KR102416694B1 - Controller, display device, and the method for driving the display device - Google Patents

Abstract

The present embodiments relate to a controller, a display device, and a driving method thereof for preventing a logo afterimage, and more specifically, by alternately displaying an original image in which the logo is expressed and an image in which the logo is not intentionally expressed, the logo Disclosed are a controller, a display device, and a method of driving the same, which can prevent continuously being displayed at a fixed position, and thereby effectively prevent a logo afterimage and greatly increase user satisfaction with image quality.

Description

Controller, display device and driving method thereof

The present embodiments relate to a controller, a display device, and a driving method thereof.

As the information society develops, the demand for display devices for displaying images is increasing in various forms, and in recent years, liquid crystal display devices (LCDs), plasma display devices (PDPs), organic Various display devices such as an organic light emitting display device (OLED) are being used.

On the other hand, on the screen of such various display devices, a logo corresponding to an image designed or lettered for the purpose of informing a certain information using letters, symbols, numbers, etc. may be displayed.

Such a logo may be, for example, an image representing information for displaying broadcast channel information, broadcast program information, various guide information, subtitles, weather information, sports relay guide information, and the like.

Such a logo is often displayed for a long time without changing in a fixed position such as the upper right or left of the screen, the lower left or right or the center of the screen, in general, even if the overall image around it is changed.

As such, when the logo is displayed at a fixed position for a long time, there is a problem in that an afterimage of the previously displayed logo is displayed on the frame screen on which the logo is not displayed.

Such a logo afterimage may be a factor of lowering user satisfaction with the image quality of the display device.

A technology for preventing such a logo afterimage is being developed, and among them, a technology for reducing the luminance of the logo area is representative.

Such a conventional logo afterimage prevention technology has a problem in that not only the logo but also the luminance around the logo is lowered as a whole.

In addition, in the case of the conventional logo afterimage prevention technology, since the logo itself is continuously expressed, there is a problem that fundamental improvement is impossible.

An object of the present embodiments is to provide a controller, a display device, and a driving method thereof that can effectively prevent a logo afterimage.

Another object of the present embodiments is to provide a controller, a display device, and a driving method thereof capable of preventing a logo afterimage without reducing the luminance of the logo and its surroundings.

In one aspect, the present exemplary embodiments provide a display panel in which a plurality of subpixels defined by a plurality of data lines and a plurality of gate lines are arranged, a data driver for driving the plurality of data lines, and a plurality of gate lines for driving the plurality of gate lines It is possible to provide a display device including a scan driver, a data driver, and a controller for controlling the scan driver.

In such a display device, the display panel displays a frame screen in which the logo is not displayed for N (N is a natural number greater than or equal to 1) frame period after displaying the frame screen in which the logo is expressed, and then, the logo is displayed. The displayed frame screen can be displayed again.

In another aspect, the present embodiments include a logo recognition unit for recognizing a logo area corresponding to an expression area of a logo on a frame screen by analyzing frame data, and M (M is a natural number greater than or equal to 1) frame sections. The logo display data for displaying the logo on the frame screen based on the frame data is output for M frame sections, and thereafter, the logo is displayed on the frame screen based on the frame data for N (N is a natural number greater than or equal to 1) frame sections. It is possible to provide a controller for a display device that includes a logo display control unit that outputs non-logo non-expression data to be non-expressed during N frame sections.

In another aspect, the present embodiments may provide a method of driving a display device including a first step of displaying an original image in which a logo is displayed, and a second step of displaying an image in which the logo is not displayed. .

The second step in this driving method includes the steps of recognizing the logo area by analyzing the frame data, calculating a background image corresponding to the image of the surrounding area of the logo area, and expressing the background image in the logo area. may include

According to the present embodiments as described above, it is possible to provide a controller, a display device, and a driving method thereof that can effectively prevent a logo afterimage.

In addition, according to the present embodiments, it is possible to provide a controller, a display device, and a driving method thereof that can prevent a logo afterimage without reducing the luminance of the logo and its surroundings.

1 is a system configuration diagram of a display device according to the present exemplary embodiment.
2 and 3 are diagrams illustrating a logo displayed on a screen of a display device according to the present exemplary embodiment and a phenomenon in which an afterimage is generated.
4 is a diagram illustrating a method for reducing an afterimage of a display device according to example embodiments.
5 is an exemplary diagram for reducing an afterimage of a display device according to the present exemplary embodiment.
6 is a view for explaining a data supply method of a controller for reducing an afterimage of a display device according to the present exemplary embodiment.
7 is a block diagram of a controller of a display device according to example embodiments.
8 is a diagram for explaining a method of recognizing a logo area by a controller of a display device according to the present exemplary embodiment.
9 is a diagram conceptually illustrating that the controller of the display device according to the present embodiments controls the M+1th frame screen through the image data modulation technique in order not to display the logo.
10 is a diagram conceptually illustrating that the controller of the display device according to the present embodiments controls the M+1th frame screen using frame data before the logo display graphic processing in order not to display the logo.
11 and 12 are flowcharts of a method of driving a display device according to the present exemplary embodiment.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. In adding reference numerals to components of each drawing, the same components may have the same reference numerals as much as possible even though they are indicated in different drawings. In addition, in describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description may be omitted.

In addition, in describing the components of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only for distinguishing the elements from other elements, and the essence, order, order, or number of the elements are not limited by the terms. When it is described that a component is “connected”, “coupled” or “connected” to another component, the component may be directly connected or connected to the other component, but other components may be interposed between each component. It should be understood that each component may be “interposed” or “connected”, “coupled” or “connected” through another component.

These embodiments prevent the logo from being continuously displayed in a fixed position by alternately displaying the original image in which the logo is expressed and the image in which the logo is not intentionally expressed in order to prevent the afterimage of the logo, and through this, Disclosed are a display device 100 capable of effectively preventing a logo afterimage, a driving method thereof, and a controller 140 .

Hereinafter, the display device 100, its driving method, and the controller 140 will be described in detail.

1 is a system configuration diagram of a display device 100 according to the present exemplary embodiment.

Referring to FIG. 1 , the display device 100 according to the present embodiments alternately displays the original image in which the logo is expressed and the image in which the logo is not intentionally expressed, so that the logo is continuously displayed at a fixed position. This is the most effective way to prevent logo afterimage.

Referring to FIG. 1 , in the display device 100 according to the present exemplary embodiment, a plurality of data lines DL and a plurality of gate lines GL are disposed, and a plurality of data lines DL and a plurality of gate lines are disposed. The display panel 110 in which a plurality of sub-pixels (SP) defined by GL are arranged, the data driver 120 driving the plurality of data lines DL, and the plurality of gate lines GL ) includes a scan driver 130 for driving, a data driver 120 , and a controller 140 for controlling the scan driver 130 .

The controller 140 supplies various control signals to the data driver 120 and the scan driver 130 to control the data driver 120 and the scan driver 130 .

The controller 140 starts scanning according to the timing implemented in each frame, and converts the input image data input from the outside according to the data signal format used by the data driver 120 to convert the converted image data (Data) output and control the data operation at an appropriate time according to the scan.

The controller 140 may be a timing controller used in a typical display technology or a control device that further performs other control functions including a timing controller.

The data driver 120 drives the plurality of data lines DL by supplying data voltages to the plurality of data lines DL. Here, the data driver 120 is also referred to as a 'source driver'.

The data driver 120 may include at least one source driver integrated circuit (SDIC) to drive a plurality of data lines.

The scan driver 130 sequentially drives the plurality of gate lines GL by sequentially supplying scan signals to the plurality of gate lines GL. Here, the scan driver 130 is also referred to as a 'gate driver'.

The scan driver 130 may include at least one gate driver integrated circuit (GDIC).

The scan driver 130 sequentially supplies a scan signal of an on voltage or an off voltage to the plurality of gate lines GL under the control of the controller 140 .

When a specific gate line is opened by the scan driver 130 , the data driver 120 converts the image data received from the controller 140 into an analog data voltage and supplies it to the plurality of data lines DL.

Although the data driver 120 is located only on one side (eg, upper or lower side) of the display panel 110 in FIG. 1 , the data driver 120 is located on both sides (eg, upper and lower sides) of the display panel 110 according to a driving method and a panel design method. ) may be located in

Although the scan driver 130 is located only on one side (eg, left or right) of the display panel 110 in FIG. 1 , the scan driver 130 is located on both sides (eg, left and right side) of the display panel 110 according to a driving method, a panel design method, etc. It may be located on the right side).

The above-described controller 140, along with the input image data, includes a vertical sync signal (Vsync), a horizontal sync signal (Hsync), an input data enable (DE: Data Enable) signal, various types including a clock signal (CLK), etc. Timing signals are received from the outside (eg host system).

The controller 140 receives timing signals such as a vertical synchronization signal (Vsync), a horizontal synchronization signal (Hsync), an input DE signal, and a clock signal to control the data driver 120 and the scan driver 130, Various control signals are generated and output to the data driver 120 and the scan driver 130 .

For example, the controller 140 controls the scan driver 130 , a gate start pulse (GSP), a gate shift clock (GSC), and a gate output enable signal (GOE: Various gate control signals (GCS: Gate Control Signal) including Gate Output Enable) are output.

Here, the gate start pulse GSP controls the operation start timing of one or more gate driver integrated circuits constituting the scan driver 130 . The gate shift clock GSC is a clock signal commonly input to one or more gate driver integrated circuits, and controls shift timing of a scan signal (gate pulse). The gate output enable signal GOE specifies timing information of one or more gate driver integrated circuits.

In addition, the controller 140 controls the data driver 120 , a source start pulse (SSP), a source sampling clock (SSC), and a source output enable signal (SOE: Source Output). Enable) and output various data control signals (DCS: Data Control Signal).

Here, the source start pulse SSP controls the data sampling start timing of one or more source driver integrated circuits constituting the data driver 120 . The source sampling clock SSC is a clock signal that controls sampling timing of data in each of the source driver integrated circuits. The source output enable signal SOE controls the output timing of the data driver 120 .

The data driver 120 may include at least one source driver integrated circuit (SDIC) to drive a plurality of data lines.

Each source driver integrated circuit SDIC is connected to a bonding pad of the display panel 110 by a tape automated bonding (TAB) method or a chip on glass (COG) method, or , may be directly disposed on the display panel 110 , or may be integrated and disposed on the display panel 110 in some cases. In addition, each source driver integrated circuit SDIC may be implemented in a Chip On Film (COF) method mounted on a film connected to the display panel 110 .

Each source driver integrated circuit SDIC may include a shift register, a latch circuit, a digital to analog converter (DAC), an output buffer, and the like.

Each source driver integrated circuit SDIC may further include an analog-to-digital converter (ADC) in some cases.

The scan driver 130 may include at least one gate driver integrated circuit (GDIC).

Each gate driver integrated circuit GDIC is connected to a bonding pad of the display panel 110 by a tape automatic bonding (TAB) method or a chip-on-glass (COG) method, or a gate in panel (GIP) type. may be implemented and disposed directly on the display panel 110 , or may be integrated and disposed on the display panel 110 in some cases. In addition, each gate driver integrated circuit GDIC may be implemented in a chip-on-film (COF) method mounted on a film connected to the display panel 110 .

Each gate driver integrated circuit GDIC may include a shift register, a level shifter, and the like.

The display device 100 according to the present exemplary embodiment includes at least one source printed circuit board (S-PCB) and control components necessary for circuit connection to at least one source driver integrated circuit (SDIC). and a control printed circuit board (C-PCB) for mounting various electric devices.

At least one source driver integrated circuit (SDIC) may be mounted on at least one source printed circuit board (S-PCB), or a film on which at least one source driver integrated circuit (SDIC) is mounted may be connected.

The control printed circuit board (C-PCB) includes a controller 140 for controlling operations of the data driver 120 and the scan driver 130 , the display panel 110 , the data driver 120 , and the scan driver 130 . ) to supply various voltages or currents, or a power controller that controls various voltages or currents to be supplied may be mounted.

The at least one source printed circuit board (S-PCB) and the control printed circuit board (C-PCB) may be circuitly connected through at least one connecting member.

Here, the connecting member may be a flexible printed circuit (FPC), a flexible flat cable (FFC), or the like.

At least one of the source printed circuit board (S-PCB) and the control printed circuit board (C-PCB) may be integrated into one printed circuit board.

The display device 100 according to the present exemplary embodiment may be a liquid crystal display device, an organic light emitting display device, a plasma display device, or the like.

Each sub-pixel SP disposed on the display panel 110 may have various structures depending on the type of the display device 100 .

For example, when the display panel 110 is an organic light emitting display panel, each subpixel SP includes an organic light emitting diode (OLED) and circuit elements such as a driving transistor for driving the organic light emitting diode (OLED). can be composed of

The type and number of circuit elements constituting each sub-pixel SP may be variously determined according to a provided function and a design method.

2 and 3 are diagrams illustrating a logo displayed on the screen of the display device 100 according to the present exemplary embodiment and an afterimage occurrence phenomenon by the logo.

Referring to FIG. 2 , at least one logo (Logo, 200) may be displayed on the screen of the display device 100 .

In this specification, the logo 200 may refer to an image designed or lettered for the purpose of informing any information using letters, symbols, numbers, and the like.

The logo 200 may be, for example, an image representing information for displaying broadcast channel information, broadcast program information, various guide information, subtitles, weather information, sports relay guide information, and the like.

The logo 200 has a characteristic of being displayed for a long time without changing in a fixed position such as the upper right or left side of the screen, the lower left side or the right side or the center of the screen, in general, even if the entire surrounding image is changed.

Accordingly, the logo 200 may mean anything that is continuously displayed for a predetermined time at a fixed position on the screen.

Referring to FIG. 3 , when the logo 200 is displayed for K frame sections (1st frame section, …, Kth frame section) at a fixed position, the logo 200 is not expressed in the K+1th frame. Even if not, a phenomenon in which the afterimage of the logo displayed up to the Kth frame section is displayed on the K+1th frame screen may occur.

Such a logo afterimage may be a factor that greatly reduces user satisfaction with respect to the image quality of the display device 100 .

Accordingly, the present embodiments may provide a method for reducing an afterimage that prevents a logo afterimage.

Hereinafter, such an afterimage reduction method will be described in detail with reference to FIGS. 4 to 12 .

4 is a diagram illustrating a method for reducing an afterimage of the display device 100 according to the present exemplary embodiment.

Referring to FIG. 4 , the display device 100 according to the present exemplary embodiments displays the frame screen (first time) on which the logo 200 is displayed in order to prevent a logo afterimage that may occur due to the logo 200 being displayed for a long time. After displaying the frame screen, ..., the Mth frame screen, M is a natural number greater than or equal to 1) on the display panel 110, the frame screen in which the logo 200 is not displayed during N (N is a natural number greater than or equal to 1) frame period ( The M+1th frame screen, ..., M+Nth frame screen) may be displayed on the display panel 110 , and then, the frame screen on which the logo 200 is displayed may be displayed again on the display panel 110 .

In other words, the display device 100 according to the present embodiments does not continuously display the frame screen on which the logo 200 is displayed, but does not intentionally express the logo 200 to be displayed in the middle. By displaying the frame screen, the logo 200 is not continuously displayed for a period of time sufficient to generate an afterimage. Accordingly, it is possible to prevent a logo afterimage.

The M value mentioned above is the number of frames in which the logo 200 is continuously displayed, and may be a fixed value or a variable value.

In addition, the N value mentioned above is the number of frames in which the logo 200 is not continuously displayed, and is the number of frames for avoiding the logo afterimage, and may be a fixed value or a variable value.

By appropriately setting these M and N values, in consideration of the afterimage prevention effect due to the logo 200 and the increase in processing load and time for controlling the expression of the logo 200, in a range that does not interfere with the overall image driving efficiency It can effectively prevent afterimage.

5 is an exemplary view of afterimage reduction of the display device 100 according to the present exemplary embodiment.

5 is a diagram exemplarily illustrating a case where the M value, which is the number of frames in which the logo 200 is continuously displayed, is 1, and the N value, which is the number of frames in which the logo 200 is not continuously displayed, is 1.

According to this, the frame screen on which the logo 200 is displayed and the frame screen on which the logo 200 is displayed are alternately displayed for one frame section.

As described above, the display device 100 according to the present embodiments repeatedly displays the frame screen on which the logo 200 is displayed and the frame screen on which the logo 200 is not displayed, so that the logo 200 is displayed. It prevents continuous expression in a fixed position, thereby preventing afterimage.

For such an afterimage reduction method, the controller 140 may change the image data so that a frame screen in which the logo 200 is not displayed is displayed.

6 is a diagram for describing a data supply method of the controller 140 for reducing an afterimage of the display device 100 according to the present exemplary embodiment.

Referring to FIG. 6 , the controller 140 transmits “logo expression data” that allows the logo 200 to be displayed on a frame screen (first frame screen, …, M-th frame screen) corresponding to M frame sections. “Logo non-expression data that is output to the driver 120 and that the logo 200 is not displayed on the frame screen (M+1th frame screen, ..., M+N frame screen) corresponding to N frame sections thereafter " may be output to the data driver 120 .

Here, each frame data may be an aggregate of image data supplied to several sub-pixels, and the logo display data may be image data of each sub-pixel that allows the logo 200 to be displayed on the frame screen, and no logo is displayed. The data may be image data of each sub-pixel that prevents the logo 200 from being displayed on the corresponding frame screen.

As described above, it is possible to prevent a logo afterimage through the image data control of the controller 140 .

The controller 140 may generate non-logo data from frame data for N frame sections, which are logo expression data, and output the data for N frame sections.

Hereinafter, in order to prevent logo afterimage, a method for generating non-logo data that the controller 140 outputs during a frame section in which the logo 200 is not to be displayed will be described.

The controller 140 analyzes the frame data for the N frame sections or the previous frame sections of the N frame sections determined as the frame sections in which the logo 200 is not to be displayed, and corresponds to the N frame sections or the previous frame sections. Recognizes the "logo area" in which the logo 200 is to be displayed or the logo 200 is expressed on the frame screen to Estimated image data for the estimated image may be generated.

By deleting image data corresponding to the logo 200 in the logo area in the frame screen corresponding to the N frame sections to be proceeded and adding estimated image data, it is possible to generate non-logo expression data.

Here, the estimated image is an image estimated to be an image that would exist without the logo 200 , and is referred to as a background image of the logo 200 . Accordingly, the estimated image may be similar to the surrounding image of the logo 200 .

More specifically, the controller 140 may generate an average value of image data for a region surrounding the logo region as the estimated image data.

On the other hand, the controller 140 does not newly generate and output the logo non-expression data that is expressed by replacing the logo 200 with another image (estimated image), but may be output using the previously created non-logo expression data. have.

In this regard, the controller 140, from among the frame data before the logo expression graphic processing and the frame data after the logo expression graphic processing stored in advance inside or outside as frame data for M frame sections, the logo expression graphic processing Based on the frame data, logo expression data is output for M frame sections.

Thereafter, the controller 140, from among the frame data before the logo expression graphic processing and the frame data after the logo expression graphic processing stored in advance inside or outside as frame data for the N frame sections, the frame data before the logo expression graphic processing Based on , it is possible to output non-logo data for N frame sections.

This method may be applied to a case of displaying a broadcast program image having images before and after logo expression graphic processing.

7 is a block diagram of the controller 140 of the display device 100 according to the present exemplary embodiment.

The controller 140 of the display device 100 according to the present embodiments provides a timing control function for a frame section in which a logo is displayed and a frame section in which a logo is not displayed, and a logo 200 in a frame section in which a logo is not displayed, in order to prevent a logo afterimage. ), it is possible to perform a logo expression control function (image data control function) through image data modulation and selection, etc.

The controller 140 may include a logo recognition unit 720 and a logo expression control unit 730 .

The logo recognition unit 720 may recognize the logo area in which the logo 200 is displayed on the frame screen by analyzing the previous frame data or the logo area in which the logo 200 is to be displayed by analyzing the next frame data.

Logo expression control unit 730, logo expression data for displaying the logo 200 on the frame screen based on frame data for M (M is a natural number greater than or equal to 1) frame sections in which the existing logo 200 is to be displayed as it is is output during M frame periods.

Thereafter, the logo expression control unit 730, the logo 200 on the frame screen based on the frame data for N (N is a natural number greater than or equal to 1) frame sections in which the existing logo 200 is not intentionally displayed. Non-logo data to be displayed can be output for N frame sections.

When the above-described controller 140 is used, the logo 200 may not be intentionally displayed in at least one frame section between frame sections in which the logo 200 is displayed. Accordingly, the logo 200 is not continuously displayed for a long time for a period of time sufficient to generate an afterimage, thereby preventing a logo afterimage.

Meanwhile, the controller 140 may further include a storage unit 710 for storing frame data. The storage unit 710 may be external to the controller 140 .

Below, the logo area recognition method and the logo expression control method will be described in more detail.

8 is a diagram for explaining a method of recognizing a logo area by the controller 140 of the display device 100 according to the present exemplary embodiment.

Referring to FIG. 8 , the logo recognition unit 720 includes m*n areas (A, B, C, D, ... , E, G, H, …).

The logo recognition unit 720, for each of the m * n areas (A, B, C, D, ..., E, G, H, ...), the luminance deviation for each frame (the corresponding area in the previous frame and the current frame) , the luminance deviation between the corresponding regions) is detected, and the region E in which the luminance deviation is less than a preset specific value is extracted as a candidate region.

The logo recognition unit 720 divides the extracted candidate area E into several sub areas again.

In the example of FIG. 8 , the logo recognition unit 720 divides the extracted candidate area E into nine sub areas A(11), A(12), A(13), A(21) with 3 rows and 3 columns. , A(22), A(23), A(31), A(32), A(33)).

The logo recognition unit 720 includes nine sub-regions A(11), A(12), A(13), A(21), A(22), A(23), A(31), A( 32) and A(33)), the luminance deviation for each frame is grasped, and the sub-region A(22) having the luminance deviation less than a specific value is extracted secondarily.

The logo recognition unit 720 may recognize the secondly extracted sub area A(22) as the final logo area.

In the example of FIG. 8 , the logo area was recognized through area division in two steps, but in some cases, the logo area may be recognized only by area division in step 1, and the logo area may be recognized through area division in three or more steps. may be

9 is a diagram conceptually illustrating that the controller 140 of the display device 100 according to the present embodiments controls the M+1th frame screen through the image data modulation technique in order not to display the logo 200. . However, the description will be made using the logo area recognition result of FIG. 8 .

Referring to FIG. 9 , the logo expression control unit 730 modulates the original logo expression data included in the frame data for N frame sections in which the logo 200 is not intentionally displayed, into N logo expression data It can be output during the frame period. 9, the first screen is a virtual representation of the M+1th frame screen on which the logo 200 is expressed using the original logo expression data, the second screen conceptually shows the image data modulation process, and the three The th screen is a virtual representation of the M+1 th frame screen on which the logo 200 is not displayed according to the image data modulation result.

Through the above-described image data modulation technique, by modulating and outputting the original image data (logo expression data) in the frame section in which the logo is not intentionally expressed with the logo non-expression data, the display device 100 allows the logo 200 to be displayed. Even if the image data (logo expression data) in the form in which the part with and without the logo 200 is made without distinction is received, the logo 200 may not be displayed during the desired frame period.

More specifically, the logo area recognition unit 720 analyzes frame data for N frame sections, and the logo area (A(22)) in which the logo 200 is to be displayed on the frame screen corresponding to the N frame sections. recognize

Logo expression control unit 730, the peripheral area (A(11), A(12), A(13), A(21), A(23), A(31) of the logo area (A(22)), Based on the image data for A(32) and A(33)), estimated image data for the estimated image 900 to be displayed in the logo area A(22) instead of the logo 200 is generated.

The logo expression control unit 730 deletes the image data corresponding to the logo 200 in the logo area A(22) and inserts (adds) estimated image data corresponding to the estimated image 900, thereby forming the original logo. It is possible to modulate the displayed data to the non-logo expressed data.

Logo expression control unit 730, the peripheral area (A(11), A(12), A(13), A(21), A(23), A(31) of the logo area (A(22)), An average value of the image data for A(32) and A(33) may be generated as estimated image data.

The estimated image data ED 22 for the estimated image 900 to be displayed in the recognized logo area A 22 in the example of FIG. 8 may be generated according to Equation 1 below.

In Equation 1, the ED 22 is estimated image data in the estimated image 900 to be displayed in the logo area A 22 . SUM is an operator that adds all of D(11), D(12), D(13), D(21), D(22), D(23), D(31), D(32), D(33) to be. D(11), D(12), D(13), D(21), D(22), D(23), D(31), D(32), D(33) are sub-region A(11) ), A(12), A(13), A(21), A(22), A(23), A(31), A(32), and A(33).

Here, the estimated image is an image estimated to be an image that would exist without the logo 200 , and is referred to as a background image of the logo 200 . Accordingly, the estimated image may be similar to the surrounding image of the logo 200 .

Through the image data modulation technique described above, in the logo area A (22) where the logo 200 is located, instead of the logo 200, an estimated image 900 estimated to be an image that would exist without the logo 200 By expressing it, it is possible to prevent the logo afterimage while minimizing the image heterogeneity.

10 is a diagram in which the controller 140 of the display device 100 according to the present embodiments controls the M+1th frame screen on which the logo 200 is not intentionally displayed by using the frame data before the logo display graphic processing. It is a diagram conceptually showing the

Referring to FIG. 10 , the logo expression control unit 730 of the controller 140 is configured as frame data for M frame sections (first frame section, second frame section, …, Mth frame section) inside or outside. Among the pre-stored frame data before the logo expression graphic processing and the frame data after the logo expression graphic processing, based on the frame data after the logo expression graphic processing, the logo expression data during the M frame period in which the logo 200 is to be expressed as it is. print out

Referring to FIG. 10 , the logo display control unit 730 of the controller 140 includes N frame sections (M+1th frame section, M+2th frame section, … M+Nth frame section), from among the frame data before the logo expression graphic processing and the frame data after the logo expression graphic processing stored in advance inside or outside, based on the frame data before the logo expression graphic processing, N During the frame period, data without logo can be output.

For example, in the case of a broadcast program image, frame data before the logo expression graphic processing and frame data after the logo expression graphic processing may exist together. Accordingly, when displaying a broadcast program image, the technique shown in FIG. 10 may be used.

If the technique described above with reference to FIG. 10 is utilized, the logo 200 to be displayed is not easily expressed in the absence of any manipulation, thereby significantly reducing the processing load and time for logo expression control compared to the image data modulation technique. can reduce

The driving method for preventing the logo afterimage described above will be briefly described again.

11 and 12 are flowcharts of a method of driving the display device 100 according to the present exemplary embodiments.

Referring to FIG. 11 , the method of driving the display device 100 according to the present embodiments includes displaying an original image in which the logo 200 is displayed ( S1130 ), and an image in which the logo 200 is not displayed. and a step of displaying ( S1140 ) and the like. These steps S1130 and S1140 may be repeatedly performed.

Before S1130, it is determined whether there is a logo 200 that is displayed at a fixed location for a predetermined time or longer, and determining whether there is a possibility of occurrence of a logo afterimage (S1110); When it is determined that the logo 200 exists and it is determined that there is a possibility of occurrence of a logo afterimage, the method may further include a step (S1120) of starting logo display control.

In the above-described step S1110, by appropriately adjusting and setting the reference time for determining whether the logo 200 is present, unnecessary or too frequent logo expression control can be reduced, which greatly affects the image driving efficiency. It can effectively prevent logo afterimage without giving it away.

After the aforementioned step S1140, it can proceed again from step S1110.

12 , S1140 is a step of recognizing a logo area by analyzing frame data (S1210), and a background image corresponding to the image of the area surrounding the logo area (meaning corresponding to the "estimated image" mentioned above) ) may include calculating (S1220) and displaying a background image in the logo area (S123).

When the above-described driving method is used, the logo 200 may not be intentionally displayed in at least one frame section between the frame sections in which the logo 200 is displayed. Accordingly, the logo 200 is not continuously displayed for a long time for a period of time sufficient to generate an afterimage, thereby preventing a logo afterimage.

According to the present embodiments as described above, it is possible to effectively prevent a logo afterimage.

In addition, according to the present embodiments, since the luminance of the logo area is not reduced, the logo afterimage can be prevented without reducing the luminance of the logo 200 and its surroundings.

The above description and the accompanying drawings are merely illustrative of the technical spirit of the present invention, and those of ordinary skill in the art to which the present invention pertains can combine configurations within a range that does not depart from the essential characteristics of the present invention. , various modifications and variations such as separation, substitution and alteration will be possible. Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

100: display device
110: display panel
120: data driver
130: scan driver
140: controller

Claims (16)

a display panel in which a plurality of sub-pixels defined by a plurality of data lines and a plurality of gate lines are arranged;
a data driver driving the plurality of data lines;
a scan driver driving the plurality of gate lines; and
A controller for controlling the data driver and the scan driver,
The display panel is
After displaying the frame screen in which the logo is displayed, the frame screen in which the logo is not displayed is displayed for N (N is a natural number greater than or equal to 1) frame period, and then the frame screen in which the logo is displayed is displayed again and
The controller is
Recognizing the logo area corresponding to the expression area of the logo on the frame screen by analyzing the frame data,
Outputs logo expression data that allows the logo to be expressed and logo non-expression data that allows the logo not to be expressed,
The logo non-expression data is estimated image data calculated based on image data for a region surrounding the logo. According to claim 1,
The controller is
Outputs the logo expression data on the frame screen corresponding to M (M is a natural number greater than or equal to 1) frame sections,
Thereafter, a display device for outputting the non-logo data on a frame screen corresponding to the N frame sections. 3. The method of claim 2,
The controller is
A display device for modulating the logo expression data included in the frame data for the N frame sections into the non-logo expression data and outputting them during the N frame sections. 4. The method of claim 3,
The controller is
By analyzing frame data for the N frame sections or previous frame sections of the N frame sections,
Recognizing the logo area in the frame screen corresponding to the N frame sections or the previous frame section,
Based on the image data for the surrounding area, generating estimated image data for the estimated image to be displayed in the logo area instead of the logo,
A display device that modulates the original logo expression data into the logo non-expression data by deleting image data corresponding to the logo in the logo area and adding the estimated image data. 5. The method of claim 4,
The controller is
A display device for generating an average value of the image data for the peripheral region as the estimated image data. delete 3. The method of claim 2,
The M value is the number of frames in which the logo is continuously displayed, and is a fixed value or a variable value. According to claim 1,
The N value is the number of frames in which the logo is not continuously displayed, and is a fixed value or a variable value. a logo recognition unit that analyzes frame data and recognizes a logo area corresponding to an expression area of a logo on a frame screen; and
On the basis of frame data for M (M is a natural number greater than or equal to 1) frame data, logo expression data for displaying the logo on a frame screen is output during the M frame periods, and then N (N is a natural number greater than or equal to 1) a logo expression control unit for outputting logo non-expression data for not displaying the logo on the frame screen during the N frame sections based on the frame data for the N frame sections,
The logo non-expression data is estimated image data corresponding to image data for a region surrounding the logo. 10. The method of claim 9,
The logo expression control unit,
A controller for a display device for modulating the logo expression data included in frame data for the N frame sections into the non-logo expression data and outputting the data during the N frame sections. 11. The method of claim 10,
The logo recognition unit,
By analyzing frame data for the N frame sections or previous frame sections of the N frame sections,
Recognizing the logo area in the frame screen corresponding to the N frame sections or the previous frame section,
The logo expression control unit,
Based on the image data for the surrounding area, generating estimated image data for the estimated image to be displayed in the logo area instead of the logo,
A controller for a display device for deleting the image data corresponding to the logo in the logo area and adding the estimated image data to modulate the original logo expression data into the logo non-expression data. delete A method of driving a display device, comprising:
A first step of displaying the original image on which the logo is expressed; and
A second step of displaying an image in which the logo is not displayed,
The second step is
Recognizing a logo area by analyzing frame data;
calculating a background image corresponding to an image of a region surrounding the logo region; and
and displaying the background image on the logo area. 14. The method of claim 13,
The first step and the second step are repeatedly performed,
Prior to the first step,
determining whether there is a logo displayed at a fixed position for a predetermined time or more, and determining whether there is a possibility of occurrence of a logo afterimage; and
The method of driving a display device further comprising the step of starting logo display control when it is determined that the logo displayed at a fixed position for a predetermined time or more exists and there is a possibility that a logo afterimage may occur. a display panel in which a plurality of sub-pixels defined by a plurality of data lines and a plurality of gate lines are arranged;
a data driver driving the plurality of data lines;
a scan driver driving the plurality of gate lines; and
A controller for controlling the data driver and the scan driver,
The display panel is
After displaying the frame screen in which the logo is displayed, the frame screen in which the logo is not displayed is displayed for N (N is a natural number greater than or equal to 1) frame period, and then the frame screen in which the logo is displayed is displayed again and
The controller is
Outputs logo expression data for displaying the logo on a frame screen corresponding to M (M is a natural number greater than or equal to 1) frame sections,
Thereafter, the logo non-expression data is output so that the logo is not displayed on the frame screen corresponding to the N frame sections,
Among the frame data before the logo expression graphic processing and the frame data after the logo expression graphic processing, which are stored in advance inside or outside as frame data for the M frame sections, based on the frame data after the logo expression graphic processing, the M Outputs the logo expression data during the frame period,
Then, from among the frame data before the logo expression graphic processing and the frame data after the logo expression graphic processing stored in advance inside or outside as frame data for the N frame sections, based on the frame data before the logo expression graphic processing, the A display device for outputting the non-logo data for N frame sections. a logo recognition unit that analyzes frame data and recognizes a logo area corresponding to an expression area of a logo on a frame screen; and
On the basis of frame data for M (M is a natural number greater than or equal to 1) frame data, logo expression data for displaying the logo on a frame screen is output during the M frame periods, and then N (N is a natural number greater than or equal to 1) a logo expression control unit for outputting logo non-expression data for not displaying the logo on the frame screen during the N frame sections based on the frame data for the N frame sections,
The logo expression control unit,
Among the frame data before the logo expression graphic processing and the frame data after the logo expression graphic processing, which are stored in advance inside or outside as frame data for the M frame sections, based on the frame data after the logo expression graphic processing, the M Outputs the logo expression data during the frame period,
Then, from among the frame data before the logo expression graphic processing and the frame data after the logo expression graphic processing stored in advance inside or outside as frame data for the N frame sections, based on the frame data before the logo expression graphic processing, the A controller for a display device that outputs the data without the logo being displayed during N frame sections.

Images