Display device

Abstract

Disclosed is a display device including a substrate, a display element layer, and a color filter layer. The display element layer is disposed on the substrate and includes a first display element, a second display element, and a third display element. The first display element, the second display element, and the third display element each emit light having the same peak spectrum. The color filter layer includes a first color filter, a second color filter, and a third color filter disposed on the first display element, the second display element, and the third display element, respectively. The first color filter has a transmission spectrum having a first transmittance in a wavelength range of 510 nm to 550 nm and including 510 nm and 550 nm and a second transmittance in a wavelength range of 630 nm to 660 nm and including 630 nm and 660 nm. A ratio of the first transmittance to the second transmittance is in a range of 1: 0.01 to 1: 0.3 and includes 1: 0.01 and 1: 0.3.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on and claims the benefit of priority from Korean Patent Application No. 10-2023-0114602 filed in the Korean Intellectual Property Office on August 30, 2023, the disclosure of which is incorporated herein by reference in its entirety. Technical Field

[0003] Embodiments relate to a display device. Background Art

[0004] Various flat panel displays such as liquid crystal displays (LCDs), field emission displays (FEDs), and organic light emitting diodes (OLEDs) have been widely used. In particular, micro displays with smaller pixel sizes are used in products such as head mounted displays (HMDs) with glasses-type monitors for virtual reality (VR) or augmented reality.

[0005] Efforts have been made to develop liquid crystal on silicon (LCoS) and organic light emitting diode on silicon (OLEDoS) to improve optical characteristics such as resolution, brightness, and luminous efficiency required by micro displays. Regarding OLEDoS (a display technology in which a semiconductor process is used on a wafer substrate), an organic light emitting diode (OLED) is provided on a semiconductor wafer substrate on which a complementary metal oxide semiconductor (CMOS) field effect transistor is provided. Summary of the invention

[0006] Embodiments may provide a display device having excellent color reproducibility. However, this feature is exemplary, and the scope of the present disclosure is not limited thereto.

[0007] Additional aspects will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the presented embodiments of the disclosure.

[0008] An embodiment of a display device includes: a substrate; a display element layer, which is arranged on the substrate and includes a first display element, a second display element and a third display element, each of which emits light with a same peak spectrum; and a color filter layer, which is arranged on the display element layer and includes a first color filter arranged on the first display element, a second color filter arranged on the second display element and a third color filter arranged on the third display element, the first color filter having a transmission spectrum, the transmission spectrum having a first transmittance within a wavelength range of 510nm to 550nm including 510nm and 550nm and a second transmittance within a wavelength range of 630nm to 660nm including 630nm and 660nm, and a ratio of the first transmittance to the second transmittance is within a range of 1:0.01 to 1:0.3 including 1:0.01 and 1:0.3.

[0009] A ratio of the first transmittance to the second transmittance may be in a range of 1:0.01 to 1:0.1, inclusive.

[0010] The first transmittance may be in the range of 80% to 99% inclusive.

[0011] The second transmittance may be about 1% to about 20%.

[0012] The first subpixel may include a first display element and a first color filter, the second subpixel may include a second display element and a second color filter, and the third subpixel may include a third display element and a third color filter. In color coordinates based on Commission Internationale de Illumination (CIE) color coordinates, an x-coordinate of light emitted by the first subpixel may be in a range of 0.220 to 0.270, inclusive, and a y-coordinate of light emitted by the first subpixel may be in a range of 0.680 to 0.740, inclusive.

[0013] The first display element, the second display element, and the third display element may each emit white light.

[0014] Each of the first display element, the second display element, and the third display element may have a peak in a first wavelength range of 435 nm to 490 nm inclusive, a second wavelength range of 500 nm to 590 nm inclusive, and a third wavelength range of 600 nm to 710 nm inclusive.

[0015] The substrate may include a semiconductor material.

[0016] The display device may further include a pixel circuit layer including at least one transistor between the substrate and the display element layer, and the transistor may be a metal oxide semiconductor field effect transistor (MOSFET).

[0017] An embodiment of a display device includes: a substrate; a display element layer disposed on the substrate and including a first display element, a second display element, and a third display element, each of which emits light having the same peak spectrum; and a color filter layer disposed on the display element layer and including a first color filter disposed on the first display element, a second color filter disposed on the second display element, and a third color filter disposed on the third display element. The first color filter may have a transmission spectrum having a first transmittance in a wavelength range of 510nm to 550nm and including 510nm and 550nm and a second transmittance in a wavelength range of 630nm to 660nm and including 630nm and 660nm, and the first transmittance may be in a range of 80% to 99% and including 80% and 99%.

[0018] A ratio of the first transmittance to the second transmittance may be in a range of 1:0.01 to 1:0.1, inclusive.

[0019] The second transmittance may be in the range of 1% to 20% inclusive.

[0020] The first subpixel may include a first display element and a first color filter, the second subpixel may include a second display element and a second color filter, and the third subpixel may include a third display element and a third color filter. In color coordinates based on Commission Internationale de Illumination (CIE) color coordinates, an x-coordinate of light emitted by the first subpixel may be in a range of 0.220 to 0.270, inclusive, and a y-coordinate of light emitted by the first subpixel may be in a range of 0.680 to 0.740, inclusive.

[0021] Each of the first display element, the second display element, and the third display element may have a peak in a first wavelength range of 435 nm to 490 nm inclusive, a second wavelength range of 500 nm to 590 nm inclusive, and a third wavelength range of 600 nm to 710 nm inclusive.

[0022] The substrate may include a semiconductor material.

[0023] The display device may further include a pixel circuit layer including at least one transistor between the substrate and the display element layer, and the transistor may be a metal oxide semiconductor field effect transistor (MOSFET).

[0024] An embodiment of a display device includes: a substrate; a display element layer disposed on the substrate and including a first display element, a second display element, and a third display element, each of which emits light having the same peak spectrum; and a color filter layer disposed on the display element layer and including a first color filter disposed on the first display element, a second color filter disposed on the second display element, and a third color filter disposed on the third display element. The first color filter has a transmission spectrum having a first transmittance in a wavelength range of 510nm to 550nm and including 510nm and 550nm and a second transmittance in a wavelength range of 630nm to 660nm and including 630nm and 660nm. The first sub-pixel may include a first display element and a first color filter, the second sub-pixel may include a second display element and a second color filter, and the third sub-pixel may include a third display element and a third color filter. In color coordinates based on the International Commission on Illumination (CIE) color coordinates, the x coordinate of the light emitted by the first subpixel may be in the range of 0.220 to 0.270, inclusive, and the y coordinate of the light emitted by the first subpixel may be in the range of 0.680 to 0.740, inclusive.

[0025] The first display element, the second display element, and the third display element may each emit white light.

[0026] Each of the first display element, the second display element, and the third display element may have a peak in a first wavelength range of 435 nm to 490 nm inclusive, a second wavelength range of 500 nm to 590 nm inclusive, and a third wavelength range of 600 nm to 710 nm inclusive.

[0027] A ratio of the first transmittance to the second transmittance may be in a range of 1:0.01 to 1:0.1, inclusive. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and other aspects, features and advantages of certain embodiments of the present disclosure will become more apparent from the following description taken in conjunction with the accompanying drawings, in which:

[0029] Figure 1 is a perspective view schematically showing a display device according to an embodiment;

[0030] Figure 2 is an equivalent circuit diagram of a sub-pixel circuit of a display device according to an embodiment;

[0031] Figure 3 is a cross-sectional view schematically showing a display device according to an embodiment;

[0032] Figure 4 is a graph showing an emission spectrum of a light emitting layer of an organic light emitting diode (OLED) according to an embodiment;

[0033] Figure 5 is a graph schematically showing a transmission spectrum of a first color filter according to an embodiment and a comparative example; and

[0034] Figure 6 It is shown that including according to the above reference Figure 5 A graph of color coordinates of a display device of a first color filter of the described embodiment and comparative example. DETAILED DESCRIPTION

[0035] Reference will now be made in detail to embodiments, examples of which are shown in the accompanying drawings, wherein like reference numerals represent like elements throughout. In this regard, the embodiments may have different forms and should not be construed as being limited to the descriptions set forth herein. Therefore, embodiments are described below only by reference to the accompanying drawings to illustrate aspects of the specification.

[0036] As used herein, the word "or" means a logical "or", such that the expression "A, B, or C" means "A and B and C," "A and B but not C," "A and C but not B," "B and C but not A," "A but not B and not C," "B but not A and not C," and "C but not A and not B," unless the context indicates otherwise. Throughout this disclosure, the expression "at least one of a, b, and c" means only a, only b, only c, both a and b, both a and c, both b and c, all of a, b, and c, or variations thereof.

[0037] Since various modifications and various embodiments of the present disclosure are possible, the specific embodiments are shown in the drawings and described in detail in the specific embodiments. With reference to the embodiments described in detail below in conjunction with the drawings, the effects and features of the present disclosure and the methods for achieving them will be apparent. However, the present disclosure is not limited to the embodiments disclosed herein, but can be implemented in various forms.

[0038] In the following embodiments, the terms first, second, etc. are used for the purpose of distinguishing one element from other elements, and do not have a limiting meaning.

[0039] In the following embodiments, a singular expression includes a plural expression unless the context clearly differs.

[0040] In the following embodiments, terms such as including or having mean that the features or elements described in the specification are present, and do not preclude the possibility that one or more other features or elements will be added.

[0041] In the following embodiments, when a part such as a layer, a region, an element, etc. is on other parts, this means not only when the part is on other elements but also when other elements are interposed therebetween.

[0042] In the drawings, the size of the elements may be exaggerated or reduced for convenience of explanation. For example, since the size and thickness of each element shown in the drawings are arbitrarily represented for convenience of explanation, the present disclosure is not necessarily limited to the drawings.

[0043] In the following embodiments, the case where the wiring “extends in the first direction or the second direction” means not only extending in a straight line shape along the first direction or the second direction but also extending in a zigzag shape or a meandering shape along the first direction or the second direction.

[0044] In the following embodiments, when referred to as a "plane", this means when the target portion is viewed from above, and when referred to as a "cross-sectional view", this means when a cross section of the vertically cut target portion is viewed from the side. In the following embodiments, "overlap" includes "plane" overlap and "cross-sectional" overlap.

[0045] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings, and the same or corresponding components are denoted by the same reference numerals.

[0046] Figure 1 is a perspective view schematically showing a display device 1 according to an embodiment.

[0047] refer to Figure 1 , the display device 1 may include a display area DA in which an image is generated and a non-display area NDA in which an image is not generated. The display device 1 may provide an image by an array of a plurality of sub-pixels two-dimensionally arranged in an xy plane in the display area DA. The plurality of sub-pixels may emit light of different colors and may include, for example, a green sub-pixel, a red sub-pixel, and a blue sub-pixel.

[0048] In an embodiment, the plurality of subpixels may include a first subpixel PX1, a second subpixel PX2, and a third subpixel PX3. Hereinafter, for convenience of explanation, the case where the first subpixel PX1 is a green subpixel, the second subpixel PX2 is a red subpixel, and the third subpixel PX3 is a blue subpixel will be described.

[0049] Each of the first subpixel PX1 , the second subpixel PX2 , and the third subpixel PX3 is a region in which green light, red light, and blue light may be emitted, and the display device 1 may provide an image by using the light emitted from the subpixel.

[0050] The non-display area NDA may be an area in which an image is not provided and may surround the display area DA. In the non-display area NDA, a driver or a main voltage line for providing an electrical signal or power to the pixel circuit may be arranged. A pad (i.e., an area in which an electronic device or a printed circuit board may be electrically connected) may be included in the non-display area NDA.

[0051] The display area DA may have a plurality of Figure 1 For example, the display area DA may have a square shape, a rectangular shape in which the horizontal length is greater than the vertical length, or a rectangular shape in which the horizontal length is less than the vertical length. In another embodiment, the display area DA may have a polygonal shape such as a circular shape, an elliptical shape, a triangular shape, or a pentagonal shape. In addition, Figure 1 The display device 1 shows a flat display device having a flat shape, but the display device 1 may be implemented as a display device having various shapes, such as a flexible, foldable, rollable display device.

[0052] The display device 1 can be applied to various products such as mobile phones, smart phones, desktop personal computers (PCs), mobile communication terminals, electronic notes, electronic books, portable multimedia players (PMPs), navigation devices, ultra-mobile PCs, televisions (TVs), laptop computers, monitors, billboards, Internet of Things (IOT) devices, etc. In addition, the display device 1 according to the embodiment can be used for wearable devices such as smart watches, watch phones, glasses-type displays, or head-mounted displays (HMDs). In addition, the display device 1 according to the embodiment can be used as a vehicle's instrument panel and a central information display (CID) display set on a central instrument panel or dashboard of the vehicle, a room mirror display for replacing a side mirror of the vehicle, and a display screen for entertainment of passengers on the rear seats of the vehicle and set on the rear surface of the front seat.

[0053] In addition, hereinafter, the display device 1 includes an organic light emitting diode (OLED) OLED as a display element. However, the display device 1 according to one or more embodiments is not limited thereto. In another embodiment, the display device 1 may be a light emitting display device including an inorganic light emitting diode (i.e., an inorganic light emitting display device). In another embodiment, the display device 1 may be a quantum dot light emitting display device.

[0054] Figure 2: is an equivalent circuit diagram of one sub-pixel circuit PC of the display device 1 according to the embodiment. The sub-pixel circuit PC may be electrically connected to a display element, and one display element may correspond to one sub-pixel PX. For example, the display element may be an organic light emitting diode OLED.

[0055] The sub-pixel circuit PC may include a first transistor Td, a second transistor Ts, and a storage capacitor Cst. The second transistor Ts may be a switching transistor, may be connected to a scan line SL and a data line DL, may be turned on by a switching signal input from the scan line SL, and may be configured to transmit a data signal input from the data line DL to the first transistor Td. The storage capacitor Cst may have one end electrically connected to the second transistor Ts and the other end electrically connected to the driving voltage line PL, and may store a voltage corresponding to a difference between a voltage transmitted from the second transistor Ts and a driving power supply voltage ELVDD supplied to the driving voltage line PL.

[0056] The first transistor Td may be a driving transistor, may be connected to the driving voltage line PL and the storage capacitor Cst, and may control the magnitude of a driving current flowing from the driving voltage line PL through the organic light emitting diode OLED in response to a voltage value stored in the storage capacitor Cst. The organic light emitting diode OLED may emit light having a certain brightness by using the driving current. The opposite electrode of the organic light emitting diode OLED (see Figure 3 230) can receive the electrode power supply voltage ELVSS.

[0057] Figure 2 The case where the sub-pixel circuit PC includes two transistors and one storage capacitor is shown, and the embodiment is not limited thereto. For example, the number of transistors or the number of storage capacitors may be variously changed according to the design of the sub-pixel circuit PC.

[0058] Figure 3 is a cross-sectional view schematically showing a display device 1 according to an embodiment.

[0059] refer to Figure 3 The display device 1 may include a substrate 100, a pixel circuit layer 110 including a transistor TR, a through-hole insulating layer 120 on the pixel circuit layer 110, a display element layer 140 on the through-hole insulating layer 120, an encapsulation layer 300 on the display element layer 140, and a color filter layer 400 on the encapsulation layer 300.

[0060] The substrate 100 may have an upper surface extending in the x-direction and the y-direction. The substrate 100 may include a semiconductor material, for example, a group IV semiconductor, a group III-V compound semiconductor, or a group II-VI compound semiconductor. That is, the substrate 100 may be a semiconductor substrate including a semiconductor material. Specifically, the substrate 100 may include silicon (Si). That is, the substrate 100 may include a silicon substrate (silicon semiconductor substrate). For example, the substrate 100 may be a silicon wafer. The silicon wafer may include a single crystal silicon wafer, a polycrystalline silicon wafer, or an amorphous silicon wafer.

[0061] Similarly, an organic light emitting diode display device in which a semiconductor substrate is used as the substrate 100 may be referred to as an OLED on silicon (OLEDoS). Since OLEDoS uses a semiconductor substrate as the substrate 100, a transistor manufacturing process commonly used in the field of semiconductor technology may be used as a manufacturing process for the display device. Therefore, it is possible to form ultra-small pixels and control such pixels, so that OLEDoS can display images with ultra-high resolution.

[0062] Depending on the needs of the occasion, the type of substrate 100 may not be limited to a semiconductor substrate. For example, the substrate 100 may include glass, metal, or a polymer resin. In addition, the substrate 100 may include a polymer resin such as polyethersulfone, polyacrylate, polyetherimide, polyethylene naphthalate, polyethylene terephthalate, polyphenylene sulfide, polyarylate, polyimide, polycarbonate, or cellulose acetate propionate. Of course, various modifications are possible, such as the substrate 100 may have a multilayer structure including two layers containing such a polymer resin and a barrier layer between the layers, wherein the barrier layer includes an inorganic material (e.g., silicon oxide, silicon nitride, silicon oxynitride, etc.) between the layers. Hereinafter, the case where the substrate 100 is a silicon substrate will be described in detail.

[0063] The pixel circuit layer 110 may be disposed on the substrate 100. The pixel circuit layer 110 may include Figure 1 The first sub-pixel PX1, the second sub-pixel PX2 and the third sub-pixel PX3 described above correspond to a plurality of sub-pixel circuits PC, and as described above with reference to Figure 2 As described, each of the plurality of sub-pixel circuits PC may include a transistor and a capacitor. The pixel circuit layer 110 may include at least one transistor TR and at least one insulating layer.

[0064] Figure 3 The organic light emitting diode OLED as a display element is shown to be located on the substrate 100. The organic light emitting diode OLED electrically connected to the sub-pixel circuit PC can be understood as the pixel electrode 210 of the organic light emitting diode OLED being electrically connected to the sub-pixel circuit PC (see Figure 2 For the sake of convenience, Figure 3 1 and 2. The transistor TR connected to each of the first organic light emitting diode OLED1, the second organic light emitting diode OLED2, and the third organic light emitting diode OLED3 is shown. Therefore, the transistor TR may correspond to the first transistor described above (see Figure 2 of Td).

[0065] The transistor TR may include a gate dielectric layer GO, a gate electrode GE, and an active region ACT. The transistor TR may be, for example, a metal oxide semiconductor field effect transistor (MOSFET), and embodiments are not limited thereto. In embodiments, the transistors TR may be isolated from each other by a device isolation region between the transistors TR.

[0066] The active region ACT may be within the substrate 100. The active region ACT may be a portion of the substrate 100. The active region ACT may extend in a first direction (e.g., an x ​​direction) within the substrate 100. A portion of the substrate 100 may be recessed, and the active region ACT may be on the recessed substrate 100. The active region ACT may include a channel region C and a drain region D and a source region S at both sides of the channel region C. Each of the drain region D and the source region S may be a region doped with impurities on the substrate 100 including a semiconductor material. The channel region C may overlap with the gate electrode GE.

[0067] The gate dielectric layer GO may be between the gate electrode GE and the active region ACT. The gate dielectric layer GO may include, for example, silicon oxide (SiO 2 ), silicon nitride (SiN x ), silicon oxynitride (SiON), aluminum oxide (Al 2 O 3 ), titanium oxide (TiO 2 ), Tantalum Oxide (Ta 2 O 5 ), hafnium oxide (HfO 2 ) or zinc oxide (ZnO x ) inorganic insulating material. Zinc oxide (ZnO x ) may be ZnO and / or ZnO 2 .

[0068] The gate electrode GE may be disposed on the active region ACT. The gate electrode GE may intersect the active region ACT and may extend in one direction (e.g., the y direction). The channel region C of the transistor TR may be formed in the active region ACT intersecting the gate electrode GE. That is, the gate electrode GE may overlap the channel region C of the transistor TR. The gate electrode GE may be disposed on the gate dielectric layer GO. The gate electrode GE may include a conductive material. For example, the gate electrode GE may include a metal nitride such as titanium nitride (TiN), tantalum nitride (TAN), or tungsten nitride (WN), or a metal material such as aluminum (Al), tungsten (W), copper (Cu), or molybdenum (Mo), or a semiconductor material such as doped polysilicon. The gate electrode GE may have a multilayer structure or a single-layer structure including the above-mentioned materials.

[0069] The interlayer insulating layer 111 may be disposed on the substrate 100 and may cover the transistor TR. The interlayer insulating layer 111 may include at least one of oxide, nitride, and oxynitride. The interlayer insulating layer 111 may have a single layer structure or a multi-layer structure.

[0070] The drain electrode DE and the source electrode SE may be located on the interlayer insulating layer 111. The drain electrode DE and the source electrode SE may be connected to the drain region D and the source region S of the active region ACT, respectively, through contact holes in the interlayer insulating layer 111. The drain electrode DE and the source electrode SE may include a material with good conductivity. The drain electrode DE and the source electrode SE may include a conductive material including Mo, Al, Cu, Ti, etc., and may have a multilayer structure or a single layer structure including the above materials.

[0071] The through-hole insulating layer 120 may be disposed on the pixel circuit layer 110. The through-hole insulating layer 120 may cover the upper surfaces of the drain electrode DE and the source electrode SE, and have a substantially flat upper surface, and thus may be an organic insulating layer used as a planarization layer. The through-hole insulating layer 120 may include an organic material such as acryl, benzocyclobutene (BCB), or hexamethyldisiloxane (HMDSO). The through-hole insulating layer 120 is shown as having a single-layer structure, but the embodiment is not limited thereto, and the through-hole insulating layer 120 may have a multi-layer structure.

[0072] The display element layer 140 may be disposed on the through hole insulating layer 120. The display element layer 140 may include a first organic light emitting diode OLED1, a second organic light emitting diode OLED2, and a third organic light emitting diode OLED3.

[0073] The first organic light emitting diode OLED1, the second organic light emitting diode OLED2, and the third organic light emitting diode OLED3 may have a stacked structure of a pixel electrode 210, a light emitting layer 220, and an opposing electrode 230. The first organic light emitting diode OLED1, the second organic light emitting diode OLED2, and the third organic light emitting diode OLED3 may be referred to as a first display element, a second display element, and a third display element, respectively. Each of the first organic light emitting diode OLED1, the second organic light emitting diode OLED2, and the third organic light emitting diode OLED3 may emit light having the same peak spectrum. For example, each of the first organic light emitting diode OLED1, the second organic light emitting diode OLED2, and the third organic light emitting diode OLED3 may emit white light. For example, the peak spectrum of each of the first organic light emitting diode OLED1, the second organic light emitting diode OLED2, and the third organic light emitting diode OLED3 may have a peak in a first wavelength range of 435nm to 490nm, a second wavelength range of 500nm to 590nm, and a third wavelength range of 600nm to 710nm. The first, second, and third organic light emitting diodes OLED1, OLED2, and OLED3 may emit light, and regions in which the light is emitted may be defined as first, second, and third emission regions EA1, EA2, and EA3.

[0074] A plurality of pixel electrodes 210 may be disposed on the through-hole insulating layer 120. The plurality of pixel electrodes 210 may be electrically connected to the transistor TR via a contact hole provided in the through-hole insulating layer 120. Each of the pixel electrodes 210 may include a material such as ITO, In 2 O 3 The pixel electrodes 210 may include a transparent conductive layer formed of a transparent conductive oxide such as ITO or IZO and a reflective layer formed of a metal such as Al or Ag. For example, each of the pixel electrodes 210 may have a triple-layer structure of ITO / Ag / ITO.

[0075] like Figure 3 As shown in FIG. 1 , the pixel electrode 210 may include a first pixel electrode 210a, a second pixel electrode 210b, and a third pixel electrode 210c. When viewed in a direction perpendicular to the substrate 100, the first pixel electrode 210a, the second pixel electrode 210b, and the third pixel electrode 210c may be spaced apart from each other.

[0076] The light emitting layer 220 may be disposed on the pixel electrode 210. The light emitting layer 220 may be disposed on the through hole insulating layer 120 to cover the pixel electrode 210. In an embodiment, the light emitting layer 220 may be integrally formed over the plurality of pixel electrodes 210. In another embodiment, the light emitting layer 220 may be patterned to correspond to each of the plurality of pixel electrodes 210.

[0077] The light emitting layer 220 may emit light of a specific color. For example, the light emitting layer 220 may emit white light. The light emitting layer 220 may have a Figure 4 For example, the light emitting layer 220 may have an emission spectrum having peaks in a first wavelength range of 435 nm to 490 nm, a second wavelength range of 500 nm to 590 nm, and a third wavelength range of 600 nm to 710 nm.

[0078] In an embodiment, the light emitting layer 220 may include a polymer or a low molecular weight organic material. The light emitting layer 220 may include an organic light emitting layer. For example, the light emitting layer 220 may include a polymer material based on polyphenylene vinylene (PPV), polyfluorene, etc. The light emitting layer 220 may be formed using screen printing or inkjet printing, laser induced thermal imaging (LITI), etc. However, the embodiment is not limited thereto, and the light emitting layer 220 may include an inorganic light emitting material or a quantum dot.

[0079] In an embodiment, a functional layer (not shown) may be disposed under the light emitting layer 220 and on the light emitting layer 220. The functional layer may include a hole injection layer (HIL), a hole transport layer (HTL), an electron transport layer (ETL), or an electron injection layer (EIL). The functional layer may be integrally formed on the plurality of pixel electrodes 210, or may be patterned to correspond to each of the plurality of pixel electrodes 210.

[0080] The relative electrode 230 may be disposed on the pixel electrode 210 and may overlap with the pixel electrode 210. The relative electrode 230 may be disposed on the light emitting layer 220. The relative electrode 230 may include a conductive material having a low work function. For example, the relative electrode 230 may include a (semi) transparent layer containing silver (Ag), magnesium (Mg), Al, platinum (Pt), palladium (Pd), gold (Au), nickel (Ni), neodymium (Nd), iridium (Ir), chromium (Cr), lithium (Li), calcium (Ca) or an alloy thereof. Optionally, the relative electrode 230 may also include a (semi) transparent layer including the above-mentioned materials such as ITO, IZO, ZnO or In. 2 O 3 The opposing electrode 230 may be integrally formed to completely cover the substrate 100 .

[0081] The pixel defining layer 130 may be disposed on the through-hole insulating layer 120. The pixel defining layer 130 may include an opening 130OP corresponding to the first sub-pixel PX1, the second sub-pixel PX2, and the third sub-pixel PX3. The opening 130OP of the pixel defining layer 130 may expose at least a portion of each of the pixel electrodes 210, for example, a central portion thereof. In an embodiment, the first emission area EA1, the second emission area EA2, and the third emission area EA3 may be defined as an area exposed by the opening 130OP of the pixel defining layer 130. The pixel defining layer 130 may include an organic insulating material and an inorganic insulating material. The pixel defining layer 130 may include an organic material such as polyimide or HMDSO. According to an embodiment, the pixel defining layer 130 may be omitted.

[0082] Spacers (not shown) may be further disposed on the pixel defining layer 130 to prevent damage by the mask. In an embodiment, the spacers may be integrally formed with the pixel defining layer 130. For example, the spacers and the pixel defining layer 130 may be simultaneously formed in the same process by using a half-tone mask process.

[0083] The encapsulation layer 300 may be disposed on the opposite electrode 230. The encapsulation layer 300 may be disposed to cover a plurality of organic light emitting diodes OLED1, OLED2, and OLED3. The encapsulation layer 300 may include at least one inorganic encapsulation layer and at least one organic encapsulation layer. In an embodiment, the encapsulation layer 300 may include a first inorganic encapsulation layer 310, an organic encapsulation layer 320 on the first inorganic encapsulation layer 310, and a second inorganic encapsulation layer 330.

[0084] The first inorganic encapsulation layer 310 and the second inorganic encapsulation layer 330 may include one or more inorganic materials of aluminum oxide, titanium oxide, tantalum oxide, hafnium oxide, zinc oxide, silicon oxide, silicon nitride, and silicon oxynitride. The organic encapsulation layer 320 may include a polymer-based material. The polymer-based material may include an acryl-based resin, an epoxy-based resin, polyimide, polyethylene, etc. In an embodiment, the organic encapsulation layer 320 may include acrylate. The organic encapsulation layer 320 may be formed by hardening a monomer or by coating a polymer. The organic encapsulation layer 320 may have transparency.

[0085] The color filter layer 400 may be disposed on the encapsulation layer 300. The color filter layer 400 may include a first color filter 410, a second color filter 420, and a third color filter 430 through which light of different colors is transmitted. The first color filter 410, the second color filter 420, and the third color filter 430 may be disposed to correspond to the first sub-pixel PX1, the second sub-pixel PX2, and the third sub-pixel PX3. The first sub-pixel PX1, the second sub-pixel PX2, and the third sub-pixel PX3 may include a first display element, a second display element, and a third display element and the first color filter 410, the second color filter 420, and the third color filter 430, respectively. The first color filter 410, the second color filter 420, and the third color filter 430 may be disposed to correspond to the pixel electrode 210 of the first organic light emitting diode OLED1, the second organic light emitting diode OLED2, and the third organic light emitting diode OLED3. For example, the first color filter 410 may be disposed to overlap the first pixel electrode 210a of the first organic light emitting diode OLED1 in a direction perpendicular to the substrate 100 (i.e., the z direction). For example, the second color filter 420 may be disposed to overlap the second pixel electrode 210b of the second organic light emitting diode OLED2 in a direction perpendicular to the substrate 100 (i.e., the z direction). For example, the third color filter 430 may be disposed to overlap the third pixel electrode 210c of the third organic light emitting diode OLED3 in a direction perpendicular to the substrate 100 (i.e., the z direction).

[0086] The first color filter 410, the second color filter 420, and the third color filter 430 may include a photosensitive resin. The first color filter 410, the second color filter 420, and the third color filter 430 may include a pigment or a dye showing an inherent color, respectively.

[0087] Green light, red light, or blue light may be transmitted through each of the first color filter 410 , the second color filter 420 , and the third color filter 430 , respectively.

[0088] For example, the first color filter 410 may be a green color filter through which green light in the light emitted from the light emitting layer 220 is transmitted. The first color filter 410 may have a transmission spectrum having a first transmittance in a wavelength range of about 510nm to about 550nm and a second transmittance in a wavelength range of about 630nm to about 660nm. In this case, the second transmittance of the first color filter 410 may be less than the first transmittance. The second transmittance of the first color filter 410 in a wavelength range of about 630nm to about 660nm may be greater than 0. The first transmittance may be a transmittance in a first peak wavelength of the light emitting layer 220, and the second transmittance may be a transmittance in a second peak wavelength of the light emitting layer 220. The first peak wavelength of the light emitting layer 220 may be a wavelength in a wavelength range of about 510nm to about 550nm. The second peak wavelength of the light emitting layer 220 may be a wavelength in a wavelength range of about 630nm to about 660nm.

[0089] For example, the ratio of the first transmittance to the second transmittance of the first color filter 410 may be 1:0.01 to 1:0.3. In other words, the ratio of the first transmittance in the first peak wavelength of the light-emitting layer 220 of the first color filter 410 to the second transmittance in the second peak wavelength of the light-emitting layer 220 of the first color filter 410 may be 1:0.01 to 1:0.3. For example, the ratio of the first transmittance to the second transmittance of the first color filter 410 may be 1:0.01 to 1:0.1. For example, the ratio of the first transmittance to the second transmittance of the first color filter 410 may be 1:0.01 to 1:0.07. For example, the first transmittance of the first color filter 410 may be about 80% to about 99%. For example, the first transmittance of the first color filter 410 may be about 80% to about 95%. When the first transmittance is 80% or less, the color purity may be reduced. For example, the second transmittance of the first color filter 410 may be about 1% to about 20%. For example, the second transmittance of the first color filter 410 may be about 1% to about 10%. For example, the second transmittance of the first color filter 410 may be about 1% to about 8%. For example, the second transmittance of the first color filter 410 may be about 2% to about 6%. When the first transmittance and the second transmittance of the first color filter 410 satisfy the above range, the display device 1 can achieve a high resolution of about 4000ppi. When the first transmittance and the second transmittance of the first color filter 410 satisfy the above range, in the green color coordinates of the light emitted from the display device 1, the x coordinate may have a range of 0.220 to 0.240, and the y coordinate may have a range of 0.720 to 0.740.

[0090] For example, the second color filter 420 may be a red color filter through which red light among the light emitted from the light emitting layer 220 is selectively transmitted. For example, light having a wavelength belonging to about 600 nm to about 710 nm may be transmitted through the second color filter 420.

[0091] For example, the third color filter 430 may be a blue color filter through which blue light among the light emitted from the light emitting layer 220 is selectively transmitted. For example, light having a wavelength belonging to about 430 nm to about 490 nm may be transmitted through the third color filter 430.

[0092] In an embodiment, the display device 1 may overlap the first color filter 410, the second color filter 420, and the third color filter 430 to define the light shielding portion BM. In another embodiment, the display device 1 may further include an additional light shielding layer including a light shielding material instead of forming the light shielding portion BM by overlapping the first color filter 410, the second color filter 420, and the third color filter 430.

[0093] In an implementation, the display device 1 may further include an overcoat layer 500 on the color filter layer 400. The overcoat layer 500 may include a colorless transparent material.

[0094] Figure 4 is a graph showing an emission spectrum of a light emitting layer 220 of an organic light emitting diode (OLED) OLED in the display device 1 according to an embodiment.

[0095] refer to Figure 4 , the light emitting layer 220 may emit light having a peak intensity in a first wavelength range of about 435 nm to about 490 nm, a second wavelength range of about 500 nm to about 590 nm, and a third wavelength range of about 600 nm to about 710 nm. That is, the above reference Figure 3 Each of the described first organic light emitting diode OLED1, second organic light emitting diode OLED2, and third organic light emitting diode OLED3 may emit light having a peak intensity in a first wavelength range of about 435 nm to about 490 nm, a second wavelength range of about 500 nm to about 590 nm, and a third wavelength range of about 600 nm to about 710 nm. Each of the first organic light emitting diode OLED1, second organic light emitting diode OLED2, and third organic light emitting diode OLED3 may emit the same white light.

[0096] Figure 5 is a graph schematically showing a transmission spectrum of the first color filter 410 according to the embodiment and the comparative example. Figure 5 The above reference shows Figure 4 The emission spectrum of the light emitting layer 220 of the organic light emitting diode OLED is described. Figure 6It is shown that the above reference Figure 5 Graphs of color coordinates of the display device 1 according to the first color filter 410 of the embodiment and the comparative example are described.

[0097] exist Figure 5 , the spectrum of light emitted from the light emitting layer 220 of the organic light emitting diode OLED corresponds to the right y coordinate (intensity of light). In addition, the transmission spectrum of the first color filter 410 according to the embodiment corresponds to the left y coordinate (transmittance).

[0098] refer to Figure 5 , each of the first color filters 410 according to Embodiments 1 to 3 may have a transmittance of 80% or more in a wavelength range of 510nm to 550nm. In addition, each of the first color filters 410 according to Embodiments 1 to 3 may have a transmittance of 0% to 20% or more in a wavelength range of 630nm to 660nm. On the other hand, the first color filter 410 according to the comparative example may have a transmittance of 80% or more in a wavelength range of 510nm to 550nm, and light in a wavelength range of 630nm to 660nm is not transmitted through the first color filter 410 according to the comparative example.

[0099] The first color filter 410 according to Embodiment 1 may have a transmittance of about 83% to about 91% in a wavelength range of 510nm to 550nm, and a transmittance of about 4.8% to about 6.6% in a wavelength range of 630nm to 660nm. The first color filter 410 according to Embodiment 2 may have a transmittance of about 85% to about 92% in a wavelength range of 510nm to 550nm, and a transmittance of about 1.0% to about 3.5% in a wavelength range of 630nm to 660nm. The first color filter 410 according to Embodiment 3 may have a transmittance of about 85% to about 92% in a wavelength range of 510nm to 550nm, and a transmittance of about 4.6% to about 6.5% in a wavelength range of 630nm to 660nm. The first color filter 410 according to the comparative example may have a transmittance of about 85% to about 92% within a wavelength range of 510 nm to 550 nm, and may have a transmittance of 0% within a wavelength range of 630 nm to 660 nm.

[0100] Specifically, the first color filter 410 according to Embodiment 1 may have a transmittance of 91.0% at 530 nm, which is the first peak wavelength of the light emitting layer 220, and a transmittance of 4.94% at 640 nm, which is the second peak wavelength of the light emitting layer 220. The first color filter 410 according to Embodiment 2 may have a transmittance of 91.7% at 530 nm, which is the first peak wavelength of the light emitting layer 220, and a transmittance of 2.08% at 640 nm, which is the second peak wavelength of the light emitting layer 220. The first color filter 410 according to Embodiment 3 may have a transmittance of 91.7% at 530 nm, which is the first peak wavelength of the light emitting layer 220, and a transmittance of 4.98% at 640 nm, which is the second peak wavelength of the light emitting layer 220. The first color filter 410 according to the comparative example may have a transmittance of 91.7% at 530 nm, which is a first peak wavelength of the light emitting layer 220 , and a transmittance of 0% at 640 nm, which is a second peak wavelength of the light emitting layer 220 .

[0101] According to Embodiment 1, a ratio of the transmittance of the first color filter 410 in the wavelength range of 510 nm to 550 nm to the transmittance of the first color filter 410 in the wavelength range of 630 nm to 660 nm may be about 1:0.053 to about 1:0.080. According to Embodiment 2, a ratio of the transmittance of the first color filter 410 in the wavelength range of 510 nm to 550 nm to the transmittance of the first color filter 410 in the wavelength range of 630 nm to 660 nm may be about 1:0.011 to about 1:0.041. According to Embodiment 3, a ratio of the transmittance of the first color filter 410 in the wavelength range of 510 nm to 550 nm to the transmittance of the first color filter 410 in the wavelength range of 630 nm to 660 nm may be about 1:0.050 to about 1:0.076.

[0102] According to Embodiment 1, the ratio of the transmittance of the light emitting layer 220 of the first color filter 410 at 530 nm as the first peak wavelength to the transmittance of the light emitting layer 220 of the first color filter 410 at 640 nm as the second peak wavelength may be about 1:0.054. According to Embodiment 2, the ratio of the transmittance of the light emitting layer 220 of the first color filter 410 at 530 nm as the first peak wavelength to the transmittance of the light emitting layer 220 of the first color filter 410 at 640 nm as the second peak wavelength may be about 1:0.023. According to Embodiment 3, the ratio of the transmittance of the light emitting layer 220 of the first color filter 410 at 530 nm as the first peak wavelength to the transmittance of the light emitting layer 220 of the first color filter 410 at 640 nm as the second peak wavelength may be about 1:0.054.

[0103] Figure 6 It is shown that according to the above reference Figure 5 Graphs of color coordinates of the display device 1 including the first color filter 410 of the described embodiment and comparative example. Figure 6 , the color coordinates of the display device 1 including the light emitting layer 220 and the first color filter 410 are shown, and the light emitting layer 220 emits the above reference Figure 4 The peak intensity of white light described above, the first color filter 410 has the above reference Figure 5 Describe the transmission spectrum. Figure 6 The color coordinates of are based on the International Commission on Illumination (CIE) color coordinates.

[0104] refer to Figure 6 , the color coordinates (x, y) according to Embodiment 1 are (0.233, 0.729). The color coordinates (x, y) according to Embodiment 2 are (0.231, 0.733). The color coordinates (x, y) according to Embodiment 3 are (0.234, 0.727). The color coordinates (x, y) according to the comparative example are (0.230, 0.735).

[0105] When the light emitting layer 220 emits white light, as in the comparative example, when only light in the green wavelength range of 510 nm to 550 nm is transmitted, the color coordinates are arranged on the left side of the graph and have a relatively green color. Figure 6 In the embodiment, as in Embodiment 1 to Embodiment 3, when a portion of light in the wavelength range of 630nm to 660nm is transmitted, the color coordinates move to the right side of the graph. Therefore, according to the embodiment, as in Embodiment 1 to Embodiment 3, light may have a first transmittance in the wavelength range of 510nm to 550nm and a second transmittance in the wavelength range of 630nm to 660nm.

[0106] When the first transmittance in the wavelength range of 510 nm to 550 nm is 80% or more and the ratio of the first transmittance in the wavelength range of 510 nm to 550 nm to the second transmittance in the wavelength range of 630 nm to 660 nm is about 1:0.01 to about 1:0.1, as Figure 6 As shown in , in the color coordinates, the x coordinate may be in the range of 0.220 to 0.240, and the y coordinate may be in the range of 0.720 to 0.740.

[0107] The color coordinates (x, y) of DCI-P3 are (0.265, 0.690). When the first transmittance in the wavelength range of 510nm to 550nm is 90% or more and the ratio of the first transmittance in the wavelength range of 510nm to 550nm to the second transmittance in the wavelength range of 630nm to 660nm is about 1:0.3, the color coordinates (x, y) are (0.266, 0.701). When the first transmittance is 80% or more and the ratio of the first transmittance to the second transmittance is 1:0.01 to 1:0.3, in the color coordinates, the x coordinate may be in the range of 0.220 to 0.270, and the y coordinate may be in the range of 0.680 to 0.740.

[0108] For example, the x coordinate of the color coordinate according to the embodiment may be in the range of 0.020 to 0.270, and the y coordinate may be in the range of 0.680 to 0.740. For example, the x coordinate of the color coordinate according to the embodiment may be in the range of 0.220 to 0.266, and the y coordinate may be in the range of 0.690 to 0.740. For example, the x coordinate of the color coordinate according to the embodiment may be in the range of 0.022 to 0.240, and the y coordinate may be in the range of 0.720 to 0.740.

[0109] Therefore, unlike light emitted by a display device including a color filter through which only light in the green wavelength range is transmitted having a relatively green color, when the first transmittance is 80% or greater and the ratio of the first transmittance to the second transmittance has a range of 1:0.01 to 1:0.3, the color coordinates can be designed to move relatively to the right and converge into a target color.

[0110] In a display device according to an embodiment, an OLED emitting white light can be designed to have a transmission spectrum of a first color filter corresponding to a green sub-pixel, the transmission spectrum having a first transmittance in a wavelength range of 510nm to 550nm and a second transmittance in a wavelength range of 630nm to 660nm, so that excellent color reproduction can be achieved. Of course, the scope of the present disclosure is not limited by these effects.

[0111] It should be understood that the embodiments described herein should be considered to be descriptive only and not for limiting purposes. The description of features or aspects within each embodiment should generally be considered to be applicable to other similar features or aspects in other embodiments. Although one or more embodiments have been described with reference to the accompanying drawings, it will be understood by those of ordinary skill in the art that various changes in form and detail may be made therein without departing from the spirit and scope as defined by the appended claims.

Claims

1. A display device, comprising: substrate; a display element layer disposed on the substrate and comprising a first display element, a second display element and a third display element, wherein the first display element, the second display element and the third display element each emit light having the same peak spectrum; as well as a color filter layer disposed on the display element layer and comprising a first color filter disposed on the first display element, a second color filter disposed on the second display element, and a third color filter disposed on the third display element, wherein the first color filter has a transmission spectrum having a first transmittance in a wavelength range of 510 nm to 550 nm inclusive and a second transmittance in a wavelength range of 630 nm to 660 nm inclusive, and A ratio of the first transmittance to the second transmittance is in a range of 1:0.01 to 1:0.3, inclusive.

2. The display device according to claim 1, wherein: The first transmittance is in the range of 80% to 99% inclusive.

3. The display device according to claim 1, wherein: The second transmittance is in the range of 1% to 20% inclusive.

4. The display device according to claim 1, wherein: a first subpixel includes the first display element and the first color filter, a second subpixel includes the second display element and the second color filter, and a third subpixel includes the third display element and the third color filter, and In color coordinates based on the International Commission on Illumination color coordinates, the x coordinate of the light emitted by the first subpixel is in the range of 0.220 to 0.270, inclusive, and the y coordinate of the light emitted by the first subpixel is in the range of 0.680 to 0.740, inclusive.

5. The display device according to claim 1, wherein: The first display element, the second display element and the third display element each emit white light, and each of the first display element, the second display element and the third display element has a peak in a first wavelength range of 435nm to 490nm including 435nm and 490nm, a second wavelength range of 500nm to 590nm including 500nm and 590nm, and a third wavelength range of 600nm to 710nm including 600nm and 710nm.

6. A display device comprising: substrate; A display element layer is disposed on the substrate and includes a first display element, a second display element, and a third display element, wherein the first display element, the second display element, and the third display element each emit white light; as well as a color filter layer disposed on the display element layer and comprising a first color filter disposed on the first display element, a second color filter disposed on the second display element, and a third color filter disposed on the third display element, wherein the first color filter has a transmission spectrum having a first transmittance in a wavelength range of 510 nm to 550 nm inclusive and a second transmittance in a wavelength range of 630 nm to 660 nm inclusive, and The first transmittance is in the range of 80% to 99% inclusive.

7. The display device according to claim 6, wherein: A ratio of the first transmittance to the second transmittance is in a range of 1:0.01 to 1:0.3, inclusive.

8. The display device according to claim 6, wherein: The second transmittance is in the range of 1% to 20% inclusive.

9. The display device according to claim 6, wherein: a first subpixel includes the first display element and the first color filter, a second subpixel includes the second display element and the second color filter, and a third subpixel includes the third display element and the third color filter, and In color coordinates based on the International Commission on Illumination color coordinates, the x coordinate of the light emitted by the first subpixel is in the range of 0.220 to 0.270, inclusive, and the y coordinate of the light emitted by the first subpixel is in the range of 0.680 to 0.740, inclusive.

10. A display device, comprising: Semiconductor substrate; a display element layer disposed on the substrate and comprising a first display element, a second display element and a third display element, wherein the first display element, the second display element and the third display element each emit light having the same peak spectrum; as well as a color filter layer disposed on the display element layer and comprising a first color filter disposed on the first display element, a second color filter disposed on the second display element, and a third color filter disposed on the third display element, wherein the first color filter has a transmission spectrum having a first transmittance in a wavelength range of 510 nm to 550 nm inclusive and a second transmittance in a wavelength range of 630 nm to 660 nm inclusive, and A ratio of the first transmittance to the second transmittance is in a range of 1:0.01 to 1:0.3, inclusive, a first subpixel includes the first display element and the first color filter, a second subpixel includes the second display element and the second color filter, and a third subpixel includes the third display element and the third color filter, and In color coordinates based on the International Commission on Illumination color coordinates, the x coordinate of the light emitted by the first subpixel is in the range of 0.220 to 0.270, inclusive, and the y coordinate of the light emitted by the first subpixel is in the range of 0.680 to 0.740, inclusive.

Images