CN100387102C

CN100387102C - Field emission display having luminance compensation structure and manufacturing method thereof

Info

Publication number: CN100387102C
Application number: CNB2004100339248A
Authority: CN
Inventors: 徐伟胜; 萧棋煌
Original assignee: Teco Nanotech Co Ltd
Current assignee: Teco Nanotech Co Ltd
Priority date: 2004-04-20
Filing date: 2004-04-20
Publication date: 2008-05-07
Anticipated expiration: 2024-04-20
Also published as: CN1691861A

Abstract

The present invention discloses a field-emission display with a luminous brightness compensation structure and a manufacturing method thereof. The heights of cathode conductive layers of red, blue and green are set into different heights according to different luminous efficiency, and the distance of an electron emission source layer and a gate electrode layer positioned at the top end of each cathode conductive layer is different according to different color, so the intensity of an electric field between a negative electrode unit and a positive electrode unit of different colors is different. As the intensity of the electric field is high, the color (blue) with poor luminous efficiency can attract more electrons to be shot to a fluorescent powder layer from the electron emission source layer, and the inconsistent condition of the luminous efficiency of the three colors is compensated. Various colors can generate the same brightness, and thus, the color of the picture is more accurate.

Description

Field Emission Display and manufacture method thereof with luminosity collocation structure

Technical field

The present invention relates to a kind of Field Emission Display and manufacture method thereof with luminosity collocation structure, relate in particular to and a kind ofly change electric field strength, thereby make the inconsistent three primary colors of luminous efficiency can reach the Field Emission Display collocation structure of brightness uniformity by adjusting anode cathode separation.

Background technology

Field Emission Display (Field Emission Display, FED) be one of emerging in recent years flat-panel screens, its reason is that Field Emission Display has the effect of self-lighting, need not use back light in addition, compare with various LCD, except having preferable brightness, it is broader also to have the visible angle scope, power consumption is low, advantages such as reaction speed fast (not staying ghost) and operating temperature are wider, and the image quality that is presented is similar to traditional cathode ray tube (CRT) display very much, and volume is light more than cathode ray tube, thin, thus Field Emission Display to become the rising star who replaces LCD and plasma display panel within sight.In addition, because developing rapidly of nanometer technology in recent years is applied to nano material in the Field Emission Display, certainly will will further promote it to develop into ripe commodity.

Fig. 1 is a kind of cutaway view of known three-stage structure Field Emission Display.As shown in Figure 1, its structure mainly comprises positive plate 10 and minus plate 20.Be provided with eyelid retractor (spacer) 14 between positive plate 10 and the minus plate 20, be used for be provided with between positive plate 10 and the minus plate 20 vacuum space every and as the support between positive plate 10 and the minus plate 20.Positive plate 10 comprises an anode substrate 11, an anode conductive layer 12 and a fluorescent powder coating (phosphors layer) 13.Minus plate 20 comprises a cathode base 21, a cathode conductive layer 22, an electron emission source layer 23, a dielectric layer 24 and a gate layer 25.Wherein gate layer 25 is applied in a current potential official post electron emission source layer 23 and penetrates electronics, the high voltage that is provided by anode conductive layer 12 comes accelerated electron beam, makes electronics have fluorescent powder coating 13 on enough kinetic energy bump (impinge) positive plate 10 that it is excited and luminous.

Each pixel (pixel) on the display picture is formed by the anode and cathode unit of three colors such as red, blue, green, send the light of different colours because of the difference of fluorescent powder coating 13 compositions, but the luminous efficiency of the fluorescent powder coating 13 of three looks also inconsistent, and the electron beam with identical energy clashes into the back brightness that is produced and inequality.But because in known structure, the configuration of each group anode and cathode unit is all identical, electron emission source layer 23 is also identical with the distance of gate layer 25 and fluorescent powder coating 13, therefore under the gate current potential situation identical with anode potential, the electron number that gate layer 25 is attracted is also identical, but the luminous efficiency difference of the fluorescent powder coating 13 of three looks, the ratio of red bluish-green three looks is about 2: 1: 7, and cause the brightness difference, and then make the color and the luminance distortion of picture, known Field Emission Display is for addressing this problem, need design the height that very complicated control circuit comes accurate control grid current potential, to compensate the inconsistent of luminous efficiency, still the cost of this solution is high, does not meet economic benefit.

Another kind of solution is thickness or the area by adjusting fluorescent powder coating 13 of all kinds, promptly for the lower color of luminous efficiency, strengthen the thickness of its fluorescent powder coating 13 or the deficiency that area compensates luminous efficiency, but because of the picture of display becomes arranged by a large amount of pixels (per three groups of anode and cathode unit constitute a pixel), therefore this compensation way is difficult to make each fluorescent powder coating 13 in each pixel all to reach consistent, and manufacture process is quite complicated, can't thoroughly address this problem.

Content of the present invention

Main purpose of the present invention provides a kind of Field Emission Display and manufacture method thereof with luminosity collocation structure, can be the most effective and compensate the inconsistent of fluorescent powder luminous efficiency of all kinds in the minimum mode of cost, make the bump of electron beam under the same conditions can reach the unanimity of brightness, and need not use complicated control circuit or complicated manufacture process can reach above-mentioned purpose, have economic benefit.

To achieve these goals, the present invention sets the cathode conductive layer with difference in height according to the difference of fluorescent powder luminous efficiency of all kinds, make the fluorescent powder coating and the distance between gate that are positioned at the cathode conductive layer top different, under the situation that applies identical gate current potential, can produce different electric field strength, make the higher electric field strength of generation between the lower anode and cathode unit of luminous efficiency, attract more electronic impact fluorescent powder, thereby compensate the deficiency of its luminous efficiency.

The present invention not only has very accurate height control, and manufacture process is very easy, and cost is lower, does not need complicated control circuit again, under the least cost expenditure, reaches the most effective luminance compensation effect.

Brief description of drawings

Fig. 1 is the cutaway view of known three-stage structure Field Emission Display;

Fig. 2 is the cutaway view of the Field Emission Display with luminosity collocation structure of the embodiment of the invention.

Embodiment

In order to make those skilled in the art further understand feature of the present invention and technology contents, see also following about detailed description of the present utility model and accompanying drawing, accompanying drawing only provide with reference to and usefulness is described, be not to be used for limiting the present invention.

Fig. 2 is a cutaway view of the present invention.As shown in Figure 2, basic structure of the present invention still keeps three-stage structure of the prior art, mainly comprises positive plate 30 and minus plate 40.Be provided with eyelid retractor 34 between positive plate 30 and the minus plate 40, be used for be provided with between positive plate 30 and the minus plate 40 vacuum space every and as the support between positive plate 30 and the minus plate 40.Positive plate 30 comprises an anode substrate 31, an anode conductive layer 32 and a fluorescent powder coating 33.Minus plate 40 comprises a cathode base 41, a cathode conductive layer 42, an electron emission source layer 43, a dielectric layer 44 and a gate layer 45.The anode and cathode unit that the present invention is characterized in red bluish-green three looks in each pixel, adjust the distance of electron emission source layer of all kinds 43 and gate layer 45, green, redness is about 7: 2: 1 with the luminous efficiency ratio of the fluorescent powder coating 33 of blueness, therefore with the electron emission source layer 43 of all kinds and the distance setting of fluorescent powder coating 33 identical ratio 7: 2: 1, electric field strength is 1/7: 1/2: 1, promptly equal 2: 7: 14, can obtain 1: 1: 1 desirable luminosity ratio after multiplying each other with the luminous efficiency ratio, (electric field strength is that voltage is divided by distance can to change interelectrode electric field strength of all kinds under the constant situation of voltage, E=V/D), difference by electric field strength, make gate layer 45 attract the electronics directive fluorescent powder coating 33 of varying number from electron emission source layer 43, can compensate the difference of fluorescent powder coating 33 luminous efficiencies of all kinds, it is the lower fluorescent powder coating of luminous efficiency 33 (as blue and red), electric field strength between anode and cathode is bigger, can attract the fluorescent powder coating 33 of more electronics directive correspondence, thereby improve its luminosity, the deficiency of compensation luminous efficiency; And the higher color (as green) of luminous efficiency, the electric field strength between negative electrode is less, thereby reduces its brightness, and the luminosity of three looks is reached unanimity.Because the three fluorescence powder only can reach 7: 2: 1 luminous efficiency ratio under prior art, maximum reaches 7: 1 with the ratio of minimum value, at cathode-

anode plate

30,40 must maintain under the restriction of a feasible scope with the spacing of gate layer 45, the distance that electron emission source layer 43 and gate layer are 45 still can't reach 7: 2: 1 ratio under present technical conditions, promptly can't reach optimal ratio, what can reach now only is about 2: 1: 1 ratio, but also can reach quite outstanding compensation effect, if the luminous efficiency of following three fluorescence powder ratio improves to some extent and draws in its ratio, promptly can reach best ratio.

Change the method for the distance of 30 of electron emission source layer 43 and positive plates, for setting the height of cathode conductive layer of all kinds 42, because electron emission source layer 43 is positioned at the top of cathode conductive layer 42, the height that therefore changes cathode conductive layer 42 can change the distance of electron emission source layer 43 and gate layer 45.Can achieve the above object by following dual mode:

(1) thick film manufacture process: by the elargol of the multilayered printed formation cathode conductive layer 42 of screen painting mode, print, produce different thickness, promptly produce the thick film (being cathode conductive layer 42) of differing heights by the elargol of the different numbers of plies.

(2) little shadow manufacture process: as cathode conductive layer 42, the photosensitive type elargol is carried out the exposure of different time by the photosensitive type elargol, by its height of length ratio decision of time for exposure.

Can produce the cathode conductive layer 42 of differing heights by above-mentioned two kinds of methods, not only can reach very accurate height control, and manufacture process is very easy, do not cause cost too high, do not need complicated control circuit yet, under the situation of least cost, can reach the most effective luminance compensation effect.Compare with prior art solutions, the present invention is a best solution.File an application patent hereby.

The above only is the preferred embodiments of the present invention, be not so limit claim of the present invention, the equivalent structure transformation that every utilization specification of the present invention and accompanying drawing content are done, or directly or indirectly apply to other relevant technical field, all in like manner comprise within the scope of the invention.

Claims

1. Field Emission Display with luminosity collocation structure, it is characterized in that, the anode and cathode unit of three looks in each pixel in described Field Emission Display, when the ratio of the luminous efficiency of the fluorescent powder of described green red blue three looks is 7: 2: 1, distance between electron emission source layer and corresponding gate layer is than being 2: 1: 1, make the electric field strength difference between the anode and cathode unit of three looks, thus the difference of compensation luminous efficiency.

2. manufacture method with Field Emission Display of luminosity collocation structure, it is characterized in that with elargol as the cathode conductive layer in the described Field Emission Display, print the elargol of the different numbers of plies by the screen painting mode, can produce different thickness thus, promptly produce the cathode conductive layer of differing heights, make the electron emission source layer that is positioned on the cathode conductive layer different with the spacing of gate layer, when the ratio of the luminous efficiency of the fluorescent powder of described green red blue three looks was 7: 2: 1, the distance between the electron emission source layer of described three looks and corresponding gate layer was than being 2: 1: 1.

3. manufacture method with Field Emission Display of luminosity collocation structure, it is characterized in that with the photosensitive type elargol as the cathode conductive layer in the described Field Emission Display, the photosensitive type elargol is carried out the exposure of different time, its height of length ratio decision by the time for exposure, thereby can produce the cathode conductive layer of differing heights, make the electron emission source layer that is positioned on the cathode conductive layer different with the spacing of gate layer, when the ratio of the luminous efficiency of the fluorescent powder of described green red blue three looks was 7: 2: 1, the distance between the electron emission source layer of three looks and corresponding gate layer was than being 2: 1: 1.