JP5744646B2 - Video display device - Google Patents

Description

  The present invention relates to a full-color video display device that performs display by causing a number of light emitting elements such as R (red), G (green), and B (blue) to emit light.

  In general, an image display apparatus is configured by arranging a large number of display units each composed of a light emitting element or the like on a plane. Light emitting diodes (LEDs) have come to be used as light emitting elements, and the arrangement and arrangement pitch of the light emitting elements can be designed arbitrarily, so that video display devices with various resolutions and brightness can be configured according to the application. It was. In general, a display unit, which is the smallest structural unit of an image display device, is a substrate in which a large number of light emitting elements of R (red), G (green), and B (blue), which are single colors, two colors, or three primary colors of light, are arranged. A plate having a flat plate, a cylindrical lens, or a collective plate of convex lenses arranged on the front surface is known.

  FIG. 12 is a view showing a display unit 100 which is the minimum structural unit of a conventional video display device, FIG. 12 (a) is a schematic front view of the display unit 100, FIG. 12 (b) is a cross-sectional view along CC line, FIG. 12 (c) is a DD cross-sectional view, and one display unit 100 has a configuration in which a plurality of solid light sources are arranged in a matrix (matrix arrangement), and is a 1 in 1 LED (one in one LED) that is one solid light source. The LED chip, which is one light emitting element, is mounted on the light emitting element 7. For example, as shown in FIGS. 12 and 13, in one display unit 100, 1 in 1 LED light emitting elements 7 corresponding to a solid light source are arranged in 4 rows and 4 columns.

As shown in FIG. 13, one of the red LED chip 7a, the green LED chip 7b, and the blue LED chip 7c as one light emitting element is mounted on the 1 in 1 LED light emitting element 7 that is a solid light source. , R (red) x 2, G (green) x 1 and B (blue) x 1 in 2 rows and 2 columns are picture elements 8 and picture element pitches are PX1 and PY1, 1 in 1 LED light emitting element The outer dimensions of 7 are the horizontal direction LX1 and the vertical direction LY1, and correspond to the dimension obtained by adding the solid light source of 2 rows and 2 columns and the gap between the picture elements.

In the video display device using the 1 in 1 LED light emitting element 7, in order to achieve higher resolution, the pixel pitches PX1 and PY1 may be reduced, but the outer dimensions LX1 of the 1 in 1 LED light emitting element 7, It is impossible to set the pixel pitch below LY1, and 1 in 1 LED
Reducing the external dimensions of the light-emitting element 7 also has a physical dimension limit. Further, since three primary colors of R (red), G (green), and B (blue) are necessary for full color display, at least one 1-in-1 LED light-emitting element 7 for each RGB is required, which is costly. It will be high.
Therefore, in recent years, in a general video display device, a 3 in 1 LED light emitting element in which three LED chips are arranged in one package has begun to be widely adopted.

  In addition, a technique in which a cylindrical lens or a convex lens is disposed in front of the 1 in 1 LED light emitting element 7 or the 2 in 1 LED light emitting element to increase the front luminance is described in the conventional literature (for example, Patent Document 1 and Patent Reference 2).

JP-A-6-104488 Japanese Patent Application Laid-Open No. 6-1044889

In the conventional video display device, when the number of LED chips arranged in one solid-state light source is one, the front luminance is kept high even if the incident surface of the lens arranged in front of the light emitting element is a flat surface. It was possible. In addition, in the 2 in 1 LED light emitting element, the front luminance can be secured by using a long cylindrical lens in the direction in which the LEDs are arranged.
However, when a lens with a substantially hemispherical surface shape is arranged on the front surface of one solid-state light source, in the 3 in 1 LED light emitting device in which the LED chips are arranged in three rows, the traveling directions of the respective LED chips are different. Thus, there is a problem that good image quality cannot be obtained.
The present invention has been made to solve the above-described problem, and is an image display device using a lens having a substantially hemispherical surface shape, and includes a plurality of LED chips such as a 3 in 1 LED light emitting element. An object of the present invention is to obtain an image display device with good image quality using a nin 1 LED light emitting element arranged in a solid light source.

An image display apparatus according to the present invention includes a solid-state light source in which a plurality of light-emitting elements are mounted in a single package, a substrate on which the plurality of solid-state light sources are mounted in a matrix, the substrate facing the substrate, A matrix lens that is disposed in the vicinity of the light emitting surface portion, has one lens action surface portion corresponding to one of the solid light sources, and has a plurality of lens action surface portions arranged in a matrix; In the lens working surface portion, an incident surface portion where a light beam emitted from the light emitting element is incident in parallel to a predetermined axis and an exit surface portion from which the light beam is emitted are formed rotationally symmetrically about the axis, and the incident surface portion Has a concave surface portion centered on the axis and a ring-shaped convex surface portion formed from the outer periphery to the outside of the concave surface portion, and the output surface portion is a convex surface portion centered on the axis. Yes, and a plurality of light emitting elements mounted in one of the package are spaced apart from each other on the circumference of one around the said axis which is the center of the lens function surface portion, the circumference , Facing the ring-shaped convex surface portion of the incident surface portion.
Furthermore, an image display apparatus according to the present invention includes a solid state light source in which a plurality of light emitting elements are mounted in a single package, a lens action surface portion disposed adjacent to and in close proximity to the light emitting surface portion of the solid state light source, In the lens working surface portion, an incident surface portion where a light beam emitted from the light emitting element is incident in parallel to a predetermined axis and an exit surface portion from which the light beam is emitted are formed rotationally symmetrically about the axis, and the incident surface portion Has a concave surface portion centered on the axis and a ring-shaped convex surface portion formed from the outer periphery to the outer side of the concave surface portion, and the output surface portion has a convex surface portion centered on the axis, The plurality of light emitting elements mounted in the lens are spaced apart from each other on one circumference centered on the axis that is the center of the lens action surface portion, and the circumference is the rebound of the incident surface portion. Those facing the grayed-shaped convex portion.

  According to the video display device of the present invention, the incident surface portion of the matrix lens has a concave surface portion formed in a circle around the axis center, and a composite surface shape formed with a ring-shaped convex surface portion formed from the outer periphery of the concave surface portion to the outside. Thus, when any light ray of the plurality of light emitting elements is incident on the ring-shaped convex surface portion, the effect of the composite surface shape of the matrix lens incident surface portion suppresses the optical axis shift of the light beam and increases the divergence angle. It can be made smaller.

It is a figure which shows the element arrangement | sequence at the time of using 3 in 1 LED light emitting element for the video display apparatus of this invention. It is the front view and sectional drawing of the display unit of the video display apparatus of Embodiment 1 of this invention. It is sectional drawing of one solid light source and a lens action surface part of the video display apparatus of Embodiment 1 of this invention, and a principal part expanded sectional view. It is the front view and sectional drawing of a display unit of the image display apparatus provided with the conventional lens required for description of this invention. It is sectional drawing of one solid light source provided with the conventional lens required for description of this invention. It is a figure which shows the light distribution characteristic of 3in1LED light emitting element of Embodiment 1 of this invention. It is a figure which shows the light distribution characteristic of 3in1LED light emitting element which is not provided with a lens required for description of this invention. It is a figure which shows the light distribution characteristic of 3in1LED light emitting element provided with the lens with a flat entrance plane required for description of this invention. It is the top view which showed the example of LED chip arrangement | positioning of 5 in 1 LED light emitting element of Embodiment 2 of this invention. It is the front view and sectional drawing of the display unit of the video display apparatus provided with the lens which adjusts the light transmittance of Embodiment 3 of this invention. It is the front view and sectional drawing of the display unit of the video display apparatus provided with the lens coat | covered with the light transmittance adjustment film | membrane of Embodiment 4 of this invention. It is the front view and sectional drawing of the display unit of the conventional video display apparatus. It is a figure which shows the element arrangement | sequence at the time of using the conventional 1in1LED light emitting element.

Embodiment 1 FIG.
In response to the current demand for higher brightness, the following configuration can be recalled by combining conventional background techniques for higher brightness.
In the conventional video display device in which the 1 in 1 LED light emitting element 7 in FIG. 12 is provided with a lens having a convex emission surface and a flat back surface, the 1 in 1 LED light emitting element 7 is replaced with the 3 in 1 LED light emitting element 2. (Shown in FIG. 1) to increase the luminance. A configuration based on a combination of conventional techniques is shown in FIG. FIG. 5 is an enlarged cross-sectional view of one solid-state light source of the EE cross section shown in FIG. 4, and additionally shows the ray trajectories emitted from the LED chips 2a and 2b.

In addition, nin 1LED typified by 2in 1LED light emitting element and 3in 1LED light emitting element
When a plano-convex lens 900 is arranged in front of the light emitting element (n: integer of 2 or more), as shown in FIG. 5, R (red), G (green), and B (blue) LED chips constituting the 3 in 1 LED light emitting element 2 The divergent rays emitted from 2a, 2b, and 2c are incident on the incident surface 9b, which is the plane of the plano-convex lens 900, from the vertical direction. Since the optical axis of the convex lens 900 is different from that of the convex lens 900, the principal ray is greatly bent after exiting the exit surface 9a which is a convex surface (substantially hemisphere) of the plano-convex lens 900, and deviates from the front.

After all, after exiting the plano-convex lens 900, the light beams emitted from the LED chips 2a, 2b, and 2c have different traveling directions, and color shift occurs when viewing from a distance, and the image quality of the image display device There were problems such as damage.
Therefore, in the present invention, instead of the plano-convex lens 900, the lens 400 having a concave surface portion and a ring-shaped convex surface portion surrounding the periphery is used to solve the above-described problem and to increase the luminance of the light emitting element. In addition, the present invention provides a high-resolution full-color video display device with small color shift and high resolution.

Embodiment 1 of the present invention will be described below. FIG. 1 is a diagram showing an element arrangement in the case of using a 3 in 1 LED light emitting element which is an image display device of the present invention. FIG. 2 is a diagram showing a display unit 1 which is the minimum structural unit of the video display apparatus according to Embodiment 1 of the present invention. FIG. 2 (a) is a schematic front view of the display unit 1, and FIG. 2 (b). Is a cross-sectional view in the direction of gravity along the arrangement line of the LED chips (indicated by reference numerals 2a, 2b, 2c) of the 3-in-1 LED light-emitting element 2 corresponding to one solid-state light source, FIG. 2 (c) These are BB sectional drawing which is sectional drawing of the horizontal direction orthogonal to FIG.2 (b).
As shown in FIG. 2, the display unit 1 includes a substrate in which a plurality of 3-in-1 LED light-emitting elements 2 are arranged in a matrix on a wiring board 3, and a plurality of lens operating surfaces corresponding to one solid-state light source in a matrix. It is mainly configured by an array of integrated matrix lenses 4, a louver 5 that shields external light from sunlight, illumination, and the like, and a housing case 6.

As shown in FIG. 1, the 3-in-1 LED light-emitting element 2 has three primary colors R (red), G (green), and B (blue) LED chips 2a, 2b, and 2c arranged in a single package. It is a surface-mounted 3in1LED light emitting element mounted. By using the 3 in 1 LED light emitting element 2 as the solid light source of the display unit 1, the element arrangement of the display unit 1 as shown in FIG. 1 is possible. In the case of FIG. 1, one 3 in 1 LED light emission is possible. Since the element 2 becomes the picture element 8, the picture element pitches are PX2 and PY2, and the outer dimensions of the 3 in 1 LED light emitting element 2 are the horizontal direction LX2 and the vertical direction LY2, and one solid light source (picture element 8) This corresponds to the dimension with the gap between picture elements added.
For example, assuming that the outer dimensions of the 1 in 1 LED light emitting element 7 and the 3 in 1 LED light emitting element 2 are the same, the pixel pitches PX2 and PY2 of the 3 in 1 LED light emitting element 2 are 1 in 1 LED light emitting element 7 The pixel pitches PX1 and PY1 can be reduced to half, and high resolution can be easily achieved at low cost.
The light emitting element (LED chip) is composed of a light emitting diode.
Here, the matrix lens 4 is formed of a transparent resin typified by, for example, polycarbonate resin, acrylic resin, epoxy resin, or the like.
The louver 5 is a black louver formed of a black resin having a high external light shielding property.

Next, operations and effects of the video display apparatus according to Embodiment 1 of the present invention will be described.
FIG. 3 (a) is an enlarged view showing the locus of light emitted from the LED chip in the AA cross section of FIG. 2 when the 3in1 LED light emitting element 2 is used as the solid-state light source of the video display device according to the first embodiment. ) Is an enlarged sectional view of the lens shown in FIG. In addition, the light emission surface part of a solid light source is a mounting surface of an LED chip.
As shown in FIG. 3 (a), in the video display device according to Embodiment 1 of the present invention, near the front of the n in 1 LED light emitting element (n: an integer of 2 or more), on both sides of the incident surface exit surface. A lens 400 having a lens structure is disposed. The lens 400 is provided with a rotationally symmetric structure for both the exit surface (exit surface portion) 4a and the entrance surface (incident surface portion) 4b. In the cross section passing through the rotational symmetry axis, the exit surface 4a is convex and the entrance surface 4b is A composite surface having a concave concave surface portion 4b1 on the light source side that has the same optical axis as the emission surface 4a, and a ring-shaped convex surface portion 4b2 that protrudes outward from the outer peripheral end of the concave surface portion 4b1 to the light source side. Shape.

The composite surface shape of the entrance surface 4b of the lens 400 will be described in more detail. As shown in FIG. 3B, the concave surface portion 4b1 has an axial center and a radius between the LED chips 2a-2b (or 2b-2c). A ring-shaped convex surface portion 4b2 that is formed in a circular shape that is less than the interval and extends from the outer periphery of the concave surface portion 4b1 to the outside with a predetermined width is formed. The concave surface portion 4b1 has a shape in which the surface of the lens 400 is recessed rather than the broken line connecting the axis and the outer periphery of the concave surface portion 4b1. In the ring-shaped convex surface portion 4b2, the surface of the lens 400 protrudes toward the light source rather than the broken line connecting the outer periphery of the concave surface portion 4b1 and the outer periphery of the ring-shaped convex surface portion 4b2.
Here, the ring-shaped convex surface portion 4b2 protrudes so as to approach the solid light source side from the outer periphery of the concave surface portion 4b1 to the outside, and has an inclined surface whose surface inclination approaches a direction perpendicular to the axis. Is formed.
Needless to say, the composite surface shape of the entrance surface 4b, the inclination of the exit surface 4a, and the like are optimized according to the characteristics of the video display device.

The divergent light beam emitted from the LED chip 2b arranged on the optical axis (same as the axis of rotation symmetry of the lens) emits the main light beam 20b0 along the optical axis, and the concave surface portion 4b1 of the incident surface 4b or a ring shape. A light ray incident on the convex surface portion 4b2 but incident on the concave surface portion 4b1 (shown by a solid line in FIG. 3A) is subjected to the lens action of the concave surface portion 4b1 and the emission surface 4a, and is more divergent than when emitted from the LED chip 2b. The light is emitted from the lens 400 around the optical axis as a divergent light beam 20b having a narrowed angle (a light beam having a spread including light beams indicated by upper and lower reference numerals 20b1 and 20b2 with the principal ray indicated by reference numeral 20b0 as the center). Among the light rays of the LED chip 2b, a light ray (not shown) that is emitted from the LED chip 2b and incident on the ring-shaped convex surface portion 4b2 of the lens 400 has a small lens action on the optical surface composed of the incidence surface 4b and the emission surface 4a. Since the light beam is greatly diverging from the optical axis and does not fall within the assumed viewing angle of the video display device, it will not be described here.

The divergent light beam emitted from the LED chip 2a disposed at a predetermined pitch from the optical axis is similarly incident on the concave surface portion 4b1 or the ring-shaped convex surface portion 4b2 of the incident surface 4b. FIG.
(A) shows a ray trajectory of the LED chip 2a by a broken line. Here, the radius of the concave portion 4b1 of the incident surface 4b is smaller than the LED chip interval 2a-2b (2b-2c).

  Here, the light beam incident on the ring-shaped convex surface portion 4b2 of the incident surface 4b includes the principal light beam 20a0 having the highest light intensity (the light beam emitted in parallel to the optical axis from the LED chip 2a). Since the ring-shaped convex surface portion 4b2 of the incident surface 4b is an inclined surface in a direction approaching the LED from the outer periphery to the outer side of the concave surface portion 4b1, the incident light surface 20a0 of the divergent light beam emitted from the LED chip 2a passes through the incident surface. An angle of the surface of the ring-shaped convex surface portion 4b2 and the exit surface 4a is close, and the principal ray 20a0 of the divergent light beam emitted from the LED chip 2a is not substantially changed in direction, and the exit surface 4a is an angle close to the optical axis. I will emit light. Further, the ring-shaped convex surface portion 4b2 of the incident surface 4b becomes smaller in inclination toward the outside of the lens starting from the outer periphery of the concave surface portion 4b1, and becomes perpendicular to the optical axis. The light 20a2 that diverges and exits in the direction of travels with a smaller divergence angle than when the LED chip exits.

Among the light beams of the LED chip 2a which is one light emitting element, the light beam incident on the concave surface portion 4b1 of the incident surface 4b is incident eccentrically with respect to the concave surface, as indicated by reference numeral 20a1 in FIG. Primarily refracts and emits light so that the angle of divergence of the emitted light is reduced.
The divergent light emitted from the LED chip 2c behaves in the same manner as the divergent light emitted from the LED chip 2a.

  Here, if the entrance surface of the lens 400 is formed as a concave portion over the entire surface and does not have a ring-shaped convex surface portion, the lens action is reduced, the spread of the light beam is increased, and high brightness cannot be achieved. The problem arises. In the present application, the chief ray is emitted perpendicularly to the substrate by the ring-shaped convex surface portion 4b2 provided on the incident surface, and the luminous flux is small in spread and high brightness can be achieved.

As described above, the light distribution characteristics of the 3 in 1 LED light-emitting element 2 that has passed through the lens 400 are shown in FIG. For comparison, FIG. 7 shows the light distribution characteristics when the lens 400 is not provided, and FIG. 8 shows the light distribution characteristics when the plano-convex lens 900 shown in FIG. 5 is provided. As described above, according to the first embodiment of the present invention, the provision of the lens 400 makes it possible to increase the front luminance by narrowing the divergence angle by the lens action as compared with the case where the lens is not provided. A device can be obtained. Further, even in comparison with an example provided with a plano-convex lens 900 that increases the front luminance, 3 in 1
It is possible to suppress an optical axis shift of the chief rays generated after the three divergent light beams emitted from the LED light emitting element 2 pass through the lens 400, and to obtain an image display device with a uniform color distribution characteristic of three colors and a small color shift.

Note that the divergent light beam emitted from the LED chip 2b described above and incident on the ring-shaped convex surface portion 4b2 of the incident surface 4b and the light beam that does not take the optical path described above do not fall within the viewing angle. Although not contributing to the above, the luminance within the viewing angle required when the lens 400 of the present application was provided could be increased.
The exit surface 4a of the lens 400 may be a spherical surface, but is preferably an aspherical surface. The ring-shaped convex surface portion 4b2 of the incident surface 4b may be a convex shape on the light source side when the cross-sectional shape passing through the rotational symmetry axis is viewed, or may be a cross-sectional shape composed of a combination of polygon lines, curves and straight lines. The lens acting surface portion is preferably a smooth curved surface, but may be constituted by a continuous body of a large number of planes.
Further, in the above example, the lens 400 is one lens working surface portion corresponding to one solid-state light source, and the matrix lens 4 in which the lenses 400 are arranged in a matrix is integrally formed. It is also possible to create 400 and a frame portion positioned between the lenses as separate bodies, and fit the lens 400 into a hole portion of the frame portion and integrate them.

In the first embodiment, the case where the 3 in 1 LED light emitting element 2 is used as the solid light source has been described. However, in the case where the 2 in 1 LED light emitting element is used, reference numeral 2 shown in FIG.
The positional relationship between the lens 400 and the 2 in 1 LED may be adjusted so that any two of the three LED chips (light emitting elements) indicated by a, 2b, and 2c are light emitting points.

  In the first embodiment, a 3-in-1 LED light emitting element 2 on which LED chips (2a, 2b, 2c) of three primary colors R (red), G (green), and B (blue) are mounted is taken as an example. However, the present invention is not limited to this, and a nin1 LED light emitting element (n: an integer of 2 or more) may be adopted. For example, the three primary colors R (red), G (green), and B (blue) The same effect can be obtained even if multi-color LED chips such as C (cyan), Y (yellow), and W (white) are added to. Further, even in the case of light emitting elements of the same color, the front luminance can be improved.

In the first embodiment, the surface-mount type LED light emitting element has been described as an example. However, the present invention is not limited to this, and the same effect can be obtained even when a DIP type LED light emitting element is employed.
Further, in the first embodiment, the display unit 1 in which a total of 16 3 in 1 LED light emitting elements 2 which are solid light sources are arranged in 4 × 4 in total is described with reference to FIGS. 1 and 2. However, the present invention is not limited to this, and the same effect can be obtained even if an arbitrary number of solid light sources are arranged in both the vertical and horizontal directions.

  In the above-described example, as the louver 5, the recumbent formed so as to protrude forward in the horizontal direction on the upper side of the solid-state light source is shown for each row, but in addition to this recumbent or A vertical gutter may be provided instead of the horizontal gutter. The vertical louvers of the louvers 5 are, for example, arranged in each row so as to extend in the vertical direction on the left and right of the rows of solid light sources arranged in the vertical direction, thereby blocking external light from the horizontal direction, thereby displaying the video display device. Display characteristics can be improved. Moreover, according to the installation condition, a flat member without a horizontal gutter and a vertical gutter can be arranged as the louver 5.

Embodiment 2.
In the second embodiment, a case where an n in 1 LED light-emitting element having four or more LED chips is used as one solid-state light source using the lens 400 shown in the first embodiment will be described first.
In addition to the three primary colors R, G, and B, a high image quality that improves color reproducibility and brightness by using multicolored light sources such as C (cyan), Y (yellow), and W (white). Video display devices are expected.
FIG. 9 shows an LED chip array of the 5 in 1 LED light-emitting element 21 that effectively functions the lens 400 and the lens 400 according to Embodiment 2 of the present invention. As shown in the figure, the LED chips are arranged on the circumference of a virtual pitch circle having the radius between the LED chips 2a-2b or 2b-2c of the 3 in 1 LED light emitting element 2 shown in the first embodiment. If 2a, 2d, 2c, and 2e are arranged at equal intervals of 90 degrees (90 degree intervals), a total of five LED chips are arranged together with the LED chips 2b arranged on the optical axis. 21 is obtained. Here, the radius of the pitch circle is larger than the radius of the concave surface portion 4b1 of the incident surface 4b, and the LED chips 2a, 2d, 2c, and 2e are opposed to the ring-shaped convex surface portion 4b2 of the incident surface 4b . The divergent light beam emitted from each LED chip follows the same locus as described in the first embodiment, and the light distribution characteristic of the light emitted from each LED chip and passing through the lens 400 is the same even when the number of LED chips increases. As a result, it is possible to obtain a video display device with good image quality.

In addition, when two LED chips are arranged one by one at regular intervals at an interval of 180 degrees on the circumference of the pitch circle, three LED chips are arranged in a row together with one LED chip on the axis. The chip arrangement of the 3-in-1 LED of Embodiment 1 is obtained. It goes without saying that the interval between the LED chips arranged on the circumference of the pitch circle can be changed according to the number of LEDs, and if arranged at an equal interval of 120 degrees, it is arranged on the circumference of the pitch circle. A 4-in-1 LED chip arrangement can be obtained with one LED chip and one LED chip on the optical axis. In this way, n in 1 L
An ED light-emitting element can be obtained by arranging one LED chip on the optical axis and further arranging n-1 LED chips at equal intervals on the circumference of the pitch circle.
In addition, LED chips are not arranged on the optical axis, and n in 1 LED light emitting elements in which n (n is an integer of 2 or more) LED chips (light emitting elements) are arranged at equal intervals on the circumference of the pitch circle. Even in the same manner, the above-described effects can be obtained.

Embodiment 3 FIG.
Next, a video display apparatus according to Embodiment 3 of the present application will be described with reference to FIG. In Embodiment 1 described above, the matrix lens 4 is shown to be a transparent resin. However, the display unit 1 in Embodiment 3 uses a black pigment for the transparent resin material forming the matrix lens 4. It is mixed to give a black smoke color.
The light transmittance of the matrix lens 4 can be adjusted by adjusting the mixing ratio of the transparent resin material and the black pigment. If the light transmittance is set small, the contrast of the video display device can be increased, but the luminance is lowered. On the other hand, when the light transmittance is set large, the contrast of the video display device is lowered, but the luminance is increased. Depending on the luminance ability and specifications of the LED light emitting element, the light transmittance can be freely set using this method. In addition, light transmittance shall be adjusted in 30 to 90% of range.

Next, operations and effects of the display unit 1 according to the third embodiment will be described. By setting the matrix lens 4 of the first embodiment to a black smoke color, there is an effect of lowering the dark luminance during black display (when not lit), and the contrast can be improved.
In addition, the brightness, viewing angle, and contrast can be arbitrarily adjusted by adjusting the light transmittance of the black smoke resin material and the lens shape for each specification of the installation environment of the video display device and the viewing angle of the observer. Is possible. For example, by designing a lens with a lens gain of 3 times and combining a black smoke material with a transmittance of 0.5, the front luminance of 3 × 0.5 = 1.5 times and a contrast of 1 /0.5=2 times.

Embodiment 4.
In addition to the configuration of the display unit 1 of the first embodiment described above, the display unit 1 in the fourth embodiment shown in FIG. 11 is further subjected to black smoke coating or black smoke coating on the surface on the emission surface 4a side of the matrix lens 4. A light transmittance adjusting film 4c that covers the surface of the lens 400 and adjusts the light transmittance to 30 to 90% is provided.
It is possible to adjust the light transmittance of the light transmittance adjusting film 4c by adjusting the mixing ratio of the black pigment contained in the black smoke paint or the black smoke coating material.
It is also possible to adjust the light transmittance by adjusting the film thickness of the light transmittance adjusting film 4c. Further, the same effect can be obtained even if painting or coating is applied to the back surface of the matrix lens 4.

1,100 Display unit 2 3 in 1 LED light emitting element (solid light source)
2a, 2b, 2c, 2d, 2e, 7a, 7b, 7c LED chip (light emitting element)
3 Wiring board (board)
4, 9 Matrix lens 4a, 9a Output surface (output surface part)
4b, 9b Incident surface (incident surface part)
4b1 Concave part 4b2 Ring-shaped convex part 4c Light transmittance adjustment film 5 Louver 6 Housing case 7 1 in 1 LED light emitting element (solid light source)
8 picture element 20a0, 20a1, 20a2, 20b0, 20b1, 20b2 Ray locus 21 5 in 1 LED light emitting element (solid light source).

Claims (13)

A solid-state light source in which a plurality of light-emitting elements are mounted in one package, a substrate on which the plurality of solid-state light sources are mounted in a matrix, the substrate is opposed to the light-emitting surface portion of the solid-state light source, One lens action surface portion is provided corresponding to one solid light source, and a plurality of lens action surface portions are arranged in a matrix, and the lens action surface portion of the matrix lens includes the light emitting element. An incident surface portion where a light beam emitted from the light beam enters parallel to a predetermined axis and an output surface portion where the light beam exits are formed rotationally symmetric about the axis, and the incident surface portion is a concave surface portion centered on the axis. If, has a ring-shaped convex portion formed toward the outside from the outer circumference of the concave portion, the exit surface portions have a convex portion around the said axis, in the one of said package The plurality of light emitting elements to be mounted are spaced apart from each other on one circumference centered on the axis serving as the center of the lens working surface portion, and the circumference is the ring-shaped convex surface of the incident surface portion. A video display device characterized by facing the part .   The ring-shaped convex surface portion formed on the incident surface portion of the lens acting surface portion protrudes toward the solid light source side from the outer periphery of the concave surface portion toward the outside, and the surface inclination is relative to the axis. The video display device according to claim 1, wherein the video display device is formed so as to approach a vertical direction.   A plurality of the light emitting elements mounted in one package are arranged on the axis that is the center of the lens action surface portion and on one circumference around the axis, and are arranged on the circumference. The video display device according to claim 1, wherein the light emitting element is opposed to the ring-shaped convex surface portion of the incident surface portion. The radius of the concave surface portion around the said axis of the incident surface of the lens action surface portion, claim 1, characterized in that it is formed to have a radius smaller than the circumference of the light-emitting elements are arranged image display apparatus according to any one claim of 3. The light emitting element is in one of the package, the image display apparatus according to any one claim of 4 claim 1, characterized in that disposed one by one at intervals of 180 degrees on the circumference. The light emitting element is in one of the package, the image display apparatus according to any one claim of 4 claim 1, characterized in that disposed one by one at 120 degree intervals on the circumference. The light emitting element is in one of the package, the image display apparatus according to any one claim of 4 claim 1, characterized in that disposed one by one at 90 ° intervals on the circumference. The light emitting device is a video display apparatus according to any one claim from claim 1, wherein 7 to be a light emitting diode. The color of the light emitting element mounted on one of the packages, red, green, image display apparatus of any one of claims 1, characterized in that the three primary colors of blue 8. In front of the matrix lens, the image display apparatus of any one of claims 1 to black louver for blocking external light, characterized in that disposed 9. The matrix lens is fabricated of a material mixed with black pigment, the image display apparatus of any one of claims 1 to 10, light transmittance is characterized in that it is adjusted to 30% to 90%. The matrix lens, light transmittance adjusting film is provided on the surface, the image display apparatus of any one of claims 1 to 10, light transmittance is characterized in that it is adjusted to 30% to 90%. A solid-state light source in which a plurality of light-emitting elements are mounted in a single package; and a lens action surface portion disposed adjacent to and in close proximity to the light emission surface portion of the solid-state light source, wherein the lens action surface portion is emitted from the light-emitting element. An incident surface portion on which the incident light beam is incident parallel to a predetermined axis and an output surface portion on which the light beam is emitted are formed rotationally symmetrically about the axis, and the incident surface portion is a concave surface portion centered on the axis; has a ring-shaped convex portion formed toward the outside from the outer circumference of the concave portion, the exit surface portions have a convex portion around the said axis, a plurality of the light emitting element mounted in one of said package The lens acting surface portion is disposed on one circumference centered on the axis that is the center of the lens acting surface portion, and the circumference is opposed to the ring-shaped convex surface portion of the incident surface portion. Toss The video display device.

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