The default number of bumps is 100 (10 X 10). You need to change these 6wjw ^m0
parameters to match your design. Note that LightTools allows many other Ww+IWW@
placement options, but you will use the Bezier placement option for this !")tU +:
example. T<Z &kYU:R
5.On both the X Placement tab and Y Placement tab, change the Number of pa E[rS\
Bumps parameter to 300, as shown in the following figure. Click Apply after E e% %d
each change. `MN4uC
6.Click OK to close the dialog box. V1 `o%;j
Note that the number of bumps is 300 X 300, which results in about 90,000 K+K#+RBK
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a Z4w!p ?Wqa
manner defined by the Bezier parameterization option. Please see Chapter 5 of ,pQZ@I\z
the LightTools Core Module User’s Guide for more information. With the $2M$?4S/T
current parameter values, the Bezier option varies the bump spacing along the +`3 )o PV)
length of the light guide. The spacing in the orthogonal direction is constant. BLf>_b Uk
The X and Y refer to the local coordinate system of the surface. V]e 8a"/[{
LightTools Introductory Tutorial * 91 Vl=l?A8
vm7z,FfN
HAPTER 5 Introduction to Backlight Design +R M SA ^
C SaAFz&WRl
Examining Surface Properties .*S#aq4S
Using the methods described in previous chapters, you may want to check your ^Hnb }L
model before you run a simulation. P90 y I
Click on various parts of the model in the 3D Design View. Or use the System 'ud{m[|
Navigator to select different surfaces and view their Properties. li'YDtMKCY
1.In the System Navigator, click to open BottomSurface of the LightGuide, then $)ij N^hV
click Zones, and then click Texture. o ! Ieb
2.Select SphericalElement, and then right-click and select Properties from the 6"5A%{ J
shortcut menu. The Shape tab shows you a graphical representation of the gpvYb7Of0
spherical bump shape that is the bottom of the light guide. *-=(Q` 3
You might be curious as to why you cannot see the 3D texture property zones you Zd}9O jz 5
defined. They are invisible by default, because drawing thousands of texture gw3K+P
elements can make displaying and exploring the model somewhat slow. If you PI:4m%[
choose to make them visible, 3D textures are displayed in wireframe, even if the .* ?wF
display mode is set to translucent. Wireframe rendering displays a bit faster and F Q7T'G![
shows more of the technical details. t?-n*9,#S
92 * LightTools Introductory Tutorial 8f)?{AX0
z2_*%S@
HAPTER 5 Introduction to Backlight Design =_ ./~
C HU8900k+
1.Rotate and zoom the model to that you can see something like the illustration ~Z?TFg
below: Vl /+;6_
. ]7F=u!/`<C
2.To reveal the Property Zones: 2~1SQ.Q<RY
a.Right-click in the Design View and select View Preferences to display this 9`A;U|~E@
dialog box. $%CF 8\0
b.On the Visibility tab, click the Property Zone check box to turn it on. $m%f wB
c.Click OK. ,c$_t+
You will see the wire frame rendering of the spherical bumps on the kHghPn?8]
bottom surface, and a solid color above it. The solid color is the 3D texture .
y-D16V
of the BEFs (brightness-enhancing films) built automatically by the utility.
