monochrome display is the first form of liquid crystal displays developed. Compared with color LCD displays, monochrome display does not have color filters. monochrome display is usually in TN display mode, which is between two glasses coated with ITO electrodes. It is filled with liquid crystal material, and a polarizer is attached to the glass surface to control light. The rotation of the liquid crystal is controlled by applying voltage to the ITO electrode, thereby controlling the picture. When different voltages are applied, the liquid crystal rotates at different angles, which creates different gray scales. The viewing angle of the monochrome display y is relatively small, only about 50°. TN mode monochrome display have many different modes, such as STN, FSTN, HTN and other technologies, which improve the display effect and increase the viewing angle.
Different types of monochrome displays
Super Twisted Nematic (STN), a special design that can use lower voltage to control the display. STN lcd display also have better contrast, resulting in clearer images. STN monochrome display respond faster than TN type monitors. And the viewing angle is increased to 120°
FSTN (Film Compensated Super Twisted Nematic) is an additional optical film added to improve the contrast of the display and achieve a darker background. The viewing angle of FSTN lcd display is 150°.
HTN (High Twisted Nematic LCD), which features a wide operating temperature range and a viewing angle of 60°
In addition to the TN mode monochrome display, there is also the VA mode monochrome display. The VA mode display has a high contrast, and the black screen is very pure, with a good look and feel. The viewing angle of the VA mode monochrome display is 100°
Generally speaking, monochrome display has a simple structure, low resolution, and ultra-low power consumption. They are often used in electronic watches, calculators, industrial control systems, instrumentation, and customized display requirements. If you have high requirements for viewing angles, then a monochrome OLED display is your best choice. This is because OLED is a self-illuminating display method and has an almost 180° viewing angle.
Backlight for monochrome displays
The backlight of a monochrome display is much simpler than that of a color TFT display. Since the transmittance of a monochrome display is very high, the backlight of a monochrome display does not require high brightness. Two LED lamp beads are usually used, including white and yellow. blue, green, etc. In addition to this method, there is also a monochrome display without a backlight. Since a monochrome display does not have a color filter, this means that more ambient light can enter the display. A reflective layer is attached to the back of the monochrome display. The film can remove the backlight, so that a monochrome display with ultra-low power consumption can be obtained. Its power consumption is less than 10mw, which is undoubtedly of great benefit to battery life.
We already know about monochrome display, so how do you get the monochrome display you need? The following content will help you:
Standard monochrome display
If your project only requires a small amount of monochrome display, then standard monochrome display is your best choice. We have many standard monochrome displays, such as the most commonly used monochrome display: Resolution For 122×32, 128×64, 240×64, 320×240. And it has been tested by the market. You only need to design and use it based on the standard monochrome display, and you can quickly start your project.
Custom monochrome display
If the standard monochrome display cannot meet your requirements, then a customized monochrome display is the best choice. The tooling cost is about US$400~500. If you have special requirements, the tooling cost may be higher. And it should be noted that if you customize a new monochrome display, the backlight usually also needs to be customized, and the tooling cost is about US$1,000.