The default number of bumps is 100 (10 X 10). You need to change these -&;TA0~;
parameters to match your design. Note that LightTools allows many other t
Pf40`@
placement options, but you will use the Bezier placement option for this 6RM/GM
example. 1cGmg1U ;
5.On both the X Placement tab and Y Placement tab, change the Number of ~Z+%d9ode
Bumps parameter to 300, as shown in the following figure. Click Apply after 3F0 N^)@
each change. 9cg U T@a
6.Click OK to close the dialog box. 2%> FR4a
Note that the number of bumps is 300 X 300, which results in about 90,000 C7vxw-o|&p
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a Tr|JYLwF
manner defined by the Bezier parameterization option. Please see Chapter 5 of P$sxr
the LightTools Core Module User’s Guide for more information. With the X|[`P<'N<
current parameter values, the Bezier option varies the bump spacing along the q =Il|Nb>
length of the light guide. The spacing in the orthogonal direction is constant. ]~%6JJN7
The X and Y refer to the local coordinate system of the surface. ^ &)|sP
LightTools Introductory Tutorial * 91 I |J/F}@p
OH"XrCX7n
HAPTER 5 Introduction to Backlight Design {U1m.30n
C w:l"\Tm
Examining Surface Properties s7EinI{^
Using the methods described in previous chapters, you may want to check your T KjFp%
model before you run a simulation. @H<q"-J
Click on various parts of the model in the 3D Design View. Or use the System <X5 fUU"+U
Navigator to select different surfaces and view their Properties. <1 pEwI~
1.In the System Navigator, click to open BottomSurface of the LightGuide, then KF/-wZ"1s
click Zones, and then click Texture. ?}7p"3j'z
2.Select SphericalElement, and then right-click and select Properties from the KU;9}!#
shortcut menu. The Shape tab shows you a graphical representation of the �{x7,
spherical bump shape that is the bottom of the light guide. gJhiGYx
You might be curious as to why you cannot see the 3D texture property zones you a: S -
defined. They are invisible by default, because drawing thousands of texture 6 r_)sHf
elements can make displaying and exploring the model somewhat slow. If you {Pm Z9
choose to make them visible, 3D textures are displayed in wireframe, even if the b[ 7 ]F
display mode is set to translucent. Wireframe rendering displays a bit faster and 8X0z~ &
shows more of the technical details. 'n|5ZhXPB
92 * LightTools Introductory Tutorial ^t"'rD-I
uGt -l4
HAPTER 5 Introduction to Backlight Design Sc
C Tf)*4O 4@'
1.Rotate and zoom the model to that you can see something like the illustration _
J[
below: oE~Bq/p
. 5-G@L?~Vw
2.To reveal the Property Zones: wPl%20t
a.Right-click in the Design View and select View Preferences to display this x m@_IL&P
dialog box. W%)Y#C
b.On the Visibility tab, click the Property Zone check box to turn it on. s@DLt+ O5
c.Click OK. @I*{f
You will see the wire frame rendering of the spherical bumps on the $g7<Y*t[
bottom surface, and a solid color above it. The solid color is the 3D texture ASfaX:ke
of the BEFs (brightness-enhancing films) built automatically by the utility.
