WO2019220246A1 - 表示装置、表示モジュール、電子機器、及び、表示装置の作製方法 - Google Patents
表示装置、表示モジュール、電子機器、及び、表示装置の作製方法 Download PDFInfo
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- WO2019220246A1 WO2019220246A1 PCT/IB2019/053436 IB2019053436W WO2019220246A1 WO 2019220246 A1 WO2019220246 A1 WO 2019220246A1 IB 2019053436 W IB2019053436 W IB 2019053436W WO 2019220246 A1 WO2019220246 A1 WO 2019220246A1
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- H01L27/124—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs with a particular composition, shape or layout of the wiring layers specially adapted to the circuit arrangement, e.g. scanning lines in LCD pixel circuits
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
- H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body
- H01L27/1214—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
- H01L27/1259—Multistep manufacturing methods
- H01L27/1262—Multistep manufacturing methods with a particular formation, treatment or coating of the substrate
- H01L27/1266—Multistep manufacturing methods with a particular formation, treatment or coating of the substrate the substrate on which the devices are formed not being the final device substrate, e.g. using a temporary substrate
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/005—Processes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
- H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body
- H01L27/1214—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
- H01L27/1222—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs with a particular composition, shape or crystalline structure of the active layer
- H01L27/1225—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs with a particular composition, shape or crystalline structure of the active layer with semiconductor materials not belonging to the group IV of the periodic table, e.g. InGaZnO
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2933/00—Details relating to devices covered by the group H01L33/00 but not provided for in its subgroups
- H01L2933/0008—Processes
- H01L2933/0033—Processes relating to semiconductor body packages
- H01L2933/0066—Processes relating to semiconductor body packages relating to arrangements for conducting electric current to or from the semiconductor body
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/44—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the coatings, e.g. passivation layer or anti-reflective coating
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/62—Arrangements for conducting electric current to or from the semiconductor body, e.g. lead-frames, wire-bonds or solder balls
Definitions
- One embodiment of the present invention relates to a display device, a display module, an electronic device, and manufacturing methods thereof.
- one embodiment of the present invention is not limited to the above technical field.
- a semiconductor device e.g., a display device, a light-emitting device, a power storage device, a memory device, an electronic device, a lighting device, an input device (eg, a touch sensor), an input / output device (eg, a touch panel) ), A driving method thereof, or a manufacturing method thereof can be given as an example.
- a display device using a micro light-emitting diode (micro LED (Light Emitting Diode)) as a display element has been proposed (for example, Patent Document 1).
- a display device using a micro LED as a display element has advantages such as high brightness, high contrast, and long life, and research and development are actively conducted as a next-generation display device.
- a display device using a micro LED as a display element has a very long time for mounting an LED chip, and a reduction in manufacturing cost is an issue.
- red (R), green (G), and blue (B) LEDs are produced on different wafers, and the LEDs are cut out one by one and mounted on a circuit board. Therefore, as the number of pixels of the display device increases, the number of LEDs to be mounted increases and the time required for mounting becomes longer. Moreover, the higher the definition of the display device, the higher the difficulty of mounting the LED.
- An object of one embodiment of the present invention is to provide a display device with high definition.
- An object of one embodiment of the present invention is to provide a display device with high display quality.
- An object of one embodiment of the present invention is to reduce the thickness and weight of a display device.
- An object of one embodiment of the present invention is to reduce manufacturing cost of a display device using a micro LED as a display element.
- An object of one embodiment of the present invention is to manufacture a display device using a micro LED as a display element with high yield.
- the display device of one embodiment of the present invention includes a substrate, a plurality of transistors, and a plurality of light-emitting diodes.
- the plurality of light emitting diodes are provided in a matrix on the substrate.
- Each of the plurality of transistors is electrically connected to at least one of the plurality of light emitting diodes.
- the plurality of light emitting diodes are located closer to the substrate than the plurality of transistors.
- the plurality of light emitting diodes emit light on the side opposite to the substrate.
- At least one of the plurality of light emitting diodes is preferably a micro light emitting diode.
- At least one of the plurality of transistors preferably includes a metal oxide in a channel formation region.
- the plurality of light emitting diodes include a first light emitting diode and a second light emitting diode that exhibit light of different colors.
- the plurality of light emitting diodes preferably exhibit white light.
- At least one of the plurality of transistors preferably includes a semiconductor layer that transmits visible light.
- the semiconductor layer has a channel formation region and a pair of low resistance regions.
- the pair of low resistance regions has lower resistance than the channel formation region. Light emitted from the light emitting diode passes through at least one of the pair of low resistance regions and is emitted to the substrate side.
- One embodiment of the present invention includes a display device having the above structure, a module to which a connector such as a flexible printed circuit board (hereinafter referred to as FPC) or a TCP (Tape Carrier Package) is attached, or a COG A module such as a module in which an integrated circuit (IC) is mounted by a (Chip On Glass) method or a COF (Chip On Film) method.
- a connector such as a flexible printed circuit board (hereinafter referred to as FPC) or a TCP (Tape Carrier Package) is attached
- a COG A module such as a module in which an integrated circuit (IC) is mounted by a (Chip On Glass) method or a COF (Chip On Film) method.
- One embodiment of the present invention is an electronic device including the above module and at least one of an antenna, a battery, a housing, a camera, a speaker, a microphone, and an operation button.
- a plurality of transistors are formed in a matrix over a first substrate, a plurality of light-emitting diodes are formed in a matrix over the second substrate, and the first substrate or the second substrate A first conductor that is electrically connected to at least one of the plurality of transistors or at least one of the plurality of light emitting diodes is formed over the substrate, and at least one of the plurality of transistors is interposed through the first conductor. And a first substrate and a second substrate are bonded to each other so that at least one of the plurality of light emitting diodes is electrically connected.
- the first conductor and at least one of the plurality of transistors are electrically connected, and at least one of the plurality of light-emitting diodes is formed on the second substrate.
- a second conductor that is electrically connected to one is formed, and the first substrate and the second substrate are preferably bonded to each other so that the first conductor and the second conductor are in contact with each other.
- the first substrate After bonding the first substrate and the second substrate, the first substrate may be peeled off.
- a peeling layer is formed over a first substrate, an insulating layer is formed over the peeling layer, a part of the insulating layer is opened, and a plurality of transistors are matrixed over the insulating layer.
- the conductive layer is formed over the release layer so as to overlap with the opening of the insulating layer, the plurality of transistors are sealed, the first substrate is peeled off using the release layer, and the release layer side The conductive layer is exposed, a plurality of light emitting diodes are formed in a matrix on the second substrate, and at least one of the plurality of transistors and at least one of the plurality of light emitting diodes are electrically connected through the conductive layer.
- the plurality of transistors are transferred onto the second substrate, and the conductive layer is electrically connected to at least one of the plurality of transistors, or functions as at least one source or drain of the plurality of transistors. It is a method for manufacturing a display device.
- a peeling layer is formed over a first substrate, an insulating layer is formed over the peeling layer, a part of the insulating layer is opened, and a plurality of transistors are matrixed over the insulating layer.
- the semiconductor layers of the plurality of transistors each have a channel formation region and a pair of low-resistance regions, and the channel formation region is formed over the insulating layer.
- One of the pair of low resistance regions is formed on the release layer so as to overlap with the opening of the insulating layer, and the first substrate is peeled off using the release layer, and one of the pair of low resistance regions is removed from the release layer side.
- a plurality of light emitting diodes are formed in a matrix on the second substrate so that at least one of the plurality of transistors and at least one of the plurality of light emitting diodes are electrically connected to each other through one of the pair of low resistance regions. Connected to the second base Reproduction a plurality of transistors on a method for manufacturing a display device.
- a display device with high definition can be provided. According to one embodiment of the present invention, a display device with high display quality can be provided. According to one embodiment of the present invention, a display device can be reduced in thickness and weight.
- manufacturing cost of a display device using a micro LED as a display element can be reduced.
- a display device using a micro LED as a display element can be manufactured with high yield.
- FIG. 1A is a cross-sectional view illustrating a structure example of a display device.
- FIG. 1B is a cross-sectional view illustrating a configuration example of an LED substrate.
- FIG. 1C is a cross-sectional view illustrating a structure example of a circuit board.
- 2A is a cross-sectional view illustrating a structure example of a display device.
- 2B, 2C, and 2D are cross-sectional views illustrating an example of a method for manufacturing the display device.
- FIG. 3A is a cross-sectional view illustrating a structure example of a display device.
- FIG. 3B is a cross-sectional view illustrating a configuration example of an LED substrate.
- FIG. 3C is a cross-sectional view illustrating a structure example of a circuit board.
- 4A is a cross-sectional view illustrating a structure example of a display device.
- 4B is a cross-sectional view illustrating a structure example of an LED substrate.
- 5A and 5B are cross-sectional views illustrating an example of a method for manufacturing a circuit array.
- FIG. 14 is a cross-sectional view illustrating a structure example of a display device.
- FIG. 14 is a cross-sectional view illustrating a structure example of a display device.
- FIGS. 8A and 8B are cross-sectional views illustrating an example of a transistor.
- FIGS. 9A to 9D each illustrate an example of an electronic device.
- FIGS. 10A to 10E each illustrate an example of an electronic device.
- FIGS. 11A to 11F each illustrate an example of an electronic device.
- film and “layer” can be interchanged with each other depending on circumstances or circumstances.
- conductive layer can be changed to the term “conductive film”.
- insulating film can be changed to the term “insulating layer”.
- the display device in this embodiment includes a plurality of light-emitting diodes that are display elements and transistors that drive the display elements.
- the plurality of light emitting diodes are provided in a matrix on the substrate.
- Each of the plurality of transistors is electrically connected to at least one of the plurality of light emitting diodes.
- the plurality of light emitting diodes are located closer to the substrate than the plurality of transistors.
- the plurality of light emitting diodes emit light on the side opposite to the substrate.
- the display device in this embodiment is formed by bonding a plurality of transistors and a plurality of light-emitting diodes which are formed over different substrates.
- a plurality of light-emitting diodes and a plurality of transistors are bonded together, so that even when a display device with a large number of pixels or a high-definition display device is manufactured, light emission can be performed.
- the manufacturing time of the display device can be shortened, and the manufacturing difficulty can be reduced.
- the display device in this embodiment has a function of displaying an image using a light-emitting diode.
- a micro LED is used as a light emitting diode
- a micro LED having a double heterojunction will be described.
- the light emitting diode is not particularly limited, and for example, a micro LED having a quantum well junction, an LED using a nanocolumn, or the like may be used.
- the micro LED as the display element
- the power consumption of the display device can be reduced.
- the display device can be reduced in thickness and weight.
- a display device using a micro LED as a display element has high contrast and a wide viewing angle, so that display quality can be improved.
- Area of the region that emits light emitting diode is preferably 1 mm 2 or less, more preferably 10000 2 or less, more preferably 3000 .mu.m 2 or less, more preferably 700 .mu.m 2 or less. Note that in this specification and the like, a light-emitting diode having an area where light is emitted having an area of 10,000 ⁇ m 2 or less may be referred to as a micro LED.
- the transistor included in the display device preferably includes a metal oxide in a channel formation region.
- a transistor using a metal oxide can reduce power consumption. Therefore, a display device with extremely reduced power consumption can be realized by combining with a micro LED.
- FIG. 3 A cross-sectional view of the display device 380A is shown in FIG.
- the display device 380A is configured by bonding a circuit board 360A and an LED board 370A.
- FIG. 1B shows a cross-sectional view of the LED substrate 370A.
- the LED substrate 370A includes a substrate 371, a light emitting diode 302a, a light emitting diode 302b, a conductor 117a, a conductor 117b, a conductor 117c, a conductor 117d, and a protective layer 373.
- the light emitting diode 302a includes an electrode 112a, a semiconductor layer 113a, a light emitting layer 114a, a semiconductor layer 115a, and an electrode 116a.
- the light emitting diode 302b includes an electrode 112b, a semiconductor layer 113b, a light emitting layer 114b, a semiconductor layer 115b, and an electrode 116b.
- the electrode 112a is electrically connected to the semiconductor layer 113a and the conductor 117b.
- the electrode 116a is electrically connected to the semiconductor layer 115a and the conductor 117a.
- the electrode 112b is electrically connected to the semiconductor layer 113b and the conductor 117d.
- the electrode 116b is electrically connected to the semiconductor layer 115b and the conductor 117c.
- the protective layer 373 is provided so as to cover the substrate 371, the electrodes 112a and 112b, the semiconductor layers 113a and 113b, the light emitting layers 114a and 114b, the semiconductor layers 115a and 115b, and the electrodes 116a and 116b.
- the protective layer 373 covers the side surfaces of the conductors 117a to 117d and has openings that overlap with the upper surfaces of the conductors 117a to 117d. In the openings, the upper surfaces of the conductors 117a to 117d are exposed.
- the light emitting layer 114a is sandwiched between the semiconductor layer 113a and the semiconductor layer 115a.
- the light emitting layer 114b is sandwiched between the semiconductor layer 113b and the semiconductor layer 115b.
- electrons and holes are combined to emit light.
- One of the semiconductor layers 113a and 113b and the semiconductor layers 115a and 115b is an n-type semiconductor layer, and the other is a p-type semiconductor layer.
- the stacked structure including the semiconductor layer 113a, the light-emitting layer 114a, and the semiconductor layer 115a and the stacked structure including the semiconductor layer 113b, the light-emitting layer 114b, and the semiconductor layer 115b each have light such as red, yellow, green, or blue. It is formed to exhibit.
- the two laminated structures preferably exhibit different colors of light. These laminated structures include, for example, gallium / phosphorus compounds, gallium / arsenic compounds, gallium / aluminum / arsenic compounds, aluminum / gallium / indium / phosphorus compounds, gallium nitride, indium / gallium nitride compounds, selenium / zinc compounds, etc. Can be used.
- the stacked structure including the semiconductor layer 113a, the light emitting layer 114a, and the semiconductor layer 115a is formed so as to exhibit light such as red, yellow, green, or blue, thereby forming a colored film such as a color filter.
- the process to do becomes unnecessary. Therefore, the manufacturing cost of the display device can be suppressed.
- two laminated structures may exhibit the same color light. At this time, the light emitted from the light emitting layers 114a and 114b may be extracted to the outside of the display device through the colored film.
- a single crystal substrate such as a sapphire (Al 2 O 3 ) substrate, a silicon carbide (SiC) substrate, a silicon (Si) substrate, or a gallium nitride (GaN) substrate can be used.
- FIG. 1C is a cross-sectional view of the circuit board 360A.
- the circuit board 360A includes a substrate 361, an insulating layer 367, a transistor 303a, a transistor 303b, an insulating layer 314, a conductive layer 111a, a conductive layer 111b, a conductive layer 111c, and a conductive layer 111d.
- the transistors 303a and 303b each include a gate, a gate insulating layer 311, a semiconductor layer, a back gate, a source, and a drain.
- the gate (lower gate) and the semiconductor layer overlap with each other with the gate insulating layer 311 interposed therebetween.
- the back gate (upper gate) and the semiconductor layer overlap with each other with the insulating layer 312 and the insulating layer 313 interposed therebetween.
- the semiconductor layer preferably includes an oxide semiconductor.
- At least one layer of the insulating layer 312, the insulating layer 313, and the insulating layer 314 be formed using a material that does not easily diffuse impurities such as water or hydrogen. It becomes possible to effectively suppress the diffusion of impurities from the outside into the transistor, and the reliability of the display device can be improved.
- the insulating layer 314 functions as a planarization layer.
- the insulating layer 367 functions as a base film.
- the insulating layer 367 is preferably formed using a material that does not easily diffuse impurities such as water or hydrogen.
- the conductor 117a provided on the LED board 370A is connected to the conductive layer 111a provided on the circuit board 360A. Accordingly, the transistor 303a and the light emitting diode 302a can be electrically connected.
- the electrode 116a functions as a pixel electrode of the light emitting diode 302a.
- the conductor 117b provided on the LED board 370A and the conductive layer 111b provided on the circuit board 360A are connected.
- the electrode 112a functions as a common electrode of the light emitting diode 302a.
- the conductor 117c provided on the LED board 370A is connected to the conductive layer 111c provided on the circuit board 360A.
- the transistor 303b and the light emitting diode 302b can be electrically connected.
- the electrode 116b functions as a pixel electrode of the light emitting diode 302b.
- the conductor 117d provided on the LED substrate 370A and the conductive layer 111d provided on the circuit substrate 360A are connected.
- the electrode 112b functions as a common electrode of the light emitting diode 302b.
- the substrate 361, the insulating layer 367, the gate insulating layer 311, the insulating layers 312, 313, and 314, and the protective layer 373 each transmit the light.
- light from a light-emitting diode may be extracted to the substrate 371 side when the substrate 371 transmits visible light.
- a reflective layer that reflects the light from the light emitting diode or a light shielding layer that blocks the light may be provided on the side where the light from the light emitting diode is not extracted.
- a conductive paste such as silver, carbon, or copper, or a bump such as gold or solder can be suitably used.
- a conductive material such as silver, carbon, or copper, or a bump such as gold or solder.
- the electrodes 112a, 112b, 116a, and 116b and the conductive layers 111a to 111d connected to the conductors 117a to 117d it is preferable to use a conductive material having low contact resistance with the conductors 117a to 117d, respectively.
- the conductive material connected thereto is aluminum, titanium, copper, an alloy of silver (Ag), palladium (Pd), and copper (Cu) (Ag—Pd— Cu (APC)) or the like is preferable because of low contact resistance.
- the conductors 117a to 117d may be provided on the circuit board 360A instead of the LED board 370A.
- a display device 380B illustrated in FIG. 2A is different from the display device 380A in that it does not include the substrate 361 but includes the flexible substrate 362 and the adhesive layer 363.
- a transistor with high electrical characteristics and high reliability can be formed. Then, by peeling the transistor from the substrate and transferring it to a flexible substrate such as a film, the display device can be reduced in thickness and weight.
- a method for manufacturing the display device 380B is described with reference to FIGS.
- a separation layer 353 is formed over the substrate 351, and an insulating layer 367 is formed over the separation layer 353. Then, the transistor 303a, the insulating layer 314, and the conductive layers 111a and 111b are formed over the insulating layer 367. Thereby, the circuit board 360B can be formed.
- the circuit board 360B and the LED board 370A are attached to each other.
- the substrate 351 is peeled using the peeling layer 353.
- a flexible substrate 362 is attached to the exposed insulating layer 367 with the use of the adhesive layer 363, whereby the display device 380B illustrated in FIG. 2A can be manufactured.
- the substrate 351 is rigid to such an extent that it can be easily transported, and has heat resistance against the temperature required for the manufacturing process.
- Examples of the material that can be used for the substrate 351 include glass, quartz, ceramic, sapphire, resin, semiconductor, metal, and alloy.
- Examples of the glass include alkali-free glass, barium borosilicate glass, and alumino borosilicate glass.
- the separation layer 353 can be formed using an organic material or an inorganic material.
- organic material examples include polyimide resin, acrylic resin, epoxy resin, polyamide resin, polyimide amide resin, siloxane resin, benzocyclobutene resin, and phenol resin.
- the crystal structure of the layer containing silicon may be any of amorphous, microcrystalline, and polycrystalline.
- the substrate 351 may be peeled off by irradiating the peeling interface with a laser.
- a laser an excimer laser, a solid-state laser, or the like can be used.
- DPSS diode pumped solid state laser
- the substrate 351 may be peeled off by applying a pulling force in the vertical direction.
- the separation interface may change depending on the combination of materials of the substrate 351, the separation layer 353, and the insulating layer 367.
- the interface between the substrate 351 and the separation layer 353, the interface between the separation layer 353 and the insulating layer 367 in the separation layer 353, and the like are separation interfaces.
- FIG. 3A is a cross-sectional view of the display device 380C.
- the display device 380C is configured by bonding a circuit board 360C and an LED board 370B.
- two light-emitting diodes are electrically connected to one transistor.
- a plurality of light emitting diodes may be electrically connected to one transistor.
- FIG. 3B shows a cross-sectional view of the LED substrate 370B.
- the LED substrate 370B includes a substrate 371, a light emitting diode 302c, a light emitting diode 302d, a conductor 117a, a conductor 117b, a conductor 117c, and a protective layer 373.
- the light-emitting diodes 302c and 302d have the same configuration, and include an electrode 112, a semiconductor layer 113, a light-emitting layer 114, a semiconductor layer 115, and an electrode 116, respectively.
- the electrode 112 is electrically connected to the semiconductor layer 113 and the conductor 117c.
- the electrode 116 is electrically connected to the semiconductor layer 115 and the conductor 117a or 117b.
- the protective layer 373 is provided so as to cover the substrate 371, the electrode 112, the semiconductor layer 113, the light emitting layer 114, the semiconductor layer 115, and the electrode 116.
- the protective layer 373 covers the side surfaces of the conductors 117a to 117c, and has openings that overlap with the upper surfaces of the conductors 117a to 117c. In the openings, the upper surfaces of the conductors 117a to 117c are exposed.
- the light-emitting layer 114 is a light-emitting layer, and one of the semiconductor layer 113 and the semiconductor layer 115 is an n-type semiconductor layer and the other is a p-type semiconductor layer.
- the light emitting diodes 302c and 302d are formed to emit light of the same color.
- FIG. 3C is a cross-sectional view of the circuit board 360C.
- the circuit board 360C includes a substrate 361, an insulating layer 367, a transistor 303a, an insulating layer 314, a conductive layer 111a, and a conductive layer 111b.
- the conductors 117a and 117b provided on the LED board 370B are connected to the conductive layer 111a provided on the circuit board 360C. Accordingly, the transistor 303a and the light emitting diodes 302c and 302d can be electrically connected.
- the electrode 116 functions as a pixel electrode of the light emitting diodes 302a and 302b. Further, the conductor 117c provided on the LED board 370B and the conductive layer 111b provided on the circuit board 360C are connected.
- the electrode 112 functions as a common electrode for the light emitting diodes 302c and 302d.
- a common electrode is provided for each light emitting diode. However, as shown in the LED substrate 370B, a common electrode (electrode 112) may be provided over a plurality of light emitting diodes. Good.
- FIG. 4A shows a cross-sectional view of the display device 380D.
- the display device 380D is configured by bonding a circuit array 360D and an LED substrate 370C. As will be described later, the circuit array 360D is formed on a substrate via a release layer. Then, the surface of the circuit array 360D exposed by peeling off the substrate is bonded to the LED substrate 370C.
- FIG. 4B shows a cross-sectional view of the LED substrate 370C.
- the LED substrate 370C includes a substrate 371, a light emitting diode 302e, a light emitting diode 302f, a conductor 117a, a conductor 117b, a conductor 117c, and a protective layer 373.
- the light emitting diode 302e includes an electrode 112, a semiconductor layer 113a, a light emitting layer 114a, a semiconductor layer 115a, and an electrode 116a.
- the light emitting diode 302f includes an electrode 112, a semiconductor layer 113b, a light emitting layer 114b, a semiconductor layer 115b, and an electrode 116b.
- the electrode 112 is electrically connected to the semiconductor layers 113a and 113b and the conductor 117c.
- the electrode 116a is electrically connected to the semiconductor layer 115a and the conductor 117a.
- the electrode 116b is electrically connected to the semiconductor layer 115b and the conductor 117c.
- the protective layer 373 is provided so as to cover the substrate 371, the electrode 112, the semiconductor layers 113a and 113b, the light emitting layers 114a and 114b, the semiconductor layers 115a and 115b, and the electrodes 116a and 116b.
- the protective layer 373 covers the side surfaces of the conductors 117a to 117d and has openings that overlap with the upper surfaces of the conductors 117a to 117d. In the openings, the upper surfaces of the conductors 117a to 117d are exposed.
- the separation layer 353 is formed over the substrate 351 and the insulating layer 355 is formed over the separation layer 353. Then, a part of the insulating layer 355 is opened. Next, the transistors 303 c and 303 d and the conductive layer 118 c are formed over the insulating layer 355. Then, the transistors 303c and 303d, the conductive layer 118c, and the like are sealed with the sealing layer 318.
- the transistors 303c and 303d each include a back gate, a gate insulating layer 311, a semiconductor layer, a gate insulating layer, a gate, an insulating layer 315, a source, and a drain.
- the semiconductor layer has a channel formation region and a pair of low resistance regions.
- the back gate (lower gate) and the channel formation region overlap with each other with the gate insulating layer 311 interposed therebetween.
- the gate (upper gate) and the channel formation region overlap with each other through the gate insulating layer.
- the source and the drain are each electrically connected to the low resistance region through an opening provided in the insulating layer 315.
- the conductive layers 118 a and 118 b functioning as a source or a drain are in contact with the separation layer 353 through an opening provided in the insulating layer 355. Further, the conductive layer 118c manufactured using the same material and the same process as the conductive layers 118a and 118b is in contact with the separation layer 353 through an opening provided in the insulating layer 355.
- sealing layer 318 one or both of an inorganic insulating material and an organic insulating material can be used.
- a resin that can be used for an adhesive layer, an inorganic insulating film with high barrier properties, a flexible resin film, and the like can be given.
- FIG. 5B illustrates an example in which the conductive layers 118a, 118b, and 118c are exposed by peeling.
- the peeling layer 353 remains after the substrate 351 is peeled, the conductive layers 118a, 118b, and 118c are exposed by removing the peeling layer 353. Thereby, the circuit array 360D can be formed.
- the display device 380D illustrated in FIG. 4A can be manufactured by attaching the circuit array 360D and the LED substrate 370C to each other.
- the conductor 117a provided on the LED substrate 370C is connected to the conductive layer 118a provided on the circuit array 360D.
- the transistor 303e and the light emitting diode 302e can be electrically connected.
- the electrode 116a functions as a pixel electrode of the light emitting diode 302e.
- the conductor 117b provided on the LED substrate 370C is connected to the conductive layer 118b provided on the circuit array 360D.
- the transistor 303f and the light emitting diode 302f can be electrically connected.
- the electrode 116b functions as a pixel electrode of the light emitting diode 302f.
- the conductor 117c provided on the LED substrate 370D and the conductive layer 118c provided on the circuit array 360D are connected.
- the electrode 112 functions as a common electrode for the light emitting diodes 302e and 302f.
- the sealing layer 318, the insulating layer 355, the gate insulating layer 311, and the insulating layer 315 each transmit the light.
- the low-resistance regions 119a and 119b of the semiconductor layer may be connected to the conductors 117a and 117b through openings provided in the insulating layer 355.
- the low resistance regions 119a and 119b of the semiconductor layer can transmit light emitted from the light emitting diode, so that the light emitting region L2 can be made wider than the light emitting region L1.
- a display device may be manufactured by attaching 360F.
- the light emitting diode 302e and the light emitting diode 302f emit light of the same color.
- Light emitted from the light emitting diode 302e is extracted to the outside of the display device 380F through the colored layer CFA.
- the light emitted from the light emitting diode 302f is extracted to the outside of the display device 380F through the colored layer CFB having a color different from that of the colored layer CFA.
- a display device capable of full color display can be manufactured by providing red, green, and blue colored layers in the circuit array 360F.
- the display devices 380E and 380F are manufactured by changing the circuit array 360D formed over the substrate 351 with the separation layer 353 to the circuit array 360E or the circuit array 360F in the manufacturing method of the display device 380D, respectively. can do.
- the structure of the transistor included in the display device There is no particular limitation on the structure of the transistor included in the display device. For example, a planar transistor, a staggered transistor, or an inverted staggered transistor may be used. Further, any transistor structure of a top gate structure or a bottom gate structure may be employed. Alternatively, gate electrodes may be provided above and below the channel.
- the transistor included in the display device for example, a transistor in which a metal oxide is used for a channel formation region can be used. Thus, a transistor with extremely low off-state current can be realized.
- a transistor including silicon in a channel formation region may be used as a transistor included in the display device.
- the transistor include a transistor including amorphous silicon, a transistor including crystalline silicon (typically low-temperature polysilicon), and a transistor including single crystal silicon.
- Each transistor is provided between the insulating layer 141 and the insulating layer 208.
- the insulating layer 141 preferably has a function as a base film.
- the insulating layer 208 preferably has a function as a planarization film.
- a transistor 220 illustrated in FIG. 8A is a bottom-gate transistor in which the semiconductor layer 204 includes a metal oxide.
- the metal oxide can function as an oxide semiconductor.
- An oxide semiconductor is preferably used for the semiconductor of the transistor. It is preferable to use a semiconductor material with a wider band gap and lower carrier density than silicon because current in an off state of the transistor can be reduced.
- the transistor 220 includes a conductive layer 201, an insulating layer 202, a conductive layer 203a, a conductive layer 203b, and a semiconductor layer 204.
- the conductive layer 201 functions as a gate.
- the insulating layer 202 functions as a gate insulating layer.
- the semiconductor layer 204 overlaps with the conductive layer 201 with the insulating layer 202 interposed therebetween.
- the conductive layer 203a and the conductive layer 203b are electrically connected to the semiconductor layer 204, respectively.
- the transistor 220 is preferably covered with an insulating layer 211 and an insulating layer 212.
- Various inorganic insulating films can be used for the insulating layer 211 and the insulating layer 212. In particular, an oxide insulating film is suitable for the insulating layer 211, and a nitride insulating film is suitable for the insulating layer 212.
- a transistor 230 illustrated in FIG. 8B is a top-gate transistor including polysilicon in a semiconductor layer.
- the transistor 230 includes a conductive layer 201, an insulating layer 202, a conductive layer 203a, a conductive layer 203b, a semiconductor layer, and an insulating layer 213.
- the conductive layer 201 functions as a gate.
- the insulating layer 202 functions as a gate insulating layer.
- the semiconductor layer includes a channel formation region 214a and a pair of low resistance regions 214b.
- the semiconductor layer may further have an LDD (Lightly Doped Drain) region.
- FIG. 8B illustrates an example in which the LDD region 214c is provided between the channel formation region 214a and the low resistance region 214b.
- the channel formation region 214 a overlaps with the conductive layer 201 with the insulating layer 202 interposed therebetween.
- the conductive layer 203a is electrically connected to one of the pair of low resistance regions 214b through an opening provided in the insulating layer 202 and the insulating layer 213.
- the conductive layer 203b is electrically connected to the other of the pair of low resistance regions 214b.
- Various inorganic insulating films can be used for the insulating layer 213.
- a nitride insulating film is suitable for the insulating layer 213.
- Metal oxide A metal oxide that functions as an oxide semiconductor is preferably used for the semiconductor layer. Below, the metal oxide applicable to a semiconductor layer is demonstrated.
- the metal oxide preferably contains at least indium or zinc.
- indium and zinc are preferably included.
- aluminum, gallium, yttrium, tin, or the like is preferably contained.
- One or more kinds selected from boron, titanium, iron, nickel, germanium, zirconium, molybdenum, lanthanum, cerium, neodymium, hafnium, tantalum, tungsten, magnesium, and the like may be included.
- the metal oxide is an In-M-Zn oxide containing indium, an element M, and zinc
- the element M is aluminum, gallium, yttrium, tin, or the like.
- elements applicable to the element M include boron, titanium, iron, nickel, germanium, zirconium, molybdenum, lanthanum, cerium, neodymium, hafnium, tantalum, tungsten, magnesium, and the like.
- the element M may be a combination of a plurality of the aforementioned elements.
- metal oxides containing nitrogen may be collectively referred to as metal oxides.
- a metal oxide containing nitrogen may be referred to as a metal oxynitride.
- a metal oxide containing nitrogen such as zinc oxynitride (ZnON) may be used for the semiconductor layer.
- CAAC c-axis aligned crystal
- CAC Cloud-aligned Composite
- CAC Cloud-Aligned Composite
- CAC-OS or CAC-metal oxide has a conductive function in part of a material and an insulating function in part of the material, and the whole material has a function as a semiconductor.
- the conductive function is a function of flowing electrons (or holes) serving as carriers
- the insulating function is an electron serving as carriers. It is a function that does not flow.
- a function of switching (a function of turning on / off) can be imparted to CAC-OS or CAC-metal oxide by causing the conductive function and the insulating function to act complementarily.
- CAC-OS or CAC-metal oxide by separating each function, both functions can be maximized.
- the CAC-OS or the CAC-metal oxide has a conductive region and an insulating region.
- the conductive region has the above-described conductive function
- the insulating region has the above-described insulating function.
- the conductive region and the insulating region may be separated at the nanoparticle level.
- the conductive region and the insulating region may be unevenly distributed in the material, respectively.
- the conductive region may be observed with the periphery blurred and connected in a cloud shape.
- the conductive region and the insulating region are dispersed in the material with a size of 0.5 nm to 10 nm, preferably 0.5 nm to 3 nm, respectively. There is.
- CAC-OS or CAC-metal oxide is composed of components having different band gaps.
- CAC-OS or CAC-metal oxide includes a component having a wide gap caused by an insulating region and a component having a narrow gap caused by a conductive region.
- the carrier when the carrier flows, the carrier mainly flows in the component having the narrow gap.
- the component having a narrow gap acts in a complementary manner to the component having a wide gap, and the carrier flows through the component having the wide gap in conjunction with the component having the narrow gap. Therefore, when the CAC-OS or the CAC-metal oxide is used for a channel formation region of a transistor, high current driving force, that is, high on-state current and high field-effect mobility can be obtained in the on-state of the transistor.
- CAC-OS or CAC-metal oxide can also be called a matrix composite material (metal matrix composite) or a metal matrix composite material (metal matrix composite).
- An oxide semiconductor (metal oxide) is classified into a single crystal oxide semiconductor and a non-single crystal oxide semiconductor.
- the non-single-crystal oxide semiconductor for example, a CAAC-OS (c-axis aligned crystal oxide semiconductor), a polycrystalline oxide semiconductor, an nc-OS (nanocrystalline oxide semiconductor), a pseudo-amorphous oxide semiconductor (a-like oxide semiconductor) OS: amorphous-like oxide semiconductor) and amorphous oxide semiconductor.
- the CAAC-OS has a c-axis orientation and a crystal structure in which a plurality of nanocrystals are connected in the ab plane direction and have a strain.
- the strain refers to a portion where the orientation of the lattice arrangement changes between a region where the lattice arrangement is aligned and a region where another lattice arrangement is aligned in a region where a plurality of nanocrystals are connected.
- Nanocrystals are based on hexagons, but are not limited to regular hexagons and may be non-regular hexagons.
- a lattice arrangement such as a pentagon and a heptagon in terms of distortion.
- a clear crystal grain boundary also referred to as a grain boundary
- the formation of crystal grain boundaries is suppressed by the distortion of the lattice arrangement. This is because the CAAC-OS can tolerate distortion due to the fact that the arrangement of oxygen atoms is not dense in the ab plane direction and the bond distance between atoms changes due to substitution of metal elements. Because.
- the CAAC-OS is a layered crystal in which a layer containing indium and oxygen (hereinafter referred to as an In layer) and a layer including elements M, zinc, and oxygen (hereinafter referred to as (M, Zn) layers) are stacked.
- In layer a layer containing indium and oxygen
- M, Zn elements M, zinc, and oxygen
- indium and the element M can be replaced with each other, and when the element M in the (M, Zn) layer is replaced with indium, it can also be expressed as an (In, M, Zn) layer. Further, when indium in the In layer is replaced with the element M, it can also be expressed as an (In, M) layer.
- CAAC-OS is a metal oxide with high crystallinity.
- CAAC-OS impurities and defects oxygen deficiency (V O:. Oxygen vacancy also referred) etc.) with less metal It can be said that it is an oxide. Therefore, the physical properties of the metal oxide including a CAAC-OS are stable. Therefore, a metal oxide including a CAAC-OS is resistant to heat and has high reliability.
- the nc-OS has periodicity in atomic arrangement in a minute region (for example, a region of 1 nm to 10 nm, particularly a region of 1 nm to 3 nm).
- the nc-OS has no regularity in crystal orientation between different nanocrystals. Therefore, orientation is not seen in the whole film. Therefore, the nc-OS may not be distinguished from an a-like OS or an amorphous oxide semiconductor depending on an analysis method.
- indium-gallium-zinc oxide which is a kind of metal oxide including indium, gallium, and zinc
- IGZO indium-gallium-zinc oxide
- a crystal smaller than a large crystal here, a crystal of several millimeters or a crystal of several centimeters
- it may be structurally stable.
- the a-like OS is a metal oxide having a structure between the nc-OS and the amorphous oxide semiconductor.
- the a-like OS has a void or a low density region. That is, the a-like OS has lower crystallinity than the nc-OS and the CAAC-OS.
- Oxide semiconductors have various structures and have different characteristics.
- the oxide semiconductor of one embodiment of the present invention may include two or more of an amorphous oxide semiconductor, a polycrystalline oxide semiconductor, an a-like OS, an nc-OS, and a CAAC-OS.
- the metal oxide film functioning as a semiconductor layer can be formed using one or both of an inert gas and an oxygen gas.
- an inert gas an oxygen gas
- oxygen gas an oxygen gas
- the flow rate ratio of oxygen (oxygen partial pressure) during the formation of the metal oxide film is preferably 0% or more and 30% or less, and 5% or more and 30% or less. Is more preferably 7% or more and 15% or less.
- the metal oxide preferably has an energy gap of 2 eV or more, more preferably 2.5 eV or more, and further preferably 3 eV or more. In this manner, off-state current of a transistor can be reduced by using a metal oxide having a wide energy gap.
- the metal oxide film can be formed by a sputtering method.
- a PLD method a PECVD method, a thermal CVD method, an ALD method, a vacuum evaporation method, or the like may be used.
- a metal such as aluminum, titanium, chromium, nickel, copper, yttrium, zirconium, molybdenum, silver, tantalum, or tungsten, or a main component thereof is used. And the like. A film containing any of these materials can be used as a single layer or a stacked structure.
- Two-layer structure to stack, two-layer structure to stack copper film on titanium film, two-layer structure to stack copper film on tungsten film, titanium film or titanium nitride film, and aluminum film or copper film on top of it A three-layer structure for forming a titanium film or a titanium nitride film thereon, a molybdenum film or a molybdenum nitride film, and an aluminum film or a copper film stacked thereon, and a molybdenum film or a There is a three-layer structure for forming a molybdenum nitride film.
- an oxide such as indium oxide, tin oxide, or zinc oxide may be used. Further, it is
- materials that can be used for various insulating layers included in the display device include resins such as acrylic, polyimide, epoxy, and silicone, and inorganic insulating materials such as silicon oxide, silicon oxynitride, silicon nitride oxide, silicon nitride, and aluminum oxide. Materials.
- a plurality of light-emitting diodes and a plurality of transistors can be attached at a time, so that manufacturing costs and yield of the display device can be reduced.
- a display device with reduced power consumption can be realized by combining a micro LED and a transistor using a metal oxide.
- the electronic device of this embodiment includes the display device of one embodiment of the present invention in the display portion.
- the display device of one embodiment of the present invention has high display quality and low power consumption.
- the display device of one embodiment of the present invention can be easily increased in definition and size. Therefore, it can be used for display portions of various electronic devices.
- full high vision, 4K2K, 8K4K, 16K8K, or higher resolution video can be displayed on the display portion of the electronic device of this embodiment.
- Examples of the electronic device include a digital device in addition to an electronic device having a relatively large screen, such as a television device, a desktop or notebook personal computer, a monitor for a computer, a large game machine such as a digital signage or a pachinko machine.
- Examples include a camera, a digital video camera, a digital photo frame, a mobile phone, a portable game machine, a portable information terminal, and a sound reproducing device.
- the electronic device of this embodiment can be incorporated along a curved surface of an inner wall or an outer wall of a house or a building, or an interior or exterior of an automobile.
- the electronic device of this embodiment may include an antenna. By receiving a signal with an antenna, video, information, and the like can be displayed on the display unit.
- the antenna may be used for non-contact power transmission.
- the electronic device of this embodiment includes sensors (force, displacement, position, velocity, acceleration, angular velocity, rotation speed, distance, light, liquid, magnetism, temperature, chemical substance, sound, time, hardness, electric field, current, voltage. , Power, radiation, flow rate, humidity, gradient, vibration, smell, or infrared measurement function).
- the electronic device of this embodiment can have various functions. For example, a function for displaying various information (still images, moving images, text images, etc.) on the display unit, a touch panel function, a function for displaying a calendar, date or time, a function for executing various software (programs), and wireless communication A function, a function of reading a program or data recorded on a recording medium, and the like can be provided.
- FIG. 9A illustrates an example of a television device.
- a display portion 7000 is incorporated in a housing 7101.
- a structure in which the housing 7101 is supported by a stand 7103 is shown.
- the display device of one embodiment of the present invention can be applied to the display portion 7000.
- the television device 7100 illustrated in FIG. 9A can be operated with an operation switch included in the housing 7101 or a separate remote controller 7111.
- the display portion 7000 may be provided with a touch sensor, and the television device 7100 may be operated by touching the display portion 7000 with a finger or the like.
- the remote controller 7111 may include a display unit that displays information output from the remote controller 7111. Channels and volume can be operated with an operation key or a touch panel included in the remote controller 7111, and an image displayed on the display portion 7000 can be operated.
- the television device 7100 is provided with a receiver, a modem, and the like.
- a general television broadcast can be received by the receiver.
- information communication is performed in one direction (from the sender to the receiver) or in two directions (between the sender and the receiver or between the receivers). It is also possible.
- FIG. 9B illustrates an example of a laptop personal computer.
- a laptop personal computer 7200 includes a housing 7211, a keyboard 7212, a pointing device 7213, an external connection port 7214, and the like.
- a display portion 7000 is incorporated in the housing 7211.
- the display device of one embodiment of the present invention can be applied to the display portion 7000.
- 9C and 9D illustrate an example of digital signage.
- a digital signage 7300 illustrated in FIG. 9C includes a housing 7301, a display portion 7000, a speaker 7303, and the like. Furthermore, an LED lamp, operation keys (including a power switch or an operation switch), a connection terminal, various sensors, a microphone, and the like can be provided.
- FIG. 9D illustrates a digital signage 7400 attached to a columnar column 7401.
- the digital signage 7400 includes a display portion 7000 provided along the curved surface of the column 7401.
- the display device of one embodiment of the present invention can be applied to the display portion 7000.
- the wider the display unit 7000 the more information can be provided at one time.
- the wider the display unit 7000 the more easily noticeable to the human eye.
- the advertising effect can be enhanced.
- a touch panel By applying a touch panel to the display unit 7000, not only an image or a moving image is displayed on the display unit 7000, but also a user can operate intuitively, which is preferable. In addition, when it is used for providing information such as route information or traffic information, usability can be improved by an intuitive operation.
- the digital signage 7300 or the digital signage 7400 can be linked by wireless communication with an information terminal 7311 or an information terminal 7411 such as a smartphone possessed by the user.
- an information terminal 7311 or an information terminal 7411 such as a smartphone possessed by the user.
- advertisement information displayed on the display unit 7000 can be displayed on the screen of the information terminal 7311 or the information terminal 7411.
- the display on the display unit 7000 can be switched by operating the information terminal 7311 or the information terminal 7411.
- the digital signage 7300 or the digital signage 7400 can execute a game using the screen of the information terminal 7311 or the information terminal 7411 as an operation means (controller). Thereby, an unspecified number of users can participate and enjoy the game at the same time.
- FIG. 10A is a diagram illustrating the appearance of the camera 8000 with the viewfinder 8100 attached.
- a camera 8000 includes a housing 8001, a display portion 8002, operation buttons 8003, a shutter button 8004, and the like.
- the camera 8000 is attached with a detachable lens 8006. Note that in the camera 8000, the lens 8006 and the housing may be integrated.
- the camera 8000 can capture an image by pressing a shutter button 8004 or touching a display portion 8002 that functions as a touch panel.
- a housing 8001 has a mount having electrodes, and can be connected to a stroboscopic device or the like in addition to the finder 8100.
- the viewfinder 8100 includes a housing 8101, a display portion 8102, a button 8103, and the like.
- the housing 8101 is attached to the camera 8000 by a mount that engages with the mount of the camera 8000.
- the viewfinder 8100 can display a video or the like received from the camera 8000 on the display portion 8102.
- the button 8103 has a function as a power button or the like.
- the display device of one embodiment of the present invention can be applied to the display portion 8002 of the camera 8000 and the display portion 8102 of the viewfinder 8100.
- a camera 8000 with a built-in finder may be used.
- FIG. 10B is a diagram illustrating the appearance of the head mounted display 8200.
- the head mounted display 8200 includes a mounting portion 8201, a lens 8202, a main body 8203, a display portion 8204, a cable 8205, and the like.
- a battery 8206 is built in the mounting portion 8201.
- a cable 8205 supplies power from the battery 8206 to the main body 8203.
- a main body 8203 includes a wireless receiver and the like, and can display received video information on a display portion 8204.
- the main body 8203 includes a camera, and can use information on the movement of the user's eyeballs and eyelids as input means.
- the mounting portion 8201 may have a function of recognizing the line of sight by providing a plurality of electrodes that can detect a current flowing along with the movement of the user's eyeball at a position where the user touches the user. Moreover, you may have a function which monitors a user's pulse with the electric current which flows into the said electrode.
- the wearing unit 8201 may include various sensors such as a temperature sensor, a pressure sensor, and an acceleration sensor, and the function of displaying the user's biological information on the display unit 8204 and the movement of the user's head. It may have a function of changing the video displayed on the display portion 8204 in accordance with the above.
- the display device of one embodiment of the present invention can be applied to the display portion 8204.
- FIG. 10C, FIG. 10D, and FIG. 10E are diagrams showing the appearance of the head mounted display 8300.
- the head mounted display 8300 includes a housing 8301, a display portion 8302, a band-shaped fixture 8304, and a pair of lenses 8305.
- the user can view the display on the display portion 8302 through the lens 8305.
- the display portion 8302 be provided in a curved shape because the user can feel high presence. Further, by viewing another image displayed in a different area of the display portion 8302 through the lens 8305, three-dimensional display using parallax or the like can be performed.
- the present invention is not limited to the configuration in which one display unit 8302 is provided, and two display units 8302 may be provided, and one display unit may be arranged for one eye of the user.
- the display device of one embodiment of the present invention can be applied to the display portion 8302. Since the display device of one embodiment of the present invention has extremely high definition, the pixel is hardly visible to the user even when the display is enlarged using the lens 8305 as illustrated in FIG. In other words, the display portion 8302 can be used to make the user visually recognize a highly realistic image.
- An electronic device illustrated in FIGS. 11A to 11F includes a housing 9000, a display portion 9001, a speaker 9003, operation keys 9005 (including a power switch or an operation switch), a connection terminal 9006, a sensor 9007 (power) , Displacement, position, velocity, acceleration, angular velocity, rotation speed, distance, light, liquid, magnetism, temperature, chemical, voice, time, hardness, electric field, current, voltage, power, radiation, flow rate, humidity, gradient, vibration , Including a function of measuring odor or infrared light), a microphone 9008, and the like.
- the electronic devices illustrated in FIGS. 11A to 11F have various functions. For example, a function for displaying various information (still images, moving images, text images, etc.) on the display unit, a touch panel function, a function for displaying a calendar, date or time, a function for controlling processing by various software (programs), A wireless communication function, a function of reading and processing a program or data recorded in a recording medium, and the like can be provided. Note that the functions of the electronic device are not limited to these, and can have various functions.
- the electronic device may have a plurality of display units.
- a camera or the like has a function of shooting a still image or a moving image and saving it in a recording medium (externally or built in the camera), a function of displaying the shot image on a display unit, etc. Good.
- FIGS. 11A to 11F Details of the electronic devices illustrated in FIGS. 11A to 11F are described below.
- FIG. 11A is a perspective view showing a portable information terminal 9101.
- the portable information terminal 9101 can be used as a smartphone, for example.
- the portable information terminal 9101 may include a speaker 9003, a connection terminal 9006, a sensor 9007, and the like.
- the portable information terminal 9101 can display characters and image information on the plurality of surfaces.
- FIG. 11A shows an example in which three icons 9050 are displayed. Further, information 9051 indicated by a broken-line rectangle can be displayed on another surface of the display portion 9001.
- the information 9051 there are notifications of incoming e-mails, SNSs, telephone calls, etc., titles of e-mails, SNSs, etc., sender names, date / time, time, remaining battery level, and antenna reception strength.
- an icon 9050 or the like may be displayed at a position where the information 9051 is displayed.
- FIG. 11B is a perspective view showing the portable information terminal 9102.
- the portable information terminal 9102 has a function of displaying information on three or more surfaces of the display portion 9001.
- information 9052, information 9053, and information 9054 are displayed on different planes.
- the user can check the information 9053 displayed at a position where the portable information terminal 9102 can be observed from above with the portable information terminal 9102 stored in a chest pocket of clothes. The user can confirm the display without taking out the portable information terminal 9102 from the pocket, and can determine whether to receive a call, for example.
- FIG. 11C is a perspective view showing a wristwatch-type portable information terminal 9200.
- the portable information terminal 9200 can be used as a smart watch, for example.
- the display portion 9001 is provided with a curved display surface, and can perform display along the curved display surface.
- the portable information terminal 9200 can make a hands-free call by communicating with a headset capable of wireless communication, for example.
- the portable information terminal 9200 can perform data transmission and charging with another information terminal through the connection terminal 9006. Note that the charging operation may be performed by wireless power feeding.
- FIG. 11D, 11E, and 11F are perspective views illustrating a foldable portable information terminal 9201.
- FIG. 11D shows a state where the portable information terminal 9201 is unfolded
- FIG. 11F shows a folded state
- FIG. 11E changes from one of FIGS. 11D and 11F to the other. It is a perspective view of the state in the middle of doing.
- the portable information terminal 9201 is excellent in portability in the folded state and excellent in display listability due to a seamless wide display area in the expanded state.
- a display portion 9001 included in the portable information terminal 9201 is supported by three housings 9000 connected by a hinge 9055.
- the display portion 9001 can be bent with a curvature radius of 0.1 mm to 150 mm.
- 111a conductive layer, 111b: conductive layer, 111c: conductive layer, 111d: conductive layer, 112: electrode, 112a: electrode, 112b: electrode, 113: semiconductor layer, 113a: semiconductor layer, 113b: semiconductor layer, 114: light emission Layer, 114a: light emitting layer, 114b: light emitting layer, 115: semiconductor layer, 115a: semiconductor layer, 115b: semiconductor layer, 116: electrode, 116a: electrode, 116b: electrode, 117a: conductor, 117b: conductor, 117c : Conductor, 117d: Conductor, 118a: Conductive layer, 118b: Conductive layer, 118c: Conductive layer, 119a: Low resistance region, 119b: Low resistance region, 141: Insulating layer, 201: Conductive layer, 202: Insulating layer , 203a: conductive layer, 203b: conductive layer, 204: semiconductor layer, 208: insulating layer, 211:
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Abstract
Description
本実施の形態では、本発明の一態様の表示装置について図1~図8を用いて説明する。
本実施の形態の表示装置は、表示素子である発光ダイオードと、表示素子を駆動するトランジスタと、をそれぞれ複数有する。複数の発光ダイオードは、基板にマトリクス状に設けられている。複数のトランジスタは、それぞれ、複数の発光ダイオードの少なくとも一つと電気的に接続される。複数の発光ダイオードは、複数のトランジスタよりも基板側に位置する。複数の発光ダイオードは、基板とは反対側に光を発する。
図1(A)に、表示装置380Aの断面図を示す。
図2(A)に示す表示装置380Bは、基板361を有さず、可撓性を有する基板362及び接着層363を有する点で、表示装置380Aと異なる。
図3(A)に、表示装置380Cの断面図を示す。
図4(A)に、表示装置380Dの断面図を示す。
次に、表示装置に用いることができるトランジスタについて、説明する。
半導体層には、酸化物半導体として機能する金属酸化物を用いることが好ましい。以下では、半導体層に適用可能な金属酸化物について説明する。
本実施の形態では、本発明の一態様の電子機器について、図9~図11を用いて説明する。
Claims (13)
- 基板、複数のトランジスタ、及び、複数の発光ダイオードを有し、
前記複数の発光ダイオードは、前記基板にマトリクス状に設けられており、
前記複数のトランジスタは、それぞれ、前記複数の発光ダイオードの少なくとも一つと電気的に接続され、
前記複数の発光ダイオードは、前記複数のトランジスタよりも前記基板側に位置し、
前記複数の発光ダイオードは、前記基板とは反対側に光を発する、表示装置。 - 請求項1において、
前記複数の発光ダイオードの少なくとも一つは、マイクロ発光ダイオードである、表示装置。 - 請求項1または2において、
前記複数のトランジスタの少なくとも一つは、チャネル形成領域に金属酸化物を有する、表示装置。 - 請求項1乃至3のいずれか一において、
前記複数の発光ダイオードは、第1の発光ダイオード及び第2の発光ダイオードを有し、
前記第1の発光ダイオードと前記第2の発光ダイオードとは、互いに異なる色の光を呈する、表示装置。 - 請求項1乃至4のいずれか一において、
前記複数の発光ダイオードは、白色の光を呈する発光ダイオードを有する、表示装置。 - 請求項1乃至5のいずれか一において、
前記複数のトランジスタの少なくとも一つは、可視光を透過する半導体層を有し、
前記半導体層は、チャネル形成領域と、一対の低抵抗領域を有し、
前記一対の低抵抗領域は、前記チャネル形成領域よりも抵抗が低く、
前記発光ダイオードが発する光は、前記一対の低抵抗領域の少なくとも一方を透過して、前記基板側に射出される、表示装置。 - 請求項1乃至6のいずれか一に記載の表示装置と、コネクタまたは集積回路と、を有する、表示モジュール。
- 請求項7に記載の表示モジュールと、
アンテナ、バッテリ、筐体、カメラ、スピーカ、マイク、及び操作ボタンのうち、少なくとも一つと、を有する、電子機器。 - 第1の基板上に、複数のトランジスタをマトリクス状に形成し、
第2の基板上に、複数の発光ダイオードをマトリクス状に形成し、
前記第1の基板上または前記第2の基板上に、前記複数のトランジスタの少なくとも一つまたは前記複数の発光ダイオードの少なくとも一つと電気的に接続する第1の導電体を形成し、
前記第1の導電体を介して、前記複数のトランジスタの少なくとも一つと前記複数の発光ダイオードの少なくとも一つとが電気的に接続されるように、前記第1の基板と前記第2の基板とを貼り合わせる、表示装置の作製方法。 - 請求項9において、
前記第1の導電体を前記第1の基板上に形成することで、前記第1の導電体と前記複数のトランジスタの少なくとも一つとを電気的に接続させ、
前記第2の基板上に、前記複数の発光ダイオードの少なくとも一つと電気的に接続する第2の導電体を形成し、
前記第1の導電体と前記第2の導電体とが接するように、前記第1の基板と前記第2の基板とを貼り合わせる、表示装置の作製方法。 - 請求項9または10において、
前記第1の基板と前記第2の基板とを貼り合わせた後、前記第1の基板を剥離する、表示装置の作製方法。 - 第1の基板上に、剥離層を形成し、
前記剥離層上に、絶縁層を形成し、
前記絶縁層の一部を開口し、
前記絶縁層上に、複数のトランジスタをマトリクス状に形成し、
前記剥離層上に、前記絶縁層の開口と重なるように、導電層を形成し、
前記複数のトランジスタを封止し、
前記剥離層を用いて前記第1の基板を剥離し、前記剥離層側から前記導電層を露出させ、
第2の基板上に、複数の発光ダイオードをマトリクス状に形成し、
前記導電層を介して、前記複数のトランジスタの少なくとも一つと前記複数の発光ダイオードの少なくとも一つとが電気的に接続されるように、前記第2の基板上に前記複数のトランジスタを転載し、
前記導電層は、前記複数のトランジスタの少なくとも一つと電気的に接続する、または、前記複数のトランジスタの少なくとも一つのソースもしくはドレインとして機能する、表示装置の作製方法。 - 第1の基板上に、剥離層を形成し、
前記剥離層上に、絶縁層を形成し、
前記絶縁層の一部を開口し、
前記絶縁層上に、複数のトランジスタをマトリクス状に形成し、
前記複数のトランジスタを封止し、
前記複数のトランジスタの半導体層は、それぞれ、チャネル形成領域と、一対の低抵抗領域と、を有し、
前記チャネル形成領域は、前記絶縁層上に形成され、
前記一対の低抵抗領域の一方は、前記剥離層上に前記絶縁層の開口と重なるように形成され、
前記剥離層を用いて前記第1の基板を剥離し、前記剥離層側から前記一対の低抵抗領域の一方を露出させ、
第2の基板上に、複数の発光ダイオードをマトリクス状に形成し、
前記一対の低抵抗領域の一方を介して、前記複数のトランジスタの少なくとも一つと前記複数の発光ダイオードの少なくとも一つとが電気的に接続されるように、前記第2の基板上に前記複数のトランジスタを転載する、表示装置の作製方法。
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