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公开(公告)号：US20230122492A1
公开(公告)日：2023-04-20
申请号：US17964438
申请日：2022-10-12
申请人： Lumileds LLC
摘要： A structure and method of micro-LEDs are described. The micro-LEDs have a GaN semiconductor structure containing a multi-quantum well active region configured to emit light of a visible wavelength range and a multilayer reflector structure that includes a distributed Bragg reflector (DBR) with a maximum reflectance at the visible wavelength range and to reflect the light emitted by the active region towards an emission surface of the semiconductor structure. The multilayer reflector structure also has a protective layer between the DBR and the GaN structure that is transparent to light of visible wavelengths. The multilayer reflector structure also has an absorbing metal layer that absorbs the light of visible wavelengths. A conductive material provides electrically contact to the semiconductor structure.
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公开(公告)号：US20220191982A1
公开(公告)日：2022-06-16
申请号：US17123021
申请日：2020-12-15
申请人： Lumileds LLC
发明人： Antonio Lopez Julia , Zhi Hua Song
IPC分类号： H05B45/14 , H05B45/325
摘要： Discussed herein are systems, devices, methods, and computer-readable media for reducing a number of undriven or underdriven uLEDs of a uLED die. A method can include identifying, by a controller of a micro light emitting diode (uLED) die, a dynamic series resistance (Rd) or forward voltage (Vf) of a uLED of the uLED die, selecting, by the controller and based on the identified Rd or Vf, a current level (IPWM_0) less than a maximum current level (IPWM_MAX) supplied by a uLED driver coupled to the uLED die, and causing, by the controller, current, at the selected current level, to be supplied to the uLED driver.
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公开(公告)号：US20230124794A1
公开(公告)日：2023-04-20
申请号：US17964463
申请日：2022-10-12
申请人： Lumileds LLC
摘要： A structure and method of micro-LEDs are described. The micro-LEDs have a GaN semiconductor structure containing a multi-quantum well active region configured to emit light of a visible wavelength range and a structure to increase specular reflection of ambient light by proving scattering at one or more interfaces of the micro-LEDs. The interfaces include the air-encapsulant interface, semiconductor-encapsulant interface, or semiconductor-contact interface.
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公开(公告)号：US20220248513A1
公开(公告)日：2022-08-04
申请号：US17724839
申请日：2022-04-20
申请人： Lumileds LLC
IPC分类号： H05B45/325 , H05B45/37
摘要： A control system for an LED array relies on defining a first and a second group of separately addressed LED pixels, with the first group including pixels with an average current no less than the current at a Q point and a second group including pixels with an average current less than the current at a Q point. An amplitude signal provided to the first group of separately addressed LED pixels is selectively modulated, while providing a DC mode 100% duty cycle. An amplitude signal provided to the second group of separately addressed LED pixels is fixed, and a modulated duty cycle is provided.
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公开(公告)号：US20220191987A1
公开(公告)日：2022-06-16
申请号：US17123010
申请日：2020-12-15
申请人： Lumileds LLC
发明人： Antonio Lopez Julia , Zhi Hua Song
IPC分类号： H05B45/325 , H05B45/44 , H05B45/34
摘要： A micro light emitting diode (LED) die can include a matrix of micro LEDs with a variety of forward voltages. A method of reducing a number of undriven or under driven uLEDs can include providing, by a power supply, an alternating current voltage (VLED) with a minimum voltage (VMIN) and a maximum voltage (VMAX), VMIN being sufficient to drive a plurality of micro light emitting diodes (uLEDs) of a uLED die using a plurality of uLED drivers, identifying, by a controller coupled to the uLED drivers, a uLED of the plurality of uLEDs with a forward voltage (Vf) greater than VMIN, and altering, by the controller, a time of a rising edge of a pulse width modulation (PWM)-on time of the uLED such that Vf of the uLED is less than VLED for the PWM-on time.
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公开(公告)号：US11343890B2
公开(公告)日：2022-05-24
申请号：US16997058
申请日：2020-08-19
申请人： Lumileds LLC
IPC分类号： G09G3/32 , H05B45/325 , H05B45/37
摘要： A control system for an LED array relies on defining a first and a second group of separately addressed LED pixels, with the first group including pixels with an average current no less than the current at a Q point and a second group including pixels with an average current less than the current at a Q point. An amplitude signal provided to the first group of separately addressed LED pixels is selectively modulated, while providing a DC mode 100% duty cycle. An amplitude signal provided to the second group of separately addressed LED pixels is fixed, and a modulated duty cycle is provided.
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公开(公告)号：US11343888B1
公开(公告)日：2022-05-24
申请号：US17123021
申请日：2020-12-15
申请人： Lumileds LLC
发明人： Antonio Lopez Julia , Zhi Hua Song
IPC分类号： H05B45/30 , H05B45/325 , G09G3/32 , H05B45/14
摘要： Discussed herein are systems, devices, methods, and computer-readable media for reducing a number of undriven or underdriven uLEDs of a uLED die. A method can include identifying, by a controller of a micro light emitting diode (uLED) die, a dynamic series resistance (Rd) or forward voltage (Vf) of a uLED of the uLED die, selecting, by the controller and based on the identified Rd or Vf, a current level (IPWM_0) less than a maximum current level (IPWM_MAX) supplied by a uLED driver coupled to the uLED die, and causing, by the controller, current, at the selected current level, to be supplied to the uLED driver.
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