Display substrate and display device

Abstract

The invention discloses a display substrate and a display device, the display substrate comprises a driving structure layer and a light-emitting structure layer which are sequentially stacked on a substrate, and the light-emitting structure layer comprises a first electrode layer, a pixel defining layer, a water-oxygen barrier layer, an organic functional layer and a second electrode layer; the first electrode layer comprises a plurality of first electrodes arranged on the driving structure layer, the pixel defining layer is arranged on the sides, away from the substrate, of the first electrodes and provided with a plurality of first pixel openings, and each first pixel opening exposes the surface, away from the substrate, of the corresponding first electrode; the water oxygen barrier layer is at least partially arranged on the circumferential side wall of the first pixel opening; the organic functional layer comprises an organic light-emitting layer, and the organic functional layer and the second electrode layer are sequentially stacked on the side, away from the substrate, of the first electrode. The display substrate provided by the embodiment of the invention can prevent water and oxygen volatilized by the pixel defining layer from invading the organic light-emitting layer.

Description

technical field [0001] Embodiments of the present disclosure relate to the field of display technology, and in particular to a display substrate and a display device. Background technique [0002] Some organic light-emitting diode (OLED) display products need to be sold to high-altitude areas, where ultraviolet (UV light) radiation is relatively strong, and customers will evaluate the impact of UV radiation on electronic products. Taking a certain model product as an example, when the module screen is on, debug the Normal W255 screen, and test the initial brightness L0 at T0; When testing T580h, the brightness is L580h, L580h / L0<80%, that is, the brightness drops significantly. [0003] The above problems are analyzed as follows: 1. Phenomena analysis, after the module screen is continuously irradiated with UV light for 580 hours, the RGB (red, green and blue) pixels shrink to varying degrees. Taking the B pixel (that is, the blue sub-pixel P1) as an example, the light-...

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Problems solved by technology

2. Root cause analysis, such as figure 2 as shown, figure 2 A schematic diagram of a partial cross-sectional structure of a display substrate for some technologies, when using UV light ( figure 2 Indicated by the dotted line with the arrow) after long-time irradiation, the pixel defining layer (PDL, material such as polyimide series organic matter) 32 will volatilize water and oxygen ( figure 2 Indicated by a dotted circle), the material of the organic light-emitting layer 36 is sensitive to water and oxygen, and the material of the organic light-emitting layer 36 will fail after absorbing the water and oxygen volatilized by the PDL layer 32. The central position is extended, which eventually causes the pixels to shrink, causing brightness attenuation

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