Display Power Supply Circuit Delay Sub-Circuit False Protection
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Solution Overview
Problem
Power-off protection in display devices often causes subsequent detection failures due to premature activation from large pulse currents or voltage fluctuations during the powering process, leading to potential damage and inability to perform subsequent detection.
Innovation Solution
A power supply circuit comprising a control sub-circuit and a delay sub-circuit, where the control sub-circuit provides preset voltages and the delay sub-circuit delays the second preset voltage for a predetermined time before outputting it to the power supply terminals, ensuring stable powering and preventing power-off protection activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power-off protection is activated during powering process, then display device is protected from damage, but subsequent detection cannot be performed
Solution Approach 1:
The patent applies preliminary action by introducing a delay sub-circuit that delays the second preset voltage before it is supplied to the display screen. This preliminary delay action prevents large pulse currents from occurring when the second preset voltage is first applied, thereby avoiding false power-off protection activation while still allowing the protection function to operate normally for actual failures. The delay sub-circuit performs the protective action in advance by controlling the timing of voltage application.
2Speed
If second preset voltage is applied immediately, then powering process is fast, but large pulse current causes power-off protection activation
Solution Approach 1:
The delay sub-circuit performs preliminary action by delaying the application of the second preset voltage to the display screen. This preliminary delay prevents the instantaneous large pulse current that would otherwise cause false power-off protection activation. The circuit structure includes a delay control sub-circuit that generates a delay control signal to control the timing of voltage application, ensuring reliable operation.
Solution Approach 2:
The patent introduces an intermediary element - the delay sub-circuit - that mediates between the power supply and the display screen. This intermediary delays the voltage transmission and controls the timing, preventing direct application of the second preset voltage that would cause large pulse currents. The delay sub-circuit acts as a buffer that reconciles the need for fast powering with the need to avoid protection activation.
3Reliability
If delay sub-circuit is added, then power-off protection is avoided, but device complexity increases
Solution Approach 1:
The delay sub-circuit serves as an intermediary component that prevents false power-off protection activation. While it does increase device complexity, the patent integrates this sub-circuit into the existing power supply architecture in a minimally invasive way. The delay sub-circuit includes standard electronic components (delays, switches, voltage sources) that can be integrated into conventional display device power supply systems.
Data Source
AI summary
A display device, a power supply circuit and a power supply method are provided. The power supply circuit includes a control sub-circuit and a delay sub-circuit. The control sub-circuit is configured to provide a first preset voltage and a second preset voltage and output the first preset voltage to a first power supply terminal; and delay sub-circuit is configured to delay the second preset voltage and output the delayed second preset voltage to a second power supply terminal.