JP3425779B2 - OHP system with light detection function - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a liquid crystal display device and an OHP.
In an OHP system in which an OHP unit configured with the device body is remotely operated to operate the OHP unit without a dedicated operator, the lighting state of the lamp in the OHP device body is changed to a remote place, for example, an operating system. The present invention relates to an OHP system with a light detection function that has a function of detecting in a room or the like.

[0002]

2. Description of the Related Art In an OHP, an operator places a transparent film on which information is written on the body of an OHP device and displays the information on a screen provided in front of the OHP device. Combined with O
A system has also been developed in which information is input by a personal computer or the like from a location remote from the HP unit, for example, an operating room, and the information displayed on the liquid crystal display device is displayed on the screen.

In such an OHP system,
If there is an operator near the HP unit,
Not only the operation of the OHP unit but also the monitoring of the operating state can be performed. Therefore, for example, when the bulb of the lamp for displaying the information provided in the main body of the OHP device on the screen is burnt out, it is possible to immediately take appropriate measures such as replacing the lamp.

[0004]

However, in the case of operating the OHP unit remotely as described above,
Since there is no operator nearby, even if a failure such as a lamp burnout (hereinafter simply referred to as lamp burnout) occurs, it cannot be found immediately, and it may be left unlit for a while. It can happen.

For example, various information is displayed on the screen by the OHP unit and used as an unmanned electronic bulletin board, or the OHP unit is installed at an auction site and auctioned by a personal computer or the like from an operating room far away. When using a system that sends various data about auctioned items to the bidders at the venue, displays the data displayed on the liquid crystal display panel on the screen, and bids based on the data, the above-mentioned lamp When a malfunction such as a burnout occurs, the operator is not nearby, so I am going to leave the lamp off, that is, I will display various information on the screen, but I will leave it for a long time without displaying anything. A big problem occurs.

Especially, the life of the lamp in the main body of the OHP device is
Since it is about 600 hours to 700 hours, there is a possibility that a situation where the lamp is left unlit often occurs.

As described above, in the system in which the OHP unit is used without an operator arranged nearby, it is necessary to constantly monitor the lighting state of the lamp in the OHP device body by some method.

According to the present invention, an OHP unit is used in a system in which an operator is not placed nearby.
The purpose is to be able to monitor the lighting state of the lamp in the HP device main body at a location away from the OHP unit, and to immediately deal with the lamp burnout.

[0009]

As described above, the present invention provides an OH including a liquid crystal display panel and an OHP device main body.
It is assumed that the P unit will be used in a system that is operated remotely.

FIG. 1 is a diagram for explaining the principle of the present invention.
In the figure, 1 is an OHP unit.
The unit 1 is designed so that an operator can be operated from a remote place via an information processing terminal 21 such as a personal computer without being placed near the operator.

The OHP unit 1 is composed of an OHP device body 3, a liquid crystal display device 4, and a light detection means 5 for detecting the lighting state of a lamp in the OHP device body 3. The signal from the light detecting means 5 is given to a place apart from the OHP unit, for example, the lamp lighting state display means 6 provided in the operating room 2.

The light detecting means 5 is the OHP device body 3
When the lamp inside the lamp is burnt out and turned off, it is detected and the detection signal is sent to the operating room 2, for example, and the lamp lighting state display means 6 is made differential.

[0013]

[Function] Due to such a structure, the OHP device main body 3
When the lamp inside is burned out, the light detection means 5 detects it,
A lamp burnout detection signal is output. As a result, the lamp lighting state display means 6 is activated to notify the operator that the lamp in the OHP device main body 3 has burned out.

Therefore, after confirming that the lamp lighting state display means 6 has been operated, the operator immediately prompts the OHP.
The lamp in the device body 3 can be replaced, so that the operation of the OHP unit is not significantly hindered.

[0015]

EXAMPLES Examples of the present invention will be described below. 2 and 3
Is a block diagram for explaining an embodiment of the present invention, and FIG.
FIG. 3 is a perspective view showing an overall configuration of the P unit, and FIG. 3 is a view schematically showing a cross section of a main part of FIG. In FIG. 2, 1 is OH
It is a P unit and has a configuration in which, for example, a phase transition type liquid crystal display device 4 is provided on the light irradiation surface 31 of the OHP device body 3. The liquid crystal display device 4 is an LCD
Panel 41 and housing 4 supporting this LCD panel 41
2 and a light detecting means 5 (see FIG. 3) provided in the housing 42 as described later are the main constituent elements.

As shown in FIG. 3, the light detecting means 5 is a lower surface of the circuit board 7 for driving the LCD panel 41,
That is, it is provided on the surface of the OHP device body 3 that faces the light irradiation surface 31. A light passage hole 8 for passing light (indicated by an arrow A in the drawing) from the light irradiation surface 31 of the OHP device body 3 is provided in a portion of the housing 42 facing the light detection means 5. . In this way, the light detecting means 5
Is attached to the lower surface of the circuit board 7, and the light passage hole 8 of the housing 42 is attached.
The structure for detecting the light passing through is to prevent it from being affected by sunlight or light from the outside.

The light detecting means 5 is specifically constructed as shown in FIG. In FIG. 4, FTR is a phototransistor for light detection, its collector is connected to, for example, a + 5V power source, and its emitter is grounded via a sensitivity adjusting variable resistor VR. The emitter of the phototransistor FTR is connected to one input terminal of the comparison circuit COP. To the other input terminal of the comparison circuit COP, a voltage of +5 V, for example, is applied to the voltage dividing resistor R.
The voltage divided by 1 and R2 is supplied.

The light detecting means 5 has such a structure. When the light A is emitted from the OHP device main body 3, the phototransistor FTR is in the ON state, and at this time, the comparison circuit COP. Does not output the lamp burnout detection signal. On the other hand, when there is no light from the OHP device body 3, the phototransistor FTR turns off,
A lamp burnout detection signal is output from the comparison circuit COP.

The lamp burn-out detection signal from the comparison circuit COP is given to, for example, the lamp lighting state display means 6 provided in the operating room 2 to display that the lamp is burned out.

The operation of the above arrangement will be described below. If this OHP unit 1 is installed in, for example, an auction site, and it is used in a system in which various states are sent by remote control from an operating room 2 which is located away from it, and are projected on a screen,
In a normal state, information about a bid is displayed on the screen one after another.

In this state, the lamp inside the OHP device main body 3 is normally turned on, and the phototransistor FTR of the light detecting means 5 is on. Therefore, the lamp burnout detection signal is not supplied from the comparison circuit COP,
The lamp lighting display means 6 provided in the operating room 2 does not operate.

Now, assuming that the lamp has burned out and the light from the OHP device main body 3 has disappeared, the phototransistor FTR turns off and the comparator circuit COP outputs a lamp burnout detection signal. This lamp burnout detection signal is output to the operating room. It is given to the lamp lighting state display means 6 provided in No. 2 to display a lamp burnout.

The operator in the operating room 2 knows that the lamp in the OHP device main body 3 is not lit by the lamp burn-out display, and immediately takes measures such as replacement of the lamp to deal with it.

As described above, when the OHP unit 1 is used without an operator arranged near it, that is, when the OHP unit 1 is used in an unmanned state, whether or not the lamp in the OHP device main body 3 is normally turned on. The operating room 2 can make a decision, and even if the lamp goes out, it can be dealt with immediately. As a result, it is possible to prevent a situation in which various information is projected on the screen, but in fact, no information is displayed for a long time.

On the contrary, when it is not necessary to display information on the screen and the lamp in the OHP device main body 3 needs to be turned off, it is confirmed on the operating room 2 side whether or not the lamp is off. It can be done and you can prevent forgetting to turn off the lamp.

The location where the light detecting means 5 is attached is not limited to this embodiment, and the location where the light of the lamp of the OHP device body 3 can be accurately detected without being affected by sunlight or light of an electric lamp. If it is good.

[0027]

According to the present invention, a liquid crystal display device and an OHP are provided.
In the OHP unit composed of the device main body, when operating this OHP unit remotely, the lighting state of the lamp in the OHP device main body can be monitored in the operating room located away from the OHP unit. Appropriate measures can be taken immediately for cuts, etc.
The effect that it is possible to prevent forgetting to turn off the lamp when the lamp is not required to be turned on can be obtained.

[Brief description of drawings]

FIG. 1 is a configuration diagram for explaining the principle of the present invention.

FIG. 2 is a perspective view showing the outline of the overall configuration of the embodiment of the present invention.

FIG. 3 is a side sectional view schematically showing a main part of FIG.

FIG. 4 is a configuration diagram of a light detection unit in the embodiment.

[Explanation of symbols]

1 OHP unit 2 Operating room 3 OHP equipment body 4 Liquid crystal display 5 Light detection means 6 Lamp lighting status display means

Claims (3)

(57) [Claims] 1. A liquid crystal display device (4) and an OHP (Over Hea
d Projector) The OHP unit (1) composed of the device body (3) is separated from the OHP unit (1).
In an OHP system for displaying information displayed on the liquid crystal display device on a screen by remote control from a remote place , an OHP unit (1) provided on the OHP unit (1) side for displaying information on the screen A light detecting means (5) for detecting a lighting state of a lamp in the inside, and a place provided away from the OHP unit (1),
OHP system with an optical detection function, characterized in that it has a lamp lighting state display means (6) for displaying the lighting state of the lamp in response to a signal from said light detecting means (5). 2. The light detecting means (5) is a light source for the OHP device body (3) of a liquid crystal display driving circuit board (7) existing in a housing (42) of the liquid crystal display (4). The OHP system with a light detection function according to claim 1, wherein the OHP system is attached to a surface side facing the irradiation surface (31). 3. A housing (42) of the liquid crystal display device (4).
The light passage hole (8) for providing the light detecting means (5) with the light emitted from the light irradiation surface (31) of the OHP device main body (3) is provided in the said. OHP system with light detection function.