Display Timing Data Protection Switcher Circuit
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Solution Overview
Problem
The existing data protection systems for display apparatuses are prone to incorrect write protection states due to interference, leading to abnormal display images and frequent errors, as the write protect signal can be invalidated by line materials or other interference, causing the control data in EEPROM to be rewritten.
Innovation Solution
A data protection system that includes a memory with a protection control end and a TCON connected to it, along with a switcher that selectively outputs a constant potential signal and a read/write control signal to the protection control end based on the potential change of the control signal, disconnecting the electrical coupling between the read/write control signal and the protection control end when the constant potential signal is transmitted, thereby maintaining the timing control data in a write-protected state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the WP signal is kept at high potential to maintain write protection, then the control data in EEPROM is protected from rewriting, but line materials or interference may invalidate the WP signal, causing incorrect write protection states
Solution Approach 1:
The patent introduces a switcher circuit as an intermediary between the TCON and the EEPROM's WP pin. This switcher actively manages the electrical coupling between the read/write control signal and the protection control end, isolating the EEPROM from external interference while maintaining reliable write protection control through the controlled coupling mechanism.
2Ease of operation
If the TCON reads control data from EEPROM during initialization, then the TCON can be properly configured, but the act of reading may trigger unintended write operations due to invalid WP signal
Solution Approach 1:
The patent implements preliminary action by establishing the controlled electrical coupling mechanism before the TCON reads control data from EEPROM. The switcher is configured to ensure the WP signal remains valid during the initialization process, preventing unintended write operations before they can occur.
3Adaptability or versatility
If the EEPROM is continuously connected to the read/write control signal, then data can be freely read and written, but incorrect write protection states cause abnormal display images and frequent errors
Solution Approach 1:
The patent applies dynamics by making the electrical coupling between the read/write control signal and the protection control end controllable rather than static. The switcher dynamically adjusts the coupling state based on the control signal, enabling the system to switch between read-protected and write-protected states as needed, thereby maintaining both data accessibility and protection when required.
Data Source
AI summary
This application relates to a data protection system and protection method of a display apparatus, and the system comprises a memory, a TCON, and a switcher. The switcher selectively outputs a constant potential signal and a read/write control signal to a memory according to a potential change of a control signal. When the switcher transmits and outputs the constant potential signal to the memory, the switcher disconnects an electrical coupling between the read/write control signal and a protection control end. The memory maintains timing control data to be write-protected according to the obtained signal, or switches the timing control data to be readable-and-writable or write-protected.