OLED Driving Transistor Gate Voltage Pre-biasing for Fast Threshold Compensation
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Solution Overview
Problem
In OLED display panels, the time required to reach an ideal electrical potential at the gate electrode of a driving transistor during voltage threshold compensation is prolonged, hindering high-resolution displays due to a large voltage span needed for the transistor to turn on effectively.
Innovation Solution
A device and method that includes a voltage signal detection module and a threshold compensation signal outputting module, where the inputted image signal is processed by subtracting a preset voltage signal to apply the difference to the gate electrode of the driving transistor, ensuring it turns on before threshold compensation, thereby reducing the time to achieve an ideal gate voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large voltage span is applied to turn on the driving transistor effectively, then the transistor can be turned on, but the time required to reach an ideal electrical potential at the gate electrode is prolonged
Solution Approach 1:
The patent applies a preliminary voltage to the gate electrode before the threshold compensation phase begins. This preliminary voltage is calculated based on the data voltage and transistor threshold voltage characteristics, allowing the transistor to be pre-biased in a partially conductive state. When threshold compensation starts, the transistor quickly reaches its ideal operating point without requiring the full voltage span to be applied during the compensation phase, thus reducing the time to reach ideal gate voltage while maintaining reliable turn-on.
2Manufacturing precision
If the driving transistor is turned on during voltage threshold compensation, then high resolution can be achieved, but the gate voltage must reach ideal level quickly within a short time
Solution Approach 1:
The patent prepares the gate electrode with a preliminary voltage before threshold compensation begins. This pre-applied voltage is derived from the relationship between data voltage and transistor threshold voltage, positioning the gate voltage close to its ideal value before the compensation phase starts. This allows the transistor to reach its ideal operating point quickly during threshold compensation, enabling high-resolution display within the available time frame.
Solution Approach 2:
The patent dynamically adjusts the gate voltage parameter based on the data voltage and transistor characteristics. By calculating and applying a preliminary voltage that accounts for the specific transistor threshold voltage and data voltage level, the gate voltage is positioned optimally before threshold compensation begins. This parameter adjustment ensures the transistor reaches its ideal state quickly, achieving both high resolution and fast response.
Data Source
AI summary
A device and method for applying a data voltage signal, a display panel, and a display device. The device for applying the data voltage signal includes: a voltage signal detection module configured to detect an image signal inputted to a display assembly; and a threshold compensation signal outputting module configured to process the inputted image signal and apply the processed image signal to a gate electrode of a driving transistor so that the driving transistor is turned on before a threshold compensation for the driving transistor is conducted; where, the processed image signal is obtained by subtracting a preset voltage signal from the inputted image signal.