Light Pen

A light pen is a device that uses light-sensitive sensors to put information on the screen with the help of a cathode ray tube. A light pen is used to draw text and diagrams or select the object with the user interface system in the CRT monitor. A light pen helps a user to select the displayed object on the monitor with more positional accuracy than the normal touch screen. A light pen helps to detect changes in the screen pixels when interfacing with the cathode ray tube scanner. 

What is a light pen?

A light pen is a pointing device used to draw the object or scan the object by using a CRT scanner in a single interface. The structure of the light pen consists of a digital photocell and a small tube with an optical system. The photocell pointing elements detect the objects on the screen and send the digital signals to other monitors. A light pen is a direct interaction device for computers with the cathode ray tube.

Explain the features and parts of a light pen

A light pen is used as a receptor to scan different pixels of light sensitivity on the screen with the help of the CRT tube elements. An electronic device is connected with the light pen to draw the image of the object scanned from the CPU. The accuracy of the function of the light pen depends on the calibration angle of the camera, probe calibration and control points. The body of the light pen generally consists of eight infrared LED light points and a removable spherical probe. 

Is the Light pen a wand-like looking device?

Yes, a light pen is a wand-like looking device that makes an interface between the CPU and the cathode ray tube. A light pen can scan various locations on an entire system by using the CRT electron beam and it depends on the position of the pen on the screen. A light pen is used in the form of a scanner in the CPU to detect and distribute the control system that affects the measurement of the accuracy of the scanner. 

Is a light pen a light-sensitive device?

A light pen is a light-sensitive pointing device that operates with the conjunction of a cathode ray tube in the form of a light-sensitive wand. Light pen uses sensors for scanning the entire pixels in a single time for producing diagrams or pictures of the scanned object. Since the scanner scans the entire pixel one single time then it is possible to track the expected time of scanning the entire location on-screen by CRT electron beam.

Explain the function of a light pen in conjunction with a computers cathode ray tube

A light pen consists of a battery and a LED lamp on the upper portion of the pen to draw or write objects when there is no light. A light pen’s accuracy depends on the angle of probe calibration and the time for scanning the objects on the screen. A light pen is an input device used in the form of a light-sensitive wand for functioning in conjunction with computers cathode ray tubes. 

Explain the types of a light pen

• Corded light-sensitive device: It is the older light pen used in the scanning where a cord is attached to the pen to sense pixels from the system
• Battery light pens: Battery light pens are modern devices that can be used in the absence of light to scam the entire elements in the pixel.

• Designer light pen: the designer light pen is used by photographers to draw designs using computer-aided technology.
• LED light pen: this device produces bright illumination of the object when scanning on the desired resolution from the system

Explain the advantages and disadvantages of a light pen

Advantages and disadvantages of light pen are illustrated below:

Advantages

• A light pen is easy to use for any monitor including CRT and LED
• Light pen provides an accurate design of high-resolution pixels scanning from the CPU
• Light pen ensures the efficiency of measurement by depending upon the probe calibration
• The light pen helps in the project of 3D printing to scanning all pixels in one single time

Disadvantages

• Light pen does not work with the LCD monitor to interface with the CPU and cathode-ray beam.
• Most light pen does not have the high-resolution capacity for 3d printing

Conclusion

The above study indicates that the scanning of the objects depends on the timing of the interface and it helps to scan the entire pixels in a single time. The control point of the light pen depends on the wavelength of the LED infrared light. The light pen helps to build an interface between the Cathode ray tube and the monitor.