A lighting device for a display device includes a light source and a light source control device arranged to control the light source. The light source control device is arranged to generate a pulse signal as a light source control signal Vcon to control the light source. The light source control signal Vcon includes pulses, which individually have different shapes.

 
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> CREATION AND PLACEMENT OF TWO-DIMENSIONAL BARCODE STAMPS ON PRINTED DOCUMENTS FOR STORING AUTHENTICATION INFORMATION
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