Electroluminescent panel driving system for driving the panel's electrodes only when non-blank data is present to conserve power
First Claim
1. An electroluminescent panel display system comprising:
- electroluminescent panel means, for displaying information, having a plurality of display lines;
display drive means, operatively connected to said electroluminescent panel means, for producing image data for each display line, said image data for each display line represented by a group of signals, each signal being either a first level or a second level, said first level representing a spot of intended illumination on said electroluminescent panel means, said second level representing a spot of intended non-illumination on said electroluminescent panel means;
said display means providing drive signals, producing at a first instant in time a first voltage in accordance with said drive signals and producing at a second instant in time a second voltage in accordance with said drive signals, said first voltage preparing said electroluminescent panel means to illuminate, said second voltage causing a spot of illumination on said electroluminescent panel means; and
display control means, operatively connected to said display drive means to receive said image data and said drive signals, for detecting when at least one first level is present in said image data;
said display control means permitting the production of said first and said second voltage by said display drive means when at least one first level is present in said image data and preventing the production of said first voltage and said second voltage by said display drive means when at least one first level is not detected in said image data, said display control means thereby preventing power loss when an individual display line contains no intended spots of illumination.
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Accused Products
Abstract
An EL (electroluminescent) panel driving system includes a display control circuit for producing, line by line, an image data. The image data of each line is defined by a combination of a HIGH level signal representing a spot illumination of the EL panel and a LOW level signal representing a non-illumination of a spot on the EL panel. The system further includes a pre-charge circuit and a pull-up charge circuit for providing a first range voltage to the EL panel at the beginning of each line scan operation to make the EL panel ready to illuminate, and a write-in circuit and a source level switching circuit for providing a second range voltage to the EL panel to permit the spot illumination of the EL panel in accordance with the HIGH level signals contained in the image data. These four circuits are turned on by four signals. The driving system also includes a detector that detects when no HIGH level signal are present in the image data of a line, an AND gate array for cutting off the four signals from the pre-charge circuit, pull-up circuit, write-in circuit, and source circuit, the four circuits are prevented from being actuated, thereby cutting off the power normally supplied during the blank line scanning to save power.
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Citations
14 Claims
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1. An electroluminescent panel display system comprising:
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electroluminescent panel means, for displaying information, having a plurality of display lines; display drive means, operatively connected to said electroluminescent panel means, for producing image data for each display line, said image data for each display line represented by a group of signals, each signal being either a first level or a second level, said first level representing a spot of intended illumination on said electroluminescent panel means, said second level representing a spot of intended non-illumination on said electroluminescent panel means; said display means providing drive signals, producing at a first instant in time a first voltage in accordance with said drive signals and producing at a second instant in time a second voltage in accordance with said drive signals, said first voltage preparing said electroluminescent panel means to illuminate, said second voltage causing a spot of illumination on said electroluminescent panel means; and display control means, operatively connected to said display drive means to receive said image data and said drive signals, for detecting when at least one first level is present in said image data;
said display control means permitting the production of said first and said second voltage by said display drive means when at least one first level is present in said image data and preventing the production of said first voltage and said second voltage by said display drive means when at least one first level is not detected in said image data, said display control means thereby preventing power loss when an individual display line contains no intended spots of illumination. - View Dependent Claims (2, 3, 4)
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5. An electroluminescent panel display system comprising:
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electroluminescent panel means, for displaying information having a plurality of display lines, said display lines being scan lines and data lines; display control means, for producing image data for each display line, for detecting the contents of said image data, and for providing drive signals, said image data for each display line represented by a group of signals, each signal being either a first level or a second level, said first level representing a spot of intended illumination on said electroluminescent panel means, said second level representing a spot of intended non-illumination on said electroluminescent panel means, said drive signals being provided only when at least one first level is present in said image data; and circuit means, operatively connected to said electroluminescent panel means and said display control means and responsive to said drive signals and said image data, for producing at a first instant in time a first voltage in accordance with said image data only when said drive signals are provided and for producing at a second instant in time a second voltage in accordance with said image data only when said drive signals are provided, said first voltage preparing said electroluminescent panel means to illuminate, said second voltage causing a spot of illumination on said electroluminescent panel means; said circuit means including, first scan means, operatively connected to said electroluminescent panel means and responsive to said drive signals, for sequentially providing said first voltage to each scan line of said electroluminescent panel means, and second scan means, operatively connected to said electroluminescent panel means and said display control means and responsive to said drive signals and said image data, for providing said second voltage to each scan line of said electroluminescent panel means in response to said first levels; said display control means including, first switch means, responsive to said image data, for detecting when at least one first level is present, for producing a present signal when at least one first level is present in said image data, and for producing an absent signal when at least one first level is not present in said image data, and second switch means, operatively connected to said circuit means and responsive to said present signal and said absent signal, for regulating transmission of said drive signals to said first and second scan means, said second switch means allowing transmission of said drive signals to said first and second scan means in response to said present signal and for preventing transmission of said drive signals to said first and second scan means in response to said absent signal, thereby preventing the functions of said first and second scan means when no first level is detected in said image data.
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6. An electroluminescent panel system for displaying information comprising:
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an electroluminescent panel having plurality of display lines; display control means for producing control signals and image data for each display line, said image data for each said display line formed of a group of signals, each signal being either the first level or a second level, said first level representing a spot of intended illumination on said electroluminescent panel, said second level representing a spot of intended non-illumination on said electroluminescent panel; drive means, operatively connected to said electroluminescent panel and said display control means to receive said image data and responsive to said display control means, for sequentially providing at a first instant in time a first voltage to certain display lines of said electroluminescent panel and for providing a second voltage at a second instant in time to certain display lines of said electroluminescent panel in response to said first level, said first voltage preparing said electroluminescent panel to illuminate, said second voltage selectively causing a spot of a illumination on said electroluminescent panel, said control signals determining when said first voltage and said second voltage are provided to said electroluminescent panel; and control means, operatively connected to said display control means and said drive means, for detecting at least one first level in said image data; said control means permitting said control signals to be provided to said drive circuit means when at least one first level is detected and not permitting said control signals to be provided to said drive means when no first levels are detected, thereby preventing the function of said drive means when no first levels are present. - View Dependent Claims (7, 8, 9)
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10. An electroluminescent panel driving system for driving electroluminescent panel having a plurality of scan lines and data lines comprising:
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image data producing means, for sequentially producing image data for each scan line, said image data for each scan line formed of a group of bits, each bit having either a first level or a second level, said first level representing a spot of intended illumination on the electroluminescent panel, said second level representing a spot of intended non-illumination on the electroluminescent panel; first scan means, operatively connected to the electroluminescent panel, for sequentially providing a first voltage to each scan line of the electroluminescent panel, said first voltage preparing the electroluminescent panel to illuminate; second scan means, operatively connected to said image data producing means and the electroluminescent panel, for providing a second voltage to each scan line of the electroluminescent panel in response to said first level, said second voltage selectively causing a spot of illumination on the electroluminescent panel; detecting means, operatively connected to said image data producing means, for detecting the presence of at least one first level in said image data; said detecting means producing a present signal when at least one first level is present and producing an absent signal when at least one first level is not present in said image data; and control means, operatively connected to the said first and second scan means and responsive to said present and absent signals of said detecting means, for enabling said first and second scan means when said present signal is received and disabling said first and second scan means when said absent signal is received.
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11. An electroluminescent matrix display drive system for supplying drive voltages to elements of an electroluminescent matrix display, the elements being arranged in scan lines, comprising:
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a power supply; display control means, for developing image data representative of an image to be displayed on the display, said image data selectively representing the intended illumination or lack of intended illumination of each element on the display; display drive means, powered by said power supply, for supplying a net drive voltage across each element to selectively cause the element to illuminate in response to said image data developed by said display control means; and power conservation means, responsive to said image data, for disconnecting said power supply from said display drive means when the image data for an entire scan line is representative only of the lack of illumination of each scan line element, thereby to substantially reduce power consumption of said drive system. - View Dependent Claims (12, 13, 14)
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Specification