TWI845306B - Display device - Google Patents

Abstract

A display device includes a display panel, a diffusion layer, a supporting layer, and a cover layer. The display device is configured to emit light. The diffusion layer is separated from the display panel and is configured to diffuse the light. The supporting layer is disposed between the display panel and the diffusion layer. The cover layer is disposed on the diffusion layer, and the cover layer has a roughed surface on a side away from the display panel and is configured to diffuse the light.

Description

Display device

The present disclosure relates to a display device.

The display device can be applied to medical displays in operating rooms of medical institutions. How to come up with a display device that can optimize image clarity and ensure that the overall structure is sufficiently strong is one of the problems that the industry is eager to invest in research and development resources to solve.

In view of this, one purpose of the present disclosure is to provide a display device that can solve the above-mentioned problem.

To achieve the above object, according to one embodiment of the present disclosure, a display device includes a display panel, a diffusion layer, a support layer, and a cover layer. The display panel is configured to emit light. The diffusion layer is separated from the display panel and configured to diffuse the light. The support layer is disposed between the display panel and the diffusion layer. The cover layer is disposed on the diffusion layer, and the cover layer has a rough surface located on a side away from the display panel and configured to diffuse the light.

In one or more embodiments of the present disclosure, the roughness (Ra) of the rough surface is in the range between 0 micrometers (μm) and 0.7 micrometers (μm).

In one or more embodiments of the present disclosure, the root mean square slope (R∆q) of the rough surface is in the range between 0 and 0.2.

In one or more embodiments of the present disclosure, the diffusion layer further includes a prism and a misting layer.

In one or more embodiments of the present disclosure, the prism is located on a side of the diffusion layer close to the display panel, and the atomization layer is located on a side of the diffusion layer far from the display panel.

In one or more embodiments of the present disclosure, the prism sheet is located on a side of the diffusion layer far from the display panel, and the atomization layer is located on a side of the diffusion layer close to the display panel.

In one or more embodiments of the present disclosure, the field angle of light emitted by the display panel is less than 40 degrees.

In one or more embodiments of the present disclosure, the thickness of the support layer is in the range between 1 mm and 3 mm.

In one or more embodiments of the present disclosure, the sum of the thickness of the support layer, the thickness of the diffusion layer, and the thickness of the cover layer is greater than or equal to 1.5 mm.

In one or more embodiments of the present disclosure, the display device further includes an adhesive layer located between the cover layer and the diffusion layer.

In one or more embodiments of the present disclosure, the sum of the thickness of the cover layer and the thickness of the adhesive layer is less than 0.7 mm.

In summary, in the display device disclosed in the present invention, since it is provided with a support layer and a cover layer, the overall structural strength of the display device can be increased and large-area fragmentation caused by external force impact can be reduced. In the display device disclosed in the present invention, since the support layer is located between the display panel and the diffusion layer, when the light moves from the display panel toward the observer, the light can reach the diffusion layer more slowly and delay the diffusion of the light, thereby avoiding the observer's naked eye from observing a blurred image. In the display device disclosed in the present invention, when the light passes through the diffusion layer, the diffusion layer can expand the field of view of the light, thereby improving the brightness of the image of the display device when the observer observes it at a wide viewing angle (for example, a side viewing angle). In the display device disclosed in the present invention, since the diffusion layer includes a prism and an atomization layer, the problem of discontinuous brightness changes perceived by the observer when viewing the light at different viewing angles can be improved. Accordingly, the display device disclosed in the present invention can significantly improve the clarity of the image of the display device when the observer views the display device at a front viewing angle and a side viewing angle.

The above description is only used to explain the problem to be solved by the present disclosure, the technical means for solving the problem, and the effects produced, etc. The specific details of the present disclosure will be introduced in detail in the following implementation methods and related drawings.

The following will disclose multiple embodiments of the present disclosure with drawings. For the purpose of clarity, many practical details will be described together in the following description. However, it should be understood that these practical details should not be used to limit the present disclosure. In other words, in some embodiments of the present disclosure, these practical details are not necessary. In addition, in order to simplify the drawings, some commonly used structures and components will be depicted in the drawings in a simple schematic manner. The same reference numerals will be used to represent the same or similar components in all drawings.

In the drawings, for the sake of clarity, the thickness of layers, films, panels, regions, etc. is magnified. Throughout the specification, the same figure markings represent the same elements. It should be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" or "connected to" another element, it can be directly on or connected to another element, or an intermediate element can also exist. On the contrary, when an element is referred to as being "directly on" or "directly connected to" another element, there is no intermediate element. As used herein, "connection" can refer to physical and/or electrical connection. Furthermore, "electrical connection" or "coupling" can be the presence of other elements between two elements.

It should be understood that although the terms "first", "second", "third", etc. may be used herein to describe various elements, components, regions, layers and/or portions, these elements, components, regions, and/or portions should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or portion from another element, component, region, layer or portion. Therefore, the "first element", "component", "region", "layer" or "portion" discussed below can be referred to as a second element, component, region, layer or portion without departing from the teachings of this article.

The terms used herein are for the purpose of describing specific embodiments only and are not restrictive. As used herein, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms, including "at least one". "Or" means "and/or". As used herein, the term "and/or" includes any and all combinations of one or more of the relevant listed items. It should also be understood that when used in this specification, the terms "include" and/or "include" specify the presence and/or parts of the features, regions, entireties, steps, operations, elements, components and/or parts, but do not exclude the presence or addition of one or more other features, regions, entireties, steps, operations, elements, components and/or combinations thereof.

In addition, relative terms such as "below" or "bottom" and "above" or "top" may be used herein to describe the relationship of one element to another element, as shown in the figures. It should be understood that relative terms are intended to include different orientations of the device in addition to the orientation shown in the figures. For example, if the device in one figure is flipped, the elements described as being on the "below" side of the other elements will be oriented on the "above" side of the other elements. Therefore, the exemplary term "below" can include both "below" and "above" orientations, depending on the specific orientation of the figure. Similarly, if the device in one figure is flipped, the elements described as being "below" or "below" other elements will be oriented as being "above" other elements. Therefore, the exemplary term "below" or "below" can include both above and below orientations.

As used herein, "about", "approximately", or "substantially" includes the stated value and the average value within an acceptable deviation range of a particular value determined by a person of ordinary skill in the art, taking into account the measurement in question and the particular amount of error associated with the measurement (i.e., the limitations of the measurement system). For example, "about" can mean within one or more standard deviations of the stated value, or within ±30%, ±20%, ±10%, ±5%. Furthermore, as used herein, "about", "approximately", or "substantially" can select a more acceptable deviation range or standard deviation depending on the optical property, etching property or other property, and can apply to all properties without using a single standard deviation.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by ordinary technicians in the field to which the present invention belongs. It will be further understood that those terms as defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and the present invention, and will not be interpreted as an idealized or overly formal meaning unless expressly defined as such herein.

The structure, function and connection relationship between each component included in the display device 100 of the first embodiment of the present disclosure will be described in detail below.

Please refer to FIG. 1. FIG. 1 is a schematic cross-sectional view of a display device 100 according to an embodiment of the present disclosure. As shown in FIG. 1, a display device 100 is provided for displaying an image, so that an observer can view the image displayed by the display device 100 along a viewing direction VD through his naked eye NE. In this embodiment, the display device 100 includes a display panel 110, a support layer 120, a diffusion layer 130, and a cover layer 140. The display panel 110 is configured to emit light L to display an image. The support layer 120 is disposed on the display panel 110. The diffusion layer 130 is disposed on the support layer 120 and configured to diffuse the light L. Specifically, as shown in FIG. 1 , the support layer 120 is disposed between the display panel 110 and the diffusion layer 130, and the diffusion layer 130 is separated from the display panel 110 by the support layer 120. The cover layer 140 is disposed on the diffusion layer 130. The specific structures and functions of the display panel 110, the support layer 120, the diffusion layer 130 and the cover layer 140 will be described below.

Please refer to FIG. 2. FIG. 2 is a partial cross-sectional schematic diagram of a display device 100 according to one embodiment of the present disclosure. For the sake of simplicity, some components are omitted in FIG. 2. In the present embodiment, the display panel 110 is a collimating backlight module having the function of collimating light L. In some embodiments, the display panel 110 includes a prism, a reflector, a combination thereof, or other optical elements (not shown) having the function of collimating light L. In detail, as shown in FIG. 2, before the light L emitted by the display panel 110 enters the supporting layer 120 through the display panel 110, the light shape of the light L can be converged, so that when the light L subsequently enters the supporting layer 120, the field of view angle θ of the light L can be reduced to achieve the purpose of collimating the light L. In other words, the light L has a light exit angle greater than the viewing angle θ before reaching the support layer 120. Since the light L is collimated by the display panel 110, the image viewed by the naked eye NE along the viewing direction VD has better picture clarity.

In some embodiments, the light L emitted by the display panel 110 has a viewing angle θ (i.e., a light emission angle). In some embodiments, the viewing angle θ is less than 40 degrees. In some embodiments where the viewing angle θ of the light L is less than 40 degrees, the image viewed by the naked eye NE along the viewing direction VD has better clarity (for example, the outline of the picture or the font of the text in the image is clear without afterimage).

The display device 100 disclosed in the present invention can measure the viewing angle θ of the collimated light L by repeatedly using an optical instrument (e.g., a multi-angle optical measurement instrument) to perform a viewing angle measurement experiment, and generate a visual evaluation by the naked eye NE of the observer perceiving the image. For example, if the outline of the image or the font of the text in the image is clear without afterimages, the visual evaluation is "clear", whereas if the outline of the image or the font of the text in the image is unclear and afterimages appear, the visual evaluation is "blurred". In a specific embodiment, when the viewing angle θ measured for the collimated light L is greater than 60 degrees (i.e., greater than ±30 degrees), the visual evaluation is rated as "blurred" by the observer. In a specific embodiment, when the field angle θ measured for the collimated light L is about 50 degrees (i.e., about ±25 degrees), the visual evaluation is rated as “blurry” by the observer. In a specific embodiment, when the field angle θ measured for the collimated light L is less than 40 degrees (i.e., less than ±20 degrees), the visual evaluation is rated as “clear” by the observer.

In some embodiments, the display panel 110 may be, for example, a liquid crystal display (LCD), an organic light emitting diode display (OLED), a micro-LED display, or other suitable displays.

Please refer to FIG. 3. FIG. 3 is a partial cross-sectional schematic diagram of a display device 100 according to an embodiment of the present disclosure. For the sake of simplicity, some components are omitted in FIG. 3. In this embodiment, the diffusion layer 130 has the function of diffusing the light L. As shown in FIG. 3, when the light L emitted by the display panel 110 enters the diffusion layer 130, the field of view angle θ of the light L is expanded to achieve the purpose of expanding the field of view of the light L. In detail, the field of view of the light L can be expanded by the diffusion layer 130, so that the observer can perceive an image with sufficiently bright and good picture clarity even if it is not viewed at a straight-on angle (for example, the viewing direction VD shown in FIGS. 1 to 3). For example, an observer can obtain a sufficiently clear image even when viewing from a wide viewing angle (eg, a sideways viewing angle).

Please continue to refer to FIG. 3. In the present embodiment, the cover layer 140 has the function of providing protection for the display panel 110. Specifically, the cover layer 140 disposed above the display panel 110 can prevent the display device 100 from breaking when it intentionally or unintentionally falls to the ground or is hit by an external force. In the present embodiment, the cover layer 140 further has anti-glare and anti-reflection functions. Specifically, as shown in FIG. 3, the cover layer 140 has a rough surface 140a located on a side away from the display panel 110, and the rough surface 140a is configured to diffuse the light L. Specifically, when the light L passing through the diffusion layer 130 enters the cover layer 140, the field of view angle θ of the light L is expanded again, so as to achieve the purpose of expanding the field of view of the light L. In a usage scenario, since the field of view of the light L can be expanded by the cover layer 140, the observer can perceive a sufficiently bright image with good picture clarity even if the observer is not viewing at a straight angle (for example, the viewing direction VD shown in Figures 1 to 3). For example, the observer can also obtain a sufficiently bright and clear image when viewing at a wide viewing angle (for example, a side viewing angle). In addition, the provision of the cover layer 140 can also reduce the interference of glare on the observer's reading. In addition, because the display device 100 is provided with the cover layer 140 , when the observer uses, for example, a touch pen to press the display panel 110 , ripples on the surface of the display panel 110 due to the pressing can be avoided.

In some embodiments, the support layer 120 is a light-transmitting rigid material. In some embodiments, the support layer 120 can be, for example, flat glass or other suitable materials.

In some embodiments, the diffusion layer 130 may include beads, prisms, combinations thereof, or other suitable light diffusion structures.

In some embodiments, the cover layer 140 is a light-transmitting material. In some embodiments, the cover layer 140 can be, for example, glass, acrylic, resin or other suitable materials. In some embodiments, the cover layer 140 can be a transparent film containing the above materials. In some embodiments, the cover layer 140 is a light-transmitting material with high haze properties.

In some embodiments, as shown in FIG. 1 , the support layer 120 has a thickness T1, the diffusion layer 130 has a thickness T2, and the cover layer 140 has a thickness T3. In some embodiments, the thickness T1 is in a range between 1 mm and 3 mm. In some embodiments where the support layer 120 has a thickness T1 between 1 mm and 3 mm, the diffusion layer 130 is spaced a sufficient distance from the display panel 110 so that the light L does not diffuse prematurely before reaching the naked eye NE of the observer, thereby causing a problem of blurring the image or text. Specifically, although the diffusion of the light L through the diffusion layer 130 may cause the image or text to become blurred, since the support layer 120 has an appropriate thickness, even if the diffusion layer 130 slightly sacrifices the clarity of the image, it will not reduce the visual evaluation of the observer's naked eye NE. If the thickness T1 is less than 1 mm, the light L will diffuse prematurely before reaching the observer's naked eye NE, causing the image or text to become blurred. If the thickness T1 is greater than 3 mm, it will cause additional disadvantages such as the display device 100 being bulky and waste of materials.

In some embodiments, as shown in FIG. 1 , a thickness T4 is the sum of the thickness T1 of the support layer 120, the thickness T2 of the diffusion layer 130, and the thickness T3 of the cover layer 140. In some embodiments, the thickness T4 is greater than or equal to 1.5 mm. In some embodiments where the thickness T4 is greater than or equal to 1.5 mm, it not only provides sufficient protection for the display panel 110, but also takes into account the overall structural strength of the display device 100 and the clarity of the image.

In some embodiments, the roughness (arithmetic mean roughness; Ra) of the rough surface 140a is in the range of 0 micrometers (μm) and 0.7 micrometers (μm). In some embodiments, the root mean square slope (R∆q) of the rough surface 140a is in the range of 0 and 0.2. This can reduce the interference of glare on the reading of the observer, and prevent the light L from having an image clarity that does not meet the requirements due to the excessive roughness of the rough surface 140a.

With the above-mentioned structural configuration, since the support layer 120 is located between the display panel 110 and the diffusion layer 130, the overall structural strength of the display device 100 can be increased to reduce the breakage caused by external impact, and when the light L moves from the display panel 110 toward the observer, the light L can reach the diffusion layer 130 more slowly to delay the diffusion of the light L. Since the diffusion layer 130 can expand the field angle θ of the light L, the brightness of the image of the display device 100 observed by the observer at a side angle can be improved. Since the cover layer 140 has a rough surface 140a on the side away from the display panel 110, the field of view of the light L emitted by the display panel 110 is expanded, and anti-glare and anti-reflection effects are produced. Since the cover layer 140 and the support layer 120 serve as a support mechanism for the entire display device 100, it is possible to avoid large-area breakage of the cover layer 140 and the support layer 120 to damage the display panel 110.

Please refer to FIG. 4. FIG. 4 is a cross-sectional schematic diagram of a display device 100A according to an embodiment of the present disclosure. The structural configuration of the display device 100A shown in FIG. 4 is substantially similar to the structural configuration of the display device 100 shown in FIG. 1, except that the display device 100A further includes an adhesive layer 150, as shown in FIG. 4. In this embodiment, the adhesive layer 150 is disposed between the diffusion layer 130 and the cover layer 140. The cover layer 140 can be attached to the diffusion layer 130 via the adhesive layer 150.

In some embodiments, the adhesive layer 150 is a light-transmitting material. In some embodiments, the adhesive layer 150 can be, for example, optical clear adhesive (OCA) or other suitable adhesive materials.

In some embodiments, as shown in FIG. 4 , a thickness T5 is the sum of the thickness of the cover layer 140 and the thickness of the adhesive layer 150. In some embodiments, the thickness T5 is less than 0.7 mm. In some embodiments where the thickness T5 is less than 0.7 mm, it not only provides sufficient protection for the display panel 110, but also prevents the light L from being diffused due to the excessive thickness T5, which takes into account the overall structural strength of the display device 100 and the clarity of the image.

Please refer to FIG. 5. FIG. 5 is a cross-sectional schematic diagram of a display device 100B according to an embodiment of the present disclosure. The structural configuration of the display device 100B shown in FIG. 5 is substantially similar to the structural configuration of the display device 100A shown in FIG. 4, except that the diffusion layer 130 of the display device 100B further includes a prism 132 and a mist layer 134, as shown in FIG. 5. In this embodiment, the prism 132 of the display device 100B is located on a side of the diffusion layer 130 close to the display panel 110, and the mist layer 134 of the display device 100B is located on a side of the diffusion layer 130 away from the display panel 110. The prism 132 has the effect of expanding the field of view of the light L, and the provision of the mist layer 134 can solve the problem of drastic changes in the brightness of the image viewed by the naked eye NE at a wide viewing angle (e.g., side viewing angle) and at a narrow viewing angle (e.g., front viewing angle). In detail, the combination of the prism 132 and the mist layer 134 can achieve the effect that the brightness of the image can change continuously and smoothly as the viewing direction VD changes.

Please refer to FIG. 6. FIG. 6 is a cross-sectional schematic diagram of a display device 100C according to an embodiment of the present disclosure. The structural configuration of the display device 100C shown in FIG. 6 is substantially similar to the structural configuration of the display device 100B shown in FIG. 5, and the difference lies in the position distribution relationship between the prism 132 and the atomization layer 134 of the diffusion layer 130 of the display device 100C. As shown in FIG. 6, the prism 132 of the display device 100C is located on a side of the diffusion layer 130 away from the display panel 110, and the atomization layer 134 of the display device 100C is located on a side of the diffusion layer 130 close to the display panel 110.

Through the above-mentioned structural configuration of Figures 5 and 6, when the light L emitted from the display panel 110 passes through the diffusion layer 130 including the prism 132 and the atomization layer 134, the field of view of the light L is expanded and the brightness of the light L under the naked eye NE of the observer at a wide viewing angle is increased, so that when the observer observes at a side angle, for example, a clear and bright image can be obtained.

In some embodiments, the prism sheet 132 may include, for example, a plurality of micro-prisms or other suitable light-diffusing microstructures.

In some embodiments, the atomizing layer 134 may include, for example, a plurality of microparticles or other suitable light diffusion microstructures. In some embodiments, the atomizing layer 134 may be, for example, atomizing glue or other suitable light diffusion elements.

In some embodiments, the diffusion layer 130 may be a ductile extruded film. In some embodiments, the substrate of the diffusion layer 130 may be, for example, polyethylene terephthalate (PET), acrylic, or other suitable light-transmitting materials.

In summary, the display device 100, the display device 100A, the display device 100B and the display device 100C as the multiple embodiments of the present disclosure can not only enable the observer to perceive sufficiently bright and clear images at any viewing angle, but also achieve the purpose of aesthetics and collision prevention.

From the above detailed description of the specific implementation of the present disclosure, it can be clearly seen that in the display device of the present disclosure, since it is provided with a support layer and a cover layer, the overall structural strength of the display device can be increased and large-area fragmentation caused by external impact can be reduced. In the display device of the present disclosure, since the support layer is located between the display panel and the diffusion layer, when light moves from the display panel toward the observer, the light can reach the diffusion layer more slowly and delay the diffusion of the light, thereby preventing the observer's naked eyes from observing a blurred image. In the display device disclosed in the present invention, when light passes through the diffusion layer, the diffusion layer can expand the field of view of the light, thereby improving the brightness of the image of the display device when the observer observes it at a wide viewing angle (for example, a side viewing angle). In the display device disclosed in the present invention, since the diffusion layer includes a prism and a fogging layer, the problem of discontinuous brightness changes perceived by the observer when the light is viewed at different viewing angles can be improved. Accordingly, the display device disclosed in the present invention can significantly improve the clarity of the image of the display device when the observer observes it at a straight viewing angle and a side viewing angle.

Although the present disclosure has been disclosed in the above implementation form, it is not intended to limit the present disclosure. Anyone skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be determined by the scope of the attached patent application.

100, 100A, 100B, 100C: display device 110: display panel 120: support layer 130: diffusion layer 132: prism 134: atomization layer 140: cover layer 140a: rough surface 150: adhesive layer L: light NE: naked eye T1, T2, T3, T4, T5: thickness VD: viewing direction θ: field of view

In order to make the above and other purposes, features, advantages and embodiments of the present disclosure more clearly understandable, the attached drawings are described as follows: FIG. 1 is a schematic cross-sectional view of a display device according to one embodiment of the present disclosure. FIG. 2 is a schematic cross-sectional view of a portion of a display device according to one embodiment of the present disclosure. FIG. 3 is a schematic cross-sectional view of a portion of a display device according to one embodiment of the present disclosure. FIG. 4 is a schematic cross-sectional view of a display device according to one embodiment of the present disclosure. FIG. 5 is a schematic cross-sectional view of a display device according to one embodiment of the present disclosure. FIG. 6 is a schematic cross-sectional view of a display device according to one embodiment of the present disclosure.

Domestic storage information (please note in the order of storage institution, date, and number) None Foreign storage information (please note in the order of storage country, institution, date, and number) None

100B: Display device

110: Display panel

120: Support layer

130: Diffusion layer

132: Prism

134: Atomization layer

140: Covering layer

150: Adhesive layer

L: Light

NE: Naked eye

VD: Viewing Direction

Claims (9)

A display device includes: a display panel configured to emit light; a diffusion layer separated from the display panel and configured to diffuse the light, wherein the diffusion layer further includes a prism and a mist layer, the prism is located on a side of the diffusion layer close to the display panel, and the mist layer is located on a side of the diffusion layer away from the display panel; a support layer is arranged between the display panel and the diffusion layer; and a cover layer is arranged on the diffusion layer, and the cover layer has a rough surface located on a side away from the display panel and is configured to diffuse the light. A display device as described in claim 1, wherein a roughness (Ra) of the rough surface is in a range between 0 micrometers and 0.7 micrometers. A display device as claimed in claim 1, wherein a root mean square slope (R△q) of the rough surface is in a range between 0 and 0.2. A display device comprises: a display panel configured to emit light; a diffusion layer separated from the display panel and configured to diffuse the light, wherein the diffusion layer further comprises a prism and a mist layer, the prism is located on a side of the diffusion layer away from the display panel, and the mist layer is located on a side of the diffusion layer close to the display panel; a support layer is arranged between the display panel and the diffusion layer; and a cover layer is arranged on the diffusion layer, and the cover layer has a rough surface located on a side away from the display panel and configured to diffuse the light. A display device as described in claim 4, wherein the field of view angle of the light emitted by the display panel is less than 40 degrees. A display device as described in claim 4, wherein a thickness of the support layer is in a range between 1 mm and 3 mm. A display device as described in claim 4, wherein the sum of the thickness of the support layer, the thickness of the diffusion layer, and the thickness of the cover layer is greater than or equal to 1.5 mm. The display device as described in claim 4 further comprises an adhesive layer located between the cover layer and the diffusion layer. A display device as described in claim 8, wherein the sum of the thickness of the covering layer and the thickness of the adhesive layer is less than 0.7 mm.

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