Plasma display device

Details Plasma display device Plasma display device

2000-03-13

2002-05-21

Patel, Vip (Department: 2879)

Electric lamp and discharge devices

With gas or vapor

Three or more electrode discharge device

C313S582000, C313S584000

Reexamination Certificate

active

06392344

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a plasma display device, and more particularly, to a plasma display device in which the brightness of a blue pixel is improved.
2. Description of the Related Art
In general, a plasma display device for displaying an image utilizing a gas discharge is widely known as a display device that may replace the CRT (cathode ray tube) due to its superior display capabilities such as display size, brightness, contrast, afterimage, and viewing angle. In the plasma display device, an DC or AC voltage is applied to electrodes, and a gas discharge occurs between the electrodes. Then, ultraviolet rays are emitted to excite phosphors and emit light.
FIG. 1
is an exploded perspective view showing the structure of a common AC type plasma display device. Referring to the drawing, a first electrode
13
X, which is a common electrode, and a second electrode
13
Y, which is a scan electrode, are provided in pairs on an inner surface of a front glass substrate
11
. A third electrode
13
A, which is an address electrode is located on an inner surface of a rear glass substrate
12
. The first electrode
13
X and the second electrode
13
Y, and the third electrode
13
A are strips on the inner surface of the front glass substrate
11
and the rear glass substrate
12
, respectively, such that they cross perpendicularly when the two substrates
11
and
12
are assembled. A dielectric layer
14
and a protective layer
15
are sequentially deposited on an inner surface of the front glass substrate
11
. A plurality of partitions
17
on the upper surface of a dielectric layer
14
′ forming a cell
19
between neighboring partitions
17
. The cell
19
is filled with inert gas such as argon (Ar). Also, a side surface of the cell
19
is coated with a phosphor
18
. Respective cells
19
correspond to pixels producing red (R), green (G) or blue (B) light and are respectively and is coated with phosphors producing corresponding to each color. A bus electrode (not shown) can be provided to enhance the function of the first electrode
13
a
in another example.
In the operation of the plasma display device having the above structure, a high voltage, that is, a trigger voltage, is applied to cause a discharge between the first electrode
13
X and the third electrode
13
A. As cations are accumulated in the dielectric layer
14
by the trigger voltage, a discharge occurs. When the trigger voltage exceeds a threshold voltage, argon gas in the cell
19
changes to a plasma so that a discharge between the neighboring first and second electrodes
13
X and
13
Y can be stably maintained. In the stable discharge ultraviolet rays in the discharge collide with the phosphor
18
which emits light. Thus, each pixel formed by the cell
19
can display an image.
In the above display device, the structure of all pixels is identical and thus the sustaining discharge condition for each cell is the same. As the discharge condition is the same, the brightness of each pixel is proportional to the efficiency of light emission of the phosphor. Actually, the efficiency of light emission of a blue phosphor is the lowest. Thus, when red, green and blue phosphors are excited to emit light under the same conditions, the brightness of the blue pixel is the lowest. Consequently, a white balance white by mixing red, green, and blue colors together cannot be achieved.
According to the conventional technology, to represent white balance, the brightness of red and green cells are lowered to correspond to the level of the brightness of the blue cell by using circuitry decreasing the number of discharge sustaining pulses. However, this method only manages the balance by an overall reduction in the brightness. Therefore, it is a disadvantage in the conventional technology that the overall brightness is lowered.
SUMMARY OF THE INVENTION
To solve the above problem, it is an objective of the present invention to provide a plasma display device having improved brightness.
It is another objective of the present invention to provide a plasma display device in which the brightness of a blue pixel is improved.
Accordingly, to achieve the above objective, there is provided a plasma display device which comprises a front substrate, first and second electrodes formed in parallel on an inner surface of the front substrate, a first dielectric layer formed on the inner surface of the front substrate to cover the first electrode, a rear substrate disposed to face the front substrate, a third electrode formed on an inner surface of the rear substrate to cross the first and second electrodes perpendicularly, a second dielectric layer formed on the inner surface of the rear substrate to cover the third electrode, a partition forming a discharge space above the dielectric layer of the rear substrate, and a phosphor coated on a side surface of the partition corresponding to red, green or blue. In the plasma display device, the width of the first or second electrode at the position corresponding to a discharge space coated with the blue phosphor, extending toward a region where light is not emitted, is formed to be greater than that of each of the first and second electrodes at the position corresponding to a discharge space coated with the red or green phosphor.
It is preferred in the present invention that the distance between the first electrode and the second electrode at the position corresponding to a discharge space coated with the blue phosphor is formed to be narrower than that of the first electrode and the second electrode at the position corresponding to a discharge space coated with the red or green phosphor.
Also, it is preferred in the present invention that the first dielectric layer of the front substrate at the position corresponding to a discharge space coated with the blue phosphor is formed to be thinner than the area of the first dielectric layer corresponding to a discharge space coated with the red or green phosphor.


REFERENCES:
patent: 5565742 (1996-10-01), Shichao et al.
patent: 5661500 (1997-08-01), Shinoda et al.
patent: 5736815 (1998-04-01), Amemiya
patent: 5990617 (1999-11-01), Kanae et al.
patent: 6157354 (2000-12-01), Amemiya
patent: 6288488 (2001-09-01), Amemiya

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