Display Memory ECC Recovery for Electrostatic Discharge Faults
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Solution Overview
Problem
Display devices are susceptible to soft fails and contamination of internal memory due to electrostatic discharge, which can lead to errors in IC driving information stored in internal memory devices.
Innovation Solution
A display device design that includes an external memory device on a printed circuit board to store initial IC driving information, an internal memory device to generate and store a copy of this information, a buffer to detect electrostatic discharge, and an error correction code calculator to compare checksum values of the information before and after discharge, updating the internal memory with the original information if discrepancies are found.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If IC driving information is stored in internal memory device, then data access speed is improved, but vulnerability to electrostatic discharge contamination increases
Solution Approach 1:
The patent implements a dual memory structure where IC driving information is stored in both external memory device and internal memory device. The external memory serves as a clean backup copy, while the internal memory provides fast access. When electrostatic discharge contaminates the internal memory, the system can detect the corruption and retrieve clean data from the external memory copy, thus resolving the contradiction between fast access and data integrity.
Solution Approach 2:
The patent introduces an error correction code calculator and comparator as intermediary components between the internal and external memory devices. These intermediaries detect and correct data corruption by comparing error correction codes from both memory sources, acting as a mediator that protects the fast internal memory from electrostatic discharge contamination while maintaining quick data access capability.
2Reliability
If error correction code comparison is implemented between internal and external memory, then data integrity is improved, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing error correction codes in both internal and external memory devices before data transfer or access operations. This allows for rapid comparison and verification without adding complex real-time calculation circuits, thus improving data integrity while minimizing the increase in device complexity.
Solution Approach 2:
The error correction code calculator and comparator operate autonomously to detect and correct data corruption. The system self-verifies data integrity by comparing ECC values from internal and external memory without requiring complex external intervention or control logic, thereby improving reliability with minimal added complexity.
Data Source
AI summary
A display device includes an external memory device which stores a first integrated circuit (“IC”) driving information, an internal memory device which stores a second IC driving information generated by copying the first IC driving information, a buffer which receives the second IC driving information and detects an electrostatic discharge current, an error correction code calculator which determines a first error correction code of the first IC driving information and a second error correction code of the second IC driving information when the electrostatic discharge current is detected, and an error correction code comparator which compares the first error correction code and the second error correction code. The internal memory device selectively updates the second IC driving information to the first IC driving information based on a result of a comparison of the first error correction code and the second error correction code.