JP2013254106A - Display device and television receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device and television receiver that can suppress light leak on a display surface of a display panel while the thickness and the frame width are decreased.SOLUTION: An upper limb of the back face of a circuit board 281 is in contact with a lower limb of the front face 23a of a light guide plate 23, and a lower end of the circuit board 281 is located inside an insertion groove 371 (namely, it is closer to LED substrate 26 than to LEDs 25, 25,...). A light shielding projection 34 blocks the range from the inner face of a front frame part 311 to a lower limb of the circumference of the front face 23a of the light guide plate 23. Therefore, among the light radiated from the LEDs 25, 25,..., the light that does not enter the inside of the light guide plate 23 through the lower end face 23b of the light guide plate 23 is blocked by the circuit board 281 or the light shielding projection 34 and hence does not enter the inside of the display panel 21.

Description

  The present invention relates to a display device in which a display panel is illuminated by light emitted from a light source, and a television receiver including the display device.

The liquid crystal display device includes a liquid crystal display panel and a backlight. The backlight illuminates the liquid crystal display panel from the back side of the liquid crystal display panel (see Patent Document 1).
The edge-light type backlight has a light guide plate disposed on the back side of the liquid crystal display panel via an optical sheet group, and an LED mounted on the LED substrate is disposed opposite to an end surface (for example, a lower end surface) of the light guide plate. It becomes.
Light emitted from the LED is guided to the back side of the liquid crystal display panel by the light guide plate, and enters the liquid crystal display panel through diffusion and condensing by the optical sheet group. As a result, the display surface of the liquid crystal display panel becomes uniformly bright.

A circuit board on which a signal circuit is mounted is disposed on one side (for example, the lower side) of the light guide plate. When viewed from the LED, since the circuit board is located on the opposite side of the light guide plate, the light incident from the LED to the light guide plate is not hindered by the circuit board.
An SOF (System On Film) is interposed between the circuit board and the liquid crystal display panel. The SOF includes a driver LSI and a flexible substrate. The driver LSI drives the display panel by receiving a display drive signal from the signal circuit. As a result, an image is displayed on the display panel.

  The liquid crystal display panel, the backlight, the circuit board, and the SOF are accommodated in a housing that uses a front cabinet and a rear cabinet.

Japanese Patent Laid-Open No. 2001-117097

When the light emitted from the LED enters the liquid crystal display panel without passing through the light guide plate or the optical sheet group, a phenomenon that a part of the display surface becomes unnecessarily brighter than the other part (hereinafter referred to as light leakage) occurs. Arise. As a result, the image quality of the video displayed on the display surface is deteriorated.
The cause of light leakage is that the peripheral edge of the back surface of the liquid crystal display panel is not covered with the optical sheet group, and a space through which light can pass between the LED and the liquid crystal display panel (hereinafter referred to as light leakage space). Exist. For this reason, a part of the light emitted from the LED passes through the light leakage space and enters the inside of the liquid crystal display panel from the peripheral portion on the back surface of the liquid crystal display panel or the end surface of the display panel.

The liquid crystal display device described in Patent Document 1 further includes a reflection plate that reflects light emitted from the light source toward the light guide plate, and a double-sided adhesive sheet-shaped light shielding member. The edge of the reflecting plate is fixed to the edge of the light guide plate by a light shielding member. The light reflector and the light shielding member close the light leakage space. For this reason, the light that has not entered the light guide plate is reflected by the reflecting plate, or reflected or absorbed by the light shielding member.
Another conventional liquid crystal display device further includes a panel chassis to which a liquid crystal display panel is attached, and covers the optical sheet group, the light guide plate, and the LEDs with the panel chassis. The panel chassis closes the light leakage space. For this reason, the light radiated | emitted from LED cannot enter into the inside of a liquid crystal display panel, unless it passes through the inside of a light-guide plate and an optical sheet group.

  Incidentally, in recent years, the number of components has been reduced in order to reduce the thickness and frame size of liquid crystal display devices. However, when the reflective plate or the light shielding member is reduced from the liquid crystal display device described in Patent Document 1, or when the panel chassis is reduced from another conventional liquid crystal display device, light leakage cannot be suppressed.

  The present invention has been made in view of such circumstances, and a main object of the present invention is to provide a display device and a television receiver that can suppress light leakage on the display surface of the display panel while reducing the thickness and the frame size. Is to provide a machine.

  A display device according to the present invention includes a display panel having a display surface on the front side, a light guide plate that is disposed on the back side of the display panel, emits light incident from the end surface to the inside, and the end surface. In a display device comprising: a light source disposed oppositely; a non-transparent light source substrate on which the light source is mounted; and a circuit board for displaying an image on the display panel. A space is provided between a peripheral portion on the light source side and the light source substrate, and the circuit board is non-translucent and is arranged to shield the space from the light source. Features.

  The display device according to the present invention is characterized in that a part of the circuit board is in contact with the light guide plate, and the other part is located closer to the light source board than the light source.

  The display device according to the present invention further includes a flexible substrate attached to the display panel, and the flexible substrate is electrically connected to the circuit substrate.

  The display device according to the present invention includes a cabinet that surrounds the peripheral edge of the display surface, and is provided integrally with the cabinet, and the light source substrate is attached to release heat generated by the light source to the outside. And a heat dissipating part.

  A television receiver according to the present invention includes the display device according to the present invention and a receiving unit that receives a television broadcast, and an image is displayed on the display device based on the television broadcast received by the receiving unit. It is characterized by being displayed.

In the present invention, the display device includes a display panel, a light guide plate, a light source, a light source substrate, and a circuit substrate.
The light source is disposed to face the end face of the light guide plate. For this reason, a part of the light emitted from the light source enters the inside of the light guide plate from the end face of the light guide plate, and is emitted from the front surface of the light guide plate to be guided to the back side of the display panel. The light guided to the back side of the display panel enters the inside of the display panel from the back side of the display panel and is emitted from the front side of the display panel. As a result, the display surface of the display panel becomes brighter.

  The display device has a space between the light source substrate and the peripheral portion on the light source side in the peripheral portion on the back surface of the display panel. For this reason, when other part of the light emitted from the light source passes through this space, light leakage may occur. This is because the light passing through this space can enter the display panel without passing through the light guide plate. That is, this space is a light leakage space.

In the conventional display device, the circuit board is arranged on the side opposite to the light guide plate side when viewed from the light source. However, in the present invention, the circuit board shields the light leakage space from the light source. For this reason, light leakage is suppressed. At this time, the circuit board is not arranged in a space from the light source to the light guide plate. Therefore, the incidence of light from the light source to the light guide plate is not hindered by the circuit board.
Since both the light source board and the circuit board are non-translucent, there is no possibility that light transmitted through the light source board or the circuit board enters the display panel.

In the present invention, a part of the circuit board is in contact with the light guide plate, and the other part of the circuit board is located closer to the light source board than the light source. Specifically, for example, if the light source is disposed opposite to the lower end surface of the light guide plate, the upper portion of the circuit board is in contact with the light guide plate, and the lower portion of the circuit board is positioned below the light source.
For this reason, it becomes difficult for another part of the light emitted from the light source to bypass the circuit board by reflection or diffraction or the like and pass through the light leakage space. Therefore, light leakage is further reliably suppressed.

In the present invention, the display device further includes a flexible substrate.
A flexible substrate is interposed between the display panel and the circuit board. Even if the circuit board is arranged in a position or position different from the conventional one, if the flexible board is bent / stretched, the electrical connection between the display panel and the circuit board can be maintained.

In the present invention, the display device further includes a cabinet and a heat dissipation unit.
This cabinet is a front cabinet, for example, and surrounds the periphery of the display surface of the display panel.
A conventional display device includes a heat dissipating member to which a light source substrate is attached separately from the cabinet in order to release heat generated by the light source to the outside.
On the other hand, in the case of the present invention, the heat radiating part is provided integrally with the cabinet. For this reason, the number of parts can be reduced. Further, the heat transmitted to the heat radiating portion is released to the outside of the display device through the cabinet. Therefore, it is not necessary to provide a means for releasing the heat transmitted to the heat radiating unit to the outside of the display device.

In the present invention, the television receiver includes the display device and the receiving unit according to the present invention.
In the display device according to the present invention, light leakage is suppressed. Therefore, when displaying an image based on the television broadcast received by the receiving unit, the image quality of the displayed image is suppressed from being deteriorated due to light leakage.

  In the case of the display device and the television receiver according to the present invention, light leakage can be suppressed even in a configuration that does not include a reflector and a light shielding member, a panel chassis, or the like as provided in a conventional display device. it can. This is because the circuit board blocks unnecessary light that is about to enter the inside of the display panel. The circuit board itself also includes a conventional display device. Therefore, it is not necessary to add a new member for suppressing light leakage to the display device and the television receiver. As a result, thinning and narrowing of the display device and the television receiver are not hindered.

It is a perspective view which shows the external appearance of the television receiver which concerns on Embodiment 1 of this invention. It is a longitudinal cross-sectional view of the protrusion position of the light-shielding convex part which shows typically the structure of the display apparatus which concerns on Embodiment 1 of this invention. It is a longitudinal cross-sectional view of the non-projection position of the light-shielding convex part which shows typically the structure of the display apparatus which concerns on Embodiment 1 of this invention. It is a front view which shows the structure of a part of panel unit with which the display apparatus which concerns on Embodiment 1 of this invention is provided. It is a longitudinal cross-sectional view which shows typically the structure of the conventional display apparatus corresponding to FIG. It is a longitudinal cross-sectional view which shows typically the structure of the conventional display apparatus corresponding to FIG. It is a front view which shows the structure of a part of panel unit with which the conventional display apparatus is provided corresponding to FIG. It is a longitudinal cross-sectional view of the protrusion position of the light-shielding convex part which shows typically the structure of the display apparatus which concerns on Embodiment 2 of this invention. It is a longitudinal cross-sectional view of the non-projection position of the light-shielding convex part which shows typically the structure of the display apparatus which concerns on Embodiment 2 of this invention. It is a front view which shows the structure of a part of panel unit with which the display apparatus which concerns on Embodiment 2 of this invention is provided.

  Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments thereof.

Embodiment 1.
FIG. 1 is a perspective view showing an appearance of a television receiver 1 according to Embodiment 1 of the present invention.
2 and 3 are both longitudinal sectional views schematically showing the configuration of the display device 10 according to Embodiment 1 of the present invention. However, FIG. 2 shows a cross-section at a position where a light-shielding convex portion 34, which will be described later, projects (that is, a projecting position of the light-shielding convex portion 34), and FIG. A cross section at a non-projecting position of the light shielding convex portion 34 is shown.

2 and 3, illustration of a receiving unit 11, a signal processing unit 12, a rear cabinet 32, and the like, which will be described later, is omitted. The arrows shown in FIGS. 2 and 3 indicate the direction of light. 2 does not show the SOF 27 described later, and FIG. 3 does not show the flexible substrate 14 described later.
In the following, the left side of FIGS. 2 and 3 is referred to as the front side or the front side of the display device 10 (and thus the television receiver 1), and the right side of FIGS. The side. 2 and 3 are referred to as the right side (and the left side) of the display device 10 in the direction perpendicular to the plane of the drawing.

  FIG. 4 is a front view illustrating a configuration of a part of a panel unit (described later) included in the display device 10. The left side (and right side) of FIG. 4 is the left side (and right side) of the panel unit. The front side (and the back side) in the direction perpendicular to the plane of FIG. 4 is the front side (and the back side) of the panel unit. FIG. 4 shows a state where the panel unit is not yet attached to the front cabinet 31 described later. FIG. 4 shows the lower left corner of the panel unit, and illustration of the flexible substrate 14 is omitted.

First, the configuration of the television receiver 1 will be described with reference to FIG.
The television receiver 1 includes a display device 10, a receiving unit 11, a signal processing unit 12, and a stand 13.
The stand 13 is provided below the display device 10 and supports the display device 10 in a vertical posture.
The display device 10 includes a rectangular display panel 21 and a housing 100. The front part (and the rear part) of the housing 100 is formed by using a rectangular frame-shaped front cabinet 31 (and a rectangular tray-shaped rear cabinet 32).

The front cabinet 31 is formed by extrusion using a material having high thermal conductivity (for example, aluminum), and has a rectangular opening 31a at the center.
The rear cabinet 32 is made of, for example, an electrogalvanized steel sheet.
The front cabinet 31 and the rear cabinet 32 have substantially the same vertical and horizontal dimensions, and their peripheral portions are opposed to each other.
The front cabinet 31 functions as a cabinet in the embodiment of the present invention.

The receiving unit 11 and the signal processing unit 12 are built in the housing 100. The receiving unit 11 and the signal processing unit 12 may be externally attached to the display device 10.
The display device 10 displays an image based on the television broadcast received by the receiving unit 11. For this purpose, the receiving unit 11 receives a television broadcast from the outside via an antenna (not shown), and extracts a broadcast signal from the received television broadcast. The signal processing unit 12 outputs video data by performing predetermined signal processing on the broadcast signal extracted by the receiving unit 11.

The display panel 21 has a display surface 211 on the front side. The display panel 21 displays a video based on the video data output from the signal processing unit 12 on the display surface 211.
The display panel 21 is a liquid crystal display panel. The display panel 21 is housed in the casing 100 in a vertical posture so that an effective display area located at the center of the display surface 211 is exposed from the opening 31a. The vertical and horizontal dimensions (that is, the vertical and horizontal directions) of the display panel 21 are slightly larger than the vertical and horizontal dimensions of the opening 31a. Therefore, the front cabinet 31 surrounds the periphery of the display surface 211 of the display panel 21.

Next, the configuration of the display device 10 will be described in detail. Below, the structure of the vicinity of a lower side part (henceforth a peripheral lower side part) among the peripheral parts of the front cabinet 31 is mainly demonstrated. 2 and 3 show the configuration in the vicinity of the lower edge of the peripheral edge of the front cabinet 31. FIG.
First, the structure of the front cabinet 31 is further demonstrated, referring FIG.2 and FIG.3.
The front cabinet 31 includes a front frame portion 311 and a protruding frame portion 312.
The front frame portion 311 has a rectangular plate shape with an opening 31a formed at the center, and the front surface of the front frame portion 311 is exposed (that is, the outer surface).
The protruding frame portion 312 protrudes rearward from the outer edge portion of the front frame portion 311.

  An elastic member 33 for suppressing damage to the display panel 21 is provided on the opening edge portion of the opening 31a (that is, the inner edge portion of the front frame portion 311) on the back surface of the front frame portion 311 (that is, the inner surface of the front frame portion 311). It arrange | positions continuously or intermittently along the peripheral direction of the front frame part 311. FIG.

A plurality of light-shielding convex portions 34, 34,... And a heat radiating portion 37 project from the center portion of the inner surface of the front frame portion 311 in the vertical direction.
The light shielding convex portions 34, 34,... Are arranged in parallel in the peripheral direction (specifically, the left-right direction) of the peripheral lower side portion of the front frame portion 311. Further, the light shielding convex portions 34, 34,... Are located below the elastic member 33.
Each light-shielding convex portion 34 has a rectangular column shape in a horizontal posture, and protrudes from the inner surface of the front frame portion 311 in the rear direction, that is, from the front cabinet 31 to the light guide plate 23 described later, through a space S described later.

The heat radiating part 37 has a rectangular flat plate shape in a horizontal posture. One side of the heat radiating portion 37 is integral with the front frame portion 311. The heat radiating portion 37 is located below the light shielding convex portions 34, 34,... And above the protruding frame portion 312.
An LED substrate 26 described later is placed on the center in the front-rear direction of the upper surface 37 a of the heat radiating portion 37. Further, an insertion groove 371 into which circuit boards 281, 281 to be described later are inserted is formed on the upper surface 37 a in the vicinity of the base end portion of the heat radiating portion 37. The longitudinal direction of the insertion groove 371 is along the left-right direction.

  The insertion groove 371 partially penetrates the heat radiating part 37. There are a plurality of portions of the insertion groove 371 penetrating the heat radiating portion 37 corresponding to the light shielding convex portions 34, 34,. Below, the part which penetrates the thermal radiation part 37 of the insertion groove | channel 371 is called insertion hole 372,372, .... The insertion holes 372, 372,... Are positioned below the light shielding convex portions 34, 34,.

  Here, manufacture of the front cabinet 31 is demonstrated. First, the front frame portion 311, the protruding frame portion 312, the convex stripe portion to be the light shielding convex portions 34, 34,... And the convex plate portion to be the heat radiating portion 37 are integrally formed by extrusion molding. Next, the light-projecting convex portions 34, 34,... Are formed by partially cutting the formed convex strip portions and dividing the resulting strip into a plurality of portions. Further, the heat radiating portion 37 is formed by partially cutting the formed convex plate portion and providing the insertion groove 371 and the insertion holes 372, 372,. As a result, the front cabinet 31 is manufactured.

  Next, the configuration of the panel unit will be described with reference to FIGS. Here, a group of the display panel 21, optical sheet group 22, SOFs 27, 27,..., And circuit boards 281, 282,.

  The display panel 21 is illuminated from the back surface 212 side of the display panel 21 by an edge light type backlight described later. The display panel 21 includes a glass plate on the display surface 211 side and a glass plate on the back surface 212 side. Liquid crystal is disposed between the two glass plates, and the transmittance of the display panel 21 changes according to the voltage applied to the liquid crystal. Therefore, the light from the backlight is transmitted through the display panel 21 or blocked from passing through the display panel 21. As a result, an image is displayed on the display surface 211.

The backlight is configured using an optical sheet group 22, a light guide plate 23, a reflective sheet 24, LEDs 25, 25,. Of these, the optical sheet group 22 will be described next, and the others will be described later.
The optical sheet group 22 has a rectangular shape and is arranged in close contact with the central portion of the back surface 212 of the display panel 21. The vertical and horizontal dimensions of the optical sheet group 22 are smaller than the vertical and horizontal dimensions of the back surface 212 of the display panel 21. For this reason, the optical sheet group 22 does not cover the peripheral edge of the display panel 21. However, the vertical and horizontal dimensions of the optical sheet group 22 are larger than the vertical and horizontal dimensions of the effective display area of the display panel 21. That is, the optical sheet group 22 covers the effective display area of the display panel 21 from the back surface 212 side.

The plurality of SOFs 27, 27,... Are juxtaposed along the lower side portion 21a of the display panel 21 (specifically, in the left-right direction). Each SOF 27 includes a driver LSI (not shown) and a flexible substrate 271.
Each flexible substrate 271 has a belt-like shape, with one surface facing the front side, and is suspended from the lower side portion 21a of the display panel 21 so that the longitudinal direction is along the vertical direction. A driver LSI is mounted on the front surface or the other surface of the flexible substrate 271.
The driver LSI included in the SOF 27 is a drive circuit for the display panel 21. Specifically, the driver LSI applies an appropriate voltage to the liquid crystal of the display panel 21 in accordance with a display drive signal input from a signal circuit described later. As a result, the transmittance of the display panel 21 changes.

  The SOF 27 is electrically connected to the display panel 21 on the upper end side of the flexible substrate 271. The SOF 27 is electrically connected to any one of the plurality of circuit boards 281, 281,... Via the connector 291 on the lower end side of the flexible board 271.

  The circuit boards 281, 281,... Are juxtaposed along the lower side 21 a of the display panel 21. Each circuit board 281 is in the form of a horizontally long rectangular plate having non-translucency. A signal circuit (not shown) is mounted on one surface or the other surface of each circuit board 281. This signal circuit outputs a display drive signal based on the video data output from the signal processing unit 12 to the driver LSI included in the SOF 27.

  One long side portion of the circuit board 281 has a comb shape, and the other long side portion and the two short side portions each have a non-comb shape (straight shape). 4, the case where three recessed parts 281a, 281a,... Are formed in the comb-like long side part of the circuit board 281 is illustrated. The horizontal dimension of each of the recesses 281a, 281a,... And the distance between them corresponds to the horizontal dimension of each of the light-shielding convex parts 34, 34,. The comb-like long side portion of the circuit board 281 is the upper side portion in FIGS. 2 and 3 and the lower side portion in FIG. 4.

  A plurality of connectors 291 291,... And one connector 292 (or a plurality of connectors 292 292,..., Two in FIG. 4) are mounted on one surface of the circuit board 281. The surface on which the connectors 291 and 292 of the circuit board 281 are mounted is the front surface in FIGS. 2 and 3 and the back surface in FIG. The number of connectors 291, 291,... Corresponds to the number of SOFs 27, 27,... Electrically connected to the circuit board 281 (four in FIG. 4).

  The connectors 291, 291,... And the connectors 292 (or connectors 292, 292) are juxtaposed along the non-comb-like long sides of the circuit board 281. .. And the recesses 281a, 281a,... Are arranged in a staggered manner. In other words, the arrangement position of the connectors 291, 291... (And SOF 27, 27,...) In the left-right direction is different from the arrangement position of the recesses 281 a, 281 a,. On the other hand, the horizontal position of the connector 292 corresponds to the horizontal position of the recess 281a.

  The flexible substrate 14 has a strip shape, and one end side is electrically connected to the circuit board 281 via the connector 292, and the other end side is electrically connected to the receiving unit 11 and the signal processing unit 12.

The panel unit as described above is attached to the front cabinet 31 from the rear so that the peripheral portion of the display surface 211 of the display panel 21 is in contact with the elastic member 33.
At this time, the lower side part 21a of the display panel 21 and the lower side edge part of the front frame part 311 are both arranged along the left-right direction. At this time, the SOFs 27, 27,... Are disposed between the light-shielding convex portions 34, 34,. That is, the SOF 27 and the light shielding convex portion 34 are alternately arranged in the left-right direction.

Each circuit board 281 is arranged in a vertical posture so that each connector 291 and connector 292 mounted on the circuit board 281 face the front side. As a result, the back surface of each SOF 27 and the surface on which the connectors 291 and 292 of the circuit board 281 are mounted face each other.
The lower sides of the circuit boards 281, 281,... Arranged in a vertical position (that is, the non-comb-like long sides) are inserted into the insertion grooves 371. The flexible substrate 14 is inserted into the insertion hole 372 and pulled out below the heat radiating portion 37.
Further, the light shielding convex portions 34, 34,... Are fitted into the respective concave portions 281a, 281a,.

Next, the configuration of the LED unit will be described with reference to FIGS. 2 and 3. Here, a group of the LEDs 25, 25,... And the LED substrate 26 is referred to as an LED unit.
The LED substrate 26 is non-translucent and has a horizontally long rectangular plate shape. A plurality of LEDs 25, 25,... Juxtaposed in the longitudinal direction of the LED substrate 26 are mounted on one surface of the LED substrate 26.
The LEDs 25, 25,... And the LED substrate 26 function as a light source and a light source substrate in the embodiment of the present invention. The light source is not limited to the LEDs 25, 25,.

  The LED unit is attached to the front cabinet 31 after the panel unit is attached. Specifically, the LED unit is fixedly placed on the upper surface 37a of the heat radiating portion 37 with the surface of the LED substrate 26 on which the LEDs 25, 25,... Are mounted facing upward. At this time, the front end face of the LED board 26 is in contact with the back faces of the circuit boards 281, 281,. Moreover, LED25, 25, ... is opposingly arranged by the lower end surface 23b mentioned later of the light-guide plate 23. As shown in FIG.

Next, the configuration of the backlight will be described.
The light guide plate 23 has a rectangular plate shape, and is made of, for example, acrylic resin. The vertical and horizontal dimensions of the light guide plate 23 are larger than the vertical and horizontal dimensions of the display panel 21.
The light guide plate 23 uniformly emits light that has entered the light guide plate 23 from at least the lower end surface 23b of the light guide plate 23 from the front surface 23a and the rear surface of the light guide plate 23 (that is, emits light).

  The reflection sheet 24 is disposed in close contact with the back surface of the light guide plate 23. The vertical and horizontal dimensions of the reflection sheet 24 are larger than the vertical and horizontal dimensions of the light guide plate 23. For this reason, the light emitted from the back surface of the light guide plate 23 is reliably reflected by the reflection sheet 24 and enters the light guide plate 23 again.

  The light emitted from the LEDs 25, 25,... Is incident on the inside of the light guide plate 23 from the lower end surface 23 b of the light guide plate 23 directly or by being reflected by the reflection sheet 24 or the light shielding convex portion 34. The light incident on the inside of the light guide plate 23 is emitted from the front surface 23 a of the light guide plate 23. The light emitted from the front surface 23 a is diffused and collected by the optical sheet group 22 and enters the display panel 21 from the back surface 212 of the display panel 21. The light incident on the inside of the display panel 21 is emitted from the display surface 211 of the display panel 21. As a result, the display surface 211 of the display panel 21 is uniformly brightened.

  The backlight chassis 36 includes a support part 361 and an attachment part 362. The support part 361 has a rectangular plate shape. The light guide plate 23 and the reflection sheet 24 are attached to the support portion 361 such that one surface of the support portion 361 and the back surface of the reflection sheet 24 are brought into close contact with each other.

  In the backlight chassis 36, the central portion of the front surface 23a of the light guide plate 23 is in close contact with the back surface of the optical sheet group 22, and the lower side portion of the front surface 23a of the light guide plate 23 is the front end surface of the light shielding convex portions 34, 34,. The light guide plate 23 and the reflection sheet 24 are attached to the front cabinet 31 from the rear in a state where the light guide plate 23 and the reflection sheet 24 are held in a vertical posture so as to be in close contact with the rear surface of 281. At this time, the mounting portion 362 of the backlight chassis 36 is fixed to the front cabinet 31 using screws B, B,. As a result, the light guide plate 23 and the reflection sheet 24 are sandwiched between the light shielding convex portions 34, 34,... And the backlight chassis 36.

The receiving unit 11 and the signal processing unit 12 are disposed on the back surface of the support unit 361. Each flexible substrate 14 is electrically connected to the receiving unit 11 and the signal processing unit 12 through a through hole (not shown) formed in the backlight chassis 36.
The back of the backlight chassis 36 is covered by the rear cabinet 32.

  When the display device 10 is assembled as described above, a space S is formed between the peripheral portion (that is, the lower side portion 21a) on the LED 25, 25,... .

  However, in the display device 10 according to the present embodiment, the light shielding convex portions 34, 34,... Protrude from the inner surface of the front frame portion 311 of the front cabinet 31 to the lower side portion of the front surface 23 a of the light guide plate 23 through the space S. To do. In addition, a circuit board 281 is disposed between the adjacent light shielding convex portions 34, 34, that is, at a non-projecting position of the light shielding convex portion 34. More specifically, the upper side portion of the back surface of the circuit board 281 is in contact with the lower side portion of the front surface 23a of the light guide plate 23, and the lower end portion of the circuit board 281 is located inside the insertion groove 371 (that is, more than the LEDs 25, 25,. LED board 26 side). As a result, the space S is shielded from the LEDs 25, 25,.

Next, the effect of the display apparatus 10 of this Embodiment is demonstrated. For this purpose, first, the configuration of the conventional display device 10 will be described.
5 and 6 are both longitudinal sectional views schematically showing the configuration of the conventional display device 10, and correspond to FIG. 2 and FIG. However, in FIG. 5, illustration of the flexible substrate 14, the SOF 27, and the connectors 291 and 292 is omitted.
FIG. 7 is a front view showing a configuration of a part of a panel unit included in the conventional display device 10 and corresponds to FIG.
The configuration of the conventional display device 10 shown in FIGS. 5 to 7 is substantially the same as the configuration of the display device 10 of the present embodiment shown in FIGS. Therefore, the difference between the two will be described below.

  The conventional display device 10 includes a circuit board 280 instead of the circuit board 281 provided in the display device 10 of the present embodiment. Further, the LED unit included in the conventional display device 10 includes not only the LEDs 25, 25,... And the LED substrate 26, but also a heat sink 42 and an insulating sheet 43. Further, the heat dissipating part 37 is not provided in the front cabinet 31 provided in the conventional display device 10. Furthermore, a positioning groove 35 is provided in the front cabinet 31 provided in the conventional display device 10.

  The positioning groove 35 is provided in the central portion in the vertical direction of the inner surface of the front frame portion 311. The longitudinal direction of the positioning groove 35 is along the left-right direction. The positioning groove 35 is located below the light shielding convex portions 34, 34,... And above the protruding frame portion 312. The positioning groove 35 is used for positioning the heat sink 42.

The circuit board 280 is formed in the shape of a horizontally long rectangular plate having non-translucency like the circuit board 281, but the two long sides and the two short sides of the circuit board 280 are non-comb teeth, respectively. (Linear).
.. And a single connector 292 (or a plurality of connectors 292, 292,..., Two in FIG. 7) are mounted on one surface of the circuit board 280. The surface of the circuit board 280 on which the connectors 291 and 292 are mounted is the lower surface in FIGS. 5 and 6 and the front surface in FIG.

The connectors 291, 291,... Are juxtaposed along one long side of the circuit board 280 (the front side in FIGS. 5 and 6 and the upper side in FIG. 7). The connectors 292 (or connectors 292 and 292) are arranged (or juxtaposed) along the other long side portion of the circuit board 280 (the rear side portion in FIGS. 5 and 6 and the lower side portion in FIG. 7). The arrangement position of the connector 292 in the left-right direction corresponds to the arrangement position of the connector 291 in the left-right direction.
The lower end portion of the flexible board 271 is bent to the rear side, and the circuit board 280 is arranged in a horizontal posture so that the connectors 291 and the connectors 292 mounted on the circuit board 280 face downward.

The insulating sheet 43 is a horizontally long rectangular sheet and is made of polycarbonate.
The heat sink 42 is made of metal and has a horizontally long bar shape and an inverted L-shaped vertical cross-sectional shape. One side of the heat sink 42 is a rectangular plate-like substrate mounting portion 421 arranged in a horizontal posture, and the other side of the heat sink 42 is a rectangular plate-like housing mounting portion 422 arranged in a vertical posture.
The LED substrate 26 is fixedly mounted on the substrate mounting portion 421. At this time, the outer surface of the substrate mounting portion 421 and the other surface of the LED substrate 26 (that is, the surface where the LEDs 25, 25,... Are not mounted) are in contact, and further, the substrate mounting portion 421 and the LED substrate 26, respectively. The longitudinal directions of these are along each other.

An insulating sheet 43 is bonded to the inner surface of the substrate mounting portion 421 via an adhesive layer formed using a double-sided adhesive tape or an adhesive. At this time, the longitudinal directions of the substrate mounting portion 421 and the insulating sheet 43 are along each other.
A plurality of positioning projections 423, 423,... Juxtaposed in the longitudinal direction of the heat sink 42 are projected from the front end of the substrate platform 421. The protruding length of each positioning convex portion 423 from the front end portion of the substrate mounting portion 421 is appropriately longer than the depth of the positioning groove 35 (that is, the length in the front-rear direction). In addition, the thickness (that is, the length in the vertical direction) of each positioning protrusion 423 is slightly shorter than the opening width (that is, the length in the vertical direction) of the positioning groove 35.

In the LED unit, the outer surface of the substrate mounting portion 421, that is, the surface on which the LED substrate 26 is mounted is directed upward, and the inner surface of the substrate mounting portion 421, that is, the surface to which the insulating sheet 43 is bonded is directed downward. , And further, it is attached to the front cabinet 31 from the rear with the positioning convex portions 423, 423,.
At this time, the positioning convex portions 423, 423,... Are arranged between the SOFs 27, 27,. That is, the positioning protrusions 423 and the SOF 27 are alternately arranged in the left-right direction. As a result, the arrangement in the left-right direction of each positioning protrusion 423 and the arrangement in the left-right direction of each light-shielding protrusion 34 are the same.

Further, at this time, the positioning convex portions 423, 423,... Of the heat sink 42 are inserted into the positioning grooves 35 so that the tip end portions of the positioning convex portions 423 are in contact with the innermost portion of the positioning groove 35 of the front frame portion 311. Is done. As a result, the heat sink 42 is easily positioned in the vertical direction and the front-back direction.
When the heat sink 42 is accurately positioned, the LEDs 25, 25,... Are accurately opposed to the lower end surface 23 b of the light guide plate 23. Further, the insulating sheet 43 is interposed between the heat sink 42 and the circuit boards 281, 281,.

If the insulating sheet 43 does not exist, for example, an external force may be applied to the display device 10 to vibrate the circuit board 281 and contact with the heat sink 42 to cause a short circuit. However, since the insulating sheet 43 electrically insulates the circuit board 281 and the heat sink 42, occurrence of a short circuit is suppressed.
The positioned heat sink 42 is screwed to the front cabinet 31. More specifically, the housing mounting portion 422 of the heat sink 42 is fastened together with the front cabinet 31 using screws B, B,... Together with the mounting portion 362 of the backlight chassis 36.

  Here, light leakage in the display device 10 of the present embodiment and the conventional display device 10 will be described.

  Whether it is the display device 10 of the present embodiment or the conventional display device 10, as shown in FIGS. 2 and 5, the projecting position of the light-shielding convex portion 34 is the display panel from the LED 25, 25,. There is no light leakage space through which light can pass to the 21 side. This is because the light shielding convex portions 34, 34,... Protrude from the inner surface of the front frame portion 311 of the front cabinet 31 through the space S to the lower side portion of the front surface 23 a of the light guide plate 23. This is because the range from the inner surface to the lower side of the front surface 23a is closed. Therefore, the light emitted from the LEDs 25, 25,... Is incident on the inside of the light guide plate 23 from the lower end surface 23b of the light guide plate 23, either directly or by being reflected by the reflection sheet 24 or the light shielding convex portion 34 or the like. To do. For this reason, light leakage does not occur.

  However, as shown in FIG. 6, in the case of the conventional display device 10, a light leakage space exists at the non-projecting position of the light shielding convex portion 34. Therefore, of the light radiated from the LEDs 25, 25,..., The light that has not entered the light guide plate 23 is reflected by the back surface of the SOF 27, the front surface 23a of the light guide plate 23, and the like. The light is incident on the inside of the display panel 21 from the lower side portion 21 a of 212 (that is, the portion of the back surface 212 not covered with the optical sheet group 22) or the end surface of the lower side portion of the display panel 21. As a result, the portion corresponding to the non-projecting position of the light-shielding convex portions 34, 34,... At the lower portion of the display surface 211 becomes uselessly brighter than the other portions as if only this portion was separately illuminated by the searchlight. . That is, light leakage occurs. Accordingly, the image quality of the video displayed on the display surface 211 is deteriorated.

  On the other hand, as shown in FIG. 3, in the display device 10 of the present embodiment, there is no light leakage space at the non-projecting position of the light shielding convex portion 34. This is because the circuit board 281 closes the range from the lower side of the front surface 23 a of the light guide plate 23 to the front end face of the LED board 26. Therefore, the light emitted from the LEDs 25, 25,... That has not entered the light guide plate 23 is shielded by the circuit board 281, and therefore does not enter the display panel 21.

Further, the upper side portion of the back surface of the circuit board 281 is in contact with the lower side portion of the front surface 23 a of the light guide plate 23, and the lower end portion of the circuit board 281 is located inside the insertion groove 371. Therefore, for example, when the upper end surface of the circuit board 281 is arranged flush with the lower end face 23 b of the light guide plate 23, or the lower end face of the circuit board 281 is arranged flush with the upper surface of the LED board 26. Compared with the case where it is carried out, it is suppressed that light bypasses the circuit board 281 and passes through the light leakage space.
As a result, in the display device 10 of the present embodiment, light leakage is suppressed, so that the image quality of the video displayed on the display surface 211 is improved.

  By the way, the circuit board 281 corresponds to the circuit board 280 included in the conventional display device 10. Therefore, in the display device 10 of the present embodiment, it is not necessary to increase the number of parts only to suppress light leakage. Therefore, in order to suppress light leakage, the display device 10 (and thus the television receiver 1) is not hindered from being made thinner and narrower. In addition, unlike the conventional circuit board 280 arranged in the horizontal position, the circuit board 281 is arranged in the vertical position, which may contribute to the thinning of the display device 10.

In addition to the light shielding function, the light shielding convex portions 34, 34,... Have a sandwiching function for sandwiching the light guide plate 23 and the reflection sheet 24 with the backlight chassis 36. That is, the configuration of the front cabinet 31 is simpler and lighter than providing the front cabinet 31 with a portion having a light shielding function and a portion having a clamping function separately.
If the light-shielding convex portions 34, 34,... Do not exist, it is not necessary to provide the concave portions 281a, 281a,. At this time, the circuit board 281 may be common to the conventional circuit board 280.

Next, heat dissipation in the display device 10 of the present embodiment and the conventional display device 10 will be described.
Regardless of the display device 10 of the present embodiment or the conventional display device 10, the heat generated by the LEDs 25, 25,... Is once transmitted to the LED substrate 26.
In the conventional display device 10, the heat transmitted to the LED substrate 26 is transmitted to the heat sink 42, and then transmitted to the front cabinet 31 through the positioning protrusions 423 and the positioning grooves 35, for example, and released to the outside. Is done. However, if the heat sink 42 is distorted in shape or misaligned at the time of attachment, an unnecessary gap is formed between the positioning convex portion 423 and the inner surface of the positioning groove 35, so that the heat transfer efficiency is deteriorated. .

On the other hand, in the display device 10 according to the present embodiment, the heat transmitted to the LED substrate 26 is transmitted to the heat radiating portion 37, and then to the front cabinet 31, and released to the outside.
The conventional heat sink 42 is separate from the front cabinet 31, but the heat radiating portion 37 is integral with the front cabinet 31. Therefore, the display device 10 of the present embodiment has fewer parts than the conventional display device 10. As a result, the display device 10 of the present embodiment can achieve a narrower frame than the conventional one. Moreover, since there is no possibility that an unnecessary space is generated between the heat radiation part 37 and the front cabinet 31, heat transfer efficiency is good.

  If the front cabinet 31 included in the conventional display device 10 is replaced with the front cabinet 31 included in the display device 10 according to the present embodiment, the circuit boards 280, 280,... Therefore, the assembly of the display device 10 becomes complicated.

  In the display device 10 of the present embodiment as described above, the arrangement position and posture of the circuit board 281 are different from the arrangement position and posture of the circuit board 280. However, when manufacturing the display device 10 of the present embodiment, the circuit board 281 can be obtained by appropriately changing the shape of the circuit board 280 and the mounting position of the connector 291. That is, the circuit board 281 can be obtained with the minimum processing for the conventional circuit board 280. This is because if the flexible board 271 is bent, the arrangement position and posture of the circuit board 281 can be easily changed.

  By the way, in the conventional display device 10, the horizontal position of the connector 292 corresponds to the horizontal position of the connector 291. Temporarily, in the display device 10 of the present embodiment, if the arrangement position of the connector 292 in the left-right direction corresponds to the arrangement position of the connector 291 in the left-right direction, the arrangement of the flexible substrate 14 becomes difficult.

Embodiment 2. FIG.
Hereinafter, differences between the first and second embodiments will be described, and other parts corresponding to those of the first embodiment are denoted by the same reference numerals and description thereof will be omitted.
8 and 9 are both longitudinal sectional views schematically showing the configuration of the display device 10 according to Embodiment 2 of the present invention. However, FIG. 8 shows a cross section at a position where the light-shielding convex portion 34 is projected (that is, a projecting position of the light-shielding convex portion 34), and FIG. The cross section in the non-projecting position of the part 34 is shown. 8 and FIG. 9 correspond to FIG. 2 and FIG. 3 of the first embodiment, but FIG. 8 does not show the flexible substrate 14, the SOF 27, and the connectors 291 and 292.

FIG. 10 is a front view showing a configuration of a part of the panel unit included in display device 10 and corresponds to FIG. 4 of the first embodiment.
As shown in FIGS. 8 and 9, the heat radiating portion 37 in the present embodiment is provided with insertion holes 373, 373,... Instead of the insertion holes 372, 372,. The insertion hole 373 corresponds to the insertion hole 372 of the first embodiment, but the formation position in the left-right direction is different. Specifically, the insertion hole 373 of the present embodiment is located below the non-projecting position of the light shielding convex portion 34.

Next, the configuration of the panel unit will be described with reference to FIGS.
Similar to the panel unit of the first embodiment, the panel unit of the present embodiment includes a display panel 21, an optical sheet group 22, SOFs 27, 27,..., And a flexible substrate 14, and further includes the circuit of the first embodiment. Instead of the boards 281, 281,..., Circuit boards 282, 282,.

  The circuit board 282 corresponds to the circuit board 281 of the first embodiment. Also in the circuit board 282, as in the circuit board 281 of the first embodiment, one long side portion has a comb-tooth shape, and the other long side portion and the two short side portions each have a non-comb tooth shape. (Linear). However, the comb-like long side portion of the circuit board 282 is the upper side portion in FIGS. FIG. 10 illustrates a case where three concave portions 282a, 282a,... Are formed on the comb-like long side portion of the circuit board 282. The recesses 282a, 282a,... Correspond to the recesses 281a, 281a,.

.., And four connectors 292 (or two connectors 292, 292) are mounted on the circuit board 282 as well as the circuit board 281 of the first embodiment. However, these arrangement positions are different.
The surface on which the connectors 291 and the connectors 292 of the circuit board 282 are mounted is the front in both FIG. 8, FIG. 9, and FIG.

The connectors 291, 291,... Are juxtaposed along the longitudinal direction of the circuit board 282. The arrangement position of each connector 291 in the up-down direction is the central portion in the short direction of the circuit board 282. .. And the recesses 282a, 282a,... Are arranged in a staggered manner.
The connector 292 (or the connectors 292 and 292) is arranged (or juxtaposed) along one long side portion (the lower side portion in FIGS. 8 and 9 and FIG. 10) of the circuit board 282. The horizontal position of the connector 291 and the horizontal position of the connector 292 correspond to each other.

In other words, the arrangement positions of the connectors 291, 291,... (And SOFs 27, 27,...) And the connectors 292 in the left-right direction are different from the arrangement positions of the recesses 282a, 282a,.
Each SOF 27 includes a flexible substrate 272 whose longitudinal direction is shorter than that of the flexible substrate 271 instead of the flexible substrate 271 of the first embodiment. The SOF 27 is electrically connected to any one of the plurality of circuit boards 282, 282,... Via the connector 291 on the lower end side of the flexible board 272.

The panel unit as described above is attached to the front cabinet 31 from the rear so that the peripheral portion of the display surface 211 of the display panel 21 is in contact with the elastic member 33.
At this time, the lower side part 21a of the display panel 21 and the lower side edge part of the front frame part 311 are both arranged along the left-right direction. At this time, the SOFs 27, 27,... Are disposed between the light-shielding convex portions 34, 34,. That is, the SOF 27 and the light shielding convex portion 34 are alternately arranged in the left-right direction.

Each circuit board 282 is arranged in a vertical posture so that each connector 291 and connector 292 mounted on the circuit board 282 face the front side. As a result, the back surface of each SOF 27 and the surface on which the connectors 291 and 292 of the circuit board 282 are mounted face each other.
The lower side portions of the circuit boards 282, 282,... Arranged in a vertical posture (that is, the non-comb-like long side portions) are inserted into the insertion grooves 371. The flexible substrate 14 is inserted into the insertion hole 373 and pulled out below the heat radiating portion 37.
Further, the light shielding convex portions 34, 34,... Are fitted into the respective concave portions 282a, 282a,.

The display device 10 as described above also has a space S between the LED 25, the peripheral portion (that is, the lower side portion 21 a) on the back surface 212 of the display panel 21, and the LED substrate 26.
However, also in the display device 10 of the present embodiment, the light shielding convex portions 34, 34,... Protrude from the inner surface of the front frame portion 311 of the front cabinet 31 through the space S to the lower side portion of the front surface 23 a of the light guide plate 23. To do. Further, in the display device 10 according to the present embodiment, the circuit board 282 is disposed at the non-projecting position of the light shielding convex portion 34. More specifically, the upper side portion of the back surface of the circuit board 282 is in contact with the lower side portion of the front surface 23a of the light guide plate 23, and the lower end portion of the circuit board 282 is located inside the insertion groove 371 (that is, more than the LEDs 25, 25,. LED board 26 side). As a result, the space S is shielded from the LEDs 25, 25,.

  Therefore, in the display device 10 of the present embodiment, there is no light leakage space at the projecting position or the non-projecting position of the light shielding convex portion 34. Therefore, no light leakage occurs. As a result, the image quality of the video displayed on the display surface 211 is improved.

  Moreover, in the display device 10 according to the first embodiment, the front and rear surfaces of the circuit board 281 are switched between before and after the panel unit is attached to the front cabinet 31. For this purpose, the flexible substrate 271 must be bent more than before. Therefore, there is a possibility that unnecessary stress may occur in the flexible substrate 271. On the other hand, in the display device 10 of the present embodiment, the front and back surfaces of the circuit board 281 are not changed before and after the panel unit is attached to the front cabinet 31. Therefore, the flexible substrate 272 remains stretched. Therefore, there is no possibility that unnecessary stress is generated on the flexible substrate 272.

In the display device 10 according to the present embodiment, there is no particular problem even if the horizontal position of the connector 292 corresponds to the horizontal position of the recess 282a.
By the way, in Embodiment 1, 2, although the case where the display apparatus 10 was applied to the television receiver 1 provided with a receiving part was illustrated, it is not limited to this. The display device according to the present invention may be applied to an electric device that does not include a receiving unit, for example, a display for a personal computer.

The embodiment disclosed this time is to be considered as illustrative in all points and not restrictive. The scope of the present invention is not intended to include the above-described meanings, but is intended to include meanings equivalent to the claims and all modifications within the scope of the claims.
In addition, as long as the effect of the present invention is obtained, the television receiver 1 or the display device 10 may include components that are not disclosed in the first and second embodiments.

DESCRIPTION OF SYMBOLS 1 Television receiver 10 Display apparatus 11 Receiving part 21 Display panel 23 Light guide plate 25 LED (light source)
26 LED board (board)
271,272 Flexible substrate 281,282 Circuit board 31 Front cabinet (cabinet)
37 Heat sink S space

Claims (5)

A display panel having a display surface on the front side;
A light guide plate that is disposed on the back side of the display panel and emits light incident from the end face to the inside;
A light source disposed opposite to the end face;
A non-transparent light source substrate on which the light source is mounted;
A display device comprising: a circuit board for displaying an image on the display panel;
There is a space between the light source substrate and a peripheral portion on the light source side on the back surface of the display panel,
The display device according to claim 1, wherein the circuit board is non-translucent and is arranged so as to shield the space from the light source.   2. The display device according to claim 1, wherein a part of the circuit board is in contact with the light guide plate, and the other part is located closer to the light source board than the light source. Further comprising a flexible substrate attached to the display panel,
The display device according to claim 1, wherein the flexible substrate is electrically connected to the circuit substrate. A cabinet surrounding a peripheral edge of the display surface;
4. The heat sink according to claim 1, further comprising: a heat dissipating part that is provided integrally with the cabinet and to which the light source substrate is attached in order to release heat generated by the light source to the outside. The display device according to one. A display device according to any one of claims 1 to 4,
A receiver for receiving television broadcasts,
A television receiver, wherein an image is displayed on the display device based on a television broadcast received by the receiving unit.

Images