Display Power Output Segmentation for Overcurrent Shutdown
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Solution Overview
Problem
Display devices face the challenge of protecting switching elements from damage due to overcurrent, which can occur when applying operating voltages to pixels, leading to potential damage and reduced device lifespan.
Innovation Solution
A display device and driving method that incorporate a power supply circuit connected to first and second output parts, sensing parts to monitor currents, and a defect determination part to compare sensing values with reference values, allowing for controlled shutdown of the power supply to prevent overcurrent and protect the switching elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single output part is used to apply operating voltage to pixels, then the device structure is simple, but the switching element is vulnerable to overcurrent damage
Solution Approach 1:
The voltage output function is segmented into multiple independent output parts (first output part and second output part). Each output part has its own sensing part that monitors current independently. This segmentation allows the system to distribute the loading and provides redundant protection paths, resolving the contradiction by improving reliability through distributed monitoring while maintaining manageable complexity through modular design.
Solution Approach 2:
The sensing parts are positioned to detect current conditions before overcurrent damage can occur. The defect determination part continuously compares sensing values with reference values in advance, enabling the system to take protective action (shutdown) before the switching element suffers damage. This preliminary detection and protection mechanism resolves the contradiction by preventing damage proactively rather than reactively.
2Reliability
If overcurrent protection is added to prevent switching element damage, then reliability improves, but device complexity increases due to additional sensing and control circuits
Solution Approach 1:
Each output part is equipped with its own sensing part that autonomously monitors its current condition. The sensing parts self-detect overcurrent conditions without requiring external intervention, and the defect determination part automatically compares sensing values with reference values and triggers shutdown when needed. This self-service approach improves reliability while minimizing complexity by eliminating the need for complex centralized monitoring systems.
Solution Approach 2:
The sensing parts provide continuous feedback on current conditions to the defect determination part. The defect determination part uses this feedback to compare actual current levels against reference values and automatically triggers protective shutdown when overcurrent is detected. This feedback mechanism resolves the contradiction by providing simple, direct control logic that improves reliability without requiring complex protection circuitry.
Data Source
AI summary
Disclosed is a display device including a first output part, a second output part, a power supply circuit connected to input terminals of the first output part and the second output part, a first sensing part connected to an output terminal of the first output part, a second sensing part connected to an output terminal of the second output part, a first voltage output terminal connected to the first sensing part and the second sensing part, a plurality of pixels connected to the first voltage output terminal and configured to display an image, and a defect determination part controlling shutdown of the power supply circuit by comparing a first sensing value and a second sensing value, which are received from the first sensing part and the second sensing part, with a first reference value and a second reference value having a level lower than the first reference value.