CN1206694C - Method for lowering dynamic region of modulated voltage for display screen of field emission - Google Patents

Abstract

The present invention relates to a method which relates to a field emission device and a field emission displaying device for reducing a dynamic region of the modulated voltage of a field emission displaying screen, particularly to a method for reducing the dynamic region of the field emission modulated voltage by changing the structure of the field emission device. An electron inlet end which is used as a hole or a groove of an electron passage is staggered in a distance from an electron outlet end in the vertical direction of a dielectric plate to form an inclined hole or groove to cause incident electrons can not directly pass through the hole or the groove. The electrons hit the wall of the hole or the groove to generate secondary electrons of which the number passing through the hole or the groove is modulated under the action of the modulated voltage exerted on a modulation electrode. Because the secondary electrons has low energy, electrons which are emitted can be modulated by controlling the electric potential at the outlet end of the medium surface. The varying range of the current modulation voltage is correspondingly lower than the range of the modulation voltage of a door electrode so as to achieve the goal of reducing the modulation voltage.

Description

Reduce the method for Field Emission Display screen modulation voltage dynamic range

One, technical field

The present invention relates to feds, field emission display, particularly reduce a method of emission modulation voltage dynamic range by the structure that changes feds.

Two, background technology

Feds is developed recently research field rapidly, particularly the application in the Field Emission Display field is a focus of present flat-panel monitor development, the more flat-panel monitor of comparative studies has LCD, plasma scope, Field Emission Display or the like at present, LCD is because be passive luminous, so brightness is lower, there is the problem that the visual angle is little, response speed is slow simultaneously; The plasma scope large scale shows, but acquires a certain degree of difficulty in luminous efficiency and high-resolution demonstration; And Field Emission Display is the flat-panel display device of a kind of cold cathode emission, active illuminating, have luminosity height, low in energy consumption, characteristics such as the visual angle big, suitable high-resolution demonstration, therefore to the research of feds very active always, the particularly appearance of carbon nano-tube material in recent years, make that but the printing-type field emission display becomes possibility, have vast potential for future development.It comprises a front glass substrate and a parallel relative back glass substrate with front glass substrate that effectively shows working face as this display device a kind of typical Field Emission Display plate; Be provided with many cathode electrodes that are parallel to each other and position on the glass substrate in the back thereon and keep the little sharp type cold cathode electron emitter that is electrically connected: electronic emitter is beginning emitting electrons when its electric field reaches certain intensity under the control of the gate electrode corresponding with it, emission current increases with the increase of electric field strength; Electrons emitted is quickened in anode under the effect that is positioned at the transparent conductive anode on the prebasal plate, the configuration that is orthogonal of anode and negative electrode; And on the phosphor material powder of prebasal plate, make light-emitting phosphor by bombardment behind the vacuum space, anode that light can be by electrically conducting transparent and front glass substrate and can be in sight.Isolate for the electricity that guarantees gate electrode and cathode electrode, between gate electrode and cathode electrode, insulating medium layer is arranged, between each cathode electrode, dielectric isolation is arranged.Entire device is sealed into vacuum tank by vacuum seal with forward and backward glass substrate, and to make device inside by gas extraction system be vacuum.For glass substrate before and after making can bear pressure differential between external pressure and the inner vacuum, also be manufactured with medium at interval at device inside, glass substrate before and after being used for supporting.

Field emission display is when work, between gate electrode and negative electrode, add certain voltage, make the field intensity of little sharp emitter tip enough strong, so that can make little sharp emitter tip emitting electrons, voltage between change gate electrode and the negative electrode can be controlled the intensity of little sharp reflector emitting electrons, therefore, generally with the brightness of gate electrode as modulator electrode control Field Emission Display.Therefore electrons emitted impact fluorescence powder and make it luminous under the effect of anode voltage because little sharp size is very little, can realize that high-resolution shows; Because Field Emission Display is the flat panel display of electron bombard fluorescent material, so luminosity can be very high, and what the visual angle also can be very is big.

Field emission display is because gate electrode powers up the bit comparison height, and the dynamic range of modulation voltage is bigger, and therefore relatively difficult in actual applications, the integrated chip price is expensive, and the drive circuit cost is than higher.For fear of the excessive problem of voltage modulated scope, in Field Emission Display, adopt the modulator approach of pulse duration, but this has limited the tonal gradation in showing.Therefore the modulation voltage that how to reduce field emission display is to need the problem that overcomes in the field emission display.

Three, technology contents

1, technical problem

The purpose of this invention is to provide a kind of migration, reach the method for the reduction Field Emission Display screen modulation voltage dynamic range that reduces the modulation voltage purpose by control medium surface secondary electron.

2, technical scheme

The method of reduction Field Emission Display screen modulation voltage dynamic range of the present invention, this method is to have hole or groove as the dielectric-slab of electron channel and manufacture modulator electrode at the port of export with one, be placed in the display screen inner space of anode motion of cathode electronics reflector institute emitting electrons, as the electronics arrival end of the hole of electron channel or groove and the electronics port of export in the displacement of staggering of the vertical direction of dielectric-slab, form an oblique hole or groove, make incident electron can not directly pass through hole or groove, electronics is beaten on the wall of hole or groove and is produced secondary electron, secondary electron its number of electrons by hole or groove under the effect of the modulation voltage that applies on the modulator electrode is modulated, the dielectric-slab that has hole or groove can be perforate or a groove on dielectric material, also can be on the metal plate that has hole or groove, to make dielectric layer to obtain, the voltage that applies on the modulator electrode, when it is higher than a certain threshold potential, the electronics that enters arrival end can all arrive the port of export by hole or groove, when it is lower than threshold potential, enter the electronic section of arrival end or all can not arrive the port of export, the arrival end of hole or groove can be identical with the size of the port of export, also can be different, be to increase the utilization ratio of electronics, generally bigger with the size design of arrival end than port of export size.

The invention provides a kind of modulating electrode structure of novel Field Emission Display plate, this structure can be applied in the vacuum electron device of dynamic reference voltage that all kinds of field emission displays and other need reduce current-modulation.

3, technique effect is because the electron bombard insulating material surface of certain energy, can produce secondary electron, secondary electron can form the secondary of continuous jump and moves to the high potential direction under certain electric field action at dielectric surface, the energy of face secondary electron passes through many that the initial electron energy of gate electrode will be low relatively, therefore can make initiating electron bombard dielectric surface and produce secondary electron, because the energy of secondary electron is lower, current potential by the control medium surface port of export, can modulate electrons emitted, the excursion of modulation voltage at this moment will be much lower with respect to the voltage range of gate electrode modulation, thereby reach the purpose that reduces modulation voltage.

Four, description of drawings

Fig. 1 is a kind of structural representation of typical field emission display.Front glass substrate 1, back glass substrate 2, cathode electrode 3, cathode electronics reflector 4, gate electrode 5, transparent conductive anode 6, phosphor material powder 7, insulating medium layer 8, medium 9, vacuum seal 10, medium interval 11 are wherein arranged.

Fig. 2 is the structural representation of feds modulator electrode of the present invention.Dielectric-slab 12, hole or groove 13, electronics arrival end 14, the electronics port of export 15, incident electron 16, wall 17, modulator electrode 18 are wherein arranged

Fig. 3 is produced on structural representation in the field emission display with modulator electrode.Cathode electrode 19, an emission tip 20, gate electrode 21, medium interval 22, line scanning electrode 23, anode phosphor screen 24 are wherein arranged.

Fig. 4 is as the effect that reduces electron energy with the modulation electric pole plate of figure three.Dielectric layer 25, row electrode 26 are wherein arranged.

Fig. 5 is that electron source is the schematic diagram of the field emitting electronic source of common door electrode.

Fig. 6 is the schematic diagram of the electron source of gate electrode below negative electrode.

Five, specific embodiments

A kind of method that reduces Field Emission Display screen modulation voltage dynamic range, it comprises that one has hole or groove as the dielectric-slab of electron channel and manufacture at the modulator electrode of the port of export and form, it is characterized in that as the electronics arrival end 14 of the hole of electron channel or groove 13 and the electronics port of export 15 in the displacement of staggering of the vertical direction of dielectric-slab 12, form an oblique hole or groove 13, make incident electron 16 can not directly pass through hole or groove 13, electronics is beaten on the wall 17 of hole or groove 13 and is produced secondary electron, secondary electron its number of electrons by hole or groove 13 under the effect of the modulation voltage that applies on the modulator electrode 18 is modulated, the dielectric-slab 12 that has hole or groove can be perforate or a groove 13 on dielectric material, also can be on the metal plate that has hole or groove, to make dielectric layer 12 to obtain, the voltage that applies on the modulator electrode 18, when it is higher than a certain threshold potential, the electronics that enters arrival end 14 can all arrive the port of export 15 by hole or groove 13, when it is lower than threshold potential, enter the electronic section of arrival end 14 or all can not arrive the port of export 15, the arrival end 14 of hole or groove 13 can be identical with the size of the port of export 15, also can be different, be to increase the utilization ratio of electronics, generally the ratio port of export 15 sizes with the size design of arrival end 14 are big.

In structure of the present invention, employing is in the tilt method of perforate or groove 13 of media plate 12, make the displacement of on direction, staggering of the incident port one 4 of electronics and exit ports 15 perpendicular to media plate, as shown in Figure 2, the electronics 16 of incident end is at first beaten on hole wall on the media plate or cell wall 17 produced secondary electron, avoided primary electron directly to pass the hole simultaneously or groove causes the inhomogeneous of Electron energy distribution.Exit ports at electronics is made modulator electrode 18, applies certain voltage on modulator electrode, and the control secondary electron reaches the purpose that reduces electron beam energy and reduce electron stream modulation voltage dynamic range by the number of hole or groove.

Claims (4)

1, a kind of method that reduces Field Emission Display screen modulation voltage dynamic range, it is characterized in that this method is to have hole or groove as the dielectric-slab of electron channel and manufacture modulator electrode at the port of export with one, be placed in the display screen inner space of anode (24) motion of cathode electronics reflector (4) institute emitting electrons, as the electronics arrival end (14) of the hole of electron channel or groove (13) and the electronics port of export (15) in the displacement of staggering of the vertical direction of dielectric-slab (12), form an oblique hole or groove (13), make incident electron (16) can not directly pass through hole or groove (13), electronics is beaten in the hole or the wall (17) of groove (13) is gone up the generation secondary electron, and secondary electron its number of electrons by hole or groove (13) under the effect of the modulation voltage that applies on the modulator electrode (18) is modulated.

2, the method for reduction Field Emission Display screen modulation voltage dynamic range according to claim 1, it is characterized in that having the making of the dielectric-slab (12) and the modulator electrode (18) of hole or groove, be perforate or groove (13) on dielectric material, and then make modulator electrode thereon, or making dielectric layer (12) on the metal plate that has hole or groove obtains.

3, the method for reduction Field Emission Display screen modulation voltage dynamic range according to claim 1, it is characterized in that the voltage that applies on the modulator electrode (18), when it is higher than a certain threshold potential, the electronics that enters arrival end (14) all arrives the port of export (15) by hole or groove (13), when it is lower than threshold potential, enters the electronic section of arrival end (14) or all can not arrive the port of export (15).

4, the method for reduction Field Emission Display according to claim 1 screen modulation voltage dynamic range is characterized in that for increasing the utilization ratio of electronics, and the ratio port of export (15) size of the size design of arrival end (14) is big.

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