The default number of bumps is 100 (10 X 10). You need to change these :
m)
parameters to match your design. Note that LightTools allows many other ub7z A!%
placement options, but you will use the Bezier placement option for this DKfE.p)
example. *"WD b|PBb
5.On both the X Placement tab and Y Placement tab, change the Number of H(2!1 ?N +
Bumps parameter to 300, as shown in the following figure. Click Apply after | _}2f
each change. Kh(ZU^{n
6.Click OK to close the dialog box. 7~9S 9
Note that the number of bumps is 300 X 300, which results in about 90,000 bgS$ {n/
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a e2z h&j
manner defined by the Bezier parameterization option. Please see Chapter 5 of %R z&lh/
the LightTools Core Module User’s Guide for more information. With the /D5`
current parameter values, the Bezier option varies the bump spacing along the 3k|oK'l
length of the light guide. The spacing in the orthogonal direction is constant. +z u(
The X and Y refer to the local coordinate system of the surface. <cZGxff01
LightTools Introductory Tutorial * 91 0E?jW7yr
#
S}Z8
HAPTER 5 Introduction to Backlight Design O@MGda9_;
C vy_D>tp
Examining Surface Properties ET _W-
Using the methods described in previous chapters, you may want to check your bKj%s@ x
model before you run a simulation. %@;6^=
Click on various parts of the model in the 3D Design View. Or use the System I/M _p^
Navigator to select different surfaces and view their Properties. s"9`s_p`d
1.In the System Navigator, click to open BottomSurface of the LightGuide, then Y7#-Fra0W
click Zones, and then click Texture. O:TlIJwW
2.Select SphericalElement, and then right-click and select Properties from the |fxA|/ s[<
shortcut menu. The Shape tab shows you a graphical representation of the umF
Z?a
spherical bump shape that is the bottom of the light guide. ~ zil/P8
You might be curious as to why you cannot see the 3D texture property zones you 5nTY ?<x`k
defined. They are invisible by default, because drawing thousands of texture w^L ta
elements can make displaying and exploring the model somewhat slow. If you &Zgh Mq ~
choose to make them visible, 3D textures are displayed in wireframe, even if the "VkTY|a
display mode is set to translucent. Wireframe rendering displays a bit faster and KBX K0zWh7
shows more of the technical details. pWPIJ>2G:
92 * LightTools Introductory Tutorial Ct2j ZqCDo
zUkN 0
HAPTER 5 Introduction to Backlight Design !>BZ6gn5
C t <T[h2Wd
1.Rotate and zoom the model to that you can see something like the illustration U7!.,k R-
below: S!Omy:=;i
. 2-=\~<)
2.To reveal the Property Zones: 'xhcuVl
a.Right-click in the Design View and select View Preferences to display this CM<]ZG7
dialog box. $&$w Y/F
b.On the Visibility tab, click the Property Zone check box to turn it on. i<H wTmm$
c.Click OK. |+3 5y_i6
You will see the wire frame rendering of the spherical bumps on the 0dA7pY9
bottom surface, and a solid color above it. The solid color is the 3D texture &;XAuDw4+i
of the BEFs (brightness-enhancing films) built automatically by the utility.
