The default number of bumps is 100 (10 X 10). You need to change these _jiQL66pY
parameters to match your design. Note that LightTools allows many other B,w:DX
placement options, but you will use the Bezier placement option for this tx gvVQ
example. EqVsxwa
5.On both the X Placement tab and Y Placement tab, change the Number of O{Dm;@J-aM
Bumps parameter to 300, as shown in the following figure. Click Apply after d\\r_ bGW
each change. S!u6dz^[$X
6.Click OK to close the dialog box. zUNH8=U
Note that the number of bumps is 300 X 300, which results in about 90,000 uAc@ Z-
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a IU7$%6<Y
manner defined by the Bezier parameterization option. Please see Chapter 5 of 56"#Syj
the LightTools Core Module User’s Guide for more information. With the fm[_@L%
x
current parameter values, the Bezier option varies the bump spacing along the VjC*(6<Gj
length of the light guide. The spacing in the orthogonal direction is constant. ? rky6
The X and Y refer to the local coordinate system of the surface. Nvi Fq
LightTools Introductory Tutorial * 91 0`V3s]%iu
@< wYT$
HAPTER 5 Introduction to Backlight Design xq# U 4E
C
{ VS''Lv
Examining Surface Properties f2 `P8$U)R
Using the methods described in previous chapters, you may want to check your 8e]z6:}'E
model before you run a simulation. ^). WW
Click on various parts of the model in the 3D Design View. Or use the System H&~5sEGa
Navigator to select different surfaces and view their Properties. U? {'n#n 5
1.In the System Navigator, click to open BottomSurface of the LightGuide, then <j{0!J@:
click Zones, and then click Texture. |= tJ|
2.Select SphericalElement, and then right-click and select Properties from the '2 w XV;`
shortcut menu. The Shape tab shows you a graphical representation of the y;zt_ O/
spherical bump shape that is the bottom of the light guide. fEx+gQW_
You might be curious as to why you cannot see the 3D texture property zones you ( Nm}3 p
defined. They are invisible by default, because drawing thousands of texture hTlnw[I
elements can make displaying and exploring the model somewhat slow. If you P'-JbPXU
choose to make them visible, 3D textures are displayed in wireframe, even if the tx2Vyu
display mode is set to translucent. Wireframe rendering displays a bit faster and [q|?f?Zl
shows more of the technical details. hO5K\QnRL
92 * LightTools Introductory Tutorial V"w`!
$&ex\_W
HAPTER 5 Introduction to Backlight Design
#;5[('&[
C IXbdS9,>F
1.Rotate and zoom the model to that you can see something like the illustration nYI/&B{p
below: 4 * Bp
. ,Wz[t YL*
2.To reveal the Property Zones: A/ 7r:yO
a.Right-click in the Design View and select View Preferences to display this >{phyByI
dialog box. Wv6z%r<
b.On the Visibility tab, click the Property Zone check box to turn it on. _fVh%_oH1
c.Click OK. l,imT$u
You will see the wire frame rendering of the spherical bumps on the I;` Ko _ i
bottom surface, and a solid color above it. The solid color is the 3D texture Q3N y5 G>
of the BEFs (brightness-enhancing films) built automatically by the utility.
