Electroluminescent display devices
First Claim
1. A method of illuminating an active matrix electroluminescent display device comprising an array of display pixels arranged in rows and columns, the method comprising acts of:
- at any point in time;
forming at least two scrolling bands of a plurality of simultaneously illuminated rows o pixels;
forming a second scrolling band of a plural of non-illuminated rows of pixels for separating the at least two bands;
scrolling the at least two bands in the column direction over time such that they simultaneously change horizontal position from one time to a next time; and
displaying image data for different frames of video in different of the at least two bands so that different parts of two adjacent frames are displayed at any one time,wherein not more than 75% of the rows of pixels are illuminated at any point in time.
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Accused Products
Abstract
In an active matrix electroluminescent display, a plurality of rows of pixels are illuminated, defining at least two bands of rows separated by a non-illuminated band. The bands of rows of pixels scroll in the column direction over time, and at most 75% of the rows are illuminated at any point in time. This method is in essence a double bar scrolling method. By scrolling two bars, the required peak brightness is reduced as the effective overall duty cycle is increased. However, the period of illumination can still remain short, so that motion perception remains improved. The scrolling speed can be halved for the same frame rate or else the frame rate can be increased to reduce flicker.
25 Citations
11 Claims
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1. A method of illuminating an active matrix electroluminescent display device comprising an array of display pixels arranged in rows and columns, the method comprising acts of:
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at any point in time; forming at least two scrolling bands of a plurality of simultaneously illuminated rows o pixels; forming a second scrolling band of a plural of non-illuminated rows of pixels for separating the at least two bands; scrolling the at least two bands in the column direction over time such that they simultaneously change horizontal position from one time to a next time; and displaying image data for different frames of video in different of the at least two bands so that different parts of two adjacent frames are displayed at any one time, wherein not more than 75% of the rows of pixels are illuminated at any point in time. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An active matrix electroluminescent display device comprising:
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an array of display pixels arranged in rows and columns; and row driver circuitry for forming at least two scrolling bands of a plurality of simultaneously illuminated rows of pixels, forming a second scrolling band of a plurality of non-illuminated rows of pixels for separating the at least two bands, the row driver circuitry illuminating each row of pixels for not more than 75% of a frame period, wherein the at least two bands scroll in the column direction over time such that they simultaneously change horizontal position from one time to a next time, and image data for different frames of video is displayed in different ones of the at least two bands so that different parts of two adjacent frames are displayed at any one time. - View Dependent Claims (8, 9, 10, 11)
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Specification