JP2010224425A - Display panel with built-in optical sensor and display device using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display panel with a built-in optical sensor by which exact sensing corresponding to light at various incident angles or a display device using the same. <P>SOLUTION: The display panel with the built-in optical sensor has an active matrix substrate 100 having a pixel area in which pixels are arranged like a matrix, and at least a part of the pixel area, an optical sensor part 4 is formed. The optical sensor part 4 includes: an opening surface 7 provided on the surface of at least a part of the pixel area; a photosensitive part 6 which detects light penetrating the opening surface 7 to be made incident; and a light shielding part 5 which is provided at a part of an area between the opening surface 7 and the photosensitive part 6 and formed by extending in a direction perpendicular to the opening surface 7. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The disclosure of the present application relates to a display panel with a built-in photosensor that includes a photodetection element such as a photodiode in a pixel and can be used as a scanner or a touch panel, and a display device using the display panel.

  2. Description of the Related Art Conventionally, a display device with an image capturing function that can capture an image of an object close to a display by providing a photodetection element such as a photodiode in a pixel region has been proposed (for example, patents). Reference 1). The light detection elements in the pixel region are formed at the same time when well-known components such as signal lines, scanning lines, TFTs (Thin Film Transistors), and pixel electrodes are formed on the active matrix substrate by a well-known semiconductor process. The Such a display device with an image capturing function is assumed to be used as, for example, a display device for bidirectional communication or a display device with a touch panel function.

  The light detection element in the pixel region may detect light having various incident angles. For this reason, it is preferable that the optical sensor incorporated in the display device with an image capturing function can accurately detect not only light incident vertically but also light incident obliquely. Therefore, an optical sensor in which a condensing lens is provided on the light source side of the photodetector has been proposed (see, for example, Patent Document 1). In this optical sensor, a cylindrical surface substantially parallel to the optical axis passing through the center of the lens is provided in a part of the condenser lens. As a result, the incident angle dependency of the amount of light detected by the optical sensor is reduced.

Japanese Patent Laid-Open No. 2-112735

  However, the configuration using the condensing lens is suitable for capturing light having a large incident angle. For example, the light for detecting that the light to the photosensitive portion is shielded by a finger or a pen. Not suitable for sensors. Therefore, the present invention provides a display panel with a built-in photosensor or a display device using the photosensor capable of accurate sensing corresponding to light of various incident angles even in a photosensor capable of sensing light shielding. For the purpose.

  The display panel with a built-in photosensor disclosed in the present application is a display panel with a built-in photosensor having a pixel region in which pixels are arranged in a matrix and having a photosensor portion formed in at least a part of the pixel region. The optical sensor unit includes an opening surface provided on at least a part of the surface of the pixel region, a photosensitive unit that detects light incident through the opening surface, and a gap between the opening surface and the photosensitive unit. And a light shielding portion that blocks a part of the light incident from the opening surface.

  In the above-described configuration, a part of light perpendicularly incident from the opening surface is blocked by the light shielding portion provided between the opening surface and the photosensitive portion and does not reach the photosensitive portion. For this reason, when the opening surface is blocked by a shielding object such as a finger or a pen, leakage light that enters the opening surface obliquely from the gap of the shielding object and reaches the photosensitive portion is less likely to be irradiated over the entire surface of the photosensitive portion. . For this reason, the amount of leakage light detected by the photosensitive portion is suppressed. As a result, the difference between the amount of light reaching the photosensitive portion when the aperture surface is shielded and the amount of light reaching the photosensitive portion when the aperture surface is not shielded can be increased. As a result, even in an optical sensor capable of detecting light shielding, it becomes easy to distinguish between light and dark, and accurate detection corresponding to light of various incident angles becomes possible.

  In an embodiment of the present invention, the light shielding portion may be provided so as to surround a space above a central portion of the photosensitive portion. As a result, when the aperture surface is not blocked, the light incident from the aperture surface reaches the central portion of the photosensitive portion. However, when the aperture surface above the central portion of the photosensitive portion is blocked, the leak incident obliquely from the aperture surface. The light is blocked by the light blocking portion and does not reach the central portion of the photosensitive portion. Therefore, the amount of light incident obliquely can be suppressed without significantly reducing the amount of light incident perpendicularly to the aperture surface. The central part of the photosensitive part is the central part of the area where light is detected.

  In an embodiment of the present invention, it is preferable that the light shielding portion has a side surface extending in a direction perpendicular to the opening surface and an upper surface parallel to the opening surface. With the above configuration, light that is incident obliquely on the opening surface (light that is not incident at 0 degrees) is easily blocked by the light shielding portion. For this reason, light having an incident angle larger than 0 degrees is difficult to reach the photosensitive portion. That is, the incident angle of light detected by the photosensitive portion can be more effectively limited.

  In an embodiment of the present invention, it is preferable that the light shielding portion is disposed at a position where a distance between the photosensitive portion and the upper surface of the light shielding portion is shorter than a distance between the opening surface and the upper surface. As a result, it is possible to effectively block light that is incident on the opening surface at an angle and reaches the photosensitive portion.

  In an embodiment of the present invention, the light-sensitive portion has a rectangular plane that detects light, is perpendicular to the opening surface, and is a cross section in a plane parallel to at least one side of the rectangular plane. , Having a first light-shielding region and a second light-shielding region adjacent to each other across a central region above the center of the photosensitive portion, and the first light-shielding region and the second light-shielding region are perpendicular to the opening surface. The first light-shielding region includes one end of the opening surface in the cross-section and both ends of the photosensitive portion. The second light-shielding region is formed at a position overlapping with a line passing through the longer end from one end of the surface, and the second light-shielding region includes the other end of the opening surface in the cross section and both ends of the photosensitive portion. Among them, the distance from the other end of the opening surface is long The side boundary on the central region side of the first light-shielding region is formed at a position overlapping with a line passing through the end of the first light-shielding region, and the center of the upper-surface boundary of one end of the opening surface and the second light-shielding region The side boundary on the central region side of the second light-shielding region is formed between the one end of the opening surface and the upper surface boundary of the second light-shielding region. It is preferably formed at a position intersecting with a line connecting the end on the central region side. As a result, the light shielding portion can more reliably block light incident obliquely from the edge of the opening surface from reaching the photosensitive portion.

  In an embodiment of the present invention, a counter substrate facing the active matrix substrate with a liquid crystal layer interposed therebetween is provided, the opening surface is provided on the counter substrate side, and the photosensitive portion and the light shielding portion are on the active matrix substrate side. It is preferable to be provided. Thereby, a liquid crystal display panel with a built-in optical sensor is obtained. Note that a display device including the above-described display panel with a built-in optical sensor is also included in the embodiment of the present invention.

  According to the present invention, even in an optical sensor for detecting light shielding, accurate detection corresponding to light of various incident angles can be performed.

FIG. 1 is a top view of a pixel region for one pixel in an active matrix substrate of the display panel with a built-in photosensor according to the present embodiment. FIG. 2 is an enlarged view of the photosensor portion in the pixel region shown in FIG. FIG. 3 is a cross-sectional view taken along the line A-A ′ in FIG. 2. FIG. 4 is a diagram for explaining a preferred arrangement of the light shielding portions. FIG. 5 is a diagram illustrating an incident state of leakage light when no light shielding unit is provided. FIG. 6 is a diagram illustrating an incident state of leakage light when a light shielding portion is provided. (A)-(e) is a figure for demonstrating the manufacturing process of the light-shielding part shown in FIG. It is sectional drawing which shows the modification of a light-shielding part. FIG. 9 is a top view of the modification shown in FIG. FIG. 10 is a top view showing another modification of the light shielding portion. FIG. 11 is a top view showing still another modified example of the light shielding portion. FIG. 12 is a top view showing still another modification of the light shielding portion.

  Hereinafter, more specific embodiments of the present invention will be described with reference to the drawings. The following embodiment shows a configuration example when the display device according to the present invention is implemented as a liquid crystal display device. However, the display device according to the present invention is not limited to the liquid crystal display device, and is in a matrix form. The present invention can be applied to an arbitrary display device (for example, an EL display device) using a substrate on which pixels are arranged. Further, the display device according to the present invention has an image capturing function, thereby detecting an object close to the screen and performing an input operation, a scanner for reading an image of a document or the like placed on the screen, Alternatively, it can be used as a bidirectional communication display device having a display function and an imaging function.

  For convenience of explanation, the drawings referred to below show only the main members necessary for explaining the present invention in a simplified manner among the constituent members of the embodiment of the present invention. Therefore, the display device according to the present invention can include arbitrary constituent members that are not shown in the drawings referred to in this specification. Moreover, the dimension of the member in each figure does not represent the dimension of an actual structural member, the dimension ratio of each member, etc. faithfully.

[Configuration of display panel with built-in optical sensor]
First, the configuration of the display panel with a built-in optical sensor included in the liquid crystal display device according to the embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 is a top view of a pixel region 1 for one pixel in the display panel with a built-in optical sensor according to the present embodiment. FIG. 2 is an enlarged view of the photosensor portion in the pixel region 1 shown in FIG. FIG. 3 is a cross-sectional view taken along the line A-A ′ in FIG. 2.

  As shown in FIG. 1, the pixel region 1 for one pixel includes a pixel opening 2 and an optical sensor unit 4. In the present embodiment, one photosensor unit 4 is provided in each pixel. A plurality of pixels as shown in FIG. 1 are arranged in a matrix in the display panel with a built-in photosensor.

  On the upper surface of the photosensor built-in display panel, the pixel aperture 2 and the aperture surface of the photosensor unit 4 are surrounded by a black matrix 3. The aperture surfaces of the pixel aperture 2 and the optical sensor unit 4 are formed of a layer that transmits light, such as a color filter, for example. That is, in the optical sensor unit 4, the layer formed on the upper surface that transmits this light is the opening surface.

  Referring to FIG. 2, when the optical sensor unit 4 is viewed from above, an area surrounded by the black matrix 3 is an opening surface 7 through which light is transmitted. The photosensitive portion 6 is provided at a position overlapping in the direction perpendicular to the opening surface 7. A light shielding portion 5 is formed in a part of the space between the opening surface 7 and the photosensitive portion 6.

  Referring to FIG. 3, the display panel with a built-in optical sensor includes an active matrix substrate 100, a counter substrate 200, and a liquid crystal 10 sandwiched therebetween. That is, the active matrix substrate 100 is bonded to the counter substrate 200 on the entire surface, and the liquid crystal 10 is sealed in the gap.

  In the counter substrate 200, a color filter layer including the black matrix 3 and the color filter 8, a counter electrode 9 such as ITO, and the like are formed on a glass substrate (not shown). In the active matrix substrate 100, the silicon film 17, the insulating films 15 and 16, the planarization film 12, the pixel electrode 11, and the like are formed on a glass substrate (not shown). The pixel electrode 11 can also be formed of ITO. In FIG. 3, the alignment film is not shown. In addition to the film shown in FIG. 3, a film may be appropriately formed.

  The pixel electrode 11 is driven by, for example, a TFT (not shown). A gate electrode (gate wiring) 14 and a source wiring (source electrode) 13 for transmitting a signal for driving the pixel electrode 11 via the TFT are provided on the insulating films 15 and 16, respectively.

  The flattening film 12 is a film for flattening a region (a surface in contact with the liquid crystal 10) sandwiching the liquid crystal 10. By flattening the region sandwiching the liquid crystal 10, the viewing angle of the liquid crystal can be widened. The light shielding part 5 is embedded in the planarizing film 12.

  The light-shielding part 5 is preferably formed of a material that hardly transmits light and is also difficult to reflect. For example, it is preferable to form the light shielding portion 5 with an organic film having a high OD (Optical Density) value, but the light shielding portion 5 can also be formed with a metal film.

  The light shielding portion 5 is provided between the opening surface 7 and the photosensitive portion 6 and blocks a part of light incident from the opening surface. In the example shown in FIGS. 2 and 3, the light shielding portion 5 is formed so as to surround the central space 20 above the central portion 6 a of the photosensitive portion 6. In the central space 20 surrounded by the light shielding portion 5, light can be transmitted. The central portion 6a of the photosensitive portion 6 is near the center in the light detection region.

  The light shielding portion 5 includes a side surface perpendicular to the opening surface 7 and a top surface and a bottom surface horizontal to the opening surface 7. Furthermore, it is preferable that the light shielding unit 5 is provided at a position where the distance between the upper surface of the light shielding unit 5 and the photosensitive unit 6 is shorter than the distance between the upper surface of the light shielding unit 5 and the opening surface 7. In the present embodiment, the light shielding unit 5 is provided on the active matrix substrate 100 side in order to shorten the distance between the light shielding unit 5 and the photosensitive unit 6.

  In the photosensor unit 4 of the active matrix substrate 100, a photodiode that is a photodetection element of the photosensor unit 4 is formed by the silicon film 17. In the example shown in FIG. 3, the photodiode is a lateral structure PIN diode, and is arranged in order along the surface direction, a p-type semiconductor region (p layer) 17a, an intrinsic semiconductor region (i layer) 17b, And an n-type semiconductor region (n layer) 17c. In the present embodiment, the photosensitive region 6 is formed from the p-i junction to the n-i junction. In other words, the photosensitive portion is a portion that detects light in the light detection element. In the present embodiment, the “intrinsic semiconductor region” may be a region that is electrically neutral compared to the adjacent p-type semiconductor region and n-type semiconductor region, and does not contain any impurities, for example. It is preferable that the region or the region where the conduction electron density and the hole density are equal.

  When incident light from the opening surface 7 reaches the photosensitive portion 6, a current flows between the anode and cathode of the photodiode in accordance with the amount of incident light. The function of the optical sensor is realized by detecting the amount of electric charge flowing between the anode and the cathode by a circuit in the subsequent stage. For example, an output circuit (not shown) that extracts and outputs electric charges due to conduction between the anode and cathode of a photodiode is formed for each pixel.

  In the subsequent circuit, for example, whether or not the opening surface is shielded can be determined based on whether or not the amount of electric charge flowing between the anode and the cathode exceeds a threshold value in a certain time. Specifically, the opening surface 7 is shielded when the amount of charge is reduced by a predetermined amount on the basis of the amount of charge flowing between the anode and cathode of the photodiode when the opening surface 7 is fully open. Judgment can be made.

  A transmissive liquid crystal display device is configured by installing a backlight (not shown) on the back of the display panel with a built-in optical sensor having the pixel region shown in FIGS. Although not shown here, a pair of polarizing plates functioning as a polarizer and an analyzer, various optical compensation films, and the like may be disposed on both surfaces of the display panel with a built-in optical sensor. In FIG. 3, the internal structure of the display panel with a built-in optical sensor is enlarged to show the structure in an easy-to-understand manner.

[Configuration example of light-shielding part]
FIG. 4 is a diagram for explaining a preferred arrangement of the light shielding portions. FIG. 4 shows a plane perpendicular to the opening surface 7 and the boundary line between the p layer (first semiconductor region) and the i layer (intrinsic semiconductor region) and the n layer (second semiconductor region) of the photodiode. It is sectional drawing in a surface perpendicular | vertical outside the boundary line of i and i layer.

  Note that the cross section shown in FIG. 4 can be said to be a cross section of a plane perpendicular to the opening surface 7 and parallel to the forward direction of the photodiode. Further, the photosensitive portion 6 (i layer) is rectangular, and the cross section can be said to be a cross section parallel to one side of the rectangle. In the cross section shown in FIG. 4, the ends C and D of the opening surface 7 are boundaries between the color matrix 8 and the black matrix 3. One end A of the photosensitive portion 6 is a boundary between the i layer 17b and the n layer 17c, and the other end B of the photosensitive portion 6 is a boundary between the i layer 17b and the n layer 17c.

  In the present embodiment, since the light shielding portion is formed so as to surround the central space 20 above the central portion 6a of the photosensitive portion 6, in the cross section shown in FIG. 1, 5-2. Moreover, since the light shielding part 5 has a side surface perpendicular to the opening surface 7 and a top surface and a bottom surface horizontal to the opening surface 7, the light shielding region 5-1 and the light shielding region 5-2 in the cross section shown in FIG. An upper surface boundary and a bottom surface boundary boundary parallel to the opening surface 7 and a side surface boundary perpendicular to the opening surface 7 are provided.

  In the example shown in FIG. 4, at the position overlapping the line passing through the end C on the p-layer 17 a side of the opening surface 7 and the end B far from the end C of the opening surface 7 among the both ends AB of the photosensitive portion 6. A light shielding region 5-2 is arranged. Similarly, the light shielding region 5-1 is disposed at a position overlapping with a line passing through the end D on the n layer 17c side of the opening surface 7 and the end A far from the end D among both ends AB of the photosensitive portion 6. The

  Thus, by determining the position of the light shielding region so that the light shielding region overlaps the line passing through the end of the opening 7 and the end of the photosensitive portion 6 on the opposite side, light incident obliquely from the opening 7 can be obtained. It is possible to effectively avoid hitting the entire surface of the photosensitive portion 6. Further, the upper surface boundaries of the light shielding regions 5-1 and 5-2 are arranged so that the straight line CB intersects with the upper surface boundary IJ of the light shielding region 5-2 and the straight line DA intersects with the upper surface boundary EF of the light shielding region 5-1. By doing so, the light incident obliquely from the opening 7 can be effectively blocked.

  Furthermore, in the example shown in FIG. 4, the side boundary IK in contact with the central space 20 of the light shielding region 5-2 is the end C on the p layer 17a side of the opening 7 and the central space 20 side of the upper surface of the light shielding region 5-1. Is formed at a position that intersects the line CF passing through the end F of the. The side boundary FH in contact with the central space 20 of the light shielding region 5-1 is a line DI passing through the end D of the opening 7 on the n layer 17c side and the end I of the upper surface of the light shielding region 5-2 on the central space 20 side. It is formed at the intersecting position. In this way, the position of the side boundary in contact with the central space 20 of one light shielding region is a line passing through the end of the opening on the other light shielding region side and the end on the central region side of the upper surface of the other light shielding region. It can arrange | position in the position which cross | intersects the said side surface boundary. Thereby, it is possible to effectively block the light incident obliquely on the central region from the end of the opening 7 from hitting the photosensitive portion 6.

  FIG. 5 is a diagram illustrating an incident state of leakage light when the light shielding unit 5 is not provided, and FIG. 6 is a diagram illustrating an incident state of leakage light when the light shielding unit 5 is provided. 5 and 6 show an example in which the opening surface 7 is blocked by a shield 18 such as a finger or a pen. In the example shown in FIG. 5, the leaked light that has entered from the portion of the opening surface 7 that is not covered with the shield 18 hits the entire photosensitive portion 6. On the other hand, in the example shown in FIG. 6, part of the leaked light is blocked by the light blocking portion 5 and does not reach the photosensitive portion 6. Therefore, only the part M of the photosensitive portion 6 is exposed to leaked light. As described above, by providing the light shielding portion 5, the irradiation range of the leaked light to the photosensitive portion 6 is narrowed. Further, compared to the range N1 of incident light that can reach the photosensitive portion 6 when there is no light shielding portion 5 (in the case shown in FIG. 5), it reaches the photosensitive portion 6 when there is the light shielding portion 5 (in the case shown in FIG. 6). The range of incident light N2 to be obtained is narrower.

  As described above, the range of the incident angle of the incident light reaching the photosensitive unit 6 is limited, so that the photosensitive unit 6 is exposed in a state where it is blocked by the shielding object 18 and in a state where it is not blocked. The difference in light intensity increases. As a result, for example, when detecting darkness due to the shielding of the shielding object 18 with respect to a normal state (bright) where there is no shielding object, it becomes easy to distinguish between light and dark, so that the malfunction of the optical sensor due to leakage light is suppressed. The

  For example, even if the user intends to completely cover the opening surface 7 with a finger or the like, there are many cases where there is a gap. When such an incomplete shielding of the opening surface 7 is made, if there is no light shielding portion 5, depending on the characteristics such as the photosensitivity of the photodiode and the amount of incident light, the leaked light hits the photosensitive portion 6 and the photodiode. A current flows through and it is determined that there is no shielding. That is, the place where the shielding state should be detected as an optical sensor remains in the normal state. This is mainly due to the difference in the amount of light exposure in the photosensitive portion 6 between the incomplete shielding of the opening surface 7 and the opening of the entire opening surface 7.

  On the other hand, as in the present embodiment, by providing the light-shielding portion 5 on the planarizing film 12 between the opening surface 7 and the photosensitive portion 6, leakage light at the time of incomplete shielding is applied to the photosensitive portion 6 of the photodiode. It becomes difficult to reach. For this reason, the difference in the amount of light in the photosensitive portion 6 becomes large when the opening surface 7 is incompletely shielded and when the entire surface is opened. As a result, malfunction of the optical sensor can be suppressed.

  In order to increase the difference in the amount of exposure between when the entire surface is opened and when it is incompletely shielded, it is preferable that the amount of exposure when the opening surface 7 is fully opened is large. Therefore, it is preferable that the light shielding unit 5 is arranged so as not to block the light to the photosensitive unit 6 as much as possible when the entire surface is opened, and to block the light to the photosensitive unit 6 as much as possible when incompletely blocked. As an example of an appropriate arrangement for that purpose, in the present embodiment, the light shielding portion 5 is provided so as to surround the space above the central portion of the photosensitive portion 5, and extends to the side surface and the opening surface 7 extending in a direction perpendicular to the opening surface 7. It has a parallel upper surface. Moreover, it is preferable to provide the light shielding part 5 at a position as close to the photosensitive part 6 as possible from the viewpoint of efficiently blocking light leaking during incomplete shielding. Furthermore, the arrangement of the light-shielding part 5 in consideration of the positions of both ends of the opening 7 and the positions of both ends of the photosensitive part 6 enables appropriate arrangement.

  In addition, arrangement | positioning of the said light shielding area | region 5-1 and 5-2 shown in the cross section of FIG. 4 is a suitable example, and does not necessarily need to be the arrangement | positioning which satisfy | fills said conditions. For example, when emphasis is placed on securing the amount of light detected by the photosensitive unit 5 when the opening 7 is fully opened, the upper surfaces of the light shielding regions 5-1 and 5-2 can be narrowed and the central space 20 can be widened.

  In addition, how much the incident angle of light at the time of incomplete shielding is limited by the light shielding unit 5 can be determined according to the sensitivity of the photosensitive unit 6 and other conditions, for example. For example, the cross-sectional area of the top surface or the bottom surface of the light shielding portion 5, the length in the direction perpendicular to the opening surface 7, the width of the central space, or the like can be determined according to the sensitivity of the photosensitive portion 6. If the photosensitive portion 6 is a photodiode, the sensitivity of the photosensitive portion can be considered as, for example, light energy that leads to conduction between the anode and the cathode.

[Manufacturing process]
FIG. 7 is a diagram for explaining a manufacturing process of the light shielding portion 5 shown in FIG. In the example shown in FIG. 7, a concave shape is formed when the planarizing film 12 is formed, a resin material is poured therein, and the surface is washed with alkali to form the light shielding portion 5. In addition, the manufacturing process of the light-shielding part 5 is not restricted to the example of FIG.

  In the example shown in FIG. 7, first, a silicon film 17, an insulating film 16, a gate wiring 14, an insulating film 15, and a source wiring 13 are formed in order from the bottom, and a planarizing film 12 is applied thereon (FIG. 7 ( a)). Next, the planarizing film 12 is processed (FIG. 7B). That is, the concave portions 12 a and 12 b for forming the light shielding portion 5 are formed in the planarizing film 12. Here, as an example, recesses 12a and 12b having a rectangular cross section are formed. A resin material for forming the light shielding portion 5 is poured into the recesses 12a and 12b (FIG. 7C). Thereafter, excess resin material on the surface of the planarizing film 12 is removed by alkali cleaning (FIG. 7D). The resin material remaining in the planarizing film 12 becomes the light shielding portion 5. On the planarizing film 12, ITO is formed as the pixel electrode 11 (FIG. 7E). Further, by forming other necessary films such as an alignment film (not shown), the active matrix substrate 100 (TFT side substrate) is completed.

(Modification 1 of light shielding part)
FIG. 8 is a cross-sectional view showing a modification of the light shielding portion. FIG. 9 is a plan view showing the modification. The light shielding parts 50a and 50b shown in FIGS. 8 and 9 have a shape in which the light shielding part 5 shown in FIGS. The light shielding part 50 a is formed so as to surround the central space 20 with a wall perpendicular to the opening surface 7. The light shielding part 50 b is formed so as to surround the light shielding part 50 b and the outer space 19 with a wall perpendicular to the opening surface 7. That is, the light shielding part of the present modification is formed so as to surround the central space 20 twice. Thus, while increasing the amount of light that vertically enters and reaches the photosensitive portion 6 when the aperture surface 7 is opened, the amount of light that enters obliquely and reaches the photosensitive portion 6 when the aperture surface 7 is incompletely shielded is reduced. Can be reduced.

(Modification 2 of light shielding part)
FIG. 10 is a top view showing another modification of the light shielding portion. The light shielding portion 51 shown in FIG. 10 is formed in a cylindrical shape extending in a direction perpendicular to the opening surface 7. That is, the light shielding part 51 is formed as a wall (circular prism) surrounding the central region 20 on the cylinder. In the example shown in FIG. 10, the cross-sectional shape in the plane parallel to the opening surface 7 of the light shielding portion 51 is not a perfect circle but an ellipse. The oblateness of the ellipse may be determined according to, for example, the ratio between the vertical and horizontal dimensions of the opening surface 7 (black matrix 3). Note that the cross-sectional shape of the light shielding portion 51 is substantially the same as that in FIG.

(Modification 3 of light shielding part)
FIG. 11 is a top view showing still another modified example of the light shielding portion. The light shielding portion 52 shown in FIG. 11 is formed so as to surround an area where light is transmitted by a plurality of square pillars extending in a direction perpendicular to the opening surface 7. In this way, the light shielding portion can be formed by a combination of a plurality of columns. The cross-sectional shape of the light shielding portion 52 shown in FIG. 11 is also substantially the same as that in FIG. In addition, a light transmissive material may be embedded in the center of each of the plurality of pillars. This can increase the amount of light that enters perpendicularly when the opening surface 7 is fully open and reaches the photosensitive portion 6, and can block light incident obliquely from reaching the photosensitive portion 6 during incomplete shielding. it can.

(Modification 4 of light shielding part)
FIG. 12 is a top view showing still another modification of the light shielding portion. In the modification, the light shielding portions 53 a, the central space 20, and the light shielding portions 53 b are formed so as to be arranged in a line on a plane parallel to the opening surface 7. That is, quadrangular prism light-shielding portions 53 a and 53 b extending in a direction perpendicular to the opening surface 7 are provided at positions sandwiching the central space 20 from both sides. As described above, by arranging the light shielding portion so as to sandwich the central space in one direction, it is possible to make it difficult for light leaked when the opening surface 7 is incompletely shielded to reach the photosensitive portion 6. The cross-sectional shapes of the light shielding portions 53a and 53b are the same as those in FIG.

  As mentioned above, although one Embodiment about this invention was described, this invention is not limited only to the above-mentioned specific example, A various change is possible within the scope of the invention.

  For example, in the above embodiment, the light shielding part 5 is provided in the planarizing film 12, but the position where the light shielding part 5 is provided is not limited to the planarizing film 12. For example, the light shielding portion 5 may be provided in the insulating films 15 and 16.

  Moreover, in the said embodiment, although the light-shielding part is provided so that it may penetrate the planarization film | membrane 12, it does not necessarily need to penetrate. For example, the light shielding portion can be formed by forming a hole that does not penetrate the planarizing film 12 and pouring a resin material into the hole. Further, the light shielding portion is not necessarily provided on the active matrix substrate 100, and may be provided on the counter substrate 200, for example. Further, the arrangement of the light shielding portion is not limited to the case of surrounding the central space, and for example, a configuration in which the light shielding portion is provided in the central portion may be employed.

  Further, the optical sensor unit 4 is not necessarily provided in all pixels. For example, the optical sensor unit may be formed every other row or every other column.

  The photodiode is not limited to the lateral structure PIN diode shown in the above embodiment. For example, the same effect can be obtained even when a PN diode, an avalanche photodiode, a GaAsP photodiode, an InP photodiode, or the like is used instead of the photodiode.

DESCRIPTION OF SYMBOLS 1 Pixel region 2 Pixel opening part 3 Black matrix 4 Optical sensor part 5, 50, 51, 52 Light-shielding part 6 Photosensitive part 7 Opening surface 8 Color filter 9 Counter electrode 10 Liquid crystal 11 Pixel electrode 12 Flattening film 12a, 12b Recessed part 13 Source Wiring 14 Gate wiring 15 Insulating film 16 Insulating film 17 Silicon film 18 Shielding object 100 Active matrix substrate 200 Counter substrate

Claims (7)

A display panel with a built-in photosensor having a pixel region in which pixels are arranged in a matrix, and having a photosensor portion formed in at least a part of the pixel region,
The optical sensor unit is
An opening surface provided on at least a part of the surface of the pixel region;
A photosensitive part that detects light incident through the aperture;
A display panel with a built-in optical sensor, comprising: a light-shielding portion that is provided between the opening surface and the photosensitive portion and blocks a part of light incident from the opening surface.   The display panel with a built-in optical sensor according to claim 1, wherein the light shielding portion is provided so as to surround a space above a central portion of the photosensitive portion.   3. The display panel with a built-in optical sensor according to claim 1, wherein the light shielding portion has a side surface extending in a direction perpendicular to the opening surface and an upper surface parallel to the opening surface.   The said light-shielding part is arrange | positioned in the position in which the distance of the said photosensitive part and the said upper surface of the said light-shielding part becomes shorter than the distance of the said opening surface and the said upper surface. The display panel with a built-in optical sensor. The photosensitive part has a rectangular plane for detecting light,
In a cross section in a plane perpendicular to the opening surface and parallel to at least one side of the rectangular plane,
The light-shielding portion has a first light-shielding region and a second light-shielding region that are adjacent to each other with a central region above the center of the photosensitive portion interposed therebetween,
The first light-shielding region and the second light-shielding region have a side surface boundary extending in a direction perpendicular to the opening surface, and an upper surface boundary perpendicular to the side surface,
The first light-shielding region overlaps with a line passing through one end of the opening surface in the cross section and an end of the photosensitive portion having a longer distance from one end of the opening surface. Formed into
The second light-shielding region includes a line passing through the other end of the opening surface in the cross section and an end of the photosensitive portion having a longer distance from the other end of the opening surface. Formed in overlapping positions,
The side boundary on the central region side of the first light shielding region is formed at a position that intersects a line connecting one end of the opening surface and the end on the central region side of the upper surface boundary of the second light shielding region. And
The side boundary on the central region side of the second light shielding region is formed at a position where a line connecting one end of the opening surface and the end on the central region side of the upper surface boundary of the second light shielding region is formed. The display panel with a built-in optical sensor according to any one of claims 1 to 4. A counter substrate facing the active matrix substrate via a liquid crystal layer;
The opening surface is provided on the counter substrate side,
The display panel with a built-in photosensor according to claim 1, wherein the photosensitive portion and the light shielding portion are provided on the active matrix substrate side.   The display apparatus containing the display panel with a built-in optical sensor of any one of Claims 1-6.

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