Inspection Pad Resistor for Static Electricity Protection in OLED Displays
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Solution Overview
Problem
Display devices, particularly OLEDs, are vulnerable to damage from external static electricity, which can be introduced through inspection pads and cause damage to the organic light emitting diodes.
Innovation Solution
Incorporating resistors with a resistance of about 1 kΩ to 4 kΩ, made of polysilicon, at the outermost edges of inspection pads in the non-display area to block external static electricity from reaching the display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If inspection pads are provided in the non-display area for signal transmission, then ease of operation is improved, but static electricity can be introduced from the outside causing damage to the display device
Solution Approach 1:
A resistor is introduced as an intermediary component between the inspection pad and the display area. This resistor serves as a mediator that allows normal signal transmission while blocking harmful static electricity from reaching the display elements, thus resolving the contradiction between maintaining operational capability and preventing external harmful factors
Solution Approach 2:
The resistor is positioned in advance at the inspection pad to provide protective cushioning against static electricity before it can reach and damage the display area. This preventive measure is built into the structure beforehand, allowing the inspection pad to function normally while being protected from potential static electricity damage
2Reliability
If a resistor is added to block static electricity, then reliability is improved, but device complexity increases
Solution Approach 1:
The resistor is merged with the existing inspection pad structure, combining the protective function with the signal transmission function in a single integrated component. This merging approach improves reliability by adding protection while minimizing the increase in device complexity by reusing the existing pad infrastructure
Solution Approach 2:
The inspection pad is given multiple functions: it serves both as a signal transmission path and as a protective element through the integrated resistor that blocks static electricity. This multi-functionality approach allows the same structure to provide both operational capability and protection, improving reliability without proportionally increasing complexity
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 prevents damage to the display device by blocking external static electricity without causing signal delays, as the resistors are positioned outside the signal transmission path and are designed to absorb static electricity before it reaches the display area.
Implementation Method 1
a plurality of resistors, each located at an outermost edge of a respective inspection pad of the plurality of inspection pads
Data Source
AI summary
A display device according to an exemplary embodiment of the present invention includes: a substrate including a display area and a non-display area; a plurality of inspection pads in the non-display area; and a plurality of resistors, each located at an outermost edge of a respective inspection pad of the plurality of inspection pads, each of the resistors being located at a distance from the display area, the inspection pad located between the resistor and the display area, and the resistor located at the outermost edge of the non-display area.