Touch detection device with touch interface made of composite material

Abstract

A touch detection device comprises a touch interface (1) made of composite material comprising a lignocellulosic material and a resin, the lignocellulosic material being impregnated with the resin, the fraction of resin being between 30% and 80% by weight relative to the total weight of composite material. The resin impregnated makes it possible to render the touch interface stable irrespective of the temperature and moisture conditions with a view to use both outside and inside. Use of the touch detection device for a touchscreen.

What is claimed is: 
     
         1 . (canceled) 
     
     
         2 . A device comprising a touch interface, wherein said touch interface comprises a lignocellulosic material, wherein said lignocellulosic material comprises lignin and a preserved network of cellulose and hemicellulose present in an organic material, wherein the touch interface is at least partially translucent. 
     
     
         3 . The device of  claim 2 , wherein said touch interface has a light transmission coefficient of greater than 0% 
     
     
         4 . The device of  claim 2 , wherein the lignocellulosic material comprises a refractive index of at least 1.35. 
     
     
         5 . The device of  claim 2 , wherein the lignocellulosic material comprises a refractive index of up to 1.70. 
     
     
         6 . The device of  claim 2 , wherein the lignocellulosic material comprises a refractive index of at least 1.35 and at most of about 1.70. 
     
     
         7 . 
     
     
         8 . The device of  claim 2 , wherein said lignocellulosic material comprises from about 10% to about 60% by weight of said lignin. 
     
     
         9 . The device of  claim 2 , wherein said touch interface further comprises a filter. 
     
     
         10 . The device of  claim 9 , wherein said filter is configured to control an opacity of said touch interface, wherein said opacity is electrically adjustable. 
     
     
         11 . The device of  claim 2 , further comprising a display device configured to display information to said user. 
     
     
         12 . The device of  claim 11 , wherein said touch interface has a light transmission coefficient of greater than 0% and less than 90%. 
     
     
         13 . The device of  claim 11 , wherein the touch interface has a light transmission coefficient of at least 5%. 
     
     
         14 . The device of  claim 2 , wherein an outer surface of the touch interface comprises a grain of the lignocellulosic material, and is configured such that a user will touch the grain of the lignocellulosic material when inputting information into the device. 
     
     
         15 . The device of  claim 2 , wherein the device is configured to receive input from a user from the touch interface. 
     
     
         16 . The device of  claim 2 , wherein the device further comprises electrically conductive particles. 
     
     
         17 . The device of  claim 2 , wherein the device further comprises a first conducting layer in contact with the touch interface. 
     
     
         18 . The device of  claim 17 , further comprising a second conducting layer. 
     
     
         19 . The device of  claim 18 , further comprising an adhesive layer in contact with the first conducting layer or the second conducting layer. 
     
     
         20 . The device of  claim 19 , wherein the adhesive layer is in contact both the first conducting layer and the second conducting layer, and wherein the first conducting layer is complementary to the second conducting layer. 
     
     
         21 . A method of improving transmission of light from a display panel through a touch interface, the method comprising:
 providing a lignocellulosic material comprises lignin and a preserved network of cellulose and hemicellulose present in an organic material;   filling the preserved network of cellulose and hemicellulose with a resin, wherein a refractive index of the resin and a refractive index of the resin of the lignocellulosic material are each between 0.35 of each other; and   passing light emitted from the display panel through the preserved network of cellulose and hemicellulose and the resin.