Electric lamp and discharge devices: systems – Plural power supplies – Plural cathode and/or anode load device
Reexamination Certificate
2001-08-28
2002-10-01
Wong, Don (Department: 2821)
Electric lamp and discharge devices: systems
Plural power supplies
Plural cathode and/or anode load device
C428S690000
Reexamination Certificate
active
06459211
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention is related to a damping/muffling structure for electroluminescent cell in which specific damping material is respectively painted near the light-emitting layer which is the vibration source so as to reduce or eliminate the vibration of the light-emitting layer produced when the light-emitting layer is driven and thus reduce or eliminate noise.
A conventional electroluminescent cell (EL cell) is a thin sheet which mainly serves as a back light element applied to PDA, mobile phone, etc.
FIGS. 1 and 2
show the structure of a conventional EL cell. The EL cell is a thin sheet sequentially including a transparent substrate layer
11
, a front electrode layer (ITO)
12
, a light-emitting layer
13
, an inductive layer
14
, a back electrode layer
15
and an insulating packaging layer
16
attaching thereto. The front electrode layer
12
and the back electrode layer
15
are given an AC voltage, whereby the light-emitting layer
13
of the EL cell can provide a light-emitting effect. In order to enhance the waterproof ability of the EL cell, a waterproof layer
17
is attached to each of the outer faces of the EL cell as shown in FIG.
3
.
The EL cell necessitates the AC voltage for driving the light-emitting layer
13
to light up. However, when driven by the AC voltage, the light-emitting particles in the light-emitting layer
13
will be energized to vibrate. Accordingly, the EL cell itself will vibrate and emit noise. Therefore, the quality of use of the EL cell is affected.
In order to solve the problem of noise, a backing is generally employed to increase the thickness of the EL cell. Alternatively, a sound-absorbing sheet is attached to the back of the EL cell. Still alternatively, the main body of the EL cell is solidly attached to the circuit board. Still alternatively, by means of dimension escape, the noise is reduced.
However, with respect to the EL back light cell used in PDA or mobile phone, the thickness specification is limited when designed. Therefore, the backing or sound-absorbing sheet. attaching to the back of the EL cell may lead to problem of excessive thickness. In the case that the EL back light cell is solidly attached to the circuit, over 60% noise is eliminated. However, it is hard to assemble the modules and the double-face adhesive leads to additional cost.
SUMMARY OF THE INVENTION
It is therefore a primary object of the present invention to provide a damping/muffling structure for electroluminescent cell. A damping layer is additionally integrally connected with the electroluminescent cell. The damping layer is able to truly provide a damping effect. This solves the problem of noise resulting from vibration of the EL cell itself when driven by AC voltage and ensures quality of use of the EL cell.
According to the above object, the damping/muffling structure for electroluminescent cell of the present invention includes a front electrode layer on which a light-emitting layer composed of a number of light-emitting particles is overlaid. An inductive layer is overlaid on the light-emitting layer. A back electrode layer is overlaid on the inductive layer. The back electrode layer is surrounded by an insulating packaging layer. A damping layer is integrally connected with the electroluminescent cell. The damping layer is composed of numerous damping molecules with high damping characteristic. By means of AC current of the front electrode layer and the back electrode layer, the light-emitting layer is driven to emit light and at this time the light-emitting particles are energized and vibrated. A friction is created between the damping molecules of the damping layer. The heat generated due to the friction can be dissipated.
The present invention can be best understood through the following description and accompanying drawings wherein:
REFERENCES:
patent: 4804887 (1989-02-01), Miyama et al.
patent: 5701055 (1997-12-01), Nagayama et al.
patent: 5858561 (1999-01-01), Epstein et al.
patent: 5993932 (1999-11-01), Friedl et al.
patent: 6351068 (2002-02-01), Yamazaki et al.
patent: 6381196 (2002-04-01), Hein et al.
A Minh D
Rosenberg , Klein & Lee
Wintek Corporation
Wong Don
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