Display device

Abstract

A display device includes: a blue light emitting element configured to emit blue light; a red light emitting element configured to emit red light; and a green light emitting element configured to emit green light. The blue light emitting element may include: a first light emitting diode configured to emit light having a maximum intensity at a wavelength shorter than a blue wavelength; and a blue filter configured to transmit light having a blue wavelength.

Description

Technical Field

[0001] The present disclosure relates to a display device, and more particularly, to a display device including a light emitting diode. Background Art

[0002] In the related art, a display device refers to an output device that displays visual information converted from received or stored image information to a user, and has been widely used in various application fields, such as a single home or a business place.

[0003] For example, the display device may be a monitoring device connected to a personal computer or a server computer, a portable computer device, a navigation device, a television (TV), an Internet Protocol television (IPTV), a portable terminal (such as a smart phone, a tablet personal computer (PC), a personal digital assistant (PDA), or a cellular phone), or various display devices for playing advertisements or movies in the industrial field or various types of audio / video systems.

[0004] The display device may display images using various types of display panels. For example, the display device may include a light emitting diode (LED) panel, an organic light emitting diode (OLED) panel, a liquid crystal display (LCD) panel, and the like.

[0005] Among various display panels, micro LED panels using light emitting diodes having a size of 100 um (micrometer) × 100 um or less have recently been developed. Summary of the invention

[0006]

Technical issues

[0007] An aspect of the present disclosure is to provide a display device including a plurality of micro LEDs.

[0008] Another aspect of the present disclosure is to minimize a wavelength deviation of light emitted from a plurality of pixels included in a display device.

[0009] Another aspect of the present disclosure is to minimize wavelength deviation of light emitted from a plurality of micro LEDs included in a display device.

[0010]

Technical solution

[0011] One aspect of the present disclosure provides a display device, including: a blue emitting element configured to emit blue; a red light emitting element configured to emit red light; and a green light emitting element configured to emit green light. The blue light emitting element may include: a first light emitting diode configured to emit light having a maximum intensity at a wavelength shorter than a blue wavelength; and a blue filter configured to transmit light having a blue wavelength.

[0012] The first light emitting diode may be configured to emit light having a maximum intensity at any one of wavelengths 15 nm (nanometers) to 25 nm smaller than a blue wavelength.

[0013] The first light emitting diode may be configured to emit light having a maximum intensity at any one wavelength of 440 nm to 450 nm. The blue filter may be configured to block light having a wavelength shorter than 465 nm.

[0014] The first light emitting diode may be configured to emit light having a maximum intensity at any one wavelength of 440 nm to 450 nm. The transmittance of the blue filter may be configured to decrease rapidly at 465 nm.

[0015] The first light emitting diode may be configured to emit light having a maximum intensity at any one wavelength of 440 nm to 450 nm. The blocking characteristic curve of the blue filter may be configured to intersect a spectrum curve of the first light emitting diode at 465 nm.

[0016] The blue light emitting element may further include a transparent resin layer disposed between the first light emitting diode and the blue filter and configured to transmit light emitted from the first light emitting diode.

[0017] The blue light emitting element may further include a yellow quantum dot material layer arranged between the first light emitting diode and the blue filter, the yellow quantum dot material layer being configured to absorb light emitted from the first light emitting diode and emit light having a wavelength shorter than the blue wavelength, light having a red wavelength, and light having a green wavelength.

[0018] The display device may further include: a driving circuit configured to provide a driving current to the blue light emitting element; and a compensation circuit for compensating for brightness of light emitted from the blue light emitting element.

[0019] The compensation circuit may be configured to control the driving current so that light of a predetermined brightness is emitted from the blue light emitting element.

[0020] The red light emitting element may include a second light emitting diode configured to emit light having a maximum intensity at a wavelength shorter than a blue wavelength; and a red quantum dot material layer configured to absorb light emitted from the second light emitting diode and emit light having a red wavelength.

[0021] The red light emitting element may include a second light emitting diode configured to emit light having a maximum intensity at a wavelength shorter than a blue wavelength; and a yellow quantum dot material layer configured to absorb light emitted from the second light emitting diode and emit light having a wavelength shorter than the blue wavelength, light having a red wavelength, and light having a green wavelength; the red filter is configured to allow light having a red wavelength to pass through.

[0022] The red light emitting element may include a second light emitting diode configured to emit light having a maximum intensity at a wavelength shorter than a red wavelength; and the red filter configured to block light having a wavelength shorter than a red wavelength.

[0023] The green light emitting element may include a third light emitting diode configured to emit light having a maximum intensity at a wavelength shorter than the blue wavelength; and a green quantum dot material layer configured to absorb light emitted from the third light emitting diode and emit light having a green wavelength.

[0024] The green light emitting element may include a third light emitting diode, which is configured to emit light having a maximum intensity at a wavelength shorter than the blue wavelength; and a yellow quantum dot material layer, which is configured to absorb the light emitted from the third light emitting diode and emit light having a wavelength shorter than the blue wavelength, light having a red wavelength, and light having a green wavelength; and a green filter, which is configured to allow light having a green wavelength to pass.

[0025] The green light emitting element may include a second light emitting diode configured to emit light having a maximum intensity at a wavelength shorter than a green wavelength; and a green filter configured to block light having a wavelength shorter than the green wavelength.

[0026] Another aspect of the present disclosure provides a display device, comprising: a first light emitting element configured to emit light having a first wavelength; a second light emitting element configured to emit light having a second wavelength; and a third light emitting element configured to emit light having a third wavelength. The first light emitting element may include: a first light emitting diode configured to emit light having a maximum intensity at a wavelength shorter than the first wavelength; and a first filter configured to transmit light having the first wavelength.

[0027] The first light emitting diode may be configured to emit light having a maximum intensity at any one wavelength of 440 nm to 450 nm. The first optical filter may be configured to block light having a wavelength shorter than 465 nm.

[0028] The first light emitting element may further include a first quantum dot material layer configured to absorb light emitted from the first light emitting diode and emit light having a wavelength shorter than the first wavelength, light having a second wavelength, and light having a third wavelength.

[0029] The second light emitting element may include a second light emitting diode configured to emit light having a maximum intensity at a wavelength shorter than the first wavelength; a second quantum dot material layer configured to absorb light emitted from the second light emitting diode and emit light having a wavelength shorter than the first wavelength and light having a second wavelength; and a second filter configured to block light having a wavelength shorter than the first wavelength and pass light having the second wavelength. In addition, the third light emitting element may include a third light emitting diode configured to emit light having a maximum intensity at a wavelength shorter than the first wavelength; a third quantum dot material layer configured to absorb light emitted from the third light emitting diode and emit light having a wavelength shorter than the first wavelength and light having a third wavelength; and a third filter configured to block light having a wavelength shorter than the first wavelength and pass light having the third wavelength.

[0030] The second light emitting element may include a second light emitting diode configured to emit light having a maximum intensity at a wavelength shorter than the first wavelength; a second quantum dot material layer configured to absorb light emitted from the second light emitting diode and emit light having a wavelength shorter than the first wavelength, light having a second wavelength, and light having a third wavelength; a second optical filter configured to block light having a wavelength shorter than the first wavelength and light having the third wavelength, and pass light having the second wavelength. In addition, the third light emitting element may include a third light emitting diode configured to emit light having a maximum intensity at a wavelength shorter than the first wavelength; a third quantum dot material layer configured to absorb light emitted from the third light emitting diode and emit light having a wavelength shorter than the first wavelength, light having a second wavelength, and light having a third wavelength; and a third optical filter configured to block light having a wavelength shorter than the first wavelength and light having the second wavelength, and pass light having the third wavelength.

[0031]

Beneficial Effects

[0032] According to an aspect of an embodiment, a display device including a plurality of micro LEDs may be provided.

[0033] According to another aspect of the embodiment, a wavelength deviation of light emitted from a plurality of pixels included in a display device may be minimized.

[0034] According to another aspect of the embodiment, a wavelength deviation of light emitted from a plurality of micro LEDs included in a display device may be minimized. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a view showing the appearance of a display device according to the embodiment.

[0036] Figure 2is an exploded view showing a display device according to an embodiment.

[0037] Figure 3 is a view showing a light emitting diode panel and a driver IC included in a display device according to an embodiment.

[0038] Figure 4 is a view showing an equivalent circuit of a light emitting diode panel included in a display device according to an embodiment.

[0039] Figure 5 is a view showing an example of a light emitting element included in a display device according to an embodiment.

[0040] Figure 6 It is shown Figure 5 A view showing a structure of a red light emitting element included in a display device and a spectrum of light output from the red light emitting element.

[0041] Figure 7 It is shown Figure 5 A diagram showing a structure of a green light-emitting element included in a display device and a spectrum of light output from the green light-emitting element.

[0042] Figure 8 It is shown Figure 5 A diagram showing a structure of a blue light emitting element included in a display device and a spectrum of light output from the blue light emitting element.

[0043] Fig. 9 and Fig.10 It is shown from Figure 5 A diagram showing wavelength deviation of light output by a blue light emitting diode included in a display device is shown.

[0044] Fig.11 , Fig.12 and Fig.13 It is shown from Figure 5 A diagram showing a wavelength deviation of light output by a blue light emitting element included in a display device.

[0045] Fig.14 It shows the manufacturing Figure 5 A view showing a process of including a blue light emitting element in a display device.

[0046] Fig.15 It shows the manufacturing Figure 5 A view of the process of a red light emitting element is shown in FIG.

[0047] Fig.16 It shows the manufacturing Figure 5 A view of the process of a green light emitting element is shown in FIG.

[0048] Fig.17is a view showing another example of a light emitting element included in a display device according to an embodiment.

[0049] Fig.18 It is shown Fig.17 A view showing a structure of a red light emitting element included in a display device and a spectrum of light output from the red light emitting element.

[0050] Fig.19 It is shown Fig.17 A view showing a structure of a green light emitting element included in a display device and a spectrum of light output from the green light emitting element.

[0051] Fig. 20 It is shown Fig.17 A view showing a structure of a blue light emitting element included in a display device and a spectrum of light output from the blue light emitting element.

[0052] Fig.21 It shows the manufacturing Fig.17 A view of the process of a red light emitting element, a green light emitting element, and a blue light emitting element is shown.

[0053] Fig. 22 is a view showing another example of a light emitting element included in a display device according to an embodiment.

[0054] Fig.23 It is shown Fig. 22 A diagram showing a structure of a red light emitting element included in a display device and a spectrum of light output from the red light emitting element.

[0055] Fig.24 It is shown Fig. 22 A diagram showing a structure of a green light-emitting element included in a display device and a spectrum of light output from the green light-emitting element.

[0056] Fig.25 It is shown Fig. 22 A diagram showing a structure of a blue light emitting element included in a display device and a spectrum of light output from the blue light emitting element. DETAILED DESCRIPTION

[0057] Throughout the specification, identical reference numerals refer to identical elements.All elements of the disclosed embodiments are not described, and the description of being known in the art or overlapping each other in the embodiments will be omitted.The term used throughout the specification, such as "~part", "~module", "~piece", "~block" etc., can be realized with software and / or hardware, and multiple "~part", "~module", "~piece" or "~block" can be realized in a single element, or a single "~part", "~module", "~piece" or "~block" can include multiple elements.

[0058] It will be understood that when an element is referred to as being “connected” to another element, it may be directly or indirectly connected to the other element, where the indirect connection includes “connection” via a wireless communication network.

[0059] In addition, when a part “includes” or “comprises” an element, unless there is a specific description contrary to it, the part may further include other elements, rather than excluding other elements.

[0060] In addition, when it is described that a layer is 'on' another layer or a substrate, the layer may be directly on the other layer or the substrate, or a third layer may be interposed therebetween.

[0061] It will be understood that although the terms first, second, third, etc. may be used herein to describe various elements, they should not be limited by these terms. These terms are only used to distinguish one element from another.

[0062] As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0063] For ease of description, identification codes are used but are not intended to indicate the order of each step. Unless the context clearly indicates otherwise, each step may be implemented in an order different from the order shown.

[0064] The expression “at least one of A, B, and C” should be interpreted as including only A, only B, only C, both A and B, both B and C, both C and A, or all of A, B, and C.

[0065] Hereinafter, the operating principles and embodiments of the present disclosure will be described with reference to the accompanying drawings.

[0066] Figure 1 is a view showing the appearance of a display device according to the embodiment.

[0067] The display device 100 is a device capable of processing an image signal received from the outside (eg, an external image source) and visually displaying the processed image. Figure 1 As shown, the display device 100 may be implemented as a TV, but the embodiment of the display device 100 is not limited thereto. For example, the display device 100 may be implemented as a monitor of a computer, or may be included in a navigation terminal device or various portable terminal devices. Here, the portable terminal device may be a desktop computer, a laptop computer, a smart phone, a tablet personal computer (PC), a wearable computing device, or a personal digital assistant (PDA).

[0068] In addition, the display device 100 may be a large display (LFD) installed outdoors, such as on a building roof or a bus stop. Outdoor is not necessarily limited to the outside, but should be understood as a concept including places where a large number of people can enter and exit, even including subway stations, shopping malls, cinemas, companies, stores, etc.

[0069] The display device 100 can receive video signals and audio signals from various content sources, and can output video and audio corresponding to the video signals and audio signals. For example, the display device 100 can receive television broadcast content through a broadcast receiving antenna or cable, receive content from a content reproducing device, or receive content from a content providing server of a content provider.

[0070] like Figure 1 As shown, the display device 100 may include: a main body 101 accommodating a plurality of components for displaying an image I; and a screen S disposed on one surface of the main body 101 to display the image I.

[0071] The body 101 may form an exterior appearance of the display device 100 , and components for displaying an image I through the display device 100 may be disposed inside the body 101 . Figure 1 The main body 101 shown may be in the form of a flat plate, but the shape of the main body 101 is not limited to Figure 1 For example, the main body 101 may have a shape in which both left and right ends protrude forward and a central portion is bent into a concave shape.

[0072] The screen S may be formed on the front surface of the body 101, and the screen S may display the image I as visual information. For example, a still image or a moving image may be displayed on the screen S, and a two-dimensional plane image or a three-dimensional stereoscopic image may be displayed.

[0073] A plurality of pixels P may be formed on the screen S, and an image I displayed on the screen S may be formed by a combination of light emitted from the plurality of pixels P. For example, a single image I may be formed on the screen S by combining light emitted from the plurality of pixels P with a mosaic.

[0074] Each of the plurality of pixels P may emit light of various brightness and various colors.

[0075] Each of the plurality of pixels P may include a structure capable of directly emitting light so as to emit light of various brightnesses (eg, an organic light emitting diode), or a structure capable of transmitting or blocking light emitted by a backlight unit or the like (eg, a liquid crystal panel).

[0076] In order to emit light of various colors, each of the plurality of pixels P may include a sub-pixel P R , P G and PB .

[0077] Sub-pixel P R , P G and P B Can emit light. Red sub-pixel P R Can emit red light, green sub-pixel P G Can emit green light, and the blue sub-pixel P B For example, the red sub-pixel P R The red light having a wavelength of about 620nm (nanometer, one billionth of a meter) to 750nm can be emitted, and the green sub-pixel P G Green light having a wavelength of about 495 nm to 570 nm may be emitted, and the blue sub-pixel P B Blue light having a wavelength of approximately 450 nm to 495 nm may be emitted.

[0078] Through the red sub-pixel P R The red and green sub-pixels P G The green and blue sub-pixels P B Each of the multiple pixels P can emit light of various brightness and various colors.

[0079] Can be Figure 1 The screen S is set in the flat plate shape shown in the figure, however, the shape of the screen S is not limited to Figure 1 The shape shown. It can be set to a shape in which both ends protrude forward and the central part is bent to be concave according to the shape of the main body 101.

[0080] The display device 100 may include various types of display panels for displaying images. For example, the display device 100 may include a light-emitting display panel for displaying images using a self-luminous element. The light-emitting display panel may include a light-emitting diode (LED) panel or an organic light-emitting diode (OLED) panel. In addition, the display device 100 may include a non-luminescent display panel for displaying an image by passing or blocking light emitted from a light source (backlight unit). The non-luminescent display panel may include a liquid crystal display (LCD) panel.

[0081] Hereinafter, a display device 100 including an LED panel is described.

[0082] Figure 2 is an exploded view showing a display device according to an embodiment.

[0083] like Figure 2 As shown, various components for generating an image I on a screen S may be provided in the main body 101 .

[0084] For example, the main body 101 may include: an LED panel 103 for emitting light forward to generate an image, a control component 106 configured to control the operation of the LED panel 103, a power supply component 107 configured to supply power to the LED panel 103 and the control component 106, a base frame 108 for supporting / fixing the control component 106 and the power supply component 107, and a frame 102 and a back cover for preventing the LED panel 103, the control component 106 and the power supply component 107 from being exposed to the outside.

[0085] The light emitting diode panel 103 may include a plurality of light emitting elements 103a, and the plurality of light emitting elements 103a may each include a light emitting diode. A light emitting diode may refer to a semiconductor element that emits light of a predetermined wavelength when powered. A light emitting diode has the same polarity as a normal diode, and when a voltage is applied between a cathode and an anode, a current flowing through the light emitting diode flows and emits light. The light emitting diode may have various sizes, and a light emitting diode having a size of 100 μm (micrometer) × 100 μm or less may be referred to as a micro light emitting diode. The light emitting diode panel 103 may include, for example, a micro light emitting diode.

[0086] Each of the plurality of light emitting elements 103a may emit light of various colors and various brightnesses. The light emitting diode included in each of the plurality of light emitting elements 103a may emit light of different wavelengths (different colors) according to the constituent materials. For example, a light emitting diode including aluminum gallium arsenide (AlGaAs), gallium arsenide phosphide (GaAsP), and gallium phosphide (GaP) may emit red light having a wavelength of about 620nm to 750nm, a light emitting diode indium gallium nitride (InGaN) may emit green light having a wavelength of about 495nm to 570nm, and a light emitting diode including gallium nitride (GaN) may emit blue light having a wavelength of about 450nm to 495nm.

[0087] In addition, the plurality of light emitting elements 103a may emit light of different intensities according to the magnitude of the supplied current. As the supplied driving current increases, the light emitting diode included in each of the plurality of light emitting elements 103a may emit light with stronger intensity.

[0088] An image may be formed by combining the light emitted from each of the plurality of light emitting elements 103a. For example, an image may be formed by a combination of red light emitted from a red light emitting diode, green light emitted from a green light emitting diode, and blue light emitted from a blue light emitting diode.

[0089] The front surface (surface on which light is emitted) of the light emitting diode panel 103 may form the screen S of the above-mentioned display device 100, and each of the plurality of light emitting elements 103a may form a pixel P or the above-mentioned sub-pixel P.R , P G and P B .

[0090] On one side of the LED panel 103 , a cable 103 b for transmitting image data to the LED panel 103 and a display driver integrated circuit (DDI) 104 (hereinafter referred to as “driver IC”) for processing digital image data and outputting an analog image signal may be provided.

[0091] The cable 103b may be electrically connected between the control component 106 and the power component 107 and the driver IC 104, and may also be electrically connected between the driver IC 104 and the light emitting diode panel 103. The cable 103b may include a flexible flat cable or a thin film cable that can be bent.

[0092] The driver IC 104 may receive image data and power from the control component 106 and the power supply component 107 through the cable 103 b , and may provide an image signal and a driving current to the light emitting diode panel 103 through the cable 103 b .

[0093] The cable 103b and the driver IC 104 may be integrally implemented as a film cable, a chip on film (COF), a packet carrier (TCP), etc. In other words, the driver IC 104 may be arranged on the cable 103b. However, the present disclosure is not limited thereto, and the driver IC 104 may be arranged on the light emitting diode panel 103 or the control component 106.

[0094] The control component 106 may include a control circuit that controls the operation of the LED panel 103. The control circuit may process image data received from an external content source and transmit the image data to the LED panel 103 so that the plurality of light emitting elements 103a emit light having different colors and different brightness.

[0095] The power supply assembly 107 may supply power to the light emitting diode panel 103 so that the plurality of light emitting elements 103a emit light having different colors and different brightness.

[0096] The control component 106 and the power supply component 107 can be implemented with a printed circuit board and various circuits mounted on the printed circuit board. For example, the power supply circuit may include a capacitor, a coil, a resistor element, a microprocessor, etc., and a power supply circuit board on which they are mounted. In addition, the control circuit may include a memory, a microprocessor, and a control circuit board on which the memory and the microprocessor are mounted.

[0097] Figure 3 is a view showing a light emitting diode panel and a driver IC included in a display device according to an embodiment, and Figure 4 is a diagram illustrating an equivalent circuit of a light emitting diode panel included in a display device according to an embodiment.

[0098] like Figure 3 to Figure 4 As shown, the display device 100 may include a data driver 104 a , a scan driver 104 b , and a light emitting diode panel 103 .

[0099] The light emitting diode panel 103 may include a plurality of pixels P, and each of the plurality of pixels P may include a red sub-pixel P R , green sub-pixel P G and blue sub-pixel P B .

[0100] Multiple sub-pixels P R , P G and P B The sub-pixels P may be arranged two-dimensionally on the light emitting diode panel 103. For example, R , P G and P B The sub-pixels P may be arranged in a matrix on the light emitting diode panel 103. In other words, the plurality of sub-pixels P R , P G and P B Can be arranged in rows and columns.

[0101] In multiple sub-pixels P R , P G and P B Multiple data lines D are set between 1 , D 2 and D 3 And multiple scan lines S 1 and S 2 . Multiple scan lines S 1 and S 2 can be connected to the scan driver 104b, and a plurality of data lines D 1 , D 2 and D 3 Can be connected to data driver 104a.

[0102] The data driver 104a may receive red / green / blue image data (hereinafter referred to as "RGB image data") and a data control signal from the control circuit of the control component 106, and may output the RGB image data to the light-emitting diode panel 103 according to the data control signal. In particular, the data driver 104a may receive digital RGB image data, convert the digital RGB image data into analog RGB image signals, and output the analog RGB image signals to the light-emitting diode panel 103.

[0103] Each of the plurality of outputs provided in the data driver 104a may be connected to a plurality of data lines D of the light emitting diode panel 103. 1 , D 2 and D 3 The data driver 104a can transmit RGB image signals through a plurality of data lines D 1 , D 2 and D 3 Output to multiple sub-pixels P R , P G and P B For example, the data driver 104a may simultaneously output RGB image signals to a plurality of sub-pixels P included in a row on the light emitting diode panel 103. R , P G and P B Each of the .

[0104] The scan driver 104b may receive a scan control signal from the control circuit of the control component 106, and may activate a plurality of sub-pixels P included in any one of the plurality of rows according to the scan control signal. R , P G and P B For example, the scan driver 104b can control the scan control signal to the plurality of scan lines S 1 and S 2 Any one of the output activation signals.

[0105] The scan driver 104b can select a plurality of scan lines S 1 and S 2 any one of the above, so as to provide an RGB image to a plurality of sub-pixels P arranged in a matrix form. R , P G and P B The sub-pixel P of the appropriate row in R , P G and P B In addition, the data driver 104a can be configured to receive the data through a plurality of data lines D 1 , D 2 and D 3 The RGB image signals are outputted by the data driver 104a, and the RGB image signals outputted by the data driver 104a may be supplied to the sub-pixels P belonging to the row selected by the scan driver 104b. R , P G and P B .

[0106] In this way, the data driver 104a and the scan driver 104b can sequentially provide RGB image signals to the plurality of sub-pixels P included in the light emitting diode panel 103. R , P Gand P B .

[0107] Multiple sub-pixels P R , P G and P B Each of may include a scanning transistor 201 , 301 , and 401 , a driving transistor 202 , 302 , and 402 , a storage capacitor 203 , 303 , and 403 , and a light emitting element 200 , 300 , and 400 .

[0108] The scanning transistors 201, 301 and 401 may be thin film transistors (TFTs) including a control terminal (gate) T1 and first and second input / output terminals (source, drain) T2 and T3. The scanning transistors 201, 301 and 401 may allow current to flow between the first and second input / output terminals T2 and T3 (turn on) or may prevent current from flowing between the first and second input / output terminals T2 and T3 (turn off) according to a control signal input to the control terminal T1.

[0109] The scanning transistors 201, 301, and 401 may be turned on or off according to a scanning control signal output from the scanning driver 104b. For example, the control terminal T1 of the scanning transistors 201, 301, and 401 may be connected to the scanning line S 1 and S 2 , and the first input / output terminal T2 of the scanning transistors 201, 301 and 401 can be connected to the data line D 1 , D 2 and D 3 .

[0110] When receiving an activation signal to the control terminal T1 from the scan driver 104b, the scan transistors 201, 301, and 401 may be turned on. The scan transistors 201, 301, and 401 may receive the data line D through the first input / output terminal T2. 1 , D 2 and D 3 The RGB image signal can be output through the second input / output terminal T3 to the data line D 1 , D 2 and D 3 In addition, when no activation signal is received from the scan driver 104b to the control terminal T1, the scan transistors 201, 301 and 401 may be turned off.

[0111] The driving transistors 202, 302, and 402 may be thin film transistors including a control terminal T4 and first and second input / output terminals T5 and T6. The driving transistors 202, 302, and 402 may allow current to flow between the first and second input / output terminals T5 and T6 (turn on) or may prevent current from flowing between the first and second input / output terminals T5 and T6 (turn off) according to a control signal input to the control terminal T4.

[0112] The driving transistors 202 , 302 , and 402 may output driving currents to the light emitting elements 200 , 300 , and 400 according to RGB image signals output from the data driver 104 a and passing through the scanning transistors 201 , 301 , and 401 .

[0113] For example, the control terminal T4 of the driving transistor 202, 302 and 402 can be connected to the second input / output terminal T3 of the scanning transistor 201, 301 and 401, the first input / output terminal T5 of the driving transistor 202, 302 and 402 can be connected to the power supply VDD, and the second input / output terminal T6 of the scanning transistor 201, 301 and 401 can be connected to the light emitting element 200, 300 and 400. The driving transistor 202, 302 and 402 can control the amplitude of the current flowing between the first input / output terminal T5 and the second input / output terminal T6 according to the RGB image signal input to the control terminal T4. In other words, the driving transistor 202, 302 and 402 can control the amplitude of the current provided to the light emitting element 200, 300 and 400 according to the RGB image signal.

[0114] The storage capacitors 203, 303, and 403 store the RGB image signals input from the data driver 104a to the driving transistors 202, 302, and 402 through the scanning transistors 201, 301, and 401, and can output voltages corresponding to the RGB image signals. For example, the storage capacitors 203, 303, and 403 can be connected between the control terminal T4 and the second input / output terminal T6 of the driving transistors 202, 302, and 402, and the voltage corresponding to the RGB image signals can be output between the control terminal T4 and the second input / output terminal T6 of the driving transistors 202, 302, and 402. The driving transistors 202, 302, and 402 can control the magnitude of the current supplied to the light emitting elements 200, 300, and 400 according to the voltage of the RGB image signals stored in the storage capacitors 203, 303, and 403.

[0115] The light emitting elements 200, 300 and 400 may output light of different intensities according to the magnitude of current supplied from the driving transistors 202, 302 and 402. In other words, the light emitting elements 200, 300 and 400 may output light of different intensities according to the RGB image signals output from the data driver 104a.

[0116] In addition, depending on the constituent materials, the light emitting elements 200, 300 and 400 may emit light having different wavelengths (different colors). For example, the light emitting diode panel 103 may include a red light emitting element 200 emitting red light, a green light emitting element 300 emitting green light, and a blue light emitting element 400 emitting blue light.

[0117] The red light emitting element 200, the green light emitting element 300 and the blue light emitting element 400 may be respectively disposed in the red sub-pixel P R , green sub-pixel P G and blue sub-pixel P B The corresponding position.

[0118] The red light-emitting element 200 can output red light with different intensities according to the red image signal (hereinafter referred to as the "R image signal") output from the data driver 104a, the green light-emitting element 300 can output green light with different intensities according to the green image signal (hereinafter referred to as the "G image signal") output from the data driver 104a, and the blue light-emitting element 400 can output blue with different intensities according to the blue image signal (hereinafter referred to as the "B image signal") output from the data driver 104a.

[0119] The light emitting elements 200, 300, and 400 may include micro light emitting diodes each having a size of 100 um×100 um or less.

[0120] As described above, the display device 100 may include the light emitting diode panel 103 including the red light emitting element 200 , the green light emitting element 300 , and the blue light emitting element 400 .

[0121] The red light emitting element 200, the green light emitting element 300, and the blue light emitting element 400 may have various structures for emitting red light, green light, and blue light, respectively.

[0122] Hereinafter, structures of the red light emitting element 200 , the green light emitting element 300 , and the blue light emitting element 400 may be described.

[0123] Figure 5 is a view showing an example of a light emitting element included in a display device according to an embodiment. Figure 6 It is shown Figure 5A view showing a structure of a red light emitting element included in a display device and a spectrum of light output from the red light emitting element. Figure 7 It is shown Figure 5 A diagram showing a structure of a green light-emitting element included in a display device and a spectrum of light output from the green light-emitting element. Figure 8 It is shown Figure 5 A diagram showing a structure of a blue light emitting element included in a display device and a spectrum of light output from the blue light emitting element.

[0124] Figure 5 (a) shows one pixel included in the display device 100, and Figure 5 (b) shows Figure 5 Section AA' shown in (a).

[0125] like Figure 5 As shown in (a), the pixel P may include a red sub-pixel P R , green sub-pixel P G and blue sub-pixel P B . Red sub-pixel P R , green sub-pixel P G and blue sub-pixel P B Can be arranged side by side.

[0126] In addition, the red sub-pixel P R It may include a red light emitting element 200, a green sub-pixel P G A green light emitting element 300 may be included, and a blue sub-pixel P B A blue light emitting element 400 may be included.

[0127] like Figure 5 (b) and Figure 6 As shown in (a), the red light emitting element 200 may include a first light emitting diode 210 , a red light conversion layer 220 and a red filter 230 .

[0128] The first light emitting diode 210 may include a cathode terminal 211 and an anode terminal 212, and may be connected to a driving circuit through the cathode terminal 211 and the anode terminal 212. The driving circuit may include scanning transistors 201, 301, and 401, driving transistors 202, 302, and 402, and storage capacitors 203, 303, and 403, as shown above. Figure 4 The first light emitting diode 210 can receive a driving current from the driving circuit through the cathode terminal 211 and the anode terminal 212 and emit light. Figure 6 As shown in (b), the first light emitting diode 210 may emit light having a maximum intensity at a wavelength λB1 similar to a blue wavelength (hereinafter referred to as “light having a wavelength similar to a blue wavelength”).

[0129] The red light conversion layer 220 can absorb the light emitted from the first light emitting diode 210 and can emit light having a maximum intensity at a red wavelength λR (hereinafter referred to as "light having a red wavelength"). In other words, the red light conversion layer 220 can convert light having a wavelength λB1 similar to a blue wavelength into light having a red wavelength λR.

[0130] For example, the red light conversion layer 220 may include quantum dots for changing the wavelength of incident light. Quantum dots may refer to small spherical semiconductor particles of nanometer size (nm, one billionth of a meter), and may have a size of about 2nm to 10nm. Quantum dots may be composed of a core composed of cadmium selenide (CdSe), cadmium telluride (CdTe), cadmium sulfide (CdS), etc., and a shell composed of zinc sulfide (ZnS).

[0131] Quantum dots can have different optical properties than the bulk material of the same material. For example, quantum dots can emit light when a voltage is applied, or emit light of a specific wavelength when light is incident on them. In other words, quantum dots can output light with a different wavelength than the incident light.

[0132] The wavelength of light emitted by a quantum dot can vary depending on the size of the quantum dot. The energy band gap between the valence band and the conduction band can vary depending on the size of the quantum dot, and the wavelength of light emitted from the quantum dot can vary depending on the size of the quantum dot.

[0133] For example, in the case of cadmium selenite (CdSe) quantum dots, when the diameter of the quantum dots is about 10 nm or less, the band gap can be increased by the quantum confinement effect. As the band gap increases, the wavelength of light emitted from the quantum dots can be shortened (the frequency of light emitted from the quantum dots can be increased). In other words, a CdSe block may emit red light, but as its size decreases, a CdSe quantum dot may emit yellow, green, and blue light.

[0134] In this way, quantum dots can emit light of different wavelengths (different colors) depending on their size. For example, a quantum dot with a diameter of about 2.5nm can emit about blue light, and a quantum dot with a diameter of about 4nm can emit about green light. In addition, a quantum dot with a diameter of about 7nm may emit about red light.

[0135] The red light conversion layer 220 may include quantum dots capable of emitting red light. For example, the red light conversion layer 220 may include quantum dots having a diameter of about 7 nm.

[0136] In addition, the red light conversion layer 220 may include a red fluorescent material that converts light having a wavelength λB1 similar to a blue wavelength into light having a red wavelength λR.

[0137] like Figure 6 As shown in (c), the light emitted from the red light conversion layer 220 may include light emitted from the first light emitting diode 210 and passing through the red light conversion layer 220 (light having a wavelength similar to a bluish-red wavelength) and light having a wavelength converted by the red light conversion layer 220 (light having a blue wavelength).

[0138] The red filter 230 may pass light having a red wavelength λR among incident light and may block light having a wavelength different from the red light. Specifically, the red filter 230 may pass light having a red wavelength λR and block light having a wavelength λB1 similar to a blue wavelength.

[0139] The red filter 230 is not limited to an optical filter that allows light having a red wavelength λR to pass. Figure 6 As shown in (d), the red filter 230 may include an optical filter that blocks light (eg, blue) having a wavelength shorter than the red wavelength λR and passes light having a wavelength longer than the red wavelength λR.

[0140] A portion of light (light with a color similar to blue) emitted from the first light emitting diode 210 included in the red light emitting element 200 may be changed into red light when passing through the red light conversion layer 220, and another portion of light (light with a color similar to blue) emitted from the first light emitting diode 210 may be blocked by the red filter 230. As a result, Figure 6 As shown in (e), the red light emitting element 200 can emit light having a maximum intensity at a red wavelength λR.

[0141] At this time, the wavelength deviation of the red light emitted from the red light emitting element 200 may be very small (may be about 2 nm or less). As described above, the blue light emitted from the first light emitting diode 210 may be converted into red light by the red light conversion layer 220, and the wavelength of the light emitted from the red light conversion layer 220 may depend on the size of the quantum dots. The size of the red quantum dots can be adjusted very accurately, and the size variation between the quantum dots is very small. Therefore, the wavelength deviation of the light emitted from the red light conversion layer 220 may also be very small.

[0142] like Figure 5 (b) and Figure 7 As shown in (a), the green light emitting element 300 may include a second light emitting diode 310 , a green light conversion layer 320 and a green filter 330 .

[0143] The second light emitting diode 310 can receive a driving current from a driving circuit through a cathode terminal 311 and an anode terminal 312. Figure 7 As shown in (b), the second light emitting diode 310 may emit light having a wavelength λB1 similar to a blue wavelength.

[0144] The green light conversion layer 320 can absorb the light (light having a wavelength similar to the blue wavelength) emitted from the second light emitting diode 310, and can emit light having a maximum intensity at the green light wavelength λG (hereinafter referred to as "light having a green wavelength"). In other words, the red light conversion layer 220 can convert the light having a wavelength λB1 similar to the blue wavelength into light having a green wavelength λG.

[0145] The green light conversion layer 320 may include quantum dots capable of emitting green light. For example, the green light conversion layer 320 may include quantum dots having a diameter of about 4 nm.

[0146] In addition, the green light conversion layer 320 may include a green fluorescent material that converts light having a wavelength λB1 similar to a blue wavelength into light having a green wavelength λG.

[0147] like Figure 7 As shown in (c), the light emitted from the green light conversion layer 320 may include light emitted from the second light emitting diode 310 and passing through the green light conversion layer 320 (light having a wavelength similar to the blue wavelength) and light having a wavelength converted by the green light conversion layer 320 (light having a green wavelength).

[0148] The green filter 330 may pass light having a green wavelength λG among incident light, and may block light having a wavelength different from the green light. In particular, the green filter 330 may pass light having a green wavelength λG converted by the green light conversion layer 320, and may block light having a wavelength λB1 similar to the blue wavelength passing through the green light conversion layer 320.

[0149] The green filter 330 is not limited to an optical filter that passes a wavelength corresponding to green light. Figure 7 As shown in (d), the green filter 330 may include an optical filter that blocks light (eg, blue) having a wavelength shorter than the green wavelength λG and passes light having a wavelength longer than the green wavelength λG.

[0150] A portion of the light of a color similar to blue emitted from the second light emitting diode 310 included in the green light emitting element 300 may be changed to green while passing through the green light conversion layer 320, and a portion of the other portion of the light may be blocked by the green filter 330. As a result, Figure 7As shown in (e), the green light emitting element 300 can emit light having a maximum intensity at a green wavelength λG.

[0151] At this time, the wavelength deviation of the green light emitted from the green light emitting element 300 may be very small (may be about 2 nm or less) because the size of the green quantum dots can be adjusted very accurately and the size variation between quantum dots is very small.

[0152] like Figure 5 (b) and Figure 8 As shown in (a), the blue light emitting element 400 may include a third light emitting diode 410 , a transparent resin layer 420 and a blue filter 430 .

[0153] The third light emitting diode 410 can receive a driving current from the driving circuit through the cathode terminal 411 and the anode terminal 412. Figure 8 As shown in (b), the third light emitting diode 410 may emit light having a wavelength λB1 similar to a blue wavelength.

[0154] The transparent resin layer 420 may pass light (light having a wavelength similar to the blue wavelength) emitted from the third light emitting diode 410. The transparent resin layer 420 may be composed of various transparent resins such as PC (polycarbonate), PES (polyethersulfone), PMMA (polymethyl methacrylate), PVA (polyvinyl alcohol), and PI (polyimide).

[0155] like Figure 8 As shown in (c), the blue filter 430 can pass light having a blue wavelength λB among incident light and block light having a wavelength different from blue. In particular, the blue filter 430 can pass light having a blue wavelength λB among light emitted from the third light emitting diode 410 and block light having a wavelength λB1 similar to the blue wavelength.

[0156] The blue filter 430 may reduce a wavelength deviation of light (light having a wavelength similar to a blue wavelength) emitted from the third light emitting diode 410 .

[0157] The wavelength deviation of the light emitted from the third light emitting diode 410 may be relatively large (about 10 nm or more). As the light emitting diode, a mixed semiconductor such as gallium arsenide (GaAs), indium gallium nitride (InGaN), and gallium nitride (GaN) may be used. The light emitting diode may be manufactured by growing a first epitaxial layer including a first impurity on a substrate and then growing a second epitaxial layer including a second impurity. Light may be emitted at a boundary (PN junction) between the first epitaxial layer including the first impurity and the second epitaxial layer including the second impurity.

[0158] At this time, the wavelength of light emitted from the light emitting diode can be changed according to the mixing ratio of the base materials Ga, As, In, N, etc., the concentration of the first impurity contained in the first epitaxial layer and / or the concentration of the second impurity contained in the second epitaxial layer. It is known that a blue light emitting diode has a wavelength deviation of about 10 nm or more due to the concentration change of the first impurity and / or the concentration change of the second impurity.

[0159] Light emitted from the third light emitting diode 410 (light having a wavelength similar to the blue wavelength) has a wavelength deviation of about 10 nm or more, and thus the color gamut of the display device 100 may be reduced to increase display color uniformity after correcting the wavelength deviation.

[0160] In order to reduce the wavelength deviation of the blue color emitted from the third light emitting diode 410, the third light emitting diode 410 may output light having a maximum intensity at a wavelength (about 440nm to 450nm) shorter than the blue wavelength (about 465nm). The blue filter 430 may block light having a wavelength shorter than the blue wavelength (about 465nm).

[0161] As a result, the light passing through the blue filter 430 can have a maximum intensity at about a blue wavelength (about 465 nm). In addition, the wavelength deviation of the light passing through the blue filter 430 can be reduced to about 2 nm or less. In other words, the wavelength deviation of the blue emitted from the blue light emitting element 400 can be about 2 nm or less.

[0162] Hereinafter, reducing the wavelength deviation of blue emitted from the blue light emitting element 400 will be described in more detail.

[0163] Fig. 9 and Fig.10 It is shown from Figure 5 A diagram showing wavelength deviation of light output by a blue light emitting diode included in a display device is shown. Fig.11 , Fig.12 and Fig.13 It is shown from Figure 5 A diagram showing a wavelength deviation of light output by a blue light emitting element included in a display device.

[0164] like Fig. 9 As shown, a plurality of blue light emitting diodes 410-1, 410-2, 410-3, ... and 410-n may be manufactured on a single wafer W. For example, the blue light emitting diodes 410-1, 410-2, 410-3, ... and 410-n may be made of gallium nitride (GaN) and may emit light having a maximum intensity at a wavelength similar to a blue wavelength.

[0165] In particular, a PN junction can be formed by growing a first epitaxial layer containing a first impurity on a wafer W forming a substrate, and then growing a second epitaxial layer containing a second impurity. A PN junction diode can be manufactured by cutting the wafer W formed with the PN junction into a predetermined size, and the PN junction diode can become a blue light emitting diode capable of emitting light.

[0166] For example, the first blue light emitting diode 410 - 1 , the second blue light emitting diode 410 - 2 , the third blue light emitting diode 410 - 3 , and the nth blue light emitting diode 410 - n may be manufactured from a single wafer W by cutting the wafer W in which the PN junction is formed.

[0167] At this time, the concentration of the first impurity contained in the substrate and / or the concentration of the second impurity contained in the second epitaxial layer may be different from each other depending on the position in the single wafer W, the mixing ratio of the base materials Ga and N. In addition, the wavelength of light emitted from the light emitting diode may be changed according to the mixing ratio of the base materials Ga and N, the concentration of the first impurity contained in the first epitaxial layer, and / or the concentration of the second impurity contained in the second epitaxial layer.

[0168] As a result, the blue light emitting diodes 410-1, 410-2, 410-3, ..., and 410-n manufactured on the single wafer W may emit light of different wavelengths. In other words, the wavelengths of light emitted from the blue light emitting diodes 410-1, 410-2, 410-3, ..., and 410-n manufactured on the single wafer W may deviate. As is well known, the wavelength deviation between the blue light emitting diodes 410-1, 410-2, 410-3, ..., and 410-n is about 10 nm.

[0169] For example, Fig.10 As shown, the wavelength λ1 of light emitted from the first blue light emitting diode 410-1 manufactured by a single wafer W, the wavelength λ2 of light emitted from the second blue light emitting diode 410-2, the wavelength λ3 of light emitted from the third blue light emitting diode 410-3, and the wavelength λn of light emitted from the nth blue light emitting diode 410-n may be different from each other.

[0170] In addition, the deviation between the wavelengths λ1, λ2, λ3, ... and λn of the light emitted from the first to nth blue light emitting diodes 410-1, 410-2, 410-3, ... and 410-n may be about 10 nm. In particular, the first to nth blue light emitting diodes 410-1, 410-2, 410-3, ... and 410-n may emit light having a wavelength of 440 nm to 450 nm.

[0171] Thus, the plurality of blue light emitting diodes 410-1, 410-2, 410-3, ..., and 410-n manufactured from a single wafer W may emit light having a wavelength similar to blue, and there may be a deviation between the wavelengths of the light emitted from the plurality of blue light emitting diodes 410-1, 410-2, 410-3, ..., and 410-n. In addition, the light emitted from the plurality of blue light emitting diodes 410-1, 410-2, 410-3, ..., and 410-n may have any wavelength of 440 nm to 450 nm.

[0172] In addition, the display device 100 may include a plurality of blue light emitting elements 400 , and the plurality of blue light emitting elements 400 may include a plurality of blue light emitting diodes 410 - 1 , 410 - 2 , 410 - 3 , . . . , and 410 - n and a plurality of blue filters 430 , respectively.

[0173] The blue filter 430 may pass light having an approximately blue wavelength or light having a wavelength longer than the approximately blue wavelength λB, and may block light having a wavelength shorter than the approximately blue wavelength λB.

[0174] For example, the blue filter 430 may have Fig.11 In particular, the blue filter 430 has a transmittance of about 20% at about 462 nm, a transmittance of about 40% at about 466 nm, a transmittance of about 60% at about 470 nm, and a transmittance of about 80% at about 474 nm. In particular, the characteristic curve of the blue filter 430 may intersect the spectrum curves of the blue light emitting diodes 410-1, 410-2, 410-3, ... and 410-n at a wavelength of about 465 nm.

[0175] As a result, the light passing through the blue filter 430 may have a maximum intensity at about 465 nm, as shown in FIG. Fig.12 In addition, the wavelength deviation of the light having the maximum intensity passing through the blue filter 430 can be reduced to about 2 nm.

[0176] As described above, each of the plurality of blue light emitting diodes 410-1, 410-2, 410-3, ... and 410-n can emit light having a maximum intensity at a wavelength shorter than the blue wavelength (about 440nm to 450nm). In addition, the blue filter 430 can block light having a wavelength shorter than the blue wavelength (about 465nm) and pass light having a wavelength longer than the blue wavelength (about 465nm), and the transmittance can be rapidly increased at the blue wavelength (about 465nm).

[0177] As a result, the wavelength deviation of the light passing through the blue filter 430 can be significantly reduced compared to the wavelength deviation of the light emitted from the plurality of blue light emitting diodes 410-1, 410-2, 410-3, ... and 410-n. In other words, the wavelength deviation of the light emitted from the plurality of blue light emitting elements 400 can be significantly reduced compared to the wavelength deviation of the light emitted from the plurality of blue light emitting diodes 410-1, 410-2, 410-3, ... and 410-n.

[0178] Furthermore, a brightness correction process may be performed to reduce brightness deviation of light emitted from the plurality of blue light emitting elements 400 .

[0179] For example, a driving current may be supplied to the blue light emitting element 400, and a separately provided luminance meter (not shown) may be used to measure the luminance of the blue light emitting element 400. The driving current supplied to the blue light emitting element 400 may be controlled so that the luminance of the blue light emitting element 400 measured by the luminance meter has a predetermined luminance value.

[0180] like Figure 4 As shown, each of the plurality of pixels P may further include a compensation circuit for compensating for a driving current provided to the blue light emitting element 400 , and a driving circuit for providing a driving current to the blue light emitting element 400 .

[0181] By providing the compensation circuits in the plurality of pixels P, the plurality of blue light emitting elements 400 can emit light having a predetermined brightness value, such as Fig.13 As a result, the brightness deviation of the light emitted from the plurality of blue light emitting elements 400 can be reduced.

[0182] As described above, the blue light emitting element may include a blue light emitting diode and a blue filter. The blue light emitting diode may emit light having a wavelength shorter than the blue wavelength, and the blue filter may block light having a wavelength shorter than the blue wavelength. As a result, the wavelength deviation of the blue light emitted from the plurality of blue light emitting elements may be reduced compared to the wavelength deviation of the light emitted from the blue light emitting diode.

[0183] The red light emitting element may include a blue light emitting diode and a red light conversion layer. The red light conversion layer may absorb light emitted from the blue light emitting diode and emit light having a red wavelength. The wavelength deviation of the red light emitted from the red light conversion layer may be reduced compared to the wavelength deviation of the light emitted from the blue light emitting diode.

[0184] In addition, the green light emitting element may include a blue light emitting diode and a green light conversion layer. The green light conversion layer may absorb light emitted from the blue light emitting diode and emit light having a green wavelength. The wavelength deviation of the green light emitted from the green light conversion layer may be reduced compared to the wavelength deviation of the light emitted from the blue light emitting diode.

[0185] Fig.14 It shows the manufacturing Figure 5 A diagram showing a process for including a blue light emitting element in a display device. Fig.15 It shows the manufacturing Figure 5 A diagram showing a process for including a red light emitting element in a display device. Fig.16 It shows the manufacturing Figure 5 A view showing a process for including a green light emitting element in a display device.

[0186] The blue light emitting element 400 may include a blue light emitting diode, a transparent resin layer, and a blue filter.

[0187] like Fig.14 As shown in (a), a wafer W may be provided, and a plurality of light emitting diodes may be formed on the wafer W. For example, a plurality of PN junctions may be formed by growing a first epitaxial layer containing a first impurity on the wafer W forming a substrate, and then growing a second epitaxial layer containing a second impurity. Each of the plurality of PN junctions may be a light emitting diode.

[0188] Afterwards, if Fig.14 As shown in (b), the transparent resin layer 420 may be formed on the wafer W on which the plurality of light emitting diodes are formed. For example, the transparent resin layer 420 may be formed by applying (or coating) a liquid transparent resin on the wafer W and curing the liquid transparent resin. The transparent resin layer 420 may be formed of various transparent resins such as PC, PES, PMMA, PVA, and PI.

[0189] Afterwards, if Fig.14 As shown in (c), a blue filter 430 may be formed on the wafer W having the transparent resin layer 420 formed thereon. For example, the blue filter 430 may be formed by applying (or coating) a liquid blue pigment on the transparent resin layer 420 and curing the liquid blue pigment.

[0190] Thereafter, the blue light emitting element 400 may be manufactured by cutting the wafer W formed with the transparent resin layer 420 and the blue filter 430 into a proper size.

[0191] The red light emitting element 200 may include a blue light emitting diode, a red light conversion layer, and a red filter.

[0192] like Fig.15 As shown in (a) of FIG. 1 , a wafer W may be provided, and a plurality of light emitting diodes may be formed on the wafer W. The wafer W having the plurality of light emitting diodes formed thereon may be Fig.14 The same as the wafer W shown in (a).

[0193] Then, if Fig.15As shown in (b), a red light conversion layer 220 may be formed on a wafer W on which a plurality of blue light emitting diodes are formed. For example, the red light conversion layer 220 may be formed by applying (or coating) a material in which quantum dots having a diameter of about 7 nm are mixed with a liquid transparent resin on the wafer W, and curing the material in which the quantum dots are mixed with the transparent resin.

[0194] Afterwards, if Fig.15 As shown in (c), the red filter 230 may be formed on the wafer W having the red light conversion layer 220 formed thereon. For example, the red filter 230 may be formed by applying (or coating) a liquid red pigment on the red light conversion layer 220 and curing the liquid red pigment.

[0195] The green light emitting element 300 may include a blue light emitting diode, a green light conversion layer, and a green filter.

[0196] like Fig.16 As shown in (a) of FIG. 1 , a wafer W may be provided, and a plurality of light emitting diodes may be formed on the wafer W. The wafer W having the plurality of light emitting diodes formed thereon may be Fig.14 The same as the wafer W shown in (a).

[0197] Then, if Fig.16 As shown in (b), a green light conversion layer 320 may be formed on a wafer W on which a plurality of blue light emitting diodes are formed. For example, the green light conversion layer 320 may be formed by applying (or coating) a material mixed with quantum dots having a diameter of about 4 nm and a liquid transparent resin on the wafer W and curing the material mixed with the quantum dots and the transparent resin.

[0198] Afterwards, if Fig.16 As shown in (c), a green filter 330 may be formed on the wafer W having the green light conversion layer 320 formed thereon. For example, the green filter 330 may be formed by applying (or coating) a liquid green pigment on the green light conversion layer 320 and solidifying the liquid green pigment.

[0199] Fig.17 is a view showing another example of a light emitting element included in a display device according to an embodiment. Fig.18 It is shown Fig.17 A diagram showing a structure of a red light emitting element included in a display device and a spectrum of light output from the red light emitting element. Fig.19 It is shown Fig.17 A diagram showing a structure of a green light-emitting element included in a display device and a spectrum of light output from the green light-emitting element. Fig. 20 It is shown Fig.17 A diagram showing a structure of a blue light emitting element included in a display device and a spectrum of light output from the blue light emitting element.

[0200] like Fig.17 As shown, the pixel P may include a red light emitting element 200 , a green light emitting element 300 , and a blue light emitting element 400 .

[0201] like Fig.17 and Fig.18 As shown in (a), the red light emitting element 200 may include a first light emitting diode 210 , a first yellow light conversion layer 240 and a red filter 230 .

[0202] The first light emitting diode 210 can receive a driving current from a driving circuit through a cathode terminal 211 and an anode terminal 212. Fig.18 As shown in (b), light having a maximum intensity at a wavelength λB1 shorter than the blue wavelength (hereinafter referred to as “light having a wavelength shorter than the blue wavelength”) can be emitted.

[0203] The first yellow light conversion layer 240 may absorb light having a wavelength λB1 shorter than the blue wavelength emitted from the second light emitting diode 310, and may emit light having a maximum intensity at a red wavelength λR (light having a red wavelength) and light having a maximum intensity at a green wavelength λG (light having a green wavelength). In other words, the first yellow light conversion layer 240 may convert light having a wavelength λB1 shorter than the blue wavelength into light having a red wavelength λR and light having a green wavelength λG.

[0204] For example, the first yellow light conversion layer 240 may include quantum dots capable of emitting red light and quantum dots capable of emitting green light.

[0205] In addition, the first yellow light conversion layer 240 may include a fluorescent material capable of emitting red light and a fluorescent material capable of emitting green light.

[0206] like Fig.18 As shown in (c), the light emitted from the first yellow light conversion layer 240 may include light having a wavelength λB1 shorter than the blue wavelength having passed through the first yellow light conversion layer 240, and light having a red wavelength λR and light having a green wavelength λG converted by the first yellow light conversion layer 240.

[0207] like Fig.18 As shown in (d), the red filter 230 can pass light having a red wavelength λR among incident light and block light having a wavelength different from the red wavelength λR. In particular, the red filter 230 can pass light having a red wavelength λR and block light having a wavelength λB1 shorter than a blue wavelength and light having a green wavelength λG.

[0208] Results, such as Fig.18As shown in (e), the red light emitting element 200 may emit light having a maximum intensity at a red wavelength λ R. In addition, the wavelength deviation of light emitted from the first light emitting diode 210 may be reduced by the first yellow light conversion layer 240 .

[0209] like Fig.17 and Fig.19 As shown in (a), the green light emitting element 300 may include a second light emitting diode 310 , a second yellow light conversion layer 340 and a green filter 330 .

[0210] The second light emitting diode 310 and the second yellow light conversion layer 340 may be Fig.18 The first light emitting diode 210 and the first yellow light conversion layer 240 shown in FIG. 3 are the same. In particular, the second light emitting diode 310 may emit light having a wavelength λB1 shorter than the blue wavelength, as shown in FIG. Fig.19 In addition, the second yellow light conversion layer 340 can convert a wavelength λB1 shorter than the blue wavelength into light having a red wavelength λR and light having a green wavelength λG. Fig.19 As shown in (c), the second yellow light conversion layer 340 may emit light having a wavelength λB1 shorter than the blue wavelength, light having a red wavelength λR, and light having a green wavelength λG.

[0211] like Fig.19 As shown in (d), the green filter 330 can pass light having a green wavelength λB among incident light, and can block light having a wavelength different from the green light. In particular, the green filter 330 can pass light having a green wavelength λG, and can block light having a wavelength λB1 shorter than the blue wavelength and light having a red wavelength λR.

[0212] Results, such as Fig.19 As shown in (e), the green light emitting element 300 may emit light having a maximum intensity at a green wavelength λ G. In addition, the wavelength deviation of light emitted from the second light emitting diode 310 may be reduced by the second yellow light conversion layer 340 .

[0213] like Fig.17 and Fig. 20 As shown in (a), the blue light emitting element 400 may include a third light emitting diode 410 , a third yellow light conversion layer 440 and a blue filter 430 .

[0214] The third light emitting diode 410 and the third yellow light conversion layer 440 may be Fig.18 The first light emitting diode 210 and the first yellow light conversion layer 240 are shown to be the same. In particular, the third light emitting diode 410 may emit light having a wavelength λB1 shorter than the blue wavelength, such as Fig. 20In addition, the third yellow light conversion layer 440 can convert a wavelength λB1 shorter than the blue wavelength into light having a red wavelength λR and light having a green wavelength λG. Fig. 20 As shown in (c), the third yellow light conversion layer 440 may emit light having a wavelength λB1 shorter than the blue wavelength, light having a red wavelength λR, and light having a green wavelength λG.

[0215] like Fig. 20 As shown in (d), the blue filter 430 can pass light having a blue wavelength λB among incident light, and can block light having a wavelength different from blue. In particular, the blue filter 430 can pass light having a blue wavelength λB, and can block light having a red wavelength λR and light having a green wavelength λG.

[0216] In addition, the third light emitting diode 410 may emit light having a wavelength λB1 shorter than the blue wavelength λB, and the blue filter 430 may block light having a wavelength shorter than the blue wavelength λB and may pass light having a wavelength longer than the blue wavelength λB.

[0217] Results, such as Fig. 20 As shown in (e), the blue light emitting element 400 may emit light having a maximum intensity at a blue wavelength λ B. In addition, the blue filter 430 may reduce a wavelength deviation emitted from the third light emitting diode 410 .

[0218] Fig.21 It shows the manufacturing Fig.17 A view of the process of a red light emitting element, a green light emitting element, and a blue light emitting element is shown.

[0219] like Fig.21 As shown in (a), a wafer W may be provided, and a plurality of blue light emitting diodes may be formed on the wafer W. For example, a plurality of PN junctions may be formed by growing a first epitaxial layer containing a first impurity on the wafer W forming a substrate, and then growing a second epitaxial layer containing a second impurity. Each of the plurality of PN junctions may be a blue light emitting diode.

[0220] Afterwards, if Fig.21 As shown in (b), the yellow light conversion layers 240, 340 and 440 may be formed on the wafer W on which the plurality of blue light emitting diodes are formed. For example, the red light conversion layer 220 may be formed by applying (or coating) a material on which quantum dots with a diameter of about 7 nm, quantum dots with a diameter of about 4 nm and a liquid transparent resin are mixed on the wafer W, and may be formed by curing the material in which the quantum dots and the transparent resin are mixed.

[0221] Afterwards, if Fig.21As shown in (c), the color filters 230, 330, and 430 may be formed on the wafer W on which the yellow light conversion layers 240, 340, and 440 are formed. The color filters 230, 330, and 430 may include a red filter 230, a green filter 330, and a blue filter 430. The red filter 230, the green filter 330, and the blue filter 430 may be arranged side by side on the yellow light conversion layers 240, 340, and 440. For example, the color filters 230, 330, and 430 may apply (or coat) liquid red pigment, green pigment, and blue pigment on the yellow light conversion layers 240, 340, and 440, and may be formed by curing the liquid pigment.

[0222] Fig. 22 is a view showing another example of a light emitting element included in a display device according to an embodiment. Fig.23 It is shown Fig. 22 A diagram showing a structure of a red light emitting element included in a display device and a spectrum of light output from the red light emitting element. Fig.24 It is shown Fig. 22 A diagram showing a structure of a green light-emitting element included in a display device and a spectrum of light output from the green light-emitting element. Fig.25 It is shown Fig. 22 A diagram showing a structure of a blue light emitting element included in a display device and a spectrum of light output from the blue light emitting element.

[0223] like Fig. 22 As shown, the display device 100 may include a red light emitting element 200 , a green light emitting element 300 , and a blue light emitting element 400 .

[0224] like Fig. 22 and Fig.23 As shown in (a), the red light emitting element 200 may include a red light emitting diode 250 and a red filter 230 .

[0225] A driving current may be provided from a driving circuit to the red light emitting diode 250 through the cathode terminal 251 and the anode terminal 252. Fig.23 As shown in (b), the red light emitting diode 250 may emit light having a maximum intensity at a wavelength λR1 which is similar to but shorter than the red wavelength λR.

[0226] The red filter 230 may block light having a wavelength shorter than the red wavelength λR and pass light having a wavelength longer than the red wavelength λR. Among the light emitted from the red light emitting diode 250, light having a wavelength longer than the red wavelength λR may pass through the red filter 230, and thus, the light passing through the red filter 230 may have a maximum intensity at the red wavelength λR.

[0227] Results, such as Fig.23 As shown in (c), the red light emitting element 200 may emit light having a maximum intensity at a red wavelength λ R. In addition, the wavelength deviation of the light emitted from the red light emitting diode 250 may be reduced by the red filter 230 .

[0228] like Fig. 22 and Fig.24 As shown in (a), the green light emitting element 300 may include a green light emitting diode 350 and a green filter 330 .

[0229] A driving current from a driving circuit may be provided to the green light emitting diode 350 through the cathode terminal 351 and the anode terminal 352. Fig.24 As shown in (b), the green light emitting diode 350 may emit light having a maximum intensity at a wavelength λG1 which is similar to but shorter than the green wavelength λG.

[0230] The green filter 330 may block light having a wavelength shorter than the green wavelength λ G and pass light having a wavelength longer than the green wavelength λ G. Among the light emitted from the green light emitting diode 350, light having a wavelength longer than the green wavelength λ G may pass through the green filter 330, and thus the light passing through the green filter 330 may have a maximum intensity at the green wavelength λ G.

[0231] Results, such as Fig.24 As shown in (c), the green light emitting element 300 may emit light having a maximum intensity at a green wavelength λ G. In addition, the wavelength deviation of the light emitted from the green light emitting diode 350 may be reduced by the green filter 330 .

[0232] like Fig. 22 and Fig.25 As shown in (a), the blue light emitting element 400 may include a blue light emitting diode 450 and a blue filter 430 .

[0233] A driving current may be provided from a driving circuit to the blue light emitting diode 450 through the cathode terminal 451 and the anode terminal 452. Fig.25 As shown in (b), the blue light emitting diode 450 may emit light having a maximum intensity at a wavelength λB1 which is similar to but shorter than the blue wavelength λB.

[0234] The blue filter 430 may block light having a wavelength shorter than the blue wavelength λB and pass light having a wavelength longer than the blue wavelength λB. Among the light emitted from the blue light emitting diode 450, light having a wavelength longer than the blue wavelength λB may pass through the blue filter 430, and thus the light passing through the blue filter 430 may have a maximum intensity at the blue wavelength λB.

[0235] Results, such as Fig.25 As shown in (c), the blue light emitting element 400 may emit light having a maximum intensity at a blue wavelength λ B. In addition, the wavelength deviation of light emitted from the blue light emitting diode 450 may be reduced by the blue filter 430 .

[0236] At the same time, the disclosed embodiments can be implemented in the form of a recording medium storing instructions executable by a computer. The instructions can be stored in the form of program code, and when executed by a processor, the instructions can generate a program module to perform the operations of the disclosed embodiments. The recording medium can be implemented as a computer-readable recording medium.

[0237] The computer-readable recording medium may include all kinds of recording media storing commands that can be interpreted by a computer. For example, the computer-readable recording medium may be a ROM, RAM, a magnetic tape, a magnetic disk, a flash memory, an optical data storage device, and the like.

[0238] So far, embodiments and examples of the present disclosure have been described with reference to the accompanying drawings. It will be clear to those skilled in the art that the present disclosure can be practiced in other forms than the above-described embodiments without changing the technical ideas or basic features of the present disclosure. The above embodiments are merely exemplary and should not be interpreted in a limiting sense.

Claims

1. A display device, comprising: a blue light emitting element configured to emit blue light; a red light emitting element configured to emit red light; as well as A green light emitting element is configured to emit green light, Wherein, the blue light emitting element comprises: a first light emitting diode configured to emit light having a maximum intensity at a wavelength shorter than a blue wavelength; and a blue filter configured to transmit light having a blue wavelength; wherein the first light emitting diode is configured to emit light having a maximum intensity at any wavelength between 440 nm and 450 nm, and The blocking characteristic curve of the blue filter is configured to intersect with the spectrum curve of the first light emitting diode at 465 nm.

2. The display device according to claim 1, wherein: The blue light emitting element further includes a transparent resin layer disposed between the first light emitting diode and the blue filter, the transparent resin layer being configured to transmit light emitted from the first light emitting diode.

3. The display device according to claim 1, wherein: The blue light emitting element also includes a yellow quantum dot material layer, which is arranged between the first light emitting diode and the blue filter, and the yellow quantum dot material layer is configured to absorb light emitted from the first light emitting diode and emit light with a wavelength shorter than the blue wavelength, light with a red wavelength, and light with a green wavelength.

4. The display device according to claim 1, further comprising: A driving circuit configured to provide a driving current to the blue light emitting element; as well as A compensation circuit is configured to compensate for the brightness of light emitted from the blue light emitting element.

5. The display device according to claim 4, wherein: The compensation circuit is configured to control the driving current so that light of a predetermined brightness is emitted from the blue light emitting element.

6. The display device according to claim 1, wherein: The red light emitting element comprises: a second light emitting diode configured to emit light having a maximum intensity at a wavelength shorter than a blue wavelength; and The red quantum dot material layer is configured to absorb light emitted from the second light emitting diode and emit light having a red wavelength.

7. The display device according to claim 1, wherein: The red light emitting element comprises: a second light emitting diode configured to emit light having a maximum intensity at a wavelength shorter than a blue wavelength; a yellow quantum dot material layer configured to absorb light emitted from the second light emitting diode and emit light having a wavelength shorter than the blue wavelength, light having a red wavelength, and light having a green wavelength; and The red filter is configured to pass light having a red wavelength.

8. The display device according to claim 1, wherein: The red light emitting element comprises: a second light emitting diode configured to emit light having a maximum intensity at a wavelength shorter than a red wavelength; and A red filter is configured to block light having a wavelength shorter than a red wavelength.

9. The display device according to claim 1, wherein: The green light emitting element comprises: a third light emitting diode configured to emit light having a maximum intensity at a wavelength shorter than a blue wavelength; and The green quantum dot material layer is configured to absorb light emitted from the third light emitting diode and emit light having a green wavelength.

10. The display device according to claim 1, wherein: The green light emitting element comprises: a third light emitting diode configured to emit light having a maximum intensity at a wavelength shorter than a blue wavelength; a yellow quantum dot material layer configured to absorb light emitted from the third light emitting diode and emit light having a wavelength shorter than the blue wavelength, light having a red wavelength, and light having a green wavelength; and The green filter is configured to pass light having a green wavelength.

11. The display device according to claim 1, wherein: The green light emitting element comprises: a second light emitting diode configured to emit light having a maximum intensity at a wavelength shorter than a green wavelength; and A green filter is configured to block light having a wavelength shorter than a green wavelength.

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