Display Driver AC-Coupled Link Using DC-Balanced Low-Speed Coding
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Solution Overview
Problem
Display devices with alternating current coupling capacitors face challenges in processing low-speed communication signals due to errors caused by voltage level inconsistencies, leading to abnormal data perception as the length of identical data bits increases.
Innovation Solution
Implementing a system with a communication line comprising alternating current coupling capacitors that uses a direct current balance code, such as Manchester or 8B10B code, for encoding low-speed communication signals, including a preamble signal to ensure balanced voltage levels and correct data perception, and a decoder to set up a high-speed communication environment based on configuration data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a general code (NRZ) is used for encoding low-speed communication signals, then the encoding process is simple, but the source driver cannot smoothly process the signal when identical data bits continue, leading to abnormal data perception
Solution Approach 1:
The patent changes the encoding parameter from general NRZ code to DC balance code (such as Manchester code or 8B10B code). This parameter change ensures that the encoded signal maintains balanced voltage levels, preventing the accumulation of DC components that cause perception errors in low-speed communication through AC coupling capacitors.
Solution Approach 2:
The patent introduces a DC balance code as an intermediary encoding scheme between the data source and the AC coupling capacitor. This intermediary code structure ensures that the signal characteristics are compatible with AC coupling, preventing direct current components from causing voltage level shifts that would lead to data perception errors.
2Speed
If an AC coupling capacitor is used in the communication line, then high-speed communication is enabled, but voltage level inconsistencies occur during low-speed communication, causing communication errors
Solution Approach 1:
The patent changes the signal encoding parameter to DC balance code, which fundamentally alters the voltage level characteristics of the transmitted signal. This parameter change ensures that the signal maintains balanced positive and negative voltage levels, making it compatible with AC coupling capacitors and preventing voltage level inconsistencies during low-speed communication.
Solution Approach 2:
The patent applies the principle of equipotentiality by ensuring that the encoded signal maintains balanced voltage levels around a reference potential. The DC balance code ensures that the average voltage level remains stable, preventing DC component accumulation that would cause potential shifts across the AC coupling capacitor, thereby maintaining communication reliability.
3Productivity
If the length of identical data bits increases in a low-speed communication signal, then the data transmission capacity is maintained, but the probability of abnormal data perception increases
Solution Approach 1:
The patent changes the encoding parameter to DC balance code, which fundamentally alters how data bits are represented. In codes like Manchester code, each data bit is represented by a transition (rising or falling edge), ensuring that voltage levels change regularly regardless of how many identical data bits continue. This parameter change eliminates the accumulation effect that occurs with NRZ encoding when identical bits are transmitted consecutively.
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 approach minimizes communication errors during low-speed communication by ensuring balanced voltage levels and correct data perception, allowing for a seamless transition to high-speed communication with reduced data loss rates.
Implementation Method 1
a communication line comprising at least one alternating current coupling capacitor
Data Source
AI summary
The present disclosure relates to a data driving device, a data processing device, and a system for driving a display device and, more particularly, it relates to a data driving device, a data processing device, and a system for smoothly performing a low-speed communication through a communication line including an alternating current coupling capacitor.