JPH10114241A - Display device of work vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent difficulties in seeing the contents displayed in a liquid crystal display part which are caused by external light reflected on a surface of a cover body securely by forming the surface of the cover body which covers an upper part of a surface of the liquid crystal display part and allows seeing through it into a three-dimensional curved shape which protrudes in the forward and backward directions of a car body and in the direction of lateral width of the car body. SOLUTION: An hour meter and a liquid crystal display part are assembled in a display face 9a of a display panel C of a combine for agricultural work. This liquid crystal display part is supported by a casing 22, and a cover body 21 which allows seeing through it is assembled in this casing 22. In this case, a surface of the cover body 21 is formed into a three-dimensional curved shape which protrudes in the forward and backward directions of a car body and in the direction of lateral width of the car body. That is, a shape of the display panel C in a view in the direction of horizontal side face and a view in the direction of lower side face is formed into a circular arc shape, and radius of curvature of circular arc in the view in the direction of the lower side face is formed to be larger than radius of curvature of circular arc in the view in the direction of the horizontal side face. A vertex position Tp in the three-dimensional curved shape of the cover body 21 is set near a central part in the direction of a front view of the display face 9a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device for a working vehicle provided with a liquid crystal display section for displaying alarm information and a transparent cover body covering the display surface at a position in front of a driver's seat. .

[0002]

2. Description of the Related Art For example, in a control section of a working vehicle such as a combine or a tractor, a liquid crystal display section for displaying various notification information as image information is provided on a panel type display device provided in front of a driver's seat. It is provided so that the upper part of the surface is covered with a protective cover made of a transparent resin plate or the like.

[0003]

However, in the prior art, external light such as sunlight, which has entered the display device, is reflected directly on, for example, the surface of a planar cover body and enters as strong light to the driver's eyes. In some cases, the display contents of the liquid crystal display unit became difficult to see.

The present invention has been made in view of the above circumstances, and an object of the present invention is to solve the above-mentioned disadvantages of the prior art by using external light reflected on the surface of a cover to display a liquid crystal display. It is to appropriately prevent the contents from being difficult to see.

[0005]

According to the first aspect of the present invention, the notification information displayed on the liquid crystal display provided in front of the driver's seat is seen through a cover body that covers the display surface of the liquid crystal display. When viewed from the outside, external light, such as sunlight, incident on the surface of the cover body is reflected in a direction in which it is dispersed on the surface of the cover body formed into a cubic curved shape that protrudes in both the vehicle longitudinal direction and the vehicle body width direction. Is done.

Accordingly, external light reflected from the surface of the cover body does not enter the driver's eyes as strong light, and the display contents of the liquid crystal display section can be viewed in a good state.

According to a second aspect, in the first aspect, the external light incident on the surface of the cover body has a cubic curved surface shape whose vertex position is near the center of the display surface of the liquid crystal display unit in the front view direction. Are reflected in a state of being dispersed from the vicinity of the central portion in the front view direction of the display surface of the liquid crystal display unit.

Therefore, it is possible to appropriately disperse and reflect the external light incident near the central portion of the display surface of the liquid crystal display portion in the front view direction to reflect the display contents of the liquid crystal display portion in a better condition. Thus, the preferred measures of claim 1 are obtained.

According to a third aspect, in the first or second aspect, the cover is assembled to a casing that supports the liquid crystal display.

Therefore, for example, 3
While avoiding the complexity of manufacturing the next curved cover body and the liquid crystal display as an integral part, separate the cover and the liquid crystal display as separate parts in an appropriate state based on the casing. And it can be easily assembled, so that the preferable means of claim 1 or 2 is obtained.

According to a fourth aspect of the present invention, in any one of the first to third aspects, the external light incident on the surface of the cover body that covers above the display surfaces of both the liquid crystal display portion and the illuminated display portion,
The light is reflected in the direction of dispersion on the surface of the cubic curved cover body.

Therefore, in a display device provided with a light-on display together with a liquid-crystal display, the display contents of both the liquid-crystal display and the light-on display can be viewed in good condition. The preferred means of any one of the above is obtained.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a display device provided in a control section of a combine for agricultural work will be described below with reference to the drawings. The combine is, as shown in FIG.
A mowing unit 12 is provided at the front of the body V equipped with the steering unit 1, and a control unit 1 having a driver's seat 13 </ b> A behind the mowing unit 12.
3. A threshing unit 14 for threshing and sorting the harvested grain culms that have been reaped by the reaping unit 12, a Glen tank 15 for storing grains supplied from the threshing unit 14, and the like are mounted.

As shown in FIGS. 2 and 3, a display panel C for displaying various information necessary for the operation of the combine.
Are provided as a single unit-shaped frame at a location in front of the driver's seat 13A. The display panel C includes a liquid crystal display unit 1 configured as a dot matrix type graphic display, and a charging lamp 2, a preheating lamp 3, an oil lamp 4, a caution lamp 5, and a pair of left and right turn signal lamps as lighting display units. 6 are assembled. The liquid crystal display unit 1 has a horizontally long display surface 9a on which operation information such as an hour meter (operating time), engine speed and engine load, and other notification information are displayed (FIG. 1). 8).

As illustrated in the contrast curve of FIG. 6, the viewing angle range in which the notification information displayed on the horizontally long display surface 9a of the liquid crystal display unit 1 can be viewed in the horizontal direction (the horizontal direction in the figure corresponds to the horizontal direction). Is wider than the vertical viewing angle range in the vertical direction (corresponding to the vertical direction in the figure). Incidentally, in the example of FIG. 6, while the front direction is set as a reference (0 degree), the horizontal direction can be visually recognized within a range of 40 degrees each on the left and right sides (total of 80 degrees), whereas the upper and lower directions are 0 to 30 degrees. Visible in a range of degrees.

The noticeable information displayed on the display surface 9a of the liquid crystal display unit 1 is the visual equivalent position of the driver sitting on the driver's seat 13A and the visual equivalent position of the driver standing immediately before the driver's seat 13A. The liquid crystal display unit 1 is mounted on the display panel C so that the liquid crystal display unit 1 is located within a viewing angle range in the vertical and horizontal directions that can be visually recognized.
Has been assembled. Specifically, since the vertical viewing angle range of the liquid crystal display unit 1 is narrow, as shown in FIG. 2, the viewing direction x from the position corresponding to the viewing of the driver sitting on the driver's seat 13A to the display surface 9a; Line-of-sight direction y from the driver's standing position immediately in front of driver's seat 13A to the display surface 9a from a position equivalent to visual observation.
The center angle direction z of the viewing angle range in the vertical direction of the liquid crystal display unit 1 is set to an intermediate angle direction z. here,
The center angle direction z of the viewing angle range in the vertical direction is deviated from the vertical direction of the display surface 9a from FIG.
It is set to a direction of about 15 degrees from above (see FIG. 4), and the display surface of the display panel C is inclined so as to become higher toward the front of the vehicle body.

As shown in FIGS. 4 and 5, the liquid crystal display 1
Is supported by a casing 22, and a transparent cover body 21 that covers the casing 22 over both the display surface 9a of the liquid crystal display unit 1 and the transmissive sheets 2b to 6b as display surfaces of the lamps 2 to 6 is provided. Is assembled. The surface of the cover body 21 is formed in a cubic curved surface shape that protrudes in both the vehicle longitudinal direction and the vehicle width direction. Specifically, a lateral side view of the display panel C (FIG. 4)
And the shape in the lower side view (FIG. 5) is formed in an arc shape, and the radius of curvature of the arc in the lower side view is larger than the radius of curvature of the arc in the lateral side view. I have. Then, as shown in FIG. 3, the vertex position Tp of the cubic curved surface shape of the cover 21 is determined by the display surface 9 a of the liquid crystal display unit 1.
Is set near the center in the front view direction. In this example, the apex position Tp is slightly shifted from the center position of the display surface 9a of the liquid crystal display unit 1 in the front view direction, but both positions may be completely matched. .

A meter controller 7 (see FIG. 7) for controlling the operation of the liquid crystal display unit 1 and a backlight L
ED light source 8 and LEDs for lighting each of lamps 2 to 6
Light sources 2a to 6a (light source 5a for caution lamp 5 in FIG. 4)
And FIG. 5 shows a light source 3a for the preheating lamp 3).
Are mounted on the casing 22 of the display panel C. Here, the light source 8 for the backlight of the liquid crystal and the light sources 2a to 6a for the lamps 2 to 6 are assembled to the substrate 20 along the vertical direction.

Each of the light sources 2a to 6a,
A space for guiding the light from 8 toward the front side (right side in the figure) is defined. Then, corresponding to each of the lamps 2 to 6, the transmissive sheets 2b to 6b which receive the light from each of the light sources 2a to 6a and transparently display characters such as "caution" are provided on the casing 22 in a posture parallel to the substrate 20. In a state in which cylindrical light guides 2c to 6c directed forward are provided on the peripheral edges of the transmissive sheets 2b to 6b, the inclined guide surfaces being located closer to the side away from the display surfaces 2b to 6b toward the front. Is provided. 4 shows a transmission sheet 5b and a light guide 5c for the caution lamp 5, and FIG. 5 shows a transmission sheet 3b and a light guide 3c for the preheating lamp 3.

On the other hand, the liquid crystal display section 1 is provided with a flat black-and-white liquid crystal display element 9 having a horizontally long display surface 9a and a reflection plate 10 located on the back side of the liquid crystal display element 9. The backlight LED light source 8 projects illumination light toward the rear side of the reflection unit 10. Here, the display surface 9 a of the liquid crystal display unit 1 is attached to the casing 22 in a posture inclined with respect to the substrate 20.

The reflecting plate 10 is a semi-transmissive reflecting member that reflects a part of the incident light and transmits a part of the incident light. Here, the incident light is on the right side of the figure (the liquid crystal display element 9).
When the light enters from either side (front side of the backlight) or left side (the side of the backlight light source 8), it functions as the semi-transmissive reflecting member. Specifically, the reflector 10 includes a translucent colored layer 10a that emits yellow fluorescent light, and the colored layer 10a.
And the semi-transmissive reflective layer 10b located on the back side of the liquid crystal display element 9 so that the gray color of the monochrome liquid crystal display element 9 and the yellow fluorescent color of the semi-transmissive colored layer 10a are changed. A high-class color of a mixed dark yellow (or greenish gray) can be seen on the display screen 1.

With the above configuration, in a bright external illumination light condition such as daytime sunlight, the light incident from the front side of the liquid crystal display element 9 is reflected by the reflector 10 arranged on the rear side of the liquid crystal display element 9. And a backlight type light source 8 in a dark external illumination light condition such as at night.
And a transmissive display that transmits the illumination light projected from the rear side of the liquid crystal display element 9.

FIG. 7 shows a control configuration of the display panel C. The oil lamp 4 has an oil switch SW1
The lamp is turned on when (normally off) is turned on, and the charging lamp 2 is turned on by the charge switch SW2 (normally off).
Lights when is turned on. Each turn signal lamp 6
Lights up when the left and right turn signal switches SW3 are turned on. The backlight source 8 for the liquid crystal is turned on when the switch SW4 is turned on in conjunction with the lighting of a night light (not shown).

The display panel C has a built-in meter controller 7, which controls the display screen 1, the preheating lamp 3, the caution lamp 5, and the like. Information on various sensors is input to the meter controller 7, and the meter controller 7 executes display control on the display panel C and other various controls based on the information.

In the display control, normally, as shown in FIG. 8, operation information indicating the control state of each part of the machine is sequentially displayed on the display screen 1. That is, a predetermined time (2
Until the elapse of a predetermined time, it is determined whether or not the system is in a normal state. If the system is in a normal state, the engine is started and the set number of revolutions (500
rpm) or more until the engine rotation speed exceeds 500 rpm, the engine rotation display is performed until the harvesting operation is started, and when the harvesting operation is started, the engine speed is replaced with the engine rotation speed. To display the engine load.

FIG. 8A shows an hour meter display.
(B) shows an engine rotation display by a bar graph image moving in the right direction of the screen, and (c) shows a load level represented by a number from 1 to 4 (the larger the number, the greater the load). In each display, the remaining fuel amount is displayed as a bar graph on the left end of the display screen 1. In the bar graph image, a bar graph 1 indicating the engine speed is displayed.
a expands and contracts in a set direction (horizontal direction of the screen) with a change in the number of rotations, and a checker mark 1b indicating an appropriate rotation number position (for example, a position of 2600 rpm) of the engine is displayed on the bar graph 1a. Have been.

[Other Embodiments] The liquid crystal display unit 1 may be a monochromatic type representing a specific color or a color type such as a full color such as RGB instead of a black and white type.

The surface shape of the cover body 21 is not limited to the case where the sectional view is an arc shape, and may be, for example, a part of an elliptical shape or a parabolic shape when viewed in the sectional direction.

The lighting type display units 2 to 6 are not limited to the lamps of the above embodiment. Also, the lighting element may be an incandescent light bulb or the like other than the LED light source.

In the above embodiment, the work vehicle display device of the present invention is applied to a combine for agricultural work. However, the display device can be applied to various work vehicles other than the combine.

[Brief description of the drawings]

FIG. 1 is a side view of a combine.

FIG. 2 is a side view of a control unit.

FIG. 3 is a front view of a display panel.

FIG. 4 is a cross-sectional side view of a display panel.

FIG. 5 is a bottom cross-sectional view of the display panel.

FIG. 6 is a display characteristic diagram of a liquid crystal display unit.

FIG. 7 is a control configuration diagram of a display panel.

FIG. 8 is a diagram of a liquid crystal display screen for displaying notification information.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid crystal display part 2-6 Lighting type display part 2b-6b Display surface 9a Display surface 13A Driver's seat 21 Cover body 22 Casing

Claims (4)

[Claims] 1. A display device for a work vehicle, comprising: a liquid crystal display section for displaying notification information; and a transparent cover body that covers an upper part of the display surface, provided at a position in front of a driver's seat. A display device for a work vehicle, wherein a surface of a body is formed in a cubic curved surface shape that protrudes in both a longitudinal direction and a lateral width direction of the vehicle. 2. The work vehicle display device according to claim 1, wherein a vertex position of the cubic curved surface shape of the cover body is set near a central portion of the display surface of the liquid crystal display unit in a front view direction. 3. The display device for a work vehicle according to claim 1, wherein the cover body is attached to a casing that supports the liquid crystal display unit. 4. The lighting device according to claim 1, further comprising: a lighting type display unit, wherein said cover body covers both display surfaces of said liquid crystal display unit and said lighting type display unit. The display device for a work vehicle according to claim 1.