Display device

Abstract

To provide a display device which can achieve both a display and a defroster.SOLUTION: A display device comprises a display 20, a circuit board 40 which is disposed below the display 20 and controls the display 20, an intermediate case member 30 which is disposed below the display 20 and holds the display 20, a cover member 50 which is disposed below the intermediate case member 30 and covers a back side of the intermediate case member 30, and a case member 10 having an upper case member 60 which includes a transmission part 63 which covers an upper part of the display 20 to make the display 20 visible, and a lower case member 70 which stores the display 20, the circuit board 40, the intermediate case member 30 and the cover member 50 with the upper case member 60. The case member 10 includes a first inlet 64 into which air flows from a vehicle and a first outlet 65 from which air flows to the outside, and is formed with a first flow channel 52 through which air flows from the first inlet 64 to the first outlet 65 by the cover member 50 and the lower case 70.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to a display device mounted on a vehicle or the like. [Background technology]

[0002] An example of a conventional display device is disclosed in Patent Document 1. The display device according to Patent Document 1 reflects display light from a display (head-up display unit) arranged near the front windshield of an instrument panel in a vehicle, off the front windshield, and displays a virtual image to the driver. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-308090 Summary of the Invention [Problem to be solved by the invention]

[0004] However, since the display is located near the front windshield of the instrument panel, there is a problem in that there is no space to place a defroster.

[0005] The present disclosure has been made in consideration of the above circumstances, and aims to provide a display device that can function as both a display and a defroster. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems, the display device of the present disclosure includes a display unit 20, a circuit board 40 that is arranged below the display unit 20 and controls the display unit 20, an inner case member 30 that is arranged below the display unit 20 and holds the display unit 20, and a display unit 40 that is arranged below the inner case member 30 and holds the inner case member 30. downwardthe display unit 20, the upper case member 60 having a transparent portion 63 that covers the display unit 20 and makes the display unit 20 visible; and a lower case member 70 that houses the display unit 20, the circuit board 40, the middle case member 30, and the cover member 50 together with the upper case member 60. The case member 10 has a first inlet 64 that is connected to a defroster duct C31 of the vehicle and that allows air to flow into the interior, and a first outlet 65 that allows the air to flow out to the exterior. The cover member 50 and the lower case member 70 form a first flow path 52 that allows the air to flow from the first inlet 64 to the first outlet 65. The transparent portion 63 is formed in a position on an instrument panel C1 of the vehicle that faces a front windshield C2 of the vehicle, and the first outlet 65 is formed in a position between the front windshield C2 and the transparent portion 63. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a perspective view showing a display device according to an embodiment. [Figure 2] FIG. 2 is a perspective view showing a display of the display device. [Figure 3] Cross-sectional view taken along line AA in Figure 2. [Figure 4] 3 is a cross-sectional view taken along line BB in FIG. 2. [Figure 5] Cross-sectional view taken along line DD in Figure 2. [Figure 6] 4 is a view mainly showing the heat sink 30 as seen from the arrow E in FIG. 3. [Figure 7] 4 is a view mainly showing the cover member 50 as seen in the direction of the arrow F in FIG. 3. DETAILED DESCRIPTION OF THE INVENTION

[0008] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a display device according to the present disclosure will be described with reference to the accompanying drawings. The display device can be mounted on a vehicle such as an automobile or a motorcycle, a ship, an agricultural machine, or a construction machine, for example.

[0009] In the following description, as shown in Figure 1, the direction in which a driver seated in the driver's seat of a vehicle looks out the front windshield C2 is referred to as "front," and the opposite side is referred to as "rear." Furthermore, the up and down directions (To., Bo. in the figure) correspond to the top and bottom directions of the vehicle. Furthermore, the left and right directions (L, R in the figure) correspond to the directions in which the vehicle turns right or left. These "front," "rear," "up," "down," "right," and "left" are indicated by the definitions "Fr.", "Re.", "To.", "Bo.", "R," and "L" in Figures 1 to 7.

[0010] As shown in Figure 1, the display device is a so-called HUD (head-up display) that reflects display light consisting of an image emitted from a display device 1 arranged near the front windshield C2 of the automobile's instrument panel C1 on the front windshield C2, causing the driver to see the image as a virtual image V.

[0011] The instrument panel C1 is a part of an automobile, also known as a dashboard, located in front of the driver's seat and passenger seat. The instrument panel C1 has a rectangular hole C11. The hole C11 is formed in a position facing the front windshield C2, and exposes the display 1.

[0012] The instrument panel C1 has defroster holes C12 on the left and right of the hole C11, which are holes for a defroster device. The defroster device is a well-known device that blows air (wind) at a temperature of less than approximately 30°C onto the front windshield C2 to prevent condensation (fogging) on ​​the front windshield C2 and ensure the driver's visibility.

[0013] The front windshield C2 is, for example, a windshield in front of the driver of an automobile, which is made up of two pieces of laminated glass. The front windshield C2 has a masking portion C21 on its periphery, as shown by hatching in Fig. 1. The masking portion C21 is a light-blocking black ceramic coating formed between the two pieces of glass in the front windshield C2.

[0014] Display light consisting of an image emitted from the display device 1 is reflected by the masking portion C21 and directed toward the driver's line of sight. This allows the driver to see the display at the position of virtual image V shown in Figure 1. In addition, the background of this display is masked by the masking portion C21, and the background of the display by virtual image V is always black regardless of the surrounding scenery, so extremely high-contrast display visibility can be obtained regardless of the surrounding environment.

[0015] The automobile has a defroster duct C3, which is a pipe for a defroster device. The defroster duct C3 has a first duct C31 that branches off from the defroster duct C3 and is connected to the display 1, and a second duct C32 that branches off from the defroster duct C3 and is connected to the defroster hole C12.

[0016] As shown by the thin arrows in Figure 1, when a driver turns on the defroster switch of the vehicle to defog the front windshield C2, air (wind) at the temperature set by the driver flows through the defroster duct C3. This air branches into the first duct C31, flows into the display 1, is released from the display 1, and is blown onto the front windshield C2. This air also branches into the second duct C32, is released from the defroster hole C12, and is blown onto the front windshield C2.

[0017] In addition to the defroster duct device, the automobile also has a center register device and a side register device (neither of which are shown) that release air into the automobile from the instrument panel C1, and has dedicated ducts for these devices. The third duct C4 is a duct that branches off from the center register duct and is connected to the display 1. The fourth duct C5 is a duct that is not connected to the defroster duct C3, the center register duct, or the side register duct, and has an opening facing the driver's feet below the instrument panel C1.

[0018] As shown by the bold arrow in Figure 1, when the driver turns on the air conditioning switch to adjust the temperature inside the car, air at the temperature set by the driver flows through this center register duct. This air branches off into the third duct C4, flows into the display unit 1, and from the display unit 1 flows into the fourth duct C5 and is released toward the driver's feet.

[0019] As shown in FIGS. 2 and 3, the display device 1 mainly includes a case member 10, a display unit (display section) 20, a heat sink (intermediate case member) 30, a circuit board 40, and a cover member 50.

[0020] The case member 10 is made of, for example, black synthetic resin, and is formed into a box-like rectangular parallelepiped, and houses therein a display unit 20, a heat sink 30, a circuit board 40, and a cover member 50. The case member 10 has a structure (not shown) for being fixed to the instrument panel C1. The case member 10 is divided into an upper and lower part, and has an upper case (upper case member) 60 and a lower case (lower case member) 70.

[0021] The upper case 60 is formed in a box shape that is open downward, with an upper case upper surface 61 as the top surface and an upper case side surface 62 as the side surface. The upper case 60 has a transmission section 63, a first upper inlet (first inlet) 64, a first outlet 65, a storage section 66, an upper case flow path section 67, a second upper inlet (second inlet) 68, and a second outlet 69.

[0022] The upper case top surface 61 is formed in a rectangular shape, is positioned at the position of the hole C11, and is exposed through the hole C11. The upper case side surfaces 62 are walls extending downward approximately perpendicularly from the four sides of the periphery of the upper case top surface 61. The transmitting portion 63 is made of a light-transmitting synthetic resin and is formed in a plate shape so as to fill the opening 61a, which is a rectangular hole formed in the upper case top surface 61. The opening 61a is formed in a position close to the rear end in the front-to-rear direction of the upper case top surface 61.

[0023] The first upper inlet 64 is a rectangular notch cut out from a portion of the rear upper case side surface 62, and is formed in a position facing the first duct C31. The first upper inlet 64 is formed in a position close to the left end in the left-right direction of the upper case side surface 62. The first outlets 65 are twelve rectangular holes formed by dividing a portion of the upper case top surface 61 into a lattice pattern, and are formed in a position close to the front end of the upper case top surface 61 on the opposite side from the opening 61a. Three holes form one group of the first outlets 65, for a total of four groups of holes.

[0024] The accommodation section 66 is formed in the shape of a hollow rectangular cylinder that protrudes downward, and accommodates and fixes the display unit 20, the heat sink 30, and the circuit board 40. The accommodation section 66 is formed in a position facing the transmissive section 63. The upper case flow path section 67 is formed in the shape of a hollow rectangular cylinder that protrudes downward. The upper case flow path section 67 is formed in a position facing the first outlet 65. The upper case flow path section 67 has three first outlet partition walls 67a. The first outlet partition walls 67a divide the upper case flow path section 67 into four sections corresponding to the four groups of holes of the first outlet 65, as shown by the hatching in FIG. 6.

[0025] 2 and 4, the second upper inlet 68 is a rectangular notch cut out of a portion of the rear upper case side surface 62, and is formed in a position facing the third duct C4. The second upper inlet 68 is formed in a position immediately to the right of the first upper inlet 64 in the left-right direction of the upper case side surface 62. The second outlet 69 is a rectangular notch cut out of a portion of the rear upper case side surface 62, and is formed in a position facing the fourth duct C5. The second outlet 69 is formed in a position toward the right end of the upper case side surface 62, opposite the first upper inlet 64 and the second upper inlet 68 in the left-right direction.

[0026] The lower case 70 is formed in the shape of a box that is open at the top, with a lower case lower surface 71 as the bottom surface and a lower case side surface 72 as the side surface. The lower case 70 has a first lower entrance (first entrance) 73.

[0027] The lower case lower surface 71 is formed in a rectangular shape. The lower case side surface 72 is a wall extending upward approximately perpendicularly from the four sides of the periphery of the lower case lower surface 71. The first lower inlet 73 is a rectangular cutout formed by cutting out a portion of the rear lower case side surface 72, and is formed in a position facing the first duct C31. The first lower inlet 73 is formed in a position closer to the left end in the left-right direction of the lower case side surface 72. As shown in Figures 2 and 5, the first lower inlet 73 is formed in a position facing the first upper inlet 64, and is joined with the first upper inlet 64 to form a single hole.

[0028] The display unit 20 comprises a liquid crystal display element and a light source substrate housed in a metal body. The liquid crystal display element is, for example, a TFT (Thin Film Transistor) type liquid crystal display panel formed by sealing liquid crystal molecules between a pair of glass substrates, and displays an image on an upper display surface 20a. In the display unit 20, the display surface 20a of the liquid crystal display element is disposed in a position facing the transmissive portion 63. The light source substrate is, for example, a substrate equipped with LEDs (Light Emitting Diodes) that illuminate the liquid crystal display element, and serves as a backlight for the liquid crystal display element. The light source substrate is disposed below the liquid crystal display element and is a heat generating body that generates heat at a temperature above room temperature.

[0029] The LEDs are arranged on the light source substrate below the entire surface of the liquid crystal display element so that the LED light can be distributed over the entire surface of the liquid crystal display element. Therefore, the light source substrate becomes a heat-generating body that generates high heat, from room temperature to approximately 80°C. Therefore, the light source substrate requires a heat dissipation means. The display unit 20 has necessary optical components, such as a diffuser, between the liquid crystal display panel and the light source substrate. The display unit 20 is connected to the circuit board 40 by a flexible printed circuit board 21.

[0030] 3, 4, and 6, the heat sink 30 is made of, for example, a metal (magnesium alloy or aluminum) or a synthetic resin with high thermal conductivity, and is formed in a substantially rectangular parallelepiped shape. The heat sink 30 is placed in the housing portion 66 of the display unit 20. The heat sink 30 has a display housing portion 31, a circuit board housing portion 32, and a second flow path portion 33.

[0031] The display housing portion 31 is a portion formed above the heat sink 30, covers the display unit 20 except for the display surface, and supports and fixes the display unit 20 with screws or the like.

[0032] The circuit board accommodating portion 32 is formed below the heat sink 30 and between the heat sink 30 and the cover member 50, and is formed by a frame-shaped outer peripheral wall 32a, and supports and fixes the circuit board 40 inside the outer peripheral wall 32a. As shown by the hatching in Fig. 6, the outer peripheral wall 32a is a protruding wall that rises substantially vertically downward along the outer edge of the circuit board 40 except for the area where the circuit board 40 is disposed, and separates the second flow path portion 33 and the circuit board 40. The outer peripheral wall 32a is located near the rear upper case side surface 62 and at a substantially central position in the left-right direction of the rear upper case side surface 62.

[0033] The second flow path portion 33 is formed below the heat sink 30 and between the heat sink 30 and the cover member 50, and is formed in a duct shape (tube shape) by the outer peripheral wall 32a, the heat dissipation fins 33a, and the cover member 50, connecting the first upper inlet 64, the second upper inlet 68, and the second outlet 69. The second flow path portion 33 directs the air that has flowed into the display device 1 from the first upper inlet 64 and the second upper inlet 68 to the second outlet 69.

[0034] 6, the heat dissipation fins 33a are formed in an area other than the circuit board accommodating portion 32 and are protruding walls that rise downward approximately vertically. The heat dissipation fins 33a extend along the outer edges of three sides of the circuit board 40 other than the side facing the rear upper case side surface 62. The heat dissipation fins 33a extend from the rear to the front on the left side of the circuit board 40, which is the side of the first upper entrance 64 and the second upper entrance 68, then extend from the left to the right on the front side of the circuit board 40, and finally extend from the rear to the front on the right side of the circuit board 40, which is the side of the second exit 69.

[0035] For example, two heat dissipation fins 33a are formed at a predetermined interval in a direction away from the outer edge of the outer peripheral wall 32a. As a result, the second flow path portion 33 has one flow path formed by the outer peripheral wall 32a, one heat dissipation fin 33a, and the cover member 50, and another flow path formed by two heat dissipation fins 33a and the cover member 50, for a total of two (plural) flow paths.

[0036] The second flow path section 33 has two separation fins 33b. The separation fins 33b are protruding walls that rise downward approximately vertically. The separation fins 33b are formed on the left side of the circuit board 40, extending from rear to front. One separation fin 33b is formed near each of the first upper inlet 64 and the second upper inlet 68. The separation fins 33b separate the air that flows in from the first upper inlet 64 and the second upper inlet 68 in the left-right direction, and send the air to each of the two flow paths of the second flow path section 33.

[0037] The circuit board 40 is fixed to the circuit board accommodating portion 32 with screws or the like so that it is approximately parallel to the display unit 20. The circuit board 40 mainly has a control unit for controlling the display unit 20. The control unit has a CPU (Central Processing Unit), ROM (Read Only Memory), RAM (Random Access Memory), etc., and executes predetermined arithmetic processing according to a program written in the ROM, for example.

[0038] The control unit acquires, for example, vehicle speed, engine RPM, various vehicle information, navigation information, etc. from the vehicle's ECU (Electronic Control Unit) via various sensors. Based on the acquired information, the control unit displays image information on the display unit 20. The control unit is an IC chip 41 known as a GDC (Graphics Display Controller) that controls the display unit 20, and is a heat-generating element that generates relatively high heat from room temperature to less than approximately 80°C. For this reason, the circuit board 40 requires heat dissipation means. The IC chip 41 is mounted on the surface of the circuit board 40 facing upward.

[0039] The cover member 50 is made of, for example, a metal (such as a magnesium alloy or aluminum) or a synthetic resin having high thermal conductivity, and is formed in a substantially flat plate shape. The cover member 50 has a flat plate portion 51, a first flow path portion (first flow path) 52, and a separation portion 53.

[0040] The flat plate portion 51 is formed in a substantially flat plate shape. The flat plate portion 51 abuts against the storage portion 66 to seal the storage portion 66 from the outside, thereby preventing the air flowing through the first flow path portion 52 from entering the storage portion 66.

[0041] The flat plate portion 51 abuts against the outer peripheral wall 32a to seal the circuit board accommodating portion 32 from the outside, thereby preventing air flowing through the first flow path portion 52 and the second flow path portion 33 from entering the circuit board accommodating portion 32. In this way, the display device 1 has air flow paths formed to be isolated from the circuit board 40, making it unnecessary to take measures against moisture for the circuit board 40. Specifically, the display device 1 does not require the application of a moisture-resistant coating to the circuit board 40 or the placement of a porous film or the like that allows air to pass through but not moisture, thereby reducing the manufacturing process and manufacturing costs.

[0042] The flat plate portion 51 abuts against the heat dissipation fins 33a, the separation fins 33b, and the outer peripheral wall 32a, sealing the second flow path portion 33 from the outside, thereby preventing air flowing through the second flow path portion 33 from leaking into the circuit board accommodating portion 32, etc. The display device 1 can efficiently dissipate heat generated from the display unit 20 by air flowing through the second flow path portion 33 via the heat dissipation fins 33a and the outer peripheral wall 32a. The display device 1 can guide the air that flows in from the first upper inlet 64 and the second upper inlet 68 and flows through the second flow path portion 33 to the second outlet 69 without leakage.

[0043] The flat plate portion 51 abuts against the circuit board 40 via the heat transfer sheet 80. The heat transfer sheet 80 faces the IC chip 41 and is attached to the circuit board 40 at a position facing the first flow path portion 52. The display device 1 can dissipate heat from the IC chip 41 through the cover member 50.

[0044] 3 and 7, the first flow path portion 52 is formed by the flat plate portion 51, the first flow path wall 52a, and the lower case lower surface 71, and is formed in a duct shape (tube shape) by the flat plate portion 51 and the lower case lower surface 71 connecting the first lower inlet 73 and the first outlet 65, and causes air that has flowed into the display device 1 from the first lower inlet 73 to flow to the first outlet 65. The first flow path wall 52a is a protruding wall that rises substantially vertically downward (towards the lower case lower surface 71) from the flat plate portion 51, as shown by hatching in FIG. 7. The first flow path wall 52a is formed to extend from the first lower inlet 73 side to the first outlet 65 side.

[0045] 7, the first flow path portion 52 has a first flow path partition wall 52b. The first flow path partition wall 52b is a protruding wall that rises substantially vertically downward (toward the lower case lower surface 71) from the flat plate portion 51. The first flow path partition wall 52b is formed to extend from the first lower inlet 73 side to the first outlet 65 side.

[0046] Three first flow path partition walls 52b are formed to divide the first flow path section 52 into four sections corresponding to the four groups of holes in the first outlet 65 described above. The first lower inlet 73 side of the first flow path partition wall 52b is formed with a gap between it and the first lower inlet 73, and separates the air that flows in from the first lower inlet 73 into four (plural) sections and sends them to the four flow paths of the first flow path section 52. The first outlet 65 side of the first flow path partition wall 52b is formed opposite the first outlet partition wall 67a.

[0047] Of the four separated first flow path sections 52, one flow path is formed in a position facing the heat transfer sheet 80 and the IC chip 41. This allows the air flowing through the first flow path section 52 to dissipate heat from the IC chip 41.

[0048] The separation section 53 is a section formed near the first upper inlet 64 and the first lower inlet 73 of the flat plate section 51. The separation section 53 separates the air flowing in from the first duct C31 into upper and lower air, and sends the air to the first flow path section 52 and the second flow path section 33.

[0049] The first duct C31, the third duct C4, and the fourth duct C5 are connected to the first upper inlet 64, the first lower inlet 73, the second upper inlet 68, and the second outlet 69, respectively, via gaskets 90 so as to prevent air leakage.

[0050] 5, 6, and 7, the first duct C31 forcibly sends air blown from the automobile to the first flow path portion 52 and the second flow path portion 33. The air flowing through the first flow path portion 52 is divided into four flow paths, then passes through the upper case flow path portion 67, is discharged from the first outlet 65, and is blown onto the front windshield C2. The air flowing through one of the first flow path portions 52 absorbs heat from the circuit board 40 along the way.

[0051] The air flowing through the second flow path section 33 is divided into two flow paths, then absorbs heat from the display unit 20 along the way, and then flows into the fourth duct C5 from the second upper inlet 68 and is released toward the driver's feet.

[0052] The third duct C4 forcibly sends air blown from the vehicle to the second flow path section 33. The air flowing through the second flow path section 33 is divided into two flow paths, and then absorbs heat from the display unit 20 along the way, before flowing into the fourth duct C5 from the second upper inlet 68 and being released toward the driver's feet.

[0053] By forming it in this manner, it is possible to provide a display device that can cool the display unit 1 and also function as a defroster device.

[0054] Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, and are also included in the scope of the invention and its equivalents as defined in the claims.

[0055] For example, the first flow path wall 52a forming the first flow path portion 52 was formed on the flat plate portion 51, but may be formed on the lower case 70. Also, the first flow path partition wall 52b was formed on the flat plate portion 51, but may be formed on the lower case 70.

[0056] Furthermore, although the outer peripheral wall 32a forming the circuit board accommodating portion 32 was formed on the heat sink 30, it may be formed on the cover member 50. Furthermore, although the heat dissipation fins 33a were formed on the heat sink 30, they may be formed on the cover member 50.

[0057] Furthermore, although the first outlet 65 is exposed from the hole C11, it may be hidden by an instrument panel C1 disposed above the first outlet 65. In this case, the air discharged from the first outlet 65 may be blown onto the front windshield C2 through a defroster hole provided in the instrument panel C1.

[0058] Furthermore, although the fourth duct C5 was provided, this may be eliminated and a duct portion shaped to discharge air downward from the display device may be provided in the upper case 60. [Explanation of symbols]

[0059] C1 instrument panel C11 hole C12 Defroster hole C2 front windshield C21 Masking section C3 Defroster Duct C31 First Duct C32 Second Duct C4 Third Duct C5 4th Duct V Virtual Image 1 Display 10 Case material 20 Display unit (display section) 20a Display surface 21 Flexible printed circuit board 30 Heat sink (inner case component) 31 Display housing 32 Circuit board housing 32a outer wall 33 Second flow path section 33a Heat dissipation fin 33b Separated fin 40 Circuit Board 41 IC chip 50 Cover member 51 Flat plate part 52 first flow path section (first flow path) 52a First channel wall 52b First flow path partition wall 53 Separation part 60 Upper case (upper case member) 61 Top of the upper case 61a aperture 62 Upper case side 63 Transparent part 64 First Upper Entrance (First Entrance) 65 Exit 1 66 Storage unit 67 Upper case flow path 67a First Exit Partition Wall 68 Second Upper Entrance (Second Entrance) 69 Second Exit 70 Lower case (lower case component) 71 Bottom of the lower case 72 Lower case side 73 First Lower Entrance (First Entrance) 80 Heat transfer sheet 90 Gasket

Claims

1. A display unit; a circuit board disposed below the display unit and controlling the display unit; an inner case member disposed below the display unit and holding the display unit; a cover member disposed below the middle case member and covering the lower part of the middle case member; an upper case member having a transparent portion that covers the display unit from above and makes the display unit visible; and a lower case member that houses the display unit, the circuit board, the middle case member, and the cover member together with the upper case member, the case member has a first inlet connected to a defroster duct of a vehicle for allowing air to flow into the case member, and a first outlet for allowing the air to flow out of the case member, a first flow path that allows the air to flow from the first inlet to the first outlet is formed by the cover member and the lower case member; the transmission portion is formed on an instrument panel of the vehicle at a position facing a front windshield of the vehicle, The display device, wherein the first outlet is formed at a position between the front windshield and the transmission portion.

2. the case member has a second outlet through which the air flows out to the outside, 2. The display device according to claim 1, wherein the middle case member and the cover member form a second flow path for causing the air to flow from the first inlet to the second outlet.

3. 3. The display device according to claim 2, wherein the cover member has a separating portion that separates the air into the first flow path and the second flow path.

4. the circuit board is disposed below the middle case member and covered by the cover member; 3. The display device according to claim 2, wherein the middle case member has a partition wall that rises approximately vertically downward along the outer edge of the circuit board other than the area in which the circuit board is placed, and that separates the second flow path from the circuit board.

5. 5. The display device according to claim 4, wherein the cover member abuts against the circuit board at a position facing the first flow path.

6. the case member has a second inlet through which air flows from the vehicle into the interior; 3. The display device according to claim 2, wherein the second flow path allows the air that has flowed in from the second inlet to flow to the second outlet.

7. The display device according to claim 1 , wherein the first outlet is formed at a position adjacent to the transmissive portion of the upper case member.

8. The first outlet has a plurality of outlets, 2. The display device according to claim 1, wherein the first flow path includes a plurality of first flow paths formed for each of a plurality of the first outlets.

9. 7. The display device according to claim 6, wherein the second inlet and the second outlet are connected to a duct other than the defroster duct.

Images