Display Panel Crack Sensing Circuit With Static Discharge Protection
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Solution Overview
Problem
Display panels, such as LCDs and OLEDs, are prone to cracks during manufacturing, which can lead to signal line disconnection or increased resistance, reducing the reliability and causing malfunctions due to moisture penetration.
Innovation Solution
Incorporating a crack sensing circuit with a static electricity discharge element connected to the data lines and input pads, which includes capacitors and switching elements to protect against static electricity and optimize defect detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a crack sensing circuit is added to detect defects, then defect detection capability is improved, but the circuit becomes vulnerable to static electricity damage
Solution Approach 1:
A static electricity discharge element is introduced as an intermediary component between the crack sensing circuit and the external environment. This element acts as a mediator that safely dissipates static charge accumulation, protecting the sensing circuit from direct static electricity damage while allowing the circuit to continue its defect detection function.
Solution Approach 2:
The static electricity discharge element is pre-configured in the circuit to provide preliminary protection against static electricity. By having the discharge element in place before any static charge accumulation occurs, the circuit is already protected, and the element automatically activates to discharge any accumulated static charge, preventing harmful effects.
2Device complexity
If the display panel structure is simplified, then manufacturing complexity is reduced, but defect detection capability is compromised
Solution Approach 1:
The crack sensing line serves multiple functions: it acts as both a structural component of the display panel and a sensing element for defect detection. By making the sensing line universal, the system achieves defect detection capability without adding separate dedicated sensing structures, thus avoiding increased complexity.
Solution Approach 2:
The crack sensing function is merged with the existing data line structure. The sensing circuit utilizes the same physical infrastructure (conductive lines, pixels) for both signal transmission and defect detection, combining multiple functions into a single integrated system rather than adding separate detection infrastructure.
3Reliability
If static electricity discharge elements are added to protect the circuit, then reliability is improved, but device complexity increases
Solution Approach 1:
The static electricity discharge element is designed to automatically detect and discharge static charge without requiring external control or intervention. The element self-activates when static charge accumulates to a harmful level, providing self-service protection that eliminates the need for complex control circuits or additional monitoring mechanisms.
Solution Approach 2:
The static electricity discharge element is implemented as a simple, inexpensive component that can be easily integrated into the circuit. Rather than using complex, expensive protection systems, the patent employs a straightforward discharge element that provides adequate protection with minimal complexity and cost.
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 effectively prevents damage from static electricity and enhances the accuracy of defect detection in display panels, reducing erroneous defect detection and ensuring reliable operation.
Implementation Method 1
a static electricity discharge element connected to the second end
Implementation Method 2
The static electricity discharge element may comprise a capacitor comprising a third end connected to the first test data line, and a fourth end connected to the second test data line as two terminals
Data Source
AI summary
A display device is provided. The display device may include a substrate, a plurality of pixels, a first data line, a second data line, a defect sensing line, a first input pad, and a static electricity discharge element. The substrate may include a display area and a peripheral area neighboring each other. The plurality of pixels may be positioned on the display area and may include a first pixel and a second pixel. The first data line may be electrically connected to the first pixel. The second data line may be electrically connected to the second pixel and may be electrically isolated from the first data line. The defect sensing line may be positioned on the peripheral area. The first input pad may be electrically connected to the defect sensing line. The static electricity discharge element may be electrically connected through the defect sensing line to the first input pad.