JP5849776B2 - Display panel with front plate - Google Patents

Description

  The present invention relates to a display panel with a front plate used for a display device.

  Conventionally, in a flat panel display (FPD) device such as a plasma display (PDP) or a liquid crystal display (LCD), a glass front plate called a “front filter” is installed on the front surface of the display panel. This front plate is mainly installed for the purpose of preventing reflection of ambient light, improving the strength of the FPD device, and preventing impact damage of the FPD device.

  Further, in such a front plate, a frame-like shape is formed on a part or the entire periphery of the peripheral region so as to cover and hide the non-light-emitting portion where the wiring circuit and the like existing in the peripheral portion of the display panel are arranged. The light shielding layer is formed by screen printing or the like (see, for example, Patent Document 1). Here, recent front plates are required to have design and decorativeness for such a frame-shaped light shielding layer, and the demand for a design having a sense of unity is also increasing.

  As one of the designs with such a sense of unity, the front surface of the FPD device appears to emit light as a whole when viewed from the viewing side when the FPD device is turned on, that is, it emits light to the end without any problem. The development of visible technology is desired.

JP 2005-242265 A

  In the present invention, the wiring circuit and the like arranged in the peripheral part of the FPD when the lamp is turned off looks not integrated from the front but is integrated, and the entire front of the FPD emits light when the lamp is turned on. An object of the present invention is to provide a display panel with a front plate that makes it feel like a light emitter.

The display panel with a front plate of the present invention has a display panel in which a central portion is a light emitting region on a main surface on the viewing side, and a frame-like portion outside the light emitting region is a non-light emitting region, and a viewing side of the display panel. A transparent front plate disposed at a predetermined distance so that a main surface having a larger area and a similar shape than the main surface of the display panel faces the main surface of the display panel; and a viewing side of the display panel On the main surface, it is arranged in a frame shape so that light emitted from the display panel is incident light from the vicinity of the position corresponding to the outer periphery of the light emitting region to the inside, and the light is emitted toward the transparent front plate. And the emitted light is substantially on the inner side of the main surface of the transparent front plate from a position corresponding to the inner periphery of the first prism sheet. A first prism sheet designed not to be scattered and to diffuse at least to the outer periphery of the transparent front plate; and a position of the outer periphery of the transparent front plate on a main surface of the transparent front plate facing the display panel A frame-like shape in which the vicinity is the outer periphery, the position near the inner periphery of the first prism sheet is the inner periphery, and the first prism sheet is disposed with a separation distance of 1.65 to 9.9 mm. A second prism sheet or a diffusion plate.

  In this specification, the viewing side refers to the side on which a person viewing the display is present. The opposite side is called the non-viewing side. Hereinafter, the two main surfaces in the display panel are referred to as a viewing-side main surface and a non-viewing-side main surface. The same applies to the two main surfaces of the transparent front plate.

  According to the present invention, the wiring circuit or the like arranged in the peripheral part of the FPD when it is turned off appears to be integrated without being viewed from the front, and the front surface of the FPD is shown to emit light entirely when turned on. It is possible to provide a display panel with a front plate that feels as an integrated light emitter.

It is the top view and sectional drawing which show an example of embodiment of the display panel with a front plate of this invention. FIG. 2 is a plan view of the front panel of the display panel with a front panel shown in FIG. 1 as viewed from the display panel side, and a diagram illustrating an arrangement example of prism sheets on the front panel. It is the top view which looked at the front board in another example of embodiment of the display panel with a front board of the present invention from the display panel side, and a sectional view of a long side direction. It is an expanded sectional view of the prism sheet used for the Example.

  Embodiments according to the display panel with a front plate of the present invention will be described below with reference to the drawings. In addition, this invention is not limited to the following embodiment.

  FIG. 1 is a plan view and a cross-sectional view showing an example of an embodiment of a display panel with a front plate of the present invention. Fig.1 (a) is the top view which looked at the display panel with a front plate of an example of embodiment from the visual recognition side, FIG.1 (b) is the short side of the display panel with a front plate shown to Fig.1 (a). It is sectional drawing at the time of lighting of a direction, and a black arrow shows the advancing direction of light.

  A display panel 10 with a front panel according to an embodiment of the present invention shown in FIG. 1 is a display panel 1 in which a central portion is a light emitting region on the viewing side main surface 1a, and a frame-like portion outside the light emitting region is a non-light emitting region. And a predetermined distance on the viewing side of the display panel 1 such that the non-viewing side main surface 2b having a larger area and a similar shape than the viewing side main surface 1a of the display panel 1 faces the viewing side main surface 1a of the display panel 1 It has a transparent front plate 2 arranged with t. In FIG. 1B, w1 indicates the length (width) of the light emitting region in the short side direction, and w2 indicates the width of the non-light emitting region.

  The display panel 1 emits light toward the transparent front plate 2 with the light emitted from the display panel 1 as incident light on the viewing-side main surface 1a from the position corresponding to the outer periphery of the light emitting region toward the inside. The first prism sheet 3 is provided in a frame shape (in FIG. 1B, the width is indicated by w3). The emitted light from the first prism sheet 3 does not substantially diffuse inside the position corresponding to the inner periphery of the first prism sheet 3 on the non-viewing-side main surface 2b of the transparent front plate 2 and is at least transparent. It is designed to diffuse to the outer periphery of the front plate 2.

  Further, on the non-viewing-side main surface 2b of the transparent front plate 2, a frame shape having an outer periphery near the position of the outer periphery of the transparent front plate 2 and an inner periphery near the position facing the inner periphery of the first prism sheet. A second prism sheet 4 is provided.

  In a conventional display device, a light emitting region (a region corresponding to a region whose width is indicated by w1 in FIG. 1) located at the center of the display panel is a so-called image region that is visually recognized as an image. Even if it is a design that does not usually have a front plate such as an LCD, or a design that usually has a front plate having a function of shielding electromagnetic waves such as a PDP, the light emission of the display panel is the same. An almost entire area is an image area. In this case, the frame-like non-light emitting region (the region corresponding to the region indicated by the width w2 in FIG. 1) existing outside the light emitting region is a dark color concealment frame formed by printing or the like that is covered in a frame shape by the housing. It is designed to be concealed from the viewing side by, for example, disposing a front plate.

  In the display panel 10 with the front panel according to the embodiment of the present invention, the light emission in the area obtained by subtracting the area occupied by the first prism sheet 3 from the light emitting area of the display panel 1 is visually recognized on the viewer side through the transparent front panel 2. The image area S is to be displayed. In FIG. 1A, the image area S is an area indicated by a short side length (width) w4 and a long side length L1. An area F indicated by a width w5 outside the image area S of the transparent front plate 2 is separated from the display panel 1 by the action of the first prism sheet 3 disposed on the viewing-side main surface 1a of the display panel 1. This is a region where the emitted light is diffused and reaches the transparent front plate and transmits to the viewer side.

As a result, the region F becomes a low light emitting region that emits light as a whole although the amount of light is lower than that of the image region S. When the light is turned on, the display panel 10 with the front panel can be seen to emit light as a whole from the viewing side. It can be felt as a light emitter. Hereinafter, the area F outside the image area S of the transparent front plate 2 is referred to as a low light emission area F as necessary. In addition, the low light emission area | region F is also an area | region where an image is not reflected clearly.
The display panel 10 with a front plate according to the embodiment of the present invention has a second panel disposed in a region substantially corresponding to the low light emission region F on the non-viewing-side main surface 2b of the transparent front plate 2 even when the light is turned off. Due to the action of the prism sheet 4, the non-light emitting area of the display panel 1 is not visible when viewed from the viewing side, and the low light emitting area F and the image area S appear to be integrated.

Hereinafter, each component which the display panel 10 with a front plate has will be described.
Examples of the display panel 1 include an FPD, specifically, an FPD used in an FPD device, such as an LCD, a PDP, and an organic EL (Electroluminescent) display (OELD).

  The size of the display panel 1 is not particularly limited, but as described above, the image area becomes smaller corresponding to the area where the first prism sheet 3 is disposed. Panel 1 is preferred. Depending on the width w3 of the first prism sheet 3, the size of the display panel 1 is the size of the light emitting region. The short side corresponding to w1 in FIG. 1B is 236 mm or more and the long side is 420 mm or more. A rectangular display panel 1 having a corner length of 482 mm or more is preferable. More preferably, the short side is 398 mm or more, the long side is 708 mm or more, and the diagonal length is 812 mm or more. The upper limit of the short side and the long side of the display panel 1 is not particularly limited, but the upper limit can be 1,955 mm for the short side, 3,476 mm for the long side, and 4,000 mm for the diagonal length.

  Further, the width w2 of the non-light emitting region in the display panel 1 is preferably 20 mm or less, and more preferably 10 mm or less. The lower limit of the width w2 of the non-light emitting region is not particularly limited.

  The first prism sheet 3 provided in a frame shape inward from the position corresponding to the outer periphery of the light emitting region on the viewing-side main surface 1 a of the display panel 1 is the outermost portion of the light emitting region of the display panel 1. Utilizing light emission, it is designed not to diffuse substantially inward but to diffuse at least to the outer periphery of the transparent front plate 2 to form a frame-like low light emission region F of the transparent front plate 2. If it is a thing, it will not restrict | limit in particular.

  The first prism sheet 3 is preferably in the vicinity of the position corresponding to the outer periphery of the light emitting region, specifically, in the range of 2 mm or less from the outer periphery of the light emitting region to the inner side or the outer side, respectively. It is provided so as to coincide with a position corresponding to the outer periphery of. In FIG. 1B, x1 indicates the position of the outer periphery of the light emitting region of the display panel 1 and the position of the outer periphery of the first prism sheet 3 in this cross section. x2 indicates the position of the inner periphery of the first prism sheet 3. x3 indicates the position of the outer periphery of the transparent front plate 2, and x4 indicates the position on the non-viewing side main surface 2b of the transparent front plate 2 facing the position x2 on the viewing side main surface of the display panel 1.

  That is, the first prism sheet 3 is provided so as to be able to receive light emitted straight from the light emitting region of the display panel 1 toward the viewing side over the entire width w3. The first prism sheet 3 is designed so that incident light from the display panel 1 side diffuses into the range shown above when it passes through the first prism sheet 3 and exits. Specifically, like the prism sheet used in the embodiment shown in cross section in FIG. 4, it can be designed by adjusting the triangle arrangement and the inclination angle so that the incident light goes straight or refracts to a desired angle. is there.

  Here, when the emitted light from the first prism sheet 3 is represented by an angle, the light travels straight to the viewing side at an angle perpendicular to the viewing-side main surface 1a of the display panel 1, that is, approximately 90 degrees, at the inner end. In other words, the emitted light goes straight from the inner peripheral position x2 of the first prism sheet 3 to the position x4 on the non-viewing-side main surface 2b of the transparent front plate 2 facing the first prism sheet 3, and the light is substantially inside the x4. Does not spread. Here, the fact that light does not substantially diffuse inside x4 means that there is no light diffusion to the extent that an image can be visually recognized sufficiently clearly inside x4.

  The angle of the light emitted from the first prism sheet 3 is such that, at the outer end, the angle of the outward light with respect to the viewing-side main surface 1a of the display panel 1 is the position x1 on the outer periphery of the first prism sheet 3. It is preferable that the angle is substantially the same as an angle formed by a straight line connecting the outer peripheral position x3 of the transparent front plate 2 and the viewing-side main surface 1a of the display panel 1 (hereinafter referred to as “θ”). If the angle of light is smaller than θ, the amount of light reaching the transparent front plate 2 decreases, which is not preferable. If the angle of this light is larger than θ, the light does not diffuse to the outer periphery of the transparent front plate 2, the outside of the low light emission region F cannot be seen shining, and the light emitting body integrated with the display panel 10 with the front plate I can't feel it.

  The size of the first prism sheet 3 is not particularly limited as long as incident light can be diffused into the above range. However, the width w3 of the first prism sheet 3 is preferably as small as possible since the image area becomes smaller by the area where the first prism sheet 3 is provided. Specifically, the width w3 of the first prism sheet 3 is preferably 1 to 20 mm, and more preferably 3 to 10 mm. The height of the first prism sheet 3 depends on the distance t between the non-viewing-side main surface 2b of the transparent front plate 2 and the viewing-side main surface 1a of the display panel 1, but is 0.02 to 0.3 mm. Preferably, 0.05 to 0.15 mm is more preferable.

  The material of the first prism sheet 3 is not particularly limited. Specifically, glass, transparent resin, light diffusion resin, etc. are mentioned. A commercial product may be used as long as the design of light diffusion is suitable.

  A typical prism sheet has a structure in which a plurality of prisms in a columnar unit are arranged on one main surface of a base material having a constant thickness in parallel with each other at regular intervals, as shown in FIG. It has such an enlarged cross section. Such a prism sheet is usually formed with a certain width and length, and cut into a desired size before use. The arrangement of the first prism sheet 3 on the viewing-side main surface 1a of the display panel 1 is performed by using a prism sheet that has been cut to a predetermined size in advance, and the ridge lines of the prisms on the prism sheet are the sides of the display panel 1. Are arranged at predetermined positions in a frame shape so as to be parallel to each other. The arrangement of the first prism sheet 3 on the viewing-side main surface 1a of the display panel 1 is appropriately selected in consideration of adhesiveness, optical characteristics, durability, and the like. Done through. In the case of the pressure-sensitive adhesive, a removable (reworkable) pressure-sensitive adhesive is preferable. In addition, since there exists a thing with an adhesive in a commercially available prism sheet etc., you may use it as it is.

  As a material of the transparent front plate 2, if the transparent front plate 2 is transparent and the image quality viewed from the viewing side is not inferior to that of the case without the transparent front plate 2 when arranged on the viewing side of the display panel 1. Can be used without any particular restrictions. If necessary, it is preferable to use a display panel having rigidity for protecting the display panel 1 from an impact. Examples of such materials include glass, such as soda lime glass, chemically tempered glass, and the like, and transparent resins such as polycarbonate resin, polystyrene resin, aromatic polyester resin, acrylic resin, polyester resin, polyarylate resin, and halogenated bisphenol A. And an ethylene glycol polycondensate, acrylic urethane resin, halogenated aryl group-containing acrylic resin, and the like.

  Among these, glass is preferable from the viewpoint of price, workability, and texture. In addition, a transparent resin such as an acrylic resin is preferable because it can be integrally processed with the second prism sheet 4 described below.

  The optical properties of the transparent front plate 2 are defined by JIS Z8701 (1999), where the visible light transmittance Tv is 90% or more, the visible light reflectance Rv is 10% or less, the haze (cloudiness value) is 1% or less. The color coordinates (x, y) in the XYZ color system are preferably (x, y) = (0.310 ± 0.100, 0.317 ± 0.100). The transparent front plate 2 may be colored in a range that does not affect the image when a person visually recognizes it.

The shape of the transparent front plate 2 is a plate shape in which both main surfaces are flat, and the thickness is preferably 0.3 mm to 20 mm, more preferably 0.7 to 10 mm, and particularly preferably 1.1 to 5 mm. By being 0.3 mm or more, the display panel 1 can be sufficiently protected from impact. By being 20 mm or less, the weight of the transparent front plate 2 can be reduced.
The shape of both main surfaces 2a, 2b of the transparent front plate 2 is similar to that of both main surfaces 1a, 1b of the display panel 1, and the size is designed to be larger than the size of both main surfaces 1a, 1b of the display panel 1. Is done. The size of the transparent front plate 2 is preferably 1 to 20 mm larger than the short side of the display panel 1 in the short side, and more preferably 2 to 10 mm larger. Further, the long side of the transparent front plate 2 is preferably 1 to 20 mm larger than the long side of the display panel 1, and more preferably 2 to 10 mm larger.
In addition, it is preferable that the outer peripheral part of the transparent front plate 2 is chamfered by a normal method.

  The transparent front plate 2 is provided so that the distance t between the non-viewing side main surface 2b and the viewing side main surface 1a of the display panel 1 is preferably 0.5 to 15 mm, more preferably 2 to 10 mm.

  A frame provided on the non-viewing-side main surface 2b of the transparent front plate 2 with the vicinity of the position x3 on the outer periphery of the transparent front plate 2 as the outer periphery and the vicinity of the position x4 facing the inner periphery of the first prism sheet 3 as the inner periphery The shaped second prism sheet 4 is not particularly limited as long as it has a function of receiving the light diffused by the first prism sheet 3 and emitting it to the viewing side. By providing the second prism sheet 4 as described above, the entire image area S and the low emission area F having a width w5 on the outer side emit light when viewed from the viewing side, and can be visually recognized at the time of lighting. It becomes. Note that, as will be described below, the width of the second prism sheet 4 is substantially equal to the width w5 of the low light emission region F, so that the non-light emission region of the display panel 1 when viewed from the viewing side when turned off. Is not visually recognized, and the low light emission region F and the image region S appear to be integrated. Further, when the light is extinguished, the transparent front plate 2 can be seen three-dimensionally by the action of the second prism sheet 4 and the design is increased.

  The position of the outer periphery of the second prism sheet 4 is preferably provided in the range from the outer periphery position x3 of the transparent front plate 2 to 5 mm inward, and the outer periphery of the transparent front plate 2 is not chamfered. It is particularly preferable that the transparent front plate 2 is provided at the same position as the position x3 on the outer periphery. When the outer peripheral portion of the transparent front plate 2 is chamfered, it is particularly preferable that the flat surface of the non-viewing-side main surface 2b of the transparent front plate 2 is provided at the same position as the boundary that is curved at the outer peripheral portion.

  The position of the inner periphery of the second prism sheet 4 is in the vicinity of the position x4 facing the inner periphery of the first prism sheet 3, specifically, from the position x4 facing the inner periphery of the first prism sheet 3. It is preferably provided so as to coincide with a position x4 facing the inner periphery of the first prism sheet 3 so that it is in the range of 3 mm or less on the inner side or the outer side, respectively. In the display panel 10 with the front plate shown in FIG. 1, the outer periphery of the second prism sheet 4 is the same position as the position x3 of the outer periphery of the transparent front plate 2, and the inner periphery faces the inner periphery of the first prism sheet 3. It is provided at the same position as the position x4. In this case, the width of the second prism sheet 4 is equal to the width w5 of the low light emission region F.

  The emitted light from the second prism sheet 4 only needs to be emitted toward the viewing side, preferably light that travels substantially straight to the viewing side, specifically, the viewing-side main surface of the transparent front plate 2. The angle formed by 2a and the optical path is 90 ° ± 3 °, more preferably light that is orthogonal to the viewing-side main surface 2a of the transparent front plate 2. The angle of the emitted light can be adjusted by appropriately designing the second prism sheet 4 by a conventionally known method. Specifically, the second prism sheet 4 is configured so that the light received through the first prism sheet 3 passes through the second prism sheet 4 and exits the transparent front plate 2 at the above angle. It is designed to enter from the viewing side main surface 2b and exit from the viewing side main surface 2a.

  Regarding the size of the second prism sheet 4, the width is the width of the first prism sheet 3, the size of the transparent front plate 2, the viewing side main surface 1 a of the display panel 1 and the non-viewing side main of the transparent front plate 2. It is almost determined by the distance t with the surface 2b. The height of the second prism sheet 4 is not particularly limited as long as the height of the first prism sheet 3 and the second prism sheet 4 have the above functions. It is appropriately selected according to the distance t between the viewing-side main surface 1a of the display panel 1 and the non-viewing-side main surface 2b of the transparent front plate 2. Specifically, the height of the second prism sheet 4 is preferably 0.02 to 0.3 mm, and more preferably 0.05 to 0.2 mm.

  The material of the second prism sheet 4 is not particularly limited. Specifically, glass, transparent resin, diffusion resin, etc. are mentioned. A commercial product may be used as long as the design of light diffusion is suitable.

The arrangement of the second prism sheet 4 on the non-viewing-side main surface 2b of the transparent front plate 2 is appropriately selected in consideration of adhesiveness, optical characteristics, durability, and the like. Done through.
From the viewpoints of workability and durability, diffusion bonding and diffusion adhesion are preferably used. Diffusion adhesion and diffusion adhesion are adhesion or adhesion materials mixed with a filler for light scattering. In the case of an adhesive, it is more preferable to have removability (reworkability). In addition, since there exists a thing with an adhesive in a commercially available prism sheet etc., you may use it as it is.

  2 is a plan view of the transparent front plate 2 of the display panel with a front plate 10 shown in FIG. 1 as viewed from the display panel 1 side, and the second prism sheet 4 on the non-viewing-side main surface 2b of the transparent front plate 2. It is a figure which shows the example of arrangement | positioning. The second prism sheet 4 is provided in a frame shape as described above. Specifically, also for the second prism sheet 4, as in the first prism sheet 3, a prism sheet previously cut to a predetermined size is used, and the ridge line of the prism on the prism sheet is the transparent front plate 2. It is arranged at a predetermined position in a frame shape so as to be parallel to each side.

  At this time, the prism sheet on the long side and the prism sheet on the short side are joined at the four corners. In consideration of design, the four corners are joined by the second prism sheet 4 arranged on the short side and the second side arranged on the long side as shown in FIG. It is preferable to cut the ends of the prism sheet 4 so that the inner peripheral end is shorter than the outer peripheral end so that the angle of the cut edge is 45 degrees and join the pieces. Alternatively, as shown in FIG. 2B2, for example, the second prism sheet 4 on the long side has a short side so that the second prism sheet 4 on the short side reaches the outer periphery of the transparent front plate 2. You may cut and join to the length to the position which reaches the 2nd prism sheet 4 of the side.

  In FIG. 2 (b2), the second prism sheet 4 on the short side is cut to a length that reaches the outer periphery of the transparent front plate 2. On the other hand, The second prism sheet 4 is cut to a length that reaches the outer periphery of the transparent front plate 2, and the second prism sheet 4 on the short side is cut to a length that reaches the second prism sheet 4 on the long side. And may be joined. Here, the shape of the four prism sheets joined in the first prism sheet 3 can be the same as that shown in FIGS. 2B1 and 2B2 in the second prism sheet 4. FIG. . In the display panel 10 with the front plate, it is preferable that the joint shape of the four corners of the second prism sheet 4 and the joint shape of the first prism sheet 3 are the same.

In the display panel with a front plate 10 according to the embodiment of the present invention, a diffusion plate may be used instead of the second prism sheet 4 according to required specifications. When the diffusion plate is used, the size (width), the arrangement position of the transparent front plate 2 on the non-viewing-side main surface 2b, the bonding method, and the like can be the same as those of the second prism sheet 4.
The diffusion plate is not particularly limited as long as it is a plate-like molded product having a function of diffusing light, and specific examples include a milky white film, a tracing film, and a non-glare film. Examples of the material of the diffusion plate include polyethylene terephthalate (PET) and acrylic resin. The thickness of the diffusion plate is preferably 0.025 to 1 mm, and more preferably 0.05 to 0.2 mm. Further, the haze value indicating the diffusion ability is preferably 20 to 90%, more preferably 50 to 80%.

In the display panel with a front plate according to the embodiment of the present invention, the transparent front plate may be further provided with a film having various functions as a single layer or a laminated layer. In FIG. 3, the top view seen from the display panel side of the transparent front plate in another example of embodiment of the display panel with a front plate of this invention, and sectional drawing of a long side direction are shown.
As shown in FIG.3 (b), in this embodiment, the transparent front plate 2 has the functional film 5 on the visual recognition side main surface 2a. Moreover, in this embodiment, the outer peripheral part of the transparent front plate 2 is chamfered. Therefore, the outer periphery of the second prism sheet 4 is located slightly inside the outer peripheral position of the transparent front plate 2, specifically, within the range shown above. Even in this case, the display panel 1 and the first prism sheet 3 can be designed in the same manner as described above, and the frame having the width w5 outside the image region S (the region indicated by the length L1 in the long side direction). The light emission in the region is lower than that of the image region S, but becomes a low light emission region that emits light as a whole.

  Such a functional film 5 is preferably provided as a film having at least a near-infrared shielding function, particularly when the display panel 1 is a PDP. Examples of the various functions of the functional film 5 include an electromagnetic wave shielding function, a color tone function, an antireflection function, a contrast improving function, an antiglare function (antiglare function) and the like in addition to the near infrared shielding function. The functional film 5 can be formed by a conventionally known method. In addition, the main surface of the transparent front plate 2 on which the functional film 5 is formed may be the non-viewing-side main surface 2b as necessary, or may be formed on both main surfaces. The area where the functional film 5 is formed is the entire inner side of the area where the second prism sheet or the diffusion plate is disposed on the non-viewing-side main surface 2b (range indicated by L1 in FIG. 3B). The viewing-side main surface 2a is preferably up to the outermost periphery of the transparent front plate.

  As described above, the display panel 10 with the front plate has been described as an example of the embodiment of the present invention. However, the configuration of the display panel with the front plate of the present invention is not limited to these, and the required characteristics are within the limits of the gist of the present invention. It can change suitably according to etc.

  As an application of the display panel with a front plate of the present invention, a flat display television can be cited as an application in which the image region can be allowed to be slightly reduced and the display can be integrated. The display panel with a front plate of the present invention is particularly suitable for a large-sized flat display television.

  Examples of the present invention will be described below. The present invention is not limited to these examples.

(Example 1)
Test samples for evaluating the display panel with a front plate having the configuration shown in FIG. 1 were prepared, and the design properties during lighting and extinguishing were evaluated.
As the display panel 1, a commercially available LCD panel (light emitting area (hereinafter referred to as “original light emitting area”): 314 mm × 519 mm) is pasted with a black light-shielding tape having a width of 20 mm from the outer periphery to the inner side of the original light emitting area. Thus, a light emitting area (indicated by w1 in FIG. 1, hereinafter simply referred to as a light emitting area) adjusted to 274 mm × 479 mm was prepared.

  The frame-like region having a width of 10 mm inside the masking corresponds to a non-light emitting region (indicated by w2 in FIG. 1) in the display panel with a front panel having the configuration shown in FIG. That is, in Example 1, a size of 294 mm × 499 mm was assumed as the overall size of the display panel 1 including the light emitting region and the non-light emitting region. Further, 10 mm outside the masking masks the light emission of the original light emitting region in order to assume a portion where the display panel 1 does not exist.

  In the display panel 1 manufactured for the test in this way, the inner periphery of the non-light emitting region and the outer periphery of the first prism sheet 3 are aligned inside the frame-shaped non-light emitting region having a width of 10 mm. A 10 mm first prism sheet 3 was attached. Specifically, a prism sheet whose enlarged cross-sectional view is shown in FIG. 4 is cut in advance so as to have a width of 10 mm, and the first prism sheet 3 has a prism ridge line parallel to each side of the display panel 1 and a prism. It arrange | positioned in said position so that the side with a steep inclination of a triangle might become an outer side, and it adhere | attached with the transparent adhesive sheet (25 micrometers thickness). In addition, the joining shape of 4 corners was made into the shape shown by FIG.2 (b1). The first prism sheet was an Arisawa Seisakusho prism sheet having a refractive index of 1.51 at a wavelength of 589 nm.

  A glass substrate having a length of 314 mm, a width of 519 mm, and a thickness of 2 mm was prepared as the transparent front plate 2. The size of the transparent front plate 2 is 60 mm larger in both length and width than the size of the light emitting area of the display panel 1, and when used in combination, the outer periphery of the transparent substrate 2 is on one side of the light emitting area of the display panel 1. The configuration was located 30 mm from the outer periphery and 10 mm outside from the outer periphery of the non-light emitting area.

  As the second prism sheet 4, the prism sheet shown in FIG. 4 is cut in advance so as to have a width of 30 mm, and the position of the outer periphery of the transparent front plate 2 is set as the outer periphery. Were arranged in parallel with each other so that the side of the prism triangle having a gentle slope was on the outside, and adhered by a transparent adhesive sheet (25 μm thick). In addition, the joining shape of 4 corners was made into the shape shown by FIG.2 (b1).

  The distance t between the viewing-side main surface 1a of the display panel 1 and the non-viewing-side main surface 2b of the transparent front plate 2 is 5 mm so that the center of the transparent front plate 2 is at the same position as the center of the display panel 1. It installed so that it might become, and the display panel 10A with a front plate was obtained. In the display panel 10A with the front plate, the image area S is 254 mm × 459 mm, and the width w5 of the low light emission area F is 30 mm, which is the same as the width of the second prism sheet 4.

  The display panel 1 of the obtained display panel with a front panel 10A was turned on, and the light emission state of the transparent front panel 2 was observed from the viewing side. As a result, in the central image region S (254 mm × 459 mm), an image similar to the state without the transparent front plate 2 was seen. Further, the low light emission area F outside the image area S appeared to emit light with a weaker light amount than the image area S. Further, when the light is turned off, the non-light-emitting area of the display panel 1 is not visually recognized when viewed from the viewing side, and the low light-emitting area F and the image area S appear to be integrated, and the transparent prism is caused by the action of the second prism sheet 4. 2 looked three-dimensional (like wide chamfering), and the design was increased.

(Example 2)
A display panel 1 having a light emitting area of 274 mm × 479 mm in the center and a non-light emitting area of 10 mm in a frame shape on the outside using a commercially available LCD and black light shielding tape as the display panel 1 A panel (equivalent) was prepared. The first prism sheet 3 was bonded to the display panel 1 in the same manner as in Example 1. A glass substrate having a length of 298 mm, a width of 503 mm, and a thickness of 2 mm was prepared as the transparent front plate 2. The size of the transparent substrate 2 is 24 mm larger in length and width than the size of the light emitting area of the display panel 1, and when used in combination, the outer periphery of the transparent substrate 2 is one side and the outer circumference of the light emitting area of the display panel 1. 12 mm from the outer periphery and 2 mm outside from the outer periphery of the non-light emitting area. The second prism sheet 4 was bonded to the transparent substrate 2 in the same manner as in Example 1 except that the width of the second prism sheet 4 was 22 mm.

  The distance t between the viewing-side main surface 1a of the display panel 1 and the non-viewing-side main surface 2b of the transparent front plate 2 is 5 mm so that the center of the transparent front plate 2 is at the same position as the center of the display panel 1. It installed so that it might become, and the display panel 10B with a front plate was obtained. In the display panel 10B with the front plate, the image area S is 254 mm × 459 mm, and the width w5 of the low light emission area F is 22 mm, which is the same as the width of the second prism sheet 4.

  The display panel 1 of the obtained display panel with a front panel 10B was turned on, and the light emission state of the transparent front panel 2 was observed from the viewing side. As a result, in the central image region S (254 mm × 459 mm), an image similar to the state without the transparent front plate 2 was seen. Further, the low light emission area F outside the image area S appeared to emit light with a weaker light amount than the image area S. Further, when the light is turned off, the non-light-emitting area of the display panel 1 is not visually recognized when viewed from the viewing side, and has a concealing effect. Moreover, the transparent front plate 2 was seen three-dimensionally by the action of the second prism sheet 4, and the design was increased.

(Example 3)
A display panel with a front plate is the same as in Example 2 except that the second prism sheet 4 is changed to a diffusion plate of the same size (thickness 0.1 mm, manufactured by Arisawa Manufacturing Co., Ltd., haze value 50%). 10C was obtained. In the display panel with front panel 10C, the image area S is 254 mm × 459 mm, and the width w5 of the low light emission area F is 22 mm, which is the same as the width of the diffusion plate.

  The display panel 1 of the obtained display panel with a front panel 10C was turned on, and the light emission state of the transparent front panel 2 was observed from the viewing side. As a result, in the central image region S (254 mm × 459 mm), an image similar to the state without the transparent front plate 2 was seen. In addition, the low light emission area F outside the image area S has a weak light intensity compared to the image area S, and the light emission intensity is weaker than the low light emission area F of Example 2, and the entire light emission area F seemed to emit light. . Further, when the light was turned off, the non-light emitting area of the display panel 1 was not visually recognized as viewed from the viewing side.

(Example 4)
In Example 2, the second prism sheet 4 was adhered in the same manner as in Example 2 except that the second prism sheet 4 was diffusion bonded with a diffusion adhesive sheet (thickness 25 μm, haze value 75%, TD06D0175 (trade name, manufactured by TOMO EGAWA)). An attached display panel 10D was obtained. In the front panel display panel 10D, the image area S is 254 mm × 459 mm, and the width w5 of the low light emission area F is 22 mm, which is the same as the width of the second prism sheet 4.

  The display panel 1 of the obtained display panel with a front panel 10D was turned on, and the light emission state of the transparent front panel 2 was observed from the viewing side. As a result, in the central image region S (254 mm × 459 mm), an image similar to the state without the transparent front plate 2 was seen. In addition, the low light emission region F outside the image region S appeared to emit light with less light than the image region S and evenly as compared with Examples 1 to 3. Further, when the light is turned off, the non-light-emitting area of the display panel 1 is not visually recognized when viewed from the viewing side, and has a concealing effect.

  The present invention can be applied to, for example, an FPD device using a liquid crystal display, a plasma display, an organic EL display, or the like, and is particularly suitable for an FPD device for a large TV.

DESCRIPTION OF SYMBOLS 10 ... Display panel with a front plate, 1 ... Display panel, 2 ... Transparent front plate, 3 ... 1st prism sheet, 4 ... 2nd prism sheet, 5 ... Functional film

Claims (3)

A display panel in which a central portion is a light emitting region on a main surface on the viewing side, and a frame-shaped portion outside the light emitting region is a non-light emitting region;
On the viewing side of the display panel, a transparent front plate disposed with a predetermined distance so that a main surface having a larger area and a similar shape than the main surface of the display panel faces the main surface of the display panel;
On the main surface on the viewing side of the display panel, from the vicinity of the position corresponding to the outer periphery of the light emitting region to the inside, the light emitted from the display panel is set as incident light and light is emitted toward the transparent front plate. , A first prism sheet arranged in a frame shape,
The emitted light is not substantially diffused inward from a position corresponding to the inner circumference of the first prism sheet on the main surface of the transparent front plate, and is diffused at least to the outer circumference of the transparent front plate. A first prism sheet designed;
On the main surface of the transparent front plate facing the display panel, the vicinity of the outer peripheral position of the transparent front plate is the outer periphery, and the vicinity of the position facing the inner periphery of the first prism sheet is the inner periphery . A prism- shaped second prism sheet or diffuser plate disposed with a distance of 1.65 to 9.9 mm from the prism sheet of
A display panel with a front plate.   The display panel with a front plate according to claim 1, wherein the light emitted from the second prism sheet is light that travels substantially straight toward the viewing side.   The display panel with a front plate according to claim 1, which is used for a flat display television.

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