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Digitiser

A digital converter and capacitor technology, applied in the direction of electrical digital data processing, instrumentation, input/output process of data processing, etc., can solve problems such as digital converter constraints

Inactive Publication Date: 2014-12-17
ALTERIX
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This imposes further constraints on the design of the digitizer

Method used

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Examples

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no. 1 example

[0226] overview

[0227] image 3 is a schematic block diagram showing the main components of the X-Y digitizer 1 used in this embodiment to sense user input from one or more fingers or from one or more conductive stylus (not shown). The digitizer comprises a grid 3 of excitation conductors 5-0, 5-1, ..., 5-Xmax-1 and a plurality of detection conductors 7-0, 7-1, ..., 7-Ymax. In this example, if image 3 Schematically shown, the excitation conductor 5 and the detection conductor 7 are arranged along orthogonal directions. When the digitizer 1 is used to form a touch screen, the excitation conductor 5 and the detection conductor 7 are overlaid on top of a display screen (not shown).

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Abstract

A number of different designs of digitiser are disclosed. One disclosed digitiser comprises a grid of conductors comprising a plurality of excitation conductors and a plurality of detection conductors; excitation circuitry for applying excitation signals to selected excitation conductors; measurement circuitry for obtaining measurements from selected detection conductors; and processing circuitry for processing measurements obtained by the measurement circuitry to detect one or more objects positioned adjacent the grid of conductors. The excitation circuitry may be arranged to operate in a cyclic manner to select each of the excitation conductors during an excitation cycle, wherein an excitation cycle comprises a sequence of excitation intervals during each of which a different pair of neighbouring excitation conductors is selected by the excitation circuitry and to which complementary excitation signals are applied, and wherein the excitation circuitry is arranged to polarity modulate each excitation signal using a polarity control signal so that the polarity of the excitation signal applied to a selected conductor changes during a time that the excitation conductor is selected.

Description

technical field [0001] The present invention relates to a digitizer for use in a position sensor, and in particular to a digitizer for use in a capacitive touch screen. Background technique [0002] Computer devices are well known and significant research has been done on human-computer interaction allowing humans to interact with computer devices. For example, capacitive touchpads are well known and allow users to move a cursor on the screen by moving their fingers across the touchpad. Touch screens are also known in which an X-Y digitizer is mounted on or below the surface of a computer display and allows users to make selections directly on the display with their fingers or conductive or electromagnetic stylus. A digitizer commonly used in the touch screen has a conductor grid arranged vertically on the display screen and electronics arranged to follow the finger (and / or stylus) on the screen The movement on measures the change in mutual capacitance at each intersection...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/044G06F3/041
CPCG06F3/04166G06F3/0446G06F3/0445G06F3/0416G06F3/044G06F3/0412G06F3/047G06F3/046G06F2203/04106
Inventor 维克托·日托米尔斯基
Owner ALTERIX
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