The default number of bumps is 100 (10 X 10). You need to change these fucG 9B
parameters to match your design. Note that LightTools allows many other h(l 4\)
placement options, but you will use the Bezier placement option for this 5ro^<P0f**
example. pX `BDYg.
5.On both the X Placement tab and Y Placement tab, change the Number of SvLI%>B=9
Bumps parameter to 300, as shown in the following figure. Click Apply after $F"'= +0
each change. Nr8#/H2f
6.Click OK to close the dialog box. y@Z@ eK3
Note that the number of bumps is 300 X 300, which results in about 90,000 T{<riJ`O
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a ZF^$?;'3
manner defined by the Bezier parameterization option. Please see Chapter 5 of Q'>pOtJG*J
the LightTools Core Module User’s Guide for more information. With the f~
kz=R=
current parameter values, the Bezier option varies the bump spacing along the wc`UcGO
length of the light guide. The spacing in the orthogonal direction is constant. E">FH >8K}
The X and Y refer to the local coordinate system of the surface. Y@B0.5U 2
LightTools Introductory Tutorial * 91 ammlUWl
%/iD@2r
HAPTER 5 Introduction to Backlight Design f9ux+XQk 9
C iq*]CF
Examining Surface Properties |mvY=t
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Using the methods described in previous chapters, you may want to check your v"ZNS
model before you run a simulation. |qTvy,U[
Click on various parts of the model in the 3D Design View. Or use the System +?y ', Ir
Navigator to select different surfaces and view their Properties. Uq/FH @E=
1.In the System Navigator, click to open BottomSurface of the LightGuide, then |7ct2o~un
click Zones, and then click Texture. i;B &~
2.Select SphericalElement, and then right-click and select Properties from the i 7D[5!
shortcut menu. The Shape tab shows you a graphical representation of the )}w2'(!X8
spherical bump shape that is the bottom of the light guide. ?TTtGbvU
You might be curious as to why you cannot see the 3D texture property zones you t$~CLq5a d
defined. They are invisible by default, because drawing thousands of texture W'lejOiw
elements can make displaying and exploring the model somewhat slow. If you %n?&#_G|
choose to make them visible, 3D textures are displayed in wireframe, even if the %x{jmZ$}
display mode is set to translucent. Wireframe rendering displays a bit faster and ,Y9bXC8+dU
shows more of the technical details. ~i_YrTp
92 * LightTools Introductory Tutorial -4wr)zjfW
u|(;SY
HAPTER 5 Introduction to Backlight Design iF,%^95=
C M18 > %zM
1.Rotate and zoom the model to that you can see something like the illustration Ck1 {\=t
below: jEh Px
. %vn "tp
2.To reveal the Property Zones: ^cRAtoa
a.Right-click in the Design View and select View Preferences to display this R|D%1 @i]
dialog box. Ln+;HorZ]
b.On the Visibility tab, click the Property Zone check box to turn it on. = 1#o bB
c.Click OK. N$ oQK(
You will see the wire frame rendering of the spherical bumps on the Ob! NC&
bottom surface, and a solid color above it. The solid color is the 3D texture OTe h8h
of the BEFs (brightness-enhancing films) built automatically by the utility.
