Bit-plane pulse width modulated digital display system
First Claim
Patent Images
1. A digital-drive display system, comprising:
- a display substrate having a display substrate area;
an array of display pixels disposed on the display substrate in the display substrate area;
a display controller that provides a timing signal to every display pixel in the array of display pixels, wherein each display pixel comprises;
a light emitter; and
a pixel controller comprising a digital memory for storing a multi-digit digital pixel value, and a drive circuit that drives the light emitter to emit light in response to the digital pixel value and to the timing signal, wherein the drive circuit provides a constant current independent of the stored multi-digit digital pixel value that is supplied to the light emitter for a time period defined by the timing signal and corresponding to the value of the stored multi-digit digital pixel value, wherein the time period is the sum of each period for which the drive circuit drives the light emitter to emit light in response to the digital pixel value.
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Abstract
A digital-drive display system, comprising an array of display pixels, each display pixel having a light emitter, a digital memory for storing a digital pixel value, and a drive circuit that drives the light emitter in response to the digital pixel value. The drive circuit can respond to a control signal provided to all of the display pixels in common by a display controller that loads digital pixel values in the digit memory of each display pixel.
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Citations
22 Claims
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1. A digital-drive display system, comprising:
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a display substrate having a display substrate area; an array of display pixels disposed on the display substrate in the display substrate area; a display controller that provides a timing signal to every display pixel in the array of display pixels, wherein each display pixel comprises; a light emitter; and a pixel controller comprising a digital memory for storing a multi-digit digital pixel value, and a drive circuit that drives the light emitter to emit light in response to the digital pixel value and to the timing signal, wherein the drive circuit provides a constant current independent of the stored multi-digit digital pixel value that is supplied to the light emitter for a time period defined by the timing signal and corresponding to the value of the stored multi-digit digital pixel value, wherein the time period is the sum of each period for which the drive circuit drives the light emitter to emit light in response to the digital pixel value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for controlling a digital display system, comprising:
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providing an array of display pixels disposed on a display substrate area of the display substrate, wherein each display pixel comprises; a light emitter, and a pixel controller comprising a digital memory for storing a multi-digit digital pixel value, and a drive circuit that drives the light emitter to emit light in response to the digital pixel value and to a timing signal, wherein the drive circuit provides a constant current independent of the stored multi-digit digital pixel value that is supplied to the light emitter for a time period defined by the timing signal and corresponding to the value of the stored multi-digit digital pixel value, wherein the time period is the sum of the periods for which the drive circuit drives the light emitter to emit light in response to the digital pixel value; providing a display controller for receiving an image having a digital pixel value for each image pixel in the image, each image pixel corresponding to a display pixel; and loading, via the display controller, the digital pixel values into the digital memory of the corresponding display pixel so that the drive circuit drives the light emitter to emit light in response to the digital pixel value stored in the digital memory.
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14. A method for controlling a digital display system, comprising:
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providing an array of display pixels disposed on a display substrate area of the display substrate and a display controller for controlling the display pixels, wherein each display pixel comprises; a light emitter, and a pixel controller comprising a digital memory for storing a multi-digit digital pixel value, and a drive circuit that drives the light emitter to emit light in response to the digital pixel value and to a timing signal, wherein the drive circuit provides a constant current independent of the stored multi-digit digital pixel value that is supplied to the light emitter for a time period defined by the timing signal and corresponding to the value of the stored multi-digit digital pixel value, wherein the time period is the sum of the periods for which the drive circuit drives the light emitter to emit light in response to the digital pixel value, wherein the display controller comprises; a loading circuit for loading at least one digit of the multi-digit digital pixel value in the digital memory of each display pixel and a control circuit for controlling a control signal connected to each display pixel in common; receiving, via the display controller, an image having a multi-digit digital pixel value for each image pixel in the image, each image pixel corresponding to a display pixel; and repeatedly loading, via the display controller, a different digit of each image pixel value into a corresponding display pixel until all of the digits in the image pixel value have been loaded and enabled. - View Dependent Claims (15, 16, 17, 18, 19)
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20. A digital-drive display system, comprising:
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a display substrate having a display substrate area; an array of display pixels disposed on the display substrate in the display substrate area; a display controller that provides a timing signal to every pixel in the array of display pixels, wherein each display pixel comprises; a light emitter, and a pixel controller comprising a digital memory for storing a multi-digit digital pixel value and a drive circuit that drives the light emitter to emit light in response to the digital pixel value and to a timing signal wherein the drive circuit provides a constant current independent of the stored multi-digit digital pixel value that is supplied to the light emitter for a time period defined by the timing signal and corresponding to the value of the stored multi-digit digital pixel value, wherein the time period is a bit period or a bit period times the place of a bit in the multi-digit digital pixel value, and wherein the multi-digit digital pixel value is a binary value. - View Dependent Claims (21, 22)
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Specification