The default number of bumps is 100 (10 X 10). You need to change these 06 QU
parameters to match your design. Note that LightTools allows many other SArfczoB
placement options, but you will use the Bezier placement option for this )O,wRd>5
example. 3`8dii
5.On both the X Placement tab and Y Placement tab, change the Number of >qR7'Q wP
Bumps parameter to 300, as shown in the following figure. Click Apply after 8g\wVKkTQp
each change. OnZF6yfN=3
6.Click OK to close the dialog box. nD7|8,'
Note that the number of bumps is 300 X 300, which results in about 90,000 a% Uw;6|{
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a ]JOephX2R
manner defined by the Bezier parameterization option. Please see Chapter 5 of kmryu=
the LightTools Core Module User’s Guide for more information. With the HbcOTd)=5
current parameter values, the Bezier option varies the bump spacing along the !7}IqS s
length of the light guide. The spacing in the orthogonal direction is constant. o4$Ott%Wm
The X and Y refer to the local coordinate system of the surface. \[:PykS
LightTools Introductory Tutorial * 91
s[3e=N
led))qd@V-
HAPTER 5 Introduction to Backlight Design 2ck 4C/ h
C 4| `Yz%'
Examining Surface Properties i=YXKe6fD
Using the methods described in previous chapters, you may want to check your Y RP m^kW
model before you run a simulation. MWiMUTZg3
Click on various parts of the model in the 3D Design View. Or use the System /D]Kk m)
Navigator to select different surfaces and view their Properties. / /'Tck
1.In the System Navigator, click to open BottomSurface of the LightGuide, then {9L 5Q
click Zones, and then click Texture. yQ9ZhdQS
2.Select SphericalElement, and then right-click and select Properties from the pe9@N9_5
shortcut menu. The Shape tab shows you a graphical representation of the + :V rip
spherical bump shape that is the bottom of the light guide. zbN A \.y
You might be curious as to why you cannot see the 3D texture property zones you g& k58{e
defined. They are invisible by default, because drawing thousands of texture F*M|<E=
elements can make displaying and exploring the model somewhat slow. If you "NDxgJ%J35
choose to make them visible, 3D textures are displayed in wireframe, even if the Ht#@'x
display mode is set to translucent. Wireframe rendering displays a bit faster and Z,K7Ot0
shows more of the technical details. %?bcT[|3
92 * LightTools Introductory Tutorial bp#:UUO%S
`-_N@E1'>
HAPTER 5 Introduction to Backlight Design ba ee?6
C vv6?V# {
1.Rotate and zoom the model to that you can see something like the illustration EeB ]X24
below: 3 t)v %S|k
. P"1 S$oc
2.To reveal the Property Zones: .e @>
a.Right-click in the Design View and select View Preferences to display this .x!T+`l>8I
dialog box. ZU^I H9
b.On the Visibility tab, click the Property Zone check box to turn it on. FW8-'~
c.Click OK. Bn?:w\%Ue
You will see the wire frame rendering of the spherical bumps on the m
41t(i
bottom surface, and a solid color above it. The solid color is the 3D texture XF|WCZUnY%
of the BEFs (brightness-enhancing films) built automatically by the utility.
