CN-122003052-A - Light-emitting display device

Abstract

Disclosed is a light emitting display device including a substrate including red, green, and blue sub-pixels each having a light emitting portion and a non-light emitting portion, a bank at the non-light emitting portion of the red, green, and blue sub-pixels, a light emitting element at each of the red, green, and blue sub-pixels, an encapsulation layer covering the light emitting element, a color filter on the encapsulation layer and overlapping the light emitting portion, and a reflective layer between the bank and the color filter and overlapping at least the bank.

Inventors

• YIN CHENGZHI

Assignees

• 乐金显示有限公司

Dates

Publication Date

20260508

Application Date

20250929

Priority Date

20241108

Claims (20)

1. 1. A light emitting display device, the light emitting display device comprising: a substrate including red, green, and blue sub-pixels, each having a light emitting portion and a non-light emitting portion; A bank at the non-light emitting portions of the red, green, and blue sub-pixels; A light emitting element at each of the red, green, and blue sub-pixels; an encapsulation layer covering the light emitting element; a color filter on the encapsulation layer and overlapping the light emitting part, and And a reflective layer between the bank and the color filter and overlapping at least the bank.
2. 2. The light emitting display device of claim 1, wherein, The color filter includes a red color filter overlapping the light emitting portion of the red sub-pixel, a green color filter overlapping the light emitting portion of the green sub-pixel, and a blue color filter overlapping the light emitting portion of the blue sub-pixel, and The red color filter has an extension portion extending to the non-light emitting portion outside the light emitting portion of the red sub-pixel, and the extension portion of the red color filter is disposed to be disposed across a boundary between the red sub-pixel and the green sub-pixel or the blue sub-pixel adjacent to the red sub-pixel.
3. 3. The light emitting display device of claim 1, wherein, The color filters include red, green and blue color filters corresponding to the red, green and blue sub-pixels, and Of the overlapping areas of the red, green, and blue color filters with the bank, the overlapping area of the red color filter with the bank is the largest.
4. 4. The light emitting display device of claim 2, further comprising a dummy red filter overlapping at least one of the non-light emitting portion of the green sub-pixel or the non-light emitting portion of the blue sub-pixel.
5. 5. The light-emitting display device according to claim 4, wherein, The red filter includes a first region overlapping the light emitting portion of the red subpixel and a second region overlapping the non-light emitting portion of the red subpixel, the first and second regions being connected to each other and the second region having a shape surrounding the first region, and The second region is connected to the dummy red filter.
6. 6. The light emitting display device of claim 4, wherein the reflective layer overlaps the dummy red filter and the red filter at the non-light emitting portion of the red subpixel, respectively.
7. 7. A light emitting display device according to claim 1, wherein the reflective layer is in contact with an upper surface of the bank.
8. 8. The light emitting display device of claim 1, wherein the reflective layer is in contact with an upper surface of the encapsulation layer.
9. 9. The light emitting display device of claim 1, wherein the reflective layer is positioned in contact with a lower surface of the color filter.
10. 10. The light emitting display device of claim 1, further comprising a light shielding layer on the encapsulation layer and overlapping the non-light emitting portion, Wherein the light shielding layer overlaps at least a portion of the bank.
11. 11. The light emitting display device of claim 1, wherein the reflective layer comprises a reflective metal.
12. 12. The light emitting display device of claim 1, wherein, The light-emitting element includes a first electrode and a second electrode facing each other with an intermediate layer therebetween, and The reflective layer is electrically separated from each of the first electrode and the second electrode.
13. 13. The light emitting display device of claim 12, wherein, The intermediate layer includes a light emitting layer, a first common layer below the light emitting layer, and a second common layer above the light emitting layer, and The reflective layer is in contact with or overlaps the first common layer or the second common layer.
14. 14. A light emitting display device according to claim 1, wherein the bank comprises a black material.
15. 15. The light-emitting display device according to claim 12, wherein an edge of the first electrode located at the non-light-emitting portion is covered with the bank.
16. 16. A light emitting display device, the light emitting display device comprising: a substrate including a first subpixel, a second subpixel, and a third subpixel, each subpixel having a light emitting portion and a non-light emitting portion; A bank disposed at the non-light emitting portion of the first to third sub-pixels; a light emitting element provided at each of the first to third sub-pixels; an encapsulation layer covering the light emitting element; a color filter on the encapsulation layer and overlapping the light emitting part, and And a reflective layer located between the bank and the color filter and reflecting external light having passed through the color filter toward the color filter.
17. 17. The light emitting display device of claim 16, wherein, The color filters include first, second and third color filters corresponding to the first to third sub-pixels, respectively, The light emitting display device further includes a dummy color filter transmitting light of the same color as the first color filter at a region of the non-light emitting portion overlapping the reflective layer.
18. 18. The light emitting display device of claim 17, wherein the dummy color filter is located on the same layer as the first to third color filters.
19. 19. The light-emitting display device according to claim 17, wherein an overlapping area of the first color filter and the non-light-emitting portion is larger than an overlapping area of each of the second color filter and the third color filter and the non-light-emitting portion.
20. 20. The light-emitting display device according to claim 17, wherein a wavelength of light guided toward the color filter from below the color filter in an initial state is optically complementary to a wavelength of light configured to pass through the first color filter.

Description

Light-emitting display device Technical Field The present disclosure relates to display devices, and more particularly, for example, but not limited to, a light emitting display device having improved initial image quality and lifetime balance with respect to time variation in a structure employing an anti-reflection structure including a light shielding layer and a color filter instead of a polarizer. Background With the development of information society, the demand for display devices for displaying images is increasing in various forms. The light emitting display device having the pixel including the light emitting element does not require a separate light source unit, and thus has advantages in light weight or flexibility and has good color purity. For example, a light emitting element includes two different electrodes and a light emitting layer between the electrodes, and when an electron generated from one electrode and a hole generated from the other electrode are injected into the light emitting layer, the injected electron and hole recombine to generate an exciton, and when the generated exciton falls from an excited state to a ground state, light is emitted. The description provided in this background section should not be assumed to be prior art merely because it was mentioned in or associated with the background section. The background section may include information describing one or more aspects of the subject technology. Disclosure of Invention Accordingly, the present disclosure is directed to a light emitting display device that substantially obviates one or more problems due to limitations and disadvantages of the related art. An aspect of the present disclosure is to provide a light emitting display device that prevents external light from being reflected without using a polarizer that reduces light transmittance while improving initial image quality. Another aspect of the present disclosure is to provide a light emitting display device that makes lifetime characteristics of red, green, and blue sub-pixels similar or uniform. It is still another aspect of the present disclosure to provide a light emitting display device that prevents visibility highlighting of a specific color not only at an initial stage of an operation but also after an operation for a certain period of time. Additional advantages, aspects, 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. Aspects 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 objects and other aspects and in accordance with the purpose of the disclosure, as embodied and broadly described herein, a light emitting display device may include a substrate including red, green, and blue sub-pixels each having a light emitting portion and a non-light emitting portion, a bank at the non-light emitting portion of the red, green, and blue sub-pixels, a light emitting element at each of the red, green, and blue sub-pixels, an encapsulation layer covering the light emitting element, a color filter on the encapsulation layer and overlapping the light emitting portion, and a reflective layer between the bank and the color filter and overlapping at least the bank. In another aspect of the present disclosure, a light emitting display device may include a substrate including a first sub-pixel, a second sub-pixel, and a third sub-pixel each having a light emitting portion and a non-light emitting portion, a bank disposed at the non-light emitting portion of the first sub-pixel to the third sub-pixel, a light emitting element disposed at each of the first sub-pixel to the third sub-pixel, an encapsulation layer covering the light emitting element, a color filter on the encapsulation layer and overlapping the light emitting portion, and a reflection layer between the bank and the color filter and reflecting external light passing through the color filter toward the color filter. In yet another aspect of the present disclosure, a light emitting display device may include a substrate including first, second, and third sub-pixels each having a light emitting portion and a non-light emitting portion, a light emitting element disposed at each of the first to third sub-pixels, a color filter over the light emitting element and disposed to overlap the light emitting portions of the first to third sub-pixels, and a reflective layer disposed within the non-light emitting portions of the first to third sub-pixels and having an opening exposing the light emitting portions of the first to third sub-pixels. According to example embodiments of the present disclosure, a light emitting display device can prevent external light reflect