TWI421619B - Projection system and its detection method - Google Patents
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本發明涉及一種投影系統，尤其涉及一種可提高使用安全性的投影系統及其偵測方法。 The invention relates to a projection system, in particular to a projection system capable of improving safety of use and a detection method thereof.
一種習知可應用在手機、個人數據助理、可攜式放映機等電子產品中的投影系統包括一投影成像光源、一光源驅動電路、一掃描單元、一掃描單元驅動電路及一控制器。所述掃描單元具有一可來回往復擺動的微機電鏡片。當手機、個人數據助理、可攜式投影機等處於開啟或自檢狀態時，所述投影系統之控制器控制掃描單元驅動電路及光源驅動電路；所述掃描單元驅動電路用以驅動微機電鏡片擺動；用於控制輸出相對應的影像訊號的光源驅動電路會同時驅動投影成光源生成並輸出具高功率的投影用雷射光。由投影成像光源輸出的投影用雷射光通過微機電鏡片的擺動而以掃描方式射出並投影於投影面上。 A projection system that can be applied to electronic products such as mobile phones, personal data assistants, portable projectors, and the like includes a projection imaging light source, a light source driving circuit, a scanning unit, a scanning unit driving circuit, and a controller. The scanning unit has a microelectromechanical lens that can swing back and forth. When the mobile phone, the personal data assistant, the portable projector, etc. are in an open or self-test state, the controller of the projection system controls the scan unit driving circuit and the light source driving circuit; the scanning unit driving circuit is used to drive the micro-electromechanical lens The light source driving circuit for controlling the corresponding image signal of the output simultaneously drives the projection into a light source to generate and output the projection laser light with high power. The projection laser light output by the projection imaging light source is scanned and projected onto the projection surface by the oscillation of the microelectromechanical lens.
惟，習知的投影系統使用過程中，當微機電鏡片無法正常擺動時，投影用雷射光將無法藉由微機電鏡片的正常擺動而正常投影，尤其當微機電鏡片無法擺動時，由微機電鏡片送出的投影用雷射光將彙聚成束狀，而該輸出的高功率投影用雷射光長時間的照射在易燃物或人體上容易造成火災或灼傷事故的發生，故針對該種 習知的投影系統的缺陷有必要研發一種可偵測微機電鏡片運行狀況進而確保使用安全的投影系統。 However, in the process of using the conventional projection system, when the microelectromechanical lens cannot swing normally, the projection laser light cannot be normally projected by the normal oscillation of the microelectromechanical lens, especially when the microelectromechanical lens cannot swing, by the microelectromechanical device. The projection laser light emitted by the lens will be concentrated into a bundle, and the high-power projection of the output is irradiated with laser light for a long time on the flammable material or the human body, which may cause a fire or burn accident, so Defects of conventional projection systems necessitate the development of a projection system that can detect the operation of a microelectromechanical lens to ensure safe use.
本發明的目的之一是針對上述習知技術存在之缺陷提供一種可提高使用安全性的投影系統。 One of the objects of the present invention is to provide a projection system that can improve the safety of use in view of the above-described drawbacks of the prior art.
為達成上述目的，本發明所提供的投影系統包括一投影成像光源、一偵測光源、一光源驅動電路、一掃描單元、一掃描單元驅動電路、至少一感知器及一控制器；光源驅動電路用以驅動投影成像光源及偵測光源；掃描單元具有一可擺動的微機電鏡片，用以接受投影成像光源及偵測光源的光且送出後分別形成有一投影成像區域及一偵測區域；掃描單元驅動電路用以驅動微機電鏡片的擺動；感知器設置於偵測區域內用以接受掃描單元送出的光並根據光的輸入狀況生成反饋訊號；控制器用以控制光源驅動電路及掃描單元驅動電路且據接受之反饋訊號輸出偵測結果。 In order to achieve the above object, a projection system provided by the present invention includes a projection imaging light source, a detection light source, a light source driving circuit, a scanning unit, a scanning unit driving circuit, at least one sensor and a controller; and a light source driving circuit The scanning unit has a oscillating micro electromechanical lens for receiving the projection imaging light source and detecting the light of the light source and sending a projection imaging area and a detection area respectively; The unit driving circuit is configured to drive the oscillation of the MEMS lens; the sensor is disposed in the detecting area for receiving the light sent by the scanning unit and generating a feedback signal according to the input condition of the light; the controller is configured to control the light source driving circuit and the scanning unit driving circuit The detection result is output according to the received feedback signal.
如上所述，本發明之投影系統可將偵測光源送出的偵測光藉由微機電鏡片的擺動而以掃描方式送出並由感知器接受，故控制器可由感知器送出的反饋訊號判斷微機電鏡片的運行狀況並輸出偵測結果，從而可避免因微機電鏡片不動時引起高功率的雷射光長時間照射易燃物或人體上而引起的火災事故或灼傷，進而提高使用安全性。 As described above, the projection system of the present invention can detect and transmit the detection light sent by the detection source by the oscillating movement of the MEMS lens and receive it by the sensor, so that the controller can determine the MEMS by the feedback signal sent by the sensor. The operation state of the lens and the detection result are output, thereby avoiding fire accidents or burns caused by high-power laser light caused by the high-power laser light for a long time when the MEMS lens is not moved, thereby improving the safety of use.
本發明的目的之二是針對上述習知技術存在之缺陷提供一種可提高投影系統使用安全性的偵測方法。 A second object of the present invention is to provide a detection method that can improve the security of use of a projection system in view of the above-mentioned drawbacks of the prior art.
為達成上述目的，本發明所提供的投影系統的偵測方法包括如下步驟：(1)由控制器控制光源驅動電路並使所述光源驅動電路驅動偵測光源生成偵測光；(2)由偵測光源生成的偵測光藉由掃描單元的微機電鏡片以掃描方式送出；(3)由微機電鏡片送出的偵測光由感知器接受並生成相應的反饋訊號給控制器；及(4)控制器接受反饋訊號並判斷微機電鏡片是否掃描異常而後控制輸出相應偵測結果。 In order to achieve the above object, the method for detecting a projection system provided by the present invention includes the following steps: (1) controlling a light source driving circuit by a controller and causing the light source driving circuit to drive a detecting light source to generate detection light; (2) The detecting light generated by the detecting light source is sent by scanning by the microelectromechanical lens of the scanning unit; (3) the detecting light sent by the microelectromechanical lens is received by the sensor and generating a corresponding feedback signal to the controller; and (4) The controller receives the feedback signal and determines whether the microelectromechanical lens scans abnormally and then controls the output of the corresponding detection result.
本發明之偵測方法可將偵測光源送出的偵測光藉由微機電鏡片的擺動而以掃描方式送出並由感知器接受，故控制器可由感知器送出的反饋訊號判斷微機電鏡片的運行狀況並輸出偵測結果，從而可避免因微機電鏡片不動時引起高功率的雷射光長時間照射易燃物或人體上而引起的火災事故或灼傷，進而提高使用安全性。 The detecting method of the present invention can detect the light emitted by the detecting light source by scanning the MEMS lens and send it by the sensor, so that the controller can judge the operation of the MEMS lens by the feedback signal sent by the sensor. The condition is output and the detection result is output, thereby avoiding fire accidents or burns caused by high-power laser light caused by the high-power laser light for a long time when the MEMS lens is not moved, thereby improving the safety of use.
100‧‧‧投影系統 100‧‧‧Projection system
10‧‧‧投影成像光源 10‧‧‧Projection imaging light source
101‧‧‧投影成像區域 101‧‧‧Projection imaging area
20‧‧‧光源驅動電路 20‧‧‧Light source drive circuit
30‧‧‧掃描單元 30‧‧‧ scan unit
301‧‧‧微機電鏡片 301‧‧‧Microelectromechanical lenses
40‧‧‧掃描單元驅動電路 40‧‧‧Scan unit drive circuit
50‧‧‧偵測光源 50‧‧‧Detecting light source
501‧‧‧偵測區域 501‧‧‧Detection area
60‧‧‧感知器 60‧‧‧ Sensor
70‧‧‧控制器 70‧‧‧ Controller
第一圖為本發明之投影系統之結構原理圖。 The first figure is a structural schematic diagram of the projection system of the present invention.
第二圖為本發明之投影系統的投影成像光源及偵測光源的投影示意圖。 The second figure is a projection view of the projection imaging light source and the detection light source of the projection system of the present invention.
第三圖為本發明之投影系統所使用的偵測方法的流程示意圖。 The third figure is a schematic flow chart of the detection method used by the projection system of the present invention.
為詳細說明本發明之技術內容、構造特徵、所達成目的及功效， 以下茲舉例並配合圖式詳予說明。 In order to explain in detail the technical content, structural features, achieved goals and effects of the present invention, The following is an example and is explained in detail with the drawings.
請參閱第一圖及第二圖，本發明之投影系統100包括一投影成像光源10、一光源驅動電路20、一掃描單元30、一掃描單元驅動電路40、偵測光源50、至少一感知器60及一控制器70。 Referring to the first and second figures, the projection system 100 of the present invention includes a projection imaging light source 10, a light source driving circuit 20, a scanning unit 30, a scanning unit driving circuit 40, a detecting light source 50, and at least one sensor. 60 and a controller 70.
請參閱第一圖及第二圖，本發明之投影系統100的控制器70用以控制光源驅動電路20及掃描單元驅動電路40。所述光源驅動電路20用以驅動投影成像光源10及偵測光源50分別生成投影用雷射光及偵測光。所述掃描單元驅動電路40用以驅動掃描單元30。掃描單元30具有一可往復擺動的微機電鏡片301，用以接受投影成像光源10及偵測光源50的光且送出後於投影處分別形成有一投影成像區域101及一偵測區域501。感知器60設置於偵測區域501內，用以接受掃描單元30送出的偵測光並根據偵測光的輸入狀況生成反饋訊號。 Referring to the first and second figures, the controller 70 of the projection system 100 of the present invention controls the light source driving circuit 20 and the scanning unit driving circuit 40. The light source driving circuit 20 is configured to drive the projection imaging light source 10 and the detecting light source 50 to generate projection laser light and detection light, respectively. The scanning unit driving circuit 40 is used to drive the scanning unit 30. The scanning unit 30 has a reciprocatingly oscillating microelectromechanical lens 301 for receiving the light of the projection imaging source 10 and the detection source 50 and sending a projection imaging area 101 and a detection area 501 respectively at the projection. The sensor 60 is disposed in the detection area 501 for receiving the detection light sent by the scanning unit 30 and generating a feedback signal according to the input condition of the detection light.
請續參閱第一圖及第二圖，本發明之投影系統100的微機電鏡片301可繞兩相互垂直的空間軸向上同時來回往復擺動，為方便描述，特規定微機電鏡片301在掃描單元驅動電路40的驅動下可同時繞空間坐標系的X軸和Y軸來回往復擺動，當微機電鏡片301繞X軸轉動時，由投影成像光源10入射之雷射光經微機電鏡片301的反射可在一個維度上進行圖像掃描；同理，當微機電鏡片301繞Y軸轉動時可在另一個維度上進行圖像掃描。藉此可將二維影像投影於相應的投影面上。 Referring to the first and second figures, the microelectromechanical lens 301 of the projection system 100 of the present invention can be reciprocally oscillated back and forth in two axial directions perpendicular to each other. For convenience of description, the microelectromechanical lens 301 is specifically driven by the scanning unit. The circuit 40 can be driven to reciprocate back and forth around the X-axis and the Y-axis of the space coordinate system. When the micro-electromechanical lens 301 is rotated about the X-axis, the reflection of the laser light incident by the projection imaging source 10 through the micro-electromechanical lens 301 can be Image scanning is performed in one dimension; similarly, image scanning can be performed in another dimension when the microelectromechanical lens 301 is rotated about the Y axis. Thereby, the two-dimensional image can be projected on the corresponding projection surface.
請參閱第二圖，投影成像光源10及偵測光源50送出的投影用雷射 光和偵測光以不同的角度投射於微機電鏡片301上，由投影成像光源10及偵測光源50送出的投影用雷射光和偵測光經微機電鏡片301的反射投影後分別投影處形成一投影成像區域101及一偵測區域501。所述投影成像區域101及偵測區域501無交疊部分。所述偵測區域501進一步由兩條相互垂直的分界線劃分為四個子區域，即在本具體實施例中所述分界線與微機電鏡片301僅繞X軸或Y軸來回往復擺動時送出的偵測光形成的掃描路徑相對應，該偵測區域501的子區域內放置有感知器60。 Please refer to the second figure, the projection imaging light source 10 and the projection laser sent by the detection light source 50 The light and the detection light are projected on the microelectromechanical lens 301 at different angles, and the projection laser light and the detection light sent by the projection imaging light source 10 and the detection light source 50 are respectively projected by the reflection of the microelectromechanical lens 301 and then projected. A projection imaging area 101 and a detection area 501. The projected imaging area 101 and the detection area 501 have no overlapping portions. The detecting area 501 is further divided into four sub-areas by two mutually perpendicular dividing lines, that is, when the dividing line and the micro-electromechanical lens 301 are reciprocating back and forth around the X-axis or the Y-axis in the embodiment, Corresponding to the scanning path formed by the detection light, a sensor 60 is placed in the sub-area of the detection area 501.
當投影系統100處於開啟或自檢狀態時，控制器70分別向掃描單元驅動電路40及光源驅動電路20發出相應的驅動訊號。所述掃描單元驅動電路40驅動掃描單元30之微機電鏡片301來回往復擺動。所述控制器70同時將相應的同步驅動訊號傳送給光源驅動電路20，並使光源驅動電路20分別驅動投影成像光源10及偵測光源50生成相應的投影用雷射光及偵測光，所述投影成像光源10生成的投影用雷射光和偵測光源50生成的偵測光以不同角度投射於來回往復擺動的微機電鏡片301上，藉由微機電鏡片301的來回往復擺動，故可使投影用雷射光和偵測光均以掃描方式送出。 When the projection system 100 is in the on state or the self-test state, the controller 70 sends corresponding driving signals to the scanning unit driving circuit 40 and the light source driving circuit 20, respectively. The scanning unit driving circuit 40 drives the microelectromechanical lens 301 of the scanning unit 30 to swing back and forth. The controller 70 simultaneously transmits the corresponding synchronous driving signal to the light source driving circuit 20, and causes the light source driving circuit 20 to respectively drive the projection imaging light source 10 and the detecting light source 50 to generate corresponding projection laser light and detection light. The projection laser light generated by the projection imaging light source 10 and the detection light generated by the detection light source 50 are projected at different angles on the micro electromechanical lens 301 that reciprocates back and forth, and the microelectromechanical lens 301 is reciprocally oscillated back and forth. Both the laser light and the detection light are sent in a scanning manner.
本發明之投影系統100中，微機電鏡片301不正常擺動時，存在三種情況。第一種情況：即當微機電鏡片301無法擺動而停留於偵測區域某一位置時，經掃描單元30之微機電鏡片301掃描後送出之投影用雷射光和偵測光將無法以掃描方式送出，且偵測光將匯集成束狀照射於偵測區域501的對應位置上，此時，由微機電鏡片301送出的偵測光存在兩種情況：即其中一感知器60可接收到 偵測光或位於偵測區域501內的感知器60均無法接收到偵測光，該兩種情況均可由感知器60判斷並輸出相應反饋訊號，該反饋訊號由控制器70接受並輸出微機電鏡片301運行不正常的訊號給顯示單元(圖中未示)，藉此可使本投影系統100及操作人員知悉投影設備處於不正常運行的狀況並作下一步相關的操作。 In the projection system 100 of the present invention, when the microelectromechanical lens 301 is not normally oscillated, there are three cases. In the first case, when the microelectromechanical lens 301 cannot swing and stay at a certain position in the detection area, the projection laser light and the detection light sent out by the microelectromechanical lens 301 of the scanning unit 30 cannot be scanned. The detection light is collected in a bundle shape and irradiated on the corresponding position of the detection area 501. At this time, the detection light sent by the micro electromechanical lens 301 has two cases: one of the sensors 60 can receive The detection light or the sensor 60 located in the detection area 501 can not receive the detection light. In both cases, the sensor 60 can determine and output a corresponding feedback signal, and the feedback signal is accepted by the controller 70 and outputs the micro-electromechanical device. The lens 301 runs an abnormal signal to the display unit (not shown), thereby enabling the projection system 100 and the operator to know that the projection device is in an abnormal operation and perform the next related operation.
第二種情況：即當微機電鏡片301在X軸和Y軸中的任一個軸向上無法擺動或在X軸和Y軸任一個軸向上可擺動但擺動不到位亦或者在其中一個軸向上可擺動而在另一個軸向上擺動到一定角度停止不動時，經微機電鏡片301掃描後送出的偵測光沿偵測區域501的相應位置來回往復掃描。當微機電鏡片301在X軸和Y軸中的任一個軸向上無法擺動或在X軸和Y軸任一個軸向上可擺動但擺動不到位時，此時，感知器60均無法接受由微機電鏡片送出的偵測光，感知器60生成的微機電鏡片301掃描異常的反饋訊號並由控制器70接受判斷，所述控制器70控制輸出微機電鏡片301掃描異常的訊號個顯示單元(圖中未示)，藉此可使本投影系統100及操作人員知悉投影裝置處於不正常運行的狀況並作下一步相關的操作。當微機電鏡片在其中一個軸向上可擺動而在另一個軸向上擺動到一定角度停止不動時，此時，微機電鏡片301送出的偵測光可由部分感知器60接受，也可掃描於偵測區域的空白處，感知器60根據上述兩種情況同樣生成微機電鏡片掃描異常的反饋訊號並由控制器接受判斷，所述控制器70控制輸出微機電鏡片301掃描異常的訊號個顯示單元(圖中未示)，藉此可使本投影系統100及操作人員知悉投影裝置處於不正常運行的狀況並作下一步相關的操作 。 The second case is that when the microelectromechanical lens 301 is not oscillating in either of the X-axis and the Y-axis, or is swingable in either of the X-axis and the Y-axis, the swing is not in place or in one of the axial directions. When the swinging is performed in another axial direction and is stopped at a certain angle, the detected light sent by the microelectromechanical lens 301 is scanned back and forth along the corresponding position of the detecting area 501. When the microelectromechanical lens 301 is unable to swing in either of the X-axis and the Y-axis, or is swingable in either of the X-axis and the Y-axis, but the swing is not in place, at this time, the sensor 60 is unacceptable by the micro-electromechanical device. The detection light sent by the lens, the micro electromechanical lens 301 generated by the sensor 60 scans the abnormal feedback signal and is judged by the controller 70, and the controller 70 controls the output micro electromechanical lens 301 to scan the abnormal signal display unit (in the figure) Not shown), whereby the projection system 100 and the operator can know that the projection device is in an abnormal operation state and perform the next related operation. When the microelectromechanical lens is swingable in one of the axial directions and is swung in the other axial direction to a certain angle and stops, at this time, the detection light sent by the microelectromechanical lens 301 can be received by the partial sensor 60, and can also be scanned for detection. In the blank space of the area, the sensor 60 generates a feedback signal of the microelectromechanical lens scanning abnormality according to the above two conditions and is judged by the controller, and the controller 70 controls the output micro electromechanical lens 301 to scan the abnormal signal display unit (Fig. Therefore, the projection system 100 and the operator can know that the projection device is in an abnormal operation state and perform the next related operation. .
第三種情況：即當微機電鏡片301在X軸和Y軸的軸向上均可擺動，但有至少有一個軸向上擺動不到位時，此時，感知器60雖能接受到微機電鏡片301送出的偵測光，但感知器60接受到的偵測光的時間間隔、頻率等均較微機電鏡片301正常擺動時的時間間隔、頻率等有差異。據此感知器60生成的微機機電鏡片301掃描異常的反饋訊號並由控制器70接受判斷，所述控制器70控制輸出微機電鏡片301掃描異常的訊號給顯示單元(圖中未示)，藉此可使本投影系統100及操作人員知悉投影設備處於不正常運行的狀況並作下一步相關的操作。 In the third case, when the microelectromechanical lens 301 can swing in the axial direction of the X-axis and the Y-axis, but at least one of the axial oscillations is not in place, the sensor 60 can receive the micro-electromechanical lens 301 at this time. The detected light is sent out, but the time interval, frequency, and the like of the detected light received by the sensor 60 are different from the time interval, frequency, and the like when the micro-electromechanical lens 301 is normally swung. The microcomputer electromechanical lens 301 generated by the sensor 60 scans the abnormal feedback signal and is judged by the controller 70. The controller 70 controls the output micro electromechanical lens 301 to scan the abnormal signal to the display unit (not shown). This allows the projection system 100 and the operator to know that the projection device is in an abnormal operating state and perform the next related operation.
如上所述，本發明之投影系統100可將偵測光源50送出的偵測光藉由微機電鏡片301的擺動而以掃描方式送出並由感知器60接受，故控制器70可由感知器60送出的反饋訊號判斷微機電鏡片301的運行狀況並輸出偵測結果，從而可避免因微機電鏡片301不動時引起高功率的雷射光長時間照射易燃物或人體上而引起的火災事故或灼傷，進而提高使用安全性。 As described above, the projection system 100 of the present invention can send the detection light sent from the detection light source 50 in a scanning manner by the oscillation of the microelectromechanical lens 301 and be accepted by the sensor 60, so that the controller 70 can be sent by the sensor 60. The feedback signal determines the operating condition of the microelectromechanical lens 301 and outputs the detection result, thereby avoiding a fire accident or burn caused by the high power laser light being irradiated to the inflammable material or the human body for a long time when the microelectromechanical lens 301 is not moving. In turn, the safety of use is improved.
請參閱第三圖，一種投影系統100的偵測方法，其步驟包括如下：(1)由控制器70控制光源驅動電路20並使所述光源驅動電路20驅動偵測光源50生成偵測光；(2)由偵測光源50生成的偵測光藉由掃描單元30的微機電鏡片301以掃描方式送出； (3)由微機電鏡片301送出的偵測光由感知器60接受並生成相應的反饋訊號給控制器70；及(4)控制器70接受反饋訊號並判斷微機電鏡片301是否掃描異常而後控制輸出相應偵測結果。 Referring to the third figure, a method for detecting a projection system 100 includes the following steps: (1) controlling the light source driving circuit 20 by the controller 70 and causing the light source driving circuit 20 to drive the detecting light source 50 to generate detection light; (2) The detection light generated by the detecting light source 50 is sent out by the micro-electromechanical lens 301 of the scanning unit 30 in a scanning manner; (3) The detection light sent by the microelectromechanical lens 301 is received by the sensor 60 and generates a corresponding feedback signal to the controller 70; and (4) the controller 70 receives the feedback signal and determines whether the microelectromechanical lens 301 scans abnormally and then controls The corresponding detection result is output.
投影系統100所使用的偵測方法是基於投影系統100投影時微機電鏡片301的擺動特性，即微機電鏡片301可繞空間中的兩相互垂直的軸向上來回往復擺動，為方便描述，本實施例特指如第二圖所示的空間坐標系的X軸和Y軸，進而可使投射於微機電鏡片301上的偵測光經過微機電鏡片301的擺動以掃描的方式送出。 The detection method used by the projection system 100 is based on the swinging characteristic of the microelectromechanical lens 301 when the projection system 100 is projected, that is, the microelectromechanical lens 301 can swing back and forth around two mutually perpendicular axes in the space. For convenience of description, the present implementation The example specifically refers to the X-axis and the Y-axis of the spatial coordinate system as shown in the second figure, so that the detected light projected on the microelectromechanical lens 301 can be sent out by the oscillating motion of the microelectromechanical lens 301.
如上所述，本發明之偵測方法可將偵測光源50送出的偵測光藉由微機電鏡片301的擺動而以掃描方式送出並由感知器60接受，故控制器70可由感知器60送出的反饋訊號判斷偵測微機電鏡片301的運行狀況並輸出偵測結果，從而可避免因微機電鏡片301不動時引起高功率的雷射光長時間照射易燃物或人體上而引起的火災事故或灼傷，進而提高使用安全性。 As described above, the detecting method of the present invention can send the detecting light sent from the detecting light source 50 in a scanning manner by the swing of the microelectromechanical lens 301 and receive it by the sensor 60, so that the controller 70 can be sent by the sensor 60. The feedback signal determines the detection status of the micro electromechanical lens 301 and outputs the detection result, thereby avoiding a fire accident caused by the high power laser light being irradiated to the flammable substance or the human body for a long time when the micro electromechanical lens 301 is not moving or Burns, which in turn increases safety.
10‧‧‧投影成像光源 10‧‧‧Projection imaging light source
101‧‧‧投影成像區域 101‧‧‧Projection imaging area
301‧‧‧微機電鏡片 301‧‧‧Microelectromechanical lenses
50‧‧‧偵測光源 50‧‧‧Detecting light source
501‧‧‧偵測區域 501‧‧‧Detection area
60‧‧‧感知器 60‧‧‧ Sensor
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003279887A (en) * | 2002-03-22 | 2003-10-02 | Nec Viewtechnology Ltd | Dmd projector and video signal correcting method therefor |
| TW200305050A (en) * | 2002-03-22 | 2003-10-16 | Nec Viewtechnology Ltd | Digital mirror device projector and method of controlling amount of light being used in digital mirror device projector |
| US6671005B1 (en) * | 1999-06-21 | 2003-12-30 | Altman Stage Lighting Company | Digital micromirror stage lighting system |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6671005B1 (en) * | 1999-06-21 | 2003-12-30 | Altman Stage Lighting Company | Digital micromirror stage lighting system |
| JP2003279887A (en) * | 2002-03-22 | 2003-10-02 | Nec Viewtechnology Ltd | Dmd projector and video signal correcting method therefor |
| TW200305050A (en) * | 2002-03-22 | 2003-10-16 | Nec Viewtechnology Ltd | Digital mirror device projector and method of controlling amount of light being used in digital mirror device projector |
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