The default number of bumps is 100 (10 X 10). You need to change these Iq&S6l <0
parameters to match your design. Note that LightTools allows many other !6:q#B*
placement options, but you will use the Bezier placement option for this 2Z]<MiAx D
example. u*R9x3&/5
5.On both the X Placement tab and Y Placement tab, change the Number of RZykwD(
Bumps parameter to 300, as shown in the following figure. Click Apply after ?H9F"B$a
each change. ag6hhkj A
6.Click OK to close the dialog box. ZB-+ bY
Note that the number of bumps is 300 X 300, which results in about 90,000 %SV"iXxY
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a g*9jPw dG
manner defined by the Bezier parameterization option. Please see Chapter 5 of Q C:/xP
the LightTools Core Module User’s Guide for more information. With the \Fh k>
current parameter values, the Bezier option varies the bump spacing along the "P:kZ= M
Q
length of the light guide. The spacing in the orthogonal direction is constant. /f!_dJ^
The X and Y refer to the local coordinate system of the surface. H!dUQ
LightTools Introductory Tutorial * 91 h3^ &,U
zdA:K25"
HAPTER 5 Introduction to Backlight Design V'h
O
C
b@ J&jE~d
Examining Surface Properties *b" ( r|Ko
Using the methods described in previous chapters, you may want to check your cK.T=7T
model before you run a simulation. Ty]/F+{
Click on various parts of the model in the 3D Design View. Or use the System SU, t,i
Navigator to select different surfaces and view their Properties. I>b-w;cC
1.In the System Navigator, click to open BottomSurface of the LightGuide, then )2X ng_,
click Zones, and then click Texture. "A jtNL5
2.Select SphericalElement, and then right-click and select Properties from the 7lpd$Y
shortcut menu. The Shape tab shows you a graphical representation of the }z&P^p)R
spherical bump shape that is the bottom of the light guide. s(7'*`G"h
You might be curious as to why you cannot see the 3D texture property zones you n3{m
"h3
defined. They are invisible by default, because drawing thousands of texture P=& J e?
elements can make displaying and exploring the model somewhat slow. If you (sw1 HR
choose to make them visible, 3D textures are displayed in wireframe, even if the "m]"%MU7 8
display mode is set to translucent. Wireframe rendering displays a bit faster and 6l#1E#]|
shows more of the technical details. @]f"X>
92 * LightTools Introductory Tutorial ]?F05!$ *
"r0z( j
HAPTER 5 Introduction to Backlight Design ~B%EvG7:n
C V|NWJ7
1.Rotate and zoom the model to that you can see something like the illustration 78tWzO
below: ZNPzQ:I@
. V"VWHAu*.w
2.To reveal the Property Zones: 9frx 60
a.Right-click in the Design View and select View Preferences to display this 0_bt*.w I+
dialog box. @18@[ :d"
b.On the Visibility tab, click the Property Zone check box to turn it on. dJ`Fvj
c.Click OK. x&R&\}@G m
You will see the wire frame rendering of the spherical bumps on the ]
K7>R0
bottom surface, and a solid color above it. The solid color is the 3D texture k>{i_`*
of the BEFs (brightness-enhancing films) built automatically by the utility.
