JP2009267577A - Thin display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thin display device which can miniaturize a body while a speaker is provided in the body except a desktop stand. <P>SOLUTION: A liquid crystal television 100 is provided with: a thick plate-like body 10 equipped with a display surface 11 on its front and having a depth shorter than a height; and the stand 20 fixed on the lower end of the body 10 in a state where the upper surface abuts on the bottom surface of the body 10 and supporting the body 10. The liquid crystal television 100 is further provided with: a casing C; a speaker 12 in which a sound emitting surface 12a is substantially vertical to the display surface 11 and the sound emitting surface 12a substantially abuts on the inner surface of the bottom of the casing C; an opening 25 provided on the front surface of the stand 20; and a sound guiding structure for guiding sounds emitted from the speaker 12 to the opening in a hollow S provided inside the stand 20. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a thin display device, and in particular, a thick plate-like main body portion having a display surface on the front surface and having a depth shorter than the height, and the main body portion in a state where the upper surface is in contact with the bottom surface of the main body portion. The present invention relates to a thin display device including a support leg fixed to a lower end and supporting the main body.

  Conventionally, speakers of this type of thin display device are often arranged as shown in FIG. In the figure, the liquid crystal television 1 is covered with a housing, and the display surface of the liquid crystal panel is exposed from a substantially rectangular opening on the front surface of the housing. A speaker hole is formed under the display surface on the front surface of the housing, and the speaker is attached inside the speaker hole. The speaker holes may be arranged not only below the display surface but also on the left and right.

In Patent Document 1, a speaker that outputs a mid to high range is provided, a low range speaker is disposed in a leg portion, and a hole is formed on an upper surface of a table on which a television is placed. An apparatus in which an opening is provided on the front surface of the mounting table is disclosed. The sound reproduced by the speaker in the leg is emitted from the opening through the hole and through the inside of the table.
Patent Document 2 describes a television stand device that includes a frame that fits into the bottom of a television receiver, and a pedestal on which the television receiver is placed. The pedestal has a speaker louver with a built-in speaker. When the pedestal is placed, the external speaker connection terminal of the television receiver is connected to the pedestal and outputs sound from the pedestal.
Patent Document 3 discloses a display device in which a plurality of speaker units are provided on the front surface of a pedestal portion of a stand that indicates an image display portion of a liquid crystal display panel.
Japanese Utility Model Publication No. 2-101675 JP 62-142478 A Japanese Patent Laid-Open No. 2003-204587

  In the conventional liquid crystal television described above, a speaker is generally arranged inside the front surface of the housing. Therefore, the width of the frame part below and on the left and right sides of the display surface must be at least the width of the speaker, which hinders downsizing. In the techniques of Patent Documents 1 to 3, the stand for stationary is provided with a speaker, and the main body is not downsized while the speaker is provided inside the main body.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a thin display device that can be reduced in size while being provided with a speaker inside a main body portion excluding a stationary stand.

  In order to solve the above problems, in the present invention, the main body is provided with a thick plate-like main body portion having a display surface on the front surface and having a depth shorter than the height, and a top surface in contact with the bottom surface of the main body portion. A thin display device including a support leg fixed to a lower end of the unit and supporting the main body unit includes a housing, a speaker, an opening, and a sound guide structure.

The housing constitutes an outer wall of the main body. The sound emitting surface of the speaker is substantially perpendicular to the display surface, and the sound emitting surface is substantially in contact with an inner surface of a portion of the housing where the support leg is in contact. The sound emitting surface is a surface that emits sound. For example, in the case of a dynamic speaker, the surface on which the cone paper (diaphragm) is disposed is not the side on which the voice coil or the magnet is disposed, but the sound emitting surface. Since the support leg is fixed to the lower end of the main body portion, it comes into contact with any one of the bottom surface, lower front surface, lower back surface, and lower left and right side surfaces of the main body portion. Of the surfaces that may come into contact with each other, the sound emitting surface is substantially perpendicular to the display surface on either the bottom surface or the lower left and right side surfaces. Accordingly, the portion with which the support leg is in contact is the bottom surface or the lower left and right side surfaces of the support leg.
The loudspeaker is generally wide in a direction parallel to the diaphragm and thin in a direction perpendicular to the diaphragm because the width of the diaphragm determines the frequency of sound. Further, a display panel (such as a liquid crystal panel or a plasma display panel) of a thin display device has a shape that is wide in a direction parallel to the display surface and thin in a direction perpendicular to the display surface. Therefore, the area of the front surface of the housing can be reduced by arranging the sound emitting surface substantially perpendicular to the display surface.

  And the said opening is provided in the front surface of the said support leg, and the sound guide structure which guides the sound which a speaker discharge | releases to this opening is provided in the said support leg. That is, the sound emitted from the speaker is guided to the opening of the support leg through the sound guide structure and emitted from the opening. Therefore, it is possible to prevent a reduction in sound quality while reducing the area of the front surface of the housing.

  As a selective one aspect of the present invention, the portion of the housing where the support legs abut may be the bottom surface of the housing. That is, the speaker is arranged on the inner surface of the bottom surface that is surely contacted among the portions where the support legs may contact.

  As an optional aspect of the present invention, the support leg is hollow, and a hole penetrating from the sound emitting surface of the speaker to the hollow is formed in the housing and the support leg, and the hollow is formed in the hole. The sound may be guided from the opening to the opening. According to this configuration, the sound guide structure can be easily realized.

  As an optional aspect of the present invention, the support leg may be closed at the bottom. When the bottom surface is closed, the sound quality emitted from the opening through the sound guide structure can be kept constant regardless of the place where the thin display device is placed. For example, depending on the installation place, there is a possibility that the placement surface is a carpet or a lattice. The carpet absorbs the sound, and in a structure with many gaps like a lattice, the sound falls out. If the lower surface is closed, the influence of such a deferred place can be eliminated.

  As an optional aspect of the present invention, the support leg may be removable from the main body. When the support leg is removed from the main body, a thin display device can be used as a wall hanging. When used as a wall mount, it is generally installed at a relatively high position with few obstacles on the bottom side. The sound emitted from the speaker is emitted with directivity toward the bottom surface side, but if there is a wide space, it can be diffracted and reach the user's ears, and can be viewed without a sense of incongruity.

  As a selective aspect of the present invention, the support leg may include a reflector that reflects the sound emitted from the speaker toward the opening. The reflector constitutes a part of the sound guide structure. According to this configuration, it is possible to improve the sound guide efficiency of the sound guide structure by increasing the ratio of the sound emitted from the opening in the sound output from the speaker.

As described above, according to the present invention, it is possible to provide a thin display device capable of preventing deterioration in sound quality while reducing the area of the front surface of the housing.
According to the second aspect of the present invention, it is possible to output sound from below the display surface that is most often arranged in the conventional thin display device.
According to the invention of claim 3, the sound guiding structure can be easily realized.
Furthermore, according to the invention concerning Claim 4, the influence with respect to the sound quality of a deferred place can be excluded.
Moreover, according to the invention concerning Claim 5, it becomes switchable by wall hanging and deferment.
And according to the invention concerning Claim 6, the sound-conduction efficiency of a sound-conduction structure can be improved.
Furthermore, it is needless to say that in a more specific configuration as in claim 7, the same effects as those of the inventions of claims 1 to 6 described above can be achieved.

Hereinafter, embodiments of the present invention will be described in the following order.
(1) Configuration of thin display device:
(2) Sound guide structure:
(3) Modification of sound guide structure:
(4) Summary:

(1) Configuration of thin display device:
1 and 2 show the appearance of a liquid crystal television that specifically realizes the thin display device of the present invention. FIG. 1 is a front view of a liquid crystal television, and FIG. 2 is a right side view of the liquid crystal television. The liquid crystal television 100 includes a thick plate-like main body 10 that is wide in the vertical and horizontal directions and has a short depth (front and back length), and stands 20L and 20R (support legs) that have a long depth (front and back length) and a narrow width (right and left length). ). The main body 10 alone is difficult to be stable and independent. The stands 20L and 20R are attached to the lower end of the main body 10 and support the display surface of the main body 10 in a state of being oriented substantially vertically, for example, so that the main body 10 does not fall forward and backward. Of course, the orientation angle of the display surface is an example, and it may be supported by being oriented at an arbitrary angle.

  The main body 10 is covered with a substantially rectangular casing C (outer wall) made of resin. The display surface of the liquid crystal panel is exposed from a rectangular opening provided on the front surface of the housing C, and constitutes the display surface 11 of the main body 10. The front surface of the casing C excluding the opening constitutes a frame portion that surrounds the display surface in a frame shape. An operation input panel 14 is provided on the lower frame. The operation input panel 14 includes a power button, a channel button, a volume button, a menu display button, and the like. Of course, the operation input panel 14 may be provided on the upper frame, the left and right frames, and the left and right side surfaces and the upper surface of the housing.

  In addition to the liquid crystal panel, various electrical configurations for realizing the liquid crystal television 100 are built in the housing C. More specifically, a tuner circuit, a video processing circuit, an audio processing circuit, a liquid crystal panel, a driving circuit, a backlight, an inverter circuit, a power supply circuit, a remote control signal receiving circuit, an operation input circuit, and the like are provided. These circuits may be formed as chips on an integrated circuit.

  The tuner circuit receives a television broadcast signal and extracts a broadcast signal of a predetermined frequency band from the television broadcast signal. The video processing circuit extracts a video signal from the extracted broadcast signal, and performs scaling processing, image quality adjustment processing, OSD (on-screen-display) signal superimposition processing, and the like. The audio processing circuit extracts an audio signal from the extracted broadcast signal, adds an acoustic effect to the audio signal, and performs amplification. The liquid crystal panel displays an image on the screen. The drive circuit drives the liquid crystal panel based on the video signal generated by the video processing circuit. The backlight irradiates light from the back of the liquid crystal panel. The inverter circuit generates a predetermined AC voltage and turns on the backlight with the generated AC voltage. The power supply circuit receives a commercial power supply, generates various power supply voltages from the commercial power supply, and supplies them to various electrical configurations of the liquid crystal television. The remote control signal receiving circuit receives a remote control signal (such as an infrared signal or a radio signal) and outputs a control command corresponding to the remote control signal. The operation input circuit includes operation buttons (power-on button, channel switching button, volume control button, etc.), and outputs a control command corresponding to the operated button.

  3 and 4 are examples of the arrangement of members inside the housing C. FIG. 3 is a schematic cross-sectional view of the AA cross section of FIG. 1, and FIG. 4 is a schematic cross-sectional view of the BB cross section of FIG. In the housing C, a liquid crystal module 15, a main board 16, a sub board 17, and a speaker 12 are generally arranged. The liquid crystal module 15 is a module in which a liquid crystal panel, a backlight, and a drive circuit are modularized. The back surface of the liquid crystal module 15 is covered with a resin plate or a metal plate, and the main substrate is fixed to the back surface. A tuner circuit, a video processing circuit, an audio processing circuit, a power supply circuit, and an inverter circuit are mounted on the main board. However, the main board does not have to be a single board, and a plurality of boards connected by cables may be used. For example, a specific circuit (for example, an inverter circuit) is physically separated from another board, or a specific circuit is divided (for example, an analog processing part of a video processing circuit is mounted on a single-layer board, and a digital processing part is a multilayer board) Etc.).

  The sub-board 17 is fixed to the frame portion, upper side surface, and left and right side surfaces of the front surface of the housing C. In particular, when a highly directional transmission medium such as an infrared signal is used for transmission of the remote control signal, the sub board 17 is fixed to the frame part on the front surface of the casing C. Note that the sub board 17 may be divided into a plurality of boards in the same manner as the main board 16.

  The speaker 12 generally includes a magnet, a movable coil, a diaphragm (cone), and a frame. The speaker 12 is fixed to the inner bottom surface of the casing with the diaphragm side facing the inner bottom surface of the casing. (Hereinafter, the side of the diaphragm of the speaker 12 will be referred to as the sound emitting surface 12a.) The speaker of the liquid crystal television needs to output sound that covers the human audible range. For example, in the case of a full-range speaker that secures low and high frequency characteristics centered on the middle frequency range with a single speaker, a diaphragm having a diameter of a certain size or more is required. Since the diameter of the diaphragm determines the width of the speaker 12, the speaker 12 mounted on the liquid crystal television 100 is generally wide.

  Sound directed to the inner bottom surface of the housing is emitted from the sound emitting surface 12a. A speaker hole 13 is provided on the inner bottom surface of the housing facing the sound emitting surface 12a. The speaker hole 13 is a hole for releasing sound reproduced by the speaker 12 to the outside of the housing. The speaker 12 may be an electrodynamic type or an electrostatic type. As the shape of the speaker 12, various forms such as a cone type, a dome type, a horn type, and a flat / flat type can be adopted. Furthermore, instead of a specific diaphragm such as cone paper, a method of directly resonating a vibrating body (for example, a housing) with a piezoelectric vibrator or the like may be used.

  The depths of the stands 20R and 20L are longer than that of the main body 10, and for example, in the example shown in FIG. The stands 20R and 20L have a height (vertical length) shorter than a depth (front and rear length) for stability in the front-rear direction. The bottoms of the stands 20R and 20L are flat and can be stably placed on a horizontal place. In FIG. 1, the stands 20 </ b> R and 20 </ b> L are narrow, and are arranged at a predetermined interval between the lower right end and the lower left end of the main body 10. Of course, the left and right widths and the number of stands of each stand are arbitrary. For example, three stands may be arranged at the left and right and the center, respectively, or one wide stand is arranged at the substantially lower center of the main body 10 at the left and right. May be. In the following description, when a configuration common to the left and right stands is described, R and L will be omitted.

(2) Sound guide structure:
Hereinafter, the sound guide structure formed on the stand and the main body of the present invention will be described in detail with reference to FIGS. FIG. 5 is a partial perspective view showing the vicinity of the speaker 12 of the main body 10 in a cutaway manner. 3 to 5, the stand 20 includes a groove 21, a speaker hole 23, and an opening (sound emission port) 24, and the inside is a hollow S.

  The groove 21 extends in the left-right direction on the upper surface of the stand 20, and the lower end of the main body 10 is inserted into the groove 21. The stand and the main body are fixed to each other by an uneven engagement structure such as a protrusion and a recess, or by screwing. The width (front / rear length) of the groove 21 is substantially the same as the depth of the main body 10. Of course, if the width of the groove 21 and the depth of the main body 10 are adjusted so that the groove 21 tightly sandwiches the lower end of the main body 10, the main body 10 and the stand 20 can be connected to each other without any engagement structure or screwing. Can be fixed.

  The groove 21 includes a front side wall 21a, a rear side wall 21c, and a bottom wall 21b. A speaker hole 23 is provided in the bottom wall 21b. The speaker hole 23 communicates with the internal hollow S. The bottom wall 21b is in contact with the bottom surface of the housing C, and a speaker hole 23 is provided at the corresponding contact portion. The speaker hole 23 is formed at a position corresponding to the speaker hole 13 in a state where the stand 20 and the main body 10 are fixed. The opening 24 is formed on the front side surface of the stand 20 and communicates with the hollow S. That is, the speaker hole 13 and the speaker hole 23 pass through the sound emitting surface 12a and the hollow S of the speaker, and the hollow S constitutes a sound guide structure that guides the sound emitted from the speaker 12 to the opening 24.

  With the above configuration, the sound emitted from the speaker 12 is emitted from the opening 24. Note that the sound passing through the hollow S may be absorbed by the outer shell of the stand 20 to vibrate the outer shell, but the heavy main body 10 is placed on the stand 20. Therefore, the occurrence of chatter noise and the like is suppressed.

  By the way, the arrangement of the speaker is not limited to the bottom surface in the housing C, but may be a side surface in the housing C. FIG. 6 shows a modification of the speaker arrangement. In this modification, as shown in FIG. The overhanging portion 125 extends so as to cover one of the left and right side walls of the casing C (the lower end of the right side wall if it is a right stand, and the lower end of the left side wall if it is a left stand). The inside of the overhanging portion 125 is also hollow and constitutes a part of the hollow S. In the portion where the overhanging portion 125 and the housing C abut, the speaker hole 123 is formed in the overhanging portion 125 and the speaker hole 113 is formed on the housing C side. That is, the hollow S communicates between the speaker hole 123 and the speaker hole 113 and the opening 24, and the hollow S constitutes a sound guide structure.

(3) Modification of sound guide structure:
In order to guide sound more efficiently in the sound guide structure, the following various modifications can be considered.
The installation location of the liquid crystal television 100 may have various situations such as flooring, carpets, tatami mats, and cabinets. When the stand 20 is installed on a carpet or the like having high sound absorption efficiency, the sound guide efficiency of the sound output from the speaker 12 is lowered. Therefore, as shown in FIG. 7, a closing plate 26 is provided on the bottom of the stand 20. FIG. 7 is a partial cross-sectional view showing the blocking plate 26 near the stand of the AA cross section of FIG. A material having high sound reflection efficiency and a material having high resonance in the frequency band of the speaker output are suitable for the blocking plate 26. If the bottom of the stand 20 is closed, the sound transmission efficiency in the sound guide structure does not depend on the installation location of the liquid crystal television 100, and stable sound reproduction is possible.

  In the present invention, the sound emission direction of the speaker 12 is downward or left and right side. Thus, the sound guide structure guides the sound emitted in a direction different from the user viewing direction to the user side. That is, in the sound guide structure, the sound emission direction is converted, and improving the conversion efficiency improves the sound guide efficiency. Therefore, as shown in FIG. 8, a reflecting plate 27 is provided in the hollow S so that sound incident from the speaker holes 13 and 23 is reflected toward the opening 24, or as shown in FIG. The openings 24 are connected with a smooth tube or the like. 8 and 9 are partial sectional views showing the vicinity of the stand of the AA cross section of FIG. In the case of FIG. 8, the hollow S and the reflection plate 27 constitute a sound guiding structure, and in the case of FIG. 9, the tube constitutes a sound guiding structure. According to this modification, attenuation in the stand 20 can be prevented, and the proportion of sound emitted from the speaker 12 emitted from the opening 24 can be increased.

(4) Summary:
As described above, according to the above-described embodiment, the thick plate-like main body 10 having the display surface 11 on the front surface and having a shorter depth than the height, and the upper surface in contact with the bottom surface of the main body 10. In the liquid crystal television 100 including the stand 20 that is fixed to the lower end of the main body 10 and supports the main body 10, the housing C and the sound emitting surface 12 a are substantially perpendicular to the display surface 11. The sound emitted from the speaker 12 through the speaker 12 having the sound emitting surface 12a substantially in contact with the inner surface of the bottom surface of the housing C, the opening 25 provided in the front surface of the stand 20, and the hollow S provided in the stand 20 is described above. Lead to the opening. Therefore, it is possible to provide a thin display device capable of reducing the size of the main body portion while providing the speaker in the main body portion excluding the stationary stand.

Needless to say, the present invention is not limited to the above embodiments. It goes without saying for those skilled in the art,
・ Applying mutually interchangeable members and configurations disclosed in the above embodiments by appropriately changing the combination thereof.− Although not disclosed in the above embodiments, it is a publicly known technique and the above embodiments. The members and configurations that can be mutually replaced with the members and configurations disclosed in the above are appropriately replaced, and the combination is changed and applied. It is an embodiment of the present invention that a person skilled in the art can appropriately replace the members and configurations that can be assumed as substitutes for the members and configurations disclosed in the above-described embodiments, and change the combinations and apply them. It is disclosed as.

It is a front view of a liquid crystal television. It is a right view of a liquid crystal television. It is a schematic sectional drawing of the AA cross section of FIG. It is a schematic sectional drawing of the BB cross section of FIG. It is the fragmentary perspective view which fractured and showed the speaker 12 vicinity. It is a figure which shows the modification of speaker arrangement | positioning. It is the fragmentary sectional view which showed the stand vicinity of the AA cross section of FIG. It is the fragmentary sectional view which showed the stand vicinity of the AA cross section of FIG. It is the fragmentary sectional view which showed the stand vicinity of the AA cross section of FIG. It is sectional drawing which shows the speaker arrangement | positioning in the conventional thin display apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Main-body part, 11 ... Display surface, 12 ... Speaker, 12a ... Sound emission surface, 13 ... Speaker hole, 14 ... Operation input panel, 15 ... Liquid crystal module, 16 ... Main board | substrate, 17 ... Sub board | substrate, 20 ... Stand, 20L ... Stand, 20R ... Stand, 21 ... Groove, 21a ... Front side wall, 21b ... Bottom wall, 21c ... Rear side wall, 23 ... Speaker hole, 24 ... Opening, 26 ... Closure plate, 27 ... Reflection plate, 100 ... Liquid crystal television John, 113 ... Speaker hole, 120 ... Stand, 123 ... Speaker hole, 125 ... Overhang

Claims (7)

A thick plate-shaped main body with a display surface on the front surface and a short depth compared to the height, and the upper surface fixed to the lower end of the main body with the upper surface in contact with the bottom of the main body to support the main body In a thin display device comprising a supporting leg,
A housing constituting the outer wall of the main body,
A speaker having a sound emitting surface substantially perpendicular to the display surface, wherein the sound emitting surface is substantially in contact with an inner surface of a portion of the housing in contact with the support leg;
An opening provided in front of the support leg;
A sound guide structure provided on the support leg for guiding the sound emitted from the speaker to the opening;
A thin display device comprising:   The thin display device according to claim 1, wherein a portion of the housing that is in contact with the support leg is a bottom surface of the housing. The support leg is hollow;
A hole penetrating from the sound emitting surface of the speaker to the hollow is formed in the housing and the support leg,
The thin display device according to claim 1, wherein the hollow constitutes the sound guide structure that guides the sound from the hole to the opening.   The thin display device according to claim 1, wherein a bottom surface of the support leg is closed.   The thin display device according to claim 1, wherein the support leg is removable from the main body.   The thin display device according to claim 1, wherein the support leg includes a reflection plate that reflects sound emitted from the speaker toward the opening. The thin display device includes:
A closing plate for closing the bottom surface of the support leg;
In the support leg, a reflector that reflects the sound emitted from the speaker toward the opening;
Further comprising
The speaker substantially abuts the sound emitting surface on the inner bottom surface of the housing;
The support leg has a hollow inside;
The hollow constitutes a sound guiding structure that guides the sound emitted by the speaker to the opening;
A hole penetrating from the sound emitting surface of the speaker to the hollow is formed in the housing and the support leg,
The thin display device according to claim 1, wherein the support leg is removable.

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