Electroluminescence device
First Claim
1. An active matrix electroluminescence display device having plural pixels, each of the pixels comprising;
- a first electrode formed over a substrate;
a first electroluminescent film in contact with the first electrode;
a second electrode in contact with the first electroluminescent film;
a second electroluminescent film in contact with the second electrode; and
a third electrode in contact with the second electroluminescent film,wherein electrodes comprising the first electrode and the third electrode function as one of an anode or a cathode and the second electrode functions as the other of the anode or the cathode, andwherein an electric current flow direction through the first electroluminescent film is different from that through the second electroluminescent film.
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Accused Products
Abstract
An organic EL element has excellent features as compared with other electroluminescent elements, but on the other hand, has a problem that the life of the element is not sufficiently long. In addition, since the organic EL element is expected to be applied to a mobile display and the like, it is also important to improve power efficiency. Hence, an object of the invention is to provide an element structure to realize an improvement in power efficiency and an improvement in the life of the element at the same. In the construction of an organic EL element of the invention, the first electroluminescent film 303 is sandwiched by the first anode 302 and a cathode 304, and the second electroluminescent film 305 and the second anode 306 are laminated over the cathode 304. At this time, the first anode 302 is put into contact with the second anode 306 to form a parallel circuit to decrease an electric current passing through the respective electroluminescent films.
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Citations
38 Claims
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1. An active matrix electroluminescence display device having plural pixels, each of the pixels comprising;
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a first electrode formed over a substrate; a first electroluminescent film in contact with the first electrode; a second electrode in contact with the first electroluminescent film; a second electroluminescent film in contact with the second electrode; and a third electrode in contact with the second electroluminescent film, wherein electrodes comprising the first electrode and the third electrode function as one of an anode or a cathode and the second electrode functions as the other of the anode or the cathode, and wherein an electric current flow direction through the first electroluminescent film is different from that through the second electroluminescent film. - View Dependent Claims (2, 9, 10, 11, 12, 15, 16)
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3. An active matrix electroluminescence display device having plural pixels, each of the pixels comprising;
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a first electrode formed over a substrate; a first electroluminescent film in contact with the first electrode; a second electrode in contact with the first electroluminescent film; a second electroluminescent film in contact with the second electrode; and a third electrode in contact with the second electroluminescent film, wherein electrodes comprising the fist electrode and the third electrode are electrically connected and function as one of an anode or a cathode and the second electrode functions as the other of the anode or the cathode, and wherein an electric current flow direction through the first electroluminescent film is different from that through the second electroluminescent film. - View Dependent Claims (4)
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5. An active matrix electroluminescence display device having plural pixels, each of the pixels comprising;
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a first anode formed over a substrate; a first electroluminescent film in contact with the first anode; a cathode in contact with the first electroluminescent film; a second electroluminescent film in contact with the cathode; and a second anode in contact with the second electroluminescent film, wherein an electric current flow direction through the first electroluminescent film is different from that through the second electroluminescent film. - View Dependent Claims (6, 7, 13, 14)
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8. An active matrix electroluminescence display device having plural pixels, each of the pixels comprising;
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a first cathode formed over a substrate; a first electroluminescent film in contact with the first cathode; an anode in contact with the first electroluminescent film; a second electroluminescent film in contact with the anode; and a second cathode in contact with the second electroluminescent film, wherein an electric current flow direction though the first electroluminescent film is different from that through the second electroluminescent film. - View Dependent Claims (17, 18)
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19. The active matrix electroluminescence display device having plural pixels, each of the pixels comprising;
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a first anode formed over a substrate; a first electroluminescent film in contact with the first anode; a cathode in contact with the first electroluminescent film; a second electroluminescent film in contact with the cathode; and a second anode in contact with the second electroluminescent film, wherein holes are injected into the first electroluminescent film from the first anode and are injected into the second electroluminescent film from the second anode, and wherein electrons are injected into both the first electroluminescent film and the second electroluminescent film from the cathode. - View Dependent Claims (20, 21, 22)
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23. The active matrix electroluminescence display device having plural pixels, each of the pixels comprising;
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a first cathode formed over a substrate; a first electroluminescent film in contact with the first cathode; an anode in contact with the first electroluminescent film; a second electroluminescent film in contact with the anode; and a second cathode in contact with the second electroluminescent film, wherein electrons are injected into the first electroluminescent film from the first cathode and are injected into the second electroluminescent film from the second cathode, and wherein holes are injected into both the first electroluminescent film and the second electroluminescent film from the anode. - View Dependent Claims (24, 25, 26)
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27. The active matrix electroluminescence display device having plural pixels, each of the pixels comprising;
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a first electrode formed over a substrate; a first electroluminescent film in contact with the first electrode; a second electrode in contact with the first electroluminescent film; a second electroluminescent film in contact with the second electrode; and a third electrode in contact with the second electroluminescent film, wherein electrodes comprising the first electrode and the third electrode function as an anode and the second electrode functions as a cathode, wherein the first electroluminescent film comprising a hole transport layer formed over the first electrode and an election transport layer formed over the hole transport layer, and wherein the second electroluminescent film comprising an electron transport layer formed over the second electrode and a hole transport layer formed over the electron transport layer. - View Dependent Claims (28, 29, 30)
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31. The active matrix electroluminescence display device having plural pixels, each of the pixels comprising;
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a first electrode formed over a substrate; a first electroluminescent film in contact with the first electrode; a second electrode in contact with the first electroluminescent film; a second electroluminescent film in contact with the second electrode; and a third electrode in contact with the second electroluminescent film, wherein electrodes comprising the first electrode and the third electrode are electrically connected and function as an anode and the second electrode functions as a cathode, wherein the first electroluminescent film comprising a hole transport layer formed over the first electrode and an electron transport layer formed over the hole transport layer, and wherein the second electroluminescent film comprising an electron transport layer formed over the second electrode and a hole transport layer formed over the election transport layer. - View Dependent Claims (32, 33, 34)
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35. The active matrix electroluminescence display device having plural pixels, each of the pixels comprising;
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a first anode formed over a substrate; a first electroluminescent film in contact with the first anode; a cathode in contact with the first electroluminescent film; a second electroluminescent film in contact with the cathode; and a second anode in contact with the second electroluminescent film, wherein the first electroluminescent film comprising a hole transport layer formed over the first anode and an electron transport layer formed over the hole transport layer, and wherein the second electroluminescent film comprising an electron transport layer formed over the cathode and a hole transport layer formed over the electron transport layer. - View Dependent Claims (36, 37, 38)
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Specification