JPH06102845A - Picture display control device - Google Patents

Abstract

PURPOSE:To suppress irregularity of luminance of a display apparatus and to enable discriminating obviously whether a system is operating or not by repeating alternately normal display (non-inverse display) and inverse display and equalizing approximately total lightening time of each picture element in whole screen. CONSTITUTION:An operation processor 6 discriminates time T in which a command from an external device 2 and a touch switch 5 and display contents of a display apparatus 3 based on an operation result of the operation processor 6 are not entirely changed by starting and monitoring a timer 10, when this time interval T exceeds a prescribed set time T, alternate display control of an non-inverse picture and an inverse picture is performed. That is, when display contents of the display apparatus 3 is not changed for a prescribed time T1 (for example 5 minutes) or more, inverse display and normal display are made to perform alternately and repeatedly with time interval of a prescribed time (for example 10 seconds). This alternate display state is canceled at a point of time at which a command for changing display contents is inputted, and the screen is turned to a normal display state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a display such as a CRT, a plasma display, an EL element, etc., and displays graphics, graphs, characters, images, etc. on a display screen according to information input from the outside or internal processing information. The present invention relates to an image display control device capable of changing a part or all of a display image, and particularly relates to a measure for preventing uneven brightness (screen burning) that occurs when a situation in which there is no screen change for a long time continues for a long time.

[0002]

2. Description of the Related Art Recently, CRTs, plasma displays,
An intelligent operation panel having a display function using a display such as an EL display, a communication function with a host computer, and an input function such as a touch panel has been put into practical use, and has been widely used in various fields including an information terminal in a production site. Used in the field.

One of these intelligent type operation panels
As one of the features, there is a function that the whole or a part of the figure once drawn can be easily changed by the data input by the communication function or the operation of the touch panel by the operator, and the calculation by the CPU inside the apparatus ( For example, JP-A-61-148489).

By the way, in the above production sites,
Frequently, the same display screen is continuously displayed without performing any operation or external communication on the intelligent operation panel for a long time.

In such a situation, the above CR
When a display device such as a T, plasma display, or EL display device is used, in these display devices, the brightness of the pixels that are lit decreases earlier than the pixels that are not lit due to long-time lighting. As a result, uneven brightness occurs relatively early.

Therefore, conventionally, when there is no operation or communication for a certain period of time, the above-mentioned problem is dealt with by deleting the screen display.

Specific examples of the above-mentioned erasing process include: cutting off the power supply to the display unit; setting all display data to parenthesis "0" (pixels are off); clearing all data in display RAM There is.

[0008]

However, such a conventional technique has the following problems.

(1) Since the entire screen is erased, it is difficult to determine whether the operation panel or the system to which the operation panel is connected is operating or stopped. (2) When it is not desired to erase the display screen, a dummy operation must be performed at regular intervals to prevent the screen from being erased.Therefore, an operator can monitor the display screen of this display unit from a remote location. It is very inconvenient if you do. (3) When the operation is restarted from the screen erased state, since the current display content is unknown, the screen display must be restarted by a dummy operation, and then the operation must be restarted, which complicates the operation. (4) Even if an alarm display is sent to notify an abnormality of the system, if the display is not noticed within a certain period of time, the screen may be erased and the alarm may be missed.

The present invention has been made in view of the above circumstances, and reduces the uneven brightness of the display without performing a troublesome operation, and makes it easy to see whether the system is operating or not from a remote place. It is an object of the present invention to provide an image display control device capable of appropriately transmitting an emergency display item to an operator.

[0011]

According to the present invention, in an image display control device having a display for displaying a screen for displaying various states and for inputting signals, there is no change in the display image displayed on the display. When a timer for measuring a time interval and a time measured by the timer exceed a predetermined time set in advance,
Display control means for controlling so that the image data to be displayed on the display device is reversed in gradation and the non-reversed image data in which gradation is not reversed are alternately and repeatedly displayed until the display image changes. I have to.

[0012]

That is, according to the present invention, when the state in which the state of the display image does not change occurs for a certain time or more, the normal display (non-inverted display) and the inverted display are alternately repeated so that each pixel is The total lighting time is set to be substantially the same on the entire screen to suppress the uneven brightness of the display.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the embodiments shown in the accompanying drawings.

FIG. 2 shows an example of the configuration when the present invention is applied to an intelligent type operation panel. The intelligent operation panel 1 is connected to an external device 2 for controlling / monitoring a production line, controlling / monitoring a physical distribution, controlling / monitoring a disaster prevention / security system, monitoring a process of a plant, and displaying various statuses. It functions as an operation terminal for performing switch input.

The display 3 is a CRT, a liquid crystal display,
Plasma displays, EL displays, etc.,
A display screen is displayed on the display device 3 in which screen elements for various status displays and signal inputs are arbitrarily combined. The display screen is composed of various graphics such as characters, figures, numerical values, and graphs.

FIG. 3 shows an example of the display screen.
In this case, the display screen is a line graph display portion D1, an automatic driving operation switch portion D2, three analog display meters D3 to D5, a numeric keypad portion D6, a current average value display portion D.
7 and a set target value display portion D8.

The display memory 4 stores display data to be displayed on the display device 3 in a bit map format, and the storage content of the display memory 4 and the display content of the display device 4 are one-to-one.
Corresponding to.

A touch panel switch 5 is laminated on the display device 3. The touch panel switch 5 has a plurality of small film-shaped switches that respond to pressure arranged in a matrix on the effective surface of the switch, and inputs the input position information indicating which switch is designated by the operator to the arithmetic processing unit 6. Output to.

The interface 7 is RS232C, RS
It has a communication interface such as 422, RS485, Ethernet, GP-IB, parallel I / O, etc., and executes data transmission / reception with the external device 2.

The control memory 8 stores user screen data created by the user, an operation program for performing a required display operation, a set value of the timer 10, and the like.

The timer 10 is controlled and monitored by the arithmetic processing unit 6 and executes the following two timing operations.

(1) The time when there is no change in the state of the display screen of the display unit 3 is counted.

(2) The state change of the display screen is T1 for a certain period of time.
If not, the non-inverted image in which the current display image is displayed as it is (see FIG. 4A) and the inverted image in which each pixel of the current display image is inverted in black and white (see FIG. 4B) are alternated. The display is performed every predetermined time, and the time interval of the alternate display at this time is measured.

The arithmetic processing unit 6 receives an operation request from the external device 2 or a request from the operator via the touch switch 5 and refers to the data stored in the control memory 8 to execute the arithmetic processing corresponding to the request. Depending on the execution result, it issues a command to the graphic control unit 9 to control the display of the display device 3, or issues a command to the external device 2 via the interface 7.

At the same time, the arithmetic processing unit 6 sets the time interval T at which there is no change in the display content of the display 10 due to a command from the external device 2 or the touch switch 5 or the arithmetic result of the arithmetic processing unit 6. The determination is made by starting and monitoring the timer 10, and when this time interval T exceeds a predetermined set time T1, alternate display control of the non-inverted image and the inverted image shown in FIGS. To execute. That is, in the arithmetic processing unit 6, as shown in FIG. 5, when the display content of the display device 3 is not changed for a predetermined time T1 (for example, 5 minutes) or more, the reverse display and the normal display are performed at a predetermined time interval T2 ( For example, 10 seconds) are alternately repeated. This alternate display state is canceled when a command to change the display content is input, and the screen returns to the normal display state. Details of these controls will be described later.

The graphic control section 9 executes normal display control for the display 1 and alternate display control of the non-inverted / inverted image according to the operation command from the arithmetic processing section 6.

FIG. 1 is a flow chart showing the outline of the non-inverted / inverted image alternate display control operation. The operation will be described below with reference to this flow chart.

In the control memory 8, as shown in FIG.
Area (lowest bit of address A) for storing an alternate display control execution flag indicating whether or not to execute the alternate display control, the waiting time T1 (from when the display content is fixed until the alternate display control is performed. Area for storing wait time (A)
+1, A + 2), and areas (addresses A + 3, A + 4) for storing the non-inverted / inverted display cycle T2 are prepared, and these data are being operated by the data input from the external device 2 or the touch switch 5. The user can freely rewrite it before starting operation.

First, when the operation panel is powered on, the arithmetic processing unit 6 sets the default value preset for the alternate display control execution flag and the set times T1 and T2 in the control memory 8. Memory areas A to A + 4
Set the address (step 100).

Then, the arithmetic processing section 6 stores the storage area A + 1.
The waiting time value T1 stored in (1) is set in the timer 10 (step 110).

After that, the arithmetic processing unit 6 periodically confirms the presence or absence of a change in the state of the display device 3 by discriminating the command from the external device 2 and the touch switch 5 and the arithmetic result of the arithmetic processing unit 6. (Step 120) If there is no state change, it is confirmed whether the timer 10 has finished counting the set time T1 and the time is up (Step 13).
0) If the time is up, check the state of the alternate display control execution flag (step 140). If this flag is on (with alternate display control), the indicator 3 is displayed. The display data currently displayed is inverted black and white bit by bit, and this time the storage area A
The period T2 stored in +3 is set in the timer 10 (step 150).

After that, the arithmetic processing unit 6 receives commands from the external device 2 and the touch switch 5 and the arithmetic processing unit 6 as described above.
Whether or not the state of the display 3 has changed is periodically checked by discriminating the calculation result of (step 160). If there is no state change, the timer 10 finishes the time measurement of the set time T2 and the time is up. If the time is up, the display data reversely displayed on the display device 3 is inverted black and white bit by bit to display the display data in the normal direction. , The period T2 stored in the storage area A + 3 is set by the timer 10
(Step 180).

When the normal display time is made different from the reverse display time T2 to be T3, the timer value T3 is set in the timer 10 at this point.

After that, the arithmetic processing unit 6 periodically confirms the presence or absence of a state change of the display device 3 by discriminating the instruction from the external device 2 and the touch switch 5 and the arithmetic result of the arithmetic processing unit 6. If there is no state change (step 190), it is confirmed whether the timer 10 has finished counting the set time T2 or T3 and the time is up (step 200), and the time is up. In this case, the display data that is normally displayed on the display device 3 is displayed in black and white by inverting the display data bit by bit, and the period T2 stored in the storage area A + 3 is set in the timer 10. (Step 150).

Hereinafter, the alternate display control of the normal / reverse image is repeatedly executed until the display content of the display 3 is changed.

Next, details of the black and white reversal processing of the image will be described.

First, a first specific example of the black-and-white reversal process will be described with reference to FIG.

In the normal normal display state, the graphic control unit 9 reads the normal normal image data stored in the display memory 4 and adds a clock signal and a control signal to this to display an image. The normal image data is displayed on the display 3 by outputting it to the display 3 as a signal.

When displaying a reverse image, a command to that effect is input from the arithmetic processing unit 6 to the graphic control unit 9. When this command is input, the graphic control unit 9 reads out the normal image data stored in the display memory 4 by the linking process with the arithmetic processing unit 6 and applies the bit inversion process to the read image data. Meanwhile, it is stored again in the display memory 4. Then, the graphic control unit 9 reads the inverted image data re-stored in the display memory 4, adds a clock signal and a control signal to the image data to form an image display signal, and the formed image display signal is used to display the formed image display signal. The reverse image data is displayed on the display device 3 by outputting to the display device 3.

By alternately repeating the above process, the alternate switching control of the forward / reverse image is executed.

FIG. 7 shows a second specific example of the configuration relating to the image inversion processing. In this case, the graphic control section 9 is composed of a control section 11 and a signal inversion section 12. In the normal normal display state, the control unit 11 reads normal normal image data stored in the display memory 4, adds a clock signal and a control signal to the normal normal image data, and displays it as an image display signal. The normal image data is displayed on the display device 3 by outputting to the display device 3.

When displaying a reverse image, a command to that effect is input from the arithmetic processing unit 6 to the control unit 11. Control unit 1
In No. 1, the transmission of the image display signal including the normal image data to the display 3 is stopped, and the image display signal is output to the signal inverting unit 9. In the signal inverting unit 9, the clock signal and the control signal in the image display signal are left as they are,
Only the image data is subjected to bit inversion processing, a clock signal and a control signal are added to the image data subjected to the bit inversion processing to form an image display signal, and the formed image display signal is output to the display device 3 to display an inverted image. The data is displayed on the display 3.

By alternately repeating the above process, the alternate switching control of the forward / reverse image is executed.

FIG. 8 shows a third configuration of the image inversion processing.
In this case, the graphic controller 9 is composed of a controller 11 and a signal generator 13. The display memory has storage areas for two display screens, which are respectively stored in the first display memory area 4
a and the second display memory area 4b. Normal image data is stored in the first display memory area 4a, and reverse image data is stored in the second display memory area 4b.

In the normal normal display state, the signal generator 13 reads the normal normal image data stored in the first display memory 4a and adds a clock signal and a control signal to it. The normal image data is displayed on the display 3 by forming an image display signal and outputting the image display signal to the display 3.

When displaying a reverse image, a command to that effect is input from the arithmetic processing unit 6 to the control unit 11. Control unit 1
Reference numeral 1 denotes a normal processing image data stored in the first display memory area 4a by a cooperation processing with the arithmetic processing unit 6, and the read image data is copied to the second display memory 4b while performing bit inversion processing. To do. When the copying is completed, the arithmetic processing unit 6 gives a command to the signal generating unit 13 via the control unit 11 to display the data in the second display memory 4b. As a result, the signal generator 13 reads the inverted image data stored in the second display memory 4b, adds a clock signal and a control signal to this to form an image display signal, and displays the formed image display signal. The inverted image data is output to the display unit 3
Display on top.

By alternately repeating the above processing, the alternate switching control of the forward / reverse image is executed.

In FIG. 9, the state of the display screen changes for a certain time T
This shows another example of black-and-white inversion control of the display image when there is not more than one. In this case, one of the two screens has the normal image in the upper half of the screen and the reverse image in the lower half. The normal image is arranged in the lower half of the screen and the reverse image is arranged in the upper half of the other image (FIG. 9 (b)).

When the screen switching of FIG. 9 is performed according to the first concrete example described above with reference to FIG. 2, when a state in which the display screen does not change for a certain period of time T1 or more has elapsed, a command to that effect is issued. It is input from the arithmetic processing unit 6 to the graphic control unit 9. Then, in the graphic control unit 9, the bit inversion process is applied to the data corresponding to the lower half of the screen among the normal image data stored in the display memory 4 by the link process with the arithmetic processing unit 6, and The bit-inverted data of is re-stored in the original address of the display memory 4. Then, the graphic control unit 9 reads out all the image data stored in the display memory 4 and adds a clock signal and a control signal to this to form an image display signal, and the formed image display signal is used to display the image display signal. The image as shown in FIG. 9A is displayed on the display 3 by outputting the image to the display 3.

Then, if the display screen does not change even after the switching cycle period T2 has elapsed, the arithmetic processing section 6 outputs an image inversion command to the graphic control section 9. In response to this command, the graphic control unit 9 performs bit inversion processing on all the image data stored in the display memory 4, and causes the display memory 4 to store the bit-inverted data again. Then, the graphic control unit 9 reads out all the image data stored in the display memory 4 and adds a clock signal and a control signal to this to form an image display signal, and the formed image display signal is used to display the image display signal. By outputting to
An image as shown in (b) is displayed on the display device 3.

As long as there is no change in the display screen, the above processes are alternately repeated to alternately display images as shown in FIGS. 9 (a) and 9 (b).

When there is a change in the display screen in such an alternating display state, the entire screen is returned to the normal forward display screen. In this return control,
If the current inversion process is an even number, the bit inversion process is performed on the image data corresponding to the lower half of the screen of the display memory 4, and if the current inversion process is an odd number, the screen of the display memory 4 is displayed. By performing the bit inversion process on the image data corresponding to half, the next screen is restored to the normal normal display screen.

Next, the second part described above with reference to FIG.
The operation for switching the screen shown in FIG. 9 will be described with reference to the specific example of FIG.

That is, when the screen shown in FIG. 9A is displayed, the portion corresponding to the upper half of the screen of normal normal image data stored in the display memory 4 is read as it is, and this is displayed. Output to 3. With this,
The portion corresponding to the lower half of the screen of the normal non-rotated image data stored in the display memory 4 is input to the signal inversion unit 12 and the bit-inverted inverted image data is output to the display unit 3.

In the case of displaying the screen of FIG. 9B, the portion corresponding to the upper half of the screen of the normal non-rotated image data stored in the display memory 4 is the signal inverting section 1.
Inverted image data input to 2 and bit-inverted is output to the display device 3. At the same time, the portion corresponding to the lower half of the screen of the normal normal image data stored in the display memory 4 is read out as it is and output to the display unit 3.

As long as there is no change in the display screen, the above processes are alternately repeated to alternately display images as shown in FIGS. 9 (a) and 9 (b). Also in the case of the second specific example, the processing when there is a change in the display screen is almost the same as that of the first specific example.

Next, the third part described above with reference to FIG.
The operation for switching the screen shown in FIG. 9 will be described with reference to the specific example of FIG.

In this case, when the alternate switching control of the screen is started, the control unit 11 of the graphic control unit 9 cooperates with the arithmetic processing unit 6 so that the first display memory area 4a shown in FIG. The image data of a) is stored, and the image data of FIG. 9B is stored in the second display memory area 4b.

As long as there is no change in the display screen, these two image data are alternately displayed in the display unit 3 in correspondence with the cycle T2.
The images as shown in FIGS. 9A and 9B are alternately displayed by outputting the image.

In the third specific example, when there is a change in the display screen in the state of the alternate display, the control unit 11 of the graphic control unit 9 causes the arithmetic processing unit 6 to operate.
In cooperation with the above, the storage contents of the lower half of the second display memory 4a are transferred to the area where the lower half of the first display memory 4a is stored, and then stored from the storage data of the first display memory 4a. By forming an image display signal and sending it to the display device 3, the entire screen is restored to the normal normal display screen.

Although the screen is divided vertically in the embodiment of FIG. 9, it may be divided horizontally or diagonally. Furthermore, the number of divisions is not limited to two divisions, three,
4, ... may be subdivided.

That is, according to such display control, the display screen of the display is divided into a plurality of areas, the switching timing from the reverse image to the non-reverse image and the change timing from the non-reverse image to the reverse image in each of the divided areas. The timing is different for each.

FIG. 10 shows still another embodiment. This embodiment relates to a case where it is necessary to display an urgent display item during the alternate display of the inverted / non-inverted images.

That is, when displaying the emergency display item, the emergency display item is displayed in an overlapping manner on the display screen that is displaying the alternate display, and the emergency display item is not displayed alternately. To

In order to perform such control, it is necessary to distinguish in advance the image blocks for which the alternate inversion control is performed and the image blocks for which the alternate inversion control is not performed, and to give the image block an attribute for distinguishing them in advance. I have to.

Next, the third part described above with reference to FIG.
The operation for switching the screen shown in FIG. 10 will be described with reference to the specific example of FIG.

That is, when the alternate switching control of FIGS. 10 (a) and 10 (b) is started, the control unit 11 of the graphic control unit 9 cooperates with the arithmetic processing unit 6, and first, the first display memory area. The normal image data of FIG. 10A is stored in 4a. Further, in the second display memory area 4b, the image blocks to which the image inversion prohibition attribute has not been added are stored with data after performing the inversion process, and the image blocks to which the image inversion prohibition attribute has been added are subjected to the inversion process. Store data without executing.

Then, as long as there is no change in the display screen, the image data stored in these two memory areas 4a and 4b are alternately output to the display device 3 in correspondence with the cycle T2, as shown in FIG. ) Images are alternately displayed.

Further, when there is a change in the display screen in the alternate display state, the control unit 11 of the graphic control unit 9 cooperates with the arithmetic processing unit 6 to change the data stored in the first display memory 4a. By forming an image display signal and sending it to the display device 3, the entire screen is restored to the normal normal display screen.

Although the display screen has been described as a monochrome binary image in the above embodiment, the present invention may be applied to a multi-tone display screen or a color display screen.
In the case of a color display screen, the gradation may be reversed for each of the R, G and B planes.

Further, in the embodiment, the inverted image and the non-inverted image are alternately displayed. However, a display erasing period used in the prior art is provided between them and these three states are sequentially displayed. You may make it switch.

Further, although the present invention is applied to the intelligent type operation panel in the above embodiment, the present invention is applied to other equipment having a display for displaying various status displays and screens for signal input. You may make it apply.

[0073]

As described above, according to the present invention,
When the state in which the state of the display image does not change has passed for a certain period of time or more, the normal lighting display (non-reverse display) and the reverse display are alternately repeated, so that the total lighting time of each pixel becomes substantially equal in the entire screen. Since the brightness unevenness of the display device is suppressed in this way, the following effects are obtained.

(1) It is possible to determine at a glance whether or not the system is in operation.

(2) Since the screen is turned on, no dummy operation is required, so that operability is improved.

(3) The display screen can be monitored from a remote place.

(4) Since the emergency display item is displayed without being erased, the probability of overlooking the emergency item is reduced.

[Brief description of drawings]

FIG. 1 is a flowchart showing the operation of an embodiment of the present invention.

FIG. 2 is a block diagram showing the configuration of an embodiment of the present invention.

FIG. 3 is a diagram showing an example of a display screen of a graphic operation panel to which the invention is applied.

FIG. 4 is a diagram showing an example of alternate switching of inverted / normal images.

FIG. 5 is a time chart of alternate switching of inverted / normal images.

FIG. 6 is a conceptual diagram of a memory in which a waiting time until alternate switching control, an inversion non-inversion cycle, and the like are set.

FIG. 7 is a block diagram showing an example of a detailed circuit of the graphic control unit according to the embodiment of the present invention.

FIG. 8 is a block diagram showing another example of details of the graphic control unit and its peripheral circuit according to the embodiment of the present invention.

FIG. 9 is a diagram showing another example of alternate switching control.

FIG. 10 is a diagram showing a screen when an emergency display item is displayed.

[Explanation of symbols]

 1 ... Intelligent type graphic operation panel 2 ... External device 3 ... Display unit 4 ... Display memory 5 ... Touch switch 6 ... Arithmetic processing unit 7 ... Interface 8 ... Control memory 9 ... Graphic control unit 10 ... Timer

Continuation of front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location G09G 5/10 D 8121-5G

Claims (5)

[Claims] 1. An image display control device comprising a display for displaying a screen for displaying various states and for inputting signals, and a timer for measuring a time interval in which there is no change in the display image displayed on the display. When the time measured by the timer exceeds a predetermined time set in advance, the inverted image data in which the image data displayed on the display device is tone-inverted and the non-inverted image data in which the tone is not inverted are alternated until the display image changes. An image display control device comprising: a display control unit for controlling the repeated display on the screen. 2. The display control means divides a display screen of a display device into a plurality of areas, and a switching timing from a reversed image to a non-reversed image and a switching timing from a non-reversed image to a reversed image in each of the divided areas. The image display control device according to claim 1, wherein the image display control device is different from each other. 3. The display control means, if an urgent display item occurs during the alternate display of the reversed image data and the non-reversed image data, displays the urgent display item alternately. 2. The image display control apparatus according to claim 1, wherein the emergency display item is displayed in an overlapping manner on the display screen, and the alternate display is not performed for the emergency display item. 4. An image display control device comprising a display device for displaying a screen for displaying various states and for inputting signals, and a timer for measuring a time interval during which there is no change in the display image displayed on the display device, When the time measured by the timer exceeds a predetermined time set in advance, a period for displaying inverted image data in which the image data displayed on the display is tone-reversed, a period for displaying non-inverted image data without tone inversion, and a screen An image display control device comprising: a display control unit that controls to switch a screen erasing period in which the erasure is performed in a predetermined order. 5. A display device for displaying a screen for displaying various statuses and signal inputs, and an input for an operation switch for signal input in a display screen which is stacked on the display device and displayed on the display device. An image display control having a function of executing a required display operation according to a command of a connected external control device and transmitting information of the operation switch to the external control device. In the device, a timer that measures a time interval in which there is no change in the display image displayed on the display, and when the time measured by the timer exceeds a preset predetermined time, the image data displayed on the display is gray-scale inverted. Display control means for controlling to display alternately the inverted image data and the non-inverted image data which is not tone-inverted until the display image is changed. Image display control apparatus which so that.