Display Write Protection Circuit Using Intermediary Signal Conversion
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Solution Overview
Problem
Existing streamline devices capable only of outputting high or low potentials cannot effectively enable or disable write protection for chips in display apparatuses during production and daily use, limiting compatibility and increasing reconstruction costs.
Innovation Solution
A circuit with a connection module, adjustment module, and write protection module that uses control signals of high and low potentials to control the switches, allowing both high and low potential devices to implement write protection functions, enabling software writing and protection states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a streamline device only capable of outputting high potential or low potential is used, then device complexity is reduced, but write protection control function is lost
Solution Approach 1:
The patent introduces an intermediary circuit on the PCB board that mediates between the limited streamline device (capable of only high or low potential output) and the chip requiring write protection control. This intermediary circuit receives the single-potential control signal from the streamline device and internally generates both high and low potential signals through voltage division and switching mechanisms, thereby enabling full write protection control functionality without requiring the streamline device itself to be complex
Solution Approach 2:
The circuit design enables the system to generate its own complementary signals internally. When the streamline device outputs a high potential signal, the circuit automatically generates the corresponding low potential signal through resistor voltage division and switch control, and vice versa. This self-service mechanism eliminates the need for the external streamline device to provide both high and low potential signals, reducing device complexity while maintaining control capability
2Reliability
If write protection is enabled during daily use, then chip data security is improved, but software writing capability during production is lost
Solution Approach 1:
The patent implements dynamic write protection control through switches that can change state based on control signals. During production, the streamline device sends control signals that open the switches, disconnecting the write protection mechanism and enabling software writing. During daily use, the switches are closed to enable write protection. This dynamic switching capability allows the system to adapt between contradictory requirements of data security and software writing capability at different operational stages
Solution Approach 2:
The circuit is designed with preliminary control mechanisms where the streamline device sends control signals in advance to switch between write protection and software writing modes before actual operations. During production, write protection is preliminarily disabled through control signals, and during daily use, it is preliminarily enabled, ensuring the system is in the correct state before critical operations occur
Data Source
AI summary
A drive circuit includes: a connection module, including a first and a second interfaces for receiving a control signal; an adjustment module, including: a first switch, a control end thereof is coupled to the first interface, a first end is coupled to a supply voltage, and a second end is coupled to a first resistor; second switch, a control end thereof is coupled to the second interface, a first end is coupled to a second resistor, and a second end is grounded; and a third resistor, coupled to the first and the second switches; and a write protection module coupled to the second end of the second switch, and including a software written and a write protection states, where the first and the second switches are controlled to be open or closed by using the control signal, to control the working states of the write protection module.