The default number of bumps is 100 (10 X 10). You need to change these PFw "ICs
parameters to match your design. Note that LightTools allows many other JH;DVPX9z
placement options, but you will use the Bezier placement option for this iR OM?/$
example. dG$0d_Pq
5.On both the X Placement tab and Y Placement tab, change the Number of .e+UgC wi
Bumps parameter to 300, as shown in the following figure. Click Apply after /)| y+<E]}
each change. 7rg[5hP T
6.Click OK to close the dialog box. F'*&-l
Note that the number of bumps is 300 X 300, which results in about 90,000 0G 1o3[F
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a f}!26 [_9{
manner defined by the Bezier parameterization option. Please see Chapter 5 of #|i{#~gxM
the LightTools Core Module User’s Guide for more information. With the o$ k$
current parameter values, the Bezier option varies the bump spacing along the %Q~Lk]B?t
length of the light guide. The spacing in the orthogonal direction is constant. #4u; `j"4=
The X and Y refer to the local coordinate system of the surface. *p!dd?8
LightTools Introductory Tutorial * 91 \ChcJth@o<
UQ~rVUo.c
HAPTER 5 Introduction to Backlight Design [40 YoVlfM
C T I
Examining Surface Properties b1o(CG(}*
Using the methods described in previous chapters, you may want to check your k 'b|#c9c
model before you run a simulation. h`j gF
Click on various parts of the model in the 3D Design View. Or use the System PEl]HI_H
Navigator to select different surfaces and view their Properties. ,;18:
1.In the System Navigator, click to open BottomSurface of the LightGuide, then _F E F+I
click Zones, and then click Texture. xw H`alu
2.Select SphericalElement, and then right-click and select Properties from the 20)Il:x
shortcut menu. The Shape tab shows you a graphical representation of the !W7ek PnK
spherical bump shape that is the bottom of the light guide. 2[hl^f^%,
You might be curious as to why you cannot see the 3D texture property zones you 5i?U -
defined. They are invisible by default, because drawing thousands of texture I,;)pWX=@
elements can make displaying and exploring the model somewhat slow. If you kv b-=
choose to make them visible, 3D textures are displayed in wireframe, even if the |_*1/Wz@
display mode is set to translucent. Wireframe rendering displays a bit faster and O=/Tx2i;
shows more of the technical details. _C\b,D}p
92 * LightTools Introductory Tutorial }tPl?P' `
](D [T
HAPTER 5 Introduction to Backlight Design Yw<:I&
C oJ+$&P(
1.Rotate and zoom the model to that you can see something like the illustration )^+$5OR\c
below: Fu/CX4R_|
. <-pbLL 9
2.To reveal the Property Zones: NU[{oI<a
a.Right-click in the Design View and select View Preferences to display this Dn?L
dialog box. 5P!17.W'u
b.On the Visibility tab, click the Property Zone check box to turn it on. :u0433z:
c.Click OK. 6d UP's_
You will see the wire frame rendering of the spherical bumps on the ='j
bottom surface, and a solid color above it. The solid color is the 3D texture W|
p?KJk)
of the BEFs (brightness-enhancing films) built automatically by the utility.
