TECHNICAL FIELD

The present disclosure relates to a display apparatus.

BACKGROUND ART

Display apparatuses are a type of output devices for displaying obtained or stored electrical information by converting the electrical information to visual information, and are used in various fields such as homes or work places.

There are many different display apparatuses such as monitor devices connected to personal computers (PCs) or server computers, portable computer systems, Global Positioning System (GPS) terminals, general television sets, Internet protocol televisions (IPTVs), portable terminals, e.g., smart phones, tablet PCs, personal digital assistants (PDAs), and cellular phones, any other display apparatus for reproducing images like advertisements or films, or other various kinds of audio/video systems.

The display apparatus may use many different display means to display still images or moving images for the user. The display means may include cathode-ray tubes (CRTs), Light Emitting Diodes (LEDs), Organic LEDs (OLEDs), Active-Matrix OLEDs, liquid crystals or electronic paper.

DISCLOSURE

Therefore, it is an aspect of the disclosure to provide a backlight unit with improved wrinkled phenomenon of optical sheet due to external factors such as temperature or humidity, and a display apparatus including the same.

In accordance with one aspect of the disclosure, a display apparatus includes: a backlight unit comprising an optical sheet; and an image forming unit configured to generate an image by transmitting or blocking light emitted from the backlight unit, and the optical sheet includes a plurality of sheets, and includes a shape memory material on at least one of the plurality of sheets.

The optical sheet may include a shape memory alloy or a shape memory polymer in at least one of the plurality of sheets.

The shape memory alloy may include Nitinol.

The shape memory material may be provided on the entire surface of the at least one sheet.

The shape memory material may be provided on an outer part of the surface of the at least one sheet.

The shape memory material may be provided on upper part and lower part of the surfaces of the at least one sheet.

The shape memory material may be provided on the right side part and the left side part of the surface of the at least one sheet.

In accordance with another aspect of the disclosure, a backlight unit includes: a light source; and an optical sheet provided so that the light emitted from the light source is incident, and the optical sheet includes a plurality of sheets, and comprises a shape memory material on at least one of the plurality of sheets.

The optical sheet may include at least one of a diffuser sheet, a prism sheet, a protective sheet, and a brightness enhancement sheet.

The optical sheet may include a shape memory alloy or a shape memory polymer in at least one of the plurality of sheets.

The shape memory alloy may include Nitinol.

The shape memory material may be provided on the entire surface of the at least one sheet.

The shape memory material may be provided on an outer part of the surface of the at least one sheet.

The shape memory material may be provided on upper part and lower part of the surfaces of the at least one sheet.

The shape memory material may be provided on the right side part and the left side part of the surface of the at least one sheet.

According to an aspect of the present disclosure, the wrinkled phenomenon of the optical sheet may be reduced by using a shape memory material for an optical sheet.

