CN1560679A - Flash backlight device and its operation method - Google Patents
Flash backlight device and its operation method Download PDFInfo
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- CN1560679A CN1560679A CNA2004100084906A CN200410008490A CN1560679A CN 1560679 A CN1560679 A CN 1560679A CN A2004100084906 A CNA2004100084906 A CN A2004100084906A CN 200410008490 A CN200410008490 A CN 200410008490A CN 1560679 A CN1560679 A CN 1560679A
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- lighting device
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Abstract
The invention discloses a flash back light device and the operation method, the device includes a light source intensity balancing model, flash control model and storing unit. In the invention, compares the current data frame and the previous data frame read from the image testing unit in the flash control model, when knows that the image playing is dynamic image through judgment, namely enables the flash back light source, when the image playing is static image, disables the flash back light source. In the invention, uses the light source intensity balancing model to control the intensity of the cold negative electrode fluorescence lamp in process playing dynamic image and static image.
Description
Technical field
The present invention relates to a kind of back lighting device, and be particularly related to and a kind ofly can determine whether activation according to device current state (static or dynamically), and flashing type back lighting device and its method of operating that can adjust brightness in good time.
Background technology
Liquid crystal (Liquid Crystal Display, be called for short LCD) be the material between crystal and liquid, is subjected to outside stimuluss such as electric field, and the assortment meeting of liquid crystal molecule is subjected to voltage and the characteristic that changes, and constitutes the demonstration assembly.
Liquid crystal material is to find the compound by Austrian zoophytologist F.Rinitzer fragrant acid and acetic acid from the breath of cholesterol in 1888 the earliest.It is used approximately since 1963, but until Japanese Sharp company successfully develops the counter LCD.The commercialization that has just confirmed lcd products is worth.Hereafter, Japanese manufacturer constantly is engaged in technical development, and the function of improved products makes LCD acquisition on various products gradually use widely.Be generalized to gradually by wrist-watch, electronic calculator on the numeral and figure indication of automobile, game machine and other testing tool, afterwards because the development of LCD colorize more is subjected to very big gazing at.Advantages such as LCD has gently, approaches, low voltage drive, volume are little, low consumpting power and applied range, be applied to recent years such as micro television, the demonstration of OA machine, mobile computer, projection color tv etc. gradually, and the trend that replaces iconoscope (CRT) is gradually arranged, be one of present product component of being gazed at most.
In known technology, the flashing type back lighting device is for when playing dynamic image, makes picture have more continuity and allows the user can clearlyer see the image of being play.So when the flashing type back lighting device activates, promptly activate a flashing type backlight simultaneously, to keep the brightness of picture.But the mean flow rate that the flashing type backlight is generated will be low than fixing mode backlight, and therefore when showing static image with the flashing type back lighting device, its display result will be fixing backlight darker than adopting, and picture has the sensation of flicker.
Summary of the invention
Therefore the object of the present invention is to provide a kind of flashing type back lighting device and its method of operating, that utilizes that the image verification unit detects that present picture plays is dynamic image or static image, to determine the whether activation backlight that glimmers.
The present invention provides a kind of flashing type back lighting device and its method of operating in addition, can control the work period of fluorescent lamp after computing, and can be equilibrated at dynamic image and the picture brightness when static image whereby.
The present invention proposes a kind of flashing type back lighting device, and this flashing type back lighting device can be when device detects dynamic image, activation flicker backlight, and when detecting static image flasher, this flicker backlight of forbidden energy.This flashing type back lighting device comprises flicker control module and storage element.
Above-mentioned storage unit stores has at least the (N-1) data frame.
Above-mentioned flicker control module comprises the image verification unit, according to the dynamic image inspection rule with N data frame being received with after (N-1) data frame that storage element is read is done computing, output check signal.Wherein, N is the positive integer more than or equal to 2.
Above-mentioned dynamic image inspection rule is in order to judge whether the flashing type back lighting device is to play dynamic image or static image.Wherein, when judgement is learnt the flashing type back lighting device when playing dynamic image, the check signal is with the activation backlight that glimmers; Otherwise when judgement is learnt the flashing type back lighting device when playing static image, the check signal is with the forbidden energy backlight that glimmers.
Above-mentioned flashing type back lighting device more comprises the light-source brightness balance module, and after the light-source brightness balance module comprises that cycle and brightness control unit are responsible for the scanning signal that will obtain and time pulse signal and are dealt with, output light source work period (duty cycle) signal and brightness (luminance) controlling signal.
Above-mentioned cycle and brightness control unit comprise work period controlling mechanism and brilliance control mechanism.Wherein, the work period when work period controlling mechanism control fluorescent lamp activates is when brilliance control mechanism determines then that the flashing type back lighting device is play static image and the brightness of the fluorescent lamp during dynamic image.
Above-mentioned backlight control module more comprises data latch, and it is responsible for exporting N data frame and N data frame is copied to storage element.
The present invention proposes a kind of method of operating of flashing type back lighting device, its operating process be the image verification unit of flashing type back lighting device according to two continuous data frame, judge whether the present demonstration of flashing type back lighting device is dynamic image.Judge when the image verification unit and to learn when being shown as dynamic image i.e. activation flicker backlight function; Otherwise, when the judgement of image verification unit learns that demonstration is not dynamic image, i.e. forbidden energy flicker backlight function.
Above-mentioned method of operating more comprises the adjustment light-source brightness, judges according to scanning signal and time pulse signal whether the flashing type back lighting device shows is dynamic image.Judge when brilliance control mechanism and to learn and when the flashing type back lighting device is shown as dynamic image, promptly export the brilliance control signal, to heighten light-source brightness; Otherwise, when the demonstration of flashing type back lighting device is not dynamic image, promptly export the brilliance control signal, to turn down light-source brightness.
The present invention is because of adopting the image verification unit, therefore can detect picture when playing to dynamic image, activation flicker backlight, and detecting picture when playing, forbidden energy flicker backlight to static image.
For above and other objects of the present invention, feature and advantage can be become apparent, preferred embodiment cited below particularly, and conjunction with figs. elaborate.
Description of drawings
Fig. 1 is the circuit block diagram of a kind of flashing type back lighting device of a preferred embodiment of the present invention.
Fig. 2 A is the circuit diagram of a kind of work period controlling mechanism of a preferred embodiment of the present invention.
Fig. 2 B is the input and the output waveform figure of a kind of work period controlling mechanism of a preferred embodiment of the present invention.
Fig. 3 is a kind of pixel synoptic diagram of a preferred embodiment of the present invention.
Fig. 4 is the method for operating flow chart of steps of a kind of flashing type back lighting device of a preferred embodiment of the present invention.
100: the flashing type back lighting device
110: the light-source brightness balance module
112: the signal lock unit
114: cycle and brightness control unit
116: the work period controlling mechanism
118: brilliance control mechanism
120: the flicker control module
122: data latch
124: the image verification unit
130: storage element
132: the storage interface controller
134: Storage Media
210: counter
220: offset buffer
S402～s408: each steps flow chart
Embodiment
Please refer to Fig. 1, is the circuit block diagram of a kind of flashing type back lighting device of a preferred embodiment of the present invention, and its feature is included in when detecting dynamic image, activation flicker backlight, and when detecting static image, this flicker backlight of forbidden energy.
In the present embodiment, this flashing type back lighting device 100 comprises light-source brightness balance module 110, flicker control module 120 and storage element 130.
In the present embodiment, flicker control module 120 comprises data latch 122 and image verification unit 124, and this data latch 122 is coupled to storage element 130 and image verification unit 124, and receives the data that data source is supplied with.Wherein, data latch 122 is for receiving the data frame that data source transmitted, and then with its output, and duplicates and aly stores to storage element 130.124 of image verification units according to the dynamic image inspection rule with N data frame being received with after (N-1) data frame that storage element is read is done computing, output check signal.Wherein, N is the positive integer more than or equal to 2.
Please be a kind of pixel synoptic diagram of a preferred embodiment of the present invention simultaneously with reference to Fig. 2.In Fig. 3, the data frame that data latch 122 is sent to image verification unit 124 can be divided into strange pixel and dual pixel, and each pixel (comprising strange pixel and dual pixel) can be divided into three of R (redness), G (green), B (blueness).In the present embodiment, each the strange pixel of the last data frame that dynamic image inspection rule (MotionDetector Algorithm) is read for R, the G of each the strange pixel of the data frame that will obtain now and dual pixel, B and from storage element 130 and R, G, the B of dual pixel do computing, to obtain dynamic image detecting value.Illustrate, when computing be the R of dual pixel the time, its formula can be (RE (N)) (RE (N-1)), wherein, is mutual exclusion or lock, RE (N) is the R of strange pixel in N the data frame, RE (N-1) then is the R of strange pixel in N-1 the data frame.When (RE (N)) (RE (N-1))=1 (being dynamic image detecting value=1), promptly representing RE in flashing type back lighting device 100 present N the data frame is different with RE in N-1 the data frame; Otherwise if when (RE (N)) (RE (N-1))=0 (being dynamic image detecting value=0), promptly representing RE in flashing type back lighting device 100 present N the data frame is identical with RE in N-1 the data frame, but all not as limit.
In preferred embodiment of the present invention, after flashing type back lighting device 100 is done computing to RE, GE, BE, RO, GO, the BO of RE (red dual pixel), the GE (green dual pixel) of N data frame, BE (blue dual pixel), RO (red strange pixel), GO (green strange pixel), BO (blue strange pixel) and N-1 data frame respectively, when dynamic image detecting value and during more than or equal to a certain default value α (representing that shown person is dynamic image), be activation flicker backlight this moment.
Please continue with reference to Fig. 1, in the present embodiment, light-source brightness balance module 110 comprises signal lock unit 112 and cycle and brightness control unit 114, its signal lock unit 112 is coupled to cycle and brightness control unit 114, and reception scanning signal (YDIO) and clock pulse signal (YCLK), and after cycle and brightness control unit 114 be responsible for the scanning signals that will obtain and time pulse signal and deal with, output light source work period (duty cycle) signal and brightness (luminance) controlling signal.Wherein, cycle and brightness control unit 114 comprise work period controlling mechanism 116 and brilliance control mechanism 118.
Please follow with reference to Fig. 2 A and Fig. 2 B, be respectively the circuit diagram of a kind of work period controlling mechanism of a preferred embodiment of the present invention, with the input and the output waveform figure of work period controlling mechanism.In Fig. 2 A, work period controlling mechanism 116 comprises counter 210 and offset buffer 220, and time pulse signal (YCLK) is responsible for supplying with counter 210 and offset buffer 220, and scanning signal (YDIO) also is coupled to counter 210 and offset buffer 220.In Fig. 2 B, time pulse signal (YCLK) is for constantly being supplied to counter 210 and offset buffer 220, when scanning signal (YDIO) sends when for example being N data frame, offset buffer 220 is promptly done computing according to the scanning signal, (when representing flashing type back lighting device 100 to play dynamic image) promptly exports fluorescent lamp activation work controlling signal (light source works period signal) when the scanning signal for example is logic high potential.And its work period (duty cycle)=Ton/Ts, and Ton is the time that fluorescent lamp activates, Ts is the time of N data frame (drop edge) to N+1 data frame (drop edge), the time that Toff then closes for fluorescent lamp.
In preferred embodiment of the present invention, flashing type back lighting device 100 comprises multi-strip scanning line (not illustrating), as is familiar with this operator as can be known, desire to write as image data fashionable, promptly need drive the sweep trace of the image data desiring to write.
When in the present embodiment, 118 decisions of brilliance control mechanism flashing type back lighting devices 100 are in the static image state and the brightness of the fluorescent lamp during the dynamic image state.Wherein, as be familiar with this operator and can know easily, brilliance control mechanism 118 can be transverter (Inverter), controls brightness with size of current, but not as limit.
Please continue with reference to Fig. 1, storage element 130 comprises storage interface controller 132 and Storage Media 134.Storage Media 134 duplicates the data frame that the back is transmitted for storage data door bolt 122, and storage interface controller 132 is coupled to Storage Media, is stored in data frame in the Storage Media 134 for being used for access.
Please follow with reference to Fig. 4, it is the method for operating flow chart of steps of a kind of flashing type back lighting device of a preferred embodiment of the present invention.In the present embodiment, when its method of operating flow process begins (s402) by the image verification unit of flashing type back lighting device according to two continuous data frame, judge whether the present demonstration of flashing type back lighting device is dynamic image (s404).Judge when the image verification unit and to learn when being shown as dynamic image i.e. activation flicker backlight function (s406); Otherwise, when the judgement of image verification unit learns that demonstration is not dynamic image, i.e. forbidden energy flicker backlight function (s408).
In preferred embodiment of the present invention, method of operating more comprises the adjustment light-source brightness, and it is to judge according to scanning signal and time pulse signal whether the flashing type back lighting device shows is dynamic image.Judge when brilliance control mechanism and to learn and when the flashing type back lighting device is shown as dynamic image, promptly export the brilliance control signal, to heighten light-source brightness; Otherwise, when the demonstration of flashing type back lighting device is not dynamic image, promptly export the brilliance control signal, to turn down light-source brightness.
In preferred embodiment of the present invention, as be familiar with this operator and can know easily, fluorescent lamp can be cold cathode fluorescent lamp (Cold Cathode Fluorescent Lamp is called for short CCFL), but not as limit.
Comprehensive the above, flashing type back lighting device of the present invention and its method of operating have following advantage:
(1) flashing type back lighting device of the present invention and its method of operating, whether what can detect present broadcast is dynamic image, to determine whether activation flicker backlight.
(2) flashing type back lighting device of the present invention and its method of operating, the work period of may command fluorescent lamp.
(3) flashing type back lighting device of the present invention and its method of operating can reduce the brightness of picture, and when playing static image, increase the brightness of picture, with the balance picture brightness when playing dynamic image.
Though the present invention with preferred embodiment openly as above, so it is not in order to limiting the present invention, anyly is familiar with this operator, does a little change and retouching without departing from the spirit and scope of the present invention, all belongs to protection scope of the present invention.
Claims (15)
1. flashing type back lighting device is characterized in that: comprising:
One storage element stores at least one (N-1) data frame;
One flicker control module, be coupled to a data source and this storage element, this flicker control module comprises an image verification unit, and according to a dynamic image inspection rule with the N data frame that received with after this (N-1) data frame that this storage element is read is done computing, output one check signal;
Wherein, N is the positive integer more than or equal to 2.
2. flashing type back lighting device according to claim 1 is characterized in that: this dynamic image inspection rule is in order to judge whether this flashing type back lighting device is shown as a dynamic image.
3. flashing type back lighting device according to claim 2 is characterized in that: when judgement learnt that this flashing type back lighting device is shown as this dynamic image, this check signal was with activation one flicker backlight.
4. flashing type back lighting device according to claim 3 is characterized in that: to learn that this flashing type back lighting device shows non-during for this dynamic image when judgement, and this check signal should the flicker backlight with forbidden energy.
5. flashing type back lighting device according to claim 1, it is characterized in that: more comprise a light-source brightness balance module, comprise one-period and brightness control unit, after dealing with in order to the one scan signal that will obtain and a clock pulse signal, export a light source works cycle (duty cycle) signal and a brilliance control signal.
6. flashing type back lighting device according to claim 5 is characterized in that: this cycle and brightness control unit comprise:
One work period controlling mechanism, the work period when activating in order to control a fluorescent lamp;
One brilliance control mechanism, the brightness of this fluorescent lamp when determining that this flashing type back lighting device is shown as a static image and during this dynamic image.
7. flashing type back lighting device according to claim 5 is characterized in that: this light-source brightness balance module more comprises a signal lock unit, is coupled to this cycle and brightness control unit, in order to should scan signal and this time pulse signal synchronization.
8. flashing type back lighting device according to claim 5 is characterized in that: this fluorescent lamp is cold cathode fluorescent lamp (CCFL).
9. flashing type back lighting device according to claim 1 is characterized in that: this light-source brightness balance module more comprises a data latch, is coupled to this image verification unit and this storage element, and a data frame that receives in order to output also is copied to this storage element.
10. flashing type back lighting device according to claim 9 is characterized in that: this storage element comprises:
One Storage Media is in order to store this data frame;
One storage interface controller is coupled to this Storage Media, is stored in this data frame in this Storage Media in order to access.
11. the method for operating of a flashing type back lighting device is characterized in that: comprising:
According to two continuous data frame, judge whether be shown as a dynamic image;
When judging when being shown as this dynamic image i.e. activation one flicker backlight function;
Show non-ly during for this dynamic image when judging, promptly forbidden energy should flicker backlight function.
12. the method for operating of flashing type back lighting device according to claim 11 is characterized in that: more comprise and adjust a light-source brightness.
13. the method for operating of flashing type back lighting device according to claim 12 is characterized in that: adjust this light-source brightness whether determination methods and comprise according to an one scan signal and a clock pulse signal and judge whether this flashing type back lighting device is shown as this dynamic image.
14. the method for operating of flashing type back lighting device according to claim 13 is characterized in that: when this flashing type back lighting device is shown as this dynamic image, promptly export a brilliance control signal, to heighten this light-source brightness.
15. the method for operating of flashing type back lighting device according to claim 14 is characterized in that:, promptly export this brilliance control signal, to turn down this light-source brightness when this flashing type back lighting device shows non-ly during for this dynamic image.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100084906A CN100514146C (en) | 2004-03-12 | 2004-03-12 | Flash backlight device and its operation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100084906A CN100514146C (en) | 2004-03-12 | 2004-03-12 | Flash backlight device and its operation method |
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| Publication Number | Publication Date |
|---|---|
| CN1560679A true CN1560679A (en) | 2005-01-05 |
| CN100514146C CN100514146C (en) | 2009-07-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2004100084906A Expired - Fee Related CN100514146C (en) | 2004-03-12 | 2004-03-12 | Flash backlight device and its operation method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7719511B2 (en) | 2005-11-10 | 2010-05-18 | Industrial Technology Research Institute | Display apparatus with dynamic blinking backlight and control method and device thereof |
| CN101388200B (en) * | 2008-11-07 | 2010-06-09 | 上海广电光电子有限公司 | Liquid crystal display device and driving method thereof |
| CN101216624B (en) * | 2007-01-07 | 2011-12-28 | 三星电子株式会社 | Display apparatus and backlight scanning method thereof |
| CN104616634A (en) * | 2014-03-18 | 2015-05-13 | 友达光电股份有限公司 | Liquid crystal display device and screen flickering method |
-
2004
- 2004-03-12 CN CNB2004100084906A patent/CN100514146C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7719511B2 (en) | 2005-11-10 | 2010-05-18 | Industrial Technology Research Institute | Display apparatus with dynamic blinking backlight and control method and device thereof |
| CN101216624B (en) * | 2007-01-07 | 2011-12-28 | 三星电子株式会社 | Display apparatus and backlight scanning method thereof |
| US8674925B2 (en) | 2007-01-07 | 2014-03-18 | Samsung Electronics Co., Ltd. | Display apparatus and backlight scanning method thereof |
| CN101388200B (en) * | 2008-11-07 | 2010-06-09 | 上海广电光电子有限公司 | Liquid crystal display device and driving method thereof |
| CN104616634A (en) * | 2014-03-18 | 2015-05-13 | 友达光电股份有限公司 | Liquid crystal display device and screen flickering method |
| US10056044B2 (en) | 2014-03-18 | 2018-08-21 | Au Optronics Corporation | Liquid crystal display device and display flickering method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100514146C (en) | 2009-07-15 |
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