The default number of bumps is 100 (10 X 10). You need to change these 9?T{}| ?
parameters to match your design. Note that LightTools allows many other ~vdkFc(8B
placement options, but you will use the Bezier placement option for this ~q +[<x R\
example. VxO%rq3
5.On both the X Placement tab and Y Placement tab, change the Number of .4.pJbOg
Bumps parameter to 300, as shown in the following figure. Click Apply after cF T 9Lnz
each change. $WQq? 1.9
6.Click OK to close the dialog box. !hxIlVd{
Note that the number of bumps is 300 X 300, which results in about 90,000 E9! N >0
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a 9X<OJT;3J
manner defined by the Bezier parameterization option. Please see Chapter 5 of 2i #Sn' 1
the LightTools Core Module User’s Guide for more information. With the G`=r^$.3WB
current parameter values, the Bezier option varies the bump spacing along the w>? Un,K
length of the light guide. The spacing in the orthogonal direction is constant. 0\{BWNK
The X and Y refer to the local coordinate system of the surface. "](6lB1Oe
LightTools Introductory Tutorial * 91 >ndJNinV
Wk;5/
HAPTER 5 Introduction to Backlight Design OvL\u{(<F
C BG2)v.CU
Examining Surface Properties =wu*D5
Using the methods described in previous chapters, you may want to check your R614#yn-+
model before you run a simulation. :bU(S<%M
Click on various parts of the model in the 3D Design View. Or use the System 6` 01EIk
Navigator to select different surfaces and view their Properties. }peBR80tQ
1.In the System Navigator, click to open BottomSurface of the LightGuide, then /x@RNd Kv
click Zones, and then click Texture. f6<g3Q7Mu
2.Select SphericalElement, and then right-click and select Properties from the jD,Baz<
shortcut menu. The Shape tab shows you a graphical representation of the DLPUqKL]
spherical bump shape that is the bottom of the light guide. 7J$b$P0}
You might be curious as to why you cannot see the 3D texture property zones you I~eSZ?$s#
defined. They are invisible by default, because drawing thousands of texture Z5G!ct:W
elements can make displaying and exploring the model somewhat slow. If you j|.} I
choose to make them visible, 3D textures are displayed in wireframe, even if the u9-nt}hGYM
display mode is set to translucent. Wireframe rendering displays a bit faster and z;u>
Yz+3
shows more of the technical details. DLE8+NV8
92 * LightTools Introductory Tutorial -l+P8:fL~
%n0;[sD0A
HAPTER 5 Introduction to Backlight Design J a, d3K
C 5R MS(
1.Rotate and zoom the model to that you can see something like the illustration }b3/b
below: lw%?z/HDf
. [}mA`5
2.To reveal the Property Zones: 6Q|k7*,B
a.Right-click in the Design View and select View Preferences to display this
ye 6H*K
dialog box. OqhD7 +
b.On the Visibility tab, click the Property Zone check box to turn it on. @# P0M--X
c.Click OK. XP[uF ;w
You will see the wire frame rendering of the spherical bumps on the s3s4OAY
bottom surface, and a solid color above it. The solid color is the 3D texture \79X{mcd
of the BEFs (brightness-enhancing films) built automatically by the utility.
