JP2006323199A - Photosensor-integrated liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a photosensor-integrated liquid crystal display device that maximizes the external light reaching the photodetection section and has a large proportion occupied by the image display section. <P>SOLUTION: A photodetection layer of a photodetection element and a photodetection aperture formed in a color filter substrate satisfy the conditions that one side of the photodetection aperture is extended over an end of the photodetection layer in a horizontal direction outward the photodetection layer, by a length larger than a value of Formula (1) and smaller than a value of Formula (2); where d<SB>1</SB>, d<SB>2</SB>, d<SB>3</SB>to d<SB>N</SB>represent the thicknesses of the respective layers between the photodetection layer of the photodetection element and the photodetection aperture of the color filter substrate, n<SB>1</SB>, n<SB>2</SB>, n<SB>3</SB>to n<SB>N</SB>represent the effective refractive indices of the respective layers, n<SB>A</SB>is the refractive index of the space between an observer and the liquid crystal display apparatus, and ±S represents the alignment precision between the photodetection layer and the photodetection aperture. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an optical sensor for detecting a position using light or detecting an amount of light, and more particularly to an optical sensor integrated liquid crystal display device.

  Conventionally, a liquid crystal display device described in Patent Documents 1 to 3 is provided as a liquid crystal display device with a built-in light detection touch panel that includes a light sensor that detects the amount of light in a matrix and detects a position when light is blocked by a finger or the like. There is.

Japanese Patent Laid-Open No. 2002-075732 W. den Boer et al., SID'03 (Baltimore) p.1494-1497. A. Abileah et al., SID'04 P.1544-1547.

  In the conventional photosensor-integrated liquid crystal display device using light, the size of the opening of the light detection unit has not been clearly defined. Increasing the size of the opening sufficiently allows external light to reach the photodetecting element. However, if the opening is too large, the ratio of the image display unit decreases, leading to a decrease in image quality. .

  It is an object of the present invention to obtain a photosensor-integrated liquid crystal display device that maximizes the external light reaching the light detection unit and has a large ratio of the image display unit.

より大きくし

より小さいことを特徴とするものである。 An optical sensor integrated liquid crystal display device according to the present invention includes:
In a liquid crystal display device comprising a color filter substrate, a TFT array substrate, and a liquid crystal layer sandwiched between the substrates, and a photodetection element disposed on the TFT array substrate, the photodetection layer of the photodetection element and the color filter substrate are provided. d ₁ of each of the thickness of each layer between the obtained light detection _{opening, d 2, d 3, ···} d n, an effective refractive index _{n 1, n 2, n 3} , ··· n n When the refractive index between the observer and the liquid crystal display device is n _A, and the alignment accuracy between the light detection layer and the light detection portion opening is ± S, one of the light detection portion openings is From the edge of the photodetection layer horizontally outside the photodetection layer

Bigger

It is characterized by being smaller.

より大きくし

より小さくしたことにより、光検出層に対する外光の入射効率を最大値にすることができる。また、表示開口部のエリア減少を最低限に抑えることが可能となる。
また光検出層は金属材料からなることが多いため、光検出部開口部を外側から見た際に視認性低下があるが、光検出部開口部のサイズを必要最小限とすることでその影響を小さくすることができる。 According to the present invention, one of the light detection unit openings is horizontally outward from the light detection layer from an end of the light detection layer.

Bigger

By making it smaller, the incident efficiency of external light with respect to the light detection layer can be maximized. In addition, it is possible to minimize the area reduction of the display opening.
In addition, since the photodetection layer is often made of a metal material, there is a decrease in visibility when the photodetection unit opening is viewed from the outside. Can be reduced.

Embodiment 1 FIG.
FIG. 1 shows an example of a plan view of a display area when viewed from the front side of a general liquid crystal panel. A dotted line indicates one pixel. The size of one pixel is, for example, 300 μm × 300 μm. Reference numerals 101, 102, and 103 denote red, green, and blue pixels, respectively, and a display image can be obtained by making these portions brighter or darker. Reference numeral 104 denotes a non-display portion which is generally made to appear black and is called a black matrix in that case. As the material, a CrO / Cr multilayer film is often used so that it looks black when viewed from the front side, but a black resin or the like is sometimes used. A material that hardly transmits light is used. A ratio of the display units 101, 102, and 103 to the whole is called a display aperture ratio.

  FIG. 2 shows an example of a plan view of a display area when a liquid crystal panel in which a light detecting element is arranged for each pixel is viewed from the front side. The light detection unit 105 surrounded by a one-dot chain line is arranged by reducing the arrangement area of red, green, and blue pixels, and a hole is formed in a part of the black matrix to form a light detection unit opening 106. It is necessary to reduce the display aperture ratio in order to arrange the light detection unit in the same plane as the pixel, but this causes a reduction in luminance, leading to a reduction in display performance. Therefore, if the size of the entire photodetection unit or the photodetection unit opening is made as small as possible, image quality degradation can be minimized. Note that the number of light detection units may be one for each pixel as in the example, or may be one for a plurality of pixels. Conversely, a plurality of pixels may be arranged in one pixel. It is also possible to use it as a light quantity sensor as a single display screen. Note that the light detection unit may include a reading element in addition to the light detection element.

  FIG. 3 shows a schematic cross-sectional view of an example in which the position of a transmission type liquid crystal panel with a built-in light detection element is detected using external light. 10 is a polarizing plate, 11 is a front side glass substrate, 12 is a front side light shielding body, 30 is a backlight, 40 is a polarizing plate, 41 is a back side glass substrate, 42 is a liquid crystal, 43 is a back side light shielding body, 44 is a light detection layer, 401 Is a liquid crystal driving element. The front-side light shielding body 12 is formed on the front-side glass substrate 11, and the back-side light shielding body 43, the light detection layer 44, and the liquid crystal driving element 401 are formed on the back-side glass substrate 41. The liquid crystal 42 is arranged in a state of being sandwiched between the front glass substrate 11 and the back glass substrate 41. Note that the alignment film and signal wiring are omitted. As shown in FIG. 3, the display image is obtained when the light emitted from the backlight 30 passes through the liquid crystal 42 and exits to the front side. The liquid crystal 42 and the two polarizing plates serve as an optical switch. External light reaches the photodetection layers 44a and 44c, but there is a light blocking body above the photodetection layer 44b so that external light does not enter. The position can be detected by detecting the difference between the two states. Here, the case where external light is shielded has been described, but the position may be detected by using a light pen to detect a difference between a place exposed to strong light by the light pen and a place not exposed to light. Further, although the position detection has been described as an example, the absolute value of the light amount may be detected. The material of the front side glass substrate 11 and the back side glass substrate 41 may be plastic instead of glass.

  FIG. 4 shows a relationship diagram between the light detection layer 44 and the light detection unit opening 51 provided in the front-side light blocking body 12. For ease of explanation, it is assumed that only the liquid crystal layer exists between the light detection layer 44 and the light detection portion opening 51, and the effective refractive index (hereinafter referred to as the refractive index) is 1.6. The refractive index of the front glass substrate 11 and the polarizing plate is 1.6, and the refractive index of the atmosphere is 1.0. The distance d between the light detection layer 44 and the light detection part opening 45 is 5.0 μm. A place where the front-side light blocking body 12 does not exist is a light detection unit opening 45.

Here, consider a case where light enters the light detection layer from the surface. Light enters and refracts between the atmosphere and the liquid crystal according to Snell's law. That is, the following relationship is established between the refractive index n _i on the incident side and the incident angle θ _i , and the refractive index n _j on the outgoing side and the outgoing angle θ _j .
n _i sin θ _i = n _j sin θ _j

In order to make light incident on the light detection layer 44 most effectively, the light detection portion opening 51 may be set so that light having an incident angle of 90 degrees is incident on the light detection layer 44.
In this case, since all the refractive indexes of the internal members are set to 1.6, n _i = 1, θ _i when the light enters the medium of n = 1.6 at an angle of 90 degrees from the medium of n = 1. When θ _{j is obtained} with = 90 degrees and n _j = 1.6, 39 degrees is obtained. In order for light from 90 degrees to enter the upper end of the photodetection layer 44, the horizontal distance between the end of the front-side light blocking body 12 and the end of the photodetection layer 44 is greater than x = d × tan θ _j. Is required. As described above, since θ _j = 39 degrees in calculation, x = 4 μm. In order for all the external light from the front side to enter the photodetection layer 44, it is only necessary to satisfy x ≧ 4 μm in all directions.

  Further, consider the alignment accuracy S between the front glass substrate 11 and the back glass substrate 41. If the alignment accuracy is ± S μm, in order to make the value of x always larger than 4 μm, if the design value of x is 4 + S μm, the range of x after completion is 4 ≦ x ≦ 4 + 2 × S Therefore, the amount of light entering the light detection layer 44 can always satisfy the maximum value, and the maximum value of the size can be defined, so that the reduction of the display area can be minimized.

Here, the above-mentioned definition of x may be all four directions, top, bottom, left, and right, or only a specific direction. In particular, normal outside light is incident from the upper side and the components from other directions are small. Therefore, only the upper portion when the liquid crystal panel is installed satisfies the above relationship, and the lower side is in a horizontal direction with the light detection layer 44. Even if they are designed to be the same, the same effect can be obtained. Specifically, if the upper design value is 4 + S and the lower design value is 0 + S, the upper value is in the range of 4-4 + 2 × S, and the lower value is in the range of 0-2 × S. When the light source is on the upper side, the incident efficiency of external light can be close to 100%.
Here, the value of S is determined by the overlay accuracy of the front glass substrate and the back glass substrate. The standard error is 3σ = 4 μm, where σ is the standard deviation. Therefore, the range of x in the above case is 4 to 12 μm.

より大きいことが必要となる。また、位置合わせ精度Ｓを考慮し、一般式で書き表すと、下記のとおりとなる。

より大きく、かつ

より小さければよいことになる。 Finally, generalize the value of x. x is a numerical value determined by a substance existing between the light detection layer 44 and the light detection unit opening 51. In practice, not only the liquid crystal layer but also various layers are interposed between the light detection layer 44 and the light detection portion opening 51. The substance present therebetween, respectively the effective refractive index and _{thickness, n 1, n 2, n} 3, ··· n N d 1, d 2, d 3, when a · · · _{d N,} the air If the effective refractive index is n _A ,
n ₁ sin θ ₁ = n ₂ sin θ ₂ = n ₃ sin θ ₃ =... = n _N sin θ _N
The distance x in the horizontal direction from the ends of the front-side light shield 12 and the light detection layer 44 is

It needs to be larger. In addition, in consideration of the alignment accuracy S, the general expression is as follows.

Bigger and

Smaller is better.

  In a transmissive liquid crystal panel, there are various insulating films between the light detection element and the light detection unit opening, an alignment film for aligning the liquid crystal in a specific direction when no voltage is applied, a liquid crystal, a transparent electrode, a color filter layer, etc. The range of x is determined by the effective refractive index and film thickness of all these layers.

より大きくし

より小さくしたことにより、光検出層に対する外光の入射効率を最大値にすることができる。また、表示開口部のエリア減少を最低限に抑えることが可能となる。
また光検出層は金属材料からなることが多いため、光検出部開口部を外側から見た際に視認性低下があるが、光検出部開口部のサイズを必要最小限とすることでその影響を小さくすることができる。 According to this embodiment, one of the light detection unit openings is horizontally outward from the light detection layer from the end of the light detection layer.

Bigger

By making it smaller, the incident efficiency of external light with respect to the light detection layer can be maximized. In addition, it is possible to minimize the area reduction of the display opening.
In addition, since the photodetection layer is often made of a metal material, there is a decrease in visibility when the photodetection unit opening is viewed from the outside. Can be reduced.

  Further, by forming the light detection unit opening in the black matrix, the opening can be formed at low cost.

Embodiment 2. FIG.
5 and 6 show examples of the transmissive liquid crystal panel according to this embodiment. The cross section of the liquid crystal panel shown in FIG. 5 corresponds to FIG. Signal lines and the like are omitted. A thin film transistor (hereinafter referred to as TFT) is formed on the back glass substrate 41 using amorphous Si22. The TFT is formed by the gate electrode layer 20, the first insulating layer 21, the contact layer 23, and the source / drain electrode layer 24, and is connected to the pixel electrode 26 so that the pixel portion driving TFT 65 can drive the liquid crystal layer. . The light detection amount reading TFT 66 is a TFT for reading the light detection amount. Although the number of TFTs is one in the figure, a plurality of TFTs may be used. If the photodetecting element 67 is formed with the same structure as the TFT for driving the liquid crystal layer, it can be formed without increasing the number of steps compared to the case of manufacturing a normal TFT array substrate. The gate electrode layer 20 and the source / drain electrode 24 are usually made of a metal material such as Mo or Al having a high light shielding property.

  The region corresponding to the photodetection layer 44 in FIG. 4 is a portion of the amorphous Si 22 where the source / drain electrode 24 does not exist on the upper side. The size on the plane may be, for example, 10 × 5.0 μm. A black matrix 13 is first arranged on the front glass substrate 11. The black matrix 13 is made of a light shielding material. This is used not only to define the display opening but also to form the light detection opening 51. On this, a color material 14, a common electrode 15, and an alignment film 16 are formed. As a result, it is possible to form the light detection unit opening at a low cost without increasing the number of steps as compared with the case of producing a normal color filter substrate.

  Here, a specific numerical example of the range of the distance x in the horizontal direction between the photodetection layer 44 and the photodetection unit opening 51 that can take in the maximum amount of external light will be described. The second insulating layer is made of SiN and has a refractive index of 1.9 and a film thickness of 0.4 μm. The alignment film is made of polyimide and has a refractive index of 1.5 and a film thickness of 0.1 μm. 6. The film thickness is 5.0 μm, the alignment film has a refractive index of 1.5 and a film thickness of 0.1 μm, the common electrode is made of ITO and has a refractive index of 2.0 and a film thickness of 0.1 μm. Has a refractive index of 1.5, a film thickness of 1.0 μm, and an atmospheric refractive index of 1.0. Assuming that the alignment accuracy S is 4.0 μm, the appropriate range of x is 5.4 to 13.4 μm from the formula described in the first embodiment. When the size of the photodetection layer is 5.0 × 10 μm, the optimum size of the entire photodetection section opening is 15.4 to 31.4 μm on the short side when this value is applied to all four sides. The side is in the range of 20.4-36.4 μm.

  In the above example, amorphous Si is shown as the driving element, but poly-Si may be used.

Embodiment 3 FIG.
7 and 8 show examples of the reflective liquid crystal panel according to this embodiment. The cross section of the liquid crystal panel shown in FIG. 7 corresponds to FIG. Signal lines and the like are omitted. In the case of a reflective liquid crystal panel, compared to a transmissive liquid crystal panel, a liquid crystal driving element, a position detecting element, and the like can be disposed below the reflective electrode 28, so that it is easy to prevent a decrease in display aperture ratio. have. The major difference from the second embodiment is that the pixel electrode is changed to the reflective electrode 28, the second insulating layer 25 is thick, and the opening of the light detection portion is formed by the reflective electrode 28 on the TFT array substrate. It is a point.

  The gate electrode layer 20, the source / drain electrode 24, and the reflective electrode 28 are usually made of a metal material such as Mo or Al having high light shielding properties. Since the reflective electrode 28 and the amorphous Si layer 22 can be formed on the same TFT array substrate by using a photolithography technique, the alignment accuracy can be easily realized at plus or minus 1.0 μm or less.

  Here, a specific numerical example of the range of the distance x in the horizontal direction between the photodetection layer 44 and the photodetection unit opening 51 that can take in the maximum amount of external light will be described. When the second insulating layer is a transparent acrylic resin, the refractive index is 1.5, the film thickness is 2.0 μm, and the alignment accuracy S is 1.0 μm, the range of x is 1.8 to 3.8 μm. When the size of the photodetection layer is 5.0 × 10 μm, the optimum size of the entire photodetection section opening is applied to all four sides, and the short side is 8.6 to 12.6 μm and the long side The side is in the range of 13.6 to 17.6 μm, which can be significantly reduced as compared with the second embodiment. Thus, in the case of a reflective liquid crystal panel, it can be formed without increasing the number of processes by using a reflective electrode at the opening of the light detection section, and light detection is possible compared to the case of the black matrix used in the transmissive liquid crystal. Since the opening of the part can be reduced, the reduction of the display area can be greatly reduced.

  Similarly, in the case of the transflective liquid crystal, the same effect can be obtained by disposing a light detection portion in the reflective electrode portion. Further, both the reflective and transflective liquid crystals may use poly-Si instead of amorphous Si22.

  According to the present embodiment, the opening can be formed at low cost by forming the light detection portion opening with the material forming the reflective electrode. In addition, since the photodetection layer and the reflective electrode can be formed with high accuracy on the same substrate, the photodetection part opening can be formed as ideal compared to the case where it is formed on the black matrix, It is possible to greatly prevent the area of the display aperture ratio from decreasing.

Embodiment 4 FIG.
FIG. 9 shows a view in which the length y of the back-side light blocking body 43 is examined. First, the lower light-shielding body 43 needs to be larger than the light detection layer 44 so that light directly incident from the backlight 30 does not directly enter the light detection layer. Further, a condition is considered in which light emitted from the backlight 30 is reflected once by the front-side light blocking body 12 and is not incident on the light detection layer 44. Since the maximum incident angle of light entering from the backlight is 90 degrees, the incident angle into the liquid crystal panel is the same as θ considered in the first embodiment. Since the incident angle θ is equal to the reflection angle θ when light is reflected by the front-side light-shielding body 12, the value of the distance y between the end of the light detection layer 44 and the end of the front-side light-shielding body 12 is shown in the first embodiment. A value y = 2 × d × tan θ that is twice x. If y is larger than this value, the light from the backlight 30 does not enter the light detection element 44.

  In addition, if the size of the light detection portion opening 51 from the end of the light detection layer 44 is larger than d × tan θ, the value of d × tan θ is added to the actual value of the light detection portion opening 51. There is a need. Otherwise, the light from the backlight will come out to the front side, causing a reduction in display quality. Considering the range of x shown in the first embodiment in consideration of the alignment accuracy, the range of y is expressed as 2 × d × tan θ ≦ y ≦ 2 × d × tan θ + 2 × S. In general, the front light-shielding body is often formed of a multilayer film of CrO / Cr in order from the front side, and a lot of light from the backlight is reflected inward, so such a design is necessary. In order to prevent internal reflection at the front-side light shield, a black resin or the like may be used for the front-side light shield 12. Further, in order to absorb light, a color filter or the like may be disposed so as to overlap the inside of the panel of the front light-shielding body.

より大きく

より小さければよい。 Next, the case of FIG. 5 which is an example of a transmission type liquid crystal panel will be considered in a specific case. If the component directly entering the light detection layer of the light emitted from the backlight 30 is blocked by the gate electrode layer 20, the light from the backlight does not directly enter the light detection layer. Therefore, the gate electrode layer 20 may be larger than the light detection layer. In order to prevent the light emitted from the backlight 30 from being reflected by the black matrix 13 and entering the light detection layer, a method of increasing the size of the source / drain electrode layer 24 instead of the gate electrode layer 20 may be used. At this time, the distance required in the horizontal direction from the end of the photodetection layer to the source / drain electrode layer 24 is obtained from the above-described relational expression y and the expression shown in the first embodiment.

Bigger

It needs to be smaller.

  The role of the back-side light blocking body 43 shown in FIG. 8 is achieved by two of the gate electrode layer 20 and the source / drain electrode layer 24. Thereby, for example, the size of the gate electrode is reduced as compared with the case where the back-side light-shielding layer is formed only by the gate electrode layer 20, so that the parasitic capacitance due to the gate electrode can be reduced. When the parasitic capacitance is large, various adverse effects such as an increase in power consumption and an increase in signal delay occur. Therefore, the reduction in parasitic capacitance is very effective for improving the performance as a liquid crystal panel.

  According to the present embodiment, by defining the size of the electrode layer, it is possible to prevent light from the backlight from reaching the photodetection layer, and to form all the light shielding layers in the gate electrode layer Since the parasitic capacitance can be reduced as compared with the above, it is possible to reduce a phenomenon that leads to a reduction in display quality such as an increase in power consumption and an increase in signal delay.

より大きく

より小さくすれば同様の効果が得られる。構造が異なる場合でも実施の形態４と同じ効果が得られる。 Embodiment 5 FIG.
In the case of the reflective liquid crystal display device and the transflective liquid crystal display device, the same effect can be obtained if the light detection portion opening is replaced with the reflective electrode from the black matrix as in the fourth embodiment. From the arrangement shown in FIGS. 7 and 8, the gate electrode layer 20 is made larger than the photodetection layer and is required in the horizontal direction from the end of the photodetection layer to the source / drain electrode layer 24 as in the case of the fourth embodiment. The distance is

Bigger

If it is made smaller, the same effect can be obtained. Even when the structure is different, the same effect as in the fourth embodiment can be obtained.

  According to this embodiment, in the reflective liquid crystal display device and the transflective liquid crystal display device, it is possible to prevent the light from the backlight from reaching the light detection layer by defining the size of the electrode layer. In addition, the parasitic capacitance can be reduced compared to the case where all the light shielding layers are formed in the gate electrode layer, thereby reducing the phenomenon that leads to the deterioration of display quality such as an increase in power consumption and an increase in signal delay. Can do.

It is a figure when the common liquid crystal display panel by Embodiment 1 is seen from the surface. It is a figure when the optical sensor built-in type liquid crystal display panel by Embodiment 1 is seen from the surface. 1 is a cross-sectional view of a photosensor built-in liquid crystal display panel according to Embodiment 1. FIG. FIG. 3 is an enlarged cross-sectional view of the light detection element according to the first embodiment. It is a figure when the transmissive liquid crystal display panel by Embodiment 2 is seen from the surface. 6 is a cross-sectional view of a transmissive liquid crystal display panel according to Embodiments 2 and 4. FIG. It is a figure when the reflective liquid crystal display panel by Embodiment 3 is seen from the surface. 6 is a cross-sectional view of a reflective liquid crystal display panel according to Embodiments 3 and 5. FIG. FIG. 6 is an enlarged cross-sectional view of a photodetecting element according to Embodiments 4 and 5.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Polarizing plate, 11 Front side glass substrate, 12 Front side light-shielding body, 13 Black matrix, 14 Color material, 15 Common electrode, 16 Orientation film, 20 Gate electrode layer, 21 1st insulating layer, 22 Amorphous Si layer, 23 Contact layer, 24 source / drain electrode layer, 25 second insulating layer, 26 pixel electrode, 27 alignment film, 28 reflective electrode, 30 backlight, 40 polarizing plate, 41 back side glass substrate, 42 liquid crystal layer, 43 back side light shielding body, 44 light detection layer , 101 red pixel, 102 green pixel, 103 blue pixel, 104 non-display part (black matrix), 105 light detection part (whole), 106 light detection part opening part, 401 liquid crystal drive element.

Claims (5)

In a liquid crystal display device comprising a color filter substrate, a TFT array substrate, and a liquid crystal layer sandwiched between the substrates, and a photodetecting element disposed on the TFT array substrate,
D ₁ of each of the thickness of each layer between the light detecting portion opening provided with the light detection layer on the color filter substrate of the light detection _{element, d 2, d 3, ···} d N, the effective refractive index N ₁ , n ₂ , n ₃ ,... _{N N} , and the refractive index between the observer and the liquid crystal display device is n _A ,
When the alignment accuracy of the light detection layer and the light detection unit opening is ± S,
One of the light detection unit openings is horizontally outward from the light detection layer from an end of the light detection layer.

Bigger

A sensor-integrated liquid crystal display device characterized by being smaller. 2. The sensor-integrated liquid crystal display device according to claim 1, wherein the light detection unit opening is disposed in a black matrix formed on the color filter substrate. 2. The sensor-integrated liquid crystal according to claim 1, wherein the liquid crystal display device is of a reflective type or a transflective type, and the opening of the light detection portion is formed in a reflective electrode formed on the TFT array substrate. Display device. A light detection unit opening is formed in a black matrix on a color filter substrate, and a gate electrode layer as a first electrode, a first insulating film, a Si layer, and a source / drain electrode as a second electrode on the TFT array substrate In a photosensor-integrated liquid crystal display device in which a layer is formed and a photodetection layer is formed of the Si layer in the gap portion of the source / drain electrode layer,
The gate electrode layer is formed larger than the photodetection layer, and the size of the source / drain electrode layer is outside the photodetection layer in the horizontal direction from the end of the photodetection layer,

Bigger

The sensor-integrated liquid crystal display device according to claim 2, wherein the sensor-integrated liquid crystal display device is smaller. A light detection unit opening is formed in the reflective electrode on the TFT array substrate, and the gate electrode layer as the first electrode, the first insulating film, the Si layer, and the source / drain as the second electrode on the TFT array substrate. In the photosensor-integrated liquid crystal display device in which the electrode layer is formed and the photodetection layer is formed of the Si layer in the gap portion of the source / drain electrode layer,
The gate electrode layer is formed larger than the photodetection layer, and the size of the source / drain electrode layer is horizontally outside the photodetection layer from the photodetection layer end,

Bigger

4. The sensor-integrated liquid crystal display device according to claim 3, wherein the sensor-integrated liquid crystal display device is smaller.

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