The default number of bumps is 100 (10 X 10). You need to change these :k \#=u(
parameters to match your design. Note that LightTools allows many other z~Q=OPCnY
placement options, but you will use the Bezier placement option for this oU|G74e 6
example. W>#yXg9
5.On both the X Placement tab and Y Placement tab, change the Number of exq5Z c%
Bumps parameter to 300, as shown in the following figure. Click Apply after &tH?m;V
each change. nI6 gd%C
6.Click OK to close the dialog box. =~
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Note that the number of bumps is 300 X 300, which results in about 90,000 ~,/@]6S&Y
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a VcKB:(:[
manner defined by the Bezier parameterization option. Please see Chapter 5 of }{R*pmv$bN
the LightTools Core Module User’s Guide for more information. With the '=0}2sF>
current parameter values, the Bezier option varies the bump spacing along the l cl|o3yQ
length of the light guide. The spacing in the orthogonal direction is constant. v+LJx
The X and Y refer to the local coordinate system of the surface.
GK/Po51
LightTools Introductory Tutorial * 91 H,} &=SCk
JpS}X\]i
HAPTER 5 Introduction to Backlight Design M
v6 ^('
C 2 .3_ FXSt
Examining Surface Properties %:aXEjm@
Using the methods described in previous chapters, you may want to check your ^ ;EhKG
model before you run a simulation. Ef] Hpjvp
Click on various parts of the model in the 3D Design View. Or use the System mG
S4W;
Navigator to select different surfaces and view their Properties. 2 GRI<M
1.In the System Navigator, click to open BottomSurface of the LightGuide, then @HS*%N"*
click Zones, and then click Texture. Uxjc&o
2.Select SphericalElement, and then right-click and select Properties from the x3ZF6)@
shortcut menu. The Shape tab shows you a graphical representation of the ]s=|+tz\V
spherical bump shape that is the bottom of the light guide. 6:5K?Yo
You might be curious as to why you cannot see the 3D texture property zones you m?kiGC&m
defined. They are invisible by default, because drawing thousands of texture 4]r_K2.cc
elements can make displaying and exploring the model somewhat slow. If you -'Z Gc8)
choose to make them visible, 3D textures are displayed in wireframe, even if the X%b1KG|#(
display mode is set to translucent. Wireframe rendering displays a bit faster and O | H:
shows more of the technical details. wqo:gW_
92 * LightTools Introductory Tutorial ) lUS' I
V|u2(*
HAPTER 5 Introduction to Backlight Design .?{n o}u.
C V}V->j*
1.Rotate and zoom the model to that you can see something like the illustration t^'nh
1=
below: *?<N3Rr*
. ,)`_?^ \$f
2.To reveal the Property Zones: k ]NZ%.
a.Right-click in the Design View and select View Preferences to display this \\S QACN
dialog box. e \Qys<2r
b.On the Visibility tab, click the Property Zone check box to turn it on. DZ|*hQU>K
c.Click OK. m[}P
You will see the wire frame rendering of the spherical bumps on the akv i^]x
bottom surface, and a solid color above it. The solid color is the 3D texture pyhXET
'
of the BEFs (brightness-enhancing films) built automatically by the utility.
