WO2015100931A1 - Oled显示面板及显示装置 - Google Patents
Oled显示面板及显示装置 Download PDFInfo
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- WO2015100931A1 WO2015100931A1 PCT/CN2014/078711 CN2014078711W WO2015100931A1 WO 2015100931 A1 WO2015100931 A1 WO 2015100931A1 CN 2014078711 W CN2014078711 W CN 2014078711W WO 2015100931 A1 WO2015100931 A1 WO 2015100931A1
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- 239000010410 layer Substances 0.000 claims abstract description 343
- 230000000903 blocking effect Effects 0.000 claims abstract description 49
- 239000002346 layers by function Substances 0.000 claims abstract description 47
- 230000003287 optical effect Effects 0.000 claims description 59
- 239000000463 material Substances 0.000 claims description 38
- 238000004768 lowest unoccupied molecular orbital Methods 0.000 claims description 29
- 238000004770 highest occupied molecular orbital Methods 0.000 claims description 28
- 230000005525 hole transport Effects 0.000 claims description 13
- 239000003086 colorant Substances 0.000 description 15
- 102100027126 Echinoderm microtubule-associated protein-like 2 Human genes 0.000 description 14
- 101001057942 Homo sapiens Echinoderm microtubule-associated protein-like 2 Proteins 0.000 description 14
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- 101001057939 Homo sapiens Echinoderm microtubule-associated protein-like 3 Proteins 0.000 description 12
- 238000000034 method Methods 0.000 description 10
- 102100027094 Echinoderm microtubule-associated protein-like 1 Human genes 0.000 description 8
- 101001057941 Homo sapiens Echinoderm microtubule-associated protein-like 1 Proteins 0.000 description 8
- 230000000694 effects Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000005284 excitation Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000284 extract Substances 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 229910001111 Fine metal Inorganic materials 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 239000012044 organic layer Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000013590 bulk material Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910003437 indium oxide Inorganic materials 0.000 description 1
- PJXISJQVUVHSOJ-UHFFFAOYSA-N indium(iii) oxide Chemical compound [O-2].[O-2].[O-2].[In+3].[In+3] PJXISJQVUVHSOJ-UHFFFAOYSA-N 0.000 description 1
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 1
- 238000007641 inkjet printing Methods 0.000 description 1
- 238000004776 molecular orbital Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- -1 phosphor organic compound Chemical class 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 150000003384 small molecules Chemical class 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 1
- 238000001931 thermography Methods 0.000 description 1
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
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- 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
- H10K59/30—Devices specially adapted for multicolour light emission
- H10K59/35—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels
- H10K59/353—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels characterised by the geometrical arrangement of the RGB subpixels
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
- H10K50/125—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers specially adapted for multicolour light emission, e.g. for emitting white light
- H10K50/13—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers specially adapted for multicolour light emission, e.g. for emitting white light comprising stacked EL layers within one EL unit
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- H—ELECTRICITY
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/18—Carrier blocking layers
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- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/805—Electrodes
- H10K50/82—Cathodes
- H10K50/828—Transparent cathodes, e.g. comprising thin metal layers
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- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/85—Arrangements for extracting light from the devices
- H10K50/852—Arrangements for extracting light from the devices comprising a resonant cavity structure, e.g. Bragg reflector pair
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- 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
- H10K59/30—Devices specially adapted for multicolour light emission
- H10K59/35—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels
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- H—ELECTRICITY
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K2101/00—Properties of the organic materials covered by group H10K85/00
- H10K2101/30—Highest occupied molecular orbital [HOMO], lowest unoccupied molecular orbital [LUMO] or Fermi energy values
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- H10K2101/00—Properties of the organic materials covered by group H10K85/00
- H10K2101/40—Interrelation of parameters between multiple constituent active layers or sublayers, e.g. HOMO values in adjacent layers
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K2102/00—Constructional details relating to the organic devices covered by this subclass
- H10K2102/301—Details of OLEDs
- H10K2102/351—Thickness
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- 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
- H10K59/805—Electrodes
- H10K59/8052—Cathodes
- H10K59/80524—Transparent cathodes, e.g. comprising thin metal layers
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- 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
- H10K59/875—Arrangements for extracting light from the devices
- H10K59/876—Arrangements for extracting light from the devices comprising a resonant cavity structure, e.g. Bragg reflector pair
Definitions
- Embodiments of the present invention relate to an OLED display panel and a display device. Background technique
- An Organic Light Emitting Diode (OLED) display is a display device that electrically excites a phosphor or a phosphor organic compound to emit light.
- the OLED display drives a plurality of organic light emitting diode display images, each OLED includes an anode, an organic functional layer, and a cathode, and the organic functional layer generally includes an emission layer (EML), an electron transport layer (ETL), and a hole.
- EML emission layer
- ETL electron transport layer
- HTL Hole Transport Layer
- the red (R), green (G), and blue (B) light-emitting layers can be patterned, respectively.
- a shadow mask can be used in the case of a small molecule OLED, and an ink jet printing method or a laser induced thermal imaging (LITI) method can be used in the case of a polymer OLED.
- the organic layer can be finely patterned by the LITI method, and the LITI method can be used for a large area, and the LITI method has the advantage of high resolution.
- the high PPI (Pixels per inch) display device is the main development direction of the current display device, and the high PPI OLED display panel must use the top emission structure.
- An OLED production technology mainly uses a fine metal mask (FMM) and a side by side method to realize a full color display of an OLED. Summary of the invention
- the pixel unit of the OLED display panel includes a first sub-pixel displaying a first color, a second sub-pixel displaying a second color, and a third sub-pixel displaying a third color, each pixel unit including an anode layer, a cathode layer, and An organic functional layer disposed between the anode layer and the cathode layer;
- the functional layer includes: a first luminescent layer covering at least two adjacent sub-pixels including the first sub-pixel; a charge blocking layer covering the second sub-pixel and the third sub-pixel; And covering at least two adjacent sub-pixels including the third sub-pixel; and covering at least two adjacent sub-pixels in a region where the first sub-pixel and the second sub-pixel are located The third luminescent layer of the pixel.
- At least one embodiment of the present invention also provides a display device comprising the OLED display panel as described above.
- FIG. 1 is a schematic structural view of an OLED display panel
- FIG. 2 is a schematic view of fabricating a light-emitting layer using an FMM using a larger opening
- 3 is a schematic diagram showing the size of LUMO levels of each of the light-emitting layer and the charge blocking layer in the first embodiment of the present invention
- FIG. 4 is a schematic structural diagram of an OLED display panel according to Embodiment 1 of the present invention.
- FIG. 5 is a schematic diagram showing the size of HOMO levels of each of the light-emitting layer and the charge blocking layer in Embodiment 2 of the present invention.
- FIG. 6 is a schematic structural diagram of an OLED display panel according to Embodiment 2 of the present invention. detailed description
- each pixel unit includes a first sub-pixel, a second sub-pixel, and a third sub-pixel having three lights emitting different colors, which are simultaneously fabricated in the first sub-pixel and the second sub-pixel.
- the light-emitting layer of two colors such as R and G
- the different thicknesses of the two sub-pixels as shown in FIG. 1 , the thickness of the ITO anode of the first sub-pixel is larger than the thickness of the ITO anode of the second sub-pixel
- the effect extracts one of the colors (eg, the first sub-pixel extracts red, the second sub-pixel extracts green), and then a third color (eg, B) luminescent layer can be formed throughout the pixel region.
- the color shift is very serious as the viewing angle is changed, and the luminous efficiency of the two color light-emitting layers produced at the same time is lost.
- the FMM is used to simultaneously vaporize the light-emitting layers of the same color sub-pixels in different pixels (as shown in FIG. 2, the blue pixel mask with a larger opening is different at the same time) A blue light-emitting layer is evaporated in the pixel).
- the order of sub-pixels in different pixels may be inconsistent (as in the arrangement order of different color sub-pixels in the first pixel 10 and the second pixel 20 in FIG. 2), resulting in lines when the screen is displayed. Discontinuous sawtooth image.
- At least one embodiment of the present invention provides an OLED display panel and a display device capable of increasing the pixel density of an OLED display panel without changing the accuracy of the FMM.
- the pixel unit of the OLED display panel includes a first sub-pixel displaying a first color, a second sub-pixel displaying a second color, and a third sub-pixel displaying a third color.
- Each of the pixel units includes an anode layer, a cathode layer, and an organic functional layer disposed between the anode layer and the cathode layer.
- the organic functional layer includes:
- a first light emitting layer covering at least two adjacent sub-pixels including the first sub-pixel;
- a charge blocking layer covering the second sub-pixel and the third sub-pixel, the charge blocking layer being used for Blocking charges on adjacent sides thereof from passing through the charge blocking layer;
- a third luminescent layer covering at least two adjacent sub-pixels including the third sub-pixel.
- the host material of the charge blocking layer, the main illuminant material of the third luminescent layer, the main illuminant material of the second luminescent layer, and the LUMO of the main illuminant material of the first luminescent layer (The Lowest Unoccupied Molecular Orbital, the track with the lowest energy level of the electrons, ie the lowest unoccupied orbit) has a lower energy level.
- the optical thickness of the first sub-pixel ⁇ ⁇ , the second subpixel ⁇ 2 and the optical thickness of the optical thickness of the third sub-pixel ⁇ 3 satisfies the following relationship:
- the optical thickness of each sub-pixel refers to the sum of the thicknesses of the functional layers in each sub-pixel; and, ⁇ 2 , ⁇ 3 represent the first color light, the second color light, and the third color light, respectively.
- Wavelengths; ⁇ , ⁇ 2 , ⁇ 3 respectively represent refractive indices of the functional layer materials in the respective sub-pixels under the conditions of the first color light, the second color light, and the third color light.
- the main illuminant material of the first luminescent layer, the main illuminant material of the second luminescent layer, and the main illuminant material of the third luminescent layer and the host material of the charge blocking layer are HOMO (Highest) Occupied Molecular Orbital, which has the highest energy level of the electrons, ie the highest occupied orbit, has a lower energy level.
- the optical thickness of the first sub-pixel ⁇ ⁇ , the second subpixel ⁇ 2 and the optical thickness of the optical thickness of the third sub-pixel ⁇ 3 satisfies the following relationship:
- the optical thickness of each sub-pixel refers to the sum of the thicknesses of the functional layers in each sub-pixel; ⁇ 2 and ⁇ 3 represent the wavelengths of the first color light, the second color light, and the third color light, respectively; ⁇ , ⁇ 2 , and ⁇ 3 respectively represent refractive indices of the organic functional layer material in the sub-pixel under the conditions of the first color light, the second color light, and the third color light.
- the optical thickness of the sub-pixel is the thickness of the organic functional layer of the sub-pixel, such as the first sub-pixel.
- the optical thickness ⁇ is the thickness of the organic functional layer of the first sub-pixel.
- Other sub-pixels are similar and will not be described again.
- an optical thickness of the sub-pixel is a sum of a thickness of the organic functional layer of the sub-pixel and a thickness of the transparent conductive layer (a translucent layer may be referred to) .
- the optical thickness ⁇ of the first sub-pixel is the sum of the thickness of the organic functional layer of the first sub-pixel and the thickness of the transparent conductive layer.
- the transparent conductive layer may be a transparent conductive oxide layer (TCO), such as indium tin oxide (ITO), indium oxide (IZO), aluminum oxide (AZO), fluorine doping. Miscellaneous tin oxide (FTO) and so on.
- TCO transparent conductive oxide layer
- ITO indium tin oxide
- IZO indium oxide
- AZO aluminum oxide
- FTO fluorine doping.
- the transparent conductive layer may be used as a cathode electrode layer or a cathode electrode layer, or a part of the electrode layer, or may be used as a thickness adjustment layer.
- the first luminescent layer, the charge blocking layer, the second luminescent layer, and the third luminescent layer may each cover at least two sub-pixels, so that the FMM is minimized when the luminescent layer is fabricated by using the FMM.
- the opening may have at least two sub-pixel regions large, so that the pixel density of the OLED display panel can be improved without changing the precision of the FMM. That is, the OLED display panel provided by at least one embodiment of the present invention can evaporate at least twice the luminescent layer by one process, and can cause each sub-pixel to emit light of a specific color, so that a larger opening can be used.
- the MM display panel is made of FMM with lower precision. If the FMM with the same precision is used, the PPI of the panel can be doubled.
- the OLED display panel of at least one embodiment of the present invention further optimizes the energy level of the main body luminescent material of each luminescent layer and the thickness of each sub-pixel, so that each sub-pixel emits light of a specific color, further avoiding the occurrence of color Bias, and does not lose luminous efficiency, improving picture quality.
- the OLED display panel of at least one embodiment of the present invention does not change the order of the sub-pixels, and does not affect the screen display.
- the values of LUMO and HOMO are generally negative values.
- the higher the energy level is defined the higher the energy level is from the vacuum level, and the lower the energy level is, the lower the energy level is.
- the HOMO energy level is lowered in turn, which means that the absolute value of the HOMO energy level is sequentially increased; similarly, the LUMO energy level is "decreased sequentially" means that the absolute value of the LUMO energy level is sequentially increased.
- only the LUMO energy level of the main illuminant material of each luminescent layer is limited, or the HOMO energy of the main illuminant material of each luminescent layer is simply limited.
- the LUMO energy level and the HOMO energy level of the main illuminant material of each luminescent layer may be limited by considering the relationship between holes and electrons within a specific sub-pixel.
- the illuminating layer of a specific color corresponding thereto is recombined to form an exciton, so that the inside of a specific sub-pixel emits light of a specific color.
- the main illuminant material of the first luminescent layer in the first sub-pixel, the main illuminant material of the first luminescent layer, the second luminescent layer Primary illuminant material and main illuminant material of said third luminescent layer and main body of said charge blocking layer
- the HOMO energy level of the bulk material is sequentially decreased; and in the second sub-pixel, the host material of the charge blocking layer, the main illuminant material of the third luminescent layer, the main illuminant material of the second luminescent layer, and
- the LUMO energy level of the main illuminant material of the first luminescent layer is sequentially lowered.
- the OLED display panel may sequentially include: the first luminescent layer covering the entire pixel unit; and the charge blocking layer covering the second sub-pixel and the third sub-pixel a second luminescent layer covering the first sub-pixel and the second sub-pixel; covering the third luminescent layer of the entire pixel unit.
- the OLED display panel may include: a first luminescent layer covering the entire pixel unit; the charge blocking layer covering the second sub-pixel and the third sub-pixel; The second sub-pixel and the second illuminating layer of the second sub-pixel; covering the third illuminating layer of the second sub-pixel and the third sub-pixel.
- the OLED display panel may include: the first illuminating layer covering the first sub-pixel and the second sub-pixel; covering the second sub-pixel and The charge blocking layer of the third sub-pixel; the second light-emitting layer covering the first sub-pixel and the second sub-pixel; covering the third light-emitting layer of the entire pixel unit.
- the OLED display panel may sequentially include: the first illuminating layer covering the first sub-pixel and the second sub-pixel; covering the second sub-pixel and the The charge blocking layer of the third sub-pixel; the second light-emitting layer covering the first sub-pixel and the second sub-pixel; covering the second sub-pixel and the third sub-pixel The third luminescent layer.
- the optical thickness of the first sub-pixel, the optical thickness ⁇ 2 of the second sub-pixel, and the optical thickness ⁇ 3 of the third sub-pixel satisfy the following relationship: lJ ⁇ / T ⁇ .O;
- an OLED display panel may include: a transparent or translucent anode layer; a hole transport layer on the semi-transmissive anode layer; the first on the hole transport layer a light emitting layer; the charge blocking layer on the first light emitting layer; the second light emitting layer on the charge blocking layer; the third light emitting layer on the second light emitting layer; An electron transport layer on the light emitting layer; a metal cathode layer on the electron transport layer.
- the OLED display panel may include: transparent or half a transparent anode layer; a hole transport layer on the semi-transmissive anode layer; the third light-emitting layer on the hole transport layer; the second light-emitting layer on the third light-emitting layer; The charge blocking layer on the second light emitting layer; the first light emitting layer on the charge blocking layer; the electron transport layer on the first light emitting layer; and the metal cathode layer on the electron transport layer.
- At least one embodiment of the present invention also provides a display device comprising the OLED display panel as described above.
- the structure and working principle of the OLED display panel are the same as those of the above embodiment, and will not be described herein.
- the structure of other parts of the display device can be referred to the prior art, and will not be described in detail herein.
- the display device can be: a product or a component having any display function such as an electronic paper, a television, a display, a digital photo frame, a mobile phone, a tablet, or the like.
- the OLED display panel includes a first sub-pixel displaying blue, a second sub-pixel displaying red, and a third sub-pixel displaying green.
- the OLED display panel includes an anode layer, a cathode layer, and an organic layer.
- Functional layer includes a layer structure: covering at least two adjacent sub-pixels including a first sub-pixel, and a first light-emitting layer (EML1) for emitting blue light;
- CBL charge blocking layer
- EML2 second luminescent layer
- EML3 green light Light-emitting layer
- the LUMO levels of the first luminescent layer, the second luminescent layer, the third luminescent layer, and the charge blocking layer are all negative, and the LUMO level of the first luminescent layer is lower than the LUMO level of the second luminescent layer.
- the LUMO energy level of the second light-emitting layer is lower than the LUMO energy level of the third light-emitting layer, and the LUMO energy level of the third light-emitting layer is lower than the LUMO energy level of the charge-blocking layer; and the optical thickness of the first sub-pixel is The optical thickness T 2 of the second sub-pixel and the optical thickness ⁇ 3 of the third sub-pixel satisfy the following relationship:
- ⁇ 2 , ⁇ 3 represent wavelengths of the first color light, the second color light, and the third color light, respectively; ⁇ , ⁇ 2 , ⁇ 3 respectively represent the organic functional layer material of the sub-pixel in the first color light, Two colors The refractive index under the conditions of light and third color light.
- the OLED display panel may include: an anode layer; a hole transport layer on the anode layer; a first light-emitting layer covering the first sub-pixel and the second sub-pixel; and covering the second sub-pixel And a charge blocking layer of the third sub-pixel; a second light-emitting layer covering the first sub-pixel and the second sub-pixel; a third light-emitting layer covering the second sub-pixel and the third sub-pixel; and electron transport on the third light-emitting layer Layer; a transparent or translucent cathode layer on an electron transport layer.
- the transparent cathode layer can be made of a transparent conducting oxide (TCO), and the semi-transparent cathode layer can be made thin by a metal to achieve a semi-transmissive shape.
- TCO transparent conducting oxide
- electrons move from the cathode layer to the anode layer, and electrons easily transition from a light-emitting layer having a higher LUMO level to a light-emitting layer having a lower LUMO level, but are not easily removed from the LUMO level.
- the lower luminescent layer transitions to the luminescent layer with a higher LUMO level, and the electrons stay in a certain luminescent layer and recombine with the holes to form an exciton and emit light.
- the LUMO energy level of the EML3 is higher than the LUMO energy level of the EML2
- the LUMO energy level of the CBL is higher than the LUMO energy level of the EML2, so electrons are easily transmitted from the EML3 to the EML2, and are subjected to the CBL level.
- the electrons will be limited to EML2 to illuminate EML2 to emit red light, so that the second sub-pixel displays red light.
- the third sub-pixel region since the LUMO energy level of the EML3 is lower than the LUMO energy level of the CBL, electrons are not easily passed through the CBL, and the electrons are confined to the EML3 excitation EML3 to emit green light, so that the third sub-pixel displays green. Light.
- the OLED display panel can use a top emission structure, that is, a semi-transparent electrode for the top layer, which can ensure the emitted light, and its light color and efficiency are desired.
- a top emission structure that is, a semi-transparent electrode for the top layer, which can ensure the emitted light, and its light color and efficiency are desired.
- the optical behavior of OLEDs with top-emitting structures can be calculated based on wavefront optical standing wave conditions:
- ⁇ is the phase difference caused by the mirror; ⁇ is the ambient refractive index, indicating the same material, and different refractive indices are felt under different wavelengths of light; L is the cavity length (optical of each sub-pixel) Thickness); ⁇ is the angle; ⁇ is the wavelength; m is an integer.
- the first sub-pixel and the second sub-image of different colors are displayed.
- the optical thickness of the prime and the third sub-pixel are optimized for thickness, and the ratio of the length of the resonant cavity optimized for different light colors is the ratio of ⁇ / ⁇ , namely:
- ⁇ 1: ⁇ 2 : ⁇ 3 ( j / nj ) : ( ⁇ 2 / ⁇ 2 ): ( ⁇ 3 / ⁇ 3 ) ( II ) .
- the first sub-pixel displays blue
- the second sub-pixel displays red
- the third sub-pixel displays green
- the red R peak is 600 ⁇ 620nm
- the green light G peak is 520 ⁇ 530nm
- the blue light B peak is 450nm ⁇ 465nm.
- the refractive indices of the different wavelengths of light are different; in the case of the same material, the blue and green light have a refractive index greater than the red light.
- the optimized thickness design of the OLED display panel in this embodiment can be obtained as follows:
- the OLED display panel 4 the optical thickness of the first sub-pixel Tl, the second sub-pixel optical thickness ⁇ 2, the optical thickness of the third sub-pixel ⁇ 3, a first light emitting ⁇ ⁇ 1 film thickness of the layer, the film thickness of ⁇ ⁇ 2 second light emitting layer, the relationship between the film thickness also exists ⁇ ⁇ 3 a thickness T c and a charge blocking layer of the third light-emitting layer:
- T 2 -Ti T E3 +T C (V) ;
- ⁇ 2 - ⁇ 3 ⁇ ⁇ 1 + ⁇ ⁇ 2 (VI) .
- the top layer is made of a translucent electrode, the optical effect is very intense, which is called a microcavity effect, and the film thickness has a strong influence on the light color, and the above optimized thickness design can Ensure that there is no color mixing and color shift at a larger viewing angle.
- each functional layer of the conventional OLED device especially the device having the microcavity effect is particularly obvious
- the thickness needs to be independently adjusted according to the color requirement of each sub-pixel, and the OLED display panel of the top emission structure provided in this embodiment is provided.
- the thickness of a functional layer is related to and affects other functional layers and other sub-pixels, so the adjustment of the thickness of each functional layer is complicated.
- the thickness range of each functional layer is also provided in the embodiment, as described below.
- each functional layer is, for example:
- the thickness T E3 of the third luminescent layer ranges from: (OJTrTc) ⁇ T E3 ⁇ ( T Tc ) ; the thickness T c of the charge blocking layer ranges from: (3/13T 2 -T E3 ) ⁇ T c ⁇ (0.5T 2 -T E3 );
- the thickness T E2 range of the second light emitting layer is: (2 / 13T 2 - ⁇ ⁇ 1 ) ⁇ ⁇ 2 ⁇ (1/4 ⁇ 2 - ⁇ ⁇ 1); ⁇ ⁇ 1 thickness range of the first light-emitting layer: ( 2/11 ⁇ 3 - ⁇ ⁇ 2 ) ⁇ ⁇ 1 ⁇ ( 1/3 ⁇ 3 - ⁇ ⁇ 2 ).
- one FMM opening corresponds to one sub-pixel region, and the pixel density of the OLED display panel is limited due to the limited precision of the FMM.
- the first luminescent layer, the charge blocking layer, the second luminescent layer, and the third luminescent layer each cover at least two sub-pixels, such that when the luminescent layer is fabricated using FMM, the FMM
- the minimum opening can have at least two sub-pixel areas large, thereby enabling the pixel density of the OLED display panel to be doubled without changing the FMM.
- the OLED display panel of at least one embodiment of the present invention does not rely on optical effects to take out a certain color, and does not lose the luminous efficiency of the luminescent layer, and does not cause color shift problems.
- the OLED display panel of at least one embodiment of the present invention also does not need to change the order of arrangement of sub-pixels, and does not affect the screen display. Moreover, in at least one embodiment of the present invention, the thickness of the sub-pixels of different colors is optimized to further ensure that the color shift problem does not occur under a large viewing angle.
- the OLED display panel is not limited to the structure shown in FIG.
- the first illuminating layer may cover only the first sub-pixel and the second sub-pixel in addition to the entire pixel unit;
- the third illuminating layer may cover the entire sub-pixel and the third sub-pixel, a pixel unit;
- the second luminescent layer covers only the first sub-pixel and the second sub-pixel;
- the charge blocking layer covers only the second sub-pixel and the third sub-pixel.
- the first sub-pixel is not limited to displaying blue
- the second sub-pixel is not limited to displaying red
- the third sub-pixel is not limited to displaying green as long as the first sub-pixel, the second sub-pixel, and the third sub-pixel are displayed.
- Different colors and one of red, green and blue colors can be displayed.
- the colors displayed by the three sub-pixels are not limited to red, green, and blue, and may be, for example, white, yellow, or the like.
- an optimized thickness of each sub-pixel may be corresponding to the first luminescent layer, the second luminescent layer, and the third illuminating embodiment 2 according to the present invention.
- the pixel unit of the OLED display panel of the embodiment includes a first sub-pixel displaying a first color, a second sub-pixel displaying a second color, and a third sub-pixel displaying a third color, wherein the pixel of the OLED display panel
- the unit includes an anode layer, a cathode layer, and a layer disposed between the anode layer and the cathode layer
- the functional layer of the machine, the organic functional layer comprises the following layer structure:
- EML1 first luminescent layer
- CBL charge blocking layer
- EML2 second luminescent layer
- EML3 green light Light-emitting layer
- the HOMO levels of the first luminescent layer, the second luminescent layer, the third luminescent layer, and the charge blocking layer are all negative, and the HOMO level of the first luminescent layer is higher than the HOMO level of the second luminescent layer.
- the HOMO level of the second luminescent layer is higher than the HOMO level of the third luminescent layer
- the HOMO level of the third luminescent layer is higher than the HOMO level of the charge blocking layer
- the optical thickness T of the first sub-pixel 1 The optical thickness T 2 of the second sub-pixel and the optical thickness ⁇ 3 of the third sub-pixel satisfy the following relationship:
- ⁇ 2 , ⁇ 3 represent wavelengths of the first color light, the second color light, and the third color light, respectively;
- ⁇ , ⁇ 2 , ⁇ 3 are ambient refractive indices, respectively representing the organic functional layer material of the sub-pixel region The refractive index under the conditions of the first color light, the second color light, and the third color light.
- the OLED display panel may include: an anode layer; a hole transport layer on the anode layer; and a second sub-pixel and the first layer on the hole transport layer
- the transparent cathode layer can be made of a transparent conducting oxide (Transparent conducting oxide,
- the translucent cathode layer can be made of a thin metal to achieve a semi-transmissive shape.
- holes move from the anode layer to the cathode layer, and holes are easily transitioned from a light emitting layer having a lower HOMO level to a light emitting layer having a higher HOMO level, but are less likely to have a higher HOMO level.
- the light-emitting layer transitions to a light-emitting layer having a lower HOMO level, and when the hole stays in a certain light-emitting layer and meets the electron, the light-emitting layer is excited to emit light.
- the holes cannot pass through the CBL, so the holes will stay in the EML3 excitation EML3 to emit green light, thereby causing the third sub-pixel to be displayed. Green light.
- the OLED display panel can adopt a top emission structure, that is, the top layer can be used to ensure that the light is emitted, and the color and efficiency are desired.
- the optical behavior of OLEDs with top-emitting structures can be calculated based on wavefront optical standing wave conditions:
- the optical thicknesses of the first sub-pixel, the second sub-pixel, and the third sub-pixel of different colors are displayed for thickness optimization, and the ratio of the length of the resonant cavity optimized for different light colors is ⁇ / ⁇ ratio. , which is:
- ⁇ 1: ⁇ 2 : ⁇ 3 ( j / nj ) : ( ⁇ 2 / ⁇ 2 ): ( ⁇ 3 / ⁇ 3 ) ( II ) .
- the first sub-pixel displays blue
- the second sub-pixel displays red
- the third sub-pixel displays green
- the red R peak is 600 ⁇ 620nm
- the green light G peak is 520 ⁇ 530nm
- the blue light B peak is 450nm ⁇ 465nm.
- the refractive index of a typical material will have different responses for different wavelengths: blue light is about 1 to 1.5 times that of red light, and green light is about 1 to 1.3 times that of red light.
- the optimized thickness design of the OLED display panel in this embodiment can be obtained as follows:
- the light of the first sub-pixel Science thickness Tl, the second sub-pixel optical thickness ⁇ 2, the optical thickness of the third sub-pixel ⁇ 3, the film thickness of the first light-emitting layer ⁇ ⁇ 1 thickness of ⁇ ⁇ 2 second light emitting layer, the light emitting layer of the third film The following relationship exists between the thick tantalum ⁇ 3 and the film thickness T c of the charge blocking layer:
- T 2 -Ti T E3 +T C ( V ) ;
- T 2 -T 3 ⁇ ⁇ 1 + ⁇ ⁇ 2 ( VI ).
- the top layer is made of a translucent electrode, the optical effect is very intense, which is called a microcavity effect.
- the film thickness has a strong influence on the color of the light, and the optimized thickness design as described above can Ensure that there is no color mixing and color shift at a larger viewing angle.
- each functional layer of the conventional OLED device since the thickness of each functional layer of the conventional OLED device (especially the device having the microcavity effect is particularly obvious), it is necessary to independently adjust the thickness according to the color requirement of each sub-pixel, and the OLED display panel of the top emission structure provided by the embodiment,
- the thickness of each functional layer is related to and affects other functional layers and other sub-pixels, so the adjustment of the thickness of each functional layer is complicated.
- the thickness range of each functional layer is also provided in this embodiment, as described below.
- each functional layer is, for example:
- the thickness T E3 of the third luminescent layer ranges from: (OJTrTc ) ⁇ T E3 ⁇ ( T Tc ) ; the thickness T c of the charge blocking layer ranges from: (3/13 T 2 -T E3 ) ⁇ T c ⁇ (0.5T 2 - T E3) ; said thickness T E2 range of the second light emitting layer is: (2 / 13T 2 - ⁇ ⁇ 1 ) ⁇ ⁇ 2 ⁇ (1/4 ⁇ 2 - ⁇ ⁇ 1); the first The thickness of a light-emitting layer ⁇ ⁇ 1 ranges from: ( 2/11 ⁇ 3 - ⁇ ⁇ 2 ) ⁇ ⁇ ⁇ 1 ⁇ ( 1/3 ⁇ 3 - ⁇ ⁇ 2 ).
- the cathode is transparent or translucent.
- the optical thickness of the sub-pixel is the sub-pixel.
- the optical thickness of the first sub-pixel is the sum of the thickness of the organic functional layer of the first sub-pixel region and the thickness of the cathode layer, that is, the optical thickness ⁇ of the first sub-pixel is the thickness of the hole transport layer, The sum of the thickness of the first light-emitting layer, the thickness of the second light-emitting layer, the thickness of the electron transport layer, and the thickness of the cathode layer.
- the optical thickness ⁇ 2 of the second sub-pixel is the thickness of the hole transport layer, the thickness of the first luminescent layer, the thickness of the charge blocking layer, the thickness of the second luminescent layer, the thickness of the third luminescent layer, and the thickness of the electron transport layer.
- the optical thickness ⁇ 3 of the third sub-pixel is the sum of the thickness of the hole transport layer, the thickness of the charge blocking layer, the thickness of the third light-emitting layer, the thickness of the electron transport layer, and the thickness of the cathode layer.
- the first luminescent layer, the charge blocking layer, the second luminescent layer, and the third luminescent layer each cover at least two sub-pixels, such that when the luminescent layer is fabricated using the FMM, the FMM
- the minimum opening can have at least two sub-pixel areas large, thereby enabling the pixel density of the OLED display panel to be doubled without changing the FMM.
- the OLED display panel of at least one embodiment of the present invention does not rely on optical effects to take out a certain color, and does not lose the luminous efficiency of the luminescent layer, and does not cause color shift problems.
- the OLED display panel of at least one embodiment of the present invention also does not change the order of arrangement of sub-pixels, and does not affect the screen display. Moreover, in at least one embodiment of the present invention, the thickness of the sub-pixels of different colors in the OLED display panel is optimized to further ensure that the color mixing and color shift problems do not occur under a large viewing angle.
- the OLED display panel of at least one embodiment of the present invention is not limited to the structure shown in FIG. 6.
- the first illuminating layer may cover only the first sub-pixel and the a second sub-pixel; the third illuminating layer may cover the entire pixel unit in addition to the second sub-pixel and the third sub-pixel; the second illuminating layer covers only the first sub-pixel and the second sub-pixel; the charge blocking layer only covers The second sub-pixel and the third sub-pixel.
- the first sub-pixel is not limited to displaying blue
- the second sub-pixel is not limited to displaying red
- the third sub-pixel is not limited to displaying green as long as the first sub-pixel, the second sub-pixel, and the third sub-pixel are displayed. Different colors and one of red, green and blue colors can be displayed.
- an optimized thickness of each sub-pixel may be according to a specific structure of the first luminescent layer, the second luminescent layer, the third luminescent layer, and the charge blocking layer. Combined with the above formula I, ⁇ calculated.
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CN103779387B (zh) | 2014-01-06 | 2018-11-02 | 京东方科技集团股份有限公司 | Oled显示面板及显示装置 |
CN104659067B (zh) * | 2015-02-06 | 2018-12-18 | 京东方科技集团股份有限公司 | 一种显示基板及其制备方法和一种显示设备 |
CN104617130A (zh) * | 2015-02-06 | 2015-05-13 | 京东方科技集团股份有限公司 | 一种oled像素单元、oled显示面板及显示装置 |
CN104733506B (zh) | 2015-04-01 | 2017-10-24 | 京东方科技集团股份有限公司 | 一种电致发光显示器件及显示装置 |
CN107464825A (zh) * | 2016-06-03 | 2017-12-12 | 上海和辉光电有限公司 | 一种oled显示面板及其制备方法 |
JP6637601B2 (ja) * | 2016-07-28 | 2020-01-29 | シャープ株式会社 | 表示装置の製造方法および表示装置 |
US10461132B2 (en) * | 2016-09-30 | 2019-10-29 | Sharp Kabushiki Kaisha | Display apparatus and method for manufacturing same |
CN107994125B (zh) * | 2017-11-29 | 2019-10-22 | 京东方科技集团股份有限公司 | 显示背板及其制作方法、显示装置 |
CN110634933B (zh) * | 2019-09-29 | 2023-10-20 | 合肥京东方卓印科技有限公司 | 一种oled显示面板、显示装置及制备方法 |
CN113785409B (zh) * | 2020-04-09 | 2024-04-26 | 京东方科技集团股份有限公司 | Oled显示基板及显示装置 |
CN111785744A (zh) * | 2020-08-27 | 2020-10-16 | 京东方科技集团股份有限公司 | 一种oled显示面板及其制备方法、显示装置 |
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