Source Driver Latch Circuit to Prevent Signal Race and Hazard
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Solution Overview
Problem
Existing source drive circuits in display devices face challenges in efficiently latching and transmitting data signals due to signal race and hazard issues, leading to unstable potentials and impaired data writing to pixel units.
Innovation Solution
A latch circuit comprising two cascaded latch circuits connected via a transmission node, where one latch operates under control of two control signal terminals and the other under two switch signal terminals, with a loop in the second latch circuit turned off in response to the data signal, preventing signal interference and ensuring normal data writing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single latch circuit is used to latch and transmit data signals, then the device complexity is reduced, but signal race and hazard occur leading to unstable potentials
Solution Approach 1:
The latch circuit is divided into two separate latch circuits (first latch circuit and second latch circuit) that operate in sequence. The first latch circuit latches the data signal under control of a first pulse control signal, then transfers it to the second latch circuit which latches it under control of a second pulse control signal. This segmentation prevents signal race and hazard conditions while maintaining circuit functionality.
2Reliability
If a loop is maintained in the second latch circuit for signal latching, then the latching function is improved, but signal interference occurs impairing normal data writing
Solution Approach 1:
The loop in the second latch circuit is turned off in advance (before data writing) to prevent signal interference. By proactively disabling the feedback loop before the data signal is written to the second latch node, the circuit avoids the harmful effects of signal circulation and interference, ensuring clean data writing while maintaining latching capability when needed.
Data Source
AI summary
Provided are a latch and a drive method thereof, a source drive circuit and a display device. The latch includes: a first latch circuit and a second latch circuit; the first latch circuit is connected to a first control signal terminal, a data signal terminal and a transmission node, and is configured to latch a data signal from the data signal terminal at a first latch node and transmit the data signal to the transmission node; and the second latch circuit is connected to the transmission node, a first switch signal terminal, a second switch signal terminal and an output node, and is configured to latch a data signal from the transmission node at a second latch node and output the data signal to the output node; a loop in the second latch circuit is turned off in response to the data signal written to the second latch node.