Process for controlling a matrix access display device
First Claim
1. In a process for controlling a display device comprising an active material layer reacting to a combined thermal and electric effect, the device comprising a first and second electrode networks, these networks being crossed so as to provide matrix addressing of the device, the electrodes of the first layer allowing zones of said layer to be heated successively, electric control fields being applied to said zones during cooling thereof for a predetermined time by electrodes surrounding said layer, said electric fields being generated from DC control voltages called video voltages, wherein, in order to remove any DC component from the electric fields applied to said layer, the electrodes applying said fields are brought to potentials such that said electric control fields are alternately directed in one direction then in the opposite direction.
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Abstract
The invention relates to controlling a matrix access display device comprising a layer of material reacting to a combined thermal and electric effect. According to the invention, the DC video control voltage is transformed into an AC voltage by switching the potentials of the electrodes applying the electric control field.
13 Citations
7 Claims
- 1. In a process for controlling a display device comprising an active material layer reacting to a combined thermal and electric effect, the device comprising a first and second electrode networks, these networks being crossed so as to provide matrix addressing of the device, the electrodes of the first layer allowing zones of said layer to be heated successively, electric control fields being applied to said zones during cooling thereof for a predetermined time by electrodes surrounding said layer, said electric fields being generated from DC control voltages called video voltages, wherein, in order to remove any DC component from the electric fields applied to said layer, the electrodes applying said fields are brought to potentials such that said electric control fields are alternately directed in one direction then in the opposite direction.
Specification