JPS61215588A - Liquid crystal display unit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to, for example, an electronic desktop calculator (hereinafter referred to as a calculator).
The present invention relates to a liquid crystal display device having a backlight such as the above, and particularly relates to a liquid crystal display device that can set the backlight lighting time after an operation is completed and can save battery power consumption.

In recent years, liquid crystal displays have been widely adopted as displays for calculators, portable terminal devices, and the like. These devices are equipped with a backlight on the liquid crystal display, which is turned on in dark places, but since they are usually powered by batteries, it is desirable to find a way to save power consumption while adapting them to business operations. ing.

[Conventional technology]

The LCD display can be read in bright places, but
Dark places 1 For example, in warehouses, the display may become unclear, so
The backlight allows light to pass through the back of the LCD to read the display. The power source used for the backlight is commonly a battery used for data processing, etc.

The following various methods are used to use this backlight.

■The bank light lights up only while the key is pressed.

■Press the backlight ON key once to turn on the backlight, and then press the OFF key to turn off the light. That is, it blinks by switching the switch 5.

■Lighting the backlight Press the key once to turn on the backlight, and it will automatically turn off after a certain amount of time has passed after the operation is completed. That is, as soon as a key is pressed, a time count is started, and when the next key is pressed within a predetermined time, the count is cleared, and counting is started again and the light is turned off after, for example, 30 seconds have elapsed.

In this way, power consumption is saved.

■Or has the functions of both ■ and ■.

[Problem that the invention seeks to solve]

According to the conventional method described above, method (3) requires pressing the button with one hand, which results in poor operability. In method (2), if the off button is not pressed even after the operation is completed, the backlight will often remain on forever, wasting power consumption. In method (2), the backlight turns off after a certain period of time, so there are various problems such as the backlight turning off at an unexpected time and making it troublesome to turn it on again.

Furthermore, in calculators and portable terminal devices, the proportion of power consumed by the backlight is greater than that consumed by data processing, so there is a problem in that it is necessary to save power.

[Means for solving problems]

The present invention includes a designated input means for inputting a specified backlight lighting time value after the operation of the operation unit is completed, and a time value input by the designated input means is set, and a predetermined initial state is set every time an operation is performed. A liquid crystal display device is provided with a time counting means for counting time, and turns off a bank light when the time counted by the time counting means reaches a set time value, thereby solving the above problem. It can be solved.

[Effect]

According to the present invention, the backlight lighting time value after the end of the operation is inputted by the specified input means, the time value is set in the time counting means, and the count of the time counting means is cleared every time an operation is performed. By starting from the current state and turning off the backlight when the count reaches the set time value, the backlight is turned off at a time value that corresponds to the operator's work, preventing the backlight from turning off unexpectedly. Moreover, since the light turns off automatically, it is possible to save power consumption.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is a block diagram of a calculator showing an embodiment of the present invention, and FIG. 2 is a flowchart of FIG. 1. The same reference numerals refer to the same objects throughout the design.

In FIG. 1, the main control section 1 has a calculation function that controls each section and performs calculation processing based on data stored in the data memory 4, and a function that controls blinking of the backlight 3a.

The operation unit 2 includes a numeric keypad 2a for inputting data, a function key 2b for instructing the contents of calculations, a backlight lighting key 2ct to be pressed when the display surface is dark, a lights-off key 2d for turning off the backlight 3a, and a switch after the operation is completed. backlight)
A setting key 2e is provided for instructing a setting mode when setting the lighting time value of 3a.

The display 3 is a display unit that is displayed using a liquid crystal.
It is configured to be illuminated by a backlight 3a from the back.

The data memory 4 is a memory in which data input from the operation unit 2 is stored. However, the setting code in setting mode is excluded.

The conversion memory 5 stores a time value T corresponding to a one-digit setting code.
is the memory in which is stored. For example, it corresponds as follows.

Setting code 1, 2.3.4. -・-9,0 time value T
(seconds') 6, 12.18.24. −−−−−−−−
54. The oO setting code is designated according to the content of the business, and different times are set depending on the code. The above setting cordro time value T=■ is a designation that the light is not turned off.

The setting time selection unit 6 selects the conversion memory 5 based on the setting code.
It has a function of selecting the time value T stored in the time value T and setting the time value T in the time calendar.

The time counter 7 is activated when the backlight lighting key 2c is pressed or a data input operation is performed, and the set time value T is subtracted and counted. It has a function of clearing and returning to the set value T, and sending a time-over signal to the backlight control unit 8 when the count reaches O.

The backlight control unit 8 turns on the bank light 3a by pressing the backlight lighting key 2c, and turns on the bank light 3a by pressing the backlight lighting key 2c.
It has a function of turning off the backlight 3a by pressing , or by inputting a time over signal from the time counter 7.

With such a configuration and function, the operation of backlight lighting control will be explained with reference to the flowchart in FIG.
Press e to specify the setting mode, and input the setting code using the numeric keypad 2a.

(2) Then, the set time selection section 6 selects the time value T of the conversion memory 50 and sets it in the time counter 7.

(2) Before starting the operation, the operator presses the backlight lighting key 2c to light the backlight 3a.

(2) Then, the counter 7 starts counting and subtracts from the time value T, but each time a key operation for data input is performed, the count is cleared and subtraction from the time value T is started again.

(2) If the light-off key 2d is pressed when the operation is completed, the backlight 3a will be turned off even during the counting process.

(2) When the light-off key 2d is not pressed and O is reached, a time-over signal is sent to the backlight control section 8.

(2) The backlight control unit 8 turns off the backlight 3a.

In this way, the lighting time of the backlight 3a can be selected according to the job, so there is no need to turn off the light unexpectedly and press the key again, and moreover, it is possible to save power consumption.

〔Effect of the invention〕

As explained above, according to the present invention, the backlight is turned off at a time value that corresponds to the operator's work, so it is possible to prevent the backlight from turning off at an unexpected time.Furthermore, since the backlight is turned off automatically, it is possible to save power consumption. This has the effect of being able to achieve this goal.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment according to the present invention, and FIG. 2 is a flowchart of FIG. 1. In the figure, engineering is the main control unit, 2a is the numeric keypad, 2b is the function key, 2c is the backlight on key, 2d is the off key, 2e is the setting key, 3 is the display, 3a is the backlight, 4 is the data memory, 5 6 is a conversion memory, 6 is a setting time selection section, 7 is a time counter, and 8 is a backlight control section. ” CIO θ G

Claims (1)

[Claims] A liquid crystal display section having a backlight, an operation section for operating and inputting data, and a data processing section for processing the data input from the operation section, the input data and the data being processed by the data processing section. The device displays the processed results on the liquid crystal display section, the device comprising: a designated input means for inputting a designated backlight lighting time value after the operation of the operation section is completed; and a time counting means for counting time from a predetermined initial state each time a time value is set and the operation is performed, and the backlight is turned on when the time counted by the time counting means reaches the set value. A liquid crystal display device characterized by turning off the light.