KR20230094691A - Data driving apparatus, method of controlling the data driving apparatus, and display apparatus - Google Patents

Abstract

The embodiment of the present invention relates to a data driving device, a control method of the data driving device, and a display device. The present invention provides a technology which can reduce the number of connectors when a data processing device transmits a signal based on a dedicated protocol to a plurality of data driving devices. The data driving device includes: a receiving buffer which receives image data transmitted from the data processing device during a first time period; and a control circuit unit which controls not to receive the image data from the data processing device, after a first time period has elapsed, during a second time period in which the adjacent data driving device receives the image data from the data processing device through a first line.

Description

Data driving device, control method of data driving device, and display device

The present embodiment relates to a data driving device, a control method of the data driving device, and a display device.

As informatization progresses, various display devices capable of visualizing information are being developed. A liquid crystal display (LCD), an organic light emitting diode (OLED) display device, a plasma display panel (PDP) display device, and the like are display devices that have been developed or are being developed until recently. These display devices are evolving to properly display high-resolution images.

Meanwhile, there may be several methods for driving a display panel on which LEDs are disposed, and representative examples include a PAM (Pulse Amplitude Modulation) method and a PWM (Pulse Width Modulation) method. The PAM method is a method of supplying an analog voltage corresponding to a gradation value of a pixel to a pixel and differently controlling the magnitude of current flowing to the pixel according to the analog voltage. The PWM method is a method of adjusting the time of the current supplied to the pixel according to the gradation value of the pixel.

As an example, a display panel includes a plurality of pixels, and the light emitting diode (eg, LED) included in each pixel emits light according to a current flowing through the light emitting diode, so that a desired image can be displayed.

The display device converts image data input to a data processing device (or data processing circuit) (eg, a controller or timing controller (T-CON)) into appropriate format data (eg, RGB) in order to display a desired image through the display panel. data) and transferred to a data driving circuit (or data driving device) (eg, a source driver IC (SD-IC)).

The data driving circuit (or data driving device) may supply a data voltage for driving each pixel included in the display panel to each pixel based on the image data received from the data processing device (eg, timing controller). .

The data processing device (eg, timing controller) is a signal based on a dedicated protocol (eg, a clock embedded data signal (CEDS) or a clock embedded differential signal) with a plurality of data driving circuits (or data driving devices). An embedded differential signal (CEDS)) may be transmitted. The data processing device may provide high-speed data transmission by being connected to a plurality of data driving circuits in a point-to-point (P2P) method to transmit signals based on the dedicated protocol. Meanwhile, as the number of data driving circuits connected to the data processing device increases, the number of connectors for connection with the data driving circuits connected in the P2P manner increases.

Against this background, an object of the present embodiment is, in one aspect, a controller (eg, a timing controller or a data processing device) to a plurality of data driving circuits (or data driving devices) and a signal (eg, clock embedded data) based on a dedicated protocol. An object of the present invention is to provide a data driving device capable of reducing the number of connectors when transmitting a clock embedded data signal (CEDS), a control method of the data driving device, and a display device.

In order to achieve the above object, in one aspect, the present embodiment provides an image transmitted from a data processing device during a first time interval through a first communication line connected to the data processing device by sharing with an adjacent data driving device. a receive buffer for receiving data; and receiving the image data from the data processing device during a second time interval in which the adjacent data driving device receives the image data from the data processing device through the first line after the first time interval has elapsed. It provides a data driving device comprising a; control circuit unit for controlling not to do so.

In another aspect, the present embodiment includes receiving image data transmitted from the data processing device during a first time interval in a reception buffer through a first communication line shared with an adjacent data driving device and connected to the data processing device. ; and receiving the image data from the data processing device during a second time interval in which the adjacent data driving device receives the image data from the data processing device through the first line after the first time interval has elapsed. It provides a control method of a data driving device, including; controlling not to do so.

In another aspect, the present embodiment provides a data processing device for generating and transmitting image data; a first data driving device receiving the image data from the data processing device during a first time interval through a first communication line connected to the data processing device; and is connected to the data processing device by sharing the first communication line with the first data driving device, and the data processing device is connected to the data processing device during a second time interval through the first communication line shared with the first data driving device. and a second data driving device receiving the image data from the first data driving device, wherein the second data driving device receives the image data from the data processing device through the first line. Provided is a display device that controls not to receive the image data from the data processing device through the first communication line during a 2-time interval.

As described above, according to the present embodiment, a data processing device (eg, a timing controller or a data processing circuit) uses a plurality of data driving circuits (or data driving devices) to signal (eg, a clock embedded data signal) based on a dedicated protocol. When transmitting a clock embedded data signal (CEDS), the number of connectors can be reduced by time-dividing and sharing a communication line between adjacent data driving circuits.

For example, by reducing the number of connectors in a display device, a slim printed circuit board (PCB) can be implemented and manufacturing costs of the set can be reduced.

1 is a configuration diagram of a display device according to an exemplary embodiment.
2 is a diagram illustrating a connection relationship of display devices according to an exemplary embodiment.
3 is a diagram illustrating a connection relationship of display devices according to an exemplary embodiment.
4 is a diagram illustrating a connection relationship of display devices according to an exemplary embodiment.
5 is a diagram illustrating a CEDS signal according to an exemplary embodiment.
6 is a diagram illustrating a configuration of a data driving device according to an exemplary embodiment.
7 is a diagram illustrating a configuration of a data driving device according to an exemplary embodiment.

1 is a configuration diagram of a display device according to an exemplary embodiment.

Referring to FIG. 1 , a display device 100 may include a display panel 110, a data driving device 120, a gate driving device 130, and a data processing device 140. The data driving device 120 may be referred to as a data driving circuit or a source driver IC (SD-IC). The data processing device 140 may be referred to as a data processing circuit or a controller (eg, a timing controller (T-CON)).

A plurality of data lines DL and a plurality of gate lines GL may be disposed on the display panel 110, and a plurality of pixels (P) may be disposed. A pixel may be composed of a plurality of sub-pixels (SPs). Here, the sub-pixels may be R (red), G (green), B (blue), W (white), and the like. One pixel may be composed of RGB sub-pixels SP, RGBG sub-pixels SP, or RGBW sub-pixels SP. Hereinafter, for convenience of description, it will be described that one pixel is composed of RGB sub-pixels.

The data driving device 120 , the gate driving device 130 , and the data processing device 140 are devices that generate signals for displaying an image on the display panel 110 .

The gate driving device 130 may supply a gate driving signal of a turn-on voltage or a turn-off voltage to the gate line GL. When the gate driving signal of the turn-on voltage is supplied to the sub-pixel SP, the sub-pixel SP is connected to the data line DL. Further, when the gate driving signal of the turn-off voltage is supplied to the sub-pixel SP, the connection between the sub-pixel SP and the data line DL is disconnected. The gate driving device 130 may be referred to as a gate driver.

The data driving device 120 may supply the data voltage Vp to the sub-pixel SP through the data line DL. The data voltage Vp supplied to the data line DL may be supplied to the subpixel SP according to the gate driving signal.

The data driving device 120 may include at least one integrated circuit (IC), and the at least one integrated circuit may be a tape automated bonding (TAB) type or a chip on glass (COG: The chip on glass type may be connected to a bonding pad of the panel 110 or may be directly formed on the panel 110 or may be integrated and formed on the panel 110 according to embodiments. Also, the data driving device 120 may be implemented as a chip on film (COF) type.

The data processing device 140 may supply control signals to the gate driving device 130 and the data driving device 120 . For example, the data processing device 140 may transmit a gate control signal (GCS) for starting a scan to the gate driving device 130 . Also, the data processing device 140 may output image data to the data driving device 120 . Also, the data processing device 140 may transmit a data control signal that controls the data driving device 120 to supply the data voltage Vp to each sub-pixel SP.

The data processing device 140 may transmit image data and data control signals through the first communication line LN1 using a protocol signal (PS) in which a preset clock (or clock training data) is embedded. . For example, a signal transmitted from the data processing device 140 to the data driving device 120 through the first communication line LN1 may be a signal having a clock embedded differential signal or clock embedded data signal (CEDS) format. , This is an example, and embodiments to be described later are not limited to the format. For example, as shown in FIG. 5, the CEDS 500 includes a clock signal CLK (eg, clock training data), image data RGB (eg, red/white/blue/green (RWBG)) data), and a control packet (CP) for various controls. The clock signal (CLK), image data (RGB), and control packet (CP) included in the CEDS may be alternately transmitted according to a set order.

The data driving device 120 may transmit the training state of the clock embedded in the protocol signal PS (eg, CEDS) to the data processing device 140 through the second communication line LN2.

The data processing device 140 and the data driving device 120 may perform high-speed data communication using the first communication line LN1 based on the CEDS communication protocol. The data processing device 140 includes various setting data of the data driving device 120 required for high-speed data communication in a control packet CP and transmits it to the data driving device 120 through the first communication line LN1. can For example, the setting data of the data driving device 120 may include a basic gain level of an equalizer included in the data driving device 120, scramble information, line polarity information, and the like. Here, the scramble information may include information on whether data is transmitted as it is or scrambled when data is transmitted from the data processing device 140 to the data driving device 120, and the line polarity information is the first pixel of the pixel. It may include information indicating the polarity of the line.

The data processing device 140 may transmit signals for optimizing high-speed data communication to the data driving device 120 through the first communication line LN1. For example, the data processing device 140 may transmit a tuning signal for the equalizer of the data driving device 120, and the data driving device 120 optimally tunes the gain of the equalizer using the tuning signal. can do.

The data driving device 120 may feed back information, signals, or data related to the state of the data driving device 120 to the data processing device 140 through the second communication line LN2 . The data driving device 120 transmits a clock training state for high-speed data communication of the CEDS protocol signal transmitted through the first communication line LN1 to the data processing device 140 through the second communication line LN2. can give feedback. The feedback signal for the clock training state for the high-speed data communication transmitted from the data driving device 120 to the data processing device 140 through the second communication line LN2 will be referred to as a lock signal. However, embodiments to be described later are not limited to the above terms. For example, the data driving device 120 may transmit the lock signal to the data processing device 140 through the second communication line LN2. The data driving device 120 may feed back the reception state of the signal through the first communication line LN1 through the second communication line LN2. For example, the data driving device 120 may feedback a reception state of specific information transmitted through a CEDS protocol signal through the second communication line LN2. Here, the data driving device 120 generates state data for the reception state, includes the state data in an auxiliary communication signal through the second communication line LN2, and transmits the state data to the data processing device 140 (or feedback). can do.

In one embodiment, the first communication line (LN1) through which the CEDS protocol signal (PS) is transmitted and received may be an AC differential signal line, and the second communication line (LN2) through which the feedback signal is transmitted and received is TTL (transistor -transistor line) or a single communication line consisting of an open drain circuit.

The data processing device 140 and the data driving device 120 may perform one-to-one communication through the first communication line LN1 and cascade communication in a chain form (eg, daisy chain) through the second communication line LN2. (daisy chain communication) can be performed.

For example, when a plurality of data driving devices 120 are configured, at least one of the plurality of data driving devices drives data while the second communication line LN2 is connected in a cascade form between adjacent data driving devices. The device may be connected to the data processing device 140 through the second communication line LN2.

Hereinafter, an example of the first communication line LN1 and the second communication line LN2 connected between the data processing device 140 and the plurality of data driving devices 120 will be described with reference to FIG. 2 . do.

2 is a diagram illustrating a connection relationship of display devices according to an exemplary embodiment. Referring to FIG. 2 , the display device 200 may include at least one data processing device 140 and a plurality of data driving devices 120a, 120b, 120c, 120d, 120e, and 120f. 2, six data driving devices (eg, a first data driving device 120a, a second data driving device 120b, a third data driving device 120c, a fourth data driving device 120d, Although 5 data driving devices 120e and 6 data driving devices 120f are shown connected to one data processing device 140, the number of data driving devices connected to the data processing device 140 does not no limits. According to an embodiment, in FIG. 2 , the first data driving device 120a, the second data driving device 120b, the third data driving device 120c, and the fourth data driving device 120d drive fifth data. Although the device 120e and the sixth data driving device 120f are connected to a different second PCB (PCB2), this is illustrative only and is not limited to the drawing of FIG. 2 .

The data processing device 140 may be disposed on a first PCB (PCB1, printed circuit board). Also, the data processing device 140 may be connected to the plurality of data driving devices 120a, 120b, 120c, 120d, 120e, and 120f through the first communication line LN1 and the second communication line LN2. For example, the first communication line LN1 may be connected to the plurality of data driving devices 120a, 120b, 120c, 120d, 120e, and 120f via a first PCB (PCB1) and a second PCB (PCB2). The first PCB (PCB1) and the second PCB (PCB2) may be connected by a first film (FL1) made of a flexible material, and the first communication line (LN1) and the second communication line (LN2) may be connected to the first film (FL1). It may extend from the first PCB (PCB1) to the second PCB (PCB2) through FL1.

Each of the data driving devices 120a, 120b, 120c, 120d, 120e, and 120f may be disposed on the second film FL2 in the form of a chip-on-film (COF). The second film FL2 may be a support substrate made of a flexible material that connects the second PCB (PCB2) and the display panel 110, and the first communication line LN1 and the second communication line LN2 are formed by the second film FL2. It may extend from the second PCB (PCB2) through FL2 to each of the data driving devices 120a, 120b, 120c, 120d, 120e, and 120f.

According to an embodiment, the first communication line LN1 may be connected one-to-one between the data processing device 140 and each of the data driving devices 120a, 120b, 120c, 120d, 120e, and 120f. A one-to-one connection between the data processing device 140 and each of the data driving devices 120a, 120b, 120c, 120d, 120e, and 120f may be referred to as a point to point (P2P) connection, but is not limited thereto.

The second communication line LN2 does not overlap with the first communication line LN1 on a plane and is connected between the data driving devices 120a, 120b, 120c, 120d, 120e, and 120f, or a specific data driving device ( For example, the fourth data driving device 120d or the fifth data driving device 120e may be connected between the data processing device 140. For example, the first data driving device 120a may be connected to the second data driving device 120a. It may be connected to the second data driving device 120b through the communication line LN2, and the second data driving device 120b may be connected to the third data driving device 120c through the second communication line LN2. The third data driving device 120c is connected to the fourth data driving device 120d through the second communication line LN2, and the fourth data driving device 120d processes data through the second communication line LN2. Device 140 may be connected.

As shown in FIG. 2, since the data processing device 140 and each of the data driving devices 120a, 120b, 120c, 120d, 120e, and 120f are connected one-to-one through the first communication line LN1, the As the number of data driving devices 120 connected to the data processing device 140 increases, the communication line passing through the first PCB (PCB1), the first film (FL1), or the second PCP (PCB2) The number of or the number of connectors may increase. For example, when one data processing device 140 transmits a signal based on the CEDS communication protocol to 24 data driving devices 120, according to the method of FIG. 2, 24 first communication lines LN1 are connected. can Each of the first communication lines LN1 may include two lines to transmit differential signals based on the CEDS communication protocol. Assuming that the display device 200 requires a transmission rate of 1.5 Gbps to provide an image of 60 Hz having UHD (Ultra High Definition) resolution, the data processing device 140 is configured to perform each data driving device 120 The 1.5 Gbps signal may be transmitted through each first communication line (LN1) connected one-to-one with.

In embodiments described later, when the data processing device 140 transmits a signal based on a dedicated protocol (eg, a clock embedded data signal (CEDS)) to the plurality of data driving devices 120, adjacent data Embodiments in which the number of connectors can be reduced by time-dividing and sharing a communication line between driving circuits will be described.

3 is a diagram illustrating a connection relationship of display devices according to an exemplary embodiment. Referring to FIG. 3 , the display device 300 may include at least one data processing device 140 and a plurality of data driving devices 120a, 120b, 120c, 120d, 120e, and 120f. 3, six data driving devices (eg, a first data driving device 120a, a second data driving device 120b, a third data driving device 120c, a fourth data driving device 120d, Although 5 data driving devices 120e and 6 data driving devices 120f are shown connected to one data processing device 140, the number of data driving devices connected to the data processing device 140 does not no limits. According to an embodiment, in FIG. 3 , the first data driving device 120a, the second data driving device 120b, the third data driving device 120c, and the fourth data driving device 120d drive fifth data. Device 120e and sixth data driving device 120f) are connected to a different second PCB (PCB2), but this is illustrative only and is not limited to the drawing of FIG. 3 .

The data processing device 140 may be disposed on a first PCB (PCB1, printed circuit board). Also, the data processing device 140 may be connected to the plurality of data driving devices 120a, 120b, 120c, 120d, 120e, and 120f through the first communication line LN1 and the second communication line LN2. For example, the first communication line LN1 may be connected to the plurality of data driving devices 120a, 120b, 120c, 120d, 120e, and 120f via a first PCB (PCB1) and a second PCB (PCB2). The first PCB (PCB1) and the second PCB (PCB2) may be connected by a first film (FL1) made of a flexible material, and the first communication line (LN1) and the second communication line (LN2) may be connected to the first film (FL1). It may extend from the first PCB (PCB1) to the second PCB (PCB2) through FL1.

Each of the data driving devices 120a, 120b, 120c, 120d, 120e, and 120f may be disposed on the second film FL2 in the form of a chip-on-film (COF). The second film FL2 may be a support substrate made of a flexible material that connects the second PCB (PCB2) and the display panel 110, and the first communication line LN1 and the second communication line LN2 are formed by the second film FL2. It may extend from the second PCB (PCB2) through FL2 to each of the data driving devices 120a, 120b, 120c, 120d, 120e, and 120f.

According to an embodiment, unlike shown in FIG. 2 , the first communication line LN1 is between the data processing device 140 and the plurality of data driving devices 120a, 120b, 120c, 120d, 120e, and 120f. It is not connected one-to-one, but can be partially shared and connected. According to an embodiment, the first data driving device 120a and the second data driving device 120b may be connected to the data processing device 140 by sharing the same first communication line LN1. For example, the data processing device 140 may be connected in parallel to the first data driving device 120a and the second data driving device 120b through the first communication line LN1. Similarly, the third data driving device 120c and the fourth data driving device 120d may be connected to the data processing device 140 by sharing the same first communication line LN1. For example, the data processing device 140 may be connected in parallel to the third data driving device 120c and the fourth data driving device 120d through the first communication line LN1. The fifth data driving device 120e and the sixth data driving device 120f may be connected to the data processing device 140 by sharing the same first communication line LN1. For example, the data processing device 140 may be connected in parallel to the fifth data driving device 120e and the sixth data driving device 120f through the first communication line LN1. Although FIG. 3 illustrates that the same first communication line LN1 is shared and used by two data driving devices, it may be modified and applied to be shared and used by three or more data driving devices.

According to an embodiment, the data processing device 140 transmits image data (eg, a CEDS protocol signal including the image data) during the first time period through the first communication line LN1 to the first data driving device ( 120a), the third data driving device 120c, and the sixth data driving device 120f. After the first time interval elapses, the data processing device 140 transmits image data (eg, a CEDS protocol signal including the image data) through each of the first communication lines LN1 during the second time interval. It can be transmitted to the second data driving device 120b, the fourth data driving device 120d, and the fifth data driving device 120e.

As shown in FIG. 3, two data driving devices 120 share and use one first communication line LN1, so that the data processing device 140 and the plurality of data driving devices 120 are connected. The number of connected first communication lines LN1 or the number of connectors may be reduced. For example, when one data processing device 140 transmits a signal based on the CEDS communication protocol to 24 data driving devices 120, according to the method of FIG. 3, 12 first communication lines LN1 are connected. can Each of the first communication lines LN1 may include two lines to transmit differential signals based on the CEDS communication protocol. Assuming that the display device 300 requires a transmission rate of 1.5 Gbps to provide a 60 Hz image with UHD resolution, the data processing device 140 is connected to each data driving device 120. A signal of 3.0 Gbps can be transmitted through one communication line (LN1).

According to one embodiment, the connection relationship between the data processing device 120 and the data driving devices 120 shown in FIG. 3 may be referred to as a P2P-based multi-drop connection, but in the above term It is not limited.

According to an embodiment, as the data processing device 140 is connected to the plurality of data driving devices 120 through a common first communication line LN1, the first communication line LN1 is branched. Mis-matching of impedance at the point may occur. The impedance mismatching may cause an error in a signal (eg, a CEDS communication protocol signal) transmitted from the data processing device 140 to the data driving device 120 .

In an embodiment to be described later, when the plurality of data driving devices 120 share and use a common first communication line LN1, a method for reducing data errors due to impedance mismatching will be described. .

As described above, when the data processing device 140 transmits image data (eg, CEDS communication protocol signal) through the first communication line LN1 commonly connected to the plurality of data driving devices 120, one second It can be time-divided and transmitted as many times as the number of data driving devices connected through one communication line (LN1). In this case, during the time interval in which the specific data driving device receives image data through the first communication line LN1, other data driving devices (eg, adjacent data driving devices) sharing the first communication line LN1 may It is possible to control not to receive video data.

For example, referring to FIG. 3 , when image data is transmitted from the data processing device 140 to the first data driving device 120a through the first communication line LN1 during the first time interval, the An adjacent data driving device (eg, second data driving device 120b) sharing the same first communication line LN1 as the first data driving device 120a may be controlled not to receive the image data. Similarly, when image data is transmitted from the data processing device 140 to the third data driving device 120c through the first communication line LN1 during the first time interval, the third data driving device ( An adjacent data driving device (eg, the fourth data driving device 120d) sharing the same first communication line LN1 as 120c) may be controlled not to receive the image data. During the first time interval, when image data is transmitted from the data processing device 140 to the sixth data driving device 120f through the first communication line LN1, the sixth data driving device 120f and An adjacent data driving device (eg, the fifth data driving device 120e) sharing the same first communication line LN1 may be controlled not to receive the image data. A method of controlling not to receive the image data may be implemented in various ways, and specific embodiments will be described later in the description of FIGS. 6 and 7 .

According to an embodiment, after the lapse of the first time period, during the second time period, the image data is transferred from the data processing device 140 to the second data driving device 120b through the first communication line LN1. , an adjacent data driving device (eg, first data driving device 120a) sharing the same first communication line LN1 as the second data driving device 120b does not receive the image data. You can control not to. Similarly, when image data is transmitted from the data processing device 140 to the fourth data driving device 120d through the first communication line LN1 during the second time interval, the fourth data driving device ( 120d) and an adjacent data driving device (eg, the third data driving device 120c) sharing the same first communication line LN1 may be controlled not to receive the image data. When image data is transmitted from the data processing device 140 to the fifth data driving device 120e through the first communication line LN1 during the second time interval, the fifth data driving device 120e An adjacent data driving device (eg, the sixth data driving device 120f) sharing the same first communication line LN1 may be controlled not to receive the image data.

According to an embodiment, when the first time interval elapses and the first data driving device 120a ends or stops receiving image data through the first communication line LN1, the first data driving device 120a 120a is a signal indicating not to receive the image data from the data processing device 140 through the second communication line LN2 connected to the second data driving device 120b, or the reception of the image data A signal indicating termination or interruption may be transmitted to the second data driving device 120b. Hereinafter, for convenience of description, a signal transmitted from the first data driving device 120a to the second data driving device 120b will be referred to as a lock signal, but the term is not limited thereto. The second data driving device 120b receives a lock signal from the first data driving device 120a through the second communication line LN2, and receives the lock signal from the data processing device 140 during a second time interval. Image data may be received through the first communication line LN1.

Similarly, when the first time period elapses and the third data driving device 120c ends or stops receiving image data through the first communication line LN1, the third data driving device 120c A signal indicating that the image data is not received from the data processing device 140 through the second communication line LN2 connected to the fourth data driving device 120d or that the reception of the image data is terminated or stopped. An indicating signal may be transmitted to the fourth data driving device 120d. The fourth data driving device 120d receives a lock signal from the third data driving device 120c through the second communication line LN2, and receives the lock signal from the data processing device 140 during a second time period. Image data may be received through the first communication line LN1. Similarly, when the first time period elapses and the sixth data driving device 120f ends or stops receiving image data through the first communication line LN1, the sixth data driving device 120f A signal indicating not to receive the image data from the data processing device 140 through the second communication line LN2 connected to the fifth data driving device 120e or indicating that the reception of the image data is terminated or stopped. An indicating signal may be transmitted to the fifth data driving device 120e. The fifth data driving device 120e receives a lock signal from the sixth data driving device 120f through the second communication line LN2, and receives the lock signal from the data processing device 140 during a second time interval. Image data may be received through the first communication line LN1.

4 is a diagram illustrating a connection relationship of display devices according to an exemplary embodiment. Referring to FIG. 4 , the display device 400 may include at least one data processing device 140 and a plurality of data driving devices 120a, 120b, 120c, 120d, 120e, and 120f. can 4, six data driving devices (eg, a first data driving device 120a, a second data driving device 120b, a third data driving device 120c, a fourth data driving device 120d, Although 5 data driving devices 120e and 6 data driving devices 120f are shown connected to one data processing device 140, the number of data driving devices connected to the data processing device 140 does not no limits. According to an embodiment, in FIG. 4 , the first data driving device 120a, the second data driving device 120b, the third data driving device 120c, and the fourth data driving device 120d drive fifth data. Device 120e and sixth data driving device 120f) are connected to a different second PCB (PCB2), but this is illustrative only and is not limited to the drawing of FIG. 4 .

According to an embodiment, referring to FIG. 4, when compared to FIG. 3, the fourth data driving device 120d may be connected to a second PCB (PCB2) separated from the fifth data driving device 120e, but , The fourth data driving device 120d may be connected to the fifth data driving device 120e through a second communication line LN2. For example, the second communication line LN2 connected between the fourth data driving device 120d and the fifth data driving device 120e includes a second PCB (PCB2), a first film (FL1) and a first PCB. The fourth data driving device 120d and the fifth data driving device 120e may be connected via PCB1.

5 is a diagram illustrating a CEDS signal according to an exemplary embodiment. Referring to FIG. 5 , as described above, according to an embodiment, a signal transmitted from the data processing device 140 to each data driving device 120 through the first communication line LN1 is a clock embedded differential (CEDS) signal. The signal 500 may have a signal or clock embedded data signal format, but this is exemplary, and the above-described embodiments or embodiments to be described later are not limited to the protocol format. For example, the CEDS includes a clock signal (CLK) (eg clock training data), image data (RGB) (eg RWBG (red/white/blue/green) data), control packets for various controls (control packet; CP) may be included. The clock signal (CLK), image data (RGB), and control packet (CP) included in the CEDS may be alternately transmitted according to a set order.

6 is a diagram illustrating a configuration of a data driving device according to an exemplary embodiment. Referring to FIG. 6 , each data driving device 120 (eg, a first data driving device 120a, a second data driving device 120b, a third data driving device 120c, and a fourth data driving device 120d) ), the fifth data driving device 120e and the sixth data driving device 120f) may include a clock data recovery (CDR) circuit 600 .

According to one embodiment, the CDR circuit 600 may include a receive buffer 610, a control circuit 620, and a data recovery circuit 630. The reception buffer 610 may receive a CEDS communication protocol signal (eg, the CEDS signal shown in FIG. 5) transmitted from the data processing device 140 through the first communication line LN1. The CEDS communication protocol signal received in the reception buffer 610 may be transmitted to the control circuit 620 and the data recovery circuit 630 .

The control circuit unit 620 may check a clock training signal from the CEDS communication protocol signal received from the reception buffer 610 and provide the clock signal CLK to the data recovery circuit 630 . The data recovery circuit 630 receives the CEDS communication protocol signal from the receiving buffer 610, and data (e.g., video data) can be restored. Image data restored by the data restoration circuit 630 may be used to control light emission of each pixel (or subpixel) of the display panel 110 .

According to an embodiment, as described above, during the first time period, the CEDS communication protocol signal including image data is transferred from the data processing device 140 to the data driving device 120 through the first communication line LN1. When transmitting, the CEDS communication protocol signal may be received by the receiving buffer 610 included in the CDR circuit 600 of the data driving device 120 . During the first time period, when the receiving buffer 610 of the data driving device 120 receives a CEDS communication protocol signal including image data, the data driving device 120 (eg, the first data driving device) 120a) and an adjacent data driving device (eg, the second data driving device 120b) sharing the same first communication line LN1 may be controlled not to receive the image data.

According to an embodiment, after the lapse of the first time period, during the second time period, the data processing device 140 connects the data driving device 120 (eg, the first communication line LN1) through the first communication line LN1. When image data is transmitted to an adjacent data driving device (eg, second data driving device 120b) sharing the first communication line LN1 with one data driving device 120a, the data driving device 120 (For example, the first data driving device 120a) may control not to receive the image data. For example, the control circuit unit 620 stops receiving image data through the first communication line LN1 from the data driving device (eg, the first data driving device 120a) when the first time period elapses. Alternatively, if interrupted, the image is transferred from the data processing device 140 through the second communication line LN2 to an adjacent data driving device (eg, the second data driving device 120b) connected through the second communication line LN2. A signal indicating that data is not received or a signal indicating that reception of the image data is terminated or stopped may be transmitted. According to an embodiment, a signal transmitted from the data driving device 120 to an adjacent data driving device may be referred to as a lock signal. As described above with reference to FIGS. 2, 3, and 4, the second communication line LN2 may be connected in a cascade form between the plurality of data driving devices 120a, 120b, 120c, 120d, 120e, and 120f. . Accordingly, a lock signal received from an adjacent data driving device and input to the control circuit unit 620 may be referred to as a lock in signal, and is output from the control circuit unit 620 and transmitted to an adjacent data driving device. A lock signal that becomes may be referred to as a lock out signal.

According to an embodiment, when the first time interval elapses and the data driving device 120 ends or stops receiving image data through the first communication line LN1, the control circuit unit 620 controls the The reception buffer 610 may be controlled not to receive image data from the data processing device 140 . For example, the control circuit unit 620 controls the bias current supplied to the reception buffer 610 (eg, controls the bias current to be cut off) during the second time interval to control the data driving device ( 120) may control not to receive image data transmitted from the data processing device 140 through the first communication line LN1.

7 is a diagram illustrating a configuration of a data driving device according to an exemplary embodiment. Referring to FIG. 7 , the first data driving device 120a may include a first clock data recovery (CDR) circuit 600a, and the second data driving device 120b may include a second CDR circuit. (600b) may be included.

According to an embodiment, the first CDR circuit 600a may include a first receive buffer 610a, a first control circuit unit 620a, and a first data recovery circuit 630a. The second CDR circuit 600b may include a second receive buffer 610b, a second control circuit 620b, and a second data recovery circuit 630b.

As described above, the first data driving device 120a and the second data driving device 120b may be connected to the data processing device 140 by sharing the same first communication line LN1. As shown in FIG. 7 , the first communication line LN1 may branch at points A and B to be connected in parallel to the first CDR circuit 600a and the second CDR circuit 600b. The parallel connection form shown in FIG. 7 may be referred to as a multi-drop, but is not limited to the term.

According to an embodiment, when the first data driving device 120a receives image data through the first communication line LN1 during the first time period, the second data driving device 120b includes The second CDR circuit 600b may be controlled not to receive the image data. According to an embodiment, the second control circuit unit 620b of the second CDR circuit 600b may control the second receive buffer 610b not to receive image data from the data processing device 140. . For example, the second control circuit unit 620b controls the bias current supplied to the second reception buffer 610b (eg, controls the bias current to be cut off) during the first time interval to The data driving device 120 may be controlled not to receive image data transmitted from the data processing device 140 through the first communication line LN1. The second control circuit unit 620b blocks the bias current supplied to the second receive buffer 610b during the first time interval and controls the second receive buffer 610b to be turned off, thereby controlling the second receive buffer 610b to be turned off. The data driving device 120b may not operate. Accordingly, the impedance miss at points where the first communication line LN1 shared by the first data driving device 120a and the second data driving device 120b diverge (eg, point A and point B). matching problem can be solved.

According to an embodiment, when the first time interval elapses and the second data driving device 120b receives image data through the first communication line LN1 during the second time interval, the first data The first CDR circuit 600a included in the driving device 120a may be controlled not to receive the image data. According to an embodiment, the first control circuit unit 620a of the first CDR circuit 600a may control the first receive buffer 610a not to receive image data from the data processing device 140. . For example, the first control circuit unit 620a controls the bias current supplied to the first receiving buffer 610a (eg, controls the bias current to be cut off) during the second time period to The data driving device 120 may be controlled not to receive image data transmitted from the data processing device 140 through the first communication line LN1.

According to an embodiment, when the first time interval elapses and the first data driving device 120a ends or stops receiving image data through the first communication line LN1, the first control circuit unit 620a ) receives the image data from the data processing device 140 through the second communication line LN2 to the second control circuit unit 620b of the second data driving device 120b connected through the second communication line LN2. A signal indicating non-reception or a signal indicating termination or interruption of the reception of the image data (eg, a lock signal) may be transmitted. According to an embodiment, the second control circuit unit 620b of the second data driving device 120b receives the lock signal from the first control circuit unit 620a of the first data driving device 120a, and Image data transmitted from the processing device 140 through the first communication line LN1 may be received through the second receive buffer 610b.

As described above, according to the present embodiment, a data processing device (eg, a timing controller or a data processing circuit) uses a plurality of data driving circuits (or data driving devices) to signal (eg, a clock embedded data signal) based on a dedicated protocol. When transmitting a clock embedded data signal (CEDS), the number of connectors can be reduced by time-dividing and sharing a communication line between adjacent data driving circuits.

In addition, for example, a slim PCB can be implemented by reducing the number of connectors in a display device, and manufacturing costs of the set can be reduced.

In the foregoing, for convenience of explanation, an embodiment of transmitting a signal based on the CEDS communication protocol from a data processing device to a data driving device has been described, but display panel driving for transmitting data from one device to a plurality of devices has been described. It can be applied to any communication interface for

Claims (17)

a reception buffer for receiving image data transmitted from a data processing device during a first time interval through a first communication line shared with an adjacent data driving device and connected to the data processing device; and
After the first time interval has elapsed, during a second time interval during which the adjacent data driving device receives the image data from the data processing device through the first line, the image data is not received from the data processing device. , A data driving device comprising a; control circuit unit for controlling According to claim 1,
The control circuit part,
During the second time period, the receiving buffer controls not to receive the image data, the data driving device. According to claim 2,
The control circuit part,
and controlling not to receive the image data by controlling a bias current of the receiving buffer during the second time period. According to claim 2,
The control circuit part,
After the first time interval has elapsed, transmit a lock signal indicating not to receive the image data from the data processing device to the adjacent data driving device through a second communication line connected to the adjacent data driving device. Controlling, data-driven device. According to claim 1,
The receiving buffer,
A data driving device that receives a clock embedded data (CED) signal including clock training data in the image data from the data processing device. According to claim 5,
The data driving device,
The data driving device further includes a data restoration circuit for restoring image data based on the clock training data included in the clock embedded data received through the reception buffer. According to claim 1,
The first communication line,
A data driving device connected in parallel to two or three or more data driving devices from the data processing device. receiving image data transmitted from the data processing device during a first time period in a reception buffer through a first communication line shared with an adjacent data driving device and connected to the data processing device; and
After the first time interval has elapsed, during a second time interval during which the adjacent data driving device receives the image data from the data processing device through the first line, the image data is not received from the data processing device. A control method of a data driving device comprising the; According to claim 8,
Controlling the receiving buffer not to receive the image data during the second time interval, a control method of a data driving device. According to claim 9,
The method of claim 1 , wherein during the second time interval, controlling a bias current of the reception buffer so that the image data is not received. According to claim 8,
Transmitting a lock signal indicating not to receive the image data from the data processing device to the adjacent data driving device through a second communication line connected to the adjacent data driving device after the first time period has elapsed. A method of controlling a data driving device, further comprising steps. a data processing device that generates and transmits image data;
a first data driving device receiving the image data from the data processing device during a first time interval through a first communication line connected to the data processing device; and
It is connected to the data processing device by sharing the first communication line with the first data driving device, and is connected to the data processing device during a second time period through the first communication line shared with the first data driving device. A second data driving device receiving the image data;
The first data driving device,
During the second time period during which the second data driving device receives the image data from the data processing device through the first line, the image data is not received from the data processing device through the first communication line. control, display device. According to claim 12,
The first data driving device,
Controlling not to receive the image data by controlling a bias current of a receiving buffer included in the first data driving device during the second time period. According to claim 12,
The first data driving device,
After the first time period has elapsed, a lock signal indicating not to receive the image data from the data processing device is transmitted to the second data driving device through a second communication line connected to the second data driving device. Transmitting, display device. According to claim 12,
The data processing device,
Transmitting a clock embedded data (CED) signal including clock training data in the image data to the first data driving device or the second data driving device through the first communication line. According to claim 12,
The first communication line,
A display device connected in parallel to two or three or more data driving devices from the data processing device. According to claim 12,
and a third data driving device configured to receive the image data from the data processing device during the first time interval through a third communication line with the first data driving device.

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