The default number of bumps is 100 (10 X 10). You need to change these ip5u_Xj ?
parameters to match your design. Note that LightTools allows many other ]]V^:"ne
placement options, but you will use the Bezier placement option for this 3Bd4
C]E
example. fle0c^ =
5.On both the X Placement tab and Y Placement tab, change the Number of ag/u8
Bumps parameter to 300, as shown in the following figure. Click Apply after 7jZrU|:yu(
each change. 'o8\`\'H!
6.Click OK to close the dialog box. )K.R\]XR
Note that the number of bumps is 300 X 300, which results in about 90,000 er\:U0fr#@
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a `]yKM0 Z
manner defined by the Bezier parameterization option. Please see Chapter 5 of `1p?*9Ssn
the LightTools Core Module User’s Guide for more information. With the # 8qyg<F
current parameter values, the Bezier option varies the bump spacing along the s#Q _Gu
length of the light guide. The spacing in the orthogonal direction is constant. WA$ p_% r=
The X and Y refer to the local coordinate system of the surface. "w1 (g=n
LightTools Introductory Tutorial * 91 hd=j56P5P
&1$8q0
HAPTER 5 Introduction to Backlight Design AuM:2N2
C fsb=8>}63}
Examining Surface Properties $U m E
Using the methods described in previous chapters, you may want to check your 1(F'~i|5
model before you run a simulation. 0eaUorm)
Click on various parts of the model in the 3D Design View. Or use the System Oylp:_<aT
Navigator to select different surfaces and view their Properties. b2%blQgo
1.In the System Navigator, click to open BottomSurface of the LightGuide, then v*gLNB,ZH
click Zones, and then click Texture. a j_:|]j
2.Select SphericalElement, and then right-click and select Properties from the .kzms
shortcut menu. The Shape tab shows you a graphical representation of the kBUufV~
spherical bump shape that is the bottom of the light guide. 8| _K
You might be curious as to why you cannot see the 3D texture property zones you o9^$hDs,si
defined. They are invisible by default, because drawing thousands of texture *kV#)j
elements can make displaying and exploring the model somewhat slow. If you bAdAp W
choose to make them visible, 3D textures are displayed in wireframe, even if the u;{T2T
display mode is set to translucent. Wireframe rendering displays a bit faster and m4\g o
shows more of the technical details. R=DPeUy;
92 * LightTools Introductory Tutorial O^D c&w
t"#lnG!G
HAPTER 5 Introduction to Backlight Design }W)Mwu'W
C v,@E}F~-f1
1.Rotate and zoom the model to that you can see something like the illustration 3# :EK
M~!
below: j!"iY tgV
. > fhSaeN
2.To reveal the Property Zones: -<12~HKK::
a.Right-click in the Design View and select View Preferences to display this CYMM*4#
dialog box. rGAFp,}-f
b.On the Visibility tab, click the Property Zone check box to turn it on. 3Y=,r!F.h
c.Click OK. sF,
uIr/
You will see the wire frame rendering of the spherical bumps on the se"um5N-
bottom surface, and a solid color above it. The solid color is the 3D texture T=O l`?5
of the BEFs (brightness-enhancing films) built automatically by the utility.
