Patent Application
20080062704
Referring to
Referring to
Referring to
Referring to
The aforementioned lens structures 10, 20, 30, 40 can be a PMMA (Polymethylmethacrylate), MS (Monostyrene), PS (Polystyrene), or PC (Polycarbonate) material, wherein the light diffusant is only added into the upper layers 11, 21, 31, 41, or is only added into the lower layers 13, 23, 33, 43, or is only added into the middle layers 12, 22, 32, 42, or is added at a same time into the upper and middle layers 11, 12, 21, 22, 31, 32, 41, 42, or is added at a same time into the middle and lower layers 12, 13, 22, 23, 32, 33, 42, 43, or is added at a same time into the upper and lower layers 11, 13, 21, 23, 31, 33, 41, 43, or is added at a same time into the upper, middle, and lower layers 11, 12, 13, 21, 22, 23, 31, 32, 33, 41, 42, 43.
The aforementioned lens structures 10, 20, 30, 40 can be also added with an ultraviolet light absorbent, which can be only added into the upper layers 11, 21, 31, 41, or can be only added into the lower layers 13, 23, 33, 43, or can be only added into the middle layers 12, 22, 32, 42, or can be added at a same into the upper and middle layers 11, 12, 21, 22, 31, 32, 41, 42, or can be added at a same time into the middle and lower layers 12, 13, 22, 23, 32, 33, 42, 43, or can be added at a same time into the upper and lower layers 11, 13, 21, 23, 31, 33, 41, 43, or can be added at a same time into the upper, middle, and lower layers 11, 12, 13, 21, 22, 23, 31, 32, 33, 41, 42, 43.
In a practical application, the advantages of new design can be described below.
Due to environmental protection, high price for acquiring the cold cathode fluorescent lamp and the power adapter, and difficult in acquiring in the new design, the light can be reconfigured through the prismatic lenses to reduce the amount of use of the cold cathode fluorescent lamps, and the light can be scattered to achieve the uniformity by properly adding the light diffusant, so as to shade the non-uniformity of brightness caused by the enlargement of distance between the lamps. In terms of the plate to be extruded, the complexity in manufacturing will not be increased, thereby facilitating the production. Therefore, the new diffuser design is provided with the advantages of improving the function of diffuser and of lowering the cost.
For example, an EML (Electro-absorption Modulator Laser)—the diffuser having a light emission surface which is formed into the prismatic lenses—produced by the present inventor is compared with an EMS (Enhanced Message Service) product. The pitch of prismatic lenses is 0.4 mm, the angle of lens is 110°, the thickness of upper and lower layers is 0.1 mm, and the distance between the lamps is 30 mm. After the diffuser is formed and cut into a proper shape, it is emplaced at a backlight source of direct type cold cathode fluorescent lamp to proceed with the measurement and to compare the results.
In the new design, the passage of light can be adjusted through a change of angle and distribution of the prismatic lenses, and the flexibility of product will be better than that of the conventional product, through adjusting the amount of light diffusant to be added into the surface layers of plate. On the other hand, the diffusion effect of light diffusant is directionless, and manifests an irregular scattering effect. For the light of prismatic lenses, a different structure, shape, and angle can be designed, according to the distance between the lamps, the height from the diffuser, and the gap between the lamp and a reflection plate, in the backlight module. Therefore, in the design of displayers, more space is provided for a designer, such that products can be designed according to different requirements, to improve a utilization of the light.
Accordingly, in the present invention, the surface of plate is formed into the three-dimensional structure in different shape, in order to change the passage of light, along with an addition of different diffusant, such that the light emitted from the CCFL in the backlight module is uniformly scattered, and the amount of use of the cold cathode fluorescent lamps can be decreased, thereby achieving the effect of optical uniformity after the light comes out of the light emission surface.
It is of course to be understood that the embodiments described herein is merely illustrative of the principles of the invention and that a wide variety of modifications thereto may be effected by persons skilled in the art without departing from the spirit and scope of the invention as set forth in the following claims.
