KR102564821B1 - Display apparatus - Google Patents

Abstract

An object of the present invention is to use a vertical blank period between a blank end signal received from an external system and the second image data stored in a controller, so that the second image data is converted to received image data received from the external system. It is to provide a display device that synchronizes.

Description

Display device {DISPLAY APPARATUS}

The present invention relates to a display device that performs a panel self refresh (hereinafter simply referred to as PSR) function to reduce power consumption when a still image is displayed for a certain period of time.

Flat Panel Displays (FPDs) are used in various types of electronic products, including mobile phones, tablet PCs, and laptop computers. Flat panel displays include Liquid Crystal Displays (LCDs), Organic Light Emitting Displays (OLEDs), and the like, and recently, Electrophoretic Displays (EPDs) are also widely used. .

Among flat panel displays (hereinafter simply referred to as 'display devices'), organic light emitting display devices have a high-speed response speed of 1 ms or less and low power consumption, so they are considered as next-generation display devices. It is getting attention.

A liquid crystal display device using a liquid crystal is also widely used.

1 is an exemplary diagram illustrating a structure of packets used in a synchronization mode between a first mode in which PSR is executed and a second mode in which PSR is not executed. In FIG. 1, (a) represents a packet transmitted from an external system to the controller, and (b) represents a packet generated by the controller.

When the external system determines that the currently output image is a still image, the external system transmits a PSR start control signal to a controller provided in the display device.

Upon receiving the control signal, the control unit stores received image data constituting the still image in a Remote Frame Buffer (RFB) (hereinafter referred to as a buffer) provided in the control unit, and then communicates with the external system. Turn off the transmission line of (TURN OFF).

In a state in which the transmission line is turned off (hereinafter referred to as the first mode), the control unit transmits the received image data (Buffer Data) stored in the buffer to a display panel using timing signals generated by the control unit itself. print out

When it is determined that a change has occurred in the currently output still image, the external system transmits a PSR end control signal (PSR_OFF) to the control unit through the transmission line.

In the first mode in which a still image is output using the PSR function, since the control unit outputs the still image using self-generated timing signals, the control unit outputs the still image from the external system after the PSR end control signal PSR_OFF. The received image data (RX Data) and the image data generated by the control unit are not synchronized. When an image is output by the received image data in a state in which the received image data and the image data are not synchronized, an abnormal image may be output.

Accordingly, the control unit, which outputs the still image using self-generated timing signals, proceeds to the synchronous mode when the PSR end control signal PSR_OFF is received. In the synchronization mode, the controller synchronizes the received image data and the image data.

As shown in FIG. 1, in the synchronous mode, the control unit stores the received image data (RX Data) in the buffer and then a blank period between the image data (RX Data') stored in the buffer. (hereinafter referred to as the third blank period) (VB3) is longer than the blank period (hereinafter referred to as the second blank period) between the received image data (Buffer Data) stored in the buffer in the first mode (hereinafter referred to as the second blank period) (VB2). increase Therefore, the driving frequency in the synchronous mode is smaller than the driving frequency in the first mode.

The third blank period VB3 may be longer than a vertical blank period (hereinafter referred to as a first blank period) between the received image data RX Data.

Through the synchronization mode, the timing at which the vertical blank period between the received image data (RX Data) finally ends and the vertical blank period between the image data (RX Data') stored in the buffer end If the timings coincide, the control unit directly converts the received image data (RX Data) received from the external system into image data without storing them in the buffer, and transmits the image data to the data driver. A mode in which such an operation is performed is referred to as a second mode. "PSR EXIT Point" shown in FIG. 1 refers to the timing at which the vertical blank period between the received image data (RX Data) ends and the vertical blank period between the image data (RX Data') stored in the buffer. Indicates the timing at which this ending timing coincides.

As described above, in the conventional display device, in the synchronous mode, after lowering the driving frequency to a preset value, the vertical blank period between the received image data (RX Data) is stored at the timing and the buffer It waits until the timing at which the vertical blank period between the image data (RX Data') ends coincides.

Therefore, the period until the timing at which the vertical blank period between the received image data (RX Data) ends coincides with the timing at which the vertical blank period between the video data (Rx Data') ends (hereinafter referred to as synchronization). The time (called Resync Time) is very long.

In addition, as shown in FIG. 1, the timing at which the vertical blank period between the received image data (RX Data) ends and the vertical blank period between the image data (RX Data') stored in the buffer are The received image data (RX Data) immediately before the ending timing coincides with each other is not output as an image.

To elaborate, the conventional display device uses a method of simply extending the vertical blank period in the synchronous mode. In this case, the period until synchronization is completed becomes long. In addition, the period until synchronization is completed may be shortened as the vertical blank period increases, but as the vertical blank period increases, the driving frequency actually used in the second mode and the driving frequency used in the synchronization mode Since the difference increases, a phenomenon such as flicker may occur. In addition, since the processes of storing data in the buffer and reading data from the buffer are repeatedly performed until synchronization is completed, power consumption increases.

An object of the present invention proposed to solve the above-mentioned problems is to use a vertical blank period between a blank end signal received from an external system and second image data stored in a control unit, so that the second image data is stored in the external system. It is to provide a display device that synchronizes with received image data received from a system.

A display device according to the present invention to solve the above problems is a display panel displaying an image, a data driver supplying data voltages to data lines provided in the display panel, and transmitting image data to the data driver. It includes a control unit that The control unit converts first image data stored in a buffer into the image data in a first mode, and converts received image data included in the image data transmitted from an external system into the image data in a second mode; In the synchronization mode between the first mode and the second mode, after storing the received image data included in the received image data transmitted from the external system as second image data in the buffer, the second image data is stored as the image data. convert to The control unit, in the synchronous mode, converts the second image data into the received image data by using a timing at which a blank end signal included in the reception packet is received and a timing at which the second image data is read from the buffer. synchronize to the When the second image data is synchronized with the received image data, the controller converts the received image data into the image data in the second mode.

According to the present invention, the period during which the second image data stored in the controller is synchronized with received image data received from an external system can be reduced.

Accordingly, the process of storing the received image data in the buffer and then reading the received image data again can be reduced, and thus power consumption can be reduced.

In addition, according to the present invention, all received image data received from the external system in the synchronous mode can be output as an image.

1 is an exemplary view showing the structure of packets used in a synchronization mode between a first mode in which PSR is executed and a second mode in which PSR is not executed;
2 is an exemplary view showing the configuration of a display device according to the present invention;
3 is an exemplary view showing the configuration of a control unit when the display device according to the present invention is driven in a first mode;
4 is an exemplary diagram showing the configuration of a control unit when a display device according to the present invention is driven in a synchronous mode;
5 is an exemplary view showing the configuration of a control unit when the display device according to the present invention is driven in a second mode;
6 is an exemplary diagram illustrating a method of synchronizing second image data with received image data when a display device according to the present invention is driven in a synchronous mode;
7 is an exemplary diagram illustrating a vertical synchronization signal and a horizontal synchronization signal applied to a display device according to the present invention;
8 is another exemplary diagram illustrating a method of synchronizing second image data with received image data when the display device according to the present invention is driven in a synchronous mode;

Advantages and features of the present invention, and methods for achieving them, will become clear with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, only the present embodiments make the disclosure of the present invention complete, and those skilled in the art in the art to which the present invention belongs It is provided to fully inform the person of the scope of the invention, and the invention is only defined by the scope of the claims.

In this specification, it should be noted that in adding reference numerals to components of each drawing, the same components have the same numbers as much as possible, even if they are displayed on different drawings.

Since the shape, size, ratio, angle, number, etc. disclosed in the drawings for explaining the embodiment of the present invention are exemplary, the present invention is not limited to the matters shown. Like reference numbers designate like elements throughout the specification. In addition, in describing the present invention, if it is determined that a detailed description of related known technologies may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. When 'includes', 'has', 'consists of', etc. mentioned in this specification is used, other parts may be added unless 'only' is used. In the case where a component is expressed in the singular, the case including the plural is included unless otherwise explicitly stated.

In interpreting the components, even if there is no separate explicit description, it is interpreted as including the error range.

In the case of a description of a positional relationship, for example, 'on top of', 'on top of', 'at the bottom of', 'next to', etc. Or, unless 'directly' is used, one or more other parts may be located between the two parts.

In the case of a description of a temporal relationship, for example, 'immediately' or 'directly' when a temporal precedence relationship is described in terms of 'after', 'following', 'next to', 'before', etc. It can also include non-continuous cases unless is used.

The term 'at least one' should be understood to include all conceivable combinations from one or more related items. For example, 'at least one of the first item, the second item, and the third item' means not only the first item, the second item, or the third item, but also two of the first item, the second item, and the third item. It means a combination of all items that can be presented from one or more.

Although first, second, etc. are used to describe various components, these components are not limited by these terms. These terms are only used to distinguish one component from another. Therefore, the first component mentioned below may also be the second component within the technical spirit of the present invention.

Each feature of the various embodiments of the present invention can be partially or entirely combined or combined with each other, technically various interlocking and driving are possible, and each embodiment can be implemented independently of each other or can be implemented together in an association relationship. may be

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is an exemplary view showing the configuration of a display device according to the present invention.

As shown in FIG. 2 , the display device according to the present invention has pixels 110 defined by gate lines GL1 to GLg and data lines DL1 to DLd and displays an image. panel 100, a data driver 300 supplying data voltages to the data lines DL1 to DLd included in the display panel 100, and the gate lines GL1 provided in the display panel 100 to GLg) and a control unit 400 that transmits image data to the data driver 300 and a gate driver 200 that sequentially supplies gate pulses.

Terms to be explained below are summarized as follows.

The Panel Self Refresh (hereinafter simply referred to as PSR) function, when a still image is displayed for a certain period of time, in order to reduce power consumption, the control unit 400 controls image data corresponding to the still image. (hereinafter, simply referred to as first image data) in a remote frame buffer (RFB) (hereinafter referred to as buffer), and then generating the image data using the first image data it means.

In the first mode, the PSR function is performed.

In the second mode, the PSR function is not performed. In the second mode, the controller 400 directly converts the received image data into the image data without storing the received image data transmitted from the external system 900 in the buffer.

In the synchronization mode, the received image data received from the external system 900 and then stored in the buffer (hereinafter simply referred to as second image data) are synchronized with the received image data received from the external system 900. do.

A received packet is a packet transmitted from the external system 900, and includes the received image data and a blank end signal.

The blank end signal indicates the timing at which the blank period between the received image data ends. The blank end signal may indicate an end timing of a vertical blank period or an end timing of a horizontal blank period. The vertical blank period exists between frames. The horizontal blank period is a period from when a data voltage is output to one horizontal line until a data voltage is output to another horizontal line.

The first image data is data stored in the buffer during the first mode.

As described above, the second image data is data received from the external system 900 in the synchronization mode and then stored in the buffer.

First, the display panel 100 includes the gate lines GL1 to GLg to which gate pulses are supplied, the data lines DL1 to DLd and the gate lines GL1 to GLg to which data voltages are supplied, and the It includes pixels 100 defined by data lines D11 to DLd.

The display panel 100 may be a liquid crystal display panel when the display device according to the present invention is a liquid crystal display device, and may be an organic light emitting display panel when the display device according to the present invention is an organic light emitting display device. may be

When the display panel 100 is the liquid crystal display panel, each pixel 110 included in the display panel 100 includes a thin film transistor used as a switching element for driving liquid crystal.

When the display panel 100 is the organic light emitting display panel, each pixel 110 provided in the display panel 100 includes an organic light emitting diode (OLED) that outputs light and the organic light emitting diode (OLED). A pixel driver for driving is provided.

Next, the data driver 300 converts the image data (Data) input from the control unit 400 into analog data voltages, and generates 1 voltage for each horizontal period in which the gate pulse is supplied to the gate line GL. Data voltages corresponding to the horizontal lines are supplied to the data lines DL1 to DLd.

Next, the gate driver 200 sequentially supplies gate pulses to the gate lines GL1 to GLg of the panel 100 in response to the gate control signal GCS input from the controller 400 . Accordingly, the thin film transistors formed in each pixel to which the gate pulse is input are turned on, and an image can be output to each pixel 110 .

The gate driver 200 is formed independently of the panel 100 and can be electrically connected to the panel 100 in various ways, but is a gate driver mounted in the non-display area of the display panel 100. It may also be configured in a Gate In Panel (GIP) method.

Finally, the controller 400 generates the gate control signal GCS for controlling the gate driver 200 and transmits it to the gate driver 200, and data for controlling the data driver 300. A control signal DCS is generated and transmitted to the data driver 300 .

The controller 400 rearranges the received image data transmitted from the external system 900 to fit the display panel 100 and transmits the rearranged digital image data to the data driver 300 .

In particular, in the first mode, the control unit 400 converts the first image data stored in the buffer into the image data Data, and then converts the image data Data into the data driver 300. send to

In the second mode, the control unit 400 converts the received image data included in the received packet transmitted from the external system 900 into the image data (Data), and then converts the image data (Data). It is transmitted to the data driver 300.

In the synchronization mode between the first mode and the second mode, the control unit 400 converts the received image data included in the received packet transmitted from the external system 900 into the buffer as second image data. After storing, the second image data is converted into the image data (Data). The controller 400 transmits the converted image data Data to the data driver 300 .

In the synchronous mode, the control unit 400 transmits the second image data to the buffer by using the timing at which the blank end signal included in the reception packet is received and the timing at which the second image data is read from the buffer. Synchronize with received image data.

When the second image data is synchronized with the received image data, the controller 400 converts the received image data into the image data (Data) in the second mode, and then converts the image data (Data). It is transmitted to the data driver 300.

A specific configuration and function of the controller 400 will be described below with reference to FIGS. 3 to 8 .

3 is an exemplary view showing the configuration of a control unit when the display device according to the present invention is driven in the first mode, and FIG. 4 is an example showing the configuration of the control unit when the display device according to the present invention is driven in the synchronous mode. 5 is an exemplary diagram showing the configuration of a control unit when the display device according to the present invention is driven in the second mode, and FIG. 6 is a second image data when the display device according to the present invention is driven in the synchronous mode. 7 is an exemplary diagram showing a method for synchronizing received image data, and FIG. 7 is an exemplary diagram showing a vertical synchronizing signal and a horizontal synchronizing signal applied to a display device according to the present invention.

The control unit 400 analyzes the timing at which the blank end signal BES is received and the timing at which the second image data Rx Data' is read from the buffer 430 in the synchronous mode, and According to the analysis result, the blank period of the second image data Rx Data' stored in the buffer 430 is varied.

By varying the blank period of the second image data (Rx Data'), the vertical blank period between the second image data (Rx Data') and the vertical blank period between the received image data (Rx Data) overlapping, the control unit 400 converts the received image data (Rx Data) into image data (Data) in the second mode, and then transfers the image data (Data) to the data driver 300. send to

In order to perform the above functions, the control unit 400 includes the buffer 430, the conversion unit 420, and the analysis unit 410, as shown in FIGS. 3 to 5 .

The buffer 430 stores the first image data in the first mode and stores the second image data Rx Data' in the synchronous mode.

After the first image data is stored in the buffer 430, it is continuously read by the conversion unit 420 during the first mode.

In the synchronous mode, received image data (Rx Data) received from the external system 900 is stored in the buffer 430 as the second image data (Rx Data'). Accordingly, the second image data Rx Data' stored in the buffer 430 during the synchronization mode is changed.

The conversion unit 420 converts the first image data transmitted from the buffer 430 into the image data in the first mode, and converts the received image data (Rx Data) into the image data in the second mode. Convert to image data (Data).

The conversion unit 420 includes a control signal generation unit for generating the gate control signal GCS and the data control signal DCS and the first image data or the received image data or the second image data. A data conversion unit may be included to convert the image data (Data) to suit the display panel 100 .

In particular, in the first mode, the conversion unit 420 may generate the image data Data using signals generated by the control signal generation unit itself.

The analyzer 410 analyzes the timing at which the blank end signal BES is received and the timing at which the second image data Rx Data' is read from the buffer 430 .

The controller 400 processes the received image data (Rx Data) or the second image data (Rx Data') in units of frames. The timing to start reading the second image data (Rx Data') from the buffer 430 means that the converter 420 transfers the first second image data (Rx Data') of a frame to the buffer 430. It means the timing to start reading from .

The analysis unit 410 may determine the timing using a gate start pulse (GSP) used in the conversion unit 420 . When the gate start pulse is transmitted to the gate driver 200, the gate pulse is supplied from the gate driver 200 to the gate line, and thus, the data voltages converted from the image data Data are the data voltages. supplied on the lines. That is, since the gate start pulse GSP is related to the output timing of the second image data Rx Data', the analyzer 410 can determine the timing using the gate start pulse. .

The analysis unit 410 transmits information about a blank period between the second image data Rx Data' generated according to the analysis result to the conversion unit 420 .

The analysis unit 410 transmits information that a vertical blank period between the second image data Rx Data' and a vertical blank period between the received image data Rx Data overlap with the conversion unit 420. send to

For example, if the received image data (Rx Data) is not received from the external system 900 and the second image data (Rx Data') is not transmitted to the conversion unit 420, the analyzer 410 ) may transmit information that the vertical blank period between the second image data (Rx Data') overlaps with the vertical blank period between the received image data (Rx Data) to the conversion unit 420 .

The analyzer 410 is driven in the synchronous mode and the second mode.

The conversion unit 420, when receiving information that the vertical blank period between the second image data (Rx Data') overlaps with the vertical blank period between the received image data (Rx Data), the first image data (Rx Data) converted to mode 2. Accordingly, the conversion unit 420 generates the image data (Data) by using the received image data (Rx Data).

To elaborate, information indicating that the vertical blank period between the second image data (Rx Data') and the vertical blank period between the received image data (Rx Data) overlap is received from the analysis unit 410. , the conversion unit 420 converts to the second mode and converts the received image data Rx Data into the image data Data.

That is, in the synchronization mode, the second image data (Rx Data') is converted into the image data (Data). However, when information that the vertical blank period overlaps is received, the conversion unit 420 converts the received image data (Rx Data) into the image data (Data).

As shown in FIG. 7 , the vertical blank period VB exists between a frame period in which one image is output and another frame period, and no image is output during the vertical blank period.

A plurality of horizontal blank periods (HB) exist in one frame period, as shown in FIG. 7 . In the horizontal period between the horizontal blank periods HB, data voltages are output to data lines included in one horizontal line. Data voltages are not output to the data lines during the horizontal blank period HB.

In the present invention, the vertical blank period (VB) of the second image data (Rx Data') may be variable, and the horizontal blank period (HB) of the second image data (Rx Data') may be variable. there is.

Hereinafter, a method of driving a display device according to the present invention will be described with reference to FIGS. 3 to 5 .

First, FIG. 3 shows components activated in the first mode among components of the control unit 400 .

As described above, the present invention utilizes the PSR function.

In the first mode, the controller 400 converts the first image data stored in the buffer into the image data Data, and then transfers the image data Data to the data driver 300. send.

Therefore, in the first mode, only the conversion unit 420 and the buffer 430 are driven, and the analysis unit 410 is not driven.

For example, if it is determined that the currently output image is a still image, the external system 900 transmits a PSR start control signal (PSR_ON) to the control unit 400, and then the control unit 400 no longer displays the still image. ) is not transmitted.

Therefore, the transmission line between the transmission unit 910 provided in the external system 900 and transmitting the received image data (Rx Data) to the analysis unit 410 and the analysis unit 410 is turned off (TURN). OFF). Accordingly, the first mode starts.

Since the analysis unit 410 no longer receives received image data from the transmission unit 910, it does not need to be driven. Since the analyzer 410 and the transmitter 910 do not communicate, power consumption can be reduced in the first mode.

In the first mode, the conversion unit 420 generates the image data Data using the first image data stored in the buffer 430 .

The first image data is data corresponding to the still image. To elaborate, the still image means an image that does not move, that is, an image that does not change. Therefore, even if the first image data corresponding to one still image is continuously output, the still image can be normally output.

Second, FIG. 4 shows components activated in the synchronous mode among the components of the control unit 400 .

In the first mode, the external system 900 continuously determines whether a currently output image is a still image.

As a result of the determination, if it is determined that there is a change in the currently output still image, the external system turns on the transmission line and transmits a PSR end control signal (PSR_OFF) to the control unit 400 through the transmission line.

In this case, the analyzer 410 receives a received packet TXDP from the transmitter 910 of the external system 900 . The received packet TXDP includes the received image data Rx Data and the blank end signal BES.

The blank end signal (BES) performs a function of notifying the output point of the received image data (Rx Data) in each frame. In this case, the blank end signal BES may be included in data representing the vertical blank period VB1 between the received image data Rx Data. Also, the blank end signal (BES) may be included in data representing the horizontal blank period (HB) included in each frame. The analyzer 410 knows that the received image data Rx Data is received after the blank end signal BES is received. For example, the analyzer 410 knows that one frame starts after the blank end signal BES is received and received image data Rx Data is received. In addition, the analyzer 410 knows that the received image data (Rx Data) to be supplied to one horizontal line included in one frame is received after the blank end signal (BES) is received.

The controller 400 controls the timing at which the blank end signal (BES) included in the reception packet is received and the timing at which the second image data (Rx Data') is read from the buffer 430 in the synchronous mode. The second image data (Rx Data') is synchronized with the received image data using .

For example, in the synchronous mode, the control unit 400 stores the timing at which the blank end signal BES included in the reception packet TXDP is received and the second image data Rx Data' in the buffer 430. ) to analyze the time interval (P) between the timing of starting to read. 4, the time interval P is shown as an interval between the timing at which the blank end signal BES is received and the timing at which the second image data Rx Data' is read from the buffer 430. there is. However, in practice, the received image data Rx Data is received immediately after the blank end signal BES is received. Therefore, substantially, the time interval P is the timing at which the received image data included in the reception packet TXDP is received and the second image data Rx Data' starting to read from the buffer 430. It can be an interval between timings. Reference numeral BDP shown in FIGS. 4 and 6 denotes a buffer data packet transmitted from the buffer 430 to the conversion unit 420 . However, the buffer data packet (BDP) shown in FIGS. 4 and 6 may actually be a packet output from the conversion unit 420 .

When the time interval P is analyzed, the analyzer 410 transmits information for varying the blank period of the second image data Rx Data' stored in the buffer 430 according to the analysis result. It is transmitted to the conversion unit 420. The conversion unit 420 varies the blank period of the second image data Rx Data' using the information. The blank period of the second image data (Rx Data') varied by the conversion unit 420 is referred to as a third blank period (VB3). The third blank period VB3 is a period in which a vertical blank period between the second image data overlaps with a vertical blank period between the received image data. The vertical blank period indicated by reference numeral VB4 in FIG. 6 due to the third blank period VB3 may overlap with the first blank period VB1. Reference numeral A shown in FIG. 6 indicates the timing between the timing at which the vertical blank period between the received image data RX Data ends and the second image data RX Data' stored in the buffer 430. Indicates the timing at which the vertical blank period ends coincide with each other. However, in the present invention, the vertical blank period between the timing at which the vertical blank period between the received image data (RX Data) ends and the second image data (RX Data') stored in the buffer 430 The timing of this end need not necessarily coincide. The third blank period is different from a blank period between the first image data (Buffer Data) (hereinafter, referred to as a second blank period (VB2)) in the first mode, and the received image data (Rx Data) ) is also different from the blank period (hereinafter, referred to as the first blank period VB1) between

When the vertical blank period between the second image data (Rx Data') overlaps with the vertical blank period between the received image data by varying the blank period of the second image data (Rx Data'), The conversion unit 420 is switched to the second mode, and in the second mode, the conversion unit 420 converts the received image data (Rx Data) into image data (Data).

To elaborate, the analyzer 410 analyzes the timing at which the blank end signal BES is received and the timing at which the second image data Rx Data' is read from the buffer 430, Information on the blank period (third blank period VB3) between the second image data generated according to the analysis result is transmitted to the conversion unit 420 . The conversion unit 420 sets the frame frequency of the image data (Data) using the third blank period.

The analysis unit 410 transmits the information to the conversion unit 420 when the vertical blank period between the second image data overlaps with the vertical blank period between the received image data.

When the information is received, the conversion unit 420 is switched to the second mode, and converts the received image data (Rx Data) into the image data (Data) in the second mode.

In the synchronization mode, only the third blank period VB3 may be used, but a blank period different from the third blank period VB3 may additionally be used. For example, the analyzer 410 may set the third blank period VB3 and another blank period such that a vertical blank period between the second image data and a vertical blank period between the received image data overlap. can be set.

In addition, in FIG. 6, after the second image data (Rx Data') corresponding to two frames are output, the vertical blank period between the second image data overlaps with the vertical blank period between the received image data. A case is shown. In this case, the third blank period VB3 is generated twice. However, after at least three or more third blank periods VB3 are generated, the vertical blank period between the second image data and the vertical blank period between the received image data may overlap.

After the second image data (Rx Data') corresponding to two frames are output, when the vertical blank period between the second image data overlaps with the vertical blank period between the received image data, the first The synchronization time (referred to as Resync Time) in which 2 image data (Rx Data') is synchronized with the received image data can be greatly shortened compared to the prior art.

In addition, after at least three or more third blank periods VB3 are generated, even if the vertical blank period between the second image data and the vertical blank period between the received image data overlap, the second image data The synchronization time (referred to as Resync Time) in which data (Rx Data') is synchronized with the received image data can be greatly shortened compared to the prior art.

In addition, in FIG. 6, the vertical blank period between the second image data (Rx Data') and the received image data by varying the vertical blank period (VB3) of the second image data (Rx Data'). Although the vertical blank period between the second image data (Rx Data') is shown overlapping, the horizontal blank period (HB) of the second image data (Rx Data') is varied, so that the gap between the second image data (Rx Data') is changed. A vertical blank period of and a vertical blank period between the received image data may overlap.

In addition, since the vertical blank period of the second image data (Rx Data') and the horizontal blank period of the second image data (Rx Data') are simultaneously varied, the gap between the second image data (Rx Data') is changed. The vertical blank period of and the vertical blank period between the received image data may overlap.

To elaborate, the analyzer 410 analyzes the timing at which the blank end signal BES is received and the timing at which the second image data Rx Data' is read from the buffer 430, According to the analysis result, information on a vertical blank period (VB) between the second image data and a horizontal blank period (HB) between the second image data may be set.

The conversion unit 420 uses at least one of information about the vertical blank period (VB) and information about the horizontal blank period (HB) transmitted from the analysis unit 410 to determine the second image data. At least one of the vertical blank period (VB) and the horizontal blank period (HB) of (Rx Data') may be changed.

In this case, the analyzer 410 considers the delay time of the received image data (Rx Data) and the delay time of the second image data (Rx Data') received from the transmitter 910, The amount of change in the vertical blank period (VB) or the amount of change in the horizontal blank period (HB) may be set.

To elaborate, the analyzer 410 calculates the amount of change in the vertical blank period (VB) or the amount of change in the horizontal blank period (HB) between the second image data (Rx Data'), The conversion unit 420 changes the vertical blank period (VB) or the horizontal blank period (HB) between the second image data (Rx Data') by using the changes. Also, the converter 420 generates the image data Data from the second image data Rx Data' using the vertical blank period VB or the horizontal blank period HB.

As described above, in the synchronous mode, the analysis unit 410, the conversion unit 420, and the buffer 430 are all driven, and the transmission unit 910 of the external system 900 is also driven.

Third, FIG. 5 shows components activated in the second mode among the components of the control unit 400 .

In the second mode, only the analyzer 410, the converter 420, and the transmitter 910 are driven, and the buffer 430 is not driven.

For example, in the second mode, the received image data (Rx Data) is transmitted from the transmitter 910 to the analyzer 410, and the analyzer 410 transmits the received image data (Rx Data). are directly transmitted to the conversion unit 420.

The conversion unit 420 converts the received image data Rx Data into the image data Data and transmits the image data Data to the data driver 300 .

The second mode is currently performed by a controller of a general display device.

As described above, in the present invention, in order to synchronize the second video data (Rx Data') with the received video data (Rx Data) received from the transmitter 910, the received packet (TXDP) The included blank end signal (BES) is used. After the blank end signal BES is received, the received image data Rx Data is received.

In this case, the timing at which the blank end signal (BES) is received corresponds to reading the second image data (Rx Data') corresponding to the first frame from the buffer 430 after the synchronization mode starts. may be the time to come. The display device according to the present invention uses a timing at which the blank end signal BES is received and an interval P between the timings to transmit the second image data Rx Data' to the received image data ( Rx Data). To this end, the analyzer 410 or the converter 420 may change at least one of a vertical blank period and a horizontal blank period of the second image data Rx Data'.

In this case, the analysis unit 410 or the conversion unit 420 may change at least one of a vertical blank period and a horizontal blank period in consideration of a delay time generated inside the control unit 400 .

The controller 400 may accurately determine the timing at which the blank end signal BES is received and the timing at which the second image data is read from the buffer. Therefore, the control unit 400 can accurately determine whether the second image data Rx Data' are synchronized with the received image data Rx Data several frames later by using the determination result.

Conventional display devices increase the probability that the second image data (Rx Data') are synchronized with the received image data (Rx Data) by simply increasing the vertical blank period, but the display device according to the present invention, Accordingly, it is possible to accurately determine the timing at which the second image data (Rx Data') are synchronized with the received image data (Rx Data).

In addition, according to the present invention as described above, the received image data (Rx Data) immediately before synchronization is not lost.

To elaborate, a conventional display device increases the vertical blank period of the second image data and drives the second image data at a driving frequency lower than that of the received image data.

However, the display device according to the present invention reduces the vertical blank period or the horizontal blank period of the second image data to drive the second image data with a driving frequency higher than that of the received image data.

8 is another exemplary diagram illustrating a method of synchronizing second image data with received image data when the display device according to the present invention is driven in a synchronous mode. In the following description, the same or similar contents to those described with reference to FIGS. 3 to 7 are omitted or briefly described.

As shown in FIG. 8, the analysis unit 410, after the first image data (Buffer Data) corresponding to one frame is output from the buffer 430, the first image corresponding to the frame If the received packet (TXDP) is received before 1/2 of the data (Buffer) is output from the buffer 430, the received image data corresponding to the second frame included in the received packet (TXDP) It is stored in the buffer 430.

For example, in the received packet TXDP shown in FIG. 8, the received image data (Rx Data) corresponding to the first frame is obtained by outputting the first image data (Buffer Data) from the buffer 430. After that, 1/2 of the first image data (Buffer) corresponding to the frame is received by the analysis unit 410 before being output from the buffer 430 .

In this case, the analysis unit 410 does not store received image data (Rx Data) corresponding to the first frame in the buffer 430 .

The analyzer 410 stores the received image data corresponding to the second frame included in the received packet TXDP in the buffer 430 .

Subsequent processes are the same as those described with reference to FIGS. 3 to 7 .

That is, the analyzer 410 determines that, after the first image data (Buffer Data) corresponding to one frame is output from the buffer 430, 1/2 of the first image data corresponding to the frame Before being output from the buffer, if the reception packet (TXDP) is received, the conversion unit ( 420).

To elaborate, in the method described with reference to FIGS. 3 to 7, the difference between the timing at which the received video data (Rx Data) is received and the timing at which the second video data is read from the buffer is one frame. It is useful when there is a difference of more than half of the received image data corresponding to .

If the difference between the timing at which the received video data (Rx Data) is received and the timing at which the second video data is read from the buffer is not more than half of the received video data corresponding to one frame, the synchronization period is increased. It can be.

Therefore, as shown in FIG. 8, the difference between the timing at which the received image data (Rx Data) is received and the timing at which the second image data (Rx Data') are read from the buffer corresponds to one frame. If there is no difference of more than half of the received image data, the analyzer 410 discards the received image data corresponding to the first frame included in the received packet TXDP and discards the received image data included in the received packet TXDP. The received image data corresponding to the second frame are stored in the buffer 430.

That is, the controller 400 determines that the difference between the timing at which the received video data (Rx Data) is received and the timing at which the second video data is read from the buffer is more than half of the received video data corresponding to one frame. If there is no difference, the received image data (Rx Data) corresponding to the first frame included in the received packet (TXDP) is discarded, and the received image data (Rx Data) corresponding to the second frame is replaced with the second image data. By storing data (Rx Data') in the buffer 430, a structure as shown in FIG. 6 can be made arbitrarily.

In the subsequent process, as described with reference to FIGS. 3 to 7 , by reducing at least one of a vertical blank period and a horizontal blank period of the second image data (Rx Data′), the second image data ( Rx Data') may be synchronized with the received image data (Rx Data).

Those skilled in the art to which the present invention pertains will understand that the present invention may be embodied in other specific forms without changing its technical spirit or essential features. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not limiting. The scope of the present invention is indicated by the following claims rather than the detailed description above, and all changes or modifications derived from the meaning and scope of the claims and equivalent concepts should be construed as being included in the scope of the present invention. do.

100: panel 110: pixel
200: gate driver 300: data driver
400: control unit

Claims (7)

a display panel on which images are displayed; a data driver supplying data voltages to data lines provided in the display panel; And a control unit for transmitting image data to the data driver,
The control unit converts first image data stored in a buffer into the image data in a first mode, and converts received image data included in a reception packet transmitted from an external system into the image data in a second mode. and, in a synchronization mode between the first mode and the second mode, after storing the received image data included in the received packet transmitted from the external system as second image data in the buffer, the second image data converting them into the image data,
The control unit, in the synchronous mode, converts the second image data into the received image data by using a timing at which a blank end signal included in the reception packet is received and a timing at which the second image data is read from the buffer. synchronizing with the
When the second image data is synchronized with the received image data, the controller converts the received image data into the image data in the second mode;
The control unit,
the buffer to store the first image data in the first mode;
a converter converting the first image data transmitted from the buffer into the image data in the first mode, and converting the received image data into the image data in the second mode; and
The timing at which the blank end signal is received and the timing at which the second image data are read from the buffer are analyzed, and information on the blank period between the second image data generated according to the analysis result is transmitted to the conversion unit. and an analyzer configured to transmit information in which a vertical blank period between the second image data and a vertical blank period between the received image data overlap to the conversion unit,
The analysis unit,
After the first image data corresponding to one frame is output from the buffer and before 1/2 of the first image data corresponding to the frame is output from the buffer, when the received packet is received, the received packet and storing in the buffer from the received image data corresponding to the second frame included in the display device. According to claim 1,
The controller analyzes the timing at which the blank end signal is received and the timing at which the second video data is read from the buffer in the synchronous mode, and the second video data stored in the buffer according to the analysis result. Varying the blank period of
When the vertical blank period between the second image data overlaps with the vertical blank period between the received image data by varying the blank period of the second image data, the control unit, in the second mode, A display device that converts the received image data into image data. delete According to claim 1,
The analysis unit,
A display device driven in the synchronous mode and the second mode. delete According to claim 1,
The analysis unit,
After the first image data corresponding to one frame is output from the buffer and before 1/2 of the first image data corresponding to the frame is output from the buffer, when the received packet is received, the received packet and transmits, to the converting unit, information for reducing a vertical blank period between the second image data, which is generated after the second image data is received. According to claim 1,
The timing of starting to read the second image data from the buffer,
A display device determined using the gate start pulse generated by the control unit.

Images