The default number of bumps is 100 (10 X 10). You need to change these JZzf,G:
parameters to match your design. Note that LightTools allows many other 29^bMau)v
placement options, but you will use the Bezier placement option for this 6sl<Z=E#
example. 6 W;k IoB
5.On both the X Placement tab and Y Placement tab, change the Number of y Xx62J
Bumps parameter to 300, as shown in the following figure. Click Apply after zDyeAxh4
each change. 0
0&$SE
6.Click OK to close the dialog box. |:+pPh!-
Note that the number of bumps is 300 X 300, which results in about 90,000 o$VH,2 QF
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a 3gy;$}Lq T
manner defined by the Bezier parameterization option. Please see Chapter 5 of *^ 6xt7
the LightTools Core Module User’s Guide for more information. With the +c`C9RXk
current parameter values, the Bezier option varies the bump spacing along the IGT_
5te
length of the light guide. The spacing in the orthogonal direction is constant. [!? ,TGM}^
The X and Y refer to the local coordinate system of the surface. [9om"'
LightTools Introductory Tutorial * 91 ZHlin#"
Z(mn
U;9{v
HAPTER 5 Introduction to Backlight Design N>%KV8>{L
C sDm},=X}
Examining Surface Properties Xh AcC
Using the methods described in previous chapters, you may want to check your $L8s/1up
model before you run a simulation. 8'"/gC{
Click on various parts of the model in the 3D Design View. Or use the System sFCs_u1tNN
Navigator to select different surfaces and view their Properties. I%> ]!X
1.In the System Navigator, click to open BottomSurface of the LightGuide, then FR^w Dm$
click Zones, and then click Texture. |~LjH |*M
2.Select SphericalElement, and then right-click and select Properties from the s4`*0_n
shortcut menu. The Shape tab shows you a graphical representation of the !9 LAX M
spherical bump shape that is the bottom of the light guide. t0H=NUP8
You might be curious as to why you cannot see the 3D texture property zones you +1jqCW
defined. They are invisible by default, because drawing thousands of texture h $ iyclX
elements can make displaying and exploring the model somewhat slow. If you _8pkejg
choose to make them visible, 3D textures are displayed in wireframe, even if the ;To+,`?E;q
display mode is set to translucent. Wireframe rendering displays a bit faster and 1= 5'R/k
shows more of the technical details. s k6|_
92 * LightTools Introductory Tutorial yn ":!4U1
iH}rI'U.
HAPTER 5 Introduction to Backlight Design [I<'E
LX
C q\ y#
1.Rotate and zoom the model to that you can see something like the illustration T>Rf?%o
below: 1 qKxg
. sFM>gG
2.To reveal the Property Zones: 1fhK {9#
a.Right-click in the Design View and select View Preferences to display this f9XO9N,hE:
dialog box. h9w^7MbO
b.On the Visibility tab, click the Property Zone check box to turn it on. )7 "DR+;:
c.Click OK. Y1_6\zpA
You will see the wire frame rendering of the spherical bumps on the h8= MVh(I
bottom surface, and a solid color above it. The solid color is the 3D texture VueQP|
of the BEFs (brightness-enhancing films) built automatically by the utility.
