Display Panel Memory Write Protection Circuit Design
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Solution Overview
Problem
In display panels, software data stored in memory can be overwritten during power-on tests due to disturbances in the write protection signal, leading to reading errors and abnormal panel operations, as the existing write protection mechanisms are unreliable and prone to interference.
Innovation Solution
A write protection circuit comprising a timing controller, a memory, a power circuit, and a switching circuit, where the power circuit outputs a stable write protection signal to the memory, and the switching circuit is controlled by the timing controller to turn on only during data write instructions, ensuring the memory remains in a write-protected state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the write protection signal WP is provided by the computer through the serial communication unit, then the memory can be accessed for reading and writing during power-on tests, but the write protection signal is prone to disturbance and interference, causing software data to be overwritten
Solution Approach 1:
A switching circuit is introduced as an intermediary component between the computer and the memory. The switching circuit controls the connection state between them, allowing the memory to be accessible during power-on tests while preventing unauthorized write operations. The switching circuit acts as a mediator that enables read operations but blocks write operations unless explicitly permitted, thus solving the contradiction between accessibility and signal stability.
2Reliability
If the memory is left in write protection state during normal operation, then software data is protected from being overwritten, but the timing controller cannot update software data when needed
Solution Approach 1:
The write protection state of the memory is made dynamic rather than static. The switching circuit can change the connection state between the computer and memory based on operational requirements. During normal operation, the memory remains in write protection state to prevent overwriting. During power-on tests or authorized update operations, the switching circuit temporarily enables write access, thus providing both protection and adaptability.
3Device complexity
If the write protection signal is connected directly to the computer output, then the signal transmission is simple, but the signal is susceptible to interference from line length and high frequency
Solution Approach 1:
The switching circuit serves as an intermediary that buffers and controls the write protection signal transmission. Instead of a direct connection between the computer output and memory, the switching circuit is inserted in between. This intermediary component isolates the write protection signal from interference caused by long transmission lines and high-frequency noise, while maintaining signal integrity and control functionality.
Data Source
AI summary
The present application discloses a protection circuit for a memory in a display panel and a display panel. The circuit comprises a timing controller, a memory, a power circuit, and a switching circuit. Instead of having a computer provide a write protection signal to the memory to limit data in the memory from being overwritten, the power circuit provides a stable and reliable write protection signal to the memory, and then the timing controller controls the switching circuit to be turned on for grounding the write protection signal of the memory only when an instruction to write data to the memory is received.