DISPLAY DEVICE AND METHOD FOR PREPARING SAME

Embodiments of the present disclosure provide a display device and a method for preparing same. According to the display device provided in the embodiments of the present disclosure, a groove is provided in a second non-display area of a packaging cover plate, and a light-shielding layer is disposed in the groove. The light-shielding layer can shield metal traces in a first non-display area of a display panel. In this way, a problem of reflection of the metal traces in the first non-display area of the display panel is resolved, thereby enhancing visual perception and an all-black effect of the display panel.

FIELD OF INVENTION

The present disclosure relates to the field of display technologies, and in particular, to a display device and a method for preparing same.

BACKGROUND OF INVENTION

An organic light-emitting diode (OLED) display panel is a display panel made using an organic light-emitting diode. The OLED display panel is considered as an emerging application technology of a flat panel display of the next generation due to its excellent characteristics such as no need for backlight, high contrast, a small thickness, a wide viewing angle, a fast response speed, a wide range of application temperatures, a simple structure and process, and the like.

SUMMARY OF INVENTION

Technical Problem

An OLED display panel includes a rigid OLED display panel and a flexible OLED display panel. At present, the rigid OLED display panel mostly adopts transparent glass to package a device layer to achieve an effect of blocking oxygen and water vapor. However, since the glass is transparent, metal traces on a bottom array base plate (that is, a thin film transistor20array base plate) can be obviously seen in a non-display area of the display panel. The metal traces are still visible to naked eyes even after a polarizer is attached, and especially light can be reflected in an environment with strong natural light, which seriously affects an appearance display effect and an all-black effect of the OLED display panel.

Technical Solution

Embodiments of the present disclosure provide a display device and a method for preparing same. In this way, a problem of reflection of metal traces in a non-display area of a display panel can be resolved, thereby enhancing visual perception and an all-black effect of the display panel.

The embodiment of the present disclosure provides a display device. The display device includes a display panel and a packaging cover plate that are disposed opposite to each other. The display panel includes a first display area and a first non-display area disposed on a periphery of the first display area. The packaging cover plate includes a second display area and a second non-display area disposed on a periphery of the second display area. The first display area corresponds to the second display area, and the first non-display area corresponds to the second non-display area. A groove is provided in the second non-display area, and a light-shielding layer is disposed in the groove.

Beneficial Effects

According to the display device provided in the embodiments of the present disclosure, a groove is provided in a second non-display area of a packaging cover plate, and a light-shielding layer is disposed in the groove. The light-shielding layer can shield metal traces in a first non-display area of a display panel. In this way, a problem of reflection of the metal traces in the first non-display area of the display panel is resolved, thereby enhancing visual perception and an all-black effect of the display panel.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

The technical solutions of the embodiments of the present disclosure are clearly and completely described in the following with reference to the accompanying drawings of the embodiments of the present disclosure. Apparently, the described embodiments are merely some but not all of the embodiments of the present disclosure. All other embodiments obtained by a person skilled in the art based on the embodiments of the present disclosure without creative efforts shall fall within the protection scope of the present disclosure.

An embodiment of the present disclosure provides a display device. Referring toFIGS.1to3,FIG.1is a schematic diagram of a first structure of a display device according to an20embodiment of the present disclosure,FIG.2is a schematic top view of a packaging cover plate according to an embodiment of the present disclosure, andFIG.3is a schematic cross-sectional view of the packaging cover plate according to an embodiment of the present disclosure. The display device100includes a display panel120and a packaging cover plate110that are disposed opposite to each other. The display panel120includes a first display area21and a25first non-display area22disposed on a periphery of the first display area21. The packaging cover plate includes a second display area11and a second non-display area12disposed on a periphery of the second display area11. The first display area21corresponds to the second display area11, and the first non-display area22corresponds to the second non-display area12. A groove121is provided in the second non-display area, and a light-shielding layer122is disposed in the groove121.

It can be understood that, the packaging cover plate110is configured to package the display panel120to isolate water, oxygen, and dust, thereby prolonging a service life of the display panel120.

For example, the display device100can be a tablet computer, a notebook computer, a display, a television, and the like.

Metal traces are usually disposed in the first non-display area22of the display panel120. Therefore, there is a problem of reflection of the metal traces. According to the display device100provided in the embodiment of the present disclosure, the groove121is provided in the second non-display area12of the packaging cover plate110, and the light-shielding layer122is disposed in the groove121, so that the light-shielding layer122in the packaging cover plate110can effectively shield the metal traces in the first non-display area22of the display panel120. In this way, the problem of the reflection of the metal traces in the first non-display area22can be resolved, thereby enhancing visual perception and an all-black effect of the display panel120.

In the related art, in order to resolve the problem of the reflection of the metal traces on the periphery of the display area of the OLED display panel, a solution of a silk-screen printing or transfer printing black frame can be mostly adopted for a small-size OLED. That is, a circle of black ink is printed on a surface of the packaging cover plate using a silk-screen printing or transfer printing method, so as to cover the metal traces on the periphery of the display area. For a medium and large OLED, since a minimum size of the display panel is more than ten inches and a maximum size is more than a hundred inches, silk-screen printing has numerous disadvantages that a halftone of a corresponding size requires to be additionally designed and has a short lifespan, ink is mostly solvent-based ink, curing and ink layer thinning are realized by means of self-volatilization or volatilization of a solvent by baking, overall process efficiency is low, and the silk-screen printing is unfriendly to the environment. Therefore, it is necessary to adopt an ink-jet printing method to print a circle of black ink and perform curing by means of irradiation using ultraviolet light. However, the ink-jet printing method also has a plurality of problems, including the following. 1) An ultra-thin ink layer is required, otherwise a step can be formed between the ink layer and the packaging cover plate, which is bad for attachment of a polarizer, and easily causes problems of bubbles generated between the polarizer and the packaging cover plate. 2) The ink layer is required to have high adhesion, otherwise it can easily fall off the packaging cover plate. It can be seen that, the method of directly spraying and printing the black ink on the packaging cover plate has strict requirements for ink selection, devices, and processes, causing an increase in costs of materials, devices, and processes. According to the embodiment of the present disclosure, a groove121is provided on a packaging cover plate110, a light-shielding layer122is disposed in the groove121. As a result, technical effects can be achieved as follows. (1) A thickness of the light-shielding layer122can be controlled, so that the surface of the packaging cover plate110remains flat, which is conducive to attachment of a polarizer40, thereby avoiding bubbles generated between the polarizer40and the packaging cover plate110after attachment. (2) Since the light-shielding layer122is disposed in the groove121and has a relatively low requirement for adhesion of the light-shielding layer122, the light-shielding layer122is not easy to fall off the groove121. (3) Due to the presence of the groove121, the thickness of the light-shielding layer122can be properly increased to enhance light-shielding performance of the light-shielding layer122. In the prior art, the method of spraying and printing black ink is to maintain the flatness of the surface of the packaging cover plate110, and the thickness of an ink layer cannot be too thick. Therefore, the light-shield performance of the ink layer is relatively poor. (4) The solutions of the present disclosure have relatively low requirements for materials, devices, and accuracy of processes, so that process costs are relatively low. (5) A selection range of the light-shielding layer122(such as ink or glue) and devices is widened, so as to ensure the safety of supply chains of materials and devices.

For example, a material of the packaging cover plate110is glass.

For example, a color of the light-shielding layer122is black to achieve a better shielding effect, thereby enhancing an all-black effect of the display device100.

Referring toFIG.2, the groove121can be provided around the second display area11to form a closed-loop structure. For example, the groove121can be in a rectangular shape.

For example, an absolute value of a height difference between a top surface of the light-shielding layer122and a surface of a side of the packaging cover plate110on which the groove121is provided is less than 5 μm. For example, an absolute value of a height difference between a top surface of the light-shielding layer122and a surface of a side of the packaging cover plate110on which the groove121is provided can be 4 μm, 3 μm, 2 μm, 1 μm, or 0 μm. Preferably, the height difference between the top surface of the light-shielding layer122and a surface of a side of the packaging cover plate110on which the groove121is provided is 0. That is, the top surface of the light-shielding layer122is flush with the surface of the side of the packaging cover plate110on which the groove121is provided, which facilitates the attachment of the polarizer40. According to the embodiment of the present disclosure, the groove121is provided on the packaging cover plate110, and the light-shielding layer122is disposed in the groove121, so as to improve the flatness of the surface of the packaging cover plate110, facilitate the attachment of the polarizer40, and improve an attachment effect. In this way, bubbles are not easily generated between the polarizer40and the packaging cover plate110after attachment.

For example, a thickness (H) of the packaging cover plate110can be in a range of 100 μm to 1000 μm, and a ratio of a depth (h) of the groove121to the thickness (H) of the packaging cover plate110can be in a range of 0.01 to 0.1. That is, 0.01 H≤h≤0.1 H. However, in order to guarantee the strength of the packaging cover plate110, when the thickness (H) of the packaging cover plate110is in the range of 500 μm to 1000 μm, the depth (h) of the groove121is preferably in the range of 5 μm to 30 μm. When the thickness (H) of the packaging cover plate110is in the range of 100 μm to 500 μm, the depth (h) of the groove121is preferably in the range of 5 μm to 10 μm.

For example, the distance between the groove121and the second display area11can be in a range of 100 μm to 400 μm, preferably 100 μm to 200 μm.

For example, the distance between the groove121and the outer edge of the second non-display area12can be in a range of 100 μm to 200 μm, preferably 100 μm to 150 μm.

For example, the width of the groove121can be in a range of 5 mm to 10 mm.

It can be understood that, when the absolute value of the height difference between the top surface of the light-shielding layer122and the surface of the side of the packaging cover plate110on which the groove121is provided is not 0, the top surface of the light-shielding layer122can be higher than the surface of the side of the packaging cover plate110on which the groove121is provided, or can be lower than the surface of the side of the packaging cover plate110on which the groove121is provided.

For example, the material of the light-shielding layer122can be ink or glue. Preferably, the ink is black, and the glue is black.

With reference toFIG.7, the first non-display area22of the display panel120can be sealingly connected to the second non-display area12of the packaging cover plate110using a frame sealing adhesive30, so as to form a sealed space, thereby preventing an OLED device211located in the first display area21from being corroded by water, oxygen, and the like.

Referring toFIG.1, the display device100further includes a polarizer40. The polarizer40is disposed on a side of the packaging cover plate110that is away from the display panel120. For example, the polarizer40is a circular polarizer.

Referring toFIG.4,FIG.4is a schematic diagram of a second structure of a display device according to an embodiment of the present disclosure. Compared with the display device100shown inFIG.1, in the display device100shown inFIG.4, a thin film encapsulation layer51can be further disposed on an outer surface of the OLED device211to further isolate water and oxygen. A desiccant52can further be disposed in an area formed by the frame sealing adhesive30on the display panel120. The desiccant52is disposed on a periphery of the OLED device211. In addition, filling glue53can be further disposed in a sealed space formed by the packaging cover plate110, the display panel120, and the frame sealing adhesive30in the display device100. The filling glue53covers the OLED device211encapsulated by the thin film encapsulation layer51and the desiccant52and fills the whole sealed space. In this way, the water and oxygen can be further isolated, and the service life of the OLED device211can be prolonged.

An embodiment of the present disclosure further provides a method for preparing a display device. The display device can be the display device100described in any above embodiment. Referring toFIGS.5to7,FIG.5is a flowchart of the method for preparing the display device according to an embodiment of the present disclosure,FIG.6is a schematic plan view of each process of the preparation method inFIG.5, andFIG.7is a schematic cross-sectional view of each process of the preparation method inFIG.5. The method for preparing a display device can include steps as follows.

S100: Provide a cover plate body10, wherein the cover plate body10has a second display area11and a second non-display area12.

For example, a material of the cover plate body10is glass.

S200: Form a groove121in the second non-display area12of the cover plate body

When the material of the cover plate body10is glass, the forming a groove121in the second non-display area12of the cover plate body10can include in detail: etching the cover plate body10, so as to form a groove121in the second non-display area12of the cover plate body10.

S300: Dispose a light-shielding layer122in the groove121to obtain a packaging cover plate110.

In some embodiments, the disposing a light-shielding layer122in the groove121can include: applying glue in the groove121using a glue dispenser.

For example, the glue dispenser can be a piezoelectric ceramic injection valve glue dispenser. A glue dispensing speed is in a range of 50 mm/s to 200 mm/s, and a viscosity of the glue is less than 10000 mPa·s (25° C.).

The glue can be selected from either a single type of black glue or two or more types of glue. For example, the glue can be a combination of the black glue and the glue in other colors or a combination of the black glue and transparent glue. In some embodiments, the glue (can be colorless transparent glue, black glue, or glue in other colors) that can improve the surface property of the groove121can be first applied at the bottom of the groove121, so as to enhance the adhesion of the surface of the groove121, and then the black glue is applied in the groove121to achieve a light-shielding effect.

In some embodiments, the material of the light-shielding layer122is glue. The light-shielding layer122is disposed in the groove121. A step of curing the light-shielding layer122is further provided. The method of curing is preferably curing by means of irradiation using ultraviolet light. A wave length of the ultraviolet light is in a range of 335 nm to 400 nm, and energy of the ultraviolet light is in a range of 1000 mJ/cm2 to 10000 mJ/cm2. The method of curing can further be moisture curing (20° C. to 25° C., 50% RH to 70% RH) or heat curing (40° C. to 100° C.). A height difference between a surface of a glue layer formed after glue curing and the surface of the cover plate body10is less than 5 μm. For example, the height difference between the surface of the glue layer and the surface of the cover plate body10is 4 μm, 3 μm, 2 μm, 1 μm, or 0 μm.

In some other embodiments, the disposing a light-shielding layer122in the groove121can include in detail: spraying ink in the groove121using an ink-jet printer.

For example, the ink-jet printer can be a piezoelectric ceramic ink-jet printer, and a viscosity of the ink can be in a range of 10 mPa·s to 20 mPa·s (25° C.).

The ink can be selected from either a single type of black ink or two or more types of ink. For example, the ink can be a combination of the black ink and the ink in other colors or a combination of the black ink and transparent ink. In some embodiments, the ink (can be colorless transparent ink, black ink, or ink in other colors) that can improve the surface property of the groove121can be first sprayed at the bottom of the groove121, so as to enhance the adhesion of the surface of the groove121, and then the black ink is sprayed in the groove121to achieve the light-shielding effect.

The disposing a light-shielding layer122in the groove121to obtain a packaging cover plate110can include in detail: disposing the light-shielding layer122in the groove121, wherein a material of the light-shielding layer122is ink, and curing the light-shielding layer122to obtain the packaging cover plate110. The method of curing is preferably curing by means of irradiation using ultraviolet light. A wave length of the ultraviolet light is in a range of 335 nm to 400 nm, and energy of the ultraviolet light is in a range of 500mJ/cm2to 5000 mJ/cm2. The method of curing can further be performing curing while printing, or performing curing after the ink is levelled. After curing, post-processing can be further performed on the ink. That is, baking and heating are performed on the cured ink at a temperature in a range of 40° C. to 100° C., so as to increase the adhesion between an ink layer and the cover plate body10and surface hardness of the ink layer. A height difference between the surface of the ink layer formed after curing of the ink and the surface of the cover plate body10is less than 5 μm. For example, the height difference between the surface of the ink layer and the surface of the cover plate body10is 4 μm, 3 μm, 2 μm, 1 μm, or 0 μm.

S400: Provide a display panel120, and combine the packaging cover plate110with the display panel120to obtain the display device100.

The display device100prepared using the above preparation method is shown inFIGS.1to4. Details will not be described herein again.

It should be noted that, inFIG.1,FIG.2,FIG.3,FIG.4,FIG.6, andFIG.7, dashed lines are merely used to represent a boundary between the first display area21and the first non-display area22or a boundary between the second display area11and the second non-display area12. The lines are not present in an actual product.

The display device and the method for preparing same provided in the embodiments of the present disclosure are described in detail above. The principles and implementations of the present disclosure are described by using specific examples in this specification, and the descriptions of the foregoing embodiments are merely used for helping understand the present disclosure. Meanwhile, a person of ordinary skill in the art can make modifications to the specific implementations and application range according to the ideas of the present disclosure. In conclusion, the content of the specification is not to be construed as a limitation to the present disclosure.