# US 12,007,641 B2 · Substrate with light-shielding film, manufacturing method of the substrate, and display device having the substrate

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- Number: US 12,007,641 B2
- Document ID: US12007641B2
- Status: Granted
- Kind: B2
- Application number: 17/847,366
- Filed: 2022-06-23
- Published: 2023-01-19
- Granted: 2024-06-11
- Earliest claimed: 2021-07-14
- Assignees: Japan Display Inc.
- Applicants: Japan Display Inc.
- Inventors: Koichiro Adachi
- Web page: https://patentgrep.com/patent/US12007641B2

## CPC

- G02F 1/133512: {Light shielding layers, e.g. black matrix (G02F1/136209 takes precedence)}
- G02F 1/133502: {Antiglare, refractive index matching layers}
- G02F 1/133519: {Overcoatings}
- H10D 86/441: {Interconnections, e.g. scanning lines}
- H10D 86/60: wherein the TFTs are in active matrices
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- H10D: INORGANIC ELECTRIC SEMICONDUCTOR DEVICES

## Abstract

Disclosed is a black-matrix substrate including a substrate, a light-shielding film located over the substrate and having a plurality of openings, and a plurality of color filters arranged in the plurality of openings. The light-shielding film includes a base film over the substrate, a metal film over the base film, and a low-reflectance film located between the base film and the metal film and has an optical reflectance lower than that of the metal film. The base film may include at least one of a resin and an inorganic compound.

## Claims

### Claim 1

A black-matrix substrate comprising:
a substrate; and
a light-shielding film over the substrate, the light-shielding film having a plurality of openings and including:
a base film over the substrate;
a metal film on a top surface of the base film, a thickness of the metal film being thinner than a thickness of the base film; and
a low-reflection film located between the base film and the metal film and having an optical reflectance lower than that of the metal film, a thickness of the low-reflection film being thinner than a thickness of the base film,
wherein the substrate, the base film, the low-reflection film, and the metal film are stacked in this order,
the base film includes at least one of a resin and an inorganic compound,
the resin is selected from an acrylic resin, an epoxy resin, a polysiloxane resin, a polyimide resin, and a polyamide resin, and
the inorganic compound is selected from silicon-containing inorganic compounds.

### Claim 2 (depends on 1)

The black-matrix substrate according to claim 1,
wherein a width of the light-shielding film decreases with increasing distance from the substrate.

### Claim 3 (depends on 1)

The black-matrix substrate according to claim 1, further comprising a plurality of color filters arranged in the plurality of openings,
wherein colors of two of the color filters that are adjacent to each other are different from each other and are each different from a color of the base film.

### Claim 4 (depends on 3)

The black-matrix substrate according to claim 3,
wherein the plurality of color filters is in contact with the base film.

### Claim 5 (depends on 3)

The black-matrix substrate according to claim 3,
wherein the plurality of color filters is in contact with the substrate.

### Claim 6 (depends on 3)

The black-matrix substrate according to claim 3,
wherein at least one of the plurality of color filters covers a top surface of the metal film.

### Claim 7 (depends on 3)

The black-matrix substrate according to claim 3,
wherein a height of the plurality of color filters is smaller than a height of the light-shielding film.

### Claim 8 (depends on 3)

The black-matrix substrate according to claim 3, further comprising an overcoat in contact with top surfaces of the color filters and the light-shielding film.

### Claim 9 (depends on 1)

The black-matrix substrate according to claim 1,
wherein top surfaces of the substrate and the light-shielding film are in contact with an overcoat.

### Claim 10 (depends on 1)

The black-matrix substrate according to claim 1,
wherein the base film has a light-transmitting property.

### Claim 11 (depends on 1)

A display device comprising:
an array substrate comprising a plurality of pixels; and
the black-matrix substrate according to claim 1, the black-matrix substrate being located over the array substrate,
wherein the black-matrix substrate further comprises a plurality of color filters arranged in the plurality of openings, and
the black-matrix substrate is arranged so that the light-shielding film is positioned between the substrate and the array substrate.