The default number of bumps is 100 (10 X 10). You need to change these qk Hdr2
parameters to match your design. Note that LightTools allows many other SbrKNADH%
placement options, but you will use the Bezier placement option for this y$-;6zk\]
example. )g;*u,C
5.On both the X Placement tab and Y Placement tab, change the Number of P[Q3z$I}
Bumps parameter to 300, as shown in the following figure. Click Apply after BF >67 8h
each change. Uqs J44QEZ
6.Click OK to close the dialog box. b{X ,0a{*
Note that the number of bumps is 300 X 300, which results in about 90,000 W#^W1j>_G
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a {|:ro!&
manner defined by the Bezier parameterization option. Please see Chapter 5 of V R:4|_o
the LightTools Core Module User’s Guide for more information. With the xb6y=L
current parameter values, the Bezier option varies the bump spacing along the RQg7vv]%
length of the light guide. The spacing in the orthogonal direction is constant. $eqwn&$n
The X and Y refer to the local coordinate system of the surface. y+jOk6)W75
LightTools Introductory Tutorial * 91 qpjG_G5/
s1"dd7&g'
HAPTER 5 Introduction to Backlight Design SLGo/I*
C ~6bf-Wg'X
Examining Surface Properties yxz)32B?
Using the methods described in previous chapters, you may want to check your <d`ksZ+
model before you run a simulation. IZw> !KYG
Click on various parts of the model in the 3D Design View. Or use the System ',>Pz+XKc
Navigator to select different surfaces and view their Properties. Qg^Ga0Lf6
1.In the System Navigator, click to open BottomSurface of the LightGuide, then o= %pR|
click Zones, and then click Texture.
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2.Select SphericalElement, and then right-click and select Properties from the l:'\3-2a
shortcut menu. The Shape tab shows you a graphical representation of the on0MhW
spherical bump shape that is the bottom of the light guide. 4 C7z6VWg
You might be curious as to why you cannot see the 3D texture property zones you m@A ?'gD
defined. They are invisible by default, because drawing thousands of texture JJE 3 \
elements can make displaying and exploring the model somewhat slow. If you P84uEDY
choose to make them visible, 3D textures are displayed in wireframe, even if the 8Pgw_ 21N1
display mode is set to translucent. Wireframe rendering displays a bit faster and BNj@~u C{
shows more of the technical details. ZjB]pG+
92 * LightTools Introductory Tutorial R}T8cVxc
Of@ LEEh6
HAPTER 5 Introduction to Backlight Design }I )%G w
C /RF= 8,A
1.Rotate and zoom the model to that you can see something like the illustration I=;.o>
below: Q)lN7oD
. ].(l^W
2.To reveal the Property Zones: gS
VWv9+
a.Right-click in the Design View and select View Preferences to display this IGKtugU%
dialog box. :" im2J
b.On the Visibility tab, click the Property Zone check box to turn it on. PKxI0 9B
c.Click OK. #uc9eh}CWO
You will see the wire frame rendering of the spherical bumps on the 8c%Sd'+Pt
bottom surface, and a solid color above it. The solid color is the 3D texture O3*}L2 j@
of the BEFs (brightness-enhancing films) built automatically by the utility.
