Backlight module

• Main Authors: CHENG, WEI-HSUAN, HSU, CHUN-HSIANG, LIN, YEN-HAO
• Format: Patent
• Language: Chinese; English
• Published: 21.07.2022
• Subjects: DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICAL LOGIC ELEMENTS; OPTICS; PHYSICS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF

A backlight module including a light guide plate, a light source, an upper prism sheet, and a lower prism sheet is provided. The light guide plate has a light incident surface and a light emitting surface. The light incident surface is connected to the light emitting surface. The light source is disposed at a side of the light incident surface of the light guide plate. The upper prism sheet is disposed at a side of the light emitting surface of the light guide plate. The upper prism sheet includes an upper substrate and a plurality of first prism microstructures. The first prism microstructures are isosceles triangles, and apexs of first prism microstructures fall within a range of 80 to 90 degrees. The lower prism sheet is disposed between the light guide plate and the upper prism sheet. The lower prism sheet includes a lower substrate and a plurality of second prism microstructures. The second prism microstructures are isosceles triangles, and apexs of second prism microstructures fall within a range of 100