Image display device and display device control method
First Claim
1. Active-matrix image display device, comprising:
- several light emitters forming an array of emitters distributed in rows and columns, each emitter being able to be addressed periodically by a value of a display signal, which value is representative of a datum of display of an image duration; and
a current modulator linked in series to each light emitter of the array so as to form emitter-modulator series, the said modulator comprising a source, a drain, a gate, the said modulator being able to be traversed by a drain current so as to power the said emitter, for a voltage between one out of the drain and source, and the gate greater than or equal to a trip threshold voltage of this modulator; and
a storage capacitor for electric charge, able to maintain a control voltage at the gate of each modulator for the said image duration; and
selection means able to select the emitters of one and the same row; and
means of driving the illumination of the emitters comprising, for each column, means for powering these emitters comprising an output connected to one of the ends of each emitter-modulator series of the said column and at least one operational amplifier for controlling the corresponding modulators having an inverting input, a non-inverting, and an output, the said output of the amplifier being able to be connected to the gate of each modulator of this column when an emitter linked to this modulator is selected, so as to apply to the said gate, the said control voltage;
wherein one out of the non-inverting input and the inverting input of the operational amplifier is connected to the said output of the powering means so as to form, with the gate of the modulator, linked to the output of the operational amplifier, a loop for feedback of the operational amplifier, when one of the said emitters is selected.
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Abstract
The invention relates to an active matrix image display device consisting of: several light emitters; a current modulator which is connected to each emitter; means for selecting emitters; means for powering the emitters; and an operational amplifier comprising an inverting input a noninverting input and an output. According to the invention, either the noninverting input or the inverting input of the operational amplifier is connected to the output of the power supply means such as to form, together with the modulator gate which is connected to the output of the operational amplifier, a feedback loop for the operational amplifier, when one of the emitters is selected. The invention also relates to a method of controlling one such display device.
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Citations
16 Claims
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1. Active-matrix image display device, comprising:
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several light emitters forming an array of emitters distributed in rows and columns, each emitter being able to be addressed periodically by a value of a display signal, which value is representative of a datum of display of an image duration; and a current modulator linked in series to each light emitter of the array so as to form emitter-modulator series, the said modulator comprising a source, a drain, a gate, the said modulator being able to be traversed by a drain current so as to power the said emitter, for a voltage between one out of the drain and source, and the gate greater than or equal to a trip threshold voltage of this modulator; and a storage capacitor for electric charge, able to maintain a control voltage at the gate of each modulator for the said image duration; and selection means able to select the emitters of one and the same row; and means of driving the illumination of the emitters comprising, for each column, means for powering these emitters comprising an output connected to one of the ends of each emitter-modulator series of the said column and at least one operational amplifier for controlling the corresponding modulators having an inverting input, a non-inverting, and an output, the said output of the amplifier being able to be connected to the gate of each modulator of this column when an emitter linked to this modulator is selected, so as to apply to the said gate, the said control voltage; wherein one out of the non-inverting input and the inverting input of the operational amplifier is connected to the said output of the powering means so as to form, with the gate of the modulator, linked to the output of the operational amplifier, a loop for feedback of the operational amplifier, when one of the said emitters is selected. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. Method of control for active-matrix image display device comprising several light emitters forming an array of emitters distributed in rows and columns, each emitter being able to be addressed periodically by a value of a display signal, which value is representative of a datum of display for an image duration;
- a current modulator comprising a source, a drain, a gate, one out of the drain or the source of each modulator being linked in series to an emitter of the array so as to form an emitter-modulator comprising two ends;
selection means able to select the emitters of a row;
a storage capacitor for electric charge, able to maintain a control voltage at the gate of the or each modulator for the said image duration;
means of driving the illumination of the emitters of a column comprising at least one operational amplifier having an inverting input, a non-inverting input and an output, the method comprising the following stepstransmission by the means of selection, of a selection signal to a row of emitters; and application by the drive means of a drive signal to one of the ends of each emitter-modulator series of a column; application by the drive means of a control signal to the gate of each modulator, linked to the selected emitter, wherein it furthermore comprises the following step; selection of a row of emitters so as to form a loop for feedback of the operational amplifier with the gate of the modulator, linked to the output of the operational amplifier, and with one out of the non-inverting input and the inverting input of the operational amplifier, linked to the said output of the means of powering of these emitters. - View Dependent Claims (16)
- a current modulator comprising a source, a drain, a gate, one out of the drain or the source of each modulator being linked in series to an emitter of the array so as to form an emitter-modulator comprising two ends;
Specification