JP6971621B2 - Display device - Google Patents

Description

The present invention relates to a display device.

In recent years, the mainstream of display modules used in display devices is a display module that uses an LED light source for a liquid crystal panel and a backlight. Further, as a display device that requires high image quality characteristics for business use or the like, a direct type backlight structure in which a light source substrate is arranged on the back side of a liquid crystal panel is used. Further, the backlight has a light source substrate housed in a box-shaped case, and an optical sheet for polarizing light is provided in front of the light source substrate. Further, inside the backlight, a reflective sheet covering the surface of the light source substrate and the side wall of the case is arranged to improve the luminous efficiency.

Here, the holding structure of the conventional reflective sheet will be described.
FIG. 10 is a diagram showing a holding structure of the reflective sheet in the conventional example.
The light source substrate 125 on which a plurality of LED light sources 125a are mounted is housed inside a box-shaped case 128 including a flat surface portion for holding the light source substrate 125 and a side wall portion 128b that covers the periphery. The reflective sheet 127 is composed of a flat surface portion 127a that covers the surface of the light source substrate 125 and a side wall portion 127b that covers the side wall portion 128b of the case 128. Further, the reflective sheet 127 has mounting holes in the flat surface portion 127a and the side wall portion 127b, and is held in the case 128 by screws 170.
The reflective sheet 127 is formed by bending a resin sheet material. Therefore, a gap H is generated in the corner portion of the reflective sheet due to the material being stretched during bending to form an R shape inside the bending and the dimensional tolerance of processing. Due to the generation of the gap H, there is a concern that foreign matter such as dust D may enter and the display quality may be deteriorated.
Patent Document 1 proposes a structure in which a slit is provided in one of the two side wall portions forming the corner portion of the reflective sheet, a convex shape is formed in the other, and the two side wall portions are fitted so as not to generate a gap in the corner portion. There is.

Japanese Patent No. 5319591

However, in the technique described in Patent Document 1, since the reflective sheet is formed by bending a resin sheet material having low rigidity, the two side wall portions forming the corners are subjected to force during assembly or slits. And there is a possibility of deformation due to the dimensional tolerance of convex processing. If the corners of the reflective sheet are deformed, display unevenness will occur, and if gaps are created due to the deformation, foreign matter will invade and the display quality will deteriorate.

The present invention has been made in view of the above circumstances, and an object of the present invention is to prevent deformation and gaps from being generated at the corners of the reflective sheet provided in the display device.

The present invention adopts the following configuration. That is,
A case for accommodating a light source substrate having a plurality of light sources for illuminating a display panel from the back, and a case having a bottom for holding the light source substrate and a plurality of case side walls surrounding the bottom.
A reflective sheet that reflects the light emitted from the light source, which is provided corresponding to a flat surface portion arranged substantially parallel to the light source substrate and a side wall portion of each case, and covers the side wall portion of the case. A reflective sheet with a part and
In a display device having a gap between two adjacent case side walls forming a corner portion of the case.
Each of the side wall portions of the seat covering the side wall portions of the two cases is provided with an extension portion extending to the outside of the case through the gap.
The two extensions of the same size, which have symmetrical shapes, are overlapped with each other.
The two extended length portion, in a state of being superimposed, a display device characterized by being sandwiched between the two cases sidewall portion.

According to the present invention, it is possible to prevent deformation and gaps from being generated at the corners of the reflective sheet provided in the display device.

An exploded perspective view showing a schematic configuration of the display device of the first embodiment. An exploded perspective view showing a display module of the display device of the first embodiment. Detailed view showing the corners of the reflective sheet in the display device of the first embodiment. The figure which shows the reflection sheet holding structure of 1st Example The figure which shows the reflection sheet holding structure of another form. Detailed view showing the corners of the reflective sheet in the display device of the second embodiment. The figure which shows the reflection sheet holding structure of 2nd Example The figure which shows the reflection sheet holding structure of another form. The figure which shows the reflection sheet holding structure of another form. The figure which shows the holding structure of the conventional reflective sheet

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The technical scope of the present invention is determined by the scope of claims and is not limited by the examples illustrated below. Also, not all combinations of features described in the examples are essential to the present invention. The content described herein and in the drawings is exemplary and should not be considered as limiting the invention. Various modifications (including organic combinations of each example) are possible based on the gist of the present invention, and they are not excluded from the scope of the present invention.

(First Example)
FIG. 1 is an exploded perspective view showing a schematic configuration of a display device 1 according to a first embodiment of the present invention. In FIG. 1, the front side of the drawing is the back side of the display device 1 (rear, indicated by R in the figure), and the back side of the drawing is the front side of the display device 1 (front, indicated by F in the figure).
The display device 1 includes a front cover 10, a display module 20, a drive board 30, a circuit board 40, a fan 50, and a rear cover 60.

The front cover 10 is a housing that covers the display module 20 from the front surface. Further, the front cover 10 is a member in which a resin material is formed into a frame shape by injection molding. Further, the front cover 10 is provided with an opening 10a so that the display area of the display module 20 is exposed to the front side.
The drive board 30 controls the drive of the display module 20 based on the data input from the circuit board 40. Further, since it is desirable to shorten the length of the cable connected to the display module 20 as a noise countermeasure, the drive board 30 is arranged close to the back side of the display module 20.

The circuit board 40 is composed of an image processing board for processing image data displayed by the display module 20 and a power supply board for supplying electric power to the display module 20. The circuit board 40 is arranged on the back side of the display module 20.
The fan 50 is an exhaust device that exhausts heat generated in the display module 20 and the circuit board 40 to the outside. Further, the fan 50 is arranged in the upper part on the back side of the display module.
The rear cover 60 is a housing that houses the back surface of the display module 20, the drive board 30, the circuit board 40, and the fan 50. The rear cover 60 is a member formed by bending a sheet metal into a box shape by press working. Further, the rear cover 60 is provided with an exhaust hole 60a at a position facing the fan 50 at the upper part on the back side, and an intake hole 60b for sucking air from the outside is provided at the lower part on the back side.

FIG. 2 is an exploded perspective view showing the display module 20 of the display device 1 of this embodiment. In FIG. 2, the front side of the drawing is the front side of the display module 20 (front, indicated by F in the figure), and the back side of the drawing is the back side of the display module 20 (rear, indicated by R in the figure).
The display module 20 includes a liquid crystal panel (display panel) 21, a frame 22, and a backlight 23. Further, the backlight 23 includes a holder 24, a light source substrate 25, an optical sheet 26, a reflective sheet 27, and a case 28.

The display module 20 has a structure in which a backlight 23 is arranged on the back side of the liquid crystal panel 21 for displaying an image to illuminate the liquid crystal panel 21.
The liquid crystal panel 21 has a configuration in which a pair of glass substrates composed of a thin film transistor (TFT) substrate and a color filter (CF) substrate are arranged in parallel at a predetermined interval and faced with each other, and the liquid crystal display is filled in the interval. .. Further, the liquid crystal panel 21 has a plurality of pixels, and the orientation of the liquid crystal of each pixel is driven and controlled by the drive substrate 30, so that an image is displayed on the liquid crystal panel 21. The liquid crystal panel 21 and the drive board 30 are connected by a flexible wiring cable.

The frame 22 is a support member that supports the peripheral area of the display area of the liquid crystal panel 21 from the front surface. Further, the frame 22 is a frame-shaped member obtained by molding a sheet metal by press die processing.
The holder 24 is a support member that supports the peripheral area of the display area of the liquid crystal panel 21 from the back surface. Further, the holder 24 is a member in which a resin material is formed into a frame shape by injection molding.
With the above configuration, the liquid crystal panel 21 is supported by sandwiching the peripheral area of the display area between the frame 22 and the holder 24. Here, it is preferable that an elastic cushion is arranged between the liquid crystal panel 21 and the frame 22 and between the liquid crystal panel 21 and the holder 24.

The light source substrate 25 is a substrate in which a plurality of LED light sources 25a are arranged in a matrix.
The optical sheet 26 is a member for improving optical characteristics such as brightness and uniformity of light emitted from the light source substrate 25. Further, the optical sheet 26 is configured by combining a plurality of sheets such as a diffuser plate and a prism sheet.

The case 28 is a member formed by pressing a sheet metal into a box shape. The light source substrate 25 is housed inside the case 28. The case 28 has a bottom portion (hereinafter referred to as a flat surface portion) 28a that holds the back surface side of the light source substrate 25, and a plurality of side wall portions (case side wall portions) 28b that are connected to the flat surface portion 28a and surround the periphery of the light source substrate 25. In the case 28, as shown in FIG. 4 described later, there is a gap L between adjacent side wall portions (side wall portions 28b1, 28b2) forming the corner portions of the case 28. Further, the case 28 has a structure in which the optical sheet 26 is held between the case 28 and the holder 24, and the inside of the case 28 is sealed. Further, the case 28 functions as a heat radiating plate that transfers the heat generated by the light source substrate 25 to the back surface side and releases it to the space. Further, a heat radiating member such as a heat sink may be provided on the back surface of the case 28 in order to improve heat dissipation.

3A to 3C are detailed views showing the corners of the reflective sheet 27 in the display device 1 of this embodiment. 3A shows a developed form of the reflective sheet, FIG. 3B shows a formed form of the reflective sheet, and FIG. 3C shows an enlarged view of part A of FIG. 3B. FIG. 4 is a detailed view showing the reflective sheet holding structure of this embodiment.

The reflective sheet 27 is a member that improves the luminous efficiency by re-reflecting the light emitted from the light source on the light source substrate 25 that does not pass through the optical sheet 26 and is reflected toward the optical sheet 26 side.
Further, the reflective sheet 27 has a structure in which a sheet material made of a resin material having high reflectance is cut as shown in FIG. 3A and bent according to a folding line (bent portion) 27i as shown in FIG. 3B to form a box shape. ing.

The reflective sheet 27 is a covering portion that covers a region of the surface of the light source substrate 25 excluding the light source region, and is a covering portion (hereinafter, flat portion) 27a arranged parallel to (substantially parallel to) the light source substrate 25, and a case. It has a plurality of side wall portions (seat side wall portions) 27b that cover the inside (side wall portion 28b) of 28. The side wall portion 27b of the reflective sheet 27 is provided corresponding to each side wall portion 28b of the case 28, and in this embodiment, the side wall portions provided corresponding to the adjacent side wall portions 28b1 and 28b2 of the case 28. 27b1,27b2 will be described.

The flat surface portion 27a has an opening 27c and a mounting hole 27d, and the side wall portion 27b has a mounting hole 27e. Then, the screw 70 is fastened to the flat surface portion 28a of the case 28 via the mounting hole 27d of the flat surface portion 27a, and the screw 70 is fastened to the side wall portion 28b of the case 28 via the mounting hole 27e of the side wall portion 27b. , The reflective sheet 27 is held in the case 28. Further, the opening 27c of the flat surface portion 27a is arranged so as to take a position corresponding to the LED light source 25a of the light source substrate 25 when the reflective sheet 27 is held by the case 28.

The characteristic configuration of this embodiment will be described below.
In this embodiment, the corners of the reflective sheet 27 formed by the two side wall portions 27b1, 27b2 are provided with a first extension portion 27f (hatched portion shown in FIG. 3A) and a second extension portion 27g, respectively. There is.
The first extension portion 27f is a portion provided on one side wall portion 27b1 and, when attached to the case 28, is a portion that extends to the outside of the case 28 through the gap L at the corner of the case. ..
The second extension portion 27g is a portion provided on the other side wall portion 27b2, and is bent outward by a folding line 27i so as to be parallel to the first extension portion 27f, and when attached to the case 28, It is a portion extending to the outside of the case 28 through the gap L at the corner of the case.
Then, the first extension portion 27f and the second extension portion 27g are sandwiched in the gap L formed by the side wall portion 28b1 and the side wall portion 28b2 of the case 28 in a superposed state, whereby the corner portion of the reflective sheet 27 is formed. Is held in the case 28.

In this way, the first extension portion 27f and the second extension portion 27g are sandwiched in the gap L between the side wall portion 28b1 and the side wall portion 28b2 of the case 28 in a superposed state. Further, it is possible to suppress the formation of a gap between the first extension portion 27f and the second extension portion 27g. As a result, it is possible to prevent a gap from being generated at the corner portion of the reflective sheet 27.
Further, by holding the corners of the reflective sheet 27 in the case 28 by such a configuration, it is possible to prevent the corners of the reflective sheet 27 from being deformed, and the corners of the reflective sheet 27 can be prevented from being deformed. It is possible to suppress the occurrence of display unevenness due to the deformation of. Further, as in the present embodiment, by sandwiching and holding the corner portion of the reflective sheet 27 in the gap L between the side wall portion 28b1 and the side wall portion 28b2 of the case 28, the reflective sheet 27 is deformed even if an external force acts. It can be suppressed from doing so.
Therefore, by suppressing the deformation of the reflective sheet 27, it is possible to suppress the generation of gaps at the corners of the reflective sheet 27. As a result, it is possible to prevent foreign matter such as dust D from entering through the corners of the reflective sheet 27, and it is possible to prevent the display quality from being deteriorated due to the intrusion of foreign matter.

Here, the size of the gap L formed by the side wall portion 28b1 and the side wall portion 28b2 of the case 28 may be set to be equal to or less than the sum of the thickness T of the reflective sheet 27 sandwiched by the gap L. In this embodiment, the relationship between the dimension of the gap L and the thickness T of the reflective sheet 27 satisfies L ≦ T × 2.
As a result, it is possible to more reliably suppress the formation of gaps in the corners of the reflective sheet 27, and it is possible to suppress the deformation of the corners of the reflective sheet 27.

Hereinafter, other forms of the reflective sheet holding structure will be described.
FIG. 5 is a diagram showing another form of the reflective sheet holding structure.
FIG. 5 shows a mode in which a convex portion 28c is provided on the side wall portion 28b1 and a gap L such that L ≦ T × 2 is formed between the side wall portion 28b1 and the side wall portion 28b2.
In this way, the size of the gap L is set (adjusted) in at least one of the side wall portion 28b1 and the side wall portion 28b2 so that the size of the gap L satisfies the relationship of L ≦ T × 2. ) May be provided.

Further, in the present embodiment, the first extension portion 27f exists on substantially the same plane as the side wall portion 27b1, and the second extension portion 27g is bent with respect to the side wall portion 27b2 by a folding line 27i. , The configuration superposed with the first extension portion 27f has been described. However, it is not limited to such a configuration. For example, the second extension portion 27g exists on substantially the same plane as the side wall portion 27b2, and the first extension portion 27f is folded with respect to the side wall portion 27b1 by a folding line so as to be overlapped with the second extension portion 27g. It may be one. Further, the first extension portion 27f and the second extension portion 27g may be overlapped with each other by bending the first extension portion 27f and the second extension portion 27g with respect to the corresponding side wall portions. ..
Further, in the present embodiment, the reflective sheet 27 is composed of one sheet-shaped member, but is not limited to this, and may be composed of a plurality of sheet-shaped members.

(Second Example)
The display device 1 of the second embodiment will be described below. In this embodiment, components different from those of the first embodiment will be described, and the description of the same components as those of the first embodiment will be omitted.

6A to 6C are detailed views showing the corners of the reflective sheet in the display device 1 of this embodiment. 6A shows a developed form, FIG. 6B shows a formed form, and FIG. 6C shows an enlarged view of a portion B of FIG. 6B. FIG. 7 is a detailed view showing the reflective sheet holding structure of this embodiment.
In this embodiment, the reflective sheet 27 has a structure in which a sheet material made of a resin material having high reflectance is cut as shown in FIG. 6A and bent along a fold line as shown in FIG. 6B to form a box shape. There is.

As a feature of this embodiment, in addition to the first extension portion 27f and the second extension portion 27g described in the first embodiment, the corner portions of the reflective sheet 27 formed by the two side wall portions 27b1,27b2 are further formed. , A folded portion 27h is provided.
The folded-back portion 27h is a portion provided on the tip end side of the first extension portion 27f (hatched portion shown in FIG. 6A), and the first extension portion 27f is further extended and folded back on the outside of the case 28 to form a case. It is a portion configured to extend toward the inside of 28 and cover (sandwich) the second extension portion 27g.

Then, in this embodiment, the first extension portion 27f, the second extension portion 27g, and the folded portion 27h are sandwiched by the gap L formed by the side wall portion 28b1 and the side wall portion 28b2 of the case 28 in a superposed state. There is. As a result, the corners of the reflective sheet 27 are held by the case 28.
Further, in this embodiment, the gap L is sandwiched by three reflective sheets 27 (first extension portion 27f, second extension portion 27g, and folded portion 27h), so that the dimension of the gap L is that of the reflection sheet 27. The relationship with the thickness T is set to satisfy L ≦ T × 3.

According to this embodiment, the same effect as that of the first embodiment described above can be obtained. Further, in this embodiment, the folded portion 27h is provided so as to be sandwiched by the gap L together with the extension portion, so that the size of the gap L is set to be larger than that in the first embodiment. Can also be suitably dealt with.
Further, since the first extension portion 27f provided on the side wall portion 27b1 and the folded portion 27h are configured to sandwich and cover the second extension portion 27g provided on the side wall portion 27b2, dust in the reflective sheet 27 is formed. The effect of suppressing the invasion of foreign substances such as D can be further enhanced.

The other forms will be described below.
FIG. 8 is a diagram showing another form of the reflective sheet holding structure.
In the form shown in FIG. 7, the folded-back portion 27h was folded back so as to cover the second extension portion 27g. On the other hand, in the form shown in FIG. 8, the folded-back portion 27h is folded back on the side opposite to the form shown in FIG. 7. In this way, the corners of the reflective sheet 27 in a state where the folded-back portion 27h is overlapped with the second extension portion 27g so as to sandwich the first extension portion 27f are sandwiched in the gap L. You may.

FIG. 9 is a diagram showing another form of the reflective sheet holding structure.
In the form shown in FIG. 7, the first extension portion 27f provided with the folded portion 27h on the tip end side exists substantially on the same plane as the side wall portion 27b1, and the second extension portion 27g is bent with respect to the side wall portion 27b2. By doing so, it was configured to be overlapped with the first extension portion 27f.
On the other hand, as shown in FIG. 9, the first extension portion 27f provided with the folded portion 27h on the tip end side is bent with respect to the side wall portion 27b1, and the second extension portion 27g is abbreviated as the side wall portion 27b2. It may be configured to exist on the same plane.
Such a configuration can also be realized by providing the folded portion on the tip end side of the second extension portion 27g instead of the tip end side of the first extension portion 27f with respect to the configuration shown in FIG. 7.

1 ... Display device, 21 ... Liquid crystal panel, 25 ... Light source substrate, 27 ... Reflective sheet, 27a ... Flat surface, 27b1,27b2 ... Side wall, 27f ... First extension, 27g ... Second extension, 28 ... Case, 28a ... Flat surface portion, 28b1, 28b2 ... Side wall portion, L ... Gap

Claims (8)

A case for accommodating a light source substrate having a plurality of light sources for illuminating a display panel from the back, and a case having a bottom for holding the light source substrate and a plurality of case side walls surrounding the bottom.
A reflective sheet that reflects the light emitted from the light source, which is provided corresponding to a flat surface portion arranged substantially parallel to the light source substrate and a side wall portion of each case, and covers the side wall portion of the case. A reflective sheet with a part and
In a display device having a gap between two adjacent case side walls forming a corner portion of the case.
Each of the side wall portions of the seat covering the side wall portions of the two cases is provided with an extension portion extending to the outside of the case through the gap.
The two extensions of the same size, which have symmetrical shapes, are overlapped with each other.
The two extended length portion, in a state of being superimposed, the display device characterized by being sandwiched between the two cases sidewall portion. Of the two extensions, the tip end side of the first extension is folded back on the outside of the case and extends toward the inside of the case, and is sandwiched by the two case side walls together with the two extensions. The display device according to claim 1, wherein a folded portion is provided. The claim is characterized in that the second extension portion of the two extension portions is sandwiched between the two case side wall portions in a state of being sandwiched between the first extension portion and the folded portion. The display device according to 2. Of the two extension portions, the first extension portion exists on substantially the same plane as the seat side wall portion provided with the first extension portion.
A bent portion is provided between the seat side wall portion provided with the second extension portion of the two extension portions and the second extension portion.
Claims 1 to 3 are characterized in that the second extension portion is overlapped with the first extension portion by being bent at the bent portion with respect to the seat side wall portion provided with the second extension portion. The display device according to any one of the above items. A bent portion is provided between the seat side wall portion provided with the first extension portion of the two extension portions and the first extension portion.
The second extension portion of the two extension portions exists on substantially the same plane as the seat side wall portion provided with the second extension portion.
Claims 1 to 3 are characterized in that the first extension portion is overlapped with the second extension portion by being bent at the bent portion with respect to the seat side wall portion provided with the first extension portion. The display device according to any one of the above items. The feature is that the size of the gap between the two side wall portions of the case is set to be equal to or less than the sum of the thicknesses of the reflective sheets sandwiched between the side wall portions of the two cases. The display device according to any one of claims 1 to 5. The two protrusions for setting the size of the gap between the two case side walls to be equal to or less than the sum of the thicknesses of the reflective sheets sandwiched between the two case side walls. The display device according to any one of claims 1 to 6, wherein the display device is provided on at least one of the case side wall portions. The display device according to any one of claims 1 to 7, wherein the reflective sheet is composed of one sheet-shaped member.

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