[go: up one dir, main page]

GB2495107A - Organic light emitting diode display device with further small-area sacrificial diodes - Google Patents

Organic light emitting diode display device with further small-area sacrificial diodes Download PDF

Info

Publication number
GB2495107A
GB2495107A GB1116749.1A GB201116749A GB2495107A GB 2495107 A GB2495107 A GB 2495107A GB 201116749 A GB201116749 A GB 201116749A GB 2495107 A GB2495107 A GB 2495107A
Authority
GB
United Kingdom
Prior art keywords
diode
text
display
pixels
pixel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB1116749.1A
Other versions
GB201116749D0 (en
Inventor
Daniel Forsythe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cambridge Display Technology Ltd
Original Assignee
Cambridge Display Technology Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Cambridge Display Technology Ltd filed Critical Cambridge Display Technology Ltd
Priority to GB1116749.1A priority Critical patent/GB2495107A/en
Publication of GB201116749D0 publication Critical patent/GB201116749D0/en
Priority to JP2014532460A priority patent/JP2014532260A/en
Priority to GB1404977.9A priority patent/GB2509270A/en
Priority to PCT/GB2012/000710 priority patent/WO2013045869A1/en
Priority to KR1020147011161A priority patent/KR20140082745A/en
Priority to CN201280047504.8A priority patent/CN103827948A/en
Publication of GB2495107A publication Critical patent/GB2495107A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/84—Parallel electrical configurations of multiple OLEDs
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/88—Dummy elements, i.e. elements having non-functional features
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0819—Several active elements per pixel in active matrix panels used for counteracting undesired variations, e.g. feedback or autozeroing
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/088—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements using a non-linear two-terminal element
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/043—Preventing or counteracting the effects of ageing
    • G09G2320/045—Compensation of drifts in the characteristics of light emitting or modulating elements

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Electroluminescent Light Sources (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

A display comprises an array of organic light emitting diode (OLED) pixels, at least some of the pixels 2 comprising a first 3 and a further diode 4 connected in parallel (Fig 3) to a drive current. The first diode 3 has a larger area than the further diode 4, and the further diode 4 has a thinner active organic layer than the first diode 3, such that the further diode 4 has a greater drive current density in use than the first diode. The further diode 4 ages faster than the first diode 3 because it is driven harder. As it ages, the conductivity of the further diode 4 decreases, and so more current passes through the first diode 3. The light emitted by the first diode 3 therefore decreases at a slower rate than in the absence of the further diode 4, improving lifetime and reducing image burn-in at a cost of a small reduction in the initial efficiency of the display. The further diodes 4 may be adapted to be non-emissive.

Description

DISPLAY DEVICE
This invention generally relates to displays. More particularly the invention relates to display devices having organic electroluminescent pixels, such as for example Organic Light Emitting Dbde (OLED) display devices.
BACKGROUND TO THE INVENTION
Organic light emitting diodes (OLEDs) comprise a particularly advantageous form of electro-optic display. They are bright, colourful, fast switching, provide a wide viewing angle and are easy and cheap to fabricate on a variety of substrates.
Organic (which here includes organometallic) LEDs may be fabricated using either polymers, non-polymeric molecules, or dendrimers in a range of colours, depending upon the materials used. Examples of polymer-based organic LEDs are described fri WO 90/1 31 48, WO 95/06400 and WO 99/481 60; examples Df non-polymeric molecule based devices are described in US 4,539,507; and examples of dendrimer-based materials are described in W099/2 1935 and A basic structure of a typical organic LED involves a glass or plastic substrate supporting a transparent anode layer comprising, for example, indium tin oxide (ITO) on which is deposited a hole transport layer, an electroluminescent layer and an optional electron transport layer, and a cathode. The hole transport layer may -comprise, for example, PEDOT: F'SS (polystyrene-sulphorate -doped polyethylene -dioxythiophene). The electroluminescent layer may comprise a *01*4 * -polyfluorene polymer, PPV, polythiophene, or a luminescent guest in a non- emissive host. Many such materials are described in the book "Organic Light-Emitting Materials and Devices" edited by Zhigang Li and Hong Meng, published * by CRC Press (Taylor and Francis) [2007J (ISBN 10: 1-57444-574-X). * ** -1 S..
The cathode layer typically comprises a low work function metal such as calcium and may include an additional layer immediately adjacent electroluminescent layer, such as a layer of sodium or lithium fluoride or a conductive polymer, for improved electron energy level matching. Contact wires to the anode and the cathode respectively provide a connection to a power source. The same basic structure may also be employed for small molecule devices. In this structure, light can be emitted through the transparent anode and substrate and devices with this structure are referred to as "bottom emitters". Devices which emit through the cathode may also be constructed, for example, by keeping the thickness of the cathode layer to less than around 50-100mm so that the cathode is substantially transparent.
Organic LEDs may be deposited on a substrate in a matrix of pixels to form a single or multi-colour pixellated display. A multi-coloured display may be constructed using groups of red, green and blue emitting pixels. Pixels emitting different colours need not have equal areas.
In finished display devices, the pixels will be connected to driver circuitry to drive the pixels in response to video input signals, or the like. Such circuitry and OLED devices in general are well known in the art. Further information on conventional OLED materials and devices can be found in a variety of textbooks, such as for example "Organic Light-Emitting Materials and Devices" edited by Zhigang Li and Hong Meng, published by CRC Press (Taylor and Francis) [2007] (ISBN 10:1- 57444-574-X).
In such displays the individual elements are generally addressed by activating row (or column) lines to select the pixels, and rows (or columns) of pixels are written to, to create a display. So-called active matrix displays have a memory element, typically a storage capacitor and a transistor, associated with each pixel whilst passive matrix displays have no such memory element and instead are repetitively scanned, somewhat similarly to a CR1 picture, to give the impression of a steady * ** image.
* I. * *e. * 2
A problem with organic light emitting materials is that the lifetime is short compared with other technologies. For example, the time taken for the light from a blue pixel to decrease by 50% can be of the order of 20,000 hours. Also, the eye is very sensitive to brightness differences, so if a fixed image is present on a display for a length of time sufficient to reduce the brightness by about 3% in bright areas it results in image bum-in or image sticking, where a persistent ghost image is permanently apparent on the display regardless of the image being displayed subsequently.
SUMMARY OF THE INVENTION
According to a first aspect of the present invention, there is provided a display comprising an array of organic light emitting diode (OLED) pixels each having an active organic layer, at least some of the pixels comprising a first diode and a further diode being connected in parallel to one another and being connected to a source of drive current in use, the first diode having a larger area than the further diode,and the further diode having a thinner active organic layer than that of the first diode, such that the further diode is provided with a greater drive current density in use than the first diode.
In one embodiment, the display comprises an array of organic light emitting diode (OLED) pixels, at least some of the pixels comprising a first diode and a further diode being connected in parallel to a source of drive current in use, the first diode having a larger area than the further diode, and the further diode having a thinner *.. ..
* active organic layer than the first diode, such that the further diode is provided with *.**.
* a greater drive current density in use than the first diode. *4* :
"1 25 In use, the further diode ages faster than the first diode because it is driven harder.
4***:* * As it ages the conductivity of the further diode decreases so that more current : *** passes through the first diode. Thus the light emitted by the first diode decreases at a slower rate than in the absence of the further pixel, thus improving lifetime and reducing the problem of image burn-in in exchange for a small reduction in the initial efficiency of the display.
Other preferred arrangements are described in the dependent claims.
In particular, the further diodes can be adapted to be non-emissive, or may further comprise an opaque body arranged to prevent any light being emitted by the further diode from being emitted by the display.
The array of pixels may comprise a plurality of groups of pixels having different colors, and wherein the at least some pixels comprising said first diode and said further diode all belong to a group of pixels having the same color (for example, blue).
Preferably, each further pixel has an area of less than 20% of the area of each first pixel, very preferably less than or equal to 10% of the area of each first pixel.
The thickness of the active area of the further pixels is advantageously at least 10% thinner than the thickness of the first pixels. Preferably at least 20% thinner than the thickness of the first pixels.
The active organic layer of the first diode and further diode may each comprise a plurality of layers each layer comprising a different material or different materials.
The active organic layer or layers can comprise a polymer material, a non-polymeric material, or a mixture of both types of material.
S..... * .
S
* e *S.* * *
BRIEF DESCRIPTION OF THE DRAWINGS ** S
00 Embodiments of the invention will now be described, bywayof example only, with *.*..
* reference to the accompanying drawings, in which: * .* * * S S... *5*
Figure 1 shows a plan view of (a) a standard prior art pixel and (b) a pixel according to the present invention, Figure 2 shows a cross-section of a pixel according to the present invention, Figure 3 shows how the first and further diode are connected in parallel to one another, Figure 4 shows how the luminance of a prior art pixel and a pixel according to the present invention changes with time.
Figure 5 shows the decay in luminance of the first diode together with the reduction in current through the smaller further diode.
DETAILED DESCRIPTION
The present invention provides a display in which the active pixels have an in-built mechanism for changing the current density in the pixel during driving. This relies on using a small area "sacrificial" diode running in parallel with the active pixel.
The small area diode can be made using the same materials as those of the main pixel. In this case the small area diode will emit light when driven. To prevent this light from being emitted by the display, a light blocking element comprising an opaque layer (such as a thick metal electrode) can be provided located in the path of light from the small area diode. Alternatively, it is possible to use materials in the small area pixel which result in minimal intrinsic Fight emission. It is important that light from this small area diode is not emitted by the display, because the fact that it is driven harder and ages quicker than the main pixel means that image sticking or burn-in might be visible to the eye from the small diode. 0.* S * S ".5
As the active pixel is driven the small area non emissive pixel is running at a higher current density. This causes the small area pixel to degrade faster than the emissive pixel. As it degrades the conductivity reduces, so more current is S..
S
switched to the active pixel. This increase in current in the active pixel compensates for the drop in PL efficiency due to driving. The result is the initial decay of luminescence is significantly improved. In other words, the light emitted by the first diode decreases at a slower rate than in the absence of the further pixel, improving lifetime and reducing image bum-in at a cost of a small reduction in the initial efficiency of the display.
Figure 1 shows a plan view of (a) a standard prior art pixel 1 and (b) a pixel according to the present invention (2). Pixel 2 includes a first diode 3 and a further diode 4 which comprises, in essence, a parallel pixel that consists of the same LEP device stack, but has a thinner LEP and a smaller area than pixel 2. This ensures the current density through this pixel is higher than the active pixel, but the total current drawn is kept to a minimum, ensuring high panel efficiency.
The pixel 2 according to the present invention is shown in cross-section in Figure 2. This figure shows a substrate (6), typically glass, on which a patterned layer of ITO (8) is provided to act as an anode. In this embodiment, an opaque metal layer (10) is provided between the further diode 4 and the viewing surface of the display (12) so that light from further diode 4 is not emitted by the display in use. A bank layer (14) is provided on top of the ITO, and is patterned to provide a perimeter wall defining and independently surrounding the first diode and the further diode.
The bank wall thus forms two wells, one for the first diode (3) and one for the further diode (4). Active organic materials can then be deposited into the wells by ink jet printing.
The active materials comprising the OLED device stack (16) may for example include a hole transport layer deposited by ink-jet printing, which is baked or optionally cross-linked prior to deposition of a light emitting organic layer through a * subsequent ink-jet printing step. * S
* ** The "sacrificial" further diode (4) is preferably arranged to have a thinner OLED device stack (18), for example by depositing a Thinner light emitting organic layer.
The deposition of a thinner layer can be achieved with a printing recipe, the big (first) diode will require a certain number of drops to achieve the target thickness, in the small (further) diode the number of drops can be reduced to achieve a thinner light emitting layer.
S An alternative approach is to run two print passes for the light emitting layer, the first one to fill in the first diode, the second to fill in the smaller further diode.
A specific example of a device made according to the present invention will now be described in detail.
A device was fabricated on a glass substrate.having a transparent ITO anode. The diode and further diode were defined by banks made of an insulating material. A hole injection layer 35 rim in thickness was deposited by inkjet printing onto the anode within the banks, followed by baking and the deposition of an interlayer material 22 nm in thickness. The structure was again baked to remove solvent.
The diode area was 10 square millimeters, and the further diode area was 1 square millimeter. Next, a light emitting polymer layer 90 nm thick was deposited into bank defining the diode, and a layer of the same material 55 nm thick was deposited into the further diode. These layers were again baked to remove excess solvent. A cathode comprising separate sequential layers of NaF and aluminium was then evaporated onto the top of the devices through a shadow mask.
The hole injection material used was Poly(thiophene-3-[2-(2-methoxyethoXy) ethoxy]-2,5-diyl), sulfonated solution (commercially available from Sigma-Aldrich).
*.. S. The interlayer material comprised a copolymer having the following repeat units *0*5
S S "55
n-c6H13 (repeat unit (a), described in WO 2001/096454) Nfl/)N C8H?c8H17 (repeat unit (b) described in W02005/049546), and Br (repeat unit (C)' described in W020051052027.) The solvent used for this copolymer was ortho-xylena The light emitting polymer layer comprised a copolymer having the following repeat units: (d) (9, 9) di-octyl fluorene, (e) (9, 9,) di-hexyl fluorene, and (0 phenoxazine. The solvent used for this copolymer was also ortho-xylene.
These copolyrriers were synthesized by the well known Suzuki process.
The decay in luminence of the device described above and a normal pixel without : 15 the further diode is shown in Figure 4. The X axis is the measured luminance divided by the initial luminance at a drive current of 8mNcm2. They axis is time in hours. It will be seen that for the pixel of the present invention the time taken to reach 80% of the initial luminance is more than doubled from7 hours to 16 hours.
* Figure 5 shows a plot of the initial decay of the luminance of the first (large area) ::". 20 diode together with the reduction in current passing through the smaller further diode as it ages. In this figure the top graph shows the luminance of the first diode according to the axis on the left hand side, which shows measured luminance in arbitrary units. The lower graph shows the current passing through the further diode according to the axis on the right hand side, which is read in milliamps.
Of course, any materials capable of being used to form the layers of an OLED device can be used instead of the specific materials mentioned above in the main and further diode structure of the present invention. Specifically, alternative polymers such as PVK and PPV can be used for the light emitting layer, which can as an alternative also comprise a phosphorescent guest compound in a host polymer. PEDOT and triaryl amine copolymers can be used as the hole transport or interlayer material.
As a further alternative, non-polymeric organic materials can be used as the active layers. Such materials include A1q3, PBD, NPD, triaryl amines, etc. Such materials are sometimes called small molecule" (sm) materials, and may comprise dimer, trimer or tetramer structures, or dendrimers.
Descriptions of suitable polymer and non-polymeric materials can be found in a variety of textbooks, such as for example "Organic Light-Emitting Materials and Devices" edited by Zhigang Li and Hong Meng, published by CRC Press (Taylor and Francis) [2007] (ISBN 10: 1-57444-574-X), especially chapters 2 and 3.
The diode and further diode may comprise 2 or more active layers, for example electron transport layers, hole transport layers, exciton blocking layers, hole and electron injecting layers, in addition to light emitting layers. In general, small molecule (non-polymeric) OLEDs tend to have many active layers in the device.
Although the devices in the present embodiment were fabricated using ink-jet printing, other solution processing techniques such as nozzle printing, spin coating, slot die coating, and gravure or flexographic printing can be used as an * alternative. The devices may also comprise layers deposited using vapour deposition techniques such as for example evaporation or sputtering.
It will be appreciated that although only a few particular embodiments of the invention have been described in detail, various modifications and improvements can be made by a person skilled in the art without departing from the scope of the present invention as defined in the following claims.
*efl S. * .
S
* 5*e. * S *Ste * * * * * * U. * . * **** * * ** *

Claims (1)

  1. <claim-text>CLAIMS1. A display comprising an array of organic light emitting diode (OLED) pixels each having an active organic layer, at least some of the pixels comprising a first diode and a further diode being connected in parallel to one another S and being connected to a source of drive current in use, the first diode having a larger area than the further diode, and the further diode having a thinner active organic layer than that of the first diode, such that the further diode is provided with a greater drive current density in use than the first diode.</claim-text> <claim-text>2. A display as claimed in claim 1 in which the further diodes are adapted to be non-emissive.</claim-text> <claim-text>3. A display as claimed in claim 1, further comprising an opaque body arranged to prevent any light being emitted by the further diode from being emitted by the display.</claim-text> <claim-text>4. A display as claimed in any preceding claim in which the array of pixels comprise a plurality of groups of pixels having different colors, and wherein the at least some pixels comprising said first diode and said further diode all belong to a group of pixels having the same color.</claim-text> <claim-text>5. A display as claimed in claim 4 in which the same color is blue.</claim-text> <claim-text>6. A display as claimed in any preceding claim in which each further pixel has an area of less than 20% of the area of each first pixel.</claim-text> <claim-text>7. A display as claimed in any preceding claim in which each further pixel has an area of less than 10% of the area of each first pixel.</claim-text> <claim-text>*" 8. A display as claimed in any preceding claim in which the thickness of the active area of the further pixels is at least 10% thinner than the thickness of the first pixels.</claim-text> <claim-text>9. A display as claimed in any preceding claim in which the thickness of the * active area of the further pixels is at least 20% thinner than the thickness of : *". thefirstpixels. **** *</claim-text> <claim-text>1O.A display as claimed in any preceding claim in which the active organic layer of the first diode and further diode each comprise a plurality of layers each layer comprising a different material or different materials.</claim-text> <claim-text>11.A display as claimed in any preceding claim in which the active organic layer or layers comprise a polymer material.</claim-text> <claim-text>12.A display as claimed in any one of claims ito 10 in which the active organic layer or layers comprise non-polymeric material. o.. * . *Se.... * . * . *...CS..... * . * .. * S *</claim-text>
GB1116749.1A 2011-09-28 2011-09-28 Organic light emitting diode display device with further small-area sacrificial diodes Withdrawn GB2495107A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
GB1116749.1A GB2495107A (en) 2011-09-28 2011-09-28 Organic light emitting diode display device with further small-area sacrificial diodes
JP2014532460A JP2014532260A (en) 2011-09-28 2012-09-12 Display device
GB1404977.9A GB2509270A (en) 2011-09-28 2012-09-12 Oled display device having some of the pixels containing two diodes with organic layers of different thickness
PCT/GB2012/000710 WO2013045869A1 (en) 2011-09-28 2012-09-12 Oled display device having some of the pixels containing two diodes with organic layers of different thickness
KR1020147011161A KR20140082745A (en) 2011-09-28 2012-09-12 Oled display device having some of the pixels containing two diodes with organic layers of different thickness
CN201280047504.8A CN103827948A (en) 2011-09-28 2012-09-12 Oled display device having some of the pixels containing two diodes with organic layers of different thickness

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1116749.1A GB2495107A (en) 2011-09-28 2011-09-28 Organic light emitting diode display device with further small-area sacrificial diodes

Publications (2)

Publication Number Publication Date
GB201116749D0 GB201116749D0 (en) 2011-11-09
GB2495107A true GB2495107A (en) 2013-04-03

Family

ID=44994143

Family Applications (2)

Application Number Title Priority Date Filing Date
GB1116749.1A Withdrawn GB2495107A (en) 2011-09-28 2011-09-28 Organic light emitting diode display device with further small-area sacrificial diodes
GB1404977.9A Withdrawn GB2509270A (en) 2011-09-28 2012-09-12 Oled display device having some of the pixels containing two diodes with organic layers of different thickness

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB1404977.9A Withdrawn GB2509270A (en) 2011-09-28 2012-09-12 Oled display device having some of the pixels containing two diodes with organic layers of different thickness

Country Status (5)

Country Link
JP (1) JP2014532260A (en)
KR (1) KR20140082745A (en)
CN (1) CN103827948A (en)
GB (2) GB2495107A (en)
WO (1) WO2013045869A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5982345A (en) * 1996-02-09 1999-11-09 Tdk Corporation Organic electroluminescent image display device
US20070063192A1 (en) * 2005-09-20 2007-03-22 Toppoly Optoelectronics Corp. Systems for emitting light incorporating pixel structures of organic light-emitting diodes
US20070108443A1 (en) * 2005-11-14 2007-05-17 Kim Eun A Organic light emitting display device

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4539507A (en) 1983-03-25 1985-09-03 Eastman Kodak Company Organic electroluminescent devices having improved power conversion efficiencies
GB8909011D0 (en) 1989-04-20 1989-06-07 Friend Richard H Electroluminescent devices
GB9317932D0 (en) 1993-08-26 1993-10-13 Cambridge Display Tech Ltd Electroluminescent devices
AU9551598A (en) 1997-10-23 1999-05-17 Isis Innovation Limited Light-emitting dendrimers and devices
GB9805476D0 (en) 1998-03-13 1998-05-13 Cambridge Display Tech Ltd Electroluminescent devices
KR100327375B1 (en) * 2000-03-06 2002-03-06 구자홍 apparatus for active driver
EP1297060B2 (en) 2000-06-12 2012-04-04 Sumitomo Chemical Company Limited Polymer matrix electroluminescent materials and devices
GB0104177D0 (en) 2001-02-20 2001-04-11 Isis Innovation Aryl-aryl dendrimers
NO316632B1 (en) * 2001-11-16 2004-03-15 Thin Film Electronics Asa Matrix addressable optoelectronic apparatus and electrode assembly in the same
KR20120003975A (en) 2003-11-14 2012-01-11 스미또모 가가꾸 가부시키가이샤 Halogenated bisdiarylaminopolycyclic aromatic compounds and polymers thereof
TW201219350A (en) 2003-11-17 2012-05-16 Sumitomo Chemical Co Crosslinkable arylamine compounds
JP2008203358A (en) * 2007-02-16 2008-09-04 Eastman Kodak Co Active matrix display device
CN102082181B (en) * 2010-12-15 2013-01-02 四川虹视显示技术有限公司 Thin film transistor structure of pixel circuit for organic light emitting device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5982345A (en) * 1996-02-09 1999-11-09 Tdk Corporation Organic electroluminescent image display device
US20070063192A1 (en) * 2005-09-20 2007-03-22 Toppoly Optoelectronics Corp. Systems for emitting light incorporating pixel structures of organic light-emitting diodes
US20070108443A1 (en) * 2005-11-14 2007-05-17 Kim Eun A Organic light emitting display device

Also Published As

Publication number Publication date
GB2509270A (en) 2014-06-25
KR20140082745A (en) 2014-07-02
GB201404977D0 (en) 2014-05-07
GB201116749D0 (en) 2011-11-09
CN103827948A (en) 2014-05-28
JP2014532260A (en) 2014-12-04
WO2013045869A1 (en) 2013-04-04

Similar Documents

Publication Publication Date Title
US8115216B2 (en) Optoelectronic display and method of manufacturing the same
US20160013251A1 (en) El display device
US20070024183A1 (en) Full-color organic electroluminescence panel with high resolution
TWI261480B (en) Display device, manufacturing method for display device, and electronic apparatus
EP1057167A1 (en) Electroluminescent devices
KR100663028B1 (en) Organic electroluminescent device and manufacturing method thereof
KR102035251B1 (en) Organic light emitting diode display
JP2012160388A (en) Organic el display device and method of manufacturing the same
US20040080276A1 (en) Display and method for manufacturing the same
US7638949B2 (en) Organic electroluminescence device, method for driving thereof, and electronic appliance
CN114335091A (en) Flexible display panel
CN113314586A (en) Display panel, preparation method thereof and display device
CN216145621U (en) Display panel and display device
US20230106276A1 (en) Organic light-emitting diode substrate and manufacturing method thereof
JP2009238708A (en) Manufacturing method for organic electroluminescent apparatus
CN111384118B (en) Organic light emitting display device
KR20090029007A (en) Organic light emitting device and its driving method
GB2495107A (en) Organic light emitting diode display device with further small-area sacrificial diodes
US20170250235A1 (en) Organic light-emitting diode display panel and organic light-emitting diode display device
JP4314000B2 (en) Display device
KR102065108B1 (en) Organic light emitting diode display
KR20200066879A (en) Electroluminescent display device
JP2012109426A (en) Organic el display device and method for manufacturing the same
JP2011071008A (en) Organic el light-emitting device and method for manufacturing the same
JP2018120726A (en) Organic EL display

Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)