The default number of bumps is 100 (10 X 10). You need to change these T7T!v
parameters to match your design. Note that LightTools allows many other (g)@wNBW
placement options, but you will use the Bezier placement option for this ]EcZ|c7o9y
example. LAKZAi%O0
5.On both the X Placement tab and Y Placement tab, change the Number of 6m"
75
Bumps parameter to 300, as shown in the following figure. Click Apply after '-S&i{H
each change. M"vcF5q
6.Click OK to close the dialog box. I>3]4mI*a
Note that the number of bumps is 300 X 300, which results in about 90,000 1;xw)65
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a ]dK]a:S
manner defined by the Bezier parameterization option. Please see Chapter 5 of aK&+p#4t
the LightTools Core Module User’s Guide for more information. With the B0
I?
current parameter values, the Bezier option varies the bump spacing along the ]~.J@ 1?
length of the light guide. The spacing in the orthogonal direction is constant. ZYt
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The X and Y refer to the local coordinate system of the surface. iy#OmI>j
LightTools Introductory Tutorial * 91 {l11WiqQH
/T(\}Z
HAPTER 5 Introduction to Backlight Design 1b7xw#gLx
C !bcbzg2d&
Examining Surface Properties 5Hm!5:ZB
Using the methods described in previous chapters, you may want to check your D+)=bPMe
model before you run a simulation. i-FUAR
Click on various parts of the model in the 3D Design View. Or use the System iXm||?Rnx
Navigator to select different surfaces and view their Properties. !TOi ]`vqc
1.In the System Navigator, click to open BottomSurface of the LightGuide, then cO RM R!
click Zones, and then click Texture. H/3Zdj 9
2.Select SphericalElement, and then right-click and select Properties from the 4 ufLP DH
shortcut menu. The Shape tab shows you a graphical representation of the 8$v7|S6 z
spherical bump shape that is the bottom of the light guide. z ^/ GTY
You might be curious as to why you cannot see the 3D texture property zones you tv OAN|+F
defined. They are invisible by default, because drawing thousands of texture w~U`+2a3
elements can make displaying and exploring the model somewhat slow. If you Inc:t_
choose to make them visible, 3D textures are displayed in wireframe, even if the v|I5Gz$qpa
display mode is set to translucent. Wireframe rendering displays a bit faster and cX Y'>N
shows more of the technical details. MH.,s@
92 * LightTools Introductory Tutorial :2pBv#\"qk
{?mQqoZ?.
HAPTER 5 Introduction to Backlight Design Kyp0SZp[
C oe |e+
1.Rotate and zoom the model to that you can see something like the illustration GeaDaYh#T
below:
;Z q~w
. -z0{\=@#m
2.To reveal the Property Zones: n6-Ic',;
a.Right-click in the Design View and select View Preferences to display this '
f$L
dialog box. "x;k'{S
b.On the Visibility tab, click the Property Zone check box to turn it on. +w.Kv
;
c.Click OK. 3> #mO}\
You will see the wire frame rendering of the spherical bumps on the tt ]V$V
bottom surface, and a solid color above it. The solid color is the 3D texture ARdGh_yJ&
of the BEFs (brightness-enhancing films) built automatically by the utility.
