The default number of bumps is 100 (10 X 10). You need to change these Zy ^mSI4i
parameters to match your design. Note that LightTools allows many other E< nXkqD
placement options, but you will use the Bezier placement option for this -d bD&8
example. H pXMPHd
5.On both the X Placement tab and Y Placement tab, change the Number of ?z0f5<dL
Bumps parameter to 300, as shown in the following figure. Click Apply after 2zR *`9$
each change. b3}928!D-@
6.Click OK to close the dialog box. r*]0PQ{?
Note that the number of bumps is 300 X 300, which results in about 90,000 :g v `)
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a ']^e,9=Q
manner defined by the Bezier parameterization option. Please see Chapter 5 of Ry *NR P;
the LightTools Core Module User’s Guide for more information. With the x][v d^iW
current parameter values, the Bezier option varies the bump spacing along the n's3!HQY[
length of the light guide. The spacing in the orthogonal direction is constant.
Xm`s= 5%
The X and Y refer to the local coordinate system of the surface. ]$(: :'pmK
LightTools Introductory Tutorial * 91 6dTq&GZ\
{H s" "/sb
HAPTER 5 Introduction to Backlight Design k7P~*ll$
C 6W$ #`N>
Examining Surface Properties <$Q\vCR
Using the methods described in previous chapters, you may want to check your I b.`2@ o&
model before you run a simulation. kb1{ ; c:
Click on various parts of the model in the 3D Design View. Or use the System B[7|]"L@
Navigator to select different surfaces and view their Properties. Frn#?n)S9
1.In the System Navigator, click to open BottomSurface of the LightGuide, then /G`&k{SiK
click Zones, and then click Texture. p.i$[ 6M
2.Select SphericalElement, and then right-click and select Properties from the )l *H $8
shortcut menu. The Shape tab shows you a graphical representation of the SzkF-yRd
spherical bump shape that is the bottom of the light guide. Yf Udpa0
You might be curious as to why you cannot see the 3D texture property zones you _`Ey),c _
defined. They are invisible by default, because drawing thousands of texture ?cdSZ'49[
elements can make displaying and exploring the model somewhat slow. If you ; iQ@wOL]
choose to make them visible, 3D textures are displayed in wireframe, even if the , M$*c
display mode is set to translucent. Wireframe rendering displays a bit faster and Us.yKAHP V
shows more of the technical details. [9U KVnX.V
92 * LightTools Introductory Tutorial hABC
rd Em
E (tdL,m'
HAPTER 5 Introduction to Backlight Design VA.jt}YGE
C "T 5? <c
1.Rotate and zoom the model to that you can see something like the illustration kH*l83
below: I2("p.+R
. vgOmcf%;
2.To reveal the Property Zones: ncJ}h\:Sk
a.Right-click in the Design View and select View Preferences to display this 0X+Jj/-ge
dialog box.
U, )Ng nd
b.On the Visibility tab, click the Property Zone check box to turn it on. ~!~VC)a*
c.Click OK. 8h9t8?
You will see the wire frame rendering of the spherical bumps on the _m;cX!+~_
bottom surface, and a solid color above it. The solid color is the 3D texture iQ*JU2;7 t
of the BEFs (brightness-enhancing films) built automatically by the utility.
