US20190080645A1 - Display optimization techniques for micro-led devices and arrays - Google Patents

Display optimization techniques for micro-led devices and arrays Download PDF

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Publication number
US20190080645A1
US20190080645A1 US16/126,444 US201816126444A US2019080645A1 US 20190080645 A1 US20190080645 A1 US 20190080645A1 US 201816126444 A US201816126444 A US 201816126444A US 2019080645 A1 US2019080645 A1 US 2019080645A1
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pixel
sub
color
pixels
display device
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Gholamreza Chaji
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Vuereal Inc
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Vuereal Inc
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Publication of US20190080645A1 publication Critical patent/US20190080645A1/en
Priority to US17/015,024 priority patent/US11164512B2/en
Priority to US17/494,399 priority patent/US11610535B2/en
Priority to US18/178,157 priority patent/US11948503B2/en
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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
    • H01L27/15—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components having potential barriers, specially adapted for light emission
    • H01L27/153—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components having potential barriers, specially adapted for light emission in a repetitive configuration, e.g. LED bars
    • H01L27/156—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components having potential barriers, specially adapted for light emission in a repetitive configuration, e.g. LED bars two-dimensional arrays
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • 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
    • 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]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • 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
    • G09G3/2007—Display of intermediate tones
    • G09G3/2014—Display of intermediate tones by modulation of the duration of a single pulse during which the logic level remains constant
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L22/00—Testing or measuring during manufacture or treatment; Reliability measurements, i.e. testing of parts without further processing to modify the parts as such; Structural arrangements therefor
    • H01L22/20—Sequence of activities consisting of a plurality of measurements, corrections, marking or sorting steps
    • H01L22/24—Optical enhancement of defects or not directly visible states, e.g. selective electrolytic deposition, bubbles in liquids, light emission, colour change
    • 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
    • H01L33/50—Wavelength conversion elements
    • H01L33/501—Wavelength conversion elements characterised by the materials, e.g. binder
    • H01L33/502—Wavelength conversion materials
    • H05B33/0818—
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/32—Pulse-control circuits
    • H05B45/325—Pulse-width modulation [PWM]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0439—Pixel structures
    • G09G2300/0452—Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264—Details of driving circuits
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • 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
    • G09G3/2003—Display of colours
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L25/00—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof
    • H01L25/03—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes
    • H01L25/04—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers
    • H01L25/075—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00
    • H01L25/0753—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00 the devices being arranged next to each other
    • 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
    • H01L2933/0041—Processes relating to semiconductor body packages relating to wavelength conversion elements

Definitions

  • the present disclosure relates generally to micro LED displays and, more particularly, to a micro LED display system and method for improving dynamic range, power consumption and color and gamma correction of the micro LED display.
  • technologies are generally described herein to achieve desired color accuracy, power consumption, and gamma correction in an array of pixels of a micro-LED display.
  • either the duty cycles or the emission times of sub-pixels arranged in a matrix for each pixel of the micro-LED display may be adjusted to tune the display color without affecting the gamma.
  • a display device may be provided.
  • the display device may include an array of pixels, wherein each pixel may comprising a plurality of subpixels arranged in a matrix.
  • the display device may also include a driving circuitry configured to provide an individual emission control signal to each sub-pixel of each pixel in the array of pixels to independently control a emission time and a duty cycle of each sub-pixel.
  • a method for controlling a pixel circuit of an array of pixel circuits of a display device comprising a plurality of subpixels may include providing an individual emission control signal to each sub-pixel of each pixel in the array of pixel circuits independently to control an emission time and a duty cycle of the sub-pixels.
  • FIG. 1 a is a circuit diagram showing individual emission (EM) control signal for sub-pixel elements.
  • FIG. 1 b is a timing diagram illustrating an example of three different emission time created by three individual EM signal.
  • FIG. 1 c is a timing diagram illustrating an example of controlling the emission time of each sub-pixel.
  • FIG. 2 a -2 b diagrammatic illustrations of a power optimized display driving scheme.
  • sub-pixel and “micro device” are used interchangeably. However, it is clear to one skill in the art that the embodiments described here are independent of the device size. Each pixel and sub-pixel used in the description is a light emitting micro-device (Micro-LED).
  • Micro-LED light emitting micro-device
  • Micro-LEDs in general, tend to have a nonlinear current-luminance efficiency (Cd/A) as a function of the drive current. This characteristic may often includes a peak of efficiency at a certain current level.
  • a display module may consists an array (active or passive) of pixels. Each pixel itself may comprised of multiple sub-pixels (RGB, RGBW, RGBY, or other combination of color elements, e.g. blue with light conversion).
  • RGB, RGBW, RGBY sub-pixels
  • W x,y target “white-point”
  • W x,y white-point
  • it may be required to mix certain ratios of the color elements. For instance, for given Red (R x,y ), Green (G x,y ), and Blue (B x,y ) elements, one can use share factors to create the wanted color based on the sum of all the sets, such as
  • Ki's are the share factors for the tri-color set and x,y are two color coordinates that specify a point on a CIE chromaticity diagram, which represents the mapping of human color perception in terms of the two CIE parameters x and y.
  • the desired output luminance level may be achieved using modulation techniques, e.g. Pulse Width Modulation (PWM). Accordingly, a duty-cycle of the emission (EM) control signal will determine the luminance level.
  • PWM Pulse Width Modulation
  • EM emission
  • the duty-cycle refers to the total amount of time a pulse is ‘on’ over the duration of the cycle/frame.
  • FIG. 1 a is a circuit diagram showing individual EM signals for sub-pixel elements.
  • the driving circuitry 100 includes a plurality of emission control signals ( 102 , 104 , 106 ) and a plurality of data lines ( 108 , 110 , 112 ) extending to a pixel 120 having a plurality of sub-pixels elements ( 114 , 116 and 118 ).
  • a driving circuitry 100 consisting of three individual EM control signals EM R 102 , EM G 104 , and EM B 106 for each subpixel (R 114 , G 116 , B 118 ) may be provided to facilitate proportional contribution of color elements.
  • the driving circuitry 100 may be configured to provide an individual emission control signal to each sub-pixel of each pixel in the array of pixels to independently control a emission time and a duty cycle of the sub-pixels.
  • a desired luminance may be achieved.
  • a first emission control signal e.g. EM R 102 is provided concurrently to each sub-pixel of a first color in at least one row of pixels
  • a second emission control signal e.g. EM G 104 is provided concurrently to each sub-pixel of a second color in at least the one row of pixels
  • a third emission control signal e.g. EM B 106 is provided concurrently to each sub-pixel of a third color in at least the row of pixels.
  • the first color may be provided as red
  • the second color may be provided as green
  • the third color may be provided as blue.
  • a fourth emission control signal may be provided to each sub-pixel of a fourth color in at least one row of pixels in the array of pixels, wherein the fourth color is one of cyan, white, and yellow.
  • the emission control signal may be a pulse-width-modulation (PWM) signal.
  • FIG. 1 b is a timing diagram illustrating an example of three different emission time created by three individual EM signals EM R 102 , EM G 104 and EM B 106 .
  • a frame may start with a off time due to programing or other requirement.
  • the three EM control signals 102 , 104 , 106 of subpixels are enabled.
  • all three emission signals may be enabled at the same time, or they may be enabled at different time during a frame time 120 .
  • the first color e.g. red
  • the second color e.g. green
  • the third color e.g. blue
  • the main challenge with this approach can be the color mixing.
  • FIG. 1 c is a timing diagram illustrating an example of controlling the emission time of each sub-pixel. As shown in Fig lc, different duty cycles 132 , 134 , and 136 are used for controlling the emission time of each subpixels. Moreover, there can be black frame before or after a combination of few toggles.
  • Either the duty cycles 132 , 134 , 136 or the emission times 122 , 124 , 126 as demonstrated in FIG. 1 b and FIG. 1 c can be adjusted to tune the display color without affecting the gamma. For example, if for some application, the display needs to have a white point more towards red, the red emission time 122 (or red duty cycle 136 ) can be increased to provide more red light.
  • a display system can be implemented with a display screen with a number of rows and columns of pixels commonly available in displays for mobile devices, monitor-based devices, and/or projection-devices.
  • a display system can be implemented with a display screen with a number of rows and columns of pixels commonly available in displays for mobile devices, monitor-based devices, and/or projection-devices.
  • a number of different types of pixels each responsible for reproducing color of a particular channel or color such as red, green, or blue, will be present in the display.
  • Pixels of this kind may also be referred to as “subpixels” as a group of them collectively provide a desired color at a particular row and column of the display, which group of subpixels may collectively also be referred to as a “pixel”.
  • Displays configured to display a video feed of moving images typically refresh the display at a regular frequency for each frame of the video feed being displayed.
  • Displays incorporating an active matrix can allow individual pixel circuits to be programmed with display information during a program phase and then emit light according to the display information during an emission phase.
  • displays operate with a duty cycle characterized by the relative durations of the program phase and the emission phase.
  • the displays operate with a frequency that is characterized by the refresh rate of the display.
  • the refresh rate of the display can also be influenced by the frame rate of the video stream.
  • the display can be darkened during program phases while the pixel circuits are receiving programming information.
  • the display is repeatedly darkened and brightened at the refresh rate of the display. A viewer of the display can undesirably perceive that the display is flickering depending on the frequency of the refresh rate.
  • a frame defines the time period that includes a programming cycle or phase during which each and every pixel in the display system is programmed with a programming voltage indicative of a brightness and a driving or emission cycle or phase during which each light emitting device in each pixel is turned on to emit light at a brightness commensurate with the programming voltage stored in a storage element.
  • a frame is thus one of many still images that compose a complete moving picture displayed on the display system.
  • row-by-row a row of pixels is programmed and then driven before the next row of pixels is programmed and driven.
  • frame-by-frame programming all rows of pixels in the display system are programmed first, and all of the pixels are driven at the same time. Either scheme can employ a blanking time at the beginning or end of each frame during which the pixels are not emitting any light.
  • the current of the emissive device is controlled by the pixel circuit to create different grayscales during each frame cycle.
  • the amount of the current is controlled.
  • the main challenge with this method is that the some emissive devices (e.g. micro-LEDs) have efficiency curves that drops at lower current and higher current densities.
  • Another method is to control the duration of the current applied to the pixel for each grayscale.
  • the main one is the timing.
  • the high resolution and high frame rate displays cannot accommodate the timing needed for this approach.
  • the frame timing is adjusted so that the emissive device is working on optimized current density most of the time.
  • the duty cycles 132 , 134 , 136 or emission times 122 , 124 , 126 as shown in FIGs. lb and 1 c can be adjusted so that the emissive device current density is optimized for such brightness.
  • the red emissive device optimized current density can be J r-opt . If the red pixel is on during the entire frame time at such current density, the display can produce brightness B r-full .
  • the emissive time 122 can be calculated as T f *B r-full /B r-mj where T f is the frame time. Similarly, one can calculate the duty cycle 132 for red.
  • one method to find the major brightness is to use the peak brightness and the applications.
  • videos are mainly running at 30% of peak brightness.
  • another method to find the optimize duty cycles 132 , 134 , 136 and emission times 122 , 124 , 126 is to evaluate the frame data to find the optimized duty cycle.
  • the major brightness is calculated for the frame to find the proper value for the duty cycles or emission times.
  • an optimization algorithm is run to find a global or a local optimized value for the duty cycles or the emission times. The same method can be used for multiple frames instead of one frame.
  • the frame can be divided into several sub frame and the emission times or the duty cycles that are optimized for each sub frames for a power consumption of different ranges of gray scales. These optimization can be done similar to the one done for a single sub frame.
  • FIG. 2 a -2 b depicts two examples of power optimized display driving scheme.
  • a panel driving scheme comprises plurality of sub-frame cycles in which at least one gray-scale level may be optimized to achieve lower power consumption.
  • a panel driving scheme 200 a comprises a frame having a plurality of sub-frame cycles such as low grayscale emission time 222 l and no emission 208 l for low grayscale subframe 206 l and high grayscale emission time 222 h and no emission 208 h for high grayscale subframe 206 h during a frame time 220 .
  • the emission time 222 l , 222 h optimization for both low and high grayscale ranges is used. Every row of the display array is accessed only twice during each frame time 220 to refresh the pixel contents within that row according to the optimized video data.
  • the row access interval may be separated by one or more row times. Accordingly, in this driving scheme, the memory buffer depth requirement may be limited to the number of rows between two consecutive access intervals.
  • the duty cycle optimization is used.
  • the duty cycle 232 l and 232 h is optimized for two range of grayscales (e.g. low and high) to achieve the lowest power consumption.
  • a display device may be provided.
  • the display device may comprising an array of pixels, wherein each pixel comprising a plurality of subpixels arranged in a matrix and a driving circuitry configured to provide an individual emission control signal to each sub-pixel of each pixel in the array of pixels to independently control a emission time and a duty cycle of each sub-pixel.
  • the display may further include a first emission control signal may be provided concurrently to each sub-pixel of a first color in at least one row of pixels, a second emission control signal may be provided concurrently to each sub-pixel of a second color in at least the one row of pixels, and a third emission control signal may be provided concurrently to each sub-pixel of a third color in at least the row of pixels.
  • the first color may be red
  • the second color may be green
  • the third color may be blue.
  • the display may further comprising a fourth emission control signal may be provided to each sub-pixel of a fourth color in the array of pixels, wherein the fourth color is one of cyan, white, and yellow.
  • the emission control signal may be a pulse-width-modulation (PWM) signal and each pixel and sub-pixel may be a micro-light emitting device (LED).
  • PWM pulse-width-modulation
  • LED micro-light emitting device
  • the first, second and third emission control signals may enabled at a same time or a different time during a frame time.
  • the first, second and third emission control signals may turned on and off multiple times at different duty cycle during the frame time.
  • the emission time or the duty cycle for each sub-pixel may dynamically adjusted to tune the display device color and optimize power consumption.
  • a frame data may be evaluated to find the optimized duty cycle and the emission time.
  • An optimization algorithm may employed to calculate a global or a local optimized value for the duty cycle or the emission time for each sub-pixel.
  • the duty cycle may be optimized for two range of grayscales to achieve the lowest power consumption.
  • a method for controlling a pixel circuit of an array of pixel circuits of a display device may include providing an individual emission control signal to each sub-pixel of each pixel in the array of pixel circuits independently to control an emission time and a duty cycle of the sub-pixels.
  • the emission time or the duty cycle for each sub-pixel may dynamically adjusted to tune the display device color and optimize power consumption.
  • a frame data may evaluated to find the optimized duty cycle and the emission time.
  • an optimization algorithm may be employed to calculate a global or a local optimized value for the duty cycle or the emission time for each sub-pixel.
  • the duty cycle may optimized for two range of grayscales to achieve the lowest power consumption.
  • the emission control signal may be a pulse-width-modulation (PWM) signal.
  • PWM pulse-width-modulation
  • Each pixel and sub-pixel is a micro-light emitting device (LED).
  • the method may further comprising providing a first emission control signal concurrently to each sub-pixel of a first color in at least one row of pixels, providing a second emission control signal concurrently to each sub-pixel of a second color in at least the one row of pixels; and providing a third emission control signal concurrently to each sub-pixel of a third color in at least the row of pixels.

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  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Theoretical Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Electroluminescent Light Sources (AREA)
  • Control Of El Displays (AREA)
  • Led Devices (AREA)
US16/126,444 2017-09-11 2018-09-10 Display optimization techniques for micro-led devices and arrays Abandoned US20190080645A1 (en)

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US16/126,444 US20190080645A1 (en) 2017-09-11 2018-09-10 Display optimization techniques for micro-led devices and arrays
US17/015,024 US11164512B2 (en) 2017-09-11 2020-09-08 Display optimization techniques for micro-LED devices and arrays
US17/494,399 US11610535B2 (en) 2017-09-11 2021-10-05 Display optimization techniques for micro-LED devices and arrays
US18/178,157 US11948503B2 (en) 2017-09-11 2023-03-03 Display optimization techniques for micro-LED devices and arrays

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US16/126,444 US20190080645A1 (en) 2017-09-11 2018-09-10 Display optimization techniques for micro-led devices and arrays

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US17/015,024 Active US11164512B2 (en) 2017-09-11 2020-09-08 Display optimization techniques for micro-LED devices and arrays
US17/494,399 Active US11610535B2 (en) 2017-09-11 2021-10-05 Display optimization techniques for micro-LED devices and arrays
US17/683,318 Active 2039-08-02 US12051359B2 (en) 2017-09-11 2022-02-28 Repair techniques for micro-LED devices and arrays
US18/178,157 Active US11948503B2 (en) 2017-09-11 2023-03-03 Display optimization techniques for micro-LED devices and arrays
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US17/683,318 Active 2039-08-02 US12051359B2 (en) 2017-09-11 2022-02-28 Repair techniques for micro-LED devices and arrays
US18/178,157 Active US11948503B2 (en) 2017-09-11 2023-03-03 Display optimization techniques for micro-LED devices and arrays
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Cited By (5)

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Publication number Priority date Publication date Assignee Title
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