Display screen and electronic device using same

A display screen includes a substrate comprising a first surface and a second surface opposite to the first surface; a beam-splitting polarizer formed on a first surface of the substrate; and a non-conductive metal layer formed on a second surface of the substrate. The beam-splitting polarizer is a cholesterol liquid crystalline polarization layer.

BACKGROUND

1. Technical Field

The exemplary disclosure generally relates to display screens and electronic devices with the display screens.

2. Description of Related Art

A typical mobile electronic device has a display system for displaying digital information, images, or graphs. The display system includes a display element and a display screen. The display screen covers the display element to protect the display element from damage. The display screen is usually made of a transparent material, such as resin or glass. When the display element is actuated, users can view the light that is transmitted through the display screen. To improve the appearance of the display screen, a metal layer is typically formed on the display screen. However, typical display screens formed with a metal layer have a low transparence, thus the display screens with metallic luster cannot be obtained.

Therefore, there is room for improvement within the art.

DETAILED DESCRIPTION

Referring toFIGS. 1 and 2, in a present embodiment, an electronic device20includes a display screen10and a housing21for receiving and fixing the display screen10. The display screen10is embedded into the housing. Light transmitted from a display unit (not shown) under the display screen10may pass through the display screen10and be viewed by the users.

The display screen10includes a substrate11, a beam-splitting polarizer12formed on a first surface111of the substrate11. A paint layer13formed on a second surface112of the substrate11opposite to the first surface111, a non-conductive metal layer15formed on the paint layer13, and a protection layer17formed on the non-conductive metal layer15.

The substrate11may be molded from a transparent thermoplastic material, such as Polycarbonate (PC), Polymethyl Methacrylate (PMMA), Polyamide (PA), or any combination thereof. The substrate11further may be made of glass or ceramic.

The beam-splitting polarizer12is a cholesterol liquid crystalline polarization layer. The beam-splitting polarizer12may be formed by sputtering cholesterol liquid crystalline polymer, and has a thickness between 10 micrometers and 90 micrometers. The beam-splitting polarizer12can improve a light transmission rate of the display screen10between 10% and 70%. The beam-splitting polarizer12can transmit a light having a wavelength between 400 nanometers and 750 nanometers.

The paint layer13may be formed by acrylic resin paint. The paint layer13can enhance the binding force between the non-conductive metal layer15and the substrate11. The paint layer13has a thickness between 5 micrometers and 20 micrometers.

The non-conductive metal layer15may be formed by vacuum sputtering process. The non-conductive metal layer15is insulative thereby not affecting the electronic device transmitting/receiving radio frequency. When the display unit under the display screen10is off, the non-conductive metal layer15has a reflectivity of 30%-50%, which causes the display screen10to have a metallic luster appearance. When the display unit under the display screen10is on, the non-conductive metal layer15has a transmittance of 50%-70%. The non-conductive metal layer15includes alternating niobium oxide layers152and aluminum oxide layers154. The total number of the niobium oxide layers152and aluminum oxide layers154may be 5 or 7. The non-conductive metal layer15contacts with the paint layer13may via one niobium oxide layer152. The non-conductive metal layer15contacts with the protection layer may also via one niobium oxide layer152.

The protection layer17is transparent and has a thickness between 10 micrometers and 30 micrometers. In an exemplary embodiment, the protection layer17is formed by acrylic resin paint. In another exemplary embodiment, the protection layer17may be formed by acrylic resin paint with pigment to decorate the display screen10.

Referring toFIG. 3, another exemplary embodiment of a display screen is illustrated. The display screen20includes a substrate21, a beam-splitting polarizer22formed on a first surface211of the substrate21, a non-conductive metal layer25directly formed on a second surface112of the substrate21opposite to the first surface211, and a protection layer27formed on the non-conductive metal coating25. The non-conductive metal layer25includes alternating niobium oxide layers252and aluminum oxide layers254.