lcd-display-modules

What is a Surface Acoustic Wave (SAW) touch screen?

A SAW touch screen uses a solid glass display as the touch sensor. Across the surface of the glass, two surface acoustic sound waves are transmitted – one for vertical detection and the other for horizontal detection. Each sound wave spreads across the screen by bouncing off reflector arrays along the edges of the display, and is detected by two receivers for each axis. The time at which the sound waves arrive at each receiver is known because the velocity of the acoustic wave through the ...
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What is an infrared touch screen?

An infrared touch screen surrounds the face of the display with a bezel of light-emitting diodes (LEDs) and diametrically opposing phototransistor detectors. A sequence of pulses is directed to each of these LEDs by the controller circuitry directs, which scan the screen with invisible infrared light beams just in front of the surface. The controller then detects the location where the light beams become obstructed by any object.
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What is a capacitive touch panel?

A capacitive touch screen is constructed out of glass with a coating of capacitive material electrodeposited over its surface. Oscillator circuits at the corners of the capacitive glass measure the capacitance of a person touching the glass surface. Each oscillator will vary in frequency according to where a person touches the surface. The touch screen controller measures the frequency changes to determine the X and Y coordinates of the touch. The drawback is that capacitive touch screen cannot be activated by any non-conductive material, including a ...
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What is a resistive touch panel?

A resistive touch panel typically uses a conductive glass backplane with a plastic conductive- coated inner surface. These conductive inner layers are separated by spacer dots evenly distributed across the active area. Finger or stylus pressure causes internal electrical contact at the point of touch, which supplies the touch screen controller with a vertical and horizontal analog voltage for digitization. The three most common formats are: Digital – Has a discrete number of touch locations determined by a series of rows and columns of conductors within the ...
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How do you select a touch screen technology?

The four most common touch screen technologies are: resistive, infrared, capacitive, and SAW (surface acoustic wave). Resistive and capacitive touch screen technologies are the most popular for industrial and small format applications. If the application requires that operators wear gloves when using the touch screen, then resistive is preferred over capacitive. Generally, capacitive technology offers better optical and touch performance, including multiple touch, but is more expensive than its resistive counterpart.
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What is Chip-On-Flex (COF)?

Chip-On-Flex is where the LCD driver is mounted directly to a flexible circuited board. These IC-Flex combinations would come from the driver manufacturer on a reel form referred to as TAB, or tape automated bonding. In the past, this was a very useful configuration of LCD driver ICs, as they take up much less space on the LCD glass ledge. However, they are much less common today due to the additional cost of the film.
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What is Chip-On-Glass (COG)?

Chip-On-Glass is the mounting of the LCD IC directly onto the ledge of the LCD glass itself. The IC is bonded with an anisotropic conductive film (ACF), which facilitates the mechanical adhesion, as well as the conduction from the IC to the glass.
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What is Chip-On-Board (COB)?

Chip-On-Board is the construction method with the LCD driver wafer mounted on the PCB with contacts facing up. The contacts are then wire bonded to the PCB pads, followed by a complete epoxy encapsulation for a hermetic seal.
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Most LCD controllers can be interfaced by an 8-bit, 4-bit, or 2-bit I2C, or 1-bit interface.

common drivers and segment drivers are the two unique types of driver ICs. common drivers produce signals to create rows or numbers of lines. Segment drivers produce signals to create the characters or columns. The controller IC receives data written in ASCII or JIS code from the MPU. This data in stored in RAM and is then converted into serial character patterns and transferred to the LCD driver IC. The most commonly used in monochrome graphic and newer TFT LCD modules, the driver/ controller IC receives data ...
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What types of interfaces are available LCD Controller?

Most LCD controllers can be interfaced by an 8-bit, 4-bit, or 2-bit I2C, or 1-bit interface.
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