The default number of bumps is 100 (10 X 10). You need to change these :m=m}3/:
parameters to match your design. Note that LightTools allows many other rI$`9d
placement options, but you will use the Bezier placement option for this [mxTa\
example. 9&%fq )gS
5.On both the X Placement tab and Y Placement tab, change the Number of DQ.v+ C,
Bumps parameter to 300, as shown in the following figure. Click Apply after iyZ Z}M
each change. ek aFN\
6.Click OK to close the dialog box. NBh%:tu7M
Note that the number of bumps is 300 X 300, which results in about 90,000 ulHn#)
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a ( <t_Pru
manner defined by the Bezier parameterization option. Please see Chapter 5 of :A46~UA!$
the LightTools Core Module User’s Guide for more information. With the egR9AEJvz
current parameter values, the Bezier option varies the bump spacing along the =bh*[ , -
length of the light guide. The spacing in the orthogonal direction is constant. ;Lw{XqT
The X and Y refer to the local coordinate system of the surface. ( fD
;g9
LightTools Introductory Tutorial * 91 d &cU*
W zW-pV]
HAPTER 5 Introduction to Backlight Design O/%< }3Sq
C ~cAZB9Fa
Examining Surface Properties ! 2CL1j0(
Using the methods described in previous chapters, you may want to check your 1R LY $M
model before you run a simulation. P=L$;xgp
Click on various parts of the model in the 3D Design View. Or use the System FFhtj(hVgc
Navigator to select different surfaces and view their Properties. ;wiao(t>4N
1.In the System Navigator, click to open BottomSurface of the LightGuide, then 1PaUI#X"2F
click Zones, and then click Texture. ^da44Qqu
2.Select SphericalElement, and then right-click and select Properties from the HC {XX>F^
shortcut menu. The Shape tab shows you a graphical representation of the 6Q4X 6U:WB
spherical bump shape that is the bottom of the light guide. V{-AP=C7
You might be curious as to why you cannot see the 3D texture property zones you `"yxd lXA
defined. They are invisible by default, because drawing thousands of texture %x; x _
elements can make displaying and exploring the model somewhat slow. If you \2[<XG(^
choose to make them visible, 3D textures are displayed in wireframe, even if the pi( -A
display mode is set to translucent. Wireframe rendering displays a bit faster and 87!C@XlK_
shows more of the technical details. js^ ,(CS
92 * LightTools Introductory Tutorial A % Q!^d
[@ <sFP;g
HAPTER 5 Introduction to Backlight Design Op.8a`XLt&
C D\~zS`}
1.Rotate and zoom the model to that you can see something like the illustration 05Fz@31~
below: VO3pm6r5
. d|9b~_::V
2.To reveal the Property Zones: JE 5
a.Right-click in the Design View and select View Preferences to display this $l IWd
dialog box. H?1xjY9sl
b.On the Visibility tab, click the Property Zone check box to turn it on. v 7
c.Click OK. I-D^>\k +
You will see the wire frame rendering of the spherical bumps on the zo{/'BnU
bottom surface, and a solid color above it. The solid color is the 3D texture I:&/`K4,x,
of the BEFs (brightness-enhancing films) built automatically by the utility.
