The default number of bumps is 100 (10 X 10). You need to change these <FU1|
parameters to match your design. Note that LightTools allows many other sKGR28e
placement options, but you will use the Bezier placement option for this $or8z2d1
example. ;Qdw$NuW
5.On both the X Placement tab and Y Placement tab, change the Number of S1d{! ` 3
Bumps parameter to 300, as shown in the following figure. Click Apply after k k7M$)>d
each change. 6^hCW`jG
6.Click OK to close the dialog box. Q`(.Blgm;
Note that the number of bumps is 300 X 300, which results in about 90,000 oD7^9=#
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a t,R4q*
manner defined by the Bezier parameterization option. Please see Chapter 5 of ynG@/S6)K
the LightTools Core Module User’s Guide for more information. With the OA8 iTn
current parameter values, the Bezier option varies the bump spacing along the ($^=f }+
length of the light guide. The spacing in the orthogonal direction is constant. pwr]lV$w
The X and Y refer to the local coordinate system of the surface. Xe:e./@
LightTools Introductory Tutorial * 91 R\n*O@E
v3
9i/VvW
HAPTER 5 Introduction to Backlight Design >iFi~)i_4y
C =&v&qn e9
Examining Surface Properties -!pg1w06
Using the methods described in previous chapters, you may want to check your jmh$6 N%
F
model before you run a simulation. 6Bn%7ZBv
Click on various parts of the model in the 3D Design View. Or use the System kU[#.
y=%p
Navigator to select different surfaces and view their Properties. J={IGA
1.In the System Navigator, click to open BottomSurface of the LightGuide, then ,L9ioYbp
click Zones, and then click Texture. ~ YCZvJ
2.Select SphericalElement, and then right-click and select Properties from the >r5s>A[YC
shortcut menu. The Shape tab shows you a graphical representation of the }C9 P--
spherical bump shape that is the bottom of the light guide. iP+3)
You might be curious as to why you cannot see the 3D texture property zones you ;\)N7SJ
defined. They are invisible by default, because drawing thousands of texture W)m\q}]FYz
elements can make displaying and exploring the model somewhat slow. If you Qwu~ {tf+'
choose to make them visible, 3D textures are displayed in wireframe, even if the `{W>Dy
display mode is set to translucent. Wireframe rendering displays a bit faster and b f-V Q7
shows more of the technical details. 56^#x
92 * LightTools Introductory Tutorial |Gn qfD
.3< sv
HAPTER 5 Introduction to Backlight Design o k<!/"RX$
C !O*uQB
1.Rotate and zoom the model to that you can see something like the illustration /;a b"b
below: \N"=qw^ t
. B0eKj=y;
2.To reveal the Property Zones: ~xV|<;
a.Right-click in the Design View and select View Preferences to display this *HXx;:
dialog box. {/ PiX1mn
b.On the Visibility tab, click the Property Zone check box to turn it on. i4^1bd
c.Click OK. !_#2$J*s^D
You will see the wire frame rendering of the spherical bumps on the \S`|7JYW
bottom surface, and a solid color above it. The solid color is the 3D texture kMY1Xb
of the BEFs (brightness-enhancing films) built automatically by the utility.
