Abstract: A light-emitting device, a display panel, and a display apparatus. The light-emitting device comprises a first sub-pixel region, a second sub-pixel region, and a third sub-pixel region. The light-emitting device comprises a cathode (10), an anode (30), and a light-emitting structure (20) provided between the cathode (10) and the anode (30). The light-emitting structure (20) comprises a light-emitting layer (21); and the light-emitting layer (21) comprises a single first light-emitting body (211) located in the first sub-pixel region, at least two second light-emitting bodies (212) located in the second sub-pixel region and arranged in a stacked manner, and at least two third light-emitting bodies (213) located in the third sub-pixel region and arranged in a stacked manner. The cathode (10) is used for providing electrons, and the anode (30) is used for providing holes.

Abstract: A pixel arrangement structure, a display panel, a display apparatus and a mask group are provided. The pixel arrangement structure includes: basic pixel units in first and/or second directions. Each basic pixel unit includes five sub-pixels, first to third sub-pixels are of different colors, and third to fifth sub-pixels are of a same color; the first sub-pixel includes opposite first and second sides in the first direction, and opposite third and fourth sides in the second direction; and the second sub-pixel is on and separated from the third side of the first sub-pixel, the third sub-pixel is on and separated from the first side of the first sub-pixel, fourth and fifth sub-pixels are both on the fourth side of the first sub-pixel and are separated from the fourth side of the first sub-pixel, and are separated from each other in the first direction.

Abstract: A method and device of compensating a brightness for a display device and a method and device of driving a display device are provided. The method of compensating a brightness includes: acquiring display brightness data of multiple frames of pictures displayed after a display picture of the display device is switched from a first grayscale value to a second grayscale value; determining a brightness coefficient of each frame of picture according to the display brightness data; determining a reference picture and at least one frame of to-be-compensated picture according to the brightness coefficient; and determining a grayscale compensation value, so that a ratio of a display brightness of each frame of to-be-compensated picture displayed by the display device to a display brightness of the reference picture displayed by the display device is greater than or equal to a preset first brightness threshold.

Abstract: A driving method includes, at a first display brightness value, inputting a pulse-width modulation signal with a duty ratio of X, and controlling a light-emitting driving current of a sub-pixel unit to be M, wherein X and M are obtained according to a first modulation rule; and at a second display brightness value, inputting the pulse-width modulation signal with a duty ratio of Y1, and controlling the light-emitting driving current of the sub-pixel unit to be N1, wherein the first display brightness value is greater than the second one, wherein, when the duty ratio and the light-emitting driving current corresponding to the second display brightness value are obtained according to the first modulation rule, the duty ratio corresponding to the second display brightness value is Y2, the light-emitting driving current corresponding to the second display brightness value is N2, Y1 is smaller than Y2, and N1 is greater than N2.

Abstract: A method and device of compensating a brightness for a display device and a method and device of driving a display device are provided. The method of compensating a brightness includes: acquiring display brightness data of multiple frames of pictures displayed after a display picture of the display device is switched from a first grayscale value to a second grayscale value; determining a brightness coefficient of each frame of picture according to the display brightness data; determining a reference picture and at least one frame of to-be-compensated picture according to the brightness coefficient; and determining a grayscale compensation value, so that a ratio of a display brightness of each frame of to-be-compensated picture displayed by the display device to a display brightness of the reference picture displayed by the display device is greater than or equal to a preset first brightness threshold.

Abstract: A driving method includes, at a first display brightness value, inputting a pulse-width modulation signal with a duty ratio of X, and controlling a light-emitting driving current of a sub-pixel unit to be M, wherein X and M are obtained according to a first modulation rule; and at a second display brightness value, inputting the pulse-width modulation signal with a duty ratio of Y1, and controlling the light-emitting driving current of the sub-pixel unit to be N1, wherein the first display brightness value is greater than the second one, wherein, when the duty ratio and the light-emitting driving current corresponding to the second display brightness value are obtained according to the first modulation rule, the duty ratio corresponding to the second display brightness value is Y2, the light-emitting driving current corresponding to the second display brightness value is N2, Y1 is smaller than Y2, and N1 is greater than N2.

Abstract: A fast method for batch screening diamonds includes placing diamonds on a worktable, turning on a light source arranged on one side of the worktable to shed light on the diamonds where the light includes visible light, photographing the diamonds on the worktable through an imager to obtain a basal image showing the distribution of the diamonds, switching the light source to shortwave UV light with a wavelength ranging from 180 nm to 250 nm, maintaining the light source in work condition for a period of time and then turn it off, photographing the diamonds on the worktable through the imager to obtain a phosphorescence distribution image showing phosphorescent diamonds, overlapping the basal image with the phosphorescence distribution image to obtain a phosphorescence comparison map, marking the phosphorescent diamonds on the phosphorescence comparison map through image recognition technology, and then picking out the phosphorescent diamonds as suspicious diamonds.

Abstract: A fast method for batch screening diamonds includes placing diamonds on a worktable, turning on a light source arranged on one side of the worktable to shed light on the diamonds where the light includes visible light, photographing the diamonds on the worktable through an imager to obtain a basal image showing the distribution of the diamonds, switching the light source to shortwave UV light with a wavelength ranging from 180 nm to 250 nm, maintaining the light source in work condition for a period of time and then turn it off, photographing the diamonds on the worktable through the imager to obtain a phosphorescence distribution image showing phosphorescent diamonds, overlapping the basal image with the phosphorescence distribution image to obtain a phosphorescence comparison map, marking the phosphorescent diamonds on the phosphorescence comparison map through image recognition technology, and then picking out the phosphorescent diamonds as suspicious diamonds.

Abstract: A reflectance spectroscopy measuring and sampling system for gemstone testing is disclosed. The system includes a first light source (1), a second light source (2), a light filtering element, an integrating sphere (S), an optical fiber (9), a spectroscopic detection module (10), an analog-digital conversion module (11) and a data processing terminal (12), wherein the integrating sphere (S) is provided with an entrance port, a sampling opening (6) and a reflected light exit port (7). A reflectance spectroscopy measuring and sampling method for gemstone testing is also disclosed. The system and the method have an excellent performance and can be widely used in the gemstone identification.

Abstract: A reflectance spectroscopy measuring and sampling system for gemstone testing is disclosed. The system includes a first light source (1), a second light source (2), a light filtering element, an integrating sphere (S), an optical fiber (9), a spectroscopic detection module (10), an analog-digital conversion module (11) and a data processing terminal (12), wherein the integrating sphere (S) is provided with an entrance port, a sampling opening (6) and a reflected light exit port (7). A reflectance spectroscopy measuring and sampling method for gemstone testing is also disclosed. The system and the method have an excellent performance and can be widely used in the gemstone identification.