JP3211054B2 - Information reading device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information reading apparatus for reading an original or the like on which image information such as characters and figures are written, and more particularly to an apparatus used as an information portable terminal device.

[0002]

2. Description of the Related Art A light source for irradiating a document with light, a photoelectric converter in which elements are arranged in series and which receives light from the light source and converts the light into an electric signal, and a relative position between the photoelectric converter and the document are orthogonal. 2. Description of the Related Art An information reading apparatus including a scanning unit for moving a photoelectric conversion device in a moving direction and a data processing unit for transmitting an output electric signal of the photoelectric converter as a serial signal is widely used in a facsimile, a copying machine, and the like.

A hand scanner that reads a part of a manuscript or a sentence by connecting to a personal computer or a word processor is well known. This is also a one-dimensional line scanner and an information reading device with a limited capturing range.

[0004] In addition, as two-dimensional image capturing, 2
A device has been proposed in which a photocell is formed in a dimensional matrix, the photocell is used as a photosensitive element, and handwritten information and image information are input to a computer by light. For example, this type of coordinate input device has a configuration as shown in FIG. 21 (see, for example, Japanese Patent Application No. 59-117008). In FIG. 21, 130 is a glass substrate, 131 is a CdS layer made of a CdS sintered body, is formed in a stripe shape on the glass substrate 130, and has an X-coordinate detection electrode and n of a photovoltaic cell.
Works as a semiconductor. Reference numeral 132 denotes a CdTe layer made of a CdTe sintered body, which is formed in a stripe shape at right angles to the CdS layer 131 and functions as a p-type semiconductor of a photovoltaic cell. The intersection of the CdS layer 131 and the CdTe layer 132 becomes a photovoltaic cell. 133, a carbon electrode layer laminated on the CdTe layer 132;
It also works as a dopant to the second.

A method of using such a coordinate input device is described in, for example, "Sensor and Signal Processing" (published by Kyoritsu Shuppan, 19
1989, 2nd edition, 2nd printing, around 170 pages). Here, a semiconductor image sensor using a photodiode (PD) is illustrated.

For example, in the two-dimensional photodiode shown in FIG. 22, an element of (n, m) = (0, 0) is shifted to (0, 38).
The element is scanned to the element of (3), and then the element of (1,0) is scanned to the element of (1,383).
9, 383), the same scanning is repeated. As described above, devices that detect which light is incident on which photodiode have been proposed, but all of them are proposals of a two-dimensional sensor portion.

As described above, as a conventional technique, a device which takes in information by moving either a document or a line sensor portion by a mechanism, and a structure of a two-dimensional reading sensor have been proposed.

Recently, an image sensor in which an image reading element and a display function element are formed on the same insulating substrate has been proposed (see Japanese Patent Application Laid-Open No. 1-106467). This is to display while reading. However, the image reading element and the display function element are arranged at different places on the same insulating substrate, and the two elements are not overlapped. It is considered that the light source required for reading and the backlight required for display have separate structures.

An image reading / display apparatus in which a light receiving element for image reading and a display means using a display liquid crystal are formed on one panel has been proposed (Japanese Patent Laid-Open No. 5-89).
No. 230). This combines an image display function and an image reading function. The light receiving element and the display means are overlapped. However, the display mode and the reading mode are separate, and the display is not performed while reading.

Furthermore, in practice, it is very difficult to form two functions on one panel in a laminated state, and the yield is very poor in the production, so that it has not been practically used yet. In addition, it has not reached a state where it can be put to practical use even with the current technology.

[0011]

SUMMARY OF THE INVENTION A photoelectric converter, scanning means for moving a relative position between the photoelectric converter and a document in a direction orthogonal to each other, and data for transmitting an electric signal output from the photoelectric converter as a serial signal An information reading apparatus including a processing unit is widely used in facsimile machines, copiers, and the like, but has a drawback that a document or a photoelectric converter must be moved and the structure is complicated. . Also,
Hand scanners that read a part of a manuscript or a sentence by connecting to a personal computer or a word processor are often used, but they also have a disadvantage that the information range captured by a one-dimensional line scanner is limited. .

A coordinate input device and the like shown in FIG. 21 used in the two-dimensional capturing method include a glass substrate 130 and C-shaped stripes formed on the glass substrate 130 at right angles to each other.
The structure has a dS layer 131 and a CdTe layer 132, and further has two constituent layers on a glass substrate. Needless to say, the glass substrate has an optically high transmittance. However, both of the two layers formed on the glass substrate are cadmium-based sintered bodies and have extremely low light transmittance. Therefore, the image input device shown in FIG. 21 has a problem that the light transmittance from the glass surface side to the photovoltaic cell configuration layer side, or conversely, from the photovoltaic cell configuration layer side to the glass surface side is low. Furthermore, if the light transmittance is improved, the output signal becomes weak, and there are many problems in information reproduction such as noise countermeasures and signal amplification methods. However, there are still many problems in practical use.

Furthermore, in the conventional information reading apparatus, in many cases, the read information is sent to an external display device as data and displayed, and a single function of reading information that cannot be displayed is provided as an information portable terminal device. There is a problem that they cannot fulfill their role. That is, at present, there is a demand for an information reading device as an information portable terminal device capable of immediately displaying the read information on the spot and confirming the read information, but cannot meet this expectation.

At present, an image sensor having two functions, that is, a single panel having a reading element for detecting information and a display element for displaying an image, cannot be easily formed at present, and is thus difficult to use. It is too early to develop a reading device with a display function that applies this panel. In addition, the reading element and the display element are not arranged so as to overlap,
Since the structures are juxtaposed in the plane direction or the perpendicular direction, there is a problem that a large area is required. Further, since the light source required for reading and the backlight required for display have separate structures, they are not suitable for miniaturization and thinning.

Further, in order to apply a small and thin liquid crystal display panel and combine it with a two-dimensional reading sensor, both the liquid crystal display panel for displaying information and the sensor for reading information use light. The challenge is how to effectively use the limited light of the light source. If the light does not easily pass through and becomes weak, the light does not reflect from the original and the detection signal from the sensor panel becomes weak. In addition, there is a problem that the brightness as a backlight of the liquid crystal display panel cannot be secured, and it is difficult to see.

Further, as an information portable terminal device and as an interface of a reading function of an OA device, it has become a major issue how to reduce the power consumption used for reading and how to make the device smaller and thinner.

Therefore, the present invention solves many of these problems, and has a small and thin structure in which reading means and display means are superimposed, and displays and confirms information which is currently read on the spot. It is an object of the present invention to provide an information reading device with a display function that can read while reading. Another object of the present invention is to provide a thinner, smaller, and lower power consumption information reading device by using a device that can display a liquid crystal, which is widely available.

[0018]

According to a first aspect of the present invention, there is provided an information reading apparatus, comprising: a sensor panel comprising a plurality of photovoltaic cells formed in a two-dimensional matrix for reading information of an overlapped original; a liquid crystal display panel for displaying to reproduce the original information read is, the liquid crystal
Position opposite to the sensor panel with respect to the display panel
The liquid crystal display panel and the sensor panel
Transmitting to the a light source which functions as a backlight of the liquid crystal display panel as well as for projecting light to the document on the sensor panel, the liquid crystal display with adhering the liquid crystal display panel with respect to the light source the sensor panel laminated in close contact to the panel, with each of the plurality of photovoltaic cells and each of the plurality of pixels of the liquid crystal display panel in its stacked state the sensor panel is a pair on a one-to-one relationship, and The switching element of the pixel and the photovoltaic cell are at least partially overlapped with each other.

The document information read from the sensor panel can be displayed as it is on the liquid crystal display panel below the sensor panel. In other words, after placing the original on the sensor panel and taking in the information, if the original is removed, the original information is displayed on the LCD panel, and it is as if the original information was It looks like it has been transferred to the sensor panel. Further, a light source, a liquid crystal display panel, and a sensor panel are stacked, and light from a light source as a backlight of the liquid crystal display panel is transmitted through the liquid crystal display panel and the sensor panel to irradiate a document. Therefore, since the light source serving as the backlight of the liquid crystal display panel is also used as the light source of the sensor panel necessary for reading the document information, the thickness can be reduced as compared with the case where each of the light sources is provided. A major feature is that switching elements that are not related to the display itself of the liquid crystal display panel are superimposed on the photovoltaic cell, so that a reduction in the effective display area is suppressed despite the lamination of the liquid crystal display panel and the sensor panel. Can be.

[0020] The information reading apparatus according to claim 2 of the present invention comprises:
In the first aspect, is characterized in that fine positioning unit for finely moving the moving the sensor panel on the liquid crystal display panel independently to the two-dimensional direction with respect to the liquid crystal display panel is disposed. It is necessary to transmit the light from the common light source in the pixel electrode area other than the overlapping portion of the photovoltaic cell and the switching element of the liquid crystal display panel and the sensor panel which are stacked on each other. In the order of μm, the size of the switching element of the liquid crystal display panel and the pixel electrode connected to it are also μm
Due to the order, slight displacement between the two panels makes it difficult for light from the light source to pass through and the light reaching the document is weakened. The displacement between the two panels is caused by the method of lamination and fixing, the aging of the panels, the bending or deformation of the panels, and the like, and appears as a decrease in the detection signal level of the document information and the difficulty in displaying. Therefore, by independently finely moving the sensor panel in the two-dimensional direction with respect to the liquid crystal display panel by the fine movement unit, the detection signal level of the document information can be increased, and the display can be adjusted to be easily viewable. It becomes possible.

When the information reading device is used only for reading the original information and the display is made using an external display device, the sensor panel is finely moved so that the light amount of the light source transmitted through the liquid crystal display panel becomes maximum. Move. Also,
Conversely, when the information reading device is used only for displaying the read information and when reading the original information is not performed, the sensor panel is so arranged that the pixel electrodes of the liquid crystal display panel are not covered by the photovoltaic cells of the sensor panel as much as possible. Move slightly. Thereby, it can be used in the best condition according to the purpose of use.

According to a third aspect of the present invention, there is provided an information reading apparatus,
According to a second aspect of the present invention, the fine moving section for finely moving the sensor panel independently and two-dimensionally with respect to the liquid crystal display panel uses a piezoelectric element. Piezoelectric elements can generate large forces, respond quickly,
The displacement accuracy in the fine movement is high, and the fine movement in the order of μm can be accurately performed. Further, since the piezoelectric element can have a very small structure, the panel surfaces of the sensor panel and the liquid crystal display panel are not blocked.

According to a fourth aspect of the present invention, there is provided an information reading apparatus, comprising:
It consists of a plurality of photovoltaic cells formed in a two-dimensional matrix
A sensor panel for reading the information of the document placed on the upper surface thereof, consist configurations integrating the fine motion portion for finely moving the moving independently of the sensor panel in a two-dimensional direction, the
Mounted on a display device having a light source separate from the device,
When reading the document information by the sensor panel,
The light from the light source passes through the sensor panel and projects the original.
The device itself is characterized by having no light source. Since a display device that has already been used is used as a light source for a sensor panel, the device itself does not need to have a light source, and further reduction in thickness, weight, and power consumption can be achieved.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of an information reading device according to the present invention will be described below in detail with reference to the drawings.

[First Embodiment] FIG. 1 is a block diagram showing a configuration of an information reading apparatus according to the first embodiment. As shown in FIG. 1, the liquid crystal display panel 4 is brought into close contact with the light source 3, and the sensor panel 2 is brought into close contact with the liquid crystal display panel 4 and laminated.
In this configuration, three layers of the liquid crystal display panel 4 and the sensor panel 2 are sandwiched and fixed. An original 1 on which information such as characters and figures are written is placed on the upper surface of the sensor panel 2 with the information written side down. Light source 3
The liquid crystal display panel 4 and the sensor panel 2 have two roles of emitting light to the original 1 on the sensor panel 2 through the transparent portion and emitting light as a backlight of the liquid crystal display panel 4. Image information such as characters and figures is read based on the detection of the reflected light from the original document 1 closely attached to the sensor panel 2, and the liquid crystal display panel 4 displays the image information such as the read characters and figures. I have.

A sensor panel scanning unit 30 that constitutes the sensor panel 2 and scans a plurality of photovoltaic cells arranged in a matrix in a horizontal direction and a vertical direction is connected to the sensor panel 2. Further, a liquid crystal panel scanning unit 35 that scans a plurality of pixels similarly constituting the liquid crystal display panel 4 arranged in a matrix in the horizontal and vertical directions is connected to the liquid crystal display panel 4. Then, the sensor panel scanning unit 30 converts the information read by the sensor panel 2 to the liquid crystal display panel 4 at the same coordinate point.
A scanning switching unit 31 for switching between the sensor panel scanning unit 35 and the liquid crystal panel scanning unit 35 in synchronization with each other is connected to the sensor panel scanning unit 30 and the liquid crystal panel scanning unit 35.

The output of the photovoltaic cell inside the sensor panel 2 is sequentially detected by the signal detecting section 32 by scanning of the sensor panel scanning section 30, and the signal processing section 33 converts the current into a voltage which can be easily processed by current-voltage conversion. It is led to. The converted signal is guided to a display signal generator 34 to further facilitate liquid crystal display, and is converted into, for example, a simple binary signal or data conforming to the Centronics I / F. The display signal generation unit 34 sends a signal to the liquid crystal panel scanning unit 35 while the sensor panel scanning unit 3
0 is sequentially displayed on the liquid crystal display panel 4 in synchronization with 0. That is, the system has a configuration in which information on the document 1 detected by the sensor panel 2 is displayed on the liquid crystal display panel 4.

FIG. 2 shows an exploded perspective view of a laminated structure of the sensor panel 2 having the function of reading information and the liquid crystal display panel 4 having the function of displaying the read information. FIG. 3 is a plan view showing a part of the structure.

The sensor panel 2 includes a transparent substrate 43 such as glass, a plurality of first electrodes 41 formed of a material having high optical transmittance such as ITO on the transparent substrate 43 in a stripe shape, and a transparent substrate 43. An amorphous silicon layer 40 stacked in a stripe shape in a direction orthogonal to the first electrode 41 above;
It is composed of a plurality of second electrodes 42 formed thereon in a stripe shape from a material having low optical transmittance such as nickel. Then, photocells 45 are formed in a matrix at the intersections of the first electrode 41 and the second electrode 42.

The liquid crystal display panel 4 includes a transparent substrate 43a made of glass or the like, transparent pixel electrodes 10 formed in a matrix on the transparent substrate 43a, and connected to each pixel electrode 10 to be arranged in a matrix. And a TFT (thin film transistor) 11.

A plurality of photovoltaic cells 4 in the sensor panel 2
5 and each of the plurality of pixel electrodes 10 in the liquid crystal display panel 4 are configured to overlap one-to-one. A light source 3 used as a backlight of a liquid crystal display panel 4 for emitting light to the document 1 and displaying information of the document 1 is used to securely reach the document 1 as shown in FIG. The light source 3, the liquid crystal display panel 4, and the sensor panel 2 are closely laminated by using the portion 36. The fixing part 36 includes the light source 3 and the liquid crystal display panel 4.
And a fixing member 37 for holding the sensor panel 2 and a fixing screw 38 for pressing the three layers by screwing to bring them into close contact. By laminating the sensor panel 2 and the liquid crystal display panel 4 in this manner, the light 12 from the light source 3 passes through the transparent portion of the liquid crystal display panel 4 including the pixel electrode 10 and the transparent portion of the sensor panel 2. And reaches Document 1.

That is, as shown in FIG. 3, the amorphous silicon 40 which is a part of the sensor panel 2 which does not transmit light and the TFT 11 which is a part which is not related to the display itself of the liquid crystal display panel 4 are overlapped.
The pixel electrode 10 connected to the first electrode 41 overlaps the first electrode 41 having a high light transmittance with as large an area as possible without being hidden by the amorphous silicon 40 as much as possible. As a result, the light 20 emitted from the pixel electrode 10 becomes stronger, the level of the detection signal from the sensor panel 2 can be increased, and the display of the liquid crystal display panel 4 can be made bright and easy to see.

As described above, the sensor panel 2, the liquid crystal display panel 4, and the light source 3, which are closely laminated, are fixed to the fixing portion 36.
By using a sensor panel 2 having a plurality of two-dimensional matrix-shaped photovoltaic cells as the sensor panel 2 and a liquid crystal display panel 4 having a plurality of two-dimensional matrix-shaped pixel electrodes 10, the reading state is improved. And an information reading device having both a reading function and a display function, which can check the information on the spot. The information of the document 1 read from the sensor panel 2 can be displayed on the liquid crystal display panel 4 below the sensor panel 2 as it is. That is, after the original 1 is placed on the sensor panel 2 and the information is taken in, and then the original 1 is removed, the original information is displayed on the liquid crystal display panel 4. Since the liquid crystal display panel 4 and the sensor panel 2 are stacked, it looks as if the document information was transferred to the sensor panel 2.

As described above, the light source 3, the liquid crystal display panel 4, the sensor panel 2
By stacking the document 1 and the document 1 in this order, the information of the document 1 can be detected. In addition, since the light source 3, the liquid crystal display panel 4, the sensor panel 2, and the document 1 are stacked in this order, the following great effects are obtained. That is, as shown in FIGS. 2 and 3, the pixel of the liquid crystal display panel 4 is composed of a transparent pixel electrode 10 and a TFT 11,
The portion T11 is a portion that does not transmit light from the light source 3 and cannot be used as a display. That is, the light 20 from the light source 3
Is transmitted through the pixel electrode 10 but not through the TFT 11.
Therefore, disposing the photovoltaic cell 45 above the TFT 11 necessary for the liquid crystal display has no problem from the viewpoint of the liquid crystal display. TFT1 was not useful for display itself
The light transmission area is as large as possible by stacking the photovoltaic cell 45 on the portion 1.

In the present embodiment, since the electrode width of the first electrode 41 is widened by the method of forming the sensor panel 2, the first electrode 41 is formed at the intersection of the second electrode 42. The area of the photovoltaic cell 45 to be
Is bigger than. Therefore, a part of the pixel electrode 10 is covered by the photovoltaic cell 45.

However, as shown in FIG.
The first electrode 41 and the second electrode 4
The area of the photovoltaic cell 45 formed at the intersection with
And can be almost the same. The photocell 45 does not overlap the pixel electrode 10 at all. Therefore,
The amount of light that passes through the pixel electrode 10 from the light source 3 and reaches the original 1 becomes sufficient. Therefore, the amount of light reflected from the document 1 is large, and the current generated by the photovoltaic cell 45 is also large. If it is still insufficient, the amplifier gain for the output signal of the photovoltaic cell 45 may be increased. Since the sensor panel 2 also transmits light at the pixel electrode 10, information can be viewed without hindering display performance. Further, the photovoltaic cell 45 is closest to the document 1 and can read information on the document 1 without obstructing the reflected light from the document 1.

In the case of FIG. 3, the TFT 11 and the photovoltaic cell 45 do not coincide so as to overlap, but this is for the sake of clarity in the description. desirable.

Hereinafter, the structure of the sensor panel 2 will be described.
This will be described in detail with reference to FIGS.

FIG. 6 is a plan view showing a schematic structure of a sensor panel 2 composed of a plurality of photovoltaic cells arranged in a two-dimensional matrix. FIG. 7 is a sectional view taken along the line AA 'in FIG. 8 is a sectional view taken along line BB 'in FIG. In these figures, 43 is a transparent substrate such as glass,
Reference numeral 41 denotes a plurality of striped first electrodes formed of a material having a high optical transmittance such as ITO on the transparent substrate 43, and further, orthogonal to the first electrodes 41 on the transparent substrate 43. There is an amorphous silicon layer 40 stacked in a stripe shape in the direction, and a plurality of striped second electrodes 42 formed of a material having low optical transmittance such as nickel on the striped amorphous silicon layer 40. . Further, terminal portions 44a,
44b are formed.

As shown in FIG. 7, in the section taken along the line AA ', a first electrode 41, an amorphous silicon layer 40, and a second electrode 42 are laminated from the transparent substrate 43 side. As a result, the photovoltaic cells 4 are arranged in a two-dimensional matrix at a point a where the first electrode 41 and the second electrode 42 intersect.
5 is formed. In FIG. 6, the positions of the pixel electrode 10 and the TFT 11 when the liquid crystal display panel 4 is overlaid on the sensor panel 2 are indicated by broken lines.

As shown in FIG. 8, only a transparent substrate 43 and a first electrode 41 made of a material having a high optical transmittance exist at a location b, which is a cross section of BB '. Therefore, it can be seen that the optical transmittance of the portion b is higher than that of the portion a which is the AA 'cross section. When the first electrode 41 is made of a transparent material such as ITO, the light transmittance can be about 80%. When a glass substrate is used as the transparent substrate 43, the light transmittance is about 95%.
The light transmittance at the point b can be about 75%.

Therefore, light incident on the transparent substrate 43 like the incident light X shown in FIG. 8 passes through the portion shown by b in FIG. 6, that is, the transparent substrate 43 and the first electrode 41, and is transmitted to the back surface. I do. Conversely, like the incident light Y shown in FIG.
The light incident on 1 passes through the first electrode 41 and the transparent substrate 43 and is transmitted to the surface. That is, the light transmittance at the point b is sufficiently high.

On the other hand, at the position a shown in FIG. 6, ie, the first electrode 41, the amorphous silicon layer 40 and the second electrode 4
The light incident on the portion where 2 overlaps with X is indicated by X in FIG.
Irrespective of whether the light is incident from the direction or the direction of Y, the light is not transmitted to the opposite surface. This is because it is shielded by the second electrode 42 having a low optical transmittance.

With the above configuration, at the intersection of the first electrode 41 and the second electrode 42 indicated by a, the photovoltaic cell 45
Are formed in a two-dimensional matrix.

The amorphous silicon layer 40 has a very low electric conductivity in the lateral direction. Therefore, even when the amorphous silicon layers are connected, the photovoltaic cell 45 is formed only at the point a where the first electrode 41 and the second electrode 42 intersect. Leaks are extremely low. Depending on the viewpoint, it may be considered as a completely separated photovoltaic cell.

Although not particularly mentioned above, a method for forming each electrode and an amorphous silicon layer on a transparent substrate is to form a thin film by using a CVD apparatus or the like and then to perform etching by an appropriate method. . The amorphous silicon layer is formed on the first electrode in the order of a p-type semiconductor, an insulating layer, and an n-type semiconductor, or an n-type semiconductor, an insulating layer,
A p-type semiconductor is formed on the first electrode in this order. There is no functional difference in either case, that is, the first electrode and the second electrode
A photovoltaic cell may be formed at the intersection of the electrodes.

Needless to say, the sensor panel 2 shown in FIG. 6 does not depend on the number of photocells formed in a matrix. The number may be four as used in the illustration, or may be as large as 10,000 or more.

Further, as shown in FIG. 7, since there is a difference in light transmittance between the first electrode 41 and the second electrode 42, the light is incident from the surface where the second electrode 42 having a low light transmittance exists. The photovoltaic cell 45 does not respond to the light, while the photovoltaic cell 45 responds only to the light incident from the surface 50 of the transparent substrate 43 on the side where the first electrode 41 with high light transmittance is present to generate a photoelectromotive force. I do.

Here, the manner of reading information will be described with reference to FIG. FIG. 9 is a cross-sectional view taken along line CC ′ of FIG.

At the time of reading information, the original 1 is brought into close contact with the surface of the transparent substrate 43. This original 1 has, for example, ink 1
Assume that information is written by 90. Although the portions a and b in FIG. 9 are also described in FIG. 6, the portion a does not transmit light and the portion b transmits light. Then, when light A and light B are incident from the surface opposite to the surface on which the original 1 is in close contact, the incident light is applied to the first electrode 41 and the transparent substrate 4 at the portion b of the sensor panel 2.
3 and is reflected by the original 1. At this time, the light a incident on the portion of the document 1 where the character or graphic information is written with the ink 190 is absorbed by the ink 190, and therefore, the reflection is weak and there is almost no reflected light. On the other hand, manuscript 1
The light b incident on the part where nothing is written gives strong reflected light c. If the intensity of the light is converted into a current by the photovoltaic power of the photovoltaic cell, the information written on the document 1 can be read.

As described above, the light source 3, the liquid crystal display panel 4, and the sensor panel 2 are closely adhered to each other by the fixing portion 36 while maintaining the positional relationship between the photovoltaic cell 45 and the TFT 11 so that the light from the light source 3 is transmitted to the original 1 strongly. By doing so, an easy-to-read information reading device with a large detection signal and a bright display is realized. This information reading device has a function of reading information of the document 1 by the sensor panel 2 and a function of displaying the information read by the liquid crystal display panel 4, and uses a common light source 3 for scanning while synchronizing the two. Therefore, the thickness can be reduced.

[Second Embodiment] In the first embodiment, the light source 3, the liquid crystal display panel 4, and the sensor panel 2
Must be stacked in close contact with each other, and light from the light source 3 needs to be transmitted through the liquid crystal display panel 4 and the sensor panel 2. However, the size of the photovoltaic cell 45 in the sensor panel 2 is on the order of μm, and the size of the TFT 11 and the pixel electrode 10 connected to the TFT 11 in the liquid crystal display panel 4 is very small on the order of μm.
If the positional relationship between the liquid crystal display panel 4 and the sensor panel 2 is slightly deviated, the light from the light source 3 is hardly transmitted, and a problem that the light reaching the document 1 is weakened occurs. This can also be understood from the fact that the area of the amorphous silicon layer 40 that does not transmit light covers the transparent pixel electrode 10 is increased, so that the transmitted light 20 is reduced.

Such a shift between the two panels is caused by a method of lamination and fixing, a change with time of the panel, a bending or deformation of the panel, and the like, and a decrease in the amount of transmitted light from the sensor panel 2 causes the shift from the sensor panel 2. This may cause a decrease in the detection signal of the document information and make it difficult to see the display on the liquid crystal display panel 4.

Therefore, the second embodiment was created to solve the above problem. This will be described below.

FIG. 10 shows the sensor panel 2 in the X-axis direction 80 in a two-dimensional area above the liquid crystal display panel 4.
This shows that the apparatus is configured to be finely moved by sliding in the x and Y axis directions 80y. Above the transparent pixel electrode 10, the opaque photovoltaic cell 45 is adjusted by fine movement of the sensor panel 2 so as not to cover the pixel electrode 10 as much as possible and to be located in the immediate vicinity of the TFT 11. FIGS. 11 and 12 show the configuration of the fine movement unit 60 for enabling such adjustment as required. FIG. 11 is a schematic plan view of the fine movement unit 60, and FIG. 12 is a schematic side view of the fine movement unit 60.

The fine movement section 60 includes four fixed sections 61, 62, 63, 64 fixed to the upper surface of the liquid crystal display panel 4.
And two fixing parts 65 and 66 fixed to two places of the sensor panel 2, a moving part 67 disposed between the fixing part 61 and the fixing part 62, and a part between the moving part 67 and the fixing part 61. , A second piezoelectric element 69 interposed between the moving part 67 and the fixed part 62, and a moving part disposed between the fixed part 63 and the fixed part 64. 70, a third piezoelectric element 71 interposed between the moving part 70 and the fixed part 63, a fourth piezoelectric element 72 interposed between the moving part 70 and the fixed part 64, and a moving part 67. The fifth piezoelectric element 73 is interposed between the moving part 70 and the fixed part 66, and the sixth piezoelectric element 74 is interposed between the moving part 70 and the fixed part 66. In FIG. 12, 2 is a sensor panel, 3 is a light source, and 4 is a liquid crystal display panel. The first to fourth piezoelectric elements 68, 69, 71, 72 constitute an X-direction fine movement section 60a along the X-axis direction 80x.
And the sixth piezoelectric elements 73 and 74, in the Y-axis direction 80y.
, A Y-direction fine movement unit 60b is formed.

Next, the operation of the piezoelectric element constituting each fine movement section will be described with reference to FIGS. A piezoelectric element is an element that can reversibly convert electric energy and mechanical energy. This element exhibits a positive piezoelectric effect in which an electric field is generated in proportion to the stress when a mechanical stress is applied, and an inverse piezoelectric effect in which a distortion is generated in proportion to the electric field when an electric field is applied. This element structure is made of ceramics which have been subjected to an operation (polarization treatment) of applying an electric field of a certain value or more from the outside and inverting the domains so as to form a single domain crystal structure having all the crystal axes aligned. Polarized piezoelectric ceramics exhibit a piezoelectric effect in response to external energy. Note that the piezoelectric effect does not occur unless the domains are aligned by polarization. When polarized, unlike the unpolarized one, a large distortion occurs in the polarization direction, and this distortion exhibits an inverse piezoelectric effect in response to an external electric field. The effects mainly include a longitudinal effect (piezoelectric constant d ₃₃ ) in which the electrode direction and the stretching strain direction are the same, and a lateral effect (piezoelectric constant d ₃₁ ) in which the electrode direction and the stretching strain direction are perpendicular. The relationship between the direction of the applied voltage and the direction of expansion / contraction depends on whether the design uses the vertical effect or the horizontal effect.

The actual expansion / contraction operation will be described in detail with reference to FIG. FIG. 13 shows a state in which a voltage is applied to the piezoelectric element 90 of the fine movement unit designed for the lateral effect. 91 is a polarization electrode, and 92 is a DC power supply. DC power supply 9 for polarized electrode 91
When a voltage more positive than 2 is applied, the piezoelectric element 90 tends to expand in the polarization direction due to the lateral effect, and consequently contracts in the vertical direction (see arrows). That is, in FIG. 14, the state where the piezoelectric element 90 is contracted is 90a. Next, when a negative voltage is applied from the DC power supply 92 to the polarization electrode 91 of the piezoelectric element 90, the piezoelectric element 90
Tries to shrink in the polarization direction and consequently expands in the vertical direction. In FIG. 14, the state where the piezoelectric element 90 is extended is 90b.

FIG. 15 shows a state corresponding to FIG. When finely moving the sensor panel 2 rightward along the X-axis direction 80x, the moving parts 67 and 70 may be finely moved in the same direction. In this case, the first piezoelectric element 68 and the third
The second piezoelectric element 69 and the fourth piezoelectric element 72 may be contracted at the same time as the piezoelectric element 71 is extended. Conversely, when the sensor panel 2 is finely moved to the left along the X-axis direction 80x, the moving parts 67 and 70 may be finely moved in the same direction. Third
The second piezoelectric element 69 and the fourth piezoelectric element 72 may be extended at the same time as the piezoelectric element 71 is contracted. Further, when the sensor panel 2 is slightly moved in the opposite direction along the Y-axis direction 80y, the fifth piezoelectric element 73 may be contracted and the sixth piezoelectric element 74 may be extended at the same time. To slightly move the piezoelectric element to the side, the sixth piezoelectric element 74 may be contracted at the same time as the fifth piezoelectric element 73 is extended. As described above, the sensor panel 2 is finely moved left and right with respect to the liquid crystal display panel 4 along the X axis direction 80x, finely moved back and forth along the Y axis direction 80y, or a combination of both. It is possible to arbitrarily make fine movements in the dimension direction. The fixing portions 61 to 64 are fixed so as not to move with respect to the liquid crystal display panel 4.

In FIG. 12, the fixed parts 61 and 62, the moving part 67, and the piezoelectric elements 68 and 69 are shown very large as compared with the sensor panel 2, but this is easily understood in the description. Because the piezoelectric element and the like are very small, there is no problem such as protruding in the appearance of the embodiment.

As described above, it is possible to provide an information reading device in which the sensor panel can be finely moved by voltage input.

FIG. 16 is a circuit diagram showing a configuration of the fine movement unit driving unit 100 for driving the fine movement units 60a and 60b.
In FIG. 16, 101 is a voltage controlled oscillator, 102 is a start / stop switch, 103 is an up / down switch, 104 to 107 are NAND gates, 108 and 109 are up / down binary counters,
110 is a latch circuit, 111 is an 8-bit ladder resistor,
112 is a variable resistor, 113 is an amplifier, 114 is an inverter, and 115 and 116 are output terminals. Assuming that this fine movement unit driving unit 100 is for the first fine movement unit 60a, one output terminal 115 is connected to the first piezoelectric element 68 and the third
The other output terminal 116 is connected to the second piezoelectric element 69 and the fourth piezoelectric element 72.

FIG. 17 shows the waveform of the sawtooth fine-movement-part driving signal S ₁ output from the amplifier 113. start/
With the stop switch 102 switched to the “H” side, the up / down switch 103 is set to “L”.
, The fine-movement-part drive signal S ₁ has a sawtooth waveform that gradually falls as shown in FIG.
When the up side of the down changeover switch 103 "H", the fine motion portion drive signals S ₁ becomes gradually rises sawtooth waveform as. Further, when switched to the switch 102 "L" side for start / stop, latch acts to latch-circuit 110, the fine motion portion drive signals S ₁ keeps a constant value as the level at that time. That is, the waveform of the fine movement unit drive signal S ₁ in FIG. 17 shows a waveform when the best positional relationship between the sensor panel 2 and the liquid crystal display panel 4 is being searched.
The operation of the switches 102 and 103 is manually performed, and the quality of the relative positional relationship between the sensor panel 2 and the liquid crystal display panel 4 is visually determined.

When the fine movement section drive signal S ₁ is in the decreasing state, the first piezoelectric element 68 and the third piezoelectric element 71 are extended, and simultaneously, the second piezoelectric element 69 and the fourth piezoelectric element 72 are contracted. Then, the sensor panel 2 moves to the right along the X-axis direction 80x. When in the increasing state of the fine movement unit drive signals S ₁ includes a first piezoelectric element 68 a third piezoelectric element 71 is contracted, at the same time as the second piezoelectric element 69 fourth piezoelectric element 72
Extends, and the sensor panel 2 moves to the left. By operating the switches 102 and 103, the X-axis direction 80
sensor panel 2 for liquid crystal display panel 4 at x
By setting the switch 102 to the "L" side in a state where the positional relationship of "1" is best, the fine movement unit drive signal S1 is held in the state of "_1" .

One output terminal of the fine movement unit driving unit having the same configuration as the fine movement unit driving unit 100 is connected to the fifth piezoelectric element 7.
3 and the other output terminal is connected to the sixth piezoelectric element 74. In this case, when the fine movement unit drive signal S ₁ is in the decreasing state, the fifth piezoelectric element 73 expands, and at the same time, the sixth piezoelectric element 74 contracts, and the sensor panel 2 becomes Y
It moves to the near side along the axial direction 80y. When the fine movement unit drive signal S ₁ is in the increasing state, the fifth piezoelectric element 7
3 contracts, and at the same time, the sixth piezoelectric element 74 expands, and the sensor panel 2 moves to the back side. Such a switch 10
The state of the fine motion portion driving signals S ₁ by the switch 102 "L" side in a state where the positional relationship of the sensor panel 2 with respect to the liquid crystal display panel 4 in the Y-axis direction 80y becomes best by the operation of 2,103 Hold.

By the above adjustment, the positional relationship of the sensor panel 2 with respect to the liquid crystal display panel 4 in the two-dimensional direction can be made the best. Generally, the level of the detection signal from the sensor panel 2 becomes maximum, and the light source 3
Is adjusted so that the light from the display does not hinder the display on the liquid crystal display panel 4 and a clear display state appears.

As another embodiment, an output value when the positional relationship of the sensor panel 2 with respect to the liquid crystal display panel 4 at the time of the above adjustment becomes the best is stored, and a voltage based on the output value is always stored. A configuration in which the voltage is applied to the fine movement units 60a and 60b is also conceivable. As a storage method, for example, as a simple example, a resistor trimmer may be used to adjust the output of a sawtooth waveform, and the voltage may be fixed at a necessary voltage value. Alternatively, a sawtooth waveform based on a digital signal may be applied and fixed to the memory at a required voltage value. Either method may be used, but a voltage is applied to the fine movement unit so that the level of the detection signal from the sensor panel 2 becomes maximum and the light from the light source 3 moves to a position that does not hinder the display on the liquid crystal display panel 4. To be configured.

FIG. 18 shows an example of the storage means. FIG. 18 shows the NAND gates 105 and 10 of FIG.
7 shows a portion interposed between the output terminal 7 and the input terminal of the ladder resistor 111. Up / down counter A memory 117 in which each input terminal is connected to each output terminal of the binary counters 108 and 109 is provided, and an output switching unit 118 that switches between the output of the latch circuit 110 and the output of the memory 117 and outputs the output to the ladder resistor 111 in the subsequent stage. Is provided. The memory 117 stores output data from the up / down counter binary counters 108 and 109 when the positional relationship of the sensor panel 2 with respect to the liquid crystal display panel 4 becomes the best during the above adjustment. Then, if necessary, the optimum condition command is given to the memory 117 and also to the output switching unit 118 so that the output switching unit 11
8 is connected to the memory 117 and the data stored in the memory 117 is applied to the ladder resistor 111 at the subsequent stage via the output switching unit 118 to visually check the positional relationship of the sensor panel 2 with respect to the liquid crystal display panel 4. Thus, the best state of the past can be immediately reproduced even during the adjustment.

As still another embodiment, when the original 1 is read by the sensor panel 2 and when the read information is displayed on the liquid crystal display panel 4,
The positional relationship between the sensor panel 2 and the liquid crystal display panel 4 may be changed. In other words, it may be configured to move to a position where the detection signal of the document information is in a good state at the time of reading, and to a position where the user can view it most easily when displaying after reading. Each time, the sensor panel 2 is finely moved with respect to the liquid crystal display panel 4 by the fine movement units 60a and 60b so as to function at the best position.

Further, when the information reading device mainly reads information and displays the read information using an external display device, the liquid crystal display panel 4 is used.
May be disregarded and the sensor panel 2 may be finely moved so that the detection signal level of the document information by the sensor panel 2 becomes maximum.

On the other hand, when the information reading device mainly uses the display of information (information reading is performed from an external information device via a cable), the pixel electrode 10 of the liquid crystal display panel 4 is connected to the sensor. The sensor panel 2 is slightly moved so as not to be covered by the photovoltaic cell 45 of the panel 2 as much as possible. For example, as shown in FIG. 5, it is possible to adjust the TFT 11 so that the entirety of the TFT 11 is covered by the photovoltaic cell 45 so that there is almost no influence on the display.

As described above, it is possible to configure an information reading device that can be used in the best condition according to the purpose of use.

Here, the case of FIG. 3 will be described. Although the TFT 11 and the photovoltaic cell 45 are partially displaced, the fine movement by the fine movement units 60a and 60b causes the TF
It is also possible to adjust so that the overlapping range between T11 and the photovoltaic cell 45 is further increased. In the case of FIG. 3, this can be realized by moving the photovoltaic cell 45 in the upper left direction where the TFT 11 is located.

The photovoltaic cell 4 in the sensor panel 2
By moving the sensor panel 2 so as to cover the pixel electrodes 10 of the liquid crystal display panel 4, the sensor panel 2 can be used as a pixel shutter of the liquid crystal display panel 4. That is, the sensor panel 2 is moved to adjust the brightness of the liquid crystal display panel 4.

[Embodiment 3] A semi-fixed embodiment 3 with a very simple structure will be described in relation to the fine movement of the sensor panel described in the embodiment 2.

As shown in FIG. 19, the light source 3, the liquid crystal display panel 4, and the sensor panel 2 are tightly sandwiched by a fixing member 120 in a stacked state, and are fixed by screws 121. A cushion member 122 is provided inside the fixing member 120 on the lateral side of the sensor panel 2, and the screw 1
By rotating the horizontal screw 123 on the opposite side to the cushion material with the 21 loosened, the elastic force of the cushion material or by the elastic force of the cushion material is rotated.
The sensor panel 2 can be finely moved rightward or leftward. It is assumed that a similar structure is employed in the orthogonal direction.

In the case of the third embodiment, although fine adjustment is not possible as compared with the piezoelectric element, there is an advantage that the cost can be suppressed very low.

[Fourth Embodiment] As a further modified embodiment, an information reading apparatus having a structure in which the light source 3 is omitted will be described. This is a read-only information reading device having no display function, in which the liquid crystal display panel 4 is also omitted.
In the fourth embodiment, light from a display device such as a personal computer or an electronic organizer that the user already owns is used as light for illuminating a document. However, it is necessary to perform fine movement each time so that light can be transmitted effectively. FIG. 20 shows a schematic configuration of the information reading apparatus thus configured.

In FIG. 20, reference numeral 2 denotes a sensor panel for reading the information of the original 1 on which the original 1 is placed. The sensor panel 2 has the same X-axis direction 80x as described in the second embodiment. A fine movement section 140a and a fine movement section 140b (not shown) in the Y-axis direction 80y are provided, and each of the fine movement sections 140a and 140b generates a sawtooth waveform similar to that shown in FIG. 16 or FIG. The fine moving section driving sections 141a and 141b are connected. Fine movement units 140a and 140b are provided on a frame (not shown) that holds sensor panel 2 slidably. 142, a control unit that operates the sensor panel 2 to pick up document information read by the sensor panel 2;
143 is a signal detection unit, 144 is a signal processing unit, 145 is a separate information processing device such as a personal computer or electronic notebook,
146 is the liquid crystal display panel, and 147 is a backlight.

At the time of reading the document information, the sensor panel 2 on which the fine movement units 140a and 140b are integrated is placed on the liquid crystal display panel 146 of the information processing device 145, and the document 1 is placed on the sensor panel 2. Information processing device 14
5 from the backlight 147 of the LCD panel 14
6 through the sensor panel 2 and the original 1
The document information is read into the sensor panel 2 by detecting the reflected light from the document 1 by the photovoltaic cell 45, and the control unit 142, the signal detection unit 143, and the signal processing unit 14
4, the liquid crystal display panel 146 of the information processing device 145.
To be displayed. At this time, fine movement unit driving units 141a and 141
b, the fine movement units 140a and 140b are driven to move the sensor panel 2 relative to the liquid crystal display panel 146 in the X-axis direction 8.
Fine adjustment is performed between 0x and the Y-axis direction 80y, so that the light from the liquid crystal display panel 146 is adjusted so as to irradiate the document 1 most efficiently. At this time, it is also important to take care to make the display state on the liquid crystal display panel 146 as clear as possible.

The state of the output signal from the sensor panel 2 changes depending on the state of the information written on the document 1 and the light amount of the backlight 147. Further, the sharpness of the display on the liquid crystal display panel 146 varies depending on the viewing angle, and also varies depending on the environmental conditions used. It also depends on user preferences. Of course, if the information processing device 145 is changed, the positional relationship with the sensor panel 2 needs to be readjusted. Therefore, in each case, it is preferable that the sensor panel 2 be finely movable in two-dimensional directions in order to realize the best positional relationship.

In the case of the fourth embodiment, the backlight 147 of the information processing device 145, which is currently widely used, is used as a light source, and the liquid crystal display panel 146 of the information processing device 145 itself is used as a display unit. With this configuration, the light source 3 and the liquid crystal display panel 4 can be omitted from the information reading device itself, and furthermore, it is possible to reduce the thickness, weight, power consumption, and cost.

[0083]

According to the information reading apparatus of the first aspect of the present invention, the document information read from the sensor panel can be displayed as it is on the liquid crystal display panel below the sensor panel. In other words, if you place the original on the sensor panel and capture the information, and then remove the original, the original information is displayed on the LCD panel, and because the LCD panel and sensor panel are stacked, the original information is It can be read and displayed as if it were copied on the spot.
Further, a light source, a liquid crystal display panel, and a sensor panel are stacked, and light from a light source as a backlight of the liquid crystal display panel is transmitted through the liquid crystal display panel and the sensor panel to irradiate a document. Since the light source, which is the backlight of the liquid crystal display panel, is also used as the light source of the sensor panel necessary for reading the document information,
The thickness can be reduced as compared with the case where each of them has a light source. A major feature is that switching elements that are not related to the display itself of the liquid crystal display panel are superimposed on the photovoltaic cell, so that a reduction in the effective display area is suppressed despite the lamination of the liquid crystal display panel and the sensor panel. Can be.

According to the information reading device of the second aspect of the present invention, the relative positional relationship between the photocell on the sensor panel and the switching element on the liquid crystal display panel is made independent in two-dimensional directions by the fine movement by the fine movement unit. It is possible to make fine adjustments by adjusting the stacking of the two panels, and even if the two panels are displaced due to the aging of the panels, bending or deformation of the panels, etc. By making the amount of light transmitted through the two panels sufficient, the detection signal level of the document information can be increased, and the display of the read document information can be easily viewed. When the information reading device is used only for reading document information and an external display device is used for display, the sensor panel is finely moved so that the light amount of the light source transmitted through the liquid crystal display panel is maximized. Conversely, when the information reading device is used only for displaying the read information and when reading the original information is not performed, the sensor is arranged so that the pixel electrodes of the liquid crystal display panel are not covered with the photovoltaic cells of the sensor panel as much as possible. Move the panel slightly. Thereby, it can be used in the best condition according to the purpose of use.

According to the information reading device of claim 3 of the present invention, the fine movement section is constituted by a piezoelectric element, and the piezoelectric element
Even in a small design, a large force can be generated, the response is fast, the displacement accuracy in the fine movement is high, and the fine movement on the order of μm can be accurately performed. Since the amount of fine movement of the piezoelectric element can be designed by calculation, it can be accurately controlled by changing the voltage value. Further, since the piezoelectric element can have a very small structure, the panel surfaces of the sensor panel and the liquid crystal display panel are not blocked.

According to the information reading device of the fourth aspect of the present invention, since the light of the external display device is used as a light source for reading the document information by the sensor panel, the information reading device itself is used. Need not have a light source, and can be made thinner, lighter, and lower in power consumption. Further, the fine movement by the fine movement section can sufficiently increase the amount of light passing through the sensor panel and reaching the document.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an information reading device according to Embodiment 1 of the present invention.

FIG. 2 is an exploded perspective view showing a laminated structure of a sensor panel and a liquid crystal display panel in Embodiment 1.

FIG. 3 is a plan view showing a part of a laminated structure of the sensor panel and the liquid crystal display panel in the first embodiment.

FIG. 4 is a side view showing a structure for tightly laminating a light source, a liquid crystal display panel, and a sensor panel in the first embodiment.

FIG. 5 is a plan view showing an ideal state of overlapping of a photovoltaic cell and a TFT in the first embodiment.

FIG. 6 is a plan view showing a schematic structure of a sensor panel including a plurality of photovoltaic cells arranged in a two-dimensional matrix.

7 is a sectional view taken along the line AA 'in FIG.

FIG. 8 is a sectional view taken along line BB ′ in FIG.

9 is a sectional view taken along line CC ′ in FIG. 6;

FIG. 10 is an exploded perspective view illustrating a two-dimensional fine movement of a sensor panel with respect to a liquid crystal display panel in the information reading device according to the second embodiment of the present invention.

FIG. 11 is a schematic plan view showing a configuration of a fine movement section of a sensor panel according to the second embodiment.

FIG. 12 is a schematic side view showing a configuration of a fine movement section of a sensor panel according to the second embodiment.

FIG. 13 is an operation principle diagram of the piezoelectric element used in the second embodiment.

FIG. 14 is a diagram showing an operation state of a piezoelectric element used in the second embodiment.

FIG. 15 is a diagram showing an operation state of a fine movement unit using a piezoelectric element in the second embodiment.

FIG. 16 is a circuit diagram showing a configuration of a fine movement unit driving unit according to the second embodiment.

FIG. 17 is a waveform diagram of a fine movement unit drive signal output from a fine movement unit drive unit according to the second embodiment.

FIG. 18 is a circuit diagram showing another configuration of the fine movement unit driving unit according to the second embodiment.

FIG. 19 is a side view showing a configuration of a semi-fixed type fine movement unit in the information reading device according to the third embodiment of the present invention.

FIG. 20 is a block diagram showing a configuration of an information reading device according to a fourth embodiment of the present invention.

FIG. 21 is a plan view schematically showing a coordinate input device according to a conventional technique.

FIG. 22 is a plan view schematically showing a two-dimensional photodiode according to a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Original document 2 ... Sensor panel 3 ... Light source 4 ... Liquid crystal display panel 10 ... Pixel electrode 11 ... TFT 36 ... Fixed part 40 ... Amorphous silicon layer 41 ... First electrode 42 ... First 2 electrode 43... Transparent substrate 43a... Transparent substrate 45... Photovoltaic cell 60... Fine movement part 60a... X direction fine movement part 60b. 2 piezoelectric element 70 moving section 71 third piezoelectric element 72 fourth piezoelectric element 73 fifth piezoelectric element 74 sixth piezoelectric element 100 fine moving section driving section 117 ... Memory 140a Fine-movement section 141a Fine-movement section driving section 145 External information processing device 146 Liquid crystal display panel 147 Backlight

Claims (4)

(57) [Claims] A sensor panel 1. A reading information becomes superimposed document from a two-dimensional matrix to form a plurality of photovoltaic cells, and a liquid crystal display panel for displaying to reproduce the original information the sensor panel has read the LCD table
Display panel in the opposite direction to the sensor panel.
Disposed, the liquid crystal display panel and the sensor panel
A light source that transmits light to project the light on the original on the sensor panel and that functions as a backlight of the liquid crystal display panel.
Laminated in close contact with the sensor panel to the liquid crystal display panel with adhering the display panel, with each of the plurality of photovoltaic cells and each of the plurality of pixels of the liquid crystal display panel in its stacked state the sensor panel 1 One to one
Wherein the switching element of the pixel and the photovoltaic cell are at least partially overlapped with each other. 2. The liquid crystal display panel according to claim 1, further comprising : a fine movement unit configured to finely move the sensor panel independently and two-dimensionally with respect to the liquid crystal display panel on the liquid crystal display panel. Information reading device. 3. A process according to claim, wherein the fine <br/> moving unit finely moving move independently in a two-dimensional direction of the sensor panel to the liquid crystal display panel is obtained by using a piezoelectric element 2. The information reading device according to 2. 4. A sensor panel comprising a plurality of photovoltaic cells formed in a two-dimensional matrix and reading information on an original placed on the upper surface thereof, and a fine moving unit for finely moving the sensor panel independently in a two-dimensional direction. And a display device having a light source separate from the device.
The original information is read by the sensor panel
When removing, the light from the light source passes through the sensor panel.
An information reading apparatus characterized in that an original is not projected and the apparatus itself does not have a light source.