According to the current status of the domestic digital TV industry, in addition to content services and charging mechanisms, the development of the user market also needs a highly cost-effective high-definition TV as a transition of terminal hardware upgrades to reduce the majority of wage earners and rural market upgrades. The cost makes it easy for the public to experience digital technology and gradually transition to digital TV. The most prominent feature of this type of TV is its compatibility with current analog TV and future digital TV broadcast systems. It can eliminate large areas of flicker, and you can watch TV while surfing the Internet without irritating your eyes. The key is a high-performance video processor. Through a programmable high-quality video image conversion module, it can convert input signals of different formats into the display format of this unit, so it is easy to be compatible with the display of TVs and computers. It can also output high-definition formats 1080i and 720p.
The following is a large-size LCD TV solution design using WSC1115:
Overall system design:
The core of the solution is the De-interlace and Scalar modules integrated inside WSC1115. The system block diagram is shown in Figure 1. The resolution supports 1280x768, 1280x720, 1366 × 768, single-channel LVDS interface; the input signal has analog TV input (compatible with PAL, NTSC, SECAM), analog video input (S terminal, AV terminal, YCbCr ), SD / HDTV input YPBPR, PC signal input (compatible with VGA, SVGA, XGA, WXGA), DVI signal input, analog sound signal input. Basic functions include character OSD menu, various signal input switching, image adjustment (brightness, contrast, color saturation, hue, sharpness adjustment, color temperature adjustment), TV control (automatic search, manual search, fine adjustment, standard automatic , Manual setting, channel editing, sound control), picture-in-picture, intelligent noise reduction, volume control, sound effect control, mute, factory mode (signal detection at all levels, internal register settings, white balance adjustment), etc.
Figure 1 The hardware is divided into an interface board and a digital board (see Figure 2). The interface board includes analog video signal input and output interfaces; analog audio signal input and output interfaces; TV tuner.
Figure 2 The digital board includes digital image processing (interlaced to progressive, frame rate enhancement, intelligent noise reduction, gamma correction, etc.); LCD panel driver; MCU and OSD; power management of the whole machine; sound processing and audio amplification. Two groups of signals from the CVBS, TV and Y / C (luminance and color difference) component terminals respectively enter the TV-Decoder and PIP chip through the MUX channel selector. The PIP chip performs picture-in-picture processing on the input signal to form a sub-picture signal output Go to Decoder chip to synthesize, get 8-bit CCIR656 signal from Decoder output to WSC1115; or YCBCR component signal from DTV and RGB component signal of PC through A / D converter, get 24-bit digital signal to WSC1115 After the video processing and optimization of the WSC1115 chip, through the (6/8 /) 10-bit digital interface, directly drive the LCD liquid crystal display, or output (processed) RGB analog components from the built-in 3 DACs to the CRT CRT. The audio signal from the TV signal or other signal source undergoes audio processing through the Audio Processor chip, and is output to the headset through the power amplifier chip LM358, and to the speaker (full-band 8Ω × 2) through TDA1517, as shown in Figure 3. The entire system is configured and controlled by the MCU chip through the I2C bus.
Figure three
WSC1115 does not integrate TV-Decoder inside the chip, which can give customers more choice flexibility. In this example, the VPC3230 from MICRONAS can be used, with a built-in 4H digital comb filter, which can input CVBS, S-Video, and YCBCR signals to perform full-color separation to effectively eliminate noise and cross-color phenomena. The AD part adopts MST9883 eight-bit RGB digital-to-analog conversion chip, integrated brightness, contrast control, etc.
The whole system is only controlled by an 8-bit single chip microcomputer, connected with a digital OSD chip, and has a friendly OSD operation menu. All image controls can be operated using the OSD menu and support ordinary infrared remote control. All software in the system is written in C language, and a library is established to facilitate porting and system call. And provide users with API functions of all functions, open all the underlying software and IC registers, so that users can facilitate secondary development.
WSC1115 video format conversion chip:
The chip has three digital-to-analog conversion circuits, 32-bit SDRAM controller, 0.18 um chip production process, LCD digital interface, and low power consumption design
Strong versatility: 1), WSC1115 can be used in high-definition digital TV, LCD liquid crystal TV, digital and analog compatible TV, rear projection TV, projector, set-top box and other video applications. 2). WSC1115 is a key device that connects multiple input formats and output formats, functions as a bridge, and has complete input and output format support, including some high-end configurations.
Input supports digital 24-bit YUV / YCRCB / YPRPB / RGB and 8-bit CCIR656 (ITU-RBT656) signal input, supports 18 ATSC formats of HDTV and XVGA input of computer; automatically detects the input image field frequency and line frequency; supports input line Frequency up to 52KHz or higher.
The output supports a user-defined progressive output system with a line frequency up to 52KHz (high line frequency means that it can support higher resolution output, for example: the line frequency of 800 × 600 system is 38KHz, the line of 1024 × 768 system The frequency can reach 48KHz); support 1080i, 720p digital high-definition TV standard output; support PAL system (PAL 720 * 576) double mode format (1440 * 576) output, (the PAL system through 2 times pixel sampling to increase bandwidth Double scan line output, which can greatly improve the horizontal resolution); the chip has three 10-bit DACs, supports analog RGB signal output for CRT, up to more than 1 billion color combinations; up to (6/8 / ) 10-bit LCD single pixel XVGA / 75Hz standard output.
High-quality image processing:
The traditional interlaced scan image contains sawtooth and noise. It can be seen on the TV that there are obvious large area flicker, flicker between lines, and the line structure is obvious (the phenomenon of line scan lines can be seen by the eye). After WSC1115 motion adaptive interlace to progressive and dynamic noise reduction processing, the image has high definition and the picture is clean. It can be seen on the TV that the problems of flicker and obvious line structure are greatly eliminated. · Gamma inverse correction of the input signal · Color space conversion (YUV to YCRCB, RGB to YCRCB, YPRPB to YCRCB)
· Image data storage and reading process independent architecture · Frame display frequency conversion · Film mode automatic detection and restoration · Support for cutting the input image, output image output at any position · High-quality dynamic adaptive interlace to progressive conversion Module · Dynamic image noise reduction · High-performance image magnification engine · Brightness, chroma, contrast saturation control · Dynamic blue level expansion, black level expansion · Sharpening, edge enhancement · Color space conversion (YCRCB to RGB)
· Gamma correction of output signal · Support external OSD insertion display, can display 8 different colors · Debounce technology
The following is a large-size LCD TV solution design using WSC1115:
Overall system design:
The core of the solution is the De-interlace and Scalar modules integrated inside WSC1115. The system block diagram is shown in Figure 1. The resolution supports 1280x768, 1280x720, 1366 × 768, single-channel LVDS interface; the input signal has analog TV input (compatible with PAL, NTSC, SECAM), analog video input (S terminal, AV terminal, YCbCr ), SD / HDTV input YPBPR, PC signal input (compatible with VGA, SVGA, XGA, WXGA), DVI signal input, analog sound signal input. Basic functions include character OSD menu, various signal input switching, image adjustment (brightness, contrast, color saturation, hue, sharpness adjustment, color temperature adjustment), TV control (automatic search, manual search, fine adjustment, standard automatic , Manual setting, channel editing, sound control), picture-in-picture, intelligent noise reduction, volume control, sound effect control, mute, factory mode (signal detection at all levels, internal register settings, white balance adjustment), etc.
Click to see original picture
Figure 1 The hardware is divided into an interface board and a digital board (see Figure 2). The interface board includes analog video signal input and output interfaces; analog audio signal input and output interfaces; TV tuner.
Click to see original picture
Figure 2 The digital board includes digital image processing (interlaced to progressive, frame rate enhancement, intelligent noise reduction, gamma correction, etc.); LCD panel driver; MCU and OSD; power management of the whole machine; sound processing and audio amplification. Two groups of signals from the CVBS, TV and Y / C (luminance and color difference) component terminals respectively enter the TV-Decoder and PIP chip through the MUX channel selector. The PIP chip performs picture-in-picture processing on the input signal to form a sub-picture signal output Go to Decoder chip to synthesize, get 8-bit CCIR656 signal from Decoder output to WSC1115; or YCBCR component signal from DTV and RGB component signal of PC through A / D converter, get 24-bit digital signal to WSC1115 After the video processing and optimization of the WSC1115 chip, through the (6/8 /) 10-bit digital interface, directly drive the LCD liquid crystal display, or output (processed) RGB analog components from the built-in 3 DACs to the CRT CRT. The audio signal from the TV signal or other signal source undergoes audio processing through the Audio Processor chip, and is output to the headset through the power amplifier chip LM358, and to the speaker (full-band 8Ω × 2) through TDA1517, as shown in Figure 3. The entire system is configured and controlled by the MCU chip through the I2C bus.
Click to see original picture
Figure three
WSC1115 does not integrate TV-Decoder inside the chip, which can give customers more choice flexibility. In this example, the VPC3230 from MICRONAS can be used, with a built-in 4H digital comb filter, which can input CVBS, S-Video, and YCBCR signals to perform full-color separation to effectively eliminate noise and cross-color phenomena. The AD part adopts MST9883 eight-bit RGB digital-to-analog conversion chip, integrated brightness, contrast control, etc.
The whole system is only controlled by an 8-bit single chip microcomputer, connected with a digital OSD chip, and has a friendly OSD operation menu. All image controls can be operated using the OSD menu and support ordinary infrared remote control. All software in the system is written in C language, and a library is established to facilitate porting and system call. And provide users with API functions of all functions, open all the underlying software and IC registers, so that users can facilitate secondary development.
WSC1115 video format conversion chip:
The chip has three digital-to-analog conversion circuits, 32-bit SDRAM controller, 0.18 um chip production process, LCD digital interface, and low power consumption design
Strong versatility: 1), WSC1115 can be used in high-definition digital TV, LCD liquid crystal TV, digital and analog compatible TV, rear projection TV, projector, set-top box and other video applications. 2). WSC1115 is a key device that connects multiple input formats and output formats, functions as a bridge, and has complete input and output format support, including some high-end configurations.
Input supports digital 24-bit YUV / YCRCB / YPRPB / RGB and 8-bit CCIR656 (ITU-RBT656) signal input, supports 18 ATSC formats of HDTV and XVGA input of computer; automatically detects the input image field frequency and line frequency; supports input line Frequency up to 52KHz or higher.
The output supports a user-defined progressive output system with a line frequency up to 52KHz (high line frequency means that it can support higher resolution output, for example: the line frequency of 800 × 600 system is 38KHz, the line of 1024 × 768 system The frequency can reach 48KHz); support 1080i, 720p digital high-definition TV standard output; support PAL system (PAL 720 * 576) double mode format (1440 * 576) output, (the PAL system through 2 times pixel sampling to increase bandwidth Double scan line output, which can greatly improve the horizontal resolution); the chip has three 10-bit DACs, supports analog RGB signal output for CRT, up to more than 1 billion color combinations; up to (6/8 / ) 10-bit LCD single pixel XVGA / 75Hz standard output.
High-quality image processing:
The traditional interlaced scan image contains sawtooth and noise. It can be seen on the TV that there are obvious large area flicker, flicker between lines, and the line structure is obvious (the phenomenon of line scan lines can be seen by the eye). After WSC1115 motion adaptive interlace to progressive and dynamic noise reduction processing, the image has high definition and the picture is clean. It can be seen on the TV that the problems of flicker and obvious line structure are greatly eliminated. · Gamma inverse correction of the input signal · Color space conversion (YUV to YCRCB, RGB to YCRCB, YPRPB to YCRCB)
· Image data storage and reading process independent architecture · Frame display frequency conversion · Film mode automatic detection and restoration · Support for cutting the input image, output image output at any position · High-quality dynamic adaptive interlace to progressive conversion Module · Dynamic image noise reduction · High-performance image magnification engine · Brightness, chroma, contrast saturation control · Dynamic blue level expansion, black level expansion · Sharpening, edge enhancement · Color space conversion (YCRCB to RGB)
· Gamma correction of output signal · Support external OSD insertion display, can display 8 different colors · Debounce technology
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