Patent Application
20060024023
This application claims the benefit of Taiwan application Serial No. 93122626, filed Jul. 28, 2004, the subject matter of which is incorporated herein by reference.
1. Field of the Invention
The invention relates in general to a video playback system and the video playing method thereof, and more particularly to a video playback system capable of reducing power consumption, and the video playing method thereof.
2. Description of the Related Art
Due to technological advancements, electronics companies nowadays are not only directing their product development towards light-weight, thin, short, and small components, but are also emphasizing on developing products that are more power conserving. Especially with regards to portable personal entertainment systems, such as portable DVD players, consumers rely primarily on the internal batteries to run the players, and because of such circumstances, it is particularly important that power consumption is considered in the design of the products.
The control circuit 130 includes a sync separator 131, a timing controller 132, and an image decoder 134. The sync separator 131 is for receiving the control timing C1 output from the video player 110, then separating the control timing into different sync timings, and finally outputting the control timing C1. The image decoder 134 is for receiving image data A1, then digitizing and decoding image data A1, and finally outputting image data D. The timing controller 132 then converts image data D into analog pixel data P, and outputs analog pixel data P according to timing signal C2.
Since conventional displays, such as CRT televisions having control circuit 130 and display panel 180 as described above, are only built to receive analog signals. Thus, the video player 110 has to encode the internally processed digital signals into analog image data A1 before transferring. Consequently, conventional video playback systems must perform multiple analog-to-digital (A/D) and digital-to-analog (D/A) conversions, and resulting in signal data loss, overuse of power consumption, and unnecessary waste of costs and resources etc.
To better illustrate, the image encoder 116 for example first performs a D/A conversion, then the image decoder 134 performs a A/D conversion, then the timing controller 132 again performs another D/A conversion. While performing A/D or D/A signal conversions, a greater amount of power is consumed, and since conventional video playback systems require signals to go through multiple levels of A/D and D/A conversions, power consumption can not be effectively reduced.
It is therefore an object of the invention to provide a video playback system capable of reducing power consumption, and the video playing method thereof.
The International Radio Consultative Committee (CCIR) interfaces are commonly used as the interface between video decoders and display control ICs (Scaler, Timing Controller), for applying internally to the display system. The CCIR interface under present invention is being implemented, in novelty, between the video playback system and the display system. By such implementation, the D/A conversions are no longer required in video playback systems, and in digital display systems, the A/D conversions are no longer required as well. Thus, the system costs can be effectively reduced, while arriving at better picture quality. Similarly, for analog playback systems, by eliminating the D/A conversion originally required in video players, better picture quality can also be achieved.
The invention achieves the above-identified object by providing a video playback system, including a video player, a control circuit, and a display panel. The video player is for outputting a CCIR video. The control circuit includes a CCIR transformer and a timing controller. The CCIR transformer if for receiving and converting the CCIR video into image data. The timing controller is for receiving image data, and outputting a control timing and image data. The display panel is for receiving image data and control timing, and outputting picture frames accordingly.
The invention achieves another above-identified object by providing a method of displaying video. First, the CCIR transformer is utilized to receive the CCIR video and transform the CCIR video to image data. Next, utilizing the timing controller, image data is received, and then pixel data and a control timing are outputted. Then, according to pixel data and the control timing, picture frames are displayed on the display panel.
Other objects, features, and advantages of the invention will become apparent from the following detailed description of the preferred but non-limiting embodiments. The following description is made with reference to the accompanying drawings.
Video player 220 includes a MPEG decoder 212, a video processor 214, and an image encoder 216. MPEG decoder 212 is for receiving and decoding encoded data into decoded data for output. The decoded data are for instance data read from a DVD. Video processor 214 receives the decoded data and outputs the video data accordingly, then image encoder 216 in turn receives the video data and outputs a CCIR video D1 in digital format. The CCIR video D1 is for example a CCIR 601/656 4:2:2 of YCbCr format.
Control circuit 230 includes a CCIR transformer 234 and a timing controller 232. CCIR transformer 234 receives the CCIR video D1, then transforms CCIR video D1 into image data D2, and extracts control timing C1 from image data D2. Timing controller 232 then receives image data D2 and control timing C1, and outputs pixel data P and control timing C2 accordingly.
The difference between the embodiment of present invention (
In addition, for the CCIR transformer according to the embodiment of present invention, the input video signals are not required to undergo data conversions through ADCs, thus data loss resulting from analog to digital conversions can be prevented, and data can be presented as picture frames in the most realistic form.
Furthermore, the brightness, hue and gamut adjustments originally handled by conventional image processors can now be performed by video player 220. Therefore, functions required for CCIR transformer 234 can be greatly reduced, which directly translates to the reduction of die size and manufacturing costs
The display panel 280 according to the embodiment of the invention can be in analog format or in digital format. When display panel 280 displays in analog format, pixel data P output by timing controller 232 is also in analog format, such as in interlaced RGB format; when display panel 280 displays in digital format, pixel data is also in digital format, such as in LVDS, DV1 etc.
The video play back system as according to above mentioned embodiment of the present invention can be concluded to have the following advantages:
While the invention has been described by way of example and in terms of a preferred embodiment, it is to be understood that the invention is not limited thereto. Rather, it is intended to cover various modifications and similar arrangements and procedures, and the scope of the appended claims therefore should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements and procedures.
| Number | Date | Country | Kind |
|---|---|---|---|
| 93122626 | Jul 2004 | TW | national |
