The default number of bumps is 100 (10 X 10). You need to change these lv&w p@
parameters to match your design. Note that LightTools allows many other 3Ab$
placement options, but you will use the Bezier placement option for this 9K(b Z {
example. M$A !
5.On both the X Placement tab and Y Placement tab, change the Number of I2Q?7p
Bumps parameter to 300, as shown in the following figure. Click Apply after o #b9M4O
each change. Q+N @j]'
6.Click OK to close the dialog box. |@|D''u>6
Note that the number of bumps is 300 X 300, which results in about 90,000 gI{F"7fa=
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a M#|xj <p
manner defined by the Bezier parameterization option. Please see Chapter 5 of A
76yz`D
the LightTools Core Module User’s Guide for more information. With the 2 ARh-zLb
current parameter values, the Bezier option varies the bump spacing along the O-Y E6u
length of the light guide. The spacing in the orthogonal direction is constant. z05pVe/5
The X and Y refer to the local coordinate system of the surface. i:To8kdO
LightTools Introductory Tutorial * 91 M-t9zT
Jt][b
HAPTER 5 Introduction to Backlight Design 7.-|3Wcg
C K~G^jAk+
Examining Surface Properties ~C+T|
Using the methods described in previous chapters, you may want to check your ,)8Hl[ y
model before you run a simulation. ;kA2"c] m
Click on various parts of the model in the 3D Design View. Or use the System v\u+=}r l
Navigator to select different surfaces and view their Properties. 4Qs#ws])
1.In the System Navigator, click to open BottomSurface of the LightGuide, then }=5(*Vg
click Zones, and then click Texture. WOoVVjM M
2.Select SphericalElement, and then right-click and select Properties from the <#i'3TUR
shortcut menu. The Shape tab shows you a graphical representation of the )V rHP9fu
spherical bump shape that is the bottom of the light guide. u]-$]zIH
You might be curious as to why you cannot see the 3D texture property zones you :PJjy6,1
defined. They are invisible by default, because drawing thousands of texture )JON&~C
elements can make displaying and exploring the model somewhat slow. If you nMqU6X>P!
choose to make them visible, 3D textures are displayed in wireframe, even if the 'UCL? $
display mode is set to translucent. Wireframe rendering displays a bit faster and >~k
Y{_
shows more of the technical details. 0jMrL\>C
92 * LightTools Introductory Tutorial K+H82$
#
,P]{*uqGiB
HAPTER 5 Introduction to Backlight Design |/ Z 4lcI
C E.brQx#}
1.Rotate and zoom the model to that you can see something like the illustration ygG9ht
below: ~ -x\E#(
. J<D =\
2.To reveal the Property Zones: M_DkjuR
a.Right-click in the Design View and select View Preferences to display this (;0]V+-
dialog box. !+U.)u9 '
b.On the Visibility tab, click the Property Zone check box to turn it on. 7P]pk=mo
c.Click OK. L;;x%>
You will see the wire frame rendering of the spherical bumps on the ZO}*^
bottom surface, and a solid color above it. The solid color is the 3D texture z> SCv;Q
of the BEFs (brightness-enhancing films) built automatically by the utility.
