JP2014115662A - Substrate, optical filter part, and display divice - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a color filter substrate for a display device capable of contributing to high-accuracy reading of information from the outside.SOLUTION: A substrate 50 is disposed opposite to a back substrate 70 comprising an optical sensor 81. A substrate comprises: base material 51; and an optical filter part 61 formed at a position to confront the optical sensor. The maximum transmittance of an optical filter part for light with wavelength of 380 to 630 nm is 1% or less. The maximum transmittance of the optical filter part for light with wavelength of 630-750 nm is 3% or less. Transmittance of the optical filter part for light with wavelength of 830 nm is 85% or more.

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.

  At present, a touch panel is widely used as an input unit for various devices in which a display device having a display panel such as a liquid crystal display panel is incorporated, for example, a ticket vending machine or an ATM device. The touch panel can detect that an object to be detected (detected object) such as a finger of an operator's hand or a dedicated input means is in contact with or approaching the display surface of the display device. It is also possible to specify the position on the display surface that is touching or approaching. For this reason, the touch panel is used as a means that can directly input information related to the display content of the display device.

  Many touch panels (a kind of information reading device) that are actually used are of a type called a capacitance type or a resistance film type. Capacitance type and resistive film type touch panels have a certain degree of detection accuracy, but the manufacturing process is complicated and relatively expensive. Also, these types of touch panels are usually manufactured separately from the display panel and overlaid on the display panel. However, in this aspect, there is a problem that the interface through which the image light from the display device is transmitted increases, and the image quality of the image displayed by the display device is deteriorated.

  In order to solve such conventional problems, for example, as disclosed in Patent Document 1, an optical sensor type information reading device (typically, a touch panel) has recently been developed. An optical sensor type touch panel includes a large number of optical sensors that output an amount of current corresponding to the amount of received light, and detects contact or approach of a detection target based on the amount of output current from the optical sensor. Read information. A display panel of a display device usually includes a back side substrate on which switching elements such as TFTs are formed. For this reason, it becomes possible to form an optical sensor on the back side substrate in accordance with the formation of the switching element. As a result, the optical sensor touch panel function (information reading function) can be incorporated into the display device at low cost.

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 threshold of evaluation for the output current from the optical sensor is also raised, but this measure has a function (information reading function) for detecting contact or approach of the detected object. Sensitivity will decrease.

  For this reason, in order to improve the accuracy of the detection object detection function (information reading function), it is necessary to enhance the light emission output of light (signal) used for detection of the detection object. However, measures such as enhancing the light emission output of light as a signal lead to deterioration of energy efficiency. Therefore, 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.

The 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 portion formed on the base material, and the optical filter portion that faces the optical sensor when a color filter substrate is disposed to face the back-side substrate. The maximum transmittance of the optical filter unit for light having a wavelength of 380 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 3% or less;
The transmittance of the optical filter unit for light having a wavelength of 830 nm is 85% or more.

  In the color filter substrate according to the present invention, the maximum transmittance of the optical filter unit with respect to light having a wavelength of 380 nm or more and 630 nm or less may be 0.5% or less.

  In the color filter substrate according to the present invention, the transmittance of the filter unit for light having a wavelength of 830 nm may be 90% or more.

  Furthermore, in the 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 92% or more.

  Furthermore, in the color filter substrate according to the present invention, the optical filter unit may selectively transmit light in a specific wavelength range outside the visible light wavelength range.

  Furthermore, in the color filter substrate according to the present invention, the optical filter portion may include an isoindoline-based yellow pigment, a phthalocyanine-based blue pigment, and a diketopyrrolopyrrole-based red pigment. In the color filter substrate according to the present invention, the isoindoline color pigment is PY139, the phthalocyanine blue pigment is PB15: 6, and the diketopyrrolopyrrole red pigment is PR254. Also good. Further, in such a color filter substrate according to the present invention, the isoindoline-based yellow pigment is contained in an amount of 25% by mass to 50% by mass with respect to the total mass of the pigments included in the optical filter part, A blue pigment may be contained in an amount of 25% by mass to 40% by mass, and the diketopyrrolopyrrole red pigment may be contained in an amount of 5% by mass to 50% by mass.

  Further, in the color filter substrate according to the present invention, the optical filter portion includes an isoindoline-based yellow pigment, a quinacridone-based purple pigment, a phthalocyanine-based blue pigment, and a diketopyrrolopyrrole-based red pigment. You may make it. In the color filter substrate according to the present invention, the isoindoline color pigment is PY139, the quinacridone violet pigment is PV23, the phthalocyanine blue pigment is PB15: 6, and the diketopyrrolopyrrole. The system red pigment may be PR254. Further, in such a color filter substrate according to the present invention, the isoindoline-based yellow pigment is contained in an amount of 25% by mass to 50% by mass with respect to the total mass of the pigment contained in the optical filter part, Purple pigment is contained in an amount of 8% by mass to 30% by mass, the phthalocyanine blue pigment is contained in an amount of 25% by mass to 40% by mass, and the diketopyrrolopyrrole red pigment is contained in an amount of 5% by mass to 50% by mass. Also good.

  Further, the color filter substrate according to the present invention further comprises a black matrix formed on the base material, the optical filter portion is formed in a through-hole penetrating the black matrix, and the black matrix is When the color filter substrate is disposed to face the back side substrate, the color sensor substrate may face a second photo sensor separate from the photo sensor provided on the back side substrate.

  Furthermore, in the 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 maximum of the black matrix for light having a wavelength of 380 nm to 1000 nm. The transmittance may be 0.05% or less.

  Furthermore, in the 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 includes a carbon-based pigment, a red pigment, a yellow pigment, and One or more selected from the group consisting of purple pigments and titanium pigments may be included.

  Furthermore, the color filter substrate according to the present invention further includes a light transmission portion including a through hole penetrating the black matrix, and the light transmission portion is disposed when the color filter substrate is disposed to face the back side substrate. In addition, the photosensor and the second photosensor provided on the back substrate may face a separate third photosensor.

  Furthermore, in the color filter substrate according to the present invention, the optical sensor may be an optical sensor made of crystalline silicon.

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 any of the color filter substrates according to the present invention described above.

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

  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. It may be.

  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 explaining an example of a function of detecting contact or approach of the detection target to the display surface. FIG. 4 is a graph showing an example of the wavelength sensitivity distribution of the crystalline silicon photosensor. 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 of detecting light emitted from the light emitting device. 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. In the present embodiment, the surface light source device 30 emits not only visible light but also infrared light. For example, when the light source incorporated in the surface light source device is formed of a light emitting diode (LED), typically, light of 830 nm or more is emitted from the surface light source device 30.

  The display device 10 shown in FIGS. 1 to 3 has not only a display function for displaying an image on the display surface 12, but also a finger 90a (see FIG. 3) of a human hand and dedicated input means (input pen). ) Or the like, it can be detected that the detected object 90 (the detected object 90) has contacted or approached the display surface 12, and further, the detected object 90 has contacted or approached any position on the display surface 12. It has a function that can detect whether or not. That is, the display device 10 not only functions as an output device that outputs information such as characters and drawings as video, but also functions as an input unit that inputs information corresponding to the content displayed on the display surface 12. . At this time, the display surface 12 of the display device 10 functions as an input surface (touch surface, contact surface) of the input means (touch panel device).

  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 contact or approach of the detected object 90 to the display surface 12 of the display device 10 and is on the display surface 12 that the detected object 90 contacts or approaches. An example in which the input of information from the outside via the display surface 12 is read by detecting the position will be described.

  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 detection object detection function (information reading function), and the display panel 40 realizes a display function for displaying an image correspondingly. And a function for realizing an object 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 detection target 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 detected object detection function (information reading function) will be described. In order for the display device 10 to realize the detection object detection function, the back side substrate 70 of the display panel 40 has a large number of optical sensors 81, 82, 83, and the color filter substrate 50 includes the optical sensors 81, 82, One of the optical filter unit 61, the light shielding unit 62, and the light transmission unit 63 is formed at a position facing 83.

  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 a single crystal silicon photosensor as an example. The single crystal silicon optical sensor has sufficient sensitivity to visible light and infrared light having a wavelength of 380 nm to 1000 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.

  The first optical sensor 81, the second optical sensor 82, and the third optical sensor 83 have the same configuration, and therefore have the same spectral sensitivity characteristics. Specifically, the first optical sensor 81, the second optical sensor 82, and the third optical sensor 83 have sufficient sensitivity to visible light and infrared light having a wavelength of 380 nm to 1000 nm. As the first optical sensor 81, the second optical sensor 82, and the third optical sensor 83, for example, a single crystal silicon optical sensor having sensitivity characteristics shown in FIG. 4 can be used.

  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 infrared rays and absorbs other light. 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 specific 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. In other words, the optical filter unit 61 includes a pigment, mainly transmits infrared rays, 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 an example of an organic pigment for selectively transmitting infrared rays, an isoindoline yellow pigment, a quinacridone purple pigment, a phthalocyanine blue pigment, and a diketopyrrolopyrrole red pigment are combined. Get used. In this combination, Pigment Yellow 139 (PY139) can be used as an isoindoline-based yellow pigment. Moreover, pigment violet 23 (PV23) can be used as a quinacridone-based purple pigment. Furthermore, copper phthalocyanine can be used as the phthalocyanine blue pigment, and in particular, pigment blue 15: 6 (PB15: 6) can be used. Furthermore, pigment red 254 (PR254) can be used as the diketopyrrolopyrrole red pigment.

  The graph of FIG. 5 shows the spectral transmittance of Pigment Yellow 139 (PY139), the spectral transmittance of Pigment Violet 23 (PV23, the spectral transmittance of Pigment Blue 15: 6 (PB15: 6), and Pigment Red 254 (PR254). 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, and Pigment Red 254 is In addition, pigment blue 15: 6 exhibits excellent light blocking properties for light having a wavelength in the range of 570 nm to 780 nm. Show.

  And the pigment violet 23 shows the outstanding light-shielding property with respect to the light which has a wavelength in the range of 520 nm or more and 570 nm or less. By adding the pigment violet 23 to the optical filter unit 61, it is possible to sufficiently shield light in a wavelength range of 520 nm or more and 570 nm or less that cannot be effectively shielded by the pigment red 254.

  Further, 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.

  The blending ratio of each pigment is 25% by mass or more and 50% by mass or less of isoindoline-based yellow pigment and 8% of quinacridone-based purple pigment with respect to the total mass of the pigment included in the optical filter unit 61. The phthalocyanine-based blue pigment is contained in an amount of 25% by mass to 40% by mass and the diketopyrrolopyrrole red pigment is contained in an amount of 5% by mass to 50% by mass. 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 or more and 630 nm or less is 1% or less, and further 0.5% or less. I was able to. Further, the maximum transmittance of the optical filter unit 61 for light having a wavelength of 630 nm or more and 750 nm or less could be 3% or less. Furthermore, the transmittance of the optical filter unit 61 for light having a wavelength of 830 nm could be 85% or more, and further 90% or more. In addition, 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 92% or more.

  That is, the optical filter unit 61 can sufficiently shield light having a shorter wavelength than the infrared wavelength region. In particular, as an example, as shown in FIG. 7 showing the spectral intensity distribution of sunlight, environmental light such as sunlight and illumination light contains a lot of light having a wavelength in the range of 380 nm to 630 nm. According to the optical filter unit 61 having the above-described pigment configuration, light in the wavelength range of 380 nm to 630 nm, which occupies most of the environmental light, can be shielded very effectively.

  On the other hand, light emitting diodes (LEDs) have attracted attention as light sources that emit light from the viewpoint of energy saving. Among various light-emitting diodes that emit light in the infrared region, those that can be applied to mass-produced display devices and can sufficiently separate from ambient light have a wavelength of 830 nm. The light-emitting diode emits light with a wavelength of 880 nm or less.

  In general, 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). And according to the combination with the pigment described above, the transmittance of the optical filter unit 61 for light having a wavelength of 830 nm is stably 85% or more, and can be 90% or more. In addition, the maximum transmittance of the optical filter unit 61 for light having a wavelength of 830 nm or more and 880 nm or less can be set to 92% or more. Therefore, according to the optical filter unit 61 composed of the combination of pigments described above, infrared light from a light emitting diode that can be used for actual mass production is transmitted with extremely high transmittance, while being contained in a large amount in ambient light. Visible light can be effectively shielded. That is, according to the optical filter unit 61, it is possible to selectively extract infrared rays from the light-emitting mode that can be used for actual mass production, by separating them from the ambient 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. However, “light shielding” here means not only to reduce the transmittance to 0% but also to reduce the maximum transmittance of the light shielding portion 62 for light of 380 nm to 1000 nm.

  The light shielding unit 62 is formed in a region on the first base 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. . As shown in FIG. 2, in the present embodiment, the light shielding unit 62 is configured by a part of the black matrix 58.

  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. Can be done. 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). For visible light and infrared light having a wavelength of 700 nm or more, the transmittance of the light-shielding part 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, since the entire periphery of the optical filter unit 61 is surrounded by the black matrix 58 having excellent light shielding properties, the wavelength selective transmission 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. Note that, from the viewpoint of improving the detection accuracy of the detection target 90, the first to third optical sensors 81, 82, and 83 associated with each other are preferably 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 configured as described above has a highly sensitive and highly accurate detection target detection function (information reading function), and functions as a touch panel, for example. Hereinafter, an operation related to the detected object detection function of the display device 10 when the display device 10 functions as a touch panel 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, the surface light source device 30 also emits infrared light that is difficult to be observed by an observer observing the display device 10. And the optical filter part 61 permeate | transmits infrared rays selectively. For this reason, the infrared light emitted from the surface light source device 30 passes through the optical filter unit 61 and is emitted from the display panel 30 to the viewer side. However, as shown in FIG. 3, when the detected object 90 comes into contact with or approaches the display surface 12, the infrared light emitted from the display panel 30 is reflected by the detected object 90, and the traveling direction is changed to the surface light device side. Wrap around. In this way, the infrared light reflected by the detection target 90 is transmitted again in the reverse direction through the optical filter unit 61, and reaches the first optical sensor 81 provided immediately below the optical filter unit 61 (on the surface light source device side). Received light. That is, the amount of light received by the first optical sensor 81 increases as the detection object 90 approaches or contacts the position on the display surface 12 that the first optical sensor 81 faces. The calculation unit 24 of the control device 20 monitors or changes the output current amount of the first photosensors 81 provided in large numbers in the display panel 40, so that the detection target 90 is in contact with or close to the display surface 12. This is detected together with the position on the display surface 12 with which the detected object 90 is in contact or approaching.

  In FIG. 3 and FIG. 9 referred later, visible light is indicated by a thick arrow, and light in a specific wavelength region (infrared 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, as shown in FIG. Visible light 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 contact or approach of the detection object 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 photosensor 81 is not caused only by the reflected light from the detection target 90, and therefore, the contact of the detection target 90 based only on the output current of the first photosensor 81. Or, if the approach is detected, the reliability of the detection accuracy is lowered.

  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), basically, the reflected light reflected by the detection target 90 is not received. 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 contact or approach of the detection target 90, not only the output current from the first photosensor 81 but also the second photosensor associated with the first photosensor. Considering the output current from 82, the contact or approach of the detection object 90 to the display surface 12 can be determined 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 the detection target has touched or touched 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, it can be configured to determine that the detected object has contacted or contacted the position on the display surface 12 facing the target first optical sensor 81.

  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 of the spectral intensity distribution of sunlight, infrared rays are included in sunlight and illumination light. Therefore, in a bright environment, a larger amount of infrared 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 photosensor 81 increases regardless of the contact or approach of the detection object to the display surface 12.

  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 contact or approach of the detection target 90, not only the output current from the first photosensor 81 but also the third light associated with the first photosensor. By considering the output current from the sensor 83, the contact or approach of the detected object 90 to the display surface 12 can be determined 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 the detection target has touched or touched the 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, it can be configured to determine that the detected object has contacted or contacted the position on the display surface 12 facing the target first optical sensor 81.

  By the way, as shown in FIG. 7 as an example of the spectral intensity distribution of sunlight, sunlight, illumination light, etc. contain infrared rays, and the relative light quantity is small. On the other hand, sunlight, illumination light, and the like contain a lot of visible light, but most of the visible light is absorbed by the optical filter unit 61. Therefore, it is possible to prevent the optical sensor from sensing a large amount of light that is not related to the contact (approach) of the detected object included in the ambient light as reflected light from the detected object 90. . 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 light in a specific wavelength range that is signal light received by the optical sensor (first optical sensor 81 in the present embodiment).

  However, on the other hand, as shown in FIG. 4 as an example of the sensitivity ratio of a single crystal silicon photosensor, a photosensor generally used in a photosensor-type touch panel can detect light in the infrared wavelength region. It does not have a strong sensitivity only, but has a strong sensitivity to light in a wide visible light range. Therefore, if the optical filter unit 61 has sufficient wavelength selective transparency and cannot block visible light, the first optical sensor 81 detects visible light contained in a large amount in ambient light. It is received as reflected light from the body 90. If the optical filter 61 has sufficient wavelength selective transmission and cannot transmit infrared light, correction is performed based on the output current from the second and third optical sensors 82 and 83. Even if this is the case, the reflected light from the detection object 90 cannot be distinguished from other light and detected accurately.

  For this reason, as described in the section of the prior art, when infrared light is used as light in a specific wavelength range that is signal light received by the optical sensor, for the purpose of increasing the amount of signal light, It was necessary to set a large amount of light emitted from the infrared surface light source device 30. Increasing the amount of emitted infrared light means an increase in power consumption, which also contradicts the improvement in light utilization efficiency in display devices, which has been cited as one of the important issues these days.

  In this regard, in this embodiment, the maximum transmittance of the optical filter unit 61 for light having a wavelength of 380 nm or more and 750 nm or less is sufficiently low at 3% or less. In particular, the maximum transmittance of the optical filter unit 61 for light having a wavelength of 380 nm or more and 630 nm or less that occupies most of the environmental light such as sunlight and forms most of the image light is 1% or less. As a result, light that is included in a large amount of ambient light and that makes up most of the image light is shielded by the optical filter unit 61, reflected from the detection target 90, and received from the infrared light received by the first optical sensor 81. Separated with accuracy. Further, as a result of confirmation by the present inventors, when the maximum transmittance of the optical filter unit 61 for light having a wavelength of 380 nm or more and 630 nm or less is 0.5% or less, the display device 10 is generally used. In the environment where it is expected to be disposed in the first optical sensor 81, the light included in the environmental light passing through the optical filter unit 61 has a wavelength of 380 nm or more and 630 nm or less that is negligible.

  Moreover, in this Embodiment, the transmittance | permeability of the optical filter part 61 about the light whose wavelength is 830 nm is 85% or more. And the optical filter part 61 has the tendency to exhibit the transmittance | permeability of 85% or more with respect to the light of longer wavelength than 830 nm. Moreover, 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 92% or more. For this reason, the optical filter unit 61 transmits the infrared light reflected from the detected object 90 with an extremely high transmittance, so that the first optical sensor 81 facing the optical filter unit 61 reflects from the detected object 90. A large amount of received infrared rays can be received. In particular, when the light source that emits infrared light from the surface light source device 30 is made of a light emitting diode capable of realizing energy saving, the wavelength of infrared light emitted from the surface light source device 30 is set to 830 nm or more in consideration of separation from ambient light. Typically, the infrared wavelength is 830 nm or more and 880 nm or less. Therefore, the infrared light reflected by the detection target 90 is separated from the environmental light and is received by the first optical sensor 81 very efficiently. In particular, the inventors have confirmed that when the transmittance of the optical filter unit 61 for light having a wavelength of 830 nm is 90% 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 92% or more, the first optical sensor 81 facing the optical filter unit 61 can receive infrared rays with extremely excellent sensitivity.

  As described above, according to the present embodiment, even if the light amount of the specific wavelength light (infrared ray) that is directed to the first optical sensor 81 by being reflected by the detection object 90 is small, the optical filter The infrared rays are separated from other light by the unit 61 with high efficiency. As a result, it is possible to prevent malfunction of detection of contact or approach of the detection target 90 to the display surface 12, and to detect the detection target 90 with high accuracy and to read information from the outside with high accuracy. it can.

  In particular, as a result of extensive research conducted by the inventors, the maximum transmittance of the optical filter unit 61 for light having a wavelength of 380 nm to 630 nm is 1% or less, and the wavelength is 630 nm to 750 nm. When the maximum transmittance of the optical filter unit 61 for light is 3% or less and the transmittance of the optical filter unit 61 for light having a wavelength of 830 nm is 85% or more, the optical filter unit 61 Thus, the infrared light as the reflected light from the detection target 90 can be separated from the ambient light by the optical filter unit 61 with extremely high accuracy, and the first optical sensor 81 facing the optical filter unit 61 has high sensitivity. It was confirmed that it could be detected. 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). Infrared light reflected by the detection target 90 in combination with the surface light source device 30 in which a light emitting diode is incorporated as a light source that emits infrared light. Can be detected with sufficient sensitivity by the first optical sensor 81. In the embodiment described above, the position on the display surface 12 with which the detected object 90 is in contact with or close to is detected without increasing the light emission amount of the light in the specific wavelength range from the surface light source device 30. It becomes possible to specify with extremely high accuracy. In this respect, in order to improve the detection sensitivity of the detection target 90, it is greatly different from a conventional display device that needs to increase the light emission amount of a specific wavelength region that is invisible light that cannot form an image. According to the present embodiment, the reading accuracy of the external information through the display surface 12 is improved by improving the detection accuracy of the detected object without increasing the power consumption of the display device with the external information reading function. be able to.

  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 embodiment described above, the surface light source device 30 emits infrared light that cannot form an image together with visible light that forms an image, via the optical filter unit 61 that can selectively transmit the infrared light. The example in which the detection target is detected by receiving the infrared light reflected by the detection target 90 by the first optical sensor 81 has been described. However, the present invention is not limited to this example.
For example, the object to be detected is a light emitting pen or the like having a light emitting function, and the first optical sensor 81 receives light in a specific wavelength region emitted from the object to be detected through the optical filter unit 61, thereby displaying the display surface. The contact or approach of the detection target 90 to 12 may be detected.

  In the above-described embodiment, the detection or detection of the contact or approach of the detected object 90 to the display surface 12 and the position on the display surface 12 where the detected object 90 contacts or approaches is displayed. Although an example is shown in which information from the outside via the surface 12 is read, the present invention is not limited to this. For example, as shown in FIG. 9, the first optical sensor 81 receives light in a specific wavelength region irradiated on the display surface 12 of the display device 10 from the pointer 91 having a light emitting function through the filter unit 61, By detecting the irradiation of light from the pointer 91 to the display surface 12 and / or by detecting which position on the display surface 12 is irradiated with the light from the pointer 91, Thus, information from the outside may be read.

  In these examples as well, the same effects and advantages as in the above-described embodiment, in summary, can improve the reading accuracy of external information without depending on the enhancement of the signal light emission intensity. Moreover, according to these modified examples, it is not necessary to continue to emit invisible light that cannot form an image from the surface light source device 30. In this respect, it is possible to further reduce the power consumption of the display device 10 and contribute to energy saving. Further, according to the modification example in which the irradiation light from the pointer 91 shown in FIG. 9 is detected, the operator who operates the pointer 91 receives information from the position separated from the display surface 12 of the display device 10 to the display device 10. Can be entered.

  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 to this. For example, the number of the optical sensors 81, 82, 83 is determined according to the position specifying accuracy when specifying the contact (approach) position of the detection target 90 on the display surface 12 or the irradiation position from the light emitting device such as the pointer 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 pigments contained in the optical filter part, and the others are the same using the same manufacturing method. It produced so that it might have the structure of.

  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.
○ Example 1
・ Pigment Red 254 (PR254) 30% by mass
-Pigment Blue 15: 6 (PB15: 6) 32% by mass
・ Pigment Violet 23 (PV23) 8% by mass
・ Pigment Yellow 139 (PY139) 30% by mass
Example 2
・ Pigment Red 254 (PR254) 5% by mass
・ Pigment Blue 15: 6 (PB15: 6) 30% by mass
・ Pigment Violet 23 (PV23) 20% by mass
・ Pigment Yellow 139 (PY139) 45% by mass
○ Comparative Example 1
・ 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. Further, 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 630 nm, the maximum transmittance in the wavelength region of 630 nm to 750 nm, and 830 nm The transmittance at wavelengths was investigated and shown in Table 2.

  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 630 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 greatly exceeded 1.0% in the wavelength range of 380 nm to 400 nm. In the color filter substrate according to Comparative Example 1, the transmittance of the optical filter portion locally increases even in a wavelength range of 470 nm to 500 nm, and the maximum value of the transmittance in this range is 1.0%. Exceeded.

  On the other hand, the light-shielding property of the optical filter unit with respect to light in the wavelength region of 630 nm or more and 750 nm or less is slightly lower in the color filter substrate according to Comparative Example 1 than in the color filter substrate according to Example 1 and Example 2. But it was excellent.

  As shown in FIG. 11, in each color filter substrate, the transmittance of the optical filter portion increased as the wavelength increased for light in the wavelength region of 750 nm or more. In addition, the color filter substrate according to Example 1 and Example 2 exhibited better translucency than the color filter substrate according to Comparative Example 1 over the entire wavelength range of 750 nm or more. There are several types of light-emitting diodes that emit light in the infrared region that are actually suitable for mass production of display devices, etc., but in order to separate infrared light emitted from these light-emitting diodes from external light such as sunlight. The shortest wavelength of an excellent light emitting diode is 830 nm at present. In the color filter substrate according to Comparative Example 1, it was confirmed that the transmittance of infrared light emitted from a light emitting diode suitable for mass production (that is, the transmittance for light of 830 nm) might be lower than 85%. It was. On the other hand, in the color filter substrate according to Examples 1 and 2, it was confirmed that infrared light emitted from a light-emitting diode suitable for mass production can be transmitted with a transmittance of 90%.

<Output current amount>
By producing the display device according to the above-described embodiment using the color filter substrates according to Examples 1 and 2 and Comparative Example 1, display devices according to Examples 1 and 2 and Comparative Example 1 were obtained, respectively. . In the state where the display devices according to Examples 1 and 2 and Comparative Example 1 are arranged under sunlight, the optical sensor is arranged in a position facing the optical filter portion of the color filter substrate in the display panel (the above-described embodiment). And the output current (noise current) from the first optical sensor. This investigation was performed in a state in which the surface light source device of the display device did not emit light, that is, in a state where light could enter the display panel only from the display surface side. The survey results are shown in the noise column of Table 2. In Table 2, the amount of output current is represented by the ratio of each measured value.

  Next, under the same conditions, that is, in a state where the surface light source device is turned off under sunlight, the display surface is irradiated with infrared rays from the light emitting device (pointer) to the display surface of each display device, and a color filter is formed in the display panel. An output current (signal current) from the optical sensor (first optical sensor in the above-described embodiment) arranged at a position facing the optical filter portion of the substrate was measured. The survey results are shown in the signal column of Table 2. In Table 2, the amount of output current is represented by the ratio of each measured value.

  Furthermore, the ratio (S / N) of the signal (S) to the nozzle (N) in Table 2 was compared. Table 1 shows S / N as a relative ratio between the display devices according to Examples 1 and 2 and Comparative Example 1.

  In the display device according to Example 1 and Example 2, compared with the display device according to Comparative Example 1, the S / N could be remarkably improved.

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 Detected object (detected object)
90a Finger 91 Pointer (light emitting device)

Claims (16)

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 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 3% or less;
The transmittance of the filter unit for light having a wavelength of 830 nm is 85% or more.
A color filter substrate characterized by the above. The maximum transmittance of the optical filter unit for light having a wavelength of 380 nm or more and 630 nm or less is 0.5% or less,
The color filter substrate according to claim 1. The transmittance of the filter unit for light having a wavelength of 830 nm is 90% or more.
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 830 nm or more and 880 nm or less is 92% or more,
The color filter substrate according to claim 1, wherein the color filter substrate is a color filter substrate. The optical filter portion includes an isoindoline-based yellow pigment, a phthalocyanine-based blue pigment, and a diketopyrrolopyrrole-based red pigment.
The color filter substrate according to claim 1, wherein the color filter substrate is a color filter substrate. The isoindoline-based yellow pigment is PY139,
The phthalocyanine blue pigment is PB15: 6,
The diketopyrrolopyrrole red pigment is PR254,
The color filter substrate according to claim 5. For the total mass of pigments contained in the optical filter part,
Containing 25% by mass or more and 50% by mass or less of the isoindoline-based yellow pigment,
The phthalocyanine-based blue pigment is contained in an amount of 25% by weight to 40% by weight,
Containing 5% by mass or more and 50% by mass or less of the diketopyrrolopyrrole red pigment,
The color filter substrate according to claim 5, wherein the color filter substrate is a color filter substrate. The optical filter part further includes a quinacridone-based purple pigment,
The color filter substrate according to claim 5. The isoindoline-based yellow pigment is PY139,
The quinacridone-based purple pigment is PV23,
The phthalocyanine blue pigment is 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,
Containing 25% by mass or more and 50% by mass or less of the isoindoline-based yellow pigment,
Containing 8% by mass to 30% by mass of the quinacridone-based purple pigment,
The phthalocyanine-based blue pigment is contained in an amount of 25% by weight to 40% by weight,
Containing 5% by mass or more and 50% by mass or less of the diketopyrrolopyrrole red pigment,
The color filter substrate according to claim 8, wherein the color filter substrate is a color filter substrate. 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 11. 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 11, 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 11, 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 14.
A display device characterized by that. A surface light source device that is disposed to face the display panel and illuminates the display panel from the back substrate side;
The surface light source device includes a light emitting diode that emits light having a wavelength of 830 nm or more.
The display device according to claim 15.

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