200815900 九、發明說明： 【發明所屬之技術領域】 本發明係有關於一種投影顯示器之校正方法，特別是 有關於-種具有自動對焦與梯形校正功能之投影顯示器= 校正方法，並且具有校正投影顯示器之影像顏色以及背景 光之補償控制等功能。 & 【先前技術】 _ 第1圖係顯示美國專利us 6808270之投影系統1〇〇， 燈源30提供光源並傳送至光學引擎5〇，微控制器25利用 控制信號13、14和15控制光學引擎5〇產生影像，在射出 、光達到投影鏡片組23前，部分反射鏡19a將影像分光，並 經由鏡片20和濾片27傳送至光偵測器21，利用光偵測器 21偵測衫像並產生彳吕號傳送至微控制器25。此投影系統 100主要可監控即將進入投影鏡片組23並投射出至屏幕24 的光，所以投影系統1〇〇是採用内部校正的方法。此傳統 ⑩ 技術可確保投影影像之顏色的真實性，但是不具有環境光 補償、影像自動對焦與影像梯形校正之功能，並且因為部 分反射鏡19a將影像分光，因而造成投影影像之光強度的 衰退。 美國專利US 6846081所使用之技術為在投影鏡頭附 近加上一影像偵測器，此傳統技術具有影像自動聚焦和影 像梯形校正等功能，但所使用之偵測器為成本較高之陣列 式偵測态’例如：電荷|馬合元件（Charge Coupled Device, 0963-A21616TWF(N2)；P27950006TW;davidchen 5 200815900 CCD)陣列晶片或互補金屬氧化物半導體（c〇mplementary200815900 IX. OBJECTS OF THE INVENTION: TECHNICAL FIELD The present invention relates to a method for correcting a projection display, and more particularly to a projection display having a function of autofocus and keystone correction = correction method, and having a corrected projection display The image color and the compensation control of the backlight. & [Prior Art] _ Figure 1 shows a projection system of US Pat. No. 6,808,270, a light source 30 provides a light source and transmits it to an optical engine 5, and the microcontroller 25 controls the optics using control signals 13, 14, and 15. The engine 5 produces an image. Before the light reaches the projection lens group 23, the partial mirror 19a splits the image and transmits it to the photodetector 21 via the lens 20 and the filter 27, and detects the shirt by the photodetector 21. The image is transmitted to the microcontroller 25. The projection system 100 primarily monitors light that is about to enter the projection lens set 23 and is projected out to the screen 24, so the projection system 1 is a method of internal correction. This conventional 10 technology ensures the authenticity of the color of the projected image, but does not have the functions of ambient light compensation, image autofocus and image trapezoidal correction, and because the partial mirror 19a splits the image, the light intensity of the projected image is degraded. . The technique used in US Pat. No. 6,846,081 is to add an image detector near the projection lens. This conventional technology has functions such as image autofocus and image trapezoid correction, but the detector used is a higher cost array detector. Measured state 'for example: charge | horse coupled component (Charge Coupled Device, 0963-A21616TWF (N2); P27950006TW; davidchen 5 200815900 CCD) array wafer or complementary metal oxide semiconductor (c〇mplementary
Metal-Oxide Semiconductor，CMOS)陣列晶片。並且利用形 狀判別技術標出螢幕之四點和四個邊界以作為校正用，為 一南成本之專利技術。 【發明内容】 有鐘於此，本發明提出一種投影系統，上述投影系統 包括一光學裝置，用以傳遞一影像光和一反射影像光、一 ⑩投影裝置，用以將影像光投射至一屏幕上，並將來自屏幕 之反射影像光投射至光學裝置上、一光資訊裝置，用以根 、據一焭度控制信號提供影像光，其中影像光係穿透過光學 、裝置和投影裝置、一色彩偵測器，用以接收一環境光以及 來自光學裝置之反射影像光，並產生分別對應於環境光以 及反射影像光之亮度之第一亮度信號以及第二亮度信號以 及一控制為’根據第一亮度信號以及第二亮度信號產生亮 度控制信號。 馨 另外，本發明提供一種焦距校正方法，用以校正一投 影系統之焦距’上述焦距校正方法包括：以一投射焦距投 射一圖片’圖片具有一全白區域以及一全黑區域、透過第 一濾光片過濾全白區域之影像而產生第一濾光影像、偵測 第一濾光影像之第一亮度、透過第二濾光片過濾全黑區域 之影像而產生第二濾光影像、偵測第二濾光影像之第二亮 度、以及調整投射焦距，直到第一亮度與第二亮度之差異 達到一既定程度。 0963-A21616TWF(N2);P27950006TW；davidchen 6 200815900 另外，本發明提供一種影像梯形校正方法，用以校正 一投影系統之影像，上述影像梯形校正方法包括··以一預 先決定之投射焦距投射一全紅區域之影像、透過第一濾光 片過濾全紅區域之影像而產生第一濾光影像、偵測第一濾 光影像之第一亮度、透過第二濾光片過濾全紅區域之影像 而產生第二濾光影像、偵測第二濾光影像之第二亮度、根 據第二亮度和第一亮度產生一第一比值、當第一比值為一 第一預設值時，投影系統之梯形校正即完成。 【實施方式】 第2圖係顯示根據本發明一實施例所述之投影系統 200，投影系統200包括色彩偵測器10、投影裝置26、光 資訊裝置35、光學裝置40、屏幕60以及控制器70。色彩 偵測器10是由濾片11和光偵測器12所組成的。 光資訊裝置35根據一亮度控制信號71提供影像光 31，其中影像光31穿透過光學裝置40至投影裝置26，投 影裝置26將影像光31投射至屏幕60上。並將來自屏幕 60之反射影像光61投射至光學裝置40上。光學裝置40 反射反射影像光61至光學元件組55，光學元件組55則將 反射影像光61匯聚到色彩偵測器10上，以供色彩偵測器 10偵測反射影像光61之亮度並將亮度資訊16傳送至控制 器70。其中光學裝置40可為部分反射鏡或極化分光稜鏡， 投影裝置26更包括透鏡組或反射鏡組。 第3圖係顯示根據本發明另一實施例所述之色彩偵測 0963-A21616TWF(N2)；P27950006TW；davidchen 7 200815900 器10之外觀細部圖。色彩偵測器10包括濾光片U和光偵 測器12。濾光片11是由白色濾光片W11、紅色濾光片 R11、綠色濾光片G11以及藍色濾光片B11所組成的。光 偵測器12是由光偵測器W12、光偵測器R12、光债測器 G12以及光偵測器B12所組成的。在一實施例中，紅色濾 光片R11可附著在光偵測器R12上、綠色濾光片Gil可附 著在光偵測器G12上、藍色濾光片B11可附著在光偵測器 B12上，以及白色濾光片W11附著在光偵測器W12上。 紅濾光片R11、綠濾光片G11、藍濾光片B11和白濾光片 W11皆為一正方形濾片並且各濾片面積大致相同，各光偵 測器R12、G12、B12、W12之偵測面積也大致相同，如第 2圖所示。因此各光偵測器Rn、G12、B12、W12各可以 4貞測四分之一面積之反射影像光61。從第2圖中得知，紅 濾光片R11和光偵測器R12在左上角、綠濾光片GU和光 偵測器G12在右上角、藍濾、光片b 11和光偵測器b 12在右 下角以及白濾光片W11和光偵測器W12在左下角。除此 之外，色彩偵測器10更可包括其他顏色濾光片和相對應之 光4貞測益，並不限定於藍色、綠色和紅色濾光片。 如第2和第3圖所示，投影系統2〇〇播放一黑影像， 色彩偵測器10偵測環境光62以及來自光學裝置4〇之反射 景夕像光61，並根據環境光62和反射影像光作背景補 償。另外投影系統200更具有色彩校正功能，將一鏡子設 置在投影裝置26前，色彩偵測器10偵測來自光學裝置4〇 之反射影像光61，控制器70根據色彩偵測器1〇所提供之 0963-A21616TWF(N2) ；P27950006TW；davidchen 8 200815900 亮度資訊16作光源之色彩校正。 除此之外’投影系統200更具有焦距校正功能，在_ 實施例中，投影系統200之投影裝置26選定一焦距投射下 半部白上半部黑之影像，光偵測器W12偵測白色濾光片 W11過濾白色區域之影像而產生第一亮度，綠色光偵測器 G12彳貞測綠色濾光片過濾黑色區域之影而產生第二亮度， 比較第一壳度和第二免度，當第一亮度和第二亮度之差異 為最大時或超過一預定值，即對焦完成。 投影系統200更具有影像梯形校正功能，在一實施例 中’投影系統200之投影裝置26選定一預先決定之投射焦 •距投射一全紅區域之影像，光偵測器W12透過白色濾光片 wii偵測影像並產生第一亮度，光偵測器R12透過紅色濾 光片R11偵測影像並產生第二亮度，根據第二亮度和第一 亮度產生第一比值，再投射一全綠區域之影像，光偵測器 W12透過白色濾光片Wl 1偵測影像並產生第三亮度，光偵 測器G12透過綠色濾光片G11偵測影像並產生第四亮度， 根據第四亮度和第三亮度產生第二比值，再投射一全藍區 域之影像，光偵測器W12透過白色濾光片W1丨偵測影像 並產生第五亮度’光债測器B12透過藍色濾光片B11偵測 影像並產生第六亮度，根據第六亮度和第五亮度產生第三 比值，並根據白色濾光片W11、紅色濾光片R11、綠色濾 光片G11和藍色濾光片B11之位置分佈以及第一比值、第 二比值和第三比值，梯形校正投影系統2〇〇。 第4圖係顯示根據本發明另一實施例之微鏡片投影顯 0963-A21616TWF(N2)；P27950006TW；davidchen 9 200815900 示器400。微鏡片投影顯示器4〇〇具有一光資訊裝置％以 傳送影像光3卜其中色輪47控制影像幻】之顏色，微鏡 片晶片48控制複數微鏡片反射或不反射影像光31，燈源 發出白光’經由色輪依序產生紅色光、綠色光和藍色光， 亚經由微鏡片晶片48藉由複數微鏡片產生影像。在一實施 例中’色彩偵測器、10藉由偵測紅色光、綠色光和藍色二之 ，生時序使色彩偵測器1G與色輪47同步，並在偵測到一 _ I強顏色光時’同時偵測另外兩顏色光以即時校正背景光 =影像色彩校正，例如：色輪47轉至紅濾片時，偵測到一 最強紅色光的同時，也可同時偵測綠光和藍光以校正背景 /光’士同理’色輪47轉至綠遽‘片時，偵測到一最強綠色光的 同％，也可同時偵測藍光和紅光以校正背景光，另外，色 =47轉至監濾片時，偵測到一最強藍色光的同時，也可同 時债測綠光和紅光以校正背景光。另外，焦距校正和影像 梯形校正方法和之前所述雷同。 • 第5圖係顯示根據本發明另一實施例之焦距校正流程 圖。在此以紅濾光片R11和光偵測器R12在左上角、綠濾 光=G11和光偵測器G12在右上角、藍濾光片Bu和光偵 測裔B12在右下角以及白濾光片wu和光偵測器wi2在 下角為例，如弟3圖所示。投影系統2〇〇之投影裝置26 選定一焦距（S410)，投射下半部白上半部黑之圖片（S42〇)， =色濾、光片（第一濾光片）W11過濾全白區域之影像而產生 第:濾光影像，光偵測器W(第一光偵測器）12偵測第一濾 光影像之第一亮度（S44〇)，綠色濾光片（第二濾光片）G11過 觸-㈣觸_;防95〇贿w;_chen 200815900 濾^全黑區域之影像而產生第二濾光影像（S45〇)，光偵測器 (第一光偵測器）G12偵測第二濾光影像之第二亮度 (S_)，比較第—亮度和第二亮度(S470)，當第一亮度和第 一冗度之差異為最大時或超過一預定值（S48〇)，即對焦完 成(S490)，反之回到步驟S41〇，再從新選擇一焦距，重複 f述動作直到對焦完成。另—實施例中，第—濾光片可以 疋白色濾光片’第二濾光片可以是紅色濾光片，因此第一 光偵測器藉由白色濾光片制—圖片之白色區域之亮度， ’ f二貞測器藉由紅色濾光片偵測一圖片之黑色區域之亮 度> 田第光偵測器所偵測之亮度和第二光偵測器所偵測 ，.之亮度之差異為最大時，即對焦完成。另外，第一濾光片 可以是白色濾光片、綠色濾光片、藍色滤光片和紅色滤光 片+之者，第二濾光片可以是白色濾光片、綠色濾光片、 監色濾光片和紅色濾光片之另一者。 六第6圖係顯不根據本發明另一實施例之影像梯形校正 瞻肌私圖。在此以紅濾光片R11和光偵測器R12在左上角、 綠濾mil和光偵測器G12在右上角、藍遽光片βιι 和光偵測裔B12在右下角以及白濾光片wu和光偵測哭 在左下角為例，如第3圖所示。投影系統2〇〇之投二 裝置26投射一全紅區域之影像(851〇)，透過白色濾光片過 濾全紅區域之影像而產生第一濾光影像（S5i”，偵測第一 濾、光影像之第-亮度(S512)，同時透過紅色遽光片過滤全 紅區域之影像而產生第二濾光影像（S513) 影像之第二亮度並根㈣ 0963-A21616TWF(N2);P27950006TW；davidchen 200815900 第一比值(S515)，投射一全綠區域之影像（S520)，透過白色 遽光片過濾全綠區域之影像而產生第三濾光影像（S521)， 偵測第三濾光影像之第三亮度（8522)，同時透過綠色濾光 片過濾全綠區域之影像而產生第四濾光影像（S523)，偵測 第四濾光影像之第四亮度（S524)，並根據第四亮度和第三 亮度產生第二比值(S525)，投射一全藍區域之影像（S53〇)， 透過白色濾光片過濾全藍區域之影像而產生第五濾光影像 (S531)，偵測第五濾光影像之第五亮度(S532)，同時透過藍 色濾、光片過濾全藍區域之影像而產生第六濾光影像 (S533)’價測第六濾光影像之第六亮度(S534)，並根據第六 亮度和第五亮度產生第三比值（S535)，再根據白色濾光 片、紅色濾光片、綠色濾光片和藍色濾光片之位置分佈以 及第一比值、第二比值和第三比值，梯形校正投影系統 (S536)。 另一實施例，投影系統200之投影裝置26投射一全紅 區域之影像（S510)，透過白色濾光片過濾全紅區域之影像 而產生第一濾光影像(S5U)，偵測第一濾光影像之第一亮 度（S512) ’同時透過紅色濾光片過濾全紅區域之影像而產 生第二濾光影像（S513)，偵測第二濾光影像之第二亮度 (S514)，並根據第二亮度和第一亮度產生第一比值（S515)， 再根據白色濾光片和紅色濾光片之位置分佈以及第一比 值，梯形校正投影系統。另一實施例，投影系統200之投 影裝置26投射一全紅區域之影像(S51〇)，透過白色濾光片 過濾全紅區域之影像而產生第一濾光影像（S511)，偵测第 0963-A21616TWF(N2)；P27950006TW；davidchen 12 200815900 一濾光影像之第一亮度（S512)，同時透過紅色濾光片過濾 全紅區域之影像而產生第二濾光影像(S513)，偵測第二濾 光影像之第二亮度（S514)，並根據第二亮度和第一亮度產 生第一比值（S515)，投射一全綠區域之影像（S520)，透過白 色濾光片過濾全綠區域之影像而產生第三濾光影像 (S521)，偵測第三濾光影像之第三亮度(S522)，同時透過綠 色濾光片過濾全綠區域之影像而產生第四濾光影像 (S523)，偵測第四濾光影像之第四亮度（S524)，並根據第四 亮度和第三亮度產生第二比值（S525)，再根據白色濾光 片、紅色濾光片和綠色濾光片之位置分佈以及第一比值和 第二比值，梯形校正投影系統。 本發明雖以較佳實施例揭露如上，然其並非用以限定 本發明的範圍，任何熟習此項技藝者，在不脫離本發明之 精神和範圍内，當可做些許的更動與潤飾，因此本發明之 保護範圍當視後附之申請專利範圍所界定者為準。Metal-Oxide Semiconductor, CMOS) array wafer. And using the shape discriminating technique to mark the four points and four boundaries of the screen for correction, it is a patented technology for cost. SUMMARY OF THE INVENTION The present invention provides a projection system including an optical device for transmitting an image light and a reflected image light, and a 10 projection device for projecting image light onto a screen. And projecting the reflected image light from the screen onto the optical device, and an optical information device for providing image light according to a temperature control signal, wherein the image light passes through the optical device, the projection device, and a color The detector is configured to receive an ambient light and reflected image light from the optical device, and generate a first brightness signal and a second brightness signal respectively corresponding to the brightness of the ambient light and the reflected image light, and a control is based on the first The luminance signal and the second luminance signal generate a luminance control signal. In addition, the present invention provides a focal length correction method for correcting a focal length of a projection system. The method for correcting the focal length includes: projecting a picture with a projected focal length. The picture has an all white area and an all black area, and the first filter is transmitted through the first filter. The light film filters the image of the white area to generate the first filtered image, detects the first brightness of the first filtered image, filters the image of the black area through the second filter to generate the second filtered image, and detects The second brightness of the second filtered image and the adjusted projection focus until the difference between the first brightness and the second brightness reaches a predetermined level. 0963-A21616TWF(N2); P27950006TW; davidchen 6 200815900 In addition, the present invention provides an image trapezoidal correction method for correcting an image of a projection system, the image trapezoidal correction method comprising: projecting a predetermined projection focal length The image of the red region is filtered by the first filter to filter the image of the red region to generate a first filtered image, detect the first brightness of the first filtered image, and filter the image of the red region through the second filter. Generating a second filtered image, detecting a second brightness of the second filtered image, generating a first ratio according to the second brightness and the first brightness, and a trapezoidal shape of the projection system when the first ratio is a first preset value The calibration is complete. Embodiment 2 FIG. 2 shows a projection system 200 according to an embodiment of the present invention. The projection system 200 includes a color detector 10, a projection device 26, an optical information device 35, an optical device 40, a screen 60, and a controller. 70. The color detector 10 is composed of a filter 11 and a photodetector 12. The optical information device 35 provides image light 31 in accordance with a brightness control signal 71, wherein the image light 31 passes through the optical device 40 to the projection device 26, and the projection device 26 projects the image light 31 onto the screen 60. The reflected image light 61 from the screen 60 is projected onto the optical device 40. The optical device 40 reflects the reflected image light 61 to the optical component group 55, and the optical component group 55 converges the reflected image light 61 onto the color detector 10 for the color detector 10 to detect the brightness of the reflected image light 61 and The brightness information 16 is transmitted to the controller 70. The optical device 40 can be a partial mirror or a polarized beam splitter, and the projection device 26 further includes a lens group or a mirror group. Figure 3 is a detailed view showing the appearance of color detection 0963-A21616TWF(N2); P27950006TW; davidchen 7 200815900 10 according to another embodiment of the present invention. The color detector 10 includes a filter U and a photodetector 12. The filter 11 is composed of a white filter W11, a red filter R11, a green filter G11, and a blue filter B11. The light detector 12 is composed of a photodetector W12, a photodetector R12, an optical debt detector G12, and a photodetector B12. In an embodiment, the red filter R11 can be attached to the photodetector R12, the green filter Gil can be attached to the photodetector G12, and the blue filter B11 can be attached to the photodetector B12. The upper, and white filter W11 is attached to the photodetector W12. The red filter R11, the green filter G11, the blue filter B11, and the white filter W11 are all a square filter and the filter areas are substantially the same, and the photodetectors R12, G12, B12, and W12 are The detection area is also roughly the same, as shown in Figure 2. Therefore, each of the photodetectors Rn, G12, B12, and W12 can measure the reflected image light 61 of a quarter area. As can be seen from Fig. 2, the red filter R11 and the photodetector R12 are in the upper left corner, the green filter GU and the photodetector G12 are in the upper right corner, the blue filter, the optical sheet b 11 and the photodetector b 12 are The lower right corner and the white filter W11 and the photodetector W12 are in the lower left corner. In addition, the color detector 10 may include other color filters and corresponding light, and is not limited to blue, green, and red filters. As shown in FIGS. 2 and 3, the projection system 2 plays a black image, and the color detector 10 detects the ambient light 62 and the reflected image 61 from the optical device 4, and according to the ambient light 62 and Reflected image light for background compensation. In addition, the projection system 200 further has a color correction function, and a mirror is disposed in front of the projection device 26. The color detector 10 detects the reflected image light 61 from the optical device 4, and the controller 70 provides the color detector according to the color detector 1 0963-A21616TWF (N2); P27950006TW; davidchen 8 200815900 Brightness information 16 for color correction of the light source. In addition, the projection system 200 further has a focus correction function. In the embodiment, the projection device 26 of the projection system 200 selects a focal length to project an image of the upper half of the white half, and the photodetector W12 detects the white. The filter W11 filters the image of the white area to generate the first brightness, and the green light detector G12 measures the green filter to filter the shadow of the black area to generate the second brightness, comparing the first shell degree with the second degree of exemption. When the difference between the first brightness and the second brightness is maximum or exceeds a predetermined value, the focus is completed. The projection system 200 further has an image trapezoidal correction function. In one embodiment, the projection device 26 of the projection system 200 selects a predetermined projection focus to project an image of a full red region, and the photodetector W12 transmits the white filter. Wii detects the image and generates the first brightness. The photodetector R12 detects the image through the red filter R11 and generates a second brightness, and generates a first ratio according to the second brightness and the first brightness, and then projects a full green area. The image detector W12 detects the image through the white filter W1 1 and generates a third brightness. The photodetector G12 detects the image through the green filter G11 and generates a fourth brightness according to the fourth brightness and the third brightness. The brightness produces a second ratio, and then an image of a full blue area is projected. The photodetector W12 detects the image through the white filter W1丨 and generates a fifth brightness. The optical debt detector B12 detects through the blue filter B11. And generating a sixth brightness, generating a third ratio according to the sixth brightness and the fifth brightness, and according to the position distribution of the white filter W11, the red color filter R11, the green color filter G11, and the blue color filter B11, and First ratio The second ratio and the third ratio, Keystone 2〇〇 the projection system. Figure 4 is a diagram showing a microlens projection display 0963-A21616TWF(N2); P27950006TW; davidchen 9 200815900 display 400 in accordance with another embodiment of the present invention. The microlens projection display 4 has an optical information device for transmitting image light 3, wherein the color wheel 47 controls the color of the image, and the microlens wafer 48 controls the plurality of microlenses to reflect or not reflect the image light 31, and the light source emits white light. 'Red, green and blue light are sequentially generated via the color wheel, and images are generated by the microlens wafer 48 via the plurality of microlenses. In one embodiment, the color detector, 10 detects the red light, the green light, and the blue color, and the color timing device 1G synchronizes with the color wheel 47, and detects a strong _I. When color light is used, 'the other two colors of light are detected at the same time to correct the background light=image color correction. For example, when the color wheel 47 is turned to the red filter, a strong red light is detected, and the green light can be detected at the same time. And when the blue light is corrected to the background/light 'synergy' color wheel 47 to the green 遽' film, the same % of the strongest green light is detected, and the blue light and the red light can be detected simultaneously to correct the background light. When color=47 is transferred to the monitor filter, while detecting the strongest blue light, it can also measure the green light and red light at the same time to correct the background light. In addition, the focus correction and image trapezoidal correction methods are the same as previously described. • Fig. 5 is a flow chart showing a focus correction according to another embodiment of the present invention. Here, the red filter R11 and the photodetector R12 are in the upper left corner, the green filter = G11 and the photodetector G12 are in the upper right corner, the blue filter Bu and the light detecting B12 are in the lower right corner, and the white filter wu The photodetector wi2 is exemplified in the lower corner, as shown in the third figure. The projection device 26 of the projection system 2 selects a focal length (S410), projects a picture of the upper half of the white half (S42〇), = color filter, light sheet (first filter) W11 filters the white area The image is generated by a filter image, and the photodetector W (first photodetector) 12 detects the first brightness (S44〇) of the first filter image, and the green filter (the second filter) ) G11 over-touch - (four) touch _; anti-95 bribe w; _chen 200815900 filter ^ all black area image to produce a second filter image (S45 〇), light detector (first light detector) G12 Detect Measuring a second brightness (S_) of the second filtered image, comparing the first brightness and the second brightness (S470), when the difference between the first brightness and the first redundancy is maximum or exceeds a predetermined value (S48〇), That is, the focus is completed (S490), otherwise, the process returns to step S41, and then a focal length is newly selected, and the operation is repeated until the focus is completed. In another embodiment, the first filter may be a white filter. The second filter may be a red filter, so the first photodetector is made of a white filter - a white area of the picture. Brightness, 'f two detectors detect the brightness of a black area of a picture by a red filter> The difference between the brightness detected by the field photodetector and the brightness detected by the second photodetector When it is maximum, the focus is completed. In addition, the first filter may be a white filter, a green filter, a blue filter, and a red filter, and the second filter may be a white filter or a green filter. The other of the color filter and the red filter. Fig. 6 is a diagram showing an image trapezoidal correction according to another embodiment of the present invention. Here, the red filter R11 and the photodetector R12 are in the upper left corner, the green filter mil and the photodetector G12 are in the upper right corner, the blue light film βιι and the light detecting B12 are in the lower right corner, and the white filter wu and the light detection The test is crying in the lower left corner as an example, as shown in Figure 3. The projection device 2 projects the image of the all-red region (851〇), and filters the image of the red-red region through the white filter to generate the first filtered image (S5i), detecting the first filter, The first brightness of the light image (S512), and the second filter image is generated by filtering the image of the red area through the red light film (S513). The second brightness of the image is rooted (4) 0963-A21616TWF(N2); P27950006TW; davidchen 200815900 The first ratio (S515), projecting an image of a full green area (S520), filtering the image of the green area through the white light sheet to generate a third filtered image (S521), detecting the third filtered image Three brightness (8522), at the same time, filtering the image of the green area through the green filter to generate a fourth filtered image (S523), detecting the fourth brightness of the fourth filtered image (S524), and according to the fourth brightness and The third brightness produces a second ratio (S525), projects an image of the all-blue area (S53〇), filters the image of the blue area through the white filter to generate a fifth filtered image (S531), and detects the fifth filter. The fifth brightness of the light image (S532), while passing through the blue filter The light sheet filters the image of the blue area to generate a sixth filtered image (S533), and measures a sixth brightness of the sixth filtered image (S534), and generates a third ratio according to the sixth brightness and the fifth brightness (S535). Then, according to the position distribution of the white filter, the red filter, the green filter, and the blue filter, and the first ratio, the second ratio, and the third ratio, the trapezoidal correction projection system (S536). For example, the projection device 26 of the projection system 200 projects an image of a reddish region (S510), and filters the image of the red region through the white filter to generate a first filtered image (S5U) to detect the first filtered image. The first brightness (S512)' simultaneously filters the image of the reddish region through the red filter to generate a second filtered image (S513), detects the second brightness of the second filtered image (S514), and according to the second brightness And generating a first ratio with the first brightness (S515), and correcting the projection system according to the position distribution of the white filter and the red filter and the first ratio. In another embodiment, the projection device 26 of the projection system 200 projects a Image of the full red area (S51〇), The first filter image is generated by filtering the image of the red area through the white filter (S511), and detecting the first brightness (S512) of the filtered image of the 0963-A21616TWF (N2); P27950006TW; davidchen 12 200815900, Filtering the image of the reddish region through the red filter to generate a second filtered image (S513), detecting a second brightness of the second filtered image (S514), and generating a first ratio according to the second brightness and the first brightness (S515), projecting an image of the all-green area (S520), filtering the image of the green area through the white filter to generate a third filtered image (S521), and detecting the third brightness of the third filtered image (S522) At the same time, the fourth filter image is generated by filtering the image of the green area through the green filter (S523), detecting the fourth brightness of the fourth filter image (S524), and generating according to the fourth brightness and the third brightness. The second ratio (S525), based on the position distribution of the white filter, the red filter and the green filter, and the first ratio and the second ratio, the trapezoidal correction projection system. The present invention has been described above with reference to the preferred embodiments thereof, and is not intended to limit the scope of the present invention, and the invention may be modified and modified without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims.
0963-A21616TWF(N2)；P27950006TW；davidchen 13 200815900 【圖式簡單說明】 第1圖係顯示美國專利US6808270之投影系統。 第2圖係顯示根據本發明一實施例之投影系統。 第3圖係顯示根據本發明另一實施例之色彩偵測器細 部圖。 第4圖係顯示根據本發明另一實施例之微鏡片投影顯 示器。 第5圖係顯示根據本發明另一實施例之焦距校正流程 • 圖。 第6圖係顯示根據本發明另一實施例之影像梯形校正 流程圖。 【主要元件符號說明】 13、14、15〜控制信號 16〜亮度資訊 19a〜部分反射鏡 • 20〜鏡片 21〜光偵測器 23〜投影鏡片組 24、60〜屏幕 25〜微控制器 27〜濾片 3 0〜光源 50〜光學引擎 0963-A21616TWF(N2)；P27950006TW；davidchen 14 200815900 ίο〜色彩偵測器 11、 Rll、Gil、Wll、B11 〜濾片 12、 R12、G12、W12、B12〜光偵测器 26〜投影裝置 32、35〜光資訊裝置 31〜影像光 40〜光學裝置 47〜色輪0963-A21616TWF(N2); P27950006TW; davidchen 13 200815900 [Simplified Schematic] FIG. 1 shows a projection system of US Pat. No. 6,808,270. Figure 2 is a diagram showing a projection system in accordance with an embodiment of the present invention. Fig. 3 is a detailed view showing a color detector according to another embodiment of the present invention. Fig. 4 is a view showing a microlens projection display according to another embodiment of the present invention. Figure 5 is a diagram showing a focal length correction process according to another embodiment of the present invention. Fig. 6 is a flow chart showing an image trapezoidal correction according to another embodiment of the present invention. [Main component symbol description] 13, 14, 15~ control signal 16~ brightness information 19a~ partial mirror • 20~ lens 21~ photodetector 23~ projection lens group 24, 60~ screen 25~ microcontroller 27~ Filter 3 0 ~ light source 50 ~ optical engine 0963-A21616TWF (N2); P27950006TW; davidchen 14 200815900 ίο~ color detector 11, Rll, Gil, Wll, B11 ~ filter 12, R12, G12, W12, B12~ Photodetector 26 to projection device 32, 35 to optical information device 31 to image light 40 to optical device 47 to color wheel
48〜微鏡片晶片 55〜光學元件組 61〜反射影像光 62〜環境光 70〜控制器 71〜亮度控制信號 100、200〜投影系統 400〜微鏡片投影顯示器 0963-A21616TWF(N2)；P27950006TW；davidchen 1548 to microlens wafer 55 to optical element group 61 to reflected image light 62 to ambient light 70 to controller 71 to brightness control signal 100, 200 to projection system 400 to microlens projection display 0963-A21616TWF (N2); P27950006TW; davidchen 15