LED and LCD are two different display technologies. They are significantly different in terms of working principles, structures, energy efficiency, and color performance. The following is a detailed comparison of them:
1. Basic definition
LED (Light Emitting Diode, Lighting Drimi):
LED is a semiconductor device that can directly convert electrical energy into light energy. It is a light source that can emit different colors of light, including red, green, blue, etc.
LEDs can be used for display screens, such as LED display. Each pixel consists of red, green, and blue LEDs to display the image by controlling the brightness of these LEDs. Which screen is better for your eyes: LED or LCD?
LCD (liquid crystal display, LCD display):
LCD is a display device that uses the optical properties of LCD materials to display images. The LCD itself does not glow, and the backlight needs to illuminate the screen.
The LCD screen is usually covered with LCD materials between two glass plates. The voltage controls the arrangement of LCD molecules, thereby adjusting the amount of light to form images.
2. Lighting principle
LED:
LED is self -emitted. Each pixel consists of red, green, and blue LEDs. It produces different colors and images by controlling the brightness of these LEDs.
The luminous principle of LED is electrode light. When the current passes through the LED, the electrons and acupoints are compounded to release energy and generate light. How does the LED chip shine?
LCD:
LCD itself does not glow, and backlight needs to provide light sources. Traditional LCD backlights usually use cold cathode fluorescence (CCFL), while modern LCD screens mostly use LED backlight.
The working principle of the LCD is to control the amount of light through the arrangement of LCD molecules. The LCD itself does not glow, but to adjust the light by polarizing filter and color filter to form images.
3. Backlight technology
LED is the backlight of LCD:
In modern LCD screens, LEDs are often used as a backlight source, called LED backlight LCD or LED LCD.
There are several different types of LED backlight LCD, including side -in -end LED backlights and straight LED backlights. The side -in -type LED backlight refers to the LED lamp bar installed on the side of the screen, and the light is evenly distributed through the light guide board; the straight down LED backlight refers to the LED lamp beads installed on the back of the screen and directly illuminate the screen. Introduce the value and price of the LED backlight window display.
LCD without LED backlight:
Although most modern LCDs use LED backlights, early LCD may use CCFL backlight or other types of backlight.
4. Energy efficiency
LED:
LED is self -luminous. Each pixel is controlled independently. Therefore, when displaying black, the corresponding LED can be completely closed and the energy consumption is low.
LED’s energy efficiency is high, especially when displaying high brightness images, the energy efficiency advantage is obvious.
LCD:
LCD requires the backlight to continue to shine. Even if the black is displayed, the backlight is still bright, but the LCD layer blocks the light, so the energy consumption is relatively high.
The LCD using LED backlight is more energy -saving than the LCD using CCFL backlight, but the overall energy efficiency is still lower than the pure LED display.
5. Response time
LED:
The response time of LED is very fast, which can reach the microsecond level, suitable for displaying fast -moving images, such as games and videos.
LCD:
The response time of LCD is relatively slow, especially the traditional LCD, which may occur. However, the modern LCD response time has been greatly improved, especially in the absence of rapid LCD technology.
6. Color performance
LED:
The color of the LED is high, which can produce more bright colors, especially in the performance of red and green.
The color gamut of LED can display more colors.
LCD:
The color performance of LCD depends on the type of backlight and the characteristics of LCD materials. The LCD colors using LED backlight are better, but it may not be as good as a pure LED display.
The contrast and black depth of LCD may not be as good as the LED display, especially when displaying black, due to the existence of backlight, there may be light leakage.
7. Perspective angle
LED:
The perspective of the LED display is usually wide, and clear images can be seen in a wide angle range.
LCD:
The perspective of LCD is limited to the arrangement of LCD molecules, and color distortion or brightness may occur at some angles. However, modern IPS (In-Plane Switching) technology has significantly improved this problem and provided a wider perspective.
8. Life
LED:
LED has a long life and can usually reach more than 50,000 hours. The specific life depends on the quality and use conditions of LED.
LCD:
LCD has a long life, but life span is affected by the backlight source. The LCD life with LED backlight is long, and the LCD life using CCFL backlight is relatively short.
9. Cost
LED:
Pure LED display costs high, especially in large -scale applications. Is the LED billboard expensive? How high is running?
LCD:
The cost of LCD is relatively low, especially the LCD with LED backlight has become the mainstream display technology.
10. Application field
LED:
LED display is often used for large outdoor screens, billboards, stage backgrounds, etc., because of its high brightness and wide -view angle advantages.
LED can also be used for small size display, such as LED watches, LED indicator lights, etc.
LCD:
LCD is widely used in television, computer displays, mobile phone screens, tablets and other equipment, because of its thinness, low power consumption, and good color performance.
11. Environmental protection
LED:
LED does not contain harmful substances such as mercury, and has good environmental protection.
LCD:
Traditional LCD contains harmful substances such as mercury, especially in CCFL backlight. However, LCD’s environmental protection performance with LED backlight is better because LED backlight does not contain mercury.
12. Adjustable
LED:
The brightness and color of LED can be accurately adjusted, suitable for applications that require high brightness and high color accuracy.
LCD:
LCD’s brightness adjustment range is large, but it may not be as precise as LED. Color adjustment is also affected by LCD materials and backlight.
13. Thickness and weight
LED:
The LED display can be designed very thin, but the traditional LED display may be thicker, especially outdoor large screens.
LCD:
LCD is usually very thin, suitable for portable devices and large TVs.
14. Temperature adaptability
LED:
LED has a strong temperature and can work within a wider temperature range.
LCD:
LCD may have problems such as slow reaction and color distortion in low temperature environments, especially in low temperature environments, the liquidity of LCD molecules is reduced, which affects the display effect.
15. Future development trend
LED:
LED technology is constantly developing, new technologies such as MINI LED and Micro LED are constantly emerging, and they may have greater breakthroughs in high resolution, high brightness, and high contrast in the future. Take you to understand the 9 differences between MINI LED and Micro LED.
LCD:
LCD technology is also constantly improving. For example, the emergence of OLED (organic light -emitting diode) technology provides the advantages of self -lapse, high contrast, wide -view angle, etc., but OLED is not LCD, but another display technology.
Summarize
LED:
From glowing, high energy efficiency, wide viewing angle, long life, high brightness, suitable for large outdoor screens and occasions that require high brightness.
LCD:
Backlight, energy saving (especially LED backlight), good color performance, wide perspective (especially IPS technology), low cost, suitable for indoor, portable equipment and large TV.
When choosing, you need to decide which technology to use according to the specific application scenarios and needs. For example, outdoor billboards may be more suitable for LED display, while indoor TVs are more suitable for LCD (especially LCD with LED backlight).
Thank you for watching. I hope we can solve your problems. Sostron is a professional LED display manufacturer. We provide all kinds of displays, display leasing and display solutions around the world. If you want to know: How to choose LED transparent screen manufacturers? Please click read.
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