High-Speed LED Array Light Signal Transmission
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Solution Overview
Problem
Conventional LED array displays face a tradeoff between switching speed and the number of I/O ports, leading to reduced refreshing frequency, and MIMO systems experience spatial crosstalk issues in wireless optical communication, limiting data transmission rates.
Innovation Solution
A light intensity signal transmitting device utilizing a high-speed LED array with a control board card that pre-codes signals and controls LEDs in a one-time scanning mode using row and column control lines, allowing for efficient multi-bit binary data transmission through precise analog-to-digital conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional row-by-row/column-by-column scanning strategy is used to reduce I/O port demand, then the number of I/O ports is reduced, but the refreshing frequency of the LED array is reduced
Solution Approach 1:
The patent pre-encodes the binary data into LED activation patterns before transmission. The control board pre-processes the information to be transmitted into a format that directly maps to LED configurations, allowing the LED array to transmit multi-bit data in a single activation cycle without requiring repeated scanning, thus maintaining high refreshing frequency while reducing I/O port demand.
Solution Approach 2:
The patent changes the control mode from sequential row-by-row or column-by-column scanning to a parallel activation mode where multiple LEDs are controlled simultaneously based on pre-encoded patterns. This parameter change in the control strategy allows the system to transmit multiple bits of data in one cycle, improving refreshing frequency while using fewer I/O ports.
2Ease of operation
If MIMO systems are used to relax alignment requirements, then alignment strictness is reduced, but spatial crosstalk occurs making demodulation difficult
Solution Approach 1:
The patent extracts and eliminates the spatial crosstalk problem by using a different transmission approach. Instead of relying on multiple spatial channels that are prone to crosstalk, the system uses a single LED array with pre-encoded patterns that transmit data through light intensity modulation, effectively removing the spatial crosstalk issue while maintaining relaxed alignment requirements.
Solution Approach 2:
The patent introduces light intensity modulation as an intermediary mechanism between the LED array and the photodetector. By encoding data in the intensity of light rather than relying on spatial multiplexing, the system avoids spatial crosstalk while maintaining ease of alignment, as the light intensity carries the encoded information directly to the receiver.
3Loss of information
If the number of LEDs in the LED array is increased to transmit more data, then data transmission capability is improved, but the switching speed tradeoff worsens
Solution Approach 1:
The patent pre-encodes the data into LED activation patterns before transmission, allowing the LED array to transmit multi-bit data in a single switching cycle. This preliminary encoding eliminates the need for repeated switching operations that would be required with conventional scanning methods, thus maintaining high switching speed while increasing data transmission capability through the use of multiple LEDs.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enhances data transmission rates by enabling high-bit light intensity signal transmission at the switching speed of a single LED, reducing the need for I/O ports and minimizing spatial crosstalk, thereby improving data transmission efficiency.
Implementation Method 1
a photodetector receives information transmitted by the LED array
Data Source
AI summary
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.