Patent ID: 8624877
Filing Date: 2014-01-07
Classification: G06F,G09G

Abstract:
1. An optical touch display apparatus comprising: a light-transmitting display panel having a first surface and a second surface, the first surface and the second surface being opposite to each other, the first surface having a display area; a backlight module disposed on the second surface; a visible light source configured to emit visible light to the backlight module so that the backlight module guides the visible light entering the inner thereof to the second surface; an invisible light source configured to emit invisible light to the backlight module so that the backlight module guides the invisible light entering the inner thereof to the second surface; an image sensing apparatus, a visual field of the image sensing apparatus facing the top of the light-transmitting display panel, the image sensing apparatus being configured to receive the invisible light so as to sense an image above the display area, the invisible light passing through the second surface and the first surface of the light-transmitting display panel and being directly reflected by a pointer located in the display area into the image sensing apparatus; and a processing circuit, wherein when the pointer is located in the display area and reflects the invisible light which passes through the second surface and the first surface so that the image sensing apparatus senses the invisible light reflected by the pointer, the processing circuit calculates the position of the pointer related to the display area according to the image sensed by the image sensing apparatus.