JP6700783B2 - Display device - Google Patents

Description

  The present invention relates to a display device.

A display panel such as a liquid crystal panel or an organic EL (electroluminescence) panel is one in which a display element such as a liquid crystal or an organic light emitting element is provided between two glass substrates on which a thin film device is formed.
A conventional structure will be described with reference to FIGS. 12 and 13. In a display device 1 including a display panel 2, a base 7 which is a metal case in which the display panel 2 is housed or adhered is arranged on the side opposite to the display surface, and the display surface side is covered with a metal frame 3. It has become. When the display panel 2 is a liquid crystal display panel, the display device 1 includes a liquid crystal display panel and a backlight unit 5 that illuminates the liquid crystal display panel. The backlight unit 5 is provided with optical sheets that collect light. The backlight unit 5 also includes a substrate, a light source, a reflection sheet and the like. In order to maintain a constant space between the display panel 2 and the optical sheets, and to hold the liquid crystal display panel itself, a panel holder 4 is arranged so as to cover the periphery and the back surface of the display panel 2. The panel holder 4 is often made of resin. The panel holder 4 has a panel support portion 40 that supports the lower end portion of the display panel 2. The display panel 2 is sandwiched by the frame 3 and the panel holder 4 arranged on the front surface of the display panel 2 via a front elastic body and a rear elastic body such as a cushion. The front elastic body and the rear elastic body are arranged on the four sides of the display panel 2. The front elastic body includes a lower rear elastic body 10, a left rear elastic body 15, a right rear elastic body 16, an upper rear elastic body 17, and the like.

On the other hand, when stress concentration occurs in the display surface of the display panel 2, the brightness uniformity and chromaticity uniformity of the screen locally deteriorate. These are called display unevenness. For example, in the case of a liquid crystal display panel, when stress concentration occurs, the alignment of the liquid crystal is forcibly disturbed and the voltage application control does not function sufficiently, so that display unevenness 9 as shown in FIG. 11 occurs.
Patent Document 1 discloses a structure in which the stress applied to the display panel is relaxed by making the physical properties of the material of the holding member holding the display panel different in the direction perpendicular to the panel surface (thickness direction).

JP, 2009-92716, A

In a display device including a display panel, warpage may occur at the four corners of the display panel due to changes in operating environment such as temperature and humidity. One of the causes of the warp is due to the characteristics of the polarizing plates attached to the front and back surfaces of the display panel. For example, the front panel and the back panel have different expansion rates and contraction rates, or different expansion and contraction directions, so that the display panel is warped. Further, warpage may occur due to a difference in thermal expansion due to a temperature difference between the front surface and the back surface of the display panel 2.
In the above-mentioned conventional technique, when the display panel 2 is warped, the frictional force 41 is generated in the vicinity of the panel support portion 40. Further, by compressing the lower side front elastic body 30, a front holding force 42 acting on the display panel 2 from the front side is generated. When the lower rear elastic body 10 is compressed, a rear surface holding force 43 acting on the display panel 2 from the rear surface side is generated. As described above, various stresses act on the display panel 2 due to the warp of the display panel 2. As a result, the display panel 2 has a problem that stress is locally concentrated in the vicinity of the support portion and display unevenness occurs.
Further, in Patent Document 1, since materials having different physical properties in the thickness direction are uniformly used in the side direction, the display panel may move to a position deviated from the optimum position in the thickness direction of the display panel. It was As a result, the panel holding force is weakened, and when an external force is applied to the surface of the liquid crystal panel, the amount of deformation of the display panel and the stress of the display panel are increased, which causes a problem that display unevenness is likely to occur.

  Therefore, it is an object of the present invention to suppress display unevenness when a display panel of a display device is warped.

The first aspect of the present invention is
Display panel,
A first holding member for holding a plurality of sides of the display panel from the front side;
A first cushioning member arranged between a front surface of a region along a lower side of the plurality of sides of the display panel and the first holding member;
A second holding member for holding the display panel from the back side;
A second cushioning member disposed between the second holding member and a back surface of a region along the lower side of the display panel;
A support member that supports a part of the lower side of the display panel from below,
Equipped with
Of the region along the lower side, the force applied from the first cushioning member to the first region corresponding to the part supported by the support member, and the second region to the first region. The total of the force exerted by the cushioning member is the force exerted by the first cushioning member on the second region different from the first region in the region along the lower side, and the second force on the second region. The display device is characterized in that it is smaller than the total of the force applied from the buffer member.
The second aspect of the present invention is
Display panel,
A first holding member for holding the display panel from the front side;
A first cushioning member disposed between the first holding member and the front surface of the region along the lower side of the display panel;
A second holding member for holding the display panel from the back side;
A plurality of second cushioning members arranged between the second holding member and a back surface of a region along the lower side of the display panel;
A support member for supporting a part of the display panel from below,
A Ru display device comprising a,
The plurality of second cushioning members are arranged so that a space is provided at least at a position corresponding to a portion of the display panel supported by the central portion of the support member when viewed from the front side of the display device. It is a display device characterized by the above.
A third aspect of the present invention is
Display panel,
A first holding member for holding a plurality of sides of the display panel from the front side;
A first cushioning member arranged between a front surface of a region along a lower side of the plurality of sides of the display panel and the first holding member;
A second holding member for holding the display panel from the back side;
A second cushioning member disposed between the second holding member and a back surface of a region along the lower side of the display panel;
A support member that supports a part of the lower side of the display panel from below,
Equipped with
At least one portion of the first cushioning member and the second cushioning member corresponding to the first region corresponding to the part supported by the supporting member in the region along the lower side is on the lower side. The display device is characterized in that it is smaller than at least one portion of the first cushioning member and the second cushioning member corresponding to a second region different from the first region in the region along the line.
A fourth aspect of the present invention is
Display panel,
A first holding member for holding a plurality of sides of the display panel from the front side;
A first cushioning member arranged between a front surface of a region along a lower side of the plurality of sides of the display panel and the first holding member;
A second holding member for holding the display panel from the back side;
A second cushioning member disposed between the second holding member and a back surface of a region along the lower side of the display panel;
A support member that supports a part of the lower side of the display panel from below,
Equipped with
The distance between the display panel and the portion of the second holding member corresponding to the first region corresponding to the part supported by the supporting member in the region along the lower side is the second holding member. The display device is characterized in that it is larger than the distance between the other part of the display panel and the display panel.

  According to the present invention, it is possible to prevent display unevenness from occurring when a display panel of a display device is warped.

Exploded perspective view schematically showing the whole display device of Example 1. Front view schematically showing the display device of Example 1. The AA sectional view of FIG. 2 which showed the display apparatus of Example 1 typically. The BB sectional view of FIG. 2 which showed the display apparatus of Example 1 typically. The front view which showed typically the display apparatus of Example 2. FIG. 5 is a cross-sectional view taken along the line AA of FIG. 5, which schematically shows the display device of Example 2. The front view which showed typically the display apparatus of Example 3. The figure which showed the arrangement structure of the front elastic body of the frame in the display apparatus of Example 4. FIG. 8 is a cross-sectional view taken along the line AA of FIG. 8 schematically showing the display device of Example 4. Sectional drawing similar to the AA cross section of FIG. 2 which showed the display apparatus of Example 5 typically. Front view showing an example of a state where display unevenness occurs in a conventional display device Front view schematically showing a conventional display device The AA sectional view of FIG. 12 which showed the conventional display apparatus typically. The relationship showing the force acting on the lower side of the display panel of Example 1. Relationship indicating the force acting on the lower side of the conventional display panel Relationship between the compression ratio of the front elastic body, the compression force of the front elastic body, and the pressing force on the display panel Relationship between the compressibility of the back elastic body, the compression force of the back elastic body, and the pressing force on the display panel The front view which showed typically the display apparatus of Example 6. 18 is a cross-sectional view taken along the line AA of FIG. 18, which schematically shows the display device of Example 6.

(Example 1)
Embodiment 1 of the present invention will be described below with reference to the drawings.
FIG. 1 is an exploded perspective view schematically showing the whole display device of the first embodiment. The display device 1 includes a frame 3, a display panel 2, a panel holder 4, optical sheets 51, a reflection sheet 52, a substrate 53, and a case 55. The display panel 2 is a liquid crystal panel, an organic EL panel, a MEMS (Micro Electro Mechanical Systems) panel, or the like. The frame 3 is a first holding member that holds the periphery of the display area of the display panel 2 from the front side. The frame 3 is made of metal, for example, and is formed by pressing or machining, but it may be formed by resin molding. The panel holder 4 is a second holding member that holds the periphery of the display area of the display panel 2 from the back side. The panel holder 4 is preferably resin-molded, but may be made of a metal material. The panel holder 4 holds and stores the display panel 2 so as to maintain a constant space between the display panel 2 and the optical sheets 51. The first holding member (frame 3) may be any member that holds a plurality of sides of the display panel from the front side. The second holding member (panel holder 4) may be any member that holds a plurality of sides of the display panel from the back side.

The optical sheets 51 in the backlight unit 5 diffuse the light from the back. The reflection sheet 52 reflects the light of the light source. A light source 54 such as an LED (Light Emitting Diode) or CCFL (Cold Cathode Fluorescent Lamp) is mounted on the substrate 53. The backlight system includes a direct type and an edge light type, but the present invention is applicable to any backlight type display device. The case 55 houses the optical sheets 51, the reflection sheet 52, and the substrate 53. The display unit 2 is illuminated by the backlight unit 5 configured by these components.

FIG. 2 is a front view schematically showing the display device of the first embodiment. FIG. 3 is a diagram schematically showing the display device of Example 1 with a sectional view taken along line AA of FIG. FIG. 4 is a diagram schematically showing the display device of Example 1 with reference to a sectional view taken along line BB of FIG.
As shown in FIG. 2, the panel holders 4 are arranged on the rear four sides of the display panel 2. The flexible wiring 20 and the drain substrate 21 are connected to the upper end of the display panel 2, and the display panel 2 is driven. A part of the lower end portion of the display panel 2 is supported from below by a panel support portion 140 that is configured integrally with the panel holder 4. In the first embodiment, the panel support 140 is arranged at two different positions along the lower side. The number of panel supports 140 is not limited to two. The panel support portion 140 is a support member that supports a part of the lower end portion of the display panel 2 from below and supports the display panel 2. The length of the panel support 140 along the lower side of the display panel 2 can be set according to the lower side length of the display panel 2, for example. Also, the length of the panel support 140 may be set in the range of 2 to 200 mm. Further, the panel support 140 may be made of a material having good slidability, for example, a resin material mixed with glass filler, or a sheet material having high slidability may be arranged by adding another material. As a result, it is possible to reduce the frictional force generated on the display panel 2 due to an external factor.

  A frame 3 (not shown) is arranged on the front surface of the display panel 2, and front elastic bodies are arranged on four sides of the frame 3. The front elastic body is a first cushioning member arranged between the front side of the display panel 2 and the frame 3 on the four sides of the display area of the display panel 2. In the panel holder 4, back elastic bodies for holding the display panel 2 are arranged in advance on four sides. The back elastic body is a second cushioning member arranged between the back side of the display panel 2 and the panel holder 4 on the four sides of the display area of the display panel 2. The first cushioning member may be arranged at least on one side of the lower end of the display panel between the front side of the display panel and the first holding member (frame 3). The second cushioning member may be arranged at least on one side of the lower end portion of the display panel between the back side of the display panel and the second holding member (panel holder 4). In the first embodiment, the case where the display panel, the first cushioning member, and the second cushioning member are quadrilaterals has been described as an example, but these shapes are not limited to quadrilaterals. For example, the shape may be polygonal or arcuate at the upper left and upper right corners.

It is desirable to use a flexible material for the back elastic body and the front elastic body so that the display panel 2 is not scratched or abutted. The thickness of the front elastic body can be set according to the clearance between the frame 3 and the display panel 2. The thickness of the front elastic body is preferably about 0.5 to 5 mm, and the width is preferably about 0.5 to 5 mm. The thickness of the back elastic body is also preferably about 0.5 to 5 mm, and the width is preferably about 0.5 to 5 mm. Further, the hardness of the back elastic body may be equal to or higher than the hardness of the front elastic body. This is to maintain a constant space between the display panel 2 and the optical sheets 51. The back elastic body is adhered to the panel holder 4, and the front elastic body is adhered to the frame 3. However, these may not be fixed by adhesion. The display panel 2 is held by the elastic force acting on the display panel 2 (elastic force on the display panel 2) when these elastic bodies are compressed. The calculation of the compression rate is shown below.

  In addition, as shown in FIGS. 2, 3, and 4, the first embodiment has a structure in which the back elastic body is not partially disposed near the panel support 140. The left rear elastic body 15, the right rear elastic body 16, and the upper rear elastic body 17 are uniformly arranged along the right side, the left side, and the upper side on the rear side of the display panel 2. On the other hand, the back elastic body on the lower side has the lower back elastic body-end portion 110 arranged at both ends and the lower back elastic body-center portion 111 arranged at the center, which are separated from each other and are arranged along the side. Is not arranged like. The length (separation length) along the side of the lower side where the lower back elastic body-end portion 110 and the lower back elastic body-center portion 111 are not provided depends on the length of the panel support portion 140. Can be set. The separation length of the lower back elastic body is preferably a length obtained by adding 0 to 100 mm to the length of the panel support 140 along the side.

  As shown in FIG. 3, when the display panel 2 is warped or an external force is applied, a frictional force 141 is generated in the vicinity of the panel support portion 140. The frictional force 141 depends on the frictional resistance between the display panel 2 and the panel support 140 and the weight of the display panel 2. Although there are various factors that cause warpage of the display panel 2, changes in the use environment (ambient temperature, humidity, etc.) and changes in temperature and humidity of the display panel 2 due to use time are generally mentioned. The warp direction, warp amount, and warp shape change depending on the thickness and size of the display panel 2, the characteristics and thickness of the polarizing plates attached to the front and back surfaces of the display panel 2, and the like.

  On the other hand, on the front surface side of the display panel 2, the front surface holding force 142 acts on the display panel 2 from the lower front elastic body 30 as an elastic force by compression, but from the rear surface side, the elastic force by compression does not act. As a result, the force acting on the display panel 2 from the front elastic body and the rear elastic body (force on the display panel 2) becomes smaller than the other portions in the vicinity of the panel support portion 140, so that the display panel 2 is not affected by the panel. Excessive stress concentration in the vicinity of the support 140 is suppressed. Therefore, local deformation of the display panel 2 is less likely to occur.

  Further, except for the vicinity of the panel support 140, the lower back elastic body-the end portion 110 and the lower rear elastic body-the central portion 111 are arranged, so that the front surface holding force 142 and the back surface holding force 143 act on the display panel 2. It becomes a state. As a result, the display panel 2 is held at an appropriate position. In the vicinity of the panel support portion 140, the display panel 2 easily moves to an appropriate position even if a panel warp occurs or an external force acts, so that the display panel 2 moves or warps particularly on the back side. It is effective when you do.

Hereinafter, these effects will be described using calculation formulas. In the following description, the width means the size in the direction substantially parallel to the display surface of the display panel 2 and perpendicular to each side (the size in the lateral direction of the front elastic body and the rear elastic body). The length represents the size in the direction parallel to the display surface of the display panel 2 and along each side (the size in the longitudinal direction of the front elastic body or the rear elastic body). The thickness means a size in a direction substantially perpendicular to the display surface of the display panel 2.

Assuming that the friction coefficient relating to the frictional force between the display panel 2 and the panel support 140 is μ and the vertical drag force according to the weight of the display panel 2 is N[N], the frictional force Fm generated in them is expressed by the following formula. It

Fm=μ×N[N]

The compression force (front surface) that the front elastic body on the lower side acts on the display panel 2 is Fp[N], and the compression force (back surface) that the rear elastic body on the lower side acts on the display panel 2 is Fr[N]. These are the forces that hold the display panel 2 from the front and back.
The compressive force (front surface) Fp is obtained based on the compressive stress P1 [MPa] obtained from the compressibility of the front elastic body, the width B1 [mm] of the front elastic body, and the length L [mm] of the front elastic body. Here, the length of the front elastic body is equal to the length in the panel X direction because the front elastic body is provided over the entire length in the panel lateral direction (hereinafter referred to as the X direction).
The compression force (back surface) Fr is based on the compressive stress P2 [MPa] obtained from the compression rate of the back surface elastic body, the width B2 [mm] of the back surface elastic body, and the length (L-2y) [mm] of the back surface elastic body. Desired. Here, the length of the portion near the panel support portion 140 where the back elastic body is not provided is y [mm]. The length of the back elastic body is set to the above length because the back elastic body is not provided in the vicinity of the panel supporting portion 140 at two places.

FIG. 16 shows an example of the relationship between the compression rate of the front elastic body and the compression force (pressing force (holding force) on the display panel) of the front elastic body. Curves A, B, and C respectively show the relationship between the compressibility and the compressive force corresponding to various materials of the elastic member.
FIG. 17 shows an example of the relationship between the compression rate of the back elastic body and the compression force of the back elastic body (pressing force (holding force) on the display panel). Curves D, E, and F respectively show the relationship between the compressibility and the compressive force corresponding to various materials of the elastic member.
As shown in FIGS. 16 and 17, the compressive stress P1 [MPa] obtained from the compressibility of the front elastic body and the compressive stress P2 [MPa] obtained from the compressibility of the rear elastic body depend on the material and thickness of the elastic member. different.

The compressive force (front) Fp and the compressive force (rear) Fr are calculated by the following formulas.

Fp=P1×B1×L[N]
Fr=P2×B2×(L-2y)[N]

The length x [mm] of the panel support 140 is a [mm] when the length in the X direction from the panel support 140 to the lower back elastic body-end portion 110 and the lower back elastic body-central portion 111 is a [mm]. It is expressed by the following formula.

y=x+2a [mm]

The force acting on the lower side of the display panel 2 is converted into the force per unit length. Friction force per unit length is Fmt, compression force per unit length (front surface) is Fpt, compression force per unit length (
When the back surface is Frt, they are represented by the following equations.

Fmt=Fm/2x[N]
Fpt=Fp/L[N]
Frt=Fr/(L-2y) [N]

As the total (Fmt+Fpt+Frt) shows a constant value at each position in the X direction of the display panel 2, excessive stress concentration on the display panel 2 is suppressed when the display panel 2 is warped or an external force is applied.

A more specific configuration example of the display device according to the first embodiment will be described.
The panel holder 4 was formed by resin molding, PC (polycarbonate) was used as the material, and glass filler 10% was further mixed. For the frame 3, a material SECC (electrogalvanized steel sheet) formed by press die molding and having a thickness of 1 mm was adopted. The clearance between the frame 3 and the display panel 2 (distance in the direction perpendicular to the display surface of the display panel 2) was 2.1 mm. As the front elastic body, a flexible foam cushion material was adopted, and the thickness of the front elastic body on each side was 3 mm and the width was B1=3 mm. The front elastic body was fixed to the frame 3 by sticking it with double-sided tape. Thereby, the compression rate of the front elastic body was set to 30%. A rubber cushion was used as the back elastic body, and the back surface elastic body was attached and fixed to the four sides of the panel holder 4 with double-sided tape.

  The clearance between the panel holder 4 and the display panel 2 was 2.7 mm, the thickness was 3 mm, and the width was B2=3 mm. As a result, the compressibility of the back elastic body was set to 10%. Further, the panel supporting portion 140 is arranged at two places along the lower side of the display panel 2, and the length of one place is x=30 mm. The length of the lower side of the panel is L=500 mm. As described above, the back elastic body is not arranged near the panel support 140. The length of the lower back elastic body-central part 111 is 300 mm, the length of the lower back elastic body-end 110 is 50 mm at one end, and the lower back elastic body-end 110 and the lower back elastic body-central part 111 are The separation length of was set to y=50 mm by adding a=10 mm to the left and right of the panel support 140. The physical property values and shapes of the front elastic body and the rear elastic body, and the length of the panel supporting portion 140 along the lower side of the display panel 2 depend on the characteristics of the warp that occurs in the display panel 2 due to changes in the usage environment of the display device. It is set based on.

When the weight of the display panel 2 is 0.6 kg, the normal force is N=5.88N. Assuming that the friction coefficient relating to the frictional force acting on the display panel 2 and the panel support 140 is μ=0.3, the frictional force is approximately Fm=1.764N.
When the material of the front elastic body is the material A shown in FIG. 16, the compressive stress is P1=0.002 MPa because the compression rate of the front elastic body is 30%. When the material of the back elastic body is the material D shown in FIG. 17, the compressive stress is P2=0.01 MPa because the compressibility of the back elastic body is 10%. From the above, the compression force (front surface) is approximately Fp=3N, and the compression force (back surface) is approximately Fr=12N.

  From the above, when converted into force per unit length, the friction force per unit length is approximately Fmt=0.0294 [N/mm], and the compression force per unit length (front surface) is approximately Fpt=0.006. It was [N/mm]. The compression force per unit length (back surface) was approximately Frt=0.03 [N/mm]. It should be noted that the region on which Fmt acts is only the portion where the support portion is arranged, and the region where Frt acts is only the portion where the back elastic body is arranged.

FIG. 14 is a diagram showing forces acting on respective positions on the lower side of the display panel 2 of Example 1 under the above conditions. FIG. 15 is a diagram showing an example of a force acting on each position on the lower side of the conventional display panel. As shown in FIG. 14, the distribution of the force (Fmt+Fpt+Frt) acting on each position on the lower side of the display panel 2 is substantially uniform in the X direction. On the other hand, as shown in FIG. 15, in the conventional display panel, when the back elastic body is also provided in the vicinity of the panel supporting portion, the force acting on the display panel in the vicinity of the panel supporting portion becomes large and the distribution is not uniform. There is. In the first embodiment, it is possible to make the forces acting on the display panel more uniform by appropriately selecting each parameter such as B1, L, P1, P2.

  With the configuration of the first embodiment, even when the display panel of the display device is warped or an external force is applied, the elastic force from the back elastic body does not act in the vicinity of the panel support portion, so that the display panel is not affected. The generated stress is relieved, and display unevenness can be reduced. The configuration of the first embodiment is particularly suitable for application to the case where the display panel moves toward the back side or warps occur.

(Example 2)
A second embodiment will be described with reference to the drawings. The second embodiment differs from the first embodiment in the configuration of the back elastic body. Differences from the first embodiment will be described in detail.
FIG. 5 is a front view schematically showing the display device according to the second embodiment. FIG. 6 is a cross-sectional view taken along the line AA of FIG. 5, which schematically shows the display device of the second embodiment.

  As shown in FIGS. 5 and 6, the second embodiment has a structure in which the volume of the back elastic body is partially reduced in the vicinity of the panel support portion 240. In order to reduce the volume, the lower back elastic body includes a lower back elastic body-end portion 210 arranged at both ends, a lower rear back elastic body-center portion 211 arranged in the center, and a panel support therebetween. The lower back elastic body-supporting portion 212 arranged near the portion 240. The lower back elastic body-supporting portion 212 has a width (parallel to the panel display surface and a size in the lateral direction of the back elastic body) as compared with the lower back elastic body-end portion 210 and the lower back elastic body-center portion 211. ) Was reduced. As a result, the area in which the back elastic body contacts the plane parallel to the plane direction of the display panel 2 becomes small, and the volume of the back elastic body also decreases. A preferable setting value of the width of the lower rear elastic body-supporting portion 212 changes depending on the relationship between the frictional force 241, the front surface holding force 242, the back surface holding force 243 and the stress generated in the display panel 2 and the like. For example, the width of the lower back elastic body-supporting portion 212 is preferably about 1/2 to 1/10 of the width of the lower back elastic body-center portion 211.

  Further, the length of the lower back elastic body-supporting portion 212 depends on the length of the panel supporting portion 240, but for example, a length obtained by adding 0 to 100 mm to the length of the panel supporting portion 240 is desirable. As an example, when the length of the panel support 240 is 30 mm, the length of the lower back elastic body-support 212 may be 50 mm, which is 10 mm larger than the length of the panel support 240 by 10 mm to the left and right. Further, when the width of the other back elastic body is 3 mm, the width of the lower back elastic body-support portion 212 may be set to 1 mm, for example.

  In addition, as a method for making the volume of the lower back elastic body-supporting portion 212 smaller than the other portions, the thickness of the lower back elastic body-supporting portion 212 is set to the lower back elastic body-the end portion 210 or the lower back elastic body-. It is also effective to make the thickness smaller than the thickness of the central portion 211. By reducing the thickness, the compressibility of the elastic body decreases. It is preferable that the compression ratio of the lower back elastic body-support portion 212 is about 1/2 to 1/10 of that of the other portions. As a result, the back surface holding force 243 is reduced in the vicinity of the panel support portion 240, so that excessive stress concentration is suppressed from occurring in the panel support portion, and local deformation of the display panel 2 is less likely to occur.

  According to the configuration of the second embodiment, even when the back elastic body is arranged in the vicinity of the panel support portion, the back holding force acting on the display panel is reduced when the display panel is warped or an external force is applied. The generated stress is relieved, and display unevenness can be reduced.

(Example 3)
Next, a third embodiment will be described with reference to the drawings. The third embodiment differs from the first and second embodiments in the configuration of the back elastic body.
FIG. 7 is a front view schematically showing the display device according to the third embodiment.
As shown in FIG. 7, the third embodiment has a structure in which the material of the back elastic body is partially changed in the vicinity of the panel support portion 340. Particularly, the elastic modulus and hardness of the back elastic body are changed in the vicinity of the panel support portion 340 with respect to other portions. Similar to the second embodiment, the lower back elastic body includes the lower back elastic body-end portion 310 arranged at both ends, the lower back elastic body-center portion 311 arranged at the center, and the panel support portion 340 therebetween. It is composed of a lower back elastic body and a supporting portion 312 arranged in the vicinity. The materials of the lower back elastic body-end portion 310 and the lower back elastic body-central portion 311 are the same, but the materials of the lower back elastic body-supporting portion 312 are different. For example, the elastic modulus and the hardness of the lower back elastic body-supporting portion 312 are preferably about 1/2 to 1/10 of the lower back elastic body-central portion 311. As a result, the elastic force acting on the display panel 2 from the back elastic body near the panel support portion 340 is reduced. Therefore, even if the display panel 2 is warped or an external force is applied, excessive stress concentration is suppressed from occurring in the panel support portion, and local deformation of the display panel 2 is less likely to occur.

  According to the configuration of the third embodiment, the rear surface holding force acting on the display panel is reduced when the display panel is warped or an external force is applied even when the rear elastic body is arranged in the vicinity of the panel support portion. The generated stress is relieved, and display unevenness can be reduced.

(Example 4)
Next, a fourth embodiment will be described with reference to the drawings. The fourth embodiment differs from the first embodiment in the configuration of the front elastic body.
FIG. 8 is a diagram showing the arrangement structure of the front elastic body of the frame in the display device of the fourth embodiment. FIG. 9 is a cross-sectional view taken along the line AA of FIG. 8 schematically showing the display device of Example 4. Note that FIG. 8 is a view as viewed from the back side of the frame.

  As shown in FIGS. 8 and 9, the fourth embodiment has a structure in which the front elastic body is not partially arranged in the vicinity of the panel support portion 440. The front elastic body fixed to the frame 3 includes a left side front elastic body 35, a right side front elastic body 36, and an upper side front elastic body 37. The lower-side front elastic body is composed of a lower-side front elastic body-end portion 430 arranged at both ends and a lower-side front elastic body-central portion 431 arranged at the center, and arranged separately from each other. The separation length of the lower front elastic body-end portion 430 and the lower front elastic body-central portion 431 depends on the length of the panel support portion 440. The separation length of the lower side front elastic body-end portion 430 and the lower side front elastic body-center portion 431 is preferably, for example, a length obtained by adding 0 to 100 mm to the length of the panel support portion 440. When the display panel is warped or an external force is applied, the frictional force 441 and the rear surface holding force 443 act in the vicinity of the panel support portion 440, but the elastic force by the front elastic body does not act from the front surface side. As described above, by preventing the elastic force of the front elastic body from being generated in the vicinity of the panel support portion 440, it is possible to suppress excessive stress concentration from being generated in the panel support portion, and it is difficult for the display panel to be locally deformed.

  According to the configuration of the fourth embodiment, even when the display panel is warped or an external force is applied, the elastic force of the front elastic body does not act near the panel support portion, and the stress generated in the display panel is relieved. Therefore, display unevenness can be reduced. The configuration of the fourth embodiment is particularly suitable for application when the display panel moves or warps in the front direction.

(Example 5)
Next, a fifth embodiment will be described with reference to the drawings.
FIG. 10 is a sectional view schematically showing the display device of the fifth embodiment. The position of the cross section is the position where the panel support portion 540 is located, as in the AA cross section of FIG.

As shown in FIG. 10, in Example 5, neither the front elastic body nor the back elastic body is arranged near the panel support portion 540. Accordingly, when the display panel 2 is warped or an external force is applied, only the frictional force 541 is generated, and the elastic force of the elastic body does not act from the back side and the front side of the display panel 2. As a result, even when the display panel is warped or an external force is applied, excessive stress concentration on the display panel 2 is suppressed in the vicinity of the panel support portion, and local deformation of the display panel 2 is less likely to occur. Further, since the front elastic body and the rear elastic body are arranged at a position other than the vicinity of the panel support portion 540, the front surface holding force and the back surface holding force act on the display panel 2 and the display panel 2 is held at an appropriate position. It

  According to the configuration of the fifth embodiment, even when the display panel of the display device is warped or an external force is applied, the elastic force does not act on the panel support portion in the vicinity of the front side and the back side. The stress generated in the display is alleviated, and display unevenness can be reduced. The configuration of the fifth embodiment is suitable for application when the display panel moves or warps on both the front side and the back side.

(Example 6)
Next, a sixth embodiment will be described with reference to the drawings.
FIG. 18 is a front view schematically showing the display device of Example 6. FIG. 19 is a sectional view taken along line AA of FIG. 18, which schematically shows the display device of Example 6.

  As shown in FIGS. 18 and 19, in the sixth embodiment, the back elastic bodies 610 and 612 are continuously formed. On the other hand, at a position near the panel support portion 640, a part of the panel holder 604 is formed such that the distance from the display panel 2 is longer than that at other positions. As a result, at this portion, the back elastic body 612 is prevented from coming into contact with the display panel 2, so that the holding force of the back elastic body on the display panel 2 is suppressed, and the front surface of the display panel 2 is suppressed. Only the holding force 642 and the friction force 641 act. The distance between the panel holder 604 and the display panel 4 at this portion is set so that the back elastic body 612 does not contact the display panel 4. Specifically, it depends on the thickness of the back elastic body 612, but is preferably about 1 to 5 mm. .. Since the front elastic body and the rear elastic body are arranged so as to contact the display panel 2 at positions other than the vicinity of the panel support portion 640, the front holding force and the rear holding force act on the display panel 2 and the display panel 2 Is held in place.

  In the configuration of the sixth embodiment, the back elastic body can be formed without being separated, and the panel holder can be integrally formed, so that an increase in the number of assembly steps and the number of parts can be suppressed. Further, even when the display panel of the display device is warped or an external force is applied, the stress generated in the display panel is relaxed, and the effect of reducing display unevenness can be obtained as in the other embodiments.

  As described above, according to the present invention, even when the display panel of the display device is warped or an external force is applied, the forces acting on the display panel from the front elastic body and the rear elastic body are different from each other near the panel support portion. Is smaller than the part. Therefore, it is possible to suppress the occurrence of a large stress on the display panel in the vicinity of the panel support portion, and it is possible to reduce display unevenness.

1: Display device, 2: Display panel, 3: Frame, 4: Panel holder, 30: Lower side front elastic body, 110: Lower side rear elastic body-end portion, 111: Lower side rear elastic body-center portion, 140: Panel support Department

Claims (13)

Display panel,
A first holding member for holding a plurality of sides of the display panel from the front side;
A first cushioning member arranged between a front surface of a region along a lower side of the plurality of sides of the display panel and the first holding member;
A second holding member for holding the display panel from the back side;
A second cushioning member disposed between the second holding member and a back surface of a region along the lower side of the display panel;
A support member that supports a part of the lower side of the display panel from below,
Equipped with
Of the region along the lower side, the force applied from the first cushioning member to the first region corresponding to the part supported by the support member, and the second region to the first region. The total of the force exerted by the cushioning member is the force exerted by the first cushioning member on the second region different from the first region in the region along the lower side, and the second force on the second region. The display device is characterized in that it is smaller than the sum of the force applied from the cushioning member and   The display device according to claim 1, wherein the first region is a region in the vicinity of the part supported by the support member, of the region along the lower side of the display panel. The display device according to claim 1, wherein the second region is a region corresponding to a portion of the region along the lower side of the display panel that is not supported from below by the support member.   The thickness of at least one portion of the first cushioning member and the second cushioning member corresponding to the first region has a thickness in a direction substantially perpendicular to the display surface of the display panel smaller than other portions. The display device according to any one of claims 1 to 3. The width of at least one portion of the first cushioning member and the second cushioning member corresponding to the first region has a width in a direction substantially parallel to the display surface of the display panel smaller than other portions. The display device according to any one of claims 1 to 3.   At least one part of the said 1st buffer member and the said 2nd buffer member corresponding to the said 1st area|region is comprised using the material whose hardness is smaller than another part. The display device according to item 1.   The distance between a portion of the second holding member corresponding to the first region and the display panel is larger than the distance between another portion of the second holding member and the display panel. The display device according to any one of 3 above.   The display device according to claim 1, wherein at least one of the first buffer member and the second buffer member is made of an elastic body.   The display device according to claim 1, wherein the support member is in contact with and supports the lower end portion of the display panel.   The physical property values and shapes of the first cushioning member and the second cushioning member, and the length of the supporting member along the lower side of the display panel are generated in the display panel due to changes in the usage environment of the display device. The display device according to claim 1, wherein the display device is set based on a characteristic of warpage. Display panel,
A first holding member for holding the display panel from the front side;
A first cushioning member disposed between the first holding member and the front surface of the region along the lower side of the display panel;
A second holding member for holding the display panel from the back side;
A plurality of second cushioning members arranged between the second holding member and a back surface of a region along the lower side of the display panel;
A support member for supporting a part of the display panel from below,
A Ru display device comprising a,
The plurality of second cushioning members are arranged so that a space is provided at least at a position corresponding to a portion of the display panel supported by the central portion of the support member when viewed from the front side of the display device. A display device characterized by the above. Display panel,
A first holding member for holding a plurality of sides of the display panel from the front side;
A first cushioning member arranged between a front surface of a region along a lower side of the plurality of sides of the display panel and the first holding member;
A second holding member for holding the display panel from the back side;
A second cushioning member disposed between the second holding member and a back surface of a region along the lower side of the display panel;
A support member that supports a part of the lower side of the display panel from below,
Equipped with
At least one portion of the first cushioning member and the second cushioning member corresponding to the first region corresponding to the part supported by the supporting member in the region along the lower side is on the lower side. The display device is smaller than at least one portion of the first cushioning member and the second cushioning member corresponding to a second region different from the first region in the region along the line. Display panel,
A first holding member for holding a plurality of sides of the display panel from the front side;
A first cushioning member arranged between a front surface of a region along a lower side of the plurality of sides of the display panel and the first holding member;
A second holding member for holding the display panel from the back side;
A second cushioning member disposed between the second holding member and a back surface of a region along the lower side of the display panel;
A support member that supports a part of the lower side of the display panel from below,
Equipped with
The distance between the display panel and the portion of the second holding member corresponding to the first region corresponding to the part supported by the supporting member in the region along the lower side is the second holding member. A display device, which is larger than a distance between the other part of the display panel and the display panel.