CN1299122A - Plasma display device with low starting voltage and starting method thereof - Google Patents

Abstract

A plasma display device comprises two parallel substrates, between which ionized gas is charged, four electrodes disposed on the two substrates, and a display control circuit connected with the four electrodes for controlling the operation of the four electrodes. The first and second electrodes are parallel arranged on the first substrate, the third electrode is perpendicular to the first and second electrodes and arranged on the second substrate, the fourth electrode is parallel arranged at the adjacent side of the first electrode, and each third electrode projects to the area included by the plane formed by the first electrode and the second electrode to form a display unit for controlling the plasma in the display unit.

Description

Plasma display device with low starting voltage and starting method thereof

The invention relates to a plasma display device, in particular to a plasma display device with low starting voltage.

Among large-size and large-area display devices, a plasma display device (PDP: Plasma Display Panel) is a new type of display device with great potential. Existing plasma display devices require a very large start-up voltage to convert the ionized gas in it into plasma that can be driven back and forth. High-voltage start-up will not only require the use of expensive drive and control components, but also easily cause damage to the components and Shortened service life of components. Therefore, how to reduce the start-up voltage of the plasma display device is a subject of current research.

Refer to Figure 1. FIG. 1 is a cross-sectional view of a conventional plasma display device 10 . The plasma display device 10 includes a first substrate 12 and a second substrate 18 in parallel, an ionized gas 27 is filled between the substrates 12 and 18 , a first electrode 26 , a second electrode 28 and a third electrode 20 . Wherein the first electrode 26 and the second electrode 28 are arranged on the first substrate 12 in parallel and alternately, and the third electrode 20 is arranged on the second substrate 18 in a manner perpendicular to the first electrode 26 and the second electrode 28 superior. The plasma display device 10 also includes a dielectric layer 14 covering the first substrate 12, a protective layer 16 covering the dielectric layer 14, a fluorescent phosphor layer 22 disposed on the third electrode 20 for generating fluorescence, And a protection wall 24 is disposed on the third electrode 20 for isolating two adjacent fluorescent phosphor layers 22 .

A display unit 30 is formed when the third electrode 20 is projected onto the area included in the plane formed by the first electrode 26 and the second electrode 28 . When a high voltage start-up voltage is applied between the first electrode 26 and the second electrode 28 , the electric field effect between the first electrode 26 and the second electrode 28 will make the ionized gas 27 on it generate electron dissociation and form space charge. After the space charge is generated, the third electrode 20 will be used to interact with the first electrode 26 or the second electrode 28 to generate plasma, and determine whether the wall charge (wall charge) density generated in a display unit 30 is acceptable. Large enough to ignite the plasma, this wall charge density is the main key to keep the display unit 30 in the bright state (on) or in the dark state (off). If it is not necessary to keep the bright state, the space charge in the display unit 30 will be restored to normal ionized gas 27 (non-ionized state) within a very short time. After deciding to keep the bright state, the first electrode 26 and the second electrode 28 will be used to reciprocally drive the plasma in the display unit 30 so that it can continuously emit ultraviolet rays, and the ultraviolet rays will be emitted after entering the fluorescent phosphor layer 22 It emits fluorescence, and the user can see the light emitted by the display unit 30 through the transparent substrate 12 .

Both the first electrode 26 and the second electrode 28 are composed of opaque wires 261 , 281 made of CrCuCr material and transparent wires 262 , 282 made of ITO material. Chromium-copper-chromium material has good conductivity but is opaque, while ITO material can transmit part of visible light but has a large resistance value. Since the start-up voltage of the display unit 30 is related to the distance of the ITO material between the first electrode 26 and the second electrode 28, although the transparent wires 262, 282 made of the ITO material will absorb part of the visible light and have a large resistance value, but It can be used to shorten the distance between the first electrode 26 and the second electrode 28 to reduce the start-up voltage of the display unit 30 .

Although the first electrode 26 and the second electrode 28 made of chromium copper chromium and ITO materials used in the known plasma display device 10 can reduce the start-up voltage of the display unit 30, the transparent wires 262 and 282 made of ITO materials will absorb Part of the visible light reduces the brightness of the fluorescent screen, and its high resistance value will cause greater loss.

Therefore, the main purpose of the present invention is to provide a plasma display device with a low start-up voltage to improve the disadvantages of the above known plasma display devices.

To achieve the above object, the present invention provides a method for starting a plasma display device. The plasma display device includes parallel first and second substrates, an ionized gas is filled between the two substrates, and a plurality of first substrates. , the second, third and fourth electrodes are arranged on the two substrates, wherein the plurality of first and second electrodes are arranged on the first substrate in parallel and alternately, and the plurality of third electrodes are perpendicular to the The first and second electrodes are sequentially arranged on the second substrate, and each third electrode is projected onto the area included in the plane formed by the first electrode and the second electrode to form a display unit, which is used for Generate and control the plasma in it, the third electrode of each display unit is used to interact with its first or second electrode to determine whether the plasma in the display unit can continue to exist, and the first and second The electrodes are used to reciprocately drive the plasma in the display unit to maintain the display function of the display unit. The fourth electrode is arranged on the adjacent side of the first electrode. The starting method includes the following steps:

(1) applying a predetermined starting voltage between the first and fourth electrodes, so that the ionized gas in the display unit forms an initial plasma;

(2) Applying a predetermined voltage between the first and second electrodes to diffuse the initial plasma to the entire display unit.

To achieve the above object, the present invention also provides a plasma display device, which includes parallel first substrates and second substrates, ionized gas is filled between the two substrates, a plurality of first, second, third and The fourth electrode is arranged on the two substrates, and a display control circuit is electrically connected to the four electrodes to control the operation of the four electrodes, wherein the plurality of first and second electrodes are arranged in parallel and alternately on the first electrode On a substrate, the plurality of third electrodes are perpendicular to the first and second electrodes and arranged sequentially on the second substrate, and each of the fourth electrodes is arranged on each of the first electrodes in parallel Each of the third electrodes is projected onto the area included in the plane formed by the first electrode and the second electrode to form a display unit, which is used to generate and control the ionized gas formed therein. Plasma, in each display unit, the first and fourth electrodes are used to generate an initial plasma and use the first and second electrodes of the display unit to diffuse it to the entire display unit, the first and second electrodes of the display unit The three electrodes are used to interact with the first or second electrode to determine whether the plasma in the display unit can continue to exist, and the first and second electrodes of the display unit are used to drive back and forth in the display unit. plasma to maintain the display function of the display unit.

A brief description of the drawings

FIG. 1 is a cross-sectional view of a conventional plasma display device.

FIG. 2 is a cross-sectional view of the plasma display device of the present invention.

FIG. 3 is a time sequence diagram of electrode voltages of the plasma display device shown in FIG. 2 .

4 and 5 show the plasma generation method of the display unit shown in FIG. 2 .

FIG. 6 is a schematic structural diagram of the plasma display device in FIG. 2 .

In order to further understand the purpose, advantages and features of the present invention, the following will be described in detail in conjunction with the accompanying drawings.

Refer to Figure 2. FIG. 2 is a cross-sectional view of a plasma display device 60 of the present invention. Plasma display device 60 includes parallel first substrate 62 and second substrate 72, ionized gas 67 is filled between substrates 62 and 72, a plurality of first electrodes 74, second electrodes 78 and fourth electrodes 76 are arranged on the first On the substrate 62, the third electrode 70 is arranged on the second substrate 72, a dielectric layer 64 covers the first substrate 62, a protective layer 66 covers the dielectric layer 64, a fluorescent phosphor layer 82 It is disposed on the third electrode 70 for generating fluorescence, and a protective wall 68 is disposed on the third electrode 70 to isolate two adjacent fluorescent phosphor layers 82 .

The first electrode 74 , the fourth electrode 76 and the second electrode 78 are arranged in parallel and alternately on the first substrate 62 , and the fourth electrode 76 is located between the first electrode 74 and the second electrode 78 . The third electrode 70 is perpendicular to the first electrode 74 and the second electrode 78 and sequentially disposed on the second substrate 72 , while the fourth electrode 76 is disposed parallel to the adjacent side of the first electrode 74 . Each third electrode 70 is projected onto the area included by the plane formed by the first electrode 74 and the second electrode 78 to form a display unit 80 for generating and controlling the plasma formed by the ionized gas 67 therein.

Since the fourth electrode 76 is located very close to the adjacent side of the first electrode 74 , the distance between the two electrodes is shorter than the distance between the first electrode 26 and the second electrode 28 of the plasma display device 10 in FIG. 1 . Since the closer the distance between the two electrodes is, the stronger the electric field will be, and the space free charges can be effectively increased, so the start-up voltage of the display unit 80 can be greatly reduced.

Referring to FIG. 3 , FIG. 3 is a timing chart of the voltages of the electrodes of the plasma display device 60 . In each display unit 80, at time t1, the first electrode 74 is raised to 60V and the fourth electrode 76 is lowered to -60V to generate an initial plasma to increase the space charge and wall charge density, and use the third The electrode 70 is raised to 60V to interact with the fourth electrode 74 to light up the display unit 80 to be turned on. At time t2, it is a well-known address (address) action, which will not be specifically described here. At time t3, in order to maintain the display function of the display unit 80, the first electrode 74 will drop to -60V, the fourth electrode 76 will rise to 60V, and the second electrode 78 will further drop to -90V or lower at time t4. To enhance the wall charge density required to maintain the display function of the display unit 80, and after time t5, the first electrode 74 and the second electrode 78 will alternately increase the voltage to 120V, which is used to reciprocately drive the lights in the display unit 80. The plasma is used to maintain the display function of the display unit 80 .

Referring to FIG. 4 and FIG. 5 , the plasma generation method of the display unit 80 is shown. Figure 4 shows that when starting, a starting voltage is applied between the first electrode 74 and the fourth electrode 76 so that the ionized gas 67 in the display unit 80 will generate an initial plasma 84 due to the pressure of the electric field, and Figure 5 shows A driving voltage is applied between the first electrode 74 and the second electrode 78 to diffuse the initial plasma 84 to the entire display unit 80 .

Refer to Figure 6. FIG. 6 is a schematic structural diagram of a plasma display device 60 . The plasma display device 60 includes a plurality of first electrodes 74 , second electrodes 78 , third electrodes 70 and fourth electrodes 76 , and a display control circuit 92 electrically connected to the four electrodes for controlling the operation of each electrode.

The first electrodes 74 , the fourth electrodes 76 and the second electrodes 78 are arranged parallel to each other and alternately, while the third electrodes 70 are arranged sequentially and perpendicular to the first electrodes 74 , the fourth electrodes 76 and the second electrodes 78 . Each third electrode 70 is projected onto the area included in the plane formed by the first electrode 74 and the second electrode 78 to form a display unit 80 for generating and controlling the plasma therein.

The display control circuit 92 includes a sustain driver (sustain driver) 94 electrically connected to the second electrode 78 of each display unit 80, and a scan driver (scan driver) 98 electrically connected to the first electrode 74 and the second electrode of each display unit 80. Four electrodes 76, a data driver (data driver) 96 are electrically connected to the third electrode 70 of each display unit 80, and a control circuit 100 is used to control the sustain driver (sustain driver) 94, scan driver 98, and data driver 96 operation. The scan driver 98 is used to drive the first electrode 74 and the fourth electrode 76 of each display unit 80 to generate initial plasma, and interacts with the data driver 96 to determine whether the initial plasma of a display unit 80 can continue to exist , and cooperate with the sustain driver 94 to reciprocally drive the plasma in the display unit 80 between the first electrode 74 and the second electrode 78 to maintain the display function of the display unit 80 .

The above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the scope of the claims of the present invention shall fall within the scope covered by the claims of the present invention.

Claims (12)

1. the startup method of a plasma display system, this plasma display device includes first and second parallel substrate, ionized gas is filled between this two substrate, and a plurality of first, second, the the 3rd and the 4th electrode is located at two substrates, wherein these a plurality of first and second electrodes are parallel and are alternately arranged on this first substrate, and these a plurality of third electrodes are perpendicular to this first and second electrode and are arranged in proper order on this second substrate, each this third electrode is projected to the zone that is included by this first electrode and this formed plane of second electrode and forms a display unit, be used for producing and controlling its interior plasma, the third electrode of each display unit is to be used for doing mutually in order to determine whether the plasma in this display unit is existed with its first or second electrode, this first and second electrode then is to be used for back and forth driving the interior plasma of this display unit to keep the demonstration effect of this display unit, the 4th electrode is arranged at the adjacent side of first electrode, and this startup method comprises following steps:

(1) between this first and the 4th electrode, applies a predetermined trigger voltage, so that the ionized gas in this display unit forms an initial plasma;

(2) between this first and second electrode, apply a predetermined voltage, with should initial plasma diffusion whole display unit extremely.

2. startup method as claimed in claim 1, wherein the 4th electrode is arranged on this first substrate.

3. startup method as claimed in claim 2, wherein the 4th electrode is arranged between this first and second electrode.

4. startup method as claimed in claim 1, wherein this plasma display device also includes one scan driver and and keeps first and second electrode that driver is connected electrically in this display unit respectively and be used for back and forth driving plasma in this display unit to keep the demonstration effect of this display unit.

5. startup method as claimed in claim 4, wherein whether this plasma display device also includes the third electrode that a data driver is electrically connected on this display unit and is used for doing mutually to be existed in order to the plasma that determines this display unit to be produced when starting with this scanner driver.

6. startup method as claimed in claim 1, wherein the 4th electrode is provided in a side of very adjacent side near this first electrode to reduce the trigger voltage of this display unit.

7. plasma display system, it includes the first parallel substrate and second substrate, ionized gas is filled between this two substrate, a plurality of first, second, the the 3rd and the 4th electrode is located on this two substrate, and one display control circuit be connected electrically in the operation that this four electrode is used for controlling this four electrode, wherein these a plurality of first and second electrodes are parallel and are arranged on alternately on this first substrate, these a plurality of third electrodes are perpendicular and be arranged in proper order on this second substrate with this first and second electrode, each the 4th electrode then is an adjacent side of being located at each this first electrode abreast, each this third electrode is projected to the zone that is included by this first electrode and this formed plane of second electrode and forms a display unit, be used for producing and control in it by the formed plasma of this ionized gas, in each display unit, this the first and the 4th electrode is to be used for producing an initial plasma and to utilize first and second electrode of this display unit that it is diffused to whole display unit, the third electrode of this display unit is to be used for doing mutually in order to determine whether the plasma in this display unit is existed with this first or second electrode, and first and second electrode of this display unit then is to be used for back and forth driving the interior plasma of this display unit to keep the demonstration effect of this display unit.

8. plasma display system as claimed in claim 7, wherein the 4th electrode is arranged on this first substrate.

9. plasma display system as claimed in claim 8, wherein the 4th electrode is arranged between this first and second electrode.

10. plasma display system as claimed in claim 7, wherein this display control circuit includes one scan driver and and keeps first and second electrode that driver is electrically connected on this display unit respectively and be used for back and forth driving plasma in this display unit to keep the demonstration effect of this display unit.

11. as the plasma display system of claim 10, wherein whether this display control circuit also includes the third electrode that a data driver is electrically connected on this display unit and is used for doing mutually to be existed in order to the plasma that determines this display unit to be produced when starting with this scanner driver.

12. plasma display system as claimed in claim 7, wherein the 4th electrode is provided in a side of very adjacent side near this first electrode to reduce the trigger voltage of this display unit.

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