JPS58211742A - Information display device for moving body - Google Patents

Abstract

PURPOSE:To obtain an information display with a liquid crystal display panel which is cooled effectively by blowing an air flow to a draft air duct connecting two ventilating holes, a light source, and the liquid crystal display panel by a fan. CONSTITUTION:A gap A is formed between the liquid-crystal panel 3 and a cover 2 and a semitranparent screen 4 is provided in contact inside of the panel 3. The film information projecting device 10 consisting of a magnifying lens 14, cassette case 11, condenser group 13, and halogen lamp 12 is arranged facing a screen 4. A vertilation, hole 1c is formed at the front position of the bottom plate 1b of a case 1 and a ventilation hole 1e is formed at the rearmost position of the case 1; and the fan 15 is provided between halogen lamp 12 and ventilation hole 1e. The fan 15 changes an air-flowing direction from the ventilating hole 1c to the ventilating hole 1e or reversely.

Description

[Detailed Description of the Invention] This relates to an information display device for a mobile object that can display the driving route of a vehicle or the like by superimposing it on an image, and in particular, it is capable of effectively cooling a liquid crystal display panel and is capable of effectively cooling the device. The present invention relates to an information display device for a mobile object that is improved so as to be able to remove cod knots.

Recently, a driving guidance system has been developed that displays the vehicle's travel trajectory and road map on a screen to inform the driver of the vehicle's travel route. This system uses a detector to detect the direction and distance traveled by a vehicle, calculates this detected information using a microcomputer to determine the vehicle's travel route, and displays the travel route in dots on the display screen of a mobile information display device. In addition to showing the trajectory of the vehicle, a map corresponding to the driving area is superimposed on the display screen. Although a cathode ray tube or the like is used as a means for displaying the travel trajectory in this information display device for a moving object, currently, adoption of a liquid crystal display panel is being considered as the most suitable method due to installation space and cost considerations. That is, a driving trajectory calculated by a microcomputer is displayed on a liquid crystal display panel, while map information is projected by a projection device onto a screen integrated with the liquid crystal display panel, and the enlarged and projected map information and the vehicle driving path are displayed superimposed. This allows for visual inspection.

However, in this type of mobile information display device, the case contains both the liquid crystal display panel and the halogen lamp used for the film projection means, so the temperature inside the case rises considerably due to the heat generated by the parogen lamp. . Especially in the summer, the temperature inside the vehicle itself becomes high, so that the temperature inside the information display device for a mobile object rises to nearly 100°C. On the other hand, the operating temperature range of the liquid crystal display panel is -300C-+
Since r = about 85°C, it is necessary to effectively cool the inside of the case of the information display device for a mobile object in order to stabilize the operation. Additionally, during the cold winter months and the humid rainy season, moisture from inside the vehicle adheres to the inside of the case and forms condensation. When this dew condensation occurs on a liquid crystal display panel or a lens of an information projection device, the displayed information becomes blurred and difficult to see.

However, problems such as dew condensation on metal parts can easily cause rust.

The present invention can solve the above-mentioned problems, and although it has a simple structure, 1. It is an object of the present invention to provide an information display device for a mobile object that is equipped with ventilation means that can effectively cool a liquid crystal display panel and remove dew condensation as necessary.

In the present invention, two ventilation openings are formed in the case, a ventilation path is formed that connects the two ventilation openings, the optical display of the projection device, and the liquid crystal display panel, and the direction of the ventilation can be switched to this ventilation path. It is equipped with a fan that can be used.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of an information display device for a mobile object according to the present invention, FIG. 2 is a longitudinal sectional view showing the cooling operation, and FIG. 3 is an exposed view. It is a longitudinal cross-sectional view showing a condensation removal operation.

Reference numeral 1 in the figure is a case, and a display window 1a is opened at the front of the case 1. This case 1 is installed on an instrument panel in front of the driver's seat of an automobile. A transparent cover 2 made of anti-reflection treated glass, resin, etc. is attached to the display window 1a.
A translucent liquid crystal display panel 3 is provided inside this cover 2. A translucent screen 4 is provided in close contact with the inside of this liquid crystal display panel 3. Note that a gap A is formed between the liquid crystal display panel 3 and the cover 2. 1. A ventilation opening 1c is formed at the front of the bottom plate 1b of the case 1. This ventilation port 1c is formed to be long in the width direction of the case 1, facing toward the side edge $a of the liquid crystal display panel 3 (see Figure 1). A lower air guide plate 5 is provided inside the bottom plate 1b of the case l. This lower air guide plate 5 has a width (dimension in the direction perpendicular to the plane of the paper in FIG. 2) that is the same as the length of the ventilation port 1c.
The front end 5a extends to near the center of the ventilation port 1c. A gap B is formed between the front end 5a and the liquid crystal display panel 3, and a gap C is formed between the lower air guide plate 5 and the bottom plate 1b of the case. On the other hand, an upper air guide plate 6 is disposed inside the upper plate 1d of the case 1. This upper air guide plate 6 is molded to have the same dimensions as the lower air guide plate 5. The front end 6a of the upper air guide plate 6 is in contact with the upper end of the liquid crystal display panel 3 without any gap, and a gap is formed between the upper air guide plate 6 and the case side plate 1d.

Furthermore, a film information projection device 10 is provided within the case. This film information projection device 10 includes a cassette case 11 storing a microfilm recording map information, etc., a halogen lamp 12 located behind the cassette case 11, and a halogen lamp 12 located between the cassette case 11 and the halogen lamp 12. Condensing lens group 13 and magnifying lens 1 located in front of cassette case 11
It is composed of 4 etc. This film information projection device 10 is arranged so as to face the liquid crystal display panel 3 and the screen 4.

A ventilation port 1e is formed at the rearmost portion of the case 1. This ventilation port 1e is open toward the light source 12. By providing the ventilation port 1c and the ventilation port 1e, 1 in the case 1 flows from the ventilation port 1c to the ventilation port 1e (see Figure 2), or from the ventilation port 1e to the ventilation port 1c (the third (See figure) 3 ventilation paths α and β
, γ will be formed. This ventilation path α, β, γ
(In particular, α and β) connect the ventilation port 1c, the liquid crystal display panel 3, the halogen lamp 12, and the ventilation port 1e. A 77715 is provided between the halogen lamp 12 and the ventilation port 1e where the air passages α, β, and r converge. This fan 15 is driven by a reversible motor, and the direction of air blowing can be changed from the ventilation port 1c to the ventilation port 1e, and vice versa.

In the illustrated embodiment, switching of the air blowing direction by the fan 15 is performed based on a signal from the control unit 20. Further, a dew condensation sensor 16 is attached to the liquid crystal display panel 3 or the screen 4, and a signal from this dew condensation sensor 16 is inputted to the control section 20. The control unit 20 has a function of detecting a signal from the dew condensation unit 16 and, based on this detection, switching the air blowing direction of the fan 15 from the direction of the ventilation port 1c→le to the direction of the ventilation port 1e→1c. .

Next, the operation and effects of the information display device for a mobile object having the above configuration will be explained.

When a car equipped with this moving object information display device runs, the information measured by the direction detector and distance detector mounted on the vehicle is processed by the microcomputer also mounted on the vehicle, and this calculation output is displayed as a dot on the liquid crystal display panel 3 as the vehicle travel trajectory.

On the other hand, among the microfilms in the cassette case 11, the one recording the map corresponding to the driving area is searched,
The film information is enlarged and projected onto the leaf 4 by the light of the halogen lamp 12, and a map is formed on the screen 4.The screen 4 is semi-transparent and the liquid crystal display panel 3 is translucent. From the outside of the display window 1a, the map and the trajectory of the vehicle traveling on the map can be visually observed in a superimposed manner.

Then, the fan 15 rotates along with the above basic operation. Normally, the fan 15 performs the cooling operation shown in FIG. That is, the fan 15 operates to blow air in the direction from the ventilation port 1c to the ventilation port 1e.

By this operation, the air inside the case 1 is discharged to the outside through the ventilation port 1e, and at the same time, fresh outside air is introduced into the case 1 through the ventilation port 1c. The outside air flowing in through the ventilation opening 1c is
At the side end surface 3a of the liquid crystal display panel 3 and the front ends 5a of the lower air guide plate 5, the air flow is divided into three airflow paths indicated by α, β, and γ. The flow along the air passage α cools the front surface of the liquid crystal display panel 3 through the gap A in front of the liquid crystal display panel 3, passes through the gap above the upper air guide plate 6, and is further accompanied by the heat of the halogen lamp 12. and is exhausted from the ventilation port 1e. Further, the flow along the air passage β passing through the gap B between the side edge 3a of the liquid crystal display panel 3 and the front end 5a of the lower air guide plate 5 first flows along the rear surface of the liquid crystal display panel 3. The liquid crystal display panel 3 is cooled from the rear surface, and then flows rearward and is exhausted from the ventilation port 1e along with the heat from the halogen lamp 12. still,
The air flowing along the air passage γ passing through the gap C between the lower air guide plate 5 and the bottom plate 1b is directly connected to the halogen lamp 12.
When the heat from the halogen lamp 12 hits the ventilation opening 1e,
Exhaust from J↓ru. Each of the above air ducts α.

The flow rates of β and r can be changed by adjusting the intervals of gaps A, B, C, and D between each member. In order to sufficiently cool the liquid crystal display panel 3 and stabilize its operation, it is most ideal that the air flow rate in the air passage α be greater than the sum of the air flow rates β and γ. Next, when dew condensation occurs on the liquid crystal display panel 3 or the screen 4 integrated therewith during periods of high humidity, the dew condensation sensor 16 detects this and sends a signal to the control section 20.

Based on this signal, a relay in the control section 20 operates, and the rotation direction of the fan 15 is switched. Therefore, the ventilation path by the fan 15 is as shown in FIG.
e to the ventilation port 1c. When the direction of air blowing by the fan 15 is changed, the flow of air in each of the air passages α, β, and γ becomes opposite to the cooling operation shown in FIG. 2. That is, the outside air is introduced from the ventilation port 1e, and this outside air, along with the heat from the logen lamp 12, passes through the ventilation paths α, β, and r to the ventilation port 1''.
It is exhausted from c. The air flow passing through the air passages α and β is
It acts to remove dew condensation on the liquid crystal display panel 3 and screen 4 by heat. 1, ventilation paths α, β,
The hot airflow through γ also removes any condensation that may have formed on the lenses 13, 14 and other components. When the dew condensation is completely removed, the detection signal from the dew condensation sensor 16 disappears, and inside the condensation control section 20, the 16 of the fan 15 returns.
”Switch the direction of rotation. Therefore, the airflow by the fan 15 returns to the state shown in FIG. 2, and the cooling operation is performed.

Note that the installation location of the fan 15 is not limited to the example shown in the figure.
It may be provided in close contact with the outside of the ventilation port 1e, or it may be provided in the vicinity of the ventilation port 1c.

Furthermore, the cooling and dew condensation effects are slightly lowered by 5, but the ventilation opening 1e
the light source 12 on the top plate 1d or bottom plate 1b of case 1.
It may be formed towards.

As described above, according to the present invention, the following effects can be achieved.

(1) By switching one fan, the heat from the light source can be released outside the case, preventing the environmental temperature of the LCD panel from rising above the limit value, and conversely, the heat from the light source can be sent into the case. Since dew condensation can also be removed, the environment inside the device case can always be kept optimal, improving the reliability of the device.

(2) In particular, the dew condensation removal operation can remove dew condensation from the liquid crystal display panel, screen, and lens of the projection device.
You can always check the displayed information in a clear state without blurring it.

(3) Since the air passage is formed to connect the two ventilation holes, the light source, and the LCD panel, the LCD panel is effectively cooled during cooling, and the light source is closed when removing dew. Heat is effectively distributed to the liquid crystal display panel.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a perspective view of an information display device for a moving object, FIG. 2 is a longitudinal sectional view of the information display device for a moving object showing cooling operation, and FIG. 3 is a longitudinal sectional view of the information display device for a moving object. FIG. 3 is a vertical cross-sectional view showing the dew condensation removal operation. 1...Case, 1a...Display window, LC, LE・
... Ventilation vent, 3... Liquid crystal display panel, 4... Screen, 10... Information projection unit, 11... Film container, 12... Light source, 15... Fan,
16... Dew condensation sensor, 20... Control unit

Claims (1)

[Claims] A liquid crystal display panel and an information projection device are provided inside the case, and a display window is formed at a position where the display on the liquid crystal display panel and the image from the information projection device can be viewed together, and the case has an opening facing the liquid crystal display panel. ventilation openings and
A ventilation hole is formed that opens toward the light source of the information projection device, and a ventilation path is formed that connects both ventilation holes, the light source, and the liquid crystal display panel, and this ventilation path has a structure that allows the airflow direction to be switched in the opposite direction. An information display device for a mobile object that is equipped with a fan.