| 摘要 |
A light guide plate (1) comprises a plate body (11) and a light coupler (12) connected to one end of the plate body (11). The light coupler (12) comprises a light-incident surface (121), a connection surface (122) parallel to and opposite to the light-incident surface (121), and a top surface (123) and a bottom surface (124) respectively connected to the light-incident surface (121) and the connection surface (122). The connection surface (122) and the plate body (11) are connected. The width of the light-incident surface (121) is greater than the width of the connection surface (122). The top surface (123) is a wedge-shaped inclined plane protruding upward. The bottom surface (124) is a wedge-shaped inclined plane protruding downward. The light-incident surface (121) is provided with at least one mounting groove (1211). Provided are a back light module (BL) having the above light guide plate (1) and a liquid crystal display device containing the BL. By providing the light coupler (12) having a double-inclined plane wedge, the provided light guide plate (1) and the BL can reduce light leakage from a front surface and bottom surface of a light source, and increase a light-coupling efficiency of the light source (2) and the light guide plate (1). |
