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The difference between analog and digital display screen

Source: Shenzhen new Wilson photoelectric co., LTDPopularity: 420Time: 2016-04-14SML

Simulation screen digital screen with distinction
Should be either analog or digital screen display, internal screen display of the last real drivers are a voltage value, it can be considered as an analog signal.

A statement:
Because of the increase in pixels on the screen are certainly a digital signal, the main difference is on the circuit, that A / D conversion is carried out in which part of the digital screen A / D conversion is not on the screen to complete the circuit, and direct input digital signal, analog screen the contrary, it is an analog input signal, and through a edge of the display board a / D converter into a digital signal, and output to the drive IC, it is clear that digital screen than analog screen at least one a / D conversion, and signal interference suffered too small, the picture reducing ability is stronger, it is widely used in digital products, but also MP4 choice.
Analog and digital screen on the display screen itself is no difference, the main difference is on the circuit. Are certainly digital signal is applied to the pixels on the LCD screen. There are many in the ranks of the edge of the screen drive IC, the so-called drive. In the screen behind the main circuit board is the controller, the controller will receive the signal is converted to comply with the timing requirements drive the drive signal, the drive to give, light the corresponding pixels.
Analog and digital display screen in this part of writing is the same, the main difference between them lies in the input. Direct digital screen input digital signal, RGB each color signal are converted to a video signal processing circuit several digits, drive directly into the control on the screen, A / D conversion is done in front of the circuit. The analog input is tricolor screen analog signal input, its A / D converter is a circuit on the LCD screen of completion.

Argument 2:
This problem has been said many times. The key difference in the RGB signal is input or digital simulation. You pointed out a mistake, the real input to the screen is a specific voltage value, the size of the voltage determines the size of the liquid crystal deflection, which determines how much light through can be considered driving simulation screen is needed signal, but definitely not a digital signal (RGB signals, the timing signal is digital, of course) is if the input RGB signal simulation, this screen is called emulation screen, LCM in DRIVER IC inside to sample processing, and then the sample values on to the TFT. RGB signal input is digital if called digital screen in the DRIVER IC internal LXM to the D / A conversion, which is part of the work done by the GAMMA correction circuit.
I would like to add something. As shown, this is an equivalent circuit diagram of a liquid crystal panel. When the red line to open the gate (such as the first three lines opened), source driver data (voltage) on down along the green line, stored in the Cst (storage capacitance of the liquid crystal) inside, so the point of this line was lit up, the degree of light and dark, the third line of each point depends on the size of the storage capacitor voltage. So that this voltage is an analog, digital signal voltage itself is not the size of the points. Regardless of the board to drive an analog or digital signals to be done inside the source driver ic transformation. If it is an analog signal, source driver should correspond to the voltage sampling point down, and then sent to the source (the green line). If the input is a digital signal, source driver put the digital signal into a voltage value corresponding to the point, and then sent to the source (the green line). Digital signals are not sent directly to the source line.
Above, I do not know if you have no help, if you do not understand Anything else continue thread, we can discuss it.
(LCD true color display using TFT type LCD, active matrix display, you need a source driver (source driver) and a gate driver (gate driver) to control the source and gate of the FET field effect transistor LCD source driver receives display data drives the LCD display column, also referred to as a data driver (data driver), progressive scan driver control gate.)

Say three:
Mimic the input signal is analog RGB signal, the signal generally every row to row and on the reverse, but also with the VCOM signal requires + 10V and above bias -10V or less vertical resolution is generally about 230; digital input signals into TTL and LVDS screen, such as several, usually red, green and blue tricolor with 6-8 each digital to represent, no external bias, vertical resolution is generally 400 or more.
In fact, digital screen and analog screen display are driven by a digital signal. It is now said digital screen and analog screen from the LCD interface to distinguish between, you can directly enter the simulation screen screen is an analog signal to a digital input signal is digital screen. Mimic more than a A / D converter digital screen ratio used to convert analog signals to digital signals. Digital screen directly processing the digital signal for display. Digital screen from its signal transmission points, can be divided into TTL, LVDS, etc. way.
Analog and digital screen screen screen itself is no different, the lighting when driving ranks are driving the digital signal IC used. Mimic is Pingbian.
In the field of the touch screen in the statement, also known as analogical analog screen, digital screen, also known as matrix, analogical having contacts and handwriting; only contact function matrix, similar to a resistive switch. Mimic input signal subject to A / D conversion, input calculated coordinate position is determined by the software and then coordinate position or functional role, lead mostly four (four-wire) or five (5 wired); only as a digital screen surface touch points, lead by different design lines, ranging from more than 7-8.

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