Display Driving Chip Fallback Mode for Accident Alarm Images
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Solution Overview
Problem
In-vehicle display systems face challenges when accidents occur, as the display module may be damaged, and most functions of the display driving IC no longer work properly, necessitating a simple, low-power display method to generate an alarm image.
Innovation Solution
A display driving method that switches to a common voltage regulation display mode upon detecting an abnormal signal, controlling display grayscale using common voltage and adjusting bias voltages of common electrodes to display an alarm image, reducing complexity and memory unit requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the display module uses a normal driving mode with source driving circuit control, then the display can show complex images with high resolution, but the system complexity and power consumption increase when abnormal conditions occur
Solution Approach 1:
The patent extracts the display control function from the complex source driving circuit and isolates it to the common voltage regulation module. When abnormal conditions are detected, only the common voltage regulation module remains active to control grayscale, while other complex driving functions are deactivated. This extraction reduces the active system complexity during emergencies while maintaining essential display functionality for alarm images.
Solution Approach 2:
Instead of using the source driving circuit to control grayscale as in normal operation, the patent inverts the control approach by using the common voltage regulation module to control grayscale during abnormal conditions. This inversion simplifies the control path from a complex multi-circuit interaction to a single-module control mechanism, reducing system complexity while maintaining display capability.
2Reliability
If the display module uses normal driving mode with full memory units, then the display can store and process complex display data, but the memory requirements and power consumption increase during emergency alarm display
Solution Approach 1:
The patent extracts only the essential grayscale control function from the full memory system and places it in the common voltage regulation module. During abnormal conditions, only the minimum necessary memory elements in the common voltage regulation module are activated to store grayscale data for alarm images, rather than utilizing the complete memory array required for normal high-resolution display. This extraction reduces memory unit requirements while maintaining emergency display reliability.
3Reliability
If the display module operates in normal mode with source driving circuit control, then the display can provide detailed image information, but the power consumption is higher when only simple alarm images are needed
Solution Approach 1:
The patent extracts the essential grayscale control function from the power-intensive source driving circuit and relocates it to the common voltage regulation module. During abnormal conditions, only the common voltage regulation module consumes power to control the display grayscale, while the power-hungry source driving circuit remains inactive. This extraction dramatically reduces power consumption while maintaining the ability to display alarm images, addressing the energy efficiency requirement during emergencies.
4Device complexity
If the display module uses common voltage regulation mode during abnormal conditions, then the power consumption and control complexity are reduced, but the display grayscale control capability is simplified
Solution Approach 1:
The patent applies local quality by making the common voltage regulation module's grayscale control capability specifically optimized for alarm image display requirements. Rather than providing full-range grayscale control for all types of images, the module is designed with localized grayscale levels appropriate for high-visibility alarm scenarios. This localized optimization maintains sufficient adaptability for emergency communication while reducing overall system complexity.
Data Source
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AI summary
The present disclosure relates to a display driving method, a display driving chip, and a display device. The display driving method includes: determining whether an abnormal signal is detected in feedback; if so, switching to a common voltage regulation display mode until the abnormal signal disappears, wherein, in the common voltage regulation display mode, the display grayscale of the pixel circuit is controlled by the common voltage, so that an alarm image is displayed. Compared to display methods controlled by the source driving circuit, the approach according to the present disclosure can significantly reduce the complexity of control processes and the number of required memory units.