WO2023106049A1 - 表示装置および電子機器 - Google Patents
表示装置および電子機器 Download PDFInfo
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- WO2023106049A1 WO2023106049A1 PCT/JP2022/042406 JP2022042406W WO2023106049A1 WO 2023106049 A1 WO2023106049 A1 WO 2023106049A1 JP 2022042406 W JP2022042406 W JP 2022042406W WO 2023106049 A1 WO2023106049 A1 WO 2023106049A1
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- G—PHYSICS
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- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
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- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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Definitions
- the present disclosure relates to a display device and an electronic device including the same.
- Pulse width modulation driving is widely used in display devices (for example, LED (Light Emitting Diode) display devices) (see Patent Document 1, for example).
- a display device using pulse width modulation driving has a problem that the circuit is complicated and it is difficult to increase the definition of pixels, and the image quality deteriorates due to flicker caused by shortening the pulse at low luminance.
- the above problem can be solved by using the current amplitude modulation method as the driving method of the display device.
- an emission wavelength shift occurs in the light-emitting element due to a change in the current density of the light-emitting element, resulting in color shift in the light-emitting element, which causes another problem of degraded image quality.
- An object of the present disclosure is to provide a display device capable of suppressing deterioration in image quality due to occurrence of color shift, and an electronic device including the same.
- the display device includes: a substrate having a current amplitude modulation type drive circuit; a plurality of first light emitting elements and a plurality of second light emitting elements two-dimensionally arranged on a substrate; a wavelength correction layer capable of correcting the wavelength of light emitted from the plurality of first light emitting elements,
- the drive circuit can independently gamma correct the first signal supplied to the first light emitting element and the second signal supplied to the second light emitting element.
- the display device is a substrate having a current amplitude modulation type drive circuit; a plurality of first light emitting elements and a plurality of second light emitting elements two-dimensionally arranged on a substrate,
- the first light emitting element has a resonator structure capable of correcting light emitted from the first light emitting element,
- the drive circuit can independently gamma correct the first signal supplied to the first light emitting element and the second signal supplied to the second light emitting element.
- An electronic device includes a display device according to the present disclosure.
- the wavelength correction layer may contain at least one selected from the group consisting of color filters, bandpass filters, wavelength cut filters and color conversion layers.
- the wavelength correction layer may comprise a plurality of wavelength correction parts, each wavelength correction part being provided on or above the first light emitting element.
- the wavelength correction section may include at least one selected from the group consisting of a color filter section, a bandpass filter section, a wavelength cut filter section, and a color conversion section.
- the wavelength correction layer may include a light blocking portion around or on the wavelength correction portion.
- the wavelength correction layer has a plurality of openings, each opening may be provided on or above the second light emitting element.
- the plurality of first light emitting elements includes first compound semiconductor light emitting elements capable of emitting red light
- the plurality of second light emitting elements include second compound semiconductor light emitting elements capable of emitting green light. and a third compound semiconductor light emitting device capable of emitting blue light
- the plurality of first light emitting elements includes first compound semiconductor light emitting elements capable of emitting green light
- the plurality of second light emitting elements include second compound semiconductor light emitting elements capable of emitting red light. and a third compound semiconductor light emitting device capable of emitting blue light.
- the plurality of first light emitting elements includes first compound semiconductor light emitting elements capable of emitting blue light
- the plurality of second light emitting elements include second compound semiconductor light emitting elements capable of emitting red light
- a third compound semiconductor light emitting device capable of emitting green light.
- the plurality of first light emitting elements includes a first compound semiconductor light emitting element capable of emitting red light and a second compound semiconductor light emitting element capable of emitting green light, and a plurality of The second light emitting element may include a third compound semiconductor light emitting element capable of emitting blue light.
- the plurality of first light emitting elements includes a first compound semiconductor light emitting element capable of emitting red light and a second compound semiconductor light emitting element capable of emitting blue light, and a plurality of The second light emitting element may include a third compound semiconductor light emitting element capable of emitting green light.
- the plurality of first light emitting elements includes a first compound semiconductor light emitting element capable of emitting green light and a second compound semiconductor light emitting element capable of emitting blue light, and a plurality of The second light emitting element may include a third compound semiconductor light emitting element capable of emitting red light.
- FIG. 1 is a plan view showing an example of the configuration of a display device according to one embodiment.
- FIG. 2 is a cross-sectional view taken along line II-II of FIG.
- FIG. 3 is a cross-sectional view showing an example of the configuration of a compound semiconductor light emitting device.
- FIG. 4 is a block diagram showing an example of the configuration of the drive circuit.
- FIG. 5 is a cross-sectional view showing an example of the configuration of a display device according to a modification.
- FIG. 6 is a cross-sectional view showing an example of the configuration of a display device according to a modification.
- FIG. 7 is a cross-sectional view showing an example of the configuration of a display device according to a modification.
- FIG. 1 is a plan view showing an example of the configuration of a display device according to one embodiment.
- FIG. 2 is a cross-sectional view taken along line II-II of FIG.
- FIG. 3 is a cross-sectional view showing an example of the
- FIG. 8 is a plan view showing an example of the configuration of a display device according to a modification.
- FIG. 9 is a plan view showing an example of the configuration of a display device according to a modification.
- FIG. 10 is a plan view showing an example of the configuration of a display device according to a modification.
- 11A is a cross-sectional view taken along line XIA-XIA in FIG. 10.
- FIG. 11B is a cross-sectional view along line XIB-XIB in FIG. 10.
- FIG. 12 is a cross-sectional view showing an example of the configuration of a display device according to a modification.
- FIG. 13 is a cross-sectional view showing an example of the configuration of a display device according to a modification.
- FIG. 14 is a cross-sectional view showing an example of the configuration of a display device according to a modification.
- FIG. 15 is a cross-sectional view showing an example of the configuration of a display device according to a modification.
- FIG. 16 is a cross-sectional view showing an example of the configuration of a display device according to a modification.
- FIG. 17 is a cross-sectional view showing an example of the configuration of a display device according to a modification.
- FIG. 18 is a cross-sectional view showing an example of the configuration of a display device according to a modification.
- FIG. 19 is a cross-sectional view showing an example of the configuration of a display device according to a modification.
- FIG. 19 is a cross-sectional view showing an example of the configuration of a display device according to a modification.
- FIG. 20 is a diagram showing an example of emission spectra of a compound semiconductor light-emitting device under weak excitation and strong excitation.
- FIG. 21 is a cross-sectional view showing an example of the configuration of a display device according to a modification.
- FIG. 22 is a cross-sectional view showing an example of the configuration of a display device according to a modification.
- FIG. 23 is a diagram showing the emission spectrum of each compound semiconductor light emitting device.
- FIG. 24A is a front view showing an example of the appearance of a digital still camera.
- FIG. 24B is a rear view showing an example of the appearance of the digital still camera.
- FIG. 25 is a perspective view of an example of the appearance of a head mounted display.
- FIG. 26 is a perspective view showing an example of the appearance of a television device.
- FIG. 1 is a plan view showing an example of the configuration of a display device 10 according to one embodiment.
- FIG. 2 is a cross-sectional view taken along line II-II of FIG.
- the display device 10 includes a circuit board 11 and a plurality of pixels 20P.
- the display device 100 is, for example, an LED display device.
- the display device 100 is an example of a light emitting device.
- each layer and each member constituting the display device 10 the surface on the display surface side of the display device 10 is referred to as a first surface, and the surface opposite to the display surface is referred to as a second surface. It says.
- the circuit board 11 is a so-called backplane.
- the circuit board 11 drives a plurality of pixels 20P.
- the first surface of the circuit board 11 is provided with the wiring 11a, the driving circuit 30 shown in FIG. 4, and the like.
- the substrate body of the circuit board 11 may be composed of, for example, a semiconductor that facilitates the formation of transistors or the like, or may be composed of glass or resin with low permeability to moisture and oxygen.
- the substrate body may be a semiconductor substrate, a glass substrate, a resin substrate, or the like.
- Semiconductor substrates include, for example, amorphous silicon, polycrystalline silicon, monocrystalline silicon, or the like.
- the glass substrate includes, for example, high strain point glass, soda glass, borosilicate glass, forsterite, lead glass, quartz glass, or the like.
- the resin substrate contains, for example, at least one selected from the group consisting of polymethyl methacrylate, polyvinyl alcohol, polyvinyl phenol, polyethersulfone, polyimide, polycarbonate, polyethylene terephthalate and polyethylene naphthalate.
- a pixel 20P The plurality of pixels 20P are two-dimensionally arranged on the first surface of the circuit board 11 in a prescribed arrangement pattern.
- a pixel 20P is composed of a red sub-pixel 20R, a green sub-pixel 20G, and a blue sub-pixel 20B.
- the red sub-pixel 20R is an example of a first sub-pixel.
- the green sub-pixel 20G and the blue sub-pixel 20B are examples of second sub-pixels.
- the first electrodes of the red sub-pixel 20R, the green sub-pixel 20G and the blue sub-pixel 20B are connected to wiring (not shown) on the circuit board 11 by connecting members 12m such as bumps or vias.
- the second electrodes of the red sub-pixel 20R, the green sub-pixel 20G and the blue sub-pixel 20B are connected to the wiring 11a on the circuit board 11 by connecting members 12n such as bumps or vias.
- the plurality of pixels 20P includes a plurality of compound semiconductor light emitting elements 12R (hereinafter referred to as “light emitting elements 12R”), a plurality of compound semiconductor light emitting elements 12G (hereinafter referred to as “light emitting elements 12G”), and a plurality of compound semiconductor light emitting elements 12B. (hereinafter referred to as “light-emitting element 12B”) and a color filter 13 .
- the green sub-pixel 20G is composed of a light-emitting element 12G and a color filter 13.
- the red sub-pixel 20R is composed of the light emitting element 12R.
- the blue sub-pixel 20B is composed of the light emitting element 12B.
- the red sub-pixel 20R, the green sub-pixel 20G, and the blue sub-pixel 20B are collectively referred to as the sub-pixel 20 without particular distinction.
- the light-emitting elements 12R, 12G, and 12B are collectively referred to as the light-emitting elements 12 without any particular distinction.
- the light emitting element 12G is an example of a first compound semiconductor light emitting element, and the light emitting elements 12R and 12B are examples of a second compound semiconductor light emitting element.
- the plurality of light emitting elements 12G are two-dimensionally arranged on the first surface of the circuit board 11 in a prescribed arrangement pattern such as matrix or delta.
- the light emitting element 12G can emit green light.
- the light emitting element 12G is configured to generate an emission wavelength shift in accordance with a change in the current density of the light emitting element 12G. As shown in FIG. 20, the emission spectrum of the light emitting element 12G may shift to the short wavelength side as the current density increases.
- the light emitting element 12G is a GaN-based compound semiconductor light emitting element
- the emission spectrum of the light emitting element 12G shifts to the short wavelength side as the current density increases.
- the light emitting element 12G is, for example, a green LED element.
- the light emitting element 12G as shown in FIG. 3, includes a compound semiconductor laminate 120G, a first electrode 121G, and a second electrode 122G.
- the compound semiconductor laminate 120G includes a first compound semiconductor layer 123G, a light emitting layer 124G, and a second compound semiconductor layer 125G in this order.
- the second surface of the first compound semiconductor layer 123G faces the first surface of the circuit board 11.
- a part of the second surface of the second compound semiconductor layer 125G is an exposed portion that is not covered with the light emitting layer 124G and the first compound semiconductor layer 123G.
- a first electrode 121G is provided on the second surface of the first compound semiconductor layer 123G.
- a second electrode 122G is provided on the exposed portion of the second compound semiconductor layer 125G.
- the first electrodes 121G are connected to wiring (not shown) on the first surface of the circuit board 11 by connecting members 12m such as bumps or vias.
- the second electrode 122G is connected to the wiring 11a on the first surface of the circuit board 11 by a connection member 12n such as a bump or via.
- the light emitting layer 124G can emit green light.
- the first compound semiconductor layer 123, the light emitting layer 124G, and the second compound semiconductor layer 125G contain, for example, a GaN-based compound semiconductor such as an InGaN-based compound semiconductor or an AlInGaN-based compound semiconductor.
- the first compound semiconductor layer 123 has a first conductivity type
- the second compound semiconductor layer 125G has a second conductivity type opposite to the first conductivity type.
- the first conductivity type may be p-type and the second conductivity type may be n-type, or the first conductivity type may be n-type and the second conductivity type may be p-type.
- the light emitting elements 12G may be connected by a cathode common, or may be connected by an anode common.
- the light emitting element 12R can emit red light.
- the light emitting element 12R is, for example, a red LED element.
- the light emitting element 12R as shown in FIG. 3, includes a compound semiconductor laminate 120R, a first electrode 121R, and a second electrode 122R.
- the compound semiconductor laminate 120R includes, in order, a first compound semiconductor layer 123R, a light emitting layer 124R, and a second compound semiconductor layer 125R.
- the light emitting layer 124R can emit red light.
- the first compound semiconductor layer 123R, the light emitting layer 124R, and the second compound semiconductor layer 125R are, for example, AlGaInP-based compound semiconductors, AlGaInAs-based compound semiconductors, AlGaAs-based compound semiconductors, GaAsP-based compound semiconductors, GaP-based compound semiconductors, or perovskite semiconductors. including.
- the first compound semiconductor layer 123R has a first conductivity type
- the second compound semiconductor layer 125R has a second conductivity type opposite to the first conductivity type.
- the red sub-pixel 20R is the same as the green sub-pixel 20G except for the above points.
- the light emitting element 12B can emit blue light.
- the light emitting element 12B is, for example, a blue LED element.
- the light emitting element 12B includes a compound semiconductor laminate 120B, a first electrode 121B, and a second electrode 122B.
- the compound semiconductor laminate 120B includes a first compound semiconductor layer 123B, a light emitting layer 124B, and a second compound semiconductor layer 125B in this order.
- the light emitting layer 124B can emit blue light.
- the first compound semiconductor layer 123B, the light emitting layer 124B, and the second compound semiconductor layer 125B are, for example, AlInGaN-based compound semiconductors, InGaN-based compound semiconductors, GaN-based compound semiconductors, AlGaN-based compound semiconductors, ZnSe-based compound semiconductors, ZnO-based Including compound semiconductors or perovskite semiconductors.
- the first compound semiconductor layer 123B has a first conductivity type
- the second compound semiconductor layer 125B has a second conductivity type opposite to the first conductivity type.
- the blue sub-pixel 20B is the same as the green sub-pixel 20G except for the above points.
- the color filter 13 is an example of a wavelength correction layer.
- the color filter 13 includes a light blocking portion 13BM and a plurality of green filter portions 13G.
- the light shielding part 13BM is a layer having a plurality of openings 13H.
- the opening 13H penetrates through the display device 10 in the thickness direction.
- Each opening 13H is provided above the light emitting element 12 . That is, the light shielding portion 13BM is provided in a portion between the adjacent light emitting elements 12 in plan view.
- the light shielding portion 13BM is provided around the green filter portion 13G so as to surround the green filter portion 13G in plan view.
- a planar view means a planar view when an object is viewed from a direction perpendicular to the display surface of the display device 10 .
- the light shielding part 13BM has a black color.
- the light shielding portion 13BM can shield light emitted from the light emitting element 12 .
- the light shielding part 13BM may be a black matrix.
- the light shielding portion 13BM includes, for example, a black resist.
- the green filter section 13G is an example of a wavelength correction section.
- the green filter portion 13G is provided inside the opening 13H above the light emitting element 12G.
- the green filter section 13G can correct the emission wavelength shift caused by the current density change of the light emitting element 12G.
- the green filter section 13G can transmit green light among the light emitted from the light emitting element 12G, but can block light other than green light.
- the green filter section 13G may have spectral characteristics in which the peak half-value width (full width at half maximum) is in the range of 490 nm or more and 550 nm or less. It is preferable that the peak wavelength of the light emitting element 12G under weak excitation (see FIG. 20) is closer to the central wavelength of the green filter section 13G than the peak wavelength of the light emitting element 12G under strong excitation (see FIG. 20). As a result, it is possible to suppress a decrease in luminance due to the green filter section 13G.
- the opening 13H above the light emitting element 12R may be hollow or filled with a resin transparent to the red light emitted from the light emitting element 12R.
- the opening 13H above the light emitting element 12B may be hollow, or may be filled with a resin transparent to the blue light emitted from the light emitting element 12B.
- FIG. 4 is a block diagram showing an example of the configuration of the drive circuit 30 provided in the display device 10 according to one embodiment.
- the drive circuit 30 includes an image data input interface (hereinafter referred to as "data input I/F") 31, a timing controller 32, a gamma correction circuit 33A, a gamma correction circuit 33B, a horizontal scanning driver 34, a vertical scanning and a driver 35 .
- the drive circuit 30 is a current amplitude modulation type drive circuit. As described above, the green filter portion 13G as a wavelength correction layer is provided above the wavelength-shifting light emitting element 12G. The luminance of the green sub-pixel 20G may be lowered by providing the green filter section 13G as described above.
- the drive circuit 30 is configured to be able to control the brightness of the light emitting element 12G so as to compensate for such a decrease in brightness. In other words, the drive circuit 30 is configured to set different gamma parameters for the light emitting element 12G and the light emitting elements 12R and 12B so as to apply the gain corresponding to the reduction in luminance by the green filter section 13G. .
- the light emitting element array 36 is composed of a plurality of light emitting elements 12 arranged two-dimensionally.
- a plurality of signal lines and a plurality of scanning lines are provided on the first surface of the circuit board 11 .
- the plurality of signal lines and the plurality of signal lines are arranged orthogonal to each other.
- a plurality of light emitting elements 12 are provided corresponding to the intersections of the signal lines and the scanning lines, respectively.
- the timing controller 32, the gamma correction circuit 33A and the gamma correction circuit 33B may be composed of dedicated LSI (Large Scale Integration), MPU (Micro-processing unit), ROM (Read Only Memory). and a computer system including RAM (Random Access Memory) and the like.
- the gamma correction circuit 33B may be composed of an IC (Integrated Circuit) separately from the timing controller 32.
- the horizontal scanning driver 34 may be composed of an IC.
- the vertical scanning driver 35 may be composed of an IC.
- the data input I/F 31 is an image input unit for inputting image data 37 .
- the timing controller 32 includes an image processing section 32A and a brightness control section 32B.
- Image processing unit 32A generates image signal SR, image signal SG, and image signal SB based on image data 37 input via data input I/F 31, and converts image signal SR and image signal SG to gamma correction circuit 33A. , and supplies the video signal SG to the gamma correction circuit 33B.
- the video signal SR is a signal for driving the red sub-pixel 20R
- the video signal SG is a signal for driving the green sub-pixel 20G
- the video signal SB is a signal for driving the blue sub-pixel 20B.
- the video signal SR, the video signal SG, and the video signal SB may be R signal, G signal, and B signal, respectively.
- the image processing unit 32A generates a scanning signal based on the image data 37 input via the data input I/F 31 and supplies the vertical scanning driver 35 with the scanning signal.
- the gamma correction circuit 33A gamma-corrects the video signal SR and the video signal SB supplied from the image processing section 32A, and supplies it to the horizontal scanning driver .
- the gamma correction circuit 33B gamma-corrects the video signal SG supplied from the image processing section 32A and supplies it to the horizontal scanning driver .
- the gamma correction circuit 33B gamma-corrects the video signal SG supplied from the image processing section 32A so as to compensate for luminance reduction due to the color filter 13, which is a wavelength correction layer.
- the display device 10 includes two gamma correction circuits, the gamma correction circuit 33A and the gamma correction circuit 33A, for the green sub-pixel 20G including the green filter portion 13G and the red sub-pixel 20R and the blue sub-pixel not including the filter portion. This is to gamma-correct the video signal separately from the sub-pixel 20B.
- the horizontal scanning driver 34 controls the gradation of the red sub-pixel 20R by current amplitude modulation according to the video signal SR supplied from the gamma correction circuit 33A. More specifically, for example, the horizontal scanning driver 34 supplies a current signal with a predetermined amplitude to the red sub-pixel 20R selected via the signal line based on the video signal SR supplied from the gamma correction circuit 33A.
- the horizontal scanning driver 34 controls the gradation of the green sub-pixel 20G by current amplitude modulation according to the video signal SG supplied from the gamma correction circuit 33B. More specifically, for example, the horizontal scanning driver 34 supplies a predetermined current value to the green sub-pixel 20G selected via the signal line based on the video signal SG supplied from the gamma correction circuit 33B.
- the horizontal scanning driver 34 controls the gradation of the blue sub-pixel 20B by current amplitude modulation according to the video signal SB supplied from the gamma correction circuit 33A. More specifically, for example, the horizontal scanning driver 34 supplies a predetermined current value to the blue sub-pixel 20B selected via the signal line based on the video signal SB supplied from the gamma correction circuit 33A.
- the vertical scanning driver 35 scans the sub-pixels 20 on a row-by-row basis when writing video signals to the sub-pixels 20, and sequentially supplies scanning signals to the scanning lines.
- the display device 10 includes a circuit board 11 having a current amplitude modulation type drive circuit 30, and a plurality of light emitting elements 12R, 12G, and 12B two-dimensionally arranged on the first surface of the circuit board 11. and a color filter (wavelength correction layer) 13 capable of correcting the wavelength of light emitted from the plurality of light emitting elements 12G (light whose wavelength is shifted due to changes in the current density of the light emitting elements 12G).
- the drive circuit 30 generates a video signal (first signal) SG supplied to the light emitting element (first light emitting element) 12G and a video signal (first signal) SG supplied to the light emitting elements (second light emitting elements) 12R and 12B, respectively.
- Second signals SR and SB are provided with gamma correction circuits 33A and 33B capable of gamma correction independently.
- wavelength-shifted light is emitted from the light emitting element 12G and enters the green filter portion 13G of the color filter 13 as the current density of the light emitting element 12G changes.
- the green filter section 13G transmits green light out of the wavelength-shifted light, but blocks light other than green light.
- the drive circuit 30 gamma-corrects (amplifies) the video signal SG so as to compensate for the luminance lowered by the green filter section 13G, and drives the light-emitting element 12G by the current amplitude modulation method using the gamma-corrected video signal SG. Therefore, it is possible to suppress deterioration in image quality due to occurrence of color shift in the light emitting element 12G while suppressing a decrease in luminance of the green sub-pixel 20G.
- the display device 10 Since the display device 10 according to one embodiment is driven by the current amplitude modulation method, image quality deterioration (flickering) peculiar to the pulse width modulation method does not occur.
- a general-purpose GaN-based LED element or the like can be used as the green light emitting element 12G instead of using a special and expensive LED element whose wavelength shift is suppressed. Therefore, it is possible to suppress deterioration in image quality due to occurrence of color misregistration while suppressing an increase in the manufacturing cost of the display device 10 .
- white sub-pixels without color filters i.e., white light-emitting elements
- red, green, and blue sub-pixels configured by combining white light-emitting elements and color filters.
- one pixel must be composed of four sub-pixels, which complicates the structure of the display device. Therefore, it may become difficult to increase the definition of the display device.
- the display device 10 according to one embodiment has a configuration in which the color filter (the green filter portion 13G) is provided only above the green light emitting element 12G, the structure of the display device 10 can be simplified. Therefore, it is easy to increase the definition of the display device 10 .
- the color filter 13 since the color filter 13 includes only the green filter portion 13G, it is not necessary to select the material of the green filter portion 13G in consideration of the materials of the blue filter portion and the red filter portion. , the degree of freedom of material selection for the green filter portion 13G is high.
- a red color filter portion, a green color filter portion, and a blue color filter portion are made of the same material. Since the blue filter is provided above the short-wavelength blue light emitting element, the blue filter section is more susceptible to photodegradation than the green filter section and the red filter section. For this reason, materials for the red color filter portion, the green color filter portion, and the blue color filter portion are generally selected in consideration of the photodegradation of the blue filter.
- the color filter 13 since the color filter 13 includes only the green filter portion 13G, the material of the green filter portion 13G can be selected without considering the optical deterioration of the blue filter portion. can. Therefore, the degree of freedom of material selection for the green filter portion 13G is increased. Therefore, the manufacturing cost of the display device 10 can be reduced.
- the color filter 13 does not include the blue filter portion, which is more susceptible to photodegradation than the green filter portion 13G. can be placed. Therefore, the luminous efficiency of the display device 10 can be improved.
- the number of processes can be reduced because it is not necessary to separately apply three color filters.
- the red sub-pixel 20R and the blue sub-pixel 20B are not provided with a filter section, it is possible to prevent the brightness of the red sub-pixel 20R and the blue sub-pixel 20B from decreasing due to the color filter. .
- the color filter 13 includes only the green filter portion 13G, it is possible to increase the positional deviation margin of the color filter 13 compared to the case where the color filter includes the red color filter portion, the green color filter portion, and the blue color filter portion. can.
- Modification 1 Modification 1
- the example in which the display device 10 includes the color filter 13 as the wavelength correction layer has been described, but the wavelength correction layer is not limited to the color filter 13 .
- the display device 10 may include a color conversion layer 14G as a wavelength correction layer instead of the color filter 13.
- the color conversion layer 14G can convert the wavelength-shifted light into green light as the current density of the light emitting element 12G changes. That is, the color conversion layer 14G can correct the emission wavelength shift caused by the current density change of the light emitting element 12G.
- the color conversion layer 14G may be provided directly on the first surface of the light emitting element 12 or may be provided above the first surface of the light emitting element 12. Note that FIG. 5 shows an example in which the color conversion layer 14G is provided on the first surface of the light emitting element 12. As shown in FIG.
- the color conversion layer 14G contains, for example, at least one selected from the group consisting of quantum dots (semiconductor particles) and phosphors.
- the display device 10 may include a compound semiconductor light-emitting element 15G (hereinafter referred to as "light-emitting element 15G") that also functions as a wavelength correction layer instead of the light-emitting element 12G.
- Light emitting element 15G has a resonator structure.
- the resonator structure is configured to resonate and emphasize the green light contained in the light whose wavelength has been shifted as the current density of the light emitting element 15G changes. Therefore, the resonator structure can correct the wavelength-shifted light due to the current density change of the light emitting element 15G.
- the display device 10 includes a compound semiconductor light emitting element 12UV (hereinafter referred to as "light emitting element 12UV”) instead of the light emitting element 12G, and a wavelength correction layer instead of the color filter 13.
- a color conversion layer 16G may be provided.
- the light emitting element 12UV can emit ultraviolet rays.
- the light emitting element 12B is, for example, a UV LED element.
- the color conversion layer 16G can convert ultraviolet rays emitted from the light emitting elements 12UV into green light.
- the color conversion layer 16G may be provided directly on the first surface of the light emitting element 12UV, or may be provided above the first surface of the light emitting element 12UV. Note that FIG. 7 shows an example in which the color conversion layer 16G is directly provided on the first surface of the light emitting element 12UV.
- the color conversion layer 16G contains, for example, at least one selected from the group consisting of quantum dots (semiconductor particles) and phosphors.
- the red sub-pixel 20R, the green sub-pixel 20G and the blue sub-pixel 20B have the same area, but as shown in FIG. 20R and may be larger than the area of the blue sub-pixel 20B. As a result, it is possible to suppress a decrease in luminance of the green sub-pixel 20G due to the color filter 13.
- FIG. 20G the area of green subpixel 20G may be about twice the area of red subpixel 20R or blue subpixel 20B.
- the area of the green sub-pixel 20G is larger than the area of the red sub-pixel 20R and the blue sub-pixel 20B, as shown in FIG. It may be provided only around the green sub-pixel 20G. Since the area of the green sub-pixel 20G is larger than the area of the red sub-pixel 20R and the blue sub-pixel 20B, even if the light shielding portion 13BM is provided around the green sub-pixel 20G, the reduction in the area of the green sub-pixel 20G is suppressed. be able to. Therefore, it is possible to suppress a decrease in luminance of the green sub-pixel 20G due to the provision of the light shielding portion 13BM.
- FIG. 11B may be composed of one red sub-pixel 20R, two green sub-pixels 20G and one blue sub-pixel 20B.
- color filters 13 may be provided adjacently on a plurality of light emitting elements 12 . In this case, it is possible to suppress the light emitted from the light emitting elements 12R and 12B from entering the green filter portion 13G, thereby suppressing color mixture.
- the display device 10 may comprise a protective layer 17 on the first surface of the circuit board 11, as shown in FIG.
- a plurality of light emitting elements 12 are provided within a protective layer 17 .
- the protective layer 17 shields the plurality of light emitting elements 12 from the outside air, and can suppress moisture intrusion into the light emitting elements 12 from the external environment.
- the protective layer 17 has insulating properties and is transparent to visible light. In this specification, visible light refers to light in the wavelength range of 360 nm to 830 nm.
- the protective layer 17 contains, for example, a polymer resin or an inorganic material with low hygroscopicity.
- Polymer resins include, for example, at least one selected from the group consisting of thermosetting resins, ultraviolet-curable resins, and the like.
- the polymer resin may be an underfill material.
- the inorganic material is, for example, selected from the group consisting of silicon oxide (SiO x ), silicon nitride (SiN x ), silicon oxynitride (SiO x N y ), titanium oxide (TiO x ) and aluminum oxide (AlO x ). contains at least one
- the color filter 13 may be provided on the first surface of the protective layer 17 .
- the color filter 13 may not include the light shielding portion 13BM as shown in FIG. 12, or may include the light shielding portion 13BM as shown in FIG.
- FIG. 14 shows an example in which the color filter 13 does not include the light shielding portion 13BM (see FIG. 2)
- the color filter 13 may include the light shielding portion 13BM.
- some of the plurality of openings 13H are provided on the first surface of the light emitting element 12R, and the rest of the plurality of openings 13H are provided on the first surface of the light emitting element 12B. good too.
- the display device 10 may include a counter substrate 18 facing the first surface of the circuit board 11, as shown in FIG.
- the counter substrate 18 may have the color filters 13 on the second surface facing the circuit board 11 .
- FIG. 15 shows an example in which the color filter 13 does not include the light shielding portion 13BM (see FIG. 2), the color filter 13 may include the light shielding portion 13BM.
- the counter substrate 18 has transparency to visible light.
- the counter substrate 18 includes, for example, glass or polymer resin.
- FIG. 7 An example in which the display device 10 has a top emission structure in which the light emitted from the light emitting element 12 is extracted from the side opposite to the circuit board 11 (see FIG. 2) has been described.
- 10 may have a bottom emission type structure in which light emitted from the light emitting element 12 is extracted from the circuit board 19 side, as shown in FIG.
- the circuit board 19 has transparency to visible light.
- a color filter 13 may be provided on the first surface of the circuit board 19 .
- FIG. 16 shows an example in which the color filter 13 does not include the light shielding portion 13BM (see FIG. 2), the color filter 13 may include the light shielding portion 13BM.
- the green filter section 13G may be a layer having a plurality of openings 13GH.
- the opening 13GH penetrates through the display device 10 in the thickness direction. Some of the openings 13GH are provided above the light emitting elements 12R, and the rest of the openings 13GH are provided above the light emitting elements 12B.
- FIG. 18 shows an example in which the light blocking portion 13BM is provided on the upper surface of the green filter portion 13G provided above the light emitting element 12G.
- the light blocking portion 13BM may not be provided on the upper surface of the green filter portion 13G provided.
- the display device 10 may include the wavelength cut filter 21 as the wavelength correction layer as shown in FIG.
- the wavelength cut filter 21 may include a wavelength cut filter portion 21G and a light blocking portion 13BM.
- FIG. 20 is a diagram showing an example of emission spectra of the light emitting element 12G under weak excitation and strong excitation.
- the emission spectrum of the light emitting element 12G shifts to the short wavelength side as the current density increases, for example.
- the wavelength cut filter section 21G is a short wavelength cut filter section capable of cutting light having a wavelength shorter than the first specified wavelength (first cutoff wavelength). More specifically, for example, the wavelength cut filter section 21G is a short wavelength cut filter section capable of cutting light with a shorter wavelength than the wavelength range of green light.
- the wavelength cut filter section 21R is a short wavelength cut filter section capable of cutting light having a wavelength shorter than the second specified wavelength (second cutoff wavelength). More specifically, for example, the wavelength cut filter section 21R is a short wavelength cut filter capable of cutting light with wavelengths shorter than the wavelength range of red light.
- the display device 10 may include the bandpass filter 22 as the wavelength correction layer.
- the band-pass filter 22 cuts light in a specified wavelength range of light in the visible range, but transmits light in a visible range other than the specified wavelength range. can be done.
- the bandpass filter 22 may have a film shape.
- Bandpass filter 22 may be a light absorbing material. The transmission characteristics of the bandpass filter 22 are preferably matched to the high luminance side of the spectrum of the light emitting element 12 .
- the bandpass filter 22 may be provided over substantially the entire display area of the display device 10 and shared by the plurality of light emitting elements 12 . In this case, since it is not necessary to form a filter for each sub-pixel 20, the manufacturing process can be simplified. Also, there is no need to precisely align the filters for each sub-pixel 20 .
- the display device 10 may include a protective layer 17 as shown in FIG. In this case, the display device 10 may have a bandpass filter 22 on the first surface of the protective layer 17 .
- the display device 10 may further include a light blocking portion 13BM on the first surface of the bandpass filter 22 .
- the green light emitting element 12G is configured to generate an emission wavelength shift due to changes in current density, and a wavelength correction section such as a green filter section 13G is provided on or above the light emitting element 12G.
- a wavelength correction section such as a green filter section 13G is provided on or above the light emitting element 12G.
- the red light emitting element 12R may be configured to generate an emission wavelength shift due to changes in current density, and a wavelength correction section such as a red filter section may be provided on or above the light emitting element 12R.
- the blue light-emitting element 12B may be configured to generate an emission wavelength shift in accordance with changes in current density, and a wavelength correction section such as a blue filter section may be provided on or above the light-emitting element 12B.
- the two or more sub-pixels 20 forming the pixel 20P may include the light-emitting element 12 and the wavelength corrector configured to generate an emission wavelength shift associated with a change in current density.
- the green light emitting element 15G is configured to generate an emission wavelength shift due to a change in current density, and the green light contained in the light wavelength-shifted due to a change in current density of the light emitting element 15G
- an example see FIG. 6 having a resonator structure capable of resonating and enhancing light has been described, the disclosure is not so limited.
- the red light emitting element 12R is configured to generate an emission wavelength shift with current density change, and resonates and emphasizes the red light contained in the light wavelength-shifted with the current density change of the light emitting element 12R. It may have a resonator structure that can For example, when the light emitting element 12R is a GaN-based compound semiconductor light emitting element, the emission spectrum of the light emitting element 12R shifts to the short wavelength side as the current density increases.
- the blue light emitting element 12B is configured to generate an emission wavelength shift with current density change, and resonates and emphasizes the blue light contained in the light wavelength-shifted with the current density change of the light emitting element 12B. It may have a resonator structure that can
- Two or more sub-pixels 20 constituting the pixel 20P are configured to generate an emission wavelength shift with current density change, and the definition included in the wavelength-shifted light with current density change of the light emitting element 12 It may have a resonator structure capable of resonating and enhancing colored light.
- the present disclosure can also employ the following configuration.
- a substrate having a current amplitude modulation type drive circuit a plurality of first light emitting elements and a plurality of second light emitting elements two-dimensionally arranged on the substrate; a wavelength correction layer capable of correcting wavelengths of light emitted from the plurality of first light emitting elements,
- the display device, wherein the drive circuit can independently gamma-correct a first signal supplied to the first light emitting element and a second signal supplied to the second light emitting element.
- the first light emitting element is configured to generate an emission wavelength shift in accordance with a change in current density.
- the display device (3) The display device according to (1) or (2), wherein the drive circuit is capable of controlling luminance of the first light emitting element so as to compensate for luminance reduction due to the wavelength correction layer.
- the wavelength correction layer is provided only on or above the plurality of first light emitting elements.
- the plurality of first light emitting elements include first compound semiconductor light emitting elements capable of emitting green light.
- the plurality of second compound semiconductor light emitting elements include a plurality of second compound semiconductor light emitting elements capable of emitting red light and a plurality of third compound semiconductor light emitting elements capable of emitting blue light ( 5) The display device according to the above.
- the plurality of first light emitting elements may include a first compound semiconductor light emitting element capable of emitting green light, a second compound semiconductor light emitting element capable of emitting red light, and a blue light emitting element.
- the plurality of second light emitting elements include light emitting elements other than the one or two light emitting elements.
- any one of (1) to (9), wherein the peak wavelength of the first light-emitting element under weak excitation is closer to the center wavelength of the wavelength correction layer than the peak wavelength of the first light-emitting element under strong excitation; 2.
- the display device according to item 1. (11) The display device according to any one of (1) to (10), wherein the wavelength correction layer is a color filter. (12) The display device according to any one of (1) to (9), wherein the wavelength correction layer is a wavelength cut filter. (13) The display device according to any one of (1) to (9), wherein the wavelength correction layer is a color conversion layer. (14) The display device according to any one of (1) to (10), wherein the wavelength correction layer is a bandpass filter.
- the wavelength correction layer is provided on or above the plurality of first light emitting elements and the plurality of second light emitting elements, The display device according to any one of (1) to (10), wherein the wavelength correction layer blocks light in a partial wavelength range of the first light emitting element and transmits light in other wavelength ranges. .
- a first sub-pixel is configured by the first light-emitting element and the wavelength correction layer
- a second sub-pixel is configured by the second light-emitting element
- the display device according to any one of (1) to (15), wherein the area of the first sub-pixel is larger than the area of the second sub-pixel.
- the wavelength correction layer includes a plurality of wavelength correction parts and a light shielding part, Each wavelength correction unit is provided on or above the first light emitting element,
- the display device according to any one of (1) to (16), wherein the light shielding section is provided around or on the wavelength correction section.
- the first light emitting element has a resonator structure capable of correcting light emitted from the first light emitting element,
- the display device, wherein the drive circuit can independently gamma-correct a first signal supplied to the first light emitting element and a second signal supplied to the second light emitting element.
- the first light emitting element is configured to generate an emission wavelength shift with a change in current density
- the display device according to (18) wherein the resonator structure can resonate and emphasize a prescribed color light contained in the light wavelength-shifted according to the current density change of the first light emitting element.
- An electronic device comprising the display device according to any one of (1) to (19).
- the display device 10 according to the above embodiment and its modification may be provided in various electronic devices.
- 24A is a front view showing an example of the appearance of the digital still camera 310.
- FIG. 24B is a rear view showing an example of the appearance of the digital still camera 310.
- This digital still camera 310 is of an interchangeable single-lens reflex type, and has an interchangeable photographing lens unit (interchangeable lens) 312 in approximately the center of the front of a camera main body (camera body) 311, and on the left side of the front. It has a grip portion 313 for a photographer to hold.
- interchangeable photographing lens unit interchangeable lens
- a monitor 314 is provided at a position shifted to the left from the center of the back surface of the camera body 311 .
- An electronic viewfinder (eyepiece window) 315 is provided above the monitor 314 . By looking through the electronic viewfinder 315, the photographer can view the optical image of the subject guided from the photographing lens unit 312 and determine the composition.
- Electronic viewfinder 315 includes display device 10 .
- FIG. 25 is a perspective view showing an example of the appearance of the head mounted display 320.
- the head-mounted display 320 has, for example, ear hooks 322 on both sides of an eyeglass-shaped display 321 to be worn on the user's head.
- the display unit 321 includes the display device 10 .
- FIG. 26 is a perspective view showing an example of the appearance of the television device 330.
- the television apparatus 330 has an image display screen portion 331 including, for example, a front panel 332 and a filter glass 333 , and the image display screen portion 331 includes the display device 10 .
- Light emitting element array 37 Image data 120R, 120G, 120B Compound semiconductor laminate 121R, 121G, 121B First electrode 122R, 122G, 122B Second electrode 123R , 123G, 123B First compound semiconductor layer 124R, 124G, 124B Light emitting layer 125R, 125G, 125B Second compound semiconductor layer 310 Digital
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Abstract
Description
電流振幅変調方式の駆動回路を有する基板と、
基板上に2次元配置された複数の第1の発光素子および複数の第2の発光素子と、
複数の第1の発光素子から出射された光の波長を補正することができる波長補正層と
を備え、
駆動回路は、第1の発光素子に供給される第1の信号と第2の発光素子に供給される第2の信号とを独立してガンマ補正することができる。
電流振幅変調方式の駆動回路を有する基板と、
基板上に2次元配置された複数の第1の発光素子および複数の第2の発光素子と
を備え、
第1の発光素子は、該第1の発光素子から出射される光を補正することができる共振器構造を有し、
駆動回路は、第1の発光素子に供給される第1の信号と第2の発光素子に供給される第2の信号とを独立してガンマ補正することができる。
本開示において、波長補正層は、複数の波長補正部を備え、各波長補正部は、第1の発光素子上または上方に設けられてもよい。波長補正部は、カラーフィルタ部、バンドパスフィルタ部、波長カットフィルタ部および色変換部からなる群より選ばれた少なくとも1種を含んでもよい。
本開示において、波長補正層は、波長補正部の周囲または波長補正部上に遮光部を備えてもよい。
本開示において、波長補正層は複数の開口を有し、各開口は第2の発光素子上または上方に設けられてもよい。
本開示において、複数の第1の発光素子が、緑色光を発光することができる第1の化合物半導体発光素子を含み、複数の第2の発光素子が、赤色光を発光することができる第2の化合物半導体発光素子、および青色光を発光することができる第3の化合物半導体発光素子を含んでもよい。
本開示において、複数の第1の発光素子が、青色光を発光することができる第1の化合物半導体発光素子を含み、複数の第2の発光素子が、赤色光を発光することができる第2の化合物半導体発光素子、および緑色光を発光することができる第3の化合物半導体発光素子を含んでもよい。
本開示において、複数の第1の発光素子が、赤色光を発光することができる第1の化合物半導体発光素子、および青色光を発光することができる第2の化合物半導体発光素子を含み、複数の第2の発光素子が、緑色光を発光することができる第3の化合物半導体発光素子を含んでもよい。
本開示において、複数の第1の発光素子が、緑色光を発光することができる第1の化合物半導体発光素子、および青色光を発光することができる第2の化合物半導体発光素子を含み、複数の第2の発光素子が、赤色光を発光することができる第3の化合物半導体発光素子を含んでもよい。
1 一実施形態(表示装置の例)
2 変形例(表示装置の変形例)
3 応用例(電子機器の例)
[表示装置10の構成]
図1は、一実施形態に係る表示装置10の構成の一例を示す平面図である。図2は、図1のII-II線に沿った断面図である。表示装置10は、回路基板11と、複数の画素20Pとを備える。表示装置100は、例えば、LED表示装置である。表示装置100は、発光デバイスの一例である。
回路基板11は、いわゆるバックプレーンである。回路基板11は、複数の画素20Pを駆動する。回路基板11の第1の面には、配線11aおよび図4に示された駆動回路30等が設けられている。
複数の画素20Pは、規定の配置パターンで回路基板11の第1の面に2次元配置されている。画素20Pは、赤色サブ画素20Rと、緑色サブ画素20Gと、青色サブ画素20Bとにより構成されている。赤色サブ画素20Rは、第1のサブ画素の一例である。緑色サブ画素20Gおよび青色サブ画素20Bは、第2のサブ画素の一例である。赤色サブ画素20R、緑色サブ画素20Gおよび青色サブ画素20Bの第1電極は、バンプまたはビア等の接続部材12mにより回路基板11上の配線(図示せず)に接続されている。赤色サブ画素20R、緑色サブ画素20Gおよび青色サブ画素20Bの第2電極は、バンプまたはビア等の接続部材12nにより回路基板11上の配線11aに接続されている。
発光素子12Gは、緑色光を発光することができる。発光素子12Gは、発光素子12Gの電流密度変化に伴って発光波長シフトを発生するように構成されている。発光素子12Gの発光スペクトルは、図20に示すように、電流密度の増加に伴って短波長側にシフトしてもよい。例えば、発光素子12GがGaN系化合物半導体発光素子である場合、発光素子12Gの発光スペクトルは、電流密度の増加に伴って短波長側にシフトする。
発光素子12Rは、赤色光を発光することができる。発光素子12Rは、例えば、赤色LED素子である。発光素子12Rは、図3に示すように、化合物半導体積層体120Rと、第1の電極121Rと、第2の電極122Rとを備える。化合物半導体積層体120Rは、第1の化合物半導体層123Rと、発光層124Rと、第2の化合物半導体層125Rとを順に備える。
発光素子12Bは、青色光を発光することができる。発光素子12Bは、例えば、青色LED素子である。発光素子12Bは、図3に示すように、化合物半導体積層体120Bと、第1の電極121Bと、第2の電極122Bとを備える。化合物半導体積層体120Bは、第1の化合物半導体層123Bと、発光層124Bと、第2の化合物半導体層125Bとを順に備える。
カラーフィルタ13は、波長補正層の一例である。カラーフィルタ13は、遮光部13BMと、複数の緑色フィルタ部13Gとを備える。
図4は、一実施形態に係る表示装置10に備えられた駆動回路30の構成の一例を示すブロック図である。駆動回路30は、画像データ入力インターフェール(以下「データ入力I/F」という。)31と、タイミングコントローラ32と、ガンマ補正回路33Aと、ガンマ補正回路33Bと、水平走査ドライバ34と、垂直走査ドライバ35とを備える。
一実施形態に係る表示装置10では、電流振幅変調方式の駆動回路30を有する回路基板11と、回路基板11の第1の面上に2次元配置された複数の発光素子12R、12G、12Bと、複数の発光素子12Gから出射された光(発光素子12Gの電流密度変化に伴って波長シフトされた光)の波長を補正することができるカラーフィルタ(波長補正層)13とを備える。駆動回路30は、発光素子(第1の発光素子)12Gに供給される映像信号(第1の信号)SGと、発光素子(第2の発光素子)12R、12Bにそれぞれ供給される映像信号(第2の信号)SR、SBとを独立してガンマ補正することができるガンマ補正回路33A、33Bを備える。
一方、一実施形態に係る表示装置10は、電流振幅変調方式により駆動されるため、パルス幅変調駆動により駆動される表示装置に比べて、回路規模を小さくすることができる。したがって、製造コストを低減することができる。
一実施形態に係る表示装置10では、緑色の発光素子12Gとして、波長シフトが抑制された特殊で高価なLED素子を用いるのではなく、汎用のGaN系LED素子等を用いることができる。したがって、表示装置10の製造コストの上昇を抑制しつつ、色ズレの発生による画品位の低下を抑制することができる。
一方、一実施形態に係る表示装置10では、緑色の発光素子12Gの上方にのみカラーフィルタ(緑色フィルタ部13G)を備える構成であるため、表示装置10の構造を簡素化することができる。よって、表示装置10を高精細化が容易である。
一方、一実施形態に係る表示装置10は、カラーフィルタ13は緑色フィルタ部13Gのみを備えているので、青色フィルタ部の光劣化を考慮せずに、緑色フィルタ部13Gの材料を選択することができる。したがって、緑色フィルタ部13Gの材料選択の自由度が高くなる。よって、表示装置10の製造コストを低減することができる。
一実施形態に係る表示装置10では、赤色サブ画素20Rおよび青色サブ画素20Bにはフィルタ部が備えられていないため、カラーフィルタによる赤色サブ画素20Rおよび青色サブ画素20Bの輝度低下を防ぐことができる。
(変形例1)
上記一実施形態では、表示装置10が、波長補正層としてカラーフィルタ13を備える例について説明したが、波長補正層はカラーフィルタ13に限定されるものではない。
上記一実施形態では、赤色サブ画素20R、緑色サブ画素20Gおよび青色サブ画素20Bの面積が同一である例について説明したが、図8に示すように、緑色サブ画素20Gの面積が、赤色サブ画素20Rおよび青色サブ画素20Bの面積より大きくてもよい。これにより、カラーフィルタ13による緑色サブ画素20Gの輝度低下を抑制することができる。例えば、緑色サブ画素20Gの面積が、赤色サブ画素20Rまたは青色サブ画素20Bの面積の約2倍であってもよい。
上記一実施形態では、画素20Pが、1つの赤色サブ画素20R、1つの緑色サブ画素20Gおよび1つの青色サブ画素20Bにより構成されている例について説明したが、画素20Pが、図10、図11A、図11Bに示すように、1つの赤色サブ画素20R、2つの緑色サブ画素20Gおよび1つの青色サブ画素20Bにより構成されてもよい。図11A、図11Bに示すように、カラーフィルタ13が複数の発光素子12上に隣接して設けられてもよい。この場合、発光素子12Rおよび発光素子12Bの出射光が緑色フィルタ部13Gに入射することを抑制することができるので、混色を抑制することができる。
表示装置10が、図12に示すように、回路基板11の第1の面上に保護層17を備えてもよい。複数の発光素子12は、保護層17内に設けられている。保護層17は、複数の発光素子12を外気と遮断し、外部環境から発光素子12内部への水分浸入を抑制することができる。保護層17は、絶縁性を有し、かつ、可視光に対して透明性を有する。本明細書において、可視光とは、360nm以上830nmの波長域の光をいう。
上記一実施形態では、緑色フィルタ部13Gが、発光素子12Gの第1の面の上方に設けられている例について説明したが、緑色フィルタ部13Gが、図14に示すように、発光素子12Gの第1の面上に直接設けられてもよい。
表示装置10は、図15に示すように、回路基板11の第1の面に対向する対向基板18を備えてもよい。この場合、対向基板18が、回路基板11に対向する第2の面にカラーフィルタ13を備えてもよい。図15では、カラーフィルタ13が遮光部13BM(図2参照)を備えていない例が示されているが、カラーフィルタ13が遮光部13BMを備えてもよい。対向基板18は、可視光に対して透明性を有している。対向基板18は、例えば、ガラスまたは高分子樹脂を含む。
上記一実施形態では、表示装置10が、発光素子12から出射された光が回路基板11とは反対側から取り出されるトップエミッション方式の構造を有する例(図2参照)について説明したが、表示装置10が、図16に示すように、発光素子12から出射された光が回路基板19側から取り出されるボトムエミッション方式の構造を有してもよい。この場合、回路基板19は、可視光に対して透明性を有している。カラーフィルタ13が回路基板19の第1の面に備えられてもよい。図16では、カラーフィルタ13が遮光部13BM(図2参照)を備えていない例が示されているが、カラーフィルタ13が遮光部13BMを備えてもよい。
上記一実施形態では、遮光部13BMが、緑色フィルタ部13Gを取り囲むように緑色フィルタ部13Gの周囲に設けられている例について説明したが、遮光部13BMが、図17に示すように、緑色フィルタ部13Gの周りに設けられないようにしてもよい。
上記一実施形態では、遮光部13BMと緑色フィルタ部13Gとが同一層内に設けられている例について説明したが、図18に示すように、緑色フィルタ部13G上に遮光部13BMが設けられてもよい。この場合、緑色フィルタ部13Gは、複数の開口13GHを有する層であってもよい。開口13GHは、表示装置10の厚さ方向に貫通している。複数の開口13GHのうち一部はそれぞれ、発光素子12Rの上方に設けられ、複数の開口13GHのうち残りはそれぞれ、発光素子12Bの上方に設けられる。
上記一実施形態では、表示装置10が波長補正層としてカラーフィルタ13を備える例について説明したが、図21に示すように、表示装置10が波長補正層として波長カットフィルタ21を備えてもよい。波長カットフィルタ21は、波長カットフィルタ部21Gと、遮光部13BMとを備えてもよい。
上記一実施形態では、表示装置10が波長補正層としてカラーフィルタ13を備える例について説明したが、図22に示すように、表示装置10が波長補正層としてバンドパスフィルタ22を備えてもよい。バンドパスフィルタ22は、図23に示すように、可視域の光のうち規定の波長域の光をカットするのに対して、可視域の光のうち規定の波長域以外の光を透過することができる。バンドパスフィルタ22は、フィルム状を有してもよい。バンドパスフィルタ22は、光吸収素材であってもよい。バンドパスフィルタ22の透過特性は、発光素子12のスペクトルの高輝度側に合わせることが好ましい。バンドパスフィルタ22は、表示装置10の表示領域の略全体に亘って設けられ、複数の発光素子12により共有されてもよい。この場合、サブ画素20ごとにフィルタを形成しなくてもよいため、製造工程を簡素化することができる。また、サブ画素20ごとにフィルタを高精度に位置合わせする必要もない。
上記一実施形態および変形例では、緑色の発光素子12Gが電流密度変化に伴う発光波長シフトを発生するように構成され、緑色フィルタ部13G等の波長補正部が発光素子12G上または上方に備えられている例について説明したが、本開示はこれに限定されるものではない。
上記変形例1では、緑色の発光素子15Gが、電流密度変化に伴う発光波長シフトを発生するように構成され、かつ、発光素子15Gの電流密度変化に伴って波長シフトされた光に含まれる緑色光を共振させ強調することができる共振器構造を有する例(図6参照)について説明したが、本開示はこれに限定されるものではない。
以上、本開示の一実施形態およびその変形例について具体的に説明したが、本開示は、上記の一実施形態およびその変形例に限定されるものではなく、本開示の技術的思想に基づく各種の変形が可能である。
(1)
電流振幅変調方式の駆動回路を有する基板と、
前記基板上に2次元配置された複数の第1の発光素子および複数の第2の発光素子と、
複数の前記第1の発光素子から出射された光の波長を補正することができる波長補正層と
を備え、
前記駆動回路は、前記第1の発光素子に供給される第1の信号と前記第2の発光素子に供給される第2の信号とを独立してガンマ補正することができる表示装置。
(2)
前記第1の発光素子は、電流密度変化に伴って発光波長シフトを発生するように構成されている(1)に記載の表示装置。
(3)
前記駆動回路は、前記波長補正層による輝度低下を補うように、前記第1の発光素子の輝度制御を行うことができる(1)または(2)に記載の表示装置。
(4)
前記波長補正層は、複数の前記第1の発光素子上または上方のみに設けられている(1)から(3)のいずれか1項に記載の表示装置。
(5)
複数の前記第1の発光素子が、緑色光を発光することができる第1の化合物半導体発光素子を含む(1)から(4)のいずれか1項に記載の表示装置。
(6)
複数の前記第2の発光素子が、赤色光を発光することができる複数の第2の化合物半導体発光素子と、青色光を発光することができる複数の第3の化合物半導体発光素子とを含む(5)に記載の表示装置。
(7)
複数の前記第1の発光素子が、緑色光を発光することができる第1の化合物半導体発光素子、赤色光を発光することができる第2の化合物半導体発光素子、および青色光を発光することができる第3の化合物半導体発光素子からなる群より選ばれた1種または2種の発光素子を含む(1)から(4)のいずれか1項に記載の表示装置。
(8)
複数の前記第2の発光素子が、前記1種または2種の発光素子以外の発光素子を含む(7)に記載の表示装置。
(9)
前記第1の発光素子が、GaN系化合物半導体発光素子である(1)から(8)のいずれか1項に記載の表示装置。
(10)
前記第1の発光素子の弱励起時のピーク波長が、前記第1の発光素子の強励起時のピーク波長よりも、前記波長補正層の中心波長に近い(1)から(9)のいずれか1項に記載の表示装置。
(11)
前記波長補正層が、カラーフィルタである(1)から(10)のいずれか1項に記載の表示装置。
(12)
前記波長補正層が、波長カットフィルタである(1)から(9)のいずれか1項に記載の表示装置。
(13)
前記波長補正層が、色変換層である(1)から(9)のいずれか1項に記載の表示装置。
(14)
前記波長補正層が、バンドパスフィルタである(1)から(10)のいずれか1項に記載の表示装置。
(15)
前記波長補正層は、複数の前記第1の発光素子および複数の前記第2の発光素子上または上方に設けられ、
前記波長補正層は、前記第1の発光素子の一部の波長域の光を遮光し、他の波長域の光を透過する(1)から(10)のいずれか1項に記載の表示装置。
(16)
前記第1の発光素子と前記波長補正層とにより第1のサブ画素が構成され、
前記第2の発光素子により第2のサブ画素が構成され、
前記第1のサブ画素の面積は、前記第2のサブ画素の面積よりも大きい(1)から(15)のいずれか1項に記載の表示装置。
(17)
前記波長補正層は、複数の波長補正部と遮光部とを備え、
各前記波長補正部は、前記第1の発光素子上または上方に設けられ、
前記遮光部は、前記波長補正部の周囲または前記波長補正部上に設けられている(1)から(16)のいずれか1項に記載の表示装置。
(18)
電流振幅変調方式の駆動回路を有する基板と、
前記基板上に2次元配置された複数の第1の発光素子および複数の第2の発光素子と
を備え、
前記第1の発光素子は、該第1の発光素子から出射される光を補正することができる共振器構造を有し、
前記駆動回路は、前記第1の発光素子に供給される第1の信号と前記第2の発光素子に供給される第2の信号とを独立してガンマ補正することができる表示装置。
(19)
前記第1の発光素子は、電流密度変化に伴って発光波長シフトを発生するように構成され、
前記共振器構造は、前記第1の発光素子の電流密度変化に伴って波長シフトされた光に含まれる規定色の光を共振させ強調することができる(18)に記載の表示装置。
(20)
(1)から(19)のいずれか1項に記載の表示装置を備える電子機器。
(電子機器)
上記の一実施形態およびその変形例に係る表示装置10は、種々の電子機器に備えられてもよい。特にビデオカメラや一眼レフカメラの電子ビューファインダまたはヘッドマウント型ディスプレイ等の高解像度が要求され、目の近くで拡大して使用されるものに備えられることが好ましい。
図24Aは、デジタルスチルカメラ310の外観の一例を示す正面図である。図24Bは、デジタルスチルカメラ310の外観の一例を示す背面図である。このデジタルスチルカメラ310は、レンズ交換式一眼レフレックスタイプのものであり、カメラ本体部(カメラボディ)311の正面略中央に交換式の撮影レンズユニット(交換レンズ)312を有し、正面左側に撮影者が把持するためのグリップ部313を有している。
図25は、ヘッドマウントディスプレイ320の外観の一例を示す斜視図である。ヘッドマウントディスプレイ320は、例えば、眼鏡形の表示部321の両側に、使用者の頭部に装着するための耳掛け部322を有している。表示部321は、表示装置10を備える。
図26は、テレビジョン装置330の外観の一例を示す斜視図である。このテレビジョン装置330は、例えば、フロントパネル332およびフィルターガラス333を含む映像表示画面部331を有しており、この映像表示画面部331は、表示装置10を備える。
11、19 回路基板
12R、12G、12B、12UV、15G 化合物半導体発光素子
12m、12n 接続部材
13 カラーフィルタ
13H、13GH 開口
13BM 遮光部
13G 緑色フィルタ部
14G、16G 色変換層
17 保護層
18 対向基板
20P 画素
20R 赤色サブ画素
20G 緑色サブ画素
20B 青色サブ画素
21 波長カットフィルタ
21R、21G 波長カットフィルタ部
22 バンドパスフィルタ
30 駆動回路
31 画像データ入力インターフェール
32 タイミングコントローラ
32A 画像処理部
32B 輝度制御部
33A、33B ガンマ補正回路
34 水平走査ドライバ
35 垂直走査ドライバ
36 発光素子アレイ
37 画像データ
120R、120G、120B 化合物半導体積層体
121R、121G、121B 第1の電極
122R、122G、122B 第2の電極
123R、123G、123B 第1の化合物半導体層
124R、124G、124B 発光層
125R、125G、125B 第2の化合物半導体層
310 デジタルスチルカメラ(電子機器)
320 ヘッドマウントディスプレイ(電子機器)
330 テレビジョン装置(電子機器)
Claims (20)
- 電流振幅変調方式の駆動回路を有する基板と、
前記基板上に2次元配置された複数の第1の発光素子および複数の第2の発光素子と、
複数の前記第1の発光素子から出射された光の波長を補正することができる波長補正層と
を備え、
前記駆動回路は、前記第1の発光素子に供給される第1の信号と前記第2の発光素子に供給される第2の信号とを独立してガンマ補正することができる表示装置。 - 前記第1の発光素子は、電流密度変化に伴って発光波長シフトを発生するように構成されている請求項1に記載の表示装置。
- 前記駆動回路は、前記波長補正層による輝度低下を補うように、前記第1の発光素子の輝度制御を行うことができる請求項1に記載の表示装置。
- 前記波長補正層は、複数の前記第1の発光素子上または上方のみに設けられている請求項1に記載の表示装置。
- 複数の前記第1の発光素子が、緑色光を発光することができる第1の化合物半導体発光素子を含む請求項1に記載の表示装置。
- 複数の前記第2の発光素子が、赤色光を発光することができる第2の化合物半導体発光素子と、青色光を発光することができる第3の化合物半導体発光素子とを含む請求項5に記載の表示装置。
- 複数の前記第1の発光素子が、緑色光を発光することができる第1の化合物半導体発光素子、赤色光を発光することができる第2の化合物半導体発光素子、および青色光を発光することができる第3の化合物半導体発光素子からなる群より選ばれた1種または2種の発光素子を含む請求項1に記載の表示装置。
- 複数の前記第2の発光素子が、前記1種または2種の発光素子以外の発光素子を含む請求項7に記載の表示装置。
- 前記第1の発光素子が、GaN系化合物半導体発光素子である請求項1に記載の表示装置。
- 前記第1の発光素子の弱励起時のピーク波長が、前記第1の発光素子の強励起時のピーク波長よりも、前記波長補正層の中心波長に近い請求項1に記載の表示装置。
- 前記波長補正層が、カラーフィルタである請求項1に記載の表示装置。
- 前記波長補正層が、波長カットフィルタである請求項1に記載の表示装置。
- 前記波長補正層が、色変換層である請求項1に記載の表示装置。
- 前記波長補正層が、バンドパスフィルタである請求項1に記載の表示装置。
- 前記波長補正層は、複数の前記第1の発光素子および複数の前記第2の発光素子上または上方に設けられ、
前記波長補正層は、前記第1の発光素子の一部の波長域の光を遮光し、他の波長域の光を透過する請求項1に記載の表示装置。 - 前記第1の発光素子と前記波長補正層とにより第1のサブ画素が構成され、
前記第2の発光素子により第2のサブ画素が構成され、
前記第1のサブ画素の面積は、前記第2のサブ画素の面積よりも大きい請求項1に記載の表示装置。 - 前記波長補正層は、複数の波長補正部と遮光部とを備え、
各前記波長補正部は、前記第1の発光素子上または上方に設けられ、
前記遮光部は、前記波長補正部の周囲または前記波長補正部上に設けられている請求項1に記載の表示装置。 - 電流振幅変調方式の駆動回路を有する基板と、
前記基板上に2次元配置された複数の第1の発光素子および複数の第2の発光素子と
を備え、
前記第1の発光素子は、該第1の発光素子から出射される光を補正することができる共振器構造を有し、
前記駆動回路は、前記第1の発光素子に供給される第1の信号と前記第2の発光素子に供給される第2の信号とを独立してガンマ補正することができる表示装置。 - 前記第1の発光素子は、電流密度変化に伴って発光波長シフトを発生するように構成され、
前記共振器構造は、前記第1の発光素子の電流密度変化に伴って波長シフトされた光に含まれる規定色の光を共振させ強調することができる請求項18に記載の表示装置。 - 請求項1に記載の表示装置を備える電子機器。
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