The default number of bumps is 100 (10 X 10). You need to change these ) (aj
parameters to match your design. Note that LightTools allows many other ,pg\5b
placement options, but you will use the Bezier placement option for this +RuPfw{z
example. G T3wJQ5N
5.On both the X Placement tab and Y Placement tab, change the Number of RH"&B`
Bumps parameter to 300, as shown in the following figure. Click Apply after HZG<aY="
each change. I1TzPe
6.Click OK to close the dialog box. |.q K 69
Note that the number of bumps is 300 X 300, which results in about 90,000 ,o_Ur.UJ
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a ]h ` <E~
manner defined by the Bezier parameterization option. Please see Chapter 5 of 9uRs@]i
the LightTools Core Module User’s Guide for more information. With the o|FY-+
current parameter values, the Bezier option varies the bump spacing along the clc j5=:
length of the light guide. The spacing in the orthogonal direction is constant. !R`) S7!
The X and Y refer to the local coordinate system of the surface. nj@l5[
LightTools Introductory Tutorial * 91 gk*Md+
xIrRFK9[Q
HAPTER 5 Introduction to Backlight Design _BA2^C':c{
C Ep@NT+V nI
Examining Surface Properties jW?siQO^
Using the methods described in previous chapters, you may want to check your 4ZRE3^y\"
model before you run a simulation. :Hn*|+'
Click on various parts of the model in the 3D Design View. Or use the System }EW@/; kC
Navigator to select different surfaces and view their Properties. "]"!"#aM v
1.In the System Navigator, click to open BottomSurface of the LightGuide, then N?7vcN+-t)
click Zones, and then click Texture. '%D$ | )
2.Select SphericalElement, and then right-click and select Properties from the YTtuR`
shortcut menu. The Shape tab shows you a graphical representation of the .\W6XRw
spherical bump shape that is the bottom of the light guide. T9c=As_EM
You might be curious as to why you cannot see the 3D texture property zones you 9 aE .jpN
defined. They are invisible by default, because drawing thousands of texture LMV0:\>
elements can make displaying and exploring the model somewhat slow. If you )/:r $n7
choose to make them visible, 3D textures are displayed in wireframe, even if the 1e0O-aT#Q
display mode is set to translucent. Wireframe rendering displays a bit faster and cITF=Ez
shows more of the technical details. yXpU)|o
92 * LightTools Introductory Tutorial `D#3
:=0XT`i Y
HAPTER 5 Introduction to Backlight Design T{L{<+9%
C 5_d=~whO&2
1.Rotate and zoom the model to that you can see something like the illustration 2K 8?S
below: )bM #s">Y
. F%}0q&
2.To reveal the Property Zones: \mB H6GS
a.Right-click in the Design View and select View Preferences to display this S b9In_*
0
dialog box. e>Z F? (a0
b.On the Visibility tab, click the Property Zone check box to turn it on. N1O& fMz
c.Click OK. u_5O<UP5
You will see the wire frame rendering of the spherical bumps on the /f:)I.FUm
bottom surface, and a solid color above it. The solid color is the 3D texture SSS)bv8m
of the BEFs (brightness-enhancing films) built automatically by the utility.
