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Home » Resource Center » Glossary
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ScreenTek is proud to provide you this glossary of common terms in the laptop LCD screen industry, and in the laptop notebook industry. Feel free to become more familiar with the terms we use throughout our site. If you notice any glaring omissions, we'd be glad to hear about those. Drop us a line at sales@screentekinc.com.
Angle of incidence
The angle at which a ray of light strikes the surface of an object. A ray of light located directly in front of a surface has an angle of incidence of 0 degrees. In addition, the angle of incidence always equals the angle of reflection.
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Angle of reflection
The angle at which a ray of light is reflected from the surface of an object. A ray of light reflected directly back to the light emitting source has an angle of reflection of 0 degrees. In addition, the angle of incidence always equals the angle of reflection.
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Color chromaticity (CIE)
The aspect of color that includes consideration of its dominant wavelength and purity.
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Color saturation
Refers to the intensity of a color or is a measurement of its purity.
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Color temperature
A simplified way to characterize the spectral properties of a light source. Lower color temperature indicated warmer light (red/yellow), while high color temperature indicated a colder (blue) light.
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Diffuse reflection
A reflection from a rough or matte surface which creates a beam of scattered light, with no directional dependence. In the image at right, the green lines represent the image and the light blue lines represent the reflected image.
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Glare
A beam or ray of light being emitted from a light source. Glare is commonly, yet incorrectly, used in place of technically a phenomenon related to the surrounding environment of a display, and as such, is beyond the ability of the display engineer to directly control. As used commonly by display users, however, glare refers to a reflection from the display which is highly distracting. Typically a user will call an obvious reflection of a white shirt in a display as a glare which reduces his ability to perform his tasks. This is actually more correctly a specular reflection (see Reflections on Reflections). Treatments of the surface to minimize this are referred to as antiglare or antireflection treatments. Antireflection treatments reduce the difference in refractive index between air and the display in a way which is the optical equivalent to impedance matching in electronics. Antiglare treatments, on the other hand, leave the impedance mismatch present, but cause the reflections to be scattered into all directions.
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Illuminance
The total luminous flux incident per unit area. It refers to the amount of incident light.
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Illuminance meter
Measures the brightness of illuminated objects.
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Lambertian distribution
A sum of reflections in all directions. When a surface is composed of numerous surfaces, such as a polarizer, the overall observed reflection becomes the sum of the individual reflection. This is characterized by a distribution known as the Lambertian distribution. In the image at right, the green lines represent the incoming light and the blue lines the reflected light. Taken in aggregate, the blue lines make up the lambertian distribution of light reflected from the surface.
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Luminance
The quality of being luminous, either emitting or reflecting light.
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Luminance meter
Instrument for measuring the amount of light falling on or being reflected by a subject.
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Nit
Unit of luminance. 1 nit = 1 candela / square meter; or, 1 nit = 1 cd/m2. It's a measure of brightness for computer monitors, flat panel displays, and LCD screens. Nit is not an SI unit of measure; the SI unit for luminance is candelas per square meter.
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Parallel transmittance %
The degree to which beams of light are reflected from an object pass through a material within a predetermined small range of angles
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Reflection
An occurrence of reflecting; the return of light or sound waves from a surface.
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Reflective
A viewing mode which uses ambient or other front lighting to provide the illumination for the display.
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Refraction
The change in direction of a wave passing from one medium to another caused by its change in speed.
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Refraction index
The ratio of the speed of radiation (as light) in one medium (as a vacuum) to that in another medium.
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Specular reflection
A well defined beam resulting from reflection off of a smooth surface. In the image at right, the green lines represent the image and the light blue lines represent the reflected image.
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Support color
The amount of color that can be displayed
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Transmittance
The fraction of incident light at a specified wavelength that passes through a sample.
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Wavelength
The distance between one peak of a wave and another, both in the same wave pattern.
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Glossary index
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"I just received a new LCD screen from you, and it works great! I used your online video directions of how to replace a screen and I am sure I saved myself some bucks there. Thanks for the great service and products! Keep doing the same things!" - Katharine W.
"I have to tell you ... when I ran over my laptop in my Jeep Cherokee a few weeks ago, I thought it was a goner! Thanks for keeping me updated during ordering." - Phil S.
"Thanks Chris. The installation was a breeze. My daughter is back in business with the laptop." - George G.
"Bryant - You're the man! You had our order here promptly - even with [Hurricane] Rita on your doorstep!" - Tom
"When my lap top screen first broke, I was pretty upset. At that point, I was left with two options; buy a new laptop at a cost close to plus set up time or send my laptop into HP, pay close to and wait 4-6 weeks. Thanks to ScreenTek I was able to save close to dollars have the screen sent to me in two days and with help from a local repairman be back to work. Great Job!" - Chris R.
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"When I called Dell to find out where the display [I ordered from them] is just before I called you folks, they told me it had never been ordered ... You can just imagine my pleasure in calling ScreenTek late in the afternoon to order the LCD display, and having it show up the next day!" - Jeff H.
"I'm very happy with your service. Everything went smoothly, order, payment, delivery, installation (thanks to instructions at your web site)." - Damir I, from Croatia
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