# US 12,179,464 B2 · Method for manufacturing ultra-thin glass, ultra-thin glass, and display device including the ultra-thin glass

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- Number: US 12,179,464 B2
- Document ID: US12179464B2
- Status: Granted
- Kind: B2
- Application number: 17/843,783
- Filed: 2022-06-17
- Published: 2022-12-22
- Granted: 2024-12-31
- Earliest claimed: 2021-06-18
- Assignees: LG Display Co., Ltd.
- Applicants: LG Display Co., Ltd.
- Inventors: Doowon Seo; Wooseok Roh; Moongoo Kim; Chan Park; Eungchul Park
- Web page: https://patentgrep.com/patent/US12179464B2

## CPC

- B32B 17/06: comprising glass as the main or only constituent of a layer, next to another layer of a specific {material}
- B32B 3/30: characterised by a layer formed with recesses or projections, e.g. {hollows, grooves, protuberances, ribs (apertured layer B32B3/266; layer with cavities or internal voids B32B3/26)}
- B32B 37/16: with all layers existing as coherent layers before laminating
- B32B 38/10: Removing layers, or parts of layers, mechanically or chemically
- C03C 15/00: Surface treatment of glass, not in the form of fibres or filaments, by etching (etching or surface-brightening compositions, in general C09K13/00)
- C03C 17/002: {for flat glass, e.g. float glass}
- C03C 23/0025: {by a laser beam}
- G02F 1/133331: {Cover glasses}
- H10K 59/12: Active-matrix OLED [AMOLED] displays
- H10K 59/871: {Self-supporting sealing arrangements}
- H10K 71/851: {Division of substrate}
- H10K 77/10: Substrates, e.g. flexible substrates
- B32B 2315/08: Glass
- B32B 2457/20: Displays, e.g. liquid crystal displays, plasma displays
- C03C 2217/78: Coatings specially designed to be durable, e.g. scratch-resistant
- C03C 2218/11: from solutions or suspensions
- G02F 1/133305: {Flexible substrates, e.g. plastics, organic film}
- H10K 59/35: comprising red-green-blue [RGB] subpixels
- H10W 90/00: Package configurations
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- C03C: CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- 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
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10

## Abstract

Disclosed is a method for manufacturing ultra-thin glass. The method includes: patterning, on a mother glass substrate comprising a plurality of display cells and a dummy area surrounding the display cells, a cutting line having a shape corresponding to the display cells; forming a mother glass protective film on the mother glass substrate; forming a through-hole which corresponds to the cutting line by etching the mother glass substrate; and cutting bridges which are formed by the mother glass substrate and connect the through-holes.

## Claims

### Claim 1

A method for manufacturing ultra-thin glass, the method comprising:
patterning a plurality of display cells on a first glass substrate;
patterning a dummy area adjacent to the display cells on the first glass substrate;
forming a plurality of cutting lines, including each of the plurality of cutting lines defining each of the plurality of display cells, each of the plurality of cutting lines having a closed-loop shape surrounding each of the plurality of display cells and the plurality of cutting lines comprising a plurality of patterns arranged in the closed-loop shape and spaced apart from each other;
forming a protective film on the first glass substrate;
forming a plurality of through-holes at the plurality of patterns of the plurality of cutting lines, including forming a plurality of bridges between the plurality of through-holes, each of the plurality of bridges including a glass member that extends from one through hole to another through hole of the plurality of through holes; and
cutting the plurality of bridges, including separating each of the plurality of display cells from each other and forming portions of the plurality of bridges that protrude from at least one side of each of the plurality of display cells.

### Claim 2 (depends on 1)

The method of claim 1, wherein the forming the protective film on the first glass substate comprises:
laminating an acid-resistant film on at least a portion of the dummy area of the first glass substrate or coating or depositing an acid-resistant solution in at least a portion of the dummy area of the first glass substrate.

### Claim 3 (depends on 2)

The method of claim 2, wherein the forming the plurality of through-holes comprises:
etching the first glass substrate,
wherein an area where the protective film is not formed is eroded by the etching of the first glass substrate and has a first thickness after the etching of the first glass substrate, and
wherein another area where the protective film is formed is not eroded and has a second thickness larger than the first thickness after the etching of the first glass substrate.

### Claim 4 (depends on 3)

The method of claim 3, wherein the first thickness is 20 um to 100 um, and the second thickness is 70 um to 1.3 mm.

### Claim 5 (depends on 1)

The method of claim 1, further comprising strengthening the first glass substrate after the forming the plurality of through-holes.