JP5275542B2 - Flat display device and liquid crystal display device - Google Patents

Description

  The present invention relates to a flat display device having a flat display panel having a display region for displaying an image and a liquid crystal display device.

  In recent years, a liquid crystal display device as a flat display device of this type has been used in various fields in the form of a so-called notebook personal computer, taking advantage of its thin and lightweight features.

  The liquid crystal display device includes a rectangular flat liquid crystal panel. A circuit board that supplies a drive signal to the liquid crystal panel is electrically connected to the liquid crystal panel. The liquid crystal panel is housed and held between a bezel cover and a frame, and a planar light source device for making planar light incident on the liquid crystal panel is housed between the liquid crystal panel and the frame. Has been attached.

The planar light source device includes a tubular light source and a rectangular flat light guide that converts linear light from the tubular light source into a planar light source that is planar light. The light guide is formed of a light-transmitting resin, and a prism is provided on the back surface of the light guide. Moreover, a reflector that covers the tubular light source and makes light from the tubular light source incident on one side of the light guide is attached to one side of the light guide. A configuration in which one side portion of the reflector is sandwiched between a light guide and a frame is known (see, for example, Patent Document 1).
JP 2002-270024 A (page 3-5, FIGS. 1 to 3)

  However, the above-described liquid crystal display device has a configuration in which one side portion of the reflector of the planar light source device is sandwiched between the light guide and the frame. Therefore, it is possible to prevent high luminance and high-quality luminance unevenness. However, in the thermal shock test, which is a temperature cycle test of the environmental test, the light guide body is opposite to the tubular light source due to thermal expansion and contraction of the light guide body. There is a problem that the light guide body may move toward a certain other side and come into contact with the frame, and the light guide body may be detached from the frame.

  The present invention has been made in view of these points, and an object of the present invention is to provide a flat display device and a liquid crystal display device that can reliably prevent the planar light source converter from coming off the frame.

The present invention provides a flat display panel having a substantially rectangular flat plate shape having a display area for displaying an image, a light source, and a light source from the light source directed to one main surface. A planar light source conversion body having a substantially rectangular flat plate shape for converting into planar light, the principal surface of the planar light source conversion body being disposed facing the display area of the flat display panel, and the planar light source A frame including a planar light source body that causes planar light emitted from one main surface of the converter to enter the display area of the flat display panel, and a main body having a substantially rectangular frame shape that accommodates the planar light source body And the main body portion is opposed to a central portion of the non-light incident surface of the planar light source converter with a predetermined gap between a portion opposite to the portion where the light source is disposed. A gap larger than the gap is formed between the central edge and both ends of the non-light incident surface of the planar light source converter. And expanding opposite edges by connecting edge arcuately curved so as to protrude smoothly connected so as to suppress the occurrence of luminance unevenness and the center edge and the flared edge inward It is comprised by the part.

Then, each of the planar light source body and the flat display panel is accommodated in the frame in a state where one main surface of the planar light source conversion body of the planar light source body is disposed to face the display area of the flat display panel. The At this time, the both ends of the non-light-incident surface of the planar light source conversion body located on the opposite side of the light source of the planar light source body through the gap with respect to the frame by the widened edge portion of the main body of the frame Arranged. Therefore, when the planar light source conversion body moves to the non-light incident surface side under a thermal shock, the spread edge portion of the frame absorbs the movement of the planar light source conversion body. In addition, the connection between the expanded edge and the center edge of the frame is smoothly connected by a connecting edge that is curved so as to protrude in an arc shape toward the inside. As a result, when the thermal expansion / contraction of the planar light source conversion body is absorbed by the widened edge portion of the frame, the connection edge of the frame moves from the central portion to the both end sides due to thermal expansion / contraction of the planar light source conversion body. Absorb gradually toward. For this reason, it is possible to reliably prevent the planar light source converter from coming off the frame.

According to the present invention, both ends of the non-light-incident surface of the planar light source conversion body located on the opposite side of the light source of the planar light source body are spaced from the frame by the widened edge of the main body of the frame. It is arranged via. For this reason, when the planar light source conversion body moves to the non-light-incident surface side under thermal shock, the movement of the planar light source conversion body can be absorbed by the spread edge of the frame. In addition, the connection between the expanded edge and the center edge of the frame is smoothly connected by a connecting edge that is curved so as to protrude in an arc shape toward the inside. As a result, when the thermal expansion / contraction of the planar light source conversion body is absorbed by the widened edge portion of the frame, the movement of the planar light source conversion body by the thermal expansion / contraction at the connection edge portion of the frame is shifted from the center portion to both end portions. It can be absorbed gradually. Therefore, it is possible to reliably prevent the planar light source converter from coming off from the frame.

Hereinafter, a configuration of one related technique of the liquid crystal display device of the present invention will be described with reference to FIGS.

  1 to 3, reference numeral 1 denotes a transmissive liquid crystal display device as a flat display device. This liquid crystal display device 1 is relatively large and thin with a narrow frame and excellent portability. The liquid crystal display device 1 includes a substantially rectangular flat liquid crystal display panel 2 as a transmissive flat display panel mainly used as an image display unit of a notebook personal computer (PC). The liquid crystal display panel 2 is, for example, a 12-inch diagonal type, and the light modulation layer is a liquid crystal layer (not shown).

  In addition, the liquid crystal display panel 2 includes an array substrate 3 provided in a matrix form on a surface having a thin film transistor (TFT) type (not shown) as one main surface. A counter electrode (not shown) is attached to the surface of the array substrate 3 so that the counter electrode side of the counter substrate 4 provided on one main surface is opposed to the array substrate 3. In addition, a liquid crystal layer is interposed between the array substrate 3 and the counter substrate 4 and sealed to form the liquid crystal display panel 2.

  Here, on one side edge in the height direction which is the planar direction of the liquid crystal display panel 2, a driver circuit 5 having an elongated rectangular flat plate shape as a circuit board to be driven by supplying a drive signal to the liquid crystal display panel 2. Are attached via a pair of flexible elongated printed circuit boards (Flexible Print Circuits: FPC) 6, 7. Instead of the printed wiring boards 6 and 7, the driver circuit 5 can be electrically connected through TAB (Tape Automated Bonding) (not shown).

  Further, a rectangular display screen area 8 which is a display area for displaying an image is formed at the center of the liquid crystal display panel 2. In the display screen area 8, a plurality of display pixels (not shown) are arranged in a matrix. A rectangular frame-shaped bezel cover 11 is attached to the front surface side which is one main surface of the liquid crystal display panel 2. The bezel cover 11 corresponds to the display screen area 8 of the liquid crystal display panel 2 and has a rectangular frame-shaped main body 13 having a rectangular window 12 that exposes the display screen area 8 formed in the center. I have.

  Further, an outer peripheral edge portion 14 is provided on the outer peripheral edge of the main body portion 13 to cover the edge of the liquid crystal display panel 2 when the liquid crystal display panel 2 is accommodated on the back side of the main body portion 13. . Further, a screw body 14 a for fixing the liquid crystal display panel 2 to the bezel cover 11 in a state where the liquid crystal display panel 2 is accommodated on the back side of the main body 13 is attached to the outer peripheral edge portion 14.

  On the other hand, on the back side of the liquid crystal display panel 2, a surface light source as a rectangular plate-like planar light source that allows planar light that is planar light to enter the back side of the display screen area 8 of the liquid crystal display panel 2. A backlight 15, which is a device, is mounted facing the device. The backlight 15 is accommodated in the bezel cover 11 together with the liquid crystal display panel 2 in a state where the front surface side which is one main surface of the backlight 15 is opposed to the back surface of the liquid crystal display panel 2.

  Here, the driver circuit 5 attached to the liquid crystal display panel 2 is printed with a wiring toward the back surface side of the backlight 15 with the front surface side of the backlight 15 facing the back surface side of the liquid crystal display panel 2. Each of the substrates 6 and 7 is curved and disposed on the back side of the backlight 15. At this time, an elongated rectangular sheet-like insulating sheet 21 is attached between the driver circuit 5 and the backlight 15 so as to ensure insulation between the driver circuit 5 and the backlight 15. .

  As shown in FIGS. 2 and 3, the backlight 15 includes a cold cathode tube 22 as a discharge lamp, which is an elongated cylindrical tubular light source. A lamp holder 23 formed of rubber having elasticity or the like is fitted and attached to both ends of the cold cathode tube 22. Further, one end of a cable 24 is connected to each of both ends of the cold cathode tube 22, and a housing 25 as a connector is attached to the other end of each of the cables 24.

  In addition, the light guide 26, which is a planar light source conversion body having a substantially rectangular plate shape, is disposed in parallel with the lamp-side light incident surface 26a that is one side of the outer peripheral surface of the cold cathode tube 22. It is arranged. Here, the light incident surface 26a is a planar portion that does not include a corner portion 26c between the light incident surface 26a and a surface 26b as a light emitting surface that is one main surface of the light guide 26. In addition, the light guide 26 is formed of a resin having light permeability. Furthermore, in order to enable the light guide body 26 to be thin and light, a prism (not shown) having a condensing function is provided on the back surface 26d which is a non-light emitting surface as the other main surface of the light guide body 26. This is a shaped prism light guide.

Further, the light guide 26 receives the linear light from the cold cathode tube 22 through the light incident surface 26a, and refracts the linear light into the surface toward the light guide 26 side. Then, the light is converted into a planar light source that is planar light, and the planar light is irradiated to the back side of the display screen area 8 of the liquid crystal display panel 2 and transmitted therethrough. The light guide 26 is disposed with the front surface 26b of the light guide 26 facing the back side of the display screen area 8 of the liquid crystal display panel 2. Further, the light guide 26 is caused to enter planar light emitted from the surface 26b side of the light guide 26 to the display screen area 8 of the liquid Akirahyo display panel 2.

  In addition, the light guide 26 reflects light incident from the light incident surface 26a of the light guide 26 evenly to the surface 26b of the light guide 26, and as the other side of the light guide 26. In order to secure an accommodation space on the back surface 26d side from the non-light-incident surface 26e on the non-lamp side, which is the other side, along the height direction from the light-incident surface 26a side to the non-light-incident surface 26e side It is gradually thinned in parallel.

  A light collecting sheet 27, which is a substantially rectangular sheet-like optical sheet that covers the surface 26b of the light guide 26, is attached to the surface 26b of the light guide 26 in an overlapping manner. The condensing sheet 27 condenses the planar light emitted from the surface 26b of the light guide 26. Further, on the light collecting sheet 27, a diffusion sheet 28, which is a substantially rectangular optical sheet covering the surface of the light collecting sheet 27, is overlaid and attached.

  The diffusion sheet 28 is disposed so as to face the surface opposite to the back surface of the light collecting sheet 27 facing the surface 26b of the light guide 26. Further, the diffusion sheet 28 diffuses the planar light collected by the condensing sheet 27 and then causes the planar light to enter the back surface of the display screen area 8 of the liquid crystal display panel 2. The image displayed on the display screen area 8 of the liquid crystal display panel 2 is made visible through transmission.

  Here, each of the light collecting sheet 27 and the diffusion sheet 28 improves the luminance of the planar light emitted from the surface 26b of the light guide 26, and the optical film for improving the uniformity of the luminance. It is.

  On the other hand, a reflection sheet 29, which is a rectangular sheet-like optical sheet that covers the back surface 26d of the light guide 26, is disposed and attached to the back surface 26d of the light guide 26. The reflection sheet 29 is for reflecting the light irradiated from the inside of the light guide 26 to the outside through the back surface 26d of the light guide 26 toward the front surface 26b side of the light guide 26. It is an optical film.

  The cold cathode tube 22 disposed opposite to the light incident surface 26a of the light guide 26 is, as shown in FIG. 2, a lamp reflector 31 as a sheet-like reflector curved in a substantially U shape. Covered in the circumferential direction. The lamp reflector 31 is attached so as to sandwich the light incident surface 26a of the light guide 26, and is introduced by reflecting the light from the cold cathode tube 22 and entering the light incident surface 26a of the light guide 26. Let

In addition, bent portions 35 and 36 that are bent toward the center in the height direction of the lamp reflector 31 are respectively provided at the upper end portion 33 and the lower end portion 34 that are both side portions along the width direction of the lamp reflector 31. Is provided. Further, the upper end portion 33 of the lamp reflector 31 is attached in a state of being sandwiched between the surface 26b of the light guide 26 and the light collecting sheet 27 along the longitudinal direction. That is, the lamp reflector 31 has a thickness dimension that is substantially equal to or smaller than the thickness dimension of the light collecting sheet 27. Further, the lower end portion 34 of the lamp reflector 31 has a predetermined width superimposed on the back surface 29a of the reflection sheet 29 disposed facing the back surface 26d of the light guide 26 along the longitudinal direction. The sheet 29 is disposed on the back surface 29a.

  Then, the light guide 26 having the condensing sheet 27 and the diffusion sheet 28 attached to the front surface 26b, the reflection sheet 29 attached to the back surface 26d, and the cold cathode tube 22 and the lamp reflector 31 attached to the light incident surface 26a side It is accommodated and held on the surface side which is one main surface of the substantially rectangular flat frame 40.

  Here, the frame 40 includes a main body 41 having a rectangular frame shape. In the central portion of the main body portion 41, a substantially rectangular storage opening 42 is provided in which the backlight 15 is fitted and received in the main body portion 41. On the back surface side of the inner peripheral edge of one side portion along the height direction of the housing opening portion 42, it is along the height direction on the back surface side of the backlight 15 fitted and housed in the housing opening portion 42. An elongated substantially rectangular flat plate-shaped holding piece 43 is provided for locking and holding one side. The holding piece 43 is provided along the width direction which is the longitudinal direction of the accommodation opening 42.

  Specifically, the holding piece 43 is affixed to the surface of the holding piece 43 in a state where the back surface of the PET tape 44 made of polyethylene terephthalate as a double-sided tape is aligned in the longitudinal direction. It is attached. Then, on the surface of the PET tape 44, the back surface 29a side of the one side edge portion along the height direction of the reflection sheet 29 is stuck along the width direction. Further, between the surface 29b side of the one side edge of the reflection sheet 29 and the back surface 26d on the non-light incident surface 26e side of the light guide 26, a strip-like PET tape 45 as a double-sided tape is a reflection sheet. 29 and the light guide 26 are pasted in a state where the longitudinal direction is along the width direction. Therefore, the PET tape 45 fixes the reflection sheet 29 to the back surface 26d of the light guide 26.

  On the other hand, the central portion along the longitudinal direction of the inner side surface 41a of the main body portion 41, which is the side on which the holding piece portion 43 is formed, is more than the both end portions along the longitudinal direction of the inner side surface 41a of the main body portion 41. A central edge 46 protruding toward the inside of the accommodation opening 42 is provided. The central edge 46 is a central portion 26f along the longitudinal direction of the non-light incident surface 26e of the light guide 26 of the backlight 15 in a state where the backlight 15 is accommodated in the accommodation opening 42 of the main body 41. On the other hand, the light guide 26 is disposed so as to face the height direction which is a planar direction through a gap A which is a clearance of a predetermined distance.

  Here, the inner side surface 41a of the main body 41 is a light guide that is located on the opposite side of the cold cathode tube 22 of the backlight 15 in a state in which the backlight 15 is accommodated in the accommodation opening 42 of the main body 41. 26 is one side surface of the accommodation opening 42 facing the other side along the height direction of 26.

  Further, at both end portions along the longitudinal direction of the inner side surface 41a of the main body 41, as an expanded portion that is expanded in a concave shape toward the outside of the housing opening 42 from the central edge 46 of the main body 41. An expansion recess 47, which is an expansion edge of each, is provided. These expanded recesses 47 are corner portions along the longitudinal direction of the non-light incident surface 26e of the light guide 26 of the backlight 15 in a state where the backlight 15 is accommodated in the accommodation opening 42 of the main body 41. The light guide 26 is disposed so as to face a certain end 26g through a gap B having a predetermined distance larger than the gap A in the height direction of the light guide 26.

  Here, each of these expanded recesses 47 is near both end portions 26g on the non-light incident surface 26e side of the light guide 26, so that the vicinity of both end portions 26g does not contact along the height direction of the frame 40. Both end portions of the inner side surface 41a of the main body portion 41 are cut and deleted. That is, each of the expanding recesses 47 has a structure that prevents the light guide 26 from being detached from the housing opening 42 of the frame 40 by thermal expansion and contraction of the light guide 26.

In addition, the step between the widened recess 47 and the central edge 46 is a connection part that connects the widened concave portion 47 and the central edge 46 in a tapered manner and smoothly connects them. Connection piece portions 48 are provided as edges . Each of the connection piece portions 48 is provided between the expansion recess 47 and the central edge 46 along the longitudinal direction of the inner side surface 41a of the main body 41. That is, each of the connection piece portions 48 is formed from the central portion along the longitudinal direction of the inner side surface 41a of the main body portion 41 toward the both end portions along the longitudinal direction of the inner side surface 41a. It inclines toward the other side along the height direction. Here, each of the connection piece portions 48 prevents uneven brightness of the planar light emitted from the surface 26b of the light guide 26 due to thermal expansion and contraction of the light guide 26.

Next, the operation of the one related technique will be described.

  First, electric energy is supplied to the cold cathode tube 22 through the housing 25 and the cable 24 to cause the cold cathode tube 22 to emit light.

  At this time, the linear light emitted from the cold cathode tube 22 is reflected by the inner surface of the lamp reflector 31 covering the cold cathode tube 22 and enters the light incident surface 26a of the light guide 26.

  The light incident on the light incident surface 26a of the light guide 26 is reflected by the prism formed on the back surface 26d of the light guide 26 and the reflection sheet 29 attached to the back surface 26d. The light is converted into planar light toward the surface 26b side of the light guide 26 and emitted from the surface 26b of the light guide 26.

  Thereafter, the planar light emitted from the surface 26b of the light guide 26 passes through the light collecting sheet 27 and is collected by the light collecting sheet 27, and then passes through the diffusion sheet 28 to diffuse this light. The light is diffused by the sheet 28, and the light collecting sheet 27 and the diffusion sheet 28 make the luminance of the surface 26b of the light guide 26 uniform and improved.

  Further, the planar light transmitted through each of the light collecting sheet 27 and the diffusion sheet 28 is irradiated to the back surface side of the display screen area 8 of the liquid crystal display panel 2.

  And the light irradiated to the back surface side of the display screen area 8 of this liquid crystal display panel 2 permeate | transmits the display screen area 8 of this liquid crystal display panel 2, and enters into a user's eyes, The display of this liquid crystal display panel 2 The image displayed in the screen area 8 is visually recognized by the user.

As described above, in the related technology , the backlight 15 is accommodated in the accommodation opening 42 of the frame 40, and the longitudinal direction of the non-light incident surface 26e of the light guide 26 of the backlight 15 is accommodated. A central edge portion 46 is provided in the central portion along the longitudinal direction of the inner side surface 41a of the main body portion 41 so as to be opposed to the central portion 26f via a gap A of a predetermined distance.

  Further, in this state, both ends 26g which are corners along the longitudinal direction of the non-light incident surface 26e of the light guide 26 of the backlight 15 are opposed to each other through a gap B having a predetermined distance larger than the gap A. The widened recesses 47 to be disposed are provided at both end portions along the longitudinal direction of the inner side surface 41a of the main body 41.

  Here, when the expanding recess 47 is not provided as in the prior art, the gap between the inner side surface 41a of the frame 40 and the non-light-incident surface 26e of the light guide 26 is used as a countermeasure against the thermal shock. It is configured to be smaller than the amount of pinching on the lower end side.

  Therefore, when a thermal shock test, which is a temperature cycle test of an environmental test, is performed, the light guide 26 is thermally expanded and contracted, and as shown in FIG. 26 moves toward the non-light incident surface side. At this time, as shown in FIG. 6, the central part 26f of the non-light-incident surface 26e of the light guide 26 has a beam-shaped central part of the main body part 41 of the frame 40, and the central part bends outward. Therefore, it is difficult to remove from the accommodation opening 42 of the frame 40.

  On the other hand, since the thermal expansion / contraction rate of both end portions 26g on the non-light incident surface 26e side of the light guide 26 is particularly large, both end portions 26g on the non-light incident surface 26e side of the light guide 26 are accommodated in the frame 40. The both ends 26g of the light guide 26 on the non-light incident surface 26e side are in contact with the inner side surface 41a of the frame 40 in contact with the inner side surface 41a of the opening 42, and as a result, this frame There is a risk that defects such as the light guide 26 coming off from the 40 accommodating openings 42 may occur.

  Further, since the fixing by the PET tapes 44 and 45 becomes strong at a low temperature, the light guide 26 is pulled toward the non-light incident surface 26e due to the contraction of the light guide 26 as shown in FIG. There is a risk of being moved.

However, in the related technology described above, the expanding recesses 47 are provided at both ends of the inner side surface 41a of the housing opening 42 of the frame 40, respectively. As a result, even when the light guide 26 is moved to the non-light-incident surface 26e side due to the thermal expansion and contraction of the light guide 26, the movement of the light guide 26 is caused by the expansion recess 47 of the frame 40. Can absorb. Therefore, it is possible to reliably prevent the light guide 26 from coming off or coming off from the housing opening 42 of the frame 40.

  Further, a connection piece 48 is provided at each step between the expanding recess 47 and the central edge 46 of the frame 40, and the expanding recess 47 and the central edge 46 are smoothly connected in a tapered shape. It was. As a result, when the thermal expansion / contraction of the light guide 26 is absorbed by the expanding recess 47 of the frame 40, the movement of the light guide 26 by the thermal expansion / contraction by the connection piece 48 of the frame 40 is changed from the central portion 26f to both ends. It can be absorbed gradually toward the 26g side.

Therefore, since it is possible to prevent the light guide 26 from coming off from the frame 40 due to thermal expansion and contraction while preventing the occurrence of uneven brightness, while maintaining the brightness and quality of the light guide 26, an out-of-frame 40 due to thermal expansion and contraction of this light guide 26 can be prevented. As a result, it is possible to obtain the liquid crystal display device 1 that can maintain high luminance and high quality without leaking light from the cold cathode tube 22, and maintain screen quality even in a temperature cycle environment as compared with the prior art.

In the one related technique , the connection piece 48 is provided in the step portion between the expanded recess 47 and the central edge 46 of the frame 40, and the gap between the expanded recess 47 and the central edge 46 is provided. as it was smoothly connected to the tapered, as in the embodiment shown in FIG. 4, protruding in an arc shape toward the each of the connecting pieces 48 on the inner side of the receiving opening 42 of the main body portion 41 Even when the shape is curved to the R shape, the same effect as the one related technique can be obtained. Here, these connecting piece portions 48 connect the stepped portions between the expanded concave portion 47 and the central edge portion 46 of the frame 40 with curved lines that are smoothly curved in parallel along the thickness direction.

Further, in the above embodiment, mounting the backlight 15 on the rear surface of the liquid crystal display panel 2, and transmits light from the backlight 15 from the back side of the display screen area 8 of the liquid crystal display panel 2 to the surface side transparent In the liquid crystal display device 1 of the type or transflective type, a front light is attached as a planar light source on the surface side of the display screen area 8 of the liquid crystal display panel 2, and light from the front light is transmitted to the liquid crystal display panel 2. A reflective liquid crystal display device 1 that is incident on the surface side of the display screen area 8 and reflects it can also be used.

  Further, the liquid crystal display panel 2 using amorphous silicon (a-Si) or polysilicon (p-Si) can be used, and the liquid crystal display device 1 having a diagonal size of about 10.4 to 15 inches can be used. It can also be used correspondingly.

It is explanatory front view which shows one related technique of the flat display apparatus of this invention. It is explanatory sectional drawing which shows a flat display apparatus same as the above. It is a disassembled perspective view which shows a flat display apparatus same as the above. It is explanatory front view which shows the flat display apparatus of one embodiment of this invention. It is explanatory sectional drawing which shows the state at the time of the high temperature of the conventional flat display apparatus. It is explanatory front view which shows the state at the time of high temperature of a flat display apparatus same as the above. It is explanatory sectional drawing which shows the state at the time of the low temperature of a flat display apparatus same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid crystal display device as a flat display device 2 Liquid crystal display panel as a flat display panel 8 Display screen area as a display area
15 Backlight as a planar light source
22 Cold cathode tube as light source
26 Light guide as a planar light source converter
26a Light incident surface as one side
26e non- light incident surface
26f center
26g end
40 frames
41 Main unit
46 Center edge
47 Widening recess as widening edge
48 Connection piece as connection edge A gap B gap

Claims (2)

A flat display panel having a substantially rectangular flat plate shape having a display area for displaying an image;
A light source, and a surface light source conversion body having a substantially rectangular plate shape that is disposed with one side facing the light source and converts light from the light source into surface light directed to one main surface. One main surface of the light source conversion body is disposed to face the display area of the flat display panel, and planar light emitted from one main surface of the planar light source conversion body is directed to the display area of the flat display panel. A planar light source to be incident;
A frame having a substantially rectangular frame-shaped main body that accommodates the planar light source body;
The main body has a central edge portion opposite to a portion where the light source is disposed and a central portion of a non-light incident surface of the planar light source converter with a predetermined gap therebetween, A widening edge portion that is opposed to both ends of the non-light incident surface of the planar light source conversion body via a gap larger than the gap, and is curved so as to protrude in an arc shape inward. A flat display device comprising: an open edge portion and a connecting edge portion that smoothly connects the central edge portion so as to suppress occurrence of luminance unevenness . Comprising the flat display device according to claim 1 ;
A flat display panel of the flat display device is a liquid crystal display panel.

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