The default number of bumps is 100 (10 X 10). You need to change these zOV.cI6fZz
parameters to match your design. Note that LightTools allows many other (5-4`:1ux
placement options, but you will use the Bezier placement option for this 7hg)R
@OC
example. .{pc5eUf
5.On both the X Placement tab and Y Placement tab, change the Number of @vy {Q7aM
Bumps parameter to 300, as shown in the following figure. Click Apply after h5vvizruy
each change. +\@)
1
6.Click OK to close the dialog box. 8efQ -^b.
Note that the number of bumps is 300 X 300, which results in about 90,000 // [zUn
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a U6 4WTS@
manner defined by the Bezier parameterization option. Please see Chapter 5 of _[eAA4h
the LightTools Core Module User’s Guide for more information. With the 2swHJ.d\
current parameter values, the Bezier option varies the bump spacing along the x<mHTh:-V
length of the light guide. The spacing in the orthogonal direction is constant. ;rD
M%S@
The X and Y refer to the local coordinate system of the surface. o.)8 A8
LightTools Introductory Tutorial * 91 [;rty<Z^b
"`QI2{!l
HAPTER 5 Introduction to Backlight Design Wr3).m52}P
C )QeXA )
Examining Surface Properties %xa.{`}`U
Using the methods described in previous chapters, you may want to check your u{Z
4M3U
model before you run a simulation. 9e`.H0
Click on various parts of the model in the 3D Design View. Or use the System Oa 8lrP`(
Navigator to select different surfaces and view their Properties. \( S69@ f
1.In the System Navigator, click to open BottomSurface of the LightGuide, then mBp3_E.t
click Zones, and then click Texture. |U~m8e&:
2.Select SphericalElement, and then right-click and select Properties from the !uoQLiH+
shortcut menu. The Shape tab shows you a graphical representation of the n!nXM
spherical bump shape that is the bottom of the light guide. 'G6M:IXno
You might be curious as to why you cannot see the 3D texture property zones you #
p?7{"Ep
defined. They are invisible by default, because drawing thousands of texture S 54N
elements can make displaying and exploring the model somewhat slow. If you I U Mt^z
choose to make them visible, 3D textures are displayed in wireframe, even if the c^4^z"Mo`
display mode is set to translucent. Wireframe rendering displays a bit faster and r)9&'m .:
shows more of the technical details. +{ qX,
92 * LightTools Introductory Tutorial ,3m]jp'
__F?iRrCM
HAPTER 5 Introduction to Backlight Design 1$Jria5n
C X^2Txm d
1.Rotate and zoom the model to that you can see something like the illustration `oDs]90
below: /b$0).fj@,
. [<2#C#P:6
2.To reveal the Property Zones: nBVR)|+M
a.Right-click in the Design View and select View Preferences to display this ]VYv>o`2
dialog box. O%w"bEr)N
b.On the Visibility tab, click the Property Zone check box to turn it on. y<53xZi
c.Click OK. HQpw2bdy
You will see the wire frame rendering of the spherical bumps on the Qh 3V[b r
bottom surface, and a solid color above it. The solid color is the 3D texture ` |L l
of the BEFs (brightness-enhancing films) built automatically by the utility.
