Plasma Display

1. Plasma Display

Plasma displays consist of millions of tiny cells placed between two glass panels. Each cell contains noble gases such as neon and xenon.

• Flat panel display technology
• Self-emissive pixels
• No backlight required

2. Structure of Plasma Display

• Front glass panel
• Plasma cells (Red, Green, Blue)
• Electrodes
• Dielectric and protective layers

3. Working Principle

When voltage is applied, the gas inside each cell becomes ionized and turns into plasma. This plasma emits ultraviolet light, which excites phosphors to produce visible colors.

Electric Signal
     |
     v
Gas Ionization (Plasma)
     |
     v
UV Light
     |
     v
Phosphor Glow (RGB)
     |
     v
Visible Image

4. Color Generation in Plasma Display

Each pixel is divided into three sub-pixels: Red, Green, and Blue. Different intensities of these colors create millions of color combinations.

• RGB phosphor coating
• High color accuracy
• Deep contrast ratio

5. Advantages of Plasma Display

• Wide viewing angles
• High contrast ratio
• Excellent color reproduction
• Fast response time

6. Disadvantages of Plasma Display

• High power consumption
• Heavy and fragile panels
• Screen burn-in issue
• Shorter lifespan than LCD

7. Plasma Display vs LCD

Plasma Display                LCD Display
---------------------------  ----------------------------
Self-emissive                 Uses backlight
High power consumption        Low power consumption
Better contrast               Moderate contrast
Heavy                          Lightweight

8. Applications of Plasma Display

• Large-screen televisions
• Home theater systems
• Public display panels

Practice Questions

1. What is a plasma display?
2. Explain the working principle of plasma display.
3. How are colors produced in plasma display?
4. List advantages and disadvantages of plasma display.
5. Differentiate plasma display and LCD.

Practice Task