Display Panel Defect Detection via Dummy Pixel Line Current Sensing
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Solution Overview
Problem
Display panels can suffer defects leading to potential short circuits and damage, necessitating pixel repair technologies to address these issues.
Innovation Solution
A method involving applying voltage to pixels through data lines, measuring current through dummy pixel lines using a sensing driver, and comparing with a reference value to detect defects, utilizing a sensing driver integrated with a data driver to identify current changes indicative of panel defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If pixel repair technology is used to repair defective pixels, then the display panel can be repaired instead of replaced, but additional damage may occur such as fire due to short circuits
Solution Approach 1:
The patent applies preliminary action by performing defect detection before the pixel repair process. A sensing driver applies voltage to dummy pixels through dummy pixel lines and measures current to identify defective pixels in advance. This allows the repair process to target only confirmed defective pixels, preventing unnecessary repairs that could cause additional damage or fire hazards.
Solution Approach 2:
The patent implements feedback by using the current measurement from dummy pixel lines to determine pixel health status. The sensing driver compares the measured current against reference values to identify defective pixels, providing feedback information that guides the repair process and prevents attempting repairs on already repaired or functional pixels, thereby reducing the risk of additional damage.
2Measurement precision
If additional sensing components are added to detect defects, then defect detection capability is improved, but device complexity increases
Solution Approach 1:
The patent applies merging by integrating the sensing driver functionality into the existing data driver circuitry. The sensing driver shares the same hardware resources (data lines, dummy pixel lines, voltage generation components) as the normal display operation circuitry. This allows defect detection capability to be improved without adding separate sensing components, as the same components serve dual purposes: normal data transmission and defect detection through current measurement.
Solution Approach 2:
The patent implements universality by designing the data driver and dummy pixel lines to serve multiple functions. The data lines used for normal display operation also serve as sensing paths for defect detection. The dummy pixel lines used for compensation also serve as current measurement paths. This multi-functionality allows defect detection without requiring dedicated separate sensing hardware, thereby avoiding increased device complexity.
3Measurement precision
If voltage is applied to pixels for defect detection, then current measurement can identify defects, but the measurement process takes additional time
Solution Approach 1:
The patent applies periodic action by incorporating defect detection into the existing scanout sequence of the display panel. The sensing driver measures current through dummy pixel lines during the normal scanout period when data lines are being read. This allows defect detection to be performed periodically alongside normal display operation rather than requiring separate dedicated measurement time, thereby minimizing the loss of time while maintaining measurement precision.
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
Effectively detects display panel defects, enabling timely repair and preventing further damage without additional wires or terminals, ensuring reliable operation.
Implementation Method 1
measuring a current flowing through a dummy pixel line
Implementation Method 2
the current flowing through the dummy pixel line is converted into a sensing voltage by the current detector
Implementation Method 3
the sensing voltage and a reference voltage may be input to a comparator included in the current detector
Data Source
AI summary
In a method of detecting a display panel defects, the method includes: applying a voltage to one or more pixels; and measuring a current flowing through a dummy pixel line.