Display device including function to input information from screen by light
First Claim
Patent Images
1. A display device, comprising:
- a display unit configured to display an image on a screen, and is an image of 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,wherein the sensor drive unit outputs a control signal which controls the drive condition so that upper gradation values including a center in a histogram of gradation values obtained by modulating the output values can be set within a predetermined range,wherein the sensor drive unit decides the control signal by using a table showing a relationship between an exposure time of the optical sensors, a precharge voltage thereof, and the predetermined range.
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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
10 Claims
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1. A display device, comprising:
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a display unit configured to display an image on a screen, and is an image of 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, wherein the sensor drive unit outputs a control signal which controls the drive condition so that upper gradation values including a center in a histogram of gradation values obtained by modulating the output values can be set within a predetermined range, wherein the sensor drive unit decides the control signal by using a table showing a relationship between an exposure time of the optical sensors, a precharge voltage thereof, and the predetermined range. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification