The default number of bumps is 100 (10 X 10). You need to change these @kI^6(.
parameters to match your design. Note that LightTools allows many other d:<{!}BR3
placement options, but you will use the Bezier placement option for this ffuV$#
example.
gt}/C4|
5.On both the X Placement tab and Y Placement tab, change the Number of ;uR8pz e
Bumps parameter to 300, as shown in the following figure. Click Apply after W c-P= J*m
each change. ?$=N!>P#
6.Click OK to close the dialog box. b$ .N8W%
Note that the number of bumps is 300 X 300, which results in about 90,000 [dOPOA/d
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a LT2m wJl
manner defined by the Bezier parameterization option. Please see Chapter 5 of X$PT-~!a
the LightTools Core Module User’s Guide for more information. With the `,\WhJ? 9
current parameter values, the Bezier option varies the bump spacing along the {9' "!fH
length of the light guide. The spacing in the orthogonal direction is constant. ]yCmGt+b
The X and Y refer to the local coordinate system of the surface. o8Q(, P
LightTools Introductory Tutorial * 91 f[h=>O
Q$V xm+
HAPTER 5 Introduction to Backlight Design M7!&gFv8
C ?Mji'ZW}
Examining Surface Properties > {npg2
Using the methods described in previous chapters, you may want to check your Hsx`P
model before you run a simulation. Y @pkfH
Click on various parts of the model in the 3D Design View. Or use the System 4/Ok/I
Navigator to select different surfaces and view their Properties. iK=H9j
1.In the System Navigator, click to open BottomSurface of the LightGuide, then .+{nfmc,c
click Zones, and then click Texture. AVyo)=&
2.Select SphericalElement, and then right-click and select Properties from the ,ulTZV
shortcut menu. The Shape tab shows you a graphical representation of the %oC]Rpdu
spherical bump shape that is the bottom of the light guide. z\fD}`^8
You might be curious as to why you cannot see the 3D texture property zones you M*aE) D '
defined. They are invisible by default, because drawing thousands of texture <NT /+>:2
elements can make displaying and exploring the model somewhat slow. If you < ~x5{p
choose to make them visible, 3D textures are displayed in wireframe, even if the ]#S.L '
display mode is set to translucent. Wireframe rendering displays a bit faster and . eq-i>
shows more of the technical details. D
zl#[|q
92 * LightTools Introductory Tutorial K JcdX9x
}6m5MH$7q
HAPTER 5 Introduction to Backlight Design +(UrqK4Av
C SZv w>=)a
1.Rotate and zoom the model to that you can see something like the illustration Nj sP"
below: od?Q&'A
. o.}^6.h"
2.To reveal the Property Zones: 5\EHu8
a.Right-click in the Design View and select View Preferences to display this IO]Oo3
dialog box. Q F[9Zn
b.On the Visibility tab, click the Property Zone check box to turn it on.
w&:h^u
c.Click OK. iT9cw`A^ %
You will see the wire frame rendering of the spherical bumps on the z9;v E7n!
bottom surface, and a solid color above it. The solid color is the 3D texture p B?a5jpA
of the BEFs (brightness-enhancing films) built automatically by the utility.
