Patent ID: 7916118
Filing Date: 2011-03-29
Classification: G09G,H05K

Abstract:
1. A printed circuit board (PCB) module, comprising: a single-layer PCB comprising a first part of a signal processing circuit, a power supply circuit configured for outputting operation voltages, and a backlight control circuit configured for driving a backlight of an LCD (liquid crystal display), the first part of the signal processing circuit comprising: a double-layer PCB configured to be electrically connected to the single-layer PCB, the double-layer PCB comprising a second part of the signal processing circuit, the second part of the signal processing circuit comprising: wherein the crystal oscillating circuit is configured for generating a pulse clock signal having a state frequency and providing the pulse clock signal to the MCU and the scaler; the low voltage transformer is configured for providing voltages to the scaler; the video input interface circuit is configured for receiving video signals and a symbol signal from an external circuit and respectively providing the video signals and the symbol signal to the scaler and the EDID memory; the scaler is configured for receiving the video signals from the video input interface circuit, decoding the video signals into image data and sound signals, and providing the image data to the panel interface circuit and the sound signals to the voice-frequency circuit; the voice-frequency circuit is configured for transforming the sound signals into audible sounds using a speaker; the EDID memory is configured for storing symbol information of the LCD, receiving the symbol signal from the video input interface circuit, and providing the symbol information and the symbol signal to the MCU, and the MCU is configured for identifying the symbol signal with the symbol information; the work mode memory is configured for storing parameters which correspond to at least one work mode of the LCD, and the MCU is further configured for adjusting a work mode of the LCD according to the parameters; the keyboard interface circuit is configured for receiving an interrupt signal generated by a user of the LCD, and providing the interrupt signal to the MCU, such that at least one of the following characteristics of an LCD display of the LCD is adjusted: contrast, brightness, vertical size, and horizontal size; and the panel interface circuit is configured for providing the image signals received from the scaler and the operation voltages received from the power source circuit to the LCD panel.