CN100489948C - Method and device for removing image fuzzy blur between frames - Google Patents
Method and device for removing image fuzzy blur between frames Download PDFInfo
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- CN100489948C CN100489948C CNB2004100481934A CN200410048193A CN100489948C CN 100489948 C CN100489948 C CN 100489948C CN B2004100481934 A CNB2004100481934 A CN B2004100481934A CN 200410048193 A CN200410048193 A CN 200410048193A CN 100489948 C CN100489948 C CN 100489948C
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Abstract
A device for removing off overlap and fuzzy of image between pictures consists of the first and the second input control line, the first and the second input data line, the first and the second capacitor, output driving voltage line, the first and the second transistor, back light unit and back light voltage input control line. It features that the first and the second capacitors are earthed, the first and the second input control lines are connected to grid driver and the first and second input data lines are connected to data driver.
Description
Technical field
The present invention relates to simulate and remove the fuzzy used method and apparatus of image overlap between picture in the CRT pulsed videograph process, especially relate to remove the overlapping fuzzy used method and apparatus of afterimage between picture in the LCD simulation CRT pulsed videograph process.
Background technology
Because the use of LCD (LCD) device is extensive, from consumption electronic products to computing machine and the application of mobile phone wireless communication, its product category is various, makes that the technical development of LCD is at a tremendous pace.It meets following electronic product constantly towards the development trend of characteristics such as compact, low-power consumption, low heat emission amount, especially lcd technology is enough to overcome tradition or other for example restriction and shortcoming of the display technique of cathode ray tube (CRT) or light emitting diode (LED) at present, and the future of computing machine, communication apparatus and other consumption electronic products use with development in play an important role and have rich potentiality.
The plane display effect of LCD is good than the screen display effect of cathode-ray tube (CRT), and its power consumption is low with heat dissipation capacity more than similar cathode ray tube screen person.
Therefore, think all that generally this kind display can be used as the purposes of portable telephone display, television receiver, show ground or the advertisement display panel of a new generation.
In addition, at present the widely used light emitting diode of institute is aspect many practical applications, owing to itself characteristic is restricted; For example, LED is preferably used in the demonstration of literal, numeral or image static state, shows and can make dynamic picture unlike lcd technology, reaches vivid effect.
At present, produced in a large number, to replace the made TV and the display of CRT of traditional type with TV and display screen that lcd technology is made.Yet, still have TV and the display that waits to overcome with improved shortcoming manufacturing at present lcd technology.
Video picture with CRT, it uses the video picture mode of pulsed (impulse type), by being radiated on the pixel that scribbles fluorescent material, single electron beam launches light, this pixel is (instant) the in a flash emission light of a bit of time during each picture only, and therefore shown image seems to exist hardly the vision overlapping phenomenon between picture.
Yet, the video picture mode of the formula of retaining (hold type) is used in the video picture of LCD owing to the characteristic of LCD material itself, it by optic response that driving voltage that LCD applies is produced (promptly, gray scale response) and show image, yet because the restriction of liquid crystal material self character, its time of developing takies most time of each picture.And when each image changed, its brightness also changed in regular turn with step-by-step system.Therefore, it seems the image overlap of the image that can feel old picture and new picture by the audience, and cause the fuzzy phenomenon that produces so-called " afterimage " (after image) of image contour.
In order to handle and remove the slowly above-mentioned afterimage that causes of LCD display optic response, so that produce the fuzzy phenomenon of image contour, present most LCD TV manufacturer manages " support type " (load type) video picture with LCD display, make false pulse formula (the pseudo impulse type) LCD display that is similar to CRT monitor by a kind of acceleration driving (over drive) technology that is called, its image shows the some that only accounts for image time, that is, show image not for some time during each picture.
It is with the method that a kind of acceleration drives (over drive) liquid crystal to be applied the higher voltage (for example code 200) of more former target setting voltage (for example code 120) that this kind quickens the driving method, and the speed of response of acceleration liquid crystal molecule, quicken to arrive the optic response value of its setting, make that the liquid crystal GTG with the LCD display of this liquid crystal material manufacturing can be reduced to the time that is less than a picture.
Yet, even the LCD display of using this kind to make with the acceleration Driving technique can be contracted to its GTG within the image time, but because the characteristic of liquid crystal material, the generation of its optic response slowly and its disappear also slow, therefore, the shown image of its picture still can't be removed image overlap and the fuzzy phenomenon of the image contour of " image residue " fully.
In order thoroughly to remove " afterimage ", existing at present known technology adopts following three kinds of modes: write black data or black picture (1) excess time behind this screen displayed image; (2) close backlight, for example: the flicker backlight that Hitachi company is delivered (blink light) method; (3) in conjunction with above (1), (2) two kinds of methods: both inserted the black picture and also close with backlight.Below will describe the restriction and the shortcoming of its content in detail.
But, each all has following shortcoming and restriction above-mentioned these three kinds of methods, therefore its effect is bad, and make that " afterimage " the overlapping blooming between shown picture still exists on the LCD Panel: (1) must increase the extra cost and the cost of frequency multiplier or flicker backlight, (2) electromagnetic interference (EMI) that increases this equipment and caused, (3) some liquid crystal material is because itself material factors is slow by bright deepening, fast by secretly brightening, and other liquid crystal materials are fast by bright deepening, slow by secretly brightening.
In order to reach the overlapping fuzzy phenomenon of " afterimage " shown on certain removal LCD Panel, suggestion a kind of " the used method and apparatus of simulation CRT pulsed video picture " in the Taiwan number of patent application 98103825 of the inventor in its separate case application pending trial is with shortcoming and the restriction of avoiding above-mentioned known technology.In this application case, propose a kind of different with known technology be the method and apparatus of main characteristic with scanning black line (black line), this cycle is can adjustment person less than 8.3ms (being equivalent to 120Hz) in its cycle shortening that image can be shown used control potential pulse; And the time of the black input control line that during this cycle, is applied also for can adjustment person, therefore go for the different optical response of various unlike material liquid crystal, to reach the purpose of simulation CRT pulsed video picture really.And, can avoid in the known technology using the expense cost that augments frequency multiplier in addition, with its electromagnetic interference (EMI) that is caused.In addition, six embodiment are proposed in this application case of the inventor, to reach similar effects, the impressive progress of similar techniques and breakthrough in the field for this reason.
Yet some liquid crystal material is slower by the optic response of bright deepening, does not have enough time to arrive at enough low optic response value as yet in above-mentioned black line scan period, and therefore wherein unavoidable minority still can produce a little " afterimage " overlapping fuzzy phenomenon between picture.In order thoroughly to remove this kind phenomenon, reach desirable effect really with LCD simulation CRT video picture, via the inventor's research and development,, will describe in detail following so generation of the present invention is arranged.
Therefore, this case is the extension invention of the Taiwan patent case numbers 98103825 in its inventor's separate case application pending trial, and its purpose is to solve and improves the problem that image overlap blurs between picture in " simulation CRT pulsed videograph process ".To reach " with the video picture of LCD simulation CRT pulsed ", then please refer to the inventor's the content of being somebody's turn to do preceding application case as how scanning the black line mode as for relevant, no longer repeat at this.
Summary of the invention
Therefore, the purpose of this invention is to provide and remove the fuzzy used method and apparatus of image overlap in a kind of CRT of simulation pulsed process, solve restriction and shortcoming with the above-mentioned relevant known technology of improvement, so that the mode of scanning black line to be provided on screen, and cooperate backlight illumination is reduced to the low position standard of appropriateness, liquid crystal optics summation response control during this period is reduced to minimum, with more certain purpose that reaches the video picture of simulation CRT pulsed, can effectively remove the fuzzy phenomenon of image overlap of " afterimage " between picture, and can significantly improve the image display quality of LCD display, and can save extras institute must expense and cost.
For achieving the above object, the invention provides a kind of fuzzy used device of image overlap between picture of in LCD display simulation CRT monitor process, removing.
Removing the fuzzy used device of image overlap in the simulation CRT pulsed videograph process of the present invention comprises:
First input control line; Second input control line; First input data line; Second input data line; The 3rd input data line; The 4th input data line; The 5th input data line; First capacitor; Second capacitor; The 3rd transistor; The 4th transistor; And outputting drive voltage line;
The first transistor comprises: first grid is connected to first input control line, first source electrode is connected to first input data line, and first drain electrode is connected to the drain electrode of outputting drive voltage line and first capacitor and transistor seconds; And transistor seconds, comprise: second grid is connected to second input control line, second source electrode is connected to second input data line, and second drain electrode is connected to drain electrode and second capacitor and the outputting drive voltage line of the first transistor;
Wherein first capacitor and second capacitor are respectively reservior capacitor and liquid crystal equivalent condenser, and ground connection all, and this outputting drive voltage line is that the driving voltage that is used for will simulation using exports the LCD panel pixels to; And the back light unit and the voltage input control line backlight that comprise the adjustment of brightness may command;
This first and second input control line is connected to a gate drivers, and this first and second input data line is connected to the drain electrode of the 3rd and the 4th switching transistor of two parallel connections in addition respectively, the source electrode of these two switching transistors in parallel is connected to a data driver, and its grid respectively is connected to the 3rd and the 4th input data line;
Mistiming between the recurrent pulse waveform of first and second control signal is the mistiming between the n bar input control line of n pulse, and is adjustable; And in black line scan period, when the brightness of this back light unit is reduced to minimum via its control voltage, the liquid crystal summation optic response of this black line scan period can be reduced to minimum, remove overlapping fuzzy purpose of afterimage and effect between shown picture and reach.
The present invention also provides the fuzzy used method of image overlap between picture of removing in a kind of CRT of simulation pulsed videograph process, may further comprise the steps: a circuit is provided, has: first input control line, second input control line, first input data line, second input data line, the 3rd input data line, the 4th input data line, the 5th input data line, the first transistor, transistor seconds, the 3rd transistor, the 4th transistor, first capacitor, second capacitor and outputting drive voltage line;
First control signal that will have the recurrent pulse waveform offers the first transistor grid;
Second control signal that will have the recurrent pulse waveform offers the transistor seconds grid, and second control signal is identical with first control signal except phase delay;
The 5th data-signal is offered the 3rd transistor AND gate the 4th transistorized source electrode in parallel;
Provide the 3rd transistor gate with the 3rd data-signal, and the potential pulse that is produced with its drain electrode offers the source electrode of the first transistor as first data-signal, when the first transistor was triggered by first control signal, this circuit was with first data-signal this outputting drive voltage line of feeding;
Provide the 4th transistor gate with the 4th data-signal, and the voltage pulse signal that is produced with its drain electrode offers the source electrode of transistor seconds as second data-signal, when transistor seconds was triggered by second control signal, this circuit was with second data-signal this outputting drive voltage line of feeding;
To export to pixel by the outputting drive voltage that above step produced, with show image; And in black line scan period, when the brightness of this back light unit is reduced to minimum via its control voltage, the liquid crystal summation optic response of this black line scan period can be reduced to minimum, remove overlapping fuzzy purpose of afterimage and effect between shown picture and reach.
Various characteristics of the present invention and advantage can be by following for the detailed explanations of embodiment, and obtain better understanding with reference to the accompanying drawings.Wherein identical assembly uses identical reference number.
Description of drawings
Fig. 1 is the summary structural drawing according to the display panels of the embodiment of the invention and back light unit;
Fig. 2 a to 2d is the liquid crystal molecule drive voltage pulses V according to the embodiment of the invention
LC, curves such as liquid crystal summation optic response Lq, backlight control voltage BV and backlight illumination response BL waveform relationship figure;
Fig. 3 a be demonstration according to the present invention the 1st embodiment by the pel array that intersection point constituted of a plurality of gate lines and data line and by the synoptic diagram of the driving circuit that a plurality of data driver and a plurality of gate drivers constituted;
Fig. 3 b is that the LCD of the 1st embodiment according to the present invention is quickened drive unit;
Fig. 4 a to 4d is the liquid crystal molecule drive voltage pulses V of the 1st embodiment according to the present invention
LC, curves such as liquid crystal summation optic response Lq, backlight control voltage BV and backlight illumination response BL waveform relationship figure;
Fig. 5 a be demonstration according to the present invention the 2nd embodiment by the pel array that intersection point constituted of a plurality of gate lines and data line and by the synoptic diagram of the driving circuit that a plurality of data driver and a plurality of gate drivers constituted;
Fig. 5 b quickens drive unit according to the LCD of invention the 2nd embodiment;
Fig. 6 a to 6d is the liquid crystal molecule drive voltage pulses V of the 2nd embodiment according to the present invention
LC, curves such as liquid crystal summation optic response Lq, backlight control voltage BV and backlight illumination response BL waveform relationship figure;
Fig. 7 a be demonstration according to the present invention the 3rd embodiment by the pel array that intersection point constituted of a plurality of gate lines and data line and by the synoptic diagram of the driving circuit that a plurality of data driver and a plurality of gate drivers constituted;
Fig. 7 b quickens drive unit according to the LCD of invention the 3rd embodiment;
Fig. 8 a to 8d figure is the liquid crystal molecule drive voltage pulses V of the 3rd embodiment according to the present invention
LC, curves such as liquid crystal summation optic response Lq, backlight control voltage BV and backlight illumination response BL waveform relationship figure;
Fig. 9 a figure shows that according to the present invention the 4th embodiment is by the pel array that intersection point constituted of a plurality of gate lines and data line and by the synoptic diagram of the driving circuit that a plurality of data driver and a plurality of gate drivers constituted;
Fig. 9 b quickens drive unit according to the LCD of invention the 4th embodiment;
Figure 10 a to 10d is the liquid crystal molecule drive voltage pulses V of the 4th embodiment according to the present invention
LC, curves such as liquid crystal summation optic response Lq, backlight control voltage BV and backlight illumination response BL waveform relationship figure;
Figure 11 a be demonstration according to the present invention the 5th embodiment by the pel array that intersection point constituted of a plurality of gate lines and data line and by the synoptic diagram of the driving circuit that a plurality of data driver and a plurality of gate drivers constituted;
Figure 11 b quickens drive unit according to the LCD of invention the 5th and 6 embodiment;
Figure 12 a to 12d is the liquid crystal molecule drive voltage pulses V of the 5th embodiment according to the present invention
LC, curves such as liquid crystal summation optic response Lq, backlight control voltage BV and backlight illumination response BL waveform relationship figure; And
Figure 13 a to 13d is the liquid crystal molecule drive voltage pulses V of the 6th embodiment according to the present invention
LC, curves such as liquid crystal summation optic response Lq, backlight control voltage BV and backlight illumination response BL waveform relationship figure.
Embodiment
Below pass through the design and the principle of operation of description of drawings apparatus of the present invention.At first, please refer to Fig. 1, it is that its demonstration is used for the structure of display panels of the present invention and backlight module according to the display panels of the embodiment of the invention and the synoptic diagram of backlight module.10 is display panels among the figure, the 20th, and back light unit.
Secondly, please refer to Fig. 2 a to d, by the drive voltage pulses V of explanation liquid crystal molecule
LC, backlight control voltage BV, backlight illumination response BL and this liquid crystal summation optic response Lq waveform between relation the design and the principle of operation of apparatus of the present invention are described.
At first, please refer to Fig. 2 a, solid line wherein is for this reason according to liquid crystal drive voltage pulse V that device of the present invention produced
LCWaveform, its unitary code (code) is a kind of voltage unit; Dotted line then shows the waveform that it causes the optic response of liquid crystal molecule, and its unit is nit (nit).Wherein a is the liquid crystal optical response curve point, b is the liquid crystal optical response curve point, liquid crystal molecule optic response squiggle when dotted line (c) is not reduced to enough low level with the brilliance control of the back light unit of this device for known technology, and the liquid crystal molecule optic response squiggle of dotted line (d) when for the present invention the brilliance control of the back light unit of this device being reduced to enough low level, A1-A8 is a time point.Wherein, can find out significantly, via on this indicator screen, scanning black line, and cooperate as shown in following Fig. 2 c, the brightness appropriateness of back light unit is reduced, can make the summation optic response of this liquid crystal molecule be reduced to want enough low position accurate, for example be reduced to the b point of liquid crystal optical response curve of the present invention (d) by a point of the known technology liquid crystal optical response curve (c) of time point A3 in Fig. 2 a, therefore, can eliminate " afterimage " overlapping fuzzy phenomenon between picture N and the N+1, to reach the purpose with the video picture of LCD simulation CRT pulsed really, this is the feature and the emphasis of this case.
Again secondly, please refer to Fig. 2 b, it is the curve of backlight control voltage (BV), and its unit is a volt (V), wherein BV1 is a display when normal video picture to the control magnitude of voltage that back light unit applied, and the voltage that BV0 is applied when to be desire reduce this backlight unit brightness response.This back light unit can also can be point (point) light source for line (line) light source, and the visible liquid crystal material optic response desiring to reach and video picture and the effect of removing afterimage suitably select following a kind of material to make: the cold fluorescent tube of negative electrode (CCFL), light emitting diode (LED), Organic Light Emitting Diode (OLED), polymer LED (PLED) and electroluminor (EL).
Fig. 2 c is the response curve of the brightness (BL) of back light unit, its unit is brightness (luminance), employed backlight illumination response when wherein BL1 is normal video picture, that is the backlight illumination response that in Fig. 2 b, when this back light unit being applied control voltage BV1, is produced, and BL0 to be desire remove screen display afterimage between picture, and the backlight illumination response when cooperating the scanning black line that backlight illumination is reduced.The cited case is to use cold cathode fluorescent tube (CCFL) among Fig. 2 c, so its luminosity response value is in the shape of the letter V, and must just can arrive at the value of minimum point e through a period of time.Therefore, its luminosity response presentative time delay phenomenon significantly.Yet if use light emitting diode (comprising: LED, OLED, PLED) or electroluminor (EL), the luminosity response of this back light unit is for arriving at desired value mode response curve immediately, and its shape is as the deep-well shape shown in Fig. 2 d; And its shape that is applied in the curve of backlight control voltage also is the deep-well shape as Fig. 2 b.
In sum, the dotted line of Fig. 2 a (c) is curve (c) for the inventor adopts the liquid crystal optical response that is produced in scanning black line mode in above-mentioned separate case application is waited to try a case, and the present invention design the luminosity response of back light unit is reduced to the liquid crystal optical response that minimum causes is curve (d): and the liquid crystal molecule optic response that a among Fig. 2 a order is added that the backlight illumination that e is ordered among Fig. 2 c responds, and can produce the liquid crystal summation optic response that b is ordered among Fig. 2 a.This is implements the minimum liquid crystal summation optic response that method and apparatus of the present invention caused, quality that it can desire to reach according to the actual video picture of liquid crystal and effect and design to enough low position are accurately removed on the screen the overlapping fuzzy purpose of afterimage between picture to reach really.
In addition, another key character of the present invention is can adjust control by control to the length during the voltage that back light unit applies:
(1) starting point of this backlight unit brightness response minimum;
(2) time width (that is length) of this backlight unit brightness response minimum;
(3) minimum of this backlight unit brightness response, that is, its luminosity response reduces and the degree of depth that reduces; And therefore caused
(4) the initial time point of this liquid crystal summation optic response minimum,
(5) time width of this liquid crystal summation optic response minimum, and
(6) the reduction degree of depth of this liquid crystal summation optic response minimum.
Must emphasize again that at this minimum of adjusting the summation optic response of the liquid crystal molecule that control procedure produced through above-mentioned backlight illumination is not limited to take place at certain time point of its response curve.It can adjust the backlight illumination width of response minimum institute's duration by the length of controlling this voltage backlight institute application time, and make this liquid crystal molecule optic response minimum continue one section of experience adjustable during (interval) (as being same as shown in Fig. 2 a: the part horizontal linear line segment those shown between the time point A3 to A4 and between the time point A6 to A7), can reach really and remove " afterimage " overlapping fuzzy purpose and effect between picture.Therefore, with the minimum point of time point explanation backlight illumination response, just understand with convenient for the purpose of simplifying the description among above-mentioned Fig. 2 c.
In addition, with the back light unit of LED or EL manufacturing is that the advantage that back light unit was had is with the cold fluorescent tube of negative electrode (CCFL): its luminosity response is desired value pattern immediately, it is after applying control voltage to this back light unit, can arrive at its specified luma target response immediately, shown in Fig. 2 d; Backlight module with a kind of LED or the manufacturing of EL material can have a plurality of specified desired values that increase progressively continuously, can be used in different designs.Yet relative, as back light unit, its luminosity response comparatively slowly is progressive desired value pattern with CCFL, shown in Fig. 2 c, after this back light unit being applied control voltage, must experience a period of time and just can arrive at its specified luma target response.Therefore, it is less for the contribution that reduces liquid crystal summation optic response minimum time width, and has only a target ratings available with the luminosity response of a kind of CCFL of material manufacturing usually.
Remove other variation and the form of implementation that image overlap blurs used device between picture in the simulation CRT pulsed videograph process used in the present invention, will be in following detailed description.
Below with reference to the description of drawings embodiments of the invention.In following examples, mainly be to be instrument with the waveform that shows, to describe its characteristic and behavior, in view of the above so that advantage of the present invention and characteristics to be described to voltage that liquid crystal molecule and back light unit were applied and liquid crystal molecule optic response and backlight unit brightness response.
Transverse axis among Fig. 4,6,8,10,12 and 13 in following six embodiment is the time, and its unit is ms, the time point of A1 to A7 for carrying out according to time sequencing, its longitudinal axis be liquid crystal drive voltage with sign indicating number (code) as the unit of display.For convenience of description, in above-mentioned each figure, be that unit is divided into image time intervals (partition) such as (N-1), N, (N+1), (N+2) be individual with image time (frame time) with this time, and the dotted line among Fig. 4 a, 6a, 8a, 10a, 12a and the 13a represents liquid crystal molecule at optic response (that is gray scale response) the path characteristics curve that is subjected to applying under the different driving voltage respectively.The brightness (luminance) that liquid crystal presented for this reason usually of this optic response, its unit is a nit (candela/metre2: cd/m
2).
Below respectively with the liquid crystal drive voltage pulse V of the circuit diagram shown in six embodiment, LCD controller pixel cell
LC, backlight control voltage BV, backlight illumination response BL and this liquid crystal summation optic response Lq squiggle between relation apparatus and method of the present invention are described.
Because emphasis of the present invention and purpose are to provide a kind of " removing the fuzzy used method and apparatus of image overlap between picture in the simulation CRT pulsed process ", therefore, mainly are explanation liquid crystal drive voltage pulse V in the wave form analysis of various embodiments of the present invention
LC, backlight control voltage BV, backlight illumination response BL and this liquid crystal summation optic response Lq etc. waveform between relation.If reader's desire is understood the control potential pulse G that this CRT simulator is produced
1, G
1With drive voltage pulses D
1, D
1, V
LCWaveform between relation, please refer to the Taiwan patent No. 98103825 in inventor's separate case application pending trial, therefore, its content no longer repeats at this.
In addition, should emphasize at this that employed back lighting device is to be example explanation with the cold fluorescent tube of negative electrode (CCFL) in various embodiments of the present invention, its optic response is the progressive desired value pattern of forming V-shape, and the presentative time delay phenomenon.Yet the present invention also can use the back lighting device of making as material with LED, OLED, PLED or EL, and can reach the purpose and the effect of " remove in the simulation CRT pulsed process between picture image overlap fuzzy " equally.But it should be noted that the luminosity response with the back lighting device of this material manufacturing is the pattern of desired value immediately of deep-well shape (please refer to Fig. 2 d) that takes the shape of the letter U.Therefore, though be that example person is slightly different very similar with CCFL among following each embodiment of the curve shape of its summation liquid crystal optical response and the present invention.Be to be that back lighting device is done wave form analysis with CCFL in this manual, as for detailed content and details about the wave form analysis of the summation liquid crystal optical response curve that caused with LED, OLED, PLED or the made back lighting device of EL producing, the reader can derive easily according to the wave form analysis among above explanation and following each embodiment and learn.Therefore, in this not explanation one by one, to avoid making this wave form analysis seem too complicated unnecessaryly.
Below with reference to Fig. 1, Fig. 3 a, b and Fig. 4 a to d the 1st embodiment of the present invention is described.
At first, please refer to Fig. 1, it shows the display panels that according to the present invention the 1st embodiment is used and the configuration structure of back light unit.
Fig. 3 a for according to present embodiment by the pel array that intersection point constituted of a plurality of gate lines and data line and by analog drive circuit that a plurality of data driver and a plurality of gate drivers constituted.
Fig. 3 b is the analog-driven device according to the LCD of present embodiment.Fig. 3 b is the enlarged drawing that indicates the 3b place among Fig. 3 a.
Fig. 4 a to 4d is the liquid crystal drive voltage pulse V that the analog-driven device of Fig. 3 a, the b of present embodiment is produced
LC, the relation between curve waveform such as liquid crystal summation optic response Lq, backlight control voltage BV and backlight illumination response BL.
The fuzzy image removal device
By Fig. 3 a, b as can be known, this analogue means comprises:
The first input control line G
1The second input control line G
1'; The first input data line D
1The second input data line D
1'; The first capacitor C
SThe second capacitor C
LSThe outputting drive voltage line;
The first transistor Q comprises: first grid is connected to the first input control line G
1, first source electrode is connected to the first input data line D
1, and first drain electrode is connected to the outputting drive voltage line and the first capacitor C
SAnd the drain electrode of transistor seconds Q '; And
Transistor seconds Q ' comprises: second grid is connected to the second input control line G
1', second source electrode is connected to the second input data line D
1', and second drain electrode is connected to the drain electrode and the second capacitor C of the first transistor
LCAnd outputting drive voltage line;
Wherein first capacitor and second capacitor respectively are reservior capacitor and liquid crystal equivalent condenser, and ground connection all, and this outputting drive voltage line is to be used for exporting the driving voltage that this simulation is used this pixel of LCD panel to show image; And the back light unit and the voltage input control line backlight that comprise the adjustment of brightness may command;
It is characterized by
First and second input control line is connected to gate drivers, and first and second input data line respectively is connected to data driver; And
In this black line scan period, when the brightness of this back light unit is reduced to minimum via its control voltage, the liquid crystal summation optic response of this time durations can be reduced to minimum, remove overlapping fuzzy purpose of afterimage and effect between shown picture and reach.
Fuzzy image removal method
Be the driving method of the analogue means of the 1st embodiment below, may further comprise the steps according to the present invention:
The first control signal G that will have the recurrent pulse waveform
1Offer the first grid of the first transistor Q of this circuit;
The second control signal G that will have the recurrent pulse waveform
1Offer the second grid of the transistor seconds Q ' of this circuit;
The second control signal G
1Except phase delay, with the first control signal G
1Identical;
With the first data-signal D
1Offer the source electrode of this circuit the first transistor Q, when by the first control signal G
1During triggering, this circuit is with the first data-signal D
1This outputting drive voltage line of feeding;
With the second data-signal D
1Offer the source electrode of this circuit transistor seconds Q ', when by the second control signal G
1During triggering, this circuit is with the second data-signal D
1This outputting drive voltage line of feeding; And
To export to this pixel with show image by this outputting drive voltage that above step produced; And
In this black line scan period, when the brightness of this back light unit is reduced to minimum via its control voltage, the liquid crystal summation optic response of this time durations can be reduced to minimum, remove overlapping fuzzy purpose of afterimage and effect between shown picture and reach.
Wave form analysis
Describe the liquid crystal drive voltage pulse V that analogue means produced of Fig. 3 a, the b of the 1st embodiment according to the present invention in detail below with reference to Fig. 4 a to 4d
LC, the relation between waveform such as liquid crystal summation optic response Lq, backlight control voltage BV and backlight illumination response BL.
In the following discussion, driving voltage V
1, V
2, V
3Can be considered a kind of magnitude of voltage with sign indicating number (code) expression.
Must emphasize once again at this, this driving voltage can reach its target voltage in moment when applying, yet liquid crystal molecule be subjected to must just can reach its objective optics response position through response after a while after the voltage that applies, this is because due to the material behavior of liquid crystal itself.
Owing to all use alternating current (AC) as driving voltage usually, therefore, in its control and driving process, have the phenomenon that positive-negative phase alternately occurs, i.e. drive voltage pulses V to liquid crystal
LCWaveform with respect to reference voltage V
COMHave the phenomenon that positive-negative phase alternately occurs.
This waveform is to repeat according to the circulation of the time sequencing of time point A1 to A7 with the following methods: at time point A
1Drive voltage pulses V in N-1 the picture before
LCValue V
1' (code0) be negative polarity; The value of backlight control voltage BV is BV0, and the value of backlight illumination response BL is BL0, and the liquid crystal response 1 summation optic response value of this moment is liquid crystal response 1 (Lq1);
And at time point A
1Begin to enter N picture, at this moment drive voltage pulses V
LCValue rise to V
2(code 32), and be positive polarity, and be retained to time point A always
2Till, this moment, backlight control voltage BV rose to BV1, and the value of backlight illumination response BL rises to BL1 gradually from BL0, till the liquid crystal summation optic response value of this moment rises to the liquid crystal response 2 (Lq2) of time point A2 gradually from the Lq1 of time point A1;
Time proceeds to time point A2 then, at this moment drive voltage pulses V
LCValue drop to V1 (code 0) from V2 (code 32), and be positive polarity, and the value of backlight control voltage BV still remains on BV1, the value of backlight illumination response BL also remains on BL1, and the Lq2 of summation liquid crystal optical response value during from time point A2 begins to descend, till the value Lq1 when arriving time point A4 via time point A3;
Time proceeds to time point A3 then, at this moment drive voltage pulses V
LCValue still keep V1 (code 0), and be positive polarity, this moment, the value of backlight control voltage BV dropped to BV0, and the value of backlight illumination response BL continues to drop to gradually the BL0 of time point A4 from the BL1 of time point A3, and this summation liquid crystal optical response value drops to Lq1 one after a while till time point A4;
Time proceeds to time point A4 and begins to enter N+1 picture then, this moment drive voltage pulses V
LCValue drop to V3 ' (code 120) from V1 (code 0), and be negative polarity, the value of backlight control voltage BV rises to BV1, and the value of backlight illumination response BL begins to rise to gradually BL1, and till the value Lq3 of liquid crystal summation optic response value when time point A4 begins to rise to time point A5 gradually;
Time proceeds to time point A5 then, at this moment drive voltage pulses V
LCValue rise to V1 ' (code 0), and be negative polarity, this moment, the value of backlight control voltage BV still kept BV1, and the value of backlight illumination response BL also keeps BL1, this summation liquid crystal optical response value continues to descend via time point A6, drops to Lq1 after a while, continues to then till the time point A7;
Time proceeds to time point A6 then, at this moment drive voltage pulses V
LCValue still keep V1 ' (code 0), and be negative polarity, this moment backlight control voltage BV value drop to BV0 and be retained to time point A7 always from BV1 till, the value of backlight illumination response BL continues to drop to gradually the BL0 of time point A7 from the BL1 of time point A6, and this liquid crystal summation optic response value drops to Lq1 after a while and continues to till the time point A7 always;
Time proceeds to time point A7 and begins to enter N+2 picture then, at this picture drive potential pulse V
LC, backlight control voltage BV, backlight illumination response BL and this liquid crystal summation optic response Lq etc. wave form varies and N+1 picture during time point A4-A7 between the variation of this waveform identical, therefore, no longer repeat at this.As for the variation of above-mentioned each waveform during each picture after the N+2 picture, all can derive easily and learn according to above explanation.
Liquid crystal optical response family curve when dotted line shown in Fig. 4 a drives for implementing simulation CRT video picture.As the outputting drive voltage V of this device between each time point in this figure
LCDuring for (code0), can reach with known technology in the enterprising line scanning black line of display screen (black line) during promptly being illustrated between this moment and between picture, insert the identical effect of black picture.In addition, the present invention's design moderately reduces the brightness of back light unit, so that its liquid crystal summation optic response value Lq minimizes, to guarantee to eliminate " afterimage " overlapping fuzzy phenomenon between picture.And reach purpose really with the video picture of LCD display simulation CRT monitor pulsed.This is better than the characteristics of the maximum of known technology for the present invention.
Below with reference to Fig. 1, Fig. 5 a, b and Fig. 6 a to d the 2nd embodiment of the present invention is described.
At first, please refer to Fig. 1, it shows the display panels that according to the present invention the 2nd embodiment is used and the configuration structure of back light unit.
Fig. 5 a is by the pel array that intersection point constituted of a plurality of gate lines and data line and by analog drive circuit that a plurality of data driver and a plurality of gate drivers constituted according to present embodiment.
Fig. 5 b is the LCD analog-driven device according to present embodiment.Fig. 5 b is the enlarged drawing that indicates the 5b place among Fig. 5 a.
Fig. 6 b is the LCD analog-driven device according to present embodiment.
Fig. 6 a to 6d is the liquid crystal drive voltage pulse V that the analog-driven device of Fig. 5 a, the b of present embodiment is produced
LC, the relation between curve waveform such as liquid crystal summation optic response Lq, backlight control voltage BV and backlight illumination response BL.
DS is an input data line among the figure, G
1Be input control line, G
2Be input control line, G
2Be input control line, G
mBe input control line, G
M+1Be input control line, G
2mBe input control line, G
2m+1Be input control line, G
3mBe input control line, Lq3 is a liquid crystal response 3, V
LCBe outputting drive voltage, V
COMIt is reference voltage.
The fuzzy image removal device
By figure 5a, b as can be known, this LCD acceleration drive unit comprises:
The first input control line G
1The second input control line G
1'; The first input data line D
1The second input data line D
1'; The 3rd input data line D '; The 4th input data line D; The 5th input data line D
sThe first capacitor C
SThe second capacitor C
LCThe 3rd transistor Q3; The 4th transistor Q4; And outputting drive voltage line;
The first transistor Q comprises: first grid is connected to the first input control line G
1, first source electrode is connected to the first input data line D
1, and first drain electrode is connected to the outputting drive voltage line and the first capacitor C
SAnd the drain electrode of transistor seconds Q '; And
Transistor seconds Q ' comprises: second grid is connected to the second input control line G
1, second source electrode is connected to the second input data line D
1', and second drain electrode is connected to the drain electrode and the second capacitor C of the first transistor
LCAnd input drive voltage line;
Wherein first capacitor and second capacitor respectively are reservior capacitor and liquid crystal equivalent condenser, and ground connection all, and this outputting drive voltage line is this pixel that is used for the driving voltage that this simulation is used is exported to the LCD panel; And
Comprise back light unit and voltage input control line backlight that the brightness may command is adjusted;
It is characterized by this first and second input control line G
1, G
1Be connected to a gate drivers, and this first and second input data line D
1, D
1' being connected to the switching transistor Q3 of two parallel connections in addition, the drain electrode of Q4 respectively, the source electrode of these two switching transistors in parallel is connected to a data driver, and its grid respectively is connected to the 3rd and the 4th input data line D ', D; And first and second control signal G
1, G
1The recurrent pulse waveform between mistiming be mistiming between the n bar input control line of n pulse, and be adjustable; And
In this black line scan period, when the brightness of this back light unit is reduced to minimum via its control voltage, the liquid crystal summation optic response of this time durations can be reduced to minimum, remove overlapping fuzzy purpose of afterimage and effect between shown picture and reach.
Fuzzy image removal method
Below be according to the driving method of the LCD analog-driven device of the 2nd embodiment of the present invention, may further comprise the steps:
The first control signal G that will have the recurrent pulse waveform
1Offer the first transistor grid;
The second control signal G that will have the recurrent pulse waveform
1' offering the transistor seconds grid, second control signal is identical with first control signal except phase delay;
The 5th data-signal Ds is offered the 3rd transistor Q3 of this parallel connection and the source electrode of the 4th transistor Q4;
The 3rd data-signal D ' is offered the grid of the 3rd transistor Q3, and offer the source electrode of the first transistor Q1 as the first data-signal D with its potential pulse that is produced that drains
1, when the first transistor Q1 by the first control signal G
1During triggering, this circuit is with the first data-signal D
1This outputting drive voltage line of feeding;
The 4th data-signal D is offered the grid of the 4th transistor Q4, and offer the source electrode of transistor seconds Q ' as the second data-signal D with its voltage pulse signal that is produced that drains
1, when transistor seconds Q ' by the second control signal G
1During triggering, this circuit is with the second data-signal D
1This outputting drive voltage line of feeding; And
To export to this pixel with show image by this outputting drive voltage that above step produced; And
In this black line scan period, when the brightness of this back light unit is reduced to minimum via its control voltage, the liquid crystal summation optic response of this time durations can be reduced to minimum, remove overlapping fuzzy purpose of afterimage and effect between shown picture and reach.
Wave form analysis
Describe the liquid crystal drive voltage pulse V that analogue means produced of Fig. 5 a, the b of the 2nd embodiment according to the present invention in detail below with reference to Fig. 6 a to 6d
LC, the relation between waveform such as liquid crystal summation optic response Lq, backlight control voltage BV and backlight illumination response BL.
Because identical among the description explanation that the waveform of relevant present embodiment carries out process and the 1st embodiment, the content that therefore please refer to " wave form analysis " part of the 1st embodiment can obtain abundant understanding, in this no longer repeat specification.
Liquid crystal optical response family curve when dotted line shown in Fig. 6 a drives for implementing simulation CRT video picture.As this device outputting drive voltage V between each time point in this figure
LCDuring for (code 0), promptly be illustrated in this moment between during at the enterprising line scanning black line of display screen (black line), it can reach with known technology and insert the identical effect of black picture between picture.In addition, the present invention's design moderately reduces the brightness of back light unit, so that its summation liquid crystal optical response value Lq minimizes, guaranteeing to eliminate " afterimage " overlapping fuzzy phenomenon between picture, and reach purpose really with the video picture of LCD display simulation CRT monitor pulsed.This is the maximum characteristics that the present invention is better than known technology.
For convenience of description with understand for the purpose of, the drive voltage pulses V that analogue means was exported shown in present embodiment was above
LC, curve such as liquid crystal summation optic response Lq, backlight control voltage BV and backlight illumination response BL waveform identical with embodiment 1, to avoid in declarative procedure, causing too complicated elusive situation; But can according to actual demand this Waveform Design be become to have the waveform of various variations by the deviser.
Below with reference to Fig. 1, Fig. 7 a, b and Fig. 8 a to d the 3rd embodiment of the present invention is described.
At first, please refer to Fig. 1, it shows the display panels that according to the present invention the 3rd embodiment is used and the configuration structure of back light unit.
Fig. 7 a is by the pel array that intersection point constituted of a plurality of gate lines and data line and by analog drive circuit that a plurality of data driver and a plurality of gate drivers constituted according to present embodiment.
Fig. 7 b is the LCD analog-driven device according to present embodiment.Fig. 7 b is the enlarged drawing that indicates the 7b place among Fig. 7 a.
Fig. 8 a to 8d is the liquid crystal drive voltage pulse V that the analog-driven device of Fig. 7 a, the b of present embodiment is produced
LC, the relation between curve waveforms such as backlight control voltage BV, backlight illumination response BL and this liquid crystal summation optic response Lq.
The fuzzy image removal device
By Fig. 7 a, b as can be known, LCD acceleration drive unit comprises:
The first input control line G
1The second input control line G
1'; The first input data line D; The first capacitor C
SThe second capacitor C
LSThe outputting drive voltage line;
The first transistor Q comprises: first grid is connected to the first input control line G
1, first source electrode is connected to the first input data line D
1, and first drain electrode is connected to the outputting drive voltage line and the first capacitor C
SAnd second drain electrode of transistor seconds Q '; And
Transistor seconds Q ' comprises: second grid is connected to the second input control line G
1', second source ground, and second drain electrode is connected to the drain electrode and the second capacitor C of the first transistor
LCAnd outputting drive voltage line;
Wherein first capacitor and second capacitor respectively are reservior capacitor and liquid crystal equivalent condenser, and ground connection all, and this outputting drive voltage line is to be used for exporting the driving voltage that this simulation is used this pixel of LCD panel to show image; And
Comprise back light unit and voltage input control line backlight that the brightness may command is adjusted;
It is characterized by
First and second input control line is connected to gate drivers, and first input data line is connected to data driver;
The time difference between the recurrent pulse waveform of first and second control signal is the mistiming between the n bar input control line of n pulse, and is adjustable; And
In this black line scan period, when the brightness of this back light unit is reduced to minimum via its control voltage, the liquid crystal summation optic response of this time durations can be reduced to minimum, remove overlapping fuzzy purpose of afterimage and effect between shown picture and reach.
Fuzzy image removal method
Be the driving method of the analogue means of the 3rd embodiment below, may further comprise the steps according to the present invention:
The first control signal G that will have the recurrent pulse waveform
1Offer the first grid of this circuit the first transistor Q;
The second control signal G that will have the recurrent pulse waveform
1' offer the second grid of this circuit transistor seconds Q ',
The second control signal G
1' except phase delay with the first control signal G
1Identical;
With the first data-signal D
1Offer the source electrode of this circuit the first transistor Q, when by the first control signal G
1During triggering, this circuit is with the first data-signal D
1This outputting drive voltage line of feeding;
When by the second control signal G
1During triggering, this circuit is with earthing potential (code 0) this outputting drive voltage line of feeding;
To export to this pixel with show image by this outputting drive voltage that above step produced; And
In this black line scan period, when the brightness of this back light unit is reduced to minimum via its control voltage, the liquid crystal summation optic response of this time durations can be reduced to minimum, remove overlapping fuzzy purpose of afterimage and effect between shown picture and reach.
Wave form analysis
Describe the liquid crystal drive voltage pulse V that analogue means produced of Fig. 7 a, the b of the 3rd embodiment according to the present invention in detail below with reference to Fig. 8 a to 8d
LC, the relation between waveform such as liquid crystal summation optic response Lq, backlight control voltage BV and backlight illumination response BL.
Because identical among the description explanation that the waveform of relevant present embodiment carries out process and the 1st embodiment, the content that therefore please refer to " wave form analysis " part of the 1st embodiment can obtain abundant understanding, in this no longer repeat specification.
Liquid crystal optical response family curve when dotted line shown in Fig. 8 a drives for implementing simulation CRT video picture.As the outputting drive voltage V of this device between each time point in this figure
LCDuring for (code 0), promptly be illustrated in this moment between during in the enterprising line scanning black line of display screen (black line), it can reach with known technology and insert the identical effect of black picture between picture.In addition, the present invention's design moderately reduces the brightness of back light unit, so that its summation liquid crystal optical response value Lq minimizes, guaranteeing to eliminate " afterimage " overlapping fuzzy phenomenon between picture, and reach purpose really with the simulation CRT monitor pulsed video picture of LCD display.This is the maximum characteristics that the present invention is better than known technology.
For convenience of description with understand for the purpose of, the drive voltage pulses V that analogue means was exported shown in present embodiment was above
LC, curve such as liquid crystal summation optic response Lq, backlight control voltage BV and backlight illumination response BL waveform identical with embodiment 1, to avoid in declarative procedure, causing too complicated elusive situation; But can according to actual demand this Waveform Design be become to have the waveform of various variations by the deviser.
Below with reference to Fig. 1, Fig. 9 a, b and Figure 10 a to d the 4th embodiment of the present invention is described.
At first, please refer to Fig. 1, it shows the display panels that according to the present invention the 4th embodiment is used and the configuration structure of back light unit.
Fig. 9 a is by the pel array that intersection point constituted of a plurality of gate lines and data line and by analog drive circuit that a plurality of data driver and a plurality of gate drivers constituted according to present embodiment.
Fig. 9 b is the LCD analog-driven device according to present embodiment.Fig. 9 b is the enlarged drawing that indicates the 9b place among Fig. 9 a.
Figure 10 a to d is the liquid crystal drive voltage pulse V that the analog-driven device of Fig. 9 a, the b of present embodiment is produced
LC, the relation between curve waveform such as liquid crystal summation optic response Lq, backlight control voltage BV and backlight illumination response BL.
The fuzzy image removal device
By Fig. 9 a, b as can be known, LCD acceleration drive unit comprises:
The first input control line G
1The second input control line G
mThe first input data line D
1The first capacitor C
SThe second capacitor C
LSAnd outputting drive voltage line; And
The first transistor Q1 comprises: grid is connected to the first input control line G
1Or the second input control line G
m, source electrode is connected to input data line D
1And drain electrode is connected to the outputting drive voltage line capacitor C in parallel with two
S, C
LCAnd
Wherein first capacitor and each ground connection of second capacitor, this outputting drive voltage line is to be used for exporting this analog drive voltage this pixel of LCD panel to show image; And
Comprise back light unit and voltage input control line backlight that the brightness may command is adjusted;
It is characterized by
This input data line is connected to a data driver, this input control line is connected to gate drivers, this gate drivers has output and starts (OE:output enable) incoming line and open beginning horizontal pulse (STH:start pulse horizontal) incoming line, and receive coherent signal via these incoming lines, to produce the locking control voltage pulse G of this input control line
1, Gm is supplied to transistorized grid via first and second input control line, and the drive voltage pulses V that produces via its control
LCCan on display screen, produce two synchronous input control lines of the m bar input control line of being separated by simultaneously, with show image; And
In this black line scan period, when the brightness of this back light unit is reduced to minimum via its control voltage, the liquid crystal summation optic response of this time durations can be reduced to minimum, remove overlapping fuzzy purpose of afterimage and effect between shown picture and reach.
Fuzzy image removal method
Below be the driving method of the LCD acceleration drive unit of the 4th embodiment according to the present invention, may further comprise the steps:
To have recurrent pulse waveform data signal D
1Offer the source electrode of the first transistor Q1;
Provide OE and STH control signal to this gate drivers, so that produce synchronous control signal G by this gate drivers
1, Gm, offer the grid of this transistor Q1 via first and second input control line;
When by this synchronous control signal G
1, when Gm triggers, this circuit is with this data-signal this outputting drive voltage line of feeding; And will export to this pixel by this outputting drive voltage that above step produced, with show image; And
In this black line scan period, when the brightness of this back light unit is reduced to minimum via its control voltage, the liquid crystal summation optic response of this time durations can be reduced to minimum, remove overlapping fuzzy purpose of afterimage and effect between shown picture and reach.
Wave form analysis
Describe the liquid crystal drive voltage pulse V that analogue means produced of Fig. 9 a, the b of the 4th embodiment according to the present invention in detail below with reference to Figure 10 a to 10d
LC, the relation between waveform such as liquid crystal summation optic response Lq, backlight control voltage BV and backlight illumination response BL.
Because identical among the description explanation that the waveform of relevant present embodiment carries out process and the 1st embodiment, the content that therefore please refer to " wave form analysis " part of the 1st embodiment can obtain abundant understanding, in this no longer repeat specification.
Liquid crystal optical response family curve when dotted line shown in Figure 10 a drives for implementing simulation CRT video picture.As the outputting drive voltage V of this device between each time point in this figure
LCDuring for (code 0), promptly be illustrated in this moment between during in the enterprising line scanning black line of display screen (black line), it can reach with known technology and insert the identical effect of black picture between picture.In addition, the present invention's design moderately reduces the brightness of back light unit, so that its summation liquid crystal optical response value Lq minimizes, guaranteeing to eliminate " afterimage " overlapping fuzzy phenomenon between picture, and reach purpose really with the video picture of LCD display simulation CRT monitor pulsed.This is the maximum characteristics that the present invention is better than known technology.
For convenience of description with understand for the purpose of, the drive voltage pulses V that analogue means was exported shown in present embodiment was above
LC, curve such as liquid crystal summation optic response Lq, backlight control voltage BV and backlight illumination response BL waveform identical with embodiment 1, to avoid in declarative procedure, causing too complicated elusive situation; But can according to actual demand this Waveform Design be become to have the waveform of various variations by the deviser.
Below with reference to Figure 11 a, b and Figure 12 a to d the 5th embodiment of the present invention is described.The device of the 5th embodiment and following illustrated the 6th embodiment all uses Figure 11 a, the b explanation, and its purpose is to show identical device, but can reach different imaging results with different control methods on display screen, relevant situation will be in following explanation.
Please refer to Fig. 1, Figure 11 a, b and Figure 12 a to d the 5th embodiment of the present invention is described.
At first, please refer to Fig. 1, it shows the display panels that according to the present invention the 5th embodiment is used and the configuration structure of back light unit.
Figure 11 a is by the pel array that intersection point constituted of a plurality of gate lines and data line and by analog drive circuit that a plurality of data driver and a plurality of gate drivers constituted according to present embodiment.
Figure 11 b is the LCD analog-driven device according to present embodiment.Figure 11 b is the enlarged drawing that indicates the 11b place among Figure 11 a.
Figure 12 a to 12d is the liquid crystal drive voltage pulse V that the analog-driven device of Figure 11 a, the b of present embodiment is produced
LC, the relation between curve waveform such as liquid crystal summation optic response Lq, backlight control voltage BV and backlight illumination response BL.
The fuzzy image removal device
By Figure 11 a, b as can be known, LCD acceleration drive unit comprises:
The first input control line G
1The second input control line G
M+1The 3rd input control line G
2m+1The first input data line D
1The first capacitor C
SThe second capacitor C
LCAnd outputting drive voltage line; And
The first transistor Q1 comprises: a grid is connected to first input control line or second input control line or the 3rd input control line, one source pole is connected to the first input data line D
1, and one the drain electrode be connected to the outputting drive voltage line in parallel with two and capacitor C
S, C
LC
Wherein first capacitor and second capacitor respectively are respectively reservior capacitor and liquid crystal equivalent condenser, and ground connection all, and this outputting drive voltage line is to be used for exporting this Simulation drive voltage this pixel of LCD panel to show image; And
Comprise back light unit and voltage input control line backlight that the brightness may command is adjusted;
It is characterized by
This input data line is connected to a data driver, this input control line is connected to gate drivers, this gate drivers has first, second and the 3rd output starts (OE) incoming line and opens beginning horizontal pulse (STH) incoming line, and receive coherent signal through incoming line thus, it is to control in this way that the output of being imported of this gate drivers starts (OE) signal, so that produce two groups of synchronous control potential pulses in the output of this gate drivers, it is selected by following three groups of control potential pulses: (1) (G
1, G
m), (2) (G
M+1, G
2m), (3) (G
2m+1, G
3m), and with selected and be combined into two groups controls of the configuration potential pulses (1 of these three groups control potential pulses, 3) or (1,2) or (2,3) be supplied to this transistorized grid with the cycle alternation pattern via its pairing first, second or the 3rd input control line, and control and the drive voltage pulses V that produces via it
LCCan drive pixel produces the 2m bar input control line of being separated by simultaneously with the cycle alternation pattern on display screen two synchronous input control lines, with show image; And
In this black line scan period, when the brightness of this back light unit is reduced to minimum via its control voltage, the liquid crystal summation optic response of this time durations can be reduced to minimum, remove overlapping fuzzy purpose of afterimage and effect between shown picture and reach.
Fuzzy image removal method
Below be the driving method of the LCD analog-driven device of the 5th embodiment according to the present invention, it may further comprise the steps:
To have recurrent pulse waveform data signal D
1Offer the source electrode of this transistor Q1;
Provide first, second and the 3rd output of OE and STH control signal to start (OE) incoming line and open beginning horizontal pulse (STH) incoming line to this gate drivers, and receive coherent signal via these incoming lines, it is to control in this way that the output of being imported of these gate drivers starts (OE) signal, so that produce two groups of synchronous control potential pulses in the output of these gate drivers, it is selected by following three groups of control potential pulses: (1) (G
1, G
m), (2) (G
M+1, G
2m), (3) (G
2m+1, G
3m), and with selected and be combined into two groups controls of the configuration potential pulses (1 of these three groups control potential pulses, 3) or (1,2) or (2,3) be supplied to the grid of this transistor Q1 via its pairing first, second or the 3rd input control line with the cycle alternation pattern; It is characterized by
When being triggered by these two groups of synchronous control signals (1,3) or (1,2) or (2,3), this circuit is with this data-signal this outputting drive voltage line of feeding; To export to this pixel by this outputting drive voltage that above step produced, can on display screen, produce two synchronous input control lines of the 2m bar input control line of being separated by simultaneously, with show image with the cycle alternation pattern; And
In this black line scan period, when the brightness of this back light unit is reduced to minimum via its control voltage, the liquid crystal summation optic response of this time durations can be reduced to minimum, remove overlapping fuzzy purpose of afterimage and effect between shown picture and reach.
Wave form analysis
Describe the liquid crystal drive voltage pulse V that analogue means produced of Figure 11 a, the b of the 5th embodiment according to the present invention in detail below with reference to Figure 12 a to 12d
LC, the relation between waveform such as liquid crystal summation optic response Lq, backlight control voltage BV and backlight illumination response BL.
Owing to all use alternating current (AC) as driving voltage usually, therefore, in its control and driving process, have the phenomenon that positive-negative phase alternately occurs, i.e. drive voltage pulses V to liquid crystal
LCWaveform with respect to reference voltage V
COMHave the positive and negative phenomenon that alternates and occur.
This waveform is to repeat according to the circulation of the time sequencing of time point A1 to A7 with the following methods: at time point A
1Drive voltage pulses V in N-1 the picture before
LCValue V
1' (code 0) be negative polarity; The value of backlight control voltage BV is BV0, and the value of backlight illumination response BL is BL0, and the liquid crystal summation optic response value of this moment is Lq1;
And at time point A
1Begin to enter N picture, at this moment drive voltage pulses V
LCValue rise to V
2(code 32) and be positive polarity, and be retained to time point A always
2Till, this moment, backlight control voltage BV rose to BV1, and the value of backlight illumination response BL rises to BL1 gradually from BL0, till the liquid crystal summation optic response value of this moment rises to the Lq2 of time point A2 gradually from the Lq1 of time point A1;
Time proceeds to time point A2 then, at this moment drive voltage pulses V
LCValue drop to V1 (code 0) and be positive polarity from V2 (code 32), and the value of backlight control voltage BV still remains on BV1, the value of backlight illumination response BL also remains on BL1, and the Lq2 of summation liquid crystal optical response value during from time point A2 begins to descend, till the value Lq1 when arriving time point A4 via time point A3;
Time proceeds to time point A3 then, at this moment drive voltage pulses V
LCValue still keep V1 (code 0) and be positive polarity, this moment, the value of backlight control voltage BV dropped to BV0, the value of backlight illumination response BL continues to drop to gradually the BL0 of time point A4 from the BL1 of time point A3, and this summation liquid crystal optical response value drops to Lq1 one after a while till time point A4;
Time proceeds to time point A4 then, at this moment drive voltage pulses V
LCValue drop to V3 ' (code 120) from V1 (code 0), and be negative polarity, the value of backlight control voltage BV rises to BV1, and the value of backlight illumination response BL begins to rise to gradually BL1, and till the value Lq3 of liquid crystal summation optic response value when time point A4 begins to rise to time point A5 gradually;
Time proceeds to time point A5 then, at this moment drive voltage pulses V
LCValue rise to V1 ' (code 0), and be negative polarity, this moment, the value of backlight control voltage BV still kept BV1, and the value of backlight illumination response BL is from also keeping BL1, and this summation liquid crystal optical response value continues to descend via time point A6, drop to Lq1 after a while continues to till the time point A7 then;
Time proceeds to time point A6 then, at this moment drive voltage pulses V
LCValue still keep V1 ' (code 0), and be negative polarity, this moment backlight control voltage BV value drop to BV0 and be retained to time point A7 always from BV1 till, the value of backlight illumination response BL continues to drop to gradually the BL0 of time point A7 from the BL1 of time point A6, and this liquid crystal summation optic response value drops to Lq1 after a while and continues to till the time point A7 always;
Time proceeds to time point A7 and begins to enter N+2 picture then, at this picture drive potential pulse V
LC, backlight control voltage BV, backlight illumination response BL and this liquid crystal summation optic response Lq etc. wave form varies and N+1 picture during time point A4-A7 between the variation of this waveform identical, therefore, no longer repeat at this.As for the variation of above-mentioned each waveform during each picture after the N+2 picture, all can derive easily and learn according to above explanation.
Liquid crystal optical response family curve when dotted line shown in Figure 12 a drives for implementing simulation CRT video picture.As the outputting drive voltage V of this device between each time point in this figure
LCDuring for (code 0), promptly be illustrated in this moment between during in the enterprising line scanning black line of display screen (black line), it can reach with known technology and insert the identical effect of black picture between picture.In addition, the present invention's design moderately reduces the brightness of back light unit, so that its summation liquid crystal optical response value Lq minimizes, to guarantee to eliminate " afterimage " overlapping fuzzy phenomenon between picture.And reach purpose really with the simulation CRT monitor pulsed video picture of LCD display.This is the maximum characteristics that the present invention is better than known technology.For convenience of description with understand for the purpose of, the drive voltage pulses V that analogue means was exported shown in present embodiment was above
LC, curve such as liquid crystal summation optic response Lq, backlight control voltage BV and backlight illumination response BL waveform identical with embodiment 1, to avoid in declarative procedure, causing too complicated elusive situation; But can according to actual demand this Waveform Design be become to have the waveform of various variations by the deviser.
Embodiment 6
Below with reference to Figure 11 a, b and Figure 13 a to d the 6th embodiment of the present invention is described.The device of the 6th embodiment and the 5th embodiment discussed above all uses Figure 11 a, the b explanation, and its purpose is to show identical device, but can reach different imaging results with different control methods on display screen.
Please refer to Fig. 1, Figure 11 a, b and Figure 13 a to d the 6th embodiment of the present invention is described.
At first, please refer to Fig. 1, it shows the display panels that according to the present invention the 6th embodiment is used and the configuration structure of back light unit.
Figure 11 a is by the pel array that intersection point constituted of a plurality of gate lines and data line and by analog drive circuit that a plurality of data driver and a plurality of gate drivers constituted according to present embodiment.
Figure 11 b is the LCD analog-driven device according to present embodiment.Figure 11 b is the enlarged drawing that indicates the 11b place among Figure 11 a.
Figure 13 a to 13d is the liquid crystal drive voltage pulse V that the analog-driven device of Figure 11 a, the b of present embodiment is produced
LC, the relation between curve waveform such as liquid crystal summation optic response Lq, backlight control voltage BV and backlight illumination response BL.
The fuzzy image removal device
By Figure 11 a, b as can be known, LCD acceleration drive unit comprises:
The first input control line G
1The second input control line G
M+1The 3rd input control line G
2m+1The first input data line D
1The first capacitor C
SThe second capacitor C
LCAnd outputting drive voltage line; And
The first transistor Q1 comprises: grid is connected to first input control line or second input control line or the 3rd input control line, source electrode is connected to the first input data line D
1, and the drain electrode be connected to the outputting drive voltage line in parallel with two and capacitor C
S, C
LC
Wherein first capacitor and second capacitor respectively are respectively reservior capacitor and liquid crystal equivalent condenser, and ground connection all, and this outputting drive voltage line is to be used for exporting this Simulation drive voltage this pixel of LCD panel to show image; And
Comprise back light unit and voltage input control line backlight that the brightness may command is adjusted;
It is characterized by
This input data line is connected to a data driver, this input control line is connected to gate drivers, this gate drivers has first, second and the 3rd output starts (OE) incoming line and opens beginning horizontal pulse (STH) incoming line, and receive coherent signal via these incoming lines, it is to control by this way that the output of being imported of this gate drivers starts (OE) signal, so that produce three groups of synchronous control potential pulses at the output terminal of this gate drivers, it is made of following three groups of control potential pulses: (1) (G
1, G
m), (2) (G
M+1, G
2m), (3) (G
2m+1, G
3m), these three groups control potential pulses (1,2,3) are supplied to the grid of this transistor (Q1) via its pairing first, second or the 3rd input control line.It is characterized by
When being triggered by this three groups of synchronous control signals (1,2,3), this circuit is with this data-signal this outputting drive voltage line of feeding; Control and the drive voltage pulses V that produces via it
LCCan drive pixel produces the m bar input control line of being separated by simultaneously on display screen three synchronous input control lines, with show image; And
In this black line scan period, when the brightness of this back light unit is reduced to minimum via its control voltage, the liquid crystal summation optic response of this time durations can be reduced to minimum, remove overlapping fuzzy purpose of afterimage and effect between shown picture and reach.
Fuzzy image removal method
Below be the driving method of the LCD analog-driven device of the 6th embodiment according to the present invention, may further comprise the steps:
To have recurrent pulse waveform data signal D
1Offer the source electrode of this transistor Q1;
Provide first, second and the 3rd output of OE and STH control signal to start (OE) incoming line and open beginning horizontal pulse (STH) incoming line to this gate drivers, and receive coherent signal through incoming line thus, it is to control in this way that the output of being imported of this gate drivers starts (OE) signal, so that produce three groups of synchronous control potential pulses at the output terminal of this gate drivers, it is made of following three groups of control potential pulses: (1) (G
1, G
m), (2) (G
M+1, G
2m), (3) (G
2m+1, G
3m), these three groups control potential pulses (1,2,3) are supplied to the grid of this transistor Q1 via its pairing first, second or the 3rd input control line.It is characterized by
When being triggered by this three groups of synchronous control signals (1,2,3), this circuit is with this data-signal this outputting drive voltage line of feeding;
To export to this pixel by this outputting drive voltage that above step produced, can on display screen, produce three synchronous input control lines of the m bar input control line of being separated by simultaneously, with show image; And
In this black line scan period, when the brightness of this back light unit is reduced to minimum via its control voltage, the liquid crystal summation optic response of this time durations can be reduced to minimum, remove overlapping fuzzy purpose of afterimage and effect between shown picture and reach.
Wave form analysis
Describe the liquid crystal drive voltage pulse V that analogue means produced of Figure 11 a, the b of this 6th embodiment in detail according to the present invention below with reference to Figure 13 a to 13d
LC, the relation between waveform such as liquid crystal summation optic response Lq, backlight control voltage BV and backlight illumination response BL.
Because identical among the description explanation that this waveform of relevant present embodiment carries out process and the 5th embodiment, the content that therefore please refer to " wave form analysis " part of the 5th embodiment can obtain abundant understanding, in this no longer repeat specification.
Liquid crystal optical response family curve when dotted line shown in Figure 13 a drives for implementing simulation CRT video picture.As the outputting drive voltage V of this device between each time point in this figure
LCDuring for (code 0), promptly be illustrated in this moment between during in the enterprising line scanning black line of display screen (black line), it can reach with known technology and insert the identical effect of black picture between picture.In addition, the present invention's design moderately reduces the brightness of back light unit, so that its summation liquid crystal optical response value Lq minimizes, to guarantee to eliminate " afterimage " overlapping fuzzy phenomenon between picture.And reach purpose really with the video picture of LCD display simulation CRT monitor pulsed.This is the maximum characteristics that the present invention is better than known technology.
For convenience of description with understand for the purpose of, the drive voltage pulses V that analogue means was exported shown in present embodiment was above
LC, curve such as liquid crystal summation optic response Lq, backlight control voltage BV and backlight illumination response BL waveform identical with embodiment 5, to avoid in declarative procedure, causing too complicated elusive situation; But can according to actual demand this Waveform Design be become to have the waveform of various variations by the deviser.
In sum, " removing the fuzzy used method and apparatus of image overlap between picture in the simulation CRT pulsed videograph process " of the present invention can improve and the shortcoming and the restriction that overcome the similar LCD of known technology really, it is in this black line scan period, when the brightness of this back light unit is reduced to minimum via its control voltage, the liquid crystal summation optic response of this time durations can be reduced to minimum, remove overlapping fuzzy purpose of afterimage and effect between shown picture and reach, but and the expense cost of economy system, significantly promote its function.Therefore, method and apparatus of the present invention is better than known technology really.Value on the certain tool industry of the present invention has novelty and progressive, meets patent requirement.
The above only is preferred embodiment of the present invention, and its purpose only is used to illustrate but not is used to limit the content of the present invention and claim; And can do various corrections and variation following of the prerequisite of spirit that does not depart from the present invention and claims and scope by those skilled in the art.
Claims (5)
1. simulate the fuzzy used device of removal image overlap in the CRT pulsed videograph process for one kind, comprising:
First input control line; Second input control line; First input data line; Second input data line; The 3rd input data line; The 4th input data line; The 5th input data line; First capacitor; Second capacitor; The 3rd transistor; The 4th transistor; And outputting drive voltage line;
The first transistor comprises: first grid is connected to first input control line, first source electrode is connected to first input data line, and first drain electrode is connected to the drain electrode of outputting drive voltage line and first capacitor and transistor seconds; And
Transistor seconds comprises: second grid is connected to second input control line, second source electrode is connected to second input data line, and second drain electrode is connected to drain electrode and second capacitor and the outputting drive voltage line of the first transistor;
Wherein first capacitor and second capacitor are respectively reservior capacitor and liquid crystal equivalent condenser, and ground connection all, and this outputting drive voltage line is that the driving voltage that is used for will simulation using exports the LCD panel pixels to; And the back light unit and the voltage input control line backlight that comprise the adjustment of brightness may command;
It is characterized in that:
This first and second input control line is connected to a gate drivers, and this first and second input data line is connected to the drain electrode of the 3rd and the 4th switching transistor of two parallel connections in addition respectively, the source electrode of these two switching transistors in parallel is connected to a data driver, and its grid respectively is connected to the 3rd and the 4th input data line;
Mistiming between the recurrent pulse waveform of first and second control signal is the mistiming between the n bar input control line of n pulse, and is adjustable; And
In black line scan period, when the brightness of this back light unit is reduced to minimum via its control voltage, the liquid crystal summation optic response of this black line scan period can be reduced to minimum, remove overlapping fuzzy purpose of afterimage and effect between shown picture and reach.
2. according to the device of claim 1, it is characterized in that:
This back light unit can depend on the liquid crystal summation optic response, quality and the effect that this LCD desires to reach video picture desiring to reach, and make: the cold fluorescent tube of negative electrode, light emitting diode, Organic Light Emitting Diode, polymer LED and electroluminor by one of following material; And
The luminosity response pattern of this back light unit is: desired value pattern and asymptotic desired value pattern immediately.
3. according to the device of claim 1, it is characterized in that
The reduction degree of depth of the initial time point of (1) luminosity response minimum of this back light unit, the time width of (2) luminosity response minimum, (3) luminosity response minimum all can be adjusted; And therefore caused
(4) actual demand of all visual its made LCD image display quality of the reduction degree of depth of the time width of the initial time point of liquid crystal summation optic response minimum, (5) liquid crystal summation optic response minimum and (6) liquid crystal summation optic response minimum and adjusting.
4. simulate in the CRT pulsed videograph process and to remove the fuzzy used method of image overlap for one kind, it is characterized by and may further comprise the steps:
A circuit is provided, has: first input control line, second input control line, first input data line, second input data line, the 3rd input data line, the 4th input data line, the 5th input data line, the first transistor, transistor seconds, the 3rd transistor, the 4th transistor, first capacitor, second capacitor and outputting drive voltage line;
First control signal that will have the recurrent pulse waveform offers the first transistor grid;
Second control signal that will have the recurrent pulse waveform offers the transistor seconds grid, and second control signal is identical with first control signal except phase delay;
The 5th data-signal is offered the 3rd transistor AND gate the 4th transistorized source electrode in parallel;
Provide the 3rd transistor gate with the 3rd data-signal, and the potential pulse that is produced with its drain electrode offers the source electrode of the first transistor as first data-signal, when the first transistor was triggered by first control signal, this circuit was with first data-signal this outputting drive voltage line of feeding;
Provide the 4th transistor gate with the 4th data-signal, and the voltage pulse signal that is produced with its drain electrode offers the source electrode of transistor seconds as second data-signal, when transistor seconds was triggered by second control signal, this circuit was with second data-signal this outputting drive voltage line of feeding;
To export to pixel by the outputting drive voltage that above step produced, with show image; And
In black line scan period, when the brightness of this back light unit is reduced to minimum via its control voltage, the liquid crystal summation optic response of this black line scan period can be reduced to minimum, remove overlapping fuzzy purpose of afterimage and effect between shown picture and reach.
5. according to the method for claim 4, wherein
Use alternating current as control voltage and driving voltage, thereby this voltage has the phenomenon that positive-negative phase alternately occurs in its controlling and driving process, process that it carries out such as following mode repeat according to the time sequencing circulation of time point A1 to A6:
(a) at time point A
1Drive voltage pulses V in N-1 the picture before
LCValue V
1' (code0) be negative polarity; The value of backlight control voltage BV is BV0, and the value of backlight illumination response BL is BL0, and the liquid crystal summation optic response value of this moment is Lq1;
(b) at time point A
1Begin to enter N picture, at this moment drive voltage pulses V
LCValue rise to V
2(code32), and be positive polarity, and be retained to time point A always
2Till, this moment, backlight control voltage BV rose to BV1, and the value of backlight illumination response BL rises to BL1 gradually from BL0, till the liquid crystal summation optic response value of this moment rises to the Lq2 of time point A2 gradually from the Lq1 of time point A1;
(c) time proceeds to time point A2 then, at this moment drive voltage pulses V
LCValue drop to V1 (code 0) from V2 (code32), and be positive polarity, and the value of backlight control voltage BV still remains on BV1, the value of backlight illumination response BL also remains on BL1, and the Lq2 of liquid crystal summation optic response value during from time point A2 begins to descend, till the value Lq1 when arriving time point A4 via time point A3;
(d) time proceeds to time point A3 then, at this moment drive voltage pulses V
LCValue still keep V1 (code 0) and be positive polarity, this moment, the value of backlight control voltage BV dropped to BV0, the value of backlight illumination response BL continues to drop to gradually the BL0 of time point A4 from the BL1 of time point A3, and this liquid crystal summation optic response value drops to Lq1 one after a while till time point A4;
(e) time proceeds to time point A4 and begins to enter N+1 picture then, this moment drive voltage pulses V
LCValue drop to V3 ' (code 120) and be negative polarity from V1 (code 0), the value of backlight control voltage BV rises to BV1, the value of backlight illumination response BL begins to rise to gradually BL1, and till the value Lq3 of liquid crystal summation optic response value when time point A4 begins to rise to time point A5 gradually;
(f) time proceeds to time point A5 then, at this moment drive voltage pulses V
LCValue rise to V1 ' (code 0), and be negative polarity, this moment, the value of backlight control voltage BV still kept BV1, and the value of backlight illumination response BL also keeps BL1, and this liquid crystal summation optic response value continues to descend via time point A6, drop to Lq1 after a while continues to till the time point A7 then;
(g) time proceeds to time point A6 then, at this moment drive voltage pulses V
LCValue still keep V1 ' (code 0) and be negative polarity, this moment backlight control voltage BV value drop to BV0 and be retained to time point A7 always from BV1 till, the value of backlight illumination response BL continues to drop to gradually the BL0 of time point A7 from the BL1 of time point A6, and this liquid crystal summation optic response value drops to Lq1 after a while and continues to till the time point A7 always; And
(h) time proceeds to time point A7 and begins to enter N+2 picture then, and its situation is identical with above-mentioned steps (e).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100481934A CN100489948C (en) | 2004-06-21 | 2004-06-21 | Method and device for removing image fuzzy blur between frames |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100481934A CN100489948C (en) | 2004-06-21 | 2004-06-21 | Method and device for removing image fuzzy blur between frames |
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| CN1713261A CN1713261A (en) | 2005-12-28 |
| CN100489948C true CN100489948C (en) | 2009-05-20 |
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| CN1996459B (en) * | 2006-01-05 | 2012-01-04 | 奇美电子股份有限公司 | Liquid crystal display device and drive method therefor |
| CN101127197B (en) * | 2006-08-14 | 2010-12-08 | 奇美电子股份有限公司 | Liquid crystal display device and its driving method |
| FR2905027B1 (en) * | 2006-08-21 | 2013-12-20 | Lg Philips Lcd Co Ltd | LIQUID CRYSTAL DISPLAY DEVICE AND ITS CONTROL METHOD |
| CN101587269B (en) * | 2008-05-20 | 2012-01-18 | 上海天马微电子有限公司 | Liquid crystal display device |
| CN114220378B (en) * | 2022-01-07 | 2024-01-19 | 惠州视维新技术有限公司 | Shunt circuit of display device and display device |
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