CN102385836A - Control method, control device and control system of backlight brightness - Google Patents
Control method, control device and control system of backlight brightness Download PDFInfo
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- CN102385836A CN102385836A CN201010267113XA CN201010267113A CN102385836A CN 102385836 A CN102385836 A CN 102385836A CN 201010267113X A CN201010267113X A CN 201010267113XA CN 201010267113 A CN201010267113 A CN 201010267113A CN 102385836 A CN102385836 A CN 102385836A
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Abstract
The invention provides a control method, a control device and a control system of backlight brightness. According to the invention, a control instruction is transmitted to a backlight driving device through a single bus for controlling the backlight brightness. The control method comprises the following steps of: transmitting a control instruction for adjusting the backlight brightness; acquiring a feedback instruction obtained according to the control instruction; judging whether a pulse signal periodicity of the control instruction is equal to that of the feedback instruction or not; and when the pulse signal periodicity of the control instruction is unequal to that of the feedback instruction, retransmitting the control instruction. According to the control method, the control device and the control system, the effect for controlling the backlight brightness can be improved and the stability of the system can be improved.
Description
Technical field
The invention belongs to the backlight control technical field, relate in particular to a kind of backlight brightness control method, control device and control system.
Background technology
Backlight is a kind of form of illumination, mainly is in order to be increased in the illuminance in the low light source environment, often to be used on the LCD, such as the display of mobile phone, and the display of computer, display of vehicle-carrying DVD or the like.
In the backlight circuit design of mobile phone, backlight drive device is connected with the control device of mobile phone through a bus usually at present.The control device of mobile phone is given said backlight drive device through this bus sending controling instruction, the output current size of the pulse signal cycle numerical control system backlight drive device through steering order, thus control the backlight illumination of mobile telephone display.
Existing backlight drive device requires generally strict to sequential, the low level of the high-low level time of pulse signals and order fulfillment all will explicitly call for time delay.But through existing control system; If backlight drive device is when receiving instruction; If backlight brightness control devices takes place to interrupt or task is switched, the signal that backlight drive device is received is kept a unpredictable time at a level, if the time of keeping surpasses the concluding time of instruction; Backlight drive device thinks that just receiving instruction finishes; The situation that the instruction error of transmission occurs is controlled the backlight illumination of display according to the false command that receives, and this backlight of display occur and does not work or the incorrect phenomenon of gray scale in the use of mobile phone.If order the interrupt instruction of forbidding control device and send, less stable the situation that mobile phone crashes will appear.
Summary of the invention
The present invention provides a kind of and can improve backlight brightness control method, control device and the control system of controlling the backlight illumination effect and improving system stability for solving the instruction error of transmission and the problem of less stable that exists in the prior art.
The present invention provides a kind of backlight brightness control method,, may further comprise the steps to backlight drive device sending controling instruction control backlight illumination through unibus:
Send the steering order of regulating backlight illumination;
Obtain the feedback command that obtains according to said steering order;
Whether the pulse signal cycle number of more said steering order equals the pulse signal cycle number of said feedback command;
When the pulse signal cycle that is not equal to feedback command when the pulse signal cycle number of said steering order is counted, send said steering order once more.
The present invention also provides a kind of backlight brightness control devices, and to backlight drive device sending controling instruction control backlight illumination, said control device comprises instruction sending module, instruction acquisition module and comparison module through unibus;
Instruction sending module is used to send the steering order of regulating backlight illumination, and sends said steering order once more according to the comparative result of comparison module;
The instruction acquisition module is used to obtain the feedback command that the steering order according to instruction sending module obtains;
Compare control module; Whether the pulse signal cycle number that is used for more said steering order equals the pulse signal cycle number of said feedback command; When the pulse signal cycle that is not equal to feedback command when the pulse signal cycle number of said steering order was counted, then the steering order sending module sent said steering order once more.
The present invention also provides a kind of backlight brightness control system, comprises the control device and the backlight drive device that connect through unibus, wherein,
Said control device; Be used for sending the steering order of regulating backlight illumination to backlight drive device; Obtain the feedback command that obtains according to said steering order; And whether the pulse signal cycle number of more said steering order equal the pulse signal cycle number of said feedback command, and the pulse signal cycle that is not equal to feedback command when the pulse signal cycle number of said steering order sends said steering order when counting once more;
Said backlight drive device is used for output current being set with the adjusting backlight illumination according to the steering order that receives, and when receiving steering order, sends feedback command to said control device.
Can find out from the controlling schemes of backlight illumination of the present invention; Whether equal the pulse signal cycle number of said feedback command through the pulse signal cycle number of more said steering order; And when inaccurate, send said steering order once more to backlight drive device; Since can be in time when inaccurate sending controling instruction once more, so backlight drive device can be according to the steering order backlight illumination that upgrades in time, again because to send the time interval of twice steering order extremely short; Therefore the user is difficult for discovering, and can improve stability that user experience and above-mentioned feedback mechanism can improve system and crash preventing.
Description of drawings
Fig. 1 is the process flow diagram of first kind of embodiment of control method of the present invention;
Fig. 2 is the process flow diagram of second kind of embodiment of control method of the present invention;
Fig. 3 is the process flow diagram of the third embodiment of control method of the present invention;
Fig. 4 is a kind of example structure block diagram of control device of the present invention;
Fig. 5 is a kind of example structure block diagram of control system of the present invention.
Embodiment
Clearer for technical matters, technical scheme and beneficial effect that the present invention is solved, below in conjunction with accompanying drawing and embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
As shown in Figure 1, the present invention provides the backlight brightness control method of a kind of embodiment,, may further comprise the steps to backlight drive device sending controling instruction control backlight illumination through unibus:
Step S01 sends the steering order of regulating backlight illumination;
Step S02 obtains the feedback command that obtains according to said steering order;
Step S03, the pulse signal cycle of more said steering order count the pulse signal cycle whether L equal said feedback command and count a, when the pulse signal cycle of said steering order is counted pulse signal cycle that L is not equal to feedback command and counted a, get into step S04;
Step S04 sends the steering order of regulating backlight illumination once more.
In above-mentioned steps S03; Because the pulse signal cycle number in the feedback command is different with the pulse signal cycle number in the said steering order; Explanation steering order in transmission course makes a mistake; Therefore get into step S04 once more to said backlight drive device sending controling instruction; Make backlight drive device in time backlight illumination is updated to correct gray scale, and the pulse signal cycle number in the feedback command is when identical with pulse signal cycle number in the said steering order, then said backlight drive device is regulated backlight illumination according to correct steering order.Therefore whether equal the pulse signal cycle number of said feedback command through the pulse signal cycle number of more said steering order; And when inaccurate, send said steering order once more to backlight drive device; Since can be in time when inaccurate sending controling instruction once more; Therefore backlight drive device can be according to the steering order backlight illumination that upgrades in time; Because to send the time interval of twice steering order extremely short, the user is difficult for discovering again, therefore can improve stability that user experience and above-mentioned feedback mechanism can improve system and crash preventing.
Further, send the steering order of regulating backlight illumination, be specially:
Set the pulse signal cycle of steering order and count L;
The interior level of pulse signal cycle of setting said steering order is first level and in the first setting-up time T1, sends this pulse signal;
The interior level of pulse signal cycle of setting said steering order is second level and in the second setting-up time T2, sends this pulse signal;
After the pulse signal of said steering order second level sent end, the periodicity L that calculates pulse signal was from subtracting one;
Whether the periodicity L that judges the pulse signal that calculates equals 0;
When the periodicity L of the pulse signal that calculates equals 0, stop to generate said steering order;
When the periodicity L of the pulse signal that calculates is not equal to 0, carry out the transmission of said next periodic pulse signal of steering order.
Further, the said feedback command that obtains according to said steering order that obtains is specially:
Read the pulse signal of said feedback command;
When the pulse signal of said feedback command is first level, set the pulse signal cycle of said feedback command and count a, a is from adding one, and the initial value of a equals 0, and delay control three setting-up time T3; When the pulse signal of said feedback command is second level, delay control four setting-up time T4;
Judge that said pulse signal is time of second level whether to surpass the 5th setting-up time T5;
When said pulse signal is when time of second level surpassing the 5th setting-up time T5, read the pulse signal of said feedback command of following one-period.
Further, said transmission is regulated after the steering order of backlight illumination, also comprises:
Send interrupt instruction and detect said feedback command;
When said pulse signal when said feedback command is first level, sets the pulse signal cycle of said feedback command and count a, a is from adding one, and the initial value of a equals 0, and delay control three setting-up time T3; When the pulse signal of said feedback command is second level, after the delay control four setting-up time T4, also comprise:
The pulse signal of setting said feedback command is second level.
In the present embodiment, said first level is a high level, and said second level is a low level, and said first level is a low level certainly, and said second level is that high level also is fine, and can specifically be provided with according to actual conditions.
In practical implementation, the first setting-up time T1, the second setting-up time T2; The 3rd setting-up time T3, the 4th setting-up time T4 and the 5th setting-up time T5 can be provided with according to actual conditions are concrete, under the preferable case: the first setting-up time T1; The span of the second setting-up time T2 is: 0.5-500us; The 3rd setting-up time T3, the span of the 4th setting-up time T4 is: 100-200us, the 5th setting-up time T5 span is: 1-3ms.Because pulse signal needs high level and low level alternate in one-period, and pulse signal is then explained the output pulse signal end when maintaining a certain level always.
In practical implementation, can also further optimize the foregoing description.Fig. 2 is the process flow diagram of second kind of embodiment of control method of the present invention, is sending controling instruction in a looping fashion, the control method of reading command in a looping fashion, specifically may further comprise the steps:
Step S201 according to user's input signal, sets the pulse signal cycle of steering order and counts L;
Step S202, setting pulse signal are high level and postpone setting-up time T;
Step S203, setting pulse signal are low level and postpone setting-up time T;
Step S204 sets current pulse signal and sends periodicity i, i++, and the initial value of i equals 1;
Step S205 calculates the current residual pulse signal cycle and counts L
I+1=L
i-1;
Step S206, judgement current residual pulse signal cycle is counted L
I+1Whether equal 0,, get into step S207, if judged result for not the time, gets into step S202 if judged result is when being;
Step S207 stops to generate said steering order, explains to generate complete steering order;
Step S208 reads the pulse signal of said feedback command;
Step S209; Whether the pulse signal of judging said feedback command is high level, if judged result is when being, gets into step S210, if judged result for not the time, gets into step S211;
Step S210 sets the pulse signal cycle of said feedback command and counts a, a++, and the initial value of a equals 0, gets into step S211;
Step S211 postpones setting-up time T;
Step S212 judges that said pulse signal is the low level time whether to surpass the 5th setting-up time T5, if judged result when being, gets into step S213, if judged result for not the time, entering step S208;
Step S213, relatively the pulse signal cycle of steering order is counted the pulse signal cycle whether L equal feedback command and is counted a, counts a if the pulse signal cycle of steering order is counted the pulse signal cycle that L is not equal to feedback command, gets into step S201; If comparative result is when being, get into step S214.
Step S214 explains that steering order do not make mistakes EOP (end of program) in transmission course.
In practical implementation, can also further optimize the foregoing description.Fig. 3 is the process flow diagram of the third embodiment of control method of the present invention, is with the difference of second embodiment: read the control method of feedback command with interrupt mode, specifically may further comprise the steps:
Step S301 according to user's input signal, sets the pulse signal cycle of steering order and counts L;
Step S302, setting pulse signal are high level and postpone setting-up time T;
Step S303, setting pulse signal are low level and postpone setting-up time T;
Step S304 sets current pulse signal and sends periodicity i, i++, and the initial value of i equals 1;
Step S305 calculates the current residual pulse signal cycle and counts L
I+1=L
i-1;
Step S306, judgement current residual pulse signal cycle is counted L
I+1Whether equal 0,, get into step S307, if judged result for not the time, gets into step S201 if judged result is when being;
Step S307 stops to generate said steering order, explains to generate complete steering order;
Step S308 sends interrupt instruction, gets into step S309;
Step S309 judges whether to detect feedback command, if judged result gets into step S310 for being, if judged result is returned and got into step S309 for not;
Step S310 reads the pulse signal of said feedback command;
Step S311; Whether the pulse signal of judging said feedback command is high level, if judged result is when being, gets into step S312, if judged result for not the time, gets into step S313;
Step S312 sets the pulse signal cycle of said feedback command and counts a, a++, and the initial value of a equals 0, gets into step S313;
Step S313 postpones setting-up time T;
Step S314, the pulse signal of setting said feedback command is a low level;
Step S315 judges that said pulse signal is the low level time whether to surpass the 5th setting-up time T5, if judged result when being, gets into step S316, if judged result for not the time, entering step S309;
Step S316, relatively the pulse signal cycle of steering order is counted the pulse signal cycle whether L equal feedback command and is counted a, counts a if the pulse signal cycle of steering order is counted the pulse signal cycle that L is not equal to feedback command; Get into step S301; If comparative result is when being, get into step S317
Step S317 says that steering order do not make mistakes EOP (end of program) in transmission course.
In the present embodiment, the first setting-up time T1 equals the second setting-up time T2 and equals setting-up time T, and promptly the time of pulse signal high level equated with the said low level time, was convenient to the control of system to the time.When reading pulse signal, the time that high level and low level postpone, promptly the 3rd setting-up time T3 equals the 4th setting-up time T4 and also equals setting-up time T.
For step S205 and step S305, such as L
1=7, the pulse signal cycle number of promptly setting steering order is 7, because step S202 and step S203 have formed the pulse signal of one-period, therefore also need form the pulse signal in 6 cycles, i.e. L
2=L
1-1.
For step S308 and step S309; Because backlight drive device receives interrupt instruction, backlight drive device just quits work, and also just stops to export feedback command certainly; System is in waiting status, could confirm up to detecting feedback command whether the steering order of output is correct.Generally speaking, the interrupt instruction that backlight drive device receives is the pulse signal of high level,
For step S210 and step S312; Because system then explains the signal that receives a recurrence interval according to receiving high level signal; Therefore be then to represent to receive a recurrence interval with the pulse signal that receives a high level when reading the pulse signal of feedback command, just the pulse signals periodicity is counted.
For step S314; Because the interrupt instruction that backlight drive device receives is the pulse signal of high level; And system can the identification pulse signal be the time length of high level; After backlight drive device had sent feedback command, must need the pulse signal of the said feedback command of setting was low level, and system confirms through calculating whether feedback command finishes low level time delay.
For step S315; Because pulse signal needs high level and low level alternate in one-period; And pulse signal when maintaining a certain level always; Explain that then output pulse signal finishes, therefore said pulse signal is the low level time to surpass the 5th setting-up time T5, explains that then output pulse signal finishes.
For step S214 and step S317, EOP (end of program), then the correctness of steering order in transmission course confirmed in explanation, the size that the backlight illumination device is regulated its output current according to correct steering order, thereby control backlight illumination.
In order to realize the adjusting to backlight illumination, the present invention also provides the control device of a kind of embodiment, and is as shown in Figure 4, and said control device comprises instruction sending module 1, instruction acquisition module 2 and compares control module 3;
Instruction sending module 1 is used to send the steering order of regulating backlight illumination, and sends said steering order once more according to the comparative result of comparison module;
Instruction acquisition module 2 is used to obtain the feedback command that the steering order according to instruction sending module 1 obtains;
Compare control module 3; Whether the pulse signal cycle number that is used for more said steering order equals the pulse signal cycle number of said feedback command; When the pulse signal cycle that is not equal to feedback command when the pulse signal cycle number of said steering order was counted, then steering order sending module 1 sent said steering order once more.
Whether equal the pulse signal cycle number of said feedback command through the pulse signal cycle number of more said steering order; And when inaccurate, send said steering order once more to backlight drive device; Since can be in time when inaccurate sending controling instruction once more; Therefore backlight drive device can be according to the steering order backlight illumination that upgrades in time; Because to send the time interval of twice steering order extremely short, the user is difficult for discovering again, therefore can improve stability that user experience and above-mentioned feedback mechanism can improve system and crash preventing.
Further, in order to realize the concrete control to backlight illumination, said instruction sending module 1 comprises setting value unit, generation unit and transmitting element;
The setting value unit, the pulse signal cycle that is used to set steering order is counted L;
Generation unit is used to generate the formed steering order of being made up of first level that postpones first setting-up time and second level that postpones second setting-up time of pulse signal in L cycle;
Transmitting element is used to send the steering order that said generation unit generates.
Further, in order to realize the concrete control to backlight illumination, said instruction acquisition module 2 comprises reading unit, the first judgement control module and the second judgement control module;
Reading unit is used to read the pulse signal of said feedback command;
First judges control module, is used to judge whether the pulse signal of said feedback command is first level, when the pulse signal of said feedback command is first level; Set the pulse signal cycle of said feedback command and count a; A is from adding one, and the initial value of a equals 0, and delay control three setting-up times; When the pulse signal of said feedback command is second level, delay control four setting-up times;
Second judges control module; Be used for when arriving time delay; Judge that said pulse signal is time of second level whether to surpass the 5th setting-up time; And when said pulse signal is that the control reading unit continues to read the pulse signal of said feedback command when time of second level surpassing the 5th setting-up time.
Further, said control device also comprises: interrupt sending module 5 and detection module 6;
Interrupt sending module 5, be used for behind instruction sending module 1 sending controling instruction, send interrupt instruction;
Detection module 6 after being used for said interruption sending module 5 and sending said interrupt instruction, detects said feedback command;
Said first judges that control module also is used for after the pulse signal of the said feedback command of control is the first level delay control, three setting-up times or after the pulse signal of the said feedback command of control was the second level delay control, four setting-up times, the pulse signal of controlling said feedback command was second level.
The present invention also provides the backlight control system of a kind of embodiment, and is as shown in Figure 5, comprises the control device 10 and backlight drive device 11 that connect through unibus, wherein:
Said control device; Be used for sending the steering order of regulating backlight illumination to backlight drive device; Obtain the feedback command that obtains according to said steering order; And whether the pulse signal cycle number of more said steering order equal the pulse signal cycle number of said feedback command, and the pulse signal cycle that is not equal to feedback command when the pulse signal cycle number of said steering order sends said steering order when counting once more;
Said backlight drive device is used for output current being set with the adjusting backlight illumination according to the steering order that receives, and when receiving steering order, sends feedback command to said control device.
Control device among the present invention is following to the concrete control of backlight illumination: instruction sending module 1 sending controling instruction is given backlight drive device 11; Said backlight drive device 11 generates feedback command according to said steering order; Send to control device 10; 2 pairs of feedback commands of the instruction acquisition module of control device 10 read, and through the pulse signal cycle number in the comparison steering order and the pulse command periodicity of feedback command, the explanation steering order does not make a mistake in transmission course when periodicity is consistent; Said backlight drive device 11 is provided with its output current according to correct steering order; Thereby realize backlight illumination control is explained then that when periodicity is inconsistent steering order makes a mistake in transmission course, control device 10 continues sending controling instruction and gives backlight drive device 11.
The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. a backlight brightness control method is characterized in that,, may further comprise the steps to backlight drive device sending controling instruction control backlight illumination through unibus:
Send the steering order of regulating backlight illumination;
Obtain the feedback command that obtains according to said steering order;
Whether the pulse signal cycle number of more said steering order equals the pulse signal cycle number of said feedback command;
When the pulse signal cycle that is not equal to feedback command when the pulse signal cycle number of said steering order is counted, send said steering order once more.
2. control method as claimed in claim 1 is characterized in that, sends the steering order of regulating backlight illumination, is specially:
Set the pulse signal cycle of steering order and count L;
The interior level of pulse signal cycle of setting said steering order is first level and in first setting-up time, sends this pulse signal;
The interior level of pulse signal cycle of setting said steering order is second level and in second setting-up time, sends this pulse signal;
After the pulse signal of said steering order second level sent end, the periodicity L that calculates pulse signal was from subtracting one;
Whether the periodicity L that judges the pulse signal that calculates equals 0;
When the periodicity L of the pulse signal that calculates equals 0, stop to generate said steering order;
When the periodicity L of the pulse signal that calculates is not equal to 0, carry out the transmission of said next periodic pulse signal of steering order.
3. according to claim 1 or claim 2 control method is characterized in that the said feedback command that obtains according to said steering order that obtains is specially:
Read the pulse signal of said feedback command;
When level is first level in the pulse signal cycle of said feedback command, set the pulse signal cycle of said feedback command and count a, a is from adding one, and the initial value of a equals 0, and delay control three setting-up times; When level is second level in the pulse signal cycle of said feedback command, delay control four setting-up times;
Judge that said pulse signal is time of second level whether to surpass the 5th setting-up time;
When said pulse signal is when time of second level surpassing the 5th setting-up time, read the pulse signal of said feedback command of following one-period.
4. control method as claimed in claim 3 is characterized in that, said transmission is regulated after the steering order of backlight illumination, also comprises:
Send interrupt instruction and detect said feedback command;
When said pulse signal when said feedback command is first level, sets the pulse signal cycle of said feedback command and count a, a is from adding one, and the initial value of a equals 0, and delay control three setting-up times; When the pulse signal of said feedback command is second level, after delay control four setting-up times, also comprise:
The pulse signal of setting said feedback command is second level.
5. a backlight brightness control devices is characterized in that, to backlight drive device sending controling instruction control backlight illumination, said control device comprises instruction sending module, instruction acquisition module and comparison module through unibus;
Instruction sending module is used to send the steering order of regulating backlight illumination, and sends said steering order once more according to the comparative result of comparison module;
The instruction acquisition module is used to obtain the feedback command that the steering order according to instruction sending module obtains;
Compare control module; Whether the pulse signal cycle number that is used for more said steering order equals the pulse signal cycle number of said feedback command; When the pulse signal cycle that is not equal to feedback command when the pulse signal cycle number of said steering order was counted, then the steering order sending module sent said steering order once more.
6. control device as claimed in claim 5 is characterized in that said instruction sending module comprises setting value unit, generation unit and transmitting element;
The setting value unit, the pulse signal cycle that is used to set steering order is counted L;
Generation unit is used to generate the formed steering order of being made up of first level that postpones first setting-up time and second level that postpones second setting-up time of pulse signal in L cycle;
Transmitting element is used to send the steering order that said generation unit generates.
7. control device as claimed in claim 6 is characterized in that, said instruction acquisition module comprises reading unit, the first judgement control module and the second judgement control module;
Reading unit is used to read the pulse signal of said feedback command;
First judges control module, is used to judge whether the pulse signal of said feedback command is first level, when the pulse signal of said feedback command is first level; Set the pulse signal cycle of said feedback command and count a; A is from adding one, and the initial value of a equals 0, and delay control three setting-up times; When the pulse signal of said feedback command is second level, delay control four setting-up times;
Second judges control module; Be used for when arriving time delay; Judge that said pulse signal is time of second level whether to surpass the 5th setting-up time; And when said pulse signal is that the control reading unit continues to read the pulse signal of said feedback command when time of second level surpassing the 5th setting-up time.
8. control device as claimed in claim 7 is characterized in that, said control device also comprises: interrupt sending module and detection module;
Interrupt sending module, be used for behind the instruction sending module sending controling instruction, send interrupt instruction;
Detection module after being used for said interruption sending module and sending said interrupt instruction, detects said feedback command;
Said first judges that control module also is used for after the pulse signal of the said feedback command of control is the first level delay control, three setting-up times or after the pulse signal of the said feedback command of control was the second level delay control, four setting-up times, the pulse signal of controlling said feedback command was second level.
9. a backlight control system is characterized in that, comprises the control device and the backlight drive device that connect through unibus, wherein:
Said control device; Be used for sending the steering order of regulating backlight illumination to backlight drive device; Obtain the feedback command that obtains according to said steering order; And whether the pulse signal cycle number of more said steering order equal the pulse signal cycle number of said feedback command, and the pulse signal cycle that is not equal to feedback command when the pulse signal cycle number of said steering order sends said steering order when counting once more;
Said backlight drive device is used for output current being set with the adjusting backlight illumination according to the steering order that receives, and when receiving steering order, sends feedback command to said control device.
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