JPH11187211A - Information reader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small, thin and low power consumption type information reader provided with a display function that read information can be viewed simultaneously, for example, in the feeling that original information is projected on the mirror. SOLUTION: In this information reader has a sensor panel 2 which includes plural photocells 45 and reads information on a recording medium, a liquid crystal display panel 4 which has a TFT 11 and a pixel electrode 14 and reproduces and shows information that is read by the panel 2 and a light source as back light for the liquid crystal display panel, the surface area of the photocells 45 is almost the same as that of the TFT 11 and the photocells and the TFT are arranged at such a place that they mutually overlap.

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 information such as characters and figures are written, and more particularly to an apparatus for use 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. An information reading apparatus using a photocell as a photosensitive element member is known as an information reading apparatus including a scanning unit for moving the photoelectric conversion device in a direction in which the photoelectric conversion device moves, and a data processing unit for transmitting an output electric signal of the photoelectric converter as a serial signal.

The present applicant has previously proposed a technique relating to such an information reading apparatus (Japanese Patent Application No. 8-134658).
issue). This technical content will be described with reference to FIG.

As shown, a photovoltaic cell 45 is formed on the sensor panel 2. The sensor panel 2 is formed by stacking a stripe-shaped first electrode 41, an amorphous silicon layer 40, and a stripe-shaped second electrode 42 on a transparent substrate 43 in this order. And where the amorphous silicon layer 40 is formed at the intersection of the second electrode 42.

[0005]

In order to apply a small and thin liquid crystal display panel and superimpose it on a two-dimensional reading sensor, it is necessary to make effective use of light limited by a light source. This is because both the liquid crystal display panel for displaying information and the sensor for reading information use light.

[0006] When light is difficult to transmit and the amount of light is weak,
The illuminance of the light reflected from the document is reduced, and the detection signal from the sensor panel is weakened. 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, since the light receiving elements are formed with light receiving elements corresponding to the number of display function elements for displaying information or the like, the light receiving elements become elements having a very small light receiving area, and a signal output upon receiving light is inevitably reduced. Therefore, it is an issue how to output a very small output signal, which is unavoidable due to its structure, in a noise-free state. In particular, for a light receiving element, a decrease in the amount of light is a decrease in an output signal, and how to utilize light effectively becomes an issue.

Further, as a portable device and an interface of a reading function of a 0A device, how to reduce the power consumption used for reading and how to make the device small and thin have become a major issue.

In the technique disclosed in FIG. 16, in the light receiving portion, the first and second electrodes 41 and 42 are further provided on the transparent substrate 43.
Since 42 occupies a large space, it cannot be said that the light receiving efficiency is good.

An object of the present invention is to solve the above-mentioned problems and to provide an information reading apparatus in which a panel having a display function and a panel having a reading function are stacked.

In particular, it is an object of the present invention to provide a small and thin information reading apparatus having a display function that allows reading information to be viewed on the spot, for example, such that original information is projected onto a mirror.

Another object of the present invention is to provide a low-power-consumption information reading device that can read data by using a very large number of liquid crystal display panels that can be used as they are.

[0013]

Means for Solving the Problems A sensor panel including a plurality of photovoltaic cells and having a TFT and a pixel electrode for reading information on a recording medium, and reproducing and displaying the information read by the sensor panel. In an information reading apparatus including a liquid crystal display panel and a light source as a backlight of the liquid crystal display panel, the photocell has a surface area of the TF.
T is substantially the same as the surface area of the photovoltaic cell and the TFT.
Are arranged so as to overlap each other.

The sensor panel includes a transparent substrate, a first electrode and a second electrode formed on the transparent substrate, and amorphous silicon.
The first and second electrodes and the amorphous silicon are laminated, and the first and second electrodes are in a stripe shape, and the first and second electrodes are formed in a portion other than the photovoltaic cell forming portion. Is characterized in that its line width is formed narrower than that formed in the photovoltaic cell forming portion.

An information reading apparatus for reflecting light on an original on which image information such as characters and figures are written, and obtaining information by detecting the reflected light, wherein a plurality of information reading apparatuses formed in a two-dimensional matrix. A sensor panel consisting of a photocell, a liquid crystal display panel that reproduces and displays information written on the original, and irradiates light to the original that is in close contact with the sensor panel, and as a display backlight for the liquid crystal display panel A light source unit to be used; a unit that scans a plurality of photocells of the sensor panel; and a scan control unit that controls a unit that scans a plurality of pixels of the liquid crystal display panel, wherein the control unit is necessary for reading information. One of the XY-axis scans on the original, one line of the sensor panel performs the line scan with the photovoltaic cell in the ON state, and the other scan performs the scan of the liquid crystal display panel. 1 line Le is a means for performing the line scanning in a state where the light of the light source to pass through, the photocell ON state for one line, light source light for one line, characterized in that the read information of the intersection of the transmission state.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An information reading device according to the present invention will be described below with reference to the drawings. The feature technology of the present application is a portion relating to the configuration of the sensor panel and the liquid crystal display panel, and this portion will be particularly described in detail. The other configuration is the same as that described in Japanese Patent Application No. 8-134658, and will not be described here.

[Embodiment 1] FIG. 1 is an explanatory view of the positional relationship between a sensor panel and a liquid crystal display panel in the information reading apparatus of the present invention. FIG. 3A is a view from the top, and FIG. 3B is a view from the perspective direction.

The difference from the conventional structure is that the first electrode 41 and the second electrode 42 in a stripe shape are formed on the transparent substrate 43 so as not to obstruct the light passing portion of the pixel electrode 10. It is.

That is, the surface area of the photovoltaic cell 45 is
1, the photovoltaic cell 45 and the TFT 11
Are arranged so as to overlap each other, and the first and second electrodes 41 and 42 formed in portions other than the photovoltaic cell 45 forming portion, that is, portions in the liquid crystal display panel 4 where the pixel electrodes 10 are located. Has a line width smaller than that formed in the photovoltaic cell 45 forming portion.

This will be further described with reference to FIG. 2 which is an enlarged view of a portion where the photovoltaic cell 45 is formed. The photovoltaic cell 45 is the pixel 11
(A) and (b) of FIG.

As a result, the space occupied by the first and second electrode portions 41 and 42 on the transparent substrate can be greatly reduced, and as a result, an information reading portion excellent in light receiving efficiency can be realized.

[Embodiment 2] In the sensor panel, a plurality of photovoltaic cells are formed, but the characteristics of the formed photovoltaic cells vary.

FIG. 3 shows the characteristics of the photovoltaic cell. The drawing shows a change in an output signal depending on the illuminance of light. This indicates that the output signal can be controlled by controlling the light of the light source.

The light from the light source passes through the pixels 10 and is emitted toward the original. When the light of the light source is changed, the amount of light reaching the document changes.

That is, by controlling the amount of light passing through, the internal liquid crystal of the pixel for display is controlled as a shutter to control the amount of light to the original. If the liquid crystal display panel is controlled to pass the light from the light source as it is, the output from the sensor panel will increase, and if the display of the liquid crystal display panel is controlled to be dark, the output from the sensor panel will decrease. It is.

By controlling the contrast of each pixel of the liquid crystal display panel, each of the photovoltaic cells stacked as a pair outputs a signal corresponding to the amount of light. Therefore, each output signal can be controlled by a combination of the photocell of the sensor panel and the pixel of the liquid crystal display panel.

With the above-described configuration, an apparatus capable of outputting a uniform signal can be realized by controlling the contrast ratio of the combined pixels, even if the device itself cannot be made to have uniform characteristics.

[Embodiment 3] In order to perform reliable reading, it is necessary to reflect light with a document being securely brought into close contact with the sensor panel. However, depending on the document, there are times when it is difficult to adhere to the sensor panel due to wrinkles, folds, or the like.

The difference in the degree of close contact between the sensor panel and the document is detected as different information depending on the portion of the document.
This is because the output signal differs depending on the distance even for the same black information. Although very slight, wrinkles cause a difference in the degree of adhesion between the sensor panel and the document, and there is a problem in that when the image is formed, it becomes blurred.

For example, there is a case where wrinkles do not grow just by placing a document to be read on a desk and placing the sensor panel downward. Therefore, FIG. 4 shows a cross-sectional configuration diagram of the third embodiment in which the original is pressed by the fine movement unit and reading is performed while wrinkles are extended.

Fine movement portions 95a and 95
The information reading device surrounded by the envelope provided with b is placed, and wrinkles are stretched while pressing the document 1. The sensor panel 2 and the liquid crystal display panel 4 are moved in the document direction by the fine movement units 95a and 95b, and the document 1 is extended by the moved sensor panel 2.
A piezoelectric element that is small and easy to move finely is used.

Next, how the fine movement units 95a and 95b finely move will be described with reference to FIG. Here, the piezoelectric element is an element that can reversibly convert electric energy into 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 a ceramic which has been subjected to an operation (polarization treatment) of applying a 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. , And the piezoelectric effect is exhibited by the polarized piezoelectric ceramics in accordance with external energy. In this manner, the piezoelectric effect does not occur unless the domains are aligned by performing the polarization processing.

When polarized, large distortion occurs in the polarization direction differently in the case of non-polarization, and this distortion exhibits an inverse piezoelectric effect according to an external electric field. This effect is mainly obtained when the direction of the electrode of the longitudinal effect and the direction of the stretching strain are the same (piezoelectric constant d33).
In some cases, the electrode direction of the lateral effect and the direction of the stretching strain are perpendicular (piezoelectric constant d31).

The relationship between the applied voltage and the expansion / contraction direction is determined depending on whether the design uses the vertical effect or the horizontal effect.

FIG. 5A shows a state in which a voltage is applied to the piezoelectric element of the fine movement unit designed for the lateral effect, and FIG.
a is taken out, and a state in which a voltage is applied thereto is shown. When the lateral effect is designed as shown in the drawing, the direction of the electrode and the direction of displacement of the expansion and contraction portion are perpendicular.

When a positive voltage 92 is applied to the polarization electrode 91 of the fine movement part 95a, the polarization electrode 91 tends to expand in the polarization direction due to the lateral effect, and consequently the movement 1 that contracts in the vertical direction.
It becomes 05.

Next, when a negative voltage 92 is applied, the polarization electrode 91 tends to contract in the polarization direction due to the lateral effect, and consequently tends to extend in the vertical direction.

When the standard state is 90, the state of expanding in the polarization direction and contracting in the vertical direction is 90a, and in the state of contracting in the polarization direction, the state of expanding in the vertical direction is 90b.

In this way, the fine movement section 95a and the fine movement section 95b are expanded and contracted to push the sensor panel 2 against the original 1.

FIG. 6 shows another example of the fine movement section. In the configuration of the drawing, the sensor panel 2 and the liquid crystal display panel 4 are sandwiched between the fine movement units 1000 and 1001, and the operation of each of the fine movement units causes the sensor panel 2 to move the original 1.
Approached.

[Embodiment 4] Next, FIG. 7 shows a configuration provided with a document fine movement section for moving a document in a two-dimensional direction as a fourth embodiment. The problem in the first embodiment is that when reading the original 1 on which information such as a straight line running parallel to the electrodes constituting the sensor panel 2 is read, the detection is performed by the photovoltaic cells arranged in a line depending on the manner of light reflection. And the signal output is reduced.

In this embodiment, the detection signal for slightly moving the original 1 slightly is configured to be strong.
The document fixing unit 11 is controlled by the document fine movement units 1100 and 1110.
20 to the left and right 1130, and the original 1
Move like. In FIG. 7, only the left and right directions of movement are shown. However, by providing a plurality of fine moving parts and using the fine moving parts having the same structure, two-dimensional movement is possible.

Next, how the original fine movement units 1100 and 1110 finely move will be described with reference to FIG.

The first original fine movement unit 1100 and the second original fine movement unit 1110 can be freely expanded and contracted by operating the voltage, and the original fine movement units 1100 and 1110 are sequentially expanded and contracted (the original fine movement unit 1100 is extended). When the original fine movement unit 111
When the original fine movement unit 1110 is extended, the original fixing unit 1120 is moved left and right by contracting the original fine movement unit 1110 (when the original fine movement unit 1110 is extended). Therefore,
The original can be fixed with an elastic fixing material at the end of the original fixing portion 1120, and can be finely moved with respect to the sensor panel to move the original.

As described above, it is possible to provide an information reading apparatus in which a document can be freely finely moved by voltage input.

[Fifth Embodiment] In the first embodiment,
The light from the light source alone may weaken the signal from the sensor panel. As shown in FIG. 3, if the light is weak, no output can be obtained. Thus, in the present embodiment, an opening / closing means is provided for separating the sensor panel 2 from the liquid crystal display panel 4 independently while maintaining the relationship between the photovoltaic cells of the sensor panel 2 and the pixels of the liquid crystal display panel 4.

FIG. 9 is an external view of the structure, and FIG. 10 is a drawing viewed from the lateral direction. As shown in FIGS. 9 and 10, the operation of the opening / closing unit 150 enables the sensor panel 2 to be moved from the liquid crystal display panel 4 to the original 1 while being rotated. The light used for reading the original 1 is switched from the light 151 from the light source 3 to the external light 152.

In this configuration, the strong external light 1
52 can be used. Of course, the display can be made easier to see by removing the sensor panel 2 from the upper part of the liquid crystal display panel 4.

In particular, when reading by the sensor panel 2 is not required, the sensor panel 2 is rotated and the light source 3
It is desirable to be able to bring back to the back.

When the external light 152 is used by the sensor panel 2, the light source light 151 is not required, so that it is desirable to turn off the light. Flicker noise or the like due to the light source 3 may jump into the sensor panel 2 and disturb the detection signal. Of course, it is desirable to turn off the lights other than the display also from the viewpoint of power consumption.

Next, display and reading scanning will be described. As shown in FIG. 11, the scanning of the sensor panel 2 for reading the original 1 is delayed by one horizontal period so that the display line 171 of the liquid crystal display panel is scanned after the scanning of the line 170 is completed, so that the feeling is close to real time. Can reproduce and display the original.

The scanning order is as follows.
0, display line 171, read line 172, and display line 173 are desirable. As a result, during the display scanning period, reading scanning of the next line can be performed, and the entire scanning period from completion of reading to completion of display can be shortened.

When a plurality of originals are sequentially read, when the scanning of the sensor panel 2 is completed and the signal is processed for scanning on the liquid crystal display panel 4, A scanning unit for each original is proposed so that the sensor panel 2 can be scanned as the next original. That is, after the scanning of the sensor panel 2 is completed,
Scanning for display on the liquid crystal display panel 4 is performed.

According to this method, there is an effect that the whole information data read from the document 1 can be processed such as image processing. Also, when using external light, the effect is exhibited in a method such as turning off the light source.

FIG. 12 shows a modification of the present configuration in which the operation check as to whether or not the photocell responds to light can always be performed. The sensor panel 2a is opened and closed by the opening / closing means 180,
Rotate so as to go under the light source 3. The position of the sensor panel 2b described above is a reading position by external light.

The light source 3 is further rotated, brought to the position of the sensor panel 2c, and arranged on the back surface of the light source 3. In this state, a dark room state 181 can be created so that light does not enter from the outside on the back surface of the sensor panel 2c and the light source 3. By operating the sensor panel 2c in the dark room state 181, the dark current of the photocell of the sensor panel is obtained.

If the output is output at the value of the dark current, the operation of the sensor panel can be confirmed. If the photovoltaic cell is defective, the resistance current becomes the leakage current, the leakage current flows, an output other than the dark current is obtained, and the operation can be confirmed immediately. It can be used effectively as an operation check mode before reading. In particular, the sensor panel that has changed over time can be immediately confirmed.

[Sixth Embodiment] Next, there is proposed a configuration in which the XY scanning of the sensor panel is performed only by one-side scanning using the liquid crystal display panel provided below the sensor panel, thereby reducing the number of scanning IC drivers. FIG. 13 is an explanatory diagram of the configuration. The drawing shows a state in which a sensor panel is stacked on a liquid crystal display panel and a bias voltage is applied to operate each photovoltaic cell of the sensor panel.

A sensor panel including a plurality of photovoltaic cells 220 arranged in a matrix between the first electrode and the second electrode is scanned by the scanning circuit, and the selected photovoltaic cell 220 to be read is selected. , Are sequentially amplified by the detection amplification section 251 until a necessary signal is output from the output terminal.

The detection amplification section 251 is connected to the anode 190 of the photovoltaic cell 220. Bias generation circuit 250
Outputs a voltage V. The output voltage is set so that a negative voltage can be output. This voltage V is applied to the electrode 1 on the anode side of the other photocells 224, 225, and 226 that are not detected.
90.

The detection amplification section 250 is connected to the ground voltage 25.
2, a virtual ground is created and used as the basic potential of the detection amplification unit 250.

That is, a voltage of zero is applied to the anode 190 of the photovoltaic cell 220 as a virtual ground.

FIG. 14 shows the characteristics of the photovoltaic cell. The output of the forward bias region becomes zero along the X axis when the forward bias voltage is 0.5V. This state is set to OFF. When the voltage applied to the photovoltaic cell is zero, an output signal from the photovoltaic cell is seen. This state is turned on. Reading is performed using these two points, ON and OFF.

In order to apply the bias voltage to create the above-described two-point state, the bias generation section 250 is connected to the electrode 190 of the photovoltaic cell that is not read, and further to the detection amplification section 250.
Is connected to the ground potential 252 of the operational amplifier 251 to form a virtual ground equivalent to the ground potential 252 of the negative-phase input terminal 253, thereby leading the virtual ground to the photovoltaic cell. .

Further, all the electrodes 191 on the cathode side of the photovoltaic cell are set to the zero potential as the ground potential. By applying each of the above voltages to the photovoltaic cell group, all the photovoltaic cells 2 connected to the photovoltaic cell 253 to be read are connected.
20, 221, 222 and 223 are turned ON.
The other photocells 224, 225, 226,... Are turned off.

The photovoltaic cell 220 is biased by 0V.
This state is an ON point when represented by the I / V characteristics in FIG. That is, an output can be obtained when light is applied.

The photovoltaic cell 221 receives a 0 V bias.
This state is an ON point when represented by the I / V characteristics in FIG. That is, an output can be obtained if light is also applied here. The same applies to the photovoltaic cells 222 and 223.

The photovoltaic cell 224 is forward-biased by 0.5V. This state is shown in the I / V characteristic diagram of FIG.
It is point F. That is, an output cannot be obtained even when light is applied. The same applies to the photocells 225 and 226.

Here, what is important is that the photovoltaic cell 2 to be detected is
There is a photocell that is ON other than 21.

Therefore, the pixels of the liquid crystal display panel are controlled in a line shape so that the light from the light source is emitted as one line to the sensor panel. This line of light is emitted at right angles so as to intersect the array of photocells that are ON. In this state, only the signal of the photocell 221 which is the intersection of the light of the light source with one line 195 and the array of photocells that are ON is output.

Although the photovoltaic cell 220 is in the ON state, there is no output because no light is applied. The photocell 227 is an OF cell.
There is no output because light is applied in the state of F. The above-described state is a signal detection method that is enabled by stacking the sensor panel and the liquid crystal display panel.

FIG. 15 is an explanatory diagram of scanning of the sensor panel at this time. The electrodes of the sensor panel are
6, 197 and 198 are scanned. Here, the Y direction scanning is not performed on the sensor panel. This is because all the photocells in the Y direction of the line detected in the X direction are ON. On the other hand, the optical line 195 of the liquid crystal display panel is scanned in the Y direction.

As described above, 1 for the sensor panel
A feature of the present embodiment is that information can be read accurately by scanning only in the direction.

[0075]

According to the structure provided with the liquid crystal display panel, the information read from the sensor panel can be displayed as it is on the liquid crystal display panel arranged below the sensor panel. In other words, after the original is loaded on the sensor panel and the information is captured, the original information is displayed on the LCD panel, and since the LCD panel and the sensor panel are stacked, the original information is copied on the spot. You can enter information into

Further, since the light source, the liquid crystal display panel, the sensor panel, and the original are stacked in this order and the information of the original can be detected, the backlight necessary for the liquid crystal display panel and the information detection can be obtained. A single light source can be used for the necessary sensor panel, and a thin device having both functions of reading and displaying information can be provided.

Further, a pixel of the liquid crystal display panel has a portion on which a display pixel electrode and a TFT are mounted. The TFT portion is a portion which does not transmit light from a light source and does not display, and an area on which the TFT is mounted is used. An efficient device that makes good use of the disadvantages that cannot be achieved can be obtained.

In this state, when viewed from the side where the original is placed, the photovoltaic cell is overlaid on the TFT of the liquid crystal display panel, and the display pixel electrode portion transmits the light through the sensor panel so that the information is not hindered and the display performance is not hindered. Can be seen.
Furthermore, the photocell is closest to the document and can accurately detect the reflected light of the document without being obstructed.

Further, the fine movement portion can be easily determined by the voltage by using a piezoelectric element made of a piezoelectric material capable of reversibly converting electric energy into mechanical energy. With the configuration using the piezoelectric element, it is possible to provide a small-sized fine movement unit which is small, can generate a large force, has a quick response, has a high displacement accuracy, is lightweight, and is inexpensive.

Further, since the structure can be made very small, the device does not obstruct the sensor surface and the display surface and does not easily cause discomfort. Further, 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. This fine movement part can be freely changed by the user.

[Brief description of the drawings]

FIGS. 1A and 1B are explanatory diagrams of a positional relationship between a sensor panel and a liquid crystal display panel in an information reading apparatus of the present application, wherein FIG. 1A is a top view and FIG. 1B is a perspective view.

FIG. 2 is an enlarged view of a photovoltaic cell forming section.

FIG. 3 is a diagram showing a change in an output value of a photovoltaic cell according to illuminance of light.

FIG. 4 is a cross-sectional view of a configuration according to a third embodiment.

FIG. 5 is a diagram illustrating the operation of fine movement units 95a and 95b.

FIG. 6 is a diagram showing another example of the fine movement unit.

FIG. 7 is a cross-sectional view of the configuration of the fourth embodiment.

FIG. 8 is an explanatory diagram of the operation of the original fine movement units 1100 and 1110.

FIG. 9 is an external view of a configuration according to a fifth embodiment.

FIG. 10 is a diagram of the configuration of the fifth embodiment viewed from the lateral direction.

FIG. 11 is a diagram illustrating scanning for display and reading according to the fifth embodiment.

FIG. 12 is an operation explanatory diagram of a modification of the fifth embodiment.

FIG. 13 is a schematic diagram of a configuration according to a sixth embodiment.

FIG. 14 is a characteristic diagram of the photovoltaic cell according to the sixth embodiment.

FIG. 15 is an explanatory diagram of a state of scanning of a sensor panel.

FIG. 16 is a diagram showing a configuration of a conventional information reading device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Original 2 Sensor panel 3 Light source 4 Liquid crystal display panel 10 Pixel electrode 11 TFT 40 Amorphous silicon layer 41 First electrode 42 Second electrode 43 Transparent board 45 Photocell

Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI H04N 5/335 G06F 15/64 Z 5/66 102 H01L 29/78 614

Claims (3)

[Claims] 1. A sensor panel configured to include a plurality of photovoltaic cells and reading information on a recording medium, a liquid crystal display panel having a TFT and a pixel electrode and reproducing and displaying information read by the sensor panel. In the information reading device including a light source as a backlight of the liquid crystal display panel, the surface area of the photovoltaic cell is substantially the same as the surface area of the TFT, and the photovoltaic cell and the TFT are arranged so as to overlap each other. An information reading device characterized by being performed. 2. The sensor panel includes a transparent substrate, a first electrode and a second electrode formed on the transparent substrate, and amorphous silicon. The photovoltaic cell includes the first and second electrodes, and The first and second electrodes are formed in a stripe shape, and the first and second electrodes formed in portions other than the photovoltaic cell forming portion have line widths of the photovoltaic cell forming portions. 2. The information reading device according to claim 1, wherein the information reading device is formed to be thinner than that formed in the portion. 3. An information reading apparatus which obtains information by reflecting light on a document on which image information such as characters and figures are written, and detecting the reflected light, comprising: A sensor panel consisting of a photocell, a liquid crystal display panel that reproduces and displays information written on the document, and irradiates light to the document closely attached to the sensor panel, and as a display backlight of the liquid crystal display panel A light source unit to be used, a unit that scans a plurality of photocells of the sensor panel,
Scanning control means for controlling means for scanning a plurality of pixels of the liquid crystal display panel, wherein the control means performs any one of XY-axis scans on a document required for reading information by scanning the sensor panel. One line performs line scanning with the photovoltaic cell in the ON state, and the other one of the lines performs line scanning with one line of the liquid crystal display panel passing the light of the light source. An information reading device for reading information on an intersection between the light source light of one line and the transmission state.