JP2009289597A - Light source device, and display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light source device and a display device wherein optical members can be positioned while preventing or suppressing reduction in the number of the optical members (optical sheets) obtained from an original product (raw material sheet) of the optical members. <P>SOLUTION: The light source device has sheet-like optical members 12 to adjust characteristics of transmitted light, and plate-like optical members 11 to adjust the characteristics of the transmitted light. The sheet-like optical members 12 is formed in nearly a quadrangle and in the vicinity of the outer peripheral edge of at least one side out of four sides, and a through-hole-shaped engaging hole 121 is formed. The plate-like optical member 11 is formed in nearly the quadrangle, and in the vicinity of the outer peripheral edge of at least one side out of four sides, a convex engaging protrusion 111 is formed. The engaging hole 121 formed in the sheet-like optical member 12 is engaged with the engaging protrusion 111 formed in the plate-like optical member 11. Thereby, the sheet-like optical member 12 is positioned against the plate-shaped optical member 11. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a light source device and a display device, and more particularly, to a light source device capable of adjusting the characteristics of light and irradiating the back surface of a transmissive display panel or the like, and a display device including the light source device. Is.

  Some display devices including a non-self-luminous display panel such as a transmissive liquid crystal display panel have a configuration in which a light source device is disposed on the back side of the display panel. A light source device incorporated in such a display device includes a light source such as a fluorescent tube and an optical member that adjusts the characteristics of light emitted from the light source, and irradiates the rear surface of the display panel with the adjusted light. Can do. When the irradiated light passes through the display panel, an image is displayed in a visible state on the front side of the display panel.

  Optical members for adjusting the light characteristics include plate-like ones, sheet-like ones, and film-like ones. Among these, since the sheet-like or film-like optical member is thin and soft, wrinkles and deflection may occur. When wrinkles or deflections occur in a sheet-like or film-like optical member, the luminance distribution in the surface direction of light emitted from the light source device may be non-uniform. If the luminance distribution in the surface direction of the emitted light becomes non-uniform, luminance unevenness and shadows may appear on the front side of the display panel (that is, on the screen). Since such luminance unevenness and shading may reduce the display quality of the display device, it is preferable to keep the optical member free from wrinkles or deflection.

  As a cause of wrinkling or bending of the sheet-like or film-like optical member, for example, deviation from a predetermined position of the sheet-like or film-like optical member can be mentioned. That is, the sheet-like or film-like optical member may be displaced from a predetermined position by its own weight or other external force. If it does so, a wrinkle and a bending may generate | occur | produce in a sheet-like or film-like optical member. Therefore, it is preferable that the sheet-like or film-like optical member is positioned and supported so that the sheet-like or film-like optical member does not shift from a predetermined position.

  As a support structure for a sheet-like or film-like optical member, for example, the following configuration has been proposed. In Patent Document 1 and Patent Document 2, a protrusion is provided on the outer periphery of the optical member (optical sheet), and a groove is formed in a member such as a frame that supports the optical member, so that the optical member (optical sheet) is formed on the outer periphery. A configuration is disclosed in which a protrusion is fitted into a groove formed in a frame or the like.

  In Patent Document 3, a projection is formed on the outer periphery of the optical member (optical sheet), a through hole is formed in the projection, and a boss is loosely fitted in the through hole to hold the optical member (optical sheet). A configuration is disclosed. Patent Document 4 discloses a configuration in which a positioning piece is formed on the outer periphery of an optical member, a recess is formed in a member such as a frame, and the positioning piece is engaged with the recess.

  According to such a configuration, the sheet-like or film-like optical member is positioned by inserting the bosses into the through holes formed in the protrusions by fitting the protrusions into the grooves or the like. Supported. Therefore, according to such a configuration, it is possible to prevent or suppress the optical member (optical sheet) from being displaced from a predetermined position, and as a result, it is possible to prevent the optical member (optical sheet) from being wrinkled or bent. Can be suppressed.

  By the way, the configuration in which the protrusions and positioning pieces are formed on the outer periphery of the optical member may have the following problems. Generally, a sheet-like or film-like optical member incorporated in a light source device is obtained by cutting a large-area or long original product into a predetermined dimensional shape. When the original product is obtained by cutting as described above, the outer shape of the original product required for obtaining one optical member is increased when the protrusions and positioning pieces are formed on the outer periphery. For this reason, the number of optical members obtained from the original product is reduced, and a portion that is wasted in the original product (a portion that is cut off and discarded instead of being a final product) is generated. As a result, the cost of the optical member may increase.

JP 2003-35899 A JP 2006-114445 A Japanese Patent Laid-Open No. 11-337942 JP 2001-76527 A

  In view of the above circumstances, the problem to be solved by the present invention is to provide a light source device and a display device that can reduce waste of an optical member, or an original product (original fabric) of an optical member (optical sheet). It is intended to provide a light source device and a display device capable of positioning an optical member while preventing or suppressing a decrease in the number of optical members obtained from the above.

  In order to solve the above-described problems, the present invention provides a light source device having a sheet-like optical member that adjusts the characteristics of transmitted light and a plate-like optical member that adjusts the characteristics of transmitted light. The optical member is formed in a substantially quadrilateral shape, and a through-hole-like engagement hole is formed in the vicinity of the outer peripheral edge of at least one of the four sides. The plate-like optical member is formed in a substantially quadrangular shape and has four sides. A convex engagement protrusion is formed in the vicinity of the outer peripheral edge of at least one side, and an engagement hole formed in the sheet-like optical member engages with an engagement protrusion formed in the plate-like optical member. The gist is to do.

  Here, the engagement hole formed on at least one side of the four sides of the sheet-like optical member is formed at substantially the center of the one side, and is formed on at least one side of the four sides of the plate-like optical member. The engaging protrusion is preferably formed at the approximate center of the one side.

  Further, it is preferable that the sheet-like optical member is at least one of a polarization reflection sheet, a lens sheet, and a diffusion sheet, and the plate-like optical member is a diffusion plate.

  The gist of the present invention is to include the light source device and a liquid crystal display panel.

  According to the present invention, the engagement hole formed in the sheet-like or film-like optical member is engaged with the engagement protrusion formed in the plate-like optical member, so that the sheet-like or film-like optical member is obtained. Is positioned and held with respect to the plate-like optical member. Therefore, the sheet-like or film-like optical member is prevented or suppressed from being displaced relative to the plate-like optical member, and the sheet-like or film-like optical member caused by the displacement is prevented from wrinkling or bending. Can be suppressed.

  If the engagement hole formed on at least one side of the four sides of the sheet-like optical member is formed at the approximate center of the one side and engages, the sheet-like or film-like optical member is thermally expanded. In some cases, the expanded portion can extend outward. Therefore, it is possible to prevent or suppress the occurrence of wrinkles and deflection due to dimensional changes due to thermal expansion.

  The sheet-like or film-like optical member is at least one of a polarized reflection sheet, a lens sheet, and a diffusion sheet, and any plate-like optical member that is a diffusion plate is formed of a resin material. Therefore, since the coefficients of thermal expansion are close, it is possible to prevent or suppress the occurrence of wrinkles and deflection due to non-uniform thermal expansion.

  If it is the structure provided with such a light source device and a liquid crystal display panel, generation | occurrence | production of the brightness nonuniformity and shadow resulting from a wrinkle or bending of a sheet-like or film-like optical member on a screen can be prevented. Therefore, a display device with high display quality can be provided.

  Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an external perspective view schematically showing the configuration of optical members 11 and 12 according to an embodiment of the present invention.

  Of the optical members 11 and 12 according to the embodiment of the present invention, for example, a diffusion plate can be applied to the plate-like optical member 11. The diffusing plate is an optical member that can achieve uniform luminance distribution in the surface direction of light emitted from the light source by randomly diffusing transmitted light. For example, the diffusion plate has a configuration in which fine particles having a property of reflecting light are mixed with a base material made of a substantially transparent resin material. And it forms by injection molding etc.

  As shown in FIG. 1, an engagement protrusion 111 is formed on the plate-like optical member 11. These engagement protrusions 111 are protrusions that can be loosely engaged with engagement holes 121 formed in a sheet-like or film-like optical member 12 described later. These engagement protrusions 111 are formed on one side surface of the plate-like optical member 11 and are formed so as to protrude from the one-side surface of the plate-like optical member 11 in the normal direction of the surface. These engaging projections 111 are preferably formed in the vicinity of the outer periphery of the plate-like optical member 11 and at the approximate center of a predetermined side. In FIG. 1, the structure formed in each one of the four sides of the plate-shaped optical member 11 is shown. However, the present invention is not limited to this configuration. For example, the structure formed in one side, two sides, or three sides of four sides may be sufficient. The point is that the engaging projections may be formed at positions that do not overlap the display area of the display panel (for example, outside the display area) in a state where the plate-like optical member 11 is assembled to the display device.

  In addition, as shown in FIG. 1, these engagement protrusions 111 are preferably formed at a substantially center of a predetermined side of the plate-like optical member 11. However, the present invention is not limited to this configuration. For example, a configuration in which a plurality of engaging protrusions 111 are formed at substantially equal intervals on a predetermined side of the plate-like optical member 11 may be employed. Moreover, the structure formed in the four corner vicinity of the plate-shaped optical member 11 may be sufficient. Furthermore, the structure formed in the approximate center of the predetermined | prescribed edge | side of the plate-shaped optical member 11, and four corner vicinity may be sufficient. Thus, the number of the engagement protrusions 111 is not limited.

  These engaging projections 111 are preferably formed so as to be integrally formed at the same time when the plate-like optical member 11 is injection-molded. In addition, the structure in which the engagement protrusion 111 made of another member is bonded or welded to a predetermined position of the plate-like optical member 11 may be employed. The point is that the engaging projection 111 may be integrated with the plate-like optical member 11 when the plate-like optical member 11 becomes the final product.

  Of the optical members 11 and 12 according to the embodiment of the present invention, as the sheet-like or film-like optical member 12, a diffusion sheet, a lens sheet, a polarization reflection sheet, or the like can be applied. In short, it is an optical member formed in a sheet shape or a film shape, and any member can be used as long as it adjusts the characteristics of transmitted light.

  The sheet-like or film-like optical member 12 is formed with an engagement hole 121 through which the engagement protrusion 111 formed on the plate-like optical member 11 can be inserted freely. The engagement hole 121 is formed at a position corresponding to the engagement protrusion 111 formed on the plate-like optical member 11 in a state where the sheet-like or film-like optical member 12 is superimposed on the plate-like optical member 11. Is done. In FIG. 1, the structure by which the engagement hole 121 is formed in the approximate center of the four sides of the sheet-like or film-like optical member 12 is shown. When the sheet-like or film-like optical member 12 is superimposed on the plate-like optical member 11, the engagement protrusion 111 formed on the plate-like optical member 11 and the sheet-like or film-like optical member 12 are formed. The formed engagement hole 121 is engaged. Therefore, the sheet-like or film-like optical member 12 can be held in a positioned state on the surface of the plate-like optical member 11.

  Here, the diffusion sheet, the lens sheet, and the polarization reflection sheet will be briefly described. The diffusion sheet is an optical member that can achieve uniform luminance distribution in the surface direction by randomly diffusing transmitted light. This diffusion sheet is a sheet or film formed by mixing fine particles having the property of irregularly reflecting light on a substantially transparent substrate. As the substantially transparent substrate, PET (polyethylene terephthalate) or the like can be applied.

  The lens sheet has a laminated structure of a base layer and a layer having a predetermined cross-sectional shape and a light collecting function. PET (polyethylene terephthalate) or the like can be applied to the base layer, and acrylic resin or the like can be applied to the layer having a light collecting function. This lens sheet has a function of concentrating transmitted light and improving luminance.

  A polarization reflection sheet (also referred to as a brightness enhancement sheet) is an optical member that transmits polarized light in a predetermined direction (light that vibrates in a predetermined direction) and reflects other polarized light. The DBEF series (“DBEF” is a registered trademark of 3M Company) is suitable for the polarizing reflection sheet.

  Then, as shown in FIG. 1, a predetermined sheet-like or film-like optical member 12 is stacked on the surface of the plate-like optical member 11 (the surface on the side where the engagement protrusion 111 is formed). Is done. At this time, the engagement protrusion 111 formed on the plate-like optical member 11 and the engagement hole 121 formed on the sheet-like or film-like optical member 12 are engaged (the engagement protrusion 111 is engaged). Through the hole 121). Thereby, the sheet-like or film-like optical member 12 is supported in a positioned state on the surface of the plate-like optical member 11 (that is, the sheet-like or film-like optical member 12 is a plate-like optical member. Positioned relative to member 11). Therefore, the positional deviation of the sheet-like or film-like optical member 12 can be prevented or suppressed, and the generation of wrinkles and deflection due to the positional deviation can be prevented or suppressed.

  If the plate-like optical member 11 and the sheet-like or film-like optical member 12 are configured to be engaged by the engagement protrusions 111 and the engagement holes 121 formed at the approximate centers of the respective sides, When the plate-like optical member 11 and the sheet-like or film-like optical member 12 are thermally deformed (particularly expanded), they can be deformed from the center of each side toward both sides. Therefore, even when it is thermally deformed, it is possible to prevent or suppress the occurrence of wrinkling or bending in the sheet-like or film-like optical member 12.

  Further, since it is not necessary to form positioning pieces or protrusions that protrude outward in the surface direction on the sheet-like or film-like optical member 12, when cutting out from a large-area or long original product, the outer dimensions of the cut-out There is no need to increase the size. Therefore, since there is no wasted part in the original product, an increase in the cost of the sheet-like or film-like optical member 12 can be suppressed. These (the plate-like optical member 11 and the sheet-like or film-like optical member 12) are made of a resin material, and the sheet-like or film-like optical sheet 12 is positioned on the metal chassis 21. In comparison, it is less susceptible to thermal deformation.

  Next, the light source device 2 including the optical members 11 and 12 according to the embodiment of the present invention will be described. FIG. 2 is an exploded perspective view schematically showing the configuration of the light source device 2 including the optical members 11 and 12 according to the embodiment of the present invention (that is, the light source device 2 according to the embodiment of the present invention). For convenience of explanation, the upper side in FIG. 2 is referred to as the front side of the light source device 2 according to the embodiment of the present invention, and the lower side is referred to as the back side.

  The light source device 2 according to the embodiment of the present invention includes a chassis 21, a reflection sheet 22, a light source 23, a lamp clip 24, a side holder 25, the optical members 11 and 12 according to the embodiment of the present invention, and a frame. 26, a light source drive circuit board 27, and a light source drive circuit board cover 28.

  The chassis 21 (sometimes referred to as a backlight chassis) is a substantially flat member. Side walls 211 are formed on both long sides of the chassis 21 so as to stand toward the front side and face each other. A stepped surface 212 for mounting the optical members 11 and 12 according to the embodiment of the present invention is formed at the front end of the side wall 211 (the front side of the chassis 21). For example, a configuration in which the chassis 21 is formed by pressing a metal plate material is applied.

  The reflection sheet 22 is a sheet-like, film-like or plate-like member having a surface property that diffusely reflects light. The reflection sheet 22 is formed of, for example, sheet-like, film-like, or plate-like foamed PET (polyethylene terephthalate).

  The light source 23 is a member that can emit light of a predetermined wavelength. For the light source 23, various conventionally known light sources such as various fluorescent tubes such as cold cathode tubes and hot cathode tubes, discharge tubes such as xenon tubes, and LEDs (light emitting diodes) can be applied. The light source device 2 shown in FIG. 2 has a configuration in which a linear fluorescent tube is applied as the light source 23, but the present invention is not limited to this configuration.

  The lamp clip 24 is a member that holds the light source 23 and also functions as a spacer of the optical members 11 and 12 according to the embodiment of the present invention.

  The optical members 11 and 12 according to the embodiment of the present invention are members that adjust the characteristics of light emitted from the light source 23. Details are as described above.

  The side holder 25 covers both ends (near the electrodes) of the light source 23 and functions as a spacer for mounting the optical members 11 and 12 according to the embodiment of the present invention. The side holder 25 is a substantially rod-shaped member, and is integrally formed of, for example, a synthetic resin material. A mounting surface 251 on which the optical members 11 and 12 according to the embodiment of the present invention can be mounted is formed on the front side of the side holder 25.

  The frame 26 is a member that supports and / or protects a display panel described later. As shown in FIG. 2, the frame 26 is a frame-shaped member having a substantially quadrangular opening. The frame 26 has a structure formed integrally with a synthetic resin, a structure in which parts formed from a synthetic resin or the like are combined, a structure formed integrally by pressing such as a metal plate, a metal plate, etc. A configuration in which parts made of the above are combined can be applied.

  The light source driving circuit board 27 is a board on which an electronic circuit and / or an electric circuit for driving the light source 23 is constructed. When a fluorescent tube is used as the light source 23, an inverter circuit or the like is constructed. The light source drive circuit board cover 28 is a plate-like member that covers the light source drive circuit board 27 or a shallow tray-like member. The light source drive circuit board cover 28 protects the light source drive circuit board 27 and prevents unnecessary radiation from the light source drive circuit board 27. For this reason, the light source drive circuit board cover 28 is formed of a conductor such as metal.

  The assembly structure of the light source device 2 provided with such a member is as follows.

  This will be described with reference to FIG. A reflection sheet 22 is disposed on the front side of the chassis 21. Further, a plurality of light sources 23 are arranged side by side on the front side. These light sources 23 are held on the front side of the bottom surface of the chassis 21 by a lamp clip 24 or the like. A side holder 25 is disposed on the short side of the chassis 21 so as to cover both ends of the light source 23.

  Predetermined optical members 11 and 12 are placed on the step surface 212 on the side wall of the chassis 21 and the placement surface 251 of the side holder 25. Specifically, first, a plate-like optical member 11 (specifically, for example, a diffusion plate) is placed, and a predetermined sheet-like or film-like optical member 12 is placed on the front side thereof. At this time, the engagement protrusion 111 formed on the plate-like optical member 11 and the engagement hole 121 formed on the sheet-like or film-like optical member 12 are engaged. Thereby, the sheet-like or film-like optical member 12 is positioned and held on the front side of the plate-like optical member 11.

  A specific combination of the plate-like optical member 11 and the sheet-like or film-like optical member 12 is, for example, as follows. (1) A plate-like optical member 11 is provided with a diffusion plate, and a sheet-like or film-like optical member 12 is provided with a diffusion sheet, a lens sheet, and a polarization reflection sheet. Then, a diffusion plate, a diffusion sheet, a lens sheet, and a polarization reflection sheet are stacked in order from the back. (2) A diffusing plate is provided as the plate-like optical member 11, and a polarizing reflection sheet and two diffusing sheets are provided as the sheet-like or film-like optical member 12. Then, a diffusion plate, two diffusion sheets, and a polarizing reflection sheet are stacked in order from the back. (3) A plate-like optical member 11 is provided with a diffusion plate, and a sheet-like or film-like optical member 12 is provided with a lens sheet and two diffusion sheets. And a diffusion plate, a diffusion sheet, a lens sheet, and a diffusion sheet are stacked in order from the back. (4) A diffusing plate is provided as the plate-like optical member 11, and one, two, or three diffusing sheets are provided as the sheet-like or film-like optical member 12. Then, a diffusion plate and a predetermined number (one, two, or three) of diffusion sheets are stacked in order from the back. The combination of the plate-like optical member 11 and the sheet-like or film-like optical member 12 is not limited to these combinations. What is necessary is just to select suitably according to the kind etc. of the light source device 2 or a display apparatus.

  The frame 26 is attached to the chassis 21 from the front side. A light source drive circuit board 27 is disposed on the rear surface of the chassis 21, and a light source drive circuit board cover 28 is disposed so as to cover the light source drive circuit board 27.

  According to such a configuration, the sheet-like or film-like optical member 12 is positioned and supported by the plate-like optical member 11 (diffusion plate). Therefore, it is possible to prevent or suppress the occurrence of wrinkles and deflection due to the positional deviation of the sheet-like or film-like optical member 12.

  Next, the display device 3 including the light source device according to the embodiment of the present invention (that is, the display device 3 according to the embodiment of the present invention) will be described. FIG. 3 is an exploded perspective view schematically showing the configuration of the display device 3 according to the embodiment of the present invention.

  As shown in FIG. 3, the display device 3 according to the embodiment of the present invention includes a light source device 2, a display panel 31, a bezel 32, a control circuit board 33, and a control circuit board cover according to the embodiment of the present invention. 34.

  As the display panel 31, conventionally known various transmissive display panels can be applied. For example, a transmissive active matrix type liquid crystal display panel can be suitably applied. The bezel 32 is a member having a function of supporting and / or protecting the display panel 31. As shown in FIG. 3, the bezel 32 has a substantially quadrangular shape with an opening. The control circuit board 33 is a circuit board on which an electronic circuit and / or an electric circuit that generates a control signal for driving the display panel 31 is constructed based on a signal input from the outside. The control circuit board cover 34 is a member that covers the control circuit board 33.

  The assembly structure of the display device 3 according to the embodiment of the present invention is as follows. A display panel 31 is disposed on the front side of the frame 26 of the light source device 2 according to the embodiment of the present invention. And the bezel 32 is mounted | worn from the front side. Thereby, the display panel 31 is held between the frame 26 and the bezel 32 of the light source device 2 according to the embodiment of the present invention. In addition, a control circuit board 33 is disposed on the back side of the chassis 21 of the light source device 2 according to the embodiment of the present invention. A control circuit board cover 34 is disposed so as to cover the control circuit board 33.

  According to such a display device 3, when light emitted from the light source device 2 according to the embodiment of the present invention is transmitted through the display panel 31, an image is displayed in a visible state on the front side of the display panel 31. As described above, the sheet-like or film-like optical member 12 is positioned and supported by the plate-like optical member 11, and the occurrence of wrinkles and deflection is prevented or suppressed. Therefore, the embodiment of the present invention is applied. The display device 3 can perform high-quality image display without luminance unevenness and shadow.

  Next, a television receiver including a display device according to an embodiment of the present invention will be briefly described. FIG. 4 is an exploded perspective view schematically showing an example of the configuration of the television receiver 6 including the display device according to the embodiment of the present invention. The television receiver 6 includes a tuner 63, a display device 3, a loudspeaker 64, a power source 62, cabinets 611 and 612, and a support member 65.

  The tuner 63 generates an image signal and an audio signal of a predetermined channel based on the received radio wave or an externally input signal. As this tuner 63, a conventional general terrestrial (analog terrestrial and / or digital terrestrial) tuner, BS tuner, CS tuner, or the like is applied.

  The display device 3 displays an image based on the image signal generated by the tuner 63. The display device 3 according to the embodiment of the present invention can be applied to the display device 3. The loudspeaker 64 emits sound based on the sound signal generated by the tuner 63. As the loudspeaker 64, various publicly known loudspeakers such as a conventional general speaker can be applied. The power source 62 supplies power to the tuner 63, the display device 3, the loudspeaker 64, and the like.

  The tuner 63, the display device 3, the loudspeaker 64, and the power source 62 are housed in a cabinet (the cabinet shown in FIG. 4 is composed of a front-side cabinet 611 and a back-side cabinet 612) and supported by a support member 65. Is done. The configuration is not limited to such a configuration, and for example, a configuration in which the tuner 63, the loudspeaker 64, and the power source 62 are assembled to the display device 3 may be used.

  As mentioned above, although various embodiment of this invention was described in detail, this invention is not limited to the said various embodiment at all, and various modification | change is possible in the range which does not deviate from the meaning of this invention.

It is the figure which showed typically the structure of the optical member applied to the light source device concerning embodiment of this invention. It is the disassembled perspective view which showed typically the structure of the light source device concerning embodiment of this invention. It is the disassembled perspective view which showed typically the structure of a display apparatus (display apparatus concerning embodiment of this invention) 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 provided with the display apparatus concerning embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Plate-shaped optical member 111 Engagement protrusion 12 Sheet-like or film-like optical member 121 Engagement hole 2 Light source device 21 Chassis 211 Side wall 212 Step surface 22 Reflective sheet 23 Light source 24 Lamp clip 25 Side holder 251 Mounting surface 26 Frame 27 Light source drive circuit board 28 Light source drive circuit board cover 3 Display device 31 Display panel 32 Bezel 33 Control circuit board 34 Control circuit board cover 6 Television receiver 611, 612 Cabinet 62 Power supply 63 Tuner 64 Loudspeaker 65 Support member

Claims (4)

  A light source device having a sheet-like optical member for adjusting the characteristic of transmitted light and a plate-like optical member for adjusting the characteristic of transmitted light, wherein the sheet-like optical member is formed in a substantially quadrilateral shape. A through-hole-like engagement hole is formed in the vicinity of the outer peripheral edge of at least one side of the four sides, and the plate-like optical member is formed in a substantially quadrangular shape and protrudes in the vicinity of the outer peripheral edge of at least one of the four sides. A light source device characterized in that an engagement protrusion formed in the shape of a sheet is formed, and an engagement hole formed in the sheet-shaped optical member engages with an engagement protrusion formed in the plate-shaped optical member.   An engagement hole formed on at least one side of the four sides of the sheet-like optical member is formed at substantially the center of the one side, and an engagement protrusion formed on at least one of the four sides of the plate-like optical member. The light source device according to claim 1, wherein the light source device is formed at substantially the center of the one side.     3. The sheet-like optical member is at least one of a polarization reflection sheet, a lens sheet, and a diffusion sheet, and the plate-like optical member is a diffusion plate. The light source device described.   A display device comprising: the light source device according to any one of claims 1 to 3; and a liquid crystal display panel.

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