CN-115331622-B - Display panel, brightness compensation method and device of display panel

CN115331622BCN 115331622 BCN115331622 BCN 115331622BCN-115331622-B

Abstract

The invention discloses a display panel, and a brightness compensation method and device for the display panel. The display panel comprises a first display area and a second display area, wherein the first display area is provided with a first pixel circuit, the first pixel circuit comprises a first driving transistor, a first pole of the first driving transistor is connected with a power signal line, a second pole of the first driving transistor is connected with a first light emitting device, a first grid electrode is used for writing data voltage, the first driving transistor further comprises a second grid electrode, the second grid electrode is used for being connected with adjusting voltage, and/or the first pixel circuit further comprises a first transistor, the first transistor is connected between the first grid electrode and the second pole of the first driving transistor, the first transistor comprises a third grid electrode and a fourth grid electrode, the third grid electrode is used for writing scanning signals, and the fourth grid electrode is used for being connected with adjusting voltage. The display uniformity of the first display area and the second display area can be improved, and the display effect of the display panel is further improved.

Inventors

YAO YUAN
ZHU XIUJIAN

Assignees

合肥维信诺科技有限公司
昆山国显光电有限公司

Dates

Publication Date: 20260512
Application Date: 20220809

Claims (9)

1. A display panel comprising a non-display region, a first display region, and a second display region at least partially surrounding the first display region, the first display region having a light transmittance that is greater than a light transmittance of the second display region; The first display area is provided with a first pixel circuit, the first pixel circuit comprises a first driving transistor, the first driving transistor comprises a first pole, a second pole and a first grid electrode, the first pole of the first driving transistor is connected with a power signal line, and the second pole of the first driving transistor is connected with a first light emitting device; The first driving transistor further includes a second gate; the first pixel circuit further comprises a first transistor, wherein the first transistor is connected between the first gate and the second pole of the first driving transistor, the first transistor comprises a third gate and a fourth gate, the third gate is used for accessing a scanning signal, and the fourth gate is used for accessing the regulating voltage; the non-display area is provided with a driving chip, the driving chip is used for acquiring first light-emitting data of the first display area and second light-emitting data of the second display area, determining the current of the first driving transistor in the first display area according to first brightness data and a first efficiency attenuation curve, determining the current of the second driving transistor in the second display area according to second brightness data and a second efficiency attenuation curve, and taking the current of the second driving transistor in the second display area as the regulating voltage, wherein the threshold voltage difference of the first driving transistor in the first display area and the second driving transistor in the second display area is determined according to the difference of the current of the first driving transistor in the first display area and the current of the second driving transistor in the second display area, and the back gate voltage difference of the first driving transistor and the second driving transistor in the first display area is determined according to the threshold voltage difference; the first display area is provided with a plurality of first pixel circuits, and each second grid electrode and/or each fourth grid electrode is connected with the driving chip through a conductive wire; the display panel further comprises a first voltage signal line, the second display area is provided with a second pixel circuit, the second pixel circuit comprises a second driving transistor, the second driving transistor comprises a first electrode, a second electrode and a fifth grid electrode, the second driving transistor further comprises a sixth grid electrode, and the sixth grid electrode is connected with the first voltage signal line.
2. The display panel according to claim 1, wherein a first pole of the second driving transistor is connected to the power signal line, a second pole of the second driving transistor is connected to a second light emitting device, and the fifth gate is for writing the data voltage; the display panel further comprises a second voltage signal line, the second pixel circuit further comprises a second transistor, the second transistor is connected between a fifth grid electrode and a second electrode of the second driving transistor, the second transistor comprises a seventh grid electrode and an eighth grid electrode, the seventh grid electrode is used for being connected with the scanning signal, and the eighth grid electrode is connected with the second voltage signal line.
3. The display panel according to claim 2, wherein the power supply signal line is multiplexed as the first voltage signal line.
4. A brightness compensation method of a display panel for compensating the brightness of the display panel according to any one of claims 1 to 3, comprising: Acquiring first luminous data of the first display area and second luminous data of the second display area; Determining an adjustment voltage of the first display area according to the first light-emitting data and the second light-emitting data; adjusting the second gate voltage of the first driving transistor in the first display region according to the adjustment voltage to compensate for the brightness of the first display region, and/or, And adjusting the fourth gate voltage of the first transistor in the first display area according to the adjusting voltage so as to compensate the brightness of the first display area.
5. The method of claim 4, wherein the first lighting data comprises first luminance data and the second lighting data comprises second luminance data, wherein determining the adjustment voltage for the first display region based on the first lighting data and the second lighting data comprises: determining the current of the first driving transistor in the first display area according to the first brightness data and a first efficiency attenuation curve, wherein the first efficiency attenuation curve is an efficiency attenuation curve of a first light-emitting unit in the first display area; Determining the current of a second driving transistor in the second display area according to the second brightness data and a second efficiency attenuation curve, wherein the second efficiency attenuation curve is an efficiency attenuation curve of a second light-emitting unit in the second display area; And determining the regulating voltage of the first display area according to the difference between the current of the first driving transistor in the first display area and the current of the second driving transistor in the second display area.
6. The method of claim 5, further comprising, prior to determining the adjustment voltage for the first display region based on the first emission data and the second emission data: acquiring a first accumulated light-emitting time of the first light-emitting unit in the first display area and a second accumulated light-emitting time of the second light-emitting unit in the second display area; determining the first efficiency decay curve according to the first accumulated lighting time; and determining the second efficiency decay curve according to the second accumulated lighting time.
7. The method of claim 4, wherein the display panel comprises a pixel cell comprising light emitting cells of at least two colors of light emission, wherein the first light emitting data comprises first chromaticity data and the second light emitting data comprises second chromaticity data, wherein determining the adjustment voltage for the first display region based on the first light emitting data and the second light emitting data comprises: determining the light-emitting brightness of the light-emitting units with different light-emitting colors in the first display area and the second display area according to the first chromaticity data and the second chromaticity data; Determining the current difference of the driving transistor in the first display area and the second display area according to the luminous brightness and the efficiency decay curves of the luminous units with different luminous colors; and determining the regulating voltage of the first display area according to the current difference.
8. The method of claim 4, wherein the first display area comprises at least two sub-areas, each sub-area comprising at least one of the pixel circuits, and wherein the adjustment voltages corresponding to different sub-areas are different.
9. A brightness compensation device for a display panel for compensating the brightness of the display panel according to any one of claims 1-3, comprising: The acquisition module is used for acquiring first luminous data of the first display area and second luminous data of the second display area; a determining module for determining an adjustment voltage of the first display area according to the first light emission data and the second light emission data; A compensation module for adjusting the second gate voltage of the first driving transistor in the first display area according to the adjustment voltage to compensate the brightness of the first display area, and/or, And adjusting the fourth gate voltage of the first transistor in the first display area according to the adjusting voltage so as to compensate the brightness of the first display area.

Description

Display panel, brightness compensation method and device of display panel Technical Field The embodiment of the invention relates to the technical field of display, in particular to a display panel, and a brightness compensation method and device of the display panel. Background The current display panel is developing towards the direction of full screen to improve the screen ratio of display panel, improve user's experience impression. In the full screen, a transparent display area with relatively high light transmittance is required to be arranged in the display area for placing the camera and other structures. In order to ensure the light transmittance of the transparent display region, the aperture ratio of the pixels in the transparent display region may be reduced. When the aperture ratio of the pixels in the transparent display area is reduced, the pixels in the transparent display area can be set at the same gray level, and the driving current of the pixels in the transparent display area is larger than that of the pixels in the conventional display area, so that the transparent display area and the conventional display area have the same brightness and chromaticity, and the display uniformity of the display panel is improved. Because the driving current of the pixels in the transparent display area is larger than that of the pixels in the conventional display area, the current density of the light-emitting devices in the transparent display area is larger, and the aging speed of the light-emitting devices in the transparent display area is higher. As the use time of the display panel increases, the luminous efficiency of the light emitting device in the transparent display area decreases faster than that of the light emitting device in the conventional display area, resulting in different luminous brightness and chromaticity between the transparent display area and the conventional display area, and reducing the display effect of the display panel. Disclosure of Invention The invention provides a display panel, a brightness compensation method and a brightness compensation device for the display panel, which are used for improving the display uniformity of the display panel and improving the display effect of the display panel. In a first aspect, an embodiment of the present invention provides a display panel, including a first display area and a second display area, where the second display area at least partially surrounds the first display area, and a light transmittance of the first display area is greater than a light transmittance of the second display area; The first display area is provided with a first pixel circuit, the first pixel circuit comprises a first driving transistor, the first driving transistor comprises a first pole, a second pole and a first grid electrode, the first pole of the first driving transistor is connected with a power signal line, and the second pole of the first driving transistor is connected with a first light emitting device; The first driving transistor further comprises a second grid electrode, the second grid electrode is used for being connected with a regulating voltage, and/or the first pixel circuit further comprises a first transistor, the first transistor is connected between the first grid electrode and the second pole of the first driving transistor, the first transistor comprises a third grid electrode and a fourth grid electrode, the third grid electrode is used for being used for writing a scanning signal, and the fourth grid electrode is used for being connected with the regulating voltage. Optionally, the display panel further includes a non-display area, the non-display area is provided with a driving chip, the driving chip is used for determining the adjustment voltage according to first light-emitting data of the first display area and second light-emitting data of the second display area, the first display area is provided with a plurality of first pixel circuits, and each second grid and/or each fourth grid is connected with the driving chip through a conductive wire. Optionally, the display panel further comprises a first voltage signal line, wherein the second display area is provided with a second pixel circuit, the second pixel circuit comprises a second driving transistor, the second driving transistor comprises a first pole, a second pole and a fifth grid electrode, the first pole of the second driving transistor is connected with the power signal line, the second pole of the second driving transistor is connected with a second light emitting device, and the fifth grid electrode is used for writing the data voltage; The second driving transistor further comprises a sixth grid electrode, the sixth grid electrode is connected with the first voltage signal line, and/or the display panel further comprises a second voltage signal line, the second pixel circuit further comprises a second transistor, the second transistor is connected betwee