CN2494091Y - Liquid crystal back projection television set with VGA indication function - Google Patents

Abstract

A liquid crystal rear projection television with VGA displaying function belongs to television filed. The television includes a casing and a chip. The chip includes a main channel, a picture in picture, an AV end and the circuits of signal processing of video and color, accompanying sound output of, traveling field signal processing and other circuits imported together with the VGA interface, such as signal selecting circuit and A/D transforming circuit, format transforming circuit, D/A transforming circuit, embedded level circuit and driving circuit of liquid crystal. A/D transforming is composed of AL875, and format transforming is composed of AL300. D/A transforming is composed of CXD1178Q, the driving preprocessing of liquid crystal and the three-section-r correcting circuit are composed of CXA2111R, the driving of liquid crystal is composed of CXA2112R, and the sequential circuit is composed of CXD3500R. The image is high precise and high distinct, line-based scan technology is adopted, the picture has no blinking and no effect of luminance variation, and no distortion. The power consumption is reduced 1/3, the VGA displaying function is hold. There is no effect of geomagnetism, no radiation, no sintering phenomenon. The application is broadly in family, hotel and other sites.

Description

The liquid crystal back projection TV set of band VGA Presentation Function

Technical field

The utility model relates to field of television, a kind of liquid crystal back projection TV set with the VGA Presentation Function of more clearly saying so.

Background technology

At present, projection TV set is mainly the CRT rear-projection both at home and abroad, and the CRT rear-projection is because of adopting the projection tube of three separation, and focusing is complicated, and power consumption is big, and bulking value is huge, the production technology complexity.The CRT rear-projection is when the VGA Display signal, owing to will satisfy brightness requirement, the thickness of electron beam is restricted, influenced the definition of picture and character, and CRT is subjected to influence of geomagnetic three looks to occur to assemble inaccurate easily, therefore display resolution is low, generally can only show the resolution of 640X480, can't satisfy the jumbotron display requirement of higher display resolution.The CRT rear-projection TV sintering phenomenon can occur on the projection tube screen when showing the computer fixed signal for a long time, therefore influence use and the life-span of CRT.

The purpose of this utility model is to provide a kind of above-mentioned deficiency that overcomes, and has both had television receiving function, has the lcd projection tv machine that shows the following Computer signal of 1024X768 again.Its picture is stable, and flicker free does not have high-power circuits such as complicated row, field, convergence, and Overall Power Consumption is little, and circuit is simple, and rational photo engine of matching design and light and handy cabinet can be realized complete machine image quality height, the characteristics that complete machine is light, thin.

Summary of the invention

The purpose of this utility model is to realize like this, a kind of liquid crystal back projection TV set with the VGA Presentation Function comprises television reception part and decoding, the input of computer VGA signal and switching circuit, digital signal conversion process, liquid crystal display drive circuit, single chip liquid crystal light engine etc.It is made of casing and the movement that is installed in the casing.Movement is by the main channel circuit, the picture-in-picture circuit that is connected with the distributor of main channel circuit, the AV end and video and the chroma processin circuit that are connected with picture-in-picture circuit with the main channel circuit, the sound accompaniment output circuit that is connected with the TV/AV selector switch of AV terminal circuit, the row that is connected with chroma processin circuit with video, field signal treatment circuit and the R/G/B/HD/VD signal of importing with the VGA interface thereof select and A the D change-over circuit, with A the format conversion circuit that is connected of D change-over circuit, the D A conversion that is connected with format conversion circuit, clamped and LCD panel drive circuit constitutes.Said A D change-over circuit is made of AL875 and outside phase-locked loop circuit IC1523.Format conversion circuit is made of AL300 and outside phase-locked loop MK9173.D A change-over circuit in the D A that is connected with format conversion circuit conversion, the clamped and LCD panel drive circuit is made of CXD1178Q, LCD panel drives preliminary treatment and the syllogic checking gamma circuit is made of CXA2111R, the LCD panel drive circuit is made of CXA2112R, and sequence circuit is made of CXD3500R.

The utility model is provided with 15 pin VGA computer interfaces, can connect computer.The light engine model is DS005AKA, and veneer LCD panel model is LCX021AM, utilizes advanced micro mirror technology to realize that true colour display screen shows the display resolution with 800X600.Television set and Computer signal treatment circuit adopt common A/D change-over circuit AL875, digital processing chip AL300, and D/A change-over circuit CXD1178Q, checking gamma circuit CXA2111R and liquid crystal drive are amplified the CXA2112R circuit.

Signal flow is as follows:

The radio television signal that receives by antenna, be divided into two-way in RF distributor DAE122BK, one tunnel (main channel) is after tuner TDQ-3B8 mixing, and the medium-frequency IF signal is exported from 11 pin, through preposition amplification, Surface Acoustic Wave Filter, enter 1,2 pin of TDA9808.TDA9808 is that image, sound intermediate frequency are amplified and detecting circuit.9 pin of TDA9808 are exported the composite video signal after detection, are sent to 7 pin of TA1218.

TA1218 is that three road AV switches are selected integrated circuit.Behind the vision signal gating of composite video signal and external AV input, output to 3 pin of TC9090 from 38 pin of TA1218.TC9090 is the Y/C separating treatment circuit of PAL/NTSC double-standard.Bright/chrominance signal after the processing is input to 30,32 pin of TA1218 from 23,25 pin of TC9090, after selecting with the luminance signal of S terminal input and carrier chrominance signal switch, from 34 pin and 36 pin output carrier chrominance signal and the luminance signal of TA1218, be input to 42 pin and 45 pin of TB1227.

TB1227 is digital video/colourity/deflection (VCD) process chip, finishes the function that brightness processed, chroma decoding and deflection small-signal are handled.YUV Y, R-Y behind chroma decoding, B-Y signal output to 1,2,17 pin of TDA4566 from 35,36,37 of TB1227.TDA4566 is that the colourity transient state is improved circuit (CTI).Signal is input to 4,5,6 pin of TDA9176 from 7,8,12 of TDA4566.TDA9176 is that luminance transient improves circuit (LTI).Y, R-Y, B-Y signal after LTI handles are exported from 11,12,13 pin, turn back to 31,33,34 pin of TB1227, are decoded as R, G, B primary colour signal through the matrix circuit of TB1227.

Another road enters 33,34 pin of picture-in-picture process chip TDA8310 from 11 pin after the mixing of signal through tuner ENV59D25G of distributor output.TDA8310 is the picture-in-picture digital processing and the decoding chip of intermediate frequency input.SDA9187 and SDA9189 are the picture-in-picture control chips.Through 23,24,25 pin and 22 pin that picture-in-picture is handled and decoded R, G, B and blanking signal FB signal output to TB1227 from 6,7,8 pin and 5 pin of TDA8310, after inside is mixed with R, G, the B primary colour signal of main signal and is handled, from 12,13, the 14 pin output of TB1227.

The row of TV, a small-signal are exported from 4,53 pin of TB1227, the two processing that trigger monostable multi resonant oscillator TC4528 of warp, the synchronous and field sync signal of row that output is regular.After the R/G/B that this signal is exported with video decode selects to switch by switch with the R/G/B/HD/VD signal of VGA interface input, 12,20,28,90,93 pin that are input to AL875 are handled, AL875 mainly finishes the A/D conversion, and analog signal conversion is become digital signal.The sample rate of outside phase-locked loop ICS1523 control AL875.

R, G, B three tunnel 8 position digital signals output to 11～18,20～27,29～36 pin of AL300 respectively from 71～78,61～68,49,52～58 pin of AL875 after the A/D conversion.AL300 is the signal format change-over circuit.AL300 judges the type and the form of received signal earlier, the vision signal of PAL50/NTSC60 is carried out the interlaced/progressive conversion process, become progressive-scan signal, perhaps the different resolution signal to the computer input carries out interpolation and proportional zoom processing, the signal of output 800X600 form.Auxiliary AL300 locking line frequency of outside phase-locked loop MK9173 and point-frequency signal provide the MCK frequency to use for CXA2112R simultaneously.

8 R, G after AL300 handles, the B digital signal outputs to CXD1178Q respectively from 92～100,102～110,112～120 pin of AL300 1 ~ 8,9 ~ 16,17 ~ 24 pin.CXD1178Q mainly finishes the D/A conversion, converts digital signal to analog signal.Simulation R, G after the conversion, B signal be respectively from the output of 37,39,41 pin of CXD1178Q, behind the three tunnel clamped circuit of being made up of a triode and three resistance respectively, is input to 22,24,26 pin of CXA2111R.CXA2111R is the driving preliminary treatment and the syllogic checking gamma circuit of LCD panel special use.R after the γ treatment for correcting, G, B signal are received 47 pin of different CXA2112R respectively from the output of 18,16,14 pin.CXA2112R is the drive circuit of LCD panel, and each generates 6 road SH (sampling keeps) signal, is used to drive LCD panel.The sequential of CXA2111R and CXA2112R is provided by chip CXD3500R, the different sequential that provide LCD panel to show.

Liquid crystal drive and clock signal finally are added in the LCD panel in the light engine, form image on LCD panel.Through illumination and the imaging system in the photo engine, the image that output is amplified through mirror reflects, forms the large scale display image on screen.

Outstanding advantage of the present utility model is: image has the characteristics of high meticulous and high definition, computer is supported the signal of XGA (1024*768) (compression shows) and the following form of SVGA (800X600), can show the high-resolution microcomputer signal that the CRT rear-projection can't show; TV signal adopts and handles new technology line by line, has eliminated the capable structure scan line of CRT rear-projection TV, the picture flicker free; LCD TV does not have the such row high pressure of CRT, the influence that visual amplitude is not changed by brightness, and picture is stablized undistorted; This machine is not subjected to influence of geomagnetic, does not have the convergence adjustment of CRT rear-projection TV complexity, can arbitrarily move, and need not to adjust; And not having the radiation of high-pressure electronic ray, real zero radiation meets modern environmental protection trend.The Overall Power Consumption of this machine is little, compares with unidimensional CRT rear-projection TV, and power consumption will reduce nearly 1/3.Crystal projection eliminated the CRT rear-projection TV since long-time play fixed image and on picture tube the sintering phenomenon of image, use more convenient, more relieved.

Description of drawings

Fig. 1 is the block diagram of the utility model movement.

Fig. 2 handles for row, the field signal of movement and selects (multiplexing switching) circuit diagram with the R/G/H/HD/VD signal that the VGA interface is imported.

Fig. 3 is A/D change-over circuit figure.

Fig. 4 is D/A conversion and clamped circuit diagram.

Fig. 5 is the circuit diagram of TV part central processing unit.

Fig. 6 is the way circuit figure of liquid crystal drive.

Fig. 7 is an integrated circuit model menu.

Shown in Figure 1, movement is selected and A/D change-over circuit 5, format conversion circuit 6, D/A conversion, clamped and LCD panel drive circuit 7 are constituted by main channel circuit 1, picture-in-picture circuit 4, AV end and video and chroma processin circuit 2, sound accompaniment output circuit 3, row, field signal treatment circuit and with the R/G/B/HD/VD signal that the VGA interface is imported.

Fig. 2～shown in Figure 7, the A/D change-over circuit is made of AL875 and IC1523, format conversion circuit is made of AL300 and MK9173, the D/A change-over circuit is made of CXD1178Q, LCD panel drives preliminary treatment and the syllogic checking gamma circuit is made of CXA2111R, LCD panel drive circuit CXA2112R constitutes, and sequence circuit is made of CXD3500R, and clamped circuit is made of three road triode resistance circuits.The central processing unit of TV part is made of TMP87CM38N, is used for control, coordinates the each several part circuit.

Embodiment

Embodiment is as follows:

A kind of liquid crystal back projection TV set with the VGA Presentation Function, it is made of movement and casing.Movement is selected and A/D change-over circuit 5, format conversion circuit 6, D/A conversion, clamped and LCD panel drive circuit 7 are constituted by main channel circuit 1, picture-in-picture circuit 4, AV end and video and chroma processin circuit 2, sound accompaniment output circuit 3, row, field signal treatment circuit and with the R/G/B/HD/VD signal that the VGA interface is imported.Wherein the A/D change-over circuit is made of AL875 and IC1523, format conversion circuit is made of AL300 and MK9173, the D/A change-over circuit is made of CXD1178Q, LCD panel drives preliminary treatment and the syllogic checking gamma circuit is made of CXA2111R, LCD panel drive circuit CXA2112R constitutes, sequence circuit is made of CXD3500R, and clamped circuit is made of three road triode resistance circuits.The central processing unit of TV part is made of TMP87CM38N, is used for control, coordinates the each several part circuit.Its image is high-precision thin and tall clear, adopts progressive scanning technology, and picture flicker free and be not subjected to the brightness variable effect is undistorted.Band VGA Presentation Function, power consumption reduces by 1/3.Be not subjected to the ground magnetic influence, zero width of cloth is penetrated no sintering phenomenon.Can be widely used in family, the hotels and other places.

Claims (4)

1, a kind of liquid crystal back projection TV set with the VGA Presentation Function, it is made of casing and the movement that is installed in the casing, it is characterized in that said movement is by the main channel circuit, the picture-in-picture circuit that is connected with the distributor of main channel circuit, the AV end and video and the chroma processin circuit that are connected with picture-in-picture circuit with the main channel circuit, the sound accompaniment output circuit that is connected with the TV/AV selector switch of AV terminal circuit, the row that is connected with chroma processin circuit with video, field signal treatment circuit and the R/G/B/HD/VD signal of importing with the VGA interface thereof select and A the D change-over circuit, with A the format conversion circuit that is connected of D change-over circuit, the D A conversion that is connected with format conversion circuit, clamped and LCD panel drive circuit constitutes.

2, according to the liquid crystal back projection TV set of the described band of claim 1 VGA Presentation Function, it is characterized in that said A D change-over circuit is made of AL875 and outside phase-locked loop circuit IC1523.

3, according to the liquid crystal back projection TV set of claim 1 or 2 described band VGA Presentation Functions, it is characterized in that said format conversion circuit is made of AL300 and outside phase-locked loop MK9173.

4, according to the described liquid crystal back projection TV set of being with the VGA Presentation Function of each claim among the claim 1-3, it is characterized in that the D A change-over circuit in the said D A conversion that is connected with format conversion circuit, the clamped and LCD panel drive circuit is made of CXD1178Q, LCD panel drives preliminary treatment and the syllogic checking gamma circuit is made of CXA2111R, the LCD panel drive circuit is made of CXA2112R, and sequence circuit is made of CXD3500R.

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