Display Driver Off-Sequence Control for Power-Failure Transients
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Solution Overview
Problem
Existing display devices face issues with screen transients due to improper power ON/OFF sequencing during AC power failures, leading to potential display malfunctions.
Innovation Solution
A display device with a processor that detects power supply voltage drops and controls signals to drivers in a specific sequence to prevent screen transients by transitioning them to a low state before power shutdown, using detection circuits and logic gates to identify off sequence information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power supply voltage detection and sequential signal control are implemented, then display stability during power failures is improved, but device complexity increases due to additional detection circuits and control logic
Solution Approach 1:
The detection circuit proactively monitors power supply voltage before complete failure occurs. When voltage drops below a threshold, the system preemptively controls drivers to transition to low state, preventing screen transients before they can manifest. This preliminary detection and response mechanism ensures display stability without requiring complex real-time intervention circuits.
2Reliability
If sequential signal control is implemented to prevent screen transients, then display quality is improved, but response time increases due to sequential rather than simultaneous signal transitions
Solution Approach 1:
The signal control is segmented into distinct sequences: first controlling reset signals to low state, then controlling power signals to low state. This segmentation allows each signal type to transition in an optimized order, preventing screen transients while maintaining efficient overall response time. The segmented approach is more effective than attempting simultaneous control of all signals.
Data Source
AI summary
A display device is disclosed. The display device includes: a display panel including a plurality of light emitting elements; at least one driver for driving the plurality of light emitting elements; a power supply device; and at least one processor configured to identify off sequence information of the at least one driver in case of detecting power supplied to the power supply device as being off based on an output voltage of the power supply device, and sequentially control a plurality of signals transmitted to the at least one driver to be in a low state based on the identified off sequence information before a voltage for driving the display panel is shut down.