The default number of bumps is 100 (10 X 10). You need to change these h`rjD d
parameters to match your design. Note that LightTools allows many other "Un SZ[;t
placement options, but you will use the Bezier placement option for this <+,0 G`
example. je3n'^m
5.On both the X Placement tab and Y Placement tab, change the Number of gH) B`
@
Bumps parameter to 300, as shown in the following figure. Click Apply after 3CPO ZZ
each change. nJH% pBc
6.Click OK to close the dialog box. [E1|jcmQ
Note that the number of bumps is 300 X 300, which results in about 90,000 &U)s%D8e;d
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a c} ET#2,
manner defined by the Bezier parameterization option. Please see Chapter 5 of n< &R"89
the LightTools Core Module User’s Guide for more information. With the ?yeC
j1X
current parameter values, the Bezier option varies the bump spacing along the ;iNx@tz4
length of the light guide. The spacing in the orthogonal direction is constant. |L{dQ)-'l
The X and Y refer to the local coordinate system of the surface. o xu9v/
LightTools Introductory Tutorial * 91 u3b rb'Y+
7]zZh a4X
HAPTER 5 Introduction to Backlight Design >F_Ne)}qTQ
C DC7}Xly(
Examining Surface Properties lD#1"$Coz
Using the methods described in previous chapters, you may want to check your yP]W\W'
model before you run a simulation. ',7Z1O
Click on various parts of the model in the 3D Design View. Or use the System tSa%ZkS
Navigator to select different surfaces and view their Properties. t3JPxg]0k'
1.In the System Navigator, click to open BottomSurface of the LightGuide, then =:8=5tj
click Zones, and then click Texture. } AYSQ~:
2.Select SphericalElement, and then right-click and select Properties from the M= _CqK*
shortcut menu. The Shape tab shows you a graphical representation of the f(o`=% k8
spherical bump shape that is the bottom of the light guide. K): sq{
You might be curious as to why you cannot see the 3D texture property zones you =JH,RQ
*
defined. They are invisible by default, because drawing thousands of texture ^:ngHue8~
elements can make displaying and exploring the model somewhat slow. If you c &(,
choose to make them visible, 3D textures are displayed in wireframe, even if the ~kT{O!x}4
display mode is set to translucent. Wireframe rendering displays a bit faster and )/N! {`.9
shows more of the technical details. :] hfmWC
92 * LightTools Introductory Tutorial %y+j~]^:
8}T3Fig,q
HAPTER 5 Introduction to Backlight Design 7gaC)j&
C f L?~1i =
1.Rotate and zoom the model to that you can see something like the illustration {z_pL^S'52
below: jzMGRN/67
. _>64XUZ<n
2.To reveal the Property Zones: wuQkeWxJ
a.Right-click in the Design View and select View Preferences to display this sH: &OaA
dialog box. ka %p S
b.On the Visibility tab, click the Property Zone check box to turn it on. "ZW* O{
c.Click OK. n(VM GCZPV
You will see the wire frame rendering of the spherical bumps on the Ix R: a(
bottom surface, and a solid color above it. The solid color is the 3D texture E #p6A5
of the BEFs (brightness-enhancing films) built automatically by the utility.
