The default number of bumps is 100 (10 X 10). You need to change these O/ 5W-u
parameters to match your design. Note that LightTools allows many other o3`Z@-.G
placement options, but you will use the Bezier placement option for this EZ=M^0=Hpf
example. Oc8+an1m
5.On both the X Placement tab and Y Placement tab, change the Number of 3b_#xr-
Bumps parameter to 300, as shown in the following figure. Click Apply after R Ofm Ac
each change. 1n5& PN u
6.Click OK to close the dialog box. C= Zuy^
Note that the number of bumps is 300 X 300, which results in about 90,000 kiECJ@5p
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a k P| !!N
manner defined by the Bezier parameterization option. Please see Chapter 5 of 5<S1 ,u5
the LightTools Core Module User’s Guide for more information. With the }cf-r>WaR
current parameter values, the Bezier option varies the bump spacing along the Cz(Pj S
length of the light guide. The spacing in the orthogonal direction is constant. E x Qld
The X and Y refer to the local coordinate system of the surface. Sj*H4ZHD<&
LightTools Introductory Tutorial * 91 h(zi$V
,iHt*SZ,*
HAPTER 5 Introduction to Backlight Design $M><K
C %W c-.E R
Examining Surface Properties xNONf4I:6J
Using the methods described in previous chapters, you may want to check your Vt&I[osC
model before you run a simulation. K;Xn!:) V:
Click on various parts of the model in the 3D Design View. Or use the System WRnUF [y+)
Navigator to select different surfaces and view their Properties. k{;:KW|
1.In the System Navigator, click to open BottomSurface of the LightGuide, then 71 2i |
click Zones, and then click Texture. kxO$Uk&TX
2.Select SphericalElement, and then right-click and select Properties from the DnTM#i :
shortcut menu. The Shape tab shows you a graphical representation of the PF+`3
spherical bump shape that is the bottom of the light guide. |[V( u
You might be curious as to why you cannot see the 3D texture property zones you IEA[]eik>
defined. They are invisible by default, because drawing thousands of texture n[clYi@e
elements can make displaying and exploring the model somewhat slow. If you ^.4<#Qs
choose to make them visible, 3D textures are displayed in wireframe, even if the u|Ai<2b$
display mode is set to translucent. Wireframe rendering displays a bit faster and [IYs4Y5
shows more of the technical details. Xu
T|vh
92 * LightTools Introductory Tutorial {<i!Pm
hIw*do b
HAPTER 5 Introduction to Backlight Design 6-^+btl)#
C (O&b:D/Y
1.Rotate and zoom the model to that you can see something like the illustration QR#,n@fE
below: ;x RyONt
. . = NK^
2.To reveal the Property Zones: c]O4l2nCL
a.Right-click in the Design View and select View Preferences to display this XR +2|o
dialog box. ~jP e9
b.On the Visibility tab, click the Property Zone check box to turn it on. _Ih~'Y Fd
c.Click OK. .c',?[S/vH
You will see the wire frame rendering of the spherical bumps on the 8=?I/9Xh
bottom surface, and a solid color above it. The solid color is the 3D texture HS2)vd@)
of the BEFs (brightness-enhancing films) built automatically by the utility.
