KR-20260063252-A - 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.

Inventors

• 김상현
• 백우진

Assignees

• 한국과학기술원

Dates

Publication Date

20260507

Application Date

20241030

Claims (20)

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

Description

Light Emission Characteristics Measuring System for Display Panel and Method Thereof 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. 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. 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. 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. 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 an 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 a display arrangement section and a scanning section according to one embodiment of the present invention. 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. Hereinafter, embodiments of the present invention will be described with reference to the drawings. 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. 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. Terms such as "include" are intended to indicate the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described