CN-117475871-B - Display panel compensation method and display panel

CN117475871BCN 117475871 BCN117475871 BCN 117475871BCN-117475871-B

Abstract

The application discloses a compensation method of a display panel and the display panel, the compensation method comprises the steps of selecting a rectangular test area in a display area of the display panel, obtaining a first average current value flowing through all sensing transistors and a second average current value flowing through all driving transistors in the rectangular test area, obtaining a first current curve and a second current curve flowing through the driving transistors based on the first average current value and the second average current value under different driving voltages, determining transmission loss coefficients of data signals according to the first current curve and the second current curve, and compensating driving voltages of all pixel circuits in the rectangular test area based on the transmission loss coefficients, wherein the transmission loss coefficients can compensate the transmission loss of the driving voltages of all pixel circuits, and further can ensure that the luminous current flowing through the driving transistors in a luminous stage is ideal without causing a phenomenon of brightness deviation.

Inventors

Request for anonymity

Assignees

深圳市华星光电半导体显示技术有限公司

Dates

Publication Date: 20260512
Application Date: 20230131

Claims (10)

1. A compensation method for a display panel, the compensation method comprising: Selecting one rectangular test area in a display area of the display panel, wherein one or more pixel circuits are arranged in each rectangular test area, each pixel circuit comprises a driving transistor and a sensing transistor, and a first pole of the sensing transistor is connected with a source electrode of the driving transistor; Acquiring first average current values flowing through all the sensing transistors and second average current values flowing through all the driving transistors in the rectangular test area; Obtaining a first current curve and a second current curve flowing through the driving transistor based on the first average current value and the second average current value under different driving voltages, wherein the driving voltage is a gate-source voltage difference of the driving transistor, the first current curve is a current curve corresponding to the gate-source voltage difference of the driving transistor before a light-emitting stage, and the second current curve is a current curve corresponding to the gate-source voltage difference of the driving transistor in the light-emitting stage; determining a transmission loss coefficient of a data signal according to the first current curve and the second current curve; and compensating the driving voltage of each pixel circuit in the rectangular test area based on the transmission loss coefficient.
2. The compensation method according to claim 1, wherein the step of obtaining a first current curve and a second current curve flowing through the driving transistor based on the first average current value and the second average current value at different driving voltages includes: Obtaining a first current and a second current flowing through the driving transistor under the driving voltage based on a first average current value and a second average current value under the driving voltage; and fitting to obtain the first current curve and the second current curve according to the first current and the second current under different driving voltages.
3. The compensation method according to claim 2, wherein the step of obtaining the first current and the second current flowing through the driving transistor at the driving voltage based on the first average current value and the second average current value at the driving voltage includes: Obtaining a first current flowing through the driving transistor under the driving voltage based on a first average current value under the driving voltage; and obtaining a second current flowing through the driving transistor under the driving voltage based on the first average current value and the second average current value under the driving voltage.
4. A compensation method according to claim 3, wherein the step of obtaining the first current flowing through the driving transistor at the driving voltage based on the first average current value at the driving voltage comprises: and determining the first current according to the number of lines of the pixel circuits in the rectangular test area, the number of columns of the pixel circuits in the rectangular test area, the number of vertical effective display lines of the display panel, the number of vertical blank lines of the display panel, the number of precharge lines and the first average current value.
5. The compensation method of claim 4, wherein the step of determining the first current according to the number of rows of the pixel circuits in the rectangular test area, the number of columns of the pixel circuits in the rectangular test area, the number of vertical effective display rows of the display panel, the number of vertical blank rows of the display panel, the number of precharge rows, and the first average current value comprises: Configuring the column number of the pixel circuits in the rectangular test area as m, the line number of the pixel circuits in the rectangular test area as n, the vertical effective display line number as v_act, the vertical blank line number as v_blk, the precharge line number as h, the first average current value as I1 and the first current as Ids (wr); determining the first current according to a first formula, the first formula being as follows: I1=Ids(wr)*m*h*n÷(v_act+v_blk)。
6. The compensation method according to claim 5, wherein the step of obtaining the second current flowing through the driving transistor at the driving voltage based on the first average current value and the second average current value at the driving voltage includes: Determining the second current according to the number of lines of the pixel circuits in the rectangular test area, the number of columns of the pixel circuits in the rectangular test area, the number of vertical effective display lines of the display panel, the number of vertical blank lines of the display panel, the number of precharge lines, the first average current value and the second average current value.
7. The compensation method of claim 6, wherein the step of determining the second current according to the number of rows of the pixel circuits in the rectangular test area, the number of columns of the pixel circuits in the rectangular test area, the number of vertical effective display rows of the display panel, the number of vertical blank rows of the display panel, the number of precharge rows, the first average current value, and the second average current value comprises: Configuring the second average current value to be I2 and the second current to be Ids (em); determining the first current according to a second formula, the second formula being as follows: I2=I1+Ids(em)*m*(v_act+v_blk-h)*n÷(v_act+v_blk)。
8. The compensation method according to any one of claims 1 to 7, wherein the step of determining a transmission loss factor of the data signal from the first current curve and the second current curve comprises: determining a first driving voltage in the first current curve and a second driving voltage in the second current curve under the same current value according to the first current curve and the second current curve; the transmission loss factor is determined as a ratio of the second driving voltage to the first driving voltage.
9. The compensation method according to claim 8, wherein the step of compensating the driving voltage of each pixel circuit in the rectangular test area based on the transmission loss coefficient comprises: configuring the transmission loss coefficient as a and the driving voltage of the pixel circuit in the writing stage before uncompensated as Vgs (wr); and taking a Vgs (wr) as a driving voltage of the pixel circuit in a light emitting stage.
10. A display panel, characterized in that the display panel performs the compensation method according to any of claims 1-9.

Description

Display panel compensation method and display panel Technical Field The application relates to the technical field of display, in particular to a compensation method of a display panel and the display panel. Background In the writing stage of the pixel circuit, the gate of the driving transistor and the source of the driving transistor are respectively written with corresponding potentials to realize an ideal light emitting effect. However, during writing, transmission loss occurs, causing an undesirable light emitting effect. Disclosure of Invention The application provides a compensation method of a display panel and the display panel, which are used for relieving the technical problem that the brightness is deviated due to the transmission loss of a data signal. The application provides a compensation method of a display panel, which comprises the steps of selecting a rectangular test area in a display area of the display panel, wherein one or more pixel circuits are arranged in each rectangular test area, each pixel circuit comprises a driving transistor and a sensing transistor, a first electrode of the sensing transistor is connected with a source electrode of the driving transistor, obtaining first average current values flowing through all the sensing transistors and second average current values flowing through all the driving transistors in the rectangular test area, obtaining a first current curve and a second current curve flowing through the driving transistor based on the first average current values and the second average current values under different driving voltages, driving voltage is a gate-source voltage difference of the driving transistor, the first current curve is a current curve corresponding to the gate-source voltage difference of the driving transistor before a light-emitting stage, the second current curve is a current curve corresponding to the gate-source voltage difference of the driving transistor in the light-emitting stage, determining transmission loss coefficients of data signals according to the first current curve and the second current curve, and compensating the driving voltage of each pixel circuit in the rectangular test area based on the transmission loss coefficients. In some embodiments, the step of obtaining a first current curve and a second current curve of the driving transistor based on a first average current value and a second average current value under different driving voltages comprises obtaining a first current and a second current of the driving transistor under the driving voltage based on the first average current value and the second average current value under one driving voltage, and fitting to obtain the first current curve and the second current curve according to the first current and the second current under different driving voltages. In some embodiments, the step of obtaining the first current and the second current flowing through the driving transistor under the driving voltage based on the first average current value and the second average current value under the driving voltage comprises obtaining the first current flowing through the driving transistor under the driving voltage based on the first average current value and the second average current value under the driving voltage, and obtaining the second current flowing through the driving transistor under the driving voltage based on the first average current value and the second average current value under the driving voltage. In some embodiments, the step of obtaining the first current flowing through the driving transistor under the driving voltage based on the first average current value under the driving voltage includes determining the first current according to the number of rows of the pixel circuits in the rectangular test area, the number of columns of the pixel circuits in the rectangular test area, the number of vertical effective display rows of the display panel, the number of vertical blank rows of the display panel, the number of precharge rows, and the first average current value. In some embodiments, the step of determining the first current according to the number of rows of the pixel circuits in the rectangular test area, the number of columns of the pixel circuits in the rectangular test area, the number of vertical effective display rows of the display panel, the number of vertical blank rows of the display panel, the number of pre-charge rows and the first average current value comprises configuring the number of columns of the pixel circuits in the rectangular test area as m, the number of rows of the pixel circuits in the rectangular test area as n, the number of vertical effective display rows as v_act, the number of vertical blank rows as v_blk, the number of pre-charge rows as h, the first average current value as I1 and the first current as Ids (wr), wherein the first current is determined according to a first formula as follows: I1=Ids(wr)*m*h*n÷(v_ac