KR20210121347A - Back cover of rollable display panel and method for manufacturing the same - Google Patents

Abstract

The present invention relates to a back cover of a rollable display panel and a manufacturing method thereof for preventing damage to a panel in a repeated operation where a display is rolled and spread and increasing manufacture efficiency compared to a conventional one and, more specifically, to a back cover of a rollable display panel and a manufacturing method thereof comprising: the back cover formed with a plurality of holes for the panel to be coupled to a front side; and a reinforcing material coupled to a rear side of the back cover to be filled in the hole and protruding more forward than the panel while surrounding peripheral parts at both ends of the back cover, respectively.

Description

BACK COVER OF ROLLABLE DISPLAY PANEL AND METHOD FOR MANUFACTURING THE SAME

The present invention relates to a rear cover of a rollable display panel and a method of manufacturing the same, and in particular, prevents the panel from being damaged in the process of repeated operation of a rolled and unfolded display, and improves manufacturing efficiency compared to the prior art. It relates to a cover and a method for manufacturing the same.

1 is a view showing a rear cover of a conventional rollable display panel, (a) of FIG. 1 is a view showing the back of the back cover, FIG. 1 (b) is a view showing the front of the back cover to which the panel is attached .

Rollable display devices are largely divided into inner/outer methods and top-down/bottom-up methods. They have a certain radius of curvature during rolling operation, and when they are dried and unfolded, they return to their original state to maintain flatness as a display. A cover structure having ductility while reinforcing rigidity at the back of the panel is required. For this purpose, as shown in FIG. 1, a metal material having a plate-shaped spring structure in which a plurality of holes is formed is applied.

However, in a panel structure in which a flat display panel is rolled and unfolded, the metal structures of the front and back cover of the panel come into contact with each other, and thus, damage to the panel surface is inevitable during repeated rolling operations. This is an unavoidable problem in both the inner method and the outer method and needs improvement.

In addition, when the panel is attached, there is a problem in that the flexible plastic panel sits down through the hole of the metal spring structure and hinders the flatness.

In order to solve this problem, liquid silicone was applied and then cured on the back side of the back cover, but a problem was raised that it takes a long time to work due to the solidification time of the liquid silicone. Also, after curing, there was a problem in that the panel was damaged due to friction with the front surface of the panel due to tacky, which is an inherent property of silicone during rolling operation. Moreover, since the metal on the left and right sides of the back cover is exposed to the outside when liquid silicone is used, scratches may occur due to the metal exposed during rolling, or safety issues for users have also been raised.

(0001) Domestic Registered Patent No. 10-1945985

The technical problem to be solved by the present invention is to provide a rear cover of a rollable display panel that prevents the display panel from coming into contact with the rear cover structure during rolling driving.

Another technical problem to be solved by the present invention is to provide a rear cover of a rollable display panel manufactured in a structure that surrounds the entire rear cover using an elastomer in order to prevent the metal exposure of the rear cover.

Another technical problem to be solved by the present invention is to provide a method for manufacturing a rear cover of a rollable display panel that has the above characteristics and improves manufacturing efficiency by reducing the number of work hours compared to the prior art.

The present invention for achieving the above technical problem relates to a back cover of a rollable display panel, the back cover having a plurality of holes formed in the front panel is coupled; and a reinforcing material that is filled in the hole while being coupled to the rear surface of the back cover, and is formed to protrude further forward than the panel while enclosing the periphery at both ends of the back cover.

In this case, the back cover is formed of at least one type of flexible metal material, and the reinforcing material is formed of at least one type of flexible synthetic resin material.

In addition, the reinforcing material is made of an elastomer, in particular, polyurethane (PU), ethylene vinyl acetate (EVA), polyolefin elastomer (POE), thermoplastic elastomer (TPE) and ionomer (Ionomer) series, such as a low melting point and sheet It is characterized in that it consists of a composition selected from the group that can be manufactured into a film.

In addition, the step difference between the reinforcing member and the panel protruding forward of the back cover is characterized in that it is composed of 0.1 ~ 1mm.

On the other hand, according to the present invention, the manufacturing method for the rear cover of the rollable display panel includes placing a grooved jig in response to the position and shape of the reinforcing material protruding forward while surrounding both ends of the back cover on the upper part of the lower press. A jig mounting step for seating; a back cover seating step of seating a back cover disc, which is manufactured to be larger than the standard of the back cover on the upper part of the jig, and has inflow holes corresponding to the positions of the plurality of holes and the grooves; a reinforcing material seating step of locating a reinforcing material on an upper portion of the back cover disc; a reinforcing material melting step in which the upper portion of the reinforcing material is brought into close contact with an upper press, and heat and pressure are applied to the upper press and the lower press to melt the reinforcing material; cooling step; and a cutting step of cutting the periphery of the back cover disk according to a predetermined standard.

In this case, the back cover is formed of at least one type of flexible metal material, and the reinforcing material is formed of at least one type of flexible synthetic resin material.

In addition, the reinforcing material is made of an elastomer, in particular, polyurethane (PU), ethylene vinyl acetate (EVA), polyolefin elastomer (POE), thermoplastic elastomer (TPE) and ionomer (Ionomer) series, such as a low melting point and sheet It is characterized in that it consists of a composition selected from the group that can be manufactured into a film.

In addition, the depth of the groove, characterized in that at least 0.1 ~ 1mm deeper than the thickness of the rollable display panel to be coupled to the lower portion of the back cover plate.

In addition, the heat applied to the upper press and the lower press is set in the range of 100 ~ 200 ℃, the pressure applied to the upper press and the lower press is characterized in that it is set in the range of 100 ~ 2,000 kPa.

In addition, the method further comprises: an inspection step of checking whether the molten reinforcing material fills the plurality of holes through the inlet hole and is normally introduced into the groove through the inlet hole and solidified.

The present invention described above has the following effects.

First, since the entire metal back cover is covered with an elastomer, it is possible to prevent the panel from being damaged due to the exposed metal part during rolling operation as the metal part is exposed as in the prior art, and to solve the user's stability problem.

In addition, it is possible to fundamentally solve the problem that the back cover itself comes into contact with the panel and the panel is damaged through the reinforcing material protruding more forward than the panel at both sides of the back cover.

In addition, the rear cover of the rollable display panel suitable for the rolling operation can be manufactured by configuring the rear cover of the rollable display panel itself with a flexible metal and synthetic resin material.

In addition, by configuring the reinforcing material of the elastomer material, it is possible to solve the problem of panel damage due to tacky when using liquid silicone in the prior art.

In addition, when using conventional liquid silicone, a three-step work process of lamination, screen printing, and curing is performed, but the present invention consists of a one-step work process of applying heat and pressure after lamination, thereby reducing work time and reducing manufacturing cost compared to the prior art. , can improve productivity.

In addition, by setting the step difference between the protruding part of the reinforcing material and the panel, and heat and pressure applied to the upper press and the lower press within the optimal range, product operation stability and productivity can be improved.

1 is a view showing a rear cover structure of a conventional rollable display panel;
2 is a conceptual view according to an embodiment of the structure of the rear cover of the rollable display panel according to the present invention;
3 is a view showing in more detail a configuration state according to an embodiment of the rear cover structure of the rollable display panel according to the present invention;
4 is a process diagram according to an embodiment of a method for manufacturing a rear cover of a rollable display panel according to the present invention;
5 is a conceptual diagram illustrating a state in which heat and pressure are applied after lamination according to an embodiment of a method for manufacturing a rear cover of a rollable display panel according to the present invention;
6 is a view showing a cutting state according to an embodiment of the method for manufacturing the rear cover of the rollable display panel according to the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. In adding reference numerals to the components of each drawing, it should be noted that the same components are given the same reference numerals as much as possible even though they are indicated on different drawings. In addition, in describing the embodiment of the present invention, if it is determined that a detailed description of a related known configuration or function interferes with the understanding of the embodiment of the present invention, the detailed description thereof will be omitted.

In addition, in describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only for distinguishing the components from other components, and the essence, order, or order of the components are not limited by the terms. When it is described that a component is “connected”, “coupled” or “connected” to another component, the component may be directly connected or connected to the other component, but another component is between each component. It will be understood that may also be "connected", "coupled" or "connected".

2 is a conceptual diagram according to an embodiment of the structure of the rear cover of the rollable display panel according to the present invention. FIG. is a front view of (a), and FIG. 3 is a view showing in more detail a configuration state according to an embodiment of the rear cover structure of the rollable display panel according to the present invention.

The structure of the rear cover of the rollable display panel according to the present invention will be described with reference to FIGS. 2 and 3 .

Since the operation structure and state of use of the rollable display panel are known technologies, it is determined that there is a risk of obscuring the gist of the present invention, and thus detailed description thereof will be omitted.

The rear cover structure of the rollable display panel according to the present invention includes a back cover 10 and a reinforcing material 20 .

Since the panel 1 is coupled to the front surface of the back cover 10 and rolled together, the back cover 10 is formed of a flexible metal material and may be made of one or more metals. The back cover 10 may also be understood as a plate-shaped spring in which a plurality of holes 11 are formed, and a rolling operation is possible with the configuration of the holes 11 . Structures (not shown) necessary for the rollable display panel are installed or coupled to the upper and lower portions of the back cover 10 . Since the back cover 10 is made of metal, the panel 1 in contact with the back cover 10 may be damaged during a rolling operation with the panel 1 coupled thereto. Accordingly, the reinforcing material 20 is further coupled.

The reinforcing material 20 fills the plurality of holes 11 formed in the back cover 10 while being coupled to the rear surface of the back cover 10 . At the same time, both ends of the back cover 10 are formed to protrude further forward than the panel 1 coupled to the front while enclosing the circumference of the back cover 10, respectively.

That is, the present invention has a structure in which the reinforcing material 20 fills the plurality of holes 11 formed in the back cover 10 of the plate-like spring structure and the reinforcing material 20 surrounds the entire back cover 10, so the metal back cover The panel 1 and the back are prevented from being exposed to the outside, as well as by implementing the molding parts 21 protruding forward in the shape of a pair of left and right lanes on both sides of the back cover 10 . When the cover 10 is rolled, the panel 1 and the molding part 21 are rolled in a state spaced apart by a step from each other, so that the panel 1 can be fundamentally blocked from coming into direct contact with the back cover 10 .

For this purpose, the step difference between the molding part 21 protruding forward of the back cover 10 and the panel 1 is preferably 0.1 to 1 mm, as shown in FIG. 3 . At this time, when the step difference between the molding unit 21 and the panel 1 is less than 0.1 mm, the back cover 10 may come into contact with the upper surface of the panel 1 during the rolling process and friction may occur. At the time of construction, the overall thickness of the rolling panel device is thickened, so that the radius of curvature (outer standard) only increases, but rather inhibits the rolling operation.

On the other hand, although the shape of the molding part 21 is not limited, it is preferable to form a round shape in order to minimize damage to the panel 1 when in contact with the panel 1 .

The reinforcing material 20 is composed of a soft synthetic resin material, and this may also be composed of one or more types. The reinforcing material 20 may be composed of a high elastic elastomer, among the elastomers, polyurethane (PU: Polyurethane), ethylene-vinyl acetate (EVA: Ethylene-Vinyl Acetate), polyolefin elastomer (POE: Polyolefin Elastomer), and thermoplastic elastomer (TPE: Thermoplastic Elastomer) and an ionomer made by crosslinking metal ions to an ethylene methacrylic acid copolymer has a low melting point, such as a series, and is preferably composed of a composition selected from the group that can be manufactured into a sheet or film.

The operating state of the present invention described above will be described as follows.

First, in the rear cover of the rollable display panel according to the present invention, the molding parts 21 are formed to protrude in the front direction of both sides of the back cover 10 while the reinforcing material 20 surrounds the entire back cover 10, The panel 1 is coupled between the portions 21 , and the above-described step is formed between the molding portion 21 protruding forward and the panel 1 .

Accordingly, since the molding parts 21 are formed on both sides of the panel 1 , the molding parts 21 come into contact with the panel 1 when rolling. That is, when rolling, the panel 1 is in direct contact with the back cover 10 because the metal back cover 10 and the panel 1 are rolled apart by the step difference between the molding part 21 and the panel 1 . is prevented from becoming In addition, since the entire back cover 10 is surrounded by the reinforcing material 20 , the sharp part of the back cover 10 is not exposed to the outside, thereby ensuring the safety of the operator.

4 is a process diagram according to an embodiment of a method for manufacturing a rear cover of a rollable display panel according to the present invention, and FIG. 5 is a conceptual diagram showing a state of applying heat and pressure after lamination according to the method for manufacturing a rear cover of a rollable display panel according to the present invention. , FIG. 6 is a view showing a cutting state according to an embodiment of a method for manufacturing a rear cover of a rollable display panel according to the present invention.

A method of manufacturing the rear cover of the aforementioned rollable display panel will be described with reference to FIGS. 4 to 6 .

The method for manufacturing the back cover of the rollable display panel of the present invention (hereinafter referred to as 'back cover manufacturing method') includes the jig mounting step (S10), the back cover mounting step (S20), the reinforcing material mounting step (S30), the reinforcing material melting step. (S40), a cooling step (S50), and a cutting step (S60), and may further include an inspection step (S70).

According to the method of manufacturing the back cover of the present invention, the jig 30, the back cover disk 40 and the reinforcing material 20 are laminated between the upper press 50 and the lower press 60, and then heat and pressure are applied to the reinforcing material 20. By melting the molten reinforcing material 20, while filling the plurality of holes 11 formed in the back cover 10, the entire back cover 10 is wrapped and molded into a structure that protrudes forward from both sides of the back cover 10 do.

The jig seating step (S10) is a step of seating and supporting the jig 30 on the upper part of the lower press 60, and a guide frame (not shown) for seating and supporting the jig 30 on the lower press 60 is configured or , may be formed in a structure for coupling the jig 30 to the lower press 60, or may have a structure in which the lower press 60 and the jig 30 are integrally formed. When the jig 30 is mounted on the lower press 60, the mounting operation may be automatically performed by a separate jig mounting device. A lane-shaped groove 31 is formed in the jig 30 to correspond to the position and shape of the molding part 21 protruding forward while enclosing both ends of the back cover 10 . The groove 31 formed in the jig 30 determines the shape and the front protrusion length of the molding part 21, there is no problem in the shape processing of the groove 31, and the back cover surrounded by the reinforcing material 20 after processing ( 10) If there is no problem when separating the jig 30, it is not preferable to limit the shape of the groove 31. For example, the groove 31 may have a square shape or a rounded shape. Accordingly, the depth of the groove 31 is preferably formed to be at least 0.1 to 1 mm deeper than the thickness and length of the rollable display panel 1 to be coupled to the lower portion (refer to FIG. 5 ) of the back cover 10 after manufacturing. Here, the thickness and length of the rollable display panel 1 may be understood as the sum of the thicknesses of the panel 1 and the panel adhesive 2 for attaching the panel 1 . On the other hand, since the jig 30 has to withstand heat and pressure during the manufacturing process, it is preferable to be made of a metal material that is not deformed even by applied heat and pressure.

The back cover seating step (S20) is a step of stacking the back cover disk 40 on the top of the jig 30 described above. The back cover disk 40 is larger than the standard of the back cover 10 to be manufactured, and the inlet hole 41 is formed corresponding to the positions of the plurality of holes 11 and the grooves 31 formed in the jig 30 . The molten reinforcing material 20 is introduced into the groove 31 formed in the jig 30 through the inlet hole 41 . Accordingly, when the back cover disk 40 is stacked on the top of the jig 30 , the inlet hole 41 is positioned in the vertical upper portion of the groove 31 . The back cover disk 40 may be automatically stacked on the top of the jig 30 by the back cover supply device.

In the reinforcing material seating step ( S30 ), the sheet-shaped reinforcing material 20 may be automatically supplied and laminated on the upper portion of the back cover original plate 40 by a separate reinforcing material supply device. The thickness and size of the reinforcing material 20 may be determined in consideration of the protrusion length and thickness of the molding unit 21 together with the thickness and size of the back cover 10 .

The structure and material of the back cover 10 and the reinforcing material 20 may be referred to together with the description of the back cover of the rollable display panel.

In the reinforcing material melting step (S40), the upper press 50 that is lifted by the conveying device is moved to the lower portion to be in close contact with the upper portion of the reinforcing material 20, and heat is applied to the upper press 50 and the lower press 60 as shown in FIG. The reinforcing material 20 is melted by applying pressure. The molten reinforcing material 20 fills the plurality of holes 11 formed in the back cover original plate 40 and at the same time flows into the groove 31 through the inflow hole 41, surrounds the entire back cover 10, and forms a molding part ( 21) is formed. Although not shown in detail, the inlet hole 41 may be formed in the form of a long hole to correspond to the longitudinal direction in which the molding part 21 is formed. Meanwhile, a polymer film may be additionally configured as needed in the laminated structure.

At this time, the heat applied to the upper press 50 and the lower press 60 to melt the reinforcing material 20 is set in the range of 100 ~ 200 ℃, preferably set in the range of 120 ~ 180 ℃. When the reinforcing material 20 is made of an elastomer, the elastomer is incompletely melted at a temperature of less than 100° C., so the flowability is insufficient, and the molding part 21 of both sides of the back cover 10 is not smoothly implemented. In addition, if it exceeds 200 ℃, it may affect the polymer film or sheet material, so it is not suitable in terms of expandability.

The pressure applied to the upper press 50 and the lower press 60 is set in the range of 100 ~ 2,000 kPa. At less than 100 kPa, since the reinforcing material 20 made of the molten elastomer material cannot fill the plurality of holes 11 formed in the back cover disk 40, the reinforcing material 20 is placed on the upper portion of the back cover disk 40 (based on FIG. 5). ) may remain with non-uniform thickness. In addition, when it exceeds 2,000 kPa, damage may occur to the jig 30 and the upper/lower presses 50 and 60 due to the metal of the back cover original plate 40, so it is not suitable for a continuous process.

After applying heat and pressure for the set time as described above, the applied heat and pressure are released, the upper press 50 is moved to the upper part, and the cooling step (S50) of re-solidifying the molten reinforcing material 20 into a solid phase is performed. At this time, in the case of conventionally used liquid silicone, it must be cured for a long time using an infrared lamp in the cooling (solidification) step, but in the case of the elastomer applied to the present invention, the solidification rate is faster than that of the conventionally used liquid silicone, so the manufacturing process The time is greatly reduced, so the product production efficiency can be improved. In addition, in the prior art, due to tacky, which is an intrinsic property of silicone, a problem of damage to the panel 1 occurred as the front surface of the back cover 10 and the panel 1 came into contact with the back cover 10 during rolling operation. This can be addressed by using a tacky-less elastomeric material. The cooling step ( S50 ) may be performed by natural cooling or through a separate cooling device.

When the cooling step (S50) is completed, the periphery of the back cover disk 40 is cut to meet the prescribed standard as shown in FIG. 6 through the cutting step (S60). At this time, since the reinforcing material 20 is coupled to the back cover disc 40, the periphery of the back cover disc 40 can be understood as the circumferential part including the reinforcing member 20 in the state in which the reinforcing member 20 is coupled. That is, only the back cover 10 in which the molding part 21 is formed is left while being surrounded by the reinforcing material 20 through the cutting step S60. The cutting step S60 is the reinforcing material 20 by an operator or a transfer device. ) can be performed by separating the back cover disk 40 in the coupled state from the jig 30 and transferring it to a cutting device.

After the cutting is completed, the molten reinforcing material 20 fills the plurality of holes 11 formed in the back cover 10 through the inlet hole 41 and is normally introduced into the groove 31 through the inlet hole 41 for molding. It is checked whether the unit 21 is solidified in the configured state, and defective products can be selected.

By using the back cover of the rollable display panel according to the present invention described above, the panel 1 and the back cover 10 are prevented from directly contacting even during repeated rolling driving, thereby preventing the panel 1 from being damaged. Also, since the entire back cover 10 made of a metal material is covered with the reinforcing material 20, the back cover 10 is not exposed to the outside, thereby ensuring the user's stability.

In addition, since it proceeds with a simple operation procedure compared to the conventional process using liquid silicon, it is possible to reduce the number of work hours, shorten the working time, reduce the production cost, and improve the production efficiency.

In the above, even though it has been described that all components constituting the embodiment of the present invention operate as one combined or combined, the present invention is not necessarily limited to this embodiment. That is, within the scope of the object of the present invention, all the components may operate by selectively combining one or more. In addition, terms such as "comprises", "comprises" or "have" described above mean that the corresponding component may be inherent, unless otherwise stated, excluding other components. Rather, it should be construed as being able to further include other components. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs, unless otherwise defined. Commonly used terms such as terms defined in the dictionary should be interpreted as being consistent with the contextual meaning of the related art, and are not interpreted in an ideal or excessively formal meaning unless explicitly defined in the present invention.

The above description is merely illustrative of the technical spirit of the present invention, and various modifications and variations will be possible without departing from the essential characteristics of the present invention by those skilled in the art to which the present invention pertains. Accordingly, the embodiments disclosed in the present invention are for explanation rather than limiting the technical spirit of the present invention, and the scope of the technical spirit of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed by the following claims, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

1: panel 2: adhesive for panel
10: back cover 11: hole
20: reinforcing material 21: molding part
30: jig 31: home
40: back cover original plate 41: inlet hole
50: upper press 60: lower press
S10: Jig seating step S20: Back cover seating step
S30: Reinforcing material seating step S40: Reinforcing material melting step
S50: cooling step S60: cutting step
S70: Inspection step

Claims (14)

It relates to a back cover of a rollable display panel,
a back cover in which a plurality of holes are formed and the panel is coupled to the front surface; and
A back cover of a rollable display panel comprising a; reinforcing material that is filled in the hole while being coupled to the rear surface of the back cover, and is formed to protrude more forward than the panel while enclosing the periphery at both ends of the back cover. According to claim 1,
The back cover is
A rear cover of a rollable display panel formed of a flexible metal material composed of at least one type. According to claim 1,
The reinforcement is
A rear cover of a rollable display panel formed of a flexible synthetic resin material composed of at least one type. 4. The method of claim 3,
The reinforcement is
A back cover of a rollable display panel made of elastomer. 5. The method of claim 4,
The reinforcement is
Polyurethane (PU), ethylene vinyl acetate (EVA), polyolefin elastomer (POE), thermoplastic elastomer (TPE) and ionomer (Ionomer) series, such as low melting point, consisting of a composition selected from the group that can be manufactured into a sheet or film The back cover of the rollable display panel. 6. The method according to any one of claims 1 to 5,
The rear cover of the rollable display panel is configured to have a step difference of 0.1 to 1 mm between the reinforcing material and the panel protruding forward of the back cover. It relates to a method for manufacturing a rear cover of the rollable display panel according to claim 1,
a jig seating step of seating the grooved jig on the upper part of the lower press in response to the position and shape of the reinforcing material protruding forward while enclosing both ends of the back cover;
a back cover mounting step of seating a back cover disc, which is manufactured to be larger than the standard of the back cover on the upper part of the jig, and has inflow holes corresponding to the positions of the plurality of holes and the grooves;
a reinforcing material seating step of locating a reinforcing material on an upper portion of the back cover disc;
a reinforcing material melting step in which the upper portion of the reinforcing material is brought into close contact with an upper press, and heat and pressure are applied to the upper press and the lower press to melt the reinforcing material;
cooling step; and
A method of manufacturing a back cover of a rollable display panel comprising a; a cutting step of cutting the circumference of the back cover disk to meet a predetermined standard. 8. The method of claim 7,
The back cover is
A method for manufacturing a rear cover of a rollable display panel formed of a flexible metal material composed of at least one type. 8. The method of claim 7,
The reinforcement is
A method of manufacturing a back cover of a rollable display panel formed of at least one kind of flexible synthetic resin material. 10. The method of claim 9,
The reinforcement is
A method for manufacturing the back cover of a rollable display panel made of elastomer. 11. The method of claim 10,
The reinforcement is
Polyurethane (PU), ethylene vinyl acetate (EVA), polyolefin elastomer (POE), thermoplastic elastomer (TPE) and ionomer (Ionomer) series, such as low melting point, consisting of a composition selected from the group that can be manufactured into a sheet or film A method of manufacturing the back cover of a rollable display panel. 8. The method of claim 7,
The depth of the groove is
A method of manufacturing a rear cover of a rollable display panel formed to be at least 0.1 to 1 mm deeper than the thickness and length of the rollable display panel to be coupled to the lower portion of the back cover original plate. 8. The method of claim 7,
The heat applied to the upper press and the lower press is
A method for manufacturing the back cover of a rollable display panel set in the range of 100 ~ 200℃. 8. The method of claim 7,
The pressure applied to the upper press and the lower press is
A method of manufacturing the back cover of a rollable display panel set in the range of 100 ~ 2,000 kPa.

Images