The default number of bumps is 100 (10 X 10). You need to change these *o8 Df Z
parameters to match your design. Note that LightTools allows many other P:z 5/??2S
placement options, but you will use the Bezier placement option for this EUv xil
example. b|i94y(
5.On both the X Placement tab and Y Placement tab, change the Number of * \@u,[,
Bumps parameter to 300, as shown in the following figure. Click Apply after `(|jm$Q
each change. ^-3R+U- S
6.Click OK to close the dialog box. Qt_LBJ UWV
Note that the number of bumps is 300 X 300, which results in about 90,000 c&Pgz~iP
bumps on the surface (~ 5143 bumps/in2). These bumps are arranged in a @u./VK
manner defined by the Bezier parameterization option. Please see Chapter 5 of `P&L. m]|
the LightTools Core Module User’s Guide for more information. With the P)?) H]J"
current parameter values, the Bezier option varies the bump spacing along the gA e*kf1
length of the light guide. The spacing in the orthogonal direction is constant. 9aw- n* <
The X and Y refer to the local coordinate system of the surface. '1{#I/P;
LightTools Introductory Tutorial * 91 pn 6 e{
Vi~9[&.E\!
HAPTER 5 Introduction to Backlight Design G]fl33_}l
C lY5a=mwHU
Examining Surface Properties ;!(.hCHvr
Using the methods described in previous chapters, you may want to check your }.<%46_Z-
model before you run a simulation. 4_3
DQx9s
Click on various parts of the model in the 3D Design View. Or use the System m: 77pE&o
Navigator to select different surfaces and view their Properties. o@}+ b}R}
1.In the System Navigator, click to open BottomSurface of the LightGuide, then MtAD&+3$
click Zones, and then click Texture. F=C8U$'S
2.Select SphericalElement, and then right-click and select Properties from the 7Zl- |
shortcut menu. The Shape tab shows you a graphical representation of the sF?N vp
spherical bump shape that is the bottom of the light guide. eATX8`W
You might be curious as to why you cannot see the 3D texture property zones you fu/v1Nhm
defined. They are invisible by default, because drawing thousands of texture gk+$CyjJ
elements can make displaying and exploring the model somewhat slow. If you CB5 ~!nKv&
choose to make them visible, 3D textures are displayed in wireframe, even if the 3AWNoXh
display mode is set to translucent. Wireframe rendering displays a bit faster and P7n+@ L$
shows more of the technical details. J7R+|GTcx
92 * LightTools Introductory Tutorial pQaP9Y{OK
,*fvA?
HAPTER 5 Introduction to Backlight Design C[$ uf
C DXAA[hUjF
1.Rotate and zoom the model to that you can see something like the illustration Hh=D :kE
below: @b=b>V[d6
. ' vO+,-
2.To reveal the Property Zones: %=J<WA6\
a.Right-click in the Design View and select View Preferences to display this % Uk]e5Hu
dialog box. XJ;kyEx3=O
b.On the Visibility tab, click the Property Zone check box to turn it on. Pm]6E[zC
c.Click OK. C% <[mM
You will see the wire frame rendering of the spherical bumps on the {5U;9: sO6
bottom surface, and a solid color above it. The solid color is the 3D texture C UOxx,V
of the BEFs (brightness-enhancing films) built automatically by the utility.
