Source Driver Bit Error Detection Using Test Data Periodicity
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Solution Overview
Problem
As display panel resolution and size increase, signal interference and delay can lead to bit errors in display driving devices, making it difficult to determine if a source driver is operating abnormally, which can affect signal transmission and reception.
Innovation Solution
A display driving device that includes a timing controller generating test data with predetermined periodicity to evaluate the source driver's performance, and a source driver that measures bit error rates by detecting aperiodicity in the test data, with multiple source drivers connected through a shared back channel to identify abnormal conditions based on identification information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple source drivers are connected through a shared back channel, then device complexity is reduced, but it becomes difficult to identify which specific source driver is experiencing abnormal conditions
Solution Approach 1:
The patent segments the identification process by assigning unique identification information to each source driver. When a bit error occurs, the timing controller transmits test data that includes identification information corresponding to the specific source driver, enabling individual identification even within a shared back channel configuration.
Solution Approach 2:
The patent implements feedback by having the timing controller transmit test data with identification information back to the source drivers through the shared back channel. The source driver that detects a bit error in the test data can then identify itself by transmitting its unique identification information, creating a feedback loop that resolves the identification problem.
2Measurement precision
If test data with predetermined periodicity is used, then measurement precision of bit error rate is improved, but signal delay and electromagnetic wave interference still cause errors
Solution Approach 1:
The patent applies preliminary action by having the timing controller proactively transmit test data with predetermined periodicity to source drivers before normal operation. This allows the system to pre-identify and measure bit errors in source drivers under controlled conditions, establishing a baseline for detecting abnormalities during actual operation.
Solution Approach 2:
The patent uses preliminary anti-action by transmitting test data designed to detect and correct potential bit errors before they affect normal display operation. The predetermined periodicity of the test data creates a pattern that makes it easier to detect and correct errors caused by electromagnetic wave interference and signal delay.
Data Source
AI summary
A display driving device includes a timing controller configured to generate test data having a predetermined periodicity, and a source driver configured to drive source lines of a display panel using the test data, determine that a bit error has been generated when aperiodicity appears in the test data, and measure a bit error rate (BER) based on the bit error.