Vehicle Display Emission Control for Abnormal Power-Off Errors
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Solution Overview
Problem
Display devices in vehicles can malfunction due to shocks or overcurrent, leading to display errors such as flickering or horizontal stripes, which may cause accidents due to the driver's sudden reaction.
Innovation Solution
A display device and vehicle system that includes a gate driving circuit, converter, logic gate, and timing controller to detect changes in interface data signals and power supply voltage, blocking emission control transistors to prevent abnormal turn-off and eliminate display errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the display panel is abnormally turned off due to shock or overcurrent, then the display device stops operating, but display errors such as flickering or horizontal stripes occur during the abnormal turn-off process which may cause accidents
Solution Approach 1:
The patent applies preliminary anti-action by detecting abnormal power-off conditions through monitoring interface data signals and power supply voltage changes, then proactively blocking the emission control transistor before display errors can occur. This preventive mechanism counteracts the harmful effect of abnormal turn-off by eliminating the root cause rather than merely responding to symptoms.
Solution Approach 2:
The timing controller performs preliminary action by checking power status and controlling the emission start signal before the display panel actually turns off. By detecting power supply voltage changes and interface data signal transitions in advance, the system prepares the emission control transistor for blocking, ensuring no display errors occur during the transition period.
2Reliability
If the emission control transistor is blocked to prevent display errors, then display stability is improved, but additional control circuits and signal processing are required
Solution Approach 1:
The timing controller is designed with multi-functionality, serving both as the primary control unit for normal display operation and as the abnormal condition detector for power-off events. By integrating the power check function and emission control into the existing timing controller, the patent avoids adding separate dedicated circuits, thereby reducing overall system complexity while maintaining reliability.
Solution Approach 2:
The system implements feedback by continuously monitoring the interface data signal and power supply voltage, then using this information to control the emission start signal. The logic gate processes the feedback from power status detection and automatically adjusts the emission control transistor state, creating a closed-loop system that improves reliability without requiring complex open-loop control circuits.
3Reliability
If the timing controller monitors power supply voltage and interface data signals to detect abnormal turn-off, then display error prevention is improved, but power consumption increases due to continuous monitoring
Solution Approach 1:
The monitoring of power supply voltage and interface data signals is implemented through periodic sampling rather than continuous monitoring. The timing controller checks power status at specific intervals and at transition events, reducing the energy consumption associated with constant monitoring while maintaining sufficient detection capability for abnormal turn-off conditions.
Solution Approach 2:
The system uses self-service by leveraging existing signal lines (interface data signal and power supply voltage lines) that are already present in the display system for their primary functions. These existing signals are simultaneously used for abnormal condition detection, eliminating the need for separate dedicated monitoring circuits and reducing the additional power consumption that would result from independent monitoring subsystems.
Data Source
AI summary
The present disclosure provides a display device and vehicle system including the display device. The display device includes a display panel that includes a plurality of subpixels, a gate driving circuit configured to supply a scan signal and an emission signal to the display panel through a plurality of gate lines, a converter configured to convert a first level circuit power supplied from a host system into a second level circuit power, a logic gate configured to generate a power check signal based on an interface data signal transmitted through an interface line and the second level circuit power, and a timing controller configured to control an emission start signal supplied to the gate driving circuit depending on the power check signal.