Abstract: A display panel and a display device. The display panel includes a substrate, a light-emitting layer and a light adjusting layer. The light-emitting layer includes a plurality of light-emitting units formed on a side of the substrate. The light adjusting layer is arranged on a side of the light-emitting layer away from the substrate and includes a first adjusting layer and a second adjusting layer, the first adjusting layer and the second adjusting layer are alternately stacked along a direction away from the substrate, a refractive index of the first adjusting layer is less than a refractive index of the second adjusting layer, and the first adjusting layer is arranged on each of an end of the light adjusting layer close to the substrate and an end of the light adjusting layer away from the substrate.

Abstract: A light-emitting device, a material screening method and a display panel. The light-emitting device of a first aspect of the present application includes a light-emitting layer including a host material and a guest material. When a carrier is injected into the light-emitting layer, there is a defect energy Et between the host material and the guest material, and an absolute value of the defect energy Et is greater than or equal to 0.03 eV. A light-emitting efficiency of the light-emitting device in a high-luminance state is improved and an operating voltage of the light-emitting device is reduced, which can ensure a display quality of the display panel in the high-luminance state and reduce an overall power consumption of the display panel.

Abstract: A depth obtaining component includes a laser driver array and a laser array. The laser array includes a plurality of lasers. The laser driver array includes one or more control units, and each control unit is configured to control selection of one or more lasers in the laser array. The one or more control units are disposed in a charge loop of the laser driver array. A laser corresponding to the control unit can be flexibly selected based on a first switch module and a capacitive module in the control unit. In this way, scanning laser emission of the laser array can be implemented based on the laser drive circuit, no scanning device such as a micro electro mechanical systems mirror needs to be additionally disposed, and circuit support can be provided for implementing a small-sized, power-efficient, and cost-effective optical transmit end.