CN101436397B - Method for controlling display device - Google Patents
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- CN101436397B CN101436397B CN2007101867729A CN200710186772A CN101436397B CN 101436397 B CN101436397 B CN 101436397B CN 2007101867729 A CN2007101867729 A CN 2007101867729A CN 200710186772 A CN200710186772 A CN 200710186772A CN 101436397 B CN101436397 B CN 101436397B
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Abstract
The invention discloses a method for controlling a display device. The method comprises the following steps: receiving an input video image which is provided with a first breadth length ratio and contains a plurality of effective scanning lines; controlling the display device in a first display area to display a plurality of background scanning lines according to a first scanning line frequency; and according to the effective scanning lines, controlling the display device in a second display area to display an output image according to a second scanning line frequency, wherein the output image is provided with a second breadth length ratio. The second breadth length ratio is equal to the first breadth length ratio substantially, and the second scanning line frequency is smaller than the first scanning line frequency substantially.
Description
Technical field
The present invention relates to the broadcast of video data, refer to a kind of inputted video image display-apparatus control method identical of keeping especially with the breadth length ratio of output image.
Background technology
Display unit (for example TV, LCD display, plasma display panel, projector ...) can be used to show still image or dynamic video, is one of modal electronic installation now.
Different video formats can have different resolution (resolution) and breadth length ratio (aspect ratio) usually, is example with VGA (Video Graphics Array) form, and its resolution and breadth length ratio are respectively 640*480 and 4: 3.The resolution of SXGA (Super Extended Graphics Array) and breadth length ratio then are respectively 1280*1024 and 5: 4.Be different from the resolution of display unit under the situation of resolution of its received vision signal, must the received inputted video image of first convergent-divergent (scaling), just can carry out correct video image and play.
Under most situation, video scaling can be kept full frame as far as possible and show.For instance, if the resolution of inputted video image is 640*480, the resolution of display unit is 1280*1024, and then for full frame shows, the horizontal part branch of input picture is exaggerated 2 times, and vertical component then can be exaggerated 2.133 times.By suitable controlling mechanism, this kind kept the scalable manner of full frame demonstration need not use too big temporarily providing room, can keep the balance between input traffic and the output display data stream.Yet, problem (for example the object in the output image has the problem that narrows down or broaden) but can take place on the displaying ratio of video.
If it is constant to keep breadth length ratio, then level is necessary identical with vertical zoom ratio, and remaining areas then replaces with specific background color on the display unit.For instance, if the resolution of inputted video image is 640*480, the resolution of display unit is 1280*1024, then the level and the vertical component of inputted video image all can be amplified 2 times, become the resolution of 1280*960, add each background scans line of 32 of top and below, promptly constituting resolution is the final output picture of 1280*1024.In this kind practice, the output timing of known display unit (timing) can be " the demonstration time of keeping each bar horizontal scanning line is identical ", that is, display unit shows each bar scan line institute's time spent in 64 background scans lines, can be same as to show each bar scan line institute's time spent in 960 output scanning lines (comprising image information).Yet, in this kind practice, the situation of overflow (overflow) or vacant (underflow) occurs for fear of video data stream, all must use bigger temporarily providing room usually, for example use more scan line buffer (line buffer) or frame buffer (frame buffer).And this measure meeting significantly increases system cost, is not that the situation of seeing is found pleasure in by manufacturer.
Summary of the invention
Therefore one of purpose of the present invention is to provide a kind of and can uses less temporarily providing room, can keep the inputted video image display-apparatus control method identical with the breadth length ratio of output image.
Embodiments of the invention disclose a kind of in order to control the method for a display unit.The method includes the steps of: receive an inputted video image, this inputted video image has one first breadth length ratio, and comprises many effective scanning lines; Control this display unit and show many background scans lines with one first scanning line frequency in one first viewing area; And according to these effective scanning lines, control this display unit and show an output image in one second viewing area with one second scanning line frequency, this output image has one second breadth length ratio.Wherein this second breadth length ratio equals this first breadth length ratio in fact, and this second scanning line frequency is in fact less than this first scanning line frequency.
Description of drawings
Fig. 1 is the embodiment flow chart in order to the method for controlling a display unit proposed by the invention.
Fig. 2 is three examples of the final picture of exporting of display unit of the present invention.
The reference numeral explanation
210,230,250 final pictures
211,231,251 first viewing areas
213,233,253 second viewing areas
Embodiment
See also Fig. 1, Fig. 1 is the embodiment flow chart of method in order to the control display unit proposed by the invention.It comprises following steps:
Step 110: begin to receive an inputted video image.This inputted video image has one first breadth length ratio,
And comprise many effective scanning lines; These effective scanning lines of this inputted video image have a three scan line frequency.
Step 130: control this display unit and show many background scans lines with one first scanning line frequency in one first viewing area.
Step 150:, control this display unit and show an output image with one second scanning line frequency in one second viewing area according to these effective scanning lines.This output image has one second breadth length ratio;
This second breadth length ratio equals this first breadth length ratio in fact; This second scanning line frequency is in fact less than this first scanning line frequency.
Below, each step of above-mentioned flow chart will be described with an embodiment.In this embodiment, this inputted video image meets the VGA form, and its resolution is 640*480, so this first breadth length ratio is 4: 3, these effective scanning lines add up to 480.Except these effective scanning lines, comprise 24 invalid scan lines in this inputted video image in addition.At frame rate is under the situation of 76Hz, and this three scan line frequency equals 38.3kHz.In addition, the resolution of this display unit is 1280*1024.In order to keep breadth length ratio, level and vertical component with this inputted video image in this example all amplify twice, so in this second viewing area the resolution of the shown output image that goes out be 1280*960 (in other words, this output image comprises 960 output scanning lines), second breadth length ratio is 4: 3.Then comprise 1024-960=64 bar background scans line as for this first viewing area.
In the present embodiment, control this display unit, so that its first scanning line frequency that shows these 64 background scans lines is greater than second scanning line frequency that shows these 960 output scanning lines.This kind practice has a benefit, and the data throughput (throughput) that can allow this display unit export these 960 output scanning lines exactly is matched with the data throughput that this display unit receives these 480 effective scanning lines as far as possible.Thus, can significantly reduce required temporarily providing room, and the required whole cost of reduction system.
The practice by above embodiment, used one first o'clock segment length if receive these 480 effective scanning lines, then under preferable situation, this display unit shows that employed one second o'clock segment length of these 960 output scanning lines can level off to (or being equal to) this first o'clock segment length.Because these effective scanning lines add up to 480, this three scan line frequency equals 38.3kHz, so this first o'clock segment length equals 480* (1/38.3), is about 12.5ms.Equal under the situation of this first o'clock segment length in this second o'clock segment length, this second scanning line frequency will equal 960/12.5, be about 76.6kHz.In other words, the ratio that the sum 960 of these output scanning lines and the sum of these effective scanning lines are 480, can equal the ratio (in this example, these two ratios all equal 2) between this second frequency scanning line frequency 76.6kHz and this three scan line frequency 38.3kHz in fact.
With the example of a LCD Display Panel as this display unit.Generally speaking, when LCD face version need be exported the one scan line, all must latch (latch) scan-line data earlier corresponding to this scan line, could correctly demonstrate this scan line, that is to say that every the need shows a scan line, just need latch scan line corresponding scanning beam data.Yet in the practice shown in Figure 1, in these shown in step 130 background scans lines, each bar background scans line can be all corresponding to identical scan-line data, so the action of latching only need be carried out once getting final product.Therefore, step 130 can more be subdivided into following two sub-steps:
Step 131: latch corresponding to one of them background scans line data of these background scans lines.
Step 133: repeat to export this background scans line data with this first scanning line frequency, so that this display unit shows these background scans lines in this first viewing area.
In this example, because latching the action of background scans line data only carries out once in step 131, afterwards in step 133, only show these background scans lines by repeating to export the background scans line data that latched, therefore, can reduce the time that shows that each bar background scans line is used up, and reach the purpose of " allowing this first scanning line frequency " really in fact greater than this second scanning line frequency.In other words, in this first viewing area, show the time that each bar background scans line is used up exactly, can be less than in this second viewing area, showing the time that each bar output scanning line is used up.
See also Fig. 2, Fig. 2 is three examples of the final picture of exporting of this display unit.In final output picture 210, second viewing area 213 is positioned at the below of first viewing area 211; In final output picture 230, the top of second viewing area 233 and below all belong to first viewing area 231; In final output picture 250, second viewing area 253 is positioned at the top of first viewing area 251.Though final output picture 230 these examples can provide the user visual experience preferably, but because first viewing area 231 has been divided into two sub regions up and down, need carry out twice so latch the action of background scans line data (corresponding to single background scans line), and need the more time.
Note that flow chart shown in Figure 1 only for an example of the present invention, in fact step 110,130, and 150 might not be carried out according to order shown in Figure 1.Using other kind order to come execution in step 110,130, reaching 150 also is the feasible practice.
The above only is preferred embodiment of the present invention, and all equalizations of being made according to the present patent application claim change and revise, and all should belong to covering scope of the present invention.
Claims (7)
- One kind control one display unit method, it comprises:Receive an inputted video image, this inputted video image has one first breadth length ratio, and comprises many effective scanning lines;Control this display unit and show many background scans lines with first scanning line frequency in one first viewing area; AndAccording to these effective scanning lines, to control this display unit and show an output image with one second scanning line frequency in one second viewing area, this output image has one second breadth length ratio;Wherein this second breadth length ratio equals this first breadth length ratio in fact, and this second scanning line frequency is in fact less than this first scanning line frequency.
- 2. the method for claim 1 shows that wherein the step of this output image comprises:Control this display unit and show this output image with one second o'clock segment length, this second o'clock segment length equals to receive employed one first o'clock segment length of these effective scanning lines in fact.
- 3. the method for claim 1, wherein these effective scanning lines in this inputted video image have a three scan line frequency, this output image comprises many output scanning lines, ratio between the sum of these output scanning lines and the sum of these effective scanning lines equals the ratio between this second scanning line frequency and this three scan line frequency in fact.
- 4. the method for claim 1 shows that wherein the step of these background scans lines comprises:Latch corresponding to one of them background scans line data of these background scans lines; AndRepeat to export this background scans line data with this first scanning line frequency, so that this first viewing area shows these background scans lines.
- 5. the method for claim 1, wherein this second viewing area is positioned at the below of this first viewing area.
- 6. the method for claim 1, wherein the top of this second viewing area and below all belong to this first viewing area.
- 7. the method for claim 1, wherein this second viewing area is positioned at the top of this first viewing area.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101867729A CN101436397B (en) | 2007-11-16 | 2007-11-16 | Method for controlling display device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101867729A CN101436397B (en) | 2007-11-16 | 2007-11-16 | Method for controlling display device |
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| CN101436397A CN101436397A (en) | 2009-05-20 |
| CN101436397B true CN101436397B (en) | 2011-12-07 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1034838A (en) * | 1987-07-27 | 1989-08-16 | 通用电气公司 | Compatible wide-screen television system |
| US4951149A (en) * | 1988-10-27 | 1990-08-21 | Faroudja Y C | Television system with variable aspect picture ratio |
| CN1051834A (en) * | 1989-09-15 | 1991-05-29 | 德国索姆森-布兰特有限公司 | Television transmission system |
| CN1094210A (en) * | 1993-04-21 | 1994-10-26 | 汤姆森消费电子有限公司 | The subtitle region of management shows |
| JP2001306045A (en) * | 2000-04-26 | 2001-11-02 | Matsushita Electric Ind Co Ltd | Screen display control method and device |
| TWI268473B (en) * | 2004-11-04 | 2006-12-11 | Realtek Semiconductor Corp | Display controlling device and controlling method |
-
2007
- 2007-11-16 CN CN2007101867729A patent/CN101436397B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1034838A (en) * | 1987-07-27 | 1989-08-16 | 通用电气公司 | Compatible wide-screen television system |
| US4951149A (en) * | 1988-10-27 | 1990-08-21 | Faroudja Y C | Television system with variable aspect picture ratio |
| CN1051834A (en) * | 1989-09-15 | 1991-05-29 | 德国索姆森-布兰特有限公司 | Television transmission system |
| CN1094210A (en) * | 1993-04-21 | 1994-10-26 | 汤姆森消费电子有限公司 | The subtitle region of management shows |
| JP2001306045A (en) * | 2000-04-26 | 2001-11-02 | Matsushita Electric Ind Co Ltd | Screen display control method and device |
| TWI268473B (en) * | 2004-11-04 | 2006-12-11 | Realtek Semiconductor Corp | Display controlling device and controlling method |
Non-Patent Citations (1)
| Title |
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| 王真行.全球性高清晰度电视的射频频率要求.《电视技术》.1993,(第06期),49-54. * |
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| CN101436397A (en) | 2009-05-20 |
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