EP0375328A2
Expired / Lapsed
EP
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Tablet integrated with display
Assignee: Sharp Corp
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Filing: 1989-12-18
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Granted: —
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Expires: 2009-12-18
Abstract
Abstract A tablet integrated with a display comprising a matrix panel having row and column electrodes, a detecting conductor, a row electrode driver, a column electrode driver, a row coordinate detecting circuit and a column coordinate detecting circuit, in case of display mode, the row electrode driver applying the row scanning pulse successively to every row electrode of the matrix panel from one to another, and the column electrode driver applying voltage in accordance with the display data simultaneously to the column electrode of the matrix panel each time the row scanning pulse is applied successively to the row electrode of the matrix panel, in case of row detection mode, the row electrode driver applying the row scanning pulse successively to the row electrode of the matrix panel, and receiving the row scanning pulse detected through electrostatic capacitive coupling caused by the detecting conductor touching an arbitrary position on the matrix panel, so as to present the row coordinate of the position which the detecting conductor touches, and in case of column detection mode, the column electrode driver applying the column scanning pulse successively to the column electrode of the matrix panel, and the column coordinate detecting circuit receiving the column scanning pulse detected through electrostatic capacitive coupling caused by the detecting conductor touching an arbitrary position on the matrix panel, so as to present the column coordinate of the position which the detecting conductor touches.
Inventors
- 👤 Masahiro Ise
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 11:04
CPC Classifications
G; G06; G06F; G06F3/00; G06F3/01; G06F3/03; G06F3/041; G06F3/0412; G06F3/044; G06F3/0441
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
356 words
A tablet integrated with a display comprising: a matrix panel for display, having row and column electrodes; a detecting conductor which can be coupled capacitively with the row and column electrodes when touched on the matrix panel; a row electrode driver for applying a row scanning pulse successively to every row electrode of the matrix panel; a column electrode driver for applying a column scanning pulse successively to every column electrode of the matrix panel and applying voltage corresponding to display data for a specific period of time; a timing generator for transferring the display data to the column electrode driver and applying timing signals for determining timings of the row and column scanning pulses to the row electrode driver and the column electrode driver; a row coordinate detecting circuit electrically connected to the detecting conductor, for detecting a row coordinate; and a column coordinate detecting circuit electrically connected to the detecting conductor, for detecting a column coordinate, in case of display mode, the row electrode driver applying the row scanning pulse successively to every row electrode of the matrix panel from one to another, and the column electrode driver applying voltage in accordance with the display data simultaneously to the column electrode of the matrix panel each time the row scanning pulse is applied successively to the row electrode of the matrix panel, in case of row detection mode, the row electrode driver applying the row scanning pulse successively to the row electrode of the matrix panel, and receiving the row scanning pulse detected through electrostatic capacitive coupling caused by the detecting conductor touching an arbitrary position on the matrix panel, so as to present the row coordinate of the position which the detecting conductor touches; and in case of column detection mode, the column electrode driver applying the column scanning pulse successively to the column electrode of the matrix panel, and the column coordinate detecting circuit receiving the column scanning pulse detected through electrostatic capacitive coupling caused by the detecting conductor touching an arbitrary position on the matrix panel, so as to present the column coordinate of the position which the detecting conductor touches.
Claim 2
Dependent Claim
356 words
A tablet integrated with a display comprising: a matrix panel for display, having row and column electrodes; a detecting conductor which can be coupled capacitively with the row and column electrodes when touched on the matrix panel; a row electrode driver for applying a row scanning pulse successively to every row electrode of the matrix panel; a column electrode driver for applying a column scanning pulse successively to every column electrode of the matrix panel and applying voltage corresponding to display data for a specific period of time; a timing generator for transferring the display data to the column electrode driver and applying timing signals for determining timings of the row and column scanning pulses to the row electrode driver and the column electrode driver; a row coordinate detecting circuit electrically connected to the detecting conductor, for detecting a row coordinate; and a column coordinate detecting circuit electrically connected to the detecting conductor, for detecting a column coordinate, in case of display mode, the row electrode driver applying the row scanning pulse successively to every row electrode of the matrix panel from one to another, and the column electrode driver applying voltage in accordance with the display data simultaneously to the column electrode of the matrix panel each time the row scanning pulse is applied successively to the row electrode of the matrix panel, in case of row detection mode, the row electrode driver applying the row scanning pulse successively to the row electrode of the matrix panel, and receiving the row scanning pulse detected through electrostatic capacitive coupling caused by the detecting conductor touching an arbitrary position on the matrix panel, so as to present the row coordinate of the position which the detecting conductor touches; and in case of column detection mode, the column electrode driver applying the column scanning pulse successively to the column electrode of the matrix panel, and the column coordinate detecting circuit receiving the column scanning pulse detected through electrostatic capacitive coupling caused by the detecting conductor touching an arbitrary position on the matrix panel, so as to present the column coordinate of the position which the detecting conductor touches.
Claim 3
Dependent Claim
17 words
A tablet according to claim 1, wherein the matrix panel is a thin film electroluminescent matrix panel.
Claim 4
Dependent Claim
16 words
A tablet according to claim 1, wherein the matrix panel is a liquid crystal matrix panel.
Claim 5
Dependent Claim
15 words
A tablet according to claim 1, wherein the matrix panel is an AC plasma display.
Claim 6
Dependent Claim
214 words
A tablet according to claim 1, wherein the row electrode driver includes a first shift register having output terminals corresponding in number to the row electrodes of the matrix panel, a first switch circuit having changeover switches which correspond in number to the row electrodes and change over in response to a signal outputted from each of the output terminals of the first shift register, and a first gate circuit applying a row scanning pulse of a specified voltage to each of the row electrodes in response to a signal outputted from the fits switch circuit; and the column electrode driver includes a second shift register having output terminals corresponding in number to the column electrodes of the matrix panel, a latch circuit having output terminals corresponding in number to the column electrodes, for latching a signal outputted from each of the output terminals of the second shift register, a second switch circuit having changeover switches which correspond in number to the column electrodes and change over in response to a signal outputted from the latch circuit, and a second gate circuit for applying voltage corresponding to the display data and the column scanning pulse to each of the column electrodes in response to a signal outputted from the second switch circuit, with timesharing.
Claim 7
Dependent Claim
21 words
A tablet according to claim 5, wherein each of the row and column coordinate detecting circuits is a reset table counter.
Claim 8
Dependent Claim
59 words
A tablet according to claim 1, further comprising a comparator electrically connected to the row and column coordinate detecting circuits for comparing a signal outputted from the detecting conductor with a reference voltage, each of the row and column coordinate detecting circuits starting its operation when a signal outputted from the detecting conductor equals the reference voltage or above.
Claim 9
Dependent Claim
59 words
A tablet according to claim 5, further comprising a comparator electrically connected to the row and column coordinate detecting circuits, for comparing a signal outputted from the detecting conductor with a reference voltage, each of the row and column coordinate detecting circuits starting its operation when the signal outputted from the detecting conductor equals the reference voltage or above.
Claim 10
Dependent Claim
67 words
A tablet according to claim 1, further comprising a disturbing signal canceling conductor for detecting the scanning pulse of each of the row electrodes at least in detecting the row coordinate, and a differential amplifier outputting to each of the row and column coordinate detecting circuits a difference signal between a signal outputted from the disturbing signal canceling conductor and a signal outputted from the detecting conductor.
Claim 11
Dependent Claim
106 words
A tablet integrated with a display comprising a matrix display panel (101) which has row (y) and column (x) electrodes, and a tablet including a detecting conductor for being coupled with sensing electrodes by being touched on a surface of the conductor to define the position of touching thereon, characterised by means (102, 103) for operating the column (x) and row (y) electrodes in a first mode to provide a display on the panel (101), and means (102, 103, 104, 107, 108) for operating said electrodes in a second mode to provide an output as a function of a point of touching on the detecting conductor.
Claim 12
Dependent Claim
106 words
A tablet integrated with a display comprising a matrix display panel (101) which has row (y) and column (x) electrodes, and a tablet including a detecting conductor for being coupled with sensing electrodes by being touched on a surface of the conductor to define the position of touching thereon, characterised by means (102, 103) for operating the column (x) and row (y) electrodes in a first mode to provide a display on the panel (101), and means (102, 103, 104, 107, 108) for operating said electrodes in a second mode to provide an output as a function of a point of touching on the detecting conductor.
References Cited (Backward Citations)
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