JPH10202844A - Liquid crystal display device in printer and controlling method of operation of backlight thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prolong the life of a backlight by extinguishing or flickering the backlight in a plate making operation and/or a printing operation. SOLUTION: On standby for printing, a backlight is lighted according to an operation signal from a control means. When a signal from a plate making operation detecting means is inputted, the control means judges that plate making is in progress (S1) and changes the operation signal for the backlight. At the time when the signal from the plate making operation detecting means is not inputted, the control means judges the presence or absence of a signal of a printing operation detecting means, and when the signal from the printing operation detecting means is inputted, it judges that printing is in progress (S2) and changes the operation signal for the backlight. By this change of the operation signal, the backlight is extinguished or lighted on the basis of an operation program (S3). In the case when the signals from the plate making and printing operation detecting means are not inputted, the operation signal sent to the backlight from the control means is not changed and the backlight is kept in a state of being lighted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling a printing apparatus, and more particularly, to a method for controlling the operation of a liquid crystal display and a backlight used in the liquid crystal display.

[0002]

2. Description of the Related Art Recently, a liquid crystal display (hereinafter, referred to as an LCD) has been adopted for an operation panel of a printing apparatus as well as a copying apparatus and a facsimile apparatus. This LCD is advantageous in terms of miniaturization as compared with a CRT (cathode ray tube) and is often used because it is inexpensive as compared with a plasma display. Is low and difficult to see. In order to solve this problem, a configuration is employed in which a backlight is emitted behind a transflective or transmissive LCD, whereby sufficient brightness can be secured and an easy-to-view display can be performed. ing.

[0003]

As the backlight, an LED, an EL plate, or the like is used. However, since the cost of recent printing apparatuses has been reduced, an inexpensive EL plate tends to be used. However, when the life of the LED is compared with the life of the EL plate, the LED is about 30,000 hours, whereas the EL is about 30,000 hours.
The plate is as short as 3,000 to 5,000 hours, and there is a problem that maintenance work is required when an EL plate is used.

[0004] In addition, there are few opportunities for the user to confirm the display on the liquid crystal display device during the operation of the printing apparatus.
Regardless of which EL plate is used, it is preferable to turn off the backlight when there is little opportunity to confirm the display, in order to extend the life of the backlight.

SUMMARY OF THE INVENTION The present invention provides a backlight operation control method for extending the life of a backlight in a liquid crystal display device of a printing apparatus.

[0006]

According to the first aspect of the present invention,
In a printing apparatus provided with a liquid crystal display device having a backlight, the backlight is turned off or blinks during a plate making operation and / or a printing operation.

According to a second aspect of the present invention, there is provided a printing apparatus including a liquid crystal display device having a backlight and an operation command key for outputting an operation signal to a printing apparatus main body, during a plate making operation and / or during a printing operation. The backlight is turned off or blinks, and the backlight is turned on when the operation signal is output during a plate making operation and / or a printing operation.

According to a third aspect of the present invention, there is provided a liquid crystal display device having a backlight, and abnormality detecting means for detecting an abnormality when the main body of the printing apparatus is operated and outputting an abnormality signal. In the printing apparatus, the backlight may be turned off or blinked during the plate making operation and / or the printing operation, and the backlight may be turned on when the abnormal signal is output during the plate making operation and / or the printing operation. Features.

According to a fourth aspect of the present invention, there is provided a liquid crystal display device having a backlight, and abnormality detecting means for detecting an abnormality when the printing apparatus main body is in operation and outputting an abnormality signal. In a printing apparatus, the backlight is turned off or blinks at a first interval during a plate making operation and / or a printing operation, and the backlight is output when the abnormal signal is output during a plate making operation and / or a printing operation. Blink at a second interval.

According to a fifth aspect of the present invention, there is provided a method for controlling the operation of a backlight of a liquid crystal display device in a printing apparatus according to any one of the first to fourth aspects. The backlight is turned on immediately before or immediately after the end.

According to a sixth aspect of the present invention, there is provided a method of controlling the operation of a backlight of a liquid crystal display device in a printing apparatus according to any one of the first to fifth aspects, further comprising: Can be controlled according to the state of the printing apparatus main body.

According to a seventh aspect of the present invention, there is provided a method for controlling the operation of a backlight of a liquid crystal display device in a printing apparatus according to any one of the first to sixth aspects. The backlight is turned off after being left for a predetermined time.

According to an eighth aspect of the present invention, there is provided a method of controlling operation of a backlight of a liquid crystal display device in a printing apparatus according to any one of the first to seventh aspects, further comprising: The backlight is arbitrarily switched on and off in preference to changing the operation state of the backlight according to each operation.

According to a ninth aspect of the present invention, in the method for controlling the operation of a backlight of a liquid crystal display device in a printing apparatus according to any one of the first to eighth aspects, the liquid crystal display device further comprises: It has a plurality of display areas, a plurality of the backlights are provided corresponding to the plurality of display areas, and the operations of the plurality of backlights are individually controlled.

According to a tenth aspect of the present invention, in the operation control method of the backlight of the liquid crystal display device in the printing apparatus according to the ninth aspect, the backlight is further configured to be color-coded.

According to an eleventh aspect of the present invention, there is provided a printing apparatus including a liquid crystal display device having a backlight, wherein the backlight is turned off or blinks during a plate making operation and / or a printing operation, and the liquid crystal display device has The display is erased.

According to a twelfth aspect of the present invention, in a printing apparatus provided with a liquid crystal display device having a backlight, the backlight is turned off or blinks during a plate making operation and / or a printing operation, and the liquid crystal display device is provided with a backlight. The display is changed from the display in standby.

According to a thirteenth aspect of the present invention, there is provided a liquid crystal display device having a backlight, various keys for outputting a signal to the printing apparatus main body, and detecting an abnormality when the printing apparatus main body has an abnormality to generate an abnormality signal. In a printing apparatus having an abnormality detecting means for outputting, the backlight is turned off after leaving the printing apparatus main body for a predetermined time, and when the various keys are pressed and the signal is output at the time of turning off the light, or When the abnormality detecting means detects the abnormality and outputs the abnormality signal, the backlight is turned on.

[0019]

FIG. 1 shows a liquid crystal display (hereinafter referred to as LC) of a stencil printing apparatus as a printing apparatus employing an embodiment of the present invention.
D) and a control means 1 for controlling the backlight.

The control means 1, which is a well-known microcomputer having a built-in timer 2, includes an operation panel 3, an abnormality detecting means 4, a detecting means 5 during prepress operation, a detecting means 6 immediately before the end of prepress operation, a detecting means 7 during printing operation, Signals from the detection unit 8 immediately before the end of the printing operation and the brightness detection unit 14 are input, and signals are output to the operation panel 3 and the backlight 9, respectively. A plurality of programs for controlling the operation of the backlight 9 and the LCD 13 are stored inside the control means 1.

The timer 2 operates as a blinking timer that advances in accordance with the turning on of the blinking flag during a blinking process of the backlight 9 to be described later. It operates as an abandon timer that advances along with.

An operation signal from an operation command key 10 and a signal from a backlight lighting change-over switch 11 are input to an operation panel 3 having a controller (not shown) built in. The operation panel 3 receives a signal from a display IC 12 via a display IC 12. LC
A display signal is output to D13, and an operation signal is output to control means (not shown) for controlling the operation of the printing apparatus main body.

The abnormality detecting means 4 is provided in the printing apparatus main body, and includes sensors, a plate making section, a plate discharging section, a sheet feeding section, a sheet discharging section, a printing section, etc., which are disposed in the master transport path and the sheet transport path. , And outputs a signal when the paper or the master is jammed in the apparatus, when the drive unit does not operate, or when the cover is opened.

The plate making operation detecting means 5 is a sensor for monitoring the operation of each of the master conveying means for conveying the master and the plate cylinder driving means for rotatingly driving the plate cylinder, and outputs a signal together with the start of the operation of the master conveying means. Is started, and the output of the signal is stopped when the plate cylinder driving means stops after the master transport means stops.

The detection means 6 immediately before the end of the plate making operation is a sensor for monitoring the operation of each of the master conveying means and the cutting means for cutting the master, and starts outputting a signal together with the operation of the master conveying means. Stops signal output at the start of operation.

The printing operation detecting means 7 is a sensor for monitoring the operation of each of the sheet feeding means for feeding paper and the plate cylinder driving means, and starts outputting a signal when the operation of the sheet feeding means is started. The output of the signal is stopped when the body driving means is stopped.

The detection means 8 immediately before the end of the printing operation is a sensor for monitoring the operation of the paper feeding means, outputs a signal when the paper feeding means is activated at the start of printing, and the paper feeding means detects the last one.
The signal output is stopped before the sheet is fed.

The brightness detecting means 14 is a known sensor for detecting the brightness of the atmosphere in which the apparatus main body is placed.

The operation command key 10 includes a plate making start key and a printing start key, and the operation command key pressed during the plate making operation or the printing operation includes a stop key.

A backlight lighting change-over switch 11, which is a select switch, is provided on the operation panel 3, and selectively operates the backlight 9 to one of "lighting", "light-out", and "automatic". Switch.

FIG. 2 is a schematic diagram of the backlight 9 and the LCD 13 used in the present embodiment. LCD13
Are a substrate 13a, frames 13b, 13b, a liquid crystal cover 13c, a liquid crystal 13d, a reflection plate 13e, and an entire cover 13f.
From the substrate 13a side.
e, a liquid crystal 13d, and a liquid crystal cover 13c in this order, and are fixed to the substrate 13a by frames 13b, 13b.

An E is provided between the substrate 13a and the reflection plate 13e.
A backlight 9 made of an L plate is provided. The backlight 9 is connected to the control unit 1 via an inverter (not shown).
It is connected to the. In addition, this backlight 9 is LC
When D13 has a plurality of display areas, as shown by broken lines in FIG. 1, they are arranged according to the display areas.

Based on the above configuration, the operation will be described below with reference to the flowchart for each claim of the present application.

First, the operation in claim 1 will be described based on the flowcharts shown in FIGS. 3, 4 and 5. FIG.
Indicates a case where the backlight 9 is turned off or blinks during the plate making operation and / or the printing operation. This operation program is arbitrarily selected by a mode selection key (not shown) provided on the operation panel 3, and whether to turn off or blink the backlight 9 is selected at the same time. In this case, the backlight lighting changeover switch 11
Is switched to "automatic".

While the printing apparatus is on standby, the backlight 9 is turned on by an operation signal from the control means 1. Then, when a signal is input from the plate making operation detecting unit 5, the control unit 1 determines that plate making is in progress (step 1) and changes the operation signal to the backlight 9. Control means 1
Determines whether there is a signal from the printing operation detecting means 7 when a signal from the plate making operation detecting means 5 is not input, and determines that printing is being performed when a signal from the printing operation detecting means 7 is input. Then (step 2), the operation signal to the backlight 9 is changed. Due to the change of the operation signal, the backlight 9 is turned off or blinked based on the operation program (step 3). If a signal is not input from the plate making operation detecting means 5 or the printing operation detecting means 7,
The operation signal from the control means 1 to the backlight 9 is not changed, and the backlight 9 maintains a state in which it is lit.
When the plate making operation or the printing operation is completed and the signal output from the plate making operation detecting means 5 or the printing operation detecting means 7 to the control means 1 is interrupted, the control means 1 sends an operation signal to the backlight 9. Again to change the backlight 9
Lights up.

FIG. 4 shows the case where the backlight 9 is turned off or blinks during the plate making operation (step 4) (step 5), and FIG. 5 shows the case where the backlight 9 is turned on during the printing operation (step 6).
Are turned off or blinked (step 7). Similarly to the above, the operation program and whether to turn off or blink the backlight 9 are arbitrarily selected by a mode selection key (not shown) provided on the operation panel 3, and the backlight lighting changeover switch 11 is also switched to "automatic". Can be

By controlling the operation of the backlight 9 in this manner, the LCD 1 can be operated during a plate making operation or a printing operation.
By turning off the backlight 9 in a situation where there is little opportunity to check the screen 3, the life of the backlight 9 can be extended, and by blinking the backlight 9 during operation, the apparatus main body is operating. At a glance.

Next, the operation in claims 2 and 3 will be described based on the flowcharts shown in FIGS. FIG.
Indicates a subroutine of the plate making operation in steps 1 and 4. If the operation command key (stop key) 10 is pressed and this signal is input to the operation panel 3 while the plate making operation is being detected by the plate making operation detecting means 5 (step 8), the operation is started. Panel 3
Sends a signal to the control means 1. The control means 1 determines that the operation command key 10 has been pressed (step 9), changes the operation signal to the backlight 9, and turns off the backlight 9 which has been turned off or blinking. The light is turned on (step 10). Also,
If the cover is opened or an abnormality occurs during the plate making operation, the abnormality detecting means 4 detects the abnormality and sends a signal to the control means 1, and when the control means 1 recognizes this (step 1).
1, step 12), the operation signal from the control means 1 is changed, and the backlight 9 is turned on. If a signal from the operation panel 3 or the abnormality detection means 4 is not input to the control means 1, the plate making operation is continued (step 13), and a signal from the plate making operation detection means 5 is continuously input to the control means 1.

FIG. 7 shows a subroutine of the print processing operation in steps 2 and 6. When the operation command key 10 is pressed and this signal is input to the operation panel 3 while the printing operation is being detected by the printing operation detection means 7 (step 14), control is performed from the operation panel 3. A signal is sent to the means 1, and the control means 1 determines that the operation command key 10 has been pressed (step 15), changes the operation signal to the backlight 9, and turns on the backlight 9 which has been turned off or blinking. (Step 16). If the cover is opened or an abnormality occurs during the printing operation, the abnormality detecting means 4 detects the abnormality and sends a signal to the control means 1, and the control means 1 recognizes this (step 1).
7, step 18), the operation signal from the control means 1 is changed, and the backlight 9 is turned on. If a signal from the operation panel 3 or the abnormality detection means 4 is not input to the control means 1, the printing operation is continued (step 19), and a signal from the printing operation detection means 7 is continuously input to the control means 1.

By controlling the operation of the backlight 9 in this manner, the LCD 1 can be operated during a plate making operation or a printing operation.
By turning off the backlight 9 in a situation where there is little opportunity to check the screen 3, the life of the backlight 9 can be extended, and by blinking the backlight 9 during operation, the apparatus body is operating. This can be confirmed at a glance, and the next operation can be quickly performed by turning on the backlight 9 when an abnormality occurs or when the apparatus is stopped by pressing the stop key.

Next, the operation of claim 4 will be described with reference to the flowcharts shown in FIGS. 8, 9, 10 and 11. FIG. 8 shows a subroutine of the plate making operation in steps 1 and 4. If the cover is opened or an abnormality occurs while the plate making operation is being detected by the plate making operation detecting means 5 (step 20), the abnormality detecting means 4 detects this and the control means 1 When the control means 1 recognizes this (step 2).
1, step 22), the operation signal from the control means 1 is changed, and the backlight 9 blinks (step 23). If the signal from the abnormality detecting means 4 is not input to the control means 1, the plate making operation is continued (step 24), and the signal from the plate making operation detecting means 5 is continuously input to the control means 1.

FIG. 9 shows a subroutine of the print processing operation in steps 2 and 6. If the cover is opened or an abnormality occurs while the printing operation is being detected by the printing operation detecting means 7 (step 25), the abnormality detecting means 4 detects this and controls the control means 1. When the control means 1 recognizes this (steps 26 and 27), the operation signal from the control means 1 is changed and the backlight 9 blinks (step 2).
8). If the signal from the abnormality detecting means 4 is not input to the control means 1, the printing operation is continued (step 29).
The signal from the detection unit 7 during the printing operation is continuously input to the control unit 1.

FIG. 10 shows a subroutine of the backlight blinking operation in steps 3, 5, and 7. The backlight blinking process is performed at predetermined time intervals while a signal from the plate making operation detecting unit 5 or the printing operation detecting unit 7 is being input to the control unit 1.

The control means 1 determines whether a signal has been input from the plate making operation detecting means 5 or the printing operation detecting means 7 (step 30). If it is determined that no signal has been input, the flashing flag is set. The flash timer is cleared without being turned on (step 31), and when it is determined that a signal is input, the flash flag is turned on and the flash timer is advanced (step 32).

Next, the value of the blinking timer is compared with a preset sum of the first on-time and the first off-time (step 33), and the value of the blinking timer is compared with the first on-time and the first on-time.
If the sum exceeds the off time, the blink timer is cleared (step 35). If the value of the blink timer is less than the sum of the first on-time and the first off-time, then this value is compared with the first on-time (step 36), and the value of the blink timer is changed to the first on-time. The backlight 9 is turned on when the value falls below (step 37), and the backlight 9 is turned off when the value exceeds the value (step 34).

By repeating this operation at predetermined time intervals, the backlight 9 emits the first flashing light including the first lightening interval X1 and the first lightening interval X2 as shown by the solid line in FIG. The blinking operation is performed at the interval X.

FIG. 11 shows a subroutine of the backlight blinking operation in steps 23 and 28. The backlight blinking process is performed at predetermined time intervals while a signal from the abnormality detection unit 4 is being input to the control unit 1.

The control means 1 determines whether a signal from the abnormality detecting means 4 has been input (step 38), and if it determines that no signal has been input, clears the flashing timer without turning on the flashing flag. (Step 39) When it is determined that a signal has been input, the blink flag is turned on and the blink timer is advanced (Step 40).

Next, the value of the blink timer is compared with the sum of a second on-time and a second off-time, which is different from the preset sum of the first on-time and the first off-time (step S1). 41) When the value of the blink timer exceeds the sum of the second on-time and the second off-time, the blink timer is cleared (step 43). If the value of the blinking timer falls below the sum of the second on-time and the second off-time, then this value is compared with the second on-time (step 44), and the value of the blinking timer is changed to the second on-time. If the time is less than the time, the backlight 9 is turned on (step 45). If the time is less than the time, the backlight 9 is turned off (step 42).

By repeating this operation at predetermined time intervals, the backlight 9 emits a second blink, which is the sum of the second blink interval Y1 and the second blink interval Y2, as shown by the broken line in FIG. The blinking operation is performed at the interval Y.

By controlling the operation of the backlight 9 in this way, the state of the backlight 9 can be changed at a glance according to the respective states during standby of the apparatus, during stencil printing operation, and during abnormal stop. The state of the device can be grasped.

In this embodiment, the blinking interval of the backlight 9 is the same during the plate making operation and during the printing operation. However, by changing the program of the control means 1, these intervals can of course be made different. It is.

Next, the operation of claim 5 will be described with reference to the flowcharts shown in FIGS. FIG.
3 shows a subroutine of a plate making process operation in steps 1, 4, 8, and 20. In the plate making operation, first, a plate discharging operation for separating the used master from the peripheral surface of the plate cylinder is performed (step 46).
A stencil transport operation for transporting the master while making the stencil is performed (step 47). At this time, at the same time as the start of the operation of the master transport unit, signals from the plate making operation detecting unit 5 and the plate making operation immediately before completion detecting unit 6 are output to the control unit 1.
Control means 1 receiving a signal from plate making operation detecting means 5
Changes the operation signal to the backlight 9 to turn off or blink the backlight 9. Then, when the cutting means is operated to cut the master in accordance with a command from the control means for controlling the operation of the apparatus main body (step 48), the output of the signal from the detection means 6 immediately before the end of the prepress operation to the control means 1 is stopped. . When the signal from the detection means 6 immediately before the end of the plate making operation is interrupted, the control means 1 changes the operation signal to the backlight 9 again to turn on the backlight 9 (step 4).
9). Thereafter, the master winding operation is performed (step 50), and the apparatus main body enters a printing standby state.

FIG. 14 shows a subroutine of the print processing operation in step 2, step 6, step 14 and step 25. While the printing operation is being detected by the printing operation detecting means 7 (step 5).
1) The control unit 1 detects whether the printing is one sheet before the end of the printing operation based on a signal from the detection unit 8 immediately before the end of the printing operation (step 52). Then, the signal output from the detection unit 8 immediately before the end of the printing operation to the control unit 1 is interrupted,
When the control unit 1 recognizes that the printing is one sheet before the end, the control unit 1 changes the operation signal to the backlight 9 and turns on the backlight 9 (step 53). If a signal has been output from the detection means 8 immediately before the end of the printing operation to the control means 1, the printing process is continued (step 54).

By controlling the operation of the backlight 9 in this way, it is possible to recognize immediately before the completion of the plate making operation and the printing operation, so that the next operation can be prepared and the apparatus main body can be operated by the next user. Be ready to give up.

Next, the operation of claim 6 will be described with reference to the flowcharts shown in FIGS. FIG.
The case where the turning on and off of the backlight 9 is controlled according to the brightness of the atmosphere during standby is shown. The control means 1
The brightness level detected by the brightness detecting means 14 is compared with a stored reference value (step 55), and when the detected brightness level falls below the reference value, the backlight 9 is turned on (step 56). When the value exceeds the reference value, the backlight 9 is turned off (step 5).
7).

FIG. 16 shows steps 3, 5, 5, 7, 10, 16, 23,
The subroutine of the backlight illuminance control processing in steps 28, 49, 53 and 56 is shown.

The control means 1 confirms that a signal from the plate making operation detecting means 5 or the printing operation detecting means 7 has been inputted, and further judges whether a signal from the abnormality detecting means 4 has been inputted. (Step 58). When the signal from the abnormality detecting means 4 is input, the backlight 9 is turned on or blinked according to the program (step 59), and the illuminance of the backlight 9 is set to the stopped illuminance (step 60). .

When the signal from the abnormality detecting means 4 is not inputted, the control means 1 judges whether the signals are inputted from the detecting means 5 during the plate making operation and the detecting means 6 just before the end of the plate making operation ( Step 61) If both signals are input, it is determined that the prepress operation is being performed. next,
It is determined whether or not the mode for blinking the backlight 9 is selected by the mode selection key (step 62). If the mode for blinking is selected, the backlight 9 is caused to blink at the illuminance during plate making (step 63). . When only the signal from the plate-making operation detecting means 5 is input, it is determined that it is immediately before the end of the plate-making operation, and the backlight 9 is turned on with the illuminance during the plate-making operation.

If the signal from the plate making operation detecting means 5 is not input, the control means 1 determines whether the signals from the printing operation detecting means 7 and the printing operation end detecting means 8 are input. Then, when both signals are input, it is determined that the printing operation is being performed.
Next, it is determined whether the mode for blinking the backlight 9 is selected by the mode selection key (step 6).
5) If the blinking mode is selected, the backlight 9 blinks at the illuminance during printing (step 6).
6). If only the signal from the printing operation detection means 7 is input, it is determined that the printing operation is just before the end of the printing operation, and the backlight 9 is turned on with the illuminance during printing.

If no signal has been input from the plate making operation detecting means 5 or the printing operation detecting means 7, the control means 1 determines that the apparatus main body is on standby (step 67). Then, the brightness level detected by the brightness detecting means 14 is compared with a reference value stored in advance (step 68), and when the detected brightness level falls below the reference value, the backlight 9 is turned on in standby illumination. The light is turned on (step 69).

In this backlight illuminance control process,
The adjustment of the illuminance of the backlight 9 is performed by changing the frequency to an inverter (not shown). By controlling the operation of the backlight 9 in this manner, the state of the apparatus main body can be grasped at a glance.

Next, the operation of claim 7 will be described with reference to the flowchart shown in FIG. FIG. 17 shows control for automatically turning off the backlight 9 when no key operation is performed for a predetermined time during standby, and turning on the backlight 9 when a key operation is performed.

The control means 1 determines whether or not the apparatus main body is on standby based on the presence / absence of a signal input from the plate making operation detecting means 5 or the printing operation detecting means 7 (step 70). When there is no signal from each of the detection means 5 and 7, and it is determined that the apparatus main body is on standby, the control means 1
It is determined whether or not various keys including the operation command key 10 on the operation panel 3 have been operated (step 71). If the key has been operated, the backlight 9 is turned on (step 72) and the idle timer is cleared. (Step 7
3). If the key is not operated, the idle timer is advanced (step 74), the value of the idle timer is compared with a preset reference time (step 75), and if the value of the idle timer exceeds the reference time. Then, the backlight 9 is turned off (step 76).

By controlling the operation of the backlight 9 as described above, the backlight 9 can be automatically turned off when the apparatus is not used, and the life of the backlight 9 can be extended.

Next, the operation of claim 8 will be described with reference to the flowchart shown in FIG. FIG. 18 shows control for turning on and off the backlight 9 regardless of whether the apparatus main body is on standby or in operation.

The control means 1 receives a signal from the backlight lighting change-over switch 11 via the operation panel 3. The signal from the backlight lighting change-over switch 11 has priority over the signals from all other detection means. The control means 1 first determines whether or not this signal is "lighting" (step 77), and if it is "lighting", turns on the backlight 9 (step 78). If the signal is not "lit", the control means 1 next determines whether this signal is "off" (step 79), and if "off", turns off the backlight 9 (step 80). ). If the signal is neither "lit" nor "off", the control means 1 determines that the signal is "automatic" (step 81), and the operation of the backlight 9 is controlled based on the above-described operation programs. You.

By controlling the operation of the backlight 9 in this way, it is possible to widely meet the needs of the user.

Further, as shown in claims 9 and 10, the LCD 13 may have a plurality of display areas, and in this case, the backlight 9 provided corresponding to each display area may be provided. The operation can be controlled by different operation programs. Thereby, the operability of the printing apparatus can be improved. Further, by using the plurality of backlights 9 of two or more colors, the operability of the printing apparatus can be further improved.

Next, the operation of claim 11 will be described with reference to FIG.
This will be described with reference to the flowcharts shown in FIGS.
FIG. 19 shows a case where the backlight 9 is turned off or blinks and the display of the LCD 13 is erased during the plate making operation and / or the printing operation. This operation program is arbitrarily selected by a mode selection key (not shown) provided on the operation panel 3, and whether to turn off or blink the backlight 9 is selected at the same time. In this case, the backlight lighting changeover switch 11 is switched to "automatic".

While the printing apparatus is on standby, the backlight 9 is turned on by the operation signal from the control means 1 (step 82), and the LCD 13 displays the stencil printing conditions and the state of the apparatus main body based on the signal from the control means 1. Are displayed (step 83). When the signal from the plate-making operation detecting unit 5 is input, the control unit 1 determines that plate-making is in progress (step 84), and outputs the operation signal to the backlight 9 and the LCD.
13 respectively. Control means 1
Determines whether there is a signal from the printing operation detecting means 7 when a signal from the plate making operation detecting means 5 is not input, and determines that printing is being performed when a signal from the printing operation detecting means 7 is input. Then, the operation signal to the backlight 9 and the signal to the LCD 13 are changed respectively (step 85).
By this change of the operation signal, the backlight 9 is turned off or blinked based on the operation program (step 8).
6) The display of the LCD 13 is deleted (step 8).
7). When a signal from the plate making operation detecting means 5 or the printing operation detecting means 7 is not inputted, the operation signal from the control means 1 to the backlight 9 and the signal to the LCD 13 are not changed, and the backlight 9 is turned on. The LCD 13 maintains the condition display. When the plate making operation or the printing operation is completed and the signal output from the plate making operation detecting means 5 or the printing operation detecting means 7 to the control means 1 is interrupted, the control means 1 sends an operation signal to the backlight 9. Then, the signal to the LCD 13 is changed again to turn on the backlight 9 and cause the LCD 13 to display a condition.

FIG. 20 shows that the backlight 9 is turned on during standby (step 88) and the LCD 13 displays conditions (step 89), and during the prepress operation (step 90).
Turns off or blinks the backlight 9 (step 9).
The display on the LCD 13 is erased together with 1) (step 9).
FIG. 21 shows the case where the backlight 9 is turned on during standby (step 93) and the LCD 13 displays a condition (step 94) during a standby state (step 95).
Turns off or blinks the backlight 9 (step 9).
6) and erase the display on the LCD 13 (step 9).
7) Each case is shown. Similarly to the above, the operation program and whether to turn off or blink the backlight 9 are arbitrarily selected by a mode selection key (not shown) provided on the operation panel 3, and the backlight lighting changeover switch 11 is also switched to "automatic". Can be

As described above, the backlight 9 and the LCD 13
, The backlight 9 is turned off and the display on the LCD 13 is turned off in a situation where there is little opportunity to check the screen of the LCD 13 such as during a plate making operation or a printing operation, thereby extending the life of the backlight 9. By extending the power, the power consumption can be suppressed, and by blinking the backlight 9 during operation, it can be confirmed at a glance that the apparatus main body is operating.

Next, the operation in claim 12 will be described with reference to FIG.
This will be described with reference to the flowcharts shown in FIGS.
FIG. 22 shows a case where the backlight 9 is turned off or blinks during the plate making operation and / or the printing operation, and the display of the LCD 13 is changed. This operation program is arbitrarily selected by a mode selection key (not shown) provided on the operation panel 3, and whether to turn off or blink the backlight 9 is selected at the same time. In this case also, the backlight lighting changeover switch 11 is switched to “automatic”.

While the printing apparatus is on standby, the backlight 9 is turned on by an operation signal from the control means 1 (step 98), and the LCD 13 displays the stencil making conditions and the state of the apparatus main body based on the signal from the control means 1. Are displayed (step 99). When the signal from the plate making operation detecting unit 5 is input, the control unit 1 determines that plate making is in progress (step 100), and outputs the operation signal to the backlight 9 and the LC.
The signal to D13 is changed respectively. Control means 1
Determines whether there is a signal from the printing operation detecting means 7 when a signal from the plate making operation detecting means 5 is not input, and determines that printing is being performed when a signal from the printing operation detecting means 7 is input. Then, the operation signal to the backlight 9 and the signal to the LCD 13 are changed respectively (step 101). Due to the change of the operation signal, the backlight 9 is turned off or blinked based on the operation program (step 1).
02), the display of the LCD 13 is changed to "operating" (step 103). When a signal is not input from the plate making operation detecting unit 5 or the printing operation detecting unit 7, the operation signal from the control unit 1 to the backlight 9 and L
The signal to the CD 13 is not changed, the backlight 9 is lit, and the LCD 13 maintains the condition display.
When the plate making operation or the printing operation is completed and the signal output from the plate making operation detecting means 5 or the printing operation detecting means 7 to the control means 1 is interrupted, the control means 1 sends an operation signal to the backlight 9. And the signal to the LCD 13 is changed again so that the backlight 9 is turned on.
13 displays a condition.

FIG. 23 shows that the backlight 9 is turned on during standby (step 104) and the LCD 13 displays conditions (step 105).
At step 06), the backlight 9 is turned off or blinks (step 107) and the display on the LCD 13 is changed to "during plate making" (step 108). In FIG. 24, the backlight 9 is turned on during standby (step 109). ) Is displayed on the LCD 13 (step 110).
During the printing operation (step 111), the backlight 9 is turned off or blinks (step 112) and the LCD 13
Is changed to "printing" (step 113). Similarly to the above, the operation program and whether to turn off or blink the backlight 9 are arbitrarily selected by a mode selection key (not shown) provided on the operation panel 3, and the backlight lighting changeover switch 11 is also switched to "automatic". Can be

As described above, the backlight 9 and the LCD 13
The backlight 9 is turned off and the LCD 13 is turned off in a situation where there is little opportunity to check the screen of the LCD 13, such as during a plate making operation or a printing operation.
By changing the display according to the state of the device body,
Extending the life of the backlight 9 and reducing power consumption,
Further, the state of the apparatus main body can be grasped at a glance, and by blinking the backlight 9 during operation, it can be more easily confirmed that the apparatus main body is operating.

Next, the operation of claim 13 will be described with reference to the flowchart shown in FIG. FIG. 25 shows control for automatically turning off the backlight 9 during standby and turning on the backlight 9 when a key operation is performed, when the cover is opened, or when an abnormality is detected. I have.

The control means 1 determines whether or not the apparatus main body is on standby based on the presence / absence of a signal input from the plate making operation detecting means 5 or the printing operation detecting means 7 (step 114). There is no signal from each detecting means 5 and 7,
When it is determined that the apparatus main body is on standby, the control unit 1
Determines whether various keys including the operation command key 10 on the operation panel 3 have been operated (step 115). When the key has been operated, the backlight 9 is turned on (step 116) and the idle timer is set. Clear (step 117). If the key is not operated, it is determined whether the cover is opened next (step 11).
8) If the cover is opened, proceed to steps 116 and 117. The determination at this time is not to determine whether the cover is in the open state, but to determine whether the cover has changed from the closed state to the open state. If the cover is not opened, it is next determined whether or not an abnormality has occurred (step 119). If an abnormality has occurred, steps 116 and 1 are performed in the same manner as described above.
Proceed to 17. The determination at this time also does not determine whether the state is in the state where the abnormality has occurred, but whether the state has changed from the normal state to the abnormal state. If no abnormality occurs, the idle timer is advanced (step 1).
20), the value of the idle timer is compared with a preset reference time (step 121), and if the value of the idle timer exceeds the reference time, the backlight 9 is turned off (step 122).

By controlling the operation of the backlight 9 as described above, the backlight 9 can be automatically turned off when the apparatus is not used, so that the life of the backlight 9 can be extended and the cover can be opened. By turning on the backlight 9 when it is touched or when an abnormality occurs,
It is possible to quickly perform an abnormal recovery operation, grasp an abnormal state, and the like. Since the determinations in steps 118 and 119 both monitor changes in the state, the backlight 9 is turned on temporarily.

[0081]

According to the first aspect of the present invention, the life of the backlight is extended by turning off the backlight in a situation where there is little opportunity to check the screen of the liquid crystal display device, such as during a plate making operation or a printing operation. By blinking the backlight during the operation, it is possible to confirm at a glance that the apparatus main body is operating.

According to the second aspect of the present invention, it is possible to extend the life of the backlight by turning off the backlight in a situation where there is little opportunity to check the screen of the liquid crystal display device, such as during a plate making operation or a printing operation. It is possible to confirm at a glance that the main body of the device is operating by blinking the backlight during operation.In addition, when the device is stopped by pressing an operation command key such as a stop key, the backlight is turned on. The following operation can be performed quickly by turning on the light.

According to the third aspect of the invention, it is possible to extend the life of the backlight by turning off the backlight in a situation where there is little opportunity to check the screen of the liquid crystal display device, such as during a plate making operation or a printing operation. It is also possible to confirm at a glance that the device itself is operating by blinking the backlight during operation, and to turn on the backlight when the device stops in the event of an abnormality. Operation can be performed quickly.

According to the fourth aspect of the invention, the state of the backlight can be changed according to the states of the apparatus during standby, during plate-making printing operation, and during abnormal stop, and the state of the apparatus can be grasped at a glance. can do.

According to the fifth aspect of the present invention, a plate making operation,
The end of the printing operation can be recognized immediately before,
It is possible to prepare for the next operation or to give up the apparatus body to the next user. Also, by turning on the backlight immediately after the end of the plate making operation and printing operation,
The following operations can be performed quickly.

According to the sixth aspect of the present invention, the state of the apparatus main body can be grasped at a glance by the difference in the illuminance of the backlight.

According to the invention of claim 7, the backlight can be automatically turned off when the device is not used,
The life of the backlight can be extended.

According to the eighth aspect of the present invention, it is possible to provide a liquid crystal display device in a printing apparatus that can widely meet user needs.

According to the ninth aspect, the operability of the printing apparatus can be improved.

According to the tenth aspect, the operability of the printing apparatus can be further improved.

According to the eleventh aspect, the backlight is turned off and the display of the liquid crystal display device is erased in a situation where there is little opportunity to check the screen of the liquid crystal display device, such as during a plate making operation or a printing operation. It can extend the life of the backlight and reduce power consumption,
By blinking the backlight during operation, it is possible to confirm at a glance that the apparatus main body is operating.

According to the twelfth aspect of the present invention, the backlight is turned off and the display of the liquid crystal display device is displayed on the main body of the device in a situation where there is little opportunity to check the screen of the liquid crystal display device, such as during a plate making operation or a printing operation. It can extend the life of the backlight and reduce the power consumption by changing it according to the state of the device, and can grasp the status of the device at a glance.Also, by blinking the backlight during operation, It is possible to more easily confirm that the main body is operating.

According to the thirteenth aspect of the present invention, the backlight can be automatically turned off when the apparatus is not used, and the life of the backlight can be extended, and
By temporarily turning on the backlight when the cover is opened, when an abnormality occurs, or the like, it is possible to quickly perform an abnormality recovery work, grasp an abnormal state, and the like.

[Brief description of the drawings]

FIG. 1 is a control block diagram of a liquid crystal display device and its backlight in a printing apparatus according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a liquid crystal display device used in an embodiment of the present invention and its backlight.

FIG. 3 is a flowchart illustrating an operation according to an embodiment of the present invention.

FIG. 4 is a flowchart illustrating an operation according to an embodiment of the present invention.

FIG. 5 is a flowchart illustrating an operation according to an embodiment of the present invention.

FIG. 6 is a flowchart illustrating an operation according to an embodiment of the present invention.

FIG. 7 is a flowchart illustrating an operation according to an embodiment of the present invention.

FIG. 8 is a flowchart illustrating an operation according to an embodiment of the present invention.

FIG. 9 is a flowchart illustrating an operation according to an embodiment of the present invention.

FIG. 10 is a flowchart illustrating an operation according to an embodiment of the present invention.

FIG. 11 is a flowchart illustrating an operation according to an embodiment of the present invention.

FIG. 12 is a timing chart illustrating the operation of the backlight according to one embodiment of the present invention.

FIG. 13 is a flowchart illustrating an operation according to an embodiment of the present invention.

FIG. 14 is a flowchart illustrating an operation according to an embodiment of the present invention.

FIG. 15 is a flowchart illustrating an operation according to an embodiment of the present invention.

FIG. 16 is a flowchart illustrating an operation according to an embodiment of the present invention.

FIG. 17 is a flowchart illustrating an operation according to an embodiment of the present invention.

FIG. 18 is a flowchart illustrating an operation according to an embodiment of the present invention.

FIG. 19 is a flowchart illustrating an operation according to an embodiment of the present invention.

FIG. 20 is a flowchart illustrating an operation according to an embodiment of the present invention.

FIG. 21 is a flowchart illustrating an operation according to an embodiment of the present invention.

FIG. 22 is a flowchart illustrating an operation according to an embodiment of the present invention.

FIG. 23 is a flowchart illustrating an operation according to an embodiment of the present invention.

FIG. 24 is a flowchart illustrating an operation according to an embodiment of the present invention.

FIG. 25 is a flowchart illustrating an operation according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Control means 4 Abnormality detection means 9 Backlight 10 Operation command key 13 Liquid crystal display (LCD)

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI G06F 1/26 H04N 1/00 B G09G 3/18 G02F 1/133 535 H04N 1/00 G06F 1/00 332B // G02F 1 / 133 535 334G

Claims (13)

[Claims] 1. An operation of a backlight of a liquid crystal display device in a printing device, comprising a liquid crystal display device having a backlight, wherein the backlight is turned off or blinks during a plate making operation and / or a printing operation. Control method. 2. A liquid crystal display device having a backlight, and an operation command key for outputting an operation signal to a printing apparatus main body, wherein the backlight is turned off or blinks during a plate making operation and / or a printing operation, A backlight operation control method for a liquid crystal display device in a printing apparatus, wherein the backlight is turned on when the operation signal is output during a plate making operation and / or a printing operation. 3. A liquid crystal display device having a backlight, and an abnormality detecting means for detecting when an abnormality occurs during the operation of the printing apparatus main body and outputting an abnormality signal, and during a plate making operation and / or Alternatively, the backlight is turned off or blinks during a printing operation, and the backlight is turned on when the abnormal signal is output during a plate making operation and / or a printing operation. Backlight operation control method. 4. A liquid crystal display device having a backlight, and an abnormality detecting means for detecting an abnormality when the printing apparatus main body operates during operation and outputting an abnormality signal, and performing a prepress operation and / or Alternatively, the backlight is turned off or blinks at a first interval during a printing operation, and the backlight blinks at a second interval when the abnormal signal is output during the plate making operation and / or the printing operation. An operation control method for a backlight of a liquid crystal display device in a printing apparatus. 5. The backlight according to claim 1, wherein the backlight is turned on immediately before or immediately after the end of each operation.
A method for controlling the operation of a backlight of a liquid crystal display device in a printing apparatus according to claim 4. 6. The liquid crystal device according to claim 1, wherein the illuminance of the backlight can be controlled in accordance with a state of the printing apparatus main body. A backlight operation control method for a display device. 7. The liquid crystal display device according to claim 1, wherein the backlight is turned off after the main body of the printing apparatus is left for a predetermined time. Backlight operation control method. 8. The system according to claim 1, wherein the backlight is arbitrarily switched on and off in preference to changing an operation state of the backlight according to each operation of the printing apparatus main body. 8. A method for controlling the operation of a backlight of a liquid crystal display device in a printing apparatus according to claim 7. 9. The liquid crystal display device has a plurality of display areas, a plurality of backlights are provided corresponding to the plurality of display areas, and the operations of the plurality of backlights are individually controlled. The method of controlling the operation of a backlight of a liquid crystal display device in a printing apparatus according to any one of claims 1 to 8, wherein 10. The method according to claim 9, wherein the backlight is configured to be color-coded. 11. A liquid crystal display device having a backlight, wherein the backlight is turned off or blinks during a plate making operation and / or a printing operation, and the display of the liquid crystal display device is erased. Liquid crystal display device in printing device and operation control method of backlight thereof 12. A liquid crystal display device having a backlight, wherein the backlight is turned off or blinks during a plate making operation and / or a printing operation, and a display of the liquid crystal display device is changed from a display in a standby state. A liquid crystal display device in a printing device and an operation control method of a backlight thereof. 13. A liquid crystal display device having a backlight,
Various keys for outputting a signal to the printing apparatus main body, and abnormality detecting means for detecting when an abnormality occurs in the printing apparatus main body and outputting an abnormal signal, and after leaving the printing apparatus main body for a predetermined time, The backlight is turned off, and when the various keys are pressed and the signal is output when the light is turned off, or when the abnormality detection unit detects the abnormality and outputs the abnormality signal, the backlight is turned off. A method for controlling the operation of a backlight of a liquid crystal display device in a printing apparatus, which is turned on.