JPH0589230A - Image read/display device - Google Patents

Abstract

PURPOSE:To perform the display and the reading of a two-dimensional image by one device. CONSTITUTION:An image reading means is formed by forming a light receiving element 6 and black passivation film 8 on a transparent substrate 2, and a stripe shape transparent electrode 9 is formed on the transparent substrate 1, and an image display means is formed by sealing liquid crystal 7 between the transparent substrates 1 and 2, and a plane light emitting element 4 and light shielding film 10 are formed on a transparent substrate 3, and furthermore, a plane light emitting means is formed by forming a light transmission window 5 at a position confronting with the light receiving element 6. Image display is performed by displaying the image with a simplex matrix system to control a voltage being impressed between the transference electrode 9 and a columnar direction electrode. The reading of the image is performed by making an original bring into contact closely with the transparent substrate 3 and having the plane light emitting element 4 emit light.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image input / output device for information related equipment such as a computer, and more particularly to an image reading / display device capable of displaying information and reading a two-dimensional image.

[0002]

2. Description of the Related Art In recent years, many information-related devices have an image input device in addition to an image display device for displaying information. As an image display device, CR
T, liquid crystal display (LCD), EL display (EL
D), plasma display (PDP), and other various methods are used. Among them, LCDs have low power consumption, and because they are excellent in colorization, they are clocks and electronic desk calculators. It is widely used from a small device such as a computer to a large device such as a laptop personal computer having a size of 10 inches.

On the other hand, as an image sensor used in an image reading device which is one of image input devices, a CCD is used.
Alternatively, an image sensor using a photoelectric conversion film such as amorphous silicon (a-Si) is widely adopted. C
Since the CD is formed on a silicon wafer, it is widely used as a small image sensor mainly in TV cameras and the like. On the other hand, an image sensor using a photoelectric conversion film such as a-Si is widely used by a vapor deposition method or a sputtering method. Since it can be formed on a substrate having a large area, it is mainly used as an image sensor for reading an original such as a facsimile.

By the way, conventionally, the image display device and the image reading device were installed as separate devices, but attempts have been made to reduce the size by combining the image display device and the image reading device. -106467, it has been proposed that a display element for displaying an image and a light receiving element for reading an image be arranged close to each other on the same substrate. It has been proposed to provide an LCD on the.

[0005]

SUMMARY OF THE INVENTION
In order to put the one shown in JP-A 1-106467 into practical use, it is necessary to use a large substrate, and it is necessary to add a light source for reading an image separately, so it must be a large-scale device. It ’s something I ca n’t get. In addition, JP-A-59-193
The device disclosed in Japanese Patent Publication No. 69 is suitable for a small device such as a TV camera, but cannot be applied to a device for reading an image of a large-area original.

An object of the present invention is to solve the above-mentioned problems and not only display information but also read a large area two-dimensional image, and further reduce the size of the image reading / display apparatus. It is intended to provide.

[0007]

Therefore, in the image reading / displaying apparatus of the present invention, the light receiving elements arranged two-dimensionally on the first transparent substrate and the light receiving elements are driven. Liquid crystal is sealed between the first transparent substrate and the second transparent substrate, and an image reading unit in which first and second stripe-shaped electrodes that are orthogonal to each other are sequentially formed. A second transparent substrate facing the first and second stripe-shaped electrodes, and
Alternatively, an image display unit including a third striped electrode arranged so as to be orthogonal to any one of the second striped electrodes, the third striped electrode, and the first or the third striped electrode orthogonal thereto. Image display drive means for selectively applying a drive voltage for image display to the second stripe-shaped electrode, and a light source on the side of the first transparent substrate opposite to the side on which the image display means is provided. The above-mentioned object is achieved by including a surface emitting means having a surface emitting element having a transmission window.

In the image reading / display apparatus of the present invention, when displaying an image, only the image display means is driven to display the image as in the conventional LCD, and when the image is read, The surface emitting means and the image reading means are driven, and the light emitted from the surface emitting means is reflected by the document and is incident on the light receiving element to read the image.

Therefore, according to the present invention, it is possible to realize an apparatus capable of displaying an image and reading an image. The image reading means includes a two-dimensional image sensor,
Moreover, since the surface light emitter is used as the light source, it is not necessary to provide a driving means for moving the light source and the like as in the conventional image reading apparatus, and the size can be reduced. Further, the substrate of the image reading means, that is, the substrate on which the light receiving element is formed is also used as the substrate for enclosing the liquid crystal for image display, and the electrode for driving the light receiving element is also used for driving the liquid crystal display element. Therefore, it can be constructed at low cost.

[0010]

Embodiments will be described below with reference to the drawings.
FIG. 1 is a perspective view showing a schematic configuration of an embodiment of an image reading / displaying device according to the present invention, and FIG. 2 is a detailed sectional view thereof.

A light receiving element 6 is two-dimensionally formed on a transparent substrate 2 made of glass or the like, and the light receiving element 6 is further formed thereon.
Black passivation film 8 covering polyimide
Is formed to form an image reading unit. In this embodiment, the light receiving element 6 uses a photodiode formed of a-Si, but any light receiving element 6 having a photoelectric conversion function can be used. Other than the formed photodiode, CdS, CdSe, a TFT-driving a-Si photoelectric conversion element, or the like can be used. Although not shown in FIGS. 1 and 2, an electrode in a row direction and an electrode in a column direction which are orthogonal to each other are required to drive the light receiving element 6, but these electrodes will be apparent from a later description. As it is, it is formed on the light receiving element 6. Further, instead of the black passivation film 8, a combination of a transparent passivation film and a light shielding film can be used.

Striped transparent electrodes 9 are formed on the transparent substrate 1 made of glass or the like, and the transparent substrate 1 and the transparent substrate 2 are formed.
The liquid crystal 7 is enclosed between and to form an image display means. The striped electrodes 9 are arranged at positions facing the row-direction electrodes and column-direction electrodes for driving the light-receiving elements 6 so as to be orthogonal to either the row-direction electrodes or the column-direction electrodes. Therefore, a region between the transparent electrode 9 and a row-direction electrode or a column-direction electrode orthogonal to the transparent electrode 9 among the electrodes for driving the light receiving element 6 becomes a liquid crystal display element. In this embodiment, as the liquid crystal 7, a liquid crystal material in which a spherical small liquid crystal capsule is dispersed in an organic polymer is not required and a deflecting plate is not used. However, it is opposite to the transparent electrode 9 side of the transparent substrate 1. Obviously, it is also possible to use a liquid crystal material using a deflector if the deflector is arranged on the side surface. It is also possible to use a liquid crystal material such as a guest-host mode.

A surface emitting element 4 and a light shielding film 10 are formed in this order on a transparent substrate 3 made of glass or the like, and a light transmitting window 5 is formed at a position facing the light receiving element 6 to form a surface emitting means. Has been formed. In this embodiment, the surface emitting element 4
Is an EL light emitting element that uses electroluminescence, but LED
Any surface emitting element that can be used as a light source for image reading such as (Light Emitting Diode) can be generally used. Further, the light shielding film 10 is for preventing the light emitted from the surface light emitting element 4 from directly entering the light receiving element 6.

The light-shielding film 10 is made of Al, Cr for the EL light emitting element.
Of course, an opaque material such as can be formed by depositing a film by a vapor deposition method, a sputtering method, or the like, but the electrode of the EL light emitting element can also be used as the light shielding film 10. That is, as shown in FIG. 3, the transparent electrode 3 is formed on the transparent substrate 3.
0, the insulating layer 31, the light emitting layer 32, the insulating layer 33, and the back electrode 34 made of Al are laminated in this order to form the surface light emitting element 4 including the light shielding film 10.

Next, the structure of the light receiving element 6 and its drive circuit will be described in detail. FIG. 4 is a diagram showing an equivalent circuit of the light receiving elements 6 arranged two-dimensionally.
Has a configuration in which two photodiodes are connected in series in opposite directions. A shift register 11 is connected to the electrodes in the column direction, an analog switch 12 is connected to the electrodes in the row direction, and a current / voltage converter 13 is connected to the analog switch 12. Then, the reading operation is performed row by row, and the signal of each element is taken out from the current / voltage converter 13 by the shift register 11.

FIG. 5 is a diagram showing an example of the layout of the light receiving element 6 and the striped electrodes in the row and column directions. In the figure, 6 is a light receiving element, 14 is a row direction electrode, and 15 is a column direction. An electrode is shown. Now, assuming that the transparent electrode 9 for driving the liquid crystal display element is arranged so as to be orthogonal to the column direction electrode 15, the portion indicated by A in the drawing is an electrode for driving the liquid crystal display element. Shared as.

FIG. 6 is a view showing a cross section taken along the line BB ′ of FIG. 5, in which a transparent electrode 16 is formed on the transparent substrate 2, and an n-type doped photoelectric conversion film 17 and a-Si photoelectric conversion are formed thereon. The film 18 and the electrode 20 are formed. Therefore, the two photodiodes forming the light receiving element 6 are formed between the transparent electrode 16 and the electrode 20, respectively. The contact electrode 21 connected to the row-direction electrode 14 via the insulating layer 19 is connected to the electrode 20 of one photodiode, and the column-direction electrode 15 is connected to the electrode 2 of the other photodiode.
It is connected to 0.

Next, the operation of the image reading / display device shown in FIG. 1 will be described. First, when the image reading / display device is used as an image display device, an image can be displayed by a simple matrix method in which a voltage applied between the transparent electrodes 9 and the column-direction electrodes 15 is controlled. That is, since the alignment of the liquid crystal is random when no voltage is applied to the transparent electrodes 9 and the column-direction electrodes 15,
Light incident from the transparent substrate 1 side is scattered and appears white,
As shown in FIG. 7, when a predetermined voltage is applied to the column-direction electrodes 15 and the transparent electrodes 9, the alignment of the liquid crystal is aligned, so that the incident light is transmitted and the black passivation film 8 as the base is transmitted.
Therefore, the black color can be seen, so that the image displayed from the transparent substrate 1 side can be observed by selectively applying a predetermined voltage to the liquid crystal display element.

When the image reading / display device is used as an image reading device, as shown in FIG. 8, the original 22 is brought into close contact with the transparent substrate 3 and the surface emitting element 4 is caused to emit light. The light emitted from the surface light emitting element 4 and reflected by the document 22 enters the light receiving element 6 through the light transmitting window 5. Since the amount of light incident on the light receiving element 6 changes according to the image information of the original 22, that is, the density of the image, the light receiving element 6
An electric signal corresponding to the density of each pixel is obtained from, and an image is read by this.

Further, as shown in FIG. 9, it is possible to directly input the light of the optical light pen 25 to the light receiving element 6 to input an arbitrary handwritten image, and as shown in FIG. It is also possible to arrange the image forming lens 26 on the transparent substrate 3 side and form an image of a subject (not shown) on the light receiving element 6 by the image forming lens 26 to pick up a desired image.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment and various modifications can be made. For example, although the surface emitting element 4 is formed on the entire surface of the transparent substrate 3 in the above-described embodiment, the surface emitting element can be formed in a stripe shape as shown by 4a and 4b in FIG. However, the stripes need to be formed corresponding to the row direction of the light receiving elements 6, that is, the same light receiving element column as the arrangement direction of the shift register 11 in FIG. That is, since the signal reading operation from the light receiving element is performed row by row as described above, it is not necessary to make the surface light emitting elements 4 emit light simultaneously over the entire surface, and at least the row corresponding to the signal reading operation is performed. It is clear that only the area needs to be made to emit light, and therefore the surface emitting element can be formed in a stripe shape for each row in which the reading operation of the light receiving element is performed. And according to this, power consumption can be reduced. Further, one light emitting element may be formed corresponding to one light receiving element.

[Brief description of drawings]

FIG. 1 is a perspective view showing a schematic configuration of an embodiment of the present invention.

2 is a more detailed cross-sectional view of the configuration shown in FIG.

FIG. 3 is a diagram showing a structural example of a surface emitting element.

FIG. 4 is a diagram showing an equivalent circuit of light receiving elements arranged two-dimensionally.

FIG. 5 is a diagram showing an example of a layout of light receiving elements and stripe-shaped electrodes in the row and column directions.

6 is a sectional view taken along line BB ′ of FIG.

FIG. 7 is a diagram for explaining an operation when used as an image display device.

FIG. 8 is a diagram for explaining an operation when used as an image reading device.

FIG. 9 is a diagram for explaining an image input method using an optical light pen.

FIG. 10 is a diagram for explaining an image input method using an imaging lens.

FIG. 11 is a diagram showing a modified example.

[Explanation of symbols]

1, 2, 3 ... Transparent substrate, 4 ... Surface emitting element, 5 ... Light transmitting window, 6 ... Light receiving element, 7 ... Liquid crystal, 8 ... Passivation film, 9 ... Transparent electrode, 10 ... Shading film.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Internal reference number FI Technical display location G09F 9/30 A 7926-5G H01L 27/14 31/04 H04N 1/028 Z 9070-5C 5 / 335 Z 8838-5C

Claims (1)

[Claims] 1. A light receiving element which is two-dimensionally arranged and first and second striped electrodes which are orthogonal to each other for driving the light receiving element are sequentially formed on a first transparent substrate. Liquid crystal is enclosed between the image reading means and the first transparent substrate and the second transparent substrate, and the liquid crystal is provided on the second transparent substrate so as to face the first and second striped electrodes. An image display unit including a third striped electrode arranged so as to cross at least one of the first or second striped electrode, and the third striped electrode and the image display means orthogonal to the third striped electrode. The first
Alternatively, an image display drive unit that selectively applies a drive voltage for image display to the second stripe-shaped electrode, and a side of the first transparent substrate opposite to the side where the image display unit is arranged, An image reading / displaying device, comprising: a surface emitting device having a surface emitting element having a light transmitting window.