Computer graphics processing and selective visual display system – Display driving control circuitry
Reexamination Certificate
1998-06-24
2001-06-12
Hjerpe, Richard (Department: 2774)
Computer graphics processing and selective visual display system
Display driving control circuitry
Reexamination Certificate
active
06246398
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a technology for externally displaying an output of an application specific Integrated Circuit (ASIC), and more particularly to a display apparatus having an application specific IC.
2. Background of the Related Art
FIG. 1
is a block diagram illustrating a related art external display apparatus for an application specific IC. As shown in
FIG. 1
, the related art external display apparatus for an application specific IC includes an application specific IC (ASIC)
1
, a driving unit
2
for outputting a driving signal OUT in accordance with a signal INTERFACE received from the application specific IC
1
, and a display unit
3
formed of a seven-segment Liquid Crystal Display (LCD) or Dot Matrix Liquid Crystal Display(LCD) for externally displaying a value that corresponds to an output signal OUT of the driving unit
2
.
The signal INTERFACE outputted from the application specific IC
1
is a two-level (high and low) signal. The driving unit
2
converts the two-level signal INTERFACE to a multi-level signal OUT. The respective wave forms of the signals INTERFACE, OUT are shown in
FIGS. 2A and 2B
. The display unit
3
then externally displays the resultant output of the application specific integrated circuit
1
in accordance with the signal OUT.
The application specific IC
1
outputs a signal of a high or low level. However, the display unit
3
including the LCD or the like requires a multi-level signal. Therefore, to externally display the resultant value of the application specific IC
1
using the display unit
3
formed of LCD requires a provision of the driving unit
2
to drive the display unit
3
. As illustrated in
FIG. 1
, the driving unit
2
is formed of an additional semiconductor chip.
The related art external display apparatus for an ASIC has various disadvantages. The external display apparatus for an application specific integrated circuit
1
includes additional devices to drive the LCD, such as the driving unit
2
, which increases production cost and circuit area. Further, the application specific integrated circuit
1
requires additional hardware and software to interface with the driving unit
2
.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a display apparatus for an application specific IC that substantially solves at least one of the above-described problems and disadvantages of the related art.
Another object of the present invention is to reduce production cost.
A further object of the present invention is to reduce circuit area.
A further object of the present invention is to eliminate additional hardware and/or software.
Another object of the present invention is to add a device inside the application specific IC to generate data to display a resultant value in a display unit.
A further object of the present invention is to provide a display apparatus for externally displaying an output for an application specific IC that uses additional devices including resistors and three-phases buffer in the application specific IC.
To achieve at least the above-described objects in a whole or in parts, there is provided a display apparatus according to the present invention that includes an application specific integrated circuit (ASIC) having an integrated circuit and a converting unit that converts a two-level signal outputted from the integrated circuit to a plurality of four-level signals by controlling a current flow and a display unit that displays respective output values of the ASIC based on the plurality of multi-level signals.
The present invention may be achieved in a whole or in parts by an application specific integrated circuit (ASIC) according to the present invention that includes an integrated circuit formed in a first semiconductor chip that performs a prescribed function; and a converting unit disposed in the integrated circuit that receives a first signal and a plurality of second signals outputted from the integrated circuit and outputs one of (a) the output signal of the integrated circuit and (b) a fraction of the output signal.
The present invention may be achieved in a whole or in parts by a display driving apparatus for an application specific integrated circuit according to the present invention that includes a first signal and a plurality of second signals output by the application specific integrated circuit; a logic-gate that logically processes the first signal; and a plurality of converters respectively coupled in parallel to the logic-gate to form a plurality of current paths, wherein each of the plurality of converters receive the first signal, and wherein current flow in a selected current path can be reversed based on the output signal of the integrated circuit.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objects and advantages of the invention may be realized and attained as particularly pointed out in the appended claims.
REFERENCES:
patent: 5030856 (1991-07-01), Dansky et al.
patent: 5309151 (1994-05-01), Aoki
patent: 5406312 (1995-04-01), Arimoto
patent: 5532718 (1996-07-01), Ishimaru
Fleshner & Kim LLP
Hjerpe Richard
Hyundai Electronics Industries Co,. Ltd.
Laneau Ronald
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