JP2013210467A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the occurrence of warpage at the time of a temperature change.SOLUTION: A display device includes a display having a display surface on which an image is displayed, and a back chassis disposed on the side of a surface opposite to the display surface of the display. A part of a second member having a linear expansion coefficient different from that of a first member is fixed to the first member, the second member includes a fixed part which is fixed to the first member and a non-fixed part which is not fixed to the first member, and an expansion/contraction absorbing part which absorbs the difference in the amount of expansion/contraction at the time of temperature change between the first member and the second member due to the difference in the linear expansion coefficient between them is formed in the non-fixed part. Thus the occurrence of warpage at the time of the temperature change can be suppressed.

Description

  The present technology relates to the technical field of display devices. Specifically, in a state in which a part of the first member and the second member having different linear expansion coefficients are fixed, an expansion / contraction absorption part is formed in the non-fixed part of the second member to generate a warp when the temperature changes. It is related with the technical field to suppress.

  A display device such as a television receiver or a personal computer has a display having a display surface on which an image is displayed and a housing for holding the display, and a light source and a circuit board serving as a heat source are arranged inside the housing. The

  As a structure of such a display device, there is a place where another member is fixed to a predetermined member. For example, in order to reduce the thickness and weight of the display device, there is a case where the thickness of the back chassis constituting a part or the whole of the housing is reduced. At the same time, in order to increase the mechanical strength, The reinforcing plate (second member) may be fixed to a part of the first member (see, for example, Patent Document 1).

JP 2006-189543 A

  By the way, in the display device described in Patent Document 1, when the mechanical strength is increased by the reinforcing plate, the reinforcing plate may be formed of a material having rigidity higher than that of the back chassis. The linear expansion coefficient of the chassis may be different.

  However, in a display device, if a light source or a circuit board serving as a heat source is disposed inside, the expansion and contraction of the back chassis and the reinforcing plate having different linear expansion coefficients when the internal temperature change occurs according to the heat generation state. The amount may be different and the back chassis and the reinforcing plate may be warped.

  Further, even when a heat source is not mounted inside, there is a possibility that the above warp may occur due to a change in the external environment.

  When such a warp occurs, there is a possibility that a good function of each member is impaired, or that each member is damaged or cracked.

  Therefore, an object of the present technology display device is to solve the above-described problems and to suppress the occurrence of warpage when the temperature changes.

  First, in order to solve the above-described problem, the display device includes a display on which an image is displayed on the display surface, and a back chassis disposed on the surface of the display opposite to the display surface. A part of the second member having a linear expansion coefficient different from that of the first member is fixed to the first member, and the second member is provided with a portion fixed to the first member as a fixing portion. A portion not fixed to one member is provided as a non-fixed portion, and the non-fixed portion is provided with a difference in expansion / contraction amount at the time of temperature change due to a difference in linear expansion coefficient between the first member and the second member. An expansion / contraction absorption part to absorb is formed.

  Therefore, in the display device, the difference in expansion / contraction amount between the first member and the second member is absorbed by the expansion / contraction absorption part of the second member.

  Second, in the display device described above, the second member is formed in a shape having a longitudinal direction, the stretchable absorption part is formed in a shape extending in a predetermined direction, and the extending direction of the stretchable absorption part and the It is desirable that the second member be in a direction other than the direction perpendicular to the longitudinal direction of the second member.

  The second member is formed in a shape having a longitudinal direction, the stretchable absorption part is formed in a shape extending in a predetermined direction, and the direction other than the direction in which the extending direction of the stretchable absorption part and the longitudinal direction of the second member are orthogonal to each other Thus, the difference in the amount of expansion and contraction in both the longitudinal direction and the lateral direction of the second member when the temperature change occurs is absorbed.

  Third, in the display device described above, it is desirable that a slit, a hole, or a notch is formed as the expansion / contraction absorption part.

  By forming a slit, a hole, or a notch as the expansion / contraction absorption part, formation of the expansion / contraction absorption part to the second member is facilitated.

  Fourth, in the display device described above, it is desirable that the expansion / contraction absorption part is formed as a heat dissipation part that releases heat to the outside.

  By forming the expansion / contraction absorption part as a heat dissipation part that releases heat to the outside, the heat dissipation in the display device is enhanced and the amount of change in temperature is reduced.

  Fifth, in the display device described above, it is preferable that a protrusion protruding in a direction away from the first member is formed as the expansion / contraction absorption part.

  By forming the protrusion protruding in the direction away from the first member as the expansion / contraction absorption part, formation of the expansion / contraction absorption part with respect to the second member is facilitated.

  Sixthly, in the display device described above, it is preferable that a plurality of the second members are provided and a part of each of the plurality of second members is overlapped.

  A plurality of second members are provided, and a part of each of the plurality of second members is overlapped, thereby ensuring high mechanical strength of the second member.

  Seventh, in the display device described above, each of the plurality of second members is formed in a shape having a longitudinal direction, and at least one second member is another second member when expanded and contracted during the temperature change. It is desirable to be movable in the longitudinal direction with respect to the member.

  The plurality of second members are each formed in a shape having a longitudinal direction, and at least one second member is movable in the longitudinal direction with respect to the other second members when expanded and contracted when the temperature changes. Accordingly, one second member is moved in the longitudinal direction with respect to the other second member in a state where each part of the plurality of second members is overlapped.

  The present technology display device includes a display on which an image is displayed on a display surface, and a back chassis disposed on a surface opposite to the display surface of the display, and the first member is a line with the first member. A part of the second member having a different expansion coefficient is fixed, and the second member is provided with a part fixed to the first member as a fixing part and a part not fixed to the first member is non-fixed. An expansion / contraction absorbing portion that is provided as a fixing portion and absorbs a difference in expansion / contraction amount at the time of temperature change due to a difference in linear expansion coefficient between the first member and the second member is formed in the non-fixing portion.

  Therefore, it is possible to suppress the occurrence of warpage when the temperature changes.

  In the technique described in claim 2, the second member is formed in a shape having a longitudinal direction, the stretch absorption part is formed in a shape extending in a predetermined direction, and the extension direction of the stretch absorption part is The second member has a direction other than the direction perpendicular to the longitudinal direction of the second member.

  Therefore, the difference between the expansion and contraction amounts in both the longitudinal direction and the short direction of the first member when the temperature change occurs is absorbed, and the first member and the second member when the temperature change occurs. The occurrence of warpage can be satisfactorily suppressed.

  In the technique described in claim 3, a slit, a hole, or a notch is formed as the expansion / contraction absorbing portion.

  Therefore, it is easy to form the expansion / contraction absorption part with respect to the second member, and it is possible to improve workability in the work (processing work) for forming the expansion / contraction absorption part with respect to the second member.

  In the technique described in claim 4, the expansion and contraction absorbing portion is formed as a heat radiating portion that releases heat to the outside.

  Therefore, the heat dissipation in the display device is enhanced, the amount of change in temperature is reduced, and the occurrence of warpage can be further suppressed.

  In the technique described in claim 5, a protrusion protruding in a direction away from the first member is formed as the expansion / contraction absorption part.

  Therefore, it is easy to form the expansion / contraction absorption part with respect to the second member, and it is possible to improve workability in the work (processing work) for forming the expansion / contraction absorption part with respect to the second member.

  In the technique described in claim 6, a plurality of the second members are provided, and a part of each of the plurality of second members is overlapped.

  Therefore, the high mechanical strength of the first member can be ensured while ensuring the high warping suppression effect of the first member and the second member.

  In the technique according to claim 7, the plurality of second members are each formed in a shape having a longitudinal direction, and at least one second member is expanded and contracted when the temperature changes. The second member is movable in the longitudinal direction.

  Therefore, the higher mechanical strength of the first member can be ensured and the warpage of the first member and the second member can be further suppressed.

  Hereinafter, the best mode for carrying out the display device of the present technology will be described with reference to the accompanying drawings.

  In the best mode described below, the display device of the present technology is applied to a television receiver.

  Note that the scope of application of the present technology is not limited to a television receiver, and can be widely applied to various display devices such as a mobile phone having a display, a mobile terminal, a personal computer, and a monitor.

[Configuration of display device]
The display device (television receiver) 1 is formed in, for example, a horizontally long, flat and substantially rectangular shape, and required parts are arranged inside the housing 2 (see FIGS. 1 and 2). The display device 1 is held by a stand (not shown), for example.

  The housing 2 has a bezel 3 positioned on the front side and a back chassis 4 positioned on the rear side.

  The bezel 3 is formed in a substantially rectangular frame shape.

  The back chassis 4 is formed in a shallow box shape opened forward, and protrudes in a state of being inclined so as to be displaced outward from the outer periphery of the rectangular base surface portion 5 and the base surface portion 5 toward the front and rear. .. And the frame-like portion 7 that is continuous with the front edges of the side surfaces 6, 6,... Are integrally formed.

  Reinforcing plates 8 and 8 formed in a horizontally long rectangular shape are fixed to the front surface 5a of the base surface portion 5 so as to be separated from each other in the vertical direction (see FIGS. 2 and 3).

  The back chassis 4 is provided as a first member, and the reinforcing plates 8 and 8 are provided as second members, respectively. The reinforcing plates 8 and 8 provided as the second member have a function of increasing the mechanical strength of the back chassis 4 provided as the first member, and are formed of a material having a linear expansion coefficient different from that of the back chassis 4. Has been. The back chassis 4 is made of, for example, aluminum in order to reduce the weight, and the reinforcing plates 8 and 8 are made of, for example, iron in order to increase mechanical strength.

  The reinforcing plate 8 is provided with fixing portions 9, 9,... Are fixed to the base surface portion 5 of the back chassis 4, and the fixing portions 9, 9,... Are fixed to the base surface portion 5 by, for example, a double-sided tape or an adhesive. It is carried out by an appropriate method such as adhesion, screwing, caulking, or welding.

  The portions other than the fixing portions 9, 9,... Of the reinforcing plate 8 are provided as non-fixing portions 10. The non-fixing portions 10 are in contact with the front surface 5 a of the base surface portion 5, but are not fixed. The non-fixed part 10 is formed with slits 11, 11,.

  The slits 11, 11,... Are formed in a state extending in a direction other than the direction orthogonal to the longitudinal direction of the reinforcing plate 8, for example, a direction inclined by 45 ° with respect to the direction orthogonal to the longitudinal direction. The slits 11, 11,... Are formed, for example, so that the inclination directions are symmetrical in the left half and the right half of the reinforcing plate 8.

  In addition, although the example in which the slits 11, 11,... Are formed as the expansion / contraction absorption part is shown above, the expansion / contraction absorption part is not limited to the slits 11, 11,. May be formed.

  By forming the expansion / contraction absorption part by the slits 11, 11,..., Holes or notches, the expansion / contraction absorption part can be easily formed on the reinforcement plate 8, and the expansion / contraction absorption part is formed on the reinforcement plate 8 (processing work). ) Can be improved.

  A circuit board (not shown) is attached to the rear surface of the base surface portion 5 in the back chassis 4. The circuit board functions as a control circuit that supplies current to a display, which will be described later, supplies drive current to a light source, which will be described later, and the like and controls the entire display device 1.

  A rear cover 12 that closes the circuit board is attached to the rear surface of the base surface portion 5 by screws or the like (see FIG. 1). The rear cover 12 is formed in a shallow box shape opened forward and is attached to a lower end side portion of the back chassis 4.

  A light source (not shown) is disposed inside the housing 2. As the light source, for example, a cold cathode fluorescent lamp (CCFL) or a light emitting diode (LED) is used. The light source functions as a backlight, for example.

  Although not shown in the figure, the casing 2 includes a reflection sheet that reflects light emitted from the light source forward, an optical sheet for polarizing and guiding light emitted from the light source, and the light source. A diffusion sheet or the like for diffusing the emitted light is disposed as necessary.

  A display 13 is held on the front end side of the back chassis 4 (see FIGS. 1 and 2). The display 13 is, for example, a liquid crystal panel formed by laminating a glass substrate, a polarizing sheet, and the like, and the front surface is formed as a display surface 13a on which an image is displayed.

  The display 13 is formed in a substantially rectangular shape, and has a connection terminal portion 13b at the lower end. The display 13 is provided as a display area where an image is displayed at a portion other than the outer periphery.

  When the display 13 is a self-luminous type such as an organic EL (Organic Electro Luminescence) display, a light source that functions as a backlight is not arranged.

  The display 13 is connected to a circuit board having a connection terminal portion 13 b attached to the rear surface of the back chassis 4.

  The bezel 3 is attached to the frame-like portion 7 of the back chassis 4. Attachment of the bezel 3 to the frame-like portion 7 is performed by appropriate means such as screwing or adhesion, for example. By attaching the bezel 3 to the frame-like portion 7, the outer peripheral portion of the display 13 is pressed by the bezel 3, and the display 13 is held by the bezel 3 and the back chassis 4.

[Temperature change in display device]
In the display device 1, the internal temperature changes when light is emitted from the light source or due to a change in the external environment.

  At this time, the expansion and contraction amounts of the back chassis 4 and the reinforcing plates 8 and 8 differ depending on the difference in linear expansion coefficient, but the difference in expansion and contraction is absorbed by the slits 11, 11... Formed in the reinforcing plates 8 and 8. Thus, warpage of the back chassis 4 and the reinforcing plates 8 and 8 is suppressed.

[Modification]
Below, the modification of a reinforcement board is demonstrated (refer FIG. 4 thru | or FIG. 9).

  The first modification is provided as a reinforcing plate 8A, and the reinforcing plate 8A is provided with a protrusion 11A that functions as an expansion / contraction absorbing portion in the non-fixed portion 10A, for example, at the center in the left-right direction (see FIG. 4). ). For example, the protrusion 11A is formed in a substantially semi-cylindrical shape and protrudes forward. Note that the reinforcing plate 8A may be provided with a plurality of protrusions 11A, 11A,.

  Since the expansion / contraction absorption part is provided as the protrusion 11A, the expansion / contraction absorption part is formed by providing a protruding portion on a part of the reinforcement plate 8A. Therefore, the expansion / contraction absorption part can be easily formed on the reinforcement plate 8A. Further, it is possible to improve the workability in the work (processing work) for forming the expansion and contraction absorbing portion with respect to the reinforcing plate 8A.

  When the temperature inside the display device 1 is changed, the amount of expansion and contraction between the back chassis 4 and the reinforcing plates 8A and 8A differs depending on the linear expansion coefficient, but the protrusions 11A provided on the reinforcing plates 8A and 8A, 11A is expanded and contracted, the difference in expansion / contraction amount between the back chassis 4 and the reinforcing plates 8A and 8A is absorbed, and the warp between the back chassis 4 and the reinforcing plates 8A and 8A is suppressed.

  Instead of the reinforcing plate 8A, for example, as shown in FIG. 5, it is also possible to use a reinforcing plate 8B in which a protrusion 11B is provided on the non-fixed portion 10B.

  The protrusion 11B is composed of a plurality of protrusions 11a and 11a that are continuous from side to side. By configuring the protrusion 11B with the protrusions 11a and 11a, it is possible to increase the amount of expansion and contraction when the temperature changes, and to further suppress warpage of the back chassis 4 and the reinforcing plates 8B and 8B. Become.

  A second modified example is two reinforcing plates 8C, 8C,... That are provided apart from each other and joined together (see FIG. 6). Reinforcing plates 8C and 8C are provided with connecting pieces 14 and 14 projecting laterally from substantially upper and lower halves at the respective ends of the non-fixed portions 10C and 10C on the adjacent side.

  The coupling piece 14 of one reinforcing plate 8C is superimposed on the end of the other reinforcing plate 8C from the front, and the coupling piece 14 of the other reinforcing plate 8C is superimposed on the end of the one reinforcing plate 8C from the front. 8C and 8C are coupled in the left-right direction.

  The reinforcing plate 8C is formed with slits, holes, notches or protrusions as expansion and contraction absorbing portions. .. Of the reinforcing plate 8C are fixed to the back chassis 4 by, for example, screw members 15, 15,.

  When the temperature inside the display device 1 is changed, the amount of expansion / contraction of the back chassis 4 and the reinforcing plates 8C and 8C differs depending on the linear expansion coefficient, but the expansion / contraction absorbing portion provided on the reinforcing plates 8C and 8C. Differences in the amount of expansion and contraction between the back chassis 4 and the reinforcing plates 8C and 8C are absorbed, and warpage between the back chassis 4 and the reinforcing plates 8C and 8C is suppressed.

  In the second modified example, two reinforcing plates 8C, 8C are coupled, and the length of one reinforcing plate 8C in the longitudinal direction is short, and accordingly, the reinforcing plates 8C, one by one when the temperature changes, Since the amount of expansion / contraction of 8C is small, the warpage suppression efficiency of the back chassis 4 and the reinforcing plates 8C and 8C is high.

  In addition, since the two reinforcing plates 8C and 8C are coupled, the total length is sufficiently secured, and the high mechanical strength of the housing 2 can be secured, and the back chassis 4 and the reinforcing plate 8C are secured. The high mechanical strength of the housing 2 can be ensured after ensuring the high curbing effect of 8C.

  In the reinforcing plates 8C and 8C, as shown in FIG. 7 and FIG. 8, screw insertion holes 14a and 14a that are long in the longitudinal direction of the reinforcing plates 8C and 8C are formed in the coupling pieces 14 and 14, respectively. Screw holes 8a, 8a are formed in the portion, and the reinforcing plates 8C, 8C may be coupled by stepped screws 16, 16.

  In this case, the reinforcing plates 8C and 8C are joined by the stepped screws 16 and 16 being inserted into the screw insertion holes 14a and 14a and screwed into the screw holes 8a and 8a, respectively.

  As described above, the reinforcing plates 8C and 8C are coupled by the stepped screws 16 and 16, so that higher mechanical strength of the housing 2 can be ensured. Further, when the reinforcing plates 8C and 8C are expanded and contracted when the temperature changes, the stepped screws 16 and 16 are relatively moved in the screw insertion holes 14a and 14a (see FIG. 9). By connecting the reinforcing plates 8C and 8C, the expansion and contraction of the reinforcing plates 8C and 8C is not hindered.

  Therefore, the reinforcing plates 8C and 8C are coupled by the stepped screws 16 and 16 inserted through the screw insertion holes 14a and 14a, so that higher mechanical strength of the housing 2 can be secured and the back chassis 4 can be secured. Further, warping of the reinforcing plates 8C and 8C can be further suppressed.

[Measurement results regarding warpage]
Below, the measurement result (analysis result) by the simulation regarding the generation amount of curvature when the 2nd member (reinforcement board) is fixed to the 1st member is explained (refer to Drawing 10 and Drawing 11).

  The first member used for measurement is formed of glass, and the second member is formed of aluminum. In the analysis model in the measurement, the second member is provided with four fixing portions at left and right sides, and is fixed to the lower end portion of the first member (see FIG. 10). In this model, the first member has a length L1 of 705 mm, a width H1 of 1240 mm, and a thickness T1 of 1.8 mm, and the second member has a length L2 of 160 mm, a width H2 of 1210 mm, and a thickness T2 of 2. The fixing part of the second member has a length L3 of 130 mm and a width H3 of 10 mm.

  As shown in FIG. 11, the measurement is performed using the second member in which the slits shown in (A) are not formed, the second member shown in (B) with a small number of slits, and the number of slits shown in (C). This was done by analyzing the state of occurrence of warping in the state in which the fixing portions of many second members were fixed to the first member, respectively. In FIG. 11, the second member is shown only on one of the left and right sides, and the analysis was performed on only one side of the left and right.

  The area (opening ratio) of the slit (expansion / absorption part) shown in (B) and (C) with respect to the entire second member is about 3% and about 6.5%, respectively.

  The vertical axis shown in FIG. 11 indicates the maximum value (maximum displacement) of the warpage amount. As a result of analysis, the maximum value of the warpage amount increases in the order of (A), (B), and (C). Obtained. Therefore, it was confirmed that the amount of warpage decreases as the area of the expansion / contraction absorption part with respect to the entire second member increases.

[Summary]
As described above, in the display device 1, the back chassis 4 and the reinforcing plates 8, 8 </ b> A, 8 </ b> B, 8 </ b> C are respectively attached to the non-fixed portions 10, 10 </ b> A, 10 </ b> B, 10 </ b> C of the reinforcing plates 8, 8 </ b> A, 8 </ b> B, 8 </ b> C. Stretch absorption parts (slits 11, 11,..., Holes, notches, or protrusions 11A, 11B) that absorb the difference in the amount of expansion / contraction at the time of temperature change due to the difference in linear expansion coefficient are formed.

  Therefore, it is possible to suppress the occurrence of warpage when the temperature changes while securing the high mechanical strength of the housing 2.

  In particular, the deformation of each part is reduced by suppressing warpage, and it is possible to prevent breakage and cracking of each member due to relaxation of stress concentration, and to suppress the occurrence of unevenness due to deformation that reduces the merchantability. it can.

  Further, since substantially the entire reinforcing plates 8, 8A, 8B, and 8C are in contact with the back chassis 4, for example, when heat is radiated from the back chassis 4 via the reinforcing plates 8, 8A, 8B, and 8C, it is favorable. It is possible to ensure heat dissipation performance.

  Furthermore, as described above, in the reinforcing plate 8, the slits 11, 11,..., Holes or notches are formed in a state extending in a direction other than the direction orthogonal to the longitudinal direction of the reinforcing plate 8.

  Therefore, the difference in expansion and contraction in both the longitudinal direction (left and right direction) and the short direction (vertical direction) of the reinforcing plate 8 when the temperature change occurs is absorbed, and the back chassis 4 when the temperature change occurs. And generation | occurrence | production of the curvature of the reinforcement boards 8 and 8 can be suppressed favorably.

  Furthermore, the slits 11, 11,..., Holes or notches formed in the reinforcing plate 8 can be used as heat radiating portions that release heat generated inside the display device 1 to the outside.

  Thus, by making the slits 11, 11,..., Holes or notches into the heat radiating portion, the heat dissipation in the display device 1 is increased, the amount of change in temperature is reduced, and the occurrence of warpage can be further suppressed. become.

  When the slits 11, 11,..., Holes or notches are used as the heat radiating portions, heat is also radiated to the portions of the base surface portion 5 of the back chassis 4 facing the slits 11, 11,. It is desirable to form holes.

  Moreover, although the back chassis 4 was made into the 1st member and the reinforcement board 8, 8A, 8B, 8C was made into the 2nd member above, the 1st member and the 2nd member were shown. The back chassis 4 and the reinforcing plates 8, 8A, 8B, 8C are not limited. The first member and the second member can be applied to arbitrary members as long as they have different linear expansion coefficients and are partially fixed, and the present technology has different linear expansion coefficients in the display device 1. It is possible to apply to each part to which a part of two members were fixed.

  In addition, although the example which formed the expansion-contraction absorption part in the non-fixed part of the 2nd member (reinforcement board) was shown above, the expansion-contraction absorption part is formed in both the 1st member and the 2nd member. May be.

[Technology]
The present technology may be configured as follows.

  (1) A display on which an image is displayed on a display surface, and a back chassis disposed on a surface opposite to the display surface of the display are provided, and the first member has a linear expansion coefficient different from that of the first member. A part of a different second member is fixed, the second member is provided with a portion fixed to the first member as a fixing portion, and a portion not fixed to the first member is a non-fixing portion. A display device provided with an expansion / contraction absorption part provided in the non-fixed part to absorb a difference in expansion / contraction amount at the time of temperature change due to a difference in linear expansion coefficient between the first member and the second member.

  (2) The second member is formed in a shape having a longitudinal direction, the stretch absorption part is formed in a shape extending in a predetermined direction, the extension direction of the stretch absorption part and the longitudinal direction of the second member The display device according to (1), wherein the direction is a direction other than a direction orthogonal to each other.

  (3) The display device according to (1) or (2), wherein a slit, a hole, or a notch is formed as the expansion / contraction absorbing portion.

  (4) The display device according to (3), wherein the expansion / contraction absorption part is formed as a heat dissipation part that releases heat to the outside.

  (5) The display device according to (1) or (2), wherein a protrusion protruding in a direction away from the first member is formed as the expansion / contraction absorption part.

  (6) The display device according to any one of (1) to (5), wherein a plurality of the second members are provided and a part of each of the plurality of second members is overlapped.

  (7) Each of the plurality of second members is formed in a shape having a longitudinal direction, and at least one second member is stretched in the longitudinal direction with respect to other second members when expanded and contracted during the temperature change. The display device according to (6), wherein the display device is movable.

  The specific shapes and structures of the respective parts shown in the best mode for carrying out the above-described technology are merely examples of the implementation when the present technology is implemented, and accordingly, the present technology This technical scope should not be interpreted in a limited way.

The display device of the present technology is shown together with FIGS. 2 to 11, and this diagram is a perspective view of the display device. It is a schematic exploded perspective view of a display apparatus. It is a perspective view which shows the state by which the reinforcement board was fixed to the back chassis. It is a perspective view which shows the state by which the reinforcement board of the 1st modification provided with the protrusion as an expansion-contraction absorption part was fixed. It is a perspective view which shows the state to which the reinforcement board of the 1st modification provided with the protrusion of the shape different from FIG. 4 as an expansion-contraction absorption part was fixed. It is a perspective view which shows the 2nd modification of a reinforcement board. It is a perspective view which shows the example by which the two reinforcement boards were couple | bonded by the stepped screw in the 2nd modification of a reinforcement board. It is an expanded sectional view showing a part of the 2nd modification of a reinforcing board. It is an expanded sectional view which shows a state when expansion-contraction arises in the 2nd modification of a reinforcement board. The measurement result regarding the amount of warpage will be described together with FIG. 11, and this figure is a perspective view showing an analysis model. It is a figure which shows each 2nd member used for the measurement, and an analysis result.

  DESCRIPTION OF SYMBOLS 1 ... Display apparatus, 4 ... Back chassis (1st member), 8 ... Reinforcement board (2nd member), 9 ... Fixed part, 10 ... Non-fixed part, 11 ... Slit (expansion-absorption absorption part), 13 ... Display 8A ... Reinforcing plate (second member), 10A ... Non-fixed portion, 11A ... Projection (extension / absorption part), 8B ... Reinforcement plate (second member), 10B ... Non-fixed portion, 11B ... Projection ( Stretchable absorption part), 8C ... Reinforcing plate (second member), 10C ... Non-fixed part

Claims (7)

A display that displays an image on the display surface;
A back chassis disposed on the opposite side of the display surface of the display,
A part of the second member having a linear expansion coefficient different from that of the first member is fixed to the first member,
In the second member, a portion fixed to the first member is provided as a fixed portion, and a portion not fixed to the first member is provided as a non-fixed portion,
A display device in which the non-fixed portion is formed with an expansion / contraction absorption portion that absorbs a difference in expansion / contraction amount at the time of temperature change due to a difference in linear expansion coefficient between the first member and the second member. The second member is formed in a shape having a longitudinal direction;
The stretch absorbing part is formed in a shape extending in a predetermined direction,
The display device according to claim 1, wherein a direction other than a direction in which the extending direction of the stretchable absorption part and the longitudinal direction of the second member are orthogonal to each other is set. The display device according to claim 1, wherein a slit, a hole, or a notch is formed as the expansion and contraction absorbing portion. The display device according to claim 3, wherein the expansion / contraction absorption part is formed as a heat dissipation part that releases heat to the outside. The display device according to claim 1, wherein a protrusion that protrudes in a direction away from the first member is formed as the stretchable absorption portion. A plurality of the second members are provided,
The display device according to claim 1, wherein a part of each of the plurality of second members is overlapped. The plurality of second members are each formed in a shape having a longitudinal direction,
The display device according to claim 6, wherein at least one second member is movable in the longitudinal direction with respect to another second member when expanded or contracted during the temperature change.

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