The default number of bumps is 100 (10 X 10). You need to change these _5a]pc$\Y]
parameters to match your design. Note that LightTools allows many other ';V(sRU@
placement options, but you will use the Bezier placement option for this i ]GBu
example. c 5P52_@
5.On both the X Placement tab and Y Placement tab, change the Number of i=_leC)rl
Bumps parameter to 300, as shown in the following figure. Click Apply after 7UHqiA`L
each change. $oE 4q6b
6.Click OK to close the dialog box. ^7q=E@[e
Note that the number of bumps is 300 X 300, which results in about 90,000 *pP"u::S
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a nzy =0Ox[
manner defined by the Bezier parameterization option. Please see Chapter 5 of &n<jpMB
the LightTools Core Module User’s Guide for more information. With the 5X&<+{bX
current parameter values, the Bezier option varies the bump spacing along the o! mf d}nG
length of the light guide. The spacing in the orthogonal direction is constant. :{4G= UbAI
The X and Y refer to the local coordinate system of the surface. D{o1 G?A
LightTools Introductory Tutorial * 91 v,vTRrpK
q" wi.&|
HAPTER 5 Introduction to Backlight Design mDE{s",q/
C Js+d4``W
Examining Surface Properties w|WZEu:0|
Using the methods described in previous chapters, you may want to check your
hM\QqZFyp
model before you run a simulation. ;0E"4(S.q1
Click on various parts of the model in the 3D Design View. Or use the System /iif@5lw{
Navigator to select different surfaces and view their Properties. p@i U}SUaE
1.In the System Navigator, click to open BottomSurface of the LightGuide, then VR?7 {3
click Zones, and then click Texture. f<SSg* A;
2.Select SphericalElement, and then right-click and select Properties from the {N5 g52MN
shortcut menu. The Shape tab shows you a graphical representation of the *B}vYX
spherical bump shape that is the bottom of the light guide. 'G(N,vu[@
You might be curious as to why you cannot see the 3D texture property zones you : &yRvu
defined. They are invisible by default, because drawing thousands of texture ]+0 -$t7Y
elements can make displaying and exploring the model somewhat slow. If you y NV$IN%
choose to make them visible, 3D textures are displayed in wireframe, even if the N( vbo
display mode is set to translucent. Wireframe rendering displays a bit faster and XeDU
,
shows more of the technical details. QZ{&7mc>
92 * LightTools Introductory Tutorial XyS#6D
lk.Q6saI1
HAPTER 5 Introduction to Backlight Design dMGu9k~u
C fH`1 dU
1.Rotate and zoom the model to that you can see something like the illustration k`g+
below: 1 \YX |
. n_ Um)GI>
2.To reveal the Property Zones: C,2IET
a.Right-click in the Design View and select View Preferences to display this I.x0$ac7
dialog box. vCH >Fj"7
b.On the Visibility tab, click the Property Zone check box to turn it on. 9Z *` {
c.Click OK. EoU}@MjM~
You will see the wire frame rendering of the spherical bumps on the S-2xe?sb
bottom surface, and a solid color above it. The solid color is the 3D texture w** .8]A"N
of the BEFs (brightness-enhancing films) built automatically by the utility.
