Abstract: An exemplary method for making backlight module frame includes: providing a plurality of metallic sheets cooperatively defining a frame shape, and a positioning device comprising a worktable and a plurality of positioning portions defined at corners of the worktable, wherein each metallic sheet comprises a first positioning protrusion corresponding to the positioning portions, positioning the metallic sheets on the worktable of the positioning device with the first positioning protrusions of the metallic sheets engaging with the positioning portions of the positioning device, welding the metallic sheets together to form a semi-manufactured frame, and pressing the semi-manufactured frame to form a backlight module frame.

Abstract: An exemplary method for making backlight module frames includes: method includes: providing a first metallic sheet and a second metallic sheet, each of the first and second metallic sheets having at least two L-shaped portions connected side by side and oriented in the same direction; welding the two metallic sheets to form a plurality of connected semi-manufactured frames corresponding to s subsequent backlight module frame; and pressing the connected semi-manufactured frames to form a plurality of backlight module frames. The method costs less welding time and it is convenient for the backlight module frames to be mass-produced.

Abstract: A backlight module frame having a plurality of optical elements includes a bottom frame, a plurality of fixing members, and two pre-assembled members. Each pre-assembled member has a latching portion. The optical elements are stacked together and fixed to the latching portions of the pre-assembled members. The pre-assembled members are fixed to the bottom frame with the fixing members.

Abstract: An exemplary optical plate includes a first transparent layer, a second transparent layer and a light diffusion layer. The light diffusion layer is between the first and second transparent layers. The light diffusion layer, the first and second transparent layers are integrally formed. The light diffusion layer includes a transparent matrix resin and a plurality of diffusion particles dispersed in the transparent matrix resin. Both the first and second transparent layers define a plurality of spherical protrusions on an outer surface thereof distalmost from the light diffusion layer respectively. A method for making the optical plate is also provided. In addition, a direct type backlight module using the optical plate is also provided.

Abstract: A method for making a prism sheet includes: providing a cutting device comprising a cutter, a table plate, and a control unit, the table plate controlled to move up and down by the control unit, and the cutter having a blade rotatable; providing a mold insert preform on the table plate, the mold insert preform having a flat surface; moving the cutter to etch the flat surface of the mold insert preform along a first direction, and simultaneously driving the table plate to move up and down by the control unit in a first predetermined manner to form first elongated depressions in the flat surface; moving the cutter to etch the flat surface of the mold insert preform along a second direction to form second elongated depressions in the flat surface, thereby forming a mold insert; using the mold insert to form the prism sheet by injection molding method.

Abstract: An exemplary optical plate includes a first transparent layer, a second transparent layer and a light diffusion layer. The light diffusion layer is between the first and second transparent layers. The light diffusion layer, the first and second transparent layers are integrally formed. The light diffusion layer includes a transparent matrix resin and a plurality of diffusion particles dispersed in the transparent matrix resin. The first transparent layer includes a plurality of elongated V-shaped protrusions at an outer surface thereof that is distalmost from the second transparent layer. The second transparent layer includes a plurality of micro-recesses at an outer surface thereof that is distalmost from the first transparent layer. Each micro-recess is a frustum of an inverted pyramid in shape. A direct type backlight module using the optical plate is also provided.

Abstract: An exemplary optical plate includes a first transparent layer (21), a second transparent layer (23) and a light diffusion layer (22). The first transparent layer includes an outer surface (210) and a plurality of first conical frustum-shaped depressions (211) defined at the outer surface. The second transparent layer includes an outer surface (230) and a plurality of second conical frustum-shaped depressions (231) defined at the outer surface. The first transparent layer, the light diffusion layer, and the second transparent layer are integrally formed, with the first transparent layer in immediate contact with the light diffusion layer, and the second transparent layer in immediate contact with the light diffusion layer. The light diffusion layer includes a transparent matrix resin (221) and a plurality of diffusion particles (222) dispersed in the transparent matrix resin.

Abstract: A backlight module includes a frame, a plurality of lamps in the frame, and an optical plate including a main body having a light input surface, and a light output surface opposite to the light input surface. The light input surface is adjacent to the lamps, and at least one bracket extension is integral with one end of the main body for fixing the optical plate to the frame. The at least one bracket extension includes a top surface for supporting a liquid crystal display panel, a side surface connecting with the top surface and being farthest from the main body, and a protecting protrusion located on the side surface for protecting a drive circuit connected to the liquid crystal display panel.

Abstract: A method for making a prism sheet includes: providing a cutting device comprising a cutter, a table plate, and a control unit, the table plate controlled to move up and down by the control unit, and the cutter having a blade rotatable; providing a mold insert preform on the table plate, the mold insert preform having a flat surface; moving the cutter to etch the flat surface of the mold insert preform along a first direction, and simultaneously driving the table plate to move up and down by the control unit in a first predetermined manner to form first elongated depressions in the flat surface; moving the cutter to etch the flat surface of the mold insert preform along a second direction to form second elongated depressions in the flat surface, thereby forming a mold insert; using the mold insert to form the prism sheet by injection molding method.

Abstract: An exemplary prism sheet includes a transparent main body. The main body includes a first surface and a second surface. The first surface and the second surface are on opposite sides of the main body. The first surface and the second surface define a plurality of first micro-depressions and a plurality of second micro-depressions respectively. Each first micro-depression is defined by four connecting curved inner sidewalls. A transverse width of each curved inner sidewall of each first micro-depression progressively decreases with increasing distance from the first surface. Each second micro-depression is defined by four connecting inner sidewalls. A transverse width of each inner sidewall of each second micro-depression progressively decreases with increasing distance from the second surface. A backlight module using the present prism sheet is also provided.

Abstract: An exemplary prism sheet includes a transparent main body. The main body includes a first surface, a second surface and a plurality of spherical micro-depressions and a plurality of triangular pyramidal micro-depressions. The first surface and the second surface are on opposite sides of the main body. The spherical micro-depressions are formed in the first surface and the triangular pyramidal micro-depressions are formed in the second surfaces. A backlight module using the present prism sheet is also provided.

Abstract: An exemplary prism sheet includes a transparent main body. The transparent main body has a surface. A plurality of first elongated micro-protrusions and second elongated micro-protrusions protrude from the surface of the main body. Each of the first elongated micro-protrusions extends along a first direction. Widths and heights of each of the first elongated micro-protrusions vary along the first direction. Each of the second elongated micro-protrusions extends along a second direction that intersects with the first direction. Widths and heights of each of the second elongated micro-protrusions vary along the second direction. A method for making the prism sheet and a liquid crystal display device using the prism sheet are also provided.

Abstract: An exemplary prism sheet includes a transparent main body. The main body includes a first surface, a second surface and a plurality of conical frustum micro-depressions and a plurality of triangular pyramidal micro-depressions. The first surface and the second surface are on opposite sides of the main body. The conical frustum micro-depressions are formed in the first surface and the triangular pyramidal micro-depressions are formed in the second surfaces. A backlight module using the present prism sheet is also provided.

Abstract: An exemplary prism sheet includes a transparent main body. The main body includes a first surface and a second surface. The first surface is opposite to the second surface. A plurality of micro-depressions are defined in the first surface. A plurality of elongated arc-shaped protrusions are formed on the second surface. Each micro-depression is defined by four connecting sidewalls. A transverse width of each sidewall of each micro-depression progressively decreases with increasing distance from the second surface. A backlight module using the present prism sheet is also provided.

Abstract: An exemplary prism sheet includes a transparent main body. The main body includes a first surface and a second surface. The first surface is opposite to the second surface. A plurality of elongated V-shaped protrusions are formed on the first surface. A plurality of micro-depressions are defined in the second surface. Each micro-depression is defined by at least three connecting inner sidewalls. A transverse width of each inner sidewall of each micro-depression progressively decreases with increasing distance from the second surface. A backlight module using the present prism sheet is also provided.

Abstract: An exemplary process for making a light guide includes the steps of: providing a transparent base sheet; punching the base sheet to form an array of first apertures therein; coating a melted resin material in the first apertures and making the melted resin material fill up the first apertures; solidifying the melted resin material to form a plurality of resin blocks; punching the base sheet to form an array of second apertures in the resin blocks, the second apertures configured for illuminating the keys via at least one light source; and trimming the base sheet with the second apertures to form a light guide. A light guide made by the process is also provided.

Abstract: An exemplary prism sheet includes a transparent main body. The main body includes a first surface, a second surface opposite to the first surface, a plurality of spherical depressions formed in the first surface, and a plurality of triangular pyramidal depressions and hexagonal pyramidal depressions formed in the second surface. Each of the triangular pyramidal depressions is surrounded by three adjacent hexagonal pyramidal depressions. A backlight module using the present prism sheet is also provided.

Abstract: An exemplary prism sheet (20) includes a transparent main body. The main body includes a first surface (201), a second surface (202) opposite to the first surface, a plurality of first micro-depressions (203) defined in the first surface, and a plurality of second micro-depressions (204) defined in the second surface. Each of the first micro-depressions is conical frustum-shaped. Each of the first micro-depressions has four inner side surfaces connected to each other. A transverse width of each inner side surface of the first micro-depressions progressively decreases with increasing distance from its bottom surface that are coplanar with one of the first surface of the transparent main body. A backlight module (200) using the present prism sheet is also provided.

Abstract: An exemplary prism sheet includes a transparent main body. The main body includes a first surface and a second surface. The first surface is opposite to the second surface. A plurality of elongated arc-shaped depressions are defined in the first surface. A plurality of micro-depressions are defined in the second surface. Each micro-depression is defined by at least three connecting sidewalls. A transverse width of each sidewall of each micro-depression progressively decreases with increasing distance from the second surface. A backlight module using the present prism sheet is also provided.

Abstract: An exemplary method for making backlight module frame includes: providing a plurality of metallic sheets cooperatively defining a frame shape, and a positioning device comprising a worktable and a plurality of positioning portions defined at corners of the worktable, wherein each metallic sheet comprises a first positioning protrusion corresponding to the positioning portions, positioning the metallic sheets on the worktable of the positioning device with the first positioning protrusions of the metallic sheets engaging with the positioning portions of the positioning device, welding the metallic sheets together to form a semi-manufactured frame, and pressing the semi-manufactured frame to form a backlight module frame.