The default number of bumps is 100 (10 X 10). You need to change these vakAl;
parameters to match your design. Note that LightTools allows many other 7g}lg8M
placement options, but you will use the Bezier placement option for this RGw=!0V
example. GvL)SVv?
5.On both the X Placement tab and Y Placement tab, change the Number of \BV$p2m5-
Bumps parameter to 300, as shown in the following figure. Click Apply after FJ| 6R(T_
each change. z"b}V01F#
6.Click OK to close the dialog box. S}/?L m}
Note that the number of bumps is 300 X 300, which results in about 90,000 Ye'=F
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a oJcDs-!
manner defined by the Bezier parameterization option. Please see Chapter 5 of L8&$o2+07r
the LightTools Core Module User’s Guide for more information. With the rNgFsFQ>.
current parameter values, the Bezier option varies the bump spacing along the [Ch)6p
length of the light guide. The spacing in the orthogonal direction is constant. 'w?*4H
The X and Y refer to the local coordinate system of the surface. $c !cO" U
LightTools Introductory Tutorial * 91 @A_bZQ@
_&Hq` KJm
HAPTER 5 Introduction to Backlight Design %>dCAj"
C X}~5%B(
Examining Surface Properties Z'P>sV
Using the methods described in previous chapters, you may want to check your DS@ZE Q`F
model before you run a simulation. ZeUA e
Click on various parts of the model in the 3D Design View. Or use the System 7IrbwAGZ3
Navigator to select different surfaces and view their Properties. /B $9B
1.In the System Navigator, click to open BottomSurface of the LightGuide, then K0|8h!WF+
click Zones, and then click Texture. #}/YnVk
2.Select SphericalElement, and then right-click and select Properties from the Xndgs}zz
shortcut menu. The Shape tab shows you a graphical representation of the 4,8=0[eRG
spherical bump shape that is the bottom of the light guide. r[
UZHX5+S
You might be curious as to why you cannot see the 3D texture property zones you (vq0Gl
defined. They are invisible by default, because drawing thousands of texture qUH02" z@9
elements can make displaying and exploring the model somewhat slow. If you +1Qa7 \
choose to make them visible, 3D textures are displayed in wireframe, even if the wUGSM"~
|
display mode is set to translucent. Wireframe rendering displays a bit faster and WOW:$.VO^
shows more of the technical details. tOJK~%'
92 * LightTools Introductory Tutorial ,t`u3ykh
39xAh*}G]
HAPTER 5 Introduction to Backlight Design Z /#&c
C Vv"JN?dHi
1.Rotate and zoom the model to that you can see something like the illustration |i)7j G<
below: d|^cKLu
. 82S?@%}# J
2.To reveal the Property Zones: DrfOz#a0Uu
a.Right-click in the Design View and select View Preferences to display this C+, JLK
dialog box. ^sLnKAN
b.On the Visibility tab, click the Property Zone check box to turn it on. o"^+i#H!
c.Click OK. zYCrfr
You will see the wire frame rendering of the spherical bumps on the }ze,6T*z
bottom surface, and a solid color above it. The solid color is the 3D texture %?GLMf 7)
of the BEFs (brightness-enhancing films) built automatically by the utility.
