Display device including color filters

Patent metadata

Field	Value
Publication number	US-10770515-B2
Application number	US-201715831060-A
Country	US
Kind code	B2
Filing date	Dec 4, 2017
Priority date	Dec 22, 2016
Publication date	Sep 8, 2020
Grant date	Sep 8, 2020

Abstract

A display can include a plurality of pixels including a first pixel, a second pixel and a third pixel; a first color filter overlapping the first and second pixels; a second color filter overlapping the first and third pixels; and a third color filter overlapping the second and third pixels.

First claim

What is claimed is:

1. A display device comprising:
a plurality of pixels including a first pixel, a second pixel and a third pixel, wherein each of the first to third pixels includes:
a thin film transistor layer disposed on a first substrate,
a first electrode connected to the thin film transistor layer,
an organic light emitting layer disposed on the first electrode, and
a second electrode disposed on the organic light emitting layer;

an encapsulation film disposed on the second electrode and covering the second electrode;
a color filter layer disposed on the encapsulation film, wherein the color filter layer includes:
a first color filter overlapping the first and second pixels,
a second color filter overlapping the first and third pixels,
a third color filter overlapping the second and third pixels, and
an overcoat layer disposed on the first, second and third color filters;

a second substrate disposed on the overcoat layer;
a bank disposed between two adjacent pixels among the first, second and third pixels; and
a protrusion including overlapping portions of the first, second and third color filters, the protrusion extending away from the encapsulation film in a direction toward the overcoat layer,
wherein the encapsulation film contacts at least two of the first, second and third color filters,
wherein a center of the protrusion overlaps with the bank and the thin film transistor,
wherein the bank is disposed between the protrusion and the thin film transistor, and
wherein a gate electrode of the thin film transistor overlaps with both of the bank and the protrusion.

2. The display device of claim 1 , wherein the first color filter is configured to pass light of a first light transmissive wavelength range and a second light transmissive wavelength range, the second color filter is configured to pass light of a third light transmissive wavelength range and a fourth light transmissive wavelength range, and the third color filter configured to pass light of a fifth light transmissive wavelength range and a sixth light transmissive wavelength range.

3. The display device of claim 2 , wherein the first light transmissive wavelength range overlaps with the third light transmissive wavelength range, the second light transmissive wavelength range overlaps with the fifth light transmissive wavelength range, and the fourth light transmissive wavelength range overlaps with the sixth light transmissive wavelength range.

4. The display device of claim 3 , wherein the first light transmissive wavelength range includes longer wavelengths than the second light transmissive wavelength range, the third light transmissive wavelength range includes longer wavelengths than the fourth light transmissive wavelength range, and the fifth light transmissive wavelength range includes longer wavelengths than the sixth light transmissive wavelength range.

5. The display device of claim 1 , further comprising a black matrix disposed at a boundary between the first and second color filters, a boundary between the second and third color filters, and a boundary between the first and third color filters.

6. The display device of claim 5 , wherein the first color filter is disposed on the black matrix, the second color filter is disposed on the black matrix and the first color filter, and the third color filter is disposed on the first and second color filters.

7. The display device of claim 5 , wherein the black matrix overlaps with the first color filter, the second color filter and the third color filter.

8. The display device of claim 5 , wherein the bank partitions the first to third pixels, wherein the black matrix overlaps with the bank, and
wherein a width of the black matrix is narrower than a width of the bank.

9. The display device of claim 1 , further comprising:
a planarization film disposed between the thin film transistor and the plurality of pixels; and
a contact hole extending through the planarization film,
wherein the first electrode extends through the contact hole and is connected to the thin film transistor, and
wherein the contact hole overlaps with both of the bank and the protrusion.

10. The display device of claim 1 , wherein a portion of the bank fills a portion of the contact hole.

11. The display device of claim 1 , wherein portions of the thin film transistor overlap with the first electrode in each of two adjacent pixels among the plurality of pixels.

12. The display device of claim 1 , wherein portions of an active layer of the thin film transistor overlap with the first electrode in each of two adjacent pixels among the plurality of pixels.

13. An organic light emitting display device comprising:
a unit pixel including a red subpixel, a green subpixel and a blue subpixel, wherein each of the red, green and blue subpixels includes:
a thin film transistor layer disposed on a first substrate,
a first electrode connected to the thin film transistor layer,
an organic light emitting layer disposed on the first electrode, and
a second electrode disposed on the organic light emitting layer;

an encapsulation film disposed on the second electrode and covering the second electrode;
a color filter layer disposed on the encapsulation film, wherein the color filter layer includes:
a first color filter extending across the red and green subpixels and configured to pass a first light transmissive wavelength range including red light and a second light transmissive wavelength range including green light,
a second color filter overlapping with the red and blue subpixels, and configured to pass a third light transmissive wavelength range including red light and a fourth light transmissive wavelength range including blue light,
a third color filter extending across the green and blue subpixels and configured to pass a fifth light transmissive wavelength range including green light and a sixth light transmissive wavelength range including blue light, and
an overcoat layer disposed on the first, second and third color filters;

a second substrate disposed on the overcoat layer;
a bank disposed between two adjacent pixels among the first, second and third pixels; and
a protrusion including overlapping portions of the first, second and third color filters, the protrusion extending away from the encapsulation film in a direction toward the overcoat layer,
wherein the encapsulation film contacts at least two of the first, second and third color filters,
wherein a center of the protrusion overlaps with the bank and the thin film transistor,
wherein the bank is disposed between the protrusion and the thin film transistor, and
wherein a gate electrode of the thin film transistor overlaps with both of the bank and the protrusion.

14. The organic light emitting display device of claim 13 , wherein a first overlapping portion where the first color filter overlaps with the second color filter is disposed in the red subpixel and the first overlapping portion is configured to block light within the second, fourth, fifth and sixth light transmissive wavelength ranges,
wherein a second overlapping portion where the first color filter overlaps with the third color filter is disposed in the green subpixel and the second overlapping portion is configured to block light within the first, third, fourth and sixth light transmissive wavelength ranges, and
wherein a third overlapping portion where the second color filter overlaps with the third color filter is disposed in the blue subpixel and the third overlapping portion is configured to block light within the first, second, third and fifth transmissive wavelength

Assignees

• Lg Display Co Ltd

Inventors

• Kim Jongsung
• Kim Ho-Jin
• Baik Seungmin

Classifications

• H10K59/8792

  comprising light absorbing layers, e.g. black layers · CPC title

• H10K59/873

  Encapsulations · CPC title

• H10K59/38 Primary

  comprising colour filters or colour changing media [CCM] · CPC title

• H10K59/1213

  the pixel elements being TFTs · CPC title

• H10K59/35 Primary

  comprising red-green-blue [RGB] subpixels · CPC title