Display device including function to input information from screen by light
First Claim
1. A display device, comprising:
- a display unit including a display function to display an image on a screen, and an optical input function to image an image of an object which has approached the screen;
an edge detection circuit configured to detect edges of the imaged image, thereby forming an edge image;
a contact determination circuit configured to determine whether or not the object has contacted the screen by using the edge image; and
a coordinate calculation circuit configured to calculate a position coordinate of the object by using the edge image when it is determined that the object has contacted the screen.
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0 Petitions
Accused Products
Abstract
In order to enhance accuracy of determination as to whether an object has contacted a screen and to enhance accuracy of calculation of a coordinate position of the object, edges of an imaged image are detected by an edge detection circuit 76, and by using the edges, it is determined by a contact determination circuit 77 whether or not the object has contacted the screen. Moreover, in order to appropriately control sensitivity of optical sensors in response to external light, by a calibration circuit 93, a drive condition of the optical sensors is changed based on output values of the optical sensors, which are varied in response to the external light.
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Citations
48 Claims
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1. A display device, comprising:
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a display unit including a display function to display an image on a screen, and an optical input function to image an image of an object which has approached the screen;
an edge detection circuit configured to detect edges of the imaged image, thereby forming an edge image;
a contact determination circuit configured to determine whether or not the object has contacted the screen by using the edge image; and
a coordinate calculation circuit configured to calculate a position coordinate of the object by using the edge image when it is determined that the object has contacted the screen. - View Dependent Claims (2, 3, 4, 5)
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6. A display device, comprising:
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a display unit including a display function to display an image on a screen, and an optical input function to image an image of an object which has approached the screen;
an inter-frame difference processing circuit configured to obtain a difference image formed by taking a difference between a multi-gradation image in a current frame and a multi-gradation image in a past frame for the imaged image;
a contact determination circuit configured to determine whether or not the object has contacted the screen by using the difference image; and
a coordinate calculation circuit configured to calculate a position coordinate of the object by using the difference image when it is determined that the object has contacted the screen. - View Dependent Claims (7, 8)
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9. A display device, comprising:
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a display unit including a display function to display an image on a screen, and an optical input function to image an image of an object which has approached the screen;
a modulation circuit configured to convert the imaged image into a multi-gradation image;
an edge detection circuit configured to detect edges by using the multi-gradation image;
an inter-frame difference processing circuit configured to obtain a difference image formed by taking a difference between the multi-gradation image in a current frame and the multi-gradation image in a past frame;
a coordinate calculation circuit configured to calculate a position coordinate of the object by using at least one of an edge image and the difference image; and
a contact determination circuit configured to determine whether or not the object has contacted the screen by using at least one of the edge image and the difference image. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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10. A display device, comprising:
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a display unit including a display function to display plural switches on a screen, and an optical input function to take an image of an object which has approached the switches;
a counting circuit configured to count a number of white pixels for each of the switches for the imaged image, to calculate a difference value between a counted value in a current frame and a counted value in a past frame, and to output, when a maximum one of the difference values for each of the switches is a predetermined threshold value or more, a signal indicating an effect that the object has contacted the switch;
an inter-frame difference processing circuit configured to obtain a difference image formed by taking a difference between a multi-gradation image in the current frame and a multi-gradation image in the past frame, to extract a region showing the object from the difference image, to calculate a center of gravity of the region, and to output a signal indicating an affect that the object has contacted the switch located at the center of gravity;
an edge detection circuit configured to detect edges from the multi-gradation images, to calculate a center of gravity of the edge in which intensity is a predetermined threshold value or more, and to output a signal indicating an effect that the object has contacted the switch located at the center of gravity;
a contact probability calculation circuit configured to calculate a contact probability for each of the switches based on the signals individually outputted from the counting circuit, the inter-frame difference circuit, and the edge detection circuit.
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33. A display device, comprising:
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a display unit configured to display an image on a screen, and to image an object which has approached the screen by using optical sensors; and
a sensor drive unit configured to change a drive condition of the optical sensors based on a statistical amount of output values of the optical sensors. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44)
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45. A display device, comprising:
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a pixel region including plural pixels;
optical sensor elements provided for each of the pixels; and
a determination unit configured to compare a value to be determined, the value being based on multi-gradation data of each of the pixels, and a threshold value with each other in magnitude, the multi-gradation data corresponding to intensity of light received by the optical sensor elements. - View Dependent Claims (46, 47, 48)
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Specification