JP2017187711A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device using a display panel capable of satisfying both of suppression of display unevenness and reduction of thickness.SOLUTION: The display device includes: a panel unit that has a display panel for displaying images based on image data and a transparent panel which is fixed to the front side or rear side of the display panel; and a holding member that holds the panel unit by supporting the edge faces of the transparent panel. The holding member supports the transparent panel in contact with at least a part of the rear lower plane in a vertical direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a display device.

  A display device used for a screen of a television or a computer includes a backlight, a display panel illuminated by the backlight, an electric circuit, a structure portion that holds and supports them, and an exterior member. In recent years, in the field of such display devices, there is an increasing demand for thinning, large screens, and high definition. FIG. 12 is a longitudinal sectional view showing a schematic structure of a conventional liquid crystal display device. The display 100 includes a panel 101, a frame 102 that covers the front and side surfaces of the panel 101 in a frame shape, and a holder 103 that covers the back and side surfaces of the panel 101 in a frame shape and supports the lower end of the panel 101. The front elastic body 104 is an elastic component disposed along the front of the lower side of the panel 101 and is fixed to the inner wall of the frame 102. The back elastic body 105 is an elastic part arranged in a frame shape on the back side of the panel 101, and is fixed to a vertical surface 109 (a surface parallel to the display surface of the panel 101) of the holder 103. A part 108 of the holder 103 that is parallel to the lower end surface of the panel 101 is provided with a support 107 that contacts the lower end surface of the panel 101 and supports the lower end surface, in part or in whole along the lower side of the panel 101. The front elastic body 104 always urges the panel 101 in the direction of the backlight 106, and the back elastic body 105 softly sandwiches the panel 101 from the back side. The backlight 106 is a lighting device arranged on the back side of the panel 101. The display 100 displays an image based on the image signal by adjusting the transmittance of the light emitted from the backlight 106 with the aperture ratio of the liquid crystal shutter constituting the panel 101.

  The panel 101 is composed of two glass plates filled with liquid crystal, a polarizing film (polarizing plate) having a vertical stretching direction on the surface of the glass plate on the backlight 106 side, and a stretching direction on the front observer side. A horizontal polarizing film is attached. The polarizing film is manufactured by uniaxially stretching a polyvinyl alcohol film, has a shrinkage stress, absorbs moisture when the surrounding humidity is high, and stretches when the humidity is low, and releases moisture and shrinks when the humidity is low . The panel 101 to which the polarizing film having a stretching direction different by 90 ° is attached has a complicated shape due to stretching or shrinkage of the polarizing film on the back side and the front side due to the influence of the surrounding humidity. When the panel 101 is bent, the operation of the internal liquid crystal is affected. For example, the shutter may be opened and closed without receiving an electric field, and light may be transmitted in a state where the shutter must be closed. This causes a decrease in image quality such as display unevenness. Further, when the panel 101 moves rearward due to external pressure or vibration during conveyance, stress may be generated inside the panel 101 due to pressure received from the back elastic body 105, and black display unevenness may occur. Further, it is necessary to secure a space for allowing the panel 101 to warp and an arrangement space for the positioning elastic body 104 and the back elastic body 105, which hinders thinning.

JP 2010-204357 A International Publication No. 2008/093704

Patent Document 1 proposes a liquid crystal panel support structure for suppressing display unevenness. FIG. 13 is a longitudinal sectional view of a liquid crystal panel support structure proposed in Patent Document 1. In FIG. The support frame 121 is a resin member that supports the liquid crystal panel 120 below. Support frame 121
Has a horizontal surface 122 on the front side (observer side), an inclined surface 123 on the rear side thereof, and a vertical surface 125 continuous therewith. An elastic body 124 is provided on the vertical surface 125 and is provided along the four sides of the liquid crystal panel 120 to define the position of the back side of the liquid crystal panel 120. Even if the liquid crystal panel 120 moves rearward due to external pressure or vibration during conveyance and the inclined surface 123 supports the ridgeline of the liquid crystal panel 120 as shown in FIG. 13, the liquid crystal panel 120 moves the inclined surface forward. It slides and moves, and the horizontal surface 122 supports the lower end of the liquid crystal panel 120. Therefore, it can be said that the elastic body 124 remains pressed against the back side of the liquid crystal panel 120 and the occurrence of stress on the liquid crystal panel 120 can be suppressed. However, in general, the glass substrate constituting the liquid crystal panel is manufactured by a scribing process for cutting the mother glass into a desired shape. Therefore, the ridgeline of the liquid crystal panel 120 has irregularities and is caught on the inclined surface 123, and the stress is not relieved. In some cases, display unevenness occurred.

  Patent Document 2 proposes a structure for preventing deflection of a liquid crystal panel against a static pressure load. FIG. 14 is a longitudinal sectional view of the structure of the liquid crystal panel proposed in Patent Document 2. In FIG. The panel 110 has a structure in which a liquid crystal is sandwiched between two glass substrates, and an upper polarizing plate 111 and a lower polarizing plate 112 are attached to the surface. Tempered glass 113 and 114 are attached to both sides of panel 110 using adhesives 115 and 116. The tempered glass 113 and 114 suppresses the deflection of the panel 111 when receiving static pressure from the outside. However, since there are tempered glasses 113 and 114 that are thicker than the panel 110, it becomes an obstacle to thinning.

  An object of the present invention is to achieve both suppression of display unevenness and reduction in thickness in a display device using a display panel.

The present invention provides a display panel for displaying an image based on image data;
A transparent panel fixed to the front or back of the display panel;
A panel unit having
A holding member for holding the panel unit by supporting an end surface of the transparent panel;
With
The said holding member is a display apparatus characterized by contacting and supporting at least one part among the end surfaces which are the lower sides in the perpendicular direction among the said transparent panels.

The present invention provides a display panel for displaying an image based on image data;
A transparent panel fixed to the back of the display panel;
A panel unit having
An illumination device for irradiating the panel unit with light from the back side;
With
A first frame-like member composed of a surface parallel to the display surface of the panel unit is formed in the peripheral portion on the front side of the lighting device,
The panel unit is a display device that is fixed to the lighting device by fixing a peripheral portion of the transparent panel to the first frame member.

The present invention provides a display panel for displaying an image based on image data;
A transparent panel fixed to the back of the display panel;
A second frame-like member fixed to the transparent panel so as to cover the peripheral edge of the transparent panel from the back side;
A panel unit having
An illumination device for irradiating the panel unit with light from the back side;
With
The panel unit is a display device that is fixed to the lighting device by fixing the second frame member to the lighting device.

  According to the present invention, it is possible to achieve both suppression of display unevenness and thickness reduction in a display device using a display panel.

Sectional drawing of the display apparatus of Example 1 Sectional drawing of the display apparatus of Example 2. Front view of the display device of Example 2 Sectional drawing of the display apparatus of Example 3 Front view of the display device of Example 3 Sectional drawing of the principal part of the display apparatus of Example 3. Sectional drawing of the principal part of the display apparatus of Example 3, and the display apparatus of a prior art Sectional drawing of the display apparatus of Example 4 Sectional drawing of the principal part of the display apparatus of Example 4. Front view of the display device of Example 4 Sectional drawing of the display apparatus of Example 4 Sectional view of a prior art display device Sectional view of the main part of a display device of the prior art Sectional view of the main part of a display device of the prior art

Example 1
FIG. 1 is a longitudinal sectional view showing a schematic structure of a display device according to Embodiment 1 of the present invention. The display device 1 is a display device using liquid crystal, and has a backlight, a liquid crystal panel, and an electric circuit that outputs an image signal, which will be described later.

  The panel 2 is a display panel that displays an image based on image data, and has a configuration in which a rectangular glass substrate on the front side and a rectangular glass substrate on the back side are bonded together. The glass substrate on the front side has a color filter formed on one side, and an upper polarizing plate is attached to the surface on the viewer side. The glass substrate on the back side has electric wiring formed on one side, and a lower polarizing plate is attached to the surface opposite to the viewer side. The panel 2 is configured by facing these two glass substrates and enclosing liquid crystal between these glass substrates and sealing the periphery. An electric cable 3 described later is connected to the terminal portion of the panel 2. The panel 2 is not limited to the liquid crystal panel described above. A MEMS (Micro Electro Mechanical Systems) shutter type display panel may be used, or an organic EL (Electro-Luminescence) panel may be used. When the organic EL panel is used, the backlight described later is unnecessary, but other configurations can be the same as those in the first embodiment, and the same effects as those in the first embodiment can be obtained.

The electric cable 3 is FPC (Flexible Printed Circuits) that electrically connects a terminal portion of the panel 2 and a drive board 4 described later, and an IC is mounted near the center.
The drive substrate 4 is an electric circuit for supplying an image signal and electric power to the panel 2 and includes a printed wiring and an electric element.
The control board 5 is electrically connected to the drive board 4 via an FFC (Flexible Flat Cable), and supplies an image signal and power to the drive board 4. The control board 5 is fixed to the back surface of the case 15 with screws.

The front plate 6 is a rectangular transparent panel configured by a blue glass substrate having a thickness of 1.1 mm disposed on the front side of the panel 2. The front plate 6 is manufactured by cutting the mother glass into a rectangle, chamfering the ridgeline of the cut surface, and further polishing the cut surface. An AR (Anti Reflection) film is affixed to the surface of the front plate 6 on the viewer side, and the reflection of external light is 0.5%.
The image quality is improved.

  The adhesive 7 is a member for fixing the front plate 6 to the panel 2. The adhesive 7 is disposed between the surface of the upper polarizing plate on the front side of the panel 2 and the back side of the front plate 6, and is in close contact with the surfaces of the panel 2 and the front plate 6. The adhesive 7 is an ultraviolet curable resin, and is colorless and transparent and has an optical characteristic equivalent to that of a general glass material with a refractive index of 1.50 to 1.52 in order to suppress the influence on the display quality of an image. It is a transparent resin. The adhesive 7 is not limited to an ultraviolet curable resin. For example, the adhesive 7 may be a heat curing type. The adhesive 7 can be an acrylic or silicon resin.

  The panel holder 8 is a resin frame member that sandwiches a panel unit 21 (a unit in which the panel 2 and the front plate 6 are integrally formed with the adhesive 7) between the panel holder 8 and the frame 11. The panel holder 8 supports the back side of the panel unit 21 (the back side of the panel 2) via the elastic body 12 by the back support part 9 which is a part of the panel holder 8. The panel holder 8 is a holding member that holds the panel unit 21 by supporting the top, bottom, left, and right end surfaces of the front plate 6 by the end surface support portion 10. The panel holder 8 is manufactured by processing a thermoplastic resin into a desired shape by injection molding. The panel holder 8 is fixed to a case 15 described later with screws. At least a portion of the panel holder 8 that contacts the front plate 6 or all of the portions of the panel holder 8 is made of a material having a lower hardness than the front plate 6. Here, the configuration in which the panel holder 8 supports the top, bottom, left, and right end surfaces of the front plate 6 is illustrated. However, the panel holder 8 is configured to hold the panel unit 21 by supporting the end surface along the lower side of the front plate 6. What should I do? The present invention can also be applied to the case where the panel 2 and the front plate 6 are not rectangular. In that case, the panel holder 8 is in contact with at least a part of the end surface on the lower side in the vertical direction of the front plate 6. Any structure that supports the front plate 6 may be used.

The back support portion 9 is a rear portion of the panel holder 8, and is a frame-shaped portion configured by a surface parallel to the display surface of the panel unit 21 that covers the peripheral edge of the panel unit 21 from the back side. . The back support portion 9 performs positioning on the front side of an optical sheet 19 described later and positioning on the back side of the panel 2. The back support 9 is configured integrally with the panel holder 8.
The end surface support portion 10 is a front portion of the panel holder 8 and is a frame-shaped portion constituted by a surface perpendicular to the panel 2. The end surface support portion 10 surrounds and supports the upper, lower, left and right end surfaces of the front plate 6 in a frame shape.

  The frame 11 is a frame-shaped member that covers the four sides of the peripheral portion of the front plate 6 from the front side, and is produced by processing a steel plate to provide an opening. The frame 11 is fixed to the panel holder 8 with screws. Thereby, the dimension of the accommodation space of the panel 2 and the front plate 6 constituted by the frame 11 and the panel holder 8 becomes constant, and the display device 1 can be stably manufactured.

  The elastic body 12 is a second buffer member disposed between the back side of the peripheral edge of the panel unit 21 and the front side of the back support 9, and is disposed along the four sides on the back side of the panel 2. The The elastic body 12 has elasticity and is a frame-like member, and is fixed by sticking a foamable material to the back support portion 9 with a double-sided tape. Note that the elastic body 12 does not have to have a frame shape. The structure provided only in the one part area | region along each side may be sufficient.

The elastic body 13 is a first buffer member arranged between the back side of the frame 11 and the front side of the peripheral edge of the panel unit 21, and is arranged along the four sides on the front side of the front plate 6. . The elastic body 13 has flexibility and is a frame-like member, and is fixed by sticking a silicon foam rubber sheet to the back side of the frame 11 along the four sides of the opening with a double-sided tape. The elastic body 13 does not have to have a frame shape. The structure provided only in the one part area | region along each side may be sufficient. Since the front plate 6 and the panel 2 are positioned in the front-rear direction so that the frame-like elastic bodies 12 and 13 face each other, damage to the front plate 6 and the panel 2 that are glass materials is suppressed.

The backlight 14 is an illumination device that illuminates the panel 2 from the back. The backlight 14 is configured by housing a light source, a reflection unit, and optical sheets 19 in a case 15 described later.
The case 15 accommodates main components of the backlight 14. The case 15 is produced by forming a steel plate into a desired shape by press working. A control board 5 is mounted on the back surface of the case 15.
The optical sheet support 16 is a frame-like member that protrudes perpendicularly from the inner wall surface of the case 15 and supports optical sheets 19 described later.
The flange 17 is a member that protrudes around the case 15 and has a surface parallel to the panel 2. The flange 17 is used for fixing the display device 1 to the exterior casing.
The light emitting space 18 is a space inside the case 15 and includes a light source substrate, a reflection sheet, and a light source. The volume of the light emitting space 18 affects the uniformity of the light beam irradiated forward.
The optical sheets 19 have a configuration in which different types of optical sheets are laminated, and are composed of a diffusion plate, a diffusion film, a prism sheet, a diffusion film, and a polarization reflection sheet from the light source side.

Next, features of the display device 1 according to the first embodiment will be described.
The first characteristic point of the display device 1 of Example 1 is that the front plate 6 is attached to the front side of the panel 2 with the adhesive 7.
In the first embodiment, the thickness of the front plate 6 is 1.1 mm, and the thickness of each of the two glass substrates constituting the panel 2 is 0.7 mm. By attaching the front plate 6 to the panel 2 with the adhesive 7, the thickness of the panel unit 21 is
0.7mm × 2 + 1.1mm = 2.5mm
It becomes. The amount of deformation due to environmental conditions (deformation due to moisture absorption) of the polarizing plate attached to the panel 2 is such that the configuration having the front plate 6 is compared with the configuration not having the front plate 6.
(1.4 mm / 2.5 mm) ² = 0.31
Thus, the amount of deformation is theoretically suppressed to about 31%. Therefore, compared with the case where the panel 2 is used alone, when the panel unit 21 in which the front plate 6 is attached to the panel 2 is used, the strength against deformation (warpage) due to moisture absorption of the polarizing plate is increased, and the deformation of the panel 2 is increased. This can be reduced and display unevenness is improved. The thickness of the front plate 6 and the thickness of the glass substrate are examples, and are not limited to the above examples. If the front plate 6 is made thicker, the deformation of the panel 2 can be further suppressed, and the display unevenness can be further suppressed.

The second characteristic point of the display device 1 according to the first embodiment is a support structure for the panel unit 21 in which the front plate 6 is supported by the panel holder 8.
In the first embodiment, the end surface of the front plate 6 is polished, and the end surface support portion 10 of the panel holder 8 comes into contact with the end surface of the front plate 6 to support the front plate 6, so that it is integrated with the front plate 6. It was set as the support structure of the comprised panel 2. FIG. Therefore, even if the panel unit 21 moves rearward due to external pressure or vibration during conveyance, the end surface is polished as compared with the case where the end surface of the panel 2 is supported by the panel holder 8 as in the prior art. The front plate 6 is not easily caught on the surface of the panel holder 8. Accordingly, the panel unit 21 easily moves forward by the urging force (repulsive force) of the elastic body 12 and returns to an appropriate position. Therefore, generation of internal stress in the panel 2 can be suppressed. This suppresses display unevenness. Here, all the end surfaces of the front plate 6 are polished. However, at least a portion of the end surface of the front plate 6 supported by the panel holder 8 is subjected to a treatment for reducing friction more than other portions. It only has to be done.

(Example 2)
FIG. 2 is a longitudinal sectional view showing a schematic configuration of a display device according to Embodiment 2 of the present invention. FIG. 3 is a plan view of the display device of Example 2 as viewed from the observer side. The second embodiment will be described with reference to these drawings, but the description of the same arrangement, the same configuration, and the same functions as those of the first embodiment will be omitted.

  The display device 20 is a display device using liquid crystal as in the first embodiment, and includes a panel 2 in which polarizing plates are attached to both surfaces of two glass substrates in which liquid crystal is sealed. The display device 20 according to the second embodiment has a mechanism capable of rotating the panel unit 21 around an axis perpendicular to the screen, and is rotated 90 degrees clockwise as viewed from the observer side with respect to a normal horizontal position (horizontal display). It can be rotated to a vertical position (portrait display). The right side when viewed from the observer side in the horizontal position is the lower side in the vertical position. Moreover, it can be rotated 90 degrees counterclockwise from the vertical position to the horizontal position.

  The panel holder 31 is a resin frame member for sandwiching the panel unit 21 (a unit in which the panel 2 and the front plate 6 are integrally formed with the adhesive 7) between the panel holder 31 and the frame 11. The panel holder 31 is manufactured by processing a thermoplastic resin into a desired shape by injection molding.

  The end surface support portion 32 is a portion that contacts and supports the lower end surface of the front plate 6 and a portion that contacts and supports the right end surface when viewed from the viewer side of the front plate 6. Are formed on a surface parallel to the bottom surface (long side on the bottom surface side) and a surface parallel to the right end of the front plate 6 (right short side). A portion of the end surface support portion 32 that contacts the end surface of the front plate 6 is formed on a smooth surface having a low friction coefficient.

  The frame 11 is produced by forming a rectangular opening 11a in a steel plate, and the display area of the panel 2 can be viewed from the front side through the opening 11a. In FIG. 3, a broken line 11b shows the outer shape of the frame 11 as viewed from the observer side.

  As shown in FIG. 3, in Example 2, the center 2 a of the panel 2 (center with respect to the outer shape of the glass substrate) is shifted from the center 6 a of the front plate 6. 3, when the display device 20 is in the horizontal position, only the front plate 6 is supported in contact with the end surface support portion 32 of the panel holder 31 and the display device 20 is in the vertical position. Further, only the front plate 6 is supported by being in contact with the end surface support portion 32 of the panel holder 31. In both the horizontal position and the vertical position, the panel 2 does not contact the end surface support portion 32 of the panel holder 31. Therefore, regardless of whether the display device 20 is in the horizontal position or the vertical position, the panel holder 21 supports the panel unit 21 by the end surface of the front plate 6 subjected to the low friction treatment contacting the end surface support portion 32. The Thereby, irrespective of the orientation of the screen of the display device 20, the panel unit 21 is suppressed from being caught by the panel holder 31, the stress is suppressed from being generated in the panel 2, and the display unevenness is suppressed.

  In general, the panel holder 8 is configured to be in contact with and support at least a part of an end face that is on the lower side in the vertical direction when the panel unit 21 is rotated by the rotation mechanism in the front plate 6. good. For example, in the case where the display device 20 has a structure that rotates 90 degrees counterclockwise from the horizontal position to become the vertical position, the surface parallel to the left end (left side) of the front plate 6 when viewed from the observer side in the horizontal position. What is necessary is just to form the end surface support part 32 in (left short side). In this case, the shift direction between the center 2a of the panel 2 and the center 6a of the front plate 6 may be reversed left and right as in FIG. As described above, in the display device having the rotation mechanism, the sizes of the panel 2 and the front plate 6 are made substantially the same, and are pasted so that the center of the front plate 6 is shifted to the lower right or lower left with respect to the center of the panel 2. Also, the same effect as in the first embodiment can be obtained.

In the first and second embodiments, the example in which the present invention is applied to a display device including a rectangular panel has been described. However, the panel shape to which the present invention is applicable is not limited to a rectangle. Regardless of the shape of the panel, a front plate that is approximately the same shape as the panel is attached to the front side of the panel, and the front plate is supported by the panel holder, and the front plate is supported by the panel holder. If the process which reduces friction is given, the effect similar to Example 1 will be acquired. In addition, in a configuration having a mechanism that can change the screen position (horizontal position, vertical position, etc.), regardless of the shape of the panel, the end face of the front plate at the part where the panel holder contacts at each position On the other hand, a process for reducing friction may be applied.

  In the first and second embodiments, the configuration in which the transparent panel (front plate) is fixed to the front surface of the display panel is illustrated, but the transparent panel (rear plate) may be fixed to the back surface of the display panel. Even in this case, the panel holder 8 is configured to be in contact with and hold at least a part of the lower end face of the rear plate in the vertical direction, so that the same effect as in the first and second embodiments can be obtained. In this case, the first buffer member (elastic body 13) disposed between the frame that covers the peripheral edge of the panel unit 21 from the front side and the panel unit 21 is provided on the back side of the frame 11 and the peripheral edge of the display panel. It is arranged between the front side. In addition, a second buffer disposed between the panel unit 21 and a frame-shaped member (back support portion 9) configured from a surface parallel to the display surface, which covers the peripheral edge of the panel unit 21 from the back side. A member (elastic body 12) is arrange | positioned between the back side of the peripheral part of a rear surface plate, and the front side of a frame-shaped member.

(Example 3)
4 is a longitudinal sectional view showing a schematic configuration of the display device of Example 3, FIG. 5 is a front view seen from the observer side, and FIG. 6 is a longitudinal sectional view of the main part. Example 3 will be described with reference to these drawings. A description of the same arrangement, the same configuration, and the same functions as those in the first embodiment will be omitted.
The display device 30 is a display device using liquid crystal as in the first embodiment, and has a configuration including a panel 2 in which polarizing plates (polarizing films) are attached to both surfaces of two glass substrates enclosing liquid crystals.

  The adhesive 70 is a member for fixing the rear plate 60 to the panel 2. The adhesive 70 is disposed between the surface of the lower polarizing plate on the back side of the panel 2 and the front side of the rear plate 60, and is in close contact with the surface of the panel 2 and the rear plate 60. The adhesive 70 is an ultraviolet curable resin, and is colorless and transparent and has a refractive index of around 1.5 (for example, 1.50 to 1.52) and is close to a glass material in order to suppress the influence on the display quality of an image. Has optical properties.

The rear plate 60 is a transparent panel formed of a blue plate glass substrate having a thickness of 2.0 mm that is fixed to the back side of the panel 2. The rear plate 60 is rectangular when viewed from the front on the viewer side, and the dimensions thereof are larger than those of the panel 2 in both the short side and the long side.
The back support portion 90 is a first frame-like member that is formed at a peripheral portion on the front surface side of the backlight 14 and is configured by a surface parallel to the display surface of the panel unit 29. It is a certain part. The back support 90 is disposed so as to face along the four sides on the back side of the rear plate 60.

  The support frames 80 to 83 are members that have surfaces parallel to the upper, lower, left, and right end surfaces of the rear plate 60 and support the upper, lower, left, and right ends of the rear plate 60 and the back support 90. The support frames 80 to 83 are manufactured by pressing a steel plate into a U-shaped cross section, and house the upper, lower, left, and right ends of the rear plate 60 and the back support 90 inside the U-shape. Each of the support frames 80 to 83 is a fixing member having a bottom portion parallel to the end surface of the rear plate 60 and the end surface of the back support portion 90, and two wall surfaces perpendicular to the bottom portion. The panel unit 29 and the backlight 14 are fixed by inserting the peripheral portion of the rear plate 60 and the end portion of the back support portion 90 between the two wall surfaces.

The elastic body 37 is a frame-like member having elasticity arranged along the four sides on the back side of the rear plate 60, and is fixed by sticking a foamable material to the back support 90 with a double-sided tape. Elastic body 37
Is a cushioning material disposed between the peripheral edge of the rear plate 60 and the back support 90. The elastic body 37 can suppress damage due to direct contact with the surrounding members of the rear plate 60 made of a glass material, and can absorb the influence of deformation of the front plate 6 due to environmental factors such as temperature change. Will improve.

The light source substrate 33 is a circuit board screwed to the bottom inside the case 15. A plurality of LEDs (Light Emitting Diodes) are mounted on the surface of the light source substrate 33 in the direction of the panel 2, and a heat conductive sheet that is in thermal contact with the case 15 is provided on the surface in the opposite direction.
The light source drive board 34 is electrically connected to the light source board 33 via a connector, and supplies current to the LEDs. The light source drive board 34 is fixed to the back side of the case 15 with screws.

The attachment hole 35 is a through hole formed by pressing the flange 17 and is used when the display device 30 is fixed to the housing with a screw.
The screw 36 is a male screw for fixing the support frames 80 to 83 to the back surface support portion 90, and a female screw through which the screw 36 passes is processed in the back surface support portion 90.

Next, features of the display device according to the third embodiment will be described.
A procedure for assembling the display device according to the third embodiment will be described.
First, the backlight 14 is assembled by using the back support 90 to which the elastic body 37 is attached along the case 15, the light source substrate 33, the optical sheets 19, and the four sides. On the other hand, the panel unit 29 in which the rear plate 60 is attached to the back side of the panel 2 using the adhesive 70 is manufactured. A specific manufacturing method is as follows.

  An ultraviolet curable resin (adhesive 70) having a viscosity in the range of 3000 mPa · s to 4000 mPa · s is applied to the surface of the rear plate 60 facing the back side of the panel 2 using a dispenser device. After the adhesive 70 is applied, the glass substrate (TFT substrate) on the back side of the panel 2 is placed on the stage facing upward, and the rear plate 60 is brought into close contact with the glass substrate on the back side and pressed. Only at the start of pressurization, if the central portion of the rear plate 60 is slightly convex downward, the thickness of the adhesive 70 can be easily made uniform. When the adhesive 70 gradually spreads and sufficiently covers the image display area of the panel 2, the laminate of the panel 2 and the rear plate 60 is taken out. The adhesive 70 is cured by passing the laminate through an ultraviolet irradiation device. Since an ultraviolet curable resin having a viscosity of 3000 mPa · s to 4000 mPa · s is used for the adhesive 70, the adhesive 70 is prevented from flowing out, the curing time is short, and workability is improved. The panel 2 and the rear plate 60 are fixed by the above process. The structure thus obtained is referred to as a panel unit 29. With the backlight 14 in a state where the back support portion 90 to which the elastic body 37 is attached is turned up, the rear plate 60 of the panel unit 29 is brought into contact with the elastic body 37. Finally, the insides of the U-shaped cross sections of the support frames 80 to 83 are fitted so as to come into contact with the upper, lower, left and right end surfaces of the rear plate 60, and the support frames 80 to 83 are fixed to the back support portion 90 with screws 36.

  Next, the characteristic points of the display device of Example 3 will be described in comparison with the conventional example. The feature of the display device of the third embodiment is that the rear plate 60 is attached to the back side of the panel 2 with an adhesive 70, the peripheral portion of the rear plate 60 is fixed to the back support portion 90 of the backlight 14, and the rear plate 60 Is that the entire panel unit 29 is supported.

FIG. 7A is a vertical cross-sectional view of the main part of Example 3, and FIG. 7B is a vertical cross-sectional view of the main part of the conventional example.
The comparison of the thickness of the structure of the display device is performed based on the distance from the front surface of the optical sheets attached to the backlight 14 to the front surface of the panel (hereinafter referred to as “the thickness of the panel support structure”).

In the conventional example shown in FIG. 7B, the optical sheets 10 mounted on the backlight 106 are used.
6a Assume that the distance from the front surface to the back surface side of the panel 101 is 4.5 mm, the thickness of the panel 101 is 2.0 mm, and the thickness of the positioning elastic body 104 and the frame 102 is 2.3 mm. In this case, the thickness of the panel support structure is
4.5 + 2.0 + 2.3 = 8.8 mm
It is. In the conventional example, it is necessary to leave a certain distance between the front surface of the optical sheet 106a and the back surface of the panel 101 for the following reason. When receiving vibration from the outside during transportation or use, the panel 101 may move back and forth, and the optical sheet 106a may vibrate. At this time, the surface of the optical sheet 106a may come into contact with the polarizing plate attached to the back side of the panel 101, and in this case, the polarizing plate may be damaged. Further, the thickness of the positioning elastic body 104 and the frame 102 is a thickness necessary for positioning the panel 101 with a certain degree of freedom and a request for strength of the display device.

7A, the distance from the front surface of the optical sheet 19 attached to the case 15 of the backlight 14 to the back surface of the rear plate 60 is 1.0 mm, and the thickness of the rear plate 60 is 2. As shown in FIG. Assume that 0 mm, the thickness of the adhesive 70 is 0.2 mm, and the thickness of the panel 2 is 2.0 mm. In this case, the thickness of the panel support structure is 1.0 + 2.0 + 0.2 + 2.0 = 5.2 mm.
It is. In Example 3, the distance ensured from the front surface of the optical sheets 19 to the back surface of the rear plate 60 can be made shorter than in the conventional example. The reason is that a polarizing plate is not attached to the surface of the rear plate 60 even if the surface of the rear plate 60 and the surface of the optical sheet 19 are brought into contact with each other due to vibrations received from the outside during transportation or use. This is because there is no possibility of scratching the polarizing plate. Accordingly, the degree of freedom in setting the distance between the optical sheets 19 and the panel unit 29 is higher than before, and it is easy to meet the demand for thin display devices by shortening the distance.

  In the conventional example of FIG. 7B, the thickness of the panel support structure is 8.8 mm, whereas in Example 3 of FIG. 7A, it is 5.2 mm, which can be reduced by about 40%. became. It should be noted that the thickness of the rear plate 60 has no problem in terms of structural strength even when the thickness of the panel 2 is 30 inches and is 1.1 mm. When the thickness of the rear plate 60 is 1.1 mm, the thickness can be reduced by 50% or more compared to the conventional example. Further, if the weight to be supported by the rear plate 60 is reduced depending on the thickness and size of the panel 2, the thickness of the rear plate 60 can be further reduced, thereby further reducing the thickness. As described above, by using the rear plate 60 having an optimum thickness with respect to the screen size and thickness of the panel 2, it is possible to further reduce the thickness.

  In addition, since the panel 2 is fixed to the case 15 via the rear plate 60, a frame that presses the panel from the front and a cushioning material between the frame and the front of the panel, which are conventionally required, are unnecessary, and the panel unit 29 contributes to the overall thinning. Further, since the rear plate 60 was attached to the back side of the panel 2 with the adhesive 70, the strength of the entire panel unit 29 was increased. Even when the polarizing plate is deformed due to environmental factors such as moisture absorption, the panel 2 can be prevented from being deformed such as warpage, and the occurrence of display unevenness due to the deformation of the panel 2 can be suppressed, thereby improving the image quality.

Example 4
FIG. 8 is a longitudinal sectional view of a display device according to a fourth embodiment of the present invention, and FIG. 9 is a longitudinal sectional view of an essential part. FIG. 9A is a diagram showing a structure using the support frame 26, and FIG. 9B is a diagram showing a structure not using the support frame 26. Note that description of the same arrangement, the same components, and the same functions as those in the third embodiment will be omitted.
The display device 40 is a display device using the properties of liquid crystal, as in the third embodiment.
The panel unit 21 includes a panel 2 described later, an adhesive 70, a rear plate 22, and a fixed frame 23.

  The rear plate 22 is a blue plate glass substrate having a thickness of 2.0 mm, which is disposed on the back side of the panel 2. The rear plate 22 is rectangular when viewed from the front on the viewer side, and the dimensions thereof are smaller than those of the panel 2 on both the short side and the long side. Since the rear plate 22 is attached to the back side of the panel 2 with the adhesive 70, the strength of the panel 2 is increased, and the panel 2 is prevented from being deformed when the polarizing plate is deformed due to environmental factors such as moisture absorption. Display unevenness due to deformation of the panel 2 can be suppressed, and the image quality is improved.

  The fixed frame 23 is a second frame-like member fixed to the rear plate 22 so as to cover the peripheral portion of the rear plate 22 from the back side, and a backlight is provided at the center of a rectangular metal plate having a thickness of 0.8 mm. It is produced by providing an opening for passing 14 illumination light beams.

  The adhesive 24 is a member for fixing the rear plate 22 to the fixed frame 23. The adhesive 24 is an ultraviolet curable resin applied along the four sides of the fixed frame 23. The adhesive region 39 indicates a range where the adhesive 24 is applied on the fixed frame 23. The adhesive region 39 has a frame shape when viewed from the front on the viewer side. The panel unit 21 is configured by fixing the fixing frame 23 to the rear plate 22 using the adhesive 24. Since the panel unit 21 is configured by adhering the rear plate 22 to the metal fixed frame 23 using the adhesive 24, the fixed frame 23 which is not easily damaged can be used during transport and the like, and the handleability during assembly is also good.

  A rear surface support portion 90 that is a first frame-like member composed of a surface parallel to the display surface of the panel unit 21 is formed on the peripheral portion on the front surface side of the backlight 14, and the rear surface support portion 90 is a fixed frame. 23 are arranged so as to face along the four sides on the back side. The fixed frame 23 is fixed to the back support part 90. The side wall 38 is an outer wall surface of the case 15, is configured by a surface perpendicular to the panel 2, and a female screw for fastening with the screw 36 is processed.

  The support frame 26 is a fixing member having a bottom portion parallel to the end surface of the back support portion 90 and the end surface of the fixed frame 23 and two wall surfaces perpendicular to the bottom portion. By inserting the end portions of the fixed frame 23 and the back support portion 90 between the two wall surfaces, the fixed frame 23 and the back support portion 90 are fixed. The support frame 26 is manufactured by pressing a steel plate into a U-shaped cross section, and houses the ends of the fixed frame 23 and the back support part 90 inside the U-shape. The support frame 26 has a portion formed by a surface parallel to the side wall 38 of the case 15 of the backlight 14 at the rear, and a hole through which the screw 36 passes is provided in this portion. The support frame (upper) having the same cross-sectional shape as the support frame 26 is disposed at the upper end of the panel unit 21, the support frame (left) is disposed at the left end of the panel unit 21, and the support frame (right) is disposed at the right end of the panel unit 21. Then, the fixed frame 23 is surrounded by a frame shape and fixed to the backlight 14.

The structure for fixing the fixed frame 23 to the backlight 14 is not limited to the structure of FIG. FIG. 9B shows an example of a structure for fixing the fixed frame 23 to the backlight 14 without using the support frame 26.
In FIG. 9 (B), the fixed frame 23 includes a plane portion constituted by a plane parallel to the display surface of the panel unit 21 that covers the peripheral edge portion of the rear plate 22 from the back side, and the plane portion is bent. And a wall surface portion perpendicular to a flat surface portion provided continuously. The bent portion becomes a surface parallel to the side wall 38 of the case 15 of the backlight 14, and a hole through which the screw 36 passes is processed in the bent portion, and the panel unit 21 is fixed to the outer wall surface of the backlight 14. In this structure, the back support part 90 existing in the structure of FIG. In the structure of FIG. 9B, the support frame 26 is unnecessary.

Next, features of the display device according to the fourth embodiment will be described.
A procedure for assembling the display device according to the fourth embodiment will be described.
FIG. 10 is a plan view of a structure in which the rear surface side of the rear plate 22 and the front surface side of the fixed frame 23 are attached with an adhesive 24 as viewed from the front on the viewer side. FIG. 11A is a cross-sectional view of the structure of FIG. 10, and FIG. 11B is a structure in which the panel 2 is attached to the front surface of the rear plate 22 using the adhesive 70 with respect to the structure of FIG. FIG.

  First, the adhesive 24 is linearly applied to the adhesive region 39 along the four sides of the flat fixed frame 23 by a dispenser. The thickness of the adhesive 24 is 50 μm to 200 μm. Next, the rear plate 22 is put on the fixed frame 23. By using the positioning jig to perform the positioning in the planar direction and the positioning in the height direction, the assembly accuracy is improved. In this state, ultraviolet light 27 is irradiated as shown by an arrow UV in FIG. Next, the adhesive 70 is uniformly applied to the observer side surface of the rear plate 22 with a thickness of 200 μm using a slit coater device. The panel 2 is set on the stage in the vacuum chamber with the back side facing up, and the rear plate 22 is inverted so that the application surface of the adhesive 70 faces downward, and is set at a distance from the panel 2. At this time, using the positioning jig, positioning in the plane direction and positioning in the height direction are performed, so that the assembly accuracy is improved. After the air is exhausted to bring the vacuum chamber into a substantially vacuum state, the stage on which the panel 2 is placed is gradually raised and attached to the rear plate 22. After releasing the vacuum state, the panel unit 21 is taken out and irradiated with ultraviolet light 28 as indicated by an arrow UV in FIG. When the ultraviolet light is irradiated along the four sides of the fixed frame 23, the curing time can be shortened by tilting the irradiation angle of the ultraviolet light. The panel unit 21 obtained through the above steps is placed on the backlight 14 with the back support 90 facing upward, and the inside of the U-shaped cross section of the support frame 26 is placed on the upper, lower, left, and right sides of the fixed frame 23. It fits so that it may contact each end surface of a edge | side, and it fixes with the screw | thread 36. FIG.

Features of the display device according to the fourth embodiment will be described.
Since the rear plate 22 is attached to the back side of the panel 2, even if the optical sheet 11 of the backlight 14 and the panel unit 21 come into contact with each other due to vibration during transportation, the polarizing plate on the surface of the panel 2 does not come into contact. Therefore, it is possible to suppress the polarizing plate from being damaged. Therefore, the distance between the panel unit 21 and the optical sheet 11 can be shortened, and the display device can be thinned.

  The panel unit 21 is a support structure that is fixed to the backlight 14 by fixing the fixed frame 23 to the case 15 of the backlight 14. This eliminates the need for the frame for holding the panel together with the panel holder from the front side of the panel and the cushioning material between the frame and the panel, which are conventionally required, and enables a reduction in thickness.

  Since the panel unit 21 is arranged on the front side of the case 15 of the backlight 14 via the fixed frame 23, the support frame 26 having a U-shaped cross section is fitted on four sides and fixed with screws 36. Excellent in properties. A structure in which the outer peripheral portion of the fixed frame 23 is bent without using the U-shaped support frame 26 and the bent portion is fixed to the side wall surface of the case can be obtained. In this case, further improvement in assembling workability and material cost can be achieved. Can be reduced.

  In Example 4, an ultraviolet curable resin was used for bonding the panel 2 and the rear plate 22, but a transparent optical double-sided tape without a base layer may be used. In that case, the ultraviolet light irradiation process for adhesion | attachment with the panel 2 and the rear surface board 22 can be skipped. Further, a thermosetting resin can also be used. In that case, in the bonding process between the panel 2 and the rear plate 22, the laminate of the panel 2 and the rear plate 22 is placed in a temperature bath and heat-treated to cure the resin. At this time, it is desirable that the conditions be such that the panel 2 can be heat-treated at a temperature or lower (for example, 70 degrees or lower) at which reliability problems do not occur. In the third and fourth embodiments, the fixed frame 23 is bonded to the rear plate 22, but the fixed frame 23 can be directly bonded to the panel 2. In that case, the distance between the polarizing plate on the back side of the panel 2 and the optical sheet 19 needs to be sufficiently separated.

  In the above embodiments, the front plate or the rear plate is not limited to a glass material. For example, an acrylic material that is a transparent resin having a high elastic modulus may be used. Thereby, weight reduction is achieved.

1: Display device, 2: Panel, 6: Front plate, 8: Panel holder

Claims (20)

A display panel for displaying an image based on the image data;
A transparent panel fixed to the front or back of the display panel;
A panel unit having
A holding member for holding the panel unit by supporting an end surface of the transparent panel;
With
The display device according to claim 1, wherein the holding member is in contact with and supports at least a part of an end face on the lower side in the vertical direction of the transparent panel.   The display device according to claim 1, wherein at least a portion of the end face of the transparent panel that is supported by the holding member is subjected to a process for reducing friction as compared with other portions.   The display device according to claim 1, wherein at least a portion of the holding member that comes into contact with an end surface of the transparent panel is made of a material having a lower hardness than the transparent panel. The display panel and the transparent panel are rectangular,
The display device according to claim 1, wherein the holding member holds the panel unit by supporting an end surface along a lower side of the transparent panel. A mechanism for rotating the panel unit around an axis perpendicular to the screen;
The said holding member contacts and supports at least one part among the end surfaces which come down in the perpendicular direction when a panel unit is rotated by the said mechanism among the said transparent panels. The display device according to item. The mechanism is rotatable clockwise when the panel unit is viewed from the observer side,
The display device according to claim 5, wherein the holding member holds the panel unit by supporting an end surface along the lower side of the transparent panel and an end surface along the right side when viewed from the observer side. The mechanism is rotatable counterclockwise when the panel unit is viewed from the observer side,
The display device according to claim 5, wherein the holding member holds the panel unit by supporting an end surface along the lower side of the transparent panel and an end surface along the left side as viewed from the viewer side.   The size of the said display panel and the said transparent panel is substantially the same, The center of the said transparent panel has shifted | deviated to the lower right or the lower left with respect to the center of the said display panel. Display device. A frame-like member that covers the peripheral edge of the panel unit from the front side;
A first buffer member disposed between the rear surface side of the frame-shaped member and the front surface side of the peripheral edge of the panel unit;
The display device according to claim 1, further comprising: A frame-shaped member configured to cover a peripheral portion of the panel unit from the back side, and configured from a surface parallel to the display surface of the panel unit;
A second buffer member disposed between the back side of the peripheral edge of the panel unit and the front side of the frame member;
The display device according to claim 1, further comprising:   The display device according to claim 10, wherein the frame-shaped member is configured integrally with the holding member. A display panel for displaying an image based on the image data;
A transparent panel fixed to the back of the display panel;
A panel unit having
An illumination device for irradiating the panel unit with light from the back side;
With
A first frame-like member composed of a surface parallel to the display surface of the panel unit is formed in the peripheral portion on the front side of the lighting device,
The display unit, wherein the panel unit is fixed to the lighting device by fixing a peripheral portion of the transparent panel to the first frame member. A fixing member having an end surface of the transparent panel, a bottom portion parallel to the end surface of the first frame-like member, and two wall surfaces perpendicular to the bottom portion;
The panel unit and the lighting device are fixed by inserting a peripheral edge portion of the transparent panel and an end portion of the first frame-shaped member between the two wall surfaces of the fixing member. The display device described in 1.   The display device according to claim 13, further comprising a cushioning material disposed between a peripheral portion of the transparent panel and the first frame-shaped member. A display panel for displaying an image based on the image data;
A transparent panel fixed to the back of the display panel;
A second frame-like member fixed to the transparent panel so as to cover the peripheral edge of the transparent panel from the back side;
A panel unit having
An illumination device for irradiating the panel unit with light from the back side;
With
The display unit, wherein the panel unit is fixed to the lighting device by fixing the second frame member to the lighting device. A first frame-like member composed of a surface parallel to the display surface of the panel unit is formed in the peripheral portion on the front side of the lighting device,
The display device according to claim 15, wherein the second frame member is fixed to the first frame member of the illumination device. A fixing member having an end surface of the first frame-shaped member, a bottom portion parallel to the end surface of the second frame-shaped member, and two wall surfaces perpendicular to the bottom portion;
By inserting the end of the first frame-shaped member and the end of the second frame-shaped member between the two wall surfaces of the fixing member, the first frame-shaped member and the second frame The frame-shaped member is fixed to the display device according to claim 16. The second frame-shaped member is provided continuously with the plane portion configured by a plane parallel to the display surface of the panel unit that covers the peripheral portion of the transparent panel from the back side, and the plane portion. And a wall surface perpendicular to
The display device according to claim 17, wherein the panel unit is fixed to the lighting device by fixing the wall surface portion of the second frame-shaped member to an outer wall surface of the lighting device.   The display device according to claim 1, wherein the transparent panel is made of glass or acrylic.   The display device according to claim 1, wherein the transparent panel is fixed to the display panel with an adhesive of a transparent resin that is cured by ultraviolet rays or heating and has the same optical characteristics as glass.

Images