Display Defect Detection Using Dual Sense Wire Comparison
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display devices, particularly flexible displays, are vulnerable to cracks that can grow over time due to mechanical stress, leading to defects such as short circuits and increased resistance in signal lines, and can allow moisture to penetrate, causing deterioration of display elements.
Innovation Solution
A display device with a circuit including a comparator, a first sense wire, and a second sense wire disposed in the peripheral area, where the comparator compares output signals from both sense wires to determine if a defect, such as a crack, is present in the display device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single sense wire is used for defect detection, then the device complexity is reduced, but the measurement precision deteriorates due to inability to compensate for wire resistance differences
Solution Approach 1:
The detection system is segmented into multiple sense wires (first sense wire and second sense wire) with different configurations. Each sense wire independently measures resistance characteristics, allowing the system to segment the measurement function into multiple channels that can be compared to identify defects while compensating for manufacturing variations.
Solution Approach 2:
Different sense wires are designed with different local qualities - specifically different lengths and positions within the display panel. The first sense wire has a longer length while the second sense wire has a shorter length, creating intentional differences in their baseline resistance characteristics. This local quality differentiation enables the system to distinguish between normal resistance variations and actual defects.
2Measurement precision
If multiple sense wires with different lengths are used, then the measurement precision improves through comparison, but the device complexity increases
Solution Approach 1:
The detection system uses multiple sense wires that are essentially copies of the same basic wire structure, but with controlled variations in length and position. These copied structures allow the system to perform differential measurements - comparing identical types of wires under different conditions - which improves precision while keeping each individual wire simple and manageable.
3Area of stationary object
If sense wires are made longer to cover more area, then the detection coverage is improved, but the wire resistance increases making defect detection more difficult
Solution Approach 1:
The system transitions from a single-dimension approach (one wire length) to a multi-dimensional approach by varying both the length and position of sense wires across different areas of the display panel. This dimensional expansion allows long wires to provide broad coverage while short wires provide reference measurements, and the comparison across dimensions enables defect detection despite resistance variations.
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
The solution enhances the accuracy of defect detection in display devices, preventing erroneous detection and providing detailed information on the progression of cracks, while also compensating for wire resistance differences due to manufacturing process variations.
Implementation Method 1
the comparator compares a first output signal output from the first sense wire and a second output signal output from the second sense wire to generate a comparison result
Data Source
AI summary
A display device includes a display panel having a display area and a peripheral area. The display device includes a circuit having a comparator, and first and second sense wires disposed in the peripheral area and connected to the circuit. The comparator compares a first output signal output from the first sense wire and a second output signal output from the second sense wire to generate a comparison result. The circuit determines whether a defect is present in the display device based on the comparison result.