JP5712517B2 - Color filter substrate and display device - Google Patents

Description

  The present invention relates to a display device capable of reading information from the outside, and more particularly to a display device capable of reading information with high accuracy. The present invention also relates to a color filter substrate capable of improving information reading accuracy in a display device capable of reading information from the outside.

  Currently, display devices that can read external information via a display surface, such as ticket machines and ATM devices, are widely used. According to such a display device, information related to display contents on the display device can be input very directly.

  As a display device capable of reading external information, for example, a device using an optical sensor is known as disclosed in Patent Document 1. In this apparatus, a selective transmission layer that selectively transmits light in a specific wavelength range is provided at a position facing the optical sensor from the observer side, and the optical sensor mainly transmits light in a specific wavelength range that has been transmitted through the selective transmission layer. To receive light. The external information is read by monitoring the output current from the optical sensor that increases or decreases depending on the amount of received light.

  The display device disclosed in Patent Document 1 is configured as an optical sensor type touch panel, and the optical sensor receives reflected light from the detection object such as a finger, so that the detection object is brought into contact with the display surface. Is supposed to be detected. The display device disclosed in Patent Document 1 includes a liquid crystal display panel having an optical sensor and a selective transmission layer, and a backlight that illuminates the liquid crystal display panel from the back. Infrared light is emitted from the backlight, and the selective transmission layer selectively transmits infrared light.

JP2009-151039A

  However, when an information reading function using an optical sensor method is provided to the display device, the optical sensor in the display panel may sense a change in the amount of received light caused by the image light or the environmental light, and may cause a malfunction. In order to prevent this malfunction, the evaluation threshold for the output current from the optical sensor is also raised, but this measure detects only when a large amount of light is received, and information reading The sensitivity of the function is reduced.

  For this reason, in order to improve the accuracy of the information reading function, it is necessary to enhance the light emission output of light (signal) used for detection of the detection target. However, measures such as enhancing the light emission output of light as a signal lead to deterioration of energy efficiency. That is, it can be said that it is an unfavorable measure in the present day when attention is paid to the problem of improving the energy efficiency of the display device by improving the light utilization efficiency in consideration of environmental problems.

  The present invention has been made in consideration of the above points, and is a display device capable of reading information, and reads information with high accuracy without increasing the light emission output of signal light. It is an object to provide a display device that can be used. It is another object of the present invention to provide a color filter substrate for a display device that can contribute to reading information with high accuracy without increasing the light emission output of signal light.

  In addition, in a display device having an optical sensor type information reading function, not only when it functions as a touch panel, but also detects that light of a specific wavelength range is irradiated from an external light emitting device such as a pointer. Therefore, it is also being considered to read information by specifying a position on a display surface irradiated with light in a specific wavelength range. In such a display device, no matter how the reading accuracy of the display device is improved, if there is a problem with the light emitting device itself, for example, if the light emitting device is not emitting light with an appropriate light emission amount, Reading cannot be performed with high accuracy. It would be very convenient if the present invention could handle such problems.

The first color filter substrate according to the present invention comprises:
A color filter substrate that is disposed to face a back side substrate having a photosensor and that can form a display device that can read information from the outside based on an output from the photosensor, with the back side substrate. And
A substrate;
A colored portion formed on the substrate, the colored portion defining a pixel region through which video light is transmitted; and
An optical filter unit formed on the base material, the optical filter unit that comes to face the optical sensor when a color filter substrate is disposed facing the back side substrate, and
The optical filter part selectively transmits visible light in a specific wavelength range.

  In the first color filter substrate according to the present invention, the specific wavelength range may be a wavelength range in a range of 500 nm to 550 nm.

  In the first color filter substrate according to the present invention, the maximum transmittance of the optical filter part for light having a wavelength of 380 nm to 500 nm is 1% or less, and the light having a wavelength of 550 nm to 630 nm is used. The maximum transmittance of the optical filter unit may be 1% or less, and the maximum transmittance of the optical filter unit for light having a wavelength of 630 nm or more and 750 nm or less may be 2% or less.

The second color filter substrate according to the present invention comprises:
A color filter substrate that is disposed to face a back side substrate having a photosensor and that can form a display device that can read information from the outside based on an output from the photosensor, with the back side substrate. And
A substrate;
A colored portion formed on the substrate, the colored portion defining a pixel region through which video light is transmitted; and
An optical filter unit formed on the base material, the optical filter unit that comes to face the optical sensor when a color filter substrate is disposed facing the back side substrate, and
The maximum transmittance of the optical filter unit for light having a wavelength of 380 nm to 500 nm is 1% or less,
The maximum transmittance of the optical filter part for light having a wavelength of 550 nm or more and 630 nm or less is 1% or less;
The maximum transmittance of the optical filter unit for light having a wavelength of 630 nm or more and 750 nm or less is 2% or less.

  In the first or second color filter substrate according to the present invention, the transmittance of the optical filter unit for light having a wavelength of 830 nm may be 70% or more.

  In the first or second color filter substrate according to the present invention, the maximum transmittance of the optical filter unit for light having a wavelength of 380 nm to 500 nm may be 0.5% or less.

  Furthermore, in the first or second color filter substrate according to the present invention, the maximum transmittance of the optical filter portion for light having a wavelength of 550 nm or more and 630 nm or less may be 0.5% or less.

  Furthermore, in the first or second color filter substrate according to the present invention, the maximum transmittance of the optical filter unit for light having a wavelength of 630 nm or more and 750 nm or less may be 1% or less.

  Furthermore, in the first or second color filter substrate according to the present invention, the transmittance of the optical filter unit for light having a wavelength of 830 nm may be 75% or more.

  Furthermore, in the first or second color filter substrate according to the present invention, the maximum transmittance of the optical filter unit for light having a wavelength of 830 nm or more and 880 nm or less may be 85% or more.

  Furthermore, in the first or second color filter substrate according to the present invention, the optical filter portion may include an isoindoline-based yellow pigment and a metal phthalocyanine-based blue pigment. In the first or second color filter substrate according to the present invention, the isoindoline yellow pigment is PY139, and the metal phthalocyanine blue pigment is PB1, PB15: 1, PB15: 3 and PB15: 6. You may make it be at least 1 type selected from the group which consists of. In the first or second color filter substrate according to the present invention, the isoindoline-based yellow pigment is added in an amount of 30% by mass to 60% by mass with respect to the total mass of the pigment contained in the optical filter unit. The metal phthalocyanine-based blue pigment may be contained in an amount of 25% by mass to 50% by mass.

  Further, in the first or second color filter substrate according to the present invention, the optical filter portion contains an isoindoline-based yellow pigment, a metal phthalocyanine-based blue pigment, and a diketopyrrolopyrrole-based red pigment. You may make it. In the first or second color filter substrate according to the present invention, the isoindoline yellow pigment is PY139, and the metal phthalocyanine blue pigment is PB1, PB15: 1, PB15: 3 and PB15: 6. The diketopyrrolopyrrole red pigment may be PR254, which is at least one selected from the group consisting of: In such a first or second color filter substrate according to the present invention, the isoindoline-based yellow pigment is contained in an amount of 30% by mass to 60% by mass with respect to the total mass of the pigment contained in the optical filter unit. In addition, the metal phthalocyanine blue pigment may be contained in an amount of 25% by mass to 50% by mass, and the diketopyrrolopyrrole red pigment may be contained in an amount of more than 0% by mass and 15% by mass or less.

  Furthermore, in the first or second color filter substrate according to the present invention, the optical filter portion may further include a black pigment. In the first or second color filter substrate according to the present invention, the black pigment may be included in an amount exceeding 0% by mass and not more than 20% by mass with respect to the total mass of the pigments included in the optical filter unit. Good.

Furthermore, the first or second color filter substrate according to the present invention further comprises a black matrix formed on the substrate,
The optical filter portion is formed in a through hole that penetrates the black matrix,
The black matrix faces a second photosensor separate from the photosensor provided on the backside substrate when the color filter substrate is disposed to face the backside substrate. Also good. In the first or second color filter substrate according to the present invention as described above, the optical filter portion is surrounded by the black matrix from the entire periphery on the substrate, and has a wavelength of 380 nm to 1000 nm. The black matrix may have a maximum transmittance of 0.05% or less. In the first or second color filter substrate according to the present invention, the optical filter portion is surrounded by the black matrix from the entire periphery on the base material, and the black matrix is a carbon-based material. One or more selected from the group consisting of a pigment, a red pigment, a yellow pigment and a violet pigment, and a titanium-based pigment may be included. Further, the first or second color filter substrate according to the present invention further includes a light transmission part including a through hole penetrating the black matrix, and the light transmission part includes a color filter substrate on the back side. The optical sensor and the second optical sensor provided on the back-side substrate may face a separate third optical sensor when disposed facing the substrate.

A display device according to the present invention comprises:
A display panel having a back side substrate having an optical sensor and a color filter substrate disposed to face the back side substrate;
A control device connected to the optical sensor,
The control device is configured to read information from the outside based on an output from the optical sensor,
The color filter substrate is one of the first and second color filter substrates according to the present invention described above.

  In the display device according to the present invention, the optical sensor may be an optical sensor made of amorphous silicon.

  In the display device according to the present invention, the control device detects a position on the display surface irradiated with light emitted from a light emitting diode that emits light in a wavelength range of 500 nm to 550 nm. It may be configured to.

  Furthermore, in the display device according to the present invention, the control device is configured to detect a position on the display surface irradiated with light emitted from a light emitting diode emitting light having a wavelength of 830 nm or more. May be.

  Furthermore, the display device according to the present invention further includes a surface light source device that is disposed facing the display panel and illuminates the display panel from the back side substrate side, and the surface light source device is 500 nm or more and 550 nm or less. The light emitting diode which light-emits the light of the wavelength range in the range of this may be included.

  Furthermore, the display device according to the present invention further includes a surface light source device that is disposed facing the display panel and illuminates the display panel from the back substrate side, and the surface light source device has a wavelength of 830 nm or more. A light-emitting diode that emits the light may be included.

  According to the present invention, information can be read with high accuracy without increasing the light emission output of signal light.

FIG. 1 is a diagram for explaining an embodiment according to the present invention, and is a diagram schematically showing a configuration of a display device capable of reading information. FIG. 2 is a partial top view showing a liquid crystal display panel incorporated in the display device of FIG. 1, in which a color filter substrate is partially omitted. FIG. 3 is a diagram illustrating a cross section taken along line III-III in FIG. 2, and is a diagram for describing an example of a function of detecting light emitted from the light emitting device. FIG. 4 is a graph showing an example of the wavelength sensitivity distribution of the optical sensor. FIG. 5 is a graph showing the spectral transmittance of each pigment that can be used in the optical filter section. FIG. 6 is a graph showing the spectral transmittance of PY150 and PY139. FIG. 7 is a graph showing the spectral intensity distribution of sunlight. FIG. 8 is a graph showing an example of the spectral transmittance of the light shielding portion (black matrix). FIG. 9 is a cross-sectional view corresponding to FIG. 3, and is a diagram for explaining an example of a function for detecting contact or approach of the detection target to the display surface. FIG. 10 is a graph illustrating an example of the spectral transmittance of the optical filter unit. FIG. 11 shows the graph of FIG. 10 with the vertical axis magnification changed.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawings attached to the present specification, for the sake of illustration and ease of understanding, the scale, the vertical / horizontal dimension ratio, and the like are appropriately changed and exaggerated from those of the actual product.

  In the following embodiments, examples in which the present invention is applied to a liquid crystal display device (liquid crystal display) will be described. That is, in the following embodiments, the display device 10 is configured to include a display panel 40 including a liquid crystal display panel (LCD panel, liquid crystal display panel).

  As shown in FIG. 1, the display device 10 includes a display panel 40, a control device 20 that is connected to the display panel 40 and controls driving of the display panel 40, and a display panel 40 as a liquid crystal display panel. A surface light source device (backlight) 30 that illuminates from the person side. The display panel 40 formed as a liquid crystal display panel selectively transmits the planar light from the surface light source device 30, so that an image can be displayed on the display surface 12.

  As the surface light source device 30, for example, an edge light type or a direct type surface light source device may be used as appropriate.

  1 to 3 is irradiated not only with a display function for displaying an image on the display surface 12, but also with light in a specific wavelength range from a light emitting device 90 such as a pointer or an input pen. And a function capable of detecting which position on the display surface 12 is irradiated with light of a specific wavelength region from the light emitting device. That is, the display device 10 functions not only as an output device that outputs information such as characters and drawings as a video (display function), but also inputs information corresponding to the content displayed on the display surface 12. Also function (specific wavelength band light detection function). At this time, the display surface 12 of the display device 10 functions as an input surface of the input means.

  The control device 20 includes a video information processing unit 22 that processes information related to a video to be displayed, and a calculation unit 24 that reads information from the outside. The video information processing unit 22 is connected to the display panel 40 and drives the display panel 40 based on the video information. In other words, the video information processing unit 22 includes a circuit (drive circuit) configured to control the display state of each pixel based on the video information. On the other hand, the calculation unit 24 is connected to the video information processing unit 22 and can transmit the read information to the video information processing unit 22 as input information from the outside. At this time, the video information processing unit 22 can create video information based on the input information and display a video corresponding to the input information on the display surface 12. As for the video information processing unit 22 and the calculation unit 24 of the control device 20, including the circuit configuration, the video information processing unit 22 used in the conventional video display device and the calculation unit 24 used in the conventional touch panel device. It can be configured in the same manner.

  In the present embodiment, the calculation unit 24 detects the irradiation of the light of the specific wavelength range from the light emitting device 90 such as a pointer to the display surface 12, and the light of the specific wavelength range is irradiated from the light emitting device 90. An example in which an input of information from the outside via the display surface 12 is read by detecting a position on the display surface 12 being described will be described. However, as will be described later, such an aspect is merely an example. For example, the calculation unit 24 detects the contact or approach of the detected object 91 to the display surface 12 of the display device 10 and detects the detected object 91. By detecting the position on the display surface 12 that is in contact with or approaching, information input from the outside via the display surface 12 may be read.

  Next, the display panel 40 will be described in detail. The display panel 40 includes a display area DA (see FIG. 1) that can display an image. The display area DA is composed of a pixel area A1 and a non-pixel area A2 that is an area outside the pixel area A1. Here, the pixel area A1 is an area through which image light that forms an image can be transmitted and a pixel that is a minimum element constituting the image is located (occupied).

  In the present embodiment, the pixel area A1 has a plurality of unit pixel portions UP that constitute one pixel, and each unit pixel portion UP is composed of three sub-pixel portions SP. The three sub-pixel portions SP selectively transmit different colors. That is, light in different wavelength bands is transmitted from the three sub-pixel portions SP. Specifically, the three sub-pixel portions SP are configured to selectively transmit red light, green light, and blue light, respectively, thereby displaying a color image on the display surface 12. .

  As well shown in FIG. 3, a display panel 40 as a liquid crystal display panel includes a back side substrate (also called an element substrate or an array substrate) 70 disposed on the back side (surface light source device side), and a back side. A color filter substrate (also referred to as a counter substrate) 50 disposed facing the substrate 70 and a liquid crystal layer 45 sealed between the back substrate 70 and the color filter substrate 50 are included. As described above, the display device 10 has both a display function and a specific wavelength band light detection function (information reading function). Correspondingly, the display panel 40 realizes a display function for displaying an image. And a function for realizing a specific wavelength band light detection function (information reading function). Of the display panel 40 having such an outline, first, a configuration for realizing the display function will be described first, and then a configuration for realizing the specific wavelength band light detection function (information reading function) will be described.

  First, the color filter substrate 50 includes a first base material 51 having translucency and a black matrix (BM) 58 formed on the base material 51 in a predetermined matrix pattern. The black matrix 58 is formed with through holes that each constitute the sub-pixel portion SP. In the present embodiment, colored portions 52 (52R, 52G, 52B) colored in the display color of the sub-pixel portion SP are formed in the through-holes constituting each sub-pixel portion SP. The light transmitted through the colored portion (colored layer) 52 forms an image. That is, the pixel area A1 is formed by the coloring portion 52, and the area other than the pixel area (for example, the area where the black matrix 58 is formed) in the display area DA forms the non-pixel area A2.

  Furthermore, the color filter substrate 50 is appropriately provided with other components in order to effectively function as a viewer side substrate (counter substrate) of the liquid crystal display panel. For example, as shown in FIG. 3, a protective film 53, a transparent electrode layer 54, and an alignment film 55 are formed in this order on the colored portion 52 toward the liquid crystal layer 45 side. A polarizing plate 56 is laminated on the side of the base 51 of the color filter substrate 50 opposite to the liquid crystal layer 45, that is, on the viewer side of the base 51 of the color filter substrate 50.

  On the other hand, as shown in FIGS. 2 and 3, the back substrate 70 includes a second base 71 having translucency, a pixel electrode 72 disposed in each pixel region A1 on the base 71, and have. In addition, a switching element 78 (see FIG. 2) that controls application to the pixel electrode 72 is provided separately for each pixel electrode 72 (sub-pixel unit SP). The switching element 78 can be formed as a thin film transistor (TFT). The switching element 78 operates based on the control from the video information processing unit 22 of the control device 20 described above. Various circuit wirings (not shown) such as scanning lines and signal lines (data lines) necessary for driving the switching element 78 are formed on the second base material 71.

  Further, the back side substrate 70 is appropriately provided with other components in order to effectively function as a substrate (element substrate, array substrate) on the surface light source device side of the liquid crystal display panel. For example, as shown in FIG. 3, a protective film 73 and an alignment film 75 are formed on the pixel electrode 72 in this order toward the liquid crystal layer 45 side. In addition, a polarizing plate 76 is laminated on the side opposite to the liquid crystal layer 45 of the base material 71 of the back side substrate 70, that is, on the surface light source device side of the base material 71 of the back side substrate 70.

  The configuration of the display panel 40 described above is mainly a configuration for fulfilling a function (display function) as a liquid crystal display panel. Next, the configuration of the display panel 40 for realizing the specific wavelength band light detection function (information reading function) will be described. In order for the display device 10 to realize a specific wavelength band light detection function, the back side substrate 70 of the display panel 40 includes a large number of photosensors 81, 82, 83, and the color filter substrate 50 includes the photosensors 81, 82. , 83 is formed with any one of the optical filter portion 61, the light shielding portion 62, and the light transmitting portion 63.

  The optical sensors 81, 82, and 83 are capable of sensing light, and may be composed of, for example, a photodiode. The optical sensors 81, 82, and 83 as photodiodes output a large current as the amount of detected light increases. The outputs of the optical sensors 81, 82, 83 are sent to the arithmetic unit 24 of the control device 20 described above. The calculation unit 24 monitors changes in the output current of the optical sensors 81, 82, 83. On the second base material 71 of the back substrate 70, in order to enable detection of outputs from the optical sensors 81, 82, 83 and specification of the positions of the optical sensors 81, 82, 83 in the display area DA, Various circuit wirings (not shown) such as sensing wires are formed.

  FIG. 4 shows sensitivity characteristics of an amorphous silicon photosensor and a single crystal silicon photosensor as an example. The single crystal silicon photosensor has sufficient sensitivity to visible light and infrared light having a wavelength of 380 nm to 1000 nm. On the other hand, the amorphous silicon photosensor has sufficient sensitivity to light (visible light) in a narrower wavelength range from 380 nm to 700 nm. The detailed configuration and manufacturing method of circuit wiring and the like associated with the optical sensors 81, 82, and 83 are disclosed in various known documents (for example, Japanese Unexamined Patent Application Publication No. 2009-151039), and detailed description thereof is omitted here. To do.

  As can be understood from FIG. 2, the photosensors 81, 82, 83 are all provided in the non-pixel region A <b> 2 on the second base material 71 of the back substrate 70. As described above, each of the optical sensors 81, 82, 83 faces one of the optical filter unit 61, the light shielding unit 62, and the light transmission unit 63 of the color filter substrate 50 described in detail later. . The photosensors are classified into a first photosensor 81, a second photosensor 82, and a third photosensor 83 according to the configuration of the color filter substrate 50 facing each other. As well shown in FIG. 2, the same number of photosensors 81, 82, and 83 as the number of sub-pixel portions SP are provided, and the first to first photosensors are provided so as to correspond to one sub-pixel portion SP. Any one of the three light sensors 81, 82, and 83 is provided.

  In the present embodiment, the first optical sensor 81, the second optical sensor 82, and the third optical sensor 83 are made of an amorphous silicon optical sensor. Accordingly, the first optical sensor 81, the second optical sensor 82, and the third optical sensor 83 have the same configuration and the same spectral sensitivity characteristics. As shown in FIG. 4, the first photosensor 81, the second photosensor 82, and the third photosensor 83 made of an amorphous silicon photosensor have sufficient sensitivity to light having a wavelength of 380 nm to 700 nm, In particular, it has extremely high sensitivity to light in the wavelength range from 500 nm to 550 nm.

  On the other hand, the optical filter portion (specific wavelength transmission layer) 61 disposed to face the first optical sensor 81 selectively transmits light in a specific wavelength region. The optical filter unit 61 is formed in a region on the first base member 51 including a position where the color filter substrate 50 faces the first optical sensor 81 in a state where the color filter substrate 50 is disposed to face the back side substrate 70. Yes.

  The “selective transmission of light in a specific wavelength range” here means so-called “wavelength selective transmission”, and of course, only light in a specific wavelength range is transmitted with a transmittance of 100%. This does not mean that only light having a wavelength outside the specific wavelength range may be transmitted, and the light transmittance of the specific wavelength range may not be 100%. That is, in “selectively transmit light in a specific wavelength range”, the transmittance for light in a specific wavelength range that passes through the optical filter unit 61 is set to light with a wavelength outside the specific wavelength range that passes through the optical filter unit 61. The case where the transmittance is higher than the above is also included.

  In the present embodiment, the optical filter unit 61 mainly transmits visible light in a specific wavelength range, more specifically, green light having a wavelength range in a range of 500 nm to 550 nm and absorbs other light. It is supposed to be. Such an optical filter unit 61 is a method similar to the above-described coloring unit 52 called a so-called color filter (color filter layer), that is, a pigment-dispersed resist coating film in which a pigment capable of absorbing light of a predetermined wavelength is dispersed. Then, it can be formed on the first substrate 51 of the color filter substrate 50 by patterning using a photolithography technique. That is, the optical filter unit 61 includes a pigment, mainly transmits visible light in a specific wavelength range, and mainly absorbs light in other wavelength ranges. As shown in FIG. 2, the optical filter unit 61 is formed in a region within the non-pixel region A <b> 2 that is surrounded by the black matrix 58.

  As organic pigments for selectively transmitting green light in a wavelength range of 500 nm to 550 nm, isoindoline yellow pigments and metal phthalocyanine blue pigments are used in combination. In this combination, Pigment Yellow 139 (PY139) can be used as an isoindoline-based yellow pigment. Further, as the metal phthalocyanine-based blue pigment, copper phthalocyanine-based pigments can be used, among others, Pigment Blue 1 (PB1), Pigment Blue 15: 1 (PB15: 1), Pigment Blue 15: 3 (PB15: 3) and One or more selected from the group consisting of CI Pigment Blue 15: 6 (PB15: 6) can be used.

The graph of FIG. 5 shows the spectral transmittance of Pigment Yellow 139 (PY139) and the spectral transmittance of Pigment Blue 15: 6 (PB15: 6). As shown in FIG. 5, Pigment Yellow 139 exhibits excellent light blocking properties for light having a wavelength in the range of 380 nm to 500 nm. Furthermore, Pigment Blue 15: 6 exhibits excellent light blocking properties with respect to light having a wavelength in the range of 570 nm to 750 nm.
Please set to 750nm

  In the manufacture of a substrate for a display device such as a general color filter substrate, pigment yellow 150 (PY150), pigment yellow 139 (PY139), and the like have been used as yellow pigments. However, when the spectral transmittance characteristics are compared as shown in FIG. 6, when using Pigment Yellow 139 (PY139), the wavelength range of 470 nm to 500 nm cannot be effectively blocked by Pigment Yellow 150 (PY150). It can be seen that it is possible to sufficiently block light in the range of 380 nm to 400 nm. Therefore, in the combination of pigments included in the optical filter unit 61 described here, it is effective to use Pigment Yellow 139 (PY139) in that light having a wavelength that cannot be sufficiently blocked by other pigments can be sufficiently blocked. It is.

  In the present embodiment, a diketopyrrolopyrrole red pigment and a black pigment are further combined and used as an organic pigment for selectively transmitting green light within a wavelength range of 500 nm to 550 nm. Yes. Pigment Yellow 254 (PR254) can be used as a diketopyrrolopyrrole red pigment. Pigment Red 254 exhibits excellent light blocking properties with respect to light in the wavelength region of 450 nm or more and 570 nm or less excluding the vicinity of 530 nm. On the other hand, titanium black or carbon black can be used as the black pigment. When a black pigment is added, the pigment concentration in the resin composition forming the filter portion 61 can be reduced. Accordingly, it is possible to stably realize light shielding in a predetermined wavelength range with other pigments, that is, with a yellow pigment, a blue pigment, and a red pigment.

  The blending ratio of each pigment is 30% by mass to 60% by mass of an isoindoline-based yellow pigment with respect to the total mass of the pigment contained in the optical filter unit 61, and a metal phthalocyanine-based blue pigment. 25% by mass or more and 50% by mass or less, diketopyrrolopyrrole red pigment exceeding 0% by mass and 15% by mass or less, black pigment exceeding 0% by mass and 20% by mass or less Can do.

  As a result of repeated experiments by the present inventors, the optical filter unit 61 exhibits excellent wavelength selective transmission by adopting the combination of pigments described above. Specifically, the present inventors have confirmed that the maximum transmittance of the optical filter unit 61 for light having a wavelength of 380 nm to 500 nm is 1% or less, and further 0.5% or less. I was able to. Moreover, the maximum transmittance of the optical filter unit 61 for light having a wavelength of 550 nm or more and 630 nm or less could be 1% or less, and further 0.5% or less. Furthermore, the maximum transmittance of the optical filter unit 61 with respect to light having a wavelength of 630 nm or more and 750 nm or less could be 2% or less, and further 1% or less.

  That is, the optical filter unit 61 can sufficiently block light in the visible light region of 750 nm or less, except for light in the wavelength region of 500 nm or more and 550 nm or less. In particular, as an example, as shown in FIG. 7 showing the spectral intensity distribution of sunlight, the ambient light such as sunlight and illumination light contains the most light in the wavelength range of 380 nm to 750 nm. According to the optical filter unit 61 having the pigment structure described above, light in the wavelength range of 380 nm to 750 nm, which occupies most of the environmental light, is extremely effective, except for light in the wavelength range of 500 nm to 550 nm. Can be shielded from light.

  Next, the light shielding unit 62 located opposite to the second optical sensor 82 shields light having a wavelength of 380 nm to 1000 nm. The light shielding portion 62 is formed in a region on the first base material 51 including a position where the color filter substrate 50 faces the second photosensor 82 in a state where the color filter substrate 50 is disposed facing the back side substrate 70. Yes. As shown in FIG. 2, in the present embodiment, the light shielding unit 62 is configured by a part of the black matrix 58. The term “light shielding” used here does not mean that the transmittance is 0% but also means that the maximum transmittance of the light shielding portion 62 for light of 380 nm to 1000 nm is lowered.

  Similar to the optical filter unit 61, the light shielding unit 62 is formed on the first substrate 51 by patterning a pigment-dispersed resist coating film in which a pigment capable of absorbing light is dispersed using a photolithography technique. obtain. As a pigment for absorbing light having a wavelength of 380 nm or more and 1000 nm or less, at least one selected from the group consisting of carbon pigments (carbon compounds), red pigments, yellow pigments and purple pigments, and titanium pigments ( And a combination of pigments containing at least a titanium compound). In this combination, carbon black can be used as the carbon pigment. Further, as the red pigment, a diketopyrrolopyrrole pigment, in particular, pigment red 254 (PR254) can be used. As the yellow pigment, an isoindoline-based yellow pigment, in particular, pigment yellow 139 (PY139) can be used. As the purple pigment, a quinacridone-based purple pigment, in particular, pigment violet 23 (PV23) can be used. Titanium black can be used as the titanium-based pigment.

  As a result of repeated experiments by the present inventors, the light-shielding portion 61 includes at least one selected from the group consisting of carbon pigments (carbon compounds), red pigments, yellow pigments, and purple pigments, and titanium pigments ( In the case of including a titanium-based compound, the maximum transmittance of the light-shielding portion 61 for light having a wavelength of 380 nm or more and 1000 nm or less could be stably reduced to be significantly less than 0.05%.

FIG. 8 is a graph showing an example of the result of investigating the relationship between the pigment contained in the light shielding part 62 (black matrix 58) and the spectral transmittance of the light shielding part 62 (black matrix 58). Further, Table 1 shows the maximum transmittance of each sample with respect to the pigment contained in each sample whose spectral transmittance is shown in FIG. 8 and light having a wavelength of 380 nm to 1000 nm.

  For Samples 1 and 2 composed of the pigments described above, the transmittance of the light shielding part with respect to light having a wavelength of 380 nm or more and 1000 nm or less was much lower than 0.05%. On the other hand, for sample 3 containing only carbon black as a pigment, the transmittance of the light shielding part is 0.05% for light on the long wavelength side of the visible light (specifically, light having a wavelength of 620 nm or more). In addition, the transmittance of the light shielding part with respect to infrared rays was greatly increased. Moreover, about the sample 4 which contains only titanium black as a pigment, although the transmittance | permeability of the light-shielding part about infrared rays was able to be made low, the transmittance | permeability of the light-shielding part about visible light greatly exceeded 0.05% . As a result, the maximum transmittance in the wavelength region of 380 nm or more and 1000 nm or less is much lower in samples 1 and 2 than in samples 3 and 4.

  As described above, the optical filter unit 61 selectively transmits light in a specific wavelength range. The first optical sensor 81 disposed so as to face the optical filter unit 61 is intended to monitor the amount of light in a specific wavelength range that passes through the optical filter unit 61. In this embodiment, the black matrix 58 having the same excellent light shielding property as the light shielding unit 62 surrounds the entire periphery of the optical filter unit 61. Therefore, most of the light received by the first optical sensor 81 is light transmitted through the optical filter unit 61 as intended. That is, the black matrix 58 having excellent light shielding properties surrounds the entire periphery of the optical filter unit 61, so that the light selective transparency of the optical filter unit 61 functions more effectively.

  Finally, the light transmitting portion 63 positioned facing the third optical sensor 83 is formed of a through hole formed at a position facing the third optical sensor 83 of the black matrix 58. The light transmission portion 63 (through hole) is a region on the first base material 51 including a position where the color filter substrate 50 faces the third optical sensor 83 in a state where the color filter substrate 50 is disposed facing the back substrate 70. Is formed. As shown in FIG. 2, the light transmission part 63 is formed in a region in the non-pixel region A <b> 2 surrounded by the black matrix 58 around the entire periphery.

  By the way, each first photosensor 81 is associated with one or more second photosensors 82 arranged in proximity. Each first photosensor 81 is also associated with any one or more third photosensors 83. In particular, in the present embodiment, the associated first optical sensor 81 and the second optical sensor 82 have a one-to-one relationship, and similarly, the associated first optical sensor 81 and third optical sensor 83 are also a pair. 1 relationship. In addition, from the viewpoint of improving the detection accuracy of light in a specific wavelength range, it is preferable that the first to third optical sensors 81, 82, and 83 associated with each other are sensors that are arranged close to each other. As a specific example, in the present embodiment, the first to third optical sensors 81, 82, and 83 arranged in the small area LA indicated by the dotted line in FIG. 2 are associated with each other.

  The display device 10 having the above configuration has a specific wavelength band light detection function (information reading function) with high sensitivity and high accuracy, and can read information from the outside. Hereinafter, when the display device 10 detects that light of a specific wavelength region is irradiated on the display surface 12 from the light emitting device 90 such as a pointer, the light of the specific wavelength region is further displayed from the light emitting device 90. The operation of the display device 10 relating to the specific wavelength region light detection function when reading information from the outside by detecting which position on the surface 12 is irradiated will be described.

  As shown in FIG. 3, the light emitted from the surface light source device 30 travels into the display panel 40. Then, the switching element 78 is driven by a signal from the video information processing unit 22 of the control device 20, and the light emitted from the surface light source device 30 defines each sub-pixel unit SP while adjusting the transmittance. The colored portions 52R, 52G, and 52B are transmitted. The light that passes through the coloring portions 52R, 52G, and 52B and is emitted from the display panel 40 forms an image as image light.

  On the other hand, when visible light in a specific wavelength range is emitted from the light emitting device 90 such as a pointer, and the visible light in the specific wavelength range is irradiated on the display surface 12 of the display device 10, the visible light in the specific wavelength range is an optical filter. The light passes through the part 61 and is received by the first optical sensor 81 provided immediately below the optical filter part 61 (on the surface light source device side). That is, the amount of light received by the first optical sensor 81 is increased by irradiating the light on the display surface 12 facing the first optical sensor 81 with light in a specific wavelength range from the light emitting device 90. The calculation unit 24 of the control device 20 monitors the change in the output current amount of the first optical sensor 81 provided in large numbers in the display panel 40, so that light in a specific wavelength region is emitted from the light emitting device 90 onto the display surface 12. The irradiation is detected together with the position on the display surface 12 where the light in the specific wavelength region is irradiated.

  In FIG. 3 and FIG. 9 referred later, visible light is indicated by a thick arrow, and light in a specific wavelength range (green light in the present embodiment) is indicated by a thin arrow.

  By the way, when a layer having a light shielding property such as a black matrix is not formed on the back side substrate 70, the first light sensor 81 has visible light emitted from the surface light source device 30 as shown in FIG. 3. Is received from the back side. Further, stray light composed of infrared rays and visible rays is generated in the display panel 40. The first optical sensor 81 receives these lights regardless of the irradiation of the light of the specific wavelength range from the light emitting device 90 to the display surface 12, and generates an output current corresponding to these lights. Furthermore, due to the nature of the optical sensor itself, the first optical sensor 81 may always output a weak current regardless of light reception. As a result, the output current from the first light sensor 81 is not caused only by the light emitted from the light emitting device 90, and therefore, the specific current from the light emitting device 90 is based on only the output current of the first light sensor 81. If it is attempted to detect the irradiation of light in the wavelength band, the reliability of detection accuracy is reduced.

  On the other hand, the first photosensor 81 is associated with at least one second photosensor 82 arranged in proximity. Since the second optical sensor 82 is disposed directly below the light shielding unit 62 (on the surface light source device side), the visible light in a specific wavelength region emitted from the light emitting device 90 and irradiated onto the display surface 12 is basically Does not receive light. On the other hand, since the second optical sensor 82 is disposed in the vicinity of the first optical sensor 81, the second optical sensor 82 receives the light source light from the back side and receives the stray light as much as the first optical sensor 81. . Furthermore, since the second optical sensor 82 is configured in the same manner as the first optical sensor 81, the second optical sensor 82 also tends to output a weak current to the same extent as the first optical sensor 81. Therefore, when the calculation unit 24 of the control device 20 determines the irradiation of the specific wavelength band light from the light emitting device 90, not only the output current from the first photosensor 81 but also the first photosensor associated with the first photosensor. By taking into account the output current from the two-light sensor 82, it is possible to determine the irradiation of light in a specific wavelength region from the light emitting device 90 to the display surface 12 with higher accuracy. As an example, the calculation unit 24 of the control device 20 calculates the difference between the output current from the first optical sensor 81 and the output current from the second optical sensor 82, and when the obtained difference exceeds a threshold value, It may be configured to determine that light in a specific wavelength region is irradiated from the light emitting device 90 to a position on the display surface 12 facing the target first optical sensor 81. Alternatively, as another example, the calculation unit 24 of the control device 20 sets a threshold value each time based on the output current from the second photosensor 82, and the output current from the first photosensor 81 exceeds the set threshold value. In this case, the light emitting device 90 may be configured to determine that the light on the display surface 12 facing the target first optical sensor 81 is irradiated with light in a specific wavelength range.

  Furthermore, when the brightness of the environment in which the display device 10 is arranged changes, the amount of light received by the first optical sensor 81 also changes. As an example, as shown in FIG. 7 showing the spectral intensity distribution of sunlight, visible light, particularly green light in a specific wavelength range that is selectively transmitted by the filter unit 61 in the present embodiment, in sunlight or illumination light. Many are included. Therefore, in a bright environment, a larger amount of green light enters the display panel 40 via the optical filter unit 61 and is received by the first optical sensor 81. In a bright environment, visible light easily enters the display panel 40 through the colored portion 52, and a large amount of visible light is received by the first optical sensor 81 as stray light. That is, the output current from the first optical sensor 81 increases regardless of the irradiation of light in the specific wavelength range from the light emitting device 90.

  On the other hand, the first optical sensor 81 is associated with at least one third optical sensor 83. The third light sensor 83 is disposed directly below the light transmission part 63 (through the surface light source device side) formed of a through hole formed in the black matrix 58. Therefore, the amount of light received by the third optical sensor 83 varies greatly according to changes in the brightness of the environment. For this reason, when the calculation unit 24 of the control device 20 determines the irradiation of the specific wavelength band light from the light emitting device 90, not only the output current from the first photosensor 81 but also the first photosensor is associated. By considering the output current from the third optical sensor 83, it is possible to determine the irradiation of light in a specific wavelength region from the light emitting device 90 to the display surface 12 with higher accuracy. As an example, the calculation unit 24 of the control device 20 sets a threshold each time based on the output current from the third photosensor 83, and when the output current from the first photosensor 81 exceeds the set threshold, It may be configured to determine that light in a specific wavelength region is irradiated from the light emitting device 90 to a position on the display surface 12 facing the target first optical sensor 81. Alternatively, as another example, the calculation unit 24 of the control device 20 calculates the difference between the output current from the first optical sensor 81 and the output current from the third optical sensor 83, and the obtained difference exceeds the threshold value. In this case, the light emitting device 90 may be configured to determine that light in a specific wavelength region is irradiated to a position on the display surface 12 that faces the target first optical sensor 81.

  In addition, in this embodiment, the maximum transmittance of the optical filter unit 61 for light having a wavelength of 380 nm to 750 nm is sufficiently low, 2% or less, except for light in the wavelength region of 500 nm to 550 nm. ing. In particular, when light in a wavelength range of 500 nm to 550 nm is excluded, the optical filter unit 61 for light having a wavelength of 380 nm to 630 nm that occupies most of the environmental light such as sunlight and forms most of the image light. The maximum transmittance is 1% or less. As a result, a large amount of ambient light is shielded by the optical filter unit 61 and is separated with high accuracy from the light emitted from the light emitting device 90 and applied to the display surface 12. Further, as a result of confirmation by the present inventors, the maximum transmittance of the optical filter unit 61 for light having a wavelength of 380 nm to 500 nm and light having a wavelength of 550 nm to 630 nm is 0.5% or less. In such a case, in an environment where the display device 10 is generally expected to be arranged, the wavelength included in the ambient light passing through the optical filter unit 61 is 380 nm to 500 nm, and the wavelength is 550 nm to 630 nm. The light received by the first optical sensor 81 is negligible.

  As described above, according to the present embodiment, even if the light amount of the specific wavelength light (green light) that is emitted from the light emitting device 90 such as a pointer and goes to the first optical sensor 81 is small, The filter unit 61 allows the specific wavelength light to be separated from other light with high efficiency. Thereby, it is prevented that a malfunction occurs with respect to the detection of the specific wavelength band light irradiated from the light emitting device 90 to the display surface 12, and the specific wavelength band light is irradiated from the light emitting device 90 to the display surface 12. It can detect with high accuracy and read information from outside with high accuracy.

  In particular, as a result of extensive research conducted by the present inventors, the maximum transmittance of the optical filter unit 61 for light having a wavelength of 380 nm to 500 nm is 1% or less, and the wavelength is 550 nm to 630 nm. The maximum transmittance of the optical filter unit 61 for light is 1% or less, the maximum transmittance of the optical filter unit 61 for light having a wavelength of 630 nm or more and 750 nm or less is 2% or less, and When the wavelength range of light emitted from the light emitting device 90 is in the wavelength range of 500 nm or more and 550 nm or less, the light of the specific wavelength range emitted by the light emitting device 90 is separated from the ambient light by the optical filter unit 61 with extremely high accuracy. It is confirmed that the first optical sensor 81 facing the optical filter unit 61 can sense with high sensitivity. . That is, according to the optical filter unit 61 having such a spectral transmittance, it is caused by visible light in the ambient light that is included in the output current from the first optical sensor 81 that is a popular optical sensor (photosensor). In a combination with the light emitting device 90 that emits light in the wavelength range of 500 nm to 550 nm, the component having a specific wavelength range irradiated from the light emitting device 90 can be weakened to a negligible level. Light could be sensed with sufficient sensitivity by the first light sensor 81. Thus, in the embodiment described above, the display surface 12 irradiated with light in the specific wavelength region from the light emitting device 90 without increasing the light emission amount of the light in the specific wavelength region from the surface light source device 30. It is possible to specify the position on the top with extremely high accuracy.

  Moreover, the light of the specific wavelength range emitted from the light emitting device 90 and applied to the display surface 12 is visible light. Therefore, an operator who operates the light emitting device 90 from a position away from the display surface 12 always knows accurately on which position on the display surface 12 the light in the specific wavelength range from the light emitting device 90 is irradiated. Can do. Thereby, the operator can operate the light-emitting device 90 exactly as intended. Furthermore, the operator can instantly recognize that a defect such as a battery exhaustion occurs in the light emitting device 90 and that no visible light having a specific wavelength is emitted from the light emitting device 90. That is, unlike the case where the light emitting device 90 emits invisible light such as infrared rays or ultraviolet rays, it is possible to effectively prevent the failure of the light emitting device 90 from being overlooked. For this reason, according to the present embodiment, information from the outside can be input to the display device 10 through the display surface 12 under appropriate conditions. Information can be read with high accuracy.

  Note that various modifications can be made to the above-described embodiment. Hereinafter, an example of modification will be described with reference to the drawings. In the drawings used in the following description, the same reference numerals as those used in the above-described embodiment are used for portions that can be configured in the same manner as in the above-described embodiment, and redundant description is omitted.

  In the above-described embodiment, by detecting that light in a specific wavelength region emitted from the light emitting device 90 including a pointer or the like located at a position away from the display surface 12 is applied to the display surface 12, it is possible to detect from the outside. Although the example which read the information of was shown, it is not restricted to this. For example, the light-emitting device 90 may function as an input pen having a light-emitting function, and information from the outside may be read by detecting the approach or contact of the light-emitting device 90 including the input pen to the display surface. . That is, the display device may function as a touch panel. In such an embodiment, the amount of luminous power of the light emitting device composed of the input pen is small compared to the light emitting output of the light emitting device composed of the pointer. In this respect, it is possible to further reduce the power consumption of the display device 10 and contribute to energy saving. Also in such an example, since the first optical sensor 81 receives light in a specific wavelength range that has passed through the optical filter unit 61 having excellent wavelength selective transmission, it is the same as in the above-described embodiment. The effect of this can be obtained.

  In the above-described embodiment, an example in which information is read by monitoring the amount of light received by the first optical sensor 81 of light in a specific wavelength region emitted from the light emitting device 90 separate from the display device 10. Although shown, it is not limited to this. As shown in FIG. 9, by detecting the amount of light received by the first optical sensor 81 of light in a specific wavelength region that is emitted by the surface light source device 30 and then reflected by the detection object 91 such as a finger, the detection target is detected. The contact or approach of the body 91 to the display surface may be detected, thereby reading the information. That is, the display device may function as a touch panel. Also in such an example, since the first optical sensor 81 receives light in a specific wavelength range that has passed through the optical filter unit 61 having excellent wavelength selective transmission, it is the same as in the above-described embodiment. The effect of this can be obtained.

  Furthermore, in the above-described embodiment, an example in which only green light is emitted from the light emitting device 90 as visible light in a specific wavelength range has been described, but the present invention is not limited thereto. For example, infrared light may be further emitted from the light emitting device 90 as light in the second specific wavelength range different from the wavelength range of the green light. Further, for example, in the modification shown in FIG. 9, infrared light may be further emitted from the surface light source device 30 as light of the second specific wavelength as well as visible light. As an example of the spectral intensity distribution of sunlight as shown in FIG. 7, sunlight, illumination light, etc. contain infrared rays, and the relative light quantity is small. Further, since infrared rays are invisible rays and are not visually recognized by an observer, the color reproducibility of image light observed by an observer is not adversely affected. From these points, it is preferable to use infrared rays as signal light that passes through the optical filter unit 61 and is received by the first optical sensor 81. When infrared light is used as signal light, a crystalline silicon light sensor that is highly sensitive to infrared light is used instead of the amorphous silicon light sensor, for example, single crystal silicon having the sensitivity characteristics shown in FIG. An optical sensor can be used as the first to third optical sensors 81, 82, 83.

  Moreover, in such a modification, in order that the optical filter part 61 can permeate | transmit infrared light with green light further, the pigment contained in the optical filter part 61 demonstrated in embodiment mentioned above. It is preferable to remove the black pigment from the combination. That is, in order to allow infrared light to pass through the optical filter unit 61 so that the first optical sensor 81 facing the optical filter unit 61 can detect infrared rays with high sensitivity, the organic pigment included in the optical filter unit 61 is used. It is preferable to use a combination of an isoindoline-based yellow pigment and a metal phthalocyanine-based blue pigment, and a diketopyrrolopyrrole-based red pigment may be further used in combination. In this case, according to the above blending ratio, the maximum transmittance of the optical filter unit 61 for light having a wavelength of 380 nm to 500 nm is 1% or less, further 0.5% or less, and the wavelength is 550 nm or more and 630 nm or less. The maximum transmittance of the optical filter unit 61 for light that is 1% or less, further 0.5% or less, and the maximum transmittance of the optical filter unit 61 for light having a wavelength of 630 nm or more and 750 nm or less is 2%. Below, the high transmittance | permeability with respect to the light of an infrared wavelength range is realizable, maintaining at 1% or less further. Specifically, the transmittance of the optical filter unit 61 for light having a wavelength of 830 nm can be set to 70% or more, and further 75% or more. Further, the maximum transmittance of the optical filter unit 61 for light having a wavelength of 830 nm or more and 880 nm or less could be 85% or more.

  The transmittance of an optical element including a plurality of pigments that absorb visible light tends to increase as the wavelength shifts to the longer wavelength side in the infrared region. Strictly speaking, the transmittance of the optical element increases as the wavelength shifts to about 900 nm on the long wavelength side in the infrared region, and thereafter has a substantially constant high transmittance on the long wavelength side (later See FIG. 10 to be referred to). Therefore, when the transmittance of the optical filter unit 61 for light having a wavelength of 830 nm is 70% or more due to the combination of pigments described above, the optical filter unit 61 is 70 for light having a wavelength longer than 830 nm. % Of the transmittance tends to be exhibited. The maximum transmittance of the optical filter unit 61 for light having a wavelength of 830 nm or more and 880 nm or less is 85% or more. For this reason, the optical filter unit 61 transmits infrared rays with an extremely high transmittance, so that the first optical sensor 81 facing the optical filter unit 61 can receive a large amount of infrared rays.

  In addition, when the light-emitting source that emits infrared light includes a light-emitting diode (LED) that can realize energy saving, among various light-emitting diodes that emit light in the infrared region, it is actually applicable from the viewpoint of manufacturing cost. What can be sufficiently separated from ambient light is a light-emitting diode that emits infrared rays with a wavelength of 830 nm or more, and typically a light-emitting diode that emits infrared rays with a wavelength of 830 nm or more and 880 nm or less.

  Therefore, when the transmittance of the optical filter unit 61 for light having a wavelength of 830 nm is 70% or more, the infrared light is separated from the ambient light and is received by the first optical sensor 81 very efficiently. It becomes like this. In particular, the present inventors have confirmed that when the transmittance of the optical filter unit 61 for light having a wavelength of 830 nm is 75% or more, or for light having a wavelength of 830 nm or more and 880 nm or less. When the maximum transmittance of the filter unit 61 is 85% or more, the first optical sensor 81 facing the optical filter unit 61 can receive infrared rays with extremely excellent sensitivity.

  In addition, based on the difference between the transmittance of green light in the optical filter unit 61 and the transmittance of infrared light in the optical filter unit 61, the amount of light received by the first optical sensor 81 is greatly different. As a result, visible light (green light) in the first specific wavelength range and infrared light in the second specific wavelength range can be distinguished and detected. In this case, various information can be read by the display device 10, for example, information can be read by distinguishing the operator of the light emitting device.

  Further, regardless of the difference in transmittance between the first specific wavelength band light and the second specific wavelength band light in the optical filter unit 61, the amorphous silicon optical sensor and the crystalline silicon are located at the positions of the respective optical sensors 61, 62, 63. By arranging both optical sensors, it is possible to distinguish and detect the first specific wavelength band light and the second specific wavelength band light. Alternatively, a part of the first optical sensor 81 disposed to face the optical filter unit 61 is extremely excellent for a wavelength range of 500 nm to 550 nm in order to detect green light in the first specific wavelength range. In order to detect infrared rays in the second specific wavelength region, the rest of the first photosensor 81, which is composed of an amorphous silicon photosensor exhibiting high sensitivity, is disposed opposite to the optical filter unit 61. You may comprise from the crystalline silicon optical sensor (single crystal silicon optical sensor) which exhibits the extremely outstanding sensitivity. Further, a black pigment is mixed in a part of the optical filter unit 61 and green light is detected by the first optical sensor 81 facing the optical filter unit 61, and a black pigment is mixed in the rest of the optical filter unit 61. Instead, the first optical sensor 81 facing the optical filter unit 61 may detect infrared rays.

  In the above-described embodiment, examples of the physical property values (spectral transmittance) of the black matrix 58 and the light shielding unit 62 and the pigments included in the black matrix 58 and the light shielding unit 62 have been described. The physical property values of the light shielding unit 62 and the pigments included in the black matrix 58 and the light shielding unit 62 are not limited to the above-described examples.

  Furthermore, in the above-described embodiment, an example in which any one of the optical sensors 81, 82, and 83 is provided for one sub-pixel unit SP is shown, but the present invention is not limited thereto. For example, the number of the optical sensors 81, 82, 83 is determined according to the position specifying accuracy when specifying the irradiation position from the light emitting device 90 such as a pointer on the display surface 12 or the contact (approaching) position of the detection target 91. You may make it increase / decrease. Specifically, when the position specifying accuracy required for the display device is not high, the number of optical sensors can be reduced. In the above-described embodiment, an example in which one second optical sensor 82 is associated with one first optical sensor 81 is not limited thereto. A plurality of second light sensors 82 arranged close to each other may be associated with one first light sensor 81, or a plurality of first light sensors 81 may be associated with a plurality of first light sensors 81. One second optical sensor 82 arranged at a position close to all of the sensors 81 may be associated. Similarly, although an example in which one third optical sensor 83 is associated with one first optical sensor 81 is shown, the present invention is not limited to this.

  Furthermore, in the above-described embodiment, the example in which the liquid crystal display device (liquid crystal display panel) is configured using the color filter substrate 50 has been described, but the present invention is not limited thereto. By using the color filter substrate 50 described above, a display device other than the liquid crystal display device, for example, an EL display device or a plasma display can be configured.

  In addition, although the some modification with respect to embodiment mentioned above was demonstrated above, naturally, it is also possible to apply combining several modifications suitably.

  EXAMPLES Hereinafter, although this invention is demonstrated in detail using an Example, this invention is not limited to this Example.

<Color filter substrate>
According to Examples 1 and 2 including a base material, a black matrix formed on the base material, an optical filter portion, a red colored portion, a green colored portion, and a blue colored portion as follows. A color filter substrate and a color filter substrate according to Comparative Example 1 were produced.

  Note that the color filter substrate according to Examples 1 and 2 and the color filter substrate according to Comparative Example 1 differ only in the pigment contained in the optical filter portion, and the other components are the same in the same manufacturing method. It produced so that it might have.

  Specifically, a pigment-dispersed resist coating film is first formed on a glass substrate, and then the black matrix is formed on the glass substrate by patterning the pigment-dispersed resist coating film using photolithography technology. Formed. In the patterning, through holes for forming each colored portion and through holes for forming the optical filter portion are formed in the black matrix. Then, each coloring part and the optical filter part were produced in the through-hole of the black matrix, and the color filter substrate according to each example and each comparative example was obtained. Each colored portion and the optical filter portion, like the black matrix, form a pigment-dispersed resist coating film on a glass substrate, and then pattern the pigment-dispersed resist coating film using photolithography technology, Produced.

  Each pigment-dispersed resist coating film for producing an optical filter part, a colored part and a black matrix was formed by applying a resin composition on a glass substrate. Each resin composition for producing an optical filter part, a colored part, and a black matrix includes, in addition to a pigment, a dispersant for dispersing the pigment, a resin for improving plate-making property and flatness, and a crosslinking reaction. A monomer for generating, an initiator for initiating photocuring, an activator for improving coatability, and a coupling material for improving the adhesion between the pigment-dispersed resist coating film and the substrate. I included it.

In the color filter substrate according to Examples 1 and 2 and Comparative Example 1, the combinations of pigments used for producing the optical filter portion were as follows. In the following, the blending ratio is a ratio with respect to the total mass of pigments contained in the optical filter portion of each color filter substrate. The pigment concentration (resist solid content ratio) in each resin composition was 33% in Example 1, 42% in Example 2, and 37% in Comparative Example 1.
Example 1 (Pigment concentration: 33%)
・ Pigment Red 254 (PR254) 10% by mass
・ Pigment Blue 15: 6 (PB15: 6) 30% by mass
・ Pigment Yellow 139 (PY139) 45% by mass
・ Black pigment 15% by mass
Example 2 (Pigment concentration: 42%)
・ Pigment Red 254 (PR254) 15% by mass
・ Pigment Blue 15: 6 (PB15: 6) 40% by mass
・ Pigment Yellow 139 (PY139) 45% by mass
○ Comparative Example 1 (Pigment concentration: 37%)
・ Pigment Red 254 (PR254) 35% by mass
・ Pigment Blue 15: 6 (PB15: 6) 35% by mass
・ Pigment Violet 23 (PV23) 5% by mass
・ Pigment Yellow 150 (PY150) 25% by mass

<Transmittance distribution>
The spectral transmittance of the light shielding part (a part of the black matrix) of the color filter substrate according to Examples 1 and 2 and Comparative Example 1 was measured according to JIS-R-3106. For measurement of spectral transmittance, LAMBDA 19 manufactured by PERKIN ELMER was used. The spectral transmittances of the optical filter portions obtained for the color filter substrates according to Examples 1 and 2 and Comparative Example 1 are shown in FIGS. In addition, regarding the optical filter portion of the color filter substrate according to Examples 1 and 2 and Comparative Example 1, the maximum transmittance in the wavelength region of 380 nm to 500 nm, the maximum transmittance in the wavelength region of 550 nm to 630 nm, 630 nm or more Table 2 shows the maximum transmittance at a wavelength region of 750 nm or less, the transmittance at a wavelength of 530 nm, and the transmittance at a wavelength of 830 nm.

  For the color filter substrates according to Example 1 and Example 2, the transmittance of the optical filter part with respect to light having a wavelength of 380 nm or more and 550 nm or less was less than 0.5%. For the color filter substrate according to Comparative Example 1, the transmittance of the optical filter portion exceeded 1.0% in the wavelength range of 380 nm to 500 nm. In the color filter substrates according to Example 1 and Example 2, the transmittance of the optical filter part with respect to light having a wavelength of 550 nm or more and 630 nm or less was less than 0.5%. For the color filter substrate according to Comparative Example 1, the transmittance of the optical filter portion exceeded 0.5% in the wavelength range of 550 nm to 630 nm. Furthermore, for the color filter substrates according to Example 1 and Example 2, the transmittance of the optical filter part with respect to light having a wavelength of 630 nm or more and 750 nm or less was less than 1.0%. For the color filter substrate according to Comparative Example 1, the transmittance of the optical filter portion exceeded 1.0% in the wavelength range of 630 nm to 750 nm.

  The transmittance of the optical filter portion for light having a wavelength of 530 nm was close to 0% in the color filter substrate according to Comparative Example 1. On the other hand, for the optical filter portion of the color filter substrate according to Example 1 and Example 2, the transmittance of light having a wavelength of 530 nm is a value that allows the light to be detected in a display device incorporating each color filter. It was.

  With respect to the optical filter portion of the color filter substrate according to Example 2, the transmittance of light having a wavelength of 830 nm was such a value that the light could be detected in a display device incorporating the color filter.

DESCRIPTION OF SYMBOLS 10 Display apparatus 20 Control apparatus 22 Image | video information processing part 24 Calculation part 30 Surface light source device (backlight)
40 Display panel 45 Liquid crystal layer 50 Color filter substrate 51 Base material 52 Colored portion (colored layer)
52R Red colored portion 52G Green colored portion 52B Blue colored portion 58 Black matrix 61 Optical filter portion (specific wavelength transmission layer)
62 light-shielding part 63 light transmission part 70 back side substrate 71 base material 81 first optical sensor (optical sensor)
82 Second optical sensor 83 Third optical sensor 90 Light emitting device 91 Detected object (detected object)

Claims (18)

A color filter substrate that is disposed to face a back side substrate having a photosensor and that can form a display device that can read information from the outside based on an output from the photosensor, with the back side substrate. And
A substrate;
A colored portion formed on the substrate, the colored portion defining a pixel region through which video light is transmitted; and
An optical filter unit formed on the base material, the optical filter unit that comes to face the optical sensor when a color filter substrate is disposed facing the back side substrate, and
The optical filter portion selectively transmits visible light in a specific wavelength range in which the optical sensor has sensitivity,
A color filter substrate, wherein a transmittance of the optical filter unit with respect to light having a wavelength of 830 nm is 70% or more. A color filter substrate that is disposed to face a back side substrate having a photosensor and that can form a display device that can read information from the outside based on an output from the photosensor, with the back side substrate. And
A substrate;
A colored portion formed on the substrate, the colored portion defining a pixel region through which video light is transmitted; and
An optical filter unit formed on the base material, the optical filter unit that comes to face the optical sensor when a color filter substrate is disposed facing the back side substrate, and
The optical filter portion selectively transmits visible light in a specific wavelength range in which the optical sensor has sensitivity,
The optical filter portion includes an isoindoline-based yellow pigment and a metal phthalocyanine-based blue pigment,
A color filter substrate characterized by the above.   The color filter substrate according to claim 2, wherein a transmittance of the optical filter unit with respect to light having a wavelength of 830 nm is 70% or more. The specific wavelength region is a wavelength region in the range of 500 nm or more and 550 nm or less.
The color filter substrate according to claim 1, wherein the color filter substrate is a color filter substrate. The maximum transmittance of the optical filter unit for light having a wavelength of 380 nm to 500 nm is 1% or less,
The maximum transmittance of the optical filter part for light having a wavelength of 550 nm or more and 630 nm or less is 1% or less;
The maximum transmittance of the optical filter part for light having a wavelength of 630 nm or more and 750 nm or less is 2% or less,
The color filter substrate according to any one of claims 1 to 4, characterized in that. The isoindoline-based yellow pigment is PY139,
The metal phthalocyanine-based blue pigment is at least one selected from the group consisting of PB1, PB15: 1, PB15: 3 and PB15: 6.
The color filter substrate according to claim 2. For the total mass of pigments contained in the optical filter part,
30% by mass or more and 60% by mass or less of the isoindoline-based yellow pigment,
The metal phthalocyanine-based blue pigment is contained in an amount of 25% by mass to 50% by mass,
The color filter substrate according to claim 2, wherein the color filter substrate is a color filter substrate. The optical filter portion further includes a diketopyrrolopyrrole red pigment,
The color filter substrate according to claim 2, 6 or 7. The isoindoline-based yellow pigment is PY139,
The metal phthalocyanine-based blue pigment is at least one selected from the group consisting of PB1, PB15: 1, PB15: 3 and PB15: 6,
The diketopyrrolopyrrole red pigment is PR254,
The color filter substrate according to claim 8. For the total mass of pigments contained in the optical filter part,
30% by mass or more and 60% by mass or less of the isoindoline-based yellow pigment,
The metal phthalocyanine-based blue pigment is contained in an amount of 25% by mass to 50% by mass,
The diketopyrrolopyrrole red pigment is contained in an amount of more than 0% by mass and 15% by mass or less.
The color filter substrate according to claim 8, wherein the color filter substrate is a color filter substrate. The optical filter part further includes a black pigment,
The color filter substrate according to any one of claims 2, 6 to 10, wherein: The black pigment is included in excess of 0% by mass and 20% by mass or less, based on the total mass of the pigments included in the optical filter part
The color filter substrate according to claim 11. Further comprising a black matrix formed on the substrate,
The optical filter portion is formed in a through hole that penetrates the black matrix,
The black matrix comes to face a second photosensor separate from the photosensor provided on the backside substrate when a color filter substrate is disposed facing the backside substrate.
The color filter substrate according to claim 1, wherein the color filter substrate is a color filter substrate. The optical filter portion is surrounded by the black matrix from the entire periphery on the base material,
The maximum transmittance of the black matrix for light having a wavelength of 380 nm or more and 1000 nm or less is 0.05% or less;
The color filter substrate according to claim 13. The optical filter portion is surrounded by the black matrix from the entire periphery on the base material,
The black matrix includes at least one selected from the group consisting of a carbon-based pigment, a red pigment, a yellow pigment, and a violet pigment, and a titanium-based pigment.
The color filter substrate according to claim 13, wherein the color filter substrate is a color filter substrate. A light transmissive portion comprising a through hole penetrating the black matrix;
When the color filter substrate is disposed to face the back side substrate, the light transmission unit is provided on a third photo sensor that is separate from the photo sensor and the second photo sensor provided on the back side substrate. To face each other,
The color filter substrate according to claim 13, wherein the color filter substrate is a color filter substrate. A display panel having a back side substrate having an optical sensor and a color filter substrate disposed to face the back side substrate;
A control device connected to the optical sensor,
The control device is configured to read information from the outside based on an output from the optical sensor,
The color filter substrate is the color filter substrate according to any one of claims 1 to 16,
A display device characterized by that. The optical sensor is an optical sensor made of amorphous silicon.
The display device according to claim 17.

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