CN100359932C - Self-adapting method for adjusting brightness in liquid crystal TV set - Google Patents
Self-adapting method for adjusting brightness in liquid crystal TV set Download PDFInfo
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- CN100359932C CN100359932C CNB200510043690XA CN200510043690A CN100359932C CN 100359932 C CN100359932 C CN 100359932C CN B200510043690X A CNB200510043690X A CN B200510043690XA CN 200510043690 A CN200510043690 A CN 200510043690A CN 100359932 C CN100359932 C CN 100359932C
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Abstract
The present invention relates to a self-adaption brightness adjusting method for a liquid crystal TV set, which belongs to the technology of a liquid crystal TV. The present invention comprises the steps that a CPU outputs a specific period and a PWM square signal of a duty ratio according to the set of a procedure, the specific period and the PWM square signal of a duty ratio become a definite direct current level by filtering and shaping, and the direct current level is used as an external brightness control signal and is sent to a digital video image processing and judgment module; the CPU simultaneously outputs a switch high-low level signal of a selft-adaption brightness regulation AI to the digital video image processing and judgment module so as to control a switching programme of the function of the AI; the digital video image processing and judgment module outputs self-adaption brightness control signal to a brightness control foot of a backlight lamp, and thus, a step of the brightness self-adaption control of the whole set of the liquid crystal TV, etc. can be realized at last. The present invention can improve the subjective contrast of a picture, increases the level sense and the brightness of a picture, and can obviously improve the display effect of the whole set under the condition that the contrast of a liquid crystal display device is not changed. The present inventoin can be widely used in various liquid crystal TV sets.
Description
Technical field
The invention belongs to technical field of television sets, more particularly relate to the design of the self-adapting method for adjusting brightness of liquid crystal TV set, that is relate to the application of liquid crystal display, the control and the Digital Video Processing technology of LCD TV complete machine.
Background technology
Along with the development of Display Technique, novel display device replaces traditional CRT monitor gradually, occupies increasing share in TV market.LCD is exactly important a kind of in the new display spare.Along with the raising of cost performance, increasing has fast appearred in nearly 2 years liquid crystal TV sets.Liquid crystal display has significantly gap with respect to CRT and Plasma Display aspect contrast, this makes the display effect of liquid crystal TV set exist stereovision poor, the shortcoming that the bright degree of picture is not enough.
In addition, traditional liquid crystal TV set does not provide AI switch to the user, and " mode standard " that the user can't select to control brightness of backlight voluntarily still reduces " energy saver mode " of Overall Power Consumption.
Summary of the invention
Purpose of the present invention just is to overcome above-mentioned shortcoming and defect, and a kind of self-adapting method for adjusting brightness of liquid crystal TV set is provided.The method that it adopts circuit system to match with the liquid crystal display screen internal circuit is adjusted liquid crystal screen backlight lamp brightness according to the brightness of display frame content, improves subjective contrast, the stereovision that increases image and the actual effect of bright degree thereby reach.Under the constant situation of the contrast of liquid crystal display device own, improve the subjective contrast of LCD TV, obviously improve the display effect of complete machine.
Another purpose of the present invention is to provide AI switch to the user, make the user can select whether to use the AI function voluntarily: the backlight lamp control function that perhaps starts liquid crystal TV set, perhaps adjust complete machine as required and be in " energy saver mode ", to reduce the power consumption of complete machine.
In order to achieve the above object, the present invention includes following steps:
(1) by the CPU of liquid crystal TV set setting according to program, the PWM square-wave signal of output specific period and duty ratio after filtering and shaping circuit, becomes certain DC level, as the brightness control signal of outside, deliver to digital video image and handle and judge module;
(2) handle and judge module the switch of control AI function to digital video image by the switch high-low level signal of CPU output adaptive brightness adjustment simultaneously AI;
(3) from digital video image handle and judge module output adaptive brightness control signal to the brilliance control pin of backlight, thereby final realization is to the brightness adaptive control of LCD TV complete machine.
Above-mentioned steps (3) comprises step by step following:
A. the adding under the AI switching signal control of interface section, the digital processing chip of opening core is carried out AI and is handled;
B. with digital processing chip reading of data from the LVDS digital video signal that receives, handle, utilize inner Processing Algorithm, the data that prestore in the while reference memory, the most contents of judging current video signal is in high brightness or low-light level;
If judge that c. the whole image major part is in highlighted state, so, the numerical value of the inside brightness control signal of corresponding raising output, the concrete numerical value that changes decides according to the brightness degree of input signal;
Be in low bright state if d. judge the major part of whole image, so, the numerical value of the inside brightness control signal of corresponding reduction output, the concrete numerical value that changes decides according to the brightness degree of input signal;
E. control the brightness diverter switch simultaneously with the AI switch of outside, make the brilliance control pin that finally outputs to backlight through the inside brightness control signal of adjusting, the brightness of the backlight that control is outside, thus realize adaptive brightness adjustment.
The present invention relates to following aspect: the main body of LCD TV; The generation of brightness control signal (comprising relevant software control); Digital video image is handled and judge module (comprising associated liquid crystal display screen module and the interface section between the circuit system).
CPU controls whole system operation.EEPROM stores some data parameters that makes the reliable and stable work of components and parts and programs, uses when initialization data and the refresh data for CPU.Digital processing circuit is the core devices of signal processing, and portion finishes the format conversion and the image effect processing of signal within it, and the signal of handling is with the required form output in display part, rear end.The signal format change-over circuit receives the picture signal of digital processing circuit output, and is converted to the LVDS digital signals format that Liquid Crystal Module needs, reproduced image.Sound treatment circuit receives the voice signal of audio frequency terminal output, and signal is carried out sending loud speaker and earphone sounding after frequency range processing, effect process, the power amplification.Analog signal interface receives the analog signal of outside input and the analog signal after the output inter-process, as: the CVBS signal, YPBPR, YCBCR, Y/C, analog rgb, simulated audio signal etc., and can receive and demodulation RF signal, send rear end A/D change-over circuit to handle.The A/D change-over circuit is finished the analog/digital conversion of signal, and the digital processing circuit that the digital signal after the conversion is given the rear end carries out signal processing.Digital signal interface receives the digital signal of outside input, as: digital rgb signal, ITU-R601 signal etc.Channel selecting selects 1 the tunnel to send back-end circuit to handle under the control of CPU from the multichannel input signal.
What need stress is that the signal that transmits between LCD and the circuit system mainly contains three parts: the vision signal of LVDS form; Power supply; Control signal.Control signal has realized setting and the function control of circuit system to the LCD special parameter, involved in the present invention to the brightness adjustment also be realize by this part.
According to above-mentioned principle, can also in television set, install the AI switching programme, make the user select whether to use the AI function voluntarily by menu.When the user selects to open the AI function, can regulate complete machine according to above-mentioned steps and be in " standard " state, when the user selected to close the AI function, complete machine then was in " energy-conservation " state.
Because CPU can realize the switch of AI function by the AI control signal, can directly adjust the brightness of backlight simultaneously by the pwm control signal of output, therefore, the present invention can reach according to user's needs and regulate the purpose that complete machine is in " standard " or " energy-conservation " state simultaneously.
The advantage of digital technology makes it be deep into TV technology.It has not only brought into play more and more important effect at aspects such as image processing, also match with devices such as LCD, has remedied the deficiency of liquid crystal display device itself in some aspects.The subjective effect and the performance of liquid crystal TV set complete machine are greatly improved.
Task of the present invention comes to this and finishes.
The method that the present invention adopts circuit system to match with the LCD internal circuit, adjust the brightness of LCD backlight lamp according to the brightness of display frame content, improve subjective contrast, the stereovision that increases image and the actual effect of bright degree thereby reach.It can improve the subjective contrast of LCD TV under the constant situation of the contrast of liquid crystal display device own, obviously improve the display effect of complete machine.Simultaneously, the present invention also provides AI switch to the user, makes the user can select whether to use the AI function voluntarily: the backlight lamp control function that perhaps starts liquid crystal TV set; Perhaps adjust complete machine as required and be in " energy saver mode ", to reduce the power consumption of complete machine.It can be widely used in the various liquid crystal TV sets.
Description of drawings
Fig. 1 is the operation principle block diagram of liquid crystal TV set of the present invention.
The block diagram that Fig. 2 produces for brightness control signal.
The circuit diagram that Fig. 3 produces for brightness control signal.
Fig. 4 is the block diagram of digital video image processing and judge module.
Embodiment
Embodiment 1.A kind of self-adapting method for adjusting brightness of liquid crystal TV set is as Fig. 1～shown in Figure 4.It may further comprise the steps:
(1) by the CPU of liquid crystal TV set setting according to program, the PWM square-wave signal of output specific period and duty ratio after filtering and shaping circuit, becomes certain DC level, as the brightness control signal of outside, deliver to digital video image and handle and judge module;
(2) handle and judge module the switch of control AI function to digital video image by the switch high-low level signal of CPU output adaptive brightness adjustment simultaneously AI;
(3) from digital video image handle and judge module output adaptive brightness control signal to the brilliance control pin of backlight, thereby final realization is to the brightness adaptive control of LCD TV complete machine.
Above-mentioned steps (3) comprises step by step following:
A. the adding under the AI switching signal control of interface section, the digital processing chip of opening core is carried out AI and is handled;
B. with digital processing chip reading of data from the LVDS digital video signal that receives, handle, utilize inner Processing Algorithm, the data that prestore in the while reference memory, the most contents of judging current video signal is in high brightness or low-light level;
If judge that c. the whole image major part is in highlighted state, so, the numerical value of the inside brightness control signal of corresponding raising output, the concrete numerical value that changes decides according to the brightness degree of input signal;
Be in low bright state if d. judge the major part of whole image, so, the numerical value of the inside brightness control signal of corresponding reduction output, the concrete numerical value that changes decides according to the brightness degree of input signal;
E. control the brightness diverter switch simultaneously with the AI switch of outside, make the brilliance control pin that finally outputs to backlight through the inside brightness control signal of adjusting, the brightness of the backlight that control is outside, thus realize adaptive brightness adjustment.
Fig. 1 is the block diagram that is used to illustrate the liquid crystal TV set operation principle.Liquid crystal TV set increases adaption brightness adjustment (AI) function, mainly comprises three parts: the generation of luminance signal and control section, digital video image processing and judge module, standard interface part (liquid crystal display signal interface and backlight interface).
Fig. 2, Fig. 3 are respectively block diagram and the circuit diagram that brightness control signal produces.Associated LCD MODULE and the interface section between the circuit system have also been comprised among the figure.
Fig. 4 is the block diagram of digital video image processing and judge module.This part has mainly comprised parts such as the memory of digital processing chip, chip periphery of core and diverter switch.
CPU is according to the setting of program, and the PWM square-wave signal of output specific period and duty ratio after filtering and shaping circuit, becomes certain DC level (0-3.3V), as the brightness control signal of outside, delivers to digital video image and handles and judge module.Simultaneously, the brightness of CPU output adaptive is adjusted the switching signal (3.3V/0 high-low level signal) of (AI) and is handled and judge module to digital video image, the switch of control AI function.Adjust the brilliance control pin that signal outputs to backlight from the adaption brightness that digital video image is handled and judge module is exported, thus the final brightness adaptive control that realizes the LCD TV complete machine.
Adding under the control of AI switching signal, opening the digital processing chip of core and carry out the AI processing.Digital processing chip is reading of data from the LVDS digital video signal that receives, and handles, and utilizes inner Processing Algorithm, the data that the while reference memory prestores, and the most contents of judging current video signal is in high brightness or low-light level.Be in highlighted state if judge the whole image major part, so, the numerical value of the inside brightness control signal of corresponding raising output (the concrete numerical value that changes will decide according to the brightness degree of input signal).Same, if the major part of picture is in low bright state, so, the numerical value of the inside brightness control signal of corresponding reduction output (the concrete numerical value that changes decides according to the brightness degree of input signal).Outside AI switch has been controlled brightness diverter switch part simultaneously, makes through the inside brightness control signal of adjusting finally to export, and the backlight part that control is outside, thus realized adaptive brightness adjustment
Luminance signal generation and digital video image processing and judge module cooperatively interact by the interface of standard, have realized that finally complete machine comes self adaptation to regulate the brightness of backlight according to the content of display image.
Installing AI switching programme makes the user select whether to use the AI function voluntarily by menu in television set.When the user selected to open the AI function, complete machine was in " standard " state, and when the user selected to close the AI function, complete machine then was in " energy-conservation " state.
It can be widely used in the various liquid crystal TV sets.
Claims (2)
1. the self-adapting method for adjusting brightness of a liquid crystal TV set is characterized in that it may further comprise the steps:
(1) by the CPU of liquid crystal TV set setting according to program, the PWM square-wave signal of output specific period and duty ratio after filtering and shaping circuit, becomes certain DC level, as the brightness control signal of outside, deliver to digital video image and handle and judge module;
(2) handle and judge module the switch of control AI function to digital video image by the switch high-low level signal of CPU output adaptive brightness adjustment simultaneously AI;
(3) from digital video image handle and judge module output adaptive brightness control signal to the brilliance control pin of backlight, thereby final realization to the brightness adaptive control of LCD TV complete machine, said step (3) comprises step by step following:
A. the adding under the AI switching signal control of interface section, the digital processing chip of opening core is carried out AI and is handled;
B. with digital processing chip reading of data from the LVDS digital video signal that receives, handle, utilize inner Processing Algorithm, the data that prestore in the while reference memory, the most contents of judging current video signal is in high brightness or low-light level;
If judge that c. the whole image major part is in highlighted state, so, the numerical value of the inside brightness control signal of corresponding raising output, the concrete numerical value that changes decides according to the brightness degree of input signal;
Be in low bright state if d. judge the major part of whole image, so, the numerical value of the inside brightness control signal of corresponding reduction output, the concrete numerical value that changes decides according to the brightness degree of input signal;
E. control the brightness diverter switch simultaneously with the AI switch of outside, make the brilliance control pin that finally outputs to backlight through the inside brightness control signal of adjusting, the brightness of the backlight that control is outside, thus realize adaptive brightness adjustment.
2. according to the self-adapting method for adjusting brightness of the described liquid crystal TV set of claim 1, it is characterized in that installing AI switching programme in television set, make the user select whether to use the AI function voluntarily by menu, when the user selects to open the AI function, can regulate complete machine according to a in the above-mentioned steps (3)～e and be in " standard " state, when the user selected to close the AI function, complete machine then was in " energy-conservation " state.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US8447363B2 (en) * | 2007-03-26 | 2013-05-21 | Nec Corporation | Mobile phone terminal, image display control method, program thereof and program recording medium |
| CN101110968B (en) * | 2007-08-17 | 2011-10-05 | 周来 | Video image processing circuit and method thereof |
| KR101441383B1 (en) * | 2007-12-03 | 2014-09-18 | 엘지디스플레이 주식회사 | Liquid crystal display device and method for driving the same |
| CN102945662B (en) * | 2012-10-29 | 2016-04-06 | 深圳市路畅科技股份有限公司 | A kind of energy-saving control method of display and display controller |
| CN105828495B (en) * | 2015-01-09 | 2019-01-22 | 鸿富锦精密工业(武汉)有限公司 | backlight brightness control system |
| CN107046628B (en) * | 2017-03-15 | 2019-11-19 | 四川长虹电器股份有限公司 | A kind of method that low-light level 8K television set shows HDR effect |
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| WO2003091791A1 (en) * | 2002-04-26 | 2003-11-06 | Electronics And Telecommunications Research Institute | Apparatus and method for reducing power consumption by adjusting backlight and adapting visual signal |
| CN1520243A (en) * | 2003-02-07 | 2004-08-11 | ӡ�����Ƽ��ɷ�����˾ | Inverter controller with auto brightness regulation circuit |
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Patent Citations (7)
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| CN1039694A (en) * | 1988-07-16 | 1990-02-14 | 杨耀鑫 | Used as television illuminating lamp automatic light modulating method and device thereof |
| CN1361587A (en) * | 2000-12-27 | 2002-07-31 | 麒正电子企业股份有限公司 | DC-to-AC bright lamp converter for LCD back lighting board |
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| CN1367637A (en) * | 2002-01-27 | 2002-09-04 | 海尔集团公司 | Intelligent control background lamp of TV set |
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