The default number of bumps is 100 (10 X 10). You need to change these YgE]d?_h
parameters to match your design. Note that LightTools allows many other < /;Q8;0
placement options, but you will use the Bezier placement option for this f^W[; w
example. ,vPe}OKj
5.On both the X Placement tab and Y Placement tab, change the Number of [3O^0-:6E
Bumps parameter to 300, as shown in the following figure. Click Apply after @br@[RpB
each change. )7&42>t
6.Click OK to close the dialog box. _ PXG AS
Note that the number of bumps is 300 X 300, which results in about 90,000 ;^R A!Nj
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a P? 9nTG
manner defined by the Bezier parameterization option. Please see Chapter 5 of $; Q$W9+
the LightTools Core Module User’s Guide for more information. With the ]2Sfkl0
current parameter values, the Bezier option varies the bump spacing along the |@ikx{ W
length of the light guide. The spacing in the orthogonal direction is constant. tg.|$n
The X and Y refer to the local coordinate system of the surface. [YC=d1F5
LightTools Introductory Tutorial * 91 zRwb"
Yim{U :F
HAPTER 5 Introduction to Backlight Design ]43al f F#
C ^)&Ly_xrU
Examining Surface Properties i 8l./Yt/
Using the methods described in previous chapters, you may want to check your
-Y*VgoK%
model before you run a simulation. j*u XB^ 4
Click on various parts of the model in the 3D Design View. Or use the System 9 YP*f
Navigator to select different surfaces and view their Properties. `J72+ RA
1.In the System Navigator, click to open BottomSurface of the LightGuide, then ?h/ x Al
click Zones, and then click Texture. 8 YNu<
2.Select SphericalElement, and then right-click and select Properties from the >(hSW~i~
shortcut menu. The Shape tab shows you a graphical representation of the Ne3R.g9;Z
spherical bump shape that is the bottom of the light guide. *_`76`cz%X
You might be curious as to why you cannot see the 3D texture property zones you A0G)imsW:_
defined. They are invisible by default, because drawing thousands of texture q5Fs )B
elements can make displaying and exploring the model somewhat slow. If you bf& }8I$
choose to make them visible, 3D textures are displayed in wireframe, even if the (2UW_l
display mode is set to translucent. Wireframe rendering displays a bit faster and L2KG0i`+
shows more of the technical details. Aj [?aL
92 * LightTools Introductory Tutorial !X^Hi=aV
{vs 4vS6
HAPTER 5 Introduction to Backlight Design c\At0.QCA
C l0I}&,+
1.Rotate and zoom the model to that you can see something like the illustration @.'z* |z
below: XMGx ^mn
. <"W?<VjO
2.To reveal the Property Zones: l
:/&E 6 9
a.Right-click in the Design View and select View Preferences to display this ~A6 "sb=
dialog box. X*i/A<Y`=
b.On the Visibility tab, click the Property Zone check box to turn it on. W+_ R hJ
c.Click OK. WzjL-a(
You will see the wire frame rendering of the spherical bumps on the >*I N
bottom surface, and a solid color above it. The solid color is the 3D texture ~
|6dH
of the BEFs (brightness-enhancing films) built automatically by the utility.
