About the photographer for laptop screens (types and the difference between them)
About laptop screens and the difference between them
In this chapter, we will see About simple kinds of screens, and we’ll talk about all the screens and lighting problems and we will try, God willing, that you enumerate all faults and methods of reform
Laptop screens are divided into two types
LED the first type, which is called the
Lighting system relies on this type on a strip of small Allidat bottom of the screen with the ability of 3 volts and be this way
And causing light damage and malfunction can fully change or switch Allidat damaged ones
LCD second type, which is called the
Lighting system relies on this type on a small-sized neon
And causing damage to lighting failure and should be changed in the same size and we will talk about the source of its energy and the way to fix it is also often cause malfunction lighting in the LCD (CCFL) screens
About the screens techniques in general, and the difference between them
LCD
Liquid Crystal Display
Liquid crystal display
Type of display devices using a molecular structure with a polar liquid vehicles polar molecular structure, the subject between the poles of electronic transparent electrodes. And when you pass an electric field, the molecules with molecules lined area, and form crystalline arrangement attracts light passing through it. There polarized component of the chips over the subject of electrodes polarized light filter object. Thus, there is a network of electrodes can be by choice, that the cell operates cell or pixel pixel containing the liquid crystal material, and the Ptotaimha. In some display devices that use liquid crystal, there is a panel optical radiation to electrical behind the screen lit. Here are other types of display devices liquid crystal healing can do a stained offer
First on the screen when we say it is characterized by LED lighting, it means they are a normal LCD screen, but is distinct from other screens different type lighting.
All LCD displays based on the light source external to show the picture as required because it is capable of lighting itself and the screens that exist today in the markets and used by most of us rely on lighting CCFL which is an acronym for Cold Cathode Fluorescent Lamps any lamp Florasent cool while there is a new type of LCD displays It depends on the LED illumination in an acronym for Light-Emitting Diode any light emitting diode or Shining.
LED
Light-Emitting Diode
Valve bi-projector
Shining diode
Is the simplest types of semiconductors and passes the electricity in one direction and blocks it passed the other direction, and makes the LED semiconductor such as Orsnyd gallium component and nitrate Gallium with other materials and characterized by it contains metal elements of solid .mma easy re-screens that rely on LED lighting unlike manufacturing process LCD displays lit with CCFL
Shining White diode: is originally blue but covered with a layer of yellow phosphorus necessary for the production of color spectra of red and green.
Date of this technique
Not considered this technique modern has been developed in the sixties of the last century and is used in lighting digital watches, some optical indicators instead of using incandescent lamp and a 20-year technology was developed dramatically, which drew to the attention engineers animated presentations and presented them all and they all Eetmnoh previously and considered a revolutionary display technology and it will give a lot for fans of high image quality
.
Types of LED backlight
Backlight based on the three types and each one is different from the other in a way distribution of LEDs on the rear panel of the screen and user characteristics of the diode.
The first type of them
Full-Array LED RGB Dynamic
Matrix picture shows bright colored diodes in the form of groups in the way Full-Array LED.
This method is characterized by lighting it covers all the back panel liquid crystal where distributed diodes bright colored regularly in several rows in groups and each group is composed of four colors: red, green, blue, white with integrated color red issued with green and blue to give the white away all Group about other between 1 to 3 inches of these groups is called the matrix of LEDs illuminated, and no panel of private publisher that publishes the light of light coming from this matrix to full screen.
These groups of luminous diodes can be managed by controlling who is the so-called process of “local dimming” can stop any diodes or more group work through the controller, which gives black color is very dark in the specific area where the group stopped working at the same time remaining Other active groups and give the necessary light to illuminate the rest of the image parts in case the image is required, this process gives very great variation and nice chromatic stunning, twice the normal lighting that uses technology CCFL point can not stop Florasent lamp for work never even continue to work all the time and when required it give black color screen to close the light through the crystal to rotate an enclosed space which obscures light but with some infusion and therefore do not give black color as real as give LED technology
The controller, which shuts down the LED Shining work for withholds stop it alone, it shuts down one or more groups of LEDs illuminated, and when extinguishing a combination of them may become full area completely bleak despite the fact that parts of the image requires gradual in dark shadows, or when lighting a combination of them may shining areas is supposed to remain opaque according to the picture, another little sense diodes illuminate the controls a large number of pixels, making it impossible to achieve great accuracy in the contrast between the two parts of the image, one requires the blackest dark and the other requires a strong whiter
Producers have to solve this problem by increasing the number of LEDs illuminated or reduce the number of LEDs managed and controlled but did not go away 100%
On the right: describes the work of the local dimming feature mechanism and how to control Baldyudat illuminated running and close by Mataattalbh image
On the left: work Florasent lamp mechanism describes the cold and inability to close partially.
The current size is large luminous diode not be able to light a single pixel alone in normal screens, but it is a custom in foreign airspace giant screens
The second type
Full-Array White LEDs
It is similar to the previous method, but using only one color of the diode shining a white color instead of the other colors so this reduces manufacturing costs but they can not provide the same depth of color as in the previous method RGB Dynamic and managed a number of companies to develop this technology to improve image quality level as in RGB Dynamic Technology or Triluminos
This method gives the advantage of being adequate lighting in the part that requires the image, which means an increase in contrast and you could find this technique of lighting in LCD-TV screens only this method is most prevalent when we talk about Full-Array LEDs.
As described to you the luminous diodes with white color in the way Full-Array White LEDs Matrix
Type III
Edge-LEDs
A row of luminous diodes are placed on one of the edges of the LCD panel in the way Edge-LEDs
It is simpler and less expensive than previous methods used in most of the screens that rely on LED lighting as used in computers and modern mobile screens deployed in the market today and with relatively reasonable prices.
LEDs illuminated with white color are placed only on the edges of the board of liquid crystal and distributed sheets of reflectors strong at the back for you as opposed to light from the LEDs to the rest of the board areas liquid and especially to the central region and lacked local blackout mainly feature but the manufacturers have developed this technique and add them to some its products to become supportive in some few models
This method enables the making of a very few screens with a thickness of up to 1.2 inches due to the use of a small number of diodes and dispensing publisher of light painting.
Flawed, and they do not give a uniform appearance of any image that we used a white background image will be whiter at the edges of the center and also use it when a black background with black edges will be less dark gray in the middle.
The viewing angle sometimes be less than previous methods because of the light from the publisher painting be better and clearer than light from the reflective sheet.
For cons Edge-LEDs firms manufacturers working to develop this method of lighting and the removal of those defects or mitigate them gradually.
The advantages and drawbacks of the first type and the second Full-Array
– Nice chromatic wide and a large variation
– Large gradients and the fact that the black color
– The average age of the LED very good Shining
– Very good viewing angle
– Energy consumption is relatively acceptable
– Slim screen structure up to a thickness of 1.5 inch
– Does not contain an LED shining on a solid metal elements which facilitates the process of re-manufactured.
– Price is too high up to three times compared with LCD screens lit with CCFL
The advantages and drawbacks Edge-LEDs for
– Low power consumption and up to 30% less than the old ways of lighting.
– Less heat generated from old ways of Aladhae
-mtost Omar diode Shining very good
– The largest lighting narrowly and can be controlled and reduced to low levels.
– Screen structure is very slim up to 1.2 inch thickness
– Does not contain an LED shining on a solid metal elements which facilitates the process of re-manufactured.
– Relatively acceptable price
-zawah Vision less narrowly for Full-Array or old ways of Aladhae
-Do Homogeneity in image quality in some cases, such as with a black color image
– Does not have a noticeable difference in contrast and color gradients for LCD screens lit with CCFL