CN1161465A - Method and device for displaying multi-stage grey scale for single color lattice LCD displaying screen - Google Patents
Method and device for displaying multi-stage grey scale for single color lattice LCD displaying screen Download PDFInfo
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- CN1161465A CN1161465A CN 96103075 CN96103075A CN1161465A CN 1161465 A CN1161465 A CN 1161465A CN 96103075 CN96103075 CN 96103075 CN 96103075 A CN96103075 A CN 96103075A CN 1161465 A CN1161465 A CN 1161465A
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Abstract
The displaying method of the present invention consists of decomposing the original gradation image into N-1 pages of monochromatic preprocessing images, storing the monochromatic preprocessing image, displaying each page of monochromatic preprocessing image in order on the liquid crystal displaying screen, the continuous homochromy area of the decompased monochromatic preprocessing image is minimum. Said method increases greatly the frequency of light-shade variation of each displayed image, so the scintillation-free image display is obtd.
Description
The present invention relates to a kind of multi-stage grey scale display packing, be applicable at monochromatic matrix liquid-crystal display screen.The present invention also provides a kind of display device of using this multi-stage grey scale display packing.
At present, LCDs is widely used in various information industries, and is especially more common in the application of PDA(Personal Digital Assistant), electronic dictionary and aspects such as electronic memo, notebook computer.Because in the past general personal digital assistant and electronic dictionary product are usually as word processing, less demanding to graphing capability, what therefore select for use is monochromatic matrix liquid-crystal display screen mostly, development along with development of technology and information industry, and the proposition of information graphicization, the quantity of information that monochrome display can be expressed can not satisfy actual needs, and multi-stage grey scale display and color monitor arise at the historic moment.For PDA and electronic dictionary, the modal LCDs that is applied as multistage black and white gray scale.Time sense of its gray scale figure picture frame layer is strong, contains much information, and result of use is good.
Fig. 4 shows the gray scale display processing method of traditional multi-stage grey scale LCDs.In Fig. 4, be assumed to be the level Four gray scale, its disposal route is that original gray scale figure is resolved into three pages of pre-service figures.In image, certain point should show black (51), then when being decomposed into three pages of pre-service figures, all is changed to the respective point of three pages of pre-service figures black; In image, certain point should show Dark grey (52), then when being decomposed into three pages of pre-service figures, the respective point of first page and second page is changed to black, and is changed to the 3rd page respective point white; In image, certain point should show light gray (53), then when being decomposed into three pages of pre-service figures, first page respective point is changed to black, and is changed to the respective point of second page and the 3rd page white; In image, certain point is answered display white (54), then when being decomposed into three pages of pre-service figures, all is changed to the respective point of three pages of pre-service figures white.
As everyone knows, the persistence of vision effect makes human eye have the characteristic of low-pass filter.Human eye changes insensitive to high frequency, then very responsive to low frequency variations.Therefore, when the light and shade change frequency of pattern hanged down, human eye just can feel to publish picture picture in flicker.In multi-stage grey scale showed, the light and shade change frequency was meant when several pre-service figures show in proper order, and the zone of (homochromy) gray scale such as a certain demonstration shows the width of cloth number of different light and shade color lumps on the display in the unit interval.Suppose on display screen to show that the time of one page is T, for N level gray scale the demonstration page or leaf of N-1 page or leaf will be arranged, therefore, the update cycle that this gray scale shows is (N-1) T, and its light and shade change frequency Ft1 is
Ft1＝1/(N-1)T＝f/(N-1)
Wherein, f=1/T.
As seen along with the increase of number of greyscale levels, the light and shade change frequency reduces.Because the gray scale display processing method of traditional multi-stage grey scale LCDs causes the light and shade change frequency lower, so, cause LCDs when showing the bigger gray level image of progression, to be easy to generate flicker.A kind of method that overcomes this flicker is to improve the LCDs renewal speed, promptly shortens to show the not time T of one page on display screen, improves frequency.But this method will cause increasing substantially of cost.
Therefore, the object of the present invention is to provide a kind of new multi-stage grey scale display packing that is used on the monochromatic matrix liquid-crystal display screen, make to improve in little amplitude in this way and improve the stability that image shows under the display condition of cost, obtain the multi-stage grey scale display effect of flicker free.
Another object of the present invention is to provide a kind of display device of using multi-stage grey scale display packing of the present invention, and it can demonstrate the multi-stage grey scale figure of flicker free.
Design of the present invention is, when original image is resolved into the multipage pretreatment image, makes between every page of pretreatment image the area minimum with homochromy color lump, improving the light and shade change frequency, thereby suppresses flicker effectively.
Therefore, in the multi-stage grey scale display packing that is used on the monochromatic matrix liquid-crystal display screen of the present invention, suppose that its gray-scale displayed progression is the N level, described method comprises:
Original-gray image is resolved into the monochromatic pretreatment image of N-1 page or leaf;
Store the monochromatic pretreatment image of described N-1 page or leaf;
In order described every page of monochromatic pretreatment image is presented on the LCDs;
It is characterized in that, the described monochromatic pre-service figure that resolves into continuously with color lump area minimum.
The present invention also provides a kind of original-gray image is carried out the display device that multi-stage grey scale shows, comprising:
The original-gray image storer is used to store original-gray image;
The image pretreater, the described original-gray image that is used for being stored in the described original-gray image storer resolves into the monochromatic pretreatment image of multipage;
Monochromatic pretreatment image storer is used to store described monochromatic pretreatment image;
LCDs shows described monochromatic pretreatment image; With
The LCDs driver drives described LCDs, and the described monochromatic pretreatment image that is stored in the described monochromatic pretreatment image storer is presented on the described LCDs;
It is characterized in that described image pretreater resolves into continuous monochromatic pretreatment image with color lump area minimum to original-gray image.
Describe embodiments of the invention in detail below in conjunction with accompanying drawing, by embodiment, we can further understand technical characterictic of the present invention, purpose and advantage.
Fig. 1 is the process flow diagram of multi-stage grey scale display packing of the present invention;
Fig. 2 is the design sketch of multi-stage grey scale display packing of the present invention;
Fig. 3 is the structured flowchart of display device of the present invention;
Fig. 4 is the design sketch of traditional display packing.
See also Fig. 1, Fig. 1 shows the flow process of multi-stage grey scale display packing of the present invention.As shown in Figure 1, for a width of cloth original-gray image (31), at first it is resolved into the monochromatic pretreatment image of multipage, and be decided to be first page, second page, the 3rd page successively ... (37), then these pretreatment image are stored in (33) in the pretreatment image storer.From the pretreatment image storer, select certain page of pretreatment image to carry out multi-stage grey scale by display circuit at last and show (34).
In each step shown in Figure 1, the difference of the present invention and traditional display packing is step 37, original-gray image is resolved into the method difference of multipage pre-service figure.Promptly when decomposing grey color dot, respective point is not simply former pages or leaves to be put blackly in each page monochrome image, and the last few pages is put white, but determines the Show Color of respective point in each page according to this coordinate in entire image.Illustrate that below in conjunction with Fig. 2 the present invention decomposes the method for original-gray image.Referring to Fig. 2, in Fig. 2, for the purpose of convenient the description, suppose that gray-scale displayed level N is a level Four, therefore should resolve into the N-1=3 pretreatment image to original-gray image.
As shown in Figure 2:
For the black color dots in the image (61), the respective point in three pages after the decomposition all is set to black;
For the white point in the image (64), the respective point in three pages after the decomposition all is set to white;
For the point of the light gray in the image (63), the Show Color in three pages after the decomposition is provided with according to following mode:
(X-Y)/3 remainder is 0, the first page and puts blackly, puts whitely for second page, puts white for the 3rd page;
(X-Y)/3 remainder is 1, the first page and puts whitely, puts blackly for second page, puts white for the 3rd page;
(X-Y)/3 remainder is 2, the first pages and puts whitely, puts whitely for second page, puts black for the 3rd page;
Wherein: (X Y) is the coordinate figure of shown point.
For the dark-grey point (62) in the image, the Show Color in three pages after the decomposition is provided with according to following mode:
(X-Y)/3 remainder is 0, the first page and puts whitely, puts blackly for second page, puts black for the 3rd page;
(X-Y)/3 remainder is 1, the first page and puts blackly, puts whitely for second page, puts black for the 3rd page;
(X-Y)/3 remainder is 2, the first pages and puts blackly, puts blackly for second page, puts white for the 3rd page.
After every bit in the original-gray image all passes through above-mentioned conversion, resolve into three pages of monochromatic pretreatment image.The big raising of light and shade change frequency of each gray scale that this decomposition method obtains.Even the light piece area that shows is bigger, if after the conversion in monochromatic pretreatment image respective regions a black color dots skip two white points and just can run into another black color dots.Like this, each width of cloth pretreatment image can be thought no light and shade difference in same gray scale color block areas.Produce the shadow tone gradation effect because handy black-white point intersects, add the low-pass filtering feature of human eye, make that the light and shade change frequency with the image of multi-stage grey scale display packing demonstration of the present invention is:
Ft2=1/T=f (T is the time that shows one page on display screen)
As seen, its light and shade change frequency Ft2 be Ft1 N-1 doubly.Because the raising of frequency so the present invention has improved the stability of the image that shows greatly, has been eliminated the scintillation that shows generation with traditional method.
In the present embodiment, be next illustrational with N=4 level gray scale, for N level gray scale demonstration arbitrarily, its general algorithm is as follows:
Certain point coordinates be (X, Y), if this be white, then all the page or leaf put white, otherwise,
If mod ((X-Y)/N)=k,
Then, this point from mod ((k+1+c)/N) page or leaf to mod ((k+m+c)/N) page or leaf put blackly, all the other pages are put white.
Wherein, mod is complementation; M answers gray-scale displayed progression for this point, and from 1 to N-1, numeral is more little, and gray scale is shallow more, and m=N-1 represents that this gray-scale displayed is for black; C is an arbitrary integer.
In another embodiment, can be with following general-purpose algorithm:
Show for N level gray scale, certain point coordinates be (X, Y),
If this be white, then all the page or leaf put white, otherwise,
If mod ((X)/N)=k,
Then, this point from mod ((k+1+c)/N) page or leaf to mod ((k+m+c)/N) page or leaf put blackly, all the other pages are put white.
Wherein, mod is complementation; M answers gray-scale displayed progression for this point, and from 1 to N-1, numeral is more little, and gray scale is shallow more, and m=N-1 represents that this gray-scale displayed is for black; C is an arbitrary integer.
Correspondingly, In yet another embodiment, can be with following general-purpose algorithm:
Show for N level gray scale, certain point coordinates be (X, Y),
If this be white, then all the page or leaf put white, otherwise,
If mod ((Y)/N)=k,
Then, this point from mod ((k+1+c)/N) page or leaf to mod ((k+m+c)/N) page or leaf put blackly, all the other pages are put white.
Wherein, mod is complementation; M answers gray-scale displayed progression for this point, and from 1 to N-1, numeral is more little, and gray scale is shallow more, and m=N-1 represents that this gray-scale displayed is for black; C is an arbitrary integer.
These two kinds of methods also can realize with in the pre-service figure with color lump area minimum.
The display device of using above-mentioned multi-stage grey scale display packing is described below.Fig. 3 is the structured flowchart of display device of the present invention.As shown in Figure 3, display device of the present invention comprises original-gray image storer 120, image processing program storer 19, monochromatic pretreatment image storer 13, central processing unit 11, LCDs static RAM 14, dma controller 15, liquid crystal display screen line row driver 16,17 and LCDs 18.Original-gray image storer 120 storage raw image datas, central processing unit 11 is transferred the image processing program operation from image processing program storer 19, the original image that is stored in the raw image storage device 120 is resolved into the monochromatic pretreatment image of multipage, and they are stored in the monochromatic pretreatment image storer 13.Central processing unit has in fact just constituted image processor with the image processing program that is stored in the image processing program storer 19.The view data that shows on the LCDs when LCDs static RAM 14 is deposited next LCDs display refresh time and arrived, dma controller 15 is sent into the view data in the LCDs static RAM 14 in liquid crystal display screen line row driver 16 and 17 by certain timeticks, the data point brightness liquid crystal display screen 18 corresponding dot matrix that the synchronization pulse that liquid crystal display screen line row driver 16 main 17 provides by dma controller 15 is sent into.LCDs static RAM 14, dma controller 15 and liquid crystal display screen line row driver 17 and 17 constitute the display driver circuit of LCDs 18.
Central processing unit 11 resolves into monochromatic pretreatment image with original-gray image by above-mentioned decomposition method when the runs image processing program, concrete decomposition method, has no longer repeated at this in order to save space above having done detailed description.
The principle that is disclosed above according to the present invention, original multi-level image is resolved into multipage continuously with the monochromatic pretreatment image of color lump area minimum, can make the liquid crystal display displays that to carry out monochromatic demonstration originally go out multiple gray scale, and can manage it to the multi-stage grey scale effect of flicker free.
Claims (8)
1. one kind is used for the multi-stage grey scale display packing that monochromatic dot matrix LCD shows, its gray-scale displayed progression is the N level, and described method comprises:
Original-gray image is resolved into the monochromatic pretreatment image of N-1 page or leaf;
Store the monochromatic pretreatment image of described N-1 page or leaf;
In order described every page of monochromatic pretreatment image is presented on the LCD display;
It is characterized in that, the described monochromatic pre-service figure that resolves into continuously with color lump area minimum.
2. display packing as claimed in claim 1 is characterized in that, described decomposition original-gray image step is carried out according to following condition:
For coordinate be (X, some Y):
If this be white, then all the page or leaf put white, otherwise,
If mod ((X-Y)/N)=k, then, this point from mod ((k+l+c)/N) page or leaf to mod ((k+m+c)/N) page or leaf put blackly, all the other pages are put white; Wherein, mod is complementation; M answers gray-scale displayed progression for this point, from 1 to N-1; C is an arbitrary integer.
3. display packing as claimed in claim 1 is characterized in that, described decomposition original-gray image step is carried out according to following condition:
For coordinate be (X, some Y):
If this be white, then all the page or leaf put white, otherwise,
If mod ((X)/N)=k, then, this point from mod ((k+l+c)/N) page or leaf to mod ((k+m+c)/N) page or leaf put blackly, all the other pages are put white; Wherein, mod is complementation; M answers gray-scale displayed progression for this point, from 1 to N-1; C is an arbitrary integer.
4. display packing as claimed in claim 1 is characterized in that, described decomposition original-gray image step is carried out according to following condition:
For coordinate be (X, some Y):
If this be white, then all the page or leaf put white, otherwise,
If mod ((Y)/N)=k, then, this point from mod ((k+l+c)/N) page or leaf to mod ((k+m+c)/N) page or leaf put blackly, all the other pages are put white; Wherein, mod is complementation; M answers gray-scale displayed progression for this point, from 1 to N-1; C is an arbitrary integer.
5. one kind is carried out the display device that multi-stage grey scale shows to original-gray image, comprising:
The original-gray image storer is used to store original-gray image;
The image pretreater, the described original-gray image that is used for being stored in the described original-gray image storer resolves into the monochromatic pretreatment image of multipage;
Monochromatic pretreatment image storer is used to store described monochromatic pretreatment image;
LCD display shows described monochromatic pretreatment image; With
Lcd driver drives described LCD display, and the described monochromatic pretreatment image that is stored in the described monochromatic pretreatment image storer is presented on the described LCD display;
It is characterized in that described image pretreater resolves into continuous monochromatic pretreatment image with color lump area minimum to original-gray image.
6. display device as claimed in claim 4 is characterized in that, described decomposition original-gray image step is carried out according to following condition:
For coordinate be (X, some Y):
If this be white, then all the page or leaf put white, otherwise,
If mod ((X-Y)/N)=k, then, this point from mod ((k+l+c)/N) page or leaf to mod ((k+m+c)/N) page or leaf put blackly, all the other pages are put white; Wherein, mod is complementation; M answers gray-scale displayed progression for this point, from 1 to N-1; C is an arbitrary integer.
7. display device as claimed in claim 5 is characterized in that, described decomposition original-gray image step is carried out according to following condition:
For coordinate be (X, the point that Y) is:
If this be white, then all the page or leaf put white, otherwise,
If mod ((X)/N)=k, then, this point from mod ((k+l+c)/N) page or leaf to mod ((k+m+c)/N) page or leaf put blackly, all the other pages are put white; Wherein, mod is complementation; M answers gray-scale displayed progression for this point, from 1 to N-1; C is an arbitrary integer.
8. display device as claimed in claim 5 is characterized in that, described decomposition original-gray image step is carried out according to following condition:
For coordinate be (X, some Y):
If this be white, then all the page or leaf put white, otherwise,
If mod ((Y)/N)=k, then, this point from mod ((k+l+c)/N) page or leaf to mod ((k+m+c)/N) page or leaf put blackly, all the other pages are put white; Wherein, mod is complementation; M answers gray-scale displayed progression for this point, from 1 to N-1; C is an arbitrary integer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96103075 CN1069141C (en) | 1996-03-22 | 1996-03-22 | Method and device for displaying multi-stage grey scale for single color lattice LCD displaying screen |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96103075 CN1069141C (en) | 1996-03-22 | 1996-03-22 | Method and device for displaying multi-stage grey scale for single color lattice LCD displaying screen |
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| Publication Number | Publication Date |
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| CN1161465A true CN1161465A (en) | 1997-10-08 |
| CN1069141C CN1069141C (en) | 2001-08-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 96103075 Expired - Fee Related CN1069141C (en) | 1996-03-22 | 1996-03-22 | Method and device for displaying multi-stage grey scale for single color lattice LCD displaying screen |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101533633B (en) * | 2003-09-04 | 2011-05-18 | 富士通株式会社 | Display element drive method |
| CN109272910A (en) * | 2018-10-31 | 2019-01-25 | 武汉精立电子技术有限公司 | A kind of rectangle cross grey menu component generation system and method based on ARM |
-
1996
- 1996-03-22 CN CN 96103075 patent/CN1069141C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101533633B (en) * | 2003-09-04 | 2011-05-18 | 富士通株式会社 | Display element drive method |
| CN109272910A (en) * | 2018-10-31 | 2019-01-25 | 武汉精立电子技术有限公司 | A kind of rectangle cross grey menu component generation system and method based on ARM |
| CN109272910B (en) * | 2018-10-31 | 2022-04-29 | 武汉精立电子技术有限公司 | ARM-based rectangular cross gray scale picture component generation system and method |
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| Publication number | Publication date |
|---|---|
| CN1069141C (en) | 2001-08-01 |
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