WO2012133458A1 - 表示用基板、有機エレクトロルミネッセンス表示装置、およびそれらの製造方法 - Google Patents
表示用基板、有機エレクトロルミネッセンス表示装置、およびそれらの製造方法 Download PDFInfo
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- WO2012133458A1 WO2012133458A1 PCT/JP2012/058009 JP2012058009W WO2012133458A1 WO 2012133458 A1 WO2012133458 A1 WO 2012133458A1 JP 2012058009 W JP2012058009 W JP 2012058009W WO 2012133458 A1 WO2012133458 A1 WO 2012133458A1
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- light emitting
- sub
- emitting layer
- pixel
- light
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Images
Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- 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
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
- H05B33/14—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of the electroluminescent material, or by the simultaneous addition of the electroluminescent material in or onto the light source
- H05B33/145—Arrangements of the electroluminescent material
-
- 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
- H10K59/351—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels comprising more than three subpixels, e.g. red-green-blue-white [RGBW]
-
- 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
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
-
- H—ELECTRICITY
- 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
-
- 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
- H10K59/12—Active-matrix OLED [AMOLED] 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
- H10K59/875—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
- the present invention relates to a vapor deposition technique for forming a vapor deposition film having a predetermined pattern on a display substrate. More specifically, the present invention relates to a display substrate, an organic electroluminescence display device using such a vapor deposition technique, and methods for producing the same. It is about.
- flat panel displays have been used in various products and fields, and further flat panel displays are required to have larger sizes, higher image quality, and lower power consumption.
- an organic EL display device including an organic EL element using electroluminescence (electroluminescence; hereinafter referred to as “EL”) of an organic material is an all-solid-state type, driven at a low voltage and has a high-speed response.
- EL electroluminescence
- the organic EL display device has, for example, a configuration in which an organic EL element connected to a TFT is provided on a substrate made of a glass substrate or the like provided with a TFT (thin film transistor).
- the organic EL element is a light-emitting element that can emit light with high luminance by low-voltage direct current drive, and has a structure in which a first electrode, an organic EL layer, and a second electrode are stacked in this order. Of these, the first electrode is connected to the TFT.
- the organic EL layer a hole injection layer, a hole transport layer, an electron blocking layer, a light emitting layer, a hole blocking layer, an electron transport layer, an electron injection layer
- a hole injection layer a hole injection layer, a hole transport layer, an electron blocking layer, a light emitting layer, a hole blocking layer, an electron transport layer, an electron injection layer
- FIG. 19 is a diagram schematically showing a sub-pixel arrangement in each pixel of a general full-color organic EL display device.
- a full-color organic EL display device generally has a TFT substrate with an organic EL element having a light emitting layer of each color of R (red), G (green), and B (blue) as a sub-pixel.
- An image is displayed by selectively emitting light from these organic EL elements with a desired luminance using TFTs.
- At least a light emitting layer made of an organic light emitting material that emits light of each color is patterned for each organic EL element that is a light emitting element (see, for example, Patent Documents 1 and 2).
- the organic EL element is formed by stacking organic films, but the light emitting layer needs to be separately deposited for each sub-pixel of each color.
- an organic film is separately formed by a vapor deposition method using a vapor deposition mask.
- the vacuum deposition method includes a method of forming a film by bringing the deposition target substrate and a deposition mask into close contact with each other, and a scan deposition method of forming a film by separating the deposition target substrate and the deposition mask. Broadly divided.
- the deposition substrate and the vapor deposition source are arranged to face each other, and the vapor deposition region is attached to the mask so that the vapor deposition particles do not adhere to the region other than the target vapor deposition region.
- An opening corresponding to a part of the pattern is provided, and pattern formation is performed by depositing vapor deposition particles on the substrate through the opening.
- the misalignment of the vapor deposition film occurs as described above, when the misalignment of the vapor deposition film exceeds the allowable range, as shown in FIG. 20, a region of one sub pixel is formed among adjacent sub pixels.
- the vapor deposition film to be penetrated into the area of the other subpixel, and the vapor deposition film pattern is also formed on the light emitting area of the adjacent subpixel.
- the vapor deposition film to be formed in the region of the G subpixel among the adjacent G and B subpixels enters the region of the B subpixel, and the vapor deposition film pattern of the light emitting layer (G) is In the example shown, the light emitting region is also formed on the light emitting region of the adjacent B sub-pixel.
- the color of the other sub-pixel and the one sub-pixel are affected by the color of the one sub-pixel in the region of the other sub-pixel that is invaded.
- the so-called color mixing phenomenon occurs.
- the color mixture causes a decrease in display quality and a yield of the organic EL display device.
- the non-light emitting area between the sub-pixels may be widened. However, the area of the light emitting area of the sub-pixel is reduced.
- the current density supplied to obtain the same light emission luminance is increased, so that the deterioration of luminance with time is accelerated. That is, the lifetime is shortened.
- the granularity of the displayed image increases. That is, the pattern does not look homogeneous and is visually recognized as an aggregate of grains.
- the present invention has been made in view of the above problems, and a display substrate and an organic electroluminescence display capable of suppressing a decrease in display quality due to a misalignment of a deposited film without enlarging a non-light-emitting region. It is an object of the present invention to provide an apparatus and a manufacturing method thereof.
- a display substrate has a plurality of pixel regions each including at least three light-emitting regions each having a light-emitting layer made of a vapor deposition film as sub-pixel regions.
- the light emitting areas are the light emitting area of the light emitting layer having the maximum current efficiency and the light emitting area of the color light emitting layer having the minimum current efficiency when light of the same luminance is generated in the light emitting layers of the light emitting areas of the respective colors. It is characterized by being a light emitting region of a combination other than the combination.
- the light emitting region of the color light emitting layer having the maximum current efficiency and the minimum current Since the light emitting region has a combination other than the light emitting region of the light emitting layer having the efficiency, the light emitting region of the color light emitting layer having the maximum current efficiency and the light emitting region of the color light emitting layer having the minimum current efficiency
- the difference in current efficiency between the two adjacent light emitting regions can be reduced.
- the display substrate has the above-described configuration, in the manufacturing process, the vapor deposition film in one of the two light emitting regions adjacent to the vapor deposition film in the other light emitting region is changed. Even if it intrudes, the degree of color mixing (degree of color change) due to the intrusion can be suppressed as compared with the conventional configuration.
- the display substrate according to the present invention is provided with at least three rows of vapor deposition film patterns having different film thicknesses in the same plane, and the two adjacent vapor deposition film patterns are the maximum. It is characterized by being a vapor deposition film pattern of a combination other than a combination of a vapor deposition film pattern having a thickness of 1 and a vapor deposition film pattern having a minimum film thickness.
- At least three rows of vapor deposition film patterns with different film thicknesses are provided in the same plane, and two adjacent vapor deposition film patterns are deposited with the vapor deposition film pattern having the maximum film thickness and the vapor deposition film having the minimum film thickness. Since it was set as the vapor deposition film pattern of combinations other than the combination with a film pattern, compared with the structure where the vapor deposition film pattern with the maximum film thickness and the vapor deposition film pattern with the minimum film thickness are adjacent to each other, two adjacent vapor depositions The difference in film thickness between the film patterns can be reduced.
- the organic electroluminescence display device includes any one of the display substrates according to the present invention.
- a display substrate manufacturing method includes a plurality of pixel regions each including at least three light-emitting regions each having a light-emitting layer made of a vapor deposition film as sub-pixel regions.
- the degree of color mixture (degree of color change) due to the intrusion is suppressed most.
- the deterioration of image quality can be most suppressed.
- the method for producing an organic electroluminescence display device includes an anode forming step for forming an anode and a cathode forming step for forming a cathode, and a deposition film is formed between the anode forming step and the cathode forming step.
- the light emitting layer has a property that light emission is likely to occur in a region close to the anode, in other words, the light emission luminance increases as it is closer to the anode.
- the light emitting layer forming process when light of the same luminance is generated in the light emitting layers of the light emitting regions of the respective colors, the light emitting layer having a color with lower current efficiency is formed in the order closer to the anode forming process. By doing so, even if color mixing occurs, the influence can be reduced.
- the light-emitting layer on the intrusion side When the light-emitting layer on the intrusion side is closer to the anode, the light-emitting layer on the intrusion side tends to emit light. In this case, the current efficiency of the light-emitting layer on the anode side is higher than the current efficiency of the other light-emitting layer. Since it is low, the effect is offset (cancelled).
- the display substrate according to the present invention has a plurality of pixel regions each including at least three color light-emitting regions each having a light-emitting layer made of a vapor deposition film as sub-pixel regions, and two adjacent light-emitting regions are The combination of the light emitting layer of the color light emitting layer having the maximum current efficiency and the light emitting region of the color light emitting layer having the minimum current efficiency when light of the same luminance is generated in the light emitting layer of the light emitting region of each color
- the light emitting region is a combination other than the above.
- the display substrate manufacturing method is a method for manufacturing a display substrate having a plurality of pixel regions each including a light emitting region of at least three colors each having a light emitting layer made of a vapor deposition film as a sub pixel region.
- the current efficiency is the highest between the light emitting layer having the highest current efficiency and the light emitting layer having the lowest current efficiency when light having the same luminance is generated in the light emitting layers of the light emitting regions of the respective colors. It is characterized in that at least one color light emitting layer having a current efficiency of a magnitude between the current efficiency of the color light emitting layer and the current efficiency of the color light emitting layer having the smallest current efficiency is formed.
- the degree of color mixing (the degree of color change) can be suppressed as compared with the conventional configuration.
- the display substrate according to the present invention is provided with at least three rows of vapor deposition film patterns having different film thicknesses in the same plane, and the two adjacent vapor deposition film patterns have the maximum film thickness. And a vapor deposition film pattern other than the combination of the vapor deposition film pattern having the minimum film thickness.
- the organic electroluminescence display device includes any one of the display substrates described above.
- the manufacturing method of the organic electroluminescence display device includes an anode forming step for forming an anode and a cathode forming step for forming a cathode, and vapor deposition is performed between the anode forming step and the cathode forming step.
- the light emitting layer having a smaller current efficiency is formed in the order closer to the anode forming step.
- FIG. 2 is a diagram schematically showing an arrangement of subpixels constituting each pixel in the organic EL display device according to the first embodiment of the present invention as an arrangement of subpixel regions in one pixel region of a TFT substrate in the organic EL display device.
- FIG. 3 is a cross-sectional view taken along line AA of the TFT substrate in the organic EL display device shown in FIG. It is sectional drawing which shows the structural example of the organic electroluminescent display apparatus concerning Embodiment 1 of this invention. It is a figure which shows the circuit structure of the sub pixel drive circuit which drives each sub pixel.
- FIG. 1 It is a perspective view which shows schematic structure of the principal part of the vapor deposition apparatus used in Embodiment 1 of this invention. It is a flowchart which shows the manufacturing process of the organic electroluminescence display concerning Embodiment 1 of this invention in process order. It is a flowchart which shows an example of the method of forming a predetermined pattern in a TFT substrate using the vapor deposition apparatus shown in FIG. (A) to (h) schematically illustrate a pattern in which the light-emitting layer of one sub-pixel of two adjacent sub-pixels enters the light-emitting region of the other sub-pixel using the configuration of the main part of the TFT substrate.
- FIG. 4 is a cross-sectional view showing a configuration example of the organic EL display device 1 according to the present embodiment.
- the organic EL display device 1 shown in FIG. 4 includes a TFT substrate 10, an organic EL element 20, an adhesive layer 30, and a sealing substrate 40, and is a bottom emission type that extracts light from the TFT substrate 10 side. This is a full-color display type display device.
- the TFT substrate 10 is provided with a TFT or the like as a switching element in a portion serving as a pixel region.
- the organic EL elements 20 are formed in a matrix in the display area of the TFT substrate 10.
- the TFT substrate 10 on which the organic EL element 20 is formed is bonded to the sealing substrate 40 with an adhesive layer 30 or the like.
- FIG. 1 schematically shows an arrangement of subpixels constituting each pixel in the organic EL display device 1 according to the present embodiment as an arrangement of subpixel regions in one pixel region of the TFT substrate 10 in the organic EL display device 1.
- FIG. 1 schematically shows an arrangement of subpixels constituting each pixel in the organic EL display device 1 according to the present embodiment as an arrangement of subpixel regions in one pixel region of the TFT substrate 10 in the organic EL display device 1.
- one pixel region of the TFT substrate 10 means a pixel of the minimum structural unit for performing color display when the display panel is formed (that is, when the organic EL display device 1 is assembled) (this embodiment) In the embodiment, an area corresponding to three primary color pixels) is shown.
- the sub pixel area of the TFT substrate 10 refers to each sub pixel that constitutes one pixel that is a minimum structural unit for performing color display when the display panel is formed (that is, when the organic EL display device 1 is assembled). An area corresponding to a pixel (dot) is shown.
- FIG. 2 is a plan view showing the configuration of the pixels constituting the organic EL display device 1.
- FIG. 3 is a cross-sectional view taken along line AA of the TFT substrate 10 in the organic EL display device 1 shown in FIG.
- FIG. 1 corresponds to a diagram in which the cross section taken along the line AA of the TFT substrate 10 shown in FIG. 3 is focused on the arrangement of sub-pixels.
- the TFT substrate 10 has a configuration in which a TFT 12 (switching element), an interlayer insulating film 13, a wiring 14, an edge cover 15 and the like are formed on a transparent insulating substrate 11 such as a glass substrate. ing.
- the organic EL display device 1 is a full-color active matrix organic EL display device. As shown in FIG. 2 and FIG. 3, on the insulating substrate 11, red (R), green (G), and blue (B) organic EL elements 20 are respectively formed in regions surrounded by the wirings 14. The sub-pixels 2R (1), 2G, 2R (2), and 2B of the respective colors are arranged in a matrix.
- the area surrounded by the wiring 14 is one sub-pixel (dot), and R, G, and B light-emitting areas (light-emitting portions) are defined for each sub-pixel.
- Pixel 2 (that is, one pixel) includes red sub-pixels 2R (1) and 2R (2) that emit red light, green sub-pixel 2G that emits green light, and blue sub-pixel that emits blue light.
- the sub-pixel 2B includes four sub-pixels 2R (1), 2G, 2R (2), and 2B.
- Each of the sub-pixels 2R (1), 2G, 2R (2), and 2B has a stripe-shaped color as a light-emitting area of each color responsible for light emission in each of the sub-pixels 2R (1), 2G, 2R (2), and 2B. Exposed portions 15R (1), 15G, 15R (2), and 15B covered with the light emitting layers 23R (1), 23G, 2R (2), and 23B are provided.
- the light emitting layers 23R (1), 23G, 23R (2), and 23B are patterned by vapor deposition for each color.
- the sub-pixels 2R (1), 2G, 2R (2), and 2B are provided with TFTs 12 connected to the first electrode 21 in the organic EL element 20, respectively.
- the emission intensity of each of the sub-pixels 2R (1), 2G, 2R (2), and 2B is determined by scanning and selection by the wiring 14 and the TFT 12.
- the organic EL display device 1 realizes image display by selectively causing the organic EL element 20 to emit light with desired luminance using the TFT 12.
- the interlayer insulating film 13 is laminated over the entire area of the insulating substrate 11 on the insulating substrate 11 so as to cover each TFT 12 and the wiring 14.
- the first electrode 21 in the organic EL element 20 is formed on the interlayer insulating film 13.
- the interlayer insulating film 13 is provided with a contact hole 13 a for electrically connecting the first electrode 21 in the organic EL element 20 to the TFT 12. Thereby, the TFT 12 is electrically connected to the organic EL element 20 through the contact hole 13a.
- the edge cover 15 prevents the first electrode 21 and the second electrode 26 in the organic EL element 20 from being short-circuited when the organic EL layer becomes thin or the electric field concentration occurs at the end of the first electrode 21.
- This is an insulating layer.
- the edge cover 15 is formed on the interlayer insulating film 13 so as to cover the end of the first electrode 21.
- the first electrodes 21 of the sub-pixels 2R (1), 2G, 2R (2), and 2B are exposed at portions where the edge cover 15 is not provided, as shown in FIG.
- the exposed portions 15R (1), 15G, 15R (2), and 15B become the light emitting regions (light emitting portions) of the sub-pixels 2R (1), 2G, 2R (2), and 2B as described above.
- the sub-pixels 2R (1), 2G, 2R (2), and 2B are partitioned by the edge cover 15 having an insulating property.
- the edge cover 15 also functions as an element isolation film.
- each of the sub-pixels 2R (1), 2G, 2R (2), and 2B has light emitting regions (light emitting portions) in the exposed portions 15R (1), 15G, 15R (2), and 15B, respectively. And non-light emitting regions 15r (1), 15g, 15r (2), and 15b (non-light emitting portions) between the exposed portions 15R (1), 15G, 15R (2), and 15B.
- the light emission regions of the respective colors in the exposed portions 15R (1), 15G, 15R (2), and 15B on the TFT substrate 10 are sub-pixels 2R (1), 2G, and 2R (2) of the organic EL display device 1. ).
- 2B is included as a sub-pixel region (that is, a part of the sub-pixel region).
- the organic EL element 20 is a light emitting element that can emit light with high luminance by low-voltage direct current drive, and the first electrode 21, the organic EL layer, and the second electrode 26 are stacked in this order. .
- the first electrode 21 is a layer having a function of injecting (supplying) holes into the organic EL layer. As described above, the first electrode 21 is connected to the TFT 12 through the contact hole 13a.
- a hole injection layer / hole transport layer 22 and a light emitting layer 23R (1) -23G * 23R (2) * 23B, the electron carrying layer 24, and the electron injection layer 25 have the structure formed in this order.
- a carrier blocking layer for blocking the flow of carriers such as holes and electrons may be inserted as necessary.
- One layer may have a plurality of functions. For example, one layer serving as both a hole injection layer and a hole transport layer may be formed.
- the stacking order is that in which the first electrode 21 is an anode and the second electrode 26 is a cathode.
- the stacking order of the organic EL layers is reversed.
- the hole injection layer is a layer having a function of increasing the efficiency of hole injection from the first electrode 21 to the organic EL layer.
- the hole transport layer is a layer having a function of increasing the hole transport efficiency to the light emitting layers 23R (1), 23G, 23R (2), and 23B.
- the hole injection layer / hole transport layer 22 is uniformly formed on the entire display region of the TFT substrate 10 so as to cover the first electrode 21 and the edge cover 15.
- the hole injection layer / hole transport layer 22 in which the hole injection layer and the hole transport layer are integrated is provided as the hole injection layer and the hole transport layer. ing.
- this embodiment is not limited to this, and the hole injection layer and the hole transport layer may be formed as independent layers.
- the light emitting layers 23R (1), 23G, 23R (2), and 23B correspond to the sub-pixels 2R (1), 2G, 2R (2), and 2B, respectively. Is formed.
- the light emitting layers 23R (1), 23G, 23R (2), and 23B have a function of emitting light by recombining holes injected from the first electrode 21 side and electrons injected from the second electrode 26 side. It is a layer which has.
- the light emitting layers 23R (1), 23G, 23R (2), and 23B are each formed of a material with high current efficiency, such as a low-molecular fluorescent dye or a metal complex.
- the current efficiency is a ratio of luminance emitted when a current of a certain value flows per unit area, and the unit is represented by cd / A.
- the current efficiency of the light emitting layer 23G is the highest.
- the current efficiency of the light emitting layer 23R (1) and the light emitting layer 23R (2) is high, and the current efficiency of the light emitting layer 23B is the lowest.
- the electron transport layer 24 is a layer having a function of increasing the electron transport efficiency from the second electrode 26 to the light emitting layers 23R (1), 23G, 23R (2), and 23B.
- the electron injection layer 25 is a layer having a function of increasing the electron injection efficiency from the second electrode 26 to the organic EL layer.
- the electron transport layer 24 covers the light emitting layers 23R (1), 23G, 23R (2), and the hole injection / hole transport layer 22 so as to cover the light emitting layers 23R (1), 23G, 23R (2), and 23B. On the 23B and the hole injection / hole transport layer 22, it is uniformly formed over the entire display area of the TFT substrate 10.
- the electron injection layer 25 is uniformly formed on the entire surface of the display region of the TFT substrate 10 on the electron transport layer 24 so as to cover the electron transport layer 24.
- the electron transport layer 24 and the electron injection layer 25 may be formed as independent layers as described above, or may be provided integrally with each other. That is, the organic EL display device 1 may include an electron transport layer / electron injection layer instead of the electron transport layer 24 and the electron injection layer 25.
- the second electrode 26 is a layer having a function of injecting electrons into the organic EL layer composed of the organic layers as described above.
- the second electrode 26 is uniformly formed on the electron injection layer 25 over the entire display area of the TFT substrate 10 so as to cover the electron injection layer 25.
- the organic layers other than the light emitting layers 23R (1), 23G, 23R (2), and 23B are not essential layers as the organic EL layer, and may be appropriately formed according to the required characteristics of the organic EL element 20.
- one layer may have a plurality of functions.
- a carrier blocking layer can be added to the organic EL layer as necessary. For example, by adding a hole blocking layer as a carrier blocking layer between the light emitting layers 23R (1), 23G, 23R (2), and 23B and the electron transport layer 24, holes escape to the electron transport layer 24. And the luminous efficiency of each color can be improved.
- layers other than the first electrode 21 (anode), the second electrode 26 (cathode), and the light emitting layers 23R (1), 23G, 23R (2), and 23B may be appropriately inserted.
- one pixel constituting the organic EL display device 1 is arranged in an arrangement pattern of red (R), green (G), and blue (B).
- subpixels 2R (1) and 2R (2) including a light emitting layer having current efficiency between the light emitting layer 23G and the light emitting layer 23B are arranged.
- the arrangement of the sub-pixels in one pixel 2 is red (R), green (G), red (R), and blue (B).
- the R subpixel adjacent to the G subpixel in the conventional configuration and the R subpixel newly disposed between the G subpixel and the B subpixel in the present embodiment are arranged.
- the former R sub-pixel is referred to as a sub-pixel 2R (1)
- the latter R sub-pixel is referred to as a sub-pixel 2R (2).
- subpixel driving circuits including TFTs 12 are provided corresponding to the subpixels 2R (1), 2G, 2R (2), and 2B, respectively.
- FIG. 5 is a diagram showing a circuit configuration of a sub-pixel driving circuit that drives each sub-pixel.
- the sub-pixel drive circuit includes a control transistor Tr1, a drive transistor Tr2, and a capacitor C.
- the source terminal of the transistor Tr1 is connected to the source line 14S.
- the gate terminal of the transistor Tr1 is connected to the gate line 14G.
- the drain terminal of the transistor Tr1 is connected to the gate terminal of the transistor Tr2.
- the drain terminal of the transistor Tr2 is connected to the power supply wiring 14V.
- the source terminal of the transistor Tr2 is connected to the organic EL element 20.
- the capacitor C is installed between the drain terminal of the transistor Tr2 and the gate terminal of the transistor Tr2.
- the capacitor C is a voltage holding capacitor.
- the transistor Tr1 is turned on when the gate line 14G becomes H (high) during data writing. As a result, the data voltage signal from the source line 14S is written to the capacitor C. Subsequently, when the gate line 14G becomes L (low), the transistor Tr1 is turned off. Thereby, the capacitor C and the source line 14S are cut off, and the capacitor C holds the data voltage signal written at the time of data writing.
- the current of the transistor Tr2 is determined by the magnitude of the voltage across the capacitor C. Therefore, a current corresponding to the data voltage signal is supplied to the organic EL element.
- each sub-pixel drive circuit is not limited to the above.
- a circuit for compensating for variations in characteristics of the transistors Tr1 and Tr2 and aging may be added. Accordingly, wiring other than the gate line 14G, the source line 14S, and the power supply wiring 14V may be provided.
- FIG. 6 is a perspective view showing a schematic configuration of a main part of the vapor deposition apparatus 150 used in the present embodiment.
- the vapor deposition apparatus 150 includes a mask unit 500 disposed in the vacuum chamber 600.
- the mask unit 500 includes a vapor deposition mask 102 (vapor deposition mask), a vapor deposition source 103, and a limiting plate 300 disposed between the mask 102 and the vapor deposition source 103.
- a vapor deposition mask 102 vapor deposition mask
- a vapor deposition source 103 vapor deposition source
- a limiting plate 300 disposed between the mask 102 and the vapor deposition source 103.
- the mask 102, the vapor deposition source 103, and the limiting plate 300 are integrally formed using a holding member such as the same holder, for example, and their relative positions are fixed.
- the vapor deposition source 103 is disposed opposite to the mask 102 and the limiting plate 300 with a certain gap (that is, spaced apart by a certain distance).
- the vapor deposition source 103 generates gaseous vapor deposition particles by heating and vaporizing the vapor deposition material (when the vapor deposition material is a liquid material) or sublimating (when the vapor deposition material is a solid material).
- the vapor deposition source 103 has an injection port 103a (through port) for injecting vapor deposition particles on the surface facing the limiting plate 300 and the mask 102, and the vaporized vapor deposition material is injected from the injection port 103a as vapor deposition particles.
- FIG. 6 shows an example in which the vapor deposition source 103 has a plurality of injection ports 103a, but the number of the injection ports 103a is not particularly limited, and at least one is formed. It only has to be done.
- injection ports 103a may be arranged in a one-dimensional shape (that is, a line shape) as shown in FIG. 6, or may be arranged in a two-dimensional shape (that is, a planar shape (tile shape)). Absent.
- the vapor deposition source 103 may have a configuration including a heating container called a crucible that directly accommodates the vapor deposition material.
- the vapor deposition source 103 includes a load lock type pipe (not shown) and a vapor deposition particle supply source (not shown) connected to the pipe, and an injection port 103a is provided.
- the vapor deposition particles may be ejected from the injection port 103a by supplying the vapor deposition particles to the nozzle portion.
- An opening 102a (through hole) is formed in the mask 102 at a desired position and shape, and only the vapor deposition particles that have passed through the opening 102a of the mask 102 reach the deposition target substrate 200 to form a vapor deposition film.
- an organic film having a desired film formation pattern is vapor-deposited and formed only at a desired position of the film formation substrate 200 corresponding to the opening 102a.
- FIG. 6 as an example, a case where a plurality of strip-like (stripe-like, slit-like) openings 102 a extending in a direction parallel to the scanning direction is provided in the mask 102 is provided. Shown with illustrations.
- the sub-pixels 2R (1) and 2G are used as the mask 102.
- an open mask having an opening on the entire display area is used.
- Examples of forming film formation patterns on the sub-pixels 2R (1), 2G, 2R (2), and 2B include, for example, the light emitting layers 23R (1), 23G, 23R (2), and 23B.
- the deposition is performed for each color of the light emitting layers 23R (1), 23G, 23R (2), and 23B (that is, for each of R, G, and B) (this is referred to as “separate deposition”).
- the opening 102a is formed when the light emitting layers 23R (1), 23G, 23R (2), and 23B are separately formed on the TFT substrate 10 as the pattern of the vapor deposition film on the deposition target substrate 200.
- (1), 23G, 23R (2), and 23B are formed according to the same color row size and pitch.
- a fine mask in which only a region where a red light emitting material is deposited is opened. Is used as a vapor deposition mask 102 to form a film.
- Examples of forming a deposited film pattern on the entire display area include a hole injection layer / hole transport layer 22 (or hole injection layer, hole transport layer), an electron transport layer 24, an electron injection layer 25, and the like. .
- film formation is performed by using as an evaporation mask 102 an open mask in which only the entire display area and an area where film formation is necessary are opened. The same applies to the second electrode 26.
- the mask 102 is not necessarily required.
- the restriction plate 300 has a plurality of openings 301 (through holes) penetrating in the vertical direction.
- the vapor deposition particles injected from the injection port 103a of the vapor deposition source 103 reach the deposition target substrate 200 through the opening 301 of the limiting plate 300 and the opening 102a of the mask 102.
- the vapor deposition particles ejected from the ejection port 103a of the vapor deposition source 103 are ejected radially with a certain extent.
- the angle of the vapor deposition particles incident on the deposition target substrate 200 is limited to a certain angle or less.
- the limiting plate 300 is not heated or cooled by a heat exchanger (not shown) in order to cut the vapor deposition particles having an oblique component. For this reason, the limiting plate 300 is at a lower temperature than the injection port 103 a of the vapor deposition source 103.
- a shutter (not shown) between the limiting plate 300 and the vapor deposition source 103.
- the position of the restriction plate 300 in the direction perpendicular to the film formation surface 200 a of the film formation substrate 200 is provided between the mask 102 and the vapor deposition source 103 so that the restriction plate 300 is separated from the vapor deposition source 103.
- the limiting plate 300 may be provided in close contact with the mask 102.
- the width of the long side of the limiting plate 300 is formed to be approximately the same as the width of the long side of the mask 102, for example, and the width of the short side of the limiting plate 300 is the same as the width of the short side of the mask 102, for example. It is formed to a size of about.
- the limiting plate 300 is provided between the mask 102 and the vapor deposition source 103 is illustrated as an example, but the limiting plate 300 is not necessarily required.
- the deposition source 103 is arranged below the deposition target substrate 200, and the deposition target substrate 200 is deposited from the deposition source 103 with the deposition target surface 200 a facing downward.
- An example in which particles are ejected upward and deposited (updeposition) on the deposition target substrate 200 is shown as an example.
- the vapor deposition method is not limited to this, and the vapor deposition source 103 is provided above the deposition target substrate 200, and vapor deposition particles are ejected downward from the deposition source 103 to the deposition target substrate 200. Vapor deposition (downdeposition) may be performed.
- the vapor deposition source 103 has, for example, a mechanism for injecting vapor deposition particles in the lateral direction, and the film formation surface 200a side of the film formation substrate 200 is set up in the vertical direction facing the vapor deposition source 103 side. In this state, the vapor deposition particles may be ejected in the lateral direction and vapor deposited (side deposition) on the deposition target substrate 200.
- FIG. 7 is a flowchart showing manufacturing steps of the organic EL display device 1 in the order of steps.
- the manufacturing method of the organic EL display device 1 includes, for example, a TFT substrate / first electrode manufacturing step (S1), a hole injection layer / hole transport layer deposition configuration (S2). ), A light emitting layer vapor deposition step (S3), an electron transport layer vapor deposition step (S4), an electron injection layer vapor deposition step (S5), a second electrode vapor deposition step (S6), and a sealing step (S7).
- the stacking order described in the present embodiment is such that the first electrode 21 is an anode and the second electrode 26 is a cathode, and conversely, the first electrode 21 is a cathode and the second electrode 26 is a cathode. Is used as the anode, the stacking order of the organic EL layers is reversed. Similarly, the materials constituting the first electrode 21 and the second electrode 26 are also reversed.
- a photosensitive resin is applied on an insulating substrate 11 such as glass on which TFTs 12 and wirings 14 are formed by a known technique, and patterning is performed by a photolithography technique, thereby insulating substrate 11.
- An interlayer insulating film 13 is formed thereon.
- the insulating substrate 11 has a thickness of 0.7 to 1.1 mm, a length in the y-axis direction (vertical length) of 400 to 500 mm, and a length in the x-axis direction (horizontal length) of 300 to 300 mm.
- a 400 mm glass substrate or a plastic substrate is used. In this embodiment, a glass substrate is used.
- an acrylic resin or a polyimide resin can be used as the interlayer insulating film 13.
- the acrylic resin include Optomer series manufactured by JSR Corporation.
- a polyimide resin the photo nice series by Toray Industries, Inc. is mentioned, for example.
- the polyimide resin is generally not transparent but colored. For this reason, as shown in FIG. 3, when a bottom emission type organic EL display device is manufactured as the organic EL display device 1, a transparent resin such as an acrylic resin is more preferably used as the interlayer insulating film 13. Used.
- the film thickness of the interlayer insulating film 13 is not particularly limited as long as the step due to the TFT 12 can be compensated. In this embodiment, for example, the thickness is about 2 ⁇ m.
- a contact hole 13 a for electrically connecting the first electrode 21 to the TFT 12 is formed in the interlayer insulating film 13.
- an ITO (Indium Tin Oxide: Indium Tin Oxide) film is formed with a thickness of 100 nm by a sputtering method or the like.
- the ITO film is etched using ferric chloride as an etchant. Thereafter, the photoresist is stripped using a resist stripping solution, and substrate cleaning is further performed. Thereby, the first electrode 21 is formed in a matrix on the interlayer insulating film 13.
- Examples of the conductive film material used for the first electrode 21 include transparent conductive materials such as ITO, IZO (Indium (Zinc Oxide), gallium-doped zinc oxide (GZO), gold (Au), nickel, and the like.
- a metal material such as (Ni) or platinum (Pt) can be used.
- a method for laminating the conductive film in addition to the sputtering method, a vacuum deposition method, a CVD (chemical vapor deposition) method, a plasma CVD method, a printing method, or the like can be used.
- the thickness of the first electrode 21 is not particularly limited, but as described above, for example, the thickness can be 100 nm.
- the edge cover 15 is formed by patterning with a film thickness of about 1 ⁇ m, for example.
- the same insulating material as that of the interlayer insulating film 13 can be used.
- the TFT substrate 10 and the first electrode 21 are produced (S1).
- the TFT substrate 10 that has undergone the above-described steps is subjected to oxygen plasma treatment as a vacuum baking for dehydration and surface cleaning of the first electrode 21.
- a hole injection layer and a hole transport layer are formed on the TFT substrate 10 over the entire display area of the TFT substrate 10. (S2).
- an open mask having an entire display area opened is aligned and adhered to the TFT substrate 10 and then scattered from the deposition source while rotating the TFT substrate 10 and the open mask together. Vapor deposition particles are uniformly deposited on the entire display region through the opening of the open mask.
- vapor deposition on the entire surface of the display area means that vapor deposition is performed continuously between adjacent sub-pixels of different colors.
- the hole injection layer and the hole transport layer may be integrated as described above, or may be formed as independent layers.
- Each film thickness is, for example, 10 to 100 nm.
- Examples of the material of the hole injection layer, the hole transport layer, or the hole injection layer / hole transport layer 22 include anthracene, azatriphenylene, fluorenone, hydrazone, stilbene, triphenylene, benzine, styrylamine, triphenylamine, and porphyrin. , Triazole, imidazole, oxadiazole, oxazole, polyarylalkane, phenylenediamine, arylamine, and derivatives thereof, thiophene compounds, polysilane compounds, vinylcarbazole compounds, aniline compounds, etc. Examples thereof include conjugated monomers, oligomers, and polymers.
- the hole injection layer / hole transport layer 22 is provided as the hole injection layer and the hole transport layer, and the material of the hole injection layer / hole transport layer 22 is 4,4′-bis [ N- (1-naphthyl) -N-phenylamino] biphenyl ( ⁇ -NPD) was used.
- the film thickness of the hole injection layer / hole transport layer 22 was 30 nm.
- the subpixels 2R (1), 2G, and 2R are covered on the hole injection layer / hole transport layer 22 so as to cover the exposed portions 15R (1), 15G, 15R (2), and 15B of the edge cover 15.
- the light emitting layers 23R (1), 23G, 23R (2), and 23B are separately formed (patterned) corresponding to (2) and 2B (S3).
- the light emitting layers 23R (1), 23G, 23R (2), and 23B are made of a material having high current efficiency such as a low-molecular fluorescent dye or a metal complex.
- a material having high current efficiency such as a low-molecular fluorescent dye or a metal complex.
- the film thickness of the light emitting layers 23R (1), 23G, 23R (2), and 23B is, for example, 10 to 100 nm.
- the electron transport layer 24 is formed into the hole injection layer / hole transport layer 22 and the light emitting layer 23R (1) / 23G. Evaporation is performed on the entire display area of the TFT substrate 10 so as to cover 23R (2) and 23B (S4).
- the electron injection layer 25 is formed on the entire surface of the display region of the TFT substrate 10 so as to cover the electron transport layer 24 by the same method as the hole injection layer / hole transport layer deposition step (S2). Evaporation is performed (S5).
- Examples of the material for the electron transport layer 24 and the electron injection layer 25 include tris (8-quinolinolato) aluminum complex, oxadiazole derivative, triazole derivative, phenylquinoxaline derivative, silole derivative and the like.
- Alq tris (8-hydroxyquinoline) aluminum
- anthracene naphthalene
- phenanthrene pyrene
- anthracene perylene
- butadiene coumarin
- acridine stilbene
- 1,10-phenanthroline and derivatives and metal complexes thereof
- the electron transport layer 24 and the electron injection layer 25 may be integrated or formed as independent layers.
- Each film thickness is, for example, 1 to 100 nm.
- the total film thickness of the electron transport layer 24 and the electron injection layer 25 is, for example, 20 to 200 nm.
- Alq is used as the material of the electron transport layer 24, and LiF is used as the material of the electron injection layer 25.
- the thickness of the electron transport layer 24 was 30 nm, and the thickness of the electron injection layer 25 was 1 nm.
- the second electrode 26 is applied to the entire display region of the TFT substrate 10 so as to cover the electron injection layer 25 by the same method as the hole injection layer / hole transport layer deposition step (S2). Evaporation is performed (S6).
- Electrode material of the second electrode 26 a metal having a small work function is preferably used.
- examples of such electrode materials include magnesium alloys (MgAg, etc.), aluminum alloys (AlLi, AlCa, AlMg, etc.), metallic calcium, and the like.
- the thickness of the second electrode 26 is, for example, 50 to 100 nm.
- the organic EL element 20 including the organic EL layer, the first electrode 21, and the second electrode 26 was formed on the TFT substrate 10.
- the TFT substrate 10 on which the organic EL element 20 was formed and the sealing substrate 40 were bonded together with the adhesive layer 30, and the organic EL element 20 was sealed.
- sealing substrate 40 for example, an insulating substrate such as a glass substrate or a plastic substrate having a thickness of 0.4 to 1.1 mm is used. In this embodiment, a glass substrate is used.
- the vertical length and the horizontal length of the sealing substrate 40 may be appropriately adjusted according to the size of the target organic EL display device 1, and an insulating substrate having substantially the same size as the insulating substrate 11 in the TFT substrate 10 is used. After sealing the organic EL element 20, the organic EL element 20 may be divided according to the size of the target organic EL display device 1.
- sealing method of the organic EL element 20 it is not limited to an above-described method.
- Other sealing methods include, for example, a method in which engraved glass is used as the sealing substrate 40 and sealing is performed in a frame shape with a sealing resin, frit glass, or the like, or between the TFT substrate 10 and the sealing substrate 40.
- a method of filling a resin in between The manufacturing method of the organic EL display device 1 does not depend on the sealing method, and any sealing method can be applied.
- a protective film (not shown) that prevents oxygen and moisture from entering the organic EL element 20 from the outside may be provided on the second electrode 26 so as to cover the second electrode 26. .
- the protective film is made of an insulating or conductive material. Examples of such a material include silicon nitride and silicon oxide. Further, the thickness of the protective film is, for example, 100 to 1000 nm.
- the organic EL display device 1 is completed through the above steps.
- the organic EL layer starts from the first electrode 21. Holes are injected into. On the other hand, electrons are injected from the second electrode 26 into the organic EL layer, and holes and electrons are recombined in the light emitting layers 23R (1), 23G, 23R (2), and 23B. When recombined holes and electrons deactivate energy, they are emitted as light.
- a predetermined image is displayed by controlling the light emission luminance of each of the sub-pixels 2R (1), 2G, 2R (2), and 2B.
- FIG. 8 is a flowchart showing an example of a method for forming a predetermined pattern on the film formation substrate 200 using the TFT substrate 10 as the film formation substrate 200 using the vapor deposition apparatus 150 shown in FIG. .
- the deposition source 103, the mask 102 (fine mask), the limiting plate 300, and the deposition target substrate 200 are put into the vacuum chamber 600, respectively. Then, alignment of the film formation substrate 200 is performed (S11).
- a holder such as a mask holder and alignment markers can be used for alignment, and the order is not particularly limited.
- the mask 102 and the limiting plate 300 are respectively installed (fixed) on the vapor deposition source 103 such that the limiting plate 300 is positioned between the vapor deposition source 103 and the mask 102.
- the mask 102, the limiting plate 300, and the vapor deposition source 103 are used, for example, as the mask unit 500 so that their relative positions are fixed.
- the mask unit 500 and the film formation substrate 200 are respectively held by a mask unit holding member, a film formation substrate holding member, etc. (not shown).
- the vapor deposition source 103 and the mask 102 maintain a constant distance between the vapor deposition source 103 and the mask 102, and at the same time, stripe-shaped openings formed in the substrate scanning direction and the mask 102. Positioning is performed so that the major axis direction of the portion 102a coincides.
- the deposition target substrate 200 is aligned so that the direction of the same color sub-pixel row of the deposition target substrate 200 coincides with the substrate scanning direction, and a gap between the deposition target substrate 200 and the mask 102.
- the gap is adjusted so that (substrate-mask gap) becomes constant.
- the material of the blue light emitting layer 23B is deposited on the TFT substrate 10 which is the film formation substrate 200 (S12).
- the substrate is scanned so that the deposition target substrate 200 passes over the mask 102.
- the light-emitting layer 23B includes 3-phenyl-4 (1′-naphthyl) -5-phenyl-1,2,4-triazole (TAZ) (host material) and 2- (4′-t-butyl) as its material. Phenyl) -5- (4 ′′ -biphenylyl) -1,3,4-oxadiazole (t-Bu PBD) (blue light emitting dopant), and the deposition rate was 5.0 nm / s, These materials (blue organic material) were formed by co-evaporation at 0.67 nm / s.
- the blue organic material vapor-deposited particles emitted from the vapor deposition source 103 are vapor-deposited at a position facing the opening 102a of the mask 102 through the opening 102a of the mask 102 when the deposition target substrate 200 passes over the mask 102. Is done.
- a stripe-shaped vapor deposition film is formed on the deposition target substrate 200 from one end to the other end in the moving direction.
- the fine mask in which the opening part 102a was formed according to the pattern of the vapor deposition film formed into a film-forming substrate 200 was used for the mask 102 at this time. That is, here, a fine mask having an opening 102a at a position corresponding to the light emitting layer 23B is used.
- the film thickness of the light emitting layer can be adjusted by reciprocating scanning (that is, reciprocating movement of the deposition target substrate 200) and scanning speed.
- the scanning direction of the deposition target substrate 200 is reversed, and a method similar to the deposition in the previous one direction is performed. Then, the blue organic material was further evaporated on the deposited film made of the blue organic material formed by the evaporation in one direction. Thereby, the light emitting layer 23B with a film thickness of 50 nm was formed.
- the deposition target substrate 200 on which the light emitting layer 23B was formed was taken out from the vacuum chamber 600 (S13).
- the light emitting layer 23B is formed on the deposition target substrate 200 on which the light emitting layer 23B is formed.
- red light emitting layers 23R (1) and 23R (2) were formed.
- a fine mask having openings 102a at positions corresponding to the light emitting layers 23R (1) and 23R (2) was prepared as the mask 102. .
- the mask 102 is placed in the vacuum chamber 600 for forming the light emitting layers 23R (1) and 23R (2), and the openings 102a of the mask 102 are arranged in the sub-pixels 2R (1) and 2R (2). It aligned so that it might correspond and vapor deposition was performed.
- the light emitting layers 23R (1) and 23R (2) are made of TAZ (host material) and bis (2- (2′-benzo [4,5- ⁇ ] thienyl) pyridinato-N, C3 ′) iridium. (Acetylacetonate) (btp2Ir (acac)) (red light emitting dopant) is used, and these materials (red organic materials) are co-evaporated at a deposition rate of 5.0 nm / s and 0.53 nm / s, respectively. Was formed.
- the film thickness of the light emitting layers 23R (1) and 23R (2) was 50 nm, respectively.
- the deposition target substrate 200 on which the light emitting layers 23R (1) and 23R (2) were formed was taken out from the vacuum chamber 600.
- the light emitting layers 23R (1) and 23R (2) are used.
- a green light emitting layer 23G was formed in the same manner as the film forming process of 23R (2).
- a fine mask having an opening 102a at a position corresponding to the light emitting layer 23G was prepared as the mask 102.
- the mask 102 was placed in each vacuum chamber 600 for forming the light emitting layer 23G, and the deposition was performed by aligning the openings 102a of the mask 102 so as to coincide with the sub-pixel 2G columns.
- the light emitting layer 23G uses (TAZ) (host material) and Ir (ppy) 3 (green light emitting dopant) as materials, and the deposition rate is 5.0 nm / s and 0.67 nm / s, respectively. These materials (green organic material) were formed by co-evaporation.
- the film thickness of the light emitting layer 23G was 50 nm.
- a red (R) sub-pixel is always placed between a green (G) sub-pixel column and a blue (B) sub-pixel column. Pixel columns are arranged.
- the sub-pixels of each color have different current efficiencies as described above, and are generally larger in the order of G, R, and B (G is the highest).
- the sub-pixel (P2) It is influenced by the color of the light emitting layer of the pixel (P1). That is, so-called color mixing occurs in which the colors of the adjacent sub-pixels (P1) and (P2) are mixed.
- the effect of color mixing depends on the difference in current efficiency between the light emitting layers of the mixed colors.
- the emitted light intensity (light intensity) Strength) increases.
- the ratio of the light emitting layer of the sub-pixel (P1) entering the sub-pixel (P2) is k.
- k is equal to the area ratio of the region (superimposed region) where the light emitting layer overlaps in the sub pixel (P2) to the light emitting region of the sub pixel (P2).
- the ratio of the total film thickness increasing due to the superimposition of the light emitting layer in the sub-pixel (P2) to increase the electrical resistance is N times.
- the sub-pixel (P2) in the case where color mixture occurs The total resistance of the light emitting layer can be regarded as a parallel circuit of a resistance having a resistance value “Rx / (1-k)” and a resistance having a resistance value “N ⁇ Rx / k”.
- ⁇ be the ratio at which the current flowing in the overlapping region contributes to the light emission in the light emitting region in the sub-pixel (P2).
- the current corresponding to the ratio ⁇ is converted into the output light of the color of the sub-pixel (P2) that should originally emit light.
- the current corresponding to the ratio (1- ⁇ ) is converted into the output light of the color of the sub-pixel (P1) adjacent to the sub-pixel (P2).
- the sub-pixel (P2) when the current efficiency of the light emitting layer of the sub-pixel (P2) is ⁇ and the current efficiency of the light-emitting layer of the adjacent sub-pixel (P1) entering the sub-pixel (P2) is ⁇ x, the sub-pixel (P2)
- the emission luminance E of the emission color and the emission luminance Ex of the emission color of the adjacent sub-pixel (P1) are expressed by (Expression 3) and (Expression 4), respectively.
- the subpixel (P2) has an original light emission luminance of 91 /.
- the color of the sub-pixel (P1) appears mixed by the amount of 1/92 ⁇ ⁇ x ⁇ i.
- current efficiency indicates current efficiency when light of the same luminance is generated in the light emitting layer of each color light emitting region unless otherwise specified.
- the G subpixel has a current efficiency (cd / A) That is, the emission luminance per unit current is very large.
- the G sub-pixel has higher emission luminance (strongly shines) than the B sub-pixel.
- the G subpixel is compared with the B subpixel. Since the light emission is strong, a color greatly different from B is output in the color mixture generation region. As a result, the color mixture appears clearly.
- a sub-pixel 2R (2) is disposed between the sub-pixel 2G and the sub-pixel 2B that are adjacent to each other in the conventional configuration, as shown in FIGS.
- the sub-pixels of each color are arranged in a one-dimensional manner in the order of sub-pixel 2R (1) / sub-pixel 2G / sub-pixel 2R (2) / sub-pixel 2B.
- the sub-pixels are arranged in the order of red (R) / green (G) / red (R) / blue (B) in the row direction.
- the light-emitting layer of one sub-pixel (P1) among the two adjacent sub-pixels (P1) and (P2) is the other sub-pixel. Even if the light enters the light emitting region of the pixel (P2), it is possible to suppress the deterioration of the image quality due to the displacement of the light emitting layer as compared with the conventional case.
- FIG. 9A to 9H show the light emitting layer of one of the adjacent sub-pixels among the sub-pixels 2R (1), 2G, 2R (2), and 2B in the pixel 2 of the organic EL display device 1.
- FIG. FIG. 4 is a diagram schematically showing a pattern that enters the light emitting region of the other sub-pixel using the configuration of the main part of the TFT substrate 10.
- positional deviation occurs in the light emitting layers of the respective colors, and the light emitting layer in one of the two adjacent subpixels is in the other subpixel. Assume a situation where the light emitting area has been entered.
- Pattern (1) As shown in FIG. 9A, the light emitting layer 23R (1) of the sub pixel 2R (1) is formed in the light emitting region of the sub pixel 2R (1) in the exposed portion 15R (1). A pattern in which the light emitting layer 23G of the sub-pixel 2G enters later.
- Pattern (2) As shown in FIG. 9B, the light emitting layer 23R (1) of the sub pixel 2R (1) is formed in the light emitting region of the sub pixel 2R (1) in the exposed portion 15R (1). Before the light emitting layer 23G of the sub-pixel 2G enters.
- Pattern (3) As shown in FIG. 9C, before the light emitting layer 23G of the subpixel 2G is formed in the light emitting region of the subpixel 2G in the exposed portion 15G, the light emission of the subpixel 2R (1) A pattern into which the layer 23R (1) enters.
- Pattern (4) As shown in FIG. 9D, after the light emitting layer 23B of the subpixel 2B is formed in the light emitting region of the subpixel 2G in the exposed portion 15G, the light emitting layer 23R of the subpixel 2R (2) is formed. Pattern that (2) invades.
- Pattern (5) As shown in FIG. 9E, after the light emitting layer 23B of the subpixel 2B is formed in the light emitting region of the subpixel 2B in the exposed portion 15B, the light emitting layer 23R of the subpixel 2R (2) is formed. Pattern that (2) invades.
- Pattern (6) As shown in FIG. 9F, before the light emitting layer 23G of the subpixel 2G is formed in the light emitting region of the subpixel 2B in the exposed portion 15B, the light emission of the subpixel 2R (2) Pattern in which the layer 23R (2) enters.
- Pattern (7) As shown in FIG. 9G, the light emitting layer 23R (2) of the sub pixel 2R (2) is formed in the light emitting region of the sub pixel 2R (2) in the exposed portion 15R (1). A pattern in which the light emitting layer 23B of the sub-pixel 2B enters before performing.
- Pattern (8) As shown in FIG. 9H, the light emitting layer 23R (2) of the sub pixel 2R (2) is formed in the light emitting region of the sub pixel 2R (2) in the exposed portion 15R (2). A pattern in which the light emitting layer 23B of the sub-pixel 2B enters later.
- the difference in current efficiency between the light emitting layer 23R (1) and the light emitting layer 23G is smaller than the difference in current efficiency between the light emitting layer 23B and the light emitting layer 23G.
- the light emitting layer 23R (1) has higher current efficiency than the light emitting layer 23B, and the required current is higher. small.
- the emission brightness of G light is also small. Accordingly, the influence of the color mixture is smaller than when the light emitting layer 23G of the subpixel 2G enters the light emitting region of the subpixel 2B.
- the pattern (2) shown in FIG. 9B is the same as the pattern (1).
- the difference in current efficiency between the light emitting layer 23R (1) and the light emitting layer 23G is smaller than the difference in current efficiency between the light emitting layer 23B and the light emitting layer 23G.
- the light emitting layer 2R (1) has higher current efficiency than the light emitting layer 23B, and the required current is higher. small.
- the influence of color mixing is greater when the light emitting layer 23R (1) enters than when the light emitting layer 23B of the subpixel 2B enters the light emitting region of the subpixel 2G.
- the current efficiency of the light emitting layer 23G is the maximum, the current required for the light emitting layer 23G is the smallest. If the current is small, the emission brightness of the R light is also small.
- the pattern (4) shown in FIG. 9D is the same as the pattern (3).
- the difference in current efficiency between the light emitting layer 23R (2) and the light emitting layer 23B is smaller than the difference in current efficiency between the light emitting layer 23G and the light emitting layer 23B.
- the current efficiency of the light emitting layer 23R (2) is smaller than the current efficiency of the light emitting layer 23G.
- the influence of the color mixture is smaller than when the light emitting layer 23G of the subpixel 2G enters the light emitting region of the subpixel 2B.
- the pattern (6) shown in (f) of FIG. 9 is the same as the pattern (5).
- the difference in current efficiency between the light emitting layer 23B and the light emitting layer 23R (2) is smaller than the difference in current efficiency between the light emitting layer 23G and the light emitting layer 23R (2).
- the current efficiency of the light emitting layer 23B is smaller than the current efficiency of the light emitting layer 23G.
- the influence of the color mixture is smaller than when the light emitting layer 23G of the subpixel 2G enters the light emitting region of the subpixel 2R (2).
- the pattern (8) shown in (h) of FIG. 9 is the same as the pattern (7).
- the influence of the color mixture can be made smaller than the pattern in which the light emitting layer having the maximum current efficiency enters the light emitting region.
- the light emitting layer having the highest current efficiency and the light emitting layer having the lowest current efficiency when the same luminance is generated in the light emitting layers of a plurality of colors, the light emitting layer having the highest current efficiency and the light emitting layer having the lowest current efficiency. In between, there is always a color light emitting layer having a current efficiency in the middle of both current efficiencies.
- the influence of the color mixture can be reduced compared to the case where the G light and the B light are mixed. Therefore, it is possible to suppress the image quality deterioration due to this.
- the present embodiment it is possible to reduce the influence of the above-described color mixture without enlarging the non-light emitting area between the sub-pixels. As a result, the reliability and display quality of the organic EL display device 1 can be improved.
- the pixel of the minimum structural unit for performing color display is composed of three sub-pixels composed of the three primary colors of RGB, and the arrangement of the sub-pixels of each color in one pixel
- the arrangement order of the emission colors of the light emitting layers in each sub-pixel region in one pixel region of the TFT substrate 10 is R / G / R / B.
- the arrangement may be appropriately arranged based on the permutation of current efficiency, and the arrangement of the light emission colors is not limited to the arrangement.
- FIG. 10 is a diagram schematically illustrating an example in which pixels including N (N is an integer of 3 or more) types of sub-pixels having different current efficiency of the deposited film are arranged in a one-dimensional direction (that is, one direction). It is.
- two adjacent subpixels include a subpixel having a light emitting layer (evaporated film) of a color having the maximum current efficiency and a subpixel having a light emitting layer (evaporated film) of a color having the minimum current efficiency.
- the subpixels are combinations other than the combination.
- the numbers from “1” to “N” are assigned to the sub-pixels of each color in order from the one with the highest current efficiency of the light emitting layer.
- a subpixel having a vapor deposition film having the maximum current efficiency and a subpixel having a vapor deposition film having the minimum current efficiency are adjacent to each other.
- a sub-pixel having a light-emitting layer having a color having the maximum current efficiency (a sub-pixel “1” in FIG. 10) and a light-emitting layer having a color having the minimum current efficiency are provided.
- Sub-pixels (sub-pixels other than the sub-pixels having the light emitting layer of the color having the maximum or minimum current efficiency) are arranged. That is, subpixels are arranged in the order of (N ⁇ 1), (N ⁇ 2),..., 2, 1, 2,.
- the degree of color mixture (color The degree of change) can be suppressed as compared with the conventional configuration.
- the current efficiency of the G light emitting layer is the highest and the current efficiency of the B light emitting layer is the lowest.
- the light-emitting layer is formed of a material having high current efficiency such as a fluorescent dye such as a low-molecular fluorescent dye or a metal complex, and a material such as a host material or a light-emitting dopant is appropriately changed and combined. This changes the current efficiency.
- the sub-pixel arrangement is changed to [B] / [G] / [B] / [R].
- the light emitting layer order may be used.
- the notation [R], [G], and [B] used as the order indicating the magnitude of current efficiency or the order of arrangement are R light emitting layer, G light emitting layer, B The color light emitting layer is shown in a simplified manner. The same notation is used in the following description and embodiments described later.
- the number of colors of sub-pixels in one pixel is not limited to three colors as shown in FIG. At this time, the difference in current efficiency between the light emitting layers in adjacent subpixels may be minimized.
- subpixels adjacent to a certain subpixel may be selected from light emitting layers that are adjacent in a current efficiency permutation. For example, a case where one pixel is formed by sub-pixels of four colors obtained by adding Y (yellow) to the above R, G, and B can be considered.
- the Y-color light-emitting layer is abbreviated as [Y] as in [R], [G], and [B].
- the current efficiency of each light emitting layer in the sub-pixels of R, G, B, and Y decreases in the color order of [G] ⁇ [Y] ⁇ [R] ⁇ [B] (that is, Current efficiency of the G light emitting layer> current efficiency of the Y light emitting layer> current efficiency of the R light emitting layer> current efficiency of the B light emitting layer), the arrangement of sub-pixels of each color is [R] / The light emitting layer order is [Y] / [G] / [Y] / [R] / [B], and this [R] / [Y] / [G] / [Y] / [R] / [B] Six sub-pixels may be a minimum constituent unit (one unit) constituting one pixel.
- the sub pixels adjacent to the Y sub pixel are the R sub pixel (R sub pixel) and the G sub pixel (G sub pixel).
- the sub-pixel is adjacent to the Y sub-pixel in order of current efficiency.
- the light emitting regions of the light emitting layers of the respective colors are arranged in a one-dimensional direction, and the subpixels are arranged so that the difference in current efficiency between the light emitting layers in adjacent light emitting regions is minimized.
- one pixel when one pixel is composed of M sub-pixels, one pixel can be formed by a minimum of (M ⁇ 1) ⁇ 2 sub-pixels.
- one sub-pixel having a light emitting layer having the maximum and minimum current efficiency is provided.
- two subpixels each including a light emitting layer having other current efficiency are provided.
- the present embodiment is not limited to this. That is, the sub-pixels 2R (1) and 2R (2) may be driven individually by providing the TFTs 12 in the sub-pixels 2R (1) and 2R (2) as described above. 2R (1) ⁇ 2R (2) may be simultaneously driven by one TFT 12.
- FIG. 11 is a diagram schematically illustrating an example of the sub-pixel arrangement according to the present embodiment.
- FIG. 11 shows an example of the arrangement of sub-pixels in the case where one pixel 2 is composed of three-color sub-pixels.
- the solid line indicates a sub-pixel that constitutes one pixel 2 (indicated by a one-dot chain line in FIG. 11), and the sub-pixel that constitutes a part of the pixel near the pixel 2 is indicated by a broken line. Show.
- the arrangement mode of sub-pixels constituting one pixel is different from that in the first embodiment.
- the sub-pixels constituting one pixel are arranged in a one-dimensional direction.
- each pixel 2 that is, each color sub-pixel constituting one pixel, is arranged in a two-dimensional direction, that is, in a two-dimensional shape (matrix shape, tile shape). Arranged).
- FIG. 12 is a diagram schematically showing an example of a vapor deposition method used in the present embodiment.
- a deposition mask 303 is closely fixed to the deposition target substrate 200 as a method of patterning a deposition film on each sub-pixel.
- the method of vapor deposition is used.
- the deposition target substrate 200 and the vapor deposition source 302 are arranged to face each other, and an opening corresponding to a desired vapor deposition film pattern is formed in the mask 303 so that vapor deposition particles do not adhere to a region other than the target vapor deposition region.
- a unit 304 is provided. Thus, pattern formation is performed by depositing vapor deposition particles on the deposition target substrate 200 through the opening 304.
- the deposition target substrate 200 is disposed in a vacuum chamber (not shown), and a deposition source 302 is disposed below the deposition target substrate 200.
- the mask 303 is used in close contact with the deposition target substrate 200.
- a mask 303 having a size equal to or larger than that of the deposition target substrate 200 is used as the mask 303.
- a mask 303 smaller than the deposition target substrate 200 and disposing an adhesion-preventing plate in a non-evaporation region where vapor deposition is not required vapor deposition particles scattered outside the mask 303 can be prevented from adhering to the deposition plate (shielding plate). ) Or the like.
- the vapor deposition source 302 may be fixed, or may be movable during the vapor deposition operation.
- a belt-like line-type evaporation source such as the evaporation source 103 shown in FIG. 6 is used as the evaporation source 302, and the evaporation source 302 and the deposition target substrate 200 are relative to each other. You may vapor-deposit, moving to.
- a planar evaporation source having a size equivalent to that of the deposition target substrate 200 may be used as the deposition source 302, and vapor deposition may be performed on the entire deposition target surface of the deposition target substrate 200.
- the deposition target substrate 200 and the mask 303 may be configured to integrally move such as rotation.
- the above-described vapor deposition method is used, and the vapor deposition film is formed with a vapor deposition film pattern different from that in the first embodiment as shown in FIG.
- the organic EL display device 1 was manufactured in the process.
- one pixel is configured by two-dimensionally arranging a plurality of sub-pixels.
- the sub-pixel arrangement of one pixel in this embodiment is in the order of [R] / [G] / [R] / [B] as in the first embodiment.
- it is arranged in a tile shape (that is, a two-dimensional array).
- [R] is always arranged on the four sides of [G] and the four sides of [B].
- vapor deposition is performed while scanning using a vapor deposition mask 102 smaller than the deposition target substrate 200 as used in the first embodiment. It is not possible to use the scanning vapor deposition method.
- the mask 303 is brought into close contact with the film formation substrate 200 for vapor deposition.
- the R light emitting layer (light emitting layers 23R (1) and 23R (2) is formed. ) And G light emitting layer (light emitting layer 23G) in this order.
- the G subpixel and the B subpixel are not adjacent to each other in both the row direction and the column direction.
- the separation distance D between the G subpixel and the B subpixel is a pixel pitch in an oblique direction.
- the G sub-pixel (sub-pixel 2G) and the B sub-pixel (sub-pixel 2B) are arranged only in a one-dimensional direction across the R sub-pixel (sub-pixel 2R (2)).
- the G sub-pixel and the B sub-pixel were separated by “the width of the R light emitting region + the width of the non-light emitting region”.
- the G light emitting layer 23G and the B light emitting region are expressed as “R light emitting region width 15R (2) + non-light emitting region 15r (2) width ⁇ 2 + It was separated by “the width of the non-light emitting region 15b”.
- the B light-emitting layer 23B and the G light-emitting region are expressed as “R light-emitting region width 15R (2) + non-light-emitting region 15r (2) width ⁇ 2 + non-light-emitting region 15g”. The width of ".
- the G light emission region and the B light emission region are expressed as “R light emission region width 15R (2) + non-light emission region 15g width + non-light emission region 15r (2) width ⁇ 2+ width of non-light emitting region 15b ”.
- the G light-emitting layer 23G having the maximum current efficiency enters the light-emitting region of the light-emitting layer 23B having the minimum current efficiency, which is adjacent in the oblique direction.
- the margin becomes smaller.
- the margin between the G sub-pixel and the B sub-pixel is “the width of the non-light-emitting region”. ⁇ ⁇ 2 ”.
- the separation distance between the G light emitting layer 23G and the B light emitting region is separated by “width of the non-light emitting region 15b ⁇ ⁇ 2”, and the B light emitting layer 23B and the G light emitting region are separated from each other. Is separated by “width of non-light emitting region 15 g ⁇ ⁇ 2”.
- the margin is improved as compared with the conventional structure in which the G subpixel and the B subpixel are adjacent in the column direction.
- the present embodiment has an advantage that the display definition of the R pixel is doubled in the vertical direction (row direction) as compared with the first embodiment.
- the light emitting layer pattern of the G light emitting layer emits light. There is no intrusion into the region, and the deposited film pattern of the B light emitting layer does not enter the light emitting region of the G light emitting layer.
- the sub pixel having the G light emitting layer having the maximum current efficiency and the minimum current efficiency are obtained.
- R sub-pixels having layers are arranged.
- the sub pixel having the G light emitting layer having the maximum current efficiency and the sub pixel having the B light emitting layer having the minimum current efficiency are disposed between the G subpixel and the B subpixel. More preferably, sub-pixels are arranged.
- the light-emitting layer of one sub-pixel in the G sub-pixel and the B sub-pixel is the light-emitting region of the other sub-pixel. Does not enter or is unlikely.
- the R sub-pixel is not adjacent to the G sub-pixel in the oblique direction. There is no need to arrange sub-pixels.
- the G sub-pixel and the B sub-pixel are prevented so that the G sub-pixel and the B sub-pixel are not adjacent to each other.
- a light-emitting layer or sub-pixel having the shape shown in FIG. 13B may be formed.
- FIG. 13 are diagrams showing an enlargement of a separation distance between sub-pixels adjacent in an oblique direction by changing the shape of the light-emitting layer or the light-emitting layer and the light-emitting region.
- FIG. 13A shows a separation distance D between subpixels adjacent in the oblique direction before the separation distance is enlarged
- FIG. 13B shows subpixels neighboring in the oblique direction after the separation distance is enlarged.
- the distance D ′ between them (D ⁇ D ′) is shown.
- At least one of the light-emitting layer and the light-emitting region in the sub-pixels adjacent to each other in an oblique direction is formed in an octagonal shape, as shown in FIG.
- the separation distance between two sub-pixels adjacent in the oblique direction (more strictly speaking, the separation distance between the light-emitting regions of two light-emitting layers adjacent in the oblique direction) can be increased.
- the organic EL display device 1 having excellent display quality, or the TFT substrate 10 that is a display substrate for providing such an organic EL display device 1.
- ⁇ Modification of sub-pixel arrangement> the case where one pixel is configured by three primary color sub-pixels has been described as an example. However, the present embodiment is not limited to this. That is, the number of colors of sub-pixels in one pixel is not limited to three colors, and may be four or more colors.
- FIG. 14 is a diagram illustrating an arrangement example of sub-pixels in the case where one pixel 2 is configured by four-color sub-pixels.
- the solid line indicates a sub-pixel constituting one pixel 2 (indicated by a one-dot chain line in FIG. 14), and the sub-pixel constituting a part of the pixel in the vicinity of the pixel 2 is indicated by a broken line. Show.
- the light emitting layers of the sub-pixels of each color are [S1] to [S4], and the current efficiency of the light-emitting layer in the sub-pixels of each color is in the order of [S1], [S2], [S3], [S4]. It shall be high ([S1] is the maximum).
- the arrangement pattern of the sub-pixels shown in FIG. 14 is two in the column direction (horizontal direction in FIG. 14), and four sub-pixels are arranged in each column, that is, in the row direction (vertical direction in FIG. 14) in each column. Yes.
- [S1], [S2], and [S3] are arranged in the order of [S1] ⁇ [S2] ⁇ [S3] ⁇ [S2] from above.
- [S2], [S3], and [S4] are arranged in the order [S2] ⁇ [S3] ⁇ [S4] ⁇ [S3] from above.
- the subpixels of the light emitting layer having the maximum current efficiency and the subpixels of the light emitting layer having the minimum current efficiency are not adjacent to each other.
- the following points are taken into consideration in addition to the fact that one pixel is configured with as few subpixels as possible.
- the current efficiency difference between the light emitting layers in two adjacent sub-pixels may be minimized.
- the order of the light emitting layer and the current efficiency in the subpixels of the target color is arranged at a position adjacent to the target sub-pixel.
- [S2] having the next highest current efficiency after [S1] is arranged around [S1]
- [S2] has a large current efficiency around [S2].
- [S1] and [S3] are placed close to each other, and [S2] and [S4] are placed around [S3], and the current efficiency is close to that of [S3].
- [S3] is arranged next to [S4], which has the lowest current efficiency.
- one sub-pixel having a light-emitting layer having the maximum and minimum current efficiency and one sub-pixel having a light-emitting layer having an intermediate current efficiency are provided for each pixel.
- the light emitting layers of the sub-pixels adjacent in both the row direction and the column direction are adjacent in the order of current efficiency. That is, the difference in current efficiency between the light emitting layers in adjacent subpixels is minimized. Thereby, the influence of color mixing can be reduced most.
- FIG. 15 shows an arrangement example of sub-pixels in the case where one pixel is configured by M types of sub-pixels so as to satisfy the three conditions of making the difference in current efficiency minimum (condition 3).
- FIG. 15 shows an example in which ⁇ (M ⁇ 2) ⁇ 2 ⁇ rows are arranged in the row direction (vertical direction in FIG. 15), and two columns of sub-pixels are arranged in the column direction (lateral direction in FIG. 15). .
- the light emitting layers of the sub-pixels of each color are set to [S1] to [Sm] (m ⁇ 3), and the current efficiency is set to [S1], [S2], ..., [Sm-1], [Sm] is the permutation ([S1] is the maximum), and attention is paid to the two subpixel columns extending in the row direction.
- the left subpixel column is the first column and the right subpixel column is the second column.
- one subpixel having a light emitting layer with the maximum and minimum current efficiency is provided for each pixel.
- Two sub-pixels each having a light-emitting layer with current efficiency other than the maximum and minimum are provided.
- the pixels satisfying the above conditions 1 to 3 are formed by at least (M ⁇ 2) ⁇ 4 (pieces) (M ⁇ 3) sub-pixels. Is done.
- the number of subpixels provided in one pixel is the same in the column direction and the row direction, the number of subpixels in the row direction and the number of subpixels in the column direction are both ⁇ ( M ⁇ 2) ⁇ 2 ⁇ , and the number of subpixels per pixel is ⁇ (M ⁇ 2) ⁇ 2 ⁇ 2 .
- the arrangement is performed according to the arrangement mode A so that the difference in current efficiency between adjacent sub-pixels is minimized.
- the shape of one pixel can be made square without particularly adjusting the shape of each subpixel.
- the effect of the order of forming the light emitting layers of the respective colors was not mentioned, but the order of film formation is also important in suppressing the deterioration in image quality due to the misalignment of the light emitting layers. Become an element. Therefore, in this embodiment, the effect of the film formation order will be described.
- FIGS. 9A to 9H a case where one pixel is composed of sub-pixels 2R (1), 2G, 2R (2), and 2B will be described as an example.
- the light emitting layer 23R (1) is the lower layer of the light emitting layers 23R (1) and 23G, and the light emitting layer 23G is It is the upper layer.
- the pattern (3) shown in FIG. 9A focusing on the overlapping region (color mixture region)
- the light emitting layer 23R (1) is the lower layer of the light emitting layers 23R (1) and 23G
- the light emitting layer 23G is It is the upper layer.
- the light emitting layer 23B is the lower layer of the light emitting layers 23R (2) and 23B, and the light emitting layer 23R ( 2) is the upper layer.
- the pattern (7) shown in FIG. 9E when attention is paid to the overlapping region (color mixture region), the light emitting layer 23B is the lower layer of the light emitting layers 23R (2) and 23B, and the light emitting layer 23R ( 2) is the upper layer.
- the light emitting layer of the organic EL element generally has a property that light is easily emitted in a region close to the anode side.
- the lower light emitting layer 23R (1) which is the lower layer is easier to emit light.
- the light emitting layer 23B on the intrusion side which is the lower layer becomes easier to emit light.
- the lower light emitting layer 23R (1) which is the lower layer, emits light more easily, but the lower light emitting layer 23R (1) ) Is lower than the current efficiency of the upper light emitting layer 23G, the effect is canceled (cancelled).
- the lower light emitting layer 23B which is the lower layer, emits light more easily, but the current efficiency of the lower light emitting layer 23B is higher. Since the current efficiency of the light emitting layer 23R (2) is lower than that, the effect is offset.
- the order of film formation of each of the light emitting layers 23R (1), 23G, 23R (2), and 23B is set in ascending order of current efficiency (that is, [B] ⁇ [R] in this case). ⁇ [G]), the effect can be further improved.
- this embodiment is limited to the case where the light emitting layer having the intermediate current efficiency is formed between the light emitting layer having the maximum current efficiency and the light emitting layer having the minimum current efficiency as described above. It is not something.
- each pixel 2 includes three sub-pixels, an R sub-pixel, a B sub-pixel, and a G sub-pixel, and has a conventional sub-pixel arrangement in which the G light-emitting layer and the B light-emitting layer are adjacent to each other. Even in this case, by defining the film formation order as described above, it is possible to suppress a decrease in image quality due to the positional deviation of the light emitting layer.
- FIG. 16 are diagrams schematically showing modified examples of the sub-pixel arrangement constituting each pixel 2 in the organic EL display device 1.
- positional deviation occurs in any of the light emitting layers 23R, 23G, and 23B in the three sub-pixels 2R, 2G, and 2B constituting each pixel 2. Assume that a light emitting layer in one subpixel of two adjacent subpixels enters a light emitting region in the other subpixel.
- the light emitting areas of the R, G, and B sub-pixels are the exposed portions 15R, 15G, and R of the edge cover 15 in the sub-pixels 2R, 2G, and 2B, respectively. Indicated by 15B.
- the light emitting layer 23R is the lower layer and the light emitting layer 23G is the upper layer of the light emitting layers 23R and 23G.
- the light emitting layer 23B is the lower layer and the light emitting layer 23G is the upper layer of the light emitting layers 23G and 23B. ing.
- the stacking order of the light emitting layers is reversed, and after the first electrode 21 is formed, the light emitting layer having higher current efficiency is deposited first. Can be done.
- the light emitting layers of the respective colors are formed according to the order of the current efficiency of the light emitting layers of the respective colors so that the light emitting layer having the smaller current efficiency in the overlapping region is positioned on the anode side. You just have to do it.
- At least three rows of vapor deposition film patterns having different current efficiencies are provided in the same plane, and two adjacent vapor deposition film patterns are separated from the vapor deposition film pattern having the maximum current efficiency and the minimum.
- FIG. 17 is a cross-sectional view showing a schematic configuration of the organic EL display device 1 according to the present embodiment.
- the thickness of the hole transport layer is optimized by changing each color of R, G, and B, that is, for each of the sub-pixels 2R, 2G, and 2B. .
- each pixel 2 includes blue sub-pixels 2B (1) and 2B (2) that emit blue light, red sub-pixels 2R that emit red light,
- the green sub-pixel 2G that emits green light includes four sub-pixels 2B (1) ⁇ 2R ⁇ 2B (2) ⁇ 2G.
- the sub-pixels 2B (1), 2R, 2B (2), and 2G are provided with corresponding light emitting layers 23B (1), 23R, 23B (2), and 23G, respectively.
- the organic EL display device 1 shown in FIG. 17 has a hole injection layer 22A and a hole transport layer 28B (1) instead of the hole injection layer / hole transport layer 22 in the organic EL display device 1 shown in FIG. ), 28R, 28B (2), and 28G.
- the hole transport layers 28B (1), 28R, 28B (2), and 28G are made of the same material and differ only in film thickness.
- the hole transport layer 28B (1) and the light emitting layer 23B are respectively formed from the hole injection layer 22A side. They are stacked adjacently in order.
- the hole transport layers 28B (1), 28R, 28B (2), and 28G are separately formed. (Pattern formation) is performed.
- FIG. 18 is a flowchart showing manufacturing steps of the organic EL display device 1 shown in FIG. 17 in the order of steps.
- the manufacturing method of the organic EL display device 1 replaces the hole injection layer / hole transport layer deposition step (S2) with a hole injection layer deposition step (S21). And a hole transport layer deposition step (S22).
- step S2 the processes other than step S2 are basically the same except for the change (that is, the change of the mask pattern) associated with the configuration of each pixel 2 by the sub-pixels 2B (1), 2R, 2B (2), and 2G.
- the description is abbreviate
- the TFT substrate 10 manufactured in the same manner as in the TFT substrate manufacturing step (S1) in the first embodiment is first subjected to reduced pressure baking for dehydration and in the same manner as in the first embodiment.
- Oxygen plasma treatment is performed as the surface cleaning of the first electrode 21.
- the hole injection layer 22A is vapor-deposited on the entire display region in the TFT substrate 10 in the same manner as in the first embodiment (S21).
- m-MTDATA (4,4′4 ′′ -tris (N-3-methylphenyl-N-phenylamino) -triphenylamine) is used as the material of the hole injection layer 22A,
- the film thickness was 30 nm.
- the hole transport layers 28B (1), 28R, 28B (2), and 28G are separately deposited (S22).
- the hole transport layer 28R of the sub-pixel 2R is formed by using the same vapor deposition method as that of the light-emitting layers 23B (1), 23R, 23B (2), and 23G.
- the TFT substrate 10 on which the hole transport layer 28R is formed is shifted in a direction perpendicular to the substrate scanning direction, and is used for the sub-pixels 2B (1) and 2B (2) in the same manner as the hole transport layer 28R. Hole transport layers 28B (1) and 28B (2) are formed.
- the TFT substrate 10 on which the hole transport layers 28B (1), 28R, and 28B (2) are formed is shifted in a direction perpendicular to the substrate scanning direction, and the hole transport layers 28B (1), 28R, and 28B (2 ), The hole transport layer 28G for the sub-pixel 2G is formed.
- the film thicknesses of the hole transport layers 28B (1), 28R, 28B (2), and 28G are the deposition target substrate 200 for each of the sub-pixels 2B (1), 2R, 2B (2), and 2G. It can be changed by changing the scanning speed and the number of reciprocations of the TFT substrate 10.
- the sub-pixel 2R, the sub-pixel 2B (1) ⁇ 2B (2), and the sub-pixel 2G are arranged in this order (that is, the hole transport layer 28R, the hole transport layer 28B (1) ⁇ 28B (2),
- the film thicknesses of the hole transport layers 28B (1), 28R, 28B (2), and 28G are set so that the film thicknesses increase in the order of the hole transport layer 28G.
- ⁇ -NPD is used as the material of the hole transport layers 28B (1), 28R, 28B (2), and 28G, and the respective film thicknesses are, in order, 100 nm, 50 nm, 100 nm, and 150 nm. .
- the film thicknesses of the hole transport layers 28B (1), 28R, 28B (2), and 28G are variable for each color sub-pixel (each sub-pixel 2B (1) ⁇ 2R ⁇ 2B (2) ⁇ 2G). By doing so, the microcavity effect can be optimized for each color.
- microcavity effect means that light generated between the first electrode 21 and the second electrode 26 reciprocates due to an optical resonance structure formed in each pixel (for example, R, G, and B). As a result, the emission spectrum is sharpened and the color purity is improved.
- the film thickness of a specific organic layer can be adjusted. There is a way to make it variable.
- the film thicknesses of the hole transport layers 28B (1), 28R, 28B (2), and 28G are varied for each color (each subpixel 2B (1), 2R, 2B (2), and 2G)
- the total film thickness changes at the boundary between both sub-pixels.
- the G hole transport layer having the maximum film thickness and the R hole transport layer having the minimum film thickness are adjacent to each other, the total film thickness varies greatly between adjacent sub-pixels.
- the thickness of the hole transport layer is used instead of the current efficiency of the light emitting layer as a parameter for determining the arrangement pattern of the sub-pixels.
- the arrangement pattern of the subpixels may be determined so that the difference in film thickness of the hole transport layer between the matching subpixels is minimized.
- the change in the total film thickness described above can be suppressed by simply replacing the current efficiency difference of the light emitting layer with the film thickness difference of the hole transport layer without enlarging the non-light emitting region between the sub-pixels. .
- the reliability and display quality of the organic EL display device 1 can be improved.
- the current efficiency of the light emitting layer decreases in the order of [G] ⁇ [B] ⁇ [R], or the current efficiency of the light emitting layer is [R] ⁇ [B] ⁇ What is necessary is just to make it small in order of [G].
- the light emitting layers 23B (1), 23R, 23B (2), and 23G may be formed in order of increasing current efficiency as described above. That is, for example, when the current efficiency of the light emitting layer increases in the order of [B] ⁇ [R] ⁇ [G], the light emitting layers 23B (1) and 23B (2), the light emitting layer 23R, and the light emitting layer 23G in this order.
- the light emitting layers 23B (1), 23R, 23B (2), and 23G may be formed.
- the order of formation of the hole transport layer of each color and the order of formation of the light emitting layer of each color do not necessarily need to match, and as described above, depending on the parameters for determining these arrangement patterns, as appropriate for each layer It may be changed.
- the film thicknesses of the hole transport layers 28B (1), 28R, 28B (2), and 28G are changed for each color.
- the present embodiment is not limited to this. Is not to be done.
- the hole transport layer 28B (1) / 28R / 28B (2) / 28G but also the hole injection layer 22A, the electron transport layer 24, the electron injection layer 25, or the carrier blocking layer (not shown) described above,
- the film thickness may be changed for each color.
- the display substrate according to each of the above embodiments has a plurality of pixel regions each including at least three color light-emitting regions each having a light-emitting layer made of a vapor deposition film as sub-pixel regions.
- the light emitting areas are the light emitting area of the light emitting layer having the maximum current efficiency and the light emitting area of the color light emitting layer having the minimum current efficiency when light of the same luminance is generated in the light emitting layers of the light emitting areas of the respective colors. It is a light emitting region of a combination other than the combination.
- the method for manufacturing a display substrate according to each of the above embodiments includes a display having a plurality of pixel regions each including at least three color light-emitting regions each having a light-emitting layer made of a vapor deposition film as sub-pixel regions.
- a method for manufacturing a substrate for a light source wherein when light having the same luminance is generated in the light emitting layer of each color light emitting region, between the light emitting layer having the highest current efficiency and the light emitting layer having the lowest current efficiency. And forming at least one color light-emitting layer having a current efficiency of a magnitude between the current efficiency of the light-emitting layer having the highest current efficiency and the current efficiency of the light-emitting layer having the smallest current efficiency. It is.
- two adjacent light emitting regions of the light emitting layer having the maximum current efficiency and the light emitting region of the light emitting layer having the minimum current efficiency are adjacent to each other.
- the difference in current efficiency between the two light emitting regions can be reduced. Therefore, even if the light emitting layer (evaporated film) of one of the two adjacent light emitting regions penetrates into the other light emitting region, the degree of color mixing (degree of color change) due to the penetration is greater than in the past. Since it can suppress, the fall of the display quality resulting from position shift of a vapor deposition film can be suppressed, without expanding a non-light-emission area
- the display substrate has a configuration in which the light emitting regions of the light emitting layers of the respective colors are arranged in a one-dimensional direction, and are arranged so that a difference in current efficiency between the light emitting layers in adjacent light emitting regions is minimized. It is desirable to have.
- the light emitting regions of the light emitting layers of the respective colors are arranged in a one-dimensional direction, so that the difference in current efficiency between the light emitting layers in adjacent light emitting regions is minimized. It is desirable that the light emitting layer be formed.
- the degree of color mixture due to the intrusion.
- the degree of image quality can be suppressed most, and as a result, the deterioration of image quality can be suppressed most.
- the display substrate includes at least (M ⁇ 1) ⁇ 2 sub-pixel areas each including a light-emitting area of M (M ⁇ 3) color, and the largest one in the pixel area. It is desirable to have a structure including one light emitting region of the light emitting layer having the current efficiency and one light emitting region of the light emitting layer having the minimum current efficiency.
- the sub-pixel regions are arranged so that the sub-pixel region having the maximum current efficiency and the sub-pixel region having the minimum current efficiency are not adjacent to each other, and one pixel is formed with as few sub-pixel regions as possible. Can be configured.
- the pixel region includes, as the sub-pixel region, three color light-emitting regions each having a green, red, and blue light-emitting layer, and the light-emitting region having the green light-emitting layer and the blue light-emitting region. It is desirable to have a structure in which a light emitting region having a red light emitting layer is provided between the light emitting region having a layer.
- the light emitting region of the green light emitting layer having the maximum current efficiency and the light emitting region of the blue light emitting layer having the minimum current efficiency are adjacent to each other. The difference in current efficiency can be reduced.
- the display substrate includes a light emitting region having four colors each having a green, yellow, red, and blue light emitting layer as the sub pixel region, and a light emitting region having a green light emitting layer and a blue color. It is desirable that a light emitting region having a yellow light emitting layer and a light emitting region having a red light emitting layer are provided between the light emitting region having the light emitting layer.
- the light emitting region of the green light emitting layer having the maximum current efficiency and the light emitting region of the blue light emitting layer having the minimum current efficiency are adjacent to each other. The difference in current efficiency can be reduced.
- the light emitting regions of the light emitting layers of the respective colors are arranged in a two-dimensional direction, and the current efficiency difference between the light emitting layers in the light emitting regions adjacent to each other in the one dimensional direction is orthogonal to the one dimensional direction. It is desirable to have a configuration in which the difference in current efficiency between the light emitting layers in the light emitting regions adjacent to each other is minimized.
- the light emitting regions of the light emitting layers of the respective colors are arranged in a two-dimensional direction, the difference in current efficiency between the light emitting layers in the light emitting regions adjacent to each other in the one-dimensional direction, and the one-dimensional direction It is desirable that the light emitting layers of the respective colors are formed so that the difference in current efficiency between the light emitting layers in the light emitting regions adjacent to each other in the direction orthogonal to the above is minimized.
- the configuration and the manufacturing method even when a light emitting layer in one light emitting region of two light emitting regions adjacent to each other in the one dimensional direction enters the other light emitting region, the direction and the direction orthogonal to the one dimensional direction are perpendicular to each other. Even when the light emitting layer in one of the two adjacent light emitting regions penetrates into the other light emitting region, the degree of color mixture (degree of color change) due to the penetration can be suppressed most. As a result, it is possible to suppress the deterioration of image quality most.
- the display substrate includes at least (M ⁇ 2) ⁇ 4 sub-pixel regions each having a light-emitting region of M (M ⁇ 3) color, and a maximum current in one pixel region. It is preferable that the light emitting layer of the light emitting layer having the efficiency and the light emitting region of the light emitting layer of the color having the minimum current efficiency are included in each one.
- the sub-pixel regions are arranged so that the sub-pixel region having the maximum current efficiency and the sub-pixel region having the minimum current efficiency are not adjacent to each other, and one pixel is formed with as few sub-pixel regions as possible. And a pixel in which the difference in current efficiency between two adjacent sub-pixel regions is minimized.
- the display substrate has a configuration in which one pixel region includes ⁇ (M ⁇ 2) ⁇ 2 ⁇ 2 sub-pixel regions each including a light emitting region of M (M ⁇ 3) color. Is desirable.
- the sub-pixel regions are arranged so that the sub-pixel region having the maximum current efficiency and the sub-pixel region having the minimum current efficiency are not adjacent to each other, and one pixel is formed with as few sub-pixel regions as possible. And a square pixel in which the difference in current efficiency between two adjacent sub-pixel regions is minimized.
- the light emitting regions of the light emitting layers of the respective colors are arranged in a two-dimensional direction, it is desirable that at least one of the light emitting layer and the light emitting region has an octagonal shape.
- the distance between the light emitting regions of two adjacent light emitting layers in the oblique direction can be increased, so that one of the adjacent light emitting layers is prevented from entering the light emitting region of the other light emitting layer. It is possible to prevent color mixing due to this.
- the display substrate preferably has a structure in which a thin film transistor is provided in each light emitting region.
- a thin film transistor is provided in each light emitting region to form a display panel, that is, for example, when an organic electroluminescence display device is manufactured using the display substrate, it is formed in one pixel.
- the display definition of the sub-pixels in the light emitting layer of the same color can be improved.
- the display substrate according to the example of the embodiment includes at least three vapor deposition film patterns having different film thicknesses in the same plane, and two adjacent vapor deposition film patterns are It is a vapor deposition film pattern of combinations other than the combination of the vapor deposition film pattern which has the largest film thickness, and the vapor deposition film pattern which has the minimum film thickness.
- At least three rows of vapor deposition film patterns with different film thicknesses are provided in the same plane, and two adjacent vapor deposition film patterns are deposited with the vapor deposition film pattern having the maximum film thickness and the vapor deposition film having the minimum film thickness. Since it was set as the vapor deposition film pattern of combinations other than the combination with a film pattern, compared with the structure where the vapor deposition film pattern with the maximum film thickness and the vapor deposition film pattern with the minimum film thickness are adjacent to each other, two adjacent vapor depositions The difference in film thickness between the film patterns can be reduced.
- the organic electroluminescence display device includes the display substrate according to any of the above embodiments.
- the method for manufacturing the organic electroluminescence display device includes an anode forming step for forming an anode and a cathode forming step for forming a cathode, and the anode forming step and the cathode.
- the light emitting layer having the smaller current efficiency when the light is generated is formed in the order closer to the anode forming step.
- the present invention is suitable for, for example, a display substrate and an organic EL display device used in a film formation process such as separate formation of an organic layer in an organic EL display device, and a manufacturing method for the display substrate and the organic EL display device. Can be used.
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Abstract
Description
本実施の形態について図1~図10に基づいて説明すれば、以下の通りである。
図4は、本実施の形態にかかる有機EL表示装置1の構成例を示す断面図である。
図1は、本実施の形態にかかる有機EL表示装置1における各画素を構成するサブ画素配列を、上記有機EL表示装置1におけるTFT基板10の1画素領域におけるサブ画素領域の配列として模式的に示す図である。
図3に示すように、有機EL素子20は、低電圧直流駆動による高輝度発光が可能な発光素子であり、第1電極21、有機EL層、第2電極26が、この順に積層されている。
従来は、有機EL表示装置1を構成する1つの画素が、赤(R)、緑(G)、青(B)の配列パターンで配列されていた。
絶縁基板11上には、各サブ画素2R(1)・2G・2R(2)・2Bに対応して、それぞれTFT12を含むサブ画素駆動回路が設けられている。
図6は、本実施の形態で用いられる蒸着装置150の要部の概略構成を示す斜視図である。
図7は、有機EL表示装置1の製造工程を工程順に示すフローチャートである。
以下に、蒸着装置150を用いて発光層23R(1)・23G・23R(2)・23Bの塗り分け形成を行う方法について具体的に説明する。
次に、本実施の形態にかかる有機EL表示装置1におけるサブ画素配列による効果について、TFT基板10における各発光層2R(1)・2G・2R(2)・2Bの蒸着膜パターンの位置ずれと混色との関係から説明する。
以下に、電流効率差と混色の影響との関係について、計算式を用いて説明する。
次に、上記したように各サブ画素2R(1)・2G・2R(2)・2Bを配列したときに蒸着パターンの位置ずれが発生した場合の各サブ画素2R(1)・2G・2R(2)・2Bでの光の挙動について具体的に説明する。
なお、本実施の形態においては、上記したように、カラー表示を行うための最小構成単位の画素がRGBの3原色からなる3色のサブ画素からなり、1つの画素における各色のサブ画素の配列、言い換えれば、TFT基板10の1画素領域における各サブ画素領域における発光層の発光色の並び順を、R/G/R/Bとした場合について説明した。
本実施の形態では、前記したように、各サブ画素2R(1)・2G・2R(2)・2Bに対応して、それぞれ、TFT12を含むサブ画素駆動回路が設けられている場合を例に挙げて説明した。
本実施の形態について主に図11~図15に基づいて説明すれば、以下の通りである。
図11は、本実施の形態にかかるサブ画素配列の一例を模式的に示す図である。図11は、3色のサブ画素で1つの画素2を構成する場合のサブ画素の配置例を示している。
ここで、図11に示すようにサブ画素を二次元的に配列して1画素を構成する場合の蒸着方式について説明する。
次に、本実施の形態におけるサブ画素配列について説明する。
なお、本実施の形態でも、1画素を3原色のサブ画素で構成する場合を例に挙げて説明したが、本実施の形態はこれに限定されるものではない。すなわち、1つの画素におけるサブ画素の色数は、3色に限らず、4色以上でもよい。
本実施の形態について主に図9の(a)~(h)および図16の(a)~(d)に基づいて説明すれば、以下の通りである。なお、本実施の形態では、主に前記実施の形態1、2との相違点(特に実施の形態1との相違点)について説明するものとし、実施の形態1・2で用いた構成要素と同一の機能を有する構成要素には同一の番号を付し、その説明を省略する。
まず、最大の電流効率を有する発光層と最小の電流効率を有する発光層との間に、その中間の電流効率を有する発光層を形成する場合について、図9の(a)~(h)に示すように、1画素がサブ画素2R(1)・2G・2R(2)・2Bで構成されている場合を例に挙げて説明する。
なお、本実施の形態は、上記したように最大の電流効率を有する発光層と最小の電流効率を有する発光層との間に、その中間の電流効率を有する発光層を形成する場合に限定されるものではない。
本実施の形態について主に図17および図18に基づいて説明すれば、以下の通りである。なお、本実施の形態では、主に前記実施の形態1~3との相違点について説明するものとし、実施の形態1~3で用いた構成要素と同一の機能を有する構成要素には同一の番号を付し、その説明を省略する。
以上のように、上記各実施の形態にかかる表示用基板は、蒸着膜からなる発光層をそれぞれ有する少なくとも3色の発光領域をサブ画素領域として含む複数の画素領域を有し、隣り合う2つの発光領域は、各色の発光領域の発光層で同一の輝度の光を発生させたときに最大の電流効率を有する色の発光層の発光領域と最小の電流効率を有する色の発光層の発光領域との組み合わせ以外の組み合わせの発光領域である。
2 画素
2R・2R(1)・2R(2)・2G・2B・2B(1)・2B(2) サブ画素
10 TFT基板(表示用基板)
11 絶縁基板
12 TFT(薄膜トランジスタ)
13 層間絶縁膜
13a コンタクトホール
14 配線
14G ゲート線
14S ソース線
14V 電源配線
15 エッジカバー
15R・15R(1)・15R(2) 露出部
15G 露出部
15B・15B(1)・15B(2) 露出部
15r・15g・15r・15b 非発光領域
20 有機EL素子
21 第1電極
22 正孔注入層兼正孔輸送層
22A 正孔注入層
23R・23R(1)・23R(2) 発光層
23G 発光層
23B・23B(1)・23B(2) 発光層
24 電子輸送層
25 電子注入層
26 第2電極
28B(1)・28R・28B(2)・28G 正孔輸送層
30 接着層
40 封止基板
102 マスク
102a 開口部
103 蒸着源
103a 射出口
150 蒸着装置
200 被成膜基板
300 制限板
301 開口部
302 蒸着源
303 マスク
304 開口部
500 マスクユニット
600 真空チャンバ
Claims (16)
- 蒸着膜からなる発光層をそれぞれ有する少なくとも3色の発光領域をサブ画素領域として含む複数の画素領域を有し、
隣り合う2つの発光領域は、各色の発光領域の発光層で同一の輝度の光を発生させたときに最大の電流効率を有する色の発光層の発光領域と最小の電流効率を有する色の発光層の発光領域との組み合わせ以外の組み合わせの発光領域であることを特徴とする表示用基板。 - 各色の発光層の発光領域は、一次元方向に配列されているとともに、隣り合う発光領域における発光層間の電流効率の差が最小となるように配列されていることを特徴とする請求項1に記載の表示用基板。
- 1つの画素領域は、M(M≧3)色の発光領域からなる少なくとも(M-1)×2のサブ画素領域を備え、1つの画素領域中に、最大の電流効率を有する色の発光層の発光領域と最小の電流効率を有する色の発光層の発光領域とがそれぞれ1つ含まれていることを特徴とする請求項2に記載の表示用基板。
- 上記画素領域は、上記サブ画素領域として、緑色、赤色、青色の発光層をそれぞれ有する3色の発光領域を備え、
緑色の発光層を有する発光領域と青色の発光層を有する発光領域との間に赤色の発光層を有する発光領域が設けられていることを特徴とする請求項1~3の何れか1項に記載の表示用基板。 - 上記画素領域は、上記サブ画素領域として、緑色、黄色、赤色、青色の発光層をそれぞれ有する4色の発光領域を備え、
緑色の発光層を有する発光領域と青色の発光層を有する発光領域との間に、黄色の発光層を有する発光領域と赤色の発光層を有する発光領域とが設けられていることを特徴とする請求項1~3の何れか1項に記載の表示用基板。 - 各色の発光層の発光領域は、二次元方向に配列されているとともに、一次元方向に隣り合う発光領域における発光層間の電流効率の差および上記一次元方向に直交する方向に隣り合う発光領域における発光層間の電流効率の差がそれぞれ最小となるように配列されていることを特徴とする請求項1に記載の表示用基板。
- 1つの画素領域は、M(M≧3)色の発光領域からなる少なくとも(M-2)×4のサブ画素領域を備え、一画素領域中に、最大の電流効率を有する色の発光層の発光領域と最小の電流効率を有する色の発光層の発光領域とがそれぞれ1つ含まれていることを特徴とする請求項6に記載の表示用基板。
- 1つの画素領域は、M(M≧3)色の発光領域からなる{(M-2)×2}2のサブ画素領域を備えていることを特徴とする請求項6に記載の表示用基板。
- 上記発光層および発光領域の少なくとも一方は八角形状であることを特徴とする請求項6~8の何れか1項に記載の表示用基板。
- 各発光領域に薄膜トランジスタが設けられていることを特徴とする請求項1~9の何れか1項に記載の表示用基板。
- 同一平面内に、膜厚が異なる蒸着膜パターンが少なくとも3列設けられており、
隣り合う2つの蒸着膜パターンは、最大の膜厚を有する蒸着膜パターンと最小の膜厚を有する蒸着膜パターンとの組み合わせ以外の組み合わせの蒸着膜パターンであることを特徴とする表示用基板。 - 請求項1~11の何れか1項に記載の表示用基板を備えていることを特徴とする有機エレクトロルミネッセンス表示装置。
- 蒸着膜からなる発光層をそれぞれ有する少なくとも3色の発光領域をサブ画素領域として含む複数の画素領域を有する表示用基板の製造方法であって、
各色の発光領域の発光層で同一の輝度の光を発生させたときに電流効率が最も大きい色の発光層と電流効率が最も小さい色の発光層との間に、上記電流効率が最も大きい色の発光層の電流効率と電流効率が最も小さい色の発光層の電流効率との間の大きさの電流効率を有する色の発光層を少なくとも一つ形成することを特徴とする表示用基板の製造方法。 - 上記各色の発光層の発光領域は、一次元方向に配列されており、隣り合う発光領域における発光層間の電流効率の差が最小となるように上記各色の発光層を形成することを特徴とする請求項13に記載の表示用基板の製造方法。
- 各色の発光層の発光領域は、二次元方向に配列されており、一次元方向に隣り合う発光領域における発光層間の電流効率の差および上記一次元方向に直交する方向に隣り合う発光領域における発光層間の電流効率の差がそれぞれ最小となるように上記各色の発光層を形成することを特徴とする請求項13に記載の表示用基板の製造方法。
- 陽極を形成する陽極形成工程と、陰極を形成する陰極形成工程とを備えるとともに、
陽極形成工程と陰極形成工程との間に、蒸着膜からなる少なくとも3色の発光層を色ごとに順に形成する発光層形成工程とを備え、
上記発光層形成工程では、各色の発光領域の発光層で同一の輝度の光を発生させたときに電流効率が小さい色の発光層ほど陽極形成工程に近い順番で形成されることを特徴とする有機エレクトロルミネッセンス表示装置の製造方法。
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CN107275360B (zh) * | 2016-04-01 | 2020-10-16 | 乐金显示有限公司 | 有机发光显示装置 |
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CN111326545B (zh) * | 2018-12-13 | 2024-03-08 | 乐金显示有限公司 | 电致发光显示装置 |
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