The default number of bumps is 100 (10 X 10). You need to change these NX(IX6^y
parameters to match your design. Note that LightTools allows many other 7Dl^5q.|
placement options, but you will use the Bezier placement option for this 7b-[# g
example. R\n@q_!`X
5.On both the X Placement tab and Y Placement tab, change the Number of < _pLmYI
Bumps parameter to 300, as shown in the following figure. Click Apply after >YXb"g@.
each change. ow
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6.Click OK to close the dialog box. z;@<J8I
Note that the number of bumps is 300 X 300, which results in about 90,000 `FNU-
I4s
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a yB *aG
manner defined by the Bezier parameterization option. Please see Chapter 5 of pX3E l$p
the LightTools Core Module User’s Guide for more information. With the ,K6ODtw.
current parameter values, the Bezier option varies the bump spacing along the Zn. S65J*u
length of the light guide. The spacing in the orthogonal direction is constant. NcwUK \
The X and Y refer to the local coordinate system of the surface. s2QgR37s>
LightTools Introductory Tutorial * 91 pp*MHM)x|q
Yz0HB EA
HAPTER 5 Introduction to Backlight Design 1 YtY=
C I
Gb'ii=A
Examining Surface Properties y |*4XF<b
Using the methods described in previous chapters, you may want to check your Fd 80T6[
model before you run a simulation. @W(,|xES
Click on various parts of the model in the 3D Design View. Or use the System ,g?M[(wtc
Navigator to select different surfaces and view their Properties. `Has3AX8
1.In the System Navigator, click to open BottomSurface of the LightGuide, then HlkjyD8
click Zones, and then click Texture. RiZ}cd
2.Select SphericalElement, and then right-click and select Properties from the X%iqve"{nB
shortcut menu. The Shape tab shows you a graphical representation of the Gb Mu;CA
spherical bump shape that is the bottom of the light guide. XM?c*,=fu
You might be curious as to why you cannot see the 3D texture property zones you em^2\*sxpA
defined. They are invisible by default, because drawing thousands of texture s%> u[-9U
elements can make displaying and exploring the model somewhat slow. If you U'5p;j)_
choose to make them visible, 3D textures are displayed in wireframe, even if the .g}Y!
l
display mode is set to translucent. Wireframe rendering displays a bit faster and [tt_>O
shows more of the technical details. DX3jE p2
92 * LightTools Introductory Tutorial MfLus40;n
R~ TG5^(
HAPTER 5 Introduction to Backlight Design rvn m*e,
C M5`m5qc3
1.Rotate and zoom the model to that you can see something like the illustration _ J"J [$
below: QiRx2Z*\
. }gX4dv
B
2.To reveal the Property Zones: Xe/7rhov
a.Right-click in the Design View and select View Preferences to display this c No)LF
dialog box. {Y]3t9 !\
b.On the Visibility tab, click the Property Zone check box to turn it on. #&{)`+!"
c.Click OK. +`m0i1uI3
You will see the wire frame rendering of the spherical bumps on the
zn* i
bottom surface, and a solid color above it. The solid color is the 3D texture ;lTgihW-
of the BEFs (brightness-enhancing films) built automatically by the utility.
