LED Driver Clock Data Signal Merging
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Solution Overview
Problem
In LED display systems, the separate transmission of clock and data signals through different paths can lead to sampling issues due to potential mismatches in transmission paths, causing loss of sampling time and affecting the accuracy and stability of data sampling.
Innovation Solution
An LED driver is proposed that embeds a clock signal into the data signal through encoding, eliminating the need for separate clock signal transmission between stages, using decoding and encoding circuits to recover the clock and data signals, thereby reducing hardware requirements and potential path mismatches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate clock signal line and data signal line are used between cascaded LED drivers, then reliable clock synchronization can be achieved, but hardware complexity and wiring requirements increase
Solution Approach 1:
The patent combines the clock signal and data signal into a single transmitted signal. The encoding circuit modulates the clock signal onto the data signal carrier, allowing both signals to be transmitted through the same channel. The decoding circuit then separates and recovers both signals, eliminating the need for separate physical transmission lines while maintaining synchronization reliability.
Solution Approach 2:
The single signal line between cascaded LED drivers serves multiple functions: it simultaneously transmits both clock and data information. This multi-functional approach replaces the traditional separate dedicated lines, reducing hardware complexity while maintaining the necessary signal integrity for reliable operation.
2Measurement precision
If separate clock signal line and data signal line are used between cascaded LED drivers, then accurate data sampling can be ensured, but wiring requirements and electromagnetic interference increase
Solution Approach 1:
By merging the clock and data signals into a single transmitted signal, the patent reduces the number of separate transmission lines. This consolidation minimizes the total electromagnetic radiation sources and reduces crosstalk between adjacent lines, thereby lowering electromagnetic interference while preserving sampling accuracy through proper signal encoding and decoding.
3Productivity
If encoding and decoding circuits are implemented, then signal transmission efficiency improves, but device complexity increases
Solution Approach 1:
The encoding circuit generates the modulated signal containing both clock and data information, and the decoding circuit automatically extracts and recovers these signals. The system serves itself by using the transmitted signal as both carrier and information source, eliminating the need for separate dedicated clock lines and reducing overall system complexity despite the addition of encoding/decoding functions.
Data Source
AI summary
A light-emitting diode LED driver and a LED driving device including the LED driver are provided. The light-emitting diode LED driver includes a decoding circuit that receives a data signal and decodes the data signal to generate display data used to drive LEDs to emit light and display and a recovered clock signal. Further provided is an encoding circuit that encodes the decoded display data by using the recovered clock signal to generate an encoded data signal, where the data signal is encoded in a first encoding format, and the encoded data signal is encoded in a second encoding format.