LCD and LED are two important concepts in liquid crystal display technology, but there are obvious differences between them. First of all, LCD refers to a liquid crystal display, which is composed of liquid crystals and is used to display images. LED refers to light-emitting diode, which is a light source device used for lighting. LCD screens require a backlight to display images properly, and this backlight was fluorescent CCFL in the early days, but with the development of technology, LEDs are now used more often as backlights.
In practical applications, especially in the field of LCD TVs, LED and LCD are often confused. In fact, the so-called LED TV means that its backlight uses LED technology, rather than the entire screen being composed of LEDs. Therefore, when we talk about LCD TVs, it is more accurate to say that they use LCD technology and use LEDs as backlights. In addition, for computer monitors and mobile phone screens, in most cases what we call LCD screens actually use LED backlights.
There are many differences between LCD and LED displays in practical applications. Here are some of the main differences:
Because the pixels on the LCD panel are composed of three primary colors, it can display very vivid colors. However, because the arrangement of liquid crystal molecules is affected by the electric field, the color saturation and contrast of the LCD screen are relatively low. In contrast, the light-emitting diodes of LED displays can directly adjust their brightness and color, so they have higher color saturation and contrast.
The LCD screen has a relatively small viewing angle, and the image may suffer from color distortion or reduced brightness, especially when viewed from the side. This is because the arrangement of liquid crystal molecules is affected by the electric field, causing the propagation direction of light to change. The LED display screen has a larger viewing angle because each pixel can be controlled independently.
Because LCD screens require backlights to provide light, their energy consumption is relatively high. The LED display itself is the light source and does not require additional energy supply, so it has a higher energy efficiency ratio.
LCD screens typically have a long service life, reaching tens of thousands of hours. However, over time, the arrangement of liquid crystal molecules can change, causing image quality to deteriorate. In comparison, LED displays may have a shorter service life, but under normal use conditions, their lifespan can often reach tens of thousands of hours.
Because the manufacturing process of LCD screens is relatively simple, their prices are usually lower. The manufacturing process of LED display screens is more complex and has higher costs, so the price is relatively high.
In short, LCD and LED displays each have their own advantages and disadvantages. LCD screens have advantages in color performance and service life, but they consume higher energy and have smaller viewing angles. LED displays have advantages in color saturation, contrast, energy consumption and lifespan, but their prices are higher. When choosing a display device, users should decide which type of display to buy based on their needs and budget.