DE102019210036A1 - Display device with disc-shaped components - Google Patents

Abstract

The present invention relates to a display device (1) with two or more disc-shaped components (10, 12) as well as a method and a device for producing such a display device (1). At least a first disk-shaped component (10) and a second disk-shaped component (12) of the display device (1) are connected to one another by means of negative pressure. A separating seam between the first disk-shaped component (10) and the second disk-shaped component (12) is closed with an airtight seal (13).

Description

The present invention relates to a display device with disc-shaped components as well as a method and a device for producing such a display device.

In addition to the actual display panel, display devices generally have a cover glass which is arranged on the display panel. The display panel and the cover glass are usually firmly bonded to one another by means of an adhesive process, so that a visually clear, air gap-free connection is created. One example of such a bonding process is what is known as optical bonding.

In the case of touch-sensitive displays, e.g. based on LCD technology (LCD: Liquid Crystal Display), the integration of a touch sensor into the display device is also required. A distinction is made between different approaches to the implementation of the touch functionality.

In so-called in-cell solutions, the touch sensors are located in the display cells, e.g. in the LCD cells. In on-cell solutions, the touch sensor system consists of an array of electrodes that are attached to the top or bottom of the color filter substrate of the display panel. With out-cell solutions, a touch sensor is placed between the display panel and a cover glass. An overview of different implementations of the touch functionality is given in the article by G. Walker: "LCD In-Cell Touch" [ 1 ].

In the case of out-cell solutions, the touch sensor is currently firmly bonded to the display panel and the cover glass using an adhesive process.

With this in mind, describes US 2016/0282971 A1 an electronic device having a stackable assembly. The stack assembly comprises a stack of sub-assemblies, such as. B. a display for playing content, a front light, which is arranged on the display to illuminate the display, a capacitive touch sensor which is arranged on the front light to detect touch input, and a cover glass which is applied to the capacitive touch sensor . Each sub-assembly is bonded to another sub-assembly with an optically transparent adhesive film before the sub-assemblies are joined together. Gluing can be done using vacuum lamination.

The above-mentioned bonds between the various components of the display device can generally only be removed again with considerable effort. This often results in damage to the components. In addition, the individual parts obtained have to go through complex cleaning processes before they can possibly be fed back into the manufacturing process.

It is an object of the present invention to provide a display device in which there is a detachable connection between at least two disc-shaped components of the display device.

This object is achieved by a display device with the features of claim 1, by a method with the features of claim 8 and by a device with the features of claim 10. Preferred embodiments of the invention are the subject matter of the dependent claims.

A display device according to the invention has two or more disk-shaped components, with at least a first disk-shaped component and a second disk-shaped component being connected to one another by means of negative pressure, and wherein a separating seam between the first disk-shaped component and the second disk-shaped component is closed with an airtight seal.

• - Einbringen eines ersten scheibenförmigen Bauteils und eines zweiten scheibenförmigen Bauteils in eine Unterdruckkammer;
• - Fügen des ersten scheibenförmigen Bauteils und des zweiten scheibenförmigen Bauteils; und
• - Abdichten einer Trennnaht zwischen dem ersten scheibenförmigen Bauteil und dem zweiten scheibenförmigen Bauteil mit einer luftdichten Abdichtung.

According to a further aspect of the invention, a method for producing a display device with two or more disc-shaped components comprises the steps:

• Introducing a first disk-shaped component and a second disk-shaped component into a vacuum chamber;
• Joining the first disk-shaped component and the second disk-shaped component; and
• - Sealing a separating seam between the first disk-shaped component and the second disk-shaped component with an airtight seal.

• - eine Unterdruckkammer zum Aufnehmen eines ersten scheibenförmigen Bauteils und eines zweiten scheibenförmigen Bauteils;
• - eine Fügevorrichtung zum Fügen des ersten scheibenförmigen Bauteils und des zweiten scheibenförmigen Bauteils in der Unterdruckkammer; und
• - ein Werkzeug zum Abdichten einer Trennnaht zwischen dem ersten scheibenförmigen Bauteil und dem zweiten scheibenförmigen Bauteil mit einer luftdichten Abdichtung.

Accordingly, a device for producing a display device with two or more disc-shaped components has:

• a vacuum chamber for receiving a first disk-shaped component and a second disk-shaped component;
• - A joining device for joining the first disk-shaped component and the second disk-shaped component in the vacuum chamber; and
• a tool for sealing a separating seam between the first disk-shaped component and the second disk-shaped component with an airtight seal.

In the solution according to the invention, an adhesive connection between the disk-shaped components is dispensed with. Instead, the connection between the disc-shaped components is realized by means of adhesion. The components are joined under reduced pressure or in a vacuum and then sealed airtight around the separating seam. By deliberately breaking the seal and removing the negative pressure or the vacuum, the connection can be released again without leaving any residue. As a result of the releasability of the connection, the display device has an improved ability to rework or repair. This is an advantage in the event of field failures, production errors or component defects. By dispensing with an adhesive connection, negative effects which can lead to undesired optical effects due to the composition of the optically clear adhesive can also be avoided. Another advantage is that the overall height of the display device is reduced, which allows a flatter construction.

A display device according to the invention can be used in many areas, for example in the automotive sector, e.g. for a central display in the dashboard, or in the consumer sector, e.g. for smartphones or tablets. The solution described can be used particularly advantageously in combination with double or multi-display solutions, since it allows individual components to be exchanged without being destroyed.

According to one aspect of the invention, the disc-shaped components are a display panel, a touch sensor or a cover glass. These are those components that are typically glued in today's display devices, so that the solution according to the invention can be used for these components.

According to one aspect of the invention, at least one of the two or more disc-shaped components is subjected to a heating process before being introduced into the vacuum chamber. For example, the display panel can have a polarization filter that has been subjected to a heating process. Polarization filters are often made of plastic and can outgas over time, which could negatively affect the adhesive bond. The outgassing process can be greatly accelerated through the heating process, so that the outgassing rates are significantly reduced during the later period of use. In general, it is advisable to bake out all components involved that can outgas.

According to one aspect of the invention, the airtight seal is formed by an elastic adhesive or an elastic sealant. The use of an elastic adhesive or an elastic sealant has the advantage that it can be easily processed with a commercially available dosing system. In addition, the elastic seal reduces any stresses that may arise between the components.

According to one aspect of the invention, the elastic adhesive or the elastic sealant has a viscosity in the range from 100,000 mPa · s to 250,000 mPa · s. A viscosity in this range enables, on the one hand, good processability, but, on the other hand, also ensures a permanent seal. The stated viscosity is at 20 ° C.

According to one aspect of the invention, the elastic adhesive or the elastic sealant is polymer-based. The use of polymer-based adhesives or sealants has the advantage that they cover a very wide range of viscosities. The viscosity essentially depends on the chain length and its branching structure.

According to one aspect of the invention, the airtight seal is designed to stabilize the two or more disk-shaped components with one another. In this way, it is prevented that the interconnected components fall apart if the negative pressure decreases in the course of the service life of the display device.

Further features of the present invention will become apparent from the following description and the appended claims in conjunction with the figures.

• 1 zeigt einen Schnitt durch eine Anzeigevorrichtung gemäß dem Stand der Technik;
• 2 zeigt einen Schnitt durch eine erste Ausführungsform einer erfindungsgemäßen Anzeigevorrichtung;
• 3 zeigt einen Schnitt durch eine zweite Ausführungsform einer erfindungsgemäßen Anzeigevorrichtung;
• 4 zeigt einen Schnitt durch eine dritte Ausführungsform einer erfindungsgemäßen Anzeigevorrichtung;
• 5 zeigt schematisch ein Verfahren zum Herstellen einer erfindungsgemäßen Anzeigevorrichtung; und
• 6 zeigt schematisch eine Vorrichtung zum Herstellen einer erfindungsgemäßen Anzeigevorrichtung.

Figure overview

• 1 shows a section through a display device according to the prior art;
• 2 shows a section through a first embodiment of a display device according to the invention;
• 3 shows a section through a second embodiment of a display device according to the invention;
• 4th shows a section through a third embodiment of a display device according to the invention;
• 5 shows schematically a method for producing a display device according to the invention; and
• 6th shows schematically an apparatus for producing a display device according to the invention.

Figure description

For a better understanding of the principles of the present invention, embodiments of the invention are explained in more detail below with reference to the figures. The same reference symbols are used in the figures for elements that are the same or have the same effect and are not necessarily described again for each figure. It goes without saying that the invention is not restricted to the illustrated embodiments and that the features described can also be combined or modified without departing from the scope of protection of the invention as defined in the appended claims.

1 shows a section through a display device 1 according to the state of the art. The display device 1 includes a display panel 10 and a cover slip 12 . The display panel is by means of optical bonding 10 firmly adheres to the cover slip 12 glued. This is between the display panel 10 and the cover slip 12 an optically transparent adhesive film 15th arranged. The adhesive connection between the components is difficult to detach, so that when the components are separated, damage often occurs. This is particularly disadvantageous if one of the components is to be reworked or replaced for the purpose of repair. In addition, the individual parts obtained have to go through complex cleaning processes before they can possibly be fed back into the manufacturing process.

2 shows a section through a first embodiment of a display device according to the invention 1 . The display device 1 includes a display panel 10 and a cover slip 12 . The display panel 10 in this case, however, is not firmly adhered to the cover slip 12 optically bonded, but connected to it by means of an adhesive bond using negative pressure or vacuum. The seam between the display panel 10 and the cover slip 12 is all-round with an airtight seal 13 closed, which can be realized for example with an elastic adhesive or an elastic sealant. The waterproofing 13 can also have a stabilizing function. The adhesive or sealant is preferably polymer-based and has a viscosity in the range from 100,000 mPa · s to 250,000 mPa · s. For example, the seal can be achieved with the polymer sealant MS 930 from the manufacturer Henkel. This has a viscosity of 165,000 mPa · s at 20 ° C. and is already used in the automotive sector for installing windows.

3 shows a section through a second embodiment of a display device according to the invention 1 . The embodiment is largely identical to that in 2 illustrated embodiment. However, the display panel has 10 a polarizing filter 14th on that by means of negative pressure with the cover slip 12 connected is. The polarizing filter 14th , which is shown with a greatly increased thickness for better visibility, consists in this example of plastic and can therefore outgas, which could negatively affect the adhesive connection. In order to reduce the outgassing rate during the later period of use, the polarization filter was used 14th subjected to a baking process. The outgassing is greatly accelerated. The seam between the display panel 10 or the polarization filter 14th and the cover slip 12 is in turn all-round with an airtight seal 13 closed, which, as usual, can also have a stabilizing function.

4th shows a section through a third embodiment of a display device according to the invention 1 . In this embodiment, the display device 1 a touch sensor implemented in the form of an out-cell solution 11 on. Both the connection between the display panel 10 and the touch sensor 11 as well as the connection between the touch sensor 11 and the cover slip 12 are implemented as an adhesive connection in this example. For this purpose, the corresponding separating seams each have a circumferential airtight seal 13 on. Of course, one of the connections can also be realized by means of a conventional adhesive connection.

5 shows schematically a method for producing a display device with two or more disc-shaped components. If this is necessary, bakeout takes place first S1 at least one of the disk-shaped components. The disc-shaped components are then placed in a vacuum chamber S2 . The components are then joined under reduced pressure or in a vacuum S3 . Finally, a separating seam between the components is sealed with an airtight seal S4 . The seal can be implemented, for example, with an elastic adhesive or an elastic sealant. It can also have a stabilizing function. The adhesive or sealant is preferably polymer-based and has a viscosity in the range from 100,000 mPa.s to 250,000 mPa.s.

6th shows schematically an apparatus 20th for producing a display device with two or more disc-shaped components. The device 20th has a vacuum chamber 21st for receiving a first disk-shaped component and a second disk-shaped component. By means of a joining device 22nd the first disk-shaped component and the second disk-shaped component are in the vacuum chamber 21st joined. The Joining device 22nd can be implemented, for example, in the form of an assembly robot. With one tool 23 , eg a dosing system, is finally after evacuating the vacuum chamber 21st a separating seam between the first disk-shaped component and the second disk-shaped component is sealed circumferentially with an airtight seal. The seal is preferably implemented with an elastic adhesive or an elastic sealant, for example a polymer-based adhesive or sealant. It can also have a stabilizing function. The adhesive or sealant preferably has a viscosity in the range from 100,000 mPa · s to 250,000 mPa · s. The device 20th also has a control unit 24 on, through which the components of the device 20th to be controlled.

List of reference symbols

[1]

G. Walker: "LCD In-Cell Touch", Information Display Vol. 26 (2010), pages 8-14

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• US 2016/0282971 A1 [0006]

Non-patent literature cited

• G. Walker: "LCD In-Cell Touch", Information Display Vol. 26 (2010), pages 8-14 [0029]

Claims (10)

Display device (1) with two or more disk-shaped components (10, 11, 12), at least one first disk-shaped component (10) and a second disk-shaped component (12) being connected to one another by means of negative pressure, and wherein a separating seam between the first disk-shaped component (10) and the second disc-shaped component (12) is closed with an airtight seal (13). Display device (1) according to Claim 1 , with the disc-shaped components being a display panel (10), a touch sensor (11) or a cover glass (12). Display device (1) according to Claim 2 , wherein the display panel (10) has a polarization filter (14) which has been subjected to a heating process. Display device (1) according to one of the preceding claims, wherein the airtight seal (13) is formed by an elastic adhesive or an elastic sealant. Display device (1) according to Claim 4 , the elastic adhesive or the elastic sealant having a viscosity in the range from 100,000 mPa.s to 250,000 mPa.s. Display device (1) according to Claim 4 or 5 , wherein the elastic adhesive or the elastic sealant is polymer-based. Display device (1) according to one of the preceding claims, wherein the airtight seal (13) is set up to stabilize the two or more disc-shaped components (10, 11, 12) with one another. Method for producing a display device (1) with two or more disc-shaped components (10, 11, 12), comprising the steps: - Introducing (S2) a first disk-shaped component (10) and a second disk-shaped component (12) into a vacuum chamber (21); - Joining (S3) the first disk-shaped component (10) and the second disk-shaped component (12); and - Sealing (S4) a separating seam between the first disk-shaped component (10) and the second disk-shaped component (12) with an airtight seal (13). Procedure according to Claim 8 wherein at least one of the two or more disk-shaped components (10, 11, 12) is subjected to a heating process (S1) before being introduced (S2) into the vacuum chamber (21). Device for producing a display device (1) with two or more disc-shaped components (10, 11, 12), with: - A vacuum chamber (21) for receiving a first disk-shaped component (10) and a second disk-shaped component (12); - A joining device (22) for joining (S3) the first disk-shaped component (10) and the second disk-shaped component (12) in the vacuum chamber (21); and - A tool (23) for sealing (S4) a separating seam between the first disk-shaped component (10) and the second disk-shaped component (12) with an airtight seal (13).

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