Analysis of TV backlight module structure

Backlight module (BLU) structure

And requirements for LED; overview; introduction of backlight module; structure of side-light backlight module; structure of direct-type backlight module; comparison of side-light and direct-type backlight; backlight module optical components include:

Light source (CCFL, LED)

Reflective film

Light guide plate (side light type)

Diffusion plate (direct type)

Diffusion film (up and down diffusion)

Brightening film

DBEF; cold cathode tube structure principle; reflective film (Reflector); metal reflection The outermost electrons (free electrons) in the conductor material are not bound by the atomic nucleus. When illuminated by light waves, they are caused by absorbing the energy of light. The oscillation of light at the same frequency, which emits light of the same frequency as the original light, is called light reflection. The higher the sparseness of the metal wire, the shallower the penetration depth and the higher the reflectivity (Reflectivity). Therefore, metal reflective film materials mostly use highly conductive gold, silver, aluminum, and copper. ;The reflection of white plastic material is generally PET+TiO2. TiO2 has a high refractive index (n=2.62). TiO2 is mixed with a resin with high optical transparency, such as PET or polycarbonate, and then finely foamed to form a shot. The diameter of the bubble is about a few microns. The finer the bubble and the higher the density, the higher the reflectivity. The bubble is a material with a refractive index of about 1.00, and forms a good refractive index interface with the transparent resin. The light refracted from the dots enters the reflector and returns most of the light to the LG through very complicated refraction. ;Light guide plate (LGP);;Optical adjustment of light guide plate

Design of outlets. It is used to adjust the brightness and uniformity of the backlight module, mainly by adjusting the distribution, density and size of the dots.

; Other optical adjustments. VCUT design, sawtooth design at light incident.

; Diffusion plate/diffusion film; Brightness enhancement film (BEF); Optical principle of brightness enhancement film; DBEF; Efficiency of optical components; Introduction to TFT-LCD; Schematic diagram of TFT-LCD structure; LED over-frequency spectrum analyzed by simulation and analysis on the camera; Scan Line

Scanning line; backlight requirements for LEDs; for the pressure of narrowing the light guide plate and reducing the number of LEDs, the backlight has always been hoped:; requirements for direct backlight; requirements for TFT-LCD; introduction of backlight LED models