KR101446342B1 - Display device - Google Patents

Abstract

The present invention provides a display device including a display unit including three or more subpixels emitting different colors, a scan driver for supplying a scan signal to the subpixels, a data driver for supplying a data signal to the subpixels, Wherein the data driver sequentially supplies the data signals to the subpixels connected to the one output unit during one frame, and the data driver sequentially supplies the data signals to the subpixels connected to the one output unit during one frame, The scan driver supplies a scan signal to the subpixels after a data signal is supplied to at least one subpixel.

Display device, data signal, time division driving

Description

Display device

1 is a schematic plan view of a display device according to a first embodiment of the present invention;

2 is a diagram illustrating an example of a circuit configuration of a switch portion located between a data driver and sub-pixels.

3 is a driving waveform diagram according to the first embodiment of the present invention;

FIG. 4 is a diagram illustrating an example of a circuit configuration of a switch unit located between a data driver and sub-pixels according to a modified embodiment of the first embodiment; FIG.

5 is a schematic plan view of a display device according to a second embodiment of the present invention;

6 is a diagram illustrating an example of a circuit configuration of a switch portion located between a data driver and sub-pixels.

7 is a driving waveform diagram according to a second embodiment of the present invention;

FIG. 8 is a diagram illustrating an example of a circuit configuration of a switch unit located between a data driver and sub-pixels according to a modified embodiment of the second embodiment; FIG.

DESCRIPTION OF THE REFERENCE NUMERALS

110, 210: substrate 120, 220:

130, 230: display portion 140, 240:

150a, 250a: Data driver 150b, 250b:

160, 260: Switch part 170, 270: Circuit board

The present invention relates to a display device and a driving method thereof.

Among the display devices, liquid crystal display devices and organic light emitting display devices are attracting attention because of their low power consumption and excellent resolution.

When a signal is supplied to a display unit including a plurality of subpixels arranged in a matrix, a transistor, a capacitor, and a light emitting unit, which are located inside the subpixel, So that the image can be displayed.

Here, the display device uses a scan driver and a data driver to select a plurality of subpixels disposed on the display unit and supply data signals to the selected subpixels.

Accordingly, in order to supply a large amount of data signals stored in the memory to each sub-pixel, a data driver is driven to supply a data signal to each signal line, and a data driver for writing data signals to selected sub- Was used.

In such a driving method, since the data signal is supplied to the subpixels connected to one data line, it takes a certain time to display the video image corresponding to the data signal, or a part of the data signal, Resulting in mixing or interfering with the data signal to be supplied in the next order, resulting in a problem of deteriorating display quality.

An object of the present invention to solve the above-mentioned problems is to provide a display device capable of improving display quality.

According to an aspect of the present invention, there is provided a display device including a display unit including three or more subpixels emitting different colors, a scan driver for supplying a scan signal to the subpixels, And a plurality of switch units positioned between the data driver and one output of the data driver and between the two or more subpixels, wherein the data driver sequentially applies, during one frame, the subpixels connected to the one output unit The scan driver supplies a scan signal to the subpixels after a data signal is supplied to at least one subpixel.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the embodiments of the present invention, a display device is exemplified by an organic light emitting display device.

≪ Embodiment 1 >

1 is a schematic plan view of a display device according to a first embodiment of the present invention.

1, a display device according to a first embodiment of the present invention includes unit pixels 120 including three or more sub-pixels 120R, 120G, and 120B that emit light of different colors on a substrate 110, (120) are arranged in a matrix form.

Although the unit pixels 120 are shown to include red, green, and blue subpixels 120R, 120G, and 120B, respectively, the unit pixels 120 may include other colors.

Here, the three or more subpixels 120R, 120G, and 120B may include one or more transistors, capacitors, and light emitting diodes, though they are not shown.

The light emitting diodes included in the organic light emitting diode include an organic light emitting diode in which the light emitting layer is formed of an organic material, but may be formed of an inorganic light emitting diode formed of an inorganic material.

In the present invention, an organic light emitting diode in which a light emitting layer of an organic light emitting diode is formed of an organic material is described as an example, and a hole injecting layer (HIL), a hole transporting layer (HTL), an electron transporting layer (ETL) EIL), and the like. In addition, a buffer layer (BL) for controlling the balance of electrons or electrons may be further added.

And the transistor for driving the light emitting diode may be selected as one of an N-type or P-type MOS transistor. For reference, the circuit connection relationship and the driving waveform of each of the sub pixels 120R, 120G, and 120B may be different depending on the type of the transistor.

On the other hand, the unit pixels 120 are supplied with a driving signal through a driving device connected to the signal lines 140.

The driving device includes a data driver 150a for supplying a data signal to the unit pixels 120. [ And a scan driver 150b for supplying a scan signal to the unit pixels 120. [ A power supply unit 150c supplies power to at least one of the unit pixels 120, the data driver 150a, and the scan driver 150b. The control unit 150d supplies a control signal to at least one of the data driver 150a, the scan driver 150b, the power supply unit 150c, and the switch unit 160.

The data driver 150a and the scan driver 150b may be separately arranged on the outer substrate 110 of the display unit 130 as well as the data driver 150a and the scan driver 150b may be connected to the external device, The driver 150b may be disposed and electrically connected to the substrate 110. [

However, this is merely an example, and the data driver 150a and the scan driver 150b can be flexibly arranged according to the design scheme.

For example, the power supply unit 150c and the control unit 150d may be located on a PCB (Printed Circuit Board) such as a circuit board 170 provided outside, but are not limited thereto.

For example, the electrical connection between the substrate 110 and the circuit board 170 may be electrically connected by a flexible cable (e.g., FPC) 165, etc., wherein the flexible cable 165 is mounted on the substrate 110 And supplies a driving signal to the unit pixel 120 through the data driver 150a and the scan driver 150b disposed on the substrate 110. [

The display device according to the first embodiment of the present invention includes a switch unit 160 positioned between one output terminal of the data driver 150a and two or more subpixels, Divisionally controls the data driver 160 to supply the data signal.

Accordingly, the data signal output from the output terminal of the data driver 150a is supplied to three or more subpixels 120R, 120G, and 120B included in the unit pixel 120 by the time division switching operation of the switch unit 160 .

Accordingly, the data driver 150a may further include a line buffer for separately storing and outputting each data signal (e.g., Data R, Data B, and Data G).

Here, the output terminal of the switch unit 160 can be designed to correspond to the number of the unit pixels 120 or the number of the sub pixels 120R, 120G, and 120B. Accordingly, the output terminal of the switch unit 160 may be formed of one selected from two, three, or four.

Such a switch unit 160 may be located inside the data driver 150a, but it is preferable for the switch unit 160 to be located on the substrate 110 between the data driver 150a and the display unit 130, ) Can be reduced.

Hereinafter, the circuit configuration according to the number of output stages of the switch unit and the number of sub-pixels will be described in more detail with reference to the drawings.

FIG. 2 is a diagram illustrating a circuit configuration of a switch portion located between a data driver and sub-pixels. FIG.

In FIG. 2, the switch unit is composed of a de-multiplexer, but this is a part of the embodiment, and it can be configured as a switch as in the "Z1" area. However, in the case of a demultiplexer, the signal line for supplying the control signal is "S" 1 while the signal line for supplying the control signal is S1, S2, S3 As shown in FIG.

Referring to FIG. 2, the switch unit 160 shown in FIG. 1 includes one input terminal for receiving a data signal from one output terminal ch1 of the data driver 150a and three sub pixels R1, G1, B1 And a demultiplexer DM1 having three output terminals for outputting a data signal to the data output terminal.

The plurality of demultiplexers DM1 to DMn are arranged in units of one pixel per unit pixel P1 to Pn including three sub-pixels R1, G1, B1 to Rn, Gn and Bn, .

When the plurality of demultiplexers DM1 to DMn are driven, the data signals output from the plurality of output terminals ch1 to chn of the data driver 150a are supplied to the respective unit pixels P1 Gn, Bn included in the sub-pixels Rn, ..., Pn, respectively.

Here, the plurality of demultiplexers DM1 to DMn are switched by the control signal supplied to the signal line S, and the control signal supplied to the signal line S is supplied to the control unit 150d . For reference, the control unit 150d allows data signals output from one output terminal ch1 of the data driver 150a to be supplied to three or more sub-pixels R1, G1, and B1 without overlapping each other .

The scan driver 150b receives the data signals from the scan driver 150b and the scan driver 150b in response to the first and second data signals of the demultiplexers DM1 to DMn. When the data signal is supplied to the second output terminal and the data signal is supplied to the third output terminal, the scan signals are supplied to the respective sub-pixels R1, G1, and B1.

Hereinafter, a driving method will be described with reference to FIG.

3 is a driving waveform diagram according to the first embodiment of the present invention.

The driving waveforms shown in FIG. 3 correspond to the scan signals Scan supplied to the three sub-pixels R1, G1 and B1 by the switching operation of the demultiplexers DM1 to DMn shown in FIG. 2, (S_01, S10, S11) and data signals (Data R, Data G, Data B).

The data signals Data R, Data G and Data B are supplied to the three sub-pixels R 1, G 1 and B 1 and the scan signals Scan when the data signals Data R, Data G and Data B are supplied to the three sub- As shown in FIG.

Referring to FIGS. 2 and 3, a data driver (not shown) connected to a display unit having a unit pixel P1 including three or more sub-pixels R1, G1, and B1 emitting different colors, (Data R, Data G, and Data B).

And supplies the control signal to the demultiplexers DM1 to DMn, which are switch units located between one output terminal of the data driver and the three sub-pixels R1, G1, and B1. It is noted that the control signals S_01, S_10, and S_11 are supplied to the signal line S of the demultiplexers DM1 to DMn, which are the switch units.

Accordingly, the data driver sequentially supplies the data signals Data R, Data G, and Data B to the three sub-pixels R 1, G 1, and B 1 connected to one output terminal of the data driver during one frame. That is, they are supplied in a time-sharing manner.

Then, the scan driver connected to the display unit is driven to supply a scan signal Scan to the subpixels, and at least one data signal is supplied, and then a scan signal Scan is supplied.

For example, the data signal (Data R, Data G, Data B) supplied last to three sub-pixels (R1, G1, B1) in one frame (1 frame) The scan signal Scan may be supplied during the period of the data B shown in FIG.

Here, the section of the data signal to be finally supplied is "Data B ", but this is merely a part of the embodiment.

On the other hand, when the control signals S_01, S_10 and S_11 are supplied to the demultiplexers DM1 to DMn, which are switch units, the scan signals Scan are supplied to the subpixels R1, G1, The data signals Data R, Data G and Data B output from the output terminal of the data driver are supplied to the sub-pixels R 1, G 1 and B 1, respectively.

In the control signal supply step, when the data signals Data R, Data G and Data B are supplied to the three sub-pixels R 1, G 1 and B 1, respectively, And supplies a control signal to the demultiplexers DM1 to DMn, which are the switch units, so as not to overlap each other.

Here, at least two periods of the subpixels to which the respective data signals are applied may have different sizes.

That is, the period during which the data signal is applied last during the period in which the data signal is applied (Data B), that is, during the period during which the data signal is applied, may be larger than the period during which the other data signal is applied. Lastly, the size of the section in which the data signal is applied may be 1.5 to 2.5 times the size of the section in which the other data signal is applied.

The size of the interval in which each data signal (Data R, Data G, and Data B) is applied can be determined so that the data signal can be sufficiently supplied to the sub-pixels connected to the data line. The data signal Data R supplied to the sub-pixels for the first time in one frame due to the time division can be sufficiently supplied to the data lines because there is a certain time interval until the scan signal scan is applied. On the other hand, in the case of the blue data signal (Data B), since the data signal is simultaneously applied to the scan signal (scan), the data signal is supplied to the subpixels connected to the data line. .

Lastly, the size of the interval in which the data signal is applied may be 1.2 to 2.5 times the size of the interval in which the other data signal is applied. Lastly, when the size of the section in which the data signal is applied is 1.2 times or more the size of the section in which the other data signal is applied, the last data signal can be sufficiently supplied to the data line. It is possible to secure the time for supplying the data to the data line.

3, the scan signal Scan and the control signals S_01, S_10, and S_11 supplied to the sub-pixels R1, G1, and B1 are set to a predetermined time difference As shown in FIG.

First, when looking at point A1, it can be seen that the two data signals (Data R, Data G) do not overlap with each other by setting the switching time of the demultiplexers DM1.

This means that the time difference can be set within the range where the data signals do not overlap each other. However, the time difference between the two data signals (Data G, Data B) supplied between points A1 and A2 may not be as shown.

When the last data signal (Data B) is supplied, the scan signal (Scan) is shifted by ± tt from the start point and the end point of the last data signal (Data B) .

This takes into account the time point at which the scan signal Scan is supplied to each of the sub-pixels R1, G1 and B1 and the signal is rising up or falling down.

FIG. 4 is a diagram illustrating a circuit configuration of a switch unit positioned between a data driver and sub-pixels according to a modified embodiment of the first embodiment.

In FIG. 4, the above-described switch unit is composed of a de-multiplexer, but this can be configured as a switch as in the "Z2" area only as a part of the embodiment. However, in the case of the demultiplexer, the signal line for supplying the control signal is "S" 1 while the signal line for supplying the control signal in the case of the switch like the "Z2" Can be two.

Referring to FIG. 4, the demultiplexers DM1 to DMn, which are the switch units, are designed to have two output terminals, and a data signal output from the data driver 150a is supplied to each of the three sub-pixels R1, G1 and B1 .

5 is a driving waveform diagram according to a modified embodiment of the first embodiment.

In the modified embodiment, the scan driver supplies the data signals to the first output terminals of the demultiplexers DM1 to DMn and the data signals to the second output terminals to the sub-pixels R1, G1, and B1 Thereby supplying a scan signal.

When one of the output terminals of the demultiplexers DM1 to DMn is two, one of the three sub-pixels R1, G1 and B1 is connected to the switching unit located at n + 1 or n-1 The data signal will be supplied by the data signal.

5, the scan signal Scan and the control signals S_0 and S_1 supplied to the sub-pixels R1, G1 and B1 are set to a predetermined period of time as described in the first embodiment, Please refer to the fact that the car may be supplied with the car.

If the data signal output from the data driver is supplied to each of the subpixels in accordance with the last supplied data signal as in the first embodiment of the present invention, It is possible to solve the problem.

≪ Embodiment 2 >

6 is a schematic plan view of a display device according to a second embodiment of the present invention.

6, the display device according to the second embodiment of the present invention includes unit pixels 220 including four or more sub-pixels 220R, 220G, 220B, and 220W emitting different colors, A display unit 230 arranged in a matrix form on the display unit 210 is formed.

Although the unit pixels 220 are shown as including red, green, blue and white subpixels 220R, 220G, 220B and 220W respectively, the unit pixels 220 may emit other colors have.

Here, the four or more subpixels 220R, 220G, 220B, and 220W may include one or more transistors, capacitors, and light emitting diodes, though they are not shown.

The light emitting diodes included in the organic light emitting diode include an organic light emitting diode in which the light emitting layer is formed of an organic material, but may be formed of an inorganic light emitting diode formed of an inorganic material.

In the present invention, an organic light emitting diode in which a light emitting layer of an organic light emitting diode is formed of an organic material is described as an example, and a hole injecting layer (HIL), a hole transporting layer (HTL), an electron transporting layer (ETL) EIL), and the like. In addition, a buffer layer (BL) for controlling the balance of electrons or electrons may be further added.

And the transistor for driving the light emitting diode may be selected as one of an N-type or P-type MOS transistor. For reference, the circuit connection relationship and the driving waveform of each of the sub pixels 220R, 220G, 220B, and 220W may be different depending on the type of the transistor.

The unit pixels 220 are supplied with a driving signal through a driving unit connected to the signal lines 240.

The driving device includes a data driver 250a that supplies a data signal to the unit pixels 220. [ And a scan driver 250b for supplying a scan signal to the unit pixels 220. [ The power supply unit 250c supplies power to at least one of the unit pixels 220, the data driver 250a, and the scan driver 250b. The control unit 250d also supplies a control signal to at least one of the data driver 250a, the scan driver 250b, the power supply unit 250c, and the switch unit 260.

The data driver 250a and the scan driver 250b may be separately arranged on the outer substrate 210 of the display unit 230 as well as the data driver 250a and the scan driver 250b may be connected to the external device, The driver 250b may be disposed and electrically connected to the substrate 210. [

However, this is merely an example, and the data driver 250a and the scan driver 250b can be flexibly arranged according to the design scheme.

For reference, the power supply unit 250c and the control unit 250d may be located on a PCB (Printed Circuit Board) such as a circuit board 270 provided outside, but are not limited thereto.

For reference, the electrical connection between the substrate 210 and the circuit board 270 may be electrically connected by a flexible cable (e.g., FPC) 265 or the like, wherein the flexible cable 265 is mounted on the substrate 210 And supplies a driving signal to the unit pixel 220 through the data driver 250a and the scan driver 250b disposed on the substrate 210. [

Meanwhile, the display device according to the second embodiment of the present invention places the switch unit 260 between one output terminal of the data driver 250a and two or more subpixels, (260).

The data signal output from the output terminal of the data driver 250a is divided into four or more subpixels 220R, 220G, 220B, and 220W included in the unit pixel 220 by the time- Respectively.

Accordingly, the data driver 250a may further include a line buffer for separately storing and outputting each data signal (e.g., Data R, Data B, Data G, and Data W).

Here, the output terminal of the switch unit 260 can be designed to correspond to the number of the subpixels 220R, 220G, 220B, and 220W included in the unit pixels 220. [ Accordingly, the output terminal of the switch unit 260 may be formed of one selected from two, three, or four.

Such a switch unit 260 may be located inside the data driver 250a, but it is preferable for the switch 260 to be located on the substrate 210 between the data driver 250a and the display unit 230, ) Can be reduced.

Hereinafter, the circuit configuration according to the number of output stages of the switch unit and the number of sub-pixels will be described in more detail with reference to the drawings.

FIG. 7 is a diagram illustrating an example of a circuit configuration of a switch portion located between a data driver and sub-pixels. FIG.

6, the switch unit 260 shown in FIG. 6 includes one input terminal for receiving a data signal from one output terminal ch1 of the data driver 250a and four input terminals for receiving four data signals (R1, G1, B1 And a demultiplexer DM1 having four output terminals for outputting data signals to the data lines W1 and W1.

The plurality of demultiplexers DM1 to DMn includes unit pixels P1 to Pn including four sub-pixels R1, G1, B1, W1 to Rn, Gn, Bn and Wn, One for each.

When the plurality of demultiplexers DM1 to DMn are driven, the data signals output from the plurality of output terminals ch1 to chn formed in the data driver 250a are supplied to the respective unit pixels R1, G1, B1, W1 ... Rn, Gn, Bn, Wn included in the subfields P1 to Pn.

Here, the plurality of demultiplexers DM1 to DMn are switched by the control signal supplied to the signal line S. [ The control signal is supplied from the control unit 250d in Fig.

Here, the control unit 250d controls the data driver 250a so that the data signals output from one output terminal ch1 of the data driver 250a are supplied to the four sub-pixels R1, G1, B1, and W1, And supplies the control signal S to the demultiplexers DM1 to DMn of the demultiplexers DM1 to DMn.

FIG. 8 is a diagram illustrating a circuit configuration of a switch unit located between a data driver and sub-pixels according to a modified embodiment of the second embodiment.

Referring to FIG. 8, the demultiplexers DM1 to DMn, which are the switch units, are designed to have two output terminals, and the data signal output from the data driver 250a of FIG. 6 is divided into four sub- B1, and W1, respectively.

When two output terminals of the demultiplexers DM1 to DMn as the switch units are two, two of the four sub-pixels R1, G1, B1 and W1 are connected to the switch unit located at n + 1 or n-1 The data signal will be supplied by switching.

As described above, according to the second embodiment of the present invention, when a data signal is supplied to each of the subpixels, and the data signal is supplied from the data driver, It is possible to solve the problem.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood that the invention may be practiced. It is therefore to be understood that the embodiments described above are to be considered in all respects only as illustrative and not restrictive. In addition, the scope of the present invention is indicated by the following claims rather than the detailed description. Also, all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

As described above, the present invention has the effect of providing a display device capable of improving display quality.

Claims (15)

A display unit including three or more subpixels emitting different colors; A scan driver for supplying a scan signal to the sub-pixels; A data driver for supplying a data signal to the sub-pixels; And And a plurality of switch units positioned between one output of the data driver and two or more subpixels, The data driver sequentially supplies data signals to the subpixels connected to the one output unit during one frame. The scan driver supplies the scan signals to the subpixels after the data signals are supplied to at least one subpixel, Lt; / RTI > At least two periods of the subpixels to which the respective data signals are applied have different sizes of the subpixels, A period during which the data signal is last applied in the period during which the data signal is applied is larger than a period during which the other data signal is applied, Wherein the scan signal is applied within a period in which the data signal is last applied. The method according to claim 1, And a control unit connected to the switch unit to supply a control signal, Wherein the control unit supplies a control signal to the switch unit during one frame so that the data signal output from the output terminal of the data driver is sequentially supplied to the sub-pixels. delete delete delete The method according to claim 1, And the size of the section where the last data signal is applied is 1.5 to 2.5 times larger than the size of the section in which the other data signal is applied. The method according to claim 1, The switch unit has an input terminal connected to one output terminal of the data driver and an output terminal connected to two, three or four sub pixels. The apparatus according to claim 1, And a demultiplexer having one input terminal for receiving the data signal from one output terminal of the data driver and two or more output terminals for outputting the data signal to two or more subpixels. The method according to claim 1, When there are two output terminals of the switch unit, Wherein the scan driver supplies the scan signal to the subpixels when the data signal is supplied to the first output terminal of the switch unit and the data signal is supplied to the second output terminal. The method according to claim 1, When there are three output terminals of the switch unit, Wherein the scan driver supplies the scan signals to the subpixels when the data signal is supplied to the first and second output terminals of the switch unit and the data signal is supplied to the third output terminal. The method according to claim 1, When there are four output terminals of the switch unit, Wherein the scan driver supplies the scan signals to the subpixels when the data signal is supplied to the first, second, and third output terminals of the switch unit and the data signal is supplied to the fourth output terminal. 10. The method of claim 9, When there are four output terminals of the switch unit, Wherein the display unit includes four subpixels emitting different colors. The apparatus according to claim 1, And is located on the substrate which is located inside the data driver or between the data driver and the display. The method according to claim 1, Wherein the subpixels include red, green, and blue when the subpixels are three, and the subpixels include red, green, blue, and white when the subpixels are four. The method according to claim 1, The sub- Each comprising at least one transistor, a capacitor, and an organic light emitting diode.

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