Display integrated type position reading apparatus

G - Physics – 06 – F

Patent

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G06F 3/033 (2006.01)

Patent

CA 2083616

A display integrated type position reading apparatus includes a display device driven for display in accordance with a driving signal in synchronization with a predetermined clock signal, and a conductive tablet mounted on a display screen of the display device. In operation, a CPU controls a tablet controller to apply voltage to the tablet. In response to a depression of an arbitrary position on the main surface of the tablet, the CPU reads out the depressed position as a digital signal via an A/D converter. The sampling by the A/D converter relating to the reading is carried out at sampling points so as to avoid the mixing of noise caused by a signal for driving the display unit into the digital signal, resulting in an improvement in the read out accuracy of the depressed position.

L'invention est un appareil de lecture de positions dans lequel sont intégrés un afficheur piloté par un signal synchronisé avec un signal d'horloge prédéterminé et une tablette conductrice montée sur l'écran d'affichage. Une unité centrale commande un contrôleur qui applique une tension à la tablette. Quand un point quelconque de la surface principale de la tablette est enfoncé, l'unité centrale détermine l'endroit où la surface a été enfoncée par le biais d'un signal numérique transmis via un convertisseur analogique-numérique. Pour localiser les points enfoncés, le convertisseur effectue son échantillonnage à des points particuliers afin d'éviter de mélanger au signal numérique le bruit du signal d'attaque de l'unité d'affichage, ce qui permet de localiser le point enfoncé avec une plus grande précision.

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