Protection Signal Circuit Using Edge Detection and Flip-Flop Feedback
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Solution Overview
Problem
Current protection signals for thin film transistor liquid crystal displays (TFT-LCDs) are vulnerable to external interference, risking erroneous software writing or rewriting of data in chips.
Innovation Solution
A circuit comprising a first and second flip-flop and a feedback device generates a protection signal by detecting preset level changes in an external signal, ensuring secure writing and reading operations by controlling the enabling signal, utilizing rising-edge and falling-edge triggered D flip-flops and insulated gate field effect transistors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a protection signal is logically controlled by directly inputting high/low levels from the outside, then the control is simple and direct, but the software data in the chip has the risk of being rewritten when the machine is incorrectly set or is interfered by the outside
Solution Approach 1:
The patent applies preliminary action by pre-configuring the protection signal generation circuit with flip-flops and logic gates that automatically generate protection signals based on external signal edge detections. The system performs the protection function in advance through circuit design rather than relying on simple external level inputs, preventing software rewriting before it can occur.
Solution Approach 2:
The patent implements feedback by using the output of the second flip-flop to control the enabling signal that feeds back to the first flip-flop. This feedback mechanism ensures that the protection signal is generated only under specific conditions (edge detections), creating a self-regulating system that enhances software protection while maintaining controlled operation.
2Reliability
If a protection signal circuit using flip-flops and feedback devices is implemented, then the software protection is enhanced, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the protection signal generation into distinct functional modules: a first flip-flop for receiving external signals, a second flip-flop for generating the protection signal, and a feedback device for controlling the enabling signal. This modular segmentation makes the complex circuit more manageable and easier to implement while maintaining enhanced software protection.
Data Source
AI summary
A circuit for generating a protection signal and a protection apparatus are provided. The circuit includes: a first flip flop, wherein the first flip flop is configured for receiving an enabling signal and an external signal input to the first flip flop and outputting a first level according to the enabling signal and the external signal; a second flip flop, wherein the second flip flop is in connection with the first flip flop and the second flip flop is configured for outputting a protection signal according to the first level and the external signal; and a feedback device, wherein the feedback device is connected between an output terminal of the second flip flop and an input terminal of the first flip flop and the feedback device is configured for outputting the enabling signal.