KR20180013418A - Plat Display Device and method for driving the same - Google Patents

Abstract

The present invention relates to a flat display device which can reduce power consumption by selecting one or two of R, G, and B when a clock is displayed, in a standby mode, can further increase a usage time of a battery in a mobile display device, and can display a monochrome clock of a combination of six colors in a standby mode, and to a driving method thereof. The flat display device of the present invention comprises: a display panel including a pixel array unit having a plurality of data lines and a plurality of scan lines in an active region to have sub-pixels of R, G, and B to be arranged in a matrix form, and an MUX switching unit installed outside the active region and switching the data lines for each of the sub-pixels of R, G, and B, in accordance with first to third MUX signals; and a driving unit for sequentially outputting the first to third MUX signals to the MUX switching unit at a first horizontal section (1H) of a scan signal in a general mode, and outputting one of the first to third MUX signals to only the MUX switching unit corresponding to a clock display area at the first horizontal section (1H) of the scan signal in a standby mode, or outputting two of the first to third MUX signals to only the MUX switching unit corresponding to the clock display area at the first horizontal section (1H) of the scan signal.

Description

[0001] The present invention relates to a flat display device and a method of driving the same,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat panel display, and more particularly, to a flat panel display capable of reducing the power consumption by realizing analog / digital clock display in various monochromatic colors in a standby mode in a mobile display device and a driving method thereof.

Recently, as the information age has come to a full-scale information age, a display field for visually expressing electrical information signals has been rapidly developed. In response to this, various flat panel display devices having excellent performance of thinning, light- (Flat Display Device) has been developed to replace CRT (Cathode Ray Tube).

Specific examples of such flat panel display devices include a liquid crystal display device (LCD), an organic light emitting display (OLED), an electrophoretic display (EPD) A plasma display panel (PDP), a field emission display (FED), an electroluminescence display (ELD), and an electro-wetting display (EWD) And the like.

Among them, a liquid crystal display (LCD) displays an image by controlling the light transmittance of a liquid crystal using an electric field. The liquid crystal display includes a lower substrate and an upper substrate facing each other, a liquid crystal layer ).

A transistor array for defining a plurality of pixel regions respectively corresponding to the plurality of pixels on the upper surface of the lower substrate and controlling the light transmittance of the liquid crystal layer corresponding to each of the plurality of pixel regions, A black matrix formed on the back surface of the upper substrate so as to prevent light leakage in a region corresponding to an outline of a plurality of pixel regions, a gate driving circuit for applying a gate signal and a data signal to the transistor array Gate driver integrated circuit (hereinafter referred to as "gate D-IC") and a data driver integrated circuit (hereinafter referred to as "data D-IC").

In the liquid crystal display device constructed as described above, a transistor corresponding to each pixel is selectively turned on in response to a gate signal, a pixel voltage corresponding to a data signal is applied to a pixel electrode connected to the turned-on transistor, A direction of the liquid crystal cell is changed by the electric field at this time, and the light transmittance, that is, the brightness of each pixel is adjusted to display an image.

On the other hand, an organic light emitting diode (OLED) display device is a self-luminous device that emits an organic light emitting layer by recombination of electrons and holes, has high luminance, low driving voltage, high response speed, ultra thin film, It is attracting attention as a next generation flat panel display.

Each of the plurality of subpixels constituting the OLED display device includes an OLED element composed of an anode, a cathode and an organic light emitting layer between the anode and the cathode, and a pixel circuit for independently driving the OLED element.

The pixel circuit comprises a switching thin film transistor (TFT) for supplying a data voltage to the storage capacitor to charge a voltage corresponding to the data voltage, and a current control circuit for controlling the current according to the voltage charged in the storage capacitor, A thin film transistor (TFT) that supplies a current to the OLED element, and the OLED element generates light proportional to the current.

The liquid crystal display device and the organic light emitting diode display device may be configured such that a sub-pixel of red (R), green (G), and blue (B) is composed of one unit pixel (Unit Pixel) And displays one image composed of various colors through subpixels.

Since the liquid crystal display device and the organic light emitting diode display device as described above can be made thinner, lighter, and lower in power consumption, they can be used not only for a large display device such as a television receiver, but also for a mobile display device such as a mobile phone, a smart phone, .

In such a mobile display device, it is necessary to apply a low power consumption technology to increase the use time of the battery as much as possible.

In such a mobile display device (for example, a smart phone), all the pixels of the display device are normally driven in a normal mode, such as making a call or accessing the Internet. In other standby modes, the display device is driven I never do that. However, recent mobile display devices have a function of continuously displaying an analog or digital clock or the like in a specific area of the display device in the standby mode.

A conventional driving method for continuously displaying an analog or digital clock in the standby mode will be described as follows.

FIG. 1A shows a method of sequentially applying R, G, and B image signals to a sub-pixel in a region where a conventional clock is displayed. FIG. 1B shows a method of sequentially applying R, G, and B image signals to sub- A method of simultaneously applying a video signal is shown.

As shown in FIG. 1A, when the R, G, and B image signals are sequentially driven, analog or digital clocks can be implemented in full color and gray, Are sequentially driven. Therefore, when the analog or digital clock is driven in the standby mode, the power consumption can not be reduced. Therefore, the battery use time can not be further increased in the mobile display device.

As shown in FIG. 1B, if the R, G, and B image signals are simultaneously driven, the power consumption can be reduced. However, since a mixed color is generated, a white color series of one color analog / digital clock is displayed. There are restrictions.

In order to solve such a problem, the present invention can reduce power consumption by selecting one of R, G, and B or selecting two of them when displaying an analog or digital clock in the standby mode, And more particularly, to a flat panel display capable of increasing the use time of a battery in a display device for a flat panel display and displaying a monochromatic clock in a six-color combination in a standby mode, and a driving method thereof.

According to an aspect of the present invention, there is provided a flat panel display including a pixel array unit including a plurality of data lines and a plurality of scan lines in an active area, And a mux switch provided outside the active region and switching the data lines for R, G and B subpixels according to the first to third mux signals. In the normal mode, the first to third MUX signals are sequentially output to the MUX switching unit in one horizontal period (1H) of the scan signal, and in the horizontal mode (1H) of the scan signal, Outputting only one of the first to third mux signals to the mux switching unit corresponding to the clock display region or outputting one of the first to third mux signals to the clock display region in one horizontal period (1H) And a driving unit for outputting only the corresponding mux switching unit.

Here, three data lines are connected to one output channel so that three subpixels are driven by one output channel of the driving unit, and the mux switching unit switches the subpixels according to the first through third mux signals And each data line to be connected is switched.

The driving unit includes a video signal input unit for receiving RGB video data and a control signal, a frame memory for storing RGB video data from the video signal input unit on a frame unit basis, and a control unit for receiving the control signal from the video signal input unit, A timing signal control unit for receiving the RGB image data and outputting the RGB image data, outputting the control signal, determining whether the mode is the normal mode or the standby mode, and outputting a mux control signal, A source output unit for converting the aligned RGB image data from the control unit into an analog signal and outputting three subpixel image signals through one output channel; 1 < / RTI > And outputs one of the first to third mux signals to one of the mux switches corresponding to the clock display area in one horizontal period (1H) of the scan signal in the standby mode, A mux output section that sequentially outputs two of the first to third mux signals in one horizontal period (1H) of the scan signal only to a mux switching section corresponding to the clock display region; And a gate output unit receiving a signal and sequentially outputting scan pulses to the scan lines of the display panel.

Wherein the driving unit or the mux output unit sequentially outputs two of the first to third mux signals in one horizontal period of the scan signal only to the mux switching unit corresponding to the clock display area.

According to another aspect of the present invention, there is provided a method of driving a flat panel display, including: displaying a color sub-pixel of one of R, G, and B color sub- Or only two of the R, G, and B color subpixels are driven.

In this case, only two color sub-pixels among the R, G, and B color sub-pixels corresponding to the text display area of the clock or the like are sequentially driven.

According to another aspect of the present invention, there is provided a method of driving a flat panel display including a plurality of data lines and a plurality of scan lines arranged in an active region so that R, G, and B sub-pixels are arranged in a matrix And a display panel having a display panel provided outside the active area and having a mux switching part for switching the data lines for R, G and B subpixels according to the first to third mux signals, The method according to claim 1, further comprising the step of: sequentially outputting the first to third mux signals in one horizontal period of the scan signal in the normal mode to the mux switching unit, One of the three mux signals may be output only to the mux switching unit corresponding to a text display area of a clock or the like, And two of the first to third mux signals are sequentially output only to the mux switching unit corresponding to the text display area of the clock or the like.

In this case, two of the first to third multiplex signals are sequentially output to only the mux switch corresponding to the clock display area in one horizontal period of the scan signal.

The flat panel display according to the present invention having the above-described characteristics and the driving method thereof have the following effects.

In standby mode, text such as an analog or digital clock can be displayed only in one of the R, G, and B image signals, or displayed in a combination of two colors of R, G, and B image signals, have. Therefore, the use time of the battery in the mobile display device can be further increased than in the prior art.

In the standby mode, there are six types of red (R), green (G), blue (B), yellow (Yellow, R + G), cyan Since texts such as analog or digital clocks are displayed in a single color, problems caused by color mixing can be solved.

FIG. 1A is a waveform diagram sequentially driving R, G, and B video signals to sub pixels in a region where a conventional clock is displayed
FIG. 1B is a waveform diagram for simultaneously driving R, G, and B video signals to sub pixels in a region where a conventional clock is displayed
FIG. 2 is a block diagram of a display panel of a flat panel display according to the present invention
3 is a configuration diagram of the data driver of the flat panel display according to the present invention
4 is a timing chart of the scan signal, the first to third mux signals, and the data signal in the flat panel display device of the present invention

A flat panel display device and a driving method thereof according to the present invention having the above features will be described in detail with reference to the accompanying drawings.

2 is a configuration diagram of a display panel of a flat panel display device according to the present invention.

First, the flat panel display according to the present invention can be applied to a display panel having a plurality of scan lines (gate lines) and a plurality of data lines. That is, to an OLED display device and a liquid crystal display device.

The display panel of the flat panel display according to the present invention is an LTPS display panel for a mobile phone. As shown in FIG. 2, the display panel includes a plurality of data output channels D1, D2, D3, D4,. G, and B sub-pixels arranged in a matrix form and having scan lines (gate lines, S1, S2, S3, S4, S5, S6, A mux switching unit 20 provided outside the active region and switching each data line for R, G and B subpixels according to first through third mux signals Mux1, Mux2 and Mux3; And a COG unit 30 in which a driving unit is mounted with a mux terminal Pand1 and a data output channel terminal Pad2 for applying signals.

Here, the three R, G, and B subpixels constitute one unit pixel, and one output channel is connected to the unit pixel. That is, three data lines are connected to one output channel such that three sub-pixels (R, G, B) are driven by one output channel, and the mux switching unit 20 is connected to each sub- And to switch each data line to be turned on.

Accordingly, the first through third multiplex signals Mux1, Mux2, and Mux3 can be sequentially output in one horizontal period (1H) of the scan signal.

3 is a configuration diagram of a driving unit of the flat panel display according to the present invention.

The driving unit of the flat panel display according to the present invention is a COG type.

As shown in FIG. 3, the driving unit of the flat panel display according to the present invention includes RGB video data and various control signals (V-Sync, H-Sync, GSP (Gate Start Pulse), GSC A video signal input unit 1 for receiving a gate shift clock (GO), a gate output enable (GOE), a source start pulse (SSP), a source shift clock (SSC) A frame memory 2 for storing RGB image data from a video signal input unit 1 on a frame unit basis and a control unit 3 for receiving the various control signals from the video signal input unit 1 and outputting source control signals V- SSP, SSC, SOE or POL) to the source output unit 4, receives the RGB image data from the frame memory 2, aligns the RGB image data, and outputs the RGB image data to the source output unit 4, Outputs the gate control signals GSP, GSC, and GOE to the gate output unit 6, A timing signal control unit 3 for determining whether the mode control signal is in the idle mode and outputting a mux control signal to the mux output unit 5 from the timing signal control unit 3, , SSP, SSC, SOE or POL) and the aligned RGB image data, and converts the RGB image data into an analog signal using a gamma reference voltage in response to the source control signal, A source output section 4 for outputting a video signal to each of the data output channels D1, D2, D3, D4, ... of the timing signal control section 3 and a MUX control signal from the timing signal control section 3 A mux output section 5 for outputting the first to third mux signals Mux1, Mux2 and Mux3 to the mux switching section 20 of the display panel 7 explained in Fig. 2, (Sync or CLK signal) from the control unit 3 and outputs the control signal And a gate output unit 6 for sequentially outputting scan pulses to the respective scan lines S1, S2, S3, S4, S5, S6, ... of the display panel 7 described in FIG.

Here, the mux output unit 5 is connected to the mux terminal Pand1 of FIG. 2, and the source output unit 4 is connected to the data output channel terminals Pad2 of FIG.

The timing signal controller 3 controls the first through third multiplex signals Mux1, Mux2 and Mux3 to be sequentially outputted in the horizontal period 1H of the scan signal 1 in the normal mode, One or two of the first to third multiplex signals Mux1, Mux2, and Mux3 are sequentially output in one horizontal period 1H.

In the standby mode, the timing signal controller 3 may control the first to third mux signals Mux1, Mux2, and Mux3 to be output simultaneously in the horizontal period 1H of the scan signal 1, Do. The reason is that conventionally, both R, G, and B image signals are simultaneously driven, resulting in color mixing. However, since only two of the R, G, and B image signals are simultaneously driven, the possibility of causing color mixing is low to be.

4 is a timing chart of the scan signal GATE, the first through third multiplex signals MUX1, MUX2, and MUX3, and the data signal SOURCE in the flat panel display device of the present invention.

As shown in FIG. 4A, in the normal mode, the first to third mux signals Mux1, Mux2 are applied to one horizontal section 1H of the scan signals G (n), G (n + 1) Mux2, and Mux3) are sequentially output to apply R, G, and B image signals to the respective subpixels through the data lines.

As shown in FIG. 4B, in the standby mode, the first to third mux signals Mux1 and Mux2 are applied to one horizontal period 1H of the scan signals G (n), G (n + 1) and G (n + Only one of the R, G, and B image signals is applied to the pixels corresponding to the clock display region through the data line.

In FIG. 4B, in one horizontal period (1H) of the scan signals G (n), G (n + 1) and G (n + 2) so that the R video signal is applied only to the R sub- Only the first mux signal MUX1 is output.

However, the present invention is not limited to this, and one horizontal interval of the scan signals G (n), G (n + 1), and G (n + 2) may be set so that the G video signal is applied only to the G sub- (N), G (n + 1), and G (n + 1) so that the B video signal is applied only to the B subpixels corresponding to the clock display region, only the third mux signal MUX3 can be outputted in one horizontal period 1H of the horizontal scanning period (n + 2).

4C, in the standby mode, the first to third mux signals ((n + 1), (n + 1) Mux1, Mux2, and Mux3) are sequentially output to apply only two video signals of the R, G, and B video signals to the pixels corresponding to the clock display region through the data lines.

In FIG. 4C, the horizontal and vertical directions of the scan signals G (n), G (n + 1) and G (n + 2) are set so that the R and B video signals are applied only to the R and B sub- And the first and third multiplex signals Mux1 and Mux3 are sequentially output in the period 1H.

(N), G (n + 1), and G (n + 2) so that the R and G video signals are applied only to the R and G subpixels corresponding to the clock display region, The first and second multiplex signals Mux1 and Mux2 can be sequentially output in one horizontal period 1H of the clock display region and the B and G video signals can be sequentially outputted to the B and G subpixels corresponding to the clock display region It is possible to sequentially output the second and third multiplex signals Mux1 and Mux2 to one horizontal section 1H of the signals G (n), G (n + 1) and G (n + 2).

4C, the first and third mux signals Mux1 and Mux3 may be simultaneously output, the first and second mux signals Mux1 and Mux2 may be simultaneously output, (Mux1, Mux2) at the same time.

Of course, as in the prior art, the present invention can sequentially output the first to third mux signals Mux1, Mux2, and Mux3 in the standby mode.

As described above, in the flat panel display device and the driving method thereof according to the present invention, in the standby mode, one of R, G, and B is selected or sub-pixels corresponding to the clock display region are sequentially selected It is possible to reduce power consumption and display a monochrome clock of a combination of six colors. If one of the R, G and B is selected, it can be displayed as red (R), green (G) or blue (B) G), cyan (G + B), magenta (R + B), and the like are displayed. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents. Will be clear to those who have knowledge of.

1: video signal input unit 2: frame memory
3: Timing signal control unit 4: Source output unit
5: Mux output section 6: Gate output section

Claims (8)

A pixel array unit including a plurality of data lines and a plurality of scan lines arranged in an active area and arranged in a matrix form of R, G, and B sub-pixels; A display panel having a MUX switching unit for switching the data lines for R, G, and B subpixels; And
The first to third mux signals are sequentially output to the mux switching unit in one horizontal period of the scan signal in the normal mode and one of the first to third mux signals To the mux switching unit corresponding to the clock display area or to output only two of the first to third mux signals to the mux switching unit corresponding to the clock display area in one horizontal period of the scan signal And the flat panel display device. The method according to claim 1,
Three data lines are connected to one output channel so that three subpixels are driven by one output channel of the driving unit, and the mux switching unit is connected to each subpixel according to the first through third mux signals And each data line is switched. The method according to claim 1,
The driving unit includes:
A video signal input unit for receiving RGB video data and a control signal,
A frame memory for storing RGB image data from the image signal input unit on a frame basis,
Receives the control signal from the image signal input unit, receives the RGB image data from the frame memory, and outputs the RGB image data, outputs the control signal, and determines whether the image data is in the normal mode or the standby mode A timing signal control unit for outputting a mux control signal,
A source output unit for converting the aligned RGB image data from the timing signal controller into an analog signal and outputting three subpixel image signals through one output channel,
The first to third mux signals are sequentially output to the mux switching unit in one horizontal period of the scan signal in the normal mode according to the mux control signal of the timing signal controller, One of the first to third mux signals may be output only to the mux switch corresponding to the clock display area or two of the first to third mux signals may be output to the clock display area in one horizontal period of the scan signal A mux output unit for outputting only the corresponding mux switching unit,
And a gate output unit receiving the control signal of the timing signal control unit and sequentially outputting scan pulses to the respective scan lines of the display panel. The method according to claim 1 or 3,
Wherein the driving unit or the mux output unit sequentially outputs two of the first to third mux signals in one horizontal period of the scan signal only to the mux switching unit corresponding to the clock display area. In the standby mode, only one of the R, G, and B color subpixels corresponding to the text display area of the clock or the like is driven, or only one of the R, G, and B color subpixels corresponding to the text display area of the clock, The driving method of the flat panel display device comprising: 6. The method of claim 5,
Wherein only two of the R, G, and B color subpixels corresponding to the text display region of the clock are sequentially driven. A pixel array unit including a plurality of data lines and a plurality of scan lines arranged in an active area and arranged in a matrix form of R, G, and B sub-pixels; A method of driving a flat display device having a display panel having a mux switching unit for switching the data lines for R, G, and B subpixels,
The first to third mux signals are sequentially output to the mux switching unit in one horizontal period of the scan signal in the normal mode and one of the first to third mux signals To the mux switching unit corresponding to the clock display area or to output two of the first to third mux signals to the mux switching unit corresponding to the clock display area in one horizontal period of the scan signal, . 8. The method of claim 7,
And sequentially outputs two of the first to third mux signals to only one of the mux switches corresponding to the clock display area in one horizontal period of the scan signal.

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