Light emission characteristics measuring system for display panel and method thereof

Abstract

A system for measuring the light emission characteristics of a display panel according to one embodiment of the present invention includes a display placement unit, a scanning unit, and a control unit. In the display placement unit, a panel placement surface is defined on which a display panel comprising a plurality of pixels emitting light is placed. The scanning unit includes a light receiving unit that receives the emitted light. The control unit measures information regarding the light received by the light receiving unit and measures the light emission characteristics of the display panel through the information regarding the received light. The light receiving unit may be located at a plurality of points.

Description

Technology Field

[0001] The present invention relates to a system and method for measuring the light emission characteristics of a display panel, and more specifically, to a system and method for measuring the light emission characteristics of a display panel in which the display panel is scanned by a scanning unit and the light coupling efficiency, diffusion angle, and steering angle of the display panel are measured. Background Technology

[0002] A head-mounted display is a display device worn on the head that can be used to implement virtual reality or augmented reality. The head-mounted display may include a microdisplay and an optical system.

[0003] Microdisplays are ultra-high-resolution display panels with high pixel density at the level of thousands of PPI (Pixels Per Inch). Optical systems can guide light emitted from microdisplays to the user's eyes. To improve head-mounted displays, the proportion of light emitted from microdisplays that enters the optical system may need to be increased.

[0004] Therefore, there is a need for a measurement system that measures the emission characteristics of light emitted from a microdisplay to measure and evaluate the ratio of light input into the optical system among the light emitted from the microdisplay. The problem to be solved

[0005] The object of the present invention is to provide a light emission characteristic measurement system and a method thereof, wherein the light coupling efficiency, diffusion angle, and steering angle of a display panel are measured, thereby enabling the evaluation of a display panel used in a head-mounted display device. means of solving the problem

[0006] A system for measuring the light emission characteristics of a display panel according to an embodiment of the present invention may include a display placement unit, a scanning unit, and a control unit. The display placement unit may include a panel support unit and a panel fixing unit. A panel placement surface may be defined in the display placement unit. A display panel including a plurality of pixels that emit light may be placed on the panel placement surface. The panel fixing unit may fix the display panel. The scanning unit may include a scan moving unit and a light receiving unit. A light receiving surface may be defined in the scan moving unit. The light receiving surface may be spaced apart from the panel support unit and may face the upper panel placement surface. The light receiving unit may be placed on the light receiving surface and may receive the emitted light. The scan moving unit may move the light receiving unit. The control unit may measure information regarding the light received by the light receiving unit. The control unit may measure the light emission characteristics of the display panel through the information regarding the received light. The light receiving unit may be located at a plurality of points. The light receiving unit can receive emitted light emitted from the first pixels among the plurality of pixels at a first point among the plurality of points. The light receiving unit can receive emitted light emitted from the second pixels among the plurality of pixels that are different from the first pixels at a second point among the plurality of points that is different from the first point.

[0007] In one embodiment of the present invention, the plurality of points may be located on a predetermined small can movement surface. The plurality of points may be arranged in a first scan direction and a second scan direction intersecting the first scan direction.

[0008] In one embodiment of the present invention, a plurality of scanning rows may be defined that extend in the first scanning direction and are arranged at a predetermined row interval in the second scanning direction. Additionally, a plurality of scanning columns may be defined that extend in the second scanning direction and are arranged at a predetermined column interval in the first scanning direction. The plurality of points may be located at the points where the plurality of scanning rows and the plurality of scanning columns intersect. The light receiving unit may be located at each of the plurality of points located in the first scanning row among the plurality of scanning rows. Subsequently, the light receiving unit may be located at each of the plurality of points located in the second scanning row, which is different from the first scanning row among the plurality of scanning rows.

[0009] In one embodiment of the present invention, the light receiving unit may include a photoelectric converter that receives the emitted light and converts it into electricity. The control unit may measure the amount of light received through the current value measured by the light receiving unit.

[0010] In one embodiment of the present invention, the size of the photoelectric conversion element may be 50 nm or more and 1,000 μm or less.

[0011] In one embodiment of the present invention, a spectrometer that separates incident light by wavelength may be further included. The light receiving unit may include a first sub-light receiving unit and a second sub-light receiving unit. The second sub-light receiving unit may be spaced apart from the first sub-light receiving unit. The first sub-light receiving unit may include the photoelectric conversion element. The control unit may measure the amount of light emitted from the first sub-light receiving unit through the current value measured at the first sub-light receiving unit. The control unit may measure the light emission characteristics of the display panel through the relationship between the position of the first sub-light receiving unit and the amount of light emitted from the light. The emitted light received from the second sub-light receiving unit may be incident on the spectrometer. The spectrometer may separate the emitted light by wavelength. The control unit may measure the amount of light emitted from the second sub-light receiving unit by wavelength. The control unit can measure the light emission characteristics of the display panel by wavelength through the relationship between the position of the second sub-light receiving unit and the amount of light emitted.

[0012] In one embodiment of the present invention, a spectrometer that separates incident light by wavelength may be further included. The emitted light received from the light receiving unit may be incident on the spectrometer. The emitted light may be separated by wavelength in the spectrometer. The control unit may measure the amount of light of the emitted light received from the light receiving unit by wavelength. The control unit may measure the light emission characteristics of the display panel by wavelength through the relationship between the position of the light receiving unit and the amount of light of the emitted light.

[0013] In one embodiment of the present invention, the light receiving unit may include a plurality of sub-light receiving units that are positioned at different locations and receive the emitted light. The plurality of sub-light receiving units may be arranged on the light receiving surface. The control unit may measure the amount of light of the emitted light received from the plurality of sub-light receiving units. The control unit may measure the light emission characteristics of the display panel through the relationship between the positions of the plurality of sub-light receiving units and the amount of light of the emitted light.

[0014] In one embodiment of the present invention, an alignment light transmitter and an alignment light receiver may be further included. The alignment light transmitter may be disposed on either the panel support and the scan moving unit. The alignment light transmitter may emit alignment light. The alignment light receiver may be disposed on either the panel support or the scan moving unit where the alignment light transmitter is not disposed. The alignment light receiver may receive the alignment light. When the alignment light receiver receives the alignment light, the position of the receiving unit may be identified as a predetermined alignment position.

[0015] In one embodiment of the present invention, the alignment light transmitter may include three or more sub-alignment light transmitters that emit the alignment light. The alignment light receiver may include a plurality of sub-receiving units, each corresponding to the sub-alignment light transmitters. Each of the plurality of sub-receiving units may receive the alignment light from a corresponding sub-alignment light transmitter among the plurality of sub-alignment light transmitters. Each of the plurality of sub-alignment light receiving units may measure the amount of the alignment light received. If the difference between the amount of the alignment light measured at each of the plurality of sub-alignment light receiving units is within a predetermined error range, the position of the receiving unit may be identified as the alignment position.

[0016] In one embodiment of the present invention, the alignment light transmitter may include three or more sub-alignment light transmitters that emit the alignment light. The alignment light receiver may include a plurality of sub-receiving units, each corresponding to the sub-alignment light transmitters. Each of the plurality of sub-receiving units may receive the alignment light from a corresponding sub-alignment light transmitter among the plurality of sub-alignment light transmitters. When each of the plurality of sub-alignment light receiving units receives the alignment light, each of the positions of the receiving units may be identified as a plurality of sub-alignment positions. The alignment position may be identified from the plurality of sub-alignment positions.

[0017] In one embodiment of the present invention, the direction in which the panel arrangement surface and the light receiving surface face, and the angle between the panel arrangement surface and the light receiving surface can be adjusted.

[0018] In one embodiment of the present invention, a lens arrangement may be further included. An optical lens that emits or converges incident light may be arranged in the lens arrangement. The lens arrangement may be located between the panel support and the scanning unit.

[0019] In one embodiment of the present invention, a predetermined area on the scan moving surface is defined as a coupling range. Some of the plurality of points are located within the coupling range. The light emission characteristic of the display panel measured by the control unit is the light coupling efficiency. The light coupling efficiency may be the ratio of the amount of emitted light received while the light receiving unit is located within the coupling range to the amount of emitted light received while the light receiving unit is located at each of the plurality of points.

[0020] In one embodiment of the present invention, the emitted light from each of the plurality of pixels or from a light-emitting group including a portion of the plurality of pixels that emits light may be emitted in a predetermined emission direction. Among the emitted light emitted from each of the plurality of pixels or from the light-emitting group, a cone, polygonal pyramid, frustum of a cone, or frustum of a polygonal pyramid centered on the emission direction may be defined as the central light. The central light may include light with a predetermined diffusion ratio among the emitted light emitted from each of the plurality of pixels. The angle between the generatrix or edge of the central light and the emission direction may be defined as the diffusion angle. The light emission characteristic of the display panel measured by the control unit may be the diffusion angle. The diffusion angle may be determined by the emission direction and the position of the central light through information regarding the light received by the light-receiving unit while the light-receiving unit is located at each of the plurality of points. The diffusion angle may be measured through the emission direction and the position of the central light.

[0021] In one embodiment of the present invention, the emitted light from each of the plurality of pixels or from a light-emitting group including a portion of the plurality of pixels that emits light may be emitted in a predetermined emission direction. The angle between the direction perpendicular to the display panel and the emission direction may be defined as the steering angle. The light emission characteristic of the display panel measured by the control unit may be the steering angle. The emission direction may be measured through information regarding the light received by the light receiving unit while the light receiving unit is located at each of the plurality of points. The steering angle may be measured through the emission direction.

[0022] A method for measuring the light emission characteristics of a display panel according to an embodiment of the present invention may include a panel placement step, an emission step, a light reception step, a measurement step, a movement step, and an analysis step. In the panel placement step, a display panel including a plurality of pixels that emit light may be placed on a panel support. In the emission step, light may be emitted from the display panel placed on the panel support. In the light reception step, light emitted from some of the plurality of pixels may be received by a light reception part located at any one of a plurality of points. In the measurement step, information regarding the light of the received light may be measured. In the movement step, the position of the light reception part may be changed to any one of the plurality of points. In the analysis step, the light emission characteristics of the display panel may be measured through the information regarding the light of the received light. The light reception step, the measurement step, and the movement step may be performed multiple times. In the light receiving step, if the light receiving unit is located at a first point among the plurality of points, emitted light emitted from the first pixels among the plurality of pixels can be received. In the light receiving step, if the light receiving unit is located at a second point among the plurality of points that is different from the first point, emitted light emitted from the second pixels among the plurality of pixels that are different from the first pixels can be received.

[0023] In one embodiment of the present invention, some of the plurality of points may be located within a predetermined coupling range. The light emission characteristic of the display panel measured in the analysis step may be a light coupling efficiency. The light coupling efficiency may be the ratio of the amount of emitted light received while the light receiving part is located within the coupling range to the amount of emitted light received while the light receiving part is located within the coupling range, to the amount of emitted light received while the light receiving step, the measurement step, and the movement step are performed multiple times.

[0024] In one embodiment of the present invention, the emitted light from each of the plurality of pixels or from a light-emitting group including a portion of the plurality of pixels that emits light may be emitted in a predetermined emission direction. Among the emitted light emitted from each of the plurality of pixels or from the light-emitting group, a cone, polygonal pyramid, frustum of a cone, or frustum of a polygon centered on the emission direction may be defined as the central light. The central light may include light with a predetermined diffusion ratio among the emitted light emitted from each of the plurality of pixels. The angle between the generatrix or edge of the central light and the emission direction may be defined as the diffusion angle. The light emission characteristic of the display panel measured in the analysis step may be the diffusion angle. During the performance of the light reception step, the measurement step, and the movement step multiple times, the emission direction and the position of the central light may be measured through information regarding the position of the light reception unit and the light received from the light reception unit. The diffusion angle may be measured through the emission direction and the position of the central light.

[0025] In one embodiment of the present invention, the emitted light emitted from each of the plurality of pixels or from a light-emitting group including a portion of the plurality of pixels that emits light may be emitted in a predetermined emission direction. The angle between the direction perpendicular to the display panel and the emission direction may be defined as the steering angle. The light emission characteristic of the display panel measured in the analysis step may be the steering angle. The emission direction may be measured through information regarding the position of the light receiving unit and the light received from the light receiving unit while the light receiving step, the measurement step, and the movement step are performed multiple times. The steering angle may be measured through the emission direction. Effects of the invention

[0026] In one embodiment of the present invention, a display panel is scanned by a scanning unit, and the optical coupling efficiency, diffusion angle, and steering angle of the display panel can be measured. Therefore, a light emission characteristic measurement system and a method capable of evaluating a display panel used in a head-mounted display device can be provided. Brief explanation of the drawing

[0027] FIG. 1 is an exemplary side view of a light emission characteristic measurement system of a display panel according to one embodiment of the present invention. FIG. 2 is an exemplary front view of a display arrangement section according to one embodiment of the present invention. FIG. 3 is an exemplary front view of a scanning unit according to one embodiment of the present invention. FIG. 4 is a side view illustrating the path of an alignment light in an exemplary manner, illustrating a display placement unit, a scanning unit, and an alignment unit according to an embodiment of the present invention. FIGS. 5A and 5B illustrate the path of alignment light in a side view illustrating, in an exemplary manner, a display placement section, a scanning section, and an alignment section according to an embodiment of the present invention. FIG. 6 is a side view illustrating, in which the path of the emitted light, the scan movement plane, and the coupling range are illustrated in an exemplary manner, in a display arrangement section and a scan section according to one embodiment of the present invention. FIG. 7 is a side view illustrating, in which the path, emission direction, and diffusion angle of the emitted light are illustrated in an exemplary manner, in which a display arrangement section and a scanning section according to one embodiment of the present invention are illustrated. FIG. 8 is a side view illustrating, in which the path, emission direction, vertical direction, and steering angle of the emitted light are illustrated in an exemplary manner, in which a display arrangement section and a scanning section according to one embodiment of the present invention are illustrated in an exemplary manner. FIG. 9 is an exemplary flowchart illustrating a method of driving a light emission characteristic measurement system according to one embodiment of the present invention. FIG. 10 is an exemplary front view of a scanning unit according to one embodiment of the present invention. FIG. 11 is an exemplary front view of a scanning unit according to one embodiment of the present invention. FIG. 12 is a side view illustrating the path of an alignment light in an exemplary manner, illustrating a display placement unit, a scanning unit, and an alignment unit according to an embodiment of the present invention. FIG. 13 is an exemplary front view of a display arrangement section according to one embodiment of the present invention. FIG. 14 is an exemplary front view of a scanning unit according to one embodiment of the present invention. FIG. 15 is a side view illustrating the path of an alignment light in an exemplary manner, illustrating a display placement unit, a scanning unit, and an alignment unit according to an embodiment of the present invention. Specific details for implementing the invention

[0028] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0029] In the drawings, the proportions and dimensions of the components are exaggerated for the effective illustration of the technical content. “And / or” includes all one or more combinations that the associated components may define.

[0030] When a component or layer is referred to as "above" another component or layer, it includes cases where the component is located directly above another component or where another layer or component is interposed in between. Conversely, when a component is referred to as "directly above," it indicates that no other component or layer is interposed in between. Throughout the specification, the same reference numerals refer to the same components.

[0031] Terms such as "include" are intended to indicate the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not excluding in advance the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0032] FIG. 1 is an exemplary side view of a light emission characteristic measurement system (1) of a display panel according to one embodiment of the present invention.

[0033] Referring to FIG. 1, a light emission characteristic measurement system (1) of a display panel may include a measuring device (10), a display panel (20), and an optical lens (30). The measuring device (10) may include a distance adjustment unit (100), a display placement unit (200), a scanning unit (300), an alignment unit (400), a lens placement unit (500), and an information processing unit (600). The display panel (20) and the optical lens (30) may be placed in the measuring device (10).

[0034] A display placement unit (200), a scanning unit (300), and a lens placement unit (500) may be arranged in the distance adjustment unit (100). The distance adjustment unit (100) may be extended in the direction defined by the first direction axis (DR1). Also, the directions indicated by the first to third direction axes (DR1, DR2, DR3) may be converted to other directions as a relative concept. Hereinafter, the first to third directions (DR1, DR2, DR3) refer to the same reference numeral for the directions indicated by the first to third direction axes (DR1, DR2, DR3), respectively.

[0035] The distance adjustment unit (100) can move the display placement unit (200), the scan unit (300), and the lens placement unit (500) in a first direction (DR1). Additionally, the distance adjustment unit (100) can adjust the distance between the display placement unit (200), the scan unit (300), and the lens placement unit (500). The distance adjustment unit (100) can cause the display placement unit (200), the scan unit (300), and the lens placement unit (500) to be spaced apart from each other.

[0036] The display placement section (200) may include a display stand (210) and a panel support section (220). A display panel (20) may be placed in the display placement section (200). The display panel (20) may include a plurality of pixels. Each of the plurality of pixels may emit light. Accordingly, the display panel (20) may also emit light. Furthermore, the light emission characteristics of the display panel (20) can be measured through the configurations to be described later.

[0037] The display stand (210) can be placed on the distance adjustment unit (100). The display stand (210) can be extended in a third direction (DR3). It can also rotate about the third direction axis (DR3). Additionally, a part of the display stand (210) can be folded or bent. Thus, the panel support (220) can be tilted to one side.

[0038] The panel support (220) can come into contact with the display stand (210). The display panel (20) can be placed on the panel support (220). The display panel (20) placed on the panel support (220) can be fixed to the panel support (220). The method of fixing the display panel (20) to the panel support (220) will be explained in more detail later through a separate drawing.

[0039] The panel support (220) can move in a third direction (DR3). For example, the panel support (220) can move in a third direction (DR3) along a rail arranged along the extension direction of the display stand (210).

[0040] Additionally, the panel support (220) can move in a second direction (DR2). For example, another rail is placed at the location where the panel support (220) and the display stand (210) come into contact, so that the panel support (220) can move in a second direction (DR2).

[0041] Meanwhile, the method of movement and the direction of movement of the panel support member (220) are not limited to the above. The panel support member (220) may be moved by a method other than the method described above. Also, the panel support member (220) may be moved in a direction other than the second direction (DR2) and the third direction (DR3).

[0042] The scanning unit (300) may include a scanning stand (310), a scanning moving unit (320), and a light receiving unit (330). The scanning unit (300) can scan emitted light emitted from the display panel (20).

[0043] The scan stand (310) can be placed on the distance adjustment unit (100). The scan stand (310) can be extended in a third direction (DR3). It can also be rotated about the third direction axis (DR3). Additionally, a part of the scan stand (310) can be folded or bent. Thus, the scan moving unit (320) can be tilted to one side.

[0044] The scan moving part (320) can come into contact with the scan stand (310). The scan moving part (320) can move on a predetermined scan moving surface. The scan moving part (320) can be spaced apart from the panel support part (220).

[0045] The scan moving part (320) can move in a third direction (DR3). For example, the scan moving part (320) can move in a third direction (DR3) along a rail arranged along the extension direction of the scan stand (310).

[0046] Additionally, the scan moving part (320) can move in a second direction (DR2). For example, a rail is placed at a position where the scan moving part (320) and the scan stand (310) come into contact, so that the scan moving part (320) can move in a second direction (DR2).

[0047] The scan movement plane can be defined as a first scan direction and a second scan direction. Meanwhile, in FIG. 1, the first scan direction may be the second direction (DR2) and the second scan direction may be the third direction (DR3). Therefore, the scan movement plane can be defined as the second direction (DR2) and the third direction (DR3).

[0048] Meanwhile, the movement method and direction of movement of the scan moving unit (320) are not limited to the above. The scan moving unit (320) may move through a method different from the method described above. Also, the scan moving unit (320) may move in a direction other than the second direction (DR2) and the third direction (DR3). Therefore, the scan moving surface may not be a surface defined as the second direction (DR2) and the third direction (DR3).

[0049] The light receiving unit (330) can be placed on the scan moving unit (320). Thus, the light receiving unit (330) can move along the scan moving unit (320), and the scan moving unit (320) can move the light receiving unit (330).

[0050] The light receiving unit (330) can receive emitted light emitted from the display panel (20). The light receiving unit (330) may include a photoelectric conversion element that receives the emitted light and converts it into electricity. The photoelectric conversion element may receive light in the ultraviolet to infrared wavelength range and convert it into electricity, or receive light in a specific wavelength range and convert it into electricity. The photoelectric conversion element included in the light receiving unit (330) may be a photodiode. The amount of light received by the light receiving unit (330) can be measured through the current value measured by the photoelectric conversion element.

[0051] In addition, the size of the photoelectric conversion element may be 50 nm or more and 1,000 μm or less. The light receiving part (330) may receive light in an area of ​​1 square millimeter or less. Meanwhile, the size of the display panel (20) may be larger than the size of the light receiving part (330). For example, the size of the display panel (20) may be 1 cm or more.

[0052] Additionally, the light receiving unit (330) can receive and transmit the emitted light emitted from the display panel (20). The light receiving unit (330) can be in contact with the end of the optical fiber, and the emitted light received by the light receiving unit (330) can be transmitted through the optical fiber.

[0053] The light receiving unit (330) can move along the scan moving plane by the scan moving unit (320). Also, the current value measured by the photoelectric conversion element may vary depending on the position of the light receiving unit (330). That is, the amount of light received may vary depending on the position of the light receiving unit (330).

[0054] Additionally, the light receiving unit (330) may be located at multiple points on the scan moving plane. When the light receiving unit (330) is located at each of the multiple points, it may receive emitted light emitted from each of the multiple pixel groups. The multiple pixel groups may include different parts of the multiple pixels and correspond to each of the multiple points.

[0055] The light receiving unit (330) may not be able to receive the emitted light emitted from all of the multiple pixels at a single point. However, the light receiving unit (330) may be located at each of the multiple points and receive the emitted light emitted from each of the multiple pixel groups, thereby receiving the emitted light emitted from all of the multiple pixels. Accordingly, the display panel (20) can be scanned by the light receiving unit (330).

[0056] Multiple points may be arranged in a first scan direction and a second scan direction on a scan movement plane. The multiple points may be located at the intersection of multiple scanning rows that extend in the first scan direction and are arranged at a predetermined row interval in the second scan direction, and multiple scanning columns that extend in the second scan direction and are arranged at a predetermined column interval in the first scan direction. That is, the multiple points may be arranged along a grid pattern.

[0057] And, the light receiving unit (330) may be positioned at each of the multiple points located in the first scanning row among the multiple scanning rows, and then at each of the multiple points located in the second scanning row which is different from the first scanning row among the multiple scanning rows. In addition, while the light receiving unit (330) is positioned at each of the multiple points located in the first scanning row, it may move in the first scanning direction, and while it is positioned at each of the multiple points located in the second scanning row, it may move in the first scanning direction. That is, the light receiving unit (330) can perform a raster scan on the display panel (20).

[0058] Meanwhile, a plurality of scanning rows may include a first scanning row through an nth scanning row. n may be any natural number greater than 2. Also, the relationship between the kth scanning row and the k+1th scanning row may be the same as the relationship between the first scanning row and the second scanning row. k may be any natural number smaller than n.

[0059] The alignment unit (400) may include an alignment light transmitting unit (410) and an alignment light receiving unit (420). Due to the alignment unit (400), the panel support unit (220) and the scan moving unit (320) can be aligned. Then, the panel support unit (220) and the scan moving unit (320) are aligned so that the display panel (20) and the light receiving unit (330) can be aligned. For example, the exact center of the display panel (20) and the exact center of the light receiving unit (330) can be aligned.

[0060] The alignment light transmitter (410) may include a plurality of sub-alignment light transmitters (411, 412). In FIG. 1, two of the plurality of sub-alignment light transmitters (411, 412) are shown, but this may be only some of the plurality of sub-alignment light transmitters (411, 412). There may be three or more of the plurality of sub-alignment light transmitters (411, 412). The detailed configuration of the plurality of sub-alignment light transmitters (411, 412) will be described in more detail later through a separate drawing.

[0061] In FIG. 1, the alignment light transmitter (410) is positioned on the panel support (220), but the alignment light transmitter (410) may be positioned on either the panel support (220) or the scan moving unit (320). The alignment light transmitter (410) may emit alignment light. The alignment light may be light with strong directional properties. For example, it may be laser light. When the alignment light transmitter (410) is positioned on the panel support (220), the alignment light may be directed toward the scan moving unit (320). On the other hand, when the alignment light transmitter is positioned on the scan moving unit (320), the alignment light may be directed toward the panel support (220).

[0062] The alignment light receiver (420) may include a plurality of sub-alignment light receivers (421, 422). In FIG. 1, two of the plurality of sub-alignment light receivers (421, 422) are shown, but this may be only some of the plurality of sub-alignment light receivers (421, 422). There may be three or more of the plurality of sub-alignment light receivers (421, 422), and each of the plurality of sub-alignment light receivers (421, 422) may correspond one-to-one with a plurality of sub-alignment light transmitters (411, 412). The detailed configuration of the plurality of sub-alignment light receivers (421, 422) will be described in more detail later through a separate drawing.

[0063] In FIG. 1, the alignment light receiver (420) is positioned on the scan moving unit (320), but the alignment light receiver (420) may be positioned on either the panel support (220) or the scan moving unit (320) where the alignment light transmitter (410) is not positioned. The alignment light receiver (420) can receive alignment light. The alignment light receiver (420) may include a photoelectric converter. The photoelectric converter included in the alignment light receiver (420) may be a photodiode. And, when the alignment light receiver (420) receives alignment light, the panel support (220) and the scan moving unit (320) can be aligned. And, when the panel support (220) and the scan moving unit (320) are aligned, the display panel (20) and the light receiving unit (330) can be aligned. When the display panel (20) and the light receiving unit (330) are aligned, it can be confirmed that the light receiving unit (330) is positioned at a predetermined alignment position. A detailed method for aligning the panel support unit (220) and the scan moving unit (320) by the alignment unit (400) will be explained in more detail later through a separate drawing.

[0064] The lens placement section (500) may include a lens stand (510) and a lens support section (520). An optical lens (30) may be placed in the lens placement section (500). The optical lens (30) may emit or converge incident light.

[0065] The lens placement section (500) may be placed between the display placement section (200) and the scanning section (300). Accordingly, the optical lens (30) may be placed between the display panel (20) and the light receiving section (330). Therefore, the emitted light from the display panel (20) may diverge or converge at the optical lens (30) and reach the light receiving section (330).

[0066] The lens stand (510) can be placed on the distance adjustment unit (100). The lens stand (510) can be extended in a third direction (DR3).

[0067] The lens support (520) can be in contact with the lens stand (510). Also, the optical lens (30) can be placed on the lens support (520). The optical lens (30) placed on the lens support (520) can be fixed to the lens support (520).

[0068] The information processing unit (600) may include an information transmission unit (610), a control unit (620), and a control transmission unit (630). The information processing unit (600) may measure information about the light of the emitted light received from the light receiving unit (330).

[0069] The information transmission unit (610) can transmit a signal generated from the light receiving unit (330) to the control unit (620). The information transmission unit (610) may include a wire that electrically connects the photoelectric converter included in the light receiving unit (330) and the control unit (620). Accordingly, emitted light from the light receiving unit (330) is received and converted into electricity, and the electricity can travel along the information transmission unit (610) to the control unit (620).

[0070] The information transmission unit (610) may include an optical fiber connecting the light receiving unit (330) and the control unit (620). Accordingly, emitted light is received from the light receiving unit (330), and the emitted light can travel along the information transmission unit (610) to the control unit (620).

[0071] Additionally, the information transmission unit (610) can transmit a signal generated from the alignment light receiver (420) to the control unit (620). The information transmission unit (610) can transmit a signal generated when the alignment light receiver (420) receives alignment light to the control unit (620).

[0072] The control unit (620) can measure information about the light of the emitted light received from the light receiving unit (330) through the electricity transmitted through the wire of the information transmission unit (610). For example, the control unit (620) may include an ammeter for measuring current values. In addition, the control unit (620) can measure the amount of light of the emitted light received from the light receiving unit (330) through the current value of the electricity transmitted through the wire of the information transmission unit (610).

[0073] The control unit (620) can measure information about the light of the emitted light received at the light receiving unit (330) through the emitted light transmitted through the optical fiber of the information transmission unit (610). For example, the control unit (620) may include a spectrometer that separates the incident light by wavelength and measures information about the incident light by wavelength. The emitted light transmitted through the optical fiber of the information transmission unit (610) can be incident on the spectrometer and separated by wavelength. And the control unit (620) can measure the amount of light of the emitted light by wavelength.

[0074] The control unit (620) can measure information about the light of the emitted light through the current value of the transmitted electricity or the transmitted emitted light. If the control unit (620) measures information about the light of the emitted light through the current value of the transmitted electricity, it can measure information about the light of the emitted light received by the light receiving unit (330) more quickly, but it may not be able to measure the amount of light of the emitted light by wavelength. On the other hand, if the control unit (620) measures information about the light through the transmitted emitted light, it can measure the amount of light of the emitted light by wavelength, but it may take more time to measure information about the light of the emitted light.

[0075] The control unit (620) can receive a signal generated from the alignment light receiver (420) through the information transmission unit (610). Accordingly, when the alignment light receiver (420) receives the alignment light, the control unit (620) can confirm that the display panel (20) and the light receiving unit (330) are aligned, and can confirm that the light receiving unit (330) is located at the alignment position.

[0076] Meanwhile, information regarding the light of the emitted light received by the light receiving unit (330), which is measured by the control unit (620), may vary depending on the position of the light receiving unit (330). The control unit (620) can measure the light emission characteristics of the display panel (20) through the relationship between the position of the light receiving unit (330) and the information regarding the emitted light.

[0077] The light emission characteristics of the display panel (20) measured by the control unit (620) may be light coupling efficiency, diffusion angle, and steering angle. Detailed information regarding the light coupling efficiency, diffusion angle, and steering angle will be explained in more detail later through a separate drawing.

[0078] The control unit (620) can move the light receiving unit (330). For example, the control unit (620) can move the light receiving unit (330) through the distance adjustment unit (100) and the scan moving unit (320).

[0079] Additionally, the control unit (620) can measure information about the emitted light received by changing the position of the light receiving unit (330). When the light receiving unit (330) is located at a first point, the control unit (620) can move the light receiving unit (330) to a second point after measuring information about the emitted light received by the light receiving unit (330). And, when the light receiving unit (330) is located at a second point, the control unit (620) can measure information about the emitted light received by the light receiving unit (330).

[0080] Meanwhile, multiple points may include points 1 through n. n may be any natural number greater than 2. n may be equal to the number of multiple pixels included in the display panel (20). Also, the relationship between point k and point k+1 may be the same as the relationship between point 1 and point 2. k may be any natural number smaller than n.

[0081] Meanwhile, when the light receiving unit (330) is located at a first point, it can receive emitted light emitted from a first pixel group that includes some of the plurality of pixels. And, when the light receiving unit (330) is located at a second point, it can receive emitted light emitted from a second pixel group that is different from the first pixel group among the plurality of pixels.

[0082] Meanwhile, the plurality of pixel groups may include the first pixel group to the nth pixel group. n may be any natural number greater than 2. n may be equal to the number of plurality of pixels included in the display panel (20). Also, the relationship between the kth pixel group and the k+1th pixel group may be the same as the relationship between the first pixel group and the second pixel group. k may be any natural number smaller than n.

[0083] The control unit (620) can move the light receiving unit (330) from a first point to an nth point by repeatedly measuring information about the light of the emitted light received while changing the position of the light receiving unit (330). Through the above-described process, the light receiving unit (330) can receive the emitted light emitted from the first pixel group to the nth pixel group. Each of the plurality of pixels included in the display panel (20) can be included in at least one of the first pixel group to the nth pixel group. That is, the control unit (620) can measure information about the light of the emitted light emitted from all of the plurality of pixels of the display panel (20) through the light receiving unit (330) and can scan the display panel (20).

[0084] The control transmission unit (630) can transmit a signal generated from the control unit (620) to the distance adjustment unit (100), display placement unit (200), scan unit (300), and alignment unit (400), etc. By transmitting the signal through the control transmission unit (630), the distance adjustment unit (100), panel support unit (220), and scan movement unit (320) can move. Also, the position of the light receiving unit (330) can be changed by the control unit (620).

[0085] Additionally, while the distance adjustment unit (100), panel support unit (220), and scan moving unit (320) are moving, the alignment position can be determined by the alignment unit (400). Furthermore, multiple points can be defined through the relative positional difference with respect to the alignment position. That is, the alignment position can serve as a zero point in the positional relationship between the distance adjustment unit (100), panel support unit (220), and scan moving unit (320).

[0086] FIG. 2 is an exemplary front view of a display arrangement part (200) according to one embodiment of the present invention.

[0087] Referring to FIG. 2, the display placement unit (200) includes a panel fixing unit (230), and a panel placement surface (PDP) may be defined. In addition, a first sub-aligned light transmitter (411), a second sub-aligned light transmitter (412), a third sub-aligned light transmitter (413), and a fourth sub-aligned light transmitter (414) may be placed in the display placement unit (200).

[0088] The panel fixing part (230) may include a plurality of spring supports (231), a plurality of fixing springs (232), and a plurality of panel supports (233). The panel fixing part (230) may fix the display panel (20). And in FIG. 2, a plurality of pixels (21) included in the display panel (20) may be shown.

[0089] A plurality of spring supports (231) may be members fixed on the panel support (220). A plurality of spring supports (231) may be formed extending in a first direction (DR1) from the panel support (220).

[0090] One side of each of the plurality of fixed springs (232) may be in contact with each of the plurality of spring supports (231). The plurality of fixed springs (232) may be directed toward the center of the panel support (220).

[0091] Each of the plurality of panel supports (233) may come into contact with the other side of each of the plurality of fixed springs (232). The plurality of panel supports (233) may come into contact with the display panel (20).

[0092] A plurality of panel supports (233) are in contact with the display panel (20), a plurality of fixing springs (232) press the plurality of panel supports (233), and a plurality of spring supports (231) support the plurality of fixing springs (232), so that the display panel (20) can be fixed. In addition, the plurality of fixing springs (232) are each set to have the same elastic modulus so that the display panel (20) is not tilted to one side and can be positioned in the center of the panel support (220).

[0093] The configuration of the panel fixing part (230) is not limited to the above. The panel fixing part (230) can fix the display panel (20) by a method different from the method described above. Also, the position of the display panel (20) fixed to the panel fixing part (230) is not limited to the center of the panel support part (220). The display panel (20) fixed to the panel fixing part (230) can be fixed at a position offset to one side from the center of the panel support part (220).

[0094] A panel placement surface (PDP) on which a display panel (20) is placed may be defined in the panel support (220). A first sub-aligned light transmitter (411), a second sub-aligned light transmitter (412), a third sub-aligned light transmitter (413), and a fourth sub-aligned light transmitter (414) may be placed on the panel placement surface (PDP).

[0095] A plurality of sub-alignment light transmitters (411, 412, 413, and 414) can emit alignment light toward a first direction (DR1). Three or more of the plurality of sub-alignment light transmitters (411, 412, 413, and 414) may be arranged so that the panel support (220) and the scan moving part (320) can be aligned more accurately.

[0096] FIG. 3 is an exemplary front view of a scanning unit (300) according to one embodiment of the present invention.

[0097] Referring to FIG. 3, a light receiving surface (LRP) may be defined in the scanning unit (300). A first sub-aligned light receiving unit (421), a second sub-aligned light receiving unit (422), a third sub-aligned light receiving unit (423), and a fourth sub-aligned light receiving unit (424) may be disposed in the scanning unit (300).

[0098] In the scan moving unit (320), a light receiving surface (LRP) that receives light emitted from the display panel (20) may be defined. The light receiving surface (LRP) and the panel placement surface (PDP) may face each other. The light receiving surface (LRP) and the panel placement surface (PDP) may be positioned apart from each other, and the angle between the light receiving surface (LRP) and the panel placement surface (PDP) may be adjusted. Thus, the light receiving surface (LRP) and the panel placement surface (PDP) may be parallel to each other, and the extension of the light receiving surface (LRP) and the extension of the panel placement surface (PDP) may meet each other.

[0099] The light receiving plane (LRP) and the scan moving plane may have different configurations. In FIG. 3, the light receiving plane (LRP) may appear identical to the scan moving plane as a plane defined by the second direction (DR2) and the third direction (DR3). However, the angle between the light receiving plane (LRP) and the panel placement plane (PDP) may be adjusted so that the light receiving plane (LRP) is not defined as a plane defined by the second direction (DR2) and the third direction (DR3). Meanwhile, the scan moving plane may be set as a plane defined by the second direction (DR2) and the third direction (DR3). Therefore, the light receiving plane (LRP) and the scan moving plane may have separate configurations.

[0100] A first sub-aligned light receiver (421), a second sub-aligned light receiver (422), a third sub-aligned light receiver (423), and a fourth sub-aligned light receiver (424) may be disposed on the light receiving surface (LRP).

[0101] A plurality of sub-alignment light receivers (421, 422, 423, and 424) can receive alignment light. Three or more of the plurality of sub-alignment light receivers (421, 422, 423, and 424) may be arranged so that the panel support (220) and the scan moving part (320) can be aligned more accurately.

[0102] FIG. 4 is a side view illustrating the path of the alignment light (AL) in an exemplary manner, illustrating the display placement unit (200), the scanning unit (300), and the alignment unit (400) according to one embodiment of the present invention.

[0103] Referring to FIG. 4, alignment light (AL) can be emitted from the alignment light transmitter (410) and the alignment light (AL) can be received from the alignment light receiver (420). Also, the light receiving surface (LRP) and the panel placement surface (PDP) can be parallel to each other.

[0104] Although FIG. 4 is illustrated as if the alignment light transmitter (410) includes only the first sub-alignment light transmitter (411) and the second sub-alignment light transmitter (412), this is because it is a side view, so the alignment light transmitter (410) may include three or more multiple sub-alignment light transmitters (411, 412, 413, and 414) as in FIG. 2. The alignment light receiver (420) may also include three or more multiple sub-alignment light receivers (421, 422, 423, and 424) as in FIG. 3.

[0105] Alignment light (AL) is received at each of the plurality of sub-alignment light receivers (421, 422, 423, and 424), and the amount of light of the alignment light (AL) can be measured. If the difference in the amount of light of the alignment light (AL) measured at each of the plurality of sub-alignment light receivers (421, 422, 423, and 424) is within a predetermined error range, it can be confirmed that the panel support (220) and the scan moving unit (320) are aligned with each other. And it can be confirmed that the position of the light receiving unit (330) is located at the alignment position.

[0106] Each of the alignment light (AL) emitted from each of the multiple sub-alignment light transmitters (411, 412, 413, and 414) can be parallel to each other. Thus, the panel support (220) and the scan moving part (320) can be aligned in the second direction (DR2) and the third direction (DR3) regardless of the distance between them.

[0107] Meanwhile, although not shown in FIG. 4, each of the alignment light (AL) emitted from each of the plurality of sub-alignment light transmitters (411, 412, 413, and 414) may be in a position that intersects or twists with one another. For example, the alignment light (AL) emitted from the first sub-alignment light transmitter (411) may be received at the second sub-alignment light receiver (422), and the alignment light (AL) emitted from the second sub-alignment light transmitter (412) may be received at the first sub-alignment light receiver (421).

[0108] Therefore, depending on the distance between the panel support (220) and the scan moving part (320), a plurality of sub-alignment light receiving parts (421, 422, 423, and 424) may not receive the alignment light (AL). As a result, the panel support (220) and the scan moving part (320) may be aligned in a first direction (DR1), a second direction (DR2), and a third direction (DR3).

[0109] FIGS. 5A and 5B illustrate the path of the alignment light (AL) in a side view illustrating, in an exemplary manner, a display placement unit (200), a scanning unit (300), and an alignment unit (400) according to an embodiment of the present invention.

[0110] Referring to FIGS. 5a and 5b, alignment light (AL) is emitted from the alignment light transmitter (410), and alignment light (AL) can be received in a part of the alignment light receiver (420). Also, the light receiving surface (LRP) and the panel placement surface (PDP) may not be parallel to each other.

[0111] In FIGS. 5A and 5B, the alignment light transmitter (410) may include three or more sub-alignment light transmitters (411, 412, 413, and 414) as in FIG. 2. The alignment light receiver (420) may also include three or more sub-alignment light receivers (421, 422, 423, and 424) as in FIG. 3.

[0112] When the light receiving surface (LRP) and the panel placement surface (PDP) are not parallel to each other, alignment light (AL) is received at each of the multiple sub-alignment light receiving units (421, 422, 423, and 424), and it may be impossible for the difference in the amount of light of the measured alignment light (AL) to be within a predetermined error range.

[0113] Accordingly, when alignment light (AL) is received at a corresponding sub-alignment light transmitter (411, 412, 413, or 414) among a plurality of sub-alignment light transmitters (411, 412, 413, and 414) at each of the plurality of sub-alignment light receivers (421, 422, 423, and 424), each of the positions of the light receiver (330) can be identified as a plurality of sub-alignment positions. And an alignment position can be derived through the plurality of sub-alignment positions. For example, an alignment position can be derived as the center of the plurality of sub-alignment positions.

[0114] For example, in FIG. 5a, the alignment light (AL) emitted from the first sub-alignment light transmitter (411) is received at the first sub-alignment light receiver (421), and the alignment light (AL) emitted from the third sub-alignment light transmitter (413) is received at the third sub-alignment light receiver (423), so that the position of the receiving unit (330) can be confirmed as the first sub-alignment position and the third sub-alignment position.

[0115] In addition, in FIG. 5b, the alignment light (AL) emitted from the second sub-alignment light transmitter (412) is received at the second sub-alignment light receiver (422), and the alignment light (AL) emitted from the fourth sub-alignment light transmitter (414) is received at the fourth sub-alignment light receiver (424), so that the position of the receiving unit (330) can be confirmed as the second sub-alignment position and the fourth sub-alignment position.

[0116] And, an alignment position can be derived through the first sub-alignment position, the second sub-alignment position, the third sub-alignment position, and the fourth sub-alignment position. For example, an alignment position can be derived at the center of the first to fourth sub-alignment positions.

[0117] FIG. 6 is a side view illustrating, in which the path of the emitted light (EL), the scan moving plane (LSP), and the coupling range (LCA) are illustrated in an exemplary manner, in a display placement section (200) and a scan section (300) according to one embodiment of the present invention.

[0118] Referring to FIG. 6, an emitted light (EL) can be emitted from the display panel (20). The emitted light (EL) can be directed toward the scan moving plane (LSP). Additionally, some of the emitted light (EL) can be directed toward the coupling range (LCA). Through FIG. 6, the light coupling efficiency can be measured by the light emission characteristics of the display panel (20).

[0119] The light coupling efficiency may refer to the ratio of light incident within a predetermined coupling range (LCA) among the emitted light (EL) emitted from each of the display panel (20), the plurality of pixels (21), or the light-emitting group including a portion of the plurality of pixels (21) that emits light.

[0120] The combined area (LCA) can be defined through a predetermined shape defined on the scan moving plane (LSP). The combined area (LCA) can be defined as a circle, ellipse, or polygon, etc., defined on the scan moving plane (LSP). Additionally, the combined area may be a shape formed by multiplying the shape of the display panel (20) by a predetermined magnification factor. For example, if the display panel (20) is a rectangular shape with an aspect ratio of 16:9 and a diagonal length of 2 inches, the combined area may be a rectangular shape with an aspect ratio of 16:9 and a diagonal length of 1 inch formed by multiplying the shape of the display panel (20) by 50%.

[0121] Meanwhile, the coupling range can be defined as the shape of the light projected onto the scan moving surface (LSP) by the emission light (EL) having a predetermined emission angle. For example, if the emission angle of the emission light (EL) emitted from the display panel (20) is 10 degrees or less, it can be defined as the shape of the light projected onto the scan moving surface (LSP). For example, if the display panel (20) has a rectangular shape, the coupling range may be a rectangular shape that is larger than the display panel (20) and has rounded corners.

[0122] The optical coupling efficiency can be measured through the ratio of the amount of emitted light (EL) received while the receiving unit (330) is located within the coupling range (LCA) to the amount of light received while the receiving unit (330) is located on the scan moving plane (LSP).

[0123] In addition, the optical coupling efficiency is measured, and the ratio of light input into the optical system of the head-mount device among the emitted light from the display panel (20) placed in the head-mount device can be determined. The positional relationship between the display panel (20) fixed to the panel support (220) and the coupling range (LCA) can be set to be the same as the positional relationship between the display panel and the optical system included in the predetermined head-mount device. Accordingly, the optical coupling efficiency of the display panel (20) is measured through the light emission characteristic measurement system (1) of the display panel, and when the display panel (20) is included in the head-mount device, the ratio of light input into the optical system among the emitted light from the display panel (20) can be determined.

[0124] Meanwhile, a metasurface is applied to the display panel (20) so that the optical coupling efficiency can be adjusted. Additionally, although not shown in FIG. 6, an optical lens (30) may be further arranged so that the optical coupling efficiency when the optical lens (30) is arranged can be measured.

[0125] FIG. 7 is a side view illustrating, in which the path, emission direction (ED), and diffusion angle (DFA) of the emitted light (EL) are illustrated in an exemplary manner, in which a display arrangement unit (200) and a scan unit (300) according to one embodiment of the present invention are illustrated in an exemplary manner.

[0126] Referring to FIG. 7, an emitted light (EL) can be emitted from a display panel (20). The emitted light (EL) can be emitted in an emission direction (ED). The emitted light (EL) may include a central light (CEL) and an outer light (OEL). Also, the angle between the emission direction (ED) and the generatrix or edge of the central light (CEL) can be defined as the diffusion angle (DFA).

[0127] The emission direction (ED) may be the direction in which the emitted light (EL) is emitted from each of the display panel (20), the plurality of pixels (21), or the light-emitting group including a portion of the plurality of pixels (21) that emit light. The emission direction (ED) may be measured through the direction in which the amount of emitted light (EL) is highest or through the average of the directions in which the emitted light (EL) is emitted.

[0128] The central light (CEL) may be a conical, polygonal pyramidal, truncated cone, or truncated polygonal light centered on the emission direction (ED). The emitted light emitted from a substantially point-like light source, i.e., each of the plurality of pixels (21), may have a conical or truncated polygonal central light (CEL), and the emitted light emitted from a substantially plane-like light source, i.e., a light source group including a portion of the display panel (20) or the plurality of pixels (21) that emits light, may have a truncated cone or truncated polygonal central light (CEL). In FIG. 7, a conical central light (CEL) emitted from a substantially point-like light source may be illustrated.

[0129] The central light (CEL) may include light of a predetermined diffusion ratio among the emitted light (EL). For example, the diffusion ratio may be set to 70%. And, a portion of the emitted light (EL) may be defined as the central light (CEL) centered on the emission direction (ED).

[0130] The outer light (OEL) can be the remaining portion of the emitted light (EL) excluding the central light (CEL).

[0131] The diffuse angle (DFA) can be defined as the angle between the emission direction (ED) and the generatrix or edge of the central light (CEL). In Fig. 7, it can be defined as the angle between the emission direction (ED) and the generatrix of the conical central light (CEL). The diffuse angle (DFA) may be small when the emitted light (EL) is concentrated around the emission direction (ED). On the other hand, the diffuse angle (DFA) may be large when the emitted light (EL) is not concentrated around the emission direction (ED).

[0132] Additionally, the diffusion angle (DFA) is measured, and the light efficiency of the display panel (20) included in the head-mounted device can be determined. When the display panel (20) is mounted on the head-mounted device, the positional relationship between the display panel (20) and the user's eyeball may be substantially fixed. Therefore, if the display panel (20) emits a relatively large amount of light in the narrow area where the user's eyeball is located, that is, if the diffusion angle (DFA) is narrow, the amount of light emitted from the display panel (20) and received by the user's eyeball may be relatively large. Consequently, the light efficiency of the display panel (20) may be increased. On the other hand, if the diffusion angle (DFA) is narrow, the amount of light emitted from the display panel (20) and received by the user's eyeball may be relatively small. Consequently, the light efficiency of the display panel (20) may be lowered.

[0133] In some cases, the diffusion angle (DFA) may be negative. For example, when the emitted light (EL) is emitted by emitting light from the entire display panel (20), the emitted light (EL) may converge. Also, the shape of the central light (CEL) may be set to a truncated cone or truncated polygonal shape that gradually narrows as it progresses in the emission direction (ED). In such cases, the diffusion angle (DFA) may be negative, which is the value obtained by multiplying the angle between the emission direction (ED) and the generatrix or edge of the central light (CEL) by -1.

[0134] Meanwhile, a metasurface is applied to the display panel (20) so that the diffusion angle (DFA) can be adjusted. Additionally, although not shown in FIG. 7, an optical lens (30) may be further arranged so that the diffusion angle (DFA) when the optical lens (30) is arranged can be measured.

[0135] FIG. 8 is a side view illustrating, in which the path, emission direction (ED), vertical direction (PD), and steering angle (STA) of the emitted light (EL) are illustrated in an exemplary manner, in which a display arrangement unit (200) and a scan unit (300) according to one embodiment of the present invention are illustrated in an exemplary manner.

[0136] Referring to FIG. 8, an emitted light (EL) may be emitted from a display panel (20). The emitted light (EL) may be emitted in an emission direction (ED). And a direction perpendicular to the display panel (20) may be defined as a vertical direction (PD). The angle between the emission direction (ED) and the vertical direction (PD) may be defined as a steering angle (STA).

[0137] The vertical direction (PD) may be a direction perpendicular to each of the display panel (20) and the plurality of pixels (21), or to a light-emitting group including a portion of the plurality of pixels (21) that emit light. If the display panel (20) is flat, the vertical direction (PD) may be a direction perpendicular to the display panel (20) regardless of the light-emitting object. If the display panel (20) includes a curved surface, the vertical direction (PD) may be measured by summing the directions perpendicular to the light-emitting objects on the display panel (20) or by averaging the directions perpendicular to the light-emitting objects on the display panel (20).

[0138] The vertical direction (PD) can be defined through the positional relationship between the panel support (220) and the scan moving part (320). In the present invention, the display placement part (200) and the scan part (300) can be aligned with each other by the alignment part (400) in a manner such as that shown in FIG. 4, FIG. 5a, and FIG. 5b. Thus, the relative position between the display panel (20) and the light receiving part (330) can be defined more accurately. Thus, the vertical direction (PD) can be defined more accurately.

[0139] The steering angle (STA) can be defined as the angle between the release direction (ED) and the vertical direction (PD). The steering angle (STA) can be measured by measuring the release direction (ED) and defining the vertical direction (PD). Furthermore, the steering angle (STA) may be configured to include not only the angle between the release direction (ED) and the vertical direction (PD) but also the steering direction. During the process of measuring the steering angle (STA), the steering direction is measured, so the steering angle (STA) can be measured separately as the second direction (DR2) steering angle (STA) and the third direction (DR3) steering angle (STA), and the second direction (DR2) steering angle (STA) and the third direction (DR3) steering angle (STA) may have negative values ​​depending on the direction.

[0140] Each of the multiple pixels (21) within the display panel (20) may have a different steering angle (STA). For example, the multiple pixels (21) in the center of the display panel (20) may have a steering angle of 0 degrees and emit light forward. Meanwhile, as shown in FIG. 8, the multiple pixels (21) at the bottom of the display panel (20) may have a steering angle (STA) and emit light in a direction deviated to one side. In particular, light may be emitted in a direction deviated toward the center of the display panel (20). Therefore, the emitted light emitted from the display panel (20) can converge. Consequently, the light coupling efficiency of the display panel (20) can be increased.

[0141] Each of the multiple pixels (21) within the display panel (20) may have the same steering angle (STA). Therefore, in the display panel (20) included in the head-mounted device, emitted light (EL) can be emitted in the emission direction (ED) without a separate optical component. Consequently, the structure of the head-mounted device may be simplified, the weight reduced, or the volume reduced. Therefore, the steering angle (STA) of the display panel (20) may be measured, and the design of the head-mounted device may be modified. Furthermore, the steering angle (STA) of the display panel (20) may be measured, and it may be determined whether the display panel (20) can be applied to the designed head-mounted device.

[0142] Meanwhile, a metasurface is applied to the display panel (20) so that the steering angle (STA) can be adjusted. Additionally, although not shown in FIG. 8, an optical lens (30) may be further arranged so that the steering angle (STA) when the optical lens (30) is arranged can be measured.

[0143] FIG. 9 is an exemplary flowchart illustrating a method of driving a light emission characteristic measurement system according to one embodiment of the present invention.

[0144] Referring to FIG. 9, a driving method of a light emission characteristic measurement system according to one embodiment of the present invention may include a panel placement step (S100), a lens placement step (S200), an alignment step (S300), an emission step (S400), a light reception step (S500), a measurement step (S600), a movement step (S700), and an analysis step (S800).

[0145] In the panel placement step (S100), a display panel (20) including a plurality of pixels (21) that emit light can be placed on a panel support (220). The display panel (20) can be fixed by a panel fixing part (230).

[0146] In the lens placement step (S200), an optical lens (30) that diverges or converges light incident on the lens support (520) may be placed. The lens placement step (S200) may be omitted. Therefore, other steps may be performed without the optical lens (30) being placed.

[0147] In the alignment step (S300), the panel support member (220) and the scan moving member (320) can be aligned by the alignment member (400). Furthermore, the display panel (20) and the light receiving member (330) can be aligned.

[0148] In the emission step (S400), light may be emitted from the display panel (20) placed on the panel support (220). The emission step (S400) may be continued. Thus, light may be continuously emitted from the display panel (20) while other steps are performed.

[0149] In the light receiving step (S500), emitted light can be received from the light receiving unit (330). Specifically, the light receiving unit (330) located at any one of a plurality of points may include different parts of a plurality of pixels (21), and emitted light emitted from any one of a plurality of pixel groups corresponding to each of the plurality of points may be received.

[0150] In the measurement step (S600), information regarding the light received from the light receiving unit (330) can be measured. Specifically, the amount of light received and the amount of light received by wavelength can be measured by the control unit (620).

[0151] In the movement step (S700), the position of the light receiving unit (330) can be changed to any one of a plurality of points. The light receiving unit (330) is moved by the scan movement unit (320), so that the position of the light receiving unit (330) can be changed to any one of a plurality of points.

[0152] The light reception step (S500), the measurement step (S600), and the movement step (S700) can be repeated multiple times. Accordingly, the light reception unit (330) can repeatedly receive emitted light while changing its position, and information about the received light can be measured.

[0153] For example, in the light receiving step (S500), when the light receiving unit (330) is located at a first point among a plurality of points, the emitted light emitted from the first pixel group among a plurality of pixel groups is received, and after information about the received light is measured in the measurement step (S600), the light receiving unit (330) can be moved to a second point different from the first point among a plurality of points in the movement step (S700).

[0154] Then, the light reception step (S500) is performed again so that emitted light from a second pixel group different from the first pixel group among the plurality of pixel groups is received, and after information about the received light is measured in the measurement step (S600), the position of the light receiving unit (330) can be moved in the movement step (S700). The above-described process is repeated so that the display panel (20) can be scanned.

[0155] In the analysis step (S800), the light emission characteristics of the display panel (20) can be measured through information about the received light. The light emission characteristics of the display panel (20) may include at least one of light coupling efficiency, diffusion angle, and steering angle.

[0156] FIG. 10 is an exemplary front view of a scanning unit (300-1) according to one embodiment of the present invention.

[0157] Referring to FIG. 10, the scanning unit (300-1) includes a light receiving unit (330-1), and the light receiving unit (330-1) may include a first sub-light receiving unit (331) and a second sub-light receiving unit (332). Also, the light receiving surface (LRP) may be defined, and the first to eighth sub-aligned light receiving units (421 to 428) may be disposed therein.

[0158] The first sub-light receiving unit (331) may be identical to the light receiving unit (330) of FIG. 1 that includes a photoelectric conversion element. Since the first sub-light receiving unit (331) includes a photoelectric conversion element that receives emitted light and converts it into electricity, the emitted light received at the first sub-light receiving unit (331) can be converted into electricity and transmitted through a wire.

[0159] The second sub-light receiving unit (332) may be identical to the light receiving unit (330) of FIG. 1 that is in contact with the end of the optical fiber. The second sub-light receiving unit (332) is spaced apart from the first sub-light receiving unit (331) and can receive and transmit the emitted light emitted from the display panel (20). Since the second sub-light receiving unit (332) is in contact with the end of the optical fiber, the emitted light received from the second sub-light receiving unit (332) can be transmitted through the optical fiber.

[0160] Accordingly, electricity generated in the first sub-light receiving unit (331) can be transmitted to the control unit (620) by the light receiving unit (330-1), or emitted light can be transmitted to the control unit (620) through the second sub-light receiving unit (332).

[0161] Meanwhile, when electricity is delivered to the control unit (620), the control unit (620) can measure information about the light of the emitted light more quickly. And when the emitted light is delivered to the control unit (620), the control unit (620) can measure the amount of light of the emitted light by wavelength. Also, electricity or emitted light can be selectively delivered to the control unit (620).

[0162] When the panel support (220) and the scan moving part (320) are aligned through the first to fourth sub-alignment light receiving parts (421, 422, 423, and 424), the display panel (20) and the first sub-light receiving part (331) can be aligned. Accordingly, electricity can be delivered to the control part (620).

[0163] And, when the panel support (220) and the scan moving unit (320) are aligned through the 5th to 8th sub-alignment light receiving units (425, 426, 427, and 428), the display panel (20) and the 2nd sub-light receiving unit (332) can be aligned. Accordingly, the emitted light can be transmitted to the control unit (620).

[0164] FIG. 11 is an exemplary front view of a scanning unit (300-2) according to one embodiment of the present invention.

[0165] Referring to FIG. 11, the scanning unit (300-2) includes a light receiving unit (330-2), and the light receiving unit (330-2) may include a plurality of sub-light receiving units (333).

[0166] Each of the plurality of sub-light receiving units (333) may have the same configuration as the light receiving unit (330) of FIG. 1. The plurality of sub-light receiving units (333) may be placed at different locations. The plurality of sub-light receiving units (333) may be arranged on a light receiving surface (LRP).

[0167] For example, the spacing between multiple sub-light receiving units (333) may be the same as the spacing between multiple points described above, or an integer multiple of the spacing between multiple points described above. Accordingly, while the light receiving unit (330-2) is located at one point, multiple sub-light receiving units (333) may be located at multiple points. Therefore, the movement of the light receiving unit (330) can be minimized while the display panel (20) is scanned by the light receiving unit (330-2). Accordingly, errors, etc., caused by operational abnormalities of the scan moving unit (320) can be minimized.

[0168] Additionally, electricity or emitted light can be transmitted to the control unit (620) by each of the plurality of sub-light receiving units (333). The control unit (620) can measure information regarding the emitted light received from the plurality of sub-light receiving units (333). Furthermore, the control unit (620) can measure the light emission characteristics of the display panel (20) through the relationship between the location of each of the plurality of sub-light receiving units (333) and the information regarding the emitted light.

[0169] FIG. 12 is a side view illustrating the path of the alignment light (AL) in an exemplary manner, illustrating the display placement unit (200), the scanning unit (300), and the alignment unit (400-1) according to one embodiment of the present invention.

[0170] Referring to FIG. 12, the alignment light transmitter (410-1) may further include a fifth sub-alignment light transmitter (415). And by the fifth sub-alignment light transmitter (415), the panel support (220) and the scan moving unit (320) can be aligned with each other at once even when the light receiving surface (LRP) and the panel placement surface (PDP) are not parallel to each other.

[0171] Alignment light (AL) emitted from the first sub-alignment light transmitter (411) can be received at the first sub-alignment light receiver (421), and alignment light (AL) emitted from the fifth sub-alignment light transmitter (415) can be received at the second sub-alignment light receiver (422). Therefore, even if the light receiving surface (LRP) and the panel placement surface (PDP) are not parallel to each other, the panel support (220) and the scan moving unit (320) can be aligned with each other at once.

[0172] Accordingly, the alignment light transmitter (410-1) additionally includes a fifth sub-alignment light transmitter (415), so that the alignment process of the panel support (220) and the scan moving unit (320) can be facilitated when the light receiving surface (LRP) and the panel placement surface (PDP) are not parallel to each other.

[0173] Meanwhile, the configuration in which the alignment light transmitter (410-1) includes an additional sub-alignment light transmitter is not limited thereto. The alignment light transmitter (410-1) may further include a sixth sub-alignment light transmitter (not shown), etc., so that the panel support (220) and the scan moving unit (320) can be aligned with each other at once even when the angle between the light receiving surface (LRP) and the panel placement surface (PDP) is different from the angle in FIG. 12.

[0174] Additionally, the alignment light transmitter (410-1) can cause the fifth sub-alignment light transmitter (415) to move along the third direction (DR3). Thus, even when the angle between the light receiving surface (LRP) and the panel placement surface (PDP) changes, the panel support (220) and the scan moving unit (320) can be aligned with each other at once.

[0175] And, the alignment light transmitter (410-1) can cause the second sub-alignment light transmitter (412) to move along the third direction (DR3). Thus, the second sub-alignment light transmitter (412) can perform the role of the fifth sub-alignment light transmitter (415) in FIG. 12.

[0176] FIG. 13 illustrates an exemplary front view of a display placement unit (200) according to an embodiment of the present invention. FIG. 14 illustrates an exemplary front view of a scanning unit (300) according to an embodiment of the present invention. FIG. 15 illustrates an exemplary path of alignment light (AL) in a side view illustrating the display placement unit (200), scanning unit (300), and alignment unit (400-2) according to an embodiment of the present invention.

[0177] Referring to FIGS. 13, 14, and 15, the alignment unit (400-2) may include an alignment light guide (430). Additionally, the alignment light transmitter (410-2) may be positioned on a panel placement surface (PDP), and the alignment light receiver (420-2) may be positioned on a light receiving surface (LRP).

[0178] The alignment light transmitter (410-2) may have the same configuration as any one of the plurality of sub-alignment light transmitters (411, 412, 413, and 414) of FIG. 2. And, the alignment light transmitter (410-2) may emit alignment light in a direction perpendicular to the panel placement surface (PDP), i.e., a first direction (DR1).

[0179] The alignment light receiver (420-2) may have the same configuration as any one of the plurality of sub-alignment light receivers (421, 422, 423, and 424) of FIG. 3.

[0180] The alignment light guide (430) is positioned on the light receiving surface (LRP) and can surround the alignment light receiver (420-2) and extend in a direction perpendicular to the light receiving surface (LRP). That is, the alignment light guide (430) can extend in a first direction (DR1). And, the alignment light guide (430) can block the alignment light (AL).

[0181] Therefore, if the light receiving surface (LRP) and the panel placement surface (PDP) are not parallel to each other, the alignment light (AL) emitted from the alignment light transmitting unit (410-2) can be blocked by the alignment light guide (430).

[0182] Therefore, when alignment light is received at the alignment light receiver (420-2), it can be confirmed that the light receiving surface (LRP) and the panel placement surface (PDP) are parallel to each other, and that the alignment light transmitter (410-2) and the alignment light receiver (420-2) are located in a straight line. Thus, the panel support (220) and the scan moving unit (320) can be aligned.

[0183] Therefore, when the alignment unit (400-2) includes an alignment light guide (430), the panel support unit (220) and the scan moving unit (320) can also be aligned through a single alignment light transmitter (410-2) and a single alignment light receiver (420-2).

[0184] Although the invention has been described with reference to exemplary embodiments, those skilled in the art will understand that various modifications and changes can be made to the invention without departing from the spirit and scope of the invention as set forth in the following claims. Furthermore, the exemplary embodiments disclosed in the invention are not intended to limit the technical spirit of the invention, and all technical spirits within the scope of the following claims and their equivalents should be interpreted as being included within the scope of the rights of the invention. Explanation of the symbols

[0185] 1: Light emission measurement system of a display panel 10: Measuring device 20: Display panel 30: Optical lens 100: Distance adjustment section 200: Display placement section 210: Display stand 220: Panel support 230: Panel fixing part 231: Spring support 232: Fixed spring 233: Panel support 300: Scan unit 310: Scan stand 320: Scan moving unit 330: Light receiving unit 400: Alignment unit 410: Alignment light transmitter 420: Alignment light receiver 500: Lens placement unit 510: Lens stand 520: Lens support 600: Information Processing Unit 610: Information Transmission Unit 620: Control unit 630: Control transmission unit

Claims

Claim 1 A display panel support member defining a panel placement surface on which a display panel is placed, and a panel fixing member fixing the display panel, wherein the display panel includes a plurality of pixels that emit light; a scan moving member spaced apart from the panel support member and having a light receiving surface defined facing the panel placement surface, and a light receiving member disposed on the light receiving surface and receiving the emitted light, wherein the scan moving member includes a scan unit that moves the light receiving member; a control unit that measures information regarding light received by the light receiving member and measures the light emission characteristics of the display panel through the information regarding the received light; and an alignment light transmitting member disposed on either the panel support member or the scan moving member and emitting alignment light.The apparatus includes an alignment light receiver disposed on either one of the panel support and the scan moving unit where the alignment light transmitter is not disposed, and which receives the alignment light; the receiving unit may be located at a plurality of points, and the receiving unit receives emitted light emitted from a first pixel among a plurality of pixels at a first point among the plurality of points, and the receiving unit receives emitted light emitted from a second pixel among a plurality of pixels that is different from the first pixel at a second point among the plurality of points that is different from the first point, and the plurality of points are located on a predetermined scan moving surface, and the plurality of points are arranged in a first scan direction and a second scan direction that intersects the first scan direction, and the plurality of points are located at a point where a plurality of scanning rows extending in the first scan direction and arranged at a predetermined row interval in the second scan direction and a plurality of scanning columns extending in the second scan direction and arranged at a predetermined column interval in the first scan direction intersect, and the receiving unit is located at the plurality of scanning rows located in the first scanning row among the plurality of scanning rows. A light emission characteristic measurement system for a display panel, wherein, after being located at each of the points, it is located at each of the multiple points that are located in a second scanning row different from the first scanning row among the multiple scanning rows, and when the alignment light receiver receives the alignment light, the position of the light receiver is confirmed as a predetermined alignment position. Claim 2 delete Claim 3 delete Claim 4 A light emission characteristic measurement system of a display panel, wherein the light receiving unit includes a photoelectric converter that receives the emitted light and converts it into electricity, and the control unit measures the amount of light received through a current value measured by the light receiving unit. Claim 5 In claim 4, a system for measuring the light emission characteristics of a display panel, wherein the size of the photoelectric conversion element is 50 nm or more and 1,000 μm or less. Claim 6 A light emission characteristic measurement system for a display panel according to claim 4, further comprising a spectrometer that separates incident light by wavelength, wherein the light receiving unit includes a first sub-light receiving unit and a second sub-light receiving unit spaced apart from the first sub-light receiving unit, wherein the first sub-light receiving unit includes the photoelectric conversion element, and the control unit measures the amount of light of emitted light received from the first sub-light receiving unit through a current value measured from the first sub-light receiving unit, and measures the light emission characteristics of the display panel through the relationship between the position of the first sub-light receiving unit and the amount of light of the emitted light, wherein the emitted light received from the second sub-light receiving unit is incident on the spectrometer, and the spectrometer separates the emitted light by wavelength, and the control unit measures the amount of light of the emitted light received from the second sub-light receiving unit by wavelength, and measures the light emission characteristics of the display panel by wavelength through the relationship between the position of the second sub-light receiving unit and the amount of light of the emitted light. Claim 7 A light emission characteristic measurement system for a display panel according to claim 1, further comprising a spectrometer that separates incident light by wavelength, wherein the emitted light received from the light receiving unit is incident on the spectrometer, the spectrometer separates the emitted light by wavelength, the control unit measures the amount of the emitted light received from the light receiving unit by wavelength, and measures the light emission characteristics of the display panel by wavelength through the relationship between the position of the light receiving unit and the amount of the emitted light. Claim 8 A light emission characteristic measurement system of a display panel according to claim 1, wherein the light receiving unit is positioned at different locations and includes a plurality of sub-light receiving units that receive the emitted light, the plurality of sub-light receiving units are arranged on the light receiving surface, and the control unit measures the amount of light of the emitted light received from the plurality of sub-light receiving units and measures the light emission characteristic of the display panel through the relationship between the position of each of the plurality of sub-light receiving units and the amount of light of the emitted light. Claim 9 delete Claim 10 A light emission characteristic measurement system of a display panel according to claim 1, wherein the alignment light transmitter comprises three or more sub-alignment light transmitters that emit the alignment light, and the alignment light receiver comprises a plurality of sub-light receivers each corresponding to the sub-alignment light transmitters, and each of the plurality of sub-light receivers receives the alignment light from a corresponding sub-alignment light transmitter among the plurality of sub-alignment light transmitters, and each of the plurality of sub-alignment light receivers measures the amount of light of the received alignment light, and when the difference between the amount of light of the alignment light measured at each of the plurality of sub-alignment light receivers is within a predetermined error range, the position of the light receiver is confirmed as the alignment position. Claim 11 A light emission characteristic measurement system of a display panel according to claim 1, wherein the alignment light transmitter comprises three or more sub-alignment light transmitters that emit the alignment light, and the alignment light receiver comprises a plurality of sub-receiving units each corresponding to the sub-alignment light transmitters, and each of the plurality of sub-receiving units receives the alignment light from a corresponding sub-alignment light transmitter among the plurality of sub-alignment light transmitters, and when each of the plurality of sub-alignment light receiving units receives the alignment light, each of the positions of the receiving unit is identified as a plurality of sub-alignment positions, and the alignment position is identified from the plurality of sub-alignment positions. Claim 12 A light emission characteristic measurement system of a display panel in which the direction in which the panel arrangement surface and the light receiving surface face, and the angle between the panel arrangement surface and the light receiving surface are adjusted in claim 1. Claim 13 A light emission characteristic measurement system of a display panel according to claim 1, further comprising an optical lens that emits or converges incident light and a lens placement portion located between the panel support portion and the scanning portion. Claim 14 A system for measuring the light emission characteristics of a display panel, wherein, in claim 1, a predetermined area on the scan moving surface is defined as a coupling range, some of the plurality of points are located within the coupling range, the light emission characteristic of the display panel measured by the control unit is a light coupling efficiency, and the light coupling efficiency is the ratio of the amount of emitted light received while the light receiving unit is located within the coupling range to the amount of emitted light received while the light receiving unit is located at each of the plurality of points. Claim 15 In claim 1, the emitted light emitted from each of the plurality of pixels or from a light-emitting group including a portion of the plurality of pixels that emits light may be emitted in a predetermined emission direction, and among the emitted light emitted from each of the plurality of pixels or from the light-emitting group, a cone, polygonal pyramid, frustum of a cone, or frustum of a polygonal pyramid centered on the emission direction may be defined as a central light, and the central light includes light of a predetermined diffusion ratio among the emitted light emitted from each of the plurality of pixels, and the angle between the generatrix or edge of the central light and the emission direction is defined as a diffusion angle, and the light emission characteristic of the display panel measured by the control unit is a diffusion angle, and while the light-receiving unit is located at each of the plurality of points, the emission direction and the position of the central light are measured through information regarding the light received by the light-receiving unit, and the diffusion angle is measured through the emission direction and the position of the central light, in a light emission characteristic measurement system. Claim 16 A light emission characteristic measurement system according to claim 1, wherein the emitted light emitted from each of the plurality of pixels or a light-emitting group including a portion of the plurality of pixels that emits light can be emitted in a predetermined emission direction, the angle between a direction perpendicular to the display panel and the emission direction is defined as a steering angle, the light emission characteristic of the display panel measured by the control unit is the steering angle, the emission direction is measured through information about the light received by the light receiving unit while the light receiving unit is located at each of the plurality of points, and the steering angle is measured through the emission direction. Claim 17 A panel placement step in which a display panel including a plurality of pixels emitting light is placed on a panel support; an alignment step in which a light receiving unit located at any one of a plurality of points is aligned with the display panel by an alignment unit, wherein the alignment unit includes an alignment light transmitting unit emitting alignment light and an alignment light receiving unit receiving the alignment light, and either of the alignment light transmitting unit and the alignment light receiving unit is placed on the panel support; an emission step in which light is emitted from the display panel placed on the panel support; a light receiving step in which light emitted from some of the plurality of pixels is received by the light receiving unit; a measurement step in which information regarding the light of the received light is measured; and a movement step in which the position of the light receiving unit is changed to any one of the plurality of points. A method for measuring the light emission characteristics of a display panel, comprising an analysis step for measuring the light emission characteristics of the display panel through information regarding the received light, wherein the receiving step and the measurement step are performed multiple times, and in the receiving step, when the receiving part is located at a first point among the plurality of points, the emitted light emitted from the first pixels among the plurality of pixels is received, and in the receiving step, when the receiving part is located at a second point among the plurality of points different from the first point, the emitted light emitted from the second pixels among the plurality of pixels different from the first pixels is received. Claim 18 A method for measuring the light emission characteristics of a display panel according to claim 17, wherein some of the plurality of points are located within a predetermined coupling range, and the light emission characteristics of the display panel measured in the analysis step are light coupling efficiency, and the light coupling efficiency is the ratio of the amount of light of emitted light received while the receiving part is located within the coupling range to the amount of light of emitted light received while the receiving part is located within the coupling range, among the amount of light of emitted light received while the receiving step, the measuring step, and the moving step are performed multiple times. Claim 19 In claim 17, the emitted light emitted from each of the plurality of pixels or from a light-emitting group including a portion of the plurality of pixels that emits light may be emitted in a predetermined emission direction, and among the emitted light emitted from each of the plurality of pixels or from the light-emitting group, a cone, polygonal pyramid, frustum of a cone, or frustum of a polygonal pyramid centered on the emission direction may be defined as a central light, and the central light includes light of a predetermined diffusion ratio among the emitted light emitted from each of the plurality of pixels, and the angle between the generatrix or edge of the central light and the emission direction is defined as a diffusion angle, and the light emission characteristic of the display panel measured in the analysis step is a diffusion angle, and the emission direction and the position of the central light are measured through information regarding the position of the light-receiving part and the light received from the light-receiving part while the light-receiving step, the measurement step, and the movement step are performed multiple times, and the diffusion angle is measured through the emission direction and the position of the central light. Claim 20 In claim 17, the emitted light emitted from each of the plurality of pixels or from a light-emitting group including a portion of the plurality of pixels that emits light may be emitted in a predetermined emission direction, the angle between a direction perpendicular to the display panel and the emission direction is defined as a steering angle, the light emission characteristic of the display panel measured in the analysis step is the steering angle, and the emission direction is measured through information regarding the position of the light receiving part and the light received from the light receiving part while the light receiving step, the measurement step, and the movement step are performed multiple times, and the steering angle is measured through the emission direction. A method for measuring light emission characteristics.

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