The default number of bumps is 100 (10 X 10). You need to change these .k -!/ ^
parameters to match your design. Note that LightTools allows many other JA09 o(
placement options, but you will use the Bezier placement option for this &|fPskpy
example. Z~AgZM
R
5.On both the X Placement tab and Y Placement tab, change the Number of Z'~/=a)7
Bumps parameter to 300, as shown in the following figure. Click Apply after Cy\ o {6
each change. ntxaFVD
6.Click OK to close the dialog box. $Sgq 7
Note that the number of bumps is 300 X 300, which results in about 90,000 v%muno,
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a a! 3e Z,
manner defined by the Bezier parameterization option. Please see Chapter 5 of rL,kDSLs
the LightTools Core Module User’s Guide for more information. With the NT=)</v
current parameter values, the Bezier option varies the bump spacing along the f"-3'kqo
length of the light guide. The spacing in the orthogonal direction is constant. }SFmv},Ij
The X and Y refer to the local coordinate system of the surface. 7q&T2?GEN
LightTools Introductory Tutorial * 91 GY rUB59
5cj&D74o
HAPTER 5 Introduction to Backlight Design LEg ?/!LIT
C {nMCU{*k
Examining Surface Properties g;~$xXn
Using the methods described in previous chapters, you may want to check your 2WS Wfh
model before you run a simulation. ,&iEn}xG7i
Click on various parts of the model in the 3D Design View. Or use the System m KJO?7tj
Navigator to select different surfaces and view their Properties. q*! Vyk
1.In the System Navigator, click to open BottomSurface of the LightGuide, then =5O&4G`}
click Zones, and then click Texture. kl|m @Nxp
2.Select SphericalElement, and then right-click and select Properties from the d@? zCFD
shortcut menu. The Shape tab shows you a graphical representation of the qtjx<`EK>
spherical bump shape that is the bottom of the light guide. JM fv|>=
You might be curious as to why you cannot see the 3D texture property zones you
_ 'K6S
defined. They are invisible by default, because drawing thousands of texture 6?'; ip
elements can make displaying and exploring the model somewhat slow. If you 4D[(X=FSU
choose to make them visible, 3D textures are displayed in wireframe, even if the .[
s6x5M
display mode is set to translucent. Wireframe rendering displays a bit faster and z(#CO<C.t
shows more of the technical details. q }]z8 L
92 * LightTools Introductory Tutorial JSoInR1E
)_k U,RvZ
HAPTER 5 Introduction to Backlight Design !jg<
S >S5
C )0\D1IFJ
1.Rotate and zoom the model to that you can see something like the illustration WM0-F@_
below: %<>|cO
. &x3R+(H {
2.To reveal the Property Zones: "`V:4uz
a.Right-click in the Design View and select View Preferences to display this ?NxaJ^
dialog box. %~\I*v04
b.On the Visibility tab, click the Property Zone check box to turn it on. 6RfS _
c.Click OK. CN6b 982&
You will see the wire frame rendering of the spherical bumps on the ] V,#>'
bottom surface, and a solid color above it. The solid color is the 3D texture ^3C%&
of the BEFs (brightness-enhancing films) built automatically by the utility.
