# US 12,761,406 B2 · Optical member having a plurality of layers with different refractive indices and display apparatus comprising the same

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- Number: US 12,761,406 B2
- Document ID: US12761406B2
- Status: Granted
- Kind: B2
- Application number: 18/238,342
- Filed: 2023-08-25
- Published: 2024-06-27
- Granted: 2026-10-13
- Earliest claimed: 2022-12-27
- Assignees: LG Display Co., Ltd.
- Applicants: LG Display Co., Ltd.
- Inventors: SunWoong Kim; JuHun Min; SeungSoo Yang; ChangHee Choi
- Web page: https://patentgrep.com/patent/US12761406B2

## CPC

- G02B 5/0205: {characterised by the diffusing properties}
- G02B 1/04: made of organic materials, e.g. plastics (G02B1/08 takes precedence)
- G02B 5/0278: {used in transmission}
- H10K 59/38: comprising colour filters or colour changing media [CCM]
- H10K 59/879: {comprising refractive means, e.g. lenses}
- H10K 59/12: Active-matrix OLED [AMOLED] displays
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

An optical member capable of improving a vision recognition rate of a mark used for alignment such as bonding alignment, and a display apparatus including the same are discussed. The optical member can include a first layer having a pattern portion, and a second layer covering the pattern portion. At least one of the first layer or the second layer has a refractive index that is varied depending on different wavelength areas, where the wavelength areas include a visible ray area and an infrared area having a wavelength longer than that of the visible ray area. A difference in a refractive index between the first layer and the second layer is greater in the visible ray area than the infrared area.

## Claims

### Claim 1

A display apparatus comprising:
a display panel configured to display an image; and
an optical panel coupled to an upper side or lower side of the display panel,
wherein the optical panel includes an optical member,
wherein the optical member includes:
a first layer including a pattern portion; and
a second layer covering the pattern portion,
wherein at least one of the first layer or the second layer has a refractive index varied depending on different wavelength areas,
wherein the different wavelength areas include a visible ray area and an infrared area having a wavelength longer than a wavelength of the visible ray area,
wherein a difference in a refractive index between the first layer and the second layer is greater in the visible ray area than the infrared area,
wherein the display panel includes:
a substrate including a plurality of pixels having a plurality of subpixels; and
an opposing substrate to face the substrate,
wherein the opposing substrate includes an alignment mark in a non-display area,
wherein the substrate includes a sub-alignment mark in the non-display area, and
wherein the first layer and the second layer overlap the alignment mark and the sub-alignment mark.

### Claim 2 (depends on 1)

The display apparatus of claim 1, wherein the pattern portion of the first layer includes a plurality of concave portions and a plurality of convex portions between the plurality of concave portions.

### Claim 3 (depends on 2)

The display apparatus of claim 2, wherein the refractive index of the second layer is greater than the refractive index of the first layer, and
wherein a change in the refractive index of the second layer from the visible ray area to the infrared area is greater than a change in the refractive index of the first layer from the visible ray area to the infrared area.

### Claim 4 (depends on 3)

The display apparatus of claim 3, wherein the difference in the refractive index between the first layer and the second layer in the visible ray area is greater than 0.03 and is equal to or less than 0.4.

### Claim 5 (depends on 3)

The display apparatus of claim 3, wherein the difference in the refractive index between the first layer and the second layer in the infrared area is in a range of 0 to 0.03.

### Claim 6 (depends on 3)

The display apparatus of claim 3, wherein the second layer includes an acrylate based compound containing at least one of epoxy acrylate or fluorine epoxy acrylate, or a compound containing silicon (Si), titanium (Ti), sulfur(S), aluminum (Al), zinc (Zn), tantalum (Ta), magnesium (Mg), yttrium (Y), and/or hafnium (Hf).

### Claim 7 (depends on 3)

The display apparatus of claim 3, wherein the first layer includes an acrylate-based compound containing at least one of silicon modified acrylate or urethane acrylate, or a compound containing zirconium (Zr), fluorine (F) and sodium (Na).

### Claim 8 (depends on 1)

The display apparatus of claim 1, wherein the pattern portion of the first layer includes a plurality of scattering portions.

### Claim 9 (depends on 8)

The display apparatus of claim 8, wherein the plurality of scattering portions have a refractive index greater than the refractive index of the second layer, and
wherein a change in the refractive index of the plurality of scattering portions from the visible ray area to the infrared area is greater than a change in the refractive index of the second layer from the visible ray area to the infrared area.

### Claim 10 (depends on 9)

The display apparatus of claim 9, wherein the plurality of scattering portions include a first material having at least one of silicon oxide (SiO2), titanium oxide (TiO2), silicon nitride (SixNy), silicon oxide nitride (SiON), aluminum oxide (AlOx), aluminum nitride (AlON), zinc oxide (ZnO), tantalum pentoxide (Ta2O5), magnesium fluoride (MgF2), yttrium oxide (Y2O3) or hafnium oxide (HfO2), and/or a polymethyl methacrylate (PMMA), polycarbonate (PC), polyethylene terephthalate (PET), polyurethane (PU), polystyrene (PS) and nylon-based material to which the first material is added.

### Claim 11 (depends on 9)

The display apparatus of claim 9, wherein the second layer includes an acrylate-based compound that includes at least one of silicone-modified acrylate or urethane acrylate, or a compound containing zirconium (Zr), fluorine (F) and sodium (Na).

### Claim 12 (depends on 8)

The display apparatus of claim 8, wherein the refractive index of the second layer is greater than the refractive index of the plurality of scattering portions, and
wherein a change in the refractive index of the second layer from the visible ray area to the infrared area is greater than a change in the refractive index of the plurality of scattering portions from the visible ray area to the infrared area.

### Claim 13 (depends on 12)

The display apparatus of claim 12, wherein the second layer includes an acrylate based compound containing at least one of epoxy acrylate, fluorine epoxy acrylate, silicon modified acrylate or urethane acrylate, or a compound containing silicon (Si), titanium (Ti), sulfur(S), aluminum (Al), zinc (Zn), tantalum (Ta), magnesium (Mg), yttrium (Y), and/or hafnium (Hf).

### Claim 14 (depends on 12)

The display apparatus of claim 12, wherein the plurality of scattering portions include a second material that includes at least one of polymethyl methacrylate (PMMA), polycarbonate (PC), polyethylene terephthalate (PET), or sodium hexafluoroaluminate (Na3AlF6), and/or a polyurethane (PU), polystyrene (PS) and nylon-based material to which the second material is added.

### Claim 15 (depends on 8)

The display apparatus of claim 8, wherein the plurality of scattering portions have a haze that is in a rage of 0% to 90%.

### Claim 16 (depends on 1)

The display apparatus of claim 1, wherein the display panel further includes:
a light extraction portion disposed on the substrate and in each of the plurality of subpixels, and
wherein in each of the plurality of subpixels, the light extraction portion overlaps at least one of a plurality of concave portions and a plurality of convex portions included in the pattern portion of the first layer in the optical member.

### Claim 17 (depends on 16)

The display apparatus of claim 16, wherein the display panel further includes:
a light emitting element layer on the light extraction portion; and
a color filter layer configured to color-convert light emitted from the light emitting element layer, and
wherein the color filter layer is between the light emitting element layer and the optical member.

### Claim 18 (depends on 16)

The display apparatus of claim 16, wherein the light extraction portion includes a plurality of concave patterns and a plurality of convex patterns between the concave patterns, and
wherein a pitch of the plurality of convex portions of the first layer in the optical member is greater than a pitch of the plurality of convex patterns of the light extraction portion, or one of the plurality of convex portions overlaps several of the plurality of convex patterns.