Display device and method of operating a display device

Abstract

The disclosure relates to a display apparatus and a method of operating a display apparatus. The display apparatus includes a display panel, a data line, a constant voltage line, a feedback line, and a display driver. The display panel includes a pixel. The data line transmits a data voltage to the pixel. The constant voltage line transmits a constant voltage to the pixel. The feedback line is coupled to the constant voltage line. The display driver is configured to sense an amount of change in the constant voltage through the feedback line, generate compensated image data by compensating image data according to the sensed amount of change in the constant voltage, and provide a data voltage corresponding to the compensated image data to the pixel.

Description

TECHNICAL FIELD

[0001] Exemplary embodiments of the inventive concept relate to a display apparatus, and more particularly, to a display apparatus capable of reducing or eliminating horizontal crosstalk and a method of operating the display apparatus. BACKGROUND

[0002] Display apparatuses are used to convey information to users. Electronic apparatuses including displays include televisions, mobile phones, and computers. The displays of electronic apparatuses typically include a plurality of light-emitting pixels. These pixels are illuminated in a particular pattern to display a message or an image. In some apparatuses, the pixels of the display apparatus receive a plurality of voltages including a data voltage, a constant voltage, and a power voltage, and emit light based on the received voltages.

[0003] However, the constant voltage can be changed by coupling between a data line that transmits the data voltage and a constant voltage line that transmits the constant voltage. For example, the constant voltage can change when the data voltage of the pixels of the current row is changed or during a transition from the data voltage of the pixels of the previous row. If the constant voltage is changed, the pixels can not emit the desired brightness, and horizontal crosstalk can occur. Therefore, there is a need in the art for a system and method that compensates for changes in the constant voltage of the pixels. SUMMARY

[0004] Some exemplary embodiments provide a display apparatus capable of reducing or eliminating horizontal crosstalk and a method of operating the display apparatus.

[0005] According to an exemplary embodiment, a display apparatus is provided, including a display panel including pixels, a data line for transmitting a data voltage to the pixels, a constant voltage line for transmitting a constant voltage to the pixels, and a feedback line coupled to the constant voltage line, and a display driver configured to sense an amount of change in the constant voltage through the feedback line, generate compensated image data by compensating for image data according to the sensed amount of change in the constant voltage, and provide a data voltage corresponding to the compensated image data to the pixels.

[0006] In an exemplary embodiment, the display driver can sense, through the feedback line, the amount of change in the constant voltage caused by coupling between the data line and the constant voltage line when the data voltage is changed. In an exemplary embodiment, the constant voltage can be an initialization voltage, and the constant voltage line can be an initialization voltage line.

[0007] In an exemplary embodiment, the display driver can sense an amount of change in the constant voltage caused when a data voltage of pixels of an Nth row is changed from a data voltage of pixels of an N-1th row through the feedback line, can generate compensated image data of the pixels of the N+1th row by compensating for the image data of the pixels of the N+1th row according to the sensed amount of change in the constant voltage, and can provide a data voltage corresponding to the compensated image data to the pixels of the N+1th row, where N is an integer greater than 1.

[0008] In an exemplary embodiment, the display driver includes a sensing circuit configured to generate a change amount sensing value by sensing an amount of change in the constant voltage through the feedback line, a data compensator configured to determine a compensation value corresponding to the change amount sensing value and generate compensated image data by adding the compensation value to the image data, and a data driver configured to receive the compensated image data from the data compensator and provide a data voltage corresponding to the compensated image data to the pixels.

[0009] In an exemplary embodiment, the feedback line can be formed around a display area of the display panel in which the pixels are disposed, and can be coupled to the constant voltage line at an edge portion of the display area. In an exemplary embodiment, the display panel can include a first feedback line coupled to the constant voltage line at a first edge portion of the display area of the display panel away from the display driver and a second feedback line coupled to the constant voltage line at a second edge portion of the display area close to the display driver as the feedback line.

[0010] In an exemplary embodiment, the display driver can compensate for the image data of the pixels disposed in a first half of the display area based on the amount of change in the constant voltage sensed through the first feedback line, and can compensate for the image data of the pixels disposed in a second half of the display area based on the amount of change in the constant voltage sensed through the second feedback line.

[0011] In an exemplary embodiment, the display area of the display panel can be divided into a plurality of display blocks, and the display panel can include a plurality of feedback lines respectively coupled to the constant voltage line at the plurality of display blocks as the feedback line. In an exemplary embodiment, the display driver can compensate for the image data of the pixels disposed at one of the plurality of display blocks based on the amount of change in the constant voltage sensed through one of the plurality of feedback lines corresponding to the one of the plurality of display blocks.

[0012] In an exemplary embodiment, the display driver can include a compensation map configured to store a plurality of compensation values according to a plurality of change amount sensing values and a plurality of gray scales. The display driver can compensate for the image data by using the compensation map.

[0013] In an exemplary embodiment, a display area of a display panel can be divided into a plurality of display blocks. A display driver can include a plurality of compensation maps for the plurality of display blocks, respectively. The display driver can compensate image data of a pixel disposed at one of the plurality of display blocks by using one of the plurality of compensation maps corresponding to the one of the plurality of display blocks.

[0014] In an exemplary embodiment, a display area of a display panel can be divided into a plurality of display blocks. A display driver can include a first compensation map for an uppermost display block of the plurality of display blocks and a second compensation map for a lowermost display block of the plurality of display blocks. The display driver can compensate image data of a pixel disposed at one of the plurality of display blocks by interpolating a first compensation value extracted from the first compensation map and a second compensation value extracted from the second compensation map.

[0015] In an exemplary embodiment, the constant voltage can be a power voltage, and the constant voltage line can be a power voltage line. In an exemplary embodiment, the display driver can sense an amount of change in the constant voltage through the feedback line in a previous frame period, and when image data in a current frame period is substantially the same as image data in the previous frame period, the image data in the current frame period can be compensated according to the amount of change in the constant voltage sensed in the previous frame period.

[0016] According to an exemplary embodiment, a method of operating a display apparatus is provided. In the method, an amount of change in a constant voltage of a constant voltage line is sensed through a feedback line, compensated image data is generated by compensating image data according to the sensed amount of change in the constant voltage, and a data voltage corresponding to the compensated image data is provided to a pixel.

[0017] In an exemplary embodiment, an amount of change in a constant voltage caused by coupling between a data line and a constant voltage line when a data voltage of the data line changes can be sensed through a feedback line. In an exemplary embodiment, the constant voltage can be an initialization voltage, and the constant voltage line can be an initialization voltage line.

[0018] In an exemplary embodiment, an amount of change in a constant voltage caused when a data voltage of an Nth row of pixels changes from a data voltage of an (N-1)th row of pixels can be sensed through a feedback line, where N is an integer greater than 1. Compensated image data of an (N+1)th row of pixels can be generated by compensating image data of the (N+1)th row of pixels according to the sensed amount of change in the constant voltage. In an exemplary embodiment, the constant voltage can be a power voltage, and the constant voltage line can be a power voltage line.

[0019] As described above, in the display apparatus and the method of operating the display apparatus according to exemplary embodiments, the amount of change in the constant voltage (e.g., an initialization voltage, a power supply voltage, etc.) caused by coupling between the data line and the constant voltage line can be sensed through the feedback line, and the image data can be compensated according to the sensed amount of change in the constant voltage. Thus, horizontal crosstalk caused by coupling between the data line and the constant voltage line can be reduced or eliminated. BRIEF DESCRIPTION OF DRAWINGS

[0020] Exemplary embodiments will become more fully understood from the detailed description and accompanying drawings, in which:

[0021] Figure 1 is a block diagram illustrating a display apparatus according to exemplary embodiments.

[0022] Figure 2 is a circuit diagram illustrating an example of each pixel included in a display apparatus according to exemplary embodiments.

[0023] Figure 3 is a graph illustrating an example of image data of a display panel.

[0024] Figure 4 is a timing chart for describing an example in which an initialization voltage is changed when image data of Figure 3 is provided in a conventional display apparatus.

[0025] Figure 5 is a timing chart for describing an example of the operation of a display apparatus according to exemplary embodiments.

[0026] Figure 6 is a graph illustrating an example of a compensation map included in a display apparatus according to exemplary embodiments.

[0027] Figure 7 is a flowchart illustrating a method of operating a display apparatus according to exemplary embodiments.

[0028] Figure 8 is a block diagram illustrating a display apparatus according to exemplary embodiments.

[0029] Figure 9 is a block diagram illustrating a display apparatus according to exemplary embodiments.

[0030] Figure 10 is a block diagram illustrating a display apparatus according to exemplary embodiments.

[0031] Figure 11 is a block diagram illustrating a display apparatus according to exemplary embodiments.

[0032] Figure 12 is a block diagram illustrating a display apparatus according to exemplary embodiments.

[0033] Figure 13 is a circuit diagram illustrating an example of each pixel included in a display apparatus according to an exemplary embodiment.

[0034] Figure 14 is a timing diagram for describing an example of an operation of a display apparatus according to an exemplary embodiment.

[0035] Figure 15 is a block diagram illustrating an electronic apparatus including a display apparatus according to an exemplary embodiment. DETAILED DESCRIPTION

[0036] The present disclosure relates generally to a display apparatus, and more particularly, to a display apparatus having a feedback line for sensing an amount of change in a constant voltage caused by coupling between a data line and a constant voltage line. Then, image data can be compensated based on the sensed change in the constant voltage.

[0037] In some cases, pixels of a display apparatus are powered by a plurality of voltages including a data voltage, a constant voltage, and a power voltage, and can emit light based on the received voltages. However, the constant voltage can be changed by coupling between a data line and a constant voltage line for transmitting the constant voltage. When the constant voltage is changed, the pixels can not illuminate with a desired brightness, resulting in incorrect luminance and possible horizontal crosstalk (i.e., a defect caused by interference between pixels).

[0038] Embodiments of the present disclosure include a display panel having a plurality of pixels, a data line, a constant voltage line, a feedback line, and a display driver. The data line transmits a data voltage to the pixels. The constant voltage line transmits a constant voltage to the pixels. The feedback line is coupled to the constant voltage line. The display driver is configured to sense an amount of change in the constant voltage through the feedback line, generate compensated image data by compensating for the image data according to the sensed amount of change in the constant voltage, and provide a data voltage corresponding to the compensated image data to the pixels.

[0039] Hereinafter, embodiments of the inventive concept will be explained in detail with reference to the accompanying drawings.

[0040] Figure 1 is a block diagram illustrating a display apparatus according to an exemplary embodiment. Figure 2 is a circuit diagram illustrating an example of each pixel included in a display apparatus according to an exemplary embodiment. Figure 3 is a graph illustrating an example of image data of a display panel. Figure 4 is a timing diagram for describing an example in which an initialization voltage is changed when image data of Figure 3 is provided in a conventional display apparatus. Figure 5is a timing diagram for describing an example of an operation of a display apparatus according to an exemplary embodiment. Figure 6 is a diagram illustrating an example of a compensation map included in a display apparatus according to an exemplary embodiment.

[0041] Referring to Figure 1 , a display apparatus 100 according to an exemplary embodiment can include a display panel 200 including pixels PX and a display driver 300 for driving the pixels PX. In some exemplary embodiments, the display driver 300 can include a scan driver 310, a data driver 320, a power supply 330, a sensing circuit 340, and a controller 350. In some exemplary embodiments, the display driver 300 can further include an emission driver for providing an emission signal to the pixels PX.

[0042] The display panel 200 can include gate write lines, gate initialization lines, data lines DL, constant voltage lines for transferring constant voltages, and the pixels PX coupled to the gate write lines, the gate initialization lines, the data lines DL, and the constant voltage lines. According to some embodiments, the pixels PX are organized into a matrix according to a plurality of columns and a plurality of rows, and each of the data lines DL can provide a voltage from the data driver 320 to a column of the pixels PX.

[0043] In some exemplary embodiments, the constant voltages can include an initialization voltage VINIT, a high power supply voltage ELVDD, and / or a low power supply voltage ELVSS, and the constant voltage lines can include an initialization voltage line VINITL, a line of the high power supply voltage ELVDD, and / or a line of the low power supply voltage ELVSS. For example, as shown in Figure 1 , the initialization voltage line VINITL can include horizontal lines respectively formed at rows of the pixels PX and at least one vertical line for connecting the horizontal lines. However, the structure of the initialization voltage line VINITL is not limited to the example of Figure 1 .

[0044] The display panel 200 can further include a feedback line FBL coupled to the constant voltage lines. In some exemplary embodiments, as shown in Figure 1 , the feedback line FBL can be coupled to the initialization voltage line VINITL for transferring the initialization voltage VINIT to the pixels PX. Further, in some exemplary embodiments, the feedback line FBL can be formed around a display area 210 of the display panel 200 where the pixels PX or an emission layer of the pixels PX are disposed. Additionally or alternatively, the feedback line FBL can be coupled to the initialization voltage line VINITL at an edge portion of the display area 210. For example, as shown in Figure 1As shown, the feedback line FBL can be coupled to the initialization voltage line VINITL at the edge of the display area 210 away from the display driver 300. However, the connection location of the feedback line FBL to the initialization voltage line VINITL is not limited to... Figure 1 Example. In another example, the feedback line FBL may be coupled to the initialization voltage line VINITL at the edge of the display area 210 near the display driver 300.

[0045] In some exemplary embodiments, the display panel 200 may be an OLED display panel in which each pixel PX includes an organic light-emitting diode (OLED). For example, as Figure 2 As shown, each pixel PX may include a driving transistor T1, a switching transistor T2, a compensation transistor T3, a storage capacitor CST, a first initialization transistor T4, a first emitter transistor T5, a second emitter transistor T6, a second initialization transistor T7, and an organic light-emitting diode EL. The driving transistor T1 can be used to generate a driving current. The switching transistor T2 can be used to transfer the data voltage DV of the data line DL to the source of the driving transistor T1 in response to the gate write signal GW from the scan driver 310. The compensation transistor T3 can be used to connect the driving transistor T1 to a diode in response to the gate write signal GW. The storage capacitor CST can be used to store the data voltage DV transferred by the driving transistor T1 via the switching transistor T2 and the diode. The first initialization transistor T4 can be used to provide an initialization voltage VINIT to the gate node NG connected to the storage capacitor CST and the gate of the driving transistor T1 in response to the gate initialization signal GI from the scan driver 310. The first emitter transistor T5 can be used to connect the high supply voltage ELVDD to the source of the driving transistor T1 in response to the emit signal EM from the emitter driver. The second emitter transistor T6 can be used to connect the drain of the drive transistor T1 to the organic light-emitting diode EL in response to the emitter signal EM. The second initialization transistor T7 can be used to provide an initialization voltage VINIT to the organic light-emitting diode EL in response to the gate initialization signal GI. The organic light-emitting diode EL can be used to emit light based on a drive current from a line of high supply voltage ELVDD to a line of low supply voltage ELVSS. In other exemplary embodiments, the second initialization transistor T7 can operate in response to a gate write signal GW or another signal.

[0046] like Figure 2As shown in FIG. 1, a parasitic capacitor CINIT can be formed between the data line DL and the initialization voltage line VINITL. Thus, when the data voltage DV of the data line DL changes, the initialization voltage VINIT of the initialization voltage line VINITL can be undesirably changed due to the coupling between the data line DL and the initialization voltage line VINITL. Although Figure 2 An example of a pixel PX having a 7T1C structure with seven transistors T1 to T7 and one capacitor CST is shown, but the structure of each pixel PX of the display apparatus 100 according to exemplary embodiments is not limited to the 7T1C structure. In other exemplary embodiments, the display panel 200 can be a liquid crystal display (LCD) panel or any other suitable display panel.

[0047] The scan driver 310 can generate the gate initialization signal GI and the gate write signal GW based on a scan control signal SCTRL received from the controller 350, and can sequentially provide the gate initialization signal GI and the gate write signal GW to the pixels PX based on the pixel row. In some exemplary embodiments, the scan control signal SCTRL can include, but is not limited to, a scan start signal and a scan clock signal. In some exemplary embodiments, as shown in FIG. 1, the scan driver 310 can be integrated or formed in a peripheral portion of the display panel 200 adjacent to the display area 210. In other exemplary embodiments, the scan driver 310 can be implemented with one or more integrated circuits. Figure 1

[0048] The data driver 320 can generate the data voltage DV based on a data control signal DCTRL and compensated image data CIDAT received from the controller 350, and can provide the data voltage DV to the pixels PX through the data line DL. In some embodiments, the compensated image data can be determined by adjusting the gray scale of the image data. For example, if a change in the constant voltage level would result in a reduced brightness of the pixel PX, the gray scale of the image data of the pixel PX can be increased to increase the brightness of the pixel PX. This increase in the gray scale can compensate for the change in the constant voltage to achieve a desired brightness of the pixel PX.

[0049] In some exemplary embodiments, the data control signal DCTRL can include, but is not limited to, an output data enable signal, a horizontal start signal, and a load signal. In some exemplary embodiments, the display driver 300 can be implemented with a signal integrated circuit. The signal integrated circuit can include the data driver 320 and the controller 350. Thus, the signal integrated circuit can be referred to as a timing controller-embedded data driver (TED). As shown in FIG. 1, the data driver 320 can be integrated or formed in a peripheral portion of the display panel 200 adjacent to the display area 210. In other exemplary embodiments, the data driver 320 can be implemented with one or more integrated circuits. Figure 1 ​As shown in FIG. 1, the TED can further include a power supply 330 and a sensing circuit 340, and the scan driver 310 can be formed on the display panel 200. However, the implementation of the display driver 300 and components is not limited to the TED. In other exemplary embodiments, the data driver 320 and the controller 350 can be implemented with separate integrated circuits.

[0050] The power supply 330 can convert an input voltage (e.g., a battery voltage or a system voltage) into an initialization voltage VINIT, a high power supply voltage ELVDD, and a low power supply voltage ELVSS. Additionally or alternatively, the power supply 330 can provide the initialization voltage VINIT, the high power supply voltage ELVDD, and the low power supply voltage ELVSS to the pixel PX. As shown in FIG. 1, the initialization voltage VINIT can be provided to the pixel PX through an initialization voltage line VINITL. Thus, a constant voltage can be provided by the power supply 330 without passing through the data driver 320. Figure 1 As shown in FIG. 1, the initialization voltage VINIT generated by the power supply 330 can be provided to the pixel PX through the initialization voltage line VINITL. Thus, a constant voltage can be provided by the power supply 330 without passing through the data driver 320.

[0051] Further, in some exemplary embodiments, the power supply 330 can provide the initialization voltage VINIT having a desired voltage level to the sensing circuit 340, so that the sensing circuit 340 can compare the initialization voltage VINIT at the initialization voltage line VINITL with the initialization voltage VINIT having the desired voltage level. In some exemplary embodiments, as shown in FIG. 1, the power supply 330 can be included in the TED. In other exemplary embodiments, the power supply 330 can be implemented with a separate integrated circuit, and the integrated circuit can be implemented with a power management integrated circuit (PMIC). Figure 1 As shown in FIG. 1, the power supply 330 can be included in the TED. In other exemplary embodiments, the power supply 330 can be implemented with a separate integrated circuit, and the integrated circuit can be implemented with a power management integrated circuit (PMIC).

[0052] When the data voltage DV changes, the sensing circuit 340 can sense an amount of change in the initialization voltage VINIT caused by the coupling between the data line DL and the initialization voltage line VINITL through the feedback line FBL. Additionally or alternatively, the sensing circuit 340 can generate a change amount sensing value CSV representing the sensed amount of change in the initialization voltage VINIT. For example, the sensing circuit 340 can receive the initialization voltage VINIT at the initialization voltage line VINITL through the feedback line FBL, receive the initialization voltage VINIT having the desired voltage level from the power supply 330, and can sense the amount of change in the initialization voltage VINIT by comparing the initialization voltage VINIT at the initialization voltage line VINITL with the initialization voltage VINIT having the desired voltage level. In some exemplary embodiments, as shown in FIG. 1, the sensing circuit 340 can be included in the TED. In other exemplary embodiments, the sensing circuit 340 can be implemented with a separate integrated circuit. Figure 1 As shown in FIG. 1, the sensing circuit 340 can be included in the TED. In other exemplary embodiments, the sensing circuit 340 can be implemented with a separate integrated circuit.

[0053] The controller 350 (e.g., a timing controller (TCON)) can receive image data IDAT and control signals CTRL from an external host processor (e.g., a graphics processing unit (GPU) or a graphics card). In some example embodiments, the image data IDAT can be, but is not limited to, RGB image data including red image data, green image data, and blue image data. Further, in some example embodiments, the control signals CTRL can include, but are not limited to, a vertical synchronization signal, a horizontal synchronization signal, a main clock signal, an input data enable signal, and the like. The controller 350 can control the operations of the scan driver 310, the data driver 320, the power supply 330, the sensing circuit 340, and the emission driver based on the image data IDAT and the control signals CTRL.

[0054] In a conventional display apparatus not including the feedback line FBL and the sensing circuit 340, when the data voltage DV changes or transitions, a constant voltage (e.g., an initialization voltage VINIT) can be changed by coupling between the data line DL and a constant voltage line (e.g., an initialization voltage line VINITL). Thus, due to the change in the constant voltage, the pixel PX can not emit light with a desired brightness, and horizontal crosstalk can occur. In the conventional display apparatus, in a case where the image data IDAT of the display panel 400 is provided as shown in Figure 3 , the pixels PX of the display panel 400 can be operated as shown in Figure 4 .

[0055] For example, as shown in Figure 3 and Figure 4 , in the pixels PX disposed at the first portion 410 of the display panel 400 where the data voltages DV of the pixels PX of the current row are substantially the same as the data voltages DV of the pixels PX of the previous row, the initialization voltage VINIT can have a constant voltage level 440 or a desired voltage level 440. Then, as shown in 470 of Figure 4 , the voltage V_NG of the gate node NG at the pixels PX disposed at the first portion 410 of the display panel 400 can be initialized to the desired voltage level 440 in response to the gate initialization signal GI, and can have a voltage level corresponding to the 128 gray scale 128G in response to the gate write signal GW. Thus, in the pixels PX disposed at the first portion 410 of the display panel 400, when the emission signal EM is applied, the drive current IEL flowing through the organic light emitting diode EL can have a desired current level 510 corresponding to the 128 gray scale 128G.

[0056] However, for a pixel PX located at the second portion 420 of the display panel 400, if the image data IDAT of the previous row of pixel PX represents 128 gray levels (128G) and a portion of the image data IDAT of the current row of pixel PX represents 0 gray levels (0G), the data voltage DV of the current row of pixel PX may increase from the data voltage DV of the previous row of pixel PX. If the data voltage DV increases, the initialization voltage VINIT may be changed to a voltage level 450 that may increase from the desired voltage level 440 due to the coupling between the data line DL and the initialization voltage line VINITL.

[0057] If the initial voltage VINIT has an increased voltage level of 450, then as Figure 4 As shown in section 480, the voltage V_NG of the gate node NG at the pixel PX located in the second portion 420 of the display panel 400 may not be sufficiently initialized when the gate initialization signal GI is applied, and may have a voltage level higher than the voltage level corresponding to the 128 gray level 128G when the gate write signal GW is applied. Therefore, in the pixel PX located in the second portion 420 of the display panel 400, when the emission signal EM is applied, the drive current IEL flowing through the organic light-emitting diode EL may have a current level 520 lower than the desired current level 510 corresponding to the 128 gray level 128G. As a result, the pixel PX located in the second portion 420 of the display panel 400 may emit light with a brightness lower than the desired brightness, and horizontal crosstalk may occur in the display panel 400 of a conventional display device. Therefore, embodiments of this disclosure can sense changes in a constant voltage (i.e., the initialization voltage VINIT) and provide compensated image data to compensate for horizontal crosstalk.

[0058] Furthermore, for a pixel PX located at the third portion 430 of the display panel 400, if a portion of the image data IDAT of the previous row of pixel PX represents 0 grayscale level 0G and the image data IDAT of the current row of pixel PX represents 128 grayscale level 128G, the data voltage DV of the current row of pixel PX may be lower than that of the previous row of pixel PX. If the data voltage DV is lowered, the initialization voltage VINIT may be changed to a voltage level 460 that may be lower than the desired voltage level 440 due to the coupling between the data line DL and the initialization voltage line VINITL.

[0059] If the initialization voltage VINIT has a reduced voltage level of 460, then as Figure 4As shown in FIG. 490, when the gate initialization signal GI is applied, the voltage V_NG of the gate node NG at the pixel PX provided at the third portion 430 of the display panel 400 can be over-initialized. Thus, when the gate write signal GW is applied, the voltage V_NG can have a voltage level lower than the voltage level corresponding to the 128 gray scale 128G. Thus, in the pixel PX provided at the third portion 430 of the display panel 400, when the emission signal EM is applied, the drive current IEL flowing through the organic light emitting diode EL can have a current level 530 higher than the expected current level 510 corresponding to the 128 gray scale 128G. As a result, the pixel PX provided at the third portion 430 of the display panel 400 can emit light at a luminance higher than the expected luminance, and horizontal crosstalk can occur in the display panel 400 of the conventional display apparatus.

[0060] However, in the display apparatus 100 according to the exemplary embodiment, the display driver 300 can sense the amount of change in the initialization voltage VINIT through the feedback line FBL, can generate the compensated image data CIDAT by compensating the image data IDAT according to the sensed amount of change in the initialization voltage VINIT, and can provide the data voltage DV corresponding to the compensated image data CIDAT to the pixel PX. As a result, the horizontal crosstalk caused by the coupling between the data line DL and the initialization voltage line VINITL can be reduced or eliminated.

[0061] For example, as shown in FIG. 490, when the gate initialization signal GI is applied, the voltage V_NG of the gate node NG at the pixel PX provided at the third portion 430 of the display panel 400 can be over-initialized. Thus, when the gate write signal GW is applied, the voltage V_NG can have a voltage level lower than the voltage level corresponding to the 128 gray scale 128G. Thus, in the pixel PX provided at the third portion 430 of the display panel 400, when the emission signal EM is applied, the drive current IEL flowing through the organic light emitting diode EL can have a current level 530 higher than the expected current level 510 corresponding to the 128 gray scale 128G. As a result, the pixel PX provided at the third portion 430 of the display panel 400 can emit light at a luminance higher than the expected luminance, and horizontal crosstalk can occur in the display panel 400 of the conventional display apparatus. Figure 5 For example, as shown in FIG. 490, when the gate initialization signal GI is applied, the voltage V_NG of the gate node NG at the pixel PX provided at the third portion 430 of the display panel 400 can be over-initialized. Thus, when the gate write signal GW is applied, the voltage V_NG can have a voltage level lower than the voltage level corresponding to the 128 gray scale 128G. Thus, in the pixel PX provided at the third portion 430 of the display panel 400, when the emission signal EM is applied, the drive current IEL flowing through the organic light emitting diode EL can have a current level 530 higher than the expected current level 510 corresponding to the 128 gray scale 128G. As a result, the pixel PX provided at the third portion 430 of the display panel 400 can emit light at a luminance higher than the expected luminance, and horizontal crosstalk can occur in the display panel 400 of the conventional display apparatus.

[0062] By compensating the image data IDAT of the pixel PX in the N+1th row based on the change-sensing value CSV representing the change in the sensed initialization voltage VINIT, the controller 350 of the display driver 300 can generate compensated image data CIDAT with a compensation value CMPV corresponding to the change-sensing value CSV. The data driver 320 of the display driver 300 can, in response to the N+1th gate write signal GW[N+1], provide a data voltage DV with the compensation value CMPV applied to the pixel PX in the N+1th row based on the compensated image data CIDAT. Thus, the pixel PX in the N+1th row can emit light at the desired brightness based on the data voltage DV with the compensation value CMPV applied, and horizontal crosstalk can be reduced or eliminated in the display device 100 according to the exemplary embodiment.

[0063] In some exemplary embodiments, to generate compensated image data CIDAT by compensating image data IDAT based on change amount sensed values ​​CSV, controller 350 may include a data compensator 360 and a compensation map 370. Data compensator 360 may determine a compensation value CMPV corresponding to the change amount sensed values ​​CSV, and may generate compensated image data CIDAT by adding the compensation value CMPV to the image data IDAT. In some exemplary embodiments, compensation map 370 may store multiple compensation values ​​CMPV based on multiple change amount sensed values ​​CSV and multiple gray levels, and data compensator 360 may determine the compensation value CMPV corresponding to the change amount sensed values ​​CSV by using compensation map 370.

[0064] For example, such as Figure 6 As shown, the compensation graph 370 can store multiple compensation values ​​CMPV based on multiple change amount sensed values ​​CSV and multiple gray levels. A gray level (or grayscale) can refer to a value indicating the brightness of a pixel. In one example, the gray level can be in the range of 0 to 255. In some embodiments, the gray level can be combined with the value of each color of the pixel to determine the brightness of the colored subpixels within the pixel.

[0065] For example, the change sensing value CSV can be approximately +0.3V, approximately +0.2V, approximately +0.1V, approximately 0V, approximately -0.1V, approximately -0.2V, and approximately -0.3V. Additionally or alternatively, the multiple gray levels can be 0 gray level (0G), 32 gray level (32G), 64 gray level (64G), 96 gray level (96G), 128 gray level (128G), 160 gray level (160G), 192 gray level (192G), 224 gray level (224G), and 255 gray level (255G). This disclosure is not limited to these change sensing values ​​CSV and multiple gray levels.

[0066] For example, in a case where the amount-of-change sensing value CSV indicates approximately +0.3V, the data compensator 360 can receive compensation values CMPV indicating 0 gray scale 0G, +8 gray scale +8G, +7 gray scale +7G, +7 gray scale +7G, +7 gray scale +7G, +6 gray scale +6G, +6 gray scale +6G, +5 gray scale +5G, and 0 gray scale 0G from the compensation map 370, respectively, for the image data IDAT indicating 0 gray scale 0G, 32 gray scale 32G, 64 gray scale 64G, 96 gray scale 96G, 128 gray scale 128G, 160 gray scale 160G, 192 gray scale 192G, 224 gray scale 224G, and 255 gray scale 255G, and can generate compensated image data CIDAT indicating 0 gray scale 0G, 40 gray scale, 71 gray scale, 103 gray scale, 135 gray scale, 166 gray scale, 198 gray scale, 229 gray scale, and 255 gray scale 255G by adding the compensation values CMPV to the image data IDAT, respectively.

[0067] In another example, in a case where the amount-of-change sensing value CSV indicates approximately -0.3V, the data compensator 360 can receive compensation values CMPV indicating 0 gray scale 0G, -8 gray scale -8G, -7 gray scale -7G, -7 gray scale -7G, -7 gray scale -7G, -6 gray scale -6G, -5 gray scale -5G, -4 gray scale -4G, and 0 gray scale 0G from the compensation map 370, respectively, for the image data IDAT indicating 0 gray scale 0G, 32 gray scale 32G, 64 gray scale 64G, 96 gray scale 96G, 128 gray scale 128G, 160 gray scale 160G, 192 gray scale 192G, 224 gray scale 224G, and 255 gray scale 255G, and can generate compensated image data CIDAT indicating 0 gray scale 0G, 24 gray scale, 57 gray scale, 89 gray scale, 121 gray scale, 154 gray scale, 187 gray scale, 220 gray scale, and 255 gray scale 255G by adding the compensation values CMPV to the image data IDAT, respectively. Although Figure 6 An example of the compensation map 370 is illustrated, but the compensation map 370 according to the exemplary embodiment is not limited to Figure 6 An example of the compensation map 370 is illustrated, but the compensation map 370 according to the exemplary embodiment is not limited to

[0068] As described above, in the display apparatus 100 according to the exemplary embodiment, the amount of change of the initialization voltage VINIT caused by coupling between the data line DL and the initialization voltage line VINITL can be sensed through the feedback line FBL, and the image data IDAT can be compensated according to the sensed amount of change of the initialization voltage VINIT. Then, horizontal crosstalk caused by coupling between the data line DL and the initialization voltage line VINITL can be reduced or eliminated.

[0069] Figure 7 is a flowchart illustrating a method of operating a display apparatus according to an exemplary embodiment.

[0070] Referring to Figure 1 and Figure 7 In the method of operating the display apparatus 100 according to an exemplary embodiment, the sensing circuit 340 can sense an amount of change in the constant voltage of the constant voltage line through the feedback line FBL (step S610). In some exemplary embodiments, the sensing circuit 340 can sense the amount of change in the constant voltage caused by coupling between the data line DL and the constant voltage line when the data voltage DV of the data line DL changes through the feedback line FBL. In some exemplary embodiments, as shown in Figure 1 , the constant voltage can be an initialization voltage VINIT, the constant voltage line can be an initialization voltage line VINITL, and the sensing circuit 340 can sense the amount of change in the initialization voltage VINIT through the feedback line FBL. In other exemplary embodiments, as shown in Figure 12 , the constant voltage can be a power supply voltage ELVDD (e.g., a high power supply voltage ELVDD), the constant voltage line can be a power supply voltage line ELVDDL, and the sensing circuit 340 can sense the amount of change in the power supply voltage ELVDD through the feedback line FBL.

[0071] The data compensator 360 can generate compensated image data CIDAT by compensating the image data IDAT according to the sensed amount of change in the constant voltage (step S630). For example, the sensing circuit 340 can sense the amount of change in the constant voltage caused when the data voltage DV of the pixel PX of the Nth row changes from the data voltage DV of the pixel PX of the (N-1)th row through the feedback line FBL. The data compensator 360 can generate compensated image data CIDAT of the pixel PX of the (N+1)th row by compensating the image data IDAT of the pixel PX of the (N+1)th row according to the sensed amount of change in the constant voltage.

[0072] The data driver 320 can receive the compensated image data CIDAT from the data compensator 360 and can provide the data voltage DV corresponding to the compensated image data CIDAT to the pixel PX (step S650). Then, horizontal crosstalk caused by coupling between the data line DL and the constant voltage line can be reduced or eliminated.

[0073] Figure 8 is a block diagram illustrating a display apparatus according to an exemplary embodiment.

[0074] Referring to Figure 8, the display device 100a according to an exemplary embodiment can include a display panel 200a and a display driver 300a for driving the display panel 200a. Except that the display driver 300a can compensate for image data by using the first feedback line FBL1 and the second feedback line FBL2, Figure 8 The display device 100a according to an exemplary embodiment can have a similar configuration and similar operations as the display device 100. Figure 1 The display device 100a according to an exemplary embodiment can have a similar configuration and similar operations as the display device 100.

[0075] The first feedback line FBL1 can be coupled to a constant voltage line (e.g., an initialization voltage line or a power voltage line) at a first edge portion 212a of the display area 210a of the display panel 200a away from the display driver 300a. The second feedback line FBL2 can be coupled to the constant voltage line at a second edge portion 214a of the display area 210a close to the display driver 300a.

[0076] For a first half (e.g., an upper half DRUH) of the display area 210a, the sensing circuit 340a of the display driver 300a can generate a variation amount sensing value CSV by sensing a variation amount of a constant voltage (e.g., an initialization voltage or a power voltage) through the first feedback line FBL1, and the data compensator 360a of the display driver 300a can compensate for image data of pixels disposed at the upper half DRUH of the display area 210a based on the variation amount of the constant voltage sensed through the first feedback line FBL1. Also, for a second half (e.g., a lower half DRLH) of the display area 210a, the sensing circuit 340a of the display driver 300a can generate a variation amount sensing value CSV by sensing a variation amount of a constant voltage through the second feedback line FBL2. The data compensator 360a of the display driver 300a can compensate for image data of pixels disposed at the lower half DRLH of the display area 210a based on the variation amount of the constant voltage sensed through the second feedback line FBL2. Thus, by using the first feedback line FBL1 and the second feedback line FBL2, the variation amount of the constant voltage can be sensed more accurately.

[0077] Figure 9 is a block diagram illustrating a display device according to an exemplary embodiment.

[0078] Referring to Figure 9 , the display device 100b according to an exemplary embodiment can include a display panel 200b and a display driver 300b for driving the display panel 200b. Except that the display panel 200b can include M feedback lines FBL1, FBL2, …, FBLM-1, and FBLM, Figure 9 The display device 100b according to an exemplary embodiment can have a similar configuration and similar operations as the display device 100. Figure 1The display device 100c according to the exemplary embodiment can include a display panel 200c and a display driver 300c for driving the display panel 200c. Except that the display driver 300c can include M compensation graphs 371c, 372c, …, 37Mc, where M is an integer greater than or equal to 1,

[0079] The display area 210c of the display panel 200c can be divided into M display blocks DB1, DB2, …, DBM-1, and DBM. The M compensation graphs 371c, 372c, …, 37Mc can be coupled to the constant voltage line (e.g., the initialization voltage line or the power voltage line) at the M display blocks DB1, DB2, …, DBM-1, and DBM, respectively.

[0080] The display driver 300c can compensate the image data of the pixels disposed at one of the M display blocks DB1, DB2, …, DBM-1, and DBM based on the amount of change in the constant voltage (e.g., the initialization voltage or the power voltage) sensed through one of the M compensation graphs 371c, 372c, …, 37Mc corresponding to the one of the M display blocks DB1, DB2, …, DBM-1, and DBM. For example, for the first display block DB1, the sensing circuit 340c of the display driver 300c can generate the amount-of-change sensing value CSV by sensing the amount of change in the constant voltage through the first compensation graph 371c, and the data compensator 360c of the display driver 300c can compensate the image data of the pixels disposed at the first display block DB1 in response to the amount-of-change sensing value CSV based on the amount of change in the constant voltage sensed through the first compensation graph 371c.

[0081] Further, for the Mth display block DBM, the sensing circuit 340c can generate the amount-of-change sensing value CSV by sensing the amount of change in the constant voltage through the Mth compensation graph 37Mc. The data compensator 360c can compensate the image data of the pixels disposed at the Mth display block DBM in response to the amount-of-change sensing value CSV based on the amount of change in the constant voltage sensed through the Mth compensation graph 37Mc. Thus, by using the M compensation graphs 371c, 372c, …, 37Mc, the amount of change in the constant voltage can be sensed more accurately.

[0082] Figure 10 is a block diagram illustrating a display device according to an exemplary embodiment.

[0083] Reference Figure 10 The display device 100c according to the exemplary embodiment can include a display panel 200c and a display driver 300c for driving the display panel 200c. Except that the display driver 300c can include M compensation graphs 371c, 372c, …, 37Mc, where M is an integer greater than or equal to 1, Figure 10The display device 100c can have a similar configuration and similar operations to the display device 100. Figure 1 The display device 100c can have a similar configuration and similar operations to the display device 100.

[0084] The display area 210c of the display panel 200c can be divided into M display blocks DB1, DB2, …, DBM-1, and DBM. The display driver 300c can include M compensation maps 371c, 372c, …, 37Mc for the M display blocks DB1, DB2, …, DBM-1, and DBM, respectively. The display driver 300c can compensate image data of pixels disposed at one of the M display blocks DB1, DB2, …, DBM-1, and DBM by using one of the M compensation maps 371c, 372c, …, 37Mc corresponding to the one display block. For example, the data compensator 360c of the display driver 300c can compensate image data of pixels disposed at the first display block DB1 by using the first compensation value CMPV1 received from the first compensation map 371c. Additionally or alternatively, the data compensator 360c of the display driver 300c can compensate image data of pixels disposed at the second display block DB2 by using the second compensation value CMPV2 received from the second compensation map 372c. The data compensator 360c of the display driver 300c can also compensate image data of pixels disposed at the Mth display block DBM by using the Mth compensation value CMPVM received from the Mth compensation map 37Mc. Accordingly, image data can be more accurately compensated by using the M compensation maps 371c, 372c, …, 37Mc.

[0085] Figure 11 is a block diagram illustrating a display device according to an exemplary embodiment.

[0086] Referring to Figure 11 The display device 100d according to an exemplary embodiment can include a display panel 200d and a display driver 300d for driving the display panel 200d. Except that the display driver 300d can include a first compensation map 371d for the uppermost display block DB1 and a second compensation map 372d for the lowermost display block DBM, the display device 100d can have a similar configuration and similar operations to the display device 100. Figure 11 The display device 100d can have a similar configuration and similar operations to the display device 100. Figure 1 The display device 100d can have a similar configuration and similar operations to the display device 100.

[0087] The display area 210d of the display panel 200d can be divided into M display blocks DB1, DB2, …, DBM-1, and DBM. The display driver 300d can include a first compensation map 371d for the uppermost display block DB1 among the M display blocks DB1, DB2, …, DBM-1, and DBM and a second compensation map 372d for the lowermost display block DBM among the M display blocks DB1, DB2, …, DBM-1, and DBM. The data compensator 360d of the display driver 300d can compensate image data of pixels disposed at the uppermost display block DB1 by using a first compensation value CMPV1 received from the first compensation map 371d and can compensate image data of pixels disposed at the lowermost display block DBM by using a second compensation value CMPV2 received from the second compensation map 372d.

[0088] Further, for the display blocks DB2, …, DBM-1 between the uppermost display block DB1 and the lowermost display block DBM among the M display blocks DB1, DB2, …, DBM-1, and DBM, the data compensator 360d can generate an interpolated compensation value by interpolating the first compensation value CMPV1 extracted from the first compensation map 371d and the second compensation value CMPV2 extracted from the second compensation map 372d, and can compensate image data of pixels disposed at the display blocks DB2, …, DBM-1 between the uppermost display block DB1 and the lowermost display block DBM by using the interpolated compensation value. Thus, the image data can be more accurately compensated by using the first compensation map 371d and the second compensation map 372d.

[0089] Figure 12 is a block diagram illustrating a display apparatus according to an exemplary embodiment, Figure 13 is a circuit diagram illustrating an example of each pixel included in a display apparatus according to an exemplary embodiment, and Figure 14 is a timing diagram for describing an example of an operation of a display apparatus according to an exemplary embodiment.

[0090] Referring to Figure 12 The display apparatus 700 according to an exemplary embodiment can include a display panel 800 including pixels PXa and a display driver 900 for driving the pixels PXa. In some exemplary embodiments, the display driver 900 can include a scan driver 910, a data driver 920, a power supply 930, a sensing circuit 940, and a controller 950. The controller 950 can include a data compensator 960, a compensation map 970, and a data memory 980. Except that the feedback line FBL can be coupled to the power supply voltage line ELVDDL for transmitting the power supply voltage ELVDD and the controller 950 can further include the data memory 980, Figure 12 The display apparatus 700 of FIG.Figure 1 The display device 100 of FIG. 1 has a similar configuration and similar operations.

[0091] The display panel 800 can include a power voltage line ELVDDL, and can further include a feedback line FBL coupled to the power voltage line ELVDDL. In some exemplary embodiments, the power voltage line ELVDDL can have a mesh structure with a plurality of horizontal lines and a plurality of vertical lines as shown in FIG. 1, but the structure of the power voltage line ELVDDL is not limited to the example of FIG. 1. Figure 12 Figure 12 Figure 12 Further, as shown in FIG. 1, the feedback line FBL can be coupled to the power voltage line ELVDDL at an edge portion of the display area 810 away from the display driver 900. However, the connection position at which the feedback line FBL is connected to the power voltage line ELVDDL is not limited to the example of FIG. 1. In another example, the feedback line FBL can be coupled to the power voltage line ELVDDL at an edge portion of the display area 810 close to the display driver 900. In other exemplary embodiments, the display panel 800 can include two feedback lines FBL as shown in FIG. 2, or can include M feedback lines FBL as shown in FIG. 3. Figure 12 Figure 8 Figure 9

[0092] In each pixel PXa of the display panel 800, as shown in FIG. 1, a parasitic capacitor CELVDD can be formed between the data line DL and the power voltage line ELVDDL. Then, when the data voltage DV of the data line DL changes, the power voltage ELVDD of the power voltage line ELVDDL can undesirably change due to the coupling between the data line DL and the power voltage line ELVDDL. Figure 13

[0093] In the display device 700 according to exemplary embodiments, the display driver 900 can sense the amount of change in the power voltage ELVDD through the feedback line FBL, can generate compensated image data CIDAT by compensating the image data IDAT according to the sensed amount of change in the power voltage ELVDD, and can provide a data voltage DV corresponding to the compensated image data CIDAT to the pixel PXa. Then, horizontal crosstalk caused by the coupling between the data line DL and the power voltage line ELVDDL can be reduced or eliminated.

[0094] In some exemplary embodiments, as shown in FIG. 1, the display driver 900 can include a compensation unit 910 and a data voltage generator 920. Figure 14 ​​​​​​As shown in FIG. 9, the sensing circuit 940 of the display driver 900 can generate a change amount sensing value CSV by sensing a change amount of the power supply voltage ELVDD through the feedback line FBL in the previous frame period PFP. The image data IDAT in the previous frame period PFP (i.e., PIDAT) can be stored in the data memory 980. In a case where the image data IDAT in the current frame period CFP is substantially the same as the image data IDAT in the previous frame period PFP stored in the data memory 980, the data compensator 960 of the display driver 900 can generate compensated image data CIDAT to which a compensation value CMPV is applied.

[0095] Generating the compensated image data CIDAT can be performed by compensating the image data IDAT in the current frame period CFP according to the change amount of the power supply voltage ELVDD sensed in the previous frame period PFP. In some embodiments, the grayscale values of the image data can be adjusted to compensate for the sensed change amount. For example, increasing the grayscale values can increase the brightness of the pixels to compensate for a decrease in brightness caused by the sensed change amount of the power supply voltage.

[0096] Thus, in the current frame period CFP, the data voltage DV to which the compensation value CMPV is applied can be provided to the pixel PXa, which can emit light at a desired brightness, and in the display apparatus 700 according to an exemplary embodiment, horizontal crosstalk caused by coupling between the data line DL and the power supply voltage line ELVDDL can be reduced or eliminated.

[0097] Figure 15 is a block diagram illustrating an electronic apparatus including a display apparatus according to an exemplary embodiment.

[0098] Reference Figure 15 The electronic apparatus 1100 can include a processor 1110, a memory apparatus 1120, a storage apparatus 1130, an input / output (I / O) apparatus 1140, a power supply 1150, and a display apparatus 1160. The electronic apparatus 1100 can further include a plurality of ports for communication with a video card, a sound card, a memory card, a universal serial bus (USB) apparatus, other electronic apparatuses, etc.

[0099] The processor 1110 can perform various computing functions or tasks. The processor 1110 can be an application processor (AP), a microprocessor, a central processing unit (CPU), etc. The processor 1110 can be coupled to other components via an address bus, a control bus, a data bus, etc. Further, in some exemplary embodiments, the processor 1110 can be further coupled to an extension bus, such as a peripheral component interconnect (PCI) bus.

[0100] The memory device 1120 can store data for operation of the electronic device 1100. For example, the memory device 1120 can include at least one non-volatile memory device such as an erasable programmable read-only memory (EPROM) device, an electrically erasable programmable read-only memory (EEPROM) device, a flash memory device, a phase-change random access memory (PRAM) device, a resistive random access memory (RRAM) device, a nano floating gate memory (NFGM) device, a polymer random access memory (PoRAM) device, a magnetic random access memory (MRAM) device, a ferroelectric random access memory (FRAM) device, etc., and / or at least one volatile memory device such as a dynamic random access memory (DRAM) device, a static random access memory (SRAM) device, a mobile dynamic random access memory (mobile DRAM) device, etc.

[0101] The storage device 1130 can be a solid state drive (SSD) device, a hard disk drive (HDD) device, a CD-ROM device, etc. The I / O device 1140 can be an input device such as a keyboard, a keypad, a mouse, a touch screen, etc., and an output device such as a printer, a speaker, etc. The power supply 1150 can supply power for operation of the electronic device 1100. The display device 1160 can be coupled to the other components through a bus or other communication link.

[0102] In the display device 1160, the amount of change in the constant voltage (e.g., an initialization voltage, a power supply voltage, etc.) caused by coupling between the data line and the constant voltage line can be sensed through the feedback line, and the image data can be compensated according to the sensed amount of change in the constant voltage. As a result, horizontal crosstalk caused by coupling between the data line and the constant voltage line can be reduced or eliminated.

[0103] The inventive concept can be applied to any display device 1160 and any electronic device 1100 including the display device 1160. For example, the inventive concept can be applied to a mobile phone, a smart phone, a tablet computer, a wearable electronic device, a virtual reality (VR) device, a television (TV), a digital TV, a 3D TV, a personal computer (PC), a home appliance, a laptop computer, a personal digital assistant (PDA), a portable multimedia player (PMP), a digital camera, a music player, a portable game machine, a navigation device, etc.

[0104] The foregoing is a summary of an example embodiment and should not be interpreted as limiting. Although some example embodiments have been described, those skilled in the art will readily understand that many modifications can be made to the example embodiments without substantially departing from the novel teachings and advantages of the inventive concept. Accordingly, all such modifications are intended to be included within the scope of the inventive concept defined in the claims. It should be understood, therefore, that the foregoing is intended primarily for purposes of illustration and that modifications can occur without departing from the scope of the inventive concept as defined in the appended claims.

Claims

1. A display apparatus comprising: a display panel including pixels, a data line for transferring a data voltage to the pixels, a constant voltage line for transferring a constant voltage to the pixels, and a feedback line coupled to the constant voltage line; and a display driver configured to sense an amount of change in the constant voltage through the feedback line, generate compensated image data by compensating image data according to the sensed amount of change in the constant voltage, and provide the data voltage corresponding to the compensated image data to the pixels, wherein when the constant voltage is an initialization voltage and the constant voltage line is an initialization voltage line: a gray level of the compensated image data is increased when the amount of change indicates that the initialization voltage is increased, and the gray level of the compensated image data is decreased when the amount of change indicates that the initialization voltage is decreased. the display driver is configured to sense the amount of change in the constant voltage caused by coupling between the data line and the constant voltage line when the data voltage is changed through the feedback line.

2. The display device according to claim 1, wherein the display driver is configured to sense the amount of change in the constant voltage caused when the data voltage of the pixels of an Nth row is changed from the data voltage of the pixels of an (N-1)th row, generate the compensated image data of the pixels of an (N+1)th row by compensating the image data of the pixels of the (N+1)th row according to the sensed amount of change in the constant voltage, and provide the data voltage corresponding to the compensated image data to the pixels of the (N+1)th row, where N is an integer greater than 1.

3. The display device according to claim 1, wherein the display driver comprises:

4. The display device according to claim 1, wherein a sensing circuit configured to generate an amount-of-change sensing value by sensing the amount of change in the constant voltage through the feedback line; a data compensator configured to determine a compensation value corresponding to the amount-of-change sensing value, and generate the compensated image data by adding the compensation value to the image data; and a data driver configured to receive the compensated image data from the data compensator, and provide the data voltage corresponding to the compensated image data to the pixels. the feedback line is formed around a display area of the display panel in which the pixels are disposed, and is coupled to the constant voltage line at an edge portion of the display area.

5. The display device according to claim 1, wherein the display panel includes, as the feedback line, a first feedback line coupled to the constant voltage line at a first edge portion of a display area of the display panel away from the display driver, and a second feedback line coupled to the constant voltage line at a second edge portion of the display area close to the display driver.

6. The display device according to claim 1, wherein a display area of the display panel is divided into a plurality of display blocks, and 7. The display device according to claim 1, wherein wherein the display panel includes, as the feedback line, a plurality of feedback lines coupled to the constant voltage line at the plurality of display blocks, respectively. the constant voltage is a power voltage, and the constant voltage line is a power voltage line.

8. The display device according to claim 1, wherein 9.A method of operating a display apparatus, the method comprising: ​ sensing an amount of change in a constant voltage of a constant voltage line through a feedback line; generating compensated image data by compensating image data according to the sensed amount of change in the constant voltage; and providing a data voltage to a pixel based on the compensated image data, wherein when the constant voltage is an initialization voltage and the constant voltage line is an initialization voltage line: a gray scale of the compensated image data is increased when the amount of change indicates that the initialization voltage is increased, and the gray scale of the compensated image data is decreased when the amount of change indicates that the initialization voltage is decreased.

Images