# US 12,010,465 B2 · Projection video display apparatus with variable light adjustment for multiscreen projection mode > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,010,465 B2 - Document ID: US12010465B2 - Status: Granted - Kind: B2 - Application number: 18/394,336 - Filed: 2023-12-22 - Published: 2024-04-18 - Granted: 2024-06-11 - Earliest claimed: 2018-12-10 - Assignees: Maxell, Ltd. - Applicants: Maxell, Ltd. - Inventors: Takuya Shimizu; Shinji Onodera - Web page: https://patentgrep.com/patent/US12010465B2 ## CPC - H04N 9/3147: {Multi-projection systems (video walls G06F3/1446)} - G03B 21/2006: {characterised by the light source} - G03B 21/206: {Control of light source other than position or intensity} - G06F 3/0482: Interaction with lists of selectable items, e.g. menus - H04N 9/3155: {for controlling the light source (light source control per se H05B35/00 – H05B47/00; control of an illumination source for displays in general G09G3/3406)} - H04N 9/3182: {Colour adjustment, e.g. white balance, shading or gamut (white balance per se H04N9/73; control of amplitude of colour signals H04N9/68; colour control circuits for displays in general G09G5/02, G09G3/2003, G09G3/3607)} - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION - 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) - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) ## Abstract A projection video display apparatus includes a video input unit, a light source, a display element, a projection optical system, and a variable light adjusting function which changes the amount of light incident on the display element. Display modes using the variable light adjusting function are prepared, and one display mode of the display modes can be selected from a menu screen. Further, the display modes of the display video using the variable light adjusting function includes: a first display mode where the input video is displayed while changing a light adjusting amount in accordance with light adjusting control information, which is input from external equipment and is capable of controlling the variable light adjusting function in unit of frame of a projected video; and a second display mode where the input video is displayed while changing a light adjusting amount in accordance with the input video. ## Claims ### Claim 1 A projection video display apparatus with variable light adjustment for multi-screen projection mode, comprising: a video input interface configured to input an input video; a light source; a display panel configured to allow incidence of light generated by the light source thereon and to make the light pass therethrough or reflect thereon; a projection optical system configured to project the light from the display panel as a display video; a communication interface configured to communicate with another projection video display apparatus; and a controller configured to execute at least two types of variable light adjusting controls, the two types of variable light adjusting controls including a first variable light adjusting control to adjust brightness of the light source, and a second variable light adjusting control to adjust a light amount of the optical system mechanically, the light amount being varied by moving or rotating a mechanism in the projection video display apparatus in the second variable light adjusting control, wherein a plurality of display modes controlled by the controller are prepared and one display mode of the plurality of display modes can be selected based on a menu screen operation, wherein the plurality of display modes of the display video controlled by the controller include: a first display mode which corresponds to the multi-screen projection mode, in the multi-screen projection mode where a plurality of projection video display apparatuses, including the projection video display apparatus and the another projection video display apparatus, projects display videos to be combined as one video, the controller is configured to execute the first variable light adjusting control based on first control information which is transmitted from the another projection video display apparatus and received by the communication interface, so as to make the first variable light adjusting control in the projection video display apparatus inter-locked with variable light adjusting control of adjusting brightness of a light source of the another projection video display apparatus, and the controller is configured to execute the second variable light adjusting control based on second control information which is transmitted from the another projection video display apparatus and received by the communication interface, so as to make the second variable light adjusting control in the projection video display apparatus inter-locked with variable light adjusting control of adjusting a light amount of an optical system mechanically by moving or rotating a mechanism in the another projection video display apparatus; and a second display mode where the controller is configured to make neither the first variable light adjusting control nor the second variable light adjusting control interlocked with any one of variable light adjusting controls of the another projection video display apparatus. ### Claim 2 (depends on 1) The projection video display apparatus according to claim 1, wherein the plurality of display modes controlled by the controller further include a display mode where the controller turns off the variable light adjusting controls. ### Claim 3 (depends on 1) The projection video display apparatus according to claim 1, further comprising: an image quality adjusting processor capable of performing first image quality adjustment processing which uniformly affects the entire input video and second image quality adjustment processing in which image quality adjustment to the input video locally differs, the second image quality adjustment processing is partial contrast control processing or Retinex processing which is different from brightness control for blending overlapping portion of multi-screen projection, wherein, in the first display mode, there is a state where execution of the first image quality adjustment processing is permitted and execution of the second image quality adjustment processing is prohibited. ### Claim 4 (depends on 3) The projection video display apparatus according to claim 3, wherein, in the second display mode, there is a state where both the execution of the first image quality adjustment processing and the execution of the second Image quality adjustment processing are permitted. ### Claim 5 (depends on 1) The projection video display apparatus according to claim 1, further comprising: a memory stores programs for the first variable light adjusting control and the second variable light adjusting control. ### Claim 6 (depends on 1) The projection video display apparatus, according to claim 1, wherein the first control information and the second control information which are received by the communication interface, are transmitted via daisy chain connection among the plurality of the projection video display apparatuses. ### Claim 7 A projection video display apparatus with variable light adjustment for multi-screen projection mode, comprising: a video input interface configured to input an input video; a light source; a display panel configured to allow incidence of light generated by the light source thereon and to make the light pass therethrough or reflect thereon; a projection optical system configured to project the light from the display panel as a display video; a communication interface configured to communicate with another projection video display apparatus; and a controller configured to execute at least two types of variable light adjusting controls, the two types of variable light adjusting controls including a first variable light adjusting control to adjust brightness of the light source, and a second variable light adjusting control to adjust a light amount of the optical system mechanically, the light amount being varied by moving or rotating a mechanism in the projection video display apparatus in the second variable light adjusting control, wherein a plurality of display modes controlled by the controller are prepared and one display mode of the plurality of display modes can be selected based on a menu screen operation, wherein the plurality of display modes of the display video controlled by the controller include a display mode, which corresponds to the multi-screen projection mode, in the multi-screen projection mode where a plurality of projection video display apparatuses, including the projection video display apparatus and the another projection video display apparatus, projects display videos to be combined as one video, the communication interface is configured to transmit first control information to the another projection video display apparatus, for making variable light adjusting control of adjusting brightness of a light source of the another projection video display apparatus inter-locked with the first variable light adjusting control in the projection video display apparatus, and the communication interface is configured to transmit second control information to the another projection video display apparatus, for making variable light adjusting control of adjusting a light amount of an optical system mechanically by moving or rotating a mechanism in the another projection video display apparatus, inter-locked with the second variable light adjusting control in the projection video display apparatus. ### Claim 8 (depends on 7) The projection video display apparatus according to claim 7, wherein the plurality of display modes controlled by the controller further include a display mode where the controller turns off the variable light adjusting controls. ### Claim 9 (depends on 7) The projection video display apparatus according to claim 7, further comprising: an image quality adjusting processor configured to perform first image quality adjustment processing which uniformly affects the entire input video and second image quality adjustment processing in which image quality adjustment to the input video locally differs, the second image quality adjustment processing is partial contrast control processing or Retinex processing which is different from brightness control for blending overlapping portion of multi-screen projection, wherein, in the display mode, there is a state where execution of the first image quality adjustment processing is permitted and execution of the second image quality adjustment processing is prohibited. ### Claim 10 (depends on 8) The projection video display apparatus according to claim 8, further comprising: an image quality adjusting processor configured to perform first image quality adjustment processing which uniformly affects the entire input video and second image quality adjustment processing in which image quality adjustment to the input video locally differs, the second image quality adjustment processing is partial contrast control processing or Retinex processing which is different from brightness control for blending overlapping portion of multi-screen projection, wherein, in said another display mode, there is a state where both the execution of the first image quality adjustment processing and the execution of the second image quality adjustment processing are permitted. ### Claim 11 (depends on 7) The projection video display apparatus according to claim 7, further comprising: a memory stores programs for the first variable light adjusting control and the second variable light adjusting control. ### Claim 12 (depends on 7) The projection video display apparatus, according to claim 7, wherein the first control information and the second control information are to be transmitted via daisy chain connection among the plurality of projection video display apparatuses.