The default number of bumps is 100 (10 X 10). You need to change these ]VDn'@uM
parameters to match your design. Note that LightTools allows many other C99&L3bz^(
placement options, but you will use the Bezier placement option for this 7f*
RM
example. j_V/GnEQ
5.On both the X Placement tab and Y Placement tab, change the Number of {Xv3:"E"O
Bumps parameter to 300, as shown in the following figure. Click Apply after c W M:
each change. a%*_2 #
6.Click OK to close the dialog box. h7*O.Opm =
Note that the number of bumps is 300 X 300, which results in about 90,000 UKj`_a6
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a h$/JGm5uDb
manner defined by the Bezier parameterization option. Please see Chapter 5 of Yt*vqm[WV
the LightTools Core Module User’s Guide for more information. With the d- kZt@DL=
current parameter values, the Bezier option varies the bump spacing along the Pk:zfC?4
length of the light guide. The spacing in the orthogonal direction is constant. 5k~\or 5_
The X and Y refer to the local coordinate system of the surface. @ ,e8t BL
LightTools Introductory Tutorial * 91 Wc\+x1 :8
S<pk c8
HAPTER 5 Introduction to Backlight Design EBwK 7c
C cm ,4&x6
Examining Surface Properties R"{l[9j4>
Using the methods described in previous chapters, you may want to check your lRH0)5`
model before you run a simulation. [4\aYB 9N
Click on various parts of the model in the 3D Design View. Or use the System ]( nH{aY!
Navigator to select different surfaces and view their Properties. F|*tNJU>
1.In the System Navigator, click to open BottomSurface of the LightGuide, then j%WY ,2P
click Zones, and then click Texture. I=5dYq4 l
2.Select SphericalElement, and then right-click and select Properties from the --A&TV
shortcut menu. The Shape tab shows you a graphical representation of the &g
{<HU?BT
spherical bump shape that is the bottom of the light guide. 8t=3
You might be curious as to why you cannot see the 3D texture property zones you B j= @&;
defined. They are invisible by default, because drawing thousands of texture ; h9W\Se
elements can make displaying and exploring the model somewhat slow. If you )mG0g@ qOK
choose to make them visible, 3D textures are displayed in wireframe, even if the wE4;Rk1
display mode is set to translucent. Wireframe rendering displays a bit faster and T5q-" W6\
shows more of the technical details. vnZ4(
92 * LightTools Introductory Tutorial 3fl7~Lw,
0$QIfT)
HAPTER 5 Introduction to Backlight Design ? oc+ 1e
C ^}hZ'<PK
1.Rotate and zoom the model to that you can see something like the illustration OW#_ty_ul
below: SBz/VQ
. W } Zb~[,
2.To reveal the Property Zones: d EI a=e|
a.Right-click in the Design View and select View Preferences to display this a P_3C_
dialog box. ?yf_Dt
b.On the Visibility tab, click the Property Zone check box to turn it on. _jo$)x+'x
c.Click OK. <"A#Eok|4
You will see the wire frame rendering of the spherical bumps on the !?6.!2
bottom surface, and a solid color above it. The solid color is the 3D texture &1~Re.* B
of the BEFs (brightness-enhancing films) built automatically by the utility.
