The default number of bumps is 100 (10 X 10). You need to change these nHl{'|~
parameters to match your design. Note that LightTools allows many other L16">,5
placement options, but you will use the Bezier placement option for this %H3
M0J2L
example. {~EPP
.
5.On both the X Placement tab and Y Placement tab, change the Number of kerBy\^
Bumps parameter to 300, as shown in the following figure. Click Apply after FQM9>l@6)>
each change. Uf#9y182*c
6.Click OK to close the dialog box. S3ZI C\2
Note that the number of bumps is 300 X 300, which results in about 90,000 }ZJ*N Y
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a c|Fu6LF a
manner defined by the Bezier parameterization option. Please see Chapter 5 of M`H@
% M
the LightTools Core Module User’s Guide for more information. With the K(rWM>Jv
current parameter values, the Bezier option varies the bump spacing along the lS/l
iI'Y
length of the light guide. The spacing in the orthogonal direction is constant. $fG~;` T
The X and Y refer to the local coordinate system of the surface. =DwY-Ex
LightTools Introductory Tutorial * 91 f}c C nJK
[ ps 5
HAPTER 5 Introduction to Backlight Design 4rUOk"li
C }NKnV3G/Z
Examining Surface Properties ]K|td)1X
Using the methods described in previous chapters, you may want to check your #sM*<2vj
model before you run a simulation. -YY@[ 5x?u
Click on various parts of the model in the 3D Design View. Or use the System gmN$}Gy}
Navigator to select different surfaces and view their Properties. nx@,oC4
1.In the System Navigator, click to open BottomSurface of the LightGuide, then ?Lbn R~/J
click Zones, and then click Texture. ;&$f~P Q
2.Select SphericalElement, and then right-click and select Properties from the d$:LUxM#
shortcut menu. The Shape tab shows you a graphical representation of the >\[| c
spherical bump shape that is the bottom of the light guide. j bp?6G W
You might be curious as to why you cannot see the 3D texture property zones you k1~? }+<e
defined. They are invisible by default, because drawing thousands of texture !7Nz_d~n
elements can make displaying and exploring the model somewhat slow. If you a([8r- zP
choose to make them visible, 3D textures are displayed in wireframe, even if the Zu|qN*N4
display mode is set to translucent. Wireframe rendering displays a bit faster and 3|=L1Pw#
shows more of the technical details. |jb,sd[=S
92 * LightTools Introductory Tutorial r*{`_G=1
s f 8F h
HAPTER 5 Introduction to Backlight Design [wn!
<#~v
C ,&G !9}EC
1.Rotate and zoom the model to that you can see something like the illustration i0 rh {Ko
below: <KFl4A~
. Y{9xF8#
2.To reveal the Property Zones: |>KOlwh5n
a.Right-click in the Design View and select View Preferences to display this ^J)0i_RS
dialog box. cFr `9A\-n
b.On the Visibility tab, click the Property Zone check box to turn it on. ~ nb1c:F
c.Click OK. gl 27&'?E*
You will see the wire frame rendering of the spherical bumps on the ^xQPj6 P}
bottom surface, and a solid color above it. The solid color is the 3D texture @4=Az 1W*
of the BEFs (brightness-enhancing films) built automatically by the utility.
