The default number of bumps is 100 (10 X 10). You need to change these v1r_Z($
parameters to match your design. Note that LightTools allows many other }6J7 <g
placement options, but you will use the Bezier placement option for this (a}
example. g?~ Tguv
5.On both the X Placement tab and Y Placement tab, change the Number of z8[H:W#G
Bumps parameter to 300, as shown in the following figure. Click Apply after (kC} ,}
each change. g6g$nY@Jm
6.Click OK to close the dialog box. 90T%T 2K
Note that the number of bumps is 300 X 300, which results in about 90,000 FxfL+}?Q
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a 9U)t@b
manner defined by the Bezier parameterization option. Please see Chapter 5 of _E6} XNS
the LightTools Core Module User’s Guide for more information. With the 3%R{"Q"
current parameter values, the Bezier option varies the bump spacing along the ^%8qKC`Tt
length of the light guide. The spacing in the orthogonal direction is constant. s^>lOQ=
The X and Y refer to the local coordinate system of the surface. 7B(bH8
LightTools Introductory Tutorial * 91 i7nL_N
A)z PaXZ
HAPTER 5 Introduction to Backlight Design d;~ 3P
C 'e]HP-Y<
Examining Surface Properties 0zbLc%
Using the methods described in previous chapters, you may want to check your [8@kx Cq
model before you run a simulation. 90s;/y(
Click on various parts of the model in the 3D Design View. Or use the System RxZm/:yuJ.
Navigator to select different surfaces and view their Properties. 1s`)yu^`v
1.In the System Navigator, click to open BottomSurface of the LightGuide, then -2\ZzK0tM
click Zones, and then click Texture. 0)AM-/"
2.Select SphericalElement, and then right-click and select Properties from the PXosFz~
shortcut menu. The Shape tab shows you a graphical representation of the 2L2 VVO
spherical bump shape that is the bottom of the light guide. W7L+ 8LU;
You might be curious as to why you cannot see the 3D texture property zones you j
u*fyt
defined. They are invisible by default, because drawing thousands of texture Ad;S=h8 :
elements can make displaying and exploring the model somewhat slow. If you ~XUOW Y75
choose to make them visible, 3D textures are displayed in wireframe, even if the $J"%I$%X=
display mode is set to translucent. Wireframe rendering displays a bit faster and w< 65S
shows more of the technical details. _1sMY hI
92 * LightTools Introductory Tutorial A XBkJ'jd
2@ 9pr
HAPTER 5 Introduction to Backlight Design SY,I >-%
C b]*X<,p
1.Rotate and zoom the model to that you can see something like the illustration lwOf)jK: J
below: 8/3u/
. Qq tC`H\
2.To reveal the Property Zones: ,? g=U8y|
a.Right-click in the Design View and select View Preferences to display this c^=R8y-N
dialog box. oYz!O] j;a
b.On the Visibility tab, click the Property Zone check box to turn it on. 6F`qi: a+
c.Click OK. W]]q=c%2
You will see the wire frame rendering of the spherical bumps on the gYatsFyL
bottom surface, and a solid color above it. The solid color is the 3D texture [ -ISR7D
of the BEFs (brightness-enhancing films) built automatically by the utility.
