Method and device for obtaining compensation parameter for pixel data and AMOLED display panel

A device for obtaining a compensation parameter for pixel data, comprising:

• a first sensing voltage value obtaining circuit, configured to obtain a sensing voltage value of a driving transistor in each of pixel units in an AMOLED display screen in a first state;
• a second sensing voltage value obtaining circuit, configured to obtain a sensing voltage value of the driving transistor in each of the pixel units in a second state, the sensing voltage value refers to a potential value at a terminal of the driving transistor couple to a display diode after pixel data is written into the driving transistor;
• and
• a compensation parameter determining circuit, configured to determine a compensation parameter of pixel data of each of the pixel units based on the sensing voltage values in the first state and the second state;
• the compensation parameter is configured for compensating the pixel data in a subsequent display process, wherein
• the first sensing voltage value obtaining circuit is further configured to write fixed pixel data into the driving transistors in the pixel units, respectively;
• and
• obtain a first sensing voltage value of each of the driving transistors when the driving transistor operates in a saturation state, and wherein
• the compensation parameter determining circuit is further configured to respectively substitute the fixed pixel data and the first sensing voltage value, the fixed pixel data and the second sensing voltage value, and the dynamic pixel data and the second sensing voltage value into a current formula of the driving transistor to obtain a compensation equation set;
• two unknown quantities comprising an actual threshold voltage and a current coefficient of the driving transistor are included in the compensation equation set;
• and to determine the actual threshold voltage and the current coefficient based on the compensation equation set, wherein the compensation parameter includes the actual threshold voltage and the current coefficient.