JPH03228018A - Automatic turning on/off device for back light - Google Patents

Abstract

PURPOSE:To prevent power consumption caused by turning a back light on from being increased in such a software that has the need of using an external input device by performing the control of automatically turning the back light on/off even in the case of using the external input device other than a key board. CONSTITUTION:While the external input device 4 is in use, a time till the light is automatically turned off is reset at a specified address in a RAM every time when the external input device is used. Turning the back light on/off in a liquid crystal display device 1 is performed by setting an internal register. That means, as to the processing by interrupting to a CPU at fixed time intervals, whether the back light is already turned off or not is checked, and in the case that the back light is not turned off, the time after the external input device is not used is monitored, and in the case that the time becomes equal to the set time by an user, the back light is turned off by setting the Bit of the internal register '0'.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention is applicable to an information processing device to which an external input device such as a mouse can be connected and which uses a backlit liquid crystal display device.

[Prior Art] In information processing devices that use conventional backlit liquid crystal display devices, the backlight does not turn on and off automatically, or even if it does, it is only controlled automatically by keyboard input. was being carried out.

[Problem to be solved by the invention] However, even when using an external input device other than a keyboard, the backlight automatically turns off unconditionally when the time requested by the user has elapsed. The backlight had to be automatically turned on again each time using a keyboard input.

In recent years, with the increase in software that supports external input devices other than keyboards such as mice, the need to solve the above-mentioned problems has become more and more important.

It is an object of the present invention to solve these problems and provide a device that is easier to use.

[Means for Solving the Problems] In order to solve the above problems, the automatic lighting/extinguishing device for 8-9 lights of the present invention is a keyboard!・Even when using other 9-part input devices, it is necessary for the user to turn off the light or extinguish the light automatically when the specified time has elapsed, and if the backlight has already been turned off, use an external input device. In addition, the time it takes for the backlight to automatically turn off is determined by the amount of time that has passed since the input device was no longer used.
While the external input device is in use, the lamp remains on until it automatically turns off (the time is reset).

[Function] By controlling the automatic turning on and off of the backlight when using an external input device other than the keyboard, the backlight remains on while the external input device is in use, and when requested by the user. When the specified time has elapsed, the backlight will automatically turn off. the result,
The backlight operates normally even when using an external input device.

[Example] FIG. 1 is a diagram showing the configuration of a backlight automatic turning on/off device of the present invention. 1 is a liquid crystal display device, 2 is a main body of the information processing device, 3 is a keyboard, 4 is an external input device,
The external input device No. 4 is removable.

Next, the backlight automatic lighting/extinguishing device of the present invention will be explained.

The backlight is turned on and off by setting internal registers. FIG. 2 shows the relationship between bit definitions in the internal registers and their setting contents. That is, Bjt7-5. Areas 3 to 0 on B1 are reserved areas, and when Bit (4) is O, the backlight is off, and when Bit (4) is "1", the backlight is on.

Here, the control of turning on and off the backlight based on the program written in the internal ROrVI-B[)S will be explained with reference to the flowchart shown in FIG.

Note that the time from when the backlight turns on until it turns off next time is set in advance by the user in the RA bi with backup.

First, when starting up the system, the RAM inside the information processing device
After saving the time set by the user from when the backlight turns on until it turns off next time to the specific address of (Step 11), the backlight is turned on unconditionally (Step 12). Backlight The lighting is performed by setting Bit (4) of the internal register to "1".The setting method for the internal register conforms to the specifications of the controller.

The process executed by interrupting the CPU at regular time intervals checks whether the backlight has already been turned off (step 13), and if the backlight has not been turned off, waits until the user turns on the backlight. If the time is infinite, backlight control is unconditionally skipped (step 14). If it is not infinite, monitor the time after which the external input device is no longer used (Step 15), and when the time reaches the time set by the user, the backlight will turn off at the internal register B.
This is done by setting it(4) to 0 (
Step 16). If the backlight has already been turned off, the next process is executed without monitoring the time since external input B was no longer used. (Step 16) On the other hand, in FIG. 3(B), while the external input device is being used by the user, the time until the light turns off automatically is reset to the specific address in the RAM each time the external input device is used. (step 17), and only if the backlight is already off at that time (step 18), the backlight is turned on (step 19).

[Effects of the invention] As explained above, the automatic backlight lighting and
According to the light-off device, the hack light can be automatically turned on and off even when an external input device other than a keyboard is used, so in software that mainly uses an external input device, the power consumption of the backlight is reduced. Be able to prevent an increase in consumption.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of a backlight automatic lighting/extinguishing device. Figure 2 is a diagram showing the relationship between bit definitions and their settings in the internal register that controls the backlight, and Figures 3 (A) and 3 (B) are flowcharts showing the procedure for turning on and off the backlight. be. 1...Liquid crystal display device, 2...Main body of information processing device,...Keyboard, 4...External input device. that's all

Claims (1)

[Scope of Claims] 1) In an information processing device to which an external input device such as a mouse can be connected and in which a backlit liquid crystal display device is used, when a time requested by a user has elapsed, the liquid crystal display device is activated. A backlight comprising means for automatically turning off a backlight, and means for automatically turning on the backlight when the external input device is used next time if the backlight of the liquid crystal display device has already been turned off. Automatic light on/off device. 2) The time until the backlight automatically turns off is the elapsed time from when the external input device is no longer used, and the backlight remains lit while the external input device is used. 2. The device for automatically turning on and turning off a backlight according to claim 1, further comprising means for resetting a time period until the backlight is automatically turned off.