CN1394101A

CN1394101A - Method and device for flashing back light of mobile telephone's LCD

Info

Publication number: CN1394101A
Application number: CN 01113248
Authority: CN
Inventors: 莫自治; 彭新淼
Original assignee: DABA INDUSTRY CO LTD SHANGHAI
Current assignee: DABA INDUSTRY CO LTD SHANGHAI
Priority date: 2001-07-04
Filing date: 2001-07-04
Publication date: 2003-01-29
Anticipated expiration: 2021-07-04
Also published as: CN1159937C

Abstract

The invention discloses the method and device for generating the back light twinkling of liquid crystal of the handset. The back light twinkling circuit of the device incldues the keyboard, the CPU, the driving circuit and the back light LED circuit. The method includes following steps. With the setting value input by the user being stored in the CPU, whether the input value is the input format for setting the back light twinkling of the LED is determined. If the condition of the input format is satisfied, the valve is transferred to the timing device. Based on the setting value input by the user, the timing device combining with the driving circuit controls the circuit of the back light LED. The invention enhances the practicability of the handset so as to locate the handset in night/dark place easily.

Description

A kind of method and apparatus of flashing back light of mobile telephone's LCD

Technical field

The present invention relates to a kind of method and apparatus of flashing back light of mobile telephone's LCD, can be applied to comprise in the electronic installation of band liquid crystal display such as mobile phone.

Backlight technology

It is the indispensable function of mobile phone that LCD backlight shows.It sees keyboard except making people clearly under the environment of dark, see liquid crystal display clearly when realizing normal running, but also can understand mobile phone state of living in from LCD backlight, thereby the user has more been increased convenience.But the prerequisite of using described function is the definite position that people know mobile phone, otherwise these facilitating functions are not known where to begin.Based on this, the LCD backlight technique for displaying of existing mobile phone is improved, under holding state, can flash the time and the blanking time of flashing of demonstration according to the program control LCD backlight.Thereby increase the diversity and the commutability of operating handset.Bringing use enjoyment to the user when, also help manipulating.

Main purpose of the present invention is, for the LCD liquid crystal display of mobile phone provides the method for program control flicker backlight, can make mobile phone realize backlight flashing with certain frequency within a certain period of time according to user's setting.

Another object of the present invention is, for the LCD liquid crystal display of mobile phone provides the device of program control flicker backlight, can make mobile phone realize backlight flashing with certain frequency within a certain period of time according to user's setting.So that mobile phone is under holding state, rapid convenient locating cellphone.Keeping under original cost, lift technique increases function, has high performance price ratio.

Summary of the invention

A kind of device of flashing back light of mobile telephone's LCD is characterized in that, is equiped with the circuit that flashes backlight on mobile phone, and the described circuit that flashes backlight comprises:

One keyboard is used for setting the frequency of flashing backlight according to certain format, and withdraws from the state that flashes backlight, recovers holding state;

One central processing unit links to each other with described keyboard, and this central processing unit receives the input value of keyboard, controls by its programmable I/O port;

One drive circuit links to each other with described central processing unit, is subjected to the control of central processing unit according to the keyboard input, and described drive circuit sends and drives order;

One led circuit backlight links to each other with described drive circuit, is subjected to the control of drive circuit, and is luminous according to described setpoint frequency.

A kind of method of flashing back light of mobile telephone's LCD may further comprise the steps:

(1) at first, the set point with user's input is stored in the central processing unit;

(2) judge whether this input value is to set the pattern of the input that LCD backlight is flashed;

(3) if satisfy the pattern of the input condition, this value is passed to timing device, described timing device is controlled led circuit backlight in conjunction with drive circuit according to the set point of user's input.

Disclosed program control scintillation technique backlight is applied to mobile phone according to the present invention, mainly is software and combination of hardware, and programming can realize control.The keyboard input is provided with the moment of flicker backlight, and time and light on and off are at interval.

Description of drawings

Below, with reference to accompanying drawing, for those skilled in the art that, from detailed description of the present invention, above-mentioned and other purposes of the present invention, feature and advantage will be apparent.

Fig. 1 is the block schematic diagram of apparatus of the present invention;

Fig. 2 is the hardware structure diagram of structure of the present invention;

Fig. 3 is the flow chart of the inventive method when implementing keyboard and being provided with;

Fig. 4 is the flow chart that the inventive method is implemented the timer break in service.

The present invention is a kind of method and apparatus of realizing that the mobile phone LCD backlight flashes, and the realization of its major function comprises that software flow and circuit two partly combine.

Embodiment

Device of the present invention, see also Fig. 1, with the central processing unit on the mobile phone (CPU) is the center, this central processing unit (CPU) is finished the scanning to keyboard 10, drive LCD backlight display circuit 13 by drive circuit 12, wherein comprise a timer in the central processing unit (CPU) 11, this timer has the certain basis time, and this basis time can be set or adjust.After the identification of display command backlight was finished in keyboard 10 scannings, demonstration backlight was to send control signal control Driver Circuit 12 by mobile phone central processing unit (CPU) 11 to realize.

Fig. 2 is the line map of LCD backlight display circuit among Fig. 1, and (as GPIO00, GPIO05 GPIO10) drives the LED branch road that three groups of LCD backlight show respectively to utilize the programmable I/O port of mobile phone central processing unit (CPU) 11.Here control the break-make of three LED branch roads with the triode 21,22,23 that programmable I/O port links to each other respectively as three switches,, control the scintillation time of demonstration backlight neatly simultaneously in conjunction with timer.Resistance R 286, R332 and R333 play the effect of current-limiting protection to triode 21,22,23 among Fig. 2, and its value will be enough to effectively drive the state turnover of triode.Three LED drive the effect that resistance R 287-R292, R294-R298, R338 on the branch road plays current-limiting protection LED.

After the cellphone subscriber passed through keyboard, enables liquid crystal flicker Presentation Function, whole LCD backlight was in illuminating state, then flashes the time rank of timer in the process by the keyboard setting, with parameter " XY " expression.This parameter " XY " assignment is given timer, when the timer counting has been expired, and CPU corresponding ports (GPIO00, GPIO05 and GPIO10) output high level or low level.When being output as high level, the triode conducting, its collector voltage is approximately zero, and this moment, fluorescent showed that the LED two ends form voltage difference, thereby lighted LED.When being output as low level, triode is in cut-off state, thereby LED is extinguished.

The operation principle of flashing demonstration about LCD backlight need be please in conjunction with Fig. 3 and Fig. 4.Fig. 3 is the flow chart by the cell phone keyboard setting up procedure, is called main program here.Fig. 4 is an invoked timer break in service among Fig. 3, or is called the flow chart that flashes service backlight, is called subprogram here.

At first the variable name that uses in the flow process of the present invention is described: Flag represents the timer interrupt service routine, and promptly the switch of subprogram identifies, and wherein Flag=0 represents to withdraw from the timer interrupt service routine, enters holding state (or step); Flag=1 represents to enter the timer interrupt service routine.ON/OFF represents backlight open or closes, and wherein represents to close during ON/OFF=0 backlight, represents to open backlight during ON/OFF=1.X represents one of user input values, and backlight function duration rank is opened in expression, and its value scope is 0～9; Y also is another input value of user, and the duration rank of backlight function is closed in expression, and its value scope is 0～9.ON_COUNT is the initial value of timer, and its value is decided according to the parameter of user's input, and is relevant with parameter X in the present embodiment, the time of corresponding backlight lightening, is called the timer value of lighting.OFF_COUNT represents the timer initial value, and its value is decided according to the parameter of user's input, and Y is relevant with parameter, the corresponding fall time backlight, is called the timer close value.

See also Fig. 3, the flow chart to the inventive method describes below.

(1) step 301, the cellphone subscriber imports by keyboard, enters the initial state of fluorescent screen flicker program;

(2) step 302, at this moment mobile phone enters holding state, and LCD backlight is lighted;

(3) step 303 judges simultaneously whether the user has other any keys of key entry, if do not key in other any keys, shows that the user does not plan to enter liquid crystal and flashes service, at this moment jumps to step 302, recovers holding state, and the user can realize other services as required;

(4) step 304: if there is key to press in the step 303, at this moment withdraw from the timer interrupt service routine, enter holding state;

(5) step 305: judge that whether the user presses key in step 304 form satisfies the LCD backlight of setting and flash service format messages, judge at first whether the position, end of input is " # ";

(6) step 306 if do not satisfy condition, is closed the program of flashing backlight;

(7) step 307 if satisfy condition, is then judged the frequency of setting of flashing, and the form of setting among this embodiment is " 0001XY ", and promptly " 0001 " is specific format, and what " XY " representative was set flashes the bright blanking time of putting out;

(8) step 308, at this moment timer interrupt program sign Flag=1 shows that the user need enter the service of flashing backlight;

(9) step 309, carry out the initialization before subprogram enters, promptly some parameters are carried out assignment, the timer value of lighting ON_COUNT=X wherein, the expression timer is set the initial value of backlight lightening, timer close value OFF_COUNT=Y, and the expression timer is set the initial value that extinguishes backlight, ON/OFF=1, backlight function is opened in expression simultaneously;

(10) step 310 is provided with basic time of timer, i.e. certain special time cycle at interval, repeat to call a sub-subroutine;

(11) step 311 is called timer interrupt program;

(12) step 312 changes over to from step 306, termination routine.

Then see also interrupt service routine flow chart shown in Figure 4.

Step 401 at first begins interrupt service routine; Step 402 judges that then backlight function opens or closes, and promptly judges identifier ON/OFF=0 or ON/OFF=1; Step 403, if ON/OFF=1, again and then judge whether the timer value of lighting ON_COUNT is 0, when calling first, this timer value of lighting ON_COUNT is the value of X; Step 405 is not equal to 0 if be judged as, i.e. expression is lighted and continued not finish, and judges that then timer interrupts sign Flag and whether equals 0, if Flag=0 then enters step 415 and withdraws from interrupt service routine, changes step 416 then over to, returns main program; If Flag is not equal to 0, enter step 408, the timer value of lighting ON_COUNT=(ON_COUNT-1), promptly the timer value of lighting ON_COUNT is from subtracting 1, and then program turns back to the main program of step 416; If in the judgement of step 403, the timer value of lighting ON_COUNT is 0, continues the value of variable X is composed the COUNT to the variable timer value of lighting ON, and promptly step 404 is then carried out ON/OFF=0 in step 405, promptly closes backlight function.

If Rule of judgment does not satisfy in step 402, promptly ON/OFF=0 judges whether timer close value OFF_COUNT is 0 again and then by step 409; If timer close value OFF_COUNT is not 0, then continue to judge in step 410 whether interrupt service routine sign Flag is 0; The flow process of lighting process to top timer is similar, if Flag=0 withdraws from interrupt service routine then by

step

415 and 416, returns main program; If the discontented foot of condition in the step 410, i.e. Flag=1, then timer close value OFF_COUNT is from subtracting 1, i.e. step 414, program is turned back to step 416 then; If Rule of judgment satisfies in step 409, promptly timer close value OFF_COUNT is 0, then continues the value of variable Y that the user is set and composes to variable OFF_COUNT, it is step 411, then enter step 412, variable ON/OFF=1 is set and opens backlightly, program turns back to step 416 then.

Method and apparatus of the present invention not only can be applied to field of mobile phones, can also be applied to have the electronic equipment of input set-up function and Presentation Function, even can also relate to toy industry, various fields such as caution system.

The front provides the description to preferred embodiment, so that any technical staff in this area can use or utilize the present invention.Various modifications to these embodiment are conspicuous to those skilled in the art, can be applied to other embodiment to total principle described here and not use creativeness.Thereby, the embodiment shown in the present invention will be not limited to here, and the wide region of principle that should disclose and new feature according to meeting here.

Claims

1, a kind of device of flashing back light of mobile telephone's LCD is characterized in that, is equiped with the circuit that flashes backlight on mobile phone, and the described circuit that flashes backlight comprises:

2, the device of flashing back light of mobile telephone's LCD according to claim 1 is characterized in that, described drive circuit comprises some groups of switch elements compositions.

3, the device of flashing back light of mobile telephone's LCD according to claim 2 is characterized in that, described switch element is a triode.

4, the device of flashing back light of mobile telephone's LCD according to claim 1 is characterized in that, the described circuit that flashes backlight further comprises a timer, and described timer is controlled lighting and the fall time of described led circuit backlight on the time of basis.

5, timer according to claim 4 is characterized in that, the basic time of described timer can be set.

6, a kind of method of flashing back light of mobile telephone's LCD may further comprise the steps:

7, flashing back light of mobile telephone's LCD method according to claim 6, it is characterized in that, described method further comprises, set the time of regularly lighting and fall time regularly in the described timing device, described timing is lighted and timing fall time and described user to key in the input set point when flashing form backlight relevant.

8, flashing back light of mobile telephone's LCD method according to claim 6 is characterized in that, if do not satisfy input LCD backlight form, closes LCD backlight and flashes.

9, flashing back light of mobile telephone's LCD method according to claim 6 is characterized in that, sets according to the user, and described timing device provides a basic time, and the described basis time is used for controlling the time of regularly lighting and regularly extinguishing.