Electric lamp and discharge devices: systems – Plural power supplies – Plural cathode and/or anode load device
Reexamination Certificate
2000-02-23
2004-03-09
Wong, Don (Department: 2821)
Electric lamp and discharge devices: systems
Plural power supplies
Plural cathode and/or anode load device
C345S205000, C361S764000, C257S784000
Reexamination Certificate
active
06703792
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a module for mounting a driver IC (integrated circuit) constituting a drive circuit for driving display electrodes of a display device using a flat display panel and, in particular, relates to a new structure of the module for mounting the driver IC capable of supplying a stable large current having a predetermined peak to a display panel of the display device during operation of the display device.
The module for mounting the driver IC of this structure is typically applied to a display unit having a large-capacity flat display panel configured with a large-number of display cells having capacitive load characteristics, such as a plasma display panel (the whole of the plasma display unit including a plasma display panel and a peripheral circuit is generally referred to as “PDP”), an EL (electroluminescence) panel or a large-sized LCD (liquid crystal display) panel.
2. Description of the Related Art
Remarkable developments and progress in the flat display panels have been made recently. In particular, an AC (alternating current) plasma display panel of three-electrode surface discharge type, which is easy to increase the screen size and to display in color, is applied to a field of a large-capacity flat display panel, e.g, a large-sized color television, and has been put into practical use.
In this type of AC plasma display panel, voltage pulses are applied to two kinds of electrodes for sustaining the discharge alternately to sustain the discharge for luminous display. A period in which the discharge (lighting) occurs, due to the application of each of the voltage pulses, lasts several &mgr;s (microseconds) after the application of each voltage pulse. Ions constituting positive charges generated by the discharge are accumulated over an insulating layer on the electrode which the negative voltage pulse is applied to. In a similar way, electrons constituting negative charges are accumulated over an insulating layer on the electrode which the positive voltage pulse is applied to.
Here, it is assumed that wall charges are generated by discharging with the voltage pulse (write pulse) of a high voltage (write voltage) at first and, subsequently, the voltage pulse having a voltage (sustain voltage) lower than the write pulse and also having the opposite polarity (sustain voltage pulse or sustain pulse). The voltage generated due to the wall charges which have been previously accumulated are superimposed on the sustain voltage to generate a sufficiently large voltage with respect to the discharge space. When such a large voltage exceeds the threshold value of the discharge voltage necessary for starting the discharge, the discharge is started. In other words, the cells in which write discharge has once occurred by means of the write pulse to generate the wall charges, subsequently continue to discharge by applying the sustain pulses to the two kinds of sustain discharge electrodes alternately with opposite polarities. This phenomenon is generally referred to as “memory effect” or “memory drive”. The AC plasma display panel is intended to realize the display utilizing this memory effect.
AC plasma display panels are classified into two types. One type is a two-electrode type of AC plasma display panel for carrying out the selective discharge (addressing discharge) and the sustain discharge with two kinds of electrodes. The other type is a three-electrode type of AC plasma display panel for carrying out the addressing discharge by utilizing a third kind of electrode, in addition to the sustain discharge with two kinds of electrodes. In the color plasma display panel for multi-gradation display, a phosphor formed in the cells is excited by ultraviolet rays generated due to the discharge. However, this phosphor has the disadvantage that it is relatively fragile against the bombardment of ions constituting the positive charges generated at the same time due to the discharge. The two-electrode type of the AC plasma display panel is configured so that ions directly collide with the phosphor, and therefore, the life of the phosphor is likely to become shortened. In order to avoid this disadvantage, the three-electrode type of AC plasma display panel, utilizing the surface discharge (generally referred to as “AC plasma display panel of surface discharge type” or “surface discharge AC plasma display panel”), is generally used.
In order to facilitate understanding of the problems concerning the conventional module for mounting the driver IC, an example of the conventional configuration of the module for mounting the driver IC applied to an ordinary plasma display panel will be explained, with reference to
FIGS. 1
to
10
described later in “BRIEF DESCRIPTION OF THE DRAWINGS”.
A plan view showing a simplified model configuration of an ordinary AC plasma display panel of surface discharge type, is illustrated in FIG.
1
. Further, a sectional view taken along the horizontal direction in
FIG. 1
, schematically showing the configuration of an ordinary AC plasma display panel of surface discharge type, is illustrated in FIG.
2
.
As shown in
FIGS. 1 and 2
, a display panel
300
constituting an ordinary AC plasma display panel of surface discharge type is configured with two glass substrates
310
including a front glass substrate
310
and a rear glass substrate
320
. The front glass substrate
310
has arranged thereon sustain electrodes (X
1
, X
2
, X
3
, . . . , Xj, . . . , Xn, where j is an arbitrary positive integer) constituted by a bus electrode and a transparent electrode and scanning electrodes (Y
1
, Y
2
, . . . , Yj, . . . , Yn).
Addressing electrodes (A
1
, A
2
, Ai, . . . , Am, where and i and m are arbitrary positive integers) are arranged in a form crossing at right angles to the sustain electrodes on the rear glass substrate
320
. These three kinds of electrodes form each display cell
340
for generating the discharge light emission in a regions defined by the scanning electrode and the sustain electrode of the same number crossing at right angles to the addressing electrode. The sustain electrode (Xj), the scanning electrode (Yj) and the addressing electrode (such as Ai−1, Ai and Ai+1) are covered with a dielectric layer
350
for holding the wall charges. Further, a partition wall
330
for isolating the display cells from each other and a phosphor
360
for emitting light by means of ultraviolet rays generated due to the discharge are formed on the dielectric layer on the addressing electrode.
A block diagram showing the essential parts of the drive circuit for the AC plasma display panel of surface discharge type shown in
FIGS. 1 and 2
, is illustrated in FIG.
3
.
As shown in
FIG. 3
, the surface discharge AC plasma display panel drive unit for activating the display panel
300
includes a control circuit
370
for generating a control signal for controlling the drive circuit of the AC plasma display panel of surface discharge type by interface signals (for example, a clock signal CLK, a data signal DATA, a vertical synchronous signal VSYNC and a horizontal synchronous signal HSYNC) input from an external source; and a sustain electrode circuit, a scanning electrode drive circuit and an addressing electrode drive circuit for driving the display electrodes of the display panel by the particular control signal. The sustain electrode drive circuit, the scanning electrode drive circuit and the addressing electrode drive circuit make up the essential parts of the drive circuit for the AC plasma display panel of a surface discharge type.
The sustain electrode drive circuit includes an X common driver
390
for generating the sustain pulse, the scanning electrode drive circuit includes a Y common driver
391
for generating the sustain pulse and a scanning circuit
392
for driving and scanning each scanning electrode independently. The addressing electrode drive circuit, on the other hand, includes an addressing circuit
380
for applying an addressing voltage pulse correspondi
Aoki Masami
Kawada Toyoshi
Koizumi Haruo
Fujitsu Limited
Staas & Halsey , LLP
Tran Thuy Vinh
Wong Don
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