Which of the following is not a component of Memory tube display ?
Liquid Crystal
Understanding Memory Tube Displays and Their Components
A Memory tube display, also known as a storage tube display, is a type of display technology that was used before the widespread adoption of refresh CRTs and vector graphics displays. Its main characteristic is the ability to retain an image on the screen for a period of time without requiring continuous redrawing, unlike traditional CRT displays which needed to refresh the image many times per second.
This "memory" capability is achieved through the use of special electron guns and storage surfaces within the cathode-ray tube (CRT).
Key Components of a Memory Tube Display
A typical Memory tube display utilizes several components working together to create and maintain the displayed image. Let's look at the options provided and see which ones are commonly found in such displays:
- Flooding Gun: This is a crucial component of a Memory tube display. The flooding gun continuously bombards the entire display surface with low-velocity electrons. These electrons are only able to pass through and illuminate the phosphor screen in areas where a charge pattern has been "written" onto a storage mesh by a separate writing gun. The flooding gun provides the light output for the stored image.
- Collector: The collector electrode plays a role in controlling the potential of the storage mesh or other internal elements. It helps manage the electron flow and potential distribution necessary for the writing and storing process, as well as controlling how the flooding gun electrons interact with the storage surface.
- Ground: The concept of 'Ground' refers to a reference point for electrical potential. In any electronic device, including a Memory tube display, various components operate at different voltages relative to ground. Ground is an essential part of the electrical circuitry required for the operation of the electron guns, deflection systems, and other internal components. While not a physical tube element like a gun or collector, it is a fundamental electrical requirement for the display's function.
- Liquid Crystal: This refers to a state of matter that has properties between those of conventional liquids and solid crystals. Liquid crystal technology is the basis for Liquid Crystal Displays (LCDs). LCDs work by using the ability of liquid crystals to affect the polarization of light when an electric field is applied, typically used in conjunction with polarizers and backlights. This technology is fundamentally different from the electron beam and phosphor screen technology used in Memory tube displays (CRTs).
Identifying the Non-Component
Based on the function and components of a Memory tube display described above, the Flooding gun, Collector, and Ground are all integral parts of its operation or electrical setup. Liquid Crystal, however, is associated with a completely different display technology (LCDs) and is not used in Memory tube displays.
| Feature | Memory Tube Display | Liquid Crystal Display (LCD) |
|---|---|---|
| Technology Basis | Cathode-Ray Tube (CRT) with storage capabilities (electron beams, phosphor, charge storage) | Liquid Crystals interacting with polarized light |
| Key Components | Writing Gun, Flooding Gun, Storage Mesh, Collector, Deflection system, Phosphor screen | Liquid Crystal layer, Polarizers, Electrodes, Backlight (usually LED or CCFL) |
| Image Retention | Stores image using charge pattern on a mesh, reducing refresh need | Requires constant refresh (turning pixels on/off) |
| Component in Question | Flooding gun, Collector, Ground are components | Liquid Crystal is the core element |
Therefore, Liquid Crystal is the component among the options that is NOT a part of a Memory tube display.
Revision Table: Memory Tube Display Elements
| Component | Role in Memory Tube Display |
|---|---|
| Flooding Gun | Bathes the screen with electrons to illuminate stored image areas. |
| Writing Gun | Creates the charge pattern on the storage surface (not listed in options but key component). |
| Storage Mesh | Surface inside the tube that stores the charge pattern (not listed in options but key component). |
| Collector | Electrode that helps control internal potentials, assisting storage and display. |
| Ground | Essential electrical reference point for circuitry operation. |
| Liquid Crystal | NOT a component; used in LCD technology. |
Additional Information on Display Technologies
Early computer displays and oscilloscopes often used CRT technology. Vector displays, which drew lines directly, sometimes used storage tubes (Memory tube displays) to avoid flicker when displaying complex images, as they didn't need to redraw the image constantly. Later, refresh CRTs with faster phosphors and higher refresh rates became standard, and then technologies like LCD, LED, and OLED took over. Liquid Crystal technology revolutionized flat-panel displays, making monitors and TVs much thinner and more energy-efficient than CRTs.
Understanding the different technologies helps in recognizing the specific components associated with each type of display device.
Important Questions from Output Primitives
Consider the following statements with respect to approaches to fill area on raster system:
P: To determine the overlap intervals for scan lines that cross the area.
Q: To start from a given interior position and paint outward from this point until we encounter the specific boundary conditions.
Select the correct answer from the options given below:A/An _____ creates an image directly on paper by spraying ink.
Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R
Assertion A: The control points have only local control over the shape of the B-Splines.
Reason R: Bezier curves do have local control.
In the light of the above statements, choose the most appropriate answer from the options given below
