# US 7,128,420 B2 · Image projecting device and method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,128,420 B2 - Document ID: US7128420B2 - Status: Granted - Kind: B2 - Application number: 10/482,928 - Filed: 2002-07-08 - Published: 2004-12-02 - Granted: 2006-10-31 - Earliest claimed: 2002-07-08 - Assignees: Explay Ltd. - Inventors: Yuval Kapellner; Sharon Kapellner; Itzhak Pomerantz; Zeev Zalevsky; Eran Sabo - Web page: https://patentgrep.com/patent/US7128420B2 ## CPC - H04N 9/3129: {scanning a light beam on the display screen (scanning a light beam on a screen in displays other than projection devices G09G3/02; scanning systems in general G02B26/10; projectors using laser light sources in general H04N9/3161)} - H04N 5/7416: {involving the use of a spatial light modulator, e.g. a light valve, controlled by a video signal} - H04N 9/315: {Modulator illumination systems (general applications of lighting devices F21V; general optical systems G02B; lamp houses for projectors not peculiar to the presence of an electronic spatial light modulator G03B21/20)} - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract An image projecting device is presented. The device comprises an SLM pixel arrangement; and two lens arrays. The lens arrays are respectively located at opposite surfaces of the SLM pixel arrangement and are integral with the SLM pixel arrangement, forming together with the SLM pixel arrangement a common SLM unit. Each lens in one array and a respective opposite lens in the other array are associated with a corresponding one of the pixels. Each of the lens arrays is implemented in a polymer spacer and is either spaced from the corresponding surface of the opposite surfaces of the pixel arrangement a distance substantially not exceeding 50 μm or is in physical contact with the respective surface. The device also comprises a light source system operable to produce an incident light beam of a predetermined cross section corresponding to the size of an active surface of the SLM pixel arrangement; and a magnification optics. ## Claims ### Claim 1 An image projecting device comprising: a spatial light modulating (SLM) pixel arrangement having a pixel pitch substantially not exceeding 50 μm and defining an active surface; first and second lens arrays respectively located at opposite surfaces of said SLM pixel arrangement and being integral with said SLM pixel arrangement forming together with said SLM pixel arrangement a common SLM unit, such that each lens in the first array and a respective opposite lens in the second array are associated with a corresponding one of the pixels, each of said first and second lens arrays being implemented in a polymer spacer and each being either spaced from the respective surface of the opposite surfaces of the pixel arrangement a predetermined distance or being in physical contact with said respective surface; a light source system (LSS) operable to produce an incident light beam of a predetermined cross section corresponding to the size of said active surface; and a magnification optics accommodated at the output side of the SLM pixel arrangement. ### Claim 2 (depends on 1) The device according to claim 1, wherein the distance between the lens array and the respective surface of the SLM pixel arrangement substantially does not exceed 50 μm. ### Claim 3 An image projecting device comprising: a spatial light modulating (SLM) pixel arrangement defining an active surface; first and second lens arrays respectively located at opposite surfaces of said SLM pixel arrangement and being integral with said SLM pixel arrangement, forming together with said SLM pixel arrangement a common SLM unit, such that each lens in the first array and a respective opposite lens in the second array are associated with a corresponding one of the pixels, each of said first and second lens arrays being implemented in a polymer spacer and each being either spaced from the respective surface of the opposite surfaces of the pixel arrangement a distance substantially not exceeding 50 μm or being in physical contact with said respective surface; a light source system (LSS) operable to produce an incident light beam of a predetermined cross section corresponding to the size of said active surface; and a magnification optics accommodated at the output side of the SLM pixel arrangement. ### Claim 4 (depends on 3) The device according to claim 3, wherein the SLM pixel arrangement comprises light modulating material defining said active surface. ### Claim 5 (depends on 3) The device according to claim 3, wherein the incident light impinging on to the SLM unit is specifically polarized, the device comprising a polarizer unit accommodated at the output side of the SLM pixel arrangement and having a preferred orientation of a plane of polarization so as to be either substantially the same as of the incident light beam or a 90-degree rotated with respect to that of the incident light beam. ### Claim 6 (depends on 5) The device according to claim 5, wherein the light source system includes a high-ratio polarized light source for generating the polarized incident light. ### Claim 7 (depends on 5) The device according to claim 5, comprising an input polarizer at the input side of the SLM pixel arrangement. ### Claim 8 (depends on 5) The device according to claim 5, wherein said polarizer unit is constituted by the surface of wearable glasses capable of imitating a three-dimensional image. ### Claim 9 (depends on 3) The device according to claim 3, wherein the light source system comprises an optical arrangement operable to provide substantially uniform intensity distribution within the cross-section of the incident light beam. ### Claim 10 (depends on 9) The device according to claim 9, wherein said optical arrangement includes a diffractive element operable to modify the beam intensity distribution to produce the substantially uniform intensity distribution of the beam within its cross-section. ### Claim 11 (depends on 3) The device according to claim 3 wherein the light source system includes a beam expander affecting the cross section of a light beam generated by the light source to provide the cross section of the beam substantially of the size of the active surface of the SLM unit. ### Claim 12 (depends on 3) The device according to claim 3, wherein the light source system includes a light source generating a light beam of the cross section substantially of the size of the active surface of the SLM unit. ### Claim 13 (depends on 3) The device according to claim 3, comprising an image processor system operable to carry out at least one of the following: (i) applying digital processing to data indicative of an image to be projected so as to avoid or at least significantly reduce the speckles associated effects in the projected image; (ii) processing data indicative of the projected image to correct for non-uniformities in the light intensity; and (iii) analyzing data indicative of the environmental condition to adjust at least one of the intensity and color mixture of the incident light beam. ### Claim 14 (depends on 13) The device according to claim 13, comprising an image recorder operable to generate the data indicative of the projected image and transmit said data to the image processor system. ### Claim 15 (depends on 13) The device according to claim 13, comprising an environment sensor operable to generate the data indicative of the environment condition and transmit said data to the image processor system. ### Claim 16 (depends on 3) The device according to claim 3, comprising a modulation driver responsive to an imaging signal representative of an image to be projected, to generate modulation signals to the SLM pixel arrangement. ### Claim 17 (depends on 16) The device according to claim 16, wherein said modulation driver is connectable to an image processor system to receive therefrom said imaging signal. ### Claim 18 (depends on 3) The device according to claim 3, comprising a time modulator associated with said SLM pixel arrangement and operable to apply time modulation to different light components of the light source system. ### Claim 19 (depends on 18) The device according to claim 18, wherein said different light components are different color components. ### Claim 20 (depends on 19) The device according to claim 19, wherein said different color components are formed by a combination of highly polarized and non-polarized light. ### Claim 21 (depends on 20) The device according to claim 20, wherein the light source system includes at least one laser source for generating polarized light, and at least one light emitting diode for generating non-polarized light. ### Claim 22 (depends on 3) The device according to claim 3, wherein the light source system generates spatially separated different-color light components, the device comprising additional SLM pixel arrangements, each arrangement being associated with the corresponding one of the color light components. ### Claim 23 (depends on 3) The device according to claim 3, comprising a rotating mirror accommodated in front of a projecting surface, the device thereby enabling creation of a stereoscopic image. ### Claim 24 (depends on 3) A projecting system comprising at least two projecting devices, each constructed according to claim 3. ### Claim 25 (depends on 24) The system according to claim 24, comprising a control unit connectable to each of the projecting devices and operable to enable creation of a large combined image on a projecting surface formed by images created by the projecting devices. ### Claim 26 (depends on 25) The system according to claim 25, wherein said projecting surface is concave. ### Claim 27 (depends on 3) The device according to claim 3, wherein said light source system comprises at least one coherent light source. ### Claim 28 A computer system operable to generate data to be imaged, the system comprising an image projecting device connected to a data generating utility of the computer system and operating to project the image onto at least one external projecting surface, said image projecting device comprising: a spatial light modulating (SLM) pixel arrangement defining an active surface; first and second lens arrays respectively located at opposite surfaces of said SLM pixel arrangement and being integral with said SLM pixel arrangement forming together with said SLM pixel arrangement a common SLM unit, such that each lens in the first array and a respective opposite lens in the second array are associated with a corresponding one of the pixels, each of said first and second lens arrays being implemented in a polymer spacer and each being either spaced from the respective surface of the opposite surfaces of the pixel arrangement a predetermined distance or being in physical contact with said respective surface; a light source system (LSS) operable to produce an incident light beam of a predetermined cross section corresponding to the size of said active surface; a magnification optics accommodated at the output side of the SLM pixel arrangement. ### Claim 29 A method for projecting an image comprising: (i) providing a spatial light modulator (SLM) unit comprising an SLM pixel arrangement having a pixel pitch substantially not exceeding 50 μm and defining an active surface; and first and second lens arrays located at opposite surfaces of said SLM pixel arrangement and being integral with said SLM pixel arrangement, such that each lens in the first array and a respective opposite lens in the second array are associated with a corresponding one of the pixels, each of said first and second lens arrays being implemented in a polymer spacer and being either spaced from the respective surface of the pixel arrangement a predetermined distance or being in physical contact with said respective surface; (ii) creating an incident light beam having a predetermined cross section corresponding to a size of said active surface defined by the SLM pixel arrangement; (iii) passing said light through the SLM unit and concurrently operating the SLM pixel arrangement with an imaging signal representative of an image to be projected to thereby produce modulated light; (iv) passing the modulated light emerging from the SLM unit through a magnifying optics to be projected onto a projecting surface. ### Claim 30 A method for projecting an image comprising: (i) providing a spatial light modulator (SLM) unit comprising: a spatial light modulating (SLM) pixel arrangement defining an active surface; and first and second lens arrays located at opposite surfaces of said SLM pixel arrangement and being integral with said SLM pixel arrangement, such that each lens in the first array and a respective opposite lens in the second array are associated with a corresponding one of the pixels, each of said first and second lens arrays being implemented in a polymer spacer and each being either spaced from the respective surface of the opposite surfaces of the SLM pixel arrangement a predetermined distance substantially not exceeding 50 μm or being in physical contact with said respective surface; (ii) creating an incident light beam having a predetermined cross section corresponding to a size of said active surface defined by the SLM pixel arrangement; (iii) passing said light through the SLM unit and concurrently operating the SLM pixel arrangement with an imaging signal representative of an image to be projected to thereby produce modulated light; (iv) passing the modulated light emerging from the SLM unit through a magnifying optics to be projected onto a projecting surface. ### Claim 31 (depends on 30) The method according to claim 30, comprising providing specific polarization of the incident light beam propagating towards the SLM pixel arrangement, and passing the modulated light, propagating towards the projecting surface, through a polarizer having a preferred orientation of a plane of polarization either substantially the same as that of the incident light beam or a 90-degree rotated with respect to that of the incident light beam. ### Claim 32 (depends on 31) The method according to claim 31, comprising passing the randomly polarized light beam generated by a light source through a polarizer accommodated at the input side of the SLM pixel arrangement. ### Claim 33 (depends on 31) The method according to claim 31, wherein the incident light beam is created by a high-ratio polarization light source. ### Claim 34 (depends on 30) The method according to claim 30, wherein the incident light beam is created by a light source emitting a light beam with a cross section substantially of the size of the active surface of the SLM pixel arrangement. ### Claim 35 (depends on 30) The method according to claim 30, wherein the creation of incident light beam comprises passage of a light beam emitted by a light source through a beam shaping optics to thereby produce the incident light beam of the predetermined cross section. ### Claim 36 (depends on 30) The method according to claim 30, wherein the distance between the lens array and the respective surface of the SLM pixel arrangement substantially does not exceed 50 μm. ### Claim 37 (depends on 30) The method according to claim 30, comprising providing specific polarization of the incident light beam propagating towards the SLM pixel arrangement, and passing the modulated light, propagating towards the projecting surface, through a polarizer having a preferred orientation of a plane of polarization either substantially the same as that of the incident light beam or a 90-degree rotated with respect to that of the incident light beam. ### Claim 38 (depends on 37) The method according to claim 37, comprising passing the randomly polarized light beam generated by a light source through a polarizer accommodated at the input side of the SLM pixel arrangement. ### Claim 39 (depends on 37) The method according to claim 37, wherein the incident light beam is created by a high-ratio polarization light source. ### Claim 40 A method for projecting an image comprising: (i) providing a spatial light modulator (SLM) unit comprising: a spatial light modulating (SLM) pixel arrangement defining an active surface; and first and second lens arrays respectively located at opposite surfaces of said SLM pixel arrangement and being integral with said SLM pixel arrangement, such that each lens in the first array and a respective opposite lens in the second array are associated with a corresponding one of the pixels, each of said first and second lens arrays being implemented in a polymer spacer and each being either spaced from the respective surface of the opposite surfaces of the SLM pixel arrangement a predetermined distance or being in physical contact with said respective surface; (ii) creating an incident light beam having a predetermined cross section corresponding to a size of said active surface defined by the SLM pixel arrangement; (iii) passing said light through the SLM unit and concurrently operating the SLM pixel arrangement with an imaging signal representative of an image to be projected to thereby produce modulated light; (iv) passing the modulated light emerging from the SLM unit through a magnifying optics to be projected onto a projecting surface; (v) processing said imaging signal prior to operating thereby the SLM pixel arrangement, to apply digital jittering and gray level processing of pixels, thereby enabling reduction of speckles' effects in the projected image. ### Claim 41 A method for projecting an image comprising: (i) providing a spatial light modulator (SLM) unit comprising: a spatial light modulating (SLM) pixel arrangement defining an active surface; and first and second lens arrays respectively located at opposite surfaces of said SLM pixel arrangement and being integral with said SLM pixel arrangement, such that each lens in the first array and a respective opposite lens in the second array are associated with a corresponding one of the pixels, each of said first and second lens arrays being implemented in a polymer spacer and each being either spaced from the respective surface of the opposite surfaces of the SLM pixel arrangement a predetermined distance or being in physical contact with said respective surface; (ii) creating an incident light beam having a predetermined cross section corresponding to a size of said active surface defined by the SLM pixel arrangement; (iii) passing said light through the SLM unit and concurrently operating the SLM pixel arrangement with an imaging signal representative of an image to be projected to thereby produce modulated light; (iv) passing the modulated light emerging from the SLM unit through a magnifying optics to be projected onto a projecting surface; (v) obtaining data indicative of the projected image, analyzing said data and processing said imaging signal prior to operating thereby the SLM pixel arrangement, to thereby provide substantially uniform intensity within the projected image. ### Claim 42 A method for projecting an image comprising: (i) providing a spatial light modulator (SLM) unit comprising: a spatial light modulating (SLM) pixel arrangement defining an active surface; and first and second lens arrays respectively located at opposite surfaces of said SLM pixel arrangement and being integral with said SLM pixel arrangement, such that each lens in the first array and a respective opposite lens in the second array are associated with a corresponding one of the pixels, each of said first and second lens arrays being implemented in a polymer spacer and each being either spaced from the respective surface of the opposite surfaces of the SLM pixel arrangement a predetermined distance or being in physical contact with said respective surface; (ii) creating an incident light beam having a predetermined cross section corresponding to a size of said active surface defined by the SLM pixel arrangement; (iii) passing said light through the SLM unit and concurrently operating the SLM pixel arrangement with an imaging signal representative of an image to be projected to thereby produce modulated light; (iv) passing the modulated light emerging from the SLM unit through a magnifying optics to be projected onto a projecting surface; (v) obtaining data indicative of an environment condition, analyzing said data, and processing said imaging signal prior to operating thereby the SLM pixel arrangement, to thereby adjust at least one of the intensity and color mixture of the modulated light forming the projected image.