JP2000019478A - Liquid crystal display - Google Patents

Abstract

(57) [Summary] [Problem] By forming an image sensor and a liquid crystal display portion on the same substrate, a target image can be displayed as it is,
In addition, display images can be taken out and redisplayed. A substrate (50) and a photoelectric conversion unit (3) formed on the substrate for converting incident light from a target image into an electric signal and arranged two-dimensionally in a row direction and a column direction.
9, a storage unit 45 that converts a signal from the photoelectric conversion unit 39 into a voltage and stores the voltage, and a reading electrode 54 connected to the storage unit 45.
And the pixel electrode 38 and the pixel electrode 3 connected to the readout electrode 54 of the image sensing unit 26.
8, a liquid crystal layer 36, and at least a transparent electrode 37 provided opposite to the pixel electrode 38 with the liquid crystal layer 36 interposed therebetween, and the image display unit 27 provided on the same substrate.
And can be used as a finder such as a VTR, and after taking out a display image and recording it,
Playback display is also possible.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device which can be used as a finder of a small VTR (Video Tape Recorder) or the like.

[0002]

2. Description of the Related Art In recent years, with the rapid development of semiconductor integrated circuit technology and image processing technology, a large number of compact and excellent liquid crystal display devices have been proposed, such as small liquid crystal televisions and liquid crystal display portions of computers. Are incorporated as display devices of various devices.

FIG. 14 shows a conventional reflection type liquid crystal display device based on a silicon substrate. In FIG. 14A, the reflection type liquid crystal display device focuses light from a high-intensity light source (not shown) on the silicon substrate 4 side from the direction of the glass substrate 1 (upward in the figure) and passes through the liquid crystal layer 2. The light is optically reflected by the metal layer also serving as the pixel electrode 3 (having a role of a mirror), and the optical signal that has passed through the liquid crystal layer 2 and polarized again is enlarged and displayed by an optical system (not shown). Normally, such a silicon-based reflective liquid crystal display device generates a considerable amount of heat because it condenses a high-luminance light source. Therefore, a heat sink 6 is attached to the package 5 to release the heat and cool the liquid crystal display device.

FIG. 14B shows a typical structure of a chip of a liquid crystal display device. A storage unit 11 and a lead-out unit 12 are formed on a silicon substrate 10, and a pixel electrode 3 is further formed thereon via a contact 13. Since the pixel electrode 3 is usually formed of aluminum, light in the visible light region is reflected by the pixel electrode 3. The voltage applied to the liquid crystal is controlled by the pixel electrode 3 set to the signal voltage of the storage unit 11 and the voltage of the transparent electrode (not shown) located at the opposite position to display an image. In order to maintain the signal of the storage unit 11, it is necessary to have a large capacitance of about pF. For that purpose, the storage capacitor 14 is formed. The data line 15 and the gate line 16 are bias lines for externally writing a signal voltage to the storage unit 11.

FIG. 14C shows an equivalent circuit of a conventional unit cell. The unit cell is a transistor 9 (9a, 9b,...)
And the liquid crystal layer 2 (2a, 2b,...). An external analog signal is written from the data line 15 (15a, 15b,...), And is written to the pixel electrode 3 as a signal voltage by turning on the transistor 9.

However, in the conventional silicon-based reflection type liquid crystal display device, since only a signal voltage is written from the outside, a real-time display like a view finder cannot be performed. If only display is to be performed, a view finder may be used. However, according to such a configuration using only the finder, there is a problem that image signals cannot be electrically picked up only by real-time display. .

[0007]

As described above, according to the conventional liquid crystal display device, by writing an external signal voltage to the storage section, the arrangement direction of the liquid crystal in the liquid crystal layer is changed to perform the liquid crystal display. For example, there is a problem that only one of the two methods can be displayed, for example, an image incident from an object is displayed as it is by a viewfinder or the like.

According to the present invention, there is provided an image sensing unit for converting an optical signal incident from a target image into an electric signal to sense the target image, and converting the image signal sensed by the image sensing unit into an electric signal using a liquid crystal. By forming at least the same image display on the same substrate as changing the orientation of the crystal of the layer, the target image can be displayed as it is like a finder and the image recorded like a reproducing device. It is an object of the present invention to provide a liquid crystal display device which can also reproduce and display the data.

[0009]

According to a first aspect of the present invention, there is provided a liquid crystal display device, comprising: a substrate; and an incident light from an image formed on a surface of the substrate and incident through an optical system. A photoelectric conversion unit which is two-dimensionally arranged in a row direction and a column direction for converting into an electric signal, a storage unit which converts a signal of the photoelectric conversion unit into a voltage and stores the voltage, and a readout electrode connected to the storage unit. An image sensing unit including at least a pixel electrode connected to a readout electrode of the image sensing unit, a liquid crystal layer formed on the pixel electrode, and a transparent electrode provided opposite to the pixel electrode with the liquid crystal layer interposed therebetween And an image display unit provided on the same substrate.

According to a second aspect of the present invention, in the liquid crystal display device according to the first aspect, a semiconductor substrate as the substrate and one side of the semiconductor substrate as a light receiving surface for the incident light are provided. The image sensing unit formed on the other surface side, and an image display unit formed on the other surface side of the semiconductor substrate via the image sensing unit, the light receiving surface of the image sensing unit and the image The display surface of the display unit is formed on both the front and back surfaces of the semiconductor substrate.

According to a third aspect of the present invention, there is provided a liquid crystal display device according to the first aspect, wherein a cell portion comprising a plurality of cells two-dimensionally arranged on a glass substrate as a substrate, and the cell portion. A polysilicon layer formed in a lattice on the upper surface, a liquid crystal layer formed on the polysilicon layer, a transparent electrode formed on the liquid crystal layer, and a color formed on the transparent electrode. And a filter unit, wherein the photoelectric conversion unit is provided together with a display electrode for each cell of the cell unit, one surface side of the glass substrate as the light receiving surface, and the other surface side of the glass substrate as a display surface. It is characterized by performing transmissive display.

Further, the liquid crystal display device according to claim 4 is
2. The image sensing unit according to claim 1, wherein the image sensing unit includes a semiconductor substrate as a substrate, and the photoelectric conversion units arranged two-dimensionally on one surface side of the semiconductor substrate in n rows and m columns. A bias generation circuit provided between the image sensing unit and the image display unit, wherein the image display unit is formed on the one surface side of the semiconductor substrate, and the image display unit generates a voltage for displaying an image; Wherein the image sensing unit, the image display unit, and the bias generation circuit are formed in parallel on the same surface of the semiconductor substrate, and a light receiving surface of the image sensing unit and a display surface of the image display unit are provided. Are provided on the same surface side.

According to a fifth aspect of the present invention, in the liquid crystal display device according to the fourth aspect, the bias circuit provided between the image sensor and the image display unit is provided for the image sensor. A first vertical signal line provided, a second vertical signal line provided for the image display unit,
And amplifying circuit or capacitor provided between the two vertical signal lines and the two vertical signal lines to amplify a signal voltage, wherein the signal voltage of the first vertical signal line is applied to the second vertical signal line. It is not directly supplied.

The present invention is configured as described above.
A photoelectric conversion unit is arranged two-dimensionally in a row (horizontal) and a column (vertical) direction on one surface of a semiconductor substrate, and a storage unit for converting a signal of the photoelectric conversion unit into a voltage and storing the voltage is provided. A pixel electrode is connected to the storage section, a liquid crystal layer is formed on the pixel electrode, a transparent electrode is formed on the liquid crystal layer, a color filter section is formed on the transparent electrode, and a semiconductor substrate is formed. By configuring a silicon-based reflective liquid crystal display device in which an optical signal is incident from the other side and converted into a signal electrified by the photoelectric conversion unit, an image signal can be picked up while performing real-time display. good. With this configuration, unlike a viewfinder, an image signal can be electrically read out to the outside while displaying in real time.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a liquid crystal display device according to the present invention will be described below in detail with reference to the accompanying drawings. In the present invention, a type in which a light receiving surface for incident light from a target image and a display surface of an image (liquid crystal) display unit are provided on both front and back surfaces of one substrate may be described as a transmissive type for convenience. However, as is apparent from the description of the means for solving the above problems, the present invention is to display on the liquid crystal layer of the image display unit by an electric signal photoelectrically converted by the image sensing unit, In a strict sense, light is not transmitted and displayed.

FIG. 2 shows a first embodiment of the liquid crystal display device according to the present invention.
1 shows an example of a digital camera using a silicon-based reflective finder as an embodiment. The liquid crystal display device according to the first embodiment has a so-called transmissive structure from the relationship between the target image and the display image. FIG.
1A, a lens unit 21 is provided on the front surface of a digital camera 20, and a shutter button 2 is provided on the upper surface.
2 are provided. As shown in FIG. 2B, an optical signal of incident light 24 incident from an object image (not shown) via the optical lens 23 of the lens unit 21 is transmitted to a photoelectric conversion unit of a silicon-based reflective finder chip 25. The light is condensed on 26 and is displayed on a liquid crystal display unit 27 provided on the back surface of the chip 25.

FIG. 2C shows the appearance of the back surface of the digital camera 20. A liquid crystal display unit 27 provided on the photographer side has a photoelectric conversion unit disposed on the target image side of the chip 25. The image converted into the voltage signal by 26 is displayed. With this method, image information can be displayed in real time, and image information can be picked up by supplying the voltage signal converted by the photoelectric conversion unit 26 as a recording signal to the outside. In the first embodiment, a substrate (not shown) is provided on the chip 25, and a photoelectric conversion unit 26 as an image sensing unit and a liquid crystal display unit 27 as an image display unit are provided on the substrate (not shown). Are provided integrally.

FIG. 3 shows a liquid crystal display device according to a second embodiment of the present invention. The second embodiment is an example in which the present invention is applied to a reflection type liquid crystal projector, but from the aspect of displaying an image, this embodiment is also a transmission type display. The incident light signal 24 from the target image 24a is focused on the silicon chip 25 by the lens 23. The collected optical signal 24 is converted into a voltage (charge) signal by a sensor unit 26 as an image sensing unit, and is displayed on a liquid crystal display unit 27 as an image display unit formed on the back surface of the chip 25. The chip 25 has a sensor section 26 and a liquid crystal display section 27 formed on one side or both sides of a silicon substrate 28, respectively.

Reference numeral 30 denotes a projector for enlarging and displaying an image displayed on the liquid crystal display unit 27 using an optical system. The projector 30 irradiates the liquid crystal display unit 27 with irradiation light 29 of high luminance, captures a reflected light signal 31 light-modulated by a liquid crystal layer formed on the silicon chip 25, and displays an enlarged display via an optical system. The displayed image 24B is displayed on the display surface 31 of the projector. Although the size of the chip 25 as a finder does not correspond to the size of the projector 30 for convenience of illustration, the projector display surface 31 is configured as a large screen of 40 to 60 inches.

FIG. 4 shows an outline of the silicon chip of the present invention. In FIG. 4, on a silicon chip 25, an image pickup section 26 is formed on the back side, and a liquid crystal display section 27 is formed on the front side. Liquid crystal display 27
, A vertical register section 32 is formed, and a horizontal register section 33, a horizontal signal line 34, and an output amplifier 3 are formed on the lower side.
5 are formed. In this circuit configuration, the image pickup unit 26 receives an image signal and displays the image signal on the liquid crystal display unit 27 in real time.
5 can be extracted to the outside as an electric signal.

FIG. 5 shows a circuit configuration inside the unit cell. In FIG. 5, the liquid crystal display unit 27 includes a liquid crystal layer 36,
A transparent electrode 37 and a pixel electrode 38 provided on both surfaces of the liquid crystal layer 36 are provided, and a bias voltage is supplied to the transparent electrode 37 from a bias terminal 37A. The pixel electrode 38 has a circuit configuration shown by the equivalent circuit diagram in FIG. 4 formed inside the unit cell. In FIG. 5, the image sensing unit 26 includes a photodiode 39, a reading transistor (READ) 40, a first capacitor (C1) 41,
Reset transistor (RESET1) 42, its gate terminal 43, its source terminal 44,
A first charge storage unit 45 corresponding to a connection point between the first capacitor 41 and the first capacitor 41 and the transistor 43; a second reset transistor 46 connected to the capacitor 41; a drain terminal 47; A second charge storage unit 48 corresponding to a connection point between the transistor 46 and the capacitor 41;
(C2) 49.

The operation of FIG. 5 will be described briefly. Before reading the signal of the photodiode, the first reset transistor (RESET) 42 and the second reset transistor (RESET) 46 are turned “ON”, and the signals of the first storage unit 45 and the second storage unit 48 are output. First desired voltage (V1) 47
And the second desired voltage (V2) 44. Thereafter, the reset transistors 42 and 46 are turned "OFF". The signal charge photo-charge-converted by the photodiode 39 is read out to the first storage section 45 by turning on the readout transistor 40. The signal voltage that has been charge-voltage converted by the capacitance of the first storage unit 45 is the first voltage.
Is transferred to the second storage section 48 in the floating state by the capacity (C1) 41 of the storage section. Since the transmitted signal voltage is applied to the pixel electrode 38, the state of the liquid crystal layer 36 is controlled by the voltage of the pixel electrode 38 and the voltage of the transparent electrode 37.

FIG. 1 shows the silicon chip 2 shown in FIG.
It is sectional drawing which shows the cross-section of FIG. In FIG. 1, a photodiode section 39 and a reading transistor 40 are formed on a P well or a P substrate 50. A color filter 51 and a micro lens 52 are provided on the back surface side of the silicon substrate 50, and the optical signal 24 emitted from the back surface is collected by the micro lens 52 (not necessarily provided). The light is transmitted through the color filter 51, is subjected to color separation, and is subjected to light-charge conversion by the photodiode unit 39. The signal charge of the photodiode section 39 is
The data is read out to the storage section 45 by the read-out transistor 51, and transmitted as a signal voltage to the first capacitor (C1) 41, which is the counter electrode. Reference numeral 91 denotes a glass substrate, and reference numeral 99 denotes a color filter.

The signal voltage of the capacitor 41 as a counter electrode is transmitted to the pixel electrode 38 via the contact 53, the electrode 54 and the contact 55. In order to increase the capacitance of the pixel electrode 38, the additional capacitances 56 and 57 are added to the LOCOS layer 58.
Is provided on the thick part. This LOCOS layer 5
The photodiode portion 39 and the first storage portion 45 are formed of N-type impurities on the substrate 50 side of the thick portion 8 and a readout transistor is formed on the pixel electrode 38 side of the thick portion of the LOCOS layer 58. 40 and a first capacitor 41 as a counter electrode are formed.

The liquid crystal layer 36 provided between the pixel electrode 38 and the transparent electrode 37 is controlled by a voltage applied to the pixel electrode 38. As a result, the incident light 5
An image can be displayed by using the optical system 20 as shown in FIG. 2 using reflected light 60 obtained by optically modulating 9 with a liquid crystal layer 36.

The reason why the image sensing section 26 and the liquid crystal display section 27 are formed in a cell configuration as shown in FIG. 5 is to write the voltage applied to the pixel electrode 38 with an accuracy of several mV order. The voltage of the bias voltage V1 is reset for each cell, and the signal is transmitted by the capacitance division of the first and second capacitances C1 and C2 which can be formed with high accuracy. Nonuniformity of the signal voltage written to the pixel electrode 38 can be suppressed.

FIG. 6 is a plan view of a liquid crystal display according to a third embodiment of the present invention. In the liquid crystal display device according to the third embodiment, an image sensing unit 26 and an image display unit 27 are formed in parallel on the same surface side of a substrate, and a light receiving surface of incident light from a target image and a display of a display image are displayed. This is a so-called reflection type liquid crystal display device in that the surface is provided on the same surface side. A bias generation circuit 61 is formed between the image sensing unit 26 and the liquid crystal display unit 27 provided on the silicon substrate 50. Each of the cells 62a to 62f,... Of the image sensor unit 62 of the image sensing unit 26 is selected for each row, and is read out to the vertical signal lines 63a to 63c,. The image sensing section 26 has vertical registers 64 on both sides of the image sensor section 62.

The signal voltages of the vertical signal lines 63a to 63c... Take a signal voltage value having a variation in the output voltage due to a variation in the threshold value of the transistor in the cell. The bias generation circuit 61 includes sample-and-hold capacitors 65a, 65b, 65c,.
a, 66b, 66c,...
a, 67b, 67c,... The signal reading operation is performed by the first vertical signal lines 63a to 63c.
First, a reset voltage is generated, and then a signal voltage is generated. When a reset voltage appears on the vertical signal lines 63a to 63c, the second vertical signal lines 68a, 68b, 68c,... Are turned ON by the clamp transistors 67a, 67b, 67c,. Set to voltage. At this time, the transistors 69a to 69c,... In a certain row of the liquid crystal display unit 27 are turned on, and have the same clamp voltage as that of the second vertical signal lines 68a to 68c,.

Thereafter, the clamp transistors 67a, 6
By turning off 7b, 67c,...
Of the vertical signal lines 68a to 68c are floating. The first vertical signal lines 63a, 63b, 63c,...
When a signal voltage appears on the sample and hold capacitor 6
The signal voltage is transmitted to the second vertical signal lines 68a to 68c,... Via 5a, 65b, 65c,.
Is written to. As a result, it is possible to obtain the liquid crystal display unit 27 capable of obtaining a gradation, in which the variation of the writing voltage to the pixel electrode of about several mV or less is suppressed. In the case of the present invention, the image sensor unit 26 and the liquid crystal display unit 27 are on the same plane, and have a configuration different from that of the liquid crystal display device according to the second embodiment shown in FIG.

FIG. 7 shows a liquid crystal display device according to a fourth embodiment of the present invention. The liquid crystal display device according to the fourth embodiment is different from the liquid crystal display device according to the third embodiment shown in FIG. 6 in that the internal configuration of the bias generation circuit 71 is different. In the liquid crystal display device according to the fourth embodiment, the bias generation circuit 71
2, a sample and hold SW 73, clamp transistors 74 and 77, a reference voltage (Vbias1) terminal 79,
A reference voltage (Vbias2) terminal 83, a hold capacitor 75,
76 and an OP-AMP circuit 78.
Reference numeral 80 denotes a sample and hold terminal, 81 denotes a second clamp terminal, and 82 denotes a first clamp terminal.

While the reset signal appears on the first vertical signal line 63a, the hold capacitors 75 and 76 are set to predetermined bias voltages Vbias1 and Vbias2 input from the terminals 79 and 83, respectively. .
After that, the clamp transistors 74 and 77 are turned “OFF”.
, The input of the OP-AMP circuit 78 is brought into a floating state. Then, the first vertical signal line 6
Since a signal voltage appears at 3a, this voltage is transmitted to the sample and hold capacitor 72 and becomes an input to the OP-AMP circuit 78. The difference voltage between the input voltages is supplied to the second vertical signal line 6.
By setting 8a, it is possible to read out faster than the liquid crystal display device according to the third embodiment in FIG.

Next, a liquid crystal display according to a fifth embodiment of the present invention will be described with reference to FIG. FIG. 8 differs from FIG. 7 in that the first reference voltage Vbias1 and the second Vbias2 supplied from the terminals 79 and 83 are eliminated, and the OP-AM
That is, a feedback clamp system using an output signal of the P circuit 78 is employed. With such a configuration, OP-
The offset of the AMP circuit 78 can be compensated, and the second vertical signal line 68 can be faster.
The signal voltage can be extracted to a and the signal voltage can be written to the liquid crystal display unit 27. Note that, with the omission of the first and second reference voltages, the clamp transistor 74 in FIG. 7 is replaced by transistors 74A and 74B, which form a pair with the transistors 73 and 77, respectively. A sample hold signal and a clamp signal are supplied from 81A and 81B.

Next, the circuit configuration of the unit cell section of the present invention will be described with reference to FIG. Inside the unit cell 62, a photodiode section 39, a read transistor 40, a reset transistor 42, an amplifying means 84, a read pulse supply line 85, and a reset pulse supply line 86 are formed.

Next, a unit cell section 62A according to another example of the circuit configuration of the present invention will be described with reference to FIG. The signal accumulated in the photodiode unit 39 performs an accumulation operation only for a desired period, and is thereafter read out to the detection node 45 by the readout transistor 40. Since the detection node 45 is reset by the power supply voltage supplied from the power supply voltage supply line 87 before being read, the detection node 45 performs charge-voltage conversion by the read signal charge, and the signal is vertically The signal is read out to the signal line 63. In this circuit configuration, since the address transistor 88 and the address signal line 89 for supplying an address signal to its gate are provided, a unit cell is formed by adding one capacitor to four transistors.

Next, a liquid crystal display device according to a sixth embodiment of the present invention will be described with reference to FIG. The sectional view shown in FIG. 11 corresponds to the image sensing unit 26 and the liquid crystal display unit 27 of the sectional view of the second embodiment shown in FIG. Note that the sixth embodiment is different from the liquid crystal display device according to the third embodiment shown in FIG.
7 shows a configuration of a so-called reflection type liquid crystal display device in which elements 7 and 7 are arranged in parallel.

In FIG. 11, a P substrate or an N substrate 9
A liquid crystal display unit 27 and an image sensing unit 26 are provided between the first substrate 0 and the glass substrate 91. A P-well region 50 is formed on a substrate 90, and a device isolation portion 58 of a LOCOS oxide film, a data line 92, and a write transistor 93 are formed.
, Storage nodes 95 and 96, electrodes 96, capacitors 97 and 98, pixel electrodes 38, liquid crystal layer 36, transparent electrodes 37, and color filters 99 (99A, 99B, 99C).
And a glass substrate 91. Data line 92
, A predetermined row is selected by the word line 93, and the signal voltage is written to the storage node 95. To hold the written signal, the capacitor section 9
7 and 98 are formed. The electrode 96 serves to connect the storage node 95, the pixel electrode 38, and the capacitor. The incident light 59 incident on the reflection type liquid crystal finder of the sixth embodiment is optically polarized by the liquid crystal layer 36 deflected by the voltage applied to the pixel electrode 38 and the transparent electrode 37 arranged on both sides of the liquid crystal part 36. Reflected light 60. By using the reflected light 60, image information can be displayed in real time.

Next, a liquid crystal display device according to a seventh embodiment of the present invention will be described with reference to FIG. The structure of the liquid crystal display device according to the seventh embodiment is such that each cell of a transmission type liquid crystal display is provided with a photoelectric conversion unit, thereby also serving as a finder. In FIG.
The optical image signal from the object 24A passes through the lens 101 and enters the transmission type liquid crystal finder device 100. The optical signal condensed by the lens 101 is condensed on the glass substrate 102, passes through the display electrode 103 that transmits visible light, passes through the liquid crystal layer 106, passes through the transmissive electrode 107, passes through the color filter 108, ,Is displayed. Display electrode 10
The signal voltage of No. 5 is controlled by the signal voltage of the photoelectric conversion unit 104 generated by the incident light 109. The control method is performed, for example, in the same manner as the liquid crystal display device according to the second embodiment shown in the transmission circuit diagram of FIG. Although illustration is omitted, the signal converted into the signal voltage by the photoelectric conversion unit 104 can be read out to the outside.

FIG. 13 is an equivalent circuit diagram of a unit cell of the liquid crystal display according to the sixth embodiment shown in FIG. The unit cell 110 includes a photodiode section 111, a readout transistor 112, an amplification transistor 114, a load transistor 118, a power supply voltage 120, a GND 122, a reset transistor 115, a reset pulse 116, a selection transistor (also serving as a load transistor) 118,
The selection pulse 117 includes a liquid crystal unit 123.

In this liquid crystal display device, the pixel electrode 1
24 is directly controlled by the voltage 121 of the source follower circuit. For this reason, variation occurs in each cell 110. The variation in each cell is caused by resetting the reset voltage of the detection node 127 by using a feedback effect, that is, by using the reset transistor 115. The variation of 114 is compensated by the reset voltage of the detection node 127.

[0040]

As described above in detail, according to the liquid crystal display device of the present invention, unlike the conventional viewfinder, the image signal can be read out to the outside while the display is performed in real time. Will be able to do it. In addition, a bias generation circuit capable of performing writing with an accuracy of several mV, which is a problem in a reflection type or transmission type liquid crystal display, is newly provided with a cell portion or image sensor portion of a silicon substrate and a display portion. With such a configuration, it is possible to perform high-precision liquid crystal display with high accuracy at several mV and high gradation for liquid crystal.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a configuration of a liquid crystal display device according to a second embodiment of the present invention.

FIG. 2A is a front view, FIG. 2B is a cross-sectional view, and FIG. 2C is a rear view showing the appearance of the liquid crystal display device according to the first embodiment of the present invention.

FIG. 3 is a perspective view showing a configuration of a liquid crystal display device according to a second embodiment of the present invention.

FIG. 4 is a plan view showing an arrangement configuration of a liquid crystal display device according to a second embodiment of the present invention.

FIG. 5 is a circuit diagram showing an equivalent circuit of a liquid crystal display device according to a second embodiment of the present invention.

FIG. 6 is a circuit diagram illustrating a schematic configuration of a liquid crystal display device according to a third embodiment of the present invention.

FIG. 7 is a circuit diagram illustrating a schematic configuration of a liquid crystal display device according to a fourth embodiment of the present invention.

FIG. 8 is a circuit diagram showing a circuit configuration of a bias circuit of a liquid crystal display according to a fifth embodiment of the present invention.

FIG. 9 is a circuit diagram showing a circuit configuration of a unit cell in the liquid crystal display device according to the present invention.

FIG. 10 is a circuit diagram showing a different circuit configuration of a unit cell of the liquid crystal display device according to the present invention.

FIG. 11 is a sectional view showing a configuration of a liquid crystal display device according to a sixth embodiment of the present invention.

FIG. 12 is a perspective view showing a schematic configuration of a liquid crystal display device according to a seventh embodiment of the present invention.

FIG. 13 is a circuit diagram showing a circuit configuration of each cell of a liquid crystal display device according to a seventh embodiment of the present invention.

14A is a sectional view showing a conventional liquid crystal display device, FIG.
(B) Sectional perspective view, (c) Equivalent circuit diagram.

[Explanation of symbols]

 Reference Signs List 20 liquid crystal display device 25 finder silicon chip 26 image sensing unit (photoelectric conversion unit, sensor unit) 27 image display unit (liquid crystal display unit) 28 substrate 36 liquid crystal layer 37 transparent electrode 38 pixel electrode 39 photoelectric conversion unit 40 readout transistor 41 capacitance unit (Counter electrode) 45 Charge storage unit 50 Silicon substrate 61 Bias circuit

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Hideyuki Funaki 1 Toshiba-cho, Komukai Toshiba-cho, Saisaki-ku, Kawasaki-shi, Kanagawa F-term (Reference) 2H088 EA16 EA25 HA08 HA12 HA24 MA20 2H092 HA03 KA04 LA12 RA05 RA10 2H093 NA74 NE03 NE06 NG02 NG20

Claims (5)

[Claims] 1. A substrate, and two-dimensionally arranged photoelectric conversion units arranged in a row direction and a column direction for converting incident light from an image formed on a surface of the substrate and incident through an optical system into an electric signal. A storage unit for converting a signal of the photoelectric conversion unit into a voltage and storing the converted voltage; an image sensing unit including at least a readout electrode connected to the storage unit; a pixel electrode connected to the readout electrode of the image sensing unit; An image display unit including at least a liquid crystal layer formed on the pixel electrode, and a transparent electrode provided opposite the pixel electrode with the liquid crystal layer interposed therebetween, and provided on the same substrate. A liquid crystal display device characterized by the above-mentioned. A semiconductor substrate serving as the substrate, an image sensing portion formed on the other surface of the semiconductor substrate using one surface of the semiconductor substrate as a light receiving surface of the incident light, and the image sensing portion. An image display unit formed on the other surface side of the semiconductor substrate.The light receiving surface of the image sensing unit and the display surface of the image display unit are formed on both front and back surfaces of the semiconductor substrate, respectively. The liquid crystal display device according to claim 1, wherein: 3. A cell part comprising a plurality of cells two-dimensionally arranged on a glass substrate as said substrate, a polysilicon layer formed in a lattice on the upper surface of the cell part, and A liquid crystal layer formed on the top, a transparent electrode formed on the top of the liquid crystal layer, and a color filter formed on the top of the transparent electrode, and a display electrode for each cell of the cell unit. The liquid crystal according to claim 1, wherein the photoelectric conversion unit is provided to perform a transmissive display with one surface of the glass substrate as the light receiving surface and the other surface of the glass substrate as a display surface. Display device. 4. The semiconductor substrate as the substrate, the image sensing unit including the photoelectric conversion units two-dimensionally arranged on one surface side of the semiconductor substrate in n rows and m columns, and The image display unit formed on the one surface side, a bias generation circuit that is provided between the image sensing unit and the image display unit and generates a voltage for the image display unit to display an image, The image sensing unit, the image display unit, and the bias generation circuit are formed in parallel on the same surface of the semiconductor substrate, and the light receiving surface of the image sensing unit and the display surface of the image display unit are the same. The liquid crystal display device according to claim 1, wherein the liquid crystal display device is provided on a surface side. 5. A bias circuit provided between the image sensing unit and the image display unit, a first vertical signal line provided for the image sensing unit, and provided for the image display unit. A second vertical signal line provided between the first vertical signal line and the second vertical signal line, and an amplifier circuit or a capacitor provided between the first vertical signal line and the second vertical signal line for amplifying a signal voltage. The liquid crystal display device according to claim 4, wherein a signal voltage of a line is not directly supplied to the second vertical signal line.