KR100382644B1 - Display controll apparatus of printer - Google Patents

Abstract

A display control apparatus of a printing press is disclosed. The display control apparatus of the printer includes a liquid crystal display device for displaying display information received from the controller, a light source installed to project light onto the liquid crystal display device so as to adjust the display luminance level of the liquid crystal display device, and an outer side of the printer. A light receiving unit which is installed to receive external light on a surface and outputs a signal corresponding to the light receiving, and controls the light source to turn off the light source when a signal corresponding to more than the brightness set by the light receiving unit is output and is less than the brightness set by the light receiving unit And a light source controller for controlling the light source to turn on the light source when a signal corresponding to the output signal is output. According to the display control apparatus of such a printer, the power source can be reduced by turning off the light source when the light source employed to increase the display luminance level of the display device is bright and the display information can be displayed by external light. have.

Description

Display control device of printer

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display control apparatus of a printing press, and more particularly, to a display control apparatus of a printing press which can adjust power supplied to a display apparatus according to external conditions.

1 is a view showing a general printing machine.

Referring to the figure, the printer 10 is connected to a computer 1 which is an external device through a communication interface 2.

The printer 10 includes a controller 11, a memory device 12, an input device 13, a print engine 14, and a display device 20.

The controller 11 controls the overall printing press, and converts the print data received from the computer 1 into image data suitable for the print engine 14. In addition, the controller 11 processes the signal received from the input device 13 and outputs display information to the display device 20.

The display device 20 displays display information received from the controller 11.

Typically, the display device 20 applied to the printer 10 employs a light source so that the display information can be displayed to the user even in a dark room.

A display device having a liquid crystal display (LCD) generally applied to a printer is shown in FIG. 2.

Referring to FIG. 2, the display device 20 includes a liquid crystal display (LCD) 21, an LCD driver 22, a light source 23, and a light source driver 24.

The liquid crystal display device 21 includes a first polarizing plate 21a, a lower substrate 21b, a lower electrode layer 21c, a liquid crystal layer 21d, an upper electrode layer 21e, an upper substrate 21f, and a second polarizing plate 21g. Equipped with. The liquid crystal display device 21 transmits / blocks incident light as the molecular arrangement of the liquid crystal changes depending on whether an electric field is applied between the lower electrode layer 21c and the upper electrode layer 21e. The LCD driver 22 controls the lower electrode layer 21c and the upper electrode layer 21e to selectively transmit light in response to the display information input from the controller 11.

The light source 23 is provided to irradiate light toward the first polarizing plate 21a.

The light source driver 24 drives the light source 23 on / off in accordance with the control signal of the controller 11.

Since the liquid crystal display device 21 is a non-light emitting device in the display device 20 having such a structure, the printer 10 is conventionally used indoors, so that the printer 10 is always turned on. The light source 23 was also turned on.

However, there is a problem in that the light source 23 is always turned on even when the printing operation is not performed for a long time while the printer 10 is turned on, thereby wasting unnecessary power in the standby state.

On the other hand, in recent years, the work instruction corresponding to the operation of the input key in the input device 13 of the printer 10 can be controlled by the computer 1 connected to the printer 10 through the communication interface 2. Since a printer driver (not shown) is provided, the frequency of going directly to the printer 10 to view display information displayed on the printer 10 is relatively reduced except when the user goes to the printer 10 to find a printed matter. . In view of this, the conventional display device 20 driving method has a disadvantage in that unnecessary power is consumed by turning on the light source 23 of the display device 20 in addition to the case where the user approaches the display device 20.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to provide a display control apparatus of a printer which can reduce unnecessary power consumption by controlling on / off a light source of a display apparatus according to external illumination.

Another object of the present invention is to provide a display control apparatus of a printing press that can reduce unnecessary power consumption by turning on the light source of the display apparatus when the user is within a suitable distance to check the display information of the printing press.

1 is a block diagram showing a general printing press,

2 is a view illustrating in detail the display device employed in FIG. 1;

3 is a block diagram showing a display control apparatus of the printing press according to the present invention;

4 is a circuit diagram illustrating an example of a configuration of a light receiving unit of FIG. 3;

FIG. 5 is a block diagram illustrating a configuration example of the pyroelectric sensor of FIG. 3.

<Explanation of symbols for the main parts of the drawings>

1: computer 2: communication interface

10: printing machine 11, 31: controller

12: storage device 13: input device

14: printing engine 20: display device

21: LCD 22: LCD driver

23: light source 24: light source driver

32: light receiver 33: pyroelectric sensor

34: light source control unit 35: transflective film

In order to achieve the above object, a display apparatus of a printing machine according to the present invention comprises: a liquid crystal display element for displaying display information received from a controller; A light source installed to project light onto the liquid crystal display device so as to adjust the display luminance level of the liquid crystal display device; A light receiving unit installed on the outer surface of the printer to receive external light and outputting a signal corresponding to the light receiving; A light source control unit controlling the light source to turn off the light source when a signal corresponding to a brightness higher than the brightness set from the light receiving unit is output; and controlling the light source to turn on the light source when a signal corresponding to less than the brightness set from the light receiving unit is output; It is provided.

The apparatus may further include a pyroelectric sensor configured to detect heat emitted from a human body within a set effective distance installed on an outer surface of the printer and to output a human body sensing signal to the light source control unit. When the detection signal is input, it is preferable to control the light source to be turned on.

In addition, when a power saving mode signal is input from the controller, the light source control unit preferably controls the light source to turn off the light source.

Hereinafter, a display control apparatus of a printing press according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. Elements having the same function as in the above-described drawings are denoted by the same reference numerals.

Referring to the drawings, the printer is equipped with a controller 31, a memory device 12, an input device 13, a print engine 14, and a display control device 40.

The controller 31 controls the overall printing press, converts the print data received from the outside into image data suitable for the print engine 14, and outputs it to the print engine 14. The controller 31 processes the signal received from the input device 13 and controls the display control device 40.

In addition, when the time when the print data is not received from the outside exceeds the set time, the controller 31 supplies power to the print engine 14 for the purpose of reducing power consumption in the standby state until the print data is received. A power saving mode signal instructing to reduce the supply amount is output to the print engine 14. When the power saving mode signal is input, the print engine 14 supplies each device with a power set lower than that to be supplied to each device in order to immediately perform a print job.

The power saving mode signal output from the controller 31 is also output to the light source control unit 34.

The display control device 40 includes a liquid crystal display (LCD) 21, an LCD driving unit 22, a light source 23, a light receiving unit 32, a pyroelectric sensor 33, and a light source control unit 34. Although not shown, in addition to the liquid crystal display element 21 for displaying character information or image information, an indicator light adapted to display the state of the printer by light emission and extinction may be additionally provided in the printer. What is necessary is just to comprise the light source control part 34 so that it may control on / off when the indicator light is installed.

Various structures may be applied to the liquid crystal display device 21 according to the driving method, and as an example, the structure illustrated in FIG. 2 may be employed.

The LCD driver 22 controls the liquid crystal display element 21 so that the display information received from the controller 31 can be displayed by the liquid crystal display element 21 by light incident from the outside.

The light source 23 is provided opposite the image display surface of the liquid crystal display element 21.

The member provided between the light source 23 and the liquid crystal display element 21 is a transflective plate 35 formed of a material similar in transmittance and reflectance to incident light. For example, the semi-transmissive plate 35 having an incident rate and a reflectance of 50% respectively transmits 50% of the incident light and reflects 50% of the incident light.

The light source control unit 34 controls the light source 23 on / off in accordance with signals output from the controller 31, the light receiving unit 32, and the pyroelectric sensor 33. As an example, the light source control unit 34 shown in the drawing includes a noar gate 34a and a transistor 34b, and turns on the power input to the light source 23 in which the light emitting diodes are arrayed according to the signal output from the noa gate 34a. It is possible to turn on / off.

The light receiving unit 32 is installed on the outer surface of the printer and outputs a signal corresponding to the light incident from the outside to the light source control unit 34. Referring to FIG. 4 where a configuration example of the light receiving portion 32 is shown, a light receiving diode 32a and a comparator 32b are provided. The comparator 32b of the light receiving unit 32 compares the signal output from the light receiving diode 32a with the set level corresponding to the incident light, and outputs the comparison result to the light source control unit 34.

The pyroelectric sensor 33 is commonly used, and receives infrared rays corresponding to heat generated from a human body within an effective distance, and outputs the results corresponding to the received infrared rays to the light source controller 34. Referring to FIG. 5 where an example of the pyroelectric sensor 33 is illustrated, the pyroelectric sensor 33 includes a pyroelectric element 33a, a current-voltage converter (IV converter) 33b, an amplifier 33c, and a comparator ( 33d). The pyroelectric element 33a outputs a current signal corresponding to the incident infrared rays. The comparator 33d compares the voltage signal output from the pyroelectric element 33a and input through the current-voltage converter 33b and the amplifier 33c with the set voltage level, and compares the comparison result with the light source controller 34. ) When the circuit is configured as in the light source controller 34 of FIG. 3, the comparator 33d of the pyroelectric sensor 33 is configured to output a low level signal when a human body is present at a set effective distance.

The operation process of the display control apparatus of the printer having such a configuration will be described in more detail.

Each device starts when the printer is powered on.

The controller 31 of the printer controls the print engine 14 so that an image corresponding to the print data received through the communication interface (not shown) is printed on the paper. In addition, the display information is output to the LCD driver 22 so that the display information indicating the operating state of the printer is displayed on the liquid crystal display element 21.

On the other hand, when the external illuminance is bright and light above the level set in the light receiving unit 32 is incident, the light receiving unit 32 outputs a high level signal to the light source control unit 34. When the light source control unit 34 receives a high level signal from the light receiving unit, the low level signal is input to the transistor 34b via the noar gate 34a, so that the light source 23 is turned off. In this case, the external light is partially reflected by the transflective film 35 through the liquid crystal display element 21 and re-injected into the liquid crystal display element 21 to control the liquid crystal display element 21 controlled by the LCD driver 22. Displays the input display information. On the contrary, when the level of light incident on the light receiving part 32 is low and a low level signal is input from the light receiving part 32, the high level signal is input to the transistor 34b via the noah gate 34a, thereby causing the light source 23 to be input. ) Is on. In this case, the light projected by the light source 23 partially penetrates the transflective plate 35 to be incident on the liquid crystal display element 21, so that the liquid crystal display element 21 controlled by the LCD driver 22 is inputted. Display information.

On the other hand, the pyroelectric sensor 33 installed on the printer outputs a low level signal corresponding to the human body detection signal to the light source control unit 34 when a person approaches within the effective distance to detect the human body. When a low level signal is input from the pyroelectric sensor 33, the transistor 34b of the light source control unit 34 is turned on, so that the light source 23 is turned on. Unlike this, if there is no person within the effective distance capable of detecting the human body, the pyroelectric sensor 33 outputs a high level signal to the light source controller 34. When a high level signal is input from the pyroelectric sensor 33, the transistor 34 of the light source control unit 34 is turned off, so that the light source 23 is turned off.

In addition, when the print data is not received for a predetermined time from the outside, the controller 31 switches to the power saving mode to reduce power consumption. In the power saving mode, the print engine 14 supplies the print engine 14 with less power than is supplied to enable the print job. In the power saving mode, the high-level signal indicating the power saving mode is output from the controller 31 to the light source controller 34. As a result, when the power saving mode signal is input, the light source controller 34 turns off the transistor 34b to turn off the light source 23.

As described so far, according to the display control apparatus of the printer according to the present invention, the light source employed to increase the display luminance level of the display device is turned off when the external light is bright so that display information can be displayed even by external light. This has the advantage of reducing power consumption. In addition, by controlling the printer to turn on the light source when the power saving mode is performed or when there is a person within the set effective distance from the printer, power is supplied to the light source only when there is a possibility of using the display information, thereby reducing unnecessary power consumption. .

Claims (3)

A liquid crystal display element for displaying display information received from the controller; A light source installed to project light onto the liquid crystal display device so as to adjust the display luminance level of the liquid crystal display device; A light receiving unit installed on the outer surface of the printer to receive external light and outputting a signal corresponding to the light receiving; A pyroelectric sensor installed on an outer surface of the printer to sense heat emitted from a human body within a set effective distance and output a human body detection signal to the light source control unit; The light source is controlled so that the light source is turned off when a signal corresponding to a brightness higher than the brightness set by the light receiver is output. When a signal corresponding to less than the brightness set by the light receiver is output and the human body detection signal is input from the pyroelectric sensor, the light source is controlled. And a light source controller which controls the light source to be turned on. delete The method of claim 1, wherein the light source control unit, And the light source is controlled to turn off the light source when a power saving mode signal is input from the controller.