CN215729158U

CN215729158U - Bonding structure of liquid crystal glass and FPC (flexible printed circuit) of display screen

Info

Publication number: CN215729158U
Application number: CN202121747253.7U
Authority: CN
Inventors: 郭晓琴; 骆志锋; 罗俊; 萧逸; 尹智杰
Original assignee: Shenzhen Tongxingda Technology Co Ltd
Current assignee: Shenzhen Tongxingda Technology Co Ltd
Priority date: 2021-07-27
Filing date: 2021-07-27
Publication date: 2022-02-01
Anticipated expiration: 2031-07-27

Abstract

The utility model discloses a bonding structure of liquid crystal glass and an FPC (flexible printed circuit) of a display screen, which comprises the liquid crystal glass and the FPC which are bonded together, wherein alignment marks are correspondingly arranged at two ends of a bonding area of the liquid crystal glass and the FPC, and the two groups of alignment marks are superposed after being bonded; the distance between each group of alignment marks is more than or equal to the limit value of visual alignment; the bonding area of the liquid crystal glass comprises a PIN foot area and an empty PIN area, and the thickness of the empty PIN area is the same as that of the PIN foot area. The utility model solves the problems that visual alignment is not accurate if the bonding width is too narrow in the bonding process of the small-size liquid crystal display module, and the bonding effect is influenced because the height difference appears on two sides of the bonding area of the liquid crystal glass if the bonding width is increased. And the design is ingenious, the operation is easy, and the method is worthy of vigorous popularization.

Description

Bonding structure of liquid crystal glass and FPC (flexible printed circuit) of display screen

Technical Field

The utility model relates to the technical field of production of liquid crystal display modules, mobile phones, wearable equipment and the like, in particular to a bonding structure of liquid crystal glass and FPC (flexible printed circuit) of a display screen.

Background

In the production of liquid crystal display modules, generally, the ITO area of the liquid crystal glass is bonded to the FPC, so as to realize the display function of the display screen. In the production of small-size liquid crystal display module especially wearable for the equipment liquid crystal display module, because of the display panel size is less, the display screen module that corresponds also is less with FPC's bonding position size. The display screen is connected with the FPC in a bonding mode through glass ITO (metal oxide conductive circuit). For a small-sized liquid crystal display module, the width of the effective ITO is 4-5mm, and the existing bonding equipment has the minimum distance requirement for alignment photographing, as shown in fig. 1, if the distance L between two alignment points is smaller than the minimum distance requirement, the bonding grabbing point is easy to be unstable, that is: there is a tendency for the alignment site to be inaccessible, resulting in a misaligned bond. Therefore, two alignment points with a pitch equal to or greater than the minimum pitch requirement are typically provided at both ends of the FPC bonding. However, when the width M of the ITO area of the liquid crystal glass is smaller than the distance L between the two alignment marks, the PIN in the ITO area has a certain thickness, so that there is a height difference between the area of the liquid crystal glass bonding area without the PIN and the ITO area, and after bonding, the ACF glue often adheres poorly in the areas without the PIN on both sides of the ITO area, and the phenomenon that both sides of the bonding area fall off and peel off from the edges due to the shaking of the FPC can occur, resulting in poor bonding.

Therefore, the bonding process of the small-sized lcd module needs to be improved to solve the above technical problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects in the prior art, and aims to improve the bonding structure of the small-size liquid crystal display module so as to solve the problem that ACF glue is not firmly bonded on two sides of an ITO (indium tin oxide) area of liquid crystal glass due to the height difference of the ITO area under the condition that the bonding structure meets the requirement of visual alignment.

The technical scheme of the utility model is as follows: the utility model provides a bonding structure of liquid crystal glass and an FPC (flexible printed circuit) of a display screen, which comprises the liquid crystal glass and the FPC which are bonded together, wherein alignment marks are correspondingly arranged at two ends of a bonding area of the liquid crystal glass and the FPC, and the two groups of alignment marks are overlapped after being bonded; the distance between each group of alignment marks is more than or equal to the limit value of visual alignment; the bonding area of the liquid crystal glass comprises a PIN foot area and an empty PIN area, and the thickness of the empty PIN area is the same as that of the PIN foot area.

Further the empty PIN field includes: the PIN foot region comprises a first empty PIN region and a second empty PIN region, the width of the first empty PIN region is the same as that of the second empty PIN region, and the first empty PIN region and the second empty PIN region are arranged on two sides of the PIN foot region.

Further, the limit value of the visual alignment is 6 mm.

Further, the width of the PIN foot region is 6mm or less.

Further, the liquid crystal glass and the FPC are bonded together by ACF glue.

Further, the thickness of PIN foot region and empty PIN region is 0.4-0.6 um.

By adopting the scheme, the bonding structure of the liquid crystal glass and the FPC of the display screen has the following beneficial effects:

(1) the empty PIN area is arranged in the non-ITO area of the bonding area of the liquid crystal glass, so that the thickness of the empty PIN area is the same as that of the ITO area, and the problem that the non-ITO area and the ITO area in the prior art are not firmly bonded due to height difference is solved, and poor bonding is caused.

(2) The alignment marks are arranged on the FPC and the liquid crystal glass and are larger than the limit value of visual alignment, so that accurate alignment in the bonding process is guaranteed.

Drawings

Fig. 1 is a schematic diagram illustrating bonding of an FPC and liquid crystal glass in the prior art.

FIG. 2 is a schematic front view of a bonding structure of liquid crystal glass and an FPC of a display panel according to the present invention.

FIG. 3 is a schematic side view of a bonding structure of liquid crystal glass and an FPC of a display panel according to the present invention.

Detailed Description

The utility model is described in detail below with reference to the figures and the specific embodiments.

As shown in fig. 2-3, the present invention provides a bonding structure of liquid crystal glass and FPC for a display screen, the bonding structure comprising: liquid crystal glass 10 and FPC20 bonded together by ACF glue. Two alignment marks are arranged in the bonding area of the liquid crystal glass 10, the alignment marks are correspondingly arranged in the bonding area of the FPC20, and the two groups of alignment marks 30 are overlapped after being bonded. The distance L1 between each set of alignment marks is equal to or greater than the limit value of the visual alignment, which is 6mm in this embodiment, and the distance between each set of alignment marks can also be set according to the configuration of the visual alignment system used, i.e. the limit value is not limited to 6 mm. The bonding area of the liquid crystal glass 10 comprises a PIN area 11 and a hollow PIN area 12, wherein the PIN area 11 is a conductive layer provided with an ITO coating, and the thickness of the hollow PIN area 12 is the same as that of the PIN area 11 and is 0.4-0.6 um. The ITO conductive glass is manufactured by plating a layer of indium tin oxide (commonly called ITO) film on the basis of sodium-calcium-based or silicon-boron-based substrate glass by a magnetron sputtering method. ITO is a metal compound with good transparent conductive performance, has the characteristics of forbidden bandwidth, high light transmittance in a visible light spectrum region, low resistivity and the like, is widely applied to the fields of flat panel display devices, solar cells, special function window coatings and other photoelectric devices, and is the only transparent conductive electrode material for various flat panel display devices such as LCDs, OLEDs, touch screens and the like at present. Generally, the ITO end of the liquid crystal glass of the liquid crystal display module needs to be bonded with the FPC, so as to realize the display function of the display screen. In this embodiment, the width of the PIN foot region 11 is less than 6mm, that is, less than the limit value of the visual alignment in this embodiment, the empty PIN region is divided into a first empty PIN region and a second empty PIN region, and the two empty PIN regions have the same width and are respectively disposed on two sides of the PIN foot region 11. When the bonding is fixed, two empty PIN regions with PIN foot region all bonds through ACF glue 40 and FPC20 together, and empty PIN region 12's setting makes liquid crystal glazing 10's bonding region not have the difference in height, has improved the bonding effect between liquid crystal glazing 10 and FPC20, has solved among the prior art liquid crystal glazing's bonding region and has formed the difference in height because of ITO thickness, leads to its PIN foot both sides and FPC bonding insecure, appears the bad phenomenon of bonding easily. It is worth mentioning that this empty PIN area is DUMMY, i.e. having only thickness but no PIN feet. When bonding operation is carried out, the alignment mark on the liquid crystal glass is accurately aligned by using the visual mechanism, ACF glue is coated between the two alignment marks, then the FPC is placed on the liquid crystal glass, the two groups of alignment marks are overlapped, and then the bonding is completed by hot pressing of a bonding machine.

In summary, the utility model provides a bonding structure of liquid crystal glass and FPC of a display screen, which includes that alignment marks are arranged on both FPC and liquid crystal glass, the alignment marks are larger than a limit value of visual alignment, and then a blank PIN area is arranged in a non-ITO area of a bonding area of the liquid crystal glass, so that the thicknesses of the blank PIN area and the ITO area are the same. And the design is ingenious, the operation is easy, and the method is worthy of vigorous popularization.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A bonding structure of liquid crystal glass and an FPC (flexible printed circuit) of a display screen is characterized by comprising the liquid crystal glass and the FPC which are bonded together, wherein alignment marks are correspondingly arranged at two ends of a bonding area of the liquid crystal glass and the FPC, and the two groups of alignment marks are overlapped after being bonded; the distance between each group of alignment marks is more than or equal to the limit value of visual alignment; the bonding area of the liquid crystal glass comprises a PIN foot area and an empty PIN area, and the thickness of the empty PIN area is the same as that of the PIN foot area.

2. A liquid crystal glass and FPC bonding structure of display screen according to claim 1, wherein said empty PIN area includes: the PIN foot region comprises a first empty PIN region and a second empty PIN region, the width of the first empty PIN region is the same as that of the second empty PIN region, and the first empty PIN region and the second empty PIN region are arranged on two sides of the PIN foot region.

3. A bonding structure of liquid crystal glass and FPC of display screen according to claim 1, characterized in that the limit value of visual alignment is 6 mm.

4. A bonding structure of liquid crystal glass and FPC of display screen according to claim 3, characterized in that, the width of PIN foot area is less than 6 mm.

5. A bonding structure of liquid crystal glass and FPC of display screen according to any of claims 1-4, characterized in that said liquid crystal glass and FPC are bonded together by ACF glue.

6. A bonding structure of liquid crystal glass and FPC of display screen according to claim 5, characterized in that, the thickness of said PIN foot area and said empty PIN area are both 0.4-0.6 um.