The default number of bumps is 100 (10 X 10). You need to change these %((cFQ9
parameters to match your design. Note that LightTools allows many other -~]^5aa5n
placement options, but you will use the Bezier placement option for this PE7t_iSV
example. Pd& ,G$l
5.On both the X Placement tab and Y Placement tab, change the Number of &0h=4i=6r
Bumps parameter to 300, as shown in the following figure. Click Apply after ;l#?SYY
each change. k pY%&
6.Click OK to close the dialog box. =KW|#]RB^
Note that the number of bumps is 300 X 300, which results in about 90,000 |>[X<>m
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a 2?pM5n
manner defined by the Bezier parameterization option. Please see Chapter 5 of [sptU3,2U
the LightTools Core Module User’s Guide for more information. With the v5gQ9
current parameter values, the Bezier option varies the bump spacing along the mlmnkgl
]
length of the light guide. The spacing in the orthogonal direction is constant. 2q$X>ImI$
The X and Y refer to the local coordinate system of the surface. % $\}z( G
LightTools Introductory Tutorial * 91 nO%<;-=u\
`v<f}
HAPTER 5 Introduction to Backlight Design .1%i`+uZ
C PKATw>zg<
Examining Surface Properties 5\5~L
Using the methods described in previous chapters, you may want to check your 0YHYx n
model before you run a simulation. ~JT lPU'
Click on various parts of the model in the 3D Design View. Or use the System C!I\Gh
Navigator to select different surfaces and view their Properties. 5Wj5I S/
1.In the System Navigator, click to open BottomSurface of the LightGuide, then 6.vNe
click Zones, and then click Texture. 5M]6'X6I
2.Select SphericalElement, and then right-click and select Properties from the Q9nu"x
%
shortcut menu. The Shape tab shows you a graphical representation of the 2voNg Y
spherical bump shape that is the bottom of the light guide. gZ ~y}@L y
You might be curious as to why you cannot see the 3D texture property zones you W|FNDP0
defined. They are invisible by default, because drawing thousands of texture 5@""_n&FV
elements can make displaying and exploring the model somewhat slow. If you CVi<~7Am\
choose to make them visible, 3D textures are displayed in wireframe, even if the MEDskvBG
display mode is set to translucent. Wireframe rendering displays a bit faster and CcbWW4 )
shows more of the technical details. KS8\F0q
92 * LightTools Introductory Tutorial c
'/2F0y
:r[W'h_%
HAPTER 5 Introduction to Backlight Design r] xd hR5
C ba A HP "
1.Rotate and zoom the model to that you can see something like the illustration @)+i{Niuv
below: z, :+Oc
. l ,ZzB,"
2.To reveal the Property Zones:
; \ Y-
a.Right-click in the Design View and select View Preferences to display this H74NU_
dialog box. ye9QTK6$,
b.On the Visibility tab, click the Property Zone check box to turn it on. {_+>"esc
c.Click OK. _zAc 5rS
You will see the wire frame rendering of the spherical bumps on the b 49|4
bottom surface, and a solid color above it. The solid color is the 3D texture 3Ro7M=]
of the BEFs (brightness-enhancing films) built automatically by the utility.
