Monitor Case

Abstract

To provide a monitor case in which an image displayed on a display section can be stably viewed from the front of a front cover.SOLUTION: A monitor case includes a case body for housing a display device provided with a display portion having a liquid crystal panel, and a front cover supported by the case body and arranged on the front side of the display portion. The front cover has a substrate transmitting light, and a reflection suppressing layer formed on both a first surface on the front side of the substrate and a second surface on the back side to suppress the reflection of the light. In the substrate, a difference in the size of unevenness in a height direction in the first surface and the second surface is formed so as to be smaller than the size in a lateral direction of a slit of a polarizing plate on the front side provided on the liquid crystal panel. The reflection suppressing layer has a plurality of protrusions arranged in a direction inclined with respect to a longitudinal direction of the slit of the polarizing plate.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a monitor case. [Background technology]

[0002] At stations and terminals for railways, trams, etc., cameras and display devices are installed on platforms to ensure the safety of passengers getting on and off. Images captured by the cameras are displayed on the display device, and crew members such as conductors can safely open and close the doors by looking at the display device.

[0003] Display devices installed on platforms are sometimes housed in monitor cases. The monitor cases have a front cover placed in front of the display unit of the display device. Some front covers are provided with a reflection suppression structure that suppresses light reflection (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2019-28759 Summary of the Invention [Problem to be solved by the invention]

[0005] However, when a liquid crystal panel is used as the display unit in a configuration using the anti-reflection structure described in Patent Document 1, interference may occur between the front cover and the polarizing plate of the liquid crystal panel, resulting in the formation of interference fringes, depending on the configuration of the front cover and its position relative to the liquid crystal panel. In this case, it becomes difficult to stably view the image displayed on the display unit.

[0006] The present disclosure has been made in view of the above, and aims to provide a monitor case that allows a user to stably view an image displayed on a display unit from in front of the front cover. [Means for solving the problem]

[0007] The monitor case of the present disclosure comprises a case body that houses a display device provided with a display unit having a liquid crystal panel, and a front cover that is supported by the case body and is positioned on the front side of the display unit, the front cover having a light-transmitting substrate and a reflection-suppressing layer that is formed on both a first surface on the front side of the substrate and a second surface on the back side and that suppresses reflection of light, the substrate being formed so that the difference in height dimension of the irregularities on the first surface and the second surface is smaller than the short-side dimension of the slits in a polarizing plate on the front side of the liquid crystal panel, and the reflection-suppressing layer has a plurality of protrusions arranged in a direction inclined with respect to the longitudinal direction of the slits in the polarizing plate. [Effects of the Invention]

[0008] According to the present disclosure, it is possible to provide a monitor case that allows a stable view of an image displayed on a display unit from in front of the front cover. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a diagram showing an example of a monitor case according to the first embodiment. [Figure 2] FIG. 2 is a diagram illustrating an example of a monitor case according to the first embodiment. [Figure 3] FIG. 3 is a diagram schematically illustrating an example of a front cover and a display unit. [Figure 4A] FIG. 4A is a diagram schematically illustrating the relationship between the arrangement direction of a plurality of protrusions and the extension direction of the slits in the polarizing plate according to this embodiment. [Figure 4B] FIG. 4B is a diagram schematically illustrating the relationship between the arrangement direction of a plurality of protrusions and the extension direction of the slits in the polarizing plate according to the comparative example. [Figure 5] FIG. 5 is a diagram schematically illustrating an example of a display device according to the second embodiment. [Figure 6] FIG. 6 is a block diagram showing an example of a display device according to the second embodiment. [Figure 7] FIG. 7 is a flowchart showing an example of the operation of the display device according to the second embodiment. [Figure 8] FIG. 8 is a diagram (rear view) schematically illustrating an example of a monitor case according to the third embodiment. [Figure 9] FIG. 9 is a diagram (top view) that schematically shows an example of a monitor case according to the third embodiment. [Figure 10] FIG. 10 is a diagram (side view) that schematically shows an example of a monitor case according to the third embodiment. [Figure 11] FIG. 11 is a diagram showing a state in which the monitor case according to the third embodiment is used. [Figure 12] FIG. 12 is a diagram showing a state in which the monitor case according to the third embodiment is used. [Figure 13] FIG. 13 is a diagram showing a state in which the monitor case according to the third embodiment is used. [Figure 14] FIG. 14 is a diagram showing a state in which the monitor case according to the third embodiment is used. [Figure 15] FIG. 15 is a diagram showing a state in which the monitor case according to the third embodiment is used. [Figure 16] FIG. 16 is a diagram showing a state in which the monitor case according to the third embodiment is used. [Figure 17] FIG. 17 is a diagram showing a state in which the monitor case according to the third embodiment is used. [Figure 18] FIG. 18 is a diagram showing a state in which the monitor case according to the third embodiment is used. [Figure 19] FIG. 19 is a diagram showing a state in which the monitor case according to the third embodiment is used. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments of a monitor case, a display device, and a display method according to the present disclosure will be described with reference to the drawings. Note that the present invention is not limited to these embodiments. Furthermore, the components in the following embodiments include those that are easily replaceable by those skilled in the art, or those that are substantially identical. Hereinafter, when describing directions in this embodiment, the direction in which the display unit of the display device faces will be referred to as the front direction (front side), and the side opposite the front direction will be referred to as the rear direction (rear side). Furthermore, the upper side of the display device in its installed state will be referred to as the top (upper side), and the lower side will be referred to as the bottom (lower side). Furthermore, the direction perpendicular to the front-to-rear direction and the up-down direction will be referred to as the lateral direction (side side).

[0011] [First embodiment] 1 and 2 are diagrams showing an example of a monitor case 100 according to a first embodiment. FIG. 1 is a view from the front side, and FIG. 2 shows the configuration along the AA cross section in FIG. 1. The monitor case 100 shown in FIGS. 1 and 2 houses a display device 30. The display device 30 has a display unit 31 formed of a liquid crystal panel. The display unit 31 has a display surface 31a.

[0012] The monitor case 100 and the display device 30 are placed, for example, at a station or terminal platform of a railway, tram, etc. The display device 30 displays an image captured by a camera of the door of a vehicle such as a train and the surrounding area.

[0013] 1 and 2, the monitor case 100 has a case body 10 and a front cover 20. Note that while Fig. 2 shows the monitor case 100 in a state where the front side is tilted downward, the present invention is not limited to this configuration.

[0014] The case body 10 has a monitor housing section 11, a front frame section 12, and a hood section 13. The monitor housing section 11 houses the display device 30. The front frame section 12 is disposed on the front side of the monitor housing section 11 and supports a front cover 20 (described later). The hood section 13 is disposed across the top and both side sections of the front frame section 12. The hood section 13 blocks external light, such as sunlight, from entering the display device 30.

[0015] The front cover 20 is disposed in front of the display unit 31 and is supported by the front frame portion 12. FIG.

[0016] As shown in FIG. 3, the display unit 31 has a liquid crystal panel 32 and a polarizing plate 33. The liquid crystal panel 32 controls the arrangement of liquid crystal molecules for each pixel at different timings, for example, to allow light from a backlight to pass through to the front side. Optical elements such as a polarizing plate 33 and a phase plate (not shown) are arranged on the front side of the liquid crystal panel 32. The polarizing plate 33 has a plurality of slits 34 extending in one direction. The light that has passed through the layer of liquid crystal molecules is modulated by the optical elements such as the polarizing plate 33, and an image is formed by the modulated light.

[0017] The front cover 20 has a substrate 21 and an anti-reflection layer 22. The substrate 21 is, for example, rectangular. The substrate 21 transmits light, such as display light from the display unit 31. The substrate 21 has a first surface 21a on the front side and a second surface 21b on the rear side. The substrate 21 is formed so that the difference T1, T2 in the height direction of the irregularities on the first surface 21a and the second surface 21b is smaller than the dimension W of the slits 34 in the short direction of the polarizing plate 33.

[0018] The antireflection layer 22 is formed on both the first surface 21a and the second surface 21b of the substrate 21. The antireflection layer 22 suppresses reflection of light. The antireflection layer 22 has a structure in which a plurality of protrusions 24 are arranged in a regular height arrangement on a film 23. The plurality of protrusions 24 suppress reflection by controlling the reflection angle of light and transmitting it.

[0019] 4A is a diagram schematically illustrating the relationship between the arrangement direction of the plurality of protrusions 24 according to the present embodiment and the extension direction of the slits 34 in the polarizing plate 33. FIG. 4B is a diagram schematically illustrating the relationship between the arrangement direction of the plurality of protrusions 24A according to a comparative example and the extension direction of the slits 34A in the polarizing plate 33A. As shown in FIG. 4A, the plurality of protrusions 24 are regularly arranged in height in a direction D2 that is inclined with respect to the longitudinal direction D1 of the slits 34 in the polarizing plate 33. The angle between the arrangement direction D2 of the plurality of protrusions 24 and the longitudinal direction D1 of the slits 34 can be, for example, 45°.

[0020] When the front cover 20 having the antireflection layer 22 is placed in front of the display unit 31, the slits 34 of the polarizing plate 33 placed on the display unit 31 and the multiple protrusions 24 of the antireflection layer 22 are arranged with similar dimensions. If there is a large difference in the height dimension of the irregularities on the first surface 21a and the second surface 21b of the substrate 21, interference occurs between the multiple protrusions 24 and the slits 34 of the polarizing plate 33, resulting in interference fringes in the arrangement direction of the slits 34. Furthermore, as shown in FIG. 4B , when the arrangement direction of the multiple protrusions 24A on the antireflection layer 22A is aligned with the longitudinal direction of the slits 34A, interference fringes become more visible.

[0021] In contrast, in this embodiment, the substrate 21 is formed so that the difference T1, T2 in the height direction of the irregularities on the first surface 21a and the second surface 21b is smaller than the dimension W in the short direction of the slits 34 of the polarizing plate 33. Furthermore, the regular height arrangement of the multiple protrusions 24 is arranged in a direction tilted with respect to the longitudinal direction of the slits 34. This makes it possible to suppress the occurrence of interference fringes, and even if interference fringes occur, they can be made less visible.

[0022] As described above, the monitor case 100 of this embodiment comprises a case body 10 that houses a display device 30 provided with a display unit 31 having a liquid crystal panel 32, and a front cover 20 that is supported by the case body 10 and is arranged on the front side of the display unit 31. The front cover 20 has a light-transmitting substrate 21 and a reflection suppression layer 22 that is formed on both the first surface 21a on the front side of the substrate 21 and the second surface 21b on the back side, and that suppresses reflection of light. The substrate 21 is formed so that the difference in height dimension of the unevenness on the first surface 21a and the second surface 21b is smaller than the short dimension of the slits 34 in the front-side polarizing plate 33 provided on the liquid crystal panel 32, and the reflection suppression layer 22 has a plurality of protrusions 24 arranged in a direction inclined with respect to the longitudinal direction of the slits 34 in the polarizing plate 33.

[0023] With this configuration, it is possible to suppress the occurrence of interference fringes while suppressing reflections in the front cover 20, and even if interference fringes occur, they can be made less visible. As a result, when the front cover 20 is placed in front of the display unit 31 of the display device 30, the image displayed on the display unit 31 can be stably viewed from in front of the front cover 20.

[0024] In the monitor case 100 according to this embodiment, the front cover 20 is disposed in a direction that follows the display surface 31a of the display unit 31. With this configuration, the dimensions of the monitor case 100 in the front-to-rear direction can be reduced by disposing the front cover 20 in a direction that follows the display surface 31a.

[0025] In the monitor case 100 according to this embodiment, the regular vertical arrangement of the multiple protrusions 24 is arranged in a direction tilted at 45° with respect to the longitudinal direction of the slits 34. This configuration more reliably suppresses the occurrence of interference fringes in the front cover 20.

[0026] [Second embodiment] FIG. 5 is a diagram schematically illustrating an example of a display device 130 according to a second embodiment. FIG. 6 is a block diagram illustrating an example of a display device 130 according to the second embodiment. The display device 130 illustrated in FIGS. 5 and 6 is arranged, for example, on the platform of a station or terminal of a railway, tram, or the like, similar to the display device 30 according to the first embodiment. In this embodiment, the station or terminal where the display device 130 is arranged is provided with an incoming track sensor 140 that detects the entrance of a train. The incoming track sensor 140 outputs the detection result to a control unit 134, which will be described later. The display device 130 includes a display device main body 131, a display unit 132, an illuminance sensor 133, a control unit 134, and a storage unit 135. The display device main body 131 is housed in a monitor case 200.

[0027] The monitor case 200 has a case body 110 and a front cover 120. The case body 110 houses a display device 130. The front cover 120 is disposed in front of a display unit 132. The front cover 120 has a reflection suppressing layer 122 on its surface. The front cover 120 may have a configuration similar to that of the front cover 20 described in the first embodiment, for example.

[0028] Illuminance sensor 133 is disposed inside monitor case 200. Illuminance sensor 133 detects the illuminance inside monitor case 200. Illuminance sensor 133 detects the illuminance, for example, constantly or at predetermined timings, and outputs the detection result to control unit 134.

[0029] The control unit 134 comprehensively controls the operation of the display device 130. The control unit 134 has a processing device such as a CPU (Central Processing Unit) and a storage device such as a RAM (Random Access Memory) or a ROM (Read Only Memory).

[0030] The control unit 134 has an illuminance processing unit 136 and a display control unit 137. The illuminance processing unit 136 acquires the detection result from the train entry sensor 140. The illuminance processing unit 136 also acquires the detection result from the illuminance sensor 133. When the illuminance processing unit 136 acquires the detection result that a train has been detected entering the line, the illuminance processing unit 136 calculates the difference between the detection result from the illuminance sensor 133 at a first time point before the train entry detection time point at which the train entry was detected and the detection result from the illuminance sensor 133 at a second time point after the train entry detection time point.

[0031] The display control unit 137 controls the display operation of the display unit 132. The display control unit 137 acquires a detection result from the train entry sensor 140. When the display control unit 137 does not acquire a detection result indicating that a train has entered the line, the display control unit 137 places the display unit 132 in a standby state. The standby state includes a state in which the brightness of the display unit 132 is set lower than a predetermined brightness while the power of the display device 130 is on. The standby state includes a state in which the brightness of the display unit 132 is set to 0 while the power of the display device 130 is on. The standby state also includes a brightness suppression state in which the brightness of the display unit 132 is suppressed.

[0032] When the display control unit 137 acquires a detection result indicating that an incoming train has been detected, it sets the display unit 132 to an image output state. The image output state is a display state set so that a predetermined image can be properly viewed on the display unit 132. The image output state also includes a brightness suppression release state in which the brightness suppression state of the display unit 132 described above is released. An example of the predetermined image is an image captured by a camera installed on a station platform.

[0033] Display control unit 137 controls the luminance of display unit 132 in the image output state based on the measurement result of illuminance sensor 133. Display control unit 137 can control the luminance of display unit 132 in the image output state based on, for example, the difference calculated by illuminance processing unit 136. In this case, if the difference is equal to or greater than a predetermined value, display control unit 137 controls the luminance of display unit 132 in the image output state based on the detection result of illuminance sensor 133 at a first time point. On the other hand, if the difference is less than the predetermined value, display control unit 137 controls the luminance of display unit 132 in the image output state based on the detection result of illuminance sensor 133 at a second time point.

[0034] The storage unit 135 stores various types of information. The storage unit 135 has storage such as a hard disk drive or a solid state drive. Note that an external storage medium such as a removable disk may be used as the storage unit 135. The storage unit 135 stores, for example, a value that is set in advance as the luminance of the display unit 132. The storage unit 135 stores the luminance of the display unit 132 in association with, for example, the value of illuminance at the position where the illuminance sensor 133 is provided.

[0035] Next, an example of the operation of the display device 130 will be described. In the case of a display device 130 installed on a station platform, it is not necessary to display an image on the display device 130 when a train has not arrived at the platform. Therefore, the display control unit 137 puts the display unit 132 into a standby state when the train arrival sensor 140 does not detect the arrival of a train. The illuminance sensor 133 detects illuminance constantly or at predetermined times, and stores the detection result in the storage unit 135.

[0036] On the other hand, when a train arrives at the platform, by displaying an image on the display device 130, for example, a conductor or station staff member can check the safety of passengers getting on and off while looking at the display device 130, and can safely open and close the doors, etc. Therefore, when the train arrival sensor 140 detects that a train is entering the station, the display control unit 137 switches the display unit 132 from a standby state to an image output state. By this control, the image captured on the platform is displayed on the display unit 132.

[0037] In addition, when the train entry sensor 140 detects that a train is entering the line, the illuminance processing unit 136 calculates the difference between the detection result of the illuminance sensor 133 at a first point in time before the train entry detection point in time when the train entry was detected, and the detection result of the illuminance sensor 133 at a second point in time after the train entry detection point in time.

[0038] If the illuminance on the station platform is low at the first time point, the display light of display unit 132 has a greater effect on the detection result of illuminance sensor 133. This increases the difference between the detection result of illuminance sensor 133 at the first time point and the detection result of illuminance sensor 133 at the second time point. In this case, display control unit 137 controls the brightness of display unit 132 in the image output state based on the detection result of illuminance sensor 133 at the first time point.

[0039] On the other hand, if the illuminance on the station platform is high at the first time point, the influence of the display light of display unit 132 on the detection result of illuminance sensor 133 is reduced. Therefore, the difference between the detection result of illuminance sensor 133 at the first time point and the detection result of illuminance sensor 133 at the second time point is reduced. Therefore, in this case, display control unit 137 controls the luminance of display unit 132 in the image output state based on the detection result of illuminance sensor 133 at the second time point.

[0040] For example, the display control unit 137 can set the brightness corresponding to the illuminance value corresponding to the detection result as the brightness of the display unit 132 in the image output state based on the correspondence between illuminance and brightness stored in the memory unit 135.

[0041] This control sets the brightness of the display unit 132 according to the illuminance of the platform when the train is not entering the station and when it is entering the station, so that the display unit 132 is easy to see in either case. In addition, by putting the display unit 132 into a standby state when the train is not entering the station, the power consumption of the display device 130 is reduced.

[0042] 7 is a flowchart showing an example of the operation of the display device 130 according to the second embodiment. As shown in FIG. 7, the display control unit 137 sets the display unit 132 of the display device 130 to a standby state (step S101). The illuminance sensor 133 detects the illuminance inside the monitor case (step S102). In the control unit 134, the display control unit 137 determines whether or not the arrival of a train has been detected based on the detection result of the arrival sensor 140 (step S103).

[0043] If it is determined that an incoming train has not been detected (No in step S103), the display control unit 137 repeats the process of step S102.

[0044] When it is determined that the arrival of a train has been detected (Yes in step S103), the display control unit 137 sets the display unit 132 of the display device 130 to an image output state (step S104). In this case, the illuminance processing unit 136 calculates the difference between the detection result of the illuminance sensor 133 at a first time point before the arrival of the train is detected and the detection result of the illuminance sensor 133 at a second time point after the arrival of the train is detected (step S105).

[0045] If the calculated difference is equal to or greater than a predetermined value (Yes in step S106), display control unit 137 controls the luminance of display unit 132 in the image output state based on the detection result of illuminance sensor 133 at the first time point (step S107). On the other hand, if the calculated difference is less than the predetermined value (No in step S106), display control unit 137 controls the luminance of display unit 132 in the image output state based on the detection result of illuminance sensor 133 at the second time point (step S108).

[0046] The display control unit 137 determines whether or not a train has departed from the platform (step S109), and if it determines that the train has not departed from the platform (No in step S109), it repeats the processing from step S105 onwards. On the other hand, if it determines that the train has departed from the platform (Yes in step S109), it switches the display unit 132 from the image output state to the standby state (step S110). Thereafter, the display control unit 137 determines whether or not to terminate the operation of the display device 130 (step S111), and if it determines not to terminate the operation (No in step S111), it repeats the processing from step S102 onwards. If it determines that the operation of the display device 130 should be terminated (Yes in step S111), the display control unit 137 terminates the processing.

[0047] As described above, the display device 130 of this embodiment is arranged on a station platform, has a display unit 132, and comprises a display device main body 131 housed in a monitor case 200, an illuminance sensor 133 arranged inside the monitor case 200, and a control unit 134 that sets the display unit 132 to a standby state when an incoming train is not detected by an incoming train sensor 140 that detects the incoming train, and sets the display unit 132 to an image output state when an incoming train is detected by the incoming train sensor 140, and controls the brightness of the display unit 132 in the image output state based on the measurement results of the illuminance sensor 133.

[0048] The display method according to this embodiment is a display method using a display device 130 that is placed on a station platform, has a display unit 132, and is housed in a monitor case 200, and includes detecting the illuminance inside the monitor case 200, putting the display unit 132 into a standby state when an incoming train is not detected by an incoming train sensor 140 that detects the incoming train, putting the display unit 132 into an image output state when the incoming train sensor 140 detects the incoming train, and when putting the display unit 132 into the image output state, controlling the brightness of the display unit 132 in the image output state based on the measurement results of the illuminance inside the monitor case 200.

[0049] According to this configuration, the brightness of the display unit 132 is set according to the measurement result of the illuminance sensor 133 when the train is entering or leaving the line, so that the display unit 132 is easy to see in either case. In addition, by setting the display unit 132 to a standby state when the train is not entering the line, the power consumption of the display device 130 is reduced.

[0050] In the display device 130 according to this embodiment, when a train entering the line is detected, the control unit 134 calculates the difference between the detection result of the illuminance sensor 133 at a first time point before the train entering the line is detected and the detection result of the illuminance sensor 133 at a second time point after the train entering the line is detected, and controls the luminance of the display unit 132 in the image output state based on the calculated difference. According to this configuration, the luminance of the display unit 132 in the image output state is set based on the difference between the detection result of the illuminance sensor 133 at the first time point and the detection result of the illuminance sensor 133 at the second time point. This makes it possible to more reliably make the display unit 132 easier to see.

[0051] In display device 130 according to this embodiment, control unit 134 controls the luminance of display unit 132 in the image output state based on the detection result of illuminance sensor 133 at a first time point when the difference is equal to or greater than a predetermined value, and controls the luminance of display unit 132 in the image output state based on the detection result of illuminance sensor 133 at a second time point when the difference is less than the predetermined value. This configuration makes it possible to accurately set the luminance of display unit 132 according to the illuminance of the platform and the state of slight reflection from the image displayed on the monitor.

[0052] In the display device 130 according to this embodiment, the control unit 134 sets the brightness of the display unit 132 to a lower value than a predetermined value while keeping the power of the display device main body 131 on. This configuration makes it possible to more reliably reduce the power consumption of the display device 130 when the train is not on the line.

[0053] [Third embodiment] 8 to 10 are diagrams schematically showing an example of a monitor case 300 according to the third embodiment. Fig. 8 shows a view from the rear side, Fig. 9 shows a view from the top side, and Fig. 10 shows a view from the side.

[0054] As shown in FIGS. 8 to 10, the monitor case 300 includes a case body 210, a front cover 220, and a slide mechanism 230.

[0055] The case body 210 houses the display device 240. The rear surface of the case body 210 is provided with screw holes 210a for fixing the display device 240. The case body 210 has a frame 211. The frame 211 is disposed on the front side of the front cover 220.

[0056] The case body 210 has a waterproof packing 212 on a portion of the frame 211 that faces the front cover 220. The frame 211 and the waterproof packing 212 have openings at the portion where the display unit 241 of the display device 240 is located.

[0057] The front cover 220 is supported by the case body 210 and the slide mechanism 230. The front cover 220 covers the front side of the display unit 241 of the display device 240. The front cover 220 is held in a state where it is pressed against the waterproof packing 212 by a slide rod 231, which will be described later.

[0058] The slide mechanism 230 is slidable, for example, in the vertical direction relative to the case body 210. The slide mechanism 230 includes a slide rod 231 and a guide portion 232.

[0059] A pair of slide bars 231 are arranged at positions corresponding to the side edge portions 221, which are the edges on both sides of the sides of the front cover 220. The pair of slide bars 231 are connected by an upper connecting portion 233 and a lower connecting portion 234. The lower connecting portion 234 supports the lower portion of the front cover 220. The pair of slide bars 231 can slide together. The slide bars 231 can rotate around a rotation axis parallel to the sliding direction. The slide bars 231 have an elliptical or oval cross-sectional shape (see FIG. 9).

[0060] The slide rod 231 is disposed between a rear portion 232c of the guide portion 232, which will be described later, and a side edge portion 221 of the front cover in the front-to-rear direction. By adjusting the rotational position of the slide rod 231, it is possible to switch between a fixed state in which the long axis side presses the front cover 220 against the frame 211 of the case main body 210 to fix it, an open state in which the long axis side is separated from the front cover 220 to release the fixed state, and a maintenance state for performing maintenance on the front cover 220. In the fixed state, the rear end portion of the slide rod 231 on the long axis side presses the rear portion 232c, and the front end portion of the long axis side presses the front cover 220 toward the frame 211.

[0061] The slide bar 231 has an L-shaped lever 231a at its upper end in the sliding direction. The slide bar 231 also has an L-shaped hook 231b at its lower end in the sliding direction. When viewed from above, the lever 231a and the hook 231b are positioned at 90° offset from each other.

[0062] When the slide bar 231 is in the open state, the lever 231a is positioned to protrude rearward. When the slide bar 231 is in the open state, the hook 231b is positioned to protrude outward in the lateral direction. In this embodiment, the position at which the hook 231b protrudes outward in the lateral direction is a retracted position retracted from the holding position.

[0063] When the slide bar 231 is in the fixed state, the lever 231a is positioned to protrude laterally inward. When the slide bar 231 is in the fixed state, the hook 231b is positioned to protrude rearward. In this embodiment, the position at which the hook 231b protrudes rearward is a retracted position retracted from the holding position.

[0064] When the slide bar 231 is in the maintenance state, the lever 231a is positioned to protrude outward in the lateral direction. When the slide bar 231 is in the maintenance state, the hook 231b is positioned to protrude forward. In this embodiment, the forward protruding position is a holding position where the front cover 220 can be held.

[0065] The guide portion 232 guides the sliding movement of the slide bar 231. The guide portion 232 has an inner portion 232a, an outer portion 232b, and a back portion 232c. The inner portion 232a is arranged laterally inside the slide bar 231. The outer portion 232b is arranged laterally outside the slide bar 231. The back portion 232c is arranged on the back side of the slide bar 231. The guide portion 232 is arranged so that the inner portion 232a, the outer portion 232b, and the back portion 232c form a U-shape in cross section.

[0066] The guide portion 232 has a first slit 236a, a second slit 236b, and a third slit 236c. The first slit 236a is provided on the back surface portion 232c along the sliding direction. The width (lateral) dimension of the first slit 236a is formed so that the lever 231a of the slide bar 231 can be stored. When the slide bar 231 is in the open state, the lever 231a protruding rearward is inserted into the first slit 236a. This allows the slide bar 231 to slide smoothly.

[0067] The second slit 236b is provided at one end (in this embodiment, the upper end) of the first slit 236a in the sliding direction. The second slit 236b extends from the back surface portion 232c to the inner surface 232a, and laterally from the first slit 236a to at least one side (inward in this embodiment). The second slit 236b may be shaped to extend from the back surface portion 232c to both sides in the lateral direction from the first slit 236a, and from the inner surface 232a to the outer surface 232b. The second slit 236b is provided to allow the lever 231a of the slide bar 231 to pass through. The second slit 236b stores the lever 231a of the slide bar 231. When the slide bar 231 is in the fixed state, the second slit 236b stores the lever 231a protruding laterally inward. By storing the lever 231a in the second slit 236b, the lever 231a is locked in the vertical direction with the guide portion 232. This prevents the slide bar 231 from descending.

[0068] The third slit 236c is provided at the other end (in this embodiment, the lower end) of the first slit 236a in the sliding direction. The third slit 236c extends from the rear surface portion 232c to the outer surface portion 232b, from the first slit 236a to one lateral side (outward in this embodiment). The third slit 236c is provided to allow the lever 231a of the slide bar 231 to pass through. The third slit 236c stores the lever 231a of the slide bar 231. When the slide bar 231 is in the maintenance state, the third slit 236c stores the lever 231a that protrudes outward laterally. When the lever 231a is stored in the third slit 236c, the lever 231a and the guide portion 232 are locked in the vertical direction. This prevents the slide bar 231 from falling.

[0069] Next, an example of how to use the monitor case 300 configured as described above will be described. Figures 11 to 19 are diagrams showing how the monitor case 300 according to the third embodiment is used. When accommodating the display device 240, the display device 240 is placed inside the case main body 210, and then fastened to the case main body 210 with a screw member (not shown) via the screw hole 210a on the back surface of the case main body 210.

[0070] After fastening the display device 240, the front cover 220 is attached. When attaching the front cover 220, as shown in FIGS. 8 and 10, the pair of slide rods 231 are positioned so that the levers 231a are positioned at the lower ends of the first slits 236a. In this state, as shown in FIGS. 11 and 12, the rotational positions of the slide rods 231 are adjusted so that the levers 231a are stored in the third slits 236c. This adjustment places the slide rods 231 in a maintenance state. When the slide rods 231 are in the maintenance state, the hooks 231b are positioned in a holding position protruding forward. In this state, by placing the front cover 220 on the lower connecting portion 234, the hooks 231b can hold the front side of the front cover 220. Therefore, when performing necessary work on the front cover 220, it is possible to prevent the front cover 220 from falling off. Note that the slide rods 231 may be placed in an open state without being placed in the maintenance state, and the front cover 220 may be placed on the lower connecting portion 234.

[0071] After placing the front cover 220 on the lower connecting portion 234 or performing any necessary work, the rotational position of each slide rod 231 is adjusted so that the lever 231a is stored in the first slit 236a, as shown in Figures 8 and 10. When the lever 231a is stored in the first slit 236a, each slide rod 231 is in the open state. When each slide rod 231 is in the open state, the hook 231b is positioned in a retracted position protruding outward to the side.

[0072] After storing the lever 231a in the first slit 236a and setting each slide rod 231 in an open state, each slide rod 231 is pushed up as shown in Figures 13 and 14. This action causes each slide rod 231 to rise so that the lever 231a is aligned with the first slit 236a. When the lever 231a rises to the upper end of the first slit 236a, the front cover 220 is positioned in front of the display unit 241 of the display device 240 as shown in Figures 15 and 16.

[0073] After the lever 231a reaches the upper end of the first slit 236a, the rotational position of each slide bar 231 is adjusted so that the lever 231a is stored in the second slit 236b, as shown in FIGS. 17 and 18. By storing the lever 231a in the second slit 236b, each slide bar 231 is fixed. In this way, by providing the second slit 236b, the slide bar 231 can be rotated without interfering with the guide portion 232. Furthermore, by storing the lever 231a in the second slit 236b, the lever 231a is engaged with the back surface portion 232c of the guide portion 232, preventing the slide bar 231 from descending.

[0074] When each slide bar 231 is fixed, one of the long axis sides of the slide bar 231 presses the front cover 220 against the waterproof packing 212 of the frame 211, as shown in FIG. 19 . This fixes the front cover 220 to the frame 211. In this case, the other long axis side of the slide bar 231 is supported from the rear side by the rear portion 232c of the guide portion 232. Furthermore, the other long axis side of the slide bar 231 is fitted into the first slit 236a. This prevents the rotational position of the slide bar 231 from shifting. Note that when the slide bar 231 is fixed, the hook 231b moves to a position where it protrudes rearward. By fixing the slide bar 231 in this way, the installation of the display device 240 and the front cover 220 is completed.

[0075] The monitor case 300 and the display device 240 are used over a long period of time, so they require appropriate maintenance. Maintenance includes replacing the front cover 220. Replacing the front cover 220 includes removing the front cover 220 and installing the front cover 220. The above explanation is applicable to installing the front cover 220. The procedure for removing the front cover 220 that is in a fixed state will be explained below.

[0076] In this case, the rotational position of each slide bar 231 is adjusted from the state shown in FIGS. 17 and 18 so that the lever 231a stored in the second slit 236b is stored in the first slit 236a, as shown in FIGS. 15 and 16. Storing the lever 231a in the first slit 236a causes each slide bar 231 to enter an open state. With each slide bar 231 in an open state, the front cover 220 is released from its fixed position. The released front cover 220 is supported by the lower connecting portion 234. Furthermore, with each slide bar 231 in an open state, the hook 231b, which was positioned in a position protruding rearward, moves to a position protruding laterally.

[0077] From this state, each slide rod 231 is pulled downward. Each slide rod 231 is guided downward by the guide portion 232 so that the lever 231a follows the first slit 236a. When the lever 231a reaches the lower end of the first slit 236a, the front cover 220 is removed and a new front cover 220 is attached. This completes the replacement of the front cover 220. Note that, as shown in FIGS. 11 and 12, the slide rod 231 may be placed in a maintenance state, and necessary work on the front cover 220 may be performed. Thereafter, similarly to the above, the lever 231a is stored in the first slit 236a, and each slide rod 231 is raised so that the lever 231a is positioned at the upper end of the first slit 236a, thereby fixing each slide rod 231 in a fixed state. This completes the installation of the front cover 220.

[0078] As described above, the monitor case 300 according to this embodiment is a monitor case 300 that houses a display device 240 having a display unit 241, and includes a case main body 210 having a frame 211 on the front side, a slide mechanism 230 that is slidable in a predetermined slide direction relative to the case main body 210, and a front cover 220 that is housed in the case main body 210 with both side edge portions 221 in the lateral direction supported by the frame 211 by the slide mechanism 230 and covers the front side of the display unit 240, and the slide mechanism 230 is configured to slide relative to the side edge portions 221 of the front cover 220. The case body 210 has a pair of slide rods 231 that are arranged at positions corresponding to the front cover 220 and are rotatable around a rotation axis parallel to the sliding direction, and a guide portion 232 that is provided on the case body 210 and guides the pair of slide rods 231. The pair of slide rods 231 are arranged on the back side of the side edge portion 221 of the front cover 220 and have an elliptical or oblong cross-sectional shape, and by adjusting the rotation position, it is possible to switch between a fixed state in which the front cover 220 is pressed against the frame 211 on the long axis side to fix it, and an open state in which the long axis side is moved away from the front cover 220 to release the fixed state.

[0079] According to this configuration, the front cover 220 can be easily attached and detached by adjusting the rotational position of the pair of slide rods 231 to switch between a fixed state and an open state. Furthermore, by sliding the pair of slide rods 231 in the sliding direction relative to the case body 210, maintenance can be performed at a position away from the installation position of the monitor case 300. This reduces the burden of maintenance work on the front cover 220.

[0080] In the monitor case 300 according to this embodiment, the guide portion 232 has an inner portion 232a arranged on the inside in the lateral direction of the slide bar 231, an outer portion 232b arranged on the outside in the lateral direction of the slide bar 231, and a back portion 232c arranged on the back side of the slide bar 231, and has a U-shaped cross section, and the pair of slide bars 231 are arranged between the back portion 232c of the guide portion 232 and the side edge portion 221 of the front cover 220 in the front-to-back direction. With this configuration, the guide portion 232 can be configured to have both the function of guiding the slide bar 231 and the function of supporting the slide bar 231 from the back side when it is pressed against the front cover 220.

[0081] In monitor case 300 according to this embodiment, case body 210 has waterproof gasket 212 at a portion of frame 211 that faces side edge 221 of front cover 220, and front cover 220 is pressed against waterproof gasket 212 by rotation of a pair of slide rods 231. This configuration makes it possible to prevent moisture from entering the interior of monitor case 300.

[0082] In the monitor case 300 according to this embodiment, the pair of slide bars 231 have a lever 231a bent at their upper ends in the sliding direction, and the back surface portion 232c of the guide portion 232 has a first slit 236a extending along the sliding direction and through which the lever 231a can pass, a second slit 236b extending from the first slit 236a at one end of the sliding direction and extending laterally from the first slit 236a at least to one side and through which the lever 231a can pass, and a third slit 236c extending from the first slit 236a at the other end of the sliding direction and extending laterally from the first slit 236a at least to the other side and through which the lever 231a can pass, and the pair of slide bars 231 can store the lever 231a in the second slit 236b or the third slit 236c by adjusting the rotational position. According to this configuration, storing the lever 231a in the second slit 236b or the third slit 236c locks the lever 231a and the guide portion 232 in the sliding direction. This restricts the relative movement in the sliding direction between the slide bar 231 and the guide portion 232. Furthermore, the slide bar 231 can move without interfering with the guide portion 232.

[0083] In the monitor case 300 according to this embodiment, the pair of slide rods 231 have L-shaped hooks 231b at their lower ends, and by adjusting their rotational position, they can be set to a maintenance state different from the fixed state and the open state, with the hooks 231b positioned at a holding position where they can hold the lower end of the front cover 220 in the maintenance state, and the hooks 231b retracted from the holding position in both the fixed state and the open state. With this configuration, maintenance can be performed with the front cover 220 supported by the slide rods 231.

[0084] The technical scope of the present invention is not limited to the above-described embodiments, and appropriate modifications can be made without departing from the spirit of the present invention. [Explanation of symbols]

[0085] 10,110,210...Case body, 11...Monitor housing section, 12...Front frame section, 13...Hood section, 20,120,220...Front cover, 21...Substrate, 21a...First surface, 21b...Second surface, 22...Reflection suppressing layer, 23...Film, 24...Protrusion, 30,130,240...Display device, 31,132,241...Display section, 31a...Display surface, 32...LCD panel, 33...Polarizing plate, 34...Slit, 100,200,300...Monitor case, 131...Display device body, 133...Illuminance sensor , 134...control unit, 135...storage unit, 136...illuminance processing unit, 137...display control unit, 140...line incoming sensor, 210a...screw hole, 211...frame, 212...waterproof gasket, 221...side edge portion, 230...slide mechanism, 231...slide rod, 231a...lever, 231b...hook, 232...guide portion, 232a...inner portion, 232b...outer portion, 232c...back portion, 233...upper connecting portion, 234...lower connecting portion, 236a...first slit, 236b...second slit, 236c...third slit

Claims

1. a case body that houses a display device provided with a display unit having a liquid crystal panel; a front cover supported by the case body and disposed on a front side of the display unit, The front cover is a light-transmitting substrate; an anti-reflection layer formed on both a first surface on the front side and a second surface on the back side of the substrate to suppress reflection of light; and the substrate is formed so that a difference in a height direction dimension of the irregularities on the first surface and the second surface is smaller than a dimension in a short direction of a slit in a polarizing plate on a front side provided in the liquid crystal panel, The antireflection layer has a plurality of protrusions arranged in a direction inclined with respect to the longitudinal direction of the slits of the polarizing plate. Monitor case.

2. The front cover is disposed in a direction along the display surface of the display unit. The monitor case according to claim 1 .

3. The plurality of protrusions are arranged in a regular height arrangement in a direction inclined at 45° with respect to the longitudinal direction of the slit. The monitor case according to claim 1 or 2.

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