The default number of bumps is 100 (10 X 10). You need to change these t p3>aNj
parameters to match your design. Note that LightTools allows many other myV V5#{
placement options, but you will use the Bezier placement option for this 9\/T #E P
example. WJ{hta
5.On both the X Placement tab and Y Placement tab, change the Number of l
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Bumps parameter to 300, as shown in the following figure. Click Apply after Ch1+ YZG
each change. [U ]ouh)
6.Click OK to close the dialog box. [3s p
Note that the number of bumps is 300 X 300, which results in about 90,000 Vs1j9P|G
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a #L{+V ?
manner defined by the Bezier parameterization option. Please see Chapter 5 of !*0\Yi ,6
the LightTools Core Module User’s Guide for more information. With the Y=oj0(Q*
current parameter values, the Bezier option varies the bump spacing along the PC| U ]
length of the light guide. The spacing in the orthogonal direction is constant. .oJs"=h:m
The X and Y refer to the local coordinate system of the surface. Sd3KY9,
LightTools Introductory Tutorial * 91 m\h/D7zg
*ay>MlcV2=
HAPTER 5 Introduction to Backlight Design 1$q>\
C ICD(#m
Examining Surface Properties >+[uV ^2[
Using the methods described in previous chapters, you may want to check your Ty"OJ
model before you run a simulation. !9!kb
Click on various parts of the model in the 3D Design View. Or use the System Y2
&N#~l*
Navigator to select different surfaces and view their Properties. TU&t 1_6
1.In the System Navigator, click to open BottomSurface of the LightGuide, then 1@nGD<,.
click Zones, and then click Texture. # $:ddO Y
2.Select SphericalElement, and then right-click and select Properties from the 8?GS :+
shortcut menu. The Shape tab shows you a graphical representation of the ^N!l$&=
spherical bump shape that is the bottom of the light guide. cJ
G><'
You might be curious as to why you cannot see the 3D texture property zones you D!.
r$i)
defined. They are invisible by default, because drawing thousands of texture 41<.e` {
elements can make displaying and exploring the model somewhat slow. If you .(Gq9m[~8H
choose to make them visible, 3D textures are displayed in wireframe, even if the d9XX^nY.
display mode is set to translucent. Wireframe rendering displays a bit faster and y)W.x R
shows more of the technical details. ! af35WF
92 * LightTools Introductory Tutorial <} RU37,W
()}B] ?
HAPTER 5 Introduction to Backlight Design 8c m,G
C t6;Ln().Hw
1.Rotate and zoom the model to that you can see something like the illustration P!C!E/Jf5
below: &z-f, `yG
. 71+J{XOC
2.To reveal the Property Zones: R|T_9/#)
a.Right-click in the Design View and select View Preferences to display this %C=
{\]-2~
dialog box. jfyV9)
b.On the Visibility tab, click the Property Zone check box to turn it on. td@ F%*
c.Click OK. Y8I$J BO
You will see the wire frame rendering of the spherical bumps on the % Ke:%##Y
bottom surface, and a solid color above it. The solid color is the 3D texture @WX]K0 $;
of the BEFs (brightness-enhancing films) built automatically by the utility.
