AMOLED Display Panel Startup Short Detection Circuit
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In AMOLED display panels, the sudden powering up of the first power transmission line can cause a false short-circuit determination by the start-up short detection circuit, leading to the DC-DC circuit switching off, especially due to the brightening of the first frame which pulls up the electric potential of the second power transmission line.
Innovation Solution
A display panel design that includes a control circuit to delay the start of the first supply voltage by a time interval equal to or greater than one image frame period after the second supply voltage is provided, and a start-up short detection circuit that detects voltages on both power transmission lines to accurately determine short-circuit faults, preventing false triggers and ensuring continuous operation of the DC-DC circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the first power transmission line is powered up suddenly, then the DC-DC circuit can start providing voltage quickly, but the start-up short detection circuit may make a false short-circuit determination causing the DC-DC circuit to switch off
Solution Approach 1:
The patent applies preliminary action by detecting the voltage of the second power transmission line before the DC-DC circuit starts providing voltage. This allows the system to identify potential short-circuit faults in advance, preventing false short-circuit determinations when the first power transmission line is suddenly powered up. The detection occurs during a time interval before voltage application, ensuring accurate fault identification without triggering false positives.
2Productivity
If the DC-DC circuit provides voltage quickly without delay, then the display can be activated faster, but false short-circuit errors occur leading to circuit shutdown
Solution Approach 1:
The patent implements preliminary action by performing voltage detection on the second power transmission line before the DC-DC circuit begins voltage provision. This preliminary detection phase occurs during a controlled time interval, allowing the system to prepare and identify faults before actual operation begins, thus preventing false errors and ensuring continuous circuit operation.
Solution Approach 2:
The patent uses the voltage detection mechanism as an intermediary between the power transmission lines and the DC-DC circuit operation. By detecting the voltage state of the second power transmission line during the time interval before voltage provision, the system mediates between quick activation requirements and reliable operation, preventing false short-circuit determinations from causing unnecessary shutdowns.
3Illumination intensity
If the brightening of the first frame pulls up the electric potential of the second power transmission line, then the display can initialize properly, but the start-up short detection circuit incorrectly identifies this as a short-circuit fault
Solution Approach 1:
The patent applies preliminary action by detecting the voltage of the second power transmission line during a time interval before the DC-DC circuit provides voltage and before the first frame brightens. This timing ensures that the detection occurs when the electric potential is stable and not influenced by frame initialization effects, allowing accurate distinction between normal voltage fluctuations and actual short-circuit faults.
Data Source
AI summary
A display panel includes: a display unit, including a pixel circuit; a first power transmission line and a second power transmission line; a DC-DC circuit, configured to provide a first supply voltage and a second supply voltage for the pixel circuit through the first power transmission line and the second power transmission line respectively; a control circuit, configured to control the DC-DC circuit to start to provide the second supply voltage after the DC-DC circuit starts to provide the first supply voltage, where a time interval between a start of providing the second supply voltage and a start of providing the first supply voltage is no less than a time period to display one image frame; and a start-up short detection circuit, configured to determine whether a short-circuit fault occurs between the first power transmission line and the second power transmission line.