KR20210055199A - Display Device - Google Patents

Abstract

The present invention provides a display device which includes: a display panel; a heat dissipation plate bonded to a rear surface of the display panel; and a first adhesive layer attached between the display panel and the heat dissipation plate. The heat dissipation plate has at least one or a plurality of groove patterns concavely formed from the rear surface of the heat dissipation plate. The present invention provides the display device capable of preventing a curved heat dissipation plate from being restored to be in a flat state.

Description

Display Device

The present invention relates to a display device, and to a display device capable of preventing a heat dissipation plate attached to a rear surface of a curved display panel from being restored in a planar direction in high temperature reliability evaluation.

Video display, which embodies a variety of information as a screen, is a core technology in the information and communication era, and is evolving in the direction of thinner, lighter, and higher performance. Accordingly, there is a flat panel display that can reduce the weight and volume of a cathode ray tube (CRT), a liquid crystal display that receives light from a light source to realize an image, and an organic light emitting display that can omit the light source unit because it can emit light. Be in the spotlight.

In such a display, a plurality of pixels are arranged in a matrix to display an image. Here, each pixel includes a light-emitting element and a pixel driving circuit including a plurality of transistors that independently drive the light-emitting element.

In recent years, research on thin and light display panels has been actively conducted, and display devices in which display panels can be curved or folded and unfolded are also being supplied.

However, while making the display device small and thin, it is difficult to dissipate heat generated from the display panel or circuit board to the outside, and there is a problem that the thin display panel and the heat dissipation plate are continuously exposed to heat generation, so that they are separated from each other. .

The present invention is to solve such a problem, and more particularly, a display capable of preventing the curved heat dissipation plate from being restored to a flat state by adding a groove pattern to the heat dissipation plate adhered to the rear surface of the curved display panel. Its purpose is to provide a device.

In order to solve such a problem, the present invention is a display panel; A heat radiation plate adhered to the rear surface of the display panel and a first adhesive layer attached between the display panel and the heat radiation plate; Including, the heat dissipation plate provides a display device provided with at least one or a plurality of groove patterns formed concave from the rear surface of the heat dissipation plate.

The display device may include a cover glass disposed in front of the display panel; A second adhesive layer adhering between the cover glass and the display panel; And an ink layer disposed along an edge region between the cover glass and the second adhesive layer.

The display panel may be formed in a curved surface having a concave front surface along the vertical direction.

A plurality of groove patterns may be provided at equal intervals along the left and right directions on the rear surface of the heat dissipation plate.

The groove pattern may increase in density or depth of the groove at the rear surface of the heat dissipating plate corresponding to the region in which the ink layer is formed.

The groove pattern may be formed in a range of 1 to 5 mm from the rear surface of the heat dissipation plate to the inner side of the ink layer.

The groove pattern may be formed to a depth in the range of 30 to 70% of the thickness of the heat dissipation plate.

The display panel has a first planar area disposed on one side, a second planar area disposed on the other side parallel to the first planar area, and a curved surface having a concave front surface between the first and second planar areas. Including a curved area to be formed, it may be formed of a single display area.

The groove pattern may be formed to correspond only to the curved area.

According to the display device of the present invention,

First, by forming a groove pattern on the heat dissipation plate, it is possible to prevent the bonded state from falling from the curved display panel in high temperature reliability evaluation,

Second, it is possible to increase the rear area of the heat dissipation plate, thereby increasing the heat dissipation effect.

1 is a rear view showing a rear surface of a display device according to a first embodiment of the present invention.
FIG. 2 is a cross-sectional view illustrating a state in which a curved display panel and a heat dissipating plate of the display device shown in FIG. 1 are bonded together.
FIG. 3 is a cross-sectional view illustrating a section A-A' of the display device shown in FIG. 1.
4 is a rear view and a side view showing a heat dissipation plate on which a groove pattern shown in FIG. 1 is formed.
5 is a rear view showing a rear surface of a display device according to a second embodiment of the present invention.
FIG. 6 is a partially enlarged view showing a partially enlarged side of a section BB′ of the display device shown in FIG. 5.
7 is a rear view showing a rear surface of a display device according to a third embodiment of the present invention.
8 is a partially enlarged view showing a partially enlarged side surface of the display device shown in FIG. 7.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings so that those of ordinary skill in the art can easily implement them. It should be noted that, in the accompanying drawings, the same reference number is used as much as possible when indicating the same configuration in other drawings. In addition, in describing the present invention, when it is determined that a detailed description of a related known function or a known configuration may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted. In addition, certain features shown in the drawings are enlarged or reduced or simplified for ease of description, and the drawings and their components are not necessarily drawn to scale. However, those skilled in the art will readily understand these details.

In the present application, the "display device" may include a display device such as a liquid crystal module (LCM) including a display panel and a driver for driving the display panel, and an OLED module. . In addition, equipment including laptop computers, televisions, computer monitors, automotive displays, or other forms of vehicles, which are complete products or final products including LCM, OLED modules, etc. A set electronic device such as a display, a mobile electronic device such as a smart phone or an electronic pad, or a set device or a set apparatus may also be included.

1 is a rear view showing a rear surface of a display device according to a first embodiment of the present invention, and FIG. 2 is a cross-sectional view showing a state in which a curved display panel and a heat dissipation plate of the display device shown in FIG. 1 are bonded together, FIG. 3 is a cross-sectional view showing a section A-A' of the display device shown in FIG. 1 by cutting, and FIG. 4 is a rear view and a side view showing a heat dissipating plate on which a groove pattern shown in FIG. 1 is formed.

1 to 4, a curved display device having a constant curvature is applied to the display device 100 according to the first embodiment of the present invention, and the display panel 110 and the heat dissipating plate 120 and a first adhesive layer 130 may be included.

First, the display panel 110 may be any type of display panel such as a liquid crystal display panel and an electroluminescent display panel. For example, in an electroluminescent display, an organic light emitting diode (OLED) display panel, a quantum-dot light emitting diode display panel, or an inorganic light emitting diode display panel Can be used.

For example, when the display panel 110 is a liquid crystal display panel, it includes a plurality of gate lines and data lines, and pixels formed in an intersection area between the gate lines and data lines. In addition, an array substrate including a thin film transistor, which is a switching element for controlling light transmittance in each pixel, an upper substrate including a color filter and/or a black matrix, and a liquid crystal layer formed between the array substrate and the upper substrate. It can be configured to include.

In addition, when the display panel 110 is an organic electroluminescent (OLED) display panel, it may include a plurality of gate lines and data lines, and pixels formed in an intersection area between the gate lines and data lines. In addition, an array substrate including a thin film transistor, which is an element for selectively applying a voltage to each pixel, and an encapsulation substrate or phosphorus disposed on the array substrate to cover the organic light emitting element (OLED) layer and the organic light emitting element layer on the array substrate. It may be configured to include an encapsulation substrate or the like. The encapsulation substrate may protect the thin film transistor and the organic light emitting device layer from external impact, and prevent moisture or oxygen from penetrating into the organic light emitting device layer.

The layer formed on the array substrate may include an inorganic light emitting layer, for example, a nano-sized material layer or quantum dot.

In addition, a pad portion (not shown) connected to each signal line provided in the pixel array may be provided at one edge portion of the array substrate, and the pad portion is connected to a circuit board driving the panel. Although not shown in the drawing, a separate back plate may be attached to the rear surface of the array substrate.

The display panel may include a touch panel disposed on the array substrate. In this case, a touch panel and a polarizing film may be further provided on the upper surface of the array substrate. The polarizing film may provide a function of improving visibility of the display panel 110 by preventing reflection of light introduced from the outside. The touch panel may sense a user's touch signal.

A light control film (LCM) may be provided on the touch panel. The light control film may prevent an increase in a viewing angle in an unnecessary direction by adjusting an angle of light emitted from the display panel 110. In addition, a cover window 140 may be provided on the outermost side of the display panel 110. The cover window 140 may be a cover glass made of a glass material or a cover plastic made of a plastic material.

In addition, a transparent adhesive layer may be disposed between the polarizing film and the touch panel, between the touch panel and the light control film, and between the light control film and the cover window. The pressure sensitive adhesive (PSA) including an optical clear adhesive (OCA) or an optical clear resin (OCR) for UV curing may be applied to the adhesive layer.

Hereinafter, the display panel 110 will be described as an example to which an electroluminescent display panel is applied. However, it is not limited thereto. For example, as the display panel 110, a quantum dot light emitting display panel of an electroluminescent display, an organic light emitting display panel, or an inorganic light emitting display panel may be applied.

The heat dissipation plate 120 is attached to the rear surface of the display panel 110. As shown in FIG. 2, first, a flat heat dissipation plate 120 is disposed on the rear surface of the curved display panel 110 bent at a set curvature, and a first adhesive layer between the display panel 110 and the heat dissipation plate 120 When 130 is provided and pressurized while transporting the display panel 110 and the heat dissipation plate 120 on a rotating bonding roll, the display panel 110 and the heat dissipation plate 120 are bonded as shown in FIG. 3. It becomes a state of being. Of course, prior to this process, the cover glass 140 is bonded to the front surface of the display panel 110 by the second adhesive layer 150, and the edge region between the cover glass 140 and the second adhesive layer 150 is formed. Accordingly, the ink layer 160 may also be provided.

The heat dissipation plate 120 may have a shape corresponding to the shape of the display panel 110, and may be made of aluminum or copper material having excellent thermal conductivity. Of course, the shape and material of the heat dissipation plate 120 are not limited thereto. For example, the shape of the heat dissipation plate 120 may have a shape corresponding to the position or structure of the circuit board 111 coupled to the rear surface of the display panel 110 or the heat dissipation plate 120. In addition, the material of the heat dissipation plate 120 may be made of one of gold, silver, magnesium, carbon fiber, graphite, and graphene having excellent thermal conductivity.

In addition, a groove pattern 121 formed in a concave shape is provided on the rear surface of the heat dissipation plate 120. The groove pattern 121 is formed in a horizontal direction perpendicular to the vertical direction in which the curvature of the curved display panel 110 is formed. That is, the front surface of the display panel 110 is formed in a concave curved surface along the vertical direction, and the groove pattern 121 is disposed along the horizontal direction perpendicular to the curvature of the display panel 110. In addition, a plurality of groove patterns 121 may be arranged side by side with each other at equal intervals. This is because the display panel 110 has a constant curvature, so that the heat dissipation plate 120 maintains a constant curvature at the back of the display panel 110, and also prevents the heat dissipation plate 120 from being restored to a flat shape in a high temperature reliability test. It is preferable that the groove patterns 121 are arranged at equal intervals to be able to do so. Of course, the groove pattern 121 is arranged so as to maintain equal intervals on the rear surface of the heat dissipation plate 120, but depending on the heating structure of the display panel or the heating structure according to the coupling position of the circuit board 111 coupled to the rear surface of the heat dissipation plate The depth d of the groove pattern 121 may be adjusted differently.

As shown in FIG. 3, between the cover glass 140 and the second adhesive layer 150, the ink layer 160 is formed along the edge region of the display panel 110. The ink layer 160 is formed in the bezel area to divide the active area and the non-active area. It is preferable that the ink layer 160 is coated in a black color to prevent light leakage and to prevent the internal wiring from seeing through.

Here, the groove pattern 121 is formed with a gap l so as to be spaced apart from the ink layer 160 in a range of 1 to 5 mm in a direction inside the active area. That is, the starting point or the ending point of the groove pattern 121 on the rear surface of the heat dissipating plate 120 is located at least in the inner direction of the ink layer 160. Accordingly, since the ink layer 160 is disposed along the edge region of the display panel 110, the groove pattern 121 is positioned at a distance l of the set range further inside.

In addition, the depth of the groove pattern 121 may be made of a thickness (d) consisting of about 30 to 70% of the thickness of the heat dissipation plate 120. More preferably, the groove pattern 121 is formed with a thickness (d) of 50% of the thickness of the heat dissipation plate 120. Of course, as described above, it is possible to adjust the depth of the groove pattern 121 within a set range according to the heating structure.

In this way, by forming the groove pattern 121 on the rear surface of the heat dissipation plate 120, it is possible to prevent an increase in the amount of heat generated or from being restored to a flat shape before the heat dissipation plate 120 was curved during a high temperature reliability test. In addition, since the groove pattern 121 is formed on the rear surface of the heat dissipation plate 120, the heat transfer area increases, thereby increasing heat dissipation performance.

FIG. 5 is a rear view showing a rear surface of a display device according to a second embodiment of the present invention, and FIG. 6 is a partially enlarged view showing a side surface of section B-B' of the display device shown in FIG. 5. The same reference numerals as the reference numerals mentioned below indicate the same elements.

5 and 6, in the display device 200 according to the second embodiment of the present invention, the display panel 110 and the heat dissipation plate 220 are bonded together by the first adhesive layer 130, and the display panel A cover glass 140 may be attached to the front surface of 110 by the second adhesive layer 150.

In the second embodiment of the present invention, a first groove pattern 221 and a second groove pattern 222 are provided on the rear surface of the heat dissipation plate 220.

The first groove pattern 221 may provide the same function as in the first embodiment described above. In addition, the second groove pattern 222 may have an increased density or a depth of the groove compared to the first groove pattern 221. That is, the second groove pattern 222 may have a relatively larger amount of heat than the region in which the first groove pattern 221 is formed or may be disposed in a portion vulnerable to heat generation.

In addition, as shown in FIG. 6, in the display apparatus 200, as the ink layer 160 is inserted into the edge region of the display panel 110, a difference in thickness as much as the ink layer 160 occurs, and the heat dissipation plate is adhered to each other due to the difference in thickness. An imbalance may occur in the size of the area or the bonding area. And for this reason, the bonded state of the heat dissipation plate 220 may fall.

In order to prevent this, in the second embodiment of the present invention, by disposing the second groove pattern 222 corresponding to the peripheral area of the ink layer 160, the heat dissipation plate 220 is 160) can be prevented from falling due to the difference in thickness. That is, even when an imbalance occurs in the size of the bonding area or bonding area with the display panel 110 due to the difference in the thickness of the ink layer 160, the heat dissipation plate 220 has a flat shape due to thermal deformation. The restoring force to return to the second groove pattern 222 can be significantly reduced.

Of course, the structure for preventing the heat dissipation plate 220 from falling due to the difference in thickness of the ink layer 160 has been described based on the curved display device 200 in this embodiment, but the ink layer 160 The provided structure may include the first groove pattern 221 or the second groove pattern 222 to prevent the heat dissipation plate 220 from falling due to a difference in thickness of the ink layer 160. That is, the groove pattern may reduce the restoring force that the heat dissipation plate 220 tries to restore from a curved surface to a flat surface, and also, due to the same configuration as the ink layer 160, a height difference occurs, resulting in an imbalance in the size of the bonding area or bonding area Even when the groove pattern is provided, it is possible to prevent the heat dissipation plate 220 from falling from the display panel 110.

FIG. 7 is a rear view showing a rear surface of a display device according to a third embodiment of the present invention, and FIG. 8 is a partially enlarged view showing a partially enlarged side surface of the display device shown in FIG. 7.

7 and 8, in the display device 300 according to the third embodiment of the present invention, the display panel 110 and the heat dissipation plate 320 are bonded together by the first adhesive layer 130, and the display panel A cover glass 140 may be attached to the front surface of 110 by the second adhesive layer 150.

In addition, the display device 300 according to the third embodiment of the present invention includes a first flat area FA1 disposed on one side, and a second flat area FA2 and a first flat area FA1 disposed on the other side. And a curved area CA disposed between the and the second flat area FA2.

As shown in FIG. 8, the first and second planar regions FA1 and FA2 may be disposed side-by-side in the vertical direction or may be disposed side-by-side in the left and right directions. Hereinafter, as an example, the first flat area FA1 and the second flat area FA2 are arranged in the vertical direction around the curved area CA.

The curved area CA is formed of a curved surface in which the front display area is concave, and forms one display area together with the first flat area FA1 and the second flat area FA2.

At this time, since the groove pattern is not required in the flat area, the groove pattern 321 is formed only on the heat dissipation plate 320 corresponding to the curved area CA. In addition, when the curved area CA has a uniform curvature, the groove pattern 321 at equal intervals may be formed, and at a position where the curvature is reduced between the curved area CA and the flat areas FA1 and FA2, the groove The pattern 321 may be formed to decrease in density or decrease in depth. In addition, even when a plurality of curved areas CA are disposed, a groove pattern 321 may be formed at a position corresponding to each curved area on the rear surface of the heat dissipation plate 320.

In the above, a specific embodiment has been described with reference to the drawings in order to illustrate the technical idea of the present invention, but the present invention is not limited to the same configuration and effect as the specific embodiment as described above, and various modified examples are the scope of the present invention. It can be carried out within the limit of not departing from. Therefore, such a modified example should be regarded as belonging to the scope of the present invention, and the true technical protection scope of the present invention should be determined by the technical spirit of the claims to be described later.

100: display device
110: display panel
120: heat dissipation plate
130: first adhesive layer
140: cover glass
150: second adhesive layer
160: ink layer

Claims (9)

Display panel;
A heat dissipation plate adhered to the rear surface of the display panel, and
A first adhesive layer attached between the display panel and the heat dissipation plate; Including,
The heat dissipation plate is a display device having at least one or a plurality of groove patterns formed concave from the rear surface of the heat dissipation plate. The method according to claim 1,
A cover glass disposed in front of the display panel;
A second adhesive layer adhering between the cover glass and the display panel;
An ink layer disposed along an edge region between the cover glass and the second adhesive layer; Display device further comprising a. The method according to claim 2,
The display panel is a display device in which the front surface is formed in a concave curved surface along the vertical direction. The method of claim 3,
The groove pattern,
A display device provided with a plurality of equal intervals along the left and right directions on the rear surface of the heat dissipation plate. The method of claim 3,
The groove pattern,
A display device in which a density or a depth of a groove increases in a rear surface of the heat dissipating plate corresponding to a region in which the ink layer is formed. The method of claim 5,
The groove pattern,
A display device that is formed in a range of 1 to 5 mm from the rear surface of the heat dissipation plate to the inside of the ink layer. The method of claim 5,
The groove pattern,
A display device formed to a depth in the range of 30 to 70% of the thickness of the heat dissipation plate. The method according to claim 2,
The display panel,
A first plane area disposed on one side,
A second planar area disposed on the other side parallel to the first planar area,
A display device having one display area, including a curved area in which a front surface is formed as a concave curved surface between the first and second flat areas. The method of claim 8,
The groove pattern is formed to correspond only to the curved area.

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