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CN-120447247-B - COF packaging structure of narrow frame display screen

CN120447247BCN 120447247 BCN120447247 BCN 120447247BCN-120447247-B

Abstract

The application relates to a COF packaging structure of a narrow-frame display screen, which comprises a display panel, a back plate module and an outer frame, wherein the display panel comprises an upper substrate, a lower substrate and an interlayer liquid crystal layer, the width of the upper substrate is smaller than that of the lower substrate to form a step difference, the back plate module comprises a rubber frame, a membrane, a light guide plate and a reflecting sheet which are sequentially laminated, a PCB (printed circuit board) is arranged at the top of the rubber frame, the lower substrate and the PCB are connected through three-dimensional bending of the flexible circuit board, the flexible circuit board comprises a side arc section, the bending radius is 1.5-3mm, a polyimide reinforcing layer is arranged on the inner surface of the flexible circuit board, parallel reinforcing ribs are arranged on the surface of the flexible circuit board, a first magnetic body is embedded in a turning joint, a second magnetic body is arranged at the corresponding position of the lower substrate and the rubber frame, and the adjacent ends of the first magnetic body and the second magnetic body have the same polarity. The application effectively reduces the thickness of the frame on the basis of keeping the display quality of the narrow-frame liquid crystal module, and meets the ultrathin design requirement of the display screen.

Inventors

  • WU JIANG
  • He Runfei

Assignees

  • 江苏和熠光显科技有限公司

Dates

Publication Date
20260508
Application Date
20250512

Claims (6)

  1. 1. A COF packaging structure of a narrow-frame display screen comprises a display panel (1), a back plate module (2) and an outer frame (3), and is characterized in that: the display panel (1) comprises an upper substrate (11), a lower substrate (12) and an interlayer liquid crystal layer (13), wherein the width of the upper substrate (11) is smaller than that of the lower substrate (12) to form a step difference; The back plate module (2) comprises a rubber frame (21), a membrane (22), a light guide plate (23) and a reflecting sheet (24) which are sequentially laminated, and a PCB (5) is arranged at the top of the rubber frame (21); The flexible circuit board (4) is three-dimensionally bent and is connected with the lower substrate (12) and the PCB (5), and comprises: a side arc section (41) with a bending radius of 1.5-3mm, and a polyimide reinforcing layer (411) arranged on the inner surface; a bottom surface straight line section (42), and a surface is provided with parallel reinforcing ribs (421); the lower substrate (12) and the glue frame (21) are correspondingly provided with second magnetic bodies (432), the adjacent ends of the first magnetic bodies (431) and the second magnetic bodies (432) are the same in polarity, one end of the flexible circuit board (4) is connected with the top surface of the lower substrate (12), the other end of the flexible circuit board is connected with the PCB (5) at the top of the glue frame (21), a space for accommodating the flexible circuit board (4) is formed between one side of the lower substrate (12) and the glue frame (21) and the outer frame (3), shielding covers (433) are sleeved on the peripheries of the first magnetic bodies (431) and the second magnetic bodies (432), the lower substrate (12) and the second magnetic bodies (432) on the glue frame (21) are correspondingly provided, one end, far away from the first magnetic bodies (431) and the second magnetic bodies (432), of the flexible circuit board (4) is provided with a chip (44), the bottom of the back board module (2) is also provided with a board body (25), the board body (25) is provided with the ends of the board (25) and the outer frame (3) are respectively attached to the outer frame (3) along the length direction of the outer frame (3) and the length of the outer frame (31), the side plate (26) is provided with a strip-shaped groove (262) matched with the side plate, the section of the strip-shaped clamp (31) adopts an L-shaped structure, an elastic clamping block (263) used for limiting the strip-shaped clamp (31) is arranged on the inner side surface of the strip-shaped groove (262), the elastic clamping block (263) is connected with the side wall of the strip-shaped groove (262) through an elastic piece (264), the bottom of the side plate (26) is provided with a through hole (265) for accommodating an unlocking mechanism (266), the unlocking mechanism (266) is slidably arranged in the through hole (265) and used for driving the elastic clamping block (263) to unlock the strip-shaped clamp (31) in the strip-shaped groove (262), and the outer end of the unlocking mechanism (266) is horizontal to the bottom of the side plate (26).
  2. 2. The COF packaging structure of the narrow-frame display screen of claim 1, wherein the adhesive frame (21) is arranged on the inner side of the side plate (26), the top of the adhesive frame (21) is bonded with the lower substrate (12) through a double-sided adhesive (211), a strip-shaped groove (212) is formed in the bottom of the adhesive frame (21), the two sides of the adhesive frame (21) are respectively matched with the heights of the side plate (26) and the membrane (22), and the height of the membrane (22) is larger than that of the side plate (26).
  3. 3. The COF packaging structure of the narrow-frame display screen of claim 2, wherein the board body (25) is a horizontal board body (25) and is bonded with the side board (26) through heat-conducting glue, a space for accommodating the flexible circuit board (4) and the turning joint (43) is arranged between the side board (26) and the lower substrate (12), a T-shaped sliding rail (261) is arranged on the side surface of the bottom of the side board (26), and the T-shaped sliding rail (261) is matched with clamping grooves (251) formed in the periphery of the board body (25).
  4. 4. The COF packaging structure of the narrow-frame display screen of claim 1, wherein a limiting groove (2621) for accommodating the elastic clamping block (263) and the elastic piece (264) is formed in the strip-shaped groove (262), the limiting groove (2621) is communicated with a through hole (265) for accommodating the unlocking mechanism (266), an inclined plane facing the outer side of the limiting groove (2621) is adopted on the bottom surface of the elastic clamping block (263), and the strip-shaped clamp (31) and the output end of the unlocking mechanism (266) are respectively provided with an inclined plane matched with the inclined plane.
  5. 5. The COF packaging structure of the narrow-frame display screen of claim 4, wherein a limiting ring (2651) is arranged at the joint of the through hole (265) and the limiting groove (2621), at least two groups of limiting rings (2651) are arranged in the through hole (265) in an array mode, the unlocking mechanism (266) comprises an unlocking button (2661), the unlocking button (2661) comprises a driving rod (2662) and a pressing block (2663), the driving rod (2662) penetrates through the limiting ring (2651), and the pressing block (2663) is in butt joint with the limiting ring (2651) through a spring (2664).
  6. 6. The COF package structure of the narrow-frame display screen of claim 5, wherein limiting protrusions (2652) for limiting the pressing block (2663) are circumferentially arranged around the opening of the through hole (265), and positioning grooves (2665) matched with the pressing block (2663) are formed in the outer side of the pressing block.

Description

COF packaging structure of narrow frame display screen Technical Field The application relates to the technical field of liquid crystal displays, in particular to a COF packaging structure of a narrow-frame display screen. Background Nowadays, in order to meet the requirements of various high-density packages, the semiconductor packaging industry gradually develops various types of packaging designs, wherein the design concepts of various packaging structures are mostly to make the high-density packaging products thinner, so as to be suitable for electronic products which are increasingly light, thin, short and small, such as a narrow-frame liquid crystal display. In a liquid crystal module using a Light Emitting Diode (LED) backlight module, a narrow frame design is a trend, and the frame of a mature product module at present can be made to be less than 5 millimeters (mm) thick, and has a design requirement for gradually advancing to a narrower frame, especially in the design of a large-size and high-resolution module. In order to implement narrow frame design in a Light Emitting Diode (LED) liquid crystal module, and in response to the development of thin, small, functional and fast electronic products, the technology of driving chip packaging is also developing towards thinner and smaller area, such as Chip On Film (COF) package. Along with the rapid development of the panel industry, the ultra-narrow frame and the frame-free design become a big feature of the modern panel display, and the ultra-narrow frame design can make the distance of the COF connected on the glass substrate smaller and smaller. In the ultra-narrow frame design, the front end face (COF connection end face) of the glass substrate is not subjected to edging treatment, and in the testing process, small reciprocating offset movement can occur when external impact force is applied due to the reasons of assembly clearance of the front frame, strength of the front frame and the like, so that the COF is subjected to shearing of the edge of the glass substrate, COF folding damage is very easy to occur, and panel display is seriously affected. Chinese patent CN109407378B discloses a narrow-frame liquid crystal module, which comprises a display panel comprising at least one upper glass substrate and one lower glass substrate, a backlight module comprising an optical film, a back plate and at least one middle frame, wherein the back plate carries the optical film, the middle frame surrounds the back plate and carries the display panel, a printed circuit board is positioned on the surface of the middle frame, a front frame surrounds the middle frame and is used for fixing the display panel, a containing space is formed between the front frame and the middle frame, a flexible packaging assembly is positioned in the containing space, two magnetic substances are respectively positioned on the surface of the middle frame and the flexible packaging assembly, and the two magnetic substances are oppositely placed. In the prior art, magnetic substances with opposite magnetism are bonded on a middle frame and a flexible packaging component COF, the COF is positioned at a suspension position by utilizing mutual repulsive force of the two magnetic substances, so that abrasion to the COF is avoided, but the frame of the whole display screen is thicker due to the design, the requirement of ultrathin design of the display screen cannot be met, and magnetic repulsion in the design of adopting the magnetic substances on the COF easily brings magnetic field interference to influence the display quality of a narrow-frame liquid crystal module. Disclosure of Invention In order to overcome the problems in the prior art, the application provides a COF packaging structure of a narrow-frame display screen. The COF packaging structure of the narrow-frame display screen provided by the application adopts the following technical scheme: A COF packaging structure of a narrow-frame display screen comprises a display panel, a back plate module and an outer frame, wherein the display panel comprises an upper substrate, a lower substrate and an interlayer liquid crystal layer, the width of the upper substrate is smaller than that of the lower substrate to form a step difference, the back plate module comprises a rubber frame, a membrane, a light guide plate and a reflecting sheet which are sequentially laminated, a PCB (printed circuit board) is arranged on the top of the rubber frame, the lower substrate and the PCB are connected through three-dimensional bending of the flexible circuit board, the flexible circuit board comprises a side arc section with the bending radius of 1.5-3mm, a polyimide reinforcing layer is arranged on the inner surface of the flexible circuit board, parallel reinforcing ribs are arranged on the surface of the bottom straight line section, a first magnetic body is embedded in a turning joint, a second magnetic body is arranged at the position corres