KR100670362B1 - Display device - Google Patents

Abstract

A display device is provided to emit visual rays with uniform brightness by applying different number of pulses on a third electrode, which is arranged under an electron acceleration layer. A display device includes first and second substrates(110,120), first and second electrodes(121,122), plural third electrodes(131r,131g,131b), an electron acceleration layer, gas, and light emitting material layers. The first and second substrates are arranged to face each other. Plural cells are formed between the first and second substrates. The first and second electrodes are arranged between the first and second substrates. The third electrodes are arranged between the first and second substrates. The electron acceleration layer is formed on the third electrode and emits plural electrons inside the cells, when a pulse voltage is applied on the third electrode. The gas is filled inside the cell and generates a UV(Ultra-Violet) ray, when agitated by the electrons. The light emitting material layers are arranged inside the cell and generate a visual ray, when agitated by the UV ray. The duration of the pulse voltage, which is applied on the respective cells, is varied according to the brightness characteristic of the visual ray.

Description

Display device

1 is an exploded perspective view of a conventional plasma display panel.

2A and 2B are cross-sectional views illustrating the plasma display panel of FIG. 1 cut in the horizontal and vertical directions, respectively.

3 is a schematic cross-sectional view of a display device according to an exemplary embodiment of the present invention.

4 is a timing diagram illustrating an example of a driving voltage applied to each electrode of the display device of FIG. 3.

5 is a timing diagram illustrating another example of a driving voltage applied to each electrode of the display device of FIG. 3.

6 is a schematic cross-sectional view of a display device according to another exemplary embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

110,210 ... First substrate 113,213 ... Bulkhead

114r, 114g, 114b, 214r214g, 214b..cell

115r, 115g, 115b, 215,215g, 215b ... light emitting layer

120,220 ... second substrate 121,221 .... first electrode

122,222 ... second electrode 123,223 ... second dielectric layer

124,224 Protective film 126,226 First dielectric layer

131r, 131g, 131b231r231g, 231b ... Third electrode

140,240 ... electron acceleration layer 211 ... address electrode

212 ... third dielectric layer

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device, and more particularly, to a display device capable of improving luminous efficiency.

Plasma Display Panel (PDP), which is a kind of display device, is an apparatus for forming an image by using an electric discharge, and its use is increasing day by day because of its excellent display performance such as brightness and viewing angle. In the plasma display panel, gas discharge occurs between the electrodes by a direct current or an alternating voltage applied to the electrodes, and phosphors are excited by ultraviolet rays generated in the discharge process to emit visible light.

The plasma display panel may be classified into a plasma display panel having a facing discharge structure and a plasma display panel having a surface discharge structure according to the arrangement of the electrodes. In a plasma display panel having an opposite discharge structure, two pairs of sustain electrodes are disposed on an upper substrate and a lower substrate, respectively, so that discharge occurs in a direction perpendicular to the substrate. In the plasma display panel having the surface discharge structure, two pairs of sustain electrodes are disposed on the same substrate so that discharge occurs in a direction parallel to the substrate.

1 shows a plasma display panel of a conventional AC type surface discharge structure. 2A and 2B illustrate cross-sectional views of the plasma display panel of FIG. 1 cut in the horizontal and vertical directions.

1, 2A and 2B, the lower substrate 10 and the upper substrate 20 are disposed to face each other at regular intervals to form a discharge space in which plasma discharge occurs. A plurality of address electrodes 11 are formed on an upper surface of the lower substrate 10, and the address electrodes 11 are filled by the first dielectric layer 12. A plurality of partition walls are formed on the upper surface of the first dielectric layer 12 to form a plurality of discharge cells 14 by dividing the discharge space, and to prevent electrical and optical cross talk between the discharge cells 14. 13) is formed. Phosphor layers 15 of red (R), green (G), and blue (B) are respectively coated on the inner walls of the discharge cells 14. In addition, a discharge gas including xenon (Xe) is generally filled in the discharge cells 14.

 The upper substrate 20 is a transparent substrate through which visible light can pass and is coupled to the lower substrate 10 on which the partitions 13 are formed. On the lower surface of the upper substrate 20, a pair of sustain electrodes 21a and 21b are formed in a direction orthogonal to the address electrodes 11 for each discharge cell 14. Here, the sustain electrodes 21a and 21b are mainly made of a transparent conductive material such as indium tin oxide (ITO) to transmit visible light. In order to reduce the line resistance of the sustain electrodes 21a and 21b, bus electrodes 22a and 22b made of metal are formed on the bottom surfaces of the sustain electrodes 21a and 21b. It has a narrower width than). The sustain electrodes 21a and 21b and the bus electrodes 22a and 22b are buried by the transparent second dielectric layer 23. A protective film 24 made of magnesium oxide (MgO) is formed on the bottom surface of the second dielectric layer 23. The protective layer 24 prevents damage to the second dielectric layer 23 by sputtering of plasma particles and lowers the discharge voltage by emitting secondary electrons.

The driving of the plasma display panel having the above structure is largely divided into driving for address discharge and driving for sustain discharge. The address discharge occurs between the address electrode 11 and one of the pair of sustain electrodes 21a and 21b, and wall charge is formed. Next, the sustain discharge is caused by the potential difference between the pair of sustain electrodes 21a and 21b, and the phosphor layer 15 is excited by the ultraviolet rays generated from the discharge gas during the sustain discharge to emit visible light. The emitted light is emitted through the upper substrate to form an image that can be recognized by the user.

On the other hand, the above-described plasma discharge is applied to a display device mainly used as a backlight of an LCD (Liquid Crystal Display). The display device used as a backlight is similar to that of FIGS. 1, 2A, and 2B, but has a structure without an address electrode and a second dielectric layer covering the address electrode.

In a display device used as a plasma display panel and a backlight, ultraviolet rays are generated while the discharge gas is ionized and the xen ^* of the excited state is stabilized during the plasma discharge. In this process, the energy required to create and accelerate ions that are not helpful for light emission is much more than half, and the luminous efficiency was very low due to unnecessary energy loss. In addition, due to the characteristics of the discharge, if the cell is made small, the efficiency is lowered and the discharge is unstable, which makes it difficult to implement a high definition plasma display panel.

The present invention has been made to solve the above problems, and an object thereof is to provide a new display device capable of improving luminous efficiency.

In order to achieve the above object and other objects, the present invention, the first substrate and the second substrate disposed to face each other to form a plurality of cells therebetween; A plurality of first electrodes and second electrodes spaced apart from each other between the first substrate and the second substrate; A plurality of third electrodes disposed between the first substrate and the second substrate; An electron acceleration layer formed on the third electrode and configured to emit a plurality of electrons into the cell as a pulse voltage is applied to the third electrode; A gas filled in the cell and excited by electrons emitted from the electron acceleration layer to generate ultraviolet rays; And a light emitting layer disposed inside the cell and excited by ultraviolet rays to generate visible light, wherein the light emitting layer includes red, green, and blue light emitting layers, and each cell includes any one of a red, green, and blue light emitting layers. Is provided, and the application period of the pulse voltage applied to each cell varies according to the luminance characteristics of the visible light of the red, green, and blue light emitting layers.

According to another aspect of the present invention, it is preferable that a cell including a light emitting layer having good luminance characteristics among red, green and blue light emitting layers has a shorter application period of a pulse voltage.

According to another aspect of the present invention, the luminance characteristics of the red, green, and blue light emitting layers are referred to as Lr, Lg, and Lb, respectively, and the application periods of the pulse voltages applied to the red, green, and blue light emitting layers are Tr, Tg, respectively. , And Tb, if the luminance characteristic of each light emitting layer is Lr = Lg> Lb, the application period of the pulse voltage is preferably Tr = Tg <Tb.

According to another feature of the present invention, the first electrode and the second electrode may be disposed on the second substrate.

According to another aspect of the present invention, the third electrode may be disposed on the first substrate.

According to this further feature of the invention, the first electrode and the second electrode extend in parallel with each other.

According to still another aspect of the present invention, the electronic device may further include an address electrode disposed between the first substrate and the second substrate and extending to cross the direction in which the first electrode and the second electrode extend.

According to another feature of the present invention, the address electrode may be disposed on the first substrate.

The invention also provides a first substrate and a second substrate disposed opposite to each other to form a plurality of cells therebetween in order to achieve the above object; A plurality of first electrodes and second electrodes spaced apart from each other between the first substrate and the second substrate; A plurality of third electrodes disposed between the first substrate and the second substrate; An electron acceleration layer formed on the third electrode and configured to emit a plurality of electrons into the cell as a pulse is applied to the third electrode; A gas filled in the cell and excited by electrons emitted from the electron acceleration layer to generate ultraviolet rays; And a light emitting layer disposed inside the cell and excited by ultraviolet rays to generate visible light, wherein the light emitting layer includes red, green, and blue light emitting layers, and each cell includes any one of a red, green, and blue light emitting layers. Is provided, and the number of pulses applied to each cell varies according to the luminance characteristics of the visible light of the red, green, and blue light emitting layers.

According to another aspect of the present invention, it is preferable that the number of pulses is smaller as a cell including a light emitting layer having good luminance characteristics among the red, green, and blue light emitting layers.

According to another feature of the present invention, the luminance characteristics of the red, green, and blue light emitting layers are referred to as Lr, Lg, and Lb, respectively, and the number of pulses applied to the red, green, and blue light emitting layers is represented by Nr, Ng, and When Nb, if the luminance characteristic of each light emitting layer is Lr = Lg> Lb, it is preferable that the number of pulses is Nr = Ng <Nb.

According to another feature of the present invention, the first electrode and the second electrode may be disposed on the second substrate.

According to another aspect of the present invention, the third electrode may be disposed on the first substrate.

According to this further feature of the invention, the first electrode and the second electrode extend in parallel with each other.

According to still another aspect of the present invention, the electronic device may further include an address electrode disposed between the first substrate and the second substrate and extending to cross the direction in which the first electrode and the second electrode extend.

According to another feature of the present invention, the address electrode may be disposed on the first substrate.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like reference numerals in the drawings denote like elements.

3 is a schematic cross-sectional view of a display device according to an exemplary embodiment of the present invention.

Referring to FIG. 3, the first substrate 110, which is a lower substrate, and the second substrate 120, which is an upper substrate, are disposed to face each other at regular intervals. Here, the first substrate 110 and the second substrate 120 may be made of a transparent glass substrate.

The space between the first substrate 110 and the second substrate 120 is partitioned between the first substrate 110 and the second substrate 120 to form a plurality of cells, and electrical and optical between the cells. A plurality of barrier ribs 113 for preventing crosstalk are provided. Although the shape of the partition wall is not illustrated in the drawings, it may be formed in a stripe shape or a matrix shape, and may be formed in various shapes.

The first electrode (holding electrode) 121 and the second electrode (scanning electrode) 122 are spaced apart from each other and extend in parallel to the rear surface of the second substrate 120. Each of the first electrode 121 and the second electrode 122 is made of a metal for electrical conductivity and transparent electrodes 121a and 122a made of a transparent conductive material such as indium tin oxide (ITO) so that visible light can pass therethrough. It may be formed of bus electrodes 121b and 122b. An alternating voltage is alternately applied to the first electrode 121 and the second electrode 122 to perform a sustain discharge between the first electrode 121 and the second electrode 122.

The first electrode 121 and the second electrode 122 are buried by the second dielectric layer 123. A passivation layer 124 made of magnesium oxide (MgO) may be formed on the bottom surface of the second dielectric layer 123. The passivation layer 124 prevents damage of the second dielectric layer 123 due to the sputtering of plasma particles and lowers the discharge voltage by emitting secondary electrons.

In each cell, a light emitting layer is applied. The light emitting layer may be applied to any one of a side surface of the barrier rib 113, an upper surface of the first substrate 110, and a lower surface of the second substrate 120, but in the drawing, a lower surface of the second substrate 120, more specifically, a protective film 124. ) Is applied to the lower surface. The light emitting layer is specifically composed of red (R), green (G), and blue (B) light emitting layers 115r, 115g, and 115b, and any of red (R), green (G), and blue (B) light emitting layers. One is applied for each said cell. Hereinafter, a cell coated with the red emitter layer 115r is represented by a red cell 114r, a cell coated with the green emitter layer 115g is represented by a green cell 114g, and a cell coated with the blue emitter layer 115b is represented by a blue cell. 114b). Accordingly, the pixel Px of the smallest unit for implementing one image includes the red cell 114r, the green cell 114g, and the blue cell 115b.

The cells 114r, 114g, and 115b may be filled with a gas including any one of neon, helium (He), argon (Ar), or a mixture thereof, including xenon (Xe). Nitrogen (N2), deuterium, carbon dioxide (CO ₂ ), hydrogen (H ₂ ) and carbon monoxide (CO) may also be filled. The gas may act as a discharge gas, and may also act as an excitation gas that is excited by external energy such as electrons to generate ultraviolet rays.

Third electrodes 131r, 131g, and 131b are formed for each cell on the upper surface of the first substrate 110, and the third electrodes are buried by the first dielectric layer 126. An electron acceleration layer 140 for emitting a plurality of electrons into the cell by the voltage applied to the upper surface of the third electrode is formed. In this case, it is preferable that one surface of the electron acceleration layer 140 is drawn into the discharge space. The electron acceleration layer 140 may apply any material capable of accelerating electrons to generate electrons. That is, the electron acceleration layer 140 may be made of oxidized porous silicon, wherein oxidized porous silicon includes oxidized porous polysilicon or oxidized porous amorphous silicon. Is illustrated. In addition, the electron acceleration layer 140 has a metal insulator metal (MIM) structure, a surface conduction emission emitter display (SED) structure, a boron nitride bamboo shoot (BNBS) structure, and a carbon nano tube (CNT). It may be either.

The third electrode is used as a cathode electrode, and when a predetermined voltage is applied to the third electrode, the electron acceleration layer 140 accelerates a plurality of electrons introduced from the third electrode to emit electrons into the cell. Let's do it. The electrons are preferably greater than the energy needed to excite the gas and have less energy than the energy needed to ionize the gas. In general, 12.13 eV of energy is required to ionize xenon (Xe), and 8.28 eV or more is required to excite xenon (Xe). Specifically, in order to excite xenon (Xe) in 1S ₅ , 1S ₄ , and 1S ₂ states, energy of 8.28 eV, 8.45 eV, and 9.57 eV is required. The excited xenon (Xe ^* ) is stabilized to generate ultraviolet rays of approximately 147 nm. Then, the excited state (excited state) xenon (Xe ^*) and the ground state (ground state) xenon (Xe) When a crash excimer (eximer) xenon (Xe ₂ ^*) there is generated, such an excimer xenon (Xe ₂ ^*) When this is stabilized, ultraviolet rays of approximately 173 nm are generated. Accordingly, electrons emitted into the cell by the electron acceleration layer 140 may have an energy of about 8.28 eV to 12.13 eV to excite xenon (Xe).

Electrons emitted into the cell are sustained and discharged between the first electrode 121 and the second electrode 122 by an alternating voltage applied alternately to the first electrode 121 and the second electrode 122. This makes it easier to carry out.

On the other hand, according to such a structure, the potential of the driving voltage (for example, an alternating voltage) can be lowered compared with the conventional plasma display panel as shown in FIG. 1, and the luminous efficiency is improved. On the other hand, in the present invention, based on the structure of the display device described above, according to the luminance characteristics of the visible light generated in the red, green and blue light emitting layers (115r, 115g, 115b), red, green and blue cells 114r The voltage (pulse) applied to the third electrodes 131r, 131g, and 131b in the 114g and 114b is varied. That is, as the luminance characteristics of the red, green, and blue light emitting layers 115r, 115g, and 115b are better, the third electrodes 131r, 131g, and 131b of the corresponding red, green, and blue cells 114r, 114g, and 114b are provided. The application period of the applied voltage (pulse) is shortened or the number of applied pulses is reduced. This will be described later with reference to FIG. 4.

Meanwhile, in FIG. 3, the first electrode 121 and the second electrode 122 are disposed on the rear surface of the second substrate 120, and the third electrodes 131r, 131g, and 131b are upper surfaces of the first substrate 110. Although illustrated as being disposed in, the position of each electrode is not limited thereto. For example, the first electrode 121 and the second electrode 122 may be disposed in the partition wall 133, and the third electrodes 131r, 131g, and 131b may be the partition wall 131 or the second substrate 120. It may also be disposed on the lower surface.

4 is a timing diagram illustrating an example of a driving voltage applied to each electrode of the display device of FIG. 3.

Referring to the drawings, FIG. 4 illustrates driving voltages applied to the electrodes of the display device of FIG. 3 to perform sustain discharge.

Hereinafter, the first electrode may be used as the sustain electrode X, and the second electrode may be used as the scan electrode Y. AC voltages are alternately applied to the scan electrode Y and the sustain electrode X. While the alternating current voltage is applied, the third electrode in the red, green and blue cells 114r, 114g, 114b according to the luminance characteristics of the red, green, and blue light emitting layers 115r, 115g, 115b. The application periods of the pulses applied to the 131r, 131g, and 131b are different. That is, the application periods of the pulses applied to the third electrodes of the corresponding cells are shortened in order of good luminance characteristics among the red, green, and blue light emitting layers 115r, 115g, and 115b. If the luminance characteristic Lr of the red light-emitting layer, the luminance characteristic Lg of the green light-emitting layer, and the luminance characteristic Lb of the blue light-emitting layer have a relationship of Lr = Lg> Lb, respectively, the third electrode 131r of the red cell , The pulse application period Tr of Er), the pulse application period Tg of the third electrodes 131g and Eg of the green cell, and the pulse application period Tb of the third electrodes 131b and Eb of the blue cell are Tr. It is preferable to have a relationship of = Tg <Tb. In a cell including a light emitting layer having relatively low luminance characteristics, luminance variation for each cell can be corrected by lengthening the application period of the pulse applied to the third electrode, and the scanning electrode Y and the sustain electrode X The potential level of the alternating voltage applied to the voltage can be lowered, and eventually the luminous efficiency is improved.

On the other hand, since the third electrode (131r, 131g, 131b) serves as a cathode electrode so that a plurality of electrons are emitted from the electron acceleration layer 140, applying a pulse applied to the third electrode at a low level as shown in the figure desirable. On the other hand, unlike the figure, the pulse applied to the third electrode of each cell may be applied only to the initial application of the AC voltage applied to the scan electrode (Y) and the sustain electrode (X).

5 is a timing diagram illustrating another example of a driving voltage applied to each electrode of the display device of FIG. 3.

Referring to the difference from FIG. 4, in FIG. 5, the red cell (i.e., the red light emitting layer 115r, the green light emitting layer 115g, and the blue light emitting layer 115b) according to the luminance characteristics of the red light emitting layer 115r while the AC voltage is applied. 114r), the number of pulses applied to the third electrodes 131r, 131g, and 131b in the green cell 114g and the blue cell 114b, respectively, is varied. That is, the number of pulses applied to the third electrode of the corresponding cell is reduced in order of good luminance characteristics among the red, green, and blue light emitting layers 115r, 115g, and 115b. If the luminance characteristic Lr of the red light emitting layer, the luminance characteristic Lg of the green light emitting layer, and the luminance characteristic Lb of the blue light emitting layer each have a relationship of Lr = Lg> Lb, the third electrode 131r of the red cell ), The number of pulses Ng of the third electrode 131g of the green cell, and the number of pulses Nb of the third electrode 131b of the blue cell have a relationship of Nr = Ng <Nb. It is preferable. At this time, the application period of the pulse applied to the third electrodes 131r, 131g, and 131b of each cell is Tr = Tg = Tb.

6 is a schematic cross-sectional view of a display device according to another exemplary embodiment of the present invention.

The structure of the display device of FIG. 6 is similar to that of the display device of FIG. 3, with the difference that the address electrode 211 is further added than that of FIG. 3. In the display device of FIG. 3, since the first electrode 121 and the second electrode 122 extend side by side, the display device of FIG. 6 may be used as a light source such as a backlight of the LCD, and the display device of FIG. Since the address electrode 211 crosses the 221 and the second electrode 222, it can be used as a display device for implementing an image by itself.

Referring to the drawings, the first substrate 210 and the second substrate 220 facing each other, the first electrode 221, the second electrode 222, the third electrode (231r, 231g, 231b), the first The first dielectric layer 226, the second dielectric layer 223, the third dielectric layer 212, the protective film 224, the partition wall 213, the light emitting layers 215r, 215g and 215b, the address electrode 211 and the electron acceleration layer ( 240).

The first electrode 221 and the second electrode 222 are disposed on the bottom surface of the second substrate 220, and the first electrode 221 and the second electrode 222 extend in parallel with each other. The first electrode 221 and the second electrode 222 may be formed of transparent electrodes 221a and 221a such as ITO and bus electrodes 221b and 222b for electrical conductivity, respectively, so that visible light can be transmitted therethrough. The first electrode 221 and the second electrode 222 are buried by the second dielectric layer 223. The passivation layer 224 may be disposed on the bottom surface of the second dielectric layer 223.

The partition wall 213 partitions a cell that is a discharge space, and the shape of the partition wall 213 may be formed in various shapes such as a stripe shape and a matrix shape although not shown in the drawing.

An address electrode 211 extending on the upper surface of the first substrate 210 to cross the extending direction of the first electrode 221 and the second electrode 222 is disposed. The address electrode 211 is filled by the third dielectric layer 212, and the third electrodes 231r, 231g and 231b are disposed on the top surface of the third dielectric layer 212, and the top surfaces of the third electrodes 231r, 231g and 231b. An electron acceleration layer 240 for emitting a plurality of electrons into the cell is formed in the cell, and the third electrodes 231r, 231g and 231b and the electron acceleration layer 240 are filled by the first dielectric layer 226. Since the electron acceleration layer 240 emits a plurality of electrons into the cell, it is preferable that one surface of the electron acceleration layer 240 is drawn into the cell. The electron acceleration layer 240 may apply any material capable of accelerating electrons to generate electrons. That is, the electron acceleration layer 240 may be made of oxidized porous silicon, wherein the oxidized porous silicon includes oxidized porous polysilicon or oxidized porous amorphous silicon. Is illustrated. In addition, the electron acceleration layer 240 has a metal insulator metal (MIM) structure, a surface conduction emission emitter display (SED) structure, a boron nitride bamboo shoot (BNBS) structure, and a carbon nano tube (CNT). It may be either.

In each cell, any one of a red light emitting layer 215r, a green light emitting layer 215g, and a blue light emitting layer 215b is disposed, and in the drawing, the light emitting layers are disposed on a lower surface of the protective film 224. The present invention is not limited thereto, and may be disposed on a side surface of the partition wall 213 or an upper surface of the first substrate 210, in detail, on an upper surface of the first dielectric layer 226. Cells coated with the red emitter layer 215r are red cells 214r, cells coated with the green emitter layer 215g are green cells 214g, and cells coated with the blue emitter layer 215b are blue cells 214b. It is defined as. Therefore, the pixel Px, which is the minimum unit for implementing one image, is composed of the red cell 214r, the green cell 214g, and the blue cell 214b.

The cell may be filled with a gas including any one of neon, helium, and argon, including xenon, or a mixture thereof. Nitrogen (N2), deuterium, carbon dioxide (CO ₂ ), hydrogen (H ₂ ) and carbon monoxide (CO) may also be filled. The gas may act as a discharge gas, and may also act as an excitation gas that is excited by external energy such as electrons to generate ultraviolet rays.

Meanwhile, in FIG. 6, the first electrode 221 and the second electrode 222 are disposed on the rear surface of the second substrate 220, and the third electrodes 231r, 231g, and 231b are upper surfaces of the first substrate 210. In more detail, although illustrated as being disposed on the upper surface of the third dielectric layer 212, the position of each electrode is not limited thereto. For example, the first electrode 221 and the second electrode 222 may be disposed in the partition wall 213, and the third electrodes 231r, 231g and 231b may be the partition wall 213 or the second substrate 220. It will also be possible to place it on

The display device of FIG. 6 may be driven by the driving signal illustrated in FIG. 4 or 5. That is, hereinafter, the first electrode 221 is referred to as the sustain electrode X, and the second electrode 222 is also referred to as the scan electrode Y. When an alternating voltage is applied to the scan electrode Y and the sustain electrode X, a pulse is applied to the third electrodes 231r, 231g, and 231b while the red and green cells 214r and green cells 214g are applied. And a pulse application period or the number of pulses applied to each of the third electrodes 231r, 231g, and 231b of the blue cell 214b varies depending on the luminance characteristics of each light emitting layer in the red cells, the green cells, and the blue cells. . That is, the better the luminance characteristic, the shorter the application period of the pulse or the smaller the number of pulses. As described above, the application period or the number of pulses applied to each of the third electrodes 231r, 231g, and 231b is varied according to the luminance characteristics of each of the light emitting layers 215r, 215g, and 215b. The electrons emitted from the control panel can be controlled, and thus, the visible light of uniform brightness can be emitted to each cell as a whole. On the other hand, since the discharge can be easily performed using the electron acceleration layer 240, it is possible to lower the potential level of the AC voltage applied to the scan electrode (Y) and the sustain electrode (X), and improve the luminous efficiency. have.

On the other hand, in the driving signal shown in Fig. 4 or 5, in the driving of the plasma display panel, a reset period for initializing all cells, an address period for selecting a cell to be turned on among all cells, and sustain discharge are performed in the selected cell. It is a drive signal in a sustain period among the sustain periods. Meanwhile, in the address period, in order to select a cell to be turned on, each driving voltage may be applied between the address electrode A and the scan electrode Y to perform address discharge. A pulse as shown in 4 or 5 may be applied.

According to the present invention as described above, the following effects can be obtained.

First, since the display device includes the electron acceleration layer, the driving voltage can be lowered and the light emission efficiency can be improved as compared with the conventional plasma display panel.

Second, considering the luminance characteristics of the visible light generated by being excited in the light emitting layer for each of the red, green, and blue light emitting layers, different pulse application periods or number of pulses are applied to the third electrode under the electron acceleration layer. Therefore, visible light of uniform luminance is emitted from the red cells, the green cells, and the blue cells including the red, green, and blue light emitting layers, respectively.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (16)

A first substrate and a second substrate disposed to face each other to form a plurality of cells therebetween; A plurality of first electrodes and second electrodes spaced apart from each other between the first substrate and the second substrate; A plurality of third electrodes disposed between the first substrate and the second substrate; An electron acceleration layer formed on the third electrode and configured to emit a plurality of electrons into the cell as a pulse voltage is applied to the third electrode; A gas filled in the cell and excited by the electrons emitted from the electron acceleration layer to generate ultraviolet rays; And And a light emitting layer disposed inside the cell and excited by the ultraviolet light to generate visible light. The light emitting layer is composed of a red, green and blue light emitting layer, each cell is any one of the red, green and blue light emitting layer is disposed, And an application period of the pulse voltage applied to each of the cells is varied according to luminance characteristics of the visible light of the red, green, and blue light emitting layers. The method of claim 1, A display device having a shorter application period of the pulse voltage as a cell including a light emitting layer having good luminance characteristics among the red, green, and blue light emitting layers. The method of claim 2, The luminance characteristics of the red, green, and blue light emitting layers are referred to as Lr, Lg, and Lb, respectively, and the application period of the pulse voltage applied to the red, green, and blue light emitting layers is Tr, Tg, and Tb, respectively. If the luminance characteristic of each light emitting layer is Lr = Lg> Lb, the application period of the pulse voltage is Tr = Tg <Tb. The method of claim 1, The first electrode and the second electrode are disposed on the second substrate. The method of claim 1, The third electrode is disposed on the first substrate. The method of claim 1, The first electrode and the second electrode extend in parallel with each other. The method of claim 6, And an address electrode disposed between the first substrate and the second substrate and extending to cross a direction in which the first electrode and the second electrode extend. The method of claim 7, wherein The address electrode is disposed on the first substrate. A first substrate and a second substrate disposed to face each other to form a plurality of cells therebetween; A plurality of first electrodes and second electrodes spaced apart from each other between the first substrate and the second substrate; A plurality of third electrodes disposed between the first substrate and the second substrate; An electron acceleration layer formed on the third electrode and configured to emit a plurality of electrons into the cell as a pulse is applied to the third electrode; A gas filled in the cell and excited by the electrons emitted from the electron acceleration layer to generate ultraviolet rays; And And a light emitting layer disposed inside the cell and excited by the ultraviolet light to generate visible light. The light emitting layer is composed of a red, green and blue light emitting layer, each cell is any one of the red, green and blue light emitting layer is disposed, And a number of the pulses applied to the cells in accordance with the luminance characteristics of the visible light of the red, green, and blue light emitting layers. The method of claim 9, A display device having a smaller number of pulses as a cell including a light emitting layer having good luminance characteristics among the red, green, and blue light emitting layers. The method of claim 10, The luminance characteristics of the red, green, and blue light emitting layers are referred to as Lr, Lg, and Lb, respectively, and when the number of pulses applied to the red, green, and blue light emitting layers is Nr, Ng, and Nb, respectively, If the luminance characteristic of the layer is Lr = Lg> Lb, the number of pulses is Nr = Ng <Nb. The method of claim 9, The first electrode and the second electrode are disposed on the second substrate. The method of claim 9, The third electrode is disposed on the first substrate. The method of claim 9, The first electrode and the second electrode extend in parallel with each other. The method of claim 14, And an address electrode disposed between the first substrate and the second substrate and extending to cross a direction in which the first electrode and the second electrode extend. The method of claim 15, The address electrode is disposed on the first substrate.

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