Display device and method of driving the same

Abstract

The present invention relates to a display apparatus and a method of driving the same. The display apparatus includes a pixel, an image converter that generates a second image by correcting a gray scale of a first logo in a first image of the pixel, and a data driver that provides a data signal corresponding to the second image to the pixel. The image converter detects the first logo based on a value and a saturation of the first image, generates first map data corresponding to the first logo, and specifies the pixel corresponding to the first logo based on the first map data.

Description

Technical Field

[0001] Embodiments of the present invention relate to a display device and a method for driving the display device. Background Technology

[0002] With the development of information technology, the importance of display devices as the connection medium between users and information has been emphasized. In view of this, the use of display devices such as liquid crystal displays, organic light-emitting diode displays, and plasma displays is increasing.

[0003] A display device may include multiple pixels and displays an image (frame) by combining the light emitted from the pixels. When multiple different images are displayed consecutively, a user may perceive the images as moving images. Conversely, when multiple identical images are displayed consecutively, a user may perceive the images as still images. Summary of the Invention

[0004] In display devices, pixel degradation and image retention can occur when a static image is displayed for an extended period, or when a portion of a moving image (such as a logo) is displayed at the same brightness for a prolonged period. In such display devices, the grayscale level of the logo can be corrected to prevent image retention.

[0005] An embodiment of the present invention relates to a display device in which a white logo and a colored logo displayed in a logo area are accurately extracted, and the grayscale level of the extracted logo is effectively corrected.

[0006] An embodiment of the display device according to the present invention includes: a pixel; an image converter that generates a second image by correcting the grayscale level of a first logo in a first image of the pixel; and a data driver that provides a data signal corresponding to the second image to the pixel. In such an embodiment, the image converter detects the first logo based on the value and saturation of the first image, generates first map data corresponding to the first logo, and designates the pixel corresponding to the first logo based on the first map data.

[0007] In an embodiment, the image converter can detect the second logo in the first image, generate second map data corresponding to the second logo, specify pixels corresponding to the second logo based on the second map data, and generate a second image by further correcting the grayscale level of the second logo.

[0008] In an embodiment, the image converter may include: a first logo detector that generates first sub-map data based on the values ​​of a first image, generates second sub-map data based on the saturation of the first image, and generates first map data by combining the first sub-map data and the second sub-map data; a second logo detector that generates second map data based on white markers in the first image; a logo determiner that generates third map data using the first map data and the second map data; and a grayscale converter that specifies pixels corresponding to the first logo and pixels corresponding to the second logo based on the third map data, and generates the second image by converting the grayscale levels of the pixels corresponding to the first logo and the pixels corresponding to the second logo in the first image.

[0009] In one embodiment, the first logo detector may include a coordinate converter that converts a first image in RGB color space coordinates into a third image in HSV color space coordinates.

[0010] In an embodiment, the first logo detector may further include: a first map data extractor that generates first sub-map data corresponding to regions in the third image that have a value equal to or greater than a threshold; and a second map data extractor that generates second sub-map data corresponding to regions in the third image that have a saturation level equal to or greater than a threshold saturation level.

[0011] In an embodiment, the first map data can be generated based on the intersection of the first sub-map data and the second sub-map data.

[0012] In one embodiment, the second logo detector can generate second map data corresponding to areas in the first image that have white markers equal to or greater than a threshold.

[0013] In this embodiment, the white marker may be a grayscale value of the first image.

[0014] In one embodiment, the second logo detector can generate second map data based on the values ​​of the first image.

[0015] In an embodiment, the third map data may be generated based on a combination of the first map data and the second map data.

[0016] In one embodiment, the first logo may include a colored mark, and the second logo may include a white mark.

[0017] In an embodiment, the first logo detector and the second logo detector can generate the first map data and the second map data based on the Otsu binarization method.

[0018] An embodiment of the method for driving a display device according to the present invention includes: detecting a first logo in a first image based on the value and saturation of a first image; generating first map data corresponding to the first logo; detecting a second logo in the first image based on white markers in the first image; generating second map data corresponding to the second logo; generating third map data using the first map data and the second map data; specifying pixels corresponding to the first logo and pixels corresponding to the second logo based on the third map data; and generating a second image by correcting the gray levels of the pixels corresponding to the first logo and the pixels corresponding to the second logo in the first image.

[0019] In an embodiment, generating the first map data may include: converting a first image in RGB color space coordinates into a third image in HSV color space coordinates; generating first sub-map data corresponding to regions in the third image that have a value equal to or greater than a threshold; generating second sub-map data corresponding to regions in the third image that have a saturation level equal to or greater than a threshold saturation level; and generating the first map data by combining the first sub-map data and the second sub-map data.

[0020] In an embodiment, the first map data can be generated based on the intersection of the first sub-map data and the second sub-map data.

[0021] In an embodiment, second map data can be generated corresponding to areas in the first image that have white markers equal to or greater than a threshold.

[0022] In this embodiment, the white marker may be a grayscale value of the first image.

[0023] In one embodiment, second map data can be generated based on the white markers and values ​​of the first image.

[0024] In an embodiment, the third map data may be generated based on a combination of the first map data and the second map data. Attached Figure Description

[0025] The above and other features of the invention will become more apparent from the further detailed description of embodiments thereof with reference to the accompanying drawings, in which:

[0026] Figure 1 This is a block diagram illustrating a display device according to an embodiment of the present invention;

[0027] Figure 2 It is a diagram. Figure 1 A circuit diagram of an embodiment of pixels included in a display device;

[0028] Figure 3 This is a diagram illustrating an embodiment of the first image, the logo area, the first logo, and the second logo;

[0029] Figure 4 It is a diagram. Figure 1 A block diagram of an embodiment of an image converter included in a display device;

[0030] Figure 5 It is a diagram. Figure 4 A block diagram of an embodiment of a first logo detector included in an image converter;

[0031] Figure 6A and Figure 6B It is shown by Figure 5 A diagram of an embodiment of the first sub-map data generated by the first map data extractor included in the first logo detector;

[0032] Figure 7A and Figure 7B It is shown by Figure 5 A diagram of an embodiment of second sub-map data generated by a second map data extractor included in a first logo detector;

[0033] Figure 8 It is shown by Figure 5 An example of the first map data generated by the map data generator included in the first logo detector;

[0034] Figure 9A and Figure 9B It is shown by Figure 4 An example of a diagram of second map data generated by a second logo detector included in an image converter; and

[0035] Figure 10 It is shown by Figure 4 An example of a third map data generated by a logo determiner included in an image converter. Detailed Implementation

[0036] The invention will now be described more fully below with reference to the accompanying drawings, in which various embodiments are illustrated. However, the invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. The same reference numerals throughout refer to the same elements.

[0037] It will be understood that although the terms “first,” “second,” “third,” etc., may be used herein to describe various elements, components, areas, layers, and / or parts, these elements, components, areas, layers, and / or parts should not be limited by these terms. These terms are used only to distinguish one element, component, area, layer, or part from another. Therefore, “first element,” “first component,” “first area,” “first layer,” or “first part” discussed below may be referred to as a second element, second component, second area, second layer, or second part without departing from the teachings herein.

[0038] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used herein, unless the context clearly indicates otherwise, “a,” “the,” and “at least one” do not refer to a limitation of quantity and are intended to include both the singular and the plural. For example, unless the context clearly indicates otherwise, “an element” has the same meaning as “at least one element.” “At least one” should not be construed as limiting “a.” “Or” means “and / or.” As used herein, the term “and / or” includes any and all combinations of one or more of the associated listed items. It will be further understood that, when used in this specification, the terms “comprising” or “including” specify the presence of the stated features, areas, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, areas, integrals, steps, operations, elements, components, and / or groups thereof.

[0039] Furthermore, when a component is "coupled to" or "connected to" another component, this includes not only cases where the component is directly coupled to or connected to another component, but also cases where the other component is coupled to or connected in between them. Conversely, when a component is said to be "directly coupled to" or "directly connected to" another component, there is no intermediate component.

[0040] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. It will be further understood that terms such as those defined in common dictionaries shall be interpreted as having meanings consistent with their meanings in the relevant field and in the context of this disclosure, and shall not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0041] The embodiments described herein should not be construed as limited to the specific shapes of the regions illustrated herein, but should include, for example, deviations in shape due to manufacturing processes. For instance, regions illustrated or described as flat may typically have rough and / or non-linear characteristics. Furthermore, acute angles illustrated may be rounded. Therefore, the regions illustrated in the figures are schematic in nature, and their shapes are not intended to illustrate precise shapes of regions, nor are they intended to limit the scope of the claims.

[0042] In the following, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0043] Figure 1 This is a block diagram illustrating a display device according to an embodiment of the present invention.

[0044] Reference Figure 1 An embodiment of the display device 1000 according to the present invention may include a timing controller 100, a data driver 200, a scan driver 300, a pixel unit 400 (or a display panel) and an image converter 500.

[0045] The timing controller 100 can receive grayscale levels and control signals for each first image (frame) from an external processor. In one embodiment, for example, when displaying a still image, the grayscale levels of successive first images may be substantially the same as each other. In another embodiment, for example, when displaying a moving image, the grayscale levels of successive first images may be substantially different from each other. In such an embodiment, a portion of the moving image may be a still area such as a logo.

[0046] The image converter 500 can generate a second image by correcting the grayscale level of the logo in the first image.

[0047] In one embodiment, the image converter 500 may generate (or extract) map data corresponding to a logo area larger than the logo in the first image, and use the generated map data to correct the grayscale level of the logo.

[0048] In one embodiment, for example, image converter 500 can generate first map data corresponding to a first logo in a first image, including color markings. In such an embodiment, image converter 500 can generate second map data corresponding to a second logo in the first image, including white markings. In such an embodiment, image converter 500 can use the first and second map data to generate third map data. Image converter 500 can specify (determine or select) pixels corresponding to logos (e.g., the first logo and / or the second logo) based on the third map data. In such an embodiment, image converter 500 can generate a second image by correcting the grayscale levels of the pixels specified as corresponding to the logos.

[0049] The timing controller 100 can provide the grayscale levels of the second image to the data driver 200. In an embodiment, the timing controller 100 can provide control signals suitable for each specification to the data driver 200 or the scan driver 300, etc., to display the second image.

[0050] In an embodiment, such as Figure 1 As shown, the timing controller 100 and the image converter 500 may be separate components. However, this is merely exemplary, and the timing controller 100 and the image converter 500 may be configured as a single unit. In one embodiment, for example, the image converter 500 may be implemented in a form that is embedded within the timing controller 100.

[0051] The data driver 200 can provide data signals corresponding to the second image to the pixels. In one embodiment, for example, the data driver 200 can use the grayscale levels of the second image and control signals to generate data signals to be provided to data lines DL1, DL2, DL3, ..., DLn. In another embodiment, for example, the data driver 200 can use a clock signal to sample the grayscale levels and apply the data signals corresponding to the grayscale levels to data lines DL1 to DLn on a per-pixel-row basis. A pixel row can refer to pixels connected to the same scan line, where n can be an integer greater than 0.

[0052] The scan driver 300 can receive clock signals or scan start signals from the timing controller 100 and generate scan signals to be provided to scan lines SL1, SL2, SL3, ... and SLm, where m can be an integer greater than 0.

[0053] The scan driver 300 can sequentially supply scan signals with on-level pulses to scan lines SL1 to SLm. In one embodiment, for example, the scan driver 300 may include scan stages configured in the form of shift registers. The scan driver 300 can generate scan signals by sequentially transmitting scan start signals in the form of on-level pulses to the next scan stage based on a clock signal.

[0054] Pixel unit 400 may include pixels PXij. Each pixel PXij may be connected to a corresponding data line and a corresponding scan line, where i and j can be integers greater than 0. Pixel PXij may refer to a pixel whose scan transistor is connected to the i-th scan line and the j-th data line. In an embodiment, each pixel PXij may receive voltages from a first power supply VDD and a second power supply VSS externally. Here, the first power supply VDD and the second power supply VSS may be voltages used for pixel operation. In one embodiment, for example, the first power supply VDD may have a voltage level higher than that of the second power supply VSS.

[0055] Figure 2 It is a diagram. Figure 1 A circuit diagram of an embodiment of the pixel PXij included in the display device 1000.

[0056] Reference Figure 2 An embodiment of the pixel PXij may include a light-emitting element LD and a driving circuit DC connected to the light-emitting element LD to drive the light-emitting element LD.

[0057] The first electrode (e.g., the anode electrode) of the light-emitting element LD can be connected to a first power supply VDD via a drive circuit DC, and the second electrode (e.g., the cathode electrode) of the light-emitting element LD can be connected to a second power supply VSS. The light-emitting element LD can emit light with a brightness corresponding to the amount of drive current controlled by the drive circuit DC.

[0058] The light-emitting element (LD) may include or be composed of organic light-emitting diodes (OLEDs). Alternatively, the light-emitting element (LD) may include, or be composed of, inorganic light-emitting diodes such as micro-LEDs (“LEDs”) or quantum dot LEDs. Alternatively, the light-emitting element (LD) may be an element comprising organic and inorganic materials, or an element composed of organic and inorganic materials. In embodiments, such as Figure 2 As shown, pixel PXij includes a single light-emitting element LD. However, in alternative embodiments, pixel PXij may include multiple light-emitting elements, and the multiple light-emitting elements may be connected to each other in series, parallel, or a combination of series and parallel.

[0059] The first power supply VDD and the second power supply VSS can have different potentials than each other. In one embodiment, for example, the voltage applied through the first power supply VDD can be greater than the voltage applied through the second power supply VSS.

[0060] The driving circuit DC may include a first transistor T1, a second transistor T2, and a storage capacitor Cst.

[0061] The first electrode of the first transistor T1 (driving transistor) can be connected to the first power supply VDD, and the second electrode of the first transistor T1 can be electrically connected to the first electrode (e.g., the anode electrode) of the light-emitting element LD. The gate electrode of the first transistor T1 can be connected to the first node N1. The first transistor T1 can control the amount of driving current supplied to the light-emitting element LD in response to a data signal supplied to the first node N1 via the data line DLj.

[0062] The first electrode of the second transistor T2 (switching transistor) can be connected to the data line DLj, and the second electrode of the second transistor T2 can be connected to the first node N1. The gate electrode of the second transistor T2 can be connected to the scan line SLi.

[0063] When a scan signal with a conduction level voltage (at which the second transistor T2 conducts) (e.g., gate conduction voltage) is supplied from scan line SL1, the second transistor T2 can conduct, and therefore, data line DLj and the first node N1 can be electrically connected. When the second transistor T2 is conducting, the data signal of the corresponding frame can be supplied to data line DLj, and accordingly, the data signal can be transmitted to the first node N1. The voltage corresponding to the data signal transmitted to the first node N1 can be stored in the storage capacitor Cst.

[0064] One electrode of the storage capacitor Cst can be connected to the first node N1, and the other electrode of the storage capacitor Cst can be connected to the first electrode of the light-emitting element LD. The storage capacitor Cst can be charged with a voltage corresponding to the data signal supplied to the first node N1, and can maintain this charged voltage until the data signal of the next frame is supplied.

[0065] For ease of illustration and description, Figure 2 An embodiment of a pixel PXij with a relatively simple structure is shown. However, the structure of the driving circuit DC can be varied or modified. In an alternative embodiment, for example, the driving circuit DC may include various transistors, such as a compensation transistor for compensating the threshold voltage of the first transistor T1, an initialization transistor for initializing the first node N1, and / or a light emission control transistor for controlling the emission time of the light-emitting element LD. In an alternative embodiment, the driving circuit DC may further include other circuit elements, such as a boost capacitor for boosting the voltage of the first node N1.

[0066] In an embodiment, such as Figure 2 As shown, the transistors (e.g., the first transistor T1 and the second transistor T2) included in the driving circuit DC can be N-type transistors, but the present invention is not limited thereto. Alternatively, at least one of the first transistor T1 and the second transistor T2 included in the driving circuit DC can be a P-type transistor.

[0067] Figure 3 This is a diagram illustrating an embodiment of a first image, a logo area, a first logo, and a second logo.

[0068] Reference Figure 1 and Figure 3 , Figure 3An embodiment is shown in which pixel unit 400 displays, for example, a first image IMG1. The first image IMG1 may be data including grayscale levels for each pixel in the pixel unit 400. Here, one first image IMG1 may correspond to one frame. In this document, the period during which a first image IMG1 is displayed may be referred to as a frame period. In such an embodiment, the start and end times of the frame period may be different for each pixel row. In one embodiment, for example, the time point when the scan transistor of the pixel row is turned on to receive the data signal corresponding to the current first image IMG1 may be the start time point of the frame period for the pixel row, and the time point when the scan transistor is turned on again to receive the data signal corresponding to the next first image IMG1 may be the end time point of the frame period for the corresponding pixel row.

[0069] The logo area LGA (or the area including the first logo LG1 and / or the second logo LG2) can be a still image area in which the position and grayscale level are maintained in a continuous first image IMG1. In one embodiment, for example, the first logo LG1 can be a logo including colored markers, and the second logo LG2 can be a logo including white markers. In such an embodiment, the first logo LG1 can be positioned around the second logo LG2 (e.g., Figure 3 The letter "S" shown is in part of the form shown.

[0070] The logo area LGA may include a first logo LG1 and a second logo LG2, and may be an area larger than the first logo LG1 and the second logo LG2. In one embodiment, for example, the logo area LGA may be a rectangular area, such that the logo area LGA can be easily defined using coordinate values ​​based on the x-axis and y-axis. In an alternative embodiment, the logo area LGA may be defined as other shapes such as circles or ellipses. The area within the logo area LGA other than the first logo LG1 and the second logo LG2 may be defined as the background.

[0071] Figure 4 It is a diagram. Figure 1 A block diagram of an embodiment of an image converter 500 included in a display device 1000. Figure 5 It is a diagram. Figure 4 A block diagram of an embodiment of the first logo detector included in the image converter. Figure 6A and Figure 6B It is shown by Figure 5 A diagram of an embodiment of the first sub-map data generated by the first map data extractor included in the first logo detector. Figure 7A and Figure 7B It is shown by Figure 5A diagram illustrating an embodiment of second sub-map data generated by a second map data extractor included in a first logo detector. Figure 8 It is shown by Figure 5 The first logo detector includes a map data generator that generates the first map data, which is an example of a first map data. Figure 9A and Figure 9B It is shown by Figure 4 An example of a second map data generated by a second logo detector included in an image converter. Figure 10 It is shown by Figure 4 An example of a third map data generated by a logo determiner included in an image converter.

[0072] Reference Figure 3 and Figure 4 An embodiment of the image converter 500 according to the present invention may include a first logo detector 510, a second logo detector 520, a logo determiner 530, and a grayscale converter 540.

[0073] In an embodiment, the image converter 500 can generate (or extract) map data (first map data to third map data LMR1, LMR2 and LMF) corresponding to the logo area LGA in the first image IMG1, and use the generated map data LMR1, LMR2 and LMF to correct the grayscale level of the first logo LG1 and / or the second logo LG2.

[0074] In one embodiment, for example, image converter 500 can generate first map data LMR1 corresponding to a first logo LG1 including color markings in a first image IMG1. In such an embodiment, image converter 500 can generate second map data LMR2 corresponding to a second logo LG2 including white markings in the first image IMG1. In such an embodiment, image converter 500 can use the first map data LMR1 and the second map data LMR2 to generate third map data LMF. Image converter 500 can specify pixels corresponding to the first logo LG1 and / or the second logo LG2 based on the third map data LMF. In an embodiment, image converter 500 can generate the second image IMG2 by correcting the grayscale levels of the pixels specified as corresponding to the first logo LG1 and / or the second logo LG2.

[0075] The first logo detector 510 can detect the first logo LG1 in the first image IMG1 and generate first map data LMR1 corresponding to the first logo LG1.

[0076] In an embodiment, the first logo detector 510 can convert the first image IMG1 from RGB color space coordinates to HSV color space coordinates to detect the first logo LG1, which includes a color mark, and detect the first logo LG1 based on the value (or brightness) and saturation of the logo region LGA in the converted first image IMG1 (hereinafter referred to as the third image).

[0077] Reference Figure 5 An embodiment of the first logo detector 510 may include a coordinate converter 511, a first map data extractor 512, a second map data extractor 513, and a map data generator 514.

[0078] The coordinate converter 511 can convert the first image IMG1 in RGB color space coordinates into a third image IMG1_1 in HSV color space coordinates. In an embodiment, the display device (e.g., Figure 1 Each pixel of the display device 1000 shown (e.g., Figure 2 The pixel PXij shown may include sub-pixels emitting red light, sub-pixels emitting green light, and sub-pixels emitting blue light. In such an embodiment, the first image IMG1 may be expressed in RGB color space coordinates of red, green, and blue. In such an embodiment, the coordinate converter 511 can generate a third image IMG1_1 with HSV color space coordinates of hue, saturation, and value (or brightness) by transforming the first image IMG1 in RGB color space coordinates, in order to detect the first logo LG1 including color markings.

[0079] The first map data extractor 512 can generate (or extract) the first sub-map data LMD1 based on the third image IMG1_1 in HSV color space coordinates.

[0080] In an embodiment, the first map data extractor 512 can generate first sub-map data LMD1 based on regions in the logo area LGA that have values ​​equal to or greater than a predetermined threshold.

[0081] In one embodiment, for example, such as Figure 6A and Figure 6B As shown, the first map data extractor 512 can generate [data] by extracting pixels with a value of 714 or greater as a threshold Vth (or threshold brightness) from the logo area LGA. Figure 6B The first sub-map data LMD1 is shown in the diagram. Here, the threshold Vth can be a value predetermined through experimentation, etc. The value of 714 is merely an example, and the threshold Vth is not limited to this.

[0082] In one embodiment, the first logo LG1, including a color marker, and the second logo LG2, including a white marker, can have high values. In such an embodiment, when a relatively bright image is displayed in the logo region LGA (excluding the first logo LG1 and the second logo LG2) based on the image displayed by the first image IMG1, the values ​​in the corresponding regions may be high. In this case, on the first sub-map data LMD1, the pixels corresponding to the first logo LG1 and the pixels corresponding to the second logo LG2, and / or the regions displaying bright images (or noise regions NS) can be extracted as pixels with a threshold Vth or higher value.

[0083] The second map data extractor 513 can generate (or extract) the second sub-map data LMD2 based on the third image IMG1_1 with HSV color space coordinates.

[0084] In an embodiment, the second map data extractor 513 can generate second sub-map data LMD2 based on regions in the logo area LGA that have a saturation level equal to or greater than a predetermined threshold saturation level.

[0085] In one embodiment, for example, such as Figure 7A and Figure 7B As shown, the second map data extractor 513 can generate [data] by extracting pixels with a saturation of 0.5 or greater as a threshold saturation Sth from the logo area LGA. Figure 7B The second sub-map data, LMD2, is shown here. The threshold saturation Sth can be a predetermined value determined through experimentation, etc. The value of 0.5 is merely an example, and the threshold saturation Sth is not limited to this.

[0086] In an embodiment, in the image displayed by the first image IMG1, in addition to the first logo LG1 including the color marker, a high-saturation image can be displayed in the area (or background) of the logo region LGA, excluding the first logo LG1 and the second logo LG2. In this case, on the second sub-map data LMD2, the pixels corresponding to the first logo LG1 and the pixels corresponding to the area (or noise region NS) displaying the high-saturation image can be extracted as pixels with a threshold saturation Sth or higher.

[0087] Map data generator 514 can generate first map data LMR1 corresponding to the first logo LG1 by detecting the first logo LG1 including the color mark.

[0088] In one embodiment, map data generator 514 can generate first map data LMR1 using first sub-map data LMD1 and second sub-map data LMD2. In one embodiment, for example, since the first logo LG1 displayed in the logo area LGA includes color markers, the value and saturation of the first logo LG1 can be relatively high. Map data generator 514 can generate the first map data LMR1 by combining the first sub-map data LMD1 and the second sub-map data LMD2. Figure 8 The first map data LMR1. In one embodiment, for example, such as Figure 8 As shown, the first map data LMR1 can be generated based on the intersection of the first sub-map data LMD1 and the second sub-map data LMD2, or in the form of the intersection of the first sub-map data LMD1 and the second sub-map data LMD2. Therefore, on the first map data LMR1, pixels corresponding to the first logo LG1 that are greater than or equal to a threshold Vth and greater than or equal to a threshold saturation Sth can be extracted. In such an embodiment, since the first sub-map data LMD1 and the second sub-map data LMD2 are combined in the form of an intersection to generate the first map data LMR1, only pixels other than noise regions (e.g., Figure 6A and / or Figure 7A The pixels corresponding to the first logo LG1 outside the noise region NS shown can be accurately extracted onto the first map data LMR1.

[0089] Return to reference Figure 4 The second logo detector 520 can generate second map data LMR2 corresponding to the second logo LG2 by detecting the second logo LG2 in the first image IMG1.

[0090] In an embodiment, the second logo detector 520 can generate second map data LMR2 based on areas with white markings equal to or greater than a predetermined threshold to detect a second logo LG2 including white markings.

[0091] In one embodiment, for example, such as Figure 9A and Figure 9B As shown, the second logo detector 520 can generate a white mark with a white mark of 714 or greater as a threshold white mark Wth within the logo region LGA. Figure 9B The second map data, LMR2, is shown here. The threshold white marker Wth can be a predetermined value determined through experimentation, etc. The value of 714 is merely an example, and the threshold white marker Wth is not limited to this.

[0092] In this embodiment, the white marker may be the grayscale value of the first image IMG1.

[0093] In one embodiment, the second logo detector 520 can generate second map data LMR2 using values ​​and white markers. In one embodiment, for example, the second logo detector 520 can generate the second map data LMR2 by extracting pixels in the logo region LGA that have a white marker value of 714 or greater as a threshold white marker Wth and a value of 714 or greater as a threshold Vth. Since the second logo LG2, including the white marker, is displayed as a relatively bright image, the accuracy of extracting the second logo LG2 can be further improved when the second logo detector 520 generates the second map data LMR2 using values ​​and white markers.

[0094] In one embodiment, the first logo detector 510 and the second logo detector 520 can use conventional logo detection algorithms to extract the first logo LG1 and the second logo LG2. In one embodiment, for example, a logo detection algorithm using the Otsu binarization method can be performed. The Otsu binarization method is an adaptive thresholding method used for binarization in image processing, which is well known in the art.

[0095] Logo determiner 530 can generate third map data LMF using first map data LMR1 and second map data LMR2. In one embodiment, for example, logo determiner 530 can generate the third map data LMF by extracting pixels corresponding to the first logo LG1 extracted from the first map data LMR1 and pixels corresponding to the second logo LG2 extracted from the second map data LMR2 as pixels corresponding to the logo. In one embodiment, for example, as... Figure 10 As shown, the third map data LMF can be generated as the union of the first map data LMR1 and the second map data LMR2 (or a combination based on the first map data LMR1 and the second map data LMR2). In such an embodiment, since the first map data LMR1 and the second map data LMR2 are combined in the form of a union to generate the third map data LMF, all pixels corresponding to the first logo LG1 and the second logo LG2 can be extracted from the third map data LMF.

[0096] The grayscale converter 540 can specify the pixels corresponding to the first logo LG1 and the second logo LG2 based on the third map data LMF, and can generate the second image IMG2 by converting the grayscale level of the specified pixels in the first image IMG1.

[0097] The grayscale converter 540 can generate the second image IMG2 by reducing the grayscale level of the pixels corresponding to the first logo LG1 and the second logo LG2 in the first image IMG1. Therefore, the brightness of the light emitted from the pixels corresponding to the first logo LG1 and the second logo LG2 can be reduced during consecutive frame periods to prevent image retention.

[0098] In embodiments of the present invention, as referred to above... Figure 4 and Figure 5 As described, the image converter 500 can accurately extract the first logo LG1 and the second logo LG2 of the logo region LGA, and correct the grayscale levels of the pixels in the logo region LGA corresponding to the first logo LG1, which includes a color mark, and the second logo LG2, which includes a white mark. Therefore, pixel degradation and ghosting in the logo region LGA can be removed (or reduced).

[0099] According to embodiments of the display device of the present invention, the colored logo and the white logo displayed in the logo area can be accurately extracted, and the grayscale level of the extracted logo can be corrected. Therefore, pixel degradation and image retention in the logo area LGA can be removed (or reduced).

[0100] This invention should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art.

[0101] Although the invention has been specifically shown and described with reference to embodiments thereof, those skilled in the art will understand that various changes in form and detail may be made in the invention without departing from the spirit or scope of the invention as defined by the appended claims.

Claims

1. A display device, comprising: Pixel; An image converter generates a second image by correcting the grayscale level of a first logo in a first image of the pixels; and The data driver provides a data signal corresponding to the second image to the pixel. Specifically, the image converter detects the first logo based on the brightness and saturation of the first image, generates first map data corresponding to the first logo, and specifies the pixels corresponding to the first logo based on the first map data. The image converter includes: A first logo detector generates first sub-map data based on the brightness of the first image, generates second sub-map data based on the saturation of the first image, and generates the first map data by combining the first sub-map data and the second sub-map data. The first logo detector includes: A coordinate converter transforms the first image in RGB color space coordinates into a third image in HSV color space coordinates. A first map data extractor generates first sub-map data corresponding to regions in the third image with brightness equal to or greater than a threshold brightness; and The second map data extractor generates second sub-map data corresponding to regions in the third image that have a saturation level equal to or greater than a threshold saturation level.

2. The display device according to claim 1, wherein, The image converter detects the second logo in the first image, generates second map data corresponding to the second logo, specifies the pixels corresponding to the second logo based on the second map data, and generates the second image by further correcting the grayscale level of the second logo.

3. The display device according to claim 2, wherein, The image converter further includes: A second logo detector generates the second map data based on the white markers in the first image; Logo determiner, generating third map data using the first map data and the second map data; and A grayscale converter specifies the pixel corresponding to the first logo and the pixel corresponding to the second logo based on the third map data, and generates the second image by converting the grayscale levels of the pixels corresponding to the first logo and the pixels corresponding to the second logo in the first image.

4. The display device according to claim 3, wherein, The first map data is generated based on the intersection of the first sub-map data and the second sub-map data.

5. The display device according to claim 3, wherein, The second logo detector generates second map data corresponding to the regions in the first image that have white markers equal to or greater than a threshold.

6. The display device according to claim 5, wherein, The white marker is the grayscale value of the first image.

7. The display device according to claim 3, wherein, The second logo detector generates the second map data based on the brightness of the first image.

8. A method for driving a display device, the method comprising: Detect the first logo in the first image based on the brightness and saturation of the first image; Generate first map data corresponding to the first logo; Detect the second logo in the first image based on the white marker in the first image; Generate second map data corresponding to the second logo; Generate third map data using the first map data and the second map data; The third map data is used to specify the pixels corresponding to the first logo and the pixels corresponding to the second logo; and The second image is generated by correcting the gray levels of the pixels in the first image corresponding to the first logo and the pixels corresponding to the second logo. The generation of the first map data includes: Convert the first image into a third image; Generate first sub-map data corresponding to regions in the third image with brightness equal to or greater than a threshold brightness; Generate second sub-map data corresponding to regions in the third image with a saturation level equal to or greater than a threshold saturation level; and The first map data is generated by combining the first sub-map data and the second sub-map data.

Images