US 11,232,742 B2 · Method and apparatus for reducing LED panel inter-channel interference

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.

Claims15

Dependent claims

A method for driving an LED array, wherein the LED array comprises m scan lines, n channels, and m×n number of LED pixels, the method comprising:

dividing the n channels into p groups, each of the p groups has q channels, wherein n=p×q;
and
inputting a plurality of PWM signals into the p groups so that each group receives one or more PWM signals, wherein at least two among the plurality of PWM signals have different starting times,
wherein each scan line connects n LED pixels, each of the n LED pixels is disposed in one of the n channels,
wherein each channel connects m LED pixels, each of the m LED pixels is disposed in one of the m scan lines, and
wherein n and m are integers larger than one.

3 more elements

An LED display system, comprising a driver chip and an LED array having m scan lines, n channels, and m scan switches, and n×m number of LED pixels, wherein:

each scan line connects n LED pixels, each of the n LED pixels is disposed in one of the n channels,
each channel connects m LED pixels, each of the m LED pixels is disposed in one of the m scan lines,
each scan switch is electrically connected to one of the m scan lines, and
n and m are integers larger than one,
the driver chip comprises an analog circuit and a digital controller that controls the analog circuit, the analog circuit comprises 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 LED pixels according a plurality of PWM signals from the digital controller,
n channels are divided into p groups and each group has q channels, p is an integer of 2 to n, all q channels in a same group are connected to a same power source among the plurality of power sources, and, during operation,
at least two among the plurality of PWM signals have different starting times.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application

17/202,848Filed 16 Mar 2021 · us provisional application

Priority

16 Mar 2020

Published

US 2021/0287601 A116 Sep 2021

Granted

25 Jan 2022

Term ends

Not estimatedThe source records don’t support an estimate.

Classification11 codes

G09G 3/2003
For presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged…:…
G09G 3/32
Using electroluminescent panels: semiconductive, e.g. using light-emitting diodes [LED]
G09G 3/2014
Display of intermediate tones: by modulation of the duration of a single pulse during which the logic level remains constant
G09G 2310/0267
Details of driving circuits: details of drivers for scan electrodes, other than drivers for liquid crystal, plasma or OLED displays

Method and apparatus for reducing LED panel inter-channel interference

Life of this patent

Method and apparatus for reducing LED panel inter-channel interference

Life of this patent

Abstract

Claims15