Source Driver Abnormality Detection for Display Reliability
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Solution Overview
Problem
In display devices, communication errors between the timing controller and source driver can lead to undetected signal abnormalities, causing display distortions and making it difficult for users to notice issues such as battery or electrical system failures, potentially misleading drivers in in-vehicle electronic mirrors.
Innovation Solution
The display device incorporates a data processing unit in each source driver to detect communication abnormalities and share an abnormal state signal, allowing it to switch to a self-running mode where it supplies a distinct gradation voltage signal to pixel units, visually indicating an abnormality on the display panel, such as an abnormality notification screen in black and white or RGB colors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the source driver outputs detection results to an external device for error handling, then communication errors can be processed, but additional communication may cause further communication errors and system complexity increases
Solution Approach 1:
The source driver performs self-diagnosis and self-correction by detecting communication errors internally and automatically switching to self-running mode using stored gradient voltage signals, eliminating the need for complex external communication protocols for error handling
Solution Approach 2:
A dedicated error detection circuit acts as an intermediary component within the source driver to monitor communication status and trigger the abnormal state signal, separating the detection function from the main control logic
2Reliability
If the source driver stops the gate driver control signal to prevent display distortion, then display distortion is prevented, but the display screen becomes fixed and users cannot notice the abnormality
Solution Approach 1:
The display panel displays a specific color pattern (e.g., red, green, blue stripes or specific color combinations) when an abnormal state is detected, allowing users to visually notice the abnormality while maintaining display functionality
Solution Approach 2:
The display output dynamically changes based on the abnormal state signal - normally displaying video content, but switching to a specific abnormality indication pattern when communication errors are detected, making the state change visible to users
3Area of stationary object
If multiple source drivers are used to cover the display panel, then the display area is expanded, but communication abnormalities may occur and cause display distortions
Solution Approach 1:
Each source driver includes an error detection circuit that continuously monitors communication status and provides feedback through an abnormal state signal, enabling real-time detection and correction of communication abnormalities across multiple drivers
Solution Approach 2:
The display system is divided into multiple independent source drivers, each with its own error detection and correction capabilities, allowing localized error handling without affecting the entire display system
Data Source
AI summary
A display device includes a display panel, a display controller configured to output a video data signal, a gate driver, and a plurality of source drivers which are arranged in an extension direction of gate lines and generate a gradation voltage signal to be supplied to each of a plurality of pixel units based on the video data signal supplied from the display controller. Each of the plurality of source drivers includes a data processing unit configured to share an abnormal state sharing signal indicating whether an abnormality has occurred in communication with the display controller with other source drivers, and when the abnormal state sharing signal indicates that an abnormality has occurred in communication with the display controller, supply a gradation voltage signal corresponding to predetermined gradation data different from a gradation voltage signal based on the video data signal to each of the plurality of pixel units.