The default number of bumps is 100 (10 X 10). You need to change these =CW> ;h]
parameters to match your design. Note that LightTools allows many other L]%!YP\<T
placement options, but you will use the Bezier placement option for this A i"MJ6)
example. ;.Ld6JRunw
5.On both the X Placement tab and Y Placement tab, change the Number of tLU@&NY `
Bumps parameter to 300, as shown in the following figure. Click Apply after Eyz. ^)r
each change. ff7#LeB9
6.Click OK to close the dialog box. TNckyP75u
Note that the number of bumps is 300 X 300, which results in about 90,000 gnkeJ}K
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a { P,hH~!
manner defined by the Bezier parameterization option. Please see Chapter 5 of F!ph Tu
the LightTools Core Module User’s Guide for more information. With the "TP~TjXf q
current parameter values, the Bezier option varies the bump spacing along the bIlNA )g
length of the light guide. The spacing in the orthogonal direction is constant. p>i8aN
The X and Y refer to the local coordinate system of the surface. pN)x,<M)
LightTools Introductory Tutorial * 91 d&AO 4^
T`MM<+^G
HAPTER 5 Introduction to Backlight Design
F3K<-JK+
C #jzF6j%G
Examining Surface Properties Q@W!6]*\
Using the methods described in previous chapters, you may want to check your KxD/{0F
model before you run a simulation. cIQbu#[@
Click on various parts of the model in the 3D Design View. Or use the System yMu G? x+
Navigator to select different surfaces and view their Properties. x[$KZGK+GL
1.In the System Navigator, click to open BottomSurface of the LightGuide, then eXD~L &s[
click Zones, and then click Texture. ]l C2YD}
2.Select SphericalElement, and then right-click and select Properties from the 7M
_
mR Vh
shortcut menu. The Shape tab shows you a graphical representation of the .zl[nx[9"D
spherical bump shape that is the bottom of the light guide. nW*cqM%+
You might be curious as to why you cannot see the 3D texture property zones you *N4/ M%1P
defined. They are invisible by default, because drawing thousands of texture tcnO`0moK
elements can make displaying and exploring the model somewhat slow. If you &ds+9A
choose to make them visible, 3D textures are displayed in wireframe, even if the H2H[ DVKv
display mode is set to translucent. Wireframe rendering displays a bit faster and 10h; N[
shows more of the technical details. !*L)v
92 * LightTools Introductory Tutorial k e!
G3`9'-2q@c
HAPTER 5 Introduction to Backlight Design x/CM)!U)
C W!R0: -
1.Rotate and zoom the model to that you can see something like the illustration 5jso)`IL
below: 3! \h'5{
. c-5AI{%bl6
2.To reveal the Property Zones: z?Ok'LX
a.Right-click in the Design View and select View Preferences to display this [|YvVA
dialog box. M]p-<R\
b.On the Visibility tab, click the Property Zone check box to turn it on. PVH Or^
c.Click OK. [OTn>/W'
You will see the wire frame rendering of the spherical bumps on the {aq)Y>o5:T
bottom surface, and a solid color above it. The solid color is the 3D texture ]M l
of the BEFs (brightness-enhancing films) built automatically by the utility.
