The default number of bumps is 100 (10 X 10). You need to change these }Z`@Z'
parameters to match your design. Note that LightTools allows many other ]o_E]5"jO
placement options, but you will use the Bezier placement option for this ; ~s@_}&
example. *1}vn%wvn
5.On both the X Placement tab and Y Placement tab, change the Number of Vb2")+*:
Bumps parameter to 300, as shown in the following figure. Click Apply after 6:\z8fY D
each change. W *D* \E
6.Click OK to close the dialog box. t*Wx voxk
Note that the number of bumps is 300 X 300, which results in about 90,000 ,-BZsZ0~
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a a[gN+DX%L
manner defined by the Bezier parameterization option. Please see Chapter 5 of OL[_2m*;9p
the LightTools Core Module User’s Guide for more information. With the 1 z[blNs&
current parameter values, the Bezier option varies the bump spacing along the >2)!w
length of the light guide. The spacing in the orthogonal direction is constant. I3?:KVa
The X and Y refer to the local coordinate system of the surface. s QT,@'"
LightTools Introductory Tutorial * 91 3*b!]^d:D
< YuI}d~'
HAPTER 5 Introduction to Backlight Design !Jo.Un7
C UmQ'=@^kR
Examining Surface Properties w T\dzp>/
Using the methods described in previous chapters, you may want to check your . LNqU#a
model before you run a simulation. q}5&B =2pM
Click on various parts of the model in the 3D Design View. Or use the System F~O! J@4]
Navigator to select different surfaces and view their Properties. *$>$O%
1.In the System Navigator, click to open BottomSurface of the LightGuide, then Y'%_--
click Zones, and then click Texture. 7h/{F({r=
2.Select SphericalElement, and then right-click and select Properties from the \'N|1!EO|t
shortcut menu. The Shape tab shows you a graphical representation of the GgjB Le=C
spherical bump shape that is the bottom of the light guide. gClDVO
You might be curious as to why you cannot see the 3D texture property zones you 8%9OB5?F6
defined. They are invisible by default, because drawing thousands of texture
4HDQj]z/
elements can make displaying and exploring the model somewhat slow. If you YuDNm}r[
choose to make them visible, 3D textures are displayed in wireframe, even if the uO-R:MC
display mode is set to translucent. Wireframe rendering displays a bit faster and L:EJ+bNG
shows more of the technical details. xE .=\UzJ
92 * LightTools Introductory Tutorial h-h}NCP
DSHpM/7
HAPTER 5 Introduction to Backlight Design /7 zy5
C s/'gl
1.Rotate and zoom the model to that you can see something like the illustration }c,}+{q
below: cjO,#W0&f
. g@" 6QA P
2.To reveal the Property Zones: VVje|T^{Z
a.Right-click in the Design View and select View Preferences to display this P6 G/J-
dialog box. -nT+!3A8
b.On the Visibility tab, click the Property Zone check box to turn it on. G8?<(.pi@
c.Click OK. Q-&]Vg
You will see the wire frame rendering of the spherical bumps on the `0Q:d'
bottom surface, and a solid color above it. The solid color is the 3D texture i&FC-{|Z
of the BEFs (brightness-enhancing films) built automatically by the utility.
