Display Voltage Generator Shutdown for Short-Circuit Protection
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Solution Overview
Problem
Existing display devices lack effective protection mechanisms for the voltage generator when a short circuit occurs in the power line, which can lead to damage and malfunction.
Innovation Solution
Incorporating a short circuit protection part that compares the output voltage of the voltage generator with reference voltages and outputs a shutdown signal when the voltage level falls below a predetermined threshold, thereby protecting the voltage generator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a voltage generator is used to supply operating voltage to pixels through a power line, then the display device can operate normally, but the voltage generator is vulnerable to damage when a short circuit occurs in the power line
Solution Approach 1:
The patent implements preliminary protection actions by monitoring the output voltage of the voltage generator before damage can occur. A monitoring circuit continuously detects voltage levels and compares them against reference values to identify short circuit conditions in advance, triggering a shutdown signal to prevent generator damage before it happens.
Solution Approach 2:
The patent employs feedback mechanisms where the monitoring circuit continuously measures the output voltage of the voltage generator and feeds this information back through a comparison circuit. When the feedback signal indicates a voltage level consistent with a short circuit, the system automatically responds by shutting down the voltage generator, creating a closed-loop protection system.
2Duration of action of stationary object
If the voltage generator operates continuously to maintain display functionality, then image display is uninterrupted, but the voltage generator remains exposed to short circuit damage risks
Solution Approach 1:
The monitoring and comparison circuits create a continuous feedback loop that tracks voltage generator output in real-time. This feedback system enables the generator to operate continuously under normal conditions while automatically detecting and responding to short circuit conditions, balancing continuous operation with protective shutdown capability.
Solution Approach 2:
The patent introduces intermediary protection circuits (monitoring circuit and comparison circuit) that act as mediators between the voltage generator and the potential short circuit conditions. These intermediary circuits detect harmful conditions and transmit shutdown signals to protect the generator without requiring direct intervention in the power delivery path.
Data Source
AI summary
Disclosed is a display device which includes a voltage generator including a first converter that generates a first voltage using an input voltage and is shut down in response to a shutdown signal and a short circuit protection part including a first short circuit protection part that compares an output voltage of an output terminal of the first converter with a first reference voltage and outputs the shutdown signal. The first converter pre-charges the output voltage to a predetermined voltage level during a first period, maintains a level of the output voltage during a second period subsequent to the first period, and boosts and outputs the output voltage as the first voltage during a third period subsequent to the second period. The first short circuit protection part outputs the shutdown signal when the output voltage in the second period has a level lower than that of the first reference voltage.