following figure. Click Apply after A/XY' 3
each change. 5Iv3B|u
6.Click OK to close the dialog box. B I '}
Note that the number of bumps is 300 X 300, which results in about 90,000 om`x"x&6
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a &i&k 4
manner defined by the Bezier parameterization option. Please see Chapter 5 of +bG^SH2ke
the LightTools Core Module User’s Guide for more information. With the Q-3o k7
current parameter values, the Bezier option varies the bump spacing along the g:l5,j .K
length of the light guide. The spacing in the orthogonal direction is constant. }=1#ANM1
The X and Y refer to the local coordinate system of the surface. l ( EDe
LightTools Introductory Tutorial * 91 Svs!C+:le
~ nQv
yM!$
HAPTER 5 Introduction to Backlight Design HA?<j|M
C kEH(\3,l
Examining Surface Properties 3yWu-U \k
Using the methods described in previous chapters, you may want to check your i?.7o*w8
model before you run a simulation. YEL, TU
Click on various parts of the model in the 3D Design View. Or use the System 5J d7<AO_
Navigator to select different surfaces and view their Properties. mgIB8D+6
1.In the System Navigator, click to open BottomSurface of the LightGuide, then r#ISIgJXG
click Zones, and then click Texture. I[ r
2.Select SphericalElement, and then right-click and select Properties from the C%$:Oq
shortcut menu. The Shape tab shows you a graphical representation of the 2S~cW./#fX
spherical bump shape that is the bottom of the light guide. q q%\
You might be curious as to why you cannot see the 3D texture property zones you FKT dQg|NZ
defined. They are invisible by default, because drawing thousands of texture N $8do?
elements can make displaying and exploring the model somewhat slow. If you uSeRn@
choose to make them visible, 3D textures are displayed in wireframe, even if the SLzxF uV
display mode is set to translucent. Wireframe rendering displays a bit faster and j.? '*?P
shows more of the technical details. (;f 7/2~`
92 * LightTools Introductory Tutorial -^C't_Q o
|\yVnk!c
HAPTER 5 Introduction to Backlight Design mVJW"*}8
C O5:?nD
1.Rotate and zoom the model to that you can see something like the illustration s*"Yi~
below: 3# {{+5G
. WE_jT1^/
2.To reveal the Property Zones: -8j<`(M' 5
a.Right-click in the Design View and select View Preferences to display this huMNt6P[
dialog box. BoJYP
b.On the Visibility tab, click the Property Zone check box to turn it on. vdwh59W
c.Click OK. qb^jcy
You will see the wire frame rendering of the spherical bumps on the |T!^&t
bottom surface, and a solid color above it. The solid color is the 3D texture bPaE;?m
of the BEFs (brightness-enhancing films) built automatically by the utility.
