CROSS-REFERENCE TO RELATED APPLICATION(S)

This application is based on and claims priority under 35 U.S.C. § 119 to Korean Patent Application No. 10-2019-0149894, filed on Nov. 20, 2019, in the Korean Intellectual Property Office, the disclosure of which is incorporated by reference herein in its entirety.

BACKGROUND

1. Field

The disclosure relates to a display apparatus, and more particularly, to a display apparatus capable of performing local dimming.

2. Description of Related Art

A display apparatus that displays an image is an apparatus that uses a display panel to display the image and is used in various devices such as televisions (TVs), computer monitors, smartphones, etc. However, a general display apparatus needs a backlight unit including a separate light source because it is not capable of self-emitting light, and the display panel locates the backlight unit at the rear of a liquid crystal display (LCD).

The backlight unit is a dimming device that irradiates light uniformly over the entire display panel, and a display panel including a general backlight unit uses a light-emitting diode (LED) of a certain color as a light source.

Meanwhile, the backlight unit includes a light guide plate that diffuses light, thus uniformly emitting light. However, there is a limitation in achieving local dimming that differentiates a brightness according to a position.

SUMMARY

Embodiments of the disclosure provide a display apparatus capable of performing local dimming to improve a contrast ratio.

Additional aspects will be set forth in part in the description which follows and, in part, will be apparent from the description, or may be learned by practice of the presented embodiments of the disclosure.

In accordance with an aspect of the disclosure, a display apparatus includes a light source array in which a plurality of light sources emitting light in a local dimming manner are arranged, a color conversion layer including color conversion particles that convert the light into light of a certain color and emitting white light by using the light, a display panel configured to generate an image by using the white light, and a selective transmission member arranged between the light source array and the color conversion layer and transmitting the light to the color conversion layer and avoiding transmitting the light converted in the color conversion layer to the light source array.

The selective transmission member may totally reflect the converted light incident thereon.

The selective transmission member may include a transmissivity and a reflectivity that change with an incidence angle of the light.

Out of the light, light incident on the selective transmission member at an incidence angle equal to or greater than a certain angle may include a reflectivity that is greater than a transmissivity thereof with respect to the selective transmission member.

The certain angle may be determined based on a size of the local dimming and a distance between the light source array and the selective transmission member.

A transmissivity of a first region corresponding to a light source, which emits the light, of the selective transmission member may be greater than a transmissivity of a second region not corresponding to the light source, which emits the light, of the selective transmission member.

The first region may include a region overlapping with the light source that emits the light.

The transmissivity of light of the second region may be less than or equal to 30% of the transmissivity of light of the second region.

The selective transmission member may include a combination of a plurality of material layers having different refractive indices.

The color conversion particles may include quantum dost (QDs).

The display apparatus may further include a plurality of barriers arranged spaced in parallel in a direction in which the plurality of light sources are arranged in the color conversion layer.

The plurality of barriers may be arranged in a region of the color conversion layer, which does not overlap with the plurality of light sources.

At least one of the plurality of barriers may include a reflective material.

The color conversion layer may further include a first color conversion layer including first color conversion particles that convert blue light into green light and a second color conversion layer including second color conversion particles that convert the blue light into red light.

The display apparatus may further include another selective transmission member arranged between the first color conversion layer and the second color conversion layer, and transmitting the blue light and the green light and reflecting the red light.

The display apparatus may further include an electro-optic layer capable of adjusting a transmissivity of the light with respect to the selective transmission member based on optical characteristics thereof that change with an applied electric signal and an electrode part applying the electric signal to the electro-optic layer.

The electrode part may include a plurality of electrode pairs arranged corresponding to each of the plurality of light sources with the electro-optic layer therebetween.

The electro-optic layer may include at least one of liquid crystal or electro-wetting material having optical characteristics that change with an applied electric signal.

The display apparatus may further include an image enlargement member configured to enlarge the image generated in the display panel and an image convergence member configured to converge the enlarged image and an image corresponding to an external environment into a certain space.

The image convergence member may include at least one of a beam splitter, a transflective film, a fold mirror, or an anisotropic mirror.

