Transformerless LED Display Driver Link Using LVDS
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Solution Overview
Problem
Large LED display panels face challenges in synchronously transmitting data to LED drivers due to the need for multiple gigabit Ethernet ports and transformers, which increases size, production costs, and introduces frame latency.
Innovation Solution
The implementation of a transformerless wire link and Low Voltage Differential Signaling (LVDS) connection between receivers and LED drivers, eliminating the need for transformers and reducing the number of gigabit Ethernet ports, and utilizing a transmitter with a pixel mapping table and DDR SRAM for efficient data packet transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gigabit Ethernet ports and transformers are used for data transmission, then reliable data transmission is achieved, but device size and production costs increase
Solution Approach 1:
The patent extracts and eliminates the transformer component from the data transmission system. By using a transformerless wire link architecture, the system removes the bulky transformer hardware while maintaining reliable data transmission through differential signaling, directly resolving the contradiction between transmission reliability and device size.
Solution Approach 2:
The patent replaces the mechanical/physical transformer component with an electrical solution using LVDS (Low Voltage Differential Signaling). This substitution eliminates the need for bulky magnetic components while achieving the same signal isolation and transmission reliability through electrical differential pairs.
2Productivity
If multiple gigabit Ethernet ports are used for data transmission, then data transmission capability is improved, but the number of components and production costs increase
Solution Approach 1:
The patent implements a universal LVDS communication interface that can handle all data transmission requirements between LED driver groups and receiver cards. This multi-functional interface replaces multiple specialized gigabit Ethernet ports, reducing component count while maintaining comprehensive data transmission capability for control signals, pixel data, and configuration information.
Solution Approach 2:
The patent merges multiple data transmission functions (pixel data, control signals, configuration data) into a single LVDS communication channel between each receiver card and LED driver group. This consolidation eliminates the need for separate gigabit Ethernet ports for each function, directly reducing device complexity while preserving productivity.
3Ease of operation
If memory is placed in receiver cards for pixel mapping, then pixel mapping function is achieved, but frame latency increases
Solution Approach 1:
The patent performs pixel mapping operations in advance within the transmitter before data is sent to receiver cards. By pre-processing and organizing pixel data according to the required mapping pattern, the system eliminates the need for additional memory-based mapping operations at the receiver端, thereby reducing frame latency while maintaining full pixel mapping capability.
Solution Approach 2:
The patent extracts the pixel mapping function from the receiver card and relocates it to the transmitter. This removal of memory requirements from the receiver card eliminates the time-consuming memory access and mapping operations that would otherwise occur during frame processing, directly reducing frame latency.
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
This solution enables a compact LED display panel design with reduced production costs and minimized frame latency, allowing for efficient data transmission and synchronization across a large number of LED drivers.
Implementation Method 1
The implementation of a transformerless wire link and Low Voltage Differential Signaling (LVDS) connection between receivers and LED drivers
Data Source
AI summary
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.