Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
2001-04-09
2004-01-27
Shalwala, Bipin (Department: 2673)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C345S055000, C345S065000, C345S066000, C313S493000, C313S582000, C313S584000, C313S586000, C313S587000
Reexamination Certificate
active
06683589
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a surface discharge type plasma display panel and its manufacturing method, and a surface discharge type plasma display device. Especially, the present invention is directed to a structure of barrier ribs and a technique for forming the barrier ribs.
2. Background of the Invention
FIG. 60
is a block diagram showing a plasma display panel device, for example, as disclosed in
FIG. 1
of Japanese Patent Laid-Open Gazette P5-307935A or in
FIG. 14
of U.S. Pat. No. 5,661,500. In
FIG. 60
, the reference character
100
P indicates a plasma display device;
1
P indicates a plasma display panel (hereinafter referred to as a PDP) including X and Y display electrodes (hereinafter referred to as X and Y electrodes, respectively) and an address electrode (hereinafter referred to as an A electrode);
110
P indicates a scan control portion;
120
P indicates an A/D converter for converting an input signal from analog to digital (hereinafter referred to as an A/D);
130
P indicates a frame memory for storing an output of the A/D
120
P;
141
P indicates an X-electrode driving circuit for providing a driving signal to the X electrode of the PDP
1
P;
142
P indicates a Y-electrode driving circuit for providing a driving signal to the Y electrode of the PDP
1
P;
143
P indicates an A-electrode driving circuit for providing a driving signal to the A electrode of the PDP
1
P. The reference character
2
P indicates a drive control system consisting of the A/D
120
P, the frame memory
130
P, the scan control portion
110
P, the X-electrode driving circuit
141
P, the Y-electrode driving circuit
142
P, and the A-electrode driving circuit
143
P.
FIG. 61
is a perspective view showing the outline of a sectional structure of the conventional PDP
1
P, for example, as disclosed in
FIG. 3
of Japanese Patent Laid-Open Gazette No. P5-299019A or in
FIG. 2
of U.S. Pat. No. 5,661,500. In
FIG. 61
, the reference numeral
211
indicates a first substrate which is a front substrate;
217
indicates a dielectric layer covering the X and Y electrodes;
218
indicates a protective layer formed of MgO or the like, for covering the surface of the dielectric layer
217
;
222
indicates an A electrode extending along a second direction orthogonal to a first direction which will be described later;
221
indicates a second substrate which is a rear substrate;
228
indicates a phosphor formed in stripes along side walls of barrier ribs
229
which will be described later, without interruption;
229
indicates a barrier rib formed in parallel along the second direction on the second substrate
221
and separated from each other; and
230
indicates a discharge space filled with discharge gas (Penning gas) including Xe atoms for emitting ultraviolet rays to be absorbed into the phosphors
228
. Further,
241
indicates a strip transparent conductive film consisting of a tin oxide film or the like, and extending in parallel along the first direction at a predetermined interval (discharge gap) so as to constitute X and Y electrodes XEP and YEP; and
242
indicates a strip metal film for supplementing conductivity of the strip transparent conductive film
241
, consisting of multiple films such as Cr—Cu—Cr or Cr—Al—Cr. Each of the X and Y electrodes XEP and YEP consists of the strip transparent conductive film
241
and the strip metal film
242
added to the strip transparent conductive film
241
. The reference character EGP indicates one pixel consisting of three unit luminescent areas EUP emitting red light (R), green light (G), and blue light (B), respectively, (indicated by EUP
R
, EUP
G
, EUP
B
, respectively, in
FIG. 61
) for a color display device. The reference character SP indicates a display surface.
Next, operation of the conventional plasma display device
100
P will be described. The plasma display device
100
P consists of the PDP
1
P, and the drive control system
2
P electrically connected to the X, Y, and A electrodes of the PDP
1
P via a flexible printed circuit board (not shown).
In the drive control system
2
P, an input signal VINP for providing image data is first converted from analog to digital by the A/D
120
P, and digital data outputted from the AID
120
P is stored into the frame memory
130
P. Then, the scan control portion
110
P accesses the digital image signals stored in the frame memory
130
P, and on the basis of the signals, outputs various control signals for controlling drive of the X-electrode driving circuit
141
P, the Y-electrode driving circuit
142
P, and the A-electrode driving circuit
143
P to the corresponding circuits
141
P to
143
P, respectively. Upon receipt of the control signals, the driving circuits
141
P to
143
P apply driving pulse signals such as priming pulses, write pulses, or discharge sustain pulses to their corresponding electrodes, which drives the PDP
1
P.
The PDP
1
P is a three-electrode, surface discharge type PDP where a pair of display electrodes (the X and Y electrodes XEP and YEP) and the A electrode
222
correspond to the unit luminescent areas EU, respectively. Each of the X and Y electrodes XEP and YEP consists of the strip transparent conductive film
241
and the strip metal film
242
, and it is arranged on the inside surface of the first substrate
211
on the side of the display surface SP.
On the other hand, the barrier ribs
229
are provided in strips on the second substrate
211
. A height h of the barrier ribs
229
specifies a height of the discharge space
230
. The discharge space
230
is sectioned per unit luminescent area EUP along an extending direction of the X and Y electrodes XEP and YEP, that is, along the first direction.
On the inside surface of the second substrate
221
between the adjacent barrier ribs
229
formed in parallel with each other, the A electrodes
222
of a predetermined width are arranged by printing and firing a pattern of a silver paste. Further, except where the barrier ribs
229
are in contact with the protective layer
218
and its vicinity, the phosphors
228
emitting red light R, green light G, blue light B, respectively are provided so as to cover the inside surface of the second substrate
221
.
Accordingly, in the PDP
1
P, the continuous stripe phosphors
228
are provided almost on the whole inside surface of the second substrate
221
including both side surfaces of the barrier ribs
229
and the surface of the A electrodes
222
.
Further, in some cases, a layer (black stripe) using a low melting point glass with a black pigment added, for example, may be provided on the inside surface of the first substrate
211
in order to prevent deterioration in image contrast due to extraneous light entering from outside through the first substrate
211
forming the display surface SP.
The aforementioned conventional technique, however, contains some problems. For easy understanding of one of those problems, a logic of phenomena of the discharge and the propagation of ultraviolet rays will be described schematically with reference to FIG.
62
.
On occurrence of discharge (especially display discharge) between the X and Y electrodes, Xe atoms included in discharge gas are excited and emit 147 nm ultraviolet rays. This emission of ultraviolet rays occurs when Xe atoms of resonance level return to their ground level, accompanied with what is called “self absorption”. The “self absorption” is a phenomenon that the ultraviolet rays once emitted from the Xe atoms are absorbed by different Xe atoms being at a ground level, and the different Xe atoms are excited.
These excited different Xe atoms will also emit ultraviolet rays of the same wavelength when returning to their ground level. By repeating the self absorption and the emission of ultraviolet rays in this way, the 147 nm ultraviolet rays propagate and diffuse at random within the discharge space.
FIGS. 62A and 62B
schematically show this self absorption of ultraviolet rays.
Since the ultraviolet rays propagate and diffuse within the discharge sp
Saikatsu Takeo
Sano Ko
Uchiumi Toyohiro
Yasue Takao
Yoshikawa Kanzou
Kovalick Vincent E.
Mitsubishi Denki & Kabushiki Kaisha
Shalwala Bipin
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