Klasifikasyon ak pwen konesans nan ekleraj LCD
Apr 15, 2022
Klasifikasyon ak pwen konesans nan panno ekleraj LCD
Backlights yo se eleman optik ki bay yon sous limyè dèyè nan pwodwi ekspozisyon LCD. Piske glas kristal likid la li menm pa gen pwopriyete limyè -emisyon, yon sous limyè-emisyon, se sa ki, yon panèl ekleraj, yo pral ajoute dèyè glas kristal likid la jan sa nesesè. Ranje aplikasyon an kouvri medikal, bote, instrumentation, ekipman machin, ekipman endistriyèl, tèminal labank, automatisation biwo, kominikasyon, jwèt elektwonik ak pwodwi konsomatè.
Prensip k ap travay nan panèl ekleraj la:
Prensip k ap travay nan ekleraj la ki ap dirije se vire yon sous limyè pwen (ki ap dirije) nan yon sous limyè sifas (retroéclairage, ekleraj)
Klasifikasyon tablo ekleraj:
Kounye a, gen sitou twa kalite panno ekleraj: EL, CCFL ak dirije selon kalite sous limyè. Dapre pozisyon distribisyon sous limyè a, yo divize an kalite kwen ak kalite dirèk (kalite ekleraj anba a).
Men yon ti entwodiksyon sou yo:
◆Edge-light type: A backlight plate made by placing a linear or point light source on the side of a specially designed light guide plate. According to the needs of actual use, it can be made into a bilateral type or even a trilateral type. The edge light type backlight can generally be made very thin, but the light utilization rate of the light source is small, and the thinner the light source, the smaller the utilization rate, about 50 percent . The core of its technology is the design and production of light guide plates. Edge light type commonly used LED backlight and CCFL backlight.
◆LED light backlight: LED light is also called light-emitting diode. Compared with other light sources, the power consumption of a single LED light is very small. From blue to red, LED lights have many colors, commonly used such as "Table 1" and "Table 2"; another special color is white, and "Table 3" gives its commonly used chromaticity range. In various colors, it can be roughly divided into two types: high light and low light: basically, "Table 1" belongs to low light (although amber, orange and red also have slightly high light), "Table 1" belongs to low light 2" and "Table 3" are highlighted.
Since white is a mixed color and has no identifiable wavelength value, it is represented by its coordinate value on the chromaticity diagram. We customize it as "Cool White" and "Warm White". In all kinds of colors, there is a problem of color deviation, among which blue and white are more obvious, especially white, and now LED suppliers cannot effectively control it.
◆CCFL backlight: The great advantage of this type of backlight is high brightness, so it is basically used in black and white negative phase, blue mode negative phase and color liquid crystal display devices with large area. In theory, it can make various colors according to the color matching principle of three primary colors. The disadvantage is that the power consumption is large, it needs to be driven by an inverter circuit, and the operating temperature is narrow, which is between 060 degrees, while other backlight boards such as LED can reach -2070 degrees.
Kalite ekleraj anba: Li se yon sous limyè sifas ki plat ak yon estrikti sèten. Li kapab yon sous limyè sifas kontinyèl ak inifòm, tankou EL oswa plat fliyoresan lanp; li kapab tou konpoze de anpil sous limyè pwen, tankou dot matris dirije oswa lanp enkandesan. Panno ekleraj, elatriye yo souvan itilize yo se dirije dot matris ak EL ekleraj.
◆ EL backlight: that is, electroluminescence, which is a cold light source that emits light by the intrinsic luminescence of phosphors excited by an alternating electric field. Its great advantage is that it is thin, and it can achieve a thickness of 0.20.6mm. The disadvantage is that the brightness is low, the life is short (usually 30005000 hours), it needs to be driven by inverter, and there will be flickering, noise and other defects due to the interference of the circuit. There are two types of EL drivers: inverter and Driver IC driver.
Paske frekans ak vòltaj pwodiksyon chaj aktyèl la chofè IC pa ka rive nan kondisyon tipik EL (400Hz, AC100V), klète a pi ba pase sa yo ki nan kondwi varyateur. Dènyèman, limyè blan (plen koulè) EL ak LCD panno ekleraj te tou soti youn apre lòt. Sepandan, akòz klète ki pi fonse, li se fondamantalman itilize pou ti -gwosè kristal likid ki pi ba pase 4 pous. Tankou: telefòn mobil, PDA, konsole jwèt, elatriye. Plen -koulè (limyè blan), gwo -panno ekleraj klète gwosè, e kounye a, endikap la toujou ap itilize CCFL kòm sous limyè.
◆LED bottom backlight: The advantages are good brightness and good uniformity. The disadvantage is that the thickness is large (greater than 4.0mm), the number of LEDs used is large, and the heating phenomenon is obvious. Generally, low-bright colors are used for design, and high-bright colors are basically ignored due to the high cost.
