Display Device Misalignment Detection via Mobility Sensing
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Solution Overview
Problem
During the manufacturing process of display devices, misalignment between a display panel, a flexible printed circuit board, and a printed circuit board can lead to overcurrent issues, potentially burning the data driver and display panel.
Innovation Solution
A display device and driving method that utilize a timing controller to detect misalignment by analyzing mobility sensing information, generating error detection signals, and stopping scan signal output or turning off power to prevent damage, including features like frame memory, sensing analyzing, defective line analyzing, and monitoring portions to identify and address misalignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If misalignment detection is not implemented during manufacturing, then the manufacturing process is simple and fast, but the data driver and display panel may be burnt due to overcurrent
Solution Approach 1:
The timing controller performs preliminary alignment detection by analyzing mobility sensing information before the display device is fully assembled and before normal operation begins. This preliminary check identifies misalignment between the data driver and display panel, allowing corrective action to be taken before overcurrent conditions can cause burn failures.
Solution Approach 2:
The system implements feedback by continuously monitoring mobility sensing information during the manufacturing process. When misalignment is detected through abnormal mobility values, the system provides feedback signals to alert operators or trigger corrective actions, creating a closed-loop quality control mechanism that prevents burn failures.
2Measurement precision
If mobility sensing information is analyzed for every pixel, then misalignment detection precision is high, but the processing time and computational load increase
Solution Approach 1:
The display panel is divided into multiple blocks, and mobility sensing information is analyzed in a block-by-block manner rather than processing all pixels simultaneously. This segmentation allows the system to identify misalignment issues in specific regions without requiring complete processing of the entire display, reducing overall processing time while maintaining detection precision.
Solution Approach 2:
The system performs mobility sensing analysis on selected blocks or regions of the display panel rather than uniformly processing every pixel. When misalignment is detected in a particular block, the system can focus subsequent analysis on affected areas, performing partial processing that reduces computational load while maintaining sufficient detection precision for manufacturing quality control.
Data Source
AI summary
A display device includes: a display panel including a plurality of pixels; a first flexible printed circuit board attached to the display panel and electrically connected thereto; a first printed circuit board attached to the first flexible printed circuit board and electrically connected thereto; a data driver which applies a data voltage to the plurality of pixels, receives a voltage flowing to the plurality of pixels and generates mobility sensing information based on the voltage flowing to the plurality of pixels; and a timing controller which detects a first misalignment between the first printed circuit board and the first flexible printed circuit board, and a second misalignment between the display panel and the first flexible printed circuit board, based on the mobility sensing information.