BACKGROUND

Technical Field

The present disclosure relates to a light emitting diode display device and a multi-screen display device using the same.

Description of the Related Art

Display devices are being widely used as a display screen of notebook computers, tablet computers, smartphones, portable display devices, and portable information devices in addition to a display screen of television (TVs) and monitors.

LCD devices and organic light emitting display devices display an image by using thin film transistors (TFTs) as switching elements. Since the LCD devices cannot self-emit light, the LCD devices display an image by using light emitted from a backlight unit which is disposed under a liquid crystal display panel. Since the LCD devices include a backlight unit, a design of the LCD devices is limited, and luminance and a response time are reduced. Since the organic light emitting display devices include an organic material, the organic light emitting display devices are vulnerable to water, causing a reduction in reliability and lifetime.

Recently, research and development on light emitting diode display devices including a micro light emitting device are being done. The light emitting diode display devices have high image quality and high reliability, and thus, are attracting much attention as next-generation display devices.

A related art light emitting diode display device is manufactured by transferring a micro light emitting device onto a thin film transistor (TFT) array substrate, and due to a transfer process time taken in a transfer process for the micro light emitting device, current transfer technology is more advantageous to display devices having a relatively large size than panels having a relatively small size.

However, in the related art light emitting diode display device, a pad part for applying signals is provided in an edge of the TFT array substrate, and due to an instrument for covering the pad part, a bezel area increases.

Moreover, in a case where the related art light emitting diode display device is manufactured to have a large size, the number of pixels increases, and for this reason, a transfer error rate of a micro light emitting device increases, causing a reduction in productivity. In order to solve such a problem, research and development are being recently done on multi-screen devices which realize a large-size screen and are implemented by connecting two or more light emitting diode display devices having a relatively small size. However, in the multi-screen devices, due to a bezel area of each of the two or more light emitting diode display devices, a seam (or a boundary portion) exists between display devices coupled to each other. When displaying one image on a whole screen, the boundary portion causes a sense of discontinuity of the whole screen, causing a reduction in degree of viewing immersion of a user.

BRIEF SUMMARY

Accordingly, the present disclosure is directed to provide a light emitting diode display device and a multi-screen display device using the same that substantially obviate one or more problems due to limitations and disadvantages of the related art.

An aspect of the present disclosure is directed to provide a light emitting diode display device and a multi-screen display device using the same, which include a reduced or minimized bezel area.

Another aspect of the present disclosure is directed to provide a multi-screen display device in which a boundary portion between adjacent display devices is reduced or minimized.

Additional advantages and features of the disclosure will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the disclosure. The objectives and other advantages of the disclosure may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

To achieve these and other advantages and in accordance with the purpose of the disclosure, as embodied and broadly described herein, there is provided a light emitting diode display device including a substrate including a first display area and a second display area surrounding the first display area, a plurality of first unit pixels provided in the first display area and each including a plurality of subpixels each including a micro light emitting device, and a plurality of second unit pixels provided in the second display area overlapping an edge of the substrate and each including a plurality of subpixels and having a size less than a size of each of the plurality of first unit pixels.

The plurality of first unit pixels may be arranged at a reference pixel pitch, and a distance between a center portion of each of the plurality of second unit pixels and an outer surface of the substrate may be half or less of the reference pixel pitch.

In another aspect of the present disclosure, there is provided a multi-screen display device including a plurality of screen modules each including a light emitting diode display device and a plurality of module coupling members coupling side surfaces of the plurality of screen modules, wherein the light emitting diode display device including a substrate including a first display area and a second display area surrounding the first display area, a plurality of first unit pixels provided in the first display area and each including a plurality of subpixels each including a micro light emitting device, and a plurality of second unit pixels provided in the second display area overlapping an edge of the substrate and each including a plurality of subpixels and having a size less than a size of each of the plurality of first unit pixels.

A maximum distance between second unit pixels of two screen modules which are adjacent to each other with one of the plurality of module coupling members therebetween may be equal to or less than a reference pixel pitch of a first unit pixel, and the reference pixel pitch may be a distance between center portions of two adjacent first unit pixels.

It is to be understood that both the foregoing general description and the following detailed description of the present disclosure are exemplary and explanatory and are intended to provide further explanation of the disclosure as claimed.

