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, at any point in time, illuminating a plurality of rows of pixels, the plurality of rows defining at least two bands (10) of rows separated by a non-illuminated band (12), the at least two bands (10) of rows of pixels scrolling in the column direction over time, and wherein at most 75% of the rows are illuminated at any point in time.
4 Assignments
0 Petitions
Accused Products
Abstract
In an active matrix electroluminescent display, a plurality of rows of pixels are illuminated, defining at least two bands (10) of rows separated by a non-illuminated band (12). The bands (10) 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.
-
Citations
12 Claims
- 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, at any point in time, illuminating a plurality of rows of pixels, the plurality of rows defining at least two bands (10) of rows separated by a non-illuminated band (12), the at least two bands (10) of rows of pixels scrolling in the column direction over time, and wherein at most 75% of the rows are illuminated at any point in time.
- 8. An active matrix electroluminescent display device comprising an array of display pixels (1) arranged in rows and columns, and row driver circuitry (8) for illuminating a plurality of rows of pixels simultaneously, the plurality of rows defining at least two bands (10) of rows separated by non-illuminated bands (12), wherein the row driver circuitry comprises means for illuminating each row for at most 75% of the frame period, such that the illuminated rows define at least two bands (10) of rows of pixels which scroll in the column direction over time.
Specification