Display Panel Bad-Pixel Detection Through Sensing-Data Feedback
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Solution Overview
Problem
Display devices face the challenge of panel defects, such as short circuits, which can cause high currents to flow through pixels, leading to burnt or fired panels.
Innovation Solution
A display device that includes a display panel with pixels, a data driver receiving sensing data related to the driving current of each pixel, and a driving controller that calculates the change in sensing data to identify bad pixels and perform a panel protection operation, such as powering off the device, when a certain threshold of bad pixels is detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a panel defect (short circuit) occurs in the display device, then high current flows through the pixels causing burnt or fire, but the display device cannot detect and prevent this damage in time
Solution Approach 1:
The patent performs preliminary actions by continuously monitoring sensing data from multiple mobility sensing operations before a panel defect causes damage. The driving controller calculates change amounts of sensing data and determines bad pixels in advance, enabling the system to detect defects before they lead to high current flow and panel damage.
Solution Approach 2:
The patent implements feedback by using sensing data from pixels to monitor the health of the panel. The driving controller receives sensing data, calculates change amounts, determines bad pixels, and based on this feedback performs panel protection operations. This closed-loop feedback mechanism enables real-time detection and response to panel defects.
2Reliability
If the display device continuously monitors all pixels for defects, then panel safety is improved, but the complexity of the monitoring system increases
Solution Approach 1:
The patent segments the monitoring process by dividing pixels into different groups (first pixel columns and other pixel columns) based on their sensing data characteristics. This segmentation allows the system to apply different monitoring strategies to different pixel groups, reducing overall system complexity while maintaining comprehensive safety monitoring.
Solution Approach 2:
The patent applies local quality by determining different handling strategies for different pixel columns based on their sensing data. First pixel columns with specific characteristics are identified and excluded from certain monitoring operations, while other pixel columns continue to be monitored. This localized differentiation optimizes the monitoring system complexity.
3Measurement precision
If the display device performs multiple mobility sensing operations after power on, then the accuracy of bad pixel detection is improved, but the time required for initialization increases
Solution Approach 1:
The patent performs mobility sensing operations as preliminary actions during the initialization phase after power on. By completing multiple sensing operations and determining first pixel columns during this initial period, the system prepares comprehensive monitoring data in advance, improving detection accuracy while managing initialization time through structured preliminary processing.
Data Source
AI summary
A display device includes a display panel including pixels, a data driver receiving sensing data corresponding to a driving current value of a driving transistor of each of the pixels, and a driving controller calculating a change amount of the sensing data, determining bad pixels based on the change amount of the sensing data, and performing a panel protection operation based on a number of the bad pixels.