Display Pixel Mobility Sensing for Power-On Abnormality Detection
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Solution Overview
Problem
Display devices, such as liquid crystal and organic light emitting displays, can suffer from damage leading to short-circuits and potential fires, necessitating rapid detection of abnormalities post-power-on.
Innovation Solution
Incorporation of a sensing unit to measure pixel mobilities and temperature, with an abnormality detector to determine device abnormalities based on mobility and temperature differences, enabling quick power-off when issues are detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If mobility sensing is performed continuously to detect abnormalities, then detection speed is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic mobility sensing during specific frame periods (first through fourth sensing frame periods) rather than continuous sensing. The abnormality detector activates during these designated periods to sense pixel mobilities and compare them against reference values, thereby achieving abnormality detection while reducing overall power consumption by keeping the sensing unit inactive during non-sensing periods
2Measurement precision
If mobility sensing is performed during all frame periods, then detection accuracy is improved, but display quality deteriorates due to reduced display time
Solution Approach 1:
The patent divides the frame period into display periods and sensing periods. During the first through fourth sensing frame periods, mobility sensing is performed to detect abnormalities. During other frame periods, the display function operates normally. This periodic alternation ensures abnormality detection accuracy while maintaining display quality and duration.
3Reliability
If multiple sensing frame periods are used for abnormality detection, then detection reliability is improved, but device complexity increases
Solution Approach 1:
The patent segments the abnormality detection process into multiple sensing frame periods (first, second, third, and fourth sensing frame periods), each performing mobility sensing with different reference values. The abnormality detector compares mobilities from these segmented periods to determine abnormalities. This segmentation improves reliability by providing multiple detection opportunities while maintaining manageable complexity through systematic organization of sensing operations
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables rapid detection and prevention of potential damage by powering off the display device when abnormalities are identified, enhancing safety and reducing fire risks.
Implementation Method 1
a temperature sensor configured to measure a current temperature
Implementation Method 2
a sensing unit configured to sense mobilities of the pixels during a sensing frame period
Data Source
AI summary
A display device according to some embodiments of the present disclosure includes: pixels; a sensing unit configured to sense mobilities of the pixels during a sensing frame period; a temperature sensor configured to measure a current temperature; and an abnormality detector configured to determine whether the display device is abnormal based on the mobilities and powers off the display device based on an abnormality being detected, wherein the abnormality detector is configured to determine whether the display device is abnormal based on the current temperature and the mobilities during a first sensing frame period after a power-on sequence.