The default number of bumps is 100 (10 X 10). You need to change these Y )9] I6n7
parameters to match your design. Note that LightTools allows many other bPo*L~xdk
placement options, but you will use the Bezier placement option for this tC'@yX
example. w\Bx =a>vc
5.On both the X Placement tab and Y Placement tab, change the Number of TF;}NQ
Bumps parameter to 300, as shown in the following figure. Click Apply after I, YP{H 4
each change. ]5hGSl2
6.Click OK to close the dialog box. XCku[?Ix
Note that the number of bumps is 300 X 300, which results in about 90,000 e!|T Tap
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a n^;Sh$ Os
manner defined by the Bezier parameterization option. Please see Chapter 5 of { -kV~p
the LightTools Core Module User’s Guide for more information. With the ]QK@zb}x
current parameter values, the Bezier option varies the bump spacing along the 1
Ll<^P
length of the light guide. The spacing in the orthogonal direction is constant. U{~R39
The X and Y refer to the local coordinate system of the surface. 09C[B+>h
LightTools Introductory Tutorial * 91 DeL7sU
S!wY6z
HAPTER 5 Introduction to Backlight Design *kWr F* )J
C 4e 5 5
Examining Surface Properties hu''"/raM
Using the methods described in previous chapters, you may want to check your C`>|D [
model before you run a simulation. vW:XM0
Click on various parts of the model in the 3D Design View. Or use the System {Tym#
Navigator to select different surfaces and view their Properties. =a3qpPkx
1.In the System Navigator, click to open BottomSurface of the LightGuide, then ~}F$1;t0
click Zones, and then click Texture. _'47yq^O
2.Select SphericalElement, and then right-click and select Properties from the #.z`clK#
shortcut menu. The Shape tab shows you a graphical representation of the y:N>t+'5
spherical bump shape that is the bottom of the light guide. }^Kye23
You might be curious as to why you cannot see the 3D texture property zones you |XdkJv]
defined. They are invisible by default, because drawing thousands of texture #{u>
elements can make displaying and exploring the model somewhat slow. If you rlIDym9nY~
choose to make them visible, 3D textures are displayed in wireframe, even if the <xWBS/K
display mode is set to translucent. Wireframe rendering displays a bit faster and ^6[o$eY3
shows more of the technical details. -H;p +XAY
92 * LightTools Introductory Tutorial $ VLCD
r]+N(&q
HAPTER 5 Introduction to Backlight Design GMO|A.bzzN
C :~ 1p
1.Rotate and zoom the model to that you can see something like the illustration y
2v69nu~q
below: ( e$/@3*
. eTp}*'$p
2.To reveal the Property Zones: M&5;Qeoiv
a.Right-click in the Design View and select View Preferences to display this BXf.^s{H
dialog box. Ie%twc
b.On the Visibility tab, click the Property Zone check box to turn it on. Lp ?JSMe
c.Click OK. "|:I]ZB
You will see the wire frame rendering of the spherical bumps on the
0^PI&7A?y
bottom surface, and a solid color above it. The solid color is the 3D texture 47c` ) *Hc
of the BEFs (brightness-enhancing films) built automatically by the utility.
