Liquid crystal display useful in a control panel of a vehicle, comprises a transparent liquid crystal screen, a flat light guide, a lighting unit placed at a base of the light guide, first and second varnish layers, and a refill layer

摘要

The liquid crystal display useful in a control panel of a vehicle, comprises a transparent screen (2) of positive type, a flat light guide (3), a lighting unit placed at a base of the light guide, a first varnish layer (50) on a front side (31) of the light guide, a second varnish layer on back side of the light guide, and a refill layer (6) of polycarbonate between the light guide and screen. The front side of the light guide is oriented towards the screen. The light guide has a thickness of 5 mm. The varnish forming the first layer comprises a mixture of cross-linked polymer. The liquid crystal display useful in a control panel of a vehicle, comprises a transparent screen (2) of positive type, a flat light guide (3), a lighting unit placed at a base of the light guide, a first varnish layer (50) on a front side (31) of the light guide, a second varnish layer on back side of the light guide, and a refill layer (6) of polycarbonate between the light guide and screen. The front side of the light guide is oriented towards the screen. The light guide has a thickness of 5 mm. The varnish forming the first layer comprises a mixture of cross-linked polymer comprising acrylate oligomer (30-40%) and acrylate monomer (20-50%), a photoiniator (1-5%), a mineral agent (1-5%), and an additive (0.2-2%). The first varnish layer has a roughness of 0.1-1 mu m. The ratio of refractive index between the light guide and first varnish layer is selected such that to obtain good propagation of light from the lighting unit.