cn01 lcd panel specs factory

Learn all about touch types, brightness, backlights, color depths, and more. We’ve created a key terms and definitions library to guide you along your lcd technology search.

LCD brightness, or more technically “Luminance”, is measured in millicandles of luminance per square meter, also known as “NITs”. Serious specifies a “minimum typical” brightness for each display, meaning that the described LCD has a typical luminance specification at least that amount. LCD brightness is measured at the LCD’s initial power-up. See backlight longevity, below, for how LCD backlights degrade over time.

LCD backlight lifetime is a function of the specific LEDs selected for the backlight, and is measured in thousands of hours. If the backlight is maintained at 100% full power from initial LCD powerup fresh from the Serious factory, the typical brightness after that many hours will be typically 50% of its initial luminance.

Color LCDs get darker when operated below the minimum temperature range, and respond more sluggishly to visual changes. At higher temperatures, LCDs get washed out. At certain temperature extremes, the LCD driver chips may not function at all. The LCD temperature range is the minimum range where the LCD is deemed to perform acceptably without factoring in any backlight warming. LCD backlights do generate (when fully powered) several degrees of heat that can help obtain better LCD functionality at the low end of the LCD specification.

Note this range does not mean the SIM will cease functioning necessarily. Most SIMs are rated at -40 to +80C, so it is possible the SIM can continue to function even if the LCD is not visible to the user.-20 to +70C: most cost effective, most common

This is the number of bits the LCD uses to represent one pixel. There is often a GUI performance penalty for going above 16 bits because 4 bytes (vs. 2) have to be used to represent a pixel on the driver MCU and typically this impacts memory and performance (or, alternatively, the power of the MCU required to deliver equivalent performance).  Unless your GUI has extensive large shading gradients, 16-bit is almost always adequate for most applications.16 bit / 65K colors: most cost effective, most widely available, suitable for most applications (RGB565)

LCD technology is rapidly evolving. There are several types of “viewing technology” now available. Some are a function of the raw LCD panel fabrication process, others a result of optically bonded film techniques.

TFT-TN Portrait: traditional portrait mode viewing. When the LCD is viewed with the long edge vertically, has good viewing from 3 sides (typically 9, 12, and 3 o’clock) and reduced angle viewing from one (typically 6 o’clock)

Optical Viewing Angle (OVA) Films:a film can be applied to the surface of a traditional TN-TFT panel and deliver typically 75%+ viewing angles in all 4 directions, similar to true  as Multi-domain-Vertical Alignment (MVA) panel. Often OVA and MVA panels are categorized together asMulti Viewing Angle (MVA) panels

Multi Viewing Angle (MVA): Multi-domain Vertical Alignment (MVA), often called “Multi Viewing Angle” is a new technology combining optics with LCD manufacturing techniques providing good viewing angles from all 4 directions without contrast or color shifting. MVA carries a price premium and is becoming less common as OVA is less expensive with similar results, and IPS delivers better performance and more common.

In Plane Switching (IPS): an LCD fabrication technology which gives excellent viewing angles from all directions without contrast/color shift. It carries a higher price premium and is more common in larger panels (10.1″+) in the industrial/embedded space.

BEZEL OPENING: inner limit where your bezel should be contacting the surface of the touch panel & LCD with any gasket and not adversely affect touch performance

ACTIVE AREA (A.A.): active pixel area of the LCD, and of the touch region; you will want to ensure visually the center (C) of this active area is visible to the end user, and accessible for touch interface

Note that the specification of Response Time is at 25C; response times will often be progressively slower as the operating temperature drops below -10C for most panels.

There are two types of interpretations of Trand Tf, depending on the nature of the panel technology: Normally Black (Negative) or Normally White (Positive).

Color can be technically and empirically measured, but how it is perceived by the human eye is the true goal of color appearance in an LCD. A color “gamut” is a specific range of color out of the full color palette most relevant to how the human eye perceives color.

This diagram shows the “standard” color spaces we want to reference when we talk about what color appearance can be generated by a specific LCD:The colored areain the graph is the total range of color visibleto the human eye. Not all these colors can be generated by an LCD. D65 is the white point

When colors are displayed on a specific LCD, they deliver colors in an area similar to the dashed triangle on the diagram above — in other words, a subset of the NTSC space, and often close to the sRGB space used to take and edit photographs digitally. In web and GUI development tools, colors are generally represented by a triplet of 3 hex values from 0x00-0xFF (i.e. 0-255 decimal, or 0-100%) in triplets such as 0x223344 where 0x22 is hex 22 for the red value, 0x33 for green, and 0x44 for blue. Each individual color (red, green. blue) when driven at 100% (0xFF) represents a corner of the dashed “LCD performance” triangle.

Because the NTSC gamut is the most relevant color space to the human eye, the standard mechanism for determining an LCD’s color performance is to compare the LCD’s performance (the dashed triangle) against this NTSC gamut:NTSC(gamut)% = area of dashed triangle / area of NTSC triangle * 100%

LCD display doesn’t operate the same way as CRT displays , which fires electrons at a glass screen, a LCD display has individual pixels arranged in a rectangular grid. Each pixel has RGB(Red, Green, Blue) sub-pixel that can be turned on or off. When all of a pixel’s sub-pixels are turned off, it appears black. When all the sub-pixels are turned on 100%, it appears white. By adjusting the individual levels of red, green, and blue light, millions of color combinations are possible

The pixels of the LCD screen were made by circuitry and electrodes of the backplane. Each sub-pixel contains a TFT (Thin Film Transistor) element.  These structures are formed by depositing various materials (metals and silicon) on to the glass substrate that will become one part of the complete display “stack,” and then making them through photolithography. For more information about TFT LCDs, please refer to “

The etched pixels by photolith process are the Native Resolution. Actually, all the flat panel displays, LCD, OLED, Plasma etc.) have native resolution which are different from CRT monitors

Although we can define a LCD display with resolution, a Full HD resolution on screen size of a 15” monitor or a 27” monitor will show different. The screen “fineness” is very important for some application, like medical, or even our cell phone. If the display “fineness” is not enough, the display will look “pixelized” which is unable to show details.

But you see other lower resolution available, that is because video cards are doing the trick. A video card can display a lower LCD screen resolution than the LCD’s built-in native resolution. The video cards can combine the pixels and turn a higher resolution into lower resolution, or just use part of the full screen. But video cards can’t do the magic to exceed the native resolution.

NDSsi uses only “Grade A” LCD panels in all of its products, while many competitors use “Grade B” panels in order to save cost, and as a result compromise quality. In medical applications, it is important not to compromise the quality of the displayed image since it is often the basis for making clinical decisions. The following tables and images show the differences between “Grade A” and “Grade B” LCD panels in terms of different types of allowable defects.

There are essentially two different types of pixel defects, bright (stuck pixels) and dark (dead pixels).The table and images below show the differences between Grade A and Grade B LCD panels in terms of allowable pixel defects.

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