The default number of bumps is 100 (10 X 10). You need to change these R% )7z) ~
parameters to match your design. Note that LightTools allows many other {WN??ey s,
placement options, but you will use the Bezier placement option for this Xv?'*2J
example. 'L ]k \GO
5.On both the X Placement tab and Y Placement tab, change the Number of );*#s~R
Bumps parameter to 300, as shown in the following figure. Click Apply after A9ru]|?
each change. 0uS6F8x@
6.Click OK to close the dialog box. OM#eJ,MH<)
Note that the number of bumps is 300 X 300, which results in about 90,000 n]snD1?KX
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a 8aa`0X/6
manner defined by the Bezier parameterization option. Please see Chapter 5 of fz`\-"f]
the LightTools Core Module User’s Guide for more information. With the hV[=
current parameter values, the Bezier option varies the bump spacing along the btv.M
length of the light guide. The spacing in the orthogonal direction is constant. #mH4\s
The X and Y refer to the local coordinate system of the surface. Z)RV6@(
LightTools Introductory Tutorial * 91 k+y>xI,
d(;Qe}ok>
HAPTER 5 Introduction to Backlight Design +BkmI\
C LLW
xzu!<
Examining Surface Properties jt4c*0 z
Using the methods described in previous chapters, you may want to check your V"Y -|R
model before you run a simulation. !&@!:=X,
Click on various parts of the model in the 3D Design View. Or use the System VVm8bl.q
Navigator to select different surfaces and view their Properties. _.K<#S
1.In the System Navigator, click to open BottomSurface of the LightGuide, then E~'QC
click Zones, and then click Texture. ;8>
TD&]{
2.Select SphericalElement, and then right-click and select Properties from the [E4 #|w
shortcut menu. The Shape tab shows you a graphical representation of the a29 rD$
spherical bump shape that is the bottom of the light guide. &l2C-(
You might be curious as to why you cannot see the 3D texture property zones you !; COFR
defined. They are invisible by default, because drawing thousands of texture 6@cT;=W;xj
elements can make displaying and exploring the model somewhat slow. If you fv?vfI+m
choose to make them visible, 3D textures are displayed in wireframe, even if the KImazS^
display mode is set to translucent. Wireframe rendering displays a bit faster and f)%8*B
shows more of the technical details. pTIE.:g(
92 * LightTools Introductory Tutorial U8 icP+Y
i9quP"< 9
HAPTER 5 Introduction to Backlight Design %Astfn(U{4
C o%$'-N
1.Rotate and zoom the model to that you can see something like the illustration }
2P,Z 6L
below: DXc3u^
L
. _!?iiO
2.To reveal the Property Zones: Uh8c!CA8:\
a.Right-click in the Design View and select View Preferences to display this E6mwvrm8
dialog box. M3/ _E7Qoj
b.On the Visibility tab, click the Property Zone check box to turn it on. {G(N vf,K]
c.Click OK. vILq5iR
You will see the wire frame rendering of the spherical bumps on the n0< I
bottom surface, and a solid color above it. The solid color is the 3D texture Hv .n O-c
of the BEFs (brightness-enhancing films) built automatically by the utility.
