Generally, you can use the word LCD to refer to a digital screen, which is commonly used in a calculator, computer monitor, or other electronic device.
LCD in a calculator
Until the mid 1970s calculators were built from bulky batteries. In the late 1970s and early 1980s, the technical development of calculators slowed. Several companies developed LCD displays for calculators. Eventually, most new calculators used LCDs.
One of the first calculators with an LCD was introduced by Sharp Corporation in 1973. The EL-805 calculator was a COS type unit, combining an LCD, CMOS-LSI circuitry, and wiring in a single glass panel. The EL-805 was a popular device. It operated for 100 hours on an AA-sized battery. It also weighed 1/12th the weight of the original. It was a bit pricey, however.
One of the most important advantages of a liquid crystal display is its ability to rotate polarized light. It works by polarising the light from a bottom polariser, and then reflecting it back at the pixel.
LCD in a computer monitor
Almost all laptop computers are equipped with an LCD display. These are often powered by a 12 V power supply. These monitors have a high resolution and are generally very bright. These monitors are light and easy to move. They are also much cheaper to make than CRTs.
One of the most important specifications for LCD computer monitors is the contrast ratio. This is the brightness of full-on pixels compared to full-off pixels. This varies depending on the display.
Another important specification is the viewing angle. Usually, a wide viewing angle will give a higher contrast ratio. However, a narrow viewing angle can produce color variations and a reduction in brightness.
Some LCDs are made using active matrix technology. This is achieved by placing a transistor at each pixel intersection. This improves screen refresh time, reduces power consumption, and requires less current to control luminance.
LCD backlight
Various electronic displays, including liquid crystal displays, require backlighting technology to make them visible. In addition, many smart devices such as mobile phones, televisions, and computers use backlights to provide additional illumination. However, choosing the correct backlight can be challenging.
There are two basic types of LCD backlighting systems: CCFL and LED. The former is a traditional technology that has been used for years, but is currently being phased out. The LED is newer, and is taking over the market. It is also more energy efficient and brighter.
CCFL (Cold Cathode Fluorescent Lamp) backlights are typically white in color and have a mercury content. These lamps are mounted on the edge of the display, and are designed to provide uniform lighting. These backlights are less energy-efficient than the LED and can be a bit bulky.
LCD polarizing filter film
Normally, a LCD display has two polarizers that are placed at a 90 degree angle to block light. This technique has been used for many years. However, special full matching technology has led to more widespread use of polarizers in LCD displays.
In a typical LCD display, there are millions of pixels. The pixels are made of liquid crystal and are activated by an electric current. The brightness of each pixel must be independently controlled. Depending on the type of light, the pixels may need to change the brightness level.
In addition to the polarizer, the display also uses a backlight to illuminate the pixels. The backlight works by using electroluminescent diodes or LEDs. If the backlight is not working, the LCD will not be able to show images.
LCD command
Using the LCD command system is easy. It involves sending arbitrary data to the LCD. It is also possible to test LCD functions. There are several LCD commands to choose from. Some commands are more useful than others. Among the most useful LCD commands are those for shifting the display, writing the cursor’s position, and turning the display on or off. These are all well-known LCD functions.
The first step in sending a command to the LCD is to select the data register. This can be done by grounding the R/W pin. You can also select the data register by using the RS pin.
The second step is to write the data to the data register. It is recommended to do the writing using a macro defined in your firmware.
