Sextant Avionique

Thales

Pierre Fagard

Philippe Coni

Jean-Marc Coppin

Xavier Caugant

Claude Nigen

The invention pertains to a display device, the surface of the device being rendered touch-sensitive, the device comprising a first dedicated part comprising two insulating plates, a layer of material exhibiting electro-optical properties suitable for rendering all or part of its surface visible under the effect of an electrical control signal, the layer being disposed between the two plates, at least one first electrode having the shape of a pictogram, the first electrode being disposed on a face of one of the insulating plates, a second electrode disposed on a face of the other insulating plate opposite at least one first electrode. According to the invention, the second electrode is used as responsive element of the touch-sensitive surface of the device, the surface area of the second electrode is at least 9 mm, and the surface area of the second electrode is greater than the surface area or the sum of the surface areas of the first electrode or electrodes opposite.

Display device dedicated to proximity detection

The invention pertains to a display device comprising means of detection of proximity and to a method of using this device. The device comprises a liquid crystal layer, at least two electrodes making it possible to excite the liquid crystal, means for generating a control signal for the electrodes, means for generating a high frequency signal applied to the second electrode, means for detecting a modification, if any, of the high frequency signal. The device also comprises means of mixing (Rscb) of the high frequency signal and of the control signal. In the method, the means for generating a control signal provide a periodic signal comprising positive and negative alternations and the means for generating a high frequency signal inject a high frequency signal at substantially equal quantity during as many positive alternations as negative alternations of the control signal.

Display device with proximity detection and method of using said device

The invention concerns an electronic display device comprising means of detection of proximity of a conducting element situated in proximity to a display zone of the device, a set of row electrodes () and of column electrodes scanning the display zone, means for generating an excitation of the row electrodes and of the column electrodes as a function of an image to be displayed on the display zone. The proximity detection means comprise:

Proximity detection matrix display device

A process for detecting the point of touching of a tactile surface. A high frequency signal is sequentially supplied to four corners of a plate having a capacitive surface. This is accomplished by supplying one diagonal with the others being idle. The output voltages are measured at the four corners for all the various possible positions of touching. Relations between voltages are established from these measurements obtained for each diagonal. During touching, the relations obtained are compared with those stored in order to locate the point of touching.

Method for optimizing the detection of the contact point of tactile capacitance surface

A tactile designation device comprises a continuous transparent capacitive surface supported at its corners by flexible strips to which there are attached strain gauges, a HF supply source, a series capacitor, a multiplexer, a detection circuit and a computer. The corners of the capacitive surface are connected alternately to the HF voltage, and the voltages measured are compared with a table of values to determine the touch point.

Tactile designation device with high-resolution transparent capacitive

A process and device for providing and fixing a captor of activation detection. The present invention discloses a tactile designation device for continuous capacitance detection comprising a glass plate covered by a metallic deposit on its entire surface and supported by flexible strips, means of supply of the metallized surface, and strain gauges mounted on top of the strips in order to measure their flexing. According to the present invention, the strips support the plate from a printed circuit of assembly. Each strip comprises at least one conducting part in contact, at one of its ends, with a supply track formed by the printed circuit, and at its other end, with the attachment devices of the plate on the strip that is electrically conducting and in contact with the metallized surface.

Method and apparatus for providing a touch screen

A method and device for stimulating the finger of an operator acting on a static keyboard, which method consists in making at least part of the keyboard mobile on which the finger of the user bears at least partially when it actuates a key, detecting at least one component of the force exerted by the finger on the keyboard during such actuation and causing a pre-established movement of the mobile part of the keyboard when the value of this component exceeds or has exceeded a threshold value.

Method for stimulating the finger of an operator acting on a static

A method is provided for optimizing the contrast and the angle of view of a liquid crystal display, this method consisting in periodically energizing a given zone of the display, permanently measuring the luminance of this zone so as to obtain at all times a pair of values corresponding respectively to the luminance of the zone in the energized state and to the luminance of the zone in the de-energized state, determining the contrast from the values of each of said pairs each of the measured luminance values and adjusting the control voltage of the cell display as a function of the contrast thus defined.

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Elancourt, France

Pierre Fagard