JP3450291B2 - LCD backlight control method for mobile phone - Google Patents

Description

BACKGROUND OF THE INVENTION [0001] [Technical Field of the Invention The present invention relates to the use of the mobile phone device L
Regarding the CD backlight control method, in particular, the mobile phone (P
DC, PHS, in including PDC + PHS MFP), the LCD display characters such as E-mail, by adjusting the lighting time of the LCD backlight, relates to a control method for a user-friendly mobile phone for the user, also, LC
The present invention relates to a method for controlling a mobile phone , which makes it possible to extend the battery life by adjusting the lighting time of a D backlight. 2. Description of the Related Art At present, e-mail and browser functions are added to mobile phones, and mobile phones are increasingly used as information terminals. However, in the current control of the LCD backlight, since the time is uniformly determined from the pressing of the button, the LCD backlight often disappears while reading a long sentence e-mail or the like. Tended to get worse. On the other hand, when an LCD backlight is provided, a large amount of current is applied to the LED in order to obtain luminance.
Therefore, simply increasing the lighting time shortens the battery life. Therefore, it is necessary to adjust the lighting time of the backlight according to the number of characters such as e-mails while considering the battery life. In order to achieve the above-mentioned demand, Japanese Unexamined Patent Publication No.
A terminal device disclosed in Japanese Patent No. 102173 is proposed. The technique disclosed in the above publication counts the number of characters to be displayed on the screen, and determines the lighting time of the backlight based on the number of characters to be displayed and the type of application being executed. The terminal device turns on the backlight for a long time when there are many characters, and turns off the backlight immediately when there are few characters to be displayed on the screen, thereby suppressing wasteful power consumption. [0008] However, the above-mentioned prior art includes an illumination time table in which the illumination time of the illumination means is stored stepwise, and the illumination means is based on the number of characters displayed on the display means. By reading the lighting time from the lighting time table, it is determined which of a plurality of stages the actual number of displayed characters belongs to, and the backlight or the like is determined by the time set corresponding to that stage. The lighting is on, for example, email,
When the browser function or the like is executed, there is a disadvantage that the number of characters to be displayed on the display unit increases and the display unit overflows. The present invention has been made in view of the above-mentioned conventional circumstances, and has been made to solve the above-described drawbacks inherent in the conventional technology. Therefore, an object of the present invention is to increase the number of characters to be displayed on a display unit. New LCD backlight control for mobile phone devices that can effectively cope with
It is to provide a method . Another object of the present invention is to provide a portable telephone (PD)
C, PHS, PDC + PHS multifunction machine)
By adjusting the lighting time of the LCD backlight according to the number of LCD display characters such as e-mails, it is possible to provide a user-friendly mobile phone, and by adjusting the lighting time of the LCD backlight, the battery life can be extended. New mobile phone device LCD
An object of the present invention is to provide a method for controlling light . In order to achieve the above object, a method for controlling an LCD backlight of a portable telephone according to the present invention is provided.
The LCD means for displaying received e-mails, clocks, etc., the backlight means for illuminating the LCD means, digit keys, etc.
Mobile phones (PDC, PHS, PDC + PH) having lighting time adjustment means for adjusting the lighting time of the CD backlight
The present invention is applied to a mobile phone having comparison determining means for comparing the number of characters to be displayed on the LCD means with the maximum number of display characters of the LCD means. [0012] Table in the LCD unit if the result of the comparison determination by the comparative determination means, which is the number of characters to be displayed on the LCD unit is determined to be greater than the maximum number of characters
And a scrolling means for scrolling by the user's key operation to display characters indicated. [0013] The backlight control method for a mobile phone according to the present invention comprises the following steps:
Comparing the number of characters displayed on the CD, and open on the LCD
If the number of characters to be displayed is smaller than the maximum number of displayed characters, the backlight is turned on for a lighting time corresponding to the number of characters. If the number of characters displayed on the LCD is larger than the maximum number of displayed characters, scroll down and right. , The backlight lighting time is changed according to the time of scrolling up and left . At the time of the upward scroll, a backlight is turned on for a lighting time corresponding to the maximum number of display characters,
At the time of downward scrolling, the backlight is turned on by further adding a lighting time corresponding to the number of newly displayed characters. When the left scroll is performed, the lighting time is not changed, and when the right scroll is performed, the backlight is further lit by further adding a lighting time corresponding to the number of newly displayed characters. Next, a preferred embodiment of the present invention will be described in detail with reference to the drawings. [0017] Figure 1 is a theory of one embodiment according to the present invention
FIG. 1 is a block diagram of a mobile phone to be described. [0018] Referring to FIG. 1 [Configuration of Embodiment], according to the present invention
Mobile phone 1 applied to LCD backlight control method 1
Reference numeral 1 denotes a radio unit 1 which performs transmission / reception and modulation / demodulation of radio data.
7. LCD unit for displaying received e-mail, clock, etc.
2. Digit key part 1 for dial input and character input
8. Backlight for illuminating LCD and digit keys 1
4, a timer section 1-5 for measuring a time such as a clock or a backlight lighting time, a memory section 1-6 used for data and data processing, and a control section 1-3 for controlling these elements. . FIG. 2 shows a main functional block configuration of the present invention among the control units 1-3 shown in FIG. In FIG. 2, the control section 1-3 includes a comparing and judging means 131 and a scroll means 132. The comparison determining means 131 includes a valid character number (display character number) N and a maximum display character number (displayable character number) Nma of the LCD 1-2.
x is input, and the magnitudes of the two are compared and determined. As a result of the comparison judgment by the comparison judgment means 131, when it is judged that the number of valid characters N> the maximum number of display characters Nmax, the comparison judgment means 131 switches the scroll means 13
2, a scroll signal 132 is activated by the control signal to scroll the characters displayed on the LCD 1-2. Next, the operation of an embodiment according to the present invention will be described. FIGS. 3 and 4 are flowcharts for explaining the operation of the embodiment according to the present invention. Referring to FIG. 1 and FIG. 3, step 2-1
In, the backlight unit 1-4 is controlled by turning on the power of the mobile phone to turn on the backlight (“ON”).
Let it. At this time, a default value (initial value) is input to the timer value T in order to determine the backlight lighting time. At the same time, the timer t is started by the timer section 1-5, and the display on the LCD (display section) 1-2 is turned "ON". Although the display is not specified, a standby screen or a wakeup screen is displayed (step 2).
-2). At this time, the timer t is a timer for counting the time during which the backlight is lit, and the timer timeout is timed out when the timer t is equal to the timer value T. The default value is defined as a lighting time during displaying a screen such as a standby screen or a menu that the user does not need to keep watching for a long time. In the present invention, the detailed time is not specified,
From the viewpoint of battery life, the time is shortened to several seconds to several tens of seconds. After the power of the portable telephone 1-1 is turned on, the portable telephone 1-1 enters a standby state, and transmission / reception of mail, Internet access by a browser, and voice communication are performed via the radio unit 1-7. The operation on the portable telephone 1-1 is performed through a digit key section 1-8. These determinations and operations are performed by the control unit 1-3 using the memory unit 1-6. Next, at step 2-3, it is determined by the user whether a key is pressed by the digit key section 1-8. If the result of determination in step 2-3 is that the key has not been pressed, it is determined in timer section 1-5 whether timer t has timed out (step 2-12). If the result of the determination in step 2-12 is that the timer t has timed out in the timer section 1-5, the timer t is stopped by the control section 1-3 and the backlight section 1-
4 to turn off the backlight ("OFF") (step 2-14). Next, if the result of determination in step 2-12 is that the timer t has not timed out, the timer t is counted up (step 2-13). In the key depression judgment in step 2-3,
When it is determined that the user has pressed the key, the backlight unit 1-4 is controlled to turn on the backlight (“O
N ") (step 2-4). At this time, if the backlight is turned on (" ON "), the backlight is kept turned on. It is determined whether or not the pressed key is the power supply “OFF.” As a result of the determination in step 2-5, the power supply “OF” is determined.
In the case of "F", the display of LCD1-2 is turned "OFF",
Turns off the backlight (“OFF”) and sets the timer t
Is stopped (step 2-11), and the process ends thereafter. Determination of power supply "OFF" (step 2-5)
If the pressed key is not the power "OFF" key, it is determined in step 2-6 whether the operation is a browser or mail operation or another operation. Here, the reason for the determination in step 2-6 is to determine whether the user needs time to read the contents, such as a browser or mail. That is, in the menu, the function setting, and the like, since the user presses the keys one after another, the lighting time of the backlight in response to the key press is not required much. Conversely, in a browser, mail, or the like, the backlight needs to be turned on while the user is reading the content. As a result of the determination in step 2-6, if it is determined that the key is a key other than the browser and the mail, the timer t of the timer section 1-5 is temporarily stopped, and a default value is input to the timer value T. The timer t is started again, the display is changed (step 2-7), and the flow proceeds to the key press determination in step 2-3. Conversely, if the result of the determination in step 2-6 is that the browser or mail key is determined, the timer t is stopped, the display on the LCD 1-2 is changed, and the browser or mail is changed to N (variable). Is input (the number of characters may exceed the maximum number of display characters on the LCD 1-2) (step 2-8). Next, in step 2-9, it is determined whether the number N of valid characters exceeds the maximum number Nmax of characters displayed on the LCD. If the result of the determination in step 2-9 is that the maximum number of display characters Nmax has not been exceeded, the backlight lighting time per character t1 × the number N of display characters is obtained by:
The timer value T of the timer t is determined, and the timer t is started (step 2-10). After that, the timer t times out or the timer t is newly reset by pressing a key, and the process proceeds to step 2-3. Here, the backlight lighting time t1 per character is not specified in the present invention, but may be set by a user or set by a mobile phone manufacturer. Settings are considered preferred. If the result of determination in step 2-9 is that the number of valid characters N exceeds the maximum number of display characters Nmax on the LCD, the process proceeds from FIG. 3A to FIG. 4 by using FIG. Will be explained. Referring to FIG. 4, the number of valid characters N is
If the maximum number of display characters Nmax is exceeded, LC
Since D1-2 displays the number of characters of the maximum display character number Nmax of the LCD, the timer value T includes the maximum display character number Nmax of the LCD × the backlight lighting time t1 per character (T = Nmax × t1). ) Is entered. afterwards,
The timer t of the timer section 1-5 is started (step 3-1). It is determined whether the user has finished reading the contents displayed on the LCD 1-2, restarted reading from the beginning, or has stopped halfway by pressing a key on the digit key section 1-8 (step 3-2). If the user does not perform the key operation in step 3-2, it is determined in step 3-6 whether the timer t has timed out. If so, the timer t is stopped and the backlight is turned off. (Step 3-8). If the result of determination in step 3-6 is that timer t has not timed out, timer t is counted up (step 3-7). If the result of determination in step 3-2 is that the user has pressed a key in digit key portion 1-8, it is determined whether the pressed key is a display scroll (step 3-3). If the result of determination in step 3-3 is that the key is other than display scrolling, the user has finished reading the content or has stopped in the middle, so the backlight from step B- 4 in FIG. Move to "ON". If the result of determination in step 3-3 is display scrolling, it is determined whether display scrolling is up or down (step 3-4). If the result of determination in step 3-4 is upward and left scroll, it is determined whether to scroll left or upward (step 3-9). If the result of determination in step 3-9 is that scrolling is to the left, the process proceeds to key pressing determination (step 3-2) without modifying the value of timer t. If the result of determination in step 3-9 is upward scrolling, it is determined that the user has confirmed the content again, and the timer t is restarted (return to step 3-1). If the result of determination in step 3-9 is downward and right scrolling, it is determined that the contents are being read, the display is changed, the new display character number is entered in the effective character number N, and the timer value T Is the remaining timer time + N × t1
(T = T−t + N × t1) is input, and the timer t is restarted (step 3-5). Thereafter, the process proceeds to key press determination (step 3-2). The present invention is constructed and operates as described above, and according to the present invention, the following effects can be obtained. By adjusting the lighting time of the backlight according to the number of valid characters in the browser or mail, the backlight is not turned off while reading the contents.
You can read the contents comfortably. By reducing the backlight lighting time in a situation where the digit key is depressed more frequently, such as an operation of a menu or a function setting, an unnecessary backlight can be turned off. By adjusting the lighting time of the backlight as a whole and uniformly determining the lighting time, it is possible to extend the battery life.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment according to the present invention. FIG. 2 is a functional block diagram of a main part of the control unit shown in FIG. 1 according to the present invention. FIG. 3 is a flowchart showing the operation of one embodiment according to the present invention. FIG. 4 is a flowchart showing an operation of one embodiment according to the present invention. [Description of Signs] 1-1: Cellular Phone 1-2 ... LCD (Display Unit) 1-3 ... Control Unit 1-4 ... Backlight Unit 1-5 ... Mima Unit 1-6 ... Memory Unit 1-7 ... Wireless Part 1-8: Digit key part 131: Comparison determination means 132: Scroll means

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification code FI G09G 3/20 680 G09G 3/20 680S 3/34 3/34 J H04M 1/73 H04M 1/73 H04Q 7/38 H04B 7 / 26 109T (58) Field surveyed (Int.Cl. ⁷ , DB name) G09G 3/00-3/38 G02F 1/13 505-580 H04Q 7/38 H04M 1/73

Claims (1)

(57) [Claims] [Claim 1] Received E-mail, L to display clock
CD means, LCD means, backlight means for illuminating the digit key, lighting time adjusting means for adjusting the lighting time of the LCD backlight by the number of LCD display characters of e-mail, and the number of characters to be displayed on the LCD means. Comparing and judging means for judging the maximum number of display characters of the LCD means; and
The number of characters displayed on the LCD means is larger than the maximum number of characters.
Displayed on the LCD means when it is determined to be larger
Scrolling of display characters by user key operation
LCD backlight system for mobile phone having roll means
In your method, the maximum number of displayable characters of the LCD, the LCD of the E-mail
The number of characters displayed on the LCD is compared with the number of characters displayed on the LCD.
When the number of displayed characters is smaller than the maximum number of displayed characters
, The backlight is turned on for the lighting time according to the number of characters
And the number of characters displayed on the LCD means is equal to the maximum
If the number of displayed characters is larger, scroll down and right,
Backlight lighting time according to scrolling up and left
When scrolling up to change the maximum display
Turn on the backlight with the lighting time according to the number of characters minutes,
When scrolling down, the number of newly displayed characters
Turn on the backlight by adding more lighting time,
When crawling, do not change the lighting time.
When rolled, when lighting according to the number of newly displayed characters
LCD backlight control method for mobile phones, characterized in that the backlight is turned on with an additional interval
Law.