JPH10214036A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To hold an LCD cell obliquely on a circuit board without using a package board for the LCD cell. SOLUTION: The LCD cell 1 is fixed to the circuit board 3 by soldering LCD pins 2 and 3 at one end side and the other end side of the LCD cell 1 to the circuit board 4. In this case, the LCD pin 2 is made longer than the LCD pin 3 to hold the LCD cell 1 obliquely on the circuit board 4. When the LCD cell 1 is a transmission type or translucent type, illumination light is emitted from a light guide plate 7 fitted to the circuit board 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device in which a display panel is held inclined with respect to a circuit board, and can be used, for example, as a display device of a vehicle-mounted device in an automatic toll collection system for a toll road.

[0002]

2. Description of the Related Art Conventionally, an on-vehicle device in an automatic toll collection system for a toll road includes a communication unit 10 as shown in FIG.
1. User interface unit 102, IC card unit 1
03, a memory unit 104, a power supply unit 105, and a control unit 106. The communication unit 101 includes an antenna 10 for communicating with a road machine provided at a tollgate on a toll road.
1a and a transmission / reception circuit 101b for controlling communication. The user interface unit 102 is a means for notifying the user of information such as the balance and the abnormality of the vehicle-mounted device, and switches between a display unit 102a for displaying the information and information displayed on the display unit 102a by the user. And a buzzer 102c that generates a buzzer sound to draw the user's attention. The IC card unit 103 includes an IC card 103a that stores information such as a balance, and an IC card interface 103b that controls read / write processing on the IC card 103a. Memory unit 104
Is an EE that records information such as vehicle type in a nonvolatile manner even when the power is turned off.
It is composed of a PROM 104a. The power supply unit 105
It comprises a battery 105a as a power supply and a regulator 105b for regulating the battery. Control unit 1
Reference numeral 06 includes a CPU 106a that controls the above-described components.

[0003] The above-mentioned vehicle-mounted device 100 is, for example, shown in FIG.
As shown in the figure, it is provided inside the windshield. In this case, it is preferable to set the display surface 1021a of the display unit 102a so as to be substantially perpendicular (directly in front) to the line of sight of the user. For this reason, as shown in the external view of FIG. 19, it is necessary to make the display surface 1021 a inclined with respect to the main body of the housing 110 that houses the above components. The in-vehicle device 100 is not limited to the inside of the windshield, but on the dash boat, behind the rearview mirror,
Although it can be provided on a hood outside the vehicle compartment or the like, in any case, the display surface 1021a needs to be inclined with respect to the main body of the housing 110.

[0004] The inventors of the present invention have produced the structure shown in FIG. In FIG. 20, a circuit board 111 for mounting each component except a display unit 102a and a display unit 1 are provided in a resin housing 110.
An LCD mounting substrate 112 for mounting a liquid crystal display panel (hereinafter, referred to as an LCD cell) 113 is mounted as 02a.

[0005] The LCD cell 113 has L as a signal pin.
It is soldered to the LCD mounting substrate 112 by the CD pins 114. The LCD mounting board 112 has a backlight L
The ED 115 and the light guide plate 116 are mounted, and the back surface of the LCD cell 113 is irradiated with illumination light from the light guide plate 116. The LCD mounting board 112 is provided with an LCD fixing screw 11 on an LCD support portion 110a integrally formed with the housing 110.
7. Further, the circuit board 111 is fixed by a main board supporting portion 118 integrally formed with the housing 110.

[0006] Flat wire connectors 119 and 120 are attached to the LCD mounting board 112 and the circuit board 111, and signals are transmitted between the LCD mounting board 112 and the circuit board 111 by the flat wires 121.
According to the above configuration, the LCD cell 113 is connected to the circuit board 1
11 can be held at a predetermined angle with respect to 11, so that the display surface of the LCD cell 113 can be inclined with respect to the mounting surface of the vehicle-mounted device 100 even when the vehicle-mounted device 100 is mounted inside the windshield or the like.

[0007]

However, in the above-described configuration, the LCD mounting board 112 is required,
Since the flat wire 121 is used for the interface between the mounting board 112 and the circuit board 111, there is a problem that it takes time and labor during assembly and the production efficiency is poor. Also,
The use of the flat wire 121 may cause a problem such as a contact failure due to an assembly error or a contact failure due to disconnection or looseness due to vibration or the like.

The present invention has been made in view of the above problems, and eliminates the above-described display panel mounting substrate (LCD mounting substrate) and flat wires, and enables the display panel to be held in a state inclined with respect to the circuit substrate. The purpose is to:

[0009]

In order to achieve the above object, according to the first aspect of the present invention, the signal pin (2) on one end of the display panel (1) is replaced with the signal pin (3) on the other end. The display panel (1) is held inclined with respect to the circuit board (4) by making the signal pin (2) on one end side and the signal pin (3) on the other end side attached to the circuit board (4). It is characterized by doing so.

Therefore, the display panel (1) is directly attached to the circuit board (4) by using the signal pins (2, 3) at one end and the other end, so that the display required in the conventional type is required. A configuration in which the mounting substrate of the panel and the flat wire are eliminated can be obtained. Further, since the signal pin (2) at one end is longer than the signal pin (3) at the other end, the display panel can be held in a state inclined with respect to the circuit board.

In this case, the signal pins (2, 3) at one end and the other end are bent to a predetermined mounting angle with respect to the circuit board (4). Can be set to Further, the display panel (1) can be formed at a desired height by including a signal pin having a shape defining a mounting height to the circuit board (4). It can be attached to (4).

According to the present invention, the light from the light sources (8, 10) attached to the circuit board (4) is transmitted through the light guide plates (7, 9) to the display panel (1). If the light is guided to the back side, the transmission type like a liquid crystal display panel,
An inclined display can be performed on a transflective display panel. According to the fifth aspect of the present invention, the signal pins (2, 3) of the display panel (1) are attached to the circuit board (4), and the display panel (1) is held inclined with respect to the circuit board (4). The light from a light source (8) mounted on a circuit board (4) is transmitted from a light guide plate (7) having a first reflecting surface (72) and a second reflecting surface (73) to a display panel (7). It is characterized in that the back surface of 1) is irradiated by diffusion.

Therefore, according to the present invention, the signal pins (2, 3) of the display panel (1) are directly attached to the circuit board (4). A configuration without the flat wire can be provided. Further, by using the light source (8) and the light guide plate (7) mounted on the circuit board (4), the light source (8) can be tilted with respect to a transmissive or transflective display panel such as a liquid crystal display panel. Display can be performed.

In this case, it is necessary for the light guide plate (7) to appropriately irradiate the light from the light source (8) to the back surface of the inclined display panel (1). For this reason, in the invention according to claim 6, the light guide plate (7) is provided with a diffusion surface (74) for diffusing the light reflected by the second reflection surface (73). Further, in the invention according to claim 7, the first reflecting surface (72) is shaped so as to reflect light from the light source (8) as substantially parallel light in the direction of the second reflecting surface (73). For example, a step shape or a curved surface shape is adopted.

Further, in the invention according to claim 8,
The second reflecting surface (73) is shaped so as to reflect the light reflected by the first reflecting surface (72) while changing the density. For example, a step shape or a curved surface shape is adopted. Claim 9
In the invention described in (1), the second reflecting surface (73) is provided with the first reflecting surface (73).
Light reflected by the reflection surface (72) is diffusely reflected. For example, the shape is such that a stepped uneven portion or a reflecting surface portion is rounded.

According to the present invention, the signal pins (2, 3) of the display panel (1) are attached to the circuit board (4), and the display panel (1) is inclined with respect to the circuit board (4). A light guide plate (9) for irradiating light from a light source (10) mounted on a circuit board (4) to the back surface of the display panel (1). And a diffusion surface (9) on the back surface of the display panel (1).
1) and a reflecting surface (92) for reflecting the direct light emitted from the light source (10). The direct light emitted from the light source (10) is guided to the diffusing surface (91) and the diffusing surface (91). )
The light quantity distribution of the direct light guided to the reflector is adjusted by the light reflected by the reflection surface (92).

Therefore, according to the present invention, the signal pins (2, 3) of the display panel (1) are directly attached to the circuit board (4). A configuration without the flat wire can be provided. Further, by using the light source (10) and the light guide plate (9) mounted on the circuit board (4), the display is performed in an inclined state with respect to a transmissive or transflective display panel such as a liquid crystal display panel. It can be performed.

[0018]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a first embodiment of the present invention. FIG. 1 shows a cross-sectional configuration of the vehicle-mounted device according to the present embodiment. The LCD cell 1 has LCD pins 2 and 3 as signal pins on one end and the other end, respectively. The LCD pin 2 on one end and the LCD pin 3 on the other end are provided.
Is directly soldered to the circuit board 4 to fix the LCD cell 1 to the circuit board 4. In this case, the LCD pin 2 on one end of the LCD cell 1 is connected to the L on the other end.
By making the length longer than the CD pins 3, the LCD cell 1 can be held inclined with respect to the circuit board 4. The circuit board 4 is fixed by a circuit board supporting portion 6 integrally formed with a resin housing (case) 5.

As shown in the plan view of FIG. 2, a plurality of LCD pins 2 and 3 are provided at one end and the other end of the LCD cell 1, respectively. Each of the LCD pins 2 and 3 is connected to the LCD cell 1
In order to adjust the angle at which the device is mounted on the circuit board 4, it is bent at predetermined portions (portions indicated by reference numerals 2a and 3a in the drawing) as shown in FIG. In addition, a plurality of L
The LCD pins (hatched in the figure) at the four corners of FIG. 2 among the CD pins 2 and 3 are as shown in FIG.
It has a shape having bent portions 2b and 3b at the bases, whereby positioning when attaching the LCD cell 1 can be performed.

As shown in FIG. 3, the circuit board 4 has an LC
LED for backlight as light source for illumination of D cell 1
8 and a light guide plate 7 for guiding light from the backlight LED 8 to the back surface of the LCD cell 1 are attached. As shown in FIG. 4, the light guide plate 7 has a shape required to incline the LCD cell 1 at a certain angle with respect to the circuit board 4 and to obtain a uniform surface luminance with respect to the LCD cell 1. The light guide plate 7 is provided with legs 7a and 7b at both ends by integral molding, so that the light guide plate 7 can be attached to the circuit board 4. In the figure, LE for backlight is used.
Although one D8 is provided below the light guide plate 7, a plurality of backlight LEDs 8 may be provided.

FIGS. 4A, 4B and 4C show the light guide plate 7.
5 shows a front view, a plan view, and a right side view, respectively.
FIG. 4C shows an AA ′ cross section of FIG. The light guide plate 7 includes an incident surface 71 on which light from the backlight LED 8 is incident, and a first reflecting surface 7 that reflects light incident through the incident surface 71.
2, a second reflection surface for reflecting the light reflected by the first reflection surface 72, and a diffusion surface 74 parallel to the back surface of the LCD cell 1.

The diffusing surface 74 has a light diffusing sheet (not shown), and irradiates the light reflected by the second reflecting surface 73 to the back surface of the LCD cell 1 in a diffused manner. The diffusion surface 74
May be subjected to diffusion processing. in this way,
By performing diffusion irradiation from the diffusion surface 74 to the back surface of the LCD cell 1, unevenness in the surface luminance of the LCD cell 1 can be reduced.

Here, according to the configuration shown in FIG. 5, the light reflected on the second reflecting surface 73 irradiates the diffusing surface 74 almost uniformly, but the directivity and intensity of the backlight LED 8 are changed. When the lengths and angles of the first and second reflecting surfaces 72 and 73 and the diffusing surface 74 are limited, as shown in FIG.
There is a problem that the light reflected on the reflection surface 73 is concentrated and irradiated on a part of the diffusion surface 74.

For this reason, it is preferable that the first and second reflecting surfaces 72 and 73 have the following shapes. First,
It is preferable that the first reflection surface 72 has a shape capable of adjusting the direction of the reflected light, specifically, a step shape. This step shape can be formed as follows.
In FIG. 7, it is assumed that nine direct lights are obtained by equally dividing the incident range of the direct light incident on the first reflection surface 72 from the backlight LED 8 at different angles into eight. Are reflected at desired angles (for example, angles parallel to the incident surface 71 as shown in the figure), and are converted into substantially parallel lights (including those that become completely parallel) at equal intervals. A reflection surface having an angle is formed. Then, by connecting all the reflecting surfaces along the second, fourth, sixth, and eighth direct light, the first reflecting surface 72 can be formed in a stepped shape.

Further, if a step shape as shown in FIG. 8 is used, the density of light reflected on the first reflecting surface 72 can be adjusted. It should be noted that the reflected light can be adjusted more finely by increasing the number of steps in the staircase shape as compared with those shown in FIGS. Further, the first reflecting surface 72 may be formed into a curved surface shape, and may be reflected in the direction of the second reflecting surface 73 as substantially parallel light.

It is preferable that the second reflection surface 73 has a stepped shape as shown in FIG. The stepped shape allows the diffused surface 74 to be efficiently irradiated with the reflected light. In this case, as shown in FIGS. 10 and 11,
If a rounded portion on the stairs portion or a reflective surface portion is rounded, the reflected light can be diffused light, so that the unevenness of the surface luminance of the LCD cell 1 can be further reduced.

Further, as shown in FIG.
3, the light reflected by the first reflecting surface 72 can be changed in density and reflected by increasing the area of the reflecting surface portion located far from the first reflecting surface 72 in inverse proportion. Therefore, the surface luminance of the LCD cell 1 can be made uniform. In this case, as shown in FIG. 13 and FIG. 14, unevenness of the surface luminance of the LCD cell 1 can be reduced by forming a radius on the uneven portion of the step portion or the reflection surface portion.

The second reflecting surface 73 may have a curved shape other than the stepped shape, and may adjust the reflection direction and the reflection density. In the above description, the shape of the light guide plate 7 has been described in one cross-sectional direction. However, in other cross-sectional directions, a reflection surface is formed by the same method as described above, and light is transmitted to the diffusion surface 74. Irradiation is performed more efficiently and uniformly. (Other Embodiments) In the configuration shown in FIG.
Is set at the positions indicated by reference numerals 2a and 3a in order to set the angle at a predetermined angle, but may be set at the base. In addition, LC having bent portions 2b and 3b for positioning
The D pins may be pins other than the four corners. Also, L
When soldering the CD pins 2 and 3 to the circuit board 4, LC
As long as the position of the D cell 1 can be fixed at a specific position, the positioning bent portions 2b and 3b may not be provided.

The LCD cell 1 is not limited to the double-pin type, but may be a single-pin type. In this case, the angle of the LCD cell 1 is set by bending one pin (for example, the LCD pin 2) in the same manner as that shown in FIG. However, if the fixing of the LCD cell 1 is insufficient, it is necessary to fix the LCD cell 1 by another means.

As a light source, an LE for a backlight is used.
The D8 is not limited to the type in which the D8 is mounted on the surface of the circuit board 4, but may be configured using a pin-type LED 10 as shown in FIG. In this case, as shown in a cross-sectional view of FIG. 16 (a cross-sectional view at a position similar to the AA ′ cross-sectional position of FIG. 4), the light guide plate 9 includes a diffusion surface 91 parallel to the back surface of the LCD cell 1, And a reflection surface 92 that reflects light emitted from the pin type LED 10. In the light guide plate 9, light emitted from the pin type LED 10 is directly guided to the diffusion surface 91. However, since the light amount distribution is not uniform only with the direct light, the light reflected by the reflection surface 92 is guided to the diffusion surface 91 to adjust the light amount distribution, and the LC
The surface luminance of the D cell 1 is made uniform.

In the embodiment shown in FIGS. 15 and 16, the pin type LED 10 can be provided outside the LCD pin 2 instead of inside, in which case the light from the pin type LED 10 is Need to be unobstructed. The first and second reflection surfaces 72 and 73 of the light guide plate 7 and the reflection surface 9 of the light guide plate 9 described above.
2 is mirror-finished to increase the reflection efficiency,
Alternatively, it is preferable to use one having a reflection film formed by aluminum deposition or the like.

As the light source, the LED 8 described above is used.
The number of light sources is not limited to one, but may be more than one, such as a fluorescent lamp, a light bulb, a neon lamp, or the like. When the LCD cell 1 is of a transmissive or transflective type, a light source and a light guide plate are required. However, when a reflective LCD cell is used, the light source and the light guide plate are unnecessary.

As described above, according to the various embodiments described above, the LCD cell 1 is directly connected to the circuit board 4 by using the LCD pins 2 and 3, so that FIG.
LCD mounting board 112, which was necessary in the conventional type shown in FIG.
Flat wire 121, flat wire connector 11
9, 120, the LCD support 110a, and the LCD fixing screw 117 can be eliminated. Also, such L
By eliminating the CD mounting board 112, the flat wire 121, and the like, assembly can be facilitated and production efficiency can be improved. Further, since the flat wire 121 is not used, there is no problem such as a contact failure due to an assembly error, a disconnection, a contact failure due to loosening due to vibration, and the like, and reliability can be improved.

The display device according to the present invention is not limited to the one used for the on-vehicle device in the automatic fee collection system.
Other display devices, such as a headphone stereo, T
The present invention can also be applied to a V remote controller or the like. Further, the display panel is not limited to an LCD cell, but may be an EL display panel or the like.

[Brief description of the drawings]

FIG. 1 is a diagram showing a cross-sectional configuration of a vehicle-mounted device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a plan configuration of the LCD cell 1 shown in FIG.

FIG. 3 is a perspective view showing a configuration of a backlight LED 8 and a light guide plate 7 mounted on the circuit board 4 shown in FIG.

FIG. 4 is a view showing a configuration of a light guide plate 7;
(C) shows a front view, a plan view, and a right side view of the light guide plate 7, respectively.

FIG. 5 is a view showing a cross section taken along line A-A ′ of FIG. 4 (c).

6 is a diagram for explaining a problem of the light guide plate 7 shown in FIG.

FIG. 7 is a diagram illustrating a specific shape of a first reflection surface 72 of the light guide plate 7;

8 is a diagram illustrating another specific shape of the first reflection surface 72 of the light guide plate 7. FIG.

FIG. 9 is a diagram illustrating a specific shape of a second reflection surface 73 of the light guide plate 7.

FIG. 10 is a diagram illustrating another specific shape of the second reflection surface 73 of the light guide plate 7;

FIG. 11 is a diagram illustrating still another specific shape of the second reflection surface 73 of the light guide plate 7.

FIG. 12 is a diagram illustrating still another specific shape of the second reflection surface 73 of the light guide plate 7.

FIG. 13 is a diagram illustrating still another specific shape of the second reflection surface 73 of the light guide plate 7.

FIG. 14 is a view for explaining still another specific shape of the second reflection surface 73 of the light guide plate 7;

FIG. 15 is a diagram showing an embodiment using a pin type LED 10 as a light source.

FIG. 16 is a view for explaining the operation of the apparatus shown in FIG. 15;

FIG. 17 is a diagram showing a block configuration of an in-vehicle device.

FIG. 18 is a diagram for explaining a mounting position of the vehicle-mounted device.

FIG. 19 is a diagram showing an external configuration of an in-vehicle device.

FIG. 20 is a diagram showing a configuration of a conventional on-vehicle device created by the present inventors.

[Explanation of symbols]

1 ... LCD cell, 2, 3 ... LCD pin, 4 ... circuit board,
5: housing, 7, 9: light guide plate, 8, 10: L as light source
ED.

Claims (10)

[Claims] A circuit board (4), and a display panel (1) having a plurality of signal pins (2, 3) on one end and the other end for signal connection with the circuit board (4). The signal pin (2) on one end is a signal pin (3) on the other end.
The signal pin (2) on one end and the signal pin (3) on the other end are attached to the circuit board (4), and the display panel (1) is attached to the circuit board (4). A display device, characterized in that the display device is held inclined with respect to. 2. The signal pin according to claim 1, wherein the signal pins on one end and the other end are bent to adjust an angle of attachment to the circuit board. The display device according to the above. 3. The signal pins (2, 3) on the one end side and the other end side include signal pins having a shape defining a mounting height to the circuit board (4). Item 3. The display device according to item 1 or 2. 4. The display panel (1), which performs display by transmitting light from the back surface, comprises a light source (8) attached to the circuit board (4), and a light source (8).
And a light guide plate (7, 9) for guiding light from the display panel (1) to the back surface of the display panel (1).
The display device according to any one of the above. 5. A circuit board (4), and a plurality of signal pins (2, 3) attached to the circuit board (4) and connected to the circuit board (4) for signal transmission. A display panel (1) that performs display according to (1), wherein the display panel (1) is held inclined with respect to the circuit board (4), and is mounted on the circuit board (4). Light source (8), a first reflecting surface (72) for reflecting light emitted from the light source (8), and a second reflecting surface for reflecting light reflected by the first reflecting surface (72). And a light guide plate (7) for diffusing and irradiating the light reflected by the second reflection surface (73) to the back surface of the display panel (1). 6. The display device according to claim 5, wherein the light guide plate has a diffusion surface for diffusing the light reflected by the second reflection surface. 7. The first reflecting surface (72) is formed in a shape that reflects light incident at different angles from the light source (8) as substantially parallel light in the direction of the second reflecting surface (73). The display device according to claim 5, wherein: 8. The device according to claim 5, wherein the second reflecting surface is formed in such a manner that the light reflected by the first reflecting surface is changed in density and reflected. 7
The display device according to any one of the above. 9. The device according to claim 5, wherein said second reflection surface is formed in a shape for diffusing and reflecting light reflected by said first reflection surface. The display device according to any one of the above. 10. A circuit board (4), and a plurality of signal pins (2, 3) attached to the circuit board (4) and connected to the circuit board (4) for signal transmission. A display panel (1) that performs display according to (1), wherein the display panel (1) is held inclined with respect to the circuit board (4), and is mounted on the circuit board (4). Light source (10)
A light diffusing surface (91) disposed opposite to the back surface of the display panel (1), and a reflecting surface (92) for reflecting direct light emitted from the light source (10); (10)
Is configured to guide the direct light emitted from the light source to the diffusion surface (91), and to adjust the light amount distribution of the direct light guided to the diffusion surface (91) by the light reflected by the reflection surface (92). A light guide plate (9).