JP2000181363A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the display device which prevents a displayed image from becoming hard to view since the incidence light from an external light source is reflected by a display screen and then its reflected light reaches a viewer. SOLUTION: This display device has a shading part 5 and a reflection part 6 provided to its front cover 1. Then the direction wherein the incident light 7 is reflected by the reflection part 6 in an irregular shape is set outside a view range and the shading part shades the incident light 7 irradiating an LED (light emitting diode) 4 to eliminate or weaken reflected light reaching the view range, thereby making it easy to view an image displayed on a display device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device such as a large-sized image display device installed in various places such as a sports facility, an event facility, and a mural of a building, or a display unit constituting a display screen thereof.

[0002]

2. Description of the Related Art When incident light (for example, sunlight) from a light source outside a display device is irradiated on the display device, an image displayed on a display screen becomes difficult to see. This is the light emitted from the light-emitting unit composed of one or more light-emitting elements for recognizing the image displayed on the display screen, and the reflected light that is incident light from an external light source reflected on the display screen. Is synthesized, so that it becomes difficult for a viewer to recognize the brightness and color of the image.

For this purpose, the conventional display device has a light shielding portion for shielding incident light from being radiated on the display screen. Here, the display screen indicates a light-emitting body that emits light and its surroundings.

[0004] A conventional display device is shown below. FIG. 6 is a side sectional view of a conventional display device, and FIG. 7 is an exploded perspective view of the conventional display device. Here, the display device uses a light emitting diode (LED) as a light emitter. FIG. 6 shows a conventional display device.
As shown in FIG. 1, the front cover 12, the LED board 13, and the outer frame 14 are provided. The LED board 13 is provided with an LED 15 which is a light emitting body for displaying by light, and the brightness of the LED 15 is controlled by a display control device (not shown).

[0005] As shown in FIG. 6, the front cover 12 has a light-shielding portion 16, which can shield light from the external light source (for example, sunlight) around the LED 15 and the LED 15. Therefore, the light emitted from the LED 15 does not become difficult for a viewer to see. In particular, FIG. 6 shows a configuration in which a light-shielding portion 16 is disposed right above a light-emitting portion configured by using a plurality of LEDs 15 to block sunlight from above.

Therefore, in the conventional display device, the incident light from the external light source can be shielded by providing the light shielding portion, and the image displayed on the display device can be easily seen by a viewer.

[0007] When the picture element is large, an image which is easy for a viewer to see can be displayed on the display device by enlarging the light shielding portion 16.

[0008]

However, when the light-shielding portion is enlarged, the light emitted from the luminous body to the viewer is blocked, and the displayed image is missing or different from the expected color. May be.

In order to express black, the light emitter is turned off. At this time, it is important to reduce the reflected light from the display screen as much as possible in order to increase the contrast (difference between light and dark) and display an image which is easy to see. is there.

In order to solve the above-mentioned problems, the present invention suppresses externally incident light from being reflected on a display screen in the direction of a viewer and makes the displayed image invisible, and at the same time, shields light. It is an object of the present invention to provide an excellent display device capable of avoiding a lack of an image or a different color depending on a part.

[0011]

Therefore, in the present invention, a light-emitting body which performs display by irradiating light and a light which is located around the light-emitting body and emits light other than the light-emitting body from the light-emitting body are provided. And a reflecting portion that reflects weakly.

[0012] Further, the reflecting portion has a concave-convex shape for irregularly reflecting light other than the light-emitting material.

[0013] Further, the reflecting portion reflects light other than the light emitting body at an angle different from the light emitted from the light emitting body.

Further, it is assumed that the reflection section has a saw-like side cross section. Further, in addition to the reflection section, a light-shielding section that blocks light other than the light-emitting body is provided.

Therefore, the display device suppresses the external light from being reflected by the display device in the direction of the viewer so as not to make the display screen difficult to see, and also to prevent the light-shielding portion from making the display screen difficult to see. This makes it easier for the viewer to see the display screen.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A display device according to a first aspect of the present invention includes a luminous body that performs display by irradiating light, and a luminous body that is positioned around the luminous body and emits light other than the luminous body. The display device includes a reflection unit that reflects light weaker than light emitted from a body, and suppresses reflection of light other than light from the body to make the display screen easier to see.

According to a second aspect of the present invention, in the display device according to the first aspect, the reflecting portion has an uneven shape for irregularly reflecting light other than the light emitting element. The light is diffusely reflected so as to be weaker than the light emitted from the light emitter, so that the display screen can be easily viewed.

According to a third aspect of the present invention, in the display device according to the third aspect, the reflecting portion reflects light other than the light emitting body at an angle different from the light emitted from the light emitting body. Wherein the light other than the light emitter reflected by the reflector and the light emitted from the light emitter are not overlapped to make the display screen easier to see.

A display device according to a fourth aspect of the present invention is the display device according to the third aspect, wherein the reflective section has a saw-like side cross section, and the light other than the luminous body reflected by the reflective section is reflected by the reflective section. The display screen is made easier to see by not superimposing the light emitted from the light emitter, and the size of the reflector is reduced.

A display device according to a fifth aspect of the present invention is the display device according to any one of the first to fourth aspects, further comprising a light-shielding portion that shields light other than the light-emitting body. The light outside the illuminant is shielded by a light-shielding part, and the light irradiated to the reflecting part without being shielded by the light-shielding part is prevented from being reflected by the reflecting part. It is a smaller version.

An embodiment of the present invention will be described below with reference to FIGS. Embodiment 1 FIG. 1 is a side sectional view of a display device according to an embodiment of the present invention. FIG. 2 is an enlarged side sectional view of a reflecting portion of the display device according to the embodiment of the present invention. FIG. 3 is an exploded perspective view of the display device according to the embodiment of the present invention. FIG. 4 is a front view of the display device according to the embodiment of the present invention. FIG. 5 is an enlarged front view of the display device according to the embodiment of the present invention. Here, a light emitting diode (LED) is used as a light emitting body in the display device, and a surface including the light emitting body and the periphery of the light emitting body is a display screen, and is also a front surface of the display device (a surface seen from the front). Further, the display device according to the embodiment of the present invention is mounted on a wall perpendicular to the ground.

As shown in the side sectional view of the display device of FIG.
The display device includes a front cover 1, an LED board 2, and an outer frame 3. The LED board 2 is provided with an LED 4 that is a light emitting body that performs display by light, and the brightness of the LED 4 is controlled by a display control device (not shown). Further, the front cover 1 is provided with a light-shielding portion 5 and a reflection portion 6. Here, the reflective portion 6 has a black or irregularly reflected shape having a poor reflectance on the display screen side.

Further, in FIG. 1, incident light incident on the display device from an external light source is described as an incident light 7 by using an arrow in a sectional side view of the display device. Here, the incident light 7 is assumed to be incident in the direction of the arrow, and sunlight is assumed as the incident light.

The light emission of a general LED will be described. The light emission is performed at a portion called a bare chip at substantially the center of the LED, and the light on one axis passing through the bare chip is strong, and the light becomes weaker away from the axis. Become. Further, the light is dispersed and diffused as the distance from the bare chip increases, so that the light is weakened.

In a display device, the smallest unit separated by a difference in light color or luminance when an image is displayed is called a picture element. In other words, one picture element has a light-emitting portion composed of one or a plurality of light-emitting members, which makes the light to be irradiated recognized as a point by a viewer. However, one picture element is
Not only the light emitting section but also the periphery of the light emitting section is included, and the space between the adjacent light emitting sections is also included in the picture element. Regarding the boundary between picture elements, if there is a boundary such as a cut or characteristic part of the member, that boundary is used as the picture element boundary, and if there is no boundary, the light emitting unit It is desirable to be in the middle of these.

Therefore, there is a range in which the image displayed on the display device can be recognized or a range in which the image can be recognized, and this range is referred to as a visible range. That is, in FIG. 1, since the visible range is lower than the display device, the light-shielding portion 5 is disposed immediately above the light-emitting portion formed by using a plurality of LEDs 4 in one picture element, and By providing the reflecting portions 6 between the light shielding portions 5 in the picture elements, the light emitted from all the LEDs 4 can reach the direction of the viewing range without being blocked by the light shielding portions 5.

In FIG. 1, the direction indicating the center of the viewing range from the display device (the direction parallel to one axis where the light passing through the bare chip in the LED 4 is the strongest) is set as the viewing direction 8 and the incident light 7 is indicated by an arrow. Is described along with a side sectional view of the display device.

As shown in an enlarged side sectional view of the reflecting portion of the display device of FIG. 2, the reflecting portion 6 has a saw-like side section, and a reflecting surface 6a parallel to one side in one saw-like mountain. It has a reflective surface 6b parallel to the other side. In FIG. 2 as well, the incident light 7 which is incident on the display device is described in accordance with an enlarged sectional side view of the reflecting portion 6 using arrows as in FIG. Are described as incident light 7a and incident light on the reflecting surface 6b as incident light 7b.
a is referred to as reflected light 9a, and the reflected light of incident light 7b reflected by the reflecting surface 6b is referred to as reflected light 9b.

Further, the viewing direction 8 indicating the center of the viewing range from the display device is also shown in a side sectional view in which the reflecting portion 6 of FIG.
It is described using arrows as in FIG.

As shown in an exploded perspective view of the display device of FIG. 3, the light-shielding portion 5 and the reflection 6 can be formed integrally with the display cover 1.

As shown in the front view of the display device of FIG. 4 or the enlarged front view of the display device of FIG. 5, in the display device 10, one picture element 11 includes six LEDs 4 and
And a part of the reflection unit 6. Here, the number of picture elements of the display device 10 is 16 in the horizontal direction and 16 in the vertical direction, so that the total number is 256. By using a plurality of display devices 10, a large-sized video display device having a large number of picture elements and a large display screen can be obtained. For example,
When the display device 10 is arranged 22 horizontally and 16 vertically, the number of picture elements is 90112 and the area of the display device 10 is 35
A large image display device that is twice as large is obtained.

The LED 4 emits three primary colors of light, red, blue and green. The LED 4 emits light of the three primary colors and combines them by changing the brightness of each of the LEDs to produce combined light of various colors. Can be. Here, combined lights of various colors are also created under the control of the display control device (not shown). Also, as can be seen from FIG. 1, all the LEDs 4 are mounted at a lower angle than the horizontal plane, but this is because the display device is mounted at a relatively high position and the viewer is located at a position below the display device. This is because the viewing direction, which is the direction from the display device to the center of the viewing range, is lower than the horizontal direction.

The light-blocking portion 5 blocks the incident light 7 from being incident on the LED 4 and does not block the incident light 7 from being incident on the reflecting portion 6. The length of the side surface is shorter than that of the portion 16.

In the reflecting section 6, the reflecting surface 6a is incident light 7
And the reflection surface 6b is parallel to the horizontal direction.

Next, the reflection of the incident light 7 in the display device according to the embodiment of the present invention will be described in detail with reference to FIGS.

In FIG. 1, incident light 7 from an external light source assumed to be sunlight is shielded by the light shielding portion 5 as described above, and does not reach the LED 4.

Accordingly, since the incident light 7 is not incident on the LED 4, the incident light 7 is not reflected by the LED 4 to generate reflected light, and an image is displayed from the reflected light of the incident light 7 reflected by the LED 4 and the LED 4. Therefore, the light irradiated from the LED 4 does not become difficult to see in the viewing range centered on the viewing direction 8 because the light irradiated is not combined.

Also, an LED is used to represent a picture element in black.
4 is turned off, the incident light 7 is
Since the reflected light reflected by the light source 4 does not occur, the picture element can be displayed more black in the visual range centered on the visual direction 8 as compared with the case where the light shielding portion 5 does not exist.

In the portion of the reflecting section 6 where the incident light 7 is not shielded by the light shielding section 5, the incident light 7 arrives as shown in FIG. 2, but the incident light 7a arriving at the reflecting surface 6a is reflected by the reflecting surface 6a. The light is reflected in the direction of the light 9a. In addition, reflection surface 6
The incident light 7b arriving at b is reflected by the reflecting surface 6b in the direction of the reflected light 9b.

Here, the reflected light 9a is further reflected by the reflecting surface 6b, and the reflected light 9b is reflected by the reflecting surface 6a. However, since the reflectance of the reflecting portion 6 is low, it is reflected by the reflecting portion 6. The reflected light is light that is weaker than the incident light, and the reflected light that has been repeatedly reflected a plurality of times is light that is weaker than the reflected light that has been reflected less times.

Therefore, the reflected light 9a and the reflected light 9b in which the incident light 7 is reflected by the reflecting portion 6 or the reflected light in which the reflected light 9a and the reflected light 9b are reflected by the reflecting portion 6 are directed in the visual recognition direction 8. It is difficult to reach the central viewing range, and even if it does, the light is weak.

Further, in the portion of the reflecting portion 6 where the incident light 7 is shielded by the light shielding portion 5, no reflected light is generated similarly to the above-described incident light 7 to the LED 4. Does not obscure the image displayed on the display screen.

Therefore, as described above, the display of the image on the display screen viewed from the viewing range is not difficult to see, but is easy to see.

In the embodiment of the present invention, red, blue, or green L, which is the three primary colors of light, is used as the luminous body.
Although a plurality of EDs are used, the LED may be displayed in two colors or one color instead of three colors, or one LED may be used. In this case, light of a specific color other than white is irradiated, Since the color difference between the reflected light and the reflected light often occurs, it becomes easy to see the image displayed on the display device or the light emitted from the light emitter in the visible range.

In the embodiment of the present invention, FIG.
As shown in FIG. 5, the light shielding portion 5 is provided. However, if the light shielding portion 5 is removed, the light reflected in the viewing direction by the reflection portion 6 is weakened even if the incident light 7 from the external light source is not shielded. It is easy to see in the visible range, and the thickness of the side cross section of the display device can be reduced. However, when the light shielding unit 5 as shown in FIG. 1 is used, the light emitting unit 4 can be protected from rain and dust.

In the embodiment of the present invention, FIG.
2, it is assumed that the incident light 7 arrives from obliquely above. However, the incident angle of the incident light may be different, and in this case, the reflection surface is set so that the reflection direction is out of the viewing range. By setting the angle, it becomes easy to see in the viewing range.

In the embodiment of the present invention, the angle between the reflecting surface 6a and the reflecting surface 6b in the reflecting portion 6 is as shown in FIG.
However, the angle of the reflecting surface is not limited to the angle shown in FIG. 1. If the angle at which the incident light is reflected once by the reflecting surface does not reach the viewing range, the reflection that reaches the viewing range is obtained. The light becomes weak light, and the display of the image becomes easy to see.

In the embodiment of the present invention, the reflecting section 6 is shown in FIG. 1. However, the reflecting surface is not limited to that shown in FIG. The light may be irregularly reflected, change the color of the incident light, or may absorb the incident light so that the reflected light is dispersed and weakened, and the color of the incident light is reduced. In the case of changing the light, it means that the light of the specific wavelength is not reflected, so the reflected light is weakened by the light of the wavelength not reflected,
In the case of absorbing incident light, reflected light is weakened by an amount corresponding to the absorbed incident light. Therefore, it is easy to see in the visible range.

Also, the light-shielding portion 5 may be one that diffusely reflects the incident light, that changes the color of the incident light, or one that absorbs the incident light, in the same manner as the reflecting portion 6. Even if the light reflected by a part of the portion 5 reaches the visible range, the light reflected by the light shielding portion 5 is weakened, so that the light can be easily viewed in the visible range.

In the embodiment of the present invention, the LED
Although the positions of the light-shielding portion 4, the light-shielding portion 5, and the reflecting portion 6 are arranged as shown in FIG. 1, the positional relationship therebetween is not limited to that shown in FIG.
Any light may be used as long as the incident light 7 is not easily reflected by the LED 4, the light shielding unit 5, or the reflecting unit 6 in the viewing direction.

Also, as shown in FIG. 1, the incident light 7 and the viewing direction 8 are not limited to the incident light 7 obliquely above the display device or the viewing direction 8 obliquely below the display device. The directions may be different. In that case, the direction in which the light emitted from the bare chip of the LED 4 is the strongest, the length and angle of the side section of the light shielding portion 5, the angle between the reflecting surfaces 6a and 6b in the reflecting portion 6, or the LED
The mounting positions of the light-shielding portion 5, the light-shielding portion 5, and the reflection portion 6 are not blocked by the irradiation from the LED 4 in the viewing direction, the irradiation direction is the viewing direction, and the incident light is reflected in the viewing direction (LED 4, light-shielding). It is desirable that the reflection (reflection by the portion 5 or the reflection portion 6) be weakened.

[0052]

As described above, according to the present invention, a luminous body for performing display by irradiating light, and a luminous body positioned around the luminous body,
By providing a reflecting portion that reflects light other than the light-emitting body weaker than light emitted from the light-emitting body, reflection of light other than the light-emitting body can be suppressed, so that the display screen can be easily viewed.

In addition, since the reflecting portion has an irregular shape for irregularly reflecting light other than the light-emitting material, the light other than the light-emitting material is irregularly reflected so that the light is weaker than the light emitted from the light-emitting member, so that the display screen is easy to see. .

Further, since the reflecting portion reflects the light other than the light emitting body at an angle different from the light emitted from the light emitting body, the light other than the light emitting body reflected by the reflecting portion and the light emitted from the light emitting body are reflected. By not superimposing, the display screen becomes easier to see.

Further, by making the side cross section of the reflecting portion into a saw-like shape, the light other than the luminous body reflected by the reflecting portion and the light irradiated from the luminous body are not overlapped, so that the display screen can be easily viewed, In addition, the size of the reflecting portion is reduced.

Further, a light-shielding portion for shielding light other than the light-emitting body is provided, and light outside the light-emitting body irradiated to the light-emitting body is shielded by the light-shielding portion. By suppressing the reflection of the light irradiated on the display unit, the display screen is easily viewed and the size of the light shielding unit is reduced.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a display device according to an embodiment of the present invention.

FIG. 2 is an enlarged side sectional view of a reflection surface of a display device according to an embodiment of the present invention.

FIG. 3 is an exploded perspective view of a display device according to an embodiment of the present invention.

FIG. 4 is a front view of a display device according to an embodiment of the present invention.

FIG. 5 is an enlarged front view of the display device according to the embodiment of the present invention;

FIG. 6 is a side sectional view of a conventional display device.

FIG. 7 is an exploded perspective view of a conventional display device.

[Explanation of symbols]

 2 LED board 4 LED 5 Light shielding part 6 Reflecting surface 10 Display device 11 Picture element

Claims (5)

[Claims] 1. A light-emitting device which performs display by irradiating light, and a reflecting portion which is located around the light-emitting device and reflects light other than the light-emitting material more weakly than light emitted from the light-emitting device. Display device. 2. The display device according to claim 1, wherein the reflection section has an uneven shape for irregularly reflecting light other than the light emitted from the light-emitting body. 3. The display device according to claim 1, wherein the reflector reflects light other than the light emitting body at an angle different from light emitted from the light emitting body. 4. The display device according to claim 3, wherein a side cross section of the reflection section is saw-shaped. 5. The display device according to claim 1, further comprising a light-shielding portion that shields light other than the light-emitting body.