JP6171625B2 - Display unit and display device - Google Patents

Description

  The present invention relates to an image display device that is installed outdoors and displays images or characters on a large screen by light emission of a large number of light emitting elements such as light emitting diodes (hereinafter referred to as LEDs).

  In general, an image display apparatus is configured by arranging a large number of display units having a plurality of light emitting elements on a plane. In recent years, LEDs have come to be used as light emitting elements. The LED has an advantage that the arrangement and arrangement pitch can be arbitrarily designed. From this, video display devices having various resolutions and luminances can be configured according to applications. The display unit of the video display device includes a large number of single-color, two-color, or light three-primary surface-mount LEDs. In many cases, conventional display devices use an LED in which an LED and a lens are integrated as a light source. Also, a dustproof or rainproof flat plate is disposed on the front surface of the LED substrate. The three primary colors of light are red (R), green (G), and blue (B). A large display device has a large number of display units arranged vertically and horizontally. Each display unit is controlled by an external control device.

  Patent Document 1 discloses an LED display device in which a transparent polycarbonate plate having a thickness of 0.5 mm is arranged on the light emission side of LEDs arranged on an LED array plate.

JP2011-40570 (FIG. 1A)

  However, when the above-described LED display device is used outdoors exposed to sunlight, sunlight enters the polycarbonate plate. In this case, sunlight propagates through the polycarbonate plate and stray light is generated. This stray light causes problems such as local screen glare, luminance unevenness, bright and dark lines, and the like. A “bright / dark line” is a line of light that appears to shine white as a line when stray light is concentrated and emitted from pixels in the same column or row. Alternatively, the stray light emitted from the pixel at the end of the display unit is a black line in which the shadow of the groove formed in the coupling portion between the display unit and the display unit is conspicuous by reducing the peripheral contrast.

  The display device according to the present invention suppresses stray light propagating through a cover member such as a transparent integrated lens array or a protective cover disposed on the front surface of the light emitting element, and causes local glare, luminance unevenness, or brightness / darkness. The purpose is to suppress lines and the like.

In order to achieve the above object, a display unit according to the present invention includes a plurality of light sources arranged two-dimensionally on a substrate, and a light emitting unit of the light source. The display unit emits light emitted from the light source. and a cover that transmits, the cover is a on the substrate surface opposite to the said cover, on the surface located between two of the light sources adjacent, have a first concavo-convex structure, the first The uneven structure of 1 is a surface including a straight line connecting the centers of the adjacent light sources, and a shape cut by a surface perpendicular to the substrate has a shape in which triangular shapes are arranged. A shape that is a right angle and includes a straight line parallel to the substrate and that is cut by a surface perpendicular to the substrate is a linear shape.

  Propagation of external light that has entered the inside of the cover member is suppressed, and deterioration in display quality due to stray light is suppressed.

It is the decomposition | disassembly map and sectional drawing of the display unit provided with the uneven structure for preventing the stray light of Embodiment 1 of this invention from propagating. It is the decomposition | disassembly figure and sectional drawing of the display unit provided with the uneven | corrugated structure for preventing the stray light of Embodiment 2 of this invention from propagating. It is the decomposition | disassembly map and sectional drawing of a display unit provided with the uneven structure for preventing the stray light of Embodiment 3 of this invention from propagating. It is the exploded view and sectional drawing of the display unit provided with the uneven structure for preventing the stray light of Embodiment 4 of the present invention from propagating. It is a block diagram of the display apparatus which arranged the display unit of this invention. FIG. 6 is an oblique projection and a cross-sectional view of a display unit in which a light emitting element of a display device and a dustproof or rainproof cover are integrated. It is the perspective view and sectional drawing of a display unit using the lens array with which the light emitting element and lens of the display apparatus were united. It is a disassembled perspective view and sectional drawing of the conventional display unit required for description of the problem which a display apparatus has.

  FIG. 6 is a schematic view of the display unit 10 provided with a dustproof or rainproof cover 5. FIG. 6A is a perspective view of the display unit 10 as viewed from the front. FIG. 6B is a configuration diagram showing a cross-sectional configuration of the display unit 10. In the following embodiment, the light source which comprises the pixel of the display unit 10 is demonstrated as LED. This is because an LED is generally used as a light source at present, and the light source is not limited to the LED.

  LED1 is attached to the board | substrate 2 so that electricity supply is possible. Power is supplied to the LED 1 through the substrate 2. As the LED 1, a 1 in 1 type, a 2 in 1 type, or a 3 in 1 type is used depending on the application. “1 in 1 type” is one in which one light emitting element is mounted in one LED 1. The “2 in 1 type” is one in which two light emitting elements are mounted in one LED 1. The “3 in 1 type” is one in which three light emitting elements are mounted in one LED 1.

  A dustproof or rainproof cover 5 is disposed on the front side of the light emitting element 1. An air layer 4 is provided between the light emitting element 1 and the cover 5. The air layer 4 is provided to absorb the mounting variation of the LED 1 mounted on the substrate 2 and the positional variation of the convex structure portion 51 of the cover 5. The cover 5 is fixed to the substrate 2. Further, the cover 5 has a convex structure portion 51 formed on the front surface portion of the light emitting element 1 so as to protrude toward the front surface side of the light emitting element. In the cover 5 of FIG. 6, a portion through which light from the light emitting element 1 transmits is formed in a plane.

  FIG. 7 is a schematic view of a display unit 10 using the lens array 3 instead of the flat plate-like cover 5. FIG. 7A is a perspective view of the display unit 10 as viewed from the front. FIG. 7B is a configuration diagram showing a cross-sectional configuration of the display unit 10. In the lens array 3, one lens 31 is formed on the front surface of the LED 1. One pixel is formed by a combination of one LED 1 and a lens 31 disposed in front of the LED 1.

FIG. 8 is a diagram for explaining generation of stray light in the configuration of the display unit 10 shown in FIG. FIG. 8A is a perspective view illustrating a schematic configuration of the display unit 10. FIG. 8B is a partial view showing a schematic configuration of a cross section of the display unit 10. In the display unit 10, surface-mounted LEDs 1 are mounted on a substrate 2 in a matrix. The “matrix” has “row” and “column” which are two orthogonal directions on a plane. In other words, the "mounted on a matrix" refers to mount components in a rectangular shape along the the "row" and "column". Here, the LED 1 is two-dimensionally arranged on the surface of the substrate 2. The LEDs 1 are arranged in close proximity to form pixels. “Proximity” means being near, and need not be in contact.

  On the front side of the LED 1, a cover 5 for dustproof or rainproof purposes is disposed. The cover 5 is disposed so as to cover the LED 1. The cover 5 is made of a transparent material so as to transmit light emitted from the LED 1. A gap is formed between the LED 1 and the cover 5, and an air layer 4 exists. A convex structure 51 is formed on the cover 5 so as to cover the LEDs 1 one by one. Further, as the thickness of the cover 5 increases, the material cost increases and the weight of the display unit 10 also increases. Therefore, the thickness of the cover 5 is generally about 1 mm to 3 mm.

  FIG. 8B schematically shows how the external light 9 that has entered the cover 5 propagates inside the cover 5 when the display unit 10 is installed outdoors. The external light 9 incident on the cover 5 from the front surface of one LED 1 is reflected by the surface of the cover 5 facing the substrate 2 between the two LEDs 1 and is emitted to the outside from the front surface of the adjacent LED 1. After the light propagates through the inside of the cover 5, the outside light 9 emitted to the outside is light that is not related to the displayed image and is called stray light. “Stray light” refers to undesirable light caused by causes other than regular reflection and refraction in an optical instrument. Such propagation of the outside light 9 inside the cover 5 can also occur in pixels adjacent in the vertical direction or pixels adjacent in the horizontal direction.

  The stray light propagating through the inside of the cover 5 is reflected and generated on the surface of the cover 5 between the adjacent LEDs 1. That is, this stray light is easily generated by the presence of the flat surface of the cover 5 facing the substrate 2. Hereinafter, the flat surface of the cover 5 facing the substrate 2 on the surface of the cover 5 between the adjacent LEDs 1 is referred to as “opposing surface 6”. External light 9 that has entered the interior of the front surface of the cover 5 of a certain pixel is refracted by the air layer 4 and travels. The external light 9 whose traveling direction has been changed by refraction is reflected by the facing surface 6. The reflected external light 9 is refracted by the air layer 4 of the adjacent pixel and is emitted to the outside from the surface of the cover 5 in front of the adjacent pixel. Due to this stray light, the overall luminance value of the display surface of the display unit 10 is increased. As a result, the contrast of the display unit 10 is lowered. Further, uneven brightness occurs in the display unit 10. In addition, bright and dark lines are generated in the display unit 10.

  It is also conceivable that light incident on the portion of the facing surface 6 has a shallow incident angle and is not reflected by the facing surface 6. However, the amount of these lights is extremely smaller than the amount of light reflected by the facing surface 6. The “incident angle” is an angle between a line representing the traveling direction of light and a normal line standing on the reflecting surface. “The incident angle is shallow” means that the incident angle is large.

Embodiment 1 FIG.

  Embodiment 1 of the present invention will be described below. FIG. 1 is a schematic diagram of a display unit 11 according to the first embodiment. FIG. 1A is a perspective view showing a schematic configuration of the display unit 11 according to Embodiment 1 from the front. FIG. 1B is a partial view showing a schematic configuration of a cross section of the display unit 11 according to the first embodiment. The display unit 11 is different from the display unit 10 in that it has an uneven structure 61 on the facing surface 6. In FIG. 1, the concavo-convex structure 61 is shown partially enlarged. The same components as those of the display unit 10 are denoted by the same reference numerals, and the description thereof is omitted. The same components as those of the display unit 10 are the LED 1 and the substrate 2.

  As shown in FIG. 1B, the shape of the concavo-convex structure 61 which is a plane including a straight line connecting the centers of adjacent LEDs 1 and cut perpendicular to the substrate 2 is a shape in which triangles are arranged. ing. The triangle here is an isosceles triangle. That is, the two inclined surfaces s of the concavo-convex structure 61 have an equal inclination angle a with respect to the surface of the opposing substrate 2. On the other hand, the shape of the concavo-convex structure 61 which is a plane including a straight line perpendicular to the straight line connecting the centers of the adjacent LEDs 1 and parallel to the substrate 2 and cut perpendicular to the substrate 2 is a linear shape. . The “shape in which triangles are arranged” is a sawtooth shape.

  First, when solar light is irradiated to the display unit 11 installed outdoors, part of the solar light (external light 9) enters from the convex structure portion 51 of the cover 5. The convex structure portion 51 is formed on the front side of the LED 1. The outside light 9 is refracted by the air layer 4 and changes its traveling direction. Then, the external light 9 whose traveling direction has been changed is reflected by the facing surface 6. At this time, in the display unit 11, the external light 9 strikes the portion of the concavo-convex structure 61 formed on the facing surface 6. The external light 9 is reflected by the slope of the concavo-convex structure 61. That is, the traveling direction of the external light 9 changes to the direction in which the external light 9 has traveled. For this reason, the external light 9 does not reach the position of the adjacent pixel.

  The external light 9 reflected by the concavo-convex structure 61 is scattered, and while being reflected or transmitted repeatedly inside the cover 5, the luminance when emitted from the cover 5 is attenuated. In other words, the stray light 5 that attempts to propagate to the position of the adjacent pixel is suppressed, and the amount of unintended light emission from the pixel position can be suppressed.

  Even in the case of the lens array 3 having the lens 31 as shown in FIG. 7, the cover 5 on the front surface of the LED 1 is not flat, and the uneven structure 61 can reduce the influence of stray light.

Further, the uneven structure 61 may be provided on the surface on the substrate 2 facing the facing surface 6 without being formed on the facing surface 6 of the cover 5. In this case, if there is a gap between the facing surface 6 and the concavo-convex structure on the substrate 2, the external light 9 is reflected by the facing surface 6, and the effect of the concavo-convex structure on the substrate 2 is not sufficiently exhibited. . On the other hand, when an adhesive that transmits light is filled between the opposing surface 6 and the concavo-convex structure on the substrate 2, the same effect as when the concavo-convex structure 61 is formed on the opposing surface 6 can be obtained. This difference in refractive index between the cover 5 an adhesive is smaller than the difference in refractive index between the cover 5 and the air layer 4, because the light is not totally reflected at the opposing surface 6. If there is an air layer 4 between the cover 5 and the substrate 2, much of the outside light 9 is totally reflected on the surface of the cover 5. That is, it can be understood that the special effect of the display unit 11 cannot be obtained by simply forming the concave-convex structure on the substrate 2 and simply attaching the cover 5.

  The display unit 11 includes a plurality of LEDs 1 that are two-dimensionally arranged on the substrate 2 and a cover 5 that is disposed to face the light emitting portion of the LED 1 and transmits light emitted from the LEDs 1. On the surface of the cover 5 facing the substrate 2 and between the two adjacent LEDs 1 (opposite surface 6), an uneven structure 61 is provided. Here, LED1 is a light source.

  The concavo-convex structure 61 is a plane including a straight line connecting the centers of adjacent LEDs 1, and a shape cut by a plane perpendicular to the substrate 2 has a shape in which triangular shapes are arranged, and the center of the adjacent LEDs 1. Is a plane including a straight line perpendicular to the straight line connecting the two and parallel to the substrate 2, and the shape cut by a plane perpendicular to the substrate 2 forms a linear shape.

<Modification 1>
The uneven structure 62 shown in Modification 1 has a different shape from the uneven structure 61. The concavo-convex structure 61 had an isosceles triangular cross section. That is, the two inclined surfaces of the concavo-convex structure 61 have the same inclination angle a with respect to the surface of the opposing substrate 2. The concavo-convex structure 62 has a triangular shape in which two sides have different lengths. That is, the inclination angles of the two slopes are different angles.

  FIG. 2 is a schematic diagram of the display unit 11 according to the first modification. FIG. 2A is a perspective view showing a schematic configuration of the display unit 11 according to Modification 1 from the front. FIG. 2B is a partial view showing a schematic configuration of a cross section of the display unit 11 according to the first modification. In FIG. 2, the concavo-convex structure 62 is shown partially enlarged.

  The concavo-convex structure 62 is characterized by being specialized in the reflection of the external light 9 from a specific angle. Specifically, the inclination angle a1 of the upper slope s1 in the direction of incidence of solar light is reduced, and the inclination angle a2 of the lower slope s2 on the ground side is increased. The upper slope s1 is long and the lower slope s2 is short. That is, the cross-sectional triangle has a long upper side and a short lower side. The upper slope s1 is formed so as to be perpendicular to the external light 9 incident from the portion between the positions of adjacent pixels. For this reason, the external light 9 incident from the portion between the positions of adjacent pixels is reflected in the incident direction, and thus does not propagate inside the cover 5.

  Further, the external light 9 incident from the position of the upper pixel may be propagated through the cover 5 after being reflected when the inclination angle a1 is large, but in the case of the concavo-convex structure 62, the cover 5 The possibility of being emitted to the outside increases. As described above, the concavo-convex structure 62 promptly emits the external light 9 incident on the inside of the cover 5 to the outside. For this reason, the stray light which propagates the inside of the cover 5 can be reduced. In order to obtain the above-described effect, the uneven structure 62 is provided between the LEDs 1 arranged in the vertical direction. Here, the “vertical direction”, when installed outdoors, is a vertical direction in which the sun direction is up and the ground direction is down. When installed indoors, the direction of the illuminated light source is optically upward.

  Similarly to the concavo-convex structure 61, the concavo-convex structure 62 can be provided on the surface on the substrate 2 facing the facing surface 6 without being formed on the facing surface 6 of the cover 5. In this case, if there is a gap between the facing surface 6 and the concavo-convex structure on the substrate 2, the external light 9 is reflected by the facing surface 6, and the effect of the concavo-convex structure on the substrate 2 is not sufficiently exhibited. . On the other hand, when an adhesive that transmits light is filled between the opposing surface 6 and the concavo-convex structure on the substrate 2, the same effect as when the concavo-convex structure 61 is formed on the opposing surface 6 can be obtained. That is, it can be understood that the special effect of the display unit 11 cannot be obtained by simply forming the concave-convex structure on the substrate 2 and simply attaching the cover 5.

  In the display unit 11, of the two inclined surfaces s1 and s2 forming the concavo-convex structure 62, the inclination angle a1 with respect to the substrate 2 of the inclined surface s1 in the direction in which the strongest external light enters is inclined with respect to the substrate 2 of the other inclined surface s2. It is smaller than the angle a2.

<Modification 2>
The concavo-convex structure 63 shown in Modification 2 has a different shape from the concavo-convex structures 61 and 62. The two inclined surfaces s of the concavo-convex structure 61 had the same inclination angle a with respect to the surface of the opposing substrate 2. Further, in the concavo-convex structure 62, the inclination angle a1 of the upper slope s1 in the direction in which the sunlight is incident is small, and the inclination angle a2 of the lower slope s2 on the ground side is large. The uneven structure 63 has a symmetrical shape with respect to the center of the position of the two pixels.

  FIG. 3 is a schematic view of a display unit 11 according to the second modification. FIG. 3A is a perspective view showing a schematic configuration of the display unit 11 according to Modification 2 from the front. FIG. 3B is a partial view illustrating a schematic configuration of a cross section of the display unit 11 according to the second modification. In FIG. 3, the uneven structure 63 is shown partially enlarged.

  The upper half concavo-convex structure 63 between the two LEDs 1 arranged in the vertical direction has the same shape as that of the second modification. That is, the upper half concavo-convex structure 63 has a small inclination angle a1 of the upper slope s1 in the direction of incidence of solar light and a large inclination angle a2 of the lower slope s2 on the ground side. On the other hand, the lower half concavo-convex structure 63 has a shape symmetrical to the upper half concavo-convex structure 63 with respect to a plane passing through the center point between the two LEDs 1 arranged in the vertical direction and parallel to the horizontal plane. doing. That is, in the lower half concavo-convex structure 63, the inclination angle a3 of the upper slope s3 in the direction of incidence of solar light is large, and the inclination angle a4 of the lower slope s4 on the ground side is small.

  The concavo-convex structure 63 allows the external light 9 incident from the upper pixel position to be emitted to the outside of the cover 5, and allows the external light 9 incident from the lower pixel position to be emitted to the outside of the cover 5. it can. As described above, the concavo-convex structure 63 is effective against stray light incident from the pixel position and propagating through the inside of the cover 5.

  For this reason, even if the uneven structure 63 is formed not only between adjacent pixel positions in the vertical direction but also between horizontal (left and right) pixel positions, an effect of reducing stray light is obtained. In other words, the concavo-convex structure 63 is formed so as to be vertically symmetric between pixel positions adjacent in the vertical direction, so that stray light from either adjacent pixel is reflected equally, and propagation to other pixels is reduced. be able to. Further, the concavo-convex structure 63 is formed so as to be bilaterally symmetric between pixel positions adjacent in the horizontal direction, so that stray light from any of the adjacent pixels is equally reflected, and propagation to other pixels is reduced. be able to.

  The uneven structure 63 is formed between adjacent pixel positions. Of the two opposing inclination angles of the concavo-convex structure 63, the inclination angle of the slope facing the pixel position close to the position of the concavo-convex structure 63 is small. Of the two opposing tilt angles of the concavo-convex structure 63, the slope angle of the slope facing the pixel position far from the position of the concavo-convex structure 63 is large.

  That is, in the display unit 11, of the two inclined surfaces s forming the uneven structure 63, the inclination angle a of the inclined surface s near the light source from the position of the uneven structure 63 is smaller than the inclination angle a of the other inclined surface s with respect to the substrate. .

  Similar to the concavo-convex structure 61, the concavo-convex structure 63 can be provided on the surface on the substrate 2 facing the facing surface 6 without being formed on the facing surface 6 of the cover 5. In this case, if there is a gap between the facing surface 6 and the concavo-convex structure on the substrate 2, the external light 9 is reflected by the facing surface 6, and the effect of the concavo-convex structure on the substrate 2 is not sufficiently exhibited. . On the other hand, when an adhesive that transmits light is filled between the opposing surface 6 and the concavo-convex structure on the substrate 2, the same effect as when the concavo-convex structure 61 is formed on the opposing surface 6 can be obtained. That is, it can be understood that the special effect of the display unit 11 cannot be obtained by simply forming the concave-convex structure on the substrate 2 and simply attaching the cover 5.

<Modification 3>
The uneven structure 61, 62, 63 described above is provided only on the facing surface 6 that faces the substrate 2 of the cover 5. However, the concavo-convex structure 64 according to the modification 3 is also provided on the surface facing the facing surface 6 of the cover 5.

  FIG. 4 is a schematic diagram of the display unit 11 according to the third modification. FIG. 4A is a perspective view showing a schematic configuration of the display unit 11 according to Modification 3 from the front. FIG. 4B is a partial view illustrating a schematic configuration of a cross section of the display unit 11 according to the third modification. In FIG. 4, the concavo-convex structure 64 is shown partially enlarged.

  In FIG. 4, the shape of the concavo-convex structure 64 is the same as the shape of the concavo-convex structure 61. However, the shape of the uneven structure 64 may be the same as the shape of the other uneven structures 62 and 63.

  By providing the concave-convex structure on the surface 7 facing the facing surface 6 of the cover 5, the number of reflections of stray light propagating inside the cover 5 can be increased, and the amount of light reaching other pixel positions can be reduced. . Further, by increasing the degree of stray light scattering, the brightness of light emitted from the cover 5 can be lowered.

  Similarly to the concavo-convex structure 61, the concavo-convex structure 64 can be provided on the surface on the substrate 2 facing the facing surface 6 without being formed on the facing surface 6 of the cover 5. In this case, if there is a gap between the facing surface 6 and the concavo-convex structure on the substrate 2, the external light 9 is reflected by the facing surface 6, and the effect of the concavo-convex structure on the substrate 2 is not sufficiently exhibited. . On the other hand, when an adhesive that transmits light is filled between the opposing surface 6 and the concavo-convex structure on the substrate 2, the same effect as when the concavo-convex structure 64 is formed on the opposing surface 6 can be obtained. That is, it can be understood that the special effect of the display unit 11 cannot be obtained by simply forming the concave-convex structure on the substrate 2 and simply attaching the cover 5.

  The display unit 11 also has the concavo-convex structure 74 on the surface 7 of the cover 5 that faces the surface having the concavo-convex structure 64 (opposing surface 6).

  FIG. 5 is a configuration diagram of the display device 100 in which the display units 10 and 11 are arranged in a planar shape. By arranging the display units 10 and 11, the display device 100 having different screen sizes can be easily manufactured.

  In addition, although embodiment of this invention was described as mentioned above, this invention is not limited to these embodiment.

  DESCRIPTION OF SYMBOLS 1 LED, 2 Substrate, 3 Lens array, 31 Lens, 4 Air layer, 5 Cover, 51 Convex structure part, 6 Opposing surface, 61, 62, 63, 64, 74 Uneven structure, 7 surface, 9 Outside light, 10, 11, display unit, 100 display device, a, a1, a2, a3, a4 tilt angle, s, s1, s2, s3, s4 slope.

Claims (10)

A plurality of light sources arranged two-dimensionally on a substrate;
A cover arranged opposite to the light emitting part of the light source and transmitting light emitted from the light source,
The cover is a on the substrate surface opposite to the said cover, on the surface located between two of the light sources adjacent, have a first relief structure,
The first concavo-convex structure is a plane including a straight line connecting the centers of the adjacent light sources, and a shape cut by a plane perpendicular to the substrate has a shape in which triangular shapes are arranged, A display unit in which a shape perpendicular to the substrate and including a straight line parallel to the substrate and cut by a surface perpendicular to the substrate is a linear shape .   The display unit according to claim 1, wherein an air layer is provided between the substrate and the first uneven structure.   The display unit according to claim 1, wherein the cover has a convex structure formed so that a front portion of the light source protrudes. Of the two inclined surfaces forming the first relief structure, the inclination angle with respect to the substrate slopes strongest external light in a direction incident from the inclination angle is less than claim 1 to said substrate of the other inclined surface 3 The display unit according to any one of the above. Of the two inclined surfaces forming the first relief structure, the inclination angle of the inclined surface closer to the light source from the position of the first relief structure, 3 from the inclined angle smaller claim 1 to said substrate of the other slope The display unit according to any one of the above. Display unit according to any one of claims 1 to 5 having a second uneven structure on a surface of said cover opposite the surface having the first uneven structure. The second concavo-convex structure is a surface including a straight line connecting the centers of the adjacent light sources, and a shape cut by a surface perpendicular to the substrate has a shape in which triangular shapes are arranged, The display unit according to claim 6 , wherein a shape cut by a plane perpendicular to the substrate and including a straight line perpendicular to the straight line and parallel to the substrate is a linear shape. Of the two slopes forming the second uneven structure, the inclination angle with respect to the substrate of the slope in the direction of the strongest external light is incident, according to the inclination angle smaller claim 7 relative to the substrate of the other slope Display unit. The second of the two inclined surfaces forming a concave-convex structure, the inclination angle of the inclined surface closer to the light source from the position of the second relief structure, according to the inclination angle smaller claim 7 relative to the substrate of the other slope Display unit. Display device arranged to display unit according to any one of claims 1 to 9.

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