The default number of bumps is 100 (10 X 10). You need to change these ;sFF+^~L
parameters to match your design. Note that LightTools allows many other Nda *L|
placement options, but you will use the Bezier placement option for this $PHvA6D
example. k"w"hg&e
5.On both the X Placement tab and Y Placement tab, change the Number of iOO)Q\
Bumps parameter to 300, as shown in the following figure. Click Apply after 9'q*:&qq
each change. q> C'BIr
6.Click OK to close the dialog box. >[*qf9$
Note that the number of bumps is 300 X 300, which results in about 90,000 4+ Z]3oIRE
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a @f_+=}|dc
manner defined by the Bezier parameterization option. Please see Chapter 5 of /&94 e C
the LightTools Core Module User’s Guide for more information. With the 6) Lk-D
current parameter values, the Bezier option varies the bump spacing along the ; 4~hB
length of the light guide. The spacing in the orthogonal direction is constant. 1|wL\I
The X and Y refer to the local coordinate system of the surface. pz>>)c`
LightTools Introductory Tutorial * 91 ~&bq0 (
HyWCMK6b
HAPTER 5 Introduction to Backlight Design *;*r 8[U}q
C y'*K|a TG
Examining Surface Properties !C: $?o U
Using the methods described in previous chapters, you may want to check your 0lR5<^B
model before you run a simulation. c! 9nnTap
Click on various parts of the model in the 3D Design View. Or use the System [cp+ i^f
Navigator to select different surfaces and view their Properties. v_-d x
1.In the System Navigator, click to open BottomSurface of the LightGuide, then IO-Ow!
click Zones, and then click Texture. }`~+]9 <
2.Select SphericalElement, and then right-click and select Properties from the sON|w86B
shortcut menu. The Shape tab shows you a graphical representation of the d>C$+v>
spherical bump shape that is the bottom of the light guide. %bf Q$a:
You might be curious as to why you cannot see the 3D texture property zones you K(Bf2Mfq
defined. They are invisible by default, because drawing thousands of texture N ?"]
elements can make displaying and exploring the model somewhat slow. If you w+CA1q<
choose to make them visible, 3D textures are displayed in wireframe, even if the kW&TJP+5*
display mode is set to translucent. Wireframe rendering displays a bit faster and +; AZ+w]ZF
shows more of the technical details. TWF r
4-
92 * LightTools Introductory Tutorial Jg| XH
L)
,01"S WE
HAPTER 5 Introduction to Backlight Design 0 :Ol7
C ) hfpwdQ
1.Rotate and zoom the model to that you can see something like the illustration >\3V a
below: Zz T9j~
. p= } Nn(
2.To reveal the Property Zones: @ J`"[% U
a.Right-click in the Design View and select View Preferences to display this ,nDaqQ-C!!
dialog box. #4 pB@_
b.On the Visibility tab, click the Property Zone check box to turn it on. TbW38\>.R
c.Click OK. 81Z) eO#
You will see the wire frame rendering of the spherical bumps on the kpN)zxf k
bottom surface, and a solid color above it. The solid color is the 3D texture 7O-x<P;
of the BEFs (brightness-enhancing films) built automatically by the utility.
