TWI312100B - Projective system and methods for adjusting focus and calibrating image thereof - Google Patents

Description

1312100 IX. Description of the Invention: [Technical Field] The present invention relates to a method for correcting a projection display, and particularly relates to a method for displaying a projection display having an autofocus and keystone correction function, and having a kiE projection display The image color and the compensation control of the backlight. μ [prior art]

1 shows a projection system 100 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 optical engine 5 to generate an image using control signals 13, 14 and 15 to emit light. Before reaching 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 the image is detected by the photodetector 21 and transmitted to the microcontroller 25. This projection system 1 〇〇 mainly monitors the light that is about to enter the projection lens group 23 and is projected out to the screen 24. Therefore, the projection system 100 is a method of internal correction. This conventional technique 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 trapezoidal correction, but the detector used is a higher cost array debt. The detector is, for example, a charge-coupled component (Charge Coupled Device, 0963-A21616TWF (N2); P27950006TW; davidchen 5 1312100 CCD) array wafer or a Complementary Metal-Oxide Semiconductor (CMOS) array wafer. And using the shape discrimination technology to mark the four points and four boundaries of the screen for correction, it is a high-cost patented technology. [Summary of the Invention]

In view of the above, the present invention provides a projection system including an optical device for transmitting an image light and a reflected image light, and a projection device for projecting image light onto a screen and from the screen. The reflected image light is projected onto the optical device, and the optical information device is configured to provide image light according to a brightness control signal, wherein the image light passes through the optical device and the projection device, and a color detector is configured to receive an ambient light. And a reflected image light from the optical device, and generating 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 controller for generating brightness control according to the first brightness signal and the second brightness signal signal. In addition, the present invention provides a focal length correction method for correcting a focal length of a projection system. The focal length correction method includes: projecting a picture with a projected focal length, the picture having an all white area and an all black area, and transmitting the first filter The first filter image is generated by filtering the image of the white area, detecting the first brightness of the first filter image, filtering the image of the black area through the second filter, and generating the second filter image, detecting The second brightness of the two filtered images, and the adjusted focal length, until the difference between the first brightness and the second brightness reaches a predetermined level. In addition, the present invention provides an image trapezoidal correction method for correcting an image of a system. The image trapezoidal correction method includes: projecting an image of a full red area by a chip distance, Through the filter

The light-emitting image produces the first filter image, the _th-遽 image is 1 degree, and the second filter filters the image of the red area. Filtering, optical image, detecting the second brightness of the second filtered image, the root:: a first brightness and the first brightness generating a first ratio, when the first ratio is a first preset value, the projection system The keystone correction is complete. [Embodiment] FIG. 2 shows a projection system that includes color detection 11G, projection device 26, SfLf 35, optical device 4, screen 60, and control $70, in accordance with the present invention. The color detection benefit 10 is composed of a filter u and a photodetector 12. The optical messenger device 35 provides image light 31 according to a brightness control signal 71, wherein the image light 31 passes through the optical device 4 to the projection device %, and the projection device 26 projects the image light 31 onto the screen 6A. The reflected image light 61 from the screen 60 is projected onto the optical device 4''. The optical device reflects the reflected image light 61 to the optical component group 55, and the optical component group % converges the reflected image light 61 onto the color detector 1〇, so that the color detector 10 detects the brightness of the reflected image light 61 and The brightness information 16 is transmitted to the controller %. The optical device 4〇 may 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 diagram showing color detection according to another embodiment of the present invention 0963-A21616TWF(N2); P27950006TW; davidchen 7 1312100

A detailed view of the appearance of the device 10. The color detector 10 includes a filter U and a photodetector 12. The filter 11 is composed of a white filter W11, a red light-receiving sheet R11, a green filter G11, and a blue filter B11. The light detector 12 is composed of a photodetector W12, a photodetector R12, a photodetector G12, and a photodetector B12. In an embodiment, the red filter Rl 1 can be attached to the photodetector R12, the green filter G1 i can be attached to the photodetector G12, and the blue filter B11 can be attached to the photocatalyst. The device B12 and the white filter W11 are attached to the photodetector W12. The red filter R11, the green filter G11, the blue filter b 11 and the white filter W11 are all a square filter and the filter areas are substantially the same, and each optical debt detector R12, G12, B12, W12 The detection area is also roughly the same, as shown in Figure 2. Therefore, each of the photodetectors R12, gi2, B12, and Wl2 can detect 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 Gn and the optical debt are measured as G12 in the upper right corner, the blue filter B11 and the photodetector B12 in the lower right corner, and The white filter W11 and the photodetector w 12 are in the lower left corner. In addition, the color detector 10 may further include other color filters and corresponding photodetectors, 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 light 61 from the optical device 4, and according to the ambient light 62 and the reflected image. Light 61 is used as a background supplement. In addition, the GI 200 has a color correction function, the mirror is set on the projection 1 and the shovel is set to 26, the color detector 1 〇 is to measure the reflected image light 61 from the optical device 4, and the controller 70 is based on the color detector. 1096 provided by 0963-A21616TWF (N2); P27950006TW; davidchen 8 * 1312100 brightness information 16 for color correction of the light source. In addition, the projection system 200 has a focus correction function. In one example, the projection system is selected by the projection device %-the focal length projection is two white, the black image, the light detector (four) is the measurement White filter ^ The image of the white area is generated to produce the first - brightness, green light detector. G12 The green light film filters the shadow of the black area to produce the second brightness, ratio, the first brightness and the second brightness. When the first brightness and the second brightness are different or exceed a predetermined value, the focus is completed. The projection system 200 further has an image trapezoidal correction function. In one embodiment, the projection system and the projection of the system 2000 select a predetermined projection focal length to project an image of a full red area, and the photodetector W12 transmits The white filter W11 extracts the image and generates a first-brightness lighter (10) through the red color. The film R11 detects the image and generates a second brightness, and generates a first ratio according to the second brightness and the first redundancy, and then projects a second brightness. The image of the all-green area, the light detector W12 passes through the white filter, the light film W1H to measure the image and generates the third brightness, and the light picking P detector G12 detects the image through the green filter Gn and generates the fourth brightness, according to the The fourth brightness and the third brightness produce a second ratio, and then an image of a full blue area is projected. The photodetector W12 detects the image through the white filter wu and generates a fifth brightness, and the photometric detector B12 passes through the blue filter. The light sheet BU detects the image and generates a sixth twist, and generates a third ratio according to the sixth brightness and the fifth brightness, and according to the white filter W11, the red filter RU, the green filter G11, and the blue filter. Position distribution of the slice B11 and the first ratio The second ratio and the third ratio, Keystone projection system 2⑻. Figure 4 is a view showing a microlens projection display according to another embodiment of the present invention 0963-A21616TWF(N2): P27950006TW; davidchen 9 1312100

=400. The microlens projection display 4 has an optical information device μ for image light 31, wherein the color wheel 47 controls the color of the image light, and the micro mirror wafer 48 controls the plurality of microlenses to reflect or not reflect the image light, and the light source U white light passes through The color wheel sequentially generates red light, green light, and blue light, and the image is generated by the plurality of microlenses via the micro mirror 48 II. In one embodiment, the color (four) detector U is used to measure the red light, the green light, and the blue light. The % sequence causes the color detector 10 to synchronize with the color wheel 47, and when detecting the strongest color light, simultaneously detects the other two color lights to (4) correct the background light and image color correction, for example: the color wheel 47 When switching to the red filter, the debt is measured at the same time as the strongest red light. 'It can also detect green and blue light at the same time to correct the background light. 'Similarly' the color wheel 47 is turned to the green filter, and the film is detected. At the same time, the strongest green light can also measure blue light and red light at the same time to correct the background light. In addition, when the color wheel 47 is turned to the blue filter, a strong blue light is detected, and the green light can be simultaneously measured. Red light to correct the backlight. In addition, focus correction and image The trapezoidal correction method is the same as that described above. Fig. 5 is a flow chart showing the focal length correction according to another embodiment of the present invention. Here, the red filter R11 and the photodetector R12 are in the upper left corner, and the green filter G1 1 The light detection benefit G12 is in the upper right corner, the blue filter b 11 and the photodetector B12 are in the lower right corner, and the white filter wn and the optical debt detector (four) are in the lower left corner as an example, as shown in Fig. 3. Projection system 2 (8) The projection device % looks at a focal length (S410), projects a picture of the lower half of the white half (s42〇), and the white filter (the first filter) Wn filters the image of the white area to generate a second Filtering the image, the photodetector W (first photodetector) 12 detects the first brightness of the first filtered image (S440), and the green filter (the second filter passes 0963-A21616TWRN2); P27950006TW ;davidchen 10 1312100 'Considers the image of the area, the second filter image (S450), the light detector (first light detector) G12 detects the second brightness of the second filter image (9) (10) '比(四) - brightness and second brightness (S47G), when the difference between the first brightness and the first redundancy is maximum or exceeds a predetermined (S480), that is, the focus is completed (S490), otherwise, the process returns to step S41, and then a focus is newly selected, and the description is repeated until the focus is completed. In another embodiment, the first filter can be a white filter. The first filter may be a red filter moon, so the first $detector detects the brightness of a white area of a picture by a white filter, and the first detection source detects the red filter by a red filter. The brightness of the black area of the picture > When the difference between the brightness detected by the photodetector and the second photodetector is the 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 film, blue filter and red filter. Fig. 6 is a view showing an image trapezoidal correction stream private map according to another embodiment of the present invention. Here, the red filter Ru and the photodetector Ri2 are in the upper left corner, the green filter G11 and the light extractor G12 are in the upper right corner, the blue filter Bn and the photodetector B12 are in the lower right corner, and the white filter wn And the light detector: 12 is in the lower left corner as an example, as shown in Figure 3. The projection device 26 of the projection system 2 projects an image of the all-red region (851〇), and filters the image of the red-red region through the white filter to generate a first filtered image (S51), detecting the first filtered image. The first brightness (S512), and the second filter image is generated by filtering the image of the red area through the red filter (S513), detecting the second brightness of the __ image (S514), and according to the second brightness And the first - 0963-A21616TWF (N2); P27950006TW; davidchen

1312100 The first ratio (S515), projecting an image of a full green area (S520), filtering the image of the green area through the white filter to generate a third filtered image (S521), detecting the third filtered image The third brightness (S522) is generated by 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 (S530), 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 image (S532), while filtering the image of the blue area through the blue filter to generate a sixth filtered image (S533), detecting the sixth brightness of the sixth filtered image (S534), and according to The sixth brightness and the fifth brightness generate a third ratio (S535), and 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 first Three ratio, trapezoidal correction projection system (S536). In another embodiment, 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 (S511) to detect 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 filter (S513), detecting the second brightness of the second filter image (S514), and according to The second brightness and the first brightness produce a first ratio (S515), and the trapezoidal correction projection system is based on 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 an image of a reddish region (S510), and filters the image of the reddish region through the white filter to generate a first filtered image (S511), detecting the 0933- A21616TWF(N2); P27950006TW;davidchen 1312100

a first brightness of the filtered image (S512), and simultaneously 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), and filtering the image of the green area through the white filter to generate a third filtered image (S521), Detecting the third brightness of the third filtered image (S522), and filtering the image of the green area through the green filter and the light film to generate a fourth filtered light image (S523), and detecting the fourth filtered image image. Brightness (S524), and generating a second ratio according to the fourth brightness and the third brightness (S525), and then according to the white filter, the red filter, the light piece and the green filter, the position distribution of the light piece, and the first ratio and the second Ratio, 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 1312100 [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

21~light detector 23~projection lens group 24, 60~screen 25~microcontroller 27~filter 30~light source 50~optical engine 0963-A21616TWF{N2); P27950006TW;davidchen 1312100 ίο~color detector 1卜RU, GH, WU, B11~filter 12, R12, G12, W12, B12~photodetector 26~projection device 32,35~light information device 31~image light 40~optical device

47 to color wheel 48 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 0653-A21616TWF (N2) ;P27950006TW;davidchen 15

Claims (1)

1312100 'No. 95132210, Amendment 10, Patent Application Range: Trial Year of the Month "曰修(more) replacement page 1. A projection system comprising: an optical device for transmitting an image light and a reflection image a projection device for projecting the image light onto a screen and/or projecting the reflected image light from the screen onto the optical device; an optical information device for providing the image according to a brightness control signal _ image light, wherein the image light system penetrates the optical device and the projection device; 9 a color gamma detector for receiving an ambient light and the reflected image light from the optical device, and generating corresponding to the above The ambient light and the brightness of the reflected image light are a first brightness signal and a second brightness signal, and a controller generates the brightness control signal based on the first brightness signal and the second brightness signal. 2. The projection system of claim 1, wherein the color detector further comprises a first photodetector having a white filter, and a first main color filter. a second photodetector, a third photodetector having a second main color filter, and a fourth photodetector having a third main color filter, wherein the photodetector detects the filtering The mirror reflects the image light. 3. The projection system of claim 2, wherein the first primary color is blue, the second primary color is red, and the third primary color is green. 4. The projection system of claim 2, wherein the color and debt detector further comprises a plurality of photodetectors corresponding to the primary color filter. 16 .1312100 % Yearly repair (more) replacement page 5. If the scope of the patent application is used to detect the second = system: the brightness of the above light, the second primary color and the white light. First, the second color of the second color. 6. In the second part of the patent scope, the second device "plays a video, a ^, a projection system, wherein the light and the detector from the optical device detect the ambient light and The reflected image light is used as a background compensation for the illuminating light, and according to the mirror system, further comprising: the above-mentioned reflection of the optical device: the second-shirt detector detects the color correction from the upper, the reflection is read first, and according to the above The reflected image light is as follows: 8. The color-receiving wheel and the lens of the lens as described in the scope of claim i. / ', ,, 'First, and more includes a scale Wei (four) 8 tons of touch, the device detects a first The main color light, a first: the timing of the occurrence, so that the color detector detection and color wheel ^ color light H) · such as the application of the material _ ninth item is pure projection, where the color to - color light, color The detector is side-by-side with two other types of light to compensate for background light and color correction. 11. The projection line described in the item Scope of the application, in which the above example is applied to - LCD projector - One of the microlens wafer projector rear projection displays. The projection system of claim 1, wherein the "learning device" is one of a partial mirror and a polarized beam splitter. - The projection system as described in the scope of the patent application, further comprising - an optical 7G device group, the focus of the image on the focus is focused on the color device. The projection system of claim 1, wherein the projection device further comprises one of a lens group and a mirror group. 15. A focal length correction method for correcting a focal length of a projection system, comprising: projecting a picture with a projected focal length, the picture having an all white area and an all black area; filtering through the first data sheet, the above The first region of the first filter image is detected by the image of the white region; the first brightness of the first filter image is detected; and the image of the black region is transmitted through the k-passer to generate a second filter image; Measuring the second brightness of the second filtered image; and adjusting the projected focal length until the difference between the first brightness and the second brightness reaches a predetermined level. 16. The focal length correction method according to claim 15, wherein the first filter is a white filter, a first primary color filter, a second primary color filter, and a third primary color filter. In one of the light sheets, the second filter is a white filter, a first primary color filter, a second primary color filter, and a third primary color light beam. The focus correction method according to claim 15, wherein the projection system is one of a liquid crystal projector, a microlens wafer projector, and a 1312100 daily repair-rear projection display. The focus correction method according to claim 15, wherein the shadow system includes a projection device for projecting the image, and the above-mentioned doping is further included in the patent application range 1δ. The method of claim 20, wherein the focal length correction method according to claim 19 of the patent application scope is determined by the reflection of the above-mentioned Lai Shi, and the above-mentioned projection ^ image trapezoidal correction method is used to correct the image of the projection system. The method includes: projecting a red image; and generating a first filter to detect a first brightness of the first light image through a first light image; and a second light filter for filtering the full image And generating a second 遽 to detect the second bright image of the second filtered image. And generating a first ratio according to the second brightness and the first center; according to the first filter and the second Ratio, keystone correction above. According to the distribution and the upper 22. The patent application scope method, wherein the first filter is a back image of the trapezoidal correction square/previous slice, the second filter 19 I3l2l〇〇* 曰 repair (more) The replacement page is the image trapezoidal correction filter described in the first-primary color filter item. 23, as in the scope of claim 21 - the method further includes: 'Technique-green image; over-light reduction through the first filter a third brightness that detects the third filtered image is generated by the image, and the fourth image is filtered to generate a fourth filter to detect the fourth filtered image. Brightness; generating a second ratio according to the fourth brightness and the upper ten__ and the degree and the second party degree; transmitting a third filter, the image; the position distribution of the light sheet and the foregoing according to the above A filter and a ratio value, trapezoidal correction of the above projection system. For example, the image trapezoidal correction side described in the 23rd patent area projects a blue image; the fifth filter transmits the blue light image through the first filter; and detects the fifth brightness of the fifth filter image. The sixth filter filters the blue image through a fourth filter to generate an image; detects a sixth brightness of the sixth filtered image; and generates a third ratio according to the sixth brightness and the fifth brightness, 20 1312100 I II The ladder is corrected for the projection system by replacing the page with the year S, the month of the month, and the position distribution of the first and fourth pupils, the light film, and the above-mentioned ratio. 25. The method of claim 24, wherein the third glazing sheet is a second main two-image trapezoidal correction filter is a third main color filter. Color filter first and fourth above