JP2008176105A - Liquid crystal display device and television apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display device and a television apparatus in which a display screen 24A of a liquid crystal panel can be easily and accurately positioned with respect to an opening of a front panel and durability of the panel can be improved. <P>SOLUTION: A liquid crystal module 22 is placed inside a casing 12 by attaching a chassis 26 to a front panel 14. A positioning mechanism 39 for positioning the liquid crystal panel 24 with respect to the front panel 14 comprises a positioning part 40 and a rotation inhibiting part 42. The positioning part 41 comprises a positioning pin 40A provided in the front panel 14 and a positioning hole 40B provided in a top chassis 36, into which the positioning pin 40A is fitted. The rotation inhibiting part 42 comprises an engaging pin 42A provided in the front panel 14 and a long groove 42B provided in the top chassis 36, with which the engaging pin 42A is engaged. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a liquid crystal display device and a television device.

Television devices using liquid crystal display devices, display devices for personal computers, and the like are provided.
Such a liquid crystal display device includes a casing and a liquid crystal module accommodated in the casing, and the casing has a front panel made of a synthetic resin facing forward and having an opening formed therein.
The liquid crystal module includes a liquid crystal panel having a display surface, and a metal chassis that holds the liquid crystal panel and is attached to the front panel with the display surface facing the opening.
Here, when the chassis is attached to the front panel, the display surface of the liquid crystal panel with respect to the opening is prevented so that the effective screen of the display surface of the liquid crystal panel is not covered by the edge of the opening (so-called image defect does not occur). It is necessary to perform positioning.
And the structure which provides positioning by providing four positioning members in the back location of the front panel which faces the four corners of a chassis, respectively, and applying the four corners of a chassis to each positioning member is provided (refer patent document 1). .
JP 7-65060 A

However, in the above-described conventional structure, it is necessary to provide a gap between the four corners of the chassis and each positioning member in consideration of the tolerance of the outer dimensions of the chassis, so that there is a backlash corresponding to the gaps. There is a disadvantage in accurately positioning the display surface of the liquid crystal panel with respect to the opening.
If the gap is reduced, the display surface of the liquid crystal panel can be accurately positioned with respect to the opening. However, if the environmental temperature is drastically lowered, the front panel made of synthetic resin contracts more than the metal chassis. Therefore, there is a disadvantage in improving the durability of the front panel, for example, stress is applied to the positioning member of the front panel to cause cracks or cracks.
The present invention has been made in view of such circumstances, and an object of the present invention is to easily and accurately position the display surface of the liquid crystal panel with respect to the opening of the front panel, and to improve the durability of the front panel. It is an object of the present invention to provide a liquid crystal display device and a television device which are advantageous.

In order to achieve the above object, a liquid crystal display device of the present invention includes a housing and a liquid crystal module accommodated in the housing, and the housing faces forward and has a front panel formed with an opening therein. The liquid crystal module includes: a liquid crystal panel having a display surface; and a chassis that holds the liquid crystal panel and that is attached to the front panel so that the display surface faces the opening. A positioning mechanism for positioning the liquid crystal panel is provided, and the positioning mechanism includes a positioning portion and a rotation prevention portion, and the positioning portion includes a positioning pin provided on one of the front panel or the chassis, and the front A positioning hole provided in the other side of the panel or the chassis and into which the positioning pin is fitted, and the rotation preventing portion is formed by the front panel or the chassis. The engagement pin provided on one side of the chassis and the engagement pin provided on the other of the front panel or the chassis and engageable with the engagement pin so that the positioning pin is centered. It is comprised by the long groove which prevents rotation of a front panel or the said chassis.
The television device of the present invention includes a housing and a liquid crystal module accommodated in the housing, and the housing has a front panel facing forward and having an opening formed therein, and the liquid crystal module. Positioning includes a liquid crystal panel having a display surface and a chassis that holds the liquid crystal panel and is attached to the front panel so that the display surface faces the opening, and positioning the liquid crystal panel with respect to the front panel A mechanism is provided, and the positioning mechanism includes a positioning portion and a rotation prevention portion, and the positioning portion is provided on a positioning pin provided on one of the front panel or the chassis and on the other of the front panel or the chassis. The rotation preventing portion is provided on one of the front panel and the chassis. Of the front panel or the chassis centered on the positioning pin by being engaged with the engagement pin provided on the other of the front panel or the chassis and engaging with the engagement pin. It is characterized by comprising a long groove that prevents rotation.

  According to the present invention, the positioning mechanism positions the display surface of the liquid crystal panel with respect to the opening of the front panel, and the engagement pin moves in the long groove even if a difference in thermal expansion occurs between the front panel and the chassis. Thus, the difference in thermal expansion is absorbed.

(First embodiment)
Next, a first embodiment of the present invention will be described with reference to the drawings.
First, the television device 10 using the liquid crystal display device 30 of the first embodiment will be described.
FIG. 1 is a perspective view of the television device 10, and FIG. 2 is an exploded perspective view thereof.
As shown in FIGS. 1 and 2, the television apparatus 10 includes a casing 12 that forms an exterior, and a stand 12 </ b> A that is provided at a lower portion of the casing 12 and is placed on a placement surface. A liquid crystal display device 30 according to the present invention is incorporated therein, and an electrical component 20 (see FIG. 3) is provided in the housing 12.

  The housing 12 includes a front panel 14 and a rear housing 16 and has a rectangular plate shape. Reference numeral 18 in the figure denotes left and right speakers. The housing 12 is the housing of the television device 10 and is a liquid crystal display device. There are also 30 cases.

FIG. 3 is a block diagram illustrating a configuration of the electrical unit 20 of the television device 10.
As shown in FIG. 3, the electrical unit 20 includes a receiving unit 20A, a video signal processing unit 20B, an audio signal processing unit 20C, a control unit 20D, an operation unit 20E, and the like.
The receiving unit 20A performs channel selection based on a command from the control unit 20D, demodulates the television signal received from the antenna, separates it into a video signal and an audio signal, and outputs them.
The video signal processing unit 20B performs necessary signal processing on the video signal and supplies it to the liquid crystal panel 24 of the liquid crystal display device 30 (see FIG. 1). As a result, an image is displayed on the liquid crystal panel 24.
The audio signal processing unit 20C performs necessary signal processing and amplification processing on the audio signal, generates an audio signal, and supplies the audio signal to the speaker 18. As a result, sound is generated from the speaker 18.
The operation unit 20E is for performing various operations and settings related to viewing of broadcasts by the television device 10, and includes, for example, a channel selection switch, a volume adjustment switch, an input changeover switch, and the like.

The control unit 20D controls the reception unit 20A, the video signal processing unit 20B, and the audio signal processing unit 20C based on the operation of the operation unit 20E.
Although not shown, an external input terminal for inputting a video signal and an audio signal supplied from an external device such as a DVD player or a video deck, and a video signal and an audio signal supplied to these external input terminals are converted into a video signal. An input switching circuit for switching and inputting to the processing unit 20B and the audio signal processing unit 20C is provided.
The video signal and the audio signal supplied to the external input terminal by the operation of the operation unit 20E are supplied to the video signal processing unit 20B and the audio signal processing unit 20C via the input switching circuit.

As shown in FIG. 2, the liquid crystal display device 30 includes a liquid crystal module 22, and the liquid crystal module 22 is incorporated in the housing 12. The liquid crystal display device 30 includes a liquid crystal module 22 and a housing 12.
The liquid crystal module 22 includes a liquid crystal panel 24 having a display surface 24A, a backlight device (not shown), a chassis 26 for holding them, and the like.
In FIG. 3, reference numeral 34 denotes a substrate portion constituting the electrical component 20 described above, and the substrate portion 28 is attached to a portion of the chassis 26 located at the rear portion of the liquid crystal module 22 via a screw.
The substrate portion 28 constitutes a part of the liquid crystal module 22.

As shown in FIG. 2, the liquid crystal panel 24 has a rectangular plate shape.
The liquid crystal panel 24 includes two transparent glass substrates, a liquid crystal layer sandwiched between the glass substrates, a transparent electrode provided on the inner surface of the glass substrates, a color filter, a polarizing plate, and the like It is comprised including.
More specifically, the liquid crystal panel 24 is configured by disposing two transparent substrates made of glass or the like so as to face each other and providing a liquid crystal layer in which liquid crystal is sealed in a gap therebetween.
One substrate is formed with signal lines arranged in a matrix, scanning lines, switching elements (thin film transistors) arranged at intersections between the signal lines and the scanning lines, pixel electrodes, and the like. The switching elements are sequentially selected by the scanning lines, and the video signals supplied from the signal lines are written into the corresponding pixel electrodes.
A counter electrode and a color filter are formed on the other substrate.
The color filter is divided into a plurality of segments corresponding to each pixel. For example, the color filter is divided into three segments of three primary colors, a red filter, a green filter, and a blue filter.
Further, these two substrates are sandwiched between two polarizing plates.
Various structures known in the art can be adopted for the structure of the liquid crystal panel 24 itself.

The backlight device irradiates the rear surface of the liquid crystal panel 24 with illumination light. In such a state in which the illumination light is irradiated in this way, a driving signal for image display is supplied to the scanning lines, signal lines, and counter electrodes, and the liquid crystal. By driving the liquid crystal of the layer, an image is displayed on the display surface 24A of the liquid crystal panel 24.
Although none of the backlight devices are illustrated, the backlight device is formed in a portion of the chassis 26 located behind the liquid crystal panel 24, and has an open front illumination space, a reflection sheet that partitions the illumination space, and an illumination space. A fluorescent tube, and a diffusion plate and an optical sheet that close the front portion of the illumination space.
The fluorescent tube is composed of a cold cathode tube (fluorescent lamp) that emits white light when supplied with current.
More specifically, the fluorescent tube has electrodes formed on both sides, a predetermined fluorescent material is applied to the inner wall, and a rare gas such as Hg (mercury) or Xe (xenon) is sealed in the tube. When a current flows through these electrodes in the fluorescent tube, thermoelectrons are emitted from the filament into the tube, discharge starts, the thermoelectrons collide with Hg atoms in the tube, and are excited to emit ultraviolet rays. The Hg atom becomes a ground state by emitting ultraviolet rays. And this ultraviolet-ray is absorbed by the fluorescent material currently apply | coated to the tube wall, and radiate | emits white light outside.

The reflection sheet is formed of a material having a high reflectance, and guides the light irradiated from the fluorescent tube by reflecting it to a diffusion plate. As such a reflection sheet, various conventionally known commercial products and materials are used. Can be adopted.
The diffusion plate diffuses both the light emitted from the fluorescent tube and the light reflected on the diffusion plate by the reflection plate and irradiates the liquid crystal panel 24 from the rear side. It is made of a translucent material.
As a translucent material constituting such a diffusion plate, various conventionally known materials such as polystyrene resin or MS resin (styrene-methyl methacrylate resin) can be employed.
The optical sheet guides light from the diffusion plate to the liquid crystal panel 24, and the optical sheet is provided on the surface where the diffusion plate faces the liquid crystal panel 24. As the optical sheet, various conventionally known commercial products and materials can be used.
The backlight device can employ various known configurations.

Next, a mounting structure between the front panel 14 and the liquid crystal module 22 will be described.
4 is a perspective view of a cross section taken along line AA in FIG. 1, and FIG. 5 is a cross sectional view taken along line AA in FIG.
6A is a perspective view of the front panel 14 viewed from the front, FIG. 6B is a perspective view of the front panel 14 viewed from the rear, and FIG. 7 is a perspective view of the liquid crystal module 22.
FIG. 8 is an explanatory diagram showing the positions of the positioning unit 40 and the rotation blocking unit 42.

The liquid crystal panel 24 has a horizontally long rectangle with dimensions such that the upper and lower sides are larger than the left and right sides.
As shown in FIGS. 6A and 6B, the front panel 14 has upper and lower sides 1410 and 1412 and left and right sides 1414 and 1416 arranged along the four sides of the liquid crystal panel. It has a shape. The upper and lower sides 1410 and 1412 are formed with dimensions larger than the left and right sides 1414 and 1416.
A rectangular opening 1402 is formed inside the front panel 14.
The front panel 14 is made of synthetic resin.
As shown in FIG. 7, the liquid crystal module 22 includes the liquid crystal panel 24 having the display surface 24A as described above, and the chassis 26 that holds the liquid crystal panel 24 and is attached to the front panel 14 with the display surface 24A facing the opening 1402. It has.

As shown in FIGS. 4 and 5, the liquid crystal module 22 is disposed inside the housing 12 by attaching a chassis 26 to the front panel 14.
The chassis 16 includes a bottom chassis 32 positioned behind the liquid crystal panel 24, a middle chassis 34 extending forward from four sides of the bottom chassis 32, and a rectangular frame-shaped top chassis provided at the front of the middle chassis 34. 36.
In the present embodiment, the bottom chassis 32 and the top chassis 36 are made of metal, and the middle chassis 34 is made of synthetic resin.
The four sides of the liquid crystal panel 24 are held by the chassis 26 by being sandwiched between the top chassis 36 and the middle chassis 34.
In this embodiment, the screw insertion hole 3204 is provided in the mounting piece 3202 provided in the bottom chassis 32, the female screw 1404 is provided in the front panel 14, and the female screw of the front panel 14 is provided via the screw insertion hole 3204. By fastening to 1404, the chassis 26 is attached to the housing 12, whereby the liquid crystal panel 24 is incorporated into the housing 12.
Further, as shown in FIG. 2, screw insertion holes are provided at the four corners of the bottom chassis 32 and the four corners of the rear housing 16, respectively, female screws are provided at the four corners of the front panel 14, and the screws 2 are attached to the rear housing. The liquid crystal module 22 is incorporated in the housing 12 by fastening to the female screw of the front panel 14 through the screw insertion hole of the body 16 and the screw insertion hole of the bottom chassis 32.
It should be noted that various well-known configurations can be employed for incorporating the liquid crystal panel 24 into the housing 12 and incorporating the liquid crystal module 22 into the housing 12.

As shown in FIG. 8, a positioning mechanism 39 for positioning the liquid crystal panel 24 with respect to the front panel 14 is provided.
The positioning mechanism 39 includes a positioning unit 40 and a rotation prevention unit 42.
The positioning part 40 and the rotation prevention part 42 are provided across the front panel 14 and the chassis 26. More specifically, the positioning portion 40 and the rotation preventing portion 42 are provided across the front panel 14 and the top chassis 36 (see FIGS. 4 and 5).
The positioning unit 40 positions the display surface 24 </ b> A of the liquid crystal panel 24 with respect to the opening 1402 of the front panel 14.
4, 5, and 8, the positioning unit 40 includes a positioning pin 40 </ b> A provided on the front panel 14 and a positioning hole 40 </ b> B provided on the top chassis 36 and into which the positioning pin 40 </ b> A is fitted. ing.
As shown in FIG. 8, the positioning pin 40 </ b> A is provided on the back surface where the front panel 14 faces the liquid crystal panel 24. In this embodiment, the positioning pin 40 </ b> A is provided in the center in the extending direction of the lower side 1412. It protrudes.
As shown in FIG. 7, the top chassis 36 has upper and lower sides 3610 and 3612 and left and right sides 3614 and 3616 arranged along the four sides of the liquid crystal panel.
In the present embodiment, positioning hole 40B is provided at the center in the extending direction of lower side 3612.

The rotation prevention unit 42 prevents rotation of the front panel 14 or the chassis 26 around the positioning pin 40A, and the front panel 14 and the top chassis 36 (chassis) based on the positioning pin 40A and the positioning hole 40B. 26) absorbs the difference in thermal expansion from that of (26).
As shown in FIG. 8, the rotation prevention unit 42 includes an engagement pin 42A provided on the front panel 14 and a long groove 42B provided on the top chassis 36 and engaged with the engagement pin 42A.
The engaging pin 42A is provided on the back surface of the front panel 14 facing the liquid crystal panel 24. In the present embodiment, the engaging pin 42A is provided at the center in the extending direction of the upper side 1410 and protrudes rearward from the back surface of the upper side 1410.
The long groove 42B is provided at the center in the extending direction of the upper side 3610 and extends vertically.
The extending direction of the long groove 42B is a direction orthogonal to the circumferential direction centering on the positioning pin 40A (positioning hole 40B), and therefore the front panel 14 or chassis centering on the positioning pin 40A (positioning hole 40B). 26, and extends along a direction connecting the positioning pin 40A (positioning hole 40B) and the engaging pin 42A (engaging hole 42B). It extends in a direction to absorb the difference in thermal expansion from the chassis 26.

Next, assembly of the liquid crystal display device 30 will be described.
First, the liquid crystal module 22 is placed on the front panel 14 in a state where the front panel 14 is leveled with the back face upward.
Then, the positioning pins 40A of the front panel 14 are fitted into the positioning holes 40B of the top chassis 36, and the engaging pins 42A of the front panel 14 are engaged with the long grooves 42B of the top chassis 36.
As a result, the liquid crystal panel 24 is positioned with respect to the opening 1402 of the front panel 14, and at the same time, the rotation around the positioning pin 40A of the front panel 14 is prevented.
4 and 5, the chassis 26 is attached to the housing 12 by fastening the screw 4 to the female screw 1404 of the front panel 14 through the screw insertion hole 3204 as shown in FIGS. Worn.
Next, as shown in FIG. 2, the liquid crystal module 22 is held in the housing 12 by fastening the screw 2 to the female screw of the front panel 14 through the screw insertion hole of the rear housing 16 and the screw insertion hole of the chassis 26. Is done.
Thereby, the assembly of the liquid crystal display device 30 is completed.

According to the present embodiment, the liquid crystal panel 24 is positioned with respect to the opening 1402 of the front panel 14 using the positioning portion 40 and the rotation blocking portion 42 provided over the front panel 14 and the top chassis 36 (chassis 26). The liquid crystal panel 24 can be easily and accurately positioned with respect to the opening 1402 of the front panel 14, which is advantageous in reliably preventing the occurrence of image defects.
Further, even if the front panel 14 contracts with a larger size than the top chassis 36 (chassis 26) due to a decrease in the environmental temperature, the engaging pin 42A of the front panel 14 can move within the long groove 42B. Further, no stress is applied to the engaging pin 42A, which is advantageous in improving the durability of the front panel 14.
In the present embodiment, the positioning pin 40A and the engaging pin 42A are both located at the same position (in the center) in the left-right direction of the front panel 14 having a rectangular frame shape, so that the front panel 14 and the top chassis 36 are located. The difference in thermal expansion coefficient in the left-right direction with respect to (chassis 26) does not affect the positioning pins 40A and the engagement pins 42A, and only the difference in thermal expansion coefficient in the vertical direction affects the positioning pins 40A and the engagement pins 42A. However, in this embodiment, since the long groove 42B extends vertically, the long groove 42B can absorb the difference in the coefficient of thermal expansion in the vertical direction, and prevents cracks and cracks caused by the positioning member as in the past. It becomes possible to do.

(Second Embodiment)
Next, a second embodiment will be described.
FIG. 9 is an explanatory view showing the positions of the positioning portion 40 and the rotation prevention portion 42 in the second embodiment. In the following embodiment, the same reference numerals are used for the same parts and members as in the first embodiment. Will be described.
In the first embodiment, the positioning unit 40 and the rotation prevention unit 42 are located at the same position in the left-right direction and are located at different positions in the up-down direction, whereas in the second embodiment In the embodiment, the positioning unit 40 and the rotation blocking unit 42 are located at different positions in the left-right direction, and are located at the same position in the up-down direction.
The configuration of the positioning unit 40 is the same as that of the first embodiment.
The rotation prevention unit 42 is different from that of the first embodiment.
That is, the engaging pin 42 </ b> A is provided at a position away from the center in the longitudinal direction on the lower side 1412 of the front panel 14, and protrudes rearward from the back surface of the lower side 1412.
The long groove 42 </ b> B is provided at a location away from the longitudinal center of the lower side 3612 of the top chassis 36.
The long groove 42B extends in the left-right direction.
The extending direction of the long groove 42B is a direction orthogonal to the circumferential direction centering on the positioning pin 40A (positioning hole 40B), and therefore the front panel 14 or chassis centering on the positioning pin 40A (positioning hole 40B). 26, and extends along a direction connecting the positioning pin 40A (positioning hole 40B) and the engaging pin 42A (engaging hole 42B). It extends in the direction of absorbing the thermal expansion difference from the top chassis 36 (chassis 26).

According to the second embodiment, as in the first embodiment, the front portion 14 and the rotation prevention portion 42 are provided using the positioning portion 40 and the rotation prevention portion 42 provided over the top chassis 36 (chassis 26). Since the liquid crystal panel 24 is positioned with respect to the opening 1402 of the panel 14, the positioning of the liquid crystal panel 24 with respect to the opening 1402 of the front panel 14 can be easily and accurately performed, which is advantageous in reliably preventing the occurrence of image defects.
Further, even if the front panel 14 contracts with a larger size than the top chassis 36 (chassis 26) due to a decrease in the environmental temperature, the engaging pin 42A of the front panel 14 can move within the long groove 42B. Further, no stress is applied to the engaging pin 42A, which is advantageous in improving the durability of the front panel 14.
In the second embodiment, both the positioning pin 40A and the engaging pin 42A are positioned at the same position in the vertical direction at the lower side 1412 of the front panel 14 having a rectangular frame shape in the horizontal direction. The difference in the thermal expansion coefficient in the vertical direction with respect to the top chassis 36 (chassis 26) does not affect the positioning pin 40A and the engagement pin 42A, and only the difference in the thermal expansion coefficient in the left and right direction affects the positioning pin 40A and the engagement pin 42A. Affect. However, in this embodiment, since the long groove 42B extends to the left and right, the long groove 42B can absorb the difference in the coefficient of thermal expansion in the left-right direction, and prevents cracks and cracks caused by the positioning member as in the past. It becomes possible to do.

(Third embodiment)
Next, a third embodiment will be described.
FIG. 10 is an explanatory diagram showing the positions of the positioning unit 40 and the rotation blocking unit 42 in the third embodiment.
The third embodiment is different from the second embodiment in that the positioning portion 40 and the rotation prevention portion 42 are provided on the upper side 1410 of the front panel 14 and the upper side 3610 of the top chassis 36. Other than that, The configuration is the same as that of the second embodiment.
That is, the configuration of the positioning unit 40 is the same as that of the first embodiment, and the rotation prevention unit 42 is different from that of the first embodiment.
The engaging pin 42 </ b> A is provided at a position away from the center in the longitudinal direction on the lower side 1412 of the front panel 14, and protrudes rearward from the back surface of the lower side 1412.
The long groove 42 </ b> B is provided at a location away from the longitudinal center of the lower side 3612 of the top chassis 36.
The long groove 42B extends in the left-right direction.
In the third embodiment, the same effect as that of the second embodiment can be obtained.

In the embodiment, the positioning pin 40A and the engaging pin 42A are provided in the front panel 14 and the positioning hole 40B and the engaging hole 42B are provided in the chassis 26. However, the positioning pin 40A and the engaging pin are described. It is optional to provide 42A, positioning hole 40B, and engagement hole 42B in front panel 14 or chassis 26.
Moreover, the cross-sectional shape of the positioning pin 40A and the engaging pin 42A is arbitrary, and various conventionally known structures can be applied.
In the embodiment, the front panel 14 is made of synthetic resin and the top chassis 36 is made of metal. However, both the front panel 14 and the top chassis 36 are made of synthetic resin or metal. The material of the front panel 14 and the top chassis 36 may be arbitrary.
In this embodiment, the case where the liquid crystal display device 30 is applied to the television device 10 has been described. However, the present invention includes a desktop personal computer monitor device, a notebook personal computer, and a liquid crystal display device. Needless to say, it can be used in imaging devices such as video cameras and digital still cameras, PDAs, and mobile phones, and can be widely used in various electronic devices having liquid crystal display devices.

1 is a perspective view of a television device 10. FIG. 1 is an exploded perspective view of a television device 10. FIG. FIG. 2 is a block diagram illustrating a configuration of an electrical unit 20 of the television device 10. It is a perspective view of the AA line cross section of FIG. It is AA sectional view taken on the line of FIG. (A) is the perspective view which looked at the front panel 14 from the front, (B) is the perspective view which looked at the front panel 14 from back. 4 is a perspective view of a liquid crystal module 22. FIG. It is explanatory drawing which shows the position of the positioning part 40 and the rotation prevention part. It is explanatory drawing which shows the position of the positioning part 40 and the rotation prevention part 42 in 2nd Embodiment. It is explanatory drawing which shows the position of the positioning part 40 and the rotation prevention part 42 in 3rd Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Television apparatus, 12 ... Housing, 14 ... Front panel, 1402 ... Opening, 22 ... Liquid crystal module, 24 ... Liquid crystal panel, 24A ... Display surface, 26 ... Chassis, 30 ... Liquid crystal display device 39 ... Positioning mechanism 40 ... Positioning portion 40A ... Positioning pin 40B ... Positioning hole 42 ... Anti-rotation portion 42A ... Engagement pin 42B ... Long groove

Claims (11)

A housing and a liquid crystal module housed in the housing;
The housing has a front panel that faces forward and has an opening formed therein.
The liquid crystal module comprises a liquid crystal panel having a display surface, and a chassis that holds the liquid crystal panel and is attached to the front panel with the display surface facing the opening,
A positioning mechanism for positioning the liquid crystal panel with respect to the front panel is provided;
The positioning mechanism includes a positioning portion and a rotation prevention portion,
The positioning portion includes a positioning pin provided on one of the front panel or the chassis, and a positioning hole provided on the other of the front panel or the chassis and fitted with the positioning pin.
The rotation blocking portion is provided on one of the front panel and the chassis, and on the other of the front panel and the chassis and is engageable with the engagement pin and engages with the engagement pin. It is composed of a long groove that prevents rotation of the front panel or the chassis around the positioning pin.
A liquid crystal display device. The positioning portion and the rotation prevention portion are located at the same position in the left-right direction and are located at different positions in the up-down direction.
The liquid crystal display device according to claim 1. The positioning portion and the rotation prevention portion are located at different positions in the left-right direction, and are located at the same position in the up-down direction.
The liquid crystal display device according to claim 1. The front panel has a rectangular frame shape composed of left and right sides and upper and lower sides having dimensions larger than the left and right sides,
The positioning pin or the positioning hole is provided at the center in the longitudinal direction on one side of the upper and lower sides,
The engagement pin or the long groove is provided at the center in the longitudinal direction on the other side of the upper and lower sides,
The long groove extends vertically.
The liquid crystal display device according to claim 1. The front panel has a rectangular frame shape composed of left and right sides and upper and lower sides having dimensions larger than the left and right sides,
The positioning pin or the positioning hole is provided at the center in the longitudinal direction on one side of the upper and lower sides,
The engagement pin or the long groove is provided at a position away from the longitudinal center on one side of the upper and lower sides,
The long groove extends from side to side,
The liquid crystal display device according to claim 1. The positioning pin and the engagement pin are provided on the back surface where the front panel faces the liquid crystal panel,
The liquid crystal display device according to claim 1. The front panel is made of synthetic resin,
The chassis has a middle chassis that contacts the back surface of the liquid crystal panel, and a metal top chassis that contacts the four sides of the display surface of the liquid crystal panel.
The positioning mechanism is provided across the front panel and the top chassis,
The liquid crystal display device according to claim 1. The front panel is made of synthetic resin,
The chassis has a middle chassis that contacts the back surface of the liquid crystal panel, and a metal top chassis that contacts the four sides of the display surface of the liquid crystal panel.
The positioning hole and the long groove are provided in the top chassis,
The liquid crystal display device according to claim 1. The front panel and the chassis are formed of materials having different coefficients of thermal expansion,
The liquid crystal display device according to claim 1. The portion of the chassis attached to the front panel is a top chassis that comes into contact with four sides of the display surface of the liquid crystal panel,
The front panel and the top chassis are formed of materials having different coefficients of thermal expansion,
The liquid crystal display device according to claim 1. A housing and a liquid crystal module housed in the housing;
The housing has a front panel that faces forward and has an opening formed therein.
The liquid crystal module comprises a liquid crystal panel having a display surface, and a chassis that holds the liquid crystal panel and is attached to the front panel with the display surface facing the opening,
A positioning mechanism for positioning the liquid crystal panel with respect to the front panel is provided;
The positioning mechanism includes a positioning portion and a rotation prevention portion,
The positioning portion includes a positioning pin provided on one of the front panel or the chassis, and a positioning hole provided on the other of the front panel or the chassis and fitted with the positioning pin.
The rotation blocking portion is provided on one of the front panel and the chassis, and on the other of the front panel and the chassis and is engageable with the engagement pin and engages with the engagement pin. It is composed of a long groove that prevents rotation of the front panel or the chassis around the positioning pin.
A television device characterized by the above.

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