Electric lamp and discharge devices: systems – Plural power supplies – Plural cathode and/or anode load device
Reexamination Certificate
2001-02-20
2001-10-02
Philogene, Haissa (Department: 2821)
Electric lamp and discharge devices: systems
Plural power supplies
Plural cathode and/or anode load device
C315S169100, C345S905000, C361S748000, C361S762000, C362S800000
Reexamination Certificate
active
06297598
ABSTRACT:
BACKGROUND OF THE INVENTION
(1) Field of the Invention
This invention relates to semiconductor device package, particularly to light emitting diode (LED) package.
(2) Brief Description of the Prior Art
FIG. 1
shows the top view of a tri-color light emitting diode module for providing the back-light for a display panel. An insulating substrate
10
is plated with four separate metallic plates,
11
,
12
,
13
and
14
. A red LED chip
111
has a bottom electrode mounted on the metal plate
11
and a top electrode wire bonded to the common metal plate
14
. The green LED chip
112
is mounted on the metal plate
12
and has two top electrodes. One of the electrodes is wire-bonded to metal plate
12
, and another electrode is wire-bonded to the common metal plate
14
. The blue LED chip
113
is mounted on the metal plate
13
and has two top electrodes. One of the electrodes is wire-bonded to metal plate
13
and another electrode is wire-bonded to the common metal plate
14
. The metal plates
11
,
12
,
13
,
14
are wrapped around the corners
121
,
122
,
123
,
124
of the substrate
10
respectively to reach the bottom of the substrate.
FIG. 1
illustrates that the LEDs can have both electrodes on top of the chip or have one top electrode and one bottom electrode. While the tri-color LEDs are illustrated to produce full color, it should be pointed out that two color LEDs, eg. red and green, may also be used to produce red, green, yellow and other mixed colors. When two color LEDs are used, only three metal plates (i.e. one more than the number of LEDs) need be used.
FIG.2
shows the bottom view of the substrate. The extensions of the plates
11
,
12
,
13
14
at the top surface of the substrate
10
wrapping around the corners
121
,
122
,
123
,
124
respectively become contacts
21
,
22
,
23
,
24
respectively. The contacts are suitable for surface mounting of the LED module to a motherboard.
When such a LED module is used as the back light of a display, the prior art system is shown in FIG.
7
. The color module
15
described in
FIGS. 1 and 2
is mounted over a plate which is parallel to the display panel
19
. The light emitted vertically from module
15
is reflected by a mirror
16
to a light conducting plate
18
. The light from the light conducting plate is diffused by a translucent plate
19
to serve as the back light for the display panel
19
. In such a system, a mirror is needed to reflect the color lights, because the lights emitted from the module
16
is perpendicular to the display
19
.
SUMMARY OF THE INVENTION
An object of this invention is to provide a LED module which emits light in a direction parallel to the motherboard on which the module is mounted. Another object of this invention is to eliminate to use of a reflecting mirror to furnish back light for a light panel.
These objects are achieved by mounting the light emitting diode chips perpendicular to the motherboard so that the light emits in a direction parallel to the motherboard. The bottom contacts of the module are lined up on only one side of the module. These contacts are then soldered to the motherboard with the substrate of the module in a vertical position.
REFERENCES:
patent: 4466050 (1984-08-01), Lockard
patent: 5136479 (1992-08-01), Ruffner
patent: 5313289 (1994-05-01), Nagane et al.
patent: 6115016 (2000-09-01), Yoshihara et al.
Chang Bill
Wang Bily
Harvatek Corp.
Lin H.C.
Philogene Haissa
Tran Thuy Vinh
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