CN103957627B - The method controlling display lamp brightness - Google Patents
The method controlling display lamp brightness Download PDFInfo
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Abstract
The present invention relates to the method controlling display lamp brightness.If the technical problem to be solved is that in prior art, electronic equipment does not comprise PWM port, or PWM port is occupied, then cannot the brightness of display lamp be controlled.The technical solution adopted for the present invention to solve the technical problems is the method controlling display lamp brightness, comprises the following steps: based on the ratio between present intensity controlling value and the high-high brightness controlling value of display lamp, it is thus achieved that output brightness dutycycle；Based on the cycle frequency of described output brightness dutycycle and output brightness dutycycle, by cycle rate counter and intervalometer, it is thus achieved that pulse signal；Described pulse signal is utilized to control the switch of display lamp, to realize the control to display lamp brightness.
Description
Technical field
The present invention relates to display lamp control field, the method especially relating to control display lamp brightness.
Background technology
Generally, being all provided with standby indicating lamp on an electronic device, when electronic equipment is in holding state, display lamp lights, to point out consumer electronic devices to be in holding state.At night, owing to ambient light is dimmed, user can think that display lamp becomes brighter compared with daytime, is unfavorable for the rest of user.
In the prior art, on the one hand, the method of change hardware parameter can be adopted to control the brightness of display lamp, but, if changing the outer casing mold of electronic equipment, the display lamp brightness that then may result in having mixed up changes, then, it is necessary to again hardware parameter is adjusted, it is adjusted hardware parameter causing the components and parts in electronic equipment to change, therefore, the method is used to be adjusted being unfavorable for the production in enormous quantities of electronic equipment to the brightness of display lamp.
On the other hand, the brightness of display lamp is controlled, owing to electronic equipment self comprises the restriction of device, it is possible to do not contain PWM port according to the mode controlling PWM port, or PWM port is occupied, all the brightness of display lamp cannot be controlled under both of these case.
Summary of the invention
If the technical problem to be solved is that in prior art, electronic equipment does not comprise PWM port, or PWM port is occupied, then cannot the brightness of display lamp be controlled.
For solving above-mentioned technical problem, the present invention provides the method controlling display lamp brightness, comprises the following steps:
Based on the ratio between present intensity controlling value and the high-high brightness controlling value of display lamp, it is thus achieved that output brightness dutycycle；
Based on the cycle frequency of described output brightness dutycycle and output brightness dutycycle, by cycle rate counter and intervalometer, it is thus achieved that pulse signal；
Described pulse signal is utilized to control the switch of display lamp, to realize the control to display lamp brightness.
Further, described cycle rate counter associates with described intervalometer.
Further, based on the cycle frequency of described output brightness dutycycle and output brightness dutycycle, by cycle rate counter and intervalometer, it is thus achieved that pulse signal, comprise the following steps:
Based on described output brightness dutycycle, it is determined that the initial count value of described cycle rate counter and threshold value；
Based on described initial count value and described cycle frequency, it is determined that the base during timing of described intervalometer；
The base work when intervalometer is with described timing, and when cycle rate counter counts with initial count value, whether the count value of cycle criterion cycle rate counter is more than described threshold value；
When described count value is more than threshold value, export the first level signal.
Further, after whether the count value of cycle criterion cycle rate counter is more than described threshold value, including step:
When described count value is less than or equal to threshold value, exporting second electrical level signal, wherein, described second electrical level signal and described first level signal are contrary level signal.
Further, based on the cycle frequency of described output brightness dutycycle and output brightness dutycycle, by cycle rate counter and intervalometer, it is thus achieved that pulse signal, comprise the following steps:
Give described cycle rate counter using described maximum brightness value controlling value as initial count value, meanwhile, give cycle rate counter using described present intensity controlling value as threshold value；
Based on described initial count value and described cycle frequency, it is determined that the base during timing of described intervalometer；
The base work when intervalometer is with described timing, and when cycle rate counter counts with initial count value, whether the count value of cycle criterion cycle rate counter is more than described threshold value；
When described count value is more than threshold value, export three level signal.
Further, after whether the count value of cycle criterion cycle rate counter is more than described threshold value, including step:
When described count value is less than or equal to threshold value, exporting the 4th level signal, wherein, described 4th level signal and described three level signal are contrary level signal.
Further, before obtaining pulse signal, comprise the following steps:
Determine described cycle frequency；
Judge that whether cycle frequency is less than the first cycle frequency.
Further, when described cycle frequency is less than the first cycle frequency, based on the cycle frequency of described output brightness dutycycle and output brightness dutycycle, by cycle rate counter and intervalometer, it is thus achieved that pulse signal, comprise the following steps:
Based on described output brightness dutycycle, determined the counting sequence of cycle rate counter by interval mode；
Based on described counting sequence and described cycle frequency, it is determined that the base during timing of described intervalometer；
When intervalometer is with described timing during base work, including the pulse signal of the 5th level signal and the 6th level signal with the output of described counting sequence, wherein, described 5th level signal and described 6th level signal are contrary level signal.
Further, described first cycle frequency is be more than or equal to 100Hz.
The invention has the beneficial effects as follows: generate pulse signal by cycle rate counter and intervalometer, recycle this pulse signal and control the switch of display lamp, thus, achieve the control to display lamp brightness, it is to avoid electronic equipment is absent from PWM port or PWM port is occupied and situation about cannot display lamp brightness be controlled；
Utilize present intensity controlling value and high-high brightness controlling value to realize output brightness dutycycle so that output brightness dutycycle to realize process simple, it is not necessary to by complicated calculating process, decrease the task amount that central processing unit processes；
Owing to cycle frequency is when less than 100Hz, eye-observation to display lamp brightness can there is flickering, therefore, set the first cycle frequency be more than or equal to 100Hz, when cycle frequency is less than the first cycle frequency, output brightness dutycycle is realized, it is ensured that the display lamp that human eye is watched is absent from flickering with interval mode.
Accompanying drawing explanation
Fig. 1 is the flow chart that the present invention controls the method for display lamp brightness；
Fig. 2 is the fundamental diagram of cycle rate counter of the present invention；
Fig. 3 a is that in one cycle of the present invention, output brightness dutycycle is 90% and TbIt it is the schematic diagram of the pulse signal of 100 μ s；
Fig. 3 b is that in one cycle of the present invention, output brightness dutycycle is 50% and TbIt it is the schematic diagram of the pulse signal of 100 μ s；
Fig. 3 c is that in one cycle of the present invention, output brightness dutycycle is 50% and TbIt it is the schematic diagram of the pulse signal of 200 μ s；
Fig. 4 a is the schematic diagram that the present invention exports the pulse signal that brightness dutycycle is 90%；
Fig. 4 b is the schematic diagram that the present invention exports the pulse signal that brightness dutycycle is 50%.
Detailed description of the invention
Below in conjunction with accompanying drawing, the technical scheme of the application is described in detail.
The method controlling display lamp brightness of the application, comprise the following steps: first, based on the ratio between present intensity controlling value and the high-high brightness controlling value of display lamp, it is thus achieved that output brightness dutycycle, then, cycle frequency based on described output brightness dutycycle and output brightness dutycycle, by cycle rate counter and intervalometer, it is thus achieved that pulse signal, finally, described pulse signal is utilized to control the switch of display lamp, to realize the control to display lamp brightness.
Pulse signal is generated by cycle rate counter and intervalometer, recycle this pulse signal and control the switch of display lamp, thus, it is achieved that the control to display lamp brightness, it is to avoid be absent from PWM port in electronic equipment or PWM port is occupied and situation about cannot display lamp brightness be controlled.
In this application, as it is shown in figure 1, the method controlling display lamp brightness, being applied in the electronic equipment comprising a display lamp, described electronic equipment can be TV, computer etc., and it is not construed as limiting by the application.Described method includes:
Step 101: based on the ratio between present intensity controlling value and the high-high brightness controlling value of display lamp, it is thus achieved that output brightness dutycycle.
In specific implementation process, high-high brightness controlling value is the high-high brightness rank that the display lamp prestored can export, such as, high-high brightness controlling value is 10, then show that the high-high brightness rank that display lamp exports is 10, certainly, the maximum brightness value of setting can also do any selection in 10-100, and the selection of display lamp high-high brightness controlling value is not construed as limiting by the application.After high-high brightness controlling value is determined, can in the scope less than high-high brightness controlling value, user can select present intensity controlling value, present intensity controlling value is the gray scale that the current desired adjustment of display lamp is arrived, concrete, electronic equipment receives the control operation of user, such as, by the control operation that display lamp brightness is controlled by IR signal reception user, it is obtained in that user needs the rank adjusted by display lamp according to controlling operation, i.e. present intensity controlling value, such as, the gray scale of display lamp needs to adjust to 5, then present intensity controlling value is adjusted to 5.Under the premise that high-high brightness controlling value is constant, present intensity controlling value is more big, the brighter display of display lamp, otherwise, present intensity controlling value is more little, and the brightness of display lamp is more dark.According to the ratio between present intensity controlling value and high-high brightness controlling value, it is obtained in that output brightness dutycycle, such as, when high-high brightness controlling value is 10, if present intensity controlling value is 5, then output brightness dutycycle is 50%, if present intensity controlling value is 9, then output brightness dutycycle is 90%, if present intensity controlling value is 1, then output brightness dutycycle is 10%.
After completing step 101, the application performs step 102: based on the cycle frequency of described output brightness dutycycle and output brightness dutycycle, by cycle rate counter and intervalometer, it is thus achieved that pulse signal.
In specific implementation process, owing to passage of scintillation light is had visual persistence effect by human eye, usual cycle frequency is when more than 100Hz, and the light of flicker is absent from flickering by human eye, it is believed that it is continuous print, electronic equipment can light display lamp generally in the standby state again, and due under holding state the work of central processing unit be restricted, therefore, for avoiding increasing the weight of the process task amount of central processing unit, preferably, the cycle frequency of brightness dutycycle is exported less than or equal to 1000Hz.After obtaining the cycle frequency of output brightness dutycycle and output brightness dutycycle, by cycle rate counter counting while intervalometer timing, it is thus achieved that pulse signal.Wherein, cycle rate counter associates with intervalometer.
Concrete, in the first implementation of the application, step 102 includes:
Step 201: based on described output brightness dutycycle, it is determined that the initial count value of described cycle rate counter and threshold value；
Step 202: based on described initial count value and described cycle frequency, it is determined that the base during timing of described intervalometer；
Step 203: the base work when intervalometer is with described timing, and when cycle rate counter counts with initial count value, whether the count value of cycle criterion cycle rate counter is more than described threshold value；
Step 204: when described count value is more than threshold value, export the first level signal, wherein, when described count value is less than or equal to threshold value, exports the second electrical level signal contrary with the first level signal.
In specific implementation process, when the cycle frequency exporting brightness dutycycle is 1000Hz, if output brightness dutycycle is 90%, it may be determined that the initial count value of cycle rate counter is 10, and the threshold value of cycle rate counter is 9；If output brightness dutycycle is 50%, it may be determined that the initial count value of cycle rate counter is 10, and the threshold value of cycle rate counter is 5, alternatively, it is also possible to determine that the initial count value of cycle rate counter is 8, the threshold value of cycle rate counter is 4.Then, the inverse according to initial count value and described cycle frequency product, obtain base during the timing of runs, i.e. Tb=1/ (f × N), wherein, TbBase during for timing, f is the cycle frequency of output brightness dutycycle, and N is initial count value.
And, the operation principle of cycle rate counter is as shown in Figure 2, it is preferred that, in step 203, whether the count value of cycle criterion cycle rate counter is more than described threshold value, including:
Step 2031: whether the count value judging cycle rate counter is zero, if so, then performs step 2032, if it is not, then perform step 2033；
Step 2032: give cycle rate counter by initial count value, then, performs step 2034；
Step 2033: count value subtracts one, then, performs step 2034；
Step 2034: judge that whether count value is more than threshold value.
Wherein, in this application, after step 2034, when count value is more than threshold value, perform step 2041, when count value is less than or equal to threshold value, perform step 2042:
Step 2041: export the first level signal；
Step 2042: output second electrical level signal.
Wherein, by the count value of cycle rate counter being circulated judgement, and corresponding outputs level signals, it is possible to obtain pulse signal.First level signal and second electrical level signal are contrary signal, and when the first level signal is set to high level, second electrical level signal is low level, and when the first level signal is set to low level, second electrical level signal is high level.In specific implementation process, by said method, within a cycle, it is possible to obtain correspondence output brightness dutycycle be 90% pulse signal as shown in Figure 3 a, wherein, in Fig. 3 a, f is 1000Hz, N is 10, TbIt is 100 μ s；Obtaining shown in pulse signal such as Fig. 3 b and Fig. 3 c that correspondence output brightness dutycycle is 50%, wherein, in Fig. 3 b, f is 1000Hz, N is 10, TbBe that in 100 μ s, Fig. 3 c, f is 1000Hz, N it is 8, TbIt is 125 μ s.And when circulation time is more than a cycle, it is possible to obtain pulse signal that correspondence output brightness dutycycle is 90% as shown in fig. 4 a, it is thus achieved that corresponding output brightness dutycycle be 50% pulse signal as shown in Figure 4 b.
Preferably, in the second embodiment of the application, step 102 includes:
Step 301: give described cycle rate counter using described maximum brightness value controlling value as initial count value, meanwhile, give cycle rate counter using described present intensity controlling value as threshold value；
Step 302: based on described initial count value and described cycle frequency, it is determined that the base during timing of described intervalometer；
Step 303: the base work when intervalometer is with described timing, and when cycle rate counter counts with initial count value, whether the count value of cycle criterion cycle rate counter is more than described threshold value；
Step 304: when described count value is more than threshold value, export three level signal, wherein, when described count value is less than or equal to threshold value, exports fourth level signal contrary with three level signal.
In specific implementation process, owing to output brightness dutycycle calculates according to present intensity controlling value and high-high brightness controlling value, natural, directly utilize present intensity controlling value and high-high brightness controlling value just can realize output brightness dutycycle, therefore, can using the high-high brightness controlling value initial count value as cycle rate counter, using the present intensity controlling value threshold value as cycle rate counter, such as, when high-high brightness controlling value 10, using 10 as initial count value, during present intensity controlling value 5, using 5 as threshold value.And step 302, step 303 are identical with the operation principle of step 202, step 203 and step 204 in the first implementation with the operation principle of step 304.In like manner, in step 304, three level signal and the 4th level signal are high level or low level, and three level signal and the 4th level signal are contrary signal.
In this application, utilize present intensity controlling value and high-high brightness controlling value to realize output brightness dutycycle so that output brightness dutycycle to realize process simple, it is not necessary to by complicated calculating process, decrease the task amount that central processing unit processes.
Preferably, in this application, it is thus achieved that after pulse signal, comprise the following steps:
Determine described cycle frequency；
Judge that whether cycle frequency is less than the first cycle frequency.
In specific implementation process, if cycle frequency is too small, then eye-observation to display lamp brightness can there is flickering, therefore, set the first cycle frequency, be generally 100Hz, additionally, first cycle frequency can also more than 100Hz, and the first cycle frequency can be set by those skilled in the art according to specific embodiment, and the application is not construed as limiting.For meeting human eye not flickering, when cycle frequency is less than the first cycle frequency, step 102 comprises the following steps:
Based on described output brightness dutycycle, determined the counting sequence of cycle rate counter by interval mode；
Based on described counting sequence and described cycle frequency, it is determined that the base during timing of described intervalometer；
When intervalometer is with described timing during base work, including the pulse signal of the 5th level signal and the 6th level signal with the output of described counting sequence, wherein, described 5th level signal and described 6th level signal are contrary level signal.
In specific implementation process, output brightness dutycycle is realized with interval mode, such as, when output brightness dutycycle is 90%, determine that counting sequence can be { 1 by interval mode, 1, 1, 1, 0, 1, 1, 1, 1, 1}, when output brightness dutycycle is 50%, determine that counting sequence can be { 0 by interval mode, 1, 0, 1, 0, 1, 0, 1, 0, 1}, utilize counting sequence can export the pulse signal comprising varying level signal, in like manner, 5th level signal and the 6th level signal are high level or low level, and the 5th level signal and the 6th level signal be contrary signal.
nullIt should be noted that，In this application，Can corresponding different gray scale in advance，Set up brightness output two-dimensional array [X] [X],Such as，Set up brightness output two-dimensional array [10] [10] comprising 10 gray scales,The corresponding counting sequence { 0 of gray scale 0，0，0，0，0，0，0，0，0，0}，The corresponding counting sequence { 0 of gray scale 1,0,0,0,1,0,0,0,0,0}，The corresponding counting sequence { 0 of gray scale 2,1,0,0,1,0,0,1,0,0}，The corresponding counting sequence { 0 of gray scale 3,1,0,0,1,0,0,1,0,0,}，The corresponding counting sequence { 0 of gray scale 4,1,0,1,0,1,0,0,1,0}，The corresponding counting sequence { 0 of gray scale 5,1,0,1,0,1,0,1,0,1}，The corresponding counting sequence { 0 of gray scale 6,1,1,1,0,1,0,1,0,1}，The corresponding counting sequence { 0 of gray scale 7,1,1,1,0,1,1,1,0,1}，The corresponding counting sequence { 1 of gray scale 8,1,1,1,0,1,1,1,0,1}，The corresponding counting sequence { 1 of gray scale 9,1,1,1,0,1,1,1,1,1}.Under different gray scales, cycle rate counter selects different counting sequences, and carrys out output pulse signal with corresponding counting sequence.Wherein, present intensity controlling value is selected gray scale, and e.g., when present intensity controlling value is 5, corresponding brightness rank is 5.
Also, it should be noted cycle frequency should be not too low yet, for instance, less than 1Hz.
After completing step 102, the application performs step 103: utilize described pulse signal to control the switch of display lamp, to realize the control to display lamp brightness.
In specific implementation process, the pulse signal obtained is added to the port controlling indicator light switch, by the high and low level signal comprised in pulse signal, control the Push And Release of display lamp, it is preferred that, it is possible to high level signal is set and opens for controlling display lamp, low level signal closes for controlling display lamp, finally, under the pulse signal control to indicator light switch, it is achieved that the control to display lamp brightness.
Claims (2)
1. the method controlling display lamp brightness, it is characterised in that comprise the following steps:
Based on the ratio between present intensity controlling value and the high-high brightness controlling value of display lamp, it is thus achieved that output brightness dutycycle；
Determine cycle frequency；
Judge that whether cycle frequency is less than the first cycle frequency；
When cycle frequency is not less than the first cycle frequency: based on described output brightness dutycycle, it is determined that the initial count value of cycle rate counter and threshold value；Based on described initial count value and described cycle frequency, it is determined that the base during timing of intervalometer；The base work when intervalometer is with described timing, and when cycle rate counter counts with initial count value, whether the count value of cycle criterion cycle rate counter is more than described threshold value；When described count value is more than threshold value, export the first level signal；When described count value is less than or equal to threshold value, exporting second electrical level signal, wherein, described first level signal and described second electrical level signal are the opposite levels signal of pulse signal；
When cycle frequency is less than the first cycle frequency: based on described output brightness dutycycle, determined the counting sequence of cycle rate counter by interval mode；Based on described counting sequence and described cycle frequency, it is determined that the base during timing of intervalometer；When intervalometer is with described timing during base work, include the pulse signal of the 5th level signal and the 6th level signal with the output of described counting sequence；Wherein, described 5th level signal and described 6th level signal are contrary level signal；
Described pulse signal is utilized to control the switch of display lamp, to realize the control to display lamp brightness.
2. the method controlling display lamp brightness as claimed in claim 1, it is characterised in that described first cycle frequency is be more than or equal to 100Hz.
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