Touch display device and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-2021333902-A1
Application number	US-201916626527-A
Country	US
Kind code	A1
Filing date	Dec 6, 2019
Priority date	Oct 12, 2019
Publication date	Oct 28, 2021
Grant date	—

Abstract

A touch display device and a manufacturing method thereof are provided. During a panel bonding process, a display panel and a touch panel are adhered by a liquid optical clear adhesive using a full lamination technology. A cover is then adhered to the touch panel by a solid optically clear adhesive using a frame bonding technology to form a vacuum chamber. The cover, the touch panel, and the display panel in the formed touch display device are closely adhered to each other. Moreover, an optical adhesive material is effectively saved.

First claim

What is claimed is:

1 . A manufacturing method of a touch display device, comprising:
providing a display panel; covering an upper surface of the display panel with a full-surface adhesive layer, wherein the full-surface adhesive layer comprises a liquid optical clear adhesive; disposing a touch panel on the upper surface of the display panel, so that the touch panel corresponds to a middle of the display panel, and a lower surface of the touch panel is attached to an upper surface of the full-surface adhesive layer; attaching a first sub frame adhesive layer to an edge of an upper surface of the touch panel, wherein the first sub frame adhesive layer comprises a liquid adhesive; cutting a solid optically clear adhesive into an adhesive strip and attaching the adhesive strip to an upper surface of the first sub frame adhesive layer, wherein a width of the adhesive strip is less than a width of the first sub frame adhesive layer; disposing a cover on the upper surface of the touch panel, so that the cover corresponds to a middle portion of the touch panel, and an upper surface of the adhesive strip is attached to a lower surface of the cover; heating the cover, the touch panel, and the display panel which are attached with the corresponding adhesive layer under a vacuum environment, so that the adhesive strip is melted; and irradiating the cover, the touch panel, and the display panel which are attached with the corresponding adhesive layer with ultraviolet ray under the vacuum environment such that the full-surface adhesive layer is cured, and the melted adhesive strip is cured into a second sub frame adhesive layer, and a vacuum chamber is formed on middle portions of the first sub frame adhesive layer and the second sub frame adhesive layer.

2 . The manufacturing method as claimed in claim 1 , wherein the touch panel and the display panel are adhered by the liquid optical clear adhesive using a full lamination technology.

3 . The manufacturing method as claimed in claim 1 , wherein the step of cutting the solid optically clear adhesive into the adhesive strip and attaching the adhesive strip to the upper surface of the first sub frame adhesive layer further comprises:
cutting the solid optically clear adhesive into four adhesive strips; connecting the four adhesive strips in end-to-end relation to form a ring-shaped; and attaching the ring-shaped adhesive strips to the upper surface of the first sub frame adhesive layer.

4 . The manufacturing method as claimed in claim 1 , wherein the step of heating the cover, the touch panel, and the display panel which are attached with the corresponding adhesive layer under the vacuum environment, so that the adhesive strip is melted, further comprises:
transferring the cover, the touch panel, and the display panel which are attached with the corresponding adhesive layer to a vacuum apparatus; vacuuming the vacuum apparatus in a sealed environment using a vacuum pump; and heating the cover, the touch panel, and the display panel which are attached with the corresponding adhesive layer using a heating module of the vacuum apparatus, so that the adhesive strip is melted.

5 . The manufacturing method as claimed in claim 1 , wherein a width of the second sub frame adhesive layer is less than or equal to a width of the first sub frame adhesive layer.

6 . The manufacturing method as claimed in claim 1 , wherein a shape of the touch panel is the same as a shape of the display panel, and a size of the touch panel is the same as a size of the display panel.

7 . A touch display device, comprising:
a display panel; a full-surface adhesive layer covering an upper surface of the display panel; a touch panel attached to an upper surface of the full-surface adhesive layer, wherein the touch panel corresponds to a middle portion of the display panel; a frame adhesive layer attached to an edge of an upper surface of the touch panel; a vacuum chamber formed on a middle portion of the frame adhesive layer; and a cover attached to an upper surface of the frame adhesive layer, wherein the cover corresponds to a middle portion of the touch panel.

8 . The touch display device as claimed in claim 7 , wherein the full-surface adhesive layer comprises a liquid optical clear adhesive, and the touch panel and the display panel are adhered by the liquid optical clear adhesive using a full lamination technology; and
the frame adhesive layer comprises a solid optically clear adhesive, and the cover and the touch panel are adhered by the solid optically clear adhesive using a frame bonding technology.

9 . The touch display device as claimed in claim 7 , wherein the frame adhesive layer comprises:
a first sub frame adhesive layer attached to the edge of the upper surface of the touch panel; and a second sub frame adhesive layer attached to an upper surface of the first sub frame adhesive layer, wherein the vacuum chamber is formed on middle portions of the first sub frame adhesive layer and the second sub frame adhesive layer.

10 . The touch display device as claimed in claim 9 , wherein the first sub frame adhesive layer comprises a liquid adhesive or a solid adhesive; and
the second sub frame adhesive layer comprises a solid optically clear adhesive, and a width of the second sub frame adhesive layer is less than or equal to a width of the first sub frame adhesive layer.

11 . The touch display device as claimed in claim 9 , wherein a shape of the second sub frame adhesive layer comprises a ring-shaped.

12 . The touch display device as claimed in claim 7 , wherein a shape of the touch panel is the same as a shape of the display panel, and a size of the touch panel is the same as a size of the display panel.

13 . A manufacturing method of a touch display device, comprising:
providing a display panel; covering an upper surface of the display panel with a full-surface adhesive layer; disposing a touch panel on the upper surface of the display panel, so that the touch panel corresponds to a middle portion of the display panel, and a lower surface of the touch panel is attached to an upper surface of the full-surface adhesive layer; attaching a frame adhesive layer to an edge of an upper surface of the touch panel; disposing a cover on the upper surface of the touch panel, so that the cover corresponds to a middle portion of the touch panel, and an upper surface of the frame adhesive layer is attached to a lower surface of the cover; and irradiating the cover, the touch panel, and the display panel which are attached with the corresponding adhesive layer with ultraviolet ray under a vacuum environment such that the full-surface adhesive layer and the frame adhesive layer are cured, and a vacuum chamber is formed on a middle portion of the frame adhesive layer.

14 . The manufacturing method as claimed in claim 13 , wherein the full-surface adhesive layer comprises a liquid optical clear adhesive, and the touch panel and the display panel are adhered by the liquid optical clear adhesive using a full lamination technology; and
the frame adhesive layer comprises a solid optically clear adhesive, and the cover and the touch panel are adhered by the solid optically clear adhesive using frame bonding technology.

15 . The manufacturing method as claimed in claim 13 , wherein the step of attaching the frame adhesive layer to the edge of the upper surface of the touch panel comprises:
attaching a first sub frame adhesive layer to the edge of the upper surface of the touch panel, cutting a solid optically clear adhesive into an adhesive strip, and attachin

Assignees

• Shenzhen China Star Optoelectronics Semiconductor Display Tech Co Ltd

Inventors

• Zhou Mingjun
• Shi Zhenhua

Classifications

• B32B17/06

  comprising glass as the main or only constituent of a layer, next to another layer of a specific {material} · CPC title

• B32B2250/44

  Number of layers variable across the laminate · CPC title

• B32B2457/208

  Touch screens · CPC title

• B32B2457/202

  LCD, i.e. liquid crystal displays · CPC title

• B32B2457/206

  Organic displays, e.g. OLED · CPC title