Display Device Short Circuit Detection via Conducting Layer
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Solution Overview
Problem
Display devices with intersecting power source lines are prone to short circuits due to foreign objects or manufacturing defects, leading to heat generation and display defects, which existing insulation layers fail to prevent effectively.
Innovation Solution
A display device with a conducting layer interposed between intersecting power source lines via insulation layers, equipped with a current detection mechanism to identify abnormal currents and a switch to terminate operation when a short circuit is detected, ensuring the power source lines are disconnected to prevent further damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If power source lines are arranged to intersect in the pixel region, then wiring efficiency is improved, but short circuit risk increases due to foreign objects or manufacturing defects
Solution Approach 1:
A conducting layer is introduced as an intermediary component between the first and second power source lines at their intersection point. This conducting layer is electrically connected to both power source lines and serves as a mediator to detect short circuits. When a short circuit occurs, the conducting layer enables current flow between the power source lines, which is then detected by a current detection portion, allowing for timely identification and prevention of display defects.
Solution Approach 2:
The patent implements a feedback mechanism where a current detection portion continuously monitors the current flowing through the conducting layer at the intersection of power source lines. When the detected current exceeds a predetermined threshold, indicating a short circuit condition, a switch portion automatically responds by disconnecting the power supply. This closed-loop feedback system enables real-time detection and automatic protection against short circuit damage.
2Reliability
If insulation layers are used to prevent short circuits between intersecting power source lines, then short circuit prevention is improved, but detection capability deteriorates because insulation prevents current flow detection
Solution Approach 1:
The conducting layer serves as a strategic intermediary that is intentionally placed at the intersection of insulated power source lines. While insulation layers prevent direct contact between power source lines, the conducting layer provides a controlled electrical connection point. This intermediary structure allows the system to maintain insulation for normal operation while enabling current detection when short circuits occur, as the conducting layer becomes the pathway for abnormal current flow.
Solution Approach 2:
The conducting layer is pre-positioned at the intersection point of power source lines before any short circuit occurs. This preliminary arrangement ensures that when a short circuit happens due to foreign objects or manufacturing defects, the conducting layer is already in place to facilitate current flow between the power source lines. The current detection portion can then immediately detect this abnormal current flow without delay.
3Device complexity
If no current detection mechanism is implemented, then device complexity is reduced, but ability to prevent heat generation and display defects deteriorates
Solution Approach 1:
The patent incorporates a feedback-based protection system consisting of a current detection portion and a switch portion. The current detection portion continuously monitors current flow through the conducting layer, and when abnormal current indicating a short circuit is detected, the switch portion automatically disconnects the power supply. This feedback mechanism enables the system to detect and respond to short circuit conditions, preventing heat generation and display defects while maintaining relatively simple implementation.
Solution Approach 2:
The conducting layer serves a dual function: it acts as an electrical connector between power source lines during normal operation and simultaneously serves as a detection pathway for short circuit currents. This self-service approach allows the same structural element to contribute to both circuit functionality and fault detection, reducing the need for separate complex detection systems.
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 short circuits between power source lines and terminates the display device's operation to prevent heat generation and defects, enhancing reliability and preventing display defects caused by short circuits.
Implementation Method 1
a current detection portion electrically connected with the conducting layer
Data Source
AI summary
A display device in an embodiment according to the present invention includes a pixel region includes a plurality of pixels arranged in a matrix, a first power source line arranged in the pixel region and provided with a first power source voltage supplying a current to the plurality of pixels, a second power source line located in a layer higher than the first power source line in the pixel region and including an intersection part intersecting the first power source line and provided with a second power source voltage different to the first power source voltage, a conducting layer interposed between the first power source line and the second power source line via an insulation layer and having at least one part overlapping the intersection part, a current detection portion electrically connected with the conducting layer.