The default number of bumps is 100 (10 X 10). You need to change these V?Ye^ -29
parameters to match your design. Note that LightTools allows many other [Ma
d ~;
placement options, but you will use the Bezier placement option for this 1;y?!;FD
example. \-)augq([
5.On both the X Placement tab and Y Placement tab, change the Number of sVT\e*4m}
Bumps parameter to 300, as shown in the following figure. Click Apply after GAcU8 MD
each change. 8E\6RjM
6.Click OK to close the dialog box. lnRbvulH
Note that the number of bumps is 300 X 300, which results in about 90,000 ik|iAWy
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a n$(_ (&
manner defined by the Bezier parameterization option. Please see Chapter 5 of 4krK CD>|G
the LightTools Core Module User’s Guide for more information. With the R9V v*F]m@
current parameter values, the Bezier option varies the bump spacing along the VtC1TZ3-7
length of the light guide. The spacing in the orthogonal direction is constant. h8tKYm
The X and Y refer to the local coordinate system of the surface. 1\ BQq
LightTools Introductory Tutorial * 91 % wS5 m#n
EU-=\Y
HAPTER 5 Introduction to Backlight Design qUF}rl S=r
C *ZA.O
Examining Surface Properties IH0qx_;P&
Using the methods described in previous chapters, you may want to check your [#6Eax,j
model before you run a simulation. vOYG&)Jm
Click on various parts of the model in the 3D Design View. Or use the System M `bEnu
Navigator to select different surfaces and view their Properties. @-Js)zcl q
1.In the System Navigator, click to open BottomSurface of the LightGuide, then ` O|PP3S
click Zones, and then click Texture. WD,iY_'7u^
2.Select SphericalElement, and then right-click and select Properties from the Ok &u4'<
shortcut menu. The Shape tab shows you a graphical representation of the o w<.Dh
spherical bump shape that is the bottom of the light guide. QC *>
q o
You might be curious as to why you cannot see the 3D texture property zones you 6@@J>S>
defined. They are invisible by default, because drawing thousands of texture rN%aP-sa<
elements can make displaying and exploring the model somewhat slow. If you 'X(G><R9
choose to make them visible, 3D textures are displayed in wireframe, even if the AT4G] pT
display mode is set to translucent. Wireframe rendering displays a bit faster and 7'9~Kx&+
shows more of the technical details. <UcbBcW,
92 * LightTools Introductory Tutorial bC@9
*/i
L0O },O
HAPTER 5 Introduction to Backlight Design 5>'1[e45
C h tn?iLq
1.Rotate and zoom the model to that you can see something like the illustration ~&Gw[Nd1
below: %}asw/WiUa
. h&}XG\ioNA
2.To reveal the Property Zones: %XieKL
a.Right-click in the Design View and select View Preferences to display this @4N@cM0
dialog box. p%v +\T2r
b.On the Visibility tab, click the Property Zone check box to turn it on. U^$o< 2
c.Click OK. P9aG Dm a
You will see the wire frame rendering of the spherical bumps on the GCTf/V\#
bottom surface, and a solid color above it. The solid color is the 3D texture E#=slj @
of the BEFs (brightness-enhancing films) built automatically by the utility.
