Organic light-emitting diode display panel, method for preparing the same, and display device

Abstract

The present disclosure provides an organic light-emitting diode display panel, a method for preparing the same, and a display device. The organic light-emitting diode display panel includes a substrate, a light-emitting structure layer arranged on the substrate, and a light modulation layer arranged on a light exiting path of the light-emitting structure layer and configured to adjust a direction of an emergent light beam.

What is claimed is: 
     
         1 . An organic light-emitting diode (OLED) display panel, comprising a substrate, a light-emitting structure layer arranged on the substrate, and a light modulation layer arranged on a light exiting path of the light-emitting structure layer and configured to adjust a direction of an emergent light beam. 
     
     
         2 . The OLED display panel of  claim 1 , wherein the light modulation layer is configured to totally reflect a part of a front viewing-angle emergent light beam from the light-emitting structure layer to change it into a large viewing-angle emergent light beam, and to refract a part of a large viewing-angle emergent light beam from the light-emitting structure layer to change it into a front viewing-angle emergent light beam, so as to redistribute the front viewing-angle emergent light beam and the large viewing-angle emergent light beam,
 a viewing angle is an angle between a normal direction of a display plane and a line of sight, the front viewing-angle emergent light beam is an emergent light beam having a viewing-angle in the range of 0° to 15°, and the large viewing-angle emergent light beam is an emergent light beam having a viewing-angle greater than 40°.   
     
     
         3 . The OLED display panel of  claim 1 , wherein
 the light modulation layer is located on a side of the light-emitting structure layer away from the substrate.   
     
     
         4 . The OLED display panel of  claim 3 , further comprising:
 a protective layer arranged on a side of the light-emitting structure layer away from the substrate which is also a side of the light modulation layer proximate to the substrate; and   a packaging layer arranged on a side of the light-emitting structure layer away from the substrate.   
     
     
         5 . The OLED display panel of  claim 3 , wherein the light modulation layer comprises a first structural layer and a second structural layer which are stacked, with the first structural layer having a first refractive index, and the second structural layer having a second refractive index less than the first refractive index. 
     
     
         6 . The OLED display panel of  claim 5 , wherein a plurality of strip protrusions is provided on a surface of the first structural layer facing the second structural layer; and a plurality of strip grooves is provided on a surface of the second structural layer facing the first structural layer, with the plurality of strip grooves on the second structural layer being attached to the plurality of strip protrusions on the first structural layer, and with each pair of the plurality of strip protrusions and the plurality of strip grooves having the same shape of trapezoid in a cross section perpendicular to the substrate and parallel to a length direction of the substrate. 
     
     
         7 . The OLED display panel of  claim 5 , wherein a plurality of block protrusions is provided on a surface of the first structural layer facing the second structural layer; and a plurality of block grooves is provided on a surface of the second structural layer facing the first structural layer, with the plurality of block grooves on the second structural layer being attached to the plurality of block protrusions on the first structural layer, and with each pair of the plurality of block protrusions and the plurality of block grooves having the same shape of trapezoid in a cross section perpendicular to the substrate and parallel to a length direction of the substrate. 
     
     
         8 . The OLED display panel of  claim 6 , wherein an angle θ between a lateral side and a lower side of the trapezoid is greater than or equal to 55° and less than or equal to 90°. 
     
     
         9 . The OLED display panel of  claim 6 , wherein a height of the trapezoid is equal to a thickness of the first structural layer or the second structural layer, and a pitch between the plurality of strip protrusions is zero. 
     
     
         10 . The OLED display panel of  claim 6 , wherein a lateral side of the trapezoid is linear, curved or arcuate. 
     
     
         11 . The OLED display panel of  claim 7 , wherein an angle θ between a lateral side and a lower side of the trapezoid is greater than or equal to 55° and less than or equal to 90°. 
     
     
         12 . The OLED display panel of  claim 7 , wherein a height of the trapezoid is equal to a thickness of the first structural layer or the second structural layer, and a pitch between the plurality of block protrusions is zero. 
     
     
         13 . The OLED display panel of  claim 7 , wherein a lateral side of the trapezoid is linear, curved or arcuate. 
     
     
         14 . The OLED display panel of  claim 5 , wherein a material of the first structural layer comprises at least one of zirconium oxide and titanium oxide, with the first refractive index being greater than or equal to 1.8; and a material of the second structural layer comprises at least one of silicon oxide, silicon nitride and fluoropolymer, with the second refractive index being less than or equal to 1.5. 
     
     
         15 . The OLED display panel of  claim 1 , wherein the light-emitting structure layer comprises a first light-emitting unit, a second light-emitting unit, and a third light-emitting unit periodically arranged on the substrate. 
     
     
         16 . A display device comprising the OLED display panel of  claim 1 . 
     
     
         17 . A method for preparing an OLED display panel, comprising:
 forming a light-emitting structure layer on the substrate; and   forming a light modulation layer on a light exiting path of the light-emitting structure layer, with the light modulation layer being configured to adjust a direction of an emergent light beam.   
     
     
         18 . The method of  claim 17 , wherein the light modulation layer is formed on a side of the light-emitting structure layer away from the substrate, and the method further comprises:
 forming a protective layer on a side of the light-emitting structure layer away from the substrate which is also a side of the light modulation layer proximate to the substrate; and   forming a packaging layer on a side of the light-emitting structure layer away from the substrate.   
     
     
         19 . The method of  claim 17 , wherein the forming the light modulation layer comprises:
 depositing a first structural thin film, and forming a first structural layer having a plurality of strip protrusions or block protrusions on a surface thereof by a patterning process; and   depositing or coating a second structural thin film on the first structural layer, to form a second structural layer filling a recessed space between the plurality of strip protrusions or a recessed space between the plurality of block protrusions.   
     
     
         20 . The method of  claim 17 , wherein a material of the first structural layer comprises at least one of zirconium oxide and titanium oxide, and has a first refractive index greater than or equal to 1.8; and a material of the second structural layer comprises at least one of silicon oxide, silicon nitride and fluoropolymer, and has a second refractive index less than or equal to 1.5.