The default number of bumps is 100 (10 X 10). You need to change these J<lW<:!3]
parameters to match your design. Note that LightTools allows many other M"L=L5OH-
placement options, but you will use the Bezier placement option for this !5!<C,U
example. |Y.?_lC
5.On both the X Placement tab and Y Placement tab, change the Number of ;hq\
Bumps parameter to 300, as shown in the following figure. Click Apply after );YDtGip J
each change. :Hbv)tS\3w
6.Click OK to close the dialog box. yB!dp;gM{
Note that the number of bumps is 300 X 300, which results in about 90,000 |w3M7;~eF
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a t6t! t* jO
manner defined by the Bezier parameterization option. Please see Chapter 5 of N2o7%gJw
the LightTools Core Module User’s Guide for more information. With the noj0F::m`j
current parameter values, the Bezier option varies the bump spacing along the nJ;.Td
length of the light guide. The spacing in the orthogonal direction is constant. izR"+v
The X and Y refer to the local coordinate system of the surface. x?<FJ"8"k
LightTools Introductory Tutorial * 91 8 zb /xP>
|uJ%5y#
HAPTER 5 Introduction to Backlight Design ~V6D <
C "J1
4C9u
Examining Surface Properties 1\.pMHv/
Using the methods described in previous chapters, you may want to check your w32y3~
model before you run a simulation. J[kTlHMD
Click on various parts of the model in the 3D Design View. Or use the System 0*v2y*2V
Navigator to select different surfaces and view their Properties. -:rUw$3J
1.In the System Navigator, click to open BottomSurface of the LightGuide, then \{D"
!e
click Zones, and then click Texture. zT { VE+=
2.Select SphericalElement, and then right-click and select Properties from the !5N.B|N t
shortcut menu. The Shape tab shows you a graphical representation of the )U# K
spherical bump shape that is the bottom of the light guide. s#GLJl\E_P
You might be curious as to why you cannot see the 3D texture property zones you l+b~KU7~l
defined. They are invisible by default, because drawing thousands of texture {4PwL Cy
elements can make displaying and exploring the model somewhat slow. If you r mOj
choose to make them visible, 3D textures are displayed in wireframe, even if the 1 -b_~DF
display mode is set to translucent. Wireframe rendering displays a bit faster and `GLx#=Q
shows more of the technical details. eJX#@`K
92 * LightTools Introductory Tutorial SS 2%q v
@}Z Vtrz
HAPTER 5 Introduction to Backlight Design '<uq3?5
C y )<q /
1.Rotate and zoom the model to that you can see something like the illustration R|Q?KCI&
below: phz&zl D
. `H+ lPM66
2.To reveal the Property Zones: & nK<:^n
a.Right-click in the Design View and select View Preferences to display this P2nu;I_ &
dialog box. 2Z%O7V~u
b.On the Visibility tab, click the Property Zone check box to turn it on. S|}L &A
c.Click OK. d"Y{UE
You will see the wire frame rendering of the spherical bumps on the c*M} N?|6
bottom surface, and a solid color above it. The solid color is the 3D texture Bbp|!+KP{(
of the BEFs (brightness-enhancing films) built automatically by the utility.
