CROSS REFERENCE TO RELATED APPLICATIONS

The present application is based upon International Application No. PCT/CN2019/078564, filed on Mar. 28, 2019, which is based upon and claims the priority of Chinese Patent Application No. 201810373842.X, filed on Apr. 24, 2018, the entire disclosure of which is hereby incorporated by reference.

TECHNICAL FIELD

The present disclosure relates to the field of display technologies, in particular, relates to an organic light emitting display panel, a manufacturing method thereof and a display device.

BACKGROUND

Top emission display technology is utilized to realize a large-size OLED 8K UHD display, which allows independent fabrication of a TFT back plate and a color film cover plate, and a back-end package pressing process.

In the process of packaging and pressing, firstly, a wall glue (Dam glue) with a certain thickness and width is sprayed along the periphery of a glass substrate. The thickness of the Dam glue and the air pressure at the time of packaging substantially determine the thickness between the upper and lower substrates of the panel. The gap between the upper and lower substrates is filled with a filler (Filler glue). Therefore, for the top emission display, the light emitted by the OLED device needs to pass through a thick Filler (5-7 μm), an insulating cover layer (OC layer), and a color filter layer (CF layer).

SUMMARY

The present disclosure provides an organic light emitting display panel with improved brightness, a manufacturing method thereof, and a display device including the display panel.

An aspect of the present disclosure provides an organic light emitting display panel including a cover plate and a back plate. The cover plate includes a cover plate glass on which three color films of R, G and B are formed, an insulating cover layer covering the cover plate glass, a BM area formed over the insulating cover layer and defining a pixel area, a spacer pillar formed in the BM area, and an auxiliary cathode formed over the spacer pillar and the insulating cover layer. The back plate includes an active layer array, a planarization layer formed on the active layer array and having a boss corresponding to the pixel area, and an OLED device formed on the boss.

In an implementation of the present disclosure, color films between adjacent sub-pixels in respective pixels overlap with each other.

In an implementation of the present disclosure, a width of the overlapping portion of the color films is 3-5 μm.

In an implementation of the present disclosure, the projection of the OLED device and the auxiliary cathode in a direction perpendicular to the display panel does not overlap or does not completely overlap; or the distance of the OLED device from the cover plate glass is less than or equal to the minimum distance of the auxiliary cathode from the cover plate glass; or the projection of the OLED device and the auxiliary cathode in a direction perpendicular to the display panel does not overlap or does not completely overlap and the distance of the OLED device from the cover plate glass is less than or equal to the minimum distance of the auxiliary cathode from the cover plate glass.

Another aspect of the present disclosure also provides a manufacturing method of a display panel. The method includes forming a cover plate and forming a back plate. Forming a cover plate includes: forming three color films of R, G and B on a cover plate glass; forming an insulating cover layer over the cover plate glass on which the three color films of R, Q and B are formed; forming a BM area over the insulating cover layer and defining a pixel area; forming a spacer pillar on the BM area; and depositing a metal layer on the spacer pillar and the insulating cover layer, and etching a trace to form an auxiliary cathode. Forming a back plate includes: forming a planarization layer over an active layer array, the planarization layer having a boss corresponding to the pixel area; and forming an OLED device on the boss.

In an implementation of the present disclosure, forming the planarization layer having the boss includes first forming a first planarization layer covering the active array, and then forming a second planarization layer over the first planarization layer corresponding to the pixel area to form the boss.

In an implementation of the present disclosure, forming the planarization layer having the boss includes forming a planarization layer covering the active array, and then removing a portion of the planarization layer corresponding to a non-pixel area to form the boss.

In an implementation of the present disclosure, color films between adjacent sub-pixels in respective pixels overlap with each other.

In an implementation of the present disclosure, the manufacturing method further includes packaging the back plate and the cover plate, after packaging the OLED device and the auxiliary cathode are offset from each other.

A third aspect of the present disclosure provides a display device including the display panel described above.

In the display panel of the present disclosure, the OLED device is provided on a boss, it can reduce the distance from the cover plate glass, and can effectively improve the brightness of the panel.

