Scan Drive Short-Circuit Detection to Protect Scan Chip Output
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Solution Overview
Problem
The increasing density and proximity of signal lines in high-resolution displays lead to a higher probability of short circuits between scan lines, which can result in the burnout of the scan chip due to the conduction of high and low-level voltage signals.
Innovation Solution
A detection circuit comprising a comparison circuit and a determination circuit is introduced, where the comparison circuit generates an intermediate signal based on the scan output signal and low-level voltage signal, and the determination circuit produces a control signal to cut off the scan chip's output when a short circuit is detected, preventing burnout.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If signal lines are made thinner and spaced closer to achieve high PPI, then display resolution is improved, but the probability of short circuit between signal lines increases
Solution Approach 1:
The patent implements a detection circuit that proactively monitors scan line voltages before a short circuit can cause damage. The comparison circuit continuously compares the voltage on each scan line with a reference voltage, and when a short circuit is detected (voltage deviation beyond threshold), the determination circuit immediately generates a control signal to cut off the scan chip output, preventing burnout before it occurs.
Solution Approach 2:
The patent introduces a detection circuit as an intermediary system between the scan chip and the potential short circuit hazard. This detection circuit includes a comparison circuit that uses a reference voltage as a mediator to detect abnormal voltage conditions on scan lines, and a determination circuit that acts as an intermediary decision-making unit to trigger protective actions when short circuits are detected.
2Reliability
If a detection circuit is added to prevent short circuit damage, then scan chip reliability is improved, but device complexity increases
Solution Approach 1:
The detection circuit is segmented into two independent functional modules: a comparison circuit that performs voltage comparison operations, and a determination circuit that makes protection decisions. This segmentation allows each module to be optimized independently and simplifies the overall system architecture, making the complex protection function more manageable and maintainable.
Data Source
AI summary
A detection circuit and a scan drive circuit are provided. The detection circuit includes a comparison circuit and a determination circuit. The comparison circuit is configured to receive a low-level voltage and a scan output signal output from an nth level buffer, and generate a first intermediate signal according to the scan output signal and the low-level voltage signal. The determination circuit is configured to receive the first intermediate signal and the scan output signal of the nth level buffer output from the output terminal of the nth level buffer in the scan chip, and generate a control signal according to the first intermediate signal and the scan input signal, and output the control signal to the scan chip to control the scan chip to cut off output when a short circuit occurs.