TDDI Circuit Status Signal Synchronization
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Solution Overview
Problem
Current touch and display driver integration (TDDI) circuits malfunction due to premature signal transmission to the touch circuit before it reaches a normal operating status, leading to operational issues.
Innovation Solution
A TDDI circuit design where the touch circuit generates a status signal indicating its operational status, and the display driver circuit transmits signals only when the touch circuit is fully operational, including a reset mechanism and abnormal detection to prevent malfunctions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the display driver circuit transmits signals to the touch circuit before it enters normal operating status, then the signal transmission timing is improved, but the touch circuit cannot operate correctly causing malfunction
Solution Approach 1:
The touch circuit performs preliminary initialization actions and generates a status signal indicating its operational readiness before the display driver circuit transmits signals. This preliminary action ensures the touch circuit is prepared to receive and process signals correctly, preventing malfunction while maintaining efficient signal transmission timing.
Solution Approach 2:
The touch circuit generates a status signal that provides feedback to the display driver circuit about its operational status. The display driver circuit uses this feedback to determine the appropriate timing for signal transmission, ensuring signals are sent only when the touch circuit is ready, thus maintaining both transmission efficiency and operational reliability.
2Reliability
If the display driver circuit waits for touch circuit status before transmitting signals, then the touch circuit operation reliability is improved, but the signal transmission timing is delayed
Solution Approach 1:
The touch circuit performs preliminary initialization and generates a status signal in advance, allowing the display driver circuit to transmit signals immediately upon receiving the status indication without prolonged waiting. This preliminary action reduces transmission delay while ensuring reliability.
Solution Approach 2:
The status signal provides real-time feedback about touch circuit readiness, enabling the display driver circuit to transmit signals as soon as the touch circuit is prepared. This feedback mechanism minimizes waiting time while maintaining reliable operation by ensuring signals are transmitted at the optimal moment.
3Measurement precision
If the display driver circuit continuously monitors status signal, then the abnormal detection capability is improved, but the circuit complexity increases
Solution Approach 1:
The status signal provides continuous feedback about touch circuit operational status with minimal additional circuitry. The display driver circuit monitors this single status signal to detect abnormalities, achieving precise abnormal detection capability while avoiding excessive circuit complexity through efficient use of the feedback mechanism.
Solution Approach 2:
The status signal serves multiple functions: indicating normal operation, signaling initialization completion, and alerting to abnormal conditions. This multi-functionality allows comprehensive monitoring and abnormal detection without requiring separate dedicated circuits for each function, thus maintaining circuit simplicity while improving detection capability.
Data Source
AI summary
The present invention discloses a touch and display driver integration circuit, which includes a touch circuit and a display driver circuit. The touch circuit generates a status signal standing for the status of the touch circuit. The display driver circuit is coupled to the touch circuit and transmits at least one signal and/or at least one information to the touch circuit according to the status signal so as to drive the touch circuit.