Driving circuit of display and display device

Details Driving circuit of display and display device Driving circuit of display and display device

2001-08-28

2004-09-07

Shalwala, Bipin (Department: 2673)

Computer graphics processing and selective visual display system

Display driving control circuitry

C345S036000, C345S045000, C345S051000, C345S076000, C345S077000, C345S080000, C345S082000, C345S083000, C345S084000, C345S090000, C345S205000, C345S690000

Reexamination Certificate

active

06788298

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a driving circuit of a display and a display device and more particularly to the driving circuit of the display made up of light emitting elements including an EL (Electroluminescence) element, an LED (Light Emitting Diode) element, a VFD (Vacuum Fluorescent Display) (FED (Field Emission Display) being one of the VFDs in particular) element or a like and used to display various kinds of information, measurement results, moving pictures or still pictures and to the display device equipped with the driving circuit of the display described above.
The present application claims priority of Japanese Patent Application No. 2000-259984 filed on Aug. 29, 2000, which is hereby incorporated by reference.
2. Description of the Related Art
Conventionally, some displays are made up of light emitting elements which include an EL element, LED, VFD (FED in particular), or the like. Of them, an EL display constructed of the EL elements is considered to be promising since it has many advantages in that it can be made planar, thinner, and more lightweight, that it can provide excellent visibility by spontaneous light and can provide quick response and that it can display moving pictures. Conventionally, an inorganic EL element using inorganic materials such as ZnS:Mn (zinc sulfide:manganese) or a like is mainstream, however, an organic EL element using organic materials such as a stilbene derivative or a like has been developed recently.
FIG. 9
is a schematic perspective view for showing configurations of a conventional organic EL display made up of such the organic EL element. An organic EL display
1
shown in
FIG. 9
configured so as to display full color includes a plurality of data electrodes (anodes)
3
formed on a transparent substrate
2
at specified intervals and in a stripe form, a hole injected layer
4
formed on the transparent substrate
2
and on an entire surface of the data electrodes
3
, a hole transporting layer
5
formed on an entire surface of the hole injected layer
4
, light emitting layers
6
to
8
each emitting a green color (G) light, red color (R) light, and blue color (B) light, respectively, arranged in order of a green color light emitting element, red color light emitting element and blue color light emitting element, in a sequentially repeated manner and in a manner to correspond to column-directional arrangement of the data electrodes
3
and arranged in a manner that the light emitting layers
6
to
8
to emit light of same color out of the light emitting layers
6
to
8
are placed consecutively in a row direction, an electron transporting layer
9
formed on entire surfaces of the hole transporting layer
5
and light emitting layers
6
to
8
and a plurality of scanning electrodes (cathode)
10
formed on the electron transporting layer
9
in a row direction at specified intervals. The transparent substrate
2
is made up of glass or a like. The data electrode
3
is made up of a transparent electrode such as ITO (Indium Tin Oxide) or a like. The hole injected layer
4
and hole transporting layer
5
are made up of a triphenyldiamine derivative, carbazole derivative or the like. The light emitting layers
6
to
8
are made up of the stilbene derivative or a like. The electron transporting layer
9
is made up of a perylene derivative. The scanning electrode
10
is made up of a metal electrode such as an aluminum film. In the above organic EL display
1
, each of its regions producing the green, red, and blue colors respectively is hereinafter called an organic EL element EL
G
, organic EL element EL
R
, and organic EL element EL
B
, respectively.
In the organic EL display
1
of this example, one pixel is made up of dot pixel portions consisting of the three organic EL elements EL
G
, EL
R
, and EL
B
each emitting one color out of three primary colors including green, red, and blue colors. The organic EL display
1
is called a “stripe” organic EL display since the organic EL element EL
G
, EL
R
and EL
B
each corresponding to each of the dot pixel portions are arranged in order of the green color light emitting EL element EL
G
, red color light emitting EL element EL
R
, and blue color light emitting EL
B
in a column direction and in a sequentially repeated manner and the organic EL elements to emit light of same color, out of the organic EL element EL
G
, EL
R
, and EL
B
are consecutively arranged in a row direction. Moreover, in the organic EL display
1
of the example, a pixel portion made up of the dot pixel portions is placed at an intersection of each of the data electrodes
3
formed at specified intervals in a column direction and each of the scanning electrodes
10
formed at specified intervals in a row direction, that is, the pixel portions made up of the dot pixel portions are arranged in a matrix form, and a character, image, or a like are displayed by light-emitting of the light emitting layers
6
to
8
corresponding to an arbitrary dot pixel portion occurring when a data signal produced based on a video signal is applied to the data electrodes
3
and a scanning signal produced based on a horizontal sync signal and a vertical sync signal is applied to the scanning electrodes
10
. Therefore, the above organic EL display
1
is called a “simple-matrix EL display”.
FIG. 10
is a schematic block diagram showing an example of configurations of a conventional driving circuit to drive the organic EL display
1
having configurations described above. As shown in
FIG. 10
, each of the scanning electrodes
10
is installed from a right end toward a left end in a display region
1
a
and is routed from the left end to an outside of the display region
1
a
and is further connected to each of scanning terminals (not shown) mounted in the left end of the organic EL display
1
at specified intervals. The data electrodes
3
are divided into two portions at an approximately central place of the display region
1
a
. Each of the divided data electrodes
3
installed from the approximately central place to an upper end of the display region
1
a
is routed to an upper portion on an upper side of the display region
1
a
and is connected to each of data terminals (not shown) mounted at an upper end of the organic EL display at specified intervals. Each of the divided data electrodes
3
installed from the approximately central place to a lower end of the display region
1
a
is routed to a lower portion on a lower side of the display region
1
a
and is connected to each of data terminals mounted (not shown) at a lower end of the organic EL display
1
at specified intervals. Data signal fed from both the data terminals (not shown) existing in the upper and lower direction is applied to two data electrodes
3
existing on a same column. The above method for applying the data signal to the data electrodes
3
is called a “double scanning method”. This double scanning method is employed recently since there is a need to reduce a peak current which flows through the organic EL display
1
at a time of driving the organic EL display
1
because an IC (integrated circuit) making up data electrode driving circuits
12
and
13
described later that can withstand a high voltage is not available and since it is difficult to drive all organic EL elements only by one data electrode driving circuit due to an increase in numbers of the organic EL elements to be driven by one data electrode which has occurred to meet the demand for a larger screen and higher resolution in the organic EL display
1
and since there is an increasing demand for higher luminance in the organic EL display.
The conventional driving circuit chiefly includes a controller
11
, data electrode driving circuits
12
and
13
and a scanning electrode driving circuit
14
. The controller
11
produces a green video signal S
G
, red video signal S
R
, and blue video signal S
B
based on a video signal S
P
supplied from outside and feeds them to the data electrode driving circuits
12
and
1

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