CN110867150A

CN110867150A - Intelligent rear projection television wall and method for regulating and controlling color and brightness uniformity thereof

Info

Publication number: CN110867150A
Application number: CN201810979677.2A
Authority: CN
Inventors: 魏声光; 冯圣壹
Original assignee: Lumens Digital Optics Inc
Current assignee: Lumens Digital Optics Inc
Priority date: 2018-08-27
Filing date: 2018-08-27
Publication date: 2020-03-06

Abstract

The invention provides a method for regulating and controlling color and brightness uniformity of an intelligent rear projection television wall in real time, wherein the intelligent rear projection television wall is composed of a plurality of intelligent rear projection television units, each intelligent rear projection television unit comprises a projection light machine and a screen, each projection light machine is provided with an optical sensor and is configured to provide an optical sensing signal, and the method comprises the following steps: providing a spectrum measuring device for respectively obtaining a group of screen color brightness uniformity correction values and basic color correction values of each intelligent rear projection television unit, wherein each group of screen brightness uniformity correction values comprises corresponding brightness correction values at different positions on the screen of the intelligent rear projection television unit; continuously compensating by the projector of each intelligent rear projection television unit according to the corresponding basic color correction value and the optical sensing signal to maintain the color of the intelligent rear projection television unit; selecting a first intelligent rear projection television unit from the plurality of intelligent rear projection television units, and setting the rest as a second intelligent rear projection television unit; and the projector of the first intelligent rear projection television unit transmits the optical sensing signals from the second intelligent rear projection television units to regulate and control the brightness of the second intelligent rear projection television units so as to continuously maintain the brightness uniformity of the whole screen of the intelligent rear projection television wall.

Description

Intelligent rear projection television wall and method for regulating and controlling color and brightness uniformity thereof

Technical Field

The invention relates to a method for regulating and controlling optical uniformity of an intelligent rear projection television wall in real time, in particular to an intelligent rear projection television wall and a method for regulating and controlling color and brightness uniformity of the intelligent rear projection television wall.

Background

In order to realize image display of a large screen, it is a mainstream technology to complete a video wall by splicing a plurality of display devices. Because the plurality of display devices are used for simultaneously displaying different blocks forming a single picture, the brightness and the color of the display devices must be coordinated, so that a user can watch the television wall in a normal and comfortable way; in other words, if the brightness and color of the display devices of the video wall cannot be coordinated, the display devices will play the picture with different brightness and color, so that the user will obviously feel the incoordination of the whole picture when watching the whole video wall.

The non-uniformity of the brightness and color of the tv wall is caused by the different light intensities and color deviations of the three color light sources of each display device, and the additional extinction and color deviations of the optical transmission components disposed on the optical path, which results in the original brightness and color differences among the display devices. As the display device continues to be used, the light emitting elements also experience brightness decay and color shift over time, further deteriorating the uniformity of the tv wall with respect to brightness and color. There is also a problem of color brightness uniformity for different locations of a single television picture.

In the conventional technology, in order to make the whole picture of the video wall display uniformly, the most common way at present is to adjust the video wall manually. Specifically, in order to uniformly display the picture on the television wall, the display device in the television wall which needs to be adjusted can be determined by manual observation and adjusted accordingly. However, since different operators have different perceptions of brightness and color, this situation will cause the adjustment display effect of the tv wall to be different by human judgment. In order to solve the error caused by manual judgment, the television wall can also be adjusted by manually matching with a standard measuring instrument (meter), and the display equipment is adjusted by a manual mode according to the measurement result of the standard measuring instrument, so that the error caused by manual judgment can be reduced by the state of the display equipment measured by the instrument. However, the adjustment of the tv wall still needs to be performed manually, so that the time required for the tv wall to have the display devices increases and the difficulty of the adjustment increases.

In addition, in order to enhance the image quality of a large-screen display device, many people adopt a rear projection television as a unit display device, and a rear projection television apparatus projects a screen by disposing a projection light similar to a projector on the rear side of a screen. Some contrived to arrange a color sensor at a light source position of the projector, so as to measure color gamut coordinates of three color lights in the light source in real time during use, and control the light source through a processor to maintain the color gamut coordinates of each color light within a preset reference value. The technology can avoid manual adjustment of individual color uniformity, but cannot overcome the problem of uneven brightness among display devices and at different positions on a single display screen; furthermore, it is difficult to understand the variation caused by the extra extinction and color shift of the optical transmission component on the optical path in the above method for correcting the color of the light source.

Therefore, in view of the defects of the prior art, the applicant invented the "intelligent rear projection television wall and the method for regulating and controlling the brightness uniformity in real time" in the present application to improve the above defects.

Disclosure of Invention

One aspect of the present invention provides a method for adjusting and controlling color and brightness uniformity of an intelligent rear projection television wall in real time, wherein the intelligent rear projection television wall is composed of a plurality of intelligent rear projection television units, each intelligent rear projection television unit comprises a projection light machine and a screen, each projection light machine is provided with an optical sensor configured to provide an optical sensing signal, and the method comprises the following steps: providing a spectrum measuring device for respectively obtaining a group of screen brightness uniformity correction values and basic color correction values of each intelligent rear projection television unit, wherein each group of screen brightness uniformity correction values comprises corresponding brightness correction values at different positions on the screen of the intelligent rear projection television unit; continuously compensating by the projector of each intelligent rear projection television unit according to the corresponding basic color correction value and the optical sensing signal to maintain the color of the intelligent rear projection television unit; selecting a first intelligent rear projection television unit from the plurality of intelligent rear projection television units, and setting the rest as a second intelligent rear projection television unit; and the projector of the first intelligent rear projection television unit transmits the optical sensing signals from the second intelligent rear projection television units to regulate and control the brightness of the second intelligent rear projection television units so as to continuously maintain the brightness uniformity of the whole screen of the intelligent rear projection television wall.

Another aspect of the present invention provides an intelligent rear projection television wall, comprising a plurality of intelligent rear projection television units, each of the intelligent rear projection television units comprising a screen and a projector, the projector comprising: a digital micromirror device configured to project an image on the screen; the three-color light source set respectively emits a first color light, a second color light and a third color light, and the first color light, the second color light and the third color light are projected on the screen along a light path after being configured and combined; an optical sensor configured to obtain first optical measurement data, second optical measurement data, and third optical measurement data corresponding to the first color light, the second color light, and the third color light, respectively; the light source driving device is electrically connected with the group of three-color light sources; and a digital optical modulation module, electrically connected to the optical sensor, the light source driving device, and the digital micromirror device, configured to receive an image input signal related to the image and the first, second, and third optical measurement data from the optical sensor, and to transmit a digital image signal to the digital micromirror device according to the image input signal, wherein: the digital optical regulation and control module continuously corrects the digital image signal according to a group of screen optical uniformity default correction values corresponding to different positions on the screen of the intelligent rear projection television unit so as to maintain the brightness uniformity of individual screens of the intelligent rear projection television unit; the digital optical regulation and control module compensates to maintain the color of the intelligent rear projection television unit through the digital image signal according to a plurality of basic color correction values corresponding to the intelligent rear projection television unit and the first, the second and the third optical measurement data; one of the plurality of intelligent rear projection television units is defaulted as a first intelligent rear projection television unit, and the other intelligent rear projection television units are defaulted as second intelligent rear projection television units; and the digital optical regulation and control module in the first intelligent rear projection television unit transmits the brightness regulation and control of each digital optical regulation and control module of each second intelligent rear projection television unit according to the optical measurement data from each second intelligent rear projection television unit so as to continuously maintain the brightness uniformity of the whole screen of the intelligent rear projection television wall.

Another aspect of the present invention provides a method for real-time controlling optical parameters of an intelligent rear projection television wall, wherein the intelligent rear projection television wall is composed of a plurality of intelligent rear projection television units, and the method comprises the following steps: selecting one of the plurality of intelligent rear projection television units as a main intelligent rear projection television unit; making the other intelligent rear projection television units as slave intelligent rear projection television units; detecting optical sensing signals of each intelligent rear projection television unit related to the optical parameters, wherein the optical sensing signals are obtained from each intelligent rear projection television unit; and collecting each optical sensing signal by the main intelligent rear projection television unit to regulate and control the optical parameters, so that the intelligent rear projection television wall continuously maintains the uniformity on the whole screen of the intelligent rear projection television wall in terms of the optical parameters.

The device and the method of the invention can utilize lower cost, avoid the error and time consumption of manual operation, continuously maintain the uniformity of the brightness and the color of the television wall in the using process, have industrial utilization and have excellent efficacy.

Drawings

FIG. 1: the invention discloses a schematic diagram of an embodiment of an intelligent rear projection television wall.

FIG. 2: the invention discloses a schematic diagram of an embodiment of an intelligent rear projection television unit.

FIG. 3A: the invention discloses a projection optical machine.

FIG. 3B: the invention is a schematic diagram of another embodiment of a projection light engine.

FIG. 4A: the invention discloses a schematic diagram of an embodiment for distinguishing different positions on a screen of an intelligent rear projection television unit.

FIG. 4B: a schematic diagram of a set of initial luminance data obtained according to the embodiment shown in fig. 2 and 4A.

FIG. 4C: after the correction by the method, a group of luminance measurement value schematic diagrams on the corresponding position of the screen are obtained.

FIG. 5A: the invention discloses a schematic diagram of an embodiment of a method for regulating and controlling color uniformity of an intelligent rear projection television wall.

FIG. 5B: the invention discloses a schematic diagram of another embodiment of an intelligent rear projection television wall.

FIG. 6A: examples the values of the individual optical parameters of each intelligent rear projection television unit before the overall optical correction has not been performed.

FIG. 6B: the values of the individual optical parameters of each intelligent rear projection television unit after the overall color correction is completed are illustrated.

FIG. 6C: the values of the individual optical parameters of each intelligent rear projection television unit after the overall optical correction is completed are illustrated.

FIG. 6D: the present invention is a numerical diagram of the gamut coordinates x and y before and after color compensation.

Detailed Description

The detailed description of the embodiments of the invention is as follows, however, the invention can be broadly practiced in other embodiments in addition to the detailed description. That is, the scope of the present invention should not be limited by the examples provided, but should be defined only by the claims provided below.

Referring to fig. 1, an embodiment of an intelligent rear projection video wall according to the invention is shown. For convenience of description, the intelligent rear projection television wall 10 is formed by an array of 4 intelligent rear projection television units 100, and those skilled in the art can select an appropriate number of intelligent rear projection television units 100 to form a television wall according to actual needs. Fig. 1 shows a common rectangular plane formed by the screens 150 of 4 intelligent rear projection tv units 100, and the screens 150 located in the quadrants on the plane can respectively display images scheduled to appear in the quadrants of the screen by the image projection of a rear projection optical machine (not shown), and then combine into a whole screen.

Fig. 2 illustrates an embodiment of the internal configuration of the intelligent rear projection television unit 100 in the intelligent rear projection television wall and the optical correction of the intelligent rear projection television unit 100 according to the present invention. The intelligent rear projection television unit 100 has a projector 110, an image mirror 130, and a screen 150. In actual operation, the projection optics 110 projects the image I to the image mirror 130 through the optics lens 118 along the optical path shown by the dotted line, and then the image I is reflected to the screen 150 through the image mirror 130 for imaging. The arrangement of the components shown in fig. 2 is only a simple example, and one skilled in the art can design other optical paths according to different needs, such as adding one or more image mirrors (not shown), or eliminating the image mirror 130 to allow the image I to be directly projected from the optical lens 118 to the screen 150.

Fig. 3 illustrates an embodiment of the internal configuration and operation of the projector 110 in the intelligent rear projection television unit 100 according to the present invention. The position of elements in the figures is shown as an illustrative configuration for ease of illustration, and those skilled in the art can make partial changes based on the example of fig. 3 without departing from the scope of the present invention.

According to an embodiment of the present invention, the projection light engine 110 has a set of three-color light sources 112R/112G/112B, a light source driving Device 111 electrically connected to the set of three-color light sources, and a color-light mirror set 113R/113G/113B, an integrator (integrator rod)114, a lens set 115, a prism set 116, a Digital Micro-mirror Device (DMD) 117 and an optical lens 118 disposed along a light path (indicated by an arrow). As shown, under the control of the light source driving device 111, the three-color light sources 112R/112G/112B respectively emit a first color light (e.g., red light), a second color light (e.g., green light), and a third color light (e.g., blue light), and the first, the second, and the third color lights are respectively reflected by the color light mirror sets 112R/112G/112B to enter together toward the left end of the rectangular prism-shaped optical integrator 114.

Before entering the rectangular optical integrator 114, the intensity distribution of the light pillar formed by the first, the second or the third color light is stronger in the middle and weaker in the periphery, as illustrated by the intensity distribution of the light pillar shown in the upper left of fig. 3. After passing through the rectangular rod integrator 114, the light beam formed by the first, second or third color lights can form a light beam with a slightly approximately rectangular intensity distribution, as illustrated by the intensity distribution of the light beam shown directly above in fig. 3. The prism assembly 116 has a total reflection angle, and the light guided out from the rectangular prism type optical integrator 114 passes through the lens assembly 115, and is configured to enter the prism assembly 116 at an incident angle greater than the total reflection angle, and is projected to the DMD117 by the prism assembly 116. The DMD117 surface has an array of micro mirrors (not shown) that can be reflected at different angles at different positions to form the image I, which is finally projected through the optical lens 118. The incident angle of the light reflected by DMD117 passing through prism set 116 again is smaller than the total reflection angle, so most of the light can pass through prism set 116 directly.

In order to realize a color image, the light before being projected to the DMD117 can be selected to only illuminate one of the three color light sources 112R/112G/112B generating the first, the second or the third color light within a very short period of time, or configured to allow one of the first, the second or the third color light to pass through, and then the formed image I will only have one color. If the light sources with different colors are switched continuously in a very short time, the function of vision persistence of human eyes is utilized, so that the naked eyes can see a color picture jointly formed by three-color images on the screen.

Although the intensity distribution of the light beam transmitted from the rectangular column type optical integrator 114 is close to rectangular, that is, the intensity difference of the light beam at different positions along the horizontal axis (left and right) or the vertical axis (up and down) is not large, the spatial uniformity is far better than the state of the light beam entering the rectangular column type optical integrator 114, however, the method still has disadvantages. Moreover, the first, second or third color lights from the three-color light sources 112R/112G/112B are inevitably subjected to different color shifts after passing through the optical elements. These are problems that the prior art has not overcome. If only the intensity and color shift of the light source are measured and corrected, the variations of brightness and color on the screen due to the many optical components inside each intelligent rear projection television unit 10 cannot be known.

Please continue to refer to fig. 3A. According to an embodiment of the present invention, the projection light engine 110 of the intelligent rear projection television unit 100 further has an optical sensor 121A disposed on one side of the light path (preferably, on one side of the lens assembly 115) to continuously obtain integrated optical data DA, which includes first optical measurement data, second optical measurement data, and third optical measurement data corresponding to the first color light, the second color light, and the third color light, respectively. The content of the integrated optical data DA includes measurement data of the intensity or energy of each wavelength of light covering the visible wavelength range, and analyzing these data can know whether the color of each color light is balanced or whether any color shift phenomenon exists, and can also know the degree of attenuation of the light source intensity. According to another embodiment of the present invention, referring to fig. 3B, a set of optical sensors 121R/121G/121B disposed on one side of the optical path (as shown, disposed on one side of the lens assembly 115) may be used to obtain first optical measurement data DR, second optical measurement data DG, and third optical measurement data DB corresponding to the first color light, the second color light, and the third color light, respectively, wherein the optical measurement data individually display measurement data related to the intensity or energy of adjacent color light wavelength lights in the visible light wavelength range, and whether the color of each color light is balanced or any color shift phenomenon can be known by analyzing the data, and the attenuation degree of the intensity of each color light source can also be known. The measuring range of the optical sensor 121 covers the wavelength range of visible light, and the optical sensor 121R, the optical sensor 121G and the optical sensor 121B are respectively focused on the wavelength ranges of the first color light, the second color light and the third color light, so the measuring effects are different.

The projection light engine 110 is further configured with a digital optical adjusting and controlling module 125 electrically connected to the optical sensor 121A or 121R121G/121B, light source driving device 111, and DMD 117. As shown, the digital optical conditioning module 125 is configured to receive the image input signal Iinput related to the image I and the optical measurement data (the integrated optical data DA or the first optical measurement data DR, the second optical measurement data DG, and the third optical measurement data DB) from the

optical sensor

121A or 121R/121G/121B. The image input signal Iinput is usually from an image player (not shown), and the digital optical conditioning module 125 sends the processed digital image signal Idigital to the DMD117 according to the image input signal Iinput, so that the DMD generates a specific configuration of its internal micro mirror array according to the indication of the digital image signal Idigital, and reflects the light from the prism array 116 to finally project the image I. The digital optical modulating module 125 has a central processing unit CPU125A, a uniformity modulating unit 125B, and a color processing unit 125C electrically connected to each other. The CPU125A is responsible for inter-unit communication and parameter setting of internal image processing; the uniformity control unit 125B continuously corrects the color/brightness uniformity of the respective screens of the intelligent rear projection tv unit 110 by the digital image signal Idigital according to a set of default correction values of the optical uniformity of the screens corresponding to different positions on the screen 150 of the intelligent rear projection tv unit 110; the color processing unit 125C operates to obtain the tristimulus ratios of the light sources and any color shift information according to the basic color correction values corresponding to the intelligent rear projection TV unit 110 and the optical sensing signals (the integrated optical data DA or the first optical measurement data DR, the second optical measurement data DG, and the third optical measurement data DB) from the

optical sensors

121A or 121R/121G/121B, and then transmits the color light intensity signal L_RGBThe light source driving device 111 is instructed to adjust the intensity of the set of three color light sources 112R/112G/112B, or continuously compensate through the digital image signal Idigital to maintain the color balance of the respective screens of the intelligent rear projection television unit 110, and correct any color cast. Digital image signal Idigital and color light intensity signal L_RGBUsually, a two-bit Pulse Width Modulation (Pulse Width Modulation) signal is used, and other signals such as Pulse amplitude Modulation (Pulse amplitude Modulation) or Pulse Code Modulation (Pulse Code Modulation) can be selected) Such as modulated signals.

Fig. 4A illustrates an embodiment of distinguishing different locations on the screen 150 of the intelligent rear projection television unit 110 in accordance with the present invention. For convenience of description, the surface of the screen 150 is divided into 5 rows and 5 columns with 25 different blocks 11-15/21-25/31-35/41-45/51-55, and those skilled in the art can use other methods to distinguish different positions on a surface. Referring to fig. 2 and 4A, the intelligent rear projection television unit 100 of the present invention can perform optical calibration before shipment, and under the control of the calculator 300, the spectrum measuring devices 200 (e.g., spectrometers) can be sequentially disposed in different blocks 11-15/21-25/31-35/41-45/51-55 on the surface of the screen 150 to respectively measure optical data corresponding to the positions of the blocks. The spectrum measuring device 200 can obtain optical measurement data of the intensity or energy of each wavelength of light covering the visible wavelength range, analyze the obtained optical measurement data to calculate the brightness of the block position, and also calculate the white color gamut coordinate value of the surface of the screen 150 of the intelligent rear projection television unit 100.

According to an embodiment of the present invention, during the process of performing optical calibration before shipping, the spectral measurement apparatus 200 may perform calibration on the first color light, the second color light, and the third color light, respectively, obtain a calibration data to obtain a comparison table of brightness differences of three colors of the smart rear projection television unit 100, and record the data difference between the actual measurement value and the optical sensing signal (the integrated optical data DA or the first optical measurement data DR, the second optical measurement data DG, and the third optical measurement data DB). The color gamut coordinates of the respective first color light, the second color light and the third color light of the corrected intelligent rear projection television unit 100 measured on the screen 150 are also recorded during the optical correction process. These correction data are stored by the digital optical control module 125 in the intelligent rear projection television unit 100 for a long time as a basis for controlling the color brightness later.

Fig. 4B is a set of initial brightness data corresponding to the positions of the blocks sequentially obtained when the blocks on the surface 150 of the smart rear projection tv unit 100 are set to display the same brightness according to the embodiment shown in fig. 2 and 4A. As can be seen from the data in the figure, the light intensity projected on the surface of the screen 150 near the center (e.g., the block 33 in fig. 4A) and the light intensity data at the corner (e.g., the

block

11 or 15 in fig. 4A) are different by about 20%, and such brightness difference can be immediately recognized by the naked human eye, so the brightness uniformity on the screen needs to be improved.

According to an embodiment of the present invention, the uniformity control unit 125B in the digital optical control module 125 can be utilized to perform estimation according to the initial brightness data as shown in fig. 4B, so as to obtain a set of default correction values of the screen optical uniformity corresponding to different positions on the screen 150 of the intelligent rear projection television unit 100. Since the optical components disposed in each of the intelligent rear projection tv units 100 may cause differences in optical uniformity, each of the intelligent rear projection tv units 100 should have a unique set of default correction values for screen optical uniformity after the above-mentioned correction, which are stored in the digital optical conditioning module 125, and then the set of default correction values for screen optical uniformity may be added to the processed image data to indicate to the DMD170 via the digital image signal Idigital, so as to maintain the respective screen brightness uniformity of the intelligent rear projection tv units 110. Fig. 4C shows a set of brightness measurements at corresponding positions on the screen 150 after the above correction. From the data in the figure, the difference of the light intensity data projected on the screen 150 at different positions is within 4%, and the brightness difference is not distinguishable by human eyes, so the brightness uniformity on the screen reaches the ideal state. The brightness uniformity on the individual screens can then be continuously maintained by the intelligent rear projection television unit 100 using the digital optical conditioning module 125 disposed therein.

Regarding the color correction of the screen 150 of the intelligent rear projection television unit 110, according to another embodiment of the present invention, when the standard white light is set to be displayed on the screen 150 of the intelligent rear projection television unit 100, the spectrum measuring device 200 disposed in front of the screen 150 can obtain the optical measurement data of the intensity or energy of each wavelength of light covering the visible wavelength range. The white light on the projection screen is generally formed by three colors of light with standard wavelengths of 620 nm (red), 525 nm (green) and 460 nm (blue) under a balanced condition, and the white area is located near the center in the CIE 1931xy color gamut space of the standard known in the art, such as white light with a color temperature of 7500K (xy) ═ 0.2999,0.3151) and white light with a color temperature of 6500K (xy) ═ 0.3126, 0.3291). In other words, the values of the gamut coordinates x and y are both approximately around 0.3. Accurate optical measurement data can be obtained from the spectral measuring device 200, and relative color gamut coordinate values can be deduced. If the white light on the surface of the display screen 150 is color-shifted according to the data measured by the spectrum measuring device 200, i.e. at least one of the values of the relative color gamut coordinates x and y is far from about 0.3, the color processing unit 125C in the intelligent rear projection television unit 110 can correct the color by compensation, so that the values of the color gamut coordinates x and y calculated according to the measured data of the target color (white light) appearing on the screen 150 are close to about 0.3. Fig. 6D shows a plurality of values of the color gamut coordinates x and y before and after compensation. In the correction process, when the values of the compensated color gamut coordinates x and y meet the specification, the color processing unit 125C may compare the optical sensing signals (the integrated optical data DA or the first optical measurement data DR, the second optical measurement data DG, and the third optical measurement data DB) from the

optical sensors

121A or 121R/121G/121B, and estimate and store a base color correction value corresponding to the intelligent rear projection television unit 110.

Then, the digital optical adjusting and controlling module 125 can maintain the color of the intelligent rear projection television unit 110 by a compensation method through the digital image signal Idigital or a method of adjusting and controlling the light intensity of the three-color light sources 112R/112G/112B through the signal light source driving device 111 according to the corresponding basic color correction value and the optical sensing signals. The digital video signal Idigital may include a correction instruction for correcting color or brightness in addition to the content derived from the video input signal Iinput. The micromirrors at different positions on the DMD117 can adjust the ratio of the switching time periods of the micromirrors according to the correction command, for example, the time period of the micromirrors in the central area being turned off is changed to decrease the brightness of the central area; or in the period of time that a certain color light is projected on the DMD117, the ratio of the on-off period of the bit micro mirror is changed integrally to adjust the ratio of the color light to other color lights, so as to achieve the purpose of adjusting the color uniformity. The same concept applies to the brightness control described in fig. 4A-4C, which locally increases or decreases the brightness of a certain area on the screen.

In summary, after being calibrated before factory shipment, any one of the intelligent rear projection television units 110 in the intelligent rear projection television wall of the present invention can maintain uniformity of color and brightness of a picture at startup. Since the calibration is performed directly on the screen using the accurate spectrum measuring device 200, the color and brightness data most suitable for the actual use can be obtained, and the basic color correction value and the screen brightness uniformity correction value obtained by calibration are unique to the individual intelligent rear projection tv unit 110 and can be used to continuously maintain the standard color and brightness of the screen. Through the correction process, the digital optical conditioning module 125 of each intelligent rear projection television unit 110 can also obtain the error between the measurement data of the

optical sensor

121A or 121R/121G/121B and the spectrometer standard, and after a plurality of intelligent rear projection television units 110 form the television wall 10, the measurement data from the

optical sensors

121A or 121R/121G/121B in different intelligent rear projection television units 110 can be utilized to perform overall adjustment, so as to maintain the uniformity of color and brightness among the plurality of intelligent rear projection television units 110.

Referring to fig. 5A, an embodiment of a method for adjusting and controlling color uniformity of an intelligent rear projection tv wall according to the present invention is shown, in which two simplest intelligent rear projection tv units 100 are used as an example to form the intelligent rear projection tv wall, and each unit is respectively denoted by 101 and 102 for distinction. When the two intelligent rear

projection television units

101 and 102 are combined, colors need to be made to be consistent, as shown in the figure, in a standard CIE 1931xy color gamut space, the color gamut coordinate positions of the first color light (red), the second color light (green) and the third color light (blue) actually measured by the intelligent rear projection television unit 101 during the initial pre-factory unit correction are displayed by the vertexes (101R, 101G, 101B) of a triangle shown by a solid line; the vertices (102R, 102G, 102B) of the triangle shown by the dashed lines show the color gamut coordinates of the first color light (red), the second color light (green), and the third color light (blue) actually measured by the intelligent rear projection television unit 102 during the initial factory pre-unit calibration. The colors on the screen of any intelligent rear projection television unit are generated by the combination of the three colors of light, so that any color formed by the three colors of light basically falls within a triangle formed by the color gamut coordinate positions of the three colors of light.

According to an embodiment of the present invention, in order to make the colors of the plurality of intelligent rear projection television units 100 consistent after forming the television wall, the digital optical adjustment and control module 125 in each intelligent rear projection television unit 100 may compare the color gamut coordinate positions of the first, second, and third color lights of each intelligent rear projection television unit 100 according to the factory before-factory unit calibration data of each intelligent rear projection television unit 100, and further determine a common color gamut coordinate position of the first, second, and third color lights. The triangular area shown by oblique lines in the figure is the intersection area of two triangles of the solid line and the dashed line, and can be regarded as the color gamut coordinate positions of the first, second and third color lights which are common after the television wall is formed. The vertex coordinate positions of the triangular regions shown by the oblique lines in fig. 5A are the gamut coordinate position 100R of the common first color light, the gamut coordinate position 101G of the second color light of the intelligent rear projection television unit 101, and the gamut coordinate position 101B of the third color light of the intelligent rear projection television unit 101, respectively. The color gamut coordinate values of any point of this intersection region can be implemented in respective color light combinations on the screen of the intelligent rear projection television unit 101 or the intelligent rear projection television unit 102, respectively. In this way, the colors of the intelligent rear projection television units 100 behind the television wall can be maintained with a certain uniformity.

Referring to fig. 5B, another embodiment of the intelligent rear projection video wall 20 according to the invention is shown. When the plurality of intelligent rear projection television units 110 form a video wall, the optical sensing signals measured inside each intelligent rear projection television unit 110 can be shared with each other, and the digital optical control modules 121 can communicate with each other. In order to maintain the uniformity of color and brightness among the intelligent rear projection television units 110 and make the color and brightness of the whole picture consistent, the invention selects the first intelligent rear projection television unit 000 from the plurality of intelligent rear projection television units 110 as the main intelligent rear projection television unit, and sets the rest as the second intelligent rear projection television units (or called as the auxiliary intelligent rear projection television units) 001-008.

For convenience of explanation, the intelligent rear projection television unit 110 located at the central position is selected as the first (main) intelligent rear projection television unit 000 in the figure, and practically any other intelligent rear projection television unit 110 may be selected as the first (main) intelligent rear projection television unit 000. The digital optical control module 125 in each intelligent rear projection tv unit 110 maintains the uniformity of color and brightness of its respective screen, and the first (master) intelligent rear projection tv unit 000 is responsible for communicating the brightness control of each second intelligent rear projection tv unit according to the optical sensing signals (integrated optical data DA or first optical measurement data DR, second optical measurement data DG, and third optical measurement data DB) from each second (slave) intelligent rear projection tv unit to establish the overall screen brightness uniformity of the intelligent rear projection tv wall 10. According to an embodiment of the present invention, the first (master) intelligent rear projection tv unit 000 can communicate each second (slave) intelligent rear projection tv unit to perform brightness control according to the optical sensing signals (the integrated optical data DA or the first optical measurement data DR, the second optical measurement data DG, and the third optical measurement data DB) from each second intelligent rear projection tv unit, so as to continuously maintain the overall screen brightness uniformity of the intelligent rear projection tv wall.

As the usage time of the intelligent rear projection tv wall 20 increases, the light sources in each intelligent rear projection tv unit 110 continuously attenuate, but the attenuation states of the light sources are not consistent, so the first (master) intelligent rear projection tv unit 000 must continuously collect the optical sensing signals (the integrated optical data DA or the first optical measurement data DR, the second optical measurement data DG, and the third optical measurement data DB) from each second (slave) intelligent rear projection tv unit, monitor the light intensities of all the light sources according to the optical sensing signals, and appropriately communicate the digital optical control module 125 inside each second intelligent rear projection tv unit to perform individual brightness control so as to continuously maintain the overall screen brightness uniformity of the intelligent rear projection tv wall 20. The method for color and brightness control by the digital optical control module 125 is described in the previous paragraphs, and will not be repeated here.

Fig. 6A-6C illustrate the process and results of the present invention for regulating the intelligent rear projection tv wall 20 shown in fig. 5 using a simple example. Fig. 6A shows the values of the individual luminance (Lum) and the individual target color (white) gamut coordinate x/y before the overall color correction is not performed on each of the intelligent rear projection tv units 000-008 of the intelligent rear projection tv wall 20, in which the luminance value range of each of the intelligent rear projection tv units 110(ID 000-008) is 11%, and the value ranges of the target color (white) gamut coordinates x and y are 0.008 and 0.018, respectively. Fig. 6B shows the values of the individual optical parameters of each intelligent rear projection television unit 110(ID 000-008) after the overall color correction is completed, in which the brightness value range of each intelligent rear projection television unit 110(ID 000-008) is 8%, and the value range of the color gamut coordinates x and y of the target color (white light) is greatly reduced to 0.003 and 0.004. Fig. 6C shows the values of the individual optical parameters of each intelligent rear projection television unit 110(ID 000-008) after the overall optical correction is completed, in which the brightness value range of each intelligent rear projection television unit 110(ID 000-008) is greatly reduced to 4%, and the value range of the target color gamut coordinates x and y is maintained within the measurement error range.

From these actual data, the apparatus and method of the present invention can avoid manual adjustment of individual color uniformity, and also overcome the problem of non-uniform brightness between display devices and at different positions on the screen of an individual display, and the problem of non-uniform color and brightness of the whole video wall picture, and simultaneously achieve the purpose of automatically and timely maintaining the uniformity of color and brightness of the whole video wall picture.

While the foregoing is directed to embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow and their equivalents.

[ notation ] to show

000 first (main) intelligent rear projection television unit

001 ~ 008 second (slave) intelligent rear projection television unit

10/20 Intelligent rear projection television wall

11 to 15/21 to 25/31 to 35/41 to 45/51 to 55 blocks

100/101/102 Intelligent rear projection television Unit

101R/101G/101B/102R/102G/102B/100R color gamut coordinate positions

110 projection light machine

111 light source driving device

112R/112G/112B three-color light source

113R/113G/113B color light mirror set

114 rectangular column type optical integrator

115 lens group

116 prism group

117 digital micromirror device

118 optical machine lens

121A/121R/121G/121B optical sensor

125 digital optical regulation and control module

125A central processing unit

125B uniformity regulation and control unit

125C color processing unit

130 image mirror

150 screen

200 spectrum measuring device

300 calculator

DA Integrated optical data

DR first optical measurement data

DG second optical measurement data

DB third optical measurement data

I image

Iinuput image input signal

Idigital digital image signal

L_RGBColor light intensity signal

Claims

1. A method for regulating and controlling the color and brightness uniformity of an intelligent rear projection television wall in real time, wherein the intelligent rear projection television wall is composed of a plurality of intelligent rear projection television units, each intelligent rear projection television unit comprises a projection light machine and a screen, each projection light machine is provided with an optical sensor and is configured to provide an optical sensing signal, and the method comprises the following steps:

(A) providing a spectrum measuring device for respectively obtaining a group of screen brightness and color uniformity correction values and basic color correction values of each intelligent rear projection television unit, wherein each group of screen brightness and color uniformity correction values comprises corresponding brightness and color correction values at different positions on the screen of the intelligent rear projection television unit;

(B) continuously compensating by the projector of each intelligent rear projection television unit according to the corresponding basic color correction value and the optical sensing signal to maintain the color of the intelligent rear projection television unit;

(C) selecting a first intelligent rear projection television unit from the plurality of intelligent rear projection television units, and setting the rest as a second intelligent rear projection television unit; and

(D) the projector of the first intelligent rear projection television unit transmits the optical sensing signals from the second intelligent rear projection television units to regulate and control the brightness of the second intelligent rear projection television units so as to continuously maintain the brightness uniformity of the whole screen of the intelligent rear projection television wall.

2. The method of claim 1, wherein each of the projection engines further comprises:

a digital micromirror device configured to project an image on the screen;

the three-color light source set emits a first color light, a second color light and a third color light respectively, the first color light, the second color light and the third color light are projected to the screen along a light path after being configured and combined, and the optical sensor is configured at one side of the light path;

the light source driving device is electrically connected with the group of three-color light sources; and

a digital optical modulation module, electrically connected to the optical sensor, the light source driving device, and the digital micromirror device, configured to receive an image input signal related to the image and the optical sensing signal from the optical sensor, and send a digital image signal to the digital micromirror device according to the image input signal, wherein step (B) further comprises the steps of:

(B1) the digital optical regulation and control module compensates to maintain the color of the intelligent rear projection television unit through the digital image signal according to the corresponding basic color correction value and the optical sensing signal.

3. The method of claim 2, wherein step (D) further comprises the steps of:

(D1) the digital optical regulation and control module of the first intelligent rear projection television unit instructs each digital optical regulation and control module of each second intelligent rear projection television unit to regulate and control the brightness according to each optical sensing signal from each second intelligent rear projection television unit.

4. The method according to claim 3, wherein each of the digital optical modulation modules performs brightness modulation through one of the following steps:

(D2) communicating the light source driving device to regulate the intensity of the three-color light source; and

(D3) and transmitting the digital micro reflector device to regulate and control the screen brightness of the intelligent rear projection television unit.

5. The utility model provides an intelligence back projection television wall, contains plural intelligent back projection television unit, and each this intelligence back projection television unit contains:

a screen; and

a projection light engine, comprising:

a digital micromirror device configured to project an image on the screen;

the three-color light source set respectively emits a first color light, a second color light and a third color light, and the first color light, the second color light and the third color light are projected on the screen along a light path after being configured and combined;

an optical sensor configured to obtain first optical measurement data, second optical measurement data, and third optical measurement data corresponding to the first color light, the second color light, and the third color light, respectively;

a digital optical modulation module, electrically connected to the optical sensor, the light source driving device, and the digital micromirror device, configured to receive an image input signal related to the image and the first optical measurement data, the second optical measurement data, and the third optical measurement data from the optical sensor, and send a digital image signal to the digital micromirror device according to the image input signal, wherein: the digital optical regulation and control module continuously corrects the digital image signal according to a group of screen optical uniformity default correction values corresponding to different positions on the screen of the intelligent rear projection television unit so as to maintain the brightness uniformity of individual screens of the intelligent rear projection television unit;

the digital optical regulation and control module compensates to maintain the color of the intelligent rear projection television unit through the digital image signal according to a plurality of basic color correction values corresponding to the intelligent rear projection television unit and the first optical measurement data, the second optical measurement data and the third optical measurement data;

one of the plurality of intelligent rear projection television units is defaulted as a first intelligent rear projection television unit, and the other intelligent rear projection television units are defaulted as second intelligent rear projection television units; and is

The digital optical regulation and control module in the first intelligent rear projection television unit transmits the brightness regulation and control of each digital optical regulation and control module of each second intelligent rear projection television unit according to the optical measurement data from each second intelligent rear projection television unit so as to continuously maintain the brightness uniformity of the whole screen of the intelligent rear projection television wall.

6. The intelligent rear projection television wall as claimed in claim 5, wherein the set of preset default correction values for optical uniformity of the screen are obtained by using a spectrum measurement device to measure at different positions on the screen of each of the intelligent rear projection television units respectively and independently, and estimating the set of initial color brightness data by the digital optical adjustment and control module, wherein the set of default correction values for optical uniformity of the screen includes the correction values for color brightness corresponding to the different positions on the screen.

7. The intelligent rear projection video wall of claim 5, wherein each digital optical control module performs brightness control through one of the following steps:

8. A method for real-time regulating and controlling optical parameters of an intelligent rear projection television wall, wherein the intelligent rear projection television wall is composed of a plurality of intelligent rear projection television units, and the method comprises the following steps:

selecting one of the plurality of intelligent rear projection television units as a main intelligent rear projection television unit;

making the other intelligent rear projection television units as slave intelligent rear projection television units;

detecting optical sensing signals of each intelligent rear projection television unit related to the optical parameters, wherein the optical sensing signals are obtained from each intelligent rear projection television unit; and

the main intelligent rear projection television unit collects the optical sensing signals to regulate and control the optical parameters, so that the intelligent rear projection television wall continuously maintains the uniformity on the whole screen of the intelligent rear projection television wall in terms of the optical parameters.

9. The method of claim 8, wherein each of the intelligent rear projection television units comprises a projection light engine and a screen, each of the projection light engines having an optical sensor configured to provide the optical sensor signal associated with the projection light engine, each of the projection light engines further having:

a digital micromirror device configured to project an image on the screen;

a digital optical modulation module, electrically connected to the optical sensor, the light source driving device, and the digital micromirror device, configured to receive an image input signal related to the image and an optical sensing signal from the optical sensor, and to transmit a digital image signal to the digital micromirror device according to the image input signal, the method further comprising the steps of:

each digital optical regulation and control module compensates through the digital image signal according to the corresponding basic color correction value and the optical sensing signal so as to maintain the color of the intelligent rear projection television unit.

10. The method as claimed in claim 9, wherein the digital optical control module of the master intelligent rear projection television unit communicates the digital optical control modules of the slave intelligent rear projection television units to perform brightness control according to the optical sensing signals from the slave intelligent rear projection television units.