CN100583229C - LCD device - Google Patents
LCD device Download PDFInfo
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- CN100583229C CN100583229C CN200810015646A CN200810015646A CN100583229C CN 100583229 C CN100583229 C CN 100583229C CN 200810015646 A CN200810015646 A CN 200810015646A CN 200810015646 A CN200810015646 A CN 200810015646A CN 100583229 C CN100583229 C CN 100583229C
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Abstract
The present invention provides a LCD display device, which comprises an image input interface, an image processing unit, a LCD, and a backlight source, wherein, the backlight source is divided into at least two backlight source zones, and each backlight source zone comprises a LED driver; the image processing unit comprises an image analysis unit, a zoning unit, a backlight source driver, and a central processing unit; the backlight source driver comprises at least a MCU, and the MCU allocates a data register and a register address for the LED driver that driven by it; the central processing unit writes the backlight brightness correction value for each backlight source zone into the data register of the corresponding MCU; the MCU produces an appropriate driving signal for the corresponding LED driver. The LCD display device provided in the present invention controls the backlight source drivers in a serial mode, and thereby can reduce the cost and the size of the backlight source.
Description
Technical field
The present invention relates to a kind of display device, relate to a kind of liquid crystal indicator that can dynamically adjust backlight illumination more specifically.
Background technology
Lcd technology has obtained development fast in recent years, but contrasts the display technique of other kinds, and liquid crystal display is still having gap aspect contrast and the color saturation.
The liquid crystal display (LCD) of liquid crystal indicator (as LCD TV) itself is not luminous, but belong to the backlight display device, there is backlight behind at liquid crystal display, and liquid crystal indicator is to show or go back original picture by the light that evenly distributed tiny liquid crystal particle on the screen sends by " blocking-up " and " opening " backlight.In the starting stage, as long as the LCD energized, backlight is just in work, even picture displayed is the black full picture of a width of cloth, backlight is also in work.That is to say that the backlight of LCD TV is forever luminous.Because the transmittance of liquid crystal is extremely low, make the brightness of LCD TV reach the degree that is enough to perfect display frame, the brightness of backlight will be very high, so not only can shorten the serviceable life of the backlight of liquid crystal indicator, and make beholder's eyes become tired easily; And if reduce the brightness of backlight, then can reduce the contrast and the color saturation of shown image.
The appearance of regulation technology backlight and development address this problem to a certain extent, utilize regulation technology backlight dynamically to adjust backlight according to image content, concrete method is that backlight dynamic point brightening circuit system (generally adopting programmable logic device (PLD) and a plurality of hardware device) is set, according to image content backlight illumination is controlled, regulated to backlight, guarantee the contrast and the color saturation of image on the one hand, prolong the serviceable life of backlight on the other hand.
As a kind of improvement of regulation technology backlight, a kind of backlight is divided into a plurality of zones, the technology of the backlight zones of different being carried out adjustment backlight respectively also begins to occur.This technology is adjusted the brightness of backlight according to the image of the subregion correspondence of backlight, and this technology has improved the quality of liquid crystal display to a great extent, and subregion is many more in the ordinary course of things, and its display effect is just good more.Yet too much backlight subregion can make the control of the backlight difficulty that becomes, increasing simultaneously along with subregion, the control device of backlight part is also more and more, the increase that these are not only a large amount of the cost of backlight, and make the volume of backlight become big.Therefore, this area needs a kind of control method of backlight easily to solve this problem.
Summary of the invention
In order to address the above problem, the invention provides a kind of liquid crystal indicator, control each zone of backlight by the method for serial, solved problems of the prior art.
Concrete, liquid crystal indicator of the present invention comprises image input interface, image processing apparatus, LCDs and backlight, and described backlight is divided at least two backlight subregions, and each backlight subregion comprises a led driver; Described image processing apparatus comprises image analyzing unit, zoning unit, backlight driver and central processing unit; Described image input interface receives picture signal, zoning unit is divided at least two picture portions according to the backlight subregion with picture signal, image analyzing unit calculates the typical brightness data of each picture portion, and central processing unit goes out the backlight illumination modified value of each backlight subregion according to the typical brightness data computation of each picture portion; Described backlight driver comprises DC/DC power supply and at least one MCU, and described MCU is powered by described DC/DC power supply, drives at least one led driver; Described MCU is that the led driver that is driven distributes a data register and a register address, and central processing unit writes the backlight illumination modified value of each backlight subregion the data register the inside of corresponding M CU according to the register address of MCU; MCU produces the corresponding driving signal and gives corresponding led driver according to the data of each data register, and described central processing unit is communicated by letter with described MCU by universal serial bus, comprises iic bus and spi bus.
Described backlight is divided into the rectangular backlight source partition of the capable N row of M, and described backlight driver comprises M MCU, and each MCU drives the led driver of N backlight region correspondence of every row.
When described image analyzing unit calculated the typical brightness data of delegation's picture portion, central processing unit write the backlight illumination modified value of lastrow backlight subregion the data register of corresponding M CU.
Described drive signal is pwm signal or level signal.
Described image analyzing unit, zoning unit and central processing unit are integrated in a SOC the inside.
Described led driver drives by voltage system.
Liquid crystal indicator of the present invention has reduced data line sum between front-end control device and the driving element with a kind of serial mode control backlight driver, has reduced by the sum of light source device, has reduced cost, has also reduced the volume of backlight simultaneously.
Description of drawings
Figure 1 shows that the synoptic diagram of a LCD TV.
Figure 2 shows that the schematic diagram of televisor 100.
Figure 3 shows that the schematic diagram of the backlight controller of televisor 100.
Figure 4 shows that the synoptic diagram of embodiment of the backlight controller of liquid crystal indicator of the present invention.
Embodiment
In order to make those skilled in the art person understand the present invention program better, and above-mentioned purpose of the present invention, feature and advantage can be become apparent more, be example with the LCD TV below, the present invention is further detailed explanation with embodiment in conjunction with the accompanying drawings.
Figure 1 shows that the synoptic diagram of a LCD TV.As shown in the figure, televisor 100 comprises LCDs 130.Figure 2 shows that the schematic diagram of televisor 100.As shown in the figure, televisor 100 comprises image input interface 110, image processing apparatus 120, LCDs 130 and backlight 140.Described image processing apparatus 120 comprises image analyzing unit 121, zoning unit 122, liquid crystal interface unit 123, backlight driver 124 and central processing unit 125.Described image processing apparatus 120 can be made up of a plurality of discrete devices, also can be integral structure, is integrated on the chip piece, for example is integrated in a SOC the inside.Described backlight 140 is divided into several backlight subregions.
Picture signal after the subregion is transported to image analyzing unit 121,121 pairs of these picture signals of image analyzing unit are analyzed, calculate the typical brightness data of each area image, and the typical brightness data that will calculate each area image send to central processing unit 125.Central processing unit 125 calculates each regional backlight illumination modified value according to the typical brightness data and the related data (typical brightness data of the backlight illumination of for example current each backlight subregion, former each picture portions of two field picture or the like) of each area image equally.
After calculating current each regional backlight illumination modified value, central processing unit 125 sends to backlight driver 124 and liquid crystal interface unit 123 with this backlight illumination modified value.
Each regional backlight illumination modified value that backlight driver 124 is determined according to central processing unit 125 generates the respective regions of giving described backlight 140 with the corresponding drive signal of this backlight illumination modified value, thereby realizes each regional backlight illumination is regulated.
At present, backlight driver 124 is generally controlled the brightness of backlight by pwm signal.As shown in Figure 3, when the backlight illumination modified value of backlight driver 124 according to each backlight subregion, the PWM drive signal that produces each backlight subregion is given the led driver of each backlight subregion.Because led driver needs to drive a plurality of LED fluorescent tubes simultaneously, the pwm signal itself that backlight driver 124 produces can not produce enough power, therefore all need this PWM drive signal to be amplified in each PWM drive signal, so that corresponding led driver drives the LED fluorescent tube of backlight subregion through a high-power constant-flow driver.Suppose that backlight 140 is divided into N backlight subregion, then backlight driver 124 needs N high-power constant-flow driver that the PWM drive signal of its generation is amplified at most.Because high-power constant-flow driver price general charged is higher, the cost of this driving method is obviously very high, and because the volume of DC/DC amplifier is generally all bigger, it is bigger that this just makes that the volume of backlight becomes.
Figure 4 shows that the synoptic diagram of embodiment of the backlight controller of liquid crystal indicator of the present invention.As shown in the figure, backlight driver 224 has comprised several microcontrollers MCU (Micro control unit), each MCU by the power supply of DC/DC power supply, drives several led drivers, and each led driver is here all distinguished a backlight subregion of corresponding backlight.Simultaneously, each MCU originally distributes a data register and an address as each led driver.Can determine the led driver number that each MCU drives according to the size of MCU.
When image processing apparatus 120 work, central processing unit 125 calculates the backlight illumination modified value of each backlight subregion, and communicate by serial communication and MCU, according to the register address of MCU, the backlight illumination modified value of each backlight subregion is write the register the inside of corresponding M CU.
At last, MCU produces the corresponding driving signal and gives corresponding led driver according to the data of each register the inside.The MCU of present embodiment itself is by independent DC/DC power supply power supply, and the drive signal of its generation enough drives corresponding led driver, therefore, does not need to add high-power constant-flow driver between MCU and led driver.
Be that 80 subregions are example with the backlight subregion below, the course of work of the backlight driver 124 of present embodiment is illustrated.For convenience of description, suppose that here all backlight subregions all are equal-sized rectangles, be about to the matrix that the entire backlight source is divided into 10 row, 8 row, and backlight driver 124 adopts 10 MCU, each MCU drives the led driver in 8 zones of every row.
When televisor 100 is started working, image processing apparatus 120 begins the data statistics of a field picture according to the field enable signal of picture signal, at first the view data of 10 picture portions of 121 pairs first row of image analyzing unit is analyzed, count the typical brightness data of first each picture portion of row, and send it to central processing unit 125, central processing unit 125 is according to the typical brightness data of these picture portions, the backlight illumination modified value of 10 the backlight subregions of delegation that calculate.
By that analogy, central processing unit 125 writes the pairing backlight illumination modified value of each backlight subregion in the middle of the relevant register respectively, MCU is according to the data in the register, produce the corresponding driving signal corresponding led driver is driven, so just reached the purpose of dynamic adjustment backlight illumination.
In the present embodiment, because a MCU can drive a plurality of led drivers (for example 16), promptly use a DC/DC power supply to replace several original DC/DC amplifiers, this has just significantly reduced the quantity of DC/DC converter, not only provide cost savings significantly, also reduced the volume of backlight driver simultaneously.
In sum, backlight driving method of the present invention has solved the control problem of a plurality of led drivers under the multi partition situation.Make liquid crystal indicator with a kind of serial mode control backlight driver, reduced data line sum between front-end control device and the driving element, reduced by the sum of light source device, reduced cost, also reduce simultaneously the volume of backlight, reduced the interference between the lead that too much causes because of data line.
Certainly; above-mentioned explanation is not to be limitation of the present invention; the present invention also is not limited in above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art are made in essential scope of the present invention also should belong to protection scope of the present invention.
Claims (9)
1, a kind of liquid crystal indicator comprises image input interface, image processing apparatus, LCDs and backlight, and described backlight is divided at least two backlight subregions, and each backlight subregion comprises a led driver; Described image processing apparatus comprises image analyzing unit, zoning unit, backlight driver and central processing unit; Described image input interface receives picture signal, zoning unit is divided at least two picture portions according to the backlight subregion with picture signal, image analyzing unit calculates the typical brightness data of each picture portion, central processing unit goes out the backlight illumination modified value of each backlight subregion according to the typical brightness data computation of each picture portion, it is characterized in that: described backlight driver comprises DC/DC power supply and at least one microcontroller, described microcontroller is powered by described DC/DC power supply, drives at least one led driver; Described microcontroller is that the led driver that is driven distributes a data register and a register address, central processing unit writes the backlight illumination modified value of each backlight subregion the data register the inside of corresponding microcontroller according to the register address of microcontroller; Microcontroller produces the corresponding driving signal and gives corresponding led driver according to the data of each data register; Described central processing unit is by universal serial bus and described micro-controller communications.
2, liquid crystal indicator according to claim 1, it is characterized in that: described backlight is divided into the rectangular backlight source partition of the capable N row of M, described backlight driver comprises M microcontroller, and each microcontroller drives the led driver of N backlight region correspondence of every row.
3, liquid crystal indicator according to claim 2, it is characterized in that: when described image analyzing unit calculated the typical brightness data of delegation's picture portion, central processing unit write the backlight illumination modified value of lastrow backlight subregion the data register of corresponding microcontroller.
4, according to the arbitrary described liquid crystal indicator of claim 1-3, it is characterized in that: described central processing unit is by iic bus and described micro-controller communications.
5, according to the arbitrary described liquid crystal indicator of claim 1-3, it is characterized in that: described central processing unit is by spi bus and described micro-controller communications.
6, according to the arbitrary described liquid crystal indicator of claim 1-3, it is characterized in that: described drive signal is a pwm signal.
7, according to the arbitrary described liquid crystal indicator of claim 1-3, it is characterized in that: described drive signal is a level signal.
8, according to the arbitrary described liquid crystal indicator of claim 1-3, it is characterized in that: described image analyzing unit, zoning unit and central processing unit are integrated in a SOC the inside.
9, according to the arbitrary described liquid crystal indicator of claim 1-3, it is characterized in that: described led driver drives by voltage system.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200810015646A CN100583229C (en) | 2008-03-26 | 2008-03-26 | LCD device |
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| CN200810015646A CN100583229C (en) | 2008-03-26 | 2008-03-26 | LCD device |
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| CN101281734A CN101281734A (en) | 2008-10-08 |
| CN100583229C true CN100583229C (en) | 2010-01-20 |
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Cited By (1)
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| CN105049836A (en) * | 2015-07-08 | 2015-11-11 | 四川长虹电器股份有限公司 | LED TV backlight partitioning rapid inspection method |
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| JP4686644B2 (en) * | 2009-07-07 | 2011-05-25 | シャープ株式会社 | Liquid crystal display |
| CN101989000B (en) * | 2009-07-30 | 2012-05-30 | 华映视讯（吴江）有限公司 | Color sequence liquid crystal display and liquid crystal display panel driving method thereof |
| US8514167B2 (en) * | 2009-09-23 | 2013-08-20 | Hong Kong Applied Science And Technology Research Institute Co., Ltd. | Method, system or apparatus for adjusting a brightness level associated with at least a portion of a backlight of a display device |
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| CN103117047B (en) * | 2013-03-14 | 2015-04-22 | 深圳市华星光电技术有限公司 | Backlight driving circuit, liquid crystal display device and driving method |
| US9165511B2 (en) | 2013-03-14 | 2015-10-20 | Shenzhen China Star Optoelectronics Technology Co., Ltd | Backlight driving circuit, LCD device, and driving method |
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2008
- 2008-03-26 CN CN200810015646A patent/CN100583229C/en active Active
Cited By (2)
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| CN105049836A (en) * | 2015-07-08 | 2015-11-11 | 四川长虹电器股份有限公司 | LED TV backlight partitioning rapid inspection method |
| CN105049836B (en) * | 2015-07-08 | 2017-03-01 | 四川长虹电器股份有限公司 | The quick inspection method in LED television backlight subarea |
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| CN101281734A (en) | 2008-10-08 |
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Address after: 266100 No. 151, Zhuzhou Road, Laoshan District, Shandong, Qingdao Patentee after: Hisense Video Technology Co.,Ltd. Address before: 266100 No. 151, Zhuzhou Road, Laoshan District, Shandong, Qingdao Patentee before: HISENSE ELECTRIC Co.,Ltd. |
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