JP2014002228A - Image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image display device which captures external light radiated to the front of a screen and water droplets due to rainfall to allow the improvement of display performance.SOLUTION: A substantially tabular louver 2 disposed in the front of a light-emitting element substrate 11 is provided with an eaves part 2a protruding forward to block external light 6 and is provided with a light-emitting element hole 12a to which a front end part of a light-emitting element 12 is protruded and a capture hole 3 for capturing the external light 6. The capture hole 3 is a through hole inclined downward from a front surface to a rear surface of the louver 2 and is configured so that rain water deposited on the front surface of the louver 2 flows to the rear surface side of the louver 2 via the capture hole 3 and the external light 6 is taken into a space 5 between the louver 2 and the substrate.

Description

  The present invention relates to an outdoor type image display apparatus that performs display mainly by causing a large number of light emitting elements to emit light.

  In general, a large-sized image display device is configured by arranging a large number of display units composed of light emitting elements on a plane. Light emitting diodes (LEDs) are used as light emitting elements, and the arrangement and arrangement pitch of the light emitting elements of the three primary colors can be designed arbitrarily, so that a large image display device with various resolutions and brightness can be configured according to the application. I can do it now. However, large video display devices are often installed outdoors, and sunlight other than the video display device reaches the person watching the video display device due to the reflection of sunlight on the surface of the image display device. Make it difficult to see the video. That countermeasure is necessary.

Therefore, the conventional display device includes a through-hole provided to expose the tip of the light-emitting element, and in order to prevent sunlight from hitting the light-emitting element accommodated in the through-hole, A louver with a ridge higher than the tip height of the light emitting element in the upper horizontal direction is placed on the front surface of the printed circuit board in which a large number of light emitting elements are arranged in a matrix. It is filled around and attached using screws or the like.
As a method for further improving the contrast, a method of increasing the amount of sunlight blocked by further increasing the length of the heel tip, or by setting the louver surface other than the heel tip downward, the sunlight is lowered. There is a method of improving the contrast from the front by reflecting. However, the method of lengthening the heel tip has the harmful effect of narrowing the viewing angle in the vertical direction of the display device, and when sunlight is irradiated from a low altitude, the sunlight is blocked by the heel tip. It is difficult to prevent a decrease in contrast.

  Further, when water droplets such as rain adhere to the surface of the light emitting element, all or a part of the light emission of the element is blocked by the water droplet, and the light emission is locally extremely weakened, resulting in poor image uniformity and image quality. Therefore, the ridge is inclined in the horizontal direction in order to improve drainage and in the forward direction in order to improve the visibility from below. However, in general, the shape of the ridge alone is not effective, and water drops tend to accumulate on the top and tip of the ridge, the top and bottom of the light emitting element, and the tip. Therefore, a hydrophilic coating is applied to the surface of the louver to increase the hydrophilicity of the surface to prevent the water droplets from swelling, and the water droplets are smoothly adhered to the surface of the louver so as to smoothly flow downward. However, the coating cost is high, the life of the hydrophilic function is short, and the color uniformity is deteriorated due to uneven coating. Further, since the hydrophilic agent is white, the contrast is deteriorated.

In addition, when sunlight directly reaches the louver surface without being shielded from light by the louver ridge, a considerable amount of reflected light is generated. Therefore, in a conventional display device, a space region where no light emitting element is present is provided on a substrate on which light emitting elements are arranged, and an opening member having a concave portion when viewed from the display surface is attached to the space region, thereby reflecting external light. The amount of light is reduced. However, the depth of the concave portion needs to be set to be equal to or less than the thickness of the louver. Since the thickness of the louver is limited so that the tip of the light emitting element protrudes, there is a problem that sufficient performance cannot be exhibited (Patent Document 1).
Further, another display device has a louver structure in which a hole is provided in the lower portion of the light emitting element to allow water droplets to flow on the back of the louver in order to prevent water droplets from adhering to the louver and the light emitting element. In the case of this method, it does not have an effect on water droplets that have rained directly on the top of the ridge, and the water droplets adhere to the top of the element through the ridge. Further, when the light emitting elements are separated from each other, water droplet accumulation between the holes cannot be prevented (Patent Document 2).
In another image display device, a technique of reducing the amount of reflected light by capturing a part of sunlight by providing a capture hole penetrating a shade disposed in front of the image display device is used. . However, the capture hole is opened with a certain dimension in the direction perpendicular to the screen, that is, in the horizontal direction, and depending on the incident angle of sunlight, sunlight is reflected on the silicone resin surface at the back of the capture hole, In some cases, reflected light enters the eyes of the person viewing the screen (Patent Document 3).

JP 2009-230096 A JP-A-7-219453 Japanese Patent Application No. 2010-285819

The conventional image display device has a problem that high contrast cannot be obtained due to incidence of sunlight on the display screen and adhesion of water droplets to the surface of the display screen.
The present invention has been made to solve the above-described problems, and can significantly reduce the amount of reflected sunlight incident on the display screen, and can actively reduce the water droplets flowing on the surface of the display screen. An object of the present invention is to provide an image display device that can prevent water droplets from being attached to the liquid crystal.

  An image display device according to the present invention includes a light emitting element substrate in which a plurality of light emitting elements are arranged in a grid, and a substantially flat louver disposed on the front surface of the light emitting element substrate, the louver projecting forward. A flange portion for blocking external light is provided, a light emitting element hole for projecting the tip of the light emitting element and a capturing hole for capturing external light are opened, and the capturing hole extends from the front surface to the back surface of the louver in a predetermined direction. It is a through-hole which inclines in the following.

  In the image display device of the present invention, since the capture hole is a through hole inclined in a predetermined direction from the front surface of the louver, when rainwater adhering to the louver front side enters the through hole, the through hole is inclined downward in the inclination direction. Since rainwater can flow naturally, it is possible to eliminate the effect of diffuse reflection of light due to water droplets, and to adjust the direction of light reflection when the external light is incident on the inner wall surface of the through hole by the inclination of the capture hole And display characteristics of the image display device can be improved.

It is the front view and sectional drawing of the image display apparatus of Embodiment 1 of this invention. It is a louver capture hole expanded sectional view of the image display apparatus of Embodiment 1 of this invention. It is a front view of the image display apparatus of Embodiment 2 of this invention. It is a louver capture hole expanded sectional view of the image display apparatus of Embodiment 2 of this invention. It is sectional drawing of the image display apparatus of Embodiment 3 of this invention. It is a figure required in order to demonstrate this invention. It is a figure required in order to demonstrate this invention.

Embodiment 1 FIG.
An image display device (video display device) according to Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 2 and FIGS. 6 and 7. FIG. 1A is a front view of an image display device 1 according to Embodiment 1 of the present invention, and FIG. 1B shows a cross-sectional view taken along line AA of FIG. FIG. 2 is an enlarged cross-sectional view taken along line BB in FIG. 1A, and shows an inclination direction of the capturing hole 3 opened in the louver 2 and a reflection direction of the external light 6. FIG. 6 is a cross-sectional view necessary for explaining the effect of the capture hole 3 of the image display device 1 according to the present invention. The reflection direction of the external light 6 when the louver 2 in which the capture hole is not formed is used. Etc. FIG. 7 is a cross-sectional view necessary for explaining the effect of the capture hole 3 of the present invention. The capture hole 30 provided in the louver 2 is not inclined in a predetermined direction, but with respect to the flat surface of the louver 2. The direction in which the external light 6 is reflected when the capture hole 30 is opened in the horizontal direction when the screen is installed perpendicular to the ground is shown.

  As shown in FIG. 1A and FIG. 1B, the image display apparatus 1 includes a light emitting element substrate 11 in which a plurality of light emitting elements 12 are arranged in a lattice pattern, and a light emitting element except for a portion of the light emitting element 12. In order to project the waterproof silicone 4 that is a resin (eg, black resin) covering the surface of the substrate 11, the substantially flat louver 2 disposed on the front surface of the light emitting element substrate 11, and the tip of the light emitting element 12. The louver 2 includes a light emitting element hole 12a opened in the louver 2 and a capturing hole 3 that captures the external light 6 opened in the louver 2 and having a rectangular opening shape. Projecting from the flat portion (flat surface) 2 b, there is a flange portion 2 a extending between the light emitting elements 12 in a predetermined direction along the row of light emitting elements 12. Furthermore, it is mainly configured by a case 10 that accommodates the light emitting element substrate 11 and wiring that is taken out from the back surface (back surface) of the light emitting element substrate 11.

The capturing hole 3 provided in the louver 2 of the present invention extends in the form of a slit in the horizontal direction between the light emitting elements 12 serving as a gap region on the front surface (flat surface) of the flat portion 2b of the louver 2, and the front opening. It is the same size as the size, and is opened so as to be lowered from the front surface toward the back surface, that is, inclined downward from the front surface to the back surface side of the louver 2.
As shown in FIG. 2, the capturing hole 3 is opened so that the lower end of the capturing hole 3 on the front side of the louver 2 is higher than the upper end of the capturing hole 3 on the back side of the louver 2. When the capture hole 3 is observed from a direction perpendicular to the plane of the louver 2 (the surface portion of the flat portion 2b), only the inner wall surface of the capture hole 3 can be seen in the capture hole 3 and The waterproof silicone 4 is not visible.

  FIG. 6 is a main part diagram for explaining the operation of a conventional image display device (the light emitting element portion is omitted). When external light (for example, sunlight) 6 is reflected on the surface of the flat portion 2b of the louver 2 disposed on the front surface of the image display device 1, the reflected light 14 is reflected on the eyes 13 of the person who views the image display device 1. Enters and makes it difficult to visually recognize the image information displayed on the light emitting element 12. The reflected light 14 is a major factor that lowers the contrast of the image display apparatus 1. For this reason, the louver 2 is provided with a flange 2a so that the reflected light 14 does not enter the eye 13 as much as possible.

As shown in FIG. 6, when the incident light of the external light 6 enters at an incident angle α ° or less determined by the height of the flange 2a of the louver 2 (the amount of protrusion from the surface of the flat portion 2b) and the pitch, The reflected light 14 reflected by the surface of the flat portion 2 b of the louver 2 enters the eyes 13 of the person who looks at the image display device 1. On the other hand, when the incident light of the external light 6 enters at an incident angle α ° or more, the reflected light is blocked by the flange portion 2a of the louver 2 and does not enter the eyes 13 of the person viewing the image display device 1. The contrast does not decrease (the incident direction and the reflection direction of external light are not shown).
However, although depending on the position of the person viewing the image display device 1 and the solar altitude, the heel part 2a is generally effective when the solar altitude is high, but sufficient effects are obtained when the solar altitude is low. I can not expect. Increasing the collar 2a (increasing the amount of protrusion) blocks light emitted from the light emitting element (not displayed) and narrows the viewing angle in the vertical direction, so that the height of the collar 2a is too high. I can't.

  In the image display device 1 according to the present invention, as shown in FIGS. 1 and 2, the louver 2 is provided with the inclined capturing hole 3 for capturing the external light 6, so that the surface of the louver 2 is less than α °. Even when the external light 6 is incident, the external light 6 can be efficiently captured because it enters the back side of the louver 2 after being reflected by the inner wall of the capture hole 3 as shown in the optical path of FIG.

Next, operations and effects of the image display apparatus according to Embodiment 1 will be described.
In order to prevent the reflected light 14 reflected by the surface of the flat portion 2b of the louver 2 from entering the external light 6 at an incident angle α ° or less, the louver 2 is given a predetermined value. By opening the capture hole 3 which is a through hole inclined in the direction, the external light 6 is taken into the gap (the gap between the louver 2 and the waterproof silicone 4) 5 on the back side of the louver 2 to reduce the dark luminance.

  However, as shown in FIG. 7, the flat portion 2b of the louver 2 simply has a capture hole 30 perpendicular to the flat surface (when the screen is installed in a direction substantially perpendicular to the ground, the capture hole 30 is In the direction of the thickness of the louver, that is, in the horizontal direction, the external light 6 is not directly reflected by the flat portion 2b of the louver 2 but is viewed from the place B. By reflecting light several times in the gap 5 and absorbing the light on the back surface of the waterproofing silicone 4 and the louver 2, the amount of reflected light emitted from another capture hole 30 located at the lower part is reduced, and the flat portion 2 b of the louver 2 It can be lower than the emitted brightness. However, for the human looking from the location A, the reflected light 14 reflected by the waterproof silicone 4 is directly received.

  In the cross-sectional view of FIG. 7, as an example where the distance between the two capturing holes 30 arranged at the top and bottom is short, two traps are captured in the flat part 2 b sandwiched between the two upper and lower flange parts 2 a of the louver 2. Although the case where the hole 30 is provided is illustrated, for example, as in the arrangement of the capture hole 3 shown in FIG. 1A, between the upper and lower two flange portions 2a and in the middle of the side-by-side light emitting elements 12, The same applies to the case where one capturing hole 30 extending in the horizontal direction is formed. If the opening direction of the capturing hole is horizontal, the waterproof silicone 4 in the back can be seen from the capturing hole. It is assumed that the reflected light 14 reflected by the waterproof silicone 4 enters the human eye 13 and deteriorates the display performance.

  Therefore, in the first embodiment, a trapping hole 3 as shown in FIG. 2 (enlarged sectional view taken along line BB in FIG. 1) is proposed. The shadow of the louver 2a of the louver 2 and when the line of sight reaches the back of the display device when viewed from the human eye (or an imaging unit such as a camera) 13, is the position of the human eye 13 in FIG. When looking up at the screen, only the inner wall of the capture hole 3 can be seen, and the waterproof silicone 4 cannot be seen from any other angle. That is, unlike the case of FIG. 7, in the case of FIG. 2, the light reflected by the external light 6 incident on the back surface of the louver 2 does not directly enter the eyes 13 of the person viewing the screen at any angle. . Further, since the capture hole 3 is opened so as to be inclined downward from the front surface to the back surface of the louver 2, when it is assumed that the sun is above the image display device 1, the external light 6 enters the capture hole 3. The reflected light 14 has a hole structure that is easy to enter and difficult to exit from the capturing hole 3. The inclination angle of the capture hole 3 is determined by the length of the flange portion 2a, the position and vertical width of the capture hole 3, and the thickness of the flat louver 2. Moreover, this capture hole 3 can be manufactured by a slide mold from the back side of the louver 2, for example.

As shown in FIG. 2, the ridge 2a of the louver 2 shows an example of being formed in a straight line in the horizontal direction on the screen. However, the shape is not limited to this shape, and a similar light shielding function is provided. It is possible to have another shape. Further, as shown in FIG. 1A, in the first embodiment, the light emitting elements 12a are opened in the louver 2 at predetermined intervals in the lateral direction, and the central portion of the two light emitting element holes 12a and the upper and lower flanges are provided. The example which has arrange | positioned one capture hole 3 in the intermediate position of 2a (substantially center part of a gap area | region) is shown. By opening the capture hole 3 at the center of the gap region, which is a relatively wide surface portion on the flat portion 2b of the louver 2, or at a lower position from the center, the region where the light shielding effect by the flange portion 2a is reduced (sunlight is outside) In the case of the light 6, the display performance of the portion immediately below the collar portion 2a is always a shadow of the collar portion 2a, so that the light shielding effect is great.
Note that the arrangement and the number of the capture holes 3 are not limited to this, and for example, the capture holes 3 can also be arranged on the flat portions 2b located above and below the light emitting element 12.
In addition, by using this trapping hole structure, it is possible to actively flow rainwater to the back surface side of the louver 2 and to prevent rainwater from flowing backward from the back surface of the louver 2, Water droplets can be prevented from sticking.

Embodiment 2. FIG.
In the above-described first embodiment, as shown in FIGS. 1 and 2, when the image display device 1 is viewed in the vertical direction, the flat portion 2 b sandwiched between the upper and lower flange portions 2 a of the louver 2 includes The trapping holes 3 are provided one by one between the side-by-side light emitting elements 12, and the trapping holes 3 are inclined downward from the front surface to the back surface. In the second embodiment, as shown in FIGS. 3 and 4, the flat portion 2b sandwiched between the upper and lower flange portions 2a is provided with two capturing holes 3a and 3b on the upper and lower sides, and the capturing holes 3a, The case where the inclination of 3b is opened so that the heights of the upper ends of the capturing holes 3a and 3b on the back side of the louver 2 are the same as the lower ends of the capturing holes 3a and 3b on the front side of the louver 2 will be described.

The operation and effect of the image display device according to the second embodiment will be described. 3 is a front view of the image display device 1 to which the louver 2 of the second embodiment is attached, and FIG. 4 is an enlarged cross-sectional view along the line BB in FIG. Note that the cross-sectional view taken along the line AA in FIG. 3 is the same as FIG.
As shown in FIG. 4, the through holes of the capturing holes 3 a and 3 b are inclined so that the lower end of the front side of the flat part 2 b of the louver 2 and the upper part of the hole on the back side have the same height. The louver 2 prevents the incident light of the external light 6 from entering the eyes 13 of the person viewing the image display device 1 upward with the incident angle α ° or less and reflected from the surface of the flat portion 2b of the louver 2. 4, the external light 6 is taken into the louver 2 (gap 5) and the dark luminance is lowered.

  At this time, as shown in FIG. 4, since the lower end of the hole on the front side and the upper end of the hole on the back side of the flat portion 2b of the louver 2 have the same height, the eyes 13 of the person looking up at the image display device 1 upward As seen from above, the waterproof silicone 4 in the back cannot be seen no matter what angle the opening portions of the catching holes 3a, 3b are looked up from. The reflected light 14 reflected from the external light 6 incident on the back surface of the louver 2 does not directly enter the eye at any angle as long as the human eye 13 is facing upward. Further, since the capture holes 3a and 3b are directed downward as seen from the surface of the louver 2 as in the first embodiment, the external light 6 easily enters the capture holes 3a and 3b, and the reflected light 14 is captured by the capture holes 3a and 3b. It has a hole structure that is harder to come out than 3b.

The capturing hole 3 of the second embodiment is such that the height of the upper end of the capturing hole 3a (3b) on the back side of the louver 2 is the same as the height of the lower end of the capturing hole 3a (3b) on the front side of the louver 2. If the inclination angle is adjusted and the condition of opening is satisfied, the opening size and position are free. The inclination angle is determined by the thickness of the louver 2 and the opening dimension in the height direction. Further, when the screen is viewed in the vertical direction, if the interval between the upper flange portion 2a and the lower flange portion 2a is wide, it is possible to arrange any number of the capture holes 3a and 3b. In addition, as shown in FIG. 1 described above, even when one capture hole 3 is disposed between the upper and lower flanges 2a, the inclination angle can be limited and provided as in the capture hole 3a or 3b.
The capture holes 3a and 3b can be manufactured by a slide mold from the back side of the louver 2 as in the first embodiment.

In addition, by adopting the trapping hole structure according to the second embodiment, it is possible to positively flow rainwater to the back surface of the louver 2, prevent rainwater from flowing backward from the back surface of the louver 2, and There are no restrictions on the position or number of the capture holes 3a and 3b provided on the flat portion 2b of the light source, and unlike the conventional case, the capture holes 3 can be provided in addition to the light emitting element holes 12a located below the light emitting elements 12. Therefore, it is possible to prevent water droplets from adhering to the light emitting element 12. Since there are many application examples of the image display apparatus 1 installed at a position where a person looks up (for example, when a screen is installed at a position higher than the audience seat in a stadium), it is effective in improving display performance.
In addition, if the angle of the capture holes 3a and 3b is steep, the thickness of the louver 2 may be partially reduced to cause problems such as strength. However, as in the second embodiment, the inclination of the holes If the angle is limited, it can be avoided that the louver 2 is partially thinned, a certain strength is obtained, and an effect that the maintainability is good is also obtained.

  Here, the state illustrated in the cross-sectional view in FIG. 4 is the capture hole 3a so that the human eyes 13 or the camera can obtain a state in which the waterproof silicone 4 in the back cannot be seen from any angle when looking up at the screen. The heights of the lower end on the front side of 3b and the upper end on the back side of the catching holes 3a and 3b are aligned. However, under the installation conditions where the look-up angle of the screen is assumed to be relatively large, the louver 2 is captured even if the rear surface side upper ends of the capturing holes 3a and 3b are higher than the front surface lower ends of the capturing holes 3a and 3b. If the inclination of the holes 3a and 3b is downward from the front surface to the back surface of the louver 2, the effect of improving the display performance can be obtained.

  Further, under the installation conditions where it is assumed that the screen of the image display device 1 is looked down, the capture hole is inclined upward from the front surface to the back surface of the louver 2, contrary to the case described above. By forming in this way, it becomes difficult for the line of sight to reach the back of the capture hole, the reflected light 14 reflected by the waterproof silicone 4 at the back of the capture hole is difficult to enter the human eye 13, and from obliquely above It is also possible to improve the display characteristics by guiding and attenuating the external light 6 that is sunlight falling into the capture hole while reflecting it many times in the capture hole, and even in the case of the above-described first embodiment, The same can be said. However, it goes without saying that it is necessary to adjust the angle of the trapping hole so that the external light 6 has an inclination angle that does not directly reflect the light toward the human eye 13.

Furthermore, in addition to forming all the capturing holes of the louver 2 at a uniform inclination angle for one image display device 1, it is also possible to use a combination of capturing holes with different inclination angles.
If the capture hole is opened horizontally, there is a concern that rainwater will accumulate in the opening and cause irregular reflection of light, but the capture hole is lower on the front side than on the back side. In the case of opening, rainwater flows to the front without collecting in the catching hole, but although rainwater cannot flow naturally to the back side of the catching hole, the above-described adverse effects due to the rainwater pool can be eliminated.

Embodiment 3 FIG.
Next, an image display device 1 according to Embodiment 3 will be described with reference to FIG. FIG. 5 is an enlarged cross-sectional view of the image display device 1 according to the third embodiment. In the first and second embodiments described above, an example in which the front surface of the flat portion 2b of the louver 2 is a flat surface has been described. In the third embodiment, as shown in FIG. 5, the flat portion 2bb of the louver 2 has an uneven surface structure (uneven portion) in which fine protrusions are continuously provided. For example, the portion is formed in a protruding shape formed by combining planes having different inclinations. The protrusion extends, for example, in a straight line in the lateral direction.

As shown in FIG. 5, when the protrusion on the surface of the flat portion 2bb of the louver 2 is viewed from the side, it is formed so as to protrude in a triangular shape, and the gradient of the protrusion forming plane is the surface of the fine triangular protrusion. When the external light 6 enters and is reflected, the angle is set so that the reflected light 14 is entirely applied to the top surface or the bottom surface of the flange 2a. Here, the top surface of the collar part 2a is the upper surface of the collar part 2a that protrudes in the horizontal direction, and is the surface directly irradiated with the external light 6 that is sunlight, and the lower surface on the back side is the back surface. is there. Thereby, the reflection of light from the flat portion 2bb of the louver 2 can be greatly reduced. Although reflection from the top surface and the back surface of the collar portion 2a increases, it is considered that there is no influence because it is outside the viewing angle of the light emitting element 12.
When the entire surface of the flat portion 2bb is an uneven portion, it is possible to reflect the external light 6 incident on the uneven portion in a direction that does not leak and does not affect the viewing, and partially includes the uneven portion. In comparison, the display performance of the image display device 1 can be further improved.

In the above description, the case where the concavo-convex portion of the flat portion 2bb of the louver 2 is a projection-like shape formed by combining planes with different inclinations is described. This is because it is easy to assume in which direction the light incident on the surface is reflected, and the tilt angle can be easily adjusted. However, if the reflected light 14 does not enter the eyes 13 of the person viewing the screen, the surface of the concavo-convex portion is not limited to a flat surface, and a configuration using a curved surface is also possible.
Needless to say, the present invention can be freely combined with each other within the scope of the invention, and each embodiment can be modified or omitted as appropriate.

DESCRIPTION OF SYMBOLS 1 Image display apparatus 2 Louver 2a Gutter part 2b, 2bb Flat part 3, 3a, 3b, 30 Capture hole 4 Waterproofing silicone 5 Crevice 6 External light (sunlight)
DESCRIPTION OF SYMBOLS 10 Case 11 Light emitting element board | substrate 12 Light emitting element 12a Light emitting element hole 13 Human eye (imaging part of a camera)
14 Reflected light.

Claims (6)

  A light-emitting element substrate in which a plurality of light-emitting elements are arranged in a grid pattern, and a substantially flat louver disposed on the front surface of the light-emitting element substrate, the louver being provided with a flange that projects forward and blocks external light. In addition, a light emitting element hole for projecting the tip of the light emitting element and a capturing hole for capturing outside light are opened, and the capturing hole is a through hole inclined in a predetermined direction from the front surface to the back surface of the louver. A characteristic image display device.   When the flat surface of the louver is installed substantially perpendicular to the ground, the capturing hole extends in a slit shape in the horizontal direction on the flat surface of the louver and is inclined downward from the front surface to the back surface of the louver. The image display device according to claim 1, wherein the image display device is opened.   3. The image according to claim 2, wherein the capture hole is opened such that a height of the upper end of the capture hole on the back side of the louver is equal to a height of the lower end of the capture hole on the front side of the louver. Display device.   4. A concavo-convex portion is formed on the front side of the louver, and external light incident on the concavo-convex portion is reflected on the top surface or the back surface of the collar portion. Image display device.   The image display device according to claim 4, wherein the concavo-convex portion is formed in a protruding shape formed by combining planes having different inclinations. 6. The image display device according to claim 4, wherein the uneven portion is formed on the entire flat surface on the front side of the louver.

Images