Display system with first controller providing analog image signal from size regulator to display device when the first controller determining that the display device is an analog display device working in a mode for displaying moving pictures and related display method

A display system comprising:

• a display device;
• an image sensor comprising an image sensor unit and a digital signal processor unit integrated therein, the image sensor unit being configured for generating a current;
• and
• a microprocessor unit configured for initializing the image sensor unit;
• wherein the digital signal processor comprises a size regulator, a first controller directly connected to the display device, an encoder, a second controller, and a decoder;
• wherein the size regulator is configured for receiving the current, generating an analog image signal according to the current, and proving the analog image signal to the first controller;
• wherein the first controller is configured for receiving the analog image signal from the size regulator, and in response to the first controller determining that the display device is only an analog display device working in a mode for displaying moving pictures, directly providing the analog image signal from the size regulator to the display device, and in response to the first controller determining that the display device is not an analog display device working in a mode for displaying moving pictures, providing the analog image signal from the size regulator to the encoder;
• wherein the encoder is configured for transforming the analog image signal to a digital image signal, and providing the digital image signal to the second controller;
• wherein the second controller is configured for receiving the digital image signal from the encoder, determining if the display device is a digital display device or an analog display device working in a mode for displaying still pictures;
• wherein when the second controller determines that the display device is a digital display device, providing the digital image signal from the encoder to the display device;
• wherein when the second controller determines that the display device is an analog display device working in a mode for displaying still pictures, providing the digital image signal from the encoder to the decoder;
• wherein the decoder is configured for transforming the digital image signal to an analog image signal and providing the analog image signal to the display device.