The default number of bumps is 100 (10 X 10). You need to change these J[{ R:l\
parameters to match your design. Note that LightTools allows many other 03 n+kh
placement options, but you will use the Bezier placement option for this g8R@ol 0
example. #e[S+a
5.On both the X Placement tab and Y Placement tab, change the Number of +<T361eyY
Bumps parameter to 300, as shown in the following figure. Click Apply after B)x^S
>
each change. :-Wh' H(
6.Click OK to close the dialog box. E{'Y>g B6
Note that the number of bumps is 300 X 300, which results in about 90,000 R('\i/fy
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a
/s~BE ,su
manner defined by the Bezier parameterization option. Please see Chapter 5 of _ G$21=
the LightTools Core Module User’s Guide for more information. With the ?>1wZ
current parameter values, the Bezier option varies the bump spacing along the Y1;jRIOA
length of the light guide. The spacing in the orthogonal direction is constant. P\y ZcL
The X and Y refer to the local coordinate system of the surface. v'Pb x
LightTools Introductory Tutorial * 91 q:1n=i Ei
12V-EG i
HAPTER 5 Introduction to Backlight Design * m8{yh
C L=@8Z i!2<
Examining Surface Properties $ 3S`A]xO
Using the methods described in previous chapters, you may want to check your sk5B} -
model before you run a simulation. K1=j7
Click on various parts of the model in the 3D Design View. Or use the System ,z01 *Yx
Navigator to select different surfaces and view their Properties. u f1s}/M
1.In the System Navigator, click to open BottomSurface of the LightGuide, then q8)w Al
click Zones, and then click Texture. ;v!Ef"E|cV
2.Select SphericalElement, and then right-click and select Properties from the BS2'BS8
shortcut menu. The Shape tab shows you a graphical representation of the 3T
/_#=9TV
spherical bump shape that is the bottom of the light guide. E&ReQgBft
You might be curious as to why you cannot see the 3D texture property zones you ' ,1[rWyc
defined. They are invisible by default, because drawing thousands of texture t9.| i H
elements can make displaying and exploring the model somewhat slow. If you EeQ2 \'t
choose to make them visible, 3D textures are displayed in wireframe, even if the Z kBWVZb
display mode is set to translucent. Wireframe rendering displays a bit faster and 3fUiYI|&7
shows more of the technical details. U J uz
92 * LightTools Introductory Tutorial ? r}2JHvN
@,{Qa!A>l
HAPTER 5 Introduction to Backlight Design Ri3*au/Q
C yb-4[C:i
1.Rotate and zoom the model to that you can see something like the illustration T3Sz<K$E
below: hT%
>) 71
. , =[r6k<
2.To reveal the Property Zones: !Ld[`d.|R!
a.Right-click in the Design View and select View Preferences to display this ^e]h\G
dialog box. /vPr^Wv
b.On the Visibility tab, click the Property Zone check box to turn it on. R1Fcd@DWD
c.Click OK. P\h1%a/D
You will see the wire frame rendering of the spherical bumps on the JH#p;7;
bottom surface, and a solid color above it. The solid color is the 3D texture {Q)sR*d
of the BEFs (brightness-enhancing films) built automatically by the utility.
