Abstract: A method for programming and controlling of a plurality of slave devices serially connected in a daisy chain configuration using a master device includes assigning a unique slave address to each slave device in the plurality of slave devices by sending an initialization data packet from the master device serially through the plurality of slave devices; storing, in each of the plurality of slave devices, the assigned slave address; defining a data packet; and transmitting the data packet serially to one or more of the plurality of slave devices. The data packet has a target slave address, a read/write command, a start address, and optionally a register address and an increment value.

Abstract: An LED display panel contains an LED array having a plurality of LED pixels, a plurality of scan switches, and a plurality of LED columns. The anode of each LED pixel in each LED column is connected to a common anode node and the common anode node is connected to an output of a current source, while the cathode of each LED pixel in each LED column is switchably connected to a current sink via one of the plurality of scan switches. The common anode node is connected to a first input of a comparator circuit and is switchably connected to an anode voltage source. The second input of the comparator circuit is connected to a reference voltage source and an output of the comparator circuit signally controls a switch member that switchably connects the common anode node to the current sink.

Abstract: A 3D LED display panel that includes a substrate and an array light emitting devices mounted on the substrate. The array of light emitting devices includes a plurality of first light emitting devices and a plurality of second light emitting devices. Each first light emitting device has an LED chip/package electrically connected to the substrate and a piece of first circular polarizer attached to the LED chip/package. Likewise, each second light emitting device includes an LED chip/package electrically connected to the substrate and a piece of second circular polarizer attached to the LED chip/package. The first circular polarizer the second circular polarizer have opposite circular polarizations.

Abstract: An LED display device includes an LED array and a driver system thereof. The LED display device is configured so that LEDs in the LED array can switch between receiving scan signals at their anodes or receiving scan signals at their cathodes.

Abstract: An LED panel has an interleaved topology in which two adjacent LED rows in the LED panel are driven by different drivers. A delay time can be implemented between starting times two adjacent LED rows. Such an LCD panel can be employed to backlight an LCD panel in an LCD display. Implementing a delay time in driving the LED panel can reduce visual artifacts in the LCD display.

Abstract: The LED display system includes an array of LEDs and a driver circuit. The driver circuit has a PWM engine, an adder, an accumulator, a multiplier, and a frame butter. The multiplier multiplies an image data of a first bit depth (PWM) with a multiple (M) to produce an input data (PWM_M) having a second bit depth. The multiple has an integer section (MI) of one or more bit in length and a fraction section (MF) of one or more bit in length. The input data has an integer section (PWM_MI) and a fraction section (PWM_MF). The adder adds a value of PWM_MF of a current input data with a value of a remainder in an accumulator. The PWM engine receives PWM data from the frame buffer and generates PWM pulses to drive the LED array.

Abstract: An LED display system has and LED display panel coupled to a driver circuitry. The driver circuitry includes a scrambled PWM generator, a register, and a memory. The scrambled PWM generator receives an image data from an external source and, after certain compensations, is sent to a scramble PWM generator to be distributed according to a new set of rules that involves a compensation image data K. Image data K can be an empirical value or obtained according a formula using coefficients p and q, which can be obtained by calibration.

Abstract: An LED display system includes a driver chip and an LED array having m scan lines, n channels, and m scan switches. The driver chip includes an analog circuit and a digital controller that controls the analog circuit. The analog circuit has a plurality of power sources that are electrically connected to the LED array and provide a plurality of driving currents to the n channels of LEDs. Further, the n channels are divided into p groups and each group has q channels, p is an integer of 2 to n. Channels in each of the p groups receive a plurality of PWM signals. The starting times of the input PWM signals to at least two different groups among the p groups are different. Further, PMW signals to the channels in the same group may have a same starting time or may have different starting times.

Abstract: A method for motion blur in an LED display system includes the steps of connecting an LED display panel to a driver circuit; sending, from a transmitter, image data in a plurality of image frames at a predetermined frame rate and a predetermined refresh rate to the driver circuit, wherein each of the plurality of image frames has a frame time period (Tframe) comprising a plurality of refresh time periods (Trefresh); outputting a driving current in the driver circuit to drive the LED display; and turning off the driving current for a period of time (Tinactive). Tinactive bridges two adjacent frame time periods. The value of Tinactive can be determined according to a viewer of persistence of vision or by calibrating the LED display.

Abstract: A method for generating fractional PWM pulses to drive an light emitting device includes generating multiphase clock signals using a multiphase PLL or DLL includes the steps of generating a plurality of phases of PWM pulses that correspond to a number of phases of the multiphase clock signals, selecting two or more phases amongst the plurality of PWM pulses, performing logic operations of the selected phases of PWM pulses to generate fractional PWM pulses, and generating a driving current using the fractional PWM pulses in a current source. The light emitting device is can be an LED display comprising an LED array having a plurality of channels and a plurality of scan lines. The driving current drives LEDs in one of the plurality of channels.

Abstract: An LED display module contains a PCB, one or more layers of molding compound disposed on the surface of the PCB, a network of conductive tracks disposed on a surface of the one or more layer of molding compound away from the PCB, a plurality of through-holes extending through the one or more layers of molding compound, and an array of LED chips disposed in the one or more layers of molding compound. Each of electrodes on the LED chip is connected to one of the conductive pads via a conductive path. The conductive path comprises a conductive material inside one of the plurality of the through-holes and a portion of the network of conductive tracks.

Abstract: An LED display module includes an LED package having one or more layers of molding compound and containing an array of LED chips disposed therein, a plurality of conductive pads disposed on a surface of the LED package away from the array of LED chips, a network of conductive tracks connecting the array of LED chips with each other, and a plurality of conductive paths connecting the plurality of conductive pads and the network of conductive tracks. The network of conductive tracks includes a first layer of conductive tracks connecting the array of LED chips with each other, and a second layer of conductive tracks disposed substantially between the first layer of conductive tracks and the plurality of conductive pads.

Abstract: An LED display module contains a substrate, and an array of light emitting devices arranged in rows and columns on a substrate. Each light emitting device has a LED chip electrically connected to contact pads on the substrate, a black resin portion covering around the contact pad, and a transparent resin portion molded around the LED chip and the black resin portion. By forming the black resin portion around each metal pad, the LED display module provides an increased contrast ratio for the display surface.

Abstract: A monolithic Light Emitting Diode (LED) micro-display contains one or more modular LED arrays. The LED array uses quantum dot light conversion technology or Organic Light Emitting Diode (OLED). The micro-display has a spacing-saving topology and a direct current driver architecture. Its modular design is scalable, which allows manufacturing micro-displays of various sizes using the same module.

Abstract: An LED display device includes a transmitter having a memory and a pixel mapping table, a plurality of first receivers coupled to the transmitter, a plurality of second receiver modules, and a plurality of LED driver groups. A unique address is assigned to a data packet with a use of the pixel mapping table. The data packet has a set of field information and the set of field information includes the unique address. Each of the second receiver modules is coupled to at least one of the first receivers and includes a plurality of second receivers. None of the plurality of second receivers comprises a pixel mapping memory. Each of the LED driver groups is coupled to one of the plurality of second receivers and includes a plurality of LED drivers.

Abstract: An LED display system has an LED display panel coupled to a driver circuitry. The driver circuitry includes a scrambled PWM generator, a register, and a memory. The driver circuit receives an image data from an external source and, after certain compensations, the compensated data is sent to the scrambled PWM generator to be distributed according to a new set of rules. Compared with existing technologies, this LED display has a host of benefits, including having a uniform optical energy output at low brightness.

Abstract: A light emitting diode (LED) display module includes an array of surface-mount devices (SMDs) arranged in rows and columns on a substrate. Each SMD has red, green, and blue LED chips connected to the substrate and a first transparent resin portion molded around the LED chips; a black resin portion molded around each SMD in a manner to fill spaces between SMDs so as to block light emitted from a sidewall of each SMD; and a second transparent resin portion molded on the first transparent resin portion and the black resin portion.