JP2007164080A - Electronic device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To allow backlight luminance to be controlled during operations not hindering a user in a start state, a standby state, a pause state, and a data transfer state of a display device provided with a backlight, in consideration that power is wasted because a display picture is always fixed even during operations not hindering the user in the start state, the standby state, the pause state, and the data transfer state, etc. and that problems of a usage time etc. occur on the user when using a battery or the like. <P>SOLUTION: An electronic device having the display device provided with the backlight includes a means for detecting an operation condition during a start operation in a start picture during the start operation and a means for controlling luminance of the backlight on the basis of the detection means. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electronic apparatus having a display device provided with a backlight and a backlight control method.

  Conventionally, in an information terminal or the like having a liquid crystal display (LCD) with a backlight, from the viewpoint of power saving, the brightness of the backlight is lowered after a certain time has elapsed since the last operation by the user. . This defines the monitoring time for monitoring the state where the input operation is interrupted for each application program or its operation status, measures the time when the input operation is interrupted based on the specified contents, and A technique is disclosed in which when the time reaches the monitoring time, the value of the current supplied to the backlight is lowered to make the backlight have a low luminance.

(For example, refer to Patent Document 1.)
A conventional flowchart will be described below with reference to FIG.

  In the periodic monitoring routine as shown in FIG. 5, the counting is started from the time when the input operation by the user is interrupted (step B1), and it is determined whether or not there is a new input operation by the user thereafter (step B2). .

  If there is no new input operation by the user, the running application program / operation state is obtained (step B3), the elapsed time (count value) is obtained (step B4), and the corresponding monitoring time is obtained (step B3). Step B5).

  Then, it is determined whether or not the elapsed time (count value) exceeds the monitoring time (whether or not the monitoring time has been reached) (step B6). If not, the process returns to step B2, and if it exceeds, the backlight is returned. An instruction is sent to decrease the brightness of the (step B7), and the process returns to step B1.

  On the other hand, when there is an input operation in step B2, the count value is reset (step B8), and when the luminance of the backlight is lowered, the luminance is restored to the normal state (step B9). ), And returns to Step B1.

In the above processing routine, when an error occurs in the operating application program and a recovery process is required by the user, the time until the backlight brightness decreases by increasing the monitoring time in the application program information. You may control to extend.
JP 2002-99248 A (7th page, FIG. 7)

  The present invention is useless as power saving because the display screen is always constant even in an operating state that does not hinder the user in the activated state, standby state, pause state, and data transfer state. In addition, when a battery or the like is used, problems such as usage time occur for the user.

  In order to solve the above problems, a configuration is provided that includes means for controlling backlight luminance during operation that does not hinder the user in the startup state, standby state, pause state, and data transfer state of a display device including a backlight.

  The present invention includes a backlight, has a startup state, a standby state, a pause state, and a data transfer state, and can control the appropriate backlight brightness according to the operation state, thus enabling power saving. This makes it possible to improve the usage time when using a power source such as a battery.

  Next, details of the present invention will be described in accordance with the description of the embodiments.

  Hereinafter, the present invention will be specifically described with reference to the drawings. FIG. 1 is a block diagram illustrating a configuration of a video camera including a display device according to an embodiment of the present invention. In FIG. 1, a lens unit 101 is for entering a subject image, and an image sensor 102 photoelectrically converts the subject image received from the lens 101. The camera signal processing unit 103 generates a luminance signal and a color difference signal by performing matrix processing on the output signal from the image sensor 102, and performs processing such as gamma processing and A / D conversion.

  The display signal generation unit 104 converts the signal from the camera signal processing unit 103 into a predetermined format and generates a signal for displaying an image.

  The liquid crystal display unit 106 includes a display driving unit 106a, a liquid crystal 106b, and an illumination light source 106c for irradiating light from the back surface of the liquid crystal 106a. The display driving unit 106a is configured to display an image based on a signal generated by the display signal generating unit 104. Is displayed. Further, a small liquid crystal display unit (not shown) of a type in which the display device is separately viewed may be configured. The large liquid crystal 106b and the small liquid crystal (not shown) 106a for driving the display may be driven separately, or both the liquid crystals may be driven simultaneously.

  The control unit 107 controls the system such as the camera signal processing unit 103, the display signal generation unit 104, the liquid crystal driving circuit 106a, the backlight 106c, the mode switching selection, and the operation unit 109. These processes are performed by the camera signal processing unit 103 supplying data, and the main CPU performs arithmetic processing, and performs aperture driving circuit, lens driving circuit, CCD driving circuit, camera signal color processing circuit, and recording / playback processing by media. Further, lighting of the display driving unit 106a and the backlight 106c is controlled. Necessary information is also displayed on the liquid crystal unit. Here, the case where the control unit controls the whole is illustrated, but a configuration in which the sub CPU and the main CPU share the configuration may be employed.

  A mode switch 108 switches between a camera image (camera recording) mode, a card image (still image recording), a reproduction mode, and a card reproduction mode.

  The operation unit 109 controls each unit according to the operation state of the power switch ON / OFF. Each circuit is controlled based on a switch operation, and also controls the drive of the image sensor 102 and the exposure value, focus, white balance, and the like.

  FIG. 2 is a flowchart showing microcomputer processing for performing backlight control. When the start is started (step S21), the start screen (step S22) is entered. The display screen in this case is usually a black screen or a logo display, and the brightness related to the image quality is not required. Therefore, the operation detection (step S23) means recognizes the state of the startup screen (step S22), performs backlight control (step S24), and reduces the luminance of the backlight. When the start of image output (step S25) starts, the process proceeds to the backlight control cancellation (step S26), and the backlight brightness is increased and the process ends. If the start of image output (step S25) is not reached, the screen returns to the startup screen (step S22). In this flowchart, the description is in the activated state, but the same applies to any of the standby state, pause state, and data transfer state.

  FIG. 3 is a different flowchart showing microcomputer processing for performing backlight control. The standby screen (step S32) state is entered by starting the media reading (step S31). In this case, the display screen normally displays information such as “loading” on the screen, and the back screen is a black screen. Therefore, brightness related to image quality is not required. Therefore, the operation detection (step S23) means recognizes the standby screen (step S32) state, detects the reading state (step S33), and recognizes the reading state. In accordance with the result of the reading status detection (step S33), backlight control (step S24) is performed in stages so that the progress status can be grasped, and the luminance of the backlight is changed. Simultaneously with the start of image output (step S25), the control proceeds to the backlight control cancellation (step S26), and ends with normal backlight brightness. If the start of image output (step S25) is not reached, the screen returns to the standby screen (step S32). In this flowchart, the description is in the standby state, but the same applies to any of the start state, pause state, and data transfer state.

  FIG. 4 is a different flowchart showing microcomputer processing for performing backlight control. By the start of data transfer (step S41), the state becomes the N times speed writing (step S42). In this case, the display screen normally displays information such as “Writing” on the screen, and the back screen is a black screen. Therefore, brightness related to image quality is not required. Therefore, the state of the writing screen (step S42) is recognized by the operation detection (step S23) means. Based on the result of the operation detection (step S23), backlight control (step S24) is performed, and the luminance of the backlight is reduced. When the backlight control (step S24) is performed, the signal level control (step S43) corrects the brightness of the liquid crystal to reduce the backlight brightness, and the contrast adjustment value is corrected to maintain the brightness on the screen. Similarly, even if the input signal of the liquid crystal driving circuit is corrected or the luminance level of the display character is corrected, the same effect is obtained. At the same time as the end of writing (step S44), the backlight control is canceled (step S26), and the process proceeds to the signal level control cancellation (step S45) to end. If the start of image output (step S25) is not reached, the screen returns to the standby screen (step S32). If writing is not completed (step S44), the process returns to N-times speed writing (step S42). Although this flowchart describes the data transfer state, the same applies to any of the start state, the standby state, and the pause state.

It is a block diagram which shows embodiment of this invention. 2 shows a flowchart of the present invention. 2 shows a different flowchart of the present invention. 2 shows a different flowchart of the present invention. It is a conventional flowchart.

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Lens 102 Image pick-up element 103 Camera signal processing 104 Display signal reproduction | regeneration part 105 Recording and reproduction | regeneration part 106 Liquid crystal part 106a Liquid crystal drive circuit 106b Liquid crystal panel 106c Illumination light source 107 Control part 108 Mode changeover switch 109 Operation part

Claims (12)

In an electronic device having a display device with a backlight,
An electronic apparatus comprising: means for detecting an operating state during a start-up operation on a start-up screen during start-up operation; and means for controlling the luminance of the backlight based on the detection means. In an electronic device having a display device with a backlight,
Means for detecting the operating status during the startup operation on the startup screen during the startup operation, means for controlling the luminance of the backlight stepwise based on the detection means, and a grasping means for grasping the progress status An electronic device comprising the electronic device. In an electronic device having a display device with a backlight,
A means for detecting an operating state during the start-up operation on the start-up screen during the start-up operation, a means for controlling the luminance of the backlight based on the detection means, and a video signal controlled according to the control of the backlight And an electronic device. In an electronic device having a display device with a backlight,
An electronic apparatus comprising: means for detecting an operating state during a standby operation on a standby screen during standby for reading into a medium; and means for controlling the luminance of the backlight based on the detection means. In an electronic device having a display device with a backlight,
Means for detecting the operation status during the standby operation on the standby screen waiting for reading into the media, means for controlling the backlight brightness step by step based on the detection means, and grasping the progress status And an electronic device. In an electronic device having a display device with a backlight,
A means for detecting an operating state during a standby operation on a standby screen waiting for reading into a medium, a means for controlling the luminance of the backlight based on the detection means, and a video according to the control of the backlight An electronic apparatus comprising: means for controlling at least a signal. In an electronic device having a display device with a backlight,
An electronic apparatus apparatus comprising: means for detecting at least a pause state and an operation state of a writing operation on a medium; and means for controlling the luminance of the backlight based on the detection means. In an electronic device having a display device with a backlight,
It comprises means for detecting a pause state and a writing operation to a medium, means for controlling the luminance of the backlight stepwise based on the detection means, and grasping means for grasping the progress status. Electronic equipment. In an electronic device having a display device with a backlight,
A unit for detecting a pause state and a writing operation to a medium; a unit for controlling the luminance of the backlight based on the detection unit; and a unit for controlling a video signal in accordance with the control of the backlight. Electronic equipment characterized by that. In an electronic device having a display device with a backlight,
An electronic apparatus comprising: means for detecting an operating state during N-times speed operation in a data transfer state; and means for controlling the luminance of the backlight based on the detecting means. In an electronic device having a display device with a backlight,
Means for detecting an operation state during N-times speed operation in a data transfer state, means for controlling the luminance of the backlight stepwise based on the detection means, and means for grasping the progress state; Features electronic equipment. In an electronic device having a display device with a backlight,
Means for detecting an operating state during N-times speed operation in a data transfer state, means for controlling the luminance of the backlight stepwise based on the detection means, and a video signal in accordance with the control of the backlight And an electronic device.

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