Display Protection Circuit Using Switched Clock Signals for Short-Circuit Detection
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Solution Overview
Problem
Existing display technologies face challenges in effectively initiating short-circuit protection mechanisms due to difficulties in setting protection points, trace impedance issues, and signal interference from current limiting resistors, which hinder reliable short-circuit detection and prevention.
Innovation Solution
A protection circuit comprising a voltage level shifter, clock signal lines, and switches that provide a protection signal when short-circuited, coupled with a comparator circuit to generate a shutdown signal for the power supply, eliminating the need to set a protection point and reducing signal interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current limiting resistor solution is used, then pump load current can be limited, but resistance is relatively large and signal is easily affected
Solution Approach 1:
The patent introduces an n-channel transistor as an intermediary switching element between the clock signal source and the signal line. This transistor acts as a controlled mediator that can fully conduct or fully block current flow, replacing the passive current limiting resistor with an active switching device that maintains signal integrity while providing protection.
Solution Approach 2:
The patent replaces the passive electrical component (current limiting resistor) with an active electronic switching mechanism controlled by voltage levels. This substitution transitions from a continuous resistance-based current limitation to a discrete on/off switching system that preserves signal quality while achieving current control.
Data Source
AI summary
A protection circuit is disclosed, applied to a display apparatus. The display apparatus includes a voltage level shifter and a plurality of clock signal lines coupled to the voltage level shifter. The protection circuit includes a plurality of switches. At least one of the switches includes a control terminal, an input terminal, and an output terminal. The control terminal is coupled to a first clock signal line in the clock signal lines. The input terminal is coupled to a second clock signal line in the clock signal lines. The control terminal determines, according to a first clock signal provided by the first clock signal line, whether to conduct the input terminal and the output terminal, and the output terminal outputs a second clock signal provided by the second clock signal line. The output terminals of the switches are coupled to a node, and when the first clock signal line and the second clock signal line are short-circuited, the first clock signal and the second clock signal are pulled down as low-level signals, and the node outputs a protection signal.