Lcd Backlight Category Description
Since the LCD itself does not light, in order to enable it to properly display images
, the use of an adequate supply backlight brightness and uniform light source and display images. LCD panel backlight module is one of the key components, LCD panels have been widely used in monitors, notebook computers, digital cameras and projectors and other electronic products, low in the Panel of the stimulation, notebook computers and LCD was not, etc. demand for large size panels increased rapidly, becoming a major source of demand for backlight modules. Backlight light source types are present by EL, CCFL and LED backlight, three types of light distribution according to different positions, is divided into edge-type and direct type (bottom backlit).
First, the edge light type
Is linear or point-like light source installed in a specially designed light guide plate made of backlight side. According to the needs of practical use, but also make bilateral or trilateral type style. Edge light type backlight can do thin, but the utilization of smaller light source, and the utilization of the smaller thinner, most about 50% of the light guide plate technology is the core of the design and production. The most common side light type backlight with LED lights and CCFL backlighting. As a new LED side light type backlight, it has the following three characteristics:
1. The light-emitting surface can be made along the optical axis 360 launch.
2. Can be covered with a thin lens the larger area.
3. Can be blended with a simple structure.
The backlight is divided into two types:
A, LED backlight
LED, also known as light emitting diodes, compared to other light sources, a single LED light power is minimal. From blue to red, LED lights have a variety of colors, plus a special color is white. Years in a variety of colors, can be broadly divided into two bright and low light. Because white is mixed color, no identity value of the wavelength, so its coordinates in a chromaticity diagram to represent the value. We customize the meaning of "cool white" and "warm white" are two. In a variety of colors, the color discrepancies exist, in which the performance of blue and white more obvious, especially in white are difficult to make effective control.
B, CCFL backlight
The biggest advantage of this backlight is a high brightness, so the larger black and white negative phase, blue-mode LCD display negative phase and basically using it. Theoretically, it can be based on three primary colors of color theory to make a variety of colors. The disadvantage is that the larger power, the need to drive inverter circuit, and a narrow operating temperature for 0 to 60 degrees, while the other LED backlighting can be reached between -20 ~ 70.
Second, the direct type (bottom backlit)
In fact, a certain structure is a flat type surface light source, can be a continuous and uniform surface light source, such as EL or a flat fluorescent lamps. Can also be a more point source composition, such as dot matrix LED or incandescent light source and so on. Led dot matrix is used, and EL backlight.
The backlight can also be divided into two types:
A, EL backlight.
That EL is a phosphor by an alternating electric field in the intrinsic excitation light and light-emitting cold light. Its biggest advantage is thin, can do 0.2 ~ 0.6mm thickness. The disadvantage is the low intensity, short life (typically 3,000 to 5,000 hours), to be inverter-driven, but also by the flicker circuit interference, noise and other adverse conditions. Even after another is also white (panchromatic) EL and LCD backlight out. However, due to the brightness of its essentially dark for the following small-size 4-inch LCD display. Such as: mobile phone, PDA, game consoles.
B, LED bottom backlight.
Advantage of good brightness, good uniformity. The disadvantage is thick (greater than 4.0mm), larger number of LED used, heating phenomenon was obvious. Generally use low-light color design, and highlight colors are basically not considered because of high cost.
As with the LED backlight LCD with life, color gamut, transfer rate performance and environmental advantages, it became the acclaimed new generation of LCD backlight, is currently developing vigorously. Direction of development of LED backlight is lower power consumption and cost, light-induced higher, longer life, brighter and thinner and lighter.
by: zerry
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