Display device and repair method of display device

Abstract

This invention discloses a display device and a method for repairing the display device. The display device of this invention includes: a first substrate including a lower electrode, an upper electrode, and a light-emitting layer disposed between the lower electrode and the upper electrode; and a second substrate bonded to the first substrate. The second substrate includes: a color filter overlapping the light-emitting region; and a light-shielding member overlapping the light-shielding region surrounding the light-emitting region. The light-shielding member includes an opening overlapping the lower electrode.

Description

Technical Field

[0001] This invention relates to a display device, and more specifically, to a display device and a method for repairing the display device. Background Technology

[0002] Organic light-emitting display devices, as self-emissive display devices, can generate color images without additional light sources such as backlights.

[0003] Recently, organic light-emitting display devices including color conversion layers are being researched to improve display quality. These color conversion layers can convert the wavelength of light supplied to the self-emissive elements. Therefore, light with a different color than the incident light can be emitted. For example, the color conversion layer may include wavelength-converting particles such as quantum dots.

[0004] In the manufacturing process of the organic light-emitting display device, if defective pixels are generated due to impurities flowing in, etc., a short circuit between the anode and cathode can be induced by irradiating with a laser, thereby converting the defective pixels into dark spots.

[0005] However, in organic light-emitting display devices that include a color conversion layer, laser light can be scattered by wavelength conversion particles or scatterers in the color conversion layer, which may damage surrounding normal pixels. Summary of the Invention

[0006] The purpose of this invention is to provide a display device that is easy to repair and has improved reliability.

[0007] Another object of the present invention is to provide a method for repairing the display device.

[0008] However, the present invention is not limited to the above objectives, and various extensions can be achieved without departing from the spirit and scope of the present invention.

[0009] To achieve the aforementioned objectives of the present invention, a display device according to an exemplary embodiment of the present invention includes: a first substrate including a lower electrode, an upper electrode, and a light-emitting layer disposed between the lower electrode and the upper electrode; and a second substrate coupled to the first substrate. The second substrate includes: a color filter overlapping the light-emitting region; and a light-shielding member overlapping the light-shielding region surrounding the light-emitting region. The light-shielding member includes an opening overlapping the lower electrode.

[0010] According to one embodiment, the color filter includes: a first color filter layer superimposed on a first light-emitting region emitting a first color light; and a second color filter layer superimposed on a second light-emitting region emitting a second color light different from the first color light.

[0011] According to one embodiment, the light-shielding component is formed of the same layer as the second color filter layer.

[0012] According to one embodiment, the first color filter layer also overlaps with at least a portion of the opening of the light-shielding component.

[0013] According to one embodiment, the second substrate further includes a color conversion layer that overlaps with the first light-emitting region and converts the wavelength of the incident light to emit the first color light.

[0014] According to one embodiment, the light-shielding component is a partition wall that houses the color conversion layer.

[0015] According to one embodiment, the second substrate further includes a compensation pattern disposed within the opening of the light-shielding member.

[0016] According to one embodiment, the openings have different shapes from each other.

[0017] A display device according to an exemplary embodiment of the present invention includes: a first substrate including pixel electrodes and a common electrode; and a second substrate coupled to the first substrate, and defining a light-emitting region, a light-shielding region surrounding the light-emitting region, and a marking region. The marking region is disposed within the light-shielding region, has different reflectivity to external light than the light-shielding region, and overlaps with a corresponding pixel electrode.

[0018] According to one embodiment, the second substrate includes: a color filter overlapping the light-emitting region; a color conversion layer overlapping at least a portion of the light-emitting region; and a partition wall housing the color conversion layer and overlapping the light-shielding region.

[0019] According to one embodiment, the color filter includes: a first color filter layer superimposed on a first light-emitting region emitting a first color light; and a second color filter layer superimposed on a second light-emitting region emitting a second color light different from the first color light and the light-blocking region.

[0020] According to one embodiment, the second color filter layer includes an opening that overlaps with the marked area.

[0021] According to one embodiment, the first color filter layer also overlaps with the marking area and the opening of the second color filter layer.

[0022] According to one embodiment, the first color filter layer also overlaps with the marked area.

[0023] According to one embodiment, the partition wall includes an opening that overlaps with the marked area.

[0024] According to one embodiment, the second substrate includes a compensation pattern disposed within the opening of the partition wall.

[0025] According to an exemplary embodiment of the present invention, a method for repairing a display device includes a first substrate comprising pixel electrodes and a common electrode, and a second substrate bonded to the first substrate. The second substrate defines a light-emitting region, a light-shielding region surrounding the light-emitting region, and a marking region disposed within the light-shielding region and overlapping with the corresponding pixel electrode. Defective pixels of the display device are detected. A laser is irradiated onto the marking region corresponding to the pixel electrode of the defective pixel.

[0026] According to one embodiment, the laser is a long-wavelength laser.

[0027] According to one embodiment, the marked area has different reflective properties to external light than the light-shielding area.

[0028] According to one embodiment, the second substrate includes a light-shielding member that overlaps with the light-shielding area, the light-shielding member including an opening that overlaps with the marking area.

[0029] According to an exemplary embodiment of the present invention, when repairing a display device, laser light is irradiated onto defective pixels through a light-shielding area that does not contain wavelength conversion particles or scatterers. Therefore, damage to normal pixels due to laser scattering can be prevented.

[0030] Furthermore, the display device includes a marking area for directing the laser beam to a precise location. Therefore, the reliability and efficiency of both the display device and the laser repair process can be improved. Attached Figure Description

[0031] Figure 1 This is a plan view illustrating a display device according to an embodiment of the present invention.

[0032] Figure 2 It is along Figure 1 The line I-I' shows a cross-sectional view of a display device according to an embodiment of the present invention.

[0033] Figure 3 This is a cross-sectional view illustrating a method for repairing a display device according to an embodiment of the present invention.

[0034] Figure 4 This is a plan view showing a unit pixel of a display device according to an embodiment of the present invention.

[0035] Figures 5 to 12 These are cross-sectional and plan views illustrating a method for manufacturing a color conversion substrate for a display device according to an embodiment of the present invention.

[0036] Figure 13 and Figure 14 This is a cross-sectional view showing the color conversion substrate of a display device according to an embodiment of the present invention.

[0037] Figures 15 to 18 This is a cross-sectional view illustrating a method for manufacturing a color conversion substrate for a display device according to an embodiment of the present invention.

[0038] Figure 19 This is a cross-sectional view showing a color conversion substrate of a display device according to an embodiment of the present invention. Detailed Implementation

[0039] Hereinafter, a display device and a method for repairing the display device according to exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same or similar reference numerals are used for the same or similar constituent elements.

[0040] Figure 1 This is a plan view illustrating a display device according to an embodiment of the present invention. Figure 1 It can display a unit pixel comprising multiple luminous regions that emit light of different colors from each other. Figure 2 It is along Figure 1 The line I-I' shows a cross-sectional view of a display device according to an embodiment of the present invention. Figure 3 This is a cross-sectional view illustrating a method for repairing a display device according to an embodiment of the present invention.

[0041] Reference Figure 1 and Figure 2 A display device according to an embodiment of the present invention includes a first substrate 100 and a second substrate 200. The first substrate 100 includes a pixel array. Each pixel of the pixel array may include: a light-emitting element that generates light according to a driving signal; and a driving element for driving the light-emitting element.

[0042] The second substrate 200 may include a color conversion layer that converts the wavelength of light generated from the light-emitting element. Furthermore, the second substrate 200 may include a color filter that allows light of a specific color to pass through.

[0043] Reference Figure 1 The display device may include: a display area for generating an image; and a surrounding area surrounding the display area. The display area may include: light-emitting areas LA1, LA2, and LA3 for emitting light; and a light-shielding area BA surrounding the light-emitting areas LA1, LA2, and LA3. Light generated from the display device can be emitted to the outside through the light-emitting areas.

[0044] The light-emitting areas LA1, LA2, and LA3 can emit light of different colors from each other. For example, the display device may include: a first light-emitting area LA1 emitting light of a first color; a second light-emitting area LA2 emitting light of a second color; and a third light-emitting area LA3 emitting light of a third color.

[0045] According to one embodiment, the first light-emitting region LA1 can emit red light, the second light-emitting region LA2 can emit blue light, and the third light-emitting region LA3 can emit green light. However, the embodiments of the present invention are not limited thereto. For example, the light-emitting regions can be combined to emit yellow light, cyan light, and magenta light.

[0046] Furthermore, the light-emitting areas can emit light of four or more colors. For example, the light-emitting areas can be combined to emit at least one of yellow, blue-green, and magenta light, in addition to red, green, and blue light. Furthermore, the light-emitting areas can also be combined to emit white light.

[0047] According to one embodiment, the light-emitting areas may each be substantially rectangular in shape. However, embodiments of the present invention are not limited thereto. For example, the light-emitting areas may have different shapes from each other. Furthermore, the light-emitting areas may have various shapes such as squares, rhombuses, triangles, and circles, and the edges or corners of each pixel may have curved or chamfered shapes.

[0048] According to one embodiment, the light-emitting regions LA1, LA2, and LA3 may have different sizes. For example, the first light-emitting region LA1, which emits red light, may have a larger area than the second light-emitting region LA2, which emits blue light, and the third light-emitting region LA3, which emits green light. Furthermore, the third light-emitting region LA3 may have a larger area than the second light-emitting region LA2.

[0049] However, the embodiments of the present invention are not limited thereto, and the light-emitting regions LA1, LA2, and LA3 may also have the same size as each other.

[0050] Reference Figure 2The first substrate 100 includes driving elements TR1, TR2, and TR3 disposed on a base substrate 110. The driving elements TR1, TR2, and TR3 can be electrically connected to corresponding light-emitting elements. The light-emitting elements can be organic light-emitting diodes (OLEDs). For example, the OLED can include: lower electrodes LE1, LE2, and LE3; an upper electrode UE; and an organic light-emitting layer OL disposed between the lower electrodes LE1, LE2, and LE3 and the upper electrode UE. The driving elements TR1, TR2, and TR3 can be electrically connected to the lower electrodes LE1, LE2, and LE3 of the corresponding OLEDs. The lower electrodes LE1, LE2, and LE3 can be pixel electrodes with patterns separated from each light-emitting element, and the upper electrode UE can be a common electrode.

[0051] For example, the base substrate 110 may include glass, quartz, sapphire, polymer materials, etc.

[0052] According to one embodiment, each driving element includes a thin-film transistor. The driving element may include multiple thin-film transistors.

[0053] For example, the channel layer of the thin-film transistor may include amorphous silicon, polycrystalline silicon, or a metal oxide semiconductor. The metal oxide semiconductor may include a binary compound (AB) containing indium (In), zinc (Zn), gallium (Ga), tin (Sn), titanium (Ti), aluminum (Al), hafnium (Hf), zirconium (Zr), magnesium (Mg), etc. x ), ternary compounds (AB) x C y ), quaternary compounds (AB) x C y D z For example, the metal oxide semiconductor may include zinc oxide (ZnO), etc. x Gallium oxide (GaO) x ), titanium oxide (TiO) x ), tin oxide (SnO x Indium oxide (InO) x Indium gallium oxide (IGO), indium zinc oxide (IZO), indium tin oxide (ITO), gallium zinc oxide (GZO), zinc magnesium oxide (ZMO), zinc tin oxide (ZTO), zinc zirconium oxide (ZnZr) x O y Indium gallium zinc oxide (IGZO), indium zinc tin oxide (IZTO), indium gallium hafnium oxide (IGHO), tin aluminum zinc oxide (TAZO), and indium gallium tin oxide (IGTO), etc.

[0054] The driving elements TR1, TR2, and TR3 may be covered by an insulating structure 120. The insulating structure may include a combination of inorganic and organic insulating layers.

[0055] The lower electrodes LE1, LE2, and LE3 can function as anodes. For example, the lower electrodes LE1, LE2, and LE3 can be formed as transmission electrodes or reflection electrodes depending on the type of light emission. When the lower electrodes LE1, LE2, and LE3 are formed as reflection electrodes, they may include gold (Au), silver (Ag), aluminum (Al), copper (Cu), nickel (Ni), platinum (Pt), magnesium (Mg), chromium (Cr), tungsten (W), molybdenum (Mo), titanium (Ti), etc., and may also include metal oxide layers such as indium tin oxide layer and indium zinc oxide layer.

[0056] The pixel defining layer (PDL) is disposed on the insulating structure 120 and has an opening that exposes at least a portion of the lower electrodes LE1, LE2, and LE3. For example, the pixel defining layer (PDL) may comprise an organic insulating material. At least a portion of the light-emitting layer (OL) may be disposed within the opening of the pixel defining layer (PDL). In one embodiment, the light-emitting layer (OL) may extend continuously across multiple pixels over the display area. In another embodiment, the light-emitting layer (OL) may be separated from the light-emitting layers of adjacent pixels.

[0057] The light-emitting layer OL can have a single-layer or multi-layer structure, including one or more functional layers such as a hole injection layer, a hole transport layer, an organic light-emitting layer, an electron transport layer, and an electron injection layer. The light-emitting layer OL can include low-molecular-weight organic compounds or high-molecular-weight organic compounds.

[0058] According to one embodiment, the light-emitting layer OL can generate blue light. However, embodiments of the present invention are not limited thereto. In another embodiment, the light-emitting layer OL can generate red or green light, or it can generate light with different colors depending on the pixel.

[0059] The upper electrode UE can be formed as a transmissive electrode or a reflective electrode depending on the light emission type of the display device including the thin-film transistor substrate. For example, the upper electrode UE can include metal, alloy, metal nitride, metal fluoride, conductive metal oxide, or a combination thereof. For example, the upper electrode UE can extend continuously across multiple pixels in the display area.

[0060] The first substrate 100 may further include an encapsulation layer 130 covering the array of light-emitting elements. The encapsulation layer 130 may extend continuously to cover the entire display area.

[0061] For example, the encapsulation layer 130 may include a stacked structure of organic and inorganic thin films. For example, such as Figure 2 As shown, the encapsulation layer 130 may include: a first inorganic film 132; an organic film 134 disposed on the first inorganic film 132; and a second inorganic film 136 disposed on the organic film 134. However, embodiments of the present invention are not limited thereto, and the encapsulation layer 130 may also have a structure comprising two or more organic films and three or more inorganic films.

[0062] For example, the organic film 134 may include a polymeric cured material such as polyacrylate. For example, the polymeric cured material may be formed through a cross-linking reaction of monomers. For example, the inorganic films 132 and 136 may include silicon oxides, silicon nitrides, silicon carbides, aluminum oxides, tantalum oxides, hafnium oxides, zirconium oxides, titanium oxides, etc.

[0063] The second substrate 200 may include a color conversion layer that converts the wavelength of light L1 generated from the light-emitting element of the first substrate 100 to emit light of a different color than the incident light L1. Furthermore, the second substrate 200 includes a color filter overlapping the color conversion layer.

[0064] The color filter can be disposed between the base substrate 210 of the second substrate 200 and the color conversion layer. The color filter can filter the light passing through it to allow light of a specific color to pass through.

[0065] According to one embodiment, the color filter may include a first color filter layer 222, a second color filter layer 224, and a third color filter layer 226. The color filter layers overlap with the corresponding light-emitting regions. Therefore, the colors of the light emitted from the light-emitting regions (L2R, L2B, L2G) can be determined using the color filter layers.

[0066] According to one embodiment, the first color filter layer 222 overlaps with the first light-emitting region LA1. For example, the first color filter layer 222 allows red light to pass through. The second color filter layer 224 overlaps with the second light-emitting region LA2. For example, the second color filter layer 224 allows blue light to pass through. The third color filter layer 226 overlaps with the third light-emitting region LA3. For example, the third color filter layer 226 allows green light to pass through.

[0067] The second color filter layer 224 may include: a transmissive portion overlapping the second light-emitting region LA2; and a light-shielding portion overlapping the light-shielding region BA. According to one embodiment, the light-shielding portion of the second color filter layer 224 may substantially be formed throughout the entire light-shielding region BA. The light-shielding portion functions as a light-shielding component by blocking light of a different color than the light transmitted by the second color filter layer 224.

[0068] According to one embodiment, the second color filter layer 224 may include openings corresponding to the first light-emitting region LA1 and the third light-emitting region LA3. The second color filter layer 224 may partially overlap with the first color filter layer 222 and the third color filter layer 226.

[0069] The second substrate 200 may include a first protective layer 240 covering the color filter layer. For example, the first protective layer 240 may include an inorganic material such as silicon oxide or silicon nitride.

[0070] The color conversion layer overlaps with the corresponding light-emitting region. For example, the second substrate 200 may include a first color conversion layer 232 that overlaps with the first light-emitting region LA1.

[0071] The first color conversion layer 232 may include wavelength conversion particles. For example, the first color conversion layer 232 may include a resin portion 232a, a scatterer 232b, and wavelength conversion particles 232c.

[0072] For example, the wavelength conversion particle 232c may include quantum dots. A quantum dot can be defined as a semiconductor material with nanocrystalline structure. The quantum dot has a specific band gap depending on its composition and size. Therefore, it can absorb incident light and emit light with a wavelength different from the incident light. For example, the quantum dot may have a diameter of less than 100 nm, preferably, it may have a diameter of 1 nm to 20 nm.

[0073] For example, the quantum dots may include group II-VI compounds, group III-V compounds, group IV-VI compounds, group IV elements, group IV compounds, and combinations thereof.

[0074] For example, group II-VI compounds can be selected from the group consisting of the following compounds: binary compounds selected from the group consisting of CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, MgSe, MgS and mixtures thereof; ternary compounds selected from the group consisting of CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, CdZnS, CdZnS e, CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnSe, HgZnTe, MgZnSe, MgZnS and mixtures thereof; and quaternary compounds selected from the group consisting of HgZnTeS, CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe, HgZnSTe and mixtures thereof.

[0075] For example, III-V compounds can be selected from the group consisting of: binary compounds selected from the group consisting of GaN, GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InN, InP, InAs, InSb and mixtures thereof; ternary compounds selected from the group consisting of GaNP, GaNAs, GaNSb, GaPAs, GaPSb, AlNP, AlNAs, AlNSb, AlPAs, AlPSb, InNP, InNAs, InNSb, InPAs, InPSb, GaAlNP and mixtures thereof; and quaternary compounds selected from the group consisting of GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNP, GaInNAs, GaInNSb, GaInPAs, GaInPSb, InAlNP, InAlNAs, InAlNSb, InAlPAs, InAlPSb and mixtures thereof.

[0076] For example, group IV-VI compounds can be selected from the group consisting of: binary compounds selected from the group consisting of SnS, SnSe, SnTe, PbS, PbSe, PbTe and mixtures thereof; ternary compounds selected from the group consisting of SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSe, SnPbTe and mixtures thereof; and quaternary compounds selected from the group consisting of SnPbSSe, SnPbSeTe, SnPbSTe and mixtures thereof.

[0077] For example, Group IV elements can be selected from the group consisting of Si, Ge, and mixtures thereof. Group IV compounds can be binary compounds selected from the group consisting of SiC, SiGe, and mixtures thereof.

[0078] For example, the quantum dot may have a core / shell structure comprising a core and a shell surrounding the core. For example, the core and the shell may comprise different materials from each other.

[0079] The wavelength conversion particles 232c can be dispersed within the resin portion 232a. For example, the resin portion 232a may include epoxy resin, acrylic resin, phenolic resin, melamine resin, Cardo resin, imide resin, etc.

[0080] The scatterer 232b can scatter the incident light without substantially changing the wavelength of the light incident on the first color conversion layer 232.

[0081] The scatterer 232b may include metal oxides or organic substances. For example, the metal oxides may include titanium oxide (TiO2), zirconium oxide (ZrO2), aluminum oxide (Al2O3), indium oxide (In2O3), zinc oxide (ZnO), tin oxide (SnO2), etc., and the organic substances may include acrylic resins or urethane resins, etc.

[0082] For example, the light-emitting element corresponding to the first light-emitting region LA1 can emit blue light L1 with a peak wavelength in the range of approximately 440 nm to approximately 480 nm. The first color conversion layer 232 can excite the incident blue light to emit red light. Blue light not excited by the first color conversion layer 232 is blocked at the first color filter layer 222. Therefore, the first light-emitting region LA1 can emit red light L2R. For example, the red light L2R can have a peak wavelength in the range of approximately 610 nm to 650 nm.

[0083] The second substrate 200 may further include a second color conversion layer 234 that overlaps with the third light-emitting region LA3. For example, the second color conversion layer 234 may include a resin portion 234a, a scatterer 234b, and wavelength conversion particles 234c.

[0084] For example, the light-emitting element corresponding to the third light-emitting region LA3 can emit blue light L1. The second color conversion layer 234 can excite the incident blue light to emit green light. Blue light not excited by the second color converter 234 is blocked in the third color filter layer 226. Therefore, the third light-emitting region LA3 can emit green light L2G. For example, the green light L2G can have a peak wavelength in the range of approximately 510 nm to 550 nm.

[0085] The second substrate 200 may further include a compensation layer 238 overlapping the second light-emitting region LA2. The compensation layer 238 does not contain a wavelength conversion material. Therefore, if the light-emitting element corresponding to the second light-emitting region LA2 emits blue light L1, the blue light can pass through the compensation layer 238 and enter the second color filter layer 224 without wavelength conversion. Therefore, the second light-emitting region LA2 can emit blue light L2B.

[0086] For example, the compensation layer 238 may include a resin portion 238a and a diffuser 238b. For example, the resin portion 238a may include the same resin as the resin portions 232a and 234a of the color conversion layers 232 and 234.

[0087] The second substrate 200 includes partition walls 250 surrounding the color conversion layers 232, 234 and the compensation layer 238. The partition walls 250 can form spaces capable of accommodating the ink composition during the formation of the color conversion layers 232, 234 and the compensation layer 238. Therefore, the partition walls 250 can have a grid shape or a matrix shape in a plan view.

[0088] For example, the partition wall 250 may include organic materials such as epoxy resin, phenolic resin, acrylic resin or silicone resin.

[0089] According to one embodiment, the partition wall 250 may include a light-shielding material to function as a black matrix. For example, at least a portion of the partition wall 250 may include a light-shielding material such as pigment, dye, or carbon black. For example, the partition wall 250 may substantially overlap with the entire light-shielding area BA. Therefore, the partition wall 250 can function as a light-shielding component defining the light-emitting areas LA1, LA2, and LA3.

[0090] The second substrate 200 may include a second protective layer 260, which covers the color conversion layers 232 and 234, the compensation layer 238, and the partition wall 250. For example, the second protective layer 260 may include inorganic materials such as silicon oxide or silicon nitride.

[0091] A filler component 300 may be disposed between the first substrate 100 and the second substrate 200. The filler component 300 may include organic materials such as silicone resins and epoxy resins. Furthermore, the filler component 300 may also include a suitable material for matching the refractive index.

[0092] The light-emitting elements of the display device emit light of a corresponding brightness based on the current supplied by the driving element. During the manufacturing process of the display device, defects may occur in the driving element or the light-emitting element due to process contamination, and defective pixels may be identified as dark spots or bright spots.

[0093] According to an embodiment of the present invention, after manufacturing the display device, defective pixels of the display device are detected. The defective pixels can be detected using currently known detection methods. To convert defective pixels that would otherwise appear as bright spots into non-emitting pixels, a laser is irradiated onto the light-emitting element corresponding to the defective pixel, causing a short circuit between the lower and upper electrodes of the light-emitting element. If the lower and upper electrodes of the light-emitting element are short-circuited, current does not flow through the organic light-emitting layer, thereby converting the defective pixel into a dark spot.

[0094] According to one embodiment, the laser can be irradiated through the second substrate 200. Since the first substrate 100 includes a complexly configured circuit section, interference caused by metal wiring or damage to the circuit section may occur when the laser is irradiated through the first substrate 100.

[0095] To induce a short circuit between the lower and upper electrodes, the laser can irradiate the overlapping area of ​​the lower and upper electrodes. For example, the lower and upper electrodes may overlap in the light-emitting area. However, if the light-emitting area includes wavelength-converting particles or scatterers, the laser light passing through the light-emitting area may be scattered, potentially damaging surrounding normal pixels.

[0096] According to an embodiment of the present invention, when repairing a display device, a laser is irradiated onto defective pixels through a light-shielding area that does not contain wavelength-converting particles or scatterers. This prevents normal pixels from being damaged due to laser scattering.

[0097] To effectively perform the repair process, it is preferable to accurately irradiate the area where the lower and upper electrodes overlap with laser light. However, in the shaded area, the overlapping area of ​​the lower and upper electrodes has a small size, making it difficult to accurately identify the corresponding area without additional markings.

[0098] According to one embodiment, the display device may include a marking region for identifying overlapping areas of the lower electrode and the upper electrode within a light-shielding region BA. The marking region does not overlap with the light-emitting region. Furthermore, the marking region overlaps with the lower and upper electrodes of the light-emitting element.

[0099] For example, the first marking region MK1 overlaps with the first lower electrode LE1, which overlaps with the first light-emitting region LA1. The second marking region MK2 overlaps with the second lower electrode LE2, which overlaps with the second light-emitting region LA2. The third marking region MK3 overlaps with the third lower electrode LE3, which overlaps with the third light-emitting region LA3. Since the upper electrode UE is a common electrode, the marking regions MK1, MK2, and MK3 can overlap with the upper electrode UE.

[0100] The marked areas MK1, MK2, and MK3 may have different reflective properties than the adjacent light-shielding area BA. According to one embodiment, the second color filter layer 224 disposed in the light-shielding area BA may have an opening that overlaps with the marked areas MK1, MK2, and MK3.

[0101] For example, the reflectivity of the light-shielding area BA to external light can be primarily determined by the second color filter layer 224 or by the second color filter layer 224 and the lower partition wall 250. In the marking areas MK1, MK2, and MK3, the second color filter layer 224 is removed; therefore, in the marking areas MK1, MK2, and MK3, the reflectivity to external light can be primarily determined by the partition wall 250.

[0102] Therefore, when illuminated by external light, the positions of the marked areas MK1, MK2, and MK3 can be accurately identified.

[0103] For example, such as Figure 3 As shown, when a pixel corresponding to the first light-emitting area LA1 malfunctions, a laser device 400 or the like irradiates the first marking area MK1 with a laser LS. Since the first marking area MK1 overlaps with the first lower electrode LE1 and the upper electrode UE, the first lower electrode LE1 and the upper electrode UE can be short-circuited by the laser LS.

[0104] The laser can be any known laser capable of inducing a short circuit in the electrode. For example, UV lasers, IR lasers, YAG lasers, Femto lasers, etc., can be used. According to one embodiment, a long-wavelength laser, such as an IR laser, can be used. For example, the wavelength of the long-wavelength laser can be approximately 800 nm or greater. The long-wavelength laser may be advantageous for long-distance energy transfer.

[0105] Reference Figure 1 Although the illustration shows a case where the marked areas MK1, MK2, and MK3 have a square shape, embodiments of the present invention are not limited thereto. For example, as... Figure 4As shown, the marked areas MK1, MK2, and MK3 can have polygonal shapes (such as rectangles, rhombuses, triangles, etc.), circular shapes, elliptical shapes, etc. Furthermore, the marked areas MK1, MK2, and MK3 can have different shapes or different sizes, which improves recognizability.

[0106] Reference Figure 1 The first marking region MK1 and the third marking region MK3 can overlap with the contact areas of the corresponding lower electrodes LE1 and LE3 and the driving elements TR1 and TR3. Furthermore, the second marking region MK2 can be arranged between the light-emitting region and the contact region. However, embodiments of the present invention are not limited thereto, such as... Figure 4 As shown, the marked area MK4 can also be separated from the contact area.

[0107] Figures 5 to 12 These are cross-sectional and plan views illustrating a method for manufacturing a color conversion substrate for a display device according to an embodiment of the present invention. Specifically, Figure 5 , Figure 7 as well as Figure 9 This is a plan view illustrating a method for manufacturing a color conversion substrate for a display device. Figure 6 , Figure 8 , Figure 10 , Figure 11 as well as Figure 12 It is along Figure 5 , Figure 7 as well as Figure 9 A cross-sectional view of line I-I'.

[0108] Reference Figure 5 and Figure 6 A second color filter layer 224 is formed on the base substrate 210. The second color filter layer 224 overlaps with the second light-emitting region LA2. Furthermore, the second color filter layer 224 may overlap with the light-shielding region BA surrounding the light-emitting regions LA1, LA2, and LA3. Therefore, the second color filter layer 224 may include openings corresponding to the first light-emitting region LA1 and the third light-emitting region LA3. Additionally, the second color filter layer 224 may include openings corresponding to the first marking region MK1, the second marking region MK2, and the third marking region MK3.

[0109] According to one embodiment, the second color filter layer 224 may be a blue color filter that allows blue light to pass through. For example, the second color filter layer 224 may be formed of a color filter composition comprising blue pigment and / or blue dye.

[0110] Reference Figure 7 and Figure 8A first color filter layer 222 and a third color filter layer 226 are formed on the base substrate 210.

[0111] The first color filter layer 222 overlaps with the first light-emitting region LA1.

[0112] According to one embodiment, the first color filter layer 222 may be a red color filter that allows red light to pass through. For example, the first color filter layer 222 may be formed of a color filter composition comprising red pigment and / or red dye.

[0113] The third color filter layer 226 overlaps with the third light-emitting region LA3.

[0114] According to one embodiment, the third color filter layer 226 may be a green color filter that allows green light to pass through. For example, the third color filter layer 226 may be formed of a color filter composition comprising green pigment and / or green dye.

[0115] In embodiments of the present invention, the formation order and arrangement of the color filter layers are not limited to the illustrated scenario. For example, the first color filter layer 222 or the third color filter layer 226 may be formed before the second color filter layer 224, thereby being arranged between the second color filter layer 224 and the base substrate 210.

[0116] Reference Figure 9 and Figure 10 A first protective layer 240 is formed covering the color filter layer. A partition wall 250 is formed on the first protective layer 240. The first protective layer 240 may be omitted if necessary.

[0117] The partition wall 250 can be formed to integrally overlap with the light-shielding area BA. The partition wall 250 has a receiving area that overlaps with the light-emitting area. According to one embodiment, the partition wall 250 can overlap with the marking areas MK1, MK2, and MK3.

[0118] For example, the partition wall 250 may include: a first storage area OP1, which overlaps with the first light-emitting area LA1; a second storage area OP2, which overlaps with the second light-emitting area LA2; and a third storage area OP3, which overlaps with the third light-emitting area LA3.

[0119] Reference Figure 11 and Figure 12Color conversion layers 232 and 234 and compensation layer 238 are formed within the storage areas OP1, OP2, and OP3 of the partition wall 250. For example, ink can be dropped into the storage areas OP1, OP2, and OP3 of the partition wall 250 and cured to form the color conversion layers 232 and 234 and the compensation layer 238.

[0120] For example, an inkjet printing device can be used to provide the ink. The inkjet printing device may include a plurality of nozzles 500.

[0121] The inkjet printing device can supply the composition to the storage areas OP1, OP2, and OP3 of the partition wall 250 through the nozzle 500. For example, the inkjet printing device can drip a first composition into the first storage area OP1, a second composition into the second storage area OP2, and a third composition into the third storage area OP3.

[0122] According to one embodiment, the first composition and the third composition may include wavelength conversion particles. For example, the first composition and the third composition may include wavelength conversion particles, scatterers, binder components, and solvents.

[0123] For example, the wavelength-converting particles may include quantum dots. According to one embodiment, the first composition may include quantum dots that emit red light, and the third composition may include quantum dots that emit green light. The quantum dots may include organic ligands bound to their surface.

[0124] The binder components may include polymeric compounds, polymerizable monomers, or combinations thereof. For example, the polymeric compound may include an aromatic ring structure within its main chain. The aromatic ring structure may include phenylene, biphenylene, fluorene, etc. The polymerizable monomer may have one or more carbon-carbon double bonds. For example, the polymerizable monomer may include (meth)acrylate compounds.

[0125] The solvent can be appropriately selected or combined from a variety of known substances, taking into account factors such as affinity with other components, dispersibility of quantum dots, viscosity, and boiling point.

[0126] The first and third compositions may further include, as needed, photoinitiators, polymeric stabilizers, homogenizers, coupling agents, or combinations thereof.

[0127] Except for excluding wavelength conversion particles, the second composition may include components substantially the same as those in the first or third composition. For example, the second composition may include a scatterer, a binder component, and a solvent, and may also include, as needed, a photoinitiator, a polymer stabilizer, a homogenizer, a coupling agent, or a combination thereof.

[0128] The inkjet printing device supplies ink droplets comprising corresponding compositions to the storage areas OP1, OP2, and OP3. Accordingly, the storage areas OP1, OP2, and OP3 can be filled.

[0129] The composition filling the storage areas OP1, OP2, and OP3 can be cured to form the first color conversion layer 232, the second color conversion layer 234, and the compensation layer 238. For example, the composition can be thermo-cured and photo-cured.

[0130] Next, a second protective layer 260 is formed covering the color conversion layers 232, 234 and the compensation layer 238.

[0131] The color conversion substrate is bonded to an array substrate including an array of light-emitting elements. The marking regions MK1, MK2, and MK3 of the color conversion substrate overlap with the lower electrodes of the light-emitting elements.

[0132] Figure 13 and Figure 14 This is a cross-sectional view showing the color conversion substrate of a display device according to an embodiment of the present invention.

[0133] Reference Figure 13 The color conversion substrate includes: light-emitting areas LA1, LA2, and LA3; a light-shielding area BA surrounding the light-emitting areas LA1, LA2, and LA3; and marking areas MK1, MK2, and MK3 arranged within the light-shielding area BA.

[0134] The first emitting region LA1 may overlap with the first color filter layer 222 that transmits the first color light. The second emitting region LA2 may overlap with the second color filter layer 224 that transmits the second color light. The third emitting region LA3 may overlap with the third color filter layer 226 that transmits the third color light. For example, the first color light may be red light, the second color light may be blue light, and the third color light may be green light.

[0135] The first marking area MK1 can be adjacent to the first luminous area LA1, the second marking area MK2 can be adjacent to the second luminous area LA2, and the third marking area MK3 can be adjacent to the third luminous area LA3.

[0136] The second color filter layer 224 also overlaps with the light-shielding area BA and has an opening that overlaps with the marking areas MK1, MK2, and MK3.

[0137] According to one embodiment, each marked region MK1, MK2, MK3 can be superimposed on a second color filter layer 224 that transmits light of a different color, which is integrally superimposed on the light-blocking region BA.

[0138] For example, each marked region MK1, MK2, and MK3 can be overlapped with a color filter layer that transmits light of a different color than that of adjacent luminescent regions. For example, the first color filter layer 222 can also overlap with the second marked region MK2 and the third marked region MK3. The third color filter layer 226 can also overlap with the first marked region MK1. However, embodiments of the present invention are not limited thereto, and each marked region MK1, MK2, and MK3 can also be overlapped with a color filter layer that transmits light of the same color as that of adjacent luminescent regions.

[0139] A partition wall 250 overlapping the light-shielding area BA is arranged on the color filter layer. Color conversion layers 232 and 234 and a compensation layer 238 are arranged within the storage area formed by the partition wall 250.

[0140] According to one embodiment, in a plan view, the light-shielding area BA overlaps with the second color filter layer 224, and the marking areas MK1, MK2, and MK3 overlap with either the first color filter layer 222 or the third color filter layer 226. Therefore, the marking areas MK1, MK2, and MK3 have different reflective properties to external light than the light-shielding area BA. Thus, the marking areas MK1, MK2, and MK3 can be easily identified.

[0141] Reference Figure 14 The second color filter layer 224 overlaps with the second light-emitting area LA2, the light-blocking area BA, and the marking areas MK1, MK2, and MK3. The first color filter layer 222 overlaps with the first light-emitting area LA2, the second marking area MK2, and the third marking area MK3. The third color filter layer 226 overlaps with the third light-emitting area LA3 and the first marking area MK1.

[0142] According to one embodiment, the first color filter layer 222 and the third color filter layer 226 are disposed between the second color filter layer 224 and the base substrate 210.

[0143] Therefore, in the plan view, the light-shielding area BA overlaps with the second color filter layer 224, and the marked areas MK1, MK2, and MK3 overlap with either the first color filter layer 222 or the third color filter layer 226. Therefore, the marked areas MK1, MK2, and MK3 have different reflective properties to external light than the light-shielding area BA. Therefore, the marked areas MK1, MK2, and MK3 can be easily identified.

[0144] Figures 15 to 18 This is a cross-sectional view illustrating a method for manufacturing a color conversion substrate for a display device according to an embodiment of the present invention. Figure 19 This is a cross-sectional view showing a color conversion substrate of a display device according to an embodiment of the present invention.

[0145] Reference Figure 15 A second color filter layer 224 is formed on the base substrate 210. The second color filter layer 224 overlaps with the second light-emitting region LA2. Furthermore, the second color filter layer 224 may overlap with the light-shielding region BA surrounding the light-emitting regions LA1, LA2, and LA3. Therefore, the second color filter layer 224 may include openings corresponding to the first light-emitting region LA1 and the third light-emitting region LA3.

[0146] According to one embodiment, the second color filter layer 224 may be a blue color filter that allows blue light to pass through.

[0147] Reference Figure 16 A first color filter layer 222 and a third color filter layer 226 are formed on the base substrate 210.

[0148] The first color filter layer 222 overlaps with the first light-emitting region LA1. According to one embodiment, the first color filter layer 222 may be a red color filter that allows red light to pass through.

[0149] The third color filter layer 226 overlaps with the third light-emitting region LA3. According to one embodiment, the third color filter layer 226 may be a green color filter that allows green light to pass through.

[0150] In embodiments of the present invention, the formation order and arrangement of the color filter layers are not limited to the illustrated scenario. For example, the first color filter layer 222 or the third color filter layer 226 may be formed before the second color filter layer 224, thereby being arranged between the second color filter layer 224 and the base substrate 210.

[0151] Reference Figure 17 A first protective layer 240 is formed covering the color filter layer. A partition wall 250 is formed on the first protective layer 240. The first protective layer 240 may be omitted if necessary.

[0152] The partition wall 250 can be formed to overlap integrally with the light-shielding area BA. The partition wall 250 has storage areas OP1, OP2, OP3 that overlap with the light-emitting areas LA1, LA2, LA3.

[0153] For example, the partition wall 250 may include: a first storage area OP1, which overlaps with the first light-emitting area LA1; a second storage area OP2, which overlaps with the second light-emitting area LA2; and a third storage area OP3, which overlaps with the third light-emitting area LA3.

[0154] According to one embodiment, the partition wall 250 further includes openings MA1, MA2, MA3 that overlap with the marking areas MK1, MK2, MK3.

[0155] Reference Figure 18 Color conversion layers 232 and 234 and compensation layer 238 are formed in the storage areas OP1, OP2 and OP3 of the partition wall 250.

[0156] Next, a second protective layer 260 is formed covering the color conversion layers 232, 234 and the compensation layer 238.

[0157] According to one embodiment, the light-shielding area BA overlaps with the second color filter layer 224 and the partition wall 250, and the marking areas MK1, MK2, and MK3 overlap with the second color filter layer 224. Therefore, the marking areas MK1, MK2, and MK3 can have different reflective characteristics to external light than the light-shielding area BA. Therefore, the marking areas MK1, MK2, and MK3 can be easily identified.

[0158] Furthermore, in the marked areas MK1, MK2, and MK3, by removing the partition wall 250, which includes light-blocking material, the energy transfer efficiency of the laser during the repair process can be improved.

[0159] Reference Figure 19 Compensation patterns CP1, CP2, and CP3 can be formed at the openings of the partition wall 250 that overlap with the marking areas MK1, MK2, and MK3. These compensation patterns CP1, CP2, and CP3 can compensate for step differences. For example, the compensation patterns CP1, CP2, and CP3 may include a transparent cured resin, and may also include colorants such as dyes and pigments as needed.

[0160] As described above, although the invention has been described with reference to exemplary embodiments, those skilled in the art will understand that various modifications and alterations can be made to the invention without departing from the spirit and scope of the invention.

[0161] Industrial availability

[0162] This invention can be applied to a variety of display devices. For example, it can be applied to display devices for vehicles, ships, and aircraft, portable communication devices, display devices for exhibition or information transmission, medical display devices, and many other display devices.

Claims

1. A display device, comprising: The first substrate includes a lower electrode, an upper electrode, and a light-emitting layer disposed between the lower electrode and the upper electrode; as well as The second substrate is bonded to the first substrate. The second substrate includes a color filter that overlaps with the light-emitting region. The color filter includes: A first color filter layer, superimposed on a first light-emitting region emitting a first color light; and The second color filter layer overlaps with the second light-emitting region that emits a second color light that is different from the first color light. The second color filter layer includes a light-shielding component that overlaps with the light-shielding area surrounding the light-emitting area. The light-shielding component has a marked area that overlaps with the lower electrode.

2. The display device as claimed in claim 1, characterized in that, The light-shielding component has an opening that overlaps with the marked area.

3. The display device as claimed in claim 2, characterized in that, The light-shielding component is formed of the same layer as the second color filter layer.

4. The display device as claimed in claim 3, characterized in that, The first color filter layer also overlaps with at least a portion of the opening of the light-shielding component.

5. The display device as claimed in claim 2, characterized in that, The second substrate further includes a color conversion layer that overlaps with the first light-emitting area and converts the wavelength of the incident light to emit the first color light.

6. The display device as claimed in claim 5, characterized in that, The second substrate also includes a partition wall for housing the color conversion layer.

7. The display device as claimed in claim 6, characterized in that, The second substrate also includes a compensation pattern disposed within the opening of the light-shielding member.

8. The display device as claimed in claim 2, characterized in that, The openings have different shapes from each other.

9. The display device as claimed in claim 1, characterized in that, The first color filter layer also overlaps with at least a portion of the marked area of ​​the light-shielding component.

10. A display device, comprising: The first substrate includes pixel electrodes and common electrodes; as well as A second substrate, bonded to the first substrate, is defined with a light-emitting area, a light-shielding area surrounding the light-emitting area, and a marking area. The marked area is arranged within the light-shielding area, has different reflective properties to external light than the light-shielding area, and overlaps with the corresponding pixel electrode. The second substrate includes: A color conversion layer that overlaps at least a portion of the luminescent region; and A partition wall houses the color conversion layer and overlaps with the light-blocking area. The partition wall includes an opening that overlaps with the marked area.

11. The display device as claimed in claim 10, characterized in that, The second substrate further includes: The color filter overlaps with the light-emitting area.

12. The display device as claimed in claim 11, characterized in that, The color filter includes: A first color filter layer, superimposed on a first light-emitting region emitting a first color light; and The second color filter layer overlaps the second emitting region that emits a second color light that is different from the first color light and the light-blocking region.

13. The display device as claimed in claim 12, characterized in that, At least a portion of the second color filter layer overlaps with the marked area.

14. The display device as claimed in claim 10, characterized in that, The second substrate includes a compensation pattern disposed within the opening of the partition wall.

15. A method for repairing a display device, as described in any one of claims 1 to 14, comprising the following steps: Detecting defective pixels in the display device; and A laser is irradiated onto the marking area corresponding to the pixel electrode of the defective pixel.

16. The method for repairing a display device as described in claim 15, characterized in that, The laser is a long-wavelength laser.

17. The method for repairing a display device as described in claim 15, characterized in that, The marked area has different reflective properties to external light than the shaded area.

Images