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TV: LCD/Digital

TV: LCD/Digital is a digital television system that displays digital video on an LCD (Liquid Crystal Display)

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Op-Amp stereo line-out Headphone Amplifier Speaker Amplifier Clock Real-time Clock HDMI/DVI RS-232 Transceiver USB Interface I/O Expander Remote Remote AC/DC Supply Backlight Power LCD Display Bias PCMCIA Power LDO - Analog Memory Power Processor Power System Power Video Switch Temp Sensor Gamma Correction Buffer Video Filter

Design Considerations

Digital television (DTV) receives digitally modulated information (standard-definition or high-definition format) which has been compressed for transmission. The compressed data is, in turn, decoded inside the television set or within a standard receiver with a set-top box. In contrast, traditional analog TVs make use of analog signals. In the US analog broadcasting is no longer in

use so the digital video signals radiated from TV broadcasting stations must be converted over to analog if the end user still has a traditional TV set.

DTV's rapid growth in popularity has been spurred by high-definition video quality as well as the availability of a variety of new features and services including video on demand (VoD), gaming, security, digital video recorder, interactive TV, merchandising and Web browser capabilities. LCD (Liquid Crystal Display) TVs in particular will continue their dominance in the market due to their affordability. Texas Instruments has a long history of providing expertise and superior products to the video market. TI's comprehensive solutions cover everything from the initial capture of video content to the analog circuitry needed for the final viewing experience.

Core subsystem includes:

  • DTV SoC - processes all incoming video and audio (including voice/Dolby AC3/MPEG-2) from the HDMI ports, Ethernet, CATV/satellite, etc. and displays the video on the LCD screen and outputs the audio signals to the speakers, stereo line outs, or headphones. Some SoCs also have embedded MPEG-2 decoders & composite video encoders.
  • MPEG-2 Decoder & Composite Video Encoder - decodes MPEG-2 compressed data and also encodes video to NTSC/PAL/SECAM as an output of the DTV.
  • HDMI Interface - receives HDMI signals and multiplexes the incoming signals from various locations (including the side panel).
  • LCD Interface - digital video is displayed onto the screen via the LCD controller, which controls the TFT (Thin Film Transistor) gate and source drivers. TI's LCD bias solutions provide the gate and source bias voltages which may reach as high as 18 V for the source and 32 V for the gate. Gamma buffers are used in the LCD interface to provide a reference voltage to the source driver, and are also available with programmability built-in to eliminate manufacturing variance between panels. Due to the variations in construction of each panel, the optimal Vcom voltage can differ from panel to panel or across a single panel. Original Equipment Manufactures (OEMs) must therefore adjust each of the panels coming out of the factory to eliminate flicker with programmable Vcom buffers.
  • Power Conversion - Including the AC-to-DC conversion to create the main power for the unit itself, most every functional block in the LCD DTV requires a particular power solution; core and I/O power for the main processor, DDR memory, as well as power for the tuner and video/analog signal chains. TI offers all necessary power solutions to meet stringent energy conservation mandates.

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