Display Device Protection Circuit for Leakage Current Prevention
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Solution Overview
Problem
Display devices experience abnormal screen phenomena, such as blinking, due to residual voltage in power lines when the pixel unit is turned off, leading to external leakage currents.
Innovation Solution
A display device with a protection circuit that discharges voltage from power lines and sets them to a high impedance state after a predetermined time, preventing external leakage currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protection circuit is used to discharge voltage from power lines when pixels are turned off, then blinking phenomena are prevented, but external leakage currents may be supplied to the power lines
Solution Approach 1:
The protection circuit dynamically changes the impedance state of the power lines based on the operating condition. When pixels are turned off, the circuit transitions power lines from a low impedance state (during operation) to a high impedance state (after discharge), preventing leakage currents while maintaining effective voltage discharge for blinking prevention
Solution Approach 2:
The protection circuit performs voltage discharge from the power lines before completely turning off the pixel unit. By anticipating the need to prevent both blinking and leakage currents, the circuit discharges voltage in advance and then transitions to high impedance state, addressing both concerns proactively rather than reactively
2Stability of the object's composition
If power lines are discharged to prevent blinking, then screen stability is improved, but the power lines remain vulnerable to leakage currents
Solution Approach 1:
The protection circuit dynamically adjusts the electrical state of power lines through two phases: first discharging voltage to ensure screen stability and prevent blinking, then transitioning to a high impedance state to isolate the power lines and prevent leakage current damage. This dynamic state change resolves the contradiction between stability and safety
3Reliability
If the protection circuit operates continuously to maintain power line discharge, then blinking is prevented, but power consumption increases and leakage prevention is compromised
Solution Approach 1:
The protection circuit operates periodically rather than continuously. It activates to discharge voltage when pixels are turned off (preventing blinking), then transitions power lines to a high impedance state after a predetermined time period. This periodic operation reduces power consumption compared to continuous operation while maintaining blinking prevention effectiveness
Solution Approach 2:
The circuit performs the essential discharge function in advance when pixels are turned off, then stops operation by transitioning to high impedance state. This preliminary action approach ensures blinking prevention occurs when needed while avoiding continuous power consumption, as the circuit only operates during the transition period rather than continuously
Data Source
AI summary
A display device including: a pixel unit including pixels for generating light in response to a first power and a second power; a power supply for supplying the first power to a first power line and the second power to a second power line; and a protection circuit for discharging a voltage of the first power line and the second power line when the pixels are in a turn-off state, and putting the first power line and the second power line in a high impedance state after a predetermined time.