JP2008233789A - Liquid crystal display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inhibit degradation of display grade by inhibiting light leakage of a light source, in a liquid crystal display for displaying, by controlling the luminance of a light source, depending on the luminance of outside light. <P>SOLUTION: A display area A1 where a plurality of pixels 10P are arranged and a non-display area A2 surrounding the display area A1 are arranged in a liquid crystal display device, in which a liquid crystal layer LC 1 is sandwiched between a first transparent substrate 10 and a second transparent substrate 20. A photodetector 30 is arranged in the non-display area A2, and a light-shielding layer 21, having an opening 21A, is arranged in an area superposed with the photodetector 30. The liquid crystal layer LC1 that is an area, extending from the display area A1 and superimposed with the opening 21A is sandwiched between a transparent electrode 14B and a common electrode 24 extending to the opposite position, and a voltage is applied to the transparent electrode 14B so as to constantly keep a black display inside the opening 21. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device that performs display by controlling the luminance of a light source in accordance with the luminance of external light.

  As one of liquid crystal display devices, a liquid crystal display device that controls the luminance of a light source, that is, the luminance of a backlight in accordance with the luminance of external light is known. The configuration of such a liquid crystal display device will be described below with reference to the drawings.

  FIG. 14A is a schematic plan view showing a liquid crystal display device according to a conventional example, and a first transparent substrate 10 constituting the liquid crystal display device and a first transparent substrate 10 disposed opposite to the first transparent substrate 10. Of the two transparent substrates 20, a schematic configuration on the first transparent substrate 10 is shown as an equivalent circuit diagram. FIG. 14B shows a schematic plan view when the second transparent substrate 20 is viewed from the upper surface thereof.

  As shown in FIG. 14A, in the display area A1 of the first transparent substrate 10 made of glass or the like, a plurality of pixels 10P are arranged in an area surrounded by the pixel selection signal line GL and the display signal line DL. Yes. Each pixel 10P is turned on or off according to a pixel selection signal supplied from the vertical drive circuit DR1 to the pixel selection signal line GL, and a display signal supplied from the horizontal drive circuit DR2 to the display signal line DL is supplied to the liquid crystal layer LC. A pixel transistor TR to be applied to and a holding capacitor CS for holding a display signal for a certain period are arranged.

  On the other hand, a terminal portion 10T such as an FPC (Flexible Printed Circuit) having a plurality of terminals for connection to an external circuit is disposed in the non-display area A2 where the pixels 10P are not disposed, that is, the frame.

  The non-display area A2 of the first transparent substrate 10 includes a light receiving element 30 that senses external light and outputs a current corresponding to the luminance, and a detection circuit (not shown) that detects the output current. Has been placed. The light receiving element 30 is composed of a PIN diode having a polysilicon layer, a MOS transistor, or the like.

  As shown in FIG. 14B, the second transparent substrate 20 made of glass or the like has an opening 21A that is a non-formation region in a region that covers the non-display region A2 and overlaps the light receiving element 30. The light shielding layer 21 that is provided, that is, the black matrix is arranged.

  FIG. 15 shows a cross-sectional configuration of the liquid crystal display device in the vicinity of the opening 21A and the light receiving element 30 along the line XX in FIG. A first polarizing plate PL <b> 1 is disposed on one surface of the first transparent substrate 10. Under the first polarizing plate PL1, a backlight module 12 that is a light source is disposed via an adhesive layer 12A.

  The light receiving element 30 and the pixel transistor TR are disposed on the other surface of the first transparent substrate 10. A planarizing film 13 is disposed so as to cover these. In the display area A1 on the planarizing film 13, a pixel electrode 14A made of a transparent metal such as ITO (Indium Tin Oxide) is applied to each pixel 10P to which a display signal is applied. The pixel electrode 14 </ b> A is covered with the first alignment film 115. The pixel electrode 14 </ b> A and the first alignment film 115 may extend slightly beyond the display area A <b> 1 depending on the process conditions, but do not extend on the light receiving element 30.

  On one surface of the second transparent substrate 20, a second polarizing plate PL2 having a light transmission axis perpendicular to the light transmission axis of the first polarizing plate PL1 is disposed. On the other surface of the second transparent substrate 20, a light shielding layer 21 having an opening 21 </ b> A in a region overlapping the light receiving element 30 in the non-display region A <b> 2 is disposed. External light enters the light receiving element 30 from the second transparent substrate 20 side through the opening 21A.

  In addition, in the display area A1 of the second transparent substrate 20, a color filter 22 and a light shielding layer BM that is a black matrix are arranged corresponding to each pixel 10P. These are covered with a planarizing film 23. On the planarizing film 23 in the display area A1, a common electrode 124 made of a transparent metal such as ITO and connected to a common potential is disposed. The common electrode 124 is covered with the second alignment film 125. The common electrode 124 and the second alignment film 125 may extend slightly beyond the display region A1 depending on the process conditions, but do not extend over the opening 21A of the light shielding layer 21.

  The first transparent substrate 10 and the second transparent substrate 20 are bonded to each other through a seal layer 29 disposed on the outer edge portion thereof, and a liquid crystal layer LC composed of, for example, nematic liquid crystal molecules is sandwiched between them. ing. The liquid crystal layer LC extends from the display area A1 to the non-display area A2.

  In this liquid crystal display device, when external light enters the light receiving element 30 through the opening 21A, the light receiving element 30 outputs a current corresponding to the luminance of the external light, and the current value is detected by the detection circuit 40. Based on this current value, the luminance of the light emitted from the backlight module 12 is controlled.

  Thus, by optimizing the luminance of the light from the backlight module 12 according to the luminance of the external light, the visibility of the liquid crystal display device can be improved and the power consumption can be reduced.

Note that a liquid crystal display device that performs display by controlling the luminance of a light source according to the luminance of external light is described in Patent Document 1.
JP 2006-201221 A

  However, in the liquid crystal display device described above, in the region overlapping with the opening 21A of the light shielding layer 21, the alignment direction of the liquid crystal molecules of the liquid crystal layer LC is indefinite, so that part of the light from the backlight module 12 is transmitted. . In other words, the light emitted from the backlight module 12 leaks from the opening 21A of the light shielding layer 21 to the viewer side, which causes a problem that display quality is deteriorated.

  In view of this, in the liquid crystal display device that performs display by controlling the luminance of the light source in accordance with the luminance of the external light, the present invention suppresses the light quality of the light source and suppresses the deterioration of display quality.

  The liquid crystal display device of the present invention includes a first transparent substrate, a second transparent substrate, a first transparent substrate, and a second transparent substrate each having a display region in which a plurality of pixels are arranged and a non-display region surrounding the display region. Between the transparent substrate and the liquid crystal layer extending from the display region to the non-display region, the first polarizing plate disposed on the first transparent substrate, and the second transparent substrate. A second polarizing plate, a light receiving element arranged on the first transparent substrate in the non-display area, and a non-formation area in an area overlapping with the light receiving element arranged on the second transparent substrate in the non-display area. The liquid crystal molecules are aligned in a non-formation region so that black display is controlled.

  According to such a configuration, black display is performed in the region where the light shielding layer is not formed, so that leakage of light from the light source can be suppressed and display quality deterioration can be suppressed.

  According to the liquid crystal display device of the present invention, it is possible to suppress leakage of light from the light source and suppress deterioration in display quality.

  A first embodiment of the present invention will be described with reference to the drawings. The schematic planar configuration of the liquid crystal display device is the same as that shown in FIGS. 14A and 14B. A detailed configuration will be described with reference to FIGS. 1 and 2.

  FIG. 1 is an enlarged plan view for explaining the liquid crystal display device according to the present embodiment. In the vicinity of the light receiving element 30 in FIG. 14A and the opening 21A of the light shielding layer 21 in FIG. Only the components are shown. FIG. 2 is a cross-sectional view taken along line AA in FIG.

  In FIG. 1 and FIG. 2, the same components as those shown in FIG. 14A, FIG. 14B, and FIG. Specifically, in this liquid crystal display device, configurations other than the liquid crystal layer LC1, the first alignment film 15, the common electrode 24, and the second alignment film 25 are the same as those in FIGS. Since the same configuration as that shown in FIG. 15 is included, description of those components is omitted.

  In the non-display area A <b> 2 of the first transparent substrate 10, a transparent electrode 14 </ b> B made of a transparent metal such as ITO is disposed so as to cover the area overlapping the light receiving element 30 on the planarizing film 13.

  The transparent electrode 14B is covered with the first alignment film 15 together with the pixel electrode 14A in the display area A1. That is, the first alignment film 15 extends over the light receiving elements 30 in the display area A1 and the non-display area A2.

  In the second transparent substrate 20, on the planarizing film 23, the display region A1 and the non-display region A2 that cover the region overlapping the opening 21A of the light shielding layer 21 are covered with a common potential made of a transparent metal such as ITO. A connected common electrode 24 extends. The common electrode 24 is covered with a second alignment film 25 extending from the display area A1 to the non-display area A2. The rubbing directions of the first alignment film 15 and the second alignment film 25 are orthogonal to each other.

  In addition, the liquid crystal layer LC1 sandwiched between the first transparent substrate 10 and the second transparent substrate 20 via the seal layer 29 is composed of nematic liquid crystal molecules that are twisted and have a positive dielectric anisotropy. That is, the liquid crystal molecules are aligned according to the rubbing direction of the first alignment film 15 and the second alignment film 25 and controlled by a so-called TN (Twisted Nematic) mode. The liquid crystal layer LC1 extends from the display area A1 to a region overlapping with the light receiving element 30 and the light shielding layer opening 21A in the non-display area A2.

  In the display area A1, in each pixel 10P, when the pixel transistor TR is turned on in response to the pixel selection signal, a display signal is applied to the pixel electrode 14A, the orientation direction of the liquid crystal molecules in the liquid crystal layer LC1 is controlled, and display is performed. . In the present embodiment, since the liquid crystal layer LC1 is controlled by the TN mode, the white color is normally white when no voltage is applied to the pixel electrode 14A.

  On the other hand, a voltage corresponding to black display is always applied to the transparent electrode 14B in the non-display area A2 regardless of the level of the display signal. This voltage is applied using the lowest voltage among the voltages supplied to the pixel 10P, the vertical drive circuit DR1, the horizontal drive circuit DR2, etc., for example, the low level potential of the pixel selection signal. Thereby, in the liquid crystal layer LC1 on the transparent electrode 14B, that is, on the light receiving element 30, an electric field is always generated in the normal direction of the common electrode 24, and liquid crystal molecules rise along the electric field. Since the liquid crystal molecules in this orientation direction transmit light from the backlight module 12 linearly polarized by the first polarizing plate PL1 without rotating, the light transmission axis is orthogonal to the first polarizing plate PL1. Absorbed by the second polarizing plate PL2. That is, black display is always performed in the opening 21A of the light shielding layer 21, and light from the backlight module 12 can be prevented from leaking to the viewer side through the opening 21A. Accordingly, it is possible to suppress a decrease in display quality due to light leakage from the opening 21A.

  Since the external light incident on the second transparent substrate 20 is linearly polarized only by the second polarizing plate PL2, it enters the light receiving element 30 through the opening 21A of the light shielding layer 21. The light receiving element 30 outputs a current corresponding to the luminance of the incident external light, and the current value is detected by the detection circuit 40 and fed back to the backlight module 12. The backlight module 12 irradiates light having the optimum luminance for display according to the luminance of the external light.

  In addition, as long as the liquid crystal layer LC1 of this embodiment is composed of liquid crystal molecules having positive dielectric anisotropy, other modes such as STN (Super-Twisted Nematic) mode, ECB (Electrically Controlled), and the like. It may have a configuration controlled by a birefringence mode or the like.

  Below, the 2nd Embodiment of this invention is described, referring drawings. FIG. 3 is a cross-sectional view illustrating the liquid crystal display device according to the present embodiment. The configuration of the liquid crystal display device is the same as that of the first embodiment except for the liquid crystal layer LC2, the first alignment film 15V, and the second alignment film 25V. This liquid crystal layer LC2 is composed of nematic liquid crystal molecules having homeotropic alignment, that is, vertical alignment and negative dielectric anisotropy, and is controlled by a VA (Vertically Aligned) mode. The first alignment film 15V and the second alignment film 25V are vertical alignment films for homeotropic alignment of liquid crystal molecules.

  In the display area A1, in each pixel 10P, when the pixel transistor TR is turned on in response to the pixel selection signal, a display signal is applied to the pixel electrode 14A, the orientation direction of the liquid crystal molecules in the liquid crystal layer LC1 is controlled, and display is performed. . In the present embodiment, since the liquid crystal layer LC2 is controlled by the VA mode, the black color is normally black when no voltage is applied to the pixel electrode 14A.

  On the other hand, regardless of the level of the display signal, a potential corresponding to black display, that is, a voltage having the same potential as the common potential of the common electrode 24 is always applied to the transparent electrode 14B in the non-display area A2. Thereby, in the liquid crystal layer LC2 on the transparent electrode 14B, that is, on the light receiving element 30, a state where no electric field is generated is always maintained, and a state where the liquid crystal molecules are standing is maintained. The liquid crystal molecules in this orientation direction transmit the light from the backlight module 12 linearly polarized by the first polarizing plate PL1 as it is, so that the second light transmission axis is orthogonal to the first polarizing plate PL1. Absorbed by polarizing plate PL2. That is, black display is always performed in the opening 21A of the light shielding layer 21, and light from the backlight module 12 can be prevented from leaking to the viewer side through the opening 21A. Accordingly, it is possible to suppress a decrease in display quality due to light leakage from the opening 21A. Other operations are the same as those in the first embodiment.

  The third embodiment of the present invention will be described below with reference to the drawings. The schematic planar configuration of the liquid crystal display device is the same as that shown in FIGS. 14A and 14B. A detailed configuration will be described with reference to FIGS.

  FIG. 4 is an enlarged plan view for explaining the liquid crystal display device according to this embodiment. In the vicinity of the light receiving element 30 in FIG. 14A and the opening 21A of the light shielding layer 21 in FIG. Only the components are shown. FIG. 5 is a sectional view taken along line BB in FIG.

  In the second embodiment, the liquid crystal display device has a configuration in which the transparent electrode 14B does not exist in the non-display area A2 and the common electrode 24 does not extend. That is, only the first alignment film 15 </ b> V and the second alignment film 25 </ b> V extend on the planarizing films 13 and 23 in a region overlapping with the opening 21 </ b> A of the light receiving element 30 and the light shielding layer 21. Yes. In this region, the liquid crystal molecules are always kept standing by the alignment regulating force of the first alignment film 15V and the second alignment film 25V.

  As a result, as in the second embodiment, black display is always performed in the opening 21A of the light shielding layer 21, and light from the backlight module 12 can be prevented from leaking to the viewer through the opening 21A. Accordingly, it is possible to suppress a decrease in display quality due to light leakage from the opening 21A. Other operations are the same as those in the second embodiment.

  The fourth embodiment of the present invention will be described below with reference to the drawings. The schematic planar configuration of the liquid crystal display device is the same as that shown in FIGS. 14A and 14B. A detailed configuration will be described with reference to FIGS.

  FIG. 6 is an enlarged plan view for explaining the liquid crystal display device according to the present embodiment. In the vicinity of the light receiving element 30 in FIG. 14A and the opening 21A of the light shielding layer 21 in FIG. Only the components are shown. FIG. 7 is a cross-sectional view taken along the line CC of FIG.

  In the third embodiment described above, noise caused by the operation of the pixel transistor TR in the display area A1 may affect the light receiving element 30 in some cases. As a countermeasure against this noise, in this embodiment, a transparent electrode 14C made of a transparent metal such as ITO is disposed on the planarizing film 13 of the first transparent substrate 10 so as to cover a region overlapping the light receiving element 30. ing. The transparent electrode 14 </ b> C is connected to a DC fixed potential, and suppresses the influence of the noise on the light receiving element 30. Other configurations and operations are the same as those in the third embodiment.

  The fifth embodiment of the present invention will be described below with reference to the drawings. The schematic planar configuration of the liquid crystal display device is the same as that shown in FIGS. 14A and 14B. A detailed configuration will be described with reference to FIGS.

  FIG. 8 is an enlarged plan view for explaining the liquid crystal display device according to the present embodiment. In the vicinity of the light receiving element 30 in FIG. 14A and the opening 21A of the light shielding layer 21 in FIG. Only the components are shown. FIG. 9 is a cross-sectional view taken along the line DD of FIG. FIG. 10 is a plan view for explaining the pixel electrode 14A, the transparent electrode 14B, and the common electrodes 17A and 17B of FIG.

  8 to 9, the same components as those shown in FIGS. 14A, 14B, and 15 are referred to with the same reference numerals. Specifically, in this liquid crystal display device, configurations other than the liquid crystal layer LC3, the insulating film 16, the first alignment film 15F, the common electrodes 17A and 17B, and the second alignment film 25F are shown in FIG. Since the same configuration as that shown in FIGS. 14B and 15 is included, only the main components among those components will be described.

  The liquid crystal layer LC3 of the liquid crystal display device is controlled by a transverse electric field mode in which the alignment direction of liquid crystal molecules changes along an electric field substantially parallel to the first transparent substrate 10, for example, FFS (Fringe-Field Switching) mode.

  In the display area A <b> 1 of the first transparent substrate 10, the pixel electrode 14 </ b> A is disposed on the planarizing film 13. In one non-display area A2, a transparent electrode 14B made of a transparent metal such as ITO is disposed so as to cover the area overlapping the light receiving element 30 on the planarizing film 13.

  The transparent electrode 14B is covered with an insulating film 16 together with the pixel electrode 14A in the display area A1. In the display area A1 on the insulating film 16, a common electrode 17A made of a transparent metal such as ITO and overlapping with each pixel electrode 14A and having a plurality of slit portions and linear portions and connected to a common potential is disposed. (See FIG. 10). Also in the non-display area A2 on the insulating film 16, a common electrode 17B made of a transparent metal such as ITO and overlapping with the transparent electrode 14B and having a plurality of slit portions and linear portions and connected to a common potential is disposed. (See FIG. 10).

  The insulating film 16 and the common electrodes 17A and 17B are covered with the first alignment film 15F. That is, the first alignment film 15F extends over the light receiving elements 30 in the display area A1 and the non-display area A2.

  In the second transparent substrate 20, the second alignment film 25 </ b> F extends on the planarizing film 23 so as to cover a region overlapping the opening 21 </ b> A of the light shielding layer 21 in the display region A <b> 1 and the non-display region A <b> 2. . The rubbing directions of the first alignment film 15F and the second alignment film 25F are parallel to each other.

  The liquid crystal layer LC3 sandwiched between the first transparent substrate 10 and the second transparent substrate 20 via the seal layer 29 is composed of nematic liquid crystal molecules that are homogeneously aligned and have positive dielectric anisotropy. The liquid crystal layer LC3 extends from the display area A1 to a region overlapping with the light receiving element 30 and the opening 21A of the light shielding layer in the non-display area A2.

  In the display area A1, in each pixel 10P, when the pixel transistor TR is turned on according to the pixel selection signal, a display signal is applied to the pixel electrode 14A, and between the pixel electrode 14A and the common electrode 17A according to the display signal. The orientation of the liquid crystal molecules in the liquid crystal layer LC3 is controlled by an electric field generated substantially parallel to the first transparent substrate 10, and display is performed. The liquid crystal layer LC3 of the present embodiment is normally black, which displays black when no voltage is applied to the pixel electrode 14A. As an example, the initial alignment of the liquid crystal molecules coincides with the light transmission axis of the first polarizing plate PL1 and is orthogonal to the light transmission axis of the second polarizing plate PL2.

  On the other hand, in the non-display area A2, a potential corresponding to black display, that is, a voltage having the same potential as the common potential of the common electrodes 17A and 17B is always applied regardless of the level of the display signal. Thus, the liquid crystal layer LC3 on the transparent electrode 14B, that is, the light receiving element 30, is always kept in a state where no electric field is generated, and the orientation direction of the liquid crystal molecules is kept in a black display.

  The liquid crystal molecules in this orientation direction are absorbed by the second polarizing plate PL2 whose light transmission axes are orthogonal to transmit the light from the backlight module 12 linearly polarized by the first polarizing plate PL1 without rotating the light. The That is, black display is always performed in the opening 21A of the light shielding layer 21, and light from the backlight module 12 can be prevented from leaking to the viewer side through the opening 21A. Accordingly, it is possible to suppress a decrease in display quality due to light leakage from the opening 21A. Since the external light incident on the second transparent substrate 20 is linearly polarized only by the second polarizing plate PL2, it enters the light receiving element 30 through the opening 21A of the light shielding layer 21. Other operations are the same as those in the first embodiment.

  The sixth embodiment of the present invention will be described below with reference to the drawings. The schematic planar configuration of the liquid crystal display device is the same as that shown in FIGS. 14A and 14B. A detailed configuration will be described with reference to FIGS.

  FIG. 11 is an enlarged plan view for explaining the liquid crystal display device according to this embodiment. In the vicinity of the light receiving element 30 in FIG. 14A and the opening 21A of the light shielding layer 21 in FIG. Only the components are shown. 12 is a cross-sectional view taken along line EE in FIG.

  In the fifth embodiment, the liquid crystal display device has a configuration in which the transparent electrode 14B does not exist in the non-display area A2 and the common electrode 17B does not extend. That is, only the first alignment film 15 </ b> F and the second alignment film 25 </ b> F extend on the planarizing films 13 and 23 in a region overlapping with the opening 21 </ b> A of the light receiving element 30 and the light shielding layer 21. Yes. In this region, the liquid crystal molecules are always maintained in the alignment direction corresponding to black display by the alignment regulating force of the first alignment film 15F and the second alignment film 25F.

  Accordingly, as in the fifth embodiment, black display is always performed in the opening 21A of the light shielding layer 21, and light from the backlight module 12 can be prevented from leaking to the viewer through the opening 21A. Accordingly, it is possible to suppress a decrease in display quality due to light leakage from the opening 21A. Other operations are the same as those in the fifth embodiment.

  The seventh embodiment of the present invention will be described below with reference to the drawings. The schematic planar configuration of the liquid crystal display device is the same as that shown in FIGS. 14A and 14B. A detailed configuration will be described with reference to FIG.

  FIG. 13 is a cross-sectional view illustrating the liquid crystal display device according to the present embodiment, and shows the same positions as in FIGS. 9 and 12.

  In the sixth embodiment described above, noise caused by the operation of the pixel transistor TR in the display area A1 may affect the light receiving element 30 in some cases. As a countermeasure against this noise, in this embodiment, a transparent electrode 14C made of a transparent metal such as ITO is disposed on the planarizing film 13 of the first transparent substrate 10 so as to cover a region overlapping the light receiving element 30. ing. The transparent electrode 14 </ b> C is connected to a DC fixed potential, and suppresses the influence of the noise on the light receiving element 30. Other configurations and operations are the same as those in the sixth embodiment.

  Note that the liquid crystal layer LC3 of the fifth to seventh embodiments described above may be in other modes, for example, as long as the liquid crystal molecules are controlled by an electric field generated substantially parallel to the first transparent substrate 10. You may have the structure controlled by IPS (In-Plane Switching) mode.

1 is an enlarged plan view illustrating a liquid crystal display device according to a first embodiment of the present invention. It is sectional drawing explaining the liquid crystal display device concerning the 1st Embodiment of this invention. It is sectional drawing explaining the liquid crystal display device concerning the 2nd Embodiment of this invention. It is an enlarged plan view explaining the liquid crystal display device concerning the 3rd Embodiment of this invention. It is sectional drawing explaining the liquid crystal display device concerning the 3rd Embodiment of this invention. It is an enlarged plan view explaining the liquid crystal display device concerning the 4th Embodiment of this invention. It is sectional drawing explaining the liquid crystal display device concerning the 4th Embodiment of this invention. It is an enlarged plan view explaining the liquid crystal display device concerning the 5th Embodiment of this invention. It is sectional drawing explaining the liquid crystal display device concerning the 5th Embodiment of this invention. It is a top view explaining the pixel electrode of the liquid crystal display device concerning the 5th Embodiment of this invention, a transparent electrode, and a common electrode. It is an enlarged plan view explaining the liquid crystal display device concerning the 6th Embodiment of this invention. It is sectional drawing explaining the liquid crystal display device concerning the 6th Embodiment of this invention. It is sectional drawing explaining the liquid crystal display device concerning the 7th Embodiment of this invention. It is the equivalent circuit schematic and schematic plan view explaining the liquid crystal display device concerning a prior art example. It is sectional drawing along the XX line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 1st transparent substrate 10P Pixel 10T Terminal part 12 Backlight module 13, 23 Flattening film | membrane 14A Pixel electrode 14B, 14C Transparent electrode 15, 15V, 15F, 115 1st alignment film 16 Insulating film 17A, 17B Common electrode 20 Second transparent substrate 21, BM Light shielding layer 21A Opening 22 Color filter 24, 124 Common electrodes 25, 25V, 25F, 125 Second alignment film 30 Light receiving element 40 Detection circuit A1 Display area A2 Non-display area DR1 Vertical drive circuit DR2 Horizontal drive circuit TR Pixel transistor CS Retention capacitance LC, LC1, LC2, LC3 Liquid crystal layer

Claims (6)

A first transparent substrate and a second transparent substrate having a display area in which a plurality of pixels are arranged and a non-display area surrounding the display area;
A liquid crystal layer sandwiched between the first transparent substrate and the second transparent substrate and extending from the display region to the non-display region;
A first polarizing plate disposed on the first transparent substrate;
A second polarizing plate disposed on the second transparent substrate;
A light receiving element disposed on the first transparent substrate in the non-display area;
A light-shielding layer disposed on the second transparent substrate in the non-display region and having a non-formation region in a region overlapping with the light receiving element,
In the non-formation region, the alignment of liquid crystal molecules of the liquid crystal layer is controlled so that black display is performed. A first transparent electrode disposed in a region between the light receiving element and the liquid crystal layer and overlapping the non-forming region;
A second transparent electrode disposed between the second transparent substrate and the liquid crystal layer and in a region overlapping with the non-formation region,
The liquid crystal display device according to claim 1, wherein a voltage corresponding to black display is applied to the first transparent electrode and the second transparent electrode. A first transparent electrode and a second transparent electrode disposed in a region between the light receiving element and the liquid crystal layer and overlapping with the non-formation region,
The liquid crystal display device according to claim 1, wherein a voltage corresponding to black display is applied to the first transparent electrode and the second transparent electrode.   The liquid crystal layer includes the display region that displays white when no electric field is applied, and different voltages are applied to the first transparent electrode and the second transparent electrode, respectively. The liquid crystal display device according to claim 2 or 3.   The display region has a black display when an electric field is not applied to the liquid crystal layer, and a voltage having the same potential is applied to the first transparent electrode and the second transparent electrode. The liquid crystal display device according to claim 2 or 3. A first alignment film disposed in a region between the light receiving element and the liquid crystal layer and overlapping the non-formation region;
A second alignment film disposed between the second transparent substrate and the liquid crystal layer and in a region overlapping with the non-formation region,
By controlling the alignment direction of the liquid crystal molecules of the liquid crystal layer sandwiched between the alignment films by the alignment regulating force of the first alignment film and the second alignment film, black display is performed in the non-formation region. The liquid crystal display device according to claim 1.

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