The default number of bumps is 100 (10 X 10). You need to change these '2Mjz6mBDA
parameters to match your design. Note that LightTools allows many other w%%6[<3%
placement options, but you will use the Bezier placement option for this S&;T_^|
example. RPofa+
5.On both the X Placement tab and Y Placement tab, change the Number of UeutFNp
Bumps parameter to 300, as shown in the following figure. Click Apply after 6:SK{RSURC
each change. Q>06dO~z8
6.Click OK to close the dialog box. /\oyPD`((
Note that the number of bumps is 300 X 300, which results in about 90,000 3N) Ycf8
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a K{eqB! @j
manner defined by the Bezier parameterization option. Please see Chapter 5 of y^0HCp{
the LightTools Core Module User’s Guide for more information. With the v '"1/% L
current parameter values, the Bezier option varies the bump spacing along the 5yO#N2jY\
length of the light guide. The spacing in the orthogonal direction is constant. T<9 dW?'|
The X and Y refer to the local coordinate system of the surface. u(TgWp5WF
LightTools Introductory Tutorial * 91 cP$wI;P
wh7i
G8jCz
HAPTER 5 Introduction to Backlight Design dvrvp DoE.
C Lv`8jSt\
Examining Surface Properties 4jq`No_
Using the methods described in previous chapters, you may want to check your %nG ~u,_2f
model before you run a simulation. '>S 8t/
Click on various parts of the model in the 3D Design View. Or use the System Q
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Navigator to select different surfaces and view their Properties. TA-(_jm
1.In the System Navigator, click to open BottomSurface of the LightGuide, then TV[6+i*#
click Zones, and then click Texture.
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2.Select SphericalElement, and then right-click and select Properties from the 2s]]!{Z#
shortcut menu. The Shape tab shows you a graphical representation of the *h5ld P
spherical bump shape that is the bottom of the light guide. !`d832
You might be curious as to why you cannot see the 3D texture property zones you inq 4CGY
defined. They are invisible by default, because drawing thousands of texture nEZ-h7lzl(
elements can make displaying and exploring the model somewhat slow. If you /o}0oo5B
choose to make them visible, 3D textures are displayed in wireframe, even if the /4f 5s#hR
display mode is set to translucent. Wireframe rendering displays a bit faster and NL>[8#
shows more of the technical details. w;h\Y+Myyk
92 * LightTools Introductory Tutorial ><:lUt*N2
*BP\6"X
HAPTER 5 Introduction to Backlight Design -h^} jP8
C E-7a `S
1.Rotate and zoom the model to that you can see something like the illustration jmZ|b6
below: >8Yrmq
. \CEnOq
2.To reveal the Property Zones: Pv b+
a.Right-click in the Design View and select View Preferences to display this eA~_)-Z-
dialog box. (Db*.kd8,
b.On the Visibility tab, click the Property Zone check box to turn it on. tp,mw24
c.Click OK. STF}~`b:3
You will see the wire frame rendering of the spherical bumps on the A= YEY n
bottom surface, and a solid color above it. The solid color is the 3D texture Vg C9' "|
of the BEFs (brightness-enhancing films) built automatically by the utility.
