CN104424913A - Backlight brightness adjusting circuit, backlight brightness adjusting method and computer - Google Patents
Backlight brightness adjusting circuit, backlight brightness adjusting method and computer Download PDFInfo
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Abstract
The invention, which belongs to the technical field of displaying, especially relates to a backlight brightness adjusting circuit, a backlight brightness adjusting method and a computer. The backlight brightness adjusting circuit is composed of a main controller, a video decoder, and an EC chip. The main controller outputs video data to the video decoder; the video decoder outputs display data to a display drive module according to the video data; and a backlight control signal is outputted to the display drive module by the EC chip. When a user adjusts the backlight brightness by a keyboard, the EC chip adjusts the backlight control signal according to an adjusting signal. According to the backlight brightness adjusting circuit, the backlight control signal outputted by the video decoder is outputted to the EC chip instead of the display drive module. Under the circumstances that no computer component is increased, the conflict between the EC chip and the CPU of the Feiteng series at the backlight control can be avoided, so that the computer with the CPU of the Feiteng series has the function of backlight brightness adjustment of the liquid crystal display screen by the keyboard.
Description
Technical field
The invention belongs to display technique field, particularly a kind of backlight illumination regulating circuit, back light brightness regulating method and computing machine.
Background technology
At present, some computing machines are provided with LCD screen backlight brightness regulation hot key on keyboard, generally appear on the built-in keybad of notebook computer, and be also provided with relevant hot key on the keyboard of some desk-top computers.These computing machines adopt EC(Embed Controller, embedded controller) chip carrys out monitor user ' actuation of keys, simultaneously also by the backlight illumination of EC chip according to the key assignments adjustable liquid crystal display display screen of input.
But, some adopt the Presentation Function of the computing machine of the serial CPU that soars to be send to Video Decoder by the image processing module of this CPU, LVDS(Low Voltage DifferentialSignaling is produced, Low Voltage Differential Signal by Video Decoder) signal and brightness control signal output to LCDs.Do not arrange corresponding interface due to the serial CPU that soars and EC chip carries out data transmission, when the brilliance control of user to LCDs, image processing module and the EC chip of the serial CPU that soars will produce control signal and conflict.Therefore, when designing the computing machine adopting the serial CPU that soars, the brightness of keyboard adjustable liquid crystal display display backlight cannot be adopted.
In sum, existing employing soar serial CPU computing machine exist cannot by the problem of the backlight illumination of keyboard adjustable liquid crystal display display screen.
Summary of the invention
The object of the present invention is to provide a kind of backlight illumination regulating circuit, be intended to solve existing employing soar that the computing machine of serial CPU exists cannot by the problem of the backlight illumination of keyboard adjustable liquid crystal display display screen.
The present invention is achieved in that a kind of backlight illumination regulating circuit, is connected with driver module and keyboard, and described driver module regulates the backlight illumination of connected LCDs according to received backlight control signal; Described backlight illumination regulating circuit comprises master controller, and described backlight illumination regulating circuit also comprises:
Video Decoder, input end connects the output terminal of described master controller, display data output end connects the display data input pin of described driver module, and there is backlight signal output terminal, for the video data that exports according to described master controller by described display data output end output display data, and export the first backlight control signal by described backlight signal output terminal;
EC chip, backlight signal input end connects the backlight signal output terminal of described Video Decoder, control end connects the output terminal of described keyboard, backlight signal output terminal connects the backlight signal input end of described driver module, for described first backlight control signal is forwarded to described driver module, or the conditioning signal exported according to described keyboard and described first backlight control signal generate and export the second backlight control signal to described driver module.
Another object of the present invention is to provide a kind of back light brightness regulating method based on above-mentioned backlight illumination regulating circuit, the method comprises the following steps:
A. the video data that exports according to described master controller of described Video Decoder, to described driver module output display data, and exports the first backlight control signal to described EC chip;
B. described first backlight control signal is forwarded to described driver module by described EC chip;
C. described EC chip receives the conditioning signal that described keyboard exports;
D. described EC chip to regulate described first backlight control signal according to described conditioning signal and generates the second backlight control signal;
E. described second backlight control signal exports described to driver module by described EC chip.
Another order of the present invention is to provide a kind of computing machine, comprises mainboard, LCDs, keyboard and housing, and described computing machine also comprises above-mentioned backlight illumination regulating circuit.
The present invention comprises the backlight illumination regulating circuit of master controller, Video Decoder and EC chip by adopting, by master controller output video data to Video Decoder, by Video Decoder according to video data to driver module output display data, export the first backlight control signal to EC chip, EC chip exports the first backlight control signal received to driver module simultaneously; When user by keyboard to EC chip output regulation signal with adjusting backlight luminance time, EC chip regulates the first backlight control signal according to conditioning signal, and by generate the second backlight control signal export driver module to.Whole backlight illumination regulating circuit exports the backlight control signal that Video Decoder exports to EC chip and does not export driver module to, when not increasing computing machine components and parts, avoid EC chip and soar serial CPU conflicting in backlight control, make to adopt the soar computing machine of serial CPU to possess the function of the backlight illumination by keyboard adjustable liquid crystal display display screen.
Accompanying drawing explanation
Fig. 1 is the function structure chart of the backlight illumination regulating circuit that the embodiment of the present invention provides;
Fig. 2 is the flowage structure figure of the back light brightness regulating method that the embodiment of the present invention provides;
Fig. 3 is the flowage structure figure of the back light brightness regulating method that another embodiment of the present invention provides;
Fig. 4 is the flowage structure figure of the back light brightness regulating method that another embodiment of the present invention provides;
Fig. 5 is the flowage structure figure of the back light brightness regulating method that another embodiment of the present invention provides;
Fig. 6 is the flowage structure figure of the back light brightness regulating method that another embodiment of the present invention provides.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The embodiment of the present invention comprises the backlight illumination regulating circuit of master controller, Video Decoder and EC chip by adopting, export the backlight control signal that Video Decoder exports to EC chip and do not export driver module to, avoid EC chip and soar serial CPU conflicting in backlight control, make to adopt the soar computing machine of serial CPU to possess the function of the backlight illumination by keyboard adjustable liquid crystal display display screen.
Fig. 1 shows the modular structure of the backlight illumination regulating circuit that the embodiment of the present invention provides, and for convenience of explanation, illustrate only and embodiment of the present invention relevant portion, details are as follows:
The backlight illumination regulating circuit that the embodiment of the present invention provides is connected with driver module 500 and keyboard 400, and driver module 500 regulates the backlight illumination of connected LCDs according to received backlight control signal; Backlight illumination regulating circuit comprises master controller 100, and backlight illumination regulating circuit also comprises:
Video Decoder 200, input end connects the output terminal of master controller 100, display data output end connects the display data input pin of driver module 500, and there is backlight signal output terminal, video data for exporting according to master controller 100 passes through display data output end output display data, and exports the first backlight control signal by backlight signal output terminal.
EC chip 300, backlight signal input end connects the backlight signal output terminal of Video Decoder 200, control end connects the output terminal of keyboard 400, backlight signal output terminal connects the backlight signal input end of driver module 500, for the first backlight control signal is forwarded to driver module 500, or according to keyboard 400 export conditioning signal and the first backlight control signal generate and export the second backlight control signal to driver module 500.
In embodiments of the present invention, master controller 100 can be the serial CPU that soars; The backlight illumination regulating circuit provided of the embodiment of the present invention is applicable to the serial CPU that soars, but is not limited thereto.The CPU of other kinds can adopt this circuit to carry out backlight illumination adjustment equally, and this circuit has good compatibility.
In embodiments of the present invention, Video Decoder 200 can be the video decoding chip of CHRONTEL series, and concrete model can be CH7034, but is not limited thereto.
In embodiments of the present invention, EC chip 300 can also comprise before the first backlight control signal is forwarded to driver module 500:
EC chip 300 receives and judges that whether the first backlight control signal is effective, in this way, then the first backlight control signal is forwarded to driver module 500, as no, then again receive and judge that whether the first backlight control signal is effective.
In embodiments of the present invention, because EC chip 300 controls the power supply supply of multiple circuit module in computing machine simultaneously, if the backlight control signal of mistake, as level is abnormal, enters EC chip 300, other circuit modules in computing machine may be damaged.Therefore, it is necessary for detecting this backlight control signal, enhances the security of computing machine.
In embodiments of the present invention, the first backlight control signal and the second backlight control signal can be all pulse width modulating signal, adopt pulse width modulating signal as backlight illumination control signal, have easy to adjust, control stable advantage.
In embodiments of the present invention, the conditioning signal that exports according to keyboard of EC chip 300 and the first backlight control signal generate the second backlight control signal and are specifically as follows:
EC chip 300 judges whether the dutycycle of increase first backlight control signal according to conditioning signal, in this way, then the dutycycle of the first backlight control signal is increased according to presetting regulated quantity and generates the second backlight control signal, as no, then the dutycycle of the first backlight control signal reduced according to presetting regulated quantity and generates the second backlight control signal.
In embodiments of the present invention, user can pre-set one and preset regulated quantity, as 5%, 10%, 15% or 20%, but is not limited thereto; EC chip 300, after receiving conditioning signal, according to this conditioning signal and this default regulated quantity, the basis of the first backlight control signal can increase or reduces one and preset regulated quantity.Further, the scope due to dutycycle is 0% to 100%, and correspondingly, EC chip 300 also can not exceed this scope to the adjustment of the dutycycle of the first backlight control signal.
In another embodiment of the invention, the conditioning signal that exports according to keyboard 400 of EC chip 300 and the first backlight control signal generate the second backlight control signal and are specifically as follows:
The dutycycle of the first backlight control signal is set to reference duty cycle by EC chip 300, according to reference duty cycle and duty cycle range, multiple intensity level is set, and the dutycycle of increase first backlight control signal is judged whether according to conditioning signal, in this way, then the first backlight control signal raised an intensity level and generate the second backlight control signal, as no, then the first backlight control signal lowered an intensity level and generate the second backlight control signal.
In another embodiment of the invention, EC chip 300 can arrange 10 intensity levels according to the first backlight control signal, and the dutycycle of the first backlight control signal is set to reference duty cycle, and the gray scale corresponding to it can be 5 grades.EC chip 300 can arrange interval between adjacent brightness level according to the scope of dutycycle and this reference duty cycle; Such as, reference duty cycle is 50%, and the interval between its adjacent brightness level can be 10%.
The embodiment of the present invention comprises the backlight illumination regulating circuit of master controller 100, Video Decoder 200 and EC chip 300 by adopting, by master controller 100 output video data to Video Decoder 200, by Video Decoder 200 according to video data to driver module 500 output display data, export the first backlight control signal to EC chip 300, EC chip 300 exports the first backlight control signal received to driver module 500 simultaneously; When user by keyboard 400 to EC chip 300 output regulation signal with adjusting backlight luminance time, EC chip 300 regulates the first backlight control signal according to conditioning signal, and by generate the second backlight control signal export driver module 500 to.Whole backlight illumination regulating circuit exports the backlight control signal that Video Decoder 200 exports to EC chip 300 and does not export driver module 500 to, when not increasing computing machine components and parts, avoid EC chip 300 and soar serial CPU conflicting in backlight control, make to adopt the soar computing machine of serial CPU to possess the function of the backlight illumination by keyboard 400 adjustable liquid crystal display display screen.
Another object of the embodiment of the present invention is to provide a kind of back light brightness regulating method based on above-mentioned backlight illumination regulating circuit.
Fig. 2 shows the flowage structure of the back light brightness regulating method that the embodiment of the present invention provides, and for convenience of explanation, illustrate only and embodiment of the present invention relevant portion, details are as follows:
The method comprises the following steps:
S10. the video data that exports according to master controller 100 of Video Decoder 200, to driver module 500 output display data, and exports the first backlight control signal to EC chip 300.
First backlight control signal is forwarded to driver module 500 by S20.EC chip 300.
S30.EC chip 300 receives the conditioning signal that keyboard 400 exports.
S40.EC chip 300 to regulate the first backlight control signal according to conditioning signal and generates the second backlight control signal.
S50.EC chip 300 exports the second backlight control signal to driver module 500.
In embodiments of the present invention, export the backlight control signal that Video Decoder 200 exports to EC chip 300 and do not export driver module 500 to, avoiding EC chip 300 and soar serial CPU conflicting in backlight control.
In embodiments of the present invention, as shown in Figure 3, step S20 is specifically as follows:
S201. described EC chip receives described first backlight control signal.
S202. described EC chip judges that whether described first backlight control signal is effective, in this way, then performs step S203, as no, then performs step S201.
S203. described EC chip exports described first backlight control signal to described driver module.
In embodiments of the present invention, because EC chip 300 controls the power supply supply of multiple circuit module in computing machine simultaneously, if the backlight control signal of mistake, as level is abnormal, enters EC chip 300, other circuit modules in computing machine may be damaged.Therefore, it is necessary for detecting this backlight control signal, enhances the security of computing machine.
In embodiments of the present invention, can also comprise between step S20 and step S30:
S21.EC chip 300 has judged whether that conditioning signal inputs, and in this way, then performs step S30, as no, then performs step S21.
In embodiments of the present invention, EC chip 300 just starts keyboard scan 400 and exports after powering on, and when user presses the button of adjusting backlight luminance, EC chip 300 judges that this key assignments is conditioning signal simultaneously.
In another embodiment of the invention, as shown in Figure 4, can also comprise before step S10:
S01. user powers on for EC chip 300.
S02.EC chip 300 initialization GPIO(General Purpose Input Output, universal input/output interface) and standby.
S03.EC chip 300 has judged whether that power-on command inputs, and in this way, then performs step S04, as no, then performs step S03.
S04.EC chip 300 powers on for master controller 100, Video Decoder 200 and driver module 500.
In embodiments of the present invention, because EC chip 300 natively has the function of Energy control, therefore, there is when computer booting this step, and these steps are also the guarantees that the embodiment of the present invention can realize simultaneously.
In an alternative embodiment of the invention, as shown in Figure 5, step S40 is specifically as follows:
S401a.EC chip 300 judges whether the dutycycle of increase first backlight control signal according to conditioning signal, in this way, then performs step S402a, as no, then performs step S403a.
The dutycycle of the first backlight control signal to increase according to default regulated quantity and generates the second backlight control signal by S402a.EC chip 300.
The dutycycle of the first backlight control signal to reduce according to default regulated quantity and generates the second backlight control signal by S403a.EC chip 300.
In embodiments of the present invention, user can pre-set one and preset regulated quantity, as 5%, 10%, 15% or 20%, but is not limited thereto; Scope due to dutycycle is 0% to 100%, and correspondingly, EC chip 300 also can not exceed this scope to the adjustment of the dutycycle of the first backlight control signal.
In another embodiment of the invention, as shown in Figure 6, step S40 is specifically as follows:
The dutycycle of the first backlight control signal is set to reference duty cycle by S401b.EC chip 300.
S402b.EC chip 300 arranges multiple intensity level according to reference duty cycle and duty cycle range.
S403b.EC chip 300 judges whether the dutycycle of increase first backlight control signal according to conditioning signal, in this way, then performs step S404b, as no, then performs step S405b.
First backlight control signal is raised an intensity level and generates the second backlight control signal by S404b.EC chip 300.
First backlight control signal is lowered an intensity level and is generated the second backlight control signal by S405b.EC chip 300.
In embodiments of the present invention, EC chip 300 can arrange 10 intensity levels according to the first backlight control signal, and the dutycycle of the first backlight control signal is set to reference duty cycle, and the gray scale corresponding to it can be 5 grades.EC chip 300 can arrange interval between adjacent brightness level according to the scope of dutycycle and this reference duty cycle; Such as, reference duty cycle is 50%, and the interval between its adjacent brightness level can be 10%.
Another order of the embodiment of the present invention is to provide a kind of computing machine, comprise mainboard, LCDs, keyboard and housing, described computing machine also comprises above-mentioned backlight illumination regulating circuit, and adopts above-mentioned back light brightness regulating method to regulate the backlight illumination of described LCDs.
In embodiments of the present invention, this computing machine can be desk-top computer or notebook computer.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a backlight illumination regulating circuit, is connected with driver module and keyboard, and described driver module regulates the backlight illumination of connected LCDs according to received backlight control signal; Described backlight illumination regulating circuit comprises master controller, it is characterized in that, described backlight illumination regulating circuit also comprises:
Video Decoder, input end connects the output terminal of described master controller, display data output end connects the display data input pin of described driver module, and there is backlight signal output terminal, for the video data that exports according to described master controller by described display data output end output display data, and export the first backlight control signal by described backlight signal output terminal;
EC chip, backlight signal input end connects the backlight signal output terminal of described Video Decoder, control end connects the output terminal of described keyboard, backlight signal output terminal connects the backlight signal input end of described driver module, for described first backlight control signal is forwarded to described driver module, or the conditioning signal exported according to described keyboard and described first backlight control signal generate and export the second backlight control signal to described driver module.
2. backlight illumination regulating circuit as claimed in claim 1, it is characterized in that, described first backlight control signal and described second backlight control signal are pulse width modulating signal.
3. backlight illumination regulating circuit as claimed in claim 2, it is characterized in that, described EC chip was also used for before described first backlight control signal is forwarded to described driver module:
Receive and judge that whether described first backlight control signal is effective, in this way, then described first backlight control signal being forwarded to described driver module, as no, then again receive and judge that whether described first backlight control signal is effective.
4. backlight illumination regulating circuit as claimed in claim 2, is characterized in that, the process that the conditioning signal that described EC chip exports according to described keyboard and described first backlight control signal generate described second backlight control signal is specially:
Described EC chip judges whether according to described conditioning signal the dutycycle increasing described first backlight control signal, in this way, then the dutycycle of described first backlight control signal is increased according to presetting regulated quantity and generates described second backlight control signal, as no, then the dutycycle of described first backlight control signal reduced according to presetting regulated quantity and generates described second backlight control signal.
5. backlight illumination regulating circuit as claimed in claim 2, is characterized in that, the process that the conditioning signal that described EC chip exports according to described keyboard and described first backlight control signal generate described second backlight control signal is specially:
The dutycycle of described first backlight control signal is set to reference duty cycle by described EC chip, according to described reference duty cycle and duty cycle range, multiple intensity level is set, and judge whether according to described conditioning signal the dutycycle increasing described first backlight control signal, in this way, then described first backlight control signal raised an intensity level and generate described second backlight control signal, as no, then described first backlight control signal lowered an intensity level and generate described second backlight control signal.
6. based on a back light brightness regulating method for backlight illumination regulating circuit according to claim 1, it is characterized in that, described back light brightness regulating method comprises the following steps:
A. the video data that exports according to described master controller of described Video Decoder, to described driver module output display data, and exports the first backlight control signal to described EC chip;
B. described first backlight control signal is forwarded to described driver module by described EC chip;
C. described EC chip receives the conditioning signal that described keyboard exports;
D. described EC chip to regulate described first backlight control signal according to described conditioning signal and generates the second backlight control signal;
E. described second backlight control signal exports described to driver module by described EC chip.
7. back light brightness regulating method as claimed in claim 6, it is characterized in that, described first backlight control signal and described second backlight control signal are pulse width modulating signal.
8. back light brightness regulating method as claimed in claim 7, it is characterized in that, described step D is specifically as follows:
D1a. described EC chip judges whether according to described conditioning signal the dutycycle increasing described first backlight control signal, in this way, then performs step D2a, as no, then performs step D3a;
D2a. the dutycycle of described first backlight control signal to increase according to default regulated quantity and generates described second backlight control signal by described EC chip;
D3a. the dutycycle of described first backlight control signal to reduce according to default regulated quantity and generates described second backlight control signal by described EC chip.
9. back light brightness regulating method as claimed in claim 7, it is characterized in that, described step D is specifically as follows:
D1b. the dutycycle of described first backlight control signal is set to reference duty cycle by described EC chip;
D2b. described EC chip arranges multiple intensity level according to described reference duty cycle and duty cycle range;
D3b. described EC chip judges whether according to described conditioning signal the dutycycle increasing described first backlight control signal, in this way, then performs step D4b, as no, then performs step D5b;
D4b. described first backlight control signal is raised an intensity level and generates described second backlight control signal by described EC chip;
D5b. described first backlight control signal is lowered an intensity level and is generated described second backlight control signal by described EC chip.
10. a computing machine, comprises mainboard, LCDs, keyboard and housing, it is characterized in that, described computing machine comprises the backlight illumination regulating circuit as described in any one of claim 1 to 5.
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| CN201310376320.2A CN104424913B (en) | 2013-08-26 | 2013-08-26 | A kind of backlight illumination adjusts circuit, back light brightness regulating method and computer |
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| CN107799091A (en) * | 2017-11-14 | 2018-03-13 | 山东超越数控电子股份有限公司 | A kind of screen luminance adjustment method and system |
| CN108986729A (en) * | 2018-06-28 | 2018-12-11 | 山东超越数控电子股份有限公司 | The control method and system of notebook LVDS screen intensity are adjusted based on EC |
| CN115394267A (en) * | 2022-09-23 | 2022-11-25 | 北京显芯科技有限公司 | Display system |
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