Organic light emitting diode display with color-correction component having different color mixing weights

Patent metadata

Field	Value
Publication number	US-12429641-B2
Application number	US-202418650643-A
Country	US
Kind code	B2
Filing date	Apr 30, 2024
Priority date	Apr 18, 2018
Publication date	Sep 30, 2025
Grant date	Sep 30, 2025

Abstract

An organic light emitting diode (OLED) display includes a pixelated OLED display panel and a color-correction component disposed on the pixelated OLED display panel. The pixelated OLED display panel has a ratio of blue-to-red color mixing weights at 30 degrees of β 0 30 , and a ratio of blue-to-red color mixing weights at 45 degrees of β 0 45 , where β 0 45 ≥β 0 30 ≥1.05 and 1.5≥β 0 45 ≥1.1. The color-correction component is configured such that a ratio of blue-to-red color mixing weights at 45 degrees of the display is β 45 and a ratio of blue-to-red color mixing weights at 30 degrees of the display is β 30 , where β 0 45 −0.1≥β 45 ≥2.1−β 0 45 and β 0 30 −0.05≥β 30 ≥2.05−β 0 30 . Methods of making OLED displays are described.

First claim

What is claimed is:

1. An organic light emitting diode (OLED) display comprising:
a pixelated OLED display panel having a ratio of blue-to-red color mixing weights at 30 degrees of β 0 30 , and a ratio of blue-to-red color mixing weights at 45 degrees of β 0 45 , wherein β 0 45 >β 0 30 ≥1.05 and 1.5≥β 0 45 ≥1.1; and
a color-correction component disposed on the pixelated OLED display panel, the color-correction component configured such that a ratio of blue-to-red color mixing weights at 45 degrees of the display is β 45 and a ratio of blue-to-red color mixing weights at 30 degrees of the display is β 30 , wherein β 0 45 −0.1≥β 45 ≥2.1−β 0 45 and β 0 30 −0.05≥β 30 ≥2.05−β 0 30 .

2. The display of claim 1 , wherein 1.4≥β 0 45 ≥1.19 and 1.08≥β 45 ≥0.92.

3. The display of claim 1 , wherein 1.25≥β 0 30 ≥1.07 and 1.04≥β 30 ≥0.96.

4. The display of claim 1 , wherein β 0 45 −β 0 30 ≥0.05.

5. The display of claim 1 , wherein 1.26≥β 0 30 ≥1.1 and 1.35≥β 0 45 ≥1.19.

6. The display of claim 1 , wherein β 45 is no more than β 0 45 −0.15.

7. The display of claim 1 , wherein the pixelated OLED display panel has a ratio of green-to-red color mixing weights at 45 degrees, γ 0 45 , of at least 1.03 and a ratio of green-to-red color mixing weights at 45 degrees of the display, γ 45 , is no more than γ 0 45 −0.01 and 1.02≥γ 45 ≥0.98.

8. The display of claim 1 , wherein a white-point axial efficiency of the display is at least 35 cd/A.

9. The display of claim 1 , wherein the pixelated OLED display panel has a maximum white-point color shift from 0 to 45 degrees of WPCS 0 45 , WPCS 0 45 being at least 0.015.

10. The display of claim 1 , wherein the pixelated OLED display panel comprises a plurality of pixels, each pixel comprising a plurality of subpixels, each subpixel comprising a plurality of OLED layers, wherein a comparative display panel otherwise equivalent to the pixelated OLED display panel but having one or more different thicknesses of the OLED layers has a maximum white-point color shift from 0 to 45 degrees of WPCS C 45 , WPCS C 45 being no more than WPCS 0 45 −0.005.

11. The display of claim 10 , wherein the color-correction component is configured such that a maximum white-point color shift from 0 to 45 degrees of the display, WPCS 45 , is no more than 0.01.

12. The display of claim 10 , wherein the color-correction component is configured such that a maximum white-point color shift from 0 to 45 degrees of the display, WPCS 45 , is no more than WPCS C 45 −0.005.

13. The display of claim 10 , wherein a blue axial efficiency of the display is at least 10% greater than a blue axial efficiency of the comparative display panel.

14. The display of claim 10 , wherein the display panel has a white-point axial efficiently of WPAE 0 , the comparative display panel has a white-point axial efficiently of WPAE C , and WPAE C is no less than WPAE 0 −1 Cd/A.

15. The display of claim 1 , wherein the color-correction component comprises a wavelength and polarization dependent partial reflector comprising an optical stack, the optical stack comprising a plurality of optical repeat units, each optical repeat unit including first and second polymer layers, a refractive index difference between the first and second polymer layers along a first axis being Δny, a refractive index difference between the first and second polymer layers along an orthogonal second axis being Δnx, |Δnx| being at least 0.1 and |Δny| being no more than 0.04, wherein for refractive indices along the second axis, the optical repeat units have a smallest optical thickness T1 proximate a first side of the optical stack and a largest optical thickness T2 proximate an opposite second side of the optical stack, (T2−T1)/(T2+T1) being in a range of 0.05 to 0.2, T2 being at least 350 nm and no more 1250 nm.

16. The display of claim 1 , wherein the color-correction component comprises a color-correction film, the color-correction film comprising:
a plurality of microlayers, each microlayer having a maximum difference among its three orthogonal refractive indices at 550 nm is less than or equal to 0.05, each microlayer having an average refractive index being the arithmetic average of the three orthogonal refractive indices at 550 nm;
wherein the plurality of microlayers is configured into layer pairs of alternating high and low index microlayers, and wherein the average refractive index of each high index microlayer is between 0.15 and 0.75 more than the average refractive index of each low index microlayer;
wherein the layer pairs each have optical thicknesses at 550 nm between 150 nm and 550 nm, and at least half of the layer pairs have optical thicknesses at 550 nm between 275 nm and 400 nm;
wherein the color-correction film has few enough microlayers to transmit at least 80% of unpolarized visible light at normal incidence, photopically weighted; and
wherein the color-correction film has enough microlayers to reflect at least 15% of at least one wavelength of unpolarized light at 60 degrees incidence.

17. The display of claim 1 , wherein the color-correction component comprises a polymeric film, the polymeric film comprising a first polymeric layer having two major surfaces, wherein the first polymeric layer comprises:
a first polymer region comprising a first material having a refractive index of n;
a second region comprising a network of interconnected pores and channels within the first polymer region, the channels comprising a second material having a refractive index of n 2 ,
wherein the first material comprises a first elastic polymeric material and optional particles; and
wherein the second material comprises a second polymeric material and optional particles; and/or air.

18. The display of claim 1 , wherein the color-correction component comprises a polymeric film, the polymeric film comprising a first polymeric layer having two major surfaces, wherein the first polymeric layer is void free and comprises:
a first polymeric matrix having a refractive index n 1 ; and
particles having a refractive index n 2 uniformly dispersed within the first polymeric matrix; the particles being present in an amount of less than 30 vol-%, based on the volume of the first polymeric layer, and having a particle size range of 400 nm to 3000 nm, n 2 being different than n 1 .

19. The display of claim 1 , wherein the color-correction component comprises first and second layers and a nanostructured interface therebetween.

20. A method of making an organic light emitting diode (OLED) display, the method comprising:
providing an OLED display panel such that each comparative display panel in a plurality of comparative display panels otherwise equivalent to the OLED display panel except for one or more values of a plurality of design parameters has a maximum white-point color shift as a view angle varies from 0 to 45 degrees of WPCS C 45 , a white-point axial efficiency of WPAE C , and a blue axial efficiency of BAE C , the providing step comprising selecting the plurality of design parameters such that the OLED display panel has a maximum white-point color shift as a view angle varies from 0 to 45 degrees of WPCS 0 45 and a white-point axial efficiency of WPAE 0 , wherein for at least one comparative display panel, WPCS C 45 is no more than WPCS 0 45 −0.005 and WPAE C is no less than WPAE 0 minus a luminous intensity produced per unit of current of 1 Cd/A; and
disposing a color-correction component on the OLED display panel

Assignees

• 3M Innovative Properties Company

Inventors

• Erickson Nicholas C
• Freier David G
• Brott Robert L
• Hao Bing
• Rosen David A
• Menke Stephen M
• Chien Bert T
• Lee Seong Taek
• Hao Encai
• Yang Zhaohui
• Everaerts Albert I
• Lu Yongshang
• Kolb William Blake
• Bruesewitz Keith R
• Haag Adam D
• Park Sun-Yong
• Nevitt Timothy J
• Wheeler Brianna N
• Peterson Jody L
• Benoit Gilles J

Classifications

• H10K59/50

  OLEDs integrated with light modulating elements, e.g. with electrochromic elements, photochromic elements or liquid crystal elements · CPC title

• H10K59/35

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

• A23K10/18

  of live microorganisms · CPC title

• C12N1/14

  Fungi (culture of mushrooms A01G18/00; as new plants A01H15/00); Culture media therefor · CPC title

• C12N11/14

  Enzymes or microbial cells immobilised on or in an inorganic carrier · CPC title