Current Blocking Units in Display Device Wiring
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Solution Overview
Problem
During the manufacturing of organic electroluminescence (EL) display devices, the removal of short-circuit wiring can lead to electrostatic damage due to carbonized regions on the substrate, causing terminals to short-circuit and resulting in operational malfunctions.
Innovation Solution
Incorporating current blocking units, comprising rectifier elements, between the terminals and the substrate ends to prevent current flow and block short-circuiting, ensuring that even if carbonized regions form, they do not cause terminal pairs to short-circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If short-circuit wiring is removed from the display device, then the display device can be shipped as a final product, but electrostatic damage occurs causing terminals to short-circuit
Solution Approach 1:
The patent applies preliminary action by forming current blocking units (rectifier elements) in advance within the wiring structure before the short-circuit wiring removal step. These rectifier elements are pre-positioned to detect and block any electrostatic discharge currents that may occur after wiring removal, preventing terminal damage before it happens.
Solution Approach 2:
The patent introduces current blocking units (rectifier elements) as intermediary components within the wiring path. These intermediaries selectively block harmful electrostatic currents while allowing normal operating currents to pass through, mediating between the need for wiring removal and the need to protect terminals.
2Reliability
If current blocking units are added to prevent electrostatic damage, then terminal reliability improves, but device complexity increases
Solution Approach 1:
The patent merges the current blocking function with the existing wiring structure by forming rectifier elements directly within the wiring path using the same manufacturing processes. This integration combines the protective function with the conductive function, reducing overall device complexity despite adding protective capability.
Solution Approach 2:
The rectifier elements serve multiple functions: they block electrostatic discharge currents to protect terminals while simultaneously serving as part of the normal wiring structure for signal transmission. This multi-functionality reduces the need for separate protective components, minimizing complexity increase.
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 current blocking units effectively prevent short-circuiting between terminal pairs, thereby reducing the occurrence of operational malfunctions and ensuring the display device functions correctly.
Implementation Method 1
a first current blocking unit blocking a current flowing a direction from the second end part to the first end part of the first wiring, and a second current blocking unit blocking a current flowing a direction from the fourth end part to the third end part of the second wiring
Data Source
AI summary
A display device includes a substrate; a plurality of pixels on the substrate; a drive circuit on the substrate; a first terminal and a second terminal connected to the pixels or the drive circuit and arranged on the substrate; a first wiring having a first end part connected with the first terminal, and a second end part located on an end part of the substrate; a second wiring having a third end part connected with the second terminal, and a fourth end part located on an end part of the substrate; a first current blocking unit blocking a current flowing in a direction from the second end part to the first end part of the first wiring; and a second current blocking unit blocking a current flowing in a direction from the fourth end part to the third end part of the second wiring.