The differences between LED screens and LCD screens are mainly determined by the following key factors:
1. Light-emitting principle
LED screen: LED is the abbreviation of light-emitting diode. Its screen is composed of many light-emitting diodes, which can directly emit light in three basic colors: red, green and blue. By controlling the brightness and combination of these LEDs, a color image can be formed. Each LED is an independent light source and does not require a backlight.
LCD screen: LCD is the abbreviation of liquid crystal display. It controls the transmission or blocking of light through the directional change of liquid crystal molecules to form an image. The directional change of liquid crystal molecules is achieved by applying an electric field to the liquid crystal layer. The liquid crystal layer is located between two parallel glass substrates, one of which has a transparent electrode. When an electric field is applied to the liquid crystal layer, the liquid crystal molecules will rearrange to allow light to pass through or be blocked, thereby forming an image. LCD screens require a backlight to illuminate the image.
2. Brightness and contrast
LED screen: It usually has a higher brightness, can maintain good visibility in strong light environments, and has a higher contrast, which can present deeper blacks and richer colors.
LCD screen: The brightness is relatively low, especially in direct sunlight. Visibility is poor. In addition, although LCD screens can also provide good contrast, they may not be as good as LED screens in some cases.
3. Energy consumption
LED screen: Because LED is a self-luminous source and consumes energy only when it needs to emit light, it is more energy-efficient than LCD screens. In addition, LED screens can adjust the brightness according to the needs of the displayed content, further reducing energy consumption.
LCD screen: Because a backlight is required to illuminate the image, and the backlight usually requires high energy consumption, the energy consumption of LCD screens is relatively high.
4. Lifespan
LED screen: The service life is generally longer, partly due to its self-luminous characteristics and lower heat generation.
LCD screen: Although it also has a long service life, it may be affected by the life of the backlight and the aging of the liquid crystal material.
5. Viewing angle and viewing angle
LED screen: Generally has a larger viewing angle and can provide consistent image quality over a wider range of angles.
LCD screen: The viewing angle range is relatively small, and the image may become blurred or distorted when viewed from the side or bottom of the screen.
6. Application scenarios
LED screen: Due to its high brightness, high contrast, low energy consumption and large viewing angle, it is more suitable for outdoor billboards, stadiums, stage backgrounds and large display screens.
LCD screen: It is widely used in TVs, computer monitors, smart phones, tablets and other occasions that require high resolution, color reproduction and viewing comfort.
7. Cost and price
LED screen: The initial cost is high, but with the development of technology and the increase in production, the cost gradually decreases. However, for large or high-end LED screens, the price is still relatively high.
LCD screen: The cost is relatively low, making it more cost-effective in areas such as consumer electronics.
In summary, the difference between LED screens and LCD screens is mainly determined by multiple factors such as light-emitting principle, brightness and contrast, energy consumption, life, viewing angle and viewing angle, application scenarios, and cost and price. When choosing which screen to use, it is necessary to make a comprehensive consideration based on specific needs and application scenarios.