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This TFT Module can be used for industry standard 19-inch racks that are often used to house professional audio and video equipment, as well as computer server equipment. Having a module size of 288.92 x 38.6 creates the opportunity to design products that may not have been possible with more traditional display formats.  This product has a 6-bit RGB interface and is available for any application requiring such unique aspect ratio.

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LCD

• Transmissive LCD
• Reflective LCD
• Transflective LCD
• Positive Image LCD
• Negative Image LCD

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The liquid crystal cell has no reflective properties. The image is created by utilizing a backlight behind the display. The liquid crystal cell acts as a light valve to either let the light though the display or block the light. This technology is used when there is little ambient light sources available.

Reflective

This liquid crystal device has a reflector located on the rear of the cell. Ambient light is passed though the cell and reflected back to the user. The application is best used in direct sunlight or a well-lit office environment. This technology has the lowest power consumption because there is no backlight.

Transflective

Utilizing a transflector, which is a reflector that will still allow some light to pass through, transflective displays can achieve both reflective and transmissive properties. This enables acceptable transmissive performance with a backlight in lowlight conditions, and allows the application to utilize a reflective lower power mode in adequate ambient light conditions, while maintaining good performance in direct sunlight. This is the most common monochrome LCD viewing mode.

Positive Image

Darker pixel on a lighter background, most common configuration for monochrome displays. In a non-powered state the display will retain the lighter background appearance.

Negative Image

Lighter pixel on a darker background, most common configuration for color displays. In a non-powered state the display will retain the darker background appearance.

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LED backlights consist of surface mount LED’s, which are positioned in a matrix along the bottom of a shallow plastic tray and encapsulated with a clear epoxy (LED array type). For an edge lit display, LED’s are placed along the side or sides of a thin plastic light guide which then transmits the light evenly through the LCD panel.

Lifetime 50,000-100,000hrs
Power 5V DC typical

EL (Electro Luminescent)

EL panels are a thin membrane device consisting of two coated electrode plates sandwiching a thin film of phosphorescent substance between two plates. When AC voltage is applied to the electrode plates, the electrons collide with the light emission core. The energy given off is light. EL panels come in a variety of color and require an inverter to create the AC voltage.

Lifetime 5,000-10,000hrs
Power 70V – 150V AC typical

CCFL (Cold Cathode Florescent Lamp)

CCFL lamps are small high voltage field emission lamps made of lead–glass with mercury providing a fluorescent light source. The CCFL lamps are used in conjunction with the plastic light guide to evenly disperse light evenly through the front surface of the LCD panel.

Lifetime 15,000-30,000hrs
Power 300V AC typical

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Resistive touch screens have a flexible top layer and a rigid bottom layer separated by insulating dots, with the inside surface of each layer coated with a transparent conductive coating. Voltage applied to the layers produces a gradient across each layer. Pressing the flexible top sheet creates electrical contact between the resistive layers, essentially closing a switch in the circuit.

Touch measurement in 4 Wire resistive touch screen is a 2-step process. The distance along the x-axis at the point of touch is measured by creating a horizontal voltage gradient on the top sheet, with the bottom acting as the return layer. Then a vertical voltage gradient is created on the bottom layer, to measure the y-axis.

The technology and electronics are simple, making 4-wire the cheapest touch screen technology. Any damage to either layer causes the touch screen to stop functioning. This lack of durability means that 4-wire resistive technology may not be ideal for applications like public access kiosks, or on displays larger than 12”.

5-Wire Resistive

In this technology, the main electronics are on the glass bottom layer. A uniform voltage is applied to the top layer. A touch causes an electrical contact between the top and bottom layers. Depending on the location of contact, the voltages at the 4 corners of the glass are different.

The 5-wire resistive touch screen is typically more expensive than the 4-wire technology. But the electronics make it possible to use 5-wire for applications up to 22”. In addition, the voltage measurements take place on the rear panel only, making the touch panel system more reliable and less susceptible to damage.

Capacitive

The capacitive touch screen measures the amount of capacitance in each of the touch screen electrodes. By sensing when the capacitance increases, the touch screen can tell when your finger is touching, and through measuring which electrodes have the most capacitance, the touch screen can locate to an accuracy of better than 1/1000th of an inch.

Digital Matrix

For digital matrix touch screens, the conductive material is patterned into rows and columns in the form of a grid. Each etched layer has a voltage connection. When the layers are pressed together, current will flow through the corresponding row and column where the touch occurs to calculate the position of the touch. The resolution, which is dependent on the number of rows and columns, is far lower than the analog touch screen versions. But the controller electronics are far simpler.

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