JP7087630B2 - Video display unit and video display device - Google Patents

Description

The present invention relates to a video display unit and a video display device including the video display unit.

The image display device is installed outdoors such as near a road, a sports facility, a building wall, etc., and provides various information to a person who sees the image. The video display device includes a plurality of video display units arranged in a matrix.

The video display device is installed outdoors and is exposed to rainwater. Therefore, waterproof performance is required for a plurality of light emitting devices arranged in the video display unit. For example, Patent Document 1 discloses a structure in which a lead frame that supplies electric power to a light emitting device is coated with a waterproof resin.

Japanese Unexamined Patent Publication No. 2012-54533

However, the conventional image display unit has a problem that water may infiltrate from the outer edge of the boundary surface between the package of the light emitting device and the sealing member, and the waterproof performance is not sufficient.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a video display unit having better waterproof performance than conventional ones, and a video display device including the video display unit.

The image display unit according to the present invention includes a circuit board, a plurality of light emitting devices arranged in a matrix on the circuit board, and a covering member formed on the circuit board to cover the circuit board. A package having a recess formed on the upper surface, a light emitting element arranged in the concave portion, and a sealing member filled in the concave portion to seal the light emitting element and further raised from the upper surface of the package. The covering member further covers the outer edge of the side surface of the package and the interface between the package and the sealing member. The covering member includes a first covering member that covers the circuit board, and a second covering member that covers the side surface of the package and the outer edge of the boundary surface between the package and the sealing member. The first covering member is a resin that absorbs visible light, and the second covering member is a resin that transmits the light emitted by the light emitting element.

According to the present invention, since the outer edge of the boundary surface between the package of the light emitting device and the sealing portion is covered with a covering member, an image display unit having better waterproof performance than the conventional one and an image display unit thereof are provided. Equipment can be provided.

It is a top view and the side view of the image display device which concerns on Embodiment 1 of this invention. It is a block diagram which shows the usage mode of the image display device which concerns on Embodiment 1 of this invention. It is a top view and the side view of the image display unit which concerns on Embodiment 1 of this invention. It is a top view, a front view, and a sectional view of the light emitting device which concerns on Embodiment 1 of this invention. It is a part of the sectional view of the image display unit which concerns on Embodiment 1 of this invention. It is explanatory drawing of the operation of the convex lens of the light emitting device which concerns on Embodiment 1 of this invention. It is a part of the sectional view of the image display unit which concerns on Embodiment 2 of this invention.

Embodiment 1.
The video display unit and the video display device according to the first embodiment of the present invention will be described with reference to the accompanying drawings. In each figure, the same or corresponding parts are designated by the same reference numerals, and the duplicated description thereof will be simplified or omitted as appropriate.
Further, for convenience of explanation, the size of the portion shown in each figure, the proportional relationship of the shape, and the like may be exaggerated.

The configuration of the video display device 1 will be described.
FIG. 1A is a plan view of the image display device 1 according to the first embodiment of the present invention. FIG. 1B is a side view of the image display device 1 according to the first embodiment of the present invention. As shown in FIG. 1, the video display device 1 includes a housing 2, a plurality of video display units 21 arranged in a matrix in the vertical and horizontal directions, and a display control unit 11 that controls the display of the video display unit 21. And prepare. The video display device 1 includes a plurality of video display units 21, and the plurality of video display units 21 are arranged in a matrix.

The shape of the housing 2 is a rectangular parallelepiped. As the material of the housing 2, a metal such as stainless steel or aluminum is used. Since the housing 2 is made of metal, it has waterproof performance and rigidity. As a result, the housing 2 can protect a part of the image display unit 21 and the display control unit 11 arranged inside the housing 2 from moisture, dust, and external force.

An opening is formed on one surface of the housing 2. A plurality of video display units 21 arranged in a matrix in the vertical direction and the horizontal direction are fitted into the opening in a watertight state. As will be described later, among the image display units 21, the circuit board 22 and the light emitting device 31 exposed to the outside of the housing 2 are covered with the covering member 23, so that the image display device 1 has waterproof performance.

Incidentally, in FIG. 1, in order to make it easy to understand how a plurality of video display units 21 are arranged in a matrix in the vertical direction and the horizontal direction, they are drawn so as to have a gap between adjacent video display units 21. However, in reality, there is no gap between the adjacent video display units 21, and the adjacent video display units 21 are in close contact with each other.

The video display device 1 includes a display screen 3 in which an arbitrary number of video display units 21 are arranged, and can realize an arbitrary size of the display screen 3. For example, the video display device 1 shown in FIG. 1 is a video display device 1 including video display units 21 arranged in two rows in the vertical direction and three rows in the horizontal direction. The image display device 1 is installed so that the display screen 3 faces the direction of the person viewing the image. Since the image display device 1 can realize an arbitrary size of the display screen 3, the size of the display screen 3 is increased to display a large image, and a person far away sees the image or a large number of people. Can watch the video at the same time.

FIG. 2 is a configuration diagram showing a usage mode of the video display device 1 according to the first embodiment of the present invention. As shown in FIG. 2, the display control unit 11 is an electric circuit provided in the video display device 1 and arranged on the circuit board 22. The display control unit 11 adjusts the brightness and color development of the light emitting device 31 including the light emitting element 33 by controlling the power supplied from a power source (not shown) to the individual light emitting elements 33 to adjust the brightness of the light emitting element 33. .. In this way, the display control unit 11 controls the display of the image displayed on the image display device 1.

As shown in FIG. 2, the video display device 1 is connected to the video signal source 13 via the controller 12. The video signal source 13 is, for example, a server that outputs a pre-stored video signal to the controller 12. The controller 12 converts the video signal input from the video signal source 13 according to the arrangement of the light emitting devices 31 in the video display device 1, determines the brightness and color development of each light emitting device 31, and causes the display control unit 11 to determine the brightness and color development. It is a computer that outputs.

In this way, the video display device 1 individually adjusts the brightness and color development of the light emitting devices 31 arranged in a matrix on the video display units 21 arranged in a matrix, and displays an image. .. Then, the image is changed with the passage of time, and a moving image (video) is displayed.

The configuration of the video display unit 21 will be described.
FIG. 3A is a plan view of the image display unit 21 according to the first embodiment of the present invention. FIG. 3B is a side view of the image display unit 21 according to the first embodiment of the present invention. As shown in FIG. 3, the image display unit 21 is formed on the circuit board 22, a plurality of light emitting devices 31 arranged in a matrix in the vertical and horizontal directions on the circuit board 22, and the circuit board 22. A covering member 23 that covers the circuit board 22 is provided. As shown in FIG. 3, the image display unit 21 includes light emitting devices 31 arranged in four rows in the vertical direction and four rows in the horizontal direction. As the distance between the adjacent light emitting devices 31, for example, 10 mm or 16 mm is used, but it is arbitrarily determined according to the resolution required for the image display unit 21 or the image display device 1.

A wiring pattern (not shown) is formed on the surface of the circuit board 22. The light emitting device 31 is electrically connected on the wiring pattern by soldering or the like. The electric power from the power source is supplied to each light emitting device 31 via the wiring pattern.

As the material of the circuit board 22, a glass epoxy resin obtained by impregnating a layer of glass fiber cloth with an epoxy resin is used, but other materials may be used.

The configuration of the light emitting device 31 will be described.
FIG. 4A is a plan view of the light emitting device 31 according to the first embodiment of the present invention. FIG. 4B is a front view of the light emitting device 31 according to the first embodiment of the present invention. FIG. 4C is a cross-sectional view taken along the line BB of the light emitting device 31 shown in FIG. 4A. As shown in FIG. 4, the light emitting device 31 is electrically connected to the package 32 having the recess 44 formed on the upper surface, the light emitting element 33 arranged in the recess 44 of the package 32, and the positive electrode of the light emitting element 33. The first lead frame 34, the second lead frame 35 electrically connected to the negative electrode of the light emitting element 33, the wire electrically connecting the negative electrode of the light emitting element 33 and the second lead frame 35, and the package 32. The recess 44 is filled, and the light emitting element 33 is sealed, and the sealing member 37 is formed so as to rise from the upper surface 41 of the package 32.

In the first embodiment of the present invention, as shown in FIG. 4, a so-called 3in1 type light emitting device 31 is used. Therefore, the light emitting device 31 has three light emitting elements 33r, 33g, 33b as the light emitting element 33, three first lead frames 34r, 34g, 34b as the first lead frame 34, and three third lead frames 35. Two lead frames 35r, 35g, 35b are used as wires, and three wires 36r, 36g, 36b are provided.

The shape of the package 32 is a rectangular parallelepiped. As shown in FIG. 4, the package 32 is formed with a recess 44 on the upper surface 41. The recess 44 has the shape of an inverted conical base and is a recess formed inside the package 32 from the upper surface 41. The concave portion 44 has the side surface 45 and the bottom surface 46 of the package 32 as the outer circumference in the shape of an inverted conical table.

In the recess 44 of the package 32, as shown in FIG. 4, the light emitting elements 33r, 33g, 33b, the first lead frame 34r, 34g, 34b, the second lead frame 35r, 35g, 35b, and the wire 36r, 36g, 36b Is placed. The light emitting elements 33r, 33g, and 33b are arranged in a row in the vertical direction.

The light emitting element 33r emits red light, the light emitting element 33g emits green light, and the light emitting element 33b emits blue light. The light emitting elements 33r, 33g, and 33b are individually supplied with arbitrary electric power, and individually emit light of arbitrary brightness. Therefore, the light emitting device 31 can realize arbitrary brightness and color development.

As the light emitting element 33, a compound semiconductor element such as a light emitting diode or a semiconductor laser is used. By adjusting the composition of indium (In), aluminum (Al), gallium (Ga), etc., the compound semiconductor element emits light to any wavelength such as red, green, and blue. Can be adjusted.

As shown in FIG. 4, the light emitting element 33r is arranged on the first lead frame 34r arranged on the bottom surface 46 of the recess 44 of the package 32. The positive electrode of the light emitting element 33r is electrically connected to the first lead frame 34r. The negative electrode of the light emitting element 33r is electrically connected to the second lead frame 35r arranged on the bottom surface 46 of the recess 44 of the package 32 via the wire 36r.

As shown in FIG. 4, the light emitting element 33g is arranged on the first lead frame 34g arranged on the bottom surface 46 of the recess 44 of the package 32. The positive electrode of the light emitting element 33g is electrically connected to the first lead frame 34g. The negative electrode of the light emitting element 33g is electrically connected to the second lead frame 35g arranged on the bottom surface 46 of the recess 44 of the package 32 via the wire 36g.

As shown in FIG. 4, the light emitting element 33b is arranged on the first lead frame 34b arranged on the bottom surface 46 of the recess 44 of the package 32. The positive electrode of the light emitting element 33b is electrically connected to the first lead frame 34b. The negative electrode of the light emitting element 33b is electrically connected to the second lead frame 35b arranged on the bottom surface 46 of the recess 44 of the package 32 via the wire 36b.

As the material of the first lead frames 34r, 34g, 34b and the second lead frames 35r, 35g, 35b, metals such as gold and copper are used. The first lead frames 34r, 34g, 34b, and the second lead frames 35r, 35g, 35b supply electric power from the power source to the light emitting element 33.

The shape of the first lead frame 34g is a plate shape. As shown in FIG. 4C, the first lead frame 34g has one end located on the bottom surface 46 of the recess 44 of the package 32, and is located on the left side of the recess 44 of the package 32 along the bottom surface 46 of the recess 44 of the package 32. Extending toward the side surface 45, from the left side surface 45 of the recess 44 of the package 32, passing through the inside of the package 32 and projecting to the bottom surface 43 of the package 32, along the bottom surface 43 of the package 32, the left side surface 42 of the package 32. It extends in the direction and projects from below the left side surface 42 of the package 32.

The first lead frames 34r and 34b also have the same shape, structure and function as the above-mentioned first lead frame 34g.

The shape of the second lead frame 35g is a plate shape. As shown in FIG. 4C, the second lead frame 35g has one end located on the bottom surface 46 of the recess 44 of the package 32, and is located on the right side of the recess 44 of the package 32 along the bottom surface 46 of the recess 44 of the package 32. Extending toward the side surface 45, from the right side surface 45 of the recess 44 of the package 32, passing through the inside of the package 32 and projecting to the bottom surface 43 of the package 32, along the bottom surface 43 of the package 32, on the right side surface 42 of the package 32. It extends in the direction and projects from below the right side surface 42 of the package 32.

The second lead frames 35r and 35b also have the same shape, structure and effect as the above-mentioned second lead frame 35g.

In this way, the first lead frames 34r, 34g, 34b and the second lead frames 35r, 35g, 35b are arranged so as to be partially embedded in the package 32. Therefore, since the first lead frames 34r, 34g, 34b and the second lead frames 35r, 35g, 35b are firmly fixed to the package 32, even when the image display device 1 is installed in a vibrating environment, it is electrically operated. You can avoid the disconnection.

The sizes of the first lead frames 34r, 34g, 34b and the second lead frames 35r, 35g, 35b are arbitrarily selected according to the size of the package 32 and the like.

The wires 36r, 36g, 36b are conductive wirings that electrically connect the light emitting elements 33r, 33g, 33b and the second lead frames 35r, 35g, 35b, respectively. As the material of the wires 36r, 36g and 36b, metals such as gold and copper are used.

Light emitting elements 33r, 33g, 33b, a part of the first lead frame 34r, 34g, 34b, a part of the second lead frame 35r, 35g, 35b, and a wire 36r, 36g, arranged in the recess 44 of the package 32. The 36b is sealed by the sealing member 37 filled in the recess 44 of the package 32. As a result, the light emitting elements 33r, 33g, 33b, a part of the first lead frame 34r, 34g, 34b, a part of the second lead frame 35r, 35g, 35b, and the wire 36r, 36g, 36b are separated from each other by moisture and dust. It can be protected from external forces.

The size of the package 32 is arbitrarily selected according to the pixel size and the like required for the video display unit 21. As the material of the package 32, a resin such as an epoxy resin is used. As the resin used for the package 32, a resin that absorbs the light emitted by the light emitting elements 33r, 33g, and 33b is used. This makes it possible to prevent color mixing of adjacent pixels.

As the sealing member 37, a resin such as a silicon resin is used. As the resin used for the sealing member 37, a resin that transmits the light emitted by the light emitting elements 33r, 33g, 33b, that is, a resin that is transparent to the light emitted by the light emitting elements 33r, 33g, 33b is used. As a result, the light emitted by the light emitting elements 33r, 33g, and 33b can be emitted to the outside of the light emitting device 31, and the person viewing the image display device 1 can perceive the image.

The sealing member 37 is filled in the recess 44 of the package 32 as follows. First, the sealing member 37 is injected into the recess 44 of the package 32 in a liquid state. The recess 44 of the package 32 is filled with a liquid-state sealing member 37. At this time, when an amount of the sealing member 37 exceeding the volume of the concave portion 44 of the package 32 is injected, the extra sealing member 37 forms a part of the convex lens from the upper surface 41 of the package 32 due to the action of surface tension. It's exciting. When the sealing member 37 is cured in this state, the concave portion 44 of the package 32 is filled, and the sealing member 37 is formed from the upper surface 41 of the package 32 so as to form a part of the convex lens. Here, the partial shape of the convex lens rising from the upper surface 41 of the package 32 corresponds to the shape of the plano-convex lens.

FIG. 5 is a diagram showing a part of a cross section of the image display unit 21 according to the first embodiment of the present invention as viewed from a position corresponding to the line AA shown in FIG. 3A. Since the sealing member 37 fills the recess 44 of the package 32, a boundary surface including the side surface 45 and the bottom surface 46 of the recess 44 of the package 32 is formed between the package 32 and the sealing member 37. Here, as shown in FIGS. 3 and 5, the boundary surface between the package 32 and the sealing member 37 when the outer edge portion 51 of the boundary surface between the package 32 and the sealing member 37 is not covered with the covering member. Is defined as the part that comes into contact with the external space. That is, the outer edge portion 51 of the boundary surface between the package 32 and the sealing member 37 is also a peripheral edge portion surrounding the sealing member 37 which is formed in a partial shape of a convex lens from the upper surface 41 of the package 32 and is raised.

FIG. 6 is a cross-sectional view of the light emitting device 31 shown in FIG. 4 (c), and is a diagram illustrating the operation of the convex lens. The operation of the convex lens exhibited by the sealing member 37 which is partially shaped and raised from the upper surface 41 of the package 32 will be described with reference to FIG. Assuming that the sealing member 37 does not form a part of the convex lens and is not raised, that is, assuming that the sealing member 37 is a horizontal plane, the light emitted by the light emitting element 33 is incident on the peripheral edge of the sealing member 37. It enters at an angle i ₀ and exits at a refraction angle r ₀ . However, in reality, since the sealing member 37 forms a part of the convex lens and rises, the light emitted by the light emitting element 33g is incident on the peripheral edge of the sealing member 37 at _an incident angle i1 and has a refraction angle. It _emits at r1. Since the incident angle i ₁ is smaller than the incident angle i ₀ , the refraction angle r ₁ is smaller than the refraction angle r ₀ . Therefore, when the sealing member 37 forms a part of the convex lens and is raised, the direction of the light emitted from the light emitting device 31 is close to the optical axis 61, the light collecting characteristic is improved, and the image display unit 21 is used. Can display clear images.

By the way, since the sealing member 37 is injected into the recess 44 of the package 32 in a liquid state, the sealing member 37 can be filled in the recess 44 of the package 32 without any gap. However, during long-term use, the package 32 and the sealing member 37 may repeatedly expand and contract, and the sealing member 37 may peel off from the side surface 45 of the recess 44 of the package 32. If no countermeasure is taken, water infiltrates through the gap formed between the side surface 45 of the recess 44 of the package 32 and the sealing member 37, and the light emitting elements 33r, 33g, 33b, the first lead frame 34r, 34g, 34b , The second lead frame 35r, 35g, 35b, or the wire 36r, 36g, 36b corrodes, which causes deterioration of the image displayed on the image display device 1.

Therefore, in the present invention, as shown in FIGS. 3 and 5, a structure is adopted in which the outer edge portion 51 of the boundary surface between the package 32 and the sealing member 37 is covered with the covering member 23.

The covering member 23 is formed on the circuit board 22 and covers the circuit board 22 as follows. The covering member 23 is injected in a liquid state between the individual light emitting devices 31 arranged in a matrix in the vertical direction and the horizontal direction on the circuit board 22. The injected covering member 23 first gradually spreads on the circuit board 22 and covers the circuit board 22. Further, when the covering member 23 is injected, the liquid level of the covering member 23 gradually rises. When the covering member 23 covers the outer edge portion 51 of the boundary surface between the package 32 and the sealing member 37, the injection of the covering member 23 is stopped. At this time, as shown in FIG. 5, the liquid level of the covering member 23 around the light emitting device 31 gradually rises and rises as it approaches the light emitting device 31 due to the action of surface tension. When the covering member 23 is cured in this state, the covering member 23 protrudes from below the side surface 42 of the circuit board 22, the package 32, and the first lead frames 34r, 34g, 34b, and the second lead frames 35r, 35g, 35b, A structure is formed in which the side surface 42 of the package 32 and the outer edge portion 51 of the boundary surface between the package 32 and the sealing member 37 are covered, and the covering member 23 gradually rises and rises as it approaches the light emitting device 31.

The covering member 23 thus formed covers the circuit board 22 and the first lead frames 34r, 34g, 34b and the second lead frames 35r, 35g, 35b protruding from below the side surface 42 of the package 32. Therefore, the wiring pattern formed on the circuit board 22 and the first lead frames 34r, 34g, 34b and the second lead frames 35r, 35g, 35b protruding from the lower side of the side surface 42 of the package 32 are corroded by moisture. Can be protected from.

Further, since the covering member 23 covers the outer edge portion 51 of the boundary surface between the package 32 and the sealing member 37, the sealing member 37 is peeled off from the side surface 45 of the recess 44 of the package 32 during long-term use. Even if it does, it prevents water from entering the gap generated between the side surface 45 of the recess 44 of the package 32 and the sealing member 37, and the light emitting elements 33r, 33g, 33b, the first lead frame 34r, 34g. , 34b, the second lead frame 35r, 35g, 35b, or the wires 36r, 36g, 36b can be protected from moisture corrosion.

Further, as shown in FIGS. 3 and 5, the covering member 23 covers the outer edge portion 51 of the boundary surface between the package 32 and the sealing member 37, and further forms a part of the convex lens from the upper surface 41 of the package 32. The peripheral portion of the raised sealing member 37 is also covered. Therefore, even if the sealing member 37 is peeled off from the side surface 45 of the recess 44 of the package 32 during long-term use and a gap is formed between the side surface 45 of the recess 44 of the package 32 and the sealing member 37. , Water can be reliably prevented from entering the gap.

As the covering member 23, a resin such as a silicon resin is used. The resin used for the covering member 23 is a resin that absorbs visible light such as sunlight, that is, a resin that is opaque to visible light. Since the covering member 23 absorbs visible light, it is possible to suppress reflection of external light such as sunlight on the surface of the circuit board 22, and it is possible to improve the contrast of the image displayed on the image display unit 21.

As described above, in the first embodiment of the present invention, since the covering member 23 covers the outer edge portion of the boundary surface between the package 32 of the light emitting device 31 and the sealing portion, the image display having superior waterproof performance as compared with the conventional case. It is possible to provide a unit 21 and an image display device 1 including the image display unit 21.

Embodiment 2.
The video display unit 21 and the video display device 1 according to the second embodiment of the present invention will be described with reference to the attached drawings. In the description of the video display unit 21 and the video display device 1 according to the second embodiment, common reference numerals are used for the components common to the configurations of the video display unit 21 and the video display device 1 according to the first embodiment. , Part or all of the description may be omitted as appropriate.

FIG. 7 is a diagram showing a part of a cross section of the image display unit 21 according to the second embodiment of the present invention as viewed from a position corresponding to the line AA shown in FIG. 3A. As shown in FIG. 7, the image display unit 21 is formed on the circuit board 22, a plurality of light emitting devices 31 arranged in a matrix in the vertical and horizontal directions on the circuit board 22, and the circuit board 22. A first covering member 24 that covers the circuit board 22 and a second coating that is formed on the circuit board 22 and covers the side surface 42 of the package 32 and the outer edge portion 51 of the boundary surface between the package 32 and the sealing member 37. A member 25 is provided.

The first covering member 24 and the second covering member 25 are formed on the circuit board 22 as follows. First, as in the first embodiment, the second covering member 25 is injected in a liquid state between the individual light emitting devices 31 arranged in a matrix in the vertical and horizontal directions on the circuit board 22. To. The injected second covering member 25 first gradually spreads on the circuit board 22 and covers the circuit board 22. Further, when the second covering member 25 is injected, the liquid level of the second covering member 25 gradually rises. When the second covering member 25 covers the outer edge portion 51 of the boundary surface between the package 32 and the sealing member 37, the injection of the second covering member 25 is stopped. At this time, the liquid level of the second covering member 25 around the light emitting device 31 gradually rises and rises as it approaches the light emitting device 31 due to the action of surface tension. When the second covering member 25 is cured in this state, the second covering member 25 projects from below the side surface 42 of the circuit board 22, the package 32, the first lead frames 34r, 34g, 34b, and the second lead frame 35r. A structure that covers 35 g, 35b, the side surface 42 of the package 32, and the outer edge portion 51 of the boundary surface between the package 32 and the sealing member 37, and the second covering member 25 gradually rises and rises as it approaches the light emitting device 31. Is formed.

Next, the periphery of each light emitting device 31 arranged in a matrix in the vertical direction and the horizontal direction on the circuit board 22 is masked by a mask member (not shown). The second covering member 25 of the portion not masked by the mask member is removed from the top of the circuit board 22 by etching. The mask member is removed.

Next, the first covering member 24 is injected in a liquid state into the portion from which the second covering member 25 has been removed. The injected first covering member 24 gradually spreads on the circuit board 22 in the portion where the second covering member 25 is removed, and covers the circuit board 22. Further, when the first covering member 24 is injected, the liquid level of the first covering member 24 gradually rises. Before the height H1 of the liquid level of the first covering member 24 reaches the height H2 of the second covering member 25 that remains without being removed at the connection portion between the first covering member 24 and the second covering member 25. In addition, the injection of the first covering member 24 is stopped. When the first covering member 24 is cured in this state, the height H1 of the first covering member 24 from the circuit board 22 becomes the height H1 from the circuit board 22 at the connection portion between the first covering member 24 and the second covering member 25. A structure lower than the height H2 of the second covering member 25 is formed.

Since the first covering member 24 formed in this way covers the circuit board 22, the wiring pattern formed on the circuit board 22 can be protected from corrosion due to moisture.

Further, the second covering member 25 covers the first lead frames 34r, 34g, 34b and the second lead frames 35r, 35g, 35b protruding from the lower side of the side surface 42 of the package 32, so that the second covering member 25 covers the side surface 42 of the package 32. The first lead frames 34r, 34g, 34b and the second lead frames 35r, 35g, 35b protruding from below can be protected from corrosion due to moisture.

Further, since the second covering member 25 covers the outer edge portion 51 of the boundary surface between the package 32 and the sealing member 37, the sealing member 37 is formed from the side surface 45 of the recess 44 of the package 32 during long-term use. Even if it is peeled off, it prevents water from entering the gap formed between the side surface 45 of the recess 44 of the package 32 and the sealing member 37, and the light emitting elements 33r, 33g, 33b, and the first lead frame 34r. , 34g, 34b, the second lead frame 35r, 35g, 35b, or the wires 36r, 36g, 36b can be protected from moisture corrosion.

Further, as shown in FIGS. 3 and 7, the second covering member 25 covers the outer edge portion 51 of the boundary surface between the package 32 and the sealing member 37, and further has a partial shape of the convex lens from the upper surface 41 of the package 32. The peripheral portion of the sealing member 37 that has been raised is also covered. Therefore, even if the sealing member 37 is peeled off from the side surface 45 of the recess 44 of the package 32 during long-term use and a gap is formed between the side surface 45 of the recess 44 of the package 32 and the sealing member 37. , Water can be reliably prevented from entering the gap.

As the first covering member, a resin such as a silicon resin is used. The resin used for the first covering member 24 is a resin that absorbs visible light such as sunlight, that is, a resin that is opaque to visible light. As a result, it is possible to suppress the reflection of external light such as sunlight on the surface of the circuit board 22, and it is possible to improve the contrast of the image displayed on the image display unit 21.

As the second covering member, a resin such as a silicon resin is used. The resin used for the second covering member 25 is a resin that transmits the light emitted by the light emitting elements 33r, 33g, 33b, that is, a resin that is transparent to the light emitted by the light emitting elements 33r, 33g, 33b. As a result, even if the second covering member 25 covers the peripheral portion of the sealing member 37 which is formed in a partial shape of a convex lens from the upper surface 41 of the package 32 and is raised, the light emitted by the light emitting elements 33r, 33g, 33b is emitted. Can be efficiently emitted to the outside of the image display unit 21, so that the power consumption of the image display unit 21 can be reduced.

Injection of the first covering member 24 is stopped before the height H1 of the liquid surface reaches the height H2 of the second covering member 25 which remains without being removed. Therefore, it is possible to prevent a situation in which the first covering member 24 covers the light emitting device 31 due to an excessive injection amount of the first covering member 24 that absorbs visible light, and the light emitting device 31 cannot develop a color. Further, since the injection amount of the first covering member 24 is small, the cost of the first covering member 24 can be reduced.

As described above, in the second embodiment of the present invention, since the second covering member 25 covers the outer edge portion of the boundary surface between the package 32 of the light emitting device 31 and the sealing portion, the waterproof performance is superior to the conventional one. It is possible to provide a video display unit 21 and a video display device 1 including the video display unit 21.

Further, in the second embodiment of the present invention, the second covering member 25 through which the light emitted by the light emitting elements 33r, 33g, 33b transmits is the outer edge portion 51 of the interface between the package 32 and the sealing member 37, and the package. The peripheral portion of the sealing member 37, which is a part of the convex lens formed from the upper surface 41 of the 32 and is raised, is covered, and the light emitted by the light emitting elements 33r, 33g, 33b is efficiently emitted to the outside of the image display unit 21. Therefore, the power consumption of the image display unit 21 and the image display device 1 can be reduced.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and within the scope of the invention, the embodiments can be freely combined or the embodiments can be combined. Can be changed or omitted as appropriate.

For example, although a plurality of light emitting devices 31 arranged in a matrix in the vertical direction and a horizontal direction are shown on the circuit board 22, a plurality of light emitting devices 31 arranged in a matrix in the diagonal direction may be used.

Further, the video display unit 21 is provided with the light emitting devices 31 arranged in 4 rows in the vertical direction and 4 rows in the horizontal direction, but the number of other units such as 5 rows in the vertical direction and 10 rows in the horizontal direction is available. The light emitting device 31 arranged may be provided.

Further, although the light emitting device 31 is a so-called 3in1 type light emitting device 31, it may be another type of light emitting device 31 such as a so-called 1in1 type light emitting device 31.

Further, although it is assumed that the three light emitting elements 33r, 33g, and 33b are arranged in a row in the vertical direction in the recess 44 of the package 32 of one light emitting device 31, the three light emitting elements 33r, 33g, and 33b are arranged in a row in the horizontal direction. It may be arranged without lining up in a row.

Further, the positive electrodes of the light emitting elements 33r, 33g, 33b and the first lead frames 34r, 34g, 34b are electrically connected, respectively, and the negative electrodes of the light emitting elements 33r, 33g, 33b and the second lead frames 35r, 35g, 35b. However, conversely, the positive electrodes of the light emitting elements 33r, 33g, 33b and the second lead frames 35r, 35g, 35b are electrically connected, respectively, and the negative electrodes of the light emitting elements 33r, 33g, 33b. And the first lead frames 34r, 34g, and 34b may be electrically connected to each other.

Further, although it is assumed that a concave portion in the shape of an inverted conical table is formed on the upper surface 41 of the package 32, the shape is not limited to the shape of the inverted conical table, and other shapes such as the shape of the inverted pyramid table may be used.

Further, the height H1 of the liquid level of the first covering member 24 is lower than the height H2 of the second covering member 25, but conversely, the height H1 of the liquid level of the first covering member 24 is the second. The height of the covering member 25 may be higher than H2.

1 Video display device, 2 chassis, 3 display screen, 11 display control unit, 12 controller, 13 video signal source, 21 video display unit, 22 circuit board, 23 covering member, 24 first covering member, 25 second covering member , 31 light emitting device, 32 packages, 33, 33r, 33g, 33b light emitting element, 34, 34r, 34g, 34b first lead frame, 35, 35r, 35g, 35b second lead frame, 36r, 36g, 36b wire, 37. Sealing member, 41 package top surface, 42 package side surface, 43 package bottom surface, 44 package recess, 45 package recess side surface, 46 package recess bottom surface, 51 outer edge of the interface between the package and the sealing member Part, 61 optical axis

Claims (4)

With the circuit board
A plurality of light emitting devices arranged in a matrix on the circuit board,
A covering member formed on the circuit board and covering the circuit board,
Equipped with
The light emitting device is
A package with a recess on the top surface and
The light emitting element arranged in the recess and
A sealing member that is filled in the concave portion, the light emitting element is sealed, and is further raised from the upper surface of the package.
Have,
The covering member further covers the side surface of the package and the outer edge portion of the boundary surface between the package and the sealing member .
The covering member is
The first covering member that covers the circuit board and
A second covering member that covers the outer edge of the side surface of the package and the boundary surface between the package and the sealing member.
Equipped with
The first covering member is a resin that absorbs visible light.
The second covering member is a resin that transmits the light emitted by the light emitting element.
Video display unit. Of the sealing member, the portion formed by rising from the upper surface of the package forms a part of the convex lens.
The video display unit according to claim 1. At the connection portion between the first covering member and the second covering member, the height of the first covering member from the circuit board is lower than the height of the second covering member from the circuit board.
The video display unit according to claim 1 or 2 . A plurality of video display units according to any one of claims 1 to 3 are provided.
The plurality of video display units are video display devices arranged in a matrix.

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