The default number of bumps is 100 (10 X 10). You need to change these ;~-M$a
}4
parameters to match your design. Note that LightTools allows many other *X l,w2@
placement options, but you will use the Bezier placement option for this sR;u#" .
example. } /*U~!t
5.On both the X Placement tab and Y Placement tab, change the Number of b_Dd$NC
Bumps parameter to 300, as shown in the following figure. Click Apply after ?egZkg=U
each change. A/!"+Yfw
6.Click OK to close the dialog box. He*c=^8k
Note that the number of bumps is 300 X 300, which results in about 90,000 5@_kG oqd
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a xi[\2g+
manner defined by the Bezier parameterization option. Please see Chapter 5 of YkSHJ{ >
the LightTools Core Module User’s Guide for more information. With the RXRoMg!-P
current parameter values, the Bezier option varies the bump spacing along the u*$]B x
length of the light guide. The spacing in the orthogonal direction is constant. K$KVm^`
The X and Y refer to the local coordinate system of the surface. 722:2 {
LightTools Introductory Tutorial * 91 LYO2L1u)
x|$|~ 6f=n
HAPTER 5 Introduction to Backlight Design kRqe&N e
C +~$pkxD"
Examining Surface Properties C 7Fx V2
Using the methods described in previous chapters, you may want to check your $.x,[R
aN
model before you run a simulation. |B
{*so ]
Click on various parts of the model in the 3D Design View. Or use the System :i>If:>g
Navigator to select different surfaces and view their Properties. w+u1 "
1.In the System Navigator, click to open BottomSurface of the LightGuide, then N/78Ub
click Zones, and then click Texture. L+8{%\UPd
2.Select SphericalElement, and then right-click and select Properties from the SQ DfDrYP
shortcut menu. The Shape tab shows you a graphical representation of the Rga
*68s|&
spherical bump shape that is the bottom of the light guide. \ V#fl
You might be curious as to why you cannot see the 3D texture property zones you &%` WXe-`R
defined. They are invisible by default, because drawing thousands of texture ly#jl5wmT
elements can make displaying and exploring the model somewhat slow. If you ;;|.qgxc~
choose to make them visible, 3D textures are displayed in wireframe, even if the C6'K)P[p
display mode is set to translucent. Wireframe rendering displays a bit faster and %-woaj
shows more of the technical details. 1:!H`*DU&
92 * LightTools Introductory Tutorial MK(~
[\qclW;L
HAPTER 5 Introduction to Backlight Design tb4^+&.GS
C
e jc>
1.Rotate and zoom the model to that you can see something like the illustration )=VAEQhL-
below: hp`ZmLq/[
. 82iFk`)T
2.To reveal the Property Zones: [1nUq!uTm
a.Right-click in the Design View and select View Preferences to display this l b;P&V
dialog box. qKr xln/T
b.On the Visibility tab, click the Property Zone check box to turn it on. [RF 6mWQ
c.Click OK. g`C\pd X"B
You will see the wire frame rendering of the spherical bumps on the 6qSsr]
bottom surface, and a solid color above it. The solid color is the 3D texture Lg~ll$
U
of the BEFs (brightness-enhancing films) built automatically by the utility.
