The default number of bumps is 100 (10 X 10). You need to change these !4 4mT'Y
parameters to match your design. Note that LightTools allows many other k67i` f=
placement options, but you will use the Bezier placement option for this ?HEtr X,q
example. i^yH?bH @~
5.On both the X Placement tab and Y Placement tab, change the Number of gf3u0' $
Bumps parameter to 300, as shown in the following figure. Click Apply after +9 16ZPk
each change. liugaRO8J
6.Click OK to close the dialog box. "9U+h2#]
Note that the number of bumps is 300 X 300, which results in about 90,000 eHR &N.2
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a BYr_Lz|T
manner defined by the Bezier parameterization option. Please see Chapter 5 of *@ <8&M9x
the LightTools Core Module User’s Guide for more information. With the V`R)#G>IH%
current parameter values, the Bezier option varies the bump spacing along the z,}c?BP
length of the light guide. The spacing in the orthogonal direction is constant. x ^M5D+o
The X and Y refer to the local coordinate system of the surface. ?O<`h~'$+
LightTools Introductory Tutorial * 91 RWh9&O:6'
oRT
HAPTER 5 Introduction to Backlight Design _A;vSp.`
C IFC%%I t5,
Examining Surface Properties y(/jTS/ hd
Using the methods described in previous chapters, you may want to check your Y-Ziyy
model before you run a simulation. [D<RV3 x9
Click on various parts of the model in the 3D Design View. Or use the System Giy3eva2
Navigator to select different surfaces and view their Properties. ]/ZA/: Oa+
1.In the System Navigator, click to open BottomSurface of the LightGuide, then $tDCS
click Zones, and then click Texture. cotxo?)Zv
2.Select SphericalElement, and then right-click and select Properties from the B&4fYpn
shortcut menu. The Shape tab shows you a graphical representation of the B91S
h`
spherical bump shape that is the bottom of the light guide. P S _3Oq)
You might be curious as to why you cannot see the 3D texture property zones you %jbJ6c
defined. They are invisible by default, because drawing thousands of texture ;PfeP ;z
elements can make displaying and exploring the model somewhat slow. If you "4Lg8q m
choose to make them visible, 3D textures are displayed in wireframe, even if the Wz6]*P`qv
display mode is set to translucent. Wireframe rendering displays a bit faster and ;xW8Z<\-
shows more of the technical details. :"OZc7
~
92 * LightTools Introductory Tutorial mHK@(D7X
0v_6cYA
HAPTER 5 Introduction to Backlight Design njy~
C ot|N;=ZKo
1.Rotate and zoom the model to that you can see something like the illustration Xk {!' 0
below: y'J:?!S,Yu
. iX8h2l
2.To reveal the Property Zones: L\/u}]dPQ
a.Right-click in the Design View and select View Preferences to display this h .4qlx|
dialog box. 'h!h!
b.On the Visibility tab, click the Property Zone check box to turn it on. Hk <X
c.Click OK. + > T7Q`64
You will see the wire frame rendering of the spherical bumps on the Ij;==f~G
bottom surface, and a solid color above it. The solid color is the 3D texture itqQ)\W
of the BEFs (brightness-enhancing films) built automatically by the utility.
