JP2011048125A - Display device - Google Patents

Abstract

Provided is a display device capable of suppressing complication of an assembling operation and preventing distortion of an optical sheet at the time of assembling and suppressing occurrence of luminance unevenness.
A display device includes a liquid crystal panel that displays various types of information, a light source unit that is disposed on the back side of the liquid crystal panel and irradiates the liquid crystal panel, and the liquid crystal panel and the light source unit. 11 and a lens sheet 17 that focuses the light on the front side of the liquid crystal panel 10, and a case 20 that accommodates the liquid crystal panel 10, the lens sheet 17, and the light source unit 11 in a stacked state inside. It has. The lens sheet 17 is provided with a convex portion 18 protruding outward from the outer edge portion. The case 20 has a peripheral wall 23 that positions the light source unit 10 and the lens sheet 17 at a desired stacking position, and a protrusion 18 is inserted in the peripheral wall 23 to restrict the movement of the lens sheet 17 toward the liquid crystal panel 10. And an insertion portion 25 to be provided.
[Selection] Figure 5

Description

  The present invention includes a liquid crystal display element that displays predetermined information, a light source unit disposed on the back side of the liquid crystal display element, and an optical sheet disposed between the liquid crystal display element and the light source unit. The present invention relates to a display device.

  In display devices used for televisions, various computers, portable information terminals, car navigation systems, and the like, for example, liquid crystal display devices that can be reduced in weight, thickness, power consumption, and the like (see, for example, Patent Document 1). ) Has been proposed.

  A liquid crystal display device disclosed in Patent Document 1 is a liquid crystal panel in which liquid crystal is sealed between a pair of transparent substrates, and a light source unit that is disposed on the back side of the liquid crystal panel and irradiates the liquid crystal panel with light. A surface light source, an optical sheet that is disposed between the liquid crystal panel and the surface light source and focuses light from the surface light source in the front direction of the liquid crystal panel, and the liquid crystal panel, the optical sheet, and the surface light source are stacked on each other And a bezel as a cover provided with an exposed portion attached to the frame and exposing the display surface of the liquid crystal panel.

  The surface light source is a rectangular light guide plate made of a translucent material, a rod-shaped light source provided along one side surface of the light guide plate, a reflection sheet stacked on the back side of the light guide plate, It has. The frame includes a lower frame that accommodates the optical sheet and the surface light source stacked on each other inside, and an upper frame that is attached to the lower frame and covers the outer edge of the optical sheet and accommodates the light source panel on the inner side. ing.

  The liquid crystal display device configured as described above first accommodates the surface light source in the lower frame, and overlaps the optical sheet on the surface of the surface light source while abutting the outer edge of the optical sheet against the inner peripheral surface of the lower frame. The optical sheet and the surface light source are accommodated in the lower frame in a stacked state. Then, the upper frame is attached to the lower frame so as to cover the outer edge of the optical sheet, and the upper and lower frames are fixed to each other by screwing so that the liquid crystal panel is accommodated in the upper frame of the frame after the frame is assembled. To do. Finally, the bezel is attached to the frame with the display surface of the liquid crystal panel exposed. Thus, the liquid crystal display device is assembled.

JP 2003-222862 A

  However, in the liquid crystal display device disclosed in Patent Document 1 described above, the optical sheet is accommodated in the lower frame so as to overlap the surface of the surface light source while abutting the outer edge portion against the inner peripheral surface of the lower frame. The workability when housing the optical sheet in the lower frame was poor. Further, since the optical sheet is positioned in the lower frame by abutting the outer edge portion against the inner peripheral surface of the lower frame, the outer edge portion of the optical sheet is lifted, and the optical sheet is distorted, There is a possibility that luminance unevenness occurs in the liquid crystal panel. Further, after assembling the frame by fixing the upper frame to the lower frame by screw tightening, the liquid crystal panel is accommodated in the upper frame and the bezel is attached to the frame.

  As described above, in the liquid crystal display device disclosed in Patent Document 1 described above, there is a problem in that the optical sheet is distorted when assembled, luminance unevenness occurs in the liquid crystal panel, and the assembling work becomes complicated.

  Therefore, in view of the above-described problems, the present invention provides a display device capable of suppressing the complexity of the assembly work and preventing the optical sheet from being distorted during the assembly, thereby suppressing the occurrence of luminance unevenness in the liquid crystal display element. The challenge is to do.

  In order to solve the above-mentioned problem, the invention described in claim 1 is a liquid crystal display element that displays various types of information, a light source unit disposed on a back side of the liquid crystal display element, the liquid crystal display element, A display device comprising: an optical sheet disposed between the light source unit; and a case that accommodates the liquid crystal display element, the optical sheet, and the light source unit in a state of being stacked on each other. The sheet includes a convex portion protruding outward from an outer edge portion, and the case is provided on the peripheral wall for positioning the light source unit and the optical sheet at a desired stacking position, and the convex portion is inserted in the peripheral wall. And an insertion portion for restricting movement of the optical sheet to the liquid crystal display element side.

  The invention described in claim 2 is the invention according to claim 1, comprising a plurality of the optical sheets, and each of the plurality of optical sheets faces outward from a position different from the convex portion of the outer edge portion. When the plurality of optical sheets are stacked, the second convex portions are arranged so as not to overlap each other when the plurality of optical sheets are stacked, and when the peripheral wall of the case houses the plurality of optical sheets in the case And a plurality of engaging recesses that engage with the second protrusions of the plurality of optical sheets, respectively.

  According to the first aspect of the present invention, the optical sheet includes the convex portion protruding outward from the outer edge portion, and the case has a peripheral wall that positions the light source unit and the optical sheet at a desired stacking position, and Since the convex portion of the optical sheet is provided and the convex portion of the optical sheet is inserted to restrict the movement of the optical sheet to the liquid crystal display element side, the convex portion of the optical sheet is provided on the peripheral wall of the case. It is possible to prevent the optical sheet in the case from being detached simply by inserting the optical sheet into the case by inserting it into the insertion portion. For this reason, it can prevent that a distortion arises in the optical sheet accommodated in the case, without increasing an assembly man-hour.

  According to the invention described in claim 2, the plurality of optical sheets protrude from the position different from the convex portion of the outer edge portion toward the outside, and do not overlap each other when the plurality of optical sheets are stacked. And a plurality of engagements that engage with each of the second protrusions of the plurality of optical sheets when the plurality of optical sheets are accommodated in the case. Since the joint recess is provided, it is possible to easily confirm whether or not the plurality of optical sheets are accommodated in the case in the correct orientation by the second convex portions of the plurality of optical sheets. For this reason, erroneous assembly of a plurality of optical sheets can be prevented.

  As described above, according to the first aspect of the present invention, the optical sheet in the case can be obtained simply by inserting the convex portion of the optical sheet into the insertion portion provided on the peripheral wall of the case and accommodating the optical sheet in the case. The sheet can be prevented from coming off, and the bezel can be assembled from above to prevent the sheet from lifting, preventing the optical sheet contained in the case from being distorted without increasing the number of assembly steps. can do. For this reason, while complicating the assembly work, it is possible to prevent distortion of the optical sheet at the time of assembly, and to suppress occurrence of luminance unevenness in the liquid crystal display element.

  In the second aspect of the invention, the second convex portions of each of the plurality of optical sheets can easily confirm whether or not the plurality of optical sheets are accommodated in the case in the correct orientation. Incorrect assembly of a plurality of optical sheets can be prevented. For this reason, generation | occurrence | production of the assembly | attachment defect of an optical sheet can be prevented, and the improvement of assembly | attachment property can be aimed at.

It is a top view which shows the front of the combination meter for vehicles provided with the display apparatus of this invention. It is sectional drawing which follows the II-II line | wire in FIG. It is a disassembled perspective view which shows schematic structure of the display apparatus shown by FIG. It is a principal part enlarged view for demonstrating the relationship between the case of the display apparatus shown by FIG. 3, and the convex part of an optical sheet. It is principal part sectional drawing for demonstrating the relationship between the case of the display apparatus shown by FIG. 3, and the convex part of an optical sheet. It is a principal part enlarged view for demonstrating the relationship between the case of the display apparatus shown by FIG. 3, and the 2nd convex part of an optical sheet.

  Hereinafter, a display device according to an embodiment of the present invention will be described with reference to FIGS. A display device 1 according to an embodiment of the present invention is used in, for example, a known vehicle instrument device 2 mounted on a vehicle such as an automobile. This vehicular instrument device 2 is a device that displays the state of the vehicle to a vehicle occupant.

  As shown in FIG. 1 or 2, the vehicle instrument device 2 includes a speedometer 3 that displays the speed of the vehicle as a pointer-type display instrument, a display device 1 that displays various information indicating the status of the vehicle, A printed wiring board 4 on which various electronic components and the like are mounted, an instrument case 5 that accommodates the speedometer 3, the display device 1, the printed wiring board, and the like, and an occupant side of the instrument case 5, that is, the front side. The facing member 6 and the transparent cover 7 covering the passenger side of the facing member 6, that is, the front side, are provided.

  In the present embodiment, in order to simplify the description, only the speedometer 3 that is a pointer-type display instrument that indicates the speed of the vehicle is provided. However, a tachometer that indicates the engine speed of the vehicle is also included. Of course, it may be configured to include a pointer-type instrument such as a water temperature meter indicating the engine coolant temperature and a fuel meter indicating the remaining fuel amount.

  As shown in FIG. 1 or FIG. 2, the speedometer 3 has a dial 30 provided with a scale for displaying vehicle speed and an index portion 31 such as numerals, characters or symbols on the surface (surface on the viewer side), A pointer 32 disposed on the viewer side of the dial plate 30, a movement 35 to which the pointer 32 is attached, and a decorative ring 37 disposed on the outer periphery of the indicator portion 31 of the dial plate 30 are provided.

  The dial 30 is made of translucent synthetic resin or the like and is formed in a disc shape. The dial 30 is provided with a light shielding layer on the surface, and the indicator portion 31 is formed by removing the indicator portion 31 of the light shielding layer. In the dial plate 30, the indicator portion 31 is arranged in a substantially arc shape corresponding to the allowable rotation range of the pointer 32, and the indicator portion 31 transmits light from behind to the front (occupant side). Light emission is visually recognized by a vehicle occupant (user).

  The pointer 32 is made of a light-transmitting material such as acrylic resin, and extends to the base end portion 33 serving as a central axis and linearly extends from the base end portion 33 and points to the index portion 31 described above. And an instruction unit 34. The pointer 32 is attached to an output shaft 36 (described later) of the movement 35 in a state where the base end portion 33 is located at the center of the indicator portion 31 and rotates integrally with the output shaft 36.

  The pointer 32 having the above-described configuration is rotated by the movement 35 in accordance with a measurement amount measured by a vehicle speed measurement unit (not shown), and displays the measurement amount in cooperation with the indicator portion 31 provided on the dial 30. To do. In addition, the pointer 32 reflects light incident on the base end portion 33 from the LED 38 (described later) of the printed wiring board 4 toward the distal end of the indication portion 34 when the pointer 32 is dark, such as at night. The indicator 34 shines.

  As shown in FIG. 2, the movement 35 is attached to the side away from the viewer of the printed wiring board 4, that is, the rear side, and is housed in the instrument case 5. Connected with the means. The movement 35 includes an output shaft 36 that rotates in accordance with a measurement amount measured by the vehicle speed measurement means.

  The decorative ring 37 is formed in a ring shape in plan view, and is attached to the surface of the dial 30 (a surface visually recognized by the occupant). It is provided so as to border the periphery.

  As shown in FIG. 1 or FIG. 2, the display device 1 is disposed on the vehicle occupant side of the pointer 32 so as to cover the proximal end portion 33 of the pointer 32, that is, to cover the rotation center of the pointer 32. ing. And the display apparatus 1 displays the various information which shows the states of vehicles, such as a shift position, a travel distance, average speed, and fuel remaining amount. The detailed configuration of the display device 1 will be described later.

  The printed wiring board 4 is made of a relatively hard material having no flexibility, and is formed in a substantially rectangular flat plate shape. The printed wiring board 4 includes a plurality of LEDs 38 that illuminate the indicator portion 31 and the pointer 32 described above, a movement 35 described above, the plurality of LEDs 38 and the movement 35, and a liquid crystal panel 10 and a backlight described later of the display device 1. Electronic components such as a control unit for controlling the operation of the unit 11 and the like are electrically connected and mounted. The printed wiring board 4 is arranged substantially in parallel with a front wall 41 of a case body 40 (to be described later) of the instrument case 5 and a bottom wall 46 of the back cover 45, and is attached between the case body 40 and the back cover 45. And accommodated in the instrument case 5.

  The instrument case 5 is formed of a synthetic resin or the like, and includes a case main body 40 and a back cover 45 as shown in FIG. The case main body 40 includes a front wall 41 facing the vehicle occupant and a peripheral wall 42 extending from the outer peripheral edge of the front wall 41 in a direction away from the vehicle occupant. The case main body 40 is formed in a box shape that opens to the side away from the occupant, that is, the back side.

  The front wall 41 is provided with a plurality of openings 43 through which the output shaft 36 of the movement 35 described above passes and light from the plurality of LEDs 38 of the printed wiring board 4 to the dial 30 and the pointer 32 side. Yes. The peripheral wall 42 forms an outline of the case body 40. The case body 40 has a dial 30 on the surface of the front wall 41 on the occupant side of the vehicle, and a decorative ring 37 is attached so as to sandwich the dial 30 with the front wall 41.

  As shown in FIG. 2, the back cover 45 includes a bottom wall 46 and a peripheral wall 47 erected from the outer peripheral edge of the bottom wall 46 and extending toward the vehicle occupant side. It is formed in the shape of a case that is open. The back cover 45 is attached to the side of the case body 40 away from the viewer, that is, the back side, and closes the opening of the case body 40.

  The facing member 6 is made of synthetic resin or the like, and has openings in portions corresponding to the speedometer 3 and the display device 1 as shown in FIG. The turning member 6 is attached to the vehicle occupant side of the case body 40 of the instrument case 5, that is, the front side, and shields the speedometer 3 and the display device 1 other than the display portion from the vehicle occupant.

  The transparent cover 7 is made of a transparent resin or the like and is formed in a flat plate shape. The transparent cover 7 is attached to the case body 40 in such a manner that the facing member 6 is sandwiched between the transparent case 7 and the front wall 41 of the case body 40 of the instrument case 5. The transparent cover 7 covers the occupant side, that is, the front side of the vehicle such as the speedometer 3, the display device 1, and the look-back member 6, and prevents dust and the like from entering the vehicle instrument device 2.

  As shown in FIG. 3, the display device 1 includes a liquid crystal panel 10 as a liquid crystal display element, and a light source unit 11 that is disposed on the back side away from the vehicle occupant of the liquid crystal panel 10 and illuminates the liquid crystal panel 10. A plurality of lens sheets 17 as optical sheets disposed between the liquid crystal panel 10 and the light source unit 11, and a case 20 that accommodates the liquid crystal panel 10, the plurality of lens sheets 17, and the light source unit 11 in a stacked state. And.

  As the liquid crystal panel 10, a well-known LCD (liquid crystal display) capable of transmitting light from the back side is used. The liquid crystal panel 10 is provided with a connection cable 10b led out from the inside of the liquid crystal panel 10 to the outside. As the connection cable 10b, a well-known thin FFC (flexible flat cable), FPC (flexible printed circuit), or the like is used. One end of the connection cable 10b is electrically connected to the liquid crystal panel 10, and the other end is electrically connected to the control unit (not shown) of the printed wiring board 4 described above.

  The liquid crystal panel 10 having the configuration described above is electrically connected to a control unit (not shown) provided on the printed wiring board 4 described above via a connection cable 10b. The liquid crystal panel 10 displays various types of information indicating the vehicle state such as the shift position, the travel distance, the average speed, and the fuel remaining amount on the display surface 10a under the control of the control unit.

  In the present embodiment, an LCD (Liquid Crystal Display) is used as the liquid crystal panel 10. However, for example, a TFT liquid crystal (thin film transistor), a DSTN (Dual-scan Super Twisted Nematic) liquid crystal, or the like may be used. A self-luminous device such as (VFD) can be used.

  The light source unit 11 is disposed so as to face the back side of the liquid crystal panel 10 away from the vehicle occupant, the light source substrate 13 on which the light source 14 for illuminating the liquid crystal panel 10 is mounted, and the light source 14. The light guide plate 12 that guides the light from the light guide plate 12 to the liquid crystal panel 10, and the reflection sheet 16 disposed on the back side of the light guide plate 12 away from the vehicle occupant.

  The light source substrate 13 is made of a relatively hard material that does not have flexibility, and is formed in a substantially rectangular flat plate shape. When the light source substrate 13 is housed in a substrate housing portion 24 of a holder 21 described later of the case 20, a light source 14 such as an LED or a bulb and a connector are provided on a surface of the light guide plate 12 that faces a light receiving portion 12 a described later. 15 are provided. The light source substrate 13 is electrically connected to the above-described printed wiring board 4 by the wire 15a connected to the connector 15 and the wire 15a. As the electric wire 15a, a well-known thin FFC (flexible flat cable), FPC (flexible printed circuit), or the like is used.

  The light guide plate 12 is made of a synthetic resin having translucency, is formed in a flat plate shape, and a light receiving portion 12a that receives light from the light source 14 is provided on a part of the outer periphery. The light guide plate 12 is disposed on the back side of the liquid crystal panel 10 away from the vehicle occupant and is accommodated in a holder 21 described later of the case 20 so as to be interposed between the liquid crystal panel 10 and the light source 14. The light guide plate 12 emits light from the light source 14 received by the light receiving unit 12a toward the liquid crystal panel 10.

  The reflection sheet 16 is made of a synthetic resin or the like and is formed in a thin film shape. The reflection sheet 16 is disposed on the back side of the light guide plate 12 away from the vehicle occupant, and is laminated with the light guide plate 12 and accommodated in a holder 21 described later of the case 20. The reflection sheet 16 reflects the light from the light source 14 that has passed through the light guide plate 12 toward the light guide plate 12.

  The light source unit 11 having the above-described configuration is turned on under the control of the control unit described above when the liquid crystal panel 10 performs display, so that light for transmitting the liquid crystal panel 10, that is, for causing the liquid crystal panel 10 to emit light. Emits the light.

  The plurality of lens sheets 17 are made of a transparent synthetic resin or the like and are formed in a thin film shape. The plurality of lens sheets 17 have an outer shape that is substantially equal to that of the liquid crystal panel 10 described above. Each of the plurality of lens sheets 17 includes a rectangular convex portion 18 protruding outward from the outer edge portion, and a rectangular second convex portion protruding outward from the outer edge portion at a position different from the convex portion 18. 19. The convex portions 18 of the plurality of lens sheets 17 are arranged so as to overlap each other when the plurality of lens sheets 17 are stacked. Each 2nd convex part 19 of the some lens sheet 17 is arrange | positioned so that it may not mutually overlap when the said some lens sheet 17 is piled up.

  The plurality of lens sheets 17 are disposed between the liquid crystal panel 10 and the light guide plate 12 of the light source unit 11 and are accommodated in a holder 21 described later of the case 20 in a state where the liquid crystal panel 10 and the light guide plate 12 are stacked. Then, the light from the light source 14 that has passed through the light guide plate 12 of the light source unit 11 is focused on the vehicle occupant side, that is, the front side of the liquid crystal panel 10. In the present embodiment, the plurality of lens sheets 17 are used as the plurality of optical sheets. However, for example, a plurality of optical sheets having different optical characteristics, such as a polarizing sheet and a brightness enhancement sheet, can be used.

  The case 20 is made of an insulating synthetic resin, and includes a holder 21 and a cover member 27 that covers the holder 21.

  The holder 21 includes a disc-shaped bottom wall 22 and a peripheral wall 23 that stands from the outer peripheral edge of the bottom wall 22 and extends toward the vehicle occupant side, and is formed in a case shape that opens to the vehicle occupant side. . The bottom wall 22 is provided with a substrate housing portion 24 formed through the bottom wall 22 and disposed adjacent to the peripheral wall 23. The substrate accommodating portion 24 accommodates the light source substrate 13 inside in a state where the light source 14 of the light source substrate 13 is opposed to the light receiving portion 12a of the light guide plate 12.

  The peripheral wall 23 includes an insertion portion 25 into which the projections 18 of the plurality of lens sheets 17 are inserted, and a plurality of engagement recesses 26 that engage with the projections 19 of the plurality of lens sheets 17. ing. The insertion portion 25 penetrates the peripheral wall 23 and is formed in a rectangular shape that can be inserted in a state where the convex portions 18 of the plurality of lens sheets 17 are overlapped. Each of the plurality of engaging recesses 26 is formed in a concave shape from the end portion toward the bottom wall 22 by cutting away the end portion of the peripheral wall 23 away from the bottom wall 22. The plurality of engaging recesses 26 are arranged at intervals along the peripheral wall 23.

  In addition, the peripheral wall 23 is provided with a pair of holding pieces 23 a that protrude from an end portion of the peripheral wall 23 away from the bottom wall 22. The pair of holding pieces 23 a are disposed so as to be opposed to the radial direction of the peripheral wall 23. The pair of holding pieces 23a are formed so as to be elastically deformable in directions away from each other. The pair of holding pieces 23 a hold the liquid crystal panel 10 with the liquid crystal panel 10 described above being sandwiched therebetween.

  The above-described peripheral wall 23 accommodates the reflection sheet 16 and the light guide plate 12 of the light source unit 11 and the plurality of lens sheets 17 on the inside, and guides the reflection sheet 16 to the surface of the bottom wall 22 as a stacking position. The optical plate 12 and the plurality of lens sheets 17 are positioned in a sequentially stacked state, and the liquid crystal panel 10 is held in a state where the liquid crystal panel 10 is stacked on the front side of the plurality of lens sheets 17 by a pair of holding pieces 23a. The peripheral wall 23 corresponds to the peripheral wall described in the claims.

  The cover member 27 includes a front wall 28 facing the vehicle occupant and a peripheral wall 29 extending from the outer peripheral edge of the front wall 28 in a direction away from the vehicle occupant, and is open to the side away from the occupant, that is, the back side. It is formed in a case shape. The front wall 28 is provided with an exposed portion 28a that exposes the display surface 10a of the liquid crystal panel 10 to a vehicle occupant. The peripheral wall 29 is provided so as to cover the outer periphery of the peripheral wall 23 of the holder 21 when the cover member 27 is attached to the holder 21, and forms an outline of the case 20.

  Below, the method to assemble the display apparatus 1 of the structure mentioned above is demonstrated.

  First, the reflection sheet 16 and the light guide plate 12 are sequentially stacked on the surface of the bottom wall 22 of the holder 21, the light source substrate 13 is accommodated in the substrate accommodating portion 24 of the holder 21, and the electric wire 15 a is passed through the substrate accommodating portion 24. The light source unit 11 is accommodated in the holder 21 by being led out of the holder 21.

  Next, as shown in FIG. 4, the convex portion 18 of one of the lens sheets 17 is inserted into the insertion portion 25 of the peripheral wall 23 of the holder 21, and the second convex portion 19 is inserted into the holder 21. By engaging with one engaging recess 26 b of the peripheral wall 23, this one lens sheet 17 b is accommodated in the holder 21 so as to overlap the front surface side of the light guide plate 12 of the light source unit 11.

  Then, the convex portion 18 of the other lens sheet 17 a among the plurality of lens sheets 17 is inserted into the insertion portion 25 of the peripheral wall 23 of the holder 21, and the second convex portion 19 is engaged with the other of the peripheral wall 23 of the holder 21. By engaging with the recess 26a, the other lens sheet 17a is accommodated in the holder 21 so as to overlap the front side of the one lens sheet 17b.

  At this time, the second convex portion 19 of one lens sheet 17b is engaged with one engaging concave portion 26b, and the second convex portion 19 of the other lens sheet 17a is engaged with the other engaging concave portion 26a. Thus, each of the plurality of lens sheets 17 is accommodated in the holder 21 in the correct orientation. In this way, the plurality of lens sheets 17 are accommodated in the holder 21 in a state where they are stacked on each other and laminated with the light guide plate 12 of the light source unit 11.

  Subsequently, the liquid crystal panel 10 is stacked on the front side of the other lens sheet 17 a accommodated in the holder 21, that is, the front side of the plurality of lens sheets 17, and the liquid crystal panel 10 is placed between the pair of holding pieces 23 a of the holder 21. By sandwiching, the liquid crystal panel 10 is held by the pair of holding pieces 23 a, that is, the holder 21. Then, the connection cable 10 b of the liquid crystal panel 10 is led out of the holder 21.

  Finally, the cover member 27 is attached to the holder 21. Then, the cover member 27 covers the holder 21, and the display surface 10 a of the liquid crystal panel 10 is exposed from the exposed portion 28 a of the cover member 27. Thus, the display device 1 is assembled.

  According to the present embodiment, the lens sheet 17 includes the convex portion 18 that protrudes outward from the outer edge portion, and the case 20 has the peripheral wall 23 that positions the light source unit 11 and the lens sheet 17 at a desired stacking position. An insertion portion 25 is provided on the peripheral wall 23 and the convex portion 18 of the lens sheet 17 is inserted to restrict the movement of the lens sheet 17 toward the liquid crystal panel 10.

  For this reason, the lens sheet 17 in the case 20 can be removed simply by inserting the convex portion 18 of the lens sheet 17 into the insertion portion 25 provided on the peripheral wall 23 of the case 20 and housing the lens sheet 17 in the case 20. Since this can be prevented, distortion can be prevented from occurring in the lens sheet 17 accommodated in the case 20 without increasing the number of assembly steps. Therefore, it is possible to suppress complication of the assembling work, prevent distortion of the lens sheet 17 during assembling, and suppress occurrence of luminance unevenness in the liquid crystal panel 10.

  Further, the second convex portions are arranged such that the plurality of lens sheets 17 project outward from positions different from the convex portions 18 of the outer edge portions and do not overlap each other when the plurality of lens sheets 17 are stacked. 19, and the peripheral wall 23 of the case 20 is engaged with the second convex portions 19 of the plurality of lens sheets 17 when the plurality of lens sheets 17 are accommodated in the case 20. A mating recess 26 is provided.

  For this reason, it is possible to easily confirm whether or not the plurality of lens sheets 17 are accommodated in the case 20 in the correct orientation by the second convex portions 19 of the plurality of lens sheets 17, respectively. Incorrect assembly of the lens sheet 17 can be prevented. Accordingly, it is possible to prevent the lens sheet 17 from being assembled and to improve the assemblability.

  In the embodiment described above, the light source unit 11 for illuminating the liquid crystal panel 10 is arranged such that the light source 14 mounted on the light source substrate 13 faces the light receiving unit 12 a provided on a part of the outer periphery of the light guide plate 12. The sidelight system is used. However, in the present invention, the light source unit may employ a direct type system in which a diffusion plate is arranged on the back side of the liquid crystal panel 10 and a plurality of cold cathode tubes are arranged on the back side of the diffusion plate. good.

  Further, the above-described embodiments are merely representative forms of the present invention, and the present invention is not limited to the embodiments. That is, various modifications can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Display apparatus 2 Instrument apparatus 10 Liquid crystal panel (liquid crystal display element)
11 Light source unit 17 Lens sheet (optical sheet)
18 convex portion 19 second convex portion 20 case 23 peripheral wall 25 insertion portion 26 engaging concave portion

Claims (2)

A liquid crystal display element for displaying various types of information, a light source unit disposed on the back side of the liquid crystal display element, an optical sheet disposed between the liquid crystal display element and the light source unit, and the liquid crystal display on the inside A case in which an element, the optical sheet, and the light source unit are housed in a stacked state, and a display device comprising:
The optical sheet includes a convex portion protruding outward from an outer edge portion,
The case restricts the movement of the optical sheet to the liquid crystal display element side by providing the peripheral wall for positioning the light source unit and the optical sheet at a desired stacking position, and being provided on the peripheral wall and the convex portion being inserted. And a display unit. A plurality of the optical sheets are provided,
Each of the plurality of optical sheets protrudes outward from a position different from the convex portion of the outer edge portion, and is arranged so as not to overlap each other when the optical sheets are stacked. With
The peripheral wall of the case includes a plurality of engaging recesses that engage with the second protrusions of the plurality of optical sheets when the plurality of optical sheets are accommodated in the case. The display device according to claim 1.

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