JP6987462B2 - Display device - Google Patents

Description

The present invention relates to a display device having a structure in which a display unit provided with a display cell is supported by a support base, and a metal bracket covering the back of the display unit is fixed to the support base.

Patent Document 1 describes an invention relating to a display device in which a display panel is supported inside an housing portion via an elastically deformed portion.

In the display device shown in FIG. 5 of Patent Document 1, a front protective glass substrate is arranged in the opening of the housing. A display panel (PDP) and a chassis member formed of a metal plate located on the back thereof are provided inside the housing, and the display panel and the chassis member are joined via an adhesive joining member. The mounting member is fixed to the chassis member. The mounting member is slidably supported in the front-rear direction on the side housing portion, and the elastically deformed portion formed on the mounting member is connected to the front housing portion. This display device is capable of suppressing cracking of the front plate of the display panel by deforming the elastically deformed portion when it receives a drop impact during transportation or the like.

Japanese Unexamined Patent Publication No. 2009-122425

As a display device for automobiles, a display unit including a display cell such as a color liquid crystal display cell is supported by a support base, and a metal bracket covering the back of the display unit and the support base are fixed by screwing means. There is something. It is unavoidable that dimensional errors occur in the support base and the metal bracket due to dimensional tolerances and warpage. Therefore, in a structure in which the metal bracket and the support base are screwed together, the support base is distorted by the fastening force of the screwing, and this distortion is transmitted to the display unit, causing display unevenness due to the distortion on the display screen. There is a problem that it is likely to occur.

In the display device described in Patent Document 1, since the chassis member joined to the display panel is supported by the front housing portion via the elastically deformed portion, the display unit is supported by the fixing force between the chassis member and the housing portion. It is possible to suppress the distortion given to the chassis. However, the display device described in Patent Document 1 has a structure in which one end of the elastically deformed portion is fixed to the chassis member, the other end is fixed to the front housing portion, and both ends of the elastically deformed portion are fixed. Therefore, in order to be able to flexibly deform elastically between the chassis member and the housing portion, the elastically deformed portion must have a sufficiently long structure, and there is a drawback that the elastically deformed portion becomes large.

Further, the elastically deformed portion shown in FIG. 5 of Patent Document 1 is bent with an acute-angled portion in order to increase the amount of deformation. In this structure, the sharply-angled bent portion is an electromagnetic antenna. It functions in the same way as above, and may absorb electromagnetic noise and affect the display panel, the touch sensor provided on the front protective glass substrate, and the like.

The present invention solves the above-mentioned conventional problems, and can securely fix the support base supporting the display unit and the metal bracket via the connecting plate, and it is difficult for strain to be transmitted to the display unit by the fixing force. It is an object of the present invention to provide a display device having a structure and an electromagnetically stable structure.

The present invention relates to a display device having a display unit having a display cell, a support base for supporting the display unit, and a metal bracket arranged on the back of the display unit.
A connecting plate made of a metal spring material having a lower elastic modulus than the metal bracket is provided, and the connecting plate is located between the connecting fixing portion and the elastic contact portion and between the connecting fixing portion and the elastic contact portion. It has a fastening fixing part and has a fastening fixing part.
The connecting and fixing portion is fixed to the metal bracket, the elastic contact portion is elastically contacted to the metal bracket, and the fastening and fixing portion is fixed to the support base by a fastening member. be.

In the display device of the present invention, it is preferable that both the metal bracket and the connecting plate are formed of a conductive metal plate.

The display device of the present invention preferably has the fastening and fixing portion, the elastic contact portion, and the connecting and fixing portion formed side by side in a straight line.

Further, in the display device of the present invention, the connecting fixing portion is fixed to the inner surface of the metal bracket facing the display unit, and the bullet contact portion is in contact with the outer surface of the metal bracket opposite to the inner surface. Those are preferable.

In the display device of the present invention, the circuit board is sandwiched between the support base and the fastening and fixing portion, and the circuit board is fixed to the support base together with the fastening and fixing portion by screwing. Can be configured.

In the display device of the present invention, the support base on which the display unit is supported and the metal bracket are fixed via a connecting plate made of a metal spring material having a lower elastic modulus than the metal bracket. Therefore, it is possible to suppress a large strain from acting on the support base due to the screw tightening force when the connecting plate is fixed to the support base, and it is possible to prevent a large strain from being applied to the display unit.

The connecting plate is elastically deformed between the fastening and fixing portion and the connecting and fixing portion, and is also elastically deformed between the fastening and fixing portion and the elastic contact portion, and this elastic force securely fixes the metal bracket to the support base. be able to. Further, since the bullet contact portion is bullet-contacted with the metal bracket and is not fixed to the metal bracket, both side portions of the connecting plate are not excessively restrained. Therefore, even if the connecting plate is relatively small, it can exert an optimum elastic force for connecting the support base and the metal bracket.

In addition, since the bullet contact portion of the connecting plate is in bullet contact with the metal bracket, it is possible to prevent the bullet contact portion that extends from the fastening and fixing portion and exerts elastic force from exerting the same function as the electromagnetic antenna, and is connected. It will be possible to prevent the board from absorbing electromagnetic noise.

A perspective view of the entire structure of the display device according to the embodiment of the present invention as viewed from the front. Partially enlarged cross-sectional view of the display device of the embodiment of the present invention cut along the line II-II of FIG. A partially disassembled perspective view of the display device shown in FIG. 2 as viewed from the direction III. A plan sectional view of the assembled state of the display device cut along the IV-IV line of FIG.

The display device 1 shown in each of FIGS. 1 to 4 is an in-vehicle display device. The Y1 direction is the front and the Y2 direction is the rear. The Y1 direction is the display direction. The X1 direction is the right direction when viewed from the rear, and the X2 direction is the left direction when viewed from the rear. The Z1 direction is the upward direction, and the Z2 direction is the downward direction.

As shown in FIGS. 1 and 2, the display device 1 has a support base 2. The support base 2 has a front base 3 and a rear base 4. The front base 3 and the rear base 4 are made of a synthetic resin material. Alternatively, it is die-cast using an aluminum alloy or the like. The front base 3 and the rear base 4 are fixed to each other by connecting screws (not shown) or the like. The support base 2 is fixed to a dash board or an instrument panel in the passenger compartment of an automobile via a fixing bracket. When an elevating device or a front-back moving device is installed on the dash board or the instrument panel, the support base 2 is mounted on the moving base of these devices.

As shown in FIG. 2, the display unit 10 is supported by the front base 3 constituting the support base 2. The display unit 10 includes a transparent cover plate 11 and a display cell 12 bonded to the rear thereof by an optical adhesive layer 13, a backlight unit 14 arranged behind the display cell 12 at intervals, and a backlight unit 14. Has a unit chassis 15 that supports.

The transparent cover plate 11 is a glass substrate or a transparent resin plate such as an acrylic plate. The transparent cover plate 11 has a front surface 11a facing forward (Y1 direction) and a back surface 11b facing rearward (Y2 direction). The display cell 12 is joined to the back surface 11b of the transparent cover plate 11 by an optical adhesive layer 13. A touch sensor is superposed on the back surface 11b or the front surface 11a of the transparent cover plate 11. The touch sensor has a transparent electrode formed on a transparent substrate or a transparent sheet, and when a finger or a hand comes into contact with or approaches the transparent cover plate 11, the contact or approach position is detected by a change in capacitance. Will be done.

The display cell 12 is a transmissive color liquid crystal display cell, and operates in, for example, an IPS mode. The color liquid crystal display cell operating in the IPS mode has a front polarizing plate from the Y1 side to the Y2 side, a front glass substrate provided with a color filter on the rear facing inner surface, a liquid crystal layer, and ITO or silver on the front facing inner surface. It is configured by stacking a rear glass substrate provided with a transparent electrode made of nanowires or the like and a rear polarizing plate in this order. The front polarizing plate is fixed to the back surface 11b of the transparent cover plate 11 via the optical adhesive layer 13. The color liquid crystal display cell is not limited to the one driven in the IPS mode, and may be operated by the TN method or the VA method. Alternatively, the display cell 12 may be an electroluminescence display cell.

The backlight unit 14 has a light guide plate made of acrylic resin or the like, a diffusion plate laminated on the front surface of the light guide plate, and a light source such as an LED that gives illumination light to the light guide plate. The unit chassis 15 is made of an aluminum plate, a stainless steel plate, or the like, and the back surface of the backlight unit 14 facing the rear (Y2 direction) is adhered to and fixed to the unit chassis 15.

As shown in FIG. 2, the front base 3 constituting the support base 2 is formed with a display opening 3a and a support front surface 3b formed around the display opening 3a. The area of the transparent cover plate 11 constituting the display unit 10 is formed to be wider than the area of the display portion of the display cell 12, and the peripheral portion of the transparent cover plate 11 is an adhesive to the support front surface 3b of the front base 3. It is fixed via the layer 16. The display cell 12 adhered to the transparent cover plate 11 is located inside the display opening 3a of the front base 3. Further, the side portion of the unit chassis 15 that supports the backlight unit 14 is fixed to the inner wall portion 3c behind the display opening 3a by fixing means such as adhesion, uneven fitting, or screwing.

As shown in FIG. 1, when the display device 1 is viewed from the front, the transparent cover plate 11 is fixed to a wide area in front of the front base 3, but the display cells 12 in the transparent cover plate 11 are overlapped with each other. The area covered is the display screen 18.

As shown in FIG. 2, the front base 3 constituting the support base 2 is provided with an operation opening 3d below the area where the transparent cover plate 11 is installed (in the Z2 direction). As shown in FIG. 1, the operation opening 3d is elongated in the left-right direction (X1-X2 direction), and a plurality of operation buttons 5 are arranged side by side in the operation opening 3d. As shown in FIG. 2, a board fixing surface 3e is formed at the lower part of the back surface of the front base 3 facing rearward (Y2 direction), and the circuit board 6 serving as an operation board is screwed to the board fixing surface 3e. It is fixed by the means of. The circuit board 6 is elongated in the left-right direction (X1-X2 direction), and the operation mechanism 7 is fixed to the front surface 6a facing forward (Y1 direction). The operation mechanism 7 of the embodiment is a push button mechanism, and a plurality of the operation mechanisms 7 are fixed side by side in the X1-X2 direction, and each operation mechanism 7 can be individually pressed by the operation button 5.

As shown in FIG. 2, a metal bracket 20 is provided behind the front base 3. The metal bracket 20 is made of a conductive metal material such as a stainless steel plate such as SUS304 or a rolled steel plate mainly made of iron. The metal bracket 20 has a function of reinforcing the front base 3 supporting the display unit 10 by the back surface, a function of shielding electromagnetic noise emitted when the display cell 12 is driven, or a function of shielding electromagnetic noise from the outside toward the display cell 12. It exhibits a function and a function of dissipating heat generated from the display cell 12.

The back surface of the front base 3 and the metal bracket 20 are fixed to each other by bracket fixing portions at a plurality of places. FIG. 2, FIG. 3 and FIG. 4 show one of the bracket fixing portions 40. In the bracket fixing portion 40, the circuit board 6 and a part of the metal bracket 20 are fastened and fixed together to the board fixing surface 3e of the front base 3.

As shown in FIG. 3, a female screw hole 3f is formed in a part of the substrate fixing surface 3e of the front base 3. The circuit board 6 has a screw insertion hole 6c opened in a portion facing the female screw hole 3f. The metal bracket 20 has an inner surface 20a facing in the Y1 direction and an outer surface 20b facing in the Y2 direction. The metal bracket 20 has an opening 21 formed in a portion corresponding to the bracket fixing portion 40. The opening 21 is a notch. Alternatively, the opening 21 may be a hole having a rectangular shape or the like. Around the opening 21, an abutting portion 22 which is a portion to be in contact with the back surface 6b of the circuit board 6 is formed by design.

The metal bracket 20 is formed with a connecting plate mounting portion 25 on the left side (X2 side) of the opening 21. The connecting plate mounting portion 25 is formed in a portion that rises rearward (in the Y2 direction) from the abutting portion 22. The connecting plate mounting portion 25 is formed with a caulking protrusion 23 and a positioning protrusion 24 that project in the Y1 direction. The caulking protrusion 23 is formed by so-called burring processing of a metal plate constituting the metal bracket 20, and the positioning protrusion 24 is formed by pressing the metal plate in the Y1 direction to form a ridge. The metal bracket 20 is provided with a bullet contact surface 26 on the right side (X1 side) of the opening 21. The bullet contact surface 26 is a part of the outer surface 20b of the metal bracket 20 at a portion protruding rearward (Y2 direction) from the abutting portion 22.

A connecting plate 30 is provided on the bracket fixing portion 40. The connecting plate 30 is a conductive metal plate, and is made of a metal spring material having a lower elastic coefficient (spring constant) in the bending direction than the metal plate constituting the metal bracket 20. The connecting plate 30 is made of, for example, a stainless steel plate having a spring property such as SUS304 whose thickness dimension is sufficiently smaller than that of the metal bracket 20.

As shown in FIG. 3, the connecting plate 30 has a fastening fixing portion 31, and a fixing hole 32 is formed in the fastening fixing portion 31. The connecting plate 30 is provided with a connecting fixing portion 33 on the left side (X2 side) of the fastening fixing portion 31 and a bullet contact portion 36 on the right side (X1 side) of the fastening fixing portion 31. A bent portion 30a is provided between the fastening and fixing portion 31 and the connecting and fixing portion 33, and the connecting and fixing portion 33 is located behind the fastening and fixing portion 31 (in the Y2 direction). A bent portion 30b is also provided between the fastening and fixing portion 31 and the bullet contact portion 36, and the bullet contact portion 36 is located behind the fastening and fixing portion 31 (in the Y2 direction). As shown in FIG. 4, the bullet contact portion 36 is located slightly rearward (in the Y2 direction) of the connecting and fixing portion 33. The caulking hole 34 and the positioning hole 35 are opened side by side in the connecting fixing portion 33 of the connecting plate 30, and the bullet contact portion 36 has a bullet contact protrusion 37 that rises toward the front (Y1 direction). It is formed in the pressing process.

The fastening fixing portion 31 is located between the connecting fixing portion 33 and the bullet contact portion 36, and the fastening fixing portion 31, the connecting fixing portion 33 and the bullet contact portion 36 are linearly arranged in the X1-X2 direction. The fixing hole 32, the caulking hole 34, the positioning hole 35, and the bullet contact protrusion 37 are also arranged side by side in a straight line in the X1-X2 direction. However, in the connecting plate 30, the straight line extending in the direction in which the fastening and fixing portion 31 and the connecting and fixing portion 33 are aligned and the straight line extending in the direction in which the fastening and fixing portion 31 and the bullet contact portion 36 are aligned are 180 degrees at 90 degrees or more. It may have an angle less than. Also in this case, the fastening fixing portion 31 is defined as being located between the connecting fixing portion 33 and the bullet contact portion 36.

As shown in FIG. 4, in the bracket fixing portion 40, the connecting plate 30 is fixed to the metal bracket 20. The connecting fixing portion 33 of the connecting plate 30 is installed on the inner surface 20a of the metal bracket 20 in the connecting plate mounting portion 25, the positioning protrusion 24 is inserted into the positioning hole 35, and the caulking protrusion 23 is inserted into the caulking hole 34. The caulking protrusion 23 is crushed, and the connecting fixing portion 33 is positioned on the connecting plate mounting portion 25 and is caulked and fixed. In the connecting plate 30, the bent portion 30b passes through the opening 21 toward the rear (Y2 direction), and the bullet contact protrusion 37 of the bullet contact portion 36 is a bullet contact portion of the outer surface 20b of the metal bracket 20. It is in contact with the surface 26. The connecting fixing portion 33 may be fixed to the metal bracket 20 by means such as screwing.

In the connecting plate 30, the connecting fixing portion 33 is positioned and fixed to the inner surface 20a of the metal bracket 20, and the elastically deformed portion 36 is strongly elastically contacted with the outer surface 20b of the metal bracket 20. , The connecting plate 30 is firmly fixed to the metal bracket 20 without relatively moving.

As shown in FIGS. 2 and 4, in the bracket fixing portion 40, the fixing screw 38 which is a fastening member is inserted into the fixing hole 32 formed in the fastening fixing portion 31 of the connecting plate 30, and the fixing screw 38 is a circuit board. Inserted into the screw insertion hole 6c of No. 6, the male screw portion 38a of the fixing screw 38 is screwed into the female screw hole 3f formed in the front base 3. As a result, the metal bracket 20, the front base 3, and the circuit board 6 are fastened to each other and fixed to each other via the connecting plate 30. As the fastening member, a press-fit rivet or a press-fit pin can be used instead of the fixing screw 38.

The front base 3 and the metal bracket 20 each have a dimensional tolerance at the time of manufacture, the metal bracket 20 is liable to warp, and the circuit board 6 also has an intersection in the thickness dimension, so that the tolerance is accumulated. As a result, an error is likely to occur in the relative position between the abutting portion 22 of the metal bracket 20 and the back surface 6b of the circuit board 6. Therefore, when the metal bracket 20 is assembled to the front base 3, a gap δ may be formed between the back surface 6b of the circuit board 6 and the abutting portion 22 as shown in FIG. Also in this case, by firmly tightening the fixing screw 38 and elastically deforming the connecting plate 30, the fastening fixing portion 31 of the connecting plate 30 is brought into close contact with the back surface 6b of the circuit board 6 without forcibly eliminating the gap δ. The front base 3 and the metal bracket 20 can be securely fixed.

Further, since the connecting plate 30 is greatly bent by the amount of the gap δ, the bullet contact protrusion 37 of the bullet contact portion 36 strongly presses the bullet contact surface 26 of the outer surface 20b of the metal bracket 20, and the connecting plate 30 causes the connecting plate 30 to strongly press. , The metal bracket 20 is strongly pressed against the circuit board 6. When the bullet contact portion 37 presses the metal bracket 20 in the Y1 direction, the front base 3 and the metal bracket 20 are firmly fixed. Since the elastic modulus (spring constant) of the connecting plate 30 is lower than the elastic modulus of the metal bracket 20, the front base 3 and the metal bracket 20 are directly screwed together with the dimensional tolerances accumulated. Compared with the fixed structure, the stress and strain applied to the front base 3 due to the elastic deformation of the connecting plate 30 can be reduced.

Therefore, it is possible to reduce display unevenness appearing in the display content of the display screen 18 of the display unit 10 supported by the front base 3, for example, black unevenness of the display content by the IPS type color liquid crystal display cell. The black unevenness here is a value obtained by dividing the "minimum luminance value" on the display screen of the color liquid crystal display cell by the "maximum luminance value" ("minimum luminance value" / "maximum luminance value" x 100 (. %)), And when the black unevenness is reduced, the above value becomes large.

As a first comparative example for comparison with the above-described embodiment, it is conceivable that the connecting plate 30 is not provided with the bullet contact portion 36 and is composed only of the fastening fixing portion 31 and the connecting fixing portion 33. In this case, when the fastening fixing portion 31 is fixed to the circuit board 6 with the fixing screw 38, the elastic force exerted by the deformation of the connecting plate 30 is too weak, and the front base 3 and the metal bracket 20 are fixed. The strength tends to decrease.

As a second comparative example, a structure is conceivable in which connecting and fixing portions 33 are provided on both sides of the fastening and fixing portion 31, and the connecting plate 30 is fixed to the metal bracket 20 by caulking or screwing on both sides of the fastening and fixing portion 31. In this second comparative example, since both ends of the connecting plate 30 are firmly fixed and restrained to the metal bracket 20, the deformation margin of the connecting plate 30 is reduced. Therefore, if the gap δ shown in FIG. 4 becomes large, the connecting plate 30 cannot follow due to the elastic deformation, and if the connecting plate 30 is forced to follow, the connecting plate 30 is likely to be plastically deformed or damaged. In this case, a very long and large connecting plate must be used, and a large space occupied by the bracket fixing portion 40 is required.

Further, when the connecting plate 30 is made of a conductive metal spring material, the elastic contact portion 36 functions in the same manner as the electromagnetic antenna, the elastic contact portion 36 absorbs the electromagnetic noise, and the display cell 12 is caused by the electromagnetic noise. There is a high possibility that a malfunction will occur or that the touch sensor provided on the transparent cover plate 11 will malfunction due to electromagnetic noise. However, in the connecting plate 30, the bullet contact portion 37 is formed in the bullet contact portion 36, and the bullet contact portion 37 is in contact with the conductive metal bracket 20, so that the bullet contact portion 36 and the metal bracket 20 are in contact with each other. At the same potential, the bullet contact portion 36 does not exert a function like an electromagnetic antenna. For that purpose, it is preferable that the connecting plate 30 and the metal bracket 20 have a ground potential due to the ground pattern formed on the circuit board 6 or other ground potential portions.

In the bracket fixing portion 40 shown in FIGS. 3 to 5, the circuit board 6 is sandwiched between the front base 3 and the metal bracket 20. By bringing the fastening fixing portion 31 of the connecting plate 30 into close contact with the ground pattern of the circuit board 6, there is an advantage that the connecting plate 30 can be directly set to the ground potential. However, in this structure, the tolerance of the thickness dimension of the circuit board 6 also affects the gap δ, but the tolerance of the thickness dimension of the circuit board 6 can be ignored due to the elastic deformation of the connecting plate 30. Become. When the bracket fixing portion 40 is set in a place where the circuit board 6 is not provided, the fastening fixing portion 31 of the connecting plate 30 is directly fixed to the front base 3 with the fixing screw 38.

In the display device 1 shown in FIGS. 1 and 2, the front base 3 and the metal bracket 20 are fixed at a plurality of places, but all of the fixing portions may be bracket fixing portions 40 using the connecting plate 30. .. Alternatively, the front base 3 and the metal bracket 20 may be directly screwed to the fixing portion located at a position away from the bracket fixing portion 40 on the XZ plane without using the connecting plate 30. That is, it is possible to arrange the fixing portion directly screwed and the bracket fixing portion 40 using the connecting plate 30 in combination.

1 Display device 2 Support base 3 Front base 3a Display opening 3f Female screw hole 4 Rear base 5 Operation button 6 Circuit board 6c Screw insertion hole 10 Display unit 11 Transparent cover plate 13 Optical adhesive layer 12 Display cell 14 Backlight 20 Metal bracket 21 Opening 22 Butt 23 Caulking protrusion 24 Positioning protrusion 25 Connecting plate mounting part 26 Bullet contact surface 30 Connecting plate 31 Fastening fixing part 32 Fixing hole 33 Connecting fixing part 34 Caulking hole 35 Positioning hole 36 Bullet contact Part 37 Bullet contact part 38 Fixing screw (fastening member)

Claims (5)

In a display device having a display unit having a display cell, a support base for supporting the display unit, and a metal bracket arranged on the back of the display unit.
A connecting plate made of a metal spring material having a lower elastic modulus than the metal bracket is provided, and the connecting plate is located between the connecting fixing portion and the elastic contact portion and between the connecting fixing portion and the elastic contact portion. It has a fastening fixing part and has a fastening fixing part.
The display device is characterized in that the connecting and fixing portion is fixed to the metal bracket, the elastically contacting portion is elastically contacted to the metal bracket, and the fastening and fixing portion is fixed to the support base by a fastening member. .. The display device according to claim 1, wherein both the metal bracket and the connecting plate are formed of a conductive metal plate. The display device according to claim 1 or 2, wherein the fastening fixing portion, the elastic contact portion, and the connecting fixing portion are formed side by side in a straight line. One of claims 1 to 3, wherein the connecting fixing portion is fixed to an inner surface of the metal bracket facing the display unit, and the elastic contact portion is in contact with an outer surface of the metal bracket opposite to the inner surface. The display device described in. The circuit board is sandwiched between the support base and the fastening and fixing portion, and the circuit board is fixed to the support base together with the fastening and fixing portion by screwing to any one of claims 1 to 4. The display device described.

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