# US 10,481,472 B2 · Method and device for projection parameter adjustment and projection apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,481,472 B2 - Document ID: US10481472B2 - Status: Granted - Kind: B2 - Application number: 15/743,422 - Filed: 2017-04-17 - Published: 2018-07-19 - Granted: 2019-11-19 - Earliest claimed: 2016-06-17 - Assignees: Boe Technology Group Co., Ltd. - Applicants: BOE Technology Group Co., Ltd. - Inventors: Lihua Geng - Web page: https://patentgrep.com/patent/US10481472B2 ## CPC - G03B 21/142: {Adjusting of projection optics} - G03B 21/145: {Housing details, e.g. position adjustments thereof} - G03B: APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D) ## Abstract There is provided a method and device for projection parameter adjustment and a projection apparatus. The method comprises adjusting a projector in accordance with predetermined patterns sequentially, wherein the predetermined patterns correspond to respective projection parameters. For each predetermined pattern, step of adjusting the projector according to the predetermined pattern includes: controlling the projector to display the predetermined pattern in accordance with a predetermined display condition corresponding to the predetermined pattern; measuring luminance of predetermined positions in a theoretical display area of the projector in accordance with the predetermined measurement condition; judging whether the predetermined pattern matches with the theoretical display region in accordance with the luminance; and under the condition the predetermined pattern does not match with the theoretical display area, adjusting the projector and repeating above steps until the predetermined pattern matches with the theoretical display area. ## Claims ### Claim 1 A method for projection parameter adjustment, comprising: adjusting a projector in accordance with a plurality of predetermined patterns sequentially, wherein each of the predetermined patterns corresponds to a projection parameter, the projection parameter includes one or more of a position where the projector is placed, an angle at which a lens of the projector is rotated about an axis of the lens and a position of the lens of the projector, and for each predetermined pattern, the step of adjusting the projector according to the predetermined pattern includes: Step S1, controlling the projector to display the predetermined pattern in accordance with a predetermined display condition corresponding to the predetermined pattern; Step S2, measuring luminance of a plurality of predetermined positions in a theoretical display area of the projector in accordance with the predetermined measurement condition; Step S3, judging whether the predetermined pattern matches with the theoretical display region in accordance with the luminance of the plurality of predetermined positions; and Step S4, under the condition the predetermined pattern does not match with the theoretical display area, adjusting the projector and repeating Step S1 to Step S3 until the predetermined pattern matches with the theoretical display area. ### Claim 2 (depends on 1) The method for projection parameter adjustment according to claim 1, wherein the step of adjusting the projector comprises: adjusting the position where the projector is placed. ### Claim 3 (depends on 1) The method for projection parameter adjustment according to claim 1, wherein under the condition that the projection parameter comprises the position where the projector is placed, the predetermined patterns include a first predetermined pattern in a rectangular shape having a first predetermined luminance, and wherein Step S1 comprises: controlling the projector to display the first predetermined pattern under the condition the projector being in a state of the maximum focal length; Step S2 comprises: measuring the luminance of each predetermined position, respectively; Step S3 comprises: determining that the first predetermined pattern does not match with the theoretical display area under the condition there is a position in the plurality of predetermined positions where the luminance is less than the first predetermined luminance; and determining that the first predetermined pattern matches with the theoretical display area under the condition the luminance of the plurality of predetermined positions is greater than or equal to the first predetermined luminance. ### Claim 4 (depends on 3) The method for projection parameter adjustment according to claim 3, wherein under the condition that the projection parameter comprises the angle at which the lens of the projector rotates about the axis of the lens, the predetermined patterns include a second predetermined pattern which is a part of the first predetermined pattern, and a connecting line of at least two predetermined positions in the plurality of predetermined positions is parallel to the width direction of the theoretical display area, and wherein Step S1 comprises: controlling the second predetermined pattern to move from one side to the other side of an area corresponding to the first predetermined pattern; Step S2 comprises: measuring the luminance of a plurality of predetermined positions and recording a time at which each of predetermined positions reaches the first predetermined luminance; Step S3 comprises: determining that the second predetermined pattern does not match with the theoretical display area under the condition the at least two predetermined positions having the connecting line parallel to the width direction of the theoretical display area reach the first predetermined luminance at different time; and determining that the second predetermined pattern matches with the theoretical display area under the condition the at least two predetermined positions having the connecting line parallel to the width direction of the theoretical display area reach the first predetermined luminance at the same time; and Step S4 comprises: rotating the lens of the projector about the axis of the lens of the projector. ### Claim 5 (depends on 4) The method for projection parameter adjustment according to claim 4, wherein under the condition that the projection parameter comprises the position of the lens of the projector, the predetermined patterns include a third predetermined pattern which has a second predetermined luminance and a shape similar to the theoretical display area, and the third predetermined pattern covers all the plurality of predetermined positions; Step S1 comprises: controlling the third predetermined pattern to be gradually reduced until there is a predetermined position where a third predetermined luminance less than the second predetermined luminance is reached in the plurality of predetermined positions; Step S2 comprises: measuring the luminance of the plurality of predetermined positions and recording a time at which each of predetermined positions reaches the third predetermined luminance; Step S3 comprises: determining that the third predetermined pattern does not match with the theoretical display area under the condition the plurality of predetermined positions reach the third predetermined luminance at different time; and determining that the third predetermined pattern matches with the theoretical display area under the condition the plurality of predetermined positions reach the third predetermined luminance at the same time; and Step S4 comprises: translating the lens of the projector in a direction towards the predetermined position that first reaches the third predetermined luminance. ### Claim 6 (depends on 5) The method for projection parameter adjustment according to claim 5, wherein the plurality of predetermined positions define a shape that is concentric with and geometrically similar to the theoretical display area. ### Claim 7 (depends on 1) The method for projection parameter adjustment according to claim 1, wherein the theoretical display area is in a rectangular shape, a number of predetermined positions is three, and the three predetermined positions are located at three different corners of the theoretical display area, respectively. ### Claim 8 (depends on 1) The method for projection parameter adjustment according to claim 1, further comprising: providing a prompt message under the condition the predetermined patterns do not match with the theoretical display area. ### Claim 9 A device for projection parameter adjustment comprising: a display control circuit, configured to control a projector to display a plurality of predetermined patterns in accordance with a plurality of predetermined display conditions corresponding to the plurality of predetermined patterns, each of predetermined patterns corresponding to a projection parameter, and the projection parameter including one or more of a position where the projector is placed, an angle at which a lens of the projector is rotated about an axis of the lens and a position of the lens of the projector; a luminance acquisition circuit, configured to measure luminance of a plurality of predetermined positions in a theoretical display area of the projector in accordance with the predetermined measurement condition; a matching judgment circuit, configured to judge whether the predetermined patterns match with the theoretical display region in accordance with the luminance of the plurality of predetermined positions; a control circuit, configured to generate an adjustment signal for adjusting the projector under the condition a judgment result indicating a mismatch is received from the matching judgment circuit and generate an enabled signal for controlling operation of the luminance acquisition circuit after the adjustment signal is generated; and a drive circuit, configured to adjust operation of the projector in accordance with the adjustment signal output from the control circuit. ### Claim 10 (depends on 9) The device for projection parameter adjustment according to claim 9, wherein under the condition that the projection parameter comprises the position where the projector is placed, the predetermined patterns comprise a first predetermined pattern in a rectangular shape having a first predetermined luminance, and wherein the display control circuit is configured to directly display the first predetermined pattern in accordance with a predetermined display condition corresponding to the first predetermined pattern, the luminance acquisition circuit is configured to measure the respective luminance of predetermined positions, the matching judgment circuit is configured to generate a first judgment result indicating that the first predetermined pattern does not match with the theoretical display area under the condition there is a position in a plurality of predetermined positions where the luminance is less than the first predetermined luminance, or to generate a judgment result indicating that the first predetermined pattern matches with the theoretical display area under the condition the luminance of the plurality of predetermined positions is greater than or equal to the first predetermined luminance, and the control circuit is configured to generate a placement position adjustment signal for adjusting the position where the projector is placed under the condition the first judgment result is received. ### Claim 11 (depends on 10) The device for projection parameter adjustment according to claim 10, wherein under the condition that the projection parameter comprises the angle at which the lens of the projector rotates about an axis of the lens, the predetermined patterns comprise a second predetermined pattern which is a part of the first predetermined pattern, and a connecting line of at least two of the plurality of predetermined positions is parallel to a width direction of the theoretical display area, and wherein the display control circuit is configured to, in accordance with a predetermined display condition corresponding to the second predetermined pattern, control the second predetermined pattern to move from one side to the other side of the area corresponding to the first predetermined pattern, the luminance acquisition circuit is configured to measure the luminance of a plurality of predetermined positions and record the time at which each of predetermined positions reaches the first predetermined luminance, the matching judgment circuit is configured to generate a second judgment result indicating that the second predetermined pattern does not match the theoretical display area under the condition the at least two predetermined positions having the connecting line parallel to the width direction of the theoretical display area reach the first predetermined luminance at different time, or to generate a judgment result indicating that the second predetermined pattern matches with the theoretical display area under the condition the at least two predetermined positions having the connecting line parallel to the width direction of the theoretical display area reach the first predetermined luminance at the same time, and the control circuit is configured to generate a rotation adjustment signal for controlling rotation of the lens of the projector about the axis of the lens under the condition the second judgment result is received. ### Claim 12 (depends on 11) The device for projection parameter adjustment according to claim 11, wherein under the condition that the projection parameter comprises the position of the lens of the projector, the predetermined pattern comprise a third predetermined pattern having a second predetermined luminance and a shape similar to the theoretical display area, and third predetermined pattern covers all the predetermined positions, the display control circuit is configured to, in accordance with the predetermined display condition corresponding to the third predetermined pattern, control the third predetermined pattern to be gradually reduced until there is a predetermined position where a third predetermined luminance less than the second predetermined luminance is reached in the plurality of predetermined positions, the luminance acquisition circuit is configured to measure the luminance of the plurality of predetermined positions and record the time at which each of predetermined positions reaches the third predetermined luminance, the matching judgment circuit is configured to generate a third judgment result indicating that the third predetermined pattern does not match with the theoretical display area under the condition the plurality of predetermined positions reach the third predetermined luminance at different time, or to generate a judgment result indicating that the third predetermined pattern matches with the theoretical display area under the condition the plurality of predetermined positions reach the third predetermined luminance at the same time, and the control circuit is configured to generate a lens position adjustment signal for controlling the lens of the projector to translate in a direction toward a predetermined position that first reaches the third predetermined luminance under the condition the third judgment result is received. ### Claim 13 (depends on 9) The device for projection parameter adjustment according to claim 9, further comprising an alarm circuit configured to generate a prompt message under the condition the judgment result indicating that the predetermined patterns do not match with the theoretical display area is received from the matching judgment circuit. ### Claim 14 (depends on 9) The device for projection parameter adjustment according to claim 9, further comprising a communication circuit configured to transmit the adjustment signal output from the control circuit to the drive circuit. ### Claim 15 (depends on 14) The device for projection parameter adjustment according to claim 14, further comprising a luminance sensor which is in connection with the luminance acquisition circuit and is configured to detect the luminance. ### Claim 16 A projection apparatus comprising a device for projection parameter adjustment, wherein the device for projection parameter adjustment comprises: a display control circuit, configured to control a projector to display a plurality of predetermined patterns in accordance with a plurality of predetermined display conditions corresponding to the plurality of predetermined patterns, each of predetermined patterns corresponding to a projection parameter, and the projection parameter including one or more of a position where the projector is placed, an angle at which a lens of the projector is rotated about an axis of the lens and a position of the lens of the projector; a luminance acquisition circuit, configured to measure luminance of a plurality of predetermined positions in a theoretical display area of the projector in accordance with the predetermined measurement condition; a matching judgment circuit, configured to judge whether the predetermined patterns match with the theoretical display region in accordance with the luminance of the plurality of predetermined positions; a control circuit, configured to generate an adjustment signal for adjusting the projector under the condition a judgment result indicating a mismatch is received from the matching judgment circuit and generate an enabled signal for controlling operation of the luminance acquisition circuit after the adjustment signal is generated; and a drive circuit, configured to adjust operation of the projector in accordance with the adjustment signal output from the control circuit.