123 results about "Green led" patented technology

A GaN-based blue-green LED epitaxial structure, relating to the field of semiconductor photoelectric devices. The GaN-based blue-green LED epitaxial structure comprises a substrate, and a buffer layer, a dislocation regulation layer, a U-GaN layer, an N-GaN layer, a multi-quantum-well layer, an electron blocking layer and a P-GaN layer which are sequentially stacked on the substrate, wherein the dislocation regulation layer is of a periodic structure with the number of periods ranging from 2 to 10, and each period comprises a GaN layer and an Si-doped GaN layer that are sequentially stacked. The crystal quality of the epitaxial structure can be improved, thereby improving the light-emitting efficiency and the antistatic performance of the blue-green LED based on the epitaxial structure.

The invention discloses a display brightness compensation method, a display device and a computer readable storage medium. The display brightness compensation method comprises the following steps: acquiring a compensation model between environment temperatures of a red LED, a green LED and a blue LED and current gains of corresponding constant-current driving chips; detecting whether a display picture of the display panel is a preset picture or not; if the picture is detected to be the preset picture, acquiring actual environment temperatures of the red LED, the green LED and the blue LED; and substituting the actual environment temperatures of the red LED, the green LED and the blue LED into the compensation model to obtain an analog current gain of a corresponding constant-current driving chip, and adjusting the current gain of the corresponding constant-current driving chip to the analog current gain. According to the method, the display brightness and color temperature offset caused by the temperature difference of the LED in the display device can be avoided.

The invention discloses an LCOS optical illumination system for an AR-HUD projection unit, and belongs to the field of photoelectric illumination and display technologies. The system comprises an illumination light source, a collimating lens, a fly-eye lens, an optical diffuser, a wavelength selective light combination element, a polarized light conversion device, a relay lens, a PBS prism and an LCOS display chip. The illumination light source is a three-color LED light source and is composed of a red light LED, a green light LED and a blue light LED. After red primary light, green primary light and blue primary light are collimated by the collimation system, the light parallelism is optimized, the collimated light sequentially passes through the light diffusion element to optimize the light field uniformity and the fly-eye lens to eliminate the non-uniform illumination, then is unified into a single linear polarization state by the polarized light converter, is shaped by the relay system and keeps the light beam transmission quality, and finally is transmitted to the light source. And polarization state separation and light combination are realized through the PBS prism, and finally, the light is accurately coupled to the LCOS display chip, so that high-efficiency polarization state matching and imaging quality optimization are completed. According to the HUD-PGU system, the illumination brightness of the whole system is improved, the color reducibility of the system is improved, the illumination uniformity of system imaging is improved, the light energy utilization rate of the system is improved, meanwhile, the size of the HUD-PGU is reduced, and the manufacturing cost is reduced.

The invention discloses a low-cost train operation control simulation system based on digital twinning and an SSA-DBO algorithm. The system is composed of hardware, software and a digital twinborn body. Firstly, a single chip microcomputer, a wireless communication module, a common cathode nixie tube, a yellow-green LED lamp, a motor driving module and the like are designed as hardware, and the modules form a physical entity; secondly, according to software design, input signals of a track circuit are monitored, and corresponding logic judgment and processing are carried out according to received information; and finally, the digital twin designs a virtual model based on a physical system, the virtual model comprises a train, a track, a sensor and other components, various state information of the physical system is collected in real time through a track circuit, the train sensor and the like of the solid model, the state information is uploaded to a server by utilizing the Internet of Things technology, and after data screening is carried out through an SSA-DBO algorithm, the state information of the physical system is obtained. The data and the model together drive the digital twin for monitoring, analysis, optimization, prediction and visualization.

The present application relates to a kind of blue-green LED epitaxial wafer and its preparation method, and the multiple quantum well light-emitting layer of blue-green LED epitaxial wafer includes gradually changing InGaN layer before well, first blue light InGaN layer, first AlGaInN interface protection layer, green light InGaN layer, second AlGaInN interface protection layer, second blue light InGaN layer, gradually changing InGaN layer after well, quantum barrier layer, and gradually changing InGaN layer before well includes multiple first InGaN layer of sequentially stacked, the In component content of multiple first InGaN layer is sequentially increased along the direction of epitaxy;Gradually changing InGaN layer after well includes multiple second InGaN layer of sequentially stacked, the In component content of multiple second InGaN layer is sequentially decreased along the direction of epitaxy. Wherein, N2 atmosphere heat treatment is needed before depositing first AlGaInN interface protection layer, and before depositing second AlGaInN interface protection layer. The present application can effectively reduce the preparation cost of LED backlight light source, active region has good recombination efficiency, and LED chip light uniformity is good.

The LED panel has multiple LED pixel units arranged in a row. Each LED pixel unit has: a normal element, including a red LED element, a green LED element, and a blue LED element; and a low-brightness element for outputting a brightness lower than the minimum brightness of the normal element.

The application discloses a high-voltage cabinet electricity detection display device. The high-voltage cabinet electricity detection display device comprises a transmitting module and a receiving module arranged in the high-voltage cabinet. The transmitting module comprises a battery pack, a starting button, an LC tuning circuit and a first yellow LED display lamp. The LC tuning circuit converts the power provided by the battery pack into a changing magnetic field, and the first yellow LED display lamp displays the working state of the LC tuning circuit. The receiving module comprises a receiving coil, a second yellow LED display lamp, a green LED display lamp, a red LED display lamp, a grounding wire and a high-voltage electrode. The receiving coil induces an electromotive force in response to the changing magnetic field. The second yellow LED display lamp displays the power state of the receiving module, and the green LED display lamp and the red LED display lamp display the electrified state of the high-voltage end. When the high-voltage cabinet electrified display device fails, the high-voltage cabinet electricity detection display device can be used as a backup electricity detection device to obtain the electrified state of the conductor.

A light emitting diode, LED, filament (1) configured to provide, in an on-state, LED filament light (2), and comprising an elongated carrier (3) comprising a longitudinal direction (LD), and a two-dimensional array of a plurality of LEDs (4) arranged on a first major surface (31) of the elongated carrier (3), and configured to, in operation, emit LED light (41). The two-dimensional array of a plurality of LEDs (4) comprises N rows of LEDs 5 and M columns of LEDs, where N ≥ 6 and M ≥ 50, and where the N rows of LEDs extend along the longitudinal direction (LD) of the elongated carrier. The two-dimensional array of a plurality of LEDs (4) has an outline having an outline width, W, and an outline length, L, W being in a range from 1 to 6 mm and L being at least 25 mm, and an aspect ratio is defined as L / W is at least 10. The plurality of LEDs comprises a plurality of X direct-emitting red LEDs 10 (4a), each comprising a red die (42a) having a first die surface area, SA1, a plurality of Y direct-emitting green LEDs (4b), each comprising a green die (42b) having a second die surface area, SA2, and a plurality of Z direct-emitting blue LEDs (4c), each comprising a blue die (42c) having a third die surface area, SA3. A coverage of the plurality of LEDs defined as the ratio of the total surface area of the red dies (42a), the green dies (42b) and the 15 blue dies (42c) to the surface area being enclosed by the outline of the two-dimensional array of a plurality of LEDs (4) is in a range from 10 to 40 %. The first die surface area, SA1, the second die surface area, SA2, and the third die surface area, SA3, each have a largest spatial extent, SE, that is less than or equal to 100 micrometers.

The utility model relates to the technical field of LED (light-emitting diode) screens, in particular to a driving system for an LED display screen, which comprises a driving circuit arranged on a PCB (printed circuit board) substrate of the LED display screen and used for driving an LED wafer; the driving circuit comprises a driving IC and an LED driving circuit; the LED driving circuit comprises a plurality of LED driving row tubes MOS (Metal Oxide Semiconductor) which are arranged in an array; the light-emitting diodes are arranged on the LED driving row tube MOS, the LED wafer is located in the light-emitting diodes, one red light-emitting diode, one green light-emitting diode and one blue light-emitting diode are combined into one pixel, and the light-emitting diodes of the pixels share the same pole; the driving IC comprises a row driving circuit and a constant current driving circuit; the row driving chips of the row driving circuit are grouped and connected in series to form the row driving circuit which is connected with the LED driving row tube MOS; the LED display PWM driving chips of the constant current driving circuit are grouped and connected in series to form the constant current driving circuit which is connected with the LED driving row tube MOS, so that the driving effect of the LED display screen is guaranteed, the energy consumption is saved, the structure is simple, and the production is convenient.

The invention provides an optical guiding method for recycling a deep-sea unmanned underwater vehicle, and belongs to the technical field of underwater vehicle recycling. Four blue-green LED guiding light sources are non-uniformly and annularly distributed and installed on the front end face of a recycling cage, the three-dimensional coordinates of the guiding light sources are calibrated in advance, and guiding light source images are collected in real time through a binocular camera; an adaptive exposure control technology is adopted to adjust image quality, statistical information calculation is performed on an identified light source contour, an effective guide light source target is determined through convex constraint configuration judgment and ellipse fitting screening, four guide light sources are constructed as a traveling salesman problem, and a nearest neighbor heuristic algorithm is adopted to complete number matching. A rotation matrix and a translation vector are solved through a singular value decomposition method according to the pre-measured coordinates and the real-time calculated coordinates, and collaborative optimization is carried out at the same time, so that the technical problems of insufficient optical guidance positioning precision and poor real-time performance in the recovery process of the unmanned underwater vehicle in the deep sea environment are solved.

The utility model provides a single-turn coil motor principle demonstrator, which comprises an iron bottom plate, the upper surface of the iron bottom plate is fixedly connected with a fixing frame, the top end of the fixing frame is rotatably provided with a rotating hand wheel, the middle part of the fixing frame is provided with a rotatable stator magnet frame, and the rotatable stator magnet frame is provided with a strong magnet. A commutator is rotationally installed in the middle of the iron bottom plate, a single-turn coil rotor shaft is axially installed on the commutator, a single-turn copper coil is arranged on the single-turn coil rotor shaft, a current direction indicating circuit board is installed at the bottom end of the single-turn copper coil, and a copper electric brush is installed between the current direction indicating circuit board and the commutator. The input and output terminal and the red and green LED lamp are respectively arranged on two sides of the edge of the upper surface of the iron bottom plate; the demonstrator adopts a vertical tip structure, is small in friction force, flexible in rotation, obvious in demonstration effect, smaller in friction force and smoother in rotation due to the design of the rotating circuit board and the indication of the current direction of the single-turn copper coil by the red and green indication lamps, and the rotating part adopts the single-side bearing.

The invention relates to a multi-end peer-to-peer real-time communication pressure plate data transmission system based on an RS485 network, which comprises a pressure plate data acquisition circuit, a peer-to-peer 485 interface circuit, an RS485 hard sending time control window circuit, a main control circuit, a power supply circuit and an indicator lamp circuit, the pressing plate data acquisition circuit is arranged below a monitored pressing plate, the pressing plate is provided with a magnet, the magnet and the pressing plate data acquisition circuit are located on the same axis, and the pressing plate data acquisition circuit is used for detecting the strength of a magnetic line of force of the hard pressing plate magnet installed on the protection screen cabinet penetrating through the Hall sensor so as to acquire the state of the hard pressing plate; the indicating lamp circuit adopts two red and green LED lamps and is used for indicating data transmission and pressing plate information reporting states. According to the RS485 bus communication network realized by the invention, polling is not needed when real-time data is uploaded once, only one second is needed when pressure plate data change is uploaded, and the communication time is prolonged by 956 times compared with that of a traditional mode.

The utility model belongs to the technical field of LED chips, and discloses a green light LED chip based on an N-type GaN layer embedded DBR structure, which comprises a substrate, and a first buffer layer, a first non-doped GaN layer, a green light MQW layer, a second non-doped GaN layer, an N-type GaN layer, a DBR layer, a second buffer layer, a third non-doped GaN layer, a blue light MQW layer, an electron blocking layer and a P-type GaN layer which are sequentially deposited on the substrate, a P electrode is arranged on the P-type GaN layer, and the DBR layer is formed by periodically and alternately laminating two dielectric materials with different refractive indexes. According to the utility model, the DBR layer is embedded between the N-type GaN layer and the blue light quantum well, downward photons are directly reflected, the light extraction efficiency is improved, the photon reflection path is shortened, the absorption loss is reduced, a low-stress growth template is provided for the blue light quantum well, the dislocation density is reduced, and the growth quality of the blue light quantum well is improved.

To solve the problem in which previously, under low brightness conditions, there were issues such as the occurrence of unpleasant flicker and the lowness of achieving certain color spaces.SOLUTION: A light emitting diode (LED) device comprises: a circuit board; a plurality of LED packages arranged on the circuit board, the LED package comprising a pair of red LEDs arranged adjacent to one another, the pair of red LEDs configured to emit respective red light at respective different red wavelengths, a pair of green LEDs arranged adjacent to one another, the pair of green LEDs configured to emit respective green light at respective different green wavelengths, and a pair of blue LEDs arranged adjacent to one another, the pair of blue LEDs configured to emit respective blue light at respective different blue wavelengths. The LED device further comprises: an integrated circuit (IC) configured to independently control the pair of red LEDs, the pair of green LEDs and the pair of blue LEDs; and an electrical connector connected to respective integrated circuits of the plurality of LED packages, the electrical connector configured to communicate with an image providing device.SELECTED DRAWING: Figure 2A

A display apparatus includes: a liquid crystal panel, a backlight unit configured to provide light to the liquid crystal panel, a quantum dot (QD) sheet arranged the liquid crystal panel and the backlight unit, and a processor configured to control the liquid crystal panel and the backlight unit. The backlight unit may include a substrate and a plurality of dimming blocks arranged in a plurality of rows and columns and each including a red light-emitting diode (LED), a green LED, and a blue LED. The processor may be configured to, based on an ON signal of an LED having a color identical to a color of QD particles of the QD sheet, control the backlight unit to turn the blue LED on together with the LED that receives the ON signal.

The invention discloses an LED display screen control method and device for real-time voltage regulation and a medium, and relates to the technical field of LED display screens. The method comprises the steps that first voltage is provided for a red LED lamp bead set through an independent power supply channel, and second voltage is provided for a blue-green LED lamp bead set through an independent power supply channel; acquiring a video stream, decoding the video stream, intercepting a video frame picture, and recording a picture intercepting moment; dividing the video frame picture to obtain a grid picture, and calculating a power demand ratio of red pixels to blue-green pixels in the grid picture; generating a voltage regulation instruction according to the power demand ratio and the real-time temperature data, and recording a voltage regulation instruction generation moment; and calculating the time delay of the picture interception moment and the voltage regulation instruction generation moment, and delaying the voltage regulation instruction so as to synchronously act on the LED display screen with the corresponding video frame picture. According to the method, the color separation independent power supply channel is combined with the picture gridding RGB power demand calculation, so that the output voltage is matched with the real power consumption of different color areas in real time.

The invention provides a system for detecting light-emitting diode core particles, which comprises the following steps of: detecting the wavelength of each light-emitting diode core particle on a master slice, wherein the wavelength range of a red light-emitting diode core particle is 625nm-740nm, the wavelength range of a green light-emitting diode core particle is 500nm-565nm, and the wavelength range of a blue light-emitting diode core particle is 440nm-485nm; according to the wavelength of each light-emitting diode core particle, obtaining a wavelength arrangement diagram of all the light-emitting diode core particles; in each wave band range, according to the number of the light-emitting diode core particles needed in the sub-sheets, sorting the light-emitting diode core particles to the sub-sheets in an equal proportion; wherein in each sub-sheet, the arrangement mode of the light emitting diode core particles is the same as the wavelength arrangement diagram. Through the system of the light-emitting diode core particles provided by the invention, the uniformity of the display panel can be improved.

The invention discloses a green light-emitting diode device and a preparation method thereof. FAPbBr3 perovskite nanocrystals are synthesized by a ligand-assisted reprecipitation method, wherein FABr and PbBr2 serve as FA sources, Pb sources, and Br sources, chloroform serves as an antisolvent, and acetonitrile serves as a reaction quencher. The green light-emitting diode device comprises a substrate printed with an anode, a hole transport layer, a hole injection layer, a light-emitting layer, a first electron transport layer, a second electron transport layer, and a cathode, which are arranged in sequence from bottom to top. By adding thiophenol as a new organic ligand to acetonitrile to replace part of the traditional ligand, the surface defects of the material are significantly passivated, thereby improving the photoluminescence quantum yield of the material and the photoelectric performance of the LED prepared from the material. Unlike traditional ligands, thiophenol does not contain a long alkyl chain but has a benzene ring with better conductivity, so the electrical performance of the LED prepared using the thiophenol is also improved. In addition, it can be proved that the introduction of thiophenol does not affect the emission wavelength of the LED.

A computer-implemented method for converting received red green blue (RGB) video data into red green blue and fourth color (RGBF) LED drive signals is disclosed. The method may include receiving RGB video data representing a video including a plurality of frames. Each frame may include a plurality of pixels. For each pixel of each frame of the video, the RGB video data may define R, G, and B brightnesses for representing the color and brightness of the pixel. The method may also include generating an RGBF LED drive signal according to the received RGB video data. The RGBF LED drive signal may be configured for driving one or more LED modules including a plurality of LED units. Each LED unit may represent a pixel. Each LED unit may include a red LED, a green LED, a blue LED, and a fourth color LED different in color from the red LED, the green LED, or the blue LED. The generating may also include applying a control parameter to adjust a characteristic of the RGBF LED drive signal.

The LED filament lamp (1) is configured to provide light emitted from a plurality of LED filaments (2, 3, 12). The LED filament lamp (1) comprises a green LED filament (2) for phosphor conversion and a red-blue LED filament (3) for mixed direct emission. The LED filament lamp (1) comprises at least one first LED filament (2) and at least one second LED filament (3). The first LED filament (2) comprises a plurality of first blue LEDs (91) configured to emit, in operation, first LED light as blue light. When light is emitted from a blue or UV LED (91), light passes through the mixture of light green phosphor coatings, where the converted light is distributed predominantly as green light in a portion of the visible spectrum. The first LED light is converted into first converted light that is only green light. The light emitted from the second LED filament (3) may be blue light or red light, or light mixed with blue light or red light. The red-blue light emitted from the red-blue LED filament (3) stimulates the opposite blue and red receptors of the eye and the converted green light stimulates the green receptors of the eye such that the resulting mixture of the converted green light, blue light and red light gives the appearance of white light. The white light may be controllable. The LED filaments (2, 3, 12) may be controllable such that the LED filaments (2, 3, 12) together emit white light with variable color temperature or colored light.

This invention provides an optical guidance method for the recovery of deep-sea unmanned underwater vehicles (UUVs), belonging to the field of underwater vehicle recovery technology. The invention involves installing four blue-green LED guidance light sources in a non-uniform ring distribution on the front face of the recovery cage and pre-calibrating their three-dimensional coordinates. A binocular camera is used to acquire images of the guidance light sources in real time. Adaptive exposure control technology is employed to adjust image quality. Statistical information calculations are performed on the identified light source contours, and effective guidance light source targets are determined through convex constraint configuration judgment and ellipse fitting. The four guidance light sources are constructed as a traveling salesman problem, and a nearest neighbor heuristic algorithm is used to complete numbering matching. Based on pre-measured coordinates and real-time calculated coordinates, the rotation matrix and translation vector are solved using singular value decomposition, while simultaneously performing collaborative optimization. This method solves the technical problems of insufficient optical guidance positioning accuracy and poor real-time performance during the recovery of UUVs in deep-sea environments.

The utility model discloses an LED visual approach gradient indicating system for a helicopter farm. The LED visual approach gradient indicating system comprises two LED assembling units, each assembling unit is composed of a plurality of red LEDs, a plurality of green LEDs, a plurality of collimating lenses, a light beam combiner and an imaging lens. The LEDs of each assembly unit are divided into four groups, namely flashing red, stable red, stable green and flashing green; the light beam combiner is used for combining four beams of light of flashing red light, stable red light, stable green light and flashing green light into one beam; the red LED is positioned at the upper part of the green LED, and a collimating lens is arranged in front of each LED; light beams emitted by the LED are collimated by the collimating lens, four light beams are combined into one light beam by the beam combiner, and the light beam is projected to a distance by the imaging lens to form four areas; and the flash red color, the stable red color, the stable green color and the flash green color are respectively arranged from bottom to top.

A low-frequency-band radio measuring head circuit comprises a power supply module, a central control module connected with the power supply module, a trigger signal module, an indicating lamp module, and an antenna module and a crystal oscillator module which are connected with the central control module. Wherein the trigger signal module and the indicating lamp module are connected with the central control module; the trigger signal module comprises a radio communication measuring head, and the radio communication measuring head is electrically connected with a first detection point. And the reset circuit module is connected with the central control module. The system also comprises an internal filtering module connected with the central control module, and a power supply filtering module connected with the power supply module. The crystal oscillator module comprises a main crystal oscillator module and a low-frequency crystal oscillator module; and the main crystal oscillator module and the low-frequency crystal oscillator module are respectively connected with the central control module. The indicating lamp module comprises a plurality of groups of green light-emitting diodes, red light-emitting diodes and blue light-emitting diodes which are connected in parallel. The utility model has the beneficial effects of strong penetrating power, interference resistance and low equipment power consumption.

The utility model relates to the technical field of lamps, in particular to a dyeing surface light two-in-one lamp which comprises a lamp shell, a power source, a circuit substrate, a light source and a driving control panel, the power source and the light source are both electrically connected with the driving control panel, the light source comprises more than one lamp bead substrate, and a light-emitting plane is arranged on the surface of each lamp bead substrate. According to the design that the cold white LED light-emitting chips, the warm white LED light-emitting chips, the red LED light-emitting chips, the green LED light-emitting chips and the blue LED light-emitting chips are integrated on the same lamp bead substrate, the use number of light sources can be reduced, the overall size of the lamp is further reduced, a user can adjust the power of the different light-emitting chips through the driving control panel, and therefore the light-emitting efficiency of the lamp is improved. Under the state that the total output power is constant, the dyeing function of a dyeing lamp can be met, the brightness requirement of a surface light lamp can be completely met, illumination light rays are more uniform, and the color mixing effect is better.

A photoplethysmographic module comprising at least one LED and a photodetector, characterized in that it comprises at least two subassemblies consisting of an alignment of a photodetector associated on either side with two green LEDs, and an infrared sensor. Figure 1

The utility model discloses a hexagonal three-primary-color LED and Micro LED display screen, which comprises a hexagonal packaging piece main body, a red LED, a green LED and a blue LED are arranged in the packaging piece main body, the positive poles of the red LED, the green LED and the blue LED share the same pole at the central position of the packaging piece main body to form a positive pole, and the positive poles of the red LED, the green LED and the blue LED share the same pole at the central position of the packaging piece main body. And the red LEDs, the green LEDs and the blue LEDs are distributed in an annular array at the central position of the packaging piece main body and form negative electrodes on the back surface of the packaging piece main body respectively. An original pixel arrangement mode is changed into three-primary-color LED arrangement, three-color LEDs are integrated in a packaging piece body of each LED, compared with an original mode that RGB color matching is needed, the RGB three-color LEDs are directly integrated into the packaging piece body, then the packaging piece body serves as a body for mass transfer, and then the problems that existing Micro LEDs are low in mass transfer efficiency, low in yield and high in cost are solved.

The utility model relates to an LED (light-emitting diode) display screen, which comprises a substrate provided with a control circuit; the array substrate comprises a substrate body and m * n pixel units, the pixel units are evenly arranged on the substrate body at intervals in rows and columns, each pixel unit comprises four LED light sources arranged in a 2 * 2 matrix, each LED light source is provided with a positive electrode and a negative electrode, and the four LED light sources of each pixel unit comprise a red LED light source, a blue LED light source and two green LED light sources. According to the LED display screen, more pixels are generated in the mode that the LED light sources arranged in the 2 * 2 matrix form the pixel units; and the number of circuits is reduced, so that the preparation process is simplified, and heat dissipation is facilitated.

The present application belongs to the technical field of apple snail prevention and control, and specifically discloses a continuous snail catching visual device triggered by light induction, which comprises a space trap, an inner floating ring, a fixed insertion rod, a collection container, a light-shielding barrel, an outer floating ring and a solar panel. The device is fixed to the water bottom through the telescopic fixed insertion rod, and the water space trap part is fixed to the inner floating ring, so that it can float up and down with the water level change, increasing the applicable scenarios. The device collects apple snails through the light-shielding barrel and green LED light source, and the fixed insertion rod can be climbed by the apple snails into the space trap. The outer wall of the space trap is provided with multiple active doors which are turned over by trigger pressure sensors. When the apple snails climb onto the active door, the active door is turned inward, and the apple snails are impacted and fall into the collection container. The collection container adopts a waterproof cloth bag, so that the apple snails close their shells due to drought, preventing them from escaping and achieving ecological killing. The present application can automatically capture apple snails and overcome various defects of the existing apple snail trapping devices.

A display apparatus including: a liquid crystal panel and a backlight unit. The backlight unit includes a substrate, a plurality of dimming blocks provided in a plurality of rows and a plurality of columns on the substrate, each dimming block of the plurality of dimming blocks including a plurality of light emitting devices, and a plurality of driving devices that drive the plurality of dimming blocks. Each light emitting device of the plurality of light emitting devices includes a red light emitting diode (LED), a green LED, and a blue LED. The display apparatus controls the plurality of driving devices to adjust a current value that is supplied to at least one of the red LED, the green LED, or the blue LED, according to an image mode.

Described herein are systems, devices, and methods for a LED display including: at least one pixel, each pixel having three subchannels arranged in a triangular configuration; and a control system configured to actuate any one or more of a downsampling mode or a temporal scanning mode of the LED display. The subchannels can be arranged in a triangular configuration, with a height less than its width, and with a blue LED positioned below a red LED and a green LED.