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

Abstract

A system for evaluating a display device includes: a display device including a display panel that outputs an image for a plurality of viewpoints and a lens array that refracts the image; and a viewing angle meter disposed on a measurement point of the display device and extracting a viewing angle for each of the plurality of viewpoints. The viewing angle meter determines an optimal viewing coordinate of the refracted image corresponding to each of the plurality of viewpoints based on the viewing angle.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to and the benefit of Korean Patent Application No. 10-2023-0134658 filed on October 10, 2023 in the Korean Intellectual Property Office (KIPO), 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 for evaluating a display device using the same. 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 viewer's visual senses 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 the viewer, so that the viewer can view a stereoscopic image due to binocular parallax between the left and right eyes.

[0006] Recently, a naked-eye stereo method without wearing stereo glasses has been actively studied. The naked-eye stereo method may include a lenticular lens method for separating left-eye and right-eye images using a cylindrical lens array, a barrier method for separating left-eye and right-eye images using a barrier, and the like.

[0007] The naked eye stereoscopic display device can form a light field composed of multiple viewpoints. If the viewer does not view the image on the display device at an optimal viewing distance, distortion may occur 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] A technical problem to be solved by the present disclosure is to provide a system for evaluating a display device capable of evaluating a display device that outputs images corresponding to a plurality of viewpoints with improved reliability and a method for evaluating a display device using the same.

[0010] Aspects of the present disclosure relate to a system for evaluating a display device. A system for evaluating a display device according to an embodiment of the present disclosure may include: a display device including a display panel outputting images for multiple viewpoints and a lens array for refracting an image; and a viewing angle meter disposed at a measurement point of the display device and extracting a viewing angle for each of the multiple viewpoints. The viewing angle meter may determine an optimal viewing coordinate of a refracted image corresponding to each of the multiple viewpoints based on the viewing angle.

[0011] The measurement points may include first and second measurement points arranged in the first direction, and the perspective meter may determine, as optimal viewing coordinates, points at which virtual lines extending along a viewing angle of a corresponding one of the plurality of viewpoints extracted from the first and second measurement points intersect.

[0012] The perspective meter may determine a distance in a first direction between a virtual line passing through a point of the display device and the optimal viewing coordinates.

[0013] The perspective meter may determine a distance between the measurement point and the optimal viewing coordinates in a second direction intersecting the first direction.

[0014] The view angle meter may generate a viewing angle distribution for each of a plurality of view points at a measurement point, and extract a maximum brightness angle of the viewing angle distribution as a main viewing angle for each of the plurality of view points.

[0015] The system for evaluating a display device may further include: a moving member that moves the perspective meter in a direction parallel to a plane in which the display device extends.

[0016] The plurality of viewpoints may include a first viewpoint group and a second viewpoint group. In the refraction image, an image corresponding to the first viewpoint group may be visually recognized by a left eye of a user of the display device, and an image corresponding to the second viewpoint group may be visually recognized by a right eye of the user.

[0017] The view meter may measure crosstalk of an image corresponding to the first viewpoint group and an image corresponding to the second viewpoint group.

[0018] The view meter may generate brightness distributions of the first view point group and the second view point group, and measure the crosstalk based on a ratio of brightness of the first view point group to brightness of the second view point group.

[0019] The crosstalk of the image corresponding to the first viewpoint group may be reduced as the brightness of the second viewpoint group decreases.

[0020] Another aspect of the present disclosure relates to a method for evaluating a display device. The method for evaluating a display device (the display device includes a display panel that outputs images for multiple viewpoints and a lens array that refracts the image) may include: outputting an image through the display panel; photographing the image refracted by the lens array at a measurement point; extracting a viewing angle for each of the multiple viewpoints at the measurement point; and determining an optimal viewing coordinate of the refracted image corresponding to each of the multiple viewpoints based on the viewing angle.

[0021] The measurement points may include first and second measurement points arranged in the first direction, and points at which virtual lines extending along viewing angles of corresponding ones of the plurality of viewpoints extracted from the first and second measurement points intersect may be determined as optimal viewing coordinates.

[0022] The optimal viewing coordinates may be determined based on a distance in the first direction between a virtual line passing through a point of the display device and the optimal viewing coordinates.

[0023] The optimal viewing coordinates may be determined based on a distance between the display device and the optimal viewing coordinates in a second direction intersecting the first direction.

[0024] Extracting the viewing angle for each of the plurality of viewpoints at the measurement point may include: generating a viewing angle distribution for each of the plurality of viewpoints at the measurement point; and extracting a maximum brightness angle of the viewing angle distribution as a main viewing angle for each of the plurality of viewpoints.

[0025] The plurality of viewpoints may include a first viewpoint group and a second viewpoint group. In the refracted image, an image corresponding to the first viewpoint group may be visually recognized by a left eye of a user of the display device, and an image corresponding to the second viewpoint group may be visually recognized by a right eye of the user.

[0026] The method for evaluating a display device may further include measuring a crosstalk of an image corresponding to the first viewpoint group and an image corresponding to the second viewpoint group.

[0027] Measuring the crosstalk of the image may include: generating brightness distributions of the first viewpoint group and the second viewpoint group; and measuring the crosstalk based on a ratio of brightness of the first viewpoint group and brightness of the second viewpoint group.

[0028] The crosstalk of the image corresponding to the first viewpoint group may be reduced as the brightness of the second viewpoint group decreases. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the principles of the disclosure.

[0030] Figure 1It is a schematic diagram for explaining a lens array type three-dimensional image display device.

[0031] Figure 2 is a schematic diagram for explaining the relationship between the lens array and the display panel.

[0032] Figure 3 is a schematic diagram illustrating a relationship between a view meter and a display device according to an embodiment of the present disclosure.

[0033] Figure 4 is a schematic diagram showing an embodiment of a display device that outputs a multi-view image at a measurement point.

[0034] Figure 5 It is shown Figure 3 A schematic block diagram of an implementation of a perspective meter.

[0035] Figure 6 It is shown by Figure 5 A graph of viewing angle distribution generated by the main controller.

[0036] Figure 7 It is schematically shown that Figure 4 Schematic diagram of a multi-view image output by a display device at a first measurement point to a third measurement point.

[0037] Figure 8 is a schematic diagram showing an embodiment of a display device that outputs a multi-view image at a measurement point.

[0038] Fig. 9 is a graph showing a luminance distribution generated by a view meter according to an embodiment of the present disclosure.

[0039] Fig.10 It is shown that according to Fig. 9 A graph of crosstalk distribution generated by a view angle meter according to an embodiment of the present disclosure based on brightness distribution.

[0040] Fig.11 It is schematically shown that Figure 8 Schematic diagram of a multi-view image output by a display device at a first measurement point and a second measurement point.

[0041] Fig.12 is a flowchart illustrating a method for evaluating a display device according to an embodiment of the present disclosure.

[0042] Fig.13 is a flowchart illustrating a method for evaluating a display device according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0043] 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. The present disclosure may be implemented in other forms, and is not limited to the embodiments described herein. However, the embodiments described herein are provided to be described in sufficient detail so that a technician in the field to which the present disclosure belongs can easily realize the technical spirit of the present disclosure.

[0044] When an element such as a layer is referred to as being "on" another element or layer, "connected to" or "coupled to" another element or layer, it may be directly on, directly connected to or directly coupled to another element or layer, or there may be an intervening element or layer. However, when an element or layer is referred to as being "directly on" another element or layer, "directly connected to" or "directly coupled to" another element or layer, there is no intervening element or layer. For this reason, the term "connection" may refer to a physical connection, electrical connection and / or fluid connection with or without an intervening element. The terms used herein are used to describe specific embodiments and are not intended to limit the present disclosure. Throughout the specification, in the case of a certain part "including", unless otherwise stated, the situation means that the part may also include another component without excluding another component. "At least any one of X, Y and Z" and "at least one selected from the group consisting of X, Y and Z" may be interpreted as any combination of one X, one Y, one Z or two or more of X, Y and Z (e.g., XYZ, XYY, YZ and ZZ). Here, “and / or” includes all combinations of one or more of the corresponding configurations.

[0045] 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.

[0046] Spatial relative terms such as "below", "above" etc. can be used for descriptive purposes, thereby describing the relationship between an element or feature and another (some) element or feature as shown in the drawings. In addition to the directions depicted in the drawings, spatial relative terms are intended to include other directions in use, in operation and / or in manufacture. For example, when the device shown in the drawings is inverted, the element depicted as being positioned "below" other elements or features is positioned in the direction "above" other elements or features. Therefore, in an embodiment, the term "below" can include both upper and lower directions. The device can face other directions (e.g., rotated 90 degrees or in other directions), and the spatial relative terms used herein are therefore interpreted according to it.

[0047] Various embodiments are described with reference to the accompanying drawings that schematically illustrate ideal embodiments. Therefore, it is expected that the shapes may vary, for example, depending on 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 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.

[0048] Unless otherwise defined or implied 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.

[0049] Figure 1 It is a schematic diagram for explaining a lens array type three-dimensional image display device.

[0050] refer to Figure 1 , the display device 100 may include a display panel DP and a lens array LSA.

[0051] 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.

[0052] 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.

[0053] 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 the viewer can see the depth and sides of an object, and may be a display technology that can be used in various ways by merging with AR (augmented reality) technology, etc.

[0054] The light field can be implemented in several ways. For example, the light field can be formed by a method of forming a light field in multiple directions using multiple projectors, a method of controlling the direction of light using a diffraction grating, a method of adjusting the direction and intensity (brightness) of light according to a combination of each pixel using two or more panels, a method for controlling the direction of light using a pinhole or a barrier, a method for controlling the direction of light refraction through a lens array, etc.

[0055] 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.

[0056] 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 by light intensity and direction. When a viewer looks at the display device 100 in the light field formed as described above, the viewer may feel a three-dimensional effect of the corresponding image.

[0057] Image information according to a viewer's viewpoint in a light field may be defined and processed in units of voxels. A voxel may be graphic information that defines a point (or pixel) in a 3D space.

[0058] The resolution of a 2D image may be determined by the number of pixels (e.g., density) in the same area. For example, the resolution may increase as the number of pixels in the same area increases. For example, a display panel DP with a high pixel density may be required for a high-resolution image. Similarly, the resolution of a stereoscopic image may increase as the number of voxels at the same viewpoint through the lens array LSA increases.

[0059] 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.

[0060] According to an embodiment, the display panel DP may be applied to a head mounted display device. The device to which the display panel DP is applied is not limited to the above-mentioned embodiment, and the display panel DP may also be applied to an electronic device having a display screen on at least one side.

[0061] Figure 2 is a schematic diagram for explaining the relationship between the lens array and the display panel.

[0062] 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 a light emitting surface in a third direction DR3 intersecting the first direction DR1 and the second direction DR2.

[0063] 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).

[0064] 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.

[0065] The lens array LSA may include lenses LS1, LS2, ..., and LSm, where m may be a natural number greater than 0. The lenses LS1 to LSm may be biconvex lenses.

[0066] 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 an embodiment, the angle ag1 may be 0 degrees.

[0067] 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 allocate an image corresponding to each of the viewpoint areas V1 to V39 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.

[0068] 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 schematically shown. The sub-pixels SPX corresponding to the same viewpoint area can display images for the same viewpoint. Figure 2As 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.

[0069] According to an embodiment, the display device 100 can display a stereoscopic image by displaying a left eye image using a sub-pixel SPX overlapping with the viewpoint areas V1 to V20 in the third direction DR3 and displaying a right 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.

[0070] Sub-pixels SPX can be arranged in various configurations such as RGB stripes, diamonds, S strip, real RGB, normal Various structures such as .

[0071] Figure 3 is a schematic diagram illustrating a relationship between a view meter and a display device according to an embodiment of the present disclosure. Figure 4 is a schematic diagram showing an embodiment of a display device that outputs a multi-view image at a measurement point.

[0072] 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 viewing angle meter 200 , and a moving member 300 .

[0073] refer to Figure 4 , the display device 100 may output a multi-view image in one direction. For example, the display device 100 may output a multi-view image substantially in a third direction DR3 through an upper surface of the display device 100 .

[0074] The display device 100 may output a multi-view image through each of a plurality of points on the upper surface of the display device 100. For example, the display device 100 may output a multi-view image for a plurality of viewpoints VW1, VW2, ... VWk, ..., and VWn at the measurement point MP, where k and n may be natural numbers greater than 1, and n>k. Figure 4 An embodiment in which a multi-view image is output at the measurement point MP is schematically illustrated, but the present disclosure is not limited thereto.

[0075] The display device 100 may output a multi-view image having a maximum viewing angle AOG at the measurement point MP. For example, based on the measurement point MP, the maximum viewing angle AOG may be an angle between a first viewpoint VW1 and a last viewpoint VWn among the viewpoints VW1 to VWn implemented in the display device 100. The viewpoints VW1 to VWn may be aligned with the reference point MP. Figure 2 The viewpoint areas V1 to V39 are described in one-to-one correspondence.

[0076] Display panel DP (see Figure 2 ) may include sub-pixel groups representing multi-view images for viewpoints VW1 to VWn. For example, among the sub-pixels SPX of the display panel DP, the sub-pixels SPX overlapping the first viewpoint region V1 in the third direction DR3 may be the first sub-pixel group, and the first sub-pixel group may output an image corresponding to the first viewpoint VW1. In addition, among the sub-pixels SPX, the sub-pixels SPX overlapping the thirty-ninth viewpoint region V39 (see FIG. 1 ) in the third direction DR3 may be the first sub-pixel group, and the first sub-pixel group may output an image corresponding to the first viewpoint VW1. Figure 2 ) may be a thirty-ninth sub-pixel group, and the thirty-ninth sub-pixel group may output an image corresponding to a thirty-ninth viewpoint. According to an embodiment, n may be 39, and the display device 100 may include at least 39 sub-pixel groups. Therefore, at a position corresponding to each of the viewpoints VW1 to VWn, a user of the display device 100 may visually recognize an image implemented by the sub-pixel SPX corresponding to each of the viewpoint areas V1 to V39.

[0077] The angle meter 200 may be provided on the display device 100. For example, the angle meter 200 may be provided on an upper surface of the display device 100 that outputs a multi-view image.

[0078] The angle meter 200 may capture the multi-view image output from the display device 100. For example, the angle meter 200 may include a lens. The lens included in the angle meter 200 may refract the light of the multi-view image emitted from the measurement point MP to travel straight, and the camera 210 (see Figure 5 ) can capture light that is refracted by the lens and travels straight. Therefore, the angle meter 200 can capture images for the viewpoints VW1 to VWn at the measurement point MP.

[0079] The moving member 300 may move the position of the angle meter 200. For example, the angle meter 200 may be moved in the first direction DR1 and / or the second direction DR2 by the moving member 300. Therefore, the angle meter 200 may capture images for viewpoints VW1 to VWn output from each of the points on the upper surface of the display device 100.

[0080] Figure 5 It is shown Figure 3 A schematic block diagram of an implementation of a perspective meter. Figure 6 It is shown by Figure 5 A graph of viewing angle distribution generated by the main controller.

[0081] refer to Figure 5 , the perspective meter 200 may include a camera 210 and a main controller 220 .

[0082] The camera 210 may capture images from the display device 100. For example, the camera 210 may capture images from a plurality of measurement points included in the upper surface of the display device 100.

[0083] The camera 210 may be any of a variety of cameras including a charge coupled device (CCD) camera. However, the camera 210 is not limited thereto as long as it can generate image data ID by photographing an image output by the display device 100.

[0084] refer to Figure 5 and Figure 6 , the main controller 220 may generate a viewing angle distribution of an image corresponding to each of the viewpoints VW1 to VWn output by the display device 100. For example, the camera 210 may send an image data ID photographed at the measurement point MP to the main controller 220. The main controller 220 may generate a viewing angle distribution based on the received image data ID. For example, the main controller 220 may receive an image data ID corresponding to a k-th viewpoint VWk, and generate a viewing angle distribution of an image corresponding to the k-th viewpoint VWk (hereinafter referred to as a k-th viewpoint viewing angle distribution).

[0085] The main controller 220 may extract a main viewing angle VA (see Figure 7 ). For example, the main controller 220 may identify an angle having the highest brightness in the viewing angle distribution of the k-th viewpoint VWk. The main controller 220 may determine the maximum brightness angle MLA of the image corresponding to the k-th viewpoint VWk. Therefore, the main controller 220 may extract the determined maximum brightness angle MLA as the main viewing angle VA of the image corresponding to the k-th viewpoint VWk.

[0086] Figure 7 It is schematically shown that Figure 4 Schematic diagram of a multi-view image output by a display device at a first measurement point to a third measurement point.

[0087] refer to Figure 7 , the display device 100 may include first to third measurement points MP1 to MP3 for outputting images. For example, the display device 100 may output images for viewpoints VW1 to VWn at the first to third measurement points MP1 to MP3 arranged in the first direction DR1. Figure 7 , among the images output by the display device 100 , images VWk_P1 to VWk_P3 for the k-th viewpoint VWk are described, and images for other viewpoints VW1 to VWn can be similarly described.

[0088] Angle meter 200 (see Figure 3) can extract the main viewing angle VA of the images VWk_P1 to VWk_P3 corresponding to the k-th viewpoint VWk output from the first measurement point MP1 to the third measurement point MP3. Figure 6 As described, the view meter 200 may generate the view distribution of the image VWk_P1 corresponding to the k-th viewpoint VWk output from the first measurement point MP1 , and based thereon, extract the first main view VA1 of the image corresponding to the k-th viewpoint VWk.

[0089] The view meter 200 may extract the second main view VA2 and the third main view VA3 of the images VWk_P2 and VWk_P3 corresponding to the k-th viewpoint VWk output from the second measurement point MP2 and the third measurement point MP3 in the same manner.

[0090] The multi-view image displayed by the display device 100 may have an optimal viewing distance corresponding to the k-th viewpoint VWk. 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 occur in the image and the visibility of the display device 100 may be reduced. Therefore, it may be necessary to accurately measure the optimal viewing distance of the multi-view image output by the display device 100.

[0091] According to an embodiment of the present disclosure, the viewing angle meter 200 may determine the optimal viewing coordinates OVP (eg, Figure 7 Optimal viewing coordinates OVP1, OVP2, OVP3, and OVP4 corresponding to four different viewpoints among the viewpoints VW1 to VWn are shown in FIG. 1 ). For example, the perspective meter 200 may determine a point where virtual lines extending along primary viewpoints VA1 to VA3 of a k-th viewpoint VWk extracted from the first measurement point MP1 to the third measurement point MP3 meet as the optimal viewing coordinate OVP3. Figure 7 An embodiment in which three measurement points MP1 to MP3 are present is shown, but the present disclosure is not limited thereto.

[0092] The angle meter 200 may determine a horizontal distance VD between the optimal viewing coordinates OVP and a virtual line (e.g., a center line ML passing through the center) passing through a point of the display device 100. For example, the angle meter 200 may determine a horizontal distance VD between the optimal viewing coordinates OVP3 of the k-th viewpoint VWk spaced apart in the first direction DR1 and the center line ML. The angle meter 200 may determine a vertical distance HD between the optimal viewing coordinates OVP and the display device 100. For example, the angle meter 200 may determine a vertical distance HD spaced apart between the optimal viewing coordinates OVP3 of the k-th viewpoint VWk and the display device 100 in the third direction DR3. Therefore, the system 1000 for evaluating a display device may evaluate the display device 100 by quantifying the optimal viewing coordinates OVP of the viewpoints VW1 to VWn.

[0093] Figure 8 is a schematic diagram showing an embodiment of a display device that outputs a multi-view image at a measurement point. Fig. 9 is a graph showing a luminance distribution generated by a view meter according to an embodiment of the present disclosure. Fig.10 It is shown that according to Fig. 9 A graph of crosstalk distribution generated by a view angle meter according to an embodiment of the present disclosure based on brightness distribution. Fig.11 It is schematically shown that Figure 8 Schematic diagram of a multi-view image output by a display device at a first measurement point and a second measurement point.

[0094] Figure 8 The display device 100 ′ can be used with Figure 3 The display device 100 is similarly described, and overlapping descriptions will be omitted below.

[0095] refer to Figure 8 , the display device 100' may output a multi-view image through each of a plurality of points on the upper surface of the display device 100'. For example, the display device 100' may output an image corresponding to the first viewpoint group VWL and the second viewpoint group VWR at the measurement point MP'. Figure 8 An embodiment in which an image is output at the measurement point MP′ is shown, but the present disclosure is not limited thereto.

[0096] The first viewpoint group VWL may include first to third left-eye viewpoints VWL_1 to VWL_3 . The second viewpoint group VWR may include first to third right-eye viewpoints VWR_1 , VWR_2 , and VWR_3 .

[0097] The images corresponding to the first viewpoint group VWL may be recognized by the left-eye vision of the user of the display device 100 ′. The images corresponding to the first to third left-eye viewpoints VWL_1 to VWL_3 may be substantially the same images.

[0098] The images corresponding to the second viewpoint group VWR may be recognized by the right eye vision of the user of the display device 100 ′. The images corresponding to the first to third right-eye viewpoints VWR_1 to VWR_3 may be substantially the same images.

[0099] According to an embodiment of the present disclosure, even when the user's position is slightly changed, the stereoscopic image visually recognized by the user may not be distorted. For example, the image corresponding to the first left-eye viewpoint VWL_1 may be visually recognized by the user's left eye. Even when the user's position is moved and the image corresponding to the second left-eye viewpoint VWL_2 is visually recognized by the user's left eye, the user of the display device 100' may visually recognize substantially the same image. Therefore, the quality of the multi-view image output by the display device 100' may be improved.

[0100] Reference together Figure 5 as well as Figures 8 to 10 , the perspective meter 200 can measure the crosstalk that occurs in the image corresponding to the first viewpoint group VWL and the image corresponding to the second viewpoint group VWR. For example, the perspective meter 200 can generate the brightness distribution of the first viewpoint group VWL and the second viewpoint group VWR based on the image data ID obtained by photographing the measurement point MP' by the camera 210. For example, the perspective meter 200 can generate a brightness distribution including the brightness LP_VWL of the first viewpoint group VWL and the brightness LP_VWR of the second viewpoint group VWR. The perspective meter 200 can measure the crosstalk of the first viewpoint group VWL and the second viewpoint group VWR based on the generated brightness distribution to generate a crosstalk distribution. The perspective meter 200 can measure the crosstalk based on the ratio of the brightness LP_VWL of the first viewpoint group VWL and the brightness LP_VWR of the second viewpoint group VWR. For example, the viewing angle meter 200 may measure a value obtained by dividing the brightness LP_VWR of the second view group VWR by the brightness LP_VWL of the first view group VWL as the crosstalk CP_VWL of the first view group VWL. In addition, the viewing angle meter 200 may measure the crosstalk CP_VWR of the second view group VWR in substantially the same manner, and may generate a crosstalk distribution including the crosstalk CP_VWL of the first view group VWL and the crosstalk CP_VWR of the second view group VWR.

[0101] According to an embodiment of the present disclosure, the perspective meter 200 can extract the main viewing angle VA' of each of the images corresponding to the first viewpoint group VWL and the second viewpoint group VWR. For example, the perspective meter 200 can determine the angle MCA at which the crosstalk CP_VWL of the first viewpoint group VWL and the crosstalk CP_VWR of the second viewpoint group VWR are respectively minimized. The crosstalk CP_VWL of the first viewpoint group VWL can decrease as the brightness LP_VWR of the second viewpoint group VWR decreases, and can decrease as the brightness LP_VWL of the first viewpoint group VWL increases. Therefore, the perspective meter 200 can determine the angle MCA_L at which the crosstalk CP_VWL of the first viewpoint group VWL is minimized, and extract it as the main viewing angle VA'. Similarly, the perspective meter 200 can determine the angle MCA_R at which the crosstalk CP_VWR of the second viewpoint group VWR is minimized, and extract it as the main viewing angle.

[0102] refer to Fig.11 , the display device 100' may include a first measurement point MP1' and a second measurement point MP2' for outputting an image. For example, the display device 100 may output images for the first viewpoint group VWL and the second viewpoint group VWR at the first measurement point MP1' and the second measurement point MP2' arranged in the first direction DR1, respectively. Fig.11 In the image output by the display device 100 ′, the image for the first viewpoint group VWL is described, and the image for the second viewpoint group VWR can also be described similarly.

[0103] The angle meter 200 may extract the main angle VA' of the image corresponding to the first viewpoint group VWL outputted from the first and second measuring points MP1' and MP2'. For example, as described above, the angle meter 200 may extract the main angles VA1' and VA2' of the images VWL_P1 and VWL_P2 outputted from the first measuring point MP1'.

[0104] According to an embodiment of the present disclosure, the angle meter 200 may determine the optimal viewing coordinate OVP' of the first viewpoint group VWL. For example, the angle meter 200 may determine the point where the virtual lines extending along the main viewing angles VA1' and VA2' of the first viewpoint group VWL extracted from the first measurement point MP1' and the second measurement point MP2' meet as the optimal viewing coordinate OVP_L. Similarly, the angle meter 200 may determine the point where the virtual lines extending along the main viewing angles of the second viewpoint group VWR extracted from the first measurement point MP1' and the second measurement point MP2' meet as the optimal viewing coordinate OVP_R. Fig.11 An embodiment in which two measurement points MP1 ′ and MP2 ′ exist is shown, but the present disclosure is not limited thereto.

[0105] Fig.12is a flowchart illustrating a method for evaluating a display device according to an embodiment of the present disclosure.

[0106] refer to Fig.12 According to an embodiment, a method for evaluating a display device may include outputting images for a plurality of viewpoints through a display panel (S1210), photographing an image refracted by a lens array at a measurement point (S1220), extracting a viewing angle of each of the viewpoints at the measurement point (S1230), and determining optimal viewing coordinates of the refracted image corresponding to each of the viewpoints based on the viewing angle (S1240).

[0107] refer to Figure 4 and Fig.12 In operation S1210, images for the viewpoints VW1 to VWn may be output. For example, each of the sub-pixel groups of the display panel DP may output a corresponding image of the viewpoints VW1 to VWn.

[0108] refer to Figure 3 and Fig.12 In operation S1220, the image obtained by the lens array LSA (see Figure 1 For example, the perspective meter 200 may capture a multi-view image output from the measurement point MP of the display device 100.

[0109] In this operation, the angle meter 200 may capture a multi-view image output from each of the measurement points of the display device 100. For example, the angle meter 200 may be moved in a horizontal direction (e.g., the first direction DR1 or the second direction DR2) by the moving member 300. Therefore, the angle meter 200 may capture a multi-view image output from the measurement points of the display device 100 other than the measurement point MP.

[0110] refer to Figure 4 , Figure 6 and Fig.12 , in operation S1230, the main viewing angle VA of each of the viewpoints VW1 to VWn at the measurement point MP may be extracted. For example, the view angle meter 200 may generate a viewing angle distribution of a k-th viewpoint VWk, which is one of the viewpoints VW1 to VWn at the measurement point MP. Therefore, the view angle meter 200 may determine a maximum brightness angle MLA of an image corresponding to the k-th viewpoint VWk based on the viewing angle distribution, and extract the maximum brightness angle MLA as the main viewing angle VA of the k-th viewpoint VWk.

[0111] refer to Figure 4 , Figure 7 and Fig.12, in operation S1240, the optimal viewing coordinates OVP of the image corresponding to each of the viewpoints VW1 to VWn may be determined based on the main viewing angle VA. For example, the angle meter 200 may determine the point where a virtual line extending along the main viewing angle VA of the k-th viewpoint VWk output from the first measurement point MP1 to the third measurement point MP3 meets as the optimal viewing coordinates OVP3. Thereafter, the angle meter 200 may determine the optimal viewing coordinates OVP of the image corresponding to the viewpoints other than the k-th viewpoint VWk.

[0112] Fig.13 is a flowchart illustrating a method for evaluating a display device according to an embodiment of the present disclosure.

[0113] refer to Fig.13 According to an embodiment, a method for evaluating a display device may include outputting images for multiple viewpoints through a display panel (S1310), photographing an image refracted by a lens array at a measurement point (S1320), measuring crosstalk between an image corresponding to a first viewpoint group and an image corresponding to a second viewpoint group (S1330), extracting a viewing angle of each of the viewpoints at the measurement point (S1340), and determining optimal viewing coordinates of a refracted image corresponding to each of the viewpoints based on the viewing angle (S1350).

[0114] Fig.13 Operations S1310 and S1320 may be performed with Fig.12 Operations S1210 and S1220 are similar, and overlapping descriptions will be omitted below.

[0115] refer to Figures 8 to 11 as well as Fig.13 In operation S1330, the crosstalk of the image corresponding to the first viewpoint group VWL and the image corresponding to the second viewpoint group VWR may be measured. For example, the viewing angle meter 200 may generate a brightness distribution of the first viewpoint group VWL and a brightness distribution of the second viewpoint group VWR. The viewing angle meter 200 may generate a crosstalk distribution based on the generated brightness distribution. The image corresponding to the first viewpoint group VWL may be visually recognized by the left eye of the user of the display device 100', and the image corresponding to the second viewpoint group VWR may be visually recognized by the right eye of the user of the display device 100'.

[0116] refer to Figures 8 to 11 as well as Fig.13 , in operation S1340, the main viewing angle VA of each of the first viewpoint group VWL and the second viewpoint group VWR at the measurement point MP' may be extracted. For example, the angle meter 200 may determine the angle MCA_L at which the crosstalk CP_VWL of the first viewpoint group VWL at the measurement point MP' is minimized. The angle meter 200 may extract the angle MCA_L at which the crosstalk CP_VWL of the first viewpoint group VWL is minimized as the main viewing angle VA' of the first viewpoint group VWL.

[0117] refer to Figures 8 to 11 as well as Fig.13 In operation S1350, the optimal viewing coordinate OVP' of the image corresponding to each of the first viewpoint group VWL and the second viewpoint group VWR may be determined based on the main viewing angle VA'. For example, the viewing angle meter 200 may determine the point where virtual lines extending along the main viewing angles VA1' and VA2' of the first viewpoint group VWL overlap with each other at the first measurement point MP1' and the second measurement point MP2' as the optimal viewing coordinate OVP_L of the image corresponding to the first viewpoint group VWL.

[0118] According to an embodiment of the present disclosure, the perspective meter 200 can determine the optimal viewing coordinates OVP' of each of the images visually recognized by the left and right eyes of the user of the display device 100'. Therefore, the system 1000 for evaluating a display device can evaluate the display device 100' outputting a multi-view image with improved reliability.

[0119] The system and method for evaluating a display device according to the present disclosure can evaluate a display device that outputs images corresponding to a plurality of viewpoints with improved reliability.

[0120] 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.

[0121] 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 that outputs images for a plurality of viewpoints and a lens array that refracts the images; as well as a viewing angle meter disposed at a measuring point of the display device and extracting a viewing angle for each of the plurality of viewing points, The perspective meter determines optimal viewing coordinates of the refracted image corresponding to each of the plurality of viewpoints based on the viewing angle.

2. The system according to claim 1, wherein: The measuring points include a first measuring point and a second measuring point arranged in a first direction, and The perspective meter determines a point at which virtual lines extending along a viewing angle of a corresponding one of the plurality of viewpoints extracted from the first measurement point and the second measurement point meet as the optimal viewing coordinate.

3. The system according to claim 2, wherein: The perspective meter determines a distance in the first direction between a virtual line passing through a point of the display device and the optimal viewing coordinate.

4. The system according to claim 2, wherein: The perimeter determines a distance between the measurement point and the optimal viewing coordinate in a second direction intersecting the first direction.

5. The system according to claim 1, wherein: The view meter generates a viewing angle distribution for each of the plurality of view points at the measurement point, and extracts a maximum brightness angle of the viewing angle distribution as a main viewing angle for each of the plurality of view points.

6. The system according to claim 1, further comprising: A moving member moves the angle meter in a direction parallel to a plane in which the display device extends.

7. The system according to claim 1, wherein: The plurality of viewpoints include a first viewpoint group and a second viewpoint group, In the refraction image, an image corresponding to the first viewpoint group is visually recognized by a left eye of a user of the display device, and The image corresponding to the second viewpoint group is visually recognized by the right eye of the user.

8. The system according to claim 7, wherein: The perspective meter measures crosstalk of the image corresponding to the first viewpoint group and the image corresponding to the second viewpoint group.

9. The system according to claim 8, wherein: The view meter generates brightness distributions of the first viewpoint group and the second viewpoint group, and measures the crosstalk based on a ratio of brightness of the first viewpoint group and brightness of the second viewpoint group.

10. The system according to claim 9, wherein: The crosstalk of the image corresponding to the first viewpoint group decreases as the brightness of the second viewpoint group decreases.

11. A method for evaluating a display device, the display device comprising a display panel that outputs images for a plurality of viewpoints and a lens array that refracts the images, characterized in that: The method comprises: outputting the image through the display panel; capturing the image refracted by the lens array at a measuring point; extracting a viewing angle for each of the plurality of viewpoints at the measurement point; and Optimal viewing coordinates of a refracted image corresponding to each of the plurality of viewpoints are determined based on the viewing angle.

Images