Color conversion panel and display device including the same

Abstract

A color conversion panel and a display device including the same are provided. The color conversion panel according to an embodiment can include a partition wall disposed on a substrate, a reflective layer disposed on an outer surface of the partition wall, a cover layer disposed on an outer surface of the reflective layer and having a water-proof property, a spacer overlapping a portion of the partition wall and protruding from a portion of the cover layer, the spacer and the cover layer being formed on the same layer, and a color conversion layer disposed on the cover layer and disposed in an area defined by the partition wall.

Description

[0001] This application claims priority and benefit to Korean Patent Application No. 10-2020-0047558, filed on April 20, 2020, with the Korean Intellectual Property Office, the entire contents of which are incorporated herein by reference. Technical Field

[0002] The disclosure relates to a color conversion panel, a display device including the color conversion panel, and a method for manufacturing the same. Background Technology

[0003] A color conversion panel and a display device including the color conversion panel have been proposed to reduce light loss in a flat panel display and display colors with high efficiency.

[0004] It is necessary to improve the efficiency of light conversion in the color conversion panel, while effectively manufacturing the color conversion layer.

[0005] When the gap between the display panel and the color conversion panel of the display device is not constant, the display quality will deteriorate, and the brightness will change depending on the position of the gap.

[0006] The manufacturing of color conversion panels requires photolithography, and the manufacturing cost increases as the number of exposure masks used in the photolithography process increases.

[0007] The information disclosed in this background section is only intended to enhance the understanding of the background art of the invention, and therefore may contain information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0008] The embodiments provide a color conversion panel that can improve the color conversion efficiency of the color conversion panel and maintain a constant gap between the display panel and the color conversion panel of the display device, a display device including the color conversion panel, and a manufacturing method that can prevent the increase in manufacturing costs by reducing the number of exposure masks in the manufacturing process.

[0009] The invention is not limited to the above objectives, and the disclosure can be extended in various ways without departing from the spirit and scope of the invention.

[0010] The color conversion panel according to an embodiment may include: a partition wall disposed on a substrate; a reflective layer disposed on the outer surface of the partition wall; a cover layer disposed on the outer surface of the reflective layer and having waterproof properties; a spacer partially overlapping the partition wall and protruding from a portion of the cover layer, the spacer and the cover layer being formed on the same layer; and a color conversion layer disposed on the cover layer and disposed in the area defined by the partition wall.

[0011] Color conversion layers can include quantum dots.

[0012] The color conversion panel may also include a transparent color filter layer disposed on the cover layer and in the area defined by the partition wall, and transmitting light of a first wavelength.

[0013] The color conversion layer may include: a first color conversion layer that converts light of a first wavelength into light of a second wavelength; and a second color conversion layer that converts light of the first wavelength into light of a third wavelength that is different from light of the second wavelength.

[0014] The color conversion panel may also include a blocking layer disposed between the substrate and the first color conversion layer and the second color conversion layer, wherein the blocking layer can absorb light of the first wavelength.

[0015] The color conversion panel may further include a first color filter, a second color filter, and a third color filter disposed between the substrate and the transparent color filter layer, the first color conversion layer, and the second color conversion layer. The first color filter may be stacked with the transparent color filter layer and transmits light of a first wavelength. The second color filter may be stacked with the first color conversion layer and transmits light of a second wavelength. The third color filter may be stacked with the second color conversion layer and transmits light of a third wavelength.

[0016] A display device according to an embodiment may include: a display panel including a first substrate; a second substrate facing the first substrate; a partition wall disposed between the first substrate and the second substrate; a reflective layer disposed on the outer surface of the partition wall; a cover layer disposed on the outer surface of the reflective layer and having waterproof properties; a spacer overlapping a portion of the partition wall and protruding from a portion of the cover layer, the spacer and the cover layer being formed on the same layer; and a color conversion layer adjacent to the cover layer and disposed in the area defined by the partition wall.

[0017] The display panel may include organic light-emitting diodes (OLEDs), and the OLEDs may emit light of a first wavelength.

[0018] Color conversion layers can include quantum dots.

[0019] The display device may also include a transparent color filter layer disposed on the cover layer and in the area defined by the partition wall, the transparent color filter layer transmitting light of a first wavelength.

[0020] The color conversion layer may include: a first color conversion layer that converts light of a first wavelength into light of a second wavelength; and a second color conversion layer that converts light of the first wavelength into light of a third wavelength that is different from light of the second wavelength.

[0021] The display device may further include a blocking layer disposed between the second substrate and the first color conversion layer and the second color conversion layer. The blocking layer can absorb light of the first wavelength.

[0022] The display device may further include a first color filter, a second color filter, and a third color filter disposed between the second substrate and the transparent color filter layer, the first color conversion layer, and the second color conversion layer. The first color filter may be stacked with the transparent color filter layer and transmits light of a first wavelength. The second color filter may be stacked with the first color conversion layer and transmits light of a second wavelength. The third color filter may be stacked with the second color conversion layer and transmits light of a third wavelength.

[0023] The color conversion panel forming method according to an embodiment may include the following steps: forming a partition wall on a substrate; disposing a metal layer and a waterproof layer on the substrate; forming a cover layer on the partition wall by patterning the waterproof layer with an exposure mask comprising three regions and forming spacers protruding from a portion of the cover layer, each of the three regions having a different light transmittance; etching the metal layer using the cover layer and spacers as a mask to form a reflective layer disposed between the partition wall and the cover layer; and forming a color conversion layer disposed on the cover layer in the region defined by the partition wall.

[0024] The waterproof layer may include transparent organic components and may be waterproof.

[0025] The color conversion layer can be formed using inkjet printing.

[0026] The three areas of the exposure mask may include a first area where the waterproof layer is completely removed, a second area with partition walls, and a third area with spacers.

[0027] The covering layer and spacers may include transparent organic components and may be waterproof.

[0028] The metal layer may include reflective metal.

[0029] Color conversion layers can include quantum dots.

[0030] According to an embodiment, the color conversion panel and the display device including the color conversion panel can improve the color conversion efficiency of the color conversion panel and maintain a constant gap between the display panel and the color conversion panel of the display device. The number of exposure masks in the manufacturing process can be reduced, thereby preventing an increase in manufacturing costs.

[0031] The effects of the present invention are not limited to those described above. Obviously, various extensions can be made without departing from the spirit and scope of the present invention. Attached Figure Description

[0032] Figure 1 This is a schematic cross-sectional view of a display device according to an embodiment.

[0033] Figure 2This is a schematic cross-sectional view of the color conversion panel according to an embodiment.

[0034] Figures 3 to 11 This is a schematic cross-sectional view of a method for manufacturing a color conversion panel according to a manufacturing sequence, based on an embodiment.

[0035] Figure 12 This is a schematic cross-sectional view of a display device according to another embodiment. Detailed Implementation

[0036] The invention will be described more fully below with reference to the accompanying drawings, in which embodiments of the invention are illustrated. As those skilled in the art will recognize, the described embodiments may be modified in various ways without departing entirely from the spirit or scope of the invention.

[0037] For the sake of clear description of the invention, parts that are not relevant to the description have been omitted, and throughout the specification, the same reference numerals denote the same or similar elements.

[0038] Because the dimensions and thicknesses of each component shown in the accompanying drawings are arbitrary for better understanding and ease of description, the invention is not limited to what is shown. In the drawings, the thicknesses of layers, films, panels, regions, etc., are exaggerated for clarity. In the drawings, the thicknesses of some layers and regions may be exaggerated for better understanding and ease of description.

[0039] What will be understood is that when an element (such as a layer, film, region, or substrate) is referred to as being "on" another element, the element may be directly on said other element, or there may be an intermediate element present. Conversely, when an element is referred to as being "directly on" another element, there is no intermediate element present. The terms "on" or "above" mean located on or below a portion of an object, and do not necessarily mean located on the upper side of the object based on the direction of gravity.

[0040] Unless explicitly stated otherwise, the terms “comprising,” “having,” “including,” and “including” are used in this specification to indicate the presence of the stated features, areas, integrals, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, areas, integrals, steps, operations, elements, components, and / or groups thereof.

[0041] Furthermore, in this specification, the phrase "in a plane" means viewing the target portion from the top, and the phrase "in a cross section" means viewing a cross section formed by cutting the target portion vertically from the side.

[0042] Throughout this specification, it will be understood that when an element is referred to as being associated with another element (e.g., “bonded to,” “connected to,” or “in contact with” another element), the element may be directly bonded to, connected to, or in contact with said other element, or there may be an intermediate element between the element and said other element. Conversely, it should be understood that when an element is referred to as being associated with another element (e.g., “directly bonded to,” “directly connected to,” or “directly in contact with” another element), there is no intermediate element. Other expressions explaining relationships between elements (e.g., “between,” “directly between,” “adjacent,” or “immediately adjacent”) should be interpreted in the same manner.

[0043] It will be understood that although the terms “first,” “second,” “third,” etc., may be used herein to describe various elements, components, regions, layers, and / or parts, these elements, components, regions, layers, and / or parts should not be limited by these terms. These terms are used only to distinguish one element, component, region, layer, or part from another. Therefore, without departing from the teaching herein, “first element,” “first component,” “first region,” “first layer,” or “first part” discussed below may be referred to as a second element, second component, second region, second layer, or second part.

[0044] As used herein, the terms “about” or “approximately” include the stated value and mean: within an acceptable deviation of the particular value, taking into account the measurement in question and the error associated with the measurement of the particular quantity (i.e., limitations of the measurement system), as determined by a person skilled in the art. For example, “about” may mean within one or more standard deviations, or within ±20%, ±10%, or ±5% of the stated value.

[0045] Reference Figure 1 The display device according to an embodiment will be described schematically. Figure 1 This is a schematic cross-sectional view of a display device according to an embodiment.

[0046] Reference Figure 1 The display device according to an embodiment includes a display panel 1000 and a color conversion panel 2000. Although not shown, the display device may also include a touch portion, and the touch portion may be disposed between the display panel 1000 and the color conversion panel 2000.

[0047] The description will be for display panel 1000.

[0048] The display panel 1000 includes a first substrate 110, and a buffer layer 121 is disposed on the first substrate 110. The first substrate 110 may include a flexible material (e.g., plastic), and therefore the first substrate 110 may be flexible, bendable, foldable, or rollable.

[0049] Buffer layer 121 may include silicon nitride (SiN) x ) or silicon dioxide (SiO) x The buffer layer 121 can be disposed between the first substrate 110 and the semiconductor layer 154, thereby improving the properties of polysilicon by blocking impurities from the first substrate 110 during the crystallization process to form polysilicon, and planarizing the first substrate 110 to reduce the stress on the semiconductor layer 154 formed on the buffer layer 121.

[0050] A semiconductor layer 154 is disposed on the buffer layer 121. The semiconductor layer 154 may be formed of polysilicon or oxide semiconductor. The semiconductor layer 154 includes a channel region 152, a source region 151, and a drain region 153. The source region 151 and the drain region 153 are disposed on opposite sides of the channel region 152. The channel region 152 is an intrinsic semiconductor without impurities, and the source region 151 and the drain region 153 are impurity semiconductors doped with conductive impurities. The semiconductor layer 154 may be formed of oxide semiconductor, and a separate passivation layer (not shown) may be added to protect the semiconductor oxide material from external environmental factors (such as high temperatures).

[0051] A gate insulating layer 122 is disposed on the semiconductor layer 154 to cover the semiconductor layer 154. The gate insulating layer 122 may include silicon nitride (SiN). x It is a single layer or multiple layers of at least one of silicon dioxide (SiO2).

[0052] The gate electrode 155 is disposed on the gate insulating layer 122. The gate electrode 155 may be a multilayer structure made of metal films including copper (Cu), copper alloy, aluminum (Al), aluminum alloy, molybdenum (Mo), and molybdenum alloy.

[0053] An interlayer insulating layer 123 is disposed on the gate electrode 155 and the gate insulating layer 122. The interlayer insulating layer 123 may include silicon nitride (SiN). x (or silicon dioxide (SiO2)). The openings of the exposed source region 151 and drain region 153 can be provided in the interlayer insulating layer 123.

[0054] Source electrode 161 and drain electrode 162 are formed on interlayer insulating layer 123. Source electrode 161 and drain electrode 162 are connected to source region 151 and drain region 153 of semiconductor layer 154 through openings formed in interlayer insulating layer 123 and gate insulating layer 122, respectively.

[0055] A passivation layer 180 is disposed on the interlayer insulating layer 123, the source electrode 161, and the drain electrode 162. The passivation layer 180 can planarize the interlayer insulating layer 123, the source electrode 161, and the drain electrode 162 by covering them, thus allowing the pixel electrode 191 to be formed on the passivation layer 180 without creating steps. Such a passivation layer 180 can be made of organic materials (such as polyacrylic resins or polyimide resins) or a laminate of organic and inorganic materials.

[0056] Pixel electrode 191 is disposed on passivation layer 180. Pixel electrode 191 can be connected to drain electrode 162 through openings in passivation layer 180.

[0057] A driving transistor formed by a gate electrode 155, a semiconductor layer 154, a source electrode 161, and a drain electrode 162 is connected to a pixel electrode 191, thereby supplying driving current to the organic light-emitting diode (OLED). Besides Figure 1 In addition to the driving transistor shown, the display device according to the embodiment may also include a switching transistor (not shown) and a compensation transistor (not shown). The switching transistor may be connected to a data line and may transmit a data voltage in response to a scan signal. The compensation transistor is connected to the driving transistor and compensates for the threshold voltage of the driving transistor in response to a scan signal.

[0058] A pixel defining layer 360 is disposed on the passivation layer 180 and the pixel electrode 191, and may include a pixel opening 365 superimposed on the pixel electrode 191 and defining a light emitting region. The pixel defining layer 360 may comprise an organic material (such as polyacrylic resin and polyimide resin) or a silicon-based inorganic material. The pixel opening 365 may have a planar shape similar to that of the pixel electrode 191. The pixel opening 365 may have a rhomboid or octagonal shape, but is not limited to these, and may have any shape (such as a quadrilateral, polygon, etc.).

[0059] An organic emitting layer 370 is disposed on the pixel electrode 191, which is stacked with the pixel opening 365. The organic emitting layer 370 may be made of a low-molecular-weight organic material or a high-molecular-weight organic material (e.g., PEDOT (poly(3,4-ethylenedioxythiophene))).

[0060] The organic emitter layer 370 can be one or more of the following multilayers: hole injection layer (HIL), hole transport layer (HTL), electron transport layer (ETL), and electron injection layer (EIL).

[0061] The organic emission layer 370 can be mainly disposed in the pixel opening 365, and can also be disposed on the side or above the pixel limiting layer 360.

[0062] A common electrode 271 is disposed on the organic emission layer 370. The common electrode 271 can be disposed above a pixel and can receive a common voltage through a common voltage transmission portion (not shown) in a non-display area.

[0063] The pixel electrode 191, the organic emission layer 370, and the common electrode 271 can form an organic light-emitting diode (OLED).

[0064] Pixel electrode 191 can be an anode serving as a hole injection electrode, and common electrode 271 can be a cathode serving as an electron injection electrode. However, the embodiments are not limited thereto; according to the driving method of an organic light-emitting diode (OLED) display, pixel electrode 191 can be a cathode, and common electrode 271 can be an anode.

[0065] Holes and electrons can be injected into the organic emission layer 370 from the pixel electrode 191 and the common electrode 271, respectively, and light emission can be performed when the excitons generated by the injected holes and electrons combine and fall from the excited state to the ground state.

[0066] The encapsulation layer 390 is disposed on the common electrode 271. The encapsulation layer 390 can encapsulate the display layer including the organic light-emitting diode (OLED), and covers not only the top surface of the display layer, but also the side surface of the display layer.

[0067] Because organic light-emitting diodes (OLEDs) are highly susceptible to moisture and oxygen, the encapsulation layer 390 blocks the introduction of external moisture and oxygen by encapsulating the display layer. The encapsulation layer 390 may include multiple layers and may be formed from a composite layer comprising inorganic and organic layers. For example, the encapsulation layer 390 may be configured to have three layers, wherein an inorganic layer, an organic layer, and an inorganic layer are sequentially formed.

[0068] The color conversion panel 2000 is located on the encapsulation layer 390.

[0069] The color conversion panel 2000 includes a second substrate 210 facing a first substrate 110 of the display panel 1000. The second substrate 210 may include a flexible material (such as plastic) so that it is flexible, bendable, foldable, or rollable.

[0070] A light-blocking component 220, a first color filter 230a, a second color filter 230b, a third color filter 230c, a first insulating layer 240a, a partition wall 250, a reflective layer 260, a cover layer 270, a spacer 270a, a transparent color filter layer 300a, a first color conversion layer 300b, a second color conversion layer 300c, and a second insulating layer 240b are disposed between the second substrate 210 and the display panel 1000, and a filler layer 280 is disposed between the second insulating layer 240b and the display panel 1000. The light-blocking layer 220a is disposed between the second substrate 210 and the second color filter 230b and the third color filter 230c.

[0071] The light-blocking member 220, the partition wall 250, the reflective layer 260, and the cover layer 270 can be configured to be stacked with the pixel defining layer 360 of the display panel 1000. For example, the light-blocking member 220, the partition wall 250, the reflective layer 260, and the cover layer 270 are configured to be stacked with the opaque area of ​​the display panel 1000, and the transparent color filter layer 300a, the first color conversion layer 300b, and the second color conversion layer 300c are configured to be stacked with the light emitting area of ​​the display panel 1000. Multiple partition walls 250, reflective layers 260, and cover layers 270 are provided, and a portion of the cover layer 270 includes spacers 270a protruding therefrom.

[0072] A transparent color filter layer 300a, a first color conversion layer 300b, and a second color conversion layer 300c are disposed in the area surrounded by a partition wall 250.

[0073] An organic light-emitting diode (OLED) can emit light of a first wavelength, and a transparent color filter layer 300a may include a scatterer 301a. A first color conversion layer 300b converts the light of the first wavelength entering from the display panel 1000 into light of a second wavelength, and includes the scatterer 301a and a first quantum dot 301b. A second color conversion layer 300c converts the light of the first wavelength entering from the display panel 1000 into light of a third wavelength, and includes the scatterer 301a and a second quantum dot 301c.

[0074] The first wavelength of light can be blue light in the range of approximately 380 nm to approximately 480 nm. For example, the maximum light emission peak wavelength can be approximately 420 nm or greater, approximately 430 nm or greater, approximately 440 nm or greater, or approximately 445 nm or greater and approximately 470 nm or less, approximately 460 nm or less, or approximately 455 nm or less.

[0075] The second wavelength of light can be green light with a maximum emission peak wavelength in the range of about 500 nm to about 550 nm. For example, the maximum emission peak wavelength can be in the range of about 510 nm to about 550 nm.

[0076] The third wavelength of light can be red light with a peak emission wavelength in the range of approximately 600 nm to approximately 650 nm. For example, the maximum peak emission wavelength can be in the range of approximately 620 nm to approximately 650 nm.

[0077] The first color filter 230a transmits light of a first wavelength that has passed through the transparent color filter layer 300a and absorbs light of other wavelengths, thereby increasing the purity of the first wavelength light emitted toward the second substrate 210 after passing through the transparent color filter layer 300a. The second color filter 230b transmits light of a second wavelength and absorbs light of other wavelengths, thereby increasing the purity of the second wavelength light emitted toward the second substrate 210 after passing through the first color conversion layer 300b. The third color filter 230c transmits light of a third wavelength and absorbs light of other wavelengths, thereby increasing the purity of the third wavelength light emitted toward the second substrate 210 after passing through the second color conversion layer 300c.

[0078] The blocking layer 220a is disposed at a position where it overlaps with the first color conversion layer 300b and the second color conversion layer 300c, and can block (e.g., absorb) the light of the first wavelength that remains in the first color conversion layer 300b and the second color conversion layer 300c and is therefore emitted toward the second substrate 210, thereby increasing the purity of the second wavelength light passing through the first color conversion layer 300b and the second color conversion layer 300c and the purity of the third wavelength light, respectively.

[0079] The blocking layer 220a can substantially block (e.g., absorb) light of a first wavelength and can transmit light of other wavelengths. For example, the blocking layer 220a substantially blocks blue light in the range of about 500 nm or less and can transmit light in the remaining visible light wavelength range greater than about 500 nm and less than 700 nm. For example, the blocking layer 220a can absorb about 80% or more, about 90% or more, or about 95% or more of blue light in the range of about 500 nm or less, and can have about 70% or more, about 80% or more, about 90% or more, or about 100% transmittance with respect to the remaining visible light in the range of about 500 nm to about 700 nm.

[0080] Light passing through the transparent color filter layer 300a, the first color conversion layer 300b, and the second color conversion layer 300c can be reflected by the reflective layer 260 surrounding the outer surface of the partition wall 250, and thus emitted to the outside, thereby increasing light efficiency. For example, compared to the case where no reflective layer 260 is provided, the light efficiency can be increased by at least about 20%.

[0081] The cover layer 270 covering the reflective layer 260 is waterproof, so when the transparent color filter layer 300a, the first color conversion layer 300b and the second color conversion layer 300c are formed by inkjet printing, the cover layer 270 can help the inkjet solution to be placed inside the area defined by the partition wall 250 rather than above the partition wall 250.

[0082] Multiple partition walls 250, reflective layers 260 and cover layers 270 are provided, and a portion of the cover layer 270 includes spacers 270a.

[0083] A constant gap can be maintained between the display panel 1000 and the transparent color filter layer 300a, the first color conversion layer 300b and the second color conversion layer 300c by means of spacers 270a that protrude from part of the cover layer 270.

[0084] The reflective layer 260, the cover layer 270, and the spacer 270a can be formed using a single exposure mask, thus preventing an increase in manufacturing costs. This will be described in detail later.

[0085] Reference Figure 1 and Figure 2 The color conversion panel 2000 according to an embodiment will now be described in detail. Figure 2 This is a schematic cross-sectional view of the color conversion panel according to an embodiment.

[0086] Reference Figure 2 as well as Figure 1 According to an embodiment, the color conversion panel 2000 includes a second substrate 210 and a light blocking member 220 disposed on the second substrate 210.

[0087] The second substrate 210 may include a flexible material (such as plastic) so that it is flexible, bendable, foldable, or rollable.

[0088] The light-blocking member 220 prevents light passing through each of the transparent color filter layer 300a, the first color conversion layer 300b, and the second color conversion layer 300c from being mixed together and viewed, thereby increasing the contrast of the display device.

[0089] The first color filter 230a, the second color filter 230b, and the third color filter 230c are disposed on the second substrate 210 and the light blocking member 220.

[0090] A barrier layer 220a is disposed between the second color filter 230b and the third color filter 230c and the second substrate 210. The barrier layer 220a is not disposed in the area overlapping with the first color filter 230a.

[0091] A first insulating layer 240a is disposed on the first color filter 230a, the second color filter 230b, and the third color filter 230c. The first insulating layer 240a prevents the components of the first color filter 230a, the second color filter 230b, and the third color filter 230c from diffusing to the outside.

[0092] The partition wall 250 is disposed at a position overlapping with the light blocking member 220. The partition wall 250 can define an area where a transparent color filter layer 300a, a first color conversion layer 300b, and a second color conversion layer 300c are respectively disposed.

[0093] The reflective layer 260 is disposed on the portion of the outer surface of the partition wall 250 that does not contact the light-blocking member 220 and the color filters 230a, 230b and 230c. Figure 2 The side and top surfaces of the partition wall 250 in the middle.

[0094] The reflective layer 260 may include a light-reflecting metal (e.g., aluminum (Al) or silver (Ag)). The reflective layer 260 reflects light incident on the partition wall 250 and then emits light toward the second substrate 210, thereby increasing light efficiency. For example, compared to not providing the reflective layer 260, the light efficiency can be increased by at least about 20%.

[0095] A cover layer 270 and a spacer 270a are disposed on the reflective layer 260. The outer edges of the reflective layer 260 and the cover layer 270 may be vertically stacked. The reflective layer 260 and the cover layer 270 may be formed together, as will be described in detail later. Therefore, the reflective layer 260 and the cover layer 270 may have the same planar shape. Although not shown, the planar shape of each of the spacer 250, the reflective layer 260, and the cover layer 270 may be circular, elliptical, or polygonal (such as quadrilateral).

[0096] The cover layer 270 and the spacer 270a can be formed simultaneously in the same layer, may include a transparent organic material, and may be waterproof to repel liquids.

[0097] A waterproof cover layer 270 surrounds a reflective layer 260 disposed on a partition wall 250. Therefore, when the transparent color filter layer 300a, the first color conversion layer 300b, and the second color conversion layer 300c are formed by inkjet printing, the discharged liquid forming the transparent color filter layer 300a, the first color conversion layer 300b, and the second color conversion layer 300c can be dispersed toward the area separated by the partition wall 250, rather than being dispersed above the partition wall 250.

[0098] Multiple partition walls 250, reflective layers 260 and cover layers 270 are provided, and a portion of the cover layer 270 includes spacers 270a.

[0099] A constant gap can be maintained between the display panel 1000 and the transparent color filter layer 300a, the first color conversion layer 300b and the second color conversion layer 300c by means of spacers 270a that protrude from part of the cover layer 270.

[0100] A transparent color filter layer 300a, a first color conversion layer 300b, and a second color conversion layer 300c are disposed in the area defined by the partition wall 250.

[0101] The display panel 1000 that emits light to the color conversion panel 2000 can emit light of a first wavelength, and the transparent color filter layer 300a can transmit light of the first wavelength and may include a diffuser 301a.

[0102] The first color conversion layer 300b converts light of a first wavelength incident from the display panel 1000 into light of a second wavelength, and may include a scatterer 301a and a first quantum dot 301b. The second color conversion layer 300c converts light of a first wavelength incident from the display panel 1000 into light of a third wavelength, and may include a scatterer 301a and a second quantum dot 301c.

[0103] The scatterer 301a scatters light incident on the transparent color filter layer 300a, the first color conversion layer 300b, and the second color conversion layer 300c to increase light efficiency.

[0104] The first quantum dot 301b and the second quantum dot 301c can be selected from group II-VI compounds, group III-V compounds, group IV-VI compounds, group IV elements, group IV compounds and combinations thereof.

[0105] Group II-VI compounds can be selected from the group consisting of binary, ternary, and quaternary compounds. Binary compounds consist of CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, MgSe, MgS, and mixtures thereof. Ternary compounds consist of CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, and CdZnS. The compounds consist of CdZnSe, CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnSe, HgZnTe, MgZnSe, MgZnS and mixtures thereof. The quaternary compounds consist of HgZnTeS, CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe, HgZnSTe and mixtures thereof. III-V group compounds can be selected from the group consisting of binary, ternary and quaternary compounds. The binary compounds consist of GaN, GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InN, InP, InAs, InSb and mixtures thereof. The ternary compounds consist of GaNP, GaNAs, GaNSb, GaPAs, GaPSb, AlNP, AlNAs, AlNSb, AlPAs, AlPSb, InNP, InNAs, InNSb, InPAs, InPSb and mixtures thereof. The quaternary compounds consist of GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNP, GaInNAs, GaInNSb, GaInPAs, GaInPSb, GaAlNP, InAlNP, InAlNAs, InAlNSb, InAlPAs, InAlPSb and mixtures thereof. Group IV-VI compounds can be selected from the group consisting of binary, ternary, and quaternary compounds. Binary compounds consist of SnS, SnSe, SnTe, PbS, PbSe, PbTe, and mixtures thereof. Ternary compounds consist of SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSe, SnPbTe, and mixtures thereof. Quaternary compounds consist of SnPbSSe, SnPbSeTe, SnPbSTe, and mixtures thereof. Group IV elements can be selected from Si, Ge, and mixtures thereof. Group IV compounds can be binary compounds selected from SiC, SiGe, and mixtures thereof.

[0106] Binary, ternary, or quaternary compounds can exist in particles at a uniform concentration, or they can exist in the same particles after being partially divided into states with different concentration dispersions. They can have a core / shell structure in which one quantum dot surrounds another quantum dot. The interface between the core and shell can have a concentration gradient in which the concentration of the elements decreases near their center.

[0107] The shape of quantum dots is not specifically limited to the shapes commonly used in related technologies. For example, nanoparticles, nanotubes, nanowires, nanofibers, and planar nanoparticles with spherical, conical, multi-armed, or cubic shapes can be used.

[0108] The second insulating layer 240b is disposed on the transparent color filter layer 300a, the first color conversion layer 300b, and the second color conversion layer 300c. The second insulating layer 240b covers the transparent color filter layer 300a, the first color conversion layer 300b, and the second color conversion layer 300c for protection, so as to prevent the components of the filler layer 280 disposed when the color conversion panel 2000 is attached to the display panel 1000 from being introduced into the transparent color filter layer 300a, the first color conversion layer 300b, and the second color conversion layer 300c.

[0109] Light of a first wavelength emitted from the display panel 1000 is incident on the transparent color filter layer 300a, the first color conversion layer 300b, and the second color conversion layer 300c. Therefore, the light of the first wavelength is scattered and transmitted in the area where the transparent color filter layer 300a is disposed, and thus emitted toward the second substrate 210. The light of the first wavelength is converted into light of a second wavelength in the area where the first color conversion layer 300b is disposed, and thus emitted toward the second substrate 210. Furthermore, the light of the first wavelength is converted into light of a third wavelength in the area where the second color conversion layer 300c is disposed, and thus emitted toward the second substrate 210.

[0110] Color purity can be increased by color filters 230a, 230b and 230c disposed between the second substrate 210 and the transparent color filter layer 300a, the first color conversion layer 300b and the second color conversion layer 300c.

[0111] The first color filter 230a can transmit light of a first wavelength that passes through the transparent color filter layer 300a and can absorb light of other wavelengths, thereby increasing the purity of the first wavelength light emitted toward the second substrate 210. The second color filter 230b can transmit light of a second wavelength and can absorb light of other wavelengths, thereby increasing the purity of the second wavelength light emitted toward the second substrate 210. Similarly, the third color filter 230c can transmit light of a third wavelength and can absorb light of other wavelengths, thereby increasing the purity of the third wavelength light emitted toward the second substrate 210.

[0112] The blocking layer 220a can be disposed at the position where the first color conversion layer 300b and the second color conversion layer 300c are stacked with the second substrate 210. The blocking layer 220a can block (e.g., absorb) light of the first wavelength emitted toward the second substrate 210 in the first color conversion layer 300b and the second color conversion layer 300c without color conversion, thereby increasing the purity of the second wavelength light and the purity of the third wavelength light.

[0113] The blocking layer 220a can substantially block (e.g., absorb) light of a first wavelength and can transmit light of other wavelengths. For example, the blocking layer 220a can substantially block blue light of about 500 nm or less and can transmit light of other wavelengths (e.g., the visible light wavelength range greater than about 500 nm and less than 700 nm). For example, the blocking layer 220a can absorb about 80% or more, about 90% or more, or about 95% or more of blue light of about 500 nm or less and can have about 70% or more, about 80% or more, about 90% or more, or about 100% transmittance relative to the remaining visible light greater than about 500 nm and less than 700 nm.

[0114] The light blocking member 220, the partition wall 250, the reflective layer 260 and the cover layer 270 can be configured to be superimposed on the opaque area of ​​the display panel 1000, and the transparent color filter layer 300a, the first color conversion layer 300b and the second color conversion layer 300c can be configured to be superimposed on the light emitting area of ​​the display panel 1000.

[0115] As described above, the reflective layer 260 and the capping layer 270 can be formed simultaneously, thereby preventing an increase in manufacturing costs. The capping layer 270 and the spacer 270a can be formed from a single layer and can be formed using a single exposure mask during the manufacturing process, thus preventing an increase in manufacturing costs. This will be described in more detail later.

[0116] Reference Figures 3 to 10 as well as Figure 1 and Figure 2 A method for manufacturing a color conversion panel and a display device including the color conversion panel, according to an embodiment, is described. Figures 3 to 10 This is a schematic cross-sectional view of a method for manufacturing a color conversion panel according to an embodiment in a manufacturing sequence.

[0117] Reference Figure 3A blocking layer 220a and a light-blocking member 220 are sequentially formed on the second substrate 210. A first color filter 230a, a second color filter 230b, and a third color filter 230c are formed on the second substrate 210 and the light-blocking member 220. A first insulating layer 240a is stacked on the first color filter 230a, the second color filter 230b, and the third color filter 230c. Figure 3 As shown, the blocking layer 220a is disposed only below the second color filter 230b and the third color filter 230c, and not below the first color filter 230a.

[0118] Reference Figure 4 A partition wall 250 is formed on the first insulating layer 240a to overlap with the light-blocking member 220. The partition wall 250 may be formed of an opaque insulating layer, but this is not limiting, and may be photosensitive. The width W1 of the partition wall 250 may be about 4 μm, and the width W1 of the partition wall 250 may be narrower than the width of the light-blocking member 220.

[0119] Reference Figure 5 The reflective material layer 26 is stacked across the entire second substrate 210, including the partition wall 250. The reflective material layer 26 may be a reflective metal (e.g., aluminum or silver).

[0120] Reference Figure 6 A waterproof layer 27 is stacked on the reflective material layer 26 across the entire second substrate 210. The waterproof layer 27 may include a transparent organic material and may be waterproof. The waterproof layer 27 may also be photosensitive.

[0121] Reference Figure 7 The waterproof layer 27 is exposed and developed by using an exposure mask comprising a first region A, a second region B, and a third region C, each with different light transmittance.

[0122] The first region A is the region where the waterproof layer 27 will be removed, the second region B is the region where the waterproof layer 27 will be partially retained, and the third region C is the region where more of the waterproof layer 27 will be retained compared to the second region B, with most of the waterproof layer 27 in the third region C being retained.

[0123] For example, when the waterproof layer 27 has positive photosensitivity, the first region A can be a transmissive region through which the light from the exposure device is completely transmitted, the third region C of the exposure mask can be an opaque region that completely blocks the light from the exposure device, and the second region B of the exposure mask can be a semi-transmissive region that transmits only a portion of the light from the exposure device. Conversely, when the waterproof layer 27 has negative photosensitivity, the first region A of the exposure mask can be an opaque region that completely blocks the light from the exposure device, the third region C of the exposure mask can be a transmissive region through which the light from the exposure device is completely transmitted, and the second region B of the exposure mask can be a semi-transmissive region that transmits only a portion of the light from the exposure device.

[0124] As described, the waterproof layer 27 is exposed and developed using a halftone mask comprising a first region A, a second region B, and a third region C with different light transmittance levels, and as... Figure 8 As shown, a cover layer 270 having a first thickness T1 and a spacer 270a having a second thickness T2 that is thicker than the first thickness T1 are formed. The cover layer 270 and the spacer 270a can be formed on the same layer and can be formed simultaneously.

[0125] Spacer 270a protrudes from a portion of cover layer 270.

[0126] Due to the difference between the first thickness T1 of the cover layer 270 and the second thickness T2 of the spacer 270a, a height difference D1 is formed between the portion where the spacer 270a is provided and the portion where the spacer 270a is not provided. For example, the first thickness T1 of the cover layer 270 may be about 3 μm, and the second thickness T2 of the spacer 270a may be about 4 μm. The height difference D1 may be about 1 μm. A constant gap can be maintained between the display panel 1000 and the transparent color filter layer 300a, the first color conversion layer 300b, and the second color conversion layer 300c of the color conversion panel 2000.

[0127] like Figure 9 As shown, the reflective material layer 26 is etched by using the cover layer 270 and spacer 270a as an etching mask, thus, as Figure 10 As shown, a reflective layer 260 is formed having an edge that is vertically superimposed on the edge of the cover layer 270.

[0128] As described, the reflective material layer 26 and the waterproof layer 27 are stacked sequentially, and the waterproof layer 27 is patterned using a halftone exposure mask. Then, the reflective material layer 26 is etched using a cover layer 270 and a spacer 270a as an etching mask, allowing the reflective layer 260, cover layer 270, and spacer 270a to be formed simultaneously. Therefore, the light efficiency can be increased by using the reflective layer 260, while the precision of the inkjet manufacturing process can be improved by using the cover layer 270. Furthermore, a constant gap can be maintained between the display panel 1000 and the transparent color filter layer 300a, the first color conversion layer 300b, and the second color conversion layer 300c of the color conversion panel 2000 by using the spacer 270a, which prevents an increase in manufacturing costs.

[0129] Reference Figure 11 A transparent color filter layer 300a, a first color conversion layer 300b, and a second color conversion layer 300c are formed in the area defined by the partition wall 250 covered by the reflective layer 260 and the cover layer 270 using an inkjet method.

[0130] When the transparent color filter layer 300a, the first color conversion layer 300b, and the second color conversion layer 300c are formed by inkjet printing, the waterproof cover layer 270 surrounds the reflective layer 260 on the partition wall 250. Therefore, the liquid discharged from the formation of the transparent color filter layer 300a, the first color conversion layer 300b, and the second color conversion layer 300c can be dispersed toward the area defined by the partition wall 250, rather than being dispersed above the partition wall 250.

[0131] The display panel 1000 that emits light to the color conversion panel 2000 can emit light of a first wavelength, and the transparent color filter layer 300a transmits the light of the first wavelength and includes a diffuser 301a.

[0132] The first color conversion layer 300b converts light of a first wavelength incident from the display panel 1000 into light of a second wavelength, and includes a scatterer 301a and a first quantum dot 301b. The second color conversion layer 300c converts light of a first wavelength incident from the display panel 1000 into light of a third wavelength, and includes a scatterer 301a and a second quantum dot 301c.

[0133] like Figure 2 As shown, a second insulating layer 240b is stacked on the cover layer 270, spacer 270a, transparent color filter layer 300a, first color conversion layer 300b, and second color conversion layer 300c, and as... Figure 1As shown, the first substrate 110 of the display panel 1000 and the second substrate 210 of the color conversion panel 2000 are disposed facing each other, and then the filling layer 280 is filled between the display panel 1000 and the second insulating layer 240b, and then assembled to form a display device.

[0134] As described, according to the color conversion panel, the display device including the color conversion panel and the manufacturing method thereof, light passing through the transparent color filter layer 300a, the first color conversion layer 300b and the second color conversion layer 300c is reflected by the reflective layer 260 surrounding the outer surface of the partition wall 250, and then reflected to the outside again, thereby increasing the light efficiency.

[0135] The cover layer 270 covering the reflective layer 260 is waterproof, so when the transparent color filter layer 300a, the first color conversion layer 300b and the second color conversion layer 300c are formed by inkjet printing, the cover layer 270 helps the inkjet solution to be located in the center of the area defined by the partition wall 250, rather than above or around the partition wall 250.

[0136] By using an exposure mask to form the reflective layer 260, the cover layer 270, and the spacer 270a, the increase in manufacturing costs can be prevented.

[0137] Reference Figure 12 The following describes a display device according to another embodiment. Figure 12 This is a schematic cross-sectional view of a display device according to an embodiment.

[0138] Reference Figure 12 The display device according to the embodiment and Figure 1 The display device shown is similar.

[0139] However, with Figure 1 The display device shown in the figure is different. According to the embodiment, the display device may include a first display panel 100, a second display panel 200 stacked with the first display panel 100, and a liquid crystal layer 3 disposed between the first display panel 100 and the second display panel 200 and including liquid crystal molecules 31.

[0140] For example, the first display panel 100 may include thin-film transistors and pixel electrodes, and the second display panel 200 may include a common electrode. However, such a structure of the display panel 1000 is merely an example, and the display panel 1000 may include only a substrate.

[0141] The display panel 1000 may include a light-emitting device 500 disposed outside the first display panel 100 and thus supplying light. The light-emitting device 500 may emit light of a first wavelength. For example, the light-emitting device 500 may emit blue light.

[0142] Figure 12 The color conversion panel of the display device 2000 and according to Figure 1 The color conversion panel 2000 in the embodiment is the same.

[0143] As previously referred to Figure 2 The color conversion panel 2000 includes a light-blocking member 220, a first color filter 230a, a second color filter 230b, and a third color filter 230c, a first insulating layer 240a, a partition wall 250, a reflective layer 260, a cover layer 270, a spacer 270a, a transparent color filter layer 300a, a first color conversion layer 300b, a second color conversion layer 300c, and a second insulating layer 240b, disposed between the second insulating layer 240b and the display panel 1000. The color conversion panel 2000 may further include a light-blocking layer 220a disposed between the second substrate 210 and the second color filter 230b and the third color filter 230c.

[0144] Light passing through the transparent color filter layer 300a, the first color conversion layer 300b, and the second color conversion layer 300c is reflected by the reflective layer 260 surrounding the outer side of the partition wall 250, and then reflected to the outside, thereby increasing light efficiency. For example, compared to the case where no reflective layer 260 is provided, the light efficiency can be increased by at least about 20%.

[0145] The cover layer 270 covering the reflective layer 260 is waterproof, so when the transparent color filter layer 300a, the first color conversion layer 300b and the second color conversion layer 300c are formed by inkjet printing, the cover layer 270 helps the inkjet solution to be located in the center of the area defined by the partition wall 250, rather than above or around the partition wall 250.

[0146] A constant gap can be maintained between the display panel 1000 and the transparent color filter layer 300a, the first color conversion layer 300b, and the second color conversion layer 300c by the spacer 270a.

[0147] The reflective layer 260, the cover layer 270, and the spacer 270a can be formed using a single exposure mask, thus preventing an increase in manufacturing costs.

[0148] Reference Figures 1 to 11 The features of the described embodiments are applicable Figure 12 Examples of implementations.

[0149] Although the invention has been described in conjunction with what are considered practical embodiments, it should be understood that the invention is not limited to the disclosed embodiments. Rather, the invention is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. A color conversion panel, the color conversion panel comprising: Multiple partition walls are set on the base; Multiple reflective layers are disposed on the outer surfaces of the multiple partition walls; Multiple covering layers are disposed on the outer surface of the multiple reflective layers and are waterproof; A spacer, partially overlapping with and protruding from portions of the plurality of partition walls, wherein the spacer and the plurality of cover layers are formed of a single layer and are formed in the same layer; as well as Multiple color conversion layers are disposed on the multiple overlay layers and within the area defined by the multiple partition walls.

2. The color conversion panel as described in claim 1, wherein, The multiple color conversion layers include multiple quantum dots.

3. The color conversion panel of claim 2, further comprising a transparent color filter layer disposed on the plurality of cover layers and in the region defined by the plurality of partition walls, and transmitting light of a first wavelength.

4. The color conversion panel as described in claim 3, wherein, The plurality of color conversion layers include: A first color conversion layer converts light of the first wavelength into light of the second wavelength; and The second color conversion layer converts the light of the first wavelength into a third wavelength that is different from the light of the second wavelength.

5. The color conversion panel of claim 4, further comprising a barrier layer disposed between the substrate and the first color conversion layer and the second color conversion layer. in, The blocking layer absorbs the light of the first wavelength.

6. The color conversion panel of claim 5, further comprising a first color filter, a second color filter, and a third color filter disposed between the substrate and the transparent color filter layer, the first color conversion layer, and the second color conversion layer. in, The first color filter is stacked with the transparent color filter and transmits light of the first wavelength. The second color filter is stacked with the first color conversion layer and transmits light of the second wavelength. The third color filter is stacked with the second color conversion layer and transmits light of the third wavelength.

7. A display device, the display device comprising: Display panel, including a first substrate; The second substrate faces the first substrate; Multiple partition walls are disposed between the first substrate and the second substrate; Multiple reflective layers are disposed on the outer surfaces of the multiple partition walls; Multiple covering layers are disposed on the outer surface of the multiple reflective layers and are waterproof; A spacer, partially overlapping with and protruding from portions of the plurality of partition walls, wherein the spacer and the plurality of cover layers are formed of a single layer and are formed in the same layer; as well as Multiple color conversion layers are adjacent to the multiple overlay layers and disposed in the area defined by the multiple partition walls.

8. The display device as claimed in claim 7, wherein, The display panel includes organic light-emitting diodes, and The organic light-emitting diode emits light of a first wavelength.

9. The display device as claimed in claim 8, wherein, The multiple color conversion layers include multiple quantum dots.

10. The display device of claim 9, further comprising a transparent color filter layer disposed on the plurality of cover layers and in a region defined by the plurality of partition walls, the transparent color filter layer transmitting light of the first wavelength.

11. The display device as claimed in claim 10, wherein, The plurality of color conversion layers include: A first color conversion layer converts light of the first wavelength into light of the second wavelength; and The second color conversion layer converts the light of the first wavelength into a third wavelength that is different from the light of the second wavelength.

12. The display device of claim 11, further comprising a barrier layer disposed between the second substrate and the first color conversion layer and the second color conversion layer. in, The blocking layer absorbs the light of the first wavelength.

13. The display device of claim 12, further comprising a first color filter, a second color filter, and a third color filter disposed between the second substrate and the transparent color filter layer, the first color conversion layer, and the second color conversion layer. in, The first color filter is stacked with the transparent color filter and transmits light of the first wavelength. The second color filter is stacked with the first color conversion layer and transmits light of the second wavelength. The third color filter is stacked with the second color conversion layer and transmits light of the third wavelength.

Images