The default number of bumps is 100 (10 X 10). You need to change these uXq.
]ub
parameters to match your design. Note that LightTools allows many other r(2uu
placement options, but you will use the Bezier placement option for this 4 N7^?
example. T"}vAG( .O
5.On both the X Placement tab and Y Placement tab, change the Number of
4YX3+oS
Bumps parameter to 300, as shown in the following figure. Click Apply after {GcO3G#FZ
each change. A nvRxb.e
6.Click OK to close the dialog box. ! &Pui{F
Note that the number of bumps is 300 X 300, which results in about 90,000 1&o|TT/
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a C\/L v.
manner defined by the Bezier parameterization option. Please see Chapter 5 of BI}Cg{^km
the LightTools Core Module User’s Guide for more information. With the =iD 3Yt
current parameter values, the Bezier option varies the bump spacing along the "2T#MO/
length of the light guide. The spacing in the orthogonal direction is constant. 5Zva :
The X and Y refer to the local coordinate system of the surface. uL/ m u<
LightTools Introductory Tutorial * 91 gOOPe5+ J
5lT*hF
HAPTER 5 Introduction to Backlight Design D{~fDRR
C {& T_sw @[
Examining Surface Properties U~l$\ c
Using the methods described in previous chapters, you may want to check your [R7Y}k:9U
model before you run a simulation. r{%q f;
Click on various parts of the model in the 3D Design View. Or use the System M+ 9 gL3W
Navigator to select different surfaces and view their Properties. (DP &B%Sf
1.In the System Navigator, click to open BottomSurface of the LightGuide, then }I6vqG
click Zones, and then click Texture. f.` *Qg L
2.Select SphericalElement, and then right-click and select Properties from the qXjxNrK
shortcut menu. The Shape tab shows you a graphical representation of the QS]1daMIK<
spherical bump shape that is the bottom of the light guide. lR6x3C
H@
You might be curious as to why you cannot see the 3D texture property zones you v2;`f+
defined. They are invisible by default, because drawing thousands of texture CoAv Sw
elements can make displaying and exploring the model somewhat slow. If you ;?g6QIN9
choose to make them visible, 3D textures are displayed in wireframe, even if the ;
p {[1
display mode is set to translucent. Wireframe rendering displays a bit faster and M|(Q0 _8
shows more of the technical details. Vr1<^Ib
92 * LightTools Introductory Tutorial Zdo'{ $
Yr=Y@~ XL
HAPTER 5 Introduction to Backlight Design f &wb
C Wh 2tNyS
1.Rotate and zoom the model to that you can see something like the illustration x* &|0n.D
below: B|AV$N*
. W#C*5@ 8
2.To reveal the Property Zones: ;x 1 PS
a.Right-click in the Design View and select View Preferences to display this h_I DO%
dialog box. 4^OY
C
b.On the Visibility tab, click the Property Zone check box to turn it on. M b1s F
c.Click OK. !V g`
You will see the wire frame rendering of the spherical bumps on the JyOo 1E.
bottom surface, and a solid color above it. The solid color is the 3D texture f/Bp.Yw L
of the BEFs (brightness-enhancing films) built automatically by the utility.
