Light emitting display device

Abstract

A light emitting display device includes a first pixel including a first light emitting device and a first pixel driving circuit including the first light emitting device, a second pixel including a second light emitting device and a second pixel driving circuit including the second light emitting device, a repair transistor connected between the first light emitting device and the second light emitting device, and a repair control transistor connected to a gate of the repair transistor.

Description

Technical Field

[0001] This disclosure relates to a light-emitting display device. Background Technology

[0002] A light-emitting display panel includes pixels with light-emitting devices. Light-emitting display panels can be manufactured using a base substrate such as glass or a thin film, or using a silicon substrate.

[0003] In the process of manufacturing light-emitting display panels, defective pixels may occur for various reasons.

[0004] Defective pixels in a light-emitting display panel, including the base substrate, can be physically repaired using a laser repair process and can be driven normally via a soldering process. However, complex processes such as repair and soldering should be performed to drive the defective pixels normally.

[0005] Defective pixels in light-emitting display panels, including silicon substrates, may be darkened by using laser repair processes or may not be able to be properly driven by soldering processes. Summary of the Invention

[0006] Therefore, this disclosure aims to provide a light-emitting display device that substantially eliminates one or more problems caused by the limitations and disadvantages of the prior art.

[0007] One aspect of this disclosure relates to providing a light-emitting display device that can properly drive defective pixels by using a repair transistor included in a pixel driving circuit.

[0008] Further advantages and features of this disclosure will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art upon examination of the following description, or may be learned from practice of this disclosure. The objects and other advantages of this disclosure may be realized and obtained by means of the structures particularly pointed out in the written description, its claims, and the accompanying drawings.

[0009] To achieve these and other advantages, and in accordance with the purposes of this disclosure, as embodied and broadly described herein, a light-emitting display device is provided, comprising: a first pixel including a first light-emitting device and a first pixel driving circuit for driving the first light-emitting device; a second pixel including a second light-emitting device and a second pixel driving circuit for driving the second light-emitting device; a repair transistor connected between the first light-emitting device and the second light-emitting device; and a repair control transistor connected to the gate of the repair transistor.

[0010] It should be understood that the foregoing general description and the following detailed description of this disclosure are exemplary and explanatory, and are intended to provide further explanation of the claimed disclosure. Attached Figure Description

[0011] The accompanying drawings, included to provide a further understanding of this disclosure and incorporated into and constituting a part of this application, illustrate embodiments of this disclosure and, together with the specification, serve to explain the principles of this disclosure. In the drawings:

[0012] Figure 1 This is an example diagram illustrating the configuration of a light-emitting display device according to the present disclosure;

[0013] Figure 2 This is an example diagram illustrating the structure of a pixel applied to a light-emitting display device according to the present disclosure;

[0014] Figure 3 This is an example diagram illustrating the configuration of a controller applied to a light-emitting display device according to the present disclosure;

[0015] Figure 4 This is an example diagram illustrating the configuration of a gating driver applied to a light-emitting display device according to the present disclosure;

[0016] Figure 5 This is an example diagram showing a fuse applied to a light-emitting display device according to the present disclosure;

[0017] Figure 6 This is an example diagram illustrating the structure of a light-emitting display panel applied to a light-emitting display device according to the present disclosure;

[0018] Figures 7A to 7D This is an example diagram used to describe the features of a repair transistor applied to a light-emitting display device according to this disclosure;

[0019] Figure 8 This is an example diagram illustrating a method for changing the threshold voltage of a repair transistor connected to a normal pixel and a defective pixel in a light-emitting display device according to the present disclosure;

[0020] Figure 9 This indicates the driving during the display period. Figure 8 Example diagram of the method of the light-emitting display device shown; and

[0021] Figure 10 and Figure 11 This is an example diagram used to describe the refresh period applied to a light-emitting display device according to this disclosure. Detailed Implementation

[0022] Exemplary embodiments of this disclosure will now be described in detail, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numerals are used in all the drawings to denote the same or similar parts.

[0023] The advantages and features of this disclosure, and its implementation methods, will be illustrated by the following description of embodiments with reference to the accompanying drawings. However, this disclosure may be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to make this disclosure thorough and complete, and to fully convey the scope of this disclosure to those skilled in the art. Furthermore, this disclosure is limited only by the scope of the claims.

[0024] The shapes, dimensions, scales, angles, and quantities disclosed in the accompanying drawings used to describe embodiments of this disclosure are merely examples, and therefore, this disclosure is not limited to the details shown. The same reference numerals always denote the same elements. In the following description, detailed descriptions that determine relevant known functions or configurations will be omitted where such descriptions unnecessarily obscure the essential points of this disclosure. When using the terms "comprising," "having," and "including" as described in this specification, additional parts may be added unless "only" is used. Singular terms may include plural forms unless otherwise stated.

[0025] When interpreting a component, it is interpreted as including a range of errors or tolerances, even though there is no explicit description of such a range of errors or tolerances.

[0026] When describing positional relationships, for example, when the positional relationship between two components is described as "above", "over", "below", and "beside", one or more other components may be positioned between the two components, unless more restrictive terms such as "only" or "directly" are used.

[0027] When describing temporal relationships, such as when time sequence is described as "after", "following", "next", and "before", discontinuous situations may be included unless more restrictive terms such as "exactly", "immediately", or "directly" are used.

[0028] It should be understood that although the terms “first,” “second,” etc., may be used herein to describe various elements, these elements should not be limited by these terms. These terms are used only to distinguish one element from another. For example, without departing from the scope of this disclosure, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element.

[0029] In describing the elements of this disclosure, the terms “first,” “second,” “A,” “B,” “(a),” “(b),” etc., may be used. These terms are intended to identify corresponding elements from other elements, and the basis, order, or number of corresponding elements shall not be limited by these terms. The expression “connected,” “joined,” or “adhered” to another element or layer may refer to an element or layer not only directly connected or adhered to another element or layer, but also indirectly connected or adhered to another element or layer, wherein one or more intermediate elements or layers are “set” or “inserted” between elements or layers, unless otherwise stated.

[0030] The term "at least one" should be understood as any and all combinations including one or more of the related listed items. For example, "at least one of the first, second, and third items" means a combination of all items proposed from two or more of the first, second, and third items, as well as the first, second, or third item.

[0031] Features of the various embodiments of this disclosure may be partially or entirely linked or combined with each other, and may be interoperable with each other differently and technically driven, as will be fully understood by those skilled in the art. Embodiments of this disclosure may be performed independently of each other, or may be performed together in an interdependent relationship.

[0032] In the following, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0033] Figure 1 This is an example diagram illustrating the configuration of a light-emitting display device according to the present disclosure. Figure 2 This is an example diagram illustrating the structure of pixels applied to a light-emitting display device according to the present disclosure. Figure 3 This is an example diagram illustrating the configuration of a controller applied to a light-emitting display device according to the present disclosure. Figure 4 This is an example diagram illustrating the configuration of a gating driver applied to a light-emitting display device according to the present disclosure. In the following, reference will be made to... Figures 1 to 4 The basic structure of the light-emitting display device according to this disclosure is described.

[0034] The light-emitting display device according to this disclosure can be configured with various electronic devices. These electronic devices may include, for example, smartphones, tablet PCs, televisions (TVs), and monitors.

[0035] like Figure 1As shown, the light-emitting display device according to this disclosure may include: a light-emitting display panel 100, which includes a display area 120 for displaying images and a non-display area 130 disposed outside the display area 120; a gating driver 200, which provides gating signals to a plurality of gating lines GL1 to GLg disposed in the display area 120 of the light-emitting display panel 100; a data driver 300, which provides data voltage to a plurality of data lines DL1 to DLd disposed in the light-emitting display panel 100; a controller 400, which controls the driving of the gating driver 200 and the data driver 300; and a power supply 500, which supplies power to the controller 400, the gating driver 200, the data driver 300 and the light-emitting display panel 100.

[0036] First, the light-emitting display panel 100 may include a display area 120 and a non-display area 130. Selection lines GL1 to GLG, data lines DL1 to DLd, and pixels 110 can be set in the display area 120. Therefore, the display area 120 can display an image. Here, g and d can each be a natural number. The non-display area 130 may surround the outside of the display area 120.

[0037] like Figure 2 As shown, the pixel 110 included in the light-emitting display panel 100 may include a light-emitting area, which includes a pixel driving circuit PDC and a light-emitting device ED. The pixel driving circuit PDC includes a switching transistor Tsw1, a storage capacitor Cst, a driving transistor Tdr, and a sensing transistor Tsw2.

[0038] The first terminal of the driving transistor Tdr can be connected to the high-voltage power line PLA through which the high voltage EVDD is provided, and the second terminal of the driving transistor Tdr can be connected to the light-emitting device ED.

[0039] The first terminal of the switching transistor Tsw1 can be connected to the data line DL, the second terminal of the switching transistor Tsw1 can be connected to the gate of the driving transistor Tdr, and the gate of the switching transistor Tsw1 can be connected to the gate line GL.

[0040] The data voltage Vdata can be provided to the data line DL, and the strobe signal GS can be provided to the strobe line GL.

[0041] The sensing transistor Tsw2 can be used to measure the threshold voltage or mobility of the driving transistor. The first terminal of the sensing transistor Tsw2 can be connected to the second terminal of the driving transistor Tdr and the light-emitting device ED. The second terminal of the sensing transistor Tsw2 can be connected to the sensing line SL through which the reference voltage Vref is provided. The gate of the sensing transistor Tsw2 can be connected to the sensing control line through which the sensing control signal is provided.

[0042] The sensing line SL can be connected to the data driver 300, and can also be connected to the power supply 500 through the data driver 300. That is, the reference voltage Vref provided from the power supply 500 can be provided to the pixel through the sensing line SL, and the sensing signal transmitted from the pixel can be converted into a digital signal by the data driver 300.

[0043] In this configuration, the gating line GL can function as a sensing control line. That is, the gates of the sensing transistor Tsw2 and the switching transistor Tsw1 can be connected together to the gating line GL. Therefore, the gating signal GS can be used as a sensing control signal.

[0044] However, the sensing control line can be a separate line independent of the gate line GL, and the sensing control signal can be provided through a separately supplied sensing control line.

[0045] The structure of pixel 110 applied in this disclosure is not limited to Figure 2 The structure shown. Therefore, the structure of pixel 110 can be changed to various types.

[0046] The data driver 300 can be mounted on a chip-on-a-chip (COF) attached to the light-emitting display panel 100, or it can be directly mounted in the light-emitting display panel 100.

[0047] Data driver 300 can provide data voltage Vdata to data lines DL1 to DLd.

[0048] The data driver 300 can convert the sensing signal received through the sensing line SL into a digital signal and transmit the digital signal to the controller 400.

[0049] The controller 400 can re-align the input video data transmitted from the external system using a timing synchronization signal transmitted from the external system, and can generate a data control signal DCS to be provided to the data driver 300 and a gating control signal GCS to be provided to the gating driver 200.

[0050] Therefore, such as Figure 3As shown, the controller 400 may include: a data aligner 430, which realigns input video data to generate image data Data and provides the image data Data to the data driver 300; a control signal generator 420, which generates a gating control signal GCS and a data control signal DCS using a timing synchronization signal; an input unit 410, which receives the timing synchronization signal and input video data transmitted from an external system and transmits the timing synchronization signal and input video data to the data aligner and the control signal generator, respectively; and an output unit 440, which provides the image data Data generated by the data aligner 430 and the data control signal DCS generated by the control signal generator to the data driver 300, and provides the gating control signal GCS generated by the control signal generator 420 to the gating driver 200.

[0051] The controller 400 may include a storage unit 450 for storing various information.

[0052] An external system can perform the functions of the drive controller 400 and the electronic device. For example, when the electronic device is a TV, the external system can receive various audio, video, and text information via a communication network and can transmit the received video information to the controller 400. In this case, the image information may include input video data.

[0053] The power supply 500 can generate various types of electricity and can supply the generated electricity to the controller 400, the strobe driver 200, the data driver 300 and the light-emitting display panel 100.

[0054] Finally, the gate driver 200 can be configured as an integrated circuit (IC) and mounted in the non-display area 130. Alternatively, the gate driver 200 can be directly embedded in the non-display area 130 using a gate-in-panel (GIP) type. When using the GIP type, the transistors constituting the gate driver 200 can be fabricated in the non-display area using the same process as the transistors included in each pixel 110.

[0055] The strobe driver 200 can provide strobe pulses GP1 to GPg or strobe cutoff signals to strobe lines GL1 to GLg. The strobe signal GS can include strobe pulses GP and strobe cutoff signals.

[0056] That is, the gating driver 200 can provide a gating signal GS to the gating line during the display period of the image displayed by the pixel 110.

[0057] Therefore, such as Figure 4 As shown, the strobe driver 200 may include multiple stages 201.

[0058] Each stage 201 can be connected to at least one strobe line GL. Each stage 201 can be driven by a start signal transmitted from the controller 400, or by a start signal transmitted from the previous stage or the next stage.

[0059] The strobe driver 200 may further include multiple repair levels 202. However, the functionality of the repair level 202 can be performed through level 201.

[0060] That is, the strobe driver 200 may include a stage 201 for outputting repair control signals RCS1 to RCSg / 2 and strobe pulses GP1 to GPg.

[0061] However, as Figure 4 As shown, the gating driver 200 may include a stage 201 that outputs gating pulses GP1 to GPg and a repair stage 202 that outputs repair control signals RCS1 to RCSg / 2.

[0062] That is, during the display period of the image, the gating driver 200 can output gating pulses GP1 to GPg sequentially to gating lines GL1 to GLg through the use stage 201, and during the refresh period of the refresh operation, the gating driver 200 can output repair control signals RCS1 to RCSg / 2 sequentially through the use of the repair stage 202.

[0063] The refresh operations and functions for each repair level 202 will be described below.

[0064] Figure 5 This is an example diagram showing a fuse applied to a light-emitting display device according to the present disclosure.

[0065] As described above, pixel 110 may include a driving transistor Tdr and a light-emitting device ED.

[0066] in this case, Figure 2 and Figure 5 The fuse FU shown can be connected between the driving transistor Tdr and the light-emitting device ED.

[0067] The fuse FU can be disposed between the main line 11 and the auxiliary line 12, which have a first width A. The auxiliary line 12 is disposed between the main lines 11 and has a second width B that is less than the first width A.

[0068] One of the main lines 11 can be connected to the second terminal of the driving transistor Tdr, while the other main line 11 can be connected to the anode AE ​​of the light-emitting device ED.

[0069] A fuse FU can be used to separate the light-emitting device ED included in a defective pixel from the driving transistor Tdr included in the defective pixel. For example, when... Figure 5When the fuse FU shown in (a) provides overvoltage or overcurrent, the resistance of the auxiliary line 12, which has a second width B that is smaller than the first width A, may increase significantly. Therefore, the auxiliary line 12 can be as follows: Figure 5 As shown in (b), it is cut off. Therefore, the driving transistor Tdr and the light-emitting device ED included in the defective pixel can be separated from each other.

[0070] In this case, to prevent fragments of the cut auxiliary line 12 from transferring to other components near the fuse FU, a shielding layer 13 may be formed near the fuse FU. The shielding layer 13 may be formed of a metal or an inorganic layer.

[0071] Figure 6 This is an example diagram illustrating the structure of a light-emitting display panel applied to a light-emitting display device according to the present disclosure, and specifically showing a first pixel P1 and a second pixel P2 adjacent to each other along the sensing line SL. In the following description, a pixel 110 connected to the 2n-1th gate line GL2n-1 may be referred to as the first pixel P1, and a pixel 110 connected to the 2nth gate line GL2n may be referred to as the second pixel P2. Here, n may be an odd number less than g.

[0072] As per the above reference Figure 2 The pixel 110 included in the light-emitting display panel 100 may include a light-emitting area and a light-emitting device ED. The light-emitting area includes a pixel driving circuit PDC. The pixel driving circuit PDC includes a switching transistor Tsw1, a storage capacitor Cst, a driving transistor Tdr, a sensing transistor Tsw2, and a fuse FU.

[0073] In the following description, the pixel driving circuit PDC included in the first pixel P1 can be referred to as the first pixel driving circuit PDC1, and the pixel driving circuit PDC included in the second pixel P2 can be referred to as the second pixel driving circuit PDC2. The switching transistor Tsw1, storage capacitor Cst, driving transistor Tdr, sensing transistor Tsw2, and fuse FU included in the first pixel driving circuit PDC1 can be referred to as the first switching transistor Tsw1a, the first storage capacitor Cst, the first driving transistor Tdr1, the first sensing transistor Tsw2a, and the first fuse FU1, respectively. The switching transistor Tsw1, storage capacitor Cst, driving transistor Tdr, sensing transistor Tsw2, and fuse FU included in the second pixel driving circuit PDC2 can be referred to as the second switching transistor Tsw1b, the second storage capacitor Cstb, the second driving transistor Tdr2, the second sensing transistor Tsw2b, and the second fuse FU2, respectively.

[0074] like Figure 6As shown, the light-emitting display device may include: a first pixel P1, which includes a first light-emitting device ED1 and a first pixel driving circuit PDC1 that drives the first light-emitting device ED1; a second pixel P2, which includes a second light-emitting device ED2 and a second pixel driving circuit PDC2 that drives the second light-emitting device ED2; an nth repair transistor Trn, which is connected between the first light-emitting device ED1 and the second light-emitting device ED2; and an nth repair control transistor Trcn connected to the gate of the nth repair transistor Trn.

[0075] First, each of the first pixel P1 and the second pixel P2 can be referenced above. Figure 2 One of the 110 pixels described. Therefore, its detailed description is omitted.

[0076] The first electrode of the nth repair transistor Trn can be connected to the first anode AE1 of the first light-emitting device ED1, the second electrode of the nth repair transistor Trn can be connected to the second anode AE2 of the second light-emitting device ED2, and the gate of the nth repair transistor Trn can be connected to the nth repair control transistor Trcn.

[0077] That is, the nth repair transistor Trn can be connected to two adjacent pixels, specifically, it can be connected to the anode AE ​​included in the two pixels.

[0078] The nth repair transistor Trn can be turned on or off by the voltage provided by the nth repair control transistor Trcn.

[0079] In this case, the first fuse FU1 can be connected between the first driving transistor Tdr1 and the first anode AE1 of the first light-emitting device ED1, and the second fuse FU2 can be connected between the second driving transistor Tdr2 and the second anode AE2 of the second light-emitting device ED2.

[0080] Each of the first fuse FU1 and the second fuse FU2 can be as described above. Figure 5 The described fuse FU.

[0081] Therefore, one of the first main lines 11a constituting the first fuse FU1 can be connected to the first driving transistor Tdr1, and the other first main line 11a can be connected to the first anode AE1. One of the second main lines 11b constituting the second fuse FU2 can be connected to the second driving transistor Tdr2, and the other second main line 11b can be connected to the second anode AE2.

[0082] Finally, the gate of the nth repair control transistor Trcn can be connected to the nth repair control line RCLn, the first electrode of the nth repair control transistor Trcn can be connected to the gate of the nth repair transistor Trn, and the second electrode of the nth repair control transistor Trcn can be connected to the sensing line SL connected to the first pixel P1 and the second pixel P2. Figure 6 The nth repair control line RCLn is shown in the figure, which is set between the 2n-1th gating line GL2n-1 and the 2nth gating line GL2n.

[0083] In the following description, when it is necessary to describe all repair control lines including the nth repair control line RCLn, repair control lines may be used, and the reference numeral RCL denotes a repair control line. Furthermore, when it is necessary to describe all repair control signals including the nth repair control signal RCSn, repair control signals may be used, and the reference numeral RCS denotes a repair control signal.

[0084] The nth repair control line RCLn can be set in parallel with the 2n-1th gating line GL2n-1 and the 2nth gating line GL2n.

[0085] The nth repair control line RCLn can be connected to one of the stages 201 included in the gating driver 200. Stage 201 can output a gating signal GS to the gating line GL during the display period and can output the nth repair control signal RCSn to the nth repair control line RCLn during the refresh period. The nth repair control signal RCSn can be a signal used to turn on the nth repair control transistor Trcn. The signal used to turn off the nth repair control transistor Trcn can be referred to as the repair cutoff signal. In the following text, the common name for the nth repair control signal RCSn and the nth repair cutoff signal can be the nth repair signal RSn. However, when it is necessary to describe all repair control signals including the nth repair control signal RCSn, the term "repair control signal" can be used, and the reference numeral RCS denotes the repair control signal. Similarly, when it is necessary to describe all repair signals including the nth repair signal RSn, the term "repair signal" can be used, and the reference numeral RS denotes the repair signal.

[0086] That is, in the gating driver 200 which only includes stage 201, stage 201 can output gating pulses GP1 to GPg and repair control signals RCS1 to RCSg / 2, and for this purpose, gating lines GL1 to GLg and repair control line RCL can be connected to stage 201.

[0087] In this case, the number of repair control lines RCL can be half of the number of strobe lines GL1 to GLg. Therefore, repair control lines RCL can be connected only to odd-numbered or even-numbered levels.

[0088] However, as Figure 4 As shown, repair stages 202 and 201, which provide repair control signals RCS1 to RCSg / 2 to the repair control line RCL during the repair period, can be independently included in the strobe driver 200.

[0089] Repair stage 202 can sequentially generate repair control signals RCS1 to RCSg / 2 during the repair period, and can provide repair control signals RCS1 to RCSg / 2 to the repair control line RCL. Repair stage 202 can provide repair signal RS to all repair control lines RCL, which is used to turn on all repair control transistors Trc during the display period.

[0090] The repair period can represent the time period during which the image is displayed at pixel 110.

[0091] The refresh period can be the period from when the light-emitting display device is turned on until the start of the display period, or it can be the period from when the display period ends until the light-emitting display device is turned off. A light-emitting display device that is being turned on may indicate that the light-emitting display device is performing preparation operations for displaying an image, while a light-emitting display device that is being turned off may indicate that the light-emitting display device is simply supplied with standby power.

[0092] Figures 7A to 7D This is an example diagram used to describe the features of a repair transistor applied to a light-emitting display device according to this disclosure.

[0093] The threshold voltage of the repair transistor Tr can vary based on the level of voltage applied to the gate of the repair transistor Tr.

[0094] For example, when the threshold voltage of the repair transistor Tr is A, the repair transistor Tr may not be turned on when a first voltage is supplied to its gate.

[0095] In this scenario, when a second voltage lower than the first voltage is continuously supplied to the gate of the repair transistor Tr during a predetermined time period, the threshold voltage of the repair transistor Tr shifts from A to B. Here, the predetermined time period can be set differently based on the materials included in the repair transistor Tr or the size of the repair transistor Tr.

[0096] When a first voltage is applied to the gate of the repair transistor Tr, where the threshold voltage of the repair transistor Tr has shifted from A to B, the repair transistor Tr can be turned on.

[0097] The repair transistor Tr with the above characteristics can be a floating gate MOS (FGMOS) used in flash memory, or it can be one of eNVM and embedded non-volatile memory.

[0098] In the following text, reference will be made to Figures 7A to 7DA brief description of how FGMOS, which can be used as a repair transistor Tr, works.

[0099] like Figure 7A As shown, the FGMOS may include a substrate 101 including a semiconductor region 102, a first electrode 103 and a second electrode 104, a gate 106, and an insulating layer 105 disposed between the gate 106 and the semiconductor region 102.

[0100] The insulating layer 105 can be formed by stacking silicon oxide (SiO2), silicon nitride (Si3N4) and SiO2, or by stacking various nitrides and oxides.

[0101] First, such as Figure 7A and Figure 7B As shown, when the FGMOS has a positive (+) threshold voltage A, a voltage lower than the threshold voltage A of the FGMOS can be continuously supplied to the gate 106 of the FGMOS during a period of time, for example, preset to -1V.

[0102] In this case, electrons 107 can discharge in the direction from the insulating layer 105 to the substrate.

[0103] When electrons 107 discharge from the insulating layer 105, a channel can be easily formed in the semiconductor region 102. Therefore, the FGMOS can have a new threshold voltage B that is lower than the previous threshold voltage A.

[0104] Therefore, the FGMOS can be turned on when a voltage lower than the previous threshold voltage A and higher than the new threshold voltage B is provided.

[0105] That is, the FGMOS can be turned on when a voltage higher than the previous threshold voltage A is applied to the gate, and the FGMOS can be turned off when a voltage lower than the previous threshold voltage A is applied to the gate.

[0106] On the other hand, when a voltage lower than the previous threshold voltage A and higher than the new threshold voltage B is provided, the FGMOS with the new threshold voltage B can be turned on.

[0107] In other words, an FGMOS with a new threshold voltage B can be turned on by a voltage lower than that of an FGMOS with a previous threshold voltage A.

[0108] It can continuously maintain the new threshold voltage B.

[0109] Secondly, such as Figure 7C and Figure 7DAs shown, when the FGMOS has a negative (-) threshold voltage A, a voltage with a positive (+) value higher than the threshold voltage A of the FGMOS can be continuously supplied to the gate 106 of the FGMOS during a period of time, for example, pre-set to 1V.

[0110] In this case, electrons 107 can be trapped in the insulating layer 105.

[0111] When electrons 107 are trapped in the insulating layer 105, it may be difficult to form a channel in the semiconductor region 102. Therefore, the FGMOS can have a new threshold voltage B that is higher than the previous threshold voltage A.

[0112] Therefore, the FGMOS can be turned on when a voltage higher than the previous threshold voltage A and lower than the new threshold voltage B is provided.

[0113] That is, when a voltage lower than the previous threshold voltage A is applied to the gate of the FGMOS, the FGMOS with the previous threshold voltage A can be turned on, while when a voltage higher than the previous threshold voltage A is applied to the gate of the FGMOS, the FGMOS can be turned off.

[0114] On the other hand, when a voltage higher than the previous threshold voltage A and lower than the new threshold voltage B is provided, the FGMOS with the new threshold voltage B can be turned on.

[0115] In other words, an FGMOS with a new threshold voltage B can be turned on by a voltage higher than that of an FGMOS with a previous threshold voltage A.

[0116] It can continuously maintain the new threshold voltage B.

[0117] In the following description, a light-emitting display device will be used as an example of this disclosure, wherein the above reference is provided. Figure 7A and Figure 7B The FGMOS with the described characteristics was used as the repair transistor Tr.

[0118] Figure 8 This is an example diagram illustrating a method for changing the threshold voltage of a repair transistor connected to a normal pixel and a defective pixel in a light-emitting display device according to the present disclosure. Figure 9 This indicates the driving during the display period. Figure 8 An example diagram of a method for a light-emitting display device is shown.

[0119] In the following description, it will be described as an example of this disclosure. Figure 6 The first pixel P1 shown is a defective pixel and Figure 6 The second pixel P2 shown is a normal pixel in the luminescent display panel.

[0120] Defective pixels can be detected during the manufacturing process of light-emitting display devices.

[0121] First, an overcurrent can be supplied to the first terminal of the first driving transistor Tdr1 included in the first pixel P1. For example, when the first driving transistor Tdr1 is turned on, an overcurrent can be supplied to the first terminal of the first driving transistor Tdr1. In this case, the overcurrent can be supplied to the first terminal of the first driving transistor Tdr1 through the power supply 500, or the overcurrent can be supplied to the first terminal of the first driving transistor Tdr1 through the repair power supply included in the repair device.

[0122] Therefore, the overcurrent can be supplied to the first fuse FU1 through the first driving transistor Tdr1.

[0123] The resistance of the first auxiliary line 12a of the first fuse FU1 may increase significantly due to overcurrent, and therefore, high heat may occur in the first auxiliary line 12a, and the first auxiliary line 12a may... Figure 5 As shown in (b), it was cut off.

[0124] That is, overcurrent can represent the current that causes the first auxiliary line 12a to be cut off. In Figure 8 In Figure 8 The image shows the first pixel P1 that is cut off by the first auxiliary line 12a through this process.

[0125] With the first auxiliary line 12a disconnected, the nth repair control signal RCSn can be provided to the nth repair control line RCLn, and therefore, the nth repair control transistor Trcn can be turned on.

[0126] The nth repair control signal RCSn can be provided from the gating driver 200, or from the repair device connected to the nth repair control line RCLn.

[0127] Subsequently, a second voltage Vlow (e.g., -1V) can be provided to the sensing line SL, which is lower than the first voltage Vref (e.g., 0V) provided through the sensing line SL during the display period.

[0128] In this situation, the second voltage Vlow can be supplied to the sensing line SL by restoring power or power supply 500.

[0129] During this process, since the nth repair control transistor Trcn is already turned on, the second voltage Vlow can be supplied to the gate of the nth repair transistor Trn through the nth repair control transistor Trcn.

[0130] For example, if the threshold voltage of the repair transistor Tr set between normal pixels is A, the repair transistor Tr may not conduct when the first voltage Vref is provided to the gate of the repair transistor Tr set between normal pixels during the display period.

[0131] In this case, a second voltage Vlow, which is lower than the first voltage, can be supplied to the nth repair transistor Trn, which is connected between the first pixel P1 and the second pixel P2, through the sensing line SL.

[0132] Subsequently, as referenced above Figure 7A and Figure 7B As stated, when a second voltage Vlow lower than the first voltage Vref is continuously supplied to the gate of the nth repair transistor Trn, the threshold voltage of the nth repair transistor Trn can be shifted to B, which is less than A.

[0133] After performing the above process, other manufacturing processes can be performed on the light-emitting display device to complete the light-emitting display device.

[0134] In this case, the threshold voltage of the nth repair transistor Trn can be kept at B.

[0135] When a user uses the light-emitting display device, a first voltage Vref can be provided to the gate of the nth repair transistor Trn, where its threshold voltage has been shifted from A to B, so that the nth repair transistor Trn can be turned on.

[0136] In other words, during the display period of the light-emitting display device, the nth repair control signal RCSn can be provided to the nth repair control line RCLn, thus turning on the nth repair control transistor Trcn.

[0137] In this case, the first voltage Vref can be supplied to the sensing line SL by the power supply 500.

[0138] Because the nth repair control transistor Trcn is turned on during the display period, the first voltage Vref provided by the sensing line SL can be supplied to the gate of the nth repair transistor Trn through the nth repair control transistor Trcn.

[0139] Because the threshold voltage of the nth repair transistor Trn is shifted from A to B, the nth repair transistor Trn can be turned on by the first voltage Vref.

[0140] Finally, as Figure 9 As shown, during the display period, a portion of the current supplied to the second light-emitting device ED2 through the second driving transistor Tdr2 can be supplied to the first light-emitting device ED1 through the nth repair transistor Trn.

[0141] Therefore, the first light-emitting device ED1 and the second light-emitting device ED2 can emit light normally.

[0142] That is, in addition to the second pixel P2, which is a normal pixel, light can also be emitted normally from the first pixel P1, which is a defective pixel.

[0143] In this situation, because a portion of the current supplied to the second light-emitting device ED2 is also supplied to the first light-emitting device ED1, the second light-emitting device ED2 may not emit light with a brightness corresponding to the second light-emitting device ED2. That is, since the light-emitting device ED emits light with a brightness corresponding to the amount of current, it may emit light with a reduced brightness when the amount of current decreases.

[0144] To prevent this problem, the controller 400 can correct the input image data corresponding to the second light-emitting device ED2. For this purpose, the above-mentioned reference can be performed. Figure 8 The described repair process can then be performed, and the position information of the second pixel P2 can be stored in the storage unit 450.

[0145] Therefore, when receiving input image data corresponding to the position information of the second pixel P2, the controller 400 can generate corrected image data so that it can output a brightness greater than that based on the input image data.

[0146] The current corresponding to the corrected image data can be distributed to the second light-emitting device ED2 and the first light-emitting device ED1 through the second driving transistor Tdr2. Therefore, the second light-emitting device ED2 can emit light with a brightness corresponding to the input image data.

[0147] In this case, the corrected image data can be calculated based on the brightness of all pixels, including the first pixel P1 and the second pixel P2.

[0148] Figure 10 and Figure 11 This is an example diagram used to describe the refresh period applied to a light-emitting display device according to this disclosure. In the following description, [the text is incomplete and requires further context to be translated accurately]. Figures 1 to 8 Descriptions that are identical or similar may be omitted or will be given briefly.

[0149] In the process of manufacturing a light-emitting display device, the above-mentioned reference can be performed. Figure 8 The described repair process.

[0150] For example, if the threshold voltage of the nth repair transistor Trn is A as measured in the manufacturing process of the light-emitting display panel, the nth repair transistor Trn may not conduct when a first voltage Vref is supplied to the gate of the nth repair transistor Trn.

[0151] In this case, when a second voltage Vlow, which is lower than the first voltage Vref, is supplied to the gate of the nth repair transistor Trn during a predetermined time period, the threshold voltage of the nth repair transistor Trn can be shifted to B, which is less than A.

[0152] When the light-emitting display device is manufactured and used by the user, the nth repair transistor Trn can be turned on when the first voltage Vref is supplied to the gate of the nth repair transistor Trn, which has a threshold voltage shifted from A to B during the display period.

[0153] That is, during the manufacturing process of the light-emitting display panel, the characteristics have been changed so that the nth repair transistor Trn with threshold voltage B can be turned on during the display period of the displayed image.

[0154] Therefore, as Figure 9 As shown, a portion of the current flowing through the second driving transistor Tdr2 of the second pixel P2 can flow to the second light-emitting device ED2, while another portion can flow to the first light-emitting device ED1.

[0155] Therefore, in addition to the second pixel P2, which is a normal pixel, the first pixel P1, which is a defective pixel, can display the image.

[0156] However, when the light-emitting display device is used continuously, the threshold voltage of the nth repair transistor Trn can be shifted from B to A again, or it can be shifted to a value similar to A.

[0157] In this case, during the display period, the nth repair transistor Trn may not be turned on by the reference voltage Vref (i.e., the first voltage) supplied to the sensing line SL.

[0158] When the nth repair transistor Trn is not turned on, current may not be supplied to the first pixel P1. Therefore, the first pixel P1, which is a defective pixel, may not display an image.

[0159] To address this issue, a refresh operation can be performed on the nth repair transistor Trn after the light-emitting display device is turned on but before the start of the display period, or before the light-emitting display device is turned off after the end of the display period.

[0160] Therefore, the position information of the nth repair transistor Trn, in which the threshold voltage has been shifted from A to B during the manufacturing process of the light-emitting display device, can be stored in the controller 400.

[0161] In this case, all repair control transistors Trc, including the nth repair control transistor Trcn, can be connected to repair stage 202 or stage 201 included in the gating driver 200.

[0162] First, when the refresh period R, which is used to refresh the threshold voltage of at least one repair transistor Tr, arrives, the controller 400 can transmit a control signal that allows all repair control transistors Trc to be turned on in sequence to the gating driver 200.

[0163] Multiple repair control transistors Trc can be connected to at least one repair control line RCL. Therefore, multiple repair control transistors Trc connected to at least one repair control line RCL can be simultaneously turned on by a single repair control signal RCS.

[0164] Therefore, the gating driver 200 can sequentially output repair control signals RCS1 to RCSg / 2 to the repair control line RCL, and can output the nth repair control signal RCSn to the nth repair control line RCLn.

[0165] When the nth repair control signal RCSn is provided to the nth repair control transistor Trcn through the nth repair control line RCLn, the nth repair control transistor Trcn can be turned on.

[0166] In this case, the refresh period R can be set differently. That is, after the refresh period R ends, the display period D of the image can begin in the first pixel P1 and the second pixel P2, and after the display period D ends, the refresh period R can begin.

[0167] For example, such as Figure 11 As shown, when the light-emitting display device is turned on and driven, the refresh period R can begin, and when the refresh period R ends, the display period D can begin.

[0168] Furthermore, after the display period D of the light-emitting display device ends, the refresh period R can begin, and when the refresh period R ends, the light-emitting display device can be turned off.

[0169] In addition, a refresh period R can be set before and after the display period D. That is, a refresh operation can be performed before and after the display period D.

[0170] Subsequently, at the timing of the nth repair control transistor Trcn being turned on, a refresh voltage Vrefresh lower than the first voltage Vref can be provided through the nth sensing line SLn.

[0171] That is, the first voltage Vref can be provided to all sensing lines SL except for the nth sensing line SLn, and the refresh voltage Vrefresh can be provided only to the nth sensing line SLn. However, when a defective pixel other than the first pixel P1 is provided in the light-emitting display panel, the refresh voltage can be provided to the sensing line connected to the other defective pixel.

[0172] In the following text, such as Figure 10 As shown, a light-emitting display panel describing a threshold voltage shift of the nth repair transistor Trn connected only between the nth sensing line SLn and the nth repair control line RCLn is used as an example of this disclosure. However, the refresh operation performed on the nth repair transistor Trn can be similarly applied to another repair transistor Trn included in the light-emitting display panel. That is, when another repair transistor is provided in the light-emitting display panel, in which the threshold voltage has been shifted from A to B during the manufacturing process of the light-emitting display device, the refresh operation performed on the nth repair transistor Trn can be similarly performed on the other repair transistor.

[0173] As described above, the controller 400 can control the power supply 500 such that a first voltage Vref is provided to all sensing lines EL except the nth sensing line SLn, and a refresh voltage Vrefresh is provided only to the nth sensing line SLn. In other words, the controller 400 can control the power supply 500 such that a refresh voltage Vrefresh lower than the first voltage Vref is provided to the nth sensing line SLn connected to the nth repair control transistor Trcn.

[0174] In other words, based on the control of the controller 400, the power supply 500 can provide a first voltage Vref to the sensing line SL except for the nth sensing line SLn, and can provide a refresh voltage Vrefresh only to the nth sensing line SLn.

[0175] In another method, controller 400 may only turn on the switch connected to the nth sensing line SLn among the switches connected between the sensing lines and the refresh power supply unit included in power supply 500, and output refresh voltage Vrefresh. Therefore, refresh voltage Vrefresh can be supplied to the nth sensing line SLn by refresh power supply unit.

[0176] In addition, the refresh voltage Vrefresh can be supplied to the nth sensing line SLn through various methods.

[0177] Finally, through the above processing, when the nth repair control transistor Trcn is turned on, the refresh voltage Vrefresh can be provided to the gate of the nth repair transistor Trn through the nth repair control transistor Trcn.

[0178] The refresh voltage Vrefresh can be the same voltage B used for the shift threshold voltage, or it can be a different voltage.

[0179] When the refresh voltage Vrefresh is supplied to the gate of the nth repair control transistor Trcn, the threshold voltage of the nth repair transistor Trn can be applied again. Figure 7BThe threshold voltage B shown is shifted.

[0180] Therefore, the nth repair transistor Trn can be continuously turned on by the first voltage Vref provided during the display period.

[0181] Therefore, the first pixel P1, which is the defective pixel, can emit light continuously.

[0182] According to this disclosure, defective pixels can be driven normally even without physical repair and soldering. Therefore, the manufacturing cost of the light-emitting display device can be reduced, and the manufacturing process can be simplified.

[0183] In particular, according to this disclosure, defective pixels appearing in light-emitting display panels using silicon substrates can also be driven normally.

[0184] The features, structures, and effects described above are included in at least one embodiment of this disclosure, but are not limited to only one embodiment. Furthermore, the features, structures, and effects described in at least one embodiment of this disclosure can be implemented by those skilled in the art through combinations or modifications of other embodiments. Therefore, anything associated with combinations and modifications should be interpreted as being within the scope of this disclosure.

[0185] It will be apparent to those skilled in the art that various modifications and variations may be made to this disclosure without departing from the spirit or scope thereof. Therefore, this disclosure is intended to cover any modifications and variations that fall within the scope of the appended claims and their equivalents.

[0186] Cross-reference to related applications

[0187] This application claims the benefit of Korean Patent Application No. 10-2021-0186123, filed on December 23, 2021, which is incorporated herein by reference as if fully set forth herein.

Claims

1. A light-emitting display device, the light-emitting display device comprising: The first pixel includes a first light-emitting device and a first pixel driving circuit that drives the first light-emitting device and is connected to a data line. The second pixel includes a second light-emitting device and a second pixel driving circuit that drives the second light-emitting device and is connected to the data line; A repair transistor is connected between the first light-emitting device and the second light-emitting device; as well as A repair control transistor, wherein the repair control transistor is connected to the gate of the repair transistor. The gate of the repair control transistor is connected to the repair control line. The first electrode of the repair control transistor is connected to the gate of the repair transistor, and The second electrode of the repair control transistor is connected to the sensing line, which is connected between the first pixel driving circuit and the second pixel driving circuit.

2. The light-emitting display device according to claim 1, wherein, The first electrode of the repair transistor is connected to the first anode of the first light-emitting device, and the second electrode of the repair transistor is connected to the second anode of the second light-emitting device.

3. The light-emitting display device according to claim 1, wherein, The first fuse is connected between the first light-emitting device and the first driving transistor included in the first pixel driving circuit, and The second fuse is connected between the second light-emitting device and the second driving transistor included in the second pixel driving circuit.

4. The light-emitting display device according to claim 3, wherein, The first fuse includes a first main wire having a first width and a first auxiliary wire disposed between the first main wires and having a second width less than the first width. The second fuse includes a second main line having a third width and a second auxiliary line disposed between the second main lines and having a fourth width less than the third width.

5. The light-emitting display device according to claim 4, wherein, One of the first main lines is connected to the first driving transistor, and the other of the first main lines is connected to the first anode of the first light-emitting device. One of the second main lines is connected to the second driving transistor, and the other of the second main lines is connected to the second anode of the second light-emitting device.

6. The light-emitting display device according to claim 1, wherein, The threshold voltage of the repair transistor varies based on the level of the voltage applied to the gate of the repair transistor.

7. The light-emitting display device according to claim 1, wherein, When the threshold voltage of the repair transistor is a first threshold voltage, the repair transistor does not conduct when a first voltage is supplied to its gate. When a second voltage lower than the first voltage is supplied to the gate of the repair transistor during a predetermined time period, the threshold voltage of the repair transistor shifts to a second threshold voltage lower than the first threshold voltage, and When the first voltage is supplied to the gate of the repair transistor, wherein the threshold voltage has shifted from the first threshold voltage to the second threshold voltage, the repair transistor is turned on.

8. The light-emitting display device according to claim 7, wherein, The location information of the repair transistor is stored in the controller, in which the threshold voltage has been shifted from the first threshold voltage to the second threshold voltage. Disconnect the first light-emitting device from the first pixel driving circuit. The gate of the repair control transistor is connected to a gating driver. When the refresh period for refreshing the repair transistor is reached, the controller sends a control signal to the gating driver to allow the repair control transistor to turn on, and The controller controls the power supply so that a refresh voltage lower than the first voltage is provided to the sensing line connected to the repair control transistor.

9. The light-emitting display device according to claim 8, wherein, When the repair control transistor is turned on, the refresh voltage is provided to the gate of the repair transistor through the repair control transistor.

10. The light-emitting display device according to claim 8, wherein, After the refresh period ends, the display period begins, wherein the first pixel and the second pixel display an image, or The refresh period begins after the display period ends.

11. The light-emitting display device according to claim 1, wherein, The repair control line connected to the gate of the repair control transistor is configured in parallel with the gating line connected to the first pixel and the second pixel.

12. The light-emitting display device according to claim 8, wherein, The controller corrects the input image data corresponding to the second light-emitting device.

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