JP2012165096A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device which includes a receiving part of a remote controller at a position of a device body excluding a peripheral part of a liquid crystal panel.SOLUTION: A liquid crystal display device 1 includes an infrared reception element 36 serving as a receiving part of an infrared signal 16 transmitted from a remote controller 15 on a rear surface of a liquid crystal panel 2. The liquid crystal panel 2, a diffuser 33, and a diffusion sheet 34 and the like constantly allow the infrared signal 16 transmitted from the remote controller 15 to pass therethrough. Thus, the infrared signal 16 transmitted from the remote controller 15 passes through a protection plate 35, the liquid crystal panel 2, the diffusion sheet 34 and the like, and the diffuser 33 and reaches the infrared reception element 36. The liquid crystal display device 1 receives the infrared signal 16 transmitted from the remote controller 15 and performs control according to the signal.

Description

  The present invention relates to a liquid crystal display device including a receiving unit for a signal transmitted from a remote controller.

  Some display devices such as a television receiver and an information display include a liquid crystal panel. Some display devices provided with a liquid crystal panel are provided with a receiving portion for infrared signals transmitted from a remote controller on the periphery of the liquid crystal panel (see Patent Document 1).

  In addition, a display device having a narrow peripheral edge of a liquid crystal panel has been developed (see Non-Patent Document 1).

JP 2009-3126 A

“Information Display Liquid Crystal Display General Catalog 2010-9”, Sharp Corporation B (b) -1176H.60 PN1009J p. 3. [Search January 19, 2011] Internet <URL: http://www.sharp.co.jp/lcd-display/corporate/lineup/pdf/c_info.pdf>

  However, since the display device described in Non-Patent Document 1 has a narrow width at the periphery of the liquid crystal panel, an infrared signal receiver can be provided at the periphery of the liquid crystal panel as in the display device described in Patent Document 1. There wasn't. For this reason, an infrared signal receiving unit must be separately attached to the outside of the display device, and the infrared signal receiving unit may be conspicuous. Also, the work of separately attaching the infrared signal receiver is complicated.

  Therefore, an object of the present invention is to provide a display device that is a device main body and includes a receiver of a remote controller at a position other than the periphery of a liquid crystal panel.

  The liquid crystal display device of the present invention includes a liquid crystal panel, a backlight unit, and a receiver. The backlight unit is disposed behind the liquid crystal panel and includes a backlight light source. The receiving unit receives the infrared signal transmitted by the remote controller. The receiving unit is installed in the backlight unit.

  In this configuration, since the receiving unit is installed in the backlight unit arranged behind the liquid crystal panel, the mounting operation of the receiving unit is unnecessary, the receiving unit is not conspicuous, and the width of the peripheral edge of the liquid crystal panel The present invention can also be applied to a liquid crystal display device in which is narrowed to the limit. Further, when the user operates the remote controller in the direction of the liquid crystal panel, an infrared signal is transmitted from the remote controller, passes through the liquid crystal panel, and reaches a receiving unit disposed behind the liquid crystal panel. Therefore, the same operability as when the receiving unit is provided around the liquid crystal panel can be secured.

  In the liquid crystal display device of the above invention, the receiving unit is installed on the same surface as the backlight light source behind or on the side of the backlight light source.

  In this configuration, since the receiving unit is not installed between the liquid crystal panel and the backlight light source, the receiving unit does not interfere with the light from the backlight light source, and the luminance of the liquid crystal panel can be stabilized.

  In the liquid crystal display device of the present invention, the backlight unit includes a through hole for guiding an infrared signal to the outside. The receiving unit is installed outside the backlight unit so as to face the through hole.

  In this configuration, since the receiving unit can be provided outside the backlight unit, the receiving unit can be repaired or replaced without disassembling the backlight unit.

  In the liquid crystal display device of the above invention, the backlight unit includes a guide member that transmits infrared rays. One end of the guide member is in contact with the diffusion plate installed on the back side of the liquid crystal panel, and the other end is fixed to the through hole of the backlight unit.

  In this configuration, the infrared signal transmitted by the remote controller can be guided to the receiving unit installed outside the backlight unit. In addition, dust and the like can be prevented from entering the backlight unit. Furthermore, since the diffusion plate is supported by the guide member, excessive deflection of the diffusion plate can be prevented.

  In the liquid crystal display device of the above invention, the backlight unit includes the adjacent first strip-shaped substrate and second strip-shaped substrate. A through hole is provided at the boundary between the first strip substrate and the second strip substrate.

  In this configuration, a through hole can be configured by providing two cutouts on the end face of the first strip-shaped substrate and making the two cutouts face each other. In this case, since hole processing is not required for the strip-shaped substrate, manufacturing efficiency can be improved.

  According to this invention, it is an apparatus main body, Comprising: A display apparatus provided with the receiving part of a remote controller in positions other than the periphery of a liquid crystal panel can be provided.

FIG. 2A is a front view of a liquid crystal display device according to an embodiment of the present invention. FIG. 2B is a side view of the liquid crystal display device according to the embodiment of the present invention. FIG. 3C is a side perspective view of the liquid crystal display device according to the embodiment of the present invention. (A) is front perspective drawing of the backlight unit provided with the fluorescent tube, and has shown a part of right side. (B) is AA sectional drawing in FIG. 2 (A) of a liquid crystal panel and a backlight unit. (A) is AA sectional drawing which changed a part of backlight unit shown in FIG.2 (B). (B) is AA sectional drawing which changed a part of backlight unit shown to FIG. 3 (A). (A) is front perspective drawing of the backlight unit provided with LED, and has shown a part of right side. (B) is a BB sectional view in Drawing 4 (A) of a liquid crystal panel and a back light unit. (A) is BB sectional drawing which changed a part of backlight unit shown to FIG. 4 (B). (B) is a BB cross-sectional view in which a part of the backlight unit shown in FIG. 4 (A) is changed. It is front perspective drawing of the backlight unit provided with the through-hole in the boundary of a strip-shaped board | substrate, and has shown a part of right side.

  As shown in FIGS. 1A to 1C, the liquid crystal display device 1 includes a liquid crystal panel 2, a backlight unit 3, and a control board 4 inside a housing 11.

  The liquid crystal panel 2 is obtained by stacking polarizing plates on both surfaces of a unit sealed by sandwiching liquid crystal between two glass substrates. The liquid crystal panel 2 is divided into a plurality of pixels, and the liquid crystal display device 1 displays an image on the liquid crystal panel 2 by changing the voltage applied to each pixel.

  The backlight unit 3 is disposed behind the liquid crystal panel 2 and includes a backlight light source that illuminates the liquid crystal panel 2 from the back surface. As the backlight source, a fluorescent tube (CCFT tube) or LED is used.

  The control board 4 is disposed behind the backlight unit 3 and includes an image display circuit for displaying an image on the liquid crystal panel 2 and a lighting circuit for lighting a backlight light source.

  Next, the backlight unit 3C using a fluorescent tube (CCFT tube) as a backlight light source will be described.

  As shown in FIGS. 2A and 2B, the backlight unit 3C includes a housing 30, a plurality of fluorescent tubes 31 (the fluorescent tubes 31A to 31G are shown in the figure), and a reflection. A light receiving substrate 37 to which a sheet 32 (reflective sheets 32A to 32B are shown), a diffusion plate 33, a diffusion sheet 34, a protection plate 35, and an infrared receiving element 36 are provided.

  The casing 30 of the backlight unit 3C has a box shape and one opening, and the liquid crystal panel 2 is held in the opening. Between the back surface 30 </ b> B of the housing 30 and the liquid crystal panel 2, a plurality of fluorescent tubes 31 are arranged in parallel with the liquid crystal panel 2 at equal intervals. The plurality of fluorescent tubes 31 are backlight light sources that emit light from the back side of the liquid crystal panel 2.

  A reflective sheet 32 is installed in parallel with the liquid crystal panel 2 between the back surface 30 </ b> B of the housing 30 and the plurality of fluorescent tubes 31. The reflection sheet 32 reflects the light emitted from the fluorescent tube 31 toward the liquid crystal panel 2.

  A diffusion plate 33 and diffusion sheets 34 are installed on the back surface 2 </ b> B of the liquid crystal panel 2. The diffusion plate 33 and the diffusion sheets 34 diffuse the illumination light emitted from the fluorescent tube 31 uniformly.

  A protective plate 35 is installed on the surface 2F of the liquid crystal panel 2. The protection plate 35 is a transparent plate that protects the surface of the liquid crystal panel 2.

  In the present invention, an infrared receiving element 36 that is a receiving unit for the infrared signal 16 transmitted from the remote controller 15 is installed in the backlight unit 3 disposed behind the liquid crystal panel 2. In the backlight unit 3, fluorescent tubes and LEDs, which are backlight light sources, are installed at predetermined intervals, and a sufficient space for mounting the infrared receiving element 36 between the fluorescent tubes and LEDs can be secured.

  Most of the light emitted from the fluorescent tube and the LED is visible light, and may contain a little infrared light (infrared light). However, the fluorescent tubes and LEDs that are backlight light sources are set so that the fundamental frequency and its harmonics are less than 33 kHz or more than 40 kHz. On the other hand, the remote controller 15 is set to transmit information by performing modulation such that infrared light emission and non-light emission are repeated using a subcarrier of 33 to 40 kHz. Therefore, the infrared receiving element 36 can receive the infrared signal 16 without being affected by the infrared rays emitted from the backlight light source.

  The liquid crystal panel 2 uses a polarizing plate for visible light, and this polarizing plate transmits the infrared signal 16 transmitted by the remote controller 15. Further, the liquid crystal and glass substrate of the liquid crystal panel 2, the diffusion plate 33, the diffusion sheets 34, and the protection plate 35 of the backlight unit 3 also transmit the infrared signal 16 transmitted by the remote controller 15.

  Therefore, the infrared signal 16 transmitted from the remote controller 15 on the front side of the liquid crystal display device 1 passes through the protective plate 35, the liquid crystal panel 2, the diffusion sheets 34, and the diffusion plate 33 and is received by the infrared receiving element 36. Is done. Thereby, in the liquid crystal display device 1, the infrared signal 16 transmitted from the remote controller 15 can be received without providing the infrared receiving element 36 at the periphery of the liquid crystal panel 2.

  Note that the infrared signal 16 transmitted by the remote controller 15 is an infrared ray of 900 to 950 nm as an example. Therefore, the polarizing plate of the liquid crystal panel 2 may be one that always transmits at least 900 to 950 nm infrared rays.

  The infrared receiving element 36 may be provided at a position described below in the backlight unit 3. As shown in FIG. 2B, in the direction parallel to the back surface 2B of the liquid crystal panel 2, the infrared receiving element 36 is disposed between the plurality of fluorescent tubes 31 (for example, the midpoint between the fluorescent tubes 31C and 31D). Provide. In addition, in the direction perpendicular to the back surface 2 </ b> B of the liquid crystal panel 2, an infrared receiving element 36 is provided behind or on the side of the fluorescent tube 31 (such as between the fluorescent tubes 31). That is, if the distance from the back surface 2B of the liquid crystal panel 2 to the infrared receiving element 36 is L1, and the distance from the back surface 2B of the liquid crystal panel 2 to the center of the fluorescent tube 31 is L2, the distance L1 is set to be L2.

  For example, as shown in FIG. 2B, the light receiving substrate 37 is brought into contact with the back surface 30 </ b> B of the housing 30, and the infrared receiving element 36 attached to the light receiving element 37 is exposed from the hole 321 provided in the reflection sheet 32. Let

  By arranging the infrared receiving element 36 at such a position, the shadow of the infrared receiving element 36 is not projected onto the liquid crystal panel 2. Further, the infrared signal 16 transmitted from the remote controller 15 is not blocked by the fluorescent tube 31.

  The infrared receiving element 36 having a wide directivity angle characteristic can receive the infrared signal 16 transmitted from a wider range.

  The infrared receiving element 36 can also be provided outside the housing 30. As in the backlight unit 3C2 shown in FIG. 3A, a back surface 30B facing the liquid crystal panel 2 of the housing 30 and a hole (through hole) 301 that penetrates the reflection sheet 32 are provided. The hole 301 is provided between the plurality of fluorescent tubes 31 (for example, the midpoint between the two fluorescent tubes 31C and 31D) in a direction parallel to the back surface of the liquid crystal panel 2. Then, the infrared receiving element 36 is installed outside the backlight unit 3 so as to face the hole 301 so that the infrared receiving element 36 receives the infrared signal 16 through the hole 301. The light receiving substrate 37 is connected to the control substrate 4 by connectors 38A and 38B.

  In this configuration, the backlight unit 3C2 only needs to be drilled, and the infrared receiving element 36 is not provided inside the backlight unit 3C2. Therefore, when the infrared receiving element 36 fails, the infrared receiving element 36 can be repaired or replaced without disassembling the backlight unit 3C2. Moreover, since the wiring length from the infrared receiving element 36 to the control board 4 is shortened as compared with the backlight unit 3C shown in FIG. 2B, it is possible to make it less susceptible to noise and the like.

  As described above, when the infrared receiving element 36 is provided outside the backlight unit 3C2, the hole 301 provided in the housing 30 is formed of a transparent material (for example, polycarbonate or glass) that transmits the infrared signal 16. The lid member 41 is inserted. Alternatively, although not shown, the infrared receiving element 36 is inserted into the hole 301 and the light receiving substrate 37 is brought into contact with the housing 30. Thereby, it is possible to prevent dust and the like from entering the backlight unit 3C2.

  Further, a guide member 42 may be provided instead of the lid member 41 as in the backlight unit 3C3 shown in FIG. The guide member 42 is formed of the same material as that of the lid member 41 and has a rod shape, and a rib 422 is formed in the vicinity of one end 421. Since one end 421 is inserted into the hole 301 and hooked by the rib 422, the guide member 42 is inserted and fixed in the hole 301. Further, the other end 423 of the guide member 42 is in contact with the diffusion plate 33. By providing such a guide member 42, (1) the infrared signal 16 transmitted from the remote controller 15 can be guided to the infrared receiving element 36 installed outside the housing 30. (2) It is possible to prevent dust and the like from entering the backlight unit 3C. (3) Since the diffusion plate 33 can be supported by the guide member 42, the deflection of the diffusion plate 33 can be prevented.

  3B shows an example in which the guide member 42 is inserted and fixed in the hole 301. However, a rib 422 is provided on one end 421 of the guide member 42, and the end 421 is provided in the hole 301. It is also possible to fix the holes 301 covered with the ribs 422 without inserting them.

  FIG. 3B shows an example in which the infrared receiving element 36 is attached to the control board 4 without providing the light receiving board 37. In this configuration, members such as a light receiving substrate and a connector can be reduced.

  Next, a case where an LED is used as the backlight light source will be described. In this configuration, the configuration of the backlight unit is different from the case where a fluorescent tube is used as the backlight light source. The LED lighting circuit has a circuit configuration different from that of the fluorescent tube lighting circuit, but does not directly affect the present invention. Therefore, in the following description, differences between the backlight unit 3L that uses LEDs and the configuration shown in FIG. 2 (a fluorescent tube is used as the backlight light source) will be described. The same elements as those in the configuration shown in FIG.

  The backlight unit 3L includes a housing 30, a plurality of LEDs 51 (LEDs 51A to 51P in the drawing), a reflection sheet 52 (the reflection sheets 52A to 52B are shown in the drawing), a diffusion plate 33, and diffusion sheets 34. , A protection plate 35, an infrared receiving element 36, and a backlight substrate 57. The backlight substrate 57 is formed by arranging a plurality of strip-shaped substrates adjacent to each other. FIG. 4A shows a strip-shaped substrate 57A to a strip-shaped substrate 57B.

  The liquid crystal panel 2 is held in the casing 30 of the backlight unit 3L. A backlight substrate 57 is installed on the back side of the liquid crystal panel 2. The backlight substrate 57 is in contact with a surface 302 parallel to the liquid crystal panel 2 of the housing 30. LEDs 51 (LEDs 51A to 51P) are attached to each backlight substrate 57 at predetermined intervals. Reflective sheets 52 (52A, 52B) are installed on the surface of the backlight substrate 57 facing the diffusion plate 33 (liquid crystal panel 2). The reflection sheet 52 reflects the light emitted from the LED 51 in the direction of the liquid crystal panel 2.

  The infrared light receiving element 36 is attached to the backlight substrate 57 between the LEDs 51 (in the middle of the LEDs 51C and 51E in FIG. 4A). The infrared receiving element 36 is exposed from a hole 521 provided in the reflection sheet 52.

  Also in this configuration, when the distance from the back surface 2B of the liquid crystal panel 2 to the infrared receiving element 36 is L1, and the distance from the back surface 2B of the liquid crystal panel 2 to the center of the LED 51 is L3, the liquid crystal panel 2 is arranged so that L1 ≧ L3. Yes. In FIG. 4B, L1 = L3. Therefore, also in this configuration, the same effect as the backlight unit 3C can be obtained.

  Similar to the configuration shown in FIG. 3A, the infrared receiving element 36 can be provided outside the housing 30. Like the backlight unit 3L2 shown in FIG. 5A, a hole 521 that passes through the housing 30, the strip-shaped substrate 57A, and the reflective sheet 52A between two LEDs (between the LED 51C and the LED 51E in FIG. 5). Is provided. The infrared receiving element 36 is installed outside the hole 521 so that the infrared receiving element 36 receives (receives) the infrared signal 16 through the hole 521. The lid member 41 made of a transparent material (for example, polycarbonate or glass) that transmits the infrared signal 16 is inserted into the hole 521. Thereby, the effect similar to the backlight unit 3C2 is acquired.

  Similar to the configuration shown in FIG. 3B, a guide member 42 may be provided instead of the lid member 41. That is, as in the backlight unit 3L3 shown in FIG. 5B, one end 421 of the guide member 42 is inserted and fixed in the hole 521, and the other end 423 is brought into contact with the diffusion plate 33. Thereby, the same effect as the backlight unit 3C3 can be obtained.

  The through hole provided in the backlight substrate 57 can also be provided at the boundary between two adjacent strip-shaped substrates. That is, as shown in FIG. 6, in the strip-shaped substrate 57 </ b> A that is the first strip-shaped substrate, the cutout that is the first notch portion is formed on the end surface adjacent to the strip-shaped substrate 57 </ b> B that is the second strip-shaped substrate. A notch 521A is provided. In addition, a second notch portion facing the notch 521A, that is, a notch 521B is provided on an end surface of the strip-like substrate 57B adjacent to the strip-shaped substrate 57A. When the strip-shaped substrate 57A and the strip-shaped substrate 57B are attached to the casing 30 so as to be adjacent to each other, the two notches 521A and the notches 521B become a part of the holes 521.

  In the case where a hole for allowing the infrared signal 16 to pass is provided in the substrate, a cutting step and a hole processing step are required when the substrate is formed. On the other hand, if the outer shape is cut so that the substrate has a notch when the substrate is formed, the hole machining step is not necessary. Therefore, the manufacturing process can be simplified by combining the notches to be part of the hole 521.

  As described above, according to the liquid crystal display device according to the embodiment of the present invention, the infrared receiving element is arranged on the back side of the liquid crystal panel even when the peripheral portion of the liquid crystal panel is narrow and the receiving unit for the infrared signal 16 cannot be provided. Therefore, the infrared signal 16 transmitted from the remote controller 15 can be received.

  In addition, although the example provided with one infrared receiving element was demonstrated in the above description, it is not restricted to this, Of course, you may make it provide multiple infrared receiving elements. In this case, when any one of the infrared receiving elements receives the infrared signal 16 transmitted from the remote controller 15, control is performed according to the infrared signal 16.

  DESCRIPTION OF SYMBOLS 1 ... Liquid crystal display device 2 ... Liquid crystal panel 3, 3C, 3C2, 3C3, 3L, 3L2, 3L3 ... Backlight unit 4 ... Control board 11 ... Case 15 ... Remote controller 16 ... Infrared signal 30 ... Case 31 (31A- 31G) ... Fluorescent tube 32 (32A-32B) ... Reflective sheet 33 ... Diffusion plate 34 ... Diffusion sheet 35 ... Protective plate 36 ... Infrared receiving element 37 ... Light receiving substrate 38A, 38B ... Connector 41 ... Lid member 42 ... Guide member 51 (51A to 51P) ... LED 52 (52A to 52B) ... Reflective sheet 56 ... Infrared receiving element 57 ... Backlight board 57A, 57B ... Strip board 301, 321 ... Hole 421 ... End 422 ... Rib 423 ... End 521 ... Hole 521A, 521B ... Notch

Claims (5)

LCD panel,
A backlight unit disposed behind the liquid crystal panel and provided with a backlight light source;
A receiver for receiving an infrared signal transmitted by the remote controller;
In a liquid crystal display device comprising:
The liquid crystal display device, wherein the receiving unit is installed in the backlight unit.   The liquid crystal display device according to claim 1, wherein the reception unit is installed at a rear side or a side of the backlight light source. The backlight unit includes a through hole that guides the infrared signal to the outside.
The liquid crystal display device according to claim 1, wherein the receiving unit is disposed outside the backlight unit so as to face the through hole. The backlight unit includes a guide member that transmits infrared rays,
4. The liquid crystal display device according to claim 3, wherein one end of the guide member is in contact with a diffusion plate installed on the back side of the liquid crystal panel, and the other end is fixed to the through hole. The backlight unit includes a first strip-shaped substrate and a second strip-shaped substrate adjacent to each other,
5. The liquid crystal display device according to claim 3, wherein the through hole is provided at a boundary between the first strip-shaped substrate and the second strip-shaped substrate.

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