Display device and its driving method

Abstract

This disclosure relates to a display device and its driving method. The display device includes: a timing controller that receives a dimming value from an external source, determines a dimming band corresponding to the dimming value, and generates and outputs image data and a data driving control signal; a data driver that outputs a data signal corresponding to the image data based on the data driving control signal; and a display panel that displays an image corresponding to the data signal.

Description

[0001] Cross-references to related applications

[0002] This application claims priority to Korean Patent Application No. 10-2021-0138242, filed on October 18, 2021, the entire contents of which are incorporated herein by reference for all purposes. Technical Field

[0003] This disclosure relates to a display device and a driving method thereof. Background Technology

[0004] With the development of the information society, various types of display devices are being developed. Recently, various display devices have been used, such as liquid crystal displays (LCDs), plasma display panels (PDPs), and organic light-emitting diode (OLEDs).

[0005] Among various display devices, organic light-emitting displays (OLEDs) use organic light-emitting devices (OLEDs) to display images. OLEDs are self-emissive and do not require a separate light source, thus reducing the thickness and weight of the display device. Furthermore, OLEDs exhibit high-quality characteristics such as low power consumption, high brightness, and high response time.

[0006] Because display devices are continuously switched on for a period of time to provide information to users, they consume a lot of power. Therefore, research and development are underway to reduce the power consumption of display devices. Summary of the Invention

[0007] The embodiments provide a display device and a driving method thereof that distinguishes / identifies / classifies user dimming values ​​by means of each dimming band and selectively and variably controls the power consumption of the data driver.

[0008] One embodiment is a display device, comprising: a timing controller that receives a dimming value from an external source, determines a dimming band corresponding to the dimming value, and generates and outputs image data and a data drive control signal; a data driver that outputs a data signal corresponding to the image data based on the data drive control signal; and a display panel that displays an image corresponding to the data signal.

[0009] The data drive control signal may include a power management signal and a dimming band signal for controlling the power consumption of the data driver. The data driver may include power management circuitry that limits the power consumption set by the power management signal based on the dimming band signal.

[0010] In response to the dimming band signal, the power management circuit can control the power consumption to the power consumption set by the power management signal, or it can limit the power consumption to the power consumption set by the dimming band signal.

[0011] When the power consumption set by the power management signal is greater than the power consumption corresponding to the dimming band signal, the power management circuit can limit the power consumption to the power consumption corresponding to the dimming band signal in response to the dimming band signal.

[0012] The power management signal can be selected to correspond to power consumption values ​​from the first value to the i-th value (where i is an integer greater than 1). The power management circuit can set the power consumption corresponding to the power management signal to the default value.

[0013] The dimming band signal can be selected to have power consumption limits for each of the first to the i-th values ​​(i is an integer greater than 1).

[0014] When the dimming band signal has a first value, the power management circuit can set the power consumption to the default value.

[0015] When the dimming band signal has a value j (j is an integer in the range from 2 to i) and the power consumption set by the power management signal is greater than the power consumption corresponding to the value j, the power management circuit can limit the power consumption to the power consumption corresponding to the value j.

[0016] Data-driven control signals may also include variable control signals for variably controlling power consumption.

[0017] In response to a variable control signal, the power management circuit can fix the power consumption to the power consumption set by the power management signal, or it can change the power consumption set by the power management signal according to the dimming band signal.

[0018] In response to power consumption, the power management circuit can control the magnitude of the bias current applied to the output buffer of the data driver.

[0019] Another embodiment is a driving method for a display device. The method includes: determining a dimming band corresponding to a dimming value input from an external source to the display device via a timing controller, and outputting image data and a data drive control signal via the timing controller; based on the data drive control signal, outputting a data signal corresponding to the image data via a data driver; and displaying an image corresponding to the data signal via a display panel.

[0020] The drive control signals may include power management signals and dimming band signals for controlling the power consumption of the data driver. The data driver may limit the power consumption set by the power management signals based on the dimming band signals.

[0021] Outputting a data signal via a data driver may include: setting the power consumption set by a power management signal to a default value via a power management circuit; controlling the power consumption to the default value in response to a dimming band signal; outputting a bias current to an output buffer in response to the controlled power consumption; and the output buffer outputting a data signal corresponding to the image data using the bias current.

[0022] Outputting a data signal via a data driver may include: setting the power consumption set by the power management signal to a default value via a power management circuit; limiting the power consumption to the power consumption set by the dimming band signal via the power management circuit in response to the dimming band signal; outputting a bias current to the output buffer in response to the limited power consumption; and the output buffer outputting a data signal corresponding to the image data using the bias current.

[0023] The power management signal can be selected to correspond to power consumption values ​​from the first value to the i-th value (where i is an integer greater than 1). Outputting data signals via the data driver can include setting the power consumption corresponding to the power management signal to a default value.

[0024] The dimming band signal can be selected to have power consumption limits for each of the first to the i-th values ​​(i is an integer greater than 1).

[0025] The method may further include: after setting the power consumption corresponding to the power management signal to a default value, setting the power consumption to a default value when the dimming band signal has a first value.

[0026] The method may further include: after setting the power consumption corresponding to the power management signal to a default value, when the dimming band signal has a j-th value (j is an integer in the range from 2 to i) and the power consumption set by the power management signal is greater than the power consumption corresponding to the j-th value, limiting the power consumption to the power consumption corresponding to the j-th value.

[0027] The data-driven control signal may also include a variable control signal for variably controlling power consumption. The data signal output via the data driver may include: fixing the power consumption to a value set by the power management signal in response to the variable control signal, or changing the power consumption set by the power management signal according to the dimming band signal.

[0028] Changing the power consumption set by the power management signal based on the dimming band signal can include: controlling the magnitude of the bias current applied to the output buffer of the data driver in response to the power consumption. Attached Figure Description

[0029] Figure 1 This is a block diagram illustrating the configuration of a display device according to an embodiment;

[0030] Figure 2 This is a block diagram schematically illustrating the configuration of a display device according to an embodiment;

[0031] Figure 3 This is a block diagram schematically illustrating the configuration of a data driver according to an embodiment;

[0032] Figure 4The data packet structure of the data-driven control signal according to the first embodiment is shown;

[0033] Figure 5 This is a graph showing the power consumption based on the dimming band signal when the power consumption is set to the maximum power or increased power according to the power management signal;

[0034] Figure 6 This is a graph showing the power consumption based on the dimming band signal when the power consumption is set to commercial power according to the power management signal;

[0035] Figure 7 This is a graph showing the power consumption based on the dimming band signal when the power consumption is set to low based on the power management signal;

[0036] Figure 8 This is a graph showing the power consumption based on the dimming band signal when the power consumption is set to minimum or reduced according to the power management signal. Detailed Implementation

[0037] Further details of the embodiments are included in the detailed description and accompanying drawings.

[0038] The features, advantages, and implementation methods of this disclosure will become clearer through the following detailed description of the embodiments and the accompanying drawings. However, this disclosure is not limited to the embodiments disclosed below, but is implemented in various different forms. In the following description, when referring to a part as "connected" to another part, it includes not only the case of a "direct connection" but also the case of an "electrical connection" separated by another element. Furthermore, in the accompanying drawings, parts unrelated to this disclosure will be omitted for clarity. In this patent document, similar reference numerals will be assigned to similar parts.

[0039] Figure 1 This is a block diagram illustrating the configuration of a display device according to an embodiment.

[0040] Reference Figure 1 The display device 1 includes a timing controller 10, a gate driver 20, a gamma voltage generator 30, a data driver 40, a power supply 50, and a display panel 60.

[0041] The timing controller 10 can receive image signals RGB and control signals CS from an external source (e.g., from an external signal source of the display device 1). The image signal RGB may include multiple grayscale data. For example, the control signal CS may include a horizontal synchronization signal, a vertical synchronization signal, and a master clock signal.

[0042] The timing controller 10 can process the image signal RGB and the control signal CS in a manner suitable for the operating conditions of the display panel 60, and then generate and output image data DATA, gamma control signal CONT0, gate drive control signal CONT1, data drive control signal CONT2 and power control signal CONT3.

[0043] Gate driver 20 can be connected to pixels (or sub-pixels) PX of display panel 60 via multiple gate lines GL1 to GLn. Gate driver 20 can generate gate signals based on gate drive control signals CONT1 output from timing controller 10. Gate driver 20 can provide the generated gate signals to pixels PX via multiple gate lines GL1 to GLn.

[0044] The gamma voltage generator 30 generates a gamma voltage group VG based on the gamma control signal CONT0 output from the timing controller 10 and the drive voltages VH and VL provided from the power supply 50. In an embodiment, the gamma voltage generator 30 can generate a gamma reference voltage according to the drive voltages VH and VL, select a gamma voltage corresponding to multiple gray levels from the gamma reference voltage, and then generate the gamma voltage group VG.

[0045] Data driver 40 can be connected to pixels PX of display panel 60 via multiple data lines DL1 to DLm. Data driver 40 can generate a data signal based on image data DATA output from timing controller 10 and data drive control signal CONT2. Data driver 40 can receive a gamma voltage group VG generated by gamma voltage generator 30, select a gamma voltage corresponding to the grayscale of image data DATA from gamma voltage group VG, and then generate a data signal. Data driver 40 can provide the generated data signal to pixels PX via multiple data lines DL1 to DLm. The data signal can be applied to pixels PX in the pixel column selected by the gate signal. For this purpose, data driver 40 can provide the data signal to multiple data lines DL1 to DLm in a manner synchronized with the gate signal.

[0046] Power supply 50 can be connected to the pixels PX of display panel 60 via multiple power lines PL1 and PL2. Power supply 50 can generate driving voltages to be supplied to display panel 60 based on power control signal CONT3. For example, the driving voltages may include a high-level driving voltage VDDEL and a low-level driving voltage VSSEL. Power supply 50 can supply the generated driving voltages VDDEL and VSSEL to the pixels PX via the corresponding power lines PL1 and PL2.

[0047] In this embodiment, the power supply 50 can also generate drive voltages VH and VL for driving the gamma voltage generator 30. The power supply 50 can provide the generated drive voltages VH and VL to the gamma voltage generator 30.

[0048] Multiple pixels PX (or subpixels) are disposed on the display panel 60. For example, the pixels PX may be arranged in a matrix on the display panel 60.

[0049] Each pixel PX can be electrically connected to a corresponding gate line and data line. Pixel PX can emit light with a brightness corresponding to the data signal provided through data lines DL1 to DLm.

[0050] Each pixel PX can display any one of the first to third colors. In one embodiment, each pixel PX can display any one of red, green, and blue. In another embodiment, each pixel PX can display any one of cyan, magenta, and yellow. In various embodiments, the pixel PX can be configured to display any one of four or more colors. For example, each pixel PX can display any one of red, green, blue, and white.

[0051] Figure 1 In this diagram, the gate driver 20 and the data driver 40 are shown as components separate from the display panel 60. However, at least one of the gate driver 20 and the data driver 40 can be implemented using an in-panel method, integrally formed with the display panel 60. For example, the gate driver 20 can be integrally formed with the display panel 60 using a gate-in-panel (GIP) method.

[0052] The timing controller 10, gate driver 20, gamma voltage generator 30, data driver 40, and power supply 50 can each be composed of separate integrated circuits (ICs), or can be configured as ICs that are at least partially integrated among the aforementioned components. For example, the timing controller 10, data driver 40, gamma voltage generator 30, and power supply 50 can be composed of driver chips in the form of integrated circuits (ICs). For example, such driver chips can be implemented in the form of flexible printed circuit boards (FPCBs).

[0053] Figure 2 This is a block diagram schematically illustrating the configuration of a display device according to an embodiment.

[0054] Reference Figure 2 The timing controller 100, gamma voltage generator 300, data driver 400 and power supply 500 of the display device 2 according to the embodiment are schematically shown.

[0055] The timing controller 100 can communicate with external devices, such as a system controller, using a pulse width modulation (PWM) IC or I2C communication. The timing controller 100 can receive image signals RGB and control signals CS from the external device. The image signal RGB may include multiple grayscale data. For example, the control signal CS may include a horizontal synchronization signal, a vertical synchronization signal, and a master clock signal.

[0056] In this embodiment, the timing controller 100 may receive a dimming value DV. The dimming value DV represents the ratio of the maximum or increased display brightness of the display device 2 to the maximum or increased brightness. The higher the dimming value DV, the higher the maximum or increased display brightness. For example, the dimming value DV may be input by the user of the display device 2.

[0057] The timing controller 100 can detect the input dimming value DV in units of at least one frame. The timing controller 100 can modulate the drive signal PWM based on the dimming value DV, and can provide the modulated drive signal PWM as a power control signal CONT3 to the power supply 500.

[0058] Additionally, the timing controller 100 can modulate the input image signal RGB based on the detected dimming value DV, and can provide the modulated image data DATA to the data driver 400. Furthermore, the timing controller 100 can generate a data drive control signal CONT2 based on the dimming value DV, and can provide the data drive control signal CONT2 to the data driver 400.

[0059] The data drive control signal CONT2 provided to the data driver 400 may include a power management signal for controlling the power consumption of the data driver 400, a variable control signal for variably controlling power consumption, and a dimming band signal for limiting power consumption based on the dimming value DV. Here, the dimming band is a standard used to control the power consumption (i.e., current consumption) set to a default value. For example, first to i-th dimming bands (i is an integer greater than 1) can be defined or selected.

[0060] This information can be provided to the data driver 400 in units of at least one frame via power management signals. The specific data packet structure of the power management signals provided from the timing controller 100 to the data driver 400 will be described in detail below.

[0061] The gamma voltage generator 300 generates a gamma voltage group VG based on the gamma control signal CONT0 output from the timing controller 100 and the drive voltages VH and VL provided by the power supply 500.

[0062] In this embodiment, the gamma voltage generator 300 can output multiple gamma voltages corresponding to the dimming value DV received from the dimming controller 110 as a gamma voltage group VG. For example, the gamma voltage generator 300 can select a reference voltage group corresponding to the dimming value DV from preset reference voltage groups corresponding to the first dimming band to the i-th dimming band, and can generate the gamma voltage group VG by interpolation between the reference voltage groups.

[0063] In this embodiment, a larger dimming value DV results in a larger maximum or increased gamma voltage. A smaller dimming value DV results in a smaller maximum or increased gamma voltage. Therefore, as the dimming value DV increases, the data voltage increases, thereby increasing the power consumption of the data driver 400.

[0064] The data driver 400 can receive image data DATA and data drive control signal CONT2 output from the timing controller 100. The data driver 400 can communicate with the timing controller 100 via, for example, an embedded clock point-to-point interface (EPI) protocol.

[0065] The data driver 400 can receive a gamma voltage group VG from the gamma voltage generator 300, select a voltage corresponding to the grayscale of the image data DATA from the gamma voltage group VG, and generate a data signal.

[0066] In one embodiment, the data driver 400 may include a power management circuit for controlling the power consumption in the output buffer based on a drive control signal CONT2 output from the timing controller 100. The power management circuit can control the magnitude of the current applied to the output buffer based on a power management signal included in the drive control signal CONT2. In another embodiment, the power management circuit can change the current applied to the output buffer based on a variable control signal and a dimming band signal included in the power management signal. Because the current consumed by the output buffer is variably controlled, the power consumed by the data driver 400 can also be variably controlled. The method for controlling the power consumption of the data driver 400 will be described in more detail below.

[0067] The power supply 500 can generate drive voltages VH and VL for driving the gamma voltage generator 300 based on the drive signal PWM received from the timing controller 100. The power supply 500 can provide the drive voltages VH and VL to the gamma voltage generator 300.

[0068] Figure 3 This is a block diagram schematically illustrating the configuration of a data driver according to an embodiment.

[0069] Reference Figure 3According to the embodiment, the data driver 400 may include a register unit or circuit 410, a latch unit or circuit 420, a digital-to-analog converter 430, an output buffer 440, and a power management circuit PWRC 450.

[0070] Register unit 410 generates a sampling signal by using the data drive control signal CONT2 received from timing controller 100, and provides the generated sampling signal to latch unit 420.

[0071] The latch unit 420 latches the image data DATA received from the timing controller 100 and outputs the image data DATA to the digital-to-analog converter 430 in response to the sampling signal received from the register unit 410.

[0072] The digital-to-analog converter (DAC) 430 converts the image data DATA received from the latch unit 420 into a gamma-compensated voltage and generates a data voltage.

[0073] The output buffer 440 outputs the data voltage from the digital-to-analog converter 430 to the data line DL according to the source output enable signal included in the data drive control signal CONT2.

[0074] Multiple output buffers 440 can be provided. In this embodiment, the output buffers 440 are respectively connected to data lines disposed in a portion of the display panel 60. Through the multiple output buffers 440, data signals can be applied to data lines DL1 to DLm disposed in the entire area of ​​the display panel 60.

[0075] The power management circuit 450 can apply a bias current Ibias to the output buffer 440 in response to the drive control signal CONT2 transmitted from the timing controller 100. The output buffer 440 can amplify the data voltage based on the bias current Ibias transmitted from the power management circuit 450, and can output the amplified data voltage to the data line DL. Here, the power consumption of the output buffer and the power consumption of the data driver 400 can be controlled according to the magnitude of the current output from the output buffer 440.

[0076] Figure 4 The data packet structure of the data-driven control signal according to the first embodiment is shown.

[0077] Reference Figure 4 The timing controller 100 sequentially transmits the clock training mode, control data, and RGB data to the data driver 400.

[0078] The clock training mode is a clock signal used to synchronize the operating timing of the timing controller 100 and the data driver 400, and it can be a square wave signal.

[0079] The control data is a data-driven control signal and may include information indicating the start of the control data, information indicating the start position of the RGB data, information indicating the rise time and pulse width of the source output enable signal, etc. Furthermore, the control data may include source control data and gate control data, and may also include information for controlling various functions that can be implemented by the data driver 400.

[0080] For example, the control data may include power management signals for controlling the power consumption of the data driver 400. Additionally, the control data may also include variable control signals and dimming band signals.

[0081] The control data can indicate the above information by using a low or high level. In an embodiment, the bits of the first control signal CTR1 constituting the control data can correspond to the information shown in Table 1.

[0082] Table 1

[0083]

[0084] In the first control signal CTR1 in Table 1, the eighth and ninth bits are power management signals PWRC1 and PWRC2 used to control the power consumption of the data driver 400. In the embodiment, Figure 3 The power management circuit shown may include a first power management circuit and a second power management circuit. The power consumption of the data driver 400 can be controlled according to the power management signals PWRC1 and PWRC2 applied to the first and second power management circuits. In this embodiment, the power management signals PWRC1 and PWRC2 define or select a power management mode corresponding to a first to a fourth value represented by two bits of data.

[0085] The power consumption based on the value of the 2-bit data can be defined or selected as shown in Table 2.

[0086] Table 2

[0087] L L Ultra-low power L H low power H L Normal power H H Maximum power

[0088] Based on the voltage levels of power management signals PWRC1 and PWRC2, a low-level voltage or a high-level voltage can be applied to the first power management circuit and the second power management circuit. When a low-level voltage is applied to the first power management circuit and the second power management circuit (fourth value, "LL"), the data driver 400 is controlled to consume minimum or reduced power (fourth mode). When a high-level voltage is applied to the first power management circuit and the second power management circuit (first value, "HH"), the data driver 400 is controlled to consume maximum or increased power (first mode). When a low-level voltage is applied to the first power management circuit and a high-level voltage is applied to the second power management circuit (third value, "LH"), the data driver 400 is controlled to consume low power (third mode). When a high-level voltage is applied to the first power management circuit and a low-level voltage is applied to the second power management circuit (second value, "HL"), the data driver 400 is controlled to consume full power (second mode).

[0089] The eleventh signal is the variable control signal PWRC Con, which indicates the variable control mode for power consumption. In an embodiment, the variable control signal PWRC Con can indicate either the manual control mode or the automatic control mode of the power management circuit PWRC.

[0090] In manual control mode, the power management circuit PWRC does not change the power consumption of the data driver 400 and controls the power consumption to a fixed value. That is, the power management circuit PWRC outputs a bias current Ibias with a fixed value to the output buffer 440.

[0091] In automatic control mode, the power management circuit PWRC variably controls the power consumption of the data driver 400 in response to the dimming band. That is, the power management circuit PWRC variably outputs a bias current Ibias to the output buffer 440 in response to the dimming band.

[0092] The variable control mode based on the value of 1 bit data can be defined or selected as shown in Table 3.

[0093] Table 3

[0094]

[0095]

[0096] Reserved bits exist after the first power management signal PWRC Con of the first control signal CTR1. The timing controller 100 can indicate whether the dimming band and the corresponding power limit are enabled by using at least two reserved bits (Band1 and Band2). The number of bits used by the timing controller 100 can be determined based on the predetermined or selected number i of dimming bands. Specifically, the timing controller 100 can use i... 1 / 2 The units digit indicates i predefined dimming bands respectively.

[0097] The following describes an embodiment in which the timing controller 100 indicates four predefined dimming bands and whether or not the power corresponding to the dimming bands is limited by using the twelfth and thirteenth bits, respectively. The following embodiments can be appropriately modified and extended based on the value of i.

[0098] The dimming band based on the value of the 2-bit data can be defined or selected as shown in Table 4.

[0099] Table 4

[0100] H H Band1->Default PWRC H L Band2 -> Below PWRC L H Band3 -> Below PWRC L L Band4 -> Below PWRC

[0101] In Table 4, "HH" indicates the first dimming band, "HL" indicates the second dimming band, "LH" indicates the third dimming band, and "LL" indicates the fourth dimming band. In an embodiment, the dimming value DV corresponding to the first dimming band can be greater than the dimming value DV corresponding to the second dimming band. The dimming value DV corresponding to the second dimming band can be greater than the dimming value DV corresponding to the third dimming band. The dimming value DV corresponding to the third dimming band can be greater than the dimming value DV corresponding to the fourth dimming band.

[0102] In response to the indicated dimming band, power consumption can be controlled as set by the power management signal, or it can be limited to a level lower than the power consumption set by the power management signal. For example, in the first dimming band, power consumption is controlled to the default value set by the power management signal. In the second to fourth dimming bands, power consumption is limited to the value set by the dimming band signal.

[0103] Therefore, the timing controller 100 adds the dimming band signal to the data drive control signal and transmits it to the data driver 400. Thus, the power limiting information based on the dimming band can be transmitted to the data driver 400 without altering the interface of the existing signals.

[0104] However, the embodiments are not limited thereto. In various other embodiments, the dimming band signal can be transmitted from the timing controller 100 to the data driver 400 via data packets defined separately from (i.e., different from) those shown in Table 1. The format of the data packets is not particularly limited.

[0105] When the dimming band is set to the first value, "HH", the power management circuit PWRC can control the power consumption of the data driver 400 according to the default mode set by the power management signals PWRC1 and PWRC2.

[0106] When the dimming band is set to the second value, "HL", the power management circuit PWRC limits the power consumption of the data driver 400 to the power consumption corresponding to the second value of the power management signals PWRC1 and PWRC2. In other words, when the default mode set by the power management signals PWRC1 and PWRC2 is higher than the power consumption corresponding to the second value, i.e., commercial power, the power management circuit PWRC limits the power consumption of the data driver 400 to commercial power.

[0107] When the dimming band is set to the third value, "LH", the power management circuit PWRC limits the power consumption of the data driver 400 to the power consumption corresponding to the third value of the power management signals PWRC1 and PWRC2. In other words, when the default mode set by the power management signals PWRC1 and PWRC2 is higher than the power consumption corresponding to the third value (i.e., low power consumption), the power management circuit PWRC limits the power consumption of the data driver 400 to commercial power.

[0108] When the dimming band is set to the fourth value, "LL", the power management circuit PWRC limits the power consumption of the data driver 400 to the power consumption corresponding to the fourth value of the power management signals PWRC1 and PWRC2. That is, when the default mode set by the power management signals PWRC1 and PWRC2 is higher than the power consumption corresponding to the fourth value (i.e., the minimum or reduced power), the power management circuit PWRC limits the power consumption of the data driver 400 to the minimum or reduced power.

[0109] Therefore, the display device 2 variably controls the power consumption of the data driver 400 according to the dimming value DV set by the power management signals PWRC1 and PWRC2, thereby reducing power consumption.

[0110] RGB data can include multiple grayscale data corresponding to the image to be displayed.

[0111] Figure 5 This is a graph showing the power consumption based on the dimming band signal when the power consumption is set to the maximum or increased power according to the power management signal.

[0112] exist Figure 5 In this embodiment, power management signals PWRC1 and PWRC2 are set to "HH". The power management circuit PWRC, in response to power management signals PWRC1 and PWRC2, controls the default power consumption of the data driver 400 to a first mode, i.e., to the maximum or increased power.

[0113] During the control data transmission period CP of the first frame F1, the dimming band is set to "HH". Power consumption in the first dimming band is controlled according to the default values ​​set by power management signals PWRC1 and PWRC2. Therefore, during the first frame F1, the power consumption of the data driver 400 is controlled to the maximum or increased power.

[0114] During the control data transmission period CP of the second frame F2, the dimming band is set to "HL". Power consumption in the second dimming band is limited to commercial power corresponding to the "HL" values ​​of power management signals PWRC1 and PWRC2. Since the power consumption according to the default value is greater than the power limited by the dimming band, the power consumption of the data driver 400 is controlled to commercial power during the second frame F2.

[0115] During the control data transmission period CP of the third frame F3, the dimming band is set to "LH". The power consumption in the third dimming band is limited to a low power corresponding to the "LH" value of the power management signals PWRC1 and PWRC2. Since the power consumption according to the default value is greater than the power limited by the dimming band, the power consumption of the data driver 400 is controlled to a low power during the third frame F3.

[0116] During the control data transmission period CP of the fourth frame F4, the dimming band is set to "LL". Power consumption in the fourth dimming band is limited to the minimum or reduced power corresponding to the "LL" values ​​of power management signals PWRC1 and PWRC2. Since the power consumption according to the default value is greater than the power limited by the dimming band, the power consumption of the data driver 400 is controlled to the minimum or reduced power during the fourth frame F4.

[0117] Figure 6 This is a graph showing the power consumption based on the dimming band signal when the power consumption based on the power management signal is set to commercial power.

[0118] exist Figure 6 In this embodiment, power management signals PWRC1 and PWRC2 are set to "HL". The power management circuit PWRC, in response to power management signals PWRC1 and PWRC2, controls the default power consumption of the data driver 400 to the second mode, i.e., to commercial power.

[0119] During the control data transmission period CP of the first frame F1, the dimming band is set to "HH". Power consumption in the first dimming band is controlled according to the default values ​​set by power management signals PWRC1 and PWRC2. Therefore, during the first frame F1, the power consumption of the data driver 400 is controlled to commercial power.

[0120] During the control data transmission period CP of the second frame F2, the dimming band is set to "HL". Power consumption in the second dimming band is limited to commercial power corresponding to the "HL" values ​​of power management signals PWRC1 and PWRC2. Since the power consumption according to the default value is no greater than the power limited by the dimming band, the power consumption of the data driver 400 is controlled to commercial power during the second frame F2.

[0121] During the control data transmission period CP of the third frame F3, the dimming band is set to "LH". The power consumption in the third dimming band is limited to a low power corresponding to the "LH" value of the power management signals PWRC1 and PWRC2. Since the power consumption according to the default value is greater than the power limited by the dimming band, the power consumption of the data driver 400 is controlled to a low power during the third frame F3.

[0122] During the control data transmission period CP of the fourth frame F4, the dimming band is set to "LL". Power consumption in the fourth dimming band is limited to the minimum or reduced power corresponding to the "LL" values ​​of power management signals PWRC1 and PWRC2. Since the power consumption according to the default value is greater than the power limited by the dimming band, the power consumption of the data driver 400 is controlled to the minimum or reduced power during the fourth frame F4.

[0123] Figure 7 This is a graph showing the power consumption based on the dimming band signal when the power consumption is set to low based on the power management signal.

[0124] exist Figure 7 In this embodiment, power management signals PWRC1 and PWRC2 are set to "LH". The power management circuit PWRC, in response to power management signals PWRC1 and PWRC2, controls the default power consumption of the data driver 400 to the third mode, i.e., low power consumption.

[0125] During the control data transmission period CP of the first frame F1, the dimming band is set to "HH". Power consumption in the first dimming band is controlled according to the default values ​​set by power management signals PWRC1 and PWRC2. Therefore, during the first frame F1, the power consumption of the data driver 400 is controlled to be low.

[0126] During the control data transmission period CP of the second frame F2, the dimming band is set to "HL". Power consumption in the second dimming band is limited to the commercial power corresponding to the "HL" values ​​of power management signals PWRC1 and PWRC2. Since the power consumption according to the default value is no greater than the power limited by the dimming band, the power consumption of the data driver 400 is controlled to low power during the second frame F2.

[0127] During the control data transmission period CP of the third frame F3, the dimming band is set to "LH". The power consumption in the third dimming band is limited to a low power corresponding to the "LH" values ​​of the power management signals PWRC1 and PWRC2. Since the power consumption according to the default value is not greater than the power limited by the dimming band, the power consumption of the data driver 400 is controlled to a low power during the third frame F3.

[0128] During the control data transmission period CP of the fourth frame F4, the dimming band is set to "LL". Power consumption in the fourth dimming band is limited to the minimum or reduced power corresponding to the "LL" values ​​of power management signals PWRC1 and PWRC2. Since the power consumption according to the default value is greater than the power limited by the dimming band, the power consumption of the data driver 400 is controlled to the minimum or reduced power during the fourth frame F4.

[0129] Figure 8 This is a graph showing the power consumption based on the dimming band signal when the power consumption is set to the minimum or reduced power according to the power management signal.

[0130] exist Figure 8 In this embodiment, power management signals PWRC1 and PWRC2 are set to "LL". The power management circuit PWRC, in response to power management signals PWRC1 and PWRC2, controls the default power consumption of the data driver 400 to the fourth mode, i.e., to the minimum or reduced power.

[0131] During the control data transmission period CP of the first frame F1, the dimming band is set to "HH". Power consumption in the first dimming band is controlled according to the default values ​​set by power management signals PWRC1 and PWRC2. Therefore, during the first frame F1, the power consumption of the data driver 400 is controlled to a minimum or reduced level.

[0132] During the control data transmission period CP of the second frame F2, the dimming band is set to "HL". The power consumption in the second dimming band is limited to the commercial power corresponding to the "HL" values ​​of the power management signals PWRC1 and PWRC2. Since the power consumption according to the default value is not greater than the power limited by the dimming band, the power consumption of the data driver 400 is controlled to a minimum or reduced power during the second frame F2.

[0133] During the control data transmission period CP of the third frame F3, the dimming band is set to "LH". The power consumption in the third dimming band is limited to a low power corresponding to the "LH" value of the power management signals PWRC1 and PWRC2. Since the power consumption according to the default value is not greater than the power limited by the dimming band, the power consumption of the data driver 400 is controlled to a minimum or reduced power during the third frame F3.

[0134] During the control data transmission period CP of the fourth frame F4, the dimming band is set to "LL". Power consumption in the fourth dimming band is limited to the minimum or reduced power corresponding to the "LL" values ​​of power management signals PWRC1 and PWRC2. Since the power consumption according to the default value is no greater than the power limited by the dimming band, the power consumption of the data driver 400 is controlled to the minimum or reduced power during the fourth frame F4.

[0135] According to the display device and driving method described in the embodiments, the power consumption of the display device can be reduced by changing the power consumption of the data driver.

[0136] Those skilled in the art will understand that the embodiments may be implemented in other specific forms without departing from the spirit or essential characteristics of the embodiments. Therefore, the above embodiments and advantages are merely examples and should not be construed as limiting this disclosure. Those skilled in the art will understand that these embodiments may be implemented in other specific forms without departing from the spirit and essential characteristics of this disclosure. Therefore, the embodiments disclosed in this disclosure are merely examples and should not be construed as limiting this disclosure. All modifications, variations, and modifications within the scope of this disclosure should be understood as being included within the scope of this disclosure.

[0137] Further embodiments can be provided by combining the various embodiments described above. All U.S. patents, U.S. patent application publications, U.S. patent applications, foreign patents, foreign patent applications and non-patent publications mentioned in and / or listed in the application data sheets are incorporated herein by reference in their entirety. If necessary, aspects of the embodiments may be modified to incorporate concepts from various patents, applications and publications to provide further embodiments.

[0138] These and other changes can be made to the embodiments based on the above detailed description. Generally, the terminology used in the following claims should not be construed as limiting the claims to the specific embodiments disclosed in the specification and claims, but should be interpreted to include all possible embodiments enjoyed by those claims and the full scope of their equivalents. Therefore, the claims are not limited to this disclosure.

Claims

1. A display device, comprising: The timing controller receives dimming values ​​from outside the display device, determines the dimming band corresponding to the dimming values, and generates and outputs image data and data drive control signals. A data driver outputs a data signal corresponding to the image data based on the data driving control signal; as well as The display panel shows an image corresponding to the data signal. The data drive control signal includes a power management signal and a dimming band signal for controlling the power consumption of the data driver. The data driver includes a power management circuit that limits the power consumption set by the power management signal based on the dimming band signal. The power management circuit, in response to the limited power consumption, controls the magnitude of the bias current applied to the output buffer of the data driver, and The output buffer uses the bias current to output a data signal corresponding to the image data.

2. The display device according to claim 1, wherein, In response to the dimming band signal, the power management circuit controls the power consumption to the power consumption set by the power management signal, or limits the power consumption to the power consumption set by the dimming band signal.

3. The display device according to claim 2, wherein, In response to the dimming band signal, when the power consumption set by the power management signal is greater than the power consumption corresponding to the dimming band signal, the power management circuit limits the power consumption to the power consumption corresponding to the dimming band signal.

4. The display device according to claim 1, wherein, The power management signal selection corresponds to power consumption values ​​from the first value to the i-th value, where i is an integer greater than 1, and The power management circuit sets the power consumption corresponding to the power management signal to the default value.

5. The display device according to claim 4, wherein, The dimming band signal selection corresponds to whether or not the power consumption is limited for the first value to the i-th value.

6. The display device according to claim 5, wherein, When the dimming band signal has a first value, the power management circuit sets the power consumption to the default value.

7. The display device according to claim 6, wherein, When the dimming band signal has a j-th value and the power consumption set by the power management signal is greater than the power consumption corresponding to the j-th value, the power management circuit limits the power consumption to the power consumption corresponding to the j-th value, where j is an integer in the range from 2 to i.

8. The display device according to claim 1, wherein, The data-driven control signal also includes a variable control signal for variably controlling power consumption, and In response to the variable control signal, the power management circuit fixes the power consumption to the power consumption set by the power management signal, or changes the power consumption set by the power management signal according to the dimming band signal.

9. A driving method for a display device, the method comprising: The timing controller determines the dimming band corresponding to the dimming value input from the outside of the display device, and outputs image data and data drive control signals through the timing controller. Based on the data-driven control signal, the data driver outputs a data signal corresponding to the image data; as well as The image corresponding to the data signal is displayed on the display panel. The data drive control signal includes a power management signal and a dimming band signal for controlling the power consumption of the data driver. The data driver limits the power consumption set by the power management signal based on the dimming band signal. The data signal output through the data driver includes: The power management circuit of the data driver sets the power consumption based on the dimming band signal, which is set by the power management signal. In response to the set power consumption, the magnitude of the bias current applied to the output buffer of the data driver is controlled; and The output buffer uses the bias current to output the data signal corresponding to the image data.

10. The method according to claim 9, wherein, The data signal output via the data driver also includes: Before setting the power consumption based on the dimming band signal, the power consumption set by the power management signal is set to the default value by the power management circuit.

11. The method according to claim 9, wherein, The power consumption setting based on the dimming band signal includes: The power consumption set by the power management signal is set to a default value through the power management circuit; and In response to the dimming band signal, the power management circuit limits the power consumption to the power consumption set by the dimming band signal.

12. The method according to claim 9, wherein, The power management signal selection corresponds to power consumption values ​​from the first value to the i-th value, where i is an integer greater than 1, and Specifically, outputting the data signal through the data driver includes setting the power consumption corresponding to the power management signal to a default value.

13. The method according to claim 12, wherein, The dimming band signal selection corresponds to whether or not the power consumption is limited for the first value to the i-th value.

14. The method of claim 13, further comprising setting the power consumption corresponding to the power management signal to the default value, and then setting the power consumption to the default value when the dimming band signal has a first value.

15. The method of claim 14, further comprising, after setting the power consumption corresponding to the power management signal to the default value of the power consumption, when the dimming band signal has a j-th value and the power consumption set by the power management signal is greater than the power consumption corresponding to the j-th value, limiting the power consumption to the power consumption corresponding to the j-th value, wherein, j is an integer in the range from 2 to i.

16. The method according to claim 9, wherein, The data-driven control signal also includes a variable control signal for variably controlling power consumption, and Specifically, outputting the data signal through the data driver includes, in response to the variable control signal, fixing the power consumption to the power consumption set by the power management signal, or changing the power consumption set by the power management signal according to the dimming band signal.

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