JP2022153739A - Display device - Google Patents

Abstract

To provide a display device that can improve the degree of freedom in design.SOLUTION: A display device 1 in one embodiment includes a mask 15 disposed on a front side, a lower case disposed on a rear surface side opposite to the front side, middle cases 25 and 30 that support an internal structure between the mask 15 and the lower case, a segment circuit board 70 that is fixed to the mask 15 more on the rear surface side than the middle cases 25 and 30, and a TFT circuit board 60 fixed to the lower case more on the rear surface side than the middle cases 25 and 30. The middle cases 25 and 30 include an upper temporarily fixing piece 24 and a lower temporarily fixing piece 34 that temporarily fix the TFT circuit board 60 to the middle cases 25 and 30 in the case where the segment circuit board 70 is fixed to the mask 15.SELECTED DRAWING: Figure 4

Description

The present disclosure relates to a display device mounted on a vehicle or the like.

2. Description of the Related Art A known display device mounted on a vehicle or the like has two circuit boards electrically connected to each other. For example, Patent Literature 1 discloses a display device in which circuit boards are arranged so as to overlap each other in the front-rear direction.

Japanese Patent Application Laid-Open No. 2018-122800

A display device is mounted in an instrument panel of a vehicle or the like. The storage space for the display device may be limited in consideration of other vehicle components. As in the display device described above, if the circuit boards overlap in the front-rear direction, the thickness of the display device increases.

The present disclosure has been made in consideration of such circumstances, and an object thereof is to provide a display device capable of improving the degree of freedom in design.

In order to solve the above-described problems, the display device of the present disclosure has an upper case arranged on the front side, a lower case arranged on the back side opposite to the front side, and between the upper case and the lower case. a first board fixed to the upper case on the back side of the middle case; and a second board fixed to the bottom case on the back side of the middle case. a substrate, wherein the middle case has a temporary fixing portion that temporarily fixes the second substrate to the middle case when the first substrate is fixed to the upper case.

In the display device of the present disclosure, it is possible to improve the degree of freedom in design.

1 is a perspective view showing a display device, which is an embodiment of the display device of the present disclosure, from the front side; FIG. FIG. 2 is a front view of the display device with the illustration of a mask omitted; Rear view of the display device. FIG. 3 is a perspective view showing the display device from the rear side, with the lower case omitted. Sectional drawing which follows the VV line of FIG. The perspective view which shows an upper middle case from the front side. The perspective view which shows a right inside case from the front side. The perspective view which shows a right inside case from a back side.

An embodiment of the display device 1 of the present disclosure will be described based on the accompanying drawings. The display device 1 of the present disclosure is mounted, for example, on vehicles such as automobiles and motorcycles, ships, agricultural machines, and construction machines.

FIG. 1 is a perspective view showing from the front side a display device 1 that is an embodiment of the display device 1 of the present disclosure.
FIG. 2 is a front view of the display device 1 with the mask 15 omitted.
FIG. 3 is a rear view of the display device 1. FIG.
FIG. 4 is a perspective view showing the display device 1 from the rear side, with the lower case 11 omitted.
5 is a cross-sectional view taken along line VV of FIG. 4. FIG.

In the following description, "front (front)", "back (back)", "upper", "lower", "right", and "left" are defined as "Fr." Re.", "To.", "Bo.", "R", and "L". The side where the display device 1 is visually recognized by the user is defined as "front".

The display device 1 includes a TFT display section 2, a segment display section 3 arranged above the TFT display section 2, and warning light display sections 4 arranged to the left and right of the TFT display section 2 when viewed from the front. and have The TFT display unit 2 displays various information such as car navigation information on a dot matrix type (TFT type) liquid crystal display panel. The segment display unit 3 displays the vehicle speed on a segment type liquid crystal display panel. The warning light display unit 4 displays various warning lights by turning on the light source 71 .

The display device 1 includes a case 10, a TFT display unit 40 (display unit), a segment display unit 50, a TFT circuit board 60 (second board), and a segment circuit board 70 (first board). , mainly has

The case 10 has a lower case 11 , a mask 15 (upper case), and a middle case 20 .

The lower case 11 is arranged on the back side of the display device 1 and is made of light-blocking resin (for example, white polypropylene). The lower case 11 is a box-shaped member that forms the back surface of the display device 1 and the side surfaces along the front-rear direction and is open at the front. The lower case 11 mainly accommodates the middle case 20, the TFT display unit 40, the segment display unit 50, the segment circuit board 70, and the TFT circuit board 60 in an internal space. As shown in FIG. 3, the lower case 11 has four screw holes 12 for screwing with the TFT circuit board 60 . The lower case 11 also has four screw holes 13 for screwing with the segment circuit board 70 .

The mask 15 is a light-shielding resin (for example, black ABS resin) arranged on the front side of the display device 1 . The mask 15 covers areas other than the TFT display section 2 and the warning light display section 4 and the inside of the case 10 to be shielded from the user from the front. The mask 15 has a flange portion (not shown), which is combined with the lower case 11 on the front edge 11a side of the lower case 11 so as to function as a front outer shell of the display device 1 . The mask 15 has four cylindrical bosses 16 for screwing with the segment circuit board 70 .

The middle case 20 supports internal structures such as the TFT display unit 40 , the segment display unit 50 , the TFT circuit board 60 and the segment circuit board 70 between the mask 15 and the lower case 11 . The middle case 20 is a light-shielding resin (for example, white polypropylene). The middle case 20 has an upper middle case 21 , a left middle case 25 and a right middle case 31 . Here, FIG. 6 is a perspective view showing the upper and middle case 21 from the front side. FIG. 7 is a perspective view showing the right middle case 31 from the front side. FIG. 8 is a perspective view showing the right middle case 31 from the rear side.

The upper middle case 21 is arranged above the display device 1 and mainly supports the segment display unit 50 . The upper and middle case 21 has an accommodating portion 22 , a screw hole 23 and an upper temporary fixing piece 24 . The housing portion 22 is a box-shaped member that forms a space for housing the segment display unit 50 . The screw holes 23 are arranged in two piece-shaped members projecting downward from the left end and right end of the lower side 22 a of the accommodating portion 22 . The screw holes 23 are holes for screwing with the segment circuit board 70 . The upper temporary fixing piece 24 (temporary fixing portion) is arranged at the tip of the piece member. During assembly of the display device 1, the upper temporary fixing piece 24 holds the TFT circuit board 60 in the middle until the TFT circuit board 60 is fully fixed after the segment circuit board 70 is fixed to the mask 15. Temporarily fixed to the case 20 . Specifically, the upper temporary fixing piece 24 is a small piece that supports the TFT circuit board 60 forward from the rear surface 60a in order to restrict the backward movement of the TFT circuit board 60. As shown in FIG. The upper temporary fixing piece 24 is an L-shaped portion having an upper wall 24a extending substantially vertically rearward and a rear wall 24b extending substantially vertically downward.

The left middle case 25 and the right middle case 31 are arranged on the left and right sides of the display device 1, respectively, and serve mainly as lighting cases for warning lights. The left middle case 25 and the right middle case 31 have illumination portions 26, 36, bosses 30, 33, and positioning pins 37, 38, as shown in FIGS. The right middle case 31 further has a lower temporary fixing piece 34 (temporary fixing portion).

The lighting units 26 and 36 are cylindrical portions corresponding to the number of warning lights. The illumination portions 26, 36 have rear open ends 26a, 36a and front open ends 26b, 36b. The rear open ends 26a and 36a are open ends located in front of the light source 71 of the segment circuit board 70, and allow the light from the light source 71 to enter. The front open ends 26b, 36b are open ends located forward of the rear open ends 26a, 36a, and allow the light from the light source 71 to exit therefrom. A dial 27 and a lens 28 are arranged in front of the left inner case 25 and the right inner case 31 (FIG. 5). The dial 27 has, for example, a warning light design 29 (FIG. 1) printed in black in white, and the light from the light source 71 is transmitted through this design portion. The lens 28 covers the opening 15a of the mask 15 and transmits the light that has passed through the dial 27. As shown in FIG. As a result, the display device 1 displays a warning light on the warning light display section 4 .

The bosses 30 and 33 are arranged on strip-like members projecting downward from the lower ends of the illumination portions 26 and 36 . The bosses 30 and 33 are arranged below the illumination portions 26 and 36 and are provided for screwing with the segment circuit board 70 .

The positioning pin 37 is a pin that is arranged above the left inner case 25 and the right inner case 31, to the left of the lighting section 26 and to the right (outside) of the lighting section 36, and protrudes rearward. The positioning pins 37 serve to position the segment circuit board 70 when the segment circuit board 70 is screwed to the mask 15 when the display device 1 is assembled. The positioning pin 38 is a pin that is arranged below the illumination portion 36 of the right middle case 31 and protrudes rearward. The positioning pins 38 , like the positioning pins 37 , serve to position the segment circuit board 70 when screwing the segment circuit board 70 to the mask 15 during assembly of the display device 1 .

The lower temporary fixing piece 34 is arranged at the tip of the piece-shaped member. During assembly of the display device 1, the lower temporary fixing piece 34 holds the TFT circuit board 60 in the middle until the TFT circuit board 60 is permanently fixed after the segment circuit board 70 is fixed to the mask 15. Temporarily fixed to the case 20 . Specifically, the lower temporary fixing piece 34 is a small piece that supports the TFT circuit board 60 forward from the rear surface 60a in order to restrict the backward movement of the TFT circuit board 60. As shown in FIG. The lower temporary fixing piece 34 is arranged toward the inside (left side) of the display device 1 from the left side of the piece member, and includes a right wall 34a extending substantially vertically rearward and a rear wall 34b extending substantially vertically leftward. is an L-shaped portion having . The lower temporary fixing piece 34 has a cable guide rib 34c projecting rightward from the right wall 34a.

The TFT display unit 40 displays various information as the TFT display section 2 . The TFT display unit 40 has a display panel and a backlight unit.

The display panel is, for example, a TFT (Thin Film Transistor) type liquid crystal display panel. The display panel has a pair of glass substrates enclosing a liquid crystal layer. Transparent electrodes of ITO (Indium Tin Oxide) or the like are formed on the pair of glass substrates. The display panel also has a pair of polarizing plates (polarizing filters) arranged to sandwich the pair of glass substrates. The display panel is connected to the TFT circuit board 60 via a flexible printed circuit board (FPC (Flexible Printed Circuits)) not shown. The display panel is controlled by the control section of the TFT circuit board 60, and a drive voltage is applied to the liquid crystal layer through the transparent electrodes. As a result, the orientation of the liquid crystal molecules in the liquid crystal layer is controlled, and the transmittance of each pixel of the display panel is changed, whereby the display panel displays an image.

The backlight unit is provided behind the display panel. The backlight unit consists of a light source substrate and a light guide member, and illuminates the display panel from behind. The light source substrate mounts a plurality of LEDs (Light Emitting Diodes), which is an example of a light source. The light source substrate is connected to the TFT circuit substrate 60 via a flexible substrate such as FPC. When a drive current is supplied to the LED, the LED emits light toward the light guide member. The light guide member guides the light emitted by the LED toward the display panel.

The segment display unit 50 displays the vehicle speed as the segment display section 3 . The segment display unit 50 is substantially the same as the TFT display unit 40 except that the driving method is segment. The segment display unit 50 is illuminated from behind by a light source (not shown) mounted on the circuit board and a light guide (not shown) arranged in the housing portion 22 .

The TFT circuit board 60 is arranged on the back side of the middle case 20 and between the TFT display unit 40 and the lower case 11 . The TFT circuit board 60 mainly has a control section for controlling the TFT display unit 40 .

The control unit has a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), etc., and executes predetermined arithmetic processing according to a program written in the ROM, for example. The control unit acquires, for example, vehicle speed, engine speed, various vehicle information, navigation information, and the like from an ECU (Electronic Control Unit) of the vehicle via various sensors and the like. The control unit causes the display unit to display information based on the acquired information.

The TFT circuit board 60 has screw holes 62 for screwing to the lower case 11 at four locations corresponding to the screw holes 12 of the lower case 11 . Unlike the segment circuit board 70 , the TFT circuit board 60 does not face the mask 15 and cannot be fixed to the mask 15 .

Further, the TFT circuit board 60 has a communication unit 64 for wireless communication on the rear surface 60a. The communication unit 64 communicates between a communication terminal such as a smart phone and the display device 1 using Bluetooth (registered trademark).

The segment circuit board 70 is fixed by being screwed to the mask 15 on the back side of the middle case 20 . The segment circuit board 70 mainly has a control section for controlling the segment display unit 50 and the light source 71 for lighting the warning light. The control section is substantially the same as the control section of the TFT display unit 40 except that the control target is different. The segment circuit board 70 has a light source 71 for lighting a warning light. The light source 71 is, for example, a top-view type (top emission type) LED arranged on the front surface of the segment circuit board 70 . A plurality of light sources 71 are provided corresponding to the number of warning lights.

The segment circuit board 70 has holes 74 and cutouts 75 at positions corresponding to the positioning pins 37 and 38 of the right middle case 31 to fit the positioning pins 37 and 38 . The segment circuit board 70 also has screw holes 72 at four locations corresponding to the bosses 16 of the mask 15 to be screwed to the mask 15 . The segment circuit board 70 has a shape that does not interfere with the upper temporary fixing piece 24 and the lower temporary fixing piece 34 protruding rearward.

The TFT circuit board 60 and the segment circuit board 70 are grounded by being connected to each other by four cables 80 at the rear surfaces 60a, 70a. As shown in FIG. 4 , one end of each of the four cables 80 is connected to the TFT circuit board 60 at four corners of the substantially rectangular TFT circuit board 60 . Each other end of the cable 80 is connected to the segment circuit board 70 at a predetermined position of the segment circuit board 70 located outside the four corners of the TFT circuit board 60 in the left-right direction.

At this time, the upper two cables 80 are guided and routed along the upper sides of the upper temporary fixing pieces 24 protruding rearward from the TFT circuit board 60 . The cable 80 located below and to the right is guided to the lower side of the lower temporary fixing piece 34 protruding rearward from the TFT circuit board 60, and is guided so as to be sandwiched between the positioning pin 38 and the cable guide rib 34c. are wired together. Thus, the upper temporary fixing piece 24 and the lower temporary fixing piece 34 have a function of temporarily fixing the TFT circuit board 60 and a function of guiding the wiring of the cable 80 (guide portion).

Here, in the display device 1, the TFT circuit board 60 and the segment circuit board 70 are arranged behind the middle case 20 so that they do not overlap in the front-rear direction. As a result, the display device 1 can be made smaller in thickness in the front-rear direction than in the case where the TFT circuit board 60 and the segment circuit board 70 overlap in the front-rear direction, and the degree of freedom in design can be improved.

On the other hand, since the TFT circuit board 60 is arranged behind the TFT display unit 40 , unlike the segment circuit board 70 , it cannot be screwed to the mask 15 , so it is screwed to the lower case 11 . When the display device 1 is assembled, the TFT circuit board 60 is covered with the lower case 11 and screwed so that the position of the TFT circuit board 60 cannot be visually recognized. Therefore, whether or not the TFT circuit board 60 is displaced from an appropriate position is determined by whether or not the screw 85 can be inserted into the screw hole 62 of the TFT circuit board 60 when screwing from the screw hole 12 of the lower case 11 . It can only be confirmed by

In contrast, in the display device 1 of the present embodiment, the TFT circuit board 60 is temporarily fixed by providing the upper temporary fixing piece 24 and the lower temporary fixing piece 34 to the middle case 20, thereby improving workability during assembly. Thus, even if the TFT circuit board 60 and the segment circuit board 70 are arranged so as not to overlap each other, the assembling workability is not impaired. The operation of assembling the display device 1 will be specifically described below.

First, the TFT display unit 40 is assembled to the TFT circuit board 60 . One end of a cable 80 is connected to the TFT display unit 40 with a screw 81 (the integrated TFT circuit board 60 and TFT display unit 40 are hereinafter referred to as "TFT unit"). Next, the segment display unit 50, the left middle case 25, and the right middle case 31 assembled to the upper middle case 21 are assembled to the segment circuit board 70 with screws 82 (hereafter, integrated middle case 20, segment The display unit 50 for segment and the circuit board 70 for segment are called "segment unit".).

Next, TFT units are arranged on the mask 15 . A segment unit is arranged on the mask 15 . After that, the segment circuit board 70 is fixed to the left middle case 25 and the right middle case 31 with screws 83 . At the same time, the other end of cable 80 is also connected to segment circuit board 70 with screw 83 . Next, the segment unit is fixed to the mask 15 with screws 84 .

At this time, the TFT unit is inserted and arranged in the gap between the rear wall 24b of the upper temporary fixing piece 24 and the rear wall 34b of the lower temporary fixing piece 34, and the TFT display unit 40. FIG. As a result, the rear wall 34b restricts the TFT unit from moving rearward. Further, the TFT unit is restricted from moving upward by the upper walls 24 a of the upper temporary fixing pieces 24 . Furthermore, the rightward movement of the TFT unit is restricted by the right wall 34a of the lower temporary fixing piece 34. As shown in FIG.

In this state, the lower case 11 is assembled to the mask 15 so as to fit with the outer edge of the mask 15 . Thereafter, the TFT unit (TFT circuit board 60) is fixed (finally fixed) by screwing the lower case 11 and the TFT unit with screws 85 through the screw holes 12 and 62 from the rear surface of the lower case 11. be. At this time, the TFT unit is temporarily fixed by the upper temporary fixing piece 24 and the lower temporary fixing piece 34, so that the state in which the TFT unit is arranged at an appropriate position can be maintained. Therefore, even if the operator cannot visually recognize the TFT unit when screwing, the screwing operation can be preferably performed. Finally, the segment unit fixed to the lower case 11 and the mask 15 is fixed with screws 86 through the bosses 16 and the screw holes 72 from the rear surface of the lower case 11 .

As described above, the display device 1 according to the present embodiment can be preferably assembled even when a plurality of circuit boards are arranged without overlapping each other in the front-rear direction and fixed to different positions. As a result, the display device 1 can arrange the TFT circuit board 60 and the segment circuit board 70 at desired positions without being restricted by where screws are fixed, thereby improving the degree of freedom in design.

While several embodiments of the invention have been described, these embodiments have been presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the scope of the invention described in the claims and equivalents thereof.

For example, the arrangement and shape of the TFT circuit board 60 (second board) and the segment circuit board 70 (first board) are merely examples, and are not limited to these.

The shape of the upper temporary fixing piece 24 and the lower temporary fixing piece 34 is an example, and may be, for example, a hook shape that engages with the back surface 60 a of the TFT circuit board 60 .

In order to more reliably position and temporarily fix the TFT circuit board 60 , for example, a positioning pin projecting backward toward the TFT circuit board 60 may be provided on the back surface of the TFT display unit 40 .

1 display device 2 TFT display section 3 segment display section 4 warning light display section 10 case 11 lower case 11a front edge 12, 13, 23, 62, 72 screw hole 15 mask (upper case)
15a Opening 15b Rear surface 16, 30, 33 Boss 20 Middle case 21 Upper middle case 22 Housing portion 22a Lower side 24 Upper temporary fixing piece (temporary fixing portion)
24a Upper wall 24b Rear wall 25 Left middle case (middle case)
26, 36 illumination portions 26a, 36a rear opening ends 26b, 36b front opening end 27 dial 28 lens 29 design 31 right middle case (middle case)
34 lower temporary fixing piece (temporary fixing part)
34a right wall 34b rear wall 34c cable guide ribs 37, 38 positioning pin 40 TFT display unit (display unit)
50 segment display unit 60 TFT circuit board (second board)
60a rear surface 64 communication unit 70 segment circuit board (first board)
70a Rear surface 71 Light source 74 Hole 75 Notch 80 Cables 81, 82, 83, 84, 85, 86 Screws

Claims (5)

an upper case arranged on the front side;
a lower case arranged on the back side opposite to the front;
a middle case supporting an internal structure between the upper case and the lower case;
a first substrate fixed to the upper case on the rear surface side of the middle case;
a second substrate fixed to the lower case on the back side of the middle case,
The display device, wherein the middle case has a temporary fixing portion that temporarily fixes the second substrate to the middle case when the first substrate is fixed to the upper case. 2. The display device according to claim 1, wherein the temporary fixing portion is a small piece that supports the second substrate from the back side surface to the front side in order to restrict movement of the second substrate toward the back side. . 2. The display device according to claim 1, wherein said first substrate does not overlap said second substrate in a direction connecting said front surface and said back surface. further comprising a cable connecting the first substrate and the second substrate on the back side surfaces of the first substrate and the second substrate;
2. The display device according to claim 1, wherein said temporary fixing portion also serves as a guide portion for guiding wiring of said cable. further comprising a display unit,
2. The display device according to claim 1, wherein said second substrate is arranged between said display unit and said lower case.

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