Display device

Abstract

A display device according to an exemplary embodiment includes a display panel, a plurality of source plates, a power control board, and a control board, the display panel including a plurality of pixels; the plurality of source plates are connected to the display panel; the power control board is connected to the source plates and configured to supply a power voltage to the plurality of pixels; and the control board is configured to control the output of the voltage supplied to the source plates according to a control signal transmitted by the power control board.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to and the benefit of Korean Patent Application No. 10-2018-0134592 filed in the Korean Intellectual Property Office (KIPO) on November 5, 2018, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present disclosure relates to a display device. Background Art

[0004] Typically, a display device includes a display panel having a plurality of pixels, and a power supply voltage transmitted from a power supply control board through a power supply cable is applied to the pixels. As the resolution of the display device increases and the display device becomes larger, the load of the display device increases and the current flowing through the power supply cable increases. In order to reduce the load, the power supply voltage may be supplied to the pixels of the display panel through a plurality of power supply cables. When a portion of the power supply cables for supplying the power supply voltage is not normally connected (e.g., abnormally connected, not fastened, or incorrectly fastened), the brightness may be reduced or abnormal heat may be generated in a portion of the display panel near the unfastened / incorrectly fastened power supply cable.

[0005] In order to supply data signals to pixels, the data driver includes a gamma voltage generator and a driving circuit. A driving voltage transmitted from a control board through a power cable is applied to the driving circuit and the gamma voltage generator. When the gamma voltage generated by the gamma voltage generator is transmitted to the driving circuit before the driving voltage is normally applied to the driving circuit, the driving circuit may not operate normally.

[0006] The above information disclosed in this Background section is only for enhancement of understanding of the background and therefore it may contain information that does not form the prior art that is already known in this country by a person of ordinary skill in the art. Summary of the invention

[0007] Exemplary embodiments of the present invention have been made in an effort to provide a display device for sensing a connection state of a power cable and controlling a power voltage.Exemplary embodiments of the present invention provide a display device for controlling a driving voltage to normally apply the driving voltage to a driving circuit.

[0008] An exemplary embodiment of the present invention provides a display device, which includes a display panel, a plurality of source plates, a power control board, and a control board, the display panel having a plurality of pixels; the plurality of source plates are connected to the display panel; the power control board is connected to the plurality of source plates and is configured to supply a power supply voltage to the plurality of pixels; and the control board is configured to control the output of the voltage supplied to the source plates according to a control signal transmitted by the power control board.

[0009] The power control board may be connected to the plurality of source boards via a plurality of first cables.

[0010] When at least one of the plurality of first cables is abnormally connected to the at least one source plate, the power control board may output a control signal to prevent a voltage from being output to the at least one source plate.

[0011] The power control board is configured to output a control signal by using the value of the power voltage applied to the plurality of source boards.

[0012] The power control board may include multiple first connectors, the multiple source boards may respectively include second connectors, and the first ends of the multiple first cables may be connected to the first connectors, and the second ends of the multiple first cables may be connected to the second connectors included in the corresponding source boards.

[0013] Multiple first cables may respectively include power supply voltage lines, and the power control board may include a sensing resistor and a comparison resistor. When the first cables are normally fastened to the second connector, the first end of the sensing resistor is connected to the power supply voltage line, and when the first cables are abnormally fastened to the second connector, the first end may not be connected to the power supply voltage line, and the comparison resistor is connected to the second end of the sensing resistor, and the control signal may correspond to a voltage value divided by the sensing resistor and the comparison resistor.

[0014] A voltage value divided by the sensing resistor and the comparison resistor may be higher when the plurality of first cables are normally fastened to the second connector than when the plurality of first cables are abnormally fastened to the second connector.

[0015] The first cables may respectively include power supply voltage lines, the source plates may respectively include sensing resistors, when the first cables are normally fastened to the second connector, the first ends of the sensing resistors are connected to the power supply voltage lines, and when the first cables are abnormally fastened to the second connector, the first ends are not connected to the power supply voltage lines, the power control board may include a comparison resistor, when the first cable is normally fastened to the second connector, the comparison resistor is connected to the second end of the sensing resistor, and when the first cable is abnormally fastened to the second connector, the comparison resistor is not connected to the second end of the sensing resistor, and the control signal may correspond to a voltage value divided by the sensing resistor and the comparison resistor.

[0016] The control board may be connected to the source board via a plurality of second cables.

[0017] The control board may include a voltage generator, a gamma voltage generator, and a switch, the voltage generator being used to generate a driving voltage of a driving circuit for generating a data signal applied to at least one of the pixels; the gamma voltage generator being used to receive the driving voltage and generate a plurality of gamma voltages applied to the driving circuit; and the switch being used to transmit the driving voltage to the gamma voltage generator in correspondence with the control signal.

[0018] The driving voltage and the plurality of gamma voltages may be transmitted to the plurality of source plates through the plurality of second cables.

[0019] The switch may transmit the driving voltage to the gamma voltage generator according to the intensity of the driving voltage and the control signal transmitted to the second cable.

[0020] The driving circuit may be mounted on a driving circuit package for connecting the display panel and the source plate.

[0021] The power supply voltage can be transmitted to the pixels through the wiring of the driver circuit package.

[0022] The control board and the power control board may be connected through a third cable, and when a control signal transmitted to the control board through the third cable exceeds a predetermined level, a voltage supplied to the source board may be output.

[0023] Another embodiment of the present invention provides a display device, including a display panel, a power control board and a control board, the display panel including a plurality of pixels; the power control board is configured to transmit a power voltage to the pixels via a plurality of cables and output a voltage corresponding to the voltage value transmitted via the cables as a control signal; and the control board is configured to generate a plurality of gamma voltages applied to the driving circuit when a driving voltage for operating a driving circuit configured to generate a data signal transmitted to the pixels and a voltage corresponding to the sum of the driving voltage and the control signal exceed a predetermined level.

[0024] The voltage value of the control signal may be changed according to the tightening state of the cable.

[0025] The power control board may include an AND gate circuit for generating a control signal by performing an AND operation on a voltage corresponding to a voltage value transmitted through the cable.

[0026] The control board may include a gamma generator, a switch, and an AND gate circuit, the gamma generator generating a gamma voltage; the switch transmitting a driving voltage to the gamma voltage generator; and the AND gate circuit outputting a signal for controlling the switch by performing an AND operation on a voltage of the driving voltage and a control signal.

[0027] Another embodiment of the present invention provides a display device, including a display panel, multiple source plates, multiple drive circuit packages, a power control board and a control board, the display panel including multiple pixels; multiple source plates are connected to the display panel; multiple drive circuit packages each include a drive circuit for connecting the display panel and the corresponding source plate and generating a data signal applied to the pixel, and transmitting a power supply voltage to the pixel; the power control board is connected to the multiple source plates through multiple first cables and transmits the power supply voltage; and the control board is connected to the source plates through the first cables, generates a drive voltage and multiple gamma voltages for operating the drive circuit, transmits the drive voltage and multiple gamma voltages, and controls the gamma voltage corresponding to the levels of the power supply voltage and the drive voltage.

[0028] According to the exemplary embodiments, it is possible to prevent the display device from being burned due to an overcurrent that may be generated when the power cable is abnormally fastened.

[0029] According to example embodiments, a driving circuit of a data driver may operate normally.

[0030] According to the exemplary embodiments, circuits mounted on a display device may be protected at low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Example embodiments will now be described more fully below with reference to the accompanying drawings; however, they may be implemented in different forms and should not be construed as limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the example embodiments to those skilled in the art.

[0032] Figure 1 A block diagram of a display device according to an exemplary embodiment is shown.

[0033] Figure 2 Shows Figure 1 The control board, power control board and data driver of the display device shown in FIG.

[0034] Figure 3 According to an exemplary embodiment, Figure 2 Circuit diagram of the control board and power control board.

[0035] Figure 4 According to another exemplary embodiment, Figure 2 Circuit diagram of the control board and power control board.

[0036] Figure 5 A graph showing a normally applied driving voltage when a power supply voltage of a display device according to an exemplary embodiment is normally applied.

[0037] Figure 6 A graph showing that application of a driving voltage is stopped when a power supply voltage of a display device according to an exemplary embodiment is abnormally applied. DETAILED DESCRIPTION

[0038] Hereinafter, example embodiments will be described in more detail with reference to the accompanying drawings, wherein the same reference numerals always represent the same elements. However, the present invention can be implemented in various forms and should not be construed as being limited only to the embodiments shown herein. On the contrary, these embodiments are provided as examples so that this disclosure will be thorough and complete, and the aspects and features of the present invention will be fully conveyed to those skilled in the art. Accordingly, processes, elements and techniques that are not necessary for a person of ordinary skill in the art to fully understand the aspects and features of the present invention may not be described. Unless otherwise stated, the same reference numerals indicate the same elements throughout the drawings and written descriptions, and therefore their descriptions will not be repeated. In the accompanying drawings, for clarity, the relative sizes of elements, layers and regions may be enlarged.

[0039] It should be understood that although the terms "first", "second", "third", etc. may be used herein to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the spirit and scope of the present invention, the first element, component, region, layer or part discussed below may be referred to as a second element, component, region, layer or part.

[0040] Spatially relative terms such as "beneath", "below", "lower", "under", "above", "upper", etc. may be used herein for convenience of explanation to describe the relationship between one element or feature and another element or feature as shown in the figure. It should be understood that in addition to the orientation shown in the figure, the spatially relative terms are intended to also include different orientations of the device in use or operation. For example, if the device in the figure is turned over, the elements described as being "below", "beneath" or "under" other elements or features will then be oriented to be "above" other elements or features. Therefore, the example term "below" may include both the orientations of above and below. The device can be oriented in other ways (e.g., rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein should be interpreted accordingly.

[0041] It should be understood that when an element or layer is referred to as being "on," "connected to," or "coupled to" another element or layer, the element or layer may be directly on, directly connected to, or coupled to the other element or layer, or intervening elements or layers may be present. In addition, it should also be understood that when an element or layer is referred to as being "between" two elements or layers, the element or layer may be the only element or layer between the two elements or layers, or one or more intervening elements or layers may be present.

[0042] The terms used herein are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. Unless otherwise clearly indicated in the context, the singular forms "a" and "an" as used herein are also intended to include plural forms. It should also be understood that when the terms "comprise", "comprising", "include" and "including" are used in this specification, the existence of the stated features, wholes, steps, operations, elements and / or parts is indicated, but the existence or addition of one or more other features, wholes, steps, operations, elements, parts and / or their clusters is not excluded. As used herein, the term "and / or" includes any and all combinations of one or more of the related listed items. The expression (such as "at least one") after a column of elements modifies the entire column of elements, rather than the individual elements in the column.

[0043] As used herein, the terms "substantially," "about," and the like are used as terms of approximation rather than terms of degree, and are intended to take into account the inherent deviations of measurements or calculations that one of ordinary skill in the art will recognize. In addition, when describing embodiments of the present invention, the use of "may" means "one or more embodiments of the present invention." As used herein, the terms "use," "using," and "used" may be considered synonymous with the terms "utilize," "utilizing," and "utilized," respectively. Moreover, the term "exemplary" is intended to mean an example or illustration.

[0044] The display device or multiple display devices according to the embodiments of the present invention described herein and / or any other related devices or components such as display panels, source plates, gate plates, power control boards and control boards including multiple pixels can be implemented using any appropriate hardware, firmware (e.g., application specific integrated circuits), software or a combination of software, firmware and hardware. For example, the various components of these devices can be formed on an integrated circuit (IC) chip or on a separate IC chip. In addition, the various components of these devices can be implemented on a flexible printed circuit film, a tape carrier package (TCP), a printed circuit board (PCB) or formed on a substrate. In addition, the various components of these devices can be processes or threads that run on one or more processors in one or more computing devices to execute computer program instructions and interact with other system components to perform the various functions described herein.

[0045] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. It should also be understood that unless explicitly defined as such herein, terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and / or specification, and should not be interpreted in an idealized or overly formal sense.

[0046] Figure 1 A block diagram of a display device according to an exemplary embodiment is shown.

[0047] Reference Figure 1 The display device 1000 includes a display panel 100 , source plates 110 a , 110 b , 110 c and 110 d , a gate plate 130 , a power control board 200 and a control board 300 .

[0048] The display panel 100 includes a plurality of pixels. In an exemplary embodiment, the display device 1000 is an organic light emitting device, and each pixel may include an organic light emitting diode. The pixel may receive a data signal from a source driving circuit 122 (D-IC), and may receive a scan signal from a gate driving circuit 142 (GATE-IC). In addition, the pixel may receive an emission control signal from an additionally provided driving circuit.

[0049] The pixel may receive a first power voltage applied to an anode of the organic light emitting diode and a second power voltage applied to a cathode of the organic light emitting diode from the power control board 200 .

[0050] The power control board 200 may be connected to the source plates 110a, 110b, 110c, and 110d through the first cable CBL1. Here, the first cable CBL1 may be fastened to the first connector CNT1 of the source plates 110a, 110b, 110c, and 110d. The first cable CBL1 may include a cable for providing a power supply voltage, a ground voltage, and a control signal. In addition, the power control board 200 uses a method of fastening one of the first cables CBL1 to the third connector CNT3, and it may be connected to the gate plate 130.

[0051] In an exemplary embodiment, the power control board 200 may include a first voltage generator for supplying a power voltage to the pixels and may control a driving voltage supplied to the driving circuit based on a voltage provided through the first cable CBL1. The power control board 200 may be a printed circuit board (PCB).

[0052] For example, the power control board 200 may generate a control signal by using a voltage transmitted through a wiring for transmitting a power voltage. The power control board 200 may transmit a control signal for indicating whether the first cables CBL1 are normally connected or abnormally connected to the control board 300. When at least one of the first cables CBL1 is abnormally connected, the power control board 200 may transmit a control signal to the control board 300 so that the data signal may not be applied to the pixel to prevent burning caused by abnormal heating.

[0053] The control board 300 may be connected to the source plates 110a, 110b, 110c and 110d via a second cable CBL2. Here, the second cable CBL2 may be fastened to the second connector CNT2 of the source plates 110a, 110b, 110c and 110d. The second cable CBL2 may include a cable for supplying a driving voltage and a control signal (source control signal, gate control signal and clock signal). In addition, the control board 300 uses a method of fastening one of the second cables CBL2 to a fourth connector CNT4, and it may be directly connected to the gate plate 130.

[0054] In an exemplary embodiment, the control board 300 may generate a plurality of signals for driving the display device 1000. The control board 300 may include a timing controller for controlling the driving circuit D-IC and the GATE-IC. The control board 300 may generate a driving voltage for driving the display device 1000. The control board 300 may be a PCB.

[0055] The source plates 110a, 110b, 110c, and 110d may be connected to the display panel 100. The source plates 110a, 110b, 110c, and 110d may be a printed board assembly (PBA) on which a module for driving a PCB (e.g., a driving memory) is mounted. In an exemplary embodiment, the source plates 110a, 110b, 110c, and 110d may be connected to the display panel 100 through a driving circuit package 120. For example, a source driving circuit 122 (D-IC) may connect the display panel 100 with the source plates 110a, 110b, 110c, and 110d according to a chip on film (COF) or a tape carrier package (TCP).

[0056] The gate plate 130 may be connected to the display panel 100. The gate plate 130 may be a PBA on which a module for driving a PCB is mounted. In an exemplary embodiment, the gate plate 130 may be connected to the display panel 100 through a driving circuit package 140. For example, a gate driving circuit 142 (GATE-IC) may connect the display panel 100 and the gate plate 130 according to a chip on film (COF) scheme or a tape carrier package (TCP) scheme.

[0057] Figure 2 Shows Figure 1 The control board, power control board and data driver of the display device shown in FIG.

[0058] The source driving circuit 122 is mounted in the driving circuit package 120, and the driving circuit package 120 is connected to the source plate 110a. The driving circuit package 120 is connected to the source plate 110a and is configured to receive a signal and a voltage.

[0059] The driving voltage AVDD and the gamma voltages GMA0 to GMAn are transmitted from the control board 300 through the second cable CBL2 fastened to the second connector CNT2 of the source plate 110a. The driving voltage AVDD and the gamma voltages GMA0 to GMAn are transmitted from the second connector CNT2 to the source driving circuit 122 through the wiring W11 of the source plate 110a. That is, the source driving circuit 122 may receive the driving voltage AVDD and the gamma voltages GMA0 to GMAn through the source plate 110a. The source driving circuit 122 may generate a data voltage corresponding to grayscale data (e.g., grayscale) by using the gamma voltages GMA0 to GMAn. Here, the gamma voltages GMA0 to GMAn are provided by the gamma voltage generator 330 (PG-IC), and the data voltages may be data signals corresponding to specific pixels.

[0060] The power supply voltage ELVDD is transmitted from the power supply control board 200 through the first cable CBL1a fastened to the first connector CNT1 of the source board 110a. The signal and voltage transmitted to the first connector CNT1 are transmitted to the driving circuit package 120 through the wiring W12. The power supply voltage ELVDD can then be transmitted to the display panel 100 through the wiring W1 of the driving circuit package 120.

[0061] The power control board 200 includes a first voltage generator 210, and the first voltage generator 210 is connected to the connectors CNT11, CNT12, CNT13, and CNT14. The first voltage generator 210 transmits the power voltage ELVDD to the connectors CNT11, CNT12, CNT13, and CNT14, and receives the ground voltage GND from the connectors CNT11, CNT12, CNT13, and CNT14. The corresponding first cables CBL1a, CBL1b, CBL1c, and CBL1d may be fastened to the corresponding connectors CNT11, CNT12, CNT13, and CNT14 of the power control board 200.

[0062] The power control board 200 may be connected to the control board 300, and may transmit and receive signals. For example, the connector CNT15 of the power control board 200 is connected to the connector CNT22 of the control board 300 through the third cable CBL3. When at least one of the first cables CBL1a to CBL1d is abnormally connected, the power control board 200 may transmit a control signal to the control board 300 so that the driving voltage AVDD may not be transmitted to the gamma voltage generator 330. In addition, when the first cable CBL1 is normally connected, the power control board 200 may transmit a control signal to the control board 300 so that the driving voltage AVDD may be transmitted to the gamma voltage generator 330.

[0063] The control board 300 includes a second voltage generator 310, a switch 320, and a gamma voltage generator 330. Figure 2 , the control board 300 is shown to include constituent elements for outputting data signals, and the control board 300 may further include constituent elements for driving the gate driving circuit 142 (GATE-IC), but is not limited thereto.

[0064] The second voltage generator 310 may generate a driving voltage AVDD and may output it to the connector CNT21 and the gamma voltage generator 330. For example, the second voltage generator 310 may include a DC-DC converter that generates the driving voltage AVDD using an input voltage. The DC-DC converter may generate a high potential driving voltage AVDD by boosting the input voltage. To this end, the DC-DC converter may, for example, include a boost circuit.

[0065] The switch 320 may be turned on or off corresponding to a control signal transmitted from the power control board 200 , and it may transmit the driving voltage GAVDD to the gamma voltage generator 330 .

[0066] The gamma voltage generator 330 generates input gamma voltages GMA0 to GMAn. For example, the gamma voltage generator 330 may determine a reference gamma voltage level by using a driving voltage GAVDD based on the gamma characteristics of the pixel, and may generate a reference gamma voltage based on the reference gamma voltage level. The gamma voltage generator 330 may generate the gamma voltages GMA0 to GMAn by dividing the reference gamma voltage. The gamma voltage generator 330 may output the gamma voltages GMA0 to GMAn to the connector CNT21.

[0067] As described above, the control board 300 outputs the driving voltage AVDD and the gamma voltages GMA0 to GMAn according to the control signal output by the power control board 200, and now will refer to Figure 3 and Figure 4 Describe it in detail.

[0068] Figure 3 According to an exemplary embodiment, Figure 2 The circuit diagram of the control board and power control board, and Figure 4 According to another exemplary embodiment, Figure 2 Circuit diagram of the control board and power control board.

[0069] Reference Figure 3 The power control board 200 may further include sensing resistors R01 to R04 , comparison resistors Ra and Rb, and a first voltage adding unit 220 .

[0070] Equivalent resistors on one side of the source plates 110a, 110b, 110c, and 110d observed through the first cables CBL1a, CBL1b, CBL1c, and CBL1d on the first voltage generator 210 may be shown as resistors RCN1, RCN2, RCN3, and RCN4.

[0071] A first end of the sensing resistor R01 is connected to a wiring for supplying a power supply voltage ELVDD from a first connector CNT1 from a source plate 110a through a first cable CBL1a. The sensing resistor R01 is connected to a node N01 on one side of the resistor RCN1 and the first connector CNT1. In addition, a second end of the sensing resistor R01 is connected to a comparison resistor Ra at a node N1.

[0072] The first ends of the sensing resistors R02, R03, and R04 are connected to a wiring for supplying a power supply voltage ELVDD from a connector of the source plates 110b, 110c, and 110d. The second ends of the sensing resistors R01 and R02 are connected to a comparison resistor Ra at a node N1, and the second ends of the sensing resistors R03 and R04 are connected to a comparison resistor Rb at a node N2. In this case, it will be assumed that the resistances of the sensing resistors R01 to R04 are the same, and the resistances of the comparison resistors Ra and Rb are the same.

[0073] When the first cables CBL1a, CBL1b, CBL1c and CBL1d are normally tightened, the voltages at the nodes N1 and N2 are the highest (case A). For example, when the first cables CBL1a, CBL1b, CBL1c and CBL1d are normally tightened, the voltage at the node N1 can be calculated according to equation 1:

[0074] Formula 1

[0075]

[0076] When at least one of the first cables CBL1a, CBL1b, CBL1c, and CBL1d is not normally fastened (e.g., abnormally fastened), the voltages at the nodes N1 and N2 are lower than the voltages during case A (e.g., during case B). For example, when the fastening of the first cable CBL1a is abnormal, the comparison resistor Ra is coupled in series to the sensing resistor R02, and the power supply voltage ELVDD is divided, so the voltage at the node N1 can be calculated according to Formula 2:

[0077] Formula 2

[0078]

[0079] The voltage at the node N1 and the voltage at the node N2 are input to the first voltage adding unit 220. The first voltage adding unit 220 may be configured with an analog switch, a voltage adder, an AND gate circuit, or a multiplexer, and may be configured to output a voltage corresponding to the sum of two voltages (e.g., the voltages at the node N1 and the node N2) as the control signal FB1. The power control board 200 and the control board 300 may be connected via a cable (e.g., Figure 2 The second cables CBL2) or wirings of the power control board 200 are connected to each other, so the control board 300 receives the control signal FB1 from the power control board 200.

[0080] The above example has been described by assuming that there are four source plates, but the number of source plates is not limited, and the configuration of the internal circuit of the power control board 200 may be modified according to the number of source plates. For example, when there are two source plates 110a and 110b, the voltage at the node N1 is output as the control signal FB1, and the sensing resistors R01 and R04 and the comparison resistor Rb may not be required in the power control board 200.

[0081] The control board 300 may further include a second voltage adding unit 314 and a comparator 316. Resistors RF1 and RF2 are coupled in series to the output end of the second voltage generator 310. A voltage FB2 between the resistors RF1 and RF2 changes according to the strength of the driving voltage AVDD transmitted to the connector CNT21. The voltage FB2 is input to the second voltage adding unit 314. In addition, a control signal FB1 provided by the power control board 200 is input to the second voltage adding unit 314. The second voltage adding unit 314 may be configured with an analog switch, a voltage adder, an AND gate circuit, or a multiplexer, and may output a voltage corresponding to the sum of two voltages as a control signal FB3. The second voltage adding unit 314 outputs a control signal FB3 by using the control signal FB1 transmitted from the power control board 200 (i.e., output according to whether the first cables CBL1a to CBL1d are normally tightened) and the driving voltage AVDD transmitted from the second voltage generator 310 to the connector CNT21. The driving voltage AVDD gradually increases by boosting, and thus the voltage value of the control signal FB3 also increases.

[0082] The comparator 316 compares the control signal FB3 with the reference voltage VREF to output an enable signal EN for turning on the switch 320. For example, when the control signal FB3 exceeds the reference voltage VREF, the comparator 316 outputs the enable signal EN. That is, when the voltage level of the control signal transmitted to the control board 300 through the third cable CBL3 exceeds a predetermined level and the driving voltage AVDD reaches a predetermined level, the comparator 316 turns on the switch 320.

[0083] When the value of the control signal FB3 is equal to or less than the reference voltage VREF, the comparator 316 keeps the switch 320 in the off state. For example, when the first cables CBL1a, CBL1b, CBL1c, and CBL1d are abnormally fastened to the connector or the driving voltage AVDD is not boosted above a predetermined level, the comparator 316 keeps the switch 320 in the off state so that the driving voltage GAVDD may not be applied to the gamma voltage generator 330.

[0084] The driving voltage GAVDD is applied to the gamma voltage generator 330 through the turned-on switch 320 , and the gamma voltage generator 330 generates the gamma voltage GMA and supplies it to the connector CNT21 .

[0085] According to an exemplary embodiment, when the driving voltage AVDD is applied to the source driving circuit (eg, Figure 2 After that, the driving voltage GAVDD is applied to the gamma voltage generator 330, so that the source driving circuit (eg, Figure 2 In addition, when the first cables CBL1a, CBL1b, CBL1c, and CBL1d are abnormally fastened to the connector, the driving voltage GAVDD is not applied to the gamma voltage generator 330, thereby preventing the display device 1000 from being damaged by the source driving circuit (e.g., Figure 2 The source driver circuit 122) is driven by overcurrent and is burned.

[0086] Reference Figure 4 , Figure 4 The constituent elements shown in FIG. 1 except for the positions where the sensing resistors R11 to R14 are arranged are the same as Figure 3 The constituent elements shown in are the same, so they will not be described.

[0087] Equivalent resistors on one side of the source plates 110a, 110b, 110c, and 110d viewed from the first voltage generator 210 through the first cables CBL1a, CBL1b, CBL1c, and CBL1d may be shown as resistors RCN1, RCN2, RCN3, and RCN4.

[0088] Sensing resistors R11, R12, R13, and R14 are formed on the source plates 110a, 110b, 110c, and 110d. The sensing resistor R11 is connected to the resistor RCN1 at the node N11 on one side of the first connector CNT1. The first end of the sensing resistor R11 is connected to the wiring for supplying the power supply voltage ELVDD on the first connector CNT1 of the source plate 110a. In addition, the second end of the sensing resistor R11 is connected to the comparison resistor Ra at the node N11 of the power control board 200 through the first cable CBL1a.

[0089] In a similar manner, the first ends of the sensing resistors R12, R13, and R14 are connected to wiring for supplying the power supply voltage ELVDD of the connectors on the source plates 110b, 110c, and 110d, respectively. The second ends of the sensing resistors R11 and R12 are connected to the comparison resistor Ra at the node N1, and the second ends of the sensing resistors R13 and R14 are connected to the comparison resistor Rb at the node N2. In this case, it is assumed that the resistances of the comparison resistors Ra and Rb are the same.

[0090] According to an exemplary embodiment, when the driving voltage AVDD is applied to the source driving circuit (eg, Figure 2 After that, the driving voltage GAVDD is applied to the gamma voltage generator 330, so that the source driving circuit (eg, Figure 2 In addition, when the first cables CBL1a, CBL1b, CBL1c, and CBL1d are abnormally fastened to the connector, the driving voltage GAVDD is not applied to the gamma voltage generator 330, thereby preventing the display device 1000 from being damaged by the source driving circuit (e.g., Figure 2 The source driver circuit 122) is driven by overcurrent and is burned.

[0091] Now refer to Figure 5 and Figure 6 A driving voltage controlled when a power supply voltage of a display device is normally applied and when a display voltage is abnormally applied is described.

[0092] Figure 5 A graph showing a normally applied driving voltage when a power supply voltage of a display device according to an exemplary embodiment is normally applied, and Figure 6 A graph showing that application of a driving voltage is stopped when a power supply voltage of a display device according to an exemplary embodiment is abnormally applied.

[0093] like Figure 3 and Figure 4 As shown in FIG. 1 , currents I1 to I4 caused by the power supply voltage ELVDD flow through the first cables CBL1 a , CBL1 b , CBL1 c , and CBL1 d .

[0094] Reference Figure 5 , the power supply voltage ELVDD starts to gradually increase at t00. Accordingly, the currents I1 to I4 flowing through the first cables CBL1a, CBL1b, CBL1c, and CBL1d increase.

[0095] In addition, at t00, the driving voltage AVDD output by the second voltage generator 310 begins to gradually increase. Accordingly, the driving voltage AVDD supplied to the source driving circuit (eg, Figure 2The driving voltage AVDD of the source driving circuit 122) increases.

[0096] At t01, the power voltage ELVDD reaches a predetermined level and is normally transmitted to the connector through the first cables CBL1a, CBL1b, CBL1c, and CBL1d, and when the driving voltage AVDD reaches a predetermined level, the switch 320 is turned on. The driving voltage GAVDD is applied to the gamma voltage generator 330 through the turned-on switch 320. The driving voltage GAVDD may have the same level as the driving voltage AVDD.

[0097] For example, when the first cables CBL1a, CBL1b, CBL1c, and CBL1d are normally fastened to the connector to which the power voltage ELVDD is normally applied, and the driving voltage AVDD greater than a predetermined level is applied, the driving voltage GAVDD is applied to the gamma voltage generator 330, and thus the source driving circuit (e.g., Figure 2 The source driving circuit 122) can operate normally.

[0098] Reference Figure 6 In some cases, one of the cables may be abnormally tightened. In this example, the first cable CBL1a is abnormally tightened.

[0099] At t10, the power supply voltage ELVDD gradually increases. Accordingly, the currents I2 to I4 flowing through the first cables CBL1b, CBL1c, and CBL1d increase. However, the first cable CBL1a is abnormally tightened, so the current I1 does not increase.

[0100] In addition, at t10, the driving voltage AVDD output by the second voltage generator 310 begins to gradually increase. Figure 2 The driving voltage AVDD of the source driving circuit 122) increases.

[0101] At t11, the power voltage ELVDD reaches a predetermined level and is normally transmitted to the connector through the first cables CBL1b, CBL1c, and CBL1d, and when the power voltage ELVDD is not normally (e.g., abnormally) transmitted to the first connector CNT1 through the cables, the switch 320 is maintained in the off state even when the driving voltage AVDD reaches a predetermined level. The driving voltage GAVDD is not applied to the gamma voltage generator 330. Therefore, when the first cable CBL1a is abnormally fastened to the connector, the driving voltage GAVDD is not applied to the gamma voltage generator 330, thereby preventing the display device 1000 from being damaged by the source driving circuit (e.g., Figure 2 The source driver circuit 122) is driven by overcurrent and is burned.

[0102] While the invention has been described in conjunction with what are presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but on the contrary is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims and their equivalents.

Claims

1. A display device, comprising: A display panel, the display panel comprising a plurality of pixels; A plurality of source plates, the plurality of source plates are connected to the display panel, and the plurality of source plates are connected to corresponding plurality of driving circuits; a power control board connected to the plurality of source plates through a plurality of first cables and configured to supply a power voltage to the plurality of pixels through the plurality of first cables; as well as a control board connected to the plurality of source plates through a plurality of second cables and configured to provide a driving voltage and gamma voltages of a plurality of gamma voltage levels to the plurality of source plates through the plurality of second cables, The control board is configured to control the output of the gamma voltage supplied to the driving circuit of the source board according to the control signal transmitted by the power control board, and When at least one of the plurality of first cables is abnormally connected to at least one of the plurality of source plates, the power control board outputs the control signal to prevent the gamma voltage from being output to at least one of the plurality of source plates.

2. The display device according to claim 1, wherein: The power control board is configured to output the control signal by using a value of the at least one power voltage applied to the plurality of pixels.

3. The display device according to claim 1, wherein: The power control board includes a plurality of first connectors, The plurality of source plates respectively include a second connector, and First ends of the plurality of first cables are connected to the first connector, and second ends of the plurality of first cables are connected to the second connector of corresponding source plates among the plurality of source plates.

4. The display device according to claim 3, wherein: The plurality of first cables respectively include a power supply voltage line, The power control board comprises: a sensing resistor, a first end of which is connected to the power voltage line when the plurality of first cables are normally fastened to the second connector, and the first end of which is not connected to the power voltage line when the plurality of first cables are abnormally fastened to the second connector, and a comparison resistor connected to the second end of the sensing resistor, and The control signal corresponds to a voltage value divided by the sensing resistor and the comparison resistor.

5. The display device according to claim 4, wherein: The voltage value divided by the sensing resistor and the comparison resistor is higher when the plurality of first cables are normally fastened to the second connector than when the plurality of first cables are abnormally fastened to the second connector.

6. The display device according to claim 3, wherein: The first cables respectively include power supply voltage lines, The plurality of source plates respectively include a sensing resistor, a first end of the sensing resistor being connected to the power voltage line when the first cables are respectively normally fastened to the second connector, and the first end being not connected to the power voltage line when the first cables are respectively abnormally fastened to the second connector, the power control board includes a comparison resistor connected to the second end of the sensing resistor when the first cable is normally fastened to the second connector, and not connected to the second end of the sensing resistor when the first cable is abnormally fastened to the second connector, and The control signal corresponds to a voltage value divided by the sensing resistor and the comparison resistor.

7. The display device according to claim 1, wherein: The control board and the power control board are connected via a third cable, and When the control signal transmitted to the control board through the third cable exceeds a predetermined level, the gamma voltage supplied to the source board is output.

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