Projection apparatus and method of image projection
First Claim
1. A projection apparatus for generating an image by projecting light representative of said image on to a display screen, said apparatus comprising at least one projector operable to receive a component signal representative of a component of said image and to project light representative of the component on to said display screen, said projector having an adjustment means for adjusting the relative position of the projected image component on the display screen in accordance with an adjustment signal, a convergence processor coupled to said adjustment means and operable to adjust a relative position of said image component on said display screen in response to α
- measurement signal generated by a sensing device in response to a test projection received from said sensing device, wherein said sensing device is operable to produce a measurement signal having a predetermined output value when said relative position of said test projection is substantially optimum, and said convergence processor is operable to displace successively said test projection from a first position, until said value of said measurement signal corresponds to said predetermined output value, said adjustment signal being set in correspondence with said relative displacement of said test projection from said first position to the position at which said measurement signal corresponds to said predetermined output value.
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Accused Products
Abstract
A projection apparatus generates an image (1) by projecting light representative of the image (1) on to a display screen (10). The apparatus (5) comprises at least one projector (20, 22, 24) operable to receive a component signal (IR, IB, IG) representative of a component of the image and to project light representative of the component on to the display screen (10), the projector having an adjustment means for adjusting the relative position of the projected image component on the display (10) screen in accordance with an adjustment signal, a convergence processor (120) coupled to the adjustment means and operable to adjust a relative position of the image component on the display screen in response to α measurement signal generated by a sensing device (SD, SD′) disposed with respect to the screen (10) in response to a test projection (150, 160, 220, 230, 240, 250, 260) received from the sensing device (SD, SD′), wherein the sensing device is operable to produce a measurement signal having a predetermined output value when the relative position of the test projection is substantially optimum, and the convergence processor (120) is operable to displace successively the test projection from a first position, by a predetermined amount, until the value of the measurement signal corresponds to the predetermined output value, the adjustment signal being set in correspondence with the relative displacement of the test projection (150, 160, 220, 230, 240, 250, 260) from the first position to the position at which the measurement signal corresponds to the predetermined output value. The predetermined value may be a null value, zero or substantially close to zero. The convergence processor may be implemented in hardware because the detection of the null value facilitates detection of the optimum alignment position, in accordance with a simplified alignment process.
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Citations
18 Claims
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1. A projection apparatus for generating an image by projecting light representative of said image on to a display screen, said apparatus comprising
at least one projector operable to receive a component signal representative of a component of said image and to project light representative of the component on to said display screen, said projector having an adjustment means for adjusting the relative position of the projected image component on the display screen in accordance with an adjustment signal, a convergence processor coupled to said adjustment means and operable to adjust a relative position of said image component on said display screen in response to α - measurement signal generated by a sensing device in response to a test projection received from said sensing device, wherein
said sensing device is operable to produce a measurement signal having a predetermined output value when said relative position of said test projection is substantially optimum, and said convergence processor is operable to displace successively said test projection from a first position, until said value of said measurement signal corresponds to said predetermined output value, said adjustment signal being set in correspondence with said relative displacement of said test projection from said first position to the position at which said measurement signal corresponds to said predetermined output value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
- measurement signal generated by a sensing device in response to a test projection received from said sensing device, wherein
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16. A method of projecting an image having at least one component onto a display screen, said image component being represented as an image component signal, said method comprising the steps of
projecting a test projection on to the screen, sensing a relative position of the test projection, using a sensing device which is operable to produce a measurement signal having a predetermined output value when said relative position of said test projection is aligned at a substantially optimum position, displacing successively said test projection from a first position, detecting when said value of said measurement signal corresponds to said predetermined output value, and setting said adjustment signal in correspondence with said relative displacement of said test projection from said first position to the position at which said measurement signal is equal to said predetermined output value.
Specification