lcd-display-modules

What is the definition of bias ratio?

« Back to Product Matrix The bias ratio of an LCD, or the voltage margin, is defined as the ratio of V on (voltage on pixels that are currently addressed to the ON-state) divided by V off (voltage on pixels that are not currently addressed).
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What is the definition of a duty rate?

« Back to Product Matrix A duty rate, also known as the multiplex rate, is the fraction of the total frame time that each row of the LCD is addressed.
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What is the difference between active-matrix and passive-matrix LCD displays?

« Back to Product Matrix Passive-matrix LCD is an LCD technology that uses a grid of vertical and horizontal conductors comprised of Indium Tin Oxide (ITO) to create an image. Each pixel is controlled by an intersection of two conductors. By creating a potential voltage difference at an intersection, the LC fluid is able to respond by creating an “on” state at that intersection, also commonly referred to as a pixel. While relatively simple and inexpensive to produce, passive-matrix displays do have a few drawbacks. Because the charge of the two conductors ...
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How does LCD display technology produce color displays?

« Back to Product Matrix An LCD is nothing more than a light value that either allows light to go through the display or blocks the light from passing. To create a full-color display, each pixel is actually divided into three rectangular sub-pixels. When combined, these three sub-pixels are dimensionally similar to a typical square pixel. These sub-pixels are then aligned perfectly with an RGB color filter that is printed into the LCD cell itself. The color filter is a repeating pattern of Red-Green-Blue columns, with each color the width of ...
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What is a viewing angle?

« Back to Product Matrix This is the angle representing the preferred viewing direction where the LCD display exhibits the highest contrast. Viewing angles are usually defined in the horizontal and vertical directions, and measured in degrees perpendicular to the LCD surface. As the user physically moves to either side of the LCD screen, the images displayed will degrade. The preferred viewing direction or viewing angle is defined with respect to the hands of a clock. The most common angles are typically either 6 O’clock (viewed from below) or 12 O’clock (viewed ...
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What is the contrast ratio?

« Back to Product Matrix The contrast ratio is the ratio of the luminance between a pixel in the “light” state compared to the same pixel in the “dark” sate. Typical contrast ratios for the different technologies are: • TN 9:1 • STN 10:1 • FSTN 15:1 • CSTN 25:1 • TFT 300:1 and up
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What is the difference between anti-glare and anti-reflection?

« Back to Product Matrix Glare and reflection are terms that are often confused. Both anti-glare and anti-reflective enhancements attempt to improve or optimize readability while using different techniques to address the causes of reduced readability due to external ambient light sources. Anti-glare deals with external sources of reflection off a surface – like bright sunlight or high ambient lighting conditions – by using diffusion to disperse the reflected light from the surface. Diffusion works by reducing the coherence of the image that is reflected on the screen, making this unwanted image ...
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What is a Sunlight Readable or Outdoor Readable LCD?

« Back to Product Matrix Born of a need for outdoor applications and a lack of available transflective panels, Sunlight Readable Displays combine the right type of anti-reflective front polarizer and high-efficiency rear polarizer, allowing the cell to reuse some of the sunlight’s energy. Used in concert with a higher-brightness backlight, the overall image quality in an indoor, high ambient light environment is greatly improved. It is important to note that in order for the Sunlight Readable Display to function properly in an outdoor environment, the backlight will need to be ...
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What is the brightness requried for each application?

« Back to Product Matrix Each color display application will vary depending on the intended use of the LCD, the contrast, and the ambient light environment that the display is in. A typical standard notebook or desktop LCD display in office lighting conditions are in the 200-250 NIT range. In an LCD display intended for mixed use of both indoors and with the potential for uncontrolled or indirect sunlight, 500-900 NITs is recommended. For mainly outdoor or direct sunlight applications, 1,000 NITs or above is suggested. If the color display has transflective ...
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What is a NIT?

« Back to Product Matrix A NIT is a measurement of light in candelas per meter square (Cd/m2). The unit is based on the candela, the SI unit of luminous intensity, and represents a measure of light emitted per unit area. This is a common metric used in characterizing the brightness of a display device. This can apply to either the LCD display module as a whole assembly, or a measurement of the backlighting system alone without the LCD glass.
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