Petrochina Company Limited

Boe Technology Group Co., Ltd.

Beijing Boe Display Technology Co., Ltd.

Chunming Cui

Jianjun Yi

Huashu Li

Jianying Zhang

Baozuo Yin

Liang Cui

Zhifei Li

Li Wang

Tao Li

Liang Wang

Ying Zhao

Huili Wu

Shipei Li

Weimeng Zhang

Qingping Yin

Jie Jin

Xiaomei Lang

Linmei Wu

Zihao Zhao

Weihuan Huang

The disclosure relates to a display device including: an organic light-emitting diode display panel, a fingerprint recognition layer located below the organic light-emitting diode display panel, and a light filtering layer located between the organic light-emitting diode display panel and the fingerprint recognition layer, where the light filtering layer is configured to filter out light rays with an incidence angle greater than a filter angle among light rays carrying fingerprint line information, and to transmit light rays with an incidence angle smaller than or equal to the filter angle, where the incidence angle is the angle between the light rays carrying fingerprint line information, and the direction perpendicular to the fingerprint recognition layer.

Display device

An olefin polymerization catalyst and preparation method and use thereof are provided. The components of the catalyst comprise an active magnesium halide, a titanium compound containing at least one Ti-halide bond loaded on the active magnesium halide, and an internal electron donor selected from one or more silicon esters compounds having formula (I). The method for preparing the catalyst components is that: adding spherical magnesium chloride alcoholate particles and the electron donor into the solution of titanium compound in sequence, and processing with the titanium compound for one or more times to obtain the catalyst. The catalyst system used for the olefin polymerization comprises the catalyst components, a cocatalyst and an external electron donor. The catalyst has high activity for the propylene polymerization, and the activity is 4399 gPP/gTi&#xb7;h(50&#xb0; C., 1 h, slurry polymerization at atmospheric pressure), and the isotacticity of the polymer is 98%. 

Olefin polymerization catalyst and preparation method and use thereof

A catalyst for homopolymerizing and copolymerizing propylene and its preparation and use. The catalyst component includes titanium compound containing at least one Ti-halogen bond and at least two kinds of electron donor compounds A and B supported on MgCl.nROH adduct, wherein the electron donor compound A is a compound of formula (I), the electron donor compound B is ester or ether compound; the molar ratio between compound A and compound B is 0.1-5; the molar ratio between the total amounts of the two kinds of electron donors and MgCl.nROH is 0.01-1, based on the amount of MgCl.nROH; and the molar ration between the titanium compound containing Ti-halogen bond and MgCl.nROH is 1-200. The catalyst has high activity, high stereospecificity and good copolymerization performance. In addition, the morphology of the polymer obtained therefrom is good. 

Catalyst for homopolymerizing and copolymerizing propylene and its preparation and use

An olefin polymerization catalyst and preparation method and use thereof are provided. The catalyst component comprises (1) an active magnesium halide, (2) a titanium compound containing at least one Ti-halide bond supported thereon, and (3) an electron donor selected from the group consisting of one or more sulfonyl-containing compounds having the following formula. There are two methods for preparing such solid catalyst component: I) treating the active magnesium halide (1) particles with alkylaluminum, subsequently adding the electron donor (3), treating it with the solution of titanium compound (2) one or more times; II) adding spherical magnesium chloride alcoholate particles to the solution of titanium compound (2), subsequently adding the electron donor (3), treating it with the solution of titanium compound (2) one or more times. The catalyst system comprises such solid catalyst component, a co-catalyst (alkylaluminum compound) and an external electron donor. 

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Chunming Cui