Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
1999-06-08
2001-12-11
Zimmerman, Mark (Department: 2671)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C345S052000, C345S095000, C345S183000, C349S149000, C349S151000
Reexamination Certificate
active
06329969
ABSTRACT:
TECHNICAL FIELD
The present invention relates to an integrated circuit, for driving liquid crystal, of the type that is mounted on a liquid crystal display substrate.
BACKGROUND ART
A liquid crystal display device of the type having a liquid crystal driving integrated circuit mounted on a liquid crystal display substrate (generally known as a chip-on-glass liquid crystal display device—hereinafter referred to as the “COG liquid crystal display device”) has the problem that it requires a large press-contact area for connecting input electrodes to a flexible printed circuit (hereinafter abbreviated FPC) in order to input power and signals to the liquid crystal driving integrated circuit.
In-view of this, a lateral-lead type COG liquid crystal display device has been proposed in which input terminals of a liquid crystal driving integrated circuit are arranged along a shorter side of a substantially rectangular integrated circuit chip, with an FPC press-contact area provided on the shorter side of the integrated circuit, and electrical conductors leading from electrodes on a liquid crystal display substrate are routed to the shorter side for connection to the input terminals.
FIG. 1
is a schematic diagram showing an input portion of the COG liquid crystal display device having a liquid crystal driving integrated circuit
720
mounted on a liquid crystal display substrate
723
.
In the figure, an input electrode A
701
is an electrode for inputting a signal to the liquid crystal driving integrated circuit
720
via an input terminal A
711
; an input electrode B
702
is an electrode for inputting a signal to the liquid crystal driving integrated circuit
720
via an input terminal B
712
; an input electrode C
703
is an electrode for inputting a signal to the liquid crystal driving integrated circuit
720
via an input terminal C
713
; an input electrode D
704
is an electrode for inputting a signal to the liquid crystal driving integrated circuit
720
via an input terminal D
714
; and an input electrode E
705
is an electrode for inputting a signal to the liquid crystal driving integrated circuit
720
via an input terminal E
715
.
A VDD electrode
707
is an electrode for supplying a high input voltage to the liquid crystal driving integrated circuit
720
via a VDD terminal
716
; a VSS electrode
708
is an electrode for supplying a low input voltage to the liquid crystal driving integrated circuit
720
via a VSS terminal
717
; and a VM electrode
709
is an electrode for supplying an intermediate input voltage to the liquid crystal driving integrated circuit
720
via a VM terminal
718
.
Here, the intermediate input voltage refers to an intermediate-level voltage potential prepared separately from the high and low input voltages. An output terminal array
721
is provided to drive the liquid crystal. A press-contact area
724
provides a space for connecting the input electrodes to the FPC.
In the above-described lateral-lead type liquid crystal driving integrated circuit, since a large number of signal terminals and power supply terminals are arranged along one of the shorter sides of the liquid crystal driving integrated circuit, the arrangement of electrical conductors brought out for connection to the input electrodes and power supply electrodes becomes complex, and the conductors must be made thin because of the limited space. This increases the resistance of the signal electrodes and power supply electrodes, posing various problems when driving the liquid crystal.
Furthermore, when using more than one lateral-lead type liquid crystal driving integrated circuit, as many FPC press-contact areas have to be provided as there are liquid crystal driving integrated circuits.
DISCLOSURE OF THE INVENTION
In a liquid crystal display substrate using a lateral-lead type liquid crystal driving integrated circuit, an object of the present invention is to simplify the arrangement of conductor leads brought out for connection to the power supply electrodes and signal electrodes while, at the same time, reducing the resistance of the conductor leads.
Another object of the present invention is to provide an arrangement of power supply terminals and signal terminals that minimizes the FPC press-contact area.
To achieve the above objects, the present invention provides a liquid crystal driving integrated circuit mounted directly on a liquid crystal substrate, wherein the integrated circuit comprises a plurality of power supply terminal arrays and/or a plurality of signal input terminal arrays, and a substantially rectangular integrated circuit chip containing the integrated circuit is divided into two halves along a line intersecting, at right angles, the longer sides of the chip. A first power supply terminal array and/or a first signal input terminal array are provided on one half of the divided, substantially rectangular integrated circuit chip, and a second power supply terminal array and/or a second signal input terminal array are provided on the other half thereof, wherein the first and second power supply terminal arrays are connected with each other.
The power supply terminal arrays each include a high voltage power input terminal, a low voltage power input terminal, and an intermediate voltage power input terminal.
Further, the first power supply terminal array and the first signal input terminal array are arranged in a clustered fashion along a shorter side of the one half of the integrated circuit chip, and the second power supply terminal array and the second signal input terminal array are arranged in a clustered fashion along a shorter side of the other half chip, wherein the first power supply terminal array is located outward of the first signal input terminal array, and the second power supply terminal array is located outward of the second signal input terminal array.
In an alternative embodiment, the liquid crystal driving integrated circuit of the present invention comprises a plurality of power supply terminal arrays and/or a plurality of signal input terminal arrays, and a substantially rectangular integrated circuit chip containing the integrated circuit is divided into two halves along a line intersecting at right angles with the longer sides of the chip. A first power supply terminal array and/or a first signal input terminal array are provided on one half of the integrated circuit chip, a second power supply terminal array and/or a second signal input terminal array are provided on the other half thereof, and a third power supply terminal array is provided between the first power supply terminal array and the second power supply terminal array, wherein the terminal arrays are connected with one another.
The first and second power supply terminal arrays each include a high voltage power input terminal, a low voltage power input terminal, and an intermediate voltage power input terminal, and the third power supply terminal array includes an intermediate voltage power input terminal.
Further, the first terminal arrays are arranged along a shorter side of the one half chip, the first power supply terminal array being located outward of the first signal input terminal array, while the second terminal arrays are arranged along a shorter side of the other half chip, the second power supply terminal array being located outward of the second signal input terminal array.
In a further alternative embodiment, multiples of the substantially rectangular integrated circuit chip are arranged with shorter sides thereof opposing each other, and the first power supply terminal array and first signal input terminal array and the second power supply terminal array and second signal input terminal array, respectively arranged along the opposing shorter sides, are connected with each other.
In the above description, the term “terminal arrays” collectively refers to the power supply terminal array and signal input terminal array.
ADVANTAGEOUS EFFECT OF THE INVENTION
In the case of the conventional COG liquid crystal display device shown in
FIG. 1
, the space that can be us
Citizen Watch Co. Ltd.
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
Monestime Mackly
Zimmerman Mark
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