| 主权项 |
1. A LCD backlight screen, including an LED lens, wherein the LED lens includes: a base stand, a first protruding stand set on the base stand and a second protruding stand set on the first protruding stand; a side wall of the first protruding stand and a side wall of the second protruding stand constitute an exit surface, the side wall of the first protruding stand is outside-protruding curved surface structure; a top surface of the second protruding stand is a reflective surface, and the reflective surface is conic concave structure; a bottom of the base stand is set a cylindrical hole for installing LED, and a surface of the cylindrical hole constitutes a incidence surface; light from LED is irradiated inward from the incidence surface, and a part of the light is irradiated outward from the exit surface after reflected by the reflective surface, and a remaining part of the light is irradiated from the exit surface directly,
further comprising: a reflective membrane and scattering plate, and a plurality of LED lenses are set on the reflective membrane and arranged as an rectangular array, the scattering plate is above the reflective membrane and the LED lenses; a row distance between each LED lens is A, a column line distance between each LED lens is B, a distance between the scattering plate and reflective membrane is C and S represents a ratio of distance and height where S=½(A+B)/C, and S is more than or equal to 4.5. |
