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Views: 271 Author: Site Editor Publish Time: 2023-10-24 Origin: Site
Liquid crystal displays (LCDs) are widely used in electronic devices in various industries. They are usually divided into three display types based on their light transmission mode. The three main types of LCD modes are transparent, reflective, and semi transparent. The main difference lies in how they use light to illuminate the pixels in the display.
Transparent displays rely on backlight for display. For this type of display, the light emitted from the back of the display glass must pass through the LCD and shine forward to illuminate the pixels. Transmitting LCDs are suitable for low light environments as they rely on backlight for visibility. These monitors are also used for high-resolution images, videos, and high-quality applications, which is why you usually find TFT displays with transparent display modes.
The working principle of a transmissive display is to transmit light through the surface of the display. This is achieved by using a series of layers, including a liquid crystal layer that can be manipulated to control the amount of light passing through, providing backlight for the light source, and protecting the outer layer of glass or plastic. When current is applied to pixels in the display, it allows more or less light to pass through, resulting in an image.
The most common devices using transparent LCDs are smartphones, tablets, computer monitors, and televisions. They are also used for digital cameras, portable cameras, car displays, navigation systems, onboard entertainment systems, medical devices, information kiosks, and point of sale (POS) terminals.
You can also find transmissive display mode in graphic LCD, as well as character LCD with negative display type, creating bright light colored pixels on a blue or dark background.
1. High image quality: Transmitting LCD can produce high-quality, bright, and vivid images with wide color gamut and high contrast.
2. Good visibility in low light environments: Transmitting LCDs rely on backlight for display, making them suitable for darker lighting conditions.
3. Wide viewing angle: Transmitting LCD has a wide viewing angle, making it easy to view the display from various positions.
4. Suitable for high resolution: Transmitting LCD can handle high-resolution images and videos.
1. High power consumption: Transparent LCD requires backlight to be visible, which increases power consumption and shortens the battery life of the final product.
2. Reduced visibility in bright sunlight: Transparent LCDs are not suitable for use in direct sunlight, as backlight can wash away the display.
3. Susceptible to glare: Transmitting LCD may be affected by glare, making it difficult to view the display under certain lighting conditions.
Reflective displays rely on bright ambient light for visibility. This type of display does not have a backlight inside; On the contrary, light reflects from the surrounding environment, making pixels visible.
The working principle of reflective LCD is to use a reflective layer and polarization filter to reflect light back to the user's eyes, rather than emitting light from the backlight. The liquid crystal layer modulates the amount of light reflected back to produce the desired image.
Reflective LCD is very suitable for outdoor or readable applications where devices are exposed to direct sunlight. These displays are also used for small handheld devices that focus on power consumption.You can also find reflection display modes in graphic COG LCDs and character LCDs with forward display types. The most common devices using reflective LCD are outdoor applications such as GPS devices and portable devices such as electronic readers, camera viewfinder, and digital watches.
1. Low power consumption: Reflective LCD does not require backlighting, thereby reducing power consumption and extending the battery life of the device.
2. High visibility in sunlight: The reflective characteristics of the display screen make it easy to read in bright sunlight.
3. Lightweight: Reflective LCDs are thinner and lighter than transparent LCDs because they do not have backlight, making them very suitable for portable devices.
1. Limited viewing angle: Reflective LCD has limited viewing angle, making it difficult to read the display from certain angles.
2. Poor performance in low light conditions: Reflective LCDs are not very suitable for low light environments as they rely on bright ambient light for visibility.
3. Reduce color depth: Compared to transparent LCDs, reflective LCDs typically have lower color depth, which may affect overall image quality.
A semi reflective display combines backlight and ambient light reflection to illuminate pixels, giving the display both transmission and reflection characteristics.
In semi transparent reflective LCD, backlight is used to illuminate the screen under low lighting conditions, such as indoors or at night. Under bright lighting conditions, such as outdoor or direct sunlight, the screen can be viewed by reflecting ambient light onto the LCD surface.
Semitransparent reflective LCD is commonly used in industrial and medical equipment, and high visibility is crucial under any lighting conditions. They are also widely used in marine, military, and aviation applications, where operators need to see displays in bright and low light conditions.
1. High visibility and contrast: The semi transparent reflective LCD combines the advantages of both reflective and transmissive displays, providing good visibility in bright sunlight and low light environments.
2. Low power consumption: The semi transparent reflective LCD does not require the backlight to be always on, thereby reducing power consumption and extending battery life when the backlight is turned off.
3. Wide viewing angle: Semi transparent reflective LCD has a wider viewing angle than reflective LCD.
1. Limited color depth: Compared to transparent LCDs, semi transparent reflective LCDs typically have lower color depth, which may affect overall image quality.
In summary, transparent LCDs are used for low light, reflective LCDs are used for strong light, and semi transparent reflective LCDs work well in both environments. Transparent displays will continue to be used in applications that require high-quality images and videos, such as televisions, computer monitors, and smartphones. Reflective displays will continue to be used in applications that focus on power consumption, such as electronic readers, small handheld devices, and outdoor applications. Semitransparent reflective displays are expected to be used in more portable devices and applications where visibility under constantly changing lighting conditions is crucial, such as in medical equipment, industrial, shipbuilding, and aviation applications.
The future of transparent, reflective, and semi transparent LCD displays may be influenced by technological advancements and changes in consumer preferences. LCD may eventually be replaced by new technologies such as OLED, Micro LED, and QD-LCD. At present, LCD is still a widely used display technology, and its display types and modes are suitable for various industries and environments.
