The default number of bumps is 100 (10 X 10). You need to change these nGA'\+zj L
parameters to match your design. Note that LightTools allows many other ~o`I[-g)
placement options, but you will use the Bezier placement option for this q #B^yk|Y
example. &F" Mkyf
5.On both the X Placement tab and Y Placement tab, change the Number of 4cK6B )X
Bumps parameter to 300, as shown in the following figure. Click Apply after qPdNI1 |
each change. 0 1 [LPN
6.Click OK to close the dialog box. 'j=7'aX>K
Note that the number of bumps is 300 X 300, which results in about 90,000 D/hQ{ T
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a E)| _7x<u
manner defined by the Bezier parameterization option. Please see Chapter 5 of ;J pdnV
the LightTools Core Module User’s Guide for more information. With the yvo~'k#c
current parameter values, the Bezier option varies the bump spacing along the 0 3L"W^gc
length of the light guide. The spacing in the orthogonal direction is constant. uf,4GPo,
The X and Y refer to the local coordinate system of the surface. <b y}/lF0
LightTools Introductory Tutorial * 91 "iE9X.6NMu
p~M1}mE
HAPTER 5 Introduction to Backlight Design =t l[?6
C MP, l*wVd
Examining Surface Properties Iw~3y{\
Using the methods described in previous chapters, you may want to check your V Y8 p[`
model before you run a simulation. Ky`rf}c I>
Click on various parts of the model in the 3D Design View. Or use the System W?{: HV
Navigator to select different surfaces and view their Properties. |E-0P=h
1.In the System Navigator, click to open BottomSurface of the LightGuide, then /E(H`;DG
click Zones, and then click Texture. y|b|_eE?{
2.Select SphericalElement, and then right-click and select Properties from the S4kGy}{+i
shortcut menu. The Shape tab shows you a graphical representation of the W;*rSK|(Sc
spherical bump shape that is the bottom of the light guide. M*| y&XBe
You might be curious as to why you cannot see the 3D texture property zones you ^a|$z$spf
defined. They are invisible by default, because drawing thousands of texture }.|\<8_
elements can make displaying and exploring the model somewhat slow. If you cH6ie?KvAo
choose to make them visible, 3D textures are displayed in wireframe, even if the k %#`{#n i
display mode is set to translucent. Wireframe rendering displays a bit faster and 4 8M)A
shows more of the technical details. Y- &r_s_~
92 * LightTools Introductory Tutorial +NPk9jn
13G a #
HAPTER 5 Introduction to Backlight Design cs`/^2Vf"#
C W<TW6_*e
1.Rotate and zoom the model to that you can see something like the illustration V
?3>hQtB
below: L7mN&Xr
. (utm+*V,
2.To reveal the Property Zones: &V1N
a1`
a.Right-click in the Design View and select View Preferences to display this X"b4U\ A
dialog box. h{.KPK\
b.On the Visibility tab, click the Property Zone check box to turn it on. 1d!7GrD F
c.Click OK. 4vTO # F
You will see the wire frame rendering of the spherical bumps on the joDnjz=
bottom surface, and a solid color above it. The solid color is the 3D texture Ld? tV i
of the BEFs (brightness-enhancing films) built automatically by the utility.
