JP2015207174A - Touch panel wrong operation preventing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a wrong operation by a touch in restoration from a power-saving mode to a normal mode with a reliable and simple configuration.SOLUTION: A display timing control part 61 displays a screen saver image on a liquid crystal display panel 7, simultaneously with the turn-off of a backlight 8 that is performed when a touch panel 10 is not operated within a predetermined time. A display stop timing control part 62 stops the display of the screen saver image on the liquid crystal display panel 7 when the backlight 8 is turned off in response to a touch on the touch panel 10.

Description

  The present invention relates to a touch panel erroneous operation preventing apparatus for preventing a touch on a touch panel performed when a backlight of a liquid crystal display device is turned off from being erroneously operated. In particular, the present invention relates to a touch panel erroneous operation prevention device suitable for a liquid crystal display device using an OS (Operating System) having a screen saver function.

  In this specification, the touch refers to a series of operations until generation of a touch-on signal and a touch-off signal, which will be described later. In addition, the normal screen saver image refers to a moving image that prevents screen burn-in, such as an animation, but in this specification includes a still image that is not an animation or the like.

  Generally, a computer equipped with a liquid crystal display device and a touch panel shifts to a power saving mode in which the backlight is turned off when there is no touch on the touch panel for a certain time in the normal mode in order to suppress power consumption by the backlight. . Then, when the touch panel is touched in the power saving mode, such a computer turns on the backlight and returns from the power saving mode to the normal mode.

  In the power saving mode, since the backlight is turned off, the display screen becomes dark and it is not possible to know what image is currently displayed. For this reason, when the touch panel is touched at an arbitrary position when returning from the power saving mode to the normal mode, an operation part of the displayed image may be unintentionally touched depending on the touch position.

  Conventionally, in order to prevent such an erroneous operation, a system as shown in FIG. 3 has been used. In the system shown in FIG. 3, in the liquid crystal display device 11, the backlight driving unit 14 turns on and off the backlight 15 of the liquid crystal display panel 13 by receiving a lighting signal and a light-off signal from a PC (personal computer) 17. Let In addition, driving of the touch panel 12 in the liquid crystal display device 11 is controlled by the touch panel controller 16 that operates based on a command from the PC 17.

  The touch panel controller 16 is a dedicated controller and monitors whether the backlight 15 is turned on or off while monitoring the backlight state (lighted or turned off) based on the lighted state signal and the lighted state signal from the backlight driving unit 14. I was in control. Specifically, when the touch panel 12 is touched while the backlight 15 is turned off in the power saving mode, the touch panel controller 16 detects the finger down operation (down event) as the finger up operation (up up). Event) and transmitted to the PC 17. In the power saving mode, the PC 17 turns on the backlight 15 in response to an up event. However, since the PC 17 has not received a down event that validates the touch, the touch becomes invalid as an input operation. In this way, the power saving mode is canceled by touching, but erroneous operation can be prevented by invalidating the input operation.

  However, since such a system requires a dedicated touch panel controller 16, there is an inconvenience that it is expensive, and it is difficult to apply it to a general-purpose computer. On the other hand, the above-described method for preventing an erroneous operation by software can be easily applied to a general-purpose computer.

  For example, as a countermeasure for preventing erroneous operation of the touch panel by software, Patent Document 1 discloses a touch on a display image covered by a touch invalidation window by a touch invalidation window displayed in the forefront among all application program images. It is described that it is invalidated. This touch invalidation window is displayed in the foreground among all the application program images when shifting to the power saving mode by executing the resident application program, and the touch in the power saving mode is invalid as an operation on the display image. However, it is effective as an operation for canceling the power saving mode.

JP 2008-107906 A (published May 8, 2008)

  However, in a state where a plurality of application programs are activated, the application program that displays the touch invalidation window shares the display of the image on the foreground with the other application programs. As a result, a window of another application program, for example, an application program having a high display priority such as an error message may be displayed in the foreground. In such a case, since the touch invalidation window is not displayed on the forefront, there arises a disadvantage that the touch cannot be invalidated.

  The present invention has been made to solve the above-described problems, and its purpose is to prevent erroneous operation due to a touch on the touch panel when returning from the power saving mode to the normal mode with a reliable and simple configuration. is there.

  In order to solve the above problems, a touch panel erroneous operation prevention device according to the present invention is a touch panel erroneous operation prevention used in a liquid crystal display panel having a backlight and a touch panel provided on the liquid crystal display panel. A screen saver image display means for displaying a screen saver image on the liquid crystal display panel when the backlight is turned off, and the touch panel when the backlight is turned off and the screen saver image is displayed. Backlight control means for recognizing that the touch is an instruction to turn on the backlight.

  In the above configuration, the screen saver image display means displays the screen saver when the backlight is turned off to shift from the normal mode to the power saving mode when the touch panel is not touched for a predetermined time. The A touch on the touch panel is recognized as a screen saver image. Therefore, unlike the configuration for displaying the touch invalidation window described in Patent Document 1, the touch panel erroneous operation preventing apparatus according to the present invention does not share the display of the image on the foreground between application programs. Therefore, it is possible to reliably avoid an erroneous operation of a touch in the power saving mode.

  In addition, when the touch panel is touched for returning from the power saving mode to the normal mode (lighting of the backlight), the backlight control unit recognizes that the touch is a backlight lighting command. Thereby, the backlight control means can light a backlight based on the recognized lighting command.

  Display of the screen saver image as described above and stop of the display can be performed by software. Therefore, in order to prevent erroneous operation of the touch panel, a dedicated touch panel controller is not required unlike the computer system shown in FIG.

  The touch panel erroneous operation prevention device stops the display of the screen saver image on the liquid crystal display panel when the touch on the touch panel, which is the lighting command, is released and the state where the touch is not performed again continues for a predetermined time. Preferably means are provided.

  In the above configuration, the screen saver image display stop means cancels the display of the screen saver image when the touch that is made for returning from the power saving mode to the normal mode is canceled and the state in which the touch is not performed again continues for a predetermined time. The As a result, when the chattering occurs such that the finger touches the touch panel several times in a short time instead of the normal touch, the screen saver image display is not canceled and an erroneous operation can be prevented. .

  In the touch panel erroneous operation preventing apparatus, the screen saver image is preferably black.

  When shifting from the normal mode to the power saving mode, the user recognizes that the backlight is turned off and the display screen of the liquid crystal display panel becomes dark, the display screen becomes bright after touching in the power saving mode, and the normal mode is restored. . Further, as described above, when an erroneous operation due to chattering is prevented, the display of the screen saver image is not canceled simultaneously with the touch in the power saving mode. For this reason, since the screen saver image is solid black, the display screen remains dark even when the display of the screen saver image is not canceled when returning to the normal mode. Looks like it continues. Therefore, the above operation can be performed without giving the user a feeling of strangeness.

  In the touch panel erroneous operation prevention device, the screen saver image display means displays a screen saver image on each liquid crystal display panel for a system having a plurality of liquid crystal display devices including the liquid crystal display panel, the backlight, and the touch panel, Preferably, the screen saver image display stop means stops the display of the screen saver image on each liquid crystal display panel with respect to the system.

  In the above configuration, even in a system having a plurality of liquid crystal display devices (multi-display system), screen saver images can be displayed on the front side in all liquid crystal display devices.

  By being configured as described above, the present invention has an effect that an erroneous operation due to a touch when returning from the power saving mode to the normal mode can be reliably and simply prevented.

It is a block diagram which shows the structure of the computer system which concerns on one Embodiment 1 of this invention. It is a flowchart which shows the operation | movement in the normal mode and power saving mode of the said computer system. It is a figure which shows the structure of the conventional computer system.

  An embodiment 1 of the present invention will be described below with reference to FIGS. 1 and 2.

  In the present embodiment, the touch on the touch panel 10 to be described later is described as being performed with a finger, but needless to say, it may be performed with an indicator (such as a pen) other than the finger.

  FIG. 1 is a block diagram showing a configuration of a computer system 101 according to an embodiment of the present invention.

  As shown in FIG. 1, a computer system 101 includes a PC (personal computer) 1, a liquid crystal display device 2 serving as a display device and an input device of the PC 1, and a touch panel controller 3 that controls a touch panel 10 of the liquid crystal display device 2. I have.

  The OS of the PC 1 has a screen saver function that displays a screen saver image in the forefront among all application program images.

  The computer system 101 of this embodiment operates in a normal mode and a power saving mode. The normal mode is an operation mode in which a later-described backlight 8 is turned on while an image display state of a later-described liquid crystal display panel 7 is maintained. On the other hand, the power saving mode is an operation mode in which the backlight 8 is turned off while the image display state of the liquid crystal display panel 7 is maintained.

  In addition, although the liquid crystal display device 2 and the touch panel controller 3 are comprised separately from PC1, it is not restricted to this, You may be comprised integrally with PC1.

  First, the liquid crystal display device 2 and the touch panel controller 3 will be described.

  The liquid crystal display device 2 includes a liquid crystal display panel 7, a backlight 8 that emits light from behind the liquid crystal display panel 7, and a backlight drive unit that drives the backlight 8 in order to display an image generated by the PC 1. 9. The liquid crystal display panel 7 incorporates a backlight 8 as a part thereof. The backlight 8 is constituted by a cold cathode tube or an LED, and is lit by a driving current supplied from the backlight driving unit 9. The backlight drive unit 9 supplies a drive current to the backlight 8 in response to a lighting instruction from the backlight control unit 5 to be described later, and the drive current to the backlight 8 in response to a turn-off instruction from the backlight control unit 5. Stop supplying. The backlight drive unit 9 variably controls the drive current supplied to the backlight 8 for brightness adjustment.

  The liquid crystal display device 2 has a touch panel 10 for performing operations and inputs by touching on the liquid crystal display panel 7. The touch panel 10 is provided so as to overlap the liquid crystal display panel 7, and is configured by various touch panels such as a capacitance method and a resistance film method.

  The touch panel controller 3 drives the touch panel 10 according to a command from the touch panel control unit 4 to be described later, and outputs a touch (such as touch position coordinates) detected by the touch panel 10 to the touch panel control unit 4 as detection data. The touch panel controller 3 is a general-purpose controller.

  The PC 1 is a general-purpose computer that includes a CPU, a memory, a storage device (such as an HDD or an SSD), a communication interface, and the like, and has an OS installed therein, and executes an application program. The PC 1 (touch panel erroneous operation prevention device) displays a screen saver image on the liquid crystal display device 2 and the touch panel control unit 4 that controls the driving of the touch panel 10, the backlight control unit 5 that controls the turning on and off of the backlight 8. And a screen saver display control unit 6 to be operated.

  The touch panel control unit 4 generates a touch-on signal and a touch-off signal based on detection data from the touch panel controller 3. The touch-on signal is a signal that is output when the touch starts, that is, when the finger touches the touch panel, and the touch-off signal is a signal that is output when the touch is released, that is, when the finger leaves the touch panel 10. . The touch-on signal and the touch-off signal are given to the backlight control unit 5, and the touch-off signal is given to the screen saver display control unit 6.

  The backlight control unit 5 (backlight control means) has a fixed time for a period of time after the touch on the touch panel 10 is released or a period of time for which no touch is made after the liquid crystal display device 2 is started up. When (fixed time: time set by the user) is reached, that is, when the touch on the touch panel is not performed for a fixed time and there is no operation / input to the PC 1, the backlight is driven to shift to the power saving mode. A turn-off instruction (light-off signal) for turning off the backlight 8 is given to the unit 9. Further, when receiving the touch-on signal in the power saving mode, the backlight control unit 5 gives a lighting instruction (lighting signal) for lighting the backlight to the backlight driving unit 9 in order to return to the normal mode. Further, the backlight control unit 5 gives a luminance control signal for luminance adjustment to the backlight driving unit 9 according to a user instruction or the like when the backlight 8 is lit in the normal mode. The backlight control unit 5 normally uses a function of the OS, but can be provided separately from the function of the OS.

  The screen saver display control unit 6 includes a display timing control unit 61 and a display stop timing control unit 62 in order to control display of a screen saver image.

  The display timing control unit 61 (screen saver image display means) controls the timing for displaying the screen saver image. Specifically, the display timing control unit 61 receives a turn-off signal from the backlight control unit 5 and displays a black-colored screen saver image on the liquid crystal display panel 7, that is, starts display.

  The display stop timing control unit 62 (screen saver image display stop means) controls the timing for stopping the display of the screen saver image. Specifically, the display stop timing control unit 62 receives a touch-off signal from the touch panel control unit 4 after the backlight 8 changes from a light-off state to a light-on state in the power saving mode by a touch-on signal. When the state where the finger is separated from the touch panel 10 (the state where the touch is not made again) continues for a predetermined time, that is, when the time from the touch-off signal to the next touch-on signal exceeds the predetermined time, a screen saver image is displayed on the liquid crystal display panel 7. Stop.

  The operation of shifting to the power saving mode and returning to the normal mode of the computer system 101 configured as described above will be described with reference to FIG.

  The following description is for an operation after at least one touch is made after the liquid crystal display device 2 is started up. That is, although not shown in the drawings until the first touch after the liquid crystal display device 2 is started up, a process for determining whether or not the time during which the liquid crystal display device 2 has been touched has not been touched has reached a certain time. Is done.

  First, in a state where the liquid crystal display device 2 is displaying in the normal mode, the touch panel control unit 4 determines whether or not there is a touch on the touch panel 10 (step S1). In step S <b> 1, when the touch panel control unit 4 determines that there is a touch, the backlight control unit 5 releases the touch based on the touch-off signal from the touch panel control unit 4, that is, the finger is touched from the touch panel 10. It is determined whether or not the time since the time of leaving has reached a certain time (step S2). At this time, the backlight control unit 5 starts timing when it receives the touch-off signal, and continues timing until the predetermined time is reached.

  In step S2, if the backlight control unit 5 determines that a certain time has elapsed since the touch release, the backlight 8 is turned off and a screen saver image is displayed on the liquid crystal display panel 7 (step S3). The backlight 8 is turned off as follows. The backlight control unit 5 outputs a turn-off signal, and the backlight drive unit 9 receives the turn-off signal and stops supplying the drive current to the backlight 8 as follows. Done in On the other hand, the display of the screen saver image is performed by the display timing control unit 61 outputting the screen saver image to the liquid crystal display panel 7 using a turn-off signal from the backlight control unit 5 as a trigger.

  Thereby, the transition from the normal mode to the power saving mode is completed. In the power saving mode, the backlight 8 is turned off, and the display screen of the liquid crystal display panel 7 appears black regardless of the color of the screen saver image.

  Next, in the power saving mode, the touch panel control unit 4 monitors the touch on the touch panel 10 and determines whether or not the touch is started (step S4). In step S4, when the touch panel control unit 4 generates a touch-on signal based on the detection data from the touch panel controller 3 and determines that the touch is started, the backlight 8 is turned on (step S5). As described below, the backlight control unit 5 outputs a lighting signal based on the touch-on signal, and the backlight driving unit 9 receives the lighting signal to drive current to the backlight 8 as follows. This is done by starting the supply. In this way, a touch on the touch panel 10 when the screen saver image is displayed is recognized as a command to turn on the backlight 8.

  In this state, the backlight 8 is lit, but since the black-colored screen saver image is displayed on the liquid crystal display panel 7, the display screen appears black to the user. Further, the touch in the power saving mode is performed on the screen saver image, but is recognized as the lighting instruction of the backlight 8 as described above. Therefore, the touch panel control unit 4 is not recognized as the touch performed on another image displayed after the screen saver image. That is, the liquid crystal display panel 7 behaves as if a screen saver image prevents a subsequent image from being touched.

  After the touch recognized by the touch panel control unit 4 in the determination in step S4 is released and a touch-off signal is generated by the touch panel control unit 4, a screen saver display is displayed to determine whether or not the finger has been separated from the touch panel 10 for a predetermined time. The control unit 6 continues to determine (step S6). That is, the display stop timing control unit 62 of the screen saver display control unit 6 starts measuring time using the touch-off signal as a trigger. Then, the output of the touch-on / touch-off signal from the touch panel control unit 4 is monitored. The display stop timing control unit 62 ends timing when a touch is made again until the predetermined time is reached, that is, when a touch-on signal is output. In this case, as a matter of course, the measured time does not reach the predetermined time. Next, when the finger leaves the touch panel 10 and receives a touch-off signal from the touch panel control unit 4, the display stop timing control unit 62 starts timing again using the touch-off signal as a trigger.

  The predetermined time is set to 500 msec on the assumption that the user unintentionally touches the touch panel 10 after releasing the finger from the touch panel 10. However, the predetermined time is not limited to 500 msec, and may be set to another value.

  In step S6, when the display stop timing control unit 62 of the screen saver display control unit 6 determines that the state where the finger has been removed has continued for a predetermined time, the display of the screen saver image to the liquid crystal display panel 7 is stopped to thereby display the liquid crystal display. The panel 7 stops displaying the screen saver image (step S7).

  Thus, since the liquid crystal display panel 7 stops displaying the screen saver image, the image displayed immediately after the screen saver image is displayed in the foreground, and the subsequent touch is performed as an operation / input to the displayed image. Be recognized. In this way, the transition from the power saving mode to the normal mode is completed.

  On the other hand, the screen saver display control unit 6 causes the display timing control unit 61 to display a screen saver image on the liquid crystal display panel 7 when the backlight 8 is turned off (step S3). Further, the screen saver display control unit 6 causes the display stop timing control unit 62 to stop the display of the screen saver image on the liquid crystal display panel 7 when the finger is released for a predetermined time after the touch is released (step S <b> 6). S7).

  On the other hand, the process of step S1 is not performed until the first touch is made after the liquid crystal display device 2 is started up. Then, in place of the process of step S2, a process of determining whether or not a time during which the liquid crystal display device 2 is not touched has reached a certain time is performed.

  By providing the display timing control unit 61, when the touch panel 10 is touched when the screen saver image is displayed, the touch is recognized by the backlight control unit 5 as a lighting command for the backlight 8. On the other hand, the touch panel control unit 4 does not recognize a touch when the screen saver image is displayed as an operation for another image displayed after the screen saver image. In the OS of the present embodiment, a screen saver image is displayed in front of an image of an application program other than the screen saver, that is, the screen saver image is displayed in the foreground, and the screen saver image blocks the touch to the application program. The behavior is as described above. However, actually, the touch panel control unit 4 determines whether or not the touch is recognized as an operation depending on whether or not the screen saver image is displayed. Therefore, in the computer system 101, unlike the configuration in which the touch invalidation window described in Patent Document 1 is displayed, the display of images on the foreground is not performed between application programs. Therefore, it is possible to reliably avoid an erroneous operation of a touch in the power saving mode.

  Of course, in performing the process of not recognizing the touch as an operation, any process of recognizing the touch itself or recognizing the touch but not recognizing the touch may be performed.

  By the way, there are various types of OSs that display screensaver images in the foreground. However, in many OSs, the display of general screensaver images and the power saving mode cannot be executed at the same time. When shifting to the power saving mode, the display of the screen saver image is canceled. Therefore, as described above, a general screen saver image cannot be displayed in the power saving mode. Therefore, in the present invention, a screen saver image that can be displayed as a screen saver image in the power saving mode is separately provided as described above.

  In addition, by providing the display stop timing control unit 62, in order to return from the power saving mode to the normal mode, after the user touches the touch panel 10 and releases the finger from the touch panel 10, there is a state where the finger is released. If it lasts for a predetermined time, the display of the screen saver image can be canceled. Accordingly, when chattering occurs such that a finger touches the touch panel 10 multiple times in a short time instead of a normal touch, the display of the screen saver image is not canceled and erroneous operation can be prevented. it can.

  The separately provided screen saver image is a black color image. When the user shifts from the normal mode to the power saving mode, the backlight 8 is turned off and the display screen of the liquid crystal display panel 7 becomes dark. After the touch in the power saving mode, the display screen becomes bright and returns to the normal mode. recognize. As described above, in the present invention, the display of the screen saver image is not canceled simultaneously with the touch in the power saving mode. For this reason, since the screen saver image is solid black, the display screen remains dark even when the display of the screen saver image is not canceled when returning to the normal mode in which the backlight 8 is lit. Apparently, the power saving mode seems to continue. Therefore, it is preferable that the screen saver image is black so that the above-described operation is performed without a sense of incongruity to the user when returning to the normal mode.

  Furthermore, in the present invention, the setting of the power saving mode is the same as that of the conventional computer system, and no special setting is required. For example, when using a Windows (registered trademark) OS, only the power saving setting in the control panel needs to be performed. Moreover, the computer system 101 can use a general-purpose touch panel controller 3 instead of the dedicated touch panel controller 16 as in the conventional computer system shown in FIG. Therefore, erroneous operation of the touch panel 10 can be prevented only by providing the screen saver display control unit 6 and the touch panel control unit 4 realized as software without using a special tool.

  The PC 1 also accepts operations from other input devices such as a keyboard and a mouse, and the operation of these input devices can cancel the display of the screen saver image displayed in the power saving mode. Is the same.

  In the present embodiment, the screen saver image is displayed when the finger is released from the touch panel 10 for a predetermined time after the touch is released in the power saving mode, that is, when the touch is not performed again for a predetermined time. Although the display is stopped, it is not limited to this operation. If the prevention of chattering is not considered, the screen saver display control unit 6 stops when the touch starts in the power saving mode (when the finger touches the touch panel 10), thereby stopping the display of the screen saver image. Also good. In this case, the display stop timing control unit 62 does not count the time as described above (without the determination in step S6), and at the same time as the backlight 8 is turned on in the above-described step S5, Stop displaying the screen saver image.

  Further, in the present embodiment, the configuration in which the single liquid crystal display device 2 is used to shift between the normal mode and the power saving mode has been described. In addition, the present invention can be applied to a configuration that shifts between the normal mode and the power saving mode.

  For example, the present embodiment can be applied to a multi-display system having a plurality of liquid crystal display devices. In such a system, there is a configuration in which a DVI monitor is connected to the main liquid crystal display device 2 and another liquid crystal display device is used as an extended monitor of DVI. In the above multi-display system, a screen saver image can be displayed on the front side in all liquid crystal display devices. This is because, as described above, in the OS of the present embodiment, the screen saver image is displayed before the images of all other application programs.

  For example, when the configuration for displaying the touch invalidation window described in Patent Document 1 is applied to a multi-display system, the processing of the application program becomes complicated. Specifically, if the same processing as that for the main liquid crystal display device is to be performed for other liquid crystal display devices, while viewing the image displayed on the other liquid crystal display device, It is necessary to monitor all events such as whether only images are displayed and which image is touched. Further, in the processing of the application program, as described above, the foreground display conflict occurs with other application programs. On the other hand, in the present invention, by using the screen saver function, it is possible to display an image that can invalidate the touch of the image of the application program.

  Incidentally, the control blocks of the PC 1 (particularly the touch panel control unit 4, the backlight control unit 5, and the screen saver display control unit 6) may be realized by a logic circuit (hardware) formed in an integrated circuit (IC chip) or the like. However, it may be realized by software using a CPU (Central Processing Unit). However, the control block of the PC 1 is preferably realized by software instead of dedicated hardware. In the above-described embodiment, the control block is realized by software.

  In the latter case, the PC 1 is a CPU that executes instructions of a program that is software that realizes each function, a ROM (Read Only Memory) or a storage device in which the program and various data are recorded so as to be readable by a computer (or CPU). (These are referred to as “recording media”), and a RAM (Random Access Memory) for expanding the program. And the objective of this invention is achieved when a computer (or CPU) reads the said program from the said recording medium and runs it. As the recording medium, a “non-temporary tangible medium” such as a tape, a disk, a card, a semiconductor memory, a programmable logic circuit, or the like can be used. The program may be supplied to the computer via an arbitrary transmission medium (such as a communication network or a broadcast wave) that can transmit the program. The present invention can also be realized in the form of a data signal embedded in a carrier wave in which the program is embodied by electronic transmission.

  In the present embodiment, the example in which the present invention is applied to the PC 1 has been described. However, the present invention is not limited thereto, and the present invention can also be applied to a dedicated machine having a touch panel such as a programmable display.

  The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention.

  In the present embodiment, the OS that mainly displays the screen saver image before the image of another application program has been described as an example, but it has also been described that the screen saver image does not necessarily have to be displayed in the foreground. That is, an embodiment in which a touch when a screen saver image is displayed is recognized as a trigger for turning on the backlight 8 and stopping the display of the screen saver image, and does not affect other application programs. Included in the technical scope.

  INDUSTRIAL APPLICABILITY The present invention can be suitably used for preventing erroneous operation of the touch panel for canceling the power saving mode in a liquid crystal display device that operates by switching between the power saving mode in which the backlight is turned off and the normal mode.

1 PC (Touch Panel Incorrect Operation Prevention Device)
2 Liquid crystal display device 5 Backlight control unit (backlight control means)
7 Liquid crystal display panel 8 Backlight 6 Screen saver display control unit 61 Display timing control unit (screen saver image display means)
62 Display stop timing control unit (screen saver image display stop means)

Claims (3)

A touch panel erroneous operation preventing device used in a liquid crystal display panel having a liquid crystal display panel having a backlight and a touch panel provided on the liquid crystal display panel,
Screen saver image display means for displaying a screen saver image on the liquid crystal display panel when the backlight is turned off;
And a backlight control means for recognizing that the touch on the touch panel is an instruction to turn on the backlight when the backlight is turned off and the screen saver image is displayed. Misoperation prevention device.   A screen saver image display stop means for stopping the display of the screen saver image on the liquid crystal display panel when a state in which the touch on the touch panel, which is the lighting command is released, is not touched again continues for a predetermined time; The touch panel erroneous operation preventing device according to claim 1, wherein the touch panel erroneous operation preventing device is provided. The screen saver image display means displays a screen saver image on each liquid crystal display panel for a system having a plurality of liquid crystal display devices including the liquid crystal display panel, the backlight, and the touch panel,
3. The touch panel erroneous operation preventing apparatus according to claim 2, wherein the screen saver image display stopping unit stops the display of the screen saver image on each liquid crystal display panel with respect to the system.

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