The default number of bumps is 100 (10 X 10). You need to change these ZFY t[:
parameters to match your design. Note that LightTools allows many other : 6./yj(
placement options, but you will use the Bezier placement option for this H~e;S#3_v
example. Ft#d &
I
5.On both the X Placement tab and Y Placement tab, change the Number of 8$BZbj%?hx
Bumps parameter to 300, as shown in the following figure. Click Apply after 98x]x:mgI_
each change. N{ @B@]
6.Click OK to close the dialog box. '/J}T -,Z
Note that the number of bumps is 300 X 300, which results in about 90,000 DI"mi1ObE
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a 1nye.i~
manner defined by the Bezier parameterization option. Please see Chapter 5 of _ p<s!
the LightTools Core Module User’s Guide for more information. With the ,GA2K .:#
current parameter values, the Bezier option varies the bump spacing along the X~T"n<:a>
length of the light guide. The spacing in the orthogonal direction is constant. F$N"&<[ c
The X and Y refer to the local coordinate system of the surface. |Qo;=~7
LightTools Introductory Tutorial * 91 m\)z& hv<r
.'saUcVg:
HAPTER 5 Introduction to Backlight Design CfNHv-jDL
C d;daYjOm
Examining Surface Properties TL U^ad#9E
Using the methods described in previous chapters, you may want to check your k,LeBCqGcb
model before you run a simulation. K1AI:$H
Click on various parts of the model in the 3D Design View. Or use the System %+y nrg-
Navigator to select different surfaces and view their Properties. s+8
v7ZJ
1.In the System Navigator, click to open BottomSurface of the LightGuide, then prV:Kq ;O
click Zones, and then click Texture. D BI[OG9
2.Select SphericalElement, and then right-click and select Properties from the " qY Pi
shortcut menu. The Shape tab shows you a graphical representation of the VPx"l5\
spherical bump shape that is the bottom of the light guide. _=Ed>2M)no
You might be curious as to why you cannot see the 3D texture property zones you : " 9F.U
defined. They are invisible by default, because drawing thousands of texture : n 4?
elements can make displaying and exploring the model somewhat slow. If you 6hv4D`d ;o
choose to make them visible, 3D textures are displayed in wireframe, even if the uW3`gwwlU
display mode is set to translucent. Wireframe rendering displays a bit faster and @kw#\%Uz
shows more of the technical details. gNY}`'~hr
92 * LightTools Introductory Tutorial &`[y] E'
] ([:"j
HAPTER 5 Introduction to Backlight Design 2"* 7H S
C po~V{>fUm
1.Rotate and zoom the model to that you can see something like the illustration I0trHrX9
below: -
|n\
. -'*\KA@u
2.To reveal the Property Zones: 5- 3`@ (/
a.Right-click in the Design View and select View Preferences to display this mojD
dialog box. `OO=^.-u
b.On the Visibility tab, click the Property Zone check box to turn it on. _-$O6eZ
c.Click OK. pCS2sq8RC
You will see the wire frame rendering of the spherical bumps on the ;$gZ ?&
bottom surface, and a solid color above it. The solid color is the 3D texture i>#[*.|P
of the BEFs (brightness-enhancing films) built automatically by the utility.
