Projection display system with pressure sensing at screen, and computer assisted alignment implemented by applying pressure at displayed calibration marks
First Claim
Patent Images
1. An interactive display system, comprising:
- a) a touch-sensitive display screen for sensing pressure applied thereto and in response generating control signals indicating locations of said applied pressure,b) structure configured to receive said control signals and in response generate graphic images to be projected onto said touch sensitive display screen at said locations,c) a computer for executing one or more applications programs in a multi-tasking environment and in response generating screen video displays, said computer being connected to said touch-sensitive display screen,d) a driver in said computer for receiving said control signals and in response generating a command to a selected one of said applications programs for updating said screen video displays in accordance with said applied pressure to said touch-sensitive display screen,e) a projector connected to said one or more computers for receiving and projecting said screen video displays onto said display screen, andf) structure for modifying location data in said command to thereby align said screen video displays with the location of said pressure applied to said display screen, wherein said command includes data for identifying horizontal and vertical coordinates of the location of said pressure applied to said display screen, and wherein said structure for modifying comprises a software routine for generating via said projector a plurality of alignment images onto said display screen at predetermined locations, detecting user applied pressure on said display screen at the respective locations of said images, and in response calibrating said horizontal and vertical coordinates to compensate for keystoning caused by planar misalignment between said projector and said display screen.
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Abstract
An interactive display system comprising a touch sensitive display surface for sensing pressure applied thereto and in response generating control signals indicating locations of the applied pressure, a personal computer for receiving the control signals and in response generating graphic images, and an LCD panel in combination with an overhead projector for receiving and projecting the graphic images onto the touch sensitive display surface at the indicated locations. The LCD panel and overhead projector may be provided an integral unit.
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Citations
29 Claims
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1. An interactive display system, comprising:
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a) a touch-sensitive display screen for sensing pressure applied thereto and in response generating control signals indicating locations of said applied pressure, b) structure configured to receive said control signals and in response generate graphic images to be projected onto said touch sensitive display screen at said locations, c) a computer for executing one or more applications programs in a multi-tasking environment and in response generating screen video displays, said computer being connected to said touch-sensitive display screen, d) a driver in said computer for receiving said control signals and in response generating a command to a selected one of said applications programs for updating said screen video displays in accordance with said applied pressure to said touch-sensitive display screen, e) a projector connected to said one or more computers for receiving and projecting said screen video displays onto said display screen, and f) structure for modifying location data in said command to thereby align said screen video displays with the location of said pressure applied to said display screen, wherein said command includes data for identifying horizontal and vertical coordinates of the location of said pressure applied to said display screen, and wherein said structure for modifying comprises a software routine for generating via said projector a plurality of alignment images onto said display screen at predetermined locations, detecting user applied pressure on said display screen at the respective locations of said images, and in response calibrating said horizontal and vertical coordinates to compensate for keystoning caused by planar misalignment between said projector and said display screen.
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2. An interactive display system, comprising:
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a) a touch-sensitive display screen for detecting pressure applied thereto and in response generating control signals indicating locations of the applied pressure, b) a computer for executing one or more application programs in a multi-tasking environment and in response generating screen video displays, said computer being coupled to said touch-sensitive display screen, c) a driver in said computer, for receiving said control signals from said touch sensitive display screen and in response generating a command to a selected one of said application programs updating said screen video displays in accordance with the pressure applied to said touch-sensitive display screen, d) a projector coupled to said computer for receiving and projecting said screen video displays onto said touch-sensitive display screen, and e) alignment structure, in said computer, to adjust location data in said command to thereby align said screen video displays with the location of said pressure applied to said touch-sensitive display screen, wherein the command includes data for identifying coordinates of the location of the pressure applied to said touch-sensitive display screen, and wherein said alignment structure includes a software routine for (i) projecting via said projector a plurality of predetermined images onto said touch-sensitive display screen, (ii) detecting user applied pressure at the respective locations of said predetermined images, and (iii) in response calibrating said coordinates to compensate for keystoning caused by planar misalignment between said projector and said touch-sensitive display screen.
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3. An interactive display apparatus, comprising:
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a touch-sensitive display screen providing a display surface for projection of a display image thereon and capable of generating, in response to pressure applied to the display surface, a location indication representing the location on the display surface where the pressure is applied; and an alignment routine configured to; (1) cause at least four alignment marks to be displayed via the display image; (2) receive for each one of the alignment marks a respective location indication representing a location on the display surface where pressure is applied to the display surface proximate that alignment mark; (3) use the respective location indications corresponding to the at least four alignment marks to generate a mapping between locations on the display surface and locations within the display image, wherein the mapping compensates for keystoning of the display image caused by non-orthogonal projection of the display image onto the display surface; and (4) use the mapping to correct coordinates of a subsequently-received location indication to a location within the display image where the subsequently-received location indication would be if the projected display image were rectangular. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of interacting with a touch-sensitive display screen, the touch-sensitive display screen providing a display surface for projection of a display image thereon, the method comprising the steps of:
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(a) generating, in response to pressure applied to the display surface, a location indication representing the location on the display surface where the pressure is applied; (b) causing at least four alignment marks to be displayed via the display image; (c) receiving for each one of the alignment marks a respective location indication representing a location on the display surface where pressure is applied to the display surface proximate that alignment mark; (d) generating a mapping between locations on the display surface and locations within the display image, using the respective location indications corresponding to the at least four alignment marks, wherein the mapping compensates for keystoning of the display image caused by non-orthogonal projection of the display image onto the display surface; and (e) using the mapping to correct coordinates of a subsequently-received location indication to a location within the display image where the subsequently-received location indication would be if the projected display image were rectangular. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. An interactive display system, comprising:
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a display screen, wherein the display screen provides a display surface for projection of a display image thereon, and wherein the display screen is capable of sensing pressure applied to the display surface, and, in response, generating a location indication representing the location on the display surface where the pressure is applied; and a computer-readable medium containing a computer program for performing an alignment routine, wherein the computer program performs the steps of; (a) causing at least four alignment marks to be displayed via the display image; (b) receiving for each one of the alignment marks a respective location indication representing a location on the display surface where pressure is applied to the display surface proximate that alignment mark; (c) generating a mapping between locations on the display surface and locations within the display image, using the respective location indications corresponding to the at least four alignment marks, wherein the mapping compensates for keystoning of the display image caused by non-orthogonal projection of the display image onto the display surface; and (d) using the mapping to correct coordinates of a subsequently-received location indication to a location within the display image where the subsequently-received location indication would be if the projected display image were rectangular.
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Specification