Printed circuit board module with single and double layer printed circuit boards

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 low voltage transformer, an EDID (extended display identification data) memory, a voice-frequency circuit, and a video input interface circuit; and

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:

a crystal oscillating circuit, a scaler, an MCU (micro controller unit), a work mode memory, a panel interface circuit, and a keyboard interface circuit;

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.

2. The PCB module as claimed in claim 1 , wherein the first part of the signal processing circuit contains components that process low frequency signals with little or no demand for an anti-interference configuration.

3. The PCB module as claimed in claim 1 , wherein the second part of the signal processing circuit contains components that process high frequency signals with substantial demand for an anti-interference configuration.

4. The PCB module as claimed in claim 1 , wherein the single-layer PCB further comprises an electrical socket, and the double-layer PCB comprises a plurality of connecting pins inserted into the socket such that the double-layer PCB is electrically connected to the single-layer PCB.

5. The PCB module as claimed in claim 1 , wherein the double-layer PCB is electrically connected to the single-layer PCB through an FPCB (flexible printed circuit board).

6. The PCB module as claimed in claim 1 , wherein the double-layer PCB is electrically connected to the single-layer PCB through an electrical connector.

7. The PCB module as claimed in claim 1 , wherein the external circuit is a computer or a digital video disc (DVD) player.

8. The PCB module as claimed in claim 1 , wherein operation of the voice-frequency circuit is controlled by the MCU.

9. A printed circuit board (PCB) module, comprising:

a single-layer PCB comprising a low voltage transformer, a video input interface circuit, and an EDID (extended display identification data) memory;

a double-layer PCB configured to be electrically connected to the single-layer PCB, the double-layer PCB comprising a crystal oscillating circuit, a scaler, an MCU (micro controller unit), a work mode memory, a panel interface circuit, and a keyboard interface circuit;

wherein 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 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 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 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 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 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; and

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.

10. The PCB module as claimed in claim 9 , wherein the single-layer PCB further comprises a power supply circuit configured for outputting operation voltages to the low voltage transformer, the panel interface circuit, the MCU, and the voice-frequency circuit, and a backlight control circuit is configured for driving a backlight of an LCD (liquid crystal display).

11. The PCB module as claimed in claim 9 , wherein the first part of the signal processing circuit further comprises a voice-frequency circuit configured for transforming the sound signals into audible sounds by a speaker.

12. The PCB module as claimed in claim 9 , wherein the single-layer PCB further comprises an electrical socket, and the double-layer PCB comprises a plurality of connecting pins inserted into the socket such that the double-layer PCB is electrically connected to the single-layer PCB.

13. The PCB module as claimed in claim 9 , wherein the double-layer PCB is electrically connected to the single-layer PCB through an FPCB (flexible printed circuit board).

14. The PCB module as claimed in claim 9 , wherein the double-layer PCB is electrically connected to the single-layer PCB through an electrical connector.