The default number of bumps is 100 (10 X 10). You need to change these {\0V$#q
parameters to match your design. Note that LightTools allows many other s9CmR]C
placement options, but you will use the Bezier placement option for this MooH` 2Fd
example. Q~Mkf& s
5.On both the X Placement tab and Y Placement tab, change the Number of 1~K'r&
Bumps parameter to 300, as shown in the following figure. Click Apply after U!r8}@
each change. )AkBo
6.Click OK to close the dialog box. n:/!{.
Note that the number of bumps is 300 X 300, which results in about 90,000
d9k`
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a X5/fy"g&
manner defined by the Bezier parameterization option. Please see Chapter 5 of xcWR#z{z
the LightTools Core Module User’s Guide for more information. With the S N ?Z7
current parameter values, the Bezier option varies the bump spacing along the s. Z{mnD6
length of the light guide. The spacing in the orthogonal direction is constant. W Vpx
The X and Y refer to the local coordinate system of the surface. T%6JVFD
LightTools Introductory Tutorial * 91 ~^a >C
!"qT2<A
HAPTER 5 Introduction to Backlight Design dX)a D
$m
C aH uMm&
Examining Surface Properties *w(n% f
Using the methods described in previous chapters, you may want to check your Lg!E
model before you run a simulation. w ods
Click on various parts of the model in the 3D Design View. Or use the System TY %zw6 #p
Navigator to select different surfaces and view their Properties. bk<Rp84vL
1.In the System Navigator, click to open BottomSurface of the LightGuide, then ;6pB7N
click Zones, and then click Texture. 77[TqRLf
2.Select SphericalElement, and then right-click and select Properties from the 7afG4
(<k
shortcut menu. The Shape tab shows you a graphical representation of the n5UUoBv
spherical bump shape that is the bottom of the light guide. ,:L^vG @*
You might be curious as to why you cannot see the 3D texture property zones you Pa Q lQ#
defined. They are invisible by default, because drawing thousands of texture &-Ch>:[
elements can make displaying and exploring the model somewhat slow. If you dGO FSH
choose to make them visible, 3D textures are displayed in wireframe, even if the W;7$Dq:
display mode is set to translucent. Wireframe rendering displays a bit faster and uGC5XX^
shows more of the technical details. 0*5Jq#5
92 * LightTools Introductory Tutorial ]R)wBug
;a1DIUm'
HAPTER 5 Introduction to Backlight Design <dP \vLH_
C 81y<Uz 6
1.Rotate and zoom the model to that you can see something like the illustration : stHc,
below: OXQA(%MK
. ^_@[1'^
2.To reveal the Property Zones: }YdC[b$j^
a.Right-click in the Design View and select View Preferences to display this oOND]>
dialog box. TxF^zx\
b.On the Visibility tab, click the Property Zone check box to turn it on. ynM~&]fk#k
c.Click OK. rrRv 7J&Q
You will see the wire frame rendering of the spherical bumps on the ` WL3aI":
bottom surface, and a solid color above it. The solid color is the 3D texture DKfpap}8u
of the BEFs (brightness-enhancing films) built automatically by the utility.
