US-12625305-B2 - Display device

Abstract

A display device includes a display unit including a lower substrate and first, second, and third light emitting elements disposed on the lower substrate, a color filter unit including an upper substrate having a lower surface facing the first, second, and third light emitting elements, a filler disposed between the display unit and the color filter unit and including a wavelength conversion particle. The color filter unit further includes a color filter layer including first, second, and third color filters disposed on the lower surface of the upper substrate, a bank layer disposed below the color filter layer and including first, second, and third openings, a first column spacer filling the first opening, and a second column spacer filling the second opening.

Inventors

• Sun-Kyu Joo
• Sangji PARK
• Jae cheol Park
• Keunchan OH
• DoKyung Youn
• Songee LEE
• Woo-Man Ji
• Tae Hyung HWANG

Assignees

• SAMSUNG DISPLAY CO., LTD.

Dates

Publication Date

20260512

Application Date

20230725

Priority Date

20221031

Claims (20)

1. 1 . A display device comprising: a display unit including a lower substrate and a first light emitting element, a second light emitting element, and a third light emitting element disposed on the lower substrate; a color filter unit including an upper substrate having a lower surface facing the first, second, and third light emitting elements; and a filler disposed between the display unit and the color filter unit and including a wavelength conversion particle, wherein the color filter unit further includes: a color filter layer including a first color filter, a second color filter, and a third color filter disposed on the lower surface of the upper substrate; a bank layer disposed below the color filter layer and including a first opening, a second opening, and a third opening; a first column spacer filling the first opening; and a second column spacer filling the second opening.
2. 2 . The display device of claim 1 , wherein the wavelength conversion particle includes quantum dots emitting first color light.
3. 3 . The display device of claim 2 , wherein the first color light is red light.
4. 4 . The display device of claim 1 , wherein the filler fills the third opening.
5. 5 . The display device of claim 1 , wherein a lower surface of the first column spacer and a lower surface of the second column spacer are formed lower than a lower surface of the bank layer.
6. 6 . The display device of claim 5 , wherein the first column spacer and the second column spacer are connected to each other.
7. 7 . The display device of claim 1 , wherein the first color filter and the second color filter include a scattering element.
8. 8 . The display device of claim 1 , further comprising: a low refractive layer disposed between the color filter layer and the bank layer, the first column spacer, the second column spacer, and the filler.
9. 9 . The display device of claim 8 , further comprising: a first capping layer disposed between the low refractive layer and the bank layer, the first column spacer, the second column spacer, and the filler.
10. 10 . The display device of claim 9 , further comprising: a second capping layer covering a lower surface of the bank layer and sidewalls of the first opening, the second opening, and the third opening.
11. 11 . The display device of claim 1 , wherein each of the first column spacer and the second column spacer includes a liquid repellent component.
12. 12 . A display device comprising: a display unit including a lower substrate and a first light emitting element, a second light emitting element, and a third light emitting element disposed on the lower substrate; a color filter unit including an upper substrate having a lower surface facing the first, second, and third light emitting elements; and a filler disposed between the display unit and the color filter unit and including a wavelength conversion particle, wherein the display unit further includes: a bank layer disposed on the first, second, and third light emitting elements and including a first opening, a second opening, and a third opening; a first column spacer filling the first opening; and a second column spacer filling the second opening, and the color filter unit further includes a color filter layer including a first color filter, a second color filter, and a third color filter disposed on the lower surface of the upper substrate.
13. 13 . The display device of claim 12 , wherein the wavelength conversion particle includes quantum dots emitting first color light.
14. 14 . The display device of claim 13 , wherein the first color light is red light.
15. 15 . The display device of claim 12 , wherein the filler fills the third opening.
16. 16 . The display device of claim 12 , wherein an upper surface of the first column spacer and an upper surface of the second column spacer are formed higher than an upper surface of the bank layer.
17. 17 . The display device of claim 16 , wherein the first column spacer and the second column spacer are connected to each other.
18. 18 . The display device of claim 12 , further comprising: an encapsulation layer disposed between the bank layer and the first to third light emitting elements, the first column spacer, the second column spacer, and the filler.
19. 19 . The display device of claim 18 , further comprising: a first capping layer disposed between the encapsulation layer and the bank layer, the first column spacer, the second column spacer, and the filler.
20. 20 . The display device of claim 19 , further comprising: a second capping layer covering an upper surface of the bank layer and sidewalls of the first opening, the second opening, and the third opening.

Description

CROSS-REFERENCE TO RELATED APPLICATION(S) This application claims priority to and benefits of Korean Patent Application No. 10-2022-0142219 under 35 U.S.C. § 119, filed on Oct. 31, 2022, in the Korean Intellectual Property Office (KIPO), the entire contents of which are incorporated herein by reference. BACKGROUND 1. Technical Field Embodiments relate to a display device for providing visual information. 2. Description of the Related Art The display device is a device that displays an image for providing visual information to a user. Representative examples of such a display device include a liquid crystal display device and an organic light emitting display device. Recently, in order to improve display quality, a display device including a display substrate including multiple pixels and a color conversion substrate including a color filter layer and a color conversion layer has been proposed. The color conversion layer may convert a wavelength of light provided from the display substrate. Accordingly, the display device including the color conversion layer may emit light having a color different from that of incident light. For example, the color conversion layer may include wavelength conversion particles such as quantum dots. SUMMARY Embodiments provide a display device with improved reliability. A display device according to an embodiment may include a display unit including a lower substrate and a first light emitting element, a second light emitting element, and a third light emitting element disposed on the lower substrate, a color filter unit including an upper substrate having a lower surface facing the first, second, and third light emitting elements, and a filler disposed between the display unit and the color filter unit and including a wavelength conversion particle. The color filter unit may include a color filter layer including a first color filter, a second color filter, and a third color filter disposed on the lower surface of the upper substrate, a bank layer disposed below the color filter layer and including a first opening, a second opening, and a third opening, a first column spacer filling the first opening, and a second column spacer filling the second opening. In an embodiment, the wavelength conversion particle may include quantum dots emitting first color light. In an embodiment, the first color light may be red light. In an embodiment, the filler may fill the third opening. In an embodiment, a lower surface of the first column spacer and a lower surface of the second column spacer may be formed lower than a lower surface of the bank layer. In an embodiment, the first column spacer and the second column spacer may be connected to each other. In an embodiment, the first color filter and the second color filter may include a scattering element. In an embodiment, the display device may further include a low refractive layer disposed between the color filter layer and the bank layer, the first column spacer, the second column spacer, and the filler. In an embodiment, the display device may further include a first capping layer disposed between the low refractive layer and the bank layer, the first column spacer, the second column spacer, and the filler. In an embodiment, the display device may further include a second capping layer covering a lower surface of the bank layer and sidewalls of the first opening, the second opening, and the third opening. In an embodiment, each of the first column spacer and the second column spacer may include a liquid repellent component. A display device according to an embodiment may include a display unit including a lower substrate and a first light emitting element, a second light emitting element, and a third light emitting element disposed on the lower substrate, a color filter unit including an upper substrate having a lower surface facing the first, second, and third light emitting elements, and a filler disposed between the display unit and the color filter unit and including a wavelength conversion particle. The display unit may further include a bank layer disposed on the first, second, and third light emitting elements and including a first opening, a second opening, and a third opening, a first column spacer filling the first opening, and a second column spacer filling the second opening. The color filter unit may further include a color filter layer including a first color filter, a second color filter, and a third color filter disposed on the lower surface of the upper substrate. In an embodiment, the wavelength conversion particle may include quantum dots emitting first color light. In an embodiment, the first color light may be red light. In an embodiment, the filler may fill the third opening. In an embodiment, an upper surface of the first column spacer and an upper surface of the second column spacer may be formed higher than an upper surface of the bank layer. In an embodiment, the first column spacer and the second column spacer