The default number of bumps is 100 (10 X 10). You need to change these 0r+%5}| -K
parameters to match your design. Note that LightTools allows many other (Js'(tBhiU
placement options, but you will use the Bezier placement option for this W1s4[rL!Ht
example. ^xGdRa U#
5.On both the X Placement tab and Y Placement tab, change the Number of ;Vad| -
Bumps parameter to 300, as shown in the following figure. Click Apply after &OiJJl[9
each change. '%>$\Lv
6.Click OK to close the dialog box. B%L0g.D "
Note that the number of bumps is 300 X 300, which results in about 90,000 RJ%~=D
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a \DE`tkV8
manner defined by the Bezier parameterization option. Please see Chapter 5 of Cp_YIcnEJ
the LightTools Core Module User’s Guide for more information. With the (,E.1j]ji
current parameter values, the Bezier option varies the bump spacing along the QMzBx*g(
length of the light guide. The spacing in the orthogonal direction is constant. 7ST[XLwt%}
The X and Y refer to the local coordinate system of the surface. PT|W{RlNl
LightTools Introductory Tutorial * 91 5 s>$
ES Z6<!S
HAPTER 5 Introduction to Backlight Design CW Y'q
C P(W7,GD,k
Examining Surface Properties J0}OmNTzD
Using the methods described in previous chapters, you may want to check your 1_7} B4
model before you run a simulation. @ Zs}8YhC
Click on various parts of the model in the 3D Design View. Or use the System kg$<^:uX
Navigator to select different surfaces and view their Properties. t`DoTb4
1.In the System Navigator, click to open BottomSurface of the LightGuide, then _wg6}3
click Zones, and then click Texture. EY(@R2~#J
2.Select SphericalElement, and then right-click and select Properties from the ti'a ^(
shortcut menu. The Shape tab shows you a graphical representation of the ;fhFv&`mE
spherical bump shape that is the bottom of the light guide. $+sNjwv^F
You might be curious as to why you cannot see the 3D texture property zones you e jwFQ'wTx
defined. They are invisible by default, because drawing thousands of texture UKx9 1a}g
elements can make displaying and exploring the model somewhat slow. If you tWi@_Rlx;
choose to make them visible, 3D textures are displayed in wireframe, even if the # Vanw !
display mode is set to translucent. Wireframe rendering displays a bit faster and r}P{opn$t
shows more of the technical details. .h^."+TJ
92 * LightTools Introductory Tutorial -\j}le6;c
=F
ZvtcCa
HAPTER 5 Introduction to Backlight Design 9[|Ql
C nVoPTr
1.Rotate and zoom the model to that you can see something like the illustration Z-b^{uP
below: L^ VG ?J
. Xb42 R1
2.To reveal the Property Zones: -lyT8qZ:(
a.Right-click in the Design View and select View Preferences to display this 38%]G Q
dialog box. ~l-Q0wg
b.On the Visibility tab, click the Property Zone check box to turn it on. fw_V'l#\
c.Click OK. 8 @!/%"Kt2
You will see the wire frame rendering of the spherical bumps on the r9G<HKl
bottom surface, and a solid color above it. The solid color is the 3D texture )[6H!y5
of the BEFs (brightness-enhancing films) built automatically by the utility.
