Display device

Abstract

According to one aspect of this disclosure, a display device includes: a substrate defining a plurality of sub-pixels; a plurality of light-emitting diodes disposed in the plurality of sub-pixels, sharing a common organic layer and a cathode, and each having a separate light-emitting layer and an anode; a conductive layer disposed between the plurality of sub-pixels; and a dam disposed between the plurality of light-emitting diodes below the cathode and exposing the anode and the conductive layer, wherein the plurality of sub-pixels includes a first sub-pixel and a second sub-pixel with an on-state voltage lower than that of the first sub-pixel, and the conductive layer is disposed between the first sub-pixel and the second sub-pixel, closer to the second sub-pixel.

Description

Technical Field

[0001] This disclosure relates to a display device, and more specifically, to a display device that can improve the color mixing of light emitted from a plurality of light-emitting diodes and minimize the degradation of the brightness of the light-emitting diodes. Background Technology

[0002] Currently, with the advent of the full-size information era, the field of display devices that express electrical information signals in a visual manner has developed rapidly, and continuous research is being conducted to improve the performance of various display devices, such as thinness, light weight, and low power consumption.

[0003] Among various display devices, organic light-emitting displays (OLEDs) are self-emissive, eliminating the need for a separate light source, unlike liquid crystal displays (LCDs). Therefore, OLEDs can be manufactured to be lightweight and thin. Furthermore, because OLEDs are driven by low voltage, they offer advantages not only in terms of power consumption but also in color reproduction, response speed, viewing angle, and contrast ratio (CR), making them a promising candidate for next-generation displays. Summary of the Invention

[0004] The objective of this disclosure is to provide a display device that minimizes leakage current when the display device is driven.

[0005] Another objective of this disclosure is to provide a display device that minimizes the reduction in brightness of subpixels.

[0006] The purpose of this disclosure is not limited to the above-mentioned purposes, and other purposes not mentioned above will be clearly understood by those skilled in the art from the following description.

[0007] According to an aspect of this disclosure, a display device includes: a substrate defining a plurality of sub-pixels; a plurality of light-emitting diodes disposed in the plurality of sub-pixels, sharing a common organic layer and a cathode, and each having a separate light-emitting layer and an anode; a conductive layer disposed between the plurality of sub-pixels; and a dam disposed below the cathode between the plurality of light-emitting diodes and exposing the anode and the conductive layer, wherein the plurality of sub-pixels includes a first sub-pixel and a second sub-pixel, the on-state voltage of the second sub-pixel is lower than the on-state voltage of the first sub-pixel, and the conductive layer is disposed closer to the second sub-pixel between the first sub-pixel and the second sub-pixel.

[0008] According to another aspect of this disclosure, the display device includes: a substrate; a plurality of sub-pixels disposed on the substrate and including a first sub-pixel and a second sub-pixel, wherein the on-state voltage of the second sub-pixel is lower than the on-state voltage of the first sub-pixel; a plurality of light-emitting diodes including an anode, a light-emitting layer, a common organic layer and a cathode, and disposed in each of the first sub-pixel and the second sub-pixel; and a conductive layer disposed between the first sub-pixel and the second sub-pixel, closer to the second sub-pixel, wherein the plurality of light-emitting diodes share the common organic layer and the cathode.

[0009] Further details of the exemplary embodiments are included in the detailed embodiments and the accompanying drawings.

[0010] According to this disclosure, a conductive layer is disposed between multiple sub-pixels to suppress leakage of current through a common organic layer.

[0011] According to this disclosure, even though current leaks from the sub-pixel, the light-emitting layer on the conductive layer also emits light to minimize the degradation of the sub-pixel's brightness.

[0012] The effects of this disclosure are not limited to those illustrated above, and this specification includes many more effects.

[0013] Appendix 1. A display device, the display device comprising:

[0014] A substrate, wherein a plurality of sub-pixels are defined in the substrate;

[0015] Multiple light-emitting diodes are disposed in multiple sub-pixels, sharing a common organic layer and a cathode, and each having a separate light-emitting layer and an anode;

[0016] A conductive layer disposed between the plurality of sub-pixels; and

[0017] A dam is disposed below the cathode located between the plurality of light-emitting diodes, and exposes the anode and the conductive layer.

[0018] The plurality of sub-pixels includes a first sub-pixel and a second sub-pixel, wherein the conduction voltage of the second sub-pixel is lower than the conduction voltage of the first sub-pixel, and the conductive layer is configured to be closer to the second sub-pixel than to the first sub-pixel.

[0019] Note 2. The display device according to Note 1 further includes:

[0020] A planarization layer is disposed between the substrate and the plurality of light-emitting diodes.

[0021] The anode and the conductive layer are disposed on the planarization layer.

[0022] Note 3. The display device according to Note 1, wherein the light-emitting layer disposed in the second sub-pixel is disposed on the conductive layer.

[0023] Note 4. The display device according to Note 3, wherein the width of the light-emitting layer disposed on the conductive layer is greater than the width of the conductive layer exposed by the embankment.

[0024] Note 5. The display device according to Note 1, wherein the first sub-pixel is a blue sub-pixel, and the second sub-pixel is a red sub-pixel or a green sub-pixel.

[0025] Appendix 6. In the display device according to Appendix 1, the plurality of sub-pixels further includes a third sub-pixel, the third sub-pixel having an on-state voltage lower than the first sub-pixel's on-state voltage and higher than the second sub-pixel's on-state voltage, and

[0026] The conductive layer includes:

[0027] A first conductive layer, wherein the first conductive layer is configured to be closer to the second sub-pixel between the first sub-pixel and the second sub-pixel; and

[0028] A second conductive layer is configured to be located closer to the third sub-pixel between the first sub-pixel and the third sub-pixel.

[0029] Note 7. The display device according to Note 6, wherein the conductive layer further comprises a third conductive layer, the third conductive layer being configured to be closer to the second sub-pixel between the second sub-pixel and the third sub-pixel.

[0030] Note 8. The display device according to Note 6, wherein the first sub-pixel is a blue sub-pixel, the second sub-pixel is a red sub-pixel, and the third sub-pixel is a green sub-pixel.

[0031] Note 9. The display device according to Note 1 further includes:

[0032] A groove pattern is disposed on the embankment and between the first sub-pixel and the conductive layer.

[0033] Note 10. The display device according to Note 9 further includes:

[0034] A conical pattern or an inverted conical pattern is disposed on the embankment located between the first sub-pixel and the trench pattern or between the trench pattern and the conductive layer.

[0035] Note 11. The display device according to Note 1, further comprising:

[0036] A conical pattern or an inverted conical pattern is disposed on the embankment located between the first sub-pixel and the conductive layer.

[0037] Note 12. The display device according to Note 1, wherein the conductive layer is electrically levitated.

[0038] Appendix 13. A display device, the display device comprising:

[0039] substrate;

[0040] Multiple sub-pixels are disposed on the substrate and include a first sub-pixel and a second sub-pixel, wherein the on-state voltage of the second sub-pixel is lower than the on-state voltage of the first sub-pixel;

[0041] A plurality of light-emitting diodes, each comprising an anode, a light-emitting layer, a common organic layer, and a cathode, and disposed in each of the first sub-pixel and the second sub-pixel; and

[0042] A conductive layer, wherein the conductive layer is positioned closer to the second sub-pixel between the first sub-pixel and the second sub-pixel.

[0043] The plurality of light-emitting diodes share the common organic layer and the cathode.

[0044] Note 14. The display device according to Note 13, wherein the anode and the conductive layer are disposed on the same layer and formed of the same material.

[0045] Note 15. The display device according to Note 13, wherein the light-emitting layer disposed in the second sub-pixel extends onto the conductive layer, such that the conductive layer, the light-emitting layer, the common organic layer, and the cathode form an auxiliary light-emitting diode.

[0046] Note 16. The display device according to Note 15, wherein the emitting area of ​​the auxiliary light-emitting diode is smaller than the emitting area of ​​each of the plurality of light-emitting diodes.

[0047] Note 17. The display device according to Note 15 further includes:

[0048] The third sub-pixel has a turn-on voltage lower than that of the first sub-pixel but higher than that of the second sub-pixel.

[0049] The auxiliary light-emitting diode includes:

[0050] A first auxiliary light-emitting diode emits light of the same color as the second sub-pixel between the first sub-pixel and the second sub-pixel; and

[0051] A second auxiliary light-emitting diode emits light of the same color as the third sub-pixel between the first sub-pixel and the third sub-pixel.

[0052] Note 18. The display device according to Note 17, wherein the auxiliary light-emitting diode further includes a third auxiliary light-emitting diode, the third auxiliary light-emitting diode emitting light having the same color as the second sub-pixel between the second sub-pixel and the third sub-pixel.

[0053] Note 19. The display device according to Note 13, wherein the first sub-pixel includes a blue light-emitting layer, and the second sub-pixel includes a red light-emitting layer or a green light-emitting layer.

[0054] Note 20. The display device according to Note 13, further comprising:

[0055] The third sub-pixel has a turn-on voltage lower than that of the first sub-pixel but higher than that of the second sub-pixel.

[0056] The conductive layer includes:

[0057] A first conductive layer, wherein the first conductive layer is configured to be closer to the second sub-pixel between the first sub-pixel and the second sub-pixel; and

[0058] A second conductive layer is configured to be located closer to the third sub-pixel between the first sub-pixel and the third sub-pixel.

[0059] Note 21. The display device according to Note 20, wherein the conductive layer further comprises a third conductive layer, the third conductive layer being configured to be closer to the second sub-pixel between the second sub-pixel and the third sub-pixel.

[0060] Note 22. The display device according to Note 20, wherein the first sub-pixel includes a blue light-emitting layer, the second sub-pixel includes a red light-emitting layer, and the third sub-pixel includes a green light-emitting layer.

[0061] Note 23. The display device according to Note 13 further includes:

[0062] A dam portion, configured to define the positions of the plurality of sub-pixels on the substrate and expose the conductive layer; and

[0063] A groove pattern is provided on the embankment located between the first sub-pixel and the second sub-pixel.

[0064] Note 24. The display device according to Note 23 further includes:

[0065] A conical pattern or an inverted conical pattern is disposed on the embankment located between the first sub-pixel and the groove pattern.

[0066] Note 25. The display device according to Note 13, further comprising:

[0067] A dam portion, configured to define the positions of the plurality of sub-pixels on the substrate and expose the conductive layer; and

[0068] A conical pattern or an inverted conical pattern is disposed on the embankment located between the first sub-pixel and the second sub-pixel.

[0069] Note 26. The display device according to Note 13, wherein the conductive layer is electrically levitated. Attached Figure Description

[0070] The above and other aspects, features and other advantages of this disclosure will become clearer from the following detailed description taken in conjunction with the accompanying drawings, wherein:

[0071] Figure 1 This is a schematic configuration diagram of a display device according to an exemplary embodiment of the present disclosure;

[0072] Figure 2 This is a circuit diagram of a sub-pixel of a display device according to an exemplary embodiment of the present disclosure;

[0073] Figure 3A This is an enlarged plan view of a display device according to an exemplary embodiment of the present disclosure;

[0074] Figure 3B It is along Figure 3A A cross-sectional view taken from line IIIb-IIIb';

[0075] Figure 4A This is a cross-sectional view of a display device according to a comparative embodiment;

[0076] Figure 4B This is an equivalent circuit diagram of a display device according to a comparative embodiment;

[0077] Figure 5 This is an equivalent circuit diagram of a display device according to an exemplary embodiment of the present disclosure;

[0078] Figure 6 It is a graph used to explain the effect of the display device according to the exemplary embodiments of the present disclosure;

[0079] Figure 7 This is an enlarged plan view of a display device according to another exemplary embodiment of the present disclosure;

[0080] Figure 8 This is a cross-sectional view of a display device according to yet another exemplary embodiment of the present disclosure;

[0081] Figure 9 This is a cross-sectional view of a display device according to yet another exemplary embodiment of the present disclosure; and

[0082] Figure 10 This is a cross-sectional view of a display device according to yet another exemplary embodiment of the present disclosure. Detailed Implementation

[0083] The advantages and features of this disclosure, as well as methods for achieving these advantages and features, will become clear from the exemplary embodiments described in detail below with reference to the accompanying drawings. However, this disclosure is not limited to the exemplary embodiments disclosed herein, but will be implemented in various forms. The exemplary embodiments are provided by way of example only to enable those skilled in the art to fully understand the disclosure and scope of this disclosure. Therefore, this disclosure will be limited only by the scope of the appended claims.

[0084] The shapes, dimensions, ratios, angles, quantities, etc., shown in the accompanying drawings to describe exemplary embodiments of this disclosure are merely examples, and this disclosure is not limited thereto. Throughout the specification, the same reference numerals generally denote the same elements. Furthermore, in the following description of this disclosure, detailed explanations of known related technologies may be omitted to avoid unnecessarily obscuring the subject matter of this disclosure. Terms such as “comprising,” “having,” and “consisting of” as used herein are generally intended to allow for the addition of other components, unless these terms are used in conjunction with the term “only.” Unless otherwise expressly stated, any reference to the singular may include the plural.

[0085] Even if not explicitly stated, components are interpreted as including common error ranges.

[0086] When using terms such as “above,” “on top,” “below,” and “under” to describe the positional relationship between two parts, one or more parts may be located between the two parts unless these terms are used in conjunction with the terms “immediately” or “directly.”

[0087] When an element or layer is placed "on" another element or layer, the other layer or element can be directly inserted on or between other elements.

[0088] Although the terms "first," "second," etc., are used to describe various components, these components are not limited by these terms. These terms are only used to distinguish one component from others. Therefore, in the technical concept of this disclosure, the first component mentioned below can be the second component.

[0089] Throughout the specification, the same reference numerals generally denote the same elements.

[0090] The dimensions and thicknesses of each component shown in the accompanying drawings are for illustrative purposes only, and this disclosure is not limited to the dimensions and thicknesses of the components shown.

[0091] The features of the various embodiments of this disclosure may be partially or wholly dependent on or combined with each other, and may be technically interlocked and operated in a variety of ways, and the embodiments may be performed independently or in association with each other.

[0092] In the following, a stretchable display device according to an exemplary embodiment of the present disclosure will be described in detail with reference to the accompanying drawings.

[0093] Figure 1 This is a schematic configuration diagram of a display device according to an exemplary embodiment of the present disclosure. Figure 1 For ease of description, only the display panel PN, the gating driver GD, the data driver DD, and the timing controller TC are shown among the various components of the display device 100.

[0094] Reference Figure 1 The display device 100 includes a display panel PN comprising multiple sub-pixels SP, a gating driver GD and a data driver DD that provide various signals to the display panel PN, and a timing controller TC that controls the gating driver GD and the data driver DD.

[0095] The gating driver GD provides multiple scan signals to multiple scan lines SL based on multiple gating control signals GCS provided from the timing controller TC. These multiple scan signals may include a first scan signal SCAN1 and a second scan signal SCAN2. Although in Figure 1 In this configuration, a gate driver GD is spaced apart from one side of the display panel PN. However, the gate driver GD can be configured as a gate within the panel (GIP), and the number and arrangement of the gate drivers GD are not limited to this.

[0096] The data driver DD uses a reference gamma voltage to convert the RGB image data input from the timing controller TC into a data signal based on multiple data control signals DCS provided by the timing controller TC. The data driver DD can then supply the converted data signal to multiple data lines DL.

[0097] The timing controller TC aligns with externally input image data (RGB) to provide the image data to the data driver DD. The timing controller TC can use an externally input synchronization signal SYNC (such as a dot clock signal, data enable signal, and horizontal / vertical synchronization signal) to generate a gating control signal GCS and a data control signal DCS. The timing controller TC then provides the generated gating control signal GCS and data control signal DCS to the gating driver GD and data driver DD, respectively, to control them.

[0098] The display panel PN is a structure that displays images to the user and includes a configuration of multiple sub-pixels SP. In the display panel PN, multiple scan lines SL and multiple data lines DL intersect each other, and the multiple sub-pixels SP are connected to the scan lines SL and data lines DL respectively. Although not shown in the figure, the multiple sub-pixels SP may be connected to high-potential power lines, low-potential power lines, initialization signal lines, transmit control signal lines, etc.

[0099] Multiple subpixels (SPs) are the smallest units constituting a screen, and each of the multiple subpixels (SPs) may include a light-emitting diode (LED) and pixel circuitry for driving the LED. The multiple LEDs can be defined in different ways depending on the type of the display panel (PN). For example, when the display panel (PN) is an organic light-emitting display panel, the LED can be an organic LED comprising an anode, an organic layer, and a cathode. In addition, quantum dot LEDs (QLEDs), including quantum dots (QDs), can also be used as LEDs. Although the following description assumes that the LEDs are organic light-emitting diodes, the type of LED is not limited to this.

[0100] A pixel circuit is a circuit used to control the driving of a light-emitting diode (LED). For example, a pixel circuit can be configured to include multiple transistors and capacitors, but is not limited to this.

[0101] In the following text, reference will be made to Figure 2 The pixel circuitry of the sub-pixel SP is described in more detail.

[0102] Figure 2 This is a circuit diagram of a sub-pixel of a display device according to an exemplary embodiment of the present disclosure.

[0103] Reference Figure 2The pixel circuit of multiple sub-pixels SP includes first to sixth transistors T1, T2, T3, T4, T5 and T6, and capacitor Cst.

[0104] The first transistor T1 is connected to the second scan line and controlled by the second scan signal SCAN2 provided through the second scan line. Furthermore, the first transistor T1 can be electrically connected between the data line providing the data signal Vdata and the capacitor Cst. When the on-level second scan signal SCAN2 is applied to the first transistor T1 through the second scan line, the first transistor T1 transmits the data signal Vdata from the data line to the capacitor Cst. The first transistor T1 can be referred to as a switching transistor, which controls the timing of applying the data signal Vdata to the capacitor Cst.

[0105] The second transistor T2 can be electrically connected between the high-potential power line supplied with the high-potential power signal EVDD and the fifth transistor T5. The gate electrode of the second transistor T2 can be electrically connected to the capacitor Cst. The second transistor T2 can be referred to as the driving transistor, which controls the current flowing through the light-emitting diode 120 according to the voltage applied to the gate electrode to control the brightness of the light-emitting diode 120.

[0106] The third transistor T3 can be controlled by a first scan signal SCAN1 provided through the first scan line. Depending on the type of the third transistor T3, the third transistor T3 can be electrically connected between the gate electrode and the drain electrode of the second transistor T2 or between the gate electrode and the source electrode.

[0107] Meanwhile, the second transistor T2, which acts as the driving transistor, needs to control the current flowing through the light-emitting diode 120 according to the data signal Vdata applied to the sub-pixel SP. However, the brightness deviation of the light-emitting diode 120 provided in each sub-pixel SP may be caused by the threshold voltage deviation of the second transistor T2 provided in each sub-pixel SP.

[0108] At this time, the third transistor T3 is configured to compensate for the threshold voltage of the second transistor T2, so that the third transistor T3 can be referred to as a compensation transistor. For example, when the first scan signal SCAN1, which turns on the third transistor T3, is applied, the voltage obtained by subtracting the threshold voltage of the second transistor T2 from the high-potential power supply signal EVDD is applied to the gate electrode of the second transistor T2. Furthermore, while the high-potential power supply signal EVDD, after subtracting the threshold voltage, is applied to the gate electrode of the second transistor T2, the data signal Vdata is applied to the capacitor Cst to compensate for the threshold voltage of the second transistor T2.

[0109] Meanwhile, it is shown that different scan signals SCAN1 and SCAN2 are applied to the third transistor T3 and the first transistor T1 from different scan lines. However, the third transistor T3 and the first transistor T1 can be connected to the same scan line and can be applied with the same scan signals SCAN1 and SCAN2, and they are not limited to this.

[0110] The fourth transistor T4 can be electrically connected to the capacitor Cst and the initialization signal line provided with the initialization signal Vini. Furthermore, the fourth transistor T4 can be controlled by the transmit control signal EM provided via the transmit control signal line. When the transmit control signal EM at a conduction level is applied via the transmit control signal line, the fourth transistor T4 can either initialize the voltage of the capacitor Cst or slowly discharge the data signal Vdata applied to the capacitor Cst to allow current to flow through the light-emitting diode 120 according to the data signal Vdata.

[0111] The fifth transistor T5 is electrically connected between the second transistor T2 and the light-emitting diode 120, and can be controlled by the transmit control signal EM provided via the transmit control signal line. When the transmit control signal EM is applied while the data signal Vdata is applied to the capacitor Cst and the high-potential power supply signal EVDD, which has been compensated for the threshold voltage, is applied to the gate electrode of the second transistor T2, the fifth transistor T5 is turned on. Therefore, current can flow through the light-emitting diode 120.

[0112] The sixth transistor T6 is electrically connected between the initialization signal line providing the initialization signal Vini and the anode of the light-emitting diode 120, and can be controlled by the first scan signal SCAN1 provided through the first scan line. When the first scan signal SCAN1, which has a conduction level, is applied through the first scan line, the sixth transistor T6 can initialize the anode of the light-emitting diode 120 or the node between the second transistor T2 and the fifth transistor T5 with the initialization signal Vini.

[0113] The capacitor Cst can be a storage capacitor Cst that stores the voltage applied to the gate electrode of the second transistor T2, which serves as a driving transistor. Here, the capacitor Cst is electrically connected between the gate electrode of the second transistor T2 and the anode of the light-emitting diode 120. Therefore, the capacitor Cst can store the difference between the voltage at the gate electrode of the second transistor T2 and the voltage applied to the anode of the light-emitting diode 120.

[0114] Although the pixel circuit of multiple sub-pixels SP is described in this specification, including first to sixth transistors T1, T2, T3, T4, T5 and T6 and capacitor Cst, the number of transistors and capacitors can vary depending on the design.

[0115] In the following text, reference will be made to Figure 3A and Figure 3B The sub-pixels SP of a display device 100 according to an exemplary embodiment of the present disclosure are described in more detail.

[0116] Figure 3A This is an enlarged plan view of a display device according to an exemplary embodiment of the present disclosure. Figure 3B It is along the map Figure 3A The cross-sectional view taken from line IIIb-IIIb'. (Refer to...) Figure 3A and Figure 3B A display device 100 according to an exemplary embodiment of the present disclosure includes a substrate 110, a buffer layer 111, a gate insulating layer 112, an interlayer insulating layer 113, a passivation layer 114, a planarization layer 115, a dam 116, a fifth transistor T5, a light-emitting diode 120, a conductive layer 140, and an auxiliary light-emitting diode 150. Figure 3B For ease of description, only the fifth transistor T5 and capacitor Cst of the multiple transistors T1, T2, T3, T4, T5 and T6 of the pixel circuit are shown.

[0117] Reference Figure 3A Multiple sub-pixels SP are independent light-emitting units, and light-emitting diodes 120 are disposed in each of the multiple sub-pixels SP. The multiple sub-pixels SP include a first sub-pixel SP1, a second sub-pixel SP2, and a third sub-pixel SP3 that emit light of different colors. For example, the first sub-pixel SP1 is a blue sub-pixel, the second sub-pixel SP2 is a red sub-pixel, and the third sub-pixel SP3 is a green sub-pixel.

[0118] The first sub-pixel SP1, the second sub-pixel SP2, and the third sub-pixel SP3 can have different on-state voltages. For example, the first sub-pixel SP1 may have the highest on-state voltage, the second sub-pixel SP2 may have the lowest on-state voltage, and the on-state voltage of the third sub-pixel SP3 may be between the on-state voltage of the first sub-pixel SP1 and the on-state voltage of the second sub-pixel SP2.

[0119] Multiple first subpixels SP1 can be arranged to form multiple columns. That is, multiple first subpixels SP1 can be arranged in the same column. Multiple second subpixels SP2 and multiple third subpixels SP3 can be arranged between multiple columns in which multiple first subpixels are arranged. For example, multiple first subpixels SP1 can be arranged in one column and second subpixels SP2 and third subpixels SP3 can be arranged together in adjacent columns. Furthermore, multiple second subpixels SP2 and multiple third subpixels SP3 can be alternately arranged in the same column. In this specification, multiple subpixels SP are described as including first subpixels SP1, second subpixels SP2, and third subpixels SP3. However, the arrangement, quantity, and color combination of multiple subpixels SP can vary in various ways according to the design and are not limited thereto.

[0120] Reference Figure 3B The substrate 110 is a support member for supporting other components of the display device 100 and may be made of an insulating material. For example, the substrate 110 may be formed of glass, resin, etc. In addition, the substrate 110 may be configured as a plastic including polymers or polyimide (PI) or may be formed of a flexible material.

[0121] A buffer layer 111 is disposed on the substrate 110. The buffer layer 111 can reduce the penetration of moisture or impurities through the substrate 110. The buffer layer 111 can be composed of a single layer or a double layer of silicon oxide (SiOx) or silicon nitride (SiNx), but is not limited thereto. However, the buffer layer 111 can be omitted depending on the type of substrate 110 or the type of transistor, but is not limited thereto.

[0122] The fifth transistor T5 is disposed on the buffer layer 111. The fifth transistor T5 includes an active layer ACT, a gate electrode GE, a source electrode SE, and a drain electrode DE.

[0123] The active layer ACT can be formed from semiconductor materials such as oxide semiconductors, amorphous silicon, or polycrystalline silicon, but is not limited to these. For example, when the active layer ACT is formed from oxide semiconductors, the active layer ACT consists of a channel region, a source region, and a drain region, and the source region and drain region can be conductive regions, but are not limited to these.

[0124] A gate insulating layer 112 is disposed on the active layer ACT. The gate insulating layer 112 is an insulating layer that insulates the active layer ACT from the gate electrode GE, and may be composed of a single layer or a double layer of silicon oxide SiOx or silicon nitride SiNx, but is not limited thereto.

[0125] The gate electrode GE is disposed on the gate insulating layer 112. The gate electrode GE may be made of a conductive material such as copper (Cu), aluminum (Al), molybdenum (Mo), nickel (Ni), titanium (Ti), chromium (Cr), or alloys thereof, but is not limited thereto.

[0126] An interlayer insulating layer 113 is disposed on the gate electrode GE. Contact holes are formed in the interlayer insulating layer 113, through which the source electrode SE and the drain electrode DE are connected to the active layer ACT. The interlayer insulating layer 113 may be composed of a single layer or a double layer of silicon oxide (SiOx) or silicon nitride (SiNx), but is not limited thereto.

[0127] The source electrode SE and drain electrode DE are disposed on the interlayer insulating layer 113. The source electrode SE and drain electrode DE, which are spaced apart from each other, can be electrically connected to the active layer ACT. The source electrode SE and drain electrode DE can be made of conductive materials, such as copper (Cu), aluminum (Al), molybdenum (Mo), nickel (Ni), titanium (Ti), chromium (Cr), or alloys thereof, but are not limited thereto.

[0128] A passivation layer 114 is disposed on the source electrode SE and the drain electrode DE. The passivation layer 114 is an insulating layer used to protect the components beneath it. For example, the passivation layer 114 may be composed of a single layer or a double layer of silicon oxide (SiOx) or silicon nitride (SiNx), but is not limited thereto. Furthermore, according to an exemplary embodiment, the passivation layer 114 may be omitted.

[0129] A planarization layer 115 is disposed on the passivation layer 114. The planarization layer 115 is disposed between the substrate 110 and the plurality of light-emitting diodes 120. The planarization layer 115 is an insulating layer that planarizes the upper portion 110 of the substrate. The planarization layer 115 may be formed of an organic material, and may be composed of, for example, a single layer or a double layer of polyimide or photosensitive acrylic, but is not limited thereto.

[0130] Multiple light-emitting diodes 120 are disposed in each of multiple sub-pixels SP on a planarization layer 115. Each light-emitting diode 120 includes an anode 121, an organic layer 122, and a cathode 123.

[0131] An anode 121 is disposed on the planarization layer 115. The anode 121 is electrically connected to transistors in the pixel circuit, such as the second transistor T2 and the fifth transistor T5, which are supplied with drive current. The anode 121 provides holes to the organic layer 122, so that the anode can be formed of a conductive material with a high work function. For example, the anode 121 can be formed of a transparent conductive material such as indium tin oxide (ITO) and indium zinc oxide (IZO), but is not limited thereto.

[0132] Meanwhile, the display device 100 can be implemented as either a top-emitting or bottom-emitting type. When the display device is a top-emitting type, a reflective layer formed of a metallic material (such as aluminum (Al) or silver (Ag)) with good reflectivity can be added below the anode 121. Therefore, light emitted from the organic layer 122 is reflected from the anode 121 and directed upwards, i.e., to the cathode 123. Conversely, when the display device 100 is a bottom-emitting type, the anode 121 can be formed solely of a transparent conductive material. Hereinafter, the display device 100 according to an exemplary embodiment of the present disclosure will be described under the assumption that it is a top-emitting type.

[0133] A conductive layer 140 is disposed between multiple sub-pixels SP. Specifically, the conductive layer 140 may be disposed on the planarization layer 115 between multiple sub-pixels SP. Therefore, the conductive layer 140 may be formed on the same layer as the anode 121 and may be formed of the same material as the anode 121. However, it is not limited to this; the conductive layer 140 may be formed on a different layer than the anode 121 and may be formed of a different material.

[0134] The conductive layer 140 is configured to be located near a sub-pixel with a low on-state voltage between a plurality of sub-pixels SP. For example, the conductive layer may be located near the second sub-pixel SP2 between the first sub-pixel SP1 and the second sub-pixel SP2, and near the third sub-pixel SP3 between the first sub-pixel SP1 and the third sub-pixel SP3. In this case, the conductive layer 140 may include a first conductive layer 141 located closer to the second sub-pixel SP2 between the first sub-pixel SP1 and the second sub-pixel SP2, and a second conductive layer 142 located closer to the third sub-pixel SP3 between the first sub-pixel SP1 and the third sub-pixel SP3. Figure 3A Although the first conductive layer 141 and the second conductive layer 142 are shown to be connected, this is not the only limitation, and the first conductive layer 141 and the second conductive layer 142 can be separated from each other.

[0135] The conductive layer 140 is electrically floating. For example, the conductive layer 140 is not electrically connected to a transistor or wiring, so that a separate voltage is not constantly applied to it.

[0136] A dam 116 is disposed on the anode 121 and the planarization layer 115. Therefore, the dam 116 is disposed below the cathode 123 between the plurality of light-emitting diodes 120. The dam 116 is an insulating layer disposed between the plurality of sub-pixels SP to divide the plurality of sub-pixels SP. The dam 116 includes openings exposing a portion of the anode 121 and the conductive layer 140. The dam 116 may be an organic insulating material configured to cover the end or edge of the anode 121. For example, the dam 116 may be formed of polyimide resin, acrylic resin, or benzocyclobutene (BCB) resin, but is not limited thereto.

[0137] An organic layer 122 is disposed on the anode 121 and the embankment 116. The organic layer 122 includes a light-emitting layer EML and common organic layers HIL, HTL, and ETL. The light-emitting layer EML is an organic layer 122 that emits light of a specific color, and different light-emitting layers EML can be disposed in the first sub-pixel SP1, the second sub-pixel SP2, and the third sub-pixel SP3, respectively. For example, the light-emitting layer EML disposed in the first sub-pixel SP1 is a blue light-emitting layer, the light-emitting layer EML disposed in the second sub-pixel SP2 is a red light-emitting layer, and the light-emitting layer EML disposed in the third sub-pixel SP3 is a green light-emitting layer.

[0138] The common organic layers HIL, HTL, and ETL are layers configured to improve the luminous efficiency of the emissive layer EML. The common organic layers HIL, HTL, and ETL are formed as a shared layer above multiple sub-pixels SP by multiple light-emitting diodes 120. That is, the common organic layers HIL, HTL, and ETL of multiple sub-pixels SP are formed integrally. The common organic layers HIL, HTL, and ETL may include, but are not limited to, a hole injection layer HIL, a hole transport layer HTL, and an electron transport layer ETL.

[0139] Furthermore, multiple emitting layers (EMLs) that emit the same color of light can be stacked on a single sub-pixel (SP). For example, two blue emitting layers are stacked on the first sub-pixel SP1, two red emitting layers are stacked on the second sub-pixel SP2, and two green emitting layers are stacked on the third sub-pixel SP3. In this case, a charge generation layer (CGL) is disposed between the multiple emitting layers (EMLs) to smoothly provide electrons or holes to each of the multiple emitting layers (EMLs). That is, the charge generation layer can be disposed between two blue emitting layers, two green emitting layers, and two red emitting layers.

[0140] A cathode 123 is disposed on the organic layer 122. The cathode 123 provides electrons to the organic layer 122, and thus the cathode can be formed of a conductive material with a low work function. The cathode 123 can be formed as a layer above multiple sub-pixels SP. That is, the cathodes 123 of multiple sub-pixels SP are connected to form an integral structure. For example, the cathode 123 can be formed of a transparent conductive material such as indium tin oxide (ITO) and indium zinc oxide (IZO) or a metal alloy such as MgAg or ytterbium (Yb) alloys, and may further include a metal doped layer, but is not limited thereto. Meanwhile, although not shown in the figure, the cathode 123 is electrically connected to a low-potential power line to be provided with a low-potential power signal EVSS.

[0141] Reference Figure 3BThe light-emitting layer EML of the light-emitting diode 120 of the second sub-pixel SP2 can be disposed on the conductive layer 140 adjacent to the second sub-pixel SP2. As described above, the conductive layer 140 is disposed adjacent to a sub-pixel SP with a relatively low on-state voltage between two adjacent sub-pixels SP, so the conductive layer 140 can be disposed adjacent to the second sub-pixel SP2 between the first sub-pixel SP1 and the second sub-pixel SP2. At this time, the light-emitting layer EML is disposed separately for each sub-pixel SP. In this case, depending on the high resolution of the display device 100, due to the allowance of the fine metal mask FMM used in the process of forming the light-emitting layer EML or the reduced spacing between the sub-pixels SP, a portion of the light-emitting layer EML is disposed on the embankment 116. Therefore, a portion of the light-emitting layer EML disposed in the second sub-pixel SP2 is disposed on the conductive layer 140 adjacent to the second sub-pixel SP2. Therefore, the organic layer 122 and the cathode 123 are disposed on the conductive layer 140, and the conductive layer 140, the organic layer 122, and the cathode 123 can be used as an auxiliary light-emitting diode 150.

[0142] At this time, the auxiliary light-emitting diode 150 may include a first auxiliary light-emitting diode 151 and a second auxiliary light-emitting diode 152. The first auxiliary light-emitting diode 151 emits light of the same color as the second sub-pixel SP2 between the first sub-pixel SP1 and the second sub-pixel SP2, and the second auxiliary light-emitting diode 152 emits light of the same color as the third sub-pixel SP3 between the first sub-pixel SP1 and the third sub-pixel SP3. Specifically, a portion of the light-emitting layer EML disposed in the second sub-pixel SP2 is disposed on the first conductive layer 141 between the first sub-pixel SP1 and the second sub-pixel SP2. Therefore, the first conductive layer 141, the organic layer 122', and the cathode 123 disposed on the first conductive layer 141 can form the first auxiliary light-emitting diode 151, and the first auxiliary light-emitting diode 151 can emit light of the same color as the second sub-pixel SP2. Furthermore, a portion of the light-emitting layer EML disposed in the third sub-pixel SP3 is disposed on the second conductive layer 142 between the first sub-pixel SP1 and the third sub-pixel SP3. Therefore, the second conductive layer 142, the organic layer 122', and the cathode 123 disposed on the second conductive layer 142 can form a second auxiliary light-emitting diode 152, and the second auxiliary light-emitting diode 152 can emit light with the same color as the third sub-pixel SP3.

[0143] At this time, the emitting area of ​​the auxiliary light-emitting diode 150 can be smaller than the emitting area of ​​the plurality of light-emitting diodes 120. That is, the area of ​​the first conductive layer 141 exposed by the dam 116 (which is the emitting area of ​​the first auxiliary light-emitting diode 151) and the area of ​​the second conductive layer 142 exposed by the dam 116 (which is the emitting area of ​​the second auxiliary light-emitting diode 152) can be smaller than the area of ​​the anode 121 exposed by the dam 116 in each of the plurality of sub-pixels SP.

[0144] Reference Figure 3B The width W2 of the light-emitting layer EML disposed on the first conductive layer 141 can be greater than the width W1 of the first conductive layer 141 exposed by the dam portion 116. That is, due to the allowance of the fine metal mask (FMM), the light-emitting layer EML of the organic layer 122' disposed on the first conductive layer 141 is disposed on the dam portion 116. Therefore, the width W2 of the light-emitting layer EML disposed on the first conductive layer 141 can be greater than the width W1 of the first conductive layer 141 exposed by the dam portion 116. Furthermore, the width of the light-emitting layer EML disposed on the second conductive layer 142 can be greater than the width of the second conductive layer 142 exposed by the dam portion 116.

[0145] In the following text, reference will be made to Figures 4A to 6 The effects of the display device 100 according to an exemplary embodiment of the present disclosure will be described in more detail.

[0146] Figure 4A This is a cross-sectional view of a display device according to a comparative embodiment. Figure 4B This is a circuit diagram of a display device according to a comparative embodiment. Figure 5 This is a circuit diagram of a display device according to an exemplary embodiment of the present disclosure. Figure 6 These are simulation results of the current flowing through a plurality of light-emitting diodes in a display device according to an exemplary embodiment of the present disclosure. (And...) Figures 1 to 3B Compared to display device 100, Figure 4A and Figure 4B The only difference between the display device 10 of the comparative implementation is that it does not include the conductive layer 140, but the other configurations are basically the same, so redundant descriptions will be omitted. Figure 4B and Figure 5An equivalent circuit diagram is shown, illustrating the use of a fifth transistor T5 and a light-emitting diode 120 comprising adjacent first sub-pixels SP1 and SP2, and an equivalent resistance R for a leakage current path formed by common organic layers HIL, HTL, and ETL between the first sub-pixels SP1 and SP2, a first equivalent resistance R1 for a leakage current path formed by common organic layers HIL, HTL, and ETL between the first sub-pixels SP1 and the first conductive layer 141, and a second equivalent resistance R2 for a leakage current path formed by common organic layers HIL, HTL, and ETL between the second sub-pixels SP2 and the first conductive layer 141. Figure 4B and Figure 5 The image shows that the fifth transistor T5 of the first sub-pixel SP1 is turned on, while the fifth transistor T5 of the second sub-pixel SP2 is turned off. Figure 6 The diagram shows the current in pA flowing through the LED 120 of the first sub-pixel SP1, the LED 120 of the second sub-pixel SP2, and the first auxiliary LED 151 when the first sub-pixel SP1 is turned on only, as the resistance ratio of the first equivalent resistance R1 changes with the resistance ratio of the second equivalent resistance R2.

[0147] Reference Figure 4A and Figure 4B In the display device 10 according to the comparative embodiment, the common organic layers HIL, HTL and ETL of the plurality of light-emitting diodes 120 are formed as a single layer on all the plurality of sub-pixels SP.

[0148] At this time, since the light-emitting diodes 120 of multiple sub-pixels SP are formed to share a common organic layer HIL, HTL, and ETL, a phenomenon may occur where, when the light-emitting diode 120 of the first sub-pixel SP1 emits light, current flows to the light-emitting diode 120 of the adjacent second sub-pixel SP2, i.e., leakage current. This leakage current causes the light-emitting diodes 120 of the unintended sub-pixel SP to emit light, resulting in color mixing among the multiple sub-pixels SP and increased power consumption. Furthermore, due to the leakage current, color anomalies and spots become visibly identifiable, potentially degrading display quality. For example, when only the first sub-pixel SP1 emits light among the multiple sub-pixels SP, a portion of the current supplied to drive the light-emitting diode 120 of the first sub-pixel SP1 may leak through the common organic layer HIL, HTL, and ETL to its adjacent second sub-pixel SP2.

[0149] Furthermore, each of the multiple sub-pixels SP has a different on-state voltage for its individually configured emissive layer EML. For example, the on-state voltage for driving the first sub-pixel SP1, on which a blue emissive layer is disposed, can be the highest, and the on-state voltage for driving the second sub-pixel SP2, on which a red emissive layer is disposed, can be the lowest. In the second sub-pixel SP2, where the on-state voltage is lower than that of the first sub-pixel SP1 with the highest on-state voltage, the current flow barrier is low. Therefore, the current leaking through the common organic layers HIL, HTL, and ETL can easily flow from the first sub-pixel SP1 with the high on-state voltage to the second sub-pixel SP2 with the low on-state voltage. As a result, when the first sub-pixel SP1 is driven, the second sub-pixel SP2 with the low on-state voltage can emit light together.

[0150] Specifically, during low grayscale driving, the light emitted from the sub-pixel SP being driven has lower brightness, making it easier to identify light emitted from adjacent sub-pixels SP. In other words, during low grayscale driving, color anomalies and spot defects caused by leakage current are more easily detected, potentially leading to a significant deterioration in display quality. Furthermore, when displaying low grayscale white light, the second sub-pixel SP2, which has the lowest on-state voltage, emits light first through the common organic layers HIL, HTL, and ETL, potentially resulting in a reddish-white appearance instead of pure white.

[0151] At the same time, refer to Figures 1 to 3B and Figure 5 In the display device 100 according to an exemplary embodiment of the present disclosure, a floating conductive layer 140 is disposed between a plurality of sub-pixels SP, and the conductive layer 140, organic layer 122, and cathode 123 can serve as auxiliary light-emitting diodes 150. Therefore, when the first sub-pixel SP1 is driven, the current leaking from the first sub-pixel SP1 can flow through the first conductive layer 141 disposed between the first sub-pixel SP1 and the second sub-pixel SP2 and the second conductive layer 142 disposed between the first sub-pixel SP1 and the third sub-pixel SP3 to the cathode 123 disposed on the first conductive layer 141 and the second conductive layer 142. By doing so, when the first sub-pixel SP1 is driven, the leakage current flowing from the first sub-pixel SP1 to the second sub-pixel SP2 and the third sub-pixel SP3 can be reduced. Therefore, in the display device 100 according to an exemplary embodiment of the present disclosure, the conductive layer 140 is disposed between the first sub-pixel SP1 and the second sub-pixel SP2 and the third sub-pixel SP3 to reduce leakage current flowing from the first sub-pixel SP1, which has the highest on-state voltage, to the second sub-pixel SP2 and the third sub-pixel SP3. Furthermore, it can minimize the degradation of display quality due to color mixing, speckles, or abnormal colors.

[0152] At the same time, refer to Figure 6The current flowing through the LED 120 of the first sub-pixel SP1, the LED 120 of the second sub-pixel SP2, and the first auxiliary LED 151 can change with the resistance ratio of the first equivalent resistance R1 to the second equivalent resistance R2. For example, when the second equivalent resistance is increased compared to the case where the first equivalent resistance R1 and the second equivalent resistance R2 are equal (i.e., the first conductive layer 141 is disposed between the first sub-pixel SP1 and the second sub-pixel SP2), the current flowing to the LED 120 of the first sub-pixel SP1 decreases. Therefore, when the second equivalent resistance R2 is higher than the first equivalent resistance R1, that is, when the first conductive layer 141 is disposed closer to the first sub-pixel SP1, the luminous efficiency of the first sub-pixel SP1 decreases, which may reduce brightness.

[0153] Therefore, in the display device 100 according to an exemplary embodiment of the present disclosure, the first conductive layer 141 may be configured to be adjacent to a sub-pixel SP having a relatively low on-state voltage. That is, the first conductive layer 141 is configured to be closer to the second sub-pixel SP2 having a relatively low on-state voltage between the first sub-pixel SP1 and the second sub-pixel SP2, in order to minimize the brightness reduction of the first sub-pixel SP1.

[0154] Here, when the first conductive layer 141 is configured to be adjacent to the second sub-pixel SP2, causing the second sub-pixel SP2 to be turned on and the first sub-pixel SP1 to be turned off, the brightness of the second sub-pixel SP2 may decrease. However, as described above, the first conductive layer 141 is configured to be adjacent to the second sub-pixel SP2, so that the light-emitting layer EML and the cathode 123 of the second sub-pixel SP2 can be disposed on the first conductive layer 141. Therefore, the first auxiliary light-emitting diode 151 can also emit the same light as the light-emitting diode 120 disposed in the second sub-pixel SP2, such as red light. Therefore, in the display device 100 according to an exemplary embodiment of the present disclosure, the first auxiliary light-emitting diode 151 is implemented using the first conductive layer 141 configured to be adjacent to the second sub-pixel SP2 to solve the problem of brightness degradation that occurs when the second sub-pixel SP2 is driven.

[0155] Meanwhile, as described above, in order to improve the brightness degradation of the first sub-pixel SP1 caused by the first conductive layer 141 being positioned adjacent to the first sub-pixel SP1, it is possible to allow the first auxiliary light-emitting diode 151 to emit light with the same color as the first sub-pixel SP1 by setting the light-emitting layer EML of the first sub-pixel SP1 on the first conductive layer 141 positioned adjacent to the first sub-pixel SP1. However, when the first conductive layer 141 is positioned adjacent to the first sub-pixel SP1 to allow the first auxiliary light-emitting diode 151 to emit the same blue light as the first sub-pixel SP1, the first auxiliary light-emitting diode 151 can function as a light-emitting diode that emits essentially blue light. However, in this case, the first sub-pixel SP1 can be defined as a region including the first auxiliary light-emitting diode 151, such that the distance between the second sub-pixel SP2, which has a relatively low on-state voltage, and the first sub-pixel SP1, which has a relatively high on-state voltage, may be closer. Therefore, a larger leakage current from the light-emitting diode 120 of the first sub-pixel SP1 and the first auxiliary light-emitting diode 151 can flow to the second sub-pixel SP2. As a result, in the display device 100 according to an exemplary embodiment of the present disclosure, the conductive layer 140 is configured to be adjacent to the sub-pixel SP having a relatively low on-state voltage to reduce leakage current flowing to the second sub-pixel SP2 and to minimize the brightness reduction of the first sub-pixel SP1.

[0156] Simultaneously, the second auxiliary light-emitting diode 152 can also perform the same function as the first auxiliary light-emitting diode 151. That is, the second auxiliary light-emitting diode 152 can be configured to be closer to the third sub-pixel SP3, which has a relatively low on-state voltage, and the first sub-pixel SP1, which has a relatively high on-state voltage. Therefore, the second auxiliary light-emitting diode 152 can reduce the leakage current flowing to the third sub-pixel SP3 and minimize the brightness reduction of the first sub-pixel SP1.

[0157] Figure 7 This is an enlarged plan view of a display device according to another exemplary embodiment of the present disclosure. Figure 7 Display device 700 and Figures 1 to 3B The only difference in the display device is that a conductive layer 740 and an auxiliary light-emitting diode 750 are also provided between the second sub-pixel SP2 and the third sub-pixel SP3, but the other configurations are basically the same. Therefore, redundant descriptions will be omitted.

[0158] Multiple sub-pixels SP include a third sub-pixel SP3, whose on-state voltage is lower than that of the first sub-pixel SP1 and higher than that of the second sub-pixel SP2. For example, the first sub-pixel SP1 is a blue sub-pixel, the second sub-pixel SP2 is a red sub-pixel, and the third sub-pixel SP3 is a green sub-pixel. Therefore, the first sub-pixel SP1 includes a blue emitting layer, the second sub-pixel SP2 has a red emitting layer, and the third sub-pixel SP3 has a green emitting layer.

[0159] Reference Figure 7 The conductive layer 740 is also disposed between the third sub-pixel SP3 and the second sub-pixel SP2. The conductive layer 740 is configured to be closer to the second sub-pixel SP2 between the third sub-pixel SP3 and the second sub-pixel SP2. Specifically, the conductive layer 740 may include a first conductive layer 741, a second conductive layer 742, and a third conductive layer 743. The first conductive layer 741 is configured to be closer to the second sub-pixel SP2 between the first sub-pixel SP1 and the second sub-pixel SP2. The second conductive layer 742 is configured to be closer to the third sub-pixel SP3 between the first sub-pixel SP1 and the third sub-pixel SP3. The third conductive layer 743 is configured to be closer to the second sub-pixel SP2 between the second sub-pixel SP2 and the third sub-pixel SP3. Figure 7 Although the diagram shows the first conductive layer 741, the second conductive layer 742, and the third conductive layer 743 connected, it is not limited to this, and the first conductive layer 741, the second conductive layer 742, and the third conductive layer 743 can be separated.

[0160] The auxiliary light-emitting diode 750 may include a first auxiliary light-emitting diode 751, a second auxiliary light-emitting diode 752, and a third auxiliary light-emitting diode 753. The first auxiliary light-emitting diode 751 emits light having the same color as the second sub-pixel SP2 between the first sub-pixel SP1 and the second sub-pixel SP2, and the second auxiliary light-emitting diode 752 emits light having the same color as the third sub-pixel SP3 between the first sub-pixel SP1 and the third sub-pixel SP3. Furthermore, the third auxiliary light-emitting diode 753 emits light having the same color as the second sub-pixel SP2 between the second sub-pixel SP2 and the third sub-pixel SP3. Specifically, a portion of the light-emitting layer EML in the second sub-pixel SP2 is disposed on the first conductive layer 741 between the first sub-pixel SP1 and the second sub-pixel SP2. Therefore, the first conductive layer 141, the organic layer 122', and the cathode 123 disposed on the first conductive layer 141 can form the first auxiliary light-emitting diode 751, and the first auxiliary light-emitting diode 751 can emit light having the same color as the second sub-pixel SP2. Furthermore, the portion of the light-emitting layer EML disposed in the third sub-pixel SP3 is disposed on the second conductive layer 742 between the first sub-pixel SP1 and the third sub-pixel SP3. Therefore, the second conductive layer 742, the organic layer 122, and the cathode 123 disposed on the second conductive layer 742 can form a second auxiliary light-emitting diode 752, and the second auxiliary light-emitting diode 752 can emit light with the same color as the third sub-pixel SP3. Furthermore, the portion of the light-emitting layer EML disposed in the second sub-pixel SP2 is disposed on the third conductive layer 743 between the second sub-pixel SP2 and the third sub-pixel SP3. Therefore, the third conductive layer 743, the organic layer 122, and the cathode 123 disposed on the third conductive layer 743 can form a third auxiliary light-emitting diode 753, and the third auxiliary light-emitting diode 753 can emit light with the same color as the second sub-pixel SP2.

[0161] In a display device 700 according to another exemplary embodiment of the present disclosure, a floating conductive layer 740 is further disposed between the third sub-pixel SP3 and the second sub-pixel SP2, and the conductive layer 740, the organic layer, and the cathode can serve as an auxiliary light-emitting diode 750. Therefore, when the third sub-pixel SP3 is driven, the current leaking from the third sub-pixel SP3 can flow through the conductive layer 740 disposed between the third sub-pixel SP3 and the second sub-pixel SP2 to the cathode disposed on the conductive layer 740. By doing so, when the third sub-pixel SP3 is driven, the leakage current flowing from the third sub-pixel SP3 to the second sub-pixel SP2 can be reduced. Therefore, in a display device 700 according to another exemplary embodiment of the present disclosure, the conductive layer 740 is further disposed between the second sub-pixel SP2 and the third sub-pixel SP3 to reduce the leakage current flowing from the first sub-pixel SP1, which has the highest on-state voltage, to the second sub-pixel SP2 and the third sub-pixel SP3. At the same time, it reduces leakage current flowing from the third sub-pixel SP3, which has a higher on-state voltage, to the second sub-pixel SP2, and minimizes display quality degradation caused by color mixing, spots, or abnormal colors.

[0162] Furthermore, in a display device 700 according to another exemplary embodiment of this disclosure, the conductive layer 740 may be configured to be adjacent to a sub-pixel SP having a relatively low on-state voltage. That is, the conductive layer 740 is configured to be closer to the second sub-pixel SP2 with a lower on-state voltage between the third sub-pixel SP3 and the second sub-pixel SP2, in order to minimize the reduction in brightness of the third sub-pixel SP3.

[0163] Figure 8 This is a cross-sectional view of a display device according to yet another exemplary embodiment of the present disclosure. Figure 8 Display device 800 and Figure 7 The only difference between the display device 700 and the display device 700 is that it also includes a groove pattern 860, but the rest of the structure is basically the same, and redundant descriptions will be omitted.

[0164] Reference Figure 8 A trench pattern 860 is disposed in the embankment 116. Specifically, the trench pattern 860 may be disposed between the first sub-pixel SP1 and the conductive layer 740. The trench pattern 860 is disposed on the embankment 116 between the first sub-pixel SP1 and the second sub-pixel SP2. However, it is not limited thereto; the trench pattern 860 may also be disposed between the first sub-pixel SP1 and the third sub-pixel SP6, and between the second sub-pixel SP2 and the third sub-pixel SP3.

[0165] Reference Figure 8The trench pattern 860 may be V-shaped, having multiple inclined surfaces extending from the upper surface of the embankment 116. Common organic layers HIL, HTL, and ETL disposed on the embankment 116 may be disposed on the trench pattern 860. Although in Figure 8 The diagram shows that the light-emitting layer EML is disposed on the groove pattern 860, but the light-emitting layer EML may not be disposed on the groove pattern 860 or may only be disposed on a portion of the light-emitting layer EML, but is not limited thereto.

[0166] In a display device 800 according to another exemplary embodiment of the present disclosure, a trench pattern 860 is disposed on a dam 116 located between a first sub-pixel SP1 and a second sub-pixel SP2 to minimize leakage current through the common organic layers HIL, HTL, and ETL of the plurality of light-emitting diodes 120. First, an organic layer 122 is disposed on the dam 116 in which the trench pattern 860 is formed, such that the organic layer 122 is also disposed within the trench pattern 860. As the organic layer 122 is deposited along the trench pattern 860, the common organic layers HIL, HTL, and ETL of the organic layer 122, which serve as the path for leakage current, are formed along the trench pattern 860 and the dam 116. Therefore, the length of the common organic layers HIL, HTL, and ETL increases, and the length of the leakage current path increases. Therefore, the length of the organic layer 122, which serves as the path through which leakage current flows, increases due to the increased trench pattern 860, thereby increasing the resistance of the organic layer 122. Therefore, leakage current flowing to the light-emitting diodes 120 of adjacent sub-pixels SP can be reduced. Therefore, in a display device 800 according to another exemplary embodiment of the present disclosure, a trench pattern 860 is provided in a dam 116 between a first sub-pixel SP1 and a second sub-pixel SP2 to minimize leakage current through the common organic layers HIL, HTL and ETL of the plurality of light-emitting diodes 120.

[0167] Figure 9 This is a cross-sectional view of a display device according to yet another exemplary embodiment of the present disclosure. Figure 9 Display device 900 and Figure 7 The only difference in the display device is that it also includes a tapered pattern 970, but the other configurations are basically the same, so redundant descriptions will be omitted.

[0168] Reference Figure 9 The tapered pattern 970 is also disposed on the embankment 116 between the first sub-pixel SP1 and the second sub-pixel SP2. The tapered pattern 970 is disposed on the embankment 116 between the first sub-pixel SP1 and the conductive layer 740. However, it is not limited to this; the tapered pattern 970 may also be disposed between the third sub-pixel SP3 and the conductive layer 740. Furthermore, in Figure 9Although a conical pattern 970 is shown to be provided on the embankment 116, it is not limited thereto, and an inverted conical pattern may be provided on the embankment 116.

[0169] Reference Figure 9 The common organic layers HIL, HTL, and ETL, set on the embankment 116, can be set on the conical pattern 970. Although in Figure 9 The diagram shows that the light-emitting layer EML is disposed on the conical pattern 970. It is also possible that the light-emitting layer EML is not disposed on the conical pattern 970 or only a portion of the light-emitting layer EML is disposed thereon, but it is not limited thereto.

[0170] In a display device 900 according to another exemplary embodiment of the present disclosure, a tapered pattern 970 is disposed in a dam 116 between a first sub-pixel SP1 and a conductive layer 740 to minimize leakage current through the common organic layers HIL, HTL, and ETL of the plurality of light-emitting diodes 120. First, an organic layer 122 is disposed on the dam 116 in which the tapered pattern 970 is formed, such that the organic layer 122 is also disposed within the tapered pattern 970. Since the organic layer 122 is deposited along the tapered pattern 970, the common organic layers HIL, HTL, and ETL of the organic layer 122, which serve as the path for leakage current, are formed along the tapered pattern 970 and the dam 116. Therefore, the length of the common organic layers HIL, HTL, and ETL can be increased, and the length of the leakage current path can be increased. Therefore, the resistance of the organic layer 122 can be increased due to the increased length of the tapered pattern 970. Therefore, leakage current flowing to the light-emitting diodes 120 of adjacent sub-pixels SP can be reduced. Therefore, in a display device 900 according to another exemplary embodiment of the present disclosure, a tapered pattern 970 is provided in the dam 116 between the first sub-pixel SP1 and the conductive layer 740 to minimize leakage current through the common organic layers HIL, HTL and ETL of the plurality of light-emitting diodes 120.

[0171] Figure 10 This is a cross-sectional view of a display device according to yet another exemplary embodiment of the present disclosure. Figure 10 Display device 1000 and Figure 9 The only difference in the display device is that it also includes the groove pattern 1060, but the other configurations are basically the same, so redundant descriptions will be omitted.

[0172] Reference Figure 10The trench pattern 1060 is also disposed in the embankment 116. Specifically, the trench pattern 1060 may be disposed between the first sub-pixel SP1 and the conductive layer 740. The trench pattern 1060 is disposed on the embankment 116 between the first sub-pixel SP1 and the second sub-pixel SP2. However, it is not limited to this, and the trench pattern 1060 may also be disposed between the first sub-pixel SP1 and the third sub-pixel SP3, and between the second sub-pixel SP2 and the third sub-pixel SP3.

[0173] Reference Figure 10 The trench pattern 1060 may be V-shaped, having multiple inclined surfaces extending from the upper surface of the embankment 116. Common organic layers HIL, HTL, and ETL disposed on the embankment 116 may be disposed on the trench pattern 1060.

[0174] Reference Figure 10 The tapered pattern 970 is also disposed on the embankment 116 between the first sub-pixel SP1 and the second sub-pixel SP2. The tapered pattern 970 is disposed on the embankment 116 between the first sub-pixel SP1 and the groove pattern 1060. However, it is not limited to this, and the tapered pattern 970 may also be disposed between the third sub-pixel SP3 and the groove pattern 1060. Furthermore, in Figure 10 Although a conical pattern 970 is shown disposed on the embankment 116, it is not limited thereto, and an inverted conical pattern may also be disposed on the embankment 116. (See reference...) Figure 10 The common organic layers HIL, HTL and ETL set on the embankment 116 can be set on the conical pattern 970.

[0175] In a display device 1000 according to another exemplary embodiment of the present disclosure, a trench pattern 1060 and a tapered pattern 970 are disposed in a dam 116 between a first sub-pixel SP1 and a second sub-pixel SP2 to minimize leakage current through the common organic layers HIL, HTL, and ETL of the plurality of light-emitting diodes 120. Specifically, since an organic layer 122 is disposed on the dam 116 on which the trench pattern 1060 and the tapered pattern 970 are formed, the common organic layers HIL, HTL, and ETL of the organic layer 122, which serve as the path for leakage current, are formed along the trench pattern 1060, the tapered pattern 970, and the dam 116. Therefore, the length of the common organic layers HIL, HTL, and ETL can be increased, and the length of the leakage current path can be increased. Thus, the increased length of the organic layer 122, which serves as the path through which leakage current flows, increases the resistance of the organic layer 122. As a result, leakage current flowing to the light-emitting diodes 120 of adjacent sub-pixels SP can be reduced. Therefore, in a display device 1000 according to another exemplary embodiment of the present disclosure, a trench pattern 1060 and a tapered pattern 970 are disposed between a first sub-pixel SP1 and a second sub-pixel SP2 to minimize leakage current through the common organic layers HIL, HTL and ETL of the plurality of light-emitting diodes 120.

[0176] Exemplary embodiments of this disclosure can also be described as follows:

[0177] According to one aspect of this disclosure, a display device includes: a substrate defining a plurality of sub-pixels; a plurality of light-emitting diodes disposed within the plurality of sub-pixels, sharing a common organic layer and a cathode, and each having a separate light-emitting layer and an anode; a conductive layer disposed between the plurality of sub-pixels; and a dam disposed below the cathode between the plurality of light-emitting diodes and exposing the anode and the conductive layer, wherein the plurality of sub-pixels includes a first sub-pixel and a second sub-pixel with an on-state voltage lower than that of the first sub-pixel, and the conductive layer is disposed between the first sub-pixel and the second sub-pixel, closer to the second sub-pixel.

[0178] The display device may also include a planarization layer disposed between a substrate and a plurality of light-emitting diodes, wherein an anode and a conductive layer are disposed on the planarization layer.

[0179] The light-emitting layer in the second sub-pixel can be placed on the conductive layer.

[0180] The width of the light-emitting layer disposed on the conductive layer can be greater than the width of the conductive layer exposed by the dike.

[0181] The first sub-pixel can be a blue sub-pixel, and the second sub-pixel can be a red sub-pixel or a green sub-pixel.

[0182] The plurality of sub-pixels may further include a third sub-pixel, the third sub-pixel having an on-state voltage lower than that of the first sub-pixel and higher than that of the second sub-pixel. The conductive layer may include: a first conductive layer configured to be closer to the second sub-pixel between the first and second sub-pixels; and a second conductive layer configured to be closer to the third sub-pixel between the first and third sub-pixels.

[0183] The conductive layer may further include a third conductive layer, which is positioned closer to the second sub-pixel between the second sub-pixel and the third sub-pixel.

[0184] The first sub-pixel can be a blue sub-pixel, the second sub-pixel can be a red sub-pixel, and the third sub-pixel can be a green sub-pixel.

[0185] The display device may also include a groove pattern disposed on the embankment and between the first sub-pixel and the conductive layer.

[0186] The display device may also include a tapered pattern or an inverted tapered pattern disposed on a dam located between the first sub-pixel and the trench pattern or between the trench pattern and the conductive layer.

[0187] The display device may also include a tapered pattern or an inverted tapered pattern disposed on a dam located between the first sub-pixel and the conductive layer.

[0188] The conductive layer may be electrically floating.

[0189] According to another aspect of this disclosure, a display device may include: a substrate; a plurality of sub-pixels disposed on the substrate and including a first sub-pixel and a second sub-pixel, wherein the on-state voltage of the second sub-pixel is lower than the on-state voltage of the first sub-pixel; a plurality of light-emitting diodes (LEDs) including an anode, a light-emitting layer, a common organic layer, and a cathode, and disposed in each of the first and second sub-pixels; and a conductive layer disposed between the first and second sub-pixels, closer to the second sub-pixel. The plurality of LEDs share the common organic layer and the cathode.

[0190] The anode and conductive layer can be disposed on the same layer and formed of the same material.

[0191] The light-emitting layer disposed in the second sub-pixel can extend onto the conductive layer, so that the conductive layer, the light-emitting layer, the common organic layer and the cathode form an auxiliary light-emitting diode.

[0192] The emitting area of ​​the auxiliary light-emitting diode can be smaller than the emitting area of ​​each of the multiple light-emitting diodes.

[0193] The display device may further include a third sub-pixel, the third sub-pixel having an on-state voltage lower than that of the first sub-pixel and higher than that of the second sub-pixel. The auxiliary light-emitting diode may include: a first auxiliary light-emitting diode that emits light having the same color as the second sub-pixel between the first and second sub-pixels; and a second auxiliary light-emitting diode that emits light having the same color as the third sub-pixel between the first and third sub-pixels.

[0194] The auxiliary light-emitting diode may also include a third auxiliary light-emitting diode that emits light with the same color as the second sub-pixel between the second and third sub-pixels.

[0195] The first sub-pixel may include a blue emitting layer, and the second sub-pixel may include a red emitting layer or a green emitting layer.

[0196] The display device may further include: a third sub-pixel, wherein the on-state voltage of the third sub-pixel is lower than the on-state voltage of the first sub-pixel and higher than the on-state voltage of the second sub-pixel. The conductive layer may include: a first conductive layer configured to be closer to the second sub-pixel between the first and second sub-pixels; and a second conductive layer configured to be closer to the third sub-pixel between the first and third sub-pixels.

[0197] The conductive layer may further include a third conductive layer, which is positioned closer to the second sub-pixel between the second sub-pixel and the third sub-pixel.

[0198] The first sub-pixel may include a blue emitting layer, the second sub-pixel may include a red emitting layer, and the third sub-pixel may include a green emitting layer.

[0199] The display device may further include: a dam configured to define the positions of a plurality of subpixels on a substrate and expose a conductive layer; and a trench pattern disposed on the dam located between the first subpixel and the conductive layer.

[0200] The display device may also include a tapered pattern or an inverted tapered pattern disposed on a dam located between the first sub-pixel and the groove pattern.

[0201] The display device may further include: a dam configured to define the positions of a plurality of subpixels on a substrate and expose a conductive layer; and a tapered pattern or an inverted tapered pattern disposed on the dam located between the first subpixel and the second subpixel.

[0202] The conductive layer can be electrically floating.

[0203] Cross-references to related applications

[0204] This application claims priority to Korean Patent Application No. 10-2020-0185235, filed with the Korean Intellectual Property Office on December 28, 2020, the disclosure of which is incorporated herein by reference.

Claims

1. A display device, the display device comprising: A substrate, wherein a plurality of sub-pixels are defined in the substrate; Multiple light-emitting diodes are disposed in multiple sub-pixels, sharing a common organic layer and a cathode, and each having a separate light-emitting layer and an anode; A conductive layer is disposed between the plurality of sub-pixels; as well as A dam is disposed below the cathode located between the plurality of light-emitting diodes, and exposes the anode and the conductive layer. The plurality of sub-pixels includes a first sub-pixel and a second sub-pixel, wherein the on-state voltage of the second sub-pixel is lower than that of the first sub-pixel, and the conductive layer is positioned closer to the second sub-pixel than the first sub-pixel. The light-emitting layer disposed in the second sub-pixel extends onto the conductive layer.

2. The display device according to claim 1, further comprising: A planarization layer is disposed between the substrate and the plurality of light-emitting diodes. The anode and the conductive layer are disposed on the planarization layer.

3. The display device of claim 1, wherein, The width of the light-emitting layer disposed on the conductive layer is greater than the width of the conductive layer exposed by the embankment.

4. The display device of claim 1, wherein, The first sub-pixel is a blue sub-pixel, and the second sub-pixel is a red or green sub-pixel.

5. The display device according to claim 1, wherein, The plurality of sub-pixels also includes a third sub-pixel, wherein the on-state voltage of the third sub-pixel is lower than the on-state voltage of the first sub-pixel but higher than the on-state voltage of the second sub-pixel, and The conductive layer includes: A first conductive layer, wherein the first conductive layer is configured to be closer to the second sub-pixel between the first sub-pixel and the second sub-pixel; and A second conductive layer is configured to be located closer to the third sub-pixel between the first sub-pixel and the third sub-pixel.

6. The display device according to claim 5, wherein, The conductive layer further includes a third conductive layer, which is configured to be closer to the second sub-pixel between the second sub-pixel and the third sub-pixel.

7. The display device according to claim 5, wherein, The first sub-pixel is a blue sub-pixel, the second sub-pixel is a red sub-pixel, and the third sub-pixel is a green sub-pixel.

8. The display device according to claim 1, further comprising: A groove pattern is disposed on the embankment and between the first sub-pixel and the conductive layer.

9. The display device according to claim 8, further comprising: A conical pattern or an inverted conical pattern is disposed on the embankment located between the first sub-pixel and the trench pattern or between the trench pattern and the conductive layer.

10. The display device according to claim 1, further comprising: A conical pattern or an inverted conical pattern is disposed on the embankment located between the first sub-pixel and the conductive layer.

11. The display device according to claim 1, wherein, The conductive layer is electrically floated.

12. A display device, the display device comprising: substrate; Multiple sub-pixels are disposed on the substrate and include a first sub-pixel and a second sub-pixel, wherein the on-state voltage of the second sub-pixel is lower than the on-state voltage of the first sub-pixel; A plurality of light-emitting diodes, each comprising an anode, a light-emitting layer, a common organic layer, and a cathode, and disposed in each of the first sub-pixel and the second sub-pixel; as well as A conductive layer, wherein the conductive layer is positioned closer to the second sub-pixel between the first sub-pixel and the second sub-pixel. The plurality of light-emitting diodes share the common organic layer and the cathode, and The light-emitting layer disposed in the second sub-pixel extends onto the conductive layer.

13. The display device according to claim 12, wherein, The anode and the conductive layer are disposed on the same layer and formed of the same material.

14. The display device according to claim 12, wherein, The conductive layer, the light-emitting layer, the common organic layer, and the cathode form an auxiliary light-emitting diode.

15. The display device according to claim 14, wherein, The emission area of ​​the auxiliary light-emitting diode is smaller than the emission area of ​​each of the plurality of light-emitting diodes.

16. The display device according to claim 14, further comprising: The third sub-pixel has a turn-on voltage lower than that of the first sub-pixel but higher than that of the second sub-pixel. The auxiliary light-emitting diode includes: A first auxiliary light-emitting diode emits light of the same color as the second sub-pixel between the first sub-pixel and the second sub-pixel; and A second auxiliary light-emitting diode emits light of the same color as the third sub-pixel between the first sub-pixel and the third sub-pixel.

17. The display device according to claim 16, wherein, The auxiliary light-emitting diode further includes a third auxiliary light-emitting diode, which emits light with the same color as the second sub-pixel between the second sub-pixel and the third sub-pixel.

18. The display device according to claim 12, wherein, The first sub-pixel includes a blue light-emitting layer, and the second sub-pixel includes a red light-emitting layer or a green light-emitting layer.

19. The display device according to claim 12, further comprising: The third sub-pixel has a turn-on voltage lower than that of the first sub-pixel but higher than that of the second sub-pixel. The conductive layer includes: A first conductive layer, wherein the first conductive layer is configured to be closer to the second sub-pixel between the first sub-pixel and the second sub-pixel; and A second conductive layer is configured to be located closer to the third sub-pixel between the first sub-pixel and the third sub-pixel.

20. The display device according to claim 19, wherein, The conductive layer further includes a third conductive layer, which is configured to be located closer to the second sub-pixel between the second sub-pixel and the third sub-pixel.

21. The display device according to claim 19, wherein, The first sub-pixel includes a blue light-emitting layer, the second sub-pixel includes a red light-emitting layer, and the third sub-pixel includes a green light-emitting layer.

22. The display device according to claim 12, further comprising: A dam portion is configured to define the positions of the plurality of sub-pixels on the substrate and expose the conductive layer; as well as A groove pattern is provided on the embankment located between the first sub-pixel and the second sub-pixel.

23. The display device according to claim 22, further comprising: A conical pattern or an inverted conical pattern is disposed on the embankment located between the first sub-pixel and the groove pattern.

24. The display device according to claim 12, further comprising: A dam portion is configured to define the positions of the plurality of sub-pixels on the substrate and expose the conductive layer; as well as A conical pattern or an inverted conical pattern is disposed on the embankment located between the first sub-pixel and the second sub-pixel.

25. The display device according to claim 12, wherein, The conductive layer is electrically floated.

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