JP2009128730A - Optical member, light source device, and display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical member capable of making the thickness of periphery of both parallel sides opposed to each other thin, and to provide a light source device and a display device. <P>SOLUTION: The optical member is equipped with an incident plane 11 on which external light is made incident, and a light emitting plane 12 which makes the light incident from the incident plane 11 be emitted to the outside, and is formed in such a way that the angle of incidence of light on the light emitting plane 12, incident from the incident plane 11 and having reached the light emitting plane 12 without reflection on the boundary with the outside, gets larger than the total reflection angle. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an optical member, a light source device, and a display device. More specifically, the present invention relates to an optical member that adjusts characteristics of light emitted from a light source, and a light source device and a display device that include the optical member.

  A display device including a non-self-luminous display panel such as a transmissive or transflective liquid crystal display panel generally has a configuration in which a light source is disposed on the back side or side surface of the display panel, or a light source is incorporated. Provided with a light source device (sometimes referred to as a backlight device, a backlight unit, etc.). An image can be displayed in a visible state on the front side of the display panel by irradiating the light emitted from the light source to the back side of the display panel and transmitting the light to the front side.

  FIG. 10 is an exploded perspective view schematically showing a conventional example of the configuration of the liquid crystal display device 9 including a direct type light source device. The display device 9 shown in FIG. 10 includes a light source 91 and an optical member (sometimes referred to as an optical sheet) 92 that adjusts characteristics of light emitted from the light source 91. The display device 9 includes a display panel 93. And the optical member 92 is arrange | positioned between the light source 91 and the display panel 93. Therefore, the characteristics of the light emitted from the light source 91 are adjusted by the optical member (optical sheet) 92, and the light whose characteristics are adjusted is irradiated on the back side of the display panel 93.

  In order to realize high-quality image display in the display device 9 including the light source device having such a configuration, it is preferable that the intensity in the surface direction of light emitted from the light source device is uniform. Therefore, in a conventional general direct type light source device, the light sources 91 are arranged at equal intervals, and light emitted from the light source 91 on the front side of the light source 91 (that is, between the light source 91 and the display panel 93). An optical member (optical sheet) 92 having a function of diffusing light is disposed. With such a configuration, the intensity in the surface direction of the light irradiated on the back side of the display panel 93 is made uniform.

  As shown in FIG. 10, the general display device 9 is provided with a bezel 94 on the front side of a display panel 93 that displays an image. The bezel 94 is a frame-shaped member, and has a function of supporting the periphery of the display panel 93 and a function of protecting the display panel 93.

  By the way, as a usage mode of the display device 9, two or more display devices may be arranged side by side and one image may be displayed by the two or more display devices 9. However, in such a usage mode, the images appear to be interrupted by the bezel 94 of each display device 9. That is, when two or more display devices 9 are arranged side by side to display a single image, the displayed images are discontinuous by the bezel 94 of each display device 9.

  As described above, when two or more display devices are used side by side, there is a demand for displaying images so as not to be discontinuous as much as possible. As a configuration for satisfying such a demand, for example, a configuration in which another display device having a thin bezel is provided between adjacent display devices is conceivable. The other display device hides the bezels of two adjacent display devices and displays an image, thereby displaying one image substantially continuously on a plurality of display devices.

  When such another display device is used, it is necessary to make the bezel of the other display device thinner and to reduce the thickness of the side adjacent to the two display devices. That is, if the thickness of this other display device is large, the screen of this other display device protrudes largely from the screens of two adjacent display devices to the front side. Therefore, as a result, there is a possibility that the image cannot be continuously viewed as one image. As described above, a light source device and a display device in which at least two opposite sides (that is, sides adjacent to the two display devices) are thin are required.

  As described above, in the conventional general direct type light source device, the light sources are arranged substantially evenly in order to make the intensity in the plane direction of light uniform. Therefore, it is difficult to achieve both reduction in the thickness of the opposite sides and equalization of the intensity in the surface direction of light. Further, the side light (also referred to as edge light) type light source device can reduce the thickness of the side where the light source is not provided, but reduces the thickness of the side where the light source is provided. It is difficult.

Japanese Patent Laid-Open No. 5-27238 JP-A-5-93911 JP-A-8-201633 JP-A-8-271886

  In view of the above circumstances, the problem to be solved by the present invention is to provide an optical member, a light source device, and a display device capable of reducing the thickness in the vicinity of opposite parallel sides, or to face each other. It is an object to provide an optical member, a light source device, and a display device capable of displaying an image with uniform brightness while reducing the thickness in the vicinity of both parallel sides.

  In order to solve the above-mentioned problems, the present invention includes an incident surface on which external light is incident and an exit surface that emits light incident on the incident surface to the outside, and is incident on the boundary between the incident surface and the outside. The gist of the light that reaches the exit surface without being reflected is formed such that the incident angle on the exit surface is larger than the total reflection angle. The total reflection angle refers to the minimum value of the incident angle at which incident light causes total reflection on the certain surface when the light is incident on the certain surface.

  Here, it is preferable that a convex incident portion is formed on a surface opposite to the emission surface, and the incident surface is formed on the incident portion.

  The thickness at both ends in the predetermined side direction is thicker than the thickness at the approximate center in the predetermined side direction, and the thickness gradually decreases from the center in the predetermined side direction toward both ends of the predetermined side. It is preferable.

  Both ends of the predetermined side direction of the surface on the opposite side of the emission surface are surface properties that are more likely to diffusely reflect light than the vicinity of the center of the predetermined side direction on the opposite side of the emission surface. It is preferable to have.

  In other words, the present invention includes an incident portion where an incident surface for introducing external light into the interior is formed, and an exit surface from which light incident from the incident portion exits to the outside, and the incident portion is the exit surface Projecting in a convex shape with a predetermined angle from the surface on the opposite side, and the predetermined angle of the incident portion is the angle of the light incident on the incident surface and not reflected at the boundary with the outside, The gist of the invention is that the incident angle on the exit surface is an angle that is larger than the total reflection angle on the exit surface.

  Here, the thickness at both ends in the predetermined side direction is thicker than the thickness at the approximate center in the predetermined side direction, and gradually increases from the predetermined side direction center toward both ends of the predetermined side. Is preferably thin.

  Both ends of the predetermined side direction of the surface on the opposite side of the emission surface are surface properties that are more likely to diffusely reflect light than the vicinity of the center of the predetermined side direction on the opposite side of the emission surface. It is preferable to have.

  A light source device according to the present invention includes any one of the optical members and a light source, and the light source is disposed to face the incident surface of the optical member.

  The present invention includes the light source device and a transmissive or transflective display panel that displays an image, and the display panel is disposed to face the emission surface of the optical member of the light source device. Is a summary.

  According to the present invention, among the light incident from the incident surface, the light that reaches the output surface directly (that is, without being reflected at the boundary with the outside) has an incident angle with respect to the output surface that is greater than the total reflection angle. Also grows. Therefore, all such light is reflected on the exit surface and does not exit to the outside from the exit surface. Therefore, since the light directly reaching from the light source is not emitted, the intensity in the surface direction of the light emitted from the emission surface to the outside can be made uniform.

  Then, by forming the incident portion at, for example, the approximate center in the short side direction, the thickness of the optical member in the vicinity of both ends in the short side direction (that is, the opposing long sides) can be reduced.

  Further, the thickness at both ends in the predetermined side direction is thicker than the thickness of the approximate center in the predetermined side direction, and the thickness gradually increases from the center in the predetermined side direction toward both ends of the predetermined side. If it becomes the structure which becomes thin, the thickness of the both sides which oppose can be made thin.

  Both ends of the predetermined side direction of the surface on the opposite side of the emission surface are surface properties that are more likely to diffusely reflect light than the vicinity of the center of the predetermined side direction on the opposite side of the emission surface. If it has, the intensity | strength of the surface direction of the light radiate | emitted outside from an output surface can be equalized.

  According to the light source device or the display device according to the present invention, the intensity of light in the surface direction can be made uniform. Accordingly, display quality can be improved. Furthermore, the thickness of the opposite sides can be reduced.

  Hereinafter, various embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is an external perspective view schematically showing the configuration of the optical member 1a according to the first embodiment of the present invention, and FIG. 1A is a view seen from the side facing the display panel, FIG.1 (b) is the figure seen from the opposite side of (a) (namely, from the side by which a light source is arrange | positioned).

  The optical member 1a according to the first embodiment of the present invention is integrally formed of a transparent or substantially transparent material. For example, they are integrally formed of a transparent acrylic resin or the like. The optical member 1a according to the first embodiment of the present invention has a configuration applicable to a light source device including a plurality of (two in the present embodiment) linear light sources and a display device in which such a light source device is incorporated. . As the linear light source, for example, a fluorescent tube such as a cold cathode tube or a hot cathode tube can be suitably applied.

  As shown in FIG. 1A, the surface facing the display panel is formed in a substantially flat surface. This surface is referred to as “exit surface 12”.

  As shown in FIG. 1B, an incident portion 13 protruding in a convex shape is formed on the surface opposite to the emission surface 12. The convex incident portion 13 has a configuration that protrudes with a predetermined angle with respect to the emission surface 12. Specific angles will be described later. The incident portion 13 is formed with an incident surface 11 for introducing light emitted from a linear light source disposed outside the optical member 1a according to the first embodiment of the present invention. . Specifically, the end surface of the incident portion 13 protruding in a convex shape becomes the incident surface 11.

  Moreover, as shown in FIG.1 (b), the optical member 1a concerning 1st embodiment of this invention is formed in flat form with substantially uniform thickness except the part in which the incident part 13 is formed. And the convex two incident part 13 extended along a long side direction is formed in the approximate center of a short side direction. In other words, in the optical member 1a according to the first embodiment of the present invention, the cross-sectional shape of the surface perpendicular to the long side direction has a substantially “K” shape.

  The specific size and shape of the incident part 13 are set so as to satisfy the following conditions. FIG. 2 is a cross-sectional view schematically showing a cross-sectional shape of the optical member 1a according to the first embodiment of the present invention and a light path inside the optical member 1a according to the first embodiment of the present invention. This cross-sectional view is a cross-sectional view taken along a plane perpendicular to the long side of the optical member 1a according to the first embodiment of the present invention.

  Light emitted from the linear light source 2 enters the optical member 1 a according to the first embodiment of the present invention from the incident surface 11 of the incident portion 13. As shown by an arrow a in the drawing, a part of the light incident on the inside is directly reflected on the exit surface 12 without being reflected by the boundary surface between the optical member 1a and the outside air according to the first embodiment of the present invention. To reach. Here, as shown in FIG. 2, the incident angle θ of the light directly reaching the exit surface 12 from the entrance surface 11 with respect to the exit surface 12 is determined by the optical member 1 a according to the first embodiment of the present invention. It is set to be a value larger than the total reflection angle (critical angle).

  The total reflection angle (critical angle) here refers to the minimum value of the incident angle at which light undergoes total reflection on a certain surface when light is incident on the certain surface. This total reflection angle differs depending on the material of the optical member 1a according to the first embodiment of the present invention (and the refractive index of the outside air). Therefore, what is necessary is just to set the shape of the incident part 13 according to the material of the optical member 1a concerning 1st embodiment of this invention.

  For example, in the case where the optical member 1a according to the first embodiment of the present invention is formed from acrylic resin, the emission of light that enters from the incident surface 11 and reaches the emission surface 12 without being reflected at the boundary with the outside. What is necessary is just to set the incident angle with respect to the surface 12 so that it may become 42 degrees or more.

  If it sets in this way, a part of light which injected into the inside from the entrance plane 11 of the optical member 1a concerning 1st embodiment of this invention will be directly (that is, the optics concerning 1st embodiment of this invention). The light reaches the emission surface 12 (without reflection at the boundary between the member 1a and the outside air). As described above, since the incident angle of such light on the emission surface 12 is larger than the total reflection angle of the optical member 1a according to the first embodiment of the present invention, all such light is reflected on the emission surface 12. To do. That is, since light that has directly reached the exit surface 12 from the entrance surface 11 (light that has reached the exit surface without being reflected at any point) is reflected entirely by the exit surface 12, such light is emitted from the exit surface 12. The light is not emitted from 12 to the outside.

  Then, the light reflected on the emission surface 12 is reflected at any location on the boundary between the optical member 1a and the outside air according to the first embodiment of the present invention, and finally exits from the emission surface 12 to the outside. . Light other than such light is finally emitted from the emission surface 12 to the outside while being reflected at any location on the boundary between the optical member 1a and the outside air according to the first embodiment of the present invention.

  Thus, all the light emitted to the outside from the emission surface 12 is light reflected at any location, and there is no light that exits from the emission surface 12 without being reflected at any location. Therefore, when viewed from the emission surface 12 side, the linear light source 2 is not directly visible. For this reason, a so-called lamp image can be prevented from appearing, and a portion where the light emitted from the emission surface 12 becomes locally strong can be eliminated.

  Further, the vicinity of the long side of the surface opposite to the emission surface 12 is formed so as to diffusely reflect light. Specifically, the surface roughness is gradually increased from the center in the short side direction toward both ends (both long sides). When formed in this way, the degree of irregular reflection of light gradually increases from the center toward the long side.

  According to such a configuration, it is possible to eliminate unevenness in intensity of light emitted from the emission surface 12. That is, if the surface property of the surface is uniform, the light near the center in the short side direction is near the distance from the light source 2, so that the light emitted from the emission surface 12 is strong, and as it goes toward both long sides, Since the distance from the light source 2 is increased, the light emitted from the emission surface 12 is weakened.

  Therefore, when the surface of the surface opposite to the emission surface 12 is formed so as to become rougher from the center in the short side direction toward both ends (both long sides), the light near the center in the short side direction Is sent to both ends without irregular reflection (the degree of irregular reflection is low). In the vicinity of both ends, light is irregularly reflected and emitted from the emission surface 12.

  As described above, the surface property of the portion on the opposite side of the emission surface 12 near the light source 2 (that is, near the center in the short side direction) is formed so as to be less likely to diffusely reflect the light. It is formed into a property that is easily diffusely reflected. According to such a configuration, the difference in the intensity of light emitted from the emission surface 12 is small between the vicinity of the center in the short side direction and the vicinity of the long side. For this reason, uniform light can be emitted over the entire surface of the emission surface 12.

  Next, the optical member 1b according to the second embodiment of the present invention will be described. FIG. 3 is an external perspective view schematically showing the configuration of the optical member 1b according to the second embodiment of the present invention, and FIG. 3A is a view as seen from the side facing the display panel, FIG.3 (b) is the figure seen from the opposite side of (a) (namely, from the side by which a light source is arrange | positioned). In addition, about the structure which is common in the optical member 1a concerning said 1st embodiment, the same code | symbol is attached | subjected and shown, and description may be abbreviate | omitted.

  The optical member 1b according to the second embodiment of the present invention is also integrally formed of a transparent or substantially transparent material. For example, they are integrally formed of a transparent acrylic resin or the like. The optical member 1b according to the second embodiment of the present invention has a configuration applicable to a light source device including a plurality of (two in the present embodiment) linear light sources and a display device in which such a light source device is incorporated. .

  As shown in FIG. 3A, the surface facing the display panel is formed in a substantially flat surface. This surface is referred to as “exit surface 12”.

  As shown in FIG. 3B, an incident portion 13 protruding in a convex shape is formed on the surface opposite to the emission surface 12. The convex incident portion 13 has a configuration that protrudes with a predetermined angle with respect to the emission surface 12. Specific angles will be described later. The incident portion 13 is formed with an incident surface 11 for introducing light emitted from the linear light source 2 disposed outside the optical member 1b according to the second embodiment of the present invention. The Specifically, the end surface of the incident portion 13 protruding in a convex shape becomes the incident surface.

  Further, as shown in FIG. 3B, the optical member 1b according to the second embodiment of the present invention has a thick center in the predetermined side direction (in the second embodiment of the present invention, the approximate center in the short side direction). Is formed). And it forms so that thickness may become thin gradually as it goes to another predetermined side (it goes to both long sides in the second embodiment of the present invention).

  In other words, the optical member 1b according to the second embodiment of the present invention has a substantially obtuse angle isosceles triangle cross-sectional shape with a low height, and a convex incident portion 13 is formed in the vicinity of the obtuse angle. Have

  The specific size and shape of the incident part 13 are set so as to satisfy the following conditions. FIG. 4 is a cross-sectional view schematically showing a cross-sectional shape of the optical member 1b according to the second embodiment of the present invention and a light path inside the optical member 1b according to the second embodiment of the present invention. This cross-sectional view is a cross-sectional view taken along a plane perpendicular to the long side of the optical member 1b according to the second embodiment of the present invention.

  Light emitted from the linear light source 2 enters the inside of the optical member 1b according to the second embodiment of the present invention from the incident surface 11 of the incident portion 13. As shown by an arrow a in the drawing, a part of the light incident on the inside is directly reflected on the exit surface 12 without being reflected by the boundary surface between the optical member 1b and the outside air according to the second embodiment of the present invention. To reach. Here, as shown in FIG. 4, the incident angle θ of the light directly reaching the exit surface 12 from the entrance surface 11 with respect to the exit surface 12 is determined by the optical member 1 b according to the second embodiment of the present invention. It is set to be a value larger than the total reflection angle (critical angle). The definition of the total reflection angle (critical angle) is the same as that of the optical member 1a according to the first embodiment.

  With this setting, a part of the light incident on the inside from the incident surface 11 of the optical member 1b according to the second embodiment of the present invention is directly (that is, the optical according to the second embodiment of the present invention). The light reaches the emission surface 12 (without reflection at the boundary between the member 1b and the outside air). As described above, since the incident angle of such light on the emission surface 12 is larger than the total reflection angle of the optical member 1b according to the second embodiment of the present invention, all such light is reflected on the emission surface 12. To do. That is, since light that has directly reached the exit surface 12 from the entrance surface 11 (light that has reached the exit surface without being reflected at any point) is reflected entirely by the exit surface 12, such light is emitted from the exit surface 12. The light is not emitted from 12 to the outside.

  Then, the light reflected on the emission surface 12 is reflected at any location on the boundary between the optical member 1b and the outside air according to the second embodiment of the present invention, and finally exits from the emission surface 12 to the outside. . Light other than such light is finally emitted from the emission surface 12 to the outside while being reflected at any location on the boundary between the optical member 1b and the outside air according to the second embodiment of the present invention.

  Thus, according to the optical member 1b concerning 2nd embodiment, there can exist an effect similar to the optical member 1a concerning 1st embodiment.

  Further, the vicinity of the long side of the surface opposite to the emission surface 12 is formed so as to diffusely reflect light. Specifically, the surface roughness is gradually increased from the center in the short side direction toward both ends (both long sides). When formed in this way, the degree of irregular reflection of light gradually increases from the center toward the long side.

  According to such a configuration, it is possible to eliminate unevenness in intensity of light emitted from the emission surface 12. That is, if the surface property of the surface is uniform, the light near the center in the short side direction is near the distance from the light source 2, so that the light emitted from the emission surface 12 is strong, and as it goes toward both long sides, Since the distance from the light source 2 is increased, the light emitted from the emission surface 12 is weakened.

  Therefore, when the surface of the surface opposite to the emission surface 12 is formed so as to become rougher from the center in the short side direction toward both ends (both long sides), the light near the center in the short side direction Is sent to both ends without irregular reflection (the degree of irregular reflection is low). In the vicinity of both ends, light is irregularly reflected and emitted from the emission surface 12.

  As described above, the surface property of the portion on the opposite side of the emission surface 12 near the light source 2 (that is, near the center in the short side direction) is formed so as to be less likely to diffusely reflect the light. It is formed into a property that is easily diffusely reflected. According to such a configuration, the difference in the intensity of light emitted from the emission surface 12 is small between the vicinity of the center in the short side direction and the vicinity of the long side. For this reason, uniform light can be emitted over the entire surface of the emission surface 12.

  Moreover, the thickness of the part close | similar to the incident part 13 is formed thickly compared with both long side vicinity. For this reason, the light incident on the inside from the incident surface 11 of the incident portion 13 is easily sent to the vicinity of both long sides. That is, since the amount of light that passes (sends) can be increased in a portion that is thicker than the vicinity of both long sides, light is easily transmitted to the vicinity of both long sides. For this reason, unevenness in intensity of light emitted from the emission surface 12 can be suppressed in the vicinity of both long sides and the other portions.

  In addition, the shape of the optical member 1a concerning 1st embodiment of this invention and the optical member 1b concerning 2nd embodiment is not limited to the said shape. FIG. 5 is an external perspective view showing a modified example of the optical member, (a) is an external perspective view showing a modified example of the optical member 1a according to the first embodiment, and (b) is a second embodiment. It is the external appearance perspective view which showed the modification of the optical member 1b concerning a form.

  As shown in FIGS. 5A and 5B, the surface facing the exit surface of the incident portion 13 may be a substantially flat surface. Even if it is such a structure, there can exist an effect similar to the above. Further, if the configuration as shown in FIG. 5 is used, the optical members 1a and 1b have a simple shape, so that the molding becomes easy. For this reason, it is possible to reduce the cost of the optical members 1a and 1b. .

  Next, the light source device 3 including the optical members 1a and 1b according to any embodiment of the present invention will be described.

  FIG. 6 is an exploded perspective view schematically showing the configuration of the light source device 3 including the optical member 1b according to the second embodiment of the present invention. For convenience of explanation, the upper side of FIG. 6 is referred to as the front side of the light source device 3, and the lower side is referred to as the back side. In addition, the same members and configurations can be applied to the light source device including the optical member 1a according to the first embodiment and the light source device including the optical members 1a and 1b according to the modification of each embodiment except for the optical member. . Therefore, the description is omitted.

  As shown in FIG. 6, the light source device 3 including the optical member 1b according to the second embodiment of the present invention includes a chassis 31, a reflection sheet 32, a linear light source 2, a side holder 33, and the present invention. The optical member 1b according to the second embodiment, optical sheets 34, a frame 35, a light source driving circuit board 36, and a light source driving circuit board cover 37 are provided.

  As the reflection sheet 32, the linear light source 2, the optical sheets 34, the light source drive circuit board 36, and the light source drive circuit board cover 37, those having a conventionally known general configuration can be applied. Therefore, these will be described briefly and detailed description will be omitted.

  The chassis 31 is a substantially flat plate-like member, and is formed, for example, using a metal plate material or the like by pressing. As shown in FIG. 6, the bottom near the center in the short side direction is deep and the bottom near the long side is shallow. That is, it is formed in a shape that can cover the incident surface 11 side of the optical member 1b according to the second embodiment of the present invention.

  As the linear light source 2, various known linear light sources such as a fluorescent tube such as a cold cathode tube and a hot cathode tube, a discharge tube such as a xenon tube, and the like can be applied. Here, a configuration to which a linear cold cathode tube is applied is shown.

  The reflection sheet 32 is a sheet-like member or a plate-like member having a surface property that reflects light emitted from the linear light source 2. For example, foamed PET (polyethylene terephthalate) is used as the material of the reflection sheet 32. The reflection sheet 32 is formed in a shape that follows the shape on the back side of the optical member 1b according to the second embodiment of the present invention. However, it is not disposed between the incident surface 11 and the light source 2.

  The side holder 33 is a member that functions as a spacer or the like for disposing optical sheets 34 to be described later. These side holders 33 are substantially rod-shaped members, and have a configuration in which they are integrally formed of, for example, a resin material. As shown in FIG. 6, the side holder 33 is formed in such a shape that the thickness in the vicinity of the center is thick and becomes thinner toward both ends.

  The optical sheets 34 are a sheet-like member, a plate-like member, or a group of such members that adjust the characteristics of light emitted from the emission surface 12 of the optical member 1b according to the second embodiment of the present invention. It shall be said. As the optical sheets 34, for example, generally, a diffusion plate and a diffusion sheet having a function of diffusing light, a lens sheet having a condensing function, light in a predetermined vibration direction and light in other vibration directions are transmitted. There is a polarizing reflection sheet that reflects the light. And it arrange | positions so that it may select suitably according to the kind of light source device, etc., and is stacked | stacked in a predetermined order.

  The light source device 3 including the optical member 1b according to the second embodiment of the present invention includes, as the optical sheets 34, a diffusion plate, a diffusion sheet, a lens sheet, and a polarization reflection sheet. The optical sheets are arranged in the order of the diffusion plate, the diffusion sheet, the polarization reflection sheet, the lens sheet, and the diffusion sheet from the back side.

  The frame 35 is a member having a function of holding and / or protecting the optical sheet 34, a display panel (not shown) described later, and the like. The frame 35 has an open substantially quadrangular shape. And, for example, a structure that is integrally formed of a resin material, a structure in which a plurality of parts that are formed of a resin material are combined, a structure that is integrally formed by pressing from a metal plate, a press from metal plate For example, a configuration in which a plurality of parts formed using the above are combined can be applied.

  As shown in FIG. 6, the short side of the frame 35 is formed in such a shape that the thickness near the center increases, and the thickness increases toward both ends (both long sides).

  The light source drive circuit board 36 is a circuit board on which an electronic circuit or an electric circuit for driving the linear light source 2 is constructed. When, for example, a fluorescent tube is used as the linear light source 2, an inverter circuit for driving the fluorescent tube is constructed on the light source driving circuit board 36. The light source drive circuit board cover 37 is a plate-like member that covers the light source drive circuit board 36 and is formed of a conductor such as a metal plate material, for example. Thereby, the light source drive circuit board 36 is protected, and unnecessary radiation emitted from the light source drive circuit board 36 can be prevented or suppressed.

  The assembly structure of the light source device 3 provided with such a member is as follows.

  A reflection sheet 32 is disposed on the front side of the chassis 31. The light source 2 and the optical member 1b according to the second embodiment of the present invention are disposed on the front side. Here, as shown in FIG. 6, the reflection sheet 32 is disposed so as to be in contact with the side surface of the incident portion 13 of the optical member 1 b according to the second embodiment of the present invention, but does not cover the incident surface 11. . Therefore, the light emitted from the light source 2 enters the optical member 1b according to the second embodiment of the present invention from the incident surface 11.

  The side holder 33 is disposed so as to cover the end of the light source 2. Optical sheets 34 are disposed on the front side, and a frame 35 is mounted on the front side.

  A light source drive circuit board 36 is disposed on the rear side of the chassis 31, and a harness (not shown) drawn from each linear light source 2 is electrically connected to the light source drive circuit board 36. A light source drive circuit board cover 37 is attached to the chassis 31 so as to cover the light source drive circuit board 36.

  Next, the display device 4 including the light source device 3 will be described. FIG. 7 is an exploded perspective view schematically showing a configuration of a main part of a display device 4 (that is, a display device according to an embodiment of the present invention) including the light source device 3. The display device 4 according to the embodiment of the present invention includes the light source device 3 according to the embodiment of the present invention, a display panel 41, a bezel 42, a control circuit board 43, and a control circuit board cover 44.

  Various known transmissive or semi-transmissive liquid crystal display panels can be applied to the display panel 41. For example, a general active matrix type liquid crystal display panel can be applied.

  The bezel 42 is a member having a function of protecting and / or holding the display panel 41. The bezel 42 has an open substantially quadrilateral shape. For example, a structure that is integrally formed of a resin material, a structure in which parts formed of a resin material are combined, a structure that is integrally formed by pressing a metal plate material, and a press using a metal plate material A configuration in which parts formed by processing or the like are combined can be applied.

  As shown in FIG. 7, the short side of the bezel 42 is formed in such a shape that the thickness in the vicinity of the center is thick and the thickness is gradually reduced toward both ends (both long sides). In addition, each long side is formed thinner than the central part of the short side.

  The control circuit board 43 is a circuit board on which a circuit that generates a signal for controlling the display panel 41 is constructed. This signal is generated based on a signal input from the outside (for example, tuner). The control circuit board cover 44 is a member that covers the control circuit board 43, and is formed of a conductor such as metal. The control circuit board cover 44 has a function of protecting or preventing the control circuit board 43 and preventing or suppressing unnecessary radiation generated by the control circuit board 43.

  The assembling structure of the display device 4 including such a member is as follows.

  A display panel 41 is disposed on the front side of the light source device 3 according to the embodiment of the present invention. A circuit board (not shown) such as TCP attached to the display panel 41 is bent and arranged on the back side of the chassis 31 of the light source device 3 according to the embodiment of the present invention. Therefore, the thickness of each side of the display panel 41 can be reduced and the width of the frame can be reduced.

  In addition, a control circuit board 43 is disposed on the back surface of the light source device 3 according to the embodiment of the present invention, and a control circuit board cover 44 is mounted so as to cover the control circuit board 43. The control circuit board 43 and the control circuit board cover 44 are disposed in a thick part (that is, approximately the center in the short side direction) of the light source device 3 according to the embodiment of the present invention. By disposing at such a position, it is possible to prevent the thickness in the vicinity of the long side of the display device 4 from increasing.

  Next, the television receiver 5 including the display device 4 according to the embodiment of the present invention will be described. FIG. 8 is an exploded perspective view schematically showing a configuration of a main part of the television receiver 5 including the display device 4 according to the embodiment of the present invention.

  As shown in FIG. 8, the television receiver 5 includes the display device 4 according to the embodiment of the present invention, a tuner 51, a power source 52, cabinets 531 and 532, and a support member 54. As the tuner 51, the power source 52, and the support member 54, those conventionally used in general can be applied. Therefore, each of them will be briefly described, and detailed description thereof will be omitted.

  The tuner 51 generates received broadcast radio waves and an image signal of a predetermined channel input from the outside. The tuner 51 may be a conventional general terrestrial tuner (analog terrestrial tuner, digital terrestrial tuner), BS tuner, CS tuner, or the like. The power source 52 can supply power to the display device 4, the tuner 51, and the like according to the embodiment of the present invention.

  The display device 4, the tuner 51, and the power source 52 according to the embodiment of the present invention are housed in the cabinets 531 and 532 and supported by the support member 54. This cabinet includes a front side cabinet 531 and a back side cabinet 532. The front-side cabinet 531 is a member having a substantially quadrangular shape that is open, and is a frame-shaped member. The back side cabinet 532 is a substantially tray-like member, and has a shape such that the bottom near the center in the short side direction is deep and the bottom becomes shallower toward both ends (both long sides).

  FIG. 9 is a diagram illustrating an example of how the television receiver 5 including the display device 4 according to the embodiment of the present invention is used. As shown in FIG. 9, two television receivers (or display devices) 6 are arranged side by side, and the display device 4 according to the embodiment of the present invention or the display device 4 according to the embodiment of the present invention is incorporated between them. A television receiver 5 is provided.

  In such a usage mode, when one image is displayed on the two television receivers (or display devices) 6, the bezels of the two television receivers (or display devices) 6 can be hidden. . In other words, the display device 4 according to the embodiment of the present invention can display images displayed by the two television receivers (or display devices) 6 substantially seamlessly (that is, without giving the viewer a sense of incongruity). .

  In particular, since the display device 4 (including the television receiver 5) according to the embodiment of the present invention is thin on both sides facing each other, each screen of the two television receivers (or display devices) 6 The screen (that is, the display panel 41) with the display device 4 according to the embodiment of the invention is close. Therefore, when a single image is displayed using a plurality of television receivers (or display devices) 6, it is possible to relieve the uncomfortable feeling caused by the steps on the screen.

  The embodiment of the present invention has been described in detail above. However, the present invention is not limited to the embodiment described above, and various modifications can be made without departing from the spirit of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS It is the external appearance perspective view which showed typically the structure of the optical member concerning 1st embodiment of this invention, (a) is the figure seen from the display panel side, (b) is from the opposite side of (a). FIG. It is sectional drawing which showed typically the cross-sectional shape of the optical member concerning 1st embodiment of this invention, and the advancing state of the light in the inside. It is the external appearance perspective view which showed typically the structure of the optical member concerning 2nd embodiment of this invention, (a) is the figure seen from the display panel side, (b) is from the opposite side of (a). FIG. It is sectional drawing which showed typically the cross-sectional shape of the optical member concerning 2nd embodiment of this invention, and the advancing state of the light in the inside. (A) is the modification of the optical member concerning 1st embodiment of this invention, (b) is the figure which showed the modification of the optical member concerning 2nd embodiment of this invention. It is the disassembled perspective view which showed typically the structure of the light source device provided with the optical member concerning embodiment of this invention. It is the disassembled perspective view which showed typically the structure of the display apparatus provided with the light source device concerning embodiment of this invention. It is the disassembled perspective view which showed typically the structure of the television receiver incorporating the display apparatus provided with the light source device concerning embodiment of this invention. It is the external view which showed one of the usage conditions of a display apparatus provided with the light source device concerning embodiment of this invention. It is the disassembled perspective view which showed typically the prior art example of the structure of a display apparatus provided with a direct type light source device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a Optical member 1b concerning 1st embodiment of this invention Optical member concerning 2nd embodiment of this invention 11 Incident surface 12 Outgoing surface 13 Incident part 2 Light source 3 Light source device concerning embodiment of this invention 31 Chassis 32 Reflective sheet 33 Side holder 34 Optical sheet 35 Frame 36 Light source drive circuit board 37 Light source drive circuit board cover 4 Display device according to an embodiment of the present invention 41 Display panel 42 Bezel 43 Control circuit board 44 Control circuit board cover 5 Television receiver 51 Tuner 52 Power Supply 531 Front Side Cabinet 532 Back Side Cabinet 54 Support Member 6 Television Receiver (Display Device)
9 Conventional display device 91 Light source 92 Optical member 93 Display panel 94 Bezel

Claims (9)

  An incident surface on which external light is incident and an output surface that emits light incident from the incident surface to the outside, and the light that has entered the incident surface and has reached the output surface without being reflected at the boundary with the outside An optical member characterized in that the angle of incidence on the exit surface is larger than the total reflection angle.   The optical member according to claim 1, wherein a convex incident portion is formed on a surface opposite to the emission surface, and the incident surface is formed on the incident portion.   The thickness at both ends in the predetermined side direction is thicker than the thickness at the approximate center in the predetermined side direction, and the thickness gradually decreases from the center in the predetermined side direction toward both ends of the predetermined side. The optical member according to claim 1, wherein the optical member is an optical member.   Both ends of the predetermined side direction of the surface on the opposite side of the emission surface are surface properties that are more likely to diffusely reflect light than the vicinity of the center of the predetermined side direction on the opposite side of the emission surface. The optical member according to claim 1, comprising:   An incident portion formed with an incident surface for introducing external light into the interior; and an exit surface from which the light incident from the incident portion exits to the outside, the incident portion from a surface opposite to the exit surface The predetermined angle of the incident portion protrudes in a convex shape with a predetermined angle, and the incident angle of light incident on the output surface from the incident surface and reaching the output surface without being reflected at the boundary with the outside Is an angle that is larger than the total reflection angle on the exit surface.   The thickness at both ends in the predetermined side direction is thicker than the thickness at the approximate center in the predetermined side direction, and the thickness gradually decreases from the center in the predetermined side direction toward both ends of the predetermined side. The optical member according to claim 5.   Both ends of the predetermined side direction of the surface on the opposite side of the emission surface are surface properties that are more likely to diffusely reflect light than the vicinity of the center of the predetermined side direction on the opposite side of the emission surface. The optical member according to claim 5 or 6, characterized by comprising:   A light source device comprising: the optical member according to claim 1; and a light source, wherein the light source is disposed to face an incident surface of the optical member.   9. A light source device according to claim 8, and a transmissive or transflective display panel for displaying an image, wherein the display panel is disposed to face the emission surface of the optical member of the light source device. The display device according to claim 8.

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