Indication device

Abstract

The present invention provides a display device in which the bezel and front panel are bonded together with an adhesive material, and the bonded joint is not noticeable. [Solution] A display device comprising: a display panel; a housing that houses the display panel and has a bezel positioned around the display panel in a plan view; a front panel positioned on the observation surface side of the display panel and overlapping with at least a portion of the display panel and the bezel in a plan view; and an adhesive member positioned between the bezel and the front panel, wherein there is an air layer between the display panel and the front panel, the absolute difference between the SCI of the region overlapping with the display panel in a plan view and the SCI of the region overlapping with the bezel in a plan view is 3.0% or less, and the absolute difference between the SCE of the region overlapping with the display panel in a plan view and the SCE of the region overlapping with the bezel in a plan view is 3.0% or less.

Description

[Technical Field]

[0001] This disclosure relates to a display device. [Background technology]

[0002] In recent years, there has been research into improving the design of display devices that show a desired image when the display screen is lit, by making the display panel less conspicuous and harmonizing with surrounding components and casings when the display device is not lit.

[0003] For example, Patent Document 1 discloses a printed material comprising a base film, a first color pattern layer provided on the base film consisting of a plurality of first color dots, a second color pattern layer provided on the first color pattern layer consisting of a plurality of second color dots, and a third color pattern layer provided on the second color pattern layer consisting of a plurality of third color dots, wherein each of the first color dots comprises a first color binder and a plurality of first color pigment chips dispersed inside the first color binder, and each of the second color dots comprises a second color binder and a plurality of third color pigment chips dispersed inside the third color binder, wherein each of the first color pigment chips, second color pigment chips and third color pigment chips is one of a red interference pigment, a green interference pigment and a blue interference pigment that produce color as interference light on the reflected light side, and the printed material is disclosed to be used in a display device. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Patent No. 5725581 [Patent Document 2] Patent No. 4184711 [Overview of the project] [Problems that the invention aims to solve]

[0005] The printed material in Patent Document 1 has a translucent smoke printing layer, which may result in low transmittance when bonded to a display device. Furthermore, conventionally, when the front panel and the housing bezel are bonded together with an adhesive layer, the appearance differs between the bonded area with the adhesive layer and the unbonded area without the adhesive layer, making the bonded area stand out.

[0006] The present invention aims to provide a display device in which the joint between the bezel and the front panel, where they are bonded together with an adhesive material, is not noticeable. [Means for solving the problem]

[0007] (1) One embodiment of the present invention is a display device comprising: a display panel; a housing that houses the display panel and has a bezel positioned around the display panel in a plan view; a front panel positioned on the observation surface side of the display panel and overlapping with at least a portion of the display panel and the bezel in a plan view; and an adhesive member positioned between the bezel and the front panel, wherein there is an air layer between the display panel and the front panel, and the reflectance of the region overlapping with the display panel in a plan view measured from the front panel side using the SCI method is α1, the reflectance of the region overlapping with the bezel in a plan view measured from the front panel side using the SCI method is β1, the reflectance of the region overlapping with the display panel in a plan view measured from the front panel side using the SCE method is α2, and the reflectance of the region overlapping with the bezel in a plan view measured from the front panel side using the SCE method is β2, the absolute value of the difference between α1 and β1 is 3.0% or less, and the absolute value of the difference between α2 and β2 is 3.0% or less.

[0008] (2) One embodiment of the present invention is a display device that, in addition to the configuration of (1) above, has an absolute value of the difference between α1 and β1 that is 1.5% or less, and an absolute value of the difference between α2 and β2 that is 1.5% or less.

[0009] (3) One embodiment of the present invention is a display device in which, in addition to the configuration of (1) or (2) above, the adhesive member has a light-absorbing layer and a reflective metal layer.

[0010] (4) One embodiment of the present invention is a display device in which, in addition to the configuration of (3) above, the adhesive member has, from the observation surface side, the light absorbing layer and the reflective metal layer in that order.

[0011] (5) One embodiment of the present invention is a display device in which, in addition to any of the configurations of (1) to (4) above, the surface of the adhesive member on the observation surface side is composed of a first adhesive layer.

[0012] (6) One embodiment of the present invention is a display device in which, in addition to any of the configurations (1) to (5) above, the back surface of the adhesive member is composed of a second adhesive layer.

[0013] (7) One embodiment of the present invention is a display device in which, in addition to any of the configurations of (1) to (6) above, the reflectance of β2 with respect to β1 is less than 5%.

[0014] (8) One embodiment of the present invention is a display device in which, in addition to any of the configurations (1) to (7) above, the adhesive member is arranged to overlap with a part of the bezel in a plan view.

[0015] (9) One embodiment of the present invention is a display device in which, in addition to any of the configurations (1) to (8) above, the adhesive member is arranged to overlap the entire surface of the bezel in a plan view.

[0016] (10) One embodiment of the present invention is a display device in which, in addition to any of the configurations described in (1) to (9) above, a part of the adhesive member overlaps with a part of the display panel in a plan view.

[0017] (11) One embodiment of the present invention is a display device in which, in addition to any of the configurations of (1) to (10) above, the adhesive member has a light-shielding layer.

[0018] (12) An embodiment of the present invention is a display device, in addition to any of the configurations of (1) to (11) above, wherein the front panel has a design layer.

[0019] (13) An embodiment of the present invention is a display device, in addition to any of the configurations of (1) to (12) above, wherein the front panel has a total light transmittance of 5% or more.

[0020] (14) An embodiment of the present invention is a display device, in addition to any of the configurations of (1) to (13) above, which is capable of local dimming driving.

Advantages of the Invention

[0021] According to the present invention, it is possible to provide a display device in which the bonding portion where the bezel and the front panel are bonded together by the adhesive member is not conspicuous.

Brief Description of the Drawings

[0022] [Figure 1] It is a plan schematic view of the display device according to Embodiment 1. [Figure 2] It is a cross-sectional schematic view taken along the line X1 - X2 of FIG. 1. [Figure 3] In FIG. 2, it is an enlarged cross-sectional schematic view of the bonding portion between the bezel and the front panel surrounded by a dotted line. [Figure 4] It is a cross-sectional schematic view showing the first example 400A of the adhesive member that can be used in Embodiment 1. [Figure 5] It is a cross-sectional schematic view showing the second example 400B of the adhesive member that can be used in Embodiment 1. [Figure 6] It is a cross-sectional schematic view showing the third example 400C of the adhesive member that can be used in Embodiment 1. [Figure 7] It is a plan schematic view showing an example of the arrangement of the adhesive member 400 in the display device according to Embodiment 1. [Figure 8] It is a plan schematic view showing another example of the arrangement of the adhesive member 400 in the display device according to Embodiment 1. [Figure 9]This is a schematic plan view showing a modified example of Embodiment 1, illustrating the case where an image is displayed on a display device capable of local dimming. [Figure 10] This is a schematic cross-sectional view showing a fourth example 400D of an adhesive member that can be used in Embodiment 2. [Figure 11] This is a schematic cross-sectional view showing a fifth example 400E of an adhesive member that can be used in Embodiment 2. [Figure 12] This is a schematic cross-sectional view showing a sixth example of an adhesive member, 400F, that can be used in Embodiment 2. [Figure 13] This is a schematic plan view of the display device according to Embodiment 2. [Figure 14] This is a schematic cross-sectional view showing an enlarged view of the area around the adhesive portion between the bezel 310 and the front panel 110 of the display device according to Embodiment 2. [Figure 15] This is a schematic cross-sectional view of the display device according to Embodiment 3. [Figure 16] This is a schematic plan view of the display device according to Embodiment 3. [Figure 17] This is a schematic plan view of a conventional display device relating to comparative form 1. [Figure 18] This is a schematic cross-sectional view of a conventional display device relating to Comparative Embodiment 1. [Figure 19] Figure 18 is a schematic, enlarged cross-sectional view illustrating ambient light reflection in the area enclosed by the dotted line. [Figure 20] This is a schematic plan view of a conventional display device relating to comparative form 2. [Figure 21] This is a schematic cross-sectional view of a conventional display device relating to comparative form 2. [Figure 22] Figure 21 is a schematic, enlarged cross-sectional view illustrating ambient light reflection in the area enclosed by the dotted line. [Figure 23] This is a schematic plan view of a conventional display device relating to comparative form 3. [Figure 24] This is a schematic cross-sectional view of a conventional display device relating to comparative form 3. [Figure 25] Figure 24 is a schematic, enlarged cross-sectional view illustrating ambient light reflection in the area enclosed by the dotted line. [Figure 26]This is a schematic plan view illustrating a conventional display device in which the front panel includes a design layer. [Figure 27] This is a schematic cross-sectional view of the adhesive material fabricated in Experimental Example 2. [Figure 28] These are schematic cross-sectional diagrams of the display devices using adhesive members in Experimental Examples 1 and 2. [Modes for carrying out the invention]

[0023] Embodiments are listed below, and the present invention will be described in more detail with reference to the drawings, but the present invention is not limited to these embodiments. In the following description, the same reference numerals are used in common across different drawings for the same parts or parts having similar functions, and repeated descriptions are omitted as appropriate. Each aspect of the present invention may be combined as appropriate without departing from the spirit of the invention.

[0024] In this specification, two directions (planes) are considered orthogonal if the angle between them is preferably within the range of 90°±3°, more preferably within the range of 90°±1°, and even more preferably within the range of 90°±0.5°. Furthermore, two directions (planes) are considered parallel if the angle between them is preferably within the range of 0°±3°, more preferably within the range of 0°±1°, and even more preferably within the range of 0°±0.5°.

[0025] In this specification, the "observation side" refers to the side of the object closer to the observer when the object is positioned facing the observer, and the "back side" refers to the side of the object further away from the observer. In this specification, "plan view" refers to the view from the observation side.

[0026] In this specification, "the display device is lit" means that light is emitted from the observation surface side of the display device. If the display panel is a liquid crystal panel, this means that the backlight located on the back side of the liquid crystal panel is lit and the liquid crystal panel transmits light (white display state). If the display panel is a self-emissive panel such as an OLED, this means that the display panel is lit. "The display device is not lit" means that no light is emitted from the observation surface side of the display device. If the display panel is a liquid crystal panel, this means that the backlight is off, and in the case of a display device equipped with a backlight capable of local dimming, this means that the backlight corresponding to the area of ​​the display panel that does not display an image (black display area) is off. If the display panel is a self-emissive panel such as an OLED, this means that the display panel is off.

[0027] <Embodiment 1> Figure 1 is a schematic plan view of a display device according to Embodiment 1. Figure 2 is a schematic cross-sectional view along the line X1-X2 in Figure 1. Figure 3 is a schematic cross-sectional view showing an enlarged view of the bonding portion between the bezel and the front panel enclosed by the dotted line in Figure 2. The display device 1 according to this embodiment comprises a display panel 100, a housing 300 that houses the display panel and has a bezel 310 arranged around the display panel 100 in a plan view, a front panel 110 arranged on the observation surface side of the display panel 100 and overlapping at least a portion of the display panel 100 and the bezel 310 in a plan view, and an adhesive member 400 arranged between the bezel 310 and the front panel 110. Furthermore, there is an air layer 400a between the display panel 100 and the front panel 110.

[0028] (Enclosure) As shown in Figure 2, the display device 1 includes a housing 300 that houses the display panel 100. The housing 300 includes a bottom portion 320 and a bezel 310 that is provided around the bottom portion 320 and protrudes toward the observation surface. In a plan view, the bottom portion 320 overlaps with the display panel 100, and the bezel 310 is positioned around the display panel 100. For example, by placing an adhesive member 400 on the back side of the front panel 110 that overlaps with the frame area 1NA, and attaching the adhesive member 400 to the bezel 310, the front panel 110 can be fixed to the housing 300. Preferably, the surface of the bezel 310 toward the observation surface is horizontal, and the front panel 110 is attached to this horizontal surface by the adhesive member 400.

[0029] The housing 300 may house a circuit board (not shown) on which a drive circuit for driving the display panel 100 and the backlight 200 is formed. The housing 300 is not particularly limited as long as it can house the display panel 100 and the front panel 110, and may be made of metal or resin. The shape of the housing 300 is not limited to a box shape with an open top as shown in Figure 2. Also, the bottom 320 and the bezel 310 may be integrally molded.

[0030] (Display panel) As shown in Figure 1, the display panel 100 has a display area 1AA and a frame area 1NA arranged around the display area 1AA in a plan view. The frame area 1NA is the area that overlaps with the bezel 310 in a plan view and is not involved in the display of images or the like by the display device. The display area 1AA is the area that overlaps with the display panel 100 in a plan view. Specifically, the display area 1AA is an area that contains multiple pixels and is the area where the desired image or the like is displayed during transparent display.

[0031] Examples of the display panel 100 include self-emissive panels such as liquid crystal panels and OLED panels. An example of a liquid crystal panel is a configuration comprising a pair of substrates and a liquid crystal layer containing liquid crystal molecules, sandwiched between the pair of substrates. The pair of substrates may be a TFT substrate having multiple switching elements such as thin-film transistors (TFTs) and a counter substrate. The TFT substrate or the counter substrate may have color filters such as red, green, and blue that overlap with the pixels described later.

[0032] The TFT substrate has gate wiring and source wiring that intersects the gate wiring on a support substrate, with the TFT placed near the intersection of the gate wiring and source wiring, and pixel electrodes electrically connected to the TFT placed thereon. The region enclosed by the gate wiring and source wiring is a pixel, and the color filter is placed so as to overlap each pixel.

[0033] A common electrode is placed on the TFT substrate or the opposing substrate. By applying a predetermined voltage between the pixel electrode and the opposing electrode, an electric field is generated in the liquid crystal layer, controlling the orientation of the liquid crystal molecules to adjust the amount of light transmitted from the backlight 200 to the liquid crystal panel, thereby enabling transmitted display.

[0034] The liquid crystal panel has a pair of polarizers on the observation side and the back side. The pair of polarizers may be absorption-type linear polarizers having a transmission axis that transmits only light in a specific polarization direction and an absorption axis perpendicular to the transmission axis. The pair of polarizers are arranged, for example, in a crossed nicol configuration so that their transmission axes are perpendicular to each other. In addition, an alignment film may be placed between the TFT substrate and the liquid crystal layer, and between the liquid crystal layer of the opposing substrate, to control the orientation of liquid crystal molecules when no voltage is applied.

[0035] Examples of the self-illuminating panels mentioned above include OLED panels containing multiple organic light-emitting diodes (OLEDs). These self-illuminating panels are panels that can emit light themselves, equipped with light-emitting elements such as OLEDs inside the panel, and can emit light towards the observation surface without requiring an external light source such as a backlight.

[0036] The configuration of the organic light-emitting diode described above is not particularly limited, and examples include a cathode, light-emitting layer, and anode stacked in that order. The light-emitting layer may contain fluorescent materials, phosphorescent materials, etc. as light-emitting materials. An electron transport layer may be placed between the cathode and the light-emitting layer, and a hole transport layer may be placed between the light-emitting layer and the anode.

[0037] Light-emitting elements such as OLEDs may be arranged in a matrix on a substrate on which gate wiring, source wiring, TFTs, etc., are formed, with each TFT (each pixel) being arranged in a matrix. In an OLED panel, the area where multiple light-emitting elements are arranged becomes the display area. The multiple light-emitting elements may include red light-emitting elements, green light-emitting elements, and blue light-emitting elements. From the viewpoint of reducing internal reflectivity, a self-emissive panel may have a circular polarizer on the front panel side (front side).

[0038] On the front side of the display panel 100, an anti-reflective film may be placed in front of the polarizing plates, such as the linear polarizing plate and circular polarizing plate mentioned above. Examples of known anti-reflective films include AR film (Anti-Reflection Film) and AG film (Anti-Glare Film). For example, an AR film manufactured by Dai Nippon Printing Co., Ltd. can be used as an AR film. For example, an AG film manufactured by Dai Nippon Printing Co., Ltd. can be used as an AG film.

[0039] (Front plate) The front panel 110 is a component positioned on the front side (observation side) of the display panel 100 and transmits at least a portion of the light incident from the display panel 100. Preferably, the front panel 110 includes a transparent substrate (transparent substrate 111, described later).

[0040] As the transparent substrate mentioned above, for example, resin sheets such as acrylic or polycarbonate, or glass sheets can be used. The transparent substrate may be flat or curved.

[0041] From the viewpoint of maintaining high brightness of the display device, the transparent substrate described above preferably has high transmittance, for example, a transmittance of 90% or more. Furthermore, from the viewpoint of suppressing blurring of the displayed image, the transparent substrate described above preferably has a haze of 10% or less. In this specification, transmittance refers to total light transmittance and is measured by a method in accordance with JIS K 7361-1:1997. The total light transmittance described above is the total light transmittance in the visible light region (for example, wavelength 380 nm to 780 nm). The haze described above is measured by a method in accordance with JIS K 7136:2000. The total light transmittance described above can be measured using, for example, a turbidimeter "HazeMeter NDH2000" manufactured by Nippon Denshoku Industries Co., Ltd. The haze described above can be measured using, for example, a turbidimeter "HazeMeter NDH2000" manufactured by Nippon Denshoku Industries Co., Ltd.

[0042] The transmittance of the area of ​​the front panel 110 that overlaps with the display area 1AA is preferably 50% or more. By adopting this configuration, the display device 1 can perform transparent display while maintaining high brightness. If the transmittance of the area of ​​the front panel 110 that overlaps with the display area 1AA is less than 50%, the brightness of the display device 1 will decrease, and the displayed image may become difficult to see in bright environments. The transmittance of the area of ​​the front panel 110 that overlaps with the display area 1AA is more preferably 70% or more. The upper limit of the transmittance of the front panel 110 is, for example, 90%.

[0043] The front panel 110 preferably has a total light transmittance of 5% or more. As will be described later, the front panel 110 may include regions with different transmittances in the in-plane direction, but it is preferable that the total light transmittance of the region with the lowest transmittance of the front panel 110, including the region overlapping with the frame region 1NA and the region overlapping with the display region 1AA, be 5% or more. In other words, it is preferable that the front panel 110 does not have a frame printing section or structure that completely blocks light from the frame region 1NA of the display panel in a plan view. The frame printing section mentioned above is, for example, a light-shielding layer formed with black ink. As will be described later, a transparent design layer may be provided, but even if a design layer is provided, it is preferable that the total light transmittance of the region with the lowest transmittance of the front panel 110 be 5% or more.

[0044] As shown in Figure 3, an adhesive member 400 is placed between the bezel 310 and the front panel 110. The bezel 310 and the front panel 110 may be directly bonded together by the adhesive member 400, or they may be bonded together via the adhesive member 400 and other adhesive layers, double-sided tape, etc. When directly bonded together by the adhesive member 400, it is preferable that the adhesive member 400 has additional adhesive layers on its front and back sides, as will be described later. In this case, it is preferable that the front side of the adhesive member 400 is in contact with the front panel 110, and the back side of the adhesive member 400 is in contact with the bezel 310. The bezel 310 and the front panel 110 may be bonded together via the adhesive member 400 and other adhesive layers, double-sided tape, etc., but it is preferable that at least the front side of the adhesive member 400 is in contact with the front panel 110. The front panel 110 has a larger area than the display panel 100 in a plan view, and is bonded to the bezel 310 in the portion that extends beyond the display panel in a plan view.

[0045] In Figure 3, the surface reflectance of the adhesive member 400 is shown by A, the surface reflectance of the display panel 100 is shown by B, the interface reflectance between the front panel 110 and the air layer 400a is shown by C, and the surface reflectance of the bezel 310 in the non-bonded portion is shown by D. In the frame region 1NA, in the bonded portion where the adhesive member 400 is placed on the bezel 310, the boundary between the bonded portion and the non-bonded portion can be made less visible by adjusting the surface reflectance of the adhesive member 400 so that A = B + C. If B and C are specular reflectors, then by making A also close to specular reflectors, the reflective characteristics, including the angular characteristics, can be made equivalent, and the bonded portion can be made even less noticeable. In the non-bonded areas on the bezel 310 where no adhesive material 400 is placed, the boundary between the bonded area where the bezel 310 and the front panel 110 are bonded together by the adhesive material 400 and the display area 1AA can be made less visible by adjusting the color and reflectivity of the bezel 310 so that C+B=C+D, or B=D.

[0046] If we define α1 as the reflectance measured from the front panel 110 side using the SCI method in the area overlapping with the display panel 100 in a plan view, β1 as the reflectance measured from the front panel 110 side using the SCI method in the area overlapping with the bezel 310 in a plan view, α2 as the reflectance measured from the front panel 110 side using the SCE method in the area overlapping with the display panel in a plan view, and β2 as the reflectance measured from the front panel 110 side using the SCE method in the area overlapping with the bezel 310 in a plan view, then the absolute difference between α1 and β1 (|α1-β1|) is 3.0% or less, and the absolute difference between α2 and β2 (|α2-β2|) is 3.0% or less. Note that the area overlapping with the bezel 310 in a plan view refers to the bonded portion on the bezel 310 where the adhesive member 400 is placed in a plan view. By setting the absolute difference between the reflectance of the display area and the reflectance of the laminated part of the frame area, measured using the SCI and SCE methods, to 3.0% or less, the boundary between the display area and the laminated part can be made less noticeable.

[0047] The reflectance measured by the SCE method (hereinafter also referred to as SCE) is the reflectance after removing specular reflection and is also called diffuse reflectance. The reflectance measured by the SCI method (hereinafter also referred to as SCI) is the reflectance including specular reflection. SCE and SCI can be measured using, for example, a Konica Minolta CM-700d, and can be measured in accordance with JIS Z 8722:2009. In this specification, reflectance and transmittance refer to reflectance and transmittance in the visible light region (wavelength 380 nm to 780 nm).

[0048] The SCE of the display area can be adjusted by, for example, the surface roughness, haze, etc., of layers, materials, etc., placed on the front side of the display panel 100, and the larger the surface roughness, haze, etc., the higher the SCE of the display area tends to be. For example, if an AG film or the like is placed on the display panel 100 to perform anti-glare treatment, the SCE of the display area tends to be higher than when no anti-glare treatment is performed, but regardless of whether or not the surface treatment of the display panel is performed, it is preferable that the above |α1-β1| and |α2-β2| are 3.0% or less. The SCI of the display area can be lowered by, for example, placing an AR film or the like on the display panel 100, which can lower both SCI and SCE.

[0049] The SCE and SCI of the frame region can be adjusted by adjusting the SCE and SCI of the adhesive member 400. For example, if the adhesive member 400 has a reflective metal layer 403 (described later), the SCE and SCI of the frame region can be increased by increasing the reflectivity of the reflective metal layer 403. Also, if the surface roughness of the reflective metal layer 403 is large, the SCE of the frame region tends to be high. If the adhesive member 400 has a light-absorbing layer 402 (described later), the SCE and SCI of the frame region can be increased by increasing the total light transmittance of the light-absorbing layer 402. If the adhesive member 400 has a base material 402 (described later), the SCE and SCI of the frame region can be increased by increasing the total light transmittance of the base material 402. Also, if the haze of the base material 402 is high, the SCE of the frame region tends to be high. In non-bonded areas where the adhesive member 400 is not placed, the SCE and SCI of the frame region can also be adjusted by bringing the reflection of the bezel 310 closer to specular reflection.

[0050] Preferably, |α1-β1| is 1.5% or less, and |α2-β2| is 1.5% or less. This configuration makes the boundary between the display area and the bonded portion less noticeable.

[0051] The reflectance of β2 relative to β1 (β2 / β1) × 100 [%] is preferably less than 5.0%. If the reflectance of β2 relative to β1 is less than 5%, the reflection of the bonded portion where the adhesive member 400 is placed on the bezel 310 (reflectance A explained in Figure 3) will be close to specular reflection. For example, if the front panel 110 and the observation surface side material of the display panel 100 are glass or the like, the reflectances B and C explained in Figure 3 will be almost specular reflection. Therefore, by bringing the reflection of the bonded portion closer to specular reflection, the reflective characteristics of the display area and the bonded portion can be made equivalent, including the angular characteristics, and the bonded portion can be made less noticeable. The reflectance of β2 relative to β1 is more preferably 3.0% or less.

[0052] The adhesive members that can be used in Embodiment 1 are described below. Specifically, adhesive members 400A to 400C are described below, but unless otherwise specified, they will be referred to as adhesive member 400. Figure 4 is a schematic cross-sectional view showing the first example 400A of the adhesive members that can be used in Embodiment 1. Figure 5 is a schematic cross-sectional view showing the second example 400B of the adhesive members that can be used in Embodiment 1. Figure 6 is a schematic cross-sectional view showing the third example 400C of the adhesive members that can be used in Embodiment 1.

[0053] The adhesive member 400 of Embodiment 1 has a light-absorbing layer 402 and a reflective metal layer 403. The light-absorbing layer 402 is semi-transparent and transmits a portion of the light incident from the observation surface side and the back side, while absorbing the other light. The reflective metal layer 403 is a layer that reflects at least a portion of the light incident from the observation surface side. By having the reflective metal layer 403 in the adhesive member 400, the SCE and SCI of the bonded portion can be increased. Furthermore, by having the light-absorbing layer 402 in the adhesive member 400, the SCE and SCI of the adhesive member 400 can be lowered compared to the case where only the reflective metal layer 403 is present, and the above SCE and SCI can be adjusted to a desired range.

[0054] The adhesive member 400 preferably has a light-absorbing layer 402 and a reflective metal layer 403 in that order from the observation surface side. By arranging the light-absorbing layer 402 in front of the reflective metal layer 403, the amount of light incident on the reflective metal layer 403 and the amount of light reflected by the reflective metal layer 403 and transmitted through the light-absorbing layer 402 can be reduced, thereby adjusting the SCE and SCI of the adhesive member 400.

[0055] The reflective metal layer 403 is formed from a reflective metal. The material for the reflective metal layer 403 is preferably one that can be formed as a thin film, such as aluminum, silver, chromium, nickel, tantalum, tungsten, or alloys thereof.

[0056] The reflective metal layer 403 can be formed, for example, by sputtering, vapor deposition, chemical vapor deposition (CVD), etc. Among these, it is preferable to form it by sputtering. As will be described later, the adhesive member 400 may have a base material 404, and if the adhesive member 400 has a base material 404, the reflective metal layer 403 may be formed on the base material 404.

[0057] The reflectance (specular reflectance) of the reflective metal layer 403 is preferably 40% or more, more preferably 60% or more, and even more preferably 80% or more. The reflectance of the reflective metal layer 403 can be measured using, for example, a Konica Minolta CM-700d, and can be measured in accordance with the method compliant with JIS Z 8722. The reflectance of the reflective metal layer 403 can be adjusted by the type of metal used, its thickness, surface roughness, etc.

[0058] The thickness of the reflective metal layer 403 is preferably, for example, 30 nm or more and 300 nm or less, and more preferably 70 nm or more and 150 nm or less. Although not shown in the figures, the reflective metal layer 403 may also serve as the base material 404. For example, if the reflective metal layer 403 is aluminum foil or the like, the reflective metal layer 403 can also serve as the base material 404. When the reflective metal layer 403 also serves as the base material 404, the thickness of the reflective metal layer 403 is preferably 6 μm or more and 200 μm or less, and more preferably 10 μm or more and 100 μm or less.

[0059] The light-absorbing layer 402 may be a printed layer or a colored resin sheet containing a coloring agent. The printed layer may be, for example, a layer printed with an ink containing a coloring agent and a binder resin. The printing method is not particularly limited, and known printing methods such as screen printing and gravure printing can be used. The colored resin sheet may be a resin composition containing a coloring agent formed into a sheet. The resin composition is not particularly limited. A black coloring agent is preferred as the coloring agent, and black pigments such as carbon black are examples. The transmittance of the light-absorbing layer 402 can be adjusted by changing the amount of coloring agent added and the thickness of the printed layer or colored resin sheet.

[0060] If the light-absorbing layer 402 is a printed layer, the thickness of the printed layer is preferably 3 μm or more and 100 μm or less, and more preferably 5 μm or more and 30 μm or less. Although not shown in the figures, if the light-absorbing layer 402 is a colored resin sheet containing a coloring agent, it may also serve as the base material 404. When the light-absorbing layer 402 also serves as the base material 404, the thickness of the light-absorbing layer 402 is preferably 6 μm or more and 200 μm or less, and more preferably 10 μm or more and 100 μm or less.

[0061] The total light transmittance of the light-absorbing layer 402 is preferably 18% or more and 30% or less, and more preferably 20% or more and 30% or less.

[0062] The adhesive member 400 may further have a base material 404, and as in the first example 400A of the adhesive member shown in Figure 4, the light-absorbing layer 402 and the reflective metal layer 403 may be arranged in front of the base material 404. In the first example 400A, the light-absorbing layer 402, the reflective metal layer 403, and the base material 404 may be arranged in that order from the observation surface side, and the light-absorbing layer 402 and the reflective metal layer 403, and the reflective metal layer 403 and the base material 404 may be in contact with each other.

[0063] The base material 404 is a resin sheet, and examples of resin base materials include polyethylene terephthalate (PET), acrylic, polycarbonate, polypropylene, and polystyrene.

[0064] The thickness of the base material 404 is preferably 25 μm or more and 300 μm or less, and more preferably 50 μm or more and 200 μm or less.

[0065] As shown in the second example 400B of the adhesive member in Figure 5, the light-absorbing layer 402 and the reflective metal layer 403 may be arranged on the back side of the base material 404. In the second example 400B, the base material 404, light-absorbing layer 402, and reflective metal layer 403 may be arranged in that order from the observation surface side, and the base material 404 and the light-absorbing layer 402, and the light-absorbing layer 402 and the reflective metal layer 403 may be in contact with each other. The adhesive member of the second example 400B can be obtained, for example, by forming the light-absorbing layer 402 on the base material 404, and then forming the reflective metal layer 403 on the light-absorbing layer 402.

[0066] In the first example 400A, the color and transmittance of the substrate 404 are not particularly limited, but in the second example 400B, the substrate 404 is preferably a transparent resin substrate, for example, with a total light transmittance of 80% or more, and more preferably 90% or more. The substrate 404 preferably has a haze of 10% or less.

[0067] As shown in the third example 400C of the adhesive member in Figure 6, the light-absorbing layer 402 may be positioned in front of the substrate 404, and the reflective metal layer 403 may be positioned behind the substrate 404. In the third example 400C, the light-absorbing layer 402, substrate 404, and reflective metal layer 403 may be arranged in that order from the observation surface side, and the substrate 404 and the light-absorbing layer 402, and the substrate 404 and the reflective metal layer 403 may be in contact with each other. The adhesive member of the third example 400C can be obtained, for example, by forming either the light-absorbing layer 402 or the reflective metal layer 403 on one side of the substrate 404, either the observation surface side or the back side, and forming the other of the light-absorbing layer 402 and the reflective metal layer 403 on the other side of the substrate 404. Either the light-absorbing layer 402 or the reflective metal layer 403 may be formed first.

[0068] From the viewpoint of bringing the reflection of the substrate 404 on the front plate 110 side closer to specular reflection, it is preferable that the surface of the side on which the reflective metal layer 403 is placed is flat, and for example, it is preferable that the arithmetic mean roughness Ra is 1 μm or less. The arithmetic mean roughness Ra can be measured using, for example, a laser microscope VK-X3000 manufactured by Keyence Corporation, in accordance with the method compliant with JIS B 0601:2001.

[0069] The adhesive member 400 preferably has an adhesive layer. Embodiment 1 illustrates a case where the adhesive member 400 is a double-sided tape in which the observation surface side is composed of a first adhesive layer 401a and the back surface is composed of a second adhesive layer 401b. When the front plate 110 and the bezel 310 are bonded together using only the adhesive member 400, the first adhesive layer 401a is in contact with the front plate 110 and the second adhesive layer 401b is in contact with the bezel 310.

[0070] The first adhesive layer 401a can be an acrylic adhesive, a silicone adhesive, or the like. As the first adhesive layer 401a, LUCIACS CS986 manufactured by Nitto Denko Corporation can be used. The first adhesive layer 401a is preferably transparent, and its total light transmittance is preferably 80% or higher. The second adhesive layer 401b can be the same as the first adhesive layer 401a, but the second adhesive layer 401b does not have to be transparent, and its color and transmittance are not particularly limited.

[0071] The thickness of the first adhesive layer 401a and the second adhesive layer 401b is preferably 10 μm or more and 100 μm or less, and more preferably 20 μm or more and 50 μm or less. The thickness of the first adhesive layer 401a and the thickness of the second adhesive layer 401b may be the same or different.

[0072] Figure 7 is a schematic plan view showing an example of the arrangement of the adhesive member 400 in the display device according to Embodiment 1. Figure 8 is a schematic plan view showing another example of the arrangement of the adhesive member 400 in the display device according to Embodiment 1. In Embodiment 1, it is preferable that the adhesive member 400 is arranged so as not to protrude from the bezel 310 in a plan view. For example, as shown in Figure 1, it may be arranged to surround the display panel 100, or as shown in Figure 7, it may be arranged in multiple parts on the bezel 310. Also, as shown in Figures 1 and 7, the adhesive member 400 may be arranged so as to overlap a part of the bezel 310 in a plan view.

[0073] As shown in Figures 1 and 7, if there is a portion of the bezel 310 where the adhesive member 400 is not placed, it is preferable to bring the reflection of the observation surface side of the bezel 310 in the non-bonded portion where the adhesive member 400 is not placed closer to specular reflection. By bringing the reflection of the bezel 310 closer to specular reflection, the SCI and SCE of the non-bonded portion where the adhesive member 400 is not placed can be brought closer to the SCI and SCE of the display area, making the boundary between the non-bonded portion and the display area less noticeable.

[0074] One method for bringing the reflection of the observation surface of the bezel 310 closer to specular reflection is to reduce the arithmetic mean roughness Ra of the observation surface of the bezel 310 to 1 μm or less.

[0075] In the cases of Figures 1 and 7, the width of the adhesive member 400 may be narrower than the width of the bezel 310. In a plan view, the width of the adhesive member 400 is preferably, for example, 300 μm or more and 2.0 cm or less, and more preferably 500 μm or more and 1.0 cm or less. The widths of the first adhesive layer 401a, the light absorbing layer 402, the reflective metal layer 403, the substrate 404, and the second adhesive layer 401b contained in the adhesive member 400 are all the same.

[0076] As shown in Figure 8, the adhesive member 400 may be positioned so as to overlap the entire surface of the bezel 310 in a plan view. In Figure 8, the width of the adhesive member 400 is the same as the width of the bezel 310. By positioning the adhesive member 400 so as to overlap the entire surface of the bezel 310 in a plan view, the boundary between the display area and the frame area can be made less noticeable.

[0077] The thickness of the adhesive member 400 is preferably 50 μm or more and 1 mm or less, more preferably 50 μm or more and 500 μm or less, and more preferably 75 μm or more and 300 μm or less.

[0078] (Backlight) As shown in Figure 2, the backlight 200 may be placed on the back side of the display panel 100. In particular, if the display panel 100 is a liquid crystal panel, it is preferable that the display device 1 is equipped with a backlight 200.

[0079] As the backlight 200, known types can be used, such as edge-lit backlights in which light-emitting elements are arranged on the edge of a light guide plate, and direct-lit backlights in which a large number of light-emitting elements are arranged in a plane and uniformity is improved with a diffuser plate or the like. As the light-emitting elements, known types in the field of backlights can be used, such as light-emitting diodes (LEDs), fluorescent lamps, cold cathode fluorescent lamps, etc.

[0080] <Display method> When the display device 1 is lit, transmitted display is performed in which light (display light) emitted from the display panel side passes through the front panel and is emitted to the observation surface side, allowing an observer to visually recognize any image or the like displayed on the display panel. When the display panel is a liquid crystal panel, the transmitted display can be performed by setting the liquid crystal panel to a white display state and lighting the backlight. By orienting the liquid crystal molecules at an angle with respect to the transmission axis of the polarizing plate, the light emitted from the backlight is transmitted to the observation surface side, resulting in a white display state. The transmittance is maximized when the orientation direction of the liquid crystal molecules forms an angle of 45° with the transmission axis of the polarizing plate. By orienting the liquid crystal molecules substantially parallel to the transmission axis of the polarizing plate, the light transmitted to the observation surface side is blocked by the liquid crystal layer even when the backlight is lit, resulting in a black display state.

[0081] The bezel 310 preferably has the same appearance as the display panel 100 when it is not lit. Specifically, in a plan view, the region overlapping the display panel 100 is defined as the display region 1AA, the region overlapping the bezel 310 is defined as the frame region 1NA, and the x value in the xy chromaticity diagram of the display region 1AA measured from the observation surface side when the display device 1 is not lit is x α-1 , , β-1 , , <00~00010>,

[0082] , β-1 and the y value is y α-1 Let the x value in the xy chromaticity diagram of the frame region 1NA measured from the observation surface side be x β-1 and the y value be y β-1 Then, the absolute value of the difference between the above x α-1 and the above x β-1 and the absolute value of the difference between the above y α-1 and the above y β-1 are both preferably 0.02 or less. In the display device 1 in such a mode, the boundary between the bezel ۳۱۰ and the display panel 100 can be made more difficult to visually recognize, thus realizing a better appearance.

[0082] The above x α-1 value is preferably 0.293 or more and 0.333 or less, and the y α-1 value is preferably 0.309 or more and 0.349 or less. The above x β-1 value is preferably 0.293 or more and 0.333 or less, and the above y β-1The value is preferably between 0.309 and 0.349. A display device 1 in this configuration can suppress an overly ornate appearance and achieve a calm and understated appearance.

[0083] Figure 9 is a schematic plan view showing a modified example of Embodiment 1, illustrating the case where an image is displayed on a display device capable of local dimming. Note that in Figure 9, the visual difference between the display panel 100 and the bezel 310 is omitted.

[0084] Local dimming, also known as partial dimming, is a display method that divides the display area 1AA into multiple areas (dimming areas) and adjusts the brightness (luminescence intensity) for each area. An example of a display device 1 capable of local dimming is a display panel 100 that is further equipped with a backlight 200 that is capable of local dimming, located on the back side of the display panel 100.

[0085] The backlight 200 is preferably a direct-lit backlight. Alternatively, an OLED panel may be used as the light-emitting element for the backlight 200. The display device 1 further includes a brightness adjustment mechanism for adjusting the brightness of the backlight 200. The brightness adjustment mechanism preferably adjusts the light emission intensity of multiple light-emitting elements for each divided region according to the display image of the liquid crystal panel. When an organic EL display is used as the display panel, unlit pixels are displayed in black, resulting in an appearance similar to that obtained when a backlight positioned on the back of the liquid crystal display is locally dimmed.

[0086] By implementing local dimming, a highly designed display device 1 can be realized, as shown in Figure 14, in which an image (the string "ABCDE" in Figure 9) appears to float on a black background. Local dimming changes the brightness (luminance) of the backlight according to the brightness of each dimming area of ​​the display panel. In dimming areas where bright images are displayed, the luminance of the backlight is increased, and in dimming areas where dark images are displayed, the luminance of the backlight is decreased. In dimming areas that display only black, the luminance of the backlight is further reduced or the backlight is turned off. The portion of display area 1AA that is set to black can achieve the same level of black as when the backlight 200 is off, resulting in a good appearance.

[0087] <Embodiment 2> In Embodiment 2, the adhesive member 400 has a light-shielding layer 405. The light-shielding layer 405 can be any light-shielding layer, but a specific example of the light-shielding layer 405 is, for example, a printed layer with black ink. The printing method is not particularly limited, and known printing methods such as screen printing and gravure printing can be used. The total light transmittance of the light-shielding layer 405 is, for example, 2% or less.

[0088] It is preferable that the light-shielding layer 405 be positioned on the back side of the reflective metal layer 403. Pinholes may occur in the reflective metal layer 403 due to moisture during thin film formation, and the bezel 310 may be visible through these pinholes. By positioning the light-shielding layer 405 on the back side of the reflective metal layer 403, it is possible to prevent the bezel 310 from being visible through pinholes even if they occur in the reflective metal layer 403. It is preferable that the light-shielding layer 405 and the reflective metal layer 403 are in contact. Furthermore, considering that the light-absorbing layer 402 is semi-transparent, it is even more preferable that the light-shielding layer 405 be positioned on the back side of the light-absorbing layer 402.

[0089] The adhesive members that can be used in Embodiment 2 are described below. Specifically, adhesive members 400D to 400F are described below, but unless otherwise specified, they will be referred to as adhesive member 400. Figure 10 is a schematic cross-sectional view showing the fourth example 400D of the adhesive member that can be used in Embodiment 2. Figure 11 is a schematic cross-sectional view showing the fifth example 400E of the adhesive member that can be used in Embodiment 2. Figure 12 is a schematic cross-sectional view showing the sixth example 400F of the adhesive member that can be used in Embodiment 2.

[0090] In Embodiment 2, the adhesive member 400 may also have a base material 404, and as in the fourth example 400D of the adhesive member shown in Figure 10, the light-absorbing layer 402, the reflective metal layer 403, and the light-shielding layer 405 may be arranged in front of the base material 404. In the fourth example 400D, the light-absorbing layer 402, the reflective metal layer 403, the light-shielding layer 405, and the base material 404 may be arranged in that order from the observation surface side, and the light-absorbing layer 402 and the reflective metal layer 403, the reflective metal layer 403 and the light-shielding layer 405, and the light-shielding layer 405 and the base material 404 may be in contact with each other.

[0091] As shown in the fifth example 400E of the adhesive member in Figure 11, the light-absorbing layer 402 and the reflective metal layer 403 may be arranged on the back side of the base material 404. In the fifth example 400E, the base material 404, light-absorbing layer 402, reflective metal layer 403, and light-shielding layer 405 may be arranged in that order from the observation surface side, and the base material 404 and the light-absorbing layer 402, the light-absorbing layer 402 and the reflective metal layer 403, and the reflective metal layer 403 and the light-shielding layer 405 may be in contact with each other.

[0092] As shown in the sixth example 400F of the adhesive member in Figure 12, the light-absorbing layer 402 may be positioned in front of the base material 404, and the reflective metal layer 403 and light-shielding layer 405 may be positioned behind the base material 404. In the sixth example 400F, the light-absorbing layer 402, base material 404, reflective metal layer 403, and light-shielding layer 405 may be arranged in that order from the observation surface side, and the light-absorbing layer 402 and base material 404, the base material 404 and reflective metal layer 403, and the reflective metal layer 403 and light-shielding layer 405 may be in contact with each other.

[0093] In Embodiment 2, it is preferable that the adhesive member 400 has the observation surface side composed of the first adhesive layer 401a described above.

[0094] If the width of the adhesive member 400 is narrower than the width of the bezel, the adhesive member 400 may be positioned so as to overlap a portion of the bezel 310 in a plan view, as shown in Figures 1 and 7 described in Embodiment 1. If the width of the adhesive member 400 is the same as the width of the bezel, the adhesive member 400 may be positioned so as to overlap the entire surface of the bezel 310 in a plan view, as shown in Figure 8 described in Embodiment 1. If the width of the adhesive member 400 is narrower than or the same as the width of the bezel, although not shown, the back surface of the adhesive member 400 may be composed of a second adhesive layer 401b, similar to Embodiment 1. The first adhesive layer 401a and the second adhesive layer 401b can be the same as those described in Embodiment 1.

[0095] Figure 13 is a schematic plan view of the display device according to Embodiment 2. Figure 14 is a schematic cross-sectional view showing an enlarged view of the area around the adhesive portion between the bezel 310 and the front panel 110 of the display device according to Embodiment 2. A portion of the adhesive member 400 may overlap with a portion of the display panel 100 in a plan view. By arranging the adhesive member 400 so as to overlap with a portion of the display panel, in other words, by arranging the adhesive member 400 so as to protrude from the bezel 310 towards the display panel 100, the adhesive member 400 can also be placed in the gap between the bezel 310 and the display panel 100. This configuration can block backlight light leaking from the gap, thereby improving the appearance of the display device.

[0096] In the cases of Figures 13 and 14, the width of the adhesive member 400 is preferably wider than the width of the bezel 310, for example, 0.3 cm or more and 1 cm or less in a plan view. Also, in a plan view, the distance W1 from the end of the bezel 310 on the display panel 100 side to the end of the adhesive member 400 on the display panel 100 side (the width of the adhesive member 400 that protrudes towards the display panel 100 side) is preferably 2 mm or more and 5 mm or less.

[0097] In the cases of Figures 13 and 14, the adhesive member 400 is preferably a single-sided tape that does not have the second adhesive layer 401b described above on its back side, and the adhesive member 400 and the bezel 310 may be bonded together via another fixing tape 410. The fixing tape 410 is not particularly limited and can be a known adhesive layer, a double-sided tape, etc. For example, the same type as the double-sided tape 301TR exemplified in comparative form 2 described later can be used.

[0098] <Embodiment 3> The display device of Embodiment 3 has a front panel 110 with a design layer 120. Figure 15 is a schematic cross-sectional view of the display device of Embodiment 3. Figure 16 is a schematic plan view of the display device of Embodiment 3. Figures 15 and 16 illustrate the case where the design layer 120 has a marble pattern.

[0099] In the third embodiment of the display device 1, in transmissive display mode, light emitted from the observation surface side of the display panel 100 passes through the front panel 110 and the design layer 120 and is emitted to the observation surface side. In addition to transmissive display, the third embodiment of the display device can also allow the observer to see the color and pattern of the design layer 120 by reflecting light (external light) incident on the display device from the observation surface side.

[0100] Because the front panel 110 has a design layer 120, when not illuminated, the display device 1 appears only as a marble-patterned decorative panel, and it is not apparent that there is a display panel 100 on the back side of the front panel 110. On the other hand, when illuminated, the display device 1 appears as if an image (in Figure 16, the string of letters ABCDE) is floating on the decorative panel, as shown in Figure 16, resulting in a highly aesthetic design. Furthermore, by partially reducing the brightness of the display device 1 to the extent that the pattern of the design layer is visible to the observer due to reflected light, it is possible to make the color of the front panel 110, or the color and pattern of the design layer 120, appear to overlap with the image of the display panel. Note that even when a design layer is not provided, as in Embodiment 1, the color of the front panel 110 can be made visible to the observer by coloring the front panel 110.

[0101] The design layer 120 is a layer that expresses a specific pattern, etc., and the pattern, etc. is visible to the observer due to the reflection of external light. The specific pattern is not particularly limited, but examples include a stylistic geometric pattern, carbon fiber pattern, marble pattern, wood grain pattern, marble pattern, specific string of characters, a company logo, etc.

[0102] From the viewpoint of making the boundary between the display area 1AA and the frame area 1NA difficult to see, it is preferable that the design layer 120 be arranged so as to overlap the display area 1AA and the frame area 1NA of the display panel 100 in a plan view. The design layer 120 may be arranged on the entire surface of the front panel 110 or on only a part of it in a plan view. The design layer 120 is, for example, a semi-transparent picture or pattern. The above-mentioned specific pattern is arranged on the front panel 110 as the design layer 120 by semi-transparent printing or the like. For reference, if the above-mentioned pattern is a wood grain pattern, the transmittance of the design layer 120 is about 60-80%.

[0103] As the design layer 120, the configuration described in Japanese Patent No. 4184711 (Patent Document 2), etc., can be used. For example, the design layer 120 can be printed using an ink containing a luminous pigment.

[0104] The design layer 120 may be printed on the surface of the transparent substrate 111, for example, by a printing method such as gravure printing, screen printing, or inkjet printing. Figure 15 illustrates the case where the design layer 120 is placed on the front side of the transparent substrate 111, but the design layer 120 may also be placed on the back side of the transparent substrate 111.

[0105] The following describes the conventional display devices according to comparative embodiments 1 to 4 with reference to the drawings. In comparative embodiments 1 to 4, the adhesive member 400 shown in the above embodiment is not used. Note that the display panel 100R, front panel 110R, backlight 200R, and bezel 310R in comparative embodiments 1 to 4 can be the same as those described in the display panel 100, front panel 110, backlight 200, and bezel 310 in embodiment 1, so redundant explanations will be omitted.

[0106] <Comparison Form 1> The display device 1R according to Comparative Embodiment 1 is an example of a conventional display device, and is a display device in which a display panel 100R and a front plate 110R are fully bonded together with an optical transparent adhesive 301AR. Figure 17 is a schematic plan view of the conventional display device according to Comparative Embodiment 1. Figure 18 is a schematic cross-sectional view of the conventional display device according to Comparative Embodiment 1. Figure 19 is an enlarged schematic cross-sectional view illustrating the external light reflection in the area enclosed by the dotted line in Figure 18.

[0107] The display device 1R according to comparative form 1 houses a display panel 100R with a backlight 200R on the rear side in a housing 300R having a bezel 310R and a bottom 320R. A frame printing section 110PR is provided in the frame area 1NA of the front panel 110R using black ink or the like. The display panel 100R and the front panel 110R are bonded together with an optical transparent adhesive sheet (hereinafter also referred to as an OCA sheet) 301AR. Therefore, there is no air layer between the display panel 100R and the front panel 110R, and no interfacial reflection occurs between the front panel 110R and the air layer. Examples of OCA sheets 301AR include LUCIACS(registered trademark) CS986 manufactured by Nitto Denko Corporation.

[0108] In the display device 1R of comparative form 1, the frame area 1NA can be made less noticeable by bringing the reflective characteristics of the frame printing section 110PR closer to the reflective characteristics of the surface of the display area 1AA when it is not displayed. In Figure 17, the surface reflectance of the frame printing section 110PR is shown by A, and the surface reflectance of the display panel 100R is shown by B. By adjusting the reflectance of the frame printing section 110PR so that the surface reflectance A of the frame printing section 110PR = the surface reflectance B of the display panel 100R, the appearance can be improved. Since the display device 1R of comparative form 1 can lower the reflectance of the display area 1AA than the display device relating to comparative form 2 (see Figure 20) described later, the display area 1AA can be made darker as shown in Figure 17, making it more difficult to see the boundary between the frame printing section 110PR and the display panel 100.

[0109] On the other hand, in addition to the high cost of the OCA sheet 301AR itself, the process of bonding the front panel 110R and the display panel 100R with the OCA sheet 301AR is usually performed under vacuum, requiring expensive vacuum bonding equipment and taking a considerable amount of time, thus increasing the manufacturing cost of the display device. Furthermore, there is a risk of air bubbles or dust getting trapped during the bonding process with the OCA sheet 301AR. Moreover, there is a risk that the display panel 100R to which the front panel 110R has been bonded may warp due to temperature changes. These concerns are particularly likely to occur in large display devices (e.g., 32 inches or larger).

[0110] In this embodiment, the display device is constructed such that the front panel 110 and the display panel 100R are not fully bonded together with an OCA sheet 301AR. This eliminates the risk of air bubbles entering or the display panel warping due to temperature changes, thus reducing manufacturing costs.

[0111] <Comparison Form 2> Figure 20 is a schematic plan view of a conventional display device according to comparative form 2. Figure 21 is a schematic cross-sectional view of a conventional display device according to comparative form 2. Figure 22 is an enlarged schematic cross-sectional view illustrating the ambient light reflection in the area enclosed by the dotted line in Figure 21.

[0112] As shown in Figures 21 and 22, the display device 1R according to comparative embodiment 2 has a frame printing section 110PR on the front panel 110R, and the front panel 110R and the display panel 100R are bonded together by double-sided tape 301TR provided in the frame area 1NA. The double-sided tape 301TR is a general-purpose double-sided tape and, unlike the adhesive member 400 of embodiment 1, is an adhesive member that does not include a light-absorbing layer 402, a reflective metal layer 403, etc. In the display device 1R of comparative embodiment 2, the double-sided tape 301TR is located on the back side of the frame printing section 110PR, so the bonded area where the double-sided tape 301TR is placed is not visible from the observation surface side. Examples of the above double-sided tape include the LCD component fixing double-sided tape #3800 series manufactured by Sekisui Chemical Co., Ltd.

[0113] In comparative form 2, the display device 1R has an air layer 400a between the front panel 110R and the display panel 100R, so interfacial reflection occurs between the front panel 110R and the air layer 400a. In comparative form 2, even if the reflective characteristics of the frame printing section 110PR are made to be closer to the reflective characteristics of the surface of the display area 1AA when it is not displayed, the air layer 400a is located in a position that overlaps with the display area 1AA, so the frame printing section 110PR is more conspicuous than in comparative form 1.

[0114] In Figure 22, the surface reflectance of the frame printing section 110PR is shown by A, the surface reflectance of the display panel 100R is shown by B, and the interface reflectance between the front panel 110R and the air layer 400a is shown by C. In principle, if the surface reflectance of the frame printing section 110PR can be adjusted so that the surface reflectance A = (surface reflectance B of the display panel 100R) + (interface reflectance C between the front panel 110R and the air layer 400a), it should be possible to make the boundary between the frame printing section 110PR and the display area 1AA difficult to see. However, the surface reflection of the frame printing section 110PR is, for example, light scattering reflection due to the ink printed on the surface of the frame printing section 110PR, while the interface reflection between the front plate 110R and the air layer 400a is specular reflection. Therefore, including the angular characteristics, it is extremely difficult to bring the surface reflectance A closer to the surface reflectance B + interface reflectance C, and the frame region 1NA where the frame printing section 110PR is located becomes conspicuous.

[0115] <Comparison Form 3> Figure 23 is a schematic plan view of a conventional display device relating to comparative form 3. Figure 24 is a schematic cross-sectional view of a conventional display device relating to comparative form 3. Figure 25 is an enlarged schematic cross-sectional view illustrating the ambient light reflection in the area enclosed by the dotted line in Figure 24.

[0116] As shown in Figures 24 and 25, the display device 1R according to comparative form 3 does not have a frame printing section 110PR on the front panel 110R, and the front panel 110R and the bezel 310R are bonded together with an adhesive member 301TR. As the adhesive member 301TR, the OCA sheet 301AR exemplified in comparative form 1, the double-sided tape 301TR exemplified in comparative form 2, etc., can be used. The display device 1R of comparative form 3 has an air layer 400a between the front panel 110R and the display panel 100R, so interfacial reflection occurs between the front panel 110R and the air layer 400a.

[0117] In the display device 1R of comparison form 3, if the color of the bezel 310R in the non-bonded area where double-sided tape 301TR etc. is not placed is the same as the color of the display area 1AA when it is not lit, the difference in appearance between the display area 1AA and the bezel 310R will be less noticeable than in comparison form 1. This is because both the non-bonded area of ​​the display area 1AA and the frame area 1NA have an air layer on the back side of the front panel 110R, causing interfacial reflection between the front panel 110R and the air layer. However, in the display device 1R of comparison form 3, the surface of the display panel 100R and the surface of the bezel 310R are also visible to the observer, so it is difficult to make the display area 1AA and the frame area 1NA look the same.

[0118] When an opaque material is used as the adhesive material 301TR, reflection occurs at the surface of the opaque material at the bonding area. On the other hand, when a transparent material is used as the adhesive material 301TR, reflection occurs at the surface of the frame (bezel 310R) at the bonding area, but in either case, no interfacial reflection with the air layer occurs. Thus, differences in reflection characteristics occur between the bonded and unbonded areas, resulting in differences in appearance.

[0119] In Figure 25, the surface reflectance of the double-sided tape 301TR is shown by A, the surface reflectance of the display panel 100R is shown by B, and the interface reflectance between the front plate 110R and the air layer 400a is shown by C. In principle, by adjusting the reflectance of the double-sided tape 301TR (substrate and adhesive layer) so that the surface reflectance A of the double-sided tape 301TR = (surface reflectance B of the display panel 100R) + (interface reflectance C between the front plate 110R and the air layer 400a), it should be possible to make the boundary between the display area 1AA and the bonded area where the double-sided tape 301TR is placed less visible. However, since the surface of the double-sided tape 301TR is normally light scattering reflect, and the interface reflection between the front plate 110R and the air layer 400a is specular reflect, it is extremely difficult to bring the surface reflectance A closer to the surface reflectance B + interface reflectance C, including the angular characteristics, and the bonded area becomes noticeable.

[0120] Furthermore, if the double-sided tape 301TR is transparent, the surface reflection of the double-sided tape 301TR will be eliminated, and the reflection will occur on the surface of the bezel 310R. Therefore, the surface reflectance A is replaced with the surface reflectance of the bezel 310R, and the reflectance of the bezel 310R is adjusted so that surface reflectance A = surface reflectance B + interface reflectance C. Also, if the double-sided tape 301TR is opaque (for example, if a black base material is used as the double-sided tape 301TR), the double-sided tape 301TR will become less noticeable to some extent because the color of the double-sided tape 301TR and its surroundings are similar.

[0121] <Comparison Form 4> Figure 26 is a schematic plan view illustrating a conventional display device in which the front panel includes a design layer. When the front panel 110R of a conventional display device 1R includes a design layer, the appearance of the pattern changes depending on the location on the display device 1R when the lights are off, resulting in poor design. Specifically, as shown in Figure 26, the appearance of the bonded area where the double-sided tape 301TR is placed on the bezel differs from the appearance of the non-bonded area where the double-sided tape 301TR is not placed, and the appearance of the display area.

[0122] Compared to comparative embodiments 2 to 4, the display device according to the embodiment makes the appearance of the display area 1AA and the bonded portion similar by setting both |α1-β1| and |α2-β2| to 3.0% or less.

[0123] Although embodiments of the present disclosure have been described above, the present disclosure is not limited to the embodiments described above and can be implemented in various forms without departing from its essence. Furthermore, the multiple components disclosed in the above embodiments can be modified as appropriate. For example, some components from all the components shown in one embodiment may be added to the components of another embodiment, or some components from all the components shown in one embodiment may be deleted from that embodiment. Each embodiment can also be combined.

[0124] Furthermore, the drawings schematically show each component in order to facilitate understanding of the invention, and the thickness, length, number, spacing, etc. of each component shown may differ from the actual dimensions due to the convenience of drawing creation. Also, the configuration of each component shown in the above embodiments is merely an example and is not particularly limiting, and it goes without saying that various modifications are possible within the scope that does not substantially deviate from the effects of this disclosure. [Examples]

[0125] The present invention will be described in more detail below with reference to experimental examples, but the present invention is not limited to these experimental examples.

[0126] (Experimental Example 1) In Experimental Example 1, as shown in Figure 4, an adhesive member 400 was fabricated in which the first adhesive layer 401a, light-absorbing layer 402, reflective metal layer 403, substrate 404, and second adhesive layer 401b were arranged in that order from the observation surface side.

[0127] A transparent PET film with a thickness of 50 μm (Lumirror manufactured by Toray Industries, Inc., total light transmittance 92%, haze 0.91%) was used as the substrate 404. A thin aluminum film with a thickness of 150 nm was formed on one side of the substrate 404 as a reflective metal layer 403 by sputtering. The SCI of the reflective metal layer 403 was 85.1%, and the SCE was 2.3%.

[0128] Light-absorbing layers 402 with a thickness of 5 μm were fabricated by varying the amount of black pigment (carbon black) added to the resin (Hydric, manufactured by Dainichi Seika Co., Ltd.) to achieve the total light transmittances shown in Table 2 for conditions 1 to 6 below, and each layer was laminated onto a reflective metal layer 403. Subsequently, a first adhesive layer 401a with a thickness of 50 μm was laminated on the side of the light-absorbing layer 402, and a second adhesive layer 401b with a thickness of 50 μm was laminated on the side of the substrate 404 opposite to the side where the reflective metal layer 403 was formed, thereby fabricating the adhesive member of Experimental Example 1. LUCIACS CS986, manufactured by Nitto Denko Corporation, was used for both the first adhesive layer 401a and the second adhesive layer 401b.

[0129] (Experimental Example 2) Figure 27 is a schematic cross-sectional view of the adhesive member 400R fabricated in Experimental Example 2. In Experimental Example 2, as shown in Figure 27, an adhesive member 400 was fabricated in which the first adhesive layer 401a, light absorption layer 402, substrate 404, and second adhesive layer 401b were arranged in that order from the observation surface side. In Experimental Example 2, the reflective metal layer 403 was not used, and a 20 μm thick white PET film (Lumirror manufactured by Toray Industries, Inc., total light transmittance 20%, haze 70%) was used as the substrate 404. The SCI of the white PET film was 73.4%, and the SCE was 68.9%.

[0130] The light-absorbing layers 402 under conditions 1-6 were laminated on one side of a white PET film, similar to Experimental Example 1, and then the first adhesive layer 401a and the second adhesive layer 401b were laminated to create the adhesive member of Experimental Example 2.

[0131] (Fabrication of display devices) Figure 28 is a schematic cross-sectional view of the display devices using adhesive members in Experimental Examples 1 and 2. In Experimental Example 1, a liquid crystal panel was used as the display panel 100, and a direct-type backlight 200 equipped with a diffuser plate 202 and an LED 201 as a light source was used (see Figure 28). The adhesive members of Experimental Examples 1 and 2, each having a light absorption layer under conditions 1 to 6, were placed on the bezel so as to surround the display panel 100, and the bezel and the front plate (a glass plate with a thickness of 1.5 mm) were bonded together using each adhesive member to fabricate the display device (see Figure 1).

[0132] The SCI and SCE of light L1 reflected from the display area of ​​the display device were measured, and the results are shown in Table 1. SCI and SCE were measured using a Konica Minolta CM-700d in accordance with the method (JIS Z 8722:2009). As shown in Table 1, the SCE of the display area is almost zero, indicating that it is almost specular reflection.

[0133] [Table 1]

[0134] The SCI and SCE of light L2 reflected at the bonding area where each adhesive material is placed on the bezel were measured. The results for Experimental Example 1 are shown in Table 2 below, and the results for Experimental Example 2 are shown in Table 3 below. In addition, the absolute value of the difference between α1 and β1 (|α1-β1|), the absolute value of the difference between α2 and β2 (|α2-β2|), and the reflectance of β2 relative to β1 (β2 / β1) × 100 [%] are shown in Tables 2 and 3 below.

[0135] In the table below, α1 is defined as the reflectance measured from the front panel side using the SCI method in the area overlapping with the display panel (display area) in a plan view. β1 is defined as the reflectance measured from the front panel side using the SCI method in the area overlapping with the bezel (bonded area) in a plan view. α2 is defined as the reflectance measured from the front panel side using the SCE method in the area overlapping with the display panel (display area) in a plan view. β2 is defined as the reflectance measured from the front panel side using the SCE method in the area overlapping with the bezel (bonded area) in a plan view.

[0136] [Table 2]

[0137] The larger the values ​​of |α1-β1| and / or |α2-β2|, the more noticeable the boundary between the display area and the bonded area tended to be. In Experimental Example 1, condition 4 resulted in the SCI and SCE of the bonded area being close to those of the display area shown in Table 1, and the boundary between the display area and the bonded area was almost invisible to the naked eye, resulting in the best appearance. From these results, it is considered that |α1-β1| and |α2-β2| should preferably be 3.0% or less, and more preferably 1.5% or less. Specifically, when the reflectance of the display area is as shown in Table 1 for SCI and SCE, the SCI of the bonded area should preferably be 10.1% or more and 16.1% or less, and the SCE of the bonded area should preferably be 0% to 3.1% or less. In this case, the SCI of the bonded area should preferably be 11.6% or more and 14.6% or less, and the SCE of the bonded area should preferably be 0% or more and 1.6% or less.

[0138] [Table 3]

[0139] In Experiment Example 2, the boundary between the display area and the bonded area was noticeable in all conditions 1 to 6. The white PET sheet used as the substrate in Experiment Example 2 exhibited diffuse reflection and had a large SCE, so although condition 5 was close to the SCI of the display area, the SCE values ​​differed significantly, suggesting that there was no condition in which the two reflection characteristics approximated. In this case, the boundary was difficult to see when observed from the specular reflection direction (normal direction), but it was noticeable when viewed from an oblique direction. [Explanation of Symbols]

[0140] 1, 1R: Display device 1AA:Display area 1NA: Frame area 100, 100R: Display panel 110, 110R: Front plate 110PR: Picture Frame Printing Department 111: Transparent base material 120: Design layer 130: Bezel 200, 200R: Backlight 201: LED 202: Widespread Version 300: Cabinet 300R: Cabinet 301AR: Optical transparent adhesive (OCA sheet) 301TR: Adhesive material (double-sided tape) 310, 310R: Bezel 320, 320R: Bottom 400, 400A, 400B, 400C, 400R: Adhesive material 400a: Air layer 401a: First adhesive layer 401b: Second adhesive layer 402: Light-absorbing layer 403: Reflective metal layer 404: Base material 405: Light blocking layer 410: Fixing tape

Claims

1. Display panel and, A housing that houses the display panel and has a bezel positioned around the display panel in a plan view, A front panel is positioned on the observation side of the display panel and overlaps with at least a portion of the display panel and the bezel in a plan view, The system includes an adhesive member disposed between the bezel and the front panel, There is an air layer between the display panel and the front panel, If, in a plan view, the reflectance measured from the front panel side using the SCI method in the area overlapping with the display panel is α1, the reflectance measured from the front panel side using the SCI method in the area overlapping with the bezel is β1, the reflectance measured from the front panel side using the SCE method in the area overlapping with the display panel is α2, and the reflectance measured from the front panel side using the SCE method in the area overlapping with the bezel is β2, The absolute value of the difference between α1 and β1 is 3.0% or less, and A display device in which the absolute value of the difference between α2 and β2 is 3.0% or less.

2. The absolute value of the difference between α1 and β1 is 1.5% or less, and The display device according to claim 1, wherein the absolute value of the difference between α2 and β2 is 1.5% or less.

3. The display device according to claim 1, wherein the adhesive member has a light-absorbing layer and a reflective metal layer.

4. The display device according to claim 3, wherein the adhesive member comprises, from the observation surface side, the light-absorbing layer and the reflective metal layer in that order.

5. The display device according to claim 3 or 4, wherein the surface of the adhesive member on the observation surface side is composed of a first adhesive layer.

6. The display device according to claim 5, wherein the back surface of the adhesive member is composed of a second adhesive layer.

7. The display device according to claim 1, wherein the reflectance of β2 relative to β1 is less than 5%.

8. The display device according to claim 1, wherein the adhesive member is arranged to overlap with a part of the bezel in a plan view.

9. The display device according to claim 1, wherein the adhesive member is arranged to overlap the entire surface of the bezel in a plan view.

10. The display device according to claim 1, wherein a portion of the adhesive member overlaps with a portion of the display panel in a plan view.

11. The display device according to claim 10, wherein the adhesive member has a light-shielding layer.

12. The display device according to claim 1, wherein the front panel has a design layer.

13. The display device according to claim 1, wherein the front panel has a total light transmittance of 5% or more.

14. The display device according to claim 1, which is capable of local dimming drive.

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