KR20070059517A - Electron emission device and electron emission display device using thereof and driving method the same - Google Patents

Abstract

An electron emission device and an electron emission display device using the same, and a driving method thereof are provided to suppress abnormal emission by maintaining a constant temperature difference between upper and lower substrates. A first substrate(10) includes a cathode electrode(11), an insulating layer(12), and an electron emission region(14). A second substrate(16) includes a pixel, which includes plural phosphors(18). A spacer(15) is formed between the first and second substrates to maintain a predetermined distance. First and second temperature sensors contact with the first and second substrates, respectively. A comparator, which is connected to the first and second temperature sensors, compares the temperature of the first and second substrates. A heater heats the second substrate according to the compared result from the comparator.

Description

Electron emission device and electron emission display device using same, and driving method thereof {Electron emission device and electron emission display device using pretty and driving method the same}

1 is a view showing a conventional electron emission display device.

2 is a view showing an example of an electron emitting device according to the present invention.

3 is a view showing an example of an electron emission display device according to the present invention.

4 is a view showing a method of manufacturing an electron emission display device according to the present invention.

*** Description of the main symbols in the drawing **

100,200: first substrate 110,207: second temperature sensor

106,201: second substrate 111,208: comparison unit

109,206: first temperature sensor 112,209: heating part

106a, 201a: heating wire

The present invention relates to an electron emission device, an electron emission display device using the same, and a driving method thereof, and more particularly, an electron emission device for heating a top substrate to maintain a constant temperature between the top substrate and the bottom substrate; An electron emission display device using the same, and a driving method thereof.

Recently, a flat panel display such as a liquid crystal display (LCD), a plasma display panel (PDP), an electroluminescent display (ELD), an electron emission display (EED), or the like. Is actively being researched and developed. Among these, the electron emission display device includes an electron emission region for emitting electrons having an electron emission element, and an image expression region for emitting light by colliding the emitted electrons with a fluorescent layer. In particular, an electron emission display device using carbon nanotubes has advantages of a cathode ray tube (CRT) having excellent image characteristics such as high definition, high resolution, and wide viewing angle, and a flat panel display characterized by light weight, thinness, and low power consumption. It is an ideal display device that combines bays. In general, an electron emission device has a method using a hot cathode and a cold cathode as an electron source. The electron-emitting devices using the cold cathode are FEA (Field Emitter Array) type, SCE (Surface Conduction Emitter) type, MIM (Metal-Insulator-Metal) type, MIS (Metal-Insulator-Semiconductor) type, BSE (Ballistic) electron surface emitting) and the like are known.

The FEA type electron emitting device uses a low work function or high β function as an electron emission source, and uses electrons to emit electrons by electric field in vacuum. In addition, devices using electron emission sources for nanomaterials have been developed.

The SCE type electron emission device is a device in which an electron emission part is formed by providing a conductive thin film between two electrodes disposed to face each other on a substrate and providing a micro crack in the conductive thin film. The device utilizes a principle that electrons are emitted from the electron emission portion, which is the fine gap, by applying a voltage to an electrode to flow a current to the surface of the conductive thin film.

The MIM and MIS electron-emitting devices each form an electron emission portion formed of a metal-dielectric layer-metal (MIM) and metal-dielectric layer-semiconductor (MIS) structure, and are disposed between two metals or metals and semiconductors having a dielectric layer therebetween. When a voltage is applied to the device, a device using the principle of emitting electrons while moving and accelerating from a metal having a high electron potential or a metal having a low electron potential toward the metal.

The BSE type electron emitting device forms an electron supply layer made of a metal or a semiconductor on an ohmic electrode by using the principle that electrons travel without scattering when the size of the semiconductor is reduced to a dimension area smaller than the average free stroke of electrons in the semiconductor. And an insulating layer and a metal thin film formed on the electron supply layer to emit electrons by applying power to the ohmic electrode and the metal thin film.

Like the Cathode-Ray Tube (CRT), the electron-emitting device operates by cathode polarization (self-light source, high efficiency, high luminance and wide luminance region, natural color and high color purity, wide viewing angle), and operating speed. Due to the advantages of lighting, the operating temperature range is wide, it can be used in various fields, and active research has been made until recently.

1 is a view showing a conventional electron emission display device.

Referring to FIG. 1, a conventional electron emission display device includes a first substrate 10, a cathode electrode 11, an insulating layer 12, a gate electrode 13, an electron emission region 14, and a spacer 15. And a second substrate 16, an anode electrode 17, and a fluorescent layer 18.

At least one cathode electrode 11 is arranged on the first substrate 10 in a predetermined shape, for example, on a stripe. The first substrate 10 uses a photosensitive carbon nanotube (CNT) paste as an electron emission device, and in the case of forming it by back exposure, a transparent substrate such as glass may be used.

The cathode electrode 11 supplies each data signal or scan signal applied from the data driver (not shown) or the scan driver (not shown) to each electron emission region 14. In addition, the cathode electrode 11 may be arranged side by side on the first substrate 10 in a stripe shape. At this time, the electron emission region 14 is formed in the region defined by the cathode electrode 11 and the gate electrode 13.

For example, the insulating layer 12 is formed between the cathode electrode 11 and the gate electrode 13 to electrically insulate the cathode electrode 11 and the gate electrode 13. In addition, the insulating layer 12 includes at least one first through hole 12a at an intersection area between the cathode electrode 11 and the gate electrode 13 so that one region of the cathode electrode 11 is exposed.

The gate electrode 13 is disposed on the insulating layer 12 in a predetermined shape, for example, in a direction crossing the cathode electrode 11 on a stripe, and each data signal or scan signal applied from the data driver or the scan driver. Is supplied to each pixel. In addition, the gate electrode 13 includes at least one second through hole 12b corresponding to the first through hole 12a so that one region of the cathode electrode 11 is exposed.

The electron emission region 14 is formed on the cathode electrode 11 exposed by the first through hole 12a of the insulating layer 12, and emits electrons when an electric field is applied, such as a carbon-based material or It is formed of any one selected from the group consisting of nanometer (nm) size material, carbon nanotubes, graphite (graphite), graphite nanofibers, diamond-like carbon, C ₆₀ , silicon nanowires. When an electric field is formed by the voltages applied to the cathode electrode 11 and the gate electrode 13, electrons are emitted from the electron emission region 14, and the emitted electrons are fluorescent layers corresponding to the electron emission region 14 ( 18) to display an image.

The spacer 15 is positioned between the first substrate 10 and the second substrate 16 to support the first substrate 10 and the second substrate 16 to prevent sagging.

The fluorescent layer 18 which emits light by the collision of electrons is selectively arranged in the 2nd board | substrate 16 at arbitrary intervals. At this time, the second substrate 16 is preferably made of a transparent material.

The anode electrode 17 is formed on the side facing the first substrate 10 of the second substrate 16, and is an electrode that accelerates electrons emitted from the electron emission region 14 to the fluorescent layer 18. At this time, the anode electrode 17 is preferably formed using a transparent material such as ITO.

The fluorescent layer 18 is disposed in an arbitrary shape (for example, a stripe shape, a matrix shape, etc.) at predetermined intervals on the side surface of the second substrate 16 facing the first substrate 10. The fluorescent layer 18 may be formed of a red luminescent fluorescent layer R, a green luminescent fluorescent layer G, and a blue luminescent fluorescent layer B. There is no restriction | limiting in particular in the fluorescent substance used for each fluorescent layer 18, The fluorescent substance conventionally used for the electron emission display apparatus can be used.

As described above, the conventional electron emission display device has a problem in that an abnormal emission phenomenon such as over- or under-emission occurs due to a temperature difference between the first substrate 10 and the second substrate 16, that is, the upper substrate and the lower substrate. . Since the abnormal light emission phenomenon depends on the relative temperature difference, not the absolute temperature, it is necessary to keep the temperature of the upper and lower substrates constant.

SUMMARY OF THE INVENTION An object of the present invention for solving the above problems is to provide an electron emission display device and a driving method thereof capable of maintaining a constant temperature difference between an upper substrate and a lower substrate to prevent abnormal light emission caused by the temperature difference. .

As a technical means for achieving the above object, one side of the present invention, the first substrate including a cathode electrode, an insulating layer and an electron emission region, a plurality of light emitting by the electrons emitted from the electron emission region A second substrate including a pixel portion provided with a phosphor, a spacer formed between the first substrate and the second substrate to maintain a predetermined distance between the first substrate and the second substrate, and connected to the first substrate A second temperature sensor connected to a first temperature sensor and the second substrate, a comparison unit connected to the first temperature sensor and the second temperature sensor and comparing a temperature between the first substrate and the second substrate; and It is to provide an electron emitting device comprising a heating unit for heating the second substrate in accordance with the result compared in the comparison unit.

According to another aspect of the present invention, a pixel includes a plurality of pixels in a region defined by a first substrate on which a plurality of scan lines and a plurality of data lines are formed, a plurality of scan lines, and a plurality of data lines, and an anode electrode is formed over the entire region. A second substrate including a portion, a scan driver for applying a scan signal to the plurality of scan lines, a data driver for applying a data signal to the plurality of data lines, and a first substrate, the drive temperature of the first substrate being adjusted. A first temperature sensor to be measured, a second temperature sensor connected to the second substrate and measuring a driving temperature of the second substrate, and a comparison unit comparing the temperature measured by the first temperature sensor and the second temperature sensor According to the result compared in the comparison unit, to provide an electron emission display device comprising a heating unit for heating the second substrate.

Another aspect of the present invention provides a driving temperature between a first substrate including a cathode electrode, an insulating layer, and an electron emission region on an upper portion thereof, and a second substrate including a pixel portion and a hot wire formed along the periphery of the pixel portion. It provides a method for driving an electron emission display device comprising the step of measuring, comparing the temperature of the first substrate and the temperature of the second substrate and heating the hot wire according to the comparison result.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described.

2 is a view showing an example of an electron emission display device according to the present invention.

Referring to FIG. 2, in the electron emission display device according to the present invention, the conventional electron emission display device includes a first substrate 100, a cathode electrode 101, an insulating layer 102, a gate electrode 103, and electron emission. Region 104, spacer 105, second substrate 106, anode electrode 107, fluorescent layer 108, first temperature sensor 109, second temperature sensor 110, comparator 111 And a heating part 112.

At least one cathode electrode 101 is disposed on the first substrate 100 in a predetermined shape, for example, on a stripe. The first substrate 100 uses a photosensitive CNT (Carbon NanoTube) paste as an electron emission device, and when forming the substrate by back exposure, a transparent substrate such as glass may be used.

The cathode electrode 101 supplies each data signal or scan signal applied from the data driver (not shown) or the scan driver (not shown) to each electron emission region 104. In this case, the electron emission region 104 is formed in the region defined by the cathode electrode 101 and the gate electrode 103.

The insulating layer 102 is formed on the first substrate 100 and the cathode electrode 101, and electrically insulates the cathode electrode 101 and the gate electrode 103 from each other. In addition, the insulating layer 102 includes at least one first through hole 102a at an intersection of the cathode electrode 101 and the gate electrode 103 so that one region of the cathode electrode 101 can be exposed.

The gate electrode 103 is disposed on the insulating layer 102 in a predetermined shape, for example, in a direction crossing the cathode electrode 101 on a stripe, and each data signal or scan signal applied from the data driver or the scan driver. Is supplied to each pixel. In addition, the gate electrode 103 includes at least one second through hole 102b corresponding to the first through hole 102a so that one region of the cathode electrode 101 is exposed.

The electron emission region 104 is formed on the cathode electrode 101 exposed by the first through hole 102a of the insulating layer 102, and emits electrons when an electric field is applied, such as a carbon-based material or It is formed of any one selected from the group consisting of nanometer (nm) size material, carbon nanotubes, graphite (graphite), graphite nanofibers, diamond-like carbon, C ₆₀ , silicon nanowires. When an electric field is formed by the voltages applied to the cathode electrode 101 and the gate electrode 103, electrons are emitted from the electron emission region 104, and the emitted electrons are formed in a fluorescent layer corresponding to the electron emission region 104. 108) to display an image.

The spacer 105 is positioned between the first substrate 100 and the second substrate 106 to support the first substrate 100 and the second substrate 106 so that sag does not occur.

The fluorescent layer 108 which emits light by the collision of electrons is selectively arranged in the 2nd board | substrate 106 at arbitrary intervals. At this time, the second substrate 106 is preferably made of a transparent material.

The anode electrode 107 is formed on the side facing the first substrate 100 of the second substrate 106, and is an electrode that accelerates electrons emitted from the electron emission region 104 to the fluorescent layer 108. In this case, the anode electrode 107 is preferably formed using a transparent material such as ITO.

The fluorescent layer 108 is disposed in an arbitrary shape (for example, a stripe shape, a matrix shape, etc.) at predetermined intervals on the side surface of the second substrate 106 facing the first substrate 100. The fluorescent layer 108 may be formed of a red luminescent fluorescent layer R, a green luminescent fluorescent layer G, and a blue luminescent fluorescent layer B.

The first temperature sensor 109 is connected to the first substrate 100 to measure the driving temperature of the first substrate 100, and transmits information about the measured temperature to the comparator 111.

The second temperature sensor 110 is connected to the second substrate 106 to measure the driving temperature of the second substrate 106, and transmits information about the measured temperature to the comparator 111.

The comparator 111 compares the temperatures of the first substrate 100 and the second substrate 106 measured by the first temperature sensor 109 and the second temperature sensor 110, and the first substrate 100. The signal corresponding to the temperature difference of the second substrate 106 is transmitted to the heating part 112.

The heating unit 112 receives a signal corresponding to the temperature difference between the first substrate 100 and the second substrate 106 from the comparator 111, and the heating wire 106a formed on the second substrate 106. The current corresponding to the temperature difference between the first substrate 100 and the second substrate 106 is applied to the. That is, as the temperature difference between the first substrate 100 and the second substrate 106 increases, the amount of current applied to the hot wire 106a is increased. Accordingly, since the second substrate 106 is heated to increase the temperature, the temperature difference between the first substrate 100 and the second substrate 106 can be kept constant.

3 is a view showing an example of an electron emission display device according to the present invention.

Referring to FIG. 3, the electron emission display device according to the present invention includes a first substrate 200, a second substrate 201, a pixel portion 202, a scan driver 203, a data driver 204, a power supply. And a supply unit 205, a first temperature sensor 206, a second temperature sensor 207, a comparator 208, and a heating unit 209.

A plurality of scan lines S1, S2,... Sn and a plurality of data lines D1, D2, ... Dm are formed on the first substrate 200, and one of the scan lines and the data lines serves as a cathode electrode. The other acts as the gate electrode.

The second substrate 201 includes a plurality of pixels 202a in a region defined by a plurality of scan lines and a plurality of data lines, and includes a pixel portion 202 in which an anode electrode ANODE is formed over the entire region. .

The scan driver 203 applies a scan signal to the plurality of scan lines S1, S2, ... Sn.

The data driver 204 applies a data signal to the plurality of data lines D1, D2, ... Dm.

The power supply unit 205 supplies the first power source V1 and the second power source V2 to the scan driver 203, and supplies the third power source V3 and the fourth power source V4 to the data driver 204. do.

The first temperature sensor 206 is connected to the first substrate 200 to measure the driving temperature of the first substrate 200, and transmits information about the measured temperature to the comparator 208.

The second temperature sensor 207 is connected to the second substrate 201 to measure the driving temperature of the second substrate 201, and transmits information about the measured temperature to the comparator 208.

The comparison unit 208 compares the temperatures of the first substrate 200 and the second substrate 201 measured by the first temperature sensor 206 and the second temperature sensor 207, and the first substrate 200. The signal corresponding to the temperature difference of the second substrate 201 is transmitted to the heating unit 209.

The heating unit 209 receives a signal corresponding to the temperature difference between the first substrate 200 and the second substrate 201 from the comparator 208, and forms the heating wire 201a formed on the second substrate 201. The current corresponding to the temperature difference between the first substrate 200 and the second substrate 201 is applied to the. That is, as the temperature difference between the first substrate 200 and the second substrate 201 increases, the amount of current applied to the hot wire 201a is increased. Accordingly, since the second substrate 201 is heated to increase the temperature, the temperature difference between the first substrate 200 and the second substrate 201 can be kept constant.

4 is a view showing a method of manufacturing an electron emission display device according to the present invention.

Referring to FIG. 4, the method of manufacturing the electron emission display device according to the present invention is performed in the first step ST100 to the third step ST300.

The first step ST100 measures a driving temperature between a first substrate including a cathode electrode, an insulating layer, and an electron emission region on an upper portion thereof, and a second substrate including a pixel portion and a hot wire formed along the periphery of the pixel portion. It's a step.

The second step ST106 is a step of comparing the temperature of the first substrate with the temperature of the second substrate.

The third step ST300 is a step of heating the hot wire according to the result compared in the second step ST200. That is, the temperature difference between the first substrate and the second substrate is measured, and the second substrate is heated according to the measured result. At this time, as the measured temperature difference between the first substrate and the second substrate increases, the amount of current applied to the heating wire formed on the second substrate also increases. Generally, since the temperature of the first substrate is lower than that of the second substrate, when the temperature difference between the first substrate and the second substrate is not constant, the second substrate may be adjusted so that the temperature difference between the first substrate and the second substrate has a constant value. Should increase the temperature. In order to increase the temperature, an amount of current required to increase a predetermined temperature is applied to a heating wire having a resistance formed along the outer edge of the pixel portion included in the second substrate. In other words, the more the current flows, the higher the temperature of the second substrate can be.

Although the technical idea of the present invention has been described in detail according to the above preferred embodiment, it should be noted that the above-described embodiment is for the purpose of description and not of limitation. In addition, it will be understood by those skilled in the art that various modifications are possible within the scope of the technical idea of the present invention.

According to the electron emission device according to the present invention, an electron emission display device using the same, and a driving method thereof, the abnormal light emission phenomenon caused by the temperature difference between the upper substrate and the lower substrate by keeping the temperature difference between the upper substrate and the lower substrate constant Can be suppressed.

Claims (8)

A first substrate including a cathode electrode, an insulating layer, and an electron emission region thereon; A second substrate including a pixel portion including a plurality of phosphors emitting light by electrons emitted from the electron emission region; A spacer formed between the first substrate and the second substrate to maintain a predetermined distance between the first substrate and the second substrate; A first temperature sensor connected to the first substrate and a second temperature sensor connected to the second substrate; A comparison unit connected to the first temperature sensor and the second temperature sensor and comparing a temperature between the first substrate and the second substrate; And An electron emission device including a heating unit for heating the second substrate in accordance with the result compared in the comparison unit. The method of claim 1, And a heat ray formed on the second substrate along the periphery of the pixel portion. The method of claim 2, The heating unit applies an electric current to the heating wire to heat the second substrate. A first substrate on which a plurality of scan lines and a plurality of data lines are formed; A second substrate having a plurality of pixels in a region defined by a plurality of scan lines and a plurality of data lines, the second substrate including a pixel portion in which an anode electrode is formed over the entire region; A scan driver which applies a scan signal to the plurality of scan lines; A data driver for applying a data signal to the plurality of data lines; A first temperature sensor connected to the first substrate and measuring a drive temperature of the first substrate; A second temperature sensor connected to the second substrate and measuring a driving temperature of the second substrate; A comparison unit comparing the temperature measured by the first temperature sensor and the second temperature sensor; And a heating unit for heating the second substrate according to the result compared in the comparison unit. The method of claim 4, wherein And a heat ray formed on the second substrate along the periphery of the pixel portion. The method of claim 5, And the heating unit heats the second substrate by applying a current to the heating wire. Measuring a driving temperature between a first substrate including a cathode electrode, an insulating layer, and an electron emission region thereon, and a second substrate including a pixel portion and a hot wire formed along an outer edge of the pixel portion; Comparing the temperature of the first substrate with the temperature of the second substrate; And And heating the hot wire according to the compared result. The method of claim 7, wherein And heating the hot wire is applying a current corresponding to the compared temperature difference to the hot wire.

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