DE-102024135192-A1 - COLOR CONVERSION ELEMENT FOR LEDS

DE102024135192A1DE 102024135192 A1DE102024135192 A1DE 102024135192A1DE-102024135192-A1

Abstract

The color conversion element for LEDs according to one embodiment of the present invention comprises: a color conversion section formed in a plate shape, which converts and transmits the color of light emitted by the LED; a light reflection section formed to cover the side of the color conversion section and to reflect light traveling toward that side; and a light absorption section formed around the outer edge of the light reflection section to cover it and to absorb light traveling through the light reflection section. The color conversion section, the light reflection section, and the light absorption section are integrally formed in a plate shape with a flat, light-emitting surface. The light reflection section reflects light traveling toward the side of the color conversion section, and the light absorption section eliminates light traveling laterally, thereby improving the rectilinearity of the emitted light.

Inventors

Sung Yoon Lee
Taek Gi Lim
Soon Min KIM
Jong Woo Ha

Assignees

ROOTS CO., LTD.

Dates

Publication Date: 20260513
Application Date: 20241128
Priority Date: 20241112

Claims (6)

Color conversion element for LEDs, comprising: a color conversion section formed as a flat plate configured to change the color of light emitted by the LED as it passes through it; a light reflection section formed to cover the sides of the color conversion section and configured to reflect light traveling to the sides of the color conversion section; a light absorption section formed around the outer edge of the light reflection section configured to absorb light traveling through the light reflection section, where the color conversion section, the light reflection section, and the light absorption section are formed integrally as a flat plate with a light-emitting surface, and the light reflection section reflects light traveling to the sides of the color conversion section, while the light absorption section removes laterally directed light, thereby improving the rectilinearity of the emitted light.
Color conversion element for LEDs according to Claim 1 , wherein: the side surface of the color conversion section is formed on an incline; the light reflection section has a layered shape and is formed to cover the inclined side surface of the color conversion section; the light absorption section is formed in a rectangular frame shape with an inclined inner side surface and an outer side surface parallel to the direction of light propagation; wherein the entire structure is formed in the form of a rectangular flat plate shape.
Color conversion element for LEDs according to Claim 1 , wherein: the side surface of the color conversion section is inclined to a certain depth, the remaining section being formed parallel to the direction of light propagation; the light reflection section has a layered shape and covers the side surface of the color conversion section, with some sections being inclined in the direction of light propagation and other sections being parallel, similar to the color conversion section; the light absorption section is formed in a rectangular frame shape, with part of the inner side surface inclined and the remainder being formed parallel to the direction of light propagation, and the outer side surface being formed parallel to the direction of light propagation; wherein the entire structure is formed in the form of a rectangular flat plate shape.
Color conversion element for LEDs according to Claim 1 , wherein: the light reflection section is made of a material selected from the group consisting of aluminium, silver, gold, copper, chromium, titanium dioxide and cerium oxide, and is applied to the color conversion section in the form of a layer by a deposition process.
Color conversion element for LEDs according to Claim 1 , wherein: the light absorption section is a mixture of glass and carbon powder formed by mixing liquid glass and carbon powder and hardening the mixture.
Color conversion element for LEDs according to Claim 1 , wherein: the light absorption section is chromium oxide or a nickel-chromium alloy and is coated on the outside of the light reflection section by a deposition process.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority over and the benefits of Korean patent application no. 2024-0160121 , filed on November 12, 2024, the disclosure of which is contained herein in full by reference. STATE OF THE ART 1. Field of the invention The present disclosure relates to a color conversion element for an LED. More specifically, the present disclosure relates to a color conversion element for an LED that is installed in front of an LED chip and changes the wavelength of light emitted by the LED. 2. Discussion of the state of the art Applications where multiple small LEDs are arranged and controlled to switch on and off independently, such as multi-beam LEDs for car headlights, have become more widespread. Since each small LED illuminates independently, it is important to improve the directness and light quality of each individual LED. The Japanese patent no. 7117127 Disclosing a light-emitting device, comprising a substrate, a light-emitting element implemented on the substrate, and a wavelength conversion element (17) arranged on the light-emitting element, wherein a lower surface covers the entire upper surface of the light-emitting element and an upper surface is smaller than the lower surface. The wavelength conversion element has side surfaces whose width decreases from bottom to top. Additionally, a first cover element (19) covers the side surface of the wavelength conversion element, while a second cover element (21) covers the entire side surface of the light-emitting element and extends from the perimeter of the lower surface of the wavelength conversion element to the upper surface. The first and second cover elements have different light absorption rates, with the first cover element filling the space between the second cover element and the wavelength conversion element. The inner surface of the second cover element extends vertically from the perimeter of the lower surface of the wavelength conversion element towards the upper surface, thus providing a light-emitting device with improved optical performance. SUMMARY OF THE INVENTION The present disclosure is aimed at providing a color conversion element for LEDs with high light linearity, a smooth surface and a compact size without cracks or chipping, thereby improving the light quality of LEDs. The color conversion element for LEDs according to one embodiment of the present invention comprises: a color conversion section formed in a plate shape, which converts and transmits the color of light emitted by the LED; a light reflection section formed to cover the side of the color conversion section and to reflect light traveling toward that side; and a light absorption section formed around the outer edge of the light reflection section to cover it and to absorb light traveling through the light reflection section. The color conversion section, the light reflection section, and the light absorption section are integrally formed in a plate shape with a flat, light-emitting surface. The light reflection section reflects light traveling toward the side of the color conversion section, and the light absorption section eliminates light traveling laterally, thereby improving the rectilinearity of the emitted light. The side of the color conversion section is formed with an inclined surface, a light reflection section is shaped as a layer to cover the inclined side of the color conversion section, and the light absorption section is formed in a rectangular frame shape, its inner surface being inclined and its outer surface parallel to the direction of light. Thus, the overall structure can have a rectangular, flat plate shape. The side of the color conversion section is inclined to a certain depth, while the remaining section is parallel to the direction of light propagation. The light reflection section is plate-shaped and covers the side of the color conversion section; similarly, part of it is inclined to the direction of light propagation, while another part is parallel. The light absorption section is formed in a rectangular frame shape, with part of the inner surface inclined and the remaining part oriented parallel to the direction of light propagation, while the outer surface is parallel to the direction of light propagation, allowing the The entire structure takes on a rectangular, flat, plate shape. The light reflection section can be made of a material selected from aluminium, silver, gold, copper, chromium, titanium dioxide or cerium oxide, and it can be attached to the color conversion section by a deposition process, forming a thin layer. The light absorption section can be a mixture of glass and carbon powder, created by mixing liquid glass with carbon powder and subsequent hardening. The light absorption section can be chromium oxide or a nickel-chromium alloy applied to the outside of the light reflection section. BRIEF DESCRIPTION OF THE DRAWINGS The above and other items, features and advantages