CN104007949A - Liquid crystal display control system and method - Google Patents
Liquid crystal display control system and method Download PDFInfo
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- CN104007949A CN104007949A CN201410252918.5A CN201410252918A CN104007949A CN 104007949 A CN104007949 A CN 104007949A CN 201410252918 A CN201410252918 A CN 201410252918A CN 104007949 A CN104007949 A CN 104007949A
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- 235000019800 disodium phosphate Nutrition 0.000 abstract 1
- 238000004364 calculation method Methods 0.000 description 3
- 238000004590 computer program Methods 0.000 description 3
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Abstract
The invention provides a liquid crystal display control system and method and relates to the computer technical field. The problem that the LCD (Liquid Crystal Display) screen control scheme is supported by no YHFT DSP (Digital Signal Processor) is solved. The liquid crystal display control system comprises a processor, an embedded control chip and a liquid crystal display; the processor is connected onto the embedded control chip through a first bus; the embedded control chip is connected onto the liquid crystal display through a second bus; a PWM (Pulse Width Modulation) brightness control signal and or a screen backlight enable signal are or is sent to the liquid crystal display through the second bus. The liquid crystal display control system and method is suitable for YHFT DSP platforms and the control on LCD screens of YHFT DSPs is achieved.
Description
Technical field
The present invention relates to field of computer technology, relate in particular to a kind of liquid crystal display control system and method.
Background technology
Adopting domestic processor, operating system is national information security strategy, and the portable computer of traditional x86 platform is all generally to adopt Intel or AMD framework, lcd screen control has the application scheme of a set of maturation, adopt the controller of external EC vendor specific to realize, its shortcoming is that hardware circuit complexity, software code amount are large.But the domestic processor of soaring (as YHFT-DSP processor) need to support lcd screen control also there is no a set of successful scheme.
Summary of the invention
The invention provides a kind of liquid crystal display control system and method, solved the problem that does not have YHFT-DSP processor to support lcd screen control program.
A kind of liquid crystal display control system, comprising:
Processor, embedded control chip and liquid crystal display;
Described processor and be connected to described embedded control chip by the first bus;
Described embedded control chip is connected to described liquid crystal display by the second bus, sends PWM brightness control signal and/or screen backlight enable signal by described the second bus to described liquid crystal display.
Preferably, described processor is YHFT-DSP processor.
Preferably, this system also comprises power supply soft starting circuit, and this power supply soft starting circuit is connected with power supply;
Described power supply soft starting circuit is connected with described embedded control chip, receives the power supply enable signal that described embedded chip sends;
Described power supply soft starting circuit is connected with described liquid crystal display, is described LCD device electric supply.
Preferably, this system also comprises Hall element;
Described Hall element is connected to described embedded control chip.
Preferably, described the first bus and the second bus are SMBUS bus.
The present invention also provides a kind of liquid crystal display control method, comprising:
Embedded control chip collecting ring environment information;
Described embedded control chip, according to described environmental information, sends corresponding control signal to liquid crystal display and shows control.
Preferably, described environmental information is: the exporting change information of system boot information or the Hall element that is connected with described embedded control chip, described embedded control chip, according to described environmental information, sends corresponding control signal to liquid crystal display and shows that control is specially:
Described embedded control chip is opened the PWM brightness control signal in the second bus, to regulate the peak pulse duration of described liquid crystal display device backlight lightness;
After opening described PWM brightness control signal, described embedded control chip sends screen backlight enable signal to described liquid crystal display, by the backlight lightening of described liquid crystal display.
Preferably, described environmental information is the brightness regulation instruction that processor sends to described embedded control chip, and described embedded control chip, according to described environmental information, sends corresponding control signal to liquid crystal display and shows that control comprises:
Described embedded control chip sends PWM brightness control signal to described liquid crystal display, indicates described liquid crystal display to regulate brightness.
Preferably, described environmental information is: the variation of the output of system closedown or the Hall element that is connected with described embedded control chip, described embedded control chip, according to described environmental information, sends corresponding control signal to liquid crystal display and shows that control is specially:
Described embedded control chip is closed screen backlight enable signal, PWM brightness control signal and power supply enable signal successively.
Preferably, the method also comprises:
Described embedded control chip is communicated by letter with described liquid crystal display by the second bus, obtains the information of this liquid crystal display, and described information is stored in the internal register of this embedded control chip;
Described processor reads described information by described the first bus from the internal register of described embedded control chip.
The invention provides a kind of liquid crystal display control system and method, this system comprises processor, embedded control chip and liquid crystal display, described processor and be connected to described embedded control chip by first bus, described embedded control chip is connected to described liquid crystal display by the second bus, sends PWM brightness control signal and/or screen backlight enable signal by described the second bus to described liquid crystal display.Embedded control chip collecting ring environment information, according to described environmental information, send corresponding control signal to liquid crystal display and show control, realized the control of YHFT-DSP processor to lcd screen, solved the problem that does not have YHFT-DSP processor to support lcd screen control program.
Brief description of the drawings
Fig. 1 is the structural representation of a kind of liquid crystal display control system of providing of embodiments of the invention one.
Embodiment
Adopt the controller of external EC vendor specific to realize, its shortcoming is that hardware circuit complexity, software code amount are large.But domestic YHFT-DSP processor (as YHFT-DSP processor) need to support lcd screen control also there is no a set of successful scheme.
In order to address the above problem, embodiments of the invention provide a kind of liquid crystal display control system and method, between embedded control chip and LCD, set up hardware control circuit, and have formulated perfect screen management strategy, realize the operation to screen.The technical scheme that embodiments of the invention provide has that operating strategy is self-defined, hardware circuit is simple, little feature is measured in software code exploitation.
Hereinafter in connection with accompanying drawing, embodiments of the invention are elaborated.It should be noted that, in the situation that not conflicting, the combination in any mutually of the feature in embodiment and embodiment in the application.
First by reference to the accompanying drawings, embodiments of the invention one are described.
The embodiment of the present invention provides a kind of liquid crystal display control system, and this system architecture as shown in Figure 1, comprising:
Processor 101, embedded control chip 102 and liquid crystal display 103;
Described processor 101 and be connected to described embedded control chip 102 by the first bus;
Described embedded control chip 102 is connected to described liquid crystal display 103 by the second bus, sends PWM brightness control signal and/or screen backlight enable signal by described the second bus to described liquid crystal display 103.
Preferably, described processor 101 is YHFT-DSP processor.
Preferably, this system also comprises power supply soft starting circuit 104, and this power supply soft starting circuit 104 is connected with power supply 105;
Described power supply soft starting circuit 104 is connected with described embedded control chip 102, receives the power supply enable signal that described embedded chip 102 sends;
Described power supply soft starting circuit 105 is connected with described liquid crystal display 103, for described liquid crystal display 103 is powered.
Preferably, this system also comprises Hall element 106;
Described Hall element 106 is connected to described embedded control chip 102.
Preferably, described the first bus and the second bus are SMBUS bus.
Based on said system, processor 101 can be controlled liquid crystal display 103 via embedded control chip 102.Described liquid crystal display 103 is specially LCD.
Below in conjunction with accompanying drawing, embodiments of the invention two are described.
The embodiment of the present invention provides a kind of liquid crystal display control method, the liquid crystal display control system providing in conjunction with embodiments of the invention one, can carry out that screen message reads to liquid crystal display, screen opening and close, the operation such as brightness regulation.
First, the operation of reading LCD information is described.
Embedded control chip is communicated by letter with described liquid crystal display by the second bus, obtain the information (as manufacturer, model, size, resolution etc.) of this liquid crystal display, and described information is stored in the internal register of this embedded control chip, then processor reads described information by described the first bus from the internal register of described embedded control chip.Leave in internal register.
Optionally, operating system can be resolved through register and above-mentioned information shown under system to (display device that is connected in this embedded chip by liquid crystal display or other).
Below, to controlling, LCD opens, the operation of brightness regulation describes.
(1) embedded control chip collecting ring environment information, concrete, and described environmental information is: the exporting change information of system boot information or the Hall element that is connected with described embedded control chip.
Embedded control chip detect system boot (start button be pressed after mainboard start to power on, power on is in sequence chronologically, the Powergood signal of that power supply finally getting up on embedded control chip meeting detecting master plate, if having got up with regard to judgement system is to have started shooting) or detect the operation of uncapping (magnet of screen below, away from Hall element, makes the output of sensor be uprised by low) under open state.It should be noted that; corresponding relation between the exporting change of Hall element and start event (operation of uncapping) can freely configure according to demand; output can be raise and start event establishment corresponding relation; also output can be reduced and start event establishment corresponding relation; embodiments of the invention are not restricted this, as long as can realize the scheme that determines whether executable operations by the output of Hall element all in protection scope of the present invention.
Collecting after environmental information, embedded control chip can, according to described environmental information, send corresponding control signal to liquid crystal display and show control, specific as follows:
(2) open " power supply enable signal ", open power supply soft starting circuit, LCD is started working;
(3) described embedded control chip is opened the PWM brightness control signal in the second bus, for the peak pulse duration of adjusting screen backlight illumination;
Under open state, PWM brightness control signal sends always, it is a high-low-high-low pulse signal, by recently brightness adjusting of duty.For instance, in the time of screen maximum brightness, the dutycycle of PWM is 100%, is high level entirely.When screen intensity dims, dutycycle becomes 90%, 80%, and 70% ...So PWM can export high-low-high-low pulse signal always, just low and high level proportion difference.
When screen opening, be first to open PWM brightness control signal, wait PWM just screen backlight enable signal to be opened after stable because PWM when starting LCD may glimmer, user just can't see screen flicker like this.
(4), in order to ensure LCD stable output, just open " screen backlight enable signal " by the backlight lightening of LCD after PWM brightness control signal has been opened, the output of system shows normally on screen;
(5) in the time that user readjusts the brightness of LCD by keyboard or other modes, first operating system passes to embedded control chip by instruction by YHFT-DSP processor, and embedded control chip goes control " PWM brightness control signal " to realize LCD brightness regulation after receiving operational order.
The operating process of below control LCD being closed describes.
(1) embedded control chip collecting ring environment information, concrete, embedded control chip detects system closedown, or detects the lid operation (magnet of screen below, near Hall element, makes the output of sensor by high step-down) under open state.
Collecting after environmental information, embedded control chip can be according to described environmental information, closes successively screen backlight enable signal, PWM brightness control signal and power supply enable signal, specific as follows:
(2) embedded control chip is closed " screen backlight enable signal ", and the backlight of screen closed;
(3) secondly close " PWM brightness control signal ";
Screen closing sequence is first to close screen backlight enable signal to close PWM brightness control signal again, because first after backlight closing, and the flicker of lcd screen when user just can't see PWM and closes.
(4) finally close " power supply enable signal ", close the working power of screen.
Embodiments of the invention provide a kind of liquid crystal display control system and method, this system comprises processor, embedded control chip and liquid crystal display, described processor and be connected to described embedded control chip by first bus, described embedded control chip is connected to described liquid crystal display by the second bus, sends PWM brightness control signal and/or screen backlight enable signal by described the second bus to described liquid crystal display.Embedded control chip collecting ring environment information, according to described environmental information, send corresponding control signal to liquid crystal display and show control, realized the control of YHFT-DSP processor to lcd screen, solved the problem that does not have YHFT-DSP processor to support lcd screen control program.
The all or part of step that one of ordinary skill in the art will appreciate that above-described embodiment can realize by computer program flow process, described computer program can be stored in a computer-readable recording medium, described computer program (as system, unit, device etc.) on corresponding hardware platform is carried out, in the time carrying out, comprise step of embodiment of the method one or a combination set of.
Alternatively, all or part of step of above-described embodiment also can realize with integrated circuit, and these steps can be made into respectively integrated circuit modules one by one, or the multiple modules in them or step are made into single integrated circuit module realize.Like this, the present invention is not restricted to any specific hardware and software combination.
Each device/functional module/functional unit in above-described embodiment can adopt general calculation element to realize, and they can concentrate on single calculation element, also can be distributed on the network that multiple calculation elements form.
Each device/functional module/functional unit in above-described embodiment is realized and during as production marketing independently or use, can be stored in a computer read/write memory medium using the form of software function module.The above-mentioned computer read/write memory medium of mentioning can be ROM (read-only memory), disk or CD etc.
Any be familiar with those skilled in the art the present invention disclose technical scope in, can expect easily change or replace, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain described in claim.
Claims (10)
1. a liquid crystal display control system, is characterized in that, comprises processor, embedded control chip and liquid crystal display;
Described processor and be connected to described embedded control chip by the first bus;
Described embedded control chip is connected to described liquid crystal display by the second bus, sends PWM brightness control signal and/or screen backlight enable signal by described the second bus to described liquid crystal display.
2. liquid crystal display control system according to claim 1, is characterized in that, described processor is YHFT-DSP processor.
3. liquid crystal display control system according to claim 1, is characterized in that, this system also comprises power supply soft starting circuit, and this power supply soft starting circuit is connected with power supply;
Described power supply soft starting circuit is connected with described embedded control chip, receives the power supply enable signal that described embedded chip sends;
Described power supply soft starting circuit is connected with described liquid crystal display, is described LCD device electric supply.
4. liquid crystal display control system according to claim 1, is characterized in that, this system also comprises Hall element;
Described Hall element is connected to described embedded control chip.
5. liquid crystal display control system according to claim 1, is characterized in that, described the first bus and the second bus are SMBUS bus.
6. the liquid crystal display control method that uses the liquid crystal display control system as described in as arbitrary in claim 1 to 5, is characterized in that, comprising:
Embedded control chip collecting ring environment information;
Described embedded control chip, according to described environmental information, sends corresponding control signal to liquid crystal display and shows control.
7. liquid crystal display control method according to claim 6, it is characterized in that, described environmental information is: the exporting change information of system boot information or the Hall element that is connected with described embedded control chip, described embedded control chip, according to described environmental information, sends corresponding control signal to liquid crystal display and shows that control is specially:
Described embedded control chip is opened the PWM brightness control signal in the second bus, to regulate the peak pulse duration of described liquid crystal display device backlight lightness;
After opening described PWM brightness control signal, described embedded control chip sends screen backlight enable signal to described liquid crystal display, by the backlight lightening of described liquid crystal display.
8. liquid crystal display control method according to claim 6, it is characterized in that, described environmental information is the brightness regulation instruction that processor sends to described embedded control chip, described embedded control chip, according to described environmental information, sends corresponding control signal to liquid crystal display and shows that control comprises:
Described embedded control chip sends PWM brightness control signal to described liquid crystal display, indicates described liquid crystal display to regulate brightness.
9. liquid crystal display control method according to claim 6, it is characterized in that, described environmental information is: the variation of the output of system closedown or the Hall element that is connected with described embedded control chip, described embedded control chip, according to described environmental information, sends corresponding control signal to liquid crystal display and shows that control is specially:
Described embedded control chip is closed screen backlight enable signal, PWM brightness control signal and power supply enable signal successively.
10. liquid crystal display control method according to claim 6, is characterized in that, the method also comprises:
Described embedded control chip is communicated by letter with described liquid crystal display by the second bus, obtains the information of this liquid crystal display, and described information is stored in the internal register of this embedded control chip;
Described processor reads described information by described the first bus from the internal register of described embedded control chip.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410252918.5A CN104007949A (en) | 2014-06-09 | 2014-06-09 | Liquid crystal display control system and method |
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| CN201410252918.5A CN104007949A (en) | 2014-06-09 | 2014-06-09 | Liquid crystal display control system and method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105304027A (en) * | 2015-10-12 | 2016-02-03 | 武汉华星光电技术有限公司 | Control circuit and control method of backlight and liquid crystal display device |
| 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 |
| CN109298750A (en) * | 2017-12-13 | 2019-02-01 | 中航华东光电（上海）有限公司 | A kind of reinforcement type intelligent display |
| CN111526403A (en) * | 2020-03-30 | 2020-08-11 | 龙芯中科技术有限公司 | Display device, method and electronic equipment |
-
2014
- 2014-06-09 CN CN201410252918.5A patent/CN104007949A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105304027A (en) * | 2015-10-12 | 2016-02-03 | 武汉华星光电技术有限公司 | Control circuit and control method of backlight and liquid crystal display device |
| US9892690B2 (en) | 2015-10-12 | 2018-02-13 | Wuhan China Star Optoelectronics Technology Co., Ltd. | Control circuit for backlight, a control method and a liquid crystal display device |
| 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 |
| CN109298750A (en) * | 2017-12-13 | 2019-02-01 | 中航华东光电（上海）有限公司 | A kind of reinforcement type intelligent display |
| CN111526403A (en) * | 2020-03-30 | 2020-08-11 | 龙芯中科技术有限公司 | Display device, method and electronic equipment |
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