OLED Compensating Unit Gate Voltage Segmentation for High-Frequency Driving
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Solution Overview
Problem
Existing OLED display devices with compensating units of the 10T1C structure face challenges in maintaining sufficient sensing time for high-frequency driving, leading to reduced display quality and inefficiencies in high-resolution and high-frequency operations.
Innovation Solution
The OLED display device incorporates a compensating unit where two transistors connected to both electrodes of a storage capacitor are driven with an additional gate voltage, ensuring a sensing time of equal to or greater than two horizontal periods, and reduces the number of transistors connected to the gate electrode of the driving transistor to minimize leakage current and flicker.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If two transistors connected to a driving transistor and one transistor connected to a storage capacitor are switched according to one gate1 voltage, then the compensating unit can be implemented with the 10T1C structure, but the sensing time for high frequency driving is reduced
Solution Approach 1:
The gate control voltage is divided into multiple independent gate voltages (gate1, gate2, gate3) that operate at different timing. This segmentation allows the sensing operation to be extended across multiple horizontal periods, thereby increasing the sensing time while maintaining the 10T1C structure complexity.
2Reliability
If multiple transistors are connected to the gate electrode of the driving transistor for compensation, then the threshold voltage can be compensated, but the leakage current increases and flicker occurs in low speed driving
Solution Approach 1:
The connection between transistors and the gate electrode is made dynamic through time-dependent switching. Transistors are connected only during specific periods (first, second, and third horizontal periods) and disconnected during others, converting a static harmful connection into a dynamic controlled connection that eliminates continuous leakage current while maintaining compensation functionality.
3Productivity
If the sensing time is extended to equal to or greater than two horizontal periods, then high speed driving of high resolution and high frequency can be performed, but the device operation becomes more complex
Solution Approach 1:
The gate control operates periodically across multiple horizontal periods with distinct phases: first period for initial connection, second period for intermediate connection, and third period for final connection. This periodic action structure enables extended sensing time for high-speed driving while organizing the complex operations into a systematic repeating pattern.
Data Source
AI summary
An organic light emitting diode display device can include a driving transistor, a first transistor connected to the driving transistor, a second transistor connected between a data voltage and the driving transistor, a third transistor connected between a high level voltage and the driving transistor, a fourth transistor connected to the driving transistor, a fifth transistor connected between an initial voltage and the driving transistor, a sixth transistor connected to the initial voltage, a seventh transistor connected to the high level voltage, an eighth transistor connected to a reference voltage, a storage capacitor connected between the driving transistor and the eighth transistor, and a light emitting diode connected between a low level voltage and the fourth transistor.