The default number of bumps is 100 (10 X 10). You need to change these 9`B0fv Q&
parameters to match your design. Note that LightTools allows many other ~\$=w10
placement options, but you will use the Bezier placement option for this RlrZxmPV>O
example. 6B#('gxO
5.On both the X Placement tab and Y Placement tab, change the Number of )u;JwFstX
Bumps parameter to 300, as shown in the following figure. Click Apply after a9=> r
each change. Bz+.Qa+
6.Click OK to close the dialog box. ahA{B1M)n
Note that the number of bumps is 300 X 300, which results in about 90,000 abBO93f^
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a 3cqQL!Gm
manner defined by the Bezier parameterization option. Please see Chapter 5 of eIg+PuQD]
the LightTools Core Module User’s Guide for more information. With the OUzR@$
current parameter values, the Bezier option varies the bump spacing along the bpW!iY/q3
length of the light guide. The spacing in the orthogonal direction is constant. 0x@A~!MoP
The X and Y refer to the local coordinate system of the surface. Q&xjF@I
LightTools Introductory Tutorial * 91 86%%n?"}
Ry z?v<)h
HAPTER 5 Introduction to Backlight Design `?| Rc
C :\b|dvI <
Examining Surface Properties rfs (#
Using the methods described in previous chapters, you may want to check your :?=Q39O9
model before you run a simulation. |O-`5_z$r
Click on various parts of the model in the 3D Design View. Or use the System o'Wz*oY))\
Navigator to select different surfaces and view their Properties. Stxp3\j En
1.In the System Navigator, click to open BottomSurface of the LightGuide, then =q+R
click Zones, and then click Texture. BFWi(5 8q
2.Select SphericalElement, and then right-click and select Properties from the wiJRCH
shortcut menu. The Shape tab shows you a graphical representation of the Vr/Bu4V"
spherical bump shape that is the bottom of the light guide. _({@B`N}
You might be curious as to why you cannot see the 3D texture property zones you ZQAO"huk]
defined. They are invisible by default, because drawing thousands of texture
R_1 qn
elements can make displaying and exploring the model somewhat slow. If you H_w%'v &
choose to make them visible, 3D textures are displayed in wireframe, even if the <~{du ?4n
display mode is set to translucent. Wireframe rendering displays a bit faster and SO;N~D1Z6
shows more of the technical details. #6=MKpR
92 * LightTools Introductory Tutorial NQX>Qh
2
sWHyL(C@
HAPTER 5 Introduction to Backlight Design qs I^oBD"
C p|3b/plZ
1.Rotate and zoom the model to that you can see something like the illustration h/2/vBs
below: I{ ryD -!
.
N F+<#*1
2.To reveal the Property Zones: r\2vl8X~
a.Right-click in the Design View and select View Preferences to display this "uKFOV?j&
dialog box. sN~ \+_
b.On the Visibility tab, click the Property Zone check box to turn it on. [A5W+pDm
c.Click OK. kz B\'m,l
You will see the wire frame rendering of the spherical bumps on the '\"G{jU@
bottom surface, and a solid color above it. The solid color is the 3D texture gC uAF$o
of the BEFs (brightness-enhancing films) built automatically by the utility.
