KR102496467B1 - Flexible display device - Google Patents

Abstract

A display device according to the present invention includes a display panel, a protective film, and a cover layer. The display panel includes a first flat portion, a second flat portion, and a curved portion bent to have a predetermined curvature between the first flat portion and the second flat portion. The protective film is disposed on the display panel in the first flat portion. The cover layer is disposed on the display panel to cover the curved portion. When at least one part of the side surface of the protective film adjacent to the cover layer is a straight line, the angle between the straight line and the upper surface of the protective film is an acute angle, and at least one part of the side surface of the protective film adjacent to the cover layer is curved. A hot angle formed by a tangent to a point on the curve and the upper surface of the protective film is an acute angle.

Description

Flexible display device {FLEXIBLE DISPLAY DEVICE}

The present invention relates to a flexible display device.

As information technology develops, the market for display devices, which are communication media between users and information, is growing. Accordingly, the use of display devices such as an organic light emitting display (OLED), a liquid crystal display (LCD), and a plasma display panel (PDP) is increasing.

Among them, since an organic light emitting diode display device is a self-light emitting device, it consumes less power and can be manufactured thinner than a liquid crystal display device requiring a backlight. In addition, the organic light emitting diode display has a wide viewing angle and a fast response speed. The organic light emitting diode display is expanding its market while competing with liquid crystal displays as the process technology has been developed to the level of large-screen mass production technology.

The pixels of the organic light emitting diode display device include organic light emitting diodes (hereinafter referred to as “OLEDs”) which are self-light emitting elements. Organic light emitting diode display devices may be classified in various ways according to a type of light emitting material, a light emitting method, a light emitting structure, a driving method, and the like. Organic light emitting diode display devices can be divided into fluorescent light emitting and phosphorescent light emitting according to light emitting methods, and can be divided into top emission structures and bottom emission structures according to light emitting structures. In addition, the organic light emitting diode display may be divided into a PMOLED (Passive Matrix OLED) and AMOLED (Active Matrix OLED) according to a driving method.

Recently, with the commercialization of flexible display devices, various types of display devices are being developed. The flexible display device may be implemented in various forms such as a bendable display device, a foldable display device, a rollable display device, and a curved display device. Such a flexible display device can be applied not only to mobile devices such as smart phones and tablet PCs, but also to TVs (Televisions), automobile displays, and wearable devices, and its application fields are expanding.

An object of the present invention is to provide a display device that secures product yield and product stability by changing the shape of the protective film.

A display device according to the present invention includes a display panel, a protective film, and a cover layer. The display panel includes a first flat portion, a second flat portion, and a curved portion bent to have a predetermined curvature between the first flat portion and the second flat portion. The protective film is disposed on the display panel in the first flat portion. The cover layer is disposed on the display panel to cover the curved portion. When at least one part of the side surface of the protective film adjacent to the cover layer is a straight line, the angle between the straight line and the upper surface of the protective film is an acute angle, and at least one part of the side surface of the protective film adjacent to the cover layer is curved. A hot angle formed by a tangent to a point on the curve and the upper surface of the protective film is an acute angle.

In the present invention, by including a protective film of a new type different from the prior art, the cover layer can be controlled so that it does not extend to the upper surface of the protective film. Accordingly, the present invention can prevent foreign matter and adhesive residue from remaining on the upper surface of the protective film, and can easily remove the release film previously attached to the upper surface of the protective film, thereby improving product yield, product reliability, And it is possible to provide a display device with improved product stability.

1 is a schematic block diagram of an organic light emitting display device.
2 is a first exemplary diagram illustrating a circuit configuration of a sub-pixel.
3 is a second exemplary diagram illustrating a circuit configuration of a sub-pixel.
4 and 5 are perspective views illustrating an organic light emitting display device.
6 and 7 are cross-sectional views illustrating an organic light emitting display device according to an exemplary embodiment of the present invention.
8 to 10 are diagrams for explaining problems that may occur as a cover layer is formed.
11 is a cross-sectional view showing the shape of a protective film according to an embodiment of the present invention.
12 is a cross-sectional view illustrating an organic light emitting display device including a protective film according to an exemplary embodiment of the present invention.
13 is a cross-sectional view illustrating an organic light emitting display device including a protective film according to another exemplary embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. Like reference numbers throughout the specification indicate substantially the same elements. In the following description, if it is determined that a detailed description of a known technology or configuration related to the present invention may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. In addition, component names used in the following description may be selected in consideration of ease of writing specifications, and may be different from names of parts of actual products. In describing various embodiments, substantially the same components are representatively described at the beginning and may be omitted in other embodiments.

Terms including ordinal numbers, such as first and second, may be used to describe various components, but the components are not limited by the terms. These terms are only used for the purpose of distinguishing one component from another. Singular expressions include plural expressions unless the context clearly dictates otherwise.

The display device according to the present invention includes a liquid crystal display (LCD), a field emission display (FED), a plasma display panel (PDP), and an organic light emitting diode display (Organic Light Emitting Display, OLED Display), electrophoresis display device (Electrophoresis, EPD), etc. may be implemented as a display device. Hereinafter, for convenience of explanation, a case in which a display device includes an organic light emitting diode element will be described as an example.

An organic light emitting display device includes a light emitting layer made of an organic material between a first electrode serving as an anode and a second electrode serving as a cathode. Therefore, holes supplied from the first electrode and electrons supplied from the second electrode are combined in the light emitting layer to form an exciton, which is a hole-electron pair, and emits light by energy generated as the exciton returns to the ground state. It is a light emitting display device.

1 is a schematic block diagram of an organic light emitting display device. 2 is a first exemplary diagram illustrating a circuit configuration of a sub-pixel. 3 is a second exemplary diagram illustrating a circuit configuration of a sub-pixel. 4 and 5 are perspective views illustrating an organic light emitting display device.

Referring to FIG. 1 , the organic light emitting display device includes an image processor 10, a timing controller 20, a data driver 30, a gate driver 40, and a display panel PNL.

The image processor 10 outputs a data enable signal DE along with the data signal DATA supplied from the outside. The image processor 10 may output one or more of a vertical sync signal, a horizontal sync signal, and a clock signal in addition to the data enable signal DE, but these signals are omitted for convenience of description. The image processing unit 10 is formed in the form of an integrated circuit (IC) on a system circuit board.

The timing controller 20 receives a data signal DATA along with a data enable signal DE or driving signals including a vertical synchronization signal, a horizontal synchronization signal, and a clock signal from the image processing unit 10 .

The timing controller 20 generates a gate timing control signal (GDC) for controlling the operation timing of the gate driver 40 and a data timing control signal (DDC) for controlling the operation timing of the data driver 30 based on the driving signal. outputs The timing controller 20 is formed in the form of an IC on a control circuit board.

The data driver 30 samples and latches the data signal DATA supplied from the timing controller 20 in response to the data timing control signal DDC supplied from the timing controller 20, converts it into a gamma reference voltage, and outputs the result. . The data driver 30 outputs the data signal DATA through the data lines DL1 to DLn. The data driver 30 is attached in the form of an IC on a substrate.

The gate driver 40 outputs a gate signal while shifting the level of a gate voltage in response to the gate timing control signal GDC supplied from the timing controller 20 . The gate driver 40 outputs a gate signal through the gate lines GL1 to GLm. The gate driver 40 is formed in the form of an IC on a gate circuit board or formed in a gate-in-panel method on the display panel PNL.

The display panel PNL displays an image in response to the data signal DATA and the gate signal supplied from the data driver 30 and the gate driver 40 . The display panel PNL includes subpixels SP displaying an image.

Referring to FIG. 2 , one sub-pixel includes a switching transistor (SW), a driving transistor (DR), a compensation circuit (CC), and an organic light emitting diode (OLED). The organic light emitting diode (OLED) operates to emit light according to a driving current formed by the driving transistor DR.

The switching transistor SW performs a switching operation to store the data signal supplied through the first data line DL1 as a data voltage in the capacitor in response to the gate signal supplied through the first gate line GL1. The driving transistor DR operates to allow a driving current to flow between the high potential power line VDD and the low potential power line GND according to the data voltage stored in the capacitor. The compensation circuit CC is a circuit for compensating for the threshold voltage of the driving transistor DR. Also, a capacitor connected to the switching transistor SW or the driving transistor DR may be located inside the compensation circuit CC.

The compensation circuit (CC) is composed of one or more thin film transistors and capacitors. Since the configuration of the compensation circuit (CC) varies greatly depending on the compensation method, specific examples and descriptions thereof will be omitted.

In addition, as shown in FIG. 3 , when the compensation circuit CC is included, the sub-pixel further includes a signal line and a power supply line for supplying a specific signal or power as well as driving the compensation thin film transistor. The added signal line may be defined as a first-second gate line GL1b for driving a compensation thin film transistor included in a subpixel. Also, the added power line may be defined as an initialization power line (INIT) for initializing a specific node of a subpixel to a specific voltage. However, this is only one example and is not limited thereto.

On the other hand, in FIGS. 2 and 3, it is taken as an example that a compensation circuit (CC) is included in one sub-pixel. However, when the subject of compensation is located outside the sub-pixel, such as the data driver 30, the compensation circuit CC may be omitted. That is, one subpixel is basically composed of a 2T (Transistor) 1C (Capacitor) structure including a switching transistor (SW), a driving transistor (DR), a capacitor, and an organic light emitting diode (OLED), but a compensation circuit (CC) When is added, it may be configured in various ways such as 3T1C, 4T2C, 5T2C, 6T2C, and 7T2C.

2 and 3 show that the compensation circuit CC is located between the switching transistor SW and the driving transistor DR, it may be further located between the driving transistor DR and the organic light emitting diode OLED. may be The position and structure of the compensation circuit (CC) is not limited to FIGS. 2 and 3 .

Referring to FIG. 4 , the organic light emitting display device includes a substrate SUB and a circuit element LF.

The substrate SUB includes a display area AA and a pad portion PA defined outside the display area AA. A plurality of subpixels are disposed in the display area AA. The subpixels are arranged in a red (R), green (G), blue (B), or white (R, G, B, and W) manner in the display area AA to implement full color. A subpixel may be partitioned by a gate line and a data line crossing each other.

The circuit element LF includes bumps (or terminals). The bumps of the circuit element LF may be respectively bonded to the pads of the pad part PA through an anisotropic conductive film. The circuit element LF may be a chip on film (COF) in which a driving IC (Integrated Circuit) is mounted on a flexible film. Also, the circuit element LF may be implemented as a COG type that is directly bonded to pads on a substrate through a chip on glass process. Also, the circuit element LF may be a flexible circuit such as a flexible flat cable (FFC) or a flexible printed circuit (FPC). In the following embodiments, a chip-on-film will be described as an example of the circuit element LF, but the present invention is not limited thereto.

Driving signals, eg, gate signals and data signals, supplied through the circuit element LF, are supplied to the gate line and data lines of the display area AA through the routing lines RL.

In the organic light emitting display device, a sufficient space in which the pad part PA and the circuit element LF, etc. may be located should be secured in addition to the display area AA where the input image is implemented. This space corresponds to a bezel area, and the bezel area is recognized by a user positioned in front of the organic light emitting display device, and becomes a factor in deteriorating aesthetics.

Referring to FIG. 5 , in the organic light emitting display device, one edge of the substrate SUB is bent in the rear direction to have a predetermined curvature. One edge of the substrate SUB corresponds to an outer side of the display area AA and may correspond to an area where the pad part PA is located. As the substrate SUB is bent, the pad part PA may be positioned to overlap the display area AA in the rear direction of the display area AA. Accordingly, the bezel area perceived from the front of the organic light emitting display device can be minimized.

To implement this, the substrate SUB may be made of a flexible material capable of being bent. For example, the substrate SUB may be formed of a plastic material such as polyimide (PI). Also, the routing line RL may be made of a flexible material. For example, the routing line RL may be formed of a material such as a metal nano wire, a metal mesh, or a carbon nanotube (CNT). However, it is not limited thereto.

Meanwhile, the routing lines RL extend from the display area AA and are disposed in the bending area. That is, the routing line RL extends along the outer periphery of the substrate SUB in the bending area. Since the routing lines RL are positioned in a bent region to have a predetermined curvature, they are easily cracked or opened due to stress acting during bending.

More specifically, when one edge of the substrate SUB is bent, a neutral plane is located on the substrate SUB in the bending region. The neutral plane (NP) is a surface in which the stress state becomes 0 during bending, and means a surface that is bent while maintaining its original length without extending or contracting when a bending moment is applied. During bending, compressive stress acts on the inside of the bending curvature and tensile stress acts on the outside. Cracks are more likely to occur than elements arranged in That is, the elements are more susceptible to cracking when subjected to tensile stress than when subjected to compressive stress during bending. In a structure in which the edge of the substrate SUB is bent, since the routing lines RL receive tensile stress during bending, defects such as cracks are likely to occur in the bending area.

Hereinafter, an organic light emitting display device according to an exemplary embodiment of the present invention will be described in detail with reference to FIGS. 6 and 7 . 6 and 7 are cross-sectional views illustrating an organic light emitting display device according to an exemplary embodiment of the present invention.

Referring to FIGS. 6 and 7 , the organic light emitting display device according to the exemplary embodiment includes a display panel PNL, a circuit element LF, a protective film PF, and a cover layer CL.

The display panel PNL includes a first flat part FP1, a second flat part FP2, and a curved part BP positioned between the first flat part FP1 and the second flat part FP2. The first flat part FP1 corresponds to a display area having a plurality of subpixels and is an area that maintains a flat state. The second flat portion FP2 corresponds to a pad portion having pads bonded to the circuit element LF, and is a region maintaining a flat state. The curved portion BP corresponds to an area provided with routing lines connecting the display area and the pad portion, and is an area maintained in a bent state with a predetermined curvature.

For example, the curved portion BP may have a “⊃” shape. That is, the curved portion BP may extend from the first flat portion FP1 and be bent by 180 degrees in the rear direction, and thus, the second flat portion FP2 extending from the curved portion BP may be bent by 180 degrees in the rear direction. It may be positioned to overlap the first planar portion FP1 in the rear direction of the portion FP1. That is, the circuit element LF bonded to the display panel PNL on the second flat portion FP2 may be positioned in the rear direction of the display panel PNL on the first flat portion FP1.

The protective film PF is positioned on the uppermost layer of the organic light emitting display device. The protective film PF may be a layer directly contacting the cover glass. The cover glass is provided to cover the front surface of the organic light emitting display and serves to protect the organic light emitting display. The protective film PF is disposed on the display panel PNL of the first flat portion FP1 to protect the display panel PNL and perform a predetermined function of assisting or improving the function of the display panel PNL. can do.

The protective film PF may be an optical film such as a polarizing film. The polarizing film may improve visibility by reducing reflection of light incident from the outside. For example, the polarizing film transmits only light vibrating in the same direction as the polarization axis and absorbs or reflects light vibrating in other directions to transmit only light emitted from the display device.

The cover layer CL is positioned on the curved portion BP of the display panel PNL. The cover layer CL may be made of an adhesive resin. The cover layer CL may be formed to have a sufficient area to cover the curved portion BP.

The organic light emitting display device according to the exemplary embodiment of the present invention may further include a cover layer CL to control the position of the neutral plane. For example, in the organic light emitting display device according to an embodiment of the present invention, the routing line may be located in a region where a tensile stress is applied or a neutral plane is located on a routing line by adjusting the thickness of the cover layer CL. The position of the neutral plane can be controlled so that

In addition, the cover layer CL may serve to protect a routing line exposed to the outside by being disposed on the substrate of the curved portion BP from external impact. For example, the cover layer CL may prevent direct friction between the routing lines and an external structure, and may buffer an impact caused by an external force.

A touch screen panel TNL may be further provided above the display panel PNL. In this case, the protective film PF may be positioned on the touch screen panel TNL. In the case of including the touch screen panel TNL, the cover layer CL may cover at least a portion of the touch screen panel TNL.

The touch screen panel TNL includes a plurality of touch sensors. The touch sensor may be disposed at a position corresponding to the display area of the display panel PNL. The touch sensor may include at least one of a mutual capacitance sensor and a self-capacitance sensor.

The mutual capacitance sensor includes mutual capacitance formed between two touch electrodes. The mutual capacitance sensing circuit applies a driving signal (or stimulation signal) to one of the two electrodes and senses a touch input through the other electrode based on a charge change amount of the mutual capacitance. When a conductor approaches the mutual capacitance, the amount of charge in the mutual capacitance is reduced, so that a touch input or a gesture can be detected.

The self-capacitance sensor includes a self-capacitance formed on each of the sensor electrodes. The self-capacitance sensing circuit supplies charge to each of the sensor electrodes and detects a touch input based on the charge change amount of the self-capacitance. When a conductor approaches the self-capacitance, the capacitance due to the conductor is connected in parallel to the capacitance of the sensor, and the capacitance value increases. Therefore, in the case of self-capacitance, the capacitance value of the sensor increases when a touch input is sensed.

Back plates BPT1 and BPT2 may be further provided below the display panel PNL. The back plates BPT1 and BPT2 support the rear surface of the display panel PNL at the bottom of the display panel PNL. The back plates BPT1 and BPT2 may prevent foreign matter from being attached to the lower portion of the substrate and may serve to buffer shock from the outside. The back plates BPT1 and BPT2 may be made of a material such as poly ethylene terephthalate (PET), poly carbonate (PC), or poly ethylene naphthalate (PEN).

The back plates BPT1 and BPT2 include a first plate BPT1 and a second plate BPT2 respectively positioned on rear surfaces of the first flat part FP1 and the second flat part FP2. The first plate BPT1 reinforces the rigidity of the first flat part FP1 so that the first flat part FP1 can maintain a flat state. The second plate BPT2 reinforces the rigidity of the second flat part FP2 so that the second flat part FP2 can maintain a flat state. In order to secure the flexibility of the curved portion BP and facilitate control of the neutral plane using the cover layer CL, it is preferable that the back plates BPT1 and BPT2 are not located on the rear surface of the curved portion BP. .

8 to 10 are diagrams for explaining problems that may occur as a cover layer is formed.

Referring to FIG. 8 , in order to protect the curved portion BP, the cover layer CL is formed to have an area capable of covering the curved portion BP. However, since resin, which is a material of the cover layer CL, has fluidity, it is difficult to form the cover layer CL in a preset area with a preset thickness. That is, there is a limit to forming the cover layer CL to a desired area and thickness by controlling process conditions. Due to the aforementioned difficulties, the cover layer CL may extend to the top surface as well as the side surface of the protective film PF. In this case, due to the adhesiveness of the cover layer CL, foreign substances may adhere to the upper surface of the protective film PF, and the original function of the protective film PF may deteriorate due to the foreign substances.

Referring to FIGS. 9 and 10 to explain another problem, in order to prevent defects (scratches, etc.) from occurring in the protective film PF due to the external environment during the continuing process, the upper surface of the protective film PF The release film HF is attached to the provided. The release film HF is applied after the process of bonding the circuit element LF to the display panel PNL, the process of bending the curved portion BP of the display panel PNL, and the process of forming the cover layer CL. is finally removed. Thereafter, the cover glass CG is bonded to the upper surface of the protective film PF from which the release film HF is removed (FIG. 9).

At this time, when the cover layer CL is formed to extend to the upper surface of the protective film PF from which the release film HF is not removed, the release film HF is not smoothly peeled off from the upper surface of the protective film PF ( Figure 10). In this case, an unnecessary additional process for peeling the release film HF is required, or a defect in which the cover layer CL is separated from the curved portion BP due to an external force provided to separate the release film HF may occur. can

In addition, if the cover layer CL is formed to extend to the upper surface of the protective film PF from which the release film HF is not removed, even if the release film HF is peeled off from the protective film PF, the release film HF remains intact. Residues of the adhesive or adhesive residues of the cover layer CL located on the upper surface of the release film HF may remain on the upper surface of the protective film PF. The adhesive residue remaining on the upper surface of the protective film may cause interference with other devices, and foreign matter may adhere to the adhesive residue, causing the protective film PF to fail to perform its proper function.

11 is a cross-sectional view showing the shape of a protective film according to an embodiment of the present invention. 12 is a cross-sectional view illustrating an organic light emitting display device including a protective film according to an exemplary embodiment of the present invention.

Referring to (a) and (b) of FIG. 11 , the protective film PF according to the embodiment of the present invention includes a top surface US and a side surface SS adjacent to the cover layer CL. A hot angle α formed between at least a portion of the side surface SS adjacent to the cover layer CL and the upper surface US is an acute angle. In other words, when at least one portion of the side surface SS of the protective film PF adjacent to the cover layer CL is a straight line, the hot angle α formed between the straight line and the upper surface US of the protective film PF is, It's an acute angle. The hot angle α may be preferably 30°<α<60°.

For example, the cross-sectional shape of the side surface SS may have a straight line or an inverted oblique shape. At this time, the hot angle α formed by the straight line and the upper surface US is an acute angle (Fig. 11(a)).

As another example, at least a part of the cross-sectional shape of the side surface SS may have a straight line or an inverted oblique shape. At this time, the hot angle α formed by the straight line and the upper surface US is an acute angle (FIG. 11(b)).

Referring to (c) of FIG. 11 , a tangent TL to a point on a curve constituting at least a part of the side surface SS adjacent to the cover layer CL and the hot angle β formed by the upper surface US are It's an acute angle. In other words, when at least one portion of the side surface SS of the protective film PF adjacent to the cover layer CL is a curve, the tangent TL to a point on the curve and the upper surface US of the protective film PF ) is an acute angle. The hot angle β may be preferably 30˚<β<60˚.

For example, at least a part of the cross-sectional shape of the side surface SS may have a curved shape. At this time, assuming a virtual tangent line TL to a point on the curve, a hot angle β formed by the tangent line TL and the upper surface US is an acute angle.

The protective film PF according to an embodiment of the present invention includes the other side facing the side SS adjacent to the cover layer CL. The other side surface of the protective film PF has a shape different from that of the side surface SS adjacent to the cover layer CL. This means that the other side surface not adjacent to the cover layer CL may have a general shape, unlike the side surface SS adjacent to the cover layer CL.

Referring to FIGS. 11 and 12 , the protective film PF formed under the above conditions has a shape in which the side surface SS is partially recessed inward. An internal space DP open toward the cover layer CL is provided on the side surface SS of the recessed protective film PF. Accordingly, the cover layer CL does not extend to the upper surface US along the side surface SS of the protective film PF and is accommodated in the inner space DP provided on the side surface SS of the protective film PF. can An upper end of the protective film PF protruding toward the cover layer CL may function as a barrier preventing the cover layer CL from extending to the upper surface US of the protective film PF.

The protective film PF according to a preferred embodiment of the present invention has a novel shape different from the conventional one, so that the cover layer CL does not extend to the upper surface US along the side surface SS of the protective film PF. You can control not to. Accordingly, a preferred embodiment of the present invention can prevent foreign substances and adhesive residues from remaining on the upper surface US of the protective film PF, It has the advantage of being able to easily remove the release film (HF, FIG. 9).

13 is a cross-sectional view illustrating an organic light emitting display device including a protective film according to another exemplary embodiment of the present invention.

Referring to FIG. 13 , a touch sensor TS for sensing at least one of a user's touch input, gesture input, and posture input may be directly formed under the protective film PF. . In this case, compared to the structure shown in FIG. 12 , the distance L between the display panel PNL and the upper surface of the protective film PF is reduced. Accordingly, the structure shown in FIG. 13 has an advantage in that the display device can be slimmed/thinned compared to the structure shown in FIG. However, in another embodiment of the present invention, the problem that the cover layer CL extends to the top surface of the protective film PF can be prevented by changing the shape of the side surface SS of the protective film PF.

Through the above description, those skilled in the art will be able to make various changes and modifications without departing from the spirit of the present invention. Therefore, the technical scope of the present invention is not limited to the contents described in the detailed description of the specification, but should be defined by the claims.

PNL: display panel FP1: first flat part
FP2: second flat part BP: curved part
PF: Protective film US: Top surface of the protective film
SS: side of protective film CL: cover layer
BP1, BP2: Back plate TNL: Touch screen panel
LF: circuit element

Claims (10)

A first flat portion, a second flat portion, and a curved portion bent to have a predetermined curvature between the first flat portion and the second flat portion, and a first surface for displaying an image and a surface facing the first surface a display panel including a second surface;
a protective film disposed on the first surface of the display panel on the first flat portion; and
a cover layer disposed on the first surface of the display panel to cover the curved portion;
The lower surface of the protective film faces the first surface of the display panel;
At least a portion of one side of the protective film is disposed in direct contact with one side of the cover layer,
When at least one part of the side surface of the protective film adjacent to the cover layer is a straight line, a hot angle between the straight line and the upper surface of the protective film is an acute angle,
When at least one portion of a side surface of the protective film adjacent to the cover layer is curved, a hot angle between a tangent to a point on the curved surface and an upper surface of the protective film is an acute angle. According to claim 1,
The hot angle (α) is,
Display device with 30˚< α < 60˚. According to claim 1,
The protective film,
A display device that is a polarizing film. According to claim 1,
and a touch screen panel disposed between the display panel and the protective film and having touch sensors. According to claim 4,
The cover layer,
A display device covering at least a portion of the touch screen panel. According to claim 1,
a back plate disposed on the second surface of the display panel;
The back plate,
a first plate provided on the second surface of the display panel in the first flat part; and
and a second plate provided on the second surface of the display panel in the second flat portion. According to claim 1,
Further comprising a circuit element bonded to the first surface of the display panel in the second flat portion;
When the curved portion is bent, at least a portion of the circuit element is positioned on a rear surface of the first flat portion to overlap at least a portion of the first flat portion. According to claim 1,
The cover layer,
A display device made of resin. According to claim 1,
The protective film,
Including the other side opposite to the side adjacent to the cover layer,
The other side of the protective film,
A display device having a shape different from that of the side surface adjacent to the cover layer. According to claim 1,
The display device further comprising a touch sensor formed directly under the protective film.

Images