The default number of bumps is 100 (10 X 10). You need to change these \nJrjHA
parameters to match your design. Note that LightTools allows many other 'UB<;6wy
placement options, but you will use the Bezier placement option for this j{HxX
example. `$i`i 'S
5.On both the X Placement tab and Y Placement tab, change the Number of fer'2(G?W
Bumps parameter to 300, as shown in the following figure. Click Apply after 9LFg":
each change. J#D!J8KP7
6.Click OK to close the dialog box. L*5&hPU
Note that the number of bumps is 300 X 300, which results in about 90,000 tf/ f-S
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a Q!"Li
manner defined by the Bezier parameterization option. Please see Chapter 5 of L7KHs'c*
the LightTools Core Module User’s Guide for more information. With the bc&:v$EGy
current parameter values, the Bezier option varies the bump spacing along the kL&^/([9
length of the light guide. The spacing in the orthogonal direction is constant. $;@s
The X and Y refer to the local coordinate system of the surface. :hevBBP
LightTools Introductory Tutorial * 91 MTF:mLJ
J>+Dv?Ni$
HAPTER 5 Introduction to Backlight Design P#yS]F/
C eag$i.^aS
Examining Surface Properties Z|7Y1W[
Using the methods described in previous chapters, you may want to check your YY.;J3C
model before you run a simulation.
\n`]QN
Click on various parts of the model in the 3D Design View. Or use the System O<+C$J|
Navigator to select different surfaces and view their Properties. VRxBi!d
1.In the System Navigator, click to open BottomSurface of the LightGuide, then C ]#R7G
click Zones, and then click Texture. H8\N~>
2.Select SphericalElement, and then right-click and select Properties from the Xu'u"amt
shortcut menu. The Shape tab shows you a graphical representation of the NfN#q:w1
spherical bump shape that is the bottom of the light guide. B4{A(-Tc
You might be curious as to why you cannot see the 3D texture property zones you Ck[Z(=b$$:
defined. They are invisible by default, because drawing thousands of texture xi.;`Q^#
elements can make displaying and exploring the model somewhat slow. If you !|`YNsR
choose to make them visible, 3D textures are displayed in wireframe, even if the E-Mp|y /V
display mode is set to translucent. Wireframe rendering displays a bit faster and +ivz
shows more of the technical details. >#V8l@IH
92 * LightTools Introductory Tutorial 7tyn?t0n
Gd'^vqo<
HAPTER 5 Introduction to Backlight Design (K2 p3M^
C sd=i!r)ya
1.Rotate and zoom the model to that you can see something like the illustration Pajr`gU
below: 1ltoLd\{
. ;/YSQt)rc>
2.To reveal the Property Zones: HFf|
>&c&
a.Right-click in the Design View and select View Preferences to display this UL{Xe&sT
dialog box. xXyzzr1[
b.On the Visibility tab, click the Property Zone check box to turn it on. 7g=Ze~aq
c.Click OK. M"P$hb'F
You will see the wire frame rendering of the spherical bumps on the a1GyI
bottom surface, and a solid color above it. The solid color is the 3D texture Xe%n.DW m
of the BEFs (brightness-enhancing films) built automatically by the utility.