201237540 雷射投影器ίο 雷射光源11 雷射光束110、111 成像光束112 合光模組12 影像產生元件13 出光口 14 屏幕20 相位干擾元件30 相位干擾圖案31 五、 本案若有化學式時，請揭示最能顯示發明特徵的化學式： (無） 六、 發明說明： 【發明所屬之技術領域】 本發明係有關一種雷射光斑抑制裝置及其抑制方法供 應用於雷射投影系統中，尤指一種在雷射光源與屏幕之間 的雷射光束投射路徑上設置至少一雷射光相位干擾元件， 以使以反射方式或穿透方式經過該相位干擾元件的雷射光 束產生不均勻之空間相位變化，並使最後自屏幕出射之影 像晝面之成像光之光束截面之相干長度縮小，而達成抑制 雷射光斑的效果。 【先前技術】 請參考圖1及圖2所示，習用一雷射投影系統1 一般 包含一雷射投影器10及至少一屏幕20但不限制，其中該 雷射投影器10主要包含：至少一雷射光源11如分別之R (紅色）、G (綠色）、B (藍色）三色雷射光源但不限制供 出射雷射光束110如R (紅色）、G (綠色）、B (藍色）等 三色雷射光110 ; —合光模組12但不限制供可將前述之三 2/22 201237540 色雷射光110組成一雷射光束1Π;及至少一影像產生元件 13供將雷射光束形成成像光束112並由該雷射投影器1〇 之機殼上至少一出光口 101向外投射至該屏幕20上以形成 影像畫面。該影像產生元件13可依不同之成像方式概分為 兩種型態，一是使用光束偏折裝置如圖1所示，如：反射 鏡、微機電反射鏡（Micro-Electronic Mechanical System vibratiom Mirror’ 簡稱 MEMS mirror)、多角反射鏡(p〇iyg〇n mirror)、超音波光柵（ultrasonic grating)中之一種或其組合 但不限制’而此種型態雷射投影器10 —般係設計包/含：三 雷射光源模組、一雷射訊號調變模組、一合光模組、一旋 轉平面鏡模組、一旋轉平面鏡控制模組及一訊號轉換模組 但不限制；另一是使用二維光亮度調整陣列如圖2所示， 如：DLP (Digital Light Processor，數位光線處理器）、LC〇s (Liquid Crystal On Silicon ’矽基液晶）顯像裝置、全 像（Hologram)顯像裝置中之一種但不限制。由於本發明主 要疋針對一雷射投影系統1提供一雷射光斑抑制裝置及其 抑制方法’因此圖1及圖2僅用以表示一雷射投影年統1 中雷射投影器10及屏幕20之兩種不同架構，至於^雷射 投影為10之詳細結構及其成像方式的相關技術，如該影像 產生元件13之成像方式及其技術等，在此不另作詳細說 雷射光束具有本質上良好的同調性（c〇herent)，1 長一致、相位一致、單一頻率且導向性佳的高能量光'束^ 當其被應用為雷射投影器的光源時，將會伴隨產生雷 斑（laser speckle)現象。雷射光斑乃是同調性 粗链表面上，如-投影用屏幕2〇或—半透明擴則反射= 成之不規則顆粒狀㊉度分佈，其起因為散射光在不同點 粗才造表面而產生不規則的建設性或破壞性干涉。 亮者乃是建設性干涉所造成；光強度較暗者乃是破G 涉的結果；雷射光《導致^彡影像的高度空間頻率干g 201237540 (spatial frequency n〇ise)問題，以人眼 留影響，這些來自投影屏幕上不同顆粒 斑’即是對雷射投影影像觀賞上的最。日放亂陡光 方法針= ί = 解決的 如馬達以驅使屏幕2 〇不斷地移動或轉自^ 的同調性而減低干涉現象;或如我國發明公開第 说’其係利用透鏡將-影像產生模組所產生的影像聚焦於 可移動或轉動的-可隨時間變更擴散器（Time_ ;哗、、 Diffuser)上，以破壞雷射光的同調性’而緩和影 I匕 的雷^斑點現象’其原理係以高頻率的震動，造成^位差 K二1=5眼後不易察覺微小光點間的明暗 将刹用㈣舰'肖除雷射光斑。然’前述裝置或方法皆 係利用制動機構以驅動屏幕20或擴制（ 雷射光產生移動或轉動’因此整體機構較 為複雜’產4作成本也相對提高，且體積相對較大，不 利於該雷射投影器10之輕薄短小之設計要求。 另，尚有其他業者提出解決雷射斑點的設備，如美國 τι公司之旋轉折射設備(refracting心⑹whh她邮），美 國MiCr〇vis,i〇n公司之光學反饋設備（optical feedback d^aces)’吴國C〇rning&司之週期階段遮蔽物㈣滅c201237540 Laser projector ίο Laser source 11 Laser beam 110, 111 Imaging beam 112 Convergence module 12 Image generation component 13 Light exit port 14 Screen 20 Phase interference component 30 Phase interference pattern 31 5. If there is a chemical formula in this case, please The invention discloses a chemical formula which can best display the characteristics of the invention: (None) 6. Description of the Invention: The present invention relates to a laser spot suppression device and a suppression method thereof for use in a laser projection system, in particular, a Locating at least one laser light phase interference component on a laser beam projection path between the laser source and the screen to cause an uneven spatial phase change of the laser beam passing through the phase interference element in a reflective manner or in a penetrating manner, The effect of suppressing the laser spot is achieved by reducing the coherence length of the beam cross section of the imaging light that is finally emitted from the screen. [Prior Art] Referring to FIG. 1 and FIG. 2, a conventional laser projection system 1 generally includes a laser projector 10 and at least one screen 20, but is not limited thereto, wherein the laser projector 10 mainly includes: at least one The laser light source 11 is a three-color laser light source of R (red), G (green), and B (blue), respectively, but does not limit the supply of the laser beam 110 such as R (red), G (green), and B (blue). Color) and other three-color laser light 110; - light combining module 12, but not limited to provide the foregoing three 2/22 201237540 color laser light 110 to form a laser beam 1 Π; and at least one image generating element 13 for laser The beam forms an imaging beam 112 and is projected outwardly from the at least one exit port 101 of the housing of the laser projector 1 to the screen 20 to form an image frame. The image generating component 13 can be divided into two types according to different imaging modes. One is to use a beam deflecting device as shown in FIG. 1, such as a mirror, a micro-electron mirror (Micro-Electronic Mechanical System vibratiom Mirror' Referred to as MEMS mirror), polygon mirror (p〇iyg〇n mirror), ultrasonic grating (ultrasonic grating) or a combination thereof, but not limited to 'this type of laser projector 10 general design package / Including: three laser light source module, one laser signal modulation module, one light module, one rotating plane mirror module, one rotating plane mirror control module and one signal conversion module but not limited; the other is to use The two-dimensional brightness adjustment array is shown in Figure 2, such as: DLP (Digital Light Processor), LC〇s (Liquid Crystal On Silicon), and Hologram imaging. One of the devices is not limited. Since the present invention mainly provides a laser spot suppression device for a laser projection system 1 and a suppression method thereof, FIGS. 1 and 2 are only used to represent a laser projector 10 and a screen 20 in a laser projection system 1 The two different architectures, as for the detailed structure of the laser projection of 10 and the related art of the imaging method, such as the imaging mode and the technique of the image generating component 13, etc., the details of the laser beam are not specifically described herein. Good coherence (c〇herent), a high-energy light beam with a uniform length, phase uniformity, single frequency and good directivity. When it is applied as a light source for a laser projector, it will be accompanied by a thunderstorm. (laser speckle) phenomenon. The laser spot is on the surface of the homogenous thick chain, such as - projection screen 2 〇 or - translucent expansion reflection = irregular granular tens of degrees distribution, which is caused by scattered light at different points to create the surface Generate irregular constructive or destructive interference. The brighter is caused by constructive interference; the darker light is the result of breaking the G; the laser light "causes the high spatial frequency of the image" 201237540 (spatial frequency n〇ise) problem, leaving the human eye The effect of these is that the different particle spots on the projection screen are the most visible on the laser projection image. Day-disordering steep light method pin = ί = Solving the phenomenon that the motor is used to drive the screen 2 〇 to move continuously or from the homology of ^ to reduce the interference phenomenon; or as the invention of the invention discloses that it uses the lens to image-image generation The images produced by the group are focused on moving or rotating - the diffuser can be changed over time (Time_ ; 哗, Diffuser) to destroy the homology of the laser light and to mitigate the shadow of the shadow I. With a high frequency of vibration, resulting in ^ difference K 2 1 = 5 eyes are not easy to detect the light and dark between the light spots will be used to brake the (four) ship 'Zhao Lei laser spot. However, the foregoing devices or methods use the brake mechanism to drive the screen 20 or expand (the laser light moves or rotates, so the overall mechanism is more complicated), and the cost is relatively increased, and the volume is relatively large, which is not conducive to the mine. The design requirements of the projector 10 are light and thin. In addition, there are other devices that have proposed to solve the laser spot, such as the rotating refraction device of the United States τι company (refracting heart (6) whh her post), the United States MiCr〇vis, i〇n company Optical feedback device (optical feedback d^aces) 'Wu Guo C〇rning& Division of the cycle stage shield (four) off c
Phase mask)等，其機構亦較為複雜，亦須付出較高之製作 成因此如何採行較關便且具低成本的裝置與方法， :重=2至於消除雷射光斑’是當前相關業界亟待努力 【發明内容】 本發明之主要目的係提供—種雷射投影系統之雷射光 制裝置及其抑制方法’騎射投料統包含-雷射投 如及屏幕，其中該雷射投影器包含至少一雷射光源供 4/22 201237540 射出雷射光束及至少一影像產生元件如光束偏折裝置或二 維光亮度調整陣列供將該雷射光束形成成像光束並由至少 一出光口投射至該屏幕上以形成影像晝面，該影像晝面並 自屏幕出射而由人眼接收；本發明之雷射光斑抑制裝置及 其抑制方法係利用至少一雷射光相位干擾元件，其係一具 有適€每度之；4膜狀結構體且其表面上設有至少一相位干 擾圖案如一維散亂圖案（rand〇m pattern)、一維週期性圖 案、一維散亂圖案（random pattern)、二維週期性圖案 (periodic pattern)中之一種或其組合；並將該至少一相位干 擾=件設在該雷射光源與該屏幕之間的雷射光束或成像光 束ί射路徑上’以使該雷射光束或成像光束以反射方式或 以牙透方式鉍過該相位干擾元件之相位干擾圖案時，能產 生=均勻之空間相位變化，並使最後自屏幕出射之影像畫 ^ ΐ光之光束截面之相干長度（correlation length)縮 土占Ϊ以抑制在該影像畫面上所產生之雷射光斑；其中該 相干長度係一參數，用以表示-光束截面上之 光束ί面，當該光束截面之相干長度越小時，表示該 位變化，&相位分佈在單位戴面積内產生越多而密集的相 光斑之光束戴面之相干長度越小時’則雷射 斑抑=c係提供—種雷射投影系統之雷射光 式元件時法，其中當該相位干擾元件為反射 位干样元彼μ田射光束或成像光束係以反射方式經過該相 透式$件日:擾圖案；、其中當該相位干擾元件為穿 相位干擾元彼以缉射光束或成像光束係以穿透方式經過該 化，俾S使：擾圖案，並可產生至知之相位差變 干涉變化，二田光束或成像光束產生建設性或破壞性之 本發明抑制在该影像晝面上所產生之雷射光斑。 斑抑制^ w ^ f厂目的係提供一種雷射投影系統之雷射光 裝置及其抑制方法，其巾當鄉缝生元件為光束 5/22 201237540 時如反射鏡、微機電反射鏡、多角反射鏡、超音 ，中之-種或其組合但不限制，該至少一相：干 又置在下列位置：該雷射光源與該光▲偏折裝置之間 的畐射光束投射路徑上、該光束偏折裝置之反射鏡面上， 及該光束偏折裝置與該屏幕之間的成像光束投射路徑上， 其中至少一位置上。 本發明之另一目的係提供一種雷射投^系統之雷射光 斑抑制裝置及其抑制方法，其中當該影像;^生元件為二維 光亮度調整陣列時如DLP (Digital Light Processor ’數位光 線處理③）、LCOS ( Liquid Crystal On Silicon，石夕基液晶）顯 像裝置、全像（Hologram)顯像裝置中之一謹但不限制，該 至少一相位干擾元件係設置在下列位置：該雷射光源與該 影像產生元件之間的雷射光束投射路徑上、該影像產生元 件之表面上及該影像產生元件與該屏幕之間的成像光束投 射路徑上’其中至少一位置上。 本發明之另一目的係提供一種雷射投影系統之雷射光 斑抑制裝置及其抑制方法，其中該至少一相位干擾元件進 一步可設置在該雷射投影器之出光口處’以使成像光束以 穿透方式經過該相位干擾元件之相位干擾_案再投射至該 屏幕上以形成影像晝面。 本發明之另一目的係提供一種雷射投影系統之雷射光 斑抑制裝置及其抑制方法，其中該至少一相位干擾元件進 一步可設置在該屏幕之表面上，以使影像畫面以穿透方式 經過該相位干擾元件之相位干擾圖案再由人眼接收。 本發明之另一目的係提供一種雷射投影系就之雷射光 斑抑制裝置及其抑制方法，其中當該雷射光束或成像光束 在投影至該屏幕之前經過該相位干擾圖案時，該雷射光束 或成像光束進一步可依時間之變化（以不同的時間）經過 該相位干擾圖案上之不同區域，以在人眼觀察的視覺暫留 時間内使雷射光斑之對比因時間平均而再被降低或抑制。 6/22 201237540 本發明之另一目的係提供一種雷射投影系統之雷射光 斑抑制裝置及其抑制方法，其中當該雷射光束或成像光束 在投影至該屏幕之前經過該相位干擾圖案時，該雷射光束 或成像光束進一步可依時間之變化（以不同的時間）並以 不同入射角經過該相位干擾圖案，以在人眼觀察的視覺暫 留時間内使雷射光斑之對比因時間平均而再被抑制。 本發明之另一目的係提供一種雷射投影系統之雷射光 斑抑制裝置及其抑制方法，其中該雷射光斑的抑制方法包 含下列步驟： 提供至少一雷射光相位干擾元件，其上設有至少一雷 射光相位干擾圖案，其中該雷射光相位干擾圖案係用以使 雷射光束或成像光束以反射方式或穿透方式經過該相位干 擾圖案時能產生不均勻之相位變化； 將該至少一雷射光相位干擾元件設置於該雷射光源與 該屏幕之間的投射路徑上，以使雷射光束或成像光束在投 射至該屏幕上之前能以反射或穿透方式先經過該至少一相 位干擾元件之雷射光相位干擾圖案；及 利用該雷射光相位干擾圖案，對經過該雷射光相位干 擾，案的雷射光束或成像光束產生不均勻之相位變化，並 使^後由^幕出射之影像畫面成像光之光束截面之相干長 ’藉以抑制在該影像畫面上產生雷射光斑；其中該 3f之相干長度係一參數，用以表示一光束截面上之 ΐίίΐ情形，當該光束截面之相干長度越小時，表示該 位變化，ii目位分佈在單位截面積内產生越多而密集的相 光斑之抑光束截面之相干長度越小時，則雷射 【實施方式】 置及其抑制^=對一雷射投影系統提供一雷射光斑抑制裝 '、法’而不論該雷射投影系統屬於那一種成像 7/22 201237540 明之雷射光斑抑制裝置及其 制技術架構之雷射投影系統1來說明本發明之= 丄及圖2僅用以表示-雷射投影“Phase mask), etc., its organization is also more complicated, and it has to pay a higher level of equipment and methods, so how to adopt a more convenient and low-cost device: Heavy = 2 to eliminate the laser spot is a current industry OBJECTS OF THE INVENTION The main object of the present invention is to provide a laser light-emitting device for a laser projection system and a method for suppressing the same, and a laser-projecting system includes a laser projector and a screen, wherein the laser projector includes at least one mine The light source is for 4/22 201237540 to emit a laser beam and at least one image generating component such as a beam deflecting device or a two-dimensional brightness adjusting array for forming the laser beam into an imaging beam and projecting onto the screen by at least one light exit port Forming an image plane, which is received from the screen and received by the human eye; the laser spot suppression device of the present invention and the suppression method thereof utilize at least one laser light phase interference component, and the system has a suitable degree 4 film-like structure and having at least one phase interference pattern on its surface such as a rand〇m pattern, a one-dimensional periodic pattern, and a one-dimensional scattered pattern (ra) a ndom pattern), one of a two-dimensional periodic pattern or a combination thereof; and the at least one phase interference=piece is disposed between the laser source and the screen of the laser beam or the imaging beam illuminating path When the laser beam or the imaging beam is caused to pass through the phase interference pattern of the phase interference element in a reflective manner or in a toothed manner, a spatial phase change of uniformity can be generated, and the image finally emitted from the screen can be drawn. The correlation length of the beam section of the twilight light shrinks to suppress the laser spot generated on the image frame; wherein the coherence length is a parameter indicating the beam ί surface on the beam section, When the coherence length of the beam cross section is small, it indicates that the bit changes, and the phase distribution of the beam is larger in the unit wearing area. The more the coherence length of the beam wearing surface is smaller, the smaller the coherence length is. Providing a laser light element method for a laser projection system, wherein when the phase interference element is a reflection level dry sample, the field beam or the imaging beam passes through the phase in a reflective manner a piece of material: a disturbance pattern; wherein, when the phase interference component is a phase-interference element, the illuminating beam or the imaging beam is transmitted in a penetrating manner, and the 俾S makes the pattern disturb and can be generated to the phase of knowledge. The differential interference variation, the second beam or the imaging beam is constructive or destructive, and the present invention suppresses the laser spot generated on the image plane. The plaque suppression ^ w ^ f factory aims to provide a laser projection system and a method for suppressing the same, and the towel is a mirror, a microelectromechanical mirror, a polygonal mirror when the component is a beam 5/22 201237540 , supersonic, medium, or a combination thereof, but not limited thereto, the at least one phase: dry and placed in the following position: the projection light beam between the laser light source and the light deflection device, the light beam a mirror surface of the deflecting device, and an imaging beam projection path between the beam deflecting device and the screen, at least one of the positions. Another object of the present invention is to provide a laser spot suppression device for a laser projection system and a method for suppressing the same, wherein the image is a DLP (Digital Light Processor' digital light when the component is a two-dimensional brightness adjustment array. The processing 3), the LCOS (Liquid Crystal On Silicon) developing device, and the Hologram developing device are, but are not limited to, the at least one phase interference component is disposed at the following position: the mine And at least one of the positions on the projection path of the laser beam between the source and the image generating element, the surface of the image generating element, and the imaging beam projection path between the image generating element and the screen. Another object of the present invention is to provide a laser spot suppression device for a laser projection system and a method for suppressing the same, wherein the at least one phase interference component is further disposed at a light exit of the laser projector to enable the imaging beam to The phase interference through the phase interference component of the phase interference component is projected onto the screen to form an image plane. Another object of the present invention is to provide a laser spot suppression device for a laser projection system and a method for suppressing the same, wherein the at least one phase interference component is further disposed on a surface of the screen to allow the image to pass through through the image. The phase interference pattern of the phase interference element is again received by the human eye. Another object of the present invention is to provide a laser projection suppression apparatus for a laser projection system and a method for suppressing the same, wherein the laser beam or the imaging beam passes through the phase interference pattern before being projected onto the screen, the laser The beam or imaging beam can further pass through different regions of the phase interference pattern over time (at different times) to reduce the contrast of the laser spot by time averaging during the visual pause time observed by the human eye. Or inhibit. 6/22 201237540 Another object of the present invention is to provide a laser spot suppression device for a laser projection system and a method for suppressing the same, wherein when the laser beam or the imaging beam passes the phase interference pattern before being projected onto the screen, The laser beam or the imaging beam can be further changed in time (at different times) and at different angles of incidence through the phase interference pattern to cause the laser spot to be compared by time average during the visual retention time observed by the human eye. And then suppressed. Another object of the present invention is to provide a laser spot suppression device for a laser projection system and a method for suppressing the same, wherein the laser spot suppression method comprises the following steps: providing at least one laser light phase interference component, at least a laser light phase interference pattern, wherein the laser light phase interference pattern is used to generate a non-uniform phase change when the laser beam or the imaging beam passes through the phase interference pattern in a reflective manner or in a penetrating manner; The light-emitting phase interference component is disposed on a projection path between the laser light source and the screen, so that the laser beam or the imaging beam can pass through the at least one phase interference component in a reflective or transparent manner before being projected onto the screen. a laser light phase interference pattern; and using the laser light phase interference pattern to generate an uneven phase change of the laser beam or the imaging beam through the phase interference of the laser light, and causing the image of the image to be emitted by the screen The coherence length of the beam section of the imaging light is used to suppress the generation of a laser spot on the image frame; wherein the 3f The coherence length is a parameter used to represent the ΐίίΐ case on a beam cross section. When the coherence length of the beam cross section is small, it indicates the change of the bit, and the ii target distribution produces more dense phase spots in the unit cross-sectional area. The smaller the coherence length of the beam cross section is, the laser [Embodiment] and its suppression ^= provide a laser spot suppression device ', method' for a laser projection system regardless of the type of imaging of the laser projection system 7/22 201237540 The laser spot suppression device of the invention and the laser projection system 1 of the technical architecture thereof are used to illustrate the invention = and FIG. 2 is only used to represent - laser projection "
=a G及屏幕2g之兩種不同架構，非用以限制I 〈苐1實施例> ^參考圖3 ’其係本發明應用於圖i所示雷射投影 之一實施例示意®。該諸投料統1個以說明本發明之 技術特徵但非用以限制本發明。該雷射投影系統i如圖 不，包含一雷射投影器10及一屏幕2〇，其中該雷射投影器 1〇f要包含至少一雷射光源11供射出*射光束110及至少 一影像產生元件13，其中在該雷射光源丨丨與該影像產生元 件13之間亦可設一合光模組12但不限制供可將該雷射光 110組成一雷射光束πι。在本實施例中該影像產生元件13 為一光束偏折裝置如反射鏡、一維或二維微機電反射鏡（ MEMS mirror)、多角反射鏡(p〇iyg〇n mirror)、超音波光栅 (ultrasonic grating)中之一種或其組合但不限制，供將雷射 光束110或111形成，如掃描形成，成像光束112 ;該成像光 束112再由至少一出光口 14投射至一屏幕20上以形成影像 畫面，該影像晝面再自該屏幕20出射..而由人眼接收。 本實施例之雷射光斑抑制裝置3係利用至少一雷射光 相位干擾元件30設在該雷射光源11與該屏幕20之間該雷射 光束110、111或成像光束112之投射路徑上，以供該雷射光 束110、111或成像光束112經過。 該相位干擾元件3 0係一具有適當厚度之薄膜狀結構體 ，其表面設有至少一相位干擾圖案31，該至少一相位干擾 圖案可為一維散亂圖案(random pattern)如圖4所示、一維 週期性圖案如圖5所示、二維散亂圖案（random pattern)、二 8/22 201237540 維週期性圖案（periodic pattern)中之一種或其組合，如可利 用兩個相位干擾元件30而其上各設一單方向相位干擾圖案 31 ’以使該兩個相位干擾元件3〇的組合應用仍可達成一二 維散亂圖案（random pattern)或一二維週期性圖案(peri〇dic pattern)的作用功能。該相位干擾圖案3i[如圖4、5所示， 可以濺鍍鋁薄膜方式或蝕刻方式以形成於該相位半擾元件 3 0之表面上。 該相位干擾圖案31所具有之表面相干長度，以pr表 示’係小於入射於該相位干擾圖案31之雷射光束11〇、ill 或112之直徑’其中該雷射光束11〇、hi及112芝直徑之 定義為該直徑定義之圓可包含雷射光束99%之能量。 又該松位干擾圖案31所具有之表面相干長度（pr)係 小於該雷射投影系統1中該雷射光束110、111或成像光束 112在其投射路徑上所經過之任一表面所具有之表面相干 長度（correlation length) ’該任一表面包含如圖3:中所示 微機電反射鏡（MEMS mirror) (13)之反射鏡面。其中該 相干長度係一用以界定一分佈（distribution)狀態之變化 頻率情形的參數；該表面相干長度，在此以Pr代表，係用 以表示一表面粗糙度之高度變化頻率情形，定義為二維圖 案表面高度變化在空間中的自我相關函數 D(R)(autocorrelation function)之高斯分佈函數（Gaussian distribution)之係數： D(R) = exp(-其中R代表空間中的距離；其中當該表面相干長度越小 時，表不該表面粗f造分佈在早位長度内越多而密集，則雷 射光斑之抑制的效果越好。關於粗糙表面之相干長度 (correlation length)定義可參考 J.A Ogilvy 之、、Theory of Waves scattering from random rough surfaces^ ； Petry 9/22 201237540Two different architectures, =a G and screen 2g, are not intended to limit I < 苐 1 embodiment> ^ Referring to Figure 3', the present invention is applied to an embodiment of the laser projection shown in Figure i. The materials are described to illustrate the technical features of the present invention but are not intended to limit the present invention. The laser projection system i includes a laser projector 10 and a screen 2 〇, wherein the laser projector 1 〇f includes at least one laser light source 11 for emitting the *beam 110 and at least one image. The component 13 is generated, and a light combining module 12 may be disposed between the laser light source 丨丨 and the image generating component 13 but is not limited to form the laser beam 110 into a laser beam πι. In this embodiment, the image generating component 13 is a beam deflecting device such as a mirror, a one-dimensional or two-dimensional microelectromechanical mirror (MEMS mirror), a polygonal mirror (p〇iyg〇n mirror), and an ultrasonic grating ( One or a combination of the laser gratings, but not limited to, for forming a laser beam 110 or 111, such as a scanning, imaging beam 112; the imaging beam 112 is again projected by at least one light exit 14 onto a screen 20 to form The image frame, which is then emitted from the screen 20 and received by the human eye. The laser spot suppression device 3 of the present embodiment uses at least one laser light phase interference component 30 to be disposed on the projection path of the laser beam 110, 111 or the imaging beam 112 between the laser light source 11 and the screen 20, The laser beam 110, 111 or imaging beam 112 is passed through. The phase interference component 30 is a film-like structure having a suitable thickness, and the surface is provided with at least one phase interference pattern 31, and the at least one phase interference pattern may be a one-dimensional random pattern as shown in FIG. The one-dimensional periodic pattern is as shown in FIG. 5, one of a two-dimensional random pattern, and one or a combination of two or more periodic patterns, such as two phase interference elements. 30, wherein a single-direction phase interference pattern 31' is disposed thereon so that the combined application of the two phase interference elements 3〇 can still achieve a two-dimensional random pattern or a two-dimensional periodic pattern (peri〇) The function of dic pattern). The phase interference pattern 3i [shown in Figs. 4 and 5 can be formed by sputtering an aluminum thin film or etching method on the surface of the phase half-disturbing element 30. The surface coherence pattern 31 has a surface coherence length, denoted by pr, which is smaller than the diameter of the laser beam 11 〇, ill or 112 incident on the phase interference pattern 31, wherein the laser beam 11 hi, hi, and 112 芝The diameter is defined as the circle defined by the diameter that can contain 99% of the energy of the laser beam. Moreover, the loose interference pattern 31 has a surface coherence length (pr) which is smaller than any surface of the laser projection system 1 in which the laser beam 110, 111 or the imaging beam 112 passes over its projection path. Surface Correlation Length 'This surface contains the mirror surface of the MEMS mirror (13) as shown in Figure 3: Wherein the coherence length is a parameter for defining a frequency of change of a distribution state; the surface coherence length, represented by Pr, is used to represent a height variation frequency of a surface roughness, defined as two The coefficient of the Gaussian distribution of the autocorrelation function in the space: D(R) = exp(- where R represents the distance in space; The smaller the surface coherence length is, the more dense and dense the surface is distributed in the early length, the better the suppression of the laser spot. For the definition of the correlation length of the rough surface, refer to JA Ogilvy. , Theory of Waves scattering from random rough surfaces^ ; Petry 9/22 201237540
Beckmann 及 Andre Spizzichino 之、、The scattering ofBeckmann and Andre Spizzichino, The scattering of
Electromagnetic Waves from random rough surface^ ;及Electromagnetic Waves from random rough surface^ ; and
Joseph W. Goodman 之、、Speckle Phenomena in Optics :Joseph W. Goodman, Speckle Phenomena in Optics:
Theory and Application";若將光束截面之相位變化取代 上述定義中粗糙表面尚度變化，利用同樣之數學描】 得到光束截面之相干長度定義。該光束截面之相#干長 一參數，用以表示一光束截面上之相位變化情形。當 ^截面之相干長度越小時，表示該光束截面之相位分^ 單位戴面積内產生越多而密集的相位變化。當成像光 面之相干長度越小時，則雷射光斑之抑制效果越好。 參考圖3所示’該至少一相位干擾元件3〇可依設計 裝需要而設置在下列位置：該雷射光源丨丨與該光 肚 置13之_雷射光束投射路徑上，該光束偏折裝 射鏡面上，及該光束偏折裝置13與該屏幕2〇間 束m投射路徑上，等其中至少一位置上，如選擇 光口 14上供成像光束Π2穿透經過後再向外掃描投 幕20上以形成影像晝面；或如選擇罩設在該屏〇 上，以使影像晝面以穿透方式經過該相位干擾 7 位干擾圖案31再由人眼接故。 @^30之相 該相位干擾元件30可為一穿透式元件’即以 製成該相位干擾元件30，此時該雷射光束11〇、i ^ 之相位干擾圖案31，亚可在穿透經過之後產生至 iiu:使？雷射光束或成像光束產生建設性或破壞 =之干交化，糟以抑制在該影像晝面上所產生之雷射光 該相位干擾元件30可為一反射式元件， 料製成該相位干擾元件3〇並形成反射面，或將一 T干擾元.件30平整貼覆在〜圖3中所示戈透之相 咖^騰）.（13)之反射鏡面上而形成，m ( 10/22 201237540 束110、111或成像光束112係以反射方式經過該相位干擾元 件30之相位干擾圖案31，並可反射經過之後產生至少π之相 位差變化’即在入射及出射該相位干擾元件30之相位干擾 圖案31可分別產生至，π/2之相位差變化，俾能使該雷射光 束或成像光束產生建設性或破壞性之干涉變化，藉以抑制 在該影像晝面上所產生之雷射光斑。 請參考圖6，其係本發明該相位干擾元件3〇與一微機電 反射鏡（MEMS mirror ) ( 13 )配合設置之一實施例示意圖 。該相位干擾元件30可配合一微機電反射鏡（MEMS mirror )(13)之封裝製程，如常見之TO-can封裝方式，而設置在 該微機電反射鏡（13)，其為光束偏折裝置13之一種型態， 之透明保護蓋131之}^侧面上但不限制如圖6所示，使該雷 射光束111先穿透經遍一對應設置之相位干擾元件3〇之相 位干擾圖案31而入射至該微機電反射鏡（13)之反射鏡面 ’經由該微機電反射鏡（13)掃描形成成像光束112後又再 穿透經過另一對應設置之相位干擾元件3〇a之相位干擾圖 案31而向外投射，如此設計有利於本發明之相位干擾元件 30的設罝安裝作業及應用’即在製造或封裝該微機電反射 鏡（13)時就同時設罝安装該相位干擾元件3〇及3〇a ;又該 二對應設置之相位干擾元件30及30a可分開設置，或形成一 體但不限制而可一次貼置在該微機電反射鏡（13)之透明 保護蓋131之内側面上如圖6所示。 當該雷射光束110、111或成像光束112以反射方式或以 穿透方式經過該相位干擾元件30之相位干擾圖案31時，能 產生不均勻之空間相位變化，並使最後自屏幕2〇出射之影 像晝面之成像光之光束截面之相干長度（c〇rrelati〇n iength )縮小，藉以抑制在該影像晝面上所產生之雷射光斑；其 中該影像畫面之成像光之光束截面之相干長度係一參數， 用以表示^光束截面上之相位變化情形。當該光束截面之 相干長度越小時，表示該光束截面之相位二佈在單位截面 11/22 - 201237540 積内產生越多而密集的相位變化。當成像光束截面之相干 長度越小時’則雷射光斑之抑制效果越好。 再以圖6所示實施例為例說明但不限制，該雷射光束 111係以一定的入射角穿透經過該對應設置之相:干擾元 件30之相位干擾圖案31而入射至該微機電反射鏡（13)之 反射鏡面，經由該微機電反射鏡（13)以一掃描角度掃描 形成成像光束112後又再穿透經過另一對應設置之相 1立干^ 擾元件30 ( 30a )之相位干擾圖案31而向外投射，即成像光 ^Π2之出射角係在一預設之掃描幅度之間往復掃描，因此 該成像光束112係依時間之變化（即以不同的時間）穿透經 過該相位干擾元件3〇 (30a)之相位干擾圖案31上之不同區 域31a、31b，則以在人眼觀察的視覺暫留時間而言，雷身 光斑之對比進一步會因時間平均而再;^降低或抑制。再以 圖6所示實施例為例說明但不限制，該成像光束112係依時 間之變化（即以不同的時間）並以不同入射角，如圖6中之 0 1、（9 2，穿透經過該相位干擾元件3〇a之相位干擾圖案31 ，因此以人眼觀察的視覺暫留時間而言，雷射光斑之對比 進一步會因時間平均而再被抑制。 <第2實施例> 請參考圖7，其係本發明應用於圖2所示雷射投影系 統之一實施例示意圖。該雷射投影系統丨係用以說明本發 明之技術特徵但非用以限制本發明。該雷射投影系統1 ^ 圖2所示，包含一雷射投影器1〇及一屏幕2〇，秦中該雷 射投影斋10主要包含至少一雷射光源11供射出&射光束 110及至少一影像產生元件13，其中在該雷射光源u與該 影像產生元件13之間亦可設一合光模組12但不限制供可 將該雷射光110組成一雷射光束111。本實施例中該影像產 生元件 13 為一係下列族群：DLP(Digital Light Processor：)、 LCOS ( Liquid Crystal On Silicon )、全像（Hologram)顯像裝 12/22 201237540 置中之一種但不限制，供將雷射光束110或111形成成像 光束112，該成像光束112再由至少一出光口 μ投射至一 屏幕20上以形成影像畫面；該影像晝面再自該屏幕20出 射而由人眼接收° 本實施例之雷射光斑抑制裝置3與圖3所示實;^例大致 相同，主要不同點在於該影像產生元件13之成像方式及技 術架構不同而已；因此本實施例之雷射光斑抑制裝置3亦係 利用至少一雷射光相位干擾元件30設在該雷射光源11與該 屏幕20之間該雷射光束1丨〇、111或成像光束112之投射路徑 上，以供該雷射光束11 〇、111或成像光東112經過。至於該 相位干擾元件30及其表面所設相位干擾圖案31之滅構特徵 及作用功能則與圖3所示第1實施例相同。 參亏圖/所不，圾主少一相位干擾元件30可依設計或 組裝需要而设置在下列位置：該雷射光源丨i與該影像產生 元件13之間的雷射光束投射路徑上、該影像產生克件13 ί L,n ht Pr〇CeSS〇r^* ® ^ ic ，一亥屏幕2。之間的成像光束投射路徑上，JL中的至 如選;= 式經過該相位上’以使影像晝面以穿透方 收如罩設在出二上立:擾圖案31再由人眼接 掃描投射至屏幕2η μ仏成像光束112穿透經過後再向外Theory and Application"; If the phase change of the beam section is substituted for the change of the roughness of the rough surface in the above definition, the same mathematical description is used to obtain the definition of the coherence length of the beam section. The phase of the beam section is a parameter that is used to indicate the phase change on a beam section. When the coherence length of the cross section is small, it indicates that the phase of the beam cross section produces more and dense phase changes in the unit wearing area. When the coherence length of the imaging plane is smaller, the suppression effect of the laser spot is better. Referring to FIG. 3, the at least one phase interference component 3 can be disposed at the following position according to the design: the laser light source 丨丨 and the light beam projection path of the laser beam 13 On the mirror surface, and between the beam deflecting device 13 and the screen 2, the beam m is projected on at least one of the positions, such as the selected optical port 14 for the imaging beam 穿透2 to pass through and then scanned outward. The screen 20 is formed to form an image plane; or if a mask is selected on the screen, the image plane is penetrated through the phase to interfere with the 7-bit interference pattern 31 and is then taken by the human eye. The phase interference component 30 of the @^30 phase may be a transmissive component 'that is to form the phase interference component 30. At this time, the phase interference pattern 31 of the laser beam 11 〇, i ^ is penetrated. After that, it is generated to iiu: make? The laser beam or the imaging beam produces constructive or disruptive = dry interference, which is used to suppress the laser light generated on the image plane. The phase interference component 30 can be a reflective component, and the phase interference component is made. 3〇 and form a reflecting surface, or a T interference element. The piece 30 is flatly pasted on the mirror surface of the Gou's phase coffee (Teng) shown in Fig. 3, m (10/22) 201237540 The beam 110, 111 or imaging beam 112 passes through the phase interference pattern 31 of the phase interference element 30 in a reflective manner, and can generate a phase difference change of at least π after reflection, that is, the phase of the phase interference element 30 incident and exiting. The interference pattern 31 can be respectively generated to a phase difference of π/2, which can cause a constructive or destructive interference change of the laser beam or the imaging beam, thereby suppressing the laser spot generated on the image plane. Please refer to FIG. 6 , which is a schematic diagram of an embodiment of the phase interference component 3 〇 and a MEMS mirror ( 13 ) of the present invention. The phase interference component 30 can be coupled with a microelectromechanical mirror ( MEMS mirr Or (13) a packaging process, such as a common TO-can package, but disposed in the microelectromechanical mirror (13), which is a type of beam deflecting device 13, the transparent protective cover 131} On the side, but not limited to FIG. 6, the laser beam 111 is first incident on the mirror surface of the microelectromechanical mirror (13) through the phase interference pattern 31 of the phase interference element 3〇 disposed correspondingly. 'Scanning through the microelectromechanical mirror (13) to form the imaging beam 112 and then penetrating through the phase interference pattern 31 of the other correspondingly disposed phase interference element 3A, projecting outwardly, thus being designed to facilitate the phase of the present invention The mounting operation and application of the interference component 30 is to install the phase interference component 3〇 and 3〇a at the same time when manufacturing or packaging the microelectromechanical mirror (13); and the phase interference component of the corresponding arrangement 30 and 30a may be separately provided, or integrated, but not limited, and may be placed once on the inner side of the transparent protective cover 131 of the microelectromechanical mirror (13) as shown in Fig. 6. When the laser beam 110, 111 Or imaging beam 112 in a reflective manner or When the transmission mode passes through the phase interference pattern 31 of the phase interference component 30, a non-uniform spatial phase change can be generated, and the coherence length of the beam cross section of the imaging light that is finally emitted from the screen 2〇 (c〇rrelati〇) n iength ) is reduced to suppress the laser spot generated on the image plane; wherein the coherence length of the beam cross section of the image light of the image frame is a parameter for indicating the phase change of the beam cross section. The smaller the coherence length of the beam cross section, the more phase changes the phase 2 of the beam section produces in the product section 11/22 - 201237540. When the coherence length of the section of the imaging beam is small, the suppression effect of the laser spot is better. The embodiment shown in FIG. 6 is exemplified and not limited. The laser beam 111 penetrates through the corresponding phase of the phase: the phase interference pattern 31 of the interference component 30 and enters the microelectromechanical reflection at a certain angle of incidence. The mirror surface of the mirror (13) is scanned by the microelectromechanical mirror (13) at a scanning angle to form an imaging beam 112 and then penetrates through the phase of another correspondingly disposed phase interference element 30 (30a) The interference pattern 31 is projected outward, that is, the exit angle of the imaging light is reciprocally scanned between a predetermined scanning amplitude, so that the imaging beam 112 passes through the time (ie, at different times). The phase interference component 3 〇 (30a) of the phase interference pattern 31 different regions 31a, 31b, in terms of the visual persistence time observed by the human eye, the contrast of the lightning body spot is further reduced by time averaging; Or inhibit. The embodiment shown in FIG. 6 is taken as an example for illustration and not limitation. The imaging beam 112 changes with time (ie, at different times) and at different incident angles, as shown in FIG. 6 (1, (2, 2). Since the phase interference pattern 31 of the phase interference element 3a is passed through, the contrast of the laser spot is further suppressed by the time average in terms of the visual retention time observed by the human eye. <2nd embodiment> Please refer to FIG. 7, which is a schematic diagram of an embodiment of the present invention applied to the laser projection system shown in FIG. 2. The laser projection system is used to illustrate the technical features of the present invention, but is not intended to limit the present invention. The laser projection system 1 ^ shown in FIG. 2 includes a laser projector 1 〇 and a screen 2 〇. The laser projection 10 includes at least one laser light source 11 for emitting &lifying the beam 110 and at least An image generating component 13 , wherein a light combining module 12 is disposed between the laser light source u and the image generating component 13 , but the laser light 110 is not limited to form a laser beam 111 . The image generating component 13 is a group of the following groups: DLP (Digit) Al Light Processor:), LCOS (Liquid Crystal On Silicon), Hologram imaging device 12/22 201237540 One of the ones, but not limited to, for forming laser beam 110 or 111 into imaging beam 112, the imaging beam 112 is further projected onto a screen 20 by at least one light exit port μ to form an image frame; the image surface is then emitted from the screen 20 and received by the human eye. The laser spot suppression device 3 of the embodiment is shown in FIG. The example is substantially the same, and the main difference is that the imaging mode and the technical architecture of the image generating component 13 are different; therefore, the laser spot suppression device 3 of the embodiment is also provided with at least one laser light phase interference component 30. A projection path of the laser beam 11 111, 111 or the imaging beam 112 between the laser source 11 and the screen 20 for the laser beam 11 111, 111 or imaging light 112 to pass. As for the phase interference element The extinction characteristics and function functions of the phase interference pattern 31 provided on the surface 30 and the surface thereof are the same as those in the first embodiment shown in Fig. 3. In addition, the phase interference element 30 can be designed or assembled according to the design. and Positioned in the following position: the laser beam projection path between the laser source 丨i and the image generating element 13 is generated by the image 13 ί L,n ht Pr〇CeSS〇r^* ® ^ ic , On the imaging beam projection path between the two screens, the JL is as follows; = the pattern is passed through the phase to make the image surface pass through the cover, such as the cover is set on the upper two: the disturbance pattern 31 Projected by the human eye to the screen 2n μ仏 imaging beam 112 passes through and then outward
上以形成影像晝面。 I 穿透11或成像光束112以反射方式或以 產生不均勻ϊίΓΐ元件30之相位干擾圖案31時，能 像畫面之成像光的』’並使取後自屏幕2g出射之影 以抑制在該影像c〇rreiati〇niength)'输小’藉 度係一用以界定=八挽生之雷射光斑；其中該相干長 情形的參數::；夏中二狀態之變化頻率 以中該衫像晝面之成像光之光束截面之相 13/22 201237540 度係 > 數，用以表示一光束截面上之相位變化情形。 之相干長度越小時’表示該光束截面之相位 刀佈在早位截面積内產生越多而密集的相位變化。當成像 光束截面之相干長度越小時，則雷射光斑之抑制效果越好 k再舉例§兒明本發明之作用及功效：該相位干擾圖案 用一長度週期PX及Py來表示，其高度變化h範圍 =於四分之一波長λ(該雷射光束或成像光束之波長為χ ^且PXA，Py小於該雷射光束11〇、1U或成像光束112之 直徑’俾能使波長為λ之雷射光之相位產生建設性或破壞性 干涉之變化，如·. ^ 雷射光波長λ= 532nm，h(min)=l/4X(133nm); 則取雷射光光散射後之第1階（1st order)計算之； 依據模擬（Simulation)試驗，確實可驗證此一本發明 可有效降低雷射光斑。 參閱圖8所示，其係尚未利用本發明之雷射光斑抑制裝 ^之前，雷射光斑對比度與屏幕表面的粗糙度其相干長度（ 定義為Is)關係圖，由圖8可知雷射光斑對比度隨著屏幕表 面的粗糙度之相干長度逐漸增加（雷射光斑對比度為 60-100);再參閱圖9所示，以週期性圖案為例，且當ρχ = py - 1波長’其係已利用本發明之雷射光斑抑制裝置之後， 雷射光斑對比度與屏幕表面的粗糙度其相干長度（定義為Is )比較圖，由圖9可知，加入一二維相位干擾元件30後，雷 射光斑的對比度明顯的降低，雷射光斑對比度低於75以下 ’顯見本發明之雷射光斑抑制裝置及其抑制方法確實可達 成抑制雷射光斑的具體功效。 本發明之雷射投影系統之雷射光斑抑制方法，其中該 雷射投影系統1包含一雷射投影器丨〇及一屏幕2 〇，其中該雷 射投影器10主要包含至少一雷射先源丨丨供射出雷射光束 110及至少一影像產生元件13，其中在該雷射光源u與該影 14/22 201237540 像產生元件13之間亦可設一合光模組12但不限制挺可將該 雷射光束110組成一雷射光束111 ;該影像產生元件13可將 雷射光束110或ιη形成成像光束112以由該雷射投影器1〇 之至少一出光u 14投射至該屏幕20上以形成影像晝面供人 眼觀看’雷射先斑抑制方法包含下列步驟： 提供至少一雷射光之相位干擾元件30，其上設有至少 一雷射光之相位干擾圖案31，其中該相位干擾圖案31係 用以使雷射光束U〇、111或成像光束112以反射方式或穿 透方式經過該相位干擾圖案31時能產生不均勻'乏相位變 化； 將5亥至少一相位干擾元件30設置於該雷射光源11與 該屏f 20之間的投射.路徑上，以使雷射光束110:、111或 士，，束112在投射至該屏幕20之前能以反射或穿透方式 无！^該至少—相位干擾元件3〇之相位干擾圖案31 ;及 的相仇干擾圖案31，對經過該相位干擾圖案31 化田並使最接111或成像光束112產生不均勻之相位變 縮小，，以屏* 2〇出射之影像畫面成像光的相干長度 其制在該影像晝面上產生雷射光斑； 狀態之變化』：J J : Π J -分佈（distribution ) 像光之光束戴面i相：長ί俜二i;中該影ί晝面之之成 光束戴面之相位分佈在=相干；度越小時’ 射光斑之抑制效=二束截面之相干長度越小時’則雷 多以發明專的t心 ’修改，甚至等效變更，乾圍内可對其進行許 仁都將落入本發明的保護 “微月專利要求所限定的籍具通吊日識者理解 範圍内 15/22 201237540 【圖式簡單說明】 圖1係習知雷射投影系統（設有光束偏折 示意圖。 i ~~實施例 圖2係習知另一種雷射投影系統 一實施例示意圖。 (非設有光束偏折裝置) 圖3係本發明所應用於圖1所示雷射投影系統之 (第1實施例）示意圖。 —實施例Upper to form an image plane. When the penetration 11 or the imaging beam 112 is reflected or generated to produce a non-uniform phase interference pattern 31 of the element 30, it can be like the image of the picture and is taken out from the screen 2g to suppress the image. C〇rreiati〇niength) 'transfer small' borrowing degree is used to define = eight-shot laser spot; the parameter of the coherent long case::; the frequency of the change of the state of the summer is in the face of the shirt The phase of the beam section of the imaging light is 13/22 201237540 degrees > to indicate the phase change on a beam section. The smaller the coherence length is, the more the phase of the beam cross-section is, and the more the phase change occurs in the early cross-sectional area. When the coherence length of the cross section of the imaging beam is small, the suppression effect of the laser spot is better. k. The function and effect of the present invention are as follows: the phase interference pattern is represented by a length period PX and Py, and the height variation is h. Range = at a quarter wavelength λ (the wavelength of the laser beam or imaging beam is χ ^ and PXA, Py is smaller than the diameter of the laser beam 11 〇, 1 U or imaging beam 112 俾 can make the wavelength λ thunder The phase of the illuminating light produces a change in constructive or destructive interference, such as .. ^ laser light wavelength λ = 532 nm, h (min) = l / 4X (133 nm); then the first order after laser light scattering (1st order According to the simulation test, it can be verified that the invention can effectively reduce the laser spot. Referring to FIG. 8, it is not before using the laser spot suppression device of the present invention, the laser spot contrast The relationship between the coherence length (defined as Is) and the roughness of the surface of the screen. It can be seen from Fig. 8 that the contrast of the laser spot gradually increases with the coherence length of the surface roughness of the screen (the contrast of the laser spot is 60-100); Figure 9 shows the periodic diagram For example, and when ρ χ = py - 1 wavelength ', after using the laser spot suppression device of the present invention, the contrast between the laser spot contrast and the surface roughness of the screen (defined as Is) is compared. 9 It can be seen that after adding a two-dimensional phase interference element 30, the contrast of the laser spot is obviously reduced, and the contrast of the laser spot is lower than 75. It is obvious that the laser spot suppression device of the present invention and the suppression method thereof can achieve the suppression of the laser. The specific effect of the light spot. The laser spot suppression system of the laser projection system of the present invention, wherein the laser projection system 1 comprises a laser projector and a screen 2 〇, wherein the laser projector 10 mainly comprises at least A laser source is provided for emitting the laser beam 110 and the at least one image generating component 13, wherein a light combining module 12 may be disposed between the laser light source u and the image 14/22 201237540 image generating component 13. However, it is not limited to form the laser beam 110 into a laser beam 111; the image generating element 13 can form the laser beam 110 or ι to form an imaging beam 112 to emit at least one light u 14 from the laser projector 1 Shooting onto the screen 20 to form an image pupil for viewing by the human eye. The laser first spot suppression method comprises the following steps: providing at least one phase light interference element 30 of laser light, on which at least one phase interference pattern 31 of laser light is disposed. Wherein the phase interference pattern 31 is used to cause the non-uniform 'dead phase change" when the laser beam U〇, 111 or the imaging beam 112 passes through the phase interference pattern 31 in a reflective manner or in a penetrating manner; The phase interference component 30 is disposed on a projection path between the laser source 11 and the screen f 20 such that the laser beam 110:, 111 or ±, the beam 112 can be reflected or reflected before being projected onto the screen 20. No penetration method! The at least phase interference pattern 31 of the phase interference component 3; and the vengeance interference pattern 31 are reduced in the phase through the phase interference pattern 31 and the phase of the maximum connection 111 or the imaging beam 112 is reduced. Screen * 2〇 The image of the coherent length of the imaged light produces a laser spot on the image surface; the change of state: JJ : Π J - distribution (distribution) beam of light beam i phase: long俜 俜 二 i; in the shadow 昼 之 成 光束 光束 光束 光束 光束 光束 光束 光束 光束 光束 光束 光束 光束 光束 光束 光束 光束 光束 光束 光束 光束 光束 光束 光束 光束 相位 相位 相位 相位 相位 相位 相位 相位 相位 相位 相位 相位 相位 相位 相位 相位 相位 相位 相位 相位 相位 相位t heart 'modification, even equivalent change, Xu Ren will be included in the protection of the invention within the scope of the invention. "The micro-month patent requirements are limited to the scope of the understanding of the day. 15/22 201237540 BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a conventional laser projection system (provided with a beam deflection diagram. i ~ ~ embodiment FIG. 2 is a schematic diagram of another embodiment of a conventional laser projection system. Figure 3 is the application of the present invention to Figure 1 Example - Laser projection systems (first embodiment) FIG.
圖4係本發明之相位干擾元件之相位干擾圖案（一維散亂 圖案’ random pattern) —實施例示意圖（放大圖）。 圖5係本發明之相位干擾元件之相位千擾圖案（一維週期 性圖案’ .periodic pattern)另一實施例示意圖（放大圖）。 圖;6係本發朗之相冰^干擾元件與一微機電反射鏡（MEMS mirror )配合設置之一實施例示意圖。 圖7係本發明所應用於圖2所示雷射投影系統之一實施例 (第2實施例）示意圖。 圖8係雷射投影系統尚未利用本發明之前之抑制前光斑對 比度與相干長度示意圖。 圖9係雷射投影系統已利用本發明之後之光斑對比度與相 干長度不意圖。 【主要元件符號說明】 雷射投影系統1 雷射投影器10 雷射光源11 雷射光束110、111 成像光束112 合光模組12 影像產生元件13 透明保護蓋131 出光口 14 16/22 201237540 屏幕20 相位干擾元件3 0、3 0 a 相位干擾圖案31、31a、31b 17/22Fig. 4 is a phase interference pattern of a phase interference element of the present invention (a random pattern) - a schematic view (enlarged view) of an embodiment. Fig. 5 is a schematic view (enlarged view) showing another embodiment of a phase interference pattern (one-dimensional periodic pattern) of a phase interference element of the present invention. Fig. 6 is a schematic view showing an embodiment of the arrangement of the phase interference element and a microelectromechanical mirror (MEMS mirror). Figure 7 is a schematic view showing an embodiment (second embodiment) of the laser projection system of Figure 2 applied to the present invention. Figure 8 is a schematic illustration of pre-suppression spot contrast and coherence length prior to the use of the present invention in a laser projection system. Figure 9 is a schematic illustration of the spot contrast and coherence lengths after the laser projection system has utilized the present invention. [Main component symbol description] Laser projection system 1 Laser projector 10 Laser light source 11 Laser beam 110, 111 Imaging beam 112 Light combining module 12 Image generating element 13 Transparent protective cover 131 Light exit port 14 16/22 201237540 Screen 20 phase interference element 3 0, 3 0 a phase interference pattern 31, 31a, 31b 17/22