The default number of bumps is 100 (10 X 10). You need to change these KV(Q;~8"X
parameters to match your design. Note that LightTools allows many other vSEuk}pk
placement options, but you will use the Bezier placement option for this ?l9XAW t\
example. ;U-j O &
5.On both the X Placement tab and Y Placement tab, change the Number of <0X f9a8>
Bumps parameter to 300, as shown in the following figure. Click Apply after 5 > [u `
each change. 1q7|OWFT
6.Click OK to close the dialog box. Zy`m!]G]80
Note that the number of bumps is 300 X 300, which results in about 90,000 LY%WD%pL
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a 9Z4nA c
manner defined by the Bezier parameterization option. Please see Chapter 5 of 8Vr%n2M
the LightTools Core Module User’s Guide for more information. With the 6 (]Dh;gC
current parameter values, the Bezier option varies the bump spacing along the A^USBv+9`
length of the light guide. The spacing in the orthogonal direction is constant. `sn^ysp
The X and Y refer to the local coordinate system of the surface. '=b/6@&
LightTools Introductory Tutorial * 91 5IE#\FITO|
Ayxkv)%:@)
HAPTER 5 Introduction to Backlight Design *\
R ]NV
C p M4 :#%V
Examining Surface Properties =;Au<|
Using the methods described in previous chapters, you may want to check your |-:()yxs
model before you run a simulation. k\5c|Wq|g
Click on various parts of the model in the 3D Design View. Or use the System z&zP)>Pv
Navigator to select different surfaces and view their Properties. ,E S0NA
1.In the System Navigator, click to open BottomSurface of the LightGuide, then -t!~%_WCv
click Zones, and then click Texture. <:+ x+4ru
2.Select SphericalElement, and then right-click and select Properties from the *4\:8
shortcut menu. The Shape tab shows you a graphical representation of the s6 uG`F"
spherical bump shape that is the bottom of the light guide. LBYMCY
You might be curious as to why you cannot see the 3D texture property zones you +r2+X:#~T
defined. They are invisible by default, because drawing thousands of texture :CG`t?N9M
elements can make displaying and exploring the model somewhat slow. If you +$ 'Zf0 U
choose to make them visible, 3D textures are displayed in wireframe, even if the hOjk3
k
display mode is set to translucent. Wireframe rendering displays a bit faster and oB(?_No7
shows more of the technical details. u^^[Q2LDU}
92 * LightTools Introductory Tutorial "L IF.)
=^M/{51j
HAPTER 5 Introduction to Backlight Design XP!S$Q]D
C /:m->
T
1.Rotate and zoom the model to that you can see something like the illustration , qMzW a
below: &6/[B_.
. Cio
1E-4
2.To reveal the Property Zones: V5+=e^pa2
a.Right-click in the Design View and select View Preferences to display this D+ l AhEN
dialog box. UXJ eAE-
b.On the Visibility tab, click the Property Zone check box to turn it on. jys :5P
c.Click OK. {'7B6
You will see the wire frame rendering of the spherical bumps on the kMIcK4.MH
bottom surface, and a solid color above it. The solid color is the 3D texture ,0 M_ Bk"
of the BEFs (brightness-enhancing films) built automatically by the utility.
