Display backboard, display panel and display device

Abstract

The invention provides a display backboard, a display panel and a display device. The display backboard comprises: a substrate; a pixel defining layer arranged on one side of the substrate and provided with a plurality of first openings and a plurality of second openings; anode layers disposed in the first openings; auxiliary cathodes disposed in the second openings; and a light-emitting layer which covers the pixel defining layer and the anode and is provided with a plurality of laser openings, wherein the orthographic projections of the laser openings on the substrate partially coincide withthe orthographic projections of the auxiliary cathodes on the substrate, the distance between every two adjacent laser holes in the second direction is gradually decreased in the first direction, andthe second direction and the first direction are arranged in a crossed mode. According to the display backboard provided by the invention, the longitudinal density of the plurality of laser holes which are formed in the light-emitting layer and used for connecting the auxiliary cathode and the cathode is gradually increased, so that the punching time of laser punching can be shortened, the yieldcan be improved, and meanwhile, the brightness uniformity and the display quality of the display backboard can also be improved.

Description

technical field [0001] The present invention relates to the field of display technology, and in particular, the present invention relates to a display backplane, a display panel and a display device. Background technique [0002] Existing organic light emitting diode (OLED) devices are usually composed of an anode layer, a light-emitting layer and a cathode layer, and can be divided into bottom emission and top emission according to the different light-emitting surfaces. Among them, the aperture ratio of the top emission device is larger. , which has become a research hotspot in recent years. The top emission OLED needs a thinner cathode and a reflective anode to increase the light transmittance. However, the 1-12nm thin transparent cathode has a larger square resistance, which will lead to a serious increase in the voltage drop (IR Drop), so there will be The farther away from the power supply point, the more obvious the voltage drop, which leads to the obvious unevenness ...

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Problems solved by technology

However, for designs that require laser drilling more than 5 million times, the drilling efficiency is still relatively low, so the drilling time (tact time) required for drilling is relatively long, and, refer to Figure 8 , even if the face-down (Face down) method is used for laser drilling, there will still be dust pollution, resulting in a low yield rate. Therefore, how to ensure high drilling efficiency and high yield rate within the pressure drop difference (Spec) is important. Zhongzhi

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