The default number of bumps is 100 (10 X 10). You need to change these 1#8~@CQ ::
parameters to match your design. Note that LightTools allows many other HGi%b5:<=M
placement options, but you will use the Bezier placement option for this g gpa !R
example. Fq`@sM $
5.On both the X Placement tab and Y Placement tab, change the Number of :XTxrYt28
Bumps parameter to 300, as shown in the following figure. Click Apply after \Ym!5,^o
each change. i[w& !mn%
6.Click OK to close the dialog box. Yv2L0bUo:
Note that the number of bumps is 300 X 300, which results in about 90,000 44KWS~
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a |t z{Es<`B
manner defined by the Bezier parameterization option. Please see Chapter 5 of JvaHH!>d/
the LightTools Core Module User’s Guide for more information. With the RWoVN$i>
current parameter values, the Bezier option varies the bump spacing along the BqdGU-Q
length of the light guide. The spacing in the orthogonal direction is constant. QUg<~q)Oq
The X and Y refer to the local coordinate system of the surface. Bo1 t}#7
LightTools Introductory Tutorial * 91 Zu>CR_C
7M_GGjP
HAPTER 5 Introduction to Backlight Design t}MT<Jj
C B B^81{A
Examining Surface Properties W)Y:2P<.
Using the methods described in previous chapters, you may want to check your XhN?E-WywQ
model before you run a simulation. E.-2 /'i
Click on various parts of the model in the 3D Design View. Or use the System gKgdu($NJ
Navigator to select different surfaces and view their Properties. ey\(*Tu9
1.In the System Navigator, click to open BottomSurface of the LightGuide, then QU F1_Sa
click Zones, and then click Texture. '*t<g@ 2$
2.Select SphericalElement, and then right-click and select Properties from the V#c =O}
shortcut menu. The Shape tab shows you a graphical representation of the QkLcs6)R
spherical bump shape that is the bottom of the light guide. p %/ lP{
You might be curious as to why you cannot see the 3D texture property zones you y+ i zC+
defined. They are invisible by default, because drawing thousands of texture = N:5# A
elements can make displaying and exploring the model somewhat slow. If you mXM U
choose to make them visible, 3D textures are displayed in wireframe, even if the >feeV k
display mode is set to translucent. Wireframe rendering displays a bit faster and P(3$XMx
shows more of the technical details. 6 \ %#=GG
92 * LightTools Introductory Tutorial zE7)4!
A-eCc #I
HAPTER 5 Introduction to Backlight Design FY]Et= p
C M?kXzb \O
1.Rotate and zoom the model to that you can see something like the illustration @v.?z2h
below: -Byl~n3*D
. qSaCl6[Do
2.To reveal the Property Zones: /)rv Ndn
a.Right-click in the Design View and select View Preferences to display this XH Y,;4
dialog box. HD z"i
b.On the Visibility tab, click the Property Zone check box to turn it on. j tqU`|FSQ
c.Click OK. SK_N|X].
You will see the wire frame rendering of the spherical bumps on the 8P&z@E{y
bottom surface, and a solid color above it. The solid color is the 3D texture gV'=u z v
of the BEFs (brightness-enhancing films) built automatically by the utility.
