Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
2001-10-24
2004-08-03
Shalwala, Bipin (Department: 2673)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C345S206000, C349S042000
Reexamination Certificate
active
06771248
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to, for example, a display module which can be adopted to a liquid crystal display module.
BACKGROUND OF THE INVENTION
A TFT (Thin Film Transistor) liquid crystal display module has been known as a conventional display module. Referring to
FIG. 13
, its structure will be explained. Here, a module means an independent unit which meets requirements for constituting a large system such as a TV set or a personal computer, just by combining these units.
As shown in
FIG. 13
, a conventional TFT liquid crystal module
101
is composed of a controller
102
, a gate electrode driving circuit
103
, a source electrode driving circuit
104
, and a liquid crystal panel
105
. The controller
102
is equipped with a liquid crystal driving power source circuit
106
. The gate electrode driving circuit
103
has a gate driver group including gate drivers GD
1
through GDm. The source electrode driving circuit
104
has a source driver group including source drivers SD
1
through SDn.
The controller
102
controls the generation of scanning pulses in the gate electrode driving circuit
103
, and the timing of N-bit display data signals and driving control signals in the source electrode driving circuit
104
. The controller
102
performs the timing control based on synchronization signals (vertical and horizontal synchronization signals) supplied from an external device (host system).
The liquid crystal driving power source circuit
106
in the controller
102
receives power from an external source, and supplies power to a common electrode for the gate electrode driving circuit
103
, the source electrode driving circuit
104
, and the liquid crystal panel
105
.
The gate drivers GD
1
through GDm in the gate electrode driving circuit
103
are high power output drivers driving gate bus lines Bgs shown in
FIG. 6
, provided in the liquid crystal panel
105
in a horizontal direction. Each of the gate drivers GD
1
through GDm is composed of a LSI chip. Each LSI chip has a TCP (Tape Carrier Package) form so as to connect its input/output terminals to electrodes of other components. That is, each of the gate drivers GD
1
through GDm is installed on a film called a tape carrier in which copper foil wiring is laid out at minute intervals on an insulation film. Each of the gate drivers GD
1
through GDm is sealed with a resin provided for fixing the LSI chip and for protecting the LSI chip from moisture.
The source drivers SD
1
through SDn of the source electrode driving circuit
104
are high power output drivers driving source bus lines Bs's shown in
FIG. 6
, provided in the liquid crystal panel
105
in a vertical direction. Each of the source drivers SD
1
through SDn also has a TCP (Tape Carrier Package) form so as to connect its input/output terminals of the LSI chip to electrodes of other components.
Next, the following description will describe a specific installation structure of the conventional liquid crystal display module. The liquid crystal display module shown in
FIG. 14
has cascaded two gate drivers GD
1
and GD
2
, and cascaded eight source drivers SD
1
through SD
8
. Each of these source drivers SD
1
through SD
8
and the gate drivers GD
1
and GD
2
is composed of a LSI chip.
The gate drivers GD
1
, GD
2
are provided on a common wiring substrate
111
which is common to these gate drivers. Likewise, the source drivers SD
1
through SD
8
are provided on a common wiring substrate
112
which is common to these source drivers. These common wiring substrates
111
and
112
supply common signals and power to the gate drivers GD
1
, GD
2
and the source driver SD
1
through SD
8
. The controller
102
is provided on a controller substrate
113
, which is a substrate different from the common wiring substrates
111
and
112
. Incidentally, a material with reference numeral
114
is a TCP type film having wiring, and a material with reference numeral
115
is a flexible substrate for connecting the wires of the controller substrate
113
with the wires of the common wiring substrates
111
and
112
.
Wires on the TCP type film
114
and ITO (Indium Tin Oxide) wires on the liquid crystal panel
105
are connected by thermocompression bonding at a fringe section
105
a
of the liquid crystal panel
105
, via an ACF (Anisotropic Conductive Film). Meanwhile, the electrical connections between the wires on the TCP type film
114
and the common wiring substrates
111
and
112
, and between the controller substrate
113
and the common wiring substrates
111
and
112
are established by soldering or by the ACF method. The common wiring substrates
111
and
112
and the controller substrate
113
are made of, for example, multi-layer glass epoxy substrates.
Next,
FIG. 15
shows another liquid crystal display module. In this liquid crystal display module, the common wiring substrates
111
and
112
are eliminated by using internal wires in LSI chips. This liquid crystal display module is disclosed in Japanese Unexamined Patent Publication No. 6-3684/1994 (Nishioka 6-3684/1994, published on Jan. 14, 1994), applied by the same applicant of the present invention. In the liquid crystal display module, the gate drivers GD
1
, GD
2
and the source drivers SD
1
through SD
8
are respectively installed on different TCP type films
114
. The electrical connection between the adjacent TCP type films
114
is established by overlapping the ends of the wires of the TCP type films
114
.
Also in this example, the controller
102
is provided on an independent controller substrate
116
, which is made of glass, an epoxy substrate, or a flexible substrate. The controller
102
is connected to the gate drivers GDs and the source drivers SDs via a flexible substrate, by means of the ACF method and soldering.
Another example for electrically connecting the adjacent TCP type films
114
is disclosed in Japanese Unexamined Patent Publication No. 2000-242240/2000 (Tamai et al. 2000-242240, published on Sep. 8, 2000), applied by the same applicant of the present invention. In this example, the foregoing connection is established using a separately provided film substrate having wiring only, or ITO wires for connection provided on the liquid crystal panel
105
, by an ACF method or soldering.
However, recently, a lower priced, and downsized liquid crystal display module has been increasingly demanded in the market, which requires further consideration. Thus, in order to reduce the total cost of a liquid crystal display module and achieve downsizing, a maximized reduction in weight, the number of parts, and wires required in a display driving device including a controller which especially performs plenty of signal transmission, has been strongly desired.
SUMMARY OF THE INVENTION
The object of the present invention is provide a display module which achieves a small and light-weight structure by reducing the number of parts, and achieves cost reduction.
To obtain the foregoing object, a display module in accordance with the present invention includes:
a display device driven by a driving signal in a column direction and a driving signal in a row direction;
a first driving device for supplying the driving signal in a column direction;
a second driving device for supplying the driving signal in a row direction;
a first wiring substrate for mounting thereon the first driving device;
a second wiring substrate for mounting thereon the second driving device; and
a control device for controlling the first and the second driving devices, which is installed on the first or the second wiring substrate together with the first or the second driving device.
According to the foregoing structure, the control device for controlling the first and the second driving devices is installed on the first or the second wiring substrate together with the first or the second driving device. Therefore, the structure eliminates the need for a wiring substrate for installing the control device only, achieving the reduction in the number of parts and cost reduction. Furt
Ogawa Yoshinori
Tanaka Shigeki
Birch Stewart Kolasch & Birch, LLP.
Piziali Jeff
Shalwala Bipin
Sharp Kabushiki Kaisha
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