Image display screen and method for controlling said screen

Abstract

The invention relates to an image display screen consisting of light transmitters (4, 6, 8) distributed according to the transmitter lines and transmitter columns and transmitter emission control means (2, 10, 20, 30, 40, 42, 44, 46, 48, 50) which comprises a plurality of modulating transistors (14, 24, 34) each of which is associated with a network transmitter, said modulating transistors being positioned in such a way that they are adjacent to each other along a guiding line, a plurality of compensating transistors (48) for compensating the threshold triggering voltage of the modulating transistors. A single compensating transistor (48) is connected to the totality of modulating transistors (14, 24, 34) of a column for compensating the threshold triggering voltage of the totality of said modulating transistors (14, 24, 34) of the column. Said compensating transistor (48) is formed on the extension of said modulating transistors (14, 24, 34) of the column along the same guiding line. A method for controlling the inventive screen is also disclosed.

Description

technical field [0001] The present invention relates to display screens. [0002] In particular, the invention relates to active matrix display screens based on electroluminescent organic material types with thin film transistors. Background technique [0003] These transistors are produced by crystallization of a polycrystalline silicon substrate obtained by the technique of heating an amorphous silicon substrate with a pulsed excimer laser. This technique for making thin-film transistors is very economical. [0004] However, crystallization of amorphous silicon results in the formation of single crystal silicon grains of different orientations separated by grain boundaries. These grain boundaries introduce dispersion in the threshold trigger voltage of transistors, and non-uniformity in the level of current flowing through them for a given voltage applied to their gates. Now, because the screen's light emitters produce light proportional to the current flowing through t...

AI Technical Summary

Problems solved by technology

[0007] However, for this type of screen, an initialization transistor and a selection transistor also need to be fabricated, resulting in a total of four transistors controlling the lighting of each emitter of the screen

These transistors now significantly reduce the pixel's useful light-emitting surface area

Also, it is not an economical process to manufacture a large number of transistors

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