CN1959503A - Field emission element in use for background light - Google Patents
Field emission element in use for background light Download PDFInfo
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- CN1959503A CN1959503A CN 200510095269 CN200510095269A CN1959503A CN 1959503 A CN1959503 A CN 1959503A CN 200510095269 CN200510095269 CN 200510095269 CN 200510095269 A CN200510095269 A CN 200510095269A CN 1959503 A CN1959503 A CN 1959503A
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- field emission
- emission element
- fluorophor
- carbon nanotube
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Abstract
A field emission element used on background lamp makes form of fluorescent surface on fluorescent body be a projected surface in order to increase coating area of fluorescent body for raising efficiency of field emission element utilizing carbon nanotube as electronic emission source.
Description
Technical field
The present invention relates to field emission element in use for background light,, thereby increase the field emission element in use for background light of the application area of fluorophor especially about being that the shape that electronics is emitted the face of the fluorophor that the field emission element in source forms is a raised face with the carbon nanotube.
Background technology
Recently, along with various display devices are developed, the importance of light source also is enhanced.These light sources are with the filament heating, utilize the whole bag of tricks such as gas discharge, light-emitting phosphor.These light sources can only use as simple light fixture, but also can be used in the display backlights such as LCD that are made into the area source form.
The backlight main use of this LCD can improve very high gray scale and have the fluorescent light (Flourescent Lamp:FL) in uniformly light-emitting zone.This fluorescent light mainly is to be coated with at the glass tube inside surface to spread fluorescent material, after the two ends of glass tube form electrode, inert gas and mercury is enclosed in the lamp.Simultaneously, if the two ends to lamp apply 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.Above-mentioned ultraviolet ray shines on the fluorophor that the glass tube inner face smears, and generates visible light.
But this FL 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 LCD size.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 light sources that has the efficient of better gray scale than FL.
In this new light source, utilize size, gray scale and the efficient of the light source of electroluminescence (Field Emission:FE) all to show up prominently.The method of this electroluminescence is as using electric-field light-emitting element, after forming the field emission source of various forms, the electron impact of from above-mentioned field emission source, emitting to the fluorophor on opposite, thereby can be luminous, by fairly simple formation, can obtain the light source of high gray scale.
What Fig. 1 a and Fig. 1 b were shown is the existing sectional view that utilizes the field emission element of carbon nanotube (CNT).The structure of the field emission element b of 3 utmost point field emission element a sum counter electrode bottom door structures as shown in the figure.
As shown in Figure 1a, 3 utmost point field emission elements are made of following each several part: the cathode electrode 12 and the gate electrode 15 that are formed for importing driving power on lower basal plate 11; Be used to make the insulation course 13 of above-mentioned cathode electrode 12 and gate electrode 15 insulation; What form on above-mentioned cathode electrode 12 emits the carbon nanotube 14 in source as electronics; Make upper substrate 18 and lower basal plate 11 keep the spacer 16 of certain intervals; On upper substrate 18, the fluorophor 17 that utilizes the electron luminescence that above-mentioned carbon nanotube 14 emits is set.
The field emission element of the counter electrode bottom door structure shown in Fig. 1 b, top at lower gate line 22, form through hole VIA on the insulation course 23, counter electrode 25 forms at grade with cathode electrode 24, and the field emission element of this counter electrode bottom door structure is made of following each several part: lower gate line 22 that forms successively on lower basal plate 21 and insulation course 23; A part forms the cathode electrode 24 of emitting source carbon nanotube 26 as electronics on above-mentioned insulation course 23 tops; A part of corroding above-mentioned insulation course 23 forms through hole VIA, and is connected with lower gate line 22 by formed through hole, the counter electrode 25 that forms at grade with above-mentioned cathode electrode 24; Make upper substrate 29 and lower basal plate 21 keep the spacer 27 of certain intervals; Be formed on the fluorophor 28 on the upper substrate 29.
By above-mentioned Fig. 1 a and Fig. 1 b as can be known, the face of existing formation fluorophor is a planar structure.
In general, the efficient of field emission element is to increase along with the increase of the anode voltage of input anode electrode (not shown), reduces along with the minimizing of current density.Simultaneously, compare, utilize the efficient of pulsed drive higher with utilizing direct drive.In this each parameter is not independent action, but in the structure of mutual subordinate role, needs really each parameter with actual influence effect is regulated.
As above routine described, as to utilize the background light utilization of carbon nanotube field emission element to emit from carbon nanotube electron impact light-emitting phosphor utilizes this structure so that efficient increases, but this structure has following shortcoming for adjusting each parameter:
The first, if anode voltage is increased, just increased gray scale, it is the general method of generally using that the gray scale of passing through to be increased increases efficient.Simultaneously, because the field emission element is a vacuum unit, so use spacer in order to support upper substrate and lower basal plate, because spacer is not exposed in the front of screen, and in order fully to guarantee the distance between upper and lower plates, the shape that must make spacer so just exists the difficulty in the making than upper and lower plates contact site height.That is, if anode voltage is set, just can produce the phenomenons such as electric arc that generate because of high voltage, thus make the poor stability of element, so can be difficult to improve voltage.
The second, if anode voltage is set, increases and emit electric current, along with the increase of emitting electric current, current density also is increased, and along with the increase of current density, reduces phenomenon just can produce efficient.The field emission element makes screen voltage increase more, and the boundling degree of electron beam is just high more, and along with the difference of screen position, current density just can produce very big deviation.Promptly, as shown in Figure 2, if screen voltage is elevated to V2 from V1, the boundling degree of the electron beam that the carbon nanotube 31 that forms on lower basal plate 30 is emitted is elevated to D2 from D1, the part that the fluorophor 32 that forms on this electron beam and the upper substrate 33 bumps is different, therefore can produce the deviation of current density.
The 3rd, identical with the fluorophor of CRT, if form the white layer of Al (not shown), though efficient has increased, in the electronics and the white layer collision of Al that end voltage is emitted, the energy of ejected electron has reduced, thus, just can produce the problem that can not fully shine on the fluorophor.Before forming the white layer of Al, the problem that exists efficient to reduce on the contrary.Simultaneously, for though the end voltage fluorophor that is used for low voltage drive has been developed, but so far also not exclusively, still use the main high voltage fluorophor that uses among the CRT, this high voltage fluorophor normally moves when 20KV is above usually, so because the factor that the electron energy loss of the white layer of Al causes fluorophor efficient to reduce is the key factor that definitely can not ignore in low voltage drive.
As mentioned above, it is not independent parameter that influence utilizes each factor of the field emission efficiency of element of carbon nanotube field emission effect, but has the factor effect of mutual subordinate relation.Wherein, the efficient that causes along with the increase of current density reduces to make the efficient of the area source that utilizes carbon nanotube to reduce, so in order to obtain identical gray scale, must need high electric power.Being not used in luminous electric power then shows with the form of heat.Simultaneously, though the electron beam boundling part gray scale that carbon nanotube is emitted is increased, efficient has reduced, though the part efficient of boundling is high for electron beam, but for the electron beam that produces gray scale but can not fully cause collision, so overall can cause the shortcoming that power consumption is big.
Summary of the invention
What invented in order to address the above problem the purpose of this invention is to provide the field emission element in use for background light with following effect: the shape of smearing the face of fluorophor is to have triangle, trapezoidal, oval, semicircle and zigzag outstanding structural plane, make the enlarged areas of smearing fluorophor, the area that the electronics of emitting from carbon nanotube and fluorophor are clashed increases, thereby can increase efficient.
Simultaneously, another object of the present invention provides the field emission element in use for background light with following effect: in order to obtain identical gray scale, can carry out low current density drives, thereby can guarantee the stability of element, reduce the possibility of phosphor degradation, thereby can have raising the efficiency and reduce the effect of electricity consumption.
To achieve these goals, the present invention has following feature: for the field emission element that carbon nanotube is used as the electronics source that emits, the electronics of emitting with above-mentioned carbon nanotube bumps and the shape of the luminous face of having smeared fluorophor is given prominence to.
Simultaneously, the present invention also has following feature: the shape of above-mentioned face is to have more than one outstanding structural plane in triangle, trapezoidal, oval, semicircle and the serrate.
The above, the present invention has following effect: the shape of having smeared the face of fluorophor is to have triangle, trapezoidal, oval, semicircle and zigzag outstanding structural plane, make the enlarged areas of smearing fluorophor, the area that the electronics of emitting from carbon nanotube and fluorophor are bumped increases, thereby can increase efficient.
Simultaneously, the present invention also has following effect: in order to obtain identical gray scale, can carry out low current density and drive, thereby can guarantee the stability of element, reduce the possibility of phosphor degradation, thereby can have raising the efficiency and reduce the effect of electricity consumption.
Description of drawings
Fig. 1 a to Fig. 1 b is shown is the carbon nanotube field emission element b sectional view of original 3 electrode carbon nanotube field emission element a sum counter electrode bottom door structures.
Fig. 2 be used for account for screen voltage and carbon nanotube electron beam directly under the relation illustration.
What Fig. 3 was shown is according to the sectional view of background light of the present invention with the carbon nanotube field emission element of counter electrode bottom door structure.
Fig. 4 is according to face shape figure of the present invention.
Accompanying drawing major part symbol description
21: lower basal plate 22: the lower gate line
23: insulation course 24: cathode electrode
25: counter electrode 26: carbon nanotube
27: spacer 28: fluorophor
29: upper substrate
Embodiment
Below, preferred to according to field emission element in use for background light of the present invention with reference to the accompanying drawings
Embodiment is elaborated.
As a rule, the efficient of background light is represented with " efficient=brightness * π * display area/electric power ".Can learn that from formula efficient is directly proportional with brightness and display area, and is inversely proportional with electric power.
Principal feature of the present invention is embodied in: with the shape of the luminous face of the electron collision of emitting from carbon nanotube be the face structure that highlights, the surface area of the fluorophor that bumps with the electronics of emitting has enlarged.
What Fig. 3 was shown is according to the sectional view of background light of the present invention with the carbon nanotube field emission element of counter electrode bottom door structure.
Shown among the figure is the field emission element of counter electrode bottom door structure.Compare with the existing field emission element shown in Fig. 1 b, its difference is: a part that forms the upper substrate 29 of fluorophor 28 has been corroded to such an extent that have certain shape (triangle), can form fluorophor 28 on its part that is corroded.
Simultaneously, except that above-mentioned upper substrate 29 and fluorophor 28, other parts all are identical.The field emission element of counter electrode bottom door structure is made of following each several part: lower gate line 22 that forms successively on lower basal plate 21 and insulation course 23; A part forms the cathode electrode 24 of emitting source carbon nanotube 26 as electronics on above-mentioned insulation course 23 tops; A part of corroding above-mentioned insulation course 23 forms through hole VIA, and is connected with lower gate line 22 by formed through hole, the counter electrode 25 that forms at grade with above-mentioned cathode electrode 24; Make upper substrate 29 and lower basal plate 21 keep the spacer 27 of certain intervals.
Constitute as can be known by above-mentioned, dependence makes carbon nanotube 26 ejected electrons to the specific driving voltage of cathode electrode 24 sum counter electrodes 25 inputs, this electronics of emitting relies on the anode voltage that is input to the anode electrode (not shown) to be accelerated to fluorophor 28 and washes away, and electronics that this process is quickened and fluorophor 28 bump and be luminous.At this moment, the area of the fluorophor 28 that bumps with the electronics of emitting from carbon nanotube 26 is compared with the area of fluorophor as shown in Figure 1 and is wanted big, if so what inject is identical electron beam, the current density among the present invention will be low, just therefore can obtain higher efficient.
As mentioned above, in the present invention, in order to improve the efficient of element, in order to enlarge and the bump area of face of luminous fluorophor of carbon nanotube institute emit electron beam, the shape of having smeared the face of fluorophor is not the plane, becomes to have the given shape of raised face structure and be corroded.
For example, to shown in (g), the face of having smeared fluorophor can be made into the multiple shape that triangle, trapezoidal, spirality, ellipse, semicircle and serrate etc. can enlarge application area, can raise the efficiency with this as (a) among Fig. 4.That is, the face is made into any one shape in the above-mentioned form, and it also can be made into wherein two or more mixing shapes certainly.
Simultaneously, the shape of face is outstanding formation, because can improve the efficient of background light, so just can be achieved by the low current density driving of low-voltage, thus, just can reduce power consumption.
In an embodiment of the present invention, though the situation that the front of background light is provided with fluorophor is illustrated, in addition, has the field emission element that reflecting plate, back be provided with fluorophor and also can realize.
Simultaneously, in the present invention, though the carbon nanotube of emitting the source as electronics be diode shape or limit shape all it doesn't matter, its effect can both realize.That is, it is applicable to that all emit all field emission elements of source effect with carbon nanotube as electronics, for example, the field emission element of bottom door structure, 3 electrode field emission elements etc. can both be suitable for.
By above-mentioned description, the related work personnel can carry out various change and modification fully in the scope that does not depart from the technology of the present invention thought.Therefore, technical scope of the present invention is not limited to the content on the instructions, must determine its technical scope according to the claim scope.
Claims (2)
1, a kind of field emission element in use for background light is the field emission element that carbon nanotube is used as the electronics source that emits, and it is characterized in that: the electronics of emitting with above-mentioned carbon nanotube bumps and the shape of the luminous face of having smeared fluorophor is given prominence to.
2, field emission element in use for background light as claimed in claim 1 is characterized in that: the shape of above-mentioned face is to have more than one outstanding structural plane in triangle, trapezoidal, oval, semicircle and the serrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510095269 CN1959503A (en) | 2005-11-04 | 2005-11-04 | Field emission element in use for background light |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510095269 CN1959503A (en) | 2005-11-04 | 2005-11-04 | Field emission element in use for background light |
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| CN1959503A true CN1959503A (en) | 2007-05-09 |
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| CN 200510095269 Pending CN1959503A (en) | 2005-11-04 | 2005-11-04 | Field emission element in use for background light |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8294354B2 (en) | 2010-12-16 | 2012-10-23 | Tatung Company | Field emission light source device with improved light utilization efficiency |
| US8390186B2 (en) | 2010-12-16 | 2013-03-05 | Tatung Company | Field emission planar lighting lamp |
| US8575832B2 (en) | 2010-12-16 | 2013-11-05 | Tatung Company | Field emission display |
| CN109477917A (en) * | 2016-07-11 | 2019-03-15 | 富士胶片株式会社 | Backlight film |
-
2005
- 2005-11-04 CN CN 200510095269 patent/CN1959503A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8294354B2 (en) | 2010-12-16 | 2012-10-23 | Tatung Company | Field emission light source device with improved light utilization efficiency |
| US8390186B2 (en) | 2010-12-16 | 2013-03-05 | Tatung Company | Field emission planar lighting lamp |
| US8575832B2 (en) | 2010-12-16 | 2013-11-05 | Tatung Company | Field emission display |
| CN109477917A (en) * | 2016-07-11 | 2019-03-15 | 富士胶片株式会社 | Backlight film |
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