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US-12628513-B2 - Flexible display panel including island structures connected and stretched through electrical connecting structures, manufacturing method thereof, and display terminal

US12628513B2US 12628513 B2US12628513 B2US 12628513B2US-12628513-B2

Abstract

A flexible display panel, a manufacturing method thereof, and a display terminal are provided in the present application. The flexible display panel includes a plurality of island structures, a plurality of electrical connecting structures, and a first flexible adhesive layer. The first flexible adhesive layer is filled between the plurality of island structures and covers the plurality of island structures. A ratio of a difference between a second distance of adjacent two of the island structures in a stretched state and a first distance in an unstretched state to the first distance ranges from 10% to 20%.

Inventors

  • Zuojia WANG

Assignees

  • WUHAN CHINA STAR OPTOELECTRONICS SEMICONDUCTOR DISPLAY TECHNOLOGY CO., LTD.

Dates

Publication Date
20260512
Application Date
20220530
Priority Date
20220523

Claims (16)

  1. 1 . A flexible display panel, comprising: a plurality of island structures comprising a plurality of light emitting units, and the plurality of island structures arranged separately; a plurality of electrical connecting structures, the electrical connecting structures comprising metal lines electrically connected to the light-emitting units; wherein adjacent ones of the island structures are stretched and connected through the plurality of electrical connecting structures; and a first flexible adhesive layer filled between the plurality of island structures, and the first flexible adhesive layer covering the plurality of island structures and made of a thermoplastic hot melt adhesive that is solid at room temperature while is liquid under heating conditions; wherein when the flexible display panel is in an unstretched state, a distance between adjacent two of the island structures is a first distance, and the first distance is a minimum shrinking distance of the adjacent two of the island structures; when the flexible display panel is in a stretched state, the distance between the adjacent two of the island structures is a second distance, and the second distance is a maximum stretching distance of the adjacent two of the island structures; and a ratio of a difference between the second distance and the first distance to the first distance ranges from 10% to 20%, and each of the electrical connecting structures comprises a bending section, and a first connecting end and a second connecting end located at both sides of the bending section; the first connecting end is connected to a first island structure, and the second connecting end is connected to a second island structure, and widths of the metal lines of the first connecting end and the second connecting end are greater than a width of the metal line of the bending section.
  2. 2 . The flexible display panel as claimed in claim 1 , wherein the thermoplastic hot melt adhesive comprises resin, a tackifier, a viscosity modifier, or an antioxidant, and wherein when the thermoplastic hot melt adhesive is converted from liquid to solid, the thermoplastic hot melt adhesive is shrunk to reduce the distance between the adjacent two of the island structures.
  3. 3 . The flexible display panel as claimed in claim 2 , wherein the flexible display panel further comprises: an adhesive layer adhered to a backlight side of the flexible display panel; and a second flexible adhesive layer arranged on either side of the flexible display panel, and the second flexible adhesive layer is adhered to a surface of the backlight side of the flexible display panel through the first adhesive layer, and the second flexible adhesive layer is directly adhered to the first flexible adhesive layer on a surface of a light-emitting side of the flexible display panel; wherein a material of the second flexible adhesive layer comprises polydimethylsiloxane.
  4. 4 . The flexible display panel as claimed in claim 1 , wherein the island structures comprise: a flexible substrate; an array driving layer arranged on the flexible substrate; and a light-emitting functional layer arranged on the array driving layer, the light-emitting functional layer comprising the plurality of light-emitting units, and the light-emitting units electrically connected to a source electrode or a drain electrode of the array driving layer.
  5. 5 . The flexible display panel as claimed in claim 1 , wherein the bending section comprises: a first bending portion, a first end of the first bending portion is electrically connected to the first connecting end; and a second bending portion, a first end of the second bending portion is electrically connected to the second connecting end, and a second end of the first bending portion is electrically connected to a second end of the second bending portion; wherein a bending direction of the first bending portion is different from a bending direction of the second bending portion.
  6. 6 . The flexible display panel as claimed in claim 1 , wherein the flexible display panel further comprises: a first adhesive layer adhered to a backlight side of the flexible display panel; a second adhesive layer adhered to a light-emitting side of the flexible display panel; and a second flexible adhesive layer arranged on either side of the flexible display panel, and the second flexible adhesive layer is adhered to a surface of the backlight side of the flexible display panel through the first adhesive layer, and the second flexible adhesive layer is adhered to a surface of the light-emitting side of the flexible display panel through the second adhesive layer; wherein a material of the second flexible adhesive layer is same as the material of the first flexible adhesive layer.
  7. 7 . The flexible display panel as claimed in claim 1 , wherein the light-emitting units comprise a first color sub-pixel, a second color sub-pixel, and a third color sub-pixel with different light-emitting colors, and light-emitting areas of the first color sub-pixel, the second color sub-pixel, and the third color sub-pixel are equal.
  8. 8 . A manufacturing method of a flexible display panel, comprising: forming a stripping layer on a rigid substrate; forming a plurality of island structures comprising a plurality of light-emitting units on the stripping layer; the plurality of island structures are arranged separately; forming a first flexible adhesive layer on the plurality of island structures to form a flexible display body; wherein the first flexible adhesive layer is filled between the plurality of island structures, and the first flexible adhesive layer covers the plurality of island structures and is made of a thermoplastic hot melt adhesive that is solid at room temperature while is liquid under heating conditions; separating the flexible display body from the stripping layer; and forming a second flexible adhesive layer on either side of the flexible display body to form the flexible display panel; wherein when the flexible display panel is in an unstretched state, a distance between adjacent two of the island structures is a first distance, and the first distance is a minimum shrinking distance of the adjacent two of the island structures; when the flexible display panel is in a stretched state, the distance between the adjacent two of the island structures is a second distance, and the second distance is a maximum stretching distance of the adjacent two of the island structures; a ratio of a difference between the second distance and the first distance to the first distance ranges from 10% to 20%, and each of the electrical connecting structures comprises a bending section, and a first connecting end and a second connecting end located at both sides of the bending section; the first connecting end is connected to a first island structure, and the second connecting end is connected to a second island structure, and widths of the metal lines of the first connecting end and the second connecting end are greater than a width of the metal line of the bending section.
  9. 9 . A display terminal, wherein the display terminal comprises a terminal body and a flexible display panel, the terminal body and the flexible display panel are combined into a whole, and the flexible display panel comprises: a plurality of island structures comprising a plurality of light emitting units, and the plurality of island structures arranged separately; a plurality of electrical connecting structures, the electrical connecting structures comprising metal lines electrically connected to the light-emitting units; adjacent ones of the island structures are stretched and connected through the plurality of electrical connecting structures; and a first flexible adhesive layer filled between the plurality of island structures, and the first flexible adhesive layer covering the plurality of island structures and made of a thermoplastic hot melt adhesive that is solid at room temperature while is liquid under heating conditions; wherein when the flexible display panel is in an unstretched state, a distance between adjacent two of the island structures is a first distance, and the first distance is a minimum shrinking distance of the adjacent two of the island structures; when the flexible display panel is in a stretched state, the distance between the adjacent two of the island structures is a second distance, and the second distance is a maximum stretching distance of the adjacent two of the island structures; and a ratio of a difference between the second distance and the first distance to the first distance ranges from 10% to 20%, and each of the electrical connecting structures comprises a bending section, and a first connecting end and a second connecting end located at both sides of the bending section; the first connecting end is connected to a first island structure, and the second connecting end is connected to a second island structure, and widths of the metal lines of the first connecting end and the second connecting end are greater than a width of the metal line of the bending section.
  10. 10 . The display terminal as claimed in claim 9 , wherein the bending section comprises: a first bending portion, a first end of the first bending portion is electrically connected to the first connecting end; and a second bending portion, a first end of the second bending portion is electrically connected to the second connecting end, and a second end of the first bending portion is electrically connected to a second end of the second bending portion; wherein a bending direction of the first bending portion is different from a bending direction of the second bending portion.
  11. 11 . The display terminal as claimed in claim 9 , wherein the flexible display panel further comprises: a first adhesive layer adhered to a backlight side of the flexible display panel; a second adhesive layer adhered to a light-emitting side of the flexible display panel; and a second flexible adhesive layer arranged on either side of the flexible display panel, and the second flexible adhesive layer is adhered to a surface of the backlight side of the flexible display panel through the first adhesive layer, and the second flexible adhesive layer is adhered to a surface of the light-emitting side of the flexible display panel through the second adhesive layer; wherein a material of the second flexible adhesive layer is same as the material of the first flexible adhesive layer.
  12. 12 . The display terminal as claimed in claim 9 , wherein the thermoplastic hot melt adhesive comprises resin, a tackifier, a viscosity modifier, or an antioxidant, and wherein when the thermoplastic hot melt adhesive is converted from liquid to solid, the thermoplastic hot melt adhesive is shrunk to reduce the distance between the adjacent two of the island structures.
  13. 13 . The display terminal as claimed in claim 12 , wherein the flexible display panel further comprises: an adhesive layer adhered to a backlight side of the flexible display panel; and a second flexible adhesive layer arranged on either side of the flexible display panel, and the second flexible adhesive layer is adhered to a surface of the backlight side of the flexible display panel through the first adhesive layer, and the second flexible adhesive layer is directly adhered to the first flexible adhesive layer on a surface of a light-emitting side of the flexible display panel wherein a material of the second flexible adhesive layer comprises polydimethylsiloxane.
  14. 14 . The display terminal as claimed in claim 9 , wherein the island structures comprise: a flexible substrate; an array driving layer arranged on the flexible substrate; and a light-emitting functional layer arranged on the array driving layer, the light-emitting functional layer comprising the plurality of light-emitting units, and the light-emitting units electrically connected to a source electrode or a drain electrode of the array driving layer.
  15. 15 . The display terminal as claimed in claim 9 , wherein the light-emitting units comprise a first color sub-pixel, a second color sub-pixel, and a third color sub-pixel with different light-emitting colors, and light-emitting areas of the first color sub-pixel, the second color sub-pixel, and the third color sub-pixel are equal.
  16. 16 . The display terminal as claimed in claim 9 , wherein a structural shape of the light-emitting units is one of square, diamond, rectangular, circular, or polygonal.

Description

BACKGROUND OF DISCLOSURE Technical Field The present disclosure relates to a technical field of displays, and in particular, to a flexible display panel, a manufacturing method thereof, and a display terminal. Description of Prior Art Based on a display technology of flexible organic light emitting diodes (OLEDs), a stretchable display technology will be a key research direction of a next generation display technology. Essence of the stretchable display technology is to realize flexibility of a screen itself. Through a flexible design of a display backplane, that is, a backplane material is hollowed out in a way of patterned design, a display panel can be stretched and deformed in any direction based on an original area, so as to realize stretchable and expandable display. However, due to high-resolution requirements of the display panel, an area of the display panel that can be hollowed out is limited, that is, an area of perforating in a flexible layer has an upper limitation, which makes a stretching ratio of an existing stretchable display panel unable to be further improved. Therefore, a flexible display panel, a manufacturing method thereof, and a display terminal are urgently needed to solve the above-mentioned technical problems. BRIEF SUMMARY OF DISCLOSURE Technical Problem A flexible display panel, a manufacturing method thereof, and a display terminal are provided in the present application, so as to alleviate a technical problem that a stretching ratio of an existing stretchable display panel is small. Technical Solutions A flexible display panel is provided in the present application, which comprises: a plurality of island structures comprising a plurality of light emitting units, and the plurality of island structures arranged separately;a plurality of electrical connecting structures, the electrical connecting structures comprising metal lines electrically connected to the light-emitting units;adjacent ones of the island structures are stretched and connected through the plurality of electrical connecting structures; anda first flexible adhesive layer filled between the plurality of island structures, and the first flexible adhesive layer covering the plurality of island structures;wherein when the flexible display panel is in an unstretched state, a distance between adjacent two of the island structures is a first distance; when the flexible display panel is in a stretched state, the distance between the adjacent two of the island structures is a second distance; and a ratio of a difference between the second distance and the first distance to the first distance ranges from 10% to 20%. A manufacturing method of the flexible display panel is further provided in the present application, which comprises: forming a stripping layer on a rigid substrate;forming a plurality of island structures comprising a plurality of light-emitting units on the stripping layer; the plurality of island structures are arranged separately;forming a first flexible adhesive layer on the plurality of island structures to form a flexible display body; the first flexible adhesive layer is filled between the plurality of island structures, and the first flexible adhesive layer covers the plurality of island structures;separating the flexible display body from the stripping layer; andforming a second flexible adhesive layer on either side of the flexible display body to form a flexible display panel;wherein when the flexible display panel is in an unstretched state, a distance between adjacent two of the island structures is a first distance; when the flexible display panel is in a stretched state, the distance between the adjacent two of the island structures is a second distance; a ratio of a difference between the second distance and the first distance to the first distance ranges from 10% to 20%. A display terminal is further provided in the present application, the display terminal comprises a terminal body and a flexible display panel, the terminal body and the flexible display panel are combined into a whole, and the flexible display panel comprises: a plurality of island structures comprising a plurality of light emitting units, and the plurality of island structures arranged separately;a plurality of electrical connecting structures, the electrical connecting structures comprising metal lines electrically connected to the light-emitting units;adjacent ones of the island structures are stretched and connected through the plurality of electrical connecting structures; anda first flexible adhesive layer filled between the plurality of island structures, and the first flexible adhesive layer covering the plurality of island structures;wherein when the flexible display panel is in an unstretched state, a distance between adjacent two of the island structures is a first distance; when the flexible display panel is in a stretched state, the distance between the adjacent two of the island structures is a second distance;