Electric lamp and discharge devices: systems – Plural power supplies – Plural cathode and/or anode load device
Reexamination Certificate
2000-01-27
2002-07-23
Wong, Don (Department: 2821)
Electric lamp and discharge devices: systems
Plural power supplies
Plural cathode and/or anode load device
C345S080000, C349S149000, C445S025000
Reexamination Certificate
active
06424092
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a flat display device which is characterized in a wiring (pattern) for connecting an electrode and a driver circuit, and a wiring method for connecting the electrode and the driver circuit of the flat display device. Further, the present invention relates to an image display system which is constructed in a manner that a plurality of display panels comprising a flat display device are arranged in an adjacent state.
2. Description of the Related Art
As one kind of a flat display panel type display, there is an electro-luminescent display (hereinafter, referred simply to as “ELD”). The ELD has been made based on the principle of an electro-luminescence which is a light emission phenomenon taken place when a voltage is applied to a fluorescent substance (material). Further, the ELD has the following various merits (1) to (3):
(1) since the ELD is a self light emission type display, it has a high luminance (thus, high contrast), a wide viewing angle, and a high response speed;
(2) since the whole of display device consists of a solid, the display device is strong in vibration; and
(3) it is possible to readily make the ELD thin.
In the light of a chemical composition of display material (fluorescent material), the display device of the ELD is classified into an inorganic EL using an inorganic compound and an organic EL using an organic compound. Further, in the light of a physical shape of the display material, the display device of the ELD is classified into a dispersed type EL using a powdered display material, and a thin film EL using a dense thin film display material. In recent years, among these ELs, in particular, an organic thin film EL has attracted special interest from the following reasons. More specifically, a high luminance is obtain at a low voltage, and a fluorescent color itself of the organic compound is a light emission color; therefore, selection of the light emission color is easy.
FIG. 13
shows one example of a structure of the organic thin film EL. In this organic thin film EL
50
, an anode electrode
52
is formed like a stripe on a glass substrate
51
, and has a film thickness of about several hundreds of angstrom to several &mgr;m. The anode electrode
52
is, for example, a transparent electrode consisting of ITO (indium-tin oxide), and is also called as a column electrode because an direction of the stripe is a longitudinal direction of a display screen.
The column electrode
52
is formed with an organic layer
53
having a film thickness of about several hundreds of angstrom to several &mgr;m, at its upper portion and surrounding. The organic layer
53
has a three-layer structure in which an organic positive hole transport layer
54
, an organic light emission layer
55
and an organic electron transport layer
56
are laminated in order when viewing from the column electrode
52
side.
The organic positive hole transport layer
54
consists of a mixture of Alq3 (tris-(8-hydroxyquinoline) aluminum) and DCM (4-dicyanomethylene-6-(p-dimethyleaminostyril)-2-methyle-4H-pyrane, for example. Further, the organic positive hole transport layer
54
has a function of moving a positive hole injected from the column electrode
52
to the organic light emission layer
55
. The organic electron transport layer
56
consists of a triphenyldiamine derivative (TPD) (N,N′-bis (3-methyl phenyl) 1,1′-biphenyl-4,4′-diamine). Further, the organic electron transport layer
55
has a function of moving an electron injected from a row electrode
57
which will be described later to the organic light emission layer
55
.
The organic light emission layer
55
consists of a fluorescent material corresponding to a color to be displayed; for example, DCM is used as a red fluorescent material, Alq3 is used as a green fluorescent material, and a zinc complex of Zn(oxz) 2 (2-(o-hydroxyphenyl)-benzoxazole is used as a blue fluorescent material. In the case of displaying a white color, the following methods are employed; more specifically, there are the methods of dispersing red, green and blue fluorescent materials in a high molecule so as to be synthesized and laminating these fluorescent materials so as to be synthesized.
A cathode electrode
57
is formed like a stripe so as to be perpendicular to the column electrode
52
on the organic electron transport layer
56
. The cathode electrode
57
consists of a metal such as aluminum and an alloy of aluminum and lithium, for example, and is also called as a row electrode because the direction of the stripe is a lateral direction of the display screen.
When a voltage is applied between the column electrode
52
and the row electrode
57
, a positive hole injected from the column electrode
52
is moved to the organic light emission layer
55
via the organic positive hole transport layer
54
while an electron injected from the row electrode
57
being moved to the organic light emission layer
55
via the organic electron transport layer
56
. The positive hole and the electron are mutually recombined at the intersecting point of the column electrode
52
and the row electrode
57
in the organic light emission layer
55
. The fluorescent material constituting the organic light emission layer
55
regards the recombination as an external stimulus, and then, is excited. When returning from the excitation state to a ground state, the fluorescent material radiates a fluorescence; therefore, a light is observed from the glass substrate
51
side.
Thus, the column electrode
52
and the row electrode
57
are used as a signal electrode and a scanning electrode, respectively, and then, a display signal and a scanning signal are supplied to a display panel using the organic thin film EL as a display device, and thereby, it is possible to display a desired image using each intersecting point of the column electrode
52
and the row electrode
57
as a pixel.
FIG. 14
is a circuit diagram showing a construction of a display unit for displaying an image on a display panel
100
using the organic thin film EL as a display device. An analog video signal (display signal) supplied from a video signal reproduction system (not shown) is converted into a digital signal by means of an A/D converter
101
, and thereafter, is supplied to a column driver (driving circuit for display signal supply)
102
. The column driver
102
stores the display signal thus supplied by one line of a screen, and then, supplies the display signal thus stored to all column electrodes (not shown) of the display panel
100
in parallel.
On the other hand, a row driver (driving circuit for scanning signal supply)
103
successively scans the row electrode (not shown) of the display panel
100
one by one at intervals of one field (or one frame). Each operation of the A/D converter
101
, the column driver
102
and the row driver
103
is controlled by means of a controller (e.g., CPU)
104
, and a power supply voltage is supplied from a power supply block
105
to these A/D converter
101
, column driver
102
, row driver
103
and controller
104
.
Conventionally, in the display unit, in order to connect the column electrode and the row electrode to a driver circuit (the column driver
102
and the row driver
103
shown in
FIG. 14
, respectively), a wiring has been given so that these electrodes and the driver circuit are connected at an edge portion of each electrode (i.e., near by the organic thin film EL) in an outer side of a sealing cap for covering and protecting a back side (i.e., side opposite to the glass substrate) of the organic thin film EL. As a result, in the conventional organic thin film EL, the wiring for connecting the column electrode and the row electrode with the driver circuit has been arranged like a picture frame, that is, around the edge of the organic thin film EL.
FIG. 15
shows one example of a state that the aforesaid wiring is given to the organic thin film EL so as to be connected with the driver circuit. The back side of the organic
Asai Nobutoshi
Matsuda Yoshinari
Odake Ryota
Suzuki Yoshio
Megerditchian Samuel H.
Tran Thuy Vinh
Wong Don
LandOfFree
Flat display device and wiring method thereof, and image... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Flat display device and wiring method thereof, and image..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Flat display device and wiring method thereof, and image... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2819882