OLED Protection Circuit Prevents Pixel Damage from Voltage Overlap
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Solution Overview
Problem
Existing organic light emitting display (OLED) devices face damage when data voltage and on-bias voltage are simultaneously provided, leading to potential pixel damage due to overlapping signals.
Innovation Solution
A protection circuit is introduced to prevent simultaneous turning on of switching transistors by converting control signals into protection signals, ensuring the data signal and on-bias voltage are not provided simultaneously to the pixels, thereby preventing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data voltage and on-bias voltage are simultaneously provided to pixels through data lines, then the display device can be driven with simultaneous emission with active voltage method, but pixel damage may occur due to overlapping signals
Solution Approach 1:
The protection circuit performs preliminary action by converting control signals before they reach the switching transistors. The circuit proactively transforms the control signals into protection signals that prevent simultaneous turning on of the first and second switching transistors, thereby preventing pixel damage before it can occur while maintaining the SEAV driving method
Solution Approach 2:
The protection circuit acts as an intermediary between the control signal source and the switching transistors. It receives control signals, converts them into protection signals, and provides these to the switching transistors. This intermediary function ensures that the switching transistors cannot be simultaneously turned on, preventing pixel damage while allowing the SEAV method to operate
Data Source
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AI summary
A display device (100) includes a display panel (110) including data lines (DL), scan lines (SCAN), and pixels (PX), a scan driver (120) configured to provide a scan signal to the pixels through the scan lines, a data driver (130) configured to provide data signal to the pixels through the data lines, a voltage generator (140) configured to provide an on-bias voltage to the pixels through the data lines, a timing controller (150) configured to generate a first control signal (CTL1) that controls the data driver and a second control signal (CTL2) that controls the voltage generator, and a protection circuit (160) configured to generate a first protection signal (CTLP1) and a second protection signal (CTLP2) and prevent an overlapping output of the data signal and the on-bias voltage based on the first control signal and the second control signal.