Here's a more detailed explanation of how the horizontal IC functions:
1. Input Processing: The horizontal IC receives the video signal, including both the horizontal and vertical synchronization pulses, as input. It extracts and separates these synchronization pulses from the video signal.
2. Horizontal Synchronization: The IC detects the horizontal sync pulses and uses them to generate a stable horizontal synchronization signal. This signal ensures that the horizontal scanning of the CRT beam is synchronized with the incoming video signal, preventing horizontal tearing and distortion in the displayed image.
3. Horizontal Deflection Waveform Generation: Based on the horizontal synchronization signal, the IC generates a sawtooth-shaped horizontal deflection waveform. This waveform is used to drive the horizontal yoke coil of the CRT.
4. Horizontal Yoke Coil Control: The horizontal deflection waveform generated by the IC is amplified and applied to the horizontal yoke coil. This generates the necessary magnetic field to deflect the CRT beam horizontally across the screen.
5. Flyback Circuit: The horizontal IC also incorporates a flyback circuit. When the CRT beam reaches the end of its horizontal scan, the flyback circuit quickly retraces the beam to the left side of the screen. This process is repeated continuously to create a horizontal raster pattern on the screen.
6. Feedback Loop: The horizontal IC continuously monitors the horizontal scanning process and adjusts the deflection waveform if necessary. This feedback loop ensures that the CRT beam is accurately positioned and synchronized with the incoming video signal.
7. High Voltage Generation: Some horizontal ICs also include a high voltage generator circuit to produce the high voltage required for accelerating the CRT electron beam.
In summary, the horizontal IC is crucial in generating and controlling the horizontal deflection of the CRT beam in a television set, ensuring proper synchronization and display of the video image.