TW202115479A - Optical measuring device - Google Patents

Abstract

An optical measuring device provided in the invention is adapted to measure a projection image projected on a projection target by a projection device The optical measuring device includes a measuring unit and a processing unit. The measuring unit is disposed on the projection target. The measuring unit includes a first sensing strip and a second light sensing strip. The processing unit is electrically connected to the measuring unit. The first light sensing strip includes a plurality of first light sensing groups arranged obliquely along a first direction, and the second light sensing strip includes a plurality of second light sensing groups arranged obliquely along a second direction. Each of the first light sensing groups includes at least one first light sensing element, each of the second light sensing groups includes at least one second light sensing element, and the first direction is perpendicular to the second direction.

Description

Optical measuring device

The present invention relates to an electronic device, and more particularly to an optical measurement device for measuring projection images.

In the projection structure of a laser projector, the light source is generated by a laser diode, and is projected and imaged to the outside through a plurality of optical elements. However, because many different optical components, mechanical parts, and system assembly are installed on the light transmission path, the picture shifts due to temperature changes. During the development, installation, and/or proofreading process of the projector, the offset of the screen needs to be measured to confirm whether the projector or the projection screen meets expectations.

For example, in the process of measuring the projection image, a marker such as tape can be used to mark the initial position of the projection image, and the projector can be manually adjusted so that the projected image is aligned with the initial position identified by the marker. During the working process of the projector, if the projected image is shifted, another marker is used to record the shifted position of the projected image, and then manually measure or calculate the difference between the two before and after to obtain the shift of the image the amount. The influence of working time and working temperature on the image of the screen projected by the projector cannot be ignored. Therefore, it is necessary to record the working time and working temperature of the projector during the measurement. However, this measurement method has large errors and limited measurement accuracy, which also consumes a lot of time and human resources.

The "prior art" paragraph is only used to help understand the content of the present invention, so the contents disclosed in the "prior art" paragraph may include some conventional technologies that do not constitute the common knowledge in the technical field. The content disclosed in the "prior art" paragraph does not represent the content or the problem to be solved by one or more embodiments of the present invention, and has been known or recognized by those with ordinary knowledge in the technical field before the application of the present invention.

The invention provides an optical measuring device, which can effectively measure the degree of deviation of the projection image, effectively save manpower and time, and can greatly improve the accuracy of the measurement.

The other objectives and advantages of the present invention can be further understood from the technical features disclosed in the present invention.

In order to achieve one or part or all of the above objectives or other objectives, an embodiment of the present invention provides an optical measurement device for measuring the projection image projected from the projection device to the projection target. The optical measurement device includes a measurement unit and a processing unit. The measuring unit is arranged on the projection target. The measuring unit includes a first light sensing strip and a second light sensing strip. The processing unit is electrically connected to the measuring unit. The first light sensing strip includes a plurality of first light sensing groups arranged obliquely along a first direction, and the second light sensing strip includes a plurality of second light sensing groups arranged obliquely along a second direction. Each first light sensing group includes at least one first light sensing element, and each second light sensing group includes at least one second light sensing element, and the first direction is perpendicular to the second direction.

Based on the above, the embodiments of the present invention have at least one of the following advantages or effects. With the optical measurement device of the present invention, when the projection image is displaced, the processing unit receives the relevant signal according to the intensity and the change of the intensity of the light beam received by the light sensing element at different positions on the measurement unit, and the processing unit receives the relevant signal. The signal calculation obtains the displacement direction and displacement amount of the projection screen. In this way, the degree of deviation of the projection image can be effectively measured, manpower and time can be effectively saved, and the accuracy of the measurement can be greatly improved.

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail in conjunction with the accompanying drawings.

The foregoing and other technical contents, features, and effects of the present invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the drawings. The directional terms mentioned in the following embodiments, for example: up, down, left, right, front or back, etc., are only directions for referring to the attached drawings. Therefore, the directional terms used are used to illustrate but not to limit the present invention.

FIG. 1 is a schematic diagram of an optical measurement device in use according to an embodiment of the present invention. Please refer to FIG. 1, this embodiment provides an optical measurement device 100 for measuring the projection image P1 projected by the projection device 50 to the projection target 10. The projection target 10 is, for example, a screen or a wall, and the projection device 50 may be, for example, a projector including an illumination module, a light valve, and a projection lens, and the present invention is not limited thereto. The optical measurement device 100 includes a measurement unit 110 and a processing unit 120. The measurement unit 110 is configured on the projection target 10, and the processing unit 120 is electrically connected to the measurement unit 110. In this embodiment, the number of the measuring units 110 of the optical measuring device 100 is four, and they are respectively arranged at the four corner positions of the projection screen P1. The following description will take the four measuring units 110 as an example. However, in different embodiments, the number of measurement units 110 may be other numbers, and the present invention is not limited to this. In an embodiment, the number of measurement units 110 is two, and they can be respectively arranged at two diagonal positions of the projection screen P1.

In some embodiments, the processing unit 120 may include, for example, a central processing unit (CPU), or other programmable general-purpose or special-purpose microprocessors, or digital signal processors (Digital Signal Processors). Processor, DSP), programmable controller, application specific integrated circuit (Application Specific Integrated Circuits, ASIC), programmable logic device (Programmable Logic Device, PLD) or other similar devices or a combination of these devices, the present invention does not Not limited to this.

In some embodiments, the processing unit 120 can automatically receive relevant signals, calculate and store the position information of the projection screen in real time.

FIG. 2 is a schematic diagram of a measurement unit according to an embodiment of the invention. Please refer to FIGS. 1 and 2. The measurement unit 110 shown in FIG. 2 can be used at least in the optical measurement device 100 shown in FIG. 1. The following description uses the optical measurement device 100 in FIG. 1 to include the optical measurement device 100 in FIG. Take the case of the measurement unit 110 as an example. In this embodiment, the measurement unit 110 includes a first light sensing strip L1 and a second light sensing strip L2. For example, in this embodiment, the number of the first light sensing strip L1 and the number of the second light sensing strip L2 is four respectively. However, in different embodiments, the number of the first light sensing strip L1 and the second light sensing strip L2 can be designed to be one or more according to requirements, and the present invention is not limited thereto.

In detail, the first light sensing strip L1 includes a plurality of first light sensing groups G1 arranged obliquely along the first direction D1, and the second light sensing strip L2 includes a plurality of first light sensing groups G1 arranged obliquely along the second direction D2. A second light sensing group G2. Each first light sensing group G1 includes at least one first light sensing element 112_1, and each second light sensing group G2 includes at least one second light sensing element 112_2. In this embodiment, the number of the first light sensing strips L1 is multiple, and the multiple first light sensing strips L1 are arranged along the second direction D2 (for example, arranged in a straight line). The number of the second light sensing bars L2 is multiple, and the multiple second light sensing bars L2 are arranged along the first direction D1 (for example, arranged in a straight line). For example, each first light sensing bar L1 includes four first light sensing groups G1, and the four first light sensing groups G1 are arranged in a stepwise manner in the first direction D1. Each second light sensing strip L2 includes four second light sensing groups G2, and the four second light sensing groups G2 are arranged in a stepped manner in the second direction D2. In the embodiment shown in FIG. 2, the first light-sensing group G1 includes a single first light-sensing element 112_1, and the second light-sensing group G2 includes a single second light-sensing element 112_2. The first light sensing element 112_1 and the second light sensing element 112_2 are, for example, photodiodes or photoresistors, which can be used to sense the intensity of the light beam. In some embodiments, the light sensing element may have a width of 5 millimeters (mm), for example. The present invention is not limited to this. For example, the first direction D1 is a horizontal direction, the second direction D2 is a vertical direction, and the first direction D1 is perpendicular to the second direction D2, as shown in FIG. 2.

In one embodiment, according to the data measured by the measuring unit 110, the processing unit 120 can calculate the displacement direction and/or displacement of the projection screen P1 on the projection target 10 (that is, at different times , The difference between the different positions of the projection picture P1 on the projection target 10). In the embodiment shown in FIG. 2, the projection picture P1 and the projection picture P2 respectively represent projection pictures located at different positions. When measuring the projection picture P1, since the plurality of first light sensing groups G1 are arranged obliquely in the first direction D1, when the projection picture P1 covers the first light sensing strip L1 of the measuring unit 110, the first light sensing group G1 The first light sensing elements 112_1 at different positions on the sensing bar L1 can receive light beams with different light intensities, so each first light sensing element 112_1 can generate different signals (for example, electrical signals). In detail, with regard to the projection screen P1, as shown in FIG. 2, the first light sensing element 112_1_a is located within the range of the projection screen P1, so the intensity of the light beam sensed is relatively large, and the first light sensing element 112_1_c is located in the projection screen. The image P1 is outside the range, so the intensity of the light beam sensed is small (for example, the intensity of the light beam sensed by the first light sensing element 112_1_c is zero), and the first light sensing element 112_1_b and the projection image P1 The ranges partially overlap, so the intensity of the sensed beam is between the first light sensing elements 112_1_a and 112_1_c. Accordingly, according to the comparison of the light intensity sensed by each first light sensing element 112_1, an edge of the projection picture P1 (for example, the lower part of the projection picture P1 as shown in FIG. 2) can be calculated by the processing unit 120 The edge) is located within the range of the first light sensing element 112_1_b. Similarly, since the plurality of second light sensing groups G2 are arranged obliquely in the second direction D2, when the projection image P1 covers the second light sensing strip L2 of the measuring unit 110, the second light sensing strip L2 The second light sensing elements 112_2 at different positions can receive light beams with different light intensities, so each of the first light sensing elements 112_2 can generate different signals (for example, electrical signals). In detail, as for the projection screen P1, as shown in FIG. 2, the second light sensing element 112_2_a is located within the range of the projection screen P1, so the intensity of the light beam sensed is relatively large, and the second light sensing element 112_2_c is located in the projection The image P1 is outside the range, so the intensity of the light beam sensed is small, and the second light sensing element 112_2_b partially overlaps the range of the projection image P1, so the intensity of the light beam sensed is between the second light sensing elements 112_2_a and 112_2_c. between. According to this, according to the comparison of the light intensity sensed by each second light sensing element 112_2, the processing unit 120 calculates the other edge of the projection picture P1 (for example, the projection picture P1 shown in FIG. 2 The right edge) is located within the range of the second light sensing element 112_2_b. Therefore, the position information of the overall projection screen P1 can be obtained by the plurality of first light sensing elements 112_1 and the plurality of second light sensing elements 112_2.

Similarly, the position information of the overall projection screen P2 can be obtained. By comparing the position information of the overall projection screen P1 and the position information of the overall projection screen P2, the displacement direction and displacement amount of the projection screen can be obtained. In this way, the degree of deviation of the projection screen P1 can be effectively measured, manpower and time can be effectively saved, and the accuracy of the measurement can be greatly improved.

In some embodiments, the method of determining the displacement direction and displacement amount of the projection screen is not limited to this. For example, the first light sensing group G1 may include a greater number of first light sensing elements 112_1, and/or the second light sensing group G2 may include a greater number of second light sensing elements 112_2 (please refer to FIG. 5). In other embodiments, the arrangement of the plurality of first light sensing elements 112_1 and/or the plurality of second light sensing elements 112_2 may be different from the embodiment shown in FIG. 2, and the present invention is not limited thereto.

In the embodiment shown in FIG. 2, in each first light sensing strip L1, the distance B1 between two adjacent first light sensing groups G1 along the second direction D2 is smaller than that of each first light sensing group G1 along the second direction D2. Dimension C1 in direction D2. In each second light sensing strip L2, the distance B2 between two adjacent second light sensing groups G2 along the first direction D1 is smaller than the size C2 of each second light sensing group G2 along the first direction D1. As shown in FIG. 2, in this embodiment, the achievable measurement accuracy of the measurement unit 110 in the second direction D2 is B1, and the measurement accuracy in the first direction D1 is B2. Since the spacing B1 is smaller than the size C1, and the spacing B2 is smaller than the size C2, the measurement unit 110 of this embodiment can achieve better measurement accuracy.

In some embodiments, the processing unit 120 may be electrically connected to the display device 60. The display device 60 can be used to display the screen displacement information obtained by the processing unit 120. The display device 60 is, for example, a monitor or a desktop computer, but the invention is not limited to this. In addition, in this embodiment, the processing unit 120 can also be selectively electrically connected to the projection device 50, so that the position or light intensity information of the projection screen P1 projected by the projection device 50 can be provided to the processing unit 120 to Improve the accuracy of operations performed by the processing unit 120.

In other embodiments, a temperature sensor may be provided at an appropriate position of the projection device 50. Since the projection device 50 is electrically connected to the processing unit 120, the processing unit 120 can receive and store the temperature information of the projection device 50 in real time. In this case, since the processing unit 120 stores the position information of the projection screen and the temperature information of the projection device 50, a more comprehensive information analysis can be realized.

In this embodiment, the measurement unit 110 may further include a substrate 114, such as a circuit board. The substrate 114 includes a first part 114_1 and a second part 114_2. The first light sensing strip L1 and the second light sensing strip L2 are respectively disposed on the first portion 114_1 and the second portion 114_2 of the substrate 114. In this embodiment, the extending direction of the first portion 114_1 of the substrate 114 is parallel to the first direction D1, the extending direction of the second portion 114_2 of the substrate 114 is parallel to the second direction D2, and the first portion 114_1 and the first portion 114_1 The second part 114_2 may be L-shaped on the projection target 10. As shown in FIG. 1 and FIG. 2, in this embodiment, the first part 114_1 and the second part 114_2 can be two parts to be combined to form the substrate 114. However, the present invention is not limited to this. In other embodiments, the first part 114_1 and the second part 114_2 can also be formed as one body.

FIG. 3 is a partial cross-sectional view of a measurement unit according to an embodiment of the invention. For example, FIG. 3 may be a partial cross-sectional view of the measuring unit 110 of FIG. 2 along the line A-A'. Please refer to FIGS. 2 and 3. The measurement unit 110 shown in FIG. 3 can be at least a part of the measurement unit 110 shown in FIG. 2. In FIG. 2, the shading element 116 is omitted for convenience of description. In FIG. 3, a part of the first part 114_1 of the substrate 114 of the measurement unit 110 is taken as an example for illustration. In the embodiment shown in FIG. 3, the measurement unit 110 further includes a shading element 116, and the shading element 116 includes a first shading portion 116_1 and a second shading portion (not shown in FIG. 3 ). The first shading portion 116_1 has a plurality of first openings O1 corresponding to the plurality of first light sensing elements 112_1, and the second shading portion has a plurality of second openings corresponding to the plurality of second light sensing elements 112_2 (not shown in FIG. 3). Illustrated). In this embodiment, the number of first openings O1 is the same as the number of first light sensing elements 112_1, and the number of second openings is the same as the number of second light sensing elements 112_2, but the invention is not limited to this. In other embodiments, for example, in the first light-shielding portion 116_1 of the light-shielding element 116, the number of the first openings O1 may be less than the number of the first light sensing elements 112_1, and the number of the second openings may be less than the number of the second light sensing elements. The number of 112_2. For example, one first opening O1 may correspond to a plurality of first light sensing elements 112_1, and similarly, a second opening may correspond to a plurality of second light sensing elements 112_2. In this embodiment, the first shading part and the second shading part may be two parts to be combined to form the shading element 116. However, the present invention is not limited to this. In other embodiments, the first light shielding portion and the second light shielding portion may also be integrally formed.

In this embodiment, the size C3 of the first opening O1 along the second direction D2 is smaller than the size C4 of the first light sensing element 112_1 along the second direction D2. Similarly, the size of the second opening along the first direction D1 is smaller than the size of the second light sensing element 112_2 along the first direction D1. As shown in Figure 3, C3<C4. In this embodiment, when measuring the projection image, the shading element 116 can help avoid mutual interference between adjacent light sensing elements, so as to accurately determine the light intensity of the light beam received by the light sensing elements at different positions. For example, the size C4 of the first light sensing group G1 along the second direction D2 may be, for example, 1 millimeter (mm), and the first light sensing strip L1 includes four first light sensing groups G1, correspondingly, The first light shielding portion 116_1 has four first openings O1 corresponding to the first light sensing strip L1, and the size C3 of the first opening O1 along the second direction D2 is not greater than 1 millimeter (mm). In this case, the four first light sensing groups G1 of the first light sensing strip L1 may not be arranged in a stepped manner, but the four first openings O1 corresponding to the four first light sensing groups G1 may be arranged Arranged in steps. For example, the four first light sensing groups G1 of the first light sensing strip L1 may be arranged in a straight line along the first direction D1, and the four first openings O1 may be arranged in a stepwise manner along the first direction D1, and are mutually aligned. The minimum distance between two adjacent first openings O1 along the second direction D2 is 0.25 millimeters (mm). In such a configuration, the achievable measurement accuracy of the measurement unit 110 in the second direction D2 is 0.25 millimeters (mm).

4 is a partial cross-sectional view of a measurement unit according to another embodiment of the invention. For example, FIG. 4 may be a partial cross-sectional view of the measuring unit 110 of FIG. 2 along the line E-E'. Please refer to FIGS. 2 and 4. The measurement unit 110A shown in FIG. 4 can be at least a part of the measurement unit 110 shown in FIG. 2. In FIG. 4, a part of the first part 114_1 of the substrate 114 of the measuring unit 110A is taken as an example for illustration. In the embodiment shown in FIG. 4, the first shading portion 116_1A has a plurality of first sidewalls S1 surrounding the first opening O1, and the second shading portion has a plurality of second sidewalls surrounding the second opening (not shown in FIG. 4). Show). In this embodiment, in the first shading portion 116_1A, the first side wall S1 may be formed by the shading element 116A extending toward the substrate 114. Similarly, in the second shading part, the second side wall can be formed by extending the shading element 116A toward the substrate 114. In this embodiment, when measuring the projection image, the first side edge S1 arranged around the first opening O1 and/or the second side edge arranged around the second opening can further prevent the adjacent light sensing elements from being spaced. Interference with each other, so as to accurately determine the light intensity of the light beam received by the light sensing element at different positions.

FIG. 5 is a schematic diagram of a measurement unit when tilted according to an embodiment of the present invention. Please refer to FIG. 5. The measurement unit 110B shown in FIG. 5 is similar to the measurement unit 110 shown in FIG. 2. The difference between the two is that in this embodiment, the first light sensing group G1 includes two first light sensing elements 112_1 (112_1_d, 112_1_e), and when viewed along the second direction D2, the two first light sensing elements The measuring elements 112_1_d and 112_1_e are arranged in parallel. The second light sensing group G2 includes two second light sensing elements 112_2, and when viewed along the first direction D1, the two second light sensing elements 112_2 are arranged side by side. For example, in the embodiment shown in FIG. 5, the two first light sensing elements 112_1_d, 112_1_e of the first light sensing group G1 have the same coordinates in the second direction D2, and the second light sensing group G1 The two second light sensing elements 112_2 of G2 have the same coordinates in the first direction D1. When the projection image is skewed on the projection target 10, for example, when the projection image P1 is skewed by an angle θ in FIG. 5, the two first light sensing elements 112_1 in a first light sensing group G1 will receive different light intensities. Beam. Therefore, the two first light sensing elements 112_1 can respectively generate different signals (for example, electrical signals). Similarly, the two second light sensing elements 112_2 in a second light sensing group G2 can also receive light beams with different light intensities, and then generate different signals respectively. In detail, as shown in FIG. 5, both the first light sensing element 112_1_f and the first light sensing element 112_1_g overlap with the range of the projection screen P1, but because the first light sensing element 112_1_f overlaps with the projection screen P1 in the range It is smaller than the overlapping range of the first light sensing element 112_1_g and the projection screen P1, so the light beam intensity sensed by the two is different, and further, the light beam intensity sensed by the first light sensing element 112_1_f is smaller than that of the first light sensing element 112_1_g The intensity of the sensed beam. Accordingly, the skew angle θ of the projection screen P1 can be calculated by the processing unit 120 based on the comparison of the light intensity sensed by the first light sensing elements 112_1_f and 112_1_g. In this way, the measurement unit 110B of this embodiment can be used to measure and analyze the difference in light intensity sensed by different light sensing elements in the same light sensing group to determine the degree of skew of the projection screen P1, and then Therefore, the user can adjust the skew angle of the projection image of the projection device 100 on the projection target 10 to zero according to the aforementioned skew degree.

In summary, the embodiments of the present invention have at least one of the following advantages or effects. With the optical measurement device of the present invention, when the projection image is displaced, the processing unit receives the relevant signals according to the intensity of the light beams received by the light sensing elements at different positions on the measurement unit, and calculates the results from these signals The displacement direction and amount of the projection screen. In this way, the degree of deviation of the projection image can be effectively measured, manpower and time can be effectively saved, and the accuracy of the measurement can be greatly improved.

However, the above are only preferred embodiments of the present invention, and should not be used to limit the scope of implementation of the present invention, that is, simple equivalent changes and modifications made in accordance with the scope of the patent application of the present invention and the description of the invention, All are still within the scope of the invention patent. In addition, any embodiment of the present invention or the scope of the patent application does not have to achieve all the objectives or advantages or features disclosed in the present invention. In addition, the abstract part and title are only used to assist in searching for patent documents, and are not used to limit the scope of rights of the present invention. In addition, the terms "first" and "second" mentioned in this specification or the scope of the patent application are only used to name the element (element) or to distinguish different embodiments or ranges, and are not used to limit the number of elements. Upper or lower limit.

10: Projection target 50: Projection device 60: display device 100: Optical measuring device 110, 110A, 110B: measuring unit 112_1, 112_1_a~112_1_g: the first light sensing element 112_2, 112_2_a~112_2_g: second light sensing element 114: substrate 114_1: The first part 114_2: The second part 116, 116A: shading element 116_1, 116_1A: first shading part 120: processing unit A-A’, E-E’: Line B1, B2: spacing C1, C2, C3, C4: size D1: First direction D2: second direction G1: The first light sensing group G2: The second light sensing group L1: The first light sensing strip L2: Second light sensing strip O1: opening P1, P2: Projection screen S1: sidewall θ: Angle

FIG. 1 is a schematic diagram of an optical measurement device in use according to an embodiment of the present invention. FIG. 2 is a schematic diagram of a measurement unit according to an embodiment of the invention. FIG. 3 is a partial cross-sectional view of a measurement unit according to an embodiment of the invention. 4 is a partial cross-sectional view of a measurement unit according to another embodiment of the invention. FIG. 5 is a schematic diagram of a measurement unit when tilted according to an embodiment of the present invention.

10: Projection target

50: Projection device

60: display device

100: Optical measuring device

110: Measuring unit

120: processing unit

P1: Projection screen

Claims (17)

An optical measurement device for measuring a projection image projected by a projection device to a projection target, the optical measurement device comprising: A measurement unit configured on the projection target, the measurement unit including a first light sensing bar and a second light sensing bar; and The processing unit is electrically connected to the measuring unit, wherein the first light sensing strip includes a plurality of first light sensing groups arranged obliquely along a first direction, and the second light sensing strip includes A plurality of second light-sensing groups arranged obliquely in two directions, each of the first light-sensing groups includes at least one first light-sensing element, and each of the second light-sensing groups includes at least one second light-sensing element , And the first direction is perpendicular to the second direction. The optical measurement device according to claim 1, wherein each of the first light-sensing groups includes a plurality of the first light-sensing elements, and the plurality of first light-sensing elements are in the second direction Each of the second light-sensing groups includes a plurality of the second light-sensing elements, and the plurality of second light-sensing elements are arranged in parallel in the first direction. The optical measurement device according to claim 1, wherein the measurement unit includes a plurality of the first light sensing strips, and the first light sensing strips are arranged linearly along the second direction, and wherein The measuring unit includes a plurality of the second light sensing strips, and the second light sensing strips are linearly arranged along the first direction. According to the optical measurement device described in claim 1, wherein in the first light-sensing strip, the distance between two adjacent first light-sensing groups along the second direction is smaller than that of the first light-sensing groups. The size of any one of the sensing groups along the second direction, and in the second light sensing strip, the distance between two adjacent second light sensing groups along the first direction is smaller than the second The size of any one of the light sensing groups along the first direction. The optical measurement device described in item 1 of the scope of patent application, wherein the optical measurement device includes two measurement units, and the two measurement units are respectively arranged in the projection target corresponding to the two projection images Diagonally. The optical measurement device described in item 1 of the scope of patent application, wherein the optical measurement device includes four measurement units, and the four measurement units are respectively arranged in the projection target corresponding to the four projection images At the corner. According to the optical measurement device described in claim 1, wherein the measurement unit further includes a substrate, the substrate includes a first part and a second part, and wherein the first light sensing strip and The second light sensing strips are respectively arranged on the first part and the second part. According to the optical measurement device described in item 7 of the scope of patent application, the first part and the second part of the substrate are formed as one body. For the optical measurement device described in claim 7, wherein the extending direction of the first part of the substrate is parallel to the first direction, and the extending direction of the second part of the substrate is parallel to the second Direction, and the first part and the second part present an L-shape on the projection target. The optical measurement device according to claim 1, wherein the measurement unit further includes a shading element, and the shading element includes a first shading part and a second shading part, and wherein the first shading part There are a plurality of first openings corresponding to the first light sensing elements, and the second light shielding portion has a plurality of second openings corresponding to the second light sensing elements. The optical measurement device according to claim 10, wherein the number of the first openings is the same as the number of the first light sensing elements, and the number of the second openings is the same as the number of the second The number of light sensing elements. The optical measurement device according to claim 10, wherein the size of the first openings along the second direction is smaller than the size of the first light sensing elements along the second direction, and the second The size of the opening along the first direction is smaller than the size of the second light sensing elements along the first direction. The optical measurement device according to claim 10, wherein the first shading part has a plurality of first side walls surrounding the first openings, and the second shading part has a plurality of first side walls surrounding the second openings. A second side wall, wherein the first side walls and the second side walls extend from the shading element toward the substrate. According to the optical measurement device described in claim 10, the first shading part and the second shading part are formed as one body. The optical measurement device according to claim 1, wherein the at least one first light-sensing element and/or the at least one second light-sensing element receives light beams of different light intensities, and the at least one first light-sensing element The light sensing element and/or the at least one second light sensing element generate different signals, and the processing unit is used for receiving the signals, and calculating the projection image on the projection target based on the signals Displacement direction and displacement amount. According to the optical measurement device described in claim 1, wherein the processing unit is electrically connected to a display device. According to the optical measurement device described in item 1 of the scope of patent application, the processing unit is electrically connected to the projection device.

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