Method for compensating luminance of a display device

Abstract

The present application relates to a method for compensating luminance of a display device. The method for compensating luminance of a display device according to some embodiments of the present disclosure includes capturing an image of the display device, generating imaging data, initially mapping display pixels of the display device and the imaging data such that a unit mapping area corresponding to the display pixels includes luminance values of image pixels of the imaging device, setting an offset value of the imaging data for the display pixels such that a maximum luminance value among the luminance values is located at a center of the unit mapping area, secondarily mapping the imaging data according to the offset value for the display pixels, calculating a representative luminance value, and setting a luminance correction value corresponding to the representative luminance value for one of the display pixels.

Description

[0001] Cross-reference to related applications

[0002] This application claims priority and benefit to Korean Patent Application No. 10-2020-0141481, filed on October 28, 2020, with the Korean Intellectual Property Office, the entire contents of which are incorporated herein by reference. Technical Field

[0003] Embodiments of this disclosure relate to methods and apparatus for compensating the brightness of a display device. Background Technology

[0004] In recent years, interest in information display has increased. Therefore, research and development in the technical fields related to display devices are ongoing. Summary of the Invention

[0005] This disclosure provides a method and apparatus for compensating the brightness of a display device to compensate for spots in the display device.

[0006] The purpose of this disclosure is not limited to the foregoing, and other purposes not mentioned will be clearly understood by those skilled in the art from the following description.

[0007] A method for compensating the brightness of a display device according to some embodiments of the present disclosure may include: capturing an image of the display device; generating imaging data; initially mapping the display pixels of the display device and the imaging data such that a unit mapping area corresponding to the display pixel includes the brightness value of the image pixel of the imaging device; setting an offset value of the imaging data for the display pixel such that the maximum brightness value among the brightness values ​​is located at the center of the unit mapping area; secondarily mapping the imaging data according to the offset value for the display pixel; calculating a representative brightness value; and setting a brightness correction value corresponding to the representative brightness value for one of the display pixels.

[0008] Capturing an image from a display device may include: driving the display device to display a test image as an image; and positioning an imaging device in front of the display device such that the image pixels are aligned with the display pixels.

[0009] Generating imaging data may include: detecting brightness values ​​using image pixels; and aligning brightness values ​​according to the position codes corresponding to the image pixels.

[0010] Display pixels and imaging data can be initially mapped based on the position codes of image pixels aligned with the display pixels.

[0011] Setting the offset value for imaging data can include: detecting the maximum brightness value and horizontal position in the horizontal direction for the brightness value of the horizontal line located at the center of the horizontal direction in the unit mapping area; setting a horizontal offset value in the horizontal direction so that the maximum brightness value in the horizontal direction is located at the center of the horizontal line; detecting the maximum brightness value and vertical position in the vertical direction for the brightness value of the vertical line located at the center of the vertical direction in the unit mapping area; and setting a vertical offset value in the vertical direction so that the maximum brightness value in the vertical direction is located at the center of the vertical line.

[0012] Setting the offset value for the imaging data may include: detecting the maximum brightness value and its position for brightness values ​​arranged in the unit mapping area; and setting the offset value for moving the brightness value of the imaging data so that the maximum brightness value is located at the center of the unit mapping area.

[0013] The secondary mapping of imaging data based on the offset value for the display pixel can include realigning the brightness value of the imaging data for the unit mapping area by moving the brightness value of the imaging data according to the offset value.

[0014] Calculating representative luminance values ​​may include calculating the sum or weighted sum of luminance values ​​that are realigned in the cell mapping region.

[0015] Setting a brightness correction value may include: detecting brightness deviation by comparing a representative brightness value with a reference value; and setting a brightness correction value to compensate for the brightness deviation.

[0016] The method may further include: storing the brightness correction value in the memory of the display device; and generating compensated image data by converting the input image data according to the brightness correction value.

[0017] The method may further include: generating a data signal corresponding to the compensated image data; and driving display pixels in response to the data signal.

[0018] An apparatus for compensating the brightness of a display device according to some embodiments of the present disclosure may include: an imaging device including image pixels and configured to generate imaging data by capturing a test image displayed on the display device; an image preprocessor configured to use the imaging data to calculate a corresponding representative brightness value of a display pixel disposed in the display device; and a correction value generator configured to generate brightness correction values ​​corresponding to the representative brightness values ​​for the display pixels respectively, wherein the image preprocessor is configured to initially map the display pixels and the imaging data such that a unit mapping area corresponding to the display pixel includes the brightness value of the image pixel, and wherein the image preprocessor is configured to set an offset value of the imaging data for the display pixel such that the maximum brightness value among the brightness values ​​is located at the center of the unit mapping area.

[0019] The image preprocessor may include: a first mapping unit configured to initially map display pixels and imaging data based on the position codes of image pixels; a maximum brightness detector configured to detect the position of the maximum brightness value relative to the unit mapping area; an offset value setting unit configured to set an offset value for the imaging data used to move the maximum brightness value to the center of the unit mapping area; a second mapping unit configured to remap the imaging data based on the offset value for the display pixels; and a representative value calculator configured to calculate a representative brightness value based on the brightness value remapped to the unit mapping area.

[0020] The maximum brightness detector can be configured to detect the maximum brightness value and horizontal position in the horizontal direction for the brightness value of the horizontal line located at the center of the cell mapping area, and the maximum brightness detector can be configured to detect the maximum brightness value and vertical position in the vertical direction for the brightness value of the vertical line located at the center of the cell mapping area.

[0021] The maximum brightness detector can be configured to detect the maximum brightness value and the location of the maximum brightness value within the cell mapping area.

[0022] The imaging device can be configured to detect the brightness value of image pixels and to align the brightness value of image pixels with the position of the image pixels to generate imaging data.

[0023] The device may also include a test image providing unit configured to provide a test image signal to a display device. Attached Figure Description

[0024] The accompanying drawings illustrate embodiments of the disclosed concept and, together with the specification, serve to explain aspects of the disclosed concept. The drawings are included to provide a further understanding of the disclosed concept and are incorporated in and constitute a part of this specification.

[0025] Figure 1 This is a diagram illustrating a brightness compensation system according to some embodiments of the present disclosure.

[0026] Figure 2 This is a block diagram illustrating a display device according to some embodiments of the present disclosure.

[0027] Figure 3 and Figure 4 This is a circuit diagram illustrating a display pixel according to an embodiment of the present disclosure.

[0028] Figure 5 This is a graph showing the brightness difference of each region of an image obtained by capturing a display device according to some embodiments of the present disclosure.

[0029] Figure 6This is a diagram illustrating an image preprocessor according to some embodiments of the present disclosure.

[0030] Figure 7 This is a diagram illustrating a method for mapping and displaying pixels and imaging data according to some embodiments of the present disclosure.

[0031] Figure 8 and Figure 9 This is a diagram illustrating a method for detecting maximum brightness according to an embodiment of the present disclosure.

[0032] Figure 10 This is a flowchart illustrating a method for compensating the brightness of a display device according to some embodiments of the present disclosure. Detailed Implementation

[0033] Some aspects of embodiments of this disclosure, and methods of implementing them, will be more readily understood by referring to the detailed description of the embodiments and the accompanying drawings. Hereinafter, embodiments will be described in more detail with reference to the accompanying drawings. However, the described embodiments may be implemented in many different forms and should not be construed as being limited only to the embodiments shown herein. Rather, these embodiments are provided as examples so that this disclosure will be comprehensive and complete, and will fully convey aspects of this disclosure to those skilled in the art. Therefore, processes, components, and techniques unnecessary for a full understanding of aspects of this disclosure by those skilled in the art are not described.

[0034] Unless otherwise stated, throughout the drawings and written description, the same reference numerals, symbols, or combinations thereof refer to the same elements, and therefore their descriptions will not be repeated. Additionally, portions unrelated to the description of the embodiments may be omitted for clarity.

[0035] In the accompanying drawings, the relative dimensions of elements, layers, and regions may be exaggerated for clarity. Therefore, the regions shown in the figures are schematic in nature, and their shapes are not intended to represent the actual shape of the regions of the device, nor are they intended to be limiting. Furthermore, as those skilled in the art will recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of this disclosure.

[0036] In the detailed description, numerous specific details are set forth for illustrative purposes to provide a thorough understanding of the various embodiments. However, it will be apparent that various embodiments may be implemented without these specific details or with one or more equivalent arrangements. In other instances, well-known structures and devices are shown in block diagram form to avoid unnecessarily obscuring the various embodiments.

[0037] In describing embodiments of this disclosure, the term "connection" may mean a physical connection and / or an electrical connection, and may mean a direct connection, an indirect connection, an integral connection, or a non-integral connection. It should be understood that when an element, layer, region, or component is referred to as being formed "on," "on," "connected to," or "linked" to another element, layer, region, or component, it may be directly formed on, directly on, directly connected to, or directly linked to another element, layer, region, or component, or indirectly formed on, indirectly on, indirectly connected to, or indirectly linked to another element, layer, region, or component, such that one or more intermediary elements, layers, regions, or components may be present. For example, when a layer, region, or component is referred to as "electrically connected" or "electrically coupled" to another layer, region, or component, it may be directly electrically connected or coupled to the other layer, region, and / or component, or there may be intermediary layers, regions, or components. However, "direct connection / direct coupling" means that one component is directly connected or coupled to another component in the absence of an intermediary component. Similarly, other expressions describing relationships between components, such as "between," "directly between," or "adjacent to," and "directly adjacent to," can be interpreted similarly. Furthermore, it should be understood that when an element or layer is referred to as being "between" two elements or layers, it can be the only element or layer between the two elements or layers, or there may be one or more intermediary elements or layers.

[0038] For the purposes of this disclosure, when following an element in a list, expressions such as “at least one of…” modify the elements of the entire list rather than individual elements within the list. For example, “at least one of X, Y, and Z” and “at least one selected from the group consisting of X, Y, and Z” can be interpreted as any combination or variation of two or more of X, Y, and Z, such as XYZ, XYY, YZ, and ZZ. Similarly, expressions such as “at least one of A and B” can include A, B, or A and B. As used herein, the term “and / or” includes any and all combinations of one or more of the related listed items. For example, expressions such as “A and / or B” can include A, B, or A and B.

[0039] It will be understood that although the terms “first,” “second,” “third,” etc., may be used herein to describe various elements, components, regions, layers, and / or parts, these elements, components, regions, layers, and / or parts should not be limited by these terms. These terms are used to distinguish one element, component, region, layer, or part from another element, component, region, layer, or part. Therefore, without departing from the spirit and scope of this disclosure, the first element, first component, first region, first layer, or first part described below may be referred to as a second element, second component, second region, second layer, or second part. The description of an element as a “first” element may not require or imply the presence of a second element or other elements. The terms “first,” “second,” etc., may also be used herein to distinguish elements of different categories or groups. For the sake of brevity, the terms “first,” “second,” etc., may respectively represent “first category (or first group),” “second category (or second group),” etc.

[0040] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this disclosure. As used herein, the singular forms “a” and “an” are intended to also include the plural forms unless the context clearly indicates otherwise. It will be further understood that, when used in this specification, the terms “comprises,” “comprising,” “have,” “having,” “includes,” and “including” specify the presence of the described features, integrals, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or combinations thereof.

[0041] As used herein, the terms “substantially,” “about,” “approximately,” and similar terms are used as approximate terms rather than as terms of degree and are intended to allow for inherent deviations in measured or calculated values ​​as would be recognized by one of ordinary skill in the art. As used herein, “about” or “approximately” includes the value as well as the average of the values ​​within an acceptable range of deviations from the particular value, as determined by one of ordinary skill in the art, taking into account the measurement in question and errors associated with the measurement of the particular quantity (i.e., limitations of the measurement system). For example, “about” may mean within one or more standard deviations, or within ±30%, ±20%, ±10%, ±5% of the value. Additionally, the word “may” as used in describing embodiments of this disclosure means “one or more embodiments of this disclosure.”

[0042] When one or more implementations can be carried out differently, a particular process sequence can be performed differently than the described sequence. For example, two consecutively described processes can be performed substantially simultaneously or in the reverse order of their description.

[0043] Electronic devices or electrical devices and / or any other related devices or components according to embodiments of this disclosure described herein can be implemented using any suitable hardware, firmware (e.g., application-specific integrated circuits), software, or a combination of software, firmware, and hardware. For example, various components of these devices may be formed on a single integrated circuit (IC) chip or on separate IC chips. Additionally, various components of these devices may be implemented on a flexible printed circuit film, tape-on-a-carrier package (TCP), printed circuit board (PCB), or formed on a substrate.

[0044] Furthermore, the various components of these devices can be processes or threads that run on one or more processors in one or more computing devices, execute computer program instructions, and interact with other system components for performing the various functions described herein. The computer program instructions are stored in memory implemented in the computing device using standard storage devices, such as, for example, random access memory (RAM). The computer program instructions may also be stored in other non-transitory computer-readable media, such as, for example, CD-ROMs, flash drives, etc. Additionally, those skilled in the art will recognize that, without departing from the spirit and scope of embodiments of this disclosure, the functions of various computing devices may be combined or integrated into a single computing device, or the functions of a particular computing device may be distributed across one or more other computing devices.

[0045] Unless otherwise defined, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. It should also be understood that terms, such as those defined in common dictionaries, shall be interpreted as having the same meaning as they have in the relevant field and / or the context of this specification, and shall not be interpreted in an idealized or overly formal sense unless expressly defined herein.

[0046] Figure 1 This is a diagram illustrating a brightness compensation system 10 according to some embodiments of the present disclosure. Figure 2 This is a block diagram illustrating a display device 100 according to some embodiments of the present disclosure. For example, Figure 2 An example of a display device 100 is shown. The display device 100 may be... Figure 1 The object of optical compensation in the brightness compensation system 10. Figure 3 and Figure 4 A display pixel DPX according to an embodiment of the present disclosure is shown. For example, Figure 3 and Figure 4 It shows that it can be arranged in Figure 2 Different implementations of the display pixels DPX in the display panel 110. Figure 5 This is a graph illustrating the brightness differences of each region of an image obtained by capturing a display device 100 according to some embodiments of the present disclosure. For example, Figure 5 It is a 3D curve graph, in which the brightness of each region of the image obtained by capturing some of the test images (i.e., a region of the test image) displayed by the display pixels DPX of the display device 100 is represented by contrast and height.

[0047] refer to Figure 1 The brightness compensation system 10 according to some embodiments of the present disclosure may include or correspond to the display device 100 and the brightness compensation device 200.

[0048] In the following text, we will first refer to Figures 2 to 4 The basic configuration of the display device 100 will be described, and then the configuration of the brightness compensation device 200 will be described.

[0049] refer to Figure 2 The display device 100 may include a display panel 110, a timing controller 120, a scan driver 130, a data driver 140, a memory 150, and a compensator 160.

[0050] The display panel 110 may include multiple scan lines SL1 to SLn, multiple data lines DL1 to DLm, and multiple display pixels DPX. Figure 2 The display panel 110 may include display pixels (DPX) arranged in a display area (e.g., a predetermined display area) to configure Figure 1 The screen of display device 100. In Figure 2 In this embodiment, the display panel 110 may be shown as a configuration separate from the timing controller 120, scan driver 130, data driver 140, memory 150, and compensator 160. However, according to an embodiment, at least one of the timing controller 120, scan driver 130, data driver 140, memory 150, and compensator 160 (e.g., scan driver 130 and / or data driver 140) may be formed or mounted in the display panel 110.

[0051] The display pixel DPX can be connected to at least one of scan lines SL1 to SLn and at least one of data lines DL1 to DLm. The display pixel DPX can receive voltages from an externally supplied first power supply VDD and a second power supply VSS. Here, the first power supply VDD and the second power supply VSS can be driving power supplies suitable for operating the display pixel DPX, and can provide different voltage levels to the display pixel DPX.

[0052] refer to Figure 3 and Figure 4Each of the display pixels DPX may include a light-emitting unit (EMU) and a pixel circuit (PXC). The light-emitting unit (EMU) includes at least one light-emitting element (LD), and the pixel circuit (PXC) is used to drive the light-emitting unit (EMU).

[0053] The pixel circuit PXC can be connected between the first power supply VDD and the light-emitting unit EMU. Furthermore, the pixel circuit PXC can be connected to the scan line SL and data line DL of the corresponding display pixel DPX, and can control the operation of the light-emitting unit EMU in response to the scan signals and data signals provided from the scan line SL and data line DL, respectively.

[0054] A pixel circuit (PXC) may include at least one transistor and a capacitor. For example, a pixel circuit (PXC) may include a first transistor M1, a second transistor M2, and a storage capacitor Cst.

[0055] The first transistor M1 can be connected between the first power line PL1, which is supplied with the voltage of the first power supply VDD, and the first electrode ELT1 (e.g., the anode electrode) of the light-emitting unit EMU. Furthermore, the gate electrode of the first transistor M1 can be connected to the first node N1. The first transistor M1 can control the driving current supplied to the light-emitting unit EMU in response to the voltage of the first node N1. That is, the first transistor M1 can be a driving transistor that controls the driving current of the display pixel DPX.

[0056] The second transistor M2 can be connected between the data line DL and the first node N1. Furthermore, the gate electrode of the second transistor M2 can be connected to the scan line SL. When a scan signal with a conduction level (e.g., high level) pulse is provided from the scan line SL, the second transistor M2 can be turned on to connect the data line DL and the first node N1.

[0057] In each frame cycle, the data signal for the corresponding frame can be provided to the data line DL, and the data signal can be transmitted to the first node N1 via the second transistor M2, which is turned on during the cycle of providing a scan signal with an on level. That is, the second transistor M2 can be a switching transistor used to transmit each data signal to the interior of the display pixel DPX.

[0058] One electrode of the storage capacitor Cst can be connected to the first node N1, and the other electrode can be connected to the second electrode of the first transistor M1. The storage capacitor Cst can be charged with a voltage corresponding to the data signal supplied to the first node N1 during each frame period.

[0059] exist Figure 3 and Figure 4For ease of description, a display pixel DPX with a relatively simple structure is shown, and the structure of the pixel circuit PXC and its driving method can be varied according to other embodiments. For example, the pixel circuit PXC may also include at least one transistor, such as a sensing transistor for sensing characteristic information of the first transistor M1 and / or the light-emitting unit EMU, a compensation transistor for compensating the threshold voltage of the first transistor M1, an initialization transistor for initializing the first node N1, and / or an emission control transistor for controlling the emission time (or emission period) of the light-emitting unit EMU. Furthermore, the pixel circuit PXC may also include circuit elements such as a boost capacitor for boosting the voltage of the first node N1.

[0060] In addition, Figure 3 and Figure 4 In the present invention, the transistors (e.g., the first transistor M1 and the second transistor M2) included in the pixel circuit PXC are shown as N-type transistors, but the present disclosure is not limited thereto. That is, at least one of the transistors included in the pixel circuit PXC may be changed to a P-type transistor.

[0061] In other embodiments, when the display pixel DPX is a pixel of a passive light-emitting display device, the pixel circuit PXC can be omitted. In this case, the light-emitting unit EMU can be directly connected to the scan line SL, data line DL, first power line PL1, second power line PL2 and / or other signal lines or power lines.

[0062] The light-emitting unit (EMU) may include at least one light-emitting element (LD) connected between a second power line PL2, which is supplied with the voltage of a second power supply VSS, and a pixel circuit PXC.

[0063] In some implementations, such as Figure 3 As shown, the light-emitting unit (EMU) may include multiple light-emitting elements (LDs) connected in parallel with each other. Each LD may have a size ranging from nanometer to micrometer, or may be a micro-inorganic light-emitting diode with a size not limited thereto. However, this disclosure is not limited thereto. Furthermore, each LD may be an inorganic light-emitting diode with a rod-shaped or core-shell structure fabricated by growing a nitride-based semiconductor, but this disclosure is not limited thereto.

[0064] For example, a light-emitting unit (EMU) may include a first electrode ELT1 (also called a first pixel electrode or first alignment electrode) connected to a first power supply VDD via a pixel circuit PXC and a first power line PL1, a second electrode ELT2 (also called a second pixel electrode or second alignment electrode) connected to a second power supply VSS via a second power line PL2, and a plurality of light-emitting elements LDs connected between the first electrode ELT1 and the second electrode ELT2. According to some embodiments, the first electrode ELT1 of the light-emitting unit EMU may be an anode electrode, and the second electrode ELT2 may be a cathode electrode, but this disclosure is not limited thereto.

[0065] In some implementations, the light-emitting unit (EMU) may include multiple light-emitting elements (LDs) connected in parallel in the same direction between the first electrode ELT1 and the second electrode ELT2. For example, each light-emitting element LD may include a first terminal EP1 (e.g., a P-type terminal) connected to the first power supply VDD via the first electrode ELT1 and / or pixel circuit PXC, and a second terminal EP2 (e.g., an N-type terminal) connected to the second power supply VSS via the second electrode ELT2. That is, the light-emitting elements LD may be connected in parallel in the forward direction between the first electrode ELT1 and the second electrode ELT2.

[0066] although Figure 3 This disclosure corresponds to an embodiment where the display pixel DPX includes a light-emitting unit (EMU) with a parallel structure, but is not limited thereto. For example, the display pixel DPX may include a light-emitting unit (EMU) with a series structure or a series / parallel structure. In this case, the light-emitting unit (EMU) may include multiple light-emitting elements (LDs) connected between the first electrode ELT1 and the second electrode ELT2 in a series or series / parallel structure. As an example, the light-emitting unit (EMU) may include, for example... Figure 4 Multiple light-emitting elements (LDs) are divided into two series stages and connected in a manner similar to those in the example.

[0067] refer to Figure 4 The light-emitting unit (EMU) may include a first electrode ELT1, a second electrode ELT2, and multiple light-emitting elements (LDs) connected in series / parallel between the first electrode ELT1 and the second electrode ELT2.

[0068] As an example, the light-emitting unit (EMU) may include a first electrode ELT1, a second electrode ELT2, and at least one intermediate electrode IET connected between the first electrode ELT1 and the second electrode ELT2. Some light-emitting elements (LDs) may be connected in the forward direction between the first electrode ELT1 and the intermediate electrode IET, and other light-emitting elements (LDs) may be connected in the forward direction between the intermediate electrode IET and the second electrode ELT2. Therefore, the light-emitting elements (LDs) may be connected in series or in parallel between the first electrode ELT1 and the second electrode ELT2.

[0069] For example, at least one first light-emitting element LD1 can be connected between the first electrode ELT1 and the intermediate electrode IET. The first light-emitting element LD1 may include a P-type first terminal EP1 connected to the first electrode ELT1 and an N-type second terminal EP2 connected to the intermediate electrode IET.

[0070] At least one second light-emitting element LD2 may be connected between the intermediate electrode IET and the second electrode ELT2. The second light-emitting element LD2 may include a P-type first terminal EP1 connected to the intermediate electrode IET and an N-type second terminal EP2 connected to the second electrode ELT2. According to some embodiments, the number of second light-emitting elements LD2 may be the same as or different from the number of first light-emitting elements LD1.

[0071] although Figure 4 A light-emitting unit (EMU) with a two-stage series / parallel structure is shown, but this disclosure is not limited thereto. For example, the EMU can be configured with three or more stages of series structure and / or series / parallel structure.

[0072] As described above, each light-emitting element (LD) connected in the forward direction between the first power supply VDD and the second power supply VSS can constitute each effective light source. Furthermore, these effective light sources can constitute the light-emitting unit (EMU) of the display pixel DPX.

[0073] When a drive current is provided through the corresponding pixel circuit (PXC), the light-emitting element (LD) can emit light with a brightness corresponding to the drive current. For example, during each frame period, the pixel circuit (PXC) can provide a drive current to the light-emitting unit (EMU) corresponding to the grayscale value represented in the corresponding frame. Therefore, when the light-emitting element (LD) emits light due to the drive current, the light-emitting unit (EMU) can exhibit a brightness corresponding to the drive current.

[0074] In this way, the display pixels DPX included in the display panel 110 can display images by controlling the magnitude of the driving current supplied to the light-emitting unit EMU according to the data signal.

[0075] Typically, display panels 110 manufactured using the same process should have identical brightness characteristics. However, in practice, due to variations in the manufacturing process, some display panels 110 may not exhibit the same brightness characteristics as others. Furthermore, the brightness characteristics of display pixels (DPXs) can be set differently between the initial design time and the time after the manufacturing process is completed. This variation in brightness characteristics can differ for each display panel 110 or for each display pixel (DPX) included in a single display panel 110. For this reason, even if the same data signal is provided to the display pixels (DPXs), brightness discrepancies may occur between them. Consequently, image quality distortion, such as color difference, may occur on the display panel 110. Therefore, to compensate for image quality distortion, a suitable brightness compensation process can be performed before shipping the display panel 110.

[0076] In addition, such as Figure 3 and Figure 4 As shown in the implementation, when each of the display pixels DPX includes multiple light-emitting elements (LDs), the deviation in the number of LDs connected to each light-emitting unit (EMU) in the forward direction and / or the distribution characteristics of the LDs can be different for each display pixel DPX. For example, in the process of manufacturing the pixels of the display device 100, the LDs can be self-aligned between the respective electrodes by an electric field formed between the electrodes (e.g., the first electrode ELT1 and the second electrode ELT2 and / or at least one intermediate electrode IET) formed in the emission region of each display pixel DPX. In this case, even if the electrodes of the display pixel DPX are formed at substantially the same location in each emission region, deviations in the number of LDs aligned in the forward direction and connected between the electrodes may occur. Furthermore, depending on the alignment position of each LD, the distribution characteristics of the LDs can be different for each display pixel DPX. For this reason, the brightness distribution characteristics can be different for each of the display pixels DPX. As an example, such as Figure 5 As shown, multiple adjacent display pixels (DPX) can exhibit different brightness distribution characteristics.

[0077] refer to Figures 1 to 5 For each display pixel DPX, the brightness of the test image displayed in each of the four display pixels DPX along the horizontal direction (X-axis direction) and the vertical direction (Y-axis direction) can be different. Furthermore, even within a single area of ​​the test image corresponding to each display pixel DPX, the brightness distribution characteristics can be different for each display pixel DPX.

[0078] As an example, such as Figure 5As shown by the dashed line, even if the four display pixels DPX are arranged in a row along the vertical direction (Y-axis direction) to have the same X code (or X coordinate), the positions of the peak brightness points of the four display pixels DPX can have different X codes.

[0079] exist Figure 5 In order to illustrate the brightness distribution characteristics of each region within each display pixel DPX, multiple image pixels disposed in the imaging device 220 can be aligned for each display pixel DPX. Furthermore, by representing the brightness value detected from each image pixel in terms of contrast and height, an image in which the brightness distribution of the display pixel DPX is accurately captured for each region can be obtained. For example, in Figure 5 In this configuration, 11 image pixels are aligned horizontally and vertically relative to each display pixel DPX (i.e., a total of 121 image pixels), and the brightness value detected from each image pixel can be represented by contrast and height.

[0080] As described above, in a display device 100 having different brightness distribution characteristics of display pixels (DPX), in order to effectively compensate for brightness deviations of the display pixels (DPX), the brightness of the display pixels (DPX) should be compensated by taking into account the brightness distribution characteristics represented by each display pixel (DPX). To this end, according to some embodiments, a brightness compensation device 200 can generate a brightness correction value (LCV) more accurately for each display pixel (DPX) through a process of preprocessing the imaging data (CID) of the display pixels (DPX). A detailed description of the configuration and operation of the brightness compensation device 200 will be described later.

[0081] Refer again Figure 2 The timing controller 120 can receive control signals provided externally (e.g., from a graphics processor) and can receive compensated image data CGD from the compensator 160. The timing controller 120 can generate scan control signals SCS and data control signals DCS based on the control signals, can realign the compensated image data CGD, and can generate realigned image data DATA. Here, the control signals may include vertical synchronization signals, horizontal synchronization signals, clock signals, etc.

[0082] The scan driver 130 can generate scan signals based on the scan control signal SCS provided from the timing controller 120. Here, the scan control signal SCS may include a scan start signal, a scan clock signal, etc. The scan driver 130 can sequentially provide scan signals with on-level pulses to scan lines SL1 to SLn.

[0083] The data driver 140 can generate a data signal (e.g., a data voltage) based on image data DATA and a data control signal DCS provided from the timing controller 120, and can provide the data signal to data lines DL1 to DLm. The data driver 140 can also generate a data signal in analog form based on image data DATA in digital form. For example, the data driver 140 can sample grayscale values ​​included in the image data DATA, generate a data voltage corresponding to the grayscale values ​​as a data signal, and provide the data signal to data lines DL1 to DLm in pixel-line units. Here, the data control signal DCS may include a data clock signal, a data enable signal, etc.

[0084] The memory 150 can store a brightness correction value (LCV), which is used to compensate for image quality distortion on the display panel 110 caused by brightness deviations in the display pixels (DPX). The brightness correction value (LCV) can be generated by... Figure 1 The brightness compensation device 200 generates it.

[0085] Here, a luminance correction value (LCV) can be generated for each of the display pixels (DPX) and stored in memory 150. Alternatively, a certain number (e.g., a predetermined number) of display pixels (DPX) can be configured as blocks, and a luminance correction value (LCV) can be generated for each block of display pixels (DPX) and stored in memory 150. Hereinafter, some implementations of generating a luminance correction value (LCV) for each display pixel (DPX) will be described.

[0086] The memory 150 may be configured as a separate unit within the display device 100, but this disclosure is not limited thereto. For example, the memory 150 may be embedded in the timing controller 120 or the data driver 140.

[0087] The compensator 160 can receive externally provided input image data (e.g., from a graphics processor) and can read the luminance correction value LCV stored in memory 150. The compensator 160 can generate compensated image data CGD, which can be obtained by converting the input image data based on the luminance correction value LCV, and can provide the compensated image data CGD to the timing controller 120. Figure 2 In this disclosure, timing controller 120 and compensator 160 are shown as separate components, but this disclosure is not limited thereto. For example, timing controller 120 and compensator 160 may be configured as a whole. As an example, compensator 160 may be embedded in timing controller 120.

[0088] The brightness of the display pixel DPX can be corrected based on the compensated image data CGD generated according to the brightness correction value LCV of the display pixel DPX. Therefore, image quality distortion on the display panel 110 can be compensated.

[0089] Recombined Figures 2 to 5 refer to Figure 1 The brightness compensation system 10 may include a display device 100 to undergo optical compensation, and may include a brightness compensation device 200 that generates a brightness correction value (LCV) for optically compensating spots in the display device 100.

[0090] The display device 100 may include display pixels (DPX) disposed in the display panel 110, and may display an image on the display panel 110 (e.g., in the display area where the display pixels (DPX) are disposed) in response to image data DATA provided from an external source. Furthermore, in the optical compensation step, the display device 100 may display a test image in the display area in response to test image data TID provided from the brightness compensation device 200.

[0091] In some embodiments, the display device 100 may be a self-emissive display device, wherein at least one light-emitting element LD (e.g., organic light-emitting diode or inorganic light-emitting diode) is located in each display pixel DPX, but this disclosure is not limited thereto. For example, the display device 100 may be another type of display device, such as a liquid crystal display device or an electrophoretic display device.

[0092] After the manufacturing process is completed, the display device 100 may undergo an inspection process to detect spots (such as color difference) on the display panel 110. When a spot is detected during the inspection, it is removed by a brightness compensation process for the display device 100.

[0093] As an example, after driving display device 100 to display a test image on display device 100, an image of display device 100 (e.g., a test image displayed by display pixels DPX in display panel 110) can be captured by imaging device 220, and an optical compensation process can be performed to analyze the captured image and store a luminance correction value (LCV) for removing speckles from display device 100. The stored luminance correction value (LCV) can be used to convert input image data to generate compensated image data (CGD) when driving display device 100. Therefore, an image with speckles removed can be displayed on display device 100.

[0094] The brightness compensation device 200 can provide test image data TID to the display device 100 and can capture a test image displayed on the display panel 110 of the display device 100 (e.g., a test image displayed in a display area where display pixels DPX are arranged) to generate imaging data CID. Furthermore, the brightness compensation device 200 can generate a brightness correction value LCV corresponding to the imaging data CID (e.g., a grayscale change value or compensation grayscale value for each display pixel DPX). For this purpose, the brightness compensation device 200 may include a test image providing unit 210, an imaging device 220, an image preprocessor 230, and a correction value generator 240.

[0095] exist Figure 1 In this embodiment, the test image providing unit 210 and the imaging device 220 are included in the brightness compensation device 200, but this disclosure is not limited thereto. For example, at least one of the test image providing unit 210 and the imaging device 220 may be configured to be separate from the other components of the brightness compensation device 200.

[0096] The test image providing unit 210 can provide test image data TID to the display device 100. For example, during the optical compensation process of the display device 100, the test image providing unit 210 can provide the display device 100 with at least one test image data TID corresponding to at least one reference gray level.

[0097] Imaging device 220 may include a plurality of image pixels (e.g., CMOS image pixels) and may generate imaging data CID by capturing images of display device 100 (e.g., test images displayed on display device 100). In some embodiments, imaging device 220 may be a two-dimensional charge-coupled device (CCD) camera, such as a region scan camera and a frame camera, but this disclosure is not limited thereto.

[0098] The imaging data CID may include brightness information of the test image displayed on the display device 100. As an example, the imaging data CID may include brightness mapping data, which includes brightness information corresponding to each of the image pixels used to capture the test image (e.g., CMOS image pixels set in the imaging device 220). Furthermore, in addition to the brightness information of the image pixels, the imaging data CID may also include additional information. For example, the imaging data CID may also include color (or chromaticity) information.

[0099] In some embodiments, high-resolution imaging data CID can be generated by aligning a plurality of image pixels of imaging device 220 relative to each of display pixels (DPX) of display device 100 and by capturing an image of display device 100. For example, imaging device 220 can generate imaging data CID by detecting the luminance value of each of the image pixels based on the output signal of the image pixels and by aligning the luminance values ​​in response to the position of the image pixels. In this case, the imaging data CID may include a plurality of luminance values ​​arranged in each cell mapping region corresponding to each of the display pixels (DPX). The plurality of luminance values ​​may correspond to the luminance values ​​of a plurality of image pixels aligned to each of the display pixels (DPX). In other embodiments, imaging device 220 may provide only the output signal of the image pixels to image preprocessor 230. In this case, image preprocessor 230 can generate imaging data CID by aligning the corresponding luminance values ​​based on the position of the image pixels.

[0100] The imaging data CID generated by the imaging device 220 can be input into the image preprocessor 230.

[0101] Image preprocessor 230 can use imaging data CID to calculate a representative luminance value RLV for each display pixel DPX. In some embodiments of this disclosure, image preprocessor 230 can more accurately perform secondary / secondary mapping (or secondary / secondary alignment) relative to the imaging data CID of the primary / secondary mapping (or primary / secondary alignment) of each display pixel DPX based on the luminance distribution characteristics of each display pixel DPX. Image preprocessor 230 can calculate the representative luminance value RLV more accurately, thereby reflecting the luminance distribution characteristics represented by each display pixel DPX. Therefore, the luminance compensation performance of the display pixel DPX can be improved. A detailed description of the configuration and operation of image preprocessor 230 will be given later.

[0102] The representative brightness value RLV of the display pixel DPX generated by the image preprocessor 230 can be input into the correction value generator 240.

[0103] The correction value generator 240 can generate a luminance correction value LCV, which corresponds to a representative luminance value RLV for each of the display pixels DPX. For example, the correction value generator 240 can compare the representative luminance value RLV of each display pixel DPX with a reference value (e.g., a predetermined reference value, average value, median value, or maximum value of the representative luminance values ​​RLV of the display pixel DPX), and generate a luminance correction value LCV for each display pixel DPX based on the comparison result, thereby compensating for luminance deviations in the display pixel DPX. In some embodiments, the luminance correction value LCV can be a grayscale level variation value or a compensation grayscale level for each of the display pixels DPX.

[0104] Figure 6 This is a diagram illustrating an image preprocessor 230 according to some embodiments of the present disclosure. For example, Figure 6 It shows that it can be set to Figure 1 Some embodiments of the image preprocessor 230 in the brightness compensation device 200. Figure 7 This is a diagram illustrating a method for mapping and displaying pixel DPX and imaging data CID according to some embodiments of the present disclosure. For example, Figure 7 It shows that Figure 6 Some implementations of the method by which the image preprocessor 230 maps imaging data CID to a unit mapping region UMA corresponding to each display pixel DPX. Figure 8 and Figure 9 This is a diagram illustrating a method for detecting maximum brightness according to an embodiment of the present disclosure.

[0105] exist Figure 7 This document describes some implementations of imaging data CID, which includes luminance values ​​L(x, y) of image pixels captured based on a unit mapping area UMA corresponding to any one of the display pixels DPX and the periphery of the display pixel DPX. In some implementations, the luminance values ​​L(x, y) of the image pixels included in the imaging data CID may be arranged at positions corresponding to each image pixel (e.g., positions corresponding to the X and Y codes assigned to the image pixel), and the luminance values ​​L(x, y) of the image pixels may be represented by contrast based on luminance. Additionally, the imaging data CID may selectively include color information for each region of the test image. For example, the imaging data CID may be formed in the form of color-luminance mapping data.

[0106] For convenience, Figure 7In this example, some implementations will be described where 25 image pixels arranged in a 5×5 pattern (5 in the horizontal direction (X direction) and 5 in the vertical direction (Y direction)) are aligned with a display pixel DPX to capture an image of a display device, and where imaging data CID generated from the captured image is mapped to a unit mapping area UMA corresponding to each display pixel DPX. However, according to the implementation, the number of image pixels aligned with a display pixel DPX can be varied.

[0107] First, combined Figures 1 to 5 refer to Figure 6 and Figure 7 The image preprocessor 230 can initially map the display pixel DPX and the imaging data CID such that the unit mapping region UMA corresponding to each of the display pixel DPX includes multiple luminance values ​​L(x, y) of multiple image pixels. Subsequently, the image preprocessor 230 can calculate the representative luminance value RLV of each display pixel DPX by performing a secondary mapping (remapping or realigning) of each display pixel DPX and the imaging data CID such that the maximum luminance value P_L(x, y) is located at the center of the unit mapping region UMA.

[0108] For this purpose, the image preprocessor 230 may include a first mapping unit 231, a maximum brightness detector 232, an offset value setting unit 233, a second mapping unit 234, and a representative value calculator 235.

[0109] The first mapping unit 231 can initially map and display the pixel DPX and imaging data CID based on the position code (or coordinates) (x, y) of the image pixel. For example, the first mapping unit 231 can initially map and display the pixel DPX and imaging data CID based on the X code (or X coordinate) given according to the horizontal position and the Y code (or Y coordinate) given according to the vertical position relative to each image pixel.

[0110] The maximum brightness detector 232 can detect the maximum brightness value P_L(x,y) and its position among multiple brightness values ​​L(x,y) arranged in each unit mapping area UMA by the first mapping unit 231.

[0111] In some implementations, such as Figure 8 As shown, the maximum brightness detector 232 can detect the maximum brightness value by comparing the brightness values ​​L(x, y) of a horizontal line HL and a vertical line VL in the horizontal direction (X-axis direction) and the vertical direction (Y-axis direction), respectively. Figure 7 The maximum brightness value P_L(x, y) and / or its position in the image.

[0112] For example, in the horizontal direction, the maximum brightness detector 232 can detect the maximum brightness value and its position (e.g., position code) by comparing the brightness values ​​L(x, y) of the horizontal line located at the center of the unit mapping region UMA (e.g., the third horizontal line HL3) within the horizontal line HL extending along the horizontal direction (e.g., among the five horizontal lines of the unit mapping region UMA). Furthermore, the maximum brightness detector 232 can select the X code at the location where the maximum brightness value in the horizontal direction is arranged as the X code of the maximum brightness value.

[0113] Furthermore, in the vertical direction, the maximum brightness detector 232 can detect the maximum brightness value and its position (e.g., position code) by comparing the brightness values ​​L(x, y) of the vertical line located at the center of the unit mapping region UMA (e.g., the third vertical line VL3) among the five vertical lines extending along the vertical direction (e.g., L(5, 3), L(5, 4), L(5, 5), L(5, 6), L(5, 7)) with each other. Additionally, the maximum brightness detector 232 can select the Y code at the location where the maximum brightness value in the vertical direction is arranged as the Y code of the maximum brightness value.

[0114] Subsequently, the maximum brightness detector 232 can detect the maximum brightness value by combining the detected X code and Y code (e.g., Figure 7 The position of the maximum brightness value P_L(x, y) in the image.

[0115] In other embodiments, such as Figure 9 As shown, the maximum brightness detector 232 can detect the maximum brightness value by comparing the brightness values ​​L(x,y) with each other, using all brightness values ​​L(x,y) located in each cell mapping region UMA as targets (e.g., Figure 7 The maximum luminance value P_L(x, y) in the image and its position (e.g., position code).

[0116] Refer again Figure 6 and Figure 7 Information about the maximum brightness value P_L(x, y) detected by the maximum brightness detector 232 (e.g., position code) can be input to the offset value setting unit 233.

[0117] The offset setting unit 233 can set an offset value for the imaging data CID used to move the maximum luminance value P_L(x, y) to the center of the corresponding unit mapping region UMA. As an example, the offset value can be an offset value used to change the position code of the luminance value L(x, y) included in the imaging data CID, such that the maximum luminance value P_L(x, y) arranged in each unit mapping region UMA is located at the center of the unit mapping region UMA.

[0118] For example, such as Figure 7 As shown, when the maximum brightness value P_L(x, y) is located at the center of the unit mapping region UMA in the horizontal direction and is located one row ahead of or away from the center of the unit mapping region UMA in the vertical direction, the horizontal offset value can be set to 0, and the vertical offset value can be set to 1. Therefore, the offset value to be applied to move (e.g., shift along the horizontal and / or vertical directions) the imaging data CID can be set to (0, 1).

[0119] In some implementations, when detecting the maximum brightness value and its position in the horizontal direction and the maximum brightness value and its position in the vertical direction separately, a horizontal offset value can be set so that the maximum brightness value in the horizontal direction is located at the center of the corresponding horizontal line, and a vertical offset value can be set so that the maximum brightness value in the vertical direction is located at the center of the corresponding vertical line. Furthermore, the final offset value can be set by combining the offset values ​​set separately for the horizontal and vertical directions.

[0120] The offset value set by the offset value setting unit 233 can be input to the second mapping unit 234.

[0121] The second mapping unit 234 can remap the imaging data CID based on the offset value set for each of the display pixels DPX. Therefore, the display pixels DPX and imaging data CID can be mapped (or aligned) more accurately based on the brightness distribution characteristics of each display pixel DPX.

[0122] As an example, such as Figure 7 As shown, when an offset value (0, 1) is set for any display pixel DPX, the second mapping unit 234 can move the imaging data CID by +1 in the Y code of the position code corresponding to the luminance value L(x, y) of the imaging data CID relative to the unit mapping region UMA corresponding to the display pixel DPX, thereby shifting the imaging data CID by +1 in the Y-axis direction. Therefore, the maximum luminance value P_L(x, y) detected in each unit mapping region UMA can be located at the center of the corresponding unit mapping region UMA.

[0123] The brightness value L(x, y) of each unit mapping region UMA, which is second-mapped by the second mapping unit 234, can be input into the representative value calculator 235.

[0124] The representative value calculator 235 can calculate the representative luminance value RLV for each display pixel DPX based on the luminance value L(x, y) of the secondary mapping relative to each unit mapping region UMA. As an example, the representative value calculator 235 can set the value obtained by summing all luminance values ​​L(x, y) included in each unit mapping region UMA, or by summing some of the luminance values ​​L(x, y) that at least include the maximum luminance value P_L(x, y), as the representative luminance value RLV for each display pixel DPX.

[0125] Furthermore, to reduce or eliminate noise caused by surrounding display pixels (DPX), the representative value calculator 235 can apply a weighted summation method using a Gaussian filter or similar method to set the representative luminance value (RLV) for each display pixel (DPX). Additionally, the representative value calculator 235 can calculate the representative luminance value (RLV) for each display pixel (DPX) using another representative value calculation method.

[0126] The representative luminance value RLV generated by the representative value calculator 235 can be input into the correction value generator 240 and can be used to generate a luminance correction value LCV to compensate for the characteristic deviation of the display pixel DPX.

[0127] Figure 10 This is a flowchart illustrating a method for compensating the brightness of a display device 100 according to some embodiments of the present disclosure. For example, Figure 10 An optical compensation method for setting a luminance correction value (LCV) to compensate for luminance deviations in display pixel DPX is shown step by step.

[0128] In the following text, together with Figures 1 to 9 refer to Figure 10 This describes a method for compensating the brightness of a display device 100 according to some embodiments of the present disclosure.

[0129] ST10: Display test image

[0130] For optical compensation, firstly, the display device 100 can be driven to display the test image. For this purpose, the brightness compensation device 200 can provide the test image data TID to the display device 100. In other embodiments, the test image data (e.g., predetermined test image data) TID can be pre-stored in the display device 100.

[0131] ST20: Captures test images and generates imaging data

[0132] When the display device 100 displays a test image, an image of the display device 100 can be captured, and thus imaging data CID can be generated. For example, the imaging device 220 can be located in front of the display device 100 such that multiple image pixels are aligned with each of the display pixels DPX, and a test image displayed on the display device 100 can be captured to generate imaging data CID.

[0133] In some embodiments, imaging data CID can be generated by detecting luminance values ​​L(x, y) from a plurality of image pixels and by aligning the detected luminance values ​​L(x, y) with a position code corresponding to each of the plurality of image pixels. In some embodiments, the imaging data CID may be generated by imaging device 220, but this disclosure is not limited thereto. For example, the imaging data CID may be generated by image preprocessor 230 or a separate imaging data generator.

[0134] ST30: Initial mapping displays pixel and imaging data

[0135] After generating the imaging data CID, the display pixel DPX (or the corresponding unit mapping region UMA) and the imaging data CID can be initially mapped such that the unit mapping region UMA corresponding to each of the display pixels DPX includes the brightness values ​​L(x, y) of multiple image pixels. For example, the display pixel DPX and its corresponding imaging data CID can be initially mapped such that each unit mapping region UMA includes the brightness values ​​L(x, y) of multiple image pixels based on the position codes of multiple image pixels aligned relative to each display pixel DPX.

[0136] ST40: Location for detecting maximum brightness value

[0137] When the initial mapping is completed, the maximum luminance value P_L(x,y) and / or its position in the luminance value L(x,y) of the unit mapping area UMA arranged relative to each of the display pixels DPX can be detected.

[0138] In some implementations, such as Figure 8 As shown, the maximum luminance value in the horizontal direction and the maximum luminance value in the vertical direction can be detected by targeting the luminance value L(x, y) arranged on any horizontal line HL and vertical line VL, and the position of the maximum luminance value P_L(x, y) in the corresponding cell mapping region UMA can be detected based on the detected maximum luminance value. As an example, the position of the maximum luminance value P_L(x, y) can be defined by the position code having the X code of the maximum luminance value in the horizontal direction and the Y code of the maximum luminance value in the vertical direction.

[0139] In other embodiments, such as Figure 9As shown, the maximum luminance value P_L(x,y) can be detected by targeting all of the luminance values ​​L(x,y) arranged in each unit mapping region UMA, and the position code of the point where the maximum luminance value P_L(x,y) is arranged can be detected.

[0140] ST50: Set the offset value for imaging data

[0141] When the maximum luminance value P_L(x, y) and / or its position in each unit mapping region UMA is detected, an offset value for the imaging data CID can be set for each display pixel DPX. For example, for each of the display pixels DPX, an offset value for the imaging data CID can be set such that the maximum luminance value P_L(x, y) among the luminance values ​​L(x, y) included in the corresponding unit mapping region UMA is located at the center of the unit mapping region UMA. In some embodiments, the offset value may be a value corresponding to a movement amount (e.g., a predetermined amount) used to move the luminance value L(x, y) included in the imaging data CID by a certain amount in the horizontal and / or vertical directions. On the other hand, in at least one unit mapping region UMA, when the maximum luminance value P_L(x, y) is located at the center, the offset value can be set to (0, 0) such that the imaging data CID corresponding to the corresponding unit mapping region UMA does not move from the position of the initial mapping.

[0142] ST60: Secondary mapping displays pixel and imaging data

[0143] After setting the offset value for each of the display pixels (DPX), each display pixel (DPX) (or the corresponding unit mapping area UMA) and imaging data CID can be remapped (e.g., remapped or finely aligned) according to the set offset value. For example, the brightness value L(x, y) of the imaging data CID can be realigned for each unit mapping area UMA by moving the brightness value L(x, y) of the imaging data CID according to each offset value.

[0144] ST70: Calculate representative brightness values

[0145] Once the secondary mapping is complete, a representative luminance value (RLV) for each of the display pixels (DPX) can be calculated. For example, the representative luminance value (RLV) for each display pixel (DPX) can be calculated by summing or weighting the luminance values ​​(L(x, y) that are realigned in the unit mapping region (UMA) corresponding to each display pixel (DPX).

[0146] ST80: Set brightness correction value

[0147] After calculating the representative luminance value RLV of the display pixel DPX, a luminance correction value LCV corresponding to each representative luminance value RLV can be set for the display pixel DPX. For example, luminance deviation can be detected by comparing the representative luminance value RLV with a reference value (e.g., a predetermined reference value) for each display pixel DPX, and a luminance correction value LCV can be set to compensate for the luminance deviation.

[0148] ST90: Stores brightness correction value

[0149] After setting the brightness correction value LCV of the display pixel DPX, the brightness correction value LCV can be stored in the memory 150 of the display device 100.

[0150] When actually driven, the display device 100 can generate compensated image data CGD by converting input image data according to the brightness correction value LCV stored in the memory 150. Furthermore, the display device 100 can generate a data signal in response to the compensated image data CGD, and can drive the display pixel DPX in response to the data signal. Therefore, the brightness of the display pixel DPX can be corrected.

[0151] For example, according to embodiments of this disclosure, by preprocessing the imaging data CID for optical compensation of the display device 100 based on the luminance characteristics of each of the display pixels DPX, the optical compensation value (e.g., luminance correction value LCV) of each display pixel DPX can be set more precisely. For example, in embodiments of this disclosure, for each display pixel DPX (or corresponding unit mapping area UMA), a secondary mapping can be performed to more precisely map (or align) the luminance values ​​L(x, y) of the image pixels initially mapped by reflecting the luminance characteristics (e.g., luminance distribution characteristics) of the display pixel DPX. Therefore, a luminance correction value LCV reflecting the luminance distribution characteristics of each display pixel DPX can be set.

[0152] Therefore, the brightness distribution characteristics are different for each potentially different display device 100 in the display pixels DPX (e.g., such as...). Figure 3 and Figure 4 In the embodiment described above, where multiple light-emitting elements (LDs) are non-uniformly distributed in the emission region of each display pixel (DPX) in the display device 100, the performance of optical compensation for spot compensation in the display device 100 can be improved. Therefore, spot compensation in the display device 100 can be effectively achieved, and image quality can be improved.

[0153] According to the method and apparatus for compensating the brightness of a display device according to embodiments of the present disclosure, the brightness correction value can be set more precisely based on the brightness characteristics of each display pixel. Therefore, spotting on the display device can be effectively compensated, and image quality can be improved.

[0154] Some aspects of the implementation are not limited to the above content, and various other effects are included in this disclosure.

[0155] Although this disclosure has been described in detail with reference to the above embodiments, it should be noted that the above embodiments are for illustrative purposes only and are not intended to limit this disclosure. Furthermore, those skilled in the art will understand that various modifications are possible within the scope of the technical spirit of this disclosure.

[0156] The scope of this disclosure is not limited to the detailed description herein, but should be defined by the appended claims. Furthermore, all changes or modifications to this disclosure derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of this disclosure.

Claims

1. A method for compensating the brightness of a display device, the method comprising: Capture the image of the display device; Generate imaging data; The display pixels of the display device and the imaging data are initially mapped such that the unit mapping area corresponding to the display pixel includes the brightness value of the image pixel of the imaging device; An offset value for the imaging data is set for the display pixel, such that the maximum brightness value among the brightness values ​​is located at the center of the unit mapping area; The imaging data is remapped based on the offset value for the display pixel; Calculate representative brightness values; as well as For one of the display pixels, a brightness correction value corresponding to the representative brightness value is set. The secondary mapping of the imaging data based on the offset value for the display pixel includes realigning the brightness value of the imaging data for the unit mapping area by moving the brightness value of the imaging data according to the offset value, and Calculating the representative brightness value includes calculating the sum or weighted sum of the brightness values ​​that are realigned in the cell mapping region.

2. The method according to claim 1, wherein, Capturing the image from the display device includes: Drive the display device to display the test image as the image; and The imaging device is positioned in front of the display device such that the image pixels are aligned with the display pixels.

3. The method according to claim 1, wherein, Generating the imaging data includes: The brightness value is detected using the image pixels; and Align the brightness value according to the position code corresponding to the image pixel.

4. The method according to claim 1, wherein, The display pixels and the imaging data are initially mapped based on the position codes of the image pixels aligned with the display pixels.

5. The method according to claim 1, wherein, Setting the offset value of the imaging data includes: For the brightness value of the horizontal line located at the center of the horizontal direction in the unit mapping area, detect the maximum brightness value and horizontal position in the horizontal direction; A horizontal offset value is set for the horizontal direction so that the maximum brightness value in the horizontal direction is located at the center of the horizontal line; For the brightness value of a vertical line located at the center of the vertical direction in the unit mapping area, detect the maximum brightness value and vertical position in the vertical direction; and A vertical offset value is set for the vertical direction so that the maximum brightness value in the vertical direction is located at the center of the vertical line.

6. The method according to claim 1, wherein, Setting the offset value of the imaging data includes: For the brightness values ​​arranged in the unit mapping area, detect the maximum brightness value and its position; and Set the offset value for moving the brightness value of the imaging data such that the maximum brightness value is located at the center of the unit mapping area.

7. The method according to claim 1, wherein, Setting the brightness correction value includes: Brightness deviation is detected by comparing the representative brightness value with a reference value; and The brightness correction value is set to compensate for the brightness deviation.

8. The method according to claim 1, further comprising: The brightness correction value is stored in the memory of the display device; as well as Compensated image data is generated by converting the input image data according to the brightness correction value.

9. The method according to claim 8, further comprising: Generate a data signal corresponding to the compensated image data; as well as The display pixels are driven in response to the data signal.

Images