Multi-User Interactive Coffee Table

Touch Recognition (Figure A, B, E):

• Recognition of the touch events accomplished by flooding a special transparent plastic which contains embedded diffuser particles with IR (infrared) light from LEDs (Light Emitting Diodes) in a non-human-visible wavelength spectrum of about 850 nm;
• a camera that captures the plate from beneath has its IR filter removed camera, which blocks visible light, ‘seeing’ only the points where the light leaves the plate (and not any other visible stuff like a projected image on the same surface);
• an imaging techniques, namely blob-detection, wherein these light spots are identified and tracked;
• the same plate also used as the projection surface for the application;
• touch detection established by flooding IR light through the edges of the plastic material;
• transparent plastic itself must containing embedded diffuser particles at a high concentration which requires an 8 mm thickness;
• concentration of these particles that highly reflects and intensifies the infra-red light and produces a 91.0% Transmission rate;
• LED lights themselves that have been custom modified using super thin flexible PCB which allows perfect molding around the four corners of the plastic;
• LED's tightly packed together with less than half an inch between each LED (approx. 0.47 inches) and the viewing angle of each LED is 120 degrees to provide increased edge lighting in order to create an increased illumination of the surface;
• IR LED lights placed around this special plastic with 850 nm wavelength and ensuring the LED's contain a 120 degree viewing angle so that the IR lights completely illuminates the entire plastic, creating an Infra-Red aura effect in and above the plastic;
• a situation wherein pressing down or placing an object upon the plastic pushes away the lighting and leaving an outline to be detected by an Infra-Red camera (modified to view light only in the 850 mw wavelength) positioned below the plastic;
• the IR camera below that sees the entire plastic flooded with light, the lack of light produces an ID, this ID is then translated into an X/Y coordinate and communicated to the software.

Separation and Backlighting Technique for the LCD (Figure A, B):

• An LCD must be modified such that the backlight (usually containing a panel of compact florescent tubes and inverter board) is removed leaving only the LCD matrix in order to achieve object recognition and touch recognition with using an LCD;
• our own backlight mechanism which has a separation of at least 12 to 20 inches of distance from the LCD Matrix;
• the backlight placed on the bottom of the base comprised of 5 high powered 12 W 6000-7000 k pure white LED strips, each strip containing 12 LED lights of 1 W each with a life span of 50000 hours each for product longevity which produce enough light to light up the Matrix panel above;
• a diffuser placed directly below the LCD and placed inside the aluminum frame in which the LCD matrix rests upon in order to obtain a clear image and even distribution of light across the LCD matrix.