The default number of bumps is 100 (10 X 10). You need to change these S<V_ _ Sv
parameters to match your design. Note that LightTools allows many other aj<=]=hr
placement options, but you will use the Bezier placement option for this \#; -C< [b
example. "'
hc)58y
5.On both the X Placement tab and Y Placement tab, change the Number of :D'#CoBA
Bumps parameter to 300, as shown in the following figure. Click Apply after E)dV;1t
each change. h[0,/`qb{
6.Click OK to close the dialog box. F! ;0eS"xp
Note that the number of bumps is 300 X 300, which results in about 90,000 ~rX2oLw{&
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a -Vi"hSsUP
manner defined by the Bezier parameterization option. Please see Chapter 5 of /U#{6zeM[,
the LightTools Core Module User’s Guide for more information. With the n)7olP0p
current parameter values, the Bezier option varies the bump spacing along the w3=Bj
length of the light guide. The spacing in the orthogonal direction is constant. 9\]%N;;Lo
The X and Y refer to the local coordinate system of the surface. OyG$ ]C
LightTools Introductory Tutorial * 91 .iB ?:
)TBG-<wt
HAPTER 5 Introduction to Backlight Design D{aN_0mT
C 8U07]=Bt<
Examining Surface Properties pGy(JvMw"
Using the methods described in previous chapters, you may want to check your @,63%
model before you run a simulation. D+.h *{gD
Click on various parts of the model in the 3D Design View. Or use the System U >z8gdzu
Navigator to select different surfaces and view their Properties. "s]c79t
1.In the System Navigator, click to open BottomSurface of the LightGuide, then rI5)w_E?
click Zones, and then click Texture. \Om<
FH}
2.Select SphericalElement, and then right-click and select Properties from the I
=t{ u;
shortcut menu. The Shape tab shows you a graphical representation of the ': f q
spherical bump shape that is the bottom of the light guide. $:%?-xy(
You might be curious as to why you cannot see the 3D texture property zones you + (cTzY
defined. They are invisible by default, because drawing thousands of texture ~5HI9A4^
elements can make displaying and exploring the model somewhat slow. If you k@eU #c5c
choose to make them visible, 3D textures are displayed in wireframe, even if the M lp[xk|
display mode is set to translucent. Wireframe rendering displays a bit faster and tIgKnKr^)
shows more of the technical details. Z%Nl<i
92 * LightTools Introductory Tutorial mACj>0Z'
O7shY4 Sr
HAPTER 5 Introduction to Backlight Design a r#p7N
C @L8('8~d
1.Rotate and zoom the model to that you can see something like the illustration 9tVA.:FOZ
below: LX e {
. K
YFumR
2.To reveal the Property Zones: ;wfzlUBC
a.Right-click in the Design View and select View Preferences to display this Z4Nl{
6
dialog box. -i@1sNx&'
b.On the Visibility tab, click the Property Zone check box to turn it on. \k1psqw^O
c.Click OK. "qRE1j@%a
You will see the wire frame rendering of the spherical bumps on the $-$^r;
bottom surface, and a solid color above it. The solid color is the 3D texture xV'\2n=1T
of the BEFs (brightness-enhancing films) built automatically by the utility.
