OLED Driving Transistor Source Voltage Sensing Range Control
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Solution Overview
Problem
The existing OLED display devices face challenges in properly compensating for the deterioration of organic light emitting diodes due to variations in threshold voltage and electron mobility of driving transistors, especially at different temperatures, which can lead to improper sensing data supply when the source voltage exceeds the ADC range.
Innovation Solution
An OLED device with a display panel connected to data lines, scan lines, and reference voltage lines, incorporating an analog-to-digital converter that senses voltages through reference voltage lines and outputs digital data, and a reference voltage generator that adjusts the sensing timing based on the display panel's temperature to prevent voltage range exceedance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the sensing timing is maintained at a fixed point, then the sensing process is simple, but the source voltage may exceed the ADC range when temperature is high, making proper compensation difficult
Solution Approach 1:
The sensing timing is changed from a fixed point to a dynamic timing that varies with temperature. The controller adjusts the sensing timing based on temperature information, ensuring the source voltage remains within the ADC sensing range at different temperatures while maintaining reliable compensation.
Solution Approach 2:
The sensing timing parameter is adjusted according to temperature conditions. By changing the timing parameter dynamically based on temperature, the system ensures accurate voltage sensing within the ADC range without requiring complex additional circuitry.
2Ease of manufacture
If a preset data voltage is supplied to each pixel for compensation, then the compensation process can be initiated, but the source voltage may rise above the ADC sensing range at high temperatures, preventing proper sensing
Solution Approach 1:
Temperature information is obtained in advance before the sensing process. The controller uses this preliminary temperature data to adjust the sensing timing, ensuring that when the sensing operation occurs, the source voltage will be within the ADC range, thus enabling proper voltage detection.
Solution Approach 2:
The system uses temperature feedback to adjust the sensing timing. By continuously monitoring temperature and adjusting the sensing timing accordingly, the system ensures the source voltage remains within the measurable range of the ADC, solving the detection difficulty.
Data Source
AI summary
Disclosed is an OLED device which is capable of preventing a source voltage of a driving transistor so as to compensate for a deterioration of an organic light emitting diode from being out of a sensing voltage range of an analog-to-digital converter, and a method for driving the same, wherein a sensing timing is controlled in such a way that the source voltage of the driving transistor sensed for a sensing mode is included within the sensing voltage range. Accordingly, it is possible to prevent the source voltage of the driving transistor from being out of the sensing voltage range of the analog-to-digital converter.