Light measuring device

Abstract

There is provided a light measuring apparatus including: a first lens; a first variable opening positioned at a predetermined distance in the first direction from the first lens; a second lens positioned at a predetermined distance in the first direction from the first variable opening; a second variable opening positioned in the first direction from the second lens; a third lens positioned in the first direction from the second variable opening; and a light receiving unit positioned at a predetermined distance in the first direction from the third lens, in which a diameter of the first variable opening and a diameter of the second variable opening are independently adjusted. The light measuring device is capable of improving image quality.

Description

[0001] This application claims priority to Korean Patent Application No. 10-2023-0069506, filed on May 30, 2023, the disclosure of which is incorporated herein by reference in its entirety. Technical Field

[0002] The utility model relates to a light measuring device. Background Art

[0003] As information technology continues to further develop, the importance of display devices as a connecting medium between users and information continues to increase. In response to this, the use of display devices such as liquid crystal display devices and organic light emitting display devices is increasing.

[0004] Recently, near-eye display devices for realizing AR (augmented reality) or VR (virtual reality) are being developed. A light measuring device may be desired to check whether the near-eye display device accurately displays images to the human eye.

[0005] However, in the case of a near-eye display device, since the distance between the display device and the eye may be very small and the structure of the human eye (e.g., the size and position of the iris, pupil, retina, etc.) should be considered, evaluating light characteristics using traditional light measuring devices may not be accurate. Utility Model Content

[0006] The utility model aims to provide a light measuring device, which comprises: a first lens; a first variable opening, which is positioned at a predetermined distance along a first direction from the first lens; a second lens, which is positioned at a predetermined distance along the first direction from the first variable opening; a second variable opening, which is positioned along the first direction from the second lens; a third lens, which is positioned along the first direction from the second variable opening; and a light receiving unit, which is positioned at a predetermined distance along the first direction from the third lens, wherein the diameter of the first variable opening and the diameter of the second variable opening are independently adjusted.

[0007] In an embodiment of the present invention, the first lens includes a convex surface protruding in the first direction.

[0008] In an embodiment of the present invention, the second lens includes a convex surface protruding in a direction opposite to the first direction.

[0009] In an embodiment of the present invention, the third lens includes a convex surface protruding in the first direction.

[0010] In an embodiment of the present invention, the second variable opening includes a plurality of partial openings arranged in a second direction different from the first direction.

[0011] In an embodiment of the utility model, when the second variable opening has a first diameter, n partial openings among the multiple partial openings are in an open state, and when the second variable opening has a second diameter, m partial openings among the multiple partial openings are in an open state, wherein n and m are integers greater than 0, and wherein, when the second diameter is greater than the first diameter, m is greater than n.

[0012] In an embodiment of the present invention, each of the plurality of partial openings comprises: a transparent layer; a plurality of electronic ink capsules located inside the transparent layer; and a first electrode.

[0013] In an embodiment of the present invention, in each of the plurality of partial openings, the first electrode is located on the upper surface of the transparent layer.

[0014] In an embodiment of the present invention, each of the plurality of partial openings further includes: a second electrode insulated from the first electrode.

[0015] In an embodiment of the present invention, the second electrode is located on a side surface of the transparent layer.

[0016] In an embodiment of the present invention, the second electrode is located on the lower surface of the transparent layer.

[0017] In an embodiment of the present invention, each of the plurality of partial openings further includes: a third electrode located on a side surface of the transparent layer.

[0018] In an embodiment of the present invention, when a voltage is applied to the first electrode, each of the plurality of partial openings is in an open state.

[0019] In an embodiment of the present invention, when no voltage is applied to the first electrode, each of the plurality of partial openings is in a blocking state.

[0020] In an embodiment of the present invention, when a voltage is applied to the first electrode, each of the plurality of partial openings is in an open state.

[0021] In an embodiment of the present invention, when a voltage is applied to the second electrode, each of the plurality of partial openings is in a blocking state.

[0022] In an embodiment of the present invention, the distance between the first lens and the second lens is greater than the distance between the second lens and the third lens.

[0023] In an embodiment of the present invention, the first lens further includes a flat surface facing a direction opposite to the first direction.

[0024] In an embodiment of the present invention, the second lens further includes a flat surface facing the first direction.

[0025] In an embodiment of the present invention, the third lens further includes a flat surface facing a direction opposite to the first direction.

[0026] According to the utility model, the light measuring device may include a first variable opening and a second variable opening. By adjusting the diameter of the first variable opening and the diameter of the second variable opening, the diffraction effect caused by external light can be reduced, thereby obtaining a clear image with reduced noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and other features of the present invention will become more apparent by further describing exemplary embodiments of the present invention in detail with reference to the accompanying drawings, in which:

[0028] Figure 1 2 is a diagram showing a light measuring device according to an embodiment of the present invention.

[0029] Figure 2 and Figure 3 2 is a diagram showing a second variable opening according to an embodiment of the present invention.

[0030] Figure 4 is a diagram showing an electronic ink capsule.

[0031] Figure 5 and Figure 6 is a diagram showing a process of adjusting the diameter of the second variable opening.

[0032] Figure 7 , Figure 8 and Fig. 9 2 is a diagram showing a second variable opening according to an embodiment of the present invention. DETAILED DESCRIPTION

[0033] Hereinafter, various embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present invention can be implemented in various forms and is not limited to the embodiments described herein.

[0034] Throughout the specification and the drawings, the same or similar components are denoted by the same reference numerals, and repeated descriptions of the same components may be omitted or briefly discussed. Therefore, the above reference numerals may also be used in other drawings.

[0035] In the accompanying drawings, various thicknesses, lengths and angles are shown, and while the arrangements shown do represent embodiments of the present invention, it will be understood that modifications of various thicknesses, lengths and angles are possible within the spirit and scope of the present invention, and the present invention is not necessarily limited to the specific thicknesses, lengths and angles shown.

[0036] In addition, in the description, the expression "same" may mean "substantially the same". That is, it may be sufficient to make a person of ordinary skill in the art believe that it is the same. In other expressions, "substantially" may be omitted.

[0037] Figure 1 2 is a diagram showing a light measuring device according to an embodiment of the present invention.

[0038] Reference Figure 1 , a display device DD and a light measuring device ESTD are shown as examples.

[0039] The display device DD may include a conventional display panel (such as a liquid crystal display panel or an organic light emitting display panel) for displaying an image. It is assumed that the display panel has a plane extending along the second direction DR2 and the third direction DR3. For example, the display panel may have a completely flat surface or a curved surface. The display device DD may be a near-eye display device for realizing augmented reality (AR) or virtual reality (VR).

[0040] The display device DD may display an image in a first direction DR1. The first direction DR1, the second direction DR2, and the third direction DR3 may be substantially perpendicular to each other. Light PRY1 constituting an image may be emitted from the center of the display device DD. Another light MRY constituting an image may be emitted from an edge of the display device DD. Another light PRY2 constituting an image may be emitted at any position in the display device DD between the position where the light PRY1 is emitted and the position where the light MRY is emitted.

[0041] The light measuring device ESTD may include a first lens LNS1, a first variable opening VOPN1, a second lens LNS2, a second variable opening VOPN2, a third lens LNS3, and a light receiving unit SS. The light measuring device ESTD may be positioned in a first direction DR1 at a predetermined distance from the display device DD. The centers of the display device DD, the first lens LNS1, the first variable opening VOPN1, the second lens LNS2, the second variable opening VOPN2, the third lens LNS3, and the light receiving unit SS may be aligned with each other in the first direction DR1.

[0042] The first lens LNS1 may include a convex surface protruding in the first direction DR1. For example, the convex surface of the first lens LNS1 may face the first variable opening VOPN1. The first lens LNS1 may also include a flat surface in a direction opposite to the first direction DR1. In an embodiment of the present invention, the first lens LNS1 may also include a convex surface in a direction opposite to the first direction DR1.

[0043] The first variable opening VOPN1 may be positioned along the first direction DR1 from the first lens LNS1. For example, the light measuring device ESTD may further include a mechanical driving device such as a motor or an actuator. The first variable opening VOPN1 may be a mechanical hole whose diameter is controlled by a motor and / or a controller. The diameter of the first variable opening VOPN1 may be defined on a plane along the second direction DR2 and the third direction DR3. For example, the size of the diameter of the first variable opening VOPN1 may be adjusted according to the size of the measurement area (e.g., the size of the image displayed by the display device DD), the distance between the display device DD and the light measuring device ESTD, etc.

[0044] The second lens LNS2 may be positioned along the first direction DR1 from the first variable opening VOPN1. The second lens LNS2 may include a convex surface facing a direction opposite to the first direction DR1. For example, the convex surface of the second lens LNS2 may protrude in a direction opposite to the first direction DR1. The second lens LNS2 may also include a flat surface facing the first direction DR1. In an embodiment of the present invention, the second lens LNS2 may also include a convex surface in the first direction DR1.

[0045] The second variable opening VOPN2 may be positioned along the first direction DR1 from the second lens LNS2. For example, the diameter of the second variable opening VOPN2 may be adjusted independently of the diameter of the first variable opening VOPN1. The diameter of the second variable opening VOPN2 may be defined on a plane along the second direction DR2 and the third direction DR3. For example, the second variable opening VOPN2 may work like the pupil of a human eye. For example, the diameter of the second variable opening VOPN2 may be adjusted within a range of about 0.5 mm to about 8 mm. In a relatively dark environment, the diameter of the second variable opening VOPN2 may be increased to increase the amount of light received. In addition, in a relatively bright environment, the diameter of the second variable opening VOPN2 may be reduced, and the diffraction effect caused by external light may be reduced, thereby obtaining a clear image with reduced noise.

[0046] The third lens LNS3 may be positioned along the first direction DR1 from the second variable opening VOPN2. For example, the second variable opening VOPN2 may be located between the second lens LNS2 and the third lens LNS3. The third lens LNS3 may include a convex surface facing the first direction DR1. For example, the convex surface of the third lens LNS3 may protrude in the first direction DR1. The third lens LNS3 may also include a flat surface facing a direction opposite to the first direction DR1. In an embodiment of the present utility model, the third lens LNS3 may also include a convex surface facing a direction opposite to the first direction DR1.

[0047] According to an embodiment of the present invention, the second lens LNS2, the second variable aperture VOPN2 and the third lens LNS3 may be configured as an integrated variable aperture lens. A distance between the first lens LNS1 and the second lens LNS2 may be greater than a distance between the second lens LNS2 and the third lens LNS3.

[0048] The light receiving unit SS may be located at a predetermined distance from the third lens LNS3 in the first direction DR1. The light receiving unit SS may be an image sensor. For example, the light receiving unit SS may be a complementary metal oxide semiconductor (CMOS) sensor.

[0049] Figure 2 and Figure 3 2 is a diagram showing a second variable opening according to an embodiment of the present invention. Figure 4 is a diagram showing an electronic ink capsule.

[0050] Reference Figure 2 , the second variable opening VOPN2a according to an embodiment of the utility model may include a plurality of partial openings PAP1, PAP2, PAP3 and PAP4. The plurality of partial openings PAP1, PAP2, PAP3 and PAP4 may be arranged in the second direction DR2. Although only four partial openings PAP1, PAP2, PAP3 and PAP4 are shown here, the number of partial openings PAP1, PAP2, PAP3 and PAP4 included in the second variable opening VOPN2a may be more or less than four.

[0051] In addition, including Figure 2 In other drawings, only one side of the second variable aperture VOPN2a is shown to illustrate the light path in the first direction DR1. Figure 3 , a plurality of partial openings PAP1, PAP2, PAP3, PAP4, ... included in the second variable opening VOPN2a may be arranged on a plane along the second direction DR2 and the third direction DR3. For example, a plurality of partial openings PAP1, PAP2, PAP3, PAP4, ... may be arranged in a matrix form on a plane along the second direction DR2 and the third direction DR3.

[0052] Each of the partial openings PAP1 , PAP2 , PAP3 , and PAP4 may include a transparent layer LQL1 , LQL2 , LQL3 , or LQL4 , a plurality of electronic ink capsules CPS1 , CPS2 , CPS3 , or CPS4 , and a first electrode EL11 , EL12 , EL13 , or EL14 .

[0053] The transparent layer LQL1, LQL2, LQL3 or LQL4 may be formed of a transparent gas, a liquid or a solid. For example, the transparent layers LQL1, LQL2, LQL3 and LQL4 may be liquid polymer layers.

[0054] A plurality of electronic ink capsules CPS1, CPS2, CPS3, and CPS4 may be located inside transparent layers LQL1, LQL2, LQL3, and LQL4, respectively. In addition, even if four electronic ink capsules CPS1, CPS2, CPS3, or CPS4 are shown in each of the transparent layers LQL1, LQL2, LQL3, or LQL4, the present invention is not limited thereto. For example, the number of electronic ink capsules CPS1, CPS2, CPS3, or CPS4 may be less than or greater than four. In addition, even if four transparent layers LQL1, LQL2, LQL3, and LQL4 are shown, the present invention is not limited thereto. For example, the number of transparent layers LQL1, LQL2, LQL3, and LQL4 may be less than or greater than four.

[0055] The first electrodes EL11, EL12, EL13, and EL14 may be disposed on the transparent layers LQL1, LQL2, LQL3, and LQL4, respectively. For example, the first electrodes EL11, EL12, EL13, or EL14 may be arranged with the transparent layers LQL1, LQL2, LQL3, or LQL4 in the second direction DR2. For example, the first electrodes EL11, EL12, EL13, or EL14 may be disposed on the upper surface of the transparent layers LQL1, LQL2, LQL3, or LQL4. In an embodiment of the utility model, the first electrodes EL11, EL12, EL13, or EL14 may be arranged with the transparent layers LQL1, LQL2, LQL3, or LQL4 in a direction opposite to the second direction DR2. The first electrodes EL11, EL12, EL13, or EL14 may include a transparent conductive material. For example, the first electrode EL11, EL12, EL13 or EL14 may include silver nanowire (AgNW), indium tin oxide (ITO), indium zinc oxide (IZO), indium gallium zinc oxide (IGZO), antimony zinc oxide (AZO), indium tin zinc oxide (ITZO), zinc oxide (ZnO), tin oxide (SnO 2 ), at least one of carbon nanotubes and graphene.

[0056] Reference Figure 4 , shows an example of an electronic ink capsule CPS1. The electronic ink capsule CPS1 may include a transparent liquid TPL, first ink particles BIP, and second ink particles WIP.

[0057] The transparent liquid TPL may provide fluidity of the positions of the first ink particles BIP and the second ink particles WIP. For example, the first ink particles BIP and the second ink particles WIP may flow throughout the transparent liquid TPL.

[0058] The first ink particles BIP may be negatively charged particles. The first ink particles BIP may be black particles. In another example, the first ink particles BIP may be positively charged particles.

[0059] The second ink particles WIP may be positively charged particles. The second ink particles WIP may be white particles. In another example, the second ink particles WIP may be negatively charged particles.

[0060] In an embodiment of the present invention, the electronic ink capsule CPS1 may not include the second ink particles WIP, but may include only the transparent liquid TPL and the first ink particles BIP.

[0061] When no voltage is applied to the first electrode EL11, EL12, EL13, or EL14, the first ink particle BIP and the second ink particle WIP may be randomly distributed throughout the corresponding electronic ink capsule CPS1, CPS2, CPS3, or CPS4. Figure 2 As shown in , the second variable opening VOPN2a can block all the light RAY. In this case, the diameter of the second variable opening VOPN2a can be 0.

[0062] Figure 5 and Figure 6 is a diagram for explaining a process of adjusting the diameter of the second variable opening.

[0063] As described above, when no voltage is applied to the first electrodes EL11, EL12, EL13, or EL14, each of the plurality of partial openings PAP1, PAP2, PAP3, and PAP4 may be in a blocking state. For example, in the blocking state, the light RAY does not pass through at least some of the transparent liquid TPL and the transparent layers LQL1, LQL2, LQL3, and LQL4 of the electronic ink capsules CPS1, CPS2, CPS3, and CPS4.

[0064] In addition, when a voltage is applied to the first electrode EL11, EL12, EL13 or EL14, each of the plurality of partial openings PAP1, PAP2, PAP3 and PAP4 may be in an open state. For example, when a positive voltage is applied to the first electrode EL11, EL12, EL13 or EL14, the first ink particle BIP may be aligned in a direction close to the first electrode EL11, EL12, EL13 or EL14 or in a direction toward the first electrode EL11, EL12, EL13 or EL14, and the second ink particle WIP may be aligned in a direction away from the first electrode EL11, EL12, EL13 or EL14. Therefore, the light RAY may pass through the transparent liquid TPL of the electronic ink capsules CPS1, CPS2, CPS3 and CPS4 and the transparent layers LQL1, LQL2, LQL3 and LQL4.

[0065] In addition, when a negative voltage is applied to the first electrode EL11, EL12, EL13, or EL14, the second ink particles WIP may be aligned in a direction close to or toward the first electrode EL11, EL12, EL13, or EL14, and the first ink particles BIP may be aligned in a direction away from the first electrode EL11, EL12, EL13, or EL14. Therefore, the light RAY may pass through the transparent liquid TPL of the electronic ink capsules CPS1, CPS2, CPS3, and CPS4 and the transparent layers LQL1, LQL2, LQL3, and LQL4.

[0066] Reference Figure 5 , shows a case where the second variable opening VOPN2a has a first diameter. In this case, among the plurality of partial openings PAP1, PAP2, PAP3 and PAP4, n partial openings PAP2 and PAP3 may be in an open state, where n may be an integer greater than 0. Figure 5 In this case, n can be 2.

[0067] Reference Figure 6 , shows a case where the second variable opening VOPN2a has a second diameter. In this case, among the plurality of partial openings PAP1, PAP2, PAP3 and PAP4, m partial openings PAP1, PAP2, PAP3 and PAP4 may be in an open state, where m may be an integer greater than 0. Figure 6 In the case of , m may be 4. When the second diameter is greater than the first diameter, m may be greater than n.

[0068] Figures 7 to 9 2 is a diagram showing a second variable opening according to an embodiment of the present invention.

[0069] Reference Figure 7, each of the plurality of partial openings PAP1, PAP2, PAP3, and PAP4 of the second variable opening VOPN2b may further include a second electrode EL21, EL22, EL23, or EL24 insulated from the first electrode EL11, EL12, EL13, or EL14. The second electrode EL21, EL22, EL23, or EL24 may be positioned in a direction opposite to the second direction DR2 from the transparent layer LQL1, LQL2, LQL3, or LQL4. For example, the second electrode EL21, EL22, EL23, and EL24 may be located on a side of the transparent layer LQL1, LQL2, LQL3, and LQL4 opposite to a side on which the first electrodes EL11, EL12, EL13, and EL14 are disposed. For example, the second electrode EL21, EL22, EL23, and EL24 may be disposed on the lower surface of the transparent layer LQL1, LQL2, LQL3, and LQL4.

[0070] The second electrode EL21, EL22, EL23 or EL24 may include a transparent conductive material. For example, the second electrode EL21, EL22, EL23 or EL24 may include silver nanowire (AgNW), indium tin oxide (ITO), indium zinc oxide (IZO), indium gallium zinc oxide (IGZO), antimony zinc oxide (AZO), indium tin zinc oxide (ITZO), zinc oxide (ZnO), tin oxide (SnO 2 ), at least one of carbon nanotubes and graphene.

[0071] According to the present embodiment, in order to set each of the plurality of partial openings PAP1, PAP2, PAP3, and PAP4 to an open state, voltages having polarities different from each other may be applied to the first electrode EL11, EL12, EL13, or EL14 and the second electrode EL21, EL22, EL23, or EL24. For example, when a positive voltage is applied to the first electrode EL11, EL12, EL13, or EL14 and a negative voltage is applied to the second electrode EL21, EL22, EL23, or EL24, the first ink particles BIP may be aligned by moving in the second direction DR2, and the second ink particles WIP may be aligned by moving in a direction opposite to the second direction DR2.

[0072] Reference Figure 8, each of the plurality of partial openings PAP1, PAP2, PAP3, and PAP4 of the second variable opening VOPN2c may further include a third electrode EL31, EL32, EL33, or EL34. The third electrode EL31, EL32, EL33, or EL34 may be positioned from the transparent layer LQL1, LQL2, LQL3, or LQL4 in a direction opposite to the first direction DR1. For example, the third electrode EL31, EL32, EL33, and EL34 may be disposed on a side surface of the transparent layer LQL1, LQL2, LQL3, and LQL4 extending in the second direction DR2, and may be disposed adjacent to the first electrode EL11, EL12, EL13, and EL14. In an embodiment of the present utility model, the third electrode EL31, EL32, EL33, or EL34 may be positioned from the transparent layer LQL1, LQL2, LQL3, or LQL4 in the first direction DR1.

[0073] The third electrode EL31, EL32, EL33 or EL34 may include a transparent conductive material. For example, the third electrode EL31, EL32, EL33 or EL34 may include silver nanowire (AgNW), indium tin oxide (ITO), indium zinc oxide (IZO), indium gallium zinc oxide (IGZO), antimony zinc oxide (AZO), indium tin zinc oxide (ITZO), zinc oxide (ZnO), tin oxide (SnO 2 ), at least one of carbon nanotubes and graphene.

[0074] According to the present embodiment, in order to set each of the plurality of partial openings PAP1, PAP2, PAP3, and PAP4 to a blocking state, a voltage may be applied to the third electrodes EL31, EL32, EL33, and EL34. For example, when a positive voltage is applied to the third electrode EL31, EL32, EL33, or EL34, the first ink particles BIP may be aligned by moving in a direction opposite to the first direction DR1, and the second ink particles WIP may be aligned by moving in the first direction DR1. In addition, when a negative voltage is applied to the third electrode EL31, EL32, EL33, or EL34, the first ink particles BIP may be aligned by moving in the first direction DR1, and the second ink particles WIP may be aligned by moving in a direction opposite to the first direction DR1.

[0075] Compared with the case where the plurality of partial openings PAP1, PAP2, PAP3, and PAP4 do not include the third electrodes EL31, EL32, EL33, and EL34, in Figure 8 The light shielding effect can be improved in this case.

[0076] Fig. 9The second variable opening VOPN2d shows an embodiment of the present invention in which each of the plurality of partial openings PAP1, PAP2, PAP3, and PAP4 includes both the second electrode EL21, EL22, EL23, or EL24 and the third electrode EL31, EL32, EL33, or EL34.

[0077] The second variable aperture VOPN2d can perform Figure 7 and Figure 8 All functions described in . Their repeated descriptions may be omitted or briefly discussed.

[0078] The utility model can provide a light measuring device suitable for evaluating the light characteristics of a near-eye display device.

[0079] While the invention has been particularly shown and described with reference to embodiments thereof, it will be apparent to one skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

Claims

1. A light measuring device, characterized in that The light measuring device comprises: First lens; a first variable opening positioned at a predetermined distance along a first direction from the first lens; a second lens positioned a predetermined distance from the first variable opening along the first direction; a second variable opening positioned along the first direction from the second lens; a third lens positioned along the first direction from the second variable opening; and a light receiving unit located at a predetermined distance from the third lens along the first direction, Wherein, the light measuring device is configured so that the diameter of the first variable opening and the diameter of the second variable opening are independently adjusted.

2. The optical measuring device according to claim 1, characterized in that The first lens includes a convex surface protruding in the first direction.

3. The optical measuring device according to claim 2, characterized in that The second lens includes a convex surface protruding in a direction opposite to the first direction.

4. The optical measuring device according to claim 3, characterized in that The third lens includes a convex surface protruding in the first direction.

5. The optical measuring device according to claim 1, characterized in that The second variable opening includes a plurality of partial openings arranged in a second direction different from the first direction.

6. The optical measuring device according to claim 5, characterized in that When the second variable opening has a first diameter, the light measuring device is configured to make n partial openings among the plurality of partial openings in an open state, and when the second variable opening has a second diameter, the light measuring device is configured to make m partial openings among the plurality of partial openings in an open state, wherein n and m are integers greater than 0, and When the second diameter is greater than the first diameter, m is greater than n.

7. The optical measuring device according to claim 5, characterized in that Each of the plurality of partial openings comprises: Transparent layer; a plurality of electronic ink capsules disposed inside the transparent layer; and A first electrode.

8. The optical measuring device according to claim 7, characterized in that In each of the plurality of partial openings, the first electrode is located on an upper surface of the transparent layer.

9. The optical measuring device according to claim 8, characterized in that Each of the plurality of partial openings further comprises: The second electrode is insulated from the first electrode.

10. The optical measuring device according to claim 9, characterized in that The second electrode is located on a side surface of the transparent layer.

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