The default number of bumps is 100 (10 X 10). You need to change these O:%s;p
5
parameters to match your design. Note that LightTools allows many other #dj by}hi
placement options, but you will use the Bezier placement option for this n x4:n@J
example. qJ(XW N H
5.On both the X Placement tab and Y Placement tab, change the Number of O{^8dwg
Bumps parameter to 300, as shown in the following figure. Click Apply after FxU a5 n
each change. $ /`X7a{
6.Click OK to close the dialog box. !=Sc po_
Note that the number of bumps is 300 X 300, which results in about 90,000 pLj[b4p9
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a 4}4 cA\B:n
manner defined by the Bezier parameterization option. Please see Chapter 5 of Q~k5 }n8
the LightTools Core Module User’s Guide for more information. With the O] _a$U*6
current parameter values, the Bezier option varies the bump spacing along the ~'1gX`o:
length of the light guide. The spacing in the orthogonal direction is constant. @*e5(@R
The X and Y refer to the local coordinate system of the surface. ]QC9y:3
LightTools Introductory Tutorial * 91 .>#X *u
>PuQ{T I
HAPTER 5 Introduction to Backlight Design %\"<lyD
C MHj
RPh
Examining Surface Properties #{_iNr a9
Using the methods described in previous chapters, you may want to check your H46N!{<;@
model before you run a simulation. U}T{r%9
Click on various parts of the model in the 3D Design View. Or use the System Upw`|$1S
Navigator to select different surfaces and view their Properties. A(eB\qG
1.In the System Navigator, click to open BottomSurface of the LightGuide, then jYU N:
click Zones, and then click Texture. e dTFk$0
2.Select SphericalElement, and then right-click and select Properties from the 9$k0
shortcut menu. The Shape tab shows you a graphical representation of the S5o,\wT
spherical bump shape that is the bottom of the light guide. uM)#T*(
You might be curious as to why you cannot see the 3D texture property zones you +>3jMs~&
defined. They are invisible by default, because drawing thousands of texture 8Sxk[`qx\K
elements can make displaying and exploring the model somewhat slow. If you CS'LW;#[
choose to make them visible, 3D textures are displayed in wireframe, even if the e&nE
display mode is set to translucent. Wireframe rendering displays a bit faster and f f&jR71E
shows more of the technical details. 'uC=xG.*}
92 * LightTools Introductory Tutorial 7F2 WmMS
fn#qcZv?
HAPTER 5 Introduction to Backlight Design N C%96gfD
C <@Z`<T6
1.Rotate and zoom the model to that you can see something like the illustration GJ5R <f9I
below: E/V_g ci
. :
&bJMzB
2.To reveal the Property Zones: \VpN:RI
a.Right-click in the Design View and select View Preferences to display this Gg e X
dialog box. S=}1k,I
b.On the Visibility tab, click the Property Zone check box to turn it on. iD*21c< kd
c.Click OK. =kTHfdin&
You will see the wire frame rendering of the spherical bumps on the 6l' J!4*qY
bottom surface, and a solid color above it. The solid color is the 3D texture dd=ca0c7e
of the BEFs (brightness-enhancing films) built automatically by the utility.
