Display Device Pixel Mobility Sensing for Abnormal State Detection
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Solution Overview
Problem
Existing display devices face challenges in quickly sensing abnormal states, such as internal line shorts, which can lead to overcurrent and damage, making it difficult to prevent damage in a timely manner.
Innovation Solution
A display device with a first sensor that generates an initial sensing value during a power-on period and a second sensor that generates a first sensing value after display start, using a processing time difference to detect abnormalities, along with a scan driver and data driver that supply signals during blank periods to facilitate sensing, and a selection circuit that determines abnormal pixel candidates based on threshold values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a crack occurs in the display panel, then internal line shorting and overcurrent damage may occur, but the abnormal state is difficult to sense quickly enough to prevent damage
Solution Approach 1:
The patent applies preliminary action by performing mobility sensing during the power-on period before the display starts operating. The first sensor generates an initial sensing value in this pre-display period, establishing a baseline state before any potential damage can occur. This allows the system to detect abnormalities early, before they lead to overcurrent and damage.
Solution Approach 2:
The patent implements continuity of useful action by maintaining ongoing mobility sensing throughout the display operation. The first sensor continues to generate sensing values during the display period, and the second sensor compares these against the initial baseline. This continuous monitoring ensures that any changes in pixel mobility are detected immediately, providing uninterrupted detection capability.
2Speed
If mobility sensing is performed continuously to detect abnormalities, then detection speed improves, but processing time and computational load increase
Solution Approach 1:
The patent applies segmentation by dividing the sensing process into two distinct phases: an initial sensing phase during the power-on period when the first sensor generates baseline values, and a comparison phase during the display period when the second sensor compares current values against the baseline. This segmentation allows efficient detection without requiring continuous complex processing throughout all operating phases.
Solution Approach 2:
The patent implements partial action by performing mobility sensing selectively during specific periods (power-on and display periods) rather than continuously throughout all possible operations. The system senses mobility during the power-on period to establish a baseline, then compares subsequent readings during the display period, achieving adequate detection coverage with reduced processing time.
3Measurement precision
If multiple sensing processes are performed to ensure accurate abnormal state detection, then detection accuracy improves, but the complexity of the sensing system increases
Solution Approach 1:
The patent applies the intermediary principle by introducing a comparison mechanism that uses the initial sensing value as a reference baseline. The second sensor compares current mobility measurements against this pre-established baseline to identify abnormalities. This intermediary comparison approach simplifies the system architecture while maintaining high detection accuracy, as it relies on relative changes rather than absolute measurement complexity.
Data Source
AI summary
A display device of the disclosure includes a display panel including pixels, a first sensor configured to sense mobility of the pixels, and a second sensor. The first sensor generates an initial sensing value using a first process to sense the mobility during a first time period from a power-on time point of the display device to a display start time point, and generates a first sensing value using a second process to sense the mobility after the display start time point. The second sensor senses whether the display panel is an abnormal state based on the initial sensing value and the first sensing value.