Light guide module and touch display device

• Main Authors: YANG CHANGZHENG, LUO JIANXING, YAN JIANBIN, DAI KAILUN
• Format: Patent
• Language: Chinese; English
• Published: 11.07.2023
• 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

The invention discloses a light guide module and a touch display device. The light guide module comprises a cover plate, a shading layer, a light guide plate and at least one light source, the light shielding layer is disposed below the cover plate and has a width of less than about 4 mm. The light guide plate is arranged below the cover plate. The light guide plate is provided with a reflecting surface and a light-emitting surface which are opposite, and a light-in surface and three side surfaces which are connected between the reflecting surface and the light-emitting surface. The light source is configured to emit light towards the light incident surface. The surface roughness of the side surface ranges from about 300 nanometers to about 400 nanometers, so that the change rate of brightness measured by any two adjacent measurement points in a plurality of measurement points uniformly distributed on the light emitting surface ranges from about 8% to about 12%. Therefore, the problem of light leakage at the