Matrix display with matched solid-state pixels
First Claim
Patent Images
1. A display system comprising a matrix of display pixels each comprising solid-state lamp means having different properties individual to the corresponding pixel, said display system comprising:
- storage means permanently storing for each of said lamp means individually physical information derived by measurement of at least one of the current of the lamp means and light generated by the lamp means;
a plurality of transistors each operable to drive a corresponding one of the lamp means in a row of said matrix;
a plurality of single-bit memory elements each of which controls an associated one of said plurality of transistors;
a microprocessor for outputting for each of said memory elements a serial data stream that is loaded into the memory element, the serial data stream being dependent on the physical information of a lamp means that is driven under control of the memory element; and
means for reducing differences in the appearances of said matrix pixels that are due to differences in the properties of the corresponding lamp means.
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Abstract
A display matrix having LED lamps is arranged so that brightness variations between the lamps, due to the lamps having different characteristics from each other, is reduced. A process for setting up the display using an electronic camera is described. The system is arranged so that the brilliance of the lamps is automatically maximised when the sun is shining on the face of the display.
98 Citations
20 Claims
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1. A display system comprising a matrix of display pixels each comprising solid-state lamp means having different properties individual to the corresponding pixel, said display system comprising:
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storage means permanently storing for each of said lamp means individually physical information derived by measurement of at least one of the current of the lamp means and light generated by the lamp means; a plurality of transistors each operable to drive a corresponding one of the lamp means in a row of said matrix; a plurality of single-bit memory elements each of which controls an associated one of said plurality of transistors; a microprocessor for outputting for each of said memory elements a serial data stream that is loaded into the memory element, the serial data stream being dependent on the physical information of a lamp means that is driven under control of the memory element; and means for reducing differences in the appearances of said matrix pixels that are due to differences in the properties of the corresponding lamp means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A display system comprising a matrix of display pixels each comprising solid-state lamp means having a degradation rate individual to the corresponding pixel, said display system comprising:
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storage means permanently storing for each of said lamp means individual physical information derived by measurement of at least one of the current of the lamp means and light generated by the lamp means; a plurality of transistors each operable to deliver a rectangular pulse of current to a corresponding one of the lamp means in a row of said matrix; a plurality of single-bit memory elements each of which controls an associated one of said transistors; control means for preparing for each of said memory elements a serial data stream that is loaded into the memory element, the serial data stream being dependent on the physical information of a lamp means that is driven under control of the memory element; and means for repriming the display system for reducing differences in the appearances of said matrix pixels that are due to differences in the degradation rates of corresponding lamp means. - View Dependent Claims (14, 15)
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16. A display system, comprising:
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a matrix of display pixels each comprising solid state lamp means individual to the pixel, the brilliance of each of said lamp means being individually adjustable; means for permanently storing physical information for each of said lamp means individually and permanently installed means common to all of said lamp means for measuring light from each of said lamp means; means for switching the display system occasionally into a priming mode in which the physical information is automatically re-established using said common measuring means; and means for reducing differences in the appearances of said matrix pixels during display that are due to differences in the properties of their respective lamp means.
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17. A display system comprising a matrix of display pixels each comprising solid-state lamp means individual to the pixel, said display system, comprising:
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means permanently storing physical information for each of said lamp means individually, derived by measurement of light generated by the lamp means; a plurality of transistors each operable to deliver current to a corresponding one of the lamp means in a row of said matrix; a plurality of single-bit memory elements each of which controls an associated one of said transistors; control means for preparing for each of said memory elements a serial data stream that is loaded into the memory element, the serial data stream being dependent on the physical information of said lamp means that is driven under control of the memory element; a camera positioned for taking at least one picture of said matrix the output of which determines said permanently-held physical information for each of said lamp means; and means for reducing differences in the appearances of said matrix pixels that are due to differences in the properties of the respective associated lamp means caused by degradation of the lamp means.
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18. A display system comprising a matrix of display pixels each comprising solid-state lamp means individual to the pixel, said display system comprising:
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means for permanently storing physical information for each of said lamp means individually; a camera pointed at said matrix for capturing a picture of the respective pixels thereof, said physical information being dependent on output from said camera; and means for reducing differences in the appearances of said matrix pixels that are due to differences in the properties of their respective lamp means. - View Dependent Claims (19)
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20. A display system comprising a matrix of display pixels each comprising solid-state lamp means each having a corresponding degradation rate individual to the pixel, each lamp means being turned on in response to command information (P) defining the brightness required of the lamp means, said display system comprising:
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storage means permanently storing for each of said lamp means individual physical information derived by measurement of at least one of the current of the lamp means and light generated by the lamp means; a plurality of transistors each operably to deliver a rectangular pulse of current to a corresponding one of the lamp means in a row of said matrix; a plurality of single-bit memory elements each of which controls an associated one of said of transistors; control means for preparing for each of said memory elements a serial data stream that is loaded into the memory element, the serial data stream being dependent on a function of the physical information of a lamp means that is driven under control of the memory element and the command information for that lamp means; and means for repriming said display system so as to reduce differences in the appearances of said matrix pixels that are due to differences in the degradation rates of the corresponding lamp means.
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Specification