Drive Circuit Signal Superposition for Abnormality Detection
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Solution Overview
Problem
Existing drive circuits for electro-optical devices require multiple terminals and signal lines for control and abnormality determination, leading to increased complexity and potential errors in signal transmission.
Innovation Solution
A drive circuit that includes input and output terminals coupled to an external device, a drive signal generation circuit using synchronizing signals to drive an electro-optical panel, a state signal generation circuit to indicate the operating state, and a return signal generation circuit that superimposes the state signal on synchronizing signals for transmission back to the external device, reducing the need for additional terminals and allowing for error detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an abnormality determination unit is added to the driver circuit unit, then abnormality detection capability is improved, but the number of terminals and signal lines increases
Solution Approach 1:
The patent merges the state signal transmission function with the existing synchronizing signal transmission function by superimposing the state signal on the synchronizing signal. This allows the driver circuit to transmit both control signals and status information through the same signal line, thereby detecting abnormalities without adding new terminals or signal lines.
Solution Approach 2:
The synchronizing signal line is given multiple functions: it serves both as a control signal transmission path and as a status information return path. By making the signal line multi-functional, the patent eliminates the need for separate dedicated abnormality determination signal lines.
2Reliability
If separate signal lines are provided for control signals and abnormality determination signals, then signal transmission reliability is improved, but the connection complexity increases
Solution Approach 1:
The patent combines multiple signal transmission functions into a single signal line by superimposing the state signal on the synchronizing signal. This maintains signal transmission reliability through proper signal encoding while reducing connection complexity by eliminating redundant signal lines.
Solution Approach 2:
The synchronizing signal acts as an intermediary carrier that transports both control instructions and status information. By using the existing synchronizing signal as a mediator, the patent avoids creating separate dedicated signal paths while maintaining clear signal differentiation through superposition.
Data Source
AI summary
A drive circuit 1000 is provided with an input terminal and an output terminal configured to be coupled to an external device 2000; a drive signal generation circuit 400 configured to use a synchronizing signal that is input from the external device 2000 via the input terminal to perform signal generation processing to generate a drive signal that drives an electro-optical panel 10; a state signal generation circuit 510 configured to generate a state signal indicating an operating state of the drive signal generation circuit 400; a return signal generation circuit 520 configured to generate a return signal obtained by superimposing the state signal on the synchronizing signal; and the output circuit 2000 configured to output the return signal from output terminals 581 and 582 to the external device 2000.