Electron emission display (EED) device with variable expression range of gray level
First Claim
1. An Electron Emission Display (EED) device comprising:
- a scan driver;
a data driver;
an EED panel adapted to display a display data signal according to a scan signal of the scan driver, the display data signal obtained by modulating a pulse width of video data from the data driver;
a reference signal memory adapted to store a lookup table of active pulse widths of horizontal synchronization signals defined by a system clock and reference signals corresponding to the active pulse widths of the horizontal synchronization signals, the lookup table being arranged to store values to expand an expression range of gray levels beyond a predetermined number of grayscale levels;
a reference signal referring unit adapted to output a reference signal in accordance with the lookup table stored in the reference signal memory;
a gray level signal generator adapted to count the reference signal and output a gray level signal to the data driver; and
a synchronization signal counter adapted to examine the active pulse width of a horizontal synchronization signal;
wherein the data driver outputs the display data signal corresponding to the gray level signal and the video data to data electrode lines of the EED panel; and
wherein the synchronization signal counter is adapted to count the horizontal synchronization signal based on the system clock and to output an active pulse width value of the horizontal synchronization signal to the reference signal referring unit.
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Accused Products
Abstract
An Electron Emission Display (EED) device, adapted to of adjust a pulse width of data signal according to an active pulse width of a horizontal synchronization signal, includes: a scan driver, a data driver; an EED panel displaying display data; a reference signal memory adapted to store a lookup table of active pulse widths of horizontal synchronization signals defined by a system clock and reference signals corresponding to the active pulse widths of the horizontal synchronization signals; a reference signal referring unit adapted to output a reference signal in accordance with the lookup table stored in the reference signal memory; and a gray level signal generator adapted to count the reference signal and output a gray level signal to the data driver, the data driver outputting video data corresponding to the gray level signal to data electrode lines of the EED panel.
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Citations
14 Claims
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1. An Electron Emission Display (EED) device comprising:
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a scan driver; a data driver; an EED panel adapted to display a display data signal according to a scan signal of the scan driver, the display data signal obtained by modulating a pulse width of video data from the data driver; a reference signal memory adapted to store a lookup table of active pulse widths of horizontal synchronization signals defined by a system clock and reference signals corresponding to the active pulse widths of the horizontal synchronization signals, the lookup table being arranged to store values to expand an expression range of gray levels beyond a predetermined number of grayscale levels; a reference signal referring unit adapted to output a reference signal in accordance with the lookup table stored in the reference signal memory; a gray level signal generator adapted to count the reference signal and output a gray level signal to the data driver; and a synchronization signal counter adapted to examine the active pulse width of a horizontal synchronization signal; wherein the data driver outputs the display data signal corresponding to the gray level signal and the video data to data electrode lines of the EED panel; and wherein the synchronization signal counter is adapted to count the horizontal synchronization signal based on the system clock and to output an active pulse width value of the horizontal synchronization signal to the reference signal referring unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of driving an Electron Emission Display (EED) which displays a display data signal on an EED panel according to scan signal of a scan driver, the display data signal being obtained by modulating a pulse width of a video data at a data driver, the method comprising:
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creating a lookup table of active pulse widths of horizontal synchronization signals and reference signals corresponding to the active pulse widths of the horizontal synchronization signals based on a system clock, the lookup table being arranged to store values to expand an expression range of gray levels beyond a predetermined number of grayscale levels; examining an active pulse width of a horizontal synchronization signal; generating a reference signal in accordance with the lookup table stored in a reference signal memory according to the active pulse width of the horizontal synchronization signal; counting the reference signal to generate a gray level signal; and outputting the display data signal corresponding to a pulse width of the gray level signal and the video signal to data electrode lines of the EED panel; wherein examining of the active pulse width of the horizontal synchronization signal includes counting the horizontal synchronization signal, based on the system clock, to calculate an active pulse width value. - View Dependent Claims (13, 14)
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12. The method of 11, wherein creating of the lookup table comprises storing waveform data of reference signals corresponding to the active pulse widths of the horizontal synchronization signals in the lookup table according to the system clock.
Specification