The default number of bumps is 100 (10 X 10). You need to change these W)1)zOD
parameters to match your design. Note that LightTools allows many other ul/= 1]1?
placement options, but you will use the Bezier placement option for this ;E(gl$c:
example. @y;N
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5.On both the X Placement tab and Y Placement tab, change the Number of enj Ti5X
Bumps parameter to 300, as shown in the following figure. Click Apply after rhMsZ={M
each change. i Ui{)xa2
6.Click OK to close the dialog box. jRm:9`.Q
Note that the number of bumps is 300 X 300, which results in about 90,000 pM@|P,w {
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a Jn +[:s.
manner defined by the Bezier parameterization option. Please see Chapter 5 of 7e/Uc!&*
the LightTools Core Module User’s Guide for more information. With the >J[g)$,
current parameter values, the Bezier option varies the bump spacing along the Pg-~^ "?y
length of the light guide. The spacing in the orthogonal direction is constant. Ht5 %fcD
The X and Y refer to the local coordinate system of the surface. ro6|N?'
LightTools Introductory Tutorial * 91 *SzP7]1 m
[N$da=`wv
HAPTER 5 Introduction to Backlight Design HD IB GG~
C Z=sy~6m+v
Examining Surface Properties im>Sxu@
Using the methods described in previous chapters, you may want to check your gd]vrW'wj
model before you run a simulation. m( C7F a
Click on various parts of the model in the 3D Design View. Or use the System Cmm"K[>Rx
Navigator to select different surfaces and view their Properties. ilw<Q-o4(
1.In the System Navigator, click to open BottomSurface of the LightGuide, then 8Z4d<DIJ
click Zones, and then click Texture. MX|CL{H
2.Select SphericalElement, and then right-click and select Properties from the ) UI$ s"
shortcut menu. The Shape tab shows you a graphical representation of the Cc0`Y lx~(
spherical bump shape that is the bottom of the light guide. U
u(ysN4`
You might be curious as to why you cannot see the 3D texture property zones you LG [ 2u
defined. They are invisible by default, because drawing thousands of texture 5~<> h~yJ
elements can make displaying and exploring the model somewhat slow. If you DifRpj I-0
choose to make them visible, 3D textures are displayed in wireframe, even if the ') 5W
display mode is set to translucent. Wireframe rendering displays a bit faster and rFM`ne<zh
shows more of the technical details. x +! <_p
92 * LightTools Introductory Tutorial >Gk <[0U
`.
/[/ z-g
HAPTER 5 Introduction to Backlight Design I --WS[
C r62 x*?/
1.Rotate and zoom the model to that you can see something like the illustration q#pBlJ.LK
below: B cX}[ ?c
. 7$z")JB
2.To reveal the Property Zones: K8pfk*NZ_@
a.Right-click in the Design View and select View Preferences to display this QB R9BR
dialog box. %;!@\5$
b.On the Visibility tab, click the Property Zone check box to turn it on.
doBfpQ 2
c.Click OK. y+(<Is0w
You will see the wire frame rendering of the spherical bumps on the k*-_CO-h
bottom surface, and a solid color above it. The solid color is the 3D texture "monuErg&
of the BEFs (brightness-enhancing films) built automatically by the utility.
