Gateway Unit for Display Control Bus Signal Collision Avoidance
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Solution Overview
Problem
Current display control circuits for liquid crystal display panels face complexity and difficulty in avoiding signal collisions on the control bus, especially when multiple processors are involved, such as during product inspection.
Innovation Solution
A display control circuit with a gateway unit that enables or disables instruction data output to the control bus based on a control input signal, allowing the internal and external processors to operate without signal collisions by temporarily disabling internal processor output during product inspection and enabling it afterwards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an internal processor is added to the driver control circuit to provide versatility in operation settings, then the adaptability of the display control circuit is improved, but the device complexity increases due to the need for double master control on the I2C bus
Solution Approach 1:
The gateway unit acts as an intermediary between the internal processor and the I2C bus. It mediates access to the bus by receiving control signals from the external processor and selectively enabling or disabling internal processor access to the bus, thereby simplifying the double master control mechanism while maintaining versatility
Solution Approach 2:
The gateway unit dynamically changes the operational state of the internal processor's access to the I2C bus based on external control signals. During product inspection, it disables internal processor access; during normal operation, it enables access, thus adapting the system behavior to different operational modes without increasing control complexity
2Ease of operation
If both internal and external processors simultaneously access the control bus for product inspection, then the ease of operation is improved, but signal collision occurs on the control bus
Solution Approach 1:
The gateway unit performs preliminary action by preemptively disabling the internal processor's access to the I2C bus when receiving a control signal from the external processor. This prevents signal collision before it can occur, ensuring reliable product inspection operations while maintaining ease of operation
Data Source
AI summary
A display control circuit includes a driver circuit DR which drives a plurality of pixels, and a driver control circuit which controls the driver circuit. The driver control circuit includes a control bus which transfers instruction data, an operation setting unit which executes operation settings in accordance with the instruction data from the control bus, and a gateway unit provided for a case in which the instruction data is internally generated and output to the control bus, and is capable of enabling or disabling an instruction data output to the control bus in accordance with a control input signal.