Light intensity signal transmitting device based on high-speed LED array

Patent metadata

Field	Value
Publication number	US-11695481-B2
Application number	US-202217689231-A
Country	US
Kind code	B2
Filing date	Mar 8, 2022
Priority date	Mar 9, 2021
Publication date	Jul 4, 2023
Grant date	Jul 4, 2023

Abstract

Disclosed is a light intensity signal transmitting device based on a high-speed LED array. The light intensity signal transmitting device includes an LED array and a control board card; through a novel arrangement and driving mode, the LED array has a high-speed modulation characteristic and can transmit high-bit light intensity information at the switching speed of single-point LEDs; the control board card performs high-speed display by gating an I/O port of the LED array, and is used as a light intensity signal transmitting end to transmit a light signal. According to the light intensity signal transmitting device, on the premise that the switching rate of the LED array is ensured, multi-bit binary data transmission is realized, and the transmission rate is improved.

First claim

What is claimed is:

1. A light intensity signal transmitting device based on an LED array, comprising the LED array and a control board card, wherein
a transmission signal is pre-coded and then stored in a memory of the control board card as a pre-coded transmission signal, the LED array is connected with the control board card, the control board card outputs a control signal to a row control end and a column control end of the LED array, to output, in a one-time scanning mode, a pattern corresponding to the pre-coded transmission signal, thereby implementing transmission through light signals;
a photodetector receives information transmitted by the LED array, when a number of LEDs in the LED array is 2 n , any n-bit binary data from 0 to 2 n LEDs can be transmitted, and signals output by the photodetector pass through an analog-to-digital converter to recognize a number of lightened LEDs, thereby realizing data transmission,
wherein the LED array is controlled by row control lines and column control lines in a gating mode, a number of LEDs required to be lightened in the LED array is controlled in the one-time scanning mode, and response time of the LED array is equal to response time of a single LED,
in an arrangement mode of the LED array, when a row with a largest number of LEDs with anodes connected together or LEDs with cathodes connected together is a central row, a number of LEDs with anodes connected together of LEDs with cathodes connected together in each row of other rows is gradually decreased to one towards an edge; and
when a column with a largest number of LEDs with anodes connected together or LEDs with cathodes connected together is a central column, a number of LEDs with anodes connected together or LEDs with cathodes connected together in each column of other columns is gradually decreased to one towards an edge.

2. The light intensity signal transmitting device based on the LED array according to claim 1 , wherein gradually decreasing is to decrease gradually with a tolerance of 1 or 2;
when the number of the LEDs is gradually decreased with a tolerance of 1 from the central row or the central column, a gradual decreasing direction is from the central row or the central column towards two sides or only towards a single side; and
when the number of the LEDs is gradually decreased with a tolerance of 2 from the central row or the central column, the number of the LEDs in the central row or the central column is an odd number, and a gradual decreasing direction is from the central row or the central column towards two sides.

3. The light intensity signal transmitting device based on the LED array according to claim 1 , wherein the LEDs with anodes connected together or LEDs with cathodes connected together in the LED array are arranged other than horizontally or vertically.

4. The light intensity signal transmitting device based on the LED array according to claim 2 , wherein the LED array is in a convex polygon shape, and any number of LEDs is lightened in the LED array.

5. The light intensity signal transmitting device based on the LED array according to claim 4 , wherein the LED array is square, triangular or parallelogram-shaped.

Assignees

• Univ Beihang

Inventors

• Sun Mingjie
• Wang Han
• Li Kuijun
• Huang Hongxu
• Chen Wen
• Li Lijing

Classifications

• F21Y2115/10

  Light-emitting diodes [LED] · CPC title

• F21V23/002

  Arrangements of cables or conductors inside a lighting device, e.g. means for guiding along parts of the housing or in a pivoting arm · CPC title

• H04B10/502 Primary

  LED transmitters · CPC title

• H04B10/69

  Electrical arrangements in the receiver · CPC title

• H04B10/116

  Visible light communication · CPC title