Integrated circuit device and display device with the same

Details Integrated circuit device and display device with the same Integrated circuit device and display device with the same

1999-12-21

2003-06-10

Shalwala, Bipin (Department: 2673)

Computer graphics processing and selective visual display system

Computer graphics display memory system

Addressing

C345S467000, C345S537000, C345S571000

Reexamination Certificate

active

06577318

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an integrated circuit device for driving a flat display board or the like.
2. Description of the Related Art
A fluorescent display module is built in a dot character type fluorescent display device which is a flat display unit.
FIG. 1
is a schematic diagram showing a conventional fluorescent display module.
FIG. 2
is a schematic illustration showing one divided display part
110
in FIG.
1
.
FIG. 3
is a schematic illustration showing anode lines
102
in FIG.
1
.
As shown in
FIG. 1
, a conventional fluorescent display module is provided with a fluorescent character display tube
100
which is a flat display board, and an integrated circuit device
300
for driving the fluorescent character display tube
100
. The fluorescent character display tube
100
has a capability of displaying, for example, 15-digit alphanumeric characters and katakanas (angular Japanese phonetic syllabary). Such a fluorescent character display tube
100
includes fifteen divided display parts
110
. One divided display part
110
is composed of 5(crosswise)×8(lengthwise) dots of minimum light emission display. Each of 5(crosswise)×8(lengthwise) anodes
101
(A
1
-A
40
) is composed of one dot of minimum light emission unit, as shown in FIG.
2
.
The fluorescent character display tube
100
includes, as shown in
FIG. 1
, input terminals
103
(AI
1
-AI
40
), and forty anode lines
102
are connected to the input terminals AI
1
-AI
40
, respectively. The anodes
101
, which are disposed at the same position at each digit, are commonly connected to respective input terminal
103
(AI
1
-AI
40
) by the anode lines
102
, as shown in FIG.
3
. For example, fifteen anodes A
5
are connected to the input terminal AI
5
by one anode line
102
.
Furthermore, the fluorescent character display tube
100
includes, as shown in
FIG. 1
, input terminals
106
(GI
1
-GI
15
), and fifteen grid lines
105
are connected to the input terminals GI
1
-GI
15
, respectively. Each digit has one grid
104
(GI
1
-GI
15
) as a digit electrode, which is connected to the input terminals
106
(GI
1
-GI
15
), respectively.
The integrated circuit device
300
has output terminals
311
(ao
1
-ao
40
) and
312
(go
1
-go
15
). From the output terminals
311
(ao
1
-ao
40
), outputted are anode voltages that drive the anodes
101
corresponding to a display pattern. From the output terminals
312
(go
1
-go
15
), outputted is a grid voltage that drives each grid
104
by time-sharing.
The fluorescent character display tube
100
and the integrated circuit device
300
are mounted on a printed circuit board (not shown). On the printed circuit board, there are provided wirings
325
for connecting the input terminals
103
of fluorescent character display tube
100
and the output terminals
311
of integrated circuit device
300
. There are provided with, on the printed circuit board, wirings
326
for connecting the input terminals
106
of fluorescent character display tube
100
and the output terminals
312
of integrated circuit device
300
.
FIG. 4
is a block diagram showing the integrated circuit device
300
in FIG.
1
.
The integrated circuit device
300
includes a control part
301
that inputs and outputs various signals including display data for the fluorescent character display tube
100
. The integrated circuit device
300
also includes a memory part
302
that consists of RAM for writing and reading display data and the like and ROM for reading only according to output signals from the control part
301
. Furthermore, the integrated circuit device
300
includes an anode drive part
303
for outputting anode voltages according to the display data read from the memory part
302
and obtained via the control part
301
, and a grid drive part
304
for outputting grid voltages sequentially to each grid
104
by time sharing, based on timing signals from the control part
301
.
The control part
301
has a counting part
305
for reading display data from the memory part
302
as parallel data according to a count signal, and a parallel/serial conversion part
306
for outputting parallel data converted into serial data. To the output side of anode drive part
303
, connected is the output terminals
311
(ao
1
-ao
40
) for anode voltage, and to the output side of grid drive part
304
, the output terminals
312
(go
1
-go
15
) for grid voltage is connected.
FIG. 5
is an illustration showing data stored in the memory part
302
in a conventional integrated circuit device
300
.
As shown in
FIG. 5
, in the memory part
302
, stored are 5(crosswise)×8(lengthwise) bits of display data to be displayed at each digit of the fluorescent character display tube
100
. The address of display data at each bit is designated by the row address R
0
-R
7
and the column address C
0
-C
4
corresponding to the anode A
1
-A
40
.
Now, operations of the conventional fluorescent display module configured as mentioned above will be described.
When a count signal from the counting part
305
is supplied for the memory part
302
, the display data of the digits to be displayed are read sequentially from the memory part
302
as parallel data for each
5
bits of column addresses C
0
-C
4
, from the row addresses R
0
through the row addresses R
7
. The read parallel data are outputted after their 5-bit data have been serialized by the parallel/serial conversion part
306
, from the C
0
side toward the C
4
side of column address. The serial data are inputted sequentially into a shift register included in the anode drive part
303
. Once all of the 5(crosswise) ×8(lengthwise) bits of display data have been inputted into the shift register, anode voltages for anodes A
1
-A
40
are outputted simultaneously from the output terminals
311
(ao
1
-ao
40
). At the same time, a timing signal is supplied from the control part
301
to the grid drive part
304
, and grid voltages from the output terminals
312
(go
1
-go
15
) are applied to the digits that are driven in response with the timing signal.
Successively in the same fashion, an anode voltage and a grid voltage are sequentially supplied to respective anode
101
and grid
104
of each digit by a dynamic grid drive by time-sharing, and thus predetermined characters or the like are displayed.
Next, description is given of a printed circuit board on which the integrated circuit device
300
is mounted.
FIG. 6
is a schematic diagram showing the relationship between the printed circuit board and the integrated circuit device
300
in a conventional fluorescent display module.
The integrated circuit device
300
is disposed on the underside of the printed circuit board
320
. On the periphery of integrated circuit device
300
, the output terminals
311
(ao
1
-ao
40
) corresponding to the anodes
101
(A
1
-A
40
) of fluorescent character display tube
100
are disposed in the counterclockwise order. The output terminals
312
(go
1
-go
15
) corresponding to the grids
104
for fifteen digits are disposed in the clockwise order on the periphery of integrated circuit device
300
. These positions are determined at the designing stage. Besides, other input terminals and power supply terminals (not shown) are also disposed on other regions of the periphery of integrated circuit device
300
. Within the integrated circuit device
300
, the above-mentioned circuits are electrically connected to the terminals.
The printed circuit board
320
includes forty input terminals
321
to which the output terminals
311
of integrated circuit device
300
are connected, and fifteen input terminals
322
to which the output terminals
312
of integrated circuit device
300
are connected. The printed circuit board
320
further includes forty output terminals
323
to which the input terminals
103
of fluorescent character display tube
100
are connected, and fifteen output terminals
324
to which the input terminals
106
of fluorescent character display tube
100
are connected. Th

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