System for evaluating display device and method for evaluating display device using the same

Abstract

The system for evaluating a display device includes: a display device including a display panel that outputs a pattern image for a viewpoint and a lens array that refracts the pattern image; and a luminance meter that generates a luminance profile by capturing the pattern image. Each of the pattern images includes a pattern.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to and the benefit of Korean Patent Application No. 10-2023-0119681 filed in the Korean Intellectual Property Office (KIPO) on September 8, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present disclosure relates to a system for evaluating a display device and a method of evaluating a display device using the system. Background Art

[0004] As information technology develops, the importance of display devices as a connection medium between users and information is becoming prominent. In response to this, the use of display devices such as liquid crystal display devices and organic light emitting display devices is increasing.

[0005] A stereoscopic image display device is a display device that stimulates the visual senses of an observer like a real object and provides physical factors to perceive an image in three dimensions. For example, a stereoscopic image display device can provide different images to the left and right eyes of an observer, so that the observer can observe a stereoscopic image due to binocular parallax between the left and right eyes.

[0006] Recently, research on an autostereoscopic method without wearing stereo glasses has been actively conducted. The autostereoscopic method may include a lenticular method that separates a left-eye image and a right-eye image using a cylindrical lens array, a barrier method that separates a left-eye image and a right-eye image using a barrier, and the like.

[0007] An autostereoscopic display device may form a light field composed of multiple viewpoints. In this case, crosstalk may be generated in which each viewpoint partially overlaps with an adjacent viewpoint. In addition, if an observer does not observe an image on the display device at an optimal viewing distance, distortion may be generated in the stereoscopic image.

[0008] The above description is only used to help understand the background technology of the technical concept of the present disclosure. Therefore, it should not be understood as the content corresponding to the prior art known to those skilled in the art in the field to which the present disclosure belongs. Summary of the invention

[0009] The technical problem to be solved by the present disclosure is to provide a system for evaluating a display device and a method for evaluating a display device using the system, which shortens the time for evaluating a display device that outputs images corresponding to a plurality of viewpoints.

[0010] According to an embodiment of the present disclosure, a system for evaluating a display device may include: a display device including a display panel outputting pattern images for viewpoints and a lens array refracting the pattern images; and a luminance meter generating a luminance profile by capturing the pattern images. Each of the pattern images may include a pattern.

[0011] The pattern image may include patterns at different locations.

[0012] The pattern image may include a first pattern image including a first pattern and a second pattern image including a second pattern, the first pattern may overlap with a virtual reference pattern defined in the pattern image, and the second pattern may be spaced apart from the virtual reference pattern by a first distance in one direction.

[0013] The pattern image may further include a third pattern image including a third pattern, and the third pattern may be spaced apart from the virtual reference pattern in the direction by a second distance greater than the first distance.

[0014] The pattern may have a line shape.

[0015] The luminance meter may include a main controller that measures crosstalk generated by the display panel based on the luminance profile.

[0016] The main controller may extract a brightness profile graph corresponding to the brightness profile, and measure the crosstalk based on a ratio of one area in the brightness profile graph to another area other than the area.

[0017] The area may include a point with maximum brightness in the brightness contour curve graph, and the crosstalk may decrease as the area increases.

[0018] The main controller may measure a degree of distortion in a pattern image output by the display panel based on the brightness profile.

[0019] The main controller may extract a brightness profile graph corresponding to the brightness profile, and measure the degree of distortion based on a distance between a point having the largest brightness in one of the brightness profile graphs and a point having the largest brightness in another adjacent one of the brightness profile graphs.

[0020] The degree of distortion can increase with distance.

[0021] The system for evaluating a display device may further include: a moving member to move the luminance meter from the display panel.

[0022] According to an embodiment of the present disclosure, a method for evaluating a display device may include: outputting pattern images for viewpoints through a display panel; generating measurement images by capturing the pattern images refracted by a lens array disposed on the display panel; and generating a brightness profile based on the measurement images. Each of the pattern images may include a pattern.

[0023] The pattern image may include patterns at different locations.

[0024] The pattern image may include a first pattern image including a first pattern and a second pattern image including a second pattern, the first pattern may overlap with a virtual reference pattern defined in the pattern image, and the second pattern may be spaced apart from the virtual reference pattern by a first distance in one direction.

[0025] The pattern image may further include a third pattern image including a third pattern, and the third pattern may be spaced apart from the virtual reference pattern in the direction by a second distance greater than the first distance.

[0026] The method for evaluating a display device may further include measuring a crosstalk generated by the display panel based on the luminance profile.

[0027] Measuring the crosstalk may include: extracting a brightness profile graph corresponding to the brightness profile; and measuring the crosstalk based on a ratio of one area in the brightness profile graph to another area other than the area.

[0028] The method for evaluating a display device may further include measuring a degree of distortion in a pattern image output by the display panel based on the brightness profile.

[0029] Measuring the degree of distortion in the pattern image may include: extracting a brightness profile graph corresponding to the brightness profile; and measuring the degree of distortion based on a distance between a point with the maximum brightness in one of the brightness profile graphs and a point with the maximum brightness in another adjacent brightness profile graph. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the disclosure and together with the description serve to explain the principles of the disclosure.

[0031] Figure 1 is a schematic diagram for explaining a lens array type stereoscopic image display device.

[0032] Figure 2 is a schematic diagram for explaining the relationship between the lens array and the display panel.

[0033] Figure 3 is a schematic diagram for explaining the relationship between a luminance meter and a display device according to an embodiment of the present disclosure.

[0034] Figure 4 It is shown Figure 3 A schematic block diagram of an embodiment of a brightness meter.

[0035] FIG. 5A to FIG. 5E It is shown from Figure 3 Schematic diagram of a pattern image output by a display device.

[0036] Figure 6 It is shown by Figure 3 Schematic diagram of a measurement image at the kth viewpoint generated by a luminance meter by capturing a pattern image.

[0037] Figure 7 It is shown Figure 6 A graph of the brightness profile of the measured image.

[0038] Figure 8 It is shown Figure 3 Schematic diagram of a state in which the brightness meter has been moved from the display panel.

[0039] Fig. 9 is a flowchart illustrating a method for evaluating a display device according to an embodiment of the present disclosure.

[0040] Fig.10 is a flowchart illustrating a method for evaluating a display device according to another embodiment of the present disclosure.

[0041] Fig.11 is a flowchart illustrating a method for evaluating a display device according to yet another embodiment of the present disclosure. DETAILED DESCRIPTION

[0042] Hereinafter, embodiments according to the present disclosure are described in detail with reference to the accompanying drawings. It should be noted that in the following description, only the parts necessary for understanding the operation according to the present disclosure are described, and the description of other parts is omitted so as not to obscure the subject matter of the present disclosure. In addition, the present disclosure may be implemented in other forms, without being limited to the embodiments described herein. However, a sufficiently detailed description of the embodiments described herein is provided so that a technician in the technical field to which the present disclosure belongs can easily realize the technical spirit of the present disclosure.

[0043] When an element, such as a layer, is referred to as being "on," "connected to," or "coupled to" another element or layer, it may be directly on, directly connected to, or directly coupled to the other element or layer, or there may be intervening elements or layers. However, when an element or layer is referred to as being "directly on," "directly connected to," or "directly coupled to" another element or layer, there are no intervening elements or layers. For this purpose, the term "connected" may refer to a physical connection, an electrical connection, and / or a fluid connection with or without intervening elements.

[0044] The terms used herein are used to describe specific embodiments, and are not intended to limit the present disclosure. The terms used herein are used to describe the purpose of specific embodiments, and are not intended to limit. As used herein, the singular forms "one", "an" and "the" are intended to also include plural forms, unless the context clearly indicates otherwise. In addition, when used in this specification, the terms "include", "include", "include" and / or "include" specify the existence of the features, integral bodies, steps, operations, elements, parts and / or its groups, but do not exclude the existence or addition of one or more other features, integral bodies, steps, operations, elements, parts and / or its groups. It should also be noted that, as used herein, the terms "substantially", "about" and other similar terms are used as approximate terms and not as degree terms, and therefore, are used to explain the inherent deviations in the values ​​measured, calculated and / or provided that will be recognized by those of ordinary skill in the art.

[0045] In the specification and claims, for the purpose of its meaning and interpretation, the phrase "at least one of..." is intended to include the meaning of "at least one selected from the group of...". For example, "at least one of A and B" may be understood to mean "A, B, or A and B". In the specification and claims, for the purpose of its meaning and interpretation, the term "and / or" is intended to include any combination of the terms "and" and "or". For example, "A and / or B" may be understood to mean "A, B, or A and B". The terms "and" and "or" may be used in a conjunctive or disjunctive sense and may be understood to be equivalent to "and / or".

[0046] Although the terms "first", "second", etc. may be used herein to describe various types of elements, these elements should not be limited by these terms. These terms are used to distinguish one element from another element. Therefore, without departing from the teachings of the present disclosure, the first element discussed below may be referred to as the second element.

[0047] For descriptive purposes, spatially relative terms such as "below," "below," "under," "down," "above," "up," "above," "higher," "side" (e.g., as in "sidewall"), etc. may be used herein and thereby describe the relationship of one element to another element(s) as shown in the accompanying drawings. In addition to the orientation depicted in the accompanying drawings, spatially relative terms are intended to encompass different orientations of the device in use, operation, and / or manufacture. For example, if the device in the accompanying drawings is flipped, an element described as being "below" or "below" other elements or features will then be oriented "above" the other elements or features. Thus, the exemplary term "below" may encompass both above and below orientations. Additionally, the device may be oriented in other ways (e.g., rotated 90 degrees or in other orientations), and therefore, the spatially relative descriptors used herein are interpreted accordingly.

[0048] Various embodiments are described with reference to the accompanying drawings that schematically illustrate ideal embodiments. Therefore, it is expected that the shapes may vary depending on, for example, tolerances and / or manufacturing techniques. Therefore, the embodiments disclosed herein should not be construed as limited to the specific shapes shown, and should be construed to include changes in shape that may occur, for example, due to manufacturing. As described above, the shapes shown in the accompanying drawings may not illustrate the actual shape of an area of ​​the device, and the present disclosure is not limited thereto.

[0049] Unless otherwise defined or indicated herein, all terms (including technical and scientific terms) used have the same meaning as commonly understood by those skilled in the art to which the present disclosure belongs. It will also be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and should not be interpreted in an idealized or overly formal sense unless clearly defined in the specification.

[0050] Figure 1 is a schematic diagram for explaining a lens array type stereoscopic image display device.

[0051] refer to Figure 1 , the display device 100 may include a display panel DP and a lens array LSA.

[0052] The display panel DP may include sub-pixels SPX that emit light to display an image. In an embodiment, each of the sub-pixels SPX may output one of light of a first color (e.g., red), light of a second color (e.g., green), and light of a third color (e.g., blue). However, the color of the light emitted from the sub-pixel SPX is not limited thereto. Light of various colors for achieving full color may be output. The display panel DP may include an organic light emitting display panel, a liquid crystal display panel, a quantum dot display panel, etc.

[0053] The lens array LSA may be disposed on the display panel DP and may include lenses LS that refract light incident from the sub-pixels SPX. For example, the lens array LSA may be implemented as a lenticular lens array, a micro lens array, or the like.

[0054] A light field display may be a 3D display device that realizes a stereoscopic image by forming a light field represented as a vector distribution (intensity, direction) of light in space using a flat panel display and an optical element (e.g., a lens array LSA). A light field display may realize a more natural stereoscopic image because an observer can see the depth and sides of an object, and a light field display may be a display technology that is expected to be used in various ways through integration with AR (augmented reality) technology, etc.

[0055] Light fields can be implemented in several ways. For example, light fields can be formed by using a method of creating a multi-directional light field using multiple projectors, a method of controlling the direction of light using a diffraction grating, a method of using two or more panels to adjust the direction and intensity (brightness) of light according to the combination of each pixel, a method of controlling the direction of light using a pinhole or barrier, a method of controlling the direction of light refraction through a lens array, etc.

[0056] In an embodiment, if Figure 1 As shown in , the lens array type stereoscopic image display device 100 can display a stereoscopic image (3D image) by forming a light field.

[0057] A series of sub-pixels SPX may be assigned to each lens LS. Light emitted from each of the sub-pixels SPX may be refracted by the lens LS and travel only in a specific direction to form a light field represented by light intensity and direction. When an observer views the display device 100 in the light field formed as described above, the observer may feel a three-dimensional effect of the corresponding image.

[0058] Image information according to the viewpoint of an observer in the light field may be defined and processed in units of voxels. A voxel may be graphic information defining a point (or pixel) in 3D space.

[0059] The resolution of a 2D image may be determined by the number (e.g., density) of pixels in the same area. For example, the resolution may increase if the number of pixels in the same area increases. For example, a high-resolution image may require a display panel DP with a high pixel density. Similarly, the resolution of a stereoscopic image may increase if the number of voxels at the same viewpoint through the lens array LSA increases.

[0060] The display panel DP can be applied to electronic devices such as smart phones, TVs, tablet PCs, mobile phones, video phones, e-book readers, desktop PCs, laptop PCs, netbook computers, workstations, servers, PDAs, portable multimedia players (PMPs), MP3 players, medical devices, cameras, or wearable devices.

[0061] According to an embodiment, the display panel DP may also be applied to a head mounted display device. The device to which the display panel DP is applied is not limited to the above examples, and the display panel DP may be applied to an electronic device having a display screen on at least one side.

[0062] Figure 2 is a schematic diagram for explaining the relationship between the lens array and the display panel.

[0063] refer to Figure 2, the display panel DP may include sub-pixels SPX arranged in a first direction DR1 and a second direction DR2 intersecting the first direction DR1. The sub-pixels SPX may include light emitting surfaces in a third direction DR3 intersecting the first direction DR1 and the second direction DR2.

[0064] Each of the sub-pixels SPX may include a light emitting element configured to emit light. The light emitting element may be provided in various forms. For example, the light emitting element may be an inorganic light emitting element including an inorganic material. According to an embodiment, the light emitting element may be an organic light emitting diode (OLED).

[0065] Each of the sub-pixels SPX may be a first pixel configured to emit red light, a second pixel configured to emit green light, or a third pixel configured to emit blue light.

[0066] The lens array LSA may include lenses LS1, LS2, ..., and LSm, where m may be a natural number greater than 1. The lenses LS1 to LSm may be biconvex lenses.

[0067] The lenses LS1 to LSm may overlap the sub-pixel SPX in the third direction DR3. The lenses LS1 to LSm may be arranged so that their long sides have an angle ag1 greater than 0 degrees relative to the second direction DR2. For example, the first lens LS1 may include a first long side LS1s1 and a second long side LS1s2 that are parallel to each other. In addition, the second lens LS2 may include a first long side LS2s1 and a second long side LS2s2 that are parallel to each other. The lenses LS1 to LSm may be arranged in the first direction DR1. However, the present disclosure is not limited thereto, and in another embodiment, the angle ag1 may be 0 degrees.

[0068] The lower surface (surface facing the sub-pixel SPX) of each of the lenses LS1 to LSm may be divided into a plurality of viewpoint areas V1 to V39. The viewpoint areas V1 to V39 may not be physically divided but may be virtual areas and may be defined in various ways according to the resolution of the display panel DP, the specifications of the lenses LS1 to LSm, the number of viewpoints to be provided to the user, etc. Each of the lenses LS1 to LSm may cause images corresponding to each of the viewpoint areas V1 to V39 to be distributed in different directions (different viewpoints), so that the user can visually recognize a multi-view image in which the image changes according to the position.

[0069] The sub-pixel SPX may overlap one or more of the viewpoint areas V1 to V39 in the third direction DR3 . Figure 2 The main viewpoint areas V1 to V39 corresponding to the sub-pixels SPX are shown. The sub-pixels SPX corresponding to the same viewpoint area can display the same viewpoint VW (see Figure 3). Therefore, Figure 2 As shown in , in the case where there are 39 viewpoint areas V1 to V39, the display panel DP can display 39 images at the same time.

[0070] According to an embodiment, the display device 100 can display a stereoscopic image by displaying a right eye image using a sub-pixel SPX overlapping with the viewpoint areas V1 to V20 in the third direction DR3 and displaying a left eye image using a sub-pixel SPX overlapping with the viewpoint areas V21 to V39 in the third direction DR3. A user of the display device 100 can be positioned so that the left eye image is visually recognized by the left eye and the right eye image is visually recognized by the right eye.

[0071] Sub-pixels SPX can be in the form of RGB stripes, Diamond S-strip, Real RGB, Normal Various structural arrangements such as the following:

[0072] Figure 3 is a schematic diagram for explaining the relationship between a luminance meter and a display device according to an embodiment of the present disclosure. Figure 4 It is shown Figure 3 A schematic block diagram of an embodiment of a brightness meter. FIG. 5A to FIG. 5E It is shown from Figure 3 Schematic diagram of a pattern image output by a display device.

[0073] refer to Figure 3 , a system 1000 for evaluating a display device according to an embodiment of the present disclosure may include a display device 100 , a luminance meter 200 , and a moving member 300 .

[0074] Reference together FIG. 5A to FIG. 5E , the display device 100 may output pattern images PI1, PI2, ..., PIk, ..., and PIn for the viewpoint VW. For example, the pattern images PI1, PI2, ..., PIk, ..., and PIn may correspond to the viewpoints VW1 to VWn, respectively, where k and n may be natural numbers greater than 1 and n>k. Therefore, the first pattern image PI1 may be an image corresponding to the first viewpoint VW1, the kth pattern image PIk may be an image corresponding to the kth viewpoint VWk, and the nth pattern image PIn may be an image corresponding to the nth viewpoint VWn. Therefore, the display device 100 may display a multi-view image by outputting pattern images PI1, PI2, ..., PIk, ..., and PIn.

[0075] Display panel DP (see Figure 2) may include a sub-pixel group for displaying each of the first pattern image PI1 to the nth pattern image PIn. Among the sub-pixels SPX of the display panel DP, the sub-pixels SPX in the third direction DR3 are aligned with the first viewpoint area V1 (see Figure 2 ) can be a first sub-pixel group, and the first sub-pixel group can output the first pattern image PI1. In addition, in the sub-pixel SPX, the sub-pixel SPX overlaps with the 39th viewpoint area V39 (see Figure 2 ) The overlapping sub-pixel SPX may be a 39th sub-pixel group, and the 39th sub-pixel group may output a 39th pattern image PI39. According to an embodiment, n may be 39, and the display device 100 may include at least 39 sub-pixel groups.

[0076] The first pattern image PI1 to the nth pattern image PIn may include patterns PT1 to PTn arranged at different positions. For example, the first pattern image PI1 may include a first pattern PT1 overlapping a virtual reference line SL set at the top of the image in the third direction DR3. The second pattern image PI2 may include a second pattern PT2 spaced apart from the reference line SL by a first distance WT1. In addition, the third pattern image PI3 may include a third pattern PT3 spaced apart from the reference line SL by a second distance WT2. In this way, the patterns PT1 to PTn may be arranged to be gradually spaced apart from the reference line SL from the first pattern PT1 to the nth pattern PTn.

[0077] According to an embodiment, the patterns PT1 to PTn may have a line shape. However, the present disclosure is not limited thereto as long as the pattern images PI1 to PIn can be distinguished.

[0078] refer to Figure 4 , the luminance meter 200 may include a camera 210 that captures a multi-view image displayed by the display device 100. For example, the camera 210 may capture first to n-th pattern images PI1 to PIn output by the display device 100 and corresponding to first to n-th viewpoints VW1 to VWn.

[0079] According to an embodiment, the camera 210 may be a spectroradiometer or a multispectral camera, but the present disclosure is not limited thereto as long as the camera 210 can measure the brightness of the multi-view image displayed by the display device 100 .

[0080] The luminance meter 200 may include an image processor 220 that generates a measurement image MI. For example, the image processor 220 may receive image data ID captured by the camera 210. The image processor 220 may generate the measurement image MI based on the image data ID. For example, the image processor 220 may generate measurement images MI1 to MINn corresponding to viewpoints VW1 to VWn.

[0081] The luminance meter 200 may include a main controller 230 that generates a luminance profile. The main controller 230 may receive a measurement image MI. The main controller 230 may generate a luminance profile based on the received measurement image MI.

[0082] The moving member 300 may move the position of the luminance meter 200. For example, the luminance meter 200 may be connected to the moving member 300 and move in the third direction DR3. Therefore, the distance between the display device 100 and the luminance meter 200 may vary.

[0083] Figure 6 It is shown by Figure 3 Schematic diagram of a measurement image at the kth viewpoint generated by a luminance meter by capturing a pattern image. Figure 7 It is shown Figure 6 A graph of the brightness profile of the measured image.

[0084] refer to Figure 6 The brightness meter 200 can capture the pattern images PI1 to PIn output by the display device 100 (see FIG. 5A to FIG. 5E ) to generate the measurement image MI. For example, the luminance meter 200 may capture a k-th viewpoint VWk image represented by the pattern images PI1 to PIn. Therefore, a k-th measurement image MI_k substantially the same as an image observed by a user of the display device 100 at the k-th viewpoint VWk may be generated.

[0085] The measurement image MI may include a pattern group PTG. For example, the kth measurement image MI_k may include a kth pattern group PTG_k including a (k-1)th pattern PTk-1, a kth pattern PTk, and a (k+1)th pattern PTk+1. However, the present disclosure is not limited thereto, and the kth pattern group PTG_k may include more patterns.

[0086] In an embodiment, the kth pattern group PTG_k may include only the kth pattern PTk. In another embodiment, the kth pattern group PTG_k may include not only the kth pattern PTk but also the (k-1)th pattern PTk-1 and / or the (k+1)th pattern PTk+1. For example, in a case where a user of the display device 100 observes an image corresponding to the kth viewpoint VWk, not only the light of the kth pattern image PIk but also the light of the (k-1)th pattern image PIk-1 and the (k+1)th pattern image PIk+1 may overlap with each other. Therefore, crosstalk may be generated in which not only the kth pattern PTk but also the (k-1)th pattern PTk-1 and / or the (k+1)th pattern PTk+1 are visually recognized by the user. Therefore, the crosstalk generated by the display device 100 may affect the visibility of the display device 100, and thus it may be desirable to accurately measure the crosstalk.

[0087] The pattern group PTG may have an inclined shape. For example, the pattern group PTG may have a shape inclined at a certain angle to the horizontal direction.

[0088] The k-th pattern group PTG_k may extend parallel to the horizontal direction, but the present disclosure is not limited thereto, and the k-th pattern group PTG_k may be inclined at a certain angle to the horizontal direction. For example, in the multi-view image displayed by the display device 100, there may be an optimal viewing distance corresponding to each viewpoint VW. In the case where the distance between the user and the display device 100 is different from the optimal viewing distance of the image corresponding to the k-th viewpoint VWk, distortion may be generated in the image, and the visibility of the display device 100 may be reduced. Therefore, it is desirable to measure the degree of distortion in the multi-view image output by the display device 100.

[0089] Reference together Figure 7 , main controller 230 (see Figure 4 ) can generate a brightness profile of the measurement image MI. For example, the main controller 230 can generate a brightness profile by analyzing the brightness distribution of the kth measurement image MI_k.

[0090] The main controller 230 may extract a brightness profile graph PF corresponding to the brightness profile. Figure 6 The first, second and third brightness profile graphs PF_P1, PF_P2 and PF_P3 are extracted based on the brightness distribution in the vertical direction of each of the first to third parts P1 to P3. Hereinafter, for the convenience of description, the description will focus on the second brightness profile graph PF_P2.

[0091] The second brightness profile graph PF_P2 may be a graph extracted by analyzing the brightness distribution of the second portion P2 of the k-th measurement image MI_k. The second brightness profile graph PF_P2 may include a first area A1 and a second area A2.

[0092] The first area A1 may be an area corresponding to an image that is intended to be observed by the user at the k-th viewpoint VWk. For example, the first area A1 may be an area corresponding to the brightness distribution of the k-th pattern PTk in the second part P2.

[0093] The second area A2 may be an area corresponding to an image that is not intended to be observed by the user at the kth viewpoint VWk. For example, the second area A2 may be an area corresponding to the brightness distribution of the (k-1)th pattern PTk-1 and / or the (k+1)th pattern PTk+1 in the second part P2.

[0094] The main controller 230 may measure the crosstalk based on the ratio of the first area A1 to the second area A2. For example, the main controller 230 may calculate the area of ​​the first area A1 and the second area A2 of the second brightness profile graph PF_P2. The main controller 230 may extract a value obtained by dividing the area of ​​the second area A2 by the area of ​​the first area A1, and measure the crosstalk generated by the display device 100 based on the value. In an embodiment, the crosstalk may decrease as the second area increases. However, this is only an example, and the present disclosure is not limited thereto, as long as the crosstalk can be quantified.

[0095] The main controller 230 may measure the degree of distortion based on the first brightness profile graph PF_P1 adjacent to the second brightness profile graph PF_P2. For example, the third line L3 may be a virtual line overlapping the point with the maximum brightness in the third brightness profile graph PF_P3. For example, the second line L2 may be a virtual line overlapping the point with the maximum brightness in the second brightness profile graph PF_P2. The first line L1 may be a virtual line overlapping the point with the maximum brightness in the first brightness profile graph PF_P1. The main controller 230 may extract the horizontal distance WT_D between the second line L2 and the first line L1. Therefore, the main controller 230 may measure the degree of distortion in the image output by the display device 100 based on the extracted horizontal distance WT_D. In an embodiment, the degree of distortion may increase as the horizontal distance WT_D increases. However, this is merely an example, and the present disclosure is not limited thereto, as long as the degree of distortion can be quantified.

[0096] According to an embodiment of the present disclosure, it is possible to shorten the time for measuring the degree of crosstalk and distortion of a multi-view image output by the display device 100. For example, the luminance meter 200 can generate a measurement image MI corresponding to each of the viewpoints VW by a single capture. Therefore, the luminance meter 200 can generate a luminance profile based on the measurement image MI by a single capture, and it is possible to shorten the time for measuring the degree of crosstalk and distortion of an image output by the display device 100.

[0097] Figure 8 It is shown Figure 3 Schematic diagram of a state in which the brightness meter has been moved from the display panel.

[0098] refer to Figure 8 , the luminance meter 200 may be moved from the display device 100 by the moving member 300. For example, the luminance meter 200 may be moved in the third direction DR3 and / or in a direction opposite to the third direction DR3.

[0099] According to an embodiment of the present disclosure, the system 1000 for evaluating a display device can measure the degree of crosstalk and distortion while changing the distance between the brightness meter 200 and the display device 100 (for example, the distance in the third direction DR3). For example, the moving member 300 can move the brightness meter 200 in the third direction DR3 or in the direction opposite to the third direction DR3. The brightness meter 200 can generate a brightness profile of a multi-view image displayed by the display device 100 in a state close to or away from the display device 100. Therefore, the brightness meter 200 can measure the degree of crosstalk and distortion generated by the display device 100 according to the distance from the display device 100.

[0100] Fig. 9 is a flowchart illustrating a method for evaluating a display device according to an embodiment of the present disclosure. Fig.10 is a flowchart illustrating a method for evaluating a display device according to another embodiment of the present disclosure. Fig.11 is a flowchart illustrating a method for evaluating a display device according to yet another embodiment of the present disclosure.

[0101] refer to Fig. 9 According to an embodiment, a method for evaluating a display device may include: outputting a pattern image for a viewpoint through a display panel (S910); generating a measurement image by capturing the pattern image refracted by a lens array disposed on the display panel (S920); and generating a brightness profile based on the measurement image (S930).

[0102] refer to FIG. 5A to FIG. 5E and Fig. 9 In step S910, the display panel DP (see Figure 2 ) can be output for viewpoint VW (see Figure 3 For example, a plurality of sub-pixel groups of the display panel DP may output first to n-th pattern images PI1 to PIn based on the pattern signal.

[0103] The pattern image PI may correspond to different viewpoints VW. For example, the first to nth pattern images PI1 to PIn may correspond to the first to nth viewpoints VW1 to VWn, respectively.

[0104] refer to Figure 3 , Figure 6 and Fig. 9 In step S920, the measurement image MI may be generated by capturing the pattern image PI. For example, a kth measurement image MI_k may be generated based on the captured first to nth pattern images PIn. The kth measurement image MI_k may correspond to an image that can be observed by a user of the display device 100 from the kth viewpoint VWk.

[0105] At this step, the display device 100 (see Figure 8 ) and brightness meter 200 (see Figure 8 ) may vary. For example, after the luminance meter 200 is moved by the moving member 300, the pattern image PI may be captured. Therefore, the measurement image MI corresponding to the pattern image PI captured at different positions may be generated.

[0106] refer to Figure 7 and Fig. 9 In step S930, a brightness profile may be generated based on the measurement image MI. For example, a brightness profile may be generated based on the kth measurement image MI_k.

[0107] At this step, the brightness profile graphs PF of the plurality of parts of the measurement image MI may be extracted. For example, the brightness profile graphs PF_P1, PF_P2 and PF_P3 may be extracted by analyzing the brightness distribution of the first part P1 to the third part P3 of the kth measurement image MI_k in the vertical direction.

[0108] refer to Fig.10 According to an embodiment, a method for evaluating a display device may include: outputting a pattern image for a viewpoint through a display panel (S1010); generating a measurement image by capturing the pattern image refracted by a lens array disposed on the display panel (S1020); generating a brightness profile based on the measurement image (S1030); and measuring crosstalk generated by the display panel based on the brightness profile (S1040).

[0109] Fig.10 Steps S1010, S1020 and S1030 may be similar to Fig. 9Hereinafter, repeated description will be omitted.

[0110] refer to Figure 7 and Fig.10 In step S1040, the crosstalk generated by the display panel DP may be measured based on the brightness profile. For example, a second brightness profile graph PF_P2 including the first area A1 and the second area A2 may be extracted. Thereafter, the crosstalk may be measured based on a value obtained by dividing the area of ​​the second area A2 by the area of ​​the first area A1.

[0111] refer to Fig.11 According to an embodiment, a method for evaluating a display device may include: outputting a pattern image for a viewpoint through a display panel (S1110); generating a measurement image by capturing the pattern image refracted by a lens array disposed on the display panel (S1120); generating a brightness profile based on the measurement image (S1130); and measuring a degree of distortion in the pattern image output by the display panel based on the brightness profile (S1140).

[0112] Fig.11 Steps S1110, S1120 and S1130 may be similar to Fig. 9 Hereinafter, repeated description will be omitted.

[0113] refer to Figure 7 and Fig.11 In step S1140, the degree of distortion in the pattern image PI output by the display panel DP may be measured based on the brightness profile. For example, a first brightness profile graph PF_P1 and a second brightness profile graph PF_P2 may be extracted. Thereafter, a horizontal distance WT_D between a point where the first line L1 overlaps with the first brightness profile graph PF_P1 and has the maximum brightness and another point where the second line L2 overlaps with the second brightness profile graph PF_P2 and has the maximum brightness may be extracted. Based on this, the degree of distortion in the stereoscopic image output by the display panel DP may be measured.

[0114] According to the system and method for evaluating a display device of the present disclosure, it is possible to shorten the time for evaluating a display device that outputs images corresponding to a plurality of viewpoints.

[0115] The above description is an example of the technical features of the present disclosure, and a person skilled in the art will be able to make various modifications and changes.Therefore, the embodiments of the present disclosure described above can be implemented individually or in combination with each other.

[0116] Therefore, the embodiments disclosed in the present disclosure are not intended to limit the technical spirit of the present disclosure, but are intended to describe the technical spirit of the present disclosure, and the scope of the technical spirit of the present disclosure is not limited by these embodiments. The protection scope of the present disclosure should be interpreted by the attached claims, and it should be understood that all technical spirits within the equivalent scope are included in the scope of the present disclosure.

Claims

1. A system for evaluating a display device, comprising: A display device including a display panel outputting a pattern image for a viewpoint and a lens array refracting the pattern image; as well as a brightness meter, generating a brightness profile by capturing the pattern image, Wherein, each of the pattern images includes a pattern.

2. The system according to claim 1, wherein: The pattern image includes the pattern at different positions.

3. The system according to claim 2, wherein: The pattern image includes a first pattern image including a first pattern and a second pattern image including a second pattern, The first pattern overlaps with a virtual reference pattern defined in the pattern image, and The second pattern is spaced apart from the virtual reference pattern by a first distance in one direction.

4. The system according to claim 3, wherein: The pattern image further includes a third pattern image including a third pattern, and The third pattern is spaced apart from the virtual reference pattern in the direction by a second distance greater than the first distance.

5. The system according to claim 1, wherein: The pattern has a line shape.

6. The system according to claim 1, wherein: The luminance meter includes a main controller that measures a crosstalk generated by the display panel based on the luminance profile.

7. The system according to claim 6, wherein: The main controller extracts a brightness profile graph corresponding to the brightness profile, and measures the crosstalk based on a ratio of one region to another region other than the one region in the brightness profile graph.

8. The system according to claim 7, wherein: The one area includes the point with the maximum brightness in the brightness profile curve graph, and The crosstalk decreases as the one area increases.

9. The system according to claim 6, wherein: The main controller measures a degree of distortion in the pattern image output by the display panel based on the brightness profile.

10. The system according to claim 9, wherein: The main controller extracts a brightness profile graph corresponding to the brightness profile, and measures the degree of distortion based on a distance between a point with the largest brightness in one of the brightness profile graphs and a point with the largest brightness in another adjacent one of the brightness profile graphs.

11. The system according to claim 10, wherein: The degree of distortion increases as the distance increases.

12. The system of claim 1, further comprising: A moving member moves the luminance meter from the display panel.

13. A method for evaluating a display device, comprising: outputting a pattern image for a viewpoint through a display panel; generating a measurement image by capturing the pattern image refracted by a lens array disposed on the display panel; as well as generating a brightness profile based on the measurement image, Wherein, each of the pattern images includes a pattern.

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