JP5364227B2 - Display device with reading function and electronic device using the same - Google Patents

Display device with reading function and electronic device using the same Download PDF

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JP5364227B2
JP5364227B2 JP2005206342A JP2005206342A JP5364227B2 JP 5364227 B2 JP5364227 B2 JP 5364227B2 JP 2005206342 A JP2005206342 A JP 2005206342A JP 2005206342 A JP2005206342 A JP 2005206342A JP 5364227 B2 JP5364227 B2 JP 5364227B2
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light
layer
subpixel
thin film
film transistor
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JP2006065305A (en
JP2006065305A5 (en
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舜平 山崎
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株式会社半導体エネルギー研究所
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L27/00Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
    • H01L27/28Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including components using organic materials as the active part, or using a combination of organic materials with other materials as the active part
    • H01L27/32Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including components using organic materials as the active part, or using a combination of organic materials with other materials as the active part with components specially adapted for light emission, e.g. flat-panel displays using organic light-emitting diodes [OLED]
    • H01L27/3241Matrix-type displays
    • H01L27/3244Active matrix displays
    • H01L27/3246Banks, i.e. pixel defining layers
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L27/00Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
    • H01L27/28Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including components using organic materials as the active part, or using a combination of organic materials with other materials as the active part
    • H01L27/32Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including components using organic materials as the active part, or using a combination of organic materials with other materials as the active part with components specially adapted for light emission, e.g. flat-panel displays using organic light-emitting diodes [OLED]
    • H01L27/3225OLED integrated with another component
    • H01L27/3234OLED integrated with another component the other component being an imager structure

Abstract

<P>PROBLEM TO BE SOLVED: To use a material having a light-shielding property for a bank layer surrounding the edge of a light-emitting element, thereby preventing the light which is not reflected by an object to be read out from entering an image pick-up element, and correctly reading information on the object to be read out. <P>SOLUTION: The display device mounted with the read function includes a thin film transistor and an image pick-up element provided over a substrate having an insulating surface, an insulating layer covering the thin film transistor and the image pick-up element, a light-emitting element provided over the insulating layer, and a bank layer having the light-shielding property surrounding the edge of the light-emitting element. The bank layer has an opening portion in a position overlapping with the image pick-up element. <P>COPYRIGHT: (C)2006,JPO&amp;NCIPI

Description

The present invention relates to a display device with a reading function.

The present invention also relates to an electronic device using a display device with a reading function.

In recent years, as a display device, research and development of a display device using a light emitting element typified by an electroluminescence element or the like instead of a liquid crystal display has been advanced. This display device is widely used by taking advantage of the high image quality, wide viewing angle, and thinness and lightness that do not require a backlight due to the self-luminous type.

There is a display device using such a light emitting element, in which not only a light emitting element but also an imaging element are integrated on a substrate, a display device with a reading function (see, for example, Patent Document 1). In this display device, light emitted from a light emitting element is reflected by a reading object, and the reflected light is received by an imaging device, whereby information on the reading object is read.
JP 2002-176162 A

In a display device using a light emitting element, a light emitting material corresponding to each color necessary for color display has a different current density for obtaining a predetermined luminance. Taking a light emitting material corresponding to the three primary colors of light as an example, when the same voltage is applied, the luminance decreases in the order of a green light emitting element, a red light emitting element, and a blue light emitting element. If such a light emitting material as described above is used as it is, the light emission luminance for each color varies. In addition, since white is expressed in a state where all three sub-pixels of red, green, and blue corresponding to the three primary colors of light are emitted, depending on how each sub-pixel is colored, white may be biased to red, It is biased to blue and white is not displayed correctly. As described above, when the white expression is deteriorated, a desired color cannot be obtained, and it becomes difficult to display an image expressed with an accurate gradation. Accordingly, there is a technique that improves the expression of white by correcting the number of gradations of the video signal input to the three sub-pixels of red, green, and blue to eliminate variations in emission luminance for each color (for example, patents). Reference 2). In addition, there is a technique that improves white expression by changing the power supply potential applied to each sub-pixel without correcting the video signal.
Japanese Patent Laid-Open No. 2004-4708

Note that white expression is poor when white is biased to red, white is biased to blue, or white is biased to green, making it impossible to represent white correctly.

According to the configuration of Patent Document 1, the light emitted from the light emitting element may enter the imaging element without being reflected by the reading object. This is because light emitted from the light emitting element is reflected at an interface between a medium (for example, an insulating layer) between the light emitting element and a reading object and the medium, and the reflected light enters the imaging element. by. The light that enters the image sensor should be only the light reflected by the reading object, but if such extra light enters, the information on the reading object cannot be read accurately.

In view of the above circumstances, an object of the present invention is to provide a display device with a reading function that can accurately read information of an object to be read.

According to the configuration of Patent Document 2, it is necessary to newly provide a signal correction circuit for correcting the number of gradations of the video signal. Increasing the number of ICs connected to the outside as signal correction circuits will hinder downsizing, thickness reduction, and weight reduction. In addition, when changing the power supply potential applied to each sub-pixel in order to improve the white expression, it is necessary to generate several potentials based on the power supply potential supplied from the power supply circuit, so a circuit such as a level shifter is provided. There was a need. Further, when the level shifter is not provided, it is necessary to apply different power supply potentials from the outside, so that it is necessary to increase the number of pins of the panel.

Accordingly, an object of the present invention is to provide a display device with a reading function that improves brightness variation for each color and improves white expression without correcting a video signal or increasing a power supply potential.

In the present invention, a light-blocking material is used as a partition layer surrounding an end portion of the light-emitting element. Thereby, it is possible to prevent light that has not been reflected by the reading object from entering the image sensor, and to accurately read information on the reading object.

A display device with a reading function of the present invention includes a thin film transistor and an imaging element provided over a substrate having an insulating surface, an insulating layer covering the thin film transistor and the imaging element, a light emitting element provided over the insulating layer, and a light emitting element A partition wall layer (shielding layer) having a light shielding property is provided to surround the end portion. The partition layer has an opening at a position overlapping with the imaging element.

A display device with a reading function according to the present invention includes a thin film transistor and an imaging element provided over a substrate having an insulating surface, an insulating layer covering the thin film transistor and the imaging element, a white light emitting element provided on the insulating layer, and white light emission A partition layer that surrounds the end portion of the element and has a light-shielding property, and a colored layer that is provided above the partition layer and overlaps with the white light-emitting element. The partition layer has an opening at a position overlapping the image sensor. The colored layer is not provided at a position overlapping with the imaging element.

In the display device with a reading function of the present invention, a plurality of pixels are provided over a substrate having an insulating surface, and each of the plurality of pixels includes a first sub-pixel including a first light-emitting element that emits red light, and green. A second sub-pixel including a second light-emitting element that emits blue light, a third sub-pixel including a third light-emitting element that emits blue light, and a fourth sub-pixel including an imaging element. An insulating layer is provided over the imaging element, first to third light-emitting elements are provided over the insulating layer, and a light-blocking partition layer is provided so as to surround end portions of the first to third light-emitting elements. It has been. The partition layer has an opening at a position overlapping with the imaging element.

In the display device with a reading function of the present invention, a plurality of pixels are provided over a substrate having an insulating surface, and each of the plurality of pixels includes a first sub-pixel including a first light-emitting element that emits red light, and green. A second sub-pixel including a second light-emitting element that emits blue, a third sub-pixel including a third light-emitting element that emits blue light, a fourth sub-pixel including a first imaging element, A fifth sub-pixel including two image sensors and a sixth sub-pixel including a third image sensor. An insulating layer is provided on the first to third imaging elements, the first to third light emitting elements are provided on the insulating layer, and light shielding properties are provided so as to surround the end portions of the first to third light emitting elements. A partition layer having The partition layer has an opening at a position overlapping with the imaging element.

The image sensor included in the display device with a reading function includes a crystalline semiconductor. The image sensor included in the display device with a reading function includes a P-type region, an I-type region, and an N-type region.

The present invention is characterized in that the area of the sub-pixel including the light-emitting element on the substrate is changed. In the first configuration, the area of the green subpixel is made smaller than the area of the red subpixel or the area of the blue subpixel. Then, a sub-pixel including an image sensor is provided in a portion where the area of the green sub-pixel is surplus. The second configuration makes the area of the red and green subpixels smaller than the area of the blue subpixel. Then, a subpixel including an image sensor is provided in a portion where the area of the red subpixel and the green subpixel is excessive.

With the above configuration, even if the current densities of the red, green, and blue light emitting materials are different, by changing the light emitting area, variation in light emission luminance for each color can be improved and white expression can be improved. Further, instead of further providing a sub-pixel including the image sensor, the area of the sub-pixel including the light-emitting element is reduced, and the image sensor is provided in a surplus area by reducing the area. Then, even if a sub-pixel including an image sensor is provided, the same degree of integration as when no image sensor is included can be maintained. Therefore, a high-definition image can be displayed even if an image sensor is provided.

In the display device with a reading function of the present invention, a plurality of pixels are provided over a substrate having an insulating surface, and each of the plurality of pixels emits green light with a first subpixel including a light emitting element that emits red light. A second subpixel including a light emitting element; a third subpixel including a light emitting element that emits blue light; and a fourth subpixel including an imaging element. On the substrate, the area of the first subpixel and the area of the third subpixel are the same, and the area of the area of the second subpixel and the area of the fourth subpixel is the first subpixel. Or the area of the third sub-pixel.

In the display device with a reading function of the present invention, a plurality of pixels are provided over a substrate having an insulating surface, and each of the plurality of pixels emits green light with a first subpixel including a light emitting element that emits red light. A second sub-pixel including a light-emitting element; a third sub-pixel including a light-emitting element that emits blue light; and a fourth sub-pixel including an imaging element. The area obtained by adding the area, the area of the second subpixel, and the area of the fourth subpixel is twice the area of the third subpixel.

Further, the plurality of pixels are arranged in a stripe shape. Further, the plurality of pixels are arranged in a delta shape. Further, the plurality of pixels are arranged in a mosaic pattern.

In the display device with a reading function of the present invention, a plurality of pixels are provided over a substrate having an insulating surface.

Each of the plurality of pixels includes a first subpixel including a first thin film transistor and a light emitting element, and a second subpixel including a second thin film transistor and an imaging element. An insulating layer is provided so as to cover the first thin film transistor, the second thin film transistor, and the imaging element. A light-emitting element and a light-blocking layer are provided over the insulating layer, and the light-blocking layer has an opening at a position overlapping with the imaging element.

Alternatively, each of the plurality of pixels includes a first sub-pixel including a first light-emitting element that emits red light and a second sub-pixel that includes a second light-emitting element that emits green light. Sub-pixels, a third sub-pixel including a third thin-film transistor and a third light-emitting element that emits blue light, and a fourth sub-pixel including a fourth thin-film transistor and an imaging element. An insulating layer is provided so as to cover the first thin film transistor, the second thin film transistor, the third thin film transistor, the fourth thin film transistor, and the imaging element. Over the insulating layer, a light-blocking layer is provided with the first light-emitting element, the second light-emitting element, and the third light-emitting element. The light-shielding layer is characterized in that an opening is provided at a position overlapping the image sensor.

Alternatively, each of the plurality of pixels includes a first sub-pixel including a first light-emitting element that emits red light and a second sub-pixel that includes a second light-emitting element that emits green light. A third subpixel including a third thin film transistor and a third light emitting element emitting blue light, a fourth subpixel including a fourth thin film transistor and a first imaging element, A fifth subpixel including a thin film transistor and a second image sensor; and a sixth subpixel including a sixth thin film transistor and a third image sensor. Cover the first thin film transistor, the second thin film transistor, the third thin film transistor, the fourth thin film transistor, the fifth thin film transistor, the sixth thin film transistor, the first image sensor, the second image sensor, and the third image sensor. In addition, an insulating layer is provided. Over the insulating layer, a light-blocking layer is provided with the first light-emitting element, the second light-emitting element, and the third light-emitting element. The light-shielding layer is provided with an opening at a position overlapping the first image sensor, the second image sensor, and the third image sensor.

Note that a colored layer may be provided over the light-emitting element and the light-blocking layer.

In the display device with a reading function of the present invention, the partition wall layer has a light-shielding property, so that extra light does not enter the image sensor and the information on the reading object can be read accurately.

Further, by changing the area of each sub-pixel, it is possible to improve the variation in emission luminance for each color and to improve the white expression. In addition, since the image sensor is provided in the surplus area by changing the area of each sub-pixel, the same degree of integration as when no image sensor is provided can be maintained. Therefore, a high-definition image can be displayed even if an image sensor is provided.

Note that to improve the expression of white means to improve the phenomenon that white is biased to red or white is biased to blue and to express a color closer to white or white.

Embodiments of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to the following description, and it is easily understood by those skilled in the art that modes and details can be variously changed without departing from the spirit and scope of the present invention. Therefore, the present invention should not be construed as being limited to the description of the embodiments below. Note that in the structures of the present invention described below, the same reference numerals are used in common in different drawings.
(Embodiment 1)

In order to describe the structure of the display device with a reading function of the present invention, a manufacturing process thereof will be described first.

First, the insulating layer 102 serving as a base layer is formed over the substrate 101 having an insulating surface (see FIG. 1A). As the substrate 101, a glass substrate, a quartz substrate, a silicon substrate, or a plastic substrate having heat resistance that can withstand a processing temperature is used.

Next, an amorphous semiconductor layer is formed by a known method (a sputtering method, a plasma CVD method, or the like) so as to be in contact with the insulating layer 102. Next, the amorphous semiconductor layer is crystallized by a known crystallization method (laser crystallization method, thermal crystallization method, thermal crystallization method using a catalyst such as nickel), and the crystalline semiconductor layer 115 is formed. Form.

Next, after patterning the crystalline semiconductor layer 115 to form an island-shaped crystalline semiconductor layer, the thin film transistor 103 is subsequently subjected to a predetermined process such as a thin film forming process, an etching process, or a doping process. 104 and the image sensor 105 are formed (see FIG. 1B). The semiconductor layers included in the thin film transistors 103 and 104 and the imaging element 105 are both crystalline semiconductor layers, and both are provided over the insulating layer 102. In this manner, the semiconductor layer included in the imaging element 105 is the same crystalline semiconductor layer as the thin film transistors 103 and 104, whereby the imaging element 105 can be formed over the substrate 101 without adding a new mask. .

Note that the present invention is not limited to the above structure, and an amorphous semiconductor layer or a microcrystalline semiconductor layer with favorable photoconductivity may be used as a semiconductor layer included in the imaging element 105. In the case where an amorphous semiconductor layer is formed as a semiconductor layer included in the imaging element 105 and a crystalline semiconductor layer is formed as a semiconductor layer included in the thin film transistors 103 and 104, the crystallinity of the semiconductor layer is different in each element. Division is necessary. Therefore, it is necessary to add a new mask.

Note that in order to create semiconductor layers having different crystallinity, a step of selectively irradiating laser light may be used without using a step of adding a new mask.

The thin film transistor 103 includes a crystalline semiconductor layer including an impurity region 109 and a channel formation region 110, a gate insulating layer 111, and conductive layers 112 and 113 functioning as the gate electrode 114. The thin film transistor 103 controls the operation of the image sensor 105. The thin film transistor 104 includes a crystalline semiconductor layer including an impurity region 119 and a channel formation region 120, a gate insulating layer 111, and conductive layers 122 and 123 functioning as the gate electrode 121. The thin film transistor 104 controls operation of a light-emitting element 142 to be formed later. The gate electrodes of the thin film transistors 103 and 104 are formed with a single layer or stacked layers using a conductive material. For example, a laminated structure of tungsten (W) / tungsten nitride (WN, composition ratio of tungsten (W) and nitrogen (N) is not limited), molybdenum (Mo) / aluminum (Al) / Mo, Mo / molybdenum nitride ( A laminated structure of MoN, molybdenum (Mo), and nitrogen (N) is not limited).

The image sensor 105 has a P-type region 106, an I-type region 107, and an N-type region 108. The P-type region 106, the I-type region 107, and the N-type region 108 are provided adjacent to each other in the lateral direction. The imaging element 105 having the P-type region 106, the I-type region 107, and the N-type region 108 is a photovoltaic element that generates an electromotive force due to the optical effect of the semiconductor. However, the imaging element 105 used in the present invention may be not only a photovoltaic element but also a photoelectric conducting element that changes its electrical resistance by light. In the case of a photoconductive element, the imaging element 105 includes a P-type region, an I-type region, and a P-type region, or an N-type region, an I-type region, and an N-type region.

Next, insulating layers 124 to 126 are formed so as to cover the thin film transistors 103 and 104 and the imaging element 105. The insulating layers 124 to 126 are formed using an inorganic material such as silicon oxide or silicon nitride, or an organic material such as polyimide or acrylic. The insulating layers 124 to 126 may be made of a siloxane-based material. For example, a skeleton structure is formed by a bond of silicon and oxygen, and an organic group containing at least hydrogen as a substituent (for example, an alkyl group or an aromatic group). Group hydrocarbons). Further, a fluoro group may be used as a substituent. Further, as a substituent, an organic group containing at least hydrogen and a fluoro group may be used.

Next, openings are provided in the insulating layers 124 to 126, and conductive layers 130 to 135 filling the openings are formed. The conductive layers 130 to 135 function as source / drain wirings (source wiring, drain wiring). The conductive layers 130 to 135 are made of, for example, titanium (Ti) / aluminum silicon (Al—Si, aluminum (Al) to which silicon (Si) is added) / Ti, Mo / Al—Si / Mo, MoN / Al—Si. A stacked structure of / MoN may be employed. Alternatively, a material containing aluminum as a main component and containing nickel or an alloy material containing aluminum as a main component and containing nickel and one or both of carbon and silicon may be used.

Next, the conductive layer 136 is formed so as to be in contact with the conductive layer 134. The conductive layer 136 functions as a pixel electrode of the light emitting element. The conductive layer 136 is formed using light-transmitting indium tin oxide (ITO), ITO to which silicon oxide is added, indium zinc oxide (IZO), zinc oxide (GZO) doped with gallium (Ga), or the like. Use it.

Next, a partition layer 137 is formed so as to cover the conductive layers 130 to 136 (see FIG. 1C). Two openings 138 and 139 are provided in the partition wall layer 137, and one opening 138 is provided at a position overlapping the image sensor 105. Another opening 139 is provided so that the conductive layer 136 is exposed. The partition layer 137 has light shielding properties, and after adding and stirring carbon particles, metal particles, pigments, coloring agents, etc., it is filtered as necessary, and then formed by a spin coating method. . In addition, when adding carbon particles or metal particles to the organic material, a surfactant, a dispersant, or the like may be added so that they are uniformly mixed.

For the partition layer (also referred to as a light-blocking layer) 137, an insulating layer is formed so as to cover the insulating layer 126 and the conductive layers 130 to 136, and then desired portions of the insulating layer are selectively removed. It is a thing. That is, the openings 138 and 139 correspond to portions that are selectively removed in the partition wall layer 137. The partition layer 137 has a step portion.

Next, the electroluminescent layer 140 is formed so as to be in contact with the conductive layer 136 (see FIG. 2). Subsequently, a conductive layer 141 is formed so as to be in contact with the electroluminescent layer 140. The conductive layer 141 functions as a counter electrode. A stacked body of the conductive layer 136, the electroluminescent layer 140, and the conductive layer 141 corresponds to the light-emitting element 142. Next, a counter substrate 143 facing the substrate 101 is provided. Although not illustrated, an optical film such as a circularly polarizing plate may be provided on one surface of the substrate 101 and one surface of the counter substrate 143.

The display device with a reading function of the present invention completed through the above steps has a display function and a reading function. When using the display function, the light emitting element 142 is turned on (light emission) or not lighted (non-light emission) in the direction of the counter substrate 143 to display an image. On the other hand, when the reading function is used, the light emitting element 142 is turned on in the direction of the counter substrate 143, and the light reflected from the reading object 144 enters the image sensor 105, thereby reading information on the reading object 144.

The display device with a reading function of the present invention mainly includes thin film transistors 103 and 104 and an imaging element 105 provided over a substrate 101 having an insulating surface, and insulating layers 124 to 126 covering the thin film transistors 103 and 104 and the imaging element 105. And a light-emitting element 142 provided over the insulating layers 124 to 126 and a partition wall layer 137 that surrounds an end portion of the light-emitting element 142 and has a light-blocking property. The partition wall layer 137 has an opening 138 at a position overlapping the image sensor 105.

In the present invention, a light-blocking material is used as the partition wall layer 137 surrounding the end portion of the light-emitting element, so that light that is not reflected by the reading object 144 is prevented from entering the imaging element 105. In addition, since the partition layer 137 has an opening at a position overlapping with the imaging element 105, the light reflected by the reading object 144 enters the imaging element 105 without being absorbed by the partition layer 137 having a light shielding property. The information of the reading object 144 can be read.

As described above, when the partition wall layer 137 has a light-shielding property, a contour between pixels (a boundary between pixels) becomes clear, so that a high-definition image can be displayed. In addition, since reflection of light entering from the outside is reduced and reflection can be prevented, an optical film such as a polarizing plate becomes unnecessary, and a reduction in size, thickness, and weight are realized.

Note that the direction of light emitted from the light-emitting element 142 is not particularly limited. However, as described above, the light emitted from the light-emitting element 142 is opposed to the barrier layer 137 so as to block light and reduce or eliminate unnecessary light. The case of top emission toward the substrate 143 or dual emission where light emitted from the light emitting element 142 is directed to both the substrate 101 and the counter substrate 143 is effective. In addition, although the effect is less than that of the top emission and the double emission, the bottom emission in which the light emitted from the light emitting element 142 is directed toward the substrate 101 may be used.

When top emission is performed and the thin film transistor 104 for controlling the operation of the light emitting element 142 is N (N channel type), the pixel electrode of the light emitting element 142 is a cathode and the counter electrode is an anode. To be. In addition, when the conductivity type of the thin film transistor is a P type (P channel type), the pixel electrode of the light emitting element 142 is configured as an anode and the counter electrode is a stacked structure of a cathode. At this time, a reflector is provided below the pixel electrode so that light emitted from the light emitting element 142 is directed toward the counter substrate 143. The cross-sectional structure shown in FIG. 2 employs the above structure, and a conductive layer 134 that serves as a reflector is provided below a conductive layer 136 that functions as a pixel electrode of the light-emitting element 142.

In the case of performing dual emission, both the pixel electrode and the counter electrode of the light-emitting element 142 are formed using a light-transmitting material or a thickness that transmits light.

When bottom emission is performed and the conductivity type of the thin film transistor 104 is N-type, the pixel electrode of the light-emitting element 142 has a cathode and the counter electrode is reversely stacked. At this time, a reflector is provided on the counter electrode so that light emitted from the light emitting element 142 is directed to the substrate 101 side. In the case where the conductivity type of the thin film transistor 104 is P-type, the pixel electrode of the light-emitting element 142 is structured as an anode and the counter electrode is stacked in order.

Further, the display device with a reading function of the present invention is not limited to a form using a light emitting element that emits one of red, green, and blue, and a white light emitting element and a colored layer, or a blue light emitting element and a color conversion layer. May be used. Therefore, a cross-sectional structure of a display device with a reading function when a white light emitting element and a colored layer are used will be described with reference to the drawings.

Imaging elements 151 to 153 and thin film transistors 154 to 156 are provided over the substrate 101, and insulating layers 124 to 126 are provided so as to cover the imaging elements 151 to 153 and the thin film transistors 154 to 156 (see FIG. 3). White light emitting elements 157 to 159 are provided over the insulating layers 124 to 126, and a partition layer 137 surrounding the ends of the white light emitting elements 157 to 159 is provided. The partition layer 137 has openings 164 to 166 at positions overlapping with the imaging elements 151 to 153.

A counter substrate 143 including the colored layers 161 to 163 is provided so as to face the substrate 101. Of the colored layers 161 to 163, one corresponds to red, one corresponds to green, and one corresponds to blue. The white light emitting elements 157 to 159 emit light of any one color of red, green, and blue through any of the colored layers 161 to 163.

In the case of using a blue light emitting element and a color conversion layer, the white light emitting elements 157 to 159 may be blue light emitting elements and the colored layers 161 to 163 may be color conversion layers.

In the above configuration, the light emitted from each of the white light emitting elements 157 to 159 passes through each of the colored layers 161 to 163 and reaches the surface of the reading object 144. Then, each of the image sensors 151 to 153 receives the light reflected on the surface of the reading object 144, whereby the information on the reading object 144 can be read.

When a colored layer or a color conversion layer that transmits light in a certain wavelength band is provided on the light emitting side of the light emitting element as in the above configuration, the color purity is improved and the pixel portion is mirrored (reflected). ) Can be prevented. In addition, when a colored layer or a color conversion layer is provided, it is possible to omit a circularly polarizing plate that has been conventionally required, and it is possible to eliminate a loss of light emitted from the electroluminescent layer. Furthermore, a change in color tone that occurs when the pixel region is viewed obliquely can be reduced. In addition, when a white light emitting element or a blue light emitting element is used, it is not necessary to coat the electroluminescent layer separately, so that the process can be shortened to realize cost reduction.

Next, the configuration of the display device with a reading function of the present invention having the cross-sectional structure shown in FIGS. 1 to 3 will be described with reference to the drawings.

In the display device with a reading function of the present invention, a source driver 202, a gate driver 203, a sensor source driver 204, a sensor gate driver 205, and a plurality of pixels 206 are provided in a matrix on a substrate 101 having an insulating surface. And a pixel region 207 (see FIG. 4A). The pixel 206 includes a plurality of subpixels, and includes at least one subpixel including a light emitting element and one subpixel including an imaging element. The source driver 202 and the gate driver 203 control the operation of the subpixel including the light emitting element, and the sensor source driver 204 and the sensor gate driver 205 control the operation of the subpixel including the imaging element.

Although various configurations are applied to the pixel 206, for example, a first subpixel 211 including a first light emitting element that emits red light and a second subpixel including a second light emitting element that emits green light. In some cases, the pixel 212 includes a third sub-pixel 213 including a third light-emitting element that emits blue light, and a fourth sub-pixel 214 including an imaging element (see FIG. 4B). Each of the first subpixel 211 to the fourth subpixel 214 includes a thin film transistor that controls the light emitting element or the imaging element.

In the case of the above configuration, the subpixel to be turned on is switched, and the image is read each time. Thereafter, by combining the read information, the color information of the reading object can be obtained. Specifically, for example, the first subpixel 211 is turned on, the information on the reading object is read by the fourth subpixel 214, and then the second subpixel 212 is turned on, The information of the reading object is read by the sub-pixel 214. Finally, the third sub-pixel 213 is turned on, and the information of the reading object is read by the fourth sub-pixel 214. Thereafter, if the three pieces of read information are combined, the color information of the reading object can be obtained. In the case of this configuration, the color information of the reading object can be obtained by reading three times.

As another configuration of the pixel 206, a first sub-pixel 211 including a first light-emitting element that emits red light, a second sub-pixel 212 including a second light-emitting element that emits green light, and blue A third sub-pixel 213 including a third light-emitting element that emits light; a fourth sub-pixel 214 including a first imaging element; a fifth sub-pixel 215 including a second imaging element; In some cases, the pixel includes a sixth sub-pixel 216 including an imaging element (see FIG. 4C). Each of the first subpixel 211 to the sixth subpixel 216 includes a thin film transistor that controls the light emitting element or the imaging element.

In addition, the first subpixel 211 and the fourth subpixel 214, the second subpixel 212 and the fifth subpixel 215, and the third subpixel 213 and the sixth subpixel 216 are adjacent to each other. Provided. In addition, the area obtained by adding the first subpixel 211 and the fourth subpixel 214, the area obtained by adding the second subpixel 212 and the fifth subpixel 215, the third subpixel 213, and the The area obtained by adding the six sub-pixels 216 is the same or substantially the same.

In the case of the above configuration, the first subpixel 211 to the third subpixel 213 are turned on at the same time, and the information on the reading object is read by the subpixels of the fourth subpixel 214 to the sixth subpixel 216. The fourth subpixel 214 receives the reflected light of the light emitted from the first subpixel 211, the fifth subpixel 215 receives the reflected light of the light emitted from the second subpixel 212, and the sixth subpixel 214 receives the reflected light of the light emitted from the second subpixel 212. The pixel 216 receives the reflected light of the light emitted from the third subpixel 213. In the case of this configuration, the color information of the reading object can be obtained by one reading. Note that the reflected light described here is light reflected from the surface of the object to be read by light emitted from the light emitting element.

As another structure of the pixel 206, the pixel 206 may include a first subpixel 211 to a third subpixel 213 including a light-emitting element and subpixels 226 and 227 including an imaging element (FIG. 5A). reference). The subpixels 226 and 227 receive the reflected light of the first subpixel 211 to the third subpixel 213. In this configuration, the color information of the reading object can be obtained by reading three times.

As another structure of the pixel 206, the pixel 206 may include first to third subpixels 211 to 213 including a light-emitting element and subpixels 220 to 225 including an imaging element (FIG. 5B). reference). The subpixels 220 and 223 receive the reflected light of the first subpixel 211, the subpixels 221 and 224 receive the reflected light of the second subpixel 212, and the subpixels 222 and 225 receive the third subpixel 213. Receive reflected light. In this configuration, it is possible to obtain color information of a reading object by one reading.

As another structure of the pixel 206, the pixel 206 may include a first sub-pixel 211 to a third sub-pixel 213 including a light-emitting element and sub-pixels 230 to 241 including an imaging element (FIG. 5C). reference). The subpixels 230, 231, 236 and 237 receive the reflected light of the first subpixel 211, and the subpixels 232, 233, 238 and 239 receive the reflected light of the second subpixel 212, and the subpixels 234, 235, 240 and 241 receive the reflected light of the third subpixel 213. Even in this configuration, it is possible to obtain color information of an object to be read in one reading.

Further, although the shape of the pixel 206 described above is a rectangular shape, the present invention is not limited to this shape, and may be a polygonal shape such as a hexagonal shape (see FIG. 5D) or a circular shape. Good.

In the above description, the case where the first sub-pixel 211 to the third sub-pixel 213 have a light emitting element that emits one of red, green, and blue is described. Not constrained. For example, the first subpixel 211 may have a light emitting element that emits white light and a red colored layer, or a light emitting element that emits blue light and a color conversion layer, as long as the light emitted to the outside is red. It only has to be. The second sub-pixel 212 only needs to have a white light-emitting element and a green colored layer, or a blue light-emitting element and a color conversion layer, as long as the light emitted to the outside is green. The third sub-pixel 213 only needs to have a white light-emitting element and a blue colored layer, or a blue light-emitting element and a color conversion layer, as long as light emitted to the outside is blue.
(Embodiment 2)

As described above, the pixel 206 included in the display device with a reading function of the present invention includes a plurality of subpixels, and includes one subpixel including at least a light emitting element and one subpixel including an imaging element. . In the following, the structure of a display device with a reading function, in which the area of a subpixel provided on a substrate is changed, will be described.

First, the first configuration will be described with reference to the drawings. The pixel 206 includes a first subpixel 211 including a light emitting element that emits red light, a second subpixel 212 including a light emitting element that emits green light, and a third subpixel 213 including a light emitting element that emits blue light. And a fourth sub-pixel 214 including an imaging element (see FIGS. 6A to 6E). On the substrate, the area of the first subpixel 211 and the area of the third subpixel 213 are the same or substantially the same, and the area of the area of the second subpixel 212 and the area of the fourth subpixel 214 is added. Is the same as or approximately the same as the area of the first subpixel 211 or the area of the third subpixel 213.

The area ratio between the area of the second subpixel 212 and the area of the fourth subpixel 214 is, for example, the area of the second subpixel 212: the area of the fourth subpixel 214 = 3: 1. Alternatively, the area of the second sub-pixel 212: the area of the fourth sub-pixel 214 = 5: 1 may be set (see FIG. 6). (See (D) and (E)). This area ratio may be determined according to the current density of the red, green, and blue light emitting materials, and may be an area ratio that improves the variation in luminance of each color. Further, the area of the second subpixel 212 and the area of the fourth subpixel 214 may be divided horizontally (see FIGS. 6A to 6C) or may be divided vertically. Further, the first subpixel 211 to the fourth subpixel 214 included in the pixel 206 are arranged in a stripe arrangement in which subpixels corresponding to red, green, and blue are arranged in a stripe pattern (FIGS. 6A and 6D). Reference) Delta arrangement shifted by half pitch for each line (see FIGS. 6B and 6E), Mosaic arrangement in which sub-pixels corresponding to red, green and blue are arranged obliquely (see FIG. 6C) Any of these arrangement methods may be adopted. Since the stripe arrangement is suitable for displaying lines, figures, characters, and the like, it is preferably applied to a monitor. The mosaic arrangement is preferably applied to a television set or the like because a more natural image can be obtained than the stripe arrangement. In addition, since the delta arrangement can provide a natural image display, it is preferably applied to a television apparatus or the like.

Next, the second configuration will be described with reference to the drawings. The pixel 206 includes a first subpixel 211 including a light emitting element that emits red light, a second subpixel 212 including a light emitting element that emits green light, and a third subpixel 213 including a light emitting element that emits blue light. And a fourth sub-pixel 214 including an imaging element (see FIGS. 7A to 7E). Then, the area obtained by adding the area of the first subpixel 211, the area of the second subpixel 212, and the area of the fourth subpixel 214 on the substrate 101 is 2 of the area of the third subpixel 213. Double or approximately double.

The area ratio of the area of the first subpixel 211, the area of the second subpixel 212, and the area of the fourth subpixel 214 is, for example, the area of the first subpixel 211: the second subpixel. The area of the pixel 212: the area of the fourth subpixel 214 may be 1: 1: 1 (see FIGS. 7A to 7C), or the area of the first subpixel 211: the second subpixel. The area of the pixel 212: The area of the fourth sub-pixel 214 may be set to 5: 4: 3 (see FIGS. 7D and 7E). This area ratio may be determined according to the current density of the red, green, and blue light emitting materials, and may be an area ratio that improves the variation in luminance of each color. The first subpixel 211 to the fourth subpixel 214 are arranged in a stripe arrangement (see FIGS. 7A and 7D), a delta arrangement (see FIGS. 7B and 7E), and a mosaic arrangement (see FIGS. Any arrangement method shown in FIG. 7C may be adopted.

Note that as described above, the area ratio of the first subpixel 211, the second subpixel 212, the third subpixel 213, and the fourth subpixel 214 is equal to the current density of the red, green, and blue light emitting materials. It may be determined accordingly. For example, the area obtained by adding the area of one subpixel selected from the first subpixel 211, the second subpixel 212, and the third subpixel 213 to the area of the fourth subpixel 214 is the first subpixel 211. The area of the remaining two subpixels selected from the subpixel 211, the second subpixel 212, and the third subpixel 213 may be 0.5 times. The area obtained by adding the area of two subpixels selected from the first subpixel 211, the second subpixel 212, and the third subpixel 213 and the area of the fourth subpixel 214 is the first subpixel 211. The area of the remaining one subpixel selected from the subpixel 211, the second subpixel 212, and the third subpixel 213 may be doubled.

The pixel 206 included in the display device with a reading function of the present invention includes a plurality of subpixels, and includes one subpixel including at least a light emitting element and one subpixel including an imaging element. Here, an example of an equivalent circuit of the pixel 206 will be described with reference to the drawings.

First, the pixel 206 includes a first sub-pixel 211 including a first light-emitting element that emits red light, a second sub-pixel 212 including a second light-emitting element that emits green light, and a third sub-pixel that emits blue light. An equivalent circuit diagram in the case of including the third subpixel 213 including the light emitting element and the fourth subpixel 214 including the imaging element will be described (see FIG. 8).

Each of the first sub-pixel 211 to the third sub-pixel 213 has a switch area in a region surrounded by the source line Sx (x is a natural number), the power supply line Vx, and the gate line Gy (y is a natural number). The transistor 250, the driving transistor 251, the capacitor 252, and the light-emitting element 253 are included. The switching transistor 250 is a transistor that controls the input of a video signal to the sub-pixel, and the conductivity type may be either N-type or P-type. The driving transistor 251 is a transistor that controls the value of a current flowing through the light emitting element 253, and the conductivity type may be either N-type or P-type. The capacitor 252 plays a role of holding a video signal input to the sub-pixel. In the configuration shown in the figure, the conductivity type of the switching transistor 250 is N-type, and the conductivity type of the driving transistor 251 is P-type.

The fourth subpixel 214 includes a selection transistor 254 in a region surrounded by the source line Sam (m is a natural number), the reset line Rn (n is a natural number), the power supply line Vam, and the gate line Gan. The pixel includes an amplifying transistor 255, a resetting transistor 256, and an image sensor 257. The reset transistor 256 is a transistor that resets the potential difference between one region and the other region of the image sensor 257. The amplification transistor 255 is a transistor that amplifies a signal read from the image sensor 257. The selection transistor 254 controls the supply of the signal read by the image sensor 257 to the sensor source driver. In the illustrated configuration, the conductivity type of the selection transistor 254 and the amplification transistor 255 is P-type, and the conductivity type of the reset transistor 256 is N-type.

Next, a first sub-pixel 211 including a first light-emitting element that emits red light, a second sub-pixel 212 including a second light-emitting element that emits green light, and a third light-emitting element that emits blue light A third sub-pixel 213 including the fourth sub-pixel 214 including the first image sensor, a fifth sub-pixel 215 including the second image sensor, and a sixth sub-pixel including the third image sensor. An equivalent circuit diagram in the case of including the sub-pixel 216 will be described (see FIG. 9).

Also in this case, similarly to the pixel configuration described above, the first subpixel 211 to the third subpixel 213 include a switching transistor 250, a driving transistor 251, a capacitor element 252, and a light emitting element 253. The fourth subpixel 214 to the sixth subpixel 216 include a selection transistor 254, an amplification transistor 255, a reset transistor 256, and an imaging element 257. This embodiment can be freely combined with the above embodiment modes.

In this embodiment, a structure of a panel which is an embodiment of the display device with a reading function of the present invention will be described with reference to the drawings. The panel includes a source driver 202, a gate driver 203, a sensor source driver 204, a sensor gate driver 205, a pixel region 207 in which a plurality of pixels are provided in a matrix, a connection film 401, a substrate 101 having an insulating surface. The counter substrate 143 is opposed to the substrate 101 (see FIG. 10A). The connection film 401 is connected to an external IC chip.

FIG. 10B is a cross-sectional view taken along the line AB of the panel, and shows an imaging element 405, a light emitting element 406, a driving transistor 407 provided in the pixel region 207, and a CMOS element 404 provided in the source driver 202. . Note that in FIG. 10B, description of a cross-sectional structure of an element provided in the sensor source driver 204 is omitted.

A sealing material 403 is provided around the pixel region 207 and the above four drivers, and the substrate 101 and the counter substrate 143 are bonded together by the sealing material 403. Such treatment is treatment for protecting the light-emitting element 406 from moisture. Here, a method of sealing with a cover material (glass, ceramics, plastic, metal, or the like) is used, but a thermosetting resin or ultraviolet light is used. A method of sealing with a curable resin or a method of sealing with a thin film having a high barrier ability such as a metal oxide or a nitride may be used.

Here, since the element formed over the substrate 101 is formed using a crystalline semiconductor (polysilicon) having favorable characteristics such as mobility as compared with an amorphous semiconductor, monolithic formation is realized. . Accordingly, the number of external ICs to be connected is reduced, and a small size, light weight, and thin shape can be realized.

The display device with a reading function of the present invention can be provided with a touch panel function. This is done by reflecting light at the pen tip of the input pen 402. That is, in this function, the light emitted from the light emitting element 406 is reflected at the pen tip of the input pen 402, and the reflected light enters the image sensor 405, whereby the position indicated by the input pen 402 is recognized.

As a conventional device provided with a touch panel function, there is a device using a resistance film, but this method requires a resistance film on the surface of the display screen. Then, since the user views the image through the resistance film, the brightness of the image may be impaired. In addition, as it is used, it may be deformed and destroyed, and there is a problem in durability. Moreover, even if it does not lead to destruction, a problem may occur in detection accuracy of pen input due to deformation. However, when the display device with a reading function of the present invention is provided with a touch panel function, a clear image can be displayed without impairing the luminance of the displayed image. Moreover, it is excellent in durability and can maintain a state with good detection accuracy. This embodiment can be freely combined with the above embodiment modes and embodiments.

In this embodiment, an electronic device including a display device with a reading function according to the present invention will be described with reference to the drawings. As electronic devices having a pixel region including a light-emitting element, a television device (also simply referred to as a television or a television receiver), a digital camera, a digital video camera, a mobile phone device (also simply referred to as a mobile phone or a mobile phone), or a PDA Mobile information terminals such as personal computer, portable game machines, computer monitors, sound reproduction devices such as car audio, and home game machines. A specific example will be described with reference to FIG.

The cellular phone includes a display portion 9102 with a reading function and the like (see FIG. 11A). As the display portion with reading function 9102, the display portion described in Embodiment Modes 1 and 2 can be applied.

The portable information terminal includes a display portion 9301 with a reading function, an input pen 9302, and the like (see FIG. 11B). As the display portion with reading function 9301, the display portion described in Embodiment Modes 1 and 2 can be applied.

The digital video camera includes display portions 9701 and 9702 with a reading function (see FIG. 11C). As the display portions 9701 and 9702 with a reading function, those described in Embodiment Modes 1 and 2 can be applied.

The portable game machine includes a display portion 9402 with a reading function (see FIG. 11D). As the display portion with reading function 9402, the display portion described in Embodiment Modes 1 and 2 can be applied.

The portable information terminal includes a display portion 9202 with a reading function and the like (see FIG. 11E). As the display portion 9202 with a reading function, the one described in Embodiment Modes 1 and 2 can be applied.

The monitor device includes a display portion 9502 with a reading function, an input pen 9503, and the like (see FIG. 11F). As the display portion with reading function 9502, one shown in Embodiment Modes 1 and 2 can be applied.

By applying the display device with a reading function of the present invention, not only a display function but also a reading function can be provided, so that an electronic device with high functionality and high added value can be provided. In addition, by providing an input pen, a touch panel function can be added, and an electronic device that realizes further higher functionality and higher added value can be provided.

The display device with a reading function of the present invention has two functions of a display function and a reading function. In this embodiment, a switching system for both functions will be described with reference to the drawings.

First, the display device with a reading function of the present invention is turned on and started (see FIG. 12A). After startup, the display mode is automatically entered first, the display unit is turned on, and the sensor unit is turned off. The display portion described here corresponds to a subpixel including a light emitting element and a driver that controls the subpixel. The sensor unit corresponds to a subpixel including an image sensor and a driver that controls the subpixel.

Subsequently, when the display mode is changed to the reading mode, the buttons and the input pen provided on the display device are used. In the reading mode, both the display unit and the sensor unit are turned on. Further, when the mode is changed from the reading mode to the display mode, it is performed by using a button or an input pen provided on the display device.

The display device with a reading function of the present invention is most suitable for a portable terminal such as a PDA or a mobile phone. For example, if a business card is placed on the display screen after entering the reading mode, the image is quickly read (FIG. 12B). After that, after changing from the reading mode to the display mode, the read image can be displayed on the same display screen (see FIG. 12C).

Further, not only business cards but also human body biometric information such as fingerprints can be read as an object to be read. If biometric information can be read, an authentication function can be performed. For example, first, a finger is brought into close contact with the screen of the portable terminal to read fingerprint information (see a top view in FIG. 13A and a cross-sectional view in FIG. 13B). Specifically, the fingerprint information is information on the end points and branch points of the fingerprint (see FIG. 13C). When reading of the fingerprint end point and branch point information is completed, the information is compared with the fingerprint information stored in the database in advance (see FIG. 13D). Alternatively, the fingerprint information in the database is specified by inputting the ID number at the same time, and collated with the specified fingerprint information. By using such a personal authentication function, it is possible to prevent others from using their mobile terminals or to conduct electronic commerce using the mobile terminals.

4A and 4B illustrate a structure of a display device with a reading function according to the invention. 4A and 4B illustrate a structure of a display device with a reading function according to the invention. 4A and 4B illustrate a structure of a display device with a reading function according to the invention. 4A and 4B illustrate a structure of a display device with a reading function according to the invention. 4A and 4B illustrate a structure of a display device with a reading function according to the invention. 4A and 4B illustrate a structure of a display device with a reading function according to the invention. 4A and 4B illustrate a structure of a display device with a reading function according to the invention. 4A and 4B illustrate a structure of a display device with a reading function according to the invention. 4A and 4B illustrate a structure of a display device with a reading function according to the invention. The figure explaining a panel. 6A and 6B illustrate electronic devices. The figure explaining the usage pattern of the display apparatus with a reading function of this invention. The figure explaining the usage pattern of the display apparatus with a reading function of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Substrate 102 Insulating layer 103 Thin film transistor 104 Thin film transistor 105 Image sensor 106 P-type region 107 I-type region 108 N-type region 109 Impurity region 110 Channel formation region 111 Gate insulating layer 112 Conductive layer 113 Conductive layer 114 Gate electrode 115 Crystalline semiconductor layer 119 Impurity region 120 Channel formation region 121 Gate electrode 122, 123 Conductive layer 124-126 Insulating layer 130-136 Conductive layer 137 Partition layer 138, 139 Opening 140 Electroluminescent layer 141 Conductive layer 142 Light emitting element 143 Counter substrate 144 Reading object 151 153 Imaging elements 154 to 156 Thin film transistors 157 to 159 White light emitting elements 161 to 163 Colored layers 164 to 166 Openings

Claims (7)

  1. Having a plurality of pixels on a substrate having an insulating surface;
    Each of the plurality of pixels is
    A thin film transistor;
    An image sensor;
    An insulating layer provided on the thin film transistor and the imaging device;
    A first conductive layer provided on the insulating layer;
    A light-shielding layer provided on the insulating layer;
    A light emitting layer provided on the first conductive layer and the light-shielding layer;
    A second conductive layer provided on the light emitting layer,
    The thin film transistor is electrically connected to the image sensor,
    The light-shielding layer is provided so as to cover an end portion of the first conductive layer and the thin film transistor,
    The display device with a reading function, wherein the light-shielding layer has an opening provided at a position overlapping with the imaging element.
  2. Having a plurality of pixels on a substrate having an insulating surface;
    Each of the plurality of pixels is
    A first thin film transistor;
    A second thin film transistor;
    An image sensor;
    An insulating layer provided on the first thin film transistor, the second thin film transistor, and the imaging element;
    A first conductive layer provided on the insulating layer;
    A light-shielding layer provided on the insulating layer;
    A light emitting layer provided on the first conductive layer and the light-shielding layer;
    A second conductive layer provided on the light emitting layer,
    The light-shielding layer is provided so as to cover an end portion of the first conductive layer, the first thin film transistor, and the second thin film transistor,
    The light-shielding layer has an opening provided at a position overlapping the image sensor,
    The first thin film transistor has a function of controlling an operation of a light emitting element having the first conductive layer, the light emitting layer, and the second conductive layer,
    The display device with a reading function, wherein the second thin film transistor has a function of controlling the imaging element.
  3. In claim 2,
    A display device with a reading function, comprising a colored layer on the light-emitting element and the light-shielding layer.
  4. In claim 2 or claim 3 ,
    A conductive layer electrically connected to the first thin film transistor and functioning as a source wiring or a drain wiring;
    The display device with a reading function, wherein the conductive layer functioning as the source wiring or the drain wiring has a function as a reflector.
  5. In any one of Claims 2 thru | or 4,
    The semiconductor layer in which the image pickup element has a first semiconductor layer having said first thin film transistor, and a second semiconductor layer having said second thin film transistor is characterized in that is provided with the same material Display device with reading function.
  6. In any one of Claims 1 thru | or 5 ,
    The display device with a reading function, wherein the substrate is a plastic substrate.
  7. An electronic apparatus using the display device with a reading function according to any one of claims 1 to 6 .
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