CN101420540B

CN101420540B - Digital television system having liquid crystal television controller and digital television back-end controller

Info

Publication number: CN101420540B
Application number: CN200710167901XA
Authority: CN
Inventors: 谢明展; 谢建华; 龚金盛
Original assignee: Realtek Semiconductor Corp
Current assignee: Realtek Semiconductor Corp
Priority date: 2007-10-26
Filing date: 2007-10-26
Publication date: 2011-11-09
Anticipated expiration: 2027-10-26
Also published as: CN101420540A

Abstract

A digital television system comprises a LCD TV controller and a LCD TV back end controller. The LCD TV controller is used for receiving a video signal which comes from an analog television signal source, and is demodulated and decoded, controlling and processing the decoding, metrization, image quality, coloring and the like of the video signal according to the output standard of an LTD TV. The LCD TV back end controller is used for receiving the video signal which comes from a digital television signal source and is demodulated, outputting the video signal to the LCD TV controller after the video signal is decoded; after the LCD TV controller controls and processes the decoding, metrization, image quality, coloring and the like of the video signal according to the display format of the LCD TV, the generated video signal is transmitted back to the LCD TV back end controller. The LCD TV back end controller processes the video signal (a display device displays control) and again outputs the processed video signal to a liquid crystal panel which displays a corresponding video image. The digital television system can effectively avoid the shortcomings that the follow-up processing brings about negative effect or interference on (the display device displaying control).

Description

The digital television system of side controller after tool LCD TV controller and the Digital Television

Technical field

The present invention relates to a kind of digital television system, particularly relate to a kind of digital television system with a LCD TV controller chip and a Digital Television rear end controller chip.

Background technology

Digital television system is a kind of new radiovision science and technology, its operation principle is with the employed analog signal of present TV programme, by treatment technologies such as multiplexed, modulation, convert digital signal to broadcast away, therefore, the literal of the digital television program that Digital Television is play or image information, all formed, make the user when watching digital television program, as using a computer by digital signal such as 0 and 1, can be according to self needs, picture that access or adjustment are watched and data.At present, general user desires to watch that at home the mode of digital television program has two, one, buys Digital Television (DigitalTelevision is hereinafter to be referred as DTV), replacing old simulated television, and installs the UHF antenna additional; The 2nd, still use old simulated television (Analog Television is hereinafter to be referred as ATV), but need to buy set-top box (Set-Top Box is hereinafter to be referred as STB), and install the UHF antenna additional, with as conversion of signals.

Generally speaking, the control circuit of DTV, consult shown in Figure 1, comprise an ATV tuner (Tuner) 110, be used to receive the ATV signal, this ATV tuner 110 is connected with an ATV demodulator of PM signal PM (Demodulator) 111, this ATV demodulator of PM signal PM 111 is used for the ATV signal is carried out demodulation, the audio signal and the vision signal demodulation that comprise in the ATV signal are come out, be sent to an audio decoder (Audio Decoder) 112 and one Video Decoder (Video Decoder) 113 respectively, respectively audio signal and vision signal are decoded respectively by this two decoder 112 and 113, the audio signal of finishing decoding is sent to relevant sound effect control circuit (not shown), after the filtering and processing and amplifying via this sound effect control circuit, play back by loudspeaker again, the vision signal of finishing decoding is then via the interface of the eight bit data data transformat of a CCIR656, be sent to a LCD TV controller (LCD TVcontroller) 131, this LCD TV controller 131 is according to the output specification of LCD TV, received vision signal is controlled, comprise deinterleaveization (de-interlacing), convergent-divergent (scaling), processing such as image quality and color, again via a Low Voltage Differential Signal (Low VoltageDifferential Signaling, hereinafter to be referred as LVDS) interface, be sent to a liquid crystal panel (LCDPanel) (not shown), demonstrate corresponding video image.

Above-mentioned DTV control circuit also comprises a DTV tuner 121, be used to receive the DTV signal, this tuner 121 is connected with a DTV demodulator of PM signal PM 122, this DTV demodulator of PM signal PM 122 is used for the DTV signal is carried out demodulation, and the vision signal that demodulation is come out is sent to side controller 123 behind the DTV, this back side controller 123 is used for the vision signal of the MPEG2 that is received is controlled and handled, also comprise voice signal is decoded, and some special fonts or figure that desire on the display screen is produced carry out operations such as OSD processing, and with the vision signal that produced interface (interface) by a BT1120 specification compatibility, one High Resolution multimedia interface (High-definition MultimediaInterface, hereinafter to be referred as HDMI) or a digital video interface (Digital Visual Interface, hereinafter to be referred as DVI) etc., export this LCD TV controller 131 to, and carry out deinterleaveization in 131 pairs of vision signals of this LCD TV controller, convergent-divergent, after image quality and color etc. are handled, via a LVDS interface, be sent to this liquid crystal panel, to show corresponding video image.

The control circuit of conventional digital TV STB, consult shown in Figure 2, then comprise an ATV tuner 210, be used to receive the ATV signal, this ATV tuner 210 is connected with an ATV demodulator of PM signal PM 211,211 pairs of ATV signals of this ATV demodulator of PM signal PM carry out demodulation, the audio signal and the vision signal demodulation that comprise in the ATV signal are come out, and this audio signal and vision signal be sent to an audio decoder 212 and a Video Decoder 213 respectively, this audio signal and vision signal are decoded respectively, wherein finish the interface of the vision signal of decoding via the eight bit data data transmission of a CCIR656, be sent to side controller 223 behind the DTV, by side controller 223 behind this DTV it being carried out OSD handles, and with the vision signal that produced by a CVBS, the interface (interface) of specification compatibilities such as S-video, an one HDMI interface or a DVI interface etc., export an iconoscope (CRT) or flat-panel monitor (Flat PanelDisplay to, hereinafter to be referred as FPD, as: LCD TV, plasma television etc.), show corresponding video image.

The control circuit of this Digital Television STB also comprises a DTV tuner 221, be used to receive the DTV signal, this DTV tuner 221 is connected with a DTV demodulator of PM signal PM 222, this DTV demodulator of PM signal PM 222 is used for the DTV signal is carried out demodulation, and will finish the video of demodulation and audio signal and be sent to side controller 223 behind this DTV, this back side controller 223 is except that decoding to audio signal, and the vision signal of received MPEG2 controlled, carry out the OSD processing with some special fonts or the figure that desire on the display screen is produced, again the vision signal that is produced is passed through a CVBS, the interface of specification compatibilities such as S-video, an one HDMI interface or a DVI interface etc., export an iconoscope or flat-panel monitor to, show corresponding video image.

In the present displays such as iconoscope TV, LCD TV and plasma television, all can use the OSD treatment technology, on display, to produce some specific information that is available for users to control or figures, when controlling the changing platform or adjust effect such as volume, image quality of TV the user, can demonstrate present state on the display, therefore, in the control circuit of this display respectively, set up an OSD control chip or a built-in osd control circuit, promptly become a key Design of the information that on man-machine interface, produces.At present, the work that OSD control chip or circuit can be finished, except general when adjusting function such as TV size sound or brightness, can be with outside grid or the numerical value display setting value on television image, now integrated considerable function, function is adjusted in for example brightness, contrast, displacement etc., even comprises adjustment such as barrel shape distortion, trapezoidal distortion, parallelogram distortion, pincushion phenomenon.Generally speaking, because Digital Television rear end controller chip has stronger graphics processing engine (graphic engine), so the generation of OSD and control all are to control in the constitution device chip in the Digital Television rear end to carry out usually in television system.

It should be noted that especially because generally speaking the image of OSD all is the superiors that are positioned at picture, then see it with the angle of system design, the interlock circuit that processing OSD generates and control OSD operates should be positioned at the rear end of general image handling process as far as possible and be advisable.Especially under the situation of OSD image generation prior to the deinterleave processing; because osd information is the image of static comparatively speaking (still) normally; after then it synthesizes with the vision signal that contains displacement (motion); Shi Changhui causes the difficulty in the judgement for the displacement detecting (motion detection) of being carried out in the deinterleave processing; and make that the result of deinterleave processing is desirable not to the utmost; make picture produce the unclear problem of qualities such as image blurring or color mistake; DTV system as shown in Figure 1 is the example that the problems referred to above might take place.

Summary of the invention

Because many shortcomings of aforementioned conventional Digital Television control circuit, the inventor is according to for many years at the design and the manufacturing experience of video control chip, and the professional knowledge of being accumulated, at above-mentioned shortcoming, development and Design goes out a kind of digital television system of the present invention, the phase mat has the final stage of the DTV rear end design of Controller of osd control circuit in whole video demonstration processing links in one, function and effect with its OSD processing of effective performance, avoid subsequent processes, and cause counter productive or bad interference because of conventional digital TV

Main purpose of the present invention, provide a kind of digital television system with side controller after LCD TV controller and the Digital Television, comprise a LCD TV controller, be used to receive the vision signal that transmits and finished decoding by an anolog TV signals source, and according to the display format of LCD TV, to control such as this decoding video signal, metrization, image quality and color and handle; Side controller after one Digital Television, be used to receive the vision signal that transmits and finished demodulation by a digital television signal source, and to after this decoding video signal processing, export the vision signal that is produced to this LCD TV controller, by the display format of this LCD TV controller according to LCD TV, to this decoding video signal, metrization, control such as image quality and color and processing, and pass the vision signal that is produced back after this Digital Television side controller, by side controller after this Digital Television this vision signal being carried out " display display and operation " (OSD) handles, export a liquid crystal panel again to, demonstrate corresponding video image by this liquid crystal panel.So, owing to side controller after the Digital Television that has OSD control chip or circuit in being somebody's turn to do is to be designed in the final stage that whole video shows processing links, so can effectively bring into play the effect that its " display display and operation " is handled, avoid the bad interference of conventional digital TV because of subsequent processes, and the problem of dtmf distortion DTMF that causes.

For to purpose of the present invention, shape, constructing apparatus feature and effect thereof, do further understanding and understanding, for the embodiment conjunction with figs., be described in detail as follows now.

Description of drawings

Fig. 1 is the circuit box schematic diagram of conventional digital TV;

Fig. 2 is the circuit box schematic diagram of conventional digital TV set-top box;

Fig. 3 is the circuit box schematic diagram of Digital Television of the present invention;

Fig. 4 is the flow chart of digital video signal processing of the present invention; And

Fig. 5 is the flow chart that digital video signal of the present invention and analog video signal are handled.

The reference numeral explanation

Side controller after the Digital Television ... 5

Video Decoder ... ... ..51

Osd control circuit ... ... .52

First combiner circuit ... ... 53

First transmits the interface ... ... 54

First reception interface ... ... 55

Output interface ... ... ... .56

The LCD TV controller ... ... .6

The signal reception interface ... ... 61

The deinterleave processor ... ... .62

Second combiner circuit ... ... 63

Second reception interface ... ... 64

Second transmits the interface ... ... ..65

Display floater ... ... ... 7

Digital TV tuner ... ... 81

Digital television signal demodulator ... ..82

Analog television tuner ... ... 83

Anolog TV signals demodulator ... ..84

The analog video decoder device ... ... 85

Audio decoder ... ... .86.

Embodiment

For the purpose of convenience of the present invention is described, be to be that example describes in the following detailed description with the modal execution mode of present digital television system, for the optimization of manufacturing cost and the purpose of market segments, present common digital television system, general as shown in Figure 3, the functional part that all are required is divided into the analog front circuit (analog front end) of a receiving digital television signal, side controller after one Digital Television (Digital TV backend controller is hereinafter to be referred as side controller behind the DTV 5), one receives the analog television receiver (ATV receiver) of anolog TV signals, one LCD TV controller 6 (LCD TV controller), an and display floater 7.Generally speaking, the part of above-mentioned each differentiation can realize with one to two semiconductor integrated circuit chip (integratedcircuit chip) of individual packages, and even it is incorporated on the printed circuit board (PCB) (printedcircuit board) of a slice multi-disc again.But progress along with designed capacity and technology, following also might be above-mentioned each distinguish on the chip (die) that whole in part or an one is implemented in same chip, for example, with the major function in side controller behind the DTV 5 and the LCD TV controller 6, and other function of part is implemented in the same chip together, be called Digital Television controller (Digital TV controller), be a kind of possible integration mode.

In the embodiments of figure 3, only just relevantly with technical characterictic of the present invention partly be described in detail, other belongs to the element of digital television system but non-ly is the necessary person of explanation the present invention, then directly capable omitted or with simple graphic representation.In the present embodiment, include a digital TV tuner 81 (hereinafter to be referred as the DTV tuner) and a digital television signal demodulator 82 (hereinafter to be referred as the DTV demodulator of PM signal PM) behind the DTV between side controller 5 and analog front circuit (not shown), so that side controller 5 can receive through after the demodulation (demodulation) behind the DTV, the digital television signal data flow (transport packet stream) that is packetized, and the video/audio/system information (video/audio/systeminformation) in the digital television signal that side controller 5 main functions are to be received into behind the DTV is separated, carry out decode operation at video and audio signal respectively again, decoded digital video signal is then being sent to LCD TV controller 6 through after the Video processing, to carry out subsequent treatment.

In the present embodiment, side controller 5 includes a Video Decoder 51 (for example MPEG2 decoder), an osd control circuit 52, one first combiner circuit 53 (blending circuit), one first transmission interface 54 (as: BT1120), one first reception interface 55 (as: LVDS) and an output interface 56 (LVDS) behind the DTV, above-mentioned each part all couples to link up mutually by an internal bus, its the first transmission interface 54 and first reception interface 55 are connected with LCD TV controller 6, and output interface 56 is connected with display floater 7.Because the element of side controller 5 all is people institute well known of haveing the knack of digital television system behind above-mentioned each DTV, so its detailed operation principle and implementation are not promptly given unnecessary details at this.

In the present embodiment, between analog television receiver (ATV receiver) that receives anolog TV signals and LCD TV controller 6 (LCD TV controller), still include an analog television tuner 83 (hereinafter to be referred as the ATV tuner), an one anolog TV signals demodulator 84 (hereinafter to be referred as the ATV demodulator of PM signal PM) and an analog video decoder device 85, so that LCD TV controller 6 is received the vision signal that is transmitted and finished demodulation and decoding by an anolog TV signals source, and make the sound source signal that demodulation and decoding were transmitted and finished in the anolog TV signals source be sent to an audio decoder 86, with the subsequent treatment that plays sound, and the audio playing apparatus (a for example loud speaker) that exports an outside to is play.The enforcement of this technology is to have the knack of the people of digital television system institute well known, so its detailed operation principle and implementation are not promptly given unnecessary details at this.

In the present embodiment, LCD TV controller 6 includes a signal reception interface 61 (as: CCIR-656), one deinterleaveization/convergent-divergent/image quality and color treatment circuit (hereinafter to be referred as deinterleave processor 62), one second combiner circuit 63, one second reception interface 64 (as: BT1120) and one second transmits interface 65 (as: LVDS), signal reception interface 61 is used to make LCD TV controller 6 to be received by the anolog TV signals source to transmit and finished demodulation and decoded analog video, and second reception interface 64 is used to receive the decoding back and through the digital video signal of Video processing.Please consult respectively shown in the 3rd and 4 figure, after analog video signal or digital video signal are sent to LCD TV controller 6, what LCD TV controller 6 can utilize 62 pairs of deinterleave processors carries out the deinterleave processing, is converted to the signal format that is fit to the scanning of formula in proper order that display floater 7 shows with the signal format with original interleaved type scanning.If the desirable viewing mode of user is to switch to PIP (picture inpicture at present, PIP) time, as shown in Figure 5, LCD TV controller 6 also can suitably make up the digital video signal that sent by side controller behind the DTV 5 and by analog video signal that analog television receiver sent by the PIP processor, forming the image of PIP, and through second transmit interface 65 and first reception interface 55 to be sent to DTV after side controller 5.At last,, just understand processing via first combiner circuit 53 through the vision signal that is generated after the operation of aforementioned each functional part, again with DTV after the OSD picture signal that sent of side controller 5 synthesize.Then, again this final video signal after synthetic is sent to display floater 7, to play.

For more understanding treatment step of the present invention, see also shown in Figure 4ly, step digital video signal is treated and that show is described as follows in regular turn:

(401) digital television signal source that transmits is carried out tuning processing;

(402) digital television signal source that transmits is carried out demodulation process, make side controller 5 behind the DTV can receive through after the demodulation, be the digital television signal data flow of packetized;

(403) the digital television signal data flow is decoded as digital video signal, is sent to LCD TV controller 6 and carries out subsequent treatment;

(404), pass side controller 5 behind the DTV again back to the processing of interlocking of digital video signal;

(405) produce osd information;

(406) will synthesize processing through the digital video signal and the osd information of staggeredization processing; And

(407) be sent to display floater 7 to show.

See also shown in Figure 5ly, except that digital vision signal, if need handle together analog video signal, to carry out the demonstration of PIP, abovementioned steps (405) is preceding carrying out, and its detailed step is described as follows in regular turn:

(501) tuning processing is carried out in the anolog TV signals source of transmitting;

(502) demodulation process is carried out in the anolog TV signals source of transmitting;

(503) succeed and again it to be decoded as analog video signal, and analog video signal is sent to LCD TV controller 6 carries out subsequent treatment;

(504) to the processing of interlocking of analog video signal; And

(505) again analog video signal and digital video signal after the interlocking processing are handled, to form the image of PIP, and be sent to side controller 5 behind the DTV, so, proceed step (405)～(407) again, final video signal after can will synthesizing is sent to display floater 7, to play.

It is noted that at this, above-mentioned by the analog video signal that analog television receiver sent, generally also should be through the processing of deinterleaveization, because this is not an emphasis of the present invention, so narration no longer in detail; PIP is handled the order relative as the deinterleave processing with other again, belong to the selection in the system design, non-must be as person described in embodiments of the invention and the 3rd, 4 or 5 figure, must exceed by a digital video and an analog video person of being synthesized and PIP is also non-, a plurality of digital videos and/or analog video also can be for it.Moreover, though because of it is not that emphasis of the present invention is not illustrated in the present embodiment, but have the knack of should be appreciated that per capita of digital television system, LCD TV controller 6 is before the deinterleave processing, before second combiner circuit 63 or after second combiner circuit 63, also can include other and handle common handling process in the LCD TV controllers 6 such as (color processing) as zoom operations (scaling), color, and not only to be understood in the present embodiment that the revealer exceeds.

The people who has the knack of design of electronic circuits all should understand, side controller 5 and LCD TV controller 6 behind the foregoing DTV, and each mac function in other element, all can be according to design and the different demands of using, and select to adopt as use the special hardware circuit (dedicated hardwired circuitry) of specific integrated circuit (ASIC) etc., or adopt as the common treatment circuit logical circuits such as (general-purpose processing circuitry) of microprocessor software such as (microprocessor) cooperation or software program code running and realize.

Though be again to claim LCD TV controller 6 in the present embodiment, but those who familiarize themselves with the technology all should be appreciated that, the present invention only can be applicable to the liquid crystal panel technology, except the LCD panel, other is such as plane Display Techniques such as plasma foil panel, LCOS, and even other is used in the on-plane surface Display Technique that digital TV image is play, and of the present invention being suitable for all arranged.

As mentioned above, digital television system in an embodiment of the present invention is produce the OSD image in the side controller 5 behind DTV after, that is not about to earlier is synthetic with vision signal, but earlier digital video signal is sent to LCD TV controller 6, digital video signal or analog video signal are finished after deinterleave processing and/or the PIP processing, pass side controller 5 behind the DTV again back, processed video signal and OSD picture signal are synthesized, resulting thus final picture, promptly not can because of deinterleave processor 62 can't suitably judge vision signal/OSD picture signal synthetic result displacement whether, and cause the problem that has qualities such as image blurring or color mistake clear; Also can after synthesizing, just not carry out the processing of PIP in advance, and cause the covered or too small situation of OSD picture to take place.

Though the foregoing description is that the osd signal that is produced with digital television system this locality (local) is the example explanation, but the people who has the knack of TV tech all should understand, the system information that notion of the present invention also can be applicable to send in the lump along with digital television signal from local side (system information, SI).In system information, generally can include static image, as be positioned at the icon (subtitle) of one jiao in picture, static relatively image in time, as being with the several seconds at interval, the captions (closed caption) or the spatially static relatively image that switch along with story of a play or opera evolution, as be arranged in the some of picture, the horse race lamp (scrolling or text crawling) that moves with fixed rate.Suchlike information, one osd information as the aforementioned, because the first of its reception or generation promptly is the independent person of difference with vision signal, and the image of its representative all is to have static or static relatively characteristic, the predictability height, so be well suited for the synthetic processing method of image as described in the present invention, can avoid the deinterleave processing to be difficult for causing the not good problem of living picture quality.If desire to apply the present invention in the processing of system information, then video-stream processor should include a SI processor, it is to receive the SI information of being separated, and produce corresponding SI picture signal, again it is sent to LCD TV controller 6 by transport interface independently, with synthetic through deinterleave processed video signal.

What must emphasize at last is, though be to be example in the above embodiment of the present invention with more common system design at present, behind the DTV side controller 5 and LCD TV controller 6 be with respectively independently integrated circuit (IC) chip realize, and utilize as CCIR656, or transport interface such as DVI passes mutually and connects data, but the people who has the knack of TV tech and circuit design technique all should understand, even be able to function because of development of technology from now on side controller behind the DTV 5 and LCD TV controller 6, even other part of digital television system, be integrated in the single integrated circuit (IC) chip, the present invention still has it to be suitable for, that is, as long as static or static relatively images such as osd information or SI information is to begin to synthesize with it, all can reach the purpose of avoiding aforesaid drawbacks after video pictures carries out deinterleave processing or PIP processing.

Press, the above only is a specific embodiment of the best of the present invention, and only structural feature of the present invention is not limited thereto, and anyly is familiar with this skill person in field of the present invention, can think easily and variation or modification, all can be encompassed in the claim of following this case.

Claims

1. digital television system with side controller after LCD TV controller and the Digital Television comprises:

One LCD TV controller, receive an analog video signal of having finished decoding, an and digital video signal of reception decoding back and process Video processing, according to the display format of a liquid crystal panel, this analog video signal or this digital video signal are handled and formed a picture image vision signal;

Side controller after one Digital Television, this digital video signal of modulation is transmitted and has been finished in reception by a digital television signal source, and after this digital video signal carried out decoding processing, export this LCD TV controller to, and receive this picture image vision signal that is produced by this LCD TV controller; And

One display display and operation circuit, in build in after this Digital Television in the side controller, with side controller after this Digital Television with this picture image vision signal that is produced, export this liquid crystal panel to before, this picture image vision signal is carried out OSD handles.

2. digital television system as claimed in claim 1 also comprises:

One analog television tuner is used to receive anolog TV signals;

One anolog TV signals demodulator, be connected with this analog television tuner, these anolog TV signals that are used for this analog television tuner is transmitted carry out demodulation, and the simulated audio signal and this analog video signal demodulation that are comprised in these anolog TV signals are come out;

One audio decoder is connected with this anolog TV signals demodulator, is used to receive demodulated this simulated audio signal, carries out decoding processing; And

One Video Decoder, be connected with demodulator and this LCD TV controller of these anolog TV signals respectively, be used to receive demodulated this analog video signal, carry out decoding processing, and this analog video signal that will finish decoding is sent to this LCD TV controller.

3. digital television system as claimed in claim 1 or 2 also comprises:

One digital TV tuner is used to receive a digital television signal; And

One digital television signal demodulator, be connected with side controller after this digital TV tuner and this Digital Television respectively, this digital television signal that is used for this digital TV tuner is transmitted carries out demodulation, and this digital video signal that will finish demodulation is sent to side controller after this Digital Television.