CN101303848B

CN101303848B - image scaling method and device

Info

Publication number: CN101303848B
Application number: CN2007101034359A
Authority: CN
Inventors: 吕家亿; 王佳煜
Original assignee: Chunghwa Picture Tubes Ltd
Current assignee: Chunghwa Picture Tubes Ltd
Priority date: 2007-05-11
Filing date: 2007-05-11
Publication date: 2010-09-29
Anticipated expiration: 2027-05-11
Also published as: CN101303848A

Abstract

The invention discloses an image zooming method and device, wherein the method comprises the following steps: providing a plurality of scan periods; providing a plurality of scan data, wherein an ith scan period provides ith scan data; and driving at least two adjacent scanning lines by using jth scanning data in a jth scanning period, wherein i and j are positive integers. The invention can increase the functions of the flat panel display module, solve the problem of image scaling, improve the comfort of a flat panel display viewer, avoid the charging error of the thin film transistor and improve the image quality.

Description

Image scaling method and device

Technical field

The invention relates to a kind of image scaling method, and particularly relevant for a kind of image scaling method and device that can promote image quality.

Background technology

Along with high-tech development, video product, particularly digitized video or device for image become in general daily life common product.In these digitized videos or the device for image, display is a critical elements, to show relevant information.The user can read information by display, or and then the running of control device.

And the display of being gazed at most at present is the flat-panel screens that cooperates photoelectric technology and semiconductor fabrication to be developed, for example LCD (Liquid Crystal Display, LCD).Because LCD has advantages such as low voltage operating, radiationless line scattering, in light weight and volume are little, and become the major subjects of display research in recent years, the large scale liquid crystal display TV of the present develop actively of industry particularly, more because possess that size is big, image quality is excellent, briliancy is high and advantage such as the visual angle is wide, and become the main flow of large scale flat-surface television.

Fig. 1 illustrates and is existing flat-panel screens module.As shown in Figure 1, comprise flat-panel screens 11, time schedule controller (Timing Controller) 13, scanner driver (Scan Driver IC) 14, data driver (Data Driver IC) 15.Flat-panel screens 11, as common Thin Film Transistor-LCD (Thin FilmTransistor LCD, TFT-LCD).

Time schedule controller 13 output scanning data and control signal arrive data driver, and output a control signal to scanner driver.When scanner driver with the thin film transistor (TFT) (TFT) of each bar sweep trace when opening, data driver can convert corresponding scan-data to voltage, the voltage of the capacitor charge and discharge of liquid crystal panel to corresponding GTG.

Fig. 2 illustrates the sequential chart (Timing Chart) that outputs a control signal to scanner driver for the time schedule controller of existing Fig. 1.As shown in Figure 2, it illustrates the 1st～the 12nd scanning drive signal OUT1～OUT12 (all the other do not illustrate), output enable signal OE (Output Enable), scan clock signal CLKV and an enabling signal STV.Enabling signal STV is used for starting scanning drive signal OUT1, when enabling signal STV activation, and clock signal clk V to be scanned activation, then activation scanning drive signal OUT1.When enabling signal STV anergy, clock signal clk V to be scanned activation, then scanning drive signal OUT1 anergy.

Output enable signal OE can be used to adjust scanner driver 14 outputs scanning drive signal OUT pulse wave at interval.In the time of output enable signal OE activation, the scanning drive signal anergy, after all closing with the thin film transistor (TFT) of guaranteeing n bar sweep trace, the thin film transistor (TFT) of n+1 bar is just opened, and avoids the wrong situation of electric capacity charging to take place.

But this existing method only uses 1 output enable signal OE, also only can have the capacitor charge and discharge operation of flat-panel screens now, though can avoid the wrong situation of electric capacity charging to take place, but function is but too dull, stressing multi-functional now and epoch efficient, prior art can cause the backwardness of product competitiveness.

Consider that people improve gradually for the requirement of quality of the life, the general mood of tourism and leisure is also more and more in vogue, being open to traffic the time when dismissing long-distance travel, video playback apparatus and flat-panel screens also slowly towards vehicle-mounted field development.Yet, being subjected to the restriction in vehicle-mounted space, the size of vehicle-mounted flat-panel screens is also little, and therefore in order to improve beholder's comfort level, flat-panel screens certainly will derive the problem of image-zooming.

Summary of the invention

One of purpose of the present invention is providing a kind of image scaling method exactly, can increase the function of flat-panel screens module, solve the problem of image-zooming, improve flat-panel screens beholder comfort level, and can avoid thin film transistor (TFT) charging mistake, promote image quality.

A further object of the present invention provides a kind of image zoom device, can convergent-divergent flat-panel screens image, and reduce beholder's immoderation, and can increase thin film transistor (TFT) charging accuracy, improve image quality.

Based on above-mentioned purpose, the present invention proposes a kind of image scaling method, and this image scaling method system is used for a flat-panel screens, and flat-panel screens comprises the multi-strip scanning line, and the method comprises: a plurality of scan periods are provided; A plurality of scan-datas are provided, and wherein i scan period provides the i scan-data; And in j scan period, with at least two adjacent sweep traces of j scanning data drive, i wherein, j is a positive integer.

According to image scaling method of the present invention, also comprise: the one scan clock signal is provided, wherein during scan clock signal activation the k time, starts k bar sweep trace, wherein k is a positive integer; I scan period, scan clock signal operates at a first frequency; And j scan period, scan clock signal operates at a second frequency, and wherein, second frequency is greater than first frequency, and j scan period, scan clock signal activation number of times at least twice.

According to image scaling method of the present invention, also comprise: provide a plurality of scanning drive signal, more corresponding respectively sweep traces; According to scan clock signal, a little scanning drive signal of activation in regular turn are with a little sweep traces of correspondence startup in regular turn; One output enable signal is provided, when the output enable signal activation, a little scanning drive signal anergies; At least one Preset Time activation output enable signal before the scan clock signal activation; And after the scan clock signal activation Preset Time anergy output enable signal at least.

According to image scaling method of the present invention, the time of above-mentioned output enable signal activation is less than scan period.

According to image scaling method of the present invention, also comprise: one first, 1 second and 1 the 3rd output enable signal is provided, when the first output enable signal activation, corresponding 3m-2 bar sweep trace anergy, when the second output enable signal activation, corresponding 3m-1 bar sweep trace anergy is when the 3rd output enable signal activation, corresponding 3m bar sweep trace anergy, wherein m is a positive integer.

According to image scaling method of the present invention, above-mentioned scan period is a horizontal synchronizing cycle.

According to image scaling method of the present invention, above-mentioned flat-panel screens is a LCD.

The present invention proposes a kind of image zoom device, and this image zoom device is to be used for a flat-panel screens, and flat-panel screens comprises the multi-strip scanning line, and this device comprises a zoom mode detector, and a sequential corrector.The zoom mode detector is in order to export convergent-divergent decision signal.The sequential corrector couples the zoom mode detector, receives convergent-divergent decision signal, in order to export one first, 1 second and 1 the 3rd output enable signal, when the activation of convergent-divergent decision signal, anergy first, second and the 3rd output enable signal wherein two.

According to image zoom device of the present invention, also comprise a vertical timing sequence generating circuit, couple the zoom mode detector, in order to produce a vertical sequential.

According to image zoom device of the present invention, also comprise an output circuit, in order to increase the driving force of first, second and the 3rd output enable signal.

According to image zoom device of the present invention, above-mentioned sequential corrector is also in order to output one scan clock signal, when the activation of convergent-divergent decision signal, a first frequency of scan clock signal is adjusted into a second frequency, and wherein second frequency is greater than first frequency.

The present invention provides a plurality of scan periods because of adopting image scaling method; A plurality of scan-datas are provided, and wherein i scan period provides the i scan-data; And in j scan period, with at least two adjacent sweep traces of j scanning data drive, i wherein, j is a positive integer, therefore can increase the function of flat-panel screens module, solve the problem of flat-panel screens image-zooming, and can avoid thin film transistor (TFT) charging mistake, promote image quality, increase the user and view and admire comfort level.

Description of drawings

For above-mentioned purpose of the present invention, feature and advantage can be become apparent, below in conjunction with accompanying drawing the specific embodiment of the present invention is elaborated, wherein:

Fig. 1 illustrates and is existing flat-panel screens module.

Fig. 2 illustrates the sequential chart that outputs a control signal to scanner driver for the time schedule controller of Fig. 1.

Fig. 3 illustrates to using the flat-panel screens module of embodiment of the invention image zoom device.

Fig. 4 illustrates the image zoom device into the embodiment of the invention.

Fig. 5 illustrates the sequential chart into Fig. 4 embodiment.

Fig. 6 a illustrates the normal mode show image into the embodiment of the invention.

Fig. 6 b illustrates the zoom mode show image into the embodiment of the invention.

Fig. 7 illustrates the image scaling method flow chart of steps into the embodiment of the invention.

Fig. 8 illustrates the image scaling method flow chart of steps into another embodiment of the present invention.

Fig. 9 illustrates the sequential chart into Fig. 8 embodiment.

Embodiment

The output enable signal of prior art, only be designed to be used to adjust scanner driver output scanning drive signal pulse wave at interval, after all closing with the thin film transistor (TFT) of guaranteeing a last sweep trace, the thin film transistor (TFT) of next bar is just opened, and the wrong situation of avoiding charging takes place.Considering simulation system, for example be vehicle-mounted market, after the demand of convergent-divergent (Zoom) function, the present invention proposes a kind of image scaling method, can increase the function of flat-panel screens module, solve the problem of image-zooming, improve flat-panel screens beholder comfort level, and can avoid thin film transistor (TFT) charging mistake, promote the quality of image.Below just the present invention is described with embodiment.

Fig. 3 illustrates to using the flat-panel screens module of embodiment of the invention image zoom device.As shown in Figure 3, the flat-panel screens module comprises flat-panel screens 31, image zoom device 32, time schedule controller 33, scanner driver 34, data driver 35.Time schedule controller 33 output scanning data da and control signal output a control signal to scanner driver 34, and output a control signal to image zoom device 32 to data driver 35.Image zoom device 32 meeting generation output enable signal OE and scan clock signal CLKV are to scanner driver 34.

Scanner driver 34 can be adjusted the pulse wave interval of the scanning drive signal of multi-strip scanning line according to output enable signal OE and scan clock signal CLKV.Data driver 35 can be exported every scan-data according to control signal in regular turn in each scan period.When each scanning drive signal was opened the thin film transistor (TFT) of corresponding each bar sweep trace, scan-data can arrive the capacitor charge and discharge of corresponding liquid crystal panel the voltage of corresponding GTG, finishes display action.

Fig. 4 illustrates the image zoom device into the embodiment of the invention.As shown in Figure 4, image zoom device 32 comprises vertical timing sequence generating circuit 41, zoom mode detector 42, sequential corrector 43, output circuit 44.The clock generator of Fig. 4 can be a pulse generator.

Please also refer to Fig. 4 and Fig. 3, vertical timing sequence generating circuit 41 receives the output signal of time schedule controllers 33, produces the required sequential of scanner driver 34.Zoom mode detector 42 judges that according to the vertical sequential v that vertical timing sequence generating circuit 41 produces image need amplify or keep normally, whether needs to enter zoom mode, if image needs to amplify, exports convergent-divergent decision signal Y; If image need be kept normally, then export convergent-divergent decision signal N, do image-zooming without sequential corrector 43, directly output.

Sequential corrector 43 receives convergent-divergent decision signal Y, in order to export one first output enable signal OE1, one second output enable signal OE2, one the 3rd output enable signal OE3 and one scan clock signal clk V to output circuit 44.Output circuit 44 is promptly exported above-mentioned output enable signal OE1～OE3 and scan clock signal CLKV after the driving force that increases output enable signal OE1～OE3.

Fig. 5 illustrates the sequential chart into Fig. 4 embodiment.As shown in Figure 5, its illustrate the 1st～the 8th scanning drive signal OUT1～OUT8 (all the other do not illustrate), output enable signal OE1～OE3, scan clock signal CLKV and enabling signal STV.Enabling signal STV is used for starting the first output enable signal OE1, when enabling signal STV is activation, and clock signal clk V to be scanned activation, scan clock signal CLKV is considered as activation en1, scanning drive signal OUT1 activation the 1st time.When enabling signal STV anergy, clock signal clk V activation en4 to be scanned, then scanning drive signal OUT1 is an anergy.

The k time enk of scan clock signal CLKV activation can start k bar sweep trace, the OUTk of activation scanning drive signal just.For instance, during the 1st activation en1 of scan clock signal CLKV, activation scanning drive signal OUT1, during the 3rd activation en3 of scan clock signal CLKV, activation scanning drive signal OUT3, during scan clock signal CLKV the 4th activation en4, activation scanning drive signal OUT4.Those skilled in the art should know, the mode of operation that scanning drive signal OUT1～the OUT8 pulse wave moves can be finished by shift registor (Shift Register), so do not repeat them here.

Please also refer to Fig. 4 and Fig. 5, the scanning drive signal on output enable signal OE1～OE3 difference corresponding 3m-2,3m-1 and the 3m bar sweep trace, wherein m is a positive integer.For instance, the corresponding scanning drive signal OUT1 of the first output enable signal OE1, OUT4, OUT7..., the corresponding scanning drive signal OUT2 of the second output enable signal OE2, OUT5, OUT8..., the corresponding scanning drive signal OUT3 of the 3rd output enable signal OE3, OUT6....When output enable signal OE activation, corresponding scanning drive signal OUT is anergy then.

In other words, scanning drive signal OUT1 should be enabled at the 1st scan period sp1～the 3rd scan period sp3, but because the first output enable signal OE1 in scan period sp1 and scan period sp3 activation, so scanning drive signal OUT1 is only in scan period sp2 activation.Same reason, scanning drive signal OUT2 is only in scan period sp3 activation.

At scan period sp3, output enable signal OE1, OE2, OE3 are set in activation, anergy, disabled state respectively, make scanning drive signal OUT3 only in scan period sp3 activation.Thus, scanning drive signal OUT2 and scanning drive signal OUT3 can be in same scan period sp3 activations, and the electric capacity on the corresponding sweep trace will be write by same scan-data da3.

Equally within scan period sp3, scan clock signal CLKV can operate 2 times to usual frequency, make scanning drive signal OUT4 can do sth. in advance half scan period activation.Cooperate activation/disabled state of output enable signal OE1～OE3, scanning drive signal OUT4 will be in scan period sp4 activation.So design can make scanning drive signal OUT7 1 scan period activation ahead of time, and makes scanning drive signal OUT6, OUT7 the 6th scan period sp6 activation that coexists, and the electric capacity on the corresponding sweep trace will be write by same scan-data da6.Therefore, the frequency of operation of gated sweep clock signal clk V cooperates activation/anergy of controlling output enable signal OE1～OE3, can finish zoom function.

Fig. 6 a illustrates the normal mode show image into the embodiment of the invention.Fig. 6 b illustrates the zoom mode show image into the embodiment of the invention.Please also refer to Fig. 5 and Fig. 6 a, Fig. 6 b, by above-mentioned mode of operation, Fig. 6 b can be with the image of Fig. 6 a, the local amplification on Z-axis, finish the zoom mode function of present embodiment, solve the problem of image-zooming, improve flat-panel screens user comfort level, and have and avoid the wrong advantage of thin film transistor (TFT) charging, promote image quality.

Fig. 7 illustrates the image scaling method flow chart of steps into the embodiment of the invention.Please also refer to Fig. 7 and Fig. 5, at first step S71 provides a plurality of scan periods, and next step S72 provides a plurality of scan-datas, and wherein i scan period spi provides i scan-data dai, as Fig. 5 scan period of below and the relation of scan-data.

Then at step S73, in j scan period, with at least two adjacent sweep traces of j scanning data drive.As shown in the figure, promptly be at the 3rd scan period sp3, with the 3rd scan-data da3 drive the 2nd with the 3rd two adjacent sweep traces, and at the 6th scan period sp6, with the 6th of the 6th scanning data drive and the 7th two adjacent sweep traces, finish the image-zooming of present embodiment.In addition, present embodiment drives 8 corresponding sweep traces of output drive signal OUT1～OUT8 because with 6 scan-data da2～da7,6 scan-data da2～da7 is write the electric capacity of 8 thin film transistor (TFT)s, so vertically enlargement ratio is 4/3.

What deserves to be mentioned is, though image scaling method has been depicted some possible kenels in the foregoing description, but those skilled in the art should know, each manufacturer is for scanning drive signal OUT, the design of output enable signal OE and scan clock signal CLKV is all different, and therefore application of the present invention is when being not restricted to the possible kenel of this kind.In other words, as long as utilize same scan-data, driving at least two adjacent sweep traces in same scan period, amplify to carry out image, has been to have met spiritual place of the present invention just.

In order to allow those skilled in the art can more understand spiritual place of the present invention, next will enumerate another kind of embodiment.

Fig. 8 illustrates the image scaling method flow chart of steps into another embodiment of the present invention.Fig. 9 illustrates the sequential chart into Fig. 8 embodiment.Please also refer to Fig. 8 and Fig. 9, at first during step S80 provides one scan, provide the one scan clock signal at step S81 then, the CKLV of Fig. 9 just, this scan clock signal activation the k time can start k bar sweep trace.Step S82 provides scan-data, just da1～da9 of Fig. 9.

Next step S83 can be i scan period, allow above-mentioned scan clock signal running at a first frequency, as Fig. 9 in scan period sp1, sp3～4, the frequency of sp6～9, this first frequency is a scan period activation once.Step S84 can allow above-mentioned scan clock signal running at a second frequency j scan period, and as the frequency of Fig. 9 at scan period sp2 and scan period sp5, this second frequency is a scan period activation twice, greater than first frequency.

At step S85, provide a plurality of scanning drive signal of corresponding above-mentioned sweep trace respectively, as scanning drive signal OUT1～OUT12 of Fig. 9.Then at step S86, according to scan clock signal, activation scanning drive signal in regular turn is with the above-mentioned sweep trace of correspondence startup in regular turn, at Fig. 9 then is when scan clock signal CKLV makes scanning drive signal OUT1～OUT12 activation in regular turn, sweep trace 1～12 is understood corresponding activation, scan-data da1～da9 of corresponding scan period 1～9 is write the electric capacity of thin film transistor (TFT).

Then provide an output enable signal at step S87, when the output enable signal activation, scanning drive signal is anergy then.And then at step S88 and step S89, allow at least one Preset Time activation output enable signal before the scan clock signal activation, and allow above-mentioned at least Preset Time anergy output enable signal after the scan clock signal activation.

For instance, as shown in Figure 9, when enabling signal STV activation, clock signal clk V activation en1 to be scanned, scanning drive signal OUT1 activation is up to output enable signal OE activation, scanning drive signal OUT1 anergy.The 2nd activation en2 of scan clock signal CLKV afterwards, treat output enable signal OE anergy after, scanning drive signal OUT2 activation.Please examine Fig. 9 illustrates, the 2nd activation en2 of scan clock signal CLKV is Preset Time to the time of output enable signal OE anergy, same reason, output enable signal OE activation to time of the 2nd activation en2 of scan clock signal CLKV promptly greater than above-mentioned Preset Time.So, can avoid thin film transistor (TFT) charging mistake, promote the quality of image.

According to step S80～S89, at the 2nd scan period sp2, scan-data da2 will drive the 2nd with the 3rd two adjacent sweep traces, and at the 5th scan period sp5, scan-data da5 will drive the 6th with the 7th two adjacent sweep traces, finish the image-zooming function of present embodiment.Present embodiment drives 12 corresponding sweep traces of output drive signal OUT1～OUT12 because 9 scan-data da1～da9,9 scan-data da1～da9 is write the electric capacity of 12 thin film transistor (TFT)s, so vertically enlargement ratio is 4/3.

Those skilled in the art should know, each manufacturer is all different for the design with at least two adjacent scanning lines of scanning data drive, so long as do not break away from spirit of the present invention, all can use the present invention removes to solve image-zooming and promotes image quality, make the consumer when watching flat-panel screens, have and be better than existing comfort level.Therefore application of the present invention should not be confined to the foregoing description, with the combinations such as activation/anergy of the frequency change collocation output enable signal OE of scan clock signal CKLV.

In sum, the present invention at image scaling method because of a plurality of scan periods are provided; A plurality of scan-datas are provided, and one of them scan period provides a scan-data; And in same scan period, with at least two adjacent sweep traces of same scanning data drive, therefore reach the function that increases the flat-panel screens module, solve the problem of image-zooming, improve flat-panel screens beholder comfort level, and avoid thin film transistor (TFT) charging mistake, promote the purpose of image quality.

Though the present invention discloses as above with preferred embodiment; right its is not in order to qualification the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when can doing a little modification and perfect, so protection scope of the present invention is when with being as the criterion that claims were defined.

Claims

1. A method of image scaling, for a flat panel display, the flat panel display includes a plurality of scan lines, the method comprising:

Provide multiple scan periods;

Provide multiple scan data, wherein the i-th scan data is provided during the i-th scan;

During the jth scan period, drive at least two adjacent scan lines with the jth scan data, where i, j are positive integers;

Provide a scan clock signal, wherein when the scan clock signal is enabled for the kth time, start the kth scan line, where k is a positive integer;

During the ith scan period, the scan clock signal operates at a first frequency; and

During the jth scan period, the scan clock signal operates at a second frequency, wherein the second frequency is greater than the first frequency, and during the jth scan period, the scan clock signal is enabled at least twice.

2. The image scaling method according to claim 1, further comprising:

Provide multiple scan driving signals corresponding to the scan lines;

According to the scan clock signal, enabling the scan driving signals in sequence to correspondingly activate the scan lines in sequence;

providing an output enabling signal, when the output enabling signal is enabled, the scanning driving signals are disabled;

enabling the output enable signal at least a predetermined time before the scan clock signal is enabled; and

The output enable signal is disabled at least for the preset time after the scan clock signal is enabled.

3. The image zooming method as claimed in claim 2, wherein the enabling time of the output enabling signal is less than the scanning period.

4. The image scaling method according to claim 1, further comprising:

providing a first, a second and a third output enable signal, when the first output enable signal is enabled, the corresponding 3m-2th scanning line is disabled, when the second output enable signal is enabled When enabled, the corresponding 3m-1th scan line is disabled, and when the third output enabling signal is enabled, the corresponding 3mth scan line is disabled, where m is a positive integer.

5. The image scaling method as claimed in claim 4, wherein the scanning period is a horizontal synchronization period.

6. The image scaling method according to claim 1, wherein the flat panel display is a liquid crystal display.

7. An image scaling device for a flat-panel display, the flat-panel display comprising a plurality of scan lines, the image scaling device provides a plurality of scan periods and a plurality of scan data, wherein the i-th scan period provides the i-th scan data, i is a positive integer, this device includes:

a scaling mode detector for outputting a scaling determination signal; and

A timing corrector, coupled to the scaling mode detector, receives the scaling determination signal, and outputs a first, a second, and a third output enable signal, and when the scaling determination signal is enabled, it is disabled Two of the first, the second, and the third output enable signals, wherein during the j-th scan period, at least two adjacent scan lines are driven with the j-th scan data, where j is a positive integer, and the timing Calibrator also includes:

8. The image scaling device according to claim 7, further comprising:

A vertical timing generating circuit is coupled to the scaling mode detector and used for generating a vertical timing.

9. The image scaling device according to claim 7, further comprising:

An output circuit is used to increase the driving force of the first, the second and the third output enabling signals.