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EP0601837A2
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Image input device-integrated type display device
Assignee: Sharp Corp
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Filing: 1993-12-07
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Granted: —
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Expires: 2013-12-07
Abstract
Abstract There is provided an image input device-integrated type display device concurrently having an image display function, a document image input function, and a pen input function. A common electrode (Y) of the image input device-integrated type display unit (1) is formed on a glass plate (28). A segment electrode (X) is formed on a micro lens (27) of a glass plate (29). An island electrode (23) located at each pixel is connected to the segment electrode (X) via a photoconductor (22). Liquid crystals (21) are interposed between the common electrode (Y) and the island electrode (23). In an image input mode, light reflected on a document is applied to the photoconductor (22) to control a voltage applied to the liquid crystals (21). In a pen input mode, light from an input pen is applied to the photoconductor (22) to control a voltage applied to the liquid crystals (21). In an image display mode, a voltage applied to the liquid crystals (21) is controlled according to image data of each pixel. Thus brightness data of the document, position data of the input pen, and image data corresponding to a display signal are written into the image input device-integrated type display unit (1).
Inventors
- 👤 Masayuki Katagiri
- 👤 Noritoshi Kako
- 👤 Takao Tagawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-10 01:19
CPC Classifications
G; G06; G06F; G06F3/00; G06F3/01; G06F3/03; G06F3/041; G06F3/042; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/135; G02F1/1333; G02F1/1335; G02F1/133526; G09; G09G; G09G3/00; G09G3/02
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
629 words
An image input device-integrated type display device comprising: a display unit (1) having a plurality of transparent segment electrodes (X) arranged in parallel with each other on a transparent substrate (29); a plurality of transparent common electrodes (Y) arranged in parallel with each other on another transparent substrate, said common electrodes (Y) being perpendicular to said segment electrodes (X), a photoconductor (22) electrically connected to either the segment electrode (X) or the common electrode (Y) and arranged in a pixel composed of an area of intersection between the segment electrode (X) and the common electrode (Y), a transparent island electrode (23) electrically connected to the photoconductor (22) and arranged in between the segment electrode (X) and the common electrode (Y) relevant to the pixel, liquid crystals (21) interposed between the island electrode (23) and an electrode which is one of the segment electrode (X) and the common electrode (Y) and is not electrically connected to the photoconductor (22), and a light shielding film (25) for shielding only light applying on the side of the electrode which is one of the segment electrode (X) and the common electrode (Y) and is not electrically connected to the photoconductor (22) so that the light does not reach the photoconductor (22); a display illumination light source (11) which radiates display illumination light in displaying an image on a pixel matrix composed of areas of intersections between the plural segment electrodes (X) and the plural common electrodes (Y) of the display unit (1); a document illumination light source (11) which radiates document illumination light in copying an optical image of a document into the pixel matrix of the display unit (1); a control light source (11) which radiates control light for optically controlling turning-on and turning-off of a voltage to be applied to liquid crystals (21) of the display unit (1); a display control circuit (6) which generates a display signal for displaying an image on the pixel matrix of the display unit (1); an image input control circuit (8) which generates an image input signal for copying an optical image of the document into the pixel matrix of the display unit (1); an image read control circuit (7) which generates an image read signal for reading image data written in the liquid crystals (21) of each pixel constituting the pixel matrix of the display unit (1) in the form of an electric signal; a segment electrode driving circuit (3) which drives the segment electrode (X) based on the display signal from the display control circuit (6), the image input signal from the image input control circuit (8), or the image read signal from the image read control circuit (7); a common electrode driving circuit (2) which drives the common electrode (Y) based on the display signal from the display control circuit (6), the image input signal from the image input control circuit (8), or the image read signal from the image read control circuit (7); an image data detection circuit (9) which detects the image data written in the pixel matrix of the display unit (1) in the form of an electric signal; and a control circuit (13) which copies the optical image of the document into the pixel matrix by controlling the image input control circuit (8), the document illumination light source (11), and the control light source (11) in an image input mode, reads the image data written in the pixel matrix in the form of an electric signal by controlling the image read control circuit (7), the image data detection circuit (9), and the control light source (11) in an image read mode, and displays an image on the pixel matrix by controlling the display control circuit (6) and the display illumination light source (11) in an image display mode.
Claim 2
Dependent Claim
30 words
An image input device-integrated type display device as claimed in Claim 1, wherein phase transition type liquid crystals (21) having a storage function are used as the liquid crystals (21).
Claim 3
Dependent Claim
46 words
An image input device-integrated type display device as claimed in Claim 1, wherein n-type cholesteric liquid crystals, liquid crystals formed by mixing n-type cholesteric liquid crystals with n-type nematic liquid crystals, or smectic-A liquid crystals having a storage function are used as the liquid crystals (21).
Claim 4
Dependent Claim
640 words
An image input device-integrated type display device comprising: a display unit (1) having a plurality of transparent segment electrodes (X) arranged in parallel with each other on a transparent substrate (29); a plurality of transparent common electrodes (Y) arranged in parallel with each other on another transparent substrate (28), said common electrodes (Y) being perpendicular to said segment electrodes (X), a photoconductor (22) electrically connected to either the segment electrode (X) or the common electrode (Y) and arranged in a pixel composed of an area of intersection between the segment electrode (X) and the common electrode (Y), a transparent island electrode (23) electrically connected to the photoconductor (22) and arranged in between the segment electrode (X) and the common electrode (Y) relevant to the pixel, liquid crystals (51) interposed between the island electrode (23) and an electrode which is one of the segment electrode (X) and the common electrode (Y) and is not electrically connected to the photoconductor (22), and a polarizer (52) for controlling a polarization direction of only light applying on a side of the electrode which is one of the segment electrode (X) and the common electrode (Y) and is not electrically connected to the photoconductor (22), said light being to able to reach the photoconductor (22) when the light passed through the polarizer (52); a display illumination light source (11) which radiates display illumination light in displaying an image on a pixel matrix composed of areas of intersections between the plural segment electrodes (X) and the plural common electrodes (Y) of the display unit (1); a document illumination light source (11) which radiates document illumination light in copying an optical image of a document into the pixel matrix of the display unit (1); a control light source (11) which radiates control light for optically controlling turning-on and turning-off of a voltage to be applied to liquid crystals (51) of the display unit (1); a display control circuit (6) which generates a display signal for displaying an image on the pixel matrix of the display unit (1); an image input control circuit (8) which generates an image input signal for copying an optical image of the document into the pixel matrix of the display unit (1); an image read control circuit (7) which generates an image read signal for reading image data written in the liquid crystals (51) of each pixel constituting the pixel matrix of the display unit (1) in the form of an electric signal; a segment electrode driving circuit (3) which drives the segment electrode (X) based on the display signal from the display control circuit (6), the image input signal from the image input control circuit (8), or the image read signal from the image read control circuit (7); a common electrode driving circuit (2) which drives the common electrode (Y) based on the display signal from the display control circuit (6), the image input signal from the image input control circuit (8), or the image read signal from the image read control circuit (7); an image data detection circuit (9) which detects the image data written in the pixel matrix of the display unit (1) in the form of an electric signal; and a control circuit (13) which copies the optical image of the document into the pixel matrix by controlling the image input control circuit (8), the document illumination light source (11), and the control light source (11) in an image input mode, reads the image data written in the pixel matrix in the form of an electric signal by controlling the image read control circuit (7), the image data detection circuit (9), and the control light source (11) in an image read mode, and displays an image on the pixel matrix by controlling the display control circuit (6) and the display illumination light source (11) in an image display mode.
Claim 5
Dependent Claim
24 words
An image input device-integrated type display device as claimed in Claim 4, wherein ferroelectric liquid crystals (51) are used as the liquid crystals (51).
Claim 6
Dependent Claim
150 words
An image input device-integrated type display device as claimed in Claim 5, wherein the image data detection circuit (9) detects a quantity of electric charges charged according to the image data at the island electrode (23) of each pixel constituting the pixel matrix of the display unit (1), the control light source (11) can irradiate light one by one on each electrode which is one of the segment electrode (X) and the common electrode (Y) and is not electrically connected to the photoconductor (22), and the control circuit (13) reads the image data written in pixel matrix in the form of an electric signal by detecting a quantity of electric charges charged at the island electrode (23) of the pixel relevant to the one segment electrode (X) or common electrode (Y) which is selected by being irradiated by light of the control light source (11) in the image read mode.
Claim 7
Dependent Claim
80 words
An image input device-integrated type display device as claimed in Claim 1, further comprising an input pen (10) which has a light source (41) and emits light from the light source (41) outwardly through its tip end, and wherein the control circuit (13) controls the image input control circuit (8) and the control light source (11) in a pen input mode to allow an image input by means of the input pen (10) to be written into the pixel matrix.
Claim 8
Dependent Claim
80 words
An image input device-integrated type display device as claimed in Claim 4, further comprising an input pen (10) which has a light source (41) and emits light from the light source (41) outwardly through its tip end, and wherein the control circuit (13) controls the image input control circuit (8) and the control light source (41) in a pen input mode to allow an image input by means of the input pen (10) to be written into the pixel matrix.
Claim 9
Dependent Claim
38 words
An image input device-integrated type display device as claimed in Claim 1, wherein one of the two transparent substrates (28, 29) of the display unit (1) is provided with a micro lens (27) for condensing incident light thereto.
Claim 10
Dependent Claim
38 words
An image input device-integrated type display device as claimed in Claim 4, wherein one of the two transparent substrates (28, 29) of the display unit (1) is provided with a micro lens (27) for condensing incident light thereto.
Claim 11
Dependent Claim
68 words
An image input device-integrated type display device as claimed in Claim 1, wherein at least one of the two transparent substrates (28, 29) of the display unit (1) is comprised of a plate-shaped optical fiber array (61) where optical fibers (62) each having a specified length are arranged two-dimensionally with axial directions of the optical fibers (62) extended in a thickness direction of the optical fiber array (61).
Claim 12
Dependent Claim
68 words
An image input device-integrated type display device as claimed in Claim 4, wherein at least one of the two transparent substrates (28, 29) of the display unit (1) is comprised of a plate-shaped optical fiber array (61) where optical fibers (62) each having a specified length are arranged two-dimensionally with axial directions of the optical fibers (62) extended in a thickness direction of the optical fiber array (61).
Claim 13
Dependent Claim
59 words
An image input device-integrated type display device as claimed in Claim 1, wherein the display illumination light source (11), the document illumination light source, and the control light source are comprised of one plate-shaped light source (11), and a side portion of the plate-shaped light source (11) is pivotally mounted to a side portion of the display unit (1).
Claim 14
Dependent Claim
58 words
An image input device-integrated type display device as claimed in Claim 4, wherein the display illumination light source, the document illumination light source, and the control light source are comprised of one plate-shaped light source (11), and a side portion of the plate-shaped light source (11) is pivotally mounted to a side portion of the display unit (1).
Claim 15
Independent Claim
230 words
A device which is selectively operable in a first mode for image input by light illumination, and a second mode for image display by the application of electrical signals, the device comprising: a first set of parallel elongate transparent electrodes; a second set of parallel elongate transparent electrodes spaced from and extending transverse to the electrodes of said first set to define an array of pixel areas at their crossing points; a corresponding array of transparent island electrodes which are electrically unconnected to each other and are disposed at the respective pixel areas between the first and second sets of elongate electrodes; a corresponding array of photoconductive elements interconnecting the respective island electrodes and the electrodes of said first set, so that each line of said photoconductive elements connects a corresponding line of island electrodes to a respective said electrode of the first set; a display medium disposed between said island electrodes and the second set of elongate electrodes; means operable in the second mode to illuminate all of the photoconductive elements so that display control signals applied to the first elongate electrodes are applied to the island electrodes; and means operable in the first mode to apply a predetermined image input voltage to said first electrodes, and to selectively illuminate the photoconductive elements so as to cause said image input voltage to be applied to imagewise selected island electrodes.
References Cited (Backward Citations)
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