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KR-20260063042-A - LED PACKAGE FOR WIDE COLOR GAMET, DISPLALY PANNEL INCLUDING IT

KR20260063042AKR 20260063042 AKR20260063042 AKR 20260063042AKR-20260063042-A

Abstract

The present invention relates to an LED package for high color reproduction, and more specifically, provides an LED package for high color reproduction of a display device, comprising a phosphor composition including a red phosphor and a light-emitting element including blue light and green light, thereby enabling high color reproduction. The wavelength band of the green light of the present invention for solving the above technical problem may be in the range of 530 to 550 nm.

Inventors

  • 이상선

Assignees

  • 이상선

Dates

Publication Date
20260507
Application Date
20241030

Claims (7)

  1. As an LED package for high color reproduction of a display device, Phosphor composition part including a red phosphor; and An LED package including a light-emitting element including blue light and green light.
  2. In paragraph 1, An LED package in which the wavelength band of the blue light is in the range of 430 to 450 nm.
  3. In paragraph 1, An LED package in which the wavelength band of the above green light is in the range of 530 to 550 nm.
  4. In paragraph 1, The above light-emitting element is an LED package comprising a blue emission layer and a green emission layer between a P-type GaN layer and an N-type GaN layer.
  5. In Paragraph 4, An LED package comprising an interference reduction layer between the blue emission layer and the green emission layer.
  6. In paragraph 1, An LED package having a wavelength band of the above red phosphor in the range of 610 to 650 nm and a full width at half maximum of 50 nm or less.
  7. A display panel comprising an LED package according to any one of claims 1 to 6.

Description

LED package for wide color reproduction, display panel including the same The present invention relates to an LED package for high color reproduction, and more specifically, provides an LED package for high color reproduction of a display device, comprising a phosphor composition including a red phosphor and a light-emitting element including blue light and green light, thereby enabling high color reproduction. Backlight units of flat-panel displays, such as LCD TVs, primarily use LED light sources as the light source for the backlight unit. A typical LED package includes a cavity for mounting a light-emitting element, leads for connecting the light-emitting element to an external electrical circuit, bonding wires for electrical connection between the light-emitting element and the leads, and a molding portion that protects the LED chip by being molded within the cavity using a transparent resin material such as epoxy or silicone. Semiconductor devices containing compounds such as GaN and AlGaN have wide and easy-to-tunable band gap energies, so they are used in various ways, such as light-emitting diodes and various other diodes. In particular, light-emitting diodes (LEDs) using group 3-5 or group 2-6 compound semiconductor materials can realize various colors such as red, green, blue, and ultraviolet light through the development of thin-film growth technology and device materials, and can also realize high-efficiency white light by using fluorescent materials or combining colors, and have the advantages of low power consumption, semi-permanent lifespan, fast response speed, safety, and environmental friendliness compared to conventional light sources such as fluorescent lamps and incandescent lamps. Methods for realizing white light using such light-emitting devices include using a single chip and using a multi-chip. More specifically, when white light is implemented with a single chip, there is a method of obtaining white light by using light emitted from a blue LED to excite at least one phosphor, and a method of combining a phosphor on a blue or ultraviolet (UV) light-emitting diode chip, and when white light is implemented with a multi-chip, there is a method of obtaining white light by combining three types of chips of RGB (Red, Green, Blue). Currently, the display market is seeing growth in the OLED sector due to its high color quality and color reproduction rate. To meet this growing demand, technical alternatives to LED light sources are facing the technical requirement to significantly improve color reproduction rates compared to existing technologies. Efforts to overcome the color reproduction rate of LCD display devices have continued since the 2020s by incorporating inks and materials utilizing additional quantum dot materials into light guide plates, prism sheets, and diffusion sheets, but this has led to an increase in the price of LCD TVs and caused complexity in the structure of LCD TVs. In addition, to overcome these issues, some quantum dot LED packages have been developed by incorporating quantum dot materials into LED packages; however, they have not yet been commercialized because they have failed to overcome the reliability issues under high temperature and high humidity conditions, which are limitations of quantum dot materials. Under these circumstances, currently commercialized white light LED packages are formed and used with a structure consisting of a combination of a 'blue light emitting element (compound semiconductor) + green light phosphor + red light phosphor,' but they have the limitations described below. To improve the color reproduction rate of LED light sources, the color realization range of the white light source of the LED must be enhanced, and currently, LED packages formed by mixing green light phosphors and red light phosphors on a blue light chip are being used. Figure 1 is a diagram showing the color reproduction range of a conventional LED package. Figure 1 is a Yxy color coordinate, where the black line represents the defined color space of CIE1931, the red line represents the NTSC color reproduction range, and the blue line represents the color reproduction range of a conventional LED package. Conventional LED packages produce white light using a combination of a green phosphor and a red phosphor in a blue light-emitting element, but the color reproduction rate (NTSC) of the white light source produced in this way is about 90%, which is very low compared to OLED. Referring to Fig. 1, it can be seen that in order to improve the color reproduction rate in a conventional LED package, the emission wavelength of the green phosphor must be shifted to a wider area, as indicated by the arrow in Fig. 1, that is, from a wavelength of 550 nm to around 530 to 545 nm, in order to satisfy a more improved color reproduction range. However, conventional green phosphors do not shift their emission wavelength toward a wider range as shown in Fig. 1, making it difficult to i