Circuit Description - ViewSonic VX2413wm-2 Service Manual

4. Circuit Description

4.1 Main Board
NT68667UFG/C（U401）
The NT68167 is a highly integrated flat panel display controller that interfaces analog, digital, and video inputs. It
combines a triple ADC, a high quality zoom and shrink engine, a multi-color on screen display (OSD) controller and
many other functions in a single chip. It provides the user with a simple, flexible and cost-effective solution for
various flat panel display products.
The NT68167 operates at frequencies up to 166MHz , suitable for LCD monitor up to 1680x1050@75 resolution
and NT68167U operates at frequencies up to 190MHz , suitable for LCD monitor up to 1920x1080@75 resolution .
The NT68167 also has a built-in noise reduction function to provide more stable video quality, spread spectrum to
provide low EMI solution, sRGB for video color space convert and post pattern for manufacture test.
The display provided single/double pixel clock LVDS interface.
In addition, NT68167 includes an integrated 8-Bit Microcontroller (MCU). It contains an 8-bit 8031 micro-controller,
1,280-bytes internal data memory, four 7-bit resolution A/D Converter, 10-channel 8- bit resolution PWM DAC, and a
UART. Except those, it has one-channel hardware DDC solution, and VESA 2Bi/2B+ master/slave I2C bus interface.
Block Diagram
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