KR20200075411A - Flexible Display Device - Google Patents

Abstract

The present invention relates to a flexible display device that increases luminance by increasing light efficiency by changing a functional plate placed in a lower part of a display panel, thereby enabling stable driving for a long time. The flexible display device comprises a flexible display panel, a metal plate, and a reflection plate.

Description

Flexible Display Device {Flexible Display Device}

The present invention relates to a flexible display device that improves light efficiency by changing a functional plate located under a display panel.

In recent years, the display field for visually expressing electrical information signals has rapidly developed as the era of full-scale informatization has increased, and in response to this, various flat panel display devices with excellent performance of thinning, lightening, and low power consumption have been developed. Display Device) has been developed to rapidly replace the existing cathode ray tube (CRT).

Specific examples of the flat panel display device include a liquid crystal display device (LCD), a plasma display panel device (PDP), a field emission display device (FED), and an organic light emitting display device (Organic Light Emitting Device: OLED) and the like.

Among them, a self-luminous display device such as an organic light emitting display device is considered as a competitive application for compactness of a device and clear color display without requiring a separate light source.

On the other hand, the organic light emitting display device is provided with an organic light-emitting element that self-emits in each sub-pixel, the organic light-emitting element is located between the two electrodes and the two electrodes, and transported electrons and holes when the light is recombined This flying light layer is provided.

The organic light emitting device (organic light emitting diode, etc.) is a self-emitting device using a thin light-emitting layer between electrodes, so that a separate light source unit is not required, and thus an organic light emitting display device including an organic light emitting device has an advantage of being thinned. A typical organic light emitting display device has a structure in which an organic light emitting element connected to a pixel driving circuit is formed on a substrate, and an image emitted by the light emitted from the organic light emitting element passes through the substrate or a polarizing plate.

Since the organic light emitting display device is implemented without a separate light source device, it is easy to be implemented as a flexible, bendable, or foldable display device, and thus can be designed in various forms.

Accordingly, a display device such as an organic light emitting display device including a self-luminous element is applicable to various fields, such as an automobile instrument panel, a windshield, a mirror display unit, and indoor and outdoor billboards, as well as traditional electronic devices such as TVs. Is expanding. In this case, it is necessary to optimize for each display device use environment.

In particular, a display device attached to a surface having a certain curvature requires flexibility in a configuration added to protect the display panel or upper and lower portions of the display panel as well as to add a specific function so that the curvature is reflected. .

On the other hand, the display device applied to the windshield of a vehicle is a situation in which high brightness is required for image viewing of the display device in an environment in which natural light is strong due to display on transparent glass with the curvature maintenance of the above-described components. In this case, there is a problem in that the life of the display device is deteriorated when the display device is continuously used at high luminance, and high power according to high luminance is required, and heat generation of the display device due to long-time use of high luminance and high power may be a problem.

The present invention is to solve the above-mentioned problems, and relates to a flexible display device that improves luminance by improving a light efficiency by changing a functional plate located under a display panel, thereby enabling stable driving for a long time.

The flexible display device of the present invention improves the luminance of the device by changing the structure, and thus has an effect of reducing power consumption and can increase the lifespan of high luminance.

A flexible display device according to an exemplary embodiment of the present invention includes a substrate, a flexible display panel having an array portion on the substrate, a metal plate positioned below the rear surface of the substrate, and absorbing light emitted from the bottom of the flexible display panel and the Between the flexible display panel and the metal plate, a reflective plate that reflects light emitted from the lower side of the flexible display panel to the array portion may be included.

The metal plate may include a light absorbing coating layer on at least one surface.

The absorbing coating layer may include at least a black resin.

The reflector may be a mirror-treated white sheet.

The reflective plate and the light absorbing coating layer provided on the surface of the metal plate facing the reflective plate may be in contact with each other.

Light reflected from the flexible display panel under the interface between the reflector and the absorbing coating layer may be reflected.

A transparent support film may be further included between the flexible display panel and the reflector.

A wide angle control film for controlling a wide angle may be further included on the array portion.

A transparent cover member may be further included on the wide angle control film.

In addition, the flexible display device of the present invention according to another embodiment, a flexible display panel having an array portion on the substrate, and a metal plate positioned below the rear surface of the substrate and absorbing light emitted from the bottom of the flexible display panel And, between the flexible display panel and the metal plate, a reflective plate for reflecting light emitted from the lower side of the flexible display panel toward the array portion, and a wide-angle control film for adjusting a wide angle of light from the flexible display panel on the array portion and the A transparent cover member may be included on the wide angle control film.

The flexible display device of the present invention has the following effects.

First, by further providing a reflector on the interface side where light is absorbed in the flexible display device, it is possible to improve the front emission amount of light from the reflector, thereby improving brightness.

Second, it is possible to reduce the power consumption for a certain luminance amount by increasing the front emission amount of the display panel, thereby improving the life of the display device according to low-power driving.

Third, the amount of heat generated by the display panel can be reduced according to the reduction in power consumption.

Fourth, it is possible to meet the high luminance characteristics by increasing the amount of light recovery in a device requiring high luminance characteristics, such as an automobile.

1 is an exploded perspective view showing a flexible display device of the present invention
Figure 2 is a cross-sectional view of Figure 1
3A to 3C are cross-sectional views according to first to third experimental examples
4 is a cross-sectional view showing a display panel of the flexible display device of the present invention

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. Throughout the specification, the same reference numbers refer to substantially the same components. In the following description, when it is determined that a detailed description of the technology or configuration related to the present invention may unnecessarily obscure the subject matter of the present invention, the detailed description is omitted. In addition, the component names used in the following description are selected in consideration of the ease of preparing the specification, and may be different from the actual product parts names.

The shapes, sizes, ratios, angles, numbers, etc. disclosed in the drawings for describing various embodiments of the present invention are exemplary, and the present invention is not limited to the details shown in the drawings. Throughout this specification, the same reference numerals refer to the same components. In addition, in the description of the present invention, when it is determined that detailed descriptions of related known technologies may unnecessarily obscure the subject matter of the present invention, detailed descriptions thereof will be omitted. When'include','have','consist of', etc. mentioned in this specification are used, other parts may be added unless'~man' is used. When a component is expressed as a singular number, the plural number is included unless otherwise specified.

In interpreting the components included in various embodiments of the present invention, it is interpreted as including an error range even if there is no explicit description.

In explaining various embodiments of the present invention, when describing the positional relationship, for example,'~top','~top','~bottom','~side', etc. When the positional relationship of parts is described, one or more other parts may be located between the two parts unless'right' or'direct' is used.

In describing various embodiments of the present invention, in the case of explaining the time relationship, temporal sequential relationships such as'after','following','after','before', etc. When is described, it may also include a case where it is not continuous unless'right' or'direct' is used.

In describing various embodiments of the present invention,'first','second', etc. may be used to describe various components, but these terms are only used to distinguish between similar components that are identical to each other. to be. Accordingly, in the present specification, the components modified with'first' may be the same as the components modified with'second' within the technical spirit of the present invention, unless otherwise specified.

Each of the features in various embodiments of the present invention can be partially or wholly combined or combined with each other, technically various interlocking and driving is possible, and each of the various embodiments can be independently implemented with respect to each other or together in an associative relationship. It may be feasible.

1 is an exploded perspective view showing the flexible display device of the present invention, and FIG. 2 is a cross-sectional view of FIG. 1.

1 and 2, a flexible display device according to an exemplary embodiment of the present invention is located on a substrate, a flexible display panel 200 having an array portion on the substrate, and a bottom side of the display panel 200. The display panel 200 includes a metal plate 300 that absorbs light emitted from the lower side of the display panel 200 and a reflector 400 that reflects light emitted from the lower side of the flexible display panel to the array portion between the display panel and the metal plate. .

In addition, in the flexible display device of the present invention, the wide-angle adjustment film 150 and the cover member 100 are further provided to the upper side of the image from the display panel 200.

The cover member 100 corresponds to a display surface side viewed by a viewer, and is a configuration in which a viewer's touch operation can be directly applied. The area inside the dotted line shown in FIG. 1 is an area in which an actual image is projected, and becomes an active area AA, and its outer area is a non-display area NA. The active area AA and the non-display area NA are defined in the same corresponding area in the display panel 200. The cover member 100 is on a display surface where a viewer views an image, and is also called a cover window or a cover glass in that the image is transmitted as a kind of transparent film or glass. The cover member 100 transmits light emitted from the display panel 200 to the outside and is attached to protect the surface of the display panel 200. The cover member 100 is provided with a shielding layer in the non-display area NA, and the active area AA is divided into a transparent part and the non-display area NA is divided into a shield part, so that the configuration under the non-display area NA is It can be prevented from being acknowledged. The cover member 100 may be made of a material having a large Young's modulus, that is, a material having high hardness, in order to reduce cracks due to external impact. Typically, glass can be made of a high-hardness material, but the thickness of a typical glass substrate (substrate) is 0.5 mm or more, and there is a risk of breaking when folded or bent. Therefore, when a flexible state, such as a flexible, bendable, or rollable display device, is required, the material of the cover member 100 is made of glass having a thickness of 0.1 mm or less, or more than a certain transmittance. It is made of a material of high hardness among the transparent plastic substrates.

In this case, the image comes out to the cover member 100 side, and the cover member 100 will be arranged on the side facing the viewer so as to be the top surface. Located on the uppermost side of the cover member 100, relatively non-display areas NA are wide-angle control film 150, display panel 200, and support film 220 so that relatively inward configurations are not visible from the outside. , It may be formed with a larger area than the reflector 400 and the metal plate 300.

In addition, the wide-angle adjustment film 150 includes a wide-angle adjustment structure to adjust the viewing range of the image displayed on the display panel 200. The wide-angle adjustment structure may be provided in the wide-angle adjustment film 150 in a trapezoidal-shaped pattern whose angle is adjusted to a desired viewing range. In most cases, the trapezoidal pattern is formed of a light-shielding material. In some cases, the wide-angle adjustment film 150 may be provided by patterning the top surface of the display panel 200 or the inner surface of the cover member 100 without separately configuring it.

The display panel 200 includes at least one active area (AA), and pixels, which are a basic unit of display, are arranged in an array in the active area. One or more non-active areas (NA) may be disposed around the active area. That is, the non-display area may be adjacent to one or more side surfaces of the display area. The display area and the non-display area may be in a form suitable for the design of an electronic device equipped with the flexible display device.

The display panel 200 is applied to a flexible display device having a bend as illustrated, and the entire configuration may be used in a flexible form by sealing an internal array.

Each pixel in the display area may be associated with a pixel circuit. The pixel circuit may include one or more switching transistors and one or more driving transistors on the backplane of the flexible display panel 200. Each pixel circuit may be electrically connected to a gate line and a data line to communicate with one or more driving circuits such as a gate driver and a data driver located in the non-display area. The driving circuit may be implemented as a thin film transistor (TFT) in the non-display area. Such a driving circuit may be referred to as a gate-in-panel (GIP). In addition, some components, such as data driver ICs, are mounted on a separate printed circuit board 250, such as flexible printed circuit board (FPCB), chip-on-film (COF), and tape-carrier-package (TCP). The signal transmission film 210 may be combined with a connection interface (pad/bump, pin, etc.) disposed in the non-display area. The display panel 200 may also include various additional elements for generating various signals or driving pixels in the active area. The additional element may include an inverter circuit, a multiplexer, an electro static discharge circuit, and the like. The lower end of the non-display area of the display panel 200 may be formed to protrude more by providing the connection interface disposed in the non-display area of the display panel 200. The printed circuit board 250 together with the signal transmission film 210 may be folded to the back side of the metal plate 300 to prevent visibility from the cover member 100.

Meanwhile, a functional member (not shown) may be further provided on the lower side of the wide-angle adjustment film 150 and on the display panel 200. The functional member may be provided to reinforce mechanical/mechanical and optical characteristics required for the flexible display device 200. The functional member may also include additional elements associated with functions other than pixel driving. For example, the functional member may include additional elements that provide a touch sensing function, a user authentication function (eg, fingerprint recognition), a multi-level pressure sensing function, a tactile feedback function, and the like. In addition, the functional member may include a polarizer or the like that controls display characteristics (eg, external light reflection, color accuracy, luminance, etc.). The functional member may be attached to the top surface of the display panel 200 by an adhesive.

Looking at the metal plate 300 of the flexible display device of the present invention with reference to FIG. 2, this is a heat dissipating metal such as aluminum or aluminum alloy as a metal base layer 300a, absorbed on both surfaces of the metal base layer 300a. And coating layers 310a and 310b. Through this, the metal base layer 300a of the heat-dissipating metal component of the metal plate 300 supports the flexible display panel 200 having high flexibility and absorbs heat from its driving from the lower side to increase the temperature of the flexible display panel 200 Can be prevented.

The metal base layer 300a is formed thicker than the flexible display device for a support function and a heat dissipation function, and has a thickness of 0.2 mm or more and 1 mm or less.

The absorbing coating layers 310a and 310b are provided to absorb light from the flexible display panel 200 as a residual light component that does not contribute to display. The absorbent coating layers 310a and 310b are formed to have a thickness of less than 10 μm to 0.1 mm thinner than the metal base layer 300a, and are made of a material such as black resin. In particular, the absorption coating layers 310a and 310b are meaningful not only for absorption of residual light but also for preventing light on the back side of the metal plate 300 from being viewed. When the flexible display device is attached to a glass or the like and configured, light on the back side can be recognized outside the glass, and this light absorbing function is important in terms of appearance.

In addition, the flexible display device of the present invention has a great feature in that it is provided with a reflector 400 between the flexible display panel 200 and the metal plate 300.

The reflector 400 is made of a main material using a white resin such as a white pigment or a white dye as a main material. The reflector 400 is a thin sheet material of 0.1 mm or less, and is easy to cut and cut, so that it is separated from the metal plate 300 that is molded by a metal molding method. The reflective plate 400 is mirror-treated on the surface to mirrorly reflect the residual light exiting from the flexible display panel 200 to the bottom. That is, the flexible display panel 200 uses the reflected light reflected from the reflection plate 400 together with the front emission light emitted from the provided light emitting device. Accordingly, the light recovery amount of the flexible display panel 200 can be increased to improve light efficiency. The reflective plate 400 is mirror-finished on the surface of the reflective plate 400 facing the flexible display panel 200.

The reflective plate 400 may include a metal component, such as aluminum, silver, gold, or copper, or a nickel or chromium plating layer, partially on the surface through a mirror treatment, but the amount of the metal component contained in comparison to the white resin is relatively small. The sheet characteristics of the metal plate 300 and the other reflector 400 are not affected.

Looking at the manufacturing process, the metal plate 300 is formed in units of the metal plate 300 so that the metal base layer 300a has a curved surface by metal molding or the like in accordance with the curvature required for the flexible display device, and then the metal base layer ( Light absorbing coating layers 310a and 310b are formed on both surfaces of 300a). On the other hand, the reflector 400 is manufactured as a thin sheet or a film having a thickness of 0.1 mm or less, and is supplied in a ledger unit including a plurality of unit reflector 400.

In the fastening process, the reflective plate 400 is cut from the unit unit to the unit reflective plate 400, and is easily attached to the surface of the metal plate 300 having a curved surface in the fastening process by the flexibility of the sheet or film.

Compared to the structure formed by stacking a plurality of metal material layers on a metal plate, the flexible display panel 200 of the present invention leaks residual light due to absorption performed by the light absorption coating layer 310a at the interface between the metal plate 300 and the reflection plate 400. There is an advantage that can be prevented, and further have interfacial reflection. In the case of simply laminating the metal material layer, the reflected light is not completely transmitted to the upper portion of the flexible display panel 200 but may be absorbed by total reflection or the like in the metal material, or may be partially dropped below the metal plate, so that multiple metal layers of the metal plate 300 are disposed It is impossible to obtain the light recovery rate as in the flexible display device of the present invention. A specific experimental example will be described later.

Meanwhile, a transparent support film 220 is further provided between the flexible display panel 200 and the reflector 400 to assist the support function of the flexible display panel 200, and the flexible display panel by the reflector 400 ( It is possible to prevent direct contamination of the back surface of 200) and further increase the heat dissipation effect.

The support film 220 is attached to the opposite side (the second side) of the surface (the first side) where the light-emitting element is located on both sides of the substrate of the flexible display panel 200. The supporting film 220 is polyethylene naphthalate (PEN), polyethylene terephthalate (PET), polyethylene ether phthalate (polyethylene ether phthalate), polycarbonate (polycarbonate), polyarylate (polyarylate), poly It may be made of a thin film composed of a combination of polyether imide, polyether sulfonate, polyimide, polyacrylate or other suitable polymer. Other suitable materials that can be used to form the support film 220 may be thin glass, a metal foil shielded with a dielectric, a multi-layer polymer, a polymer film containing a polymer material combined with nanoparticles or microparticles, and the like. have. The support film 220 may be thicker than the substrate (see 151 of FIG. 4) of the flexible display panel 200 for support.

When the support film 220 is provided, after attaching the rear surface of the flexible display panel 200 with the support film 220, a fastening process of the metal plate 300 and the reflector 400 is performed.

Hereinafter, the significance of the light absorbing coating layer on the surface of the reflective plate and the metal plate of the present invention will be described with reference to experimental examples.

3A to 3C are cross-sectional views according to first to third experimental examples.

3A to 3C, each experimental example has a wide-angle adjustment film 150 and a cover member 100 on the display panel 200 in common, and a transparent support film 220 on the lower side of the display panel 200. Have

The first experimental example is provided by attaching the metal plate 300 in a configuration having a metal base layer 300a on the lower side of the support film 220 and absorbing coating layers 310a and 310b on both sides thereof.

In the second experimental example, a single metal base layer 300a was provided under the support film 220.

In the third experimental example, a metal plate is provided with a white glazed sheet reflector 400 under the support film 220, and a metal base layer 300a on the bottom and absorbance coating layers 310a and 310b on both sides thereof. It is provided by attaching (300).

As shown in Table 1, the measured luminance of the first experimental example was 537 nits, the measured luminance of the second experimental example was 540 nits, and the measured luminance of the third experimental example was 562 nits. Looking at this from the viewpoint of the current consumption at the same luminance, it was confirmed that it is possible to reduce the consumption current of 36mA in the first experimental example compared to the second experimental example.

In the first and second experimental examples of the experimental examples, it can be seen that the measured luminance is slightly higher than the first experimental example having the double-sided absorbing coating layer in the second experimental example of the relatively single metal layer, but in actual figures 1 to 2 and Likewise, when configuring the flexible display device as the first experimental example without the absorbing coating layer when applied to a display device for automobiles, there is a problem in that leakage light exiting to the rear side of the flexible display panel is observed.

The inventor of the present invention has configured the flexible display device of the present invention in the third experimental example structure to solve the low luminance characteristics and leakage light problems of the first and second experimental examples described above, and has the advantage of improving luminance and reducing power consumption. Could confirm.

division Measurement luminance [nit] First Experimental Example (Metal plate with double-sided absorption coating layer) 537 2nd Experimental Example (Metal base layer single metal plate) 540 Experimental Example 3 (reflection plate + metal plate with double-sided absorption coating layer) 562

Hereinafter, a detailed configuration of the display panel 200 of the flexible display device of the present invention will be described. 4 is a cross-sectional view showing a display panel of the flexible display device of the present invention.

As shown in FIG. 4, the display panel 200 is a thin film transistor array 152 and an organic light emitting device array 153 are stacked on a substrate 151, and a touch sensor unit on the organic light emitting device array 153 ( 155) is located. In addition to the touch sensor unit 155, additional elements providing a user authentication function (eg, fingerprint recognition), multi-level pressure sensing function, tactile feedback function, etc. are further provided on the organic light emitting device array 153. It can contain.

The thin film transistor array 152 and the organic light emitting diode array 153 may include one or more thin film transistors (TFTs) and the thin film transistors for each of a plurality of sub-pixels defined in a matrix in the active area AA of the substrate 151. It consists of an organic light emitting device (OLED) to be connected. It will be described in detail with reference to FIG. 4.

The substrate 151 supports various components of the display panel 200. The substrate 151 may be formed of a transparent insulating material, for example, an insulating material such as glass or plastic. When the substrate 151 is made of plastic, it may be referred to as a plastic film or plastic substrate. For example, the substrate 151 may be in the form of a film including one selected from the group consisting of polyimide-based polymers, polyester-based polymers, silicone-based polymers, acrylic polymers, polyolefin-based polymers, and copolymers thereof. Among these materials, polyimide is mainly used as a plastic substrate because it can be applied to high-temperature processes and is a material that can be coated. The substrate (array substrate) is also referred to as a concept including an element and a functional layer formed on the substrate 151, for example, a switching TFT, a driving TFT connected to the switching TFT, an organic light emitting element connected to the driving TFT, a protective film, and the like. .

In some cases, a buffer layer (not shown) may be positioned on the substrate 151. The buffer layer is a functional layer for protecting a thin film transistor (TFT) from impurities such as alkali ions flowing out of the substrate 151 or lower layers. The buffer layer may be made of silicon oxide (SiOx), silicon nitride (SiNx), or multiple layers thereof.

The thin film transistor array 152 includes a thin film transistor 130 in which a gate electrode 132, a gate insulating film 112, a semiconductor layer 134, an interlayer insulating film 114, and source and drain electrodes 136 and 138 are sequentially arranged. , TFT). The thin film transistors 130 and TFT are provided in at least one of a plurality of sub-pixels provided in the active area AA on the substrate 151.

The formation order of the semiconductor layer 134 and the gate electrode 132 may be changed.

The semiconductor layer 134 is positioned at a predetermined portion on the substrate 151 or the buffer layer. The semiconductor layer 134 may be made of polysilicon (p-Si), in which case a predetermined region may be doped with impurities. Further, the semiconductor layer 134 may be made of amorphous silicon (a-Si), or may be made of various organic semiconductor materials such as pentacene. Furthermore, the semiconductor layer 134 may be made of oxide. The gate insulating layer 112 may be formed of an insulating inorganic material such as silicon oxide (SiOx) or silicon nitride (SiNx), or may be formed of an insulating organic material. The gate electrode 132 may be formed of various conductive materials, such as magnesium (Mg), aluminum (Al), nickel (Ni), chromium (Cr), molybdenum (Mo), tungsten (W), gold (Au), or alloys thereof. And the like.

The first interlayer insulating layer 114 may be formed of an insulating material such as silicon oxide (SiOx) or silicon nitride (SiNx), or may be formed of an insulating organic material. A contact hole through which the source and drain regions are exposed may be formed by selectively removing the first interlayer insulating layer 114.

The source and drain electrodes 136 and 138 are formed of a single layer or a multi-layer shape as an electrode material on the first interlayer insulating layer 114.

The source and drain electrodes 136 and 138 are covered, and an inorganic protective layer 116 and a planarization layer 118 may be positioned on the thin film transistor. The inorganic protective film 116 and the planarization layer 118 protect the thin film transistor and planarize the upper portion. The inorganic protective film 116 may be formed of an inorganic insulating film such as a silicon nitride film (SiNx) or a silicon oxide film (SiOx), and the planarization layer 118 is made of an organic insulating film such as benzocyclobutene (BCB) or acrylic (Acryl). Each of the inorganic protective layer 116 and the planarization layer 118 may be formed of a single layer, or may be composed of a double layer or multiple layers. In some cases, one of the two layers may be omitted.

It is referred to as a thin film transistor array 152 including thin film transistors 130 and TFT provided in each sub-pixel on the substrate 151, an inorganic protective film 116, and a planarization layer 118.

The organic light emitting device (OLED) connected to the thin film transistor (TFT) may have a form in which the first electrode 122, the organic light emitting layer 124, and the second electrode 126 are sequentially arranged. That is, the organic light emitting device (OLED) is the first electrode 122 and the first electrode 122 connected to the drain electrode 138 through the connection hole 148 provided in the planarization layer 118 and the inorganic protective layer 116. ), the organic light emitting layer 124 and the second electrode 116 located on the organic light emitting layer 114.

When the display panel 200 is a top emission method in which emission is performed on the second electrode 126, the first electrode 122 may include an opaque conductive material having high reflectance. In this case, the reflective conductive material included may be, for example, silver (Ag), aluminum (Al), gold (Au), molybdenum (Mo), tungsten (W), chromium (Cr), or alloys thereof. .

The bank 128 opens the light emitting area and is formed in the remaining areas except the light emitting area. Accordingly, the bank 128 has a bank hole exposing the first electrode 122 corresponding to the emission region. The bank 128 may be made of an inorganic insulating material such as a silicon nitride film (SiNx) or a silicon oxide film (SiOx) or an organic insulating material such as BCB, acrylic resin or imide resin.

The organic light emitting layer 124 is positioned on the first electrode 122 exposed by the bank 128. The organic light emitting layer 124 may include a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, and an electron injection layer. In addition, the organic light emitting layer 124 may be composed of a single light emitting layer structure that emits one light in a single stack, or a multiple stack structure including a plurality of stacks and a single light emitting layer of the same color in each stack. Can be configured. In this case, for displaying various colors, adjacent sub-pixels may be arranged to emit different emission colors. For example, sub-pixels having red, green, and blue emission layers may have a side-by-side or triangular shape. In some cases, an arrangement of white sub-pixels may be added. With the arrangement structure of the other organic light emitting layer 124, a plurality of stacks including light emitting layers emitting different colors may be stacked to express white color. When white is expressed in a stacked structure, a separate color filter may be further added to each sub-pixel.

The second electrode 126 is positioned on the organic emission layer 124. When the display panel 200 is a top emission type, the second electrode 126 is made of a transparent conductive material such as Indium Tin Oxide (ITO) or Induim Zinc Oxide (IZO). The formed or formed of a semi-transmissive metal or a metal alloy such as MgAg may emit light generated from the organic light emitting layer 124 to the second electrode 126.

In FIG. 4, the organic light emitting device array 153 is formed by stacking the first electrode 122, the organic light emitting layer 124, and the second electrode 126 on the thin film transistor array 152. In addition to the layered structure, it may be configured to include a capping layer (not shown) on the top. The capping layer protects the organic light emitting diode (OLED) and helps extract light emitted from the second electrode 126.

The organic light emitting device array 153 includes an encapsulation layer 140. The encapsulation layer 140 prevents oxygen and moisture penetration from outside in order to prevent oxidation of the light emitting material and the electrode material. When the organic light emitting diode (OLED) is exposed to moisture or oxygen, a pixel shrinkage phenomenon in which the emission region is reduced may occur, or a dark spot in the emission region may occur. The encapsulation layer 140 is formed of a glass, metal, aluminum oxide (AlOx) or silicon (Si)-based material made of inorganic films 142 and 146 and the stress between each layer due to bending of the display panel 200 It serves as a buffer to mitigate, and is formed in an alternating configuration of the organic layer 144 that enhances the flattening performance. Here, the component of the organic film 144 may be an organic insulating material such as acrylic resin, epoxy resin, polyimide, polyethylene, or silicon oxycarbon (SiOC). At this time, the first and second inorganic films 142 and 146 block the penetration of moisture and oxygen, and the organic film 144 serves to planarize the surface of the first inorganic film 142. The reason for forming the encapsulation layer as a multi-layered thin film layer is to make the movement path of moisture or oxygen longer and more complicated than the single layer, making it difficult to penetrate moisture/oxygen to the organic light emitting element array 153.

Although not shown, in some cases, a protective layer is further formed between the organic light emitting device (OLED) and the encapsulation layer 140, so that the side surface of the encapsulation layer 140 is peeled or uniform during the manufacturing process of the encapsulation layer 140. The encapsulation layer 140 may be protected from being affected. In some cases, since the encapsulation layer 140 is an essential component for an organic light emitting device (OLED) that is susceptible to moisture, it is also referred to as a configuration of the organic light emitting device array 153. 4 is a diagram showing an organic light emitting device array 153 in a configuration including the encapsulation layer 140 and an organic light emitting device (OLED).

Meanwhile, the display panel 200 of the present invention further includes a touch sensor unit 155 on the organic light emitting element array 153 to recognize a viewer's (user's) touch operation.

The touch sensor unit 155 is arranged to cross each other and has a first touch wire 1154 and a second touch wire 1152b on the same side of which a voltage signal is applied and the other senses a voltage signal. . The first touch wiring 1154 and the second touch wiring are provided with a main pattern 1154e (not shown) patterned in the same shape as a polygon or a circle on the touch insulating layer 1158, and adjacent main patterns are provided. For connection, the first and second bridge patterns 1154b and 1152b are shown on different layers. In the drawing, although the first bridge pattern 1154b is formed directly on the organic light emitting device array 153, the present invention is not limited thereto, and an insulating film or an insulating substrate is further provided on the organic light emitting device array 153. A first bridge pattern 1154b may be provided on the upper portion. The second bridge pattern 1152b is located on the same layer as the main pattern of the second touch wiring, that is, on the touch insulating layer 1158 and may be integrally formed. In this case, the main pattern 1154e of the first touch wiring 1154 is electrically separated from the second touch wiring.

An adhesive layer (not shown) may be further provided between the cover member 100 and the touch sensor unit 155 to form a bonding state with each other.

On the other hand, for a voltage signal application and signal sensing in the touch sensor unit 155, a first flexible film (not shown) is located at one end of the first touch wiring 1154 and the second touch wiring 1152b. It can be connected to the pads (not shown). For example, the touch pads may be located on the same layer as the first bridge pattern 1154b, that is, on the organic light emitting element array 153.

In order to increase the strength and/or rigidity of the display panel 200, one or more support layers (not shown) may be provided below the substrate 151, that is, on the opposite side of the display surface. The support layer is attached to the opposite side (the second side) of the side (first side) where the organic light emitting element is located on both sides of the substrate 151. The support layer is polyethylene naphthalate (PEN), polyethylene terephthalate (PET), polyethylene ether phthalate (polyethylene ether phthalate), polycarbonate (polycarbonate), polyarylate (polyarylate), polyether imide (polyether imide), polyether sulfonate (polyether sulfonate), polyimide (polyimide), polyacrylate (polyacrylate) or may be made of a thin film composed of a combination of other suitable polymers. Other suitable materials that can be used to form the support layer may be thin glass, a metal foil shielded with a dielectric, a multi-layer polymer, a polymer film containing a polymer material combined with nanoparticles or microparticles, and the like.

Meanwhile, the support film 220 of FIG. 1, the reflector 400, and the metal plate 300 may be sequentially positioned on the rear surface (lower surface) of the display panel 200.

The flexible display device of the present invention further includes a reflector on the interface side where light is absorbed, so that the amount of light emitted from the reflector can be improved, thereby improving luminance.

In addition, it is possible to reduce the power consumption for a certain amount of luminance by increasing the output amount of the front surface of the display panel (the upper side of the display panel), thereby improving the life of the display device according to low-power driving.

In addition, the amount of heat generated by the display panel may be reduced according to a reduction in power consumption. This may prevent the temporal damage of components provided in the display device by reducing the amount of heat generated by the display device, and thus may have an effect of increasing life.

In a device requiring high luminance characteristics such as a vehicle, the flexible display device of the present invention induces upper reflection between the interface between the reflector 400 and the metal plate 300 among the light coming out of the lower portion of the flexible display panel 200, and By increasing the amount of light recovery, it is possible to meet the high luminance characteristics of the device.

Although the embodiments of the present specification have been described in detail with reference to the accompanying drawings, the present specification is not necessarily limited to these embodiments, and may be variously modified without departing from the technical spirit. Therefore, the embodiments disclosed in the present specification are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. Each of the features of the various embodiments of the present invention may be partially or wholly combined or combined with each other, and may be technically interlocked and driven by a person skilled in the art, and each of the embodiments may be implemented independently of each other or together in an associative relationship. It may be practiced. The scope of protection of the present invention should be interpreted by the following claims, and all technical spirits within the equivalent range should be interpreted as being included in the scope of the present invention.

100: cover member 150: wide-angle control film
200: (flexible) display panel 210: signal transmission film
220: support film 250: source printed circuit board
300: metal plate 300a: metal base layer
310a: first absorbing coating layer 310b: second absorbing coating layer
400: reflector

Claims (14)

A flexible display panel having a substrate and an array portion on the substrate;
A metal plate positioned under the rear surface of the substrate and absorbing light emitted from the lower side of the flexible display panel; And
A flexible display device including a reflective plate that reflects light emitted from a lower side of the flexible display panel to the array unit between the flexible display panel and the metal plate. According to claim 1,
The metal plate is a flexible display device including an absorbing coating layer on at least one surface. According to claim 2,
The absorbent coating layer is a flexible display device comprising at least a black resin. According to claim 1,
The reflective plate is a white sheet that is a mirror-treated white sheet. According to claim 2,
A flexible display device in which the reflective plate and the light absorbing coating layer provided on the surface of the metal plate facing the reflective plate are in contact with each other. According to claim 2,
A flexible display device that reflects light emitted from the interface between the reflector and the absorbing coating layer, and exits below the flexible display panel. According to claim 1,
A flexible display device further comprising a transparent support film between the flexible display panel and the reflector. According to claim 1,
A flexible display device further comprising a wide angle control film for controlling a wide angle on the array portion. The method of claim 8,
A flexible display device further comprising a transparent cover member on the wide angle control film. A flexible display panel having a substrate and an array portion on the substrate;
A metal plate positioned under the rear surface of the substrate and absorbing light emitted from the lower side of the flexible display panel;
A reflector reflecting light emitted from a lower side of the flexible display panel to the array unit between the flexible display panel and the metal plate;
A wide angle control film for adjusting a wide angle of light emitted from the flexible display panel on the array unit; And
A flexible display device including a transparent cover member on the wide angle control film. The method of claim 10,
The metal plate is a flexible display device including an absorbing coating layer on at least one surface. The method of claim 11,
The absorbent coating layer is a flexible display device comprising at least a black resin. The method of claim 10,
The reflective plate is a white sheet that is a mirror-treated white sheet. The method of claim 11,
A flexible display device in which the reflective plate and the light absorbing coating layer provided on the surface of the metal plate facing the reflective plate are in contact with each other.

Images