Display Interface Pin Grounding for Inactive Cable EOS Blocking
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Solution Overview
Problem
Display devices are prone to electrical over stress (EOS) defects when connected to external devices, especially when in an inactive mode, leading to potential circuit damage due to unstable power environments or malfunctioning external devices.
Innovation Solution
A display device with an interface connected to multiple cables, an EOS grounding unit, and a controller that grounds at least one connection pin corresponding to inactive cables to prevent EOS, and ungrounds it when the cable becomes active, along with an EOS detector for user notification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a cable remains connected in inactive mode, then the cable is available for future use, but EOS may flow through the cable and cause defects in internal circuits
Solution Approach 1:
The patent implements dynamic control of connection pins by switching between grounded and ungrounded states based on cable activity status. The controller monitors cable usage and dynamically adjusts the grounding state of connection pins, making the protection mechanism adaptive rather than static. This resolves the contradiction by enabling pins to be ungrounded when cables are active (allowing normal operation) and grounded when cables are inactive (blocking EOS).
Solution Approach 2:
The patent introduces an intermediary grounding mechanism between the cable connection pin and the internal circuit. The EOS grounding unit acts as a mediator that can selectively connect or disconnect the pin from ground potential. This intermediary layer blocks EOS from reaching internal circuits while allowing the cable to remain physically connected and ready for use, thus resolving the contradiction between cable availability and circuit protection.
2Reliability
If connection pins are continuously grounded to prevent EOS, then EOS defects are prevented, but normal signal transmission through cables is blocked
Solution Approach 1:
The patent implements periodic switching of the grounding state based on cable activity detection. The controller periodically monitors whether a cable is actively transmitting signals and switches the grounding state accordingly - ungrounded during active periods for normal operation, and grounded during inactive periods for EOS protection. This periodic action resolves the contradiction by ensuring pins are grounded only when necessary.
Solution Approach 2:
The system dynamically adjusts the grounding state of connection pins based on real-time cable activity status. Rather than maintaining a fixed grounded state, the controller continuously monitors cable usage and switches the pin state between grounded and ungrounded as needed. This dynamic control ensures signal transmission is not blocked during normal operation while providing EOS protection when cables are inactive.
3Adaptability or versatility
If multiple cables are connected to provide versatile connectivity, then adaptability is improved, but the probability of EOS defects increases
Solution Approach 1:
The patent applies segmentation by providing separate EOS grounding control for each cable connection pin. Instead of a single collective grounding mechanism, each pin has its own independent grounding switch controlled by the controller. This allows selective grounding of individual pins based on their respective cable activity status, enabling the system to maintain multiple connected cables while protecting against EOS on each individual connection.
Solution Approach 2:
The system dynamically controls the grounding state of each connection pin independently based on the activity status of its corresponding cable. The controller monitors each cable separately and adjusts the grounding state of each pin accordingly. This dynamic per-pin control allows multiple cables to remain connected for versatility while ensuring that pins connected to inactive cables are grounded to block EOS, thus resolving the contradiction between connectivity and EOS protection.
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 blocks EOS in inactive modes, preventing defects and providing user notifications for overvoltage issues, ensuring the display device's reliability and usability.
Implementation Method 1
an electrical over stress (EOS) grounding unit configured to ground EOS flowing in through the cables
Data Source
AI summary
Disclosed herein are a display device capable of preventing electrical over stress (EOS) defects by detecting and grounding EOS flowing in through an interface when a cable of external device is connected and a method for preventing EOS defects thereof. When a cable in an inactive mode exists in a plurality of cables, an EOS grounding unit may be controlled so that at least one connection pin corresponding to the cable in the inactive mode is grounded and when the cable in the inactive mode is changed to an active mode, the EOS grounding unit may be controlled so that at least one connection pin is ungrounded.