Electric lamp and discharge devices: systems – Plural power supplies – Plural cathode and/or anode load device
Reexamination Certificate
2000-07-24
2001-12-04
Wong, Don (Department: 2821)
Electric lamp and discharge devices: systems
Plural power supplies
Plural cathode and/or anode load device
C313S510000
Reexamination Certificate
active
06326735
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a long-life type colorful electroluminescent (EL) display panel and more particularly to an EL display panel that has an electrode structure capable of increasing life span and making the display panel colorful.
2. Description of the Prior Art
It is well known that the so-called electroluminescent (EL) display panel mainly comprises a transparent substrate, a transparent electrode formed on the transparent substrate, a luminescent laminate, and a biasing electrode formed on the luminescent laminate opposite to the transparent electrode. Moreover, a display surface is usually arranged on the surface of the transparent substrate opposite to the transparent electrode. The display surface is usually provided with a pattern.
However, the EL display panel has a specific life span. In case the EL display panel is broken down, a replacement with a new EL display panel could be necessary. However, a procedure for such a replacement is more or less troublesome. Thus, how to increase the life span of the EL display panel would be a project.
Moreover, in terms of a specific pattern in an EL display panel, usually only one color can be presented. Such a display with respect to the pattern is more or less monotonous.
SUMMARY OF THE INVENTION
An object of this invention is to provide an electroluminescent display panel having a life span longer than that of a conventional EL display panel.
The other object of this invention is to provide an electroluminescent display panel capable of presenting a colorful pattern.
To achieve the above objects, an electroluminescent display panel according to the present invention comprises a luminescent laminate, two electrodes located at the two sides of the luminescent laminate, several terminals respectively connected to the two electrodes, and a display surface at one side of one of the two electrodes opposite to the luminescent laminate, and is characterized in that one of the two electrodes includes plural separated sub-electrodes, each sub-electrode comprises at least one branch portion and a bus bar connecting at least one branch portion to one of the terminals, each of the branch portions of the sub-electrodes is accompanied with one branch portion in a different sub-electrode and extends in parallel thereto in a position corresponding to a portion of the display surface which is representative of substantially the same area.
By means of the above structure, since each sub-electrode has one branch portion extending to a position corresponding to a portion of the display surface which is representative of substantially the same area, i.e., substantially the same area can present light by means of the plural sub-electrodes, as well as their respectively corresponding luminescent material, which are actuated one by one, the life span of the EL display panel will increase. Moreover, if the plural sub-electrodes are actuated by electric powers at different frequencies, substantially the same area will present plural colors, and thus a colorful EL display panel is obtainable. Furthermore, if each sub-electrode is actuated one by one at a specific time interval, substantially the same area will present an effect like a neon lamp. Further, if the colors of the lights each emitted by the luminescent material corresponding to one of the sub-electrodes are different, the neon effect will be more colorful.
The advantages and features of this invention can be easily comprehended by persons skilled in the art through the drawings and following detailed explanations.
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Shen Chi-Jung
Wang Shaw-Jong
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
Ritek Corporation
Tran Thuy Vinh
Wong Don
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