The default number of bumps is 100 (10 X 10). You need to change these ju#6 3
parameters to match your design. Note that LightTools allows many other `y`x k<q
placement options, but you will use the Bezier placement option for this K(gj6SrjV
example. 9QMn%8=j
5.On both the X Placement tab and Y Placement tab, change the Number of ^NDX4 d;
Bumps parameter to 300, as shown in the following figure. Click Apply after =FmU]DV
each change. o!~bR
6.Click OK to close the dialog box. vNC0M:p,
Note that the number of bumps is 300 X 300, which results in about 90,000 /<0D
E22
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a Wv"tAseu
manner defined by the Bezier parameterization option. Please see Chapter 5 of E: GJ$I
the LightTools Core Module User’s Guide for more information. With the (5 ~C
_Y
current parameter values, the Bezier option varies the bump spacing along the PAHlj,n)
length of the light guide. The spacing in the orthogonal direction is constant. ?^~"x.<nr
The X and Y refer to the local coordinate system of the surface. 8-:k@W
LightTools Introductory Tutorial * 91 8(>.^667
<^ U (ya
HAPTER 5 Introduction to Backlight Design g5Rm!T+@I<
C 0>iFXw:fn
Examining Surface Properties >x4[7YAU{
Using the methods described in previous chapters, you may want to check your :eW~nI.Vc
model before you run a simulation. Db(_T8sU
Click on various parts of the model in the 3D Design View. Or use the System |l xy< C4V
Navigator to select different surfaces and view their Properties. +ZKhmb!
1.In the System Navigator, click to open BottomSurface of the LightGuide, then vC:b?0s #(
click Zones, and then click Texture. 9Yyg}l:
2.Select SphericalElement, and then right-click and select Properties from the z U~..;C
shortcut menu. The Shape tab shows you a graphical representation of the K//T}-Uub
spherical bump shape that is the bottom of the light guide. s.` d<(X?
You might be curious as to why you cannot see the 3D texture property zones you |A0$XU{
defined. They are invisible by default, because drawing thousands of texture xXZKj
elements can make displaying and exploring the model somewhat slow. If you SF k#bh
choose to make them visible, 3D textures are displayed in wireframe, even if the Z=@)
display mode is set to translucent. Wireframe rendering displays a bit faster and 5L}>+js2
shows more of the technical details. |xZcT4
92 * LightTools Introductory Tutorial WuFwt\U
9T 2A)a]0
HAPTER 5 Introduction to Backlight Design xn@0pL3B~
C z,FTsR$x
1.Rotate and zoom the model to that you can see something like the illustration 6 1W/BU7O
below: -Zg @D(p F
. ]^9*
t,{9
2.To reveal the Property Zones: V wV Q|UH
a.Right-click in the Design View and select View Preferences to display this `t0f L \T
dialog box. kQVD C,d
b.On the Visibility tab, click the Property Zone check box to turn it on. ShJK&70O
c.Click OK. [!@oRK=~
You will see the wire frame rendering of the spherical bumps on the =5~F6 t o
bottom surface, and a solid color above it. The solid color is the 3D texture -,VhS I
of the BEFs (brightness-enhancing films) built automatically by the utility.
