Display Driver AC-Coupled Link Encoding for Low-Speed Data
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display devices with alternating current coupling capacitors face challenges in processing low-speed communication signals due to errors caused by alternating voltage levels, leading to abnormal data perception as the length of identical data bits increases.
Innovation Solution
Implementing a system with a communication line containing AC coupling capacitors that uses a direct current (DC) balance code, such as Manchester or 8B10B codes, for encoding low-speed communication signals, including a preamble signal to ensure balanced voltage levels and correct data perception, allowing for smooth transition to high-speed communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a general code (NRZ) is used to encode low-speed communication signals, then the encoding process is simple, but the source driver may not smoothly process the signal when identical data bits continue, leading to abnormal data perception
Solution Approach 1:
The patent changes the encoding parameters from general NRZ code to a specialized code designed for AC-coupled communication lines. This code ensures that the signal maintains proper voltage levels and transition characteristics even when identical data bits continue, thereby resolving the data perception accuracy issue while maintaining encoding simplicity through a systematic coding rule.
Solution Approach 2:
The patent introduces an intermediary encoding layer that translates data into a format suitable for AC-coupled communication. This intermediary code acts as a bridge between the data source and the AC-coupled transmission medium, ensuring proper signal characteristics are maintained throughout the communication process.
2Speed
If AC coupling capacitors are connected to communication lines for high-speed communication, then communication speed increases, but DC element in transmitted signals causes difference in common mode voltage levels between timing controller and source driver
Solution Approach 1:
The patent extracts and removes the DC element from the transmitted signal by using AC coupling capacitors in the communication line. This extraction of the DC component allows the signal to be transmitted without common mode voltage level mismatches, enabling high-speed communication while maintaining voltage level compatibility between the timing controller and source driver.
Solution Approach 2:
The patent employs periodic voltage transitions in the encoded signal to ensure that the AC coupling capacitors maintain proper charging states. The encoding scheme ensures regular voltage changes that prevent DC offset accumulation, thereby maintaining common mode voltage level matching during high-speed communication.
3Duration of action of stationary object
If the length of identical data bits in low-speed communication signal increases, then data transmission continuity is maintained, but the probability of source driver not perceiving data bits increases
Solution Approach 1:
The patent implements periodic voltage transitions in the encoded signal that occur at regular intervals regardless of the data content. This periodic action ensures that even when identical data bits continue for extended periods, the signal maintains proper transition characteristics that enable the source driver to accurately perceive each data bit, thereby maintaining both transmission continuity and perception accuracy.
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
Minimizes communication errors during low-speed communication by ensuring correct data bit perception and facilitates a seamless transition to high-speed communication, reducing data loss rates and improving reception performance.
Implementation Method 1
If an alternating current coupling capacitor (AC coupling capacitor) is connected to a communication line, it is possible to minimize a direct current (DC) element in a signal transmitted from the timing controller
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.