The default number of bumps is 100 (10 X 10). You need to change these 4
qMO@E_
parameters to match your design. Note that LightTools allows many other X~wkqI#d%E
placement options, but you will use the Bezier placement option for this %5.aC|^}
example. XG2&_u&
5.On both the X Placement tab and Y Placement tab, change the Number of %v
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Bumps parameter to 300, as shown in the following figure. Click Apply after r6k0=6i
each change. BBnW0v AZ*
6.Click OK to close the dialog box. PEqO<a1Z8
Note that the number of bumps is 300 X 300, which results in about 90,000 s }yJkQb
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a *[K\_F?^h
manner defined by the Bezier parameterization option. Please see Chapter 5 of )bN|*Bw3
the LightTools Core Module User’s Guide for more information. With the \l)<NZ\
current parameter values, the Bezier option varies the bump spacing along the O/b~TVA
length of the light guide. The spacing in the orthogonal direction is constant. wi]ya\(*yl
The X and Y refer to the local coordinate system of the surface. KZ_d..l*W
LightTools Introductory Tutorial * 91 r# ES|
M| r6"~i
HAPTER 5 Introduction to Backlight Design v|r\kr k
C U,Py+c6
Examining Surface Properties ;{' {*g[
Using the methods described in previous chapters, you may want to check your R(_UR)G0 @
model before you run a simulation. XwWp4`Fd
Click on various parts of the model in the 3D Design View. Or use the System ~gU. z6us
Navigator to select different surfaces and view their Properties. n/*BK;
1.In the System Navigator, click to open BottomSurface of the LightGuide, then v[4A_WjT
click Zones, and then click Texture. Zq w xi1
2.Select SphericalElement, and then right-click and select Properties from the e_ mUO"
shortcut menu. The Shape tab shows you a graphical representation of the /HCd52
spherical bump shape that is the bottom of the light guide. A0Z<1|6r*
You might be curious as to why you cannot see the 3D texture property zones you H{}0- 0o
defined. They are invisible by default, because drawing thousands of texture ;e~Z:;AR
elements can make displaying and exploring the model somewhat slow. If you ;:(kVdb
choose to make them visible, 3D textures are displayed in wireframe, even if the m Y[s2t
display mode is set to translucent. Wireframe rendering displays a bit faster and oS3}xT "
U
shows more of the technical details. V^Gz7`^
92 * LightTools Introductory Tutorial ` @ .
7)iB6RB K
HAPTER 5 Introduction to Backlight Design P%HvL4R
C 4-l G{I_S:
1.Rotate and zoom the model to that you can see something like the illustration ?M2#fD]e
below: n27df 9L
. ch2Q k8
2.To reveal the Property Zones: 8$Igo$U-
a.Right-click in the Design View and select View Preferences to display this eteq Mg}M
dialog box. wkSIQL
b.On the Visibility tab, click the Property Zone check box to turn it on. zQY|=4NP
c.Click OK. Hj&mwn]
You will see the wire frame rendering of the spherical bumps on the c6zghP3dR
bottom surface, and a solid color above it. The solid color is the 3D texture <?|v-(E
of the BEFs (brightness-enhancing films) built automatically by the utility.
