Pixel Driving Circuit With Voltage-Based OLED Short-Circuit Protection
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Solution Overview
Problem
OLED displays can be short circuited during production, leading to panel damage and loss due to undetected short circuits, which existing detection methods cannot address.
Innovation Solution
A pixel driving circuit with a voltage detection module and short circuit processing module that turns off or on the light emitting diode based on detection voltage comparison with a reference voltage, using transistors and capacitors to prevent excessive current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If OLED detection is performed by sampling only, then detection simplicity is maintained, but short circuit processing capability is lost and panel damage cannot be avoided
Solution Approach 1:
The patent combines the voltage detection function and short circuit processing function into the existing pixel driving circuit by integrating a detection transistor and processing transistor with the standard switching and driving transistors. This merging approach enables short circuit detection and prevention without adding completely separate detection systems, thus improving reliability while controlling complexity.
Solution Approach 2:
The pixel driving circuit performs self-detection of short circuits through the detection transistor that monitors the voltage at the anode of the OLED. The circuit also performs self-protection by automatically controlling the processing transistor to cut off current when a short circuit is detected, eliminating the need for external detection and protection systems.
2Reliability
If no short circuit processing module is added, then device complexity remains low, but panel loss due to short circuit cannot be avoided
Solution Approach 1:
The detection transistor is configured to continuously monitor the voltage at the OLED anode during the driving process. By performing preliminary detection before excessive current can cause damage, the system can proactively activate the processing transistor to prevent short circuit damage, rather than reacting after damage occurs.
Solution Approach 2:
The detection transistor provides feedback information about the OLED voltage state to the control logic. When the detected voltage indicates a short circuit condition (abnormally high voltage), the feedback triggers the processing transistor to cut off the current, creating a closed-loop protection mechanism that automatically responds to short circuit conditions.
Data Source
AI summary
The present disclosure discloses a pixel driving circuit and a control method thereof. The pixel driving circuit includes: a signal driving module for driving a light emitting diode to emit light based on connected scanning signal lines and data signal lines; a voltage detection module connected to the signal driving module for collecting a detection voltage of the light emitting diode and comparing the detection voltage with a reference voltage to generate a control signal; and a short circuit processing module connected to the signal driving module and the voltage detection module for controlling the light emitting diode based on the control signal.