Display Panel Driving Circuit Communication Switching for Signal Isolation
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Solution Overview
Problem
In display devices, data reading failures occur due to interference from control signals between the timing controller and memory through a shared communication bus, leading to unreliable data retrieval and operation disorders.
Innovation Solution
A display panel driving circuit with a communication switching circuit that turns on or off based on a driving signal and reference voltage, allowing the timing controller to read memory data without interference from external control chips, and switches to communicate with external control chips when necessary for image display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the timing controller and memory connect through a shared communication bus, then the timing controller can read timing control data from the memory, but control signals from external control chips interfere with the data reading process, causing data reading failure
Solution Approach 1:
The communication path is segmented into two separate paths: one dedicated for timing controller-memory communication and another for external control chip communication. The communication switching circuit acts as a segment separator, directing signals to appropriate destinations based on timing control signals, thereby eliminating interference between the two communication streams.
Solution Approach 2:
The communication switching circuit serves as an intermediary device between the shared communication bus and the timing controller/memory interface. It mediates the signal flow by selectively connecting or disconnecting the timing controller from the communication bus based on operational mode, preventing control signals from external chips from reaching the memory interface during data reading operations.
2Adaptability or versatility
If the timing controller communicates with external control chips through the communication bus, then image display control signals can be received, but data reading from memory is blocked during communication operations
Solution Approach 1:
The communication switching circuit dynamically changes its connection state based on the timing controller's operational requirements. During initialization, it connects the timing controller to the memory for data reading; during normal operation, it connects the timing controller to the external control chip for receiving display control signals. This dynamic switching ensures both communication versatility and data reading reliability at different operational stages.
Solution Approach 2:
The communication switching circuit operates in periodic cycles: first enabling memory data reading during initialization phase, then switching to external control chip communication during normal display operation phase. This periodic switching pattern ensures that data reading occurs during dedicated time windows when the communication bus is free from external control signals.
3Device complexity
If a shared communication bus is used for both memory and external control chip connections, then device complexity is reduced, but signal interference causes data reading failure
Solution Approach 1:
The communication switching circuit acts as an intermediary that maintains the simplicity of using a shared communication bus while eliminating its harmful effects. It adds minimal circuitry complexity to enable reliable operation by selectively isolating the timing controller from external control signals during memory data reading operations.
Data Source
AI summary
The present application discloses a display panel driving circuit, and a display device. The circuit includes: a memory; a communication switching circuit; a timing controller including a data transmission port and a controlling port, the data transmission port connects to a communication signal output port of the communication switching circuit and a data output port of the memory, the controlling port connects to a driving signal input port of the communication switching circuit, a reference voltage input port connects to a driving power supply through a connector; wherein, the timing controller is configured to receive a communication signal accessed from the serial communication bus when the communication switching circuit is turned on, and to read software data of the memory when the communication switching circuit is turned off.