The default number of bumps is 100 (10 X 10). You need to change these r8k.I4
parameters to match your design. Note that LightTools allows many other 7AOjlC9R}
placement options, but you will use the Bezier placement option for this "#3p= }]
example. IK
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5.On both the X Placement tab and Y Placement tab, change the Number of TB8a#bK4
Bumps parameter to 300, as shown in the following figure. Click Apply after ranlbxp2l
each change. _YT9 zG
6.Click OK to close the dialog box. [i
]
Note that the number of bumps is 300 X 300, which results in about 90,000 B uv4&.Z}
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a GWQ_X9+q
manner defined by the Bezier parameterization option. Please see Chapter 5 of #VLO6
the LightTools Core Module User’s Guide for more information. With the ITq $8
current parameter values, the Bezier option varies the bump spacing along the -kv'C6gB
length of the light guide. The spacing in the orthogonal direction is constant. &ND8^lR=Y;
The X and Y refer to the local coordinate system of the surface. E&RiEhuv
LightTools Introductory Tutorial * 91 ;)SWUXa;{
pYt venBy
HAPTER 5 Introduction to Backlight Design ,rO>5$w.
C ~@v<B
I
Examining Surface Properties ^<}>]F_
Using the methods described in previous chapters, you may want to check your r=`]L-}V
model before you run a simulation. t!u{sr{j=
Click on various parts of the model in the 3D Design View. Or use the System Bl
>)GX\l
Navigator to select different surfaces and view their Properties. LHS^[}x^1
1.In the System Navigator, click to open BottomSurface of the LightGuide, then >o #^)LN
click Zones, and then click Texture. o|FY-+
2.Select SphericalElement, and then right-click and select Properties from the clc j5=:
shortcut menu. The Shape tab shows you a graphical representation of the !R`) S7!
spherical bump shape that is the bottom of the light guide. 1\~-No
You might be curious as to why you cannot see the 3D texture property zones you 9T#JlV
defined. They are invisible by default, because drawing thousands of texture p?#cn
elements can make displaying and exploring the model somewhat slow. If you Ho FFce7o
choose to make them visible, 3D textures are displayed in wireframe, even if the C8J3^ ?7E
display mode is set to translucent. Wireframe rendering displays a bit faster and W8/8V,
shows more of the technical details. cl4Vi%
92 * LightTools Introductory Tutorial )(Z)yz
Z Rjqjx
HAPTER 5 Introduction to Backlight Design R>3a?.X
C 5GwXZ;(G
1.Rotate and zoom the model to that you can see something like the illustration <gdKuoY
below: Gz>M`M`[4
. }`SXUM_sD`
2.To reveal the Property Zones: Sv E|"
a.Right-click in the Design View and select View Preferences to display this z@_ 9.n]
dialog box. #]BpTpRAe<
b.On the Visibility tab, click the Property Zone check box to turn it on. w^.^XK4v.
c.Click OK. RC S 91[
You will see the wire frame rendering of the spherical bumps on the P dg%:aY
bottom surface, and a solid color above it. The solid color is the 3D texture !JkH$~
of the BEFs (brightness-enhancing films) built automatically by the utility.
