DC integrating display driver employing pixel status memories
DCFirst Claim
1. A system for displaying a demanded image in an array of pixels, wherein said array of pixels is driven to produce said demanded image, wherein said pixels operate within a range of controllable driven gray levels, the gray level displayed by each of said pixels responsive to electric fields applied to each of said pixels;
- said system comprising;
memory means for storing electro-optic conditions of pixels in said array;
driver means for applying drive signals to selective pixels; and
means for controlling the level of said drive signals applied to a pixel responsive to the demanded image and to the stored electro-optic condition existing on said pixel.
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Abstract
This invention relates to an improved drive and control means for matrix addressable electro-optic displays, such as passive matrix LCDs and active matrix LCDs. The present invention achieves improved drive and control of displays through the use of real time computation and memory circuits to simulate the electro-optic condition and the accumulated DC bias of individual display elements. This eliminates the burden of frequent and symmetrical reversals of the drive polarity, and allows the implementation of flexible DC drive methodologies.
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Citations
69 Claims
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1. A system for displaying a demanded image in an array of pixels, wherein said array of pixels is driven to produce said demanded image, wherein said pixels operate within a range of controllable driven gray levels, the gray level displayed by each of said pixels responsive to electric fields applied to each of said pixels;
- said system comprising;
memory means for storing electro-optic conditions of pixels in said array; driver means for applying drive signals to selective pixels; and means for controlling the level of said drive signals applied to a pixel responsive to the demanded image and to the stored electro-optic condition existing on said pixel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
- said system comprising;
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40. A driver system to drive a plurality of liquid crystal display pixels which produce a demanded display image, said driver system comprising:
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means for storing a representation of the existing electro-optic condition of a plurality of liquid crystal display pixels; means for comparing said demanded display image and said representation of the existing electro-optic condition of individual pixels of said plurality of pixels and for producing drive signals, the level of said drive signal being dependent on the difference between said demanded display image and said representation of the existing electro-optic condition of each pixel; and means for receiving and applying said drive signals to drive said pixels to produce said demanded display image in a sequence responsive to the representation of the electro-optic conditions of individual pixels of said plurality of pixels. - View Dependent Claims (41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55)
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56. A system for producing a demanded image on a plurality of pixels, wherein said pixels can produce desired gray levels, said system comprising:
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simulation means for simulating the existing electro-optic condition of said pixels; and means responsive to said simulation of the existing electro-optic condition of said pixels and to a demanded image for producing drive signals for said pixels to produce said demanded image. - View Dependent Claims (57, 58, 59, 60)
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61. A drive and control apparatus for matrix addressable electro-optic displays formed of a plurality of individual pixels, said drive and control apparatus comprising:
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memory means for simulating the existing electro-optic condition on said pixels on a pixel by pixel basis; demanded image means for producing pixel by pixel demanded electro-optic conditions; and real time control means for driving each of said pixels by a drive signal level related to the specific simulated and demanded electro-optic conditions on said pixel. - View Dependent Claims (62)
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63. A drive system for matrix addressable electro-optic displays formed of a plurality of pixels, said pixels being driven to product display contrast, the display contrast being expressable in gray levels, said drive system comprising:
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means for applying DC power in the form of plurality of pulses to said pixels to produce the desired display contrast level; and means for selecting the value of said DC power level at any level between its minimum and maximum applied values by selecting the order and sequence of said pulses applied to said pixels. - View Dependent Claims (64, 65, 66, 67)
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68. A drive system for a matrix addressable electro-optic display formed of a plurality of pixels for producing a display image, wherein said image is produced during successive display periods, said pixels capable of being driven in either of two polarity directions to produce a desired display image, said drive system comprising:
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memory means for storing the existing DC bias level on said pixels in the form of a representation of the accumulated DC bias levels on said pixels during successive display periods and for producing a drive signal having the same polarity as that of the existing bias level; and means for receiving said drive signal and driving said pixels in one polarity for a plurality of successive display periods. - View Dependent Claims (69)
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Specification