CN101042980A - Field emission devices high efficiency high-field emission face light source device - Google Patents
Field emission devices high efficiency high-field emission face light source device Download PDFInfo
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- CN101042980A CN101042980A CN 200610038985 CN200610038985A CN101042980A CN 101042980 A CN101042980 A CN 101042980A CN 200610038985 CN200610038985 CN 200610038985 CN 200610038985 A CN200610038985 A CN 200610038985A CN 101042980 A CN101042980 A CN 101042980A
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Abstract
The invention relates to a high efficiency field-emission surface light source device. It includes following parts: the anode electrode whose thickness is above the high pressure input efficiency and reflection efficiency design standard is formed on the lower glass base board by the low resistance and good reflection effect; fluorophor layer which is formed on said anode electrode; electron sending device which is separated with said fluorophor layer; transparent cathode electrode which mounts said electron sending device; upper glass base board which forms said transparent cathode electrode. The invention increases the luminous effect, the manufacture is easy, so the cost is decreased, and the electron property of the anode electrode is upward, the power consumption efficiency is not only increased, but also the reliability generated by heating can be resolved.
Description
Technical field
The present invention relates to a kind of field emission devices high efficiency high-field emission face light source device, be particularly related to and a kind ofly will emit the electronics of emitting the source as fluorophor from electronics, make the structural change of carrying out luminous field emission area source, thereby improve the field emission devices high efficiency high-field emission face light source device of effect greatly.
Background technology
Recently, various display devices are developed, and the importance of light source also is enhanced.These light sources are with the filament heating, utilize gas discharge, utilize the whole bag of tricks such as light-emitting phosphor.These light sources can only use as simple lighting apparatus, but the display backlights such as LCD of making the area source form also can be used.
The backlight main use of this LCD can improve the cold-cathode tube (Cold Cathode Fluorescent Lamp:CCFL) of very high gray scale and uniform light-emitting zone.This cold-cathode tube mainly is to be coated with at the glass tube inner face to spread fluorescent material, after the both sides of the glass tube end forms electrode, will make in inert gas and the mercury inclosure lamp.Simultaneously, if to the two ends of lamp input voltage, just the electronics that exists in the above-mentioned glass tube moves to electrode at a high speed, the while is because 2 electronics that the conflict of electrode and electronics generates begin discharge, the electronics of dispersing out in the electrode conflicts with mercury atom, produces ultraviolet ray from mercury.On the fluorophor that above-mentioned ultraviolet irradiation is smeared to the glass tube inner face, generate visible rays.
But this CCFL just requires to have brighter gray scale and the efficient of Geng Gao, thereby brings restriction to use along with the maximization that becomes of the size of LCD.Simultaneously, from field of environment protection, because the use of mercury more and more is restricted, so when not using mercury, just require to use the new area source that has the efficient of better gray scale than CCFL.
In this new area source, utilize size, gray scale and the efficient of the area source of field emission (Field Emission:FE) all to show up prominently.The method of this field emission is as using field emission apparatus, after the electric field that forms various forms is emitted the source, emit the electronics of emitting the source from above-mentioned electric field and conflict to the fluorophor on opposite, thus can be luminous, by fairly simple formation, can obtain the light source of high gray scale.
Fig. 1 is the sectional view that shows original field emission planar light source device structure.As shown in the figure, on lower glass substrate 10, form cathode electrode 20, form electronics in the above and emit source 30.Simultaneously, utilize process especially, form anode electrode 50 on the top glass substrate 40, thereby can import high voltage, form the fluorescence portion 60 that forms by fluorophor 61, emulsion 62, reflective metal layer (metal back) 63 in the above.After this, above-mentioned lower plate portions is relative with upper board part arranges (by supports such as idle bar and frit (not shown)), finishes field emission area source structure.Above-mentioned electronics is emitted between source 30 and the fluorescence portion 60 and is kept vacuum.
What as everyone knows, above-mentioned electronics was emitted source 30 uses is little point (Micro Tip) type, metal edges (Metal Edge) type, carbon nano-tube (Carbon Nano Tube:CNT) type etc.
Above-mentioned field emission area source uses white light because have high gray scale and a high efficiency, and manufacturing price is lower, and does not use pollutant such as mercury, utilizes the guard ring border, so enjoy people to pay close attention to.
Certainly, above-mentioned structure as shown in the figure is anode electrode 50 input high voltages, be the diode form of direct ejected electron, but also can emit source 30 with above-mentioned electronics closes on the extra gate electrode, uses 3 electrode shapes.Structure as shown in the figure is the diode form, if, emit source 30 ejected electrons (dotted line) from above-mentioned electronics, the electronics penetration metal level 63 and the emulsion 62 of being emitted to above-mentioned anode electrode 50 input high voltages, shine on the fluorophor 61, produce luminous.The light that above-mentioned fluorophor 61 produces is emitted to above-mentioned anode electrode 50 and top glass substrate 40 directions, and the light that sends to above-mentioned reflective metal layer 63 directions is reflected on reflective metal layer 63, thereby has improved efficient.Above-mentioned reflective metal layer 63 is thick more, and reflection efficiency is high more, if thin more, light does not reflect more, can see through more, and here, above-mentioned X-ray emulsion X 62 is to spread upon on the fluorophor 62, makes the layer that above-mentioned reflective metal layer 63 can smooth formation.
What Fig. 2 was shown is with the LCD structural section figure of light-emitting area light supply apparatus among Fig. 1 as installation backlight.As shown in the figure, after the lower plate of formation field emission area source and the idle bar 70 of upper plate utilization and frit 75 are wrapped, LCD module 90 is installed in the above.For light diffusion uniformly, diffuser plate 80 or light prism (not shown) are installed again betwixt.Specifically, in this original structure, from the direct directive fluorescence of the electronics portion 60 that electronics discharge device 30 is emitted, so the part of electronics conflict is just bright, the part that electronics does not conflict is relatively black, so be difficult to see the state of whole uniformly light-emitting.Therefore, under most of situation,, must increase diffuser plate 80 again in order to obtain the uniformly light-emitting state.
As mentioned above, original field emission area source just uses the structure of electric field discharge device same as before, so in order to make the electronics of emitting arrive fluorophor by the electronics discharge device, must see through metal level and emulsion, so reduced efficient, in order to improve reflection efficiency, must increase its thickness as far as possible, the efficient that electronics sees through is just lower.Simultaneously, the fluorophor of electronics conflict is the fluorophor that is positioned at bottom, and the light that the bottom fluorophor produces must be emitted through the top of lap over fluorophor, so can produce light loss.Simultaneously, if electronics conflicts on fluorophor, just fluorophor generates heat, in original structure, the heat that is produced is emitted very difficult, so diffuser plate or LCD module that top forms can be out of shape because of heat.Simultaneously, for above-mentioned anode layer, because must see through light, so transparency electrode that can only the utilization ratio difference if import high-tension words, can produce power loss.
Summary of the invention
Field emission area source originally all is to form electronics to emit the source on infrabasal plate, emit on the upper substrate of light and form anode electrode, fluorophor and reflective metal layer, so above-mentioned anode electrode should be desirably transparent metal, current loss is many, the necessary penetration metal level of the electronics of emitting from the electronics source of emitting, arrive fluorophor, so there is the problem of inefficiency.Simultaneously, the light that sends from the fluorophor that the electronics conflict takes place must see through overlapping top fluorescence coating, so light has loss, and the gray scale step-down, very difficult structure is dispersed in the heating with fluorophor, so the heat that exists fluorophor to send makes the problem of device distortion.
To achieve these goals, the present invention has the feature that comprises following each several part: utilizing the metal that resistance is low, reflecting effect is good to form thickness at high voltage input efficiency and the anode electrode more than the reflection efficiency design standard on the lower glass substrate; The luminescent coating that on above-mentioned anode electrode, forms; The relative electronics discharge device that forms that separates with above-mentioned luminescent coating; The transparent cathode electrode of above-mentioned electronics discharge device is installed; Form the top glass substrate of above-mentioned transparent cathode electrode.
Above-mentioned electronics discharge device utilizes printing process, and printing forms to carbon nano-tube.
Close on the other gate electrode that on electricity, insulate with above-mentioned cathode electrode that comprises again with above-mentioned electronics discharge device.
Above-mentioned lower glass substrate bottom also comprises the heat liberation board that heat that above-mentioned fluorophor is sent is effectively dispersed.As mentioned above, has following effect according to field emission devices high efficiency high-field emission face light source device of the present invention: on lower plate, utilize resistance low, the metal that reflecting effect is high forms thick anode electrode, form fluorophor at an upper portion thereof, form cathode electrode and electronics discharge device from upper plate, the electronics that provides from the electronics discharge device sends the fluorophor on the lower plate and the light that reflects is emitted by above-mentioned upper plate, electronics can directly arrive fluorophor, simultaneously, make the light that is produced without another fluorescence coating, improved illumination effect, manufacturing process is very simple, thereby can reduce expense, and the characteristic electron of anode electrode is risen, thus the consumption electrical efficiency not only can be improved, and can solve by the caused integrity problem of heating.
Description of drawings
Fig. 1 is the sectional view that shows original field emission planar light source device structure.
Fig. 2 is with the LCD structural section figure of original field emission planar light source device as installation backlight.
Fig. 3 is the structural section figure according to the field emission planar light source device of one embodiment of the invention.
Fig. 4 be according to one embodiment of the invention with the LCD structural section figure of field emission planar light source device as installation backlight.
Fig. 5 is the heat liberation board structural section figure that installs on the field emission planar light source device according to one embodiment of the invention.
Fig. 6 is according to the field emission area source of one embodiment of the invention and original field emission area source contrast effect chart.
Accompanying drawing major part symbol description:
80: diffuser plate 90:LCD module
100: lower glass substrate 110: anode electrode
120: fluorophor 130: top glass substrate
140: cathode electrode 150: the electronics discharge device
160: idle bar 165: frit
200: heat liberation board
Embodiment
Below, will be elaborated to the present invention by an embodiment with above-mentioned formation.Fig. 3 is shown is structural section figure according to the field emission planar light source device of one embodiment of the invention.
As shown in the figure, clearly be to emit top glass substrate 130 directions in source 150 and emit light to forming electronics.Promptly, in embodiment as shown in the figure, do not emit the emulsion or the reflective metal layer that do not utilize anode electrode 110 and fluorophor 120 to form especially above the lower glass substrate 100 of light, after forming cathode electrode 140 and electronics discharge device 150 on the top glass substrate 130, fluorophor 120 on the above-mentioned lower glass substrate 100 and the 150 reverse spaced apart of the electronics discharge device on the above-mentioned top glass substrate 130.
As mentioned above, the structure of one embodiment of the invention is compared with original structure, does not have must superpose on fluorophor 120 emulsion or reflecting plate, so manufacture process has become simple, manufacturing expense has reduced, and can obtain the most basic effect.
Certainly, said structure is compared with original structure and is become more simple, more is applicable to the purpose of using area source.Therefore, the present invention is necessary to pay close attention to this conversion.
Field emission area source originally mainly uses the technology of sending light from field emission apparatus, and field emission apparatus is simple serial light discharge devices such as white light.Promptly, still continuing to use the basic structure of original field emission apparatus, is not indivedual drivings, but for the integral body driving, still use the original tie lines degree of electrode, so very crucial field emission apparatus has still been inherited the problem of non-resulting structure for electric field.
For this reason, in the present invention, the focus of having used light-emitting area is uniform surface light source more, is the field emission structure that is fit to more therefore, can solve original all problems.
Now, will be to illustrating one by one by the improvement on the function that change brought of structure among the present invention.
At first, will pay close attention to the anode electrode 110 that on lower glass substrate 100, forms.In the present invention, anode electrode 110 is not the optical path direction that advances of the light that sends, so there is no need to form transparent metal, thickness is not affected yet, so can form the low opaque metal of resistance, can form the thickness that the input high voltage does not have power loss.Simultaneously, because form fluorophor 120 on above-mentioned anode electrode 110, so the light of emitting from fluorophor 120 anode electrodes 110 directions can be reflected, anode electrode 110 also has the effect in reflector simultaneously.Specifically, for the reflector, thickness directly exerts an influence to reflection efficiency, so if the words that the anode electrode 110 of abundant thickness is formed by the low high metal of reflection efficiency of resistance, the power loss that is caused by the input high voltage just reduces, and catoptrical efficient also can improve.
Now, let us is paid close attention to the installation of fluorophor 120.Existing structure is that electronics conflicts with fluorophor overlapping layer (the generally structure that is overlapped to form by layer 2-3) lower end, the above-mentioned overlapping top fluorophor of the light transmission that is produced is emitted, though so produce light loss, but in the present invention, the electronics conflict that provides from the electronics discharge device 150 of upper plate partly is the top part of fluorophor 120, the light that this part produced still reflects, because emit by upper substrate 130, so the fluorophor gray scale that also can not overlap reduces.
Simultaneously, the light that irregular fluorophor 120 surfaces are produced launches upward, and this has can not be as the characteristic of electric field discharge device use, and still as area source, it becomes the optkmal characteristics that even intensity profile can be provided.
Simultaneously, if plate structure in the observation, top glass substrate 130 parts form cathode electrode 140 by transparent metal, form electronics discharge device 150 in the above, so cathode electrode 140 electric currents mobile fainter is even very thin thickness also can play one's part to the full.Above-mentioned electronics discharge device 150 is compared with whole light-emitting area, has relatively little area, compares with the upper plate that forms original thick anode electrode so in fact should emit the whole upper plate transparency of light, and its efficient is higher.Above-mentioned electronics discharge device 150 utilizes screen printing technique that carbon nano-tube printing is formed, and forms point (dot) form, therefore can raise the efficiency greatly and process.Simultaneously, the lower anode voltage of carbon nano-tube is ejected electron also, so carbon nano-tube is more satisfactory as the words that electronics discharge device 150 uses.Certainly, also can use the electronics of other kind to emit the source.
As mentioned above,,, improve electrical efficiency, improve gray scale just can obtain simpler manufacturing process if use structure of the present invention.But effect of the present invention is not limited to the raising of this efficient or gray scale, and improving its reliability also is its another effect.
In original technology, rely on the conflict of electronics, the fluorophor of heating is positioned on the luminous upper plate, so do not possess heat liberation board on upper plate, can make deformed element because of heating.Specifically, this field emission area source is as the words of use backlight, make display module (LCD module etc.) maximization on the above-mentioned upper plate, so display module is uploaded heat conduction amount, make the display module characteristic of high price low, problem such as just deform, but, in the present invention, the fluorophor 120 that heat takes place is positioned on the lower glass substrate 100, though above-mentioned lower plate is a light-emitting area, is not the display module faying face, so can increase heat liberation board on the above-mentioned lower glass substrate 100, so can solve the low problem of being brought by heating of reliability.
Therefore, the present invention can be counted as by simple structure modify, and with manufacturing process efficient, electrical efficiency and luminous efficiency all improve, thereby improves credible.
Fig. 4 is shown be among Fig. 3 with the LCD structural section figure of field emission planar light source device as installation backlight.As shown in the figure, after the lower plate of formation field emission area source and the idle bar 160 of upper plate utilization and frit 165 are wrapped, LCD module 90 is installed in the above.Also can increase again betwixt and be used for even diffuser plate 80 that spreads of light or prism (not shown) etc.In the present invention, because the light of area source itself evenly spreads, so the diffusion of above-mentioned diffuser plate 80 also can reduce.This is very important, and the diffusion of diffuser plate 80 is high more, and light loss is high more, no matter use or do not use the diffuser plate 80 of low diffusion, the gray scale that can both obtain to add is improved effect.
Fig. 5 is shown is the heat liberation board structural section figure that installs on the field emission planar light source device among Fig. 4.
As shown in the figure, also other heat liberation board 200 can be installed on lower glass substrate 100, casing or the product casing of wrapping the display part module of aforesaid LCD module and area source contact with 100 wide of lower glass substrate, just can not obtain heating effect.
Though aforesaid structure is basic with the diode structure, closes on the electronics discharge device, adds a gate electrode again, with the cathode electrode electronic isolation, also can form 3 electrode structures.Therefore, the present invention can not be subjected to the restriction of electrode structure.
What Fig. 6 was shown is according to the field emission area source of one embodiment of the invention and original field emission area source contrast effect chart.In order to carry out this contrast, the electronics that carbon nano-tube is printed as the round dot form is emitted the source, and fluorophor uses leonard's tube (CRT) to use the P22 fluorophor.Simultaneously, in an embodiment of the present invention, use aluminium 3000 film forming to make anode electrode.
The efficient of anode voltage area source as shown in the figure, efficient of the present invention is compared with existing structure and is improved a lot.For example, anode electrode is if 10kV, and the voltage of existing structure is the efficient of 25lm/W, and opposite efficient of the present invention but is 40lm/W, and in view of this, anode voltage is if 10kV, and efficient of the present invention is than the efficient high about 60% of existing structure.
By above-mentioned description, the related work personnel can carry out various change and modification fully in the scope that does not depart from this invention technological thought.Therefore, the technical scope of this invention is not limited to the content on the specification, must determine its technical scope according to interest field.
Claims (4)
1, a kind of field emission devices high efficiency high-field emission face light source device is characterized in that, comprises with the lower part:
Utilizing the metal that resistance is low, reflecting effect is good to form thickness on the lower glass substrate at high voltage input efficiency and the anode electrode more than the reflection efficiency design standard;
The luminescent coating that on described anode electrode, forms;
The relative electronics discharge device that forms that separates with described luminescent coating;
The transparent cathode electrode of described electronics discharge device is installed;
Form the top glass substrate of described transparent cathode electrode.
2, field emission devices high efficiency high-field emission face light source device as claimed in claim 1 is characterized in that, above-mentioned electronics discharge device utilizes printing process, and printing forms to carbon nano-tube.
3, field emission devices high efficiency high-field emission face light source device as claimed in claim 1 is characterized in that, closes on described electronics discharge device also to comprise a gate electrode that insulate with described cathode electrode on electricity.
4, field emission devices high efficiency high-field emission face light source device as claimed in claim 1 is characterized in that, also comprises the heat liberation board that heat that described fluorophor is sent is effectively dispersed under described lower glass substrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610038985 CN101042980A (en) | 2006-03-20 | 2006-03-20 | Field emission devices high efficiency high-field emission face light source device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610038985 CN101042980A (en) | 2006-03-20 | 2006-03-20 | Field emission devices high efficiency high-field emission face light source device |
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| Publication Number | Publication Date |
|---|---|
| CN101042980A true CN101042980A (en) | 2007-09-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200610038985 Pending CN101042980A (en) | 2006-03-20 | 2006-03-20 | Field emission devices high efficiency high-field emission face light source device |
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| CN (1) | CN101042980A (en) |
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- 2006-03-20 CN CN 200610038985 patent/CN101042980A/en active Pending
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