The default number of bumps is 100 (10 X 10). You need to change these T f;:C]
parameters to match your design. Note that LightTools allows many other Egr'IbB
placement options, but you will use the Bezier placement option for this Kb,#Ot
example. 8PtX@s43\
5.On both the X Placement tab and Y Placement tab, change the Number of U9]&~jR
Bumps parameter to 300, as shown in the following figure. Click Apply after lJ/{.uK
each change. 0D:e P``
6.Click OK to close the dialog box. m?_@.O@]
Note that the number of bumps is 300 X 300, which results in about 90,000 IM$I=5y e
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a `6QQS3fk!
manner defined by the Bezier parameterization option. Please see Chapter 5 of "pW@[2Dkx/
the LightTools Core Module User’s Guide for more information. With the / o ]j
current parameter values, the Bezier option varies the bump spacing along the m. DC
length of the light guide. The spacing in the orthogonal direction is constant. L$4nbOu\~
The X and Y refer to the local coordinate system of the surface. qbu5aK}+
LightTools Introductory Tutorial * 91 #, PB(
$G@ ^!(
HAPTER 5 Introduction to Backlight Design 7 R5!(g
C #23m_w^L
Examining Surface Properties f+W8Gszi
Using the methods described in previous chapters, you may want to check your tj;<EaM
model before you run a simulation. <N}*|z7=b
Click on various parts of the model in the 3D Design View. Or use the System 11 jDAA(|
Navigator to select different surfaces and view their Properties. bdz&"\$X
1.In the System Navigator, click to open BottomSurface of the LightGuide, then CY
i{ WV(:
click Zones, and then click Texture. ygS vYMC
2.Select SphericalElement, and then right-click and select Properties from the ct-;L' a
shortcut menu. The Shape tab shows you a graphical representation of the [$P .ek<
spherical bump shape that is the bottom of the light guide. &7m)K>E27
You might be curious as to why you cannot see the 3D texture property zones you %2t#>}If!
defined. They are invisible by default, because drawing thousands of texture g"o),$ tm
elements can make displaying and exploring the model somewhat slow. If you 3&ES?MyB#
choose to make them visible, 3D textures are displayed in wireframe, even if the Ad ]oM]
display mode is set to translucent. Wireframe rendering displays a bit faster and SdOE^_@:
shows more of the technical details. * Qe{CE
92 * LightTools Introductory Tutorial >W7IWhm3
-y5Z c?e
HAPTER 5 Introduction to Backlight Design `UH 1B/
C >HlQ+bl$xw
1.Rotate and zoom the model to that you can see something like the illustration 1l`$. k
below: <=7N2t)s4
. k>;a5'S
2.To reveal the Property Zones: PquATAzQA
a.Right-click in the Design View and select View Preferences to display this <"rckPv_H
dialog box. S+Vsy(
b.On the Visibility tab, click the Property Zone check box to turn it on. WA&&*ae5`
c.Click OK. Y\1XKAfB
You will see the wire frame rendering of the spherical bumps on the Vuu_Sd
bottom surface, and a solid color above it. The solid color is the 3D texture %V&I${z
of the BEFs (brightness-enhancing films) built automatically by the utility.
