CN100384248C - Control method and device of LCD controller - Google Patents
Control method and device of LCD controller Download PDFInfo
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- CN100384248C CN100384248C CNB031429742A CN03142974A CN100384248C CN 100384248 C CN100384248 C CN 100384248C CN B031429742 A CNB031429742 A CN B031429742A CN 03142974 A CN03142974 A CN 03142974A CN 100384248 C CN100384248 C CN 100384248C
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000015654 memory Effects 0.000 claims abstract description 65
- 239000000872 buffer Substances 0.000 claims abstract description 59
- 230000008859 change Effects 0.000 claims abstract description 29
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 9
- 230000003139 buffering effect Effects 0.000 claims abstract description 4
- 238000006243 chemical reaction Methods 0.000 claims description 17
- 238000012546 transfer Methods 0.000 claims description 4
- 238000013507 mapping Methods 0.000 description 24
- 230000003287 optical effect Effects 0.000 description 11
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
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- Liquid Crystal Display Device Control (AREA)
Abstract
The present invention provides a method and a device which can display on a liquid crystal display panel and can not change the resolution of the original image. The method and the device use the same linear type buffering memory body which can be mutually in contact with a digital signal processor. A display image can be commonly proportioned by the digital signal processor, and thus, the image can be displayed at the upper side or the lower side of a liquid crystal display panel within a dimension specification. Due to the fact that the page frame rate of the original image is the same as the page frame rate of the liquid crystal display panel. Therefore, the present invention does not need extra page frame buffers. An image page frame buffering memory body can be written on the liquid crystal display panel after panel vertical synchronization pulses every other time, and vertical synchronization time pulses are converted to a left side or a right side within a time region in order to centralize an image of the liquid crystal display panel.
Description
Technical field
The invention relates to a kind of control method and device of LCD controller, refer to a kind of not changing the raw video resolution and not having device and its control method of page frame buffer memory on the display panels that be shown in especially.This method and apparatus uses identical buffer memory, with show image; And this buffer memory can connect each other with the digital signals processor.
Background technology
Now, but traditional LCD controller is used the mapping of resize ratio.Shown in Figure 1 is one to have the mapping of the image 110 of 640 * 480 pixels, and this mapping is shown in one to have on the panel of LCD 120 of 1024 * 768 pixels.But this figure is showing the image of this resize ratio, to be fit to the demonstration of this LCD.Among the figure, the starting point of this image and end point are mapping point 130 and 140.If traditional circuit needs higher pulse frequency with display frame on LCD will carry out the function of above-mentioned resize ratio the time.Proportional-controllable digital signals processor can provide higher pulse frequency, this digital signals processor can preserve as the snapshot of oneself as the time frame speed.And the common executive mode of this kind needs a plurality of orthoscopic buffer memories (linebuffer), to store temporary data.
Fig. 2 shows the common executive mode of LCD that can't resize ratio.With this example, the data that a page frame buffer memory can be seized whole image page frame.Therefore, image 210 has 768 * 640 resolution, can be on panel of LCD 220 with 1024 * 768 resolutions demonstrate lattice point Anywhere.The starting point of this image and the mapping point of end point 230 and 240 promptly are presented among Fig. 2.And the cited case is to express at a page frame buffer memory among the figure, and common technique is required to be to have comprised which content.If its resolution of a raw video is 640 * 480, and LCD is 1024 * 768, and then original page frame pulse will be defined as 480 horizontal synchronization pulse (Hsyncpulse under the condition that does not have the page frame buffer memory; Horizontal synchronization pulse) pulse of signal, and LCD image page frame is 768 horizontal synchronization pulse signals.Because the page frame pulse of raw video must equal the pulse of whole LCD page frame, the necessary reason of using the page frame buffer memory that Here it is.Yet its page frame pulse of image that can't adjust displaying ratio is less than the raw video shown in Fig. 1,2 significantly, and the difference of the numerical value by their horizontal synchronization pulses can be found out.
United States Patent (USP) case numbers 5,537,128 (Keene, et al.) " a kind of memory body of sharing that is applied to separate type panel and liquid crystal display systems " (Shared Memory for Split-Panel, LCD DisplaySystems) describes a kind of memory body sharing method at the separate type display panels.This method provides the memory body of greater efficiency to share use with the video signal processor between the LCD driver in the conventional system and cathode ray tube driver.
United States Patent (USP) case numbers 5, " a kind of method of importing and exporting the device of optical image and have the electronics video signal of compressible or expansion optical image " (the Apparatus for Inputting andOutputting an Optical Image with Means for Compressing or expanding theElectrical Video Signal of the Optical Image) of 712,681 (Suh) disclosed a kind of device and method compressible or expansion electron image data of importing and exporting optical image.Those circuits demonstrate the image of seizing on LCD.
United States Patent (USP) case numbers 5,712, " a kind of have compressible or enlarge the device of importing and export optical image of method of the electronics video signal of optical image " (Apparatus for Inputting andOutputting an Optical Image with Means for Compressing or expanding theElectrical Video Signal of the Optical Image) of 681 (Suh) discloses a device and can import and export optical image, and a kind of compressible or enlarge the method for the electronics video signal of optical image.Those circuits demonstrate the image of seizing on LCD.
" memory controller of LCD " of United States Patent (USP) case number 6,049,322 (Yoshikawa et al) disclosed a kind of memory controller that designs at LCD.This device makes the original drive of LCD to operate under the frequency that is lower than the orthoscopic buffer memory.
Summary of the invention
Main purpose of the present invention is to be to provide a kind of method and apparatus not have a raw video of proportionality to show on LCD.
Secondary objective of the present invention is to be to provide a kind of LCD of general lower pulse frequency, but and the method for use resize ratio show.
A further object of the present invention be not use the page frame buffer memory and can be on LCD show image.
For achieving the above object, the technical solution used in the present invention is, a kind of method that shows a raw video and do not change the raw video resolution on panel of LCD at first is provided, be that raw video is divided on even number image ranks and odd number image ranks and the display panels of videoing respectively, it comprises step:
Change more than one even number image ranks to a plurality of orthoscopic buffer memories;
Change the driver of a plurality of panel of LCD that export this panel of LCD first half to of this orthoscopic buffer memory;
Shown end is skipped the vertical synchronizing signal of a LCD in these even number image ranks;
Change a plurality of odd number image ranks to a plurality of orthoscopic buffer memories;
Change the driver of a plurality of panel of LCD that export this panel of LCD Lower Half to of this orthoscopic buffer memory;
Make the data blank of its odd number image of Lower Half of this LCD.
Next provides a kind of and has shown a raw video and do not changed the raw video resolution and the method for tool one image buffer memory not that it comprises step on panel of LCD:
In between per two general vertical synchronization time pulse signal periodic region, skipping once on one vertical sync pulse;
Change the driver that a plurality of even numbers reflection image ranks to a plurality of orthoscopic bufferings are forgotten memory body and changed a plurality of panel of LCD that export this panel of LCD first half to of this straight line buffer memory, with a plurality of even number ranks of showing this original reflection to show a plurality of even number ranks of this raw video; To the orthoscopic buffer memory, this orthoscopic buffer memory exports the driver of this LCD Lower Half to by conversion odd number image ranks,
Make the data blank of its odd number image of Lower Half of this LCD; And
Shift vertical sync pulse, with the middle position of this image transfer to the liquid crystal display displays zone.
A kind of device that can show a raw video on a panel of LCD and not change the raw video resolution is provided once more, and it comprises:
More than one even number image ranks of one conversion are to the device of a plurality of orthoscopic buffer memories;
The device of the driver of a plurality of panel of LCD that export this panel of LCD first half to of one this orthoscopic buffer memory of conversion;
One in these even number image ranks shown end skip the device of the vertical synchronizing signal of a LCD;
The a plurality of odd number image ranks of one conversion are to the device of a plurality of orthoscopic buffer memories;
The device of the driver of a plurality of panel of LCD that export this panel of LCD Lower Half to of one this orthoscopic buffer memory of conversion;
One makes the device of data blank of its odd number image of Lower Half of this LCD.
Provide a kind of at last and can on a panel of LCD, show a raw video and not change the raw video resolution and the device of tool one image buffer memory not that it comprises:
One is carried out at the device of skipping on the vertical sync pulse under per 2 twice general vertical synchronization time signal cycles;
One shows the device of the even number ranks of this raw video, and it is to realize by changing a plurality of even number image ranks to a plurality of orthoscopic buffer memories and the driver of changing a plurality of panel of LCD that export this panel of LCD first half to of this straight line buffer memory;
One makes the device of data Lower Half blank of its odd number image of Lower Half of this LCD, its be by conversion odd number image ranks to the orthoscopic buffer memory, this orthoscopic buffer memory exports that the driver of this LCD Lower Half realizes to;
One shifts this vertical sync pulse to shift the device of this image to the centre of the viewing area of LCD.
As for detailed construction of the present invention, application principle, effect and effect, then the explanation of doing with reference to following adjoint can be understood completely:
Description of drawings
Fig. 1 is the mapping of the proportion adjustable of a prior art;
Fig. 2 is the mapping of the non-proportion adjustable of a prior art.
The mapping algorithm of the non-proportion adjustable of step 1 of the present invention among Fig. 3.
Fig. 4 is the mapping algorithm of the non-proportion adjustable of step 2 of the present invention.
Fig. 5 is the mapping algorithm of the non-proportion adjustable of step 3 of the present invention.
Fig. 6 is vertical frequency range, horizontal synchronization pulse icon.
Fig. 7 is how the shifting one's position of its vertical frequency range of image that is presented at LCD moves.Graphic figure number explanation: 110-image; The 120-panel of LCD; The 130-mapping point; The 140-mapping point; The 210-image; The 220-panel of LCD; The 230-mapping point; The 240-mapping point; 310-even number image ranks; The 330-mapping point; The 340-mapping point; The 350-mapping point; The 410-raw video; 420-even number image ranks; 430-odd number image ranks; The 440-panel of LCD; The 510-raw video; The non-proportional-controllable image of 520-; The 530-panel of LCD; The 540-mapping point; The 550-mapping point; The 560-starting point; The 570-end point; 610-raw video buffer memory firsthand information; 615-even number page frame vertical synchronizing signal; 620-horizontal synchronization firsthand information 625-vertical synchronizing signal; 630-vertical synchronization firsthand information 635-even number page frame vertical synchronizing signal; 640-panel of LCD data; 650-horizontal synchronization panel; 655-even number page frame vertical synchronizing signal; 660-vertical synchronization panel; 670-even number image data; 680-odd number image data; 690-even number data; 691-odd number data; The 701-white space; The 703-white space; The 702-data; The 704-data; 710-even number page frame display data; The 720-LCD; The blank data of 730-; The 740-LCD; The 750-data; The 760-LCD.
Embodiment
Fig. 3 is the first step of the inventive method.Even number image ranks 310 are to map to panel of LCD.This figure shows the mapping of a non-proportional-controllable algorithm.Its number of orthoscopic buffer memory that uses at this mapping is identical with traditional proportional-controllable algorithm.Non-proportional-controllable image can be carried out and be produced to the digital signals processor on panel of LCD.The output meeting of digital signals processor is to a plurality of orthoscopic drivers, the honeycomb tissue (cells) of this orthoscopic driver drives panel of LCD.The beginning and the end point of these even number image ranks are mapping point 330 and 340, and map to panel of LCD, shown in figure three.These odd number image ranks are mapping points 350, are directly under the even number ranks.
Fig. 4 is the next procedure of the inventive method, comprises raw video 410 and panel of LCD 440.Even number image ranks 420 are revealed and can read on panel of LCD.Odd number image ranks 430 be blank maybe can't show 430.This method needs a data page frame (being the odd number page frame), and this page frame is skipped once every a frame.Because odd number image ranks are directly in abutting connection with the original ranks of even number, therefore eliminate odd-numbered scan lines row (odd scan lines) and will make the loss of data minimize.When present embodiment demonstrates the half that a non-proportional-controllable image has occupied display pannel, generally speaking, the present invention will with the common coupling of diversification size of display.Illustrate, non-proportional-controllable image may occupy 2/3rds indicator screen.Any original resolution is as if the resolution less than display, and promptly success is feasible.
Fig. 5 is last step of this method, comprises raw video 510 and panel of LCD 530.Its starting point 560 of the image of this panel of LCD is to be shown among the figure with the mapping point 540 and 550 of end point 570.Image on this panel of LCD is a non-proportional-controllable image 520.Comparison diagram 4 and Fig. 5, the transfer that image shows on panel of LCD must be noted that.Among Fig. 4, the image 420 of demonstration is transferred to the top of panel of LCD 440.Among Fig. 5, the image 520 of demonstration is the central authorities that are positioned at panel of LCD 530.Via the transfer that can finish image to the vertical wideband signal vertical synchronizationization of panel of LCD and central authoritiesization.In this Fig. 4, corresponding vertical wideband signal is to be transferred to the left side in time zone pulse graphic (time domain timing diagram).
Fig. 6 is that the time zone pulse is graphic.This figure illustrates the signal of raw video buffer memory firsthand information (sourceimage buffer data_source) 610, horizontal synchronization firsthand information (Hsync_source) 620 and vertical synchronization firsthand information (Vsync_source) 630 etc.The signal that also shows panel of LCD data (LCD panel data_panel) 640, horizontal synchronization panel (Hsync_panel) 650 and vertical synchronization panel (Vsync_panel) 660 among the figure.Even number image data 670 also is present among the figure simultaneously with odd number image data 680.Yet when odd number data 691 is blank or when demonstration, even number data 690 promptly can show.Above-mentioned situation can be by finishing every skipping of once vertical synchronizing signal 615 and 625 on display panels.When a vertical synchronizing signal is skipped, the general starting point of the upper left side of panel of LCD viewing area will can not begin the next odd number page frame of data.As a result, present even number image ranks group is still high-visible on panel of LCD.
In addition, mobile even number page frame vertical synchronizing signal 635,655 and 645 position-controllable system the position of show image.The image that moves to a left side removable demonstration in place of vertical synchronizing signal 635 upwards.
Fig. 7 more shows vertical synchronizing signal mobile be show image how to control panel of LCD move or under the position.Fig. 7 discloses the white space 701 and the 703 even number page frames 702 and 704 as demonstration of the data of demonstration again.In this figure, have three kinds of cases.With regard to case one, be vertical sync pulse and reform from blank data to the transformation of even number page frame display data 710.It is top in LCD 720 that relevant LCD image show image begins.Case two shows that vertical sync pulse occurs in the centre of blank data 730.The image of this demonstration of demonstration of related liquid crystal display image is present in the centre of LCD 740.With regard to case three, be vertical sync pulse and reform from even number display data to the transformation of blank data 750.And corresponding LCD image presented is bottom warp towards LCD 760.Fig. 6 is showing that also the frequency of LCD vertical synchronization is half of original vertical synchronizing frequency.And the horizontal synchronization signal frequency of panel of LCD 650 equals the frequency of original horizontal synchronization signal 620.Therefore, the demand of vertical synchronizing frequency is the frequency that is equal to or less than these original signals.
The present invention has advantage cheaply, because do not need extra page frame buffer memory.In addition, this circuit of carrying out the inventive method is also very simple with device.The frequency that has wherein also comprised vertical synchronizing signal has reduced by half.And Circuits System is to be used for the position of mobile vertical synchronizing signal, to set up the position that will be presented at image on the panel of LCD.
But the above only is a preferred embodiment of the present invention, is not to be used for limiting scope of the invention process.Be that the equalization that all the present patent application claims are done changes and modification, be all the contained lid of claim of the present invention.
Claims (10)
1. method that on panel of LCD, shows a raw video and do not change the raw video resolution, be that raw video is divided into even number image ranks and odd number image ranks, and on the display panels of videoing respectively, it is characterized in that: it comprises step:
Change a plurality of even number image ranks to a plurality of orthoscopic buffer memories;
Change the driver of a plurality of panel of LCD that export this panel of LCD first half to of this orthoscopic buffer memory;
Shown end is skipped the vertical synchronizing signal of a LCD in these even number image ranks;
Change a plurality of odd number image ranks to a plurality of orthoscopic buffer memories;
Change the driver of a plurality of panel of LCD that export this panel of LCD Lower Half to of this orthoscopic buffer memory;
Make the data blank of its odd number image of Lower Half of this LCD.
2. a kind of method that on panel of LCD, shows a raw video and do not change the raw video resolution as claimed in claim 1, it is characterized in that: its step more comprises: to the left side or the right side, the raw video analytical-density image that do not change of panel of LCD can be carried out moving up and down via the pulse of the vertical synchronizing signal that shifts this panel of LCD in a time zone.
3. one kind shows a raw video on panel of LCD, and does not change the raw video resolution and the method for tool one image buffer memory not, it is characterized in that: comprise step:
On a vertical sync pulse, skip once in per two general vertical synchronizing signal cycles;
Change a plurality of even number image ranks to a plurality of orthoscopic buffer memories and change the driver of a plurality of panel of LCD that export this panel of LCD first half to of this orthoscopic buffer memory, to show a plurality of even number ranks of this raw video; By changing odd number image ranks to the orthoscopic buffer memory, and change the driver that this orthoscopic buffer memory exports this LCD Lower Half to, a plurality of odd number ranks of raw video are mapped to the latter half of panel of LCD, make the data blank of its odd number image of Lower Half of this LCD; And
Shift vertical sync pulse, with the middle position of this even number image transfer to the liquid crystal display displays zone.
4. device that can show a raw video on a panel of LCD and not change the raw video resolution is characterized in that: comprising:
The a plurality of even number image ranks of one conversion are to the device of a plurality of orthoscopic buffer memories;
The device of the driver of a plurality of panel of LCD that export this panel of LCD first half to of one this orthoscopic buffer memory of conversion;
One in these even number image ranks shown end skip the device of the vertical synchronizing signal of a LCD;
The a plurality of odd number image ranks of one conversion are to the device of a plurality of orthoscopic buffer memories;
The device of the driver of a plurality of panel of LCD that export this panel of LCD Lower Half to of one this orthoscopic buffer memory of conversion;
One makes the device of data blank of its odd number image of Lower Half of this LCD.
5. a kind of device that can show a raw video on a panel of LCD and not change the raw video resolution as claimed in claim 4 is characterized in that: more comprise:
One device can be via the pulse of the vertical synchronizing signal that shifts this panel of LCD in a time zone to the left side or the right side, and the raw video analytical-density image that do not change of panel of LCD is carried out moving up and down.
6. a kind of device that can show a raw video on a panel of LCD and not change the raw video resolution as claimed in claim 4, it is characterized in that: described device need not possess a page frame buffer.
7. a kind of device that can on a panel of LCD, show a raw video and not change the raw video resolution as claimed in claim 4, it is characterized in that: described conversion even number image ranks is characterized in that: more comprise to the device of a plurality of orthoscopic buffer memories:
One device, be utilize between the orthoscopic buffer memory of output and this panel of LCD of buffer memory of this raw video directly by being connected, to carry out this conversion.
8. a kind of device that can show a raw video on a panel of LCD and not change the raw video resolution as claimed in claim 4 is characterized in that: these odd number image ranks of described conversion to the device of a plurality of orthoscopic buffer memories more comprises:
One device is direct connection of utilizing between the orthoscopic buffer memory of output and this panel of LCD of buffer memory of this raw video, to carry out this conversion.
9. a kind of device that can show a raw video on a panel of LCD and not change the raw video resolution as claimed in claim 4 is characterized in that: the device of the driver of a plurality of panel of LCD that export this panel of LCD first half to of this orthoscopic buffering note body of described conversion more comprises:
One device is direct connection of utilizing between the driver of this orthoscopic buffer memory and this panel of LCD, to carry out this conversion.
10. one kind can show a raw video and not change the raw video resolution and the device of tool one image buffer memory not on a panel of LCD, it is characterized in that: comprising:
One is carried out at the device of skipping on the vertical sync pulse at per two general vertical synchronizing signals under the cycle;
One shows the device of the even number ranks of this raw video, and it is to realize by changing a plurality of even number image ranks to a plurality of orthoscopic buffer memories and the driver of changing a plurality of panel of LCD that export this panel of LCD first half to of this orthoscopic buffer memory;
A plurality of odd number ranks of raw video are mapped to the device of the latter half realization of panel of LCD, its be by conversion odd number image ranks to the orthoscopic buffer memory, and change that driver that this orthoscopic buffer memory exports this LCD Lower Half to realizes;
One makes the device of data blank of its odd number image of Lower Half of this LCD;
One shifts this vertical sync pulse to shift the device of this even number image to the centre of the viewing area of LCD.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB031429742A CN100384248C (en) | 2003-06-13 | 2003-06-13 | Control method and device of LCD controller |
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| CNB031429742A CN100384248C (en) | 2003-06-13 | 2003-06-13 | Control method and device of LCD controller |
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| CN1567403A CN1567403A (en) | 2005-01-19 |
| CN100384248C true CN100384248C (en) | 2008-04-23 |
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| CNB031429742A Expired - Fee Related CN100384248C (en) | 2003-06-13 | 2003-06-13 | Control method and device of LCD controller |
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| CN102054447B (en) * | 2009-11-10 | 2012-10-03 | 北京京东方光电科技有限公司 | Liquid crystal display driving method and driving circuit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08317344A (en) * | 1995-03-16 | 1996-11-29 | Hitachi Ltd | Display device |
| US5699076A (en) * | 1993-10-25 | 1997-12-16 | Kabushiki Kaisha Toshiba | Display control method and apparatus for performing high-quality display free from noise lines |
| JP2001194642A (en) * | 2000-01-12 | 2001-07-19 | Nec Viewtechnology Ltd | Blanking device of liquid crystal display, and its blanking method |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5699076A (en) * | 1993-10-25 | 1997-12-16 | Kabushiki Kaisha Toshiba | Display control method and apparatus for performing high-quality display free from noise lines |
| JPH08317344A (en) * | 1995-03-16 | 1996-11-29 | Hitachi Ltd | Display device |
| JP2001194642A (en) * | 2000-01-12 | 2001-07-19 | Nec Viewtechnology Ltd | Blanking device of liquid crystal display, and its blanking method |
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