The default number of bumps is 100 (10 X 10). You need to change these @6UZC-M 0
parameters to match your design. Note that LightTools allows many other <<E 9MIn_
placement options, but you will use the Bezier placement option for this QxGcRlpLK
example. __FEdO
5.On both the X Placement tab and Y Placement tab, change the Number of NdSuOkwwt
Bumps parameter to 300, as shown in the following figure. Click Apply after EpyMc+.Ze'
each change. kP^A ~ZO.
6.Click OK to close the dialog box. Mp>(cs
Note that the number of bumps is 300 X 300, which results in about 90,000 kd\Hj~ *
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a CaO-aL
manner defined by the Bezier parameterization option. Please see Chapter 5 of 02trjp.f
the LightTools Core Module User’s Guide for more information. With the 5%e+@X;j
current parameter values, the Bezier option varies the bump spacing along the 4OQ,|Wm4G
length of the light guide. The spacing in the orthogonal direction is constant. z7g X@@T
The X and Y refer to the local coordinate system of the surface. g}W|q"l?i
LightTools Introductory Tutorial * 91 "om7 : d
^3S&LC
1;|
HAPTER 5 Introduction to Backlight Design t|i<}2
C {>9ED.t
Examining Surface Properties jl&Nph p
Using the methods described in previous chapters, you may want to check your rQ_@ q_B .
model before you run a simulation. Cl9 nmyf
Click on various parts of the model in the 3D Design View. Or use the System n*A1x8tn
Navigator to select different surfaces and view their Properties. KR%WBvv
1.In the System Navigator, click to open BottomSurface of the LightGuide, then Bt(<Xj D
click Zones, and then click Texture. Iz#4!E|<
2.Select SphericalElement, and then right-click and select Properties from the : ?BK A0E
shortcut menu. The Shape tab shows you a graphical representation of the /e?0Iv"
8>
spherical bump shape that is the bottom of the light guide. +kQ=2dva
You might be curious as to why you cannot see the 3D texture property zones you jBOl:l,+
defined. They are invisible by default, because drawing thousands of texture (.V),NKG
elements can make displaying and exploring the model somewhat slow. If you jVQ89 vf
~
choose to make them visible, 3D textures are displayed in wireframe, even if the @sA !o[gH
display mode is set to translucent. Wireframe rendering displays a bit faster and rzn,N FI
shows more of the technical details. i!e8-gVMP&
92 * LightTools Introductory Tutorial UO@K:n
O>1Cx4s5
HAPTER 5 Introduction to Backlight Design (IVhj^dQm
C AH5;6Q
1.Rotate and zoom the model to that you can see something like the illustration ^Y%_{
below: M3O !jN~
. RK &>! ^
2.To reveal the Property Zones: vno/V#e$WX
a.Right-click in the Design View and select View Preferences to display this O^row1D_
dialog box. rf:H$\yw
b.On the Visibility tab, click the Property Zone check box to turn it on. B 5|\<CF
c.Click OK. JHvev,#4
You will see the wire frame rendering of the spherical bumps on the cP Nc$^Y
bottom surface, and a solid color above it. The solid color is the 3D texture [K\b"^=<
of the BEFs (brightness-enhancing films) built automatically by the utility.
