JP2006279358A - Liquid crystal display device and electronic equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display device which is capable of producing sounds of high quality because noises hardly mix with the sounds emitted from its built-in sounding body and to provide electronic equipment. <P>SOLUTION: In the liquid crystal display device 10, the sounding body 21 is provided so as to be surrounded with a base 20 arranged inside a case 11, sound emitted from the sounding body 21 is discharged outside of the case 11 through a sound releasing hole 14 located near a panel display unit 31 provided on the external surface of the case 11. A hollow waveguide means 15 which is formed of a part of the base 20 to guide the sound is arranged between the sounding body 21 and the sound releasing hole 14, The waveguide means 15 is equipped with a first opening 15A which serves as a sound inlet and is formed into a shape A that gets narrower in the travelling direction of the sound and/or a second opening 15B which serves as a sound outlet and is formed into a shape B that gets wider in the travelling direction of the sound. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a liquid crystal display device and an electronic apparatus, and more particularly to a liquid crystal display device that can provide high-quality sound with less noise mixed with sound produced by a built-in sound generator.

  In recent years, in portable liquid crystal display devices such as mobile phones, PDAs, and personal computers, a sound generator that emits sound and a liquid crystal element that forms an element for displaying information (hereinafter referred to as a panel display unit) are in the same housing. Installed. At that time, in order to improve portability, it is required to save space as well as to reduce the size and weight. On the other hand, it is required to increase the area of the panel display unit in order to improve visibility or increase the amount of information to be displayed.

  In other words, by devising the placement location of the sounding body and the placement location of the panel display section, a liquid crystal display that can be equipped with a large area panel display section and that can obtain a substantially high sound pressure level during use. There was a need to develop equipment.

  FIG. 8 is a schematic partial cross-sectional view showing an example of a conventional electronic device (mobile communication terminal) that responds to this. This electronic apparatus includes a liquid crystal display device in which a waveguide unit is provided between a sounding body and a sound emitting hole thereof and a large-area display is mounted (see, for example, Patent Document 1). As shown in FIG. 8, this portable communication terminal has the piezoelectric sounding body 112 on the front surface of the housing 111 (the location of the display (refers to the location where the see-through window 114 through which the display portion of the display can be seen) is provided). However, the sound wave generated in the case 122 of the piezoelectric sounding body 112 is disposed on the inner back surface side, and the sound emitting hole of the receiver 115 of the housing 111 is guided from the inside of the case 122 by the wave guiding means (waveguide pipe 121). It is guided to 116 and is configured to be discharged to the outside of the housing 111.

However, as shown in FIG. 8, if the inner peripheral end of the waveguide means has an angular shape (angular shape) in the traveling direction of the sound emitted by the piezoelectric sounding body 112, the smooth flow of the sound wave is obstructed. Further, burrs (irregular protrusions) α are likely to remain at the inner peripheral end. It has been found that the presence of the burr α disturbs the air flow during sound emission, which in turn generates wind noise (a type of noise), which significantly reduces the quality of the sound produced by the sounding body.
Therefore, in order to secure a large-area panel display section, the waveguide means for guiding the sound emitted by the sounding body is provided, and the waveguide means can promote a smooth flow of sound (sound wave). Development of such a liquid crystal display device and an electronic device equipped with the liquid crystal display device has been expected.
JP 2002-77346 A

  The present invention has been made in view of the above circumstances, and includes a liquid crystal display device capable of emitting a high-quality sound that is unlikely to be mixed with noise generated by a built-in sound generator, and the liquid crystal display device. An object is to provide electronic equipment.

For example, when a cylindrical waveguide pipe is used as a waveguide means for guiding sound generated by a sounding body, the present inventor determines that if the inner peripheral end of the waveguide pipe has a square shape, The knowledge that the smooth flow of air at the time of occurrence (smooth flow of sound waves) is hindered, especially when burrs remain at the inner peripheral edge, noise is generated, and the quality of sound produced by the sounding body is significantly reduced. I found it.
Accordingly, the present inventor has conceived the present invention having the following configuration based on the above.

  That is, in the liquid crystal display device of the present invention, a sounding body is provided so as to be surrounded by a base disposed inside the housing, and the sound emitted by the sounding body is placed in the vicinity of the panel display section provided on the outer surface of the housing. A liquid crystal display device that emits to the outside of the housing through a sound emitting hole that is located, and is a hollow guide that is part of the base and guides the sound between the sounding body and the sound emitting hole. Wave means is arranged, and the waveguide means has a shape A in which the first opening forming the sound entrance narrows in the sound traveling direction, or the second opening forming the sound exit in the sound traveling direction. The shape B is widened, or the first opening has the shape A and the second opening has the shape B.

  According to the above configuration, since the sounding body is surrounded by the base disposed inside the housing, the base can prevent the sound emitted from the sounding body from being emitted. In addition, by selecting the material and shape that make up the inner surface of the base, it is possible to prevent the sound from being absorbed, and special processing can be applied so that the direction of sound travels toward the sound emission hole. Therefore, the use efficiency of the sound produced by the sounding body is high, and the deterioration of the sound quality can be suppressed.

  In addition, since a hollow waveguide means that guides the sound is disposed between the sounding body and the sound emitting hole, the sound emitted by the sounding body is directed toward the sound emitting hole. The sound is always urged to proceed and sound is emitted from the sound emission hole to the outside of the housing. Therefore, high quality sound can be provided without lowering the sound pressure level.

  Furthermore, even when the configuration is such that the sound is emitted to the outside of the casing through a sound emitting hole located in the vicinity of the panel display portion provided on the outer surface of the casing, the sound is generated by adjusting the length of the waveguide means. Since part or all of the body can be provided so as to overlap the back side of the panel display portion, the panel display portion can be configured to substantially occupy the outer surface of the housing. That is, by adopting the waveguide means, it is possible to dispose a large-area panel display unit on the outer surface of the casing, and the sounding body can be disposed so that part or all of the sound generator overlaps the panel display section. Miniaturization can be achieved at the same time.

  In particular, if the first opening constituting the waveguide means has a shape A that narrows in the sound traveling direction, the sound emitted by the sounding body is affected by the shape A when passing through the first opening, As the sound progresses, it must pass through the space where the passage area gradually decreases. And since the 1st opening part is an entrance of the sound of a waveguide means, the sound which a sounding body emits naturally will be in the state converged by passage of the 1st opening part. Further, since the shape A is configured to narrow in the sound traveling direction, burrs that have been a problem in the past are hardly left in the first opening at the time of formation. As a result, when sound (sound wave) passes through the first opening, it can flow smoothly and proceed into the hollow, and as a result, the generation of noise due to the remaining burrs in the first opening is eliminated. Is done. Therefore, the shape A contributes to the sound emitted from the sounding body traveling in the hollow of the waveguide means while maintaining the sound quality.

  On the other hand, if the second opening constituting the waveguide means has a shape B that spreads in the sound traveling direction, the sound emitted by the sounding body is affected by the shape B when passing through the second opening. As the sound travels, it must pass through the space where the passage area gradually increases. And since the 2nd opening part is an exit of the sound of a waveguide means, the sound which a sounding body emits naturally will be in the state open | released by passage of a 2nd opening part. In addition, since the shape B is configured to spread in the sound traveling direction, burrs that have been a problem in the past are hardly left in the second opening at the time of formation. As a result, when sound (sound wave) passes through the second opening, it can flow smoothly and travel from the hollow to the sound emitting hole, and as a result, noise caused by burrs remaining in the second opening. Is eliminated. Therefore, the shape B contributes to the sound emitted from the sounding body traveling from the hollow of the waveguide means to the sound emitting hole while maintaining the sound quality.

  Further, the first opening may have the shape A and the second opening may have the shape B. In this form, the action and effect of the shape A and the action and effect of the shape B described above can be obtained at the same time, so that the sound emitted by the sounding body can be made with higher quality and through the sound emission hole to the outside of the housing. A liquid crystal display device that can be discharged is obtained.

  The first opening and / or the second opening described above preferably have a stepped cross section. In the cross section viewed from the direction parallel to the sound traveling direction, if the opening has a staircase shape, if the number of steps, width, step, etc. are individually set, the opening area toward the back of the opening The cross-sectional shape of the opening can be designed so as to be narrowed. The width and step of the stairs may be constant, but for example, a form in which the width of the stairs is narrowed toward the back of the opening and the steps are increased may be adopted. For example, a multi-step process is required to form a staircase, but even if burrs are formed in the preceding stage (large opening degree), the former stage burrs are formed by performing the latter stage (small opening degree) step processing. Can be removed. The angle formed between the width portion of the staircase and the step portion is not limited to 90 °. When the angle is set in the range of 90 ° to 180 °, the angle formed by the width portion of the staircase and the step portion becomes an obtuse angle, which is preferable because the occurrence of burrs at the edge of the staircase can be reduced.

  Further, as the first opening and / or the second opening described above, those having a C-shaped cross section may be used. In a cross section viewed from the direction parallel to the sound traveling direction, if the opening is configured to be a single face or multiple faces (called C shape), the opening area becomes narrower toward the back of the opening. The cross-sectional shape of the opening can be designed. When the opening is a single surface, the angle formed by the single surface with the inner surface of the opening is not particularly limited, but the opening area at the entrance of the opening can be controlled by changing this angle. On the other hand, when the opening is multifaceted, the width of each surface and the angle between the connected surfaces may be constant, but for example, the width of each surface is increased toward the back of the opening to connect the connected surfaces. It is also possible to adopt a form in which the angle formed by is widened. For example, multi-stage processing is required to obtain a C shape. Even if burrs are formed by surface processing at the previous stage (large opening degree), the burrs at the previous stage can be performed by performing surface processing at the subsequent stage (small opening degree). Can be removed.

  Further, as the first opening and / or the second opening described above, those having a cross section of an R shape may be used. In a cross section viewed from a direction parallel to the sound traveling direction, if the opening is configured to be a part of a circular arc or a combination thereof (called an R shape), the opening area narrows toward the back of the opening. Thus, the cross-sectional shape of the opening can be designed. In addition to the form in which the cross section of the opening is formed of a single arc, a form in which a plurality of arcs are combined may be employed. If the arc is used in this way, there is no portion projecting at an acute angle in the cross section of the opening, so that it is possible to eliminate the occurrence of burrs in the opening.

(Liquid crystal display device)
Hereinafter, a first embodiment of the liquid crystal display device of the present invention will be described with reference to the drawings.
In each figure, the scale is different for each member so that each member has a size that can be recognized on the drawing.

FIG. 1 is a schematic plan view showing an example of the liquid crystal display device of the present embodiment, in which both the internal structure and a part are displayed. FIG. 2 is a schematic cross-sectional view taken along the line AA ′ shown in FIG.
As shown in FIGS. 1 and 2, the liquid crystal display device 10 is provided with a sounding body 21 so as to be surrounded by a base body 20 disposed inside the housing 11, and the sound emitted by the sounding body 21 is transmitted to the housing 11. This is a liquid crystal display device that emits to the outside of the housing 11 through the sound emission holes 14 located in the vicinity of the panel display unit 31 provided on the outer surface of the liquid crystal display. In addition, the claw part 26 (26a-26d) provided in the outer periphery of the base | substrate 20 exists in the state clamped by the lower part 11a and upper part 11b of a housing | casing.

  Further, between the sounding body 21 and the sound emitting hole 14, there is disposed a hollow waveguide means 15 that is a part of the base body 20 and guides the sound emitted from the sounding body 21. The panel display part 31 can be provided so that a part or all may overlap. Therefore, it is possible to mount the panel display unit 31 having a large area that occupies a wide area in the upper part 11b of the housing. In other words, the liquid crystal display device 10 guides the sound (sound wave) generated by the sounding body 21 in the base body 20 from the inside of the base body 20 to the sound emitting hole 14 provided in the upper portion 11b of the casing by the waveguide unit 15. It is configured to discharge to the outside of the body 11.

  As shown in FIG. 2, the sounding body 21 is provided with a frame 22 on the outer periphery, and this frame 22 is a double-sided surface that is substantially parallel to the vibration surface of the sounding body 21 by a first support 24 and a second support 25. It is comprised so that may be clamped. Further, by arranging the first support 24 in contact with the inner surface of the housing 11, the first support 24 is composed of one surface of the sounding body 21, the inner surface of the first support 24, and a part of the inner surface of the housing 11. An air chamber 41 is provided. On the other hand, the second support 25 is disposed in contact with the inner surface of the base body 20, so that the second air consisting of the other surface of the sounding body 21, the inner side surface of the second support body 25, and a part of the inner surface of the base body 20. A room is provided. With such a configuration, the sound (sound wave) emitted by the sounding body 21 travels toward the hollow of the waveguide means 15. In addition, the thick arrow shown in the hollow of the waveguide means 15 represents the advancing direction of the sound which the sounding body 21 emitted.

  In FIG. 2, reference numeral 16 denotes an air vent hole provided in the lower part 11 a of the housing, reference numeral 23 denotes a drive signal input part of the sounding body 21, and reference numeral 32 denotes a third support that supports the back side of the panel display part 31. The body 33 is a display signal input unit of the panel display unit 31. As the sounding body 21, a piezoelectric element, a speaker, or the like can be used.

  As is clear from FIGS. 1 and 2, a hollow waveguide means 15 that is a part of the base body 20 and guides the sound emitted from the sounding body 21 is disposed between the sounding body 21 and the sound emitting hole 14. ing. The waveguide means 15 has a shape A in which the first opening 15a forming the sound entrance narrows in the sound traveling direction (the direction indicated by the thick arrow in the figure), or the second opening 15b forming the sound exit. The shape B spreading in the sound traveling direction, or the first opening 15a has the shape A and the second opening 15b has the shape B.

  FIG. 3 is a schematic cross-sectional view showing only the waveguide means 15 and the vicinity thereof in an enlarged manner, and shows cases where the waveguide means 15 is composed of the three types described above. (A) when the first opening 15a has the shape A, (b) when the second opening 15b has the shape B, and (c) the shapes of the first opening 15a and the second opening 15b, respectively. This is a case of having A and shape B at the same time. The thick arrow in FIG. 3 means the traveling direction of the sound emitted by the sounding body as in FIG.

  By providing the waveguide means 15 having such a shape A or shape B, the sound emitted by the sounding body 21 is always urged to travel toward the sound emitting hole 14, and from the sound emitting hole to the outside of the housing. Sound is emitted. Further, in the conventional apparatus (FIG. 8), since the opening of the waveguide means has an angular shape when viewed from the cross-sectional direction, there is a possibility that burrs may remain in this opening, and the air flow during sound emission is disturbed. Wind noise (a kind of noise) or the like is generated, and the quality of the sound generated by the sounding body is significantly reduced. However, the liquid crystal display device 10 according to the present invention has the first opening of the waveguide means 15 constituting the sound. By applying the shape A or the shape B described above to the portion 15a or the second opening 15b, the burr hardly or not remains.

  Therefore, the liquid crystal display device 10 provided with the waveguide means 15 having the shape A or the shape B described above is less likely to mix noise with the sound produced by the built-in sound generator 21, and can emit high quality sound. It becomes. That is, according to the present invention, in order to secure a large-area panel display section, the waveguide means guides the sound generated by the sounding body, and the waveguide means allows a smooth flow of sound (sound wave). A liquid crystal display device having a configuration capable of prompting is obtained.

FIG. 4 is a schematic cross-sectional view showing an example in which a stepped shape A is applied to the first opening 15a. In the cross section viewed from the direction parallel to the sound traveling direction, if the opening has a staircase shape, if the number of steps, width, step, etc. are individually set, the opening area toward the back of the opening The cross-sectional shape of the opening can be designed so as to be narrowed.
In particular, FIG. 4A shows a form in which the width of the staircase and the level difference are constant. FIG. 4B shows a form in which the width of the staircase decreases and the step height of the staircase increases in order toward the sound traveling direction (back of the opening). FIG. 4C shows a form in which the width of the staircase and the step are both constant, but both are inclined, and the angle of the edge of the staircase is in the range of 90 ° to 180 °. Even if any form is adopted, burrs hardly remain.

FIG. 5 is a schematic cross-sectional view showing an example in which the shape A having a C shape is applied to the first opening that is the sound inlet of the waveguide means 15. In a cross section viewed from the direction parallel to the sound traveling direction, even if a configuration with a single-sided or multi-sided opening (C shape) is adopted, the opening area is narrowed toward the back of the opening. The cross-sectional shape of the part can be designed.
In particular, FIG. 5A shows a form in which the opening is a single surface. FIG. 5B shows a form in which the opening is multifaceted, and the width of each face and the angle between the connected faces are constant. FIG. 5C shows a form in which the opening is multifaceted, the width of each face is increased toward the sound traveling direction (the back of the opening), and the angle between the connecting faces is constant. However, in the embodiment of FIG. 5C, the latter angle may be widened or narrowed toward the back of the opening. Even if any form is adopted, burrs hardly remain.

FIG. 6 is a schematic cross-sectional view showing an example in which the shape A having an R shape is applied to the first opening that is the sound inlet of the waveguide means 15. Even in the cross section viewed from the direction parallel to the sound traveling direction, even if a configuration (R shape) in which the opening is a part of a circular arc or a combination thereof is adopted, the opening area is narrowed toward the back of the opening. In addition, the cross-sectional shape of the opening can be designed.
In particular, FIG. 6A shows a form in which the cross section of the opening is formed by one arc. FIG. 6B shows a form in which a plurality of arcs are combined. When the arc is used in this way, there is no portion projecting at an acute angle in the cross section of the opening, so that no burrs can be generated in the opening.

  In addition, in the above, with reference to FIGS. 4-6, although the example which applied the shape A which consists of each type (step shape, C shape, R shape) to the 1st opening part 15a was explained in full detail, Needless to say, even if applied to the shape B which is provided in the second opening 15b which forms the outlet and which spreads in the sound traveling direction, it acts in the same manner, and the generation of burrs at the opening can be suppressed or eliminated.

(Electronics)
Next, specific examples of the electronic apparatus provided with the liquid crystal display device according to the embodiment of the present invention will be described.
FIG. 7 is a perspective view illustrating an example of a mobile phone. In FIG. 7, reference numeral 50 denotes a mobile phone body, reference numeral 51 denotes a panel display portion of the liquid crystal display device, reference numeral 52 denotes a sound emission portion of the liquid crystal display device, and reference numeral 53 denotes the panel display portion 51 and the sound emission hole 52. It is a housing of a liquid crystal display device provided in the same plane.

  When the liquid crystal display device of the above embodiment is used, a sounding body (not shown) can be mounted in the housing so as to overlap with the panel display unit 51, so that the panel display unit can be adopted for a large area. Further, waveguide means (not shown) is arranged between the sounding body and the sound emitting part, and the above-mentioned burr is formed in the first opening which is the sound inlet and the second opening which is the sound outlet. Since it is difficult to form, it is difficult for noise to be mixed with the sound produced by the built-in sound generator, and high-quality sound can be emitted. Therefore, according to the present invention, the panel display unit 51 having excellent visibility due to the adoption of a large screen, and the sound emission hole 52 capable of emitting high-quality sound due to the use of the waveguide means with a devised opening. An electronic device provided in the same casing 53 and capable of reducing the size of the casing is obtained.

1 is a schematic plan view of a liquid crystal display device according to an embodiment of the present invention. The cross-sectional schematic diagram of the A-A 'part in FIG. FIG. 2 is a schematic cross-sectional view showing only the waveguide means of FIG. The cross-sectional schematic diagram which shows the example which applied the shape A which makes step shape to the 1st opening part. The cross-sectional schematic diagram which shows the example which applied the shape A which makes C shape to the 1st opening part. The cross-sectional schematic diagram which shows the example which applied the shape A which makes R shape to the 1st opening part. FIG. 14 is a perspective view illustrating an example of an electronic device including the liquid crystal display device of the invention. An example of a conventional liquid crystal display device is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Liquid crystal display device, 11 Case, 14 Sound emission hole, 15 Wave guide means, 15a 1st opening part, 15b 2nd opening part, 20 Base | substrate, 21 Sounding body, 22 Frame body, 24 1st support body, 25 1st Two supports, 31 Panel display

Claims (4)

A sounding body is provided so as to be surrounded by a base body arranged inside the housing, and the sound emitted from the sounding body passes through a sound emitting hole located in the vicinity of a panel display portion provided on the outer surface of the housing. A liquid crystal display device that emits to the outside of the
Between the sounding body and the sound emitting hole, a hollow waveguide means made of a part of the base and guiding the sound is arranged,
The waveguide means has a shape A in which the first opening forming the sound entrance narrows in the sound traveling direction, or a shape B in which the second opening forming the sound exit extends in the sound traveling direction, or The liquid crystal display device, wherein the first opening has a shape A and the second opening has a shape B.   The liquid crystal display device according to claim 1, wherein the first opening and / or the second opening has a stepped cross section.   The liquid crystal display device according to claim 1, wherein the first opening and / or the second opening has a C-shaped cross section. The liquid crystal display device according to claim 1, wherein the first opening and / or the second opening has an R shape in cross section.

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