CROSS-REFERENCE TO RELATED APPLICATIONS

This application is the U.S. national phase of PCT Application No. PCT/CN2019/083234 filed on Apr. 18, 2019, which claims priority to Chinese Patent Application No. 201810600688.5 filed on Jun. 12, 2018, which are incorporated herein by reference in their entireties.

TECHNICAL FIELD

The present disclosure relates to the field of display technology, and in particular to an Organic Light-Emitting Diode (OLED) display substrate, a method for manufacturing the same, and a display device.

BACKGROUND

At present, users have increasingly higher requirements for display devices, and most of them require the display devices to be lighter, thinner, brighter, and more energy efficient. Since an OLED display is self-luminous, and can achieve a display function without any additional backlight, it has become a premier choice of a lighter and thinner display. Meanwhile, there is an increasing market demand for specially-shaped displays, including display products with rounded corners, such as round watches, square displays with rounded corners, etc.

However, when a traditional circular OLED display is performing display, a jagged shape can appear at an edge of the circular display area, which will negatively affect a viewing experience of a user. In order to solve this problem, in many OLED displays, a driver Integrated Circuit (IC) is used to perform pixel compensation at the edge of the circular display area to alleviate the problem of the appearance of the jagged shape. However, this will increase power consumption of the driver IC as well as the cost of the OLED display.

SUMMARY

In a first aspect, embodiments of the present disclosure provide a display substrate, including a plurality of sub-pixels, which includes one or more first sub-pixels located in an effective display area of the display substrate, and one or more second sub-pixels located at a boundary of the effective display area of the display substrate. The second sub-pixel includes a first portion in the effective display area and a second portion outside the effective display area. The second portion does not emit light when the display substrate is performing display.

According to some embodiments of the present disclosure, the display substrate is an OLED display substrate.

According to some embodiments of the present disclosure, the sub-pixel includes an anode, a cathode, and an organic light-emitting layer located between the anode and the cathode, and in the second portion, the anode and the organic light-emitting layer are separated from each other by an insulating layer.

According to some embodiments of the present disclosure, the sub-pixel includes an anode, a cathode, and an organic light-emitting layer located between the anode and the cathode, and in the second portion, the cathode and the organic light-emitting layer are separated from each other by an insulating layer.

According to some embodiments of the present disclosure, the insulating layer includes a light-shielding material.

According to some embodiments of the present disclosure, the insulating layer includes an organic resin material.

According to some embodiments of the present disclosure, the insulating layer is in a same layer and made of a same material as a spacer of the display substrate.

According to some embodiments of the present disclosure, the effective display area has a boundary extending along a non-linear trace.

According to some embodiments of the present disclosure, the effective display area has a shape of a circle, an oval, a ring, a rectangle with rounded corners, an arc, or a hexagon.

According to some embodiments of the present disclosure, the sub-pixels are rectangular, square, diamond-shaped, or circular.

In a second aspect, embodiments of the present disclosure provide a display device including the display substrate as described in the first aspect.

According to some embodiments of the present disclosure, the display substrate is an OLED display substrate, and the display device is an OLED display device.

In a third aspect, embodiments of the present disclosure provide a method for manufacturing a display substrate which includes a plurality of sub-pixels, each of which includes an anode, a cathode, and an organic light-emitting layer located between the anode and the cathode. The plurality of sub-pixels includes one or more first sub-pixels located in an effective display area of the display substrate, and one or more second sub-pixels located at a boundary of the effective display area of the display substrate. The second sub-pixel includes a first portion in the effective display area and a second portion outside the effective display area. The method includes: forming an insulating layer between the anode and the organic light-emitting layer in the second portion; and/or forming an insulating layer between the cathode and the organic light-emitting layer in the second portion.

According to some embodiments of the present disclosure, the display substrate is an OLED display substrate.

According to some embodiments of the present disclosure, the insulating layer and a spacer of the display substrate are formed by a single patterning process.

According to some embodiments of the present disclosure, when in the second portion, the insulating layer is located between the anode and the organic light-emitting layer, the insulating layer is prepared after a pixel-defining layer of the display substrate has been formed.

According to some embodiments of the present disclosure, when in the second portion, the insulating layer is located between the cathode and the organic light-emitting layer, the insulating layer is prepared after the organic light-emitting layer has been formed and before the cathode is to be formed.

