US 11,705,069 B2
Data voltage compensation method, a display driving method, and a display apparatus
Song Meng, Beijing (CN); Zhongyuan Wu, Beijing (CN); and Fei Yang, Beijing (CN)
Assigned to BOE Technology Group Co., Ltd., Beijing (CN)
Filed by BOE TECHNOLOGY GROUP CO., LTD., Beijing (CN)
Filed on Sep. 6, 2021, as Appl. No. 17/467,365.
Application 17/467,365 is a continuation of application No. 16/063,916, granted, now 11,138,935, previously published as PCT/CN2017/116541, filed on Dec. 15, 2017.
Claims priority of application No. 201710336094.3 (CN), filed on May 12, 2017; and application No. 201710744950.9 (CN), filed on Aug. 25, 2017.
Prior Publication US 2021/0407421 A1, Dec. 30, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. G09G 3/3258 (2016.01); G09G 3/3291 (2016.01)
CPC G09G 3/3258 (2013.01) [G09G 3/3291 (2013.01); G09G 2320/029 (2013.01); G09G 2330/12 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A method for compensating data voltages in a display apparatus, wherein the display apparatus includes multiple pixel circuits respectively associated with multiple sub-pixels, and a respective one of the multiple pixel circuits includes at least a driving transistor, an organic light-emitting diode (OLED), and a sense line coupled to the driving transistor and the OLED, the method for individually compensating a data voltage to be applied to the one of the multiple pixel circuits comprising:
applying a testing voltage to a gate electrode of the driving transistor for charging the sense line in a floating state up to a first time period to determine a first monitoring voltage associated with the sense line, wherein the testing voltage is set to be a sum of the threshold voltage and a first setting voltage;
obtaining a threshold voltage of the driving transistor in the one of the multiple pixel circuits by applying a second setting voltage to the gate of the driving transistor to charge the sense line in a floating state up to a second time period to determine a second monitoring voltage associated with the sense line; and
compensating a data voltage to be applied to the one of the multiple pixel circuits based on the first monitoring voltage and the threshold voltage;
wherein the first time period and the second time period are discrete different time periods, the first time period being shorter than the second time period;
wherein the compensating the data voltage comprises dividing the data voltage to be applied to the one of the multiple pixel circuits by a first parameter and adding a second parameter to obtain a compensated data voltage, wherein the first parameter is equal to a square root of the first monitoring voltage divided by a first constant and the second parameter is equal to a sum of the threshold voltage and a second constant.
 
9. A method for driving a display apparatus, the display apparatus including multiple pixel circuits, a respective one of the multiple pixel circuits including a driving transistor, an organic light-emitting diode (OLED), and a sense line coupled to the driving transistor and the OLED, the method comprising:
applying a testing voltage individually to a gate of a driving transistor in a pixel circuit of the multiple pixel circuits, the testing voltage being a sum of a threshold voltage of the driving transistor and a first setting voltage;
charging the sense line in a floating state and coupled to the driving transistor by charges induced by the testing voltage for a first time period;
converting the charges accumulated over the first time period to obtain a first monitoring voltage associated with the sense line, wherein the first monitoring voltage and the testing voltage are used to deduce one or more compensation parameters individually associated with the pixel circuit and used to compensate a data voltage to be applied to the pixel circuit for controlling the OLED thereof to emit light for displaying a subpixel image;
applying a second setting voltage to the gate of the driving transistor in the pixel circuit;
charging the sense line in a floating state and coupled to the driving transistor by charges induced by the second setting voltage; and
converting the charges accumulated over a second time period to obtain a second monitoring voltage associated with the sense line; and
compensating a data voltage to be applied to the one of the multiple pixel circuits based on the first monitoring voltage and the threshold voltage;
wherein the first time period and the second time period are discrete different time periods, the first time period being shorter than the second time period;
wherein the compensating the data voltage comprises dividing the data voltage to be applied to the one of the multiple pixel circuits by a first parameter and adding a second parameter to obtain a compensated data voltage, wherein the first parameter is equal to a square root of the first monitoring voltage divided by a first constant and the second parameter is equal to a sum of the threshold voltage and a second constant.
 
15. A data voltage compensation apparatus of a display apparatus, the display apparatus including multiple pixel circuits, a respective one of the multiple pixel circuits including a driving transistor, an organic light-emitting diode (OLED), and a sense line coupled to the driving transistor and the OLED, the compensation apparatus comprising a compensator circuit coupled to a respective one of the multiple pixel circuits, wherein the compensator circuit is configured to:
apply a testing voltage to a gate of the driving transistor for charging the sense line in a floating state up to a first time period to determine a first monitoring voltage associated with the sense line, wherein the testing voltage is set to be a sum of the threshold voltage and a first setting voltage;
obtain a threshold voltage individually associated with the driving transistor in one of the multiple pixel circuits by applying a second setting voltage to the gate of the driving transistor to charge the sense line up to a second time period to determine a second monitoring voltage associated with the sense line; and
compensate a data voltage to be applied to the pixel circuit based on the first monitoring voltage and the threshold voltage by dividing the data voltage to be applied to the one of the multiple pixel circuits by a first parameter and adding a second parameter to obtain a compensated data voltage;
wherein the first time period and the second time period are discrete different time periods, the first time period being shorter than the second time period;
wherein the first parameter is equal to a square root of the first monitoring voltage divided by a first constant and the second parameter is equal to a sum of the threshold voltage and a second constant.