The default number of bumps is 100 (10 X 10). You need to change these Vv2{^ !aZ
parameters to match your design. Note that LightTools allows many other U-1VnX9m
placement options, but you will use the Bezier placement option for this a" ^#!G<+
example. dA|Lufy#
5.On both the X Placement tab and Y Placement tab, change the Number of u*U_7Uw$
Bumps parameter to 300, as shown in the following figure. Click Apply after LH,]vuXh
each change. ,T/GW,?
6.Click OK to close the dialog box. "2%y~jrDN
Note that the number of bumps is 300 X 300, which results in about 90,000 r)c+".0d^
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a {[my"n 2
manner defined by the Bezier parameterization option. Please see Chapter 5 of XNKtL]U}$
the LightTools Core Module User’s Guide for more information. With the tI"w Vr
current parameter values, the Bezier option varies the bump spacing along the u/;_?zI
length of the light guide. The spacing in the orthogonal direction is constant. 48H5_9>:
The X and Y refer to the local coordinate system of the surface. ]&' jP
LightTools Introductory Tutorial * 91 ^4RO
LgO i3
HAPTER 5 Introduction to Backlight Design vNPfUEn A
C Z(l 9>A7!
Examining Surface Properties H ]VsOr
Using the methods described in previous chapters, you may want to check your 8?A@/
model before you run a simulation. i[o& z$JO
Click on various parts of the model in the 3D Design View. Or use the System $^]
9
Navigator to select different surfaces and view their Properties. =kwb`
Z/a
1.In the System Navigator, click to open BottomSurface of the LightGuide, then >c}:
click Zones, and then click Texture. qwL 0~I
2.Select SphericalElement, and then right-click and select Properties from the V[4(~,9
shortcut menu. The Shape tab shows you a graphical representation of the x`Vy<h 33
spherical bump shape that is the bottom of the light guide. l#tS.+B7
You might be curious as to why you cannot see the 3D texture property zones you 5<!o{)I
defined. They are invisible by default, because drawing thousands of texture /]pX8
d
elements can make displaying and exploring the model somewhat slow. If you RA#\ x.
choose to make them visible, 3D textures are displayed in wireframe, even if the 'uws
display mode is set to translucent. Wireframe rendering displays a bit faster and 9)#gtD M%J
shows more of the technical details. 7ytm .lU
92 * LightTools Introductory Tutorial Xs{/}wc.q;
3 7J\i ]
HAPTER 5 Introduction to Backlight Design N9`y,Cos0
C mipi]*ZfXE
1.Rotate and zoom the model to that you can see something like the illustration A$%@fO.b
below: GTT 5<diw
. xWd9%,mDNR
2.To reveal the Property Zones: (r.$%[,.<
a.Right-click in the Design View and select View Preferences to display this 58M'r{8_
dialog box. (PRaiE
b.On the Visibility tab, click the Property Zone check box to turn it on. 9` OG
c.Click OK. sx<}
tbG
You will see the wire frame rendering of the spherical bumps on the 1-4
bottom surface, and a solid color above it. The solid color is the 3D texture rdORNlK&
of the BEFs (brightness-enhancing films) built automatically by the utility.
