The default number of bumps is 100 (10 X 10). You need to change these P T;{U<5
parameters to match your design. Note that LightTools allows many other GW A T0
placement options, but you will use the Bezier placement option for this & ;DCN
example. Rw?w7?I
5.On both the X Placement tab and Y Placement tab, change the Number of o%_-u
+
Bumps parameter to 300, as shown in the following figure. Click Apply after s<!A< +Sh
each change. ZFtx&vr P
6.Click OK to close the dialog box. ~su>RolaX
Note that the number of bumps is 300 X 300, which results in about 90,000 bBi>BP =
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a }b4 56J
manner defined by the Bezier parameterization option. Please see Chapter 5 of $MR1
*_\V
the LightTools Core Module User’s Guide for more information. With the *j3 U+H V
current parameter values, the Bezier option varies the bump spacing along the jr` swyg
length of the light guide. The spacing in the orthogonal direction is constant. f Fi=/}
The X and Y refer to the local coordinate system of the surface. tK3$, 9+
LightTools Introductory Tutorial * 91 " 9;
j,OA>{-$
HAPTER 5 Introduction to Backlight Design *$A`+D9
C Zz0er|9]Q
Examining Surface Properties |Yl i~Qx
Using the methods described in previous chapters, you may want to check your K*:=d }^
model before you run a simulation. sPNm .W$_
Click on various parts of the model in the 3D Design View. Or use the System /nO_ e
Navigator to select different surfaces and view their Properties. e| t x`yA
1.In the System Navigator, click to open BottomSurface of the LightGuide, then $n<1D -0!r
click Zones, and then click Texture. I#OZ:g^
2.Select SphericalElement, and then right-click and select Properties from the D"4*l5l
shortcut menu. The Shape tab shows you a graphical representation of the W> TG?hH
spherical bump shape that is the bottom of the light guide. tR!C8:u
You might be curious as to why you cannot see the 3D texture property zones you <-1:o*8:}
defined. They are invisible by default, because drawing thousands of texture /we]i1-9
elements can make displaying and exploring the model somewhat slow. If you M i.#x_
choose to make them visible, 3D textures are displayed in wireframe, even if the fM.#FT??
display mode is set to translucent. Wireframe rendering displays a bit faster and Uh.swBC n
shows more of the technical details. |sGJum&=
92 * LightTools Introductory Tutorial .i;.5)shsu
fq>{5ODO
HAPTER 5 Introduction to Backlight Design "~VKUvDu
C `+Nv =vk
1.Rotate and zoom the model to that you can see something like the illustration !$NK7-
below: 9wx]xg4l"
. &J /EBmY[
2.To reveal the Property Zones: M[q hy.
a.Right-click in the Design View and select View Preferences to display this @x1cV_s[
dialog box. 9,8/DW.K
b.On the Visibility tab, click the Property Zone check box to turn it on. kI"9T`owR
c.Click OK. y{M7kYWtHV
You will see the wire frame rendering of the spherical bumps on the ~C{:G;Iy0
bottom surface, and a solid color above it. The solid color is the 3D texture E]Mx<7;\.
of the BEFs (brightness-enhancing films) built automatically by the utility.
