Display device

Abstract

A display device can include a ghost detection section configured to detect first data of a ghost region from image data, a saturation adjustment section configured to adjust a saturation of the first data of the ghost region detected by the ghost detection section and convert the first data into second data, and a display panel including a plurality of pixels configured to display data including the second data output from the saturation adjustment section.

Description

[0001] Cross-reference to related applications

[0002] This application claims priority to Korean Patent Application No. 10-2022-0040628, filed on March 31, 2022, the entire contents of which are expressly incorporated herein by reference. Technical Field

[0003] This invention relates to a display device. Background Technology

[0004] Various display devices have been developed. Among these, electroluminescent display devices are widely used.

[0005] Among electroluminescent display devices, organic light-emitting display devices use self-emissive elements, thus eliminating the need for a separate light source. Furthermore, organic light-emitting display devices offer advantages such as low power consumption, thin profile, wide viewing angle, and fast response time.

[0006] Organic light-emitting display devices can include multiple pixels and can display images of various colors through these pixels. For example, an organic light-emitting display device can display an image by providing a predetermined current to multiple pixels according to image data. The organic light-emitting elements included in an organic light-emitting display device can degrade due to electrical stress and the passage of emission time. Degradation of the organic light-emitting elements can lead to the problem of afterimages, where the image appears to remain even when no image is output. However, if the brightness is adjusted to solve the afterimage problem, brightness deviations may occur, which, due to the non-uniformity of brightness, can degrade image quality or cause afterimage limitation. Summary of the Invention

[0007] The inventors of this invention recognized the problems and other limitations associated with related technologies and conducted various experiments to address the persistence limitation without degrading image quality. Through these experiments, the inventors of this invention have developed an improved display device that can address or minimize the persistence limitation without degrading image quality.

[0008] One aspect of the present invention is to provide a display device that can resolve or minimize the persistence of image without degrading image quality.

[0009] Another aspect of the present invention is to provide a display device that can solve the pervasive image limitation and improve lifespan without degrading image quality.

[0010] Therefore, embodiments of the present invention aim to provide a device that fundamentally solves one or more problems caused by the limitations and disadvantages of related technologies.

[0011] Additional features and aspects of the invention will be set forth in the following description, will become apparent in part from the description, or may be learned by practice of the inventive concept provided herein. Other features and aspects of the inventive concept may be realized and obtained by means of structures specifically pointed out in the written description or its derivatives, the claims, and the drawings.

[0012] To achieve these and other aspects of the inventive concept, as embodied and broadly described herein, a display device includes: a ghost image detection unit configured to detect first data of a ghost image region from image data; a saturation adjustment unit configured to adjust the saturation of the first data of the ghost image region detected by the ghost image detection unit and convert the first data into second data; and a display panel including a plurality of pixels configured to display data including the second data output from the saturation adjustment unit.

[0013] In another aspect of the invention, a display device includes: a display panel comprising a plurality of pixels; a controller configured to receive image data, detect first data of a persistent image region from the image data by using data differences of each pixel accumulated between adjacent frames, adjust a saturation correction value based on the first data of the persistent image region, correct the first data of the persistent image region to second data based on the saturation correction value, and provide output data including the second data; and a circuit unit configured to provide data signals to the plurality of pixels based on the output data provided from the controller.

[0014] Other systems, methods, features, and advantages will become apparent to those skilled in the art upon study of the accompanying drawings and detailed description. All such additional systems, methods, features, and advantages are intended to be included in this specification, fall within the scope of the invention, and are protected by the appended claims. Nothing in this section should be construed as limiting the scope of the claims. Further aspects and advantages are discussed below in conjunction with various aspects of the invention.

[0015] It will be understood that the foregoing general description and the following detailed description of the invention are exemplary and explanatory, and are intended to provide further explanation of the claimed invention. Attached Figure Description

[0016] The accompanying drawings, which provide a further understanding of the invention and are incorporated in and form a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0017] Figure 1 The illustration shows a display device according to an embodiment of the present invention.

[0018] Figure 2 This is a block diagram illustrating the structure of an image processor in a display device according to an embodiment of the present invention.

[0019] Figure 3 The figure illustrates an image processing method for a display device according to an embodiment of the present invention.

[0020] Figures 4A to 4C The diagram illustrates the afterimage detection method according to an embodiment of the present invention.

[0021] Figure 5 An image processing method for a display device according to another embodiment of the present invention is illustrated.

[0022] Figure 6 An image processing method for a display device according to another embodiment of the present invention is illustrated.

[0023] Figure 7 An image processing method for a display device according to another embodiment of the present invention is illustrated.

[0024] Figure 8 This is a block diagram illustrating the structure of an image processor in a display device according to another embodiment of the present invention.

[0025] Figures 9A to 9F The saturation reduction method according to an embodiment of the present invention is illustrated.

[0026] Figures 10A to 10F A saturation reduction method according to another embodiment of the present invention is illustrated.

[0027] Figure 11 An example of the brightness of a sub-pixel according to an embodiment of the present invention is illustrated.

[0028] Figure 12 The diagram illustrates the color difference between data before and after saturation reduction according to an embodiment of the present invention.

[0029] Throughout the accompanying drawings and detailed description, unless otherwise specified, the same reference numerals should be understood to refer to the same elements, features, and structures. The relative dimensions and illustrations of these elements may be exaggerated for clarity, illustrative purposes, and convenience. Detailed Implementation

[0030] The invention will now be described in detail with reference to embodiments thereof, some of which are illustrated in the accompanying drawings. In the following description, detailed descriptions of well-known functions or constructions relevant herein will be omitted where it is determined that such detailed descriptions would unnecessarily obscure the essential points of the inventive concept. The described process steps and / or operations are exemplary; however, the order of steps and / or operations is not limited to those set forth herein, but may be varied as is known in the art, unless the steps and / or operations must occur in a particular order. The same reference numerals refer to the same elements throughout. The names of the elements used in the following explanation have been chosen solely for ease of writing and may differ from those used in actual products.

[0031] The advantages and features of the invention, as well as its implementation methods, will be illustrated by the following embodiments described with reference to the accompanying drawings. However, the invention may be embodied in 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.

[0032] The shapes, dimensions, proportions, angles, and quantities disclosed in the accompanying drawings to describe various embodiments of the invention are merely examples, and the invention is not limited to the details shown. Similar reference numerals refer to similar elements throughout. In the following description, detailed descriptions of related known functions or constructions will be omitted where it is determined that such detailed descriptions would unnecessarily obscure the focus of the invention. When "comprising," "having," and "including" are used in this specification, additional terms may be added unless "only" is used.

[0033] When interpreting an element, even if there is no explicit statement about the range of error or tolerance, the element should be interpreted as including such a range of error or tolerance.

[0034] When describing positional relationships, for example, when the positional relationship between two parts is described as "on," "above," "below," and "after," one or more other parts may be placed between these two parts, unless more restrictive terms such as "exactly" or "directly" are used. When describing implementation methods, when a structure is described as being "above" or "below" another structure, this description should be interpreted to include situations where the two structures are in contact with each other and situations where a third structure is placed between them.

[0035] When describing temporal relationships, such as when time sequence is described as “after,” “following,” “next,” and “before,” discontinuous situations may be included unless more restrictive terms such as “exactly,” “immediately after,” or “directly” are used.

[0036] It will be understood that although the terms "first," "second," etc., may be used herein to describe various elements, these elements should not be limited by these terms. These terms are merely used to distinguish one element from another. For example, without departing from the scope of the invention, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element.

[0037] In describing the elements of the present invention, the terms “first,” “second,” “A,” “B,” “(a),” “(b),” etc., may be used. These terms are intended to distinguish the corresponding element from other elements, and the basis, order, sequence, or number of the corresponding elements are not limited by these terms. When an element or layer and another element or layer are described as “connected,” “joined,” or “adhered,” it may be directly connected or adhered to the other element or layer, or indirectly connected or adhered to the other element or layer provided that one or more intermediate elements or layers are disposed or inserted between these elements or layers, unless otherwise specified.

[0038] The term "at least one" should be understood to include any and all combinations of one or more of the relevant listed items. For example, "at least one of the first, second, and third items" means a combination of all items proposed from two or more of the first, second, and third items, as well as the first, second, or third item.

[0039] As will be fully understood by those skilled in the art, the features of the various embodiments of the present invention can be combined or integrated with each other, either partially or entirely, and can be technically interoperable and driven in various ways. The various embodiments of the present invention can be implemented independently of each other, or can be implemented together in an interdependent relationship.

[0040] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. All components of each display device according to all embodiments of the present invention are operatively connected and configured. Furthermore, for ease of explanation, the scale, size, and thickness of each element shown in the drawings differ from the actual scale, size, and thickness; therefore, embodiments of the present invention are not limited to the scale, size, and thickness shown in the drawings.

[0041] Figure 1 The illustration shows a display device according to an embodiment of the present invention.

[0042] The display device according to one or more embodiments of the present invention may be a liquid crystal display device, an electroluminescent display device, etc. The electroluminescent display device may be an organic light-emitting display device, a quantum dot display device, an inorganic light-emitting display device, etc. Hereinafter, an organic light-emitting display device will be described as an example.

[0043] Reference Figure 1The display device according to an embodiment of the present invention may include a system board 1 and a display module 10.

[0044] The system board 1 may include an image providing unit 11. The image providing unit 11 can provide image data.

[0045] The display module 10 according to an embodiment of the present invention may include a display panel 110 and a timing controller 120. For example, the display module 10 may include: a display panel 110 including a plurality of pixels PXL; a data driver 140 for driving data lines 14; a gate driver 130 for driving gate lines 15; and a timing controller 120 for controlling the driving timing of the data driver 140 and the gate driver 130.

[0046] The display panel 110 may include a display area and a non-display area. The non-display area may be an area in which no image is displayed. The non-display area may be a border area, but is not limited to this.

[0047] The display panel 110 may include a pixel array in a pixel region (or display area) formed by data lines 14 and / or gate lines 15. The pixel array may include multiple pixels PXL configured to display an image. For example, the display area may be an area where multiple pixels PXL are configured to display an image. Each pixel PXL includes multiple subpixels. Each subpixel may include a light-emitting element and driving circuitry for independently driving the light-emitting element. The arrangement shape of each subpixel in each pixel region is not limited to a matrix shape; it may be arranged differently, such as a stripe shape, a shared pixel shape, etc.

[0048] For example, each sub-pixel can be connected to a data line 14, at least one or more scan lines, and an emission control line. A high-potential voltage ELVDD, a low-potential voltage ELVSS, and a reference voltage Vref can be provided to the sub-pixels from the power generator. The reference voltage Vref can fall within a voltage range sufficiently lower than the operating voltage of the light-emitting element to prevent unnecessary emission of the light-emitting element during the initialization and sampling periods, and the reference voltage Vref can be adjusted to be equal to or lower than the low-potential voltage ELVSS. An initialization voltage Vini and a reset voltage VAR can be provided to the sub-pixels from the power generator.

[0049] The thin-film transistor (TFT) constituting the sub-pixel can be implemented as an oxide transistor (or oxide TFT) including an oxide semiconductor layer. Considering electron mobility and process variations (or process margins), oxide TFTs are advantageous for realizing large-area display panels 110. However, embodiments of the present invention are not limited to this; the semiconductor layer of the TFT can be formed from amorphous silicon, polycrystalline silicon, etc.

[0050] Each sub-pixel may include multiple TFTs and a storage capacitor for compensating for deviations in the threshold voltage Vth that drives the TFTs.

[0051] For example, a pixel array may include three sub-pixels that output red, green, and blue light, respectively. For example, a pixel array may include four sub-pixels that output white, red, green, and blue light, respectively. For example, a pixel array may include at least three sub-pixels selected from white, red, green, and blue sub-pixels. For example, a pixel array may include: sub-pixels combining red, green, and blue; sub-pixels combining white, red, and green; sub-pixels combining blue, white, and red; and sub-pixels combining green, blue, and white, or may be composed of sub-pixels combining white, red, green, and blue.

[0052] The timing controller 120 can output image data provided from the image providing unit 11. The data driver 140 converts the image data provided from the timing controller 120 into a data voltage and applies the data voltage to the data line 14 of the display panel 110. The gate driver 130 can drive the gate line 15 of the display panel 110 under the control of the timing controller 120.

[0053] The timing controller 120 can rearrange the digital image data RGB provided from the image providing unit 11 according to the resolution of the display panel 110, and can provide the rearranged digital image data to the data driver 140. The timing controller 120 can generate a data control signal DDC for controlling the operation timing of the data driver 140 and a gate control signal GDC for controlling the operation timing of the gate driver 130 based on timing signals such as the vertical synchronization signal Vsync, the horizontal synchronization signal Hsync, the dot clock signal DCLK, and the data enable signal DE provided from the image providing unit 11.

[0054] The data driver 140 can convert digital image data RGB input from the timing controller 120 into analog data voltage based on the data control signal DDC and can provide analog data voltage to multiple data lines 14.

[0055] Gate driver 130 can generate scan signals and light emission signals (or light emission control signals) based on gate control signal GDC. Gate driver 130 may include scan driver and light emission signal driver. Scan driver can generate scan signals in a row sequential manner to drive at least one scan line connected to each pixel row, and can provide scan signals to scan lines. Light emission signal driver can generate light emission signals in a row sequential manner to drive at least one light emission signal line connected to each pixel row, and can provide light emission signals to light emission signal lines.

[0056] According to an embodiment of the present invention, the gate driver 130 may be integrated into the non-display area of ​​the display panel 110 according to the in-panel gate driver GIP method, but is not limited thereto. According to another embodiment of the present invention, the gate driver 130 may be divided into multiple parts, and the multiple parts of the gate driver 130 may be arranged on at least two sides of the display panel 110.

[0057] A light-emitting display device displays an image by supplying a predetermined current to multiple pixels based on image data. When a high current is continuously supplied to at least one pixel, degradation occurs in at least one or more sub-pixels. Furthermore, even when no image is output, an afterimage that appears to be image retention is produced.

[0058] To address the persistence of light limitation, light-emitting display devices reduce degradation caused by brightness deviations by adjusting the brightness value of each sub-pixel according to the degree of degradation of each light-emitting element. However, this may result in a decrease in perceived image quality.

[0059] Another method for addressing afterimage limitations involves altering brightness and saturation by correcting the red, green, and blue RGB data at a predetermined ratio. This method detects fixed areas in the image, obtains the RGB data of these detected fixed areas, and reduces the saturation of these fixed areas based on the RGB data, thereby resolving afterimages. However, even in this case, changes in brightness and saturation are still identified, which can degrade image quality.

[0060] Therefore, the inventors of this invention conducted various experiments to resolve the issue of afterimages without degrading image quality. Through these experiments, the present invention provides a display device capable of resolving afterimage limitations without degrading image quality. This will be described below.

[0061] Figure 2 This is a block diagram illustrating the structure of an image processor in a display device according to an embodiment of the present invention.

[0062] Reference Figure 1 and 2 The display device according to an embodiment of the present invention may include an image processor 200 and a display panel 110. The display panel 110 may include a plurality of pixels PXL.

[0063] Each pixel PXL constituting the display panel 110 may include one or more light-emitting portions located on a substrate between an anode and a cathode. The substrate may be formed of an insulating material to support the components of the display panel. The substrate may be formed of rigid glass, a substrate formed of a polymer resin, or a substrate formed of a flexible film, but is not limited thereto. For example, the flexible film may be plastic and polyimide, but embodiments of the present invention are not limited thereto.

[0064] When the display panel 110 is applied to a flexible display device, the display panel 110 can be formed from a flexible material such as plastic. Furthermore, when light-emitting elements that are easily made flexible are applied to vehicle lighting devices or vehicle display devices, various design and design freedoms for the vehicle lighting devices or vehicle display devices can be ensured according to the structure or shape of the vehicle. For example, the display panel 110 according to an embodiment of the present invention can be a display panel having a frame that is bent by a flexible substrate of the organic light-emitting display panel and a lower backplate support structure.

[0065] The display device according to embodiments of the present invention can be applied to display devices including TVs, mobile phones, tablet PCs (personal computers), monitors, laptops, vehicle display devices, etc. Optionally, the display device can be applied to wearable display devices, foldable display devices, rollable display devices, and flexible display devices. When the substrate is a flexible substrate, the display device can be applied to flexible display devices, foldable display devices, rollable display devices, flexible display devices, wearable display devices, variable display devices, and vehicle display devices, but the embodiments of the present invention are not limited thereto.

[0066] The anodes can be arranged to be spaced apart from each other for each pixel PXL. The anodes can be formed of a transparent conductive material with a high work function. For example, the transparent conductive material may include indium tin oxide (ITO), indium zinc oxide (IZO), etc., but embodiments of the present invention are not limited thereto.

[0067] When the display panel 110 according to an embodiment of the present invention is a top-emitting type, the anode may further include a reflective layer, thereby allowing light emitted from the light-emitting layer constituting the light-emitting portion to be more smoothly reflected to the anode and emitted in an upward direction. For example, the anode may have a double-layer structure, wherein a transparent conductive layer formed of a transparent conductive material and a reflective layer are stacked sequentially; or the anode may have a triple-layer structure, wherein a transparent conductive layer, a reflective layer, and a transparent conductive layer are stacked sequentially, but the embodiments of the present invention are not limited thereto. The reflective layer may be formed of silver (Ag) or an alloy including silver (Ag), such as Ag or APC (Ag / Pd / Cu), but the embodiments of the present invention are not limited thereto.

[0068] The cathode can be disposed on the anode. The cathode can provide electrons to the light-emitting layer of the light-emitting part. Since the cathode needs to provide electrons, it can be formed of a conductive material with a low work function. For example, the cathode can be formed of silver (Ag), titanium (Ti), aluminum (Al), molybdenum (Mo), magnesium (Mg), indium magnesium (Ag:Mg), and magnesium and lithium fluoride (Mg:LiF), but embodiments of the present invention are not limited thereto. Furthermore, the cathode can be composed of at least two or more layers, but embodiments of the present invention are not limited thereto.

[0069] According to an embodiment of the present invention, when the display panel 110 is a top-emitting type, the cathode can be a transparent conductive oxide such as indium tin oxide (ITO), indium zinc oxide (IZO), indium tin zinc oxide (ITZO), zinc oxide (ZnO), and tin oxide (TO), but the embodiments of the present invention are not limited thereto.

[0070] One or more light-emitting portions may be disposed between the anode and the cathode. The light-emitting portion may include an organic layer. For example, the light-emitting portion may include a light-emitting layer (EML) and at least one or more organic layers. For example, at least one or more organic layers may include a hole injection layer (HIL), a hole transport layer (HTL), a hole blocking layer (HBL), an electron blocking layer (EBL), and an electron transport layer (ETL), but embodiments of the present invention are not limited thereto. The electron injection layer (EIL) may be further formed on the electron transport layer, but embodiments of the present invention are not limited thereto. A capping layer may be further formed on the cathode, but embodiments of the present invention are not limited thereto. For example, the hole injection layer, hole transport layer, and electron blocking layer may be hole transfer layers, but embodiments of the present invention are not limited thereto. For example, the electron injection layer, electron transport layer, and hole blocking layer may be electron transfer layers, but embodiments of the present invention are not limited thereto.

[0071] A light-emitting unit may include a red light-emitting layer, a green light-emitting layer, and a blue light-emitting layer that emit red light, green light, and blue light for each pixel PXL.

[0072] Two or more light-emitting units may include a first light-emitting unit and a second light-emitting unit. The first and second light-emitting units may include a red light-emitting layer, a green light-emitting layer, and a blue light-emitting layer that emit red, green, and blue light for each sub-pixel. The two or more light-emitting layers included in the first and second light-emitting units may be light-emitting layers that emit light of the same color.

[0073] In another example, the first light-emitting layer included in the first light-emitting part can be a blue light-emitting layer, a sky-blue light-emitting layer, a dark blue light-emitting layer, a blue light-emitting layer and a red light-emitting layer; a sky-blue light-emitting layer and a red light-emitting layer; a dark blue light-emitting layer and a red light-emitting layer, but the embodiments of the present invention are not limited to this. For example, the second light-emitting layer included in the second light-emitting part can be a combination of a yellow light-emitting layer, a yellow-green light-emitting layer, a green light-emitting layer, a yellow light-emitting layer and a red light-emitting layer; a combination of a yellow-green light-emitting layer and a red light-emitting layer; a combination of a green light-emitting layer and a red light-emitting layer; a combination of a yellow light-emitting layer, a yellow-green light-emitting layer and a green light-emitting layer; a combination of a yellow light-emitting layer, a yellow-green light-emitting layer, a green light-emitting layer and a red light-emitting layer; a combination of two yellow-green light-emitting layers and one green light-emitting layer; a combination of two yellow-green light-emitting layers, one green light-emitting layer and a red light-emitting layer; or a combination of one yellow-green light-emitting layer, two green light-emitting layers and a red light-emitting layer, but the embodiments of the present invention are not limited to this. A charge generation layer can be formed between the first light-emitting part and the second light-emitting part. The charge generation layer can include an N-type charge generation layer and a P-type charge generation layer. Each of the first light-emitting part and the second light-emitting part may include at least one or more of a hole injection layer, a hole transport layer, a hole blocking layer, an electron blocking layer, an electron transport layer, and an electron injection layer, but the embodiments of the present invention are not limited thereto.

[0074] Two or more light-emitting portions may include a first light-emitting portion, a second light-emitting portion, and a third light-emitting portion. The first light-emitting layer included in the first light-emitting portion may be the same as described above. The second light-emitting layer included in the second light-emitting portion may be the same as described above. The third light-emitting layer included in the third light-emitting portion may be configured to be the same as the first light-emitting layer, but embodiments of the present invention are not limited thereto. A first charge-generating layer may be formed between the first and second light-emitting portions. The first charge-generating layer may include an N-type charge-generating layer and a P-type charge-generating layer. A second charge-generating layer may be formed between the second and third light-emitting portions. The second charge-generating layer may include an N-type charge-generating layer and a P-type charge-generating layer. Each of the first, second, and third light-emitting portions may include at least one or more of a hole injection layer, a hole transport layer, a hole blocking layer, an electron blocking layer, an electron transport layer, and an electron injection layer, but embodiments of the present invention are not limited thereto.

[0075] The encapsulation portion can be configured to cover the light-emitting element. The encapsulation portion protects the light-emitting element from external impurities, impacts, moisture (H2O), or oxygen (O2) penetration. The encapsulation portion can be formed of three or more layers, such as a first inorganic insulating layer, an organic insulating layer, and a second inorganic insulating layer. The encapsulation portion can have a sloped surface at the outer edge (or periphery) of the display area or in the non-display area.

[0076] The upper substrate can be further disposed on the encapsulation section. The upper substrate can be formed of a flexible film made of glass, metal, or polyimide-based material. The substrate and the upper substrate can be fixed to each other by the encapsulation section.

[0077] A touch portion for sensing user touch can be disposed on the package portion. The touch portion may include a first touch insulating layer, a touch electrode portion, and a second touch insulating layer. For example, the first touch insulating layer may be a lower insulating layer or a lower touch insulating layer, and the second touch insulating layer may be an upper insulating layer or an upper touch insulating layer, but is not limited thereto.

[0078] The touch electrode section may include multiple touch electrodes for sensing user touches. These multiple touch electrodes may be used as touch sensors for sensing user touches based on mutual capacitance or self-capacitance methods. The touch electrode section may include multiple first touch electrodes arranged in a first direction on the same plane and multiple second touch electrodes arranged in a second direction perpendicular to the first direction. The multiple first touch electrodes may be touch signal transmitting electrodes, touch TX electrodes, etc., and the multiple second touch electrodes may be touch signal receiving electrodes, touch RX electrodes, etc., but the terminology is not limited thereto.

[0079] The touch electrode portion according to embodiments of the present invention can be implemented as a touch panel including multiple touch electrodes. For example, when the light-emitting element has a top-emitting structure, an add-on type touch panel can be disposed on or bonded to the encapsulation portion or optical film. When the light-emitting element has a bottom-emitting structure, the add-on touch panel can be disposed on or bonded to the rear surface of the substrate.

[0080] According to another embodiment of the present invention, the touch electrode portion can be directly formed on the package portion using an in-cell method. For example, when the light-emitting element has a top-emitting structure, the integrated touch electrode portion can be directly formed on the front surface of the package portion.

[0081] First touch connection electrodes for connecting multiple first touch electrodes to each other may be formed on a first touch insulating layer. For example, the first touch connection electrodes and second touch connection electrodes may be arranged on different planes so as not to be electrically connected, and each of the multiple touch electrodes may be electrically connected to each other. The first touch connection electrode or the second touch connection electrode may be a touch electrode connection wiring, a touch bridging electrode, a touch bridging wiring, etc., but the terminology is not limited thereto.

[0082] Touch wiring can be arranged on the non-display area to apply electrical signals to the touch electrodes of the touch portion in the display area. Touch wiring can be touch connection wiring, touch routing wiring, etc., but the terminology is not limited to these.

[0083] Reference Figure 2The image processor 200 may include a ghost image detection unit 202 and a saturation adjusting part 204. The image processor 200 may be built into... Figure 1 The image providing unit 11, timing controller 120, and data driver 140 shown are all included. The afterimage detection unit 202 can detect afterimages from the input image data, such as first data of the first region (where the cumulative average of the data difference of each pixel between adjacent frames is less than a reference value during multiple frames).

[0084] The saturation adjustment unit 204 can adjust the saturation of the first data of the afterimage area detected by the afterimage detection unit 202 to convert the first data into second data. The saturation adjustment unit 204 can also output the data of the area that was not detected as an afterimage area, such as the third data of the second area (or the general area or the normal area) without conversion.

[0085] The image processor 200 can output image data, which includes second data of the afterimage area and third data of the normal area output from the saturation adjustment unit 204. The display panel 110 can display the image data output from the image processor 200.

[0086] Figure 3 The figure illustrates an image processing method for a display device according to an embodiment of the present invention. Figures 4A to 4C The diagram illustrates the afterimage detection method according to an embodiment of the present invention.

[0087] Combination Figure 2 The image processor 200 shown is described Figure 3 The image processing methods shown and Figures 4A to 4C The method for detecting afterimages is shown.

[0088] Reference Figure 2 and Figure 3 The image processor 200 receives and inputs image data (step S202).

[0089] The afterimage detection unit 202 can detect first data of the afterimage area from the input image data. In the afterimage area, afterimages can appear according to the light emission time and electrical stress of the light-emitting element in each pixel PXL of the display panel 110 (step S208).

[0090] For example, the afterimage detection unit 202 can accumulate the data difference of each pixel between adjacent frames using the input image data (step S204). The afterimage detection unit 202 can generate an afterimage area mask for detecting afterimage areas by using the accumulated average value of the data differences between frames (step S206). The afterimage detection unit 202 can detect the first data of the afterimage area from the image data using the generated afterimage area mask (step S208). For example, the afterimage detection unit 202 can mask a region from the image data and detect the data of the masked region as the first data, in which the accumulated average value of the data difference of each pixel between adjacent frames is less than a reference value.

[0091] For example, such as Figure 4A As shown, the image processor 200 can be provided with multiple frames (Fn, Fn+1, Fn+2, ..., where n is a positive integer) of input image data sequentially. The multiple frames (Fn, Fn+1, Fn+2, ...) of input image data may include: a fixed area A1 (or a first area) which has almost no data changes, such as having a still image; and a general area A2 (or a second area or a normal area) in which the data changes, such as having a moving image.

[0092] The afterimage detection unit 202 obtains the image by accumulating and averaging the data differences between the previous and current frames of multiple pixels PXL using input image data. Figure 4B The data difference average frame 310 shown may include: a first region 312, wherein the average data difference between frames is less than a reference value; and a second region 324, wherein the average data difference between frames is greater than the reference value. In the data difference average frame 310, the first region 312 may correspond to... Figure 4A The fixed area A1 of the multiple frames (Fn, Fn+1, Fn+2...) shown, and the second area 314 can correspond to the general area (normal area) A2.

[0093] The afterimage detection unit 202 can generate an afterimage region mask 320 based on the average frame 310 of the data difference, such as... Figure 4C As shown. The afterimage area mask 320 may include: a mask area 322, which corresponds to a first area 312 of the average frame 310 of the data difference; and a general area (or normal area) 324, which corresponds to a second area 314.

[0094] The afterimage detection unit 202 can detect and output the first data of the afterimage region corresponding to the mask region 322 of the afterimage region mask 320 from the input image data of the current frame Fn by using the afterimage region mask 320.

[0095] The saturation adjustment unit 204 adjusts the saturation of the first data of the afterimage area detected by the afterimage detection unit 202, and converts the first data into second data (step S210). The saturation adjustment method of the saturation adjustment unit 204 will be described later. The saturation adjustment unit 204 may output third data of a general area (or normal area) that is not detected as an afterimage area without conversion.

[0096] The image processor 200 can output image data, which includes third data of the normal area and second data of the afterimage area output from the saturation adjustment unit 204 (step S212).

[0097] The display panel 110 can display image data output from the image processor 200. The display panel 110 can display image data for which afterimage detection unit 202 and saturation adjustment unit 204 of image processor 200 have resolved afterimage.

[0098] Figure 5 An image processing method for a display device according to another embodiment of the present invention is illustrated.

[0099] Combination Figure 2 Image processor 200 shown in the description Figure 5 The image processing method shown.

[0100] Reference Figure 2 and Figure 5 The image processor 200 receives and inputs image data (step S402).

[0101] The afterimage detection unit 202 can detect first data of the afterimage region from the input image data (step S404). The afterimage detection unit 202 can detect the first data corresponding to the afterimage region (where the average value of the accumulated data differences from the input image data or the accumulated data differences are less than a reference value) by using the accumulated result of the data differences of each pixel between adjacent frames. Since the afterimage detection unit 202 is essentially equal to the reference value... Figures 3 to 4C The description of the afterimage detection unit 202 is provided, so its description can be omitted or simplified.

[0102] The saturation adjustment unit 204 adjusts the saturation of the first data of the afterimage area detected by the afterimage detection unit 202, and converts the first data into second data (step S406). For example, the saturation adjustment unit 204 may output third data of a general area (or second area or normal area) that is not detected as an afterimage area without conversion.

[0103] According to some embodiments of the present invention, the saturation adjustment unit 204 can obtain a saturation correction value for the first data in the afterimage region through color space conversion. For example, the saturation adjustment unit 204 can adjust the saturation of the first data (S = S × correction value) by applying the saturation correction value to the first data in the afterimage region. For example, the saturation adjustment unit 204 can calculate a first saturation information value by using color space conversion based on the first data in the afterimage region. The saturation adjustment unit 204 can adjust or reduce the saturation of the first saturation information value by applying the saturation correction value to the first saturation information value.

[0104] The saturation adjustment unit 204 converts the RGB color space to the HSL color space, thereby adjusting the saturation. A color space can be a three-dimensional spatial concept representing a color display system. The RGB color space specifies colors based on the brightness of red, green, and blue, corresponding to the three primary colors. The HSL color space can be a color space where hue, saturation, and brightness are formed on each axis of a three-dimensional space. Here, when L is 0, black is displayed, and when L is 1, white is displayed.

[0105] The saturation adjustment unit 204 adjusts a first saturation information value to a second saturation information value based on a saturation correction value, and converts the second saturation information value into second data by using color space inverse conversion. The saturation correction value can be a predetermined correction value. The saturation correction value can be multiple correction values ​​that are adjusted differently based on multiple ranges of the first saturation information value. For example, the correction value can be a gain value. For example, the gain value can be greater than or equal to 0.1 and less than or equal to 0.3. When the gain value is less than 1, an image with less image quality degradation can be provided, thereby reducing saturation without degrading image quality.

[0106] The image processor 200 can output image data, which includes second data of the afterimage area and third data of the normal area output from the saturation adjustment unit 204 (step S408). The display panel 110 can display the image data output from the image processor 200.

[0107] According to some embodiments of the present invention, the image processor 200 can correct image data without causing changes in cognitive image quality before and after the saturation reduction in the afterimage area, thereby enabling the display device to provide an image capable of resolving afterimages.

[0108] A display device according to some embodiments of the present invention may further include a storage unit. The storage unit may store a first saturation information value and a correction value corresponding to first data in the form of a lookup table. The storage unit may store second data corresponding to a second saturation information value in the form of a lookup table. The storage unit may store a correction value and a second saturation information value having a predetermined color difference value corresponding to the first saturation information value in the form of a lookup table. The image processor 200 converts the first data in the afterimage area into a first saturation information value using the lookup table in the storage unit, and can convert the first data into a second saturation information value by applying the correction value from the lookup table. The image processor 200 can convert the second saturation information value into second data using a lookup table. The first data and the second data can be stored in the lookup table in the storage unit. Therefore, compared to the case where the first saturation information value and the correction value are stored as a lookup table, the size of the storage unit can be reduced. The storage unit and the image processor 200 can be configured together in... Figure 1 The image providing unit 11, timing controller 120, and data driver 140 shown are among one or more of these components.

[0109] According to some embodiments of the present invention, a display device can resolve redundant images by using color space conversion and reducing saturation based on saturation correction values.

[0110] Figure 6 An image processing method for a display device according to another embodiment of the present invention is illustrated.

[0111] Combination Figure 2 Image processor 200 shown in the description Figure 6 The image processing method shown.

[0112] Reference Figure 2 and Figure 6 The image processor 200 receives and inputs image data (step S502).

[0113] The afterimage detection unit 202 can detect first data of the afterimage region from the input image data (step S504). The afterimage detection unit 202 can detect the first data corresponding to the afterimage region (where the average value of the accumulated data differences from the input image data or the accumulated data differences are less than a reference value) by using the accumulated result of the data differences of each pixel between adjacent frames. Since the afterimage detection unit 202 is essentially equal to the reference value... Figures 3 to 4C The description of the afterimage detection unit 202 is provided, so its description can be omitted or simplified.

[0114] The saturation adjustment unit 204 adjusts the saturation of the first data of the afterimage area detected by the afterimage detection unit 202, and converts the first data into second data (step S506). The saturation adjustment unit 204 may output third data of a general area (or second area or normal area) that is not detected as an afterimage area without conversion.

[0115] The saturation adjustment unit 204 adjusts the saturation of the first data in the afterimage area to meet a predetermined reference color difference range Δu'v' (step S508), and converts the first data into second data (step S506). The predetermined reference color difference range Δu'v' can be configured within a color difference range of the cognitive allowance level (where the viewer has difficulty perceiving the color difference between the first data and the second data). For example, the reference color difference range Δu'v' can be greater than or equal to 0.004, and can be less than or equal to 0.02.

[0116] According to some embodiments of the present invention, the saturation adjustment unit 204 can obtain the saturation correction value of the first data in the afterimage region through color space conversion and color difference Δu'v'. For example, the saturation adjustment unit 204 can calculate the first saturation information value by performing color space conversion on the first data in the afterimage region. The saturation adjustment unit 204 calculates the saturation correction value ΔS of the first saturation information value that satisfies the reference color difference range 0.004≤Δu'v'≤0.02, and adjusts or reduces the saturation of the first saturation information value by applying the calculated saturation correction value ΔS. The saturation adjustment unit 204 can convert the RGB color space to the HSL color space and can be used with... Figure 5 The content shown is the same. The saturation correction value ΔS can be adjusted to meet the reference color difference range of 0.004≤Δu'v'≤0.02.

[0117] According to some embodiments of the present invention, the saturation adjustment unit 204 can calculate a first saturation information value based on first data of the residual image area, adjust the first saturation information value to a second saturation information value according to a saturation correction value, and convert the second saturation information value into second data. The saturation adjustment unit 204 can calculate the color difference Δu'v' between the first data and the second data. The saturation adjustment unit 204 repeats the step of adjusting the second saturation information value by adjusting the saturation correction value until the calculated color difference Δu'v' satisfies the reference color difference range 0.004≤Δu'v'≤0.02 (steps S506 and S508).

[0118] A display device according to some embodiments of the present invention may further include a storage unit. The storage unit may store a correction value corresponding to first data and a first saturation information value in the form of a lookup table. The storage unit may store a second saturation information value satisfying a predetermined reference color difference range in response to the correction value and the first saturation information value in the form of a lookup table. The storage unit may store second data corresponding to the second saturation information value in the form of a lookup table. The image processor 200 can convert the first data of the afterimage area into a first saturation information value by using the lookup table of the storage unit, and can convert the first data of the afterimage area into a second saturation information value satisfying a reference color difference range by applying the correction value of the lookup table. The image processor 200 can convert the second saturation information value into second data by using a lookup table. The first data and the second data can be stored in the lookup table of the storage unit. Therefore, compared to the case where the first saturation information value and the correction value are stored as a lookup table, the size of the storage unit can be reduced. The storage unit and the image processor 200 can be configured together in... Figure 1 The image providing unit 11, timing controller 120, and data driver 140 shown are among one or more of these components.

[0119] According to some embodiments of the present invention, the saturation adjustment unit 204 can adjust the saturation to meet a reference color difference range in order to convert the first data of the afterimage area into second data. The image processor 200 can output image data including the third data of the normal area output from the saturation adjustment unit 204 and the second data of the afterimage area (step S510). The display panel 110 can display the image data output from the image processor 200.

[0120] According to some embodiments of the present invention, the image processor 200 can correct image data without causing a change in perceived image quality before and after the reduction of saturation in the afterimage area; for example, there is no perceptible change in saturation, thereby the display device can provide an image that resolves afterimages. According to some embodiments of the present invention, the display device can resolve afterimages by using color space conversion and a reference color difference range to reduce saturation within a perceptible level where it is difficult for a viewer to discern data in the afterimage area.

[0121] Figure 7 An image processing method for a display device according to another embodiment of the present invention is illustrated. Figure 8 This is a block diagram illustrating the structure of an image processor in a display device according to another embodiment of the present invention.

[0122] Reference Figure 7 and Figure 8According to some embodiments of the present invention, the image processor 700 of the display device may include an afterimage detection unit 704, a saturation adjustment unit 710, and a color difference comparison unit 716. The image processor 700 may further include a first conversion unit 706, a first calculation unit 708, a second conversion unit 712, and a second calculation unit 714. The image processor 700 may further include an image input unit 702 and an image output unit 718.

[0123] The image input unit 702 of the image processor 700 receives and inputs image data (step S602).

[0124] The afterimage detection unit 704 can detect first data of the afterimage region from the input image data (step S603). The afterimage detection unit 704 can detect the first data corresponding to the afterimage region (where the average value of the accumulated data differences from the input image data or the accumulated data differences are less than a reference value) by using the accumulated result of the data differences of each pixel between adjacent frames. The afterimage detection unit 704 is essentially equal to the reference value. Figures 3 to 4C The afterimage detection unit 202 is described.

[0125] According to some embodiments of the present invention, the first conversion unit 706 can convert the first data of the superimposed image area into first color space data through a first color space conversion (step S604). The first conversion unit 706 can convert the first data of the superimposed image area from the RGB color space to the HSL color space. For example, the first data can be RGB data, and the first data can be converted into the HSL color space to calculate the first saturation information value.

[0126] In the RGB color space, all points where the RGB value is 0 (minimum) are black, and the vector of points where the RGB value is 1 (maximum) is white. Then, red and green vectors become yellow, green and blue vectors become cyan, and blue and red vectors become magenta. Furthermore, neutral colors such as gray can lie on the line connecting black and white. The RGB color space is a concept that creates all colors by combining the three primary colors, but it may be insufficient depending on the individual's perception and expression of color.

[0127] Therefore, the HSL color space is configured based on the properties of color recognition (or perception) in the human eye and brain. Here, H, the chromaticity value of the HSL color space, refers to the relative angle of arrangement when the longest wavelength is 0° in the hue circle, which is arranged in a ring shape in the visible light spectrum. Therefore, H values ​​range from 0° to 360°, with 360° and 0° representing the same color. The saturation value S represents the degree to which a specific color is at its most effective or pure state of 100%. A saturation value of 0% represents an achromatic color with the same brightness. Brightness can be a component representing the degree of lightness. The brightest color, such as white, is set at position 1.0 (100%); the darkest color, such as black, is located at position 0.0 (0%), and the brightness of all other colors exists between white and black.

[0128] According to some embodiments of the present invention, the first calculation unit 708 can receive first data of the afterimage region from the first conversion unit 706, and can calculate a first uniform chromaticity diagram u'v' for the first data of the afterimage region (step S606). The first uniform chromaticity diagram u'v' can represent color differences. When the RGB color space is sRGB, RGB can be converted to XYZ. This will be represented by the following Equation 1.

[0129] Equation 1

[0130]

[0131]

[0132] Equation 2 below represents the equation for converting XYZ into a uniform chromaticity map u'v'.

[0133] Equation 2

[0134]

[0135]

[0136] According to some embodiments of the present invention, the saturation adjustment unit 710 can apply a saturation correction value to a first saturation information value in the residual image area, and can adjust the first saturation information value to a second saturation information value (S = S – correction value (ΔS)) (step S608). The saturation adjustment unit 710 adjusts the first saturation information value of the first color space data to the second saturation information value based on the saturation correction value, thereby correcting the first saturation information value to second color space data including the second saturation information value.

[0137] According to some embodiments of the present invention, the second conversion unit 712 can convert second color space data including the second saturation information value of the redundant image area into second data through second color space conversion, such as color space inverse conversion (step S610). Color space inverse conversion is used to convert the HSL color space to the RGB color space.

[0138] The second calculation unit 714 can calculate the second uniform chromaticity diagram u'v' based on the second data. The second uniform chromaticity diagram u'v' can be calculated based on the second data using the above equations 1 and 2.

[0139] According to some embodiments of the present invention, the color difference comparison unit 716 can calculate the color difference value Δu'v' by comparing a first uniform chromaticity diagram and a second uniform chromaticity diagram (step S614). The color difference value Δu'v' can be calculated using the following equation 3.

[0140] Equation 3

[0141]

[0142] In Equation 3, u'1 and v'1 can be the first uniform chromaticity diagram, and u'2 and v'2 can be the second uniform chromaticity diagram.

[0143] The saturation adjustment unit 710 can adjust the second saturation information value so that the color difference value Δu'v' between the first uniform chromaticity diagram and the second uniform chromaticity diagram satisfies the reference color difference range 0.004 ≤ Δu'v' ≤ 0.02 in the color difference comparison unit 716. The saturation adjustment unit 710 can adjust the second saturation information value by adjusting the saturation correction value ΔS, so that the color difference value Δu'v' between the first uniform chromaticity diagram and the second uniform chromaticity diagram satisfies the reference color difference range 0.004 ≤ Δu'v' ≤ 0.02. For example, the predetermined reference color difference range Δu'v' in the color difference comparison unit 716 can be greater than or equal to 0.004 and less than or equal to 0.02. For example, the saturation adjustment unit 710 can adjust or determine the saturation correction value based on the predetermined reference color difference range.

[0144] For example, if the color difference value Δu'v' between the first uniform chromaticity diagram and the second uniform chromaticity diagram does not satisfy the reference color difference range 0.004≤Δu'v'≤0.02 in the color difference comparison unit 716 (No in step S616), then the second saturation information value is output to the saturation adjustment unit 710. Then, the steps of adjusting the second saturation information value of the saturation adjustment unit 710 (step S608), the second color space conversion step of the second conversion unit 712 (step S610), the second uniform chromaticity diagram calculation step of the second calculation unit 714 (step S612), the color difference calculation step of the color difference comparison unit 716 (step S614), and the color difference comparison step (step S616) can be repeatedly executed.

[0145] According to another embodiment of the present invention, if the color difference value Δu'v' between the first uniform chromaticity diagram and the second uniform chromaticity diagram does not satisfy the reference color difference range 0.004≤Δu'v'≤0.02 in the color difference comparison unit 716 (No in step S616), the process returns to the first conversion unit 706 and the first color space conversion step (step S604) can be executed. Then, the steps of adjusting the second saturation information value of the saturation adjustment unit 710 (step S608), the second color space conversion step of the second conversion unit 712 (step S610), the second uniform chromaticity diagram calculation step of the second calculation unit 714 (step S612), the color difference calculation step of the color difference comparison unit 716 (step S614), and the color difference comparison step (step S616) can be repeatedly executed.

[0146] If the color difference value Δu'v' between the first uniform chromaticity map and the second uniform chromaticity map satisfies the reference color difference range 0.004≤Δu'v'≤0.02 in the color difference comparison unit 716 (Yes in step S616), then the color difference comparison unit 716 can output the second data of the residual image area.

[0147] The image output unit 718 can output image data, which includes third data of the normal area and second data of the afterimage area output from the color difference comparison unit 716 (step S618). The display panel 110 can display the image data output from the image processor 200.

[0148] A display device according to some embodiments of the present invention may further include a storage unit. The storage unit may store saturation correction values ​​and first saturation information values ​​corresponding to first data in a lookup table format. The storage unit may store the first saturation information values, second saturation information values, and a first uniform chromaticity map and a second uniform chromaticity map in a lookup table format. The storage unit may store second data corresponding to the second saturation information values ​​in a lookup table format. The first data and the second data may be stored in the lookup table of the storage unit. Therefore, compared to the case where the saturation information values ​​and correction values ​​are stored as a lookup table, the size of the storage unit can be reduced. The storage unit and the image processor 700 may be configured together in... Figure 1 The image providing unit 11, timing controller 120, and data driver 140 shown are among one or more of these components.

[0149] According to some embodiments of the present invention, the image processor 700 can correct image data without causing a change in perceived image quality before and after the reduction of saturation in the afterimage area; for example, there is no perceptible change in saturation, thereby the display device can provide an image that resolves afterimages. According to some embodiments of the present invention, the display device can resolve afterimages by using color space conversion and a reference color difference range to reduce saturation within a perceptible level where it is difficult for a viewer to discern data in the afterimage area.

[0150] Table 1 below shows the results based on... Figure 5 The embodiment of the present invention shown exhibits reduced saturation and an improvement rate in the number of afterimage occurrences compared to the original image. The improvement rate of the embodiment of the present invention compared to the original image is measured by comparing the number of afterimage occurrences in the first to third test images with the number of afterimage occurrences in the original image.

[0151] Table 1

[0152]

[0153] Referring to the improvement rate of the number of afterimage occurrences in Table 1, compared with the original image, red was measured to have an improvement rate of 374%, green to have an improvement rate of 375%, blue to have an improvement rate of 79%, and white to have an improvement rate of 1%.

[0154] Table 2 below shows the results based on Figure 6 The embodiment of the present invention shown exhibits reduced saturation and an improvement rate in the number of afterimage occurrences compared to the original image. The improvement rate of the embodiment of the present invention compared to the original image is measured by comparing the number of afterimage occurrences in the first to third test images with the number of afterimage occurrences in the original image.

[0155] Table 2

[0156]

[0157]

[0158] Referring to the improvement rate of afterimage occurrences in Table 2, compared to the original image, red was measured to have an afterimage improvement rate of 66%, green had an improvement rate of 61%, blue had an improvement rate of 18%, and white had an improvement rate of 1%.

[0159] Referring to Tables 1 and 2, compared to those using the perceived saturation adjustment method... Figure 6 The implementation method employs a simple saturation adjustment method using a reference color difference range. Figure 5 The implementation method can further improve the improvement rate of afterimage occurrence. The simple saturation adjustment method has a significant improvement effect in solving afterimages, but it has limitations in perceiving the difference caused by the reduction in saturation. The perceived saturation adjustment method has a smaller improvement effect in solving afterimages compared with the simple saturation adjustment method, but it has the advantage in that the user cannot perceive the difference.

[0160] Table 3 below compares the data before saturation reduction with the data based on... Figure 6The invention describes a comparison of data after saturation reduction in some embodiments. For example, in Table 3 below, the input data can be first RGB data, and the data after saturation reduction can be second RGB data.

[0161] Table 3

[0162]

[0163] Referring to Table 3 above, the data for pixels displaying blue, green, red, yellow, magenta, and cyan are shown. For pixels displaying blue, the input R, G, and B values ​​are 46, 60, and 153; after reducing saturation, the R, G, and B values ​​are measured to be 50, 63, and 149, respectively. Therefore, it can be concluded that the change in blue is relatively small before and after reducing saturation. For pixels displaying green, the input R, G, and B values ​​are 71, 150, and 69; after reducing saturation, the R, G, and B values ​​are measured to be 81, 139, and 80, respectively. Therefore, it can be concluded that the change in green is relatively small before and after reducing saturation. For pixels displaying red, the input R, G, and B values ​​are 177, 44, and 56; after reducing saturation, the R, G, and B values ​​are measured to be 171, 50, and 61, respectively. Therefore, it can be concluded that the change in red is relatively small before and after reducing saturation. In the pixels displaying yellow, the input R, G, and B values ​​are 238, 200, and 27; after reducing saturation, the R, G, and B values ​​are measured to be 191, 170, and 74, respectively. In the pixels displaying magenta, the input R, G, and B values ​​are 187, 82, and 148; after reducing saturation, the R, G, and B values ​​are measured to be 179, 90, and 146, respectively. Therefore, it can be concluded that the change in magenta is relatively small before and after reducing saturation. In the pixels displaying cyan, the input R, G, and B values ​​are 0, 135, and 166; after reducing saturation, the R, G, and B values ​​are measured to be 41, 110, and 125, respectively.

[0164] According to some embodiments of the present invention, in the case of a display device that applies saturation reduction by using color space conversion, the color difference value before and after saturation reduction satisfies a reference color difference value of 0.02 or a reference color difference range of 0.004 ≤ Δu'v' ≤ 0.02, thereby enabling a display device that can resolve afterimages without perceiving saturation changes before and after saturation reduction, and improving the lifespan of the display device.

[0165] according to Figures 2 to 8The image processors 200 and 700 described in this embodiment of the invention may be configured in the image providing unit 11. For example, the image providing unit 11 may include the image processors 200 and 700 and may provide image data including second data obtained by correcting first data of the afterimage area and third data of other areas or another area (or general area or normal area) that are different from the afterimage area.

[0166] Image processors 200 and 700 according to another embodiment of the present invention may be configured in timing controller 120. For example, timing controller 120 may include image processors 200 and 700 and may provide image data including second data obtained by correcting first data of the afterimage area and third data of other areas or another area (or general area or normal area) different from the afterimage area.

[0167] Image processors 200 and 700 according to another embodiment of the present invention may be configured in a data driver 140. For example, the data driver 140 may include image processors 200 and 700 and may convert image data into data voltage and output the data voltage to the data lines of the display panel 110, wherein the image data includes second data obtained by correcting first data of the afterimage area and third data of other areas or another area (or general area or normal area) that are different from the afterimage area.

[0168] A display device according to some embodiments of the present invention may include a display panel 110, a controller, and a circuit section.

[0169] The display panel 110 may include multiple pixels. The controller may be a timing controller 120, but embodiments of the present invention are not limited thereto.

[0170] According to some embodiments of the present invention, a controller receives image data, detects first data of the afterimage region from the image data by using the data difference of each pixel accumulated between adjacent frames, determines a saturation correction value based on the first data of the afterimage region, corrects the first data of the afterimage region to second data based on the saturation correction value, and provides output data including the second data. The circuitry can provide data signals to multiple pixels based on the output data provided from the controller.

[0171] Figures 9A to 9F The diagram illustrates the saturation changes before and after saturation reduction according to an embodiment of the present invention.

[0172] Specifically, Figures 9A to 9F The diagram illustrates the basis Figure 7 and Figure 8 The saturation variation described in the color difference value. Figures 9A to 9FIn the image, the first pixels 811, 821, 831, 841, 851, and 861 on the left side show the values ​​obtained by measuring the first RGB data before saturation reduction, while the second pixels 812, 822, 832, 842, 852, and 862 on the right side show the values ​​obtained by measuring the second RGB data after saturation reduction.

[0173] Figure 9A , 9B The diagram with 9C illustrates the saturation change when the color difference value Δu'v' is 0.004 before and after saturation reduction. (Refer to...) Figure 9A Before the saturation was reduced, the first pixel 811, displaying orange, had R, G, and B values ​​of 217, 122, and 37. After the saturation was reduced, the second pixel 812 had R, G, and B values ​​of 214, 122, and 40. (See reference...) Figure 9B Before the saturation was reduced, the first pixel 821, which displayed yellow, had R, G, and B values ​​of 238, 200, and 27, respectively. After the saturation was reduced, the second pixel 822 had R, G, and B values ​​of 223, 191, and 42, respectively. (See reference...) Figure 9C Before the saturation reduction, the R, G, and B values ​​of the first pixel 831, displaying a violet color, are 187, 82, and 148, respectively. After the saturation reduction, the R, G, and B values ​​of the second pixel 832 are 186, 83, and 148, respectively. Therefore, assuming that the color difference value Δu'v' before and after the saturation reduction is 0.004 according to some embodiments of the invention, the viewer will not perceive a color difference between the original image and the image after the saturation reduction, thus there is almost no color change before and after the saturation reduction.

[0174] Figure 9D , 9E The figure and 9F illustrate the saturation change when the color difference value Δu'v' is 0.02 before and after the saturation reduction. Figure 9D , 9E Figure 9F illustrates the saturation changes when the first pixels 841, 851, and 861 before saturation reduction are separated from the second pixels 842, 852, and 862 after saturation reduction by pixels 843, 853, and 863 with a spacing of D. (See Figure 9F for reference.) Figure 9D Before the saturation was reduced, the first pixel 841, displaying orange, had R, G, and B values ​​of 217, 122, and 37. After the saturation was reduced, the second pixel 842 had R, G, and B values ​​of 200, 123, and 53. (See reference...) Figure 9E Before the saturation was reduced, the first pixel 851, displaying yellow, had R, G, and B values ​​of 238, 200, and 27, respectively. After the saturation was reduced, the second pixel 852 had R, G, and B values ​​of 191, 170, and 74, respectively. (See reference...) Figure 9F Before the saturation reduction, the R, G, and B values ​​of the first pixel 861, which displays a bluish-purple color, are 187, 82, and 148, respectively. After the saturation reduction, the R, G, and B values ​​of the second pixel 862 are 179, 90, and 146, respectively. Therefore, assuming that the color difference value Δu'v' before and after the saturation reduction is 0.02 according to some embodiments of the present invention, the color difference can be identified as an acceptable level during separation, with almost no color change before and after the saturation reduction. Furthermore, when the color difference value Δu'v' before and after the saturation reduction exceeds 0.02, the image quality can degrade. Therefore, the display device according to some embodiments of the present invention is configured to have a color difference value of less than or equal to 0.02, thereby resolving afterimages without degrading image quality.

[0175] Figures 10A to 10F The diagram illustrates the saturation changes before and after saturation reduction according to an embodiment of the present invention.

[0176] Specifically, Figures 10A to 10F A diagram illustrating reference-based Figure 5 , Figure 7 and Figure 8 The saturation change described by the saturation reduction method. Figures 10A to 10F In the image, the first pixels 911, 921, 931, 941, 951, and 961 on the left side show the values ​​obtained by measuring the first RGB data before saturation reduction, while the second pixels 912, 922, 932, 942, 952, and 962 on the right side show the values ​​obtained by measuring the second RGB data after saturation reduction.

[0177] Figure 10A , 10B The 10C diagram illustrates the reference-based approach. Figure 5 The description of the saturation reduction method shows the saturation change. For example, it shows when... Figure 5 The saturation change when a saturation correction value of 0.3 is applied, as described in [reference]. Figure 10A Before the saturation was reduced, the first pixel 911, displaying orange, had R, G, and B values ​​of 217, 122, and 37, respectively. After the saturation was reduced, the second pixel 912 had R, G, and B values ​​of 190, 123, and 64. (See reference...) Figure 10B Before the saturation was reduced, the first pixel 921, which displayed yellow, had R, G, and B values ​​of 238, 200, and 27, respectively. After the saturation was reduced, the second pixel 922 had R, G, and B values ​​of 202, 155, and 70, respectively. (See reference...) Figure 10CBefore the saturation was reduced, the R, G, and B values ​​of the first pixel 931, which displayed a blue-purple color, were 187, 82, and 148, respectively. After the saturation was reduced, the R, G, and B values ​​of the second pixel 932 were 171, 98, and 144, respectively.

[0178] Figure 10D , 10E The 10F diagram illustrates the reference-based approach. Figure 7 and Figure 8 The saturation change described by the saturation reduction method. For example, Figure 7 and Figure 8 The graph illustrates the saturation change when the color difference value Δu'v' is 0.004 before and after the saturation decrease. (Refer to...) Figure 10D Before the saturation was reduced, the first pixel 941, displaying orange, had R, G, and B values ​​of 217, 122, and 37. After the saturation was reduced, the second pixel 942 had R, G, and B values ​​of 214, 122, and 40. (See reference...) Figure 10E Before the saturation was reduced, the first pixel 951, displaying yellow, had R, G, and B values ​​of 238, 200, and 27, respectively. After the saturation was reduced, the second pixel 952 had R, G, and B values ​​of 223, 191, and 42, respectively. (See reference...) Figure 10F Before the saturation was reduced, the R, G, and B values ​​of the first pixel 961, which displayed a blue-purple color, were 187, 82, and 148, respectively. After the saturation was reduced, the R, G, and B values ​​of the second pixel 962 were 186, 83, and 148, respectively.

[0179] Reference Figures 10A to 10F We can conclude that: compared to Figure 5 The described saturation reduction method, Figure 7 and Figure 8 The described saturation reduction method exhibits relatively small color changes before and after saturation reduction. According to some embodiments of the invention, since saturation is reduced using color space conversion and a reference color difference range, it is known that color changes are small before and after saturation reduction.

[0180] Figure 11 The diagram illustrates the brightness of a sub-pixel according to an embodiment of the present invention.

[0181] exist Figure 11 In the diagram, the horizontal axis represents pixels, and the vertical axis represents brightness (unit: nits). The thin solid line represents the brightness of the original image, and the thick solid line represents the average brightness after saturation reduction. Saturation reduction is applied to the reference... Figure 7 and Figure 8 The method for reducing saturation is described.

[0182] Reference Figure 11In the red sub-pixel, the original image brightness is 4.9 nits, and the brightness after saturation reduction is 4.8 nits. Therefore, the brightness difference of the red sub-pixel before and after saturation reduction is -0.1 nits. In the green sub-pixel, the original image brightness is 4.4 nits, and the brightness after saturation reduction is measured as 4.6 nits. Therefore, the brightness difference of the green sub-pixel before and after saturation reduction is +0.2 nits. In the blue sub-pixel, the original image brightness is 0.1 nits, and the brightness after saturation reduction is 0.1 nits. Therefore, the brightness difference of the blue sub-pixel before and after saturation reduction is 0. In the white sub-pixel, the original image brightness is 15.4 nits, and the brightness after saturation reduction is 15.8 nits. Therefore, the brightness difference of the white sub-pixel before and after saturation reduction is +0.4 nits. Therefore, according to some embodiments of the present invention, even with saturation reduction, there is almost no change in overall brightness. According to some embodiments of the present invention, even when saturation is reduced, afterimages can be resolved without changes in brightness. For example, when brightness is adjusted to resolve afterimages, saturation may degrade, and when saturation is adjusted to resolve afterimages, image quality degradation due to brightness degradation may occur. According to some embodiments of the present invention, even when saturation is reduced to resolve afterimages, afterimages can be resolved without changes in brightness, thereby resolving afterimages without degrading image quality and improving the lifespan of the display device.

[0183] Figure 12 The diagram illustrates the color difference between data before and after saturation reduction according to an embodiment of the present invention.

[0184] Specifically, Figure 12 The color difference shown in Table 4 below is illustrated.

[0185] Table 4 below compares some embodiments of the present invention in Figure 6 and Figure 7 Data before and after saturation reduction. A second uniform chromaticity map and color difference are shown.

[0186] Table 4

[0187]

[0188] Referring to Table 4 above, data for pixels displaying blue, green, red, yellow, magenta, and cyan are provided. For pixels displaying blue, the u'v' values ​​of the uniform chromaticity map of the input data are 0.19 and 0.21, and the u'v' values ​​of the uniform chromaticity map after saturation reduction are 0.19 and 0.23. For pixels displaying blue, the color difference Δu'v', which is the difference between the uniform chromaticity map values ​​of the input data and those after saturation reduction, is measured to be 0.02. Therefore, it can be concluded that the u'v' values ​​of the uniform chromaticity map change only slightly before and after saturation reduction, with a color difference Δu'v' of 0.02. For pixels displaying green, the u'v' values ​​of the uniform chromaticity map of the input data are 0.14 and 0.54, and the u'v' values ​​of the uniform chromaticity map after saturation reduction are 0.15 and 0.53. In the pixels displaying green, the color difference value Δu'v' was measured to be 0.02. Therefore, it can be concluded that in the pixels displaying green, the u'v' value of the uniform chromaticity map before and after the saturation reduction only changes slightly, and the color difference value Δu'v' is 0.02.

[0189] In the pixels displaying red, the u'v' values ​​of the uniform chromaticity map of the input data are 0.42 and 0.50. After the saturation is reduced, the u'v' values ​​of the uniform chromaticity map are also 0.40 and 0.50, and the color difference Δu'v' is 0.02. Therefore, it can be concluded that in the pixels displaying red, the u'v' values ​​of the uniform chromaticity map before and after the saturation reduction only change slightly, and the color difference Δu'v' is 0.02. In the pixels displaying yellow, the u'v' values ​​of the uniform chromaticity map of the input data are 0.23 and 0.56. After the saturation is reduced, the u'v' values ​​of the uniform chromaticity map are 0.22 and 0.54, and the color difference Δu'v' is 0.02. Therefore, it can be concluded that in the pixels displaying yellow, the u'v' values ​​of the uniform chromaticity map before and after the saturation reduction only change slightly, and the color difference Δu'v' is 0.02.

[0190] In pixels displaying magenta, the u'v' values ​​of the uniform chromaticity map of the input data are 0.31 and 0.39. After the saturation is reduced, the u'v' values ​​of the uniform chromaticity map are 0.29 and 0.40, and the color difference Δu'v' is measured to be 0.02. Therefore, it can be concluded that in pixels displaying magenta, the u'v' values ​​of the uniform chromaticity map before and after the saturation reduction only change slightly, and the color difference Δu'v' is 0.02. In pixels displaying cyan, the u'v' values ​​of the uniform chromaticity map of the input data are 0.15 and 0.38. After the saturation is reduced, the u'v' values ​​of the uniform chromaticity map are 0.16 and 0.41, and the color difference Δu'v' is 0.02. Therefore, it can be concluded that in pixels displaying cyan, the u'v' values ​​of the uniform chromaticity map before and after the saturation reduction only change slightly, and the color difference Δu'v' is 0.02.

[0191] According to some embodiments of the present invention, in the case of a display device that applies saturation reduction by using color space conversion, the color difference value Δu'v' before and after saturation reduction satisfies 0.02 or not greater than 0.02, thereby enabling a display device that can resolve afterimages without saturation changes before and after saturation reduction. Furthermore, a display device that minimizes image quality degradation by resolving afterimages can be provided, thereby improving the lifespan of the display device.

[0192] Display devices according to some embodiments of the present invention can resolve the persistence limitation without degrading image quality. Display devices according to some embodiments of the present invention can improve lifespan by resolving the persistence limitation without degrading image quality. Display devices according to some embodiments of the present invention can resolve persistence by adjusting saturation without changing brightness.

[0193] The display devices according to some embodiments of the present invention can be applied to mobile devices, video phones, smartwatches, watch phones, wearable devices, foldable devices, rollable devices, bendable devices, flexible devices, bending devices, sliding devices, variable devices, electronic notebooks, e-books, portable multimedia players (PMPs), personal digital assistants (PDAs), MP3 players, mobile medical devices, desktop PCs, laptop PCs, netbooks, workstations, navigation devices, vehicle navigation devices, vehicle display devices, vehicle devices, cinema devices, cinema display devices, televisions, wallpaper devices, signage devices, gaming devices, laptops, monitors, cameras, portable cameras, and home appliances. Furthermore, the display devices of the present invention can be applied to organic light-emitting devices or inorganic light-emitting devices.

[0194] The display device according to some embodiments of the present invention can be described as follows.

[0195] A display device according to some embodiments of the present invention may include: a ghost image detection unit configured to detect first data of a ghost image area from image data; a saturation adjustment unit configured to adjust the saturation of the first data of the ghost image area detected by the ghost image detection unit and convert the first data into second data; and a display panel including a plurality of pixels configured to display data including the second data output from the saturation adjustment unit.

[0196] According to some embodiments of the present invention, the afterimage detection unit can detect first data of the afterimage region by accumulating the data difference between adjacent frames of each of the plurality of pixels.

[0197] According to some embodiments of the present invention, the saturation adjustment unit may be configured to calculate a first saturation information value based on first data of the residual image area, adjust the first saturation information value to a second saturation information value based on a correction value, and convert data including the second saturation information value into the second data.

[0198] According to some embodiments of the present invention, the display device may further include a storage unit configured to store a first saturation information value corresponding to the first data and the correction value in the form of a lookup table.

[0199] According to some embodiments of the present invention, the display device may further include a storage unit configured to store the first data and the second data in the form of a lookup table.

[0200] According to some embodiments of the present invention, the saturation adjustment unit may be configured to calculate the first saturation information value based on the first data of the residual image area, adjust the first saturation information value to the second saturation information value based on the correction value, convert data including the second saturation information value into the second data, and calculate the color difference value between the first data and the second data.

[0201] According to some embodiments of the present invention, the display device may further include a storage unit configured to store the correction value and a second saturation information value having a predetermined color difference value corresponding to the first saturation information value in the form of a lookup table.

[0202] According to some embodiments of the present invention, the display device may further include a storage unit configured to store the first data and the second data in the form of a lookup table.

[0203] According to some embodiments of the present invention, the saturation adjustment unit may be configured to convert the first data into second data that includes a predetermined reference color difference range and output the second data.

[0204] According to some embodiments of the present invention, the predetermined reference color difference range may be greater than or equal to about 0.004 and less than or equal to about 0.02, or from about 0.004 to about 0.02.

[0205] According to some embodiments of the present invention, the saturation adjustment unit may be configured to calculate a first uniform chromaticity map and a first saturation information value by converting the first data of the residual image area using color space conversion, adjust the first saturation information value to a second saturation information value according to the correction value, calculate a second uniform chromaticity map and the second data by converting the second saturation information value using inverse color space conversion, and calculate a color difference value by comparing the first uniform chromaticity map with the second uniform chromaticity map.

[0206] According to some embodiments of the present invention, the display device may further include a storage unit configured to store the first uniform chromaticity map and the second uniform chromaticity map in the form of a lookup table.

[0207] According to some embodiments of the present invention, the saturation adjustment unit may be configured to adjust the second saturation information value so that the calculated color difference value satisfies the predetermined reference color difference range.

[0208] According to some embodiments of the present invention, the saturation adjustment unit may be configured to convert the first data into the second data based on the predetermined reference color difference range.

[0209] According to some embodiments of the present invention, the predetermined reference color difference range may be from about 0.004 to about 0.02.

[0210] According to some embodiments of the present invention, the display device may further include: an image providing unit, the image providing unit including the afterimage detection unit and the saturation adjustment unit, and configured to provide second data of the afterimage area and third data of other areas (or another area) different from the afterimage area; a timing controller, the timing controller being configured to output data received from the image providing unit; a data driver, the data driver being configured to convert the data provided by the timing controller into a data voltage and apply the data voltage to the data lines of the display panel; and a gate driver, the gate driver being configured to drive the gate lines of the display panel according to the control of the timing controller.

[0211] According to some embodiments of the present invention, the display device may further include: an image providing unit configured to provide the image data; a timing controller including the afterimage detection unit and the saturation adjustment unit and configured to provide second data for the afterimage area and third data for other areas (or another area) different from the afterimage area; a data driver configured to convert the data provided by the timing controller into a data voltage and apply the data voltage to the data lines of the display panel; and a gate driver configured to drive the gate lines of the display panel according to the control of the timing controller.

[0212] According to some embodiments of the present invention, the display device may further include: an image providing unit configured to provide the image data; a timing controller configured to output the image data received from the image providing unit; a data driver including the afterimage detection unit and the saturation adjustment unit, and configured to convert second data of the afterimage area and third data of other areas (or another area) different from the afterimage area into a data voltage and output the data voltage to the data lines of the display panel; and a gate driver configured to drive the gate lines of the display panel according to the control of the timing controller.

[0213] According to some embodiments of the present invention, the correction value may be greater than or equal to 0.1 and less than or equal to 0.3, or a gain value from about 0.1 to about 0.3.

[0214] According to some embodiments of the present invention, the afterimage detection unit can detect the first data of the afterimage region by accumulating and averaging the data differences between the plurality of pixels in the previous frame and the current frame using the image data to obtain the average frame of the data differences.

[0215] According to some embodiments of the present invention, the afterimage detection unit may generate an afterimage region mask based on the average frame of the data difference, and use the afterimage region mask to detect and output the first data of the afterimage region from the image data of the current frame.

[0216] A display device according to some embodiments of the present invention may include: a display panel including a plurality of pixels; a controller configured to receive image data, detect first data of a residual image area from the image data by using data differences of each pixel accumulated between adjacent frames, adjust a saturation correction value based on the first data of the residual image area, correct the first data of the residual image area to second data based on the saturation correction value, and provide output data including the second data; and a circuit unit configured to provide data signals to the plurality of pixels based on the output data provided from the controller.

[0217] According to some embodiments of the present invention, the controller may include: an afterimage detection unit configured to detect first data of the afterimage region from the image data; and a saturation adjustment unit configured to determine a saturation correction value of the first data of the afterimage region and correct the first data to the second data.

[0218] According to some embodiments of the present invention, the afterimage detection unit can mask a region from the image data and detect the data of the masked region as the first data, in which the cumulative average value of the data difference of each pixel between adjacent frames is less than a reference value.

[0219] According to some embodiments of the present invention, the saturation correction value may be a predetermined gain value.

[0220] According to some embodiments of the present invention, the saturation adjustment unit may be configured to correct the first data to the second data based on a predetermined reference color difference range.

[0221] According to some embodiments of the present invention, the predetermined reference color difference range may be greater than or equal to 0.004 and less than or equal to 0.02, or from about 0.004 to about 0.02.

[0222] According to some embodiments of the present invention, the controller may include: an afterimage detection unit configured to detect first data of the afterimage region from the image data; a first conversion unit configured to convert the first data into first color space data by color space conversion; a first calculation unit configured to calculate a first uniform chromaticity map based on the first data from the first conversion unit; a saturation adjustment unit configured to adjust the saturation of the first color space data based on the saturation correction value and correct the first color space data to second color space data; a second conversion unit configured to convert the second color space data into the second data by inverse color space conversion; a second calculation unit configured to calculate a second uniform chromaticity map based on the second data; and a color difference comparison unit configured to calculate a color difference value between the first uniform chromaticity map of the first calculation unit and the second uniform chromaticity map of the second calculation unit, and compare the calculated color difference value with a predetermined reference color difference range.

[0223] According to some embodiments of the present invention, the saturation adjustment unit can adjust the saturation correction value based on the predetermined reference color difference range.

[0224] According to some embodiments of the present invention, the predetermined reference color difference range may be greater than or equal to 0.004 and less than or equal to 0.02, or from about 0.004 to about 0.02.

[0225] According to some embodiments of the present invention, the saturation adjustment unit may be configured to adjust the saturation such that the color difference value calculated by the color difference comparison unit satisfies the predetermined reference color difference range, and the color difference comparison unit may be configured to output the second data when the calculated color difference value satisfies the predetermined reference color difference range.

[0226] According to some embodiments of the present invention, the output data may further include third data from other regions different from the residual image region.

[0227] According to some embodiments of the present invention, the predetermined gain value may be greater than or equal to 0.1 and less than or equal to 0.3, or from about 0.1 to about 0.3.

[0228] According to some embodiments of the present invention, the afterimage detection unit may be further configured to accumulate and average the data differences between the plurality of pixels in the previous frame and the current frame by using the image data to obtain an average frame of the data differences, and the afterimage detection unit may generate an afterimage region mask based on the average frame of the data differences, and use the afterimage region mask to detect and output the first data of the afterimage region from the image data of the current frame.

[0229] According to some embodiments of the present invention, the display device may further include a storage unit configured to store the first data and the second data in the form of a lookup table.

[0230] Those skilled in the art will readily recognize that various substitutions, modifications, and variations can be made within the scope of this invention without departing from its technical spirit and scope. Therefore, the scope of this invention is defined by the appended claims, and all variations or modifications derived from the meaning, scope, and equivalent concepts of the claims should be interpreted as being included within the scope of this invention.

Claims

1. A display device comprising: a residual image detection section configured to detect first data of a residual image area from image data; a saturation adjustment section configured to adjust a saturation of the first data of the residual image area detected by the residual image detection section and convert the first data into second data included in a predetermined reference color difference range, wherein the predetermined reference color difference range is from about 0.004 to about 0.02, wherein the saturation adjustment section is configured to: calculate a first saturation information value by performing a color space conversion on the first data of the residual image area; calculate a correction value that satisfies the first saturation information value within the predetermined reference color difference range; adjust the first saturation information value to a second saturation information value according to the correction value; convert data including the second saturation information value into the second data; calculate a color difference value between the first data and the second data; repeat adjustment of the second saturation information value by adjusting the correction value until the color difference value satisfies the predetermined reference color difference range; and a display panel including a plurality of pixels configured to display data including the second data output from the saturation adjustment section. 2.The display device according to claim 1, wherein the residual image detection section detects the first data of the residual image area by accumulating a data difference between adjacent frames of each of the plurality of pixels. 3.The display device according to claim 1, further comprising a storage section configured to store a first saturation information value corresponding to the first data and the correction value in a form of a lookup table, or store the first data and the second data in a form of a lookup table. 4.The display device according to claim 1, further comprising a storage section configured to store the correction value and a second saturation information value having a predetermined color difference value corresponding to the first saturation information value in a form of a lookup table, or store the first data and the second data in a form of a lookup table. 5.The display device according to claim 2, wherein the saturation adjustment section is configured to: calculate a first uniform chromaticity diagram and the first saturation information value by converting the first data of the residual image area with a color space conversion; adjust the first saturation information value to the second saturation information value according to the correction value; calculate a second uniform chromaticity diagram and the second data by converting the second saturation information value with a color space inverse conversion; and calculate a color difference value by comparing the first uniform chromaticity diagram with the second uniform chromaticity diagram. 6.The display device according to claim 5, further comprising a storage section configured to store the first uniform chromaticity diagram and the second uniform chromaticity diagram in a form of a lookup table. 7.The display device according to claim 1, further comprising: an image providing section including the residual image detection section and the saturation adjustment section, and configured to provide the second data of the residual image area and third data of other areas different from the residual image area. ​ a timing controller configured to output data received from the image providing section; a data driver configured to convert data supplied from the timing controller into a data voltage and apply the data voltage to a data line of the display panel; and a gate driver configured to drive a gate line of the display panel according to control by the timing controller.

8. The display device according to claim 1, further comprising: an image providing section configured to provide the image data; a timing controller including the ghost detection section and the saturation adjustment section, and configured to supply second data of the ghost area and third data of other areas different from the ghost area; a data driver configured to convert data supplied from the timing controller into a data voltage and apply the data voltage to a data line of the display panel; and a gate driver configured to drive a gate line of the display panel according to control by the timing controller.

9. The display device according to claim 1, further comprising: an image providing section configured to provide the image data; a timing controller configured to output image data received from the image providing section; a data driver including the ghost detection section and the saturation adjustment section, and configured to convert second data of the ghost area and third data of other areas different from the ghost area into a data voltage and output the data voltage to a data line of the display panel; and a gate driver configured to drive a gate line of the display panel according to control by the timing controller.

10. The display device according to claim 1, wherein the correction value is a gain value from about 0.1 to about 0.

3.

11. The display device according to claim 2, wherein the ghost detection section detects first data of the ghost area by accumulating and averaging data differences between preceding frames and a current frame in the plurality of pixels using the image data to obtain an average frame of the data differences.

12. The display device according to claim 11, wherein the ghost detection section generates a ghost area mask based on the average frame of the data differences, and detects and outputs first data of the ghost area from image data of the current frame using the ghost area mask.

13. A display device comprising: a display panel including a plurality of pixels; a controller configured to: receive image data; detect first data of a ghost area from the image data by accumulating data differences of each pixel between adjacent frames using the image data; adjust a saturation correction value based on the first data of the ghost area; correct the first data of the ghost area to second data based on the saturation correction value; and provide output data including the second data; and a circuit portion configured to provide a data signal to the plurality of pixels based on output data provided from the controller, wherein the controller includes: a residual image detection portion configured to detect first data of the residual image area from the image data; a saturation adjustment portion configured to determine a saturation correction value for the first data of the residual image area and correct the first data to include the second data within a predetermined reference color difference range, wherein the predetermined reference color difference range is from about 0.004 to about 0.02, wherein the saturation adjustment portion is configured to: calculate a first saturation information value by performing a color space conversion on the first data of the residual image area; calculate a correction value that satisfies the first saturation information value within the predetermined reference color difference range; adjust the first saturation information value to a second saturation information value from the correction value; convert data including the second saturation information value to the second data; calculate a color difference value between the first data and the second data; repeat adjusting the second saturation information value by adjusting the correction value until the color difference value satisfies the predetermined reference color difference range.

14. The display device according to claim 13, wherein the residual image detection portion masks an area from the image data in which a cumulative average of a data difference of each pixel between adjacent frames is less than a reference value and detects data of the masked area as the first data.

15. The display device according to claim 13, wherein the saturation correction value is a predetermined gain value.

16. The display device according to claim 13, wherein the controller includes: a residual image detection portion configured to detect first data of the residual image area from the image data; a first conversion portion configured to convert the first data to first color space data by converting the first data in a color space conversion; a first calculation portion configured to calculate a first uniform chromaticity diagram from the first data of the first conversion portion; a saturation adjustment portion configured to adjust a saturation of the first color space data based on the saturation correction value and correct the first color space data to second color space data; a second conversion portion configured to convert the second color space data to the second data by a color space inverse conversion; a second calculation portion configured to calculate a second uniform chromaticity diagram from the second data; and a color difference comparison portion configured to calculate a color difference value between the first uniform chromaticity diagram of the first calculation portion and the second uniform chromaticity diagram of the second calculation portion and compare the calculated color difference value with a predetermined reference color difference range.

17. The display device according to claim 16, wherein the saturation adjustment portion is configured to adjust a saturation such that the color difference value calculated by the color difference comparison portion satisfies the predetermined reference color difference range, and wherein the color difference comparison section is configured to output the second data when the calculated color difference value satisfies the predetermined reference color difference range.

18. The display device according to claim 13, wherein the output data further includes third data of other areas different from the residual image area.

19. The display device according to claim 15, wherein the predetermined gain value is from about 0.1 to about 0.

3.

20. The display device according to claim 13 or 16, wherein the residual image detection section is further configured to accumulate and average data difference between preceding frames and a current frame in the plurality of pixels by using the image data to obtain an average frame of the data difference, and the residual image detection section generates a residual image area mask based on the average frame of the data difference, and detects and outputs the first data of the residual image area from the image data of the current frame using the residual image area mask.

21. The display device according to claim 13, further comprising a storage section configured to store the first data and the second data in a look-up table form.

Images