KR102598197B1 - Light Emitting Display Device and Driving Method of the same - Google Patents

Abstract

The present invention provides a light emitting display device including a display panel, a scan driver, and a data driver. The display panel displays images. The scan driver outputs a scan signal to the display panel. The data driver outputs a data voltage to the display panel, outputting red, green, and blue data voltages for 3/4 horizontal time and black data voltage for the remaining 1/4 horizontal time.

Description

Light emitting display device and driving method thereof {Light Emitting Display Device and Driving Method of the same}

The present invention relates to a light emitting display device and a method of driving the same.

As information technology develops, the market for display devices, which are a connecting medium between users and information, is growing. Accordingly, the use of display devices such as light emitting display (LED), quantum dot display (QDD), and liquid crystal display (LCD) is increasing.

The display devices described above include a display panel including subpixels, a driver that outputs a driving signal to drive the display panel, and a power supply that generates power to be supplied to the display panel or the driver.

The above display devices can display images by transmitting light or emitting light directly when driving signals, such as scan signals and data signals, are supplied to the subpixels formed on the display panel. .

Meanwhile, among the display devices described above, the light emitting display device has many advantages such as electrical and optical characteristics such as fast response speed, high brightness, and wide viewing angle, as well as mechanical characteristics that can be implemented in a flexible form. However, light emitting display devices still have room for improvement in order to operate at high resolution, so continuous research in this regard is necessary.

The present invention to solve the problems of the above-described background technology is to improve the phenomenon of insufficient data voltage charging time when writing black data based on a structure in which multiple subpixels share one data line. In addition, the present invention provides a data voltage application method suitable for implementing a high-resolution light emitting display device and a black data writing method that can be used even under low-frequency driving conditions.

As a means of solving the above-mentioned problem, the present invention provides a light emitting display device including a display panel, a scan driver, and a data driver. The display panel displays images. The scan driver outputs a scan signal to the display panel. The data driver outputs a data voltage to the display panel, outputting red, green, and blue data voltages for 3/4 horizontal time and black data voltage for the remaining 1/4 horizontal time.

The red, green, and blue data voltages are separately applied to the red, green, and blue subpixels located on the first horizontal line of the display panel, and the black data voltage is applied separately to the Nth horizontal line of the display panel (N is an integer of 2 or more. ) can be commonly applied to the red, green, and blue subpixels located in .

The red, green, and blue subpixels located on the first horizontal line sequentially receive data voltages for image expression, including the red, green, and blue data voltages, and the red, green, and blue subpixels located on the Nth horizontal line. The data voltage for video control, including the black data voltage, can be applied simultaneously.

During one frame, the positions of the data lines to which the data voltage for video expression and the data voltage for video control are applied are the same, but the positions of the horizontal lines may be different.

The positions of the data lines and horizontal lines to which the data voltage for image expression and the data voltage for image control are applied during one frame may be distributed regularly or irregularly.

The display panel may include first to third subpixels that share one data line.

The first to third subpixels may be separately connected to first to third scan lines that generate scan signals at different times.

The data driver may output red, green, and blue data voltages for 3/4 horizontal time and output black data voltage for the remaining 1/4 horizontal time through the first channel connected to the first data line of the display panel.

The data driving unit performs a switching operation to output red, green, and blue data voltages, and includes a first selection switch unit located between the first channel and the first data voltage output node, and a first selection switch unit that performs a switching operation to output a black data voltage. It includes a second selection switch unit located between the channel and the second data voltage output node, and the second data voltage output node may be connected to the ground line.

In another aspect, the present invention provides a method of driving a light emitting display device. The driving method of the light emitting display device includes outputting red, green, and blue data voltages for 3/4 of the horizontal time of 1 horizontal time, outputting black data voltage for the remaining 1/4 of the horizontal time of 1 horizontal time, and red , including the step of displaying an image based on green and blue data voltages and black data voltages.

The red, green, and blue data voltages are separately applied to the red, green, and blue subpixels located on the first horizontal line of the display panel, respectively, and the black data voltage is applied sequentially to the Nth horizontal line of the display panel (N is 2). or more integers) may be applied simultaneously to red, green, and blue subpixels.

The present invention divides 1 horizontal time into 1/4 and outputs red data voltage, green data voltage, blue data voltage, and black data voltage by 1/4 horizontal time, and uses a scan signal to determine the location where the black data voltage is applied. There is an effect of improving screen drag by physically separating the screen. Additionally, the present invention has the effect of providing a black data writing method that can be used even under low-frequency driving conditions. In addition, the present invention has the effect of improving the phenomenon of insufficient data voltage charging time when writing black data based on a structure in which multiple subpixels share one data line. Additionally, the present invention has the effect of providing a data voltage application method suitable for implementing a high-resolution light emitting display device.

1 is a block diagram schematically showing an organic light emitting display device according to an embodiment of the present invention.
FIG. 2 is a schematic configuration diagram of the subpixel shown in FIG. 1.
3 is an exemplary equivalent circuit diagram showing a subpixel including a compensation circuit according to an embodiment of the present invention.
4 is a diagram illustrating a display panel including subpixels including a compensation circuit according to an embodiment of the present invention.
FIG. 5 is a diagram showing a connection structure of subpixels shown in FIG. 4.
FIG. 6 is a diagram for explaining a data driver and a sensing circuit connected to the subpixels shown in FIG. 5.
7 is a first example diagram for explaining a method of applying a data voltage to subpixels including a compensation circuit according to an embodiment of the present invention.
Figure 8 is a second example diagram for explaining a method of applying a data voltage to subpixels including a compensation circuit according to an embodiment of the present invention.
FIGS. 9 to 11 are diagrams to aid understanding of the method of applying the data voltage shown in FIG. 8.
12 to 14 are exemplary diagrams showing a method of applying a data voltage for image expression and a data voltage for image control according to an embodiment of the present invention.
Figure 15 is a diagram for comparing and explaining the method of the experimental example and the method of the example.
FIG. 16 is a diagram illustrating a data driver applicable to a display panel including subpixels including a compensation circuit according to an embodiment of the present invention.
FIG. 17 is an exemplary diagram showing in detail the data output circuit portion of the data driver shown in FIG. 16.

Hereinafter, specific details for implementing the present invention will be described with reference to the attached drawings.

The light emitting display device according to the present invention can be implemented in a television, video player, personal computer (PC), home theater, automobile electric device, smartphone, etc., but is not limited thereto.

In addition, the light emitting display device described below includes an organic light emitting display device implemented based on an organic light emitting diode, as well as an inorganic light emitting display device implemented based on an inorganic light emitting diode. It can also be applied to Emitting Display Device). However, hereinafter, an organic electroluminescent display device will be described as an example.

FIG. 1 is a block diagram schematically showing an organic light emitting display device according to an embodiment of the present invention, FIG. 2 is a schematic configuration diagram of the subpixel shown in FIG. 1, and FIG. 3 is a block diagram schematically showing an organic light emitting display device according to an embodiment of the present invention. This is an example circuit illustrating a subpixel including a compensation circuit according to the present invention.

As shown in Figures 1 and 2, the organic light emitting display device according to an embodiment of the present invention includes an image supply unit 110, a timing control unit 120, a scan driver 130, a data driver 140, and a display panel. 150 and a power supply unit 180 are included.

The image supply unit 110 (or host system) outputs various driving signals in addition to image data signals supplied from the outside or image data signals stored in internal memory. The image supply unit 110 may supply data signals and various driving signals to the timing control unit 120.

The timing control unit 120 includes a gate timing control signal (GDC) for controlling the operation timing of the scan driver 130, a data timing control signal (DDC) for controlling the operation timing of the data driver 140, and various synchronization signals ( Outputs the vertical synchronization signal (Vsync) and the horizontal synchronization signal (Hsync).

The timing control unit 120 supplies the data signal DATA supplied from the image supply unit 110 along with the data timing control signal DDC to the data driver 140. The timing control unit 120 may be formed in the form of an integrated circuit (IC) and mounted on a printed circuit board, but is not limited to this.

The scan driver 130 outputs a scan signal (or scan voltage) in response to a gate timing control signal (GDC) supplied from the timing controller 120. The scan driver 130 supplies scan signals to subpixels included in the display panel 150 through scan lines GL1 to GLm. The scan driver 130 may be formed in the form of an IC or directly on the display panel 150 using a gate in panel method, but is not limited thereto.

The data driver 140 samples and latches the data signal (DATA) in response to the data timing control signal (DDC) supplied from the timing control unit 120 and converts the digital data signal into analog data based on the gamma reference voltage. Convert to voltage and output.

The data driver 140 supplies data voltage to subpixels included in the display panel 150 through the data lines DL1 to DLn. The data driver 140 may be formed in the form of an IC and mounted on the display panel 150 or on a printed circuit board, but is not limited thereto.

The power supply unit 180 generates and outputs a high-potential first power source (EVDD) and a low-potential second power source (EVSS) based on an external input voltage. The power supply unit 180 provides not only the first and second power supplies (EVDD, EVSS) but also the voltage (e.g., scan high voltage, scan low voltage) required to drive the scan driver 130 or the data driver 140. Voltages (drain voltage, half-drain voltage), etc. can be generated and output.

The display panel 150 receives a driving signal including a scan signal and a data voltage output from a driving unit including the scan driving unit 130 and a data driving unit 140, and first and second power supplies output from the power supply unit 180 ( Displays images in response to EVDD, EVSS). Subpixels of the display panel 150 directly emit light.

The display panel 150 may be manufactured based on a rigid or flexible substrate such as glass, silicon, or polyimide. And the subpixels that emit light may be composed of pixels containing red, green, and blue, or pixels containing red, green, blue, and white.

For example, one subpixel (SP) includes a pixel circuit (PC) including a switching transistor (SW), a driving transistor, a storage capacitor, and an organic light emitting diode. Subpixels (SP) used in organic light emitting displays emit light directly, so the circuit configuration is complex. In addition, there are various compensation circuits that compensate for the deterioration of not only the organic light-emitting diode that emits light, but also the driving transistor that supplies driving current to the organic light-emitting diode. Therefore, please refer to the fact that the pixel circuit (PC) included in the subpixel (SP) is shown in block form.

Meanwhile, in the above description, the timing control unit 120, scan driver 130, data driver 140, etc. were described as if they were individual components. However, depending on the implementation method of the organic light emitting display device, one or more of the timing control unit 120, scan driver 130, and data driver 140 may be integrated into one IC.

As shown in FIG. 3, a subpixel including a compensation circuit according to an embodiment of the present invention includes a switching transistor (SW), a sensing transistor (ST), a driving transistor (DT), a capacitor (CST), and an organic light emitting diode. (OLED), etc. The subpixel including the compensation circuit shown in FIG. 3 is only an example and the present invention is not limited thereto.

The switching transistor SW has a gate electrode connected to the 1A scan line GL1a, a first electrode connected to the first data line DL1, and a second electrode connected to the gate electrode of the driving transistor DT. The driving transistor (DT) has a gate electrode connected to the capacitor (CST), a first electrode connected to the first power line (EVDD), and a second electrode connected to the anode electrode of the organic light emitting diode (OLED).

The capacitor CST has a first electrode connected to the gate electrode of the driving transistor DT and a second electrode connected to the anode electrode of the organic light emitting diode (OLED). The organic light emitting diode (OLED) has an anode connected to the second electrode of the driving transistor (DT) and a cathode electrode connected to the second power line (EVSS).

The sensing transistor (ST) has a gate electrode connected to the first B scan line (GL1b), a first electrode connected to the first sensing line (VREF1), and a second electrode of the driving transistor (DT), which is a sensing node, and an organic light emitting diode ( The second electrode is connected to the anode electrode of the OLED. The sensing transistor (ST) is a compensation circuit added to sense the deterioration or threshold voltage of the driving transistor (DT) and organic light-emitting diode (OLED). The sensing transistor (ST) acquires the sensing value through the sensing node defined between the driving transistor (DT) and the organic light-emitting diode (OLED). The sensing value obtained from the sensing transistor (ST) is transmitted to an external compensation circuit provided outside the subpixel through the first sensing line (VREF1).

The 1A scan line (GL1a) connected to the gate electrode of the switching transistor (SW) and the 1B scan line (GL1b) connected to the gate electrode of the sensing transistor (ST) have a separate structure or a common structure as shown. can be taken. The gate electrode common connection structure can reduce the number of scan lines and, as a result, prevent a decrease in the aperture ratio due to the addition of a compensation circuit.

FIG. 4 is a diagram showing a display panel including subpixels including a compensation circuit according to an embodiment of the present invention, FIG. 5 is a diagram showing the connection structure of the subpixels shown in FIG. 4, and FIG. 6 is a diagram showing the connection structure of the subpixels shown in FIG. 5. This is a diagram to explain the data driver and sensing circuit connected to the subpixels shown in .

As shown in FIG. 4, the display panel 150 according to an embodiment of the present invention includes subpixels SP1 to SP3 including a compensation circuit. The subpixels SP1 to SP3 include a first subpixel SP1 emitting a first color, a second subpixel SP2 emitting a second color, and a third subpixel SP3 emitting a third color. Includes. For example, the first to third subpixels (SP1 to SP3) are arranged in one horizontal line. However, the first to third subpixels SP1 to SP3 may be arranged in different horizontal lines.

The first to third subpixels (SP1 to SP3) become one pixel. The first to third subpixels (SP1 to SP3) constituting one pixel share one data line and one sensing line, but are connected to different scan lines. Examples include the first to third subpixels SP1 to SP3 connected to the first data line DL1 and the first sensing line VREF1.

In the first to third subpixels (SP1 to SP3) that share the first data line (DL1) and the first sensing line (VREF1), the first subpixel (SP1) is connected to the first scan line (GL1) , the second subpixel SP2 is connected to the second scan line GL2 and the third subpixel SP3 is connected to the third scan line GL3. In the first to third subpixels (SP1 to SP3) that share the N-th data line (DLn) and the N-th sensing line (VREFn), the first sub-pixel (SP1) is connected to the first scan line (GL1) , the second subpixel SP2 is connected to the second scan line GL2 and the third subpixel SP3 is connected to the third scan line GL3.

The first scan line (GL1), the second scan line (GL2), and the third scan line (GL3) send distinct scan signals through the subpixels (SP1 to SP3) located on the first horizontal line (HL1). It may be defined as a scan line group (GL1 to GL3) of the applied first horizontal line (HL1). The fourth scan line (GL4), fifth scan line (GL5), and sixth scan line (GL6) located immediately below the scan line group of the first horizontal line (HL1) are located on the second horizontal line (HL2). It can be defined as a scan line group (GL4 to GL6) of a second horizontal line that applies distinct scan signals through subpixels (SP1 to SP3). As can be seen from the drawing, there are horizontal lines on the display panel 150, such as the scan line group (GL1 to GL3) of the first horizontal line (HL1) to the scan line group (GLm1 to GLm3) of the M horizontal line (HLm). There are scanlines that form each group.

In the following description, the first subpixel SP1 is defined as a red subpixel, the second subpixel SP2 is defined as a green subpixel, and the third subpixel SP3 is defined as a blue subpixel.

As shown in FIG. 5, the red subpixel (SPR), green subpixel (SPG), and blue subpixel (SPB) include a switching transistor (SW), a sensing transistor (ST), a driving transistor (DT), and a capacitor (CST). ), an organic light emitting diode (OLED), and a sensing transistor (ST), respectively.

The switching transistor SW included in the red subpixel (SPR), green subpixel (SPG), and blue subpixel (SPB) has a first electrode connected to the first data line DL1. The second electrode of the sensing transistor (ST) included in the red subpixel (SPR), green subpixel (SPG), and blue subpixel (SPB) is connected to the first sensing line (VREF1).

The switching transistor (SW) and the sensing transistor (ST) included in the red subpixel (SPR) have a common gate electrode connected to the first scan line (GL1). The switching transistor (SW) and sensing transistor (ST) included in the green subpixel (SPG) have a common gate electrode connected to the second scan line (GL2). The switching transistor (SW) and the sensing transistor (ST) included in the blue subpixel (SPB) have a common gate electrode connected to the third scan line (GL3).

As shown in FIG. 6, the red subpixel (SPR), green subpixel (SPG), and blue subpixel (SPB) share the first data line DL1 connected to the data driver 140. Additionally, the red subpixel (SPR), green subpixel (SPG), and blue subpixel (SPB) share the first sensing line (VREF1) connected to the sensing circuit unit 160.

The data driver 140 time-divides the red data voltage, green data voltage, and blue data voltage to be supplied to the red sub-pixel (SPR), green sub-pixel (SPG), and blue sub-pixel (SPB) through the first data line DL1. It can be output in this way. The sensing circuit unit 160 can sense elements included in the red subpixel (SPR), green subpixel (SPG), and blue subpixel (SPB) in a time-division manner through the first sensing line. Here, the sensing circuit unit 160 may be defined as an external compensation circuit added to sense and compensate for deterioration or threshold voltage of the driving transistor (DT) and the organic light emitting diode (OLED) through the sensing transistor (ST).

The shared structure as shown in FIG. 6 includes the number of data lines for applying data voltages to the red subpixel (SPR), green subpixel (SPG), and blue subpixel (SPB), the red subpixel (SPR), and the green subpixel (SPB). The number of sensing lines for sensing elements included in SPG) and blue subpixel (SPB) can be reduced by one-third.

The data driver 140 includes a digital-to-analog converter (DAC) that converts a digital data signal into an analog data voltage to output a data voltage through one output channel. Inside the data driver 140, the digital-to-analog converter (DAC) is a device that occupies a larger area compared to other devices and also has high power consumption. Therefore, by reducing the number of data lines, the size of the data driver 140 can be reduced and power consumption can be reduced.

The sensing circuit unit 160 includes an integrator, a voltage source, a switch circuit, a sampling circuit, etc. to sense deterioration or threshold voltage of the driving transistor (DT) and the organic light emitting diode (OLED) through one sensing channel. The integrator, voltage source, switch circuit, sampling circuit, etc. included within the sensing circuit unit 160 belong to devices that cause power consumption through linkage and interworking between many devices to perform operations required for sensing. Therefore, by reducing the number of sensing lines, the size of the sensing circuit unit 160 can be reduced and power consumption can be reduced.

In addition, devices constituting the sensing circuit unit 160 may be included in the data driver 140. Therefore, when the sensing circuit unit 160 is included in the data driver 140, both the number of data lines and the number of sensing lines can be reduced, thereby creating a synergy related to the advantages described above.

FIG. 7 is a first example diagram for explaining a method of applying a data voltage to subpixels including a compensation circuit according to an embodiment of the present invention, and FIG. 8 is a diagram showing a method of applying a data voltage to subpixels including a compensation circuit according to an embodiment of the present invention. This is a second example diagram for explaining a method of applying a data voltage to subpixels, and FIGS. 9 to 11 are diagrams to help understanding the method of applying a data voltage shown in FIG. 8.

As shown in FIGS. 5 to 7, the data driver 140 generates a red data voltage (R), a green data voltage (G), and a blue data voltage through the first data line DL1 for one horizontal time (1HT). (B) and black data voltage (BLK) are output. Here, the red data voltage (R), green data voltage (G), and blue data voltage (B) previously connected the first to third subpixels to the red subpixel (SPR), green subpixel (SPG), and blue subpixel ( Since it is defined in the order of SPB), this order is only determined, and the present invention is not limited to this. That is, it should be understood that the order of the first color data voltage, second color data voltage, and third color data voltage may be different. However, hereinafter, to facilitate understanding of the explanation, the first data voltage (Data) applied through the first data line (DL1) is red data voltage (R), green data voltage (G), blue data voltage (B), and As an example, it is configured in the order of black data voltage (BLK).

According to the above description, the data driver 140 operates a total of four red data voltages (R), green data voltages (G), blue data voltages (B), and The black data voltage (BLK) is output to the first data line (DL1). That is, the data driver 140 operates to output one data voltage every 1/4 horizontal time.

When the data voltages (R, G, B, BLK) are output in the above order, the first to third scan signals (Scan1 (R), Scan2 (G), Scan3(B)) occurs sequentially, and is the first to third scan signal (nth Scan1(R), nth Scan2(G)) applied to the scan line group of the Nth horizontal line (N is an integer greater than or equal to 2). , the nth Scan3(B)) occurs simultaneously. Here, the order of the first to third scan signals (Scan1(R), Scan2(G), and Scan3(B)) also includes the first to third subpixels as a red subpixel (SPR) and a green subpixel (SPG). and blue subpixel (SPB), so this order is only determined, and the present invention is not limited to this.

According to the above description, the scan driver 130 is connected to the first data line DL1 and uses a voltage (scan voltage) that can turn on the transistors of the first to third subpixels located in the scan line group of the first horizontal line. high voltage) is generated and output sequentially. In addition, the scan driver 130 outputs the above voltage and simultaneously turns on the transistors of the first to third subpixels connected to the first data line DL1 and located in the scan line group of the N-th horizontal line. Voltage (scan high voltage) is generated and output simultaneously.

When the data voltage is output in the same form as the embodiment and the generation time of the scan signal is controlled, the red subpixel (SPR), green subpixel (SPG), and blue subpixel located in the scan line group of the first horizontal line (SPB) is supplied with a red data voltage (R), a green data voltage (G), and a blue data voltage (B), respectively. At this time, the red subpixel (SPR), green subpixel (SPG), and blue subpixel (SPB) located in the scan line group of the first horizontal line are red data voltage (R), green data voltage (G), and blue Data voltage (B) is supplied sequentially. However, the red subpixel (SPR), green subpixel (SPG), and blue subpixel (SPB) located in the scan line group of the N-th horizontal line are commonly supplied with the black data voltage (BLK). At this time, the red subpixel (SPR), green subpixel (SPG), and blue subpixel (SPB) located in the scan line group of the N-th horizontal line are simultaneously supplied with the black data voltage (BLK).

Red sub-pixel (SPR), green sub-pixel (SPG), and blue sub-pixel (SPB) are defined as data voltages for displaying images on the display panel, but black data voltage (BLK) is the black data voltage of the display panel. It can be defined as a data voltage for video control to improve expression or screen lag (Motion Picture Response Time (MPRT)). In this way, black data insertion (BDI) is used to apply a data voltage for video control, such as black data voltage (BLK), for the purpose of improving black expression or screen drag (Motion Picture Response Time; MPRT) on the display panel. ).

As shown in FIGS. 4 to 6 and 8, the data driver 140 transmits a red data voltage (R), a green data voltage (G), and a green data voltage (G) through the first data line (DL1) for one horizontal time (1HT). The first data voltage (first Data) including the blue data voltage (B) and black data voltage (BLK) can be output. At this time, the scan driver 130 is connected to the first data line DL1 and sequentially generates first to third scan signals (first to third sub-pixels) located in the scan line group of the first horizontal line. The first Scan1(R), the first Scan2(G), and the first Scan3(B)) can be output. In addition, at the same time as the above voltage output, the scan driver 130 generates first to third sub-pixels connected to the first data line DL1 and located in the scan line group of the N-th horizontal line. The third scan signal (nth Scan1(R), nth Scan2(G), nth Scan3(B)) can be output.

Thereafter, the data driver 140 generates a red data voltage (R), a green data voltage (G), a blue data voltage (B), and a black data voltage (BLK) through the N-th data line (DLn) for one horizontal time (1HT). ) can be output. At this time, the scan driver 130 is connected to the N-th data line (DLn) and sequentially generates first to third scan signals (n) in the first to third sub-pixels located in the scan line group of the N-th horizontal line. The nth Scan1(R), nth Scan2(G), and nth Scan3(B)) can be output. In addition, at the same time as the above voltage output, the scan driver 130 generates first to third subpixels connected to the N-th data line DLn and located in the scan line group of the first horizontal line. The third scan signal (first Scan1(R), first Scan2(G), first Scan3(B)) can be output.

As can be seen from "BDI" displayed at point Pi+1 and "BDI" displayed at point Pi+2 in FIG. 8, the data voltage for video control, such as black data voltage (BLK), is determined by the position of the data line and the scan of the horizontal line. It can be written by moving the position of the line group. The embodiment outputs the data voltages (R, G, B, BLK) separately and uses a scan signal to physically separate the locations where the black data voltage (BLK) is applied to prevent screen drag even under low-frequency driving conditions. You can enter data. Hereinafter, how the data voltage for video control is sequentially written by moving the position of the data line and the position of the scan line group of the horizontal line will be described as the following flow from Figure 9 to Figure 11.

As can be seen from the data voltages for image expression (RGB Data1 to RGB Data1) and the data voltages for image control (BLK Data1 to BLK Data3) shown in Figures 9 to 11, they are applied through the same data line, but are applied by the scan signal. They are physically separated and applied to different horizontal lines. The data voltage for expressing the first image (RGB Data1) and the data voltage for controlling the first image (BLK Data1) in FIG. 9 and the data voltage for expressing the first image (RGB Data1) and the data voltage for controlling the first image in FIG. 10 (BLK Data1) ), the applied position may be changed (moved) for at least one data line and at least one horizontal line.

Figures 12 to 14 are exemplary diagrams showing a method of applying a data voltage for image expression and a data voltage for image control according to an embodiment of the present invention, and Figure 15 is a diagram for comparing and explaining the method of the experimental example and the method of the embodiment.

As shown in Figures 12 to 14, the data voltage for image expression (RGB Data) and the data voltage for image control (BLK Data) are applied in time during 1 frame of displaying an image on the display panel. is the same, but can be applied to the display panel in a spatially divided and mixed form.

As shown in FIG. 12, during one frame (1 frame), at least one of the positions of the data lines to which the data voltage for image expression (RGB Data) and the data voltage for image control (BLK Data) are applied may be the same. However, when viewed from the position of the horizontal line, at least one position at which the data voltage for image expression (RGB Data) and the data voltage for image control (BLK Data) are applied may be different. (Refer to Figure 12 where RGB and BDI are located on different lines during the same time.)

As shown in FIG. 13, during one frame (1 frame), at least one of the positions of the data lines to which the data voltage for image expression (RGB Data) and the data voltage for image control (BLK Data) are applied may be different. However, when viewed from the position of the horizontal line, at least one of the positions where the data voltage for image expression (RGB Data) and the data voltage for image control (BLK Data) are applied may be the same. (Refer to Figure 13 where RGB and BDI are located on the same line for different times.)

As shown in FIG. 14, during one frame (1 Frame), the positions of the data lines to which the data voltage for image expression (RGB Data) and the data voltage for image control (BLK Data) are applied may exist in many places the same as other places. You can. And even when viewed from the position of the horizontal line, there may be many places where the data voltage for image expression (RGB Data) and the data voltage for image control (BLK Data) are applied. That is, the data voltage for image expression (RGB Data) and the data voltage for image control (BLK Data) may be applied to a plurality of lines existing on the display panel in a regular or irregular distribution pattern. (Refer to Figure 14 where RGB and BDI appear in multiple spaces.)

Figure 15(a) shows red and green colors obtained by dividing one frame in half according to an experimental example, applying the data voltage for image expression for 1/2 frame, and applying the data voltage for image control for the remaining 1/2 frame. and a diagram showing the charging rate of the blue subpixel. And FIG. 15(b) is a diagram showing the charging rates of red, green, and blue subpixels obtained by dividing the data voltage for image expression and the data voltage for image control during one horizontal time according to an embodiment. In Figures 15(a) and 15(b), Scan is a scan signal, DTg is the voltage of the gate electrode of the driving transistor, and Vdata means the data voltage applied through the data line.

FIG. 16 is a diagram for explaining a data driver applicable to a display panel including subpixels including a compensation circuit according to an embodiment of the present invention, and FIG. 17 illustrates the data output circuit portion of the data driver shown in FIG. 16 in detail. This is an example diagram.

As shown in FIG. 16, the data driver 140 includes a data voltage output selection unit for separately outputting a data voltage for image expression (RGB Data) and a data voltage for image control (BLK Data). Referring to the first channel (CH1) of the data driver 140, the data voltage output selection unit includes a first selection switch unit (CSW1) and a second selection switch unit (CSW2).

The first selection switch unit (CSW1) has a switch electrode connected to the first selection signal line (CS1), a first electrode connected to a first data voltage output node that outputs a data voltage (RGB Data) for image expression, and a data driver unit. The second electrode is connected to the first channel (CH1) of 140. The second selection switch unit (CSW2) has a switch electrode connected to the second selection signal line (CS2), a second electrode connected to a second data voltage output node that outputs the image control data voltage (BLK Data), and a data driver ( The second electrode is connected to the first channel (CH1) of 140).

When the first selection switch unit (CSW1) is turned on by the first selection signal, the data voltage (RGB Data) for image expression is output through the first channel (CH1) of the data driver 140. On the other hand, when the second selection switch unit CSW2 is turned on by the second selection signal, the image control data voltage BLK Data is output through the first channel CH1 of the data driver 140.

The data voltage output selection unit is arranged for each channel. Therefore, the first channel (CH1) to the N-th channel (CHn) of the data driver 140 contains a data voltage (RGB Data) for image expression and an image control signal through the first data line (DL1) to the N-th data line (DLn). Data voltage output selection units are arranged to separately output data voltages (BLK Data).

As shown in Figures 16 and 17, the first electrode of the first selection switch unit (CSW1) may be connected to the output terminal of the switch block (SWB) through the first data voltage output node. And the first electrode of the second selection switch unit (CSW2) may be connected to the ground line (GND) through the second data voltage output node. Not only the first electrode of the second selection switch unit (CSW) arranged in the first channel (CH1) but also the first electrodes of the second selection switch units arranged in other channels are all connected to the ground line (GND). That is, the first electrodes of all second selection switch units (CSW) included in the data voltage output selection unit are commonly connected to the ground line (GND).

The input terminal of the switch block (SWB) includes a first converter (DAC1(R)) and a first amplifier unit (AMP1) that output a red data voltage, and a second converter (DAC2(G)) that outputs a green data voltage. A second amplifier unit (AMP2), a third conversion unit (DAC3(B)) and a third amplifier unit (AMP3) that output a blue data voltage are located.

When the first selection switch unit CSW1 is turned on, the switch block SWB performs a switching operation to sequentially output a red data voltage, a green data voltage, and a blue data voltage. As a result, the data voltage (RGB Data) for image expression prepared based on the red data voltage, green data voltage, and blue data voltage is output to the first channel (CH1) of the data driver 140.

When the second selection switch unit CSW2 is turned on, the first selection switch unit CSW1 is turned off and at the same time, the switching operation of the switch block SWB also stops. When the second selection switch unit (CSW2) is turned on, the first channel (CH1) is connected to the ground line (GND). As a result, the image control data voltage (BLK Data) prepared based on the ground voltage is output to the first channel (CH1) of the data driver 140.

Since the data voltage (RGB Data) for image expression includes red data voltage, green data voltage, and blue data voltage, 3/4 horizontal time is required to output all of them. Therefore, the first selection switch unit (CSW1) maintains the turn-on state for 3/4 horizontal time. Since the data voltage (BLK Data) for video control includes only black data voltage, 1/4 horizontal time is required to output it. Therefore, the second selection switch unit (CSW2) maintains the turn-on state for 1/4 horizontal time. When the first selection switch unit (CSW1) is turned on, the second selection switch unit (CSW2) is turned off. Conversely, when the second selection switch unit CSW2 is turned on, the first selection switch unit CSW1 is turned off.

The present invention divides 1 horizontal time into 1/4 and outputs red data voltage, green data voltage, blue data voltage, and black data voltage by 1/4 horizontal time, and the black data voltage is applied using a scan signal. There is an effect of improving screen drag by physically separating the locations. Additionally, the present invention has the effect of providing a black data writing method that can be used even under low-frequency driving conditions. In addition, the present invention has the effect of improving the phenomenon of insufficient data voltage charging time when writing black data based on a structure in which multiple subpixels share one data line. Additionally, the present invention has the effect of providing a data voltage application method suitable for implementing a high-resolution light emitting display device.

Although embodiments of the present invention have been described with reference to the accompanying drawings, the technical configuration of the present invention described above can be modified by those skilled in the art in the technical field to which the present invention belongs in other specific forms without changing the technical idea or essential features of the present invention. You will understand that it can be done. Therefore, the embodiments described above should be understood in all respects as illustrative and not restrictive. In addition, the scope of the present invention is indicated by the claims described later rather than the detailed description above. In addition, the meaning and scope of the patent claims and all changes or modified forms derived from the equivalent concept should be construed as being included in the scope of the present invention.

120: timing control unit 130: scan driver
140: data driver 150: display panel
1HT: 1 horizontal time BLK: Black data voltage
CSW1: First selection switch unit CSW2: Second selection switch unit
CS1: First selection signal line CS2: Second selection signal line
RGB Data: Data voltage for video expression
BLK Data: Data voltage for video control

Claims (11)

A display panel that displays images;
a scan driver that outputs a scan signal to the display panel; and
It includes a data driver that outputs a data voltage to the display panel,
The display panel includes red, green, and blue subpixels sharing one data line,
The red, green, and blue subpixels are separately connected to first to third scan lines that generate scan signals at different times,
The data driver outputs red, green, and blue data voltages for 3/4 horizontal time and outputs black data voltage for the remaining 1/4 horizontal time,
The red, green, and blue data voltages are separately and sequentially applied to red, green, and blue subpixels located on a first horizontal line of the display panel, respectively,
The black data voltage is applied simultaneously to red, green, and blue subpixels located on the Nth horizontal line (N is an integer greater than or equal to 2) of the display panel. delete delete According to paragraph 1,
A light emitting display device in which the data voltage for image expression including the red, green, and blue data voltages and the data voltage for image control including the black data voltage are applied during one frame in the same position, but the positions of the horizontal lines are different. According to paragraph 1,
The position of the data line and the horizontal line to which the data voltage for image expression including the red, green, and blue data voltages and the data voltage for image control including the black data voltage are applied during one frame are distributed regularly or irregularly. Light emitting display device. delete delete According to paragraph 1,
The data driver
A light emitting display device that outputs red, green and blue data voltages for 3/4 horizontal time and outputs black data voltage for the remaining 1/4 horizontal time through a first channel connected to the first data line of the display panel. According to clause 8,
The data driver
a first selection switch unit that performs a switching operation to output the red, green, and blue data voltages and is located between the first channel and the first data voltage output node;
A second selection switch unit that performs a switching operation to output the black data voltage and is located between the first channel and the second data voltage output node,
The second data voltage output node is a light emitting display device connected to a ground line. 3/4 of 1 horizontal time on a display panel including red, green, and blue sub-pixels separately connected to the first to third scan lines that share one data line and generate scan signals at different times. outputting red, green and blue data voltages during horizontal time;
outputting a black data voltage for the remaining 1/4 horizontal time of the 1 horizontal time; and
A step of displaying an image based on the red, green and blue data voltages and the black data voltage,
The red, green, and blue data voltages are separately and sequentially applied to red, green, and blue subpixels located on a first horizontal line of the display panel, respectively,
A method of driving a light emitting display device in which the black data voltage is applied simultaneously to red, green, and blue subpixels located on the Nth horizontal line (N is an integer greater than or equal to 2) of the display panel. delete

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