Panasonic TH-65PX600U Service Manual page 67

50PX60 Video Process (2)
The digital TV and HDMI data are input directly to this integrated circuit. By avoiding digital
to analog and analog to digital conversion of those signals, the picture information remains
in its original structure. As a result picture quality is pure, and free from noise.
The data output of IC4019 enters the RGB Processor, IC4037. The Digital Picture Interface
selects the desired video signal from all the sources and output to the I/P, MIX, PIXEL
CONV, and RGB PROCESS circuit. Within this portion of the IC, the 480i video signal
undergoes interlace to progressive conversion. IC4037 contains a line doubling circuit that
halves the horizontal line period of the 480i input, doubling the horizontal frequency to
31.468KHz. The signals that are of the 480P, 720P and 1080i formats simply pass through
the IP converter. On Screen Display data of the MPU; such as audio and picture
adjustments are mixed with the video data. This circuit performs all picture control
operations such as brightness, contrast, color, tint, etc. The output signal is then applied to
the LVDS (Low Voltage Differential Signaling) transmitter for conversion into serial data. The
LVDS transmitter transfers the video information from the DG board to the D board. It
distributes signals with low-jitter, while creating little noise. It reduces power consumption
and the generated noise from data transmission. Another benefit of the LVDS standard is
minimal concern for cable length.
The main MCU handles all video applications. It serves as the controller that monitors all
operations of the unit.
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