The default number of bumps is 100 (10 X 10). You need to change these d?=r:TBU
parameters to match your design. Note that LightTools allows many other \2)~dV:6+
placement options, but you will use the Bezier placement option for this _Ns_$_
example. AJt4I
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5.On both the X Placement tab and Y Placement tab, change the Number of ks<+gL{K|i
Bumps parameter to 300, as shown in the following figure. Click Apply after =OooTZb:x-
each change. 7]8apei|
6.Click OK to close the dialog box. Br"K{ g?
Note that the number of bumps is 300 X 300, which results in about 90,000 B et?]4\_
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a wmFS+F4`2
manner defined by the Bezier parameterization option. Please see Chapter 5 of /3 d 6 Og
the LightTools Core Module User’s Guide for more information. With the S{qsq\X
current parameter values, the Bezier option varies the bump spacing along the 9 H~OC8R:
length of the light guide. The spacing in the orthogonal direction is constant. `qj24ehc
The X and Y refer to the local coordinate system of the surface. fMRMQR=6B
LightTools Introductory Tutorial * 91 mvGj
!'
4G=KyRKh
HAPTER 5 Introduction to Backlight Design 'V:ah3 8
C )dI `yf
Examining Surface Properties XE : JL_
Using the methods described in previous chapters, you may want to check your hdxq@%Vs
model before you run a simulation. x5W.
3*
Click on various parts of the model in the 3D Design View. Or use the System o$,e#q)8
Navigator to select different surfaces and view their Properties. =7<g;u
1.In the System Navigator, click to open BottomSurface of the LightGuide, then YW^sf,z Q
click Zones, and then click Texture. }e&Z"H |
2.Select SphericalElement, and then right-click and select Properties from the hx sW9
shortcut menu. The Shape tab shows you a graphical representation of the + Scw;gO
spherical bump shape that is the bottom of the light guide. X h"8uJD
You might be curious as to why you cannot see the 3D texture property zones you A$ o ?_
defined. They are invisible by default, because drawing thousands of texture xX{gm'3UYa
elements can make displaying and exploring the model somewhat slow. If you zgA/B{DaC;
choose to make them visible, 3D textures are displayed in wireframe, even if the =^gZJ@
display mode is set to translucent. Wireframe rendering displays a bit faster and Vw b6 QIs
shows more of the technical details. NEX{vZkgw
92 * LightTools Introductory Tutorial 3X}>_tj
M `.v/UQn
HAPTER 5 Introduction to Backlight Design |1^
!r Hg
C %jmL#IN )
1.Rotate and zoom the model to that you can see something like the illustration I0C$
below: x)^t5"F
. 8hm|9
2.To reveal the Property Zones: zX ?@[ OT
a.Right-click in the Design View and select View Preferences to display this ? DKwKt
dialog box. G,h=5y9_J
b.On the Visibility tab, click the Property Zone check box to turn it on. E=8$*YUW(g
c.Click OK. +umV l
You will see the wire frame rendering of the spherical bumps on the c *`= o( S
bottom surface, and a solid color above it. The solid color is the 3D texture Kv-4VWh
of the BEFs (brightness-enhancing films) built automatically by the utility.
