TELEVISION LINES (TVL)
TVL (Television Lines) in CRT (Cathode Ray Tube) technology refers to a measure of the horizontal resolution or the number of distinct horizontal lines that can be displayed on a CRT screen. It represents the level of detail that the CRT display can reproduce.
The TVL specification is commonly used to quantify the resolution capabilities of analog video systems, including CRT televisions and monitors. It is measured by counting the number of alternating black and white vertical lines that can be displayed on the screen.
For example, a CRT display with a TVL specification of 500 would be capable of displaying 500 distinct horizontal lines from top to bottom across the screen. The higher the TVL value, the greater the resolution and level of detail that can be achieved.
TVL is an important factor to consider when evaluating the image quality and sharpness of a CRT display. Higher TVL values typically result in clearer and more detailed images with sharper edges and finer textures. However, it's important to note that TVL is just one aspect of overall image quality, and factors such as the quality of the electron gun, phosphor coating, and signal source also contribute to the final visual output.
With the advancement of digital display technologies and the transition to high-definition resolutions, TVL specifications have become less relevant in modern displays. However, for retro gaming enthusiasts and those interested in vintage CRT technology, TVL can still be a useful metric to assess the capabilities and image quality of CRT displays.