Klasifikasi dan titik pengetahuan lampu latar LCD
Apr 15, 2022
Klasifikasi dan titik pengetahuan panel lampu latar LCD
Lampu latar ialah komponen optik yang menyediakan sumber cahaya bahagian belakang dalam produk paparan LCD. Memandangkan kaca kristal cecair itu sendiri tidak mempunyai sifat pemancar cahaya-, sumber pemancar cahaya-iaitu panel lampu latar akan ditambah di belakang kaca kristal cecair seperti yang diperlukan. Rangkaian aplikasi meliputi perubatan, kecantikan, instrumentasi, peralatan kenderaan, peralatan industri, terminal bank, automasi pejabat, komunikasi, mainan elektronik dan produk pengguna.
Prinsip kerja panel lampu latar:
Prinsip kerja lampu latar LED adalah untuk menukar sumber cahaya titik (LED) menjadi sumber cahaya permukaan (lampu latar, lampu latar)
Klasifikasi papan lampu latar:
Pada masa ini, terdapat terutamanya tiga jenis panel lampu latar: EL, CCFL dan LED mengikut jenis sumber cahaya. Mengikut kedudukan pengedaran sumber cahaya, ia dibahagikan kepada jenis tepi dan jenis langsung (jenis lampu latar bawah).
Berikut adalah pengenalan ringkas kepada mereka:
◆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.
Jenis lampu latar bawah: Ia adalah sumber cahaya permukaan rata dengan struktur tertentu. Ia boleh menjadi sumber cahaya permukaan yang berterusan dan seragam, seperti EL atau lampu pendarfluor rata; ia juga boleh terdiri daripada banyak sumber cahaya titik, seperti LED matriks titik atau lampu pijar. Panel lampu latar, dsb. Yang biasa digunakan ialah matriks titik LED dan lampu latar EL.
◆ 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.
Oleh kerana frekuensi dan voltan keluaran beban IC Pemacu semasa tidak dapat mencapai keadaan biasa EL (400Hz, AC100V), kecerahan adalah lebih rendah daripada pemanduan penyongsang. Baru-baru ini, panel cahaya putih (warna penuh) EL dan lampu latar LCD turut keluar satu demi satu. Walau bagaimanapun, disebabkan kecerahan yang lebih gelap, ia pada asasnya digunakan untuk paparan kristal cecair bersaiz kecil di bawah 4 inci. Seperti: telefon mudah alih, PDA, konsol permainan, dll. Penuh-warna (cahaya putih), panel lampu latar kecerahan bersaiz besar-dan kini arus perdana masih menggunakan CCFL sebagai sumber cahaya.
◆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.
