JPH10114242A - Display device of work vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress a rise of temperature of a liquid crystal display part so as to prevent the deterioration of its performance by assembling the liquid crystal display part on a unitlike frame body and forming a casing which constitutes the unitlike frame body by a pale color resin material. SOLUTION: An hour meter and a liquid crystal display part are assembled on 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 the 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. Moreover, the display panel C is formed by a resin material having a pale color such as white and light cream color which absorbs external light such as solar ray which irradiates on a display device and has small absorption coefficient. Consequently, it is possible to reduce a ratio of a rise of temperature, suppress a rise of temperature of a liquid crystal display device due to the transfer of heat from the casing 22, and prevent the deterioration of a performance of the liquid crystal display device properly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work vehicle display device provided with a liquid crystal display.

[0002]

2. Description of the Related Art For example, a unit type display device installed in a control section of a working vehicle such as a combine or a tractor is provided with a liquid crystal display section for displaying various kinds of information as images. In addition, work vehicles such as combine are usually
Because it is used outdoors during the day, the liquid crystal display
It is of a reflection type in which external light (sunlight) incident from the front side is reflected by a reflection plate arranged on the rear side.

[0003]

However, when a work vehicle is driven for a long time outdoors or the like in fine weather, for example, the resin casing or the like constituting the unit frame of the display device is protected from sunlight or the like. The temperature of the display device rises by absorbing the heat of
In a liquid crystal display unit incorporated in a display device, the liquid crystal element may exceed the transition temperature due to a high temperature condition and deteriorate in performance.

The present invention has been made in view of the above circumstances, and an object of the present invention is to suppress the rise in the temperature of the liquid crystal display unit and prevent the performance from deteriorating in order to solve the above-mentioned disadvantages of the prior art. Is to do so.

[0005]

According to the first aspect of the present invention, a liquid crystal display unit provided in a display device of a work vehicle is assembled to a unit frame formed of a casing made of a light-colored resin material. .

Accordingly, a casing made of a light-colored resin material such as white or light cream color has an absorption coefficient for absorbing external light such as sunlight radiated to a display device, compared to a casing made of a dark-colored resin material. Is small, the rate of temperature rise is small, and it is possible to suppress the rise in temperature of the liquid crystal display device due to conduction of heat from the casing, so that deterioration in the performance of the liquid crystal display device can be appropriately prevented.

According to a second aspect, in the first aspect, the upper part of the display surface of the liquid crystal display portion is covered with a transparent cover provided on the unit frame.

Accordingly, the display contents of the liquid crystal display can be viewed through the transparent cover, and the cover can be used as a protective cover to allow dust or the like to enter the display surface of the liquid crystal display from the outside, or to impinge on the display surface. Even if external light such as sunlight penetrates through the cover body and enters the liquid crystal display section sealed by the cover body, the external light is appropriately prevented from being damaged by hitting the object. Is hardly absorbed by the casing that supports the circumstance, and the temperature rise is suppressed, so that the preferable means of claim 1 can be obtained.

According to the third aspect, in the first or second aspect, the external light incident from the front side of the liquid crystal display is reflected by the reflecting member arranged on the rear side of the liquid crystal display.

Therefore, under bright lighting conditions such as daytime sunlight, the display contents of the liquid crystal display section can be clearly seen by the reflective display, so that the preferable means of claim 1 or 2 is obtained. .

According to a fourth aspect of the present invention, in the reflective display according to the third aspect, a part of the external light incident from the front side of the liquid crystal display section is a semi-transmissive reflecting member arranged on the rear side of the liquid crystal display section. In the transmissive display, a part of the illumination light from the illumination light source that is turned on by manual operation passes through the semi-transmissive reflective member arranged on the back side of the liquid crystal display unit, and together, the liquid crystal display It is emitted from the front side of the part.

Therefore, the display device can be conveniently used in various environments, for example, such that the reflective display is operated under bright external light illumination conditions in the daytime and the transmissive display is operated under dark illumination conditions during the evening to night. Meanwhile, for both the reflection type and the transmission type display, a simple layer configuration in which components such as a liquid crystal display unit, a reflection member, and an illumination light source are arranged in order from the front side realizes simplification of the device configuration. At the same time, uniform display light or uniform transmission light from the entire surface of the reflection member enables good display in both displays, so that the preferred means of claim 3 is obtained.

According to the fifth aspect, in the fourth aspect, in the reflection type display, a part of the external light incident from the front side of the black-and-white type liquid crystal display portion is semi-transmissive disposed on the rear side of the liquid crystal display portion. In the transmissive reflective member, after passing through the translucent colored layer to generate yellow fluorescence, it is reflected by the translucent reflective layer on the back side of the colored layer, and in the transmissive display, from the illumination light source. A part of the illumination light is transmitted through the translucent reflective layer in the translucent reflective member disposed on the back side of the liquid crystal display unit, and then the translucent colored layer on the front side of the reflective layer is formed. Transmits and emits yellow fluorescence.

Therefore, in both the reflection type and the transmission type display, a dark yellow color mixture of the gray color represented by the black and white liquid crystal display unit and the yellow fluorescent color generated in the translucent colored layer is mixed. Alternatively, a high-grade color of greenish gray can be seen as a display color of the liquid crystal display unit, whereby the preferable means of claim 4 can be obtained.

[0015]

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 kinds of information necessary for the operation of the combine.
Are provided as a 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.
A charging lamp 2, a preheating lamp 3, an oil lamp 4, a caution lamp 5, and a pair of right and left turn signal lamps 6 are assembled as lighting type display units. The liquid crystal display unit 1 includes a horizontally long display surface 9a.
Then, operating information such as an hour meter (operating time), engine speed and engine load, and other notification information are displayed (see FIG. 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). 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
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 display panel C
Is composed of a casing 22 made of a light-colored resin material such as white or light cream, and has both a display surface 9a of the liquid crystal display unit 1 and transmission sheets 2b to 6b as display surfaces of the lamps 2 to 6. Cover body 21 that covers the upper part of
It has. Then, the liquid crystal display unit 1 and the cover body 21 are assembled to the casing 22.

The surface of the cover 21 is formed into a cubic curved surface. Specifically, the shape of the display panel C when viewed in the lateral side direction (FIG. 4) and the lower side direction (FIG. 5) are both formed in an arc shape, and the radius of curvature of the arc in the lower side direction is horizontal. It is configured to be larger than the radius of curvature of the arc when viewed from the side. Then, as shown in FIG. 3, the vertex position Tp of the cubic curved surface shape of the cover body 21 is set near the center of the display surface 9 a of the liquid crystal display unit 1 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. .

Also, 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 light source 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 unit 1 is formed in a flat plate shape having a horizontally long display surface 9a, and displays a black and white image. And a reflector 10 for reflecting light incident from the front side of the liquid crystal display unit 1 and a backlight L
The ED light source 8 functions as an illumination unit that projects illumination light toward the back side of the reflection plate 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 disposed 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. When the driver turns on a night light (not shown) by the driver, the backlight light source 8 for liquid crystal is used.
The lighting is operable manually by a manual operation so that the switch SW4 is turned on and turned on in conjunction therewith.

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. In the case of a color liquid crystal display unit, the translucent reflective member 10 may be a mere translucent reflective characteristic that does not include a color component such as a yellow fluorescent color.

The surface shape of the cover 21 is not limited to a cubic curved surface.

The illumination light source 8 is not limited to the LED light source, but may be an ordinary white lamp.

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 8 Illumination light source 10 Reflection member 10a Colored layer 10b Reflection layer 21 Cover body 22 Casing C Unit frame

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI G09F 9/00 363 G09F 9/00 363Z 9/35 9/35

Claims (5)

[Claims] 1. A display device for a work vehicle provided with a liquid crystal display unit, wherein the liquid crystal display unit is assembled to a unit-shaped frame, and a casing forming the unit-shaped frame is made of a light-colored resin material. Display device for a working vehicle. 2. The work vehicle display device according to claim 1, wherein the unit frame includes a transparent cover body that covers an upper part of a display surface of the liquid crystal display unit. 3. The display device for a work vehicle according to claim 1, wherein a reflection member that reflects light incident from a front side of the liquid crystal display unit is disposed on a back side of the liquid crystal display unit. 4. An illumination light source configured to be semi-transmissive in which the reflection member reflects a part of the incident light and transmits a part of the incident light, and projects the illumination light toward the back side of the reflection member. The display device for a work vehicle according to claim 3, wherein the display is operable to be turned on by manual operation. 5. The liquid crystal display section is configured in a black-and-white mode for displaying a black-and-white image, and the reflecting member includes a translucent colored layer that emits yellow fluorescent light and a half-colored layer located on the back side of the colored layer. The display device for a working vehicle according to claim 4, comprising a transmissive reflective layer.