CN1983621A - Color organic electrically-excited luminescent display device and its production - Google Patents
Color organic electrically-excited luminescent display device and its production Download PDFInfo
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- CN1983621A CN1983621A CN 200510131793 CN200510131793A CN1983621A CN 1983621 A CN1983621 A CN 1983621A CN 200510131793 CN200510131793 CN 200510131793 CN 200510131793 A CN200510131793 A CN 200510131793A CN 1983621 A CN1983621 A CN 1983621A
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Abstract
The invention is concerned with the organic electroluminescence monitor, it is: the monitor with the element unit locates the transparent base-board, each element unit includes the first electrode located on the top of the transparent base-board, defines the first element unit electrode area, the second element unit electrode area and the third element unit electrode area on the first electrode; the first organic luminescence layer locates on the top of the first element unit electrode area; the second organic luminescence layer locates on the top of the second element unit electrode area; the third organic luminescence layer locates on the top of the third element unit electrode area, and covers on the top of the first organic luminescence layer and the second organic luminescence layer. Different organic luminescence layer is with different wavelength color. The second electrode sets on the top of the third organic luminescence layer.
Description
Technical field
The invention relates to a kind of organic electro-luminescent display, and particularly relevant for a kind of color organic electrically-excited luminescent display device and manufacture method thereof.
Background technology
Generally speaking, organic electro-luminescent display has excellent specific properties such as self-luminous, in light weight, wide viewing angle, high contrast, low power consumption and high answer speed.The structure of organic electro-luminescent display can comprise anode electrode and be positioned at the base material top, and organic luminous layer is positioned at the anode electrode top, and cathode electrode is positioned at the organic luminous layer top.When applying a voltage between anode electrode and the cathode electrode, can order about electronics and electric hole enters organic luminous layer, and make organic luminous layer produce electroluminescence (Electroluminescence; EL).
Prior art provides the full-colorization manufacture method of many organic electro-luminescent displays, for example, United States Patent (USP) the 6th, 515, No. 428 disclosed " has chromatic filter layer (Color Filter; CF) organic electro-luminescent display ", be to send white light by organic luminous layer earlier, make the chromatic filter layer of white light again, and obtain ruddiness, green glow, blue light respectively by different colours, so reach full-colorization effect.Yet, this technology of utilizing white light by chromatic filter layer, the penetrance of its solid color is less than about 25%, and color saturation is not good.And, utilize micro-photographing process to prepare these chromatic filter layers, need numerous and diverse step and processing procedure comparatively consuming time usually.
Another kind of prior art, for example United States Patent (USP) the 6th, 522, and No. 066 disclosed " has color converting layer (Color Conversion Medium; CCM) organic electro-luminescent display ", be to use different color converting layers to change the blue light that organic luminous layer sends, and obtain ruddiness, green glow, blue light respectively, so reach full-colorization effect.Yet, utilize micro-photographing process to prepare color converting layer, also need numerous and diverse step and processing procedure consuming time.
In addition, korean patent application 2001-0000943 number disclosed " organic electro-luminescent display with chromatic filter layer or color converting layer " is to use different single openings to shield the organic luminous layer that forms different colours.Yet because the shielding opening of each picture element is about tens of microns, therefore the requirement of the contraposition accuracy between shielding and substrate is high, so can increase the degree of difficulty of processing procedure.And the organic luminous layer of different colours adopts the separately technology of plated film (side by side), relatively can increase processing procedure cost and time.
Therefore, for reaching full-colorization effect,, then can reduce the service efficiency of light, and its color saturation is not good as if the chromatic filter layer that the white light of white light organic luminous layer is used different colours.On the other hand, if use the separately technology of plated film, then its processing procedure is complicated, the manufacturing cost height, and its processing procedure requires high contraposition accuracy, and this can increase the degree of difficulty of processing procedure.Therefore, must improve the structure of organic electro-luminescent display and solve the problem that shields the contraposition precision,, and promote the manufacturing yields with penetrance, color saturation, the luminosity of lifting organic electro-luminescent display.
Summary of the invention
Main purpose of the present invention is providing a kind of organic electro-luminescent display, can promote luminosity, penetrance and the color saturation of organic electro-luminescent display, to reach full-colorization of organic electro-luminescent display, and only need lower driving voltage in use, therefore also can prolong its useful life.
According to a preferred embodiment of the present invention, the structure of this organic electro-luminescent display comprises a plurality of picture elements unit.Each picture element unit comprises first electrode, first organic luminous layer, second organic luminous layer, the 3rd organic luminous layer and second electrode.First electrode is arranged at transparency carrier top, and has for the first time picture element electrode zone, picture element electrode zone and picture element electrode zone for the third time for the second time.First organic luminous layer is positioned at picture element electrode zone top for the first time.Second organic luminous layer is positioned at picture element electrode zone top for the second time.The 3rd organic luminous layer is positioned at picture element electrode zone top for the third time, and is covered in first organic luminous layer and second organic luminous layer top.These organic luminous layers have different luminescent spectrums.Second electrode is arranged at the 3rd organic luminous layer top.
Another purpose of the present invention is that a kind of manufacture method of organic electro-luminescent display is being provided, and can use the alignment procedures of one standard-sized sheet shielding, and increases the permission of bit errors when making, and then reduces to make degree of difficulty and promote and make yields.
According to a preferred embodiment of the present invention, form first electrode earlier in the transparency carrier top.Then, definition for the first time picture element electrode zone, for the second time picture element electrode zone and for the third time picture element electrode zone on first electrode.Then, use first shielding to hide picture element electrode zone and picture element electrode zone for the second time for the third time, and form first organic luminous layer in the picture element electrode zone top first time.Then, the secondary shielding of use hides picture element electrode zone and picture element electrode zone for the first time for the third time, and forms second organic luminous layer in the picture element electrode zone top second time.Afterwards, form the 3rd organic luminous layer in the top of picture element electrode zone for the third time, and be covered in first organic luminous layer and second organic luminous layer top, wherein these organic luminous layers have different luminescent spectrums.At last, form second electrode in the 3rd organic luminous layer top.The coloured light that first organic luminous layer and second organic luminous layer are sent out can be appoints both among ruddiness, green glow or the blue light three, and the coloured light that the 3rd organic luminous layer is sent out is among the three remaining one or white light.
In sum, organic electro-luminescent display of the present invention, its processing procedure is to use a full-open type to shield in the step of its evaporation organic luminous layer to replace traditional shielding, and more selectively arrange in pairs or groups chromatic filter layer or color converting layer (CCM) filter or modify, therefore can increase the admissible error of shielding contraposition, and can reduce to make degree of difficulty and promote and make yields.
And, if above each chromatic filter layer, dispose and the corresponding organic luminous layer of its color, then can promote the luminosity and the color saturation penetrance of organic electro-luminescent display.Perhaps, be corresponding to the luminescent spectrum of the organic luminous layer of its top if make the absorption spectrum of each color converting layer (CCM), then can promote and strengthen luminosity and color saturation.In view of the above, the luminous utilization rate of organic electro-luminescent display of the present invention is preferable, only needs lower driving voltage in the use, therefore can reduce power consumption and increases the service life, so as to realizing full-colorization of organic electro-luminescent display, more can be provided at the related application of the display of maximization.
Description of drawings
For above and other objects of the present invention, feature, advantage and embodiment can be become apparent, being described in detail as follows of accompanying drawing:
Fig. 1 illustrates the generalized section of the organic electro-luminescent display of a preferred embodiment of the present invention;
Fig. 2 illustrates the generalized section of the organic electro-luminescent display of another preferred embodiment of the present invention;
The organic electro-luminescent display that Fig. 3 illustrates another preferred embodiment of the present invention has the generalized section of bit errors;
Fig. 4 illustrates the flow chart of the organic electro-luminescent display manufacture method of a preferred embodiment of the present invention; And
Fig. 5 illustrates the flow chart of the organic electro-luminescent display manufacture method of another preferred embodiment of the present invention.
Description of reference numerals:
100,200: transparency carrier
102,202: the first electrodes
104,204: picture element electrode zone for the first time
106,206: picture element electrode zone for the second time
108,208: picture element electrode zone for the third time
110,210: the first organic luminous layers
112,212: the second organic luminous layers
114,214: the three organic luminous layers
116,216: the second electrodes
134,234: the first coloured light zones
136,236: the second coloured light zones
138,238: the three coloured light zones
218: the first chromatic filter layers
220: the second chromatic filter layers
222: the three chromatic filter layers
224: smooth screen
312: second organic luminous layer of skew
314: coloured light
410,420,422,430,440,450,452,460: step
502,504,510,520,522,530,540,550,552,560: step
Embodiment
The invention provides a kind of organic electro-luminescent display, after forming first organic luminous layer and second organic luminous layer, use the full-open type shielding that the 3rd organic luminous layer is formed and be covered on above-mentioned first and second organic luminous layer, therefore can improve the alignment procedures of the shielding in the conventional process.And the chromatic filter layer or the color converting layer (CCM) of the corresponding color of can arranging in pairs or groups again in addition carry out color filtering or modification, even make the shielding contraposition exceed the trueness error scope, also can realize preferable full-colorization effect.
Fig. 1 illustrates the generalized section of the organic electro-luminescent display of a preferred embodiment of the present invention.What will illustrate earlier is that for preferred embodiment of the present invention clearly is described, following icon is an example with a picture element unit all only.The picture element unit of this organic electro-luminescent display comprises transparency carrier 100, first electrode 102, first organic luminous layer 110, second organic luminous layer 112, the 3rd organic luminous layer 114 and second electrode 116.
First electrode 102 is arranged at transparency carrier 100 tops, and is defined out for the first time picture element electrode zone 104, picture element electrode zone 106 and picture element electrode zone 108 for the third time for the second time on first electrode 102.First organic luminous layer 110 is positioned at picture element electrode zone 104 tops for the first time.112 of second organic luminous layers are positioned at picture element electrode zone 106 tops for the second time.The 3rd organic luminous layer 114 is positioned at picture element electrode zone 108 tops for the third time, and is covered in first organic luminous layer 110 and second organic luminous layer, 112 tops.These organic luminous layers 110,112,114 have different luminescent spectrums.116 at second electrode is arranged at the 3rd organic luminous layer 114 tops.
In this preferred embodiment, the luminescent spectrum of first organic luminous layer 110, second organic luminous layer 112 and the 3rd organic luminous layer 114 substantially each self-contained three primary colors one of them.For example, the luminescent spectrum of first organic luminous layer 110 is red-light spectrum (R), and its wavelength comprises about 585-780nm; The luminescent spectrum of second organic luminous layer 112 is green spectrum (G), and its wavelength comprises about 485-585nm; The luminescent spectrum of the 3rd organic luminous layer 114 is blue spectrum (B), and its wavelength comprises about 380-485nm.
In above-mentioned framework, though be positioned at the coloured light (as blue light) that the 3rd organic luminous layer 114 of top is sent, can be overlapping respectively to first, second organic luminous layer 110 and 112 coloured light that sent (as ruddiness, green glow) that are arranged in the below.Yet, show that according to experimental result the coloured light that sent of the 3rd organic luminous layer 114 can't cause too much influence on the visual experience to the user herein.So, by this kind framework, can be from the first coloured light zone 134, the 136 and the 3rd coloured light zone 138, second coloured light zone obtains required coloured light respectively, for example ruddiness, green glow and blue light.That is to say that this preferred embodiment can be omitted the configuration of chromatic filter layer, just can reach the effect of full-colorization of organic electro-luminescent display by simple framework.
As shown in Figure 1, when three organic luminous layers are responsible for a kind of three primary colors separately, can omit chromatic filter layer and reach full-colorization effect according to experimental result.Certainly, can also arrange in pairs or groups filter layer or color converting layer (Color Change Media Layer of organic electro-luminescent display disclosed in this invention; CCM Layer) to filter or approximate trichromatic other coloured light of conversion.
Fig. 2 illustrates the generalized section of the organic electro-luminescent display of another preferred embodiment of the present invention.First chromatic filter layer 218 is between the first time picture element electrode zone 204 and transparency carrier 200.Second chromatic filter layer 220 is between the second time picture element electrode zone 206 and transparency carrier 200.The 3rd chromatic filter layer 222 is for the third time between picture element electrode zone 208 and the transparency carrier 200.The spectrum of each chromatic filter layer 218,220,222 corresponds respectively to the luminescent spectrum of the organic luminous layer 210,212,214 of its top.
For example, when the first coloured light zone 234, when the 236 and the 3rd coloured light zone 238, second coloured light zone needs to send ruddiness (R), green glow (G) and blue light (B) respectively, the ruddiness of first chromatic filter layer 218 (R) spectrum, luminescent spectrum ruddiness (R) luminescent spectrum corresponding to first organic luminous layer 210, be that ruddiness can first chromatic filter layer 218, and filter the non-red-light spectrum that the 3rd organic luminous layer 214 of first organic luminous layer, 210 tops is sent.The green glow of second chromatic filter layer 220 (G) spectrum corresponding to green glow (G) luminescent spectrum of second organic luminous layer 212, and filters the non-green spectrum that the 3rd organic luminous layer 214 of second organic luminous layer, 212 tops is sent.
Yet, because only there be three organic luminous layer 214 corresponding with its color in the 3rd chromatic filter layer 222 its tops, if oneself has desirable luminescent spectrum (as blue light (B)) the 3rd organic luminous layer 214, then can optionally thereunder dispose the 3rd chromatic filter layer 222 that is similarly blue.If the luminescent spectrum of the 3rd organic luminous layer 214 is white-light spectrum, then still must uses the 3rd chromatic filter layer 222 and make the 3rd coloured light zone 238 externally produce blue lights.Just, knowing this field person can be by selecting suitable material and adjusting process parameter, the luminescent spectrum of these organic luminous layers 210,212,214 is directly conformed to its required color, or through the 3rd chromatic filter layer 222 with special spectrum, make and the more approaching required color of coloured light of the 3rd organic luminous layer 214 further promote the color saturation that dynamo-electric stimulated luminescence display is arranged.Certainly, ruddiness (R), green glow (G) and blue light (B) also non-limitingly must be sent in regular turn in the 236 and the 3rd coloured light zone 238, the first coloured light zone 234, second coloured light zone, and it is wherein of the same colour that primaries can be sent according to design alternative in each coloured light zone.
Therefore, according to another preferred embodiment of the present invention, when the luminescent spectrum that is sent when the 3rd organic luminous layer 214 meets the required coloured light of picture element electrode zone for the third time 208, then can select to omit the 3rd chromatic filter layer 222 that is positioned at the 3rd organic luminous layer 214 belows, only corresponding respectively configuration first chromatic filter layer 218 and second chromatic filter layer 220 below first organic luminous layer 210 and second organic luminous layer 212.It should be noted that the 3rd chromatic filter layer 222 of still can arranging in pairs or groups among the present invention, to filter the non-trichromatic luminescent spectrum that 214 of the 3rd organic luminous layers may send.
On the other hand, according to another preferred embodiment of the present invention, when above-mentioned first organic luminous layer 210 and the responsible separately a kind of three primary colors of second organic luminous layer 212, and the 3rd organic luminous layer 214 sends the coloured light that comprises the third luminescent spectrum, for example when white light or blue light, three chromatic filter layers of can arranging in pairs or groups are to filter out trichromatic luminescent spectrum.More particularly, this moment first organic luminous layer 210 and second organic luminous layer 212 luminescent spectrum in fact respectively comprise three primary colors one of them, and the luminescent spectrum of the 3rd organic luminous layer 214 then is a white-light spectrum.For example, the luminescent spectrum of first organic luminous layer 210 is red-light spectrum (R), and the luminescent spectrum of second organic luminous layer 212 is green spectrum (G), and the luminescent spectrum of the 3rd organic luminous layer 214 is white light (W).
Therefore, this embodiment is that three chromatic filter layers of collocation filter wherein non-trichromatic luminescent spectrum.For example, the ruddiness of first chromatic filter layer 218 (R) spectrum is in order to filter the luminescent spectrum of the non-ruddiness that the 3rd organic luminous layer 214 sent.The green glow of second chromatic filter layer 220 (G) spectrum is in order to filter the luminescent spectrum of the non-green glow that the 3rd organic luminous layer 214 sent.The blue light of the 3rd chromatic filter layer 222 (B) spectrum is in order to filter the luminescent spectrum of the non-blue light that the 3rd organic luminous layer 214 sends.So, this preferred embodiment also can obtain complete three primary colors by this kind combination.
The above-mentioned chromatic filter layer that is used for each preferred embodiment according to other preferred embodiment of the present invention, also can partly or entirely replace with color converting layer (CCM).Below needing to send ruddiness (R), green glow (G) and blue light (B) respectively with the first coloured light zone 234, the 236 and the 3rd coloured light zone 238, second coloured light zone again is example, further is illustrated.First chromatic filter layer 218, second chromatic filter layer 220 and the 3rd chromatic filter layer 222 among Fig. 2 are replaced as first color converting layer (CCM), second color converting layer (CCM) and the 3rd color converting layer (CCM) respectively.In other words, just between first time picture element electrode zone 204 and the transparency carrier 200 (being above-mentioned first chromatic filter layer 218 places), can be first color converting layer (CCM); Between picture element electrode zone 206 and the transparency carrier 200 (being above-mentioned second chromatic filter layer 220 places), can be second color converting layer (CCM) for the second time; (being above-mentioned the 3rd chromatic filter layer 222 places) between picture element electrode zone 208 and the transparency carrier 200 can be the 3rd color converting layer (CCM) for the third time.
The absorption spectrum of each color converting layer (CCM) is the luminescent spectrum corresponding to the organic luminous layer 210,212,214 of its top.When organic luminescent layer 210,212,214 sends non-three primary colors luminescent spectrum, this color converting layer (CCM) can moderately be changed the luminescent spectrum of organic luminous layer 210,212,214, discharge again and meet desirable trichromatic coloured light, improve luminous efficiency and color saturation, make organic electro-luminescent display reach the effect of full-colorization.
As mentioned above, when a kind of three primary colors are responsible for separately in above-mentioned three coloured light zones 234,236 and 238, two color converting layers (CCM) of can below sub picture element electrode zone 204,206, arranging in pairs or groups, or even the color converting layer (CCM) of below the organic luminous layer 214 of sub picture element electrode zone 208, also arranging in pairs or groups, to modify the non-trichromatic luminescent spectrum that three organic luminous layers 210,212,214 are sent respectively.Same, if the 3rd organic luminous layer 214 oneself have desirable blue spectrum, then in the 3rd coloured light zone 238, just need not use the 3rd color converting layer (CCM).Perhaps, when above-mentioned first organic luminous layer 210 and second organic luminous layer 212 are responsible for wherein two of a kind of three primary colors separately, and the 3rd organic luminous layer 214 sends and comprises the coloured light that produces the third luminescent spectrum, three color converting layers (CCM) of then arranging in pairs or groups respectively are to modify non-trichromatic luminescent spectrum.
In addition, above-mentioned preferred embodiment also comprises smooth screen 224 between first electrode 202 and transparency carrier 200.According to preferred embodiment of the present invention, this smooth screen 224 is a light-transmittable layer, and for example acryl is materials such as resin or dix.And the zone of first organic luminous layer 210, second organic luminous layer 212 and the 3rd organic luminous layer 214 corresponds respectively to the area size in the 236 and the 3rd coloured light zone 238, the first coloured light zone 234, second coloured light zone.
The organic electro-luminescent display that Fig. 3 illustrates preferred embodiment of the present invention as shown in Figure 2 has the generalized section of bit errors.Have the assembly of the relative position structure identical with Fig. 2 in Fig. 3, its label is all continued to use the label among Fig. 2.See also Fig. 2,, therefore, in processing procedure carries out, have the problem that screening-off position is aimed at because the evaporation of luminous organic material layer (not illustrating) all needs to use shielding to cover the position that other does not need evaporation in the organic luminous layer 210,212.If shielding aim to produce deviation, can produce then as shown in Figure 3 that organic luminous layer 312 departs from the situation in the second coloured light zone 236, this moment, the light-emitting area in the second coloured light zone 236 will descend significantly.
But in the present embodiment, the light-emitting area in the second coloured light zone 236 does not have the situation that declines to a great extent and takes place.When the luminescent spectrum of the 3rd organic luminous layer 214 is white light, the coloured light 314 that the 3rd organic luminous layer 214 is sent can be used for the light-emitting area that second organic luminous layer 312 of compensated position skew is detracted, and filters and become the required coloured light in second coloured light zone 236 through second chromatic filter layer 220.Same, if two organic luminous layers 210,212 that skew occurs in first organic luminous layer 210 or is positioned at the 3rd organic luminous layer 214 belows all are offset, the 3rd organic luminous layer 214 all can provide compensation on the light-emitting area to these skews, to improve the uniformity of luminous efficiency and color saturation.
On the other hand, according to aforementioned content as can be known, chromatic filter layer herein is replaceable to be color converting layer (CCM), obtains meeting desirable three primary colors with the luminescent spectrum of changing its top organic luminous layer.When the wavelength of the luminescent spectrum of the 3rd organic luminous layer 214 is lacked (as blue light), the coloured light 314 that the 3rd organic luminous layer 214 is sent can be used for compensated position and be offset the light-emitting area that second organic luminous layer 312 is detracted, and converted through second color converting layer (CCM) be the required coloured light in second coloured light zone 236.Same, if two organic luminous layers 210,212 that skew occurs in first organic luminous layer 210 or is positioned at the 3rd organic luminous layer 214 belows all are offset, the 3rd organic luminous layer 214 all can provide compensation on the light-emitting area to this skew, to improve the uniformity of luminous efficiency and color saturation.
Therefore, if second organic luminous layer 312 causes bit errors because of the contraposition problem in processing procedure, the coloured light that sent of the 3rd organic luminous layer 214 then, see through second chromatic filter layer 220 or second color converting layer (CCM) (not illustrating on the figure) can be filtered or convert to three primary colors one of them, so compensate second organic luminous layer 312 and lose light-emitting area because of skew.And the luminescent spectrum that second chromatic filter layer 220 or second color converting layer (CCM) also can make the 3rd organic luminous layer 214 send is refiltered or is converted to better three primary colors.So at the problem of shielding contraposition precision, another preferred embodiment of the present invention proposes effective solution,, also can realize full-colorization of organic electro-luminescent display even the shielding contraposition exceeds the trueness error scope.
Preferred embodiment of the present invention is an example with Fig. 2, and first and second organic luminous layer 210,212 each person comprise electric hole implanted layer, electric hole transport layer and luminous organic material layer (not illustrating among the figure) separately in regular turn.The 3rd organic luminous layer 214 comprises electric hole implanted layer, electric hole transport layer, luminous organic material layer, electron transfer layer and electron injecting layer (, do not illustrate among the figure) in regular turn above picture element electrode zone 208 for the third time.And the 3rd organic luminous layer 214 then comprises organic luminous material layer, electron transfer layer and electron injecting layer (not illustrating among the figure) in regular turn above first and second organic luminous layer 210,212.And the material of the luminous organic material layer in first, second and third organic luminous layer 210,212,214 can be single luminescent material or Subjective and Objective doping (co-host/co-dopant).When this organic electro-luminescent display was the form of luminous (Bottom Emission) downwards, first electrode 202 was a transparency electrode.This moment, the material of first electrode 202 can be tin indium oxide (ITO), indium zinc oxide (IZO), indium oxide tungsten (IWO), aluminium-doped zinc oxide (AZO).The material of second electrode 216 can be any metal material, alloy material or transparent conductive material.Transparency carrier 200 can be glass (glass) substrate, flexibility (flexible) substrate, rigidity (rigid) substrate or plastics (plastic) substrate, even, embodiment as shown in Figure 1, in the time need not using chromatic filter layer, more can be selected to non-transparency carrier and finish organic electro-luminescent display with chromatic filter layer.
According to above-mentioned preferred embodiment, because the luminescent spectrum of the organic luminous layer of corresponding its top of each chromatic filter layer wherein, reach approximately greater than 70% so its penetrance is preferable, therefore luminous utilization rate is preferable, can improve existing white light see through chromatic filter layer approximately less than 25% low penetration rate problem.And, also because its luminous utilization rate is good, only need lower driving voltage so use to go up, can prolong the useful life of organic electro-luminescent display.
Moreover the chromatic filter layer or the color converting layer (CCM) that see through the collocation corresponding color filter or change, and can obtain preferable color saturation, so in full-colorization preferable performance are arranged.According to experimental result, its color saturation can reach more than 100% again, has improved the not good problem of color saturation that existing white light variegates filter layer.
Please refer to Fig. 4, illustrate the flow chart of the organic electro-luminescent display manufacture method of a preferred embodiment of the present invention.On the other hand, below explanation please be simultaneously with reference to Fig. 1.In the step 410, first electrode 102 is formed at transparency carrier 100 tops.Then, step 420 is for the first time picture element electrode zone 104, picture element electrode zone 106 and picture element electrode zone 108 for the third time for the second time of definition on first electrode 102.Then, step 422 is electric hole implanted layer and the electric hole transport layers (not illustrating among Fig. 1) that form first, second and third organic luminous layer 110,112,114 above first, second and third sub picture element electrode zone 104,106 and 108.
Step 430 is for example to use first shielding, hide picture element electrode zone 106 and picture element electrode zone 108 for the second time for the third time, and the first luminous organic material layer that forms first organic luminous layer 110 in first time picture element electrode zone 104 electric hole implanted layer and the top of electric hole transport layer.Step 440 is for example to use secondary shielding, hide picture element electrode zone 104 and picture element electrode zone 108 for the first time for the third time, and the second luminous organic material layer that forms second organic luminous layer 112 in second time picture element electrode zone 106 electric hole implanted layer and the top of electric hole transport layer.Then, step 450 be to use the 3rd luminous organic material layer that full-open type shielding (open mask) forms the 3rd organic luminous layer 114 in picture element electrode zone 108 for the third time electric hole implanted layer and the top of electric hole transport layer, and be covered in the top of the luminous organic material layer of first organic luminous layer 110 and second organic luminous layer 112, wherein the luminous organic material layer of these organic luminous layers 110,112,114 has different luminescent spectrums respectively.Step 452 is to form electron transfer layer and electron injecting layer (not illustrating among Fig. 1) on the luminous organic material layer of the 3rd organic luminous layer 114.Step 460 is to form second electrode 116 in the top of the electron transfer layer and the electron injecting layer of the 3rd organic luminous layer 114.
More particularly, above-mentioned preferred embodiment is to use full-open type shielding (open mask) to form the 3rd organic luminous layer 114, makes that the 3rd organic luminous layer 114 is to be covered in first organic luminous layer 110 and second organic luminous layer, 112 tops.So, can improve the alignment issues that shields in the existing evaporation processing procedure, and can increase the permission of the bit errors of shielding, and reduce the degree of difficulty of making the organic luminous layer that forms different glow colors 110,112,114 o'clock.
Fig. 5 illustrates the flow chart of the organic electro-luminescent display manufacture method of another preferred embodiment of the present invention, wherein describes the details step of example in other processing procedure in more detail.Below explanation please be simultaneously with reference to Fig. 2.When above-mentioned three organic luminous layers are responsible for a kind of three primary colors separately, can form three or two chromatic filter layers in addition, to filter non-trichromatic luminescent spectrum.This preferred embodiment is carry out step 502 earlier, forms first chromatic filter layer 218, second chromatic filter layer 220.On the other hand, when first organic luminous layer 210 and second organic luminous layer 212 are responsible for different three primary colors separately, and the 3rd organic luminous layer 214 is when sending white light, and three chromatic filter layers of can arranging in pairs or groups are to filter out non-trichromatic luminescent spectrum.
More particularly, this moment first organic luminous layer 210 and second organic luminous layer 212 luminescent spectrum in fact respectively comprise three primary colors one of them, and the luminescent spectrum of the 3rd organic luminous layer 214 is white light or comprises the third trichromatic luminescent spectrum.At this moment, except forming above-mentioned first chromatic filter layer 218 and second chromatic filter layer 220, more form the 3rd chromatic filter layer 222 between picture element electrode zone 208 and the transparency carrier 200, to filter the non-trichromatic luminescent spectrum that the 3rd organic luminous layer 214 is sent for the third time.So, this preferred embodiment also can obtain complete three primary colors by this kind combination.
Each chromatic filter layer in above-mentioned each preferred embodiment according to other preferred embodiment of the present invention, also can partly or entirely replace with color converting layer (CCM).For instance, between picture element electrode zone 204 and the transparency carrier 200 (being above-mentioned first chromatic filter layer 218 places), can be first color converting layer (CCM) for the first time; For the second time picture element electrode zone 206 and transparency carrier 200 between (being above-mentioned second chromatic filter layer 220 places), can be second color converting layer (CCM); (being above-mentioned the 3rd chromatic filter layer 222 places) between picture element electrode zone 208 and the transparency carrier 200 can be the 3rd color converting layer (CCM) for the third time.
Then, this preferred embodiment carry out step 504, carries out smooth shielding step earlier to form smooth screen 224 on chromatic filter layer 218,220,222 or color converting layer (CCM).This smooth screen 224 for example is a light-transmittable layer, and preferable material is that acryl is materials such as resin, dix.
In the step 510, first electrode 202 is formed at smooth screen 224 tops.Step 520 is to define for the first time picture element electrode zone 204, picture element electrode zone 206 and picture element electrode zone 208 for the third time for the second time on first electrode 202.Then, step 522 is electric hole implanted layer and the electric hole transport layers (not illustrating among Fig. 2) that form first, second and third organic luminous layer 210,212,214 above first, second and third sub picture element electrode zone 204,206 and 208.
Step 530 is for example to use first shielding, hide picture element electrode zone 206 and picture element electrode zone 208 for the second time for the third time, and the first luminous organic material layer that forms first organic luminous layer 210 in first time picture element electrode zone 204 electric hole implanted layer and the top of electric hole transport layer.Step 540 is for example to use secondary shielding, hide picture element electrode zone 204 and picture element electrode zone 208 for the first time for the third time, and the second luminous organic material layer that forms second organic luminous layer 212 in second time picture element electrode zone 206 electric hole implanted layer and the top of electric hole transport layer.
Then, step 550 is to use the 3rd luminous organic material layer that full-open type shielding (open mask) forms the 3rd organic luminous layer 214 in the electric hole implanted layer of picture element electrode zone 208 and the top of electric hole transport layer for the third time, and be covered in the top of the luminous organic material layer of first organic luminous layer 210 and second organic luminous layer 212, wherein the luminous organic material layer of these organic luminous layers 210,212,214 has different luminescent spectrums respectively.Step 552 is to form electron transfer layer and electron injecting layer (not illustrating among Fig. 2) on the luminous organic material layer of the 3rd organic luminous layer 214.Step 560 is to form second electrode 216 in the top of the electron transfer layer and the electron injecting layer of the 3rd organic luminous layer 214.Above-mentioned preferred embodiment is to use hot evaporation (thermal evaporate) to form the luminous organic material layer of these organic luminous layers 210,212,214.And the material of the luminous organic material layer of these organic luminous layers 210,212,214 is to select single luminescent material or Subjective and Objective to mix.When this organic electro-luminescent display was the form of luminous (Bottom Emission) downwards, first electrode 202 was a transparency electrode.For example: can use tin indium oxide (ITO), indium zinc oxide (IZO), indium oxide tungsten (IWO) or aluminium-doped zinc oxide (AZO) to form first electrode 202, and use any metal material, alloy material or transparent conductive material to form second electrode 216.Transparency carrier 200 can be glass substrate, flexibility (flexible) substrate, rigidity (rigid) substrate or plastics (plastic) substrate.
In sum, preferred embodiment of the present invention is used a full-open type to shield and is improved the alignment issues that tradition shields in the fabrication steps of the organic luminous layer that forms different color light.So, can solve the contraposition accuracy problem between shielding and substrate, promptly increase the permission of bit errors when making, and can reduce to make degree of difficulty and promote and make yields.
On the other hand, if configuration and the corresponding organic luminous layer of its color above each chromatic filter layer, then can promote coloured light that organic luminous layer sends penetrance and color saturation for chromatic filter layer.And chromatic filter layer is replaceable to be color converting layer, through the filtration or the conversion of chromatic filter layer or color converting layer (CCM), can promote and strengthen the luminous efficiency and the color saturation of organic electro-luminescent display.In view of the above, this organic electro-luminescent display has preferable luminous utilization rate, only need lower driving voltage in the use, therefore can reduce the power consumption of organic electro-luminescent display and increase the service life, so as to realizing full-colorization of organic electro-luminescent display, and then be provided at the related application of maximization display.
The aforesaid preferred embodiment of the present invention is not in order to limit other variation of the present invention and application.For instance, this organic electro-luminescent display can be used in upwards luminous (TopEmission) or luminous (Bottom Emission) respectively downwards, also can be used in passive type or active organic electro-luminescent display respectively.And wherein employed chromatic filter layer, its making can be respectively chromatic filter layer at transparency carrier, capping (Color Filter on Encap.Glass), chromatic filter layer (Color Filter on Array on active transistor; COA) or chromatic filter layer (Array on Color Filter under active transistor; Mode such as AOC).Similarly, wherein employed color converting layer (CCM), its making can be respectively color converting layer transparency carrier, capping, color converting layer on active transistor or color converting layer in the inferior mode of active transistor.
Though the present invention with a preferred embodiment openly as above; right its is not in order to limiting the present invention, anyly is familiar with this operator, without departing from the spirit and scope of the present invention; when can doing various changes and modification, thus protection scope of the present invention should with claims were defined is as the criterion.
Claims (13)
1. an organic electro-luminescent display is characterized in that, comprises:
A plurality of picture elements unit is positioned on the transparency carrier, and wherein each picture element unit comprises:
One first electrode is arranged at described transparency carrier top, has picture element electrode zone, a picture element electrode zone and a picture element electrode zone for the third time for the second time for the first time on wherein said first electrode;
One first organic luminous layer is positioned at the described first time of picture element electrode zone top;
One second organic luminous layer is positioned at the described second time of picture element electrode zone top;
One the 3rd organic luminous layer is positioned at described picture element electrode zone for the third time top, and is covered in described first organic luminous layer and described second organic luminous layer top, and wherein these organic luminous layers have different luminescent spectrums; And
One second electrode is arranged at described the 3rd organic luminous layer top.
2. organic electro-luminescent display as claimed in claim 1 is characterized in that, also comprises:
One first chromatic filter layer is between described first time picture element electrode zone and described transparency carrier; And
One second chromatic filter layer is between described second time picture element electrode zone and described transparency carrier;
Wherein, the spectrum of each chromatic filter layer is the luminescent spectrum of organic luminous layer corresponding to its top, and the luminescent spectrum of wherein said first organic luminous layer, second organic luminous layer and the 3rd organic luminous layer in fact respectively comprise three primary colors one of them.
3. organic electro-luminescent display as claimed in claim 1 is characterized in that, described first organic luminous layer comprises one first electric hole implanted layer, one first electric hole transport layer and one first luminous organic material layer in regular turn; Described second organic luminous layer comprises one second electric hole implanted layer, one second electric hole transport layer and one second luminous organic material layer in regular turn and is positioned on described second time of the picture element electrode zone; And described the 3rd organic luminous layer comprises one the 3rd electric hole implanted layer, one the 3rd electric hole transport layer and one the 3rd luminous organic material layer in regular turn and is positioned on the described picture element electrode zone for the third time, described the 3rd luminous organic material layer covers on the first luminous organic material layer and the second luminous organic material layer, and an electron transfer layer is positioned on described the 3rd luminous organic material layer and an electron injecting layer is positioned on the described electron transfer layer.
4. organic electro-luminescent display as claimed in claim 1 is characterized in that, also comprises:
One first chromatic filter layer is between described first time picture element electrode zone and transparency carrier;
One second chromatic filter layer is between described second time picture element electrode zone and transparency carrier; And
One the 3rd chromatic filter layer is between described picture element electrode zone for the third time and transparency carrier;
Wherein, the spectrum of each chromatic filter layer is the luminescent spectrum corresponding to the described organic luminous layer of its top, and the luminescent spectrum of wherein said first organic luminous layer and second organic luminous layer in fact respectively comprise three primary colors one of them, and the luminescent spectrum of described the 3rd organic luminous layer is a white-light spectrum.
5. organic electro-luminescent display as claimed in claim 1 is characterized in that, also comprises:
One first color converting layer (CCM) is between described first time picture element electrode zone and transparency carrier; And
One second color converting layer (CCM) is between described second time picture element electrode zone and transparency carrier;
Wherein, respectively comprise on the spectrum essence of giving out light of each color converting layer (CCM) three primary colors one of them, and wherein the spectrum of each color converting layer (CCM) is the luminescent spectrum of described organic luminous layer corresponding to its top.
6. organic electro-luminescent display as claimed in claim 1 is characterized in that, also comprises one the 3rd color converting layer (CCM), between described picture element electrode zone for the third time and transparency carrier.
7. the manufacture method of an organic electro-luminescent display comprises following steps:
Form one first electrode in transparency carrier top;
Definition one for the first time picture element electrode zone, for the second time picture element electrode zone and for the third time picture element electrode zone on described first electrode;
Use the one first shielding covering described second time of picture element electrode zone to reach picture element electrode zone for the third time, and form one first organic luminous layer in the described first time of picture element electrode zone top;
Use a secondary shielding to hide described first time of picture element electrode zone and picture element electrode zone for the third time, and form one second organic luminous layer in the described second time of picture element electrode zone top;
Form one the 3rd organic luminous layer in described picture element electrode zone for the third time top, and be covered in described first organic luminous layer and second organic luminous layer top, wherein, these organic luminous layers have different luminescent spectrums; And
Form one second electrode in described the 3rd organic luminous layer top.
8. the manufacture method of organic electro-luminescent display as claimed in claim 7 is characterized in that, also comprises to use a full-open type to shield to form described the 3rd organic luminous layer.
9. the manufacture method of organic electro-luminescent display as claimed in claim 7 is characterized in that, also comprises:
Form one first chromatic filter layer between described first time picture element electrode zone and the transparency carrier; And
Form one second chromatic filter layer between described second time picture element electrode zone and the transparency carrier;
Wherein, the spectrum of each chromatic filter layer is the luminescent spectrum of organic luminous layer corresponding to its top, and the luminescent spectrum of wherein said first organic luminous layer, second organic luminous layer and the 3rd organic luminous layer in fact respectively comprise three primary colors one of them.
10. the manufacture method of organic electro-luminescent display as claimed in claim 7 is characterized in that, also comprises:
Corresponding one first electric hole implanted layer, one second electric hole implanted layer and one the 3rd electric hole implanted layer of forming is in described first time picture element electrode zone, picture element electrode zone and for the third time on the picture element electrode zone for the second time;
Corresponding one first electric hole transport layer, one second electric hole transport layer and one the 3rd electric hole transport layer of forming is on the described first electric hole implanted layer, the second electric hole implanted layer and the 3rd electric hole implanted layer;
Form one first luminous organic material layer on the described first electric hole transport layer;
Form one second luminous organic material layer on the described second electric hole transport layer;
Form one the 3rd luminous organic material layer on the described the 3rd electric hole transport layer, the first luminous organic material layer and the second luminous organic material layer;
Form an electron transfer layer on described the 3rd luminous organic material layer; And
Forming an electron injecting layer is positioned on the described electron transfer layer.
11. the manufacture method of organic electro-luminescent display as claimed in claim 7 is characterized in that, also comprises:
Form one first chromatic filter layer between described first time picture element electrode zone and the transparency carrier;
Form one second chromatic filter layer between described second time picture element electrode zone and the transparency carrier; And
Form one the 3rd chromatic filter layer between described picture element electrode zone for the third time and transparency carrier;
Wherein, the spectrum of each chromatic filter layer is the luminescent spectrum corresponding to the described organic luminous layer of its top, and the luminescent spectrum of wherein said first organic luminous layer and second organic luminous layer in fact respectively comprise three primary colors one of them, and the luminescent spectrum of described the 3rd organic luminous layer is a white-light spectrum.
12. the manufacture method of organic electro-luminescent display as claimed in claim 7 is characterized in that, also comprises:
Form one first color converting layer (CCM) between described first time picture element electrode zone and the transparency carrier; And
Form one second color converting layer (CCM) between described second time picture element electrode zone and the transparency carrier;
Wherein, respectively comprise on the spectrum essence of giving out light of each color converting layer (CCM) three primary colors one of them.
13. the manufacture method of organic electro-luminescent display as claimed in claim 7, it is characterized in that, also comprise and form one the 3rd color converting layer (CCM) between described picture element electrode zone for the third time and transparency carrier, and wherein the absorption spectrum of each color converting layer (CCM) is a luminescent spectrum corresponding to the described organic luminous layer of its top.
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| CN 200510131793 CN1983621A (en) | 2005-12-14 | 2005-12-14 | Color organic electrically-excited luminescent display device and its production |
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| CN 200510131793 CN1983621A (en) | 2005-12-14 | 2005-12-14 | Color organic electrically-excited luminescent display device and its production |
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