The default number of bumps is 100 (10 X 10). You need to change these j /V_h'}
parameters to match your design. Note that LightTools allows many other g4W$MI
placement options, but you will use the Bezier placement option for this -]%EX :bm
example. -e_fn&2,Y
5.On both the X Placement tab and Y Placement tab, change the Number of ^!['\
Bumps parameter to 300, as shown in the following figure. Click Apply after %Z;RY5
each change. 1N/4 W6
6.Click OK to close the dialog box. C&O8fNB_
Note that the number of bumps is 300 X 300, which results in about 90,000 %Tp9G Gt
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a v]JET9hY
manner defined by the Bezier parameterization option. Please see Chapter 5 of >^8O :.
the LightTools Core Module User’s Guide for more information. With the {/[@uMS_6]
current parameter values, the Bezier option varies the bump spacing along the O"9t,B>=i
length of the light guide. The spacing in the orthogonal direction is constant. cMK|t;"
3
The X and Y refer to the local coordinate system of the surface. ` `xm##K
LightTools Introductory Tutorial * 91 +m_ .?V6
4DIU7#GG
HAPTER 5 Introduction to Backlight Design HoBx0N9\2
C <?7Cw W
Examining Surface Properties PpRS4*nR
Using the methods described in previous chapters, you may want to check your x1 =`Z@^
model before you run a simulation. '[
c-$X2Ak
Click on various parts of the model in the 3D Design View. Or use the System 2d[tcn$;h]
Navigator to select different surfaces and view their Properties. ~XUU rg;
1.In the System Navigator, click to open BottomSurface of the LightGuide, then EXdX%T\
click Zones, and then click Texture. 1@ Ba7>%'
2.Select SphericalElement, and then right-click and select Properties from the {[uhIJD3g6
shortcut menu. The Shape tab shows you a graphical representation of the +kI}O*s
spherical bump shape that is the bottom of the light guide. Q-) ( s
You might be curious as to why you cannot see the 3D texture property zones you .)*&NY!nsl
defined. They are invisible by default, because drawing thousands of texture nS#F*)
elements can make displaying and exploring the model somewhat slow. If you hl]d99Lc
choose to make them visible, 3D textures are displayed in wireframe, even if the `=Mk6$%Cs
display mode is set to translucent. Wireframe rendering displays a bit faster and cg ) (L;
shows more of the technical details. Eu |/pH=:
92 * LightTools Introductory Tutorial HOD?i_
~'*23]j
HAPTER 5 Introduction to Backlight Design
,]wab6sY
C Vc\g"1 x
1.Rotate and zoom the model to that you can see something like the illustration U/c+j{= ~
below: |@d(2f8
. X&Oo[Z
2.To reveal the Property Zones: 03?ADjO
a.Right-click in the Design View and select View Preferences to display this :M6|V_Yp
dialog box. h `Jc%6o
b.On the Visibility tab, click the Property Zone check box to turn it on. (R=ZI
c.Click OK. dC <%D'L*
You will see the wire frame rendering of the spherical bumps on the P]"@3Z&w
bottom surface, and a solid color above it. The solid color is the 3D texture "]^ U(m>f
of the BEFs (brightness-enhancing films) built automatically by the utility.
