JP2007256634A - Flat panel imaging display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal panel which has image-capturing function, having a wide viewing angle and superior resolution and sensitivity. <P>SOLUTION: A phase compensating plate 38 is arranged collectively only on the side of an external surface 30 of a counter substrate 21 of a liquid crystal panel 1. The phase compensating plate 38 is not made to stack on the side of an external surface 4 of an array substrate 2 of the liquid crystal panel 1. The distance between an imaging element 13 on an internal surface 5 of the array substrate 2 and a subject L, positioned opposite to the external surface 4 of the array substrate 2, can be made small. The decrease in the resolution and sensitivity during imaging of the imaging element 13 due to stacking of the phase compensating plate 38 on the side of the external surface 4 of the array substrate 2 can be prevented. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a flat imaging display device having a plurality of pixels.

  Conventionally, a liquid crystal display device as this type of flat imaging display device is configured such that an array substrate in which a plurality of pixels are provided in a matrix and a counter substrate are arranged to face each other with a liquid crystal layer interposed therebetween, A polarizing plate and a retardation plate are attached to both surfaces of the array substrate and the counter substrate in order to polarize an image to be displayed on the liquid crystal display device and adjust the phase difference of the image.

  In this type of liquid crystal display device, photoelectric conversion elements capable of capturing an image are arranged on an array substrate, and a capacitor is connected to each of the photoelectric conversion elements. The liquid crystal display device can capture an image by detecting the voltages at both ends of the capacitors in a state where the charge amount of the capacitors is changed in accordance with the amount of light received by the photoelectric conversion element.

  Further, as this type of liquid crystal display device, a thin film transistor (TFT) for driving each pixel provided in the liquid crystal display device and a display element as a drive circuit are formed on the same array substrate with polycrystalline silicon (polysilicon). It is possible to form a photoelectric conversion element, and a structure in which a photoelectric conversion element can also be formed in a pixel in a process of forming polycrystalline silicon is known (see, for example, Patent Documents 1 and 2).

Therefore, by combining a photoelectric conversion element for capturing these images and a display element, a liquid crystal display device capable of imaging and display can be manufactured, and a wide viewing angle is required as the liquid crystal display device. Yes.
JP 2001-292276 A JP 2001-339640 A

  However, in the above-described liquid crystal display device, since polarizing plates and retardation plates are respectively attached to both surfaces of the liquid crystal display device, the photoelectric conversion element of the liquid crystal display device depends on the thickness of the polarizing plates and the retardation plate itself. There is a problem in that the resolution and sensitivity at the time of imaging by the camera are reduced.

  SUMMARY An advantage of some aspects of the invention is that it provides a flat imaging display device that can improve the resolution and sensitivity during imaging while adjusting the phase of light during image display.

  The present invention provides a translucent substrate having a display region, a plurality of pixels provided in a matrix in the display region of the translucent substrate, and provided in at least one of these pixels, Display means for displaying an arbitrary image in the display region by adjusting at least one of the wavelength and the amount of transmitted light, and one main surface side of the translucent substrate provided in at least one of the pixels An image pickup means for picking up an object to be picked up, and a phase adjustment means for adjusting a phase of light that is attached only to the other main surface side of the light transmissive substrate and transmits the light transmissive substrate. It is equipped.

  According to the present invention, since the phase adjusting means is attached only to the other main surface side of the translucent substrate, the object to be imaged can be picked up by a plurality of imaging means without being subjected to phase adjustment by the phase adjusting means. The phase adjustment means can adjust the phase of the light transmitted through the translucent substrate when an image is displayed on the display area by a plurality of display means, and the resolution when the object is imaged by the plurality of image pickup means And the sensitivity can be improved.

  The configuration of the first embodiment of the flat imaging display device of the present invention will be described below with reference to FIGS.

  In FIG. 1, reference numeral 1 denotes a liquid crystal panel 1 as a flat image pickup display device. The liquid crystal panel 1 is a transmissive liquid crystal display element having a wide viewing angle, and is a liquid crystal image display apparatus that is a liquid crystal image sensor having an image capturing function. The liquid crystal panel 1 is a display device having a vertical alignment type liquid crystal mode using a wide viewing angle mode called an MVA (Multi-domain Vertical Alignment) method.

  The liquid crystal panel 1 includes a substantially rectangular flat plate array substrate 2 as a pixel array section. The array substrate 2 has a substantially transparent rectangular flat glass substrate 3. This glass substrate 3 has a thickness dimension of, for example, 0.1 mm, and is a light-transmitting substrate as a transparent substrate having light-transmitting properties and electrical insulation properties. And the flat outer surface 4 is formed in one main surface located outside this glass substrate 3, and the flat inner surface 5 is formed in the other main surface located inside this glass substrate.

  Further, an effective pixel region 6 is provided in the center of the glass substrate 3 on the inner surface 5 as a display region for displaying a predetermined image toward the outer surface 4 of the glass substrate 3. In the effective pixel region 6, a plurality of pixels 7 are arranged in a matrix. Each of the plurality of pixels 7 is formed in an elongated rectangular shape in plan view that is a long shape along the vertical direction of the glass substrate 3. Further, each of the plurality of pixels 7 is provided with one pixel electrode 11 for driving liquid crystal, one display element 12 and one imaging element 13 as one pixel constituent element.

  Specifically, on the inner surface 5 of the glass substrate 3, a plurality of scanning lines (not shown) which are gate lines as first wirings are arranged along the width direction of the glass substrate 3. These scanning lines are spaced in parallel at equal intervals toward the lateral direction of the glass substrate 3. Further, on the inner surface 5 of the glass substrate 3, a plurality of signal lines (not shown) which are signal lines as second wirings are arranged along the vertical direction of the glass substrate 3. These signal lines are spaced in parallel at equal intervals toward the lateral direction of the glass substrate 3.

  Therefore, these scanning lines and signal lines are arranged in a lattice pattern so as to be orthogonally crossed on the inner side surface 5 of the glass substrate 3 and wired. A pixel 7 is provided in each rectangular region surrounded by these scanning lines and signal lines. Further, a pixel electrode 11, a display element 12, and an imaging element 13 are provided for each pixel 7 corresponding to each intersection of these scanning lines and signal lines.

  The pixel electrode 11 of each pixel 7 is a transmissive pixel electrode made of ITO (Indium Tin Oxide), and is provided in a rectangular area partitioned by a plurality of scanning lines and signal lines. . Further, the pixel electrode 11 is laminated on the inner side surface 5 of the glass substrate 3. On the inner side surface 5 of the glass substrate 3 adjacent to one side of the pixel electrode 11, an image pickup device 13 as an image pickup means is laminated. The imaging element 13 is a photoelectric conversion element as a driving element such as a photodiode, for example, and is an imaging circuit having a semiconductor layer made of polysilicon (p-Si) as polycrystalline silicon. These imaging elements 13 image a predetermined range corresponding to the arrangement position of each pixel 7 of the subject L as the imaging object positioned opposite to the outer surface 4 side of the glass substrate 3.

  Further, a capacitor (not shown) is electrically connected to the image pickup device 13, and the image pickup device 13 is an image pickup processing circuit (not shown) serving as an image pickup processing unit stacked on the inner side surface 5 of the glass substrate 3. Is electrically connected to and controlled. These image pickup devices 13 change the charge amount of the capacitor in accordance with the amount of received light that enters the same pixel 7 in which these image pickup devices 13 are provided. And the predetermined area | region of the to-be-photographed objects L which oppose these image pick-up elements 13 is imaged by detecting and processing the voltage of the both ends of this capacitor in an image pick-up processing circuit.

  In addition, a display element 12 as a display unit is laminated on the inner side surface 5 of the glass substrate 3 adjacent to one side of the imaging element 13. These display elements 12 are electrically connected to the image electrodes 11 via the image pickup elements 13, and are provided corresponding to these pixels 7 in the same pixel 7 in which these pixel electrodes 11 are provided. . Further, these display elements 12 drive the pixel electrodes 11 in the same pixel 7 to display predetermined images toward the outer surface 4 side of the array substrate 2 in the effective image area 6 of the liquid crystal panel 1. The pixel 7 in which the display element 12 is provided is controlled by changing the potential of the pixel electrode 11 in the pixel 7 in which the display element 12 is provided to control the inclination of the liquid crystal element 35 facing the pixel electrode 11. It is a switching element that adjusts the transmittance of light transmitted through the inside.

  In other words, these display elements 12 adjust the light transmitted through the pixels 7 provided with these display elements 12 and emitted toward the outer surface 4 side of the array substrate 2, so that the array substrate 2 can be effectively used. A predetermined image is displayed in the pixel area 6. In other words, the display elements 12 adjust at least one of the wavelength and the amount of light transmitted through the glass substrate 3 of the array substrate 2 to display a predetermined image toward the outer surface 4 side of the array substrate 2. It is what is displayed. Further, like the image sensor 13, these display elements 12 are constituted by switching elements such as thin film transistors (TFTs) having a semiconductor layer made of polysilicon. Further, these display elements 12 are provided corresponding to the imaging elements 13 in each pixel 7.

  An alignment film 14 is laminated so as to cover the pixel electrode 11, the display element 12, and the imaging element 13. This alignment film 14 is provided by being laminated on the inner side surface 5 of the glass substrate 3, and is a polyimide film for vertical alignment formed by a polyimide alignment process. This alignment film 14 is provided so as to cover each of the pixel electrode 11, the display element 12, and the imaging element 13 provided on the inner side surface 5 of the glass substrate 3.

  On the other hand, a rectangular flat plate-like counter substrate 21 as a common substrate is disposed facing the array substrate 2. The counter substrate 21 includes a glass substrate 22 having a substantially transparent rectangular flat plate shape. The glass substrate 22 is a translucent substrate as a transparent transparent substrate having translucency and electrical insulation. A color filter layer 24 as a colored layer is provided on an inner side surface 23 which is one main surface located on the inner side of the glass substrate 22 facing the array substrate 2.

  Here, the color filter layer 24 includes a green filter layer 25, a blue filter layer 26, and a red filter layer 27 corresponding to the three primary colors of light. The green filter layer 25, the blue filter layer 26, and the red filter layer 27 are arranged such that the pixel electrode in each pixel 7 on the glass substrate 3 is placed with the glass substrate 22 facing the glass substrate 3 of the array substrate 2. 11, and these pixels 7 are alternately arranged in at least one of the horizontal direction and the vertical direction.

  Further, on the color filter layer 24 constituted by the green filter layer 25, the blue filter layer 26 and the red filter layer 27, a counter electrode 28 as a substantially transparent common electrode made of ITO is laminated. Yes. The counter electrode 28 is uniformly laminated on the entire inner surface 23 of the glass substrate 22 and covers the color filter layer 24 on the glass substrate 22. Further, on the counter electrode 28, the glass substrate 22 is opposed to the glass substrate 3 of the array substrate 2 in the longitudinal direction which is the width direction of the pixel electrode 11 in each pixel 7 on the glass substrate 3. An alignment control projection 29 is provided at a position facing the center. These protrusions 29 are formed in a convex shape in a side view protruding toward the pixel electrode 11 side from the surface located outside the counter electrode 28.

  An alignment film 31 is laminated on the protrusions 29 and the counter electrode 28. The alignment film 31 is provided by being laminated on the inner side surface 23 of the glass substrate 22, and is a polyimide film formed by a polyimide alignment process. The alignment film 31 is provided so as to cover each of the protrusions 29 and the color filter layer 24 provided on the inner side surface 23 of the glass substrate 22. Further, the alignment film 31 and the alignment film 14 of the array substrate 2 are provided with a predetermined gap between the alignment films 14 and 31 via a spacer 32 as a substrate gap material. The array substrate 2 and the counter substrate 21 are bonded together with a sealing material (not shown) so that the liquid crystal sealing region C is formed. In the liquid crystal sealing region C, a liquid crystal material 33 as a liquid crystal composition is injected, filled, and sealed to form a liquid crystal layer 34 as a light modulation layer. The liquid crystal layer 34 is sandwiched and held between the alignment film 14 of the array substrate 2 and the alignment film 31 of the counter substrate 21.

  Here, the liquid crystal material 33 constituting the liquid crystal layer 34 includes a liquid crystal element 35 which is a wide viewing angle liquid crystal having a contrast viewing angle wider than that of twisted nematic (TN) liquid crystal. The liquid crystal element 35 is a multi-domain vertical alignment (MVA) liquid crystal element.

  Further, a rectangular plate-like first retardation plate 36 is laminated and attached to the entire outer surface 30 as the other main surface located outside the glass substrate 22 of the counter substrate 21 of the liquid crystal panel 1. Yes. The first retardation plate 36 is a negative uniaxial retardation plate (C-plate). A rectangular plate-like second phase difference plate 37 is laminated and attached to the entire outer surface of the first phase difference plate 36. The second retardation plate 37 is a positive uniaxial retardation plate (A-plate).

  The first phase difference plate 36 and the second phase difference plate 37 constitute a phase compensation plate 38 as phase difference adjusting means. This phase compensator 38 adjusts the phase difference of the light constituting the image displayed on the outer surface 4 side of the array substrate 2 in the effective pixel region 6 of the liquid crystal panel 1 to widen the viewing angle of this image. This is a phase adjusting means for causing the liquid crystal panel 1 to have a wide viewing angle.

  That is, the phase compensator 38 provides a phase difference between the transmitted light incident from the counter substrate 21 side and transmitted through the liquid crystal layer 34 and the reflected light incident from the array substrate 2 side and reflected by the liquid crystal layer 34. This is a phase compensation element that adjusts and widens the viewing angle of an image displayed in the effective pixel region 6 toward the outer surface 4 side of the array substrate 2. In other words, the phase compensation plate 38 adjusts the phase of light modulated by the liquid crystal element 35 of the liquid crystal layer 34. Specifically, the phase compensator 38 emits light emitted toward the outer surface 4 side of the array substrate 2 of the liquid crystal panel 1 when a predetermined image is displayed on the effective pixel region 6 of the liquid crystal panel 1. Adjust the phase.

  That is, the phase compensator 38 adjusts the phase difference of the light emitted from the entire outer surface 4 of the array substrate 2 so that the viewing angle of the image displayed toward the outer surface 4 of the array substrate 2 is increased. Make it wide. Further, the phase compensation plate 38 is a phase control film that compensates the viewing angle of the liquid crystal panel 1 and is laminated on the outer surface 4 side of the array substrate 2 that is the side on which the subject L of the liquid crystal panel 1 is brought close. The array substrate 2 is collectively arranged only on the outer surface 30 of the counter substrate 21 located on the opposite side of the outer surface 4 of the array substrate 2. In other words, all of the phase compensation plate 38 is laminated and attached to the outer surface 30 side of the counter substrate 21.

  Further, a rectangular flat plate as a polarizer is formed on the entire outer surface located outside the second retardation plate 37 of the phase compensator 38 and the entire outer surface 4 of the glass substrate 3 of the array substrate 2. The polarizing plates 41 and 42 are laminated and pasted. These polarizing plates 41 and 42 have a thickness dimension of, for example, 0.1 mm. Further, on the outer surface located outside the polarizing plate 42 laminated on the outer surface 30 of the counter substrate 21, a back as a planar light source device that makes planar light incident on the entire outer surface of the polarizing plate 42. The inner surface 44 that is one main surface of the light unit 43 is disposed in a state of being horizontally opposed.

  Therefore, the phase compensation plate 38 is provided between the backlight unit 43 and the counter substrate 21. Further, the backlight unit 43 is disposed so as to face the inner surface 5 side of the array substrate 2, and planar light is emitted from the inner surface 44 of the backlight unit 43, so Light is incident on the outer surface of the polarizing plate. That is, the backlight unit 43 is a light source for reading as well as for reading.

  Next, the operation of the flat imaging display device of the first embodiment will be described.

  First, in the case of an imaging mode in which the subject L located opposite to the outer surface 4 of the array substrate 2 of the liquid crystal panel 1 is imaged, the green filter layer 25 among the pixels 7 on the array substrate 2 of the liquid crystal panel 1. Only the pixel 7 in which is stacked is driven to display green (Green) as the first color in the effective pixel region 6 of the liquid crystal panel 1 toward the outer surface 4 side of the glass substrate 3.

  In this state, the image sensor 13 in each pixel 7 provided on the array substrate 2 of the liquid crystal panel 1 receives light that enters the same pixel 7 in which the image sensor 13 is provided. The charge amount of the capacitor is changed according to the amount. The voltage at both ends of these capacitors is detected and processed by the imaging processing circuit, and the subject L is imaged N times. At this time, N is an integer of 2 or more.

  Next, after driving each pixel 7 of the liquid crystal panel 1 is stopped, only the pixel 7 on which the blue filter layer 26 is laminated is driven among the pixels 7 on the array substrate 2 of the liquid crystal panel 1. Blue (Blue: B) as the second color is displayed in the effective pixel region 6 of the liquid crystal panel 1 toward the outer surface 4 side of the glass substrate 3.

  In this state, the subject L is imaged N times in the same manner by the image sensor 13 in each pixel 7 provided on the array substrate 2 of the liquid crystal panel 1. Also at this time, N is an integer of 2 or more.

  Further, after stopping the driving of each pixel 7 of the liquid crystal panel 1, only the pixel 7 on which the red filter layer 27 is laminated is driven among the pixels 7 on the array substrate 2 of the liquid crystal panel 1. Red (Red: R) as the third color is displayed in the effective pixel area 6 of the liquid crystal panel 1 toward the outer surface 4 side of the glass substrate 3.

  In this state, the subject L is imaged N times in the same manner by the image sensor 13 in each pixel 7 provided on the array substrate 2 of the liquid crystal panel 1. Also at this time, N is an integer of 2 or more.

  Then, final image data is generated by the imaging processing circuit on the array substrate 2 on the basis of the imaging results of the imaging elements 13 in a state where these green, blue, and red colors are displayed. Therefore, the subject L located opposite to the outer surface 4 side of the array substrate 2 is imaged by driving the imaging element 13 and the capacitor using electro-optical switching of the liquid crystal layer 34.

  In the display mode in which an image is displayed on the effective pixel region 6 of the liquid crystal panel 1 toward the outer surface 4 side of the array substrate 2, electro-optical switching of the liquid crystal layer 34, that is, effective pixels of the array substrate 2. The potential difference between the pixel electrode 11 and the counter electrode 28 is changed by the display element 12 provided in each pixel 7 in the region 6.

  Then, the change in potential difference between the pixel electrode 11 and the counter electrode 28 drives the liquid crystal element 35 of the liquid crystal layer 34 sandwiched between the pixel electrode 11 and the counter electrode 28, and the liquid crystal By adjusting the inclination of the element 35 and adjusting the amount of light irradiated from the backlight unit 43 and transmitted through each pixel 7, the effective pixel region 6 of the array substrate 2 is placed on the outer surface 4 side of the array substrate 2. A predetermined image is displayed toward.

  Here, in the imaging mode of the liquid crystal panel 1, it is preferable that the subject L is in close contact with the outer surface 4 side that is not in contact with the liquid crystal layer 34 of the array substrate 2 on which the imaging element 13 is provided. That is, the closer the distance A between the imaging element 13 formed on the inner surface 5 of the array substrate 2 that is in contact with the liquid crystal layer 34 and the subject L is, the closer the subject L is to the imaging element 13. The resolution and sensitivity during imaging of the element 13 increase. For this reason, since the subject L can be brought closer to the image sensor 13 by reducing the thickness of the glass substrate 3 constituting the array substrate 2, it is preferable to reduce the thickness of the glass substrate 3 as much as possible.

  On the other hand, when the liquid crystal panel 1 is operated as an RGB light source which is a green, blue and red light source at the time of imaging, or for the purpose of operating the liquid crystal panel 1 as a display device, the array substrate 2 of the liquid crystal panel 1 is used. Polarizing plates 41 and 42 are attached to the outer side surface 4 and the outer side surface 30 of the counter substrate 21, respectively. Therefore, in order to shorten the distance A between the image sensor 13 and the subject L and bring the subject L closer to the image sensor 13, the polarizing plate 41 attached to the outer surface 4 of the array substrate 2 is used. It is preferable to make the thickness as thin as possible similarly to the glass substrate 3.

  Further, in order to realize a wide viewing angle when the liquid crystal panel 1 displays an image, a phase compensation plate 38 is disposed between the glass substrate 22 and the polarizing plate 42 of the counter substrate 21 of the liquid crystal panel 1. Here, in the conventional liquid crystal panel 1 using the liquid crystal element 35 having a general wide viewing angle, the outer surface 4 of the array substrate 2 and the outer surface 30 of the counter substrate 21 of the liquid crystal panel 1 and the polarizing plates 41 and 42. A phase compensation plate 38 is disposed between each of the two. In this case, since the phase compensation plate 38 is interposed between the imaging device 13 of the liquid crystal panel 1 and the subject L by the phase compensation plate 38 disposed on the array substrate 2 side, the imaging device 13 and the subject L The effective distance A between them becomes large, and the resolution and sensitivity at the time of image pickup by these image pickup devices 13 are lowered.

  That is, when a display mode using a conventional liquid crystal element 35 having a wide viewing angle that is generally put into practical use is adopted as the liquid crystal panel 1 having an image capturing function, the imaging element 13 and the subject of the liquid crystal panel 1 are used. Since the polarizing plate 41 and the phase compensation plate 38 laminated on the outer side surface 4 of the array substrate 2 are interposed between L and the liquid crystal panel 1 depending on the thicknesses of the polarizing plate 41 and the phase compensation plate 38, respectively. Thus, the resolution and sensitivity at the time of image pickup by each of the image pickup devices 13 are reduced.

  Therefore, as in the first embodiment described above, the phase compensation plate 38 is collectively arranged only on the outer surface 30 side of the counter substrate 21 of the liquid crystal panel 1, and the outer surface of the array substrate 2 of the liquid crystal panel 1 is arranged. The phase compensation plate 38 is not laminated on the 4 side. As a result, it is possible to suppress an increase in the distance A between the imaging element 13 provided on the inner side surface 5 of the array substrate 2 and the subject L positioned facing the outer side surface 4 of the array substrate 2. . Therefore, the distance A between the image sensor 13 and the subject L can be reduced, and the subject L can be brought closer to the image sensor 13.

  For this reason, since the subject L located opposite to the outer surface 4 side of the array substrate 2 can be imaged by the image sensor 13 without using the phase compensator 38, the outer surface 4 of the array substrate 2 by the phase compensator 38. The subject L can be imaged by the plurality of imaging elements 13 provided on the inner surface 5 of the array substrate 2 without being subjected to phase difference adjustment of the light incident on the array substrate 2. Accordingly, since the phase compensation plate 38 is laminated on the outer surface 4 side of the array substrate 2, it is possible to prevent a decrease in resolution and sensitivity at the time of imaging of the image sensor 13. It can be improved.

  Therefore, the phase compensation plate is used to adjust the phase of light emitted toward the outer surface 4 side of the array substrate 2 when an image is displayed on the effective pixel region 6 by the display element 12 provided on the inner surface 5 of the array substrate 2. The viewing angle of the image can be widened by adjusting at 38, and at the same time, the resolution and sensitivity when the subject L is imaged by the plurality of imaging elements 13 provided on the inner surface 5 of the array substrate 2 can be improved.

  Accordingly, as shown in FIG. 7, as compared with the first comparative example in which the phase compensation plate 38 is laminated on the outer surface 4 of the array substrate 2 of the liquid crystal panel 1, as shown in FIG. Can capture a good image. Further, when the contrast curve (CR viewing angle) of the viewing angle characteristics of the liquid crystal panel 1 having the image pickup device 13 was examined, the liquid crystal panel 1 of the first comparative example using the TN type liquid crystal device 35 shown in FIG. Compared with the contrast curve, it can be confirmed that a wide viewing angle is exhibited as shown in FIG. Therefore, in addition to the wide viewing angle as a display device, the liquid crystal panel 1 having an image capturing function with excellent resolution and sensitivity as an image capturing device can be obtained.

  Further, by arranging the phase compensation plate 38 only on the outer surface 30 side of the counter substrate 21 of the liquid crystal panel 1, the phase compensation plate 38 is not laminated on the outer surface 4 side of the array substrate 2 of the liquid crystal panel 1. Therefore, when the imaging element 13 provided on the inner side surface 5 of the array substrate 2 images the subject L located opposite to the outer side surface 4 of the array substrate 2, it is reflected by the subject L. The phase difference adjustment by the phase compensation plate 38 of the light incident on the pixel electrode 11 can be eliminated. Therefore, it is possible to improve the resolution and sensitivity of the image sensor 13 that images the subject L by photoelectrically converting light incident on the pixel electrodes 11.

  Further, as in the second embodiment shown in FIGS. 4 to 6, for example, WVF (manufactured by Fuji Photo Film Co., Ltd.) is laminated as a phase compensation plate 38 on the outer surface 30 side of the counter substrate 21 of the liquid crystal panel 1. The polarizing plate 42 may be laminated on the phase compensation plate 38. In this case, the alignment films 14 and 31 laminated on the inner side surface 5 side of the array substrate 2 of the liquid crystal panel 1 and the inner side surface 23 side of the counter substrate 21 are positioned outside the alignment films 14 and 31. An alignment control film whose surface is rubbed in a predetermined direction.

  As a result, as shown in FIG. 9, as compared with the second comparative example in which the phase compensation plate 38 is laminated on the outer surface 4 of the array substrate 2 of the liquid crystal panel 1, as shown in FIG. An image with good resolution could be captured. Further, when the contrast curve of the viewing angle characteristic of the liquid crystal panel 1 having the image pickup device 13 was examined, it was compared with the contrast curve of the liquid crystal panel 1 of the second comparative example using the TN type liquid crystal device 35 shown in FIG. As shown in FIG. 6, it was confirmed that a wide viewing angle was exhibited. Therefore, in addition to the wide viewing angle as a display device, the liquid crystal panel 1 having an image capturing function with excellent resolution and sensitivity as an image capturing device can be obtained.

  In each of the above embodiments, the liquid crystal element 35 in the liquid crystal layer 34 of the liquid crystal panel 1 is a multi-domain vertical alignment liquid crystal element. However, a TN + WVF liquid crystal element in which a phase compensation plate is added to a twisted nematic liquid crystal element. Other wide viewing angle liquid crystal elements having a wide contrast viewing angle, such as liquid crystal elements and homogenous alignment liquid crystal elements, can be used correspondingly.

  That is, as the wide viewing angle liquid crystal mode of the liquid crystal panel 1, it is preferable to use a liquid crystal driving method such as a TN + WVF mode, an MVA mode, a homogeneous mode, or an OCB (Optical Compensated Birefringence :) mode. In the wide viewing angle liquid crystal mode in which the phase compensation plate 38 can be collectively arranged on the side opposite to the image capturing side, it can be used correspondingly.

  Further, as the phase compensation plate 38 used in the liquid crystal panel 1 in the wide viewing angle liquid crystal mode, stretched films such as ZEONOR (registered trademark), modified polycarbonate, triacetylrose (TAC), and coating films of liquid crystalline polymers are used. For example, a negative uniaxial retardation plate (C-plate) or a positive uniaxial retardation plate (A-plate) may be used.

  In addition, the display element 12 and the imaging element 13 are separately formed in each pixel 7 on the array substrate 2 of the liquid crystal panel 1, but the display element 12 and the imaging element 13 are formed as one integrated semiconductor element. Even if it is provided in each pixel 7, it can be used correspondingly. At this time, it is also possible to provide the image pickup elements 13 only at predetermined intervals between the pixels 7 without providing the image pickup elements 13 in the respective pixels 7.

  Further, the pixel electrode 11 in each pixel 7 of the liquid crystal panel 1 is driven by the display element 12 constituted by a thin film transistor to display an image. However, for example, a switching element such as a thin film diode can be used. Can be used. Further, in addition to the liquid crystal panel 1 in which the light modulation layer is the liquid crystal layer 34, a flat imaging display device such as an electroluminescence (EL) display device can be used correspondingly.

It is explanatory sectional drawing which shows a part of 1st Embodiment of the flat imaging display apparatus of this invention. It is a top view which shows the resolution of the image imaged with the plane imaging display apparatus same as the above. It is a graph which shows CR viewing angle of a flat imaging display apparatus same as the above. It is explanatory sectional drawing which shows a part of 2nd Embodiment of the flat imaging display apparatus of this invention. It is a top view which shows the resolution of the image imaged with the plane imaging display apparatus same as the above. It is a graph which shows CR viewing angle of a flat imaging display apparatus same as the above. It is a top view which shows the resolution of the image imaged with the plane imaging display apparatus of the 1st comparative example. It is a graph which shows CR viewing angle of a flat imaging display apparatus same as the above. It is a top view which shows the resolution of the image imaged with the plane imaging display apparatus of the 2nd comparative example. It is a graph which shows CR viewing angle of a flat imaging display apparatus same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid crystal panel as planar imaging display device 3 Glass substrate as translucent substrate 6 Effective pixel area as display area 7 pixels
12 Display elements as display means
13 Image sensor as imaging means
34 Liquid crystal layer as light modulation layer
38 Phase compensator as phase adjustment means
43 Backlight unit as planar light source L Subject as subject

Claims (3)

A translucent substrate having a display area;
A plurality of pixels provided in a matrix in the display region of the translucent substrate;
Display means provided in at least one of these pixels and displaying at least one of the wavelength and amount of light transmitted through the translucent substrate to display an arbitrary image in the display area;
An imaging unit that is provided in at least one of the pixels and that captures an imaging target located opposite to one principal surface of the translucent substrate;
A flat imaging display device comprising: phase adjusting means that is attached only to the other main surface side of the light transmitting substrate and adjusts the phase of light transmitted through the light transmitting substrate. It is disposed on the other main surface side of the translucent substrate, and includes a planar light source that irradiates the other main surface of the translucent substrate with planar light,
The flat imaging display apparatus according to claim 1, wherein the phase adjusting means is located between the other main surface of the translucent substrate and the planar light source. Comprising a light modulation layer provided between one principal surface of the translucent substrate and the phase adjusting means;
The flat imaging display apparatus according to claim 1, wherein the phase adjusting unit adjusts a phase of light modulated by the light modulation layer.

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