TW202125800A - Display and method for manufacturing display - Google Patents

Abstract

To appropriately make a display usable even when a defect occurs. A display comprises: a plurality of inorganic luminous bodies 100 arranged in matrix; and an opposing electrode connected to the plurality of inorganic luminous bodies 100. The plurality of inorganic luminous bodies 100 includes a single-color inorganic luminous body 100A that can emit light in a predetermined wavelength range, and an auxiliary inorganic luminous body 100B comprising a first auxiliary inorganic light emitting device 102RB that can emit light in a first wavelength range when supplied with current, a second auxiliary inorganic light emitting device 102GB that can emit light in a second wavelength range when supplied with current, and an electrode connected to the first auxiliary inorganic light emitting device 102RB and the second auxiliary inorganic light emitting device 102GB. The opposing electrode is connected to the single-color inorganic luminous body 100A and the first auxiliary inorganic light emitting device 102RB, and is not connected to the second auxiliary inorganic light emitting device 102GB.

Description

Display device and manufacturing method of display device

The present invention relates to a display device and a manufacturing method of the display device.

In recent years, as a display element, a display device using a micro-sized light-emitting diode (micro LED) has attracted attention (for example, refer to Patent Document 1). A plurality of light-emitting diodes are connected to an array substrate (driver backplane in Patent Document 1), and the array substrate is provided with a pixel circuit for driving the light-emitting diodes (electronic control circuit in Patent Document 1). [Prior Technical Literature] [Patent Literature]

[Patent Document 1] JP 2017-529557 Publication

[The problem to be solved by the invention]

However, for display devices using light-emitting diodes, it is difficult to mount the light-emitting diodes on the substrate due to the small size of the light-emitting diodes and other reasons, and it is easy to cause defects of the light-emitting diodes. In the case where the defective display device is discarded and not used, the yield is reduced. Therefore, in a display device using a light-emitting diode, it is desired that it can be suitably used even if a defect occurs during manufacturing.

The present invention was completed in view of the above-mentioned problems, and its object is to provide a display device and a manufacturing method of the display device that can be suitably used even in the case of failure during manufacturing. [Technical means to solve the problem]

A display device of one aspect of the present invention includes a plurality of phosphors arranged in a matrix, and a counter electrode connected to the plurality of phosphors, and the plurality of phosphors includes: a monochromatic phosphor, which Can emit light in a specific wavelength band; and an auxiliary inorganic light-emitting body, which has: a first auxiliary inorganic light-emitting element that can emit light in the first wavelength band when current is supplied, and a first auxiliary inorganic light-emitting element that can emit light in the first wavelength band when current is supplied A second auxiliary inorganic light-emitting element for light of 2 wavelength bands, and an electrode connected to the first auxiliary inorganic light-emitting element and the second auxiliary inorganic light-emitting element; and the counter electrode is connected to the monochromatic phosphor and the first auxiliary The inorganic light-emitting element is not connected to the aforementioned second auxiliary inorganic light-emitting element.

A method of manufacturing a display device according to one aspect of the present invention includes: a step of forming a monochromatic phosphor, which forms a monochromatic phosphor that can emit light in a specific wavelength band; and a step of forming an auxiliary phosphor, which forms an auxiliary phosphor The auxiliary inorganic light-emitting body is provided with: a first auxiliary inorganic light-emitting element that can emit light in the first wavelength band when current is supplied, and a second auxiliary inorganic light-emitting element that can emit light in the second wavelength band when current is supplied. Auxiliary inorganic light-emitting element, and an electrode connected to the first auxiliary inorganic light-emitting element and the second auxiliary inorganic light-emitting element; and a counter electrode forming step, which forms a counter electrode, and the counter electrode is connected to the monochromatic inorganic luminescence The body and the first auxiliary inorganic light-emitting element are not connected to the second auxiliary inorganic light-emitting element.

Hereinafter, each embodiment of the present invention will be described with reference to the drawings. In addition, the disclosure is only an example at the end, and suitable changes that can be easily imagined by those skilled in the art to maintain the gist of the invention are of course included in the scope of the present invention. In addition, in order to make the description more clear, there are cases in which the width, thickness, shape, etc. of each part are shown schematically in comparison with the actual state of the drawings. By. In addition, in this specification and the drawings, there are cases where the same elements as those described in the already-appearing drawings are given the same symbols, and detailed descriptions are omitted as appropriate.

(First Embodiment) (Constitution of display device) Fig. 1 is a plan view showing a configuration example of the display device of the first embodiment. As shown in FIG. 1, the display device 1 of the first embodiment includes an array substrate 2, a pixel Pix, a driving circuit 12, a driving IC (Integrated Circuit) 210, and a cathode wiring 60. The array substrate 2 is a driving circuit substrate for driving each pixel Pix, and is also called a backplane or an active matrix substrate. The array substrate 2 has a substrate 10, a plurality of transistors, a plurality of capacitors, various wirings, and the like.

As shown in FIG. 1, the display device 1 has a display area AA and a peripheral area GA. The display area AA is an area for the arrangement of a plurality of pixels Pix, and is an area for displaying images. The peripheral area GA is an area that does not overlap with a plurality of pixels Pix, and is arranged outside the display area AA.

The plurality of pixels Pix are arranged in the first direction Dx and the second direction Dy in the display area AA of the substrate 10. In addition, the first direction Dx and the second direction Dy are directions parallel to the first surface 10a (see FIG. 5) of the substrate 10 of the array substrate 2. The first direction Dx is orthogonal to the second direction Dy. However, the first direction Dx may cross the second direction Dy instead of being orthogonal. The third direction Dz is a direction orthogonal to the first direction Dx and the second direction Dy. The third direction Dz corresponds to, for example, the normal direction of the substrate 10. In addition, in the following, the top view shows the positional relationship when viewed from the third direction Dz.

The driving circuit 12 is disposed in the peripheral area GA of the substrate 10. The driving circuit 12 drives a plurality of gate lines based on various control signals from the driving IC 210 (for example, the light emission control scan line BG, the reset control scan line RG, the initialization control scan line IG, and the write control scan line SG (refer to FIG. 3)) The circuit. The driving circuit 12 selects a plurality of gate lines sequentially or simultaneously, and supplies gate driving signals to the selected gate lines. Thereby, the driving circuit 12 selects a plurality of pixels Pix connected to the gate line.

The driving IC 210 is a circuit that controls the display of the display device 1. The driving IC 210 can be mounted on the peripheral area GA of the substrate 10 with COG (Chip On Glass). It is not limited to this, and the driver IC 210 can be mounted on a wiring substrate connected to the peripheral area GA of the substrate 10 by COF (Chip On Film). In addition, the wiring board connected to the board 10 is, for example, a flexible printed board or a rigid board.

The cathode wiring 60 is provided in the peripheral area GA of the substrate 10. The cathode wiring 60 is provided to surround the plurality of pixels Pix in the display area AA and the driving circuit 12 in the peripheral area GA. The cathodes (cathode electrodes 114 (see FIG. 4)) of the plurality of inorganic light emitters 100 (see FIG. 4) are connected to the common cathode wiring 60, and are supplied with a fixed potential (for example, ground potential). More specifically, the cathode electrode 114 of the inorganic light-emitting body 100 is connected to the cathode wiring 60 via the opposite cathode electrode 90 e on the array substrate 2. In addition, it is feasible that the cathode wiring 14 has a slot in a part, and is formed by two different wirings on the substrate 10.

Fig. 2 is a plan view showing a plurality of pixels in the first embodiment. As shown in FIG. 2, one pixel Pix includes a plurality of pixels 49. The pixels 49 each have an inorganic light-emitting body 100 provided with an inorganic light-emitting element 102. The phosphor 100 is an inorganic light-emitting diode (LED: Light Emitting Diodee) chip with a size of several μm or more and 300 μm or less when viewed from above. Generally speaking, a chip with a size of 100 μm or more is called a mini LED. (mini LED), the size of less than 100 μm ~ several μm is called micro LED (micro LED). In the present invention, LEDs of any size can be used as long as they are used separately according to the screen size (the size of one pixel) of the display device. A display device equipped with a micro LED (micro LED) in each pixel is also called a micro LED display device. In addition, the miniature size of the micro LED does not limit the size of the phosphor 100. The structure of the inorganic light-emitting body 100 and the inorganic light-emitting element 102 will be described later.

The display device 1 of this embodiment has a pixel PixA and a pixel PixB as the pixel Pix. For example, the pixel PixA has a first pixel 49R, a second pixel 49G, and a third pixel 49B. The first pixel 49R is a pixel that emits light in the first wavelength band. In this embodiment, since the light of the first wavelength band is light of red which is the primary color of the first color, the first pixel 49R displays red which is the primary color of the first color. The second pixel 49G is a pixel that emits light in a second wavelength band different from the first wavelength band. In this embodiment, since the light of the second wavelength band is light of green which is the primary color of the second color, the second pixel 49G displays green which is the primary color of the second color. The third pixel 49B is a pixel that emits light in a third wavelength band different from the first wavelength band and the second wavelength band. In this embodiment, since the light of the third wavelength band is light of blue which is the primary color of the third color, the third pixel 49B displays blue which is the primary color of the third color. In addition, each of the first color, the second color, and the third color is not limited to red, green, and blue, and arbitrary colors such as complementary colors can be selected. That is, the first wavelength band, the second wavelength band, and the third wavelength band are not limited to correspond to red, green, and blue, respectively. Furthermore, as shown in FIG. 2, in one pixel PixA, the first pixel 49R and the third pixel 49B are arranged in the first direction Dx. In addition, the second pixel 49G and the third pixel 49B are arranged in the second direction Dy. Hereinafter, the first pixel 49R, the second pixel 49G, the third pixel 49B, and the auxiliary pixel 49BB, which will be described later, are referred to as the pixel 49 without distinction. In addition, the number of pixels 49 included in one pixel PixA is not limited to three, and a corresponding relationship can be established with four or more pixels 49. For example, it may include a fourth pixel 49W corresponding to white as the fourth color. In addition, the arrangement of the plurality of pixels 49 is not limited to the configuration shown in FIG. 2. For example, the first pixel 49R may be adjacent to the second pixel 49G in the first direction Dx. In addition, the first pixel 49R, the second pixel 49G, and the third pixel 49B may be sequentially and repeatedly arranged in the first direction Dx.

The first pixel 49R has a first monochromatic phosphor 100RA that emits light in the first wavelength band, as the phosphor 100, and the second pixel 49G has a second monochromatic phosphor 100GA that emits light in the second wavelength band, As the phosphor 100, the third pixel 49B has a third monochromatic phosphor 100BA that emits light in the third wavelength band, as the phosphor 100. The first single-color phosphor 100RA includes the first single-color phosphor 102RA as the inorganic light-emitting element 102, and the second single-color phosphor 100GA includes the second single-color phosphor 102GA as the inorganic light-emitting element 102, and the third The monochromatic phosphor 100BA includes the third monochromatic inorganic light emitting element 102BA as the inorganic light emitting element 102. The first single-color phosphor 100RA (the first single-color phosphor 102RA), the second single-color phosphor 100GA (the second single-color phosphor 102GA), and the third single-color phosphor 100BA (the third The monochromatic inorganic light-emitting element 102BA) can be described as an inorganic light-emitting body 100 (inorganic light-emitting element 102) that emits light of a single color and different colors. Hereinafter, the first monochromatic phosphor 100RA, the second monochromatic phosphor 100GA, and the third monochromatic phosphor 100BA will be referred to as the monochromatic phosphor 100A without distinction. Similarly, the first single-color inorganic light-emitting element 102RA, the second single-color inorganic light-emitting element 102GA, and the third single-color inorganic light-emitting element 102BA are referred to as the single-color inorganic light-emitting element 102A without distinction. The monochromatic inorganic light-emitting body 100A can be said to include one type of monochromatic inorganic light-emitting element 102A that emits light in a specific wavelength band.

In this way, the pixel PixA has a first pixel 49R, a second pixel 49G, and a third pixel 49B that respectively display a single color. The first pixel 49R, the second pixel 49G, and the third pixel 49B are referred to as a monochrome pixel 49A unless they are distinguished. The monochromatic pixel 49A may be provided with one type of phosphor 100 (inorganic light-emitting element 102) that emits light in a specific wavelength band. The pixel PixA has three monochromatic pixels 49A. On the other hand, the pixel PixB has monochromatic pixels 49A and auxiliary pixels 49BB. More specifically, the pixel PixB has two monochrome pixels 49A and one auxiliary pixel 49BB. In the example of FIG. 2, the pixel PixB includes a second pixel 49G and a third pixel 49B as two monochromatic pixels 49A, and one auxiliary pixel 49BB.

The auxiliary pixel 49BB includes an auxiliary phosphor 100B. The auxiliary phosphor 100B includes a plurality of auxiliary inorganic light-emitting elements 102B as the inorganic light-emitting element 102. The auxiliary inorganic light-emitting element 102B is the inorganic light-emitting element 102 that emits light when a current for emitting light (a current corresponding to the anode power supply potential PVDD described later) is supplied. When each auxiliary inorganic light emitting element 102B is supplied with a current for emitting light, the wavelength band of the light emitted is different from each other. Specifically, the auxiliary phosphor 100B includes a first auxiliary phosphor 102RB, a second auxiliary phosphor 102GB, and a third auxiliary phosphor 102BB as the auxiliary phosphor 102B. The first auxiliary inorganic light emitting element 102RB emits light in the first wavelength band when a current for emitting light is supplied. The second auxiliary inorganic light emitting element 102GB emits light in the second wavelength band when a current for emitting light is supplied. The third auxiliary inorganic light emitting element 102BB emits light in the third wavelength band when a current for emitting light is supplied.

The auxiliary phosphor 100B (auxiliary pixel 49BB) emits the first wavelength band and the second wavelength when all of the first auxiliary phosphor 102RB, the second auxiliary phosphor 102GB, and the third auxiliary phosphor 102BB emit light White light formed by superimposing light in the third wavelength band and the third wavelength band. However, only a part of the auxiliary phosphor 100B of the plurality of auxiliary phosphors 102B is in a state in which current for light emission can be supplied, in other words, in a state in which light can be emitted. Therefore, the auxiliary phosphor 100B does not actually emit white light, but only emits light in the wavelength band of the auxiliary phosphor 102B, which is a part of the light-emitting state. Specifically, the auxiliary phosphor 100B emits light among the first, second, and third wavelength bands because only one of the auxiliary inorganic light-emitting elements 102B of the plurality of auxiliary inorganic light-emitting elements 102B can emit light. The light of 1 wavelength band. In the example of FIG. 2, the auxiliary phosphor 100B (auxiliary pixel 49BB) is because only the first auxiliary inorganic light-emitting element 102RB, the second auxiliary inorganic light-emitting element 102GB, and the third auxiliary inorganic light-emitting element 102BB The element 102RB is in a state capable of emitting light, and therefore emits light of the first wavelength band (light of the first color) emitted by the first auxiliary inorganic light emitting element 102RB.

In this way, in the example of FIG. 2, the pixel PixB includes a second pixel 49G (second monochromatic phosphor 100GA) that emits light in the second wavelength band, and a third pixel 49B (second 3 Monochromatic phosphor 100BA), and auxiliary pixel 49BB (auxiliary phosphor 100B) that emits light in the first wavelength band. The auxiliary phosphor 100B (auxiliary pixel 49BB) can be described as the auxiliary phosphor 102B (herein the first The auxiliary inorganic light emitting element 102RB) becomes a state capable of emitting light. Moreover, the auxiliary phosphor 100B (auxiliary pixel 49BB) can be described as an auxiliary phosphor 102B (herein The second auxiliary inorganic light-emitting element 102GB and the third auxiliary inorganic light-emitting element 102BB) are in a state where they cannot emit light, that is, a state where electric current for light emission cannot be supplied.

As shown above, the display device 1 includes the pixel PixA and the pixel PixB as the pixel Pix. The pixel PixA is a pixel that has no defects in the monochromatic phosphor 100A contained in the pixel PixA, and all the monochromatic phosphors 100A have not been replaced and remain pixels. On the other hand, the pixel PixB is a pixel in which the defective monochromatic phosphor 100A is replaced with the auxiliary phosphor 100B due to the detection of the defect in the monochromatic phosphor 100A contained in the pixel PixB. In addition, in the example of FIG. 2, for convenience of explanation, there are three pixels PixA and one pixel PixB. However, the arrangement order and number of pixels PixA and pixels PixB depend on which pixel Pix produces a defect, so it is Arbitrary.

3 and 4 are circuit diagrams showing examples of the structure of the pixel circuit of the display device. FIG. 3 shows the circuit configuration connected to the monochromatic phosphor 100A as the phosphor 100, and FIG. 4 shows the circuit configuration connected to the auxiliary phosphor 100B as the phosphor 100.

As shown in FIG. 3, the pixel circuit PICA is provided in each of the first pixel 49R, the second pixel 49G, and the third pixel 49B. The pixel circuit PICA is provided on the substrate 10 and supplies a driving signal (current) to the circuit of the inorganic light-emitting body 100. In addition, in FIG. 3, the description of the pixel circuit PICA can be applied to the pixel circuit PICA of each of the first pixel 49R, the second pixel 49G, and the third pixel 49B.

As shown in FIG. 3, the pixel circuit PICA includes an inorganic light-emitting body 100, 5 transistors, and 2 capacitors. Specifically, the pixel circuit PICA includes: a light-emitting control transistor BCT, an initialization transistor IST, a writing transistor SST, a reset transistor RST, and a driving transistor DRT. A part of the transistor can be shared by a plurality of adjacent pixels 49. For example, the light emission control transistor BCT can be shared by three pixels 49 via a common wiring. In addition, the reset transistor RST is disposed in the peripheral area GA, for example, one reset transistor RST may be disposed for each column of the pixel 49. In this case, the reset transistor RST is connected to the drains of a plurality of driving transistors DRT via a common wiring. However, the reset transistor RST can be connected to the source of the drive transistor DRT.

The plurality of transistors of the pixel circuit PICA are respectively composed of n-type TFTs (Thin Film Transistors). However, it is not limited to this, and each transistor may be composed of p-type TFTs. In the case of using a p-type TFT, the power supply potential or the connection between the holding capacitor Cs1 and the capacitor Cs2 can be appropriately adapted.

The light emission control scan line BG is connected to the gate of the light emission control transistor BCT. The initialization control scan line IG is connected to the gate of the initialization transistor IST. The write control scan line SG is connected to the gate of the write transistor SST. The reset control scan line RG is connected to the gate of the reset transistor RST.

The light emission control scan line BG, the initialization control scan line IG, the write control scan line SG, and the reset control scan line RG are respectively connected to the driving circuit 12 (refer to FIG. 1). The drive circuit 12 respectively supplies the light emission control signal Vbg, the initialization control signal Vig, the write control signal Vsg and the reset control to the light emission control scan line BG, the initialization control scan line IG, the write control scan line SG, and the reset control scan line RG. Signal Vrg.

The driver IC 210 (refer to FIG. 1) supplies the image signal Vsig to the pixel circuit PICA of each of the first pixel 49R, the second pixel 49G, and the third pixel 49B in a time-division manner. A switch circuit such as a multiplexer is provided between each row of the first pixel 49R, the second pixel 49G, and the third pixel 49B and the driving IC 210. The video signal Vsig is supplied to the write transistor SST via the video signal line L2. In addition, the driving IC 210 supplies the reset power supply potential Vrst to the reset transistor RST via the reset signal line L3. The driving IC 210 supplies the initialization potential Vini to the initialization transistor IST via the initialization signal line L4.

The light-emitting control transistor BCT, the initialization transistor IST, the write transistor SST, and the reset transistor RST function as switching elements that select conduction and non-conduction between the two nodes. The driving transistor DRT functions as a current control element corresponding to the voltage between the gate and the drain, and controls the current flowing in the phosphor 100.

The cathode (cathode electrode 114) of the phosphor 100 is connected to the cathode power supply line L10. In addition, the anode (anode terminal 112) of the phosphor 100 is connected to the anode power supply line L1 (first power supply line) via the drive transistor DRT and the light emission control transistor BCT. The anode power supply potential PVDD (first potential) is supplied to the anode power supply line L1. The cathode power supply potential PVSS (second potential) is supplied to the cathode power supply line L10. The anode power supply potential PVDD is higher than the cathode power supply potential PVSS. The cathode power supply line L10 includes a cathode wiring 60.

In addition, the pixel circuit PICA includes a capacitor Cs1 and a capacitor Cs2. The capacitor Cs1 is a holding capacitor formed between the gate and the source of the driving transistor DRT. The capacitor Cs2 is an additional capacitor formed between the source of the driving transistor DRT and the anode of the phosphor 100 and the cathode power line L10.

In addition, the pixel circuit PICA can provide a transistor CCT between the light-emitting control transistor BCT and the driving transistor DRT. In this case, the source of the transistor CCT is connected to the drain of the light-emitting control transistor BCT, and the drain of the transistor CCT is connected to the source of the driving transistor DRT. Furthermore, the gate of the transistor CCT is connected to a wiring CG that supplies a potential to the gate of the transistor CCT. By supplying a potential to the gate of the transistor CCT through the wiring CG, the drain of the light-emitting control transistor BCT and the source of the driving transistor DRT are set to a conductive state, so that the gate of the transistor CCT is not connected by the wiring CG When the potential is supplied, the drain of the light-emitting control transistor BCT and the source of the driving transistor DRT are set to a non-conducting state.

The display device 1 drives from the pixels 49 in the first column to the pixels 49 in the final column, and displays an image of one frame during one frame period.

During the reset period, by the control signals supplied from the driving circuit 12, the electric potential of the light-emitting control scan line BG becomes the L (low) level, and the electric potential of the reset control scan line RG becomes the H (high) level. Thereby, the light emission control transistor BCT becomes off (non-conducting state), and the reset transistor RST becomes conducting (conducting state).

Thereby, the electric charge remaining in the pixel 49 flows to the outside through the reset transistor RST, and the source of the drive transistor DRT is fixed at the reset power potential Vrst. The reset power supply potential Vrst is set to have a specific potential difference with respect to the cathode power supply potential PVSS. In this case, the potential difference between the reset power supply potential Vrst and the cathode power supply potential PVSS is smaller than the potential difference at which the phosphor 100 starts to emit light.

Next, by the control signals supplied from the driving circuit 12, the potential of the initial control scan line IG becomes the H level. The initialization transistor IST becomes conductive. Through the initialization transistor IST, the gate of the driving transistor DRT is fixed at the initialization potential Vini.

Next, by the control signals supplied from the driving circuit 12, the potential of the initial control scan line IG becomes the H level. The initialization transistor IST becomes conductive. Through the initialization transistor IST, the gate of the driving transistor DRT is fixed at the initialization potential Vini.

In addition, the drive circuit 12 turns on the light emission control transistor BCT and turns off the reset transistor RST. When the source potential of the driving transistor DRT becomes (Vini-Vth), it becomes off. In this way, the threshold voltage Vth of the driving transistor DRT can be obtained for each pixel 49, and the unevenness of the threshold voltage Vth of each pixel 49 is cancelled.

Secondly, during the image signal writing operation period, by the control signals supplied from the drive circuit 12, the light-emitting control transistor BCT is turned off, the initialization transistor IST is turned off, and the writing transistor SST is turned on. . In the pixels 49 belonging to one column, the image signal Vsig is input to the gate of the driving transistor DRT. The image signal line L2 extends in the second direction Dy and is connected to a plurality of rows of pixels 49 belonging to the same line. Therefore, the video signal writing operation period is performed for each row.

Secondly, during the light-emitting action. By the control signals supplied from the driving circuit 12, the light-emitting control transistor BCT is turned on, and the writing transistor SST is turned off. The anode power supply potential PVDD is supplied to the driving transistor DRT from the anode power supply line L1 via the light emission control transistor BCT. The driving transistor DRT supplies a current corresponding to the voltage between the gate and the source to the phosphor 100. The phosphor 100 emits light with a brightness corresponding to the current.

In addition, the driving circuit 12 can drive the pixels 49 for each column, can also drive two columns of pixels 49 at the same time, and can also drive more than three columns of pixels 49 at the same time.

In addition, the above-mentioned configuration of the pixel circuit PICA shown in FIG. 3 is ultimately only an example, and can be changed as appropriate. For example, the number of wires and the number of transistors in one pixel 49 may be different. In addition, the pixel circuit PICA may also adopt a structure such as a current mirror circuit.

As shown in FIG. 3, the monochromatic phosphor 100A includes one type of monochromatic inorganic light-emitting element 102A. On the other hand, as shown in FIG. 4, the auxiliary phosphor 100B includes a plurality of kinds of auxiliary inorganic light-emitting elements 102B. As shown in FIG. 4, the auxiliary phosphors 102B of the auxiliary phosphor 100B are arranged side by side. Furthermore, one of the auxiliary inorganic light-emitting elements 102B (here, the first auxiliary inorganic light-emitting element 102RB) among the plurality of auxiliary inorganic light-emitting elements 102B is connected to the cathode power supply line L10 to be supplied with a current for light emission. That is, the current corresponding to the anode power supply potential PVDD emits light. On the other hand, the other auxiliary inorganic light-emitting elements 102B (here, the second inorganic light-emitting element 102GB and the third auxiliary inorganic light-emitting element 102BB) among the plurality of auxiliary inorganic light-emitting elements 102B are disconnected from the cathode power supply line L10, The current for light emission, that is, the current corresponding to the anode power supply potential PVDD is not supplied, and no light is emitted. In addition, although described in detail later, the first auxiliary inorganic light-emitting element 102RB is connected to the opposite cathode electrode 90e and connected to the cathode power supply line L10 to be able to emit light. The second inorganic light-emitting element 102GB and the third inorganic light-emitting element 102GB The auxiliary inorganic light emitting element 102BB is disconnected from the counter cathode electrode 90e and disconnected from the cathode power supply line L10, so that it cannot emit light.

Fig. 5 is a cross-sectional view taken along the line V-V' of Fig. 1; As shown in FIG. 5, the array substrate 2 of the display device 1 includes a substrate 10 and a plurality of transistors. The substrate 10 has a first surface 10a and a second surface 10b on the opposite side of the first surface 10a. The substrate 10 is an insulating substrate, for example, a glass substrate, a quartz substrate, or a flexible substrate made of acrylic resin, epoxy resin, polyimide resin, or polyethylene terephthalate (PET) resin.

In addition, in this specification, in the direction perpendicular to the surface of the substrate 10, the direction from the substrate 10 to the phosphor 100 is referred to as "upper side" or simply "upper". In addition, the direction from the inorganic light-emitting body 100 to the substrate 10 is referred to as "lower side" or simply referred to as "lower". In addition, when expressing the state of arranging another structure on one structure, in the case of simply describing it as "on", as long as there is no special explanation, the following two situations are included, namely: When connecting to a certain structure, another structure is placed directly above, and another structure is placed above a certain structure with another structure interposed therebetween.

The primer layer 20 is provided on the first surface 10a of the substrate 10. In addition, a light shielding layer may be provided on the first surface 10a of the substrate 10. In this case, the primer layer 20 covers the light-shielding layer. The light-shielding layer may be any material if it is a light-shielding layer, but it may be, for example, a molybdenum-tungsten alloy film.

A plurality of transistors are arranged on the undercoat layer 20. For example, in the display area AA of the substrate 10, the driving transistor DRT and the writing transistor SST included in the pixel 49 are respectively provided as a plurality of transistors. In the peripheral area GA of the substrate 10, the transistor TrC included in the driving circuit 12 is provided as a plurality of transistors. In addition, although the driving transistor DRT, the writing transistor SST, and the transistor TrC among the plurality of transistors are displayed, the light-emitting control transistor BCT, the initialization transistor IST, and the reset transistor RST included in the pixel circuit PICA are displayed. It also has the same layered structure as the drive transistor DRT. In addition, in the following description, a plurality of transistors are simply expressed as transistor Tr without distinguishing them.

The transistor Tr is, for example, a TFT with a double-sided gate structure. The transistor Tr has a first gate electrode 21, a second gate electrode 31, a semiconductor layer 25, a source electrode 41s, and a drain electrode 41d. The first gate electrode 21 is provided on the undercoat layer 20. The insulating film 24 is provided on the undercoat layer 20 and covers the first gate electrode 21. The semiconductor layer 25 is provided on the insulating film 24. The semiconductor layer 25 uses, for example, polysilicon. However, the semiconductor layer 25 is not limited to this, and may be microcrystalline oxide semiconductor, amorphous oxide semiconductor, low-temperature polysilicon, or the like. The insulating film 29 is provided on the semiconductor layer 25. The second gate electrode 31 is provided on the insulating film 29.

The undercoat layer 20, the insulating films 24, 29, and 45 are inorganic insulating films, such as silicon oxide (SiO ₂ ) or silicon nitride (SiN). In the third direction Dz, the first gate electrode 21 and the second gate electrode 31 are opposed to each other via the insulating film 24, the semiconductor layer 25, and the insulating film 29. In the insulating films 24 and 29, the part sandwiched between the first gate electrode 21 and the second gate electrode 31 functions as a gate insulating film. In addition, in the semiconductor layer 25, the portion sandwiched between the first gate electrode 21 and the second gate electrode 31 becomes the channel region 27 of the transistor Tr. In the semiconductor layer 25, the part connected to the source electrode 41s is the source region of the transistor Tr, and the part connected to the drain electrode 41d is the drain region of the transistor Tr. Between the channel region 27 and the source region, and between the channel region 27 and the drain region, low-concentration impurity regions are respectively provided. In addition, as the transistor Tr, although only n-type TFTs are shown, p-type TFTs may also be formed at the same time.

The gate line 31a is connected to the second gate electrode 31 of the driving transistor DRT. An insulating film 29 is provided between the substrate 10 and the gate line 31 a, and a capacitor CS is formed between the gate line 31 a and the substrate 10. The first gate electrode 21, the second gate electrode 31, and the gate wire 31a are made of, for example, aluminum (Al), copper (Cu), silver (Ag), molybdenum (Mo), or alloy films thereof.

In this embodiment, the transistor Tr is not limited to the double-sided gate structure. The transistor Tr may be a bottom gate type in which the gate electrode is composed of only the first gate electrode 21. In addition, the transistor Tr may be a top gate type in which the gate electrode is composed of only the second gate electrode 31. In addition, the primer layer 20 may be omitted.

The display device 1 has an insulating film 35 which is provided on the first surface 10a of the substrate 10 and covers a plurality of transistors Tr. The source electrode 41 s is provided on the insulating film 35, and is connected to the respective sources of the plurality of transistors Tr through through holes provided in the insulating film 35. The drain electrode 41d is provided on the insulating film 35, and is connected to the drains of the plurality of transistors Tr through through holes provided in the insulating film 35. In the peripheral area GA, the cathode wiring 60 is provided on the insulating film 35. The insulating film 42 covers the source electrode 41 s, the drain electrode 41 d, and the cathode wiring 60. The insulating film 35 is an inorganic insulating film, and the insulating film 42 is an organic insulating film. The source electrode 41s and the drain electrode 41d are composed of a laminated structure of titanium and aluminum, that is, a laminated film of TiAlTi or TiAl. In addition, an organic material such as photosensitive acrylic is used for the insulating film 42.

A part of the source electrode 41s is formed in a region overlapping with the gate line 31a. A capacitor Cs1 is formed by the gate line 31a and the source electrode 41s that are opposed to each other via the insulating fringe film 35. In addition, the gate line 31a is formed in a region overlapping a part of the semiconductor layer 25. The capacitor Cs1 also includes a capacitor formed by the semiconductor layer 25 and the gate line 31a opposed to the insulating bezel 24.

The display device 1 has: source connection wiring 43s, drain connection wiring 43d, insulating film 45, counter anode electrode 50e, insulating film 66, connection layer 50f, connection conductive portion 52, phosphor 100, insulating film 70, flat The chemical film 80, the opposite cathode electrode 90e, and the cover 92. The source connection wiring 43 s is provided on the insulating film 42 and is connected to the source electrode 41 s through a through hole provided in the insulating film 42. The drain connection wiring 43 d is provided on the insulating film 42 and is connected to the drain electrode 41 d through a through hole provided in the insulating film 42. The insulating film 45 is provided on the insulating film 42 and covers the source connection wiring 43s and the drain connection wiring 43d. The opposite anode electrode 50e is provided on the insulating film 45, and is connected to the drain connection wiring 43d of the driving transistor DRT through a through hole provided in the insulating film 45. The source connection wiring 43s and the drain connection wiring 43d are formed of, for example, a transparent conductor such as indium tin oxide (ITO, Indium Tin Oxide).

The insulating film 66 is provided on the insulating film 45 and covers the opposite anode electrode 50e. The connection layer 50f is provided on the insulating film 66, and is connected to the counter anode electrode 50e via a through hole provided in the insulating film 66. The connection conductive portion 52 is provided on the connection layer 50f. The phosphor 100 is disposed on the connecting conductive portion 52, and the opposite anode electrode 50e is connected to the anode electrode 112 of the phosphor 100 via the connecting layer 50f and the connecting conductive portion 52. A capacitor Cs2 is formed between the opposing anode electrode 50e and the source connection wiring 43s, which are opposed to the insulating fringe film 45.

The insulating film 70 is disposed on the insulating film 45 and covers the connecting layer 50f, the connecting conductive portion 52, and the side surface of the anode electrode 112 of the phosphor 100. The insulating film 70 has an opening for mounting the phosphor 100 at a position overlapping with the anode electrode 112. The area of the opening of the insulating film 70 is larger than the ground surface of the phosphor 100 and the opposite anode electrode 50e in a plan view. In addition, the opposite anode electrode 50e is larger than the ground surface of the phosphor 100 and the opposite anode electrode 50e in a plan view. The planarization film 80 is disposed on the insulating film 70 and covers the side surface of the phosphor 100. The opposite cathode electrode 90e is provided on the planarizing film 80. The insulating film 70 is an inorganic insulating film, and includes, for example, a silicon nitride film (SiN). The planarizing film 80 is an organic insulating film or an inorganic-organic hybrid insulating film (a material in which, for example, an organic group (methyl or phenyl) is bonded to the Si-O main chain). The upper surface (cathode electrode 114) of the phosphor 100 is exposed from the planarization film 80. The opposite cathode electrode 90e is connected to the cathode electrode 114 of the phosphor 100.

The opposite cathode electrode 90 is connected to the cathode wiring 60 provided on the side of the array substrate 2 through the contact hole H11 provided on the outer side of the display area AA. Specifically, the contact hole CH1 is provided in the planarization film 80 and the insulating film 42, and the cathode wiring 14 is provided on the bottom surface of the contact hole CH1. The cathode wiring 60 is provided on the insulating film 35. That is, the cathode wiring 60 is provided in the same layer as the source electrode 41s and the drain electrode 41d, and is formed of the same material. The opposite cathode electrode 90e is continuously arranged from the display area AA to the peripheral area GA, and is connected to the cathode wiring 60 at the bottom of the contact hole CH1. The cover 92 is provided on the opposite cathode electrode 90e. The cover 92 is a cover made of a member for transmitting light, such as glass. However, the cover 92 is not a necessary configuration.

Next, the structure of the monochromatic phosphor 100A in the phosphor 100 will be described. Fig. 6 is a cross-sectional view showing a configuration example of the monochromatic phosphor of this embodiment. As shown in FIG. 6, the monochromatic inorganic light-emitting body 100A has a monochromatic inorganic light-emitting element 102A, an anode electrode 112 and a cathode electrode 114.

The monochromatic inorganic light-emitting element 102A is a light-emitting layer that emits light. The monochromatic inorganic light-emitting element 102A has an n-type cladding layer 104, a p-type cladding layer 106, and a light-emitting layer 108 provided between the p-type cladding layer 106 and the n-type cladding layer 104. In this embodiment, the monochromatic inorganic light-emitting element 102A is configured by sequentially laminating a p-type cladding layer 106, a light-emitting layer 108, and an n-type cladding layer 104 toward the upper side. As the monochromatic inorganic light-emitting element 102A, compound semiconductors such as gallium nitride (GaN), aluminum indium gallium phosphide (AlInGaP), aluminum gallium arsenide (AlGaAs), or gallium arsenide phosphorus (GaAsP) are used. Furthermore, in this embodiment, gallium nitride (GaN) or the like is used for the p-type cladding layer 106 and the n-type cladding layer 104. In addition, as the light-emitting layer 108, indium gallium nitride (InGaN) or the like is used. The light-emitting layer 108 may be a multiple quantum well structure (MQW) laminated with InGaN and GaN.

In the monochromatic phosphor 100A, an anode electrode 112, a p-type cladding layer 106, a light-emitting layer 108, an n-type cladding layer 104, and a cathode electrode 114 are sequentially laminated toward the upper side. Disposed under the monochromatic phosphor 100A: the connecting conductive part 52; and the connecting layer 50f, which is disposed under the connecting conductive part 52 and connected to the opposite anode electrode 50e. On the monochromatic phosphor 100A, an opposite cathode electrode 90e is provided.

The opposite anode electrode 50e (refer to FIG. 5) includes a conductive member, and here includes a metal material. In this embodiment, the counter anode electrode 50e includes titanium (Ti) and aluminum (Al). For example, a layer of titanium and a layer of aluminum are laminated in the third direction Dz. The opposite anode electrode 50e serves as a pixel electrode, and is provided for each monochromatic phosphor 100A (pixel 49).

The connection layer 50f includes a conductive member, and here includes a metal material. In this embodiment, the connection layer 50f is made of the same material as the opposite anode electrode 50e. That is, for example, the connection layer 50f includes titanium (Ti) and aluminum (Al), for example, a layer of titanium and a layer of aluminum are laminated in the third direction Dz.

The connecting conductive portion 52 includes a conductive member, and here includes a metal material. In this embodiment, the connecting conductive portion 52 is made of a material having a lower melting point than that of the connecting layer 50f and the opposite anode electrode 50e. Specifically, the connection conductive portion 52 is, for example, solder, and the connection layer 50 f and the anode electrode 112 are joined.

The anode electrode 112 is disposed on the connection conductive portion 52. The anode electrode 112 is fixed to the connection conductive portion 52. The anode electrode 112 is connected to the counter anode electrode 50e via the connection conductive portion 52 and the connection layer 50f. The anode electrode 112 is a translucent conductive member, and is, for example, indium tin oxide (ITO, Indium Tin Oxide). On the anode electrode 112, a p-type cladding layer 106 is provided. The anode electrode 112 is connected to the p-type cladding layer 106.

The cathode electrode 114 is disposed on the n-type cladding layer 104. The cathode electrode 114 is a transparent conductive member, and is, for example, ITO. The cathode electrode 114 is connected to the counter cathode electrode 90e.

The opposing cathode electrode 90e as the opposing electrode is a translucent conductive member, such as ITO. The opposite cathode electrode 90e is a common electrode provided in common for a plurality of (here, all) phosphors 100 (pixels 49), and is connected to the cathode electrode 114 of a plurality of (here, all) phosphors 100. The opposite cathode electrode 90e is connected to all the monochromatic phosphors 100A and all the auxiliary phosphors 100B.

Next, the structure of the auxiliary phosphor 100B in the phosphor 100 will be described. Fig. 7 is a cross-sectional view showing a configuration example of the auxiliary phosphor of this embodiment. Fig. 8 is a plan view showing a configuration example of the auxiliary phosphor of this embodiment. As shown in FIG. 7, the auxiliary phosphor 100B has a plurality of auxiliary phosphors 102B, a protective layer 109, an anode electrode 112, and a cathode electrode 114. The auxiliary inorganic light emitting element 102B is formed in a columnar shape between the anode electrode 112 and the cathode electrode 114 in the third direction Dz. That is, the auxiliary inorganic light-emitting element 102B is a columnar member extending between the anode electrode 112 and the cathode electrode 114 with the third direction Dz as the axial direction. As shown in FIG. 8, the auxiliary inorganic light-emitting element 102B has a cylindrical shape, for example, but is not limited to a cylindrical shape, and may have a polygonal pillar shape such as a hexagon. The protective layer 109 is disposed between the anode electrode 112 and the cathode electrode 114 in the third direction Dz, and surrounds the periphery of the auxiliary inorganic light-emitting element 102B. The protective layer 109 is an insulator, such as SOG (Spin on Glass).

The auxiliary inorganic light-emitting element 102B is a light-emitting layer that emits light, and has an n-type cladding layer 104B, a p-type cladding layer 106B, and a light-emitting layer 108B provided between the p-type cladding layer 106B and the n-type cladding layer 104B. In this embodiment, the auxiliary inorganic light-emitting element 102B is configured by sequentially stacking a p-type cladding layer 106B, a light-emitting layer 108B, and an n-type cladding layer 104B toward the upper side. As the auxiliary inorganic light-emitting element 102B, compound semiconductors such as gallium nitride (GaN), aluminum indium gallium phosphide (AlInGaP), aluminum gallium arsenide (AlGaAs), or gallium arsenide phosphorus (GaAsP) are used. Furthermore, in this embodiment, gallium nitride (GaN) or the like is used for the p-type cladding layer 106B and the n-type cladding layer 104B. In addition, as the light-emitting layer 108B, indium gallium nitride (InGaN) or the like is used. The light-emitting layer 108B may be a multiple quantum well structure (MQW) in which InGaN and GaN are laminated.

The auxiliary phosphor 100B faces upward, and an anode electrode 112, a plurality of auxiliary phosphors 102B, and a cathode electrode 114 are laminated in this order. Under the auxiliary phosphor 100B, a connecting conductive portion 52 is provided; and a connecting layer 50f is provided under the connecting conductive portion 52 and connected to the opposite anode electrode 50e. On the auxiliary phosphor 100B, an opposing cathode electrode 90e is provided. The opposite anode electrode 50e (refer to FIG. 5) serves as a pixel electrode and is provided for each auxiliary phosphor 100B.

The anode electrode 112 is disposed on the connecting conductive portion 52 and fixed to the connecting conductive portion 52. The anode electrode 112 is connected to the counter anode electrode 50e via the connection conductive portion 52 and the connection layer 50f. On the anode electrode 112, each auxiliary inorganic light-emitting element 102B is provided. The anode electrode 112 is connected to the p-type cladding layer 106B of each auxiliary inorganic light emitting element 102B. Here, a barrier metal (such as platinum (Pt), nickel (Ni), titanium tungsten (TiW)), etc. may be provided between the connection layer 50f and the connection conductive portion 52, and the connection layer 52f and the anode electrode 112.

The cathode electrode 114 is disposed on each auxiliary inorganic light-emitting element 102B and connected to the n-type cladding layer 104B of each auxiliary inorganic light-emitting element 102B. On the cathode electrode 114, an opposite cathode electrode 90e is provided. The opposite cathode electrode 90e is connected to the cathode electrode 114.

In this way, in one auxiliary phosphor 100B, the counter anode electrode 50e, the connection layer 50f, the connection conductive portion 52, and the anode electrode 112 as the electrode are provided in common for the plurality of auxiliary phosphors 102B. Similarly, in one auxiliary phosphor 100B, the cathode electrode 114 and the counter cathode electrode 90e are provided in common for the plurality of auxiliary phosphors 102B. In other words, the counter anode electrode 50e, the connection layer 50f, the connection conductive portion 52, the anode electrode 112, the cathode electrode 114, and the counter cathode electrode 90e are related to the plurality of auxiliary phosphors 102B contained in one auxiliary phosphor 100B. Set one.

In addition, the auxiliary phosphor 100B may have a cladding layer provided in common to the plurality of auxiliary phosphors 102B between the cathode electrode 114 and the opposite cathode electrode 90e. The cladding layer may be a compound semiconductor such as gallium nitride.

The auxiliary phosphor 100B has a first auxiliary phosphor 102RB, a second auxiliary phosphor 102GB, and a third auxiliary phosphor 102BB as the auxiliary phosphor 102B. The first auxiliary inorganic light-emitting element 102RB, the second auxiliary inorganic light-emitting element 102GB, and the third auxiliary inorganic light-emitting element 102BB are common in that they have the n-type cladding layer 104B, the light-emitting layer 108B, and the p-type cladding layer 106B. The widths when viewed in the third direction Dz are different from each other. The width when viewed from the third direction Dz means the length of the auxiliary inorganic light-emitting element 102B in the direction orthogonal to the third direction Dz. In this example, since the auxiliary inorganic light-emitting element 102B is cylindrical, the width when viewed from the third direction Dz refers to the diameter of the auxiliary inorganic light-emitting element 102B. That is, as shown in FIG. 8, if the diameter of the first auxiliary inorganic light-emitting element 102RB is set as the diameter DR, the diameter of the second auxiliary inorganic light-emitting element 102GB is set as the diameter DG, and the diameter of the third auxiliary inorganic light-emitting element 102BB is If the diameter DB is used, the diameter DR, the diameter DG, and the diameter DB have different lengths. In this embodiment, the diameter DR is greater than the diameter DG, and the diameter DG is greater than the diameter DB. Although the auxiliary inorganic light-emitting element 102B has the same structure with the n-type cladding layer 104B, the light-emitting layer 108B, and the p-type cladding layer 106B, it can emit light in different wavelength bands by being different in diameter as described above.

In addition, as described above, in the auxiliary phosphor 100B, only a part of the plurality of auxiliary phosphors 102B can emit light. Specifically, in the auxiliary phosphor 100B, only one part of the plurality of auxiliary phosphors 102B is connected to the cathode electrode 114 and the opposite cathode electrode 90e to be able to emit light, and the other auxiliary phosphors 102B Since it is not connected to the cathode electrode 114 and the opposite cathode electrode 90e, it becomes a state where light cannot be emitted. In the example of FIGS. 7 and 8, the first auxiliary inorganic light-emitting element 102RB is connected to the cathode electrode 114 and the opposite cathode electrode 90e, and the second auxiliary inorganic light-emitting element 102GB and the third auxiliary inorganic light-emitting element 102BB are not connected to the cathode electrode 114. And the opposite cathode electrode 90e. In other words, on the first auxiliary inorganic light emitting element 102RB, the cathode electrode 114 and the opposite cathode electrode 90e are provided, but on the second auxiliary inorganic light emitting element 102GB and the third auxiliary inorganic light emitting element 102BB, the cathode electrode 114 and the opposite electrode are not provided. Cathode electrode 90e. In the auxiliary phosphor 100B, since only the first auxiliary phosphor 102RB is connected to the counter cathode electrode 90e, only the first auxiliary phosphor 102RB is supplied with current, and only the first auxiliary phosphor 102RB emits light. In addition, in this embodiment, in the second auxiliary inorganic light emitting element 102GB and the third auxiliary inorganic light emitting element 102BB, both the cathode electrode 114 and the counter cathode electrode 90e are not connected, but at least the counter cathode electrode 90e is not connected. That is, even if the second auxiliary inorganic light emitting element 102GB and the third auxiliary inorganic light emitting element 102BB are connected to the cathode electrode 114, as long as they are disconnected from the counter cathode electrode 90e, no current is supplied and no light is emitted.

In addition, a plurality of first auxiliary inorganic light-emitting elements 102RB are provided, and are arranged in a matrix in a plane orthogonal to the third direction Dz. Similarly, the second auxiliary inorganic light-emitting element 102GB and the third auxiliary inorganic light-emitting element 102BB are respectively provided in plural, and are arranged in a matrix in a plane orthogonal to the third direction Dz. Here, as shown in FIG. 8, in one auxiliary phosphor 100B, when viewed from the third direction Dz, the area where the first auxiliary phosphor 102RB is installed is set as the first area 103RB, and the second auxiliary phosphor 100B The area where the inorganic light-emitting element 102GB is installed is referred to as the second area 103GB, and the area where the third auxiliary inorganic light-emitting element 102BB is installed is referred to as the third area 103BB. In this case, the areas of the first area 103RB, the second area 103GB, and the third area 103BB are different from each other. In the example of this embodiment, it is preferable that the area of the first region 103RB is larger than the area of the second region 103GB, and the area of the second region 103GB is larger than the area of the third region 103BB. In addition, in this embodiment, the second area 103GB and the third area 103BB are adjacent to each other in the second direction Dy, and the first area 103RB is adjacent to the second area 103GB and the third area 103BB in the first direction Dx. However, the arrangement of the first area 103RB, the second area 103GB, and the third area 103BB is arbitrary.

In addition, hereinafter, in one auxiliary phosphor 100B, a structure including all auxiliary phosphors 102B is referred to as auxiliary phosphor assembly 101B. That is, the auxiliary phosphor assembly 101B includes all auxiliary phosphors 102B of one auxiliary phosphor 100B, and furthermore, may include the protective layer 109.

The monochromatic phosphor 100A and the auxiliary phosphor 100B have the above configuration. When viewed from the direction in which the phosphor 100 and the opposite cathode electrode 90e are arranged, that is, when viewed from the third direction Dz, the area where one auxiliary phosphor 100B is provided is better than one The monochromatic phosphor 100A has a wider area. The area where the auxiliary phosphor 100B is provided means, for example, the anode electrode 112, which is the electrode under the auxiliary phosphor 100B, and the area where the monochromatic phosphor 100A is provided, for example, means the area under the single color phosphor 100A. The electrode is the anode electrode 112.

Moreover, although the auxiliary phosphor 102B of the auxiliary phosphor 100B has a columnar so-called nanowire shape as described above, the monochromatic phosphor 102A of the monochromatic phosphor 100A is not a nanowire shape. However, the monochromatic inorganic light-emitting element 102A of the monochromatic phosphor 100A may also be in the shape of a nanowire. In this case, the monochromatic phosphor 100A is composed of columnar monochromatic inorganic light emitting elements 102A with the same structure as the auxiliary inorganic light emitting element 102B. However, since the monochromatic inorganic light emitting element 102A emits the same wavelength band Therefore, the diameter of each monochromatic inorganic light-emitting element 102A becomes the same (in a specific numerical range in more detail).

(Method of manufacturing display device) Next, the manufacturing method of the display device 1 and, more specifically, the mounting method of the auxiliary phosphor 100B will be described. The display device 1 provided with the inorganic light-emitting body 100 may be difficult to manufacture due to, for example, the difficulty of mounting due to the small size of the inorganic light-emitting body 100, which may cause defects. If the display device 1 deemed to be defective is not used and discarded, the yield will decrease. In contrast, in the present embodiment, the display device 1 deemed defective is repaired, and the defective display device 1 is put into a usable state, thereby suppressing a decrease in yield. The defect here means that at least a part of the monochromatic phosphor 100A mounted on the display device 1 does not emit light appropriately. Examples of the state in which the monochromatic phosphor 100A does not emit light appropriately include a dark spot state or a bright spot state. The dark spot state means a state in which the monochromatic phosphor 100A does not emit light even when a current for making the monochromatic phosphor 100A emits light is passed. On the other hand, the bright spot state means a state in which the phosphor 100 emits light even when the current for making the phosphor 100 emits light is not circulated. That is, even when the current for making the phosphor 100 emits light is not flowing, the state of the phosphor 100 emitting light is a bright spot state due to, for example, a short circuit in other wirings.

In this embodiment, by replacing the monochromatic phosphor 100A that has become defective as described above with the auxiliary phosphor 100B, the display device 1 can be put into a usable state. Hereinafter, the manufacturing method of the display device 1 including replacement will be described. FIG. 9 is a schematic diagram illustrating the manufacturing method of the display device of the first embodiment.

As shown in step S10 of FIG. 9, in the manufacturing method of the display device 1 of this embodiment, the array substrate 2 of the display device 1 is formed, and the monochromatic inorganic light-emitting element 102A is formed on the array substrate 2. Specifically, the array substrate 2 is formed by forming parts of the display device 1 below the anode electrode 112 and the anode electrode 112. In addition, a monochromatic inorganic light-emitting element 102A is formed on a formation substrate 200 different from the array substrate 2. Then, the monochromatic inorganic light emitting element 102A formed on the formation substrate 200 is mounted on the array substrate 2. In this embodiment, the monochromatic inorganic light-emitting element 102A is mounted on the array substrate 2 by laser peeling. Specifically, the surface of the substrate 200 on which the monochromatic inorganic light-emitting element 102A is formed and the surface of the array substrate 2 on which the anode electrode 112 is formed face each other. Then, from the surface opposite to the surface on which the monochromatic inorganic light-emitting element 102A is formed on the formation substrate 200, the laser light LI is irradiated toward the monochromatic inorganic light-emitting element 102A on the formation substrate 200. Thereby, the monochromatic inorganic light emitting element 102A is peeled from the forming substrate 200 and transferred to the anode electrode 112 of the array substrate 2. In addition, although in the example of FIG. 9, the first single-color inorganic light-emitting element 102RA, the second single-color inorganic light-emitting element 102GA, and the third single-color inorganic light-emitting element 102BA are formed on the formation substrate 200, the first The monochromatic inorganic light emitting element 102RA, the second monochromatic inorganic light emitting element 102GA, and the third monochromatic inorganic light emitting element 102BA are formed on different formation substrates. In this case, the first single-color inorganic light-emitting element 102RA, the second single-color inorganic light-emitting element 102GA, and the third single-color inorganic light-emitting element 102BA are sequentially transferred onto the array substrate 2. In addition, the method of mounting the monochromatic inorganic light-emitting element 102A on the array substrate 2 is not limited to laser lift-off, and may be arbitrary.

After the monochromatic inorganic light-emitting element 102A is formed on the array substrate 2, as shown in step S12, the inspection substrate 202 is connected to the monochromatic inorganic light-emitting element 102A on the array substrate 2 and the lighting inspection is performed. The defect of the single-color inorganic light-emitting element 102A is detected. The inspection substrate 202 includes a conductive portion 202A and a base portion 202B. The conductive portion 202A is a translucent conductive member such as ITO. The base 202B is a substrate provided on the back surface of the conductive portion 202A, and is a translucent insulating member such as glass. In step S12, by contacting the surface of the conductive portion 202A with the surface on the upper side of each single-color inorganic light-emitting element 102A on the array substrate 2, that is, the n-type cladding layer 104, each single-color inorganic light-emitting element 102A and The conductive portion 202A is electrically connected. Then, by applying a potential difference (applied voltage) between the anode electrode 112 of each array substrate 2 and the conductive portion 202A, a current for emitting light flows through the monochromatic inorganic light-emitting element 102A. Then, it is checked whether the monochromatic inorganic light-emitting element 102A emits light appropriately, the monochromatic inorganic light-emitting element 102A that appropriately emits light is judged as a normal monochromatic inorganic light-emitting element 102A that is not defective, and the monochromatic inorganic light-emitting element 102A that does not emit light appropriately 102A is judged to be a defective single-color inorganic light-emitting element 102A. Since the inspection substrate 202 is light-transmissive, it can be confirmed from above the inspection substrate 202 whether or not the monochromatic inorganic light-emitting element 102A emits light. Hereinafter, the single-color inorganic light-emitting element 102A judged to be defective is referred to as a defective inorganic light-emitting element 102N. In this way, although in this embodiment, the defective inorganic light-emitting element 102N is detected by the lighting inspection using the inspection substrate 202, the detection method of the defective inorganic light-emitting element 102N is not limited to the lighting inspection using the inspection substrate 202 .

After the defective inorganic light-emitting element 102N is detected, the defective inorganic light-emitting element 102N is removed from the array substrate 2 as shown in step S14. FIG. 9 shows an example in which a first single-color inorganic light-emitting element 102RA is detected as a defective inorganic light-emitting element 102N. In step S14, the defective inorganic light-emitting element 102N, that is, the first single-color inorganic light-emitting element 102RA, is removed from the array substrate 2 under the anode electrode 112 as it is. Thereby, the array substrate 2 is in a state where the anode electrode 112 on which the defective inorganic light-emitting element 102N is mounted, and the single-color inorganic light-emitting element 102A is not mounted.

In this way, in the example of FIG. 9, all the single-color inorganic light-emitting elements 102A are mounted on the array substrate 2, and the defective inorganic light-emitting elements 102N are detected from the single-color inorganic light-emitting elements 102A mounted on the array substrate 2. However, the timing of detecting the defective inorganic light-emitting element 102N is not limited to this. For example, in the state where the monochromatic inorganic light-emitting element 102A is formed on the formation substrate 200, that is, in the state before the monochromatic inorganic light-emitting element 102A is transferred to the array substrate 2, the self-forming substrate 200 In the single-color inorganic light-emitting element 102A, a defective inorganic light-emitting element 102N was detected. In this case, for example, a photoluminescence method can be used to detect the defective inorganic light-emitting element 102N from the monochromatic inorganic light-emitting element 102A on the substrate 200. In the photoluminescence method, light is irradiated to the monochromatic inorganic light-emitting element 102A, and the light emitted when the electrons of the excited monochromatic inorganic light-emitting element 102A return to the ground state is detected. Based on the light, the monochromatic inorganic light-emitting element 102A such as defects is detected The state. Then, based on the state of the monochromatic inorganic light-emitting element 102A detected by, for example, the photoluminescence method, it is determined whether it is a defective inorganic light-emitting element 102N. The monochromatic inorganic light-emitting element 102A whose defect is detected by, for example, a photoluminescence method can be judged as a defective inorganic light-emitting element 102N. In this way, when the defective inorganic light-emitting element 102N is detected before being transferred to the array substrate 2, the monochromatic inorganic light-emitting element 102A other than the defective inorganic light-emitting element 102N on the substrate 200 is transferred to the array substrate 2 without transferring The defective inorganic light-emitting element 102N is transferred to the array substrate 2. In this case, the array substrate 2 is in a state where the single-color inorganic light-emitting element 102A is not mounted on the anode electrode 112 where the defective inorganic light-emitting element 102N should be mounted, that is, the state is the same as that after the execution of step S14.

Next, as shown in step S16, on the anode electrode 112 equipped with the defective inorganic light-emitting element 102N (or on the anode electrode 112 where the defective inorganic light-emitting element 102N should be mounted), the auxiliary inorganic light-emitting element assembly 101B (including 1 The structure of all the auxiliary phosphors 102B of the auxiliary phosphors 100B). In this way, the single-color inorganic light-emitting element 102A and the auxiliary inorganic light-emitting element 102B are formed on the array substrate 2.

Next, as shown in step S18, on the array substrate 2, a monochromatic phosphor 100A, an auxiliary phosphor 100B, an insulating film 70, a planarizing film 80, and a counter cathode electrode 90e are formed. Specifically, a cathode electrode 114 is formed on each of the monochromatic inorganic light-emitting element 102A and the auxiliary inorganic light-emitting element 102B. In this way, the monochromatic phosphor 100A and the auxiliary phosphor 100B are formed on the array substrate 2. Then, the space where the single-color phosphor 100A and the auxiliary phosphor 100B are not formed on the array substrate 2 is filled with the insulating film 70 and the planarizing film 80. Then, the opposite cathode electrode 90e is formed on the monochromatic phosphor 100A and the auxiliary phosphor 100B. Here, the opposite cathode electrode 90e is formed so as to be connected to all the single-color phosphors 100A and the auxiliary phosphor 100B.

Next, as shown in step S20, a part of the opposite cathode electrode 90e connected to the auxiliary phosphor 100B and a part of the cathode electrode 114 of the auxiliary phosphor 100B are removed. For example, by irradiating the laser light LIa toward the removed portion of the opposite cathode electrode 90e and the cathode electrode 114, the opposite cathode electrode 90e and the cathode electrode 114 are removed. Specifically, the portion of the opposite cathode electrode 90e and the cathode electrode 114 connected to the second auxiliary phosphor 100B of the auxiliary phosphor 100B and the third auxiliary phosphor 102BB connected to the auxiliary phosphor 100B are removed. part. As a result, as shown in FIGS. 7 and 8, the first auxiliary phosphor 102RB of the auxiliary phosphor 100B is connected to the opposite cathode electrode 90e to be in a state capable of emitting light, and the second auxiliary phosphor 102GB and the third auxiliary phosphor can emit light. The inorganic light-emitting element 102BB and the counter cathode electrode 90e are disconnected and cannot emit light. That is, in step S20, it is assumed that the opposing cathode electrode 90e and the cathode electrode 114 are for the auxiliary inorganic light emitting light in the same wavelength band as the light emitted when the defective inorganic light emitting element 102N is in the normal state. The connected state of the light-emitting element 102B. Furthermore, for the auxiliary inorganic light emitting element 102B that emits light in a wavelength band different from the light in the wavelength band emitted when the defective inorganic light emitting element 102N is in a normal state, the opposite cathode electrode 90e and the cathode electrode 114 are set to be non-connected state.

After step S20, as shown in step S22, the space AR formed by removing a part of the opposite cathode electrode 90e and a part of the cathode electrode 114 is filled with the insulator 80B. The insulator 80B is, for example, insulating resin. However, the filling of the insulator 80B is not a necessary process. Furthermore, after that, a cover portion 92 can be formed on the opposite cathode electrode 90e.

As described above, in this embodiment, the display device 1 is in a state where the defective phosphor (defective phosphor 102N) is not mounted, and instead, the auxiliary phosphor 100B is mounted. Therefore, the display device 1 of the present embodiment can prevent the image display from becoming unsuitable due to poor light emission of the poor phosphor. Furthermore, the display device 1 is equipped with the auxiliary phosphor 100B, so that it can emit light in the wavelength band that should emit light when the defective phosphor is normal, and the image display can be better prevented from becoming unsuitable. In addition, it is also considered to replace the non-performing phosphor with a single-color phosphor 100A that emits a single-color light. However, since it is difficult to predict which wavelength band (color) of the phosphor 100 that emits light will become defective, there is a need to prepare a plurality of monochromatic phosphors 100A for replacement. Moreover, there is also a situation where the need to sequentially mount the monochromatic phosphors 100A for each type during the reinstallation process, and the work load of the reinstallation process becomes higher. In contrast, in the present embodiment, the auxiliary phosphor 100B for replacement includes a plurality of auxiliary phosphors 102B that emit light in different wavelength bands. Therefore, one kind of auxiliary phosphor 100B can be used to replace all kinds of phosphors 100, and there is no need to prepare multiple kinds of phosphors 100 for replacement. In addition, since one type of auxiliary phosphor 100B can be replaced, the work load of the replacement process can be suppressed.

(Drive control of auxiliary phosphor) Next, the method of driving control of the auxiliary phosphor 100B, that is, the auxiliary pixel 49BB, will be described. FIG. 10 is a block diagram schematically showing the structure of the signal processing circuit. Hereinafter, a case where the auxiliary phosphor 100B, that is, the auxiliary pixel 49BB emits light in the first wavelength band, which is red light here, will be described as an example. However, the auxiliary pixel 49BB is not limited to emitting light in the first wavelength band, and may emit light in the second wavelength band or the third wavelength band.

As shown in FIG. 10, the signal processing circuit 160 included in the display device 1 includes a first processing circuit 162, a memory 164, and a buffer 166. The signal processing circuit 160 calculates the output gray scale values SoR, SoG, and SoB of each of the three pixels 49 based on the video signal Vsig. The image signal Vsig includes the input gray scale values SiR, SiG, and SiB of each pixel Pix. The input grayscale values SiR, SiG, SiB are the grayscale values of red, green, and blue respectively. The output gray scale value SoR is the gray scale value corresponding to the auxiliary pixel 49BB replacing the first pixel 49R. In addition, the output gray scale value SoG is a gray scale value corresponding to the second pixel 49G, and the output gray scale value SoB is a gray scale value corresponding to the third pixel 49B. The signal processing circuit 160 may be included in, for example, the driving IC 210 shown in FIG. Hereinafter, when there is no need to distinguish the output gray scale values SoR, SoG, and SoB separately, it is referred to as the output gray scale value So. In addition, when there is no need to distinguish the input gray scale values SiR, SiG, and SiB separately, it is called the input gray scale value Si.

The buffer 166 is a circuit that stores the input gray level value Si. In addition, the buffer 166 can store the input gray level value Si contained in the image signal Vsig of 1 frame, and can also capture the input gray value Si contained in the image signal Vsig of a part of the image signal Vsig of 1 frame. Order value Si.

The memory 164 includes a data LUT representing information about the relationship between the input gray scale values SiR, SiG, and SiB, and the output gray scale values SoR, SoG, and SoB. The data LUT is, for example, table data such as a look up table (Look Up Table).

The first processing circuit 162 refers to the data LUT read from the memory 164 to specify the output gray scale values SoR, SoGb, and SoB corresponding to the input gray scale values SiR, SiG, and SiB. The first processing circuit 162 outputs the output gray scale values SoR, SoG, and SoB to the pixel Pix. Each pixel 49 lights up based on the output grayscale values SoR, SoG, and SoB.

Fig. 11 is a flowchart for explaining the setting method of the output gray scale value in the first embodiment. As shown in FIG. 11, first, the signal processing circuit 160 captures a 1-frame image (step S30). Specifically, the buffer 166 captures the image signal Vsig of 1 frame, and memorizes the input grayscale values SiR, SiG, and SiB corresponding to each of red, green, and blue.

The first processing circuit 162 determines whether the input gray scale value SiR is greater than 0 for each pixel Pix (step S32). In other words, it is judged whether there is a red display for each pixel Pix. When the input gray scale value SiR is greater than 0 (step S32; Yes), the first processing circuit 162 compares the input gray scale value SiR with the threshold value Lth (step S34). Although the value of the threshold Lth is preset, it can be set arbitrarily. When the input gray scale value SiR is below the threshold value Lth (step S34; Yes), the first processing circuit 162 sets the output gray scale value SoR for lighting the auxiliary phosphor 100B (auxiliary pixel 49BB) to set The output gray scale value SoR makes the auxiliary phosphor 100B light up (step S36).

When the input gray scale value SiR is greater than the threshold value Lth (step S34; No), the first processing circuit 162 determines whether the driving current value is less than the current threshold value Ith (step S38). The driving current value is the current value flowing in the auxiliary phosphor 100B assuming that the auxiliary phosphor 100B is lit with the output gray scale value SoR. The first processing circuit 162 calculates the drive current value based on the output gray scale value SoR. In addition, although the current threshold Ith value is preset, it can be set arbitrarily. When the driving current value is less than the current threshold value Ith (step S38; Yes), proceed to step S36 to light up the auxiliary phosphor 100B with the set output gray scale value SoR.

When the driving current value is greater than the current threshold value Ith (step S38; No), the first processing circuit 162 turns on the auxiliary phosphor 100B and the adjacent phosphor (step S40). In the phosphor 100 of the adjacent phosphor 100 of the pixel Pix adjacent to the pixel Pix containing the auxiliary phosphor 100B, the phosphor 100 emits light in the same wavelength band as the light emitted by the auxiliary phosphor 100B. That is, here, the first monochromatic phosphor 100RA contained in the adjacent phosphor system and the pixel Pix adjacent to the pixel Pix containing the auxiliary phosphor 100B, or the first monochromatic phosphor 100RA contained in and contained in the pixel Pix containing the auxiliary phosphor 100B The pixel Pix adjacent to the pixel Pix emits the auxiliary phosphor 100B of light in the first wavelength band. In step S40, the first processing circuit 162 sets: the output gray scale value SoR1 for driving the auxiliary phosphor 100B, the output gray scale value SoR2 for driving the adjacent phosphor, to set the output gray scale value SoR1 , The auxiliary phosphor 100B is lit, and the adjacent phosphor is lit with the set output gray scale value SoR2. The output gray scale value SoR1 is set to a value smaller than the output gray scale value SoR.

In addition, when the input gray scale value SiR is 0 (step S32; No), the first processing circuit 162 sets the gray scale value 0 as the output gray scale value SoR, and does not light up the auxiliary phosphor 100B (auxiliary pixel 49BB ) (Step S42).

In this embodiment, as described above, the driving (lighting) of the auxiliary phosphor 100B is controlled.

As described above, the display device 1 of this embodiment includes a plurality of phosphors 100 arranged in a matrix, and a counter electrode (a counter cathode electrode 90e) connected to the plurality of phosphors 100. The plural phosphors 100 include a monochromatic phosphor 100A and an auxiliary phosphor 100B. The monochromatic phosphor 100A can emit light in a specific wavelength band. In addition, the auxiliary phosphor 100B includes a plurality of kinds of auxiliary inorganic light-emitting elements 102B, and electrodes (anode electrodes 112) connected to the auxiliary inorganic light-emitting elements 102B. The auxiliary phosphor 100B includes: a first auxiliary inorganic light-emitting element 102RB that can emit light in the first wavelength band when current is supplied, and a second auxiliary inorganic light-emitting element 102RB that can emit light in the second wavelength band when current is supplied. The auxiliary inorganic light-emitting element 102GB serves as a plurality of auxiliary inorganic light-emitting elements 102B. The (anode electrode 112) is connected to the first auxiliary inorganic light-emitting element 102RB and the second auxiliary inorganic light-emitting element 102GB. In addition, the counter electrode (counter cathode electrode 90e) is connected to the monochromatic phosphor 100A and the first auxiliary phosphor 102RB, and is not connected to the second auxiliary phosphor 102GB.

The display device 1 of this embodiment includes an auxiliary inorganic light-emitting element 102B. That is, the display device 1 can also mount the auxiliary inorganic light-emitting element 102B instead of the defective inorganic light-emitting body even in the case where a defective inorganic light-emitting body (bad inorganic light-emitting element 102N) is manufactured, thereby preventing image display from becoming poor. Appropriate, even in the case of defects during manufacturing, it can be set to a state that can be used appropriately. In addition, since the auxiliary phosphor 100B is provided with a plurality of kinds of auxiliary phosphors 102B that can emit light in different wavelength bands, one auxiliary phosphor 100B can be used to replace all kinds of phosphors 100, which can suppress The burden of dressing.

In addition, the wavelength band of the light emitted by the first auxiliary inorganic light-emitting element 102RB, that is, the first wavelength band is different from the wavelength band of the light emitted by the monochromatic phosphor 100A included in the same pixel PixB as the first auxiliary inorganic light-emitting element 102RB . That is, in one pixel Pix, the wavelength band of the light emitted by the first auxiliary inorganic light emitting element 102RB and the light emitted by the monochromatic phosphor 100A, which is connected to the opposite cathode electrode 90e and in a state capable of emitting light different. Therefore, the display device 1 can use the first auxiliary phosphor 102RB of the auxiliary phosphor 100B to irradiate the light that the poor phosphor should emit, and the auxiliary phosphor 100B and the monochromatic phosphor 100A can appropriately The color is expressed, and the image can be displayed appropriately.

In addition, the wavelength band of the light emitted by the second auxiliary inorganic light-emitting element 102GB, that is, the second wavelength band, is the same as the wavelength band of the light emitted by the monochromatic phosphor 100A included in the same pixel PixB as the second auxiliary inorganic light-emitting element 102GB overlapping. That is, in one pixel PixB, the wavelength band of the light emitted by the second auxiliary inorganic light-emitting element 102GB, which is disconnected from the opposite cathode electrode 90e and in a non-luminous state, is the same as the light emitted by the monochromatic phosphor 100A The wavelength bands overlap. That is, the auxiliary phosphor 100B sets the second auxiliary phosphor 102GB that emits light in the same wavelength band as the monochromatic phosphor 100A included in the same pixel Pix into a state where it cannot emit light. Therefore, the display device 1 suppresses the collapse of the color balance and can appropriately display an image.

In addition, the first auxiliary phosphor 102RB and the second auxiliary phosphor 102GB are columnar, and the width (diameter DR) of the first auxiliary phosphor 102RB and the second auxiliary phosphor 102RB when viewed from the third direction Dz as the axial direction 2 The width (diameter DG) of the auxiliary inorganic light-emitting element 102GB is different. In the auxiliary phosphor 100B, the first auxiliary phosphor 102RB and the second auxiliary phosphor 102GB are columnar and have different widths. For example, even if the structure is the same, the emitted wavelength bands can be different. Therefore, the auxiliary phosphor 100B can be easily manufactured.

In addition, in the case of viewing from the direction in which the phosphor 100 and the counter electrode (counter cathode electrode 90e) are arranged, that is, the third direction Dz, the area where one auxiliary phosphor 100B is provided is better than the area where one auxiliary phosphor 100B is provided. The area of the phosphor 100A is wider. By forming the auxiliary phosphor 100B wider, the area of the auxiliary phosphor 102B that can suppress light emission becomes too small, and the intensity of the light from the auxiliary phosphor 102B is suppressed from becoming too weak. Therefore, according to the display device 1, the collapse of the color balance is suppressed, and an image can be appropriately displayed.

Furthermore, when viewed from the third direction Dz, the area of the region 103RB where the first auxiliary inorganic light-emitting element 102RB is provided is different from the area of the region 103GB where the second auxiliary inorganic light-emitting element 102GB is provided. By making the area different for each type of the auxiliary inorganic light-emitting element 102B as described above, the color can be appropriately expressed, and the image can be appropriately displayed.

In addition, the auxiliary phosphor 100B further includes a third auxiliary phosphor 102BB that can emit light in the third wavelength band when current is supplied. The counter electrode (counter cathode electrode 90e) is not connected to the third auxiliary inorganic light emitting element 102BB. The auxiliary phosphor 100B is provided with the first auxiliary phosphor 102RB, the second auxiliary phosphor 102GB, and the third auxiliary phosphor 102BB, and no matter which color of the phosphor 100 is defective, it can assist inorganic luminescence. Body 100B is replaced.

In addition, the phosphor 100 includes: a monochromatic phosphor 100A (second monochromatic phosphor 100GA) capable of emitting light in the second wavelength band, and a monochromatic phosphor 100A capable of emitting light in the third wavelength band (The third monochromatic phosphor 100BA). Since the display device 1 is equipped with an auxiliary phosphor 100B that emits light in the first wavelength band, and a monochromatic phosphor 100A that emits light in the second and third wavelength bands, it can appropriately express colors and is suitable for To display the image.

In addition, the manufacturing method of the display device 1 of this embodiment includes a step of forming a monochromatic phosphor, a step of forming an auxiliary phosphor, and a step of forming a counter electrode. In the step of forming a monochromatic phosphor, a monochromatic phosphor 100A that can emit light in a specific wavelength band is formed. In the auxiliary phosphor forming step, an auxiliary phosphor 100B is formed. The auxiliary phosphor 100B includes: a first auxiliary phosphor 102RB that can emit light in the first wavelength band when a voltage is applied; The second auxiliary inorganic light-emitting element 102GB that can emit light in the second wavelength band when a voltage is applied, and the electrode (anode electrode 112) connected to the first auxiliary inorganic light-emitting element 102RB and the second auxiliary inorganic light-emitting element 102GB. In the step of forming the counter electrode, a counter electrode (counter cathode electrode 90e) is formed, and the counter electrode (counter cathode electrode 90e) is connected to the monochromatic phosphor 100A and the first auxiliary phosphor 102RB. Connected to the second auxiliary inorganic light-emitting element 102GB. According to this manufacturing method, even when a poor phosphor is manufactured, the auxiliary phosphor 102B can be mounted instead of the poor phosphor, so even if a defect occurs during manufacturing, it can be set as A state that can be used appropriately. In addition, since the auxiliary phosphor 100B is provided with a plurality of kinds of auxiliary phosphors 102B that can emit light in different wavelength bands, one auxiliary phosphor 100B can be used to replace all kinds of phosphors 100, which can suppress The burden of dressing.

(Second Embodiment) Next, the second embodiment will be described. In the first embodiment, the single-color phosphor 100A is first mounted in the pixel Pix, and the defective single-color phosphor 100A is replaced with an auxiliary phosphor 100B. On the other hand, in the second embodiment, the auxiliary phosphor 100B is mounted in advance in all the pixels Pixa. In the second embodiment, descriptions of the parts that are common to the first embodiment are omitted.

Fig. 12 is a plan view showing a plurality of pixels in the second embodiment. As shown in FIG. 12, the display device 1a of the second embodiment has a plurality of pixels Pixa arranged in a matrix. The pixel Pixa includes a monochrome pixel 49A and an auxiliary pixel 49BB. More specifically, the pixel Pixa includes three monochromatic pixels 49A, that is, a first pixel 49R, a second pixel 49G, a third pixel 49B, and one auxiliary pixel 49BB. In other words, the pixel Pixa includes: three single-color phosphors 100A, namely, the first single-color phosphor 100RA, the second single-color phosphor 100GA, and the third single-color phosphor 100BA, and one auxiliary phosphor 100B.

Here, among the pixels Pixa, a pixel that has no defect in the monochromatic phosphor 100A is referred to as the pixel PixAa, and a pixel that has a defect in the monochromatic phosphor 100A is referred to as the pixel PixBa. Since the pixel PixAa has no defects in the monochromatic phosphor 100A, the first monochromatic phosphor 100RA, the second monochromatic phosphor 100GA, and the third monochromatic phosphor 100BA can emit light in each wavelength band. Therefore, all the auxiliary phosphors 102B (the first auxiliary phosphor 102RB, the second auxiliary phosphor 102GB, and the third auxiliary phosphor 102BB) contained in the auxiliary phosphor 100B of the pixel PixAa and the opposite cathode The electrode 90e becomes disconnected and becomes a state where it cannot emit light.

On the other hand, the pixel PixBa is defective in a part of the monochromatic phosphor 100A, in other words, at least one of the first monochromatic phosphor 100RA, the second monochromatic phosphor 100GA, and the third monochromatic phosphor 100BA The person becomes unable to emit light. Therefore, a part of the auxiliary inorganic light-emitting element 102B contained in the auxiliary phosphor 100B of the pixel PixBa, more specifically, the auxiliary inorganic light that emits light in the same wavelength band as the monochromatic phosphor 100A that cannot emit light The light-emitting element 102B is connected to the opposite cathode electrode 90e and becomes a state capable of emitting light. On the other hand, the auxiliary inorganic light-emitting element 102B that emits light in a wavelength band different from that of the monochromatic phosphor 100A in a non-luminous state of the pixel PixBa is disconnected from the counter cathode electrode 90e, and is in a non-luminous state. . In the following description, a case where the first single-color phosphor 100RA of the pixel PixBa becomes defective and becomes in a state where it cannot emit light as an example. In this case, the first auxiliary phosphor 102RB of the auxiliary phosphor 100B of the pixel PixBa becomes a state capable of emitting light, and the second auxiliary phosphor 102GB and the third auxiliary phosphor 102BB become unable to emit light. In addition, hereinafter, the single-color phosphor 100A that becomes defective is appropriately described as the defective inorganic light 100N.

In this way, in the second embodiment, three monochromatic phosphors 100A and one auxiliary phosphor 100B are provided in one pixel Pixa. Therefore, in the second embodiment, the wavelength band of the light emitted by the first auxiliary inorganic light emitting element 102RB, that is, the first wavelength band, follows the monochromatic phosphor included in the same pixel Pixa as the first auxiliary inorganic light emitting element 102RB. The wavelength bands of light emitted by 100A (first monochromatic phosphor 100RA) overlap. That is, in the second embodiment, in one pixel Pixa, the wavelength band of the light emitted by the auxiliary inorganic light emitting element 102B connected to the opposite cathode electrode 90e and in a state capable of emitting light is the same as that assumed to be included in the same pixel When the Pixa monochromatic phosphor 100A emits light, the wavelength bands of light overlap.

FIG. 13 is a schematic diagram illustrating the manufacturing method of the display device of the second embodiment. As shown in FIG. 13, in the manufacturing method of the display device 1a of the second embodiment, as shown in step S50, the array substrate 2 is formed, and the monochromatic inorganic light-emitting element 102A is formed on the array substrate 2. Specifically, the monochromatic inorganic light emitting element 102A formed on the formation substrate 200 is mounted on the array substrate 2. The mounting method of the monochromatic inorganic light-emitting element 102A on the array substrate 2 is the same as in the first embodiment. However, in the second embodiment, after all the single-color inorganic light-emitting elements 102A are mounted on the array substrate 2, the auxiliary inorganic light-emitting element 102B (auxiliary inorganic light-emitting element assembly 101B) is also mounted, so the single-color inorganic light-emitting element 102A is not mounted. The anode electrode 112 of the light-emitting element 102A remains.

Next, as shown in step S52, on the anode electrode 112 that is not equipped with the single-color phosphor 102A, an auxiliary phosphor assembly 101B (a set of all auxiliary phosphors 102B including one auxiliary phosphor 100B) is mounted body). In this way, the single-color inorganic light-emitting element 102A and the auxiliary inorganic light-emitting element 102B are formed on the array substrate 2.

Next, as shown in step S54, by connecting the inspection substrate 202 to the monochromatic inorganic light emitting element 102A on the array substrate 2, and performing a lighting inspection, the defect of the monochromatic inorganic light emitting element 102A, that is, the defect is detected Inorganic light-emitting element 102N. The detection method of the defective inorganic light-emitting element 102N is the same as that of the first embodiment. In addition, step S54 can be performed before step S52, that is, before the auxiliary inorganic light-emitting element assembly 101B is mounted.

Next, as shown in step S56, on the array substrate 2, the monochromatic phosphor 100A, the auxiliary phosphor 100B, the insulating film 70, the planarizing film 80, and the counter cathode electrode 90e are formed. Specifically, a cathode electrode 114 is formed on each of the monochromatic inorganic light-emitting element 102A and the auxiliary inorganic light-emitting element 102B. In this way, the monochromatic phosphor 100A and the auxiliary phosphor 100B are formed on the array substrate 2. Then, the insulating film 70 and the planarizing film 80 are filled in the space where the single-color phosphor 100A and the auxiliary phosphor 100B are not formed. Then, the opposite cathode electrode 90e is formed on the monochromatic phosphor 100A and the auxiliary phosphor 100B. Here, the opposite cathode electrode 90e is formed so as to be connected to all the single-color phosphors 100A and the auxiliary phosphor 100B. Although the second embodiment is different from the first embodiment in that the defective inorganic light-emitting element 102N remains and is not removed from the display device 1a, in the second embodiment, the defective inorganic light-emitting element 102N can also be removed from the display device 1a. .

After the monochromatic phosphor 100A and the auxiliary phosphor 100B are formed, the opposite cathode electrode 90e connected to the auxiliary phosphor 100B is removed. In the process of removing the opposite cathode electrode 90e, step S58A is performed for the pixel PixBa where the defective inorganic light-emitting element 102N is detected, and step S58B is performed for the pixel PixAa where the defective inorganic light-emitting element 102N is not detected.

First, step S58A will be described. In step S58A, a part of the opposite cathode electrode 90e connected to the auxiliary phosphor 100B contained in the pixel PixBa and a part of the cathode electrode 114 of the auxiliary phosphor 100B are removed. Specifically, the portion of the opposite cathode electrode 90e and the cathode electrode 114 connected to the second auxiliary phosphor 100B of the auxiliary phosphor 100B and the third auxiliary phosphor 102BB connected to the auxiliary phosphor 100B are removed. part. That is, it is assumed that the opposing cathode electrode 90e and the cathode electrode 114 are connected to the auxiliary inorganic light emitting element 102B that emits light in the same wavelength band as the light emitted when the defective inorganic light emitting element 102N is in a normal state. state. Furthermore, for the auxiliary inorganic light emitting element 102B that emits light in a wavelength band different from the light in the wavelength band emitted when the defective inorganic light emitting element 102N is in a normal state, the opposite cathode electrode 90e and the cathode electrode 114 are set to be disconnected state. The method of removing the opposite cathode electrode 90e and the cathode electrode 114 in step S58A is the same as in the first embodiment.

After step S58A is performed, as shown in step S60A, the space AR formed by removing a part of the opposite cathode electrode 90e and a part of the cathode electrode 114 is filled with the insulator 80B.

On the other hand, in step S58B, the counter cathode electrode 90e connected to the auxiliary phosphor 100B contained in the pixel PixAa and the cathode electrode 114 of the auxiliary phosphor 100B are removed. Specifically, the opposite cathode electrode 90e and the cathode electrode 114 of all the auxiliary phosphor elements 102B connected to the auxiliary phosphor 100B of the opposite cathode electrode 90e and the cathode electrode 114 are removed. That is, for all the auxiliary inorganic light emitting elements 102B of the auxiliary phosphor 100B, the opposite cathode electrode 90e and the cathode electrode 114 are set in a non-connected state. After step S58B is performed, as shown in step S60B, the space AR formed by removing the opposite cathode electrode 90e and the cathode electrode 114 is filled with the insulator 80B.

As described above, in the second embodiment, three monochromatic phosphors 100A and one auxiliary phosphor 100B are mounted in the pixel Pixa in advance. Therefore, even when one single-color phosphor 100A becomes defective, the auxiliary phosphor 100B can be replaced. Furthermore, by pre-installing the auxiliary phosphor 100B, there is no need to remove the defective phosphor 100N and replace it with the auxiliary phosphor 100B, thereby reducing the work load.

Also, as in the second embodiment, in the case where three monochromatic phosphors 100A and one auxiliary phosphor 100B are mounted in the pixel Pixa, in the case where the monochromatic phosphor 100A can emit light without defects Or in the case where the monochromatic phosphor 100A can emit light but the light intensity is low due to poor connection, etc., the auxiliary phosphor 100B can also be made to emit light. In this case, the auxiliary phosphor 100B can be used to enhance the intensity of the light emitted by a single monochromatic phosphor 100A. That is, by making three monochromatic phosphors 100A and one auxiliary phosphor 100B emit light in one pixel Pixa, the intensity of the light in the wavelength band emitted by one monochromatic phosphor 100A can be increased. The following describes the driving method for this situation. Hereinafter, a case where the auxiliary phosphor 100B, that is, the auxiliary pixel 49BB emits light in the first wavelength band, which is red light here, will be described as an example.

Fig. 14 is a flowchart for explaining the method of setting the output grayscale value in the second embodiment. As shown in FIG. 14, first, the signal processing circuit 160 captures a 1-frame image (step S70). Specifically, the buffer 166 captures the image signal Vsig of 1 frame, and memorizes the input grayscale values SiR, SiG, and SiB corresponding to each of red, green, and blue.

The first processing circuit 162 determines whether the input gray scale value SiR is greater than 0 for each pixel Pix (step S72). In other words, it is judged whether there is a red display for each pixel Pixa. When the input gray scale value SiR is greater than 0 (step S72; Yes), the first processing circuit 162 compares the input gray scale value SiR with the threshold value Lth (step S74). Although the value of the threshold Lth is preset, it can be set arbitrarily. When the input gray scale value SiR is below the threshold value Lth (step S74; Yes), the first processing circuit 162 does not light up the first monochromatic phosphor 100RA (first pixel 49R), and makes the auxiliary phosphor 100B (the auxiliary pixel 49BB) lights up (step S76). Specifically, the first processing circuit 162 sets the output gray scale value SoR, and lights the auxiliary phosphor 100B with the set output gray scale value SoR.

When the input gray scale value SiR is greater than the threshold value Lth (step S74; No), the first processing circuit 162 determines whether the driving current value is less than the current threshold value Ith (step S78). The driving current value is the current value flowing in the auxiliary phosphor 100B assuming that the auxiliary phosphor 100B is lit by the output gray scale value SoR. The first processing circuit 162 calculates the drive current value based on the output gray scale value SoR. In addition, although the current threshold Ith value is preset, it can be set arbitrarily. When the driving current value is less than the current threshold value Ith (step S78; Yes), the first processing circuit 162 lights up both the first monochromatic phosphor 100RA and the auxiliary phosphor 100B (step S79) . Specifically, the first processing circuit 162 sets the output gray scale values SoR1a and SoR2a, uses the set output gray scale value SoR1a to light up the auxiliary phosphor 100B, and uses the set output gray scale value SoR2a to make the first monochromatic inorganic luminescence Body 100RA lights up. The first processing circuit 162, for example, sets the output gray scale value SoR1amSoR2a so that the total value of the output gray scale values SoR1a and SoR2a becomes the output gray scale value SoR.

In the case where the driving current value is greater than the current threshold Ith (step S78; No), the first processing circuit 162 turns on the first monochromatic phosphor 100RA, auxiliary phosphor 100B, and adjacent phosphors ( Step S80). In the adjacent phosphor 100 of the phosphor 100 of the pixel Pixa adjacent to the pixel Pixa including the auxiliary phosphor 100B, the phosphor 100 emits light in the same wavelength band as the light emitted by the auxiliary phosphor 100B. In step S78, the first processing circuit 162 sets the output grayscale values SoR1b, SoR2b, SoR3b, uses the set output grayscale value SoR1b to light up the auxiliary phosphor 100B, and uses the set output grayscale value SoR2b to make the first single The color phosphor 100RA is lit, and the adjacent phosphor is lit with the set output gray scale value SoR3b. The first processing circuit 162, for example, sets the output gray scale values SoR1b, SoR2b, and SoR3b so that the total value of the output gray scale values SoR1b, SoR2b, and SoR3b becomes the output gray scale value SoR.

In addition, when the input gray scale value SiR is 0 (step S72; No), the first processing circuit 162 sets the gray scale value 0 as the output gray scale value SoR, and does not light up the first monochromatic phosphor 100RA, and The auxiliary phosphor 100B (step S82).

In addition, with regard to other functions and effects brought about by the aspects described in this embodiment, if they are clarified based on the description in this specification, or those that can be appropriately thought of by those familiar with the technology, they should be understood as being related The effect brought by the present invention.

1,1a: display device 2: Array substrate 10: substrate 10a: side 1 10b: Side 2 12: Drive circuit 20: Primer 21: The first gate electrode 24, 29, 35, 42, 45: insulating film 25: Semiconductor layer 27: Channel area 31: 2nd gate electrode 31a: gate line 41d: Drain electrode 41s: source electrode 43d: Drain connection wiring 43s: Source connection wiring 49: pixels 49A: Monochrome pixels 49B: 3rd pixel 49BB: auxiliary pixel 49G: 2nd pixel 49R: 1st pixel 50e: opposite anode electrode 50f: Connection layer 52: Connect the conductive part 60: Cathode wiring 66: insulating film 70: Insulating film 80: Flattening film 80B: Insulator 90e: opposite cathode electrode 92: Hood 100: phosphor 100A: Monochrome phosphor 100B: auxiliary phosphor 100BA: The third monochromatic phosphor 100GA: The second monochromatic phosphor 100N: Poor inorganic luminous body 100RA: The first monochromatic phosphor 101B: Auxiliary inorganic light-emitting element assembly 102: Inorganic light-emitting element 102A: Monochromatic inorganic light-emitting element 102B: Auxiliary inorganic light-emitting element 102BA: The third monochromatic inorganic light-emitting element 102BB: The third auxiliary inorganic light-emitting element 102GA: The second monochromatic inorganic light-emitting element 102GB: 2nd auxiliary inorganic light-emitting element / 2nd inorganic light-emitting element 102N: Poor inorganic light-emitting element 102RA: The first monochromatic inorganic light-emitting element 102RB: The first auxiliary inorganic light-emitting element 103BB: Zone 3 103GB: Zone 2/Region 103RB: 1st area/area 104, 104B: n-type cladding 106, 106B: p-type cladding 108, 108B: luminescent layer 109: protective layer 112: anode electrode 114: Cathode electrode 160: signal processing circuit 162: The first processing circuit 164: Memory 166: Buffer 200: Form the substrate 202: Inspection substrate 202A: Conductive part 202B: Base 210: Driver IC AA: display area AR: Space BCT: Light-emitting control transistor BG: Luminous control scan line CH1: contact hole Cs1: hold capacitance/capacitance Cs2: Capacitance DB, DG, DR: diameter DRT: drive transistor Dx: 1st direction Dy: 2nd direction Dz: 3rd direction GA: Surrounding area IG: Initialize control scan line IST: initialize transistor L1: anode power cord L2: Video signal line L3: Reset signal line L4: Initialization signal line L10: Cathode power cord LI, LIa: Laser light PICA: pixel circuit Pix, Pixa, PixA, PixAa, PixB, PixBa: pixels PVDD: anode power supply potential PVSS: Cathode power supply potential RG: reset control scan line RST: reset transistor SG: write control scan line SiB, SiG, SiR: input grayscale value SoB, SoGb, SoR: output grayscale value SST: write transistor Tr, TrC: Transistor Vbg: luminous control signal Vig: Initialization control signal Vini: Initialization potential Vrg: reset control signal Vrst: reset power supply potential Vsg: write control signal Vsig: video signal

Fig. 1 is a plan view showing a configuration example of the display device of the first embodiment. Fig. 2 is a plan view showing a plurality of pixels in the first embodiment. FIG. 3 is a circuit diagram showing a configuration example of a pixel circuit of a display device. FIG. 4 is a circuit diagram showing a configuration example of a pixel circuit of a display device. Fig. 5 is a cross-sectional view taken along the line V-V' of Fig. 1; Fig. 6 is a cross-sectional view showing a configuration example of the monochromatic phosphor of this embodiment. Fig. 7 is a cross-sectional view showing a configuration example of the auxiliary phosphor of this embodiment. Fig. 8 is a plan view showing a configuration example of the auxiliary phosphor of this embodiment. FIG. 9 is a schematic diagram illustrating the manufacturing method of the display device of the first embodiment. FIG. 10 is a block diagram schematically showing the structure of the signal processing circuit. FIG. 11 is a flowchart for explaining the method of setting the output grayscale value in the first embodiment. Fig. 12 is a plan view showing a plurality of pixels in the second embodiment. FIG. 13 is a schematic diagram illustrating the manufacturing method of the display device of the second embodiment. Fig. 14 is a flowchart for explaining the method of setting the output grayscale value in the second embodiment.

1: display device

49A: Monochrome pixels

49B: 3rd pixel

49BB: auxiliary pixel

49G: 2nd pixel

49R: 1st pixel

100: phosphor

100A: Monochrome phosphor

100B: auxiliary phosphor

100BA: The third monochromatic phosphor

100GA: The second monochromatic phosphor

100RA: The first monochromatic phosphor

102: Inorganic light-emitting element

102A: Monochromatic inorganic light-emitting element

102B: Auxiliary inorganic light-emitting element

102BA: The third monochromatic inorganic light-emitting element

102BB: The third auxiliary inorganic light-emitting element

102GA: The second monochromatic inorganic light-emitting element

102GB: 2nd auxiliary inorganic light-emitting element / 2nd inorganic light-emitting element

102RA: The first monochromatic inorganic light-emitting element

102RB: The first auxiliary inorganic light-emitting element

Dx: 1st direction

Dy: 2nd direction

Dz: 3rd direction

Pix, PixA, PixB: pixels

Claims (10)

A display device comprising: a plurality of phosphors arranged in a matrix, and a counter electrode connected to the plurality of phosphors; and The plurality of aforementioned phosphors include: Monochromatic phosphor, which can emit light in a specific wavelength band; and Auxiliary inorganic light-emitting body, which includes: a first auxiliary inorganic light emitting element that can emit light in the first wavelength band when current is supplied, and a second auxiliary element that can emit light in the second wavelength band when current is supplied An inorganic light-emitting element, and an electrode connected to the first auxiliary inorganic light-emitting element and the second auxiliary inorganic light-emitting element; and The counter electrode is connected to the monochromatic phosphor and the first auxiliary inorganic light-emitting element, and is not connected to the second auxiliary inorganic light-emitting element. The display device of claim 1, wherein the first wavelength band is different from the wavelength band of light emitted by the monochromatic phosphor included in the same pixel. The display device of claim 1, wherein the first wavelength band overlaps with the wavelength band of light emitted by the monochromatic phosphor included in the same pixel. The display device of claim 1, wherein the second wavelength band overlaps with the wavelength band of light emitted by the monochromatic phosphor included in the same pixel. The display device of claim 1, wherein the first auxiliary inorganic light-emitting element and the second auxiliary inorganic light-emitting element are columnar, and the width of the first auxiliary inorganic light-emitting element is the same as the width of the second auxiliary inorganic light-emitting element when viewed from the axial direction. The width of the light-emitting element is different. The display device of claim 1, wherein when viewed from the direction in which the phosphor and the counter electrode are arranged, the area where one auxiliary phosphor is provided is compared to the area where one single-color phosphor is provided Wider. The display device of claim 1, wherein, when viewed from the direction in which the phosphor and the counter electrode are arranged, the area of the region where the first auxiliary phosphor is provided and the second auxiliary phosphor is provided The area of the area is different. The display device of claim 1, wherein the auxiliary phosphor further includes a third auxiliary phosphor, which can emit light in the third wavelength band when current is supplied; and The counter electrode is not connected to the third auxiliary inorganic light emitting element. The display device of claim 8, wherein the inorganic light-emitting body includes: the monochromatic inorganic light-emitting body that can emit light in the second wavelength band, and the monochromatic inorganic light-emitting body that can emit light in the third wavelength band. A method for manufacturing a display device, which includes: A step of forming a monochromatic phosphor, which forms a monochromatic phosphor that can emit light in a specific wavelength band; An auxiliary phosphor forming step, which forms an auxiliary phosphor, the auxiliary phosphor having: a first auxiliary phosphor that can emit light in the first wavelength band when current is supplied, and when current is supplied A second auxiliary inorganic light emitting element capable of emitting light in the second wavelength band, and an electrode connected to the first auxiliary inorganic light emitting element and the second auxiliary inorganic light emitting element; and The counter electrode forming step is to form a counter electrode connected to the monochromatic phosphor and the first auxiliary phosphor, but not to the second auxiliary phosphor.

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