JP2014038318A - Liquid crystal display device and television receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display device and a television receiver that prevent light emitted from a backlight from leaking from a peripheral part of a liquid crystal panel to the front side, and can contribute to the higher quality of an image displayed on the front surface of the liquid crystal panel.SOLUTION: A backlight 2 housing a rectangular flat light guide plate 21 and an LED light source 22 facing a lower end 21a of this light guide plate 21 in a backlight chassis 20 is disposed to face a back surface of a liquid crystal panel 1. An upper light-blocking plate 3 is interposed between an upper end 21b of the light guide plate 21 and a side wall of the backlight chassis 20, and by covering the upper end 21b of the light guide plate 21 with this upper light-blocking plate 3, the light in the light guide plate 21 can be prevented from leaking out to the outside.

Description

  The present invention relates to a liquid crystal display device and a television receiver including a liquid crystal panel as an image display unit.

  The liquid crystal display device is configured such that a backlight is disposed on the back surface of the liquid crystal panel, the light emission of the backlight is modulated by the liquid crystal panel and transmitted, and an image is displayed on the front surface of the liquid crystal panel. In recent years, in this liquid crystal display device, an edge light type backlight using an LED (light emitting diode) as a light source has been adopted in order to achieve both reduction in power consumption and reduction in thickness (for example, Patent Documents). 1).

  The edge light type backlight is configured by accommodating a light guide plate and a light source in a rectangular dish-shaped casing (backlight chassis). The light guide plate is formed by attaching a reflective sheet to one surface of a resin-made flat plate having translucency, with the reflective sheet attached surface facing the bottom surface of the backlight chassis and the backlight chassis covering the bottom surface. Is housed in.

  A plurality of LEDs as a light source are mounted in a single or double row on a long and short LED board, and mounted on the backlight chassis with the mounting surface facing one side edge of the light guide plate. The light emitted from each LED enters the light guide plate through the opposing side edges, propagates repeatedly through total reflection on one reflection sheet and partial reflection on the other surface, and is emitted from the entire other surface. The liquid crystal panel is laminated on the other surface of the light guide plate via an optical sheet, and the light emitted from the light guide plate is diffused by the action of the optical sheet and irradiated to the back surface of the liquid crystal panel.

  In the liquid crystal display device configured in this way, a part of the light emitted from the light source directly enters the peripheral side of the liquid crystal panel without passing through the light guide plate, leaks out to the front side of the liquid crystal panel, and There is a problem that the quality of the image displayed on the front surface is lowered. In order to cope with this problem, conventionally, a configuration is adopted in which a light shielding member is disposed along the side edge of the liquid crystal panel on the same side as the light source, and leakage light from the light source is blocked by the action of the light shielding member. (For example, refer to Patent Document 2).

International Publication No. 2008/108039 Pamphlet Japanese Patent Laid-Open No. 2001-117097

  On the other hand, the light emitted from the light source propagates throughout the interior of the light guide plate, and most of this light guide is applied to the liquid crystal panel as described above, but part of the light guide is on the remaining side not facing the light source. The light reaches the edge and is emitted to the outside. Like the light emission of the light source, the liquid crystal panel leaks from the corresponding peripheral edge to the front side, which may cause deterioration in the quality of the display image.

  Since the influence of this leaking light is smaller than the direct leaking light from the light source, in the prior art, a frame-like shape that is mounted so as to border the peripheral portion of the surface (image display surface) of the liquid crystal panel. Only measures are taken to prevent leakage of light from the front cabinet.

  However, the front cabinet is a resin frame that holds the liquid crystal panel from the front side, and there is a local gap between the surface of the liquid crystal panel, and it is inevitable that light leaks through this gap. It is not possible to expect a good shading effect.

  Further, in recent liquid crystal display devices, the design property is improved by narrowing the width of the portion (frame portion) that borders the display surface of the liquid crystal panel of the front cabinet. In the display device, the light shielding effect by the front cabinet is further reduced, and it is difficult to prevent the image quality from being deteriorated by the leaked light.

  Furthermore, in a liquid crystal display device with a narrowed frame, the overlap width between the side edges of the liquid crystal panel and the front cabinet tends to be uneven, and a lot of leaking light is generated in the portion where the overlap width is small. There is a risk of further degradation of image quality.

  The present invention has been made in view of such circumstances, and the light emitted from the backlight is reliably prevented from leaking from the peripheral portion of the liquid crystal panel to the front side by a simple configuration, and is displayed on the front surface of the liquid crystal panel. An object of the present invention is to provide a liquid crystal display device and a television receiver that can contribute to the improvement of image quality.

  In the liquid crystal display device according to the present invention, a backlight having a light guide plate having a rectangular flat plate shape and a light source opposed to one side edge of the light guide plate is disposed in the casing so as to face the back surface of the liquid crystal panel. In the liquid crystal display device that modulates and transmits the light emitted from one surface of the light guide plate by the liquid crystal panel and displays an image on the front surface of the liquid crystal panel, the other side edge of the light guide plate and the other side edge A light shielding member is provided between the opposite side walls of the housing and covers the other side edge.

  In the present invention, the side edge of the light guide plate excluding the side edge facing the light source is covered with a light shielding member interposed between the side edge and the side wall of the housing, and the inside of the light guide plate is caused by the action of the light shielding member. To prevent leakage to the outside. The light emitted from the backlight does not leak from the peripheral edge of the liquid crystal panel to the front side, and the display image quality can be prevented from deteriorating due to the leaked light.

  Further, in the liquid crystal display device according to the present invention, the light shielding member is capable of relative movement in a direction in which the abutting plate abuts against the other side edge of the light guide plate and the side wall of the housing, and a direction in which the both abutting plates are contacted and separated. And a connecting plate for connecting to the head.

  In the present invention, the contact plate is brought into close contact with the other side edge of the light guide plate by the urging action of the connecting plate, and the other side edge is covered with a corresponding plate without any gap, thereby reliably preventing light leakage in the light guide plate. To do. The contact plate that is in close contact with each side edge functions as a positioning means for the light guide plate in the housing, and also functions to absorb the thermal expansion of the light guide plate by the action of the connecting plate. The relationship can always be kept appropriate and the quality of the display image on the liquid crystal panel can be kept good by reliable light irradiation.

  In addition, the liquid crystal display device according to the present invention includes a cover plate that is connected to a contact plate that contacts the other side edge of the light guide plate and covers a peripheral portion of one surface of the light guide plate.

  In the present invention, since one surface of the peripheral portion of the light guide plate is covered with a cover plate that is continuous with the contact plate, leakage of light from the peripheral portion of the light guide plate is more reliably prevented, and the quality of the display image of the liquid crystal panel Can be kept good.

  In the liquid crystal display device according to the present invention, the liquid crystal display device is connected to a contact plate contacting the other side edge of the light guide plate, elastically contacts the rear peripheral edge of the liquid crystal panel, and the peripheral edge is away from the light guide plate. An urging plate for urging the pressure is provided.

  In the present invention, the urging plate continuing to the contact plate presses and urges the rear peripheral edge of the liquid crystal panel in the direction away from the pressing plate. The liquid crystal panel is pressed against and adhered to a frame-shaped front cabinet that covers the front peripheral edge. This eliminates as much as possible the gap generated between the front cabinet and the liquid crystal panel due to molding error, assembly error, deformation during use, etc., and the light leaking to the front side of the liquid crystal panel through this gap Can be further reduced, and the display image quality of the liquid crystal panel can be kept good.

  Furthermore, a television receiver according to the present invention includes any one of the above-described liquid crystal display devices and a receiving unit that receives a television broadcast, and based on the television broadcast received by the receiving unit, An image is displayed on the liquid crystal display device.

  In the present invention, it is possible to provide a television receiver that can suppress a deterioration in the quality of a display image caused by light leaked from the periphery of a liquid crystal panel.

  In the present invention, since the side edge of the light guide plate not facing the light source is covered with a light shielding member, light leaking from the peripheral edge of the liquid crystal panel to the front side is suppressed to a small extent, contributing to the improvement of the image quality of the liquid crystal panel. The present invention has excellent effects such as being able to do so.

1 is a perspective view schematically showing an appearance of a liquid crystal display device according to Embodiment 1. FIG. It is a longitudinal cross-sectional view by the II-II line of FIG. It is a perspective view of the upper light-shielding plate which covers the upper edge of a light-guide plate. FIG. 4 is a transverse sectional view taken along line IV-IV in FIG. 1. It is a perspective view of the side part light-shielding plate which covers the left and right side edges of a light-guide plate. 6 is a perspective view of a side light shielding plate and an upper light shielding plate according to Embodiment 2. FIG. It is explanatory drawing of the positional relationship of the side part light-shielding plate shown in FIG. 6 is a perspective view of a side light shielding plate according to Embodiment 3. FIG. It is operation | movement explanatory drawing of the side part light-shielding plate shown in FIG. It is operation | movement explanatory drawing of the side part light-shielding plate shown in FIG.

Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments thereof.
(Embodiment 1)
FIG. 1 is a perspective view schematically showing the appearance of the liquid crystal display device according to Embodiment 1, and FIG. 2 is a longitudinal sectional view taken along the line II-II in FIG. As shown in the figure, the liquid crystal display device includes a liquid crystal panel 1 for image display and a backlight 2 for irradiating the liquid crystal panel 1 with light.

  The liquid crystal panel 1 has a known configuration in which liquid crystal is sealed between an array substrate and a color filter substrate, and polarizing plates are laminated on both surfaces thereof. A front cabinet 10 having a rectangular frame shape is assembled to the liquid crystal panel 1 so that the peripheral edge of the front surface (image display surface) is bordered over an appropriate width. FIG. 2 schematically shows the liquid crystal panel 1 as described above as a rectangular plate-like panel. FIG. 1 shows only the image display surface of the liquid crystal panel 1 exposed in the frame of the front cabinet 10. The back side of the liquid crystal panel 1 is covered with a backlight chassis 20 that constitutes the outer casing of the backlight 2. The backlight chassis 20 is assembled on the back side of the front cabinet 10 as described later, and constitutes an exterior body of the liquid crystal display device.

  The liquid crystal display device shown in FIG. 1 can be configured as a television receiver including a receiving unit 11 and a signal processing unit 12 attached to the back surface of the backlight chassis 20. The receiving unit 11 is connected to an antenna (not shown) and receives a television broadcast via the antenna. The signal processing unit 12 demodulates data related to television broadcasting received by the receiving unit 11, separates image data from the demodulated data, and outputs the separated image data. The liquid crystal panel 1 displays an image based on the image data output from the signal processing unit 12 on the image display surface.

  The liquid crystal display device further includes a stand 13. The stand 13 is provided with a leg portion formed in an H shape so as to extend substantially perpendicular to the leg column at the tip end of the leg column projecting vertically from the center of one long side of the backlight chassis 20. Become. The liquid crystal display device is supported on a mounting surface via a stand 13 and used while maintaining the image display surface of the liquid crystal panel 1 in a vertical posture. In the following description, the side of the image display surface of the liquid crystal panel 1 is the front, and the other side is the rear. Moreover, the upper and lower used in the following description correspond to the upper and lower in the above-described use state, and the left and right correspond to the left and right when viewed from the front side in the use state.

  As shown in FIG. 2, the backlight 2 includes a backlight chassis 20, a light guide plate 21, and an LED light source 22. The backlight chassis 20 is a metal casing that is formed in a shallow dish shape by raising a peripheral edge of a rectangular bottom plate substantially vertically to surround a short side wall. The light guide plate 21 is an optical member formed by attaching a reflection sheet 23 to one surface of a resin-made flat plate such as an acrylic resin, and is formed into a rectangle slightly smaller than the liquid crystal panel 1. Is attached to the backlight chassis 20 so as to cover the substantially entire surface of the bottom plate.

  The LED light source 22 is formed by mounting an LED 25 on one surface of a substrate 24. The LED 25 is, for example, a surface-mounted LED in which the surface of an LED element that emits blue light is sealed with a resin in which a yellow phosphor is dispersed, and is configured as a light source that emits white light. The LED light source 22 is mounted by fixing a substrate 24 to a heat sink 26 that is held between the backlight chassis 20 and the front cabinet 10 as described later, with the mounting surface of the LED 25 facing the lower edge 21 a of the light guide plate 21. is there. The substrate 24 has a long strip shape having a length corresponding to the lower edge 21 a of the light guide plate 21, and a plurality of LEDs 25 are mounted side by side in the longitudinal direction of the substrate 24. In FIG. 2, a cross section of the substrate 24 is shown together with one LED 25 mounted on the substrate 24.

  The upper edge 21b of the light guide plate 21 faces the upper side wall of the backlight chassis 20, and the upper light shielding plate 3 is interposed between these opposed surfaces. FIG. 3 is a perspective view of the upper light shielding plate 3. The upper light shielding plate 3 is configured by connecting one side of two contact plates 30 and 31 by a connection plate 32, and as shown in FIG. 2, one contact plate 30 is attached to the upper side wall of the backlight chassis 20. The other abutting plate 31 is brought into contact with the upper edge 21b of the light guide plate 21, and the connecting side by the connecting plate 32 is interposed toward the bottom plate side of the backlight chassis 20.

  The contact plate 31 is a flat plate having a width corresponding to the upper edge 21b of the light guide plate 21 to be contacted and extending over the entire length of the upper edge 21b. The contact plate 30 is also a flat plate having substantially the same width and length, and the connection plate 32 connects the side edges of these contact plates 30 and 31 on the same side in the width direction.

  As shown in FIG. 3, the connecting plate 32 is continuous to the vertical plate portion that rises vertically from the side edge of the one plate 30 toward the other plate 31, and the leading edge of the vertical plate unit, and is connected to the other side. An elastic plate portion extending obliquely toward the side edge and folded back in a reverse direction at a position substantially the same width as the contact plates 30 and 31 and continuing to one side edge of the other contact plate 31 is provided.

  A cover plate 31 a is connected to the other side edge of the backing plate 31. The cover plate 31a rises from the contact plate 31 in a direction substantially perpendicular to the other contact plate 30, and when the upper light shielding plate 3 is interposed as shown in FIG. 2, the front surface near the upper edge 21b of the light guide plate 21 Is provided so as to cover the entire width.

  The upper light shielding plate 3 as described above can be easily manufactured as an integrally molded product of resin continuous over the entire length by extrusion molding using a hole mold corresponding to the cross section shown in FIG. By being interposed, the contact plate 31 covers the upper edge 21b of the light guide plate 21, and the corresponding cover plate 31a continuing to the plate 31 covers the front surface of the light guide plate 21 in the vicinity of the upper edge 21b. It blocks the light inside and prevents leakage from the upper edge 21b and the front surface in the vicinity of the upper edge 21b.

  FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 1 and shows the internal structure of the right portion of the liquid crystal display device. The right side edge 21c of the light guide plate 21 shown in this figure faces the right side wall of the backlight chassis 20, and the side light shielding plate 4 is interposed therebetween. FIG. 5 is a perspective view of the side light shielding plate 4. Similar to the upper light shielding plate 3, the side light shielding plate 4 includes two contact plates 40, 41 and a connecting plate 42 that connects one side thereof, and the contact plate 40 is attached to the right side wall of the backlight chassis 20. The other contact plate 41 is in contact with the right edge 21 c of the light guide plate 21, and the connection side by the connection plate 42 is interposed toward the bottom plate side of the backlight chassis 20.

  The contact plates 40 and 41 are flat plates having a width and a length corresponding to the right edge 21 b of the light guide plate 21. The connecting plate 42 that connects one side edge of the contact plates 40 and 41 extends obliquely from one side edge of the contact plate 40 toward the other side edge, and reverses at a position substantially the same width as the contact plates 40 and 41. It is configured as an elastic plate portion that is folded back and has a shape that is continuous with one side edge of the other contact plate 41.

  Further, a cover plate 41 a is continuously provided on the other side edge of the contact plate 41 so as to rise substantially vertically in the opposite direction to the other contact plate 40. When the side light shielding plate 4 is interposed as shown in FIG. 4, the cover plate 41a abuts on the front surface of the light guide plate 21 in the vicinity of the right edge 21c and is provided so as to cover an appropriate width. .

  The side light-shielding plate 4 as described above is easily manufactured as an integrally molded product of resin continuous over the entire length by extrusion molding using a hole mold corresponding to the cross section shown in FIG. can do. By interposing the side light-shielding plate 4 as described above, the right edge 21c of the light guide plate 21 is covered with the contact plate 41, and the front surface of the light guide plate 21 in the vicinity of the right edge 21c is continuous with the contact plate 41. Since it is covered with the cover plate 41a, the light in the light guide plate 21 can be prevented from leaking from the right edge 21c of the light guide plate 21 and the front surface of the light guide plate 21 in the vicinity of the right edge 21c. The side light shielding plate 4 is also interposed on the left side edge of the light guide plate 21 (not shown), and the light in the light guide plate 21 is not likely to leak from the vicinity of the left side edge of the light guide plate 21.

  As shown in FIG. 2, the liquid crystal display device has a front surface that covers the front surface of the liquid crystal panel 1 by superimposing the liquid crystal panel 1 on the front surface of the light guide plate 21 of the backlight 2 configured as described above via the optical sheet group 14. A flange extending rearward on the periphery of the cabinet 10 is fitted to the outside of the side wall of the backlight chassis 20, and a corresponding position of the backlight chassis 20 is fixed to a fixing boss 15 protruding rearward from the front cabinet 10. The liquid crystal panel 1 and the light guide plate 21 are sandwiched between the front cabinet 10 and the backlight chassis 20 by assembling a plurality of fixing bolts 16 (only one is shown).

  The LED light source 22 arranged at the lower part of the backlight chassis 20 includes a portion of the heat sink 26 to which the substrate 24 is fixed sandwiched between the boss portion 15 and the bottom plate of the backlight chassis 20, and is tightened with a fixing bolt 16. The LED 25 is mounted so that the mounting surface of the LED 25 faces the lower edge 21a of the light guide plate 21 as described above. By this attachment, the heat sink 26 is brought into close contact with the metal backlight chassis 20, and the heat generated by the LED 25 of the LED light source 22 due to light emission is transmitted to the backlight chassis 20 through the substrate 24 and the heat sink 26, Heat is radiated from the rear surface of the backlight chassis 20 to the outside.

  The light emission of each LED 25 of the LED light source 22 enters the light guide plate 21 through the lower edge 21a facing each other, and is totally reflected on the reflection sheet 23 attached to the rear surface inside the light guide plate 21 and on the front surface. The partial reflection proceeds repeatedly, and is distributed and emitted over the entire front surface of the light guide plate 21. The emitted light is diffused by the optical sheet group 14 and irradiated on the back surface of the liquid crystal panel 1, and the liquid crystal panel 1 modulates and transmits the irradiation light from the backlight 2 by driving the liquid crystal enclosed therein, Display an image on the front.

  The light traveling in the light guide plate 21 reaches the upper edge 21 b, but the upper edge 21 b is covered with the contact plate 31 of the upper light shielding plate 3, and the light reaching the upper edge 21 b is reflected on the upper light shielding plate 3. The light is shielded without leaking to the outside due to the action. The upper light shielding plate 3 includes a cover plate 31a connected to the contact plate 31, and the cover plate 31a covers the front surface of the light guide plate 21 in the vicinity of the upper edge 21b, so that the light guide plate in the vicinity of the upper edge 21b. Leakage of light to the front of 21 can also be prevented.

  Light traveling in the light guide plate 21 also reaches the right edge 21c and the left edge (not shown), but the side light shielding plate 4 having the same configuration as the upper light shielding plate 3 is arranged on the right edge 21c and the left edge. The light reaching the right edge 21 c and the left edge is reliably shielded without leaking to the outside by the action of the side light shielding plate 4.

  The upper light shielding plate 3 and the side light shielding plate 4 include connection plates 32 and 42 that are partially or entirely configured as elastic plate portions, and the contact plates 31 and 41 are attached by the elasticity of the connection plates 32 and 42. As a result, the light guide plate 21 is closely attached to the side edges (the upper edge 21b, the right edge 21c, and the left edge) of the light guide plate 21 without any gaps, so that leakage of light from each side edge can be reliably prevented.

  As shown in FIG. 2, a lower light shielding plate 5 is provided in front of the LED light source 22 disposed opposite to the lower edge 21a of the light guide plate 21 so as to block between the light guide plate 21 and the back surface of the liquid crystal panel 1. And is configured to prevent direct leakage of light emission from the LED light source 22. The lower light-shielding plate 5 has a known configuration that is also employed in the above-described Patent Document 2.

  In the liquid crystal display device of the first embodiment, not only light leaks directly from the LED light source 22, but also light from the other side edges (upper edge 21b, right edge 21c and left edge) of the light guide plate 21. The leakage of the display image can be surely prevented, and the deterioration of the display image generated when the leaked light illuminates the corresponding peripheral portion of the liquid crystal panel 1 can be suppressed, and a good image quality can be ensured. .

  Further, the upper light shielding plate 3 and the side light shielding plate 4 pressed against the light guide plate 21 by the elasticity of the connecting plates 32 and 42 function to position the light guide plate 21 in the backlight chassis 20 upward, downward, left, and right. Therefore, when the liquid crystal display device is assembled, the light guide plate 21 and the liquid crystal panel 1 can be easily aligned.

  Further, the LED light source 22 of the backlight 2 generates heat with light emission. Most of the generated heat is radiated to the outside through the heat sink 26 as described above, but a part of the generated heat stays in the backlight chassis 20 to heat the light guide plate 21 and heat the light guide plate 21. Causes swelling. The upper light shielding plate 3 and the side light shielding plate 4 interposed around the light guide plate 21 absorb thermal expansion of the light guide plate 21 due to elastic deformation of the connecting plates 32 and 42, and the light guide plate 21 is deformed and displaced. The backlight 2 can continue stable light irradiation over a long period of time.

  As shown in FIG. 2, the vertical plate portion provided on the connecting plate 32 of the upper light shielding plate 3 forms a recess opening forward and is connected to the upper edge 21b of the liquid crystal panel 1 via a lead. It is provided to secure an accommodation space for an FPC (Flexible Printed Circuit) substrate 17 for driving the liquid crystal. The FPC board 17 is also connected to the lower edge 21a of the liquid crystal panel 1 in the same manner. The FPC board 17 is pulled out to the outside of the backlight chassis 20, and the rear surface of the backlight chassis 20 is covered with the board cover 18. Is fixed.

  When the liquid crystal panel 1 in which the FPC board 17 is also connected to the left and right side edges is used, the side light shielding plate 4 interposed on the same side is formed in the same shape as the upper light shielding plate 3. Can respond.

(Embodiment 2)
6 is a perspective view of the side light-shielding plate and the upper light-shielding plate according to the second embodiment, and FIG. 7 is an explanatory diagram of the positional relationship between the side light-shielding plate and the upper light-shielding plate shown in FIG.

  FIG. 6 shows a part of the upper light-shielding plate 3 and the side light-shielding plate 4 together with the corner portion between the upper edge 21b and the right edge 21c of the light guide plate 21. Similar to the side light shielding plate 4 shown in the first embodiment, the side light shielding plate 4 includes two contact plates 40 and 41 and a connecting plate 42 for connecting one side thereof, and the contact plate 41 is connected to the light guide plate. The right side edge 21c is attached to the right side edge 21c so as to cover the entire length of the right side edge 21c over the entire length.

  The side light-shielding plate 4 according to the second embodiment further includes a pressing plate 43 that is connected to the upper end of the pressing plate 41, and an upper pressing plate 44 that is connected to the pressing plate 43 via a connecting plate 45. It has. The holding plate 43 is a short plate that forms a right angle with the contact plate 41 and extends from the upper end of the plate 41 to the left side (the opposite side of the contact plate 40 and the connecting plate 42). The upper support plate 44 is a plate of the same size that is substantially parallel to the presser plate 43, and the connecting plate 45 extends obliquely upward from one side edge of the presser plate 43 and continues to the other side edge of the upper plate 44. It is comprised as an elastic board part which has.

  Unlike the upper light-shielding plate 3 shown in the first embodiment, the upper light-shielding plate 3 includes a single plate 31 and cover plates 31a and 31b that extend from one side edge of the plate 31 in both directions. The contact plate 31 is attached to the upper edge 21b of the light guide plate 21 so as to cover the entire length of the upper edge 21b over the entire length.

  At this time, the cover plate 31a extending downward covers the front surface of the light guide plate 21 in the vicinity of the upper edge 21b over an appropriate width, and prevents the light from leaking forward from the peripheral portion of the light guide plate 21. The cover plate 31b extending upward covers the space between the upper side of the backlight chassis 20 and the upper edge of the light guide plate 21 from the front side, and prevents leakage light into the space from leaking further forward. Make.

  As shown in FIG. 7, the presser plate 43, the upper cover plate 44, and the connecting plate 45 included in the side light shield plate 4 are interposed between the contact plate 31 of the upper light shield plate 3 and the upper wall of the backlight chassis 20. The At this time, the presser plate 43 abuts on the upper surface of the abutting plate 31, and the connecting plate 45 acts to press the retainer plate 43 and the upper abutting plate 44 against the respective abutting portions by its elasticity.

  The side light-shielding plate 4 located on the left side of the light guide plate 21 also has the same configuration. The light guide plate 21 is vertically moved by the presser plate 43, the upper plate 44, and the connecting plate 45 that are interposed at the left and right ends. Positioned. The connecting plate 45 that connects the presser plate 43 and the upper cover plate 44 has elasticity as described above, and absorbs the thermal expansion of the light guide plate 21 to prevent the light guide plate 21 from being displaced. The backlight 2 can continue stable light irradiation over a long period of time.

  Further, since the presser plate 43 is pressed against the upper surface of the contact plate 31 of the upper light shielding plate 3, there is no gap between the plate 31 and the upper edge 21 b of the light guide plate 21. Can be surely prevented. As described in the first embodiment, the side light shielding plate 4 provided on each side is pressed against the right edge 21c and the left edge of the light guide plate 21, and light leakage from each side edge is caused. Can be reliably prevented. Therefore, also in the second embodiment, it is possible to suppress the deterioration in the quality of the display image that occurs when the leaked light illuminates the corresponding peripheral edge of the liquid crystal panel 1. Further, in the second embodiment, the upper light shielding plate 3 which is a long member covering the upper edge 21b of the light guide plate 21 can be formed into a simple shape having a T-shaped cross section as shown in FIG.

(Embodiment 3)
FIG. 8 is a perspective view of the side light shielding plate according to the third embodiment, and FIGS. 9 and 10 are operation explanatory views of the side light shielding plate shown in FIG.

  FIG. 8 shows a part of the side light shielding plate 4 that covers the right edge 21 c of the light guide plate 21. Similar to the side light shielding plate 4 shown in the first embodiment, the side light shielding plate 4 includes two contact plates 40 and 41 and a connecting plate 42 that connects one side of them, and guides the contact plate 41. It is attached to the right edge 21c of the optical plate 21 so as to cover the entire surface of the right edge 21c over the entire length.

  Further, a cover plate 41 a is continuously provided on the other side edge of the contact plate 41 so as to rise substantially vertically in the opposite direction to the other contact plate 40. When the side light shielding plate 4 is interposed as shown in FIGS. 9 and 10, the cover plate 41a comes into contact with the peripheral edge portion of the light guide plate 21 near the right edge 21c from the front surface and covers the appropriate width. It is provided as follows.

  Further, the side light shielding plate 4 according to the third embodiment includes an urging plate 46. As shown in FIG. 8, the urging plate 46 is substantially parallel to the cover plate 41a at the front position of the abutting plate 41, and is connected to the tip of the cover plate 41a via a connecting plate 47. The connecting plate 47 is configured as an elastic plate portion that extends obliquely forward from the distal end portion of the cover plate 41a toward the base portion.

  As in the first embodiment, the side light-shielding plate 4 is mounted so that the right edge 21c of the light guide plate 21 is covered with the contact plate 41, and the front peripheral edge of the light guide plate 21 is covered with the cover plate 41a. 21 acts to prevent light leaking from the right edge 21c of 21 and the vicinity of the right edge 21c. At this time, as shown in FIGS. 9 and 10, the urging plate 46 is brought into contact with the rear peripheral portion of the liquid crystal panel 1 facing the front of the light guide plate 21 through the optical sheet group 14 stacked on the rear surface. The biasing plate 46 is pressed against the back surface of the liquid crystal panel 1 by the elasticity of the connecting plate 47, and the liquid crystal panel 1 is pressed and biased in a direction away from the light guide plate 21.

  The front surface of the liquid crystal panel 1 is brought into contact with the inner peripheral edge of the front cabinet 10, and the front portion that holds the molding error of the resin front cabinet 10, the liquid crystal panel 1, and the light guide plate 21 at this contact portion. A gap may occur due to assembly errors of the cabinet 10 and the backlight chassis 20, and further due to thermal deformation of the front cabinet 10 in use. On the other hand, in the peripheral portion of the liquid crystal panel 1, there is an unavoidable region that does not function as an image display unit and is capable of transmitting light. A part of the light emitted from the front surface of the light guide plate 21 is as shown in FIG. As indicated by a broken arrow in the drawing, when the gap reaches the front side of the liquid crystal panel 1 through the light-transmitting region at the peripheral edge, and the gap described above exists, the peripheral edge of the liquid crystal panel 1 passes through this gap. May illuminate from the surface side, leading to a reduction in the quality of the displayed image.

  In the side light shielding plate 4 according to the third embodiment, the urging plate 46 connected to the contact plate 41 is in elastic contact with the back surface of the liquid crystal panel 1. When the gap described above is generated, the liquid crystal panel 1 is displaced toward the front cabinet 10 by the pressing bias of the biasing plate 46 due to the elasticity of the connecting plate 47 as shown in FIG. The contact state can be maintained, light leakage through the gap can be reduced as much as possible, and deterioration in display image quality due to the leakage light can be prevented.

  The urging plate 46 is not limited to the configuration shown in FIGS. 8 to 10, and is connected to the contact plate 41 that covers the right edge 21 b of the light guide plate 21, and elastically contacts the rear peripheral edge of the liquid crystal panel 1. As long as the peripheral edge can be pressed and biased in a direction away from the light guide plate 21, it can be provided with an appropriate configuration. The urging plate 46 is preferably provided so as to be continuous over the entire length of the abutting plate 41, but a plurality of urging plates 46 having an appropriate length are arranged in parallel in the longitudinal direction of the abutting plate 41. Also good.

  The urging plate 46 as described above is similarly provided on the side light shielding plate that covers the left edge of the light guide plate 21 and the upper light shielding plate 3 that covers the upper edge 21 b of the light guide plate 21. The urging plate 46 is similarly provided on the lower light-shielding plate 5 (see FIG. 2) arranged along the lower edge 21a of the light guide plate 21. As a result, light leaking from the gap between the front cabinet 10 and the liquid crystal panel 1 can be reduced and image display with good quality can be performed.

  It should be understood that the embodiments disclosed in this specification are illustrative and non-restrictive in every respect. The scope of the present invention is defined by the terms of the claims, rather than the meanings described above, and is intended to include any modifications that are equivalent in scope to the claims.

1 Liquid crystal panel 2 Back light 3, 4 Shading plate (shading member)
20 Backlight chassis (housing)
21 Light guide plate 21b Upper edge 21c Right edge 22 LED light source 30, 31, 40, 41 Cover plate 31a, 41a Cover plate 32, 42 Connecting plate 46 Energizing plate

Claims (5)

A backlight comprising a light guide plate having a rectangular flat plate shape and a light source facing one side edge of the light guide plate disposed in the housing is disposed so as to face the back surface of the liquid crystal panel, and is projected from one surface of the light guide plate. In a liquid crystal display device that modulates and transmits incident light by the liquid crystal panel and displays an image on the front surface of the liquid crystal panel,
A liquid crystal display device comprising: a light shielding member interposed between the other side edge of the light guide plate and a side wall of the housing facing the other side edge, and covering the other side edge.   The light shielding member includes a contact plate that abuts against the other side edge of the light guide plate and a side wall of the housing, and a connection plate that connects the contact plates so as to be movable relative to each other. The liquid crystal display device according to claim 1.   3. The liquid crystal display device according to claim 2, further comprising: a cover plate that is connected to a contact plate that contacts the other side edge of the light guide plate and covers a peripheral portion of one surface of the light guide plate.   A biasing plate is provided continuously to a contact plate that abuts against the other side edge of the light guide plate, elastically contacts with the rear peripheral edge of the liquid crystal panel, and presses and biases the peripheral edge away from the light guide plate. The liquid crystal display device according to claim 2, wherein the liquid crystal display device is a liquid crystal display device. A liquid crystal display device according to any one of claims 1 to 4,
A receiver for receiving television broadcasts,
A television receiver, wherein an image is displayed on the liquid crystal display device based on a television broadcast received by the receiving unit.

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