Image capture device with projected display
First Claim
Patent Images
1. A device for displaying an image having first and second image portions in response to an image signal, comprising:
- a first light source responsive to a first input signal to emit a first modulated light beam along a first light path relative to the first light source;
a scanner having an input positioned along the first light path, the scanner being operative to receive the first modulated light beam and to redirect the first modulated light beam through a selected scan path toward a first image region in which the first modulated light beam defines a first image portion; and
electronic control circuitry having an input port for receiving the image signal and a first output coupled to the first light source, the control circuitry being responsive to the image signal to produce the first input signals, the control circuit further including;
an error circuit responsive to a determined error in the first modulated beam intensity to produce an error signal;
a correction circuit having an input coupled to the error circuit, the correction circuit being responsive to the error signal to adjust the first input signal to reduce the determined error.
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Abstract
linear or 2D bar code scanner, the results of a decode attempt may be used to determine the contents of projected information. When a “no decode” is returned, the user may be prompted to scan again. When a decoded symbol includes directly useful data, all or a portion of the data may be projected. When the data refers to a look-up table, information from the look-up table may be projected. The device may additionally project finder patterns to aid aiming.
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Citations
52 Claims
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1. A device for displaying an image having first and second image portions in response to an image signal, comprising:
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a first light source responsive to a first input signal to emit a first modulated light beam along a first light path relative to the first light source;
a scanner having an input positioned along the first light path, the scanner being operative to receive the first modulated light beam and to redirect the first modulated light beam through a selected scan path toward a first image region in which the first modulated light beam defines a first image portion; and
electronic control circuitry having an input port for receiving the image signal and a first output coupled to the first light source, the control circuitry being responsive to the image signal to produce the first input signals, the control circuit further including;
an error circuit responsive to a determined error in the first modulated beam intensity to produce an error signal;
a correction circuit having an input coupled to the error circuit, the correction circuit being responsive to the error signal to adjust the first input signal to reduce the determined error. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An image display for producing an image in an image field in response to an image signal, comprising:
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an input terminal that receives the image signal;
an input circuit coupled to the input terminal, the input circuit being responsive to the image signal to produce a drive signal corresponding to the image signal;
a correction circuit having a signal input coupled to the input circuit, an error signal input, and a correction circuit output, the correction circuit being responsive to the drive signal at the signal input and an error signal at the error signal input to produce a corrected drive signal;
a scanning light source having an input port coupled to the correction circuit output, the scanning light source being responsive to the corrected drive signal to produce a first modulated light beam and to scan the first modulated light beam through a first scanning pattern, the scanning light source having a nominal output response that deviates from a desired output response; and
an error signal source having an error signal output coupled to the error signal input, the error signal source being operative to produce the error signal as a function of the deviation of the nominal output response from the desired output response. - View Dependent Claims (18, 19, 20, 21)
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22. A device for providing a selected image at a viewing location in response to an image signal, comprising:
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a light source responsive to an input signal to emit an optical beam modulated according to the respective input signal, the light source having a variable intensity versus input signal response;
a scanning assembly positioned to receive the modulated optical beam and operative sweep the modulated beam through a corresponding region of the viewing location to produce the image; and
a correction circuit having an input terminal for receiving the image signal and an output port coupled to the light source, the correction circuit being responsive to the image signal and to variations in the intensity versus input signal response to produce the input signal that is not a constant function of the image signal. - View Dependent Claims (23, 24, 25, 26, 27)
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28. A method of producing an image for viewing with a scanning display having a light emitter in response to an image signal representing a desired image, the light emitter having a response that varies as a function of patterns in the image, comprising the steps of:
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identifying a nominal driving signal corresponding to the desired image;
responsive to the image signal, predicting a variation in the light emitter response;
producing an electrical signal indicative of the predicted variation;
responsive to the identified nominal driving signal and the electrical signal indicative of the predicted variation, producing a corrected driving signal;
responsive to the corrected driving signal, producing a light beam that is modulated according to the corrected driving signal; and
scanning the light beam through a selected scan pattern to produce the image. - View Dependent Claims (29, 30, 31)
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32. A display apparatus for viewing an image in response to an image signal, comprising:
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a scanning system having a light input and a light output;
a modulated light source, including;
a light emitter having an electrical signal input and being responsive to an input signal at the signal input to produce modulated light having an intensity corresponding to the input signal; and
an electronic controller having an image input for receiving the image signal and a signal output coupled to the signal input of the light emitter, the electronic controller including a memory buffer for storing data corresponding to the image signal, a weighting circuit coupled to the memory buffer and operative to determine a correction factor in response to the stored data, and a multiplier circuit coupled to the memory buffer, the weighting circuit, and the signal output, the multiplier circuit being responsive to the stored data and the correction factor to produce the input signal at the signal output. - View Dependent Claims (33, 34, 35, 36, 37)
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38. An apparatus for compensating for variations in an L-I response of a light emitter in a scanning display, comprising:
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an intensity monitor optically coupled to the light emitter;
a reference signal source that provides a reference signal indicative of a desired intensity;
a comparing circuit coupled to the intensity monitor in the reference signal source and operative to produce an error signal indicative of the difference between a monitored intensity and the desired intensity; and
a correction circuit having a first input coupled to the comparing circuit, a second input configured to receive a driving signal for the light emitter, and a correction circuit output coupled to the light emitter, the correction circuit being responsive to the error signal and the driving signal to produce a corrected driving signal at the correction circuit output. - View Dependent Claims (39, 40)
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41. A method of stabilizing light intensity in a display, comprising steps of:
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producing a drive current in response to an input signal;
determining a desired intensity of light in response to the input signal;
monitoring an actual intensity of light produced in response to the drive current;
determining a deviation between the monitored actual intensity of the light and the desired intensity of light; and
scaling the drive current in response to the determined deviation. - View Dependent Claims (42, 43, 44, 45, 46, 47)
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48. A method of compensating for pattern dependent heating in a scanning beam display, comprising:
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receiving an input signal representing a desired image for display;
storing in a memory device a digital representation of a portion of the input signal;
retrieving a first set of data from the memory device;
predicting a thermal effect in response to the retrieved first set of data;
retrieving a second set of data from the memory device, the retrieved data representing a selected image portion;
determining a drive signal in response to the second set of data; and
adjusting the drive signal in response to the predicted thermal effect. - View Dependent Claims (49, 50, 51, 52)
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Specification