The default number of bumps is 100 (10 X 10). You need to change these 6] W=nAD
parameters to match your design. Note that LightTools allows many other | }(`kW
placement options, but you will use the Bezier placement option for this 23RN}LUi
example. 8B\2Zfe
5.On both the X Placement tab and Y Placement tab, change the Number of de p= &
Bumps parameter to 300, as shown in the following figure. Click Apply after X voo=
each change. ;[=8B \?
6.Click OK to close the dialog box. (9Ux{@$o[
Note that the number of bumps is 300 X 300, which results in about 90,000 m i,E-
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a gm igsXQ
manner defined by the Bezier parameterization option. Please see Chapter 5 of e=B|==E10M
the LightTools Core Module User’s Guide for more information. With the \=:~ki=@B
current parameter values, the Bezier option varies the bump spacing along the Y@N,qHtz
length of the light guide. The spacing in the orthogonal direction is constant. $}>+kHoT{
The X and Y refer to the local coordinate system of the surface. +trC,D
LightTools Introductory Tutorial * 91 ;" dV"W
ms*(9l.hOK
HAPTER 5 Introduction to Backlight Design $a
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C +l9!Fl{MK\
Examining Surface Properties amOnqH-(
Using the methods described in previous chapters, you may want to check your 4KIRHnaj
model before you run a simulation. nxWY7hU
Click on various parts of the model in the 3D Design View. Or use the System BD_Iz A<wK
Navigator to select different surfaces and view their Properties. g MWjk7
1.In the System Navigator, click to open BottomSurface of the LightGuide, then ^c^#dpn
click Zones, and then click Texture. BJM.iX U)[
2.Select SphericalElement, and then right-click and select Properties from the eYN5;bx)W
shortcut menu. The Shape tab shows you a graphical representation of the _AAaC_q
spherical bump shape that is the bottom of the light guide. 8FKXSqhVM
You might be curious as to why you cannot see the 3D texture property zones you [RLN;(0n
defined. They are invisible by default, because drawing thousands of texture ?[g=F <r
elements can make displaying and exploring the model somewhat slow. If you "B3N* R(["
choose to make them visible, 3D textures are displayed in wireframe, even if the !F A]
display mode is set to translucent. Wireframe rendering displays a bit faster and IsZHe lg
shows more of the technical details. Ta(Y:*Ri
92 * LightTools Introductory Tutorial Z4S!NDMm~
/&
Jan:
HAPTER 5 Introduction to Backlight Design 3I)VH MC
C _+K_5IO4
1.Rotate and zoom the model to that you can see something like the illustration pA9+Cr!0Q
below: gy#/D& N[
. Y9uC&/_C
2.To reveal the Property Zones: x=b7': nQ
a.Right-click in the Design View and select View Preferences to display this / Z~<CbKKl
dialog box. 'g C _)rK*
b.On the Visibility tab, click the Property Zone check box to turn it on. bM {s
T"
c.Click OK. x3 q]I 8q
You will see the wire frame rendering of the spherical bumps on the H *ow\
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bottom surface, and a solid color above it. The solid color is the 3D texture "D63I|O)
of the BEFs (brightness-enhancing films) built automatically by the utility.
