KR102601613B1 - Display device and method for driving the same - Google Patents

Abstract

The present invention relates to a display device and a driving method. The disclosed configuration controls the gate driver and upper and lower data drivers of the display panel, and analyzes an externally applied image to perform single bank driving and double bank driving according to the type of image. Includes a timing controller that selects.

Description

Display device and driving method {DISPLAY DEVICE AND METHOD FOR DRIVING THE SAME}

The present invention relates to a technology for driving a display device, and in particular, a display device and driving method that can selectively apply single bank or double bank driving depending on the type of image input to the display device. It's about.

Flat panel displays include Liquid Crystal Display Device (LCD), Organic Light Emitting Display Device (OLED display), Electrophoretic Display Device (EPD), and Plasma Display. Panel: PDP), etc.

Among these display devices, the active matrix driven liquid crystal display displays moving images using a thin film transistor (hereinafter referred to as "TFT") as a switching element.

Liquid crystal displays can be miniaturized compared to cathode ray tubes (CRTs), so they are used as displays in portable information devices, office equipment, computers, etc., and are also applied to televisions, quickly replacing cathode ray tubes.

The liquid crystal display device includes a liquid crystal display panel, a backlight unit that irradiates light to the liquid crystal display panel, a source driver integrated circuit (IC) to supply data voltage to the data lines of the liquid crystal display panel, and a gate line of the liquid crystal display panel. It includes a gate driver IC for supplying gate pulses (or scan pulses) to the fields (or scan lines), a control circuit for controlling the ICs, and a light source driving circuit for driving light of the backlight unit.

The liquid crystal display device displays images corresponding to video signals by adjusting the light transmittance of liquid crystal cells on the liquid crystal panel. The liquid crystal display device is equipped with a liquid crystal panel driving device to drive liquid crystal cells on the liquid crystal panel.

In addition, Organic Light Emitting Display Device (OLED display) uses a self-emitting element that emits light on its own, so it has a fast response speed and has the advantages of luminous efficiency, brightness, and viewing angle, so it is widely applied to large models. there is.

The organic electroluminescent display device arranges a plurality of subpixels containing organic light emitting diodes in a matrix form, selects the subpixels by selectively turning on the TFT, which is an active element, through a scan pulse, and then adjusts the brightness of the selected subpixels. Controlled according to the gradation of digital video data.

In order to drive a display device including an organic light emitting display device, a source driver IC and a gate driver IC connected to the data wire and the gate wire, respectively, are mounted on one side or the other side of the panel in various ways as described above. , the display device can be selectively driven using a double bank or single bank method depending on the location of each driving driver.

Additionally, display devices are divided into single bank type and double bank type depending on the arrangement of the data driving integrated circuit.

In a single-bank type display device, the chips of the data driving integrated circuit are placed only on one edge of the display panel, while in the double-bank type display device, the chips of the data driving integrated circuit are distributed across two corresponding edges of the display panel. It will happen.

Conventionally, display panels of a certain size are driven with a single bank depending on the driving ability of the data driving integrated circuit, and in the case of very large display panels, when driven with a single bank, luminance decreases due to a decrease in the driving ability of the data D-IC. Since degradation occurs, it is operated in double bank.

However, due to limitations in the driving ability of the data driving circuit, power consumption increases by connecting the data driving integrated circuit, that is, the source data D-IC (Source Driver circuit), to the top and bottom of the display panel and driving the top and bottom simultaneously. In particular, in the case of ultra-large display models, due to limitations in the driving capacity of the data D-IC, they are designed as double banks. Since both the upper and lower data D-ICs always output data to drive the screen, power consumption increases.

Meanwhile, when designing a display panel, a simulation is conducted based on the worst driving pattern, and if single bank operation is not possible, double bank design is performed.

In addition, even when driving a typical general pattern or video that does not lack driving capacity, excessive power consumption occurs because it is driven in a double bank.

The purpose of the present invention is to provide a display device and a driving method that can reduce power consumption by selectively using single-bank driving or double-bank driving depending on the type of input image provided to the display device.

In order to solve the above problem, in one aspect, the present invention controls the gate driver and the upper and lower data drivers connected to the display device, analyzes the image applied from the outside, and drives a single bank according to the type of image. and a timing controller that selects double bank operation.

The timing controller includes an image analysis unit that analyzes image data provided from the outside, a signal control unit that controls signals according to the analyzed image type, and an enable (En) signal to output the output signal from the signal control unit to the data driver. It may include an internal interface (EPI) that

Additionally, the timing controller of the display device according to the present invention can select single bank operation when an image input from the outside is analyzed as a video or photo.

The timing controller of the display device according to the present invention outputs a control signal to select single bank driving to enable (En) only one data driver among the upper and lower data drivers and disable (Disable) the other data driver. You can.

The timing controller of the display device according to the present invention can select double bank operation when the image input from the outside is a single color or simple pattern.

The timing controller of the display device according to the present invention outputs a control signal to select double bank operation when the image input from the outside is a simple still image or a special pattern, and operates the upper and lower data drivers 130 and 140. ) can be enabled (En).

The image analysis unit, which constitutes the timing controller of the display device according to the present invention, includes a frame storage unit that stores an image input from the outside, and determines whether the input image is a video, a complex photo, a simple still image, a single color, or a simple pattern. It may include an image judgment unit that determines .

The image determination unit of the display device according to the present invention includes a video unit that determines whether the image input to the frame storage unit is a video, a photo unit that determines whether the input image is a complex photo, and a video unit that determines whether the input image is a complex photo. It may include a simple still image other than a photo and a simple pattern unit that determines whether it is a single color or a simple pattern.

The video unit of the display device according to the present invention includes an image comparison unit that compares the previous image and the current image to determine whether it is the same image or a different image, and an image maintenance unit that maintains the state for several seconds if these images are not the same image. , It may include a video determination unit that determines that another video is a video when it is maintained for several seconds.

If the video unit determines that the previous image and the current image are the same, the photo unit of the display device according to the present invention compares adjacent data in the image to compare data to see if the different data is less than several tens of percent based on the entire image. It may include a time continuation unit that counts the time in which the different data is not less than several tens of percent, and a photo judgment unit that judges the photo to be a photo when the state continues for several seconds.

In order to solve the above problem, in another aspect, the present invention provides a method of driving a display device comprising the step of analyzing an externally applied image and selecting single bank driving or double bank driving of the display device according to the type of image. can be provided.

The display device according to the present invention can output a control signal for selecting single bank driving through a timing controller when an image input from the outside is analyzed as a video or photo.

The method of driving a display device according to the present invention outputs a control signal for selecting single bank driving through a timing controller to enable (En) only one data driver among the upper and lower data drivers and disable the other data driver. You can disable it.

The method of driving a display device according to the present invention can output a control signal for selecting double bank driving through a timing controller when an image input from the outside is a single color or simple pattern.

The method of driving a display device according to the present invention can enable (En) the upper and lower data drivers by outputting a control signal for selecting double bank driving through a timing controller.

The method of driving a display device according to the present invention can store an image input from the outside through a timing controller, and determine whether the stored image is a moving image, a complex photo, a simple still image, a single color, or a simple pattern.

The method of driving a display device according to the present invention compares the previous image with the current image through a timing controller to determine whether it is the same image or a different image, and if these images are not the same image, the status is continued for several seconds to determine that it is a moving image. can do.

In the method of driving a display device according to the present invention, when the previous image and the current image are determined to be the same image through the timing controller, adjacent data in the image are compared to determine whether the different data is less than several tens of percent based on the entire image. , by counting the time in which the different data is not less than tens of percent, it can be judged as a photograph if the state lasts for several seconds.

The method of driving a display device according to the present invention is to compare adjacent data in the image when the previous image and the current image are determined to be the same image through a timing controller, and if the difference is less than several tens of percent, a simple still image or a monochromatic image is displayed. Or, it can be judged by a simple pattern.

The display device and driving method according to the present invention consume modules with a double bank driving concept of a very large display device through selective driving of single bank and double bank due to limitations in driving ability of the driving driver circuit. Power can be reduced.

In addition, the display device and driving method according to the present invention are operated with a single bank when driving videos and complex photos in which it is difficult for the user to perceive the difference in luminance, and when other simple still images and special patterns are input. It can be driven by double bank.

1 is a schematic configuration diagram of a display device according to the present invention.
Figure 2 is a diagram showing the single bank and double bank selection driving of the display device according to the present invention.
Figure 3 is a diagram showing the internal configuration of the timing controller of the display device according to the present invention, showing the configuration during single bank and double bank selection driving.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the attached drawings. Like reference numerals refer to substantially the same elements throughout the specification. In the following description, if it is determined that a detailed description of a known function or configuration related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description will be omitted.

Additionally, the display device according to the present invention will be described using an organic light emitting display device (OLED display) as an example. However, the display device according to the present invention is not limited to a liquid crystal display device, but includes a liquid crystal display device (LCD), an electrophoretic display device (EPD), and a plasma display panel. It is decided to clarify that it can also be applied to PDP), etc.

1 is a schematic configuration diagram of a display device according to the present invention.

The display device according to the present invention is a display device designed as a double bank, and is an image pattern input when the screen is driven in a very large display model, for example, a video, a complex photo, a single color, or a special pattern. Depending on the type, it can optionally be operated as a single bank.

Referring to FIG. 1, a display device according to the present invention includes a display panel 100 provided with a plurality of gate lines (GL1 to GLn) and a plurality of data lines (DL1 to DLm), and a plurality of gate lines (GL1 to DLm). Gate drivers 110 and 120 driving GLn), upper and lower data drivers 130 and 140 driving a plurality of data lines (DL1 to DLm), and gate drivers 110 and 120 and data drivers 130. , 140), a timing controller 200 that analyzes an externally applied image and selects single bank operation or double bank operation depending on the type of image, and the timing controller 200 It includes a host system 300 that sends an image to the display panel 100, and a supply voltage generator 400 (VDD) that provides a supply voltage necessary to drive pixels on the display panel 100.

The display panel 100 includes a plurality of pixels arranged in a matrix. In the display panel 100, a plurality of gate lines (GL1 to GLn) and a plurality of data lines (DL1 to DLm) are arranged to cross each other.

Additionally, the display panel 100 can be divided into a light-emitting area (not shown) where images are actually output and a non-light-emitting area where images are not output.

One gate line (GL), one data line (DL), and a supply voltage line (not shown) may be disposed in each pixel (not shown). Each pixel (not shown) may include a first transistor electrically connected between a gate line (GL), a data line (DL), and a first node (not shown).

And, in the pixel, between the first node, the supply voltage line, and the second node

An electrically connected second transistor may be included. A storage capacitor (Cst, not shown) may be formed between the first and second nodes. Each pixel may include an organic light emitting diode (OLED, not shown) electrically connected to the second node.

The timing controller 200 (TCON) is a gate control device that controls the gate drivers 110 and 120 using synchronization signals (not shown) and clock signals (CLK, not shown) input from the external host system 300. A signal (not shown, GCS; gate control signal) and a data control signal (DCS; not shown, data control signal) that control the upper and lower data drivers 130 and 140 are generated.

Additionally, the timing controller 200 receives image data (DATA) in units of frames from the external host system 300. Image data in units of frames is rearranged by the timing controller 200 to match the driving mode of the display panel 100 and supplied to the upper and lower data drivers 130 and 140.

The supply voltage generator 400 (VDD) provides the supply voltage required to drive the pixels on the display panel 100 and supplies it to the display panel through a supply voltage line (not shown).

In addition, the OLED supply voltage generator (not shown) supplies a low-potential supply voltage to the organic light-emitting diode (OLED, not shown) of the display panel 100, and the organic light-emitting diode (OLED) is turned on by the supply voltage. (ON) state and emits light. That is, while the supply voltage control signal is supplied from the timing controller 200 to the OLED supply voltage generator (not shown), the organic light emitting diode (OLED) receives the supply voltage and generates light. That is, the OLED supply voltage generator (not shown) generates the supply voltage necessary to drive the pixels on the display panel 100 and supplies the supply voltage to the display panel 100 through the supply voltage line (not shown). Perform.

The supply voltage generator 400 (VDD) selectively outputs the supply voltage to the upper and lower data drivers 130 and 140 connected to the display panel 100 through the power block 410.

Meanwhile, the supply voltage line (not shown) for supplying the supply voltage to the display panel 100 is branched into a plurality of high potential lines on the display panel and is commonly connected to the pixels formed for each column (vertical line). there is. That is, in the display panel 100, high potential lines branching from the supply voltage line are formed for each column (vertical line) in the emitting area and the non-emitting area of the display panel. In particular, the high potential line formed in the non-emission area of the display panel may branch from the supply voltage line and be connected to a pixel for each column of the light emitting area.

Figure 2 is a configuration diagram of the display device according to the present invention when driving in single bank and double bank selection.

Referring to FIG. 2, the timing controller 200 (TCON) includes an image analysis unit 210 that analyzes image data provided from a host system 300 (host system), and a signal control unit that controls signals according to the type of the analyzed image. It includes (240) and an internal interface (EPI) (250, 252) that enables (En) to output the output signal from the signal control unit (240) to the data drivers (130, 140).

In addition, the timing controller 200 analyzes the image input from the host system 300 through the image analysis unit 210 and analyzes the image to the data drivers 130 and 140 through the first and second power blocks 412 and 414. Enable (En).

When the image input to the timing controller 200 is analyzed as a video or photo, the timing controller 200 outputs a control signal to select single bank operation to control the upper and lower data drivers 130 and 140. ), only one data driver is enabled (En), and the other data driver is disabled. At this time, power consumption is reduced by disabling one data driver. That is, the internal interface (EPI) output of the other data driver can be limited and the power supply from the power block 410 can be disabled.

Meanwhile, when the image input to the timing controller 200 is a simple still image or a special pattern, the timing controller 200 outputs a control signal to select double bank operation to control the upper and lower data drivers 130. , 140) are all enabled (En).

The power block 410 includes first and second power blocks 412 and 414 respectively connected to the upper and lower data drivers 130 and 140, and through these first and second power blocks 412 and 414, The supply voltage is selectively output to the upper and lower data drivers 130 and 140 connected to the display panel 100.

A method of driving a display device according to the present invention having the above configuration will be described with reference to FIG. 3 as follows.

Figure 3 is a diagram showing the internal configuration of the timing controller of the display device according to the present invention, showing the configuration during single bank and double bank selection driving.

Referring to FIG. 3, the image analysis unit 210 (image analysis unit) constituting the timing controller 200 includes a frame storage unit 210 that stores the image input from the host system 300, and the input image is a video. Alternatively, it includes an image determination unit 230 that determines whether the photo is a complex photo, a simple still image, a single color, or a simple pattern.

The image determination unit 230 includes a video unit 232 that determines whether the image input to the frame storage unit 210 is a video, a photo unit 234 that determines whether the input image is a complex photo, and an input It includes a simple pattern unit 236 that determines whether the image is a simple still image, a single color, or a simple pattern other than a video or a complex photo.

The video unit 232 includes an image comparison unit 232a that compares the previous image and the current image to determine whether it is the same image or a different image, and an image maintenance unit that continues the state for several seconds if these images are not the same image ( 232b) and a video determination unit 232c that determines that another video is a video when it is maintained for several seconds.

At this time, if the current image and the previous image are different images and this state does not last for several seconds, the image is sent back to the previous step, the image comparison unit 232a, and the above-described process is performed again.

In addition, if the video unit 232 determines that the previous image and the current image are the same, the photo unit 234 compares adjacent data in the image to determine whether the different data is tens of percent or less based on the entire image. A data comparison unit 234a, a time continuation unit 234b that counts the time when different data is not less than tens of percent, and a photo judgment unit that judges it to be a photo when the state lasts for several seconds ( 234c).

At this time, the image comparison unit 232a of the photo unit 232 can separately set a threshold for how much image difference occurs when comparing adjacent data in the image. And, if the state in which the different data is not less than tens of percent does not last for several seconds, the data is sent back to the previous step, the data comparison unit 232a, and the above-described process is performed again.

Additionally, when comparing the image with adjacent data from the photo unit 234, the simple pattern unit 236 determines that the image is a still image, a single color, or a simple pattern if the different data is less than several tens of percent of the image.

Referring to FIG. 3, if the image stored in the frame memory unit 220 is determined to be a video or a complex photo through the image analysis unit 210 inside the timing control unit 200, single bank operation is performed. The selected control signal is output externally from the signal control unit 240 in the timing controller 200 to one of the first and second internal interfaces (EPI, 250, 252), for example, the first internal interface (EPI, 250). It is enabled (En), and then the first internal interface (EPI, 252) is output only to the upper data driver 130 to drive single bank.

At this time, the control signal for selecting single bank driving is disabled in the second internal interface (EPI) 252, and power to the lower data driver 140 is limited. In this case, power may not be applied to the lower data driver 140, a control signal may not be output from the timing controller 200 to the lower data driver 140, or the logic inside the lower data driver 140 ( You can disable the Logic section.

Therefore, if the image input from the outside is determined to be a video or a complex photo, the timing controller 200 outputs a control signal for selecting single bank operation to only one of the first and second internal interfaces (EPI; 250, 252). , the display device is driven in a single bank by allowing power to be applied to only one of the upper and lower data drivers 130 and 140.

Meanwhile, referring to FIG. 3, the images stored in the frame memory unit 220 through the image analysis unit 210 in the timing controller 200 are simple still images and special patterns other than moving pictures or complex photos, that is, monochromatic or simple images. If it is determined to be a pattern, etc., a control signal for selecting double bank (single bank) operation is output to the outside of the timing controller 200 and is applied to both the first and second internal interfaces (EPI; 250, 252). EPI; 250, 252) is enabled (En), and then the first and second EPIs are output to the upper and lower data drivers 130 and 140, respectively, to perform double bank driving.

Therefore, if the image input from the outside is determined to be a simple still image other than a video or a complex photo, or a special pattern, such as a single color or simple pattern, double bank driving is selected through the signal control unit 240 inside the timing controller 200. The display device is driven in double bank mode by outputting control signals to the first and second internal interfaces (EPI) 250 and 252 to apply power to the upper and lower data drivers 130 and 140.

As described above, the display device according to the present invention selectively drives single bank and double bank modules with a double bank driving concept for ultra-large display devices due to limitations in the driving ability of the driving driver circuit. Power consumption can be reduced through this.

In particular, the present invention can be driven with a single bank when driving videos and complex photos in which it is difficult for the user to perceive differences in luminance, and can be driven with a double bank when other simple still images and special patterns are input. As a result, power consumption can be effectively reduced.

Although embodiments have been described above with reference to the drawings, the present invention is not limited thereto.

The above description is merely an illustrative explanation of the technical idea of the present invention, and various modifications and variations will be possible to those skilled in the art without departing from the essential characteristics of the present invention.

Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but rather to explain it, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted in accordance with the claims below, and all technical ideas within the equivalent scope should be construed as being included in the scope of rights of the present invention.

100: display device 110: gate driver
130: upper data driver 140: lower data driver
200: Timing controller 210: Video analysis unit
220: frame memory unit 230: image judgment unit
240: signal control unit 250, 252: internal interface (EPI)
300: host system

Claims (19)

A display panel including a plurality of gate lines and a plurality of data lines;
a first gate driver and a second gate driver driving the plurality of gate lines—the first gate driver is disposed on one side of the display panel, and the second gate driver is disposed on the other side of the display panel;
an upper data driver and a lower data driver driving the plurality of data lines;
a timing controller that controls the first gate driver, the second gate driver, the upper data driver, and the lower data driver, and operates by selecting either a single bank or a double bank depending on the type of image applied from the outside; and
It includes a supply voltage generator that applies voltage to the upper data driver and the lower data driver,
The timing controller is,
When the image input from the outside is a video or photo, it is driven with a single bank that enables one of the upper data driver and the lower data driver,
A display device driven by a double bank that enables the upper data driver and the lower data driver when the externally input image is a single color and a simple pattern. According to paragraph 1,
The timing controller is,
An image analysis unit that analyzes image data provided from outside,
A signal control unit that controls the signal according to the type of image analyzed,
A display device including an internal interface (EPI) that enables (En) to output an output signal from a signal control unit to the upper data driver and the lower data driver. delete delete delete delete According to paragraph 1,
The image analysis unit constituting the timing controller,
A frame storage unit that stores images input from the outside,
A display device including an image judgment unit that determines whether the input image is a moving image, a complex photo, a simple still image, a single color, or a simple pattern. In clause 7,
The video judgment unit,
a video unit that determines whether the image input to the frame storage unit is a video;
a photo unit that determines whether the input image is a complex photo;
A display device including a simple pattern unit that determines whether the input image is a video, a complex photo, a simple still image, a single color, or a simple pattern. According to clause 8,
The video section,
An image comparison unit that compares the previous image with the current image to determine whether it is the same image or a different image,
an image maintenance unit that maintains a comparison state for several seconds when the previous image and the current image are not the same image;
A display device including a video determination unit that determines that the other video is a video when it is maintained for several seconds. According to clause 8,
The photo department
If the video unit determines that the previous video and the current video are the same video, a data comparison unit that compares adjacent data in the video to see if the difference in data is less than several tens of percent based on the entire video;
A time continuation unit that counts the time when different data is not less than several tens of percent,
A display device including a photo judgment unit that determines that the photo is a photo when the above state persists for several seconds. Connecting a first gate driver and a second gate driver for driving the gate lines and an upper data driver and a lower data driver for driving the data lines to a display panel provided with a plurality of gate lines and a plurality of data lines - The first gate driver is disposed on one side of the display panel, and the second gate driver is disposed on the other side of the display panel. and
It includes the step of selecting and operating either a single bank or a double bank depending on the type of image applied from the outside,
The step of selecting and operating either a single bank or a double bank according to the type of image applied from the outside is:
When the image input from the outside is a video or a photo, it is driven with a single bank that enables one of the upper data driver and the lower data driver, and the image input from the outside is a single color and a simple pattern. In this case, a method of driving a display device including the step of driving with a double bank that enables the upper data driver and the lower data driver. delete delete delete delete According to clause 11,
The step of selecting and operating either a single bank or a double bank according to the type of image applied from the outside is:
A method of driving a display device including the step of storing an image input from an external source and determining whether the stored image is a video, a complex photo, a simple still image, a single color, or a simple pattern. According to clause 11,
The step of selecting and operating either a single bank or a double bank according to the type of image applied from the outside is:
A method of driving a display device including the step of comparing the previous image and the current image through a timing controller to determine whether it is the same image or a different image, and if these images are not the same image, maintaining the status for several seconds to determine that it is a moving image. . According to clause 11,
The step of selecting and operating either a single bank or a double bank according to the type of image applied from the outside is:
If the previous image and the current image are determined to be the same image through the timing controller, comparing adjacent data in the image to determine whether the difference in data is less than several tens of percent based on the entire image; and
A method of driving a display device including the step of counting the time in which different data is not less than several tens of percent and determining a photo if the state lasts for several seconds. According to clause 11,
The step of selecting and operating either a single bank or a double bank according to the type of image applied from the outside is:
If the previous image and the current image are determined to be the same image through the timing controller, comparing adjacent data in the image and determining that it is a simple still image, a single color, or a simple pattern if the different data is less than several tens of percent. How to drive a display device.

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