English: Timing controller is abbreviated as T-CON Chinese: Timing control circuit
Function: control the core circuit of PANEL timing action, control when the scan drive circuit starts, and convert the input video signal (such as LVDS signal) into the data signal form used by the data drive circuit (such as mini-LVDS signal or RSDS signal), It is transmitted to the data driving circuit (COF IC), and controls the data driving circuit to turn on in time. The TCON circuit is the image driving circuit of the LCD screen. Some special faults in LCD TVs that are different from CRT TVs, such as blurred screens, image flipping, and whitening of images, are caused by the TCON circuit.
Main access pins:
1. LVDS signals transmitted from the digital board (including: RGB primary color signal, horizontal synchronization signal, vertical synchronization signal, enable signal, clock signal);
2. The format pin, the control voltage symbol is: SELLVDS or LVDS OPTION, the format control voltage is high and low level;
3. The power supply of the screen is mostly 12V or 5V. Now most of the screens are 12V. In the case of full HD screens, all the power supplies are 12V. The TCON board circuit is mainly composed of several parts:
1. TCON IC (required) 2. GAMMA IC (required) 3. PM IC (required) 4. GPM IC (OPTION) 5. LEVEL SHIFT IC (for GOA screen)
The LVDS signal sent by the main board circuit is converted into the gate drive signal and the source drive signal for LCD display. Complete the conversion output from LVDS to MINI LVDS; at the same time output various control sequences required by the Source/Gate Driver.
Specifically, the LVDS signal sent by the main board is converted; various control signals (STV, CKV, STH, CKH, POL) and images are provided to the “gate drive circuit” and “source drive circuit” for further conversion. Data Signal (RSDS).
two. principle
The logic board is mainly composed of five parts: 1. Gate drive circuit (row drive circuit); 2. Source drive circuit (column drive circuit); 3. Timing control circuit (T-CON); 4. DC-DC Conversion circuit (switching power supply circuit that provides voltage for the above circuits); 5. Gamma correction circuit (gray-scale voltage generation circuit).
Most of the TV cores output LVDS signals to the screen, so the T-CON board of the screen converts the signal into Mini LVDS and other signals, Gamma voltage and the signal that controls the operation of the SourceGate IC, so that the signal of the screen can be driven normally.
Each functional module of the TCON board
