Hon Hai Precision Industry Co., Ltd.

Tsinghua University

Xing-Peng Yang

Guo-Fan Jin

Ying-Bai Yan

Shou-Shan Fan

Di Feng

Bo Yang

Hai-Tao Liu

Qiao-Feng Tan

A backlight module includes a light guide plate (), a light source (), a reflecting sheet (), a diffusion sheet (), and a reflective polarizing beam splitter (). The light guide plate includes a light input surface (), a light output surface () adjacent to the light input surface, a reflecting surface () opposite the light output surface, and a number of microstructures () located on the reflecting surface. In the light guide plate, stress-induced birefringence is introduced to achieve a polarization state conversion, thereby facilitating efficient use of the light generated by the light source.

Light guide plate having orthogonal stresses or strains and backlight module therewith

A system for designing a free form reflector includes a user input interface (), a free form reflector design unit (), and a free form reflector output unit (). The user input interface is configured for receiving various data associated with a desired free form reflector, via an input device. The free form reflector design unit is installed in a computer and configured for generating an optimum free form surface according to the input data by performing a non-uniform rational basis splines (NURBS) algorithm, a merit evaluation function, and a differential evolution (DE) algorithm. The free form reflector output module is configured for generating a free form reflector according to the optimum free form surface and outputting the free form reflector, in the form of a computer-aided design (CAD) drawing, to a display and/or a printer. A related method is also disclosed.

System and method for designing a free form reflector using genetic algorithm

A light guide device () includes a light guide substrate () and a sub-wavelength grating (). The light guide substrate has a light input surface (), a light output surface () adjacent to the light input surface (), a bottom surface () opposite to the light output surface (). In the light guide plate, stress-induced birefringence is introduced to achieve the polarization state conversion. The SWGlocated on the light output surface includes a top layer () and a bottom layer (). The SWGis configured to work as a reflective polarizing beam splitter, consistent with the principle of rigorous coupled-wave theory.

Light guide device and backlight module therewith

A backlight module () includes a light guide plate (), a light source (), a micro reflector array (), and a reflector (). The light guide plate includes a light input surface () facing the light source, a light output surface () adjacent to the light input surface, and a reflective surface () opposite to the light output surface. The light source and an emitting surface () thereof both face the light input surface. The micro reflector array and the reflector are configured for cooperatively coupling a first portion of the light beams into the light input surface via any corresponding microgap and reflecting a second portion of the light beams into the light guide plate at a location distant from the light source.

Backlight module and reflector thereof

A backlight module includes a light guide plate having an incident surface, an emitting surface adjacent to the incident surface, and a reflective surface opposite to the emitting surface. At least one light source is disposed adjacent the incident surface. The light source has a luminescent surface; and at least one reflecting device is disposed adjacent the light source. The reflecting device has a reflective surface facing the incident surface. At least one semi-transmissive and semi-reflective film disposed on the incident surface of the light guide plate. The semi-transmissive and semi-reflective film and the reflecting device together are disposed for cooperatively reflecting some (i.e., a fraction) of the light beams emitted from the light source and redirecting the fraction of the light beams into the light guide plate through the incident surface, distant from the light source.

Backlight module

An exemplary light guide plate () includes: a light incident portion () for receiving a light; a light reflecting portion () for reflecting the light input through the light incident portion; and a light emitting portion () opposite to the light reflecting portion, for outputting the reflected light. The light incident portion includes a first diffractive optical element () located thereat. The first diffractive optical element includes a plurality of protrusions () each having a curved surface, with the protrusions being arranged symmetrically opposite to each other across a central axis of symmetry of the first diffractive optical element. The light emitting portion may include a second diffractive optical element () located thereat. The second diffractive optical element includes a plurality of elongate protrusions, with the protrusions being arranged symmetrically opposite to each other across a central axis of symmetry of the second diffractive optical element.

Light guide plate and surface light source using same

A light guiding plate () includes a light incident surface (), a light emitting surface () adjacent to the light incident surface, and a bottom surface () opposite to the light emitting surface. The light incident surface includes at least one row of first grooves () and at least one row of second grooves (). The first grooves is configured for increasing a range of incident angles in which light beams enter the light guiding plate via the light incident surface and thereby improving a brightness of the light guiding plate, and the second grooves is configured for complementing the functions of the first grooves thereby improving a uniformity of light output by the light guiding plate.

Light guiding plate and backlight module employing the same

A backlight module includes a light guide plate, a light source, and a reflector. The light guide plate includes an incident surface and a corner adjacent the incident surface. The light source is disposed adjacent the incident surface and the corner of the light guide plate. The light source has an emitting surface. The reflector is disposed substantially facing the incident surface. The reflector has a curved reflective surface facing the emitting surface, the surface being shaped and positioned for uniformly reflecting light beams emitted from the light source into the light guide plate through the incident surface. An angle of inclination of the emitting surface with respect to the incident surface is chosen to be in the range from above about 0 to about 180 degrees. The backlight module can effectively eliminate shadow formation adjacent the incident surface of the light guide plate.

A light guide device () and a backlight module using the same. The light guide device includes: an incident surface (); an emitting surface () adjacent to the incident surface; a reflecting surface () opposited to the emitting surface; a plurality of first V-shaped structures () formed on the emitting surface; and a plurality of second V-shaped structures () formed on the reflecting surface and perpendicular to the first V-shaped structures, wherein respective heigths of the second V-shaped structures increase with increasing distance from the incident surface and respective distances between adjacent second V-shaped structures decrease with increasing distance from the incident surface. The light guide device of the present invention does not need optical elements, and thus has a simple structure. A backlight module using the same light guide plate is also provided.

Light guide device and backlight module using the same

A backlight module () includes a light source () for emitting light, a light guide plate (), and a reflective cover (). The light guide plate includes a light incidence surface (), a light-emitting surface () connecting with the light incidence surface, and a bottom surface () opposite to the light-emitting surface. The light source faces the light incidence surface. The reflective cover includes a reflective unit having two reflective surfaces () defining a space with a bottom. The light source is accommodated in the bottom of the space. A cross-sectional profile of the reflective surfaces is defined by an equation in a polar coordinate &#x3c1;(&#x3c6;). The equation is: wherein, &#x3c1; represents a polar axis of the polar coordinate, &#x3c6; represents a clockwise angle of the polar coordinate, and &#x3b8; represents an anti-clockwise divergence angle of the light.

Growing community of inventors

Beijing, China

Xing-Peng Yang